Loading...
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * linux/drivers/mmc/host/sdhci.c - Secure Digital Host Controller Interface driver
4 *
5 * Copyright (C) 2005-2008 Pierre Ossman, All Rights Reserved.
6 *
7 * Thanks to the following companies for their support:
8 *
9 * - JMicron (hardware and technical support)
10 */
11
12#include <linux/bitfield.h>
13#include <linux/delay.h>
14#include <linux/dmaengine.h>
15#include <linux/ktime.h>
16#include <linux/highmem.h>
17#include <linux/io.h>
18#include <linux/module.h>
19#include <linux/dma-mapping.h>
20#include <linux/slab.h>
21#include <linux/scatterlist.h>
22#include <linux/sizes.h>
23#include <linux/regulator/consumer.h>
24#include <linux/pm_runtime.h>
25#include <linux/of.h>
26
27#include <linux/leds.h>
28
29#include <linux/mmc/mmc.h>
30#include <linux/mmc/host.h>
31#include <linux/mmc/card.h>
32#include <linux/mmc/sdio.h>
33#include <linux/mmc/slot-gpio.h>
34
35#include "sdhci.h"
36
37#define DRIVER_NAME "sdhci"
38
39#define DBG(f, x...) \
40 pr_debug("%s: " DRIVER_NAME ": " f, mmc_hostname(host->mmc), ## x)
41
42#define SDHCI_DUMP(f, x...) \
43 pr_err("%s: " DRIVER_NAME ": " f, mmc_hostname(host->mmc), ## x)
44
45#define MAX_TUNING_LOOP 40
46
47static unsigned int debug_quirks = 0;
48static unsigned int debug_quirks2;
49
50static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable);
51
52static bool sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd);
53
54void sdhci_dumpregs(struct sdhci_host *host)
55{
56 SDHCI_DUMP("============ SDHCI REGISTER DUMP ===========\n");
57
58 SDHCI_DUMP("Sys addr: 0x%08x | Version: 0x%08x\n",
59 sdhci_readl(host, SDHCI_DMA_ADDRESS),
60 sdhci_readw(host, SDHCI_HOST_VERSION));
61 SDHCI_DUMP("Blk size: 0x%08x | Blk cnt: 0x%08x\n",
62 sdhci_readw(host, SDHCI_BLOCK_SIZE),
63 sdhci_readw(host, SDHCI_BLOCK_COUNT));
64 SDHCI_DUMP("Argument: 0x%08x | Trn mode: 0x%08x\n",
65 sdhci_readl(host, SDHCI_ARGUMENT),
66 sdhci_readw(host, SDHCI_TRANSFER_MODE));
67 SDHCI_DUMP("Present: 0x%08x | Host ctl: 0x%08x\n",
68 sdhci_readl(host, SDHCI_PRESENT_STATE),
69 sdhci_readb(host, SDHCI_HOST_CONTROL));
70 SDHCI_DUMP("Power: 0x%08x | Blk gap: 0x%08x\n",
71 sdhci_readb(host, SDHCI_POWER_CONTROL),
72 sdhci_readb(host, SDHCI_BLOCK_GAP_CONTROL));
73 SDHCI_DUMP("Wake-up: 0x%08x | Clock: 0x%08x\n",
74 sdhci_readb(host, SDHCI_WAKE_UP_CONTROL),
75 sdhci_readw(host, SDHCI_CLOCK_CONTROL));
76 SDHCI_DUMP("Timeout: 0x%08x | Int stat: 0x%08x\n",
77 sdhci_readb(host, SDHCI_TIMEOUT_CONTROL),
78 sdhci_readl(host, SDHCI_INT_STATUS));
79 SDHCI_DUMP("Int enab: 0x%08x | Sig enab: 0x%08x\n",
80 sdhci_readl(host, SDHCI_INT_ENABLE),
81 sdhci_readl(host, SDHCI_SIGNAL_ENABLE));
82 SDHCI_DUMP("ACmd stat: 0x%08x | Slot int: 0x%08x\n",
83 sdhci_readw(host, SDHCI_AUTO_CMD_STATUS),
84 sdhci_readw(host, SDHCI_SLOT_INT_STATUS));
85 SDHCI_DUMP("Caps: 0x%08x | Caps_1: 0x%08x\n",
86 sdhci_readl(host, SDHCI_CAPABILITIES),
87 sdhci_readl(host, SDHCI_CAPABILITIES_1));
88 SDHCI_DUMP("Cmd: 0x%08x | Max curr: 0x%08x\n",
89 sdhci_readw(host, SDHCI_COMMAND),
90 sdhci_readl(host, SDHCI_MAX_CURRENT));
91 SDHCI_DUMP("Resp[0]: 0x%08x | Resp[1]: 0x%08x\n",
92 sdhci_readl(host, SDHCI_RESPONSE),
93 sdhci_readl(host, SDHCI_RESPONSE + 4));
94 SDHCI_DUMP("Resp[2]: 0x%08x | Resp[3]: 0x%08x\n",
95 sdhci_readl(host, SDHCI_RESPONSE + 8),
96 sdhci_readl(host, SDHCI_RESPONSE + 12));
97 SDHCI_DUMP("Host ctl2: 0x%08x\n",
98 sdhci_readw(host, SDHCI_HOST_CONTROL2));
99
100 if (host->flags & SDHCI_USE_ADMA) {
101 if (host->flags & SDHCI_USE_64_BIT_DMA) {
102 SDHCI_DUMP("ADMA Err: 0x%08x | ADMA Ptr: 0x%08x%08x\n",
103 sdhci_readl(host, SDHCI_ADMA_ERROR),
104 sdhci_readl(host, SDHCI_ADMA_ADDRESS_HI),
105 sdhci_readl(host, SDHCI_ADMA_ADDRESS));
106 } else {
107 SDHCI_DUMP("ADMA Err: 0x%08x | ADMA Ptr: 0x%08x\n",
108 sdhci_readl(host, SDHCI_ADMA_ERROR),
109 sdhci_readl(host, SDHCI_ADMA_ADDRESS));
110 }
111 }
112
113 if (host->ops->dump_vendor_regs)
114 host->ops->dump_vendor_regs(host);
115
116 SDHCI_DUMP("============================================\n");
117}
118EXPORT_SYMBOL_GPL(sdhci_dumpregs);
119
120/*****************************************************************************\
121 * *
122 * Low level functions *
123 * *
124\*****************************************************************************/
125
126static void sdhci_do_enable_v4_mode(struct sdhci_host *host)
127{
128 u16 ctrl2;
129
130 ctrl2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
131 if (ctrl2 & SDHCI_CTRL_V4_MODE)
132 return;
133
134 ctrl2 |= SDHCI_CTRL_V4_MODE;
135 sdhci_writew(host, ctrl2, SDHCI_HOST_CONTROL2);
136}
137
138/*
139 * This can be called before sdhci_add_host() by Vendor's host controller
140 * driver to enable v4 mode if supported.
141 */
142void sdhci_enable_v4_mode(struct sdhci_host *host)
143{
144 host->v4_mode = true;
145 sdhci_do_enable_v4_mode(host);
146}
147EXPORT_SYMBOL_GPL(sdhci_enable_v4_mode);
148
149static inline bool sdhci_data_line_cmd(struct mmc_command *cmd)
150{
151 return cmd->data || cmd->flags & MMC_RSP_BUSY;
152}
153
154static void sdhci_set_card_detection(struct sdhci_host *host, bool enable)
155{
156 u32 present;
157
158 if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) ||
159 !mmc_card_is_removable(host->mmc) || mmc_can_gpio_cd(host->mmc))
160 return;
161
162 if (enable) {
163 present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
164 SDHCI_CARD_PRESENT;
165
166 host->ier |= present ? SDHCI_INT_CARD_REMOVE :
167 SDHCI_INT_CARD_INSERT;
168 } else {
169 host->ier &= ~(SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT);
170 }
171
172 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
173 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
174}
175
176static void sdhci_enable_card_detection(struct sdhci_host *host)
177{
178 sdhci_set_card_detection(host, true);
179}
180
181static void sdhci_disable_card_detection(struct sdhci_host *host)
182{
183 sdhci_set_card_detection(host, false);
184}
185
186static void sdhci_runtime_pm_bus_on(struct sdhci_host *host)
187{
188 if (host->bus_on)
189 return;
190 host->bus_on = true;
191 pm_runtime_get_noresume(mmc_dev(host->mmc));
192}
193
194static void sdhci_runtime_pm_bus_off(struct sdhci_host *host)
195{
196 if (!host->bus_on)
197 return;
198 host->bus_on = false;
199 pm_runtime_put_noidle(mmc_dev(host->mmc));
200}
201
202void sdhci_reset(struct sdhci_host *host, u8 mask)
203{
204 ktime_t timeout;
205
206 sdhci_writeb(host, mask, SDHCI_SOFTWARE_RESET);
207
208 if (mask & SDHCI_RESET_ALL) {
209 host->clock = 0;
210 /* Reset-all turns off SD Bus Power */
211 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
212 sdhci_runtime_pm_bus_off(host);
213 }
214
215 /* Wait max 100 ms */
216 timeout = ktime_add_ms(ktime_get(), 100);
217
218 /* hw clears the bit when it's done */
219 while (1) {
220 bool timedout = ktime_after(ktime_get(), timeout);
221
222 if (!(sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask))
223 break;
224 if (timedout) {
225 pr_err("%s: Reset 0x%x never completed.\n",
226 mmc_hostname(host->mmc), (int)mask);
227 sdhci_err_stats_inc(host, CTRL_TIMEOUT);
228 sdhci_dumpregs(host);
229 return;
230 }
231 udelay(10);
232 }
233}
234EXPORT_SYMBOL_GPL(sdhci_reset);
235
236static bool sdhci_do_reset(struct sdhci_host *host, u8 mask)
237{
238 if (host->quirks & SDHCI_QUIRK_NO_CARD_NO_RESET) {
239 struct mmc_host *mmc = host->mmc;
240
241 if (!mmc->ops->get_cd(mmc))
242 return false;
243 }
244
245 host->ops->reset(host, mask);
246
247 return true;
248}
249
250static void sdhci_reset_for_all(struct sdhci_host *host)
251{
252 if (sdhci_do_reset(host, SDHCI_RESET_ALL)) {
253 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
254 if (host->ops->enable_dma)
255 host->ops->enable_dma(host);
256 }
257 /* Resetting the controller clears many */
258 host->preset_enabled = false;
259 }
260}
261
262enum sdhci_reset_reason {
263 SDHCI_RESET_FOR_INIT,
264 SDHCI_RESET_FOR_REQUEST_ERROR,
265 SDHCI_RESET_FOR_REQUEST_ERROR_DATA_ONLY,
266 SDHCI_RESET_FOR_TUNING_ABORT,
267 SDHCI_RESET_FOR_CARD_REMOVED,
268 SDHCI_RESET_FOR_CQE_RECOVERY,
269};
270
271static void sdhci_reset_for_reason(struct sdhci_host *host, enum sdhci_reset_reason reason)
272{
273 if (host->quirks2 & SDHCI_QUIRK2_ISSUE_CMD_DAT_RESET_TOGETHER) {
274 sdhci_do_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
275 return;
276 }
277
278 switch (reason) {
279 case SDHCI_RESET_FOR_INIT:
280 sdhci_do_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
281 break;
282 case SDHCI_RESET_FOR_REQUEST_ERROR:
283 case SDHCI_RESET_FOR_TUNING_ABORT:
284 case SDHCI_RESET_FOR_CARD_REMOVED:
285 case SDHCI_RESET_FOR_CQE_RECOVERY:
286 sdhci_do_reset(host, SDHCI_RESET_CMD);
287 sdhci_do_reset(host, SDHCI_RESET_DATA);
288 break;
289 case SDHCI_RESET_FOR_REQUEST_ERROR_DATA_ONLY:
290 sdhci_do_reset(host, SDHCI_RESET_DATA);
291 break;
292 }
293}
294
295#define sdhci_reset_for(h, r) sdhci_reset_for_reason((h), SDHCI_RESET_FOR_##r)
296
297static void sdhci_set_default_irqs(struct sdhci_host *host)
298{
299 host->ier = SDHCI_INT_BUS_POWER | SDHCI_INT_DATA_END_BIT |
300 SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_TIMEOUT |
301 SDHCI_INT_INDEX | SDHCI_INT_END_BIT | SDHCI_INT_CRC |
302 SDHCI_INT_TIMEOUT | SDHCI_INT_DATA_END |
303 SDHCI_INT_RESPONSE;
304
305 if (host->tuning_mode == SDHCI_TUNING_MODE_2 ||
306 host->tuning_mode == SDHCI_TUNING_MODE_3)
307 host->ier |= SDHCI_INT_RETUNE;
308
309 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
310 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
311}
312
313static void sdhci_config_dma(struct sdhci_host *host)
314{
315 u8 ctrl;
316 u16 ctrl2;
317
318 if (host->version < SDHCI_SPEC_200)
319 return;
320
321 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
322
323 /*
324 * Always adjust the DMA selection as some controllers
325 * (e.g. JMicron) can't do PIO properly when the selection
326 * is ADMA.
327 */
328 ctrl &= ~SDHCI_CTRL_DMA_MASK;
329 if (!(host->flags & SDHCI_REQ_USE_DMA))
330 goto out;
331
332 /* Note if DMA Select is zero then SDMA is selected */
333 if (host->flags & SDHCI_USE_ADMA)
334 ctrl |= SDHCI_CTRL_ADMA32;
335
336 if (host->flags & SDHCI_USE_64_BIT_DMA) {
337 /*
338 * If v4 mode, all supported DMA can be 64-bit addressing if
339 * controller supports 64-bit system address, otherwise only
340 * ADMA can support 64-bit addressing.
341 */
342 if (host->v4_mode) {
343 ctrl2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
344 ctrl2 |= SDHCI_CTRL_64BIT_ADDR;
345 sdhci_writew(host, ctrl2, SDHCI_HOST_CONTROL2);
346 } else if (host->flags & SDHCI_USE_ADMA) {
347 /*
348 * Don't need to undo SDHCI_CTRL_ADMA32 in order to
349 * set SDHCI_CTRL_ADMA64.
350 */
351 ctrl |= SDHCI_CTRL_ADMA64;
352 }
353 }
354
355out:
356 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
357}
358
359static void sdhci_init(struct sdhci_host *host, int soft)
360{
361 struct mmc_host *mmc = host->mmc;
362 unsigned long flags;
363
364 if (soft)
365 sdhci_reset_for(host, INIT);
366 else
367 sdhci_reset_for_all(host);
368
369 if (host->v4_mode)
370 sdhci_do_enable_v4_mode(host);
371
372 spin_lock_irqsave(&host->lock, flags);
373 sdhci_set_default_irqs(host);
374 spin_unlock_irqrestore(&host->lock, flags);
375
376 host->cqe_on = false;
377
378 if (soft) {
379 /* force clock reconfiguration */
380 host->clock = 0;
381 host->reinit_uhs = true;
382 mmc->ops->set_ios(mmc, &mmc->ios);
383 }
384}
385
386static void sdhci_reinit(struct sdhci_host *host)
387{
388 u32 cd = host->ier & (SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT);
389
390 sdhci_init(host, 0);
391 sdhci_enable_card_detection(host);
392
393 /*
394 * A change to the card detect bits indicates a change in present state,
395 * refer sdhci_set_card_detection(). A card detect interrupt might have
396 * been missed while the host controller was being reset, so trigger a
397 * rescan to check.
398 */
399 if (cd != (host->ier & (SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT)))
400 mmc_detect_change(host->mmc, msecs_to_jiffies(200));
401}
402
403static void __sdhci_led_activate(struct sdhci_host *host)
404{
405 u8 ctrl;
406
407 if (host->quirks & SDHCI_QUIRK_NO_LED)
408 return;
409
410 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
411 ctrl |= SDHCI_CTRL_LED;
412 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
413}
414
415static void __sdhci_led_deactivate(struct sdhci_host *host)
416{
417 u8 ctrl;
418
419 if (host->quirks & SDHCI_QUIRK_NO_LED)
420 return;
421
422 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
423 ctrl &= ~SDHCI_CTRL_LED;
424 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
425}
426
427#if IS_REACHABLE(CONFIG_LEDS_CLASS)
428static void sdhci_led_control(struct led_classdev *led,
429 enum led_brightness brightness)
430{
431 struct sdhci_host *host = container_of(led, struct sdhci_host, led);
432 unsigned long flags;
433
434 spin_lock_irqsave(&host->lock, flags);
435
436 if (host->runtime_suspended)
437 goto out;
438
439 if (brightness == LED_OFF)
440 __sdhci_led_deactivate(host);
441 else
442 __sdhci_led_activate(host);
443out:
444 spin_unlock_irqrestore(&host->lock, flags);
445}
446
447static int sdhci_led_register(struct sdhci_host *host)
448{
449 struct mmc_host *mmc = host->mmc;
450
451 if (host->quirks & SDHCI_QUIRK_NO_LED)
452 return 0;
453
454 snprintf(host->led_name, sizeof(host->led_name),
455 "%s::", mmc_hostname(mmc));
456
457 host->led.name = host->led_name;
458 host->led.brightness = LED_OFF;
459 host->led.default_trigger = mmc_hostname(mmc);
460 host->led.brightness_set = sdhci_led_control;
461
462 return led_classdev_register(mmc_dev(mmc), &host->led);
463}
464
465static void sdhci_led_unregister(struct sdhci_host *host)
466{
467 if (host->quirks & SDHCI_QUIRK_NO_LED)
468 return;
469
470 led_classdev_unregister(&host->led);
471}
472
473static inline void sdhci_led_activate(struct sdhci_host *host)
474{
475}
476
477static inline void sdhci_led_deactivate(struct sdhci_host *host)
478{
479}
480
481#else
482
483static inline int sdhci_led_register(struct sdhci_host *host)
484{
485 return 0;
486}
487
488static inline void sdhci_led_unregister(struct sdhci_host *host)
489{
490}
491
492static inline void sdhci_led_activate(struct sdhci_host *host)
493{
494 __sdhci_led_activate(host);
495}
496
497static inline void sdhci_led_deactivate(struct sdhci_host *host)
498{
499 __sdhci_led_deactivate(host);
500}
501
502#endif
503
504static void sdhci_mod_timer(struct sdhci_host *host, struct mmc_request *mrq,
505 unsigned long timeout)
506{
507 if (sdhci_data_line_cmd(mrq->cmd))
508 mod_timer(&host->data_timer, timeout);
509 else
510 mod_timer(&host->timer, timeout);
511}
512
513static void sdhci_del_timer(struct sdhci_host *host, struct mmc_request *mrq)
514{
515 if (sdhci_data_line_cmd(mrq->cmd))
516 del_timer(&host->data_timer);
517 else
518 del_timer(&host->timer);
519}
520
521static inline bool sdhci_has_requests(struct sdhci_host *host)
522{
523 return host->cmd || host->data_cmd;
524}
525
526/*****************************************************************************\
527 * *
528 * Core functions *
529 * *
530\*****************************************************************************/
531
532static void sdhci_read_block_pio(struct sdhci_host *host)
533{
534 size_t blksize, len, chunk;
535 u32 scratch;
536 u8 *buf;
537
538 DBG("PIO reading\n");
539
540 blksize = host->data->blksz;
541 chunk = 0;
542
543 while (blksize) {
544 BUG_ON(!sg_miter_next(&host->sg_miter));
545
546 len = min(host->sg_miter.length, blksize);
547
548 blksize -= len;
549 host->sg_miter.consumed = len;
550
551 buf = host->sg_miter.addr;
552
553 while (len) {
554 if (chunk == 0) {
555 scratch = sdhci_readl(host, SDHCI_BUFFER);
556 chunk = 4;
557 }
558
559 *buf = scratch & 0xFF;
560
561 buf++;
562 scratch >>= 8;
563 chunk--;
564 len--;
565 }
566 }
567
568 sg_miter_stop(&host->sg_miter);
569}
570
571static void sdhci_write_block_pio(struct sdhci_host *host)
572{
573 size_t blksize, len, chunk;
574 u32 scratch;
575 u8 *buf;
576
577 DBG("PIO writing\n");
578
579 blksize = host->data->blksz;
580 chunk = 0;
581 scratch = 0;
582
583 while (blksize) {
584 BUG_ON(!sg_miter_next(&host->sg_miter));
585
586 len = min(host->sg_miter.length, blksize);
587
588 blksize -= len;
589 host->sg_miter.consumed = len;
590
591 buf = host->sg_miter.addr;
592
593 while (len) {
594 scratch |= (u32)*buf << (chunk * 8);
595
596 buf++;
597 chunk++;
598 len--;
599
600 if ((chunk == 4) || ((len == 0) && (blksize == 0))) {
601 sdhci_writel(host, scratch, SDHCI_BUFFER);
602 chunk = 0;
603 scratch = 0;
604 }
605 }
606 }
607
608 sg_miter_stop(&host->sg_miter);
609}
610
611static void sdhci_transfer_pio(struct sdhci_host *host)
612{
613 u32 mask;
614
615 if (host->blocks == 0)
616 return;
617
618 if (host->data->flags & MMC_DATA_READ)
619 mask = SDHCI_DATA_AVAILABLE;
620 else
621 mask = SDHCI_SPACE_AVAILABLE;
622
623 /*
624 * Some controllers (JMicron JMB38x) mess up the buffer bits
625 * for transfers < 4 bytes. As long as it is just one block,
626 * we can ignore the bits.
627 */
628 if ((host->quirks & SDHCI_QUIRK_BROKEN_SMALL_PIO) &&
629 (host->data->blocks == 1))
630 mask = ~0;
631
632 while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) {
633 if (host->quirks & SDHCI_QUIRK_PIO_NEEDS_DELAY)
634 udelay(100);
635
636 if (host->data->flags & MMC_DATA_READ)
637 sdhci_read_block_pio(host);
638 else
639 sdhci_write_block_pio(host);
640
641 host->blocks--;
642 if (host->blocks == 0)
643 break;
644 }
645
646 DBG("PIO transfer complete.\n");
647}
648
649static int sdhci_pre_dma_transfer(struct sdhci_host *host,
650 struct mmc_data *data, int cookie)
651{
652 int sg_count;
653
654 /*
655 * If the data buffers are already mapped, return the previous
656 * dma_map_sg() result.
657 */
658 if (data->host_cookie == COOKIE_PRE_MAPPED)
659 return data->sg_count;
660
661 /* Bounce write requests to the bounce buffer */
662 if (host->bounce_buffer) {
663 unsigned int length = data->blksz * data->blocks;
664
665 if (length > host->bounce_buffer_size) {
666 pr_err("%s: asked for transfer of %u bytes exceeds bounce buffer %u bytes\n",
667 mmc_hostname(host->mmc), length,
668 host->bounce_buffer_size);
669 return -EIO;
670 }
671 if (mmc_get_dma_dir(data) == DMA_TO_DEVICE) {
672 /* Copy the data to the bounce buffer */
673 if (host->ops->copy_to_bounce_buffer) {
674 host->ops->copy_to_bounce_buffer(host,
675 data, length);
676 } else {
677 sg_copy_to_buffer(data->sg, data->sg_len,
678 host->bounce_buffer, length);
679 }
680 }
681 /* Switch ownership to the DMA */
682 dma_sync_single_for_device(mmc_dev(host->mmc),
683 host->bounce_addr,
684 host->bounce_buffer_size,
685 mmc_get_dma_dir(data));
686 /* Just a dummy value */
687 sg_count = 1;
688 } else {
689 /* Just access the data directly from memory */
690 sg_count = dma_map_sg(mmc_dev(host->mmc),
691 data->sg, data->sg_len,
692 mmc_get_dma_dir(data));
693 }
694
695 if (sg_count == 0)
696 return -ENOSPC;
697
698 data->sg_count = sg_count;
699 data->host_cookie = cookie;
700
701 return sg_count;
702}
703
704static char *sdhci_kmap_atomic(struct scatterlist *sg)
705{
706 return kmap_local_page(sg_page(sg)) + sg->offset;
707}
708
709static void sdhci_kunmap_atomic(void *buffer)
710{
711 kunmap_local(buffer);
712}
713
714void sdhci_adma_write_desc(struct sdhci_host *host, void **desc,
715 dma_addr_t addr, int len, unsigned int cmd)
716{
717 struct sdhci_adma2_64_desc *dma_desc = *desc;
718
719 /* 32-bit and 64-bit descriptors have these members in same position */
720 dma_desc->cmd = cpu_to_le16(cmd);
721 dma_desc->len = cpu_to_le16(len);
722 dma_desc->addr_lo = cpu_to_le32(lower_32_bits(addr));
723
724 if (host->flags & SDHCI_USE_64_BIT_DMA)
725 dma_desc->addr_hi = cpu_to_le32(upper_32_bits(addr));
726
727 *desc += host->desc_sz;
728}
729EXPORT_SYMBOL_GPL(sdhci_adma_write_desc);
730
731static inline void __sdhci_adma_write_desc(struct sdhci_host *host,
732 void **desc, dma_addr_t addr,
733 int len, unsigned int cmd)
734{
735 if (host->ops->adma_write_desc)
736 host->ops->adma_write_desc(host, desc, addr, len, cmd);
737 else
738 sdhci_adma_write_desc(host, desc, addr, len, cmd);
739}
740
741static void sdhci_adma_mark_end(void *desc)
742{
743 struct sdhci_adma2_64_desc *dma_desc = desc;
744
745 /* 32-bit and 64-bit descriptors have 'cmd' in same position */
746 dma_desc->cmd |= cpu_to_le16(ADMA2_END);
747}
748
749static void sdhci_adma_table_pre(struct sdhci_host *host,
750 struct mmc_data *data, int sg_count)
751{
752 struct scatterlist *sg;
753 dma_addr_t addr, align_addr;
754 void *desc, *align;
755 char *buffer;
756 int len, offset, i;
757
758 /*
759 * The spec does not specify endianness of descriptor table.
760 * We currently guess that it is LE.
761 */
762
763 host->sg_count = sg_count;
764
765 desc = host->adma_table;
766 align = host->align_buffer;
767
768 align_addr = host->align_addr;
769
770 for_each_sg(data->sg, sg, host->sg_count, i) {
771 addr = sg_dma_address(sg);
772 len = sg_dma_len(sg);
773
774 /*
775 * The SDHCI specification states that ADMA addresses must
776 * be 32-bit aligned. If they aren't, then we use a bounce
777 * buffer for the (up to three) bytes that screw up the
778 * alignment.
779 */
780 offset = (SDHCI_ADMA2_ALIGN - (addr & SDHCI_ADMA2_MASK)) &
781 SDHCI_ADMA2_MASK;
782 if (offset) {
783 if (data->flags & MMC_DATA_WRITE) {
784 buffer = sdhci_kmap_atomic(sg);
785 memcpy(align, buffer, offset);
786 sdhci_kunmap_atomic(buffer);
787 }
788
789 /* tran, valid */
790 __sdhci_adma_write_desc(host, &desc, align_addr,
791 offset, ADMA2_TRAN_VALID);
792
793 BUG_ON(offset > 65536);
794
795 align += SDHCI_ADMA2_ALIGN;
796 align_addr += SDHCI_ADMA2_ALIGN;
797
798 addr += offset;
799 len -= offset;
800 }
801
802 /*
803 * The block layer forces a minimum segment size of PAGE_SIZE,
804 * so 'len' can be too big here if PAGE_SIZE >= 64KiB. Write
805 * multiple descriptors, noting that the ADMA table is sized
806 * for 4KiB chunks anyway, so it will be big enough.
807 */
808 while (len > host->max_adma) {
809 int n = 32 * 1024; /* 32KiB*/
810
811 __sdhci_adma_write_desc(host, &desc, addr, n, ADMA2_TRAN_VALID);
812 addr += n;
813 len -= n;
814 }
815
816 /* tran, valid */
817 if (len)
818 __sdhci_adma_write_desc(host, &desc, addr, len,
819 ADMA2_TRAN_VALID);
820
821 /*
822 * If this triggers then we have a calculation bug
823 * somewhere. :/
824 */
825 WARN_ON((desc - host->adma_table) >= host->adma_table_sz);
826 }
827
828 if (host->quirks & SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC) {
829 /* Mark the last descriptor as the terminating descriptor */
830 if (desc != host->adma_table) {
831 desc -= host->desc_sz;
832 sdhci_adma_mark_end(desc);
833 }
834 } else {
835 /* Add a terminating entry - nop, end, valid */
836 __sdhci_adma_write_desc(host, &desc, 0, 0, ADMA2_NOP_END_VALID);
837 }
838}
839
840static void sdhci_adma_table_post(struct sdhci_host *host,
841 struct mmc_data *data)
842{
843 struct scatterlist *sg;
844 int i, size;
845 void *align;
846 char *buffer;
847
848 if (data->flags & MMC_DATA_READ) {
849 bool has_unaligned = false;
850
851 /* Do a quick scan of the SG list for any unaligned mappings */
852 for_each_sg(data->sg, sg, host->sg_count, i)
853 if (sg_dma_address(sg) & SDHCI_ADMA2_MASK) {
854 has_unaligned = true;
855 break;
856 }
857
858 if (has_unaligned) {
859 dma_sync_sg_for_cpu(mmc_dev(host->mmc), data->sg,
860 data->sg_len, DMA_FROM_DEVICE);
861
862 align = host->align_buffer;
863
864 for_each_sg(data->sg, sg, host->sg_count, i) {
865 if (sg_dma_address(sg) & SDHCI_ADMA2_MASK) {
866 size = SDHCI_ADMA2_ALIGN -
867 (sg_dma_address(sg) & SDHCI_ADMA2_MASK);
868
869 buffer = sdhci_kmap_atomic(sg);
870 memcpy(buffer, align, size);
871 sdhci_kunmap_atomic(buffer);
872
873 align += SDHCI_ADMA2_ALIGN;
874 }
875 }
876 }
877 }
878}
879
880static void sdhci_set_adma_addr(struct sdhci_host *host, dma_addr_t addr)
881{
882 sdhci_writel(host, lower_32_bits(addr), SDHCI_ADMA_ADDRESS);
883 if (host->flags & SDHCI_USE_64_BIT_DMA)
884 sdhci_writel(host, upper_32_bits(addr), SDHCI_ADMA_ADDRESS_HI);
885}
886
887static dma_addr_t sdhci_sdma_address(struct sdhci_host *host)
888{
889 if (host->bounce_buffer)
890 return host->bounce_addr;
891 else
892 return sg_dma_address(host->data->sg);
893}
894
895static void sdhci_set_sdma_addr(struct sdhci_host *host, dma_addr_t addr)
896{
897 if (host->v4_mode)
898 sdhci_set_adma_addr(host, addr);
899 else
900 sdhci_writel(host, addr, SDHCI_DMA_ADDRESS);
901}
902
903static unsigned int sdhci_target_timeout(struct sdhci_host *host,
904 struct mmc_command *cmd,
905 struct mmc_data *data)
906{
907 unsigned int target_timeout;
908
909 /* timeout in us */
910 if (!data) {
911 target_timeout = cmd->busy_timeout * 1000;
912 } else {
913 target_timeout = DIV_ROUND_UP(data->timeout_ns, 1000);
914 if (host->clock && data->timeout_clks) {
915 unsigned long long val;
916
917 /*
918 * data->timeout_clks is in units of clock cycles.
919 * host->clock is in Hz. target_timeout is in us.
920 * Hence, us = 1000000 * cycles / Hz. Round up.
921 */
922 val = 1000000ULL * data->timeout_clks;
923 if (do_div(val, host->clock))
924 target_timeout++;
925 target_timeout += val;
926 }
927 }
928
929 return target_timeout;
930}
931
932static void sdhci_calc_sw_timeout(struct sdhci_host *host,
933 struct mmc_command *cmd)
934{
935 struct mmc_data *data = cmd->data;
936 struct mmc_host *mmc = host->mmc;
937 struct mmc_ios *ios = &mmc->ios;
938 unsigned char bus_width = 1 << ios->bus_width;
939 unsigned int blksz;
940 unsigned int freq;
941 u64 target_timeout;
942 u64 transfer_time;
943
944 target_timeout = sdhci_target_timeout(host, cmd, data);
945 target_timeout *= NSEC_PER_USEC;
946
947 if (data) {
948 blksz = data->blksz;
949 freq = mmc->actual_clock ? : host->clock;
950 transfer_time = (u64)blksz * NSEC_PER_SEC * (8 / bus_width);
951 do_div(transfer_time, freq);
952 /* multiply by '2' to account for any unknowns */
953 transfer_time = transfer_time * 2;
954 /* calculate timeout for the entire data */
955 host->data_timeout = data->blocks * target_timeout +
956 transfer_time;
957 } else {
958 host->data_timeout = target_timeout;
959 }
960
961 if (host->data_timeout)
962 host->data_timeout += MMC_CMD_TRANSFER_TIME;
963}
964
965static u8 sdhci_calc_timeout(struct sdhci_host *host, struct mmc_command *cmd,
966 bool *too_big)
967{
968 u8 count;
969 struct mmc_data *data;
970 unsigned target_timeout, current_timeout;
971
972 *too_big = false;
973
974 /*
975 * If the host controller provides us with an incorrect timeout
976 * value, just skip the check and use the maximum. The hardware may take
977 * longer to time out, but that's much better than having a too-short
978 * timeout value.
979 */
980 if (host->quirks & SDHCI_QUIRK_BROKEN_TIMEOUT_VAL)
981 return host->max_timeout_count;
982
983 /* Unspecified command, assume max */
984 if (cmd == NULL)
985 return host->max_timeout_count;
986
987 data = cmd->data;
988 /* Unspecified timeout, assume max */
989 if (!data && !cmd->busy_timeout)
990 return host->max_timeout_count;
991
992 /* timeout in us */
993 target_timeout = sdhci_target_timeout(host, cmd, data);
994
995 /*
996 * Figure out needed cycles.
997 * We do this in steps in order to fit inside a 32 bit int.
998 * The first step is the minimum timeout, which will have a
999 * minimum resolution of 6 bits:
1000 * (1) 2^13*1000 > 2^22,
1001 * (2) host->timeout_clk < 2^16
1002 * =>
1003 * (1) / (2) > 2^6
1004 */
1005 count = 0;
1006 current_timeout = (1 << 13) * 1000 / host->timeout_clk;
1007 while (current_timeout < target_timeout) {
1008 count++;
1009 current_timeout <<= 1;
1010 if (count > host->max_timeout_count) {
1011 if (!(host->quirks2 & SDHCI_QUIRK2_DISABLE_HW_TIMEOUT))
1012 DBG("Too large timeout 0x%x requested for CMD%d!\n",
1013 count, cmd->opcode);
1014 count = host->max_timeout_count;
1015 *too_big = true;
1016 break;
1017 }
1018 }
1019
1020 return count;
1021}
1022
1023static void sdhci_set_transfer_irqs(struct sdhci_host *host)
1024{
1025 u32 pio_irqs = SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL;
1026 u32 dma_irqs = SDHCI_INT_DMA_END | SDHCI_INT_ADMA_ERROR;
1027
1028 if (host->flags & SDHCI_REQ_USE_DMA)
1029 host->ier = (host->ier & ~pio_irqs) | dma_irqs;
1030 else
1031 host->ier = (host->ier & ~dma_irqs) | pio_irqs;
1032
1033 if (host->flags & (SDHCI_AUTO_CMD23 | SDHCI_AUTO_CMD12))
1034 host->ier |= SDHCI_INT_AUTO_CMD_ERR;
1035 else
1036 host->ier &= ~SDHCI_INT_AUTO_CMD_ERR;
1037
1038 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
1039 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
1040}
1041
1042void sdhci_set_data_timeout_irq(struct sdhci_host *host, bool enable)
1043{
1044 if (enable)
1045 host->ier |= SDHCI_INT_DATA_TIMEOUT;
1046 else
1047 host->ier &= ~SDHCI_INT_DATA_TIMEOUT;
1048 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
1049 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
1050}
1051EXPORT_SYMBOL_GPL(sdhci_set_data_timeout_irq);
1052
1053void __sdhci_set_timeout(struct sdhci_host *host, struct mmc_command *cmd)
1054{
1055 bool too_big = false;
1056 u8 count = sdhci_calc_timeout(host, cmd, &too_big);
1057
1058 if (too_big &&
1059 host->quirks2 & SDHCI_QUIRK2_DISABLE_HW_TIMEOUT) {
1060 sdhci_calc_sw_timeout(host, cmd);
1061 sdhci_set_data_timeout_irq(host, false);
1062 } else if (!(host->ier & SDHCI_INT_DATA_TIMEOUT)) {
1063 sdhci_set_data_timeout_irq(host, true);
1064 }
1065
1066 sdhci_writeb(host, count, SDHCI_TIMEOUT_CONTROL);
1067}
1068EXPORT_SYMBOL_GPL(__sdhci_set_timeout);
1069
1070static void sdhci_set_timeout(struct sdhci_host *host, struct mmc_command *cmd)
1071{
1072 if (host->ops->set_timeout)
1073 host->ops->set_timeout(host, cmd);
1074 else
1075 __sdhci_set_timeout(host, cmd);
1076}
1077
1078static void sdhci_initialize_data(struct sdhci_host *host,
1079 struct mmc_data *data)
1080{
1081 WARN_ON(host->data);
1082
1083 /* Sanity checks */
1084 BUG_ON(data->blksz * data->blocks > 524288);
1085 BUG_ON(data->blksz > host->mmc->max_blk_size);
1086 BUG_ON(data->blocks > 65535);
1087
1088 host->data = data;
1089 host->data_early = 0;
1090 host->data->bytes_xfered = 0;
1091}
1092
1093static inline void sdhci_set_block_info(struct sdhci_host *host,
1094 struct mmc_data *data)
1095{
1096 /* Set the DMA boundary value and block size */
1097 sdhci_writew(host,
1098 SDHCI_MAKE_BLKSZ(host->sdma_boundary, data->blksz),
1099 SDHCI_BLOCK_SIZE);
1100 /*
1101 * For Version 4.10 onwards, if v4 mode is enabled, 32-bit Block Count
1102 * can be supported, in that case 16-bit block count register must be 0.
1103 */
1104 if (host->version >= SDHCI_SPEC_410 && host->v4_mode &&
1105 (host->quirks2 & SDHCI_QUIRK2_USE_32BIT_BLK_CNT)) {
1106 if (sdhci_readw(host, SDHCI_BLOCK_COUNT))
1107 sdhci_writew(host, 0, SDHCI_BLOCK_COUNT);
1108 sdhci_writew(host, data->blocks, SDHCI_32BIT_BLK_CNT);
1109 } else {
1110 sdhci_writew(host, data->blocks, SDHCI_BLOCK_COUNT);
1111 }
1112}
1113
1114static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd)
1115{
1116 struct mmc_data *data = cmd->data;
1117
1118 sdhci_initialize_data(host, data);
1119
1120 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
1121 struct scatterlist *sg;
1122 unsigned int length_mask, offset_mask;
1123 int i;
1124
1125 host->flags |= SDHCI_REQ_USE_DMA;
1126
1127 /*
1128 * FIXME: This doesn't account for merging when mapping the
1129 * scatterlist.
1130 *
1131 * The assumption here being that alignment and lengths are
1132 * the same after DMA mapping to device address space.
1133 */
1134 length_mask = 0;
1135 offset_mask = 0;
1136 if (host->flags & SDHCI_USE_ADMA) {
1137 if (host->quirks & SDHCI_QUIRK_32BIT_ADMA_SIZE) {
1138 length_mask = 3;
1139 /*
1140 * As we use up to 3 byte chunks to work
1141 * around alignment problems, we need to
1142 * check the offset as well.
1143 */
1144 offset_mask = 3;
1145 }
1146 } else {
1147 if (host->quirks & SDHCI_QUIRK_32BIT_DMA_SIZE)
1148 length_mask = 3;
1149 if (host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR)
1150 offset_mask = 3;
1151 }
1152
1153 if (unlikely(length_mask | offset_mask)) {
1154 for_each_sg(data->sg, sg, data->sg_len, i) {
1155 if (sg->length & length_mask) {
1156 DBG("Reverting to PIO because of transfer size (%d)\n",
1157 sg->length);
1158 host->flags &= ~SDHCI_REQ_USE_DMA;
1159 break;
1160 }
1161 if (sg->offset & offset_mask) {
1162 DBG("Reverting to PIO because of bad alignment\n");
1163 host->flags &= ~SDHCI_REQ_USE_DMA;
1164 break;
1165 }
1166 }
1167 }
1168 }
1169
1170 if (host->flags & SDHCI_REQ_USE_DMA) {
1171 int sg_cnt = sdhci_pre_dma_transfer(host, data, COOKIE_MAPPED);
1172
1173 if (sg_cnt <= 0) {
1174 /*
1175 * This only happens when someone fed
1176 * us an invalid request.
1177 */
1178 WARN_ON(1);
1179 host->flags &= ~SDHCI_REQ_USE_DMA;
1180 } else if (host->flags & SDHCI_USE_ADMA) {
1181 sdhci_adma_table_pre(host, data, sg_cnt);
1182 sdhci_set_adma_addr(host, host->adma_addr);
1183 } else {
1184 WARN_ON(sg_cnt != 1);
1185 sdhci_set_sdma_addr(host, sdhci_sdma_address(host));
1186 }
1187 }
1188
1189 sdhci_config_dma(host);
1190
1191 if (!(host->flags & SDHCI_REQ_USE_DMA)) {
1192 int flags;
1193
1194 flags = SG_MITER_ATOMIC;
1195 if (host->data->flags & MMC_DATA_READ)
1196 flags |= SG_MITER_TO_SG;
1197 else
1198 flags |= SG_MITER_FROM_SG;
1199 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
1200 host->blocks = data->blocks;
1201 }
1202
1203 sdhci_set_transfer_irqs(host);
1204
1205 sdhci_set_block_info(host, data);
1206}
1207
1208#if IS_ENABLED(CONFIG_MMC_SDHCI_EXTERNAL_DMA)
1209
1210static int sdhci_external_dma_init(struct sdhci_host *host)
1211{
1212 int ret = 0;
1213 struct mmc_host *mmc = host->mmc;
1214
1215 host->tx_chan = dma_request_chan(mmc_dev(mmc), "tx");
1216 if (IS_ERR(host->tx_chan)) {
1217 ret = PTR_ERR(host->tx_chan);
1218 if (ret != -EPROBE_DEFER)
1219 pr_warn("Failed to request TX DMA channel.\n");
1220 host->tx_chan = NULL;
1221 return ret;
1222 }
1223
1224 host->rx_chan = dma_request_chan(mmc_dev(mmc), "rx");
1225 if (IS_ERR(host->rx_chan)) {
1226 if (host->tx_chan) {
1227 dma_release_channel(host->tx_chan);
1228 host->tx_chan = NULL;
1229 }
1230
1231 ret = PTR_ERR(host->rx_chan);
1232 if (ret != -EPROBE_DEFER)
1233 pr_warn("Failed to request RX DMA channel.\n");
1234 host->rx_chan = NULL;
1235 }
1236
1237 return ret;
1238}
1239
1240static struct dma_chan *sdhci_external_dma_channel(struct sdhci_host *host,
1241 struct mmc_data *data)
1242{
1243 return data->flags & MMC_DATA_WRITE ? host->tx_chan : host->rx_chan;
1244}
1245
1246static int sdhci_external_dma_setup(struct sdhci_host *host,
1247 struct mmc_command *cmd)
1248{
1249 int ret, i;
1250 enum dma_transfer_direction dir;
1251 struct dma_async_tx_descriptor *desc;
1252 struct mmc_data *data = cmd->data;
1253 struct dma_chan *chan;
1254 struct dma_slave_config cfg;
1255 dma_cookie_t cookie;
1256 int sg_cnt;
1257
1258 if (!host->mapbase)
1259 return -EINVAL;
1260
1261 memset(&cfg, 0, sizeof(cfg));
1262 cfg.src_addr = host->mapbase + SDHCI_BUFFER;
1263 cfg.dst_addr = host->mapbase + SDHCI_BUFFER;
1264 cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
1265 cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
1266 cfg.src_maxburst = data->blksz / 4;
1267 cfg.dst_maxburst = data->blksz / 4;
1268
1269 /* Sanity check: all the SG entries must be aligned by block size. */
1270 for (i = 0; i < data->sg_len; i++) {
1271 if ((data->sg + i)->length % data->blksz)
1272 return -EINVAL;
1273 }
1274
1275 chan = sdhci_external_dma_channel(host, data);
1276
1277 ret = dmaengine_slave_config(chan, &cfg);
1278 if (ret)
1279 return ret;
1280
1281 sg_cnt = sdhci_pre_dma_transfer(host, data, COOKIE_MAPPED);
1282 if (sg_cnt <= 0)
1283 return -EINVAL;
1284
1285 dir = data->flags & MMC_DATA_WRITE ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;
1286 desc = dmaengine_prep_slave_sg(chan, data->sg, data->sg_len, dir,
1287 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1288 if (!desc)
1289 return -EINVAL;
1290
1291 desc->callback = NULL;
1292 desc->callback_param = NULL;
1293
1294 cookie = dmaengine_submit(desc);
1295 if (dma_submit_error(cookie))
1296 ret = cookie;
1297
1298 return ret;
1299}
1300
1301static void sdhci_external_dma_release(struct sdhci_host *host)
1302{
1303 if (host->tx_chan) {
1304 dma_release_channel(host->tx_chan);
1305 host->tx_chan = NULL;
1306 }
1307
1308 if (host->rx_chan) {
1309 dma_release_channel(host->rx_chan);
1310 host->rx_chan = NULL;
1311 }
1312
1313 sdhci_switch_external_dma(host, false);
1314}
1315
1316static void __sdhci_external_dma_prepare_data(struct sdhci_host *host,
1317 struct mmc_command *cmd)
1318{
1319 struct mmc_data *data = cmd->data;
1320
1321 sdhci_initialize_data(host, data);
1322
1323 host->flags |= SDHCI_REQ_USE_DMA;
1324 sdhci_set_transfer_irqs(host);
1325
1326 sdhci_set_block_info(host, data);
1327}
1328
1329static void sdhci_external_dma_prepare_data(struct sdhci_host *host,
1330 struct mmc_command *cmd)
1331{
1332 if (!sdhci_external_dma_setup(host, cmd)) {
1333 __sdhci_external_dma_prepare_data(host, cmd);
1334 } else {
1335 sdhci_external_dma_release(host);
1336 pr_err("%s: Cannot use external DMA, switch to the DMA/PIO which standard SDHCI provides.\n",
1337 mmc_hostname(host->mmc));
1338 sdhci_prepare_data(host, cmd);
1339 }
1340}
1341
1342static void sdhci_external_dma_pre_transfer(struct sdhci_host *host,
1343 struct mmc_command *cmd)
1344{
1345 struct dma_chan *chan;
1346
1347 if (!cmd->data)
1348 return;
1349
1350 chan = sdhci_external_dma_channel(host, cmd->data);
1351 if (chan)
1352 dma_async_issue_pending(chan);
1353}
1354
1355#else
1356
1357static inline int sdhci_external_dma_init(struct sdhci_host *host)
1358{
1359 return -EOPNOTSUPP;
1360}
1361
1362static inline void sdhci_external_dma_release(struct sdhci_host *host)
1363{
1364}
1365
1366static inline void sdhci_external_dma_prepare_data(struct sdhci_host *host,
1367 struct mmc_command *cmd)
1368{
1369 /* This should never happen */
1370 WARN_ON_ONCE(1);
1371}
1372
1373static inline void sdhci_external_dma_pre_transfer(struct sdhci_host *host,
1374 struct mmc_command *cmd)
1375{
1376}
1377
1378static inline struct dma_chan *sdhci_external_dma_channel(struct sdhci_host *host,
1379 struct mmc_data *data)
1380{
1381 return NULL;
1382}
1383
1384#endif
1385
1386void sdhci_switch_external_dma(struct sdhci_host *host, bool en)
1387{
1388 host->use_external_dma = en;
1389}
1390EXPORT_SYMBOL_GPL(sdhci_switch_external_dma);
1391
1392static inline bool sdhci_auto_cmd12(struct sdhci_host *host,
1393 struct mmc_request *mrq)
1394{
1395 return !mrq->sbc && (host->flags & SDHCI_AUTO_CMD12) &&
1396 !mrq->cap_cmd_during_tfr;
1397}
1398
1399static inline bool sdhci_auto_cmd23(struct sdhci_host *host,
1400 struct mmc_request *mrq)
1401{
1402 return mrq->sbc && (host->flags & SDHCI_AUTO_CMD23);
1403}
1404
1405static inline bool sdhci_manual_cmd23(struct sdhci_host *host,
1406 struct mmc_request *mrq)
1407{
1408 return mrq->sbc && !(host->flags & SDHCI_AUTO_CMD23);
1409}
1410
1411static inline void sdhci_auto_cmd_select(struct sdhci_host *host,
1412 struct mmc_command *cmd,
1413 u16 *mode)
1414{
1415 bool use_cmd12 = sdhci_auto_cmd12(host, cmd->mrq) &&
1416 (cmd->opcode != SD_IO_RW_EXTENDED);
1417 bool use_cmd23 = sdhci_auto_cmd23(host, cmd->mrq);
1418 u16 ctrl2;
1419
1420 /*
1421 * In case of Version 4.10 or later, use of 'Auto CMD Auto
1422 * Select' is recommended rather than use of 'Auto CMD12
1423 * Enable' or 'Auto CMD23 Enable'. We require Version 4 Mode
1424 * here because some controllers (e.g sdhci-of-dwmshc) expect it.
1425 */
1426 if (host->version >= SDHCI_SPEC_410 && host->v4_mode &&
1427 (use_cmd12 || use_cmd23)) {
1428 *mode |= SDHCI_TRNS_AUTO_SEL;
1429
1430 ctrl2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1431 if (use_cmd23)
1432 ctrl2 |= SDHCI_CMD23_ENABLE;
1433 else
1434 ctrl2 &= ~SDHCI_CMD23_ENABLE;
1435 sdhci_writew(host, ctrl2, SDHCI_HOST_CONTROL2);
1436
1437 return;
1438 }
1439
1440 /*
1441 * If we are sending CMD23, CMD12 never gets sent
1442 * on successful completion (so no Auto-CMD12).
1443 */
1444 if (use_cmd12)
1445 *mode |= SDHCI_TRNS_AUTO_CMD12;
1446 else if (use_cmd23)
1447 *mode |= SDHCI_TRNS_AUTO_CMD23;
1448}
1449
1450static void sdhci_set_transfer_mode(struct sdhci_host *host,
1451 struct mmc_command *cmd)
1452{
1453 u16 mode = 0;
1454 struct mmc_data *data = cmd->data;
1455
1456 if (data == NULL) {
1457 if (host->quirks2 &
1458 SDHCI_QUIRK2_CLEAR_TRANSFERMODE_REG_BEFORE_CMD) {
1459 /* must not clear SDHCI_TRANSFER_MODE when tuning */
1460 if (!mmc_op_tuning(cmd->opcode))
1461 sdhci_writew(host, 0x0, SDHCI_TRANSFER_MODE);
1462 } else {
1463 /* clear Auto CMD settings for no data CMDs */
1464 mode = sdhci_readw(host, SDHCI_TRANSFER_MODE);
1465 sdhci_writew(host, mode & ~(SDHCI_TRNS_AUTO_CMD12 |
1466 SDHCI_TRNS_AUTO_CMD23), SDHCI_TRANSFER_MODE);
1467 }
1468 return;
1469 }
1470
1471 WARN_ON(!host->data);
1472
1473 if (!(host->quirks2 & SDHCI_QUIRK2_SUPPORT_SINGLE))
1474 mode = SDHCI_TRNS_BLK_CNT_EN;
1475
1476 if (mmc_op_multi(cmd->opcode) || data->blocks > 1) {
1477 mode = SDHCI_TRNS_BLK_CNT_EN | SDHCI_TRNS_MULTI;
1478 sdhci_auto_cmd_select(host, cmd, &mode);
1479 if (sdhci_auto_cmd23(host, cmd->mrq))
1480 sdhci_writel(host, cmd->mrq->sbc->arg, SDHCI_ARGUMENT2);
1481 }
1482
1483 if (data->flags & MMC_DATA_READ)
1484 mode |= SDHCI_TRNS_READ;
1485 if (host->flags & SDHCI_REQ_USE_DMA)
1486 mode |= SDHCI_TRNS_DMA;
1487
1488 sdhci_writew(host, mode, SDHCI_TRANSFER_MODE);
1489}
1490
1491static bool sdhci_needs_reset(struct sdhci_host *host, struct mmc_request *mrq)
1492{
1493 return (!(host->flags & SDHCI_DEVICE_DEAD) &&
1494 ((mrq->cmd && mrq->cmd->error) ||
1495 (mrq->sbc && mrq->sbc->error) ||
1496 (mrq->data && mrq->data->stop && mrq->data->stop->error) ||
1497 (host->quirks & SDHCI_QUIRK_RESET_AFTER_REQUEST)));
1498}
1499
1500static void sdhci_set_mrq_done(struct sdhci_host *host, struct mmc_request *mrq)
1501{
1502 int i;
1503
1504 for (i = 0; i < SDHCI_MAX_MRQS; i++) {
1505 if (host->mrqs_done[i] == mrq) {
1506 WARN_ON(1);
1507 return;
1508 }
1509 }
1510
1511 for (i = 0; i < SDHCI_MAX_MRQS; i++) {
1512 if (!host->mrqs_done[i]) {
1513 host->mrqs_done[i] = mrq;
1514 break;
1515 }
1516 }
1517
1518 WARN_ON(i >= SDHCI_MAX_MRQS);
1519}
1520
1521static void __sdhci_finish_mrq(struct sdhci_host *host, struct mmc_request *mrq)
1522{
1523 if (host->cmd && host->cmd->mrq == mrq)
1524 host->cmd = NULL;
1525
1526 if (host->data_cmd && host->data_cmd->mrq == mrq)
1527 host->data_cmd = NULL;
1528
1529 if (host->deferred_cmd && host->deferred_cmd->mrq == mrq)
1530 host->deferred_cmd = NULL;
1531
1532 if (host->data && host->data->mrq == mrq)
1533 host->data = NULL;
1534
1535 if (sdhci_needs_reset(host, mrq))
1536 host->pending_reset = true;
1537
1538 sdhci_set_mrq_done(host, mrq);
1539
1540 sdhci_del_timer(host, mrq);
1541
1542 if (!sdhci_has_requests(host))
1543 sdhci_led_deactivate(host);
1544}
1545
1546static void sdhci_finish_mrq(struct sdhci_host *host, struct mmc_request *mrq)
1547{
1548 __sdhci_finish_mrq(host, mrq);
1549
1550 queue_work(host->complete_wq, &host->complete_work);
1551}
1552
1553static void __sdhci_finish_data(struct sdhci_host *host, bool sw_data_timeout)
1554{
1555 struct mmc_command *data_cmd = host->data_cmd;
1556 struct mmc_data *data = host->data;
1557
1558 host->data = NULL;
1559 host->data_cmd = NULL;
1560
1561 /*
1562 * The controller needs a reset of internal state machines upon error
1563 * conditions.
1564 */
1565 if (data->error) {
1566 if (!host->cmd || host->cmd == data_cmd)
1567 sdhci_reset_for(host, REQUEST_ERROR);
1568 else
1569 sdhci_reset_for(host, REQUEST_ERROR_DATA_ONLY);
1570 }
1571
1572 if ((host->flags & (SDHCI_REQ_USE_DMA | SDHCI_USE_ADMA)) ==
1573 (SDHCI_REQ_USE_DMA | SDHCI_USE_ADMA))
1574 sdhci_adma_table_post(host, data);
1575
1576 /*
1577 * The specification states that the block count register must
1578 * be updated, but it does not specify at what point in the
1579 * data flow. That makes the register entirely useless to read
1580 * back so we have to assume that nothing made it to the card
1581 * in the event of an error.
1582 */
1583 if (data->error)
1584 data->bytes_xfered = 0;
1585 else
1586 data->bytes_xfered = data->blksz * data->blocks;
1587
1588 /*
1589 * Need to send CMD12 if -
1590 * a) open-ended multiblock transfer not using auto CMD12 (no CMD23)
1591 * b) error in multiblock transfer
1592 */
1593 if (data->stop &&
1594 ((!data->mrq->sbc && !sdhci_auto_cmd12(host, data->mrq)) ||
1595 data->error)) {
1596 /*
1597 * 'cap_cmd_during_tfr' request must not use the command line
1598 * after mmc_command_done() has been called. It is upper layer's
1599 * responsibility to send the stop command if required.
1600 */
1601 if (data->mrq->cap_cmd_during_tfr) {
1602 __sdhci_finish_mrq(host, data->mrq);
1603 } else {
1604 /* Avoid triggering warning in sdhci_send_command() */
1605 host->cmd = NULL;
1606 if (!sdhci_send_command(host, data->stop)) {
1607 if (sw_data_timeout) {
1608 /*
1609 * This is anyway a sw data timeout, so
1610 * give up now.
1611 */
1612 data->stop->error = -EIO;
1613 __sdhci_finish_mrq(host, data->mrq);
1614 } else {
1615 WARN_ON(host->deferred_cmd);
1616 host->deferred_cmd = data->stop;
1617 }
1618 }
1619 }
1620 } else {
1621 __sdhci_finish_mrq(host, data->mrq);
1622 }
1623}
1624
1625static void sdhci_finish_data(struct sdhci_host *host)
1626{
1627 __sdhci_finish_data(host, false);
1628}
1629
1630static bool sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
1631{
1632 int flags;
1633 u32 mask;
1634 unsigned long timeout;
1635
1636 WARN_ON(host->cmd);
1637
1638 /* Initially, a command has no error */
1639 cmd->error = 0;
1640
1641 if ((host->quirks2 & SDHCI_QUIRK2_STOP_WITH_TC) &&
1642 cmd->opcode == MMC_STOP_TRANSMISSION)
1643 cmd->flags |= MMC_RSP_BUSY;
1644
1645 mask = SDHCI_CMD_INHIBIT;
1646 if (sdhci_data_line_cmd(cmd))
1647 mask |= SDHCI_DATA_INHIBIT;
1648
1649 /* We shouldn't wait for data inihibit for stop commands, even
1650 though they might use busy signaling */
1651 if (cmd->mrq->data && (cmd == cmd->mrq->data->stop))
1652 mask &= ~SDHCI_DATA_INHIBIT;
1653
1654 if (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask)
1655 return false;
1656
1657 host->cmd = cmd;
1658 host->data_timeout = 0;
1659 if (sdhci_data_line_cmd(cmd)) {
1660 WARN_ON(host->data_cmd);
1661 host->data_cmd = cmd;
1662 sdhci_set_timeout(host, cmd);
1663 }
1664
1665 if (cmd->data) {
1666 if (host->use_external_dma)
1667 sdhci_external_dma_prepare_data(host, cmd);
1668 else
1669 sdhci_prepare_data(host, cmd);
1670 }
1671
1672 sdhci_writel(host, cmd->arg, SDHCI_ARGUMENT);
1673
1674 sdhci_set_transfer_mode(host, cmd);
1675
1676 if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
1677 WARN_ONCE(1, "Unsupported response type!\n");
1678 /*
1679 * This does not happen in practice because 136-bit response
1680 * commands never have busy waiting, so rather than complicate
1681 * the error path, just remove busy waiting and continue.
1682 */
1683 cmd->flags &= ~MMC_RSP_BUSY;
1684 }
1685
1686 if (!(cmd->flags & MMC_RSP_PRESENT))
1687 flags = SDHCI_CMD_RESP_NONE;
1688 else if (cmd->flags & MMC_RSP_136)
1689 flags = SDHCI_CMD_RESP_LONG;
1690 else if (cmd->flags & MMC_RSP_BUSY)
1691 flags = SDHCI_CMD_RESP_SHORT_BUSY;
1692 else
1693 flags = SDHCI_CMD_RESP_SHORT;
1694
1695 if (cmd->flags & MMC_RSP_CRC)
1696 flags |= SDHCI_CMD_CRC;
1697 if (cmd->flags & MMC_RSP_OPCODE)
1698 flags |= SDHCI_CMD_INDEX;
1699
1700 /* CMD19 is special in that the Data Present Select should be set */
1701 if (cmd->data || mmc_op_tuning(cmd->opcode))
1702 flags |= SDHCI_CMD_DATA;
1703
1704 timeout = jiffies;
1705 if (host->data_timeout)
1706 timeout += nsecs_to_jiffies(host->data_timeout);
1707 else if (!cmd->data && cmd->busy_timeout > 9000)
1708 timeout += DIV_ROUND_UP(cmd->busy_timeout, 1000) * HZ + HZ;
1709 else
1710 timeout += 10 * HZ;
1711 sdhci_mod_timer(host, cmd->mrq, timeout);
1712
1713 if (host->use_external_dma)
1714 sdhci_external_dma_pre_transfer(host, cmd);
1715
1716 sdhci_writew(host, SDHCI_MAKE_CMD(cmd->opcode, flags), SDHCI_COMMAND);
1717
1718 return true;
1719}
1720
1721static bool sdhci_present_error(struct sdhci_host *host,
1722 struct mmc_command *cmd, bool present)
1723{
1724 if (!present || host->flags & SDHCI_DEVICE_DEAD) {
1725 cmd->error = -ENOMEDIUM;
1726 return true;
1727 }
1728
1729 return false;
1730}
1731
1732static bool sdhci_send_command_retry(struct sdhci_host *host,
1733 struct mmc_command *cmd,
1734 unsigned long flags)
1735 __releases(host->lock)
1736 __acquires(host->lock)
1737{
1738 struct mmc_command *deferred_cmd = host->deferred_cmd;
1739 int timeout = 10; /* Approx. 10 ms */
1740 bool present;
1741
1742 while (!sdhci_send_command(host, cmd)) {
1743 if (!timeout--) {
1744 pr_err("%s: Controller never released inhibit bit(s).\n",
1745 mmc_hostname(host->mmc));
1746 sdhci_err_stats_inc(host, CTRL_TIMEOUT);
1747 sdhci_dumpregs(host);
1748 cmd->error = -EIO;
1749 return false;
1750 }
1751
1752 spin_unlock_irqrestore(&host->lock, flags);
1753
1754 usleep_range(1000, 1250);
1755
1756 present = host->mmc->ops->get_cd(host->mmc);
1757
1758 spin_lock_irqsave(&host->lock, flags);
1759
1760 /* A deferred command might disappear, handle that */
1761 if (cmd == deferred_cmd && cmd != host->deferred_cmd)
1762 return true;
1763
1764 if (sdhci_present_error(host, cmd, present))
1765 return false;
1766 }
1767
1768 if (cmd == host->deferred_cmd)
1769 host->deferred_cmd = NULL;
1770
1771 return true;
1772}
1773
1774static void sdhci_read_rsp_136(struct sdhci_host *host, struct mmc_command *cmd)
1775{
1776 int i, reg;
1777
1778 for (i = 0; i < 4; i++) {
1779 reg = SDHCI_RESPONSE + (3 - i) * 4;
1780 cmd->resp[i] = sdhci_readl(host, reg);
1781 }
1782
1783 if (host->quirks2 & SDHCI_QUIRK2_RSP_136_HAS_CRC)
1784 return;
1785
1786 /* CRC is stripped so we need to do some shifting */
1787 for (i = 0; i < 4; i++) {
1788 cmd->resp[i] <<= 8;
1789 if (i != 3)
1790 cmd->resp[i] |= cmd->resp[i + 1] >> 24;
1791 }
1792}
1793
1794static void sdhci_finish_command(struct sdhci_host *host)
1795{
1796 struct mmc_command *cmd = host->cmd;
1797
1798 host->cmd = NULL;
1799
1800 if (cmd->flags & MMC_RSP_PRESENT) {
1801 if (cmd->flags & MMC_RSP_136) {
1802 sdhci_read_rsp_136(host, cmd);
1803 } else {
1804 cmd->resp[0] = sdhci_readl(host, SDHCI_RESPONSE);
1805 }
1806 }
1807
1808 if (cmd->mrq->cap_cmd_during_tfr && cmd == cmd->mrq->cmd)
1809 mmc_command_done(host->mmc, cmd->mrq);
1810
1811 /*
1812 * The host can send and interrupt when the busy state has
1813 * ended, allowing us to wait without wasting CPU cycles.
1814 * The busy signal uses DAT0 so this is similar to waiting
1815 * for data to complete.
1816 *
1817 * Note: The 1.0 specification is a bit ambiguous about this
1818 * feature so there might be some problems with older
1819 * controllers.
1820 */
1821 if (cmd->flags & MMC_RSP_BUSY) {
1822 if (cmd->data) {
1823 DBG("Cannot wait for busy signal when also doing a data transfer");
1824 } else if (!(host->quirks & SDHCI_QUIRK_NO_BUSY_IRQ) &&
1825 cmd == host->data_cmd) {
1826 /* Command complete before busy is ended */
1827 return;
1828 }
1829 }
1830
1831 /* Finished CMD23, now send actual command. */
1832 if (cmd == cmd->mrq->sbc) {
1833 if (!sdhci_send_command(host, cmd->mrq->cmd)) {
1834 WARN_ON(host->deferred_cmd);
1835 host->deferred_cmd = cmd->mrq->cmd;
1836 }
1837 } else {
1838
1839 /* Processed actual command. */
1840 if (host->data && host->data_early)
1841 sdhci_finish_data(host);
1842
1843 if (!cmd->data)
1844 __sdhci_finish_mrq(host, cmd->mrq);
1845 }
1846}
1847
1848static u16 sdhci_get_preset_value(struct sdhci_host *host)
1849{
1850 u16 preset = 0;
1851
1852 switch (host->timing) {
1853 case MMC_TIMING_MMC_HS:
1854 case MMC_TIMING_SD_HS:
1855 preset = sdhci_readw(host, SDHCI_PRESET_FOR_HIGH_SPEED);
1856 break;
1857 case MMC_TIMING_UHS_SDR12:
1858 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR12);
1859 break;
1860 case MMC_TIMING_UHS_SDR25:
1861 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR25);
1862 break;
1863 case MMC_TIMING_UHS_SDR50:
1864 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR50);
1865 break;
1866 case MMC_TIMING_UHS_SDR104:
1867 case MMC_TIMING_MMC_HS200:
1868 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR104);
1869 break;
1870 case MMC_TIMING_UHS_DDR50:
1871 case MMC_TIMING_MMC_DDR52:
1872 preset = sdhci_readw(host, SDHCI_PRESET_FOR_DDR50);
1873 break;
1874 case MMC_TIMING_MMC_HS400:
1875 preset = sdhci_readw(host, SDHCI_PRESET_FOR_HS400);
1876 break;
1877 default:
1878 pr_warn("%s: Invalid UHS-I mode selected\n",
1879 mmc_hostname(host->mmc));
1880 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR12);
1881 break;
1882 }
1883 return preset;
1884}
1885
1886u16 sdhci_calc_clk(struct sdhci_host *host, unsigned int clock,
1887 unsigned int *actual_clock)
1888{
1889 int div = 0; /* Initialized for compiler warning */
1890 int real_div = div, clk_mul = 1;
1891 u16 clk = 0;
1892 bool switch_base_clk = false;
1893
1894 if (host->version >= SDHCI_SPEC_300) {
1895 if (host->preset_enabled) {
1896 u16 pre_val;
1897
1898 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1899 pre_val = sdhci_get_preset_value(host);
1900 div = FIELD_GET(SDHCI_PRESET_SDCLK_FREQ_MASK, pre_val);
1901 if (host->clk_mul &&
1902 (pre_val & SDHCI_PRESET_CLKGEN_SEL)) {
1903 clk = SDHCI_PROG_CLOCK_MODE;
1904 real_div = div + 1;
1905 clk_mul = host->clk_mul;
1906 } else {
1907 real_div = max_t(int, 1, div << 1);
1908 }
1909 goto clock_set;
1910 }
1911
1912 /*
1913 * Check if the Host Controller supports Programmable Clock
1914 * Mode.
1915 */
1916 if (host->clk_mul) {
1917 for (div = 1; div <= 1024; div++) {
1918 if ((host->max_clk * host->clk_mul / div)
1919 <= clock)
1920 break;
1921 }
1922 if ((host->max_clk * host->clk_mul / div) <= clock) {
1923 /*
1924 * Set Programmable Clock Mode in the Clock
1925 * Control register.
1926 */
1927 clk = SDHCI_PROG_CLOCK_MODE;
1928 real_div = div;
1929 clk_mul = host->clk_mul;
1930 div--;
1931 } else {
1932 /*
1933 * Divisor can be too small to reach clock
1934 * speed requirement. Then use the base clock.
1935 */
1936 switch_base_clk = true;
1937 }
1938 }
1939
1940 if (!host->clk_mul || switch_base_clk) {
1941 /* Version 3.00 divisors must be a multiple of 2. */
1942 if (host->max_clk <= clock)
1943 div = 1;
1944 else {
1945 for (div = 2; div < SDHCI_MAX_DIV_SPEC_300;
1946 div += 2) {
1947 if ((host->max_clk / div) <= clock)
1948 break;
1949 }
1950 }
1951 real_div = div;
1952 div >>= 1;
1953 if ((host->quirks2 & SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN)
1954 && !div && host->max_clk <= 25000000)
1955 div = 1;
1956 }
1957 } else {
1958 /* Version 2.00 divisors must be a power of 2. */
1959 for (div = 1; div < SDHCI_MAX_DIV_SPEC_200; div *= 2) {
1960 if ((host->max_clk / div) <= clock)
1961 break;
1962 }
1963 real_div = div;
1964 div >>= 1;
1965 }
1966
1967clock_set:
1968 if (real_div)
1969 *actual_clock = (host->max_clk * clk_mul) / real_div;
1970 clk |= (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT;
1971 clk |= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN)
1972 << SDHCI_DIVIDER_HI_SHIFT;
1973
1974 return clk;
1975}
1976EXPORT_SYMBOL_GPL(sdhci_calc_clk);
1977
1978void sdhci_enable_clk(struct sdhci_host *host, u16 clk)
1979{
1980 ktime_t timeout;
1981
1982 clk |= SDHCI_CLOCK_INT_EN;
1983 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1984
1985 /* Wait max 150 ms */
1986 timeout = ktime_add_ms(ktime_get(), 150);
1987 while (1) {
1988 bool timedout = ktime_after(ktime_get(), timeout);
1989
1990 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1991 if (clk & SDHCI_CLOCK_INT_STABLE)
1992 break;
1993 if (timedout) {
1994 pr_err("%s: Internal clock never stabilised.\n",
1995 mmc_hostname(host->mmc));
1996 sdhci_err_stats_inc(host, CTRL_TIMEOUT);
1997 sdhci_dumpregs(host);
1998 return;
1999 }
2000 udelay(10);
2001 }
2002
2003 if (host->version >= SDHCI_SPEC_410 && host->v4_mode) {
2004 clk |= SDHCI_CLOCK_PLL_EN;
2005 clk &= ~SDHCI_CLOCK_INT_STABLE;
2006 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
2007
2008 /* Wait max 150 ms */
2009 timeout = ktime_add_ms(ktime_get(), 150);
2010 while (1) {
2011 bool timedout = ktime_after(ktime_get(), timeout);
2012
2013 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
2014 if (clk & SDHCI_CLOCK_INT_STABLE)
2015 break;
2016 if (timedout) {
2017 pr_err("%s: PLL clock never stabilised.\n",
2018 mmc_hostname(host->mmc));
2019 sdhci_err_stats_inc(host, CTRL_TIMEOUT);
2020 sdhci_dumpregs(host);
2021 return;
2022 }
2023 udelay(10);
2024 }
2025 }
2026
2027 clk |= SDHCI_CLOCK_CARD_EN;
2028 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
2029}
2030EXPORT_SYMBOL_GPL(sdhci_enable_clk);
2031
2032void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
2033{
2034 u16 clk;
2035
2036 host->mmc->actual_clock = 0;
2037
2038 sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
2039
2040 if (clock == 0)
2041 return;
2042
2043 clk = sdhci_calc_clk(host, clock, &host->mmc->actual_clock);
2044 sdhci_enable_clk(host, clk);
2045}
2046EXPORT_SYMBOL_GPL(sdhci_set_clock);
2047
2048static void sdhci_set_power_reg(struct sdhci_host *host, unsigned char mode,
2049 unsigned short vdd)
2050{
2051 struct mmc_host *mmc = host->mmc;
2052
2053 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
2054
2055 if (mode != MMC_POWER_OFF)
2056 sdhci_writeb(host, SDHCI_POWER_ON, SDHCI_POWER_CONTROL);
2057 else
2058 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
2059}
2060
2061void sdhci_set_power_noreg(struct sdhci_host *host, unsigned char mode,
2062 unsigned short vdd)
2063{
2064 u8 pwr = 0;
2065
2066 if (mode != MMC_POWER_OFF) {
2067 switch (1 << vdd) {
2068 case MMC_VDD_165_195:
2069 /*
2070 * Without a regulator, SDHCI does not support 2.0v
2071 * so we only get here if the driver deliberately
2072 * added the 2.0v range to ocr_avail. Map it to 1.8v
2073 * for the purpose of turning on the power.
2074 */
2075 case MMC_VDD_20_21:
2076 pwr = SDHCI_POWER_180;
2077 break;
2078 case MMC_VDD_29_30:
2079 case MMC_VDD_30_31:
2080 pwr = SDHCI_POWER_300;
2081 break;
2082 case MMC_VDD_32_33:
2083 case MMC_VDD_33_34:
2084 /*
2085 * 3.4 ~ 3.6V are valid only for those platforms where it's
2086 * known that the voltage range is supported by hardware.
2087 */
2088 case MMC_VDD_34_35:
2089 case MMC_VDD_35_36:
2090 pwr = SDHCI_POWER_330;
2091 break;
2092 default:
2093 WARN(1, "%s: Invalid vdd %#x\n",
2094 mmc_hostname(host->mmc), vdd);
2095 break;
2096 }
2097 }
2098
2099 if (host->pwr == pwr)
2100 return;
2101
2102 host->pwr = pwr;
2103
2104 if (pwr == 0) {
2105 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
2106 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
2107 sdhci_runtime_pm_bus_off(host);
2108 } else {
2109 /*
2110 * Spec says that we should clear the power reg before setting
2111 * a new value. Some controllers don't seem to like this though.
2112 */
2113 if (!(host->quirks & SDHCI_QUIRK_SINGLE_POWER_WRITE))
2114 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
2115
2116 /*
2117 * At least the Marvell CaFe chip gets confused if we set the
2118 * voltage and set turn on power at the same time, so set the
2119 * voltage first.
2120 */
2121 if (host->quirks & SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER)
2122 sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
2123
2124 pwr |= SDHCI_POWER_ON;
2125
2126 sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
2127
2128 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
2129 sdhci_runtime_pm_bus_on(host);
2130
2131 /*
2132 * Some controllers need an extra 10ms delay of 10ms before
2133 * they can apply clock after applying power
2134 */
2135 if (host->quirks & SDHCI_QUIRK_DELAY_AFTER_POWER)
2136 mdelay(10);
2137 }
2138}
2139EXPORT_SYMBOL_GPL(sdhci_set_power_noreg);
2140
2141void sdhci_set_power(struct sdhci_host *host, unsigned char mode,
2142 unsigned short vdd)
2143{
2144 if (IS_ERR(host->mmc->supply.vmmc))
2145 sdhci_set_power_noreg(host, mode, vdd);
2146 else
2147 sdhci_set_power_reg(host, mode, vdd);
2148}
2149EXPORT_SYMBOL_GPL(sdhci_set_power);
2150
2151/*
2152 * Some controllers need to configure a valid bus voltage on their power
2153 * register regardless of whether an external regulator is taking care of power
2154 * supply. This helper function takes care of it if set as the controller's
2155 * sdhci_ops.set_power callback.
2156 */
2157void sdhci_set_power_and_bus_voltage(struct sdhci_host *host,
2158 unsigned char mode,
2159 unsigned short vdd)
2160{
2161 if (!IS_ERR(host->mmc->supply.vmmc)) {
2162 struct mmc_host *mmc = host->mmc;
2163
2164 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
2165 }
2166 sdhci_set_power_noreg(host, mode, vdd);
2167}
2168EXPORT_SYMBOL_GPL(sdhci_set_power_and_bus_voltage);
2169
2170/*****************************************************************************\
2171 * *
2172 * MMC callbacks *
2173 * *
2174\*****************************************************************************/
2175
2176void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
2177{
2178 struct sdhci_host *host = mmc_priv(mmc);
2179 struct mmc_command *cmd;
2180 unsigned long flags;
2181 bool present;
2182
2183 /* Firstly check card presence */
2184 present = mmc->ops->get_cd(mmc);
2185
2186 spin_lock_irqsave(&host->lock, flags);
2187
2188 sdhci_led_activate(host);
2189
2190 if (sdhci_present_error(host, mrq->cmd, present))
2191 goto out_finish;
2192
2193 cmd = sdhci_manual_cmd23(host, mrq) ? mrq->sbc : mrq->cmd;
2194
2195 if (!sdhci_send_command_retry(host, cmd, flags))
2196 goto out_finish;
2197
2198 spin_unlock_irqrestore(&host->lock, flags);
2199
2200 return;
2201
2202out_finish:
2203 sdhci_finish_mrq(host, mrq);
2204 spin_unlock_irqrestore(&host->lock, flags);
2205}
2206EXPORT_SYMBOL_GPL(sdhci_request);
2207
2208int sdhci_request_atomic(struct mmc_host *mmc, struct mmc_request *mrq)
2209{
2210 struct sdhci_host *host = mmc_priv(mmc);
2211 struct mmc_command *cmd;
2212 unsigned long flags;
2213 int ret = 0;
2214
2215 spin_lock_irqsave(&host->lock, flags);
2216
2217 if (sdhci_present_error(host, mrq->cmd, true)) {
2218 sdhci_finish_mrq(host, mrq);
2219 goto out_finish;
2220 }
2221
2222 cmd = sdhci_manual_cmd23(host, mrq) ? mrq->sbc : mrq->cmd;
2223
2224 /*
2225 * The HSQ may send a command in interrupt context without polling
2226 * the busy signaling, which means we should return BUSY if controller
2227 * has not released inhibit bits to allow HSQ trying to send request
2228 * again in non-atomic context. So we should not finish this request
2229 * here.
2230 */
2231 if (!sdhci_send_command(host, cmd))
2232 ret = -EBUSY;
2233 else
2234 sdhci_led_activate(host);
2235
2236out_finish:
2237 spin_unlock_irqrestore(&host->lock, flags);
2238 return ret;
2239}
2240EXPORT_SYMBOL_GPL(sdhci_request_atomic);
2241
2242void sdhci_set_bus_width(struct sdhci_host *host, int width)
2243{
2244 u8 ctrl;
2245
2246 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
2247 if (width == MMC_BUS_WIDTH_8) {
2248 ctrl &= ~SDHCI_CTRL_4BITBUS;
2249 ctrl |= SDHCI_CTRL_8BITBUS;
2250 } else {
2251 if (host->mmc->caps & MMC_CAP_8_BIT_DATA)
2252 ctrl &= ~SDHCI_CTRL_8BITBUS;
2253 if (width == MMC_BUS_WIDTH_4)
2254 ctrl |= SDHCI_CTRL_4BITBUS;
2255 else
2256 ctrl &= ~SDHCI_CTRL_4BITBUS;
2257 }
2258 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
2259}
2260EXPORT_SYMBOL_GPL(sdhci_set_bus_width);
2261
2262void sdhci_set_uhs_signaling(struct sdhci_host *host, unsigned timing)
2263{
2264 u16 ctrl_2;
2265
2266 ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2267 /* Select Bus Speed Mode for host */
2268 ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
2269 if ((timing == MMC_TIMING_MMC_HS200) ||
2270 (timing == MMC_TIMING_UHS_SDR104))
2271 ctrl_2 |= SDHCI_CTRL_UHS_SDR104;
2272 else if (timing == MMC_TIMING_UHS_SDR12)
2273 ctrl_2 |= SDHCI_CTRL_UHS_SDR12;
2274 else if (timing == MMC_TIMING_UHS_SDR25)
2275 ctrl_2 |= SDHCI_CTRL_UHS_SDR25;
2276 else if (timing == MMC_TIMING_UHS_SDR50)
2277 ctrl_2 |= SDHCI_CTRL_UHS_SDR50;
2278 else if ((timing == MMC_TIMING_UHS_DDR50) ||
2279 (timing == MMC_TIMING_MMC_DDR52))
2280 ctrl_2 |= SDHCI_CTRL_UHS_DDR50;
2281 else if (timing == MMC_TIMING_MMC_HS400)
2282 ctrl_2 |= SDHCI_CTRL_HS400; /* Non-standard */
2283 sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
2284}
2285EXPORT_SYMBOL_GPL(sdhci_set_uhs_signaling);
2286
2287static bool sdhci_timing_has_preset(unsigned char timing)
2288{
2289 switch (timing) {
2290 case MMC_TIMING_UHS_SDR12:
2291 case MMC_TIMING_UHS_SDR25:
2292 case MMC_TIMING_UHS_SDR50:
2293 case MMC_TIMING_UHS_SDR104:
2294 case MMC_TIMING_UHS_DDR50:
2295 case MMC_TIMING_MMC_DDR52:
2296 return true;
2297 }
2298 return false;
2299}
2300
2301static bool sdhci_preset_needed(struct sdhci_host *host, unsigned char timing)
2302{
2303 return !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN) &&
2304 sdhci_timing_has_preset(timing);
2305}
2306
2307static bool sdhci_presetable_values_change(struct sdhci_host *host, struct mmc_ios *ios)
2308{
2309 /*
2310 * Preset Values are: Driver Strength, Clock Generator and SDCLK/RCLK
2311 * Frequency. Check if preset values need to be enabled, or the Driver
2312 * Strength needs updating. Note, clock changes are handled separately.
2313 */
2314 return !host->preset_enabled &&
2315 (sdhci_preset_needed(host, ios->timing) || host->drv_type != ios->drv_type);
2316}
2317
2318void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
2319{
2320 struct sdhci_host *host = mmc_priv(mmc);
2321 bool reinit_uhs = host->reinit_uhs;
2322 bool turning_on_clk = false;
2323 u8 ctrl;
2324
2325 host->reinit_uhs = false;
2326
2327 if (ios->power_mode == MMC_POWER_UNDEFINED)
2328 return;
2329
2330 if (host->flags & SDHCI_DEVICE_DEAD) {
2331 if (!IS_ERR(mmc->supply.vmmc) &&
2332 ios->power_mode == MMC_POWER_OFF)
2333 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
2334 return;
2335 }
2336
2337 /*
2338 * Reset the chip on each power off.
2339 * Should clear out any weird states.
2340 */
2341 if (ios->power_mode == MMC_POWER_OFF) {
2342 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
2343 sdhci_reinit(host);
2344 }
2345
2346 if (host->version >= SDHCI_SPEC_300 &&
2347 (ios->power_mode == MMC_POWER_UP) &&
2348 !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN))
2349 sdhci_enable_preset_value(host, false);
2350
2351 if (!ios->clock || ios->clock != host->clock) {
2352 turning_on_clk = ios->clock && !host->clock;
2353
2354 host->ops->set_clock(host, ios->clock);
2355 host->clock = ios->clock;
2356
2357 if (host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK &&
2358 host->clock) {
2359 host->timeout_clk = mmc->actual_clock ?
2360 mmc->actual_clock / 1000 :
2361 host->clock / 1000;
2362 mmc->max_busy_timeout =
2363 host->ops->get_max_timeout_count ?
2364 host->ops->get_max_timeout_count(host) :
2365 1 << 27;
2366 mmc->max_busy_timeout /= host->timeout_clk;
2367 }
2368 }
2369
2370 if (host->ops->set_power)
2371 host->ops->set_power(host, ios->power_mode, ios->vdd);
2372 else
2373 sdhci_set_power(host, ios->power_mode, ios->vdd);
2374
2375 if (host->ops->platform_send_init_74_clocks)
2376 host->ops->platform_send_init_74_clocks(host, ios->power_mode);
2377
2378 host->ops->set_bus_width(host, ios->bus_width);
2379
2380 /*
2381 * Special case to avoid multiple clock changes during voltage
2382 * switching.
2383 */
2384 if (!reinit_uhs &&
2385 turning_on_clk &&
2386 host->timing == ios->timing &&
2387 host->version >= SDHCI_SPEC_300 &&
2388 !sdhci_presetable_values_change(host, ios))
2389 return;
2390
2391 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
2392
2393 if (!(host->quirks & SDHCI_QUIRK_NO_HISPD_BIT)) {
2394 if (ios->timing == MMC_TIMING_SD_HS ||
2395 ios->timing == MMC_TIMING_MMC_HS ||
2396 ios->timing == MMC_TIMING_MMC_HS400 ||
2397 ios->timing == MMC_TIMING_MMC_HS200 ||
2398 ios->timing == MMC_TIMING_MMC_DDR52 ||
2399 ios->timing == MMC_TIMING_UHS_SDR50 ||
2400 ios->timing == MMC_TIMING_UHS_SDR104 ||
2401 ios->timing == MMC_TIMING_UHS_DDR50 ||
2402 ios->timing == MMC_TIMING_UHS_SDR25)
2403 ctrl |= SDHCI_CTRL_HISPD;
2404 else
2405 ctrl &= ~SDHCI_CTRL_HISPD;
2406 }
2407
2408 if (host->version >= SDHCI_SPEC_300) {
2409 u16 clk, ctrl_2;
2410
2411 /*
2412 * According to SDHCI Spec v3.00, if the Preset Value
2413 * Enable in the Host Control 2 register is set, we
2414 * need to reset SD Clock Enable before changing High
2415 * Speed Enable to avoid generating clock glitches.
2416 */
2417 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
2418 if (clk & SDHCI_CLOCK_CARD_EN) {
2419 clk &= ~SDHCI_CLOCK_CARD_EN;
2420 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
2421 }
2422
2423 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
2424
2425 if (!host->preset_enabled) {
2426 /*
2427 * We only need to set Driver Strength if the
2428 * preset value enable is not set.
2429 */
2430 ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2431 ctrl_2 &= ~SDHCI_CTRL_DRV_TYPE_MASK;
2432 if (ios->drv_type == MMC_SET_DRIVER_TYPE_A)
2433 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_A;
2434 else if (ios->drv_type == MMC_SET_DRIVER_TYPE_B)
2435 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_B;
2436 else if (ios->drv_type == MMC_SET_DRIVER_TYPE_C)
2437 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_C;
2438 else if (ios->drv_type == MMC_SET_DRIVER_TYPE_D)
2439 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_D;
2440 else {
2441 pr_warn("%s: invalid driver type, default to driver type B\n",
2442 mmc_hostname(mmc));
2443 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_B;
2444 }
2445
2446 sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
2447 host->drv_type = ios->drv_type;
2448 }
2449
2450 host->ops->set_uhs_signaling(host, ios->timing);
2451 host->timing = ios->timing;
2452
2453 if (sdhci_preset_needed(host, ios->timing)) {
2454 u16 preset;
2455
2456 sdhci_enable_preset_value(host, true);
2457 preset = sdhci_get_preset_value(host);
2458 ios->drv_type = FIELD_GET(SDHCI_PRESET_DRV_MASK,
2459 preset);
2460 host->drv_type = ios->drv_type;
2461 }
2462
2463 /* Re-enable SD Clock */
2464 host->ops->set_clock(host, host->clock);
2465 } else
2466 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
2467}
2468EXPORT_SYMBOL_GPL(sdhci_set_ios);
2469
2470static int sdhci_get_cd(struct mmc_host *mmc)
2471{
2472 struct sdhci_host *host = mmc_priv(mmc);
2473 int gpio_cd = mmc_gpio_get_cd(mmc);
2474
2475 if (host->flags & SDHCI_DEVICE_DEAD)
2476 return 0;
2477
2478 /* If nonremovable, assume that the card is always present. */
2479 if (!mmc_card_is_removable(mmc))
2480 return 1;
2481
2482 /*
2483 * Try slot gpio detect, if defined it take precedence
2484 * over build in controller functionality
2485 */
2486 if (gpio_cd >= 0)
2487 return !!gpio_cd;
2488
2489 /* If polling, assume that the card is always present. */
2490 if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
2491 return 1;
2492
2493 /* Host native card detect */
2494 return !!(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT);
2495}
2496
2497int sdhci_get_cd_nogpio(struct mmc_host *mmc)
2498{
2499 struct sdhci_host *host = mmc_priv(mmc);
2500 unsigned long flags;
2501 int ret = 0;
2502
2503 spin_lock_irqsave(&host->lock, flags);
2504
2505 if (host->flags & SDHCI_DEVICE_DEAD)
2506 goto out;
2507
2508 ret = !!(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT);
2509out:
2510 spin_unlock_irqrestore(&host->lock, flags);
2511
2512 return ret;
2513}
2514EXPORT_SYMBOL_GPL(sdhci_get_cd_nogpio);
2515
2516static int sdhci_check_ro(struct sdhci_host *host)
2517{
2518 unsigned long flags;
2519 int is_readonly;
2520
2521 spin_lock_irqsave(&host->lock, flags);
2522
2523 if (host->flags & SDHCI_DEVICE_DEAD)
2524 is_readonly = 0;
2525 else if (host->ops->get_ro)
2526 is_readonly = host->ops->get_ro(host);
2527 else if (mmc_can_gpio_ro(host->mmc))
2528 is_readonly = mmc_gpio_get_ro(host->mmc);
2529 else
2530 is_readonly = !(sdhci_readl(host, SDHCI_PRESENT_STATE)
2531 & SDHCI_WRITE_PROTECT);
2532
2533 spin_unlock_irqrestore(&host->lock, flags);
2534
2535 /* This quirk needs to be replaced by a callback-function later */
2536 return host->quirks & SDHCI_QUIRK_INVERTED_WRITE_PROTECT ?
2537 !is_readonly : is_readonly;
2538}
2539
2540#define SAMPLE_COUNT 5
2541
2542static int sdhci_get_ro(struct mmc_host *mmc)
2543{
2544 struct sdhci_host *host = mmc_priv(mmc);
2545 int i, ro_count;
2546
2547 if (!(host->quirks & SDHCI_QUIRK_UNSTABLE_RO_DETECT))
2548 return sdhci_check_ro(host);
2549
2550 ro_count = 0;
2551 for (i = 0; i < SAMPLE_COUNT; i++) {
2552 if (sdhci_check_ro(host)) {
2553 if (++ro_count > SAMPLE_COUNT / 2)
2554 return 1;
2555 }
2556 msleep(30);
2557 }
2558 return 0;
2559}
2560
2561static void sdhci_hw_reset(struct mmc_host *mmc)
2562{
2563 struct sdhci_host *host = mmc_priv(mmc);
2564
2565 if (host->ops && host->ops->hw_reset)
2566 host->ops->hw_reset(host);
2567}
2568
2569static void sdhci_enable_sdio_irq_nolock(struct sdhci_host *host, int enable)
2570{
2571 if (!(host->flags & SDHCI_DEVICE_DEAD)) {
2572 if (enable)
2573 host->ier |= SDHCI_INT_CARD_INT;
2574 else
2575 host->ier &= ~SDHCI_INT_CARD_INT;
2576
2577 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
2578 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
2579 }
2580}
2581
2582void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable)
2583{
2584 struct sdhci_host *host = mmc_priv(mmc);
2585 unsigned long flags;
2586
2587 if (enable)
2588 pm_runtime_get_noresume(mmc_dev(mmc));
2589
2590 spin_lock_irqsave(&host->lock, flags);
2591 sdhci_enable_sdio_irq_nolock(host, enable);
2592 spin_unlock_irqrestore(&host->lock, flags);
2593
2594 if (!enable)
2595 pm_runtime_put_noidle(mmc_dev(mmc));
2596}
2597EXPORT_SYMBOL_GPL(sdhci_enable_sdio_irq);
2598
2599static void sdhci_ack_sdio_irq(struct mmc_host *mmc)
2600{
2601 struct sdhci_host *host = mmc_priv(mmc);
2602 unsigned long flags;
2603
2604 spin_lock_irqsave(&host->lock, flags);
2605 sdhci_enable_sdio_irq_nolock(host, true);
2606 spin_unlock_irqrestore(&host->lock, flags);
2607}
2608
2609int sdhci_start_signal_voltage_switch(struct mmc_host *mmc,
2610 struct mmc_ios *ios)
2611{
2612 struct sdhci_host *host = mmc_priv(mmc);
2613 u16 ctrl;
2614 int ret;
2615
2616 /*
2617 * Signal Voltage Switching is only applicable for Host Controllers
2618 * v3.00 and above.
2619 */
2620 if (host->version < SDHCI_SPEC_300)
2621 return 0;
2622
2623 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2624
2625 switch (ios->signal_voltage) {
2626 case MMC_SIGNAL_VOLTAGE_330:
2627 if (!(host->flags & SDHCI_SIGNALING_330))
2628 return -EINVAL;
2629 /* Set 1.8V Signal Enable in the Host Control2 register to 0 */
2630 ctrl &= ~SDHCI_CTRL_VDD_180;
2631 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2632
2633 if (!IS_ERR(mmc->supply.vqmmc)) {
2634 ret = mmc_regulator_set_vqmmc(mmc, ios);
2635 if (ret < 0) {
2636 pr_warn("%s: Switching to 3.3V signalling voltage failed\n",
2637 mmc_hostname(mmc));
2638 return -EIO;
2639 }
2640 }
2641 /* Wait for 5ms */
2642 usleep_range(5000, 5500);
2643
2644 /* 3.3V regulator output should be stable within 5 ms */
2645 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2646 if (!(ctrl & SDHCI_CTRL_VDD_180))
2647 return 0;
2648
2649 pr_warn("%s: 3.3V regulator output did not become stable\n",
2650 mmc_hostname(mmc));
2651
2652 return -EAGAIN;
2653 case MMC_SIGNAL_VOLTAGE_180:
2654 if (!(host->flags & SDHCI_SIGNALING_180))
2655 return -EINVAL;
2656 if (!IS_ERR(mmc->supply.vqmmc)) {
2657 ret = mmc_regulator_set_vqmmc(mmc, ios);
2658 if (ret < 0) {
2659 pr_warn("%s: Switching to 1.8V signalling voltage failed\n",
2660 mmc_hostname(mmc));
2661 return -EIO;
2662 }
2663 }
2664
2665 /*
2666 * Enable 1.8V Signal Enable in the Host Control2
2667 * register
2668 */
2669 ctrl |= SDHCI_CTRL_VDD_180;
2670 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2671
2672 /* Some controller need to do more when switching */
2673 if (host->ops->voltage_switch)
2674 host->ops->voltage_switch(host);
2675
2676 /* 1.8V regulator output should be stable within 5 ms */
2677 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2678 if (ctrl & SDHCI_CTRL_VDD_180)
2679 return 0;
2680
2681 pr_warn("%s: 1.8V regulator output did not become stable\n",
2682 mmc_hostname(mmc));
2683
2684 return -EAGAIN;
2685 case MMC_SIGNAL_VOLTAGE_120:
2686 if (!(host->flags & SDHCI_SIGNALING_120))
2687 return -EINVAL;
2688 if (!IS_ERR(mmc->supply.vqmmc)) {
2689 ret = mmc_regulator_set_vqmmc(mmc, ios);
2690 if (ret < 0) {
2691 pr_warn("%s: Switching to 1.2V signalling voltage failed\n",
2692 mmc_hostname(mmc));
2693 return -EIO;
2694 }
2695 }
2696 return 0;
2697 default:
2698 /* No signal voltage switch required */
2699 return 0;
2700 }
2701}
2702EXPORT_SYMBOL_GPL(sdhci_start_signal_voltage_switch);
2703
2704static int sdhci_card_busy(struct mmc_host *mmc)
2705{
2706 struct sdhci_host *host = mmc_priv(mmc);
2707 u32 present_state;
2708
2709 /* Check whether DAT[0] is 0 */
2710 present_state = sdhci_readl(host, SDHCI_PRESENT_STATE);
2711
2712 return !(present_state & SDHCI_DATA_0_LVL_MASK);
2713}
2714
2715static int sdhci_prepare_hs400_tuning(struct mmc_host *mmc, struct mmc_ios *ios)
2716{
2717 struct sdhci_host *host = mmc_priv(mmc);
2718 unsigned long flags;
2719
2720 spin_lock_irqsave(&host->lock, flags);
2721 host->flags |= SDHCI_HS400_TUNING;
2722 spin_unlock_irqrestore(&host->lock, flags);
2723
2724 return 0;
2725}
2726
2727void sdhci_start_tuning(struct sdhci_host *host)
2728{
2729 u16 ctrl;
2730
2731 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2732 ctrl |= SDHCI_CTRL_EXEC_TUNING;
2733 if (host->quirks2 & SDHCI_QUIRK2_TUNING_WORK_AROUND)
2734 ctrl |= SDHCI_CTRL_TUNED_CLK;
2735 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2736
2737 /*
2738 * As per the Host Controller spec v3.00, tuning command
2739 * generates Buffer Read Ready interrupt, so enable that.
2740 *
2741 * Note: The spec clearly says that when tuning sequence
2742 * is being performed, the controller does not generate
2743 * interrupts other than Buffer Read Ready interrupt. But
2744 * to make sure we don't hit a controller bug, we _only_
2745 * enable Buffer Read Ready interrupt here.
2746 */
2747 sdhci_writel(host, SDHCI_INT_DATA_AVAIL, SDHCI_INT_ENABLE);
2748 sdhci_writel(host, SDHCI_INT_DATA_AVAIL, SDHCI_SIGNAL_ENABLE);
2749}
2750EXPORT_SYMBOL_GPL(sdhci_start_tuning);
2751
2752void sdhci_end_tuning(struct sdhci_host *host)
2753{
2754 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
2755 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
2756}
2757EXPORT_SYMBOL_GPL(sdhci_end_tuning);
2758
2759void sdhci_reset_tuning(struct sdhci_host *host)
2760{
2761 u16 ctrl;
2762
2763 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2764 ctrl &= ~SDHCI_CTRL_TUNED_CLK;
2765 ctrl &= ~SDHCI_CTRL_EXEC_TUNING;
2766 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2767}
2768EXPORT_SYMBOL_GPL(sdhci_reset_tuning);
2769
2770void sdhci_abort_tuning(struct sdhci_host *host, u32 opcode)
2771{
2772 sdhci_reset_tuning(host);
2773
2774 sdhci_reset_for(host, TUNING_ABORT);
2775
2776 sdhci_end_tuning(host);
2777
2778 mmc_send_abort_tuning(host->mmc, opcode);
2779}
2780EXPORT_SYMBOL_GPL(sdhci_abort_tuning);
2781
2782/*
2783 * We use sdhci_send_tuning() because mmc_send_tuning() is not a good fit. SDHCI
2784 * tuning command does not have a data payload (or rather the hardware does it
2785 * automatically) so mmc_send_tuning() will return -EIO. Also the tuning command
2786 * interrupt setup is different to other commands and there is no timeout
2787 * interrupt so special handling is needed.
2788 */
2789void sdhci_send_tuning(struct sdhci_host *host, u32 opcode)
2790{
2791 struct mmc_host *mmc = host->mmc;
2792 struct mmc_command cmd = {};
2793 struct mmc_request mrq = {};
2794 unsigned long flags;
2795 u32 b = host->sdma_boundary;
2796
2797 spin_lock_irqsave(&host->lock, flags);
2798
2799 cmd.opcode = opcode;
2800 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
2801 cmd.mrq = &mrq;
2802
2803 mrq.cmd = &cmd;
2804 /*
2805 * In response to CMD19, the card sends 64 bytes of tuning
2806 * block to the Host Controller. So we set the block size
2807 * to 64 here.
2808 */
2809 if (cmd.opcode == MMC_SEND_TUNING_BLOCK_HS200 &&
2810 mmc->ios.bus_width == MMC_BUS_WIDTH_8)
2811 sdhci_writew(host, SDHCI_MAKE_BLKSZ(b, 128), SDHCI_BLOCK_SIZE);
2812 else
2813 sdhci_writew(host, SDHCI_MAKE_BLKSZ(b, 64), SDHCI_BLOCK_SIZE);
2814
2815 /*
2816 * The tuning block is sent by the card to the host controller.
2817 * So we set the TRNS_READ bit in the Transfer Mode register.
2818 * This also takes care of setting DMA Enable and Multi Block
2819 * Select in the same register to 0.
2820 */
2821 sdhci_writew(host, SDHCI_TRNS_READ, SDHCI_TRANSFER_MODE);
2822
2823 if (!sdhci_send_command_retry(host, &cmd, flags)) {
2824 spin_unlock_irqrestore(&host->lock, flags);
2825 host->tuning_done = 0;
2826 return;
2827 }
2828
2829 host->cmd = NULL;
2830
2831 sdhci_del_timer(host, &mrq);
2832
2833 host->tuning_done = 0;
2834
2835 spin_unlock_irqrestore(&host->lock, flags);
2836
2837 /* Wait for Buffer Read Ready interrupt */
2838 wait_event_timeout(host->buf_ready_int, (host->tuning_done == 1),
2839 msecs_to_jiffies(50));
2840
2841}
2842EXPORT_SYMBOL_GPL(sdhci_send_tuning);
2843
2844static int __sdhci_execute_tuning(struct sdhci_host *host, u32 opcode)
2845{
2846 int i;
2847
2848 /*
2849 * Issue opcode repeatedly till Execute Tuning is set to 0 or the number
2850 * of loops reaches tuning loop count.
2851 */
2852 for (i = 0; i < host->tuning_loop_count; i++) {
2853 u16 ctrl;
2854
2855 sdhci_send_tuning(host, opcode);
2856
2857 if (!host->tuning_done) {
2858 pr_debug("%s: Tuning timeout, falling back to fixed sampling clock\n",
2859 mmc_hostname(host->mmc));
2860 sdhci_abort_tuning(host, opcode);
2861 return -ETIMEDOUT;
2862 }
2863
2864 /* Spec does not require a delay between tuning cycles */
2865 if (host->tuning_delay > 0)
2866 mdelay(host->tuning_delay);
2867
2868 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2869 if (!(ctrl & SDHCI_CTRL_EXEC_TUNING)) {
2870 if (ctrl & SDHCI_CTRL_TUNED_CLK)
2871 return 0; /* Success! */
2872 break;
2873 }
2874
2875 }
2876
2877 pr_info("%s: Tuning failed, falling back to fixed sampling clock\n",
2878 mmc_hostname(host->mmc));
2879 sdhci_reset_tuning(host);
2880 return -EAGAIN;
2881}
2882
2883int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
2884{
2885 struct sdhci_host *host = mmc_priv(mmc);
2886 int err = 0;
2887 unsigned int tuning_count = 0;
2888 bool hs400_tuning;
2889
2890 hs400_tuning = host->flags & SDHCI_HS400_TUNING;
2891
2892 if (host->tuning_mode == SDHCI_TUNING_MODE_1)
2893 tuning_count = host->tuning_count;
2894
2895 /*
2896 * The Host Controller needs tuning in case of SDR104 and DDR50
2897 * mode, and for SDR50 mode when Use Tuning for SDR50 is set in
2898 * the Capabilities register.
2899 * If the Host Controller supports the HS200 mode then the
2900 * tuning function has to be executed.
2901 */
2902 switch (host->timing) {
2903 /* HS400 tuning is done in HS200 mode */
2904 case MMC_TIMING_MMC_HS400:
2905 err = -EINVAL;
2906 goto out;
2907
2908 case MMC_TIMING_MMC_HS200:
2909 /*
2910 * Periodic re-tuning for HS400 is not expected to be needed, so
2911 * disable it here.
2912 */
2913 if (hs400_tuning)
2914 tuning_count = 0;
2915 break;
2916
2917 case MMC_TIMING_UHS_SDR104:
2918 case MMC_TIMING_UHS_DDR50:
2919 break;
2920
2921 case MMC_TIMING_UHS_SDR50:
2922 if (host->flags & SDHCI_SDR50_NEEDS_TUNING)
2923 break;
2924 fallthrough;
2925
2926 default:
2927 goto out;
2928 }
2929
2930 if (host->ops->platform_execute_tuning) {
2931 err = host->ops->platform_execute_tuning(host, opcode);
2932 goto out;
2933 }
2934
2935 mmc->retune_period = tuning_count;
2936
2937 if (host->tuning_delay < 0)
2938 host->tuning_delay = opcode == MMC_SEND_TUNING_BLOCK;
2939
2940 sdhci_start_tuning(host);
2941
2942 host->tuning_err = __sdhci_execute_tuning(host, opcode);
2943
2944 sdhci_end_tuning(host);
2945out:
2946 host->flags &= ~SDHCI_HS400_TUNING;
2947
2948 return err;
2949}
2950EXPORT_SYMBOL_GPL(sdhci_execute_tuning);
2951
2952static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable)
2953{
2954 /* Host Controller v3.00 defines preset value registers */
2955 if (host->version < SDHCI_SPEC_300)
2956 return;
2957
2958 /*
2959 * We only enable or disable Preset Value if they are not already
2960 * enabled or disabled respectively. Otherwise, we bail out.
2961 */
2962 if (host->preset_enabled != enable) {
2963 u16 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2964
2965 if (enable)
2966 ctrl |= SDHCI_CTRL_PRESET_VAL_ENABLE;
2967 else
2968 ctrl &= ~SDHCI_CTRL_PRESET_VAL_ENABLE;
2969
2970 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2971
2972 if (enable)
2973 host->flags |= SDHCI_PV_ENABLED;
2974 else
2975 host->flags &= ~SDHCI_PV_ENABLED;
2976
2977 host->preset_enabled = enable;
2978 }
2979}
2980
2981static void sdhci_post_req(struct mmc_host *mmc, struct mmc_request *mrq,
2982 int err)
2983{
2984 struct mmc_data *data = mrq->data;
2985
2986 if (data->host_cookie != COOKIE_UNMAPPED)
2987 dma_unmap_sg(mmc_dev(mmc), data->sg, data->sg_len,
2988 mmc_get_dma_dir(data));
2989
2990 data->host_cookie = COOKIE_UNMAPPED;
2991}
2992
2993static void sdhci_pre_req(struct mmc_host *mmc, struct mmc_request *mrq)
2994{
2995 struct sdhci_host *host = mmc_priv(mmc);
2996
2997 mrq->data->host_cookie = COOKIE_UNMAPPED;
2998
2999 /*
3000 * No pre-mapping in the pre hook if we're using the bounce buffer,
3001 * for that we would need two bounce buffers since one buffer is
3002 * in flight when this is getting called.
3003 */
3004 if (host->flags & SDHCI_REQ_USE_DMA && !host->bounce_buffer)
3005 sdhci_pre_dma_transfer(host, mrq->data, COOKIE_PRE_MAPPED);
3006}
3007
3008static void sdhci_error_out_mrqs(struct sdhci_host *host, int err)
3009{
3010 if (host->data_cmd) {
3011 host->data_cmd->error = err;
3012 sdhci_finish_mrq(host, host->data_cmd->mrq);
3013 }
3014
3015 if (host->cmd) {
3016 host->cmd->error = err;
3017 sdhci_finish_mrq(host, host->cmd->mrq);
3018 }
3019}
3020
3021static void sdhci_card_event(struct mmc_host *mmc)
3022{
3023 struct sdhci_host *host = mmc_priv(mmc);
3024 unsigned long flags;
3025 int present;
3026
3027 /* First check if client has provided their own card event */
3028 if (host->ops->card_event)
3029 host->ops->card_event(host);
3030
3031 present = mmc->ops->get_cd(mmc);
3032
3033 spin_lock_irqsave(&host->lock, flags);
3034
3035 /* Check sdhci_has_requests() first in case we are runtime suspended */
3036 if (sdhci_has_requests(host) && !present) {
3037 pr_err("%s: Card removed during transfer!\n",
3038 mmc_hostname(mmc));
3039 pr_err("%s: Resetting controller.\n",
3040 mmc_hostname(mmc));
3041
3042 sdhci_reset_for(host, CARD_REMOVED);
3043
3044 sdhci_error_out_mrqs(host, -ENOMEDIUM);
3045 }
3046
3047 spin_unlock_irqrestore(&host->lock, flags);
3048}
3049
3050static const struct mmc_host_ops sdhci_ops = {
3051 .request = sdhci_request,
3052 .post_req = sdhci_post_req,
3053 .pre_req = sdhci_pre_req,
3054 .set_ios = sdhci_set_ios,
3055 .get_cd = sdhci_get_cd,
3056 .get_ro = sdhci_get_ro,
3057 .card_hw_reset = sdhci_hw_reset,
3058 .enable_sdio_irq = sdhci_enable_sdio_irq,
3059 .ack_sdio_irq = sdhci_ack_sdio_irq,
3060 .start_signal_voltage_switch = sdhci_start_signal_voltage_switch,
3061 .prepare_hs400_tuning = sdhci_prepare_hs400_tuning,
3062 .execute_tuning = sdhci_execute_tuning,
3063 .card_event = sdhci_card_event,
3064 .card_busy = sdhci_card_busy,
3065};
3066
3067/*****************************************************************************\
3068 * *
3069 * Request done *
3070 * *
3071\*****************************************************************************/
3072
3073static bool sdhci_request_done(struct sdhci_host *host)
3074{
3075 unsigned long flags;
3076 struct mmc_request *mrq;
3077 int i;
3078
3079 spin_lock_irqsave(&host->lock, flags);
3080
3081 for (i = 0; i < SDHCI_MAX_MRQS; i++) {
3082 mrq = host->mrqs_done[i];
3083 if (mrq)
3084 break;
3085 }
3086
3087 if (!mrq) {
3088 spin_unlock_irqrestore(&host->lock, flags);
3089 return true;
3090 }
3091
3092 /*
3093 * The controller needs a reset of internal state machines
3094 * upon error conditions.
3095 */
3096 if (sdhci_needs_reset(host, mrq)) {
3097 /*
3098 * Do not finish until command and data lines are available for
3099 * reset. Note there can only be one other mrq, so it cannot
3100 * also be in mrqs_done, otherwise host->cmd and host->data_cmd
3101 * would both be null.
3102 */
3103 if (host->cmd || host->data_cmd) {
3104 spin_unlock_irqrestore(&host->lock, flags);
3105 return true;
3106 }
3107
3108 /* Some controllers need this kick or reset won't work here */
3109 if (host->quirks & SDHCI_QUIRK_CLOCK_BEFORE_RESET)
3110 /* This is to force an update */
3111 host->ops->set_clock(host, host->clock);
3112
3113 sdhci_reset_for(host, REQUEST_ERROR);
3114
3115 host->pending_reset = false;
3116 }
3117
3118 /*
3119 * Always unmap the data buffers if they were mapped by
3120 * sdhci_prepare_data() whenever we finish with a request.
3121 * This avoids leaking DMA mappings on error.
3122 */
3123 if (host->flags & SDHCI_REQ_USE_DMA) {
3124 struct mmc_data *data = mrq->data;
3125
3126 if (host->use_external_dma && data &&
3127 (mrq->cmd->error || data->error)) {
3128 struct dma_chan *chan = sdhci_external_dma_channel(host, data);
3129
3130 host->mrqs_done[i] = NULL;
3131 spin_unlock_irqrestore(&host->lock, flags);
3132 dmaengine_terminate_sync(chan);
3133 spin_lock_irqsave(&host->lock, flags);
3134 sdhci_set_mrq_done(host, mrq);
3135 }
3136
3137 if (data && data->host_cookie == COOKIE_MAPPED) {
3138 if (host->bounce_buffer) {
3139 /*
3140 * On reads, copy the bounced data into the
3141 * sglist
3142 */
3143 if (mmc_get_dma_dir(data) == DMA_FROM_DEVICE) {
3144 unsigned int length = data->bytes_xfered;
3145
3146 if (length > host->bounce_buffer_size) {
3147 pr_err("%s: bounce buffer is %u bytes but DMA claims to have transferred %u bytes\n",
3148 mmc_hostname(host->mmc),
3149 host->bounce_buffer_size,
3150 data->bytes_xfered);
3151 /* Cap it down and continue */
3152 length = host->bounce_buffer_size;
3153 }
3154 dma_sync_single_for_cpu(
3155 mmc_dev(host->mmc),
3156 host->bounce_addr,
3157 host->bounce_buffer_size,
3158 DMA_FROM_DEVICE);
3159 sg_copy_from_buffer(data->sg,
3160 data->sg_len,
3161 host->bounce_buffer,
3162 length);
3163 } else {
3164 /* No copying, just switch ownership */
3165 dma_sync_single_for_cpu(
3166 mmc_dev(host->mmc),
3167 host->bounce_addr,
3168 host->bounce_buffer_size,
3169 mmc_get_dma_dir(data));
3170 }
3171 } else {
3172 /* Unmap the raw data */
3173 dma_unmap_sg(mmc_dev(host->mmc), data->sg,
3174 data->sg_len,
3175 mmc_get_dma_dir(data));
3176 }
3177 data->host_cookie = COOKIE_UNMAPPED;
3178 }
3179 }
3180
3181 host->mrqs_done[i] = NULL;
3182
3183 spin_unlock_irqrestore(&host->lock, flags);
3184
3185 if (host->ops->request_done)
3186 host->ops->request_done(host, mrq);
3187 else
3188 mmc_request_done(host->mmc, mrq);
3189
3190 return false;
3191}
3192
3193static void sdhci_complete_work(struct work_struct *work)
3194{
3195 struct sdhci_host *host = container_of(work, struct sdhci_host,
3196 complete_work);
3197
3198 while (!sdhci_request_done(host))
3199 ;
3200}
3201
3202static void sdhci_timeout_timer(struct timer_list *t)
3203{
3204 struct sdhci_host *host;
3205 unsigned long flags;
3206
3207 host = from_timer(host, t, timer);
3208
3209 spin_lock_irqsave(&host->lock, flags);
3210
3211 if (host->cmd && !sdhci_data_line_cmd(host->cmd)) {
3212 pr_err("%s: Timeout waiting for hardware cmd interrupt.\n",
3213 mmc_hostname(host->mmc));
3214 sdhci_err_stats_inc(host, REQ_TIMEOUT);
3215 sdhci_dumpregs(host);
3216
3217 host->cmd->error = -ETIMEDOUT;
3218 sdhci_finish_mrq(host, host->cmd->mrq);
3219 }
3220
3221 spin_unlock_irqrestore(&host->lock, flags);
3222}
3223
3224static void sdhci_timeout_data_timer(struct timer_list *t)
3225{
3226 struct sdhci_host *host;
3227 unsigned long flags;
3228
3229 host = from_timer(host, t, data_timer);
3230
3231 spin_lock_irqsave(&host->lock, flags);
3232
3233 if (host->data || host->data_cmd ||
3234 (host->cmd && sdhci_data_line_cmd(host->cmd))) {
3235 pr_err("%s: Timeout waiting for hardware interrupt.\n",
3236 mmc_hostname(host->mmc));
3237 sdhci_err_stats_inc(host, REQ_TIMEOUT);
3238 sdhci_dumpregs(host);
3239
3240 if (host->data) {
3241 host->data->error = -ETIMEDOUT;
3242 __sdhci_finish_data(host, true);
3243 queue_work(host->complete_wq, &host->complete_work);
3244 } else if (host->data_cmd) {
3245 host->data_cmd->error = -ETIMEDOUT;
3246 sdhci_finish_mrq(host, host->data_cmd->mrq);
3247 } else {
3248 host->cmd->error = -ETIMEDOUT;
3249 sdhci_finish_mrq(host, host->cmd->mrq);
3250 }
3251 }
3252
3253 spin_unlock_irqrestore(&host->lock, flags);
3254}
3255
3256/*****************************************************************************\
3257 * *
3258 * Interrupt handling *
3259 * *
3260\*****************************************************************************/
3261
3262static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask, u32 *intmask_p)
3263{
3264 /* Handle auto-CMD12 error */
3265 if (intmask & SDHCI_INT_AUTO_CMD_ERR && host->data_cmd) {
3266 struct mmc_request *mrq = host->data_cmd->mrq;
3267 u16 auto_cmd_status = sdhci_readw(host, SDHCI_AUTO_CMD_STATUS);
3268 int data_err_bit = (auto_cmd_status & SDHCI_AUTO_CMD_TIMEOUT) ?
3269 SDHCI_INT_DATA_TIMEOUT :
3270 SDHCI_INT_DATA_CRC;
3271
3272 /* Treat auto-CMD12 error the same as data error */
3273 if (!mrq->sbc && (host->flags & SDHCI_AUTO_CMD12)) {
3274 *intmask_p |= data_err_bit;
3275 return;
3276 }
3277 }
3278
3279 if (!host->cmd) {
3280 /*
3281 * SDHCI recovers from errors by resetting the cmd and data
3282 * circuits. Until that is done, there very well might be more
3283 * interrupts, so ignore them in that case.
3284 */
3285 if (host->pending_reset)
3286 return;
3287 pr_err("%s: Got command interrupt 0x%08x even though no command operation was in progress.\n",
3288 mmc_hostname(host->mmc), (unsigned)intmask);
3289 sdhci_err_stats_inc(host, UNEXPECTED_IRQ);
3290 sdhci_dumpregs(host);
3291 return;
3292 }
3293
3294 if (intmask & (SDHCI_INT_TIMEOUT | SDHCI_INT_CRC |
3295 SDHCI_INT_END_BIT | SDHCI_INT_INDEX)) {
3296 if (intmask & SDHCI_INT_TIMEOUT) {
3297 host->cmd->error = -ETIMEDOUT;
3298 sdhci_err_stats_inc(host, CMD_TIMEOUT);
3299 } else {
3300 host->cmd->error = -EILSEQ;
3301 if (!mmc_op_tuning(host->cmd->opcode))
3302 sdhci_err_stats_inc(host, CMD_CRC);
3303 }
3304 /* Treat data command CRC error the same as data CRC error */
3305 if (host->cmd->data &&
3306 (intmask & (SDHCI_INT_CRC | SDHCI_INT_TIMEOUT)) ==
3307 SDHCI_INT_CRC) {
3308 host->cmd = NULL;
3309 *intmask_p |= SDHCI_INT_DATA_CRC;
3310 return;
3311 }
3312
3313 __sdhci_finish_mrq(host, host->cmd->mrq);
3314 return;
3315 }
3316
3317 /* Handle auto-CMD23 error */
3318 if (intmask & SDHCI_INT_AUTO_CMD_ERR) {
3319 struct mmc_request *mrq = host->cmd->mrq;
3320 u16 auto_cmd_status = sdhci_readw(host, SDHCI_AUTO_CMD_STATUS);
3321 int err = (auto_cmd_status & SDHCI_AUTO_CMD_TIMEOUT) ?
3322 -ETIMEDOUT :
3323 -EILSEQ;
3324
3325 sdhci_err_stats_inc(host, AUTO_CMD);
3326
3327 if (sdhci_auto_cmd23(host, mrq)) {
3328 mrq->sbc->error = err;
3329 __sdhci_finish_mrq(host, mrq);
3330 return;
3331 }
3332 }
3333
3334 if (intmask & SDHCI_INT_RESPONSE)
3335 sdhci_finish_command(host);
3336}
3337
3338static void sdhci_adma_show_error(struct sdhci_host *host)
3339{
3340 void *desc = host->adma_table;
3341 dma_addr_t dma = host->adma_addr;
3342
3343 sdhci_dumpregs(host);
3344
3345 while (true) {
3346 struct sdhci_adma2_64_desc *dma_desc = desc;
3347
3348 if (host->flags & SDHCI_USE_64_BIT_DMA)
3349 SDHCI_DUMP("%08llx: DMA 0x%08x%08x, LEN 0x%04x, Attr=0x%02x\n",
3350 (unsigned long long)dma,
3351 le32_to_cpu(dma_desc->addr_hi),
3352 le32_to_cpu(dma_desc->addr_lo),
3353 le16_to_cpu(dma_desc->len),
3354 le16_to_cpu(dma_desc->cmd));
3355 else
3356 SDHCI_DUMP("%08llx: DMA 0x%08x, LEN 0x%04x, Attr=0x%02x\n",
3357 (unsigned long long)dma,
3358 le32_to_cpu(dma_desc->addr_lo),
3359 le16_to_cpu(dma_desc->len),
3360 le16_to_cpu(dma_desc->cmd));
3361
3362 desc += host->desc_sz;
3363 dma += host->desc_sz;
3364
3365 if (dma_desc->cmd & cpu_to_le16(ADMA2_END))
3366 break;
3367 }
3368}
3369
3370static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
3371{
3372 /*
3373 * CMD19 generates _only_ Buffer Read Ready interrupt if
3374 * use sdhci_send_tuning.
3375 * Need to exclude this case: PIO mode and use mmc_send_tuning,
3376 * If not, sdhci_transfer_pio will never be called, make the
3377 * SDHCI_INT_DATA_AVAIL always there, stuck in irq storm.
3378 */
3379 if (intmask & SDHCI_INT_DATA_AVAIL && !host->data) {
3380 if (mmc_op_tuning(SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND)))) {
3381 host->tuning_done = 1;
3382 wake_up(&host->buf_ready_int);
3383 return;
3384 }
3385 }
3386
3387 if (!host->data) {
3388 struct mmc_command *data_cmd = host->data_cmd;
3389
3390 /*
3391 * The "data complete" interrupt is also used to
3392 * indicate that a busy state has ended. See comment
3393 * above in sdhci_cmd_irq().
3394 */
3395 if (data_cmd && (data_cmd->flags & MMC_RSP_BUSY)) {
3396 if (intmask & SDHCI_INT_DATA_TIMEOUT) {
3397 host->data_cmd = NULL;
3398 data_cmd->error = -ETIMEDOUT;
3399 sdhci_err_stats_inc(host, CMD_TIMEOUT);
3400 __sdhci_finish_mrq(host, data_cmd->mrq);
3401 return;
3402 }
3403 if (intmask & SDHCI_INT_DATA_END) {
3404 host->data_cmd = NULL;
3405 /*
3406 * Some cards handle busy-end interrupt
3407 * before the command completed, so make
3408 * sure we do things in the proper order.
3409 */
3410 if (host->cmd == data_cmd)
3411 return;
3412
3413 __sdhci_finish_mrq(host, data_cmd->mrq);
3414 return;
3415 }
3416 }
3417
3418 /*
3419 * SDHCI recovers from errors by resetting the cmd and data
3420 * circuits. Until that is done, there very well might be more
3421 * interrupts, so ignore them in that case.
3422 */
3423 if (host->pending_reset)
3424 return;
3425
3426 pr_err("%s: Got data interrupt 0x%08x even though no data operation was in progress.\n",
3427 mmc_hostname(host->mmc), (unsigned)intmask);
3428 sdhci_err_stats_inc(host, UNEXPECTED_IRQ);
3429 sdhci_dumpregs(host);
3430
3431 return;
3432 }
3433
3434 if (intmask & SDHCI_INT_DATA_TIMEOUT) {
3435 host->data->error = -ETIMEDOUT;
3436 sdhci_err_stats_inc(host, DAT_TIMEOUT);
3437 } else if (intmask & SDHCI_INT_DATA_END_BIT) {
3438 host->data->error = -EILSEQ;
3439 if (!mmc_op_tuning(SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND))))
3440 sdhci_err_stats_inc(host, DAT_CRC);
3441 } else if ((intmask & SDHCI_INT_DATA_CRC) &&
3442 SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND))
3443 != MMC_BUS_TEST_R) {
3444 host->data->error = -EILSEQ;
3445 if (!mmc_op_tuning(SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND))))
3446 sdhci_err_stats_inc(host, DAT_CRC);
3447 } else if (intmask & SDHCI_INT_ADMA_ERROR) {
3448 pr_err("%s: ADMA error: 0x%08x\n", mmc_hostname(host->mmc),
3449 intmask);
3450 sdhci_adma_show_error(host);
3451 sdhci_err_stats_inc(host, ADMA);
3452 host->data->error = -EIO;
3453 if (host->ops->adma_workaround)
3454 host->ops->adma_workaround(host, intmask);
3455 }
3456
3457 if (host->data->error)
3458 sdhci_finish_data(host);
3459 else {
3460 if (intmask & (SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL))
3461 sdhci_transfer_pio(host);
3462
3463 /*
3464 * We currently don't do anything fancy with DMA
3465 * boundaries, but as we can't disable the feature
3466 * we need to at least restart the transfer.
3467 *
3468 * According to the spec sdhci_readl(host, SDHCI_DMA_ADDRESS)
3469 * should return a valid address to continue from, but as
3470 * some controllers are faulty, don't trust them.
3471 */
3472 if (intmask & SDHCI_INT_DMA_END) {
3473 dma_addr_t dmastart, dmanow;
3474
3475 dmastart = sdhci_sdma_address(host);
3476 dmanow = dmastart + host->data->bytes_xfered;
3477 /*
3478 * Force update to the next DMA block boundary.
3479 */
3480 dmanow = (dmanow &
3481 ~((dma_addr_t)SDHCI_DEFAULT_BOUNDARY_SIZE - 1)) +
3482 SDHCI_DEFAULT_BOUNDARY_SIZE;
3483 host->data->bytes_xfered = dmanow - dmastart;
3484 DBG("DMA base %pad, transferred 0x%06x bytes, next %pad\n",
3485 &dmastart, host->data->bytes_xfered, &dmanow);
3486 sdhci_set_sdma_addr(host, dmanow);
3487 }
3488
3489 if (intmask & SDHCI_INT_DATA_END) {
3490 if (host->cmd == host->data_cmd) {
3491 /*
3492 * Data managed to finish before the
3493 * command completed. Make sure we do
3494 * things in the proper order.
3495 */
3496 host->data_early = 1;
3497 } else {
3498 sdhci_finish_data(host);
3499 }
3500 }
3501 }
3502}
3503
3504static inline bool sdhci_defer_done(struct sdhci_host *host,
3505 struct mmc_request *mrq)
3506{
3507 struct mmc_data *data = mrq->data;
3508
3509 return host->pending_reset || host->always_defer_done ||
3510 ((host->flags & SDHCI_REQ_USE_DMA) && data &&
3511 data->host_cookie == COOKIE_MAPPED);
3512}
3513
3514static irqreturn_t sdhci_irq(int irq, void *dev_id)
3515{
3516 struct mmc_request *mrqs_done[SDHCI_MAX_MRQS] = {0};
3517 irqreturn_t result = IRQ_NONE;
3518 struct sdhci_host *host = dev_id;
3519 u32 intmask, mask, unexpected = 0;
3520 int max_loops = 16;
3521 int i;
3522
3523 spin_lock(&host->lock);
3524
3525 if (host->runtime_suspended) {
3526 spin_unlock(&host->lock);
3527 return IRQ_NONE;
3528 }
3529
3530 intmask = sdhci_readl(host, SDHCI_INT_STATUS);
3531 if (!intmask || intmask == 0xffffffff) {
3532 result = IRQ_NONE;
3533 goto out;
3534 }
3535
3536 do {
3537 DBG("IRQ status 0x%08x\n", intmask);
3538
3539 if (host->ops->irq) {
3540 intmask = host->ops->irq(host, intmask);
3541 if (!intmask)
3542 goto cont;
3543 }
3544
3545 /* Clear selected interrupts. */
3546 mask = intmask & (SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK |
3547 SDHCI_INT_BUS_POWER);
3548 sdhci_writel(host, mask, SDHCI_INT_STATUS);
3549
3550 if (intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
3551 u32 present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
3552 SDHCI_CARD_PRESENT;
3553
3554 /*
3555 * There is a observation on i.mx esdhc. INSERT
3556 * bit will be immediately set again when it gets
3557 * cleared, if a card is inserted. We have to mask
3558 * the irq to prevent interrupt storm which will
3559 * freeze the system. And the REMOVE gets the
3560 * same situation.
3561 *
3562 * More testing are needed here to ensure it works
3563 * for other platforms though.
3564 */
3565 host->ier &= ~(SDHCI_INT_CARD_INSERT |
3566 SDHCI_INT_CARD_REMOVE);
3567 host->ier |= present ? SDHCI_INT_CARD_REMOVE :
3568 SDHCI_INT_CARD_INSERT;
3569 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
3570 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
3571
3572 sdhci_writel(host, intmask & (SDHCI_INT_CARD_INSERT |
3573 SDHCI_INT_CARD_REMOVE), SDHCI_INT_STATUS);
3574
3575 host->thread_isr |= intmask & (SDHCI_INT_CARD_INSERT |
3576 SDHCI_INT_CARD_REMOVE);
3577 result = IRQ_WAKE_THREAD;
3578 }
3579
3580 if (intmask & SDHCI_INT_CMD_MASK)
3581 sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK, &intmask);
3582
3583 if (intmask & SDHCI_INT_DATA_MASK)
3584 sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK);
3585
3586 if (intmask & SDHCI_INT_BUS_POWER)
3587 pr_err("%s: Card is consuming too much power!\n",
3588 mmc_hostname(host->mmc));
3589
3590 if (intmask & SDHCI_INT_RETUNE)
3591 mmc_retune_needed(host->mmc);
3592
3593 if ((intmask & SDHCI_INT_CARD_INT) &&
3594 (host->ier & SDHCI_INT_CARD_INT)) {
3595 sdhci_enable_sdio_irq_nolock(host, false);
3596 sdio_signal_irq(host->mmc);
3597 }
3598
3599 intmask &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE |
3600 SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK |
3601 SDHCI_INT_ERROR | SDHCI_INT_BUS_POWER |
3602 SDHCI_INT_RETUNE | SDHCI_INT_CARD_INT);
3603
3604 if (intmask) {
3605 unexpected |= intmask;
3606 sdhci_writel(host, intmask, SDHCI_INT_STATUS);
3607 }
3608cont:
3609 if (result == IRQ_NONE)
3610 result = IRQ_HANDLED;
3611
3612 intmask = sdhci_readl(host, SDHCI_INT_STATUS);
3613 } while (intmask && --max_loops);
3614
3615 /* Determine if mrqs can be completed immediately */
3616 for (i = 0; i < SDHCI_MAX_MRQS; i++) {
3617 struct mmc_request *mrq = host->mrqs_done[i];
3618
3619 if (!mrq)
3620 continue;
3621
3622 if (sdhci_defer_done(host, mrq)) {
3623 result = IRQ_WAKE_THREAD;
3624 } else {
3625 mrqs_done[i] = mrq;
3626 host->mrqs_done[i] = NULL;
3627 }
3628 }
3629out:
3630 if (host->deferred_cmd)
3631 result = IRQ_WAKE_THREAD;
3632
3633 spin_unlock(&host->lock);
3634
3635 /* Process mrqs ready for immediate completion */
3636 for (i = 0; i < SDHCI_MAX_MRQS; i++) {
3637 if (!mrqs_done[i])
3638 continue;
3639
3640 if (host->ops->request_done)
3641 host->ops->request_done(host, mrqs_done[i]);
3642 else
3643 mmc_request_done(host->mmc, mrqs_done[i]);
3644 }
3645
3646 if (unexpected) {
3647 pr_err("%s: Unexpected interrupt 0x%08x.\n",
3648 mmc_hostname(host->mmc), unexpected);
3649 sdhci_err_stats_inc(host, UNEXPECTED_IRQ);
3650 sdhci_dumpregs(host);
3651 }
3652
3653 return result;
3654}
3655
3656static irqreturn_t sdhci_thread_irq(int irq, void *dev_id)
3657{
3658 struct sdhci_host *host = dev_id;
3659 struct mmc_command *cmd;
3660 unsigned long flags;
3661 u32 isr;
3662
3663 while (!sdhci_request_done(host))
3664 ;
3665
3666 spin_lock_irqsave(&host->lock, flags);
3667
3668 isr = host->thread_isr;
3669 host->thread_isr = 0;
3670
3671 cmd = host->deferred_cmd;
3672 if (cmd && !sdhci_send_command_retry(host, cmd, flags))
3673 sdhci_finish_mrq(host, cmd->mrq);
3674
3675 spin_unlock_irqrestore(&host->lock, flags);
3676
3677 if (isr & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
3678 struct mmc_host *mmc = host->mmc;
3679
3680 mmc->ops->card_event(mmc);
3681 mmc_detect_change(mmc, msecs_to_jiffies(200));
3682 }
3683
3684 return IRQ_HANDLED;
3685}
3686
3687/*****************************************************************************\
3688 * *
3689 * Suspend/resume *
3690 * *
3691\*****************************************************************************/
3692
3693#ifdef CONFIG_PM
3694
3695static bool sdhci_cd_irq_can_wakeup(struct sdhci_host *host)
3696{
3697 return mmc_card_is_removable(host->mmc) &&
3698 !(host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) &&
3699 !mmc_can_gpio_cd(host->mmc);
3700}
3701
3702/*
3703 * To enable wakeup events, the corresponding events have to be enabled in
3704 * the Interrupt Status Enable register too. See 'Table 1-6: Wakeup Signal
3705 * Table' in the SD Host Controller Standard Specification.
3706 * It is useless to restore SDHCI_INT_ENABLE state in
3707 * sdhci_disable_irq_wakeups() since it will be set by
3708 * sdhci_enable_card_detection() or sdhci_init().
3709 */
3710static bool sdhci_enable_irq_wakeups(struct sdhci_host *host)
3711{
3712 u8 mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE |
3713 SDHCI_WAKE_ON_INT;
3714 u32 irq_val = 0;
3715 u8 wake_val = 0;
3716 u8 val;
3717
3718 if (sdhci_cd_irq_can_wakeup(host)) {
3719 wake_val |= SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE;
3720 irq_val |= SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE;
3721 }
3722
3723 if (mmc_card_wake_sdio_irq(host->mmc)) {
3724 wake_val |= SDHCI_WAKE_ON_INT;
3725 irq_val |= SDHCI_INT_CARD_INT;
3726 }
3727
3728 if (!irq_val)
3729 return false;
3730
3731 val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
3732 val &= ~mask;
3733 val |= wake_val;
3734 sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
3735
3736 sdhci_writel(host, irq_val, SDHCI_INT_ENABLE);
3737
3738 host->irq_wake_enabled = !enable_irq_wake(host->irq);
3739
3740 return host->irq_wake_enabled;
3741}
3742
3743static void sdhci_disable_irq_wakeups(struct sdhci_host *host)
3744{
3745 u8 val;
3746 u8 mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE
3747 | SDHCI_WAKE_ON_INT;
3748
3749 val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
3750 val &= ~mask;
3751 sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
3752
3753 disable_irq_wake(host->irq);
3754
3755 host->irq_wake_enabled = false;
3756}
3757
3758int sdhci_suspend_host(struct sdhci_host *host)
3759{
3760 sdhci_disable_card_detection(host);
3761
3762 mmc_retune_timer_stop(host->mmc);
3763
3764 if (!device_may_wakeup(mmc_dev(host->mmc)) ||
3765 !sdhci_enable_irq_wakeups(host)) {
3766 host->ier = 0;
3767 sdhci_writel(host, 0, SDHCI_INT_ENABLE);
3768 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
3769 free_irq(host->irq, host);
3770 }
3771
3772 return 0;
3773}
3774
3775EXPORT_SYMBOL_GPL(sdhci_suspend_host);
3776
3777int sdhci_resume_host(struct sdhci_host *host)
3778{
3779 struct mmc_host *mmc = host->mmc;
3780 int ret = 0;
3781
3782 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
3783 if (host->ops->enable_dma)
3784 host->ops->enable_dma(host);
3785 }
3786
3787 if ((mmc->pm_flags & MMC_PM_KEEP_POWER) &&
3788 (host->quirks2 & SDHCI_QUIRK2_HOST_OFF_CARD_ON)) {
3789 /* Card keeps power but host controller does not */
3790 sdhci_init(host, 0);
3791 host->pwr = 0;
3792 host->clock = 0;
3793 host->reinit_uhs = true;
3794 mmc->ops->set_ios(mmc, &mmc->ios);
3795 } else {
3796 sdhci_init(host, (mmc->pm_flags & MMC_PM_KEEP_POWER));
3797 }
3798
3799 if (host->irq_wake_enabled) {
3800 sdhci_disable_irq_wakeups(host);
3801 } else {
3802 ret = request_threaded_irq(host->irq, sdhci_irq,
3803 sdhci_thread_irq, IRQF_SHARED,
3804 mmc_hostname(mmc), host);
3805 if (ret)
3806 return ret;
3807 }
3808
3809 sdhci_enable_card_detection(host);
3810
3811 return ret;
3812}
3813
3814EXPORT_SYMBOL_GPL(sdhci_resume_host);
3815
3816int sdhci_runtime_suspend_host(struct sdhci_host *host)
3817{
3818 unsigned long flags;
3819
3820 mmc_retune_timer_stop(host->mmc);
3821
3822 spin_lock_irqsave(&host->lock, flags);
3823 host->ier &= SDHCI_INT_CARD_INT;
3824 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
3825 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
3826 spin_unlock_irqrestore(&host->lock, flags);
3827
3828 synchronize_hardirq(host->irq);
3829
3830 spin_lock_irqsave(&host->lock, flags);
3831 host->runtime_suspended = true;
3832 spin_unlock_irqrestore(&host->lock, flags);
3833
3834 return 0;
3835}
3836EXPORT_SYMBOL_GPL(sdhci_runtime_suspend_host);
3837
3838int sdhci_runtime_resume_host(struct sdhci_host *host, int soft_reset)
3839{
3840 struct mmc_host *mmc = host->mmc;
3841 unsigned long flags;
3842 int host_flags = host->flags;
3843
3844 if (host_flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
3845 if (host->ops->enable_dma)
3846 host->ops->enable_dma(host);
3847 }
3848
3849 sdhci_init(host, soft_reset);
3850
3851 if (mmc->ios.power_mode != MMC_POWER_UNDEFINED &&
3852 mmc->ios.power_mode != MMC_POWER_OFF) {
3853 /* Force clock and power re-program */
3854 host->pwr = 0;
3855 host->clock = 0;
3856 host->reinit_uhs = true;
3857 mmc->ops->start_signal_voltage_switch(mmc, &mmc->ios);
3858 mmc->ops->set_ios(mmc, &mmc->ios);
3859
3860 if ((host_flags & SDHCI_PV_ENABLED) &&
3861 !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN)) {
3862 spin_lock_irqsave(&host->lock, flags);
3863 sdhci_enable_preset_value(host, true);
3864 spin_unlock_irqrestore(&host->lock, flags);
3865 }
3866
3867 if ((mmc->caps2 & MMC_CAP2_HS400_ES) &&
3868 mmc->ops->hs400_enhanced_strobe)
3869 mmc->ops->hs400_enhanced_strobe(mmc, &mmc->ios);
3870 }
3871
3872 spin_lock_irqsave(&host->lock, flags);
3873
3874 host->runtime_suspended = false;
3875
3876 /* Enable SDIO IRQ */
3877 if (sdio_irq_claimed(mmc))
3878 sdhci_enable_sdio_irq_nolock(host, true);
3879
3880 /* Enable Card Detection */
3881 sdhci_enable_card_detection(host);
3882
3883 spin_unlock_irqrestore(&host->lock, flags);
3884
3885 return 0;
3886}
3887EXPORT_SYMBOL_GPL(sdhci_runtime_resume_host);
3888
3889#endif /* CONFIG_PM */
3890
3891/*****************************************************************************\
3892 * *
3893 * Command Queue Engine (CQE) helpers *
3894 * *
3895\*****************************************************************************/
3896
3897void sdhci_cqe_enable(struct mmc_host *mmc)
3898{
3899 struct sdhci_host *host = mmc_priv(mmc);
3900 unsigned long flags;
3901 u8 ctrl;
3902
3903 spin_lock_irqsave(&host->lock, flags);
3904
3905 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
3906 ctrl &= ~SDHCI_CTRL_DMA_MASK;
3907 /*
3908 * Host from V4.10 supports ADMA3 DMA type.
3909 * ADMA3 performs integrated descriptor which is more suitable
3910 * for cmd queuing to fetch both command and transfer descriptors.
3911 */
3912 if (host->v4_mode && (host->caps1 & SDHCI_CAN_DO_ADMA3))
3913 ctrl |= SDHCI_CTRL_ADMA3;
3914 else if (host->flags & SDHCI_USE_64_BIT_DMA)
3915 ctrl |= SDHCI_CTRL_ADMA64;
3916 else
3917 ctrl |= SDHCI_CTRL_ADMA32;
3918 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
3919
3920 sdhci_writew(host, SDHCI_MAKE_BLKSZ(host->sdma_boundary, 512),
3921 SDHCI_BLOCK_SIZE);
3922
3923 /* Set maximum timeout */
3924 sdhci_set_timeout(host, NULL);
3925
3926 host->ier = host->cqe_ier;
3927
3928 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
3929 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
3930
3931 host->cqe_on = true;
3932
3933 pr_debug("%s: sdhci: CQE on, IRQ mask %#x, IRQ status %#x\n",
3934 mmc_hostname(mmc), host->ier,
3935 sdhci_readl(host, SDHCI_INT_STATUS));
3936
3937 spin_unlock_irqrestore(&host->lock, flags);
3938}
3939EXPORT_SYMBOL_GPL(sdhci_cqe_enable);
3940
3941void sdhci_cqe_disable(struct mmc_host *mmc, bool recovery)
3942{
3943 struct sdhci_host *host = mmc_priv(mmc);
3944 unsigned long flags;
3945
3946 spin_lock_irqsave(&host->lock, flags);
3947
3948 sdhci_set_default_irqs(host);
3949
3950 host->cqe_on = false;
3951
3952 if (recovery)
3953 sdhci_reset_for(host, CQE_RECOVERY);
3954
3955 pr_debug("%s: sdhci: CQE off, IRQ mask %#x, IRQ status %#x\n",
3956 mmc_hostname(mmc), host->ier,
3957 sdhci_readl(host, SDHCI_INT_STATUS));
3958
3959 spin_unlock_irqrestore(&host->lock, flags);
3960}
3961EXPORT_SYMBOL_GPL(sdhci_cqe_disable);
3962
3963bool sdhci_cqe_irq(struct sdhci_host *host, u32 intmask, int *cmd_error,
3964 int *data_error)
3965{
3966 u32 mask;
3967
3968 if (!host->cqe_on)
3969 return false;
3970
3971 if (intmask & (SDHCI_INT_INDEX | SDHCI_INT_END_BIT | SDHCI_INT_CRC)) {
3972 *cmd_error = -EILSEQ;
3973 if (!mmc_op_tuning(SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND))))
3974 sdhci_err_stats_inc(host, CMD_CRC);
3975 } else if (intmask & SDHCI_INT_TIMEOUT) {
3976 *cmd_error = -ETIMEDOUT;
3977 sdhci_err_stats_inc(host, CMD_TIMEOUT);
3978 } else
3979 *cmd_error = 0;
3980
3981 if (intmask & (SDHCI_INT_DATA_END_BIT | SDHCI_INT_DATA_CRC)) {
3982 *data_error = -EILSEQ;
3983 if (!mmc_op_tuning(SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND))))
3984 sdhci_err_stats_inc(host, DAT_CRC);
3985 } else if (intmask & SDHCI_INT_DATA_TIMEOUT) {
3986 *data_error = -ETIMEDOUT;
3987 sdhci_err_stats_inc(host, DAT_TIMEOUT);
3988 } else if (intmask & SDHCI_INT_ADMA_ERROR) {
3989 *data_error = -EIO;
3990 sdhci_err_stats_inc(host, ADMA);
3991 } else
3992 *data_error = 0;
3993
3994 /* Clear selected interrupts. */
3995 mask = intmask & host->cqe_ier;
3996 sdhci_writel(host, mask, SDHCI_INT_STATUS);
3997
3998 if (intmask & SDHCI_INT_BUS_POWER)
3999 pr_err("%s: Card is consuming too much power!\n",
4000 mmc_hostname(host->mmc));
4001
4002 intmask &= ~(host->cqe_ier | SDHCI_INT_ERROR);
4003 if (intmask) {
4004 sdhci_writel(host, intmask, SDHCI_INT_STATUS);
4005 pr_err("%s: CQE: Unexpected interrupt 0x%08x.\n",
4006 mmc_hostname(host->mmc), intmask);
4007 sdhci_err_stats_inc(host, UNEXPECTED_IRQ);
4008 sdhci_dumpregs(host);
4009 }
4010
4011 return true;
4012}
4013EXPORT_SYMBOL_GPL(sdhci_cqe_irq);
4014
4015/*****************************************************************************\
4016 * *
4017 * Device allocation/registration *
4018 * *
4019\*****************************************************************************/
4020
4021struct sdhci_host *sdhci_alloc_host(struct device *dev,
4022 size_t priv_size)
4023{
4024 struct mmc_host *mmc;
4025 struct sdhci_host *host;
4026
4027 WARN_ON(dev == NULL);
4028
4029 mmc = mmc_alloc_host(sizeof(struct sdhci_host) + priv_size, dev);
4030 if (!mmc)
4031 return ERR_PTR(-ENOMEM);
4032
4033 host = mmc_priv(mmc);
4034 host->mmc = mmc;
4035 host->mmc_host_ops = sdhci_ops;
4036 mmc->ops = &host->mmc_host_ops;
4037
4038 host->flags = SDHCI_SIGNALING_330;
4039
4040 host->cqe_ier = SDHCI_CQE_INT_MASK;
4041 host->cqe_err_ier = SDHCI_CQE_INT_ERR_MASK;
4042
4043 host->tuning_delay = -1;
4044 host->tuning_loop_count = MAX_TUNING_LOOP;
4045
4046 host->sdma_boundary = SDHCI_DEFAULT_BOUNDARY_ARG;
4047
4048 /*
4049 * The DMA table descriptor count is calculated as the maximum
4050 * number of segments times 2, to allow for an alignment
4051 * descriptor for each segment, plus 1 for a nop end descriptor.
4052 */
4053 host->adma_table_cnt = SDHCI_MAX_SEGS * 2 + 1;
4054 host->max_adma = 65536;
4055
4056 host->max_timeout_count = 0xE;
4057
4058 return host;
4059}
4060
4061EXPORT_SYMBOL_GPL(sdhci_alloc_host);
4062
4063static int sdhci_set_dma_mask(struct sdhci_host *host)
4064{
4065 struct mmc_host *mmc = host->mmc;
4066 struct device *dev = mmc_dev(mmc);
4067 int ret = -EINVAL;
4068
4069 if (host->quirks2 & SDHCI_QUIRK2_BROKEN_64_BIT_DMA)
4070 host->flags &= ~SDHCI_USE_64_BIT_DMA;
4071
4072 /* Try 64-bit mask if hardware is capable of it */
4073 if (host->flags & SDHCI_USE_64_BIT_DMA) {
4074 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
4075 if (ret) {
4076 pr_warn("%s: Failed to set 64-bit DMA mask.\n",
4077 mmc_hostname(mmc));
4078 host->flags &= ~SDHCI_USE_64_BIT_DMA;
4079 }
4080 }
4081
4082 /* 32-bit mask as default & fallback */
4083 if (ret) {
4084 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
4085 if (ret)
4086 pr_warn("%s: Failed to set 32-bit DMA mask.\n",
4087 mmc_hostname(mmc));
4088 }
4089
4090 return ret;
4091}
4092
4093void __sdhci_read_caps(struct sdhci_host *host, const u16 *ver,
4094 const u32 *caps, const u32 *caps1)
4095{
4096 u16 v;
4097 u64 dt_caps_mask = 0;
4098 u64 dt_caps = 0;
4099
4100 if (host->read_caps)
4101 return;
4102
4103 host->read_caps = true;
4104
4105 if (debug_quirks)
4106 host->quirks = debug_quirks;
4107
4108 if (debug_quirks2)
4109 host->quirks2 = debug_quirks2;
4110
4111 sdhci_reset_for_all(host);
4112
4113 if (host->v4_mode)
4114 sdhci_do_enable_v4_mode(host);
4115
4116 device_property_read_u64(mmc_dev(host->mmc),
4117 "sdhci-caps-mask", &dt_caps_mask);
4118 device_property_read_u64(mmc_dev(host->mmc),
4119 "sdhci-caps", &dt_caps);
4120
4121 v = ver ? *ver : sdhci_readw(host, SDHCI_HOST_VERSION);
4122 host->version = (v & SDHCI_SPEC_VER_MASK) >> SDHCI_SPEC_VER_SHIFT;
4123
4124 if (host->quirks & SDHCI_QUIRK_MISSING_CAPS)
4125 return;
4126
4127 if (caps) {
4128 host->caps = *caps;
4129 } else {
4130 host->caps = sdhci_readl(host, SDHCI_CAPABILITIES);
4131 host->caps &= ~lower_32_bits(dt_caps_mask);
4132 host->caps |= lower_32_bits(dt_caps);
4133 }
4134
4135 if (host->version < SDHCI_SPEC_300)
4136 return;
4137
4138 if (caps1) {
4139 host->caps1 = *caps1;
4140 } else {
4141 host->caps1 = sdhci_readl(host, SDHCI_CAPABILITIES_1);
4142 host->caps1 &= ~upper_32_bits(dt_caps_mask);
4143 host->caps1 |= upper_32_bits(dt_caps);
4144 }
4145}
4146EXPORT_SYMBOL_GPL(__sdhci_read_caps);
4147
4148static void sdhci_allocate_bounce_buffer(struct sdhci_host *host)
4149{
4150 struct mmc_host *mmc = host->mmc;
4151 unsigned int max_blocks;
4152 unsigned int bounce_size;
4153 int ret;
4154
4155 /*
4156 * Cap the bounce buffer at 64KB. Using a bigger bounce buffer
4157 * has diminishing returns, this is probably because SD/MMC
4158 * cards are usually optimized to handle this size of requests.
4159 */
4160 bounce_size = SZ_64K;
4161 /*
4162 * Adjust downwards to maximum request size if this is less
4163 * than our segment size, else hammer down the maximum
4164 * request size to the maximum buffer size.
4165 */
4166 if (mmc->max_req_size < bounce_size)
4167 bounce_size = mmc->max_req_size;
4168 max_blocks = bounce_size / 512;
4169
4170 /*
4171 * When we just support one segment, we can get significant
4172 * speedups by the help of a bounce buffer to group scattered
4173 * reads/writes together.
4174 */
4175 host->bounce_buffer = devm_kmalloc(mmc_dev(mmc),
4176 bounce_size,
4177 GFP_KERNEL);
4178 if (!host->bounce_buffer) {
4179 pr_err("%s: failed to allocate %u bytes for bounce buffer, falling back to single segments\n",
4180 mmc_hostname(mmc),
4181 bounce_size);
4182 /*
4183 * Exiting with zero here makes sure we proceed with
4184 * mmc->max_segs == 1.
4185 */
4186 return;
4187 }
4188
4189 host->bounce_addr = dma_map_single(mmc_dev(mmc),
4190 host->bounce_buffer,
4191 bounce_size,
4192 DMA_BIDIRECTIONAL);
4193 ret = dma_mapping_error(mmc_dev(mmc), host->bounce_addr);
4194 if (ret) {
4195 devm_kfree(mmc_dev(mmc), host->bounce_buffer);
4196 host->bounce_buffer = NULL;
4197 /* Again fall back to max_segs == 1 */
4198 return;
4199 }
4200
4201 host->bounce_buffer_size = bounce_size;
4202
4203 /* Lie about this since we're bouncing */
4204 mmc->max_segs = max_blocks;
4205 mmc->max_seg_size = bounce_size;
4206 mmc->max_req_size = bounce_size;
4207
4208 pr_info("%s bounce up to %u segments into one, max segment size %u bytes\n",
4209 mmc_hostname(mmc), max_blocks, bounce_size);
4210}
4211
4212static inline bool sdhci_can_64bit_dma(struct sdhci_host *host)
4213{
4214 /*
4215 * According to SD Host Controller spec v4.10, bit[27] added from
4216 * version 4.10 in Capabilities Register is used as 64-bit System
4217 * Address support for V4 mode.
4218 */
4219 if (host->version >= SDHCI_SPEC_410 && host->v4_mode)
4220 return host->caps & SDHCI_CAN_64BIT_V4;
4221
4222 return host->caps & SDHCI_CAN_64BIT;
4223}
4224
4225int sdhci_setup_host(struct sdhci_host *host)
4226{
4227 struct mmc_host *mmc;
4228 u32 max_current_caps;
4229 unsigned int ocr_avail;
4230 unsigned int override_timeout_clk;
4231 u32 max_clk;
4232 int ret = 0;
4233 bool enable_vqmmc = false;
4234
4235 WARN_ON(host == NULL);
4236 if (host == NULL)
4237 return -EINVAL;
4238
4239 mmc = host->mmc;
4240
4241 /*
4242 * If there are external regulators, get them. Note this must be done
4243 * early before resetting the host and reading the capabilities so that
4244 * the host can take the appropriate action if regulators are not
4245 * available.
4246 */
4247 if (!mmc->supply.vqmmc) {
4248 ret = mmc_regulator_get_supply(mmc);
4249 if (ret)
4250 return ret;
4251 enable_vqmmc = true;
4252 }
4253
4254 DBG("Version: 0x%08x | Present: 0x%08x\n",
4255 sdhci_readw(host, SDHCI_HOST_VERSION),
4256 sdhci_readl(host, SDHCI_PRESENT_STATE));
4257 DBG("Caps: 0x%08x | Caps_1: 0x%08x\n",
4258 sdhci_readl(host, SDHCI_CAPABILITIES),
4259 sdhci_readl(host, SDHCI_CAPABILITIES_1));
4260
4261 sdhci_read_caps(host);
4262
4263 override_timeout_clk = host->timeout_clk;
4264
4265 if (host->version > SDHCI_SPEC_420) {
4266 pr_err("%s: Unknown controller version (%d). You may experience problems.\n",
4267 mmc_hostname(mmc), host->version);
4268 }
4269
4270 if (host->quirks & SDHCI_QUIRK_FORCE_DMA)
4271 host->flags |= SDHCI_USE_SDMA;
4272 else if (!(host->caps & SDHCI_CAN_DO_SDMA))
4273 DBG("Controller doesn't have SDMA capability\n");
4274 else
4275 host->flags |= SDHCI_USE_SDMA;
4276
4277 if ((host->quirks & SDHCI_QUIRK_BROKEN_DMA) &&
4278 (host->flags & SDHCI_USE_SDMA)) {
4279 DBG("Disabling DMA as it is marked broken\n");
4280 host->flags &= ~SDHCI_USE_SDMA;
4281 }
4282
4283 if ((host->version >= SDHCI_SPEC_200) &&
4284 (host->caps & SDHCI_CAN_DO_ADMA2))
4285 host->flags |= SDHCI_USE_ADMA;
4286
4287 if ((host->quirks & SDHCI_QUIRK_BROKEN_ADMA) &&
4288 (host->flags & SDHCI_USE_ADMA)) {
4289 DBG("Disabling ADMA as it is marked broken\n");
4290 host->flags &= ~SDHCI_USE_ADMA;
4291 }
4292
4293 if (sdhci_can_64bit_dma(host))
4294 host->flags |= SDHCI_USE_64_BIT_DMA;
4295
4296 if (host->use_external_dma) {
4297 ret = sdhci_external_dma_init(host);
4298 if (ret == -EPROBE_DEFER)
4299 goto unreg;
4300 /*
4301 * Fall back to use the DMA/PIO integrated in standard SDHCI
4302 * instead of external DMA devices.
4303 */
4304 else if (ret)
4305 sdhci_switch_external_dma(host, false);
4306 /* Disable internal DMA sources */
4307 else
4308 host->flags &= ~(SDHCI_USE_SDMA | SDHCI_USE_ADMA);
4309 }
4310
4311 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
4312 if (host->ops->set_dma_mask)
4313 ret = host->ops->set_dma_mask(host);
4314 else
4315 ret = sdhci_set_dma_mask(host);
4316
4317 if (!ret && host->ops->enable_dma)
4318 ret = host->ops->enable_dma(host);
4319
4320 if (ret) {
4321 pr_warn("%s: No suitable DMA available - falling back to PIO\n",
4322 mmc_hostname(mmc));
4323 host->flags &= ~(SDHCI_USE_SDMA | SDHCI_USE_ADMA);
4324
4325 ret = 0;
4326 }
4327 }
4328
4329 /* SDMA does not support 64-bit DMA if v4 mode not set */
4330 if ((host->flags & SDHCI_USE_64_BIT_DMA) && !host->v4_mode)
4331 host->flags &= ~SDHCI_USE_SDMA;
4332
4333 if (host->flags & SDHCI_USE_ADMA) {
4334 dma_addr_t dma;
4335 void *buf;
4336
4337 if (!(host->flags & SDHCI_USE_64_BIT_DMA))
4338 host->alloc_desc_sz = SDHCI_ADMA2_32_DESC_SZ;
4339 else if (!host->alloc_desc_sz)
4340 host->alloc_desc_sz = SDHCI_ADMA2_64_DESC_SZ(host);
4341
4342 host->desc_sz = host->alloc_desc_sz;
4343 host->adma_table_sz = host->adma_table_cnt * host->desc_sz;
4344
4345 host->align_buffer_sz = SDHCI_MAX_SEGS * SDHCI_ADMA2_ALIGN;
4346 /*
4347 * Use zalloc to zero the reserved high 32-bits of 128-bit
4348 * descriptors so that they never need to be written.
4349 */
4350 buf = dma_alloc_coherent(mmc_dev(mmc),
4351 host->align_buffer_sz + host->adma_table_sz,
4352 &dma, GFP_KERNEL);
4353 if (!buf) {
4354 pr_warn("%s: Unable to allocate ADMA buffers - falling back to standard DMA\n",
4355 mmc_hostname(mmc));
4356 host->flags &= ~SDHCI_USE_ADMA;
4357 } else if ((dma + host->align_buffer_sz) &
4358 (SDHCI_ADMA2_DESC_ALIGN - 1)) {
4359 pr_warn("%s: unable to allocate aligned ADMA descriptor\n",
4360 mmc_hostname(mmc));
4361 host->flags &= ~SDHCI_USE_ADMA;
4362 dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz +
4363 host->adma_table_sz, buf, dma);
4364 } else {
4365 host->align_buffer = buf;
4366 host->align_addr = dma;
4367
4368 host->adma_table = buf + host->align_buffer_sz;
4369 host->adma_addr = dma + host->align_buffer_sz;
4370 }
4371 }
4372
4373 /*
4374 * If we use DMA, then it's up to the caller to set the DMA
4375 * mask, but PIO does not need the hw shim so we set a new
4376 * mask here in that case.
4377 */
4378 if (!(host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA))) {
4379 host->dma_mask = DMA_BIT_MASK(64);
4380 mmc_dev(mmc)->dma_mask = &host->dma_mask;
4381 }
4382
4383 if (host->version >= SDHCI_SPEC_300)
4384 host->max_clk = FIELD_GET(SDHCI_CLOCK_V3_BASE_MASK, host->caps);
4385 else
4386 host->max_clk = FIELD_GET(SDHCI_CLOCK_BASE_MASK, host->caps);
4387
4388 host->max_clk *= 1000000;
4389 if (host->max_clk == 0 || host->quirks &
4390 SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN) {
4391 if (!host->ops->get_max_clock) {
4392 pr_err("%s: Hardware doesn't specify base clock frequency.\n",
4393 mmc_hostname(mmc));
4394 ret = -ENODEV;
4395 goto undma;
4396 }
4397 host->max_clk = host->ops->get_max_clock(host);
4398 }
4399
4400 /*
4401 * In case of Host Controller v3.00, find out whether clock
4402 * multiplier is supported.
4403 */
4404 host->clk_mul = FIELD_GET(SDHCI_CLOCK_MUL_MASK, host->caps1);
4405
4406 /*
4407 * In case the value in Clock Multiplier is 0, then programmable
4408 * clock mode is not supported, otherwise the actual clock
4409 * multiplier is one more than the value of Clock Multiplier
4410 * in the Capabilities Register.
4411 */
4412 if (host->clk_mul)
4413 host->clk_mul += 1;
4414
4415 /*
4416 * Set host parameters.
4417 */
4418 max_clk = host->max_clk;
4419
4420 if (host->ops->get_min_clock)
4421 mmc->f_min = host->ops->get_min_clock(host);
4422 else if (host->version >= SDHCI_SPEC_300) {
4423 if (host->clk_mul)
4424 max_clk = host->max_clk * host->clk_mul;
4425 /*
4426 * Divided Clock Mode minimum clock rate is always less than
4427 * Programmable Clock Mode minimum clock rate.
4428 */
4429 mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_300;
4430 } else
4431 mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_200;
4432
4433 if (!mmc->f_max || mmc->f_max > max_clk)
4434 mmc->f_max = max_clk;
4435
4436 if (!(host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK)) {
4437 host->timeout_clk = FIELD_GET(SDHCI_TIMEOUT_CLK_MASK, host->caps);
4438
4439 if (host->caps & SDHCI_TIMEOUT_CLK_UNIT)
4440 host->timeout_clk *= 1000;
4441
4442 if (host->timeout_clk == 0) {
4443 if (!host->ops->get_timeout_clock) {
4444 pr_err("%s: Hardware doesn't specify timeout clock frequency.\n",
4445 mmc_hostname(mmc));
4446 ret = -ENODEV;
4447 goto undma;
4448 }
4449
4450 host->timeout_clk =
4451 DIV_ROUND_UP(host->ops->get_timeout_clock(host),
4452 1000);
4453 }
4454
4455 if (override_timeout_clk)
4456 host->timeout_clk = override_timeout_clk;
4457
4458 mmc->max_busy_timeout = host->ops->get_max_timeout_count ?
4459 host->ops->get_max_timeout_count(host) : 1 << 27;
4460 mmc->max_busy_timeout /= host->timeout_clk;
4461 }
4462
4463 if (host->quirks2 & SDHCI_QUIRK2_DISABLE_HW_TIMEOUT &&
4464 !host->ops->get_max_timeout_count)
4465 mmc->max_busy_timeout = 0;
4466
4467 mmc->caps |= MMC_CAP_SDIO_IRQ | MMC_CAP_CMD23;
4468 mmc->caps2 |= MMC_CAP2_SDIO_IRQ_NOTHREAD;
4469
4470 if (host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12)
4471 host->flags |= SDHCI_AUTO_CMD12;
4472
4473 /*
4474 * For v3 mode, Auto-CMD23 stuff only works in ADMA or PIO.
4475 * For v4 mode, SDMA may use Auto-CMD23 as well.
4476 */
4477 if ((host->version >= SDHCI_SPEC_300) &&
4478 ((host->flags & SDHCI_USE_ADMA) ||
4479 !(host->flags & SDHCI_USE_SDMA) || host->v4_mode) &&
4480 !(host->quirks2 & SDHCI_QUIRK2_ACMD23_BROKEN)) {
4481 host->flags |= SDHCI_AUTO_CMD23;
4482 DBG("Auto-CMD23 available\n");
4483 } else {
4484 DBG("Auto-CMD23 unavailable\n");
4485 }
4486
4487 /*
4488 * A controller may support 8-bit width, but the board itself
4489 * might not have the pins brought out. Boards that support
4490 * 8-bit width must set "mmc->caps |= MMC_CAP_8_BIT_DATA;" in
4491 * their platform code before calling sdhci_add_host(), and we
4492 * won't assume 8-bit width for hosts without that CAP.
4493 */
4494 if (!(host->quirks & SDHCI_QUIRK_FORCE_1_BIT_DATA))
4495 mmc->caps |= MMC_CAP_4_BIT_DATA;
4496
4497 if (host->quirks2 & SDHCI_QUIRK2_HOST_NO_CMD23)
4498 mmc->caps &= ~MMC_CAP_CMD23;
4499
4500 if (host->caps & SDHCI_CAN_DO_HISPD)
4501 mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
4502
4503 if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) &&
4504 mmc_card_is_removable(mmc) &&
4505 mmc_gpio_get_cd(mmc) < 0)
4506 mmc->caps |= MMC_CAP_NEEDS_POLL;
4507
4508 if (!IS_ERR(mmc->supply.vqmmc)) {
4509 if (enable_vqmmc) {
4510 ret = regulator_enable(mmc->supply.vqmmc);
4511 host->sdhci_core_to_disable_vqmmc = !ret;
4512 }
4513
4514 /* If vqmmc provides no 1.8V signalling, then there's no UHS */
4515 if (!regulator_is_supported_voltage(mmc->supply.vqmmc, 1700000,
4516 1950000))
4517 host->caps1 &= ~(SDHCI_SUPPORT_SDR104 |
4518 SDHCI_SUPPORT_SDR50 |
4519 SDHCI_SUPPORT_DDR50);
4520
4521 /* In eMMC case vqmmc might be a fixed 1.8V regulator */
4522 if (!regulator_is_supported_voltage(mmc->supply.vqmmc, 2700000,
4523 3600000))
4524 host->flags &= ~SDHCI_SIGNALING_330;
4525
4526 if (ret) {
4527 pr_warn("%s: Failed to enable vqmmc regulator: %d\n",
4528 mmc_hostname(mmc), ret);
4529 mmc->supply.vqmmc = ERR_PTR(-EINVAL);
4530 }
4531
4532 }
4533
4534 if (host->quirks2 & SDHCI_QUIRK2_NO_1_8_V) {
4535 host->caps1 &= ~(SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 |
4536 SDHCI_SUPPORT_DDR50);
4537 /*
4538 * The SDHCI controller in a SoC might support HS200/HS400
4539 * (indicated using mmc-hs200-1_8v/mmc-hs400-1_8v dt property),
4540 * but if the board is modeled such that the IO lines are not
4541 * connected to 1.8v then HS200/HS400 cannot be supported.
4542 * Disable HS200/HS400 if the board does not have 1.8v connected
4543 * to the IO lines. (Applicable for other modes in 1.8v)
4544 */
4545 mmc->caps2 &= ~(MMC_CAP2_HSX00_1_8V | MMC_CAP2_HS400_ES);
4546 mmc->caps &= ~(MMC_CAP_1_8V_DDR | MMC_CAP_UHS);
4547 }
4548
4549 /* Any UHS-I mode in caps implies SDR12 and SDR25 support. */
4550 if (host->caps1 & (SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 |
4551 SDHCI_SUPPORT_DDR50))
4552 mmc->caps |= MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25;
4553
4554 /* SDR104 supports also implies SDR50 support */
4555 if (host->caps1 & SDHCI_SUPPORT_SDR104) {
4556 mmc->caps |= MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_SDR50;
4557 /* SD3.0: SDR104 is supported so (for eMMC) the caps2
4558 * field can be promoted to support HS200.
4559 */
4560 if (!(host->quirks2 & SDHCI_QUIRK2_BROKEN_HS200))
4561 mmc->caps2 |= MMC_CAP2_HS200;
4562 } else if (host->caps1 & SDHCI_SUPPORT_SDR50) {
4563 mmc->caps |= MMC_CAP_UHS_SDR50;
4564 }
4565
4566 if (host->quirks2 & SDHCI_QUIRK2_CAPS_BIT63_FOR_HS400 &&
4567 (host->caps1 & SDHCI_SUPPORT_HS400))
4568 mmc->caps2 |= MMC_CAP2_HS400;
4569
4570 if ((mmc->caps2 & MMC_CAP2_HSX00_1_2V) &&
4571 (IS_ERR(mmc->supply.vqmmc) ||
4572 !regulator_is_supported_voltage(mmc->supply.vqmmc, 1100000,
4573 1300000)))
4574 mmc->caps2 &= ~MMC_CAP2_HSX00_1_2V;
4575
4576 if ((host->caps1 & SDHCI_SUPPORT_DDR50) &&
4577 !(host->quirks2 & SDHCI_QUIRK2_BROKEN_DDR50))
4578 mmc->caps |= MMC_CAP_UHS_DDR50;
4579
4580 /* Does the host need tuning for SDR50? */
4581 if (host->caps1 & SDHCI_USE_SDR50_TUNING)
4582 host->flags |= SDHCI_SDR50_NEEDS_TUNING;
4583
4584 /* Driver Type(s) (A, C, D) supported by the host */
4585 if (host->caps1 & SDHCI_DRIVER_TYPE_A)
4586 mmc->caps |= MMC_CAP_DRIVER_TYPE_A;
4587 if (host->caps1 & SDHCI_DRIVER_TYPE_C)
4588 mmc->caps |= MMC_CAP_DRIVER_TYPE_C;
4589 if (host->caps1 & SDHCI_DRIVER_TYPE_D)
4590 mmc->caps |= MMC_CAP_DRIVER_TYPE_D;
4591
4592 /* Initial value for re-tuning timer count */
4593 host->tuning_count = FIELD_GET(SDHCI_RETUNING_TIMER_COUNT_MASK,
4594 host->caps1);
4595
4596 /*
4597 * In case Re-tuning Timer is not disabled, the actual value of
4598 * re-tuning timer will be 2 ^ (n - 1).
4599 */
4600 if (host->tuning_count)
4601 host->tuning_count = 1 << (host->tuning_count - 1);
4602
4603 /* Re-tuning mode supported by the Host Controller */
4604 host->tuning_mode = FIELD_GET(SDHCI_RETUNING_MODE_MASK, host->caps1);
4605
4606 ocr_avail = 0;
4607
4608 /*
4609 * According to SD Host Controller spec v3.00, if the Host System
4610 * can afford more than 150mA, Host Driver should set XPC to 1. Also
4611 * the value is meaningful only if Voltage Support in the Capabilities
4612 * register is set. The actual current value is 4 times the register
4613 * value.
4614 */
4615 max_current_caps = sdhci_readl(host, SDHCI_MAX_CURRENT);
4616 if (!max_current_caps && !IS_ERR(mmc->supply.vmmc)) {
4617 int curr = regulator_get_current_limit(mmc->supply.vmmc);
4618 if (curr > 0) {
4619
4620 /* convert to SDHCI_MAX_CURRENT format */
4621 curr = curr/1000; /* convert to mA */
4622 curr = curr/SDHCI_MAX_CURRENT_MULTIPLIER;
4623
4624 curr = min_t(u32, curr, SDHCI_MAX_CURRENT_LIMIT);
4625 max_current_caps =
4626 FIELD_PREP(SDHCI_MAX_CURRENT_330_MASK, curr) |
4627 FIELD_PREP(SDHCI_MAX_CURRENT_300_MASK, curr) |
4628 FIELD_PREP(SDHCI_MAX_CURRENT_180_MASK, curr);
4629 }
4630 }
4631
4632 if (host->caps & SDHCI_CAN_VDD_330) {
4633 ocr_avail |= MMC_VDD_32_33 | MMC_VDD_33_34;
4634
4635 mmc->max_current_330 = FIELD_GET(SDHCI_MAX_CURRENT_330_MASK,
4636 max_current_caps) *
4637 SDHCI_MAX_CURRENT_MULTIPLIER;
4638 }
4639 if (host->caps & SDHCI_CAN_VDD_300) {
4640 ocr_avail |= MMC_VDD_29_30 | MMC_VDD_30_31;
4641
4642 mmc->max_current_300 = FIELD_GET(SDHCI_MAX_CURRENT_300_MASK,
4643 max_current_caps) *
4644 SDHCI_MAX_CURRENT_MULTIPLIER;
4645 }
4646 if (host->caps & SDHCI_CAN_VDD_180) {
4647 ocr_avail |= MMC_VDD_165_195;
4648
4649 mmc->max_current_180 = FIELD_GET(SDHCI_MAX_CURRENT_180_MASK,
4650 max_current_caps) *
4651 SDHCI_MAX_CURRENT_MULTIPLIER;
4652 }
4653
4654 /* If OCR set by host, use it instead. */
4655 if (host->ocr_mask)
4656 ocr_avail = host->ocr_mask;
4657
4658 /* If OCR set by external regulators, give it highest prio. */
4659 if (mmc->ocr_avail)
4660 ocr_avail = mmc->ocr_avail;
4661
4662 mmc->ocr_avail = ocr_avail;
4663 mmc->ocr_avail_sdio = ocr_avail;
4664 if (host->ocr_avail_sdio)
4665 mmc->ocr_avail_sdio &= host->ocr_avail_sdio;
4666 mmc->ocr_avail_sd = ocr_avail;
4667 if (host->ocr_avail_sd)
4668 mmc->ocr_avail_sd &= host->ocr_avail_sd;
4669 else /* normal SD controllers don't support 1.8V */
4670 mmc->ocr_avail_sd &= ~MMC_VDD_165_195;
4671 mmc->ocr_avail_mmc = ocr_avail;
4672 if (host->ocr_avail_mmc)
4673 mmc->ocr_avail_mmc &= host->ocr_avail_mmc;
4674
4675 if (mmc->ocr_avail == 0) {
4676 pr_err("%s: Hardware doesn't report any support voltages.\n",
4677 mmc_hostname(mmc));
4678 ret = -ENODEV;
4679 goto unreg;
4680 }
4681
4682 if ((mmc->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
4683 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 |
4684 MMC_CAP_UHS_DDR50 | MMC_CAP_1_8V_DDR)) ||
4685 (mmc->caps2 & (MMC_CAP2_HS200_1_8V_SDR | MMC_CAP2_HS400_1_8V)))
4686 host->flags |= SDHCI_SIGNALING_180;
4687
4688 if (mmc->caps2 & MMC_CAP2_HSX00_1_2V)
4689 host->flags |= SDHCI_SIGNALING_120;
4690
4691 spin_lock_init(&host->lock);
4692
4693 /*
4694 * Maximum number of sectors in one transfer. Limited by SDMA boundary
4695 * size (512KiB). Note some tuning modes impose a 4MiB limit, but this
4696 * is less anyway.
4697 */
4698 mmc->max_req_size = 524288;
4699
4700 /*
4701 * Maximum number of segments. Depends on if the hardware
4702 * can do scatter/gather or not.
4703 */
4704 if (host->flags & SDHCI_USE_ADMA) {
4705 mmc->max_segs = SDHCI_MAX_SEGS;
4706 } else if (host->flags & SDHCI_USE_SDMA) {
4707 mmc->max_segs = 1;
4708 mmc->max_req_size = min_t(size_t, mmc->max_req_size,
4709 dma_max_mapping_size(mmc_dev(mmc)));
4710 } else { /* PIO */
4711 mmc->max_segs = SDHCI_MAX_SEGS;
4712 }
4713
4714 /*
4715 * Maximum segment size. Could be one segment with the maximum number
4716 * of bytes. When doing hardware scatter/gather, each entry cannot
4717 * be larger than 64 KiB though.
4718 */
4719 if (host->flags & SDHCI_USE_ADMA) {
4720 if (host->quirks & SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC) {
4721 host->max_adma = 65532; /* 32-bit alignment */
4722 mmc->max_seg_size = 65535;
4723 } else {
4724 mmc->max_seg_size = 65536;
4725 }
4726 } else {
4727 mmc->max_seg_size = mmc->max_req_size;
4728 }
4729
4730 /*
4731 * Maximum block size. This varies from controller to controller and
4732 * is specified in the capabilities register.
4733 */
4734 if (host->quirks & SDHCI_QUIRK_FORCE_BLK_SZ_2048) {
4735 mmc->max_blk_size = 2;
4736 } else {
4737 mmc->max_blk_size = (host->caps & SDHCI_MAX_BLOCK_MASK) >>
4738 SDHCI_MAX_BLOCK_SHIFT;
4739 if (mmc->max_blk_size >= 3) {
4740 pr_warn("%s: Invalid maximum block size, assuming 512 bytes\n",
4741 mmc_hostname(mmc));
4742 mmc->max_blk_size = 0;
4743 }
4744 }
4745
4746 mmc->max_blk_size = 512 << mmc->max_blk_size;
4747
4748 /*
4749 * Maximum block count.
4750 */
4751 mmc->max_blk_count = (host->quirks & SDHCI_QUIRK_NO_MULTIBLOCK) ? 1 : 65535;
4752
4753 if (mmc->max_segs == 1)
4754 /* This may alter mmc->*_blk_* parameters */
4755 sdhci_allocate_bounce_buffer(host);
4756
4757 return 0;
4758
4759unreg:
4760 if (host->sdhci_core_to_disable_vqmmc)
4761 regulator_disable(mmc->supply.vqmmc);
4762undma:
4763 if (host->align_buffer)
4764 dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz +
4765 host->adma_table_sz, host->align_buffer,
4766 host->align_addr);
4767 host->adma_table = NULL;
4768 host->align_buffer = NULL;
4769
4770 return ret;
4771}
4772EXPORT_SYMBOL_GPL(sdhci_setup_host);
4773
4774void sdhci_cleanup_host(struct sdhci_host *host)
4775{
4776 struct mmc_host *mmc = host->mmc;
4777
4778 if (host->sdhci_core_to_disable_vqmmc)
4779 regulator_disable(mmc->supply.vqmmc);
4780
4781 if (host->align_buffer)
4782 dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz +
4783 host->adma_table_sz, host->align_buffer,
4784 host->align_addr);
4785
4786 if (host->use_external_dma)
4787 sdhci_external_dma_release(host);
4788
4789 host->adma_table = NULL;
4790 host->align_buffer = NULL;
4791}
4792EXPORT_SYMBOL_GPL(sdhci_cleanup_host);
4793
4794int __sdhci_add_host(struct sdhci_host *host)
4795{
4796 unsigned int flags = WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_HIGHPRI;
4797 struct mmc_host *mmc = host->mmc;
4798 int ret;
4799
4800 if ((mmc->caps2 & MMC_CAP2_CQE) &&
4801 (host->quirks & SDHCI_QUIRK_BROKEN_CQE)) {
4802 mmc->caps2 &= ~MMC_CAP2_CQE;
4803 mmc->cqe_ops = NULL;
4804 }
4805
4806 host->complete_wq = alloc_workqueue("sdhci", flags, 0);
4807 if (!host->complete_wq)
4808 return -ENOMEM;
4809
4810 INIT_WORK(&host->complete_work, sdhci_complete_work);
4811
4812 timer_setup(&host->timer, sdhci_timeout_timer, 0);
4813 timer_setup(&host->data_timer, sdhci_timeout_data_timer, 0);
4814
4815 init_waitqueue_head(&host->buf_ready_int);
4816
4817 sdhci_init(host, 0);
4818
4819 ret = request_threaded_irq(host->irq, sdhci_irq, sdhci_thread_irq,
4820 IRQF_SHARED, mmc_hostname(mmc), host);
4821 if (ret) {
4822 pr_err("%s: Failed to request IRQ %d: %d\n",
4823 mmc_hostname(mmc), host->irq, ret);
4824 goto unwq;
4825 }
4826
4827 ret = sdhci_led_register(host);
4828 if (ret) {
4829 pr_err("%s: Failed to register LED device: %d\n",
4830 mmc_hostname(mmc), ret);
4831 goto unirq;
4832 }
4833
4834 ret = mmc_add_host(mmc);
4835 if (ret)
4836 goto unled;
4837
4838 pr_info("%s: SDHCI controller on %s [%s] using %s\n",
4839 mmc_hostname(mmc), host->hw_name, dev_name(mmc_dev(mmc)),
4840 host->use_external_dma ? "External DMA" :
4841 (host->flags & SDHCI_USE_ADMA) ?
4842 (host->flags & SDHCI_USE_64_BIT_DMA) ? "ADMA 64-bit" : "ADMA" :
4843 (host->flags & SDHCI_USE_SDMA) ? "DMA" : "PIO");
4844
4845 sdhci_enable_card_detection(host);
4846
4847 return 0;
4848
4849unled:
4850 sdhci_led_unregister(host);
4851unirq:
4852 sdhci_reset_for_all(host);
4853 sdhci_writel(host, 0, SDHCI_INT_ENABLE);
4854 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
4855 free_irq(host->irq, host);
4856unwq:
4857 destroy_workqueue(host->complete_wq);
4858
4859 return ret;
4860}
4861EXPORT_SYMBOL_GPL(__sdhci_add_host);
4862
4863int sdhci_add_host(struct sdhci_host *host)
4864{
4865 int ret;
4866
4867 ret = sdhci_setup_host(host);
4868 if (ret)
4869 return ret;
4870
4871 ret = __sdhci_add_host(host);
4872 if (ret)
4873 goto cleanup;
4874
4875 return 0;
4876
4877cleanup:
4878 sdhci_cleanup_host(host);
4879
4880 return ret;
4881}
4882EXPORT_SYMBOL_GPL(sdhci_add_host);
4883
4884void sdhci_remove_host(struct sdhci_host *host, int dead)
4885{
4886 struct mmc_host *mmc = host->mmc;
4887 unsigned long flags;
4888
4889 if (dead) {
4890 spin_lock_irqsave(&host->lock, flags);
4891
4892 host->flags |= SDHCI_DEVICE_DEAD;
4893
4894 if (sdhci_has_requests(host)) {
4895 pr_err("%s: Controller removed during "
4896 " transfer!\n", mmc_hostname(mmc));
4897 sdhci_error_out_mrqs(host, -ENOMEDIUM);
4898 }
4899
4900 spin_unlock_irqrestore(&host->lock, flags);
4901 }
4902
4903 sdhci_disable_card_detection(host);
4904
4905 mmc_remove_host(mmc);
4906
4907 sdhci_led_unregister(host);
4908
4909 if (!dead)
4910 sdhci_reset_for_all(host);
4911
4912 sdhci_writel(host, 0, SDHCI_INT_ENABLE);
4913 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
4914 free_irq(host->irq, host);
4915
4916 del_timer_sync(&host->timer);
4917 del_timer_sync(&host->data_timer);
4918
4919 destroy_workqueue(host->complete_wq);
4920
4921 if (host->sdhci_core_to_disable_vqmmc)
4922 regulator_disable(mmc->supply.vqmmc);
4923
4924 if (host->align_buffer)
4925 dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz +
4926 host->adma_table_sz, host->align_buffer,
4927 host->align_addr);
4928
4929 if (host->use_external_dma)
4930 sdhci_external_dma_release(host);
4931
4932 host->adma_table = NULL;
4933 host->align_buffer = NULL;
4934}
4935
4936EXPORT_SYMBOL_GPL(sdhci_remove_host);
4937
4938void sdhci_free_host(struct sdhci_host *host)
4939{
4940 mmc_free_host(host->mmc);
4941}
4942
4943EXPORT_SYMBOL_GPL(sdhci_free_host);
4944
4945/*****************************************************************************\
4946 * *
4947 * Driver init/exit *
4948 * *
4949\*****************************************************************************/
4950
4951static int __init sdhci_drv_init(void)
4952{
4953 pr_info(DRIVER_NAME
4954 ": Secure Digital Host Controller Interface driver\n");
4955 pr_info(DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
4956
4957 return 0;
4958}
4959
4960static void __exit sdhci_drv_exit(void)
4961{
4962}
4963
4964module_init(sdhci_drv_init);
4965module_exit(sdhci_drv_exit);
4966
4967module_param(debug_quirks, uint, 0444);
4968module_param(debug_quirks2, uint, 0444);
4969
4970MODULE_AUTHOR("Pierre Ossman <pierre@ossman.eu>");
4971MODULE_DESCRIPTION("Secure Digital Host Controller Interface core driver");
4972MODULE_LICENSE("GPL");
4973
4974MODULE_PARM_DESC(debug_quirks, "Force certain quirks.");
4975MODULE_PARM_DESC(debug_quirks2, "Force certain other quirks.");
1/*
2 * linux/drivers/mmc/host/sdhci.c - Secure Digital Host Controller Interface driver
3 *
4 * Copyright (C) 2005-2008 Pierre Ossman, All Rights Reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or (at
9 * your option) any later version.
10 *
11 * Thanks to the following companies for their support:
12 *
13 * - JMicron (hardware and technical support)
14 */
15
16#include <linux/delay.h>
17#include <linux/ktime.h>
18#include <linux/highmem.h>
19#include <linux/io.h>
20#include <linux/module.h>
21#include <linux/dma-mapping.h>
22#include <linux/slab.h>
23#include <linux/scatterlist.h>
24#include <linux/sizes.h>
25#include <linux/swiotlb.h>
26#include <linux/regulator/consumer.h>
27#include <linux/pm_runtime.h>
28#include <linux/of.h>
29
30#include <linux/leds.h>
31
32#include <linux/mmc/mmc.h>
33#include <linux/mmc/host.h>
34#include <linux/mmc/card.h>
35#include <linux/mmc/sdio.h>
36#include <linux/mmc/slot-gpio.h>
37
38#include "sdhci.h"
39
40#define DRIVER_NAME "sdhci"
41
42#define DBG(f, x...) \
43 pr_debug("%s: " DRIVER_NAME ": " f, mmc_hostname(host->mmc), ## x)
44
45#define SDHCI_DUMP(f, x...) \
46 pr_err("%s: " DRIVER_NAME ": " f, mmc_hostname(host->mmc), ## x)
47
48#define MAX_TUNING_LOOP 40
49
50static unsigned int debug_quirks = 0;
51static unsigned int debug_quirks2;
52
53static void sdhci_finish_data(struct sdhci_host *);
54
55static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable);
56
57void sdhci_dumpregs(struct sdhci_host *host)
58{
59 SDHCI_DUMP("============ SDHCI REGISTER DUMP ===========\n");
60
61 SDHCI_DUMP("Sys addr: 0x%08x | Version: 0x%08x\n",
62 sdhci_readl(host, SDHCI_DMA_ADDRESS),
63 sdhci_readw(host, SDHCI_HOST_VERSION));
64 SDHCI_DUMP("Blk size: 0x%08x | Blk cnt: 0x%08x\n",
65 sdhci_readw(host, SDHCI_BLOCK_SIZE),
66 sdhci_readw(host, SDHCI_BLOCK_COUNT));
67 SDHCI_DUMP("Argument: 0x%08x | Trn mode: 0x%08x\n",
68 sdhci_readl(host, SDHCI_ARGUMENT),
69 sdhci_readw(host, SDHCI_TRANSFER_MODE));
70 SDHCI_DUMP("Present: 0x%08x | Host ctl: 0x%08x\n",
71 sdhci_readl(host, SDHCI_PRESENT_STATE),
72 sdhci_readb(host, SDHCI_HOST_CONTROL));
73 SDHCI_DUMP("Power: 0x%08x | Blk gap: 0x%08x\n",
74 sdhci_readb(host, SDHCI_POWER_CONTROL),
75 sdhci_readb(host, SDHCI_BLOCK_GAP_CONTROL));
76 SDHCI_DUMP("Wake-up: 0x%08x | Clock: 0x%08x\n",
77 sdhci_readb(host, SDHCI_WAKE_UP_CONTROL),
78 sdhci_readw(host, SDHCI_CLOCK_CONTROL));
79 SDHCI_DUMP("Timeout: 0x%08x | Int stat: 0x%08x\n",
80 sdhci_readb(host, SDHCI_TIMEOUT_CONTROL),
81 sdhci_readl(host, SDHCI_INT_STATUS));
82 SDHCI_DUMP("Int enab: 0x%08x | Sig enab: 0x%08x\n",
83 sdhci_readl(host, SDHCI_INT_ENABLE),
84 sdhci_readl(host, SDHCI_SIGNAL_ENABLE));
85 SDHCI_DUMP("AC12 err: 0x%08x | Slot int: 0x%08x\n",
86 sdhci_readw(host, SDHCI_ACMD12_ERR),
87 sdhci_readw(host, SDHCI_SLOT_INT_STATUS));
88 SDHCI_DUMP("Caps: 0x%08x | Caps_1: 0x%08x\n",
89 sdhci_readl(host, SDHCI_CAPABILITIES),
90 sdhci_readl(host, SDHCI_CAPABILITIES_1));
91 SDHCI_DUMP("Cmd: 0x%08x | Max curr: 0x%08x\n",
92 sdhci_readw(host, SDHCI_COMMAND),
93 sdhci_readl(host, SDHCI_MAX_CURRENT));
94 SDHCI_DUMP("Resp[0]: 0x%08x | Resp[1]: 0x%08x\n",
95 sdhci_readl(host, SDHCI_RESPONSE),
96 sdhci_readl(host, SDHCI_RESPONSE + 4));
97 SDHCI_DUMP("Resp[2]: 0x%08x | Resp[3]: 0x%08x\n",
98 sdhci_readl(host, SDHCI_RESPONSE + 8),
99 sdhci_readl(host, SDHCI_RESPONSE + 12));
100 SDHCI_DUMP("Host ctl2: 0x%08x\n",
101 sdhci_readw(host, SDHCI_HOST_CONTROL2));
102
103 if (host->flags & SDHCI_USE_ADMA) {
104 if (host->flags & SDHCI_USE_64_BIT_DMA) {
105 SDHCI_DUMP("ADMA Err: 0x%08x | ADMA Ptr: 0x%08x%08x\n",
106 sdhci_readl(host, SDHCI_ADMA_ERROR),
107 sdhci_readl(host, SDHCI_ADMA_ADDRESS_HI),
108 sdhci_readl(host, SDHCI_ADMA_ADDRESS));
109 } else {
110 SDHCI_DUMP("ADMA Err: 0x%08x | ADMA Ptr: 0x%08x\n",
111 sdhci_readl(host, SDHCI_ADMA_ERROR),
112 sdhci_readl(host, SDHCI_ADMA_ADDRESS));
113 }
114 }
115
116 SDHCI_DUMP("============================================\n");
117}
118EXPORT_SYMBOL_GPL(sdhci_dumpregs);
119
120/*****************************************************************************\
121 * *
122 * Low level functions *
123 * *
124\*****************************************************************************/
125
126static inline bool sdhci_data_line_cmd(struct mmc_command *cmd)
127{
128 return cmd->data || cmd->flags & MMC_RSP_BUSY;
129}
130
131static void sdhci_set_card_detection(struct sdhci_host *host, bool enable)
132{
133 u32 present;
134
135 if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) ||
136 !mmc_card_is_removable(host->mmc))
137 return;
138
139 if (enable) {
140 present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
141 SDHCI_CARD_PRESENT;
142
143 host->ier |= present ? SDHCI_INT_CARD_REMOVE :
144 SDHCI_INT_CARD_INSERT;
145 } else {
146 host->ier &= ~(SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT);
147 }
148
149 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
150 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
151}
152
153static void sdhci_enable_card_detection(struct sdhci_host *host)
154{
155 sdhci_set_card_detection(host, true);
156}
157
158static void sdhci_disable_card_detection(struct sdhci_host *host)
159{
160 sdhci_set_card_detection(host, false);
161}
162
163static void sdhci_runtime_pm_bus_on(struct sdhci_host *host)
164{
165 if (host->bus_on)
166 return;
167 host->bus_on = true;
168 pm_runtime_get_noresume(host->mmc->parent);
169}
170
171static void sdhci_runtime_pm_bus_off(struct sdhci_host *host)
172{
173 if (!host->bus_on)
174 return;
175 host->bus_on = false;
176 pm_runtime_put_noidle(host->mmc->parent);
177}
178
179void sdhci_reset(struct sdhci_host *host, u8 mask)
180{
181 ktime_t timeout;
182
183 sdhci_writeb(host, mask, SDHCI_SOFTWARE_RESET);
184
185 if (mask & SDHCI_RESET_ALL) {
186 host->clock = 0;
187 /* Reset-all turns off SD Bus Power */
188 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
189 sdhci_runtime_pm_bus_off(host);
190 }
191
192 /* Wait max 100 ms */
193 timeout = ktime_add_ms(ktime_get(), 100);
194
195 /* hw clears the bit when it's done */
196 while (sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask) {
197 if (ktime_after(ktime_get(), timeout)) {
198 pr_err("%s: Reset 0x%x never completed.\n",
199 mmc_hostname(host->mmc), (int)mask);
200 sdhci_dumpregs(host);
201 return;
202 }
203 udelay(10);
204 }
205}
206EXPORT_SYMBOL_GPL(sdhci_reset);
207
208static void sdhci_do_reset(struct sdhci_host *host, u8 mask)
209{
210 if (host->quirks & SDHCI_QUIRK_NO_CARD_NO_RESET) {
211 struct mmc_host *mmc = host->mmc;
212
213 if (!mmc->ops->get_cd(mmc))
214 return;
215 }
216
217 host->ops->reset(host, mask);
218
219 if (mask & SDHCI_RESET_ALL) {
220 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
221 if (host->ops->enable_dma)
222 host->ops->enable_dma(host);
223 }
224
225 /* Resetting the controller clears many */
226 host->preset_enabled = false;
227 }
228}
229
230static void sdhci_set_default_irqs(struct sdhci_host *host)
231{
232 host->ier = SDHCI_INT_BUS_POWER | SDHCI_INT_DATA_END_BIT |
233 SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_TIMEOUT |
234 SDHCI_INT_INDEX | SDHCI_INT_END_BIT | SDHCI_INT_CRC |
235 SDHCI_INT_TIMEOUT | SDHCI_INT_DATA_END |
236 SDHCI_INT_RESPONSE;
237
238 if (host->tuning_mode == SDHCI_TUNING_MODE_2 ||
239 host->tuning_mode == SDHCI_TUNING_MODE_3)
240 host->ier |= SDHCI_INT_RETUNE;
241
242 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
243 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
244}
245
246static void sdhci_init(struct sdhci_host *host, int soft)
247{
248 struct mmc_host *mmc = host->mmc;
249
250 if (soft)
251 sdhci_do_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
252 else
253 sdhci_do_reset(host, SDHCI_RESET_ALL);
254
255 sdhci_set_default_irqs(host);
256
257 host->cqe_on = false;
258
259 if (soft) {
260 /* force clock reconfiguration */
261 host->clock = 0;
262 mmc->ops->set_ios(mmc, &mmc->ios);
263 }
264}
265
266static void sdhci_reinit(struct sdhci_host *host)
267{
268 sdhci_init(host, 0);
269 sdhci_enable_card_detection(host);
270}
271
272static void __sdhci_led_activate(struct sdhci_host *host)
273{
274 u8 ctrl;
275
276 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
277 ctrl |= SDHCI_CTRL_LED;
278 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
279}
280
281static void __sdhci_led_deactivate(struct sdhci_host *host)
282{
283 u8 ctrl;
284
285 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
286 ctrl &= ~SDHCI_CTRL_LED;
287 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
288}
289
290#if IS_REACHABLE(CONFIG_LEDS_CLASS)
291static void sdhci_led_control(struct led_classdev *led,
292 enum led_brightness brightness)
293{
294 struct sdhci_host *host = container_of(led, struct sdhci_host, led);
295 unsigned long flags;
296
297 spin_lock_irqsave(&host->lock, flags);
298
299 if (host->runtime_suspended)
300 goto out;
301
302 if (brightness == LED_OFF)
303 __sdhci_led_deactivate(host);
304 else
305 __sdhci_led_activate(host);
306out:
307 spin_unlock_irqrestore(&host->lock, flags);
308}
309
310static int sdhci_led_register(struct sdhci_host *host)
311{
312 struct mmc_host *mmc = host->mmc;
313
314 snprintf(host->led_name, sizeof(host->led_name),
315 "%s::", mmc_hostname(mmc));
316
317 host->led.name = host->led_name;
318 host->led.brightness = LED_OFF;
319 host->led.default_trigger = mmc_hostname(mmc);
320 host->led.brightness_set = sdhci_led_control;
321
322 return led_classdev_register(mmc_dev(mmc), &host->led);
323}
324
325static void sdhci_led_unregister(struct sdhci_host *host)
326{
327 led_classdev_unregister(&host->led);
328}
329
330static inline void sdhci_led_activate(struct sdhci_host *host)
331{
332}
333
334static inline void sdhci_led_deactivate(struct sdhci_host *host)
335{
336}
337
338#else
339
340static inline int sdhci_led_register(struct sdhci_host *host)
341{
342 return 0;
343}
344
345static inline void sdhci_led_unregister(struct sdhci_host *host)
346{
347}
348
349static inline void sdhci_led_activate(struct sdhci_host *host)
350{
351 __sdhci_led_activate(host);
352}
353
354static inline void sdhci_led_deactivate(struct sdhci_host *host)
355{
356 __sdhci_led_deactivate(host);
357}
358
359#endif
360
361/*****************************************************************************\
362 * *
363 * Core functions *
364 * *
365\*****************************************************************************/
366
367static void sdhci_read_block_pio(struct sdhci_host *host)
368{
369 unsigned long flags;
370 size_t blksize, len, chunk;
371 u32 uninitialized_var(scratch);
372 u8 *buf;
373
374 DBG("PIO reading\n");
375
376 blksize = host->data->blksz;
377 chunk = 0;
378
379 local_irq_save(flags);
380
381 while (blksize) {
382 BUG_ON(!sg_miter_next(&host->sg_miter));
383
384 len = min(host->sg_miter.length, blksize);
385
386 blksize -= len;
387 host->sg_miter.consumed = len;
388
389 buf = host->sg_miter.addr;
390
391 while (len) {
392 if (chunk == 0) {
393 scratch = sdhci_readl(host, SDHCI_BUFFER);
394 chunk = 4;
395 }
396
397 *buf = scratch & 0xFF;
398
399 buf++;
400 scratch >>= 8;
401 chunk--;
402 len--;
403 }
404 }
405
406 sg_miter_stop(&host->sg_miter);
407
408 local_irq_restore(flags);
409}
410
411static void sdhci_write_block_pio(struct sdhci_host *host)
412{
413 unsigned long flags;
414 size_t blksize, len, chunk;
415 u32 scratch;
416 u8 *buf;
417
418 DBG("PIO writing\n");
419
420 blksize = host->data->blksz;
421 chunk = 0;
422 scratch = 0;
423
424 local_irq_save(flags);
425
426 while (blksize) {
427 BUG_ON(!sg_miter_next(&host->sg_miter));
428
429 len = min(host->sg_miter.length, blksize);
430
431 blksize -= len;
432 host->sg_miter.consumed = len;
433
434 buf = host->sg_miter.addr;
435
436 while (len) {
437 scratch |= (u32)*buf << (chunk * 8);
438
439 buf++;
440 chunk++;
441 len--;
442
443 if ((chunk == 4) || ((len == 0) && (blksize == 0))) {
444 sdhci_writel(host, scratch, SDHCI_BUFFER);
445 chunk = 0;
446 scratch = 0;
447 }
448 }
449 }
450
451 sg_miter_stop(&host->sg_miter);
452
453 local_irq_restore(flags);
454}
455
456static void sdhci_transfer_pio(struct sdhci_host *host)
457{
458 u32 mask;
459
460 if (host->blocks == 0)
461 return;
462
463 if (host->data->flags & MMC_DATA_READ)
464 mask = SDHCI_DATA_AVAILABLE;
465 else
466 mask = SDHCI_SPACE_AVAILABLE;
467
468 /*
469 * Some controllers (JMicron JMB38x) mess up the buffer bits
470 * for transfers < 4 bytes. As long as it is just one block,
471 * we can ignore the bits.
472 */
473 if ((host->quirks & SDHCI_QUIRK_BROKEN_SMALL_PIO) &&
474 (host->data->blocks == 1))
475 mask = ~0;
476
477 while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) {
478 if (host->quirks & SDHCI_QUIRK_PIO_NEEDS_DELAY)
479 udelay(100);
480
481 if (host->data->flags & MMC_DATA_READ)
482 sdhci_read_block_pio(host);
483 else
484 sdhci_write_block_pio(host);
485
486 host->blocks--;
487 if (host->blocks == 0)
488 break;
489 }
490
491 DBG("PIO transfer complete.\n");
492}
493
494static int sdhci_pre_dma_transfer(struct sdhci_host *host,
495 struct mmc_data *data, int cookie)
496{
497 int sg_count;
498
499 /*
500 * If the data buffers are already mapped, return the previous
501 * dma_map_sg() result.
502 */
503 if (data->host_cookie == COOKIE_PRE_MAPPED)
504 return data->sg_count;
505
506 /* Bounce write requests to the bounce buffer */
507 if (host->bounce_buffer) {
508 unsigned int length = data->blksz * data->blocks;
509
510 if (length > host->bounce_buffer_size) {
511 pr_err("%s: asked for transfer of %u bytes exceeds bounce buffer %u bytes\n",
512 mmc_hostname(host->mmc), length,
513 host->bounce_buffer_size);
514 return -EIO;
515 }
516 if (mmc_get_dma_dir(data) == DMA_TO_DEVICE) {
517 /* Copy the data to the bounce buffer */
518 sg_copy_to_buffer(data->sg, data->sg_len,
519 host->bounce_buffer,
520 length);
521 }
522 /* Switch ownership to the DMA */
523 dma_sync_single_for_device(host->mmc->parent,
524 host->bounce_addr,
525 host->bounce_buffer_size,
526 mmc_get_dma_dir(data));
527 /* Just a dummy value */
528 sg_count = 1;
529 } else {
530 /* Just access the data directly from memory */
531 sg_count = dma_map_sg(mmc_dev(host->mmc),
532 data->sg, data->sg_len,
533 mmc_get_dma_dir(data));
534 }
535
536 if (sg_count == 0)
537 return -ENOSPC;
538
539 data->sg_count = sg_count;
540 data->host_cookie = cookie;
541
542 return sg_count;
543}
544
545static char *sdhci_kmap_atomic(struct scatterlist *sg, unsigned long *flags)
546{
547 local_irq_save(*flags);
548 return kmap_atomic(sg_page(sg)) + sg->offset;
549}
550
551static void sdhci_kunmap_atomic(void *buffer, unsigned long *flags)
552{
553 kunmap_atomic(buffer);
554 local_irq_restore(*flags);
555}
556
557static void sdhci_adma_write_desc(struct sdhci_host *host, void *desc,
558 dma_addr_t addr, int len, unsigned cmd)
559{
560 struct sdhci_adma2_64_desc *dma_desc = desc;
561
562 /* 32-bit and 64-bit descriptors have these members in same position */
563 dma_desc->cmd = cpu_to_le16(cmd);
564 dma_desc->len = cpu_to_le16(len);
565 dma_desc->addr_lo = cpu_to_le32((u32)addr);
566
567 if (host->flags & SDHCI_USE_64_BIT_DMA)
568 dma_desc->addr_hi = cpu_to_le32((u64)addr >> 32);
569}
570
571static void sdhci_adma_mark_end(void *desc)
572{
573 struct sdhci_adma2_64_desc *dma_desc = desc;
574
575 /* 32-bit and 64-bit descriptors have 'cmd' in same position */
576 dma_desc->cmd |= cpu_to_le16(ADMA2_END);
577}
578
579static void sdhci_adma_table_pre(struct sdhci_host *host,
580 struct mmc_data *data, int sg_count)
581{
582 struct scatterlist *sg;
583 unsigned long flags;
584 dma_addr_t addr, align_addr;
585 void *desc, *align;
586 char *buffer;
587 int len, offset, i;
588
589 /*
590 * The spec does not specify endianness of descriptor table.
591 * We currently guess that it is LE.
592 */
593
594 host->sg_count = sg_count;
595
596 desc = host->adma_table;
597 align = host->align_buffer;
598
599 align_addr = host->align_addr;
600
601 for_each_sg(data->sg, sg, host->sg_count, i) {
602 addr = sg_dma_address(sg);
603 len = sg_dma_len(sg);
604
605 /*
606 * The SDHCI specification states that ADMA addresses must
607 * be 32-bit aligned. If they aren't, then we use a bounce
608 * buffer for the (up to three) bytes that screw up the
609 * alignment.
610 */
611 offset = (SDHCI_ADMA2_ALIGN - (addr & SDHCI_ADMA2_MASK)) &
612 SDHCI_ADMA2_MASK;
613 if (offset) {
614 if (data->flags & MMC_DATA_WRITE) {
615 buffer = sdhci_kmap_atomic(sg, &flags);
616 memcpy(align, buffer, offset);
617 sdhci_kunmap_atomic(buffer, &flags);
618 }
619
620 /* tran, valid */
621 sdhci_adma_write_desc(host, desc, align_addr, offset,
622 ADMA2_TRAN_VALID);
623
624 BUG_ON(offset > 65536);
625
626 align += SDHCI_ADMA2_ALIGN;
627 align_addr += SDHCI_ADMA2_ALIGN;
628
629 desc += host->desc_sz;
630
631 addr += offset;
632 len -= offset;
633 }
634
635 BUG_ON(len > 65536);
636
637 if (len) {
638 /* tran, valid */
639 sdhci_adma_write_desc(host, desc, addr, len,
640 ADMA2_TRAN_VALID);
641 desc += host->desc_sz;
642 }
643
644 /*
645 * If this triggers then we have a calculation bug
646 * somewhere. :/
647 */
648 WARN_ON((desc - host->adma_table) >= host->adma_table_sz);
649 }
650
651 if (host->quirks & SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC) {
652 /* Mark the last descriptor as the terminating descriptor */
653 if (desc != host->adma_table) {
654 desc -= host->desc_sz;
655 sdhci_adma_mark_end(desc);
656 }
657 } else {
658 /* Add a terminating entry - nop, end, valid */
659 sdhci_adma_write_desc(host, desc, 0, 0, ADMA2_NOP_END_VALID);
660 }
661}
662
663static void sdhci_adma_table_post(struct sdhci_host *host,
664 struct mmc_data *data)
665{
666 struct scatterlist *sg;
667 int i, size;
668 void *align;
669 char *buffer;
670 unsigned long flags;
671
672 if (data->flags & MMC_DATA_READ) {
673 bool has_unaligned = false;
674
675 /* Do a quick scan of the SG list for any unaligned mappings */
676 for_each_sg(data->sg, sg, host->sg_count, i)
677 if (sg_dma_address(sg) & SDHCI_ADMA2_MASK) {
678 has_unaligned = true;
679 break;
680 }
681
682 if (has_unaligned) {
683 dma_sync_sg_for_cpu(mmc_dev(host->mmc), data->sg,
684 data->sg_len, DMA_FROM_DEVICE);
685
686 align = host->align_buffer;
687
688 for_each_sg(data->sg, sg, host->sg_count, i) {
689 if (sg_dma_address(sg) & SDHCI_ADMA2_MASK) {
690 size = SDHCI_ADMA2_ALIGN -
691 (sg_dma_address(sg) & SDHCI_ADMA2_MASK);
692
693 buffer = sdhci_kmap_atomic(sg, &flags);
694 memcpy(buffer, align, size);
695 sdhci_kunmap_atomic(buffer, &flags);
696
697 align += SDHCI_ADMA2_ALIGN;
698 }
699 }
700 }
701 }
702}
703
704static u32 sdhci_sdma_address(struct sdhci_host *host)
705{
706 if (host->bounce_buffer)
707 return host->bounce_addr;
708 else
709 return sg_dma_address(host->data->sg);
710}
711
712static u8 sdhci_calc_timeout(struct sdhci_host *host, struct mmc_command *cmd)
713{
714 u8 count;
715 struct mmc_data *data = cmd->data;
716 unsigned target_timeout, current_timeout;
717
718 /*
719 * If the host controller provides us with an incorrect timeout
720 * value, just skip the check and use 0xE. The hardware may take
721 * longer to time out, but that's much better than having a too-short
722 * timeout value.
723 */
724 if (host->quirks & SDHCI_QUIRK_BROKEN_TIMEOUT_VAL)
725 return 0xE;
726
727 /* Unspecified timeout, assume max */
728 if (!data && !cmd->busy_timeout)
729 return 0xE;
730
731 /* timeout in us */
732 if (!data)
733 target_timeout = cmd->busy_timeout * 1000;
734 else {
735 target_timeout = DIV_ROUND_UP(data->timeout_ns, 1000);
736 if (host->clock && data->timeout_clks) {
737 unsigned long long val;
738
739 /*
740 * data->timeout_clks is in units of clock cycles.
741 * host->clock is in Hz. target_timeout is in us.
742 * Hence, us = 1000000 * cycles / Hz. Round up.
743 */
744 val = 1000000ULL * data->timeout_clks;
745 if (do_div(val, host->clock))
746 target_timeout++;
747 target_timeout += val;
748 }
749 }
750
751 /*
752 * Figure out needed cycles.
753 * We do this in steps in order to fit inside a 32 bit int.
754 * The first step is the minimum timeout, which will have a
755 * minimum resolution of 6 bits:
756 * (1) 2^13*1000 > 2^22,
757 * (2) host->timeout_clk < 2^16
758 * =>
759 * (1) / (2) > 2^6
760 */
761 count = 0;
762 current_timeout = (1 << 13) * 1000 / host->timeout_clk;
763 while (current_timeout < target_timeout) {
764 count++;
765 current_timeout <<= 1;
766 if (count >= 0xF)
767 break;
768 }
769
770 if (count >= 0xF) {
771 DBG("Too large timeout 0x%x requested for CMD%d!\n",
772 count, cmd->opcode);
773 count = 0xE;
774 }
775
776 return count;
777}
778
779static void sdhci_set_transfer_irqs(struct sdhci_host *host)
780{
781 u32 pio_irqs = SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL;
782 u32 dma_irqs = SDHCI_INT_DMA_END | SDHCI_INT_ADMA_ERROR;
783
784 if (host->flags & SDHCI_REQ_USE_DMA)
785 host->ier = (host->ier & ~pio_irqs) | dma_irqs;
786 else
787 host->ier = (host->ier & ~dma_irqs) | pio_irqs;
788
789 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
790 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
791}
792
793static void sdhci_set_timeout(struct sdhci_host *host, struct mmc_command *cmd)
794{
795 u8 count;
796
797 if (host->ops->set_timeout) {
798 host->ops->set_timeout(host, cmd);
799 } else {
800 count = sdhci_calc_timeout(host, cmd);
801 sdhci_writeb(host, count, SDHCI_TIMEOUT_CONTROL);
802 }
803}
804
805static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd)
806{
807 u8 ctrl;
808 struct mmc_data *data = cmd->data;
809
810 if (sdhci_data_line_cmd(cmd))
811 sdhci_set_timeout(host, cmd);
812
813 if (!data)
814 return;
815
816 WARN_ON(host->data);
817
818 /* Sanity checks */
819 BUG_ON(data->blksz * data->blocks > 524288);
820 BUG_ON(data->blksz > host->mmc->max_blk_size);
821 BUG_ON(data->blocks > 65535);
822
823 host->data = data;
824 host->data_early = 0;
825 host->data->bytes_xfered = 0;
826
827 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
828 struct scatterlist *sg;
829 unsigned int length_mask, offset_mask;
830 int i;
831
832 host->flags |= SDHCI_REQ_USE_DMA;
833
834 /*
835 * FIXME: This doesn't account for merging when mapping the
836 * scatterlist.
837 *
838 * The assumption here being that alignment and lengths are
839 * the same after DMA mapping to device address space.
840 */
841 length_mask = 0;
842 offset_mask = 0;
843 if (host->flags & SDHCI_USE_ADMA) {
844 if (host->quirks & SDHCI_QUIRK_32BIT_ADMA_SIZE) {
845 length_mask = 3;
846 /*
847 * As we use up to 3 byte chunks to work
848 * around alignment problems, we need to
849 * check the offset as well.
850 */
851 offset_mask = 3;
852 }
853 } else {
854 if (host->quirks & SDHCI_QUIRK_32BIT_DMA_SIZE)
855 length_mask = 3;
856 if (host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR)
857 offset_mask = 3;
858 }
859
860 if (unlikely(length_mask | offset_mask)) {
861 for_each_sg(data->sg, sg, data->sg_len, i) {
862 if (sg->length & length_mask) {
863 DBG("Reverting to PIO because of transfer size (%d)\n",
864 sg->length);
865 host->flags &= ~SDHCI_REQ_USE_DMA;
866 break;
867 }
868 if (sg->offset & offset_mask) {
869 DBG("Reverting to PIO because of bad alignment\n");
870 host->flags &= ~SDHCI_REQ_USE_DMA;
871 break;
872 }
873 }
874 }
875 }
876
877 if (host->flags & SDHCI_REQ_USE_DMA) {
878 int sg_cnt = sdhci_pre_dma_transfer(host, data, COOKIE_MAPPED);
879
880 if (sg_cnt <= 0) {
881 /*
882 * This only happens when someone fed
883 * us an invalid request.
884 */
885 WARN_ON(1);
886 host->flags &= ~SDHCI_REQ_USE_DMA;
887 } else if (host->flags & SDHCI_USE_ADMA) {
888 sdhci_adma_table_pre(host, data, sg_cnt);
889
890 sdhci_writel(host, host->adma_addr, SDHCI_ADMA_ADDRESS);
891 if (host->flags & SDHCI_USE_64_BIT_DMA)
892 sdhci_writel(host,
893 (u64)host->adma_addr >> 32,
894 SDHCI_ADMA_ADDRESS_HI);
895 } else {
896 WARN_ON(sg_cnt != 1);
897 sdhci_writel(host, sdhci_sdma_address(host),
898 SDHCI_DMA_ADDRESS);
899 }
900 }
901
902 /*
903 * Always adjust the DMA selection as some controllers
904 * (e.g. JMicron) can't do PIO properly when the selection
905 * is ADMA.
906 */
907 if (host->version >= SDHCI_SPEC_200) {
908 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
909 ctrl &= ~SDHCI_CTRL_DMA_MASK;
910 if ((host->flags & SDHCI_REQ_USE_DMA) &&
911 (host->flags & SDHCI_USE_ADMA)) {
912 if (host->flags & SDHCI_USE_64_BIT_DMA)
913 ctrl |= SDHCI_CTRL_ADMA64;
914 else
915 ctrl |= SDHCI_CTRL_ADMA32;
916 } else {
917 ctrl |= SDHCI_CTRL_SDMA;
918 }
919 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
920 }
921
922 if (!(host->flags & SDHCI_REQ_USE_DMA)) {
923 int flags;
924
925 flags = SG_MITER_ATOMIC;
926 if (host->data->flags & MMC_DATA_READ)
927 flags |= SG_MITER_TO_SG;
928 else
929 flags |= SG_MITER_FROM_SG;
930 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
931 host->blocks = data->blocks;
932 }
933
934 sdhci_set_transfer_irqs(host);
935
936 /* Set the DMA boundary value and block size */
937 sdhci_writew(host, SDHCI_MAKE_BLKSZ(host->sdma_boundary, data->blksz),
938 SDHCI_BLOCK_SIZE);
939 sdhci_writew(host, data->blocks, SDHCI_BLOCK_COUNT);
940}
941
942static inline bool sdhci_auto_cmd12(struct sdhci_host *host,
943 struct mmc_request *mrq)
944{
945 return !mrq->sbc && (host->flags & SDHCI_AUTO_CMD12) &&
946 !mrq->cap_cmd_during_tfr;
947}
948
949static void sdhci_set_transfer_mode(struct sdhci_host *host,
950 struct mmc_command *cmd)
951{
952 u16 mode = 0;
953 struct mmc_data *data = cmd->data;
954
955 if (data == NULL) {
956 if (host->quirks2 &
957 SDHCI_QUIRK2_CLEAR_TRANSFERMODE_REG_BEFORE_CMD) {
958 sdhci_writew(host, 0x0, SDHCI_TRANSFER_MODE);
959 } else {
960 /* clear Auto CMD settings for no data CMDs */
961 mode = sdhci_readw(host, SDHCI_TRANSFER_MODE);
962 sdhci_writew(host, mode & ~(SDHCI_TRNS_AUTO_CMD12 |
963 SDHCI_TRNS_AUTO_CMD23), SDHCI_TRANSFER_MODE);
964 }
965 return;
966 }
967
968 WARN_ON(!host->data);
969
970 if (!(host->quirks2 & SDHCI_QUIRK2_SUPPORT_SINGLE))
971 mode = SDHCI_TRNS_BLK_CNT_EN;
972
973 if (mmc_op_multi(cmd->opcode) || data->blocks > 1) {
974 mode = SDHCI_TRNS_BLK_CNT_EN | SDHCI_TRNS_MULTI;
975 /*
976 * If we are sending CMD23, CMD12 never gets sent
977 * on successful completion (so no Auto-CMD12).
978 */
979 if (sdhci_auto_cmd12(host, cmd->mrq) &&
980 (cmd->opcode != SD_IO_RW_EXTENDED))
981 mode |= SDHCI_TRNS_AUTO_CMD12;
982 else if (cmd->mrq->sbc && (host->flags & SDHCI_AUTO_CMD23)) {
983 mode |= SDHCI_TRNS_AUTO_CMD23;
984 sdhci_writel(host, cmd->mrq->sbc->arg, SDHCI_ARGUMENT2);
985 }
986 }
987
988 if (data->flags & MMC_DATA_READ)
989 mode |= SDHCI_TRNS_READ;
990 if (host->flags & SDHCI_REQ_USE_DMA)
991 mode |= SDHCI_TRNS_DMA;
992
993 sdhci_writew(host, mode, SDHCI_TRANSFER_MODE);
994}
995
996static bool sdhci_needs_reset(struct sdhci_host *host, struct mmc_request *mrq)
997{
998 return (!(host->flags & SDHCI_DEVICE_DEAD) &&
999 ((mrq->cmd && mrq->cmd->error) ||
1000 (mrq->sbc && mrq->sbc->error) ||
1001 (mrq->data && ((mrq->data->error && !mrq->data->stop) ||
1002 (mrq->data->stop && mrq->data->stop->error))) ||
1003 (host->quirks & SDHCI_QUIRK_RESET_AFTER_REQUEST)));
1004}
1005
1006static void __sdhci_finish_mrq(struct sdhci_host *host, struct mmc_request *mrq)
1007{
1008 int i;
1009
1010 for (i = 0; i < SDHCI_MAX_MRQS; i++) {
1011 if (host->mrqs_done[i] == mrq) {
1012 WARN_ON(1);
1013 return;
1014 }
1015 }
1016
1017 for (i = 0; i < SDHCI_MAX_MRQS; i++) {
1018 if (!host->mrqs_done[i]) {
1019 host->mrqs_done[i] = mrq;
1020 break;
1021 }
1022 }
1023
1024 WARN_ON(i >= SDHCI_MAX_MRQS);
1025
1026 tasklet_schedule(&host->finish_tasklet);
1027}
1028
1029static void sdhci_finish_mrq(struct sdhci_host *host, struct mmc_request *mrq)
1030{
1031 if (host->cmd && host->cmd->mrq == mrq)
1032 host->cmd = NULL;
1033
1034 if (host->data_cmd && host->data_cmd->mrq == mrq)
1035 host->data_cmd = NULL;
1036
1037 if (host->data && host->data->mrq == mrq)
1038 host->data = NULL;
1039
1040 if (sdhci_needs_reset(host, mrq))
1041 host->pending_reset = true;
1042
1043 __sdhci_finish_mrq(host, mrq);
1044}
1045
1046static void sdhci_finish_data(struct sdhci_host *host)
1047{
1048 struct mmc_command *data_cmd = host->data_cmd;
1049 struct mmc_data *data = host->data;
1050
1051 host->data = NULL;
1052 host->data_cmd = NULL;
1053
1054 if ((host->flags & (SDHCI_REQ_USE_DMA | SDHCI_USE_ADMA)) ==
1055 (SDHCI_REQ_USE_DMA | SDHCI_USE_ADMA))
1056 sdhci_adma_table_post(host, data);
1057
1058 /*
1059 * The specification states that the block count register must
1060 * be updated, but it does not specify at what point in the
1061 * data flow. That makes the register entirely useless to read
1062 * back so we have to assume that nothing made it to the card
1063 * in the event of an error.
1064 */
1065 if (data->error)
1066 data->bytes_xfered = 0;
1067 else
1068 data->bytes_xfered = data->blksz * data->blocks;
1069
1070 /*
1071 * Need to send CMD12 if -
1072 * a) open-ended multiblock transfer (no CMD23)
1073 * b) error in multiblock transfer
1074 */
1075 if (data->stop &&
1076 (data->error ||
1077 !data->mrq->sbc)) {
1078
1079 /*
1080 * The controller needs a reset of internal state machines
1081 * upon error conditions.
1082 */
1083 if (data->error) {
1084 if (!host->cmd || host->cmd == data_cmd)
1085 sdhci_do_reset(host, SDHCI_RESET_CMD);
1086 sdhci_do_reset(host, SDHCI_RESET_DATA);
1087 }
1088
1089 /*
1090 * 'cap_cmd_during_tfr' request must not use the command line
1091 * after mmc_command_done() has been called. It is upper layer's
1092 * responsibility to send the stop command if required.
1093 */
1094 if (data->mrq->cap_cmd_during_tfr) {
1095 sdhci_finish_mrq(host, data->mrq);
1096 } else {
1097 /* Avoid triggering warning in sdhci_send_command() */
1098 host->cmd = NULL;
1099 sdhci_send_command(host, data->stop);
1100 }
1101 } else {
1102 sdhci_finish_mrq(host, data->mrq);
1103 }
1104}
1105
1106static void sdhci_mod_timer(struct sdhci_host *host, struct mmc_request *mrq,
1107 unsigned long timeout)
1108{
1109 if (sdhci_data_line_cmd(mrq->cmd))
1110 mod_timer(&host->data_timer, timeout);
1111 else
1112 mod_timer(&host->timer, timeout);
1113}
1114
1115static void sdhci_del_timer(struct sdhci_host *host, struct mmc_request *mrq)
1116{
1117 if (sdhci_data_line_cmd(mrq->cmd))
1118 del_timer(&host->data_timer);
1119 else
1120 del_timer(&host->timer);
1121}
1122
1123void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
1124{
1125 int flags;
1126 u32 mask;
1127 unsigned long timeout;
1128
1129 WARN_ON(host->cmd);
1130
1131 /* Initially, a command has no error */
1132 cmd->error = 0;
1133
1134 if ((host->quirks2 & SDHCI_QUIRK2_STOP_WITH_TC) &&
1135 cmd->opcode == MMC_STOP_TRANSMISSION)
1136 cmd->flags |= MMC_RSP_BUSY;
1137
1138 /* Wait max 10 ms */
1139 timeout = 10;
1140
1141 mask = SDHCI_CMD_INHIBIT;
1142 if (sdhci_data_line_cmd(cmd))
1143 mask |= SDHCI_DATA_INHIBIT;
1144
1145 /* We shouldn't wait for data inihibit for stop commands, even
1146 though they might use busy signaling */
1147 if (cmd->mrq->data && (cmd == cmd->mrq->data->stop))
1148 mask &= ~SDHCI_DATA_INHIBIT;
1149
1150 while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) {
1151 if (timeout == 0) {
1152 pr_err("%s: Controller never released inhibit bit(s).\n",
1153 mmc_hostname(host->mmc));
1154 sdhci_dumpregs(host);
1155 cmd->error = -EIO;
1156 sdhci_finish_mrq(host, cmd->mrq);
1157 return;
1158 }
1159 timeout--;
1160 mdelay(1);
1161 }
1162
1163 timeout = jiffies;
1164 if (!cmd->data && cmd->busy_timeout > 9000)
1165 timeout += DIV_ROUND_UP(cmd->busy_timeout, 1000) * HZ + HZ;
1166 else
1167 timeout += 10 * HZ;
1168 sdhci_mod_timer(host, cmd->mrq, timeout);
1169
1170 host->cmd = cmd;
1171 if (sdhci_data_line_cmd(cmd)) {
1172 WARN_ON(host->data_cmd);
1173 host->data_cmd = cmd;
1174 }
1175
1176 sdhci_prepare_data(host, cmd);
1177
1178 sdhci_writel(host, cmd->arg, SDHCI_ARGUMENT);
1179
1180 sdhci_set_transfer_mode(host, cmd);
1181
1182 if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
1183 pr_err("%s: Unsupported response type!\n",
1184 mmc_hostname(host->mmc));
1185 cmd->error = -EINVAL;
1186 sdhci_finish_mrq(host, cmd->mrq);
1187 return;
1188 }
1189
1190 if (!(cmd->flags & MMC_RSP_PRESENT))
1191 flags = SDHCI_CMD_RESP_NONE;
1192 else if (cmd->flags & MMC_RSP_136)
1193 flags = SDHCI_CMD_RESP_LONG;
1194 else if (cmd->flags & MMC_RSP_BUSY)
1195 flags = SDHCI_CMD_RESP_SHORT_BUSY;
1196 else
1197 flags = SDHCI_CMD_RESP_SHORT;
1198
1199 if (cmd->flags & MMC_RSP_CRC)
1200 flags |= SDHCI_CMD_CRC;
1201 if (cmd->flags & MMC_RSP_OPCODE)
1202 flags |= SDHCI_CMD_INDEX;
1203
1204 /* CMD19 is special in that the Data Present Select should be set */
1205 if (cmd->data || cmd->opcode == MMC_SEND_TUNING_BLOCK ||
1206 cmd->opcode == MMC_SEND_TUNING_BLOCK_HS200)
1207 flags |= SDHCI_CMD_DATA;
1208
1209 sdhci_writew(host, SDHCI_MAKE_CMD(cmd->opcode, flags), SDHCI_COMMAND);
1210}
1211EXPORT_SYMBOL_GPL(sdhci_send_command);
1212
1213static void sdhci_read_rsp_136(struct sdhci_host *host, struct mmc_command *cmd)
1214{
1215 int i, reg;
1216
1217 for (i = 0; i < 4; i++) {
1218 reg = SDHCI_RESPONSE + (3 - i) * 4;
1219 cmd->resp[i] = sdhci_readl(host, reg);
1220 }
1221
1222 if (host->quirks2 & SDHCI_QUIRK2_RSP_136_HAS_CRC)
1223 return;
1224
1225 /* CRC is stripped so we need to do some shifting */
1226 for (i = 0; i < 4; i++) {
1227 cmd->resp[i] <<= 8;
1228 if (i != 3)
1229 cmd->resp[i] |= cmd->resp[i + 1] >> 24;
1230 }
1231}
1232
1233static void sdhci_finish_command(struct sdhci_host *host)
1234{
1235 struct mmc_command *cmd = host->cmd;
1236
1237 host->cmd = NULL;
1238
1239 if (cmd->flags & MMC_RSP_PRESENT) {
1240 if (cmd->flags & MMC_RSP_136) {
1241 sdhci_read_rsp_136(host, cmd);
1242 } else {
1243 cmd->resp[0] = sdhci_readl(host, SDHCI_RESPONSE);
1244 }
1245 }
1246
1247 if (cmd->mrq->cap_cmd_during_tfr && cmd == cmd->mrq->cmd)
1248 mmc_command_done(host->mmc, cmd->mrq);
1249
1250 /*
1251 * The host can send and interrupt when the busy state has
1252 * ended, allowing us to wait without wasting CPU cycles.
1253 * The busy signal uses DAT0 so this is similar to waiting
1254 * for data to complete.
1255 *
1256 * Note: The 1.0 specification is a bit ambiguous about this
1257 * feature so there might be some problems with older
1258 * controllers.
1259 */
1260 if (cmd->flags & MMC_RSP_BUSY) {
1261 if (cmd->data) {
1262 DBG("Cannot wait for busy signal when also doing a data transfer");
1263 } else if (!(host->quirks & SDHCI_QUIRK_NO_BUSY_IRQ) &&
1264 cmd == host->data_cmd) {
1265 /* Command complete before busy is ended */
1266 return;
1267 }
1268 }
1269
1270 /* Finished CMD23, now send actual command. */
1271 if (cmd == cmd->mrq->sbc) {
1272 sdhci_send_command(host, cmd->mrq->cmd);
1273 } else {
1274
1275 /* Processed actual command. */
1276 if (host->data && host->data_early)
1277 sdhci_finish_data(host);
1278
1279 if (!cmd->data)
1280 sdhci_finish_mrq(host, cmd->mrq);
1281 }
1282}
1283
1284static u16 sdhci_get_preset_value(struct sdhci_host *host)
1285{
1286 u16 preset = 0;
1287
1288 switch (host->timing) {
1289 case MMC_TIMING_UHS_SDR12:
1290 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR12);
1291 break;
1292 case MMC_TIMING_UHS_SDR25:
1293 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR25);
1294 break;
1295 case MMC_TIMING_UHS_SDR50:
1296 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR50);
1297 break;
1298 case MMC_TIMING_UHS_SDR104:
1299 case MMC_TIMING_MMC_HS200:
1300 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR104);
1301 break;
1302 case MMC_TIMING_UHS_DDR50:
1303 case MMC_TIMING_MMC_DDR52:
1304 preset = sdhci_readw(host, SDHCI_PRESET_FOR_DDR50);
1305 break;
1306 case MMC_TIMING_MMC_HS400:
1307 preset = sdhci_readw(host, SDHCI_PRESET_FOR_HS400);
1308 break;
1309 default:
1310 pr_warn("%s: Invalid UHS-I mode selected\n",
1311 mmc_hostname(host->mmc));
1312 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR12);
1313 break;
1314 }
1315 return preset;
1316}
1317
1318u16 sdhci_calc_clk(struct sdhci_host *host, unsigned int clock,
1319 unsigned int *actual_clock)
1320{
1321 int div = 0; /* Initialized for compiler warning */
1322 int real_div = div, clk_mul = 1;
1323 u16 clk = 0;
1324 bool switch_base_clk = false;
1325
1326 if (host->version >= SDHCI_SPEC_300) {
1327 if (host->preset_enabled) {
1328 u16 pre_val;
1329
1330 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1331 pre_val = sdhci_get_preset_value(host);
1332 div = (pre_val & SDHCI_PRESET_SDCLK_FREQ_MASK)
1333 >> SDHCI_PRESET_SDCLK_FREQ_SHIFT;
1334 if (host->clk_mul &&
1335 (pre_val & SDHCI_PRESET_CLKGEN_SEL_MASK)) {
1336 clk = SDHCI_PROG_CLOCK_MODE;
1337 real_div = div + 1;
1338 clk_mul = host->clk_mul;
1339 } else {
1340 real_div = max_t(int, 1, div << 1);
1341 }
1342 goto clock_set;
1343 }
1344
1345 /*
1346 * Check if the Host Controller supports Programmable Clock
1347 * Mode.
1348 */
1349 if (host->clk_mul) {
1350 for (div = 1; div <= 1024; div++) {
1351 if ((host->max_clk * host->clk_mul / div)
1352 <= clock)
1353 break;
1354 }
1355 if ((host->max_clk * host->clk_mul / div) <= clock) {
1356 /*
1357 * Set Programmable Clock Mode in the Clock
1358 * Control register.
1359 */
1360 clk = SDHCI_PROG_CLOCK_MODE;
1361 real_div = div;
1362 clk_mul = host->clk_mul;
1363 div--;
1364 } else {
1365 /*
1366 * Divisor can be too small to reach clock
1367 * speed requirement. Then use the base clock.
1368 */
1369 switch_base_clk = true;
1370 }
1371 }
1372
1373 if (!host->clk_mul || switch_base_clk) {
1374 /* Version 3.00 divisors must be a multiple of 2. */
1375 if (host->max_clk <= clock)
1376 div = 1;
1377 else {
1378 for (div = 2; div < SDHCI_MAX_DIV_SPEC_300;
1379 div += 2) {
1380 if ((host->max_clk / div) <= clock)
1381 break;
1382 }
1383 }
1384 real_div = div;
1385 div >>= 1;
1386 if ((host->quirks2 & SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN)
1387 && !div && host->max_clk <= 25000000)
1388 div = 1;
1389 }
1390 } else {
1391 /* Version 2.00 divisors must be a power of 2. */
1392 for (div = 1; div < SDHCI_MAX_DIV_SPEC_200; div *= 2) {
1393 if ((host->max_clk / div) <= clock)
1394 break;
1395 }
1396 real_div = div;
1397 div >>= 1;
1398 }
1399
1400clock_set:
1401 if (real_div)
1402 *actual_clock = (host->max_clk * clk_mul) / real_div;
1403 clk |= (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT;
1404 clk |= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN)
1405 << SDHCI_DIVIDER_HI_SHIFT;
1406
1407 return clk;
1408}
1409EXPORT_SYMBOL_GPL(sdhci_calc_clk);
1410
1411void sdhci_enable_clk(struct sdhci_host *host, u16 clk)
1412{
1413 ktime_t timeout;
1414
1415 clk |= SDHCI_CLOCK_INT_EN;
1416 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1417
1418 /* Wait max 20 ms */
1419 timeout = ktime_add_ms(ktime_get(), 20);
1420 while (!((clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL))
1421 & SDHCI_CLOCK_INT_STABLE)) {
1422 if (ktime_after(ktime_get(), timeout)) {
1423 pr_err("%s: Internal clock never stabilised.\n",
1424 mmc_hostname(host->mmc));
1425 sdhci_dumpregs(host);
1426 return;
1427 }
1428 udelay(10);
1429 }
1430
1431 clk |= SDHCI_CLOCK_CARD_EN;
1432 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1433}
1434EXPORT_SYMBOL_GPL(sdhci_enable_clk);
1435
1436void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
1437{
1438 u16 clk;
1439
1440 host->mmc->actual_clock = 0;
1441
1442 sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
1443
1444 if (clock == 0)
1445 return;
1446
1447 clk = sdhci_calc_clk(host, clock, &host->mmc->actual_clock);
1448 sdhci_enable_clk(host, clk);
1449}
1450EXPORT_SYMBOL_GPL(sdhci_set_clock);
1451
1452static void sdhci_set_power_reg(struct sdhci_host *host, unsigned char mode,
1453 unsigned short vdd)
1454{
1455 struct mmc_host *mmc = host->mmc;
1456
1457 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
1458
1459 if (mode != MMC_POWER_OFF)
1460 sdhci_writeb(host, SDHCI_POWER_ON, SDHCI_POWER_CONTROL);
1461 else
1462 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
1463}
1464
1465void sdhci_set_power_noreg(struct sdhci_host *host, unsigned char mode,
1466 unsigned short vdd)
1467{
1468 u8 pwr = 0;
1469
1470 if (mode != MMC_POWER_OFF) {
1471 switch (1 << vdd) {
1472 case MMC_VDD_165_195:
1473 /*
1474 * Without a regulator, SDHCI does not support 2.0v
1475 * so we only get here if the driver deliberately
1476 * added the 2.0v range to ocr_avail. Map it to 1.8v
1477 * for the purpose of turning on the power.
1478 */
1479 case MMC_VDD_20_21:
1480 pwr = SDHCI_POWER_180;
1481 break;
1482 case MMC_VDD_29_30:
1483 case MMC_VDD_30_31:
1484 pwr = SDHCI_POWER_300;
1485 break;
1486 case MMC_VDD_32_33:
1487 case MMC_VDD_33_34:
1488 pwr = SDHCI_POWER_330;
1489 break;
1490 default:
1491 WARN(1, "%s: Invalid vdd %#x\n",
1492 mmc_hostname(host->mmc), vdd);
1493 break;
1494 }
1495 }
1496
1497 if (host->pwr == pwr)
1498 return;
1499
1500 host->pwr = pwr;
1501
1502 if (pwr == 0) {
1503 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
1504 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
1505 sdhci_runtime_pm_bus_off(host);
1506 } else {
1507 /*
1508 * Spec says that we should clear the power reg before setting
1509 * a new value. Some controllers don't seem to like this though.
1510 */
1511 if (!(host->quirks & SDHCI_QUIRK_SINGLE_POWER_WRITE))
1512 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
1513
1514 /*
1515 * At least the Marvell CaFe chip gets confused if we set the
1516 * voltage and set turn on power at the same time, so set the
1517 * voltage first.
1518 */
1519 if (host->quirks & SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER)
1520 sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
1521
1522 pwr |= SDHCI_POWER_ON;
1523
1524 sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
1525
1526 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
1527 sdhci_runtime_pm_bus_on(host);
1528
1529 /*
1530 * Some controllers need an extra 10ms delay of 10ms before
1531 * they can apply clock after applying power
1532 */
1533 if (host->quirks & SDHCI_QUIRK_DELAY_AFTER_POWER)
1534 mdelay(10);
1535 }
1536}
1537EXPORT_SYMBOL_GPL(sdhci_set_power_noreg);
1538
1539void sdhci_set_power(struct sdhci_host *host, unsigned char mode,
1540 unsigned short vdd)
1541{
1542 if (IS_ERR(host->mmc->supply.vmmc))
1543 sdhci_set_power_noreg(host, mode, vdd);
1544 else
1545 sdhci_set_power_reg(host, mode, vdd);
1546}
1547EXPORT_SYMBOL_GPL(sdhci_set_power);
1548
1549/*****************************************************************************\
1550 * *
1551 * MMC callbacks *
1552 * *
1553\*****************************************************************************/
1554
1555static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
1556{
1557 struct sdhci_host *host;
1558 int present;
1559 unsigned long flags;
1560
1561 host = mmc_priv(mmc);
1562
1563 /* Firstly check card presence */
1564 present = mmc->ops->get_cd(mmc);
1565
1566 spin_lock_irqsave(&host->lock, flags);
1567
1568 sdhci_led_activate(host);
1569
1570 /*
1571 * Ensure we don't send the STOP for non-SET_BLOCK_COUNTED
1572 * requests if Auto-CMD12 is enabled.
1573 */
1574 if (sdhci_auto_cmd12(host, mrq)) {
1575 if (mrq->stop) {
1576 mrq->data->stop = NULL;
1577 mrq->stop = NULL;
1578 }
1579 }
1580
1581 if (!present || host->flags & SDHCI_DEVICE_DEAD) {
1582 mrq->cmd->error = -ENOMEDIUM;
1583 sdhci_finish_mrq(host, mrq);
1584 } else {
1585 if (mrq->sbc && !(host->flags & SDHCI_AUTO_CMD23))
1586 sdhci_send_command(host, mrq->sbc);
1587 else
1588 sdhci_send_command(host, mrq->cmd);
1589 }
1590
1591 mmiowb();
1592 spin_unlock_irqrestore(&host->lock, flags);
1593}
1594
1595void sdhci_set_bus_width(struct sdhci_host *host, int width)
1596{
1597 u8 ctrl;
1598
1599 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
1600 if (width == MMC_BUS_WIDTH_8) {
1601 ctrl &= ~SDHCI_CTRL_4BITBUS;
1602 ctrl |= SDHCI_CTRL_8BITBUS;
1603 } else {
1604 if (host->mmc->caps & MMC_CAP_8_BIT_DATA)
1605 ctrl &= ~SDHCI_CTRL_8BITBUS;
1606 if (width == MMC_BUS_WIDTH_4)
1607 ctrl |= SDHCI_CTRL_4BITBUS;
1608 else
1609 ctrl &= ~SDHCI_CTRL_4BITBUS;
1610 }
1611 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1612}
1613EXPORT_SYMBOL_GPL(sdhci_set_bus_width);
1614
1615void sdhci_set_uhs_signaling(struct sdhci_host *host, unsigned timing)
1616{
1617 u16 ctrl_2;
1618
1619 ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1620 /* Select Bus Speed Mode for host */
1621 ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
1622 if ((timing == MMC_TIMING_MMC_HS200) ||
1623 (timing == MMC_TIMING_UHS_SDR104))
1624 ctrl_2 |= SDHCI_CTRL_UHS_SDR104;
1625 else if (timing == MMC_TIMING_UHS_SDR12)
1626 ctrl_2 |= SDHCI_CTRL_UHS_SDR12;
1627 else if (timing == MMC_TIMING_UHS_SDR25)
1628 ctrl_2 |= SDHCI_CTRL_UHS_SDR25;
1629 else if (timing == MMC_TIMING_UHS_SDR50)
1630 ctrl_2 |= SDHCI_CTRL_UHS_SDR50;
1631 else if ((timing == MMC_TIMING_UHS_DDR50) ||
1632 (timing == MMC_TIMING_MMC_DDR52))
1633 ctrl_2 |= SDHCI_CTRL_UHS_DDR50;
1634 else if (timing == MMC_TIMING_MMC_HS400)
1635 ctrl_2 |= SDHCI_CTRL_HS400; /* Non-standard */
1636 sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
1637}
1638EXPORT_SYMBOL_GPL(sdhci_set_uhs_signaling);
1639
1640void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1641{
1642 struct sdhci_host *host = mmc_priv(mmc);
1643 u8 ctrl;
1644
1645 if (ios->power_mode == MMC_POWER_UNDEFINED)
1646 return;
1647
1648 if (host->flags & SDHCI_DEVICE_DEAD) {
1649 if (!IS_ERR(mmc->supply.vmmc) &&
1650 ios->power_mode == MMC_POWER_OFF)
1651 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
1652 return;
1653 }
1654
1655 /*
1656 * Reset the chip on each power off.
1657 * Should clear out any weird states.
1658 */
1659 if (ios->power_mode == MMC_POWER_OFF) {
1660 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
1661 sdhci_reinit(host);
1662 }
1663
1664 if (host->version >= SDHCI_SPEC_300 &&
1665 (ios->power_mode == MMC_POWER_UP) &&
1666 !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN))
1667 sdhci_enable_preset_value(host, false);
1668
1669 if (!ios->clock || ios->clock != host->clock) {
1670 host->ops->set_clock(host, ios->clock);
1671 host->clock = ios->clock;
1672
1673 if (host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK &&
1674 host->clock) {
1675 host->timeout_clk = host->mmc->actual_clock ?
1676 host->mmc->actual_clock / 1000 :
1677 host->clock / 1000;
1678 host->mmc->max_busy_timeout =
1679 host->ops->get_max_timeout_count ?
1680 host->ops->get_max_timeout_count(host) :
1681 1 << 27;
1682 host->mmc->max_busy_timeout /= host->timeout_clk;
1683 }
1684 }
1685
1686 if (host->ops->set_power)
1687 host->ops->set_power(host, ios->power_mode, ios->vdd);
1688 else
1689 sdhci_set_power(host, ios->power_mode, ios->vdd);
1690
1691 if (host->ops->platform_send_init_74_clocks)
1692 host->ops->platform_send_init_74_clocks(host, ios->power_mode);
1693
1694 host->ops->set_bus_width(host, ios->bus_width);
1695
1696 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
1697
1698 if (!(host->quirks & SDHCI_QUIRK_NO_HISPD_BIT)) {
1699 if (ios->timing == MMC_TIMING_SD_HS ||
1700 ios->timing == MMC_TIMING_MMC_HS ||
1701 ios->timing == MMC_TIMING_MMC_HS400 ||
1702 ios->timing == MMC_TIMING_MMC_HS200 ||
1703 ios->timing == MMC_TIMING_MMC_DDR52 ||
1704 ios->timing == MMC_TIMING_UHS_SDR50 ||
1705 ios->timing == MMC_TIMING_UHS_SDR104 ||
1706 ios->timing == MMC_TIMING_UHS_DDR50 ||
1707 ios->timing == MMC_TIMING_UHS_SDR25)
1708 ctrl |= SDHCI_CTRL_HISPD;
1709 else
1710 ctrl &= ~SDHCI_CTRL_HISPD;
1711 }
1712
1713 if (host->version >= SDHCI_SPEC_300) {
1714 u16 clk, ctrl_2;
1715
1716 if (!host->preset_enabled) {
1717 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1718 /*
1719 * We only need to set Driver Strength if the
1720 * preset value enable is not set.
1721 */
1722 ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1723 ctrl_2 &= ~SDHCI_CTRL_DRV_TYPE_MASK;
1724 if (ios->drv_type == MMC_SET_DRIVER_TYPE_A)
1725 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_A;
1726 else if (ios->drv_type == MMC_SET_DRIVER_TYPE_B)
1727 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_B;
1728 else if (ios->drv_type == MMC_SET_DRIVER_TYPE_C)
1729 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_C;
1730 else if (ios->drv_type == MMC_SET_DRIVER_TYPE_D)
1731 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_D;
1732 else {
1733 pr_warn("%s: invalid driver type, default to driver type B\n",
1734 mmc_hostname(mmc));
1735 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_B;
1736 }
1737
1738 sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
1739 } else {
1740 /*
1741 * According to SDHC Spec v3.00, if the Preset Value
1742 * Enable in the Host Control 2 register is set, we
1743 * need to reset SD Clock Enable before changing High
1744 * Speed Enable to avoid generating clock gliches.
1745 */
1746
1747 /* Reset SD Clock Enable */
1748 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1749 clk &= ~SDHCI_CLOCK_CARD_EN;
1750 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1751
1752 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1753
1754 /* Re-enable SD Clock */
1755 host->ops->set_clock(host, host->clock);
1756 }
1757
1758 /* Reset SD Clock Enable */
1759 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1760 clk &= ~SDHCI_CLOCK_CARD_EN;
1761 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1762
1763 host->ops->set_uhs_signaling(host, ios->timing);
1764 host->timing = ios->timing;
1765
1766 if (!(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN) &&
1767 ((ios->timing == MMC_TIMING_UHS_SDR12) ||
1768 (ios->timing == MMC_TIMING_UHS_SDR25) ||
1769 (ios->timing == MMC_TIMING_UHS_SDR50) ||
1770 (ios->timing == MMC_TIMING_UHS_SDR104) ||
1771 (ios->timing == MMC_TIMING_UHS_DDR50) ||
1772 (ios->timing == MMC_TIMING_MMC_DDR52))) {
1773 u16 preset;
1774
1775 sdhci_enable_preset_value(host, true);
1776 preset = sdhci_get_preset_value(host);
1777 ios->drv_type = (preset & SDHCI_PRESET_DRV_MASK)
1778 >> SDHCI_PRESET_DRV_SHIFT;
1779 }
1780
1781 /* Re-enable SD Clock */
1782 host->ops->set_clock(host, host->clock);
1783 } else
1784 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1785
1786 /*
1787 * Some (ENE) controllers go apeshit on some ios operation,
1788 * signalling timeout and CRC errors even on CMD0. Resetting
1789 * it on each ios seems to solve the problem.
1790 */
1791 if (host->quirks & SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS)
1792 sdhci_do_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
1793
1794 mmiowb();
1795}
1796EXPORT_SYMBOL_GPL(sdhci_set_ios);
1797
1798static int sdhci_get_cd(struct mmc_host *mmc)
1799{
1800 struct sdhci_host *host = mmc_priv(mmc);
1801 int gpio_cd = mmc_gpio_get_cd(mmc);
1802
1803 if (host->flags & SDHCI_DEVICE_DEAD)
1804 return 0;
1805
1806 /* If nonremovable, assume that the card is always present. */
1807 if (!mmc_card_is_removable(host->mmc))
1808 return 1;
1809
1810 /*
1811 * Try slot gpio detect, if defined it take precedence
1812 * over build in controller functionality
1813 */
1814 if (gpio_cd >= 0)
1815 return !!gpio_cd;
1816
1817 /* If polling, assume that the card is always present. */
1818 if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
1819 return 1;
1820
1821 /* Host native card detect */
1822 return !!(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT);
1823}
1824
1825static int sdhci_check_ro(struct sdhci_host *host)
1826{
1827 unsigned long flags;
1828 int is_readonly;
1829
1830 spin_lock_irqsave(&host->lock, flags);
1831
1832 if (host->flags & SDHCI_DEVICE_DEAD)
1833 is_readonly = 0;
1834 else if (host->ops->get_ro)
1835 is_readonly = host->ops->get_ro(host);
1836 else
1837 is_readonly = !(sdhci_readl(host, SDHCI_PRESENT_STATE)
1838 & SDHCI_WRITE_PROTECT);
1839
1840 spin_unlock_irqrestore(&host->lock, flags);
1841
1842 /* This quirk needs to be replaced by a callback-function later */
1843 return host->quirks & SDHCI_QUIRK_INVERTED_WRITE_PROTECT ?
1844 !is_readonly : is_readonly;
1845}
1846
1847#define SAMPLE_COUNT 5
1848
1849static int sdhci_get_ro(struct mmc_host *mmc)
1850{
1851 struct sdhci_host *host = mmc_priv(mmc);
1852 int i, ro_count;
1853
1854 if (!(host->quirks & SDHCI_QUIRK_UNSTABLE_RO_DETECT))
1855 return sdhci_check_ro(host);
1856
1857 ro_count = 0;
1858 for (i = 0; i < SAMPLE_COUNT; i++) {
1859 if (sdhci_check_ro(host)) {
1860 if (++ro_count > SAMPLE_COUNT / 2)
1861 return 1;
1862 }
1863 msleep(30);
1864 }
1865 return 0;
1866}
1867
1868static void sdhci_hw_reset(struct mmc_host *mmc)
1869{
1870 struct sdhci_host *host = mmc_priv(mmc);
1871
1872 if (host->ops && host->ops->hw_reset)
1873 host->ops->hw_reset(host);
1874}
1875
1876static void sdhci_enable_sdio_irq_nolock(struct sdhci_host *host, int enable)
1877{
1878 if (!(host->flags & SDHCI_DEVICE_DEAD)) {
1879 if (enable)
1880 host->ier |= SDHCI_INT_CARD_INT;
1881 else
1882 host->ier &= ~SDHCI_INT_CARD_INT;
1883
1884 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
1885 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
1886 mmiowb();
1887 }
1888}
1889
1890void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable)
1891{
1892 struct sdhci_host *host = mmc_priv(mmc);
1893 unsigned long flags;
1894
1895 if (enable)
1896 pm_runtime_get_noresume(host->mmc->parent);
1897
1898 spin_lock_irqsave(&host->lock, flags);
1899 if (enable)
1900 host->flags |= SDHCI_SDIO_IRQ_ENABLED;
1901 else
1902 host->flags &= ~SDHCI_SDIO_IRQ_ENABLED;
1903
1904 sdhci_enable_sdio_irq_nolock(host, enable);
1905 spin_unlock_irqrestore(&host->lock, flags);
1906
1907 if (!enable)
1908 pm_runtime_put_noidle(host->mmc->parent);
1909}
1910EXPORT_SYMBOL_GPL(sdhci_enable_sdio_irq);
1911
1912int sdhci_start_signal_voltage_switch(struct mmc_host *mmc,
1913 struct mmc_ios *ios)
1914{
1915 struct sdhci_host *host = mmc_priv(mmc);
1916 u16 ctrl;
1917 int ret;
1918
1919 /*
1920 * Signal Voltage Switching is only applicable for Host Controllers
1921 * v3.00 and above.
1922 */
1923 if (host->version < SDHCI_SPEC_300)
1924 return 0;
1925
1926 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1927
1928 switch (ios->signal_voltage) {
1929 case MMC_SIGNAL_VOLTAGE_330:
1930 if (!(host->flags & SDHCI_SIGNALING_330))
1931 return -EINVAL;
1932 /* Set 1.8V Signal Enable in the Host Control2 register to 0 */
1933 ctrl &= ~SDHCI_CTRL_VDD_180;
1934 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1935
1936 if (!IS_ERR(mmc->supply.vqmmc)) {
1937 ret = mmc_regulator_set_vqmmc(mmc, ios);
1938 if (ret) {
1939 pr_warn("%s: Switching to 3.3V signalling voltage failed\n",
1940 mmc_hostname(mmc));
1941 return -EIO;
1942 }
1943 }
1944 /* Wait for 5ms */
1945 usleep_range(5000, 5500);
1946
1947 /* 3.3V regulator output should be stable within 5 ms */
1948 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1949 if (!(ctrl & SDHCI_CTRL_VDD_180))
1950 return 0;
1951
1952 pr_warn("%s: 3.3V regulator output did not became stable\n",
1953 mmc_hostname(mmc));
1954
1955 return -EAGAIN;
1956 case MMC_SIGNAL_VOLTAGE_180:
1957 if (!(host->flags & SDHCI_SIGNALING_180))
1958 return -EINVAL;
1959 if (!IS_ERR(mmc->supply.vqmmc)) {
1960 ret = mmc_regulator_set_vqmmc(mmc, ios);
1961 if (ret) {
1962 pr_warn("%s: Switching to 1.8V signalling voltage failed\n",
1963 mmc_hostname(mmc));
1964 return -EIO;
1965 }
1966 }
1967
1968 /*
1969 * Enable 1.8V Signal Enable in the Host Control2
1970 * register
1971 */
1972 ctrl |= SDHCI_CTRL_VDD_180;
1973 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1974
1975 /* Some controller need to do more when switching */
1976 if (host->ops->voltage_switch)
1977 host->ops->voltage_switch(host);
1978
1979 /* 1.8V regulator output should be stable within 5 ms */
1980 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1981 if (ctrl & SDHCI_CTRL_VDD_180)
1982 return 0;
1983
1984 pr_warn("%s: 1.8V regulator output did not became stable\n",
1985 mmc_hostname(mmc));
1986
1987 return -EAGAIN;
1988 case MMC_SIGNAL_VOLTAGE_120:
1989 if (!(host->flags & SDHCI_SIGNALING_120))
1990 return -EINVAL;
1991 if (!IS_ERR(mmc->supply.vqmmc)) {
1992 ret = mmc_regulator_set_vqmmc(mmc, ios);
1993 if (ret) {
1994 pr_warn("%s: Switching to 1.2V signalling voltage failed\n",
1995 mmc_hostname(mmc));
1996 return -EIO;
1997 }
1998 }
1999 return 0;
2000 default:
2001 /* No signal voltage switch required */
2002 return 0;
2003 }
2004}
2005EXPORT_SYMBOL_GPL(sdhci_start_signal_voltage_switch);
2006
2007static int sdhci_card_busy(struct mmc_host *mmc)
2008{
2009 struct sdhci_host *host = mmc_priv(mmc);
2010 u32 present_state;
2011
2012 /* Check whether DAT[0] is 0 */
2013 present_state = sdhci_readl(host, SDHCI_PRESENT_STATE);
2014
2015 return !(present_state & SDHCI_DATA_0_LVL_MASK);
2016}
2017
2018static int sdhci_prepare_hs400_tuning(struct mmc_host *mmc, struct mmc_ios *ios)
2019{
2020 struct sdhci_host *host = mmc_priv(mmc);
2021 unsigned long flags;
2022
2023 spin_lock_irqsave(&host->lock, flags);
2024 host->flags |= SDHCI_HS400_TUNING;
2025 spin_unlock_irqrestore(&host->lock, flags);
2026
2027 return 0;
2028}
2029
2030static void sdhci_start_tuning(struct sdhci_host *host)
2031{
2032 u16 ctrl;
2033
2034 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2035 ctrl |= SDHCI_CTRL_EXEC_TUNING;
2036 if (host->quirks2 & SDHCI_QUIRK2_TUNING_WORK_AROUND)
2037 ctrl |= SDHCI_CTRL_TUNED_CLK;
2038 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2039
2040 /*
2041 * As per the Host Controller spec v3.00, tuning command
2042 * generates Buffer Read Ready interrupt, so enable that.
2043 *
2044 * Note: The spec clearly says that when tuning sequence
2045 * is being performed, the controller does not generate
2046 * interrupts other than Buffer Read Ready interrupt. But
2047 * to make sure we don't hit a controller bug, we _only_
2048 * enable Buffer Read Ready interrupt here.
2049 */
2050 sdhci_writel(host, SDHCI_INT_DATA_AVAIL, SDHCI_INT_ENABLE);
2051 sdhci_writel(host, SDHCI_INT_DATA_AVAIL, SDHCI_SIGNAL_ENABLE);
2052}
2053
2054static void sdhci_end_tuning(struct sdhci_host *host)
2055{
2056 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
2057 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
2058}
2059
2060static void sdhci_reset_tuning(struct sdhci_host *host)
2061{
2062 u16 ctrl;
2063
2064 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2065 ctrl &= ~SDHCI_CTRL_TUNED_CLK;
2066 ctrl &= ~SDHCI_CTRL_EXEC_TUNING;
2067 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2068}
2069
2070static void sdhci_abort_tuning(struct sdhci_host *host, u32 opcode)
2071{
2072 sdhci_reset_tuning(host);
2073
2074 sdhci_do_reset(host, SDHCI_RESET_CMD);
2075 sdhci_do_reset(host, SDHCI_RESET_DATA);
2076
2077 sdhci_end_tuning(host);
2078
2079 mmc_abort_tuning(host->mmc, opcode);
2080}
2081
2082/*
2083 * We use sdhci_send_tuning() because mmc_send_tuning() is not a good fit. SDHCI
2084 * tuning command does not have a data payload (or rather the hardware does it
2085 * automatically) so mmc_send_tuning() will return -EIO. Also the tuning command
2086 * interrupt setup is different to other commands and there is no timeout
2087 * interrupt so special handling is needed.
2088 */
2089static void sdhci_send_tuning(struct sdhci_host *host, u32 opcode)
2090{
2091 struct mmc_host *mmc = host->mmc;
2092 struct mmc_command cmd = {};
2093 struct mmc_request mrq = {};
2094 unsigned long flags;
2095 u32 b = host->sdma_boundary;
2096
2097 spin_lock_irqsave(&host->lock, flags);
2098
2099 cmd.opcode = opcode;
2100 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
2101 cmd.mrq = &mrq;
2102
2103 mrq.cmd = &cmd;
2104 /*
2105 * In response to CMD19, the card sends 64 bytes of tuning
2106 * block to the Host Controller. So we set the block size
2107 * to 64 here.
2108 */
2109 if (cmd.opcode == MMC_SEND_TUNING_BLOCK_HS200 &&
2110 mmc->ios.bus_width == MMC_BUS_WIDTH_8)
2111 sdhci_writew(host, SDHCI_MAKE_BLKSZ(b, 128), SDHCI_BLOCK_SIZE);
2112 else
2113 sdhci_writew(host, SDHCI_MAKE_BLKSZ(b, 64), SDHCI_BLOCK_SIZE);
2114
2115 /*
2116 * The tuning block is sent by the card to the host controller.
2117 * So we set the TRNS_READ bit in the Transfer Mode register.
2118 * This also takes care of setting DMA Enable and Multi Block
2119 * Select in the same register to 0.
2120 */
2121 sdhci_writew(host, SDHCI_TRNS_READ, SDHCI_TRANSFER_MODE);
2122
2123 sdhci_send_command(host, &cmd);
2124
2125 host->cmd = NULL;
2126
2127 sdhci_del_timer(host, &mrq);
2128
2129 host->tuning_done = 0;
2130
2131 mmiowb();
2132 spin_unlock_irqrestore(&host->lock, flags);
2133
2134 /* Wait for Buffer Read Ready interrupt */
2135 wait_event_timeout(host->buf_ready_int, (host->tuning_done == 1),
2136 msecs_to_jiffies(50));
2137
2138}
2139
2140static void __sdhci_execute_tuning(struct sdhci_host *host, u32 opcode)
2141{
2142 int i;
2143
2144 /*
2145 * Issue opcode repeatedly till Execute Tuning is set to 0 or the number
2146 * of loops reaches 40 times.
2147 */
2148 for (i = 0; i < MAX_TUNING_LOOP; i++) {
2149 u16 ctrl;
2150
2151 sdhci_send_tuning(host, opcode);
2152
2153 if (!host->tuning_done) {
2154 pr_info("%s: Tuning timeout, falling back to fixed sampling clock\n",
2155 mmc_hostname(host->mmc));
2156 sdhci_abort_tuning(host, opcode);
2157 return;
2158 }
2159
2160 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2161 if (!(ctrl & SDHCI_CTRL_EXEC_TUNING)) {
2162 if (ctrl & SDHCI_CTRL_TUNED_CLK)
2163 return; /* Success! */
2164 break;
2165 }
2166
2167 /* Spec does not require a delay between tuning cycles */
2168 if (host->tuning_delay > 0)
2169 mdelay(host->tuning_delay);
2170 }
2171
2172 pr_info("%s: Tuning failed, falling back to fixed sampling clock\n",
2173 mmc_hostname(host->mmc));
2174 sdhci_reset_tuning(host);
2175}
2176
2177int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
2178{
2179 struct sdhci_host *host = mmc_priv(mmc);
2180 int err = 0;
2181 unsigned int tuning_count = 0;
2182 bool hs400_tuning;
2183
2184 hs400_tuning = host->flags & SDHCI_HS400_TUNING;
2185
2186 if (host->tuning_mode == SDHCI_TUNING_MODE_1)
2187 tuning_count = host->tuning_count;
2188
2189 /*
2190 * The Host Controller needs tuning in case of SDR104 and DDR50
2191 * mode, and for SDR50 mode when Use Tuning for SDR50 is set in
2192 * the Capabilities register.
2193 * If the Host Controller supports the HS200 mode then the
2194 * tuning function has to be executed.
2195 */
2196 switch (host->timing) {
2197 /* HS400 tuning is done in HS200 mode */
2198 case MMC_TIMING_MMC_HS400:
2199 err = -EINVAL;
2200 goto out;
2201
2202 case MMC_TIMING_MMC_HS200:
2203 /*
2204 * Periodic re-tuning for HS400 is not expected to be needed, so
2205 * disable it here.
2206 */
2207 if (hs400_tuning)
2208 tuning_count = 0;
2209 break;
2210
2211 case MMC_TIMING_UHS_SDR104:
2212 case MMC_TIMING_UHS_DDR50:
2213 break;
2214
2215 case MMC_TIMING_UHS_SDR50:
2216 if (host->flags & SDHCI_SDR50_NEEDS_TUNING)
2217 break;
2218 /* FALLTHROUGH */
2219
2220 default:
2221 goto out;
2222 }
2223
2224 if (host->ops->platform_execute_tuning) {
2225 err = host->ops->platform_execute_tuning(host, opcode);
2226 goto out;
2227 }
2228
2229 host->mmc->retune_period = tuning_count;
2230
2231 if (host->tuning_delay < 0)
2232 host->tuning_delay = opcode == MMC_SEND_TUNING_BLOCK;
2233
2234 sdhci_start_tuning(host);
2235
2236 __sdhci_execute_tuning(host, opcode);
2237
2238 sdhci_end_tuning(host);
2239out:
2240 host->flags &= ~SDHCI_HS400_TUNING;
2241
2242 return err;
2243}
2244EXPORT_SYMBOL_GPL(sdhci_execute_tuning);
2245
2246static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable)
2247{
2248 /* Host Controller v3.00 defines preset value registers */
2249 if (host->version < SDHCI_SPEC_300)
2250 return;
2251
2252 /*
2253 * We only enable or disable Preset Value if they are not already
2254 * enabled or disabled respectively. Otherwise, we bail out.
2255 */
2256 if (host->preset_enabled != enable) {
2257 u16 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2258
2259 if (enable)
2260 ctrl |= SDHCI_CTRL_PRESET_VAL_ENABLE;
2261 else
2262 ctrl &= ~SDHCI_CTRL_PRESET_VAL_ENABLE;
2263
2264 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2265
2266 if (enable)
2267 host->flags |= SDHCI_PV_ENABLED;
2268 else
2269 host->flags &= ~SDHCI_PV_ENABLED;
2270
2271 host->preset_enabled = enable;
2272 }
2273}
2274
2275static void sdhci_post_req(struct mmc_host *mmc, struct mmc_request *mrq,
2276 int err)
2277{
2278 struct sdhci_host *host = mmc_priv(mmc);
2279 struct mmc_data *data = mrq->data;
2280
2281 if (data->host_cookie != COOKIE_UNMAPPED)
2282 dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
2283 mmc_get_dma_dir(data));
2284
2285 data->host_cookie = COOKIE_UNMAPPED;
2286}
2287
2288static void sdhci_pre_req(struct mmc_host *mmc, struct mmc_request *mrq)
2289{
2290 struct sdhci_host *host = mmc_priv(mmc);
2291
2292 mrq->data->host_cookie = COOKIE_UNMAPPED;
2293
2294 /*
2295 * No pre-mapping in the pre hook if we're using the bounce buffer,
2296 * for that we would need two bounce buffers since one buffer is
2297 * in flight when this is getting called.
2298 */
2299 if (host->flags & SDHCI_REQ_USE_DMA && !host->bounce_buffer)
2300 sdhci_pre_dma_transfer(host, mrq->data, COOKIE_PRE_MAPPED);
2301}
2302
2303static inline bool sdhci_has_requests(struct sdhci_host *host)
2304{
2305 return host->cmd || host->data_cmd;
2306}
2307
2308static void sdhci_error_out_mrqs(struct sdhci_host *host, int err)
2309{
2310 if (host->data_cmd) {
2311 host->data_cmd->error = err;
2312 sdhci_finish_mrq(host, host->data_cmd->mrq);
2313 }
2314
2315 if (host->cmd) {
2316 host->cmd->error = err;
2317 sdhci_finish_mrq(host, host->cmd->mrq);
2318 }
2319}
2320
2321static void sdhci_card_event(struct mmc_host *mmc)
2322{
2323 struct sdhci_host *host = mmc_priv(mmc);
2324 unsigned long flags;
2325 int present;
2326
2327 /* First check if client has provided their own card event */
2328 if (host->ops->card_event)
2329 host->ops->card_event(host);
2330
2331 present = mmc->ops->get_cd(mmc);
2332
2333 spin_lock_irqsave(&host->lock, flags);
2334
2335 /* Check sdhci_has_requests() first in case we are runtime suspended */
2336 if (sdhci_has_requests(host) && !present) {
2337 pr_err("%s: Card removed during transfer!\n",
2338 mmc_hostname(host->mmc));
2339 pr_err("%s: Resetting controller.\n",
2340 mmc_hostname(host->mmc));
2341
2342 sdhci_do_reset(host, SDHCI_RESET_CMD);
2343 sdhci_do_reset(host, SDHCI_RESET_DATA);
2344
2345 sdhci_error_out_mrqs(host, -ENOMEDIUM);
2346 }
2347
2348 spin_unlock_irqrestore(&host->lock, flags);
2349}
2350
2351static const struct mmc_host_ops sdhci_ops = {
2352 .request = sdhci_request,
2353 .post_req = sdhci_post_req,
2354 .pre_req = sdhci_pre_req,
2355 .set_ios = sdhci_set_ios,
2356 .get_cd = sdhci_get_cd,
2357 .get_ro = sdhci_get_ro,
2358 .hw_reset = sdhci_hw_reset,
2359 .enable_sdio_irq = sdhci_enable_sdio_irq,
2360 .start_signal_voltage_switch = sdhci_start_signal_voltage_switch,
2361 .prepare_hs400_tuning = sdhci_prepare_hs400_tuning,
2362 .execute_tuning = sdhci_execute_tuning,
2363 .card_event = sdhci_card_event,
2364 .card_busy = sdhci_card_busy,
2365};
2366
2367/*****************************************************************************\
2368 * *
2369 * Tasklets *
2370 * *
2371\*****************************************************************************/
2372
2373static bool sdhci_request_done(struct sdhci_host *host)
2374{
2375 unsigned long flags;
2376 struct mmc_request *mrq;
2377 int i;
2378
2379 spin_lock_irqsave(&host->lock, flags);
2380
2381 for (i = 0; i < SDHCI_MAX_MRQS; i++) {
2382 mrq = host->mrqs_done[i];
2383 if (mrq)
2384 break;
2385 }
2386
2387 if (!mrq) {
2388 spin_unlock_irqrestore(&host->lock, flags);
2389 return true;
2390 }
2391
2392 sdhci_del_timer(host, mrq);
2393
2394 /*
2395 * Always unmap the data buffers if they were mapped by
2396 * sdhci_prepare_data() whenever we finish with a request.
2397 * This avoids leaking DMA mappings on error.
2398 */
2399 if (host->flags & SDHCI_REQ_USE_DMA) {
2400 struct mmc_data *data = mrq->data;
2401
2402 if (data && data->host_cookie == COOKIE_MAPPED) {
2403 if (host->bounce_buffer) {
2404 /*
2405 * On reads, copy the bounced data into the
2406 * sglist
2407 */
2408 if (mmc_get_dma_dir(data) == DMA_FROM_DEVICE) {
2409 unsigned int length = data->bytes_xfered;
2410
2411 if (length > host->bounce_buffer_size) {
2412 pr_err("%s: bounce buffer is %u bytes but DMA claims to have transferred %u bytes\n",
2413 mmc_hostname(host->mmc),
2414 host->bounce_buffer_size,
2415 data->bytes_xfered);
2416 /* Cap it down and continue */
2417 length = host->bounce_buffer_size;
2418 }
2419 dma_sync_single_for_cpu(
2420 host->mmc->parent,
2421 host->bounce_addr,
2422 host->bounce_buffer_size,
2423 DMA_FROM_DEVICE);
2424 sg_copy_from_buffer(data->sg,
2425 data->sg_len,
2426 host->bounce_buffer,
2427 length);
2428 } else {
2429 /* No copying, just switch ownership */
2430 dma_sync_single_for_cpu(
2431 host->mmc->parent,
2432 host->bounce_addr,
2433 host->bounce_buffer_size,
2434 mmc_get_dma_dir(data));
2435 }
2436 } else {
2437 /* Unmap the raw data */
2438 dma_unmap_sg(mmc_dev(host->mmc), data->sg,
2439 data->sg_len,
2440 mmc_get_dma_dir(data));
2441 }
2442 data->host_cookie = COOKIE_UNMAPPED;
2443 }
2444 }
2445
2446 /*
2447 * The controller needs a reset of internal state machines
2448 * upon error conditions.
2449 */
2450 if (sdhci_needs_reset(host, mrq)) {
2451 /*
2452 * Do not finish until command and data lines are available for
2453 * reset. Note there can only be one other mrq, so it cannot
2454 * also be in mrqs_done, otherwise host->cmd and host->data_cmd
2455 * would both be null.
2456 */
2457 if (host->cmd || host->data_cmd) {
2458 spin_unlock_irqrestore(&host->lock, flags);
2459 return true;
2460 }
2461
2462 /* Some controllers need this kick or reset won't work here */
2463 if (host->quirks & SDHCI_QUIRK_CLOCK_BEFORE_RESET)
2464 /* This is to force an update */
2465 host->ops->set_clock(host, host->clock);
2466
2467 /* Spec says we should do both at the same time, but Ricoh
2468 controllers do not like that. */
2469 sdhci_do_reset(host, SDHCI_RESET_CMD);
2470 sdhci_do_reset(host, SDHCI_RESET_DATA);
2471
2472 host->pending_reset = false;
2473 }
2474
2475 if (!sdhci_has_requests(host))
2476 sdhci_led_deactivate(host);
2477
2478 host->mrqs_done[i] = NULL;
2479
2480 mmiowb();
2481 spin_unlock_irqrestore(&host->lock, flags);
2482
2483 mmc_request_done(host->mmc, mrq);
2484
2485 return false;
2486}
2487
2488static void sdhci_tasklet_finish(unsigned long param)
2489{
2490 struct sdhci_host *host = (struct sdhci_host *)param;
2491
2492 while (!sdhci_request_done(host))
2493 ;
2494}
2495
2496static void sdhci_timeout_timer(struct timer_list *t)
2497{
2498 struct sdhci_host *host;
2499 unsigned long flags;
2500
2501 host = from_timer(host, t, timer);
2502
2503 spin_lock_irqsave(&host->lock, flags);
2504
2505 if (host->cmd && !sdhci_data_line_cmd(host->cmd)) {
2506 pr_err("%s: Timeout waiting for hardware cmd interrupt.\n",
2507 mmc_hostname(host->mmc));
2508 sdhci_dumpregs(host);
2509
2510 host->cmd->error = -ETIMEDOUT;
2511 sdhci_finish_mrq(host, host->cmd->mrq);
2512 }
2513
2514 mmiowb();
2515 spin_unlock_irqrestore(&host->lock, flags);
2516}
2517
2518static void sdhci_timeout_data_timer(struct timer_list *t)
2519{
2520 struct sdhci_host *host;
2521 unsigned long flags;
2522
2523 host = from_timer(host, t, data_timer);
2524
2525 spin_lock_irqsave(&host->lock, flags);
2526
2527 if (host->data || host->data_cmd ||
2528 (host->cmd && sdhci_data_line_cmd(host->cmd))) {
2529 pr_err("%s: Timeout waiting for hardware interrupt.\n",
2530 mmc_hostname(host->mmc));
2531 sdhci_dumpregs(host);
2532
2533 if (host->data) {
2534 host->data->error = -ETIMEDOUT;
2535 sdhci_finish_data(host);
2536 } else if (host->data_cmd) {
2537 host->data_cmd->error = -ETIMEDOUT;
2538 sdhci_finish_mrq(host, host->data_cmd->mrq);
2539 } else {
2540 host->cmd->error = -ETIMEDOUT;
2541 sdhci_finish_mrq(host, host->cmd->mrq);
2542 }
2543 }
2544
2545 mmiowb();
2546 spin_unlock_irqrestore(&host->lock, flags);
2547}
2548
2549/*****************************************************************************\
2550 * *
2551 * Interrupt handling *
2552 * *
2553\*****************************************************************************/
2554
2555static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask)
2556{
2557 if (!host->cmd) {
2558 /*
2559 * SDHCI recovers from errors by resetting the cmd and data
2560 * circuits. Until that is done, there very well might be more
2561 * interrupts, so ignore them in that case.
2562 */
2563 if (host->pending_reset)
2564 return;
2565 pr_err("%s: Got command interrupt 0x%08x even though no command operation was in progress.\n",
2566 mmc_hostname(host->mmc), (unsigned)intmask);
2567 sdhci_dumpregs(host);
2568 return;
2569 }
2570
2571 if (intmask & (SDHCI_INT_TIMEOUT | SDHCI_INT_CRC |
2572 SDHCI_INT_END_BIT | SDHCI_INT_INDEX)) {
2573 if (intmask & SDHCI_INT_TIMEOUT)
2574 host->cmd->error = -ETIMEDOUT;
2575 else
2576 host->cmd->error = -EILSEQ;
2577
2578 /*
2579 * If this command initiates a data phase and a response
2580 * CRC error is signalled, the card can start transferring
2581 * data - the card may have received the command without
2582 * error. We must not terminate the mmc_request early.
2583 *
2584 * If the card did not receive the command or returned an
2585 * error which prevented it sending data, the data phase
2586 * will time out.
2587 */
2588 if (host->cmd->data &&
2589 (intmask & (SDHCI_INT_CRC | SDHCI_INT_TIMEOUT)) ==
2590 SDHCI_INT_CRC) {
2591 host->cmd = NULL;
2592 return;
2593 }
2594
2595 sdhci_finish_mrq(host, host->cmd->mrq);
2596 return;
2597 }
2598
2599 if (intmask & SDHCI_INT_RESPONSE)
2600 sdhci_finish_command(host);
2601}
2602
2603static void sdhci_adma_show_error(struct sdhci_host *host)
2604{
2605 void *desc = host->adma_table;
2606
2607 sdhci_dumpregs(host);
2608
2609 while (true) {
2610 struct sdhci_adma2_64_desc *dma_desc = desc;
2611
2612 if (host->flags & SDHCI_USE_64_BIT_DMA)
2613 DBG("%p: DMA 0x%08x%08x, LEN 0x%04x, Attr=0x%02x\n",
2614 desc, le32_to_cpu(dma_desc->addr_hi),
2615 le32_to_cpu(dma_desc->addr_lo),
2616 le16_to_cpu(dma_desc->len),
2617 le16_to_cpu(dma_desc->cmd));
2618 else
2619 DBG("%p: DMA 0x%08x, LEN 0x%04x, Attr=0x%02x\n",
2620 desc, le32_to_cpu(dma_desc->addr_lo),
2621 le16_to_cpu(dma_desc->len),
2622 le16_to_cpu(dma_desc->cmd));
2623
2624 desc += host->desc_sz;
2625
2626 if (dma_desc->cmd & cpu_to_le16(ADMA2_END))
2627 break;
2628 }
2629}
2630
2631static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
2632{
2633 u32 command;
2634
2635 /* CMD19 generates _only_ Buffer Read Ready interrupt */
2636 if (intmask & SDHCI_INT_DATA_AVAIL) {
2637 command = SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND));
2638 if (command == MMC_SEND_TUNING_BLOCK ||
2639 command == MMC_SEND_TUNING_BLOCK_HS200) {
2640 host->tuning_done = 1;
2641 wake_up(&host->buf_ready_int);
2642 return;
2643 }
2644 }
2645
2646 if (!host->data) {
2647 struct mmc_command *data_cmd = host->data_cmd;
2648
2649 /*
2650 * The "data complete" interrupt is also used to
2651 * indicate that a busy state has ended. See comment
2652 * above in sdhci_cmd_irq().
2653 */
2654 if (data_cmd && (data_cmd->flags & MMC_RSP_BUSY)) {
2655 if (intmask & SDHCI_INT_DATA_TIMEOUT) {
2656 host->data_cmd = NULL;
2657 data_cmd->error = -ETIMEDOUT;
2658 sdhci_finish_mrq(host, data_cmd->mrq);
2659 return;
2660 }
2661 if (intmask & SDHCI_INT_DATA_END) {
2662 host->data_cmd = NULL;
2663 /*
2664 * Some cards handle busy-end interrupt
2665 * before the command completed, so make
2666 * sure we do things in the proper order.
2667 */
2668 if (host->cmd == data_cmd)
2669 return;
2670
2671 sdhci_finish_mrq(host, data_cmd->mrq);
2672 return;
2673 }
2674 }
2675
2676 /*
2677 * SDHCI recovers from errors by resetting the cmd and data
2678 * circuits. Until that is done, there very well might be more
2679 * interrupts, so ignore them in that case.
2680 */
2681 if (host->pending_reset)
2682 return;
2683
2684 pr_err("%s: Got data interrupt 0x%08x even though no data operation was in progress.\n",
2685 mmc_hostname(host->mmc), (unsigned)intmask);
2686 sdhci_dumpregs(host);
2687
2688 return;
2689 }
2690
2691 if (intmask & SDHCI_INT_DATA_TIMEOUT)
2692 host->data->error = -ETIMEDOUT;
2693 else if (intmask & SDHCI_INT_DATA_END_BIT)
2694 host->data->error = -EILSEQ;
2695 else if ((intmask & SDHCI_INT_DATA_CRC) &&
2696 SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND))
2697 != MMC_BUS_TEST_R)
2698 host->data->error = -EILSEQ;
2699 else if (intmask & SDHCI_INT_ADMA_ERROR) {
2700 pr_err("%s: ADMA error\n", mmc_hostname(host->mmc));
2701 sdhci_adma_show_error(host);
2702 host->data->error = -EIO;
2703 if (host->ops->adma_workaround)
2704 host->ops->adma_workaround(host, intmask);
2705 }
2706
2707 if (host->data->error)
2708 sdhci_finish_data(host);
2709 else {
2710 if (intmask & (SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL))
2711 sdhci_transfer_pio(host);
2712
2713 /*
2714 * We currently don't do anything fancy with DMA
2715 * boundaries, but as we can't disable the feature
2716 * we need to at least restart the transfer.
2717 *
2718 * According to the spec sdhci_readl(host, SDHCI_DMA_ADDRESS)
2719 * should return a valid address to continue from, but as
2720 * some controllers are faulty, don't trust them.
2721 */
2722 if (intmask & SDHCI_INT_DMA_END) {
2723 u32 dmastart, dmanow;
2724
2725 dmastart = sdhci_sdma_address(host);
2726 dmanow = dmastart + host->data->bytes_xfered;
2727 /*
2728 * Force update to the next DMA block boundary.
2729 */
2730 dmanow = (dmanow &
2731 ~(SDHCI_DEFAULT_BOUNDARY_SIZE - 1)) +
2732 SDHCI_DEFAULT_BOUNDARY_SIZE;
2733 host->data->bytes_xfered = dmanow - dmastart;
2734 DBG("DMA base 0x%08x, transferred 0x%06x bytes, next 0x%08x\n",
2735 dmastart, host->data->bytes_xfered, dmanow);
2736 sdhci_writel(host, dmanow, SDHCI_DMA_ADDRESS);
2737 }
2738
2739 if (intmask & SDHCI_INT_DATA_END) {
2740 if (host->cmd == host->data_cmd) {
2741 /*
2742 * Data managed to finish before the
2743 * command completed. Make sure we do
2744 * things in the proper order.
2745 */
2746 host->data_early = 1;
2747 } else {
2748 sdhci_finish_data(host);
2749 }
2750 }
2751 }
2752}
2753
2754static irqreturn_t sdhci_irq(int irq, void *dev_id)
2755{
2756 irqreturn_t result = IRQ_NONE;
2757 struct sdhci_host *host = dev_id;
2758 u32 intmask, mask, unexpected = 0;
2759 int max_loops = 16;
2760
2761 spin_lock(&host->lock);
2762
2763 if (host->runtime_suspended && !sdhci_sdio_irq_enabled(host)) {
2764 spin_unlock(&host->lock);
2765 return IRQ_NONE;
2766 }
2767
2768 intmask = sdhci_readl(host, SDHCI_INT_STATUS);
2769 if (!intmask || intmask == 0xffffffff) {
2770 result = IRQ_NONE;
2771 goto out;
2772 }
2773
2774 do {
2775 DBG("IRQ status 0x%08x\n", intmask);
2776
2777 if (host->ops->irq) {
2778 intmask = host->ops->irq(host, intmask);
2779 if (!intmask)
2780 goto cont;
2781 }
2782
2783 /* Clear selected interrupts. */
2784 mask = intmask & (SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK |
2785 SDHCI_INT_BUS_POWER);
2786 sdhci_writel(host, mask, SDHCI_INT_STATUS);
2787
2788 if (intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
2789 u32 present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
2790 SDHCI_CARD_PRESENT;
2791
2792 /*
2793 * There is a observation on i.mx esdhc. INSERT
2794 * bit will be immediately set again when it gets
2795 * cleared, if a card is inserted. We have to mask
2796 * the irq to prevent interrupt storm which will
2797 * freeze the system. And the REMOVE gets the
2798 * same situation.
2799 *
2800 * More testing are needed here to ensure it works
2801 * for other platforms though.
2802 */
2803 host->ier &= ~(SDHCI_INT_CARD_INSERT |
2804 SDHCI_INT_CARD_REMOVE);
2805 host->ier |= present ? SDHCI_INT_CARD_REMOVE :
2806 SDHCI_INT_CARD_INSERT;
2807 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
2808 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
2809
2810 sdhci_writel(host, intmask & (SDHCI_INT_CARD_INSERT |
2811 SDHCI_INT_CARD_REMOVE), SDHCI_INT_STATUS);
2812
2813 host->thread_isr |= intmask & (SDHCI_INT_CARD_INSERT |
2814 SDHCI_INT_CARD_REMOVE);
2815 result = IRQ_WAKE_THREAD;
2816 }
2817
2818 if (intmask & SDHCI_INT_CMD_MASK)
2819 sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK);
2820
2821 if (intmask & SDHCI_INT_DATA_MASK)
2822 sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK);
2823
2824 if (intmask & SDHCI_INT_BUS_POWER)
2825 pr_err("%s: Card is consuming too much power!\n",
2826 mmc_hostname(host->mmc));
2827
2828 if (intmask & SDHCI_INT_RETUNE)
2829 mmc_retune_needed(host->mmc);
2830
2831 if ((intmask & SDHCI_INT_CARD_INT) &&
2832 (host->ier & SDHCI_INT_CARD_INT)) {
2833 sdhci_enable_sdio_irq_nolock(host, false);
2834 host->thread_isr |= SDHCI_INT_CARD_INT;
2835 result = IRQ_WAKE_THREAD;
2836 }
2837
2838 intmask &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE |
2839 SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK |
2840 SDHCI_INT_ERROR | SDHCI_INT_BUS_POWER |
2841 SDHCI_INT_RETUNE | SDHCI_INT_CARD_INT);
2842
2843 if (intmask) {
2844 unexpected |= intmask;
2845 sdhci_writel(host, intmask, SDHCI_INT_STATUS);
2846 }
2847cont:
2848 if (result == IRQ_NONE)
2849 result = IRQ_HANDLED;
2850
2851 intmask = sdhci_readl(host, SDHCI_INT_STATUS);
2852 } while (intmask && --max_loops);
2853out:
2854 spin_unlock(&host->lock);
2855
2856 if (unexpected) {
2857 pr_err("%s: Unexpected interrupt 0x%08x.\n",
2858 mmc_hostname(host->mmc), unexpected);
2859 sdhci_dumpregs(host);
2860 }
2861
2862 return result;
2863}
2864
2865static irqreturn_t sdhci_thread_irq(int irq, void *dev_id)
2866{
2867 struct sdhci_host *host = dev_id;
2868 unsigned long flags;
2869 u32 isr;
2870
2871 spin_lock_irqsave(&host->lock, flags);
2872 isr = host->thread_isr;
2873 host->thread_isr = 0;
2874 spin_unlock_irqrestore(&host->lock, flags);
2875
2876 if (isr & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
2877 struct mmc_host *mmc = host->mmc;
2878
2879 mmc->ops->card_event(mmc);
2880 mmc_detect_change(mmc, msecs_to_jiffies(200));
2881 }
2882
2883 if (isr & SDHCI_INT_CARD_INT) {
2884 sdio_run_irqs(host->mmc);
2885
2886 spin_lock_irqsave(&host->lock, flags);
2887 if (host->flags & SDHCI_SDIO_IRQ_ENABLED)
2888 sdhci_enable_sdio_irq_nolock(host, true);
2889 spin_unlock_irqrestore(&host->lock, flags);
2890 }
2891
2892 return isr ? IRQ_HANDLED : IRQ_NONE;
2893}
2894
2895/*****************************************************************************\
2896 * *
2897 * Suspend/resume *
2898 * *
2899\*****************************************************************************/
2900
2901#ifdef CONFIG_PM
2902
2903static bool sdhci_cd_irq_can_wakeup(struct sdhci_host *host)
2904{
2905 return mmc_card_is_removable(host->mmc) &&
2906 !(host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) &&
2907 !mmc_can_gpio_cd(host->mmc);
2908}
2909
2910/*
2911 * To enable wakeup events, the corresponding events have to be enabled in
2912 * the Interrupt Status Enable register too. See 'Table 1-6: Wakeup Signal
2913 * Table' in the SD Host Controller Standard Specification.
2914 * It is useless to restore SDHCI_INT_ENABLE state in
2915 * sdhci_disable_irq_wakeups() since it will be set by
2916 * sdhci_enable_card_detection() or sdhci_init().
2917 */
2918static bool sdhci_enable_irq_wakeups(struct sdhci_host *host)
2919{
2920 u8 mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE |
2921 SDHCI_WAKE_ON_INT;
2922 u32 irq_val = 0;
2923 u8 wake_val = 0;
2924 u8 val;
2925
2926 if (sdhci_cd_irq_can_wakeup(host)) {
2927 wake_val |= SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE;
2928 irq_val |= SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE;
2929 }
2930
2931 if (mmc_card_wake_sdio_irq(host->mmc)) {
2932 wake_val |= SDHCI_WAKE_ON_INT;
2933 irq_val |= SDHCI_INT_CARD_INT;
2934 }
2935
2936 if (!irq_val)
2937 return false;
2938
2939 val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
2940 val &= ~mask;
2941 val |= wake_val;
2942 sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
2943
2944 sdhci_writel(host, irq_val, SDHCI_INT_ENABLE);
2945
2946 host->irq_wake_enabled = !enable_irq_wake(host->irq);
2947
2948 return host->irq_wake_enabled;
2949}
2950
2951static void sdhci_disable_irq_wakeups(struct sdhci_host *host)
2952{
2953 u8 val;
2954 u8 mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE
2955 | SDHCI_WAKE_ON_INT;
2956
2957 val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
2958 val &= ~mask;
2959 sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
2960
2961 disable_irq_wake(host->irq);
2962
2963 host->irq_wake_enabled = false;
2964}
2965
2966int sdhci_suspend_host(struct sdhci_host *host)
2967{
2968 sdhci_disable_card_detection(host);
2969
2970 mmc_retune_timer_stop(host->mmc);
2971
2972 if (!device_may_wakeup(mmc_dev(host->mmc)) ||
2973 !sdhci_enable_irq_wakeups(host)) {
2974 host->ier = 0;
2975 sdhci_writel(host, 0, SDHCI_INT_ENABLE);
2976 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
2977 free_irq(host->irq, host);
2978 }
2979
2980 return 0;
2981}
2982
2983EXPORT_SYMBOL_GPL(sdhci_suspend_host);
2984
2985int sdhci_resume_host(struct sdhci_host *host)
2986{
2987 struct mmc_host *mmc = host->mmc;
2988 int ret = 0;
2989
2990 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
2991 if (host->ops->enable_dma)
2992 host->ops->enable_dma(host);
2993 }
2994
2995 if ((host->mmc->pm_flags & MMC_PM_KEEP_POWER) &&
2996 (host->quirks2 & SDHCI_QUIRK2_HOST_OFF_CARD_ON)) {
2997 /* Card keeps power but host controller does not */
2998 sdhci_init(host, 0);
2999 host->pwr = 0;
3000 host->clock = 0;
3001 mmc->ops->set_ios(mmc, &mmc->ios);
3002 } else {
3003 sdhci_init(host, (host->mmc->pm_flags & MMC_PM_KEEP_POWER));
3004 mmiowb();
3005 }
3006
3007 if (host->irq_wake_enabled) {
3008 sdhci_disable_irq_wakeups(host);
3009 } else {
3010 ret = request_threaded_irq(host->irq, sdhci_irq,
3011 sdhci_thread_irq, IRQF_SHARED,
3012 mmc_hostname(host->mmc), host);
3013 if (ret)
3014 return ret;
3015 }
3016
3017 sdhci_enable_card_detection(host);
3018
3019 return ret;
3020}
3021
3022EXPORT_SYMBOL_GPL(sdhci_resume_host);
3023
3024int sdhci_runtime_suspend_host(struct sdhci_host *host)
3025{
3026 unsigned long flags;
3027
3028 mmc_retune_timer_stop(host->mmc);
3029
3030 spin_lock_irqsave(&host->lock, flags);
3031 host->ier &= SDHCI_INT_CARD_INT;
3032 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
3033 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
3034 spin_unlock_irqrestore(&host->lock, flags);
3035
3036 synchronize_hardirq(host->irq);
3037
3038 spin_lock_irqsave(&host->lock, flags);
3039 host->runtime_suspended = true;
3040 spin_unlock_irqrestore(&host->lock, flags);
3041
3042 return 0;
3043}
3044EXPORT_SYMBOL_GPL(sdhci_runtime_suspend_host);
3045
3046int sdhci_runtime_resume_host(struct sdhci_host *host)
3047{
3048 struct mmc_host *mmc = host->mmc;
3049 unsigned long flags;
3050 int host_flags = host->flags;
3051
3052 if (host_flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
3053 if (host->ops->enable_dma)
3054 host->ops->enable_dma(host);
3055 }
3056
3057 sdhci_init(host, 0);
3058
3059 if (mmc->ios.power_mode != MMC_POWER_UNDEFINED &&
3060 mmc->ios.power_mode != MMC_POWER_OFF) {
3061 /* Force clock and power re-program */
3062 host->pwr = 0;
3063 host->clock = 0;
3064 mmc->ops->start_signal_voltage_switch(mmc, &mmc->ios);
3065 mmc->ops->set_ios(mmc, &mmc->ios);
3066
3067 if ((host_flags & SDHCI_PV_ENABLED) &&
3068 !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN)) {
3069 spin_lock_irqsave(&host->lock, flags);
3070 sdhci_enable_preset_value(host, true);
3071 spin_unlock_irqrestore(&host->lock, flags);
3072 }
3073
3074 if ((mmc->caps2 & MMC_CAP2_HS400_ES) &&
3075 mmc->ops->hs400_enhanced_strobe)
3076 mmc->ops->hs400_enhanced_strobe(mmc, &mmc->ios);
3077 }
3078
3079 spin_lock_irqsave(&host->lock, flags);
3080
3081 host->runtime_suspended = false;
3082
3083 /* Enable SDIO IRQ */
3084 if (host->flags & SDHCI_SDIO_IRQ_ENABLED)
3085 sdhci_enable_sdio_irq_nolock(host, true);
3086
3087 /* Enable Card Detection */
3088 sdhci_enable_card_detection(host);
3089
3090 spin_unlock_irqrestore(&host->lock, flags);
3091
3092 return 0;
3093}
3094EXPORT_SYMBOL_GPL(sdhci_runtime_resume_host);
3095
3096#endif /* CONFIG_PM */
3097
3098/*****************************************************************************\
3099 * *
3100 * Command Queue Engine (CQE) helpers *
3101 * *
3102\*****************************************************************************/
3103
3104void sdhci_cqe_enable(struct mmc_host *mmc)
3105{
3106 struct sdhci_host *host = mmc_priv(mmc);
3107 unsigned long flags;
3108 u8 ctrl;
3109
3110 spin_lock_irqsave(&host->lock, flags);
3111
3112 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
3113 ctrl &= ~SDHCI_CTRL_DMA_MASK;
3114 if (host->flags & SDHCI_USE_64_BIT_DMA)
3115 ctrl |= SDHCI_CTRL_ADMA64;
3116 else
3117 ctrl |= SDHCI_CTRL_ADMA32;
3118 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
3119
3120 sdhci_writew(host, SDHCI_MAKE_BLKSZ(host->sdma_boundary, 512),
3121 SDHCI_BLOCK_SIZE);
3122
3123 /* Set maximum timeout */
3124 sdhci_writeb(host, 0xE, SDHCI_TIMEOUT_CONTROL);
3125
3126 host->ier = host->cqe_ier;
3127
3128 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
3129 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
3130
3131 host->cqe_on = true;
3132
3133 pr_debug("%s: sdhci: CQE on, IRQ mask %#x, IRQ status %#x\n",
3134 mmc_hostname(mmc), host->ier,
3135 sdhci_readl(host, SDHCI_INT_STATUS));
3136
3137 mmiowb();
3138 spin_unlock_irqrestore(&host->lock, flags);
3139}
3140EXPORT_SYMBOL_GPL(sdhci_cqe_enable);
3141
3142void sdhci_cqe_disable(struct mmc_host *mmc, bool recovery)
3143{
3144 struct sdhci_host *host = mmc_priv(mmc);
3145 unsigned long flags;
3146
3147 spin_lock_irqsave(&host->lock, flags);
3148
3149 sdhci_set_default_irqs(host);
3150
3151 host->cqe_on = false;
3152
3153 if (recovery) {
3154 sdhci_do_reset(host, SDHCI_RESET_CMD);
3155 sdhci_do_reset(host, SDHCI_RESET_DATA);
3156 }
3157
3158 pr_debug("%s: sdhci: CQE off, IRQ mask %#x, IRQ status %#x\n",
3159 mmc_hostname(mmc), host->ier,
3160 sdhci_readl(host, SDHCI_INT_STATUS));
3161
3162 mmiowb();
3163 spin_unlock_irqrestore(&host->lock, flags);
3164}
3165EXPORT_SYMBOL_GPL(sdhci_cqe_disable);
3166
3167bool sdhci_cqe_irq(struct sdhci_host *host, u32 intmask, int *cmd_error,
3168 int *data_error)
3169{
3170 u32 mask;
3171
3172 if (!host->cqe_on)
3173 return false;
3174
3175 if (intmask & (SDHCI_INT_INDEX | SDHCI_INT_END_BIT | SDHCI_INT_CRC))
3176 *cmd_error = -EILSEQ;
3177 else if (intmask & SDHCI_INT_TIMEOUT)
3178 *cmd_error = -ETIMEDOUT;
3179 else
3180 *cmd_error = 0;
3181
3182 if (intmask & (SDHCI_INT_DATA_END_BIT | SDHCI_INT_DATA_CRC))
3183 *data_error = -EILSEQ;
3184 else if (intmask & SDHCI_INT_DATA_TIMEOUT)
3185 *data_error = -ETIMEDOUT;
3186 else if (intmask & SDHCI_INT_ADMA_ERROR)
3187 *data_error = -EIO;
3188 else
3189 *data_error = 0;
3190
3191 /* Clear selected interrupts. */
3192 mask = intmask & host->cqe_ier;
3193 sdhci_writel(host, mask, SDHCI_INT_STATUS);
3194
3195 if (intmask & SDHCI_INT_BUS_POWER)
3196 pr_err("%s: Card is consuming too much power!\n",
3197 mmc_hostname(host->mmc));
3198
3199 intmask &= ~(host->cqe_ier | SDHCI_INT_ERROR);
3200 if (intmask) {
3201 sdhci_writel(host, intmask, SDHCI_INT_STATUS);
3202 pr_err("%s: CQE: Unexpected interrupt 0x%08x.\n",
3203 mmc_hostname(host->mmc), intmask);
3204 sdhci_dumpregs(host);
3205 }
3206
3207 return true;
3208}
3209EXPORT_SYMBOL_GPL(sdhci_cqe_irq);
3210
3211/*****************************************************************************\
3212 * *
3213 * Device allocation/registration *
3214 * *
3215\*****************************************************************************/
3216
3217struct sdhci_host *sdhci_alloc_host(struct device *dev,
3218 size_t priv_size)
3219{
3220 struct mmc_host *mmc;
3221 struct sdhci_host *host;
3222
3223 WARN_ON(dev == NULL);
3224
3225 mmc = mmc_alloc_host(sizeof(struct sdhci_host) + priv_size, dev);
3226 if (!mmc)
3227 return ERR_PTR(-ENOMEM);
3228
3229 host = mmc_priv(mmc);
3230 host->mmc = mmc;
3231 host->mmc_host_ops = sdhci_ops;
3232 mmc->ops = &host->mmc_host_ops;
3233
3234 host->flags = SDHCI_SIGNALING_330;
3235
3236 host->cqe_ier = SDHCI_CQE_INT_MASK;
3237 host->cqe_err_ier = SDHCI_CQE_INT_ERR_MASK;
3238
3239 host->tuning_delay = -1;
3240
3241 host->sdma_boundary = SDHCI_DEFAULT_BOUNDARY_ARG;
3242
3243 return host;
3244}
3245
3246EXPORT_SYMBOL_GPL(sdhci_alloc_host);
3247
3248static int sdhci_set_dma_mask(struct sdhci_host *host)
3249{
3250 struct mmc_host *mmc = host->mmc;
3251 struct device *dev = mmc_dev(mmc);
3252 int ret = -EINVAL;
3253
3254 if (host->quirks2 & SDHCI_QUIRK2_BROKEN_64_BIT_DMA)
3255 host->flags &= ~SDHCI_USE_64_BIT_DMA;
3256
3257 /* Try 64-bit mask if hardware is capable of it */
3258 if (host->flags & SDHCI_USE_64_BIT_DMA) {
3259 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
3260 if (ret) {
3261 pr_warn("%s: Failed to set 64-bit DMA mask.\n",
3262 mmc_hostname(mmc));
3263 host->flags &= ~SDHCI_USE_64_BIT_DMA;
3264 }
3265 }
3266
3267 /* 32-bit mask as default & fallback */
3268 if (ret) {
3269 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
3270 if (ret)
3271 pr_warn("%s: Failed to set 32-bit DMA mask.\n",
3272 mmc_hostname(mmc));
3273 }
3274
3275 return ret;
3276}
3277
3278void __sdhci_read_caps(struct sdhci_host *host, u16 *ver, u32 *caps, u32 *caps1)
3279{
3280 u16 v;
3281 u64 dt_caps_mask = 0;
3282 u64 dt_caps = 0;
3283
3284 if (host->read_caps)
3285 return;
3286
3287 host->read_caps = true;
3288
3289 if (debug_quirks)
3290 host->quirks = debug_quirks;
3291
3292 if (debug_quirks2)
3293 host->quirks2 = debug_quirks2;
3294
3295 sdhci_do_reset(host, SDHCI_RESET_ALL);
3296
3297 of_property_read_u64(mmc_dev(host->mmc)->of_node,
3298 "sdhci-caps-mask", &dt_caps_mask);
3299 of_property_read_u64(mmc_dev(host->mmc)->of_node,
3300 "sdhci-caps", &dt_caps);
3301
3302 v = ver ? *ver : sdhci_readw(host, SDHCI_HOST_VERSION);
3303 host->version = (v & SDHCI_SPEC_VER_MASK) >> SDHCI_SPEC_VER_SHIFT;
3304
3305 if (host->quirks & SDHCI_QUIRK_MISSING_CAPS)
3306 return;
3307
3308 if (caps) {
3309 host->caps = *caps;
3310 } else {
3311 host->caps = sdhci_readl(host, SDHCI_CAPABILITIES);
3312 host->caps &= ~lower_32_bits(dt_caps_mask);
3313 host->caps |= lower_32_bits(dt_caps);
3314 }
3315
3316 if (host->version < SDHCI_SPEC_300)
3317 return;
3318
3319 if (caps1) {
3320 host->caps1 = *caps1;
3321 } else {
3322 host->caps1 = sdhci_readl(host, SDHCI_CAPABILITIES_1);
3323 host->caps1 &= ~upper_32_bits(dt_caps_mask);
3324 host->caps1 |= upper_32_bits(dt_caps);
3325 }
3326}
3327EXPORT_SYMBOL_GPL(__sdhci_read_caps);
3328
3329static int sdhci_allocate_bounce_buffer(struct sdhci_host *host)
3330{
3331 struct mmc_host *mmc = host->mmc;
3332 unsigned int max_blocks;
3333 unsigned int bounce_size;
3334 int ret;
3335
3336 /*
3337 * Cap the bounce buffer at 64KB. Using a bigger bounce buffer
3338 * has diminishing returns, this is probably because SD/MMC
3339 * cards are usually optimized to handle this size of requests.
3340 */
3341 bounce_size = SZ_64K;
3342 /*
3343 * Adjust downwards to maximum request size if this is less
3344 * than our segment size, else hammer down the maximum
3345 * request size to the maximum buffer size.
3346 */
3347 if (mmc->max_req_size < bounce_size)
3348 bounce_size = mmc->max_req_size;
3349 max_blocks = bounce_size / 512;
3350
3351 /*
3352 * When we just support one segment, we can get significant
3353 * speedups by the help of a bounce buffer to group scattered
3354 * reads/writes together.
3355 */
3356 host->bounce_buffer = devm_kmalloc(mmc->parent,
3357 bounce_size,
3358 GFP_KERNEL);
3359 if (!host->bounce_buffer) {
3360 pr_err("%s: failed to allocate %u bytes for bounce buffer, falling back to single segments\n",
3361 mmc_hostname(mmc),
3362 bounce_size);
3363 /*
3364 * Exiting with zero here makes sure we proceed with
3365 * mmc->max_segs == 1.
3366 */
3367 return 0;
3368 }
3369
3370 host->bounce_addr = dma_map_single(mmc->parent,
3371 host->bounce_buffer,
3372 bounce_size,
3373 DMA_BIDIRECTIONAL);
3374 ret = dma_mapping_error(mmc->parent, host->bounce_addr);
3375 if (ret)
3376 /* Again fall back to max_segs == 1 */
3377 return 0;
3378 host->bounce_buffer_size = bounce_size;
3379
3380 /* Lie about this since we're bouncing */
3381 mmc->max_segs = max_blocks;
3382 mmc->max_seg_size = bounce_size;
3383 mmc->max_req_size = bounce_size;
3384
3385 pr_info("%s bounce up to %u segments into one, max segment size %u bytes\n",
3386 mmc_hostname(mmc), max_blocks, bounce_size);
3387
3388 return 0;
3389}
3390
3391int sdhci_setup_host(struct sdhci_host *host)
3392{
3393 struct mmc_host *mmc;
3394 u32 max_current_caps;
3395 unsigned int ocr_avail;
3396 unsigned int override_timeout_clk;
3397 u32 max_clk;
3398 int ret;
3399
3400 WARN_ON(host == NULL);
3401 if (host == NULL)
3402 return -EINVAL;
3403
3404 mmc = host->mmc;
3405
3406 /*
3407 * If there are external regulators, get them. Note this must be done
3408 * early before resetting the host and reading the capabilities so that
3409 * the host can take the appropriate action if regulators are not
3410 * available.
3411 */
3412 ret = mmc_regulator_get_supply(mmc);
3413 if (ret)
3414 return ret;
3415
3416 DBG("Version: 0x%08x | Present: 0x%08x\n",
3417 sdhci_readw(host, SDHCI_HOST_VERSION),
3418 sdhci_readl(host, SDHCI_PRESENT_STATE));
3419 DBG("Caps: 0x%08x | Caps_1: 0x%08x\n",
3420 sdhci_readl(host, SDHCI_CAPABILITIES),
3421 sdhci_readl(host, SDHCI_CAPABILITIES_1));
3422
3423 sdhci_read_caps(host);
3424
3425 override_timeout_clk = host->timeout_clk;
3426
3427 if (host->version > SDHCI_SPEC_300) {
3428 pr_err("%s: Unknown controller version (%d). You may experience problems.\n",
3429 mmc_hostname(mmc), host->version);
3430 }
3431
3432 if (host->quirks & SDHCI_QUIRK_FORCE_DMA)
3433 host->flags |= SDHCI_USE_SDMA;
3434 else if (!(host->caps & SDHCI_CAN_DO_SDMA))
3435 DBG("Controller doesn't have SDMA capability\n");
3436 else
3437 host->flags |= SDHCI_USE_SDMA;
3438
3439 if ((host->quirks & SDHCI_QUIRK_BROKEN_DMA) &&
3440 (host->flags & SDHCI_USE_SDMA)) {
3441 DBG("Disabling DMA as it is marked broken\n");
3442 host->flags &= ~SDHCI_USE_SDMA;
3443 }
3444
3445 if ((host->version >= SDHCI_SPEC_200) &&
3446 (host->caps & SDHCI_CAN_DO_ADMA2))
3447 host->flags |= SDHCI_USE_ADMA;
3448
3449 if ((host->quirks & SDHCI_QUIRK_BROKEN_ADMA) &&
3450 (host->flags & SDHCI_USE_ADMA)) {
3451 DBG("Disabling ADMA as it is marked broken\n");
3452 host->flags &= ~SDHCI_USE_ADMA;
3453 }
3454
3455 /*
3456 * It is assumed that a 64-bit capable device has set a 64-bit DMA mask
3457 * and *must* do 64-bit DMA. A driver has the opportunity to change
3458 * that during the first call to ->enable_dma(). Similarly
3459 * SDHCI_QUIRK2_BROKEN_64_BIT_DMA must be left to the drivers to
3460 * implement.
3461 */
3462 if (host->caps & SDHCI_CAN_64BIT)
3463 host->flags |= SDHCI_USE_64_BIT_DMA;
3464
3465 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
3466 ret = sdhci_set_dma_mask(host);
3467
3468 if (!ret && host->ops->enable_dma)
3469 ret = host->ops->enable_dma(host);
3470
3471 if (ret) {
3472 pr_warn("%s: No suitable DMA available - falling back to PIO\n",
3473 mmc_hostname(mmc));
3474 host->flags &= ~(SDHCI_USE_SDMA | SDHCI_USE_ADMA);
3475
3476 ret = 0;
3477 }
3478 }
3479
3480 /* SDMA does not support 64-bit DMA */
3481 if (host->flags & SDHCI_USE_64_BIT_DMA)
3482 host->flags &= ~SDHCI_USE_SDMA;
3483
3484 if (host->flags & SDHCI_USE_ADMA) {
3485 dma_addr_t dma;
3486 void *buf;
3487
3488 /*
3489 * The DMA descriptor table size is calculated as the maximum
3490 * number of segments times 2, to allow for an alignment
3491 * descriptor for each segment, plus 1 for a nop end descriptor,
3492 * all multipled by the descriptor size.
3493 */
3494 if (host->flags & SDHCI_USE_64_BIT_DMA) {
3495 host->adma_table_sz = (SDHCI_MAX_SEGS * 2 + 1) *
3496 SDHCI_ADMA2_64_DESC_SZ;
3497 host->desc_sz = SDHCI_ADMA2_64_DESC_SZ;
3498 } else {
3499 host->adma_table_sz = (SDHCI_MAX_SEGS * 2 + 1) *
3500 SDHCI_ADMA2_32_DESC_SZ;
3501 host->desc_sz = SDHCI_ADMA2_32_DESC_SZ;
3502 }
3503
3504 host->align_buffer_sz = SDHCI_MAX_SEGS * SDHCI_ADMA2_ALIGN;
3505 buf = dma_alloc_coherent(mmc_dev(mmc), host->align_buffer_sz +
3506 host->adma_table_sz, &dma, GFP_KERNEL);
3507 if (!buf) {
3508 pr_warn("%s: Unable to allocate ADMA buffers - falling back to standard DMA\n",
3509 mmc_hostname(mmc));
3510 host->flags &= ~SDHCI_USE_ADMA;
3511 } else if ((dma + host->align_buffer_sz) &
3512 (SDHCI_ADMA2_DESC_ALIGN - 1)) {
3513 pr_warn("%s: unable to allocate aligned ADMA descriptor\n",
3514 mmc_hostname(mmc));
3515 host->flags &= ~SDHCI_USE_ADMA;
3516 dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz +
3517 host->adma_table_sz, buf, dma);
3518 } else {
3519 host->align_buffer = buf;
3520 host->align_addr = dma;
3521
3522 host->adma_table = buf + host->align_buffer_sz;
3523 host->adma_addr = dma + host->align_buffer_sz;
3524 }
3525 }
3526
3527 /*
3528 * If we use DMA, then it's up to the caller to set the DMA
3529 * mask, but PIO does not need the hw shim so we set a new
3530 * mask here in that case.
3531 */
3532 if (!(host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA))) {
3533 host->dma_mask = DMA_BIT_MASK(64);
3534 mmc_dev(mmc)->dma_mask = &host->dma_mask;
3535 }
3536
3537 if (host->version >= SDHCI_SPEC_300)
3538 host->max_clk = (host->caps & SDHCI_CLOCK_V3_BASE_MASK)
3539 >> SDHCI_CLOCK_BASE_SHIFT;
3540 else
3541 host->max_clk = (host->caps & SDHCI_CLOCK_BASE_MASK)
3542 >> SDHCI_CLOCK_BASE_SHIFT;
3543
3544 host->max_clk *= 1000000;
3545 if (host->max_clk == 0 || host->quirks &
3546 SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN) {
3547 if (!host->ops->get_max_clock) {
3548 pr_err("%s: Hardware doesn't specify base clock frequency.\n",
3549 mmc_hostname(mmc));
3550 ret = -ENODEV;
3551 goto undma;
3552 }
3553 host->max_clk = host->ops->get_max_clock(host);
3554 }
3555
3556 /*
3557 * In case of Host Controller v3.00, find out whether clock
3558 * multiplier is supported.
3559 */
3560 host->clk_mul = (host->caps1 & SDHCI_CLOCK_MUL_MASK) >>
3561 SDHCI_CLOCK_MUL_SHIFT;
3562
3563 /*
3564 * In case the value in Clock Multiplier is 0, then programmable
3565 * clock mode is not supported, otherwise the actual clock
3566 * multiplier is one more than the value of Clock Multiplier
3567 * in the Capabilities Register.
3568 */
3569 if (host->clk_mul)
3570 host->clk_mul += 1;
3571
3572 /*
3573 * Set host parameters.
3574 */
3575 max_clk = host->max_clk;
3576
3577 if (host->ops->get_min_clock)
3578 mmc->f_min = host->ops->get_min_clock(host);
3579 else if (host->version >= SDHCI_SPEC_300) {
3580 if (host->clk_mul) {
3581 mmc->f_min = (host->max_clk * host->clk_mul) / 1024;
3582 max_clk = host->max_clk * host->clk_mul;
3583 } else
3584 mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_300;
3585 } else
3586 mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_200;
3587
3588 if (!mmc->f_max || mmc->f_max > max_clk)
3589 mmc->f_max = max_clk;
3590
3591 if (!(host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK)) {
3592 host->timeout_clk = (host->caps & SDHCI_TIMEOUT_CLK_MASK) >>
3593 SDHCI_TIMEOUT_CLK_SHIFT;
3594
3595 if (host->caps & SDHCI_TIMEOUT_CLK_UNIT)
3596 host->timeout_clk *= 1000;
3597
3598 if (host->timeout_clk == 0) {
3599 if (!host->ops->get_timeout_clock) {
3600 pr_err("%s: Hardware doesn't specify timeout clock frequency.\n",
3601 mmc_hostname(mmc));
3602 ret = -ENODEV;
3603 goto undma;
3604 }
3605
3606 host->timeout_clk =
3607 DIV_ROUND_UP(host->ops->get_timeout_clock(host),
3608 1000);
3609 }
3610
3611 if (override_timeout_clk)
3612 host->timeout_clk = override_timeout_clk;
3613
3614 mmc->max_busy_timeout = host->ops->get_max_timeout_count ?
3615 host->ops->get_max_timeout_count(host) : 1 << 27;
3616 mmc->max_busy_timeout /= host->timeout_clk;
3617 }
3618
3619 mmc->caps |= MMC_CAP_SDIO_IRQ | MMC_CAP_ERASE | MMC_CAP_CMD23;
3620 mmc->caps2 |= MMC_CAP2_SDIO_IRQ_NOTHREAD;
3621
3622 if (host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12)
3623 host->flags |= SDHCI_AUTO_CMD12;
3624
3625 /* Auto-CMD23 stuff only works in ADMA or PIO. */
3626 if ((host->version >= SDHCI_SPEC_300) &&
3627 ((host->flags & SDHCI_USE_ADMA) ||
3628 !(host->flags & SDHCI_USE_SDMA)) &&
3629 !(host->quirks2 & SDHCI_QUIRK2_ACMD23_BROKEN)) {
3630 host->flags |= SDHCI_AUTO_CMD23;
3631 DBG("Auto-CMD23 available\n");
3632 } else {
3633 DBG("Auto-CMD23 unavailable\n");
3634 }
3635
3636 /*
3637 * A controller may support 8-bit width, but the board itself
3638 * might not have the pins brought out. Boards that support
3639 * 8-bit width must set "mmc->caps |= MMC_CAP_8_BIT_DATA;" in
3640 * their platform code before calling sdhci_add_host(), and we
3641 * won't assume 8-bit width for hosts without that CAP.
3642 */
3643 if (!(host->quirks & SDHCI_QUIRK_FORCE_1_BIT_DATA))
3644 mmc->caps |= MMC_CAP_4_BIT_DATA;
3645
3646 if (host->quirks2 & SDHCI_QUIRK2_HOST_NO_CMD23)
3647 mmc->caps &= ~MMC_CAP_CMD23;
3648
3649 if (host->caps & SDHCI_CAN_DO_HISPD)
3650 mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
3651
3652 if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) &&
3653 mmc_card_is_removable(mmc) &&
3654 mmc_gpio_get_cd(host->mmc) < 0)
3655 mmc->caps |= MMC_CAP_NEEDS_POLL;
3656
3657 /* If vqmmc regulator and no 1.8V signalling, then there's no UHS */
3658 if (!IS_ERR(mmc->supply.vqmmc)) {
3659 ret = regulator_enable(mmc->supply.vqmmc);
3660 if (!regulator_is_supported_voltage(mmc->supply.vqmmc, 1700000,
3661 1950000))
3662 host->caps1 &= ~(SDHCI_SUPPORT_SDR104 |
3663 SDHCI_SUPPORT_SDR50 |
3664 SDHCI_SUPPORT_DDR50);
3665 if (ret) {
3666 pr_warn("%s: Failed to enable vqmmc regulator: %d\n",
3667 mmc_hostname(mmc), ret);
3668 mmc->supply.vqmmc = ERR_PTR(-EINVAL);
3669 }
3670 }
3671
3672 if (host->quirks2 & SDHCI_QUIRK2_NO_1_8_V) {
3673 host->caps1 &= ~(SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 |
3674 SDHCI_SUPPORT_DDR50);
3675 }
3676
3677 /* Any UHS-I mode in caps implies SDR12 and SDR25 support. */
3678 if (host->caps1 & (SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 |
3679 SDHCI_SUPPORT_DDR50))
3680 mmc->caps |= MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25;
3681
3682 /* SDR104 supports also implies SDR50 support */
3683 if (host->caps1 & SDHCI_SUPPORT_SDR104) {
3684 mmc->caps |= MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_SDR50;
3685 /* SD3.0: SDR104 is supported so (for eMMC) the caps2
3686 * field can be promoted to support HS200.
3687 */
3688 if (!(host->quirks2 & SDHCI_QUIRK2_BROKEN_HS200))
3689 mmc->caps2 |= MMC_CAP2_HS200;
3690 } else if (host->caps1 & SDHCI_SUPPORT_SDR50) {
3691 mmc->caps |= MMC_CAP_UHS_SDR50;
3692 }
3693
3694 if (host->quirks2 & SDHCI_QUIRK2_CAPS_BIT63_FOR_HS400 &&
3695 (host->caps1 & SDHCI_SUPPORT_HS400))
3696 mmc->caps2 |= MMC_CAP2_HS400;
3697
3698 if ((mmc->caps2 & MMC_CAP2_HSX00_1_2V) &&
3699 (IS_ERR(mmc->supply.vqmmc) ||
3700 !regulator_is_supported_voltage(mmc->supply.vqmmc, 1100000,
3701 1300000)))
3702 mmc->caps2 &= ~MMC_CAP2_HSX00_1_2V;
3703
3704 if ((host->caps1 & SDHCI_SUPPORT_DDR50) &&
3705 !(host->quirks2 & SDHCI_QUIRK2_BROKEN_DDR50))
3706 mmc->caps |= MMC_CAP_UHS_DDR50;
3707
3708 /* Does the host need tuning for SDR50? */
3709 if (host->caps1 & SDHCI_USE_SDR50_TUNING)
3710 host->flags |= SDHCI_SDR50_NEEDS_TUNING;
3711
3712 /* Driver Type(s) (A, C, D) supported by the host */
3713 if (host->caps1 & SDHCI_DRIVER_TYPE_A)
3714 mmc->caps |= MMC_CAP_DRIVER_TYPE_A;
3715 if (host->caps1 & SDHCI_DRIVER_TYPE_C)
3716 mmc->caps |= MMC_CAP_DRIVER_TYPE_C;
3717 if (host->caps1 & SDHCI_DRIVER_TYPE_D)
3718 mmc->caps |= MMC_CAP_DRIVER_TYPE_D;
3719
3720 /* Initial value for re-tuning timer count */
3721 host->tuning_count = (host->caps1 & SDHCI_RETUNING_TIMER_COUNT_MASK) >>
3722 SDHCI_RETUNING_TIMER_COUNT_SHIFT;
3723
3724 /*
3725 * In case Re-tuning Timer is not disabled, the actual value of
3726 * re-tuning timer will be 2 ^ (n - 1).
3727 */
3728 if (host->tuning_count)
3729 host->tuning_count = 1 << (host->tuning_count - 1);
3730
3731 /* Re-tuning mode supported by the Host Controller */
3732 host->tuning_mode = (host->caps1 & SDHCI_RETUNING_MODE_MASK) >>
3733 SDHCI_RETUNING_MODE_SHIFT;
3734
3735 ocr_avail = 0;
3736
3737 /*
3738 * According to SD Host Controller spec v3.00, if the Host System
3739 * can afford more than 150mA, Host Driver should set XPC to 1. Also
3740 * the value is meaningful only if Voltage Support in the Capabilities
3741 * register is set. The actual current value is 4 times the register
3742 * value.
3743 */
3744 max_current_caps = sdhci_readl(host, SDHCI_MAX_CURRENT);
3745 if (!max_current_caps && !IS_ERR(mmc->supply.vmmc)) {
3746 int curr = regulator_get_current_limit(mmc->supply.vmmc);
3747 if (curr > 0) {
3748
3749 /* convert to SDHCI_MAX_CURRENT format */
3750 curr = curr/1000; /* convert to mA */
3751 curr = curr/SDHCI_MAX_CURRENT_MULTIPLIER;
3752
3753 curr = min_t(u32, curr, SDHCI_MAX_CURRENT_LIMIT);
3754 max_current_caps =
3755 (curr << SDHCI_MAX_CURRENT_330_SHIFT) |
3756 (curr << SDHCI_MAX_CURRENT_300_SHIFT) |
3757 (curr << SDHCI_MAX_CURRENT_180_SHIFT);
3758 }
3759 }
3760
3761 if (host->caps & SDHCI_CAN_VDD_330) {
3762 ocr_avail |= MMC_VDD_32_33 | MMC_VDD_33_34;
3763
3764 mmc->max_current_330 = ((max_current_caps &
3765 SDHCI_MAX_CURRENT_330_MASK) >>
3766 SDHCI_MAX_CURRENT_330_SHIFT) *
3767 SDHCI_MAX_CURRENT_MULTIPLIER;
3768 }
3769 if (host->caps & SDHCI_CAN_VDD_300) {
3770 ocr_avail |= MMC_VDD_29_30 | MMC_VDD_30_31;
3771
3772 mmc->max_current_300 = ((max_current_caps &
3773 SDHCI_MAX_CURRENT_300_MASK) >>
3774 SDHCI_MAX_CURRENT_300_SHIFT) *
3775 SDHCI_MAX_CURRENT_MULTIPLIER;
3776 }
3777 if (host->caps & SDHCI_CAN_VDD_180) {
3778 ocr_avail |= MMC_VDD_165_195;
3779
3780 mmc->max_current_180 = ((max_current_caps &
3781 SDHCI_MAX_CURRENT_180_MASK) >>
3782 SDHCI_MAX_CURRENT_180_SHIFT) *
3783 SDHCI_MAX_CURRENT_MULTIPLIER;
3784 }
3785
3786 /* If OCR set by host, use it instead. */
3787 if (host->ocr_mask)
3788 ocr_avail = host->ocr_mask;
3789
3790 /* If OCR set by external regulators, give it highest prio. */
3791 if (mmc->ocr_avail)
3792 ocr_avail = mmc->ocr_avail;
3793
3794 mmc->ocr_avail = ocr_avail;
3795 mmc->ocr_avail_sdio = ocr_avail;
3796 if (host->ocr_avail_sdio)
3797 mmc->ocr_avail_sdio &= host->ocr_avail_sdio;
3798 mmc->ocr_avail_sd = ocr_avail;
3799 if (host->ocr_avail_sd)
3800 mmc->ocr_avail_sd &= host->ocr_avail_sd;
3801 else /* normal SD controllers don't support 1.8V */
3802 mmc->ocr_avail_sd &= ~MMC_VDD_165_195;
3803 mmc->ocr_avail_mmc = ocr_avail;
3804 if (host->ocr_avail_mmc)
3805 mmc->ocr_avail_mmc &= host->ocr_avail_mmc;
3806
3807 if (mmc->ocr_avail == 0) {
3808 pr_err("%s: Hardware doesn't report any support voltages.\n",
3809 mmc_hostname(mmc));
3810 ret = -ENODEV;
3811 goto unreg;
3812 }
3813
3814 if ((mmc->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
3815 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 |
3816 MMC_CAP_UHS_DDR50 | MMC_CAP_1_8V_DDR)) ||
3817 (mmc->caps2 & (MMC_CAP2_HS200_1_8V_SDR | MMC_CAP2_HS400_1_8V)))
3818 host->flags |= SDHCI_SIGNALING_180;
3819
3820 if (mmc->caps2 & MMC_CAP2_HSX00_1_2V)
3821 host->flags |= SDHCI_SIGNALING_120;
3822
3823 spin_lock_init(&host->lock);
3824
3825 /*
3826 * Maximum number of sectors in one transfer. Limited by SDMA boundary
3827 * size (512KiB). Note some tuning modes impose a 4MiB limit, but this
3828 * is less anyway.
3829 */
3830 mmc->max_req_size = 524288;
3831
3832 /*
3833 * Maximum number of segments. Depends on if the hardware
3834 * can do scatter/gather or not.
3835 */
3836 if (host->flags & SDHCI_USE_ADMA) {
3837 mmc->max_segs = SDHCI_MAX_SEGS;
3838 } else if (host->flags & SDHCI_USE_SDMA) {
3839 mmc->max_segs = 1;
3840 if (swiotlb_max_segment()) {
3841 unsigned int max_req_size = (1 << IO_TLB_SHIFT) *
3842 IO_TLB_SEGSIZE;
3843 mmc->max_req_size = min(mmc->max_req_size,
3844 max_req_size);
3845 }
3846 } else { /* PIO */
3847 mmc->max_segs = SDHCI_MAX_SEGS;
3848 }
3849
3850 /*
3851 * Maximum segment size. Could be one segment with the maximum number
3852 * of bytes. When doing hardware scatter/gather, each entry cannot
3853 * be larger than 64 KiB though.
3854 */
3855 if (host->flags & SDHCI_USE_ADMA) {
3856 if (host->quirks & SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC)
3857 mmc->max_seg_size = 65535;
3858 else
3859 mmc->max_seg_size = 65536;
3860 } else {
3861 mmc->max_seg_size = mmc->max_req_size;
3862 }
3863
3864 /*
3865 * Maximum block size. This varies from controller to controller and
3866 * is specified in the capabilities register.
3867 */
3868 if (host->quirks & SDHCI_QUIRK_FORCE_BLK_SZ_2048) {
3869 mmc->max_blk_size = 2;
3870 } else {
3871 mmc->max_blk_size = (host->caps & SDHCI_MAX_BLOCK_MASK) >>
3872 SDHCI_MAX_BLOCK_SHIFT;
3873 if (mmc->max_blk_size >= 3) {
3874 pr_warn("%s: Invalid maximum block size, assuming 512 bytes\n",
3875 mmc_hostname(mmc));
3876 mmc->max_blk_size = 0;
3877 }
3878 }
3879
3880 mmc->max_blk_size = 512 << mmc->max_blk_size;
3881
3882 /*
3883 * Maximum block count.
3884 */
3885 mmc->max_blk_count = (host->quirks & SDHCI_QUIRK_NO_MULTIBLOCK) ? 1 : 65535;
3886
3887 if (mmc->max_segs == 1) {
3888 /* This may alter mmc->*_blk_* parameters */
3889 ret = sdhci_allocate_bounce_buffer(host);
3890 if (ret)
3891 return ret;
3892 }
3893
3894 return 0;
3895
3896unreg:
3897 if (!IS_ERR(mmc->supply.vqmmc))
3898 regulator_disable(mmc->supply.vqmmc);
3899undma:
3900 if (host->align_buffer)
3901 dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz +
3902 host->adma_table_sz, host->align_buffer,
3903 host->align_addr);
3904 host->adma_table = NULL;
3905 host->align_buffer = NULL;
3906
3907 return ret;
3908}
3909EXPORT_SYMBOL_GPL(sdhci_setup_host);
3910
3911void sdhci_cleanup_host(struct sdhci_host *host)
3912{
3913 struct mmc_host *mmc = host->mmc;
3914
3915 if (!IS_ERR(mmc->supply.vqmmc))
3916 regulator_disable(mmc->supply.vqmmc);
3917
3918 if (host->align_buffer)
3919 dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz +
3920 host->adma_table_sz, host->align_buffer,
3921 host->align_addr);
3922 host->adma_table = NULL;
3923 host->align_buffer = NULL;
3924}
3925EXPORT_SYMBOL_GPL(sdhci_cleanup_host);
3926
3927int __sdhci_add_host(struct sdhci_host *host)
3928{
3929 struct mmc_host *mmc = host->mmc;
3930 int ret;
3931
3932 /*
3933 * Init tasklets.
3934 */
3935 tasklet_init(&host->finish_tasklet,
3936 sdhci_tasklet_finish, (unsigned long)host);
3937
3938 timer_setup(&host->timer, sdhci_timeout_timer, 0);
3939 timer_setup(&host->data_timer, sdhci_timeout_data_timer, 0);
3940
3941 init_waitqueue_head(&host->buf_ready_int);
3942
3943 sdhci_init(host, 0);
3944
3945 ret = request_threaded_irq(host->irq, sdhci_irq, sdhci_thread_irq,
3946 IRQF_SHARED, mmc_hostname(mmc), host);
3947 if (ret) {
3948 pr_err("%s: Failed to request IRQ %d: %d\n",
3949 mmc_hostname(mmc), host->irq, ret);
3950 goto untasklet;
3951 }
3952
3953 ret = sdhci_led_register(host);
3954 if (ret) {
3955 pr_err("%s: Failed to register LED device: %d\n",
3956 mmc_hostname(mmc), ret);
3957 goto unirq;
3958 }
3959
3960 mmiowb();
3961
3962 ret = mmc_add_host(mmc);
3963 if (ret)
3964 goto unled;
3965
3966 pr_info("%s: SDHCI controller on %s [%s] using %s\n",
3967 mmc_hostname(mmc), host->hw_name, dev_name(mmc_dev(mmc)),
3968 (host->flags & SDHCI_USE_ADMA) ?
3969 (host->flags & SDHCI_USE_64_BIT_DMA) ? "ADMA 64-bit" : "ADMA" :
3970 (host->flags & SDHCI_USE_SDMA) ? "DMA" : "PIO");
3971
3972 sdhci_enable_card_detection(host);
3973
3974 return 0;
3975
3976unled:
3977 sdhci_led_unregister(host);
3978unirq:
3979 sdhci_do_reset(host, SDHCI_RESET_ALL);
3980 sdhci_writel(host, 0, SDHCI_INT_ENABLE);
3981 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
3982 free_irq(host->irq, host);
3983untasklet:
3984 tasklet_kill(&host->finish_tasklet);
3985
3986 return ret;
3987}
3988EXPORT_SYMBOL_GPL(__sdhci_add_host);
3989
3990int sdhci_add_host(struct sdhci_host *host)
3991{
3992 int ret;
3993
3994 ret = sdhci_setup_host(host);
3995 if (ret)
3996 return ret;
3997
3998 ret = __sdhci_add_host(host);
3999 if (ret)
4000 goto cleanup;
4001
4002 return 0;
4003
4004cleanup:
4005 sdhci_cleanup_host(host);
4006
4007 return ret;
4008}
4009EXPORT_SYMBOL_GPL(sdhci_add_host);
4010
4011void sdhci_remove_host(struct sdhci_host *host, int dead)
4012{
4013 struct mmc_host *mmc = host->mmc;
4014 unsigned long flags;
4015
4016 if (dead) {
4017 spin_lock_irqsave(&host->lock, flags);
4018
4019 host->flags |= SDHCI_DEVICE_DEAD;
4020
4021 if (sdhci_has_requests(host)) {
4022 pr_err("%s: Controller removed during "
4023 " transfer!\n", mmc_hostname(mmc));
4024 sdhci_error_out_mrqs(host, -ENOMEDIUM);
4025 }
4026
4027 spin_unlock_irqrestore(&host->lock, flags);
4028 }
4029
4030 sdhci_disable_card_detection(host);
4031
4032 mmc_remove_host(mmc);
4033
4034 sdhci_led_unregister(host);
4035
4036 if (!dead)
4037 sdhci_do_reset(host, SDHCI_RESET_ALL);
4038
4039 sdhci_writel(host, 0, SDHCI_INT_ENABLE);
4040 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
4041 free_irq(host->irq, host);
4042
4043 del_timer_sync(&host->timer);
4044 del_timer_sync(&host->data_timer);
4045
4046 tasklet_kill(&host->finish_tasklet);
4047
4048 if (!IS_ERR(mmc->supply.vqmmc))
4049 regulator_disable(mmc->supply.vqmmc);
4050
4051 if (host->align_buffer)
4052 dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz +
4053 host->adma_table_sz, host->align_buffer,
4054 host->align_addr);
4055
4056 host->adma_table = NULL;
4057 host->align_buffer = NULL;
4058}
4059
4060EXPORT_SYMBOL_GPL(sdhci_remove_host);
4061
4062void sdhci_free_host(struct sdhci_host *host)
4063{
4064 mmc_free_host(host->mmc);
4065}
4066
4067EXPORT_SYMBOL_GPL(sdhci_free_host);
4068
4069/*****************************************************************************\
4070 * *
4071 * Driver init/exit *
4072 * *
4073\*****************************************************************************/
4074
4075static int __init sdhci_drv_init(void)
4076{
4077 pr_info(DRIVER_NAME
4078 ": Secure Digital Host Controller Interface driver\n");
4079 pr_info(DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
4080
4081 return 0;
4082}
4083
4084static void __exit sdhci_drv_exit(void)
4085{
4086}
4087
4088module_init(sdhci_drv_init);
4089module_exit(sdhci_drv_exit);
4090
4091module_param(debug_quirks, uint, 0444);
4092module_param(debug_quirks2, uint, 0444);
4093
4094MODULE_AUTHOR("Pierre Ossman <pierre@ossman.eu>");
4095MODULE_DESCRIPTION("Secure Digital Host Controller Interface core driver");
4096MODULE_LICENSE("GPL");
4097
4098MODULE_PARM_DESC(debug_quirks, "Force certain quirks.");
4099MODULE_PARM_DESC(debug_quirks2, "Force certain other quirks.");