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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/highmem.h>
18#include <linux/io.h>
19#include <linux/dma-mapping.h>
20#include <linux/slab.h>
21#include <linux/scatterlist.h>
22#include <linux/regulator/consumer.h>
23
24#include <linux/leds.h>
25
26#include <linux/mmc/mmc.h>
27#include <linux/mmc/host.h>
28
29#include "sdhci.h"
30
31#define DRIVER_NAME "sdhci"
32
33#define DBG(f, x...) \
34 pr_debug(DRIVER_NAME " [%s()]: " f, __func__,## x)
35
36#if defined(CONFIG_LEDS_CLASS) || (defined(CONFIG_LEDS_CLASS_MODULE) && \
37 defined(CONFIG_MMC_SDHCI_MODULE))
38#define SDHCI_USE_LEDS_CLASS
39#endif
40
41#define MAX_TUNING_LOOP 40
42
43static unsigned int debug_quirks = 0;
44
45static void sdhci_finish_data(struct sdhci_host *);
46
47static void sdhci_send_command(struct sdhci_host *, struct mmc_command *);
48static void sdhci_finish_command(struct sdhci_host *);
49static int sdhci_execute_tuning(struct mmc_host *mmc);
50static void sdhci_tuning_timer(unsigned long data);
51
52static void sdhci_dumpregs(struct sdhci_host *host)
53{
54 printk(KERN_DEBUG DRIVER_NAME ": =========== REGISTER DUMP (%s)===========\n",
55 mmc_hostname(host->mmc));
56
57 printk(KERN_DEBUG DRIVER_NAME ": Sys addr: 0x%08x | Version: 0x%08x\n",
58 sdhci_readl(host, SDHCI_DMA_ADDRESS),
59 sdhci_readw(host, SDHCI_HOST_VERSION));
60 printk(KERN_DEBUG DRIVER_NAME ": Blk size: 0x%08x | Blk cnt: 0x%08x\n",
61 sdhci_readw(host, SDHCI_BLOCK_SIZE),
62 sdhci_readw(host, SDHCI_BLOCK_COUNT));
63 printk(KERN_DEBUG DRIVER_NAME ": Argument: 0x%08x | Trn mode: 0x%08x\n",
64 sdhci_readl(host, SDHCI_ARGUMENT),
65 sdhci_readw(host, SDHCI_TRANSFER_MODE));
66 printk(KERN_DEBUG DRIVER_NAME ": Present: 0x%08x | Host ctl: 0x%08x\n",
67 sdhci_readl(host, SDHCI_PRESENT_STATE),
68 sdhci_readb(host, SDHCI_HOST_CONTROL));
69 printk(KERN_DEBUG DRIVER_NAME ": Power: 0x%08x | Blk gap: 0x%08x\n",
70 sdhci_readb(host, SDHCI_POWER_CONTROL),
71 sdhci_readb(host, SDHCI_BLOCK_GAP_CONTROL));
72 printk(KERN_DEBUG DRIVER_NAME ": Wake-up: 0x%08x | Clock: 0x%08x\n",
73 sdhci_readb(host, SDHCI_WAKE_UP_CONTROL),
74 sdhci_readw(host, SDHCI_CLOCK_CONTROL));
75 printk(KERN_DEBUG DRIVER_NAME ": Timeout: 0x%08x | Int stat: 0x%08x\n",
76 sdhci_readb(host, SDHCI_TIMEOUT_CONTROL),
77 sdhci_readl(host, SDHCI_INT_STATUS));
78 printk(KERN_DEBUG DRIVER_NAME ": Int enab: 0x%08x | Sig enab: 0x%08x\n",
79 sdhci_readl(host, SDHCI_INT_ENABLE),
80 sdhci_readl(host, SDHCI_SIGNAL_ENABLE));
81 printk(KERN_DEBUG DRIVER_NAME ": AC12 err: 0x%08x | Slot int: 0x%08x\n",
82 sdhci_readw(host, SDHCI_ACMD12_ERR),
83 sdhci_readw(host, SDHCI_SLOT_INT_STATUS));
84 printk(KERN_DEBUG DRIVER_NAME ": Caps: 0x%08x | Caps_1: 0x%08x\n",
85 sdhci_readl(host, SDHCI_CAPABILITIES),
86 sdhci_readl(host, SDHCI_CAPABILITIES_1));
87 printk(KERN_DEBUG DRIVER_NAME ": Cmd: 0x%08x | Max curr: 0x%08x\n",
88 sdhci_readw(host, SDHCI_COMMAND),
89 sdhci_readl(host, SDHCI_MAX_CURRENT));
90 printk(KERN_DEBUG DRIVER_NAME ": Host ctl2: 0x%08x\n",
91 sdhci_readw(host, SDHCI_HOST_CONTROL2));
92
93 if (host->flags & SDHCI_USE_ADMA)
94 printk(KERN_DEBUG DRIVER_NAME ": ADMA Err: 0x%08x | ADMA Ptr: 0x%08x\n",
95 readl(host->ioaddr + SDHCI_ADMA_ERROR),
96 readl(host->ioaddr + SDHCI_ADMA_ADDRESS));
97
98 printk(KERN_DEBUG DRIVER_NAME ": ===========================================\n");
99}
100
101/*****************************************************************************\
102 * *
103 * Low level functions *
104 * *
105\*****************************************************************************/
106
107static void sdhci_clear_set_irqs(struct sdhci_host *host, u32 clear, u32 set)
108{
109 u32 ier;
110
111 ier = sdhci_readl(host, SDHCI_INT_ENABLE);
112 ier &= ~clear;
113 ier |= set;
114 sdhci_writel(host, ier, SDHCI_INT_ENABLE);
115 sdhci_writel(host, ier, SDHCI_SIGNAL_ENABLE);
116}
117
118static void sdhci_unmask_irqs(struct sdhci_host *host, u32 irqs)
119{
120 sdhci_clear_set_irqs(host, 0, irqs);
121}
122
123static void sdhci_mask_irqs(struct sdhci_host *host, u32 irqs)
124{
125 sdhci_clear_set_irqs(host, irqs, 0);
126}
127
128static void sdhci_set_card_detection(struct sdhci_host *host, bool enable)
129{
130 u32 present, irqs;
131
132 if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
133 return;
134
135 present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
136 SDHCI_CARD_PRESENT;
137 irqs = present ? SDHCI_INT_CARD_REMOVE : SDHCI_INT_CARD_INSERT;
138
139 if (enable)
140 sdhci_unmask_irqs(host, irqs);
141 else
142 sdhci_mask_irqs(host, irqs);
143}
144
145static void sdhci_enable_card_detection(struct sdhci_host *host)
146{
147 sdhci_set_card_detection(host, true);
148}
149
150static void sdhci_disable_card_detection(struct sdhci_host *host)
151{
152 sdhci_set_card_detection(host, false);
153}
154
155static void sdhci_reset(struct sdhci_host *host, u8 mask)
156{
157 unsigned long timeout;
158 u32 uninitialized_var(ier);
159
160 if (host->quirks & SDHCI_QUIRK_NO_CARD_NO_RESET) {
161 if (!(sdhci_readl(host, SDHCI_PRESENT_STATE) &
162 SDHCI_CARD_PRESENT))
163 return;
164 }
165
166 if (host->quirks & SDHCI_QUIRK_RESTORE_IRQS_AFTER_RESET)
167 ier = sdhci_readl(host, SDHCI_INT_ENABLE);
168
169 if (host->ops->platform_reset_enter)
170 host->ops->platform_reset_enter(host, mask);
171
172 sdhci_writeb(host, mask, SDHCI_SOFTWARE_RESET);
173
174 if (mask & SDHCI_RESET_ALL)
175 host->clock = 0;
176
177 /* Wait max 100 ms */
178 timeout = 100;
179
180 /* hw clears the bit when it's done */
181 while (sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask) {
182 if (timeout == 0) {
183 printk(KERN_ERR "%s: Reset 0x%x never completed.\n",
184 mmc_hostname(host->mmc), (int)mask);
185 sdhci_dumpregs(host);
186 return;
187 }
188 timeout--;
189 mdelay(1);
190 }
191
192 if (host->ops->platform_reset_exit)
193 host->ops->platform_reset_exit(host, mask);
194
195 if (host->quirks & SDHCI_QUIRK_RESTORE_IRQS_AFTER_RESET)
196 sdhci_clear_set_irqs(host, SDHCI_INT_ALL_MASK, ier);
197}
198
199static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios);
200
201static void sdhci_init(struct sdhci_host *host, int soft)
202{
203 if (soft)
204 sdhci_reset(host, SDHCI_RESET_CMD|SDHCI_RESET_DATA);
205 else
206 sdhci_reset(host, SDHCI_RESET_ALL);
207
208 sdhci_clear_set_irqs(host, SDHCI_INT_ALL_MASK,
209 SDHCI_INT_BUS_POWER | SDHCI_INT_DATA_END_BIT |
210 SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_TIMEOUT | SDHCI_INT_INDEX |
211 SDHCI_INT_END_BIT | SDHCI_INT_CRC | SDHCI_INT_TIMEOUT |
212 SDHCI_INT_DATA_END | SDHCI_INT_RESPONSE);
213
214 if (soft) {
215 /* force clock reconfiguration */
216 host->clock = 0;
217 sdhci_set_ios(host->mmc, &host->mmc->ios);
218 }
219}
220
221static void sdhci_reinit(struct sdhci_host *host)
222{
223 sdhci_init(host, 0);
224 sdhci_enable_card_detection(host);
225}
226
227static void sdhci_activate_led(struct sdhci_host *host)
228{
229 u8 ctrl;
230
231 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
232 ctrl |= SDHCI_CTRL_LED;
233 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
234}
235
236static void sdhci_deactivate_led(struct sdhci_host *host)
237{
238 u8 ctrl;
239
240 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
241 ctrl &= ~SDHCI_CTRL_LED;
242 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
243}
244
245#ifdef SDHCI_USE_LEDS_CLASS
246static void sdhci_led_control(struct led_classdev *led,
247 enum led_brightness brightness)
248{
249 struct sdhci_host *host = container_of(led, struct sdhci_host, led);
250 unsigned long flags;
251
252 spin_lock_irqsave(&host->lock, flags);
253
254 if (brightness == LED_OFF)
255 sdhci_deactivate_led(host);
256 else
257 sdhci_activate_led(host);
258
259 spin_unlock_irqrestore(&host->lock, flags);
260}
261#endif
262
263/*****************************************************************************\
264 * *
265 * Core functions *
266 * *
267\*****************************************************************************/
268
269static void sdhci_read_block_pio(struct sdhci_host *host)
270{
271 unsigned long flags;
272 size_t blksize, len, chunk;
273 u32 uninitialized_var(scratch);
274 u8 *buf;
275
276 DBG("PIO reading\n");
277
278 blksize = host->data->blksz;
279 chunk = 0;
280
281 local_irq_save(flags);
282
283 while (blksize) {
284 if (!sg_miter_next(&host->sg_miter))
285 BUG();
286
287 len = min(host->sg_miter.length, blksize);
288
289 blksize -= len;
290 host->sg_miter.consumed = len;
291
292 buf = host->sg_miter.addr;
293
294 while (len) {
295 if (chunk == 0) {
296 scratch = sdhci_readl(host, SDHCI_BUFFER);
297 chunk = 4;
298 }
299
300 *buf = scratch & 0xFF;
301
302 buf++;
303 scratch >>= 8;
304 chunk--;
305 len--;
306 }
307 }
308
309 sg_miter_stop(&host->sg_miter);
310
311 local_irq_restore(flags);
312}
313
314static void sdhci_write_block_pio(struct sdhci_host *host)
315{
316 unsigned long flags;
317 size_t blksize, len, chunk;
318 u32 scratch;
319 u8 *buf;
320
321 DBG("PIO writing\n");
322
323 blksize = host->data->blksz;
324 chunk = 0;
325 scratch = 0;
326
327 local_irq_save(flags);
328
329 while (blksize) {
330 if (!sg_miter_next(&host->sg_miter))
331 BUG();
332
333 len = min(host->sg_miter.length, blksize);
334
335 blksize -= len;
336 host->sg_miter.consumed = len;
337
338 buf = host->sg_miter.addr;
339
340 while (len) {
341 scratch |= (u32)*buf << (chunk * 8);
342
343 buf++;
344 chunk++;
345 len--;
346
347 if ((chunk == 4) || ((len == 0) && (blksize == 0))) {
348 sdhci_writel(host, scratch, SDHCI_BUFFER);
349 chunk = 0;
350 scratch = 0;
351 }
352 }
353 }
354
355 sg_miter_stop(&host->sg_miter);
356
357 local_irq_restore(flags);
358}
359
360static void sdhci_transfer_pio(struct sdhci_host *host)
361{
362 u32 mask;
363
364 BUG_ON(!host->data);
365
366 if (host->blocks == 0)
367 return;
368
369 if (host->data->flags & MMC_DATA_READ)
370 mask = SDHCI_DATA_AVAILABLE;
371 else
372 mask = SDHCI_SPACE_AVAILABLE;
373
374 /*
375 * Some controllers (JMicron JMB38x) mess up the buffer bits
376 * for transfers < 4 bytes. As long as it is just one block,
377 * we can ignore the bits.
378 */
379 if ((host->quirks & SDHCI_QUIRK_BROKEN_SMALL_PIO) &&
380 (host->data->blocks == 1))
381 mask = ~0;
382
383 while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) {
384 if (host->quirks & SDHCI_QUIRK_PIO_NEEDS_DELAY)
385 udelay(100);
386
387 if (host->data->flags & MMC_DATA_READ)
388 sdhci_read_block_pio(host);
389 else
390 sdhci_write_block_pio(host);
391
392 host->blocks--;
393 if (host->blocks == 0)
394 break;
395 }
396
397 DBG("PIO transfer complete.\n");
398}
399
400static char *sdhci_kmap_atomic(struct scatterlist *sg, unsigned long *flags)
401{
402 local_irq_save(*flags);
403 return kmap_atomic(sg_page(sg), KM_BIO_SRC_IRQ) + sg->offset;
404}
405
406static void sdhci_kunmap_atomic(void *buffer, unsigned long *flags)
407{
408 kunmap_atomic(buffer, KM_BIO_SRC_IRQ);
409 local_irq_restore(*flags);
410}
411
412static void sdhci_set_adma_desc(u8 *desc, u32 addr, int len, unsigned cmd)
413{
414 __le32 *dataddr = (__le32 __force *)(desc + 4);
415 __le16 *cmdlen = (__le16 __force *)desc;
416
417 /* SDHCI specification says ADMA descriptors should be 4 byte
418 * aligned, so using 16 or 32bit operations should be safe. */
419
420 cmdlen[0] = cpu_to_le16(cmd);
421 cmdlen[1] = cpu_to_le16(len);
422
423 dataddr[0] = cpu_to_le32(addr);
424}
425
426static int sdhci_adma_table_pre(struct sdhci_host *host,
427 struct mmc_data *data)
428{
429 int direction;
430
431 u8 *desc;
432 u8 *align;
433 dma_addr_t addr;
434 dma_addr_t align_addr;
435 int len, offset;
436
437 struct scatterlist *sg;
438 int i;
439 char *buffer;
440 unsigned long flags;
441
442 /*
443 * The spec does not specify endianness of descriptor table.
444 * We currently guess that it is LE.
445 */
446
447 if (data->flags & MMC_DATA_READ)
448 direction = DMA_FROM_DEVICE;
449 else
450 direction = DMA_TO_DEVICE;
451
452 /*
453 * The ADMA descriptor table is mapped further down as we
454 * need to fill it with data first.
455 */
456
457 host->align_addr = dma_map_single(mmc_dev(host->mmc),
458 host->align_buffer, 128 * 4, direction);
459 if (dma_mapping_error(mmc_dev(host->mmc), host->align_addr))
460 goto fail;
461 BUG_ON(host->align_addr & 0x3);
462
463 host->sg_count = dma_map_sg(mmc_dev(host->mmc),
464 data->sg, data->sg_len, direction);
465 if (host->sg_count == 0)
466 goto unmap_align;
467
468 desc = host->adma_desc;
469 align = host->align_buffer;
470
471 align_addr = host->align_addr;
472
473 for_each_sg(data->sg, sg, host->sg_count, i) {
474 addr = sg_dma_address(sg);
475 len = sg_dma_len(sg);
476
477 /*
478 * The SDHCI specification states that ADMA
479 * addresses must be 32-bit aligned. If they
480 * aren't, then we use a bounce buffer for
481 * the (up to three) bytes that screw up the
482 * alignment.
483 */
484 offset = (4 - (addr & 0x3)) & 0x3;
485 if (offset) {
486 if (data->flags & MMC_DATA_WRITE) {
487 buffer = sdhci_kmap_atomic(sg, &flags);
488 WARN_ON(((long)buffer & PAGE_MASK) > (PAGE_SIZE - 3));
489 memcpy(align, buffer, offset);
490 sdhci_kunmap_atomic(buffer, &flags);
491 }
492
493 /* tran, valid */
494 sdhci_set_adma_desc(desc, align_addr, offset, 0x21);
495
496 BUG_ON(offset > 65536);
497
498 align += 4;
499 align_addr += 4;
500
501 desc += 8;
502
503 addr += offset;
504 len -= offset;
505 }
506
507 BUG_ON(len > 65536);
508
509 /* tran, valid */
510 sdhci_set_adma_desc(desc, addr, len, 0x21);
511 desc += 8;
512
513 /*
514 * If this triggers then we have a calculation bug
515 * somewhere. :/
516 */
517 WARN_ON((desc - host->adma_desc) > (128 * 2 + 1) * 4);
518 }
519
520 if (host->quirks & SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC) {
521 /*
522 * Mark the last descriptor as the terminating descriptor
523 */
524 if (desc != host->adma_desc) {
525 desc -= 8;
526 desc[0] |= 0x2; /* end */
527 }
528 } else {
529 /*
530 * Add a terminating entry.
531 */
532
533 /* nop, end, valid */
534 sdhci_set_adma_desc(desc, 0, 0, 0x3);
535 }
536
537 /*
538 * Resync align buffer as we might have changed it.
539 */
540 if (data->flags & MMC_DATA_WRITE) {
541 dma_sync_single_for_device(mmc_dev(host->mmc),
542 host->align_addr, 128 * 4, direction);
543 }
544
545 host->adma_addr = dma_map_single(mmc_dev(host->mmc),
546 host->adma_desc, (128 * 2 + 1) * 4, DMA_TO_DEVICE);
547 if (dma_mapping_error(mmc_dev(host->mmc), host->adma_addr))
548 goto unmap_entries;
549 BUG_ON(host->adma_addr & 0x3);
550
551 return 0;
552
553unmap_entries:
554 dma_unmap_sg(mmc_dev(host->mmc), data->sg,
555 data->sg_len, direction);
556unmap_align:
557 dma_unmap_single(mmc_dev(host->mmc), host->align_addr,
558 128 * 4, direction);
559fail:
560 return -EINVAL;
561}
562
563static void sdhci_adma_table_post(struct sdhci_host *host,
564 struct mmc_data *data)
565{
566 int direction;
567
568 struct scatterlist *sg;
569 int i, size;
570 u8 *align;
571 char *buffer;
572 unsigned long flags;
573
574 if (data->flags & MMC_DATA_READ)
575 direction = DMA_FROM_DEVICE;
576 else
577 direction = DMA_TO_DEVICE;
578
579 dma_unmap_single(mmc_dev(host->mmc), host->adma_addr,
580 (128 * 2 + 1) * 4, DMA_TO_DEVICE);
581
582 dma_unmap_single(mmc_dev(host->mmc), host->align_addr,
583 128 * 4, direction);
584
585 if (data->flags & MMC_DATA_READ) {
586 dma_sync_sg_for_cpu(mmc_dev(host->mmc), data->sg,
587 data->sg_len, direction);
588
589 align = host->align_buffer;
590
591 for_each_sg(data->sg, sg, host->sg_count, i) {
592 if (sg_dma_address(sg) & 0x3) {
593 size = 4 - (sg_dma_address(sg) & 0x3);
594
595 buffer = sdhci_kmap_atomic(sg, &flags);
596 WARN_ON(((long)buffer & PAGE_MASK) > (PAGE_SIZE - 3));
597 memcpy(buffer, align, size);
598 sdhci_kunmap_atomic(buffer, &flags);
599
600 align += 4;
601 }
602 }
603 }
604
605 dma_unmap_sg(mmc_dev(host->mmc), data->sg,
606 data->sg_len, direction);
607}
608
609static u8 sdhci_calc_timeout(struct sdhci_host *host, struct mmc_command *cmd)
610{
611 u8 count;
612 struct mmc_data *data = cmd->data;
613 unsigned target_timeout, current_timeout;
614
615 /*
616 * If the host controller provides us with an incorrect timeout
617 * value, just skip the check and use 0xE. The hardware may take
618 * longer to time out, but that's much better than having a too-short
619 * timeout value.
620 */
621 if (host->quirks & SDHCI_QUIRK_BROKEN_TIMEOUT_VAL)
622 return 0xE;
623
624 /* Unspecified timeout, assume max */
625 if (!data && !cmd->cmd_timeout_ms)
626 return 0xE;
627
628 /* timeout in us */
629 if (!data)
630 target_timeout = cmd->cmd_timeout_ms * 1000;
631 else {
632 target_timeout = data->timeout_ns / 1000;
633 if (host->clock)
634 target_timeout += data->timeout_clks / host->clock;
635 }
636
637 /*
638 * Figure out needed cycles.
639 * We do this in steps in order to fit inside a 32 bit int.
640 * The first step is the minimum timeout, which will have a
641 * minimum resolution of 6 bits:
642 * (1) 2^13*1000 > 2^22,
643 * (2) host->timeout_clk < 2^16
644 * =>
645 * (1) / (2) > 2^6
646 */
647 count = 0;
648 current_timeout = (1 << 13) * 1000 / host->timeout_clk;
649 while (current_timeout < target_timeout) {
650 count++;
651 current_timeout <<= 1;
652 if (count >= 0xF)
653 break;
654 }
655
656 if (count >= 0xF) {
657 printk(KERN_WARNING "%s: Too large timeout requested for CMD%d!\n",
658 mmc_hostname(host->mmc), cmd->opcode);
659 count = 0xE;
660 }
661
662 return count;
663}
664
665static void sdhci_set_transfer_irqs(struct sdhci_host *host)
666{
667 u32 pio_irqs = SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL;
668 u32 dma_irqs = SDHCI_INT_DMA_END | SDHCI_INT_ADMA_ERROR;
669
670 if (host->flags & SDHCI_REQ_USE_DMA)
671 sdhci_clear_set_irqs(host, pio_irqs, dma_irqs);
672 else
673 sdhci_clear_set_irqs(host, dma_irqs, pio_irqs);
674}
675
676static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd)
677{
678 u8 count;
679 u8 ctrl;
680 struct mmc_data *data = cmd->data;
681 int ret;
682
683 WARN_ON(host->data);
684
685 if (data || (cmd->flags & MMC_RSP_BUSY)) {
686 count = sdhci_calc_timeout(host, cmd);
687 sdhci_writeb(host, count, SDHCI_TIMEOUT_CONTROL);
688 }
689
690 if (!data)
691 return;
692
693 /* Sanity checks */
694 BUG_ON(data->blksz * data->blocks > 524288);
695 BUG_ON(data->blksz > host->mmc->max_blk_size);
696 BUG_ON(data->blocks > 65535);
697
698 host->data = data;
699 host->data_early = 0;
700 host->data->bytes_xfered = 0;
701
702 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA))
703 host->flags |= SDHCI_REQ_USE_DMA;
704
705 /*
706 * FIXME: This doesn't account for merging when mapping the
707 * scatterlist.
708 */
709 if (host->flags & SDHCI_REQ_USE_DMA) {
710 int broken, i;
711 struct scatterlist *sg;
712
713 broken = 0;
714 if (host->flags & SDHCI_USE_ADMA) {
715 if (host->quirks & SDHCI_QUIRK_32BIT_ADMA_SIZE)
716 broken = 1;
717 } else {
718 if (host->quirks & SDHCI_QUIRK_32BIT_DMA_SIZE)
719 broken = 1;
720 }
721
722 if (unlikely(broken)) {
723 for_each_sg(data->sg, sg, data->sg_len, i) {
724 if (sg->length & 0x3) {
725 DBG("Reverting to PIO because of "
726 "transfer size (%d)\n",
727 sg->length);
728 host->flags &= ~SDHCI_REQ_USE_DMA;
729 break;
730 }
731 }
732 }
733 }
734
735 /*
736 * The assumption here being that alignment is the same after
737 * translation to device address space.
738 */
739 if (host->flags & SDHCI_REQ_USE_DMA) {
740 int broken, i;
741 struct scatterlist *sg;
742
743 broken = 0;
744 if (host->flags & SDHCI_USE_ADMA) {
745 /*
746 * As we use 3 byte chunks to work around
747 * alignment problems, we need to check this
748 * quirk.
749 */
750 if (host->quirks & SDHCI_QUIRK_32BIT_ADMA_SIZE)
751 broken = 1;
752 } else {
753 if (host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR)
754 broken = 1;
755 }
756
757 if (unlikely(broken)) {
758 for_each_sg(data->sg, sg, data->sg_len, i) {
759 if (sg->offset & 0x3) {
760 DBG("Reverting to PIO because of "
761 "bad alignment\n");
762 host->flags &= ~SDHCI_REQ_USE_DMA;
763 break;
764 }
765 }
766 }
767 }
768
769 if (host->flags & SDHCI_REQ_USE_DMA) {
770 if (host->flags & SDHCI_USE_ADMA) {
771 ret = sdhci_adma_table_pre(host, data);
772 if (ret) {
773 /*
774 * This only happens when someone fed
775 * us an invalid request.
776 */
777 WARN_ON(1);
778 host->flags &= ~SDHCI_REQ_USE_DMA;
779 } else {
780 sdhci_writel(host, host->adma_addr,
781 SDHCI_ADMA_ADDRESS);
782 }
783 } else {
784 int sg_cnt;
785
786 sg_cnt = dma_map_sg(mmc_dev(host->mmc),
787 data->sg, data->sg_len,
788 (data->flags & MMC_DATA_READ) ?
789 DMA_FROM_DEVICE :
790 DMA_TO_DEVICE);
791 if (sg_cnt == 0) {
792 /*
793 * This only happens when someone fed
794 * us an invalid request.
795 */
796 WARN_ON(1);
797 host->flags &= ~SDHCI_REQ_USE_DMA;
798 } else {
799 WARN_ON(sg_cnt != 1);
800 sdhci_writel(host, sg_dma_address(data->sg),
801 SDHCI_DMA_ADDRESS);
802 }
803 }
804 }
805
806 /*
807 * Always adjust the DMA selection as some controllers
808 * (e.g. JMicron) can't do PIO properly when the selection
809 * is ADMA.
810 */
811 if (host->version >= SDHCI_SPEC_200) {
812 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
813 ctrl &= ~SDHCI_CTRL_DMA_MASK;
814 if ((host->flags & SDHCI_REQ_USE_DMA) &&
815 (host->flags & SDHCI_USE_ADMA))
816 ctrl |= SDHCI_CTRL_ADMA32;
817 else
818 ctrl |= SDHCI_CTRL_SDMA;
819 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
820 }
821
822 if (!(host->flags & SDHCI_REQ_USE_DMA)) {
823 int flags;
824
825 flags = SG_MITER_ATOMIC;
826 if (host->data->flags & MMC_DATA_READ)
827 flags |= SG_MITER_TO_SG;
828 else
829 flags |= SG_MITER_FROM_SG;
830 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
831 host->blocks = data->blocks;
832 }
833
834 sdhci_set_transfer_irqs(host);
835
836 /* Set the DMA boundary value and block size */
837 sdhci_writew(host, SDHCI_MAKE_BLKSZ(SDHCI_DEFAULT_BOUNDARY_ARG,
838 data->blksz), SDHCI_BLOCK_SIZE);
839 sdhci_writew(host, data->blocks, SDHCI_BLOCK_COUNT);
840}
841
842static void sdhci_set_transfer_mode(struct sdhci_host *host,
843 struct mmc_command *cmd)
844{
845 u16 mode;
846 struct mmc_data *data = cmd->data;
847
848 if (data == NULL)
849 return;
850
851 WARN_ON(!host->data);
852
853 mode = SDHCI_TRNS_BLK_CNT_EN;
854 if (mmc_op_multi(cmd->opcode) || data->blocks > 1) {
855 mode |= SDHCI_TRNS_MULTI;
856 /*
857 * If we are sending CMD23, CMD12 never gets sent
858 * on successful completion (so no Auto-CMD12).
859 */
860 if (!host->mrq->sbc && (host->flags & SDHCI_AUTO_CMD12))
861 mode |= SDHCI_TRNS_AUTO_CMD12;
862 else if (host->mrq->sbc && (host->flags & SDHCI_AUTO_CMD23)) {
863 mode |= SDHCI_TRNS_AUTO_CMD23;
864 sdhci_writel(host, host->mrq->sbc->arg, SDHCI_ARGUMENT2);
865 }
866 }
867
868 if (data->flags & MMC_DATA_READ)
869 mode |= SDHCI_TRNS_READ;
870 if (host->flags & SDHCI_REQ_USE_DMA)
871 mode |= SDHCI_TRNS_DMA;
872
873 sdhci_writew(host, mode, SDHCI_TRANSFER_MODE);
874}
875
876static void sdhci_finish_data(struct sdhci_host *host)
877{
878 struct mmc_data *data;
879
880 BUG_ON(!host->data);
881
882 data = host->data;
883 host->data = NULL;
884
885 if (host->flags & SDHCI_REQ_USE_DMA) {
886 if (host->flags & SDHCI_USE_ADMA)
887 sdhci_adma_table_post(host, data);
888 else {
889 dma_unmap_sg(mmc_dev(host->mmc), data->sg,
890 data->sg_len, (data->flags & MMC_DATA_READ) ?
891 DMA_FROM_DEVICE : DMA_TO_DEVICE);
892 }
893 }
894
895 /*
896 * The specification states that the block count register must
897 * be updated, but it does not specify at what point in the
898 * data flow. That makes the register entirely useless to read
899 * back so we have to assume that nothing made it to the card
900 * in the event of an error.
901 */
902 if (data->error)
903 data->bytes_xfered = 0;
904 else
905 data->bytes_xfered = data->blksz * data->blocks;
906
907 /*
908 * Need to send CMD12 if -
909 * a) open-ended multiblock transfer (no CMD23)
910 * b) error in multiblock transfer
911 */
912 if (data->stop &&
913 (data->error ||
914 !host->mrq->sbc)) {
915
916 /*
917 * The controller needs a reset of internal state machines
918 * upon error conditions.
919 */
920 if (data->error) {
921 sdhci_reset(host, SDHCI_RESET_CMD);
922 sdhci_reset(host, SDHCI_RESET_DATA);
923 }
924
925 sdhci_send_command(host, data->stop);
926 } else
927 tasklet_schedule(&host->finish_tasklet);
928}
929
930static void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
931{
932 int flags;
933 u32 mask;
934 unsigned long timeout;
935
936 WARN_ON(host->cmd);
937
938 /* Wait max 10 ms */
939 timeout = 10;
940
941 mask = SDHCI_CMD_INHIBIT;
942 if ((cmd->data != NULL) || (cmd->flags & MMC_RSP_BUSY))
943 mask |= SDHCI_DATA_INHIBIT;
944
945 /* We shouldn't wait for data inihibit for stop commands, even
946 though they might use busy signaling */
947 if (host->mrq->data && (cmd == host->mrq->data->stop))
948 mask &= ~SDHCI_DATA_INHIBIT;
949
950 while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) {
951 if (timeout == 0) {
952 printk(KERN_ERR "%s: Controller never released "
953 "inhibit bit(s).\n", mmc_hostname(host->mmc));
954 sdhci_dumpregs(host);
955 cmd->error = -EIO;
956 tasklet_schedule(&host->finish_tasklet);
957 return;
958 }
959 timeout--;
960 mdelay(1);
961 }
962
963 mod_timer(&host->timer, jiffies + 10 * HZ);
964
965 host->cmd = cmd;
966
967 sdhci_prepare_data(host, cmd);
968
969 sdhci_writel(host, cmd->arg, SDHCI_ARGUMENT);
970
971 sdhci_set_transfer_mode(host, cmd);
972
973 if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
974 printk(KERN_ERR "%s: Unsupported response type!\n",
975 mmc_hostname(host->mmc));
976 cmd->error = -EINVAL;
977 tasklet_schedule(&host->finish_tasklet);
978 return;
979 }
980
981 if (!(cmd->flags & MMC_RSP_PRESENT))
982 flags = SDHCI_CMD_RESP_NONE;
983 else if (cmd->flags & MMC_RSP_136)
984 flags = SDHCI_CMD_RESP_LONG;
985 else if (cmd->flags & MMC_RSP_BUSY)
986 flags = SDHCI_CMD_RESP_SHORT_BUSY;
987 else
988 flags = SDHCI_CMD_RESP_SHORT;
989
990 if (cmd->flags & MMC_RSP_CRC)
991 flags |= SDHCI_CMD_CRC;
992 if (cmd->flags & MMC_RSP_OPCODE)
993 flags |= SDHCI_CMD_INDEX;
994
995 /* CMD19 is special in that the Data Present Select should be set */
996 if (cmd->data || (cmd->opcode == MMC_SEND_TUNING_BLOCK))
997 flags |= SDHCI_CMD_DATA;
998
999 sdhci_writew(host, SDHCI_MAKE_CMD(cmd->opcode, flags), SDHCI_COMMAND);
1000}
1001
1002static void sdhci_finish_command(struct sdhci_host *host)
1003{
1004 int i;
1005
1006 BUG_ON(host->cmd == NULL);
1007
1008 if (host->cmd->flags & MMC_RSP_PRESENT) {
1009 if (host->cmd->flags & MMC_RSP_136) {
1010 /* CRC is stripped so we need to do some shifting. */
1011 for (i = 0;i < 4;i++) {
1012 host->cmd->resp[i] = sdhci_readl(host,
1013 SDHCI_RESPONSE + (3-i)*4) << 8;
1014 if (i != 3)
1015 host->cmd->resp[i] |=
1016 sdhci_readb(host,
1017 SDHCI_RESPONSE + (3-i)*4-1);
1018 }
1019 } else {
1020 host->cmd->resp[0] = sdhci_readl(host, SDHCI_RESPONSE);
1021 }
1022 }
1023
1024 host->cmd->error = 0;
1025
1026 /* Finished CMD23, now send actual command. */
1027 if (host->cmd == host->mrq->sbc) {
1028 host->cmd = NULL;
1029 sdhci_send_command(host, host->mrq->cmd);
1030 } else {
1031
1032 /* Processed actual command. */
1033 if (host->data && host->data_early)
1034 sdhci_finish_data(host);
1035
1036 if (!host->cmd->data)
1037 tasklet_schedule(&host->finish_tasklet);
1038
1039 host->cmd = NULL;
1040 }
1041}
1042
1043static void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
1044{
1045 int div = 0; /* Initialized for compiler warning */
1046 u16 clk = 0;
1047 unsigned long timeout;
1048
1049 if (clock == host->clock)
1050 return;
1051
1052 if (host->ops->set_clock) {
1053 host->ops->set_clock(host, clock);
1054 if (host->quirks & SDHCI_QUIRK_NONSTANDARD_CLOCK)
1055 return;
1056 }
1057
1058 sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
1059
1060 if (clock == 0)
1061 goto out;
1062
1063 if (host->version >= SDHCI_SPEC_300) {
1064 /*
1065 * Check if the Host Controller supports Programmable Clock
1066 * Mode.
1067 */
1068 if (host->clk_mul) {
1069 u16 ctrl;
1070
1071 /*
1072 * We need to figure out whether the Host Driver needs
1073 * to select Programmable Clock Mode, or the value can
1074 * be set automatically by the Host Controller based on
1075 * the Preset Value registers.
1076 */
1077 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1078 if (!(ctrl & SDHCI_CTRL_PRESET_VAL_ENABLE)) {
1079 for (div = 1; div <= 1024; div++) {
1080 if (((host->max_clk * host->clk_mul) /
1081 div) <= clock)
1082 break;
1083 }
1084 /*
1085 * Set Programmable Clock Mode in the Clock
1086 * Control register.
1087 */
1088 clk = SDHCI_PROG_CLOCK_MODE;
1089 div--;
1090 }
1091 } else {
1092 /* Version 3.00 divisors must be a multiple of 2. */
1093 if (host->max_clk <= clock)
1094 div = 1;
1095 else {
1096 for (div = 2; div < SDHCI_MAX_DIV_SPEC_300;
1097 div += 2) {
1098 if ((host->max_clk / div) <= clock)
1099 break;
1100 }
1101 }
1102 div >>= 1;
1103 }
1104 } else {
1105 /* Version 2.00 divisors must be a power of 2. */
1106 for (div = 1; div < SDHCI_MAX_DIV_SPEC_200; div *= 2) {
1107 if ((host->max_clk / div) <= clock)
1108 break;
1109 }
1110 div >>= 1;
1111 }
1112
1113 clk |= (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT;
1114 clk |= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN)
1115 << SDHCI_DIVIDER_HI_SHIFT;
1116 clk |= SDHCI_CLOCK_INT_EN;
1117 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1118
1119 /* Wait max 20 ms */
1120 timeout = 20;
1121 while (!((clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL))
1122 & SDHCI_CLOCK_INT_STABLE)) {
1123 if (timeout == 0) {
1124 printk(KERN_ERR "%s: Internal clock never "
1125 "stabilised.\n", mmc_hostname(host->mmc));
1126 sdhci_dumpregs(host);
1127 return;
1128 }
1129 timeout--;
1130 mdelay(1);
1131 }
1132
1133 clk |= SDHCI_CLOCK_CARD_EN;
1134 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1135
1136out:
1137 host->clock = clock;
1138}
1139
1140static void sdhci_set_power(struct sdhci_host *host, unsigned short power)
1141{
1142 u8 pwr = 0;
1143
1144 if (power != (unsigned short)-1) {
1145 switch (1 << power) {
1146 case MMC_VDD_165_195:
1147 pwr = SDHCI_POWER_180;
1148 break;
1149 case MMC_VDD_29_30:
1150 case MMC_VDD_30_31:
1151 pwr = SDHCI_POWER_300;
1152 break;
1153 case MMC_VDD_32_33:
1154 case MMC_VDD_33_34:
1155 pwr = SDHCI_POWER_330;
1156 break;
1157 default:
1158 BUG();
1159 }
1160 }
1161
1162 if (host->pwr == pwr)
1163 return;
1164
1165 host->pwr = pwr;
1166
1167 if (pwr == 0) {
1168 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
1169 return;
1170 }
1171
1172 /*
1173 * Spec says that we should clear the power reg before setting
1174 * a new value. Some controllers don't seem to like this though.
1175 */
1176 if (!(host->quirks & SDHCI_QUIRK_SINGLE_POWER_WRITE))
1177 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
1178
1179 /*
1180 * At least the Marvell CaFe chip gets confused if we set the voltage
1181 * and set turn on power at the same time, so set the voltage first.
1182 */
1183 if (host->quirks & SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER)
1184 sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
1185
1186 pwr |= SDHCI_POWER_ON;
1187
1188 sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
1189
1190 /*
1191 * Some controllers need an extra 10ms delay of 10ms before they
1192 * can apply clock after applying power
1193 */
1194 if (host->quirks & SDHCI_QUIRK_DELAY_AFTER_POWER)
1195 mdelay(10);
1196}
1197
1198/*****************************************************************************\
1199 * *
1200 * MMC callbacks *
1201 * *
1202\*****************************************************************************/
1203
1204static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
1205{
1206 struct sdhci_host *host;
1207 bool present;
1208 unsigned long flags;
1209
1210 host = mmc_priv(mmc);
1211
1212 spin_lock_irqsave(&host->lock, flags);
1213
1214 WARN_ON(host->mrq != NULL);
1215
1216#ifndef SDHCI_USE_LEDS_CLASS
1217 sdhci_activate_led(host);
1218#endif
1219
1220 /*
1221 * Ensure we don't send the STOP for non-SET_BLOCK_COUNTED
1222 * requests if Auto-CMD12 is enabled.
1223 */
1224 if (!mrq->sbc && (host->flags & SDHCI_AUTO_CMD12)) {
1225 if (mrq->stop) {
1226 mrq->data->stop = NULL;
1227 mrq->stop = NULL;
1228 }
1229 }
1230
1231 host->mrq = mrq;
1232
1233 /* If polling, assume that the card is always present. */
1234 if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
1235 present = true;
1236 else
1237 present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
1238 SDHCI_CARD_PRESENT;
1239
1240 if (!present || host->flags & SDHCI_DEVICE_DEAD) {
1241 host->mrq->cmd->error = -ENOMEDIUM;
1242 tasklet_schedule(&host->finish_tasklet);
1243 } else {
1244 u32 present_state;
1245
1246 present_state = sdhci_readl(host, SDHCI_PRESENT_STATE);
1247 /*
1248 * Check if the re-tuning timer has already expired and there
1249 * is no on-going data transfer. If so, we need to execute
1250 * tuning procedure before sending command.
1251 */
1252 if ((host->flags & SDHCI_NEEDS_RETUNING) &&
1253 !(present_state & (SDHCI_DOING_WRITE | SDHCI_DOING_READ))) {
1254 spin_unlock_irqrestore(&host->lock, flags);
1255 sdhci_execute_tuning(mmc);
1256 spin_lock_irqsave(&host->lock, flags);
1257
1258 /* Restore original mmc_request structure */
1259 host->mrq = mrq;
1260 }
1261
1262 if (mrq->sbc && !(host->flags & SDHCI_AUTO_CMD23))
1263 sdhci_send_command(host, mrq->sbc);
1264 else
1265 sdhci_send_command(host, mrq->cmd);
1266 }
1267
1268 mmiowb();
1269 spin_unlock_irqrestore(&host->lock, flags);
1270}
1271
1272static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1273{
1274 struct sdhci_host *host;
1275 unsigned long flags;
1276 u8 ctrl;
1277
1278 host = mmc_priv(mmc);
1279
1280 spin_lock_irqsave(&host->lock, flags);
1281
1282 if (host->flags & SDHCI_DEVICE_DEAD)
1283 goto out;
1284
1285 /*
1286 * Reset the chip on each power off.
1287 * Should clear out any weird states.
1288 */
1289 if (ios->power_mode == MMC_POWER_OFF) {
1290 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
1291 sdhci_reinit(host);
1292 }
1293
1294 sdhci_set_clock(host, ios->clock);
1295
1296 if (ios->power_mode == MMC_POWER_OFF)
1297 sdhci_set_power(host, -1);
1298 else
1299 sdhci_set_power(host, ios->vdd);
1300
1301 if (host->ops->platform_send_init_74_clocks)
1302 host->ops->platform_send_init_74_clocks(host, ios->power_mode);
1303
1304 /*
1305 * If your platform has 8-bit width support but is not a v3 controller,
1306 * or if it requires special setup code, you should implement that in
1307 * platform_8bit_width().
1308 */
1309 if (host->ops->platform_8bit_width)
1310 host->ops->platform_8bit_width(host, ios->bus_width);
1311 else {
1312 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
1313 if (ios->bus_width == MMC_BUS_WIDTH_8) {
1314 ctrl &= ~SDHCI_CTRL_4BITBUS;
1315 if (host->version >= SDHCI_SPEC_300)
1316 ctrl |= SDHCI_CTRL_8BITBUS;
1317 } else {
1318 if (host->version >= SDHCI_SPEC_300)
1319 ctrl &= ~SDHCI_CTRL_8BITBUS;
1320 if (ios->bus_width == MMC_BUS_WIDTH_4)
1321 ctrl |= SDHCI_CTRL_4BITBUS;
1322 else
1323 ctrl &= ~SDHCI_CTRL_4BITBUS;
1324 }
1325 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1326 }
1327
1328 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
1329
1330 if ((ios->timing == MMC_TIMING_SD_HS ||
1331 ios->timing == MMC_TIMING_MMC_HS)
1332 && !(host->quirks & SDHCI_QUIRK_NO_HISPD_BIT))
1333 ctrl |= SDHCI_CTRL_HISPD;
1334 else
1335 ctrl &= ~SDHCI_CTRL_HISPD;
1336
1337 if (host->version >= SDHCI_SPEC_300) {
1338 u16 clk, ctrl_2;
1339 unsigned int clock;
1340
1341 /* In case of UHS-I modes, set High Speed Enable */
1342 if ((ios->timing == MMC_TIMING_UHS_SDR50) ||
1343 (ios->timing == MMC_TIMING_UHS_SDR104) ||
1344 (ios->timing == MMC_TIMING_UHS_DDR50) ||
1345 (ios->timing == MMC_TIMING_UHS_SDR25) ||
1346 (ios->timing == MMC_TIMING_UHS_SDR12))
1347 ctrl |= SDHCI_CTRL_HISPD;
1348
1349 ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1350 if (!(ctrl_2 & SDHCI_CTRL_PRESET_VAL_ENABLE)) {
1351 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1352 /*
1353 * We only need to set Driver Strength if the
1354 * preset value enable is not set.
1355 */
1356 ctrl_2 &= ~SDHCI_CTRL_DRV_TYPE_MASK;
1357 if (ios->drv_type == MMC_SET_DRIVER_TYPE_A)
1358 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_A;
1359 else if (ios->drv_type == MMC_SET_DRIVER_TYPE_C)
1360 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_C;
1361
1362 sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
1363 } else {
1364 /*
1365 * According to SDHC Spec v3.00, if the Preset Value
1366 * Enable in the Host Control 2 register is set, we
1367 * need to reset SD Clock Enable before changing High
1368 * Speed Enable to avoid generating clock gliches.
1369 */
1370
1371 /* Reset SD Clock Enable */
1372 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1373 clk &= ~SDHCI_CLOCK_CARD_EN;
1374 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1375
1376 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1377
1378 /* Re-enable SD Clock */
1379 clock = host->clock;
1380 host->clock = 0;
1381 sdhci_set_clock(host, clock);
1382 }
1383
1384
1385 /* Reset SD Clock Enable */
1386 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1387 clk &= ~SDHCI_CLOCK_CARD_EN;
1388 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1389
1390 if (host->ops->set_uhs_signaling)
1391 host->ops->set_uhs_signaling(host, ios->timing);
1392 else {
1393 ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1394 /* Select Bus Speed Mode for host */
1395 ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
1396 if (ios->timing == MMC_TIMING_UHS_SDR12)
1397 ctrl_2 |= SDHCI_CTRL_UHS_SDR12;
1398 else if (ios->timing == MMC_TIMING_UHS_SDR25)
1399 ctrl_2 |= SDHCI_CTRL_UHS_SDR25;
1400 else if (ios->timing == MMC_TIMING_UHS_SDR50)
1401 ctrl_2 |= SDHCI_CTRL_UHS_SDR50;
1402 else if (ios->timing == MMC_TIMING_UHS_SDR104)
1403 ctrl_2 |= SDHCI_CTRL_UHS_SDR104;
1404 else if (ios->timing == MMC_TIMING_UHS_DDR50)
1405 ctrl_2 |= SDHCI_CTRL_UHS_DDR50;
1406 sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
1407 }
1408
1409 /* Re-enable SD Clock */
1410 clock = host->clock;
1411 host->clock = 0;
1412 sdhci_set_clock(host, clock);
1413 } else
1414 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1415
1416 /*
1417 * Some (ENE) controllers go apeshit on some ios operation,
1418 * signalling timeout and CRC errors even on CMD0. Resetting
1419 * it on each ios seems to solve the problem.
1420 */
1421 if(host->quirks & SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS)
1422 sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
1423
1424out:
1425 mmiowb();
1426 spin_unlock_irqrestore(&host->lock, flags);
1427}
1428
1429static int check_ro(struct sdhci_host *host)
1430{
1431 unsigned long flags;
1432 int is_readonly;
1433
1434 spin_lock_irqsave(&host->lock, flags);
1435
1436 if (host->flags & SDHCI_DEVICE_DEAD)
1437 is_readonly = 0;
1438 else if (host->ops->get_ro)
1439 is_readonly = host->ops->get_ro(host);
1440 else
1441 is_readonly = !(sdhci_readl(host, SDHCI_PRESENT_STATE)
1442 & SDHCI_WRITE_PROTECT);
1443
1444 spin_unlock_irqrestore(&host->lock, flags);
1445
1446 /* This quirk needs to be replaced by a callback-function later */
1447 return host->quirks & SDHCI_QUIRK_INVERTED_WRITE_PROTECT ?
1448 !is_readonly : is_readonly;
1449}
1450
1451#define SAMPLE_COUNT 5
1452
1453static int sdhci_get_ro(struct mmc_host *mmc)
1454{
1455 struct sdhci_host *host;
1456 int i, ro_count;
1457
1458 host = mmc_priv(mmc);
1459
1460 if (!(host->quirks & SDHCI_QUIRK_UNSTABLE_RO_DETECT))
1461 return check_ro(host);
1462
1463 ro_count = 0;
1464 for (i = 0; i < SAMPLE_COUNT; i++) {
1465 if (check_ro(host)) {
1466 if (++ro_count > SAMPLE_COUNT / 2)
1467 return 1;
1468 }
1469 msleep(30);
1470 }
1471 return 0;
1472}
1473
1474static void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable)
1475{
1476 struct sdhci_host *host;
1477 unsigned long flags;
1478
1479 host = mmc_priv(mmc);
1480
1481 spin_lock_irqsave(&host->lock, flags);
1482
1483 if (host->flags & SDHCI_DEVICE_DEAD)
1484 goto out;
1485
1486 if (enable)
1487 sdhci_unmask_irqs(host, SDHCI_INT_CARD_INT);
1488 else
1489 sdhci_mask_irqs(host, SDHCI_INT_CARD_INT);
1490out:
1491 mmiowb();
1492
1493 spin_unlock_irqrestore(&host->lock, flags);
1494}
1495
1496static int sdhci_start_signal_voltage_switch(struct mmc_host *mmc,
1497 struct mmc_ios *ios)
1498{
1499 struct sdhci_host *host;
1500 u8 pwr;
1501 u16 clk, ctrl;
1502 u32 present_state;
1503
1504 host = mmc_priv(mmc);
1505
1506 /*
1507 * Signal Voltage Switching is only applicable for Host Controllers
1508 * v3.00 and above.
1509 */
1510 if (host->version < SDHCI_SPEC_300)
1511 return 0;
1512
1513 /*
1514 * We first check whether the request is to set signalling voltage
1515 * to 3.3V. If so, we change the voltage to 3.3V and return quickly.
1516 */
1517 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1518 if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
1519 /* Set 1.8V Signal Enable in the Host Control2 register to 0 */
1520 ctrl &= ~SDHCI_CTRL_VDD_180;
1521 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1522
1523 /* Wait for 5ms */
1524 usleep_range(5000, 5500);
1525
1526 /* 3.3V regulator output should be stable within 5 ms */
1527 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1528 if (!(ctrl & SDHCI_CTRL_VDD_180))
1529 return 0;
1530 else {
1531 printk(KERN_INFO DRIVER_NAME ": Switching to 3.3V "
1532 "signalling voltage failed\n");
1533 return -EIO;
1534 }
1535 } else if (!(ctrl & SDHCI_CTRL_VDD_180) &&
1536 (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_180)) {
1537 /* Stop SDCLK */
1538 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1539 clk &= ~SDHCI_CLOCK_CARD_EN;
1540 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1541
1542 /* Check whether DAT[3:0] is 0000 */
1543 present_state = sdhci_readl(host, SDHCI_PRESENT_STATE);
1544 if (!((present_state & SDHCI_DATA_LVL_MASK) >>
1545 SDHCI_DATA_LVL_SHIFT)) {
1546 /*
1547 * Enable 1.8V Signal Enable in the Host Control2
1548 * register
1549 */
1550 ctrl |= SDHCI_CTRL_VDD_180;
1551 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1552
1553 /* Wait for 5ms */
1554 usleep_range(5000, 5500);
1555
1556 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1557 if (ctrl & SDHCI_CTRL_VDD_180) {
1558 /* Provide SDCLK again and wait for 1ms*/
1559 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1560 clk |= SDHCI_CLOCK_CARD_EN;
1561 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1562 usleep_range(1000, 1500);
1563
1564 /*
1565 * If DAT[3:0] level is 1111b, then the card
1566 * was successfully switched to 1.8V signaling.
1567 */
1568 present_state = sdhci_readl(host,
1569 SDHCI_PRESENT_STATE);
1570 if ((present_state & SDHCI_DATA_LVL_MASK) ==
1571 SDHCI_DATA_LVL_MASK)
1572 return 0;
1573 }
1574 }
1575
1576 /*
1577 * If we are here, that means the switch to 1.8V signaling
1578 * failed. We power cycle the card, and retry initialization
1579 * sequence by setting S18R to 0.
1580 */
1581 pwr = sdhci_readb(host, SDHCI_POWER_CONTROL);
1582 pwr &= ~SDHCI_POWER_ON;
1583 sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
1584
1585 /* Wait for 1ms as per the spec */
1586 usleep_range(1000, 1500);
1587 pwr |= SDHCI_POWER_ON;
1588 sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
1589
1590 printk(KERN_INFO DRIVER_NAME ": Switching to 1.8V signalling "
1591 "voltage failed, retrying with S18R set to 0\n");
1592 return -EAGAIN;
1593 } else
1594 /* No signal voltage switch required */
1595 return 0;
1596}
1597
1598static int sdhci_execute_tuning(struct mmc_host *mmc)
1599{
1600 struct sdhci_host *host;
1601 u16 ctrl;
1602 u32 ier;
1603 int tuning_loop_counter = MAX_TUNING_LOOP;
1604 unsigned long timeout;
1605 int err = 0;
1606
1607 host = mmc_priv(mmc);
1608
1609 disable_irq(host->irq);
1610 spin_lock(&host->lock);
1611
1612 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1613
1614 /*
1615 * Host Controller needs tuning only in case of SDR104 mode
1616 * and for SDR50 mode when Use Tuning for SDR50 is set in
1617 * Capabilities register.
1618 */
1619 if (((ctrl & SDHCI_CTRL_UHS_MASK) == SDHCI_CTRL_UHS_SDR104) ||
1620 (((ctrl & SDHCI_CTRL_UHS_MASK) == SDHCI_CTRL_UHS_SDR50) &&
1621 (host->flags & SDHCI_SDR50_NEEDS_TUNING)))
1622 ctrl |= SDHCI_CTRL_EXEC_TUNING;
1623 else {
1624 spin_unlock(&host->lock);
1625 enable_irq(host->irq);
1626 return 0;
1627 }
1628
1629 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1630
1631 /*
1632 * As per the Host Controller spec v3.00, tuning command
1633 * generates Buffer Read Ready interrupt, so enable that.
1634 *
1635 * Note: The spec clearly says that when tuning sequence
1636 * is being performed, the controller does not generate
1637 * interrupts other than Buffer Read Ready interrupt. But
1638 * to make sure we don't hit a controller bug, we _only_
1639 * enable Buffer Read Ready interrupt here.
1640 */
1641 ier = sdhci_readl(host, SDHCI_INT_ENABLE);
1642 sdhci_clear_set_irqs(host, ier, SDHCI_INT_DATA_AVAIL);
1643
1644 /*
1645 * Issue CMD19 repeatedly till Execute Tuning is set to 0 or the number
1646 * of loops reaches 40 times or a timeout of 150ms occurs.
1647 */
1648 timeout = 150;
1649 do {
1650 struct mmc_command cmd = {0};
1651 struct mmc_request mrq = {0};
1652
1653 if (!tuning_loop_counter && !timeout)
1654 break;
1655
1656 cmd.opcode = MMC_SEND_TUNING_BLOCK;
1657 cmd.arg = 0;
1658 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
1659 cmd.retries = 0;
1660 cmd.data = NULL;
1661 cmd.error = 0;
1662
1663 mrq.cmd = &cmd;
1664 host->mrq = &mrq;
1665
1666 /*
1667 * In response to CMD19, the card sends 64 bytes of tuning
1668 * block to the Host Controller. So we set the block size
1669 * to 64 here.
1670 */
1671 sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, 64), SDHCI_BLOCK_SIZE);
1672
1673 /*
1674 * The tuning block is sent by the card to the host controller.
1675 * So we set the TRNS_READ bit in the Transfer Mode register.
1676 * This also takes care of setting DMA Enable and Multi Block
1677 * Select in the same register to 0.
1678 */
1679 sdhci_writew(host, SDHCI_TRNS_READ, SDHCI_TRANSFER_MODE);
1680
1681 sdhci_send_command(host, &cmd);
1682
1683 host->cmd = NULL;
1684 host->mrq = NULL;
1685
1686 spin_unlock(&host->lock);
1687 enable_irq(host->irq);
1688
1689 /* Wait for Buffer Read Ready interrupt */
1690 wait_event_interruptible_timeout(host->buf_ready_int,
1691 (host->tuning_done == 1),
1692 msecs_to_jiffies(50));
1693 disable_irq(host->irq);
1694 spin_lock(&host->lock);
1695
1696 if (!host->tuning_done) {
1697 printk(KERN_INFO DRIVER_NAME ": Timeout waiting for "
1698 "Buffer Read Ready interrupt during tuning "
1699 "procedure, falling back to fixed sampling "
1700 "clock\n");
1701 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1702 ctrl &= ~SDHCI_CTRL_TUNED_CLK;
1703 ctrl &= ~SDHCI_CTRL_EXEC_TUNING;
1704 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1705
1706 err = -EIO;
1707 goto out;
1708 }
1709
1710 host->tuning_done = 0;
1711
1712 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1713 tuning_loop_counter--;
1714 timeout--;
1715 mdelay(1);
1716 } while (ctrl & SDHCI_CTRL_EXEC_TUNING);
1717
1718 /*
1719 * The Host Driver has exhausted the maximum number of loops allowed,
1720 * so use fixed sampling frequency.
1721 */
1722 if (!tuning_loop_counter || !timeout) {
1723 ctrl &= ~SDHCI_CTRL_TUNED_CLK;
1724 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1725 } else {
1726 if (!(ctrl & SDHCI_CTRL_TUNED_CLK)) {
1727 printk(KERN_INFO DRIVER_NAME ": Tuning procedure"
1728 " failed, falling back to fixed sampling"
1729 " clock\n");
1730 err = -EIO;
1731 }
1732 }
1733
1734out:
1735 /*
1736 * If this is the very first time we are here, we start the retuning
1737 * timer. Since only during the first time, SDHCI_NEEDS_RETUNING
1738 * flag won't be set, we check this condition before actually starting
1739 * the timer.
1740 */
1741 if (!(host->flags & SDHCI_NEEDS_RETUNING) && host->tuning_count &&
1742 (host->tuning_mode == SDHCI_TUNING_MODE_1)) {
1743 mod_timer(&host->tuning_timer, jiffies +
1744 host->tuning_count * HZ);
1745 /* Tuning mode 1 limits the maximum data length to 4MB */
1746 mmc->max_blk_count = (4 * 1024 * 1024) / mmc->max_blk_size;
1747 } else {
1748 host->flags &= ~SDHCI_NEEDS_RETUNING;
1749 /* Reload the new initial value for timer */
1750 if (host->tuning_mode == SDHCI_TUNING_MODE_1)
1751 mod_timer(&host->tuning_timer, jiffies +
1752 host->tuning_count * HZ);
1753 }
1754
1755 /*
1756 * In case tuning fails, host controllers which support re-tuning can
1757 * try tuning again at a later time, when the re-tuning timer expires.
1758 * So for these controllers, we return 0. Since there might be other
1759 * controllers who do not have this capability, we return error for
1760 * them.
1761 */
1762 if (err && host->tuning_count &&
1763 host->tuning_mode == SDHCI_TUNING_MODE_1)
1764 err = 0;
1765
1766 sdhci_clear_set_irqs(host, SDHCI_INT_DATA_AVAIL, ier);
1767 spin_unlock(&host->lock);
1768 enable_irq(host->irq);
1769
1770 return err;
1771}
1772
1773static void sdhci_enable_preset_value(struct mmc_host *mmc, bool enable)
1774{
1775 struct sdhci_host *host;
1776 u16 ctrl;
1777 unsigned long flags;
1778
1779 host = mmc_priv(mmc);
1780
1781 /* Host Controller v3.00 defines preset value registers */
1782 if (host->version < SDHCI_SPEC_300)
1783 return;
1784
1785 spin_lock_irqsave(&host->lock, flags);
1786
1787 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1788
1789 /*
1790 * We only enable or disable Preset Value if they are not already
1791 * enabled or disabled respectively. Otherwise, we bail out.
1792 */
1793 if (enable && !(ctrl & SDHCI_CTRL_PRESET_VAL_ENABLE)) {
1794 ctrl |= SDHCI_CTRL_PRESET_VAL_ENABLE;
1795 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1796 } else if (!enable && (ctrl & SDHCI_CTRL_PRESET_VAL_ENABLE)) {
1797 ctrl &= ~SDHCI_CTRL_PRESET_VAL_ENABLE;
1798 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1799 }
1800
1801 spin_unlock_irqrestore(&host->lock, flags);
1802}
1803
1804static const struct mmc_host_ops sdhci_ops = {
1805 .request = sdhci_request,
1806 .set_ios = sdhci_set_ios,
1807 .get_ro = sdhci_get_ro,
1808 .enable_sdio_irq = sdhci_enable_sdio_irq,
1809 .start_signal_voltage_switch = sdhci_start_signal_voltage_switch,
1810 .execute_tuning = sdhci_execute_tuning,
1811 .enable_preset_value = sdhci_enable_preset_value,
1812};
1813
1814/*****************************************************************************\
1815 * *
1816 * Tasklets *
1817 * *
1818\*****************************************************************************/
1819
1820static void sdhci_tasklet_card(unsigned long param)
1821{
1822 struct sdhci_host *host;
1823 unsigned long flags;
1824
1825 host = (struct sdhci_host*)param;
1826
1827 spin_lock_irqsave(&host->lock, flags);
1828
1829 if (!(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT)) {
1830 if (host->mrq) {
1831 printk(KERN_ERR "%s: Card removed during transfer!\n",
1832 mmc_hostname(host->mmc));
1833 printk(KERN_ERR "%s: Resetting controller.\n",
1834 mmc_hostname(host->mmc));
1835
1836 sdhci_reset(host, SDHCI_RESET_CMD);
1837 sdhci_reset(host, SDHCI_RESET_DATA);
1838
1839 host->mrq->cmd->error = -ENOMEDIUM;
1840 tasklet_schedule(&host->finish_tasklet);
1841 }
1842 }
1843
1844 spin_unlock_irqrestore(&host->lock, flags);
1845
1846 mmc_detect_change(host->mmc, msecs_to_jiffies(200));
1847}
1848
1849static void sdhci_tasklet_finish(unsigned long param)
1850{
1851 struct sdhci_host *host;
1852 unsigned long flags;
1853 struct mmc_request *mrq;
1854
1855 host = (struct sdhci_host*)param;
1856
1857 /*
1858 * If this tasklet gets rescheduled while running, it will
1859 * be run again afterwards but without any active request.
1860 */
1861 if (!host->mrq)
1862 return;
1863
1864 spin_lock_irqsave(&host->lock, flags);
1865
1866 del_timer(&host->timer);
1867
1868 mrq = host->mrq;
1869
1870 /*
1871 * The controller needs a reset of internal state machines
1872 * upon error conditions.
1873 */
1874 if (!(host->flags & SDHCI_DEVICE_DEAD) &&
1875 ((mrq->cmd && mrq->cmd->error) ||
1876 (mrq->data && (mrq->data->error ||
1877 (mrq->data->stop && mrq->data->stop->error))) ||
1878 (host->quirks & SDHCI_QUIRK_RESET_AFTER_REQUEST))) {
1879
1880 /* Some controllers need this kick or reset won't work here */
1881 if (host->quirks & SDHCI_QUIRK_CLOCK_BEFORE_RESET) {
1882 unsigned int clock;
1883
1884 /* This is to force an update */
1885 clock = host->clock;
1886 host->clock = 0;
1887 sdhci_set_clock(host, clock);
1888 }
1889
1890 /* Spec says we should do both at the same time, but Ricoh
1891 controllers do not like that. */
1892 sdhci_reset(host, SDHCI_RESET_CMD);
1893 sdhci_reset(host, SDHCI_RESET_DATA);
1894 }
1895
1896 host->mrq = NULL;
1897 host->cmd = NULL;
1898 host->data = NULL;
1899
1900#ifndef SDHCI_USE_LEDS_CLASS
1901 sdhci_deactivate_led(host);
1902#endif
1903
1904 mmiowb();
1905 spin_unlock_irqrestore(&host->lock, flags);
1906
1907 mmc_request_done(host->mmc, mrq);
1908}
1909
1910static void sdhci_timeout_timer(unsigned long data)
1911{
1912 struct sdhci_host *host;
1913 unsigned long flags;
1914
1915 host = (struct sdhci_host*)data;
1916
1917 spin_lock_irqsave(&host->lock, flags);
1918
1919 if (host->mrq) {
1920 printk(KERN_ERR "%s: Timeout waiting for hardware "
1921 "interrupt.\n", mmc_hostname(host->mmc));
1922 sdhci_dumpregs(host);
1923
1924 if (host->data) {
1925 host->data->error = -ETIMEDOUT;
1926 sdhci_finish_data(host);
1927 } else {
1928 if (host->cmd)
1929 host->cmd->error = -ETIMEDOUT;
1930 else
1931 host->mrq->cmd->error = -ETIMEDOUT;
1932
1933 tasklet_schedule(&host->finish_tasklet);
1934 }
1935 }
1936
1937 mmiowb();
1938 spin_unlock_irqrestore(&host->lock, flags);
1939}
1940
1941static void sdhci_tuning_timer(unsigned long data)
1942{
1943 struct sdhci_host *host;
1944 unsigned long flags;
1945
1946 host = (struct sdhci_host *)data;
1947
1948 spin_lock_irqsave(&host->lock, flags);
1949
1950 host->flags |= SDHCI_NEEDS_RETUNING;
1951
1952 spin_unlock_irqrestore(&host->lock, flags);
1953}
1954
1955/*****************************************************************************\
1956 * *
1957 * Interrupt handling *
1958 * *
1959\*****************************************************************************/
1960
1961static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask)
1962{
1963 BUG_ON(intmask == 0);
1964
1965 if (!host->cmd) {
1966 printk(KERN_ERR "%s: Got command interrupt 0x%08x even "
1967 "though no command operation was in progress.\n",
1968 mmc_hostname(host->mmc), (unsigned)intmask);
1969 sdhci_dumpregs(host);
1970 return;
1971 }
1972
1973 if (intmask & SDHCI_INT_TIMEOUT)
1974 host->cmd->error = -ETIMEDOUT;
1975 else if (intmask & (SDHCI_INT_CRC | SDHCI_INT_END_BIT |
1976 SDHCI_INT_INDEX))
1977 host->cmd->error = -EILSEQ;
1978
1979 if (host->cmd->error) {
1980 tasklet_schedule(&host->finish_tasklet);
1981 return;
1982 }
1983
1984 /*
1985 * The host can send and interrupt when the busy state has
1986 * ended, allowing us to wait without wasting CPU cycles.
1987 * Unfortunately this is overloaded on the "data complete"
1988 * interrupt, so we need to take some care when handling
1989 * it.
1990 *
1991 * Note: The 1.0 specification is a bit ambiguous about this
1992 * feature so there might be some problems with older
1993 * controllers.
1994 */
1995 if (host->cmd->flags & MMC_RSP_BUSY) {
1996 if (host->cmd->data)
1997 DBG("Cannot wait for busy signal when also "
1998 "doing a data transfer");
1999 else if (!(host->quirks & SDHCI_QUIRK_NO_BUSY_IRQ))
2000 return;
2001
2002 /* The controller does not support the end-of-busy IRQ,
2003 * fall through and take the SDHCI_INT_RESPONSE */
2004 }
2005
2006 if (intmask & SDHCI_INT_RESPONSE)
2007 sdhci_finish_command(host);
2008}
2009
2010#ifdef CONFIG_MMC_DEBUG
2011static void sdhci_show_adma_error(struct sdhci_host *host)
2012{
2013 const char *name = mmc_hostname(host->mmc);
2014 u8 *desc = host->adma_desc;
2015 __le32 *dma;
2016 __le16 *len;
2017 u8 attr;
2018
2019 sdhci_dumpregs(host);
2020
2021 while (true) {
2022 dma = (__le32 *)(desc + 4);
2023 len = (__le16 *)(desc + 2);
2024 attr = *desc;
2025
2026 DBG("%s: %p: DMA 0x%08x, LEN 0x%04x, Attr=0x%02x\n",
2027 name, desc, le32_to_cpu(*dma), le16_to_cpu(*len), attr);
2028
2029 desc += 8;
2030
2031 if (attr & 2)
2032 break;
2033 }
2034}
2035#else
2036static void sdhci_show_adma_error(struct sdhci_host *host) { }
2037#endif
2038
2039static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
2040{
2041 BUG_ON(intmask == 0);
2042
2043 /* CMD19 generates _only_ Buffer Read Ready interrupt */
2044 if (intmask & SDHCI_INT_DATA_AVAIL) {
2045 if (SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND)) ==
2046 MMC_SEND_TUNING_BLOCK) {
2047 host->tuning_done = 1;
2048 wake_up(&host->buf_ready_int);
2049 return;
2050 }
2051 }
2052
2053 if (!host->data) {
2054 /*
2055 * The "data complete" interrupt is also used to
2056 * indicate that a busy state has ended. See comment
2057 * above in sdhci_cmd_irq().
2058 */
2059 if (host->cmd && (host->cmd->flags & MMC_RSP_BUSY)) {
2060 if (intmask & SDHCI_INT_DATA_END) {
2061 sdhci_finish_command(host);
2062 return;
2063 }
2064 }
2065
2066 printk(KERN_ERR "%s: Got data interrupt 0x%08x even "
2067 "though no data operation was in progress.\n",
2068 mmc_hostname(host->mmc), (unsigned)intmask);
2069 sdhci_dumpregs(host);
2070
2071 return;
2072 }
2073
2074 if (intmask & SDHCI_INT_DATA_TIMEOUT)
2075 host->data->error = -ETIMEDOUT;
2076 else if (intmask & SDHCI_INT_DATA_END_BIT)
2077 host->data->error = -EILSEQ;
2078 else if ((intmask & SDHCI_INT_DATA_CRC) &&
2079 SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND))
2080 != MMC_BUS_TEST_R)
2081 host->data->error = -EILSEQ;
2082 else if (intmask & SDHCI_INT_ADMA_ERROR) {
2083 printk(KERN_ERR "%s: ADMA error\n", mmc_hostname(host->mmc));
2084 sdhci_show_adma_error(host);
2085 host->data->error = -EIO;
2086 }
2087
2088 if (host->data->error)
2089 sdhci_finish_data(host);
2090 else {
2091 if (intmask & (SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL))
2092 sdhci_transfer_pio(host);
2093
2094 /*
2095 * We currently don't do anything fancy with DMA
2096 * boundaries, but as we can't disable the feature
2097 * we need to at least restart the transfer.
2098 *
2099 * According to the spec sdhci_readl(host, SDHCI_DMA_ADDRESS)
2100 * should return a valid address to continue from, but as
2101 * some controllers are faulty, don't trust them.
2102 */
2103 if (intmask & SDHCI_INT_DMA_END) {
2104 u32 dmastart, dmanow;
2105 dmastart = sg_dma_address(host->data->sg);
2106 dmanow = dmastart + host->data->bytes_xfered;
2107 /*
2108 * Force update to the next DMA block boundary.
2109 */
2110 dmanow = (dmanow &
2111 ~(SDHCI_DEFAULT_BOUNDARY_SIZE - 1)) +
2112 SDHCI_DEFAULT_BOUNDARY_SIZE;
2113 host->data->bytes_xfered = dmanow - dmastart;
2114 DBG("%s: DMA base 0x%08x, transferred 0x%06x bytes,"
2115 " next 0x%08x\n",
2116 mmc_hostname(host->mmc), dmastart,
2117 host->data->bytes_xfered, dmanow);
2118 sdhci_writel(host, dmanow, SDHCI_DMA_ADDRESS);
2119 }
2120
2121 if (intmask & SDHCI_INT_DATA_END) {
2122 if (host->cmd) {
2123 /*
2124 * Data managed to finish before the
2125 * command completed. Make sure we do
2126 * things in the proper order.
2127 */
2128 host->data_early = 1;
2129 } else {
2130 sdhci_finish_data(host);
2131 }
2132 }
2133 }
2134}
2135
2136static irqreturn_t sdhci_irq(int irq, void *dev_id)
2137{
2138 irqreturn_t result;
2139 struct sdhci_host* host = dev_id;
2140 u32 intmask;
2141 int cardint = 0;
2142
2143 spin_lock(&host->lock);
2144
2145 intmask = sdhci_readl(host, SDHCI_INT_STATUS);
2146
2147 if (!intmask || intmask == 0xffffffff) {
2148 result = IRQ_NONE;
2149 goto out;
2150 }
2151
2152 DBG("*** %s got interrupt: 0x%08x\n",
2153 mmc_hostname(host->mmc), intmask);
2154
2155 if (intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
2156 u32 present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
2157 SDHCI_CARD_PRESENT;
2158
2159 /*
2160 * There is a observation on i.mx esdhc. INSERT bit will be
2161 * immediately set again when it gets cleared, if a card is
2162 * inserted. We have to mask the irq to prevent interrupt
2163 * storm which will freeze the system. And the REMOVE gets
2164 * the same situation.
2165 *
2166 * More testing are needed here to ensure it works for other
2167 * platforms though.
2168 */
2169 sdhci_mask_irqs(host, present ? SDHCI_INT_CARD_INSERT :
2170 SDHCI_INT_CARD_REMOVE);
2171 sdhci_unmask_irqs(host, present ? SDHCI_INT_CARD_REMOVE :
2172 SDHCI_INT_CARD_INSERT);
2173
2174 sdhci_writel(host, intmask & (SDHCI_INT_CARD_INSERT |
2175 SDHCI_INT_CARD_REMOVE), SDHCI_INT_STATUS);
2176 intmask &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE);
2177 tasklet_schedule(&host->card_tasklet);
2178 }
2179
2180 if (intmask & SDHCI_INT_CMD_MASK) {
2181 sdhci_writel(host, intmask & SDHCI_INT_CMD_MASK,
2182 SDHCI_INT_STATUS);
2183 sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK);
2184 }
2185
2186 if (intmask & SDHCI_INT_DATA_MASK) {
2187 sdhci_writel(host, intmask & SDHCI_INT_DATA_MASK,
2188 SDHCI_INT_STATUS);
2189 sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK);
2190 }
2191
2192 intmask &= ~(SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK);
2193
2194 intmask &= ~SDHCI_INT_ERROR;
2195
2196 if (intmask & SDHCI_INT_BUS_POWER) {
2197 printk(KERN_ERR "%s: Card is consuming too much power!\n",
2198 mmc_hostname(host->mmc));
2199 sdhci_writel(host, SDHCI_INT_BUS_POWER, SDHCI_INT_STATUS);
2200 }
2201
2202 intmask &= ~SDHCI_INT_BUS_POWER;
2203
2204 if (intmask & SDHCI_INT_CARD_INT)
2205 cardint = 1;
2206
2207 intmask &= ~SDHCI_INT_CARD_INT;
2208
2209 if (intmask) {
2210 printk(KERN_ERR "%s: Unexpected interrupt 0x%08x.\n",
2211 mmc_hostname(host->mmc), intmask);
2212 sdhci_dumpregs(host);
2213
2214 sdhci_writel(host, intmask, SDHCI_INT_STATUS);
2215 }
2216
2217 result = IRQ_HANDLED;
2218
2219 mmiowb();
2220out:
2221 spin_unlock(&host->lock);
2222
2223 /*
2224 * We have to delay this as it calls back into the driver.
2225 */
2226 if (cardint)
2227 mmc_signal_sdio_irq(host->mmc);
2228
2229 return result;
2230}
2231
2232/*****************************************************************************\
2233 * *
2234 * Suspend/resume *
2235 * *
2236\*****************************************************************************/
2237
2238#ifdef CONFIG_PM
2239
2240int sdhci_suspend_host(struct sdhci_host *host, pm_message_t state)
2241{
2242 int ret;
2243
2244 sdhci_disable_card_detection(host);
2245
2246 /* Disable tuning since we are suspending */
2247 if (host->version >= SDHCI_SPEC_300 && host->tuning_count &&
2248 host->tuning_mode == SDHCI_TUNING_MODE_1) {
2249 host->flags &= ~SDHCI_NEEDS_RETUNING;
2250 mod_timer(&host->tuning_timer, jiffies +
2251 host->tuning_count * HZ);
2252 }
2253
2254 ret = mmc_suspend_host(host->mmc);
2255 if (ret)
2256 return ret;
2257
2258 free_irq(host->irq, host);
2259
2260 if (host->vmmc)
2261 ret = regulator_disable(host->vmmc);
2262
2263 return ret;
2264}
2265
2266EXPORT_SYMBOL_GPL(sdhci_suspend_host);
2267
2268int sdhci_resume_host(struct sdhci_host *host)
2269{
2270 int ret;
2271
2272 if (host->vmmc) {
2273 int ret = regulator_enable(host->vmmc);
2274 if (ret)
2275 return ret;
2276 }
2277
2278
2279 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
2280 if (host->ops->enable_dma)
2281 host->ops->enable_dma(host);
2282 }
2283
2284 ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED,
2285 mmc_hostname(host->mmc), host);
2286 if (ret)
2287 return ret;
2288
2289 sdhci_init(host, (host->mmc->pm_flags & MMC_PM_KEEP_POWER));
2290 mmiowb();
2291
2292 ret = mmc_resume_host(host->mmc);
2293 sdhci_enable_card_detection(host);
2294
2295 /* Set the re-tuning expiration flag */
2296 if ((host->version >= SDHCI_SPEC_300) && host->tuning_count &&
2297 (host->tuning_mode == SDHCI_TUNING_MODE_1))
2298 host->flags |= SDHCI_NEEDS_RETUNING;
2299
2300 return ret;
2301}
2302
2303EXPORT_SYMBOL_GPL(sdhci_resume_host);
2304
2305void sdhci_enable_irq_wakeups(struct sdhci_host *host)
2306{
2307 u8 val;
2308 val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
2309 val |= SDHCI_WAKE_ON_INT;
2310 sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
2311}
2312
2313EXPORT_SYMBOL_GPL(sdhci_enable_irq_wakeups);
2314
2315#endif /* CONFIG_PM */
2316
2317/*****************************************************************************\
2318 * *
2319 * Device allocation/registration *
2320 * *
2321\*****************************************************************************/
2322
2323struct sdhci_host *sdhci_alloc_host(struct device *dev,
2324 size_t priv_size)
2325{
2326 struct mmc_host *mmc;
2327 struct sdhci_host *host;
2328
2329 WARN_ON(dev == NULL);
2330
2331 mmc = mmc_alloc_host(sizeof(struct sdhci_host) + priv_size, dev);
2332 if (!mmc)
2333 return ERR_PTR(-ENOMEM);
2334
2335 host = mmc_priv(mmc);
2336 host->mmc = mmc;
2337
2338 return host;
2339}
2340
2341EXPORT_SYMBOL_GPL(sdhci_alloc_host);
2342
2343int sdhci_add_host(struct sdhci_host *host)
2344{
2345 struct mmc_host *mmc;
2346 u32 caps[2];
2347 u32 max_current_caps;
2348 unsigned int ocr_avail;
2349 int ret;
2350
2351 WARN_ON(host == NULL);
2352 if (host == NULL)
2353 return -EINVAL;
2354
2355 mmc = host->mmc;
2356
2357 if (debug_quirks)
2358 host->quirks = debug_quirks;
2359
2360 sdhci_reset(host, SDHCI_RESET_ALL);
2361
2362 host->version = sdhci_readw(host, SDHCI_HOST_VERSION);
2363 host->version = (host->version & SDHCI_SPEC_VER_MASK)
2364 >> SDHCI_SPEC_VER_SHIFT;
2365 if (host->version > SDHCI_SPEC_300) {
2366 printk(KERN_ERR "%s: Unknown controller version (%d). "
2367 "You may experience problems.\n", mmc_hostname(mmc),
2368 host->version);
2369 }
2370
2371 caps[0] = (host->quirks & SDHCI_QUIRK_MISSING_CAPS) ? host->caps :
2372 sdhci_readl(host, SDHCI_CAPABILITIES);
2373
2374 caps[1] = (host->version >= SDHCI_SPEC_300) ?
2375 sdhci_readl(host, SDHCI_CAPABILITIES_1) : 0;
2376
2377 if (host->quirks & SDHCI_QUIRK_FORCE_DMA)
2378 host->flags |= SDHCI_USE_SDMA;
2379 else if (!(caps[0] & SDHCI_CAN_DO_SDMA))
2380 DBG("Controller doesn't have SDMA capability\n");
2381 else
2382 host->flags |= SDHCI_USE_SDMA;
2383
2384 if ((host->quirks & SDHCI_QUIRK_BROKEN_DMA) &&
2385 (host->flags & SDHCI_USE_SDMA)) {
2386 DBG("Disabling DMA as it is marked broken\n");
2387 host->flags &= ~SDHCI_USE_SDMA;
2388 }
2389
2390 if ((host->version >= SDHCI_SPEC_200) &&
2391 (caps[0] & SDHCI_CAN_DO_ADMA2))
2392 host->flags |= SDHCI_USE_ADMA;
2393
2394 if ((host->quirks & SDHCI_QUIRK_BROKEN_ADMA) &&
2395 (host->flags & SDHCI_USE_ADMA)) {
2396 DBG("Disabling ADMA as it is marked broken\n");
2397 host->flags &= ~SDHCI_USE_ADMA;
2398 }
2399
2400 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
2401 if (host->ops->enable_dma) {
2402 if (host->ops->enable_dma(host)) {
2403 printk(KERN_WARNING "%s: No suitable DMA "
2404 "available. Falling back to PIO.\n",
2405 mmc_hostname(mmc));
2406 host->flags &=
2407 ~(SDHCI_USE_SDMA | SDHCI_USE_ADMA);
2408 }
2409 }
2410 }
2411
2412 if (host->flags & SDHCI_USE_ADMA) {
2413 /*
2414 * We need to allocate descriptors for all sg entries
2415 * (128) and potentially one alignment transfer for
2416 * each of those entries.
2417 */
2418 host->adma_desc = kmalloc((128 * 2 + 1) * 4, GFP_KERNEL);
2419 host->align_buffer = kmalloc(128 * 4, GFP_KERNEL);
2420 if (!host->adma_desc || !host->align_buffer) {
2421 kfree(host->adma_desc);
2422 kfree(host->align_buffer);
2423 printk(KERN_WARNING "%s: Unable to allocate ADMA "
2424 "buffers. Falling back to standard DMA.\n",
2425 mmc_hostname(mmc));
2426 host->flags &= ~SDHCI_USE_ADMA;
2427 }
2428 }
2429
2430 /*
2431 * If we use DMA, then it's up to the caller to set the DMA
2432 * mask, but PIO does not need the hw shim so we set a new
2433 * mask here in that case.
2434 */
2435 if (!(host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA))) {
2436 host->dma_mask = DMA_BIT_MASK(64);
2437 mmc_dev(host->mmc)->dma_mask = &host->dma_mask;
2438 }
2439
2440 if (host->version >= SDHCI_SPEC_300)
2441 host->max_clk = (caps[0] & SDHCI_CLOCK_V3_BASE_MASK)
2442 >> SDHCI_CLOCK_BASE_SHIFT;
2443 else
2444 host->max_clk = (caps[0] & SDHCI_CLOCK_BASE_MASK)
2445 >> SDHCI_CLOCK_BASE_SHIFT;
2446
2447 host->max_clk *= 1000000;
2448 if (host->max_clk == 0 || host->quirks &
2449 SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN) {
2450 if (!host->ops->get_max_clock) {
2451 printk(KERN_ERR
2452 "%s: Hardware doesn't specify base clock "
2453 "frequency.\n", mmc_hostname(mmc));
2454 return -ENODEV;
2455 }
2456 host->max_clk = host->ops->get_max_clock(host);
2457 }
2458
2459 /*
2460 * In case of Host Controller v3.00, find out whether clock
2461 * multiplier is supported.
2462 */
2463 host->clk_mul = (caps[1] & SDHCI_CLOCK_MUL_MASK) >>
2464 SDHCI_CLOCK_MUL_SHIFT;
2465
2466 /*
2467 * In case the value in Clock Multiplier is 0, then programmable
2468 * clock mode is not supported, otherwise the actual clock
2469 * multiplier is one more than the value of Clock Multiplier
2470 * in the Capabilities Register.
2471 */
2472 if (host->clk_mul)
2473 host->clk_mul += 1;
2474
2475 /*
2476 * Set host parameters.
2477 */
2478 mmc->ops = &sdhci_ops;
2479 mmc->f_max = host->max_clk;
2480 if (host->ops->get_min_clock)
2481 mmc->f_min = host->ops->get_min_clock(host);
2482 else if (host->version >= SDHCI_SPEC_300) {
2483 if (host->clk_mul) {
2484 mmc->f_min = (host->max_clk * host->clk_mul) / 1024;
2485 mmc->f_max = host->max_clk * host->clk_mul;
2486 } else
2487 mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_300;
2488 } else
2489 mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_200;
2490
2491 host->timeout_clk =
2492 (caps[0] & SDHCI_TIMEOUT_CLK_MASK) >> SDHCI_TIMEOUT_CLK_SHIFT;
2493 if (host->timeout_clk == 0) {
2494 if (host->ops->get_timeout_clock) {
2495 host->timeout_clk = host->ops->get_timeout_clock(host);
2496 } else if (!(host->quirks &
2497 SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK)) {
2498 printk(KERN_ERR
2499 "%s: Hardware doesn't specify timeout clock "
2500 "frequency.\n", mmc_hostname(mmc));
2501 return -ENODEV;
2502 }
2503 }
2504 if (caps[0] & SDHCI_TIMEOUT_CLK_UNIT)
2505 host->timeout_clk *= 1000;
2506
2507 if (host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK)
2508 host->timeout_clk = mmc->f_max / 1000;
2509
2510 mmc->max_discard_to = (1 << 27) / host->timeout_clk;
2511
2512 mmc->caps |= MMC_CAP_SDIO_IRQ | MMC_CAP_ERASE | MMC_CAP_CMD23;
2513
2514 if (host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12)
2515 host->flags |= SDHCI_AUTO_CMD12;
2516
2517 /* Auto-CMD23 stuff only works in ADMA or PIO. */
2518 if ((host->version >= SDHCI_SPEC_300) &&
2519 ((host->flags & SDHCI_USE_ADMA) ||
2520 !(host->flags & SDHCI_USE_SDMA))) {
2521 host->flags |= SDHCI_AUTO_CMD23;
2522 DBG("%s: Auto-CMD23 available\n", mmc_hostname(mmc));
2523 } else {
2524 DBG("%s: Auto-CMD23 unavailable\n", mmc_hostname(mmc));
2525 }
2526
2527 /*
2528 * A controller may support 8-bit width, but the board itself
2529 * might not have the pins brought out. Boards that support
2530 * 8-bit width must set "mmc->caps |= MMC_CAP_8_BIT_DATA;" in
2531 * their platform code before calling sdhci_add_host(), and we
2532 * won't assume 8-bit width for hosts without that CAP.
2533 */
2534 if (!(host->quirks & SDHCI_QUIRK_FORCE_1_BIT_DATA))
2535 mmc->caps |= MMC_CAP_4_BIT_DATA;
2536
2537 if (caps[0] & SDHCI_CAN_DO_HISPD)
2538 mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
2539
2540 if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) &&
2541 mmc_card_is_removable(mmc))
2542 mmc->caps |= MMC_CAP_NEEDS_POLL;
2543
2544 /* UHS-I mode(s) supported by the host controller. */
2545 if (host->version >= SDHCI_SPEC_300)
2546 mmc->caps |= MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25;
2547
2548 /* SDR104 supports also implies SDR50 support */
2549 if (caps[1] & SDHCI_SUPPORT_SDR104)
2550 mmc->caps |= MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_SDR50;
2551 else if (caps[1] & SDHCI_SUPPORT_SDR50)
2552 mmc->caps |= MMC_CAP_UHS_SDR50;
2553
2554 if (caps[1] & SDHCI_SUPPORT_DDR50)
2555 mmc->caps |= MMC_CAP_UHS_DDR50;
2556
2557 /* Does the host needs tuning for SDR50? */
2558 if (caps[1] & SDHCI_USE_SDR50_TUNING)
2559 host->flags |= SDHCI_SDR50_NEEDS_TUNING;
2560
2561 /* Driver Type(s) (A, C, D) supported by the host */
2562 if (caps[1] & SDHCI_DRIVER_TYPE_A)
2563 mmc->caps |= MMC_CAP_DRIVER_TYPE_A;
2564 if (caps[1] & SDHCI_DRIVER_TYPE_C)
2565 mmc->caps |= MMC_CAP_DRIVER_TYPE_C;
2566 if (caps[1] & SDHCI_DRIVER_TYPE_D)
2567 mmc->caps |= MMC_CAP_DRIVER_TYPE_D;
2568
2569 /* Initial value for re-tuning timer count */
2570 host->tuning_count = (caps[1] & SDHCI_RETUNING_TIMER_COUNT_MASK) >>
2571 SDHCI_RETUNING_TIMER_COUNT_SHIFT;
2572
2573 /*
2574 * In case Re-tuning Timer is not disabled, the actual value of
2575 * re-tuning timer will be 2 ^ (n - 1).
2576 */
2577 if (host->tuning_count)
2578 host->tuning_count = 1 << (host->tuning_count - 1);
2579
2580 /* Re-tuning mode supported by the Host Controller */
2581 host->tuning_mode = (caps[1] & SDHCI_RETUNING_MODE_MASK) >>
2582 SDHCI_RETUNING_MODE_SHIFT;
2583
2584 ocr_avail = 0;
2585 /*
2586 * According to SD Host Controller spec v3.00, if the Host System
2587 * can afford more than 150mA, Host Driver should set XPC to 1. Also
2588 * the value is meaningful only if Voltage Support in the Capabilities
2589 * register is set. The actual current value is 4 times the register
2590 * value.
2591 */
2592 max_current_caps = sdhci_readl(host, SDHCI_MAX_CURRENT);
2593
2594 if (caps[0] & SDHCI_CAN_VDD_330) {
2595 int max_current_330;
2596
2597 ocr_avail |= MMC_VDD_32_33 | MMC_VDD_33_34;
2598
2599 max_current_330 = ((max_current_caps &
2600 SDHCI_MAX_CURRENT_330_MASK) >>
2601 SDHCI_MAX_CURRENT_330_SHIFT) *
2602 SDHCI_MAX_CURRENT_MULTIPLIER;
2603
2604 if (max_current_330 > 150)
2605 mmc->caps |= MMC_CAP_SET_XPC_330;
2606 }
2607 if (caps[0] & SDHCI_CAN_VDD_300) {
2608 int max_current_300;
2609
2610 ocr_avail |= MMC_VDD_29_30 | MMC_VDD_30_31;
2611
2612 max_current_300 = ((max_current_caps &
2613 SDHCI_MAX_CURRENT_300_MASK) >>
2614 SDHCI_MAX_CURRENT_300_SHIFT) *
2615 SDHCI_MAX_CURRENT_MULTIPLIER;
2616
2617 if (max_current_300 > 150)
2618 mmc->caps |= MMC_CAP_SET_XPC_300;
2619 }
2620 if (caps[0] & SDHCI_CAN_VDD_180) {
2621 int max_current_180;
2622
2623 ocr_avail |= MMC_VDD_165_195;
2624
2625 max_current_180 = ((max_current_caps &
2626 SDHCI_MAX_CURRENT_180_MASK) >>
2627 SDHCI_MAX_CURRENT_180_SHIFT) *
2628 SDHCI_MAX_CURRENT_MULTIPLIER;
2629
2630 if (max_current_180 > 150)
2631 mmc->caps |= MMC_CAP_SET_XPC_180;
2632
2633 /* Maximum current capabilities of the host at 1.8V */
2634 if (max_current_180 >= 800)
2635 mmc->caps |= MMC_CAP_MAX_CURRENT_800;
2636 else if (max_current_180 >= 600)
2637 mmc->caps |= MMC_CAP_MAX_CURRENT_600;
2638 else if (max_current_180 >= 400)
2639 mmc->caps |= MMC_CAP_MAX_CURRENT_400;
2640 else
2641 mmc->caps |= MMC_CAP_MAX_CURRENT_200;
2642 }
2643
2644 mmc->ocr_avail = ocr_avail;
2645 mmc->ocr_avail_sdio = ocr_avail;
2646 if (host->ocr_avail_sdio)
2647 mmc->ocr_avail_sdio &= host->ocr_avail_sdio;
2648 mmc->ocr_avail_sd = ocr_avail;
2649 if (host->ocr_avail_sd)
2650 mmc->ocr_avail_sd &= host->ocr_avail_sd;
2651 else /* normal SD controllers don't support 1.8V */
2652 mmc->ocr_avail_sd &= ~MMC_VDD_165_195;
2653 mmc->ocr_avail_mmc = ocr_avail;
2654 if (host->ocr_avail_mmc)
2655 mmc->ocr_avail_mmc &= host->ocr_avail_mmc;
2656
2657 if (mmc->ocr_avail == 0) {
2658 printk(KERN_ERR "%s: Hardware doesn't report any "
2659 "support voltages.\n", mmc_hostname(mmc));
2660 return -ENODEV;
2661 }
2662
2663 spin_lock_init(&host->lock);
2664
2665 /*
2666 * Maximum number of segments. Depends on if the hardware
2667 * can do scatter/gather or not.
2668 */
2669 if (host->flags & SDHCI_USE_ADMA)
2670 mmc->max_segs = 128;
2671 else if (host->flags & SDHCI_USE_SDMA)
2672 mmc->max_segs = 1;
2673 else /* PIO */
2674 mmc->max_segs = 128;
2675
2676 /*
2677 * Maximum number of sectors in one transfer. Limited by DMA boundary
2678 * size (512KiB).
2679 */
2680 mmc->max_req_size = 524288;
2681
2682 /*
2683 * Maximum segment size. Could be one segment with the maximum number
2684 * of bytes. When doing hardware scatter/gather, each entry cannot
2685 * be larger than 64 KiB though.
2686 */
2687 if (host->flags & SDHCI_USE_ADMA) {
2688 if (host->quirks & SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC)
2689 mmc->max_seg_size = 65535;
2690 else
2691 mmc->max_seg_size = 65536;
2692 } else {
2693 mmc->max_seg_size = mmc->max_req_size;
2694 }
2695
2696 /*
2697 * Maximum block size. This varies from controller to controller and
2698 * is specified in the capabilities register.
2699 */
2700 if (host->quirks & SDHCI_QUIRK_FORCE_BLK_SZ_2048) {
2701 mmc->max_blk_size = 2;
2702 } else {
2703 mmc->max_blk_size = (caps[0] & SDHCI_MAX_BLOCK_MASK) >>
2704 SDHCI_MAX_BLOCK_SHIFT;
2705 if (mmc->max_blk_size >= 3) {
2706 printk(KERN_WARNING "%s: Invalid maximum block size, "
2707 "assuming 512 bytes\n", mmc_hostname(mmc));
2708 mmc->max_blk_size = 0;
2709 }
2710 }
2711
2712 mmc->max_blk_size = 512 << mmc->max_blk_size;
2713
2714 /*
2715 * Maximum block count.
2716 */
2717 mmc->max_blk_count = (host->quirks & SDHCI_QUIRK_NO_MULTIBLOCK) ? 1 : 65535;
2718
2719 /*
2720 * Init tasklets.
2721 */
2722 tasklet_init(&host->card_tasklet,
2723 sdhci_tasklet_card, (unsigned long)host);
2724 tasklet_init(&host->finish_tasklet,
2725 sdhci_tasklet_finish, (unsigned long)host);
2726
2727 setup_timer(&host->timer, sdhci_timeout_timer, (unsigned long)host);
2728
2729 if (host->version >= SDHCI_SPEC_300) {
2730 init_waitqueue_head(&host->buf_ready_int);
2731
2732 /* Initialize re-tuning timer */
2733 init_timer(&host->tuning_timer);
2734 host->tuning_timer.data = (unsigned long)host;
2735 host->tuning_timer.function = sdhci_tuning_timer;
2736 }
2737
2738 ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED,
2739 mmc_hostname(mmc), host);
2740 if (ret)
2741 goto untasklet;
2742
2743 host->vmmc = regulator_get(mmc_dev(mmc), "vmmc");
2744 if (IS_ERR(host->vmmc)) {
2745 printk(KERN_INFO "%s: no vmmc regulator found\n", mmc_hostname(mmc));
2746 host->vmmc = NULL;
2747 } else {
2748 regulator_enable(host->vmmc);
2749 }
2750
2751 sdhci_init(host, 0);
2752
2753#ifdef CONFIG_MMC_DEBUG
2754 sdhci_dumpregs(host);
2755#endif
2756
2757#ifdef SDHCI_USE_LEDS_CLASS
2758 snprintf(host->led_name, sizeof(host->led_name),
2759 "%s::", mmc_hostname(mmc));
2760 host->led.name = host->led_name;
2761 host->led.brightness = LED_OFF;
2762 host->led.default_trigger = mmc_hostname(mmc);
2763 host->led.brightness_set = sdhci_led_control;
2764
2765 ret = led_classdev_register(mmc_dev(mmc), &host->led);
2766 if (ret)
2767 goto reset;
2768#endif
2769
2770 mmiowb();
2771
2772 mmc_add_host(mmc);
2773
2774 printk(KERN_INFO "%s: SDHCI controller on %s [%s] using %s\n",
2775 mmc_hostname(mmc), host->hw_name, dev_name(mmc_dev(mmc)),
2776 (host->flags & SDHCI_USE_ADMA) ? "ADMA" :
2777 (host->flags & SDHCI_USE_SDMA) ? "DMA" : "PIO");
2778
2779 sdhci_enable_card_detection(host);
2780
2781 return 0;
2782
2783#ifdef SDHCI_USE_LEDS_CLASS
2784reset:
2785 sdhci_reset(host, SDHCI_RESET_ALL);
2786 free_irq(host->irq, host);
2787#endif
2788untasklet:
2789 tasklet_kill(&host->card_tasklet);
2790 tasklet_kill(&host->finish_tasklet);
2791
2792 return ret;
2793}
2794
2795EXPORT_SYMBOL_GPL(sdhci_add_host);
2796
2797void sdhci_remove_host(struct sdhci_host *host, int dead)
2798{
2799 unsigned long flags;
2800
2801 if (dead) {
2802 spin_lock_irqsave(&host->lock, flags);
2803
2804 host->flags |= SDHCI_DEVICE_DEAD;
2805
2806 if (host->mrq) {
2807 printk(KERN_ERR "%s: Controller removed during "
2808 " transfer!\n", mmc_hostname(host->mmc));
2809
2810 host->mrq->cmd->error = -ENOMEDIUM;
2811 tasklet_schedule(&host->finish_tasklet);
2812 }
2813
2814 spin_unlock_irqrestore(&host->lock, flags);
2815 }
2816
2817 sdhci_disable_card_detection(host);
2818
2819 mmc_remove_host(host->mmc);
2820
2821#ifdef SDHCI_USE_LEDS_CLASS
2822 led_classdev_unregister(&host->led);
2823#endif
2824
2825 if (!dead)
2826 sdhci_reset(host, SDHCI_RESET_ALL);
2827
2828 free_irq(host->irq, host);
2829
2830 del_timer_sync(&host->timer);
2831 if (host->version >= SDHCI_SPEC_300)
2832 del_timer_sync(&host->tuning_timer);
2833
2834 tasklet_kill(&host->card_tasklet);
2835 tasklet_kill(&host->finish_tasklet);
2836
2837 if (host->vmmc) {
2838 regulator_disable(host->vmmc);
2839 regulator_put(host->vmmc);
2840 }
2841
2842 kfree(host->adma_desc);
2843 kfree(host->align_buffer);
2844
2845 host->adma_desc = NULL;
2846 host->align_buffer = NULL;
2847}
2848
2849EXPORT_SYMBOL_GPL(sdhci_remove_host);
2850
2851void sdhci_free_host(struct sdhci_host *host)
2852{
2853 mmc_free_host(host->mmc);
2854}
2855
2856EXPORT_SYMBOL_GPL(sdhci_free_host);
2857
2858/*****************************************************************************\
2859 * *
2860 * Driver init/exit *
2861 * *
2862\*****************************************************************************/
2863
2864static int __init sdhci_drv_init(void)
2865{
2866 printk(KERN_INFO DRIVER_NAME
2867 ": Secure Digital Host Controller Interface driver\n");
2868 printk(KERN_INFO DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
2869
2870 return 0;
2871}
2872
2873static void __exit sdhci_drv_exit(void)
2874{
2875}
2876
2877module_init(sdhci_drv_init);
2878module_exit(sdhci_drv_exit);
2879
2880module_param(debug_quirks, uint, 0444);
2881
2882MODULE_AUTHOR("Pierre Ossman <pierre@ossman.eu>");
2883MODULE_DESCRIPTION("Secure Digital Host Controller Interface core driver");
2884MODULE_LICENSE("GPL");
2885
2886MODULE_PARM_DESC(debug_quirks, "Force certain quirks.");