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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/module.h>
20#include <linux/dma-mapping.h>
21#include <linux/slab.h>
22#include <linux/scatterlist.h>
23#include <linux/regulator/consumer.h>
24#include <linux/pm_runtime.h>
25
26#include <linux/leds.h>
27
28#include <linux/mmc/mmc.h>
29#include <linux/mmc/host.h>
30#include <linux/mmc/card.h>
31#include <linux/mmc/slot-gpio.h>
32
33#include "sdhci.h"
34
35#define DRIVER_NAME "sdhci"
36
37#define DBG(f, x...) \
38 pr_debug(DRIVER_NAME " [%s()]: " f, __func__,## x)
39
40#if defined(CONFIG_LEDS_CLASS) || (defined(CONFIG_LEDS_CLASS_MODULE) && \
41 defined(CONFIG_MMC_SDHCI_MODULE))
42#define SDHCI_USE_LEDS_CLASS
43#endif
44
45#define MAX_TUNING_LOOP 40
46
47static unsigned int debug_quirks = 0;
48static unsigned int debug_quirks2;
49
50static void sdhci_finish_data(struct sdhci_host *);
51
52static void sdhci_finish_command(struct sdhci_host *);
53static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode);
54static void sdhci_tuning_timer(unsigned long data);
55static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable);
56
57#ifdef CONFIG_PM_RUNTIME
58static int sdhci_runtime_pm_get(struct sdhci_host *host);
59static int sdhci_runtime_pm_put(struct sdhci_host *host);
60static void sdhci_runtime_pm_bus_on(struct sdhci_host *host);
61static void sdhci_runtime_pm_bus_off(struct sdhci_host *host);
62#else
63static inline int sdhci_runtime_pm_get(struct sdhci_host *host)
64{
65 return 0;
66}
67static inline int sdhci_runtime_pm_put(struct sdhci_host *host)
68{
69 return 0;
70}
71static void sdhci_runtime_pm_bus_on(struct sdhci_host *host)
72{
73}
74static void sdhci_runtime_pm_bus_off(struct sdhci_host *host)
75{
76}
77#endif
78
79static void sdhci_dumpregs(struct sdhci_host *host)
80{
81 pr_debug(DRIVER_NAME ": =========== REGISTER DUMP (%s)===========\n",
82 mmc_hostname(host->mmc));
83
84 pr_debug(DRIVER_NAME ": Sys addr: 0x%08x | Version: 0x%08x\n",
85 sdhci_readl(host, SDHCI_DMA_ADDRESS),
86 sdhci_readw(host, SDHCI_HOST_VERSION));
87 pr_debug(DRIVER_NAME ": Blk size: 0x%08x | Blk cnt: 0x%08x\n",
88 sdhci_readw(host, SDHCI_BLOCK_SIZE),
89 sdhci_readw(host, SDHCI_BLOCK_COUNT));
90 pr_debug(DRIVER_NAME ": Argument: 0x%08x | Trn mode: 0x%08x\n",
91 sdhci_readl(host, SDHCI_ARGUMENT),
92 sdhci_readw(host, SDHCI_TRANSFER_MODE));
93 pr_debug(DRIVER_NAME ": Present: 0x%08x | Host ctl: 0x%08x\n",
94 sdhci_readl(host, SDHCI_PRESENT_STATE),
95 sdhci_readb(host, SDHCI_HOST_CONTROL));
96 pr_debug(DRIVER_NAME ": Power: 0x%08x | Blk gap: 0x%08x\n",
97 sdhci_readb(host, SDHCI_POWER_CONTROL),
98 sdhci_readb(host, SDHCI_BLOCK_GAP_CONTROL));
99 pr_debug(DRIVER_NAME ": Wake-up: 0x%08x | Clock: 0x%08x\n",
100 sdhci_readb(host, SDHCI_WAKE_UP_CONTROL),
101 sdhci_readw(host, SDHCI_CLOCK_CONTROL));
102 pr_debug(DRIVER_NAME ": Timeout: 0x%08x | Int stat: 0x%08x\n",
103 sdhci_readb(host, SDHCI_TIMEOUT_CONTROL),
104 sdhci_readl(host, SDHCI_INT_STATUS));
105 pr_debug(DRIVER_NAME ": Int enab: 0x%08x | Sig enab: 0x%08x\n",
106 sdhci_readl(host, SDHCI_INT_ENABLE),
107 sdhci_readl(host, SDHCI_SIGNAL_ENABLE));
108 pr_debug(DRIVER_NAME ": AC12 err: 0x%08x | Slot int: 0x%08x\n",
109 sdhci_readw(host, SDHCI_ACMD12_ERR),
110 sdhci_readw(host, SDHCI_SLOT_INT_STATUS));
111 pr_debug(DRIVER_NAME ": Caps: 0x%08x | Caps_1: 0x%08x\n",
112 sdhci_readl(host, SDHCI_CAPABILITIES),
113 sdhci_readl(host, SDHCI_CAPABILITIES_1));
114 pr_debug(DRIVER_NAME ": Cmd: 0x%08x | Max curr: 0x%08x\n",
115 sdhci_readw(host, SDHCI_COMMAND),
116 sdhci_readl(host, SDHCI_MAX_CURRENT));
117 pr_debug(DRIVER_NAME ": Host ctl2: 0x%08x\n",
118 sdhci_readw(host, SDHCI_HOST_CONTROL2));
119
120 if (host->flags & SDHCI_USE_ADMA)
121 pr_debug(DRIVER_NAME ": ADMA Err: 0x%08x | ADMA Ptr: 0x%08x\n",
122 readl(host->ioaddr + SDHCI_ADMA_ERROR),
123 readl(host->ioaddr + SDHCI_ADMA_ADDRESS));
124
125 pr_debug(DRIVER_NAME ": ===========================================\n");
126}
127
128/*****************************************************************************\
129 * *
130 * Low level functions *
131 * *
132\*****************************************************************************/
133
134static void sdhci_clear_set_irqs(struct sdhci_host *host, u32 clear, u32 set)
135{
136 u32 ier;
137
138 ier = sdhci_readl(host, SDHCI_INT_ENABLE);
139 ier &= ~clear;
140 ier |= set;
141 sdhci_writel(host, ier, SDHCI_INT_ENABLE);
142 sdhci_writel(host, ier, SDHCI_SIGNAL_ENABLE);
143}
144
145static void sdhci_unmask_irqs(struct sdhci_host *host, u32 irqs)
146{
147 sdhci_clear_set_irqs(host, 0, irqs);
148}
149
150static void sdhci_mask_irqs(struct sdhci_host *host, u32 irqs)
151{
152 sdhci_clear_set_irqs(host, irqs, 0);
153}
154
155static void sdhci_set_card_detection(struct sdhci_host *host, bool enable)
156{
157 u32 present, irqs;
158
159 if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) ||
160 (host->mmc->caps & MMC_CAP_NONREMOVABLE))
161 return;
162
163 present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
164 SDHCI_CARD_PRESENT;
165 irqs = present ? SDHCI_INT_CARD_REMOVE : SDHCI_INT_CARD_INSERT;
166
167 if (enable)
168 sdhci_unmask_irqs(host, irqs);
169 else
170 sdhci_mask_irqs(host, irqs);
171}
172
173static void sdhci_enable_card_detection(struct sdhci_host *host)
174{
175 sdhci_set_card_detection(host, true);
176}
177
178static void sdhci_disable_card_detection(struct sdhci_host *host)
179{
180 sdhci_set_card_detection(host, false);
181}
182
183static void sdhci_reset(struct sdhci_host *host, u8 mask)
184{
185 unsigned long timeout;
186 u32 uninitialized_var(ier);
187
188 if (host->quirks & SDHCI_QUIRK_NO_CARD_NO_RESET) {
189 if (!(sdhci_readl(host, SDHCI_PRESENT_STATE) &
190 SDHCI_CARD_PRESENT))
191 return;
192 }
193
194 if (host->quirks & SDHCI_QUIRK_RESTORE_IRQS_AFTER_RESET)
195 ier = sdhci_readl(host, SDHCI_INT_ENABLE);
196
197 if (host->ops->platform_reset_enter)
198 host->ops->platform_reset_enter(host, mask);
199
200 sdhci_writeb(host, mask, SDHCI_SOFTWARE_RESET);
201
202 if (mask & SDHCI_RESET_ALL) {
203 host->clock = 0;
204 /* Reset-all turns off SD Bus Power */
205 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
206 sdhci_runtime_pm_bus_off(host);
207 }
208
209 /* Wait max 100 ms */
210 timeout = 100;
211
212 /* hw clears the bit when it's done */
213 while (sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask) {
214 if (timeout == 0) {
215 pr_err("%s: Reset 0x%x never completed.\n",
216 mmc_hostname(host->mmc), (int)mask);
217 sdhci_dumpregs(host);
218 return;
219 }
220 timeout--;
221 mdelay(1);
222 }
223
224 if (host->ops->platform_reset_exit)
225 host->ops->platform_reset_exit(host, mask);
226
227 if (host->quirks & SDHCI_QUIRK_RESTORE_IRQS_AFTER_RESET)
228 sdhci_clear_set_irqs(host, SDHCI_INT_ALL_MASK, ier);
229
230 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
231 if ((host->ops->enable_dma) && (mask & SDHCI_RESET_ALL))
232 host->ops->enable_dma(host);
233 }
234}
235
236static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios);
237
238static void sdhci_init(struct sdhci_host *host, int soft)
239{
240 if (soft)
241 sdhci_reset(host, SDHCI_RESET_CMD|SDHCI_RESET_DATA);
242 else
243 sdhci_reset(host, SDHCI_RESET_ALL);
244
245 sdhci_clear_set_irqs(host, SDHCI_INT_ALL_MASK,
246 SDHCI_INT_BUS_POWER | SDHCI_INT_DATA_END_BIT |
247 SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_TIMEOUT | SDHCI_INT_INDEX |
248 SDHCI_INT_END_BIT | SDHCI_INT_CRC | SDHCI_INT_TIMEOUT |
249 SDHCI_INT_DATA_END | SDHCI_INT_RESPONSE);
250
251 if (soft) {
252 /* force clock reconfiguration */
253 host->clock = 0;
254 sdhci_set_ios(host->mmc, &host->mmc->ios);
255 }
256}
257
258static void sdhci_reinit(struct sdhci_host *host)
259{
260 sdhci_init(host, 0);
261 /*
262 * Retuning stuffs are affected by different cards inserted and only
263 * applicable to UHS-I cards. So reset these fields to their initial
264 * value when card is removed.
265 */
266 if (host->flags & SDHCI_USING_RETUNING_TIMER) {
267 host->flags &= ~SDHCI_USING_RETUNING_TIMER;
268
269 del_timer_sync(&host->tuning_timer);
270 host->flags &= ~SDHCI_NEEDS_RETUNING;
271 host->mmc->max_blk_count =
272 (host->quirks & SDHCI_QUIRK_NO_MULTIBLOCK) ? 1 : 65535;
273 }
274 sdhci_enable_card_detection(host);
275}
276
277static void sdhci_activate_led(struct sdhci_host *host)
278{
279 u8 ctrl;
280
281 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
282 ctrl |= SDHCI_CTRL_LED;
283 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
284}
285
286static void sdhci_deactivate_led(struct sdhci_host *host)
287{
288 u8 ctrl;
289
290 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
291 ctrl &= ~SDHCI_CTRL_LED;
292 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
293}
294
295#ifdef SDHCI_USE_LEDS_CLASS
296static void sdhci_led_control(struct led_classdev *led,
297 enum led_brightness brightness)
298{
299 struct sdhci_host *host = container_of(led, struct sdhci_host, led);
300 unsigned long flags;
301
302 spin_lock_irqsave(&host->lock, flags);
303
304 if (host->runtime_suspended)
305 goto out;
306
307 if (brightness == LED_OFF)
308 sdhci_deactivate_led(host);
309 else
310 sdhci_activate_led(host);
311out:
312 spin_unlock_irqrestore(&host->lock, flags);
313}
314#endif
315
316/*****************************************************************************\
317 * *
318 * Core functions *
319 * *
320\*****************************************************************************/
321
322static void sdhci_read_block_pio(struct sdhci_host *host)
323{
324 unsigned long flags;
325 size_t blksize, len, chunk;
326 u32 uninitialized_var(scratch);
327 u8 *buf;
328
329 DBG("PIO reading\n");
330
331 blksize = host->data->blksz;
332 chunk = 0;
333
334 local_irq_save(flags);
335
336 while (blksize) {
337 if (!sg_miter_next(&host->sg_miter))
338 BUG();
339
340 len = min(host->sg_miter.length, blksize);
341
342 blksize -= len;
343 host->sg_miter.consumed = len;
344
345 buf = host->sg_miter.addr;
346
347 while (len) {
348 if (chunk == 0) {
349 scratch = sdhci_readl(host, SDHCI_BUFFER);
350 chunk = 4;
351 }
352
353 *buf = scratch & 0xFF;
354
355 buf++;
356 scratch >>= 8;
357 chunk--;
358 len--;
359 }
360 }
361
362 sg_miter_stop(&host->sg_miter);
363
364 local_irq_restore(flags);
365}
366
367static void sdhci_write_block_pio(struct sdhci_host *host)
368{
369 unsigned long flags;
370 size_t blksize, len, chunk;
371 u32 scratch;
372 u8 *buf;
373
374 DBG("PIO writing\n");
375
376 blksize = host->data->blksz;
377 chunk = 0;
378 scratch = 0;
379
380 local_irq_save(flags);
381
382 while (blksize) {
383 if (!sg_miter_next(&host->sg_miter))
384 BUG();
385
386 len = min(host->sg_miter.length, blksize);
387
388 blksize -= len;
389 host->sg_miter.consumed = len;
390
391 buf = host->sg_miter.addr;
392
393 while (len) {
394 scratch |= (u32)*buf << (chunk * 8);
395
396 buf++;
397 chunk++;
398 len--;
399
400 if ((chunk == 4) || ((len == 0) && (blksize == 0))) {
401 sdhci_writel(host, scratch, SDHCI_BUFFER);
402 chunk = 0;
403 scratch = 0;
404 }
405 }
406 }
407
408 sg_miter_stop(&host->sg_miter);
409
410 local_irq_restore(flags);
411}
412
413static void sdhci_transfer_pio(struct sdhci_host *host)
414{
415 u32 mask;
416
417 BUG_ON(!host->data);
418
419 if (host->blocks == 0)
420 return;
421
422 if (host->data->flags & MMC_DATA_READ)
423 mask = SDHCI_DATA_AVAILABLE;
424 else
425 mask = SDHCI_SPACE_AVAILABLE;
426
427 /*
428 * Some controllers (JMicron JMB38x) mess up the buffer bits
429 * for transfers < 4 bytes. As long as it is just one block,
430 * we can ignore the bits.
431 */
432 if ((host->quirks & SDHCI_QUIRK_BROKEN_SMALL_PIO) &&
433 (host->data->blocks == 1))
434 mask = ~0;
435
436 while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) {
437 if (host->quirks & SDHCI_QUIRK_PIO_NEEDS_DELAY)
438 udelay(100);
439
440 if (host->data->flags & MMC_DATA_READ)
441 sdhci_read_block_pio(host);
442 else
443 sdhci_write_block_pio(host);
444
445 host->blocks--;
446 if (host->blocks == 0)
447 break;
448 }
449
450 DBG("PIO transfer complete.\n");
451}
452
453static char *sdhci_kmap_atomic(struct scatterlist *sg, unsigned long *flags)
454{
455 local_irq_save(*flags);
456 return kmap_atomic(sg_page(sg)) + sg->offset;
457}
458
459static void sdhci_kunmap_atomic(void *buffer, unsigned long *flags)
460{
461 kunmap_atomic(buffer);
462 local_irq_restore(*flags);
463}
464
465static void sdhci_set_adma_desc(u8 *desc, u32 addr, int len, unsigned cmd)
466{
467 __le32 *dataddr = (__le32 __force *)(desc + 4);
468 __le16 *cmdlen = (__le16 __force *)desc;
469
470 /* SDHCI specification says ADMA descriptors should be 4 byte
471 * aligned, so using 16 or 32bit operations should be safe. */
472
473 cmdlen[0] = cpu_to_le16(cmd);
474 cmdlen[1] = cpu_to_le16(len);
475
476 dataddr[0] = cpu_to_le32(addr);
477}
478
479static int sdhci_adma_table_pre(struct sdhci_host *host,
480 struct mmc_data *data)
481{
482 int direction;
483
484 u8 *desc;
485 u8 *align;
486 dma_addr_t addr;
487 dma_addr_t align_addr;
488 int len, offset;
489
490 struct scatterlist *sg;
491 int i;
492 char *buffer;
493 unsigned long flags;
494
495 /*
496 * The spec does not specify endianness of descriptor table.
497 * We currently guess that it is LE.
498 */
499
500 if (data->flags & MMC_DATA_READ)
501 direction = DMA_FROM_DEVICE;
502 else
503 direction = DMA_TO_DEVICE;
504
505 /*
506 * The ADMA descriptor table is mapped further down as we
507 * need to fill it with data first.
508 */
509
510 host->align_addr = dma_map_single(mmc_dev(host->mmc),
511 host->align_buffer, 128 * 4, direction);
512 if (dma_mapping_error(mmc_dev(host->mmc), host->align_addr))
513 goto fail;
514 BUG_ON(host->align_addr & 0x3);
515
516 host->sg_count = dma_map_sg(mmc_dev(host->mmc),
517 data->sg, data->sg_len, direction);
518 if (host->sg_count == 0)
519 goto unmap_align;
520
521 desc = host->adma_desc;
522 align = host->align_buffer;
523
524 align_addr = host->align_addr;
525
526 for_each_sg(data->sg, sg, host->sg_count, i) {
527 addr = sg_dma_address(sg);
528 len = sg_dma_len(sg);
529
530 /*
531 * The SDHCI specification states that ADMA
532 * addresses must be 32-bit aligned. If they
533 * aren't, then we use a bounce buffer for
534 * the (up to three) bytes that screw up the
535 * alignment.
536 */
537 offset = (4 - (addr & 0x3)) & 0x3;
538 if (offset) {
539 if (data->flags & MMC_DATA_WRITE) {
540 buffer = sdhci_kmap_atomic(sg, &flags);
541 WARN_ON(((long)buffer & PAGE_MASK) > (PAGE_SIZE - 3));
542 memcpy(align, buffer, offset);
543 sdhci_kunmap_atomic(buffer, &flags);
544 }
545
546 /* tran, valid */
547 sdhci_set_adma_desc(desc, align_addr, offset, 0x21);
548
549 BUG_ON(offset > 65536);
550
551 align += 4;
552 align_addr += 4;
553
554 desc += 8;
555
556 addr += offset;
557 len -= offset;
558 }
559
560 BUG_ON(len > 65536);
561
562 /* tran, valid */
563 sdhci_set_adma_desc(desc, addr, len, 0x21);
564 desc += 8;
565
566 /*
567 * If this triggers then we have a calculation bug
568 * somewhere. :/
569 */
570 WARN_ON((desc - host->adma_desc) > (128 * 2 + 1) * 4);
571 }
572
573 if (host->quirks & SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC) {
574 /*
575 * Mark the last descriptor as the terminating descriptor
576 */
577 if (desc != host->adma_desc) {
578 desc -= 8;
579 desc[0] |= 0x2; /* end */
580 }
581 } else {
582 /*
583 * Add a terminating entry.
584 */
585
586 /* nop, end, valid */
587 sdhci_set_adma_desc(desc, 0, 0, 0x3);
588 }
589
590 /*
591 * Resync align buffer as we might have changed it.
592 */
593 if (data->flags & MMC_DATA_WRITE) {
594 dma_sync_single_for_device(mmc_dev(host->mmc),
595 host->align_addr, 128 * 4, direction);
596 }
597
598 host->adma_addr = dma_map_single(mmc_dev(host->mmc),
599 host->adma_desc, (128 * 2 + 1) * 4, DMA_TO_DEVICE);
600 if (dma_mapping_error(mmc_dev(host->mmc), host->adma_addr))
601 goto unmap_entries;
602 BUG_ON(host->adma_addr & 0x3);
603
604 return 0;
605
606unmap_entries:
607 dma_unmap_sg(mmc_dev(host->mmc), data->sg,
608 data->sg_len, direction);
609unmap_align:
610 dma_unmap_single(mmc_dev(host->mmc), host->align_addr,
611 128 * 4, direction);
612fail:
613 return -EINVAL;
614}
615
616static void sdhci_adma_table_post(struct sdhci_host *host,
617 struct mmc_data *data)
618{
619 int direction;
620
621 struct scatterlist *sg;
622 int i, size;
623 u8 *align;
624 char *buffer;
625 unsigned long flags;
626
627 if (data->flags & MMC_DATA_READ)
628 direction = DMA_FROM_DEVICE;
629 else
630 direction = DMA_TO_DEVICE;
631
632 dma_unmap_single(mmc_dev(host->mmc), host->adma_addr,
633 (128 * 2 + 1) * 4, DMA_TO_DEVICE);
634
635 dma_unmap_single(mmc_dev(host->mmc), host->align_addr,
636 128 * 4, direction);
637
638 if (data->flags & MMC_DATA_READ) {
639 dma_sync_sg_for_cpu(mmc_dev(host->mmc), data->sg,
640 data->sg_len, direction);
641
642 align = host->align_buffer;
643
644 for_each_sg(data->sg, sg, host->sg_count, i) {
645 if (sg_dma_address(sg) & 0x3) {
646 size = 4 - (sg_dma_address(sg) & 0x3);
647
648 buffer = sdhci_kmap_atomic(sg, &flags);
649 WARN_ON(((long)buffer & PAGE_MASK) > (PAGE_SIZE - 3));
650 memcpy(buffer, align, size);
651 sdhci_kunmap_atomic(buffer, &flags);
652
653 align += 4;
654 }
655 }
656 }
657
658 dma_unmap_sg(mmc_dev(host->mmc), data->sg,
659 data->sg_len, direction);
660}
661
662static u8 sdhci_calc_timeout(struct sdhci_host *host, struct mmc_command *cmd)
663{
664 u8 count;
665 struct mmc_data *data = cmd->data;
666 unsigned target_timeout, current_timeout;
667
668 /*
669 * If the host controller provides us with an incorrect timeout
670 * value, just skip the check and use 0xE. The hardware may take
671 * longer to time out, but that's much better than having a too-short
672 * timeout value.
673 */
674 if (host->quirks & SDHCI_QUIRK_BROKEN_TIMEOUT_VAL)
675 return 0xE;
676
677 /* Unspecified timeout, assume max */
678 if (!data && !cmd->busy_timeout)
679 return 0xE;
680
681 /* timeout in us */
682 if (!data)
683 target_timeout = cmd->busy_timeout * 1000;
684 else {
685 target_timeout = data->timeout_ns / 1000;
686 if (host->clock)
687 target_timeout += data->timeout_clks / host->clock;
688 }
689
690 /*
691 * Figure out needed cycles.
692 * We do this in steps in order to fit inside a 32 bit int.
693 * The first step is the minimum timeout, which will have a
694 * minimum resolution of 6 bits:
695 * (1) 2^13*1000 > 2^22,
696 * (2) host->timeout_clk < 2^16
697 * =>
698 * (1) / (2) > 2^6
699 */
700 count = 0;
701 current_timeout = (1 << 13) * 1000 / host->timeout_clk;
702 while (current_timeout < target_timeout) {
703 count++;
704 current_timeout <<= 1;
705 if (count >= 0xF)
706 break;
707 }
708
709 if (count >= 0xF) {
710 DBG("%s: Too large timeout 0x%x requested for CMD%d!\n",
711 mmc_hostname(host->mmc), count, cmd->opcode);
712 count = 0xE;
713 }
714
715 return count;
716}
717
718static void sdhci_set_transfer_irqs(struct sdhci_host *host)
719{
720 u32 pio_irqs = SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL;
721 u32 dma_irqs = SDHCI_INT_DMA_END | SDHCI_INT_ADMA_ERROR;
722
723 if (host->flags & SDHCI_REQ_USE_DMA)
724 sdhci_clear_set_irqs(host, pio_irqs, dma_irqs);
725 else
726 sdhci_clear_set_irqs(host, dma_irqs, pio_irqs);
727}
728
729static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd)
730{
731 u8 count;
732 u8 ctrl;
733 struct mmc_data *data = cmd->data;
734 int ret;
735
736 WARN_ON(host->data);
737
738 if (data || (cmd->flags & MMC_RSP_BUSY)) {
739 count = sdhci_calc_timeout(host, cmd);
740 sdhci_writeb(host, count, SDHCI_TIMEOUT_CONTROL);
741 }
742
743 if (!data)
744 return;
745
746 /* Sanity checks */
747 BUG_ON(data->blksz * data->blocks > 524288);
748 BUG_ON(data->blksz > host->mmc->max_blk_size);
749 BUG_ON(data->blocks > 65535);
750
751 host->data = data;
752 host->data_early = 0;
753 host->data->bytes_xfered = 0;
754
755 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA))
756 host->flags |= SDHCI_REQ_USE_DMA;
757
758 /*
759 * FIXME: This doesn't account for merging when mapping the
760 * scatterlist.
761 */
762 if (host->flags & SDHCI_REQ_USE_DMA) {
763 int broken, i;
764 struct scatterlist *sg;
765
766 broken = 0;
767 if (host->flags & SDHCI_USE_ADMA) {
768 if (host->quirks & SDHCI_QUIRK_32BIT_ADMA_SIZE)
769 broken = 1;
770 } else {
771 if (host->quirks & SDHCI_QUIRK_32BIT_DMA_SIZE)
772 broken = 1;
773 }
774
775 if (unlikely(broken)) {
776 for_each_sg(data->sg, sg, data->sg_len, i) {
777 if (sg->length & 0x3) {
778 DBG("Reverting to PIO because of "
779 "transfer size (%d)\n",
780 sg->length);
781 host->flags &= ~SDHCI_REQ_USE_DMA;
782 break;
783 }
784 }
785 }
786 }
787
788 /*
789 * The assumption here being that alignment is the same after
790 * translation to device address space.
791 */
792 if (host->flags & SDHCI_REQ_USE_DMA) {
793 int broken, i;
794 struct scatterlist *sg;
795
796 broken = 0;
797 if (host->flags & SDHCI_USE_ADMA) {
798 /*
799 * As we use 3 byte chunks to work around
800 * alignment problems, we need to check this
801 * quirk.
802 */
803 if (host->quirks & SDHCI_QUIRK_32BIT_ADMA_SIZE)
804 broken = 1;
805 } else {
806 if (host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR)
807 broken = 1;
808 }
809
810 if (unlikely(broken)) {
811 for_each_sg(data->sg, sg, data->sg_len, i) {
812 if (sg->offset & 0x3) {
813 DBG("Reverting to PIO because of "
814 "bad alignment\n");
815 host->flags &= ~SDHCI_REQ_USE_DMA;
816 break;
817 }
818 }
819 }
820 }
821
822 if (host->flags & SDHCI_REQ_USE_DMA) {
823 if (host->flags & SDHCI_USE_ADMA) {
824 ret = sdhci_adma_table_pre(host, data);
825 if (ret) {
826 /*
827 * This only happens when someone fed
828 * us an invalid request.
829 */
830 WARN_ON(1);
831 host->flags &= ~SDHCI_REQ_USE_DMA;
832 } else {
833 sdhci_writel(host, host->adma_addr,
834 SDHCI_ADMA_ADDRESS);
835 }
836 } else {
837 int sg_cnt;
838
839 sg_cnt = dma_map_sg(mmc_dev(host->mmc),
840 data->sg, data->sg_len,
841 (data->flags & MMC_DATA_READ) ?
842 DMA_FROM_DEVICE :
843 DMA_TO_DEVICE);
844 if (sg_cnt == 0) {
845 /*
846 * This only happens when someone fed
847 * us an invalid request.
848 */
849 WARN_ON(1);
850 host->flags &= ~SDHCI_REQ_USE_DMA;
851 } else {
852 WARN_ON(sg_cnt != 1);
853 sdhci_writel(host, sg_dma_address(data->sg),
854 SDHCI_DMA_ADDRESS);
855 }
856 }
857 }
858
859 /*
860 * Always adjust the DMA selection as some controllers
861 * (e.g. JMicron) can't do PIO properly when the selection
862 * is ADMA.
863 */
864 if (host->version >= SDHCI_SPEC_200) {
865 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
866 ctrl &= ~SDHCI_CTRL_DMA_MASK;
867 if ((host->flags & SDHCI_REQ_USE_DMA) &&
868 (host->flags & SDHCI_USE_ADMA))
869 ctrl |= SDHCI_CTRL_ADMA32;
870 else
871 ctrl |= SDHCI_CTRL_SDMA;
872 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
873 }
874
875 if (!(host->flags & SDHCI_REQ_USE_DMA)) {
876 int flags;
877
878 flags = SG_MITER_ATOMIC;
879 if (host->data->flags & MMC_DATA_READ)
880 flags |= SG_MITER_TO_SG;
881 else
882 flags |= SG_MITER_FROM_SG;
883 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
884 host->blocks = data->blocks;
885 }
886
887 sdhci_set_transfer_irqs(host);
888
889 /* Set the DMA boundary value and block size */
890 sdhci_writew(host, SDHCI_MAKE_BLKSZ(SDHCI_DEFAULT_BOUNDARY_ARG,
891 data->blksz), SDHCI_BLOCK_SIZE);
892 sdhci_writew(host, data->blocks, SDHCI_BLOCK_COUNT);
893}
894
895static void sdhci_set_transfer_mode(struct sdhci_host *host,
896 struct mmc_command *cmd)
897{
898 u16 mode;
899 struct mmc_data *data = cmd->data;
900
901 if (data == NULL) {
902 /* clear Auto CMD settings for no data CMDs */
903 mode = sdhci_readw(host, SDHCI_TRANSFER_MODE);
904 sdhci_writew(host, mode & ~(SDHCI_TRNS_AUTO_CMD12 |
905 SDHCI_TRNS_AUTO_CMD23), SDHCI_TRANSFER_MODE);
906 return;
907 }
908
909 WARN_ON(!host->data);
910
911 mode = SDHCI_TRNS_BLK_CNT_EN;
912 if (mmc_op_multi(cmd->opcode) || data->blocks > 1) {
913 mode |= SDHCI_TRNS_MULTI;
914 /*
915 * If we are sending CMD23, CMD12 never gets sent
916 * on successful completion (so no Auto-CMD12).
917 */
918 if (!host->mrq->sbc && (host->flags & SDHCI_AUTO_CMD12))
919 mode |= SDHCI_TRNS_AUTO_CMD12;
920 else if (host->mrq->sbc && (host->flags & SDHCI_AUTO_CMD23)) {
921 mode |= SDHCI_TRNS_AUTO_CMD23;
922 sdhci_writel(host, host->mrq->sbc->arg, SDHCI_ARGUMENT2);
923 }
924 }
925
926 if (data->flags & MMC_DATA_READ)
927 mode |= SDHCI_TRNS_READ;
928 if (host->flags & SDHCI_REQ_USE_DMA)
929 mode |= SDHCI_TRNS_DMA;
930
931 sdhci_writew(host, mode, SDHCI_TRANSFER_MODE);
932}
933
934static void sdhci_finish_data(struct sdhci_host *host)
935{
936 struct mmc_data *data;
937
938 BUG_ON(!host->data);
939
940 data = host->data;
941 host->data = NULL;
942
943 if (host->flags & SDHCI_REQ_USE_DMA) {
944 if (host->flags & SDHCI_USE_ADMA)
945 sdhci_adma_table_post(host, data);
946 else {
947 dma_unmap_sg(mmc_dev(host->mmc), data->sg,
948 data->sg_len, (data->flags & MMC_DATA_READ) ?
949 DMA_FROM_DEVICE : DMA_TO_DEVICE);
950 }
951 }
952
953 /*
954 * The specification states that the block count register must
955 * be updated, but it does not specify at what point in the
956 * data flow. That makes the register entirely useless to read
957 * back so we have to assume that nothing made it to the card
958 * in the event of an error.
959 */
960 if (data->error)
961 data->bytes_xfered = 0;
962 else
963 data->bytes_xfered = data->blksz * data->blocks;
964
965 /*
966 * Need to send CMD12 if -
967 * a) open-ended multiblock transfer (no CMD23)
968 * b) error in multiblock transfer
969 */
970 if (data->stop &&
971 (data->error ||
972 !host->mrq->sbc)) {
973
974 /*
975 * The controller needs a reset of internal state machines
976 * upon error conditions.
977 */
978 if (data->error) {
979 sdhci_reset(host, SDHCI_RESET_CMD);
980 sdhci_reset(host, SDHCI_RESET_DATA);
981 }
982
983 sdhci_send_command(host, data->stop);
984 } else
985 tasklet_schedule(&host->finish_tasklet);
986}
987
988void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
989{
990 int flags;
991 u32 mask;
992 unsigned long timeout;
993
994 WARN_ON(host->cmd);
995
996 /* Wait max 10 ms */
997 timeout = 10;
998
999 mask = SDHCI_CMD_INHIBIT;
1000 if ((cmd->data != NULL) || (cmd->flags & MMC_RSP_BUSY))
1001 mask |= SDHCI_DATA_INHIBIT;
1002
1003 /* We shouldn't wait for data inihibit for stop commands, even
1004 though they might use busy signaling */
1005 if (host->mrq->data && (cmd == host->mrq->data->stop))
1006 mask &= ~SDHCI_DATA_INHIBIT;
1007
1008 while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) {
1009 if (timeout == 0) {
1010 pr_err("%s: Controller never released "
1011 "inhibit bit(s).\n", mmc_hostname(host->mmc));
1012 sdhci_dumpregs(host);
1013 cmd->error = -EIO;
1014 tasklet_schedule(&host->finish_tasklet);
1015 return;
1016 }
1017 timeout--;
1018 mdelay(1);
1019 }
1020
1021 timeout = jiffies;
1022 if (!cmd->data && cmd->busy_timeout > 9000)
1023 timeout += DIV_ROUND_UP(cmd->busy_timeout, 1000) * HZ + HZ;
1024 else
1025 timeout += 10 * HZ;
1026 mod_timer(&host->timer, timeout);
1027
1028 host->cmd = cmd;
1029
1030 sdhci_prepare_data(host, cmd);
1031
1032 sdhci_writel(host, cmd->arg, SDHCI_ARGUMENT);
1033
1034 sdhci_set_transfer_mode(host, cmd);
1035
1036 if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
1037 pr_err("%s: Unsupported response type!\n",
1038 mmc_hostname(host->mmc));
1039 cmd->error = -EINVAL;
1040 tasklet_schedule(&host->finish_tasklet);
1041 return;
1042 }
1043
1044 if (!(cmd->flags & MMC_RSP_PRESENT))
1045 flags = SDHCI_CMD_RESP_NONE;
1046 else if (cmd->flags & MMC_RSP_136)
1047 flags = SDHCI_CMD_RESP_LONG;
1048 else if (cmd->flags & MMC_RSP_BUSY)
1049 flags = SDHCI_CMD_RESP_SHORT_BUSY;
1050 else
1051 flags = SDHCI_CMD_RESP_SHORT;
1052
1053 if (cmd->flags & MMC_RSP_CRC)
1054 flags |= SDHCI_CMD_CRC;
1055 if (cmd->flags & MMC_RSP_OPCODE)
1056 flags |= SDHCI_CMD_INDEX;
1057
1058 /* CMD19 is special in that the Data Present Select should be set */
1059 if (cmd->data || cmd->opcode == MMC_SEND_TUNING_BLOCK ||
1060 cmd->opcode == MMC_SEND_TUNING_BLOCK_HS200)
1061 flags |= SDHCI_CMD_DATA;
1062
1063 sdhci_writew(host, SDHCI_MAKE_CMD(cmd->opcode, flags), SDHCI_COMMAND);
1064}
1065EXPORT_SYMBOL_GPL(sdhci_send_command);
1066
1067static void sdhci_finish_command(struct sdhci_host *host)
1068{
1069 int i;
1070
1071 BUG_ON(host->cmd == NULL);
1072
1073 if (host->cmd->flags & MMC_RSP_PRESENT) {
1074 if (host->cmd->flags & MMC_RSP_136) {
1075 /* CRC is stripped so we need to do some shifting. */
1076 for (i = 0;i < 4;i++) {
1077 host->cmd->resp[i] = sdhci_readl(host,
1078 SDHCI_RESPONSE + (3-i)*4) << 8;
1079 if (i != 3)
1080 host->cmd->resp[i] |=
1081 sdhci_readb(host,
1082 SDHCI_RESPONSE + (3-i)*4-1);
1083 }
1084 } else {
1085 host->cmd->resp[0] = sdhci_readl(host, SDHCI_RESPONSE);
1086 }
1087 }
1088
1089 host->cmd->error = 0;
1090
1091 /* Finished CMD23, now send actual command. */
1092 if (host->cmd == host->mrq->sbc) {
1093 host->cmd = NULL;
1094 sdhci_send_command(host, host->mrq->cmd);
1095 } else {
1096
1097 /* Processed actual command. */
1098 if (host->data && host->data_early)
1099 sdhci_finish_data(host);
1100
1101 if (!host->cmd->data)
1102 tasklet_schedule(&host->finish_tasklet);
1103
1104 host->cmd = NULL;
1105 }
1106}
1107
1108static u16 sdhci_get_preset_value(struct sdhci_host *host)
1109{
1110 u16 ctrl, preset = 0;
1111
1112 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1113
1114 switch (ctrl & SDHCI_CTRL_UHS_MASK) {
1115 case SDHCI_CTRL_UHS_SDR12:
1116 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR12);
1117 break;
1118 case SDHCI_CTRL_UHS_SDR25:
1119 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR25);
1120 break;
1121 case SDHCI_CTRL_UHS_SDR50:
1122 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR50);
1123 break;
1124 case SDHCI_CTRL_UHS_SDR104:
1125 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR104);
1126 break;
1127 case SDHCI_CTRL_UHS_DDR50:
1128 preset = sdhci_readw(host, SDHCI_PRESET_FOR_DDR50);
1129 break;
1130 default:
1131 pr_warn("%s: Invalid UHS-I mode selected\n",
1132 mmc_hostname(host->mmc));
1133 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR12);
1134 break;
1135 }
1136 return preset;
1137}
1138
1139static void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
1140{
1141 int div = 0; /* Initialized for compiler warning */
1142 int real_div = div, clk_mul = 1;
1143 u16 clk = 0;
1144 unsigned long timeout;
1145
1146 if (clock && clock == host->clock)
1147 return;
1148
1149 host->mmc->actual_clock = 0;
1150
1151 if (host->ops->set_clock) {
1152 host->ops->set_clock(host, clock);
1153 if (host->quirks & SDHCI_QUIRK_NONSTANDARD_CLOCK)
1154 return;
1155 }
1156
1157 sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
1158
1159 if (clock == 0)
1160 goto out;
1161
1162 if (host->version >= SDHCI_SPEC_300) {
1163 if (sdhci_readw(host, SDHCI_HOST_CONTROL2) &
1164 SDHCI_CTRL_PRESET_VAL_ENABLE) {
1165 u16 pre_val;
1166
1167 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1168 pre_val = sdhci_get_preset_value(host);
1169 div = (pre_val & SDHCI_PRESET_SDCLK_FREQ_MASK)
1170 >> SDHCI_PRESET_SDCLK_FREQ_SHIFT;
1171 if (host->clk_mul &&
1172 (pre_val & SDHCI_PRESET_CLKGEN_SEL_MASK)) {
1173 clk = SDHCI_PROG_CLOCK_MODE;
1174 real_div = div + 1;
1175 clk_mul = host->clk_mul;
1176 } else {
1177 real_div = max_t(int, 1, div << 1);
1178 }
1179 goto clock_set;
1180 }
1181
1182 /*
1183 * Check if the Host Controller supports Programmable Clock
1184 * Mode.
1185 */
1186 if (host->clk_mul) {
1187 for (div = 1; div <= 1024; div++) {
1188 if ((host->max_clk * host->clk_mul / div)
1189 <= clock)
1190 break;
1191 }
1192 /*
1193 * Set Programmable Clock Mode in the Clock
1194 * Control register.
1195 */
1196 clk = SDHCI_PROG_CLOCK_MODE;
1197 real_div = div;
1198 clk_mul = host->clk_mul;
1199 div--;
1200 } else {
1201 /* Version 3.00 divisors must be a multiple of 2. */
1202 if (host->max_clk <= clock)
1203 div = 1;
1204 else {
1205 for (div = 2; div < SDHCI_MAX_DIV_SPEC_300;
1206 div += 2) {
1207 if ((host->max_clk / div) <= clock)
1208 break;
1209 }
1210 }
1211 real_div = div;
1212 div >>= 1;
1213 }
1214 } else {
1215 /* Version 2.00 divisors must be a power of 2. */
1216 for (div = 1; div < SDHCI_MAX_DIV_SPEC_200; div *= 2) {
1217 if ((host->max_clk / div) <= clock)
1218 break;
1219 }
1220 real_div = div;
1221 div >>= 1;
1222 }
1223
1224clock_set:
1225 if (real_div)
1226 host->mmc->actual_clock = (host->max_clk * clk_mul) / real_div;
1227
1228 clk |= (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT;
1229 clk |= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN)
1230 << SDHCI_DIVIDER_HI_SHIFT;
1231 clk |= SDHCI_CLOCK_INT_EN;
1232 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1233
1234 /* Wait max 20 ms */
1235 timeout = 20;
1236 while (!((clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL))
1237 & SDHCI_CLOCK_INT_STABLE)) {
1238 if (timeout == 0) {
1239 pr_err("%s: Internal clock never "
1240 "stabilised.\n", mmc_hostname(host->mmc));
1241 sdhci_dumpregs(host);
1242 return;
1243 }
1244 timeout--;
1245 mdelay(1);
1246 }
1247
1248 clk |= SDHCI_CLOCK_CARD_EN;
1249 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1250
1251out:
1252 host->clock = clock;
1253}
1254
1255static inline void sdhci_update_clock(struct sdhci_host *host)
1256{
1257 unsigned int clock;
1258
1259 clock = host->clock;
1260 host->clock = 0;
1261 sdhci_set_clock(host, clock);
1262}
1263
1264static int sdhci_set_power(struct sdhci_host *host, unsigned short power)
1265{
1266 u8 pwr = 0;
1267
1268 if (power != (unsigned short)-1) {
1269 switch (1 << power) {
1270 case MMC_VDD_165_195:
1271 pwr = SDHCI_POWER_180;
1272 break;
1273 case MMC_VDD_29_30:
1274 case MMC_VDD_30_31:
1275 pwr = SDHCI_POWER_300;
1276 break;
1277 case MMC_VDD_32_33:
1278 case MMC_VDD_33_34:
1279 pwr = SDHCI_POWER_330;
1280 break;
1281 default:
1282 BUG();
1283 }
1284 }
1285
1286 if (host->pwr == pwr)
1287 return -1;
1288
1289 host->pwr = pwr;
1290
1291 if (pwr == 0) {
1292 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
1293 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
1294 sdhci_runtime_pm_bus_off(host);
1295 return 0;
1296 }
1297
1298 /*
1299 * Spec says that we should clear the power reg before setting
1300 * a new value. Some controllers don't seem to like this though.
1301 */
1302 if (!(host->quirks & SDHCI_QUIRK_SINGLE_POWER_WRITE))
1303 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
1304
1305 /*
1306 * At least the Marvell CaFe chip gets confused if we set the voltage
1307 * and set turn on power at the same time, so set the voltage first.
1308 */
1309 if (host->quirks & SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER)
1310 sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
1311
1312 pwr |= SDHCI_POWER_ON;
1313
1314 sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
1315
1316 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
1317 sdhci_runtime_pm_bus_on(host);
1318
1319 /*
1320 * Some controllers need an extra 10ms delay of 10ms before they
1321 * can apply clock after applying power
1322 */
1323 if (host->quirks & SDHCI_QUIRK_DELAY_AFTER_POWER)
1324 mdelay(10);
1325
1326 return power;
1327}
1328
1329/*****************************************************************************\
1330 * *
1331 * MMC callbacks *
1332 * *
1333\*****************************************************************************/
1334
1335static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
1336{
1337 struct sdhci_host *host;
1338 int present;
1339 unsigned long flags;
1340 u32 tuning_opcode;
1341
1342 host = mmc_priv(mmc);
1343
1344 sdhci_runtime_pm_get(host);
1345
1346 spin_lock_irqsave(&host->lock, flags);
1347
1348 WARN_ON(host->mrq != NULL);
1349
1350#ifndef SDHCI_USE_LEDS_CLASS
1351 sdhci_activate_led(host);
1352#endif
1353
1354 /*
1355 * Ensure we don't send the STOP for non-SET_BLOCK_COUNTED
1356 * requests if Auto-CMD12 is enabled.
1357 */
1358 if (!mrq->sbc && (host->flags & SDHCI_AUTO_CMD12)) {
1359 if (mrq->stop) {
1360 mrq->data->stop = NULL;
1361 mrq->stop = NULL;
1362 }
1363 }
1364
1365 host->mrq = mrq;
1366
1367 /*
1368 * Firstly check card presence from cd-gpio. The return could
1369 * be one of the following possibilities:
1370 * negative: cd-gpio is not available
1371 * zero: cd-gpio is used, and card is removed
1372 * one: cd-gpio is used, and card is present
1373 */
1374 present = mmc_gpio_get_cd(host->mmc);
1375 if (present < 0) {
1376 /* If polling, assume that the card is always present. */
1377 if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
1378 present = 1;
1379 else
1380 present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
1381 SDHCI_CARD_PRESENT;
1382 }
1383
1384 if (!present || host->flags & SDHCI_DEVICE_DEAD) {
1385 host->mrq->cmd->error = -ENOMEDIUM;
1386 tasklet_schedule(&host->finish_tasklet);
1387 } else {
1388 u32 present_state;
1389
1390 present_state = sdhci_readl(host, SDHCI_PRESENT_STATE);
1391 /*
1392 * Check if the re-tuning timer has already expired and there
1393 * is no on-going data transfer. If so, we need to execute
1394 * tuning procedure before sending command.
1395 */
1396 if ((host->flags & SDHCI_NEEDS_RETUNING) &&
1397 !(present_state & (SDHCI_DOING_WRITE | SDHCI_DOING_READ))) {
1398 if (mmc->card) {
1399 /* eMMC uses cmd21 but sd and sdio use cmd19 */
1400 tuning_opcode =
1401 mmc->card->type == MMC_TYPE_MMC ?
1402 MMC_SEND_TUNING_BLOCK_HS200 :
1403 MMC_SEND_TUNING_BLOCK;
1404
1405 /* Here we need to set the host->mrq to NULL,
1406 * in case the pending finish_tasklet
1407 * finishes it incorrectly.
1408 */
1409 host->mrq = NULL;
1410
1411 spin_unlock_irqrestore(&host->lock, flags);
1412 sdhci_execute_tuning(mmc, tuning_opcode);
1413 spin_lock_irqsave(&host->lock, flags);
1414
1415 /* Restore original mmc_request structure */
1416 host->mrq = mrq;
1417 }
1418 }
1419
1420 if (mrq->sbc && !(host->flags & SDHCI_AUTO_CMD23))
1421 sdhci_send_command(host, mrq->sbc);
1422 else
1423 sdhci_send_command(host, mrq->cmd);
1424 }
1425
1426 mmiowb();
1427 spin_unlock_irqrestore(&host->lock, flags);
1428}
1429
1430static void sdhci_do_set_ios(struct sdhci_host *host, struct mmc_ios *ios)
1431{
1432 unsigned long flags;
1433 int vdd_bit = -1;
1434 u8 ctrl;
1435
1436 spin_lock_irqsave(&host->lock, flags);
1437
1438 if (host->flags & SDHCI_DEVICE_DEAD) {
1439 spin_unlock_irqrestore(&host->lock, flags);
1440 if (host->vmmc && ios->power_mode == MMC_POWER_OFF)
1441 mmc_regulator_set_ocr(host->mmc, host->vmmc, 0);
1442 return;
1443 }
1444
1445 /*
1446 * Reset the chip on each power off.
1447 * Should clear out any weird states.
1448 */
1449 if (ios->power_mode == MMC_POWER_OFF) {
1450 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
1451 sdhci_reinit(host);
1452 }
1453
1454 if (host->version >= SDHCI_SPEC_300 &&
1455 (ios->power_mode == MMC_POWER_UP) &&
1456 !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN))
1457 sdhci_enable_preset_value(host, false);
1458
1459 sdhci_set_clock(host, ios->clock);
1460
1461 if (ios->power_mode == MMC_POWER_OFF)
1462 vdd_bit = sdhci_set_power(host, -1);
1463 else
1464 vdd_bit = sdhci_set_power(host, ios->vdd);
1465
1466 if (host->vmmc && vdd_bit != -1) {
1467 spin_unlock_irqrestore(&host->lock, flags);
1468 mmc_regulator_set_ocr(host->mmc, host->vmmc, vdd_bit);
1469 spin_lock_irqsave(&host->lock, flags);
1470 }
1471
1472 if (host->ops->platform_send_init_74_clocks)
1473 host->ops->platform_send_init_74_clocks(host, ios->power_mode);
1474
1475 /*
1476 * If your platform has 8-bit width support but is not a v3 controller,
1477 * or if it requires special setup code, you should implement that in
1478 * platform_bus_width().
1479 */
1480 if (host->ops->platform_bus_width) {
1481 host->ops->platform_bus_width(host, ios->bus_width);
1482 } else {
1483 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
1484 if (ios->bus_width == MMC_BUS_WIDTH_8) {
1485 ctrl &= ~SDHCI_CTRL_4BITBUS;
1486 if (host->version >= SDHCI_SPEC_300)
1487 ctrl |= SDHCI_CTRL_8BITBUS;
1488 } else {
1489 if (host->version >= SDHCI_SPEC_300)
1490 ctrl &= ~SDHCI_CTRL_8BITBUS;
1491 if (ios->bus_width == MMC_BUS_WIDTH_4)
1492 ctrl |= SDHCI_CTRL_4BITBUS;
1493 else
1494 ctrl &= ~SDHCI_CTRL_4BITBUS;
1495 }
1496 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1497 }
1498
1499 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
1500
1501 if ((ios->timing == MMC_TIMING_SD_HS ||
1502 ios->timing == MMC_TIMING_MMC_HS)
1503 && !(host->quirks & SDHCI_QUIRK_NO_HISPD_BIT))
1504 ctrl |= SDHCI_CTRL_HISPD;
1505 else
1506 ctrl &= ~SDHCI_CTRL_HISPD;
1507
1508 if (host->version >= SDHCI_SPEC_300) {
1509 u16 clk, ctrl_2;
1510
1511 /* In case of UHS-I modes, set High Speed Enable */
1512 if ((ios->timing == MMC_TIMING_MMC_HS200) ||
1513 (ios->timing == MMC_TIMING_UHS_SDR50) ||
1514 (ios->timing == MMC_TIMING_UHS_SDR104) ||
1515 (ios->timing == MMC_TIMING_UHS_DDR50) ||
1516 (ios->timing == MMC_TIMING_UHS_SDR25))
1517 ctrl |= SDHCI_CTRL_HISPD;
1518
1519 ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1520 if (!(ctrl_2 & SDHCI_CTRL_PRESET_VAL_ENABLE)) {
1521 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1522 /*
1523 * We only need to set Driver Strength if the
1524 * preset value enable is not set.
1525 */
1526 ctrl_2 &= ~SDHCI_CTRL_DRV_TYPE_MASK;
1527 if (ios->drv_type == MMC_SET_DRIVER_TYPE_A)
1528 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_A;
1529 else if (ios->drv_type == MMC_SET_DRIVER_TYPE_C)
1530 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_C;
1531
1532 sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
1533 } else {
1534 /*
1535 * According to SDHC Spec v3.00, if the Preset Value
1536 * Enable in the Host Control 2 register is set, we
1537 * need to reset SD Clock Enable before changing High
1538 * Speed Enable to avoid generating clock gliches.
1539 */
1540
1541 /* Reset SD Clock Enable */
1542 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1543 clk &= ~SDHCI_CLOCK_CARD_EN;
1544 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1545
1546 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1547
1548 /* Re-enable SD Clock */
1549 sdhci_update_clock(host);
1550 }
1551
1552
1553 /* Reset SD Clock Enable */
1554 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1555 clk &= ~SDHCI_CLOCK_CARD_EN;
1556 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1557
1558 if (host->ops->set_uhs_signaling)
1559 host->ops->set_uhs_signaling(host, ios->timing);
1560 else {
1561 ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1562 /* Select Bus Speed Mode for host */
1563 ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
1564 if ((ios->timing == MMC_TIMING_MMC_HS200) ||
1565 (ios->timing == MMC_TIMING_UHS_SDR104))
1566 ctrl_2 |= SDHCI_CTRL_UHS_SDR104;
1567 else if (ios->timing == MMC_TIMING_UHS_SDR12)
1568 ctrl_2 |= SDHCI_CTRL_UHS_SDR12;
1569 else if (ios->timing == MMC_TIMING_UHS_SDR25)
1570 ctrl_2 |= SDHCI_CTRL_UHS_SDR25;
1571 else if (ios->timing == MMC_TIMING_UHS_SDR50)
1572 ctrl_2 |= SDHCI_CTRL_UHS_SDR50;
1573 else if (ios->timing == MMC_TIMING_UHS_DDR50)
1574 ctrl_2 |= SDHCI_CTRL_UHS_DDR50;
1575 sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
1576 }
1577
1578 if (!(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN) &&
1579 ((ios->timing == MMC_TIMING_UHS_SDR12) ||
1580 (ios->timing == MMC_TIMING_UHS_SDR25) ||
1581 (ios->timing == MMC_TIMING_UHS_SDR50) ||
1582 (ios->timing == MMC_TIMING_UHS_SDR104) ||
1583 (ios->timing == MMC_TIMING_UHS_DDR50))) {
1584 u16 preset;
1585
1586 sdhci_enable_preset_value(host, true);
1587 preset = sdhci_get_preset_value(host);
1588 ios->drv_type = (preset & SDHCI_PRESET_DRV_MASK)
1589 >> SDHCI_PRESET_DRV_SHIFT;
1590 }
1591
1592 /* Re-enable SD Clock */
1593 sdhci_update_clock(host);
1594 } else
1595 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1596
1597 /*
1598 * Some (ENE) controllers go apeshit on some ios operation,
1599 * signalling timeout and CRC errors even on CMD0. Resetting
1600 * it on each ios seems to solve the problem.
1601 */
1602 if(host->quirks & SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS)
1603 sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
1604
1605 mmiowb();
1606 spin_unlock_irqrestore(&host->lock, flags);
1607}
1608
1609static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1610{
1611 struct sdhci_host *host = mmc_priv(mmc);
1612
1613 sdhci_runtime_pm_get(host);
1614 sdhci_do_set_ios(host, ios);
1615 sdhci_runtime_pm_put(host);
1616}
1617
1618static int sdhci_do_get_cd(struct sdhci_host *host)
1619{
1620 int gpio_cd = mmc_gpio_get_cd(host->mmc);
1621
1622 if (host->flags & SDHCI_DEVICE_DEAD)
1623 return 0;
1624
1625 /* If polling/nonremovable, assume that the card is always present. */
1626 if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) ||
1627 (host->mmc->caps & MMC_CAP_NONREMOVABLE))
1628 return 1;
1629
1630 /* Try slot gpio detect */
1631 if (!IS_ERR_VALUE(gpio_cd))
1632 return !!gpio_cd;
1633
1634 /* Host native card detect */
1635 return !!(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT);
1636}
1637
1638static int sdhci_get_cd(struct mmc_host *mmc)
1639{
1640 struct sdhci_host *host = mmc_priv(mmc);
1641 int ret;
1642
1643 sdhci_runtime_pm_get(host);
1644 ret = sdhci_do_get_cd(host);
1645 sdhci_runtime_pm_put(host);
1646 return ret;
1647}
1648
1649static int sdhci_check_ro(struct sdhci_host *host)
1650{
1651 unsigned long flags;
1652 int is_readonly;
1653
1654 spin_lock_irqsave(&host->lock, flags);
1655
1656 if (host->flags & SDHCI_DEVICE_DEAD)
1657 is_readonly = 0;
1658 else if (host->ops->get_ro)
1659 is_readonly = host->ops->get_ro(host);
1660 else
1661 is_readonly = !(sdhci_readl(host, SDHCI_PRESENT_STATE)
1662 & SDHCI_WRITE_PROTECT);
1663
1664 spin_unlock_irqrestore(&host->lock, flags);
1665
1666 /* This quirk needs to be replaced by a callback-function later */
1667 return host->quirks & SDHCI_QUIRK_INVERTED_WRITE_PROTECT ?
1668 !is_readonly : is_readonly;
1669}
1670
1671#define SAMPLE_COUNT 5
1672
1673static int sdhci_do_get_ro(struct sdhci_host *host)
1674{
1675 int i, ro_count;
1676
1677 if (!(host->quirks & SDHCI_QUIRK_UNSTABLE_RO_DETECT))
1678 return sdhci_check_ro(host);
1679
1680 ro_count = 0;
1681 for (i = 0; i < SAMPLE_COUNT; i++) {
1682 if (sdhci_check_ro(host)) {
1683 if (++ro_count > SAMPLE_COUNT / 2)
1684 return 1;
1685 }
1686 msleep(30);
1687 }
1688 return 0;
1689}
1690
1691static void sdhci_hw_reset(struct mmc_host *mmc)
1692{
1693 struct sdhci_host *host = mmc_priv(mmc);
1694
1695 if (host->ops && host->ops->hw_reset)
1696 host->ops->hw_reset(host);
1697}
1698
1699static int sdhci_get_ro(struct mmc_host *mmc)
1700{
1701 struct sdhci_host *host = mmc_priv(mmc);
1702 int ret;
1703
1704 sdhci_runtime_pm_get(host);
1705 ret = sdhci_do_get_ro(host);
1706 sdhci_runtime_pm_put(host);
1707 return ret;
1708}
1709
1710static void sdhci_enable_sdio_irq_nolock(struct sdhci_host *host, int enable)
1711{
1712 if (host->flags & SDHCI_DEVICE_DEAD)
1713 goto out;
1714
1715 if (enable)
1716 host->flags |= SDHCI_SDIO_IRQ_ENABLED;
1717 else
1718 host->flags &= ~SDHCI_SDIO_IRQ_ENABLED;
1719
1720 /* SDIO IRQ will be enabled as appropriate in runtime resume */
1721 if (host->runtime_suspended)
1722 goto out;
1723
1724 if (enable)
1725 sdhci_unmask_irqs(host, SDHCI_INT_CARD_INT);
1726 else
1727 sdhci_mask_irqs(host, SDHCI_INT_CARD_INT);
1728out:
1729 mmiowb();
1730}
1731
1732static void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable)
1733{
1734 struct sdhci_host *host = mmc_priv(mmc);
1735 unsigned long flags;
1736
1737 spin_lock_irqsave(&host->lock, flags);
1738 sdhci_enable_sdio_irq_nolock(host, enable);
1739 spin_unlock_irqrestore(&host->lock, flags);
1740}
1741
1742static int sdhci_do_start_signal_voltage_switch(struct sdhci_host *host,
1743 struct mmc_ios *ios)
1744{
1745 u16 ctrl;
1746 int ret;
1747
1748 /*
1749 * Signal Voltage Switching is only applicable for Host Controllers
1750 * v3.00 and above.
1751 */
1752 if (host->version < SDHCI_SPEC_300)
1753 return 0;
1754
1755 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1756
1757 switch (ios->signal_voltage) {
1758 case MMC_SIGNAL_VOLTAGE_330:
1759 /* Set 1.8V Signal Enable in the Host Control2 register to 0 */
1760 ctrl &= ~SDHCI_CTRL_VDD_180;
1761 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1762
1763 if (host->vqmmc) {
1764 ret = regulator_set_voltage(host->vqmmc, 2700000, 3600000);
1765 if (ret) {
1766 pr_warning("%s: Switching to 3.3V signalling voltage "
1767 " failed\n", mmc_hostname(host->mmc));
1768 return -EIO;
1769 }
1770 }
1771 /* Wait for 5ms */
1772 usleep_range(5000, 5500);
1773
1774 /* 3.3V regulator output should be stable within 5 ms */
1775 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1776 if (!(ctrl & SDHCI_CTRL_VDD_180))
1777 return 0;
1778
1779 pr_warning("%s: 3.3V regulator output did not became stable\n",
1780 mmc_hostname(host->mmc));
1781
1782 return -EAGAIN;
1783 case MMC_SIGNAL_VOLTAGE_180:
1784 if (host->vqmmc) {
1785 ret = regulator_set_voltage(host->vqmmc,
1786 1700000, 1950000);
1787 if (ret) {
1788 pr_warning("%s: Switching to 1.8V signalling voltage "
1789 " failed\n", mmc_hostname(host->mmc));
1790 return -EIO;
1791 }
1792 }
1793
1794 /*
1795 * Enable 1.8V Signal Enable in the Host Control2
1796 * register
1797 */
1798 ctrl |= SDHCI_CTRL_VDD_180;
1799 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1800
1801 /* Wait for 5ms */
1802 usleep_range(5000, 5500);
1803
1804 /* 1.8V regulator output should be stable within 5 ms */
1805 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1806 if (ctrl & SDHCI_CTRL_VDD_180)
1807 return 0;
1808
1809 pr_warning("%s: 1.8V regulator output did not became stable\n",
1810 mmc_hostname(host->mmc));
1811
1812 return -EAGAIN;
1813 case MMC_SIGNAL_VOLTAGE_120:
1814 if (host->vqmmc) {
1815 ret = regulator_set_voltage(host->vqmmc, 1100000, 1300000);
1816 if (ret) {
1817 pr_warning("%s: Switching to 1.2V signalling voltage "
1818 " failed\n", mmc_hostname(host->mmc));
1819 return -EIO;
1820 }
1821 }
1822 return 0;
1823 default:
1824 /* No signal voltage switch required */
1825 return 0;
1826 }
1827}
1828
1829static int sdhci_start_signal_voltage_switch(struct mmc_host *mmc,
1830 struct mmc_ios *ios)
1831{
1832 struct sdhci_host *host = mmc_priv(mmc);
1833 int err;
1834
1835 if (host->version < SDHCI_SPEC_300)
1836 return 0;
1837 sdhci_runtime_pm_get(host);
1838 err = sdhci_do_start_signal_voltage_switch(host, ios);
1839 sdhci_runtime_pm_put(host);
1840 return err;
1841}
1842
1843static int sdhci_card_busy(struct mmc_host *mmc)
1844{
1845 struct sdhci_host *host = mmc_priv(mmc);
1846 u32 present_state;
1847
1848 sdhci_runtime_pm_get(host);
1849 /* Check whether DAT[3:0] is 0000 */
1850 present_state = sdhci_readl(host, SDHCI_PRESENT_STATE);
1851 sdhci_runtime_pm_put(host);
1852
1853 return !(present_state & SDHCI_DATA_LVL_MASK);
1854}
1855
1856static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
1857{
1858 struct sdhci_host *host;
1859 u16 ctrl;
1860 u32 ier;
1861 int tuning_loop_counter = MAX_TUNING_LOOP;
1862 unsigned long timeout;
1863 int err = 0;
1864 bool requires_tuning_nonuhs = false;
1865 unsigned long flags;
1866
1867 host = mmc_priv(mmc);
1868
1869 sdhci_runtime_pm_get(host);
1870 spin_lock_irqsave(&host->lock, flags);
1871
1872 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1873
1874 /*
1875 * The Host Controller needs tuning only in case of SDR104 mode
1876 * and for SDR50 mode when Use Tuning for SDR50 is set in the
1877 * Capabilities register.
1878 * If the Host Controller supports the HS200 mode then the
1879 * tuning function has to be executed.
1880 */
1881 if (((ctrl & SDHCI_CTRL_UHS_MASK) == SDHCI_CTRL_UHS_SDR50) &&
1882 (host->flags & SDHCI_SDR50_NEEDS_TUNING ||
1883 host->flags & SDHCI_SDR104_NEEDS_TUNING))
1884 requires_tuning_nonuhs = true;
1885
1886 if (((ctrl & SDHCI_CTRL_UHS_MASK) == SDHCI_CTRL_UHS_SDR104) ||
1887 requires_tuning_nonuhs)
1888 ctrl |= SDHCI_CTRL_EXEC_TUNING;
1889 else {
1890 spin_unlock_irqrestore(&host->lock, flags);
1891 sdhci_runtime_pm_put(host);
1892 return 0;
1893 }
1894
1895 if (host->ops->platform_execute_tuning) {
1896 spin_unlock_irqrestore(&host->lock, flags);
1897 err = host->ops->platform_execute_tuning(host, opcode);
1898 sdhci_runtime_pm_put(host);
1899 return err;
1900 }
1901
1902 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1903
1904 /*
1905 * As per the Host Controller spec v3.00, tuning command
1906 * generates Buffer Read Ready interrupt, so enable that.
1907 *
1908 * Note: The spec clearly says that when tuning sequence
1909 * is being performed, the controller does not generate
1910 * interrupts other than Buffer Read Ready interrupt. But
1911 * to make sure we don't hit a controller bug, we _only_
1912 * enable Buffer Read Ready interrupt here.
1913 */
1914 ier = sdhci_readl(host, SDHCI_INT_ENABLE);
1915 sdhci_clear_set_irqs(host, ier, SDHCI_INT_DATA_AVAIL);
1916
1917 /*
1918 * Issue CMD19 repeatedly till Execute Tuning is set to 0 or the number
1919 * of loops reaches 40 times or a timeout of 150ms occurs.
1920 */
1921 timeout = 150;
1922 do {
1923 struct mmc_command cmd = {0};
1924 struct mmc_request mrq = {NULL};
1925
1926 if (!tuning_loop_counter && !timeout)
1927 break;
1928
1929 cmd.opcode = opcode;
1930 cmd.arg = 0;
1931 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
1932 cmd.retries = 0;
1933 cmd.data = NULL;
1934 cmd.error = 0;
1935
1936 mrq.cmd = &cmd;
1937 host->mrq = &mrq;
1938
1939 /*
1940 * In response to CMD19, the card sends 64 bytes of tuning
1941 * block to the Host Controller. So we set the block size
1942 * to 64 here.
1943 */
1944 if (cmd.opcode == MMC_SEND_TUNING_BLOCK_HS200) {
1945 if (mmc->ios.bus_width == MMC_BUS_WIDTH_8)
1946 sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, 128),
1947 SDHCI_BLOCK_SIZE);
1948 else if (mmc->ios.bus_width == MMC_BUS_WIDTH_4)
1949 sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, 64),
1950 SDHCI_BLOCK_SIZE);
1951 } else {
1952 sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, 64),
1953 SDHCI_BLOCK_SIZE);
1954 }
1955
1956 /*
1957 * The tuning block is sent by the card to the host controller.
1958 * So we set the TRNS_READ bit in the Transfer Mode register.
1959 * This also takes care of setting DMA Enable and Multi Block
1960 * Select in the same register to 0.
1961 */
1962 sdhci_writew(host, SDHCI_TRNS_READ, SDHCI_TRANSFER_MODE);
1963
1964 sdhci_send_command(host, &cmd);
1965
1966 host->cmd = NULL;
1967 host->mrq = NULL;
1968
1969 spin_unlock_irqrestore(&host->lock, flags);
1970 /* Wait for Buffer Read Ready interrupt */
1971 wait_event_interruptible_timeout(host->buf_ready_int,
1972 (host->tuning_done == 1),
1973 msecs_to_jiffies(50));
1974 spin_lock_irqsave(&host->lock, flags);
1975
1976 if (!host->tuning_done) {
1977 pr_info(DRIVER_NAME ": Timeout waiting for "
1978 "Buffer Read Ready interrupt during tuning "
1979 "procedure, falling back to fixed sampling "
1980 "clock\n");
1981 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1982 ctrl &= ~SDHCI_CTRL_TUNED_CLK;
1983 ctrl &= ~SDHCI_CTRL_EXEC_TUNING;
1984 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1985
1986 err = -EIO;
1987 goto out;
1988 }
1989
1990 host->tuning_done = 0;
1991
1992 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1993 tuning_loop_counter--;
1994 timeout--;
1995 mdelay(1);
1996 } while (ctrl & SDHCI_CTRL_EXEC_TUNING);
1997
1998 /*
1999 * The Host Driver has exhausted the maximum number of loops allowed,
2000 * so use fixed sampling frequency.
2001 */
2002 if (!tuning_loop_counter || !timeout) {
2003 ctrl &= ~SDHCI_CTRL_TUNED_CLK;
2004 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2005 err = -EIO;
2006 } else {
2007 if (!(ctrl & SDHCI_CTRL_TUNED_CLK)) {
2008 pr_info(DRIVER_NAME ": Tuning procedure"
2009 " failed, falling back to fixed sampling"
2010 " clock\n");
2011 err = -EIO;
2012 }
2013 }
2014
2015out:
2016 /*
2017 * If this is the very first time we are here, we start the retuning
2018 * timer. Since only during the first time, SDHCI_NEEDS_RETUNING
2019 * flag won't be set, we check this condition before actually starting
2020 * the timer.
2021 */
2022 if (!(host->flags & SDHCI_NEEDS_RETUNING) && host->tuning_count &&
2023 (host->tuning_mode == SDHCI_TUNING_MODE_1)) {
2024 host->flags |= SDHCI_USING_RETUNING_TIMER;
2025 mod_timer(&host->tuning_timer, jiffies +
2026 host->tuning_count * HZ);
2027 /* Tuning mode 1 limits the maximum data length to 4MB */
2028 mmc->max_blk_count = (4 * 1024 * 1024) / mmc->max_blk_size;
2029 } else if (host->flags & SDHCI_USING_RETUNING_TIMER) {
2030 host->flags &= ~SDHCI_NEEDS_RETUNING;
2031 /* Reload the new initial value for timer */
2032 mod_timer(&host->tuning_timer, jiffies +
2033 host->tuning_count * HZ);
2034 }
2035
2036 /*
2037 * In case tuning fails, host controllers which support re-tuning can
2038 * try tuning again at a later time, when the re-tuning timer expires.
2039 * So for these controllers, we return 0. Since there might be other
2040 * controllers who do not have this capability, we return error for
2041 * them. SDHCI_USING_RETUNING_TIMER means the host is currently using
2042 * a retuning timer to do the retuning for the card.
2043 */
2044 if (err && (host->flags & SDHCI_USING_RETUNING_TIMER))
2045 err = 0;
2046
2047 sdhci_clear_set_irqs(host, SDHCI_INT_DATA_AVAIL, ier);
2048 spin_unlock_irqrestore(&host->lock, flags);
2049 sdhci_runtime_pm_put(host);
2050
2051 return err;
2052}
2053
2054
2055static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable)
2056{
2057 u16 ctrl;
2058
2059 /* Host Controller v3.00 defines preset value registers */
2060 if (host->version < SDHCI_SPEC_300)
2061 return;
2062
2063 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2064
2065 /*
2066 * We only enable or disable Preset Value if they are not already
2067 * enabled or disabled respectively. Otherwise, we bail out.
2068 */
2069 if (enable && !(ctrl & SDHCI_CTRL_PRESET_VAL_ENABLE)) {
2070 ctrl |= SDHCI_CTRL_PRESET_VAL_ENABLE;
2071 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2072 host->flags |= SDHCI_PV_ENABLED;
2073 } else if (!enable && (ctrl & SDHCI_CTRL_PRESET_VAL_ENABLE)) {
2074 ctrl &= ~SDHCI_CTRL_PRESET_VAL_ENABLE;
2075 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2076 host->flags &= ~SDHCI_PV_ENABLED;
2077 }
2078}
2079
2080static void sdhci_card_event(struct mmc_host *mmc)
2081{
2082 struct sdhci_host *host = mmc_priv(mmc);
2083 unsigned long flags;
2084
2085 /* First check if client has provided their own card event */
2086 if (host->ops->card_event)
2087 host->ops->card_event(host);
2088
2089 spin_lock_irqsave(&host->lock, flags);
2090
2091 /* Check host->mrq first in case we are runtime suspended */
2092 if (host->mrq && !sdhci_do_get_cd(host)) {
2093 pr_err("%s: Card removed during transfer!\n",
2094 mmc_hostname(host->mmc));
2095 pr_err("%s: Resetting controller.\n",
2096 mmc_hostname(host->mmc));
2097
2098 sdhci_reset(host, SDHCI_RESET_CMD);
2099 sdhci_reset(host, SDHCI_RESET_DATA);
2100
2101 host->mrq->cmd->error = -ENOMEDIUM;
2102 tasklet_schedule(&host->finish_tasklet);
2103 }
2104
2105 spin_unlock_irqrestore(&host->lock, flags);
2106}
2107
2108static const struct mmc_host_ops sdhci_ops = {
2109 .request = sdhci_request,
2110 .set_ios = sdhci_set_ios,
2111 .get_cd = sdhci_get_cd,
2112 .get_ro = sdhci_get_ro,
2113 .hw_reset = sdhci_hw_reset,
2114 .enable_sdio_irq = sdhci_enable_sdio_irq,
2115 .start_signal_voltage_switch = sdhci_start_signal_voltage_switch,
2116 .execute_tuning = sdhci_execute_tuning,
2117 .card_event = sdhci_card_event,
2118 .card_busy = sdhci_card_busy,
2119};
2120
2121/*****************************************************************************\
2122 * *
2123 * Tasklets *
2124 * *
2125\*****************************************************************************/
2126
2127static void sdhci_tasklet_card(unsigned long param)
2128{
2129 struct sdhci_host *host = (struct sdhci_host*)param;
2130
2131 sdhci_card_event(host->mmc);
2132
2133 mmc_detect_change(host->mmc, msecs_to_jiffies(200));
2134}
2135
2136static void sdhci_tasklet_finish(unsigned long param)
2137{
2138 struct sdhci_host *host;
2139 unsigned long flags;
2140 struct mmc_request *mrq;
2141
2142 host = (struct sdhci_host*)param;
2143
2144 spin_lock_irqsave(&host->lock, flags);
2145
2146 /*
2147 * If this tasklet gets rescheduled while running, it will
2148 * be run again afterwards but without any active request.
2149 */
2150 if (!host->mrq) {
2151 spin_unlock_irqrestore(&host->lock, flags);
2152 return;
2153 }
2154
2155 del_timer(&host->timer);
2156
2157 mrq = host->mrq;
2158
2159 /*
2160 * The controller needs a reset of internal state machines
2161 * upon error conditions.
2162 */
2163 if (!(host->flags & SDHCI_DEVICE_DEAD) &&
2164 ((mrq->cmd && mrq->cmd->error) ||
2165 (mrq->data && (mrq->data->error ||
2166 (mrq->data->stop && mrq->data->stop->error))) ||
2167 (host->quirks & SDHCI_QUIRK_RESET_AFTER_REQUEST))) {
2168
2169 /* Some controllers need this kick or reset won't work here */
2170 if (host->quirks & SDHCI_QUIRK_CLOCK_BEFORE_RESET)
2171 /* This is to force an update */
2172 sdhci_update_clock(host);
2173
2174 /* Spec says we should do both at the same time, but Ricoh
2175 controllers do not like that. */
2176 sdhci_reset(host, SDHCI_RESET_CMD);
2177 sdhci_reset(host, SDHCI_RESET_DATA);
2178 }
2179
2180 host->mrq = NULL;
2181 host->cmd = NULL;
2182 host->data = NULL;
2183
2184#ifndef SDHCI_USE_LEDS_CLASS
2185 sdhci_deactivate_led(host);
2186#endif
2187
2188 mmiowb();
2189 spin_unlock_irqrestore(&host->lock, flags);
2190
2191 mmc_request_done(host->mmc, mrq);
2192 sdhci_runtime_pm_put(host);
2193}
2194
2195static void sdhci_timeout_timer(unsigned long data)
2196{
2197 struct sdhci_host *host;
2198 unsigned long flags;
2199
2200 host = (struct sdhci_host*)data;
2201
2202 spin_lock_irqsave(&host->lock, flags);
2203
2204 if (host->mrq) {
2205 pr_err("%s: Timeout waiting for hardware "
2206 "interrupt.\n", mmc_hostname(host->mmc));
2207 sdhci_dumpregs(host);
2208
2209 if (host->data) {
2210 host->data->error = -ETIMEDOUT;
2211 sdhci_finish_data(host);
2212 } else {
2213 if (host->cmd)
2214 host->cmd->error = -ETIMEDOUT;
2215 else
2216 host->mrq->cmd->error = -ETIMEDOUT;
2217
2218 tasklet_schedule(&host->finish_tasklet);
2219 }
2220 }
2221
2222 mmiowb();
2223 spin_unlock_irqrestore(&host->lock, flags);
2224}
2225
2226static void sdhci_tuning_timer(unsigned long data)
2227{
2228 struct sdhci_host *host;
2229 unsigned long flags;
2230
2231 host = (struct sdhci_host *)data;
2232
2233 spin_lock_irqsave(&host->lock, flags);
2234
2235 host->flags |= SDHCI_NEEDS_RETUNING;
2236
2237 spin_unlock_irqrestore(&host->lock, flags);
2238}
2239
2240/*****************************************************************************\
2241 * *
2242 * Interrupt handling *
2243 * *
2244\*****************************************************************************/
2245
2246static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask)
2247{
2248 BUG_ON(intmask == 0);
2249
2250 if (!host->cmd) {
2251 pr_err("%s: Got command interrupt 0x%08x even "
2252 "though no command operation was in progress.\n",
2253 mmc_hostname(host->mmc), (unsigned)intmask);
2254 sdhci_dumpregs(host);
2255 return;
2256 }
2257
2258 if (intmask & SDHCI_INT_TIMEOUT)
2259 host->cmd->error = -ETIMEDOUT;
2260 else if (intmask & (SDHCI_INT_CRC | SDHCI_INT_END_BIT |
2261 SDHCI_INT_INDEX))
2262 host->cmd->error = -EILSEQ;
2263
2264 if (host->cmd->error) {
2265 tasklet_schedule(&host->finish_tasklet);
2266 return;
2267 }
2268
2269 /*
2270 * The host can send and interrupt when the busy state has
2271 * ended, allowing us to wait without wasting CPU cycles.
2272 * Unfortunately this is overloaded on the "data complete"
2273 * interrupt, so we need to take some care when handling
2274 * it.
2275 *
2276 * Note: The 1.0 specification is a bit ambiguous about this
2277 * feature so there might be some problems with older
2278 * controllers.
2279 */
2280 if (host->cmd->flags & MMC_RSP_BUSY) {
2281 if (host->cmd->data)
2282 DBG("Cannot wait for busy signal when also "
2283 "doing a data transfer");
2284 else if (!(host->quirks & SDHCI_QUIRK_NO_BUSY_IRQ))
2285 return;
2286
2287 /* The controller does not support the end-of-busy IRQ,
2288 * fall through and take the SDHCI_INT_RESPONSE */
2289 }
2290
2291 if (intmask & SDHCI_INT_RESPONSE)
2292 sdhci_finish_command(host);
2293}
2294
2295#ifdef CONFIG_MMC_DEBUG
2296static void sdhci_show_adma_error(struct sdhci_host *host)
2297{
2298 const char *name = mmc_hostname(host->mmc);
2299 u8 *desc = host->adma_desc;
2300 __le32 *dma;
2301 __le16 *len;
2302 u8 attr;
2303
2304 sdhci_dumpregs(host);
2305
2306 while (true) {
2307 dma = (__le32 *)(desc + 4);
2308 len = (__le16 *)(desc + 2);
2309 attr = *desc;
2310
2311 DBG("%s: %p: DMA 0x%08x, LEN 0x%04x, Attr=0x%02x\n",
2312 name, desc, le32_to_cpu(*dma), le16_to_cpu(*len), attr);
2313
2314 desc += 8;
2315
2316 if (attr & 2)
2317 break;
2318 }
2319}
2320#else
2321static void sdhci_show_adma_error(struct sdhci_host *host) { }
2322#endif
2323
2324static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
2325{
2326 u32 command;
2327 BUG_ON(intmask == 0);
2328
2329 /* CMD19 generates _only_ Buffer Read Ready interrupt */
2330 if (intmask & SDHCI_INT_DATA_AVAIL) {
2331 command = SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND));
2332 if (command == MMC_SEND_TUNING_BLOCK ||
2333 command == MMC_SEND_TUNING_BLOCK_HS200) {
2334 host->tuning_done = 1;
2335 wake_up(&host->buf_ready_int);
2336 return;
2337 }
2338 }
2339
2340 if (!host->data) {
2341 /*
2342 * The "data complete" interrupt is also used to
2343 * indicate that a busy state has ended. See comment
2344 * above in sdhci_cmd_irq().
2345 */
2346 if (host->cmd && (host->cmd->flags & MMC_RSP_BUSY)) {
2347 if (intmask & SDHCI_INT_DATA_END) {
2348 sdhci_finish_command(host);
2349 return;
2350 }
2351 }
2352
2353 pr_err("%s: Got data interrupt 0x%08x even "
2354 "though no data operation was in progress.\n",
2355 mmc_hostname(host->mmc), (unsigned)intmask);
2356 sdhci_dumpregs(host);
2357
2358 return;
2359 }
2360
2361 if (intmask & SDHCI_INT_DATA_TIMEOUT)
2362 host->data->error = -ETIMEDOUT;
2363 else if (intmask & SDHCI_INT_DATA_END_BIT)
2364 host->data->error = -EILSEQ;
2365 else if ((intmask & SDHCI_INT_DATA_CRC) &&
2366 SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND))
2367 != MMC_BUS_TEST_R)
2368 host->data->error = -EILSEQ;
2369 else if (intmask & SDHCI_INT_ADMA_ERROR) {
2370 pr_err("%s: ADMA error\n", mmc_hostname(host->mmc));
2371 sdhci_show_adma_error(host);
2372 host->data->error = -EIO;
2373 if (host->ops->adma_workaround)
2374 host->ops->adma_workaround(host, intmask);
2375 }
2376
2377 if (host->data->error)
2378 sdhci_finish_data(host);
2379 else {
2380 if (intmask & (SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL))
2381 sdhci_transfer_pio(host);
2382
2383 /*
2384 * We currently don't do anything fancy with DMA
2385 * boundaries, but as we can't disable the feature
2386 * we need to at least restart the transfer.
2387 *
2388 * According to the spec sdhci_readl(host, SDHCI_DMA_ADDRESS)
2389 * should return a valid address to continue from, but as
2390 * some controllers are faulty, don't trust them.
2391 */
2392 if (intmask & SDHCI_INT_DMA_END) {
2393 u32 dmastart, dmanow;
2394 dmastart = sg_dma_address(host->data->sg);
2395 dmanow = dmastart + host->data->bytes_xfered;
2396 /*
2397 * Force update to the next DMA block boundary.
2398 */
2399 dmanow = (dmanow &
2400 ~(SDHCI_DEFAULT_BOUNDARY_SIZE - 1)) +
2401 SDHCI_DEFAULT_BOUNDARY_SIZE;
2402 host->data->bytes_xfered = dmanow - dmastart;
2403 DBG("%s: DMA base 0x%08x, transferred 0x%06x bytes,"
2404 " next 0x%08x\n",
2405 mmc_hostname(host->mmc), dmastart,
2406 host->data->bytes_xfered, dmanow);
2407 sdhci_writel(host, dmanow, SDHCI_DMA_ADDRESS);
2408 }
2409
2410 if (intmask & SDHCI_INT_DATA_END) {
2411 if (host->cmd) {
2412 /*
2413 * Data managed to finish before the
2414 * command completed. Make sure we do
2415 * things in the proper order.
2416 */
2417 host->data_early = 1;
2418 } else {
2419 sdhci_finish_data(host);
2420 }
2421 }
2422 }
2423}
2424
2425static irqreturn_t sdhci_irq(int irq, void *dev_id)
2426{
2427 irqreturn_t result;
2428 struct sdhci_host *host = dev_id;
2429 u32 intmask, unexpected = 0;
2430 int cardint = 0, max_loops = 16;
2431
2432 spin_lock(&host->lock);
2433
2434 if (host->runtime_suspended) {
2435 spin_unlock(&host->lock);
2436 return IRQ_NONE;
2437 }
2438
2439 intmask = sdhci_readl(host, SDHCI_INT_STATUS);
2440
2441 if (!intmask || intmask == 0xffffffff) {
2442 result = IRQ_NONE;
2443 goto out;
2444 }
2445
2446again:
2447 DBG("*** %s got interrupt: 0x%08x\n",
2448 mmc_hostname(host->mmc), intmask);
2449
2450 if (intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
2451 u32 present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
2452 SDHCI_CARD_PRESENT;
2453
2454 /*
2455 * There is a observation on i.mx esdhc. INSERT bit will be
2456 * immediately set again when it gets cleared, if a card is
2457 * inserted. We have to mask the irq to prevent interrupt
2458 * storm which will freeze the system. And the REMOVE gets
2459 * the same situation.
2460 *
2461 * More testing are needed here to ensure it works for other
2462 * platforms though.
2463 */
2464 sdhci_mask_irqs(host, present ? SDHCI_INT_CARD_INSERT :
2465 SDHCI_INT_CARD_REMOVE);
2466 sdhci_unmask_irqs(host, present ? SDHCI_INT_CARD_REMOVE :
2467 SDHCI_INT_CARD_INSERT);
2468
2469 sdhci_writel(host, intmask & (SDHCI_INT_CARD_INSERT |
2470 SDHCI_INT_CARD_REMOVE), SDHCI_INT_STATUS);
2471 intmask &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE);
2472 tasklet_schedule(&host->card_tasklet);
2473 }
2474
2475 if (intmask & SDHCI_INT_CMD_MASK) {
2476 sdhci_writel(host, intmask & SDHCI_INT_CMD_MASK,
2477 SDHCI_INT_STATUS);
2478 sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK);
2479 }
2480
2481 if (intmask & SDHCI_INT_DATA_MASK) {
2482 sdhci_writel(host, intmask & SDHCI_INT_DATA_MASK,
2483 SDHCI_INT_STATUS);
2484 sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK);
2485 }
2486
2487 intmask &= ~(SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK);
2488
2489 intmask &= ~SDHCI_INT_ERROR;
2490
2491 if (intmask & SDHCI_INT_BUS_POWER) {
2492 pr_err("%s: Card is consuming too much power!\n",
2493 mmc_hostname(host->mmc));
2494 sdhci_writel(host, SDHCI_INT_BUS_POWER, SDHCI_INT_STATUS);
2495 }
2496
2497 intmask &= ~SDHCI_INT_BUS_POWER;
2498
2499 if (intmask & SDHCI_INT_CARD_INT)
2500 cardint = 1;
2501
2502 intmask &= ~SDHCI_INT_CARD_INT;
2503
2504 if (intmask) {
2505 unexpected |= intmask;
2506 sdhci_writel(host, intmask, SDHCI_INT_STATUS);
2507 }
2508
2509 result = IRQ_HANDLED;
2510
2511 intmask = sdhci_readl(host, SDHCI_INT_STATUS);
2512
2513 /*
2514 * If we know we'll call the driver to signal SDIO IRQ, disregard
2515 * further indications of Card Interrupt in the status to avoid a
2516 * needless loop.
2517 */
2518 if (cardint)
2519 intmask &= ~SDHCI_INT_CARD_INT;
2520 if (intmask && --max_loops)
2521 goto again;
2522out:
2523 spin_unlock(&host->lock);
2524
2525 if (unexpected) {
2526 pr_err("%s: Unexpected interrupt 0x%08x.\n",
2527 mmc_hostname(host->mmc), unexpected);
2528 sdhci_dumpregs(host);
2529 }
2530 /*
2531 * We have to delay this as it calls back into the driver.
2532 */
2533 if (cardint)
2534 mmc_signal_sdio_irq(host->mmc);
2535
2536 return result;
2537}
2538
2539/*****************************************************************************\
2540 * *
2541 * Suspend/resume *
2542 * *
2543\*****************************************************************************/
2544
2545#ifdef CONFIG_PM
2546void sdhci_enable_irq_wakeups(struct sdhci_host *host)
2547{
2548 u8 val;
2549 u8 mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE
2550 | SDHCI_WAKE_ON_INT;
2551
2552 val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
2553 val |= mask ;
2554 /* Avoid fake wake up */
2555 if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
2556 val &= ~(SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE);
2557 sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
2558}
2559EXPORT_SYMBOL_GPL(sdhci_enable_irq_wakeups);
2560
2561void sdhci_disable_irq_wakeups(struct sdhci_host *host)
2562{
2563 u8 val;
2564 u8 mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE
2565 | SDHCI_WAKE_ON_INT;
2566
2567 val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
2568 val &= ~mask;
2569 sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
2570}
2571EXPORT_SYMBOL_GPL(sdhci_disable_irq_wakeups);
2572
2573int sdhci_suspend_host(struct sdhci_host *host)
2574{
2575 if (host->ops->platform_suspend)
2576 host->ops->platform_suspend(host);
2577
2578 sdhci_disable_card_detection(host);
2579
2580 /* Disable tuning since we are suspending */
2581 if (host->flags & SDHCI_USING_RETUNING_TIMER) {
2582 del_timer_sync(&host->tuning_timer);
2583 host->flags &= ~SDHCI_NEEDS_RETUNING;
2584 }
2585
2586 if (!device_may_wakeup(mmc_dev(host->mmc))) {
2587 sdhci_mask_irqs(host, SDHCI_INT_ALL_MASK);
2588 free_irq(host->irq, host);
2589 } else {
2590 sdhci_enable_irq_wakeups(host);
2591 enable_irq_wake(host->irq);
2592 }
2593 return 0;
2594}
2595
2596EXPORT_SYMBOL_GPL(sdhci_suspend_host);
2597
2598int sdhci_resume_host(struct sdhci_host *host)
2599{
2600 int ret = 0;
2601
2602 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
2603 if (host->ops->enable_dma)
2604 host->ops->enable_dma(host);
2605 }
2606
2607 if (!device_may_wakeup(mmc_dev(host->mmc))) {
2608 ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED,
2609 mmc_hostname(host->mmc), host);
2610 if (ret)
2611 return ret;
2612 } else {
2613 sdhci_disable_irq_wakeups(host);
2614 disable_irq_wake(host->irq);
2615 }
2616
2617 if ((host->mmc->pm_flags & MMC_PM_KEEP_POWER) &&
2618 (host->quirks2 & SDHCI_QUIRK2_HOST_OFF_CARD_ON)) {
2619 /* Card keeps power but host controller does not */
2620 sdhci_init(host, 0);
2621 host->pwr = 0;
2622 host->clock = 0;
2623 sdhci_do_set_ios(host, &host->mmc->ios);
2624 } else {
2625 sdhci_init(host, (host->mmc->pm_flags & MMC_PM_KEEP_POWER));
2626 mmiowb();
2627 }
2628
2629 sdhci_enable_card_detection(host);
2630
2631 if (host->ops->platform_resume)
2632 host->ops->platform_resume(host);
2633
2634 /* Set the re-tuning expiration flag */
2635 if (host->flags & SDHCI_USING_RETUNING_TIMER)
2636 host->flags |= SDHCI_NEEDS_RETUNING;
2637
2638 return ret;
2639}
2640
2641EXPORT_SYMBOL_GPL(sdhci_resume_host);
2642#endif /* CONFIG_PM */
2643
2644#ifdef CONFIG_PM_RUNTIME
2645
2646static int sdhci_runtime_pm_get(struct sdhci_host *host)
2647{
2648 return pm_runtime_get_sync(host->mmc->parent);
2649}
2650
2651static int sdhci_runtime_pm_put(struct sdhci_host *host)
2652{
2653 pm_runtime_mark_last_busy(host->mmc->parent);
2654 return pm_runtime_put_autosuspend(host->mmc->parent);
2655}
2656
2657static void sdhci_runtime_pm_bus_on(struct sdhci_host *host)
2658{
2659 if (host->runtime_suspended || host->bus_on)
2660 return;
2661 host->bus_on = true;
2662 pm_runtime_get_noresume(host->mmc->parent);
2663}
2664
2665static void sdhci_runtime_pm_bus_off(struct sdhci_host *host)
2666{
2667 if (host->runtime_suspended || !host->bus_on)
2668 return;
2669 host->bus_on = false;
2670 pm_runtime_put_noidle(host->mmc->parent);
2671}
2672
2673int sdhci_runtime_suspend_host(struct sdhci_host *host)
2674{
2675 unsigned long flags;
2676 int ret = 0;
2677
2678 /* Disable tuning since we are suspending */
2679 if (host->flags & SDHCI_USING_RETUNING_TIMER) {
2680 del_timer_sync(&host->tuning_timer);
2681 host->flags &= ~SDHCI_NEEDS_RETUNING;
2682 }
2683
2684 spin_lock_irqsave(&host->lock, flags);
2685 sdhci_mask_irqs(host, SDHCI_INT_ALL_MASK);
2686 spin_unlock_irqrestore(&host->lock, flags);
2687
2688 synchronize_irq(host->irq);
2689
2690 spin_lock_irqsave(&host->lock, flags);
2691 host->runtime_suspended = true;
2692 spin_unlock_irqrestore(&host->lock, flags);
2693
2694 return ret;
2695}
2696EXPORT_SYMBOL_GPL(sdhci_runtime_suspend_host);
2697
2698int sdhci_runtime_resume_host(struct sdhci_host *host)
2699{
2700 unsigned long flags;
2701 int ret = 0, host_flags = host->flags;
2702
2703 if (host_flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
2704 if (host->ops->enable_dma)
2705 host->ops->enable_dma(host);
2706 }
2707
2708 sdhci_init(host, 0);
2709
2710 /* Force clock and power re-program */
2711 host->pwr = 0;
2712 host->clock = 0;
2713 sdhci_do_set_ios(host, &host->mmc->ios);
2714
2715 sdhci_do_start_signal_voltage_switch(host, &host->mmc->ios);
2716 if ((host_flags & SDHCI_PV_ENABLED) &&
2717 !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN)) {
2718 spin_lock_irqsave(&host->lock, flags);
2719 sdhci_enable_preset_value(host, true);
2720 spin_unlock_irqrestore(&host->lock, flags);
2721 }
2722
2723 /* Set the re-tuning expiration flag */
2724 if (host->flags & SDHCI_USING_RETUNING_TIMER)
2725 host->flags |= SDHCI_NEEDS_RETUNING;
2726
2727 spin_lock_irqsave(&host->lock, flags);
2728
2729 host->runtime_suspended = false;
2730
2731 /* Enable SDIO IRQ */
2732 if ((host->flags & SDHCI_SDIO_IRQ_ENABLED))
2733 sdhci_enable_sdio_irq_nolock(host, true);
2734
2735 /* Enable Card Detection */
2736 sdhci_enable_card_detection(host);
2737
2738 spin_unlock_irqrestore(&host->lock, flags);
2739
2740 return ret;
2741}
2742EXPORT_SYMBOL_GPL(sdhci_runtime_resume_host);
2743
2744#endif
2745
2746/*****************************************************************************\
2747 * *
2748 * Device allocation/registration *
2749 * *
2750\*****************************************************************************/
2751
2752struct sdhci_host *sdhci_alloc_host(struct device *dev,
2753 size_t priv_size)
2754{
2755 struct mmc_host *mmc;
2756 struct sdhci_host *host;
2757
2758 WARN_ON(dev == NULL);
2759
2760 mmc = mmc_alloc_host(sizeof(struct sdhci_host) + priv_size, dev);
2761 if (!mmc)
2762 return ERR_PTR(-ENOMEM);
2763
2764 host = mmc_priv(mmc);
2765 host->mmc = mmc;
2766
2767 return host;
2768}
2769
2770EXPORT_SYMBOL_GPL(sdhci_alloc_host);
2771
2772int sdhci_add_host(struct sdhci_host *host)
2773{
2774 struct mmc_host *mmc;
2775 u32 caps[2] = {0, 0};
2776 u32 max_current_caps;
2777 unsigned int ocr_avail;
2778 int ret;
2779
2780 WARN_ON(host == NULL);
2781 if (host == NULL)
2782 return -EINVAL;
2783
2784 mmc = host->mmc;
2785
2786 if (debug_quirks)
2787 host->quirks = debug_quirks;
2788 if (debug_quirks2)
2789 host->quirks2 = debug_quirks2;
2790
2791 sdhci_reset(host, SDHCI_RESET_ALL);
2792
2793 host->version = sdhci_readw(host, SDHCI_HOST_VERSION);
2794 host->version = (host->version & SDHCI_SPEC_VER_MASK)
2795 >> SDHCI_SPEC_VER_SHIFT;
2796 if (host->version > SDHCI_SPEC_300) {
2797 pr_err("%s: Unknown controller version (%d). "
2798 "You may experience problems.\n", mmc_hostname(mmc),
2799 host->version);
2800 }
2801
2802 caps[0] = (host->quirks & SDHCI_QUIRK_MISSING_CAPS) ? host->caps :
2803 sdhci_readl(host, SDHCI_CAPABILITIES);
2804
2805 if (host->version >= SDHCI_SPEC_300)
2806 caps[1] = (host->quirks & SDHCI_QUIRK_MISSING_CAPS) ?
2807 host->caps1 :
2808 sdhci_readl(host, SDHCI_CAPABILITIES_1);
2809
2810 if (host->quirks & SDHCI_QUIRK_FORCE_DMA)
2811 host->flags |= SDHCI_USE_SDMA;
2812 else if (!(caps[0] & SDHCI_CAN_DO_SDMA))
2813 DBG("Controller doesn't have SDMA capability\n");
2814 else
2815 host->flags |= SDHCI_USE_SDMA;
2816
2817 if ((host->quirks & SDHCI_QUIRK_BROKEN_DMA) &&
2818 (host->flags & SDHCI_USE_SDMA)) {
2819 DBG("Disabling DMA as it is marked broken\n");
2820 host->flags &= ~SDHCI_USE_SDMA;
2821 }
2822
2823 if ((host->version >= SDHCI_SPEC_200) &&
2824 (caps[0] & SDHCI_CAN_DO_ADMA2))
2825 host->flags |= SDHCI_USE_ADMA;
2826
2827 if ((host->quirks & SDHCI_QUIRK_BROKEN_ADMA) &&
2828 (host->flags & SDHCI_USE_ADMA)) {
2829 DBG("Disabling ADMA as it is marked broken\n");
2830 host->flags &= ~SDHCI_USE_ADMA;
2831 }
2832
2833 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
2834 if (host->ops->enable_dma) {
2835 if (host->ops->enable_dma(host)) {
2836 pr_warning("%s: No suitable DMA "
2837 "available. Falling back to PIO.\n",
2838 mmc_hostname(mmc));
2839 host->flags &=
2840 ~(SDHCI_USE_SDMA | SDHCI_USE_ADMA);
2841 }
2842 }
2843 }
2844
2845 if (host->flags & SDHCI_USE_ADMA) {
2846 /*
2847 * We need to allocate descriptors for all sg entries
2848 * (128) and potentially one alignment transfer for
2849 * each of those entries.
2850 */
2851 host->adma_desc = kmalloc((128 * 2 + 1) * 4, GFP_KERNEL);
2852 host->align_buffer = kmalloc(128 * 4, GFP_KERNEL);
2853 if (!host->adma_desc || !host->align_buffer) {
2854 kfree(host->adma_desc);
2855 kfree(host->align_buffer);
2856 pr_warning("%s: Unable to allocate ADMA "
2857 "buffers. Falling back to standard DMA.\n",
2858 mmc_hostname(mmc));
2859 host->flags &= ~SDHCI_USE_ADMA;
2860 }
2861 }
2862
2863 /*
2864 * If we use DMA, then it's up to the caller to set the DMA
2865 * mask, but PIO does not need the hw shim so we set a new
2866 * mask here in that case.
2867 */
2868 if (!(host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA))) {
2869 host->dma_mask = DMA_BIT_MASK(64);
2870 mmc_dev(host->mmc)->dma_mask = &host->dma_mask;
2871 }
2872
2873 if (host->version >= SDHCI_SPEC_300)
2874 host->max_clk = (caps[0] & SDHCI_CLOCK_V3_BASE_MASK)
2875 >> SDHCI_CLOCK_BASE_SHIFT;
2876 else
2877 host->max_clk = (caps[0] & SDHCI_CLOCK_BASE_MASK)
2878 >> SDHCI_CLOCK_BASE_SHIFT;
2879
2880 host->max_clk *= 1000000;
2881 if (host->max_clk == 0 || host->quirks &
2882 SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN) {
2883 if (!host->ops->get_max_clock) {
2884 pr_err("%s: Hardware doesn't specify base clock "
2885 "frequency.\n", mmc_hostname(mmc));
2886 return -ENODEV;
2887 }
2888 host->max_clk = host->ops->get_max_clock(host);
2889 }
2890
2891 /*
2892 * In case of Host Controller v3.00, find out whether clock
2893 * multiplier is supported.
2894 */
2895 host->clk_mul = (caps[1] & SDHCI_CLOCK_MUL_MASK) >>
2896 SDHCI_CLOCK_MUL_SHIFT;
2897
2898 /*
2899 * In case the value in Clock Multiplier is 0, then programmable
2900 * clock mode is not supported, otherwise the actual clock
2901 * multiplier is one more than the value of Clock Multiplier
2902 * in the Capabilities Register.
2903 */
2904 if (host->clk_mul)
2905 host->clk_mul += 1;
2906
2907 /*
2908 * Set host parameters.
2909 */
2910 mmc->ops = &sdhci_ops;
2911 mmc->f_max = host->max_clk;
2912 if (host->ops->get_min_clock)
2913 mmc->f_min = host->ops->get_min_clock(host);
2914 else if (host->version >= SDHCI_SPEC_300) {
2915 if (host->clk_mul) {
2916 mmc->f_min = (host->max_clk * host->clk_mul) / 1024;
2917 mmc->f_max = host->max_clk * host->clk_mul;
2918 } else
2919 mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_300;
2920 } else
2921 mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_200;
2922
2923 host->timeout_clk =
2924 (caps[0] & SDHCI_TIMEOUT_CLK_MASK) >> SDHCI_TIMEOUT_CLK_SHIFT;
2925 if (host->timeout_clk == 0) {
2926 if (host->ops->get_timeout_clock) {
2927 host->timeout_clk = host->ops->get_timeout_clock(host);
2928 } else if (!(host->quirks &
2929 SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK)) {
2930 pr_err("%s: Hardware doesn't specify timeout clock "
2931 "frequency.\n", mmc_hostname(mmc));
2932 return -ENODEV;
2933 }
2934 }
2935 if (caps[0] & SDHCI_TIMEOUT_CLK_UNIT)
2936 host->timeout_clk *= 1000;
2937
2938 if (host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK)
2939 host->timeout_clk = mmc->f_max / 1000;
2940
2941 mmc->max_busy_timeout = (1 << 27) / host->timeout_clk;
2942
2943 mmc->caps |= MMC_CAP_SDIO_IRQ | MMC_CAP_ERASE | MMC_CAP_CMD23;
2944
2945 if (host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12)
2946 host->flags |= SDHCI_AUTO_CMD12;
2947
2948 /* Auto-CMD23 stuff only works in ADMA or PIO. */
2949 if ((host->version >= SDHCI_SPEC_300) &&
2950 ((host->flags & SDHCI_USE_ADMA) ||
2951 !(host->flags & SDHCI_USE_SDMA))) {
2952 host->flags |= SDHCI_AUTO_CMD23;
2953 DBG("%s: Auto-CMD23 available\n", mmc_hostname(mmc));
2954 } else {
2955 DBG("%s: Auto-CMD23 unavailable\n", mmc_hostname(mmc));
2956 }
2957
2958 /*
2959 * A controller may support 8-bit width, but the board itself
2960 * might not have the pins brought out. Boards that support
2961 * 8-bit width must set "mmc->caps |= MMC_CAP_8_BIT_DATA;" in
2962 * their platform code before calling sdhci_add_host(), and we
2963 * won't assume 8-bit width for hosts without that CAP.
2964 */
2965 if (!(host->quirks & SDHCI_QUIRK_FORCE_1_BIT_DATA))
2966 mmc->caps |= MMC_CAP_4_BIT_DATA;
2967
2968 if (host->quirks2 & SDHCI_QUIRK2_HOST_NO_CMD23)
2969 mmc->caps &= ~MMC_CAP_CMD23;
2970
2971 if (caps[0] & SDHCI_CAN_DO_HISPD)
2972 mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
2973
2974 if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) &&
2975 !(host->mmc->caps & MMC_CAP_NONREMOVABLE))
2976 mmc->caps |= MMC_CAP_NEEDS_POLL;
2977
2978 /* If vqmmc regulator and no 1.8V signalling, then there's no UHS */
2979 host->vqmmc = regulator_get_optional(mmc_dev(mmc), "vqmmc");
2980 if (IS_ERR_OR_NULL(host->vqmmc)) {
2981 if (PTR_ERR(host->vqmmc) < 0) {
2982 pr_info("%s: no vqmmc regulator found\n",
2983 mmc_hostname(mmc));
2984 host->vqmmc = NULL;
2985 }
2986 } else {
2987 ret = regulator_enable(host->vqmmc);
2988 if (!regulator_is_supported_voltage(host->vqmmc, 1700000,
2989 1950000))
2990 caps[1] &= ~(SDHCI_SUPPORT_SDR104 |
2991 SDHCI_SUPPORT_SDR50 |
2992 SDHCI_SUPPORT_DDR50);
2993 if (ret) {
2994 pr_warn("%s: Failed to enable vqmmc regulator: %d\n",
2995 mmc_hostname(mmc), ret);
2996 host->vqmmc = NULL;
2997 }
2998 }
2999
3000 if (host->quirks2 & SDHCI_QUIRK2_NO_1_8_V)
3001 caps[1] &= ~(SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 |
3002 SDHCI_SUPPORT_DDR50);
3003
3004 /* Any UHS-I mode in caps implies SDR12 and SDR25 support. */
3005 if (caps[1] & (SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 |
3006 SDHCI_SUPPORT_DDR50))
3007 mmc->caps |= MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25;
3008
3009 /* SDR104 supports also implies SDR50 support */
3010 if (caps[1] & SDHCI_SUPPORT_SDR104) {
3011 mmc->caps |= MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_SDR50;
3012 /* SD3.0: SDR104 is supported so (for eMMC) the caps2
3013 * field can be promoted to support HS200.
3014 */
3015 if (!(host->quirks2 & SDHCI_QUIRK2_BROKEN_HS200))
3016 mmc->caps2 |= MMC_CAP2_HS200;
3017 } else if (caps[1] & SDHCI_SUPPORT_SDR50)
3018 mmc->caps |= MMC_CAP_UHS_SDR50;
3019
3020 if ((caps[1] & SDHCI_SUPPORT_DDR50) &&
3021 !(host->quirks2 & SDHCI_QUIRK2_BROKEN_DDR50))
3022 mmc->caps |= MMC_CAP_UHS_DDR50;
3023
3024 /* Does the host need tuning for SDR50? */
3025 if (caps[1] & SDHCI_USE_SDR50_TUNING)
3026 host->flags |= SDHCI_SDR50_NEEDS_TUNING;
3027
3028 /* Does the host need tuning for SDR104 / HS200? */
3029 if (mmc->caps2 & MMC_CAP2_HS200)
3030 host->flags |= SDHCI_SDR104_NEEDS_TUNING;
3031
3032 /* Driver Type(s) (A, C, D) supported by the host */
3033 if (caps[1] & SDHCI_DRIVER_TYPE_A)
3034 mmc->caps |= MMC_CAP_DRIVER_TYPE_A;
3035 if (caps[1] & SDHCI_DRIVER_TYPE_C)
3036 mmc->caps |= MMC_CAP_DRIVER_TYPE_C;
3037 if (caps[1] & SDHCI_DRIVER_TYPE_D)
3038 mmc->caps |= MMC_CAP_DRIVER_TYPE_D;
3039
3040 /* Initial value for re-tuning timer count */
3041 host->tuning_count = (caps[1] & SDHCI_RETUNING_TIMER_COUNT_MASK) >>
3042 SDHCI_RETUNING_TIMER_COUNT_SHIFT;
3043
3044 /*
3045 * In case Re-tuning Timer is not disabled, the actual value of
3046 * re-tuning timer will be 2 ^ (n - 1).
3047 */
3048 if (host->tuning_count)
3049 host->tuning_count = 1 << (host->tuning_count - 1);
3050
3051 /* Re-tuning mode supported by the Host Controller */
3052 host->tuning_mode = (caps[1] & SDHCI_RETUNING_MODE_MASK) >>
3053 SDHCI_RETUNING_MODE_SHIFT;
3054
3055 ocr_avail = 0;
3056
3057 host->vmmc = regulator_get_optional(mmc_dev(mmc), "vmmc");
3058 if (IS_ERR_OR_NULL(host->vmmc)) {
3059 if (PTR_ERR(host->vmmc) < 0) {
3060 pr_info("%s: no vmmc regulator found\n",
3061 mmc_hostname(mmc));
3062 host->vmmc = NULL;
3063 }
3064 }
3065
3066#ifdef CONFIG_REGULATOR
3067 /*
3068 * Voltage range check makes sense only if regulator reports
3069 * any voltage value.
3070 */
3071 if (host->vmmc && regulator_get_voltage(host->vmmc) > 0) {
3072 ret = regulator_is_supported_voltage(host->vmmc, 2700000,
3073 3600000);
3074 if ((ret <= 0) || (!(caps[0] & SDHCI_CAN_VDD_330)))
3075 caps[0] &= ~SDHCI_CAN_VDD_330;
3076 if ((ret <= 0) || (!(caps[0] & SDHCI_CAN_VDD_300)))
3077 caps[0] &= ~SDHCI_CAN_VDD_300;
3078 ret = regulator_is_supported_voltage(host->vmmc, 1700000,
3079 1950000);
3080 if ((ret <= 0) || (!(caps[0] & SDHCI_CAN_VDD_180)))
3081 caps[0] &= ~SDHCI_CAN_VDD_180;
3082 }
3083#endif /* CONFIG_REGULATOR */
3084
3085 /*
3086 * According to SD Host Controller spec v3.00, if the Host System
3087 * can afford more than 150mA, Host Driver should set XPC to 1. Also
3088 * the value is meaningful only if Voltage Support in the Capabilities
3089 * register is set. The actual current value is 4 times the register
3090 * value.
3091 */
3092 max_current_caps = sdhci_readl(host, SDHCI_MAX_CURRENT);
3093 if (!max_current_caps && host->vmmc) {
3094 u32 curr = regulator_get_current_limit(host->vmmc);
3095 if (curr > 0) {
3096
3097 /* convert to SDHCI_MAX_CURRENT format */
3098 curr = curr/1000; /* convert to mA */
3099 curr = curr/SDHCI_MAX_CURRENT_MULTIPLIER;
3100
3101 curr = min_t(u32, curr, SDHCI_MAX_CURRENT_LIMIT);
3102 max_current_caps =
3103 (curr << SDHCI_MAX_CURRENT_330_SHIFT) |
3104 (curr << SDHCI_MAX_CURRENT_300_SHIFT) |
3105 (curr << SDHCI_MAX_CURRENT_180_SHIFT);
3106 }
3107 }
3108
3109 if (caps[0] & SDHCI_CAN_VDD_330) {
3110 ocr_avail |= MMC_VDD_32_33 | MMC_VDD_33_34;
3111
3112 mmc->max_current_330 = ((max_current_caps &
3113 SDHCI_MAX_CURRENT_330_MASK) >>
3114 SDHCI_MAX_CURRENT_330_SHIFT) *
3115 SDHCI_MAX_CURRENT_MULTIPLIER;
3116 }
3117 if (caps[0] & SDHCI_CAN_VDD_300) {
3118 ocr_avail |= MMC_VDD_29_30 | MMC_VDD_30_31;
3119
3120 mmc->max_current_300 = ((max_current_caps &
3121 SDHCI_MAX_CURRENT_300_MASK) >>
3122 SDHCI_MAX_CURRENT_300_SHIFT) *
3123 SDHCI_MAX_CURRENT_MULTIPLIER;
3124 }
3125 if (caps[0] & SDHCI_CAN_VDD_180) {
3126 ocr_avail |= MMC_VDD_165_195;
3127
3128 mmc->max_current_180 = ((max_current_caps &
3129 SDHCI_MAX_CURRENT_180_MASK) >>
3130 SDHCI_MAX_CURRENT_180_SHIFT) *
3131 SDHCI_MAX_CURRENT_MULTIPLIER;
3132 }
3133
3134 if (host->ocr_mask)
3135 ocr_avail = host->ocr_mask;
3136
3137 mmc->ocr_avail = ocr_avail;
3138 mmc->ocr_avail_sdio = ocr_avail;
3139 if (host->ocr_avail_sdio)
3140 mmc->ocr_avail_sdio &= host->ocr_avail_sdio;
3141 mmc->ocr_avail_sd = ocr_avail;
3142 if (host->ocr_avail_sd)
3143 mmc->ocr_avail_sd &= host->ocr_avail_sd;
3144 else /* normal SD controllers don't support 1.8V */
3145 mmc->ocr_avail_sd &= ~MMC_VDD_165_195;
3146 mmc->ocr_avail_mmc = ocr_avail;
3147 if (host->ocr_avail_mmc)
3148 mmc->ocr_avail_mmc &= host->ocr_avail_mmc;
3149
3150 if (mmc->ocr_avail == 0) {
3151 pr_err("%s: Hardware doesn't report any "
3152 "support voltages.\n", mmc_hostname(mmc));
3153 return -ENODEV;
3154 }
3155
3156 spin_lock_init(&host->lock);
3157
3158 /*
3159 * Maximum number of segments. Depends on if the hardware
3160 * can do scatter/gather or not.
3161 */
3162 if (host->flags & SDHCI_USE_ADMA)
3163 mmc->max_segs = 128;
3164 else if (host->flags & SDHCI_USE_SDMA)
3165 mmc->max_segs = 1;
3166 else /* PIO */
3167 mmc->max_segs = 128;
3168
3169 /*
3170 * Maximum number of sectors in one transfer. Limited by DMA boundary
3171 * size (512KiB).
3172 */
3173 mmc->max_req_size = 524288;
3174
3175 /*
3176 * Maximum segment size. Could be one segment with the maximum number
3177 * of bytes. When doing hardware scatter/gather, each entry cannot
3178 * be larger than 64 KiB though.
3179 */
3180 if (host->flags & SDHCI_USE_ADMA) {
3181 if (host->quirks & SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC)
3182 mmc->max_seg_size = 65535;
3183 else
3184 mmc->max_seg_size = 65536;
3185 } else {
3186 mmc->max_seg_size = mmc->max_req_size;
3187 }
3188
3189 /*
3190 * Maximum block size. This varies from controller to controller and
3191 * is specified in the capabilities register.
3192 */
3193 if (host->quirks & SDHCI_QUIRK_FORCE_BLK_SZ_2048) {
3194 mmc->max_blk_size = 2;
3195 } else {
3196 mmc->max_blk_size = (caps[0] & SDHCI_MAX_BLOCK_MASK) >>
3197 SDHCI_MAX_BLOCK_SHIFT;
3198 if (mmc->max_blk_size >= 3) {
3199 pr_warning("%s: Invalid maximum block size, "
3200 "assuming 512 bytes\n", mmc_hostname(mmc));
3201 mmc->max_blk_size = 0;
3202 }
3203 }
3204
3205 mmc->max_blk_size = 512 << mmc->max_blk_size;
3206
3207 /*
3208 * Maximum block count.
3209 */
3210 mmc->max_blk_count = (host->quirks & SDHCI_QUIRK_NO_MULTIBLOCK) ? 1 : 65535;
3211
3212 /*
3213 * Init tasklets.
3214 */
3215 tasklet_init(&host->card_tasklet,
3216 sdhci_tasklet_card, (unsigned long)host);
3217 tasklet_init(&host->finish_tasklet,
3218 sdhci_tasklet_finish, (unsigned long)host);
3219
3220 setup_timer(&host->timer, sdhci_timeout_timer, (unsigned long)host);
3221
3222 if (host->version >= SDHCI_SPEC_300) {
3223 init_waitqueue_head(&host->buf_ready_int);
3224
3225 /* Initialize re-tuning timer */
3226 init_timer(&host->tuning_timer);
3227 host->tuning_timer.data = (unsigned long)host;
3228 host->tuning_timer.function = sdhci_tuning_timer;
3229 }
3230
3231 sdhci_init(host, 0);
3232
3233 ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED,
3234 mmc_hostname(mmc), host);
3235 if (ret) {
3236 pr_err("%s: Failed to request IRQ %d: %d\n",
3237 mmc_hostname(mmc), host->irq, ret);
3238 goto untasklet;
3239 }
3240
3241#ifdef CONFIG_MMC_DEBUG
3242 sdhci_dumpregs(host);
3243#endif
3244
3245#ifdef SDHCI_USE_LEDS_CLASS
3246 snprintf(host->led_name, sizeof(host->led_name),
3247 "%s::", mmc_hostname(mmc));
3248 host->led.name = host->led_name;
3249 host->led.brightness = LED_OFF;
3250 host->led.default_trigger = mmc_hostname(mmc);
3251 host->led.brightness_set = sdhci_led_control;
3252
3253 ret = led_classdev_register(mmc_dev(mmc), &host->led);
3254 if (ret) {
3255 pr_err("%s: Failed to register LED device: %d\n",
3256 mmc_hostname(mmc), ret);
3257 goto reset;
3258 }
3259#endif
3260
3261 mmiowb();
3262
3263 mmc_add_host(mmc);
3264
3265 pr_info("%s: SDHCI controller on %s [%s] using %s\n",
3266 mmc_hostname(mmc), host->hw_name, dev_name(mmc_dev(mmc)),
3267 (host->flags & SDHCI_USE_ADMA) ? "ADMA" :
3268 (host->flags & SDHCI_USE_SDMA) ? "DMA" : "PIO");
3269
3270 sdhci_enable_card_detection(host);
3271
3272 return 0;
3273
3274#ifdef SDHCI_USE_LEDS_CLASS
3275reset:
3276 sdhci_reset(host, SDHCI_RESET_ALL);
3277 sdhci_mask_irqs(host, SDHCI_INT_ALL_MASK);
3278 free_irq(host->irq, host);
3279#endif
3280untasklet:
3281 tasklet_kill(&host->card_tasklet);
3282 tasklet_kill(&host->finish_tasklet);
3283
3284 return ret;
3285}
3286
3287EXPORT_SYMBOL_GPL(sdhci_add_host);
3288
3289void sdhci_remove_host(struct sdhci_host *host, int dead)
3290{
3291 unsigned long flags;
3292
3293 if (dead) {
3294 spin_lock_irqsave(&host->lock, flags);
3295
3296 host->flags |= SDHCI_DEVICE_DEAD;
3297
3298 if (host->mrq) {
3299 pr_err("%s: Controller removed during "
3300 " transfer!\n", mmc_hostname(host->mmc));
3301
3302 host->mrq->cmd->error = -ENOMEDIUM;
3303 tasklet_schedule(&host->finish_tasklet);
3304 }
3305
3306 spin_unlock_irqrestore(&host->lock, flags);
3307 }
3308
3309 sdhci_disable_card_detection(host);
3310
3311 mmc_remove_host(host->mmc);
3312
3313#ifdef SDHCI_USE_LEDS_CLASS
3314 led_classdev_unregister(&host->led);
3315#endif
3316
3317 if (!dead)
3318 sdhci_reset(host, SDHCI_RESET_ALL);
3319
3320 sdhci_mask_irqs(host, SDHCI_INT_ALL_MASK);
3321 free_irq(host->irq, host);
3322
3323 del_timer_sync(&host->timer);
3324
3325 tasklet_kill(&host->card_tasklet);
3326 tasklet_kill(&host->finish_tasklet);
3327
3328 if (host->vmmc) {
3329 regulator_disable(host->vmmc);
3330 regulator_put(host->vmmc);
3331 }
3332
3333 if (host->vqmmc) {
3334 regulator_disable(host->vqmmc);
3335 regulator_put(host->vqmmc);
3336 }
3337
3338 kfree(host->adma_desc);
3339 kfree(host->align_buffer);
3340
3341 host->adma_desc = NULL;
3342 host->align_buffer = NULL;
3343}
3344
3345EXPORT_SYMBOL_GPL(sdhci_remove_host);
3346
3347void sdhci_free_host(struct sdhci_host *host)
3348{
3349 mmc_free_host(host->mmc);
3350}
3351
3352EXPORT_SYMBOL_GPL(sdhci_free_host);
3353
3354/*****************************************************************************\
3355 * *
3356 * Driver init/exit *
3357 * *
3358\*****************************************************************************/
3359
3360static int __init sdhci_drv_init(void)
3361{
3362 pr_info(DRIVER_NAME
3363 ": Secure Digital Host Controller Interface driver\n");
3364 pr_info(DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
3365
3366 return 0;
3367}
3368
3369static void __exit sdhci_drv_exit(void)
3370{
3371}
3372
3373module_init(sdhci_drv_init);
3374module_exit(sdhci_drv_exit);
3375
3376module_param(debug_quirks, uint, 0444);
3377module_param(debug_quirks2, uint, 0444);
3378
3379MODULE_AUTHOR("Pierre Ossman <pierre@ossman.eu>");
3380MODULE_DESCRIPTION("Secure Digital Host Controller Interface core driver");
3381MODULE_LICENSE("GPL");
3382
3383MODULE_PARM_DESC(debug_quirks, "Force certain quirks.");
3384MODULE_PARM_DESC(debug_quirks2, "Force certain other quirks.");
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/swiotlb.h>
24#include <linux/regulator/consumer.h>
25#include <linux/pm_runtime.h>
26#include <linux/of.h>
27
28#include <linux/leds.h>
29
30#include <linux/mmc/mmc.h>
31#include <linux/mmc/host.h>
32#include <linux/mmc/card.h>
33#include <linux/mmc/sdio.h>
34#include <linux/mmc/slot-gpio.h>
35
36#include "sdhci.h"
37
38#define DRIVER_NAME "sdhci"
39
40#define DBG(f, x...) \
41 pr_debug("%s: " DRIVER_NAME ": " f, mmc_hostname(host->mmc), ## x)
42
43#define SDHCI_DUMP(f, x...) \
44 pr_err("%s: " DRIVER_NAME ": " f, mmc_hostname(host->mmc), ## x)
45
46#define MAX_TUNING_LOOP 40
47
48static unsigned int debug_quirks = 0;
49static unsigned int debug_quirks2;
50
51static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable);
52
53static bool sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd);
54
55void sdhci_dumpregs(struct sdhci_host *host)
56{
57 SDHCI_DUMP("============ SDHCI REGISTER DUMP ===========\n");
58
59 SDHCI_DUMP("Sys addr: 0x%08x | Version: 0x%08x\n",
60 sdhci_readl(host, SDHCI_DMA_ADDRESS),
61 sdhci_readw(host, SDHCI_HOST_VERSION));
62 SDHCI_DUMP("Blk size: 0x%08x | Blk cnt: 0x%08x\n",
63 sdhci_readw(host, SDHCI_BLOCK_SIZE),
64 sdhci_readw(host, SDHCI_BLOCK_COUNT));
65 SDHCI_DUMP("Argument: 0x%08x | Trn mode: 0x%08x\n",
66 sdhci_readl(host, SDHCI_ARGUMENT),
67 sdhci_readw(host, SDHCI_TRANSFER_MODE));
68 SDHCI_DUMP("Present: 0x%08x | Host ctl: 0x%08x\n",
69 sdhci_readl(host, SDHCI_PRESENT_STATE),
70 sdhci_readb(host, SDHCI_HOST_CONTROL));
71 SDHCI_DUMP("Power: 0x%08x | Blk gap: 0x%08x\n",
72 sdhci_readb(host, SDHCI_POWER_CONTROL),
73 sdhci_readb(host, SDHCI_BLOCK_GAP_CONTROL));
74 SDHCI_DUMP("Wake-up: 0x%08x | Clock: 0x%08x\n",
75 sdhci_readb(host, SDHCI_WAKE_UP_CONTROL),
76 sdhci_readw(host, SDHCI_CLOCK_CONTROL));
77 SDHCI_DUMP("Timeout: 0x%08x | Int stat: 0x%08x\n",
78 sdhci_readb(host, SDHCI_TIMEOUT_CONTROL),
79 sdhci_readl(host, SDHCI_INT_STATUS));
80 SDHCI_DUMP("Int enab: 0x%08x | Sig enab: 0x%08x\n",
81 sdhci_readl(host, SDHCI_INT_ENABLE),
82 sdhci_readl(host, SDHCI_SIGNAL_ENABLE));
83 SDHCI_DUMP("ACmd stat: 0x%08x | Slot int: 0x%08x\n",
84 sdhci_readw(host, SDHCI_AUTO_CMD_STATUS),
85 sdhci_readw(host, SDHCI_SLOT_INT_STATUS));
86 SDHCI_DUMP("Caps: 0x%08x | Caps_1: 0x%08x\n",
87 sdhci_readl(host, SDHCI_CAPABILITIES),
88 sdhci_readl(host, SDHCI_CAPABILITIES_1));
89 SDHCI_DUMP("Cmd: 0x%08x | Max curr: 0x%08x\n",
90 sdhci_readw(host, SDHCI_COMMAND),
91 sdhci_readl(host, SDHCI_MAX_CURRENT));
92 SDHCI_DUMP("Resp[0]: 0x%08x | Resp[1]: 0x%08x\n",
93 sdhci_readl(host, SDHCI_RESPONSE),
94 sdhci_readl(host, SDHCI_RESPONSE + 4));
95 SDHCI_DUMP("Resp[2]: 0x%08x | Resp[3]: 0x%08x\n",
96 sdhci_readl(host, SDHCI_RESPONSE + 8),
97 sdhci_readl(host, SDHCI_RESPONSE + 12));
98 SDHCI_DUMP("Host ctl2: 0x%08x\n",
99 sdhci_readw(host, SDHCI_HOST_CONTROL2));
100
101 if (host->flags & SDHCI_USE_ADMA) {
102 if (host->flags & SDHCI_USE_64_BIT_DMA) {
103 SDHCI_DUMP("ADMA Err: 0x%08x | ADMA Ptr: 0x%08x%08x\n",
104 sdhci_readl(host, SDHCI_ADMA_ERROR),
105 sdhci_readl(host, SDHCI_ADMA_ADDRESS_HI),
106 sdhci_readl(host, SDHCI_ADMA_ADDRESS));
107 } else {
108 SDHCI_DUMP("ADMA Err: 0x%08x | ADMA Ptr: 0x%08x\n",
109 sdhci_readl(host, SDHCI_ADMA_ERROR),
110 sdhci_readl(host, SDHCI_ADMA_ADDRESS));
111 }
112 }
113
114 if (host->ops->dump_vendor_regs)
115 host->ops->dump_vendor_regs(host);
116
117 SDHCI_DUMP("============================================\n");
118}
119EXPORT_SYMBOL_GPL(sdhci_dumpregs);
120
121/*****************************************************************************\
122 * *
123 * Low level functions *
124 * *
125\*****************************************************************************/
126
127static void sdhci_do_enable_v4_mode(struct sdhci_host *host)
128{
129 u16 ctrl2;
130
131 ctrl2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
132 if (ctrl2 & SDHCI_CTRL_V4_MODE)
133 return;
134
135 ctrl2 |= SDHCI_CTRL_V4_MODE;
136 sdhci_writew(host, ctrl2, SDHCI_HOST_CONTROL2);
137}
138
139/*
140 * This can be called before sdhci_add_host() by Vendor's host controller
141 * driver to enable v4 mode if supported.
142 */
143void sdhci_enable_v4_mode(struct sdhci_host *host)
144{
145 host->v4_mode = true;
146 sdhci_do_enable_v4_mode(host);
147}
148EXPORT_SYMBOL_GPL(sdhci_enable_v4_mode);
149
150static inline bool sdhci_data_line_cmd(struct mmc_command *cmd)
151{
152 return cmd->data || cmd->flags & MMC_RSP_BUSY;
153}
154
155static void sdhci_set_card_detection(struct sdhci_host *host, bool enable)
156{
157 u32 present;
158
159 if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) ||
160 !mmc_card_is_removable(host->mmc) || mmc_can_gpio_cd(host->mmc))
161 return;
162
163 if (enable) {
164 present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
165 SDHCI_CARD_PRESENT;
166
167 host->ier |= present ? SDHCI_INT_CARD_REMOVE :
168 SDHCI_INT_CARD_INSERT;
169 } else {
170 host->ier &= ~(SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT);
171 }
172
173 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
174 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
175}
176
177static void sdhci_enable_card_detection(struct sdhci_host *host)
178{
179 sdhci_set_card_detection(host, true);
180}
181
182static void sdhci_disable_card_detection(struct sdhci_host *host)
183{
184 sdhci_set_card_detection(host, false);
185}
186
187static void sdhci_runtime_pm_bus_on(struct sdhci_host *host)
188{
189 if (host->bus_on)
190 return;
191 host->bus_on = true;
192 pm_runtime_get_noresume(host->mmc->parent);
193}
194
195static void sdhci_runtime_pm_bus_off(struct sdhci_host *host)
196{
197 if (!host->bus_on)
198 return;
199 host->bus_on = false;
200 pm_runtime_put_noidle(host->mmc->parent);
201}
202
203void sdhci_reset(struct sdhci_host *host, u8 mask)
204{
205 ktime_t timeout;
206
207 sdhci_writeb(host, mask, SDHCI_SOFTWARE_RESET);
208
209 if (mask & SDHCI_RESET_ALL) {
210 host->clock = 0;
211 /* Reset-all turns off SD Bus Power */
212 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
213 sdhci_runtime_pm_bus_off(host);
214 }
215
216 /* Wait max 100 ms */
217 timeout = ktime_add_ms(ktime_get(), 100);
218
219 /* hw clears the bit when it's done */
220 while (1) {
221 bool timedout = ktime_after(ktime_get(), timeout);
222
223 if (!(sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask))
224 break;
225 if (timedout) {
226 pr_err("%s: Reset 0x%x never completed.\n",
227 mmc_hostname(host->mmc), (int)mask);
228 sdhci_dumpregs(host);
229 return;
230 }
231 udelay(10);
232 }
233}
234EXPORT_SYMBOL_GPL(sdhci_reset);
235
236static void 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;
243 }
244
245 host->ops->reset(host, mask);
246
247 if (mask & SDHCI_RESET_ALL) {
248 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
249 if (host->ops->enable_dma)
250 host->ops->enable_dma(host);
251 }
252
253 /* Resetting the controller clears many */
254 host->preset_enabled = false;
255 }
256}
257
258static void sdhci_set_default_irqs(struct sdhci_host *host)
259{
260 host->ier = SDHCI_INT_BUS_POWER | SDHCI_INT_DATA_END_BIT |
261 SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_TIMEOUT |
262 SDHCI_INT_INDEX | SDHCI_INT_END_BIT | SDHCI_INT_CRC |
263 SDHCI_INT_TIMEOUT | SDHCI_INT_DATA_END |
264 SDHCI_INT_RESPONSE;
265
266 if (host->tuning_mode == SDHCI_TUNING_MODE_2 ||
267 host->tuning_mode == SDHCI_TUNING_MODE_3)
268 host->ier |= SDHCI_INT_RETUNE;
269
270 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
271 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
272}
273
274static void sdhci_config_dma(struct sdhci_host *host)
275{
276 u8 ctrl;
277 u16 ctrl2;
278
279 if (host->version < SDHCI_SPEC_200)
280 return;
281
282 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
283
284 /*
285 * Always adjust the DMA selection as some controllers
286 * (e.g. JMicron) can't do PIO properly when the selection
287 * is ADMA.
288 */
289 ctrl &= ~SDHCI_CTRL_DMA_MASK;
290 if (!(host->flags & SDHCI_REQ_USE_DMA))
291 goto out;
292
293 /* Note if DMA Select is zero then SDMA is selected */
294 if (host->flags & SDHCI_USE_ADMA)
295 ctrl |= SDHCI_CTRL_ADMA32;
296
297 if (host->flags & SDHCI_USE_64_BIT_DMA) {
298 /*
299 * If v4 mode, all supported DMA can be 64-bit addressing if
300 * controller supports 64-bit system address, otherwise only
301 * ADMA can support 64-bit addressing.
302 */
303 if (host->v4_mode) {
304 ctrl2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
305 ctrl2 |= SDHCI_CTRL_64BIT_ADDR;
306 sdhci_writew(host, ctrl2, SDHCI_HOST_CONTROL2);
307 } else if (host->flags & SDHCI_USE_ADMA) {
308 /*
309 * Don't need to undo SDHCI_CTRL_ADMA32 in order to
310 * set SDHCI_CTRL_ADMA64.
311 */
312 ctrl |= SDHCI_CTRL_ADMA64;
313 }
314 }
315
316out:
317 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
318}
319
320static void sdhci_init(struct sdhci_host *host, int soft)
321{
322 struct mmc_host *mmc = host->mmc;
323 unsigned long flags;
324
325 if (soft)
326 sdhci_do_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
327 else
328 sdhci_do_reset(host, SDHCI_RESET_ALL);
329
330 if (host->v4_mode)
331 sdhci_do_enable_v4_mode(host);
332
333 spin_lock_irqsave(&host->lock, flags);
334 sdhci_set_default_irqs(host);
335 spin_unlock_irqrestore(&host->lock, flags);
336
337 host->cqe_on = false;
338
339 if (soft) {
340 /* force clock reconfiguration */
341 host->clock = 0;
342 mmc->ops->set_ios(mmc, &mmc->ios);
343 }
344}
345
346static void sdhci_reinit(struct sdhci_host *host)
347{
348 u32 cd = host->ier & (SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT);
349
350 sdhci_init(host, 0);
351 sdhci_enable_card_detection(host);
352
353 /*
354 * A change to the card detect bits indicates a change in present state,
355 * refer sdhci_set_card_detection(). A card detect interrupt might have
356 * been missed while the host controller was being reset, so trigger a
357 * rescan to check.
358 */
359 if (cd != (host->ier & (SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT)))
360 mmc_detect_change(host->mmc, msecs_to_jiffies(200));
361}
362
363static void __sdhci_led_activate(struct sdhci_host *host)
364{
365 u8 ctrl;
366
367 if (host->quirks & SDHCI_QUIRK_NO_LED)
368 return;
369
370 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
371 ctrl |= SDHCI_CTRL_LED;
372 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
373}
374
375static void __sdhci_led_deactivate(struct sdhci_host *host)
376{
377 u8 ctrl;
378
379 if (host->quirks & SDHCI_QUIRK_NO_LED)
380 return;
381
382 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
383 ctrl &= ~SDHCI_CTRL_LED;
384 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
385}
386
387#if IS_REACHABLE(CONFIG_LEDS_CLASS)
388static void sdhci_led_control(struct led_classdev *led,
389 enum led_brightness brightness)
390{
391 struct sdhci_host *host = container_of(led, struct sdhci_host, led);
392 unsigned long flags;
393
394 spin_lock_irqsave(&host->lock, flags);
395
396 if (host->runtime_suspended)
397 goto out;
398
399 if (brightness == LED_OFF)
400 __sdhci_led_deactivate(host);
401 else
402 __sdhci_led_activate(host);
403out:
404 spin_unlock_irqrestore(&host->lock, flags);
405}
406
407static int sdhci_led_register(struct sdhci_host *host)
408{
409 struct mmc_host *mmc = host->mmc;
410
411 if (host->quirks & SDHCI_QUIRK_NO_LED)
412 return 0;
413
414 snprintf(host->led_name, sizeof(host->led_name),
415 "%s::", mmc_hostname(mmc));
416
417 host->led.name = host->led_name;
418 host->led.brightness = LED_OFF;
419 host->led.default_trigger = mmc_hostname(mmc);
420 host->led.brightness_set = sdhci_led_control;
421
422 return led_classdev_register(mmc_dev(mmc), &host->led);
423}
424
425static void sdhci_led_unregister(struct sdhci_host *host)
426{
427 if (host->quirks & SDHCI_QUIRK_NO_LED)
428 return;
429
430 led_classdev_unregister(&host->led);
431}
432
433static inline void sdhci_led_activate(struct sdhci_host *host)
434{
435}
436
437static inline void sdhci_led_deactivate(struct sdhci_host *host)
438{
439}
440
441#else
442
443static inline int sdhci_led_register(struct sdhci_host *host)
444{
445 return 0;
446}
447
448static inline void sdhci_led_unregister(struct sdhci_host *host)
449{
450}
451
452static inline void sdhci_led_activate(struct sdhci_host *host)
453{
454 __sdhci_led_activate(host);
455}
456
457static inline void sdhci_led_deactivate(struct sdhci_host *host)
458{
459 __sdhci_led_deactivate(host);
460}
461
462#endif
463
464static void sdhci_mod_timer(struct sdhci_host *host, struct mmc_request *mrq,
465 unsigned long timeout)
466{
467 if (sdhci_data_line_cmd(mrq->cmd))
468 mod_timer(&host->data_timer, timeout);
469 else
470 mod_timer(&host->timer, timeout);
471}
472
473static void sdhci_del_timer(struct sdhci_host *host, struct mmc_request *mrq)
474{
475 if (sdhci_data_line_cmd(mrq->cmd))
476 del_timer(&host->data_timer);
477 else
478 del_timer(&host->timer);
479}
480
481static inline bool sdhci_has_requests(struct sdhci_host *host)
482{
483 return host->cmd || host->data_cmd;
484}
485
486/*****************************************************************************\
487 * *
488 * Core functions *
489 * *
490\*****************************************************************************/
491
492static void sdhci_read_block_pio(struct sdhci_host *host)
493{
494 unsigned long flags;
495 size_t blksize, len, chunk;
496 u32 scratch;
497 u8 *buf;
498
499 DBG("PIO reading\n");
500
501 blksize = host->data->blksz;
502 chunk = 0;
503
504 local_irq_save(flags);
505
506 while (blksize) {
507 BUG_ON(!sg_miter_next(&host->sg_miter));
508
509 len = min(host->sg_miter.length, blksize);
510
511 blksize -= len;
512 host->sg_miter.consumed = len;
513
514 buf = host->sg_miter.addr;
515
516 while (len) {
517 if (chunk == 0) {
518 scratch = sdhci_readl(host, SDHCI_BUFFER);
519 chunk = 4;
520 }
521
522 *buf = scratch & 0xFF;
523
524 buf++;
525 scratch >>= 8;
526 chunk--;
527 len--;
528 }
529 }
530
531 sg_miter_stop(&host->sg_miter);
532
533 local_irq_restore(flags);
534}
535
536static void sdhci_write_block_pio(struct sdhci_host *host)
537{
538 unsigned long flags;
539 size_t blksize, len, chunk;
540 u32 scratch;
541 u8 *buf;
542
543 DBG("PIO writing\n");
544
545 blksize = host->data->blksz;
546 chunk = 0;
547 scratch = 0;
548
549 local_irq_save(flags);
550
551 while (blksize) {
552 BUG_ON(!sg_miter_next(&host->sg_miter));
553
554 len = min(host->sg_miter.length, blksize);
555
556 blksize -= len;
557 host->sg_miter.consumed = len;
558
559 buf = host->sg_miter.addr;
560
561 while (len) {
562 scratch |= (u32)*buf << (chunk * 8);
563
564 buf++;
565 chunk++;
566 len--;
567
568 if ((chunk == 4) || ((len == 0) && (blksize == 0))) {
569 sdhci_writel(host, scratch, SDHCI_BUFFER);
570 chunk = 0;
571 scratch = 0;
572 }
573 }
574 }
575
576 sg_miter_stop(&host->sg_miter);
577
578 local_irq_restore(flags);
579}
580
581static void sdhci_transfer_pio(struct sdhci_host *host)
582{
583 u32 mask;
584
585 if (host->blocks == 0)
586 return;
587
588 if (host->data->flags & MMC_DATA_READ)
589 mask = SDHCI_DATA_AVAILABLE;
590 else
591 mask = SDHCI_SPACE_AVAILABLE;
592
593 /*
594 * Some controllers (JMicron JMB38x) mess up the buffer bits
595 * for transfers < 4 bytes. As long as it is just one block,
596 * we can ignore the bits.
597 */
598 if ((host->quirks & SDHCI_QUIRK_BROKEN_SMALL_PIO) &&
599 (host->data->blocks == 1))
600 mask = ~0;
601
602 while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) {
603 if (host->quirks & SDHCI_QUIRK_PIO_NEEDS_DELAY)
604 udelay(100);
605
606 if (host->data->flags & MMC_DATA_READ)
607 sdhci_read_block_pio(host);
608 else
609 sdhci_write_block_pio(host);
610
611 host->blocks--;
612 if (host->blocks == 0)
613 break;
614 }
615
616 DBG("PIO transfer complete.\n");
617}
618
619static int sdhci_pre_dma_transfer(struct sdhci_host *host,
620 struct mmc_data *data, int cookie)
621{
622 int sg_count;
623
624 /*
625 * If the data buffers are already mapped, return the previous
626 * dma_map_sg() result.
627 */
628 if (data->host_cookie == COOKIE_PRE_MAPPED)
629 return data->sg_count;
630
631 /* Bounce write requests to the bounce buffer */
632 if (host->bounce_buffer) {
633 unsigned int length = data->blksz * data->blocks;
634
635 if (length > host->bounce_buffer_size) {
636 pr_err("%s: asked for transfer of %u bytes exceeds bounce buffer %u bytes\n",
637 mmc_hostname(host->mmc), length,
638 host->bounce_buffer_size);
639 return -EIO;
640 }
641 if (mmc_get_dma_dir(data) == DMA_TO_DEVICE) {
642 /* Copy the data to the bounce buffer */
643 if (host->ops->copy_to_bounce_buffer) {
644 host->ops->copy_to_bounce_buffer(host,
645 data, length);
646 } else {
647 sg_copy_to_buffer(data->sg, data->sg_len,
648 host->bounce_buffer, length);
649 }
650 }
651 /* Switch ownership to the DMA */
652 dma_sync_single_for_device(host->mmc->parent,
653 host->bounce_addr,
654 host->bounce_buffer_size,
655 mmc_get_dma_dir(data));
656 /* Just a dummy value */
657 sg_count = 1;
658 } else {
659 /* Just access the data directly from memory */
660 sg_count = dma_map_sg(mmc_dev(host->mmc),
661 data->sg, data->sg_len,
662 mmc_get_dma_dir(data));
663 }
664
665 if (sg_count == 0)
666 return -ENOSPC;
667
668 data->sg_count = sg_count;
669 data->host_cookie = cookie;
670
671 return sg_count;
672}
673
674static char *sdhci_kmap_atomic(struct scatterlist *sg, unsigned long *flags)
675{
676 local_irq_save(*flags);
677 return kmap_atomic(sg_page(sg)) + sg->offset;
678}
679
680static void sdhci_kunmap_atomic(void *buffer, unsigned long *flags)
681{
682 kunmap_atomic(buffer);
683 local_irq_restore(*flags);
684}
685
686void sdhci_adma_write_desc(struct sdhci_host *host, void **desc,
687 dma_addr_t addr, int len, unsigned int cmd)
688{
689 struct sdhci_adma2_64_desc *dma_desc = *desc;
690
691 /* 32-bit and 64-bit descriptors have these members in same position */
692 dma_desc->cmd = cpu_to_le16(cmd);
693 dma_desc->len = cpu_to_le16(len);
694 dma_desc->addr_lo = cpu_to_le32(lower_32_bits(addr));
695
696 if (host->flags & SDHCI_USE_64_BIT_DMA)
697 dma_desc->addr_hi = cpu_to_le32(upper_32_bits(addr));
698
699 *desc += host->desc_sz;
700}
701EXPORT_SYMBOL_GPL(sdhci_adma_write_desc);
702
703static inline void __sdhci_adma_write_desc(struct sdhci_host *host,
704 void **desc, dma_addr_t addr,
705 int len, unsigned int cmd)
706{
707 if (host->ops->adma_write_desc)
708 host->ops->adma_write_desc(host, desc, addr, len, cmd);
709 else
710 sdhci_adma_write_desc(host, desc, addr, len, cmd);
711}
712
713static void sdhci_adma_mark_end(void *desc)
714{
715 struct sdhci_adma2_64_desc *dma_desc = desc;
716
717 /* 32-bit and 64-bit descriptors have 'cmd' in same position */
718 dma_desc->cmd |= cpu_to_le16(ADMA2_END);
719}
720
721static void sdhci_adma_table_pre(struct sdhci_host *host,
722 struct mmc_data *data, int sg_count)
723{
724 struct scatterlist *sg;
725 unsigned long flags;
726 dma_addr_t addr, align_addr;
727 void *desc, *align;
728 char *buffer;
729 int len, offset, i;
730
731 /*
732 * The spec does not specify endianness of descriptor table.
733 * We currently guess that it is LE.
734 */
735
736 host->sg_count = sg_count;
737
738 desc = host->adma_table;
739 align = host->align_buffer;
740
741 align_addr = host->align_addr;
742
743 for_each_sg(data->sg, sg, host->sg_count, i) {
744 addr = sg_dma_address(sg);
745 len = sg_dma_len(sg);
746
747 /*
748 * The SDHCI specification states that ADMA addresses must
749 * be 32-bit aligned. If they aren't, then we use a bounce
750 * buffer for the (up to three) bytes that screw up the
751 * alignment.
752 */
753 offset = (SDHCI_ADMA2_ALIGN - (addr & SDHCI_ADMA2_MASK)) &
754 SDHCI_ADMA2_MASK;
755 if (offset) {
756 if (data->flags & MMC_DATA_WRITE) {
757 buffer = sdhci_kmap_atomic(sg, &flags);
758 memcpy(align, buffer, offset);
759 sdhci_kunmap_atomic(buffer, &flags);
760 }
761
762 /* tran, valid */
763 __sdhci_adma_write_desc(host, &desc, align_addr,
764 offset, ADMA2_TRAN_VALID);
765
766 BUG_ON(offset > 65536);
767
768 align += SDHCI_ADMA2_ALIGN;
769 align_addr += SDHCI_ADMA2_ALIGN;
770
771 addr += offset;
772 len -= offset;
773 }
774
775 BUG_ON(len > 65536);
776
777 /* tran, valid */
778 if (len)
779 __sdhci_adma_write_desc(host, &desc, addr, len,
780 ADMA2_TRAN_VALID);
781
782 /*
783 * If this triggers then we have a calculation bug
784 * somewhere. :/
785 */
786 WARN_ON((desc - host->adma_table) >= host->adma_table_sz);
787 }
788
789 if (host->quirks & SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC) {
790 /* Mark the last descriptor as the terminating descriptor */
791 if (desc != host->adma_table) {
792 desc -= host->desc_sz;
793 sdhci_adma_mark_end(desc);
794 }
795 } else {
796 /* Add a terminating entry - nop, end, valid */
797 __sdhci_adma_write_desc(host, &desc, 0, 0, ADMA2_NOP_END_VALID);
798 }
799}
800
801static void sdhci_adma_table_post(struct sdhci_host *host,
802 struct mmc_data *data)
803{
804 struct scatterlist *sg;
805 int i, size;
806 void *align;
807 char *buffer;
808 unsigned long flags;
809
810 if (data->flags & MMC_DATA_READ) {
811 bool has_unaligned = false;
812
813 /* Do a quick scan of the SG list for any unaligned mappings */
814 for_each_sg(data->sg, sg, host->sg_count, i)
815 if (sg_dma_address(sg) & SDHCI_ADMA2_MASK) {
816 has_unaligned = true;
817 break;
818 }
819
820 if (has_unaligned) {
821 dma_sync_sg_for_cpu(mmc_dev(host->mmc), data->sg,
822 data->sg_len, DMA_FROM_DEVICE);
823
824 align = host->align_buffer;
825
826 for_each_sg(data->sg, sg, host->sg_count, i) {
827 if (sg_dma_address(sg) & SDHCI_ADMA2_MASK) {
828 size = SDHCI_ADMA2_ALIGN -
829 (sg_dma_address(sg) & SDHCI_ADMA2_MASK);
830
831 buffer = sdhci_kmap_atomic(sg, &flags);
832 memcpy(buffer, align, size);
833 sdhci_kunmap_atomic(buffer, &flags);
834
835 align += SDHCI_ADMA2_ALIGN;
836 }
837 }
838 }
839 }
840}
841
842static void sdhci_set_adma_addr(struct sdhci_host *host, dma_addr_t addr)
843{
844 sdhci_writel(host, lower_32_bits(addr), SDHCI_ADMA_ADDRESS);
845 if (host->flags & SDHCI_USE_64_BIT_DMA)
846 sdhci_writel(host, upper_32_bits(addr), SDHCI_ADMA_ADDRESS_HI);
847}
848
849static dma_addr_t sdhci_sdma_address(struct sdhci_host *host)
850{
851 if (host->bounce_buffer)
852 return host->bounce_addr;
853 else
854 return sg_dma_address(host->data->sg);
855}
856
857static void sdhci_set_sdma_addr(struct sdhci_host *host, dma_addr_t addr)
858{
859 if (host->v4_mode)
860 sdhci_set_adma_addr(host, addr);
861 else
862 sdhci_writel(host, addr, SDHCI_DMA_ADDRESS);
863}
864
865static unsigned int sdhci_target_timeout(struct sdhci_host *host,
866 struct mmc_command *cmd,
867 struct mmc_data *data)
868{
869 unsigned int target_timeout;
870
871 /* timeout in us */
872 if (!data) {
873 target_timeout = cmd->busy_timeout * 1000;
874 } else {
875 target_timeout = DIV_ROUND_UP(data->timeout_ns, 1000);
876 if (host->clock && data->timeout_clks) {
877 unsigned long long val;
878
879 /*
880 * data->timeout_clks is in units of clock cycles.
881 * host->clock is in Hz. target_timeout is in us.
882 * Hence, us = 1000000 * cycles / Hz. Round up.
883 */
884 val = 1000000ULL * data->timeout_clks;
885 if (do_div(val, host->clock))
886 target_timeout++;
887 target_timeout += val;
888 }
889 }
890
891 return target_timeout;
892}
893
894static void sdhci_calc_sw_timeout(struct sdhci_host *host,
895 struct mmc_command *cmd)
896{
897 struct mmc_data *data = cmd->data;
898 struct mmc_host *mmc = host->mmc;
899 struct mmc_ios *ios = &mmc->ios;
900 unsigned char bus_width = 1 << ios->bus_width;
901 unsigned int blksz;
902 unsigned int freq;
903 u64 target_timeout;
904 u64 transfer_time;
905
906 target_timeout = sdhci_target_timeout(host, cmd, data);
907 target_timeout *= NSEC_PER_USEC;
908
909 if (data) {
910 blksz = data->blksz;
911 freq = host->mmc->actual_clock ? : host->clock;
912 transfer_time = (u64)blksz * NSEC_PER_SEC * (8 / bus_width);
913 do_div(transfer_time, freq);
914 /* multiply by '2' to account for any unknowns */
915 transfer_time = transfer_time * 2;
916 /* calculate timeout for the entire data */
917 host->data_timeout = data->blocks * target_timeout +
918 transfer_time;
919 } else {
920 host->data_timeout = target_timeout;
921 }
922
923 if (host->data_timeout)
924 host->data_timeout += MMC_CMD_TRANSFER_TIME;
925}
926
927static u8 sdhci_calc_timeout(struct sdhci_host *host, struct mmc_command *cmd,
928 bool *too_big)
929{
930 u8 count;
931 struct mmc_data *data;
932 unsigned target_timeout, current_timeout;
933
934 *too_big = true;
935
936 /*
937 * If the host controller provides us with an incorrect timeout
938 * value, just skip the check and use 0xE. The hardware may take
939 * longer to time out, but that's much better than having a too-short
940 * timeout value.
941 */
942 if (host->quirks & SDHCI_QUIRK_BROKEN_TIMEOUT_VAL)
943 return 0xE;
944
945 /* Unspecified command, asume max */
946 if (cmd == NULL)
947 return 0xE;
948
949 data = cmd->data;
950 /* Unspecified timeout, assume max */
951 if (!data && !cmd->busy_timeout)
952 return 0xE;
953
954 /* timeout in us */
955 target_timeout = sdhci_target_timeout(host, cmd, data);
956
957 /*
958 * Figure out needed cycles.
959 * We do this in steps in order to fit inside a 32 bit int.
960 * The first step is the minimum timeout, which will have a
961 * minimum resolution of 6 bits:
962 * (1) 2^13*1000 > 2^22,
963 * (2) host->timeout_clk < 2^16
964 * =>
965 * (1) / (2) > 2^6
966 */
967 count = 0;
968 current_timeout = (1 << 13) * 1000 / host->timeout_clk;
969 while (current_timeout < target_timeout) {
970 count++;
971 current_timeout <<= 1;
972 if (count >= 0xF)
973 break;
974 }
975
976 if (count >= 0xF) {
977 if (!(host->quirks2 & SDHCI_QUIRK2_DISABLE_HW_TIMEOUT))
978 DBG("Too large timeout 0x%x requested for CMD%d!\n",
979 count, cmd->opcode);
980 count = 0xE;
981 } else {
982 *too_big = false;
983 }
984
985 return count;
986}
987
988static void sdhci_set_transfer_irqs(struct sdhci_host *host)
989{
990 u32 pio_irqs = SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL;
991 u32 dma_irqs = SDHCI_INT_DMA_END | SDHCI_INT_ADMA_ERROR;
992
993 if (host->flags & SDHCI_REQ_USE_DMA)
994 host->ier = (host->ier & ~pio_irqs) | dma_irqs;
995 else
996 host->ier = (host->ier & ~dma_irqs) | pio_irqs;
997
998 if (host->flags & (SDHCI_AUTO_CMD23 | SDHCI_AUTO_CMD12))
999 host->ier |= SDHCI_INT_AUTO_CMD_ERR;
1000 else
1001 host->ier &= ~SDHCI_INT_AUTO_CMD_ERR;
1002
1003 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
1004 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
1005}
1006
1007void sdhci_set_data_timeout_irq(struct sdhci_host *host, bool enable)
1008{
1009 if (enable)
1010 host->ier |= SDHCI_INT_DATA_TIMEOUT;
1011 else
1012 host->ier &= ~SDHCI_INT_DATA_TIMEOUT;
1013 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
1014 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
1015}
1016EXPORT_SYMBOL_GPL(sdhci_set_data_timeout_irq);
1017
1018void __sdhci_set_timeout(struct sdhci_host *host, struct mmc_command *cmd)
1019{
1020 bool too_big = false;
1021 u8 count = sdhci_calc_timeout(host, cmd, &too_big);
1022
1023 if (too_big &&
1024 host->quirks2 & SDHCI_QUIRK2_DISABLE_HW_TIMEOUT) {
1025 sdhci_calc_sw_timeout(host, cmd);
1026 sdhci_set_data_timeout_irq(host, false);
1027 } else if (!(host->ier & SDHCI_INT_DATA_TIMEOUT)) {
1028 sdhci_set_data_timeout_irq(host, true);
1029 }
1030
1031 sdhci_writeb(host, count, SDHCI_TIMEOUT_CONTROL);
1032}
1033EXPORT_SYMBOL_GPL(__sdhci_set_timeout);
1034
1035static void sdhci_set_timeout(struct sdhci_host *host, struct mmc_command *cmd)
1036{
1037 if (host->ops->set_timeout)
1038 host->ops->set_timeout(host, cmd);
1039 else
1040 __sdhci_set_timeout(host, cmd);
1041}
1042
1043static void sdhci_initialize_data(struct sdhci_host *host,
1044 struct mmc_data *data)
1045{
1046 WARN_ON(host->data);
1047
1048 /* Sanity checks */
1049 BUG_ON(data->blksz * data->blocks > 524288);
1050 BUG_ON(data->blksz > host->mmc->max_blk_size);
1051 BUG_ON(data->blocks > 65535);
1052
1053 host->data = data;
1054 host->data_early = 0;
1055 host->data->bytes_xfered = 0;
1056}
1057
1058static inline void sdhci_set_block_info(struct sdhci_host *host,
1059 struct mmc_data *data)
1060{
1061 /* Set the DMA boundary value and block size */
1062 sdhci_writew(host,
1063 SDHCI_MAKE_BLKSZ(host->sdma_boundary, data->blksz),
1064 SDHCI_BLOCK_SIZE);
1065 /*
1066 * For Version 4.10 onwards, if v4 mode is enabled, 32-bit Block Count
1067 * can be supported, in that case 16-bit block count register must be 0.
1068 */
1069 if (host->version >= SDHCI_SPEC_410 && host->v4_mode &&
1070 (host->quirks2 & SDHCI_QUIRK2_USE_32BIT_BLK_CNT)) {
1071 if (sdhci_readw(host, SDHCI_BLOCK_COUNT))
1072 sdhci_writew(host, 0, SDHCI_BLOCK_COUNT);
1073 sdhci_writew(host, data->blocks, SDHCI_32BIT_BLK_CNT);
1074 } else {
1075 sdhci_writew(host, data->blocks, SDHCI_BLOCK_COUNT);
1076 }
1077}
1078
1079static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd)
1080{
1081 struct mmc_data *data = cmd->data;
1082
1083 sdhci_initialize_data(host, data);
1084
1085 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
1086 struct scatterlist *sg;
1087 unsigned int length_mask, offset_mask;
1088 int i;
1089
1090 host->flags |= SDHCI_REQ_USE_DMA;
1091
1092 /*
1093 * FIXME: This doesn't account for merging when mapping the
1094 * scatterlist.
1095 *
1096 * The assumption here being that alignment and lengths are
1097 * the same after DMA mapping to device address space.
1098 */
1099 length_mask = 0;
1100 offset_mask = 0;
1101 if (host->flags & SDHCI_USE_ADMA) {
1102 if (host->quirks & SDHCI_QUIRK_32BIT_ADMA_SIZE) {
1103 length_mask = 3;
1104 /*
1105 * As we use up to 3 byte chunks to work
1106 * around alignment problems, we need to
1107 * check the offset as well.
1108 */
1109 offset_mask = 3;
1110 }
1111 } else {
1112 if (host->quirks & SDHCI_QUIRK_32BIT_DMA_SIZE)
1113 length_mask = 3;
1114 if (host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR)
1115 offset_mask = 3;
1116 }
1117
1118 if (unlikely(length_mask | offset_mask)) {
1119 for_each_sg(data->sg, sg, data->sg_len, i) {
1120 if (sg->length & length_mask) {
1121 DBG("Reverting to PIO because of transfer size (%d)\n",
1122 sg->length);
1123 host->flags &= ~SDHCI_REQ_USE_DMA;
1124 break;
1125 }
1126 if (sg->offset & offset_mask) {
1127 DBG("Reverting to PIO because of bad alignment\n");
1128 host->flags &= ~SDHCI_REQ_USE_DMA;
1129 break;
1130 }
1131 }
1132 }
1133 }
1134
1135 if (host->flags & SDHCI_REQ_USE_DMA) {
1136 int sg_cnt = sdhci_pre_dma_transfer(host, data, COOKIE_MAPPED);
1137
1138 if (sg_cnt <= 0) {
1139 /*
1140 * This only happens when someone fed
1141 * us an invalid request.
1142 */
1143 WARN_ON(1);
1144 host->flags &= ~SDHCI_REQ_USE_DMA;
1145 } else if (host->flags & SDHCI_USE_ADMA) {
1146 sdhci_adma_table_pre(host, data, sg_cnt);
1147 sdhci_set_adma_addr(host, host->adma_addr);
1148 } else {
1149 WARN_ON(sg_cnt != 1);
1150 sdhci_set_sdma_addr(host, sdhci_sdma_address(host));
1151 }
1152 }
1153
1154 sdhci_config_dma(host);
1155
1156 if (!(host->flags & SDHCI_REQ_USE_DMA)) {
1157 int flags;
1158
1159 flags = SG_MITER_ATOMIC;
1160 if (host->data->flags & MMC_DATA_READ)
1161 flags |= SG_MITER_TO_SG;
1162 else
1163 flags |= SG_MITER_FROM_SG;
1164 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
1165 host->blocks = data->blocks;
1166 }
1167
1168 sdhci_set_transfer_irqs(host);
1169
1170 sdhci_set_block_info(host, data);
1171}
1172
1173#if IS_ENABLED(CONFIG_MMC_SDHCI_EXTERNAL_DMA)
1174
1175static int sdhci_external_dma_init(struct sdhci_host *host)
1176{
1177 int ret = 0;
1178 struct mmc_host *mmc = host->mmc;
1179
1180 host->tx_chan = dma_request_chan(mmc->parent, "tx");
1181 if (IS_ERR(host->tx_chan)) {
1182 ret = PTR_ERR(host->tx_chan);
1183 if (ret != -EPROBE_DEFER)
1184 pr_warn("Failed to request TX DMA channel.\n");
1185 host->tx_chan = NULL;
1186 return ret;
1187 }
1188
1189 host->rx_chan = dma_request_chan(mmc->parent, "rx");
1190 if (IS_ERR(host->rx_chan)) {
1191 if (host->tx_chan) {
1192 dma_release_channel(host->tx_chan);
1193 host->tx_chan = NULL;
1194 }
1195
1196 ret = PTR_ERR(host->rx_chan);
1197 if (ret != -EPROBE_DEFER)
1198 pr_warn("Failed to request RX DMA channel.\n");
1199 host->rx_chan = NULL;
1200 }
1201
1202 return ret;
1203}
1204
1205static struct dma_chan *sdhci_external_dma_channel(struct sdhci_host *host,
1206 struct mmc_data *data)
1207{
1208 return data->flags & MMC_DATA_WRITE ? host->tx_chan : host->rx_chan;
1209}
1210
1211static int sdhci_external_dma_setup(struct sdhci_host *host,
1212 struct mmc_command *cmd)
1213{
1214 int ret, i;
1215 enum dma_transfer_direction dir;
1216 struct dma_async_tx_descriptor *desc;
1217 struct mmc_data *data = cmd->data;
1218 struct dma_chan *chan;
1219 struct dma_slave_config cfg;
1220 dma_cookie_t cookie;
1221 int sg_cnt;
1222
1223 if (!host->mapbase)
1224 return -EINVAL;
1225
1226 cfg.src_addr = host->mapbase + SDHCI_BUFFER;
1227 cfg.dst_addr = host->mapbase + SDHCI_BUFFER;
1228 cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
1229 cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
1230 cfg.src_maxburst = data->blksz / 4;
1231 cfg.dst_maxburst = data->blksz / 4;
1232
1233 /* Sanity check: all the SG entries must be aligned by block size. */
1234 for (i = 0; i < data->sg_len; i++) {
1235 if ((data->sg + i)->length % data->blksz)
1236 return -EINVAL;
1237 }
1238
1239 chan = sdhci_external_dma_channel(host, data);
1240
1241 ret = dmaengine_slave_config(chan, &cfg);
1242 if (ret)
1243 return ret;
1244
1245 sg_cnt = sdhci_pre_dma_transfer(host, data, COOKIE_MAPPED);
1246 if (sg_cnt <= 0)
1247 return -EINVAL;
1248
1249 dir = data->flags & MMC_DATA_WRITE ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;
1250 desc = dmaengine_prep_slave_sg(chan, data->sg, data->sg_len, dir,
1251 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1252 if (!desc)
1253 return -EINVAL;
1254
1255 desc->callback = NULL;
1256 desc->callback_param = NULL;
1257
1258 cookie = dmaengine_submit(desc);
1259 if (dma_submit_error(cookie))
1260 ret = cookie;
1261
1262 return ret;
1263}
1264
1265static void sdhci_external_dma_release(struct sdhci_host *host)
1266{
1267 if (host->tx_chan) {
1268 dma_release_channel(host->tx_chan);
1269 host->tx_chan = NULL;
1270 }
1271
1272 if (host->rx_chan) {
1273 dma_release_channel(host->rx_chan);
1274 host->rx_chan = NULL;
1275 }
1276
1277 sdhci_switch_external_dma(host, false);
1278}
1279
1280static void __sdhci_external_dma_prepare_data(struct sdhci_host *host,
1281 struct mmc_command *cmd)
1282{
1283 struct mmc_data *data = cmd->data;
1284
1285 sdhci_initialize_data(host, data);
1286
1287 host->flags |= SDHCI_REQ_USE_DMA;
1288 sdhci_set_transfer_irqs(host);
1289
1290 sdhci_set_block_info(host, data);
1291}
1292
1293static void sdhci_external_dma_prepare_data(struct sdhci_host *host,
1294 struct mmc_command *cmd)
1295{
1296 if (!sdhci_external_dma_setup(host, cmd)) {
1297 __sdhci_external_dma_prepare_data(host, cmd);
1298 } else {
1299 sdhci_external_dma_release(host);
1300 pr_err("%s: Cannot use external DMA, switch to the DMA/PIO which standard SDHCI provides.\n",
1301 mmc_hostname(host->mmc));
1302 sdhci_prepare_data(host, cmd);
1303 }
1304}
1305
1306static void sdhci_external_dma_pre_transfer(struct sdhci_host *host,
1307 struct mmc_command *cmd)
1308{
1309 struct dma_chan *chan;
1310
1311 if (!cmd->data)
1312 return;
1313
1314 chan = sdhci_external_dma_channel(host, cmd->data);
1315 if (chan)
1316 dma_async_issue_pending(chan);
1317}
1318
1319#else
1320
1321static inline int sdhci_external_dma_init(struct sdhci_host *host)
1322{
1323 return -EOPNOTSUPP;
1324}
1325
1326static inline void sdhci_external_dma_release(struct sdhci_host *host)
1327{
1328}
1329
1330static inline void sdhci_external_dma_prepare_data(struct sdhci_host *host,
1331 struct mmc_command *cmd)
1332{
1333 /* This should never happen */
1334 WARN_ON_ONCE(1);
1335}
1336
1337static inline void sdhci_external_dma_pre_transfer(struct sdhci_host *host,
1338 struct mmc_command *cmd)
1339{
1340}
1341
1342static inline struct dma_chan *sdhci_external_dma_channel(struct sdhci_host *host,
1343 struct mmc_data *data)
1344{
1345 return NULL;
1346}
1347
1348#endif
1349
1350void sdhci_switch_external_dma(struct sdhci_host *host, bool en)
1351{
1352 host->use_external_dma = en;
1353}
1354EXPORT_SYMBOL_GPL(sdhci_switch_external_dma);
1355
1356static inline bool sdhci_auto_cmd12(struct sdhci_host *host,
1357 struct mmc_request *mrq)
1358{
1359 return !mrq->sbc && (host->flags & SDHCI_AUTO_CMD12) &&
1360 !mrq->cap_cmd_during_tfr;
1361}
1362
1363static inline bool sdhci_auto_cmd23(struct sdhci_host *host,
1364 struct mmc_request *mrq)
1365{
1366 return mrq->sbc && (host->flags & SDHCI_AUTO_CMD23);
1367}
1368
1369static inline bool sdhci_manual_cmd23(struct sdhci_host *host,
1370 struct mmc_request *mrq)
1371{
1372 return mrq->sbc && !(host->flags & SDHCI_AUTO_CMD23);
1373}
1374
1375static inline void sdhci_auto_cmd_select(struct sdhci_host *host,
1376 struct mmc_command *cmd,
1377 u16 *mode)
1378{
1379 bool use_cmd12 = sdhci_auto_cmd12(host, cmd->mrq) &&
1380 (cmd->opcode != SD_IO_RW_EXTENDED);
1381 bool use_cmd23 = sdhci_auto_cmd23(host, cmd->mrq);
1382 u16 ctrl2;
1383
1384 /*
1385 * In case of Version 4.10 or later, use of 'Auto CMD Auto
1386 * Select' is recommended rather than use of 'Auto CMD12
1387 * Enable' or 'Auto CMD23 Enable'.
1388 */
1389 if (host->version >= SDHCI_SPEC_410 && (use_cmd12 || use_cmd23)) {
1390 *mode |= SDHCI_TRNS_AUTO_SEL;
1391
1392 ctrl2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1393 if (use_cmd23)
1394 ctrl2 |= SDHCI_CMD23_ENABLE;
1395 else
1396 ctrl2 &= ~SDHCI_CMD23_ENABLE;
1397 sdhci_writew(host, ctrl2, SDHCI_HOST_CONTROL2);
1398
1399 return;
1400 }
1401
1402 /*
1403 * If we are sending CMD23, CMD12 never gets sent
1404 * on successful completion (so no Auto-CMD12).
1405 */
1406 if (use_cmd12)
1407 *mode |= SDHCI_TRNS_AUTO_CMD12;
1408 else if (use_cmd23)
1409 *mode |= SDHCI_TRNS_AUTO_CMD23;
1410}
1411
1412static void sdhci_set_transfer_mode(struct sdhci_host *host,
1413 struct mmc_command *cmd)
1414{
1415 u16 mode = 0;
1416 struct mmc_data *data = cmd->data;
1417
1418 if (data == NULL) {
1419 if (host->quirks2 &
1420 SDHCI_QUIRK2_CLEAR_TRANSFERMODE_REG_BEFORE_CMD) {
1421 /* must not clear SDHCI_TRANSFER_MODE when tuning */
1422 if (cmd->opcode != MMC_SEND_TUNING_BLOCK_HS200)
1423 sdhci_writew(host, 0x0, SDHCI_TRANSFER_MODE);
1424 } else {
1425 /* clear Auto CMD settings for no data CMDs */
1426 mode = sdhci_readw(host, SDHCI_TRANSFER_MODE);
1427 sdhci_writew(host, mode & ~(SDHCI_TRNS_AUTO_CMD12 |
1428 SDHCI_TRNS_AUTO_CMD23), SDHCI_TRANSFER_MODE);
1429 }
1430 return;
1431 }
1432
1433 WARN_ON(!host->data);
1434
1435 if (!(host->quirks2 & SDHCI_QUIRK2_SUPPORT_SINGLE))
1436 mode = SDHCI_TRNS_BLK_CNT_EN;
1437
1438 if (mmc_op_multi(cmd->opcode) || data->blocks > 1) {
1439 mode = SDHCI_TRNS_BLK_CNT_EN | SDHCI_TRNS_MULTI;
1440 sdhci_auto_cmd_select(host, cmd, &mode);
1441 if (sdhci_auto_cmd23(host, cmd->mrq))
1442 sdhci_writel(host, cmd->mrq->sbc->arg, SDHCI_ARGUMENT2);
1443 }
1444
1445 if (data->flags & MMC_DATA_READ)
1446 mode |= SDHCI_TRNS_READ;
1447 if (host->flags & SDHCI_REQ_USE_DMA)
1448 mode |= SDHCI_TRNS_DMA;
1449
1450 sdhci_writew(host, mode, SDHCI_TRANSFER_MODE);
1451}
1452
1453static bool sdhci_needs_reset(struct sdhci_host *host, struct mmc_request *mrq)
1454{
1455 return (!(host->flags & SDHCI_DEVICE_DEAD) &&
1456 ((mrq->cmd && mrq->cmd->error) ||
1457 (mrq->sbc && mrq->sbc->error) ||
1458 (mrq->data && mrq->data->stop && mrq->data->stop->error) ||
1459 (host->quirks & SDHCI_QUIRK_RESET_AFTER_REQUEST)));
1460}
1461
1462static void sdhci_set_mrq_done(struct sdhci_host *host, struct mmc_request *mrq)
1463{
1464 int i;
1465
1466 for (i = 0; i < SDHCI_MAX_MRQS; i++) {
1467 if (host->mrqs_done[i] == mrq) {
1468 WARN_ON(1);
1469 return;
1470 }
1471 }
1472
1473 for (i = 0; i < SDHCI_MAX_MRQS; i++) {
1474 if (!host->mrqs_done[i]) {
1475 host->mrqs_done[i] = mrq;
1476 break;
1477 }
1478 }
1479
1480 WARN_ON(i >= SDHCI_MAX_MRQS);
1481}
1482
1483static void __sdhci_finish_mrq(struct sdhci_host *host, struct mmc_request *mrq)
1484{
1485 if (host->cmd && host->cmd->mrq == mrq)
1486 host->cmd = NULL;
1487
1488 if (host->data_cmd && host->data_cmd->mrq == mrq)
1489 host->data_cmd = NULL;
1490
1491 if (host->deferred_cmd && host->deferred_cmd->mrq == mrq)
1492 host->deferred_cmd = NULL;
1493
1494 if (host->data && host->data->mrq == mrq)
1495 host->data = NULL;
1496
1497 if (sdhci_needs_reset(host, mrq))
1498 host->pending_reset = true;
1499
1500 sdhci_set_mrq_done(host, mrq);
1501
1502 sdhci_del_timer(host, mrq);
1503
1504 if (!sdhci_has_requests(host))
1505 sdhci_led_deactivate(host);
1506}
1507
1508static void sdhci_finish_mrq(struct sdhci_host *host, struct mmc_request *mrq)
1509{
1510 __sdhci_finish_mrq(host, mrq);
1511
1512 queue_work(host->complete_wq, &host->complete_work);
1513}
1514
1515static void __sdhci_finish_data(struct sdhci_host *host, bool sw_data_timeout)
1516{
1517 struct mmc_command *data_cmd = host->data_cmd;
1518 struct mmc_data *data = host->data;
1519
1520 host->data = NULL;
1521 host->data_cmd = NULL;
1522
1523 /*
1524 * The controller needs a reset of internal state machines upon error
1525 * conditions.
1526 */
1527 if (data->error) {
1528 if (!host->cmd || host->cmd == data_cmd)
1529 sdhci_do_reset(host, SDHCI_RESET_CMD);
1530 sdhci_do_reset(host, SDHCI_RESET_DATA);
1531 }
1532
1533 if ((host->flags & (SDHCI_REQ_USE_DMA | SDHCI_USE_ADMA)) ==
1534 (SDHCI_REQ_USE_DMA | SDHCI_USE_ADMA))
1535 sdhci_adma_table_post(host, data);
1536
1537 /*
1538 * The specification states that the block count register must
1539 * be updated, but it does not specify at what point in the
1540 * data flow. That makes the register entirely useless to read
1541 * back so we have to assume that nothing made it to the card
1542 * in the event of an error.
1543 */
1544 if (data->error)
1545 data->bytes_xfered = 0;
1546 else
1547 data->bytes_xfered = data->blksz * data->blocks;
1548
1549 /*
1550 * Need to send CMD12 if -
1551 * a) open-ended multiblock transfer not using auto CMD12 (no CMD23)
1552 * b) error in multiblock transfer
1553 */
1554 if (data->stop &&
1555 ((!data->mrq->sbc && !sdhci_auto_cmd12(host, data->mrq)) ||
1556 data->error)) {
1557 /*
1558 * 'cap_cmd_during_tfr' request must not use the command line
1559 * after mmc_command_done() has been called. It is upper layer's
1560 * responsibility to send the stop command if required.
1561 */
1562 if (data->mrq->cap_cmd_during_tfr) {
1563 __sdhci_finish_mrq(host, data->mrq);
1564 } else {
1565 /* Avoid triggering warning in sdhci_send_command() */
1566 host->cmd = NULL;
1567 if (!sdhci_send_command(host, data->stop)) {
1568 if (sw_data_timeout) {
1569 /*
1570 * This is anyway a sw data timeout, so
1571 * give up now.
1572 */
1573 data->stop->error = -EIO;
1574 __sdhci_finish_mrq(host, data->mrq);
1575 } else {
1576 WARN_ON(host->deferred_cmd);
1577 host->deferred_cmd = data->stop;
1578 }
1579 }
1580 }
1581 } else {
1582 __sdhci_finish_mrq(host, data->mrq);
1583 }
1584}
1585
1586static void sdhci_finish_data(struct sdhci_host *host)
1587{
1588 __sdhci_finish_data(host, false);
1589}
1590
1591static bool sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
1592{
1593 int flags;
1594 u32 mask;
1595 unsigned long timeout;
1596
1597 WARN_ON(host->cmd);
1598
1599 /* Initially, a command has no error */
1600 cmd->error = 0;
1601
1602 if ((host->quirks2 & SDHCI_QUIRK2_STOP_WITH_TC) &&
1603 cmd->opcode == MMC_STOP_TRANSMISSION)
1604 cmd->flags |= MMC_RSP_BUSY;
1605
1606 mask = SDHCI_CMD_INHIBIT;
1607 if (sdhci_data_line_cmd(cmd))
1608 mask |= SDHCI_DATA_INHIBIT;
1609
1610 /* We shouldn't wait for data inihibit for stop commands, even
1611 though they might use busy signaling */
1612 if (cmd->mrq->data && (cmd == cmd->mrq->data->stop))
1613 mask &= ~SDHCI_DATA_INHIBIT;
1614
1615 if (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask)
1616 return false;
1617
1618 host->cmd = cmd;
1619 host->data_timeout = 0;
1620 if (sdhci_data_line_cmd(cmd)) {
1621 WARN_ON(host->data_cmd);
1622 host->data_cmd = cmd;
1623 sdhci_set_timeout(host, cmd);
1624 }
1625
1626 if (cmd->data) {
1627 if (host->use_external_dma)
1628 sdhci_external_dma_prepare_data(host, cmd);
1629 else
1630 sdhci_prepare_data(host, cmd);
1631 }
1632
1633 sdhci_writel(host, cmd->arg, SDHCI_ARGUMENT);
1634
1635 sdhci_set_transfer_mode(host, cmd);
1636
1637 if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
1638 WARN_ONCE(1, "Unsupported response type!\n");
1639 /*
1640 * This does not happen in practice because 136-bit response
1641 * commands never have busy waiting, so rather than complicate
1642 * the error path, just remove busy waiting and continue.
1643 */
1644 cmd->flags &= ~MMC_RSP_BUSY;
1645 }
1646
1647 if (!(cmd->flags & MMC_RSP_PRESENT))
1648 flags = SDHCI_CMD_RESP_NONE;
1649 else if (cmd->flags & MMC_RSP_136)
1650 flags = SDHCI_CMD_RESP_LONG;
1651 else if (cmd->flags & MMC_RSP_BUSY)
1652 flags = SDHCI_CMD_RESP_SHORT_BUSY;
1653 else
1654 flags = SDHCI_CMD_RESP_SHORT;
1655
1656 if (cmd->flags & MMC_RSP_CRC)
1657 flags |= SDHCI_CMD_CRC;
1658 if (cmd->flags & MMC_RSP_OPCODE)
1659 flags |= SDHCI_CMD_INDEX;
1660
1661 /* CMD19 is special in that the Data Present Select should be set */
1662 if (cmd->data || cmd->opcode == MMC_SEND_TUNING_BLOCK ||
1663 cmd->opcode == MMC_SEND_TUNING_BLOCK_HS200)
1664 flags |= SDHCI_CMD_DATA;
1665
1666 timeout = jiffies;
1667 if (host->data_timeout)
1668 timeout += nsecs_to_jiffies(host->data_timeout);
1669 else if (!cmd->data && cmd->busy_timeout > 9000)
1670 timeout += DIV_ROUND_UP(cmd->busy_timeout, 1000) * HZ + HZ;
1671 else
1672 timeout += 10 * HZ;
1673 sdhci_mod_timer(host, cmd->mrq, timeout);
1674
1675 if (host->use_external_dma)
1676 sdhci_external_dma_pre_transfer(host, cmd);
1677
1678 sdhci_writew(host, SDHCI_MAKE_CMD(cmd->opcode, flags), SDHCI_COMMAND);
1679
1680 return true;
1681}
1682
1683static bool sdhci_present_error(struct sdhci_host *host,
1684 struct mmc_command *cmd, bool present)
1685{
1686 if (!present || host->flags & SDHCI_DEVICE_DEAD) {
1687 cmd->error = -ENOMEDIUM;
1688 return true;
1689 }
1690
1691 return false;
1692}
1693
1694static bool sdhci_send_command_retry(struct sdhci_host *host,
1695 struct mmc_command *cmd,
1696 unsigned long flags)
1697 __releases(host->lock)
1698 __acquires(host->lock)
1699{
1700 struct mmc_command *deferred_cmd = host->deferred_cmd;
1701 int timeout = 10; /* Approx. 10 ms */
1702 bool present;
1703
1704 while (!sdhci_send_command(host, cmd)) {
1705 if (!timeout--) {
1706 pr_err("%s: Controller never released inhibit bit(s).\n",
1707 mmc_hostname(host->mmc));
1708 sdhci_dumpregs(host);
1709 cmd->error = -EIO;
1710 return false;
1711 }
1712
1713 spin_unlock_irqrestore(&host->lock, flags);
1714
1715 usleep_range(1000, 1250);
1716
1717 present = host->mmc->ops->get_cd(host->mmc);
1718
1719 spin_lock_irqsave(&host->lock, flags);
1720
1721 /* A deferred command might disappear, handle that */
1722 if (cmd == deferred_cmd && cmd != host->deferred_cmd)
1723 return true;
1724
1725 if (sdhci_present_error(host, cmd, present))
1726 return false;
1727 }
1728
1729 if (cmd == host->deferred_cmd)
1730 host->deferred_cmd = NULL;
1731
1732 return true;
1733}
1734
1735static void sdhci_read_rsp_136(struct sdhci_host *host, struct mmc_command *cmd)
1736{
1737 int i, reg;
1738
1739 for (i = 0; i < 4; i++) {
1740 reg = SDHCI_RESPONSE + (3 - i) * 4;
1741 cmd->resp[i] = sdhci_readl(host, reg);
1742 }
1743
1744 if (host->quirks2 & SDHCI_QUIRK2_RSP_136_HAS_CRC)
1745 return;
1746
1747 /* CRC is stripped so we need to do some shifting */
1748 for (i = 0; i < 4; i++) {
1749 cmd->resp[i] <<= 8;
1750 if (i != 3)
1751 cmd->resp[i] |= cmd->resp[i + 1] >> 24;
1752 }
1753}
1754
1755static void sdhci_finish_command(struct sdhci_host *host)
1756{
1757 struct mmc_command *cmd = host->cmd;
1758
1759 host->cmd = NULL;
1760
1761 if (cmd->flags & MMC_RSP_PRESENT) {
1762 if (cmd->flags & MMC_RSP_136) {
1763 sdhci_read_rsp_136(host, cmd);
1764 } else {
1765 cmd->resp[0] = sdhci_readl(host, SDHCI_RESPONSE);
1766 }
1767 }
1768
1769 if (cmd->mrq->cap_cmd_during_tfr && cmd == cmd->mrq->cmd)
1770 mmc_command_done(host->mmc, cmd->mrq);
1771
1772 /*
1773 * The host can send and interrupt when the busy state has
1774 * ended, allowing us to wait without wasting CPU cycles.
1775 * The busy signal uses DAT0 so this is similar to waiting
1776 * for data to complete.
1777 *
1778 * Note: The 1.0 specification is a bit ambiguous about this
1779 * feature so there might be some problems with older
1780 * controllers.
1781 */
1782 if (cmd->flags & MMC_RSP_BUSY) {
1783 if (cmd->data) {
1784 DBG("Cannot wait for busy signal when also doing a data transfer");
1785 } else if (!(host->quirks & SDHCI_QUIRK_NO_BUSY_IRQ) &&
1786 cmd == host->data_cmd) {
1787 /* Command complete before busy is ended */
1788 return;
1789 }
1790 }
1791
1792 /* Finished CMD23, now send actual command. */
1793 if (cmd == cmd->mrq->sbc) {
1794 if (!sdhci_send_command(host, cmd->mrq->cmd)) {
1795 WARN_ON(host->deferred_cmd);
1796 host->deferred_cmd = cmd->mrq->cmd;
1797 }
1798 } else {
1799
1800 /* Processed actual command. */
1801 if (host->data && host->data_early)
1802 sdhci_finish_data(host);
1803
1804 if (!cmd->data)
1805 __sdhci_finish_mrq(host, cmd->mrq);
1806 }
1807}
1808
1809static u16 sdhci_get_preset_value(struct sdhci_host *host)
1810{
1811 u16 preset = 0;
1812
1813 switch (host->timing) {
1814 case MMC_TIMING_UHS_SDR12:
1815 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR12);
1816 break;
1817 case MMC_TIMING_UHS_SDR25:
1818 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR25);
1819 break;
1820 case MMC_TIMING_UHS_SDR50:
1821 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR50);
1822 break;
1823 case MMC_TIMING_UHS_SDR104:
1824 case MMC_TIMING_MMC_HS200:
1825 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR104);
1826 break;
1827 case MMC_TIMING_UHS_DDR50:
1828 case MMC_TIMING_MMC_DDR52:
1829 preset = sdhci_readw(host, SDHCI_PRESET_FOR_DDR50);
1830 break;
1831 case MMC_TIMING_MMC_HS400:
1832 preset = sdhci_readw(host, SDHCI_PRESET_FOR_HS400);
1833 break;
1834 default:
1835 pr_warn("%s: Invalid UHS-I mode selected\n",
1836 mmc_hostname(host->mmc));
1837 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR12);
1838 break;
1839 }
1840 return preset;
1841}
1842
1843u16 sdhci_calc_clk(struct sdhci_host *host, unsigned int clock,
1844 unsigned int *actual_clock)
1845{
1846 int div = 0; /* Initialized for compiler warning */
1847 int real_div = div, clk_mul = 1;
1848 u16 clk = 0;
1849 bool switch_base_clk = false;
1850
1851 if (host->version >= SDHCI_SPEC_300) {
1852 if (host->preset_enabled) {
1853 u16 pre_val;
1854
1855 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1856 pre_val = sdhci_get_preset_value(host);
1857 div = FIELD_GET(SDHCI_PRESET_SDCLK_FREQ_MASK, pre_val);
1858 if (host->clk_mul &&
1859 (pre_val & SDHCI_PRESET_CLKGEN_SEL)) {
1860 clk = SDHCI_PROG_CLOCK_MODE;
1861 real_div = div + 1;
1862 clk_mul = host->clk_mul;
1863 } else {
1864 real_div = max_t(int, 1, div << 1);
1865 }
1866 goto clock_set;
1867 }
1868
1869 /*
1870 * Check if the Host Controller supports Programmable Clock
1871 * Mode.
1872 */
1873 if (host->clk_mul) {
1874 for (div = 1; div <= 1024; div++) {
1875 if ((host->max_clk * host->clk_mul / div)
1876 <= clock)
1877 break;
1878 }
1879 if ((host->max_clk * host->clk_mul / div) <= clock) {
1880 /*
1881 * Set Programmable Clock Mode in the Clock
1882 * Control register.
1883 */
1884 clk = SDHCI_PROG_CLOCK_MODE;
1885 real_div = div;
1886 clk_mul = host->clk_mul;
1887 div--;
1888 } else {
1889 /*
1890 * Divisor can be too small to reach clock
1891 * speed requirement. Then use the base clock.
1892 */
1893 switch_base_clk = true;
1894 }
1895 }
1896
1897 if (!host->clk_mul || switch_base_clk) {
1898 /* Version 3.00 divisors must be a multiple of 2. */
1899 if (host->max_clk <= clock)
1900 div = 1;
1901 else {
1902 for (div = 2; div < SDHCI_MAX_DIV_SPEC_300;
1903 div += 2) {
1904 if ((host->max_clk / div) <= clock)
1905 break;
1906 }
1907 }
1908 real_div = div;
1909 div >>= 1;
1910 if ((host->quirks2 & SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN)
1911 && !div && host->max_clk <= 25000000)
1912 div = 1;
1913 }
1914 } else {
1915 /* Version 2.00 divisors must be a power of 2. */
1916 for (div = 1; div < SDHCI_MAX_DIV_SPEC_200; div *= 2) {
1917 if ((host->max_clk / div) <= clock)
1918 break;
1919 }
1920 real_div = div;
1921 div >>= 1;
1922 }
1923
1924clock_set:
1925 if (real_div)
1926 *actual_clock = (host->max_clk * clk_mul) / real_div;
1927 clk |= (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT;
1928 clk |= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN)
1929 << SDHCI_DIVIDER_HI_SHIFT;
1930
1931 return clk;
1932}
1933EXPORT_SYMBOL_GPL(sdhci_calc_clk);
1934
1935void sdhci_enable_clk(struct sdhci_host *host, u16 clk)
1936{
1937 ktime_t timeout;
1938
1939 clk |= SDHCI_CLOCK_INT_EN;
1940 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1941
1942 /* Wait max 150 ms */
1943 timeout = ktime_add_ms(ktime_get(), 150);
1944 while (1) {
1945 bool timedout = ktime_after(ktime_get(), timeout);
1946
1947 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1948 if (clk & SDHCI_CLOCK_INT_STABLE)
1949 break;
1950 if (timedout) {
1951 pr_err("%s: Internal clock never stabilised.\n",
1952 mmc_hostname(host->mmc));
1953 sdhci_dumpregs(host);
1954 return;
1955 }
1956 udelay(10);
1957 }
1958
1959 if (host->version >= SDHCI_SPEC_410 && host->v4_mode) {
1960 clk |= SDHCI_CLOCK_PLL_EN;
1961 clk &= ~SDHCI_CLOCK_INT_STABLE;
1962 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1963
1964 /* Wait max 150 ms */
1965 timeout = ktime_add_ms(ktime_get(), 150);
1966 while (1) {
1967 bool timedout = ktime_after(ktime_get(), timeout);
1968
1969 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1970 if (clk & SDHCI_CLOCK_INT_STABLE)
1971 break;
1972 if (timedout) {
1973 pr_err("%s: PLL clock never stabilised.\n",
1974 mmc_hostname(host->mmc));
1975 sdhci_dumpregs(host);
1976 return;
1977 }
1978 udelay(10);
1979 }
1980 }
1981
1982 clk |= SDHCI_CLOCK_CARD_EN;
1983 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1984}
1985EXPORT_SYMBOL_GPL(sdhci_enable_clk);
1986
1987void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
1988{
1989 u16 clk;
1990
1991 host->mmc->actual_clock = 0;
1992
1993 sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
1994
1995 if (clock == 0)
1996 return;
1997
1998 clk = sdhci_calc_clk(host, clock, &host->mmc->actual_clock);
1999 sdhci_enable_clk(host, clk);
2000}
2001EXPORT_SYMBOL_GPL(sdhci_set_clock);
2002
2003static void sdhci_set_power_reg(struct sdhci_host *host, unsigned char mode,
2004 unsigned short vdd)
2005{
2006 struct mmc_host *mmc = host->mmc;
2007
2008 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
2009
2010 if (mode != MMC_POWER_OFF)
2011 sdhci_writeb(host, SDHCI_POWER_ON, SDHCI_POWER_CONTROL);
2012 else
2013 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
2014}
2015
2016void sdhci_set_power_noreg(struct sdhci_host *host, unsigned char mode,
2017 unsigned short vdd)
2018{
2019 u8 pwr = 0;
2020
2021 if (mode != MMC_POWER_OFF) {
2022 switch (1 << vdd) {
2023 case MMC_VDD_165_195:
2024 /*
2025 * Without a regulator, SDHCI does not support 2.0v
2026 * so we only get here if the driver deliberately
2027 * added the 2.0v range to ocr_avail. Map it to 1.8v
2028 * for the purpose of turning on the power.
2029 */
2030 case MMC_VDD_20_21:
2031 pwr = SDHCI_POWER_180;
2032 break;
2033 case MMC_VDD_29_30:
2034 case MMC_VDD_30_31:
2035 pwr = SDHCI_POWER_300;
2036 break;
2037 case MMC_VDD_32_33:
2038 case MMC_VDD_33_34:
2039 pwr = SDHCI_POWER_330;
2040 break;
2041 default:
2042 WARN(1, "%s: Invalid vdd %#x\n",
2043 mmc_hostname(host->mmc), vdd);
2044 break;
2045 }
2046 }
2047
2048 if (host->pwr == pwr)
2049 return;
2050
2051 host->pwr = pwr;
2052
2053 if (pwr == 0) {
2054 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
2055 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
2056 sdhci_runtime_pm_bus_off(host);
2057 } else {
2058 /*
2059 * Spec says that we should clear the power reg before setting
2060 * a new value. Some controllers don't seem to like this though.
2061 */
2062 if (!(host->quirks & SDHCI_QUIRK_SINGLE_POWER_WRITE))
2063 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
2064
2065 /*
2066 * At least the Marvell CaFe chip gets confused if we set the
2067 * voltage and set turn on power at the same time, so set the
2068 * voltage first.
2069 */
2070 if (host->quirks & SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER)
2071 sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
2072
2073 pwr |= SDHCI_POWER_ON;
2074
2075 sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
2076
2077 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
2078 sdhci_runtime_pm_bus_on(host);
2079
2080 /*
2081 * Some controllers need an extra 10ms delay of 10ms before
2082 * they can apply clock after applying power
2083 */
2084 if (host->quirks & SDHCI_QUIRK_DELAY_AFTER_POWER)
2085 mdelay(10);
2086 }
2087}
2088EXPORT_SYMBOL_GPL(sdhci_set_power_noreg);
2089
2090void sdhci_set_power(struct sdhci_host *host, unsigned char mode,
2091 unsigned short vdd)
2092{
2093 if (IS_ERR(host->mmc->supply.vmmc))
2094 sdhci_set_power_noreg(host, mode, vdd);
2095 else
2096 sdhci_set_power_reg(host, mode, vdd);
2097}
2098EXPORT_SYMBOL_GPL(sdhci_set_power);
2099
2100/*
2101 * Some controllers need to configure a valid bus voltage on their power
2102 * register regardless of whether an external regulator is taking care of power
2103 * supply. This helper function takes care of it if set as the controller's
2104 * sdhci_ops.set_power callback.
2105 */
2106void sdhci_set_power_and_bus_voltage(struct sdhci_host *host,
2107 unsigned char mode,
2108 unsigned short vdd)
2109{
2110 if (!IS_ERR(host->mmc->supply.vmmc)) {
2111 struct mmc_host *mmc = host->mmc;
2112
2113 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
2114 }
2115 sdhci_set_power_noreg(host, mode, vdd);
2116}
2117EXPORT_SYMBOL_GPL(sdhci_set_power_and_bus_voltage);
2118
2119/*****************************************************************************\
2120 * *
2121 * MMC callbacks *
2122 * *
2123\*****************************************************************************/
2124
2125void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
2126{
2127 struct sdhci_host *host = mmc_priv(mmc);
2128 struct mmc_command *cmd;
2129 unsigned long flags;
2130 bool present;
2131
2132 /* Firstly check card presence */
2133 present = mmc->ops->get_cd(mmc);
2134
2135 spin_lock_irqsave(&host->lock, flags);
2136
2137 sdhci_led_activate(host);
2138
2139 if (sdhci_present_error(host, mrq->cmd, present))
2140 goto out_finish;
2141
2142 cmd = sdhci_manual_cmd23(host, mrq) ? mrq->sbc : mrq->cmd;
2143
2144 if (!sdhci_send_command_retry(host, cmd, flags))
2145 goto out_finish;
2146
2147 spin_unlock_irqrestore(&host->lock, flags);
2148
2149 return;
2150
2151out_finish:
2152 sdhci_finish_mrq(host, mrq);
2153 spin_unlock_irqrestore(&host->lock, flags);
2154}
2155EXPORT_SYMBOL_GPL(sdhci_request);
2156
2157int sdhci_request_atomic(struct mmc_host *mmc, struct mmc_request *mrq)
2158{
2159 struct sdhci_host *host = mmc_priv(mmc);
2160 struct mmc_command *cmd;
2161 unsigned long flags;
2162 int ret = 0;
2163
2164 spin_lock_irqsave(&host->lock, flags);
2165
2166 if (sdhci_present_error(host, mrq->cmd, true)) {
2167 sdhci_finish_mrq(host, mrq);
2168 goto out_finish;
2169 }
2170
2171 cmd = sdhci_manual_cmd23(host, mrq) ? mrq->sbc : mrq->cmd;
2172
2173 /*
2174 * The HSQ may send a command in interrupt context without polling
2175 * the busy signaling, which means we should return BUSY if controller
2176 * has not released inhibit bits to allow HSQ trying to send request
2177 * again in non-atomic context. So we should not finish this request
2178 * here.
2179 */
2180 if (!sdhci_send_command(host, cmd))
2181 ret = -EBUSY;
2182 else
2183 sdhci_led_activate(host);
2184
2185out_finish:
2186 spin_unlock_irqrestore(&host->lock, flags);
2187 return ret;
2188}
2189EXPORT_SYMBOL_GPL(sdhci_request_atomic);
2190
2191void sdhci_set_bus_width(struct sdhci_host *host, int width)
2192{
2193 u8 ctrl;
2194
2195 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
2196 if (width == MMC_BUS_WIDTH_8) {
2197 ctrl &= ~SDHCI_CTRL_4BITBUS;
2198 ctrl |= SDHCI_CTRL_8BITBUS;
2199 } else {
2200 if (host->mmc->caps & MMC_CAP_8_BIT_DATA)
2201 ctrl &= ~SDHCI_CTRL_8BITBUS;
2202 if (width == MMC_BUS_WIDTH_4)
2203 ctrl |= SDHCI_CTRL_4BITBUS;
2204 else
2205 ctrl &= ~SDHCI_CTRL_4BITBUS;
2206 }
2207 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
2208}
2209EXPORT_SYMBOL_GPL(sdhci_set_bus_width);
2210
2211void sdhci_set_uhs_signaling(struct sdhci_host *host, unsigned timing)
2212{
2213 u16 ctrl_2;
2214
2215 ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2216 /* Select Bus Speed Mode for host */
2217 ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
2218 if ((timing == MMC_TIMING_MMC_HS200) ||
2219 (timing == MMC_TIMING_UHS_SDR104))
2220 ctrl_2 |= SDHCI_CTRL_UHS_SDR104;
2221 else if (timing == MMC_TIMING_UHS_SDR12)
2222 ctrl_2 |= SDHCI_CTRL_UHS_SDR12;
2223 else if (timing == MMC_TIMING_UHS_SDR25)
2224 ctrl_2 |= SDHCI_CTRL_UHS_SDR25;
2225 else if (timing == MMC_TIMING_UHS_SDR50)
2226 ctrl_2 |= SDHCI_CTRL_UHS_SDR50;
2227 else if ((timing == MMC_TIMING_UHS_DDR50) ||
2228 (timing == MMC_TIMING_MMC_DDR52))
2229 ctrl_2 |= SDHCI_CTRL_UHS_DDR50;
2230 else if (timing == MMC_TIMING_MMC_HS400)
2231 ctrl_2 |= SDHCI_CTRL_HS400; /* Non-standard */
2232 sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
2233}
2234EXPORT_SYMBOL_GPL(sdhci_set_uhs_signaling);
2235
2236void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
2237{
2238 struct sdhci_host *host = mmc_priv(mmc);
2239 u8 ctrl;
2240
2241 if (ios->power_mode == MMC_POWER_UNDEFINED)
2242 return;
2243
2244 if (host->flags & SDHCI_DEVICE_DEAD) {
2245 if (!IS_ERR(mmc->supply.vmmc) &&
2246 ios->power_mode == MMC_POWER_OFF)
2247 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
2248 return;
2249 }
2250
2251 /*
2252 * Reset the chip on each power off.
2253 * Should clear out any weird states.
2254 */
2255 if (ios->power_mode == MMC_POWER_OFF) {
2256 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
2257 sdhci_reinit(host);
2258 }
2259
2260 if (host->version >= SDHCI_SPEC_300 &&
2261 (ios->power_mode == MMC_POWER_UP) &&
2262 !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN))
2263 sdhci_enable_preset_value(host, false);
2264
2265 if (!ios->clock || ios->clock != host->clock) {
2266 host->ops->set_clock(host, ios->clock);
2267 host->clock = ios->clock;
2268
2269 if (host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK &&
2270 host->clock) {
2271 host->timeout_clk = host->mmc->actual_clock ?
2272 host->mmc->actual_clock / 1000 :
2273 host->clock / 1000;
2274 host->mmc->max_busy_timeout =
2275 host->ops->get_max_timeout_count ?
2276 host->ops->get_max_timeout_count(host) :
2277 1 << 27;
2278 host->mmc->max_busy_timeout /= host->timeout_clk;
2279 }
2280 }
2281
2282 if (host->ops->set_power)
2283 host->ops->set_power(host, ios->power_mode, ios->vdd);
2284 else
2285 sdhci_set_power(host, ios->power_mode, ios->vdd);
2286
2287 if (host->ops->platform_send_init_74_clocks)
2288 host->ops->platform_send_init_74_clocks(host, ios->power_mode);
2289
2290 host->ops->set_bus_width(host, ios->bus_width);
2291
2292 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
2293
2294 if (!(host->quirks & SDHCI_QUIRK_NO_HISPD_BIT)) {
2295 if (ios->timing == MMC_TIMING_SD_HS ||
2296 ios->timing == MMC_TIMING_MMC_HS ||
2297 ios->timing == MMC_TIMING_MMC_HS400 ||
2298 ios->timing == MMC_TIMING_MMC_HS200 ||
2299 ios->timing == MMC_TIMING_MMC_DDR52 ||
2300 ios->timing == MMC_TIMING_UHS_SDR50 ||
2301 ios->timing == MMC_TIMING_UHS_SDR104 ||
2302 ios->timing == MMC_TIMING_UHS_DDR50 ||
2303 ios->timing == MMC_TIMING_UHS_SDR25)
2304 ctrl |= SDHCI_CTRL_HISPD;
2305 else
2306 ctrl &= ~SDHCI_CTRL_HISPD;
2307 }
2308
2309 if (host->version >= SDHCI_SPEC_300) {
2310 u16 clk, ctrl_2;
2311
2312 if (!host->preset_enabled) {
2313 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
2314 /*
2315 * We only need to set Driver Strength if the
2316 * preset value enable is not set.
2317 */
2318 ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2319 ctrl_2 &= ~SDHCI_CTRL_DRV_TYPE_MASK;
2320 if (ios->drv_type == MMC_SET_DRIVER_TYPE_A)
2321 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_A;
2322 else if (ios->drv_type == MMC_SET_DRIVER_TYPE_B)
2323 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_B;
2324 else if (ios->drv_type == MMC_SET_DRIVER_TYPE_C)
2325 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_C;
2326 else if (ios->drv_type == MMC_SET_DRIVER_TYPE_D)
2327 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_D;
2328 else {
2329 pr_warn("%s: invalid driver type, default to driver type B\n",
2330 mmc_hostname(mmc));
2331 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_B;
2332 }
2333
2334 sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
2335 } else {
2336 /*
2337 * According to SDHC Spec v3.00, if the Preset Value
2338 * Enable in the Host Control 2 register is set, we
2339 * need to reset SD Clock Enable before changing High
2340 * Speed Enable to avoid generating clock gliches.
2341 */
2342
2343 /* Reset SD Clock Enable */
2344 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
2345 clk &= ~SDHCI_CLOCK_CARD_EN;
2346 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
2347
2348 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
2349
2350 /* Re-enable SD Clock */
2351 host->ops->set_clock(host, host->clock);
2352 }
2353
2354 /* Reset SD Clock Enable */
2355 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
2356 clk &= ~SDHCI_CLOCK_CARD_EN;
2357 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
2358
2359 host->ops->set_uhs_signaling(host, ios->timing);
2360 host->timing = ios->timing;
2361
2362 if (!(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN) &&
2363 ((ios->timing == MMC_TIMING_UHS_SDR12) ||
2364 (ios->timing == MMC_TIMING_UHS_SDR25) ||
2365 (ios->timing == MMC_TIMING_UHS_SDR50) ||
2366 (ios->timing == MMC_TIMING_UHS_SDR104) ||
2367 (ios->timing == MMC_TIMING_UHS_DDR50) ||
2368 (ios->timing == MMC_TIMING_MMC_DDR52))) {
2369 u16 preset;
2370
2371 sdhci_enable_preset_value(host, true);
2372 preset = sdhci_get_preset_value(host);
2373 ios->drv_type = FIELD_GET(SDHCI_PRESET_DRV_MASK,
2374 preset);
2375 }
2376
2377 /* Re-enable SD Clock */
2378 host->ops->set_clock(host, host->clock);
2379 } else
2380 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
2381
2382 /*
2383 * Some (ENE) controllers go apeshit on some ios operation,
2384 * signalling timeout and CRC errors even on CMD0. Resetting
2385 * it on each ios seems to solve the problem.
2386 */
2387 if (host->quirks & SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS)
2388 sdhci_do_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
2389}
2390EXPORT_SYMBOL_GPL(sdhci_set_ios);
2391
2392static int sdhci_get_cd(struct mmc_host *mmc)
2393{
2394 struct sdhci_host *host = mmc_priv(mmc);
2395 int gpio_cd = mmc_gpio_get_cd(mmc);
2396
2397 if (host->flags & SDHCI_DEVICE_DEAD)
2398 return 0;
2399
2400 /* If nonremovable, assume that the card is always present. */
2401 if (!mmc_card_is_removable(host->mmc))
2402 return 1;
2403
2404 /*
2405 * Try slot gpio detect, if defined it take precedence
2406 * over build in controller functionality
2407 */
2408 if (gpio_cd >= 0)
2409 return !!gpio_cd;
2410
2411 /* If polling, assume that the card is always present. */
2412 if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
2413 return 1;
2414
2415 /* Host native card detect */
2416 return !!(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT);
2417}
2418
2419static int sdhci_check_ro(struct sdhci_host *host)
2420{
2421 unsigned long flags;
2422 int is_readonly;
2423
2424 spin_lock_irqsave(&host->lock, flags);
2425
2426 if (host->flags & SDHCI_DEVICE_DEAD)
2427 is_readonly = 0;
2428 else if (host->ops->get_ro)
2429 is_readonly = host->ops->get_ro(host);
2430 else if (mmc_can_gpio_ro(host->mmc))
2431 is_readonly = mmc_gpio_get_ro(host->mmc);
2432 else
2433 is_readonly = !(sdhci_readl(host, SDHCI_PRESENT_STATE)
2434 & SDHCI_WRITE_PROTECT);
2435
2436 spin_unlock_irqrestore(&host->lock, flags);
2437
2438 /* This quirk needs to be replaced by a callback-function later */
2439 return host->quirks & SDHCI_QUIRK_INVERTED_WRITE_PROTECT ?
2440 !is_readonly : is_readonly;
2441}
2442
2443#define SAMPLE_COUNT 5
2444
2445static int sdhci_get_ro(struct mmc_host *mmc)
2446{
2447 struct sdhci_host *host = mmc_priv(mmc);
2448 int i, ro_count;
2449
2450 if (!(host->quirks & SDHCI_QUIRK_UNSTABLE_RO_DETECT))
2451 return sdhci_check_ro(host);
2452
2453 ro_count = 0;
2454 for (i = 0; i < SAMPLE_COUNT; i++) {
2455 if (sdhci_check_ro(host)) {
2456 if (++ro_count > SAMPLE_COUNT / 2)
2457 return 1;
2458 }
2459 msleep(30);
2460 }
2461 return 0;
2462}
2463
2464static void sdhci_hw_reset(struct mmc_host *mmc)
2465{
2466 struct sdhci_host *host = mmc_priv(mmc);
2467
2468 if (host->ops && host->ops->hw_reset)
2469 host->ops->hw_reset(host);
2470}
2471
2472static void sdhci_enable_sdio_irq_nolock(struct sdhci_host *host, int enable)
2473{
2474 if (!(host->flags & SDHCI_DEVICE_DEAD)) {
2475 if (enable)
2476 host->ier |= SDHCI_INT_CARD_INT;
2477 else
2478 host->ier &= ~SDHCI_INT_CARD_INT;
2479
2480 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
2481 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
2482 }
2483}
2484
2485void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable)
2486{
2487 struct sdhci_host *host = mmc_priv(mmc);
2488 unsigned long flags;
2489
2490 if (enable)
2491 pm_runtime_get_noresume(host->mmc->parent);
2492
2493 spin_lock_irqsave(&host->lock, flags);
2494 sdhci_enable_sdio_irq_nolock(host, enable);
2495 spin_unlock_irqrestore(&host->lock, flags);
2496
2497 if (!enable)
2498 pm_runtime_put_noidle(host->mmc->parent);
2499}
2500EXPORT_SYMBOL_GPL(sdhci_enable_sdio_irq);
2501
2502static void sdhci_ack_sdio_irq(struct mmc_host *mmc)
2503{
2504 struct sdhci_host *host = mmc_priv(mmc);
2505 unsigned long flags;
2506
2507 spin_lock_irqsave(&host->lock, flags);
2508 sdhci_enable_sdio_irq_nolock(host, true);
2509 spin_unlock_irqrestore(&host->lock, flags);
2510}
2511
2512int sdhci_start_signal_voltage_switch(struct mmc_host *mmc,
2513 struct mmc_ios *ios)
2514{
2515 struct sdhci_host *host = mmc_priv(mmc);
2516 u16 ctrl;
2517 int ret;
2518
2519 /*
2520 * Signal Voltage Switching is only applicable for Host Controllers
2521 * v3.00 and above.
2522 */
2523 if (host->version < SDHCI_SPEC_300)
2524 return 0;
2525
2526 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2527
2528 switch (ios->signal_voltage) {
2529 case MMC_SIGNAL_VOLTAGE_330:
2530 if (!(host->flags & SDHCI_SIGNALING_330))
2531 return -EINVAL;
2532 /* Set 1.8V Signal Enable in the Host Control2 register to 0 */
2533 ctrl &= ~SDHCI_CTRL_VDD_180;
2534 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2535
2536 if (!IS_ERR(mmc->supply.vqmmc)) {
2537 ret = mmc_regulator_set_vqmmc(mmc, ios);
2538 if (ret < 0) {
2539 pr_warn("%s: Switching to 3.3V signalling voltage failed\n",
2540 mmc_hostname(mmc));
2541 return -EIO;
2542 }
2543 }
2544 /* Wait for 5ms */
2545 usleep_range(5000, 5500);
2546
2547 /* 3.3V regulator output should be stable within 5 ms */
2548 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2549 if (!(ctrl & SDHCI_CTRL_VDD_180))
2550 return 0;
2551
2552 pr_warn("%s: 3.3V regulator output did not become stable\n",
2553 mmc_hostname(mmc));
2554
2555 return -EAGAIN;
2556 case MMC_SIGNAL_VOLTAGE_180:
2557 if (!(host->flags & SDHCI_SIGNALING_180))
2558 return -EINVAL;
2559 if (!IS_ERR(mmc->supply.vqmmc)) {
2560 ret = mmc_regulator_set_vqmmc(mmc, ios);
2561 if (ret < 0) {
2562 pr_warn("%s: Switching to 1.8V signalling voltage failed\n",
2563 mmc_hostname(mmc));
2564 return -EIO;
2565 }
2566 }
2567
2568 /*
2569 * Enable 1.8V Signal Enable in the Host Control2
2570 * register
2571 */
2572 ctrl |= SDHCI_CTRL_VDD_180;
2573 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2574
2575 /* Some controller need to do more when switching */
2576 if (host->ops->voltage_switch)
2577 host->ops->voltage_switch(host);
2578
2579 /* 1.8V regulator output should be stable within 5 ms */
2580 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2581 if (ctrl & SDHCI_CTRL_VDD_180)
2582 return 0;
2583
2584 pr_warn("%s: 1.8V regulator output did not become stable\n",
2585 mmc_hostname(mmc));
2586
2587 return -EAGAIN;
2588 case MMC_SIGNAL_VOLTAGE_120:
2589 if (!(host->flags & SDHCI_SIGNALING_120))
2590 return -EINVAL;
2591 if (!IS_ERR(mmc->supply.vqmmc)) {
2592 ret = mmc_regulator_set_vqmmc(mmc, ios);
2593 if (ret < 0) {
2594 pr_warn("%s: Switching to 1.2V signalling voltage failed\n",
2595 mmc_hostname(mmc));
2596 return -EIO;
2597 }
2598 }
2599 return 0;
2600 default:
2601 /* No signal voltage switch required */
2602 return 0;
2603 }
2604}
2605EXPORT_SYMBOL_GPL(sdhci_start_signal_voltage_switch);
2606
2607static int sdhci_card_busy(struct mmc_host *mmc)
2608{
2609 struct sdhci_host *host = mmc_priv(mmc);
2610 u32 present_state;
2611
2612 /* Check whether DAT[0] is 0 */
2613 present_state = sdhci_readl(host, SDHCI_PRESENT_STATE);
2614
2615 return !(present_state & SDHCI_DATA_0_LVL_MASK);
2616}
2617
2618static int sdhci_prepare_hs400_tuning(struct mmc_host *mmc, struct mmc_ios *ios)
2619{
2620 struct sdhci_host *host = mmc_priv(mmc);
2621 unsigned long flags;
2622
2623 spin_lock_irqsave(&host->lock, flags);
2624 host->flags |= SDHCI_HS400_TUNING;
2625 spin_unlock_irqrestore(&host->lock, flags);
2626
2627 return 0;
2628}
2629
2630void sdhci_start_tuning(struct sdhci_host *host)
2631{
2632 u16 ctrl;
2633
2634 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2635 ctrl |= SDHCI_CTRL_EXEC_TUNING;
2636 if (host->quirks2 & SDHCI_QUIRK2_TUNING_WORK_AROUND)
2637 ctrl |= SDHCI_CTRL_TUNED_CLK;
2638 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2639
2640 /*
2641 * As per the Host Controller spec v3.00, tuning command
2642 * generates Buffer Read Ready interrupt, so enable that.
2643 *
2644 * Note: The spec clearly says that when tuning sequence
2645 * is being performed, the controller does not generate
2646 * interrupts other than Buffer Read Ready interrupt. But
2647 * to make sure we don't hit a controller bug, we _only_
2648 * enable Buffer Read Ready interrupt here.
2649 */
2650 sdhci_writel(host, SDHCI_INT_DATA_AVAIL, SDHCI_INT_ENABLE);
2651 sdhci_writel(host, SDHCI_INT_DATA_AVAIL, SDHCI_SIGNAL_ENABLE);
2652}
2653EXPORT_SYMBOL_GPL(sdhci_start_tuning);
2654
2655void sdhci_end_tuning(struct sdhci_host *host)
2656{
2657 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
2658 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
2659}
2660EXPORT_SYMBOL_GPL(sdhci_end_tuning);
2661
2662void sdhci_reset_tuning(struct sdhci_host *host)
2663{
2664 u16 ctrl;
2665
2666 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2667 ctrl &= ~SDHCI_CTRL_TUNED_CLK;
2668 ctrl &= ~SDHCI_CTRL_EXEC_TUNING;
2669 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2670}
2671EXPORT_SYMBOL_GPL(sdhci_reset_tuning);
2672
2673void sdhci_abort_tuning(struct sdhci_host *host, u32 opcode)
2674{
2675 sdhci_reset_tuning(host);
2676
2677 sdhci_do_reset(host, SDHCI_RESET_CMD);
2678 sdhci_do_reset(host, SDHCI_RESET_DATA);
2679
2680 sdhci_end_tuning(host);
2681
2682 mmc_abort_tuning(host->mmc, opcode);
2683}
2684EXPORT_SYMBOL_GPL(sdhci_abort_tuning);
2685
2686/*
2687 * We use sdhci_send_tuning() because mmc_send_tuning() is not a good fit. SDHCI
2688 * tuning command does not have a data payload (or rather the hardware does it
2689 * automatically) so mmc_send_tuning() will return -EIO. Also the tuning command
2690 * interrupt setup is different to other commands and there is no timeout
2691 * interrupt so special handling is needed.
2692 */
2693void sdhci_send_tuning(struct sdhci_host *host, u32 opcode)
2694{
2695 struct mmc_host *mmc = host->mmc;
2696 struct mmc_command cmd = {};
2697 struct mmc_request mrq = {};
2698 unsigned long flags;
2699 u32 b = host->sdma_boundary;
2700
2701 spin_lock_irqsave(&host->lock, flags);
2702
2703 cmd.opcode = opcode;
2704 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
2705 cmd.mrq = &mrq;
2706
2707 mrq.cmd = &cmd;
2708 /*
2709 * In response to CMD19, the card sends 64 bytes of tuning
2710 * block to the Host Controller. So we set the block size
2711 * to 64 here.
2712 */
2713 if (cmd.opcode == MMC_SEND_TUNING_BLOCK_HS200 &&
2714 mmc->ios.bus_width == MMC_BUS_WIDTH_8)
2715 sdhci_writew(host, SDHCI_MAKE_BLKSZ(b, 128), SDHCI_BLOCK_SIZE);
2716 else
2717 sdhci_writew(host, SDHCI_MAKE_BLKSZ(b, 64), SDHCI_BLOCK_SIZE);
2718
2719 /*
2720 * The tuning block is sent by the card to the host controller.
2721 * So we set the TRNS_READ bit in the Transfer Mode register.
2722 * This also takes care of setting DMA Enable and Multi Block
2723 * Select in the same register to 0.
2724 */
2725 sdhci_writew(host, SDHCI_TRNS_READ, SDHCI_TRANSFER_MODE);
2726
2727 if (!sdhci_send_command_retry(host, &cmd, flags)) {
2728 spin_unlock_irqrestore(&host->lock, flags);
2729 host->tuning_done = 0;
2730 return;
2731 }
2732
2733 host->cmd = NULL;
2734
2735 sdhci_del_timer(host, &mrq);
2736
2737 host->tuning_done = 0;
2738
2739 spin_unlock_irqrestore(&host->lock, flags);
2740
2741 /* Wait for Buffer Read Ready interrupt */
2742 wait_event_timeout(host->buf_ready_int, (host->tuning_done == 1),
2743 msecs_to_jiffies(50));
2744
2745}
2746EXPORT_SYMBOL_GPL(sdhci_send_tuning);
2747
2748static int __sdhci_execute_tuning(struct sdhci_host *host, u32 opcode)
2749{
2750 int i;
2751
2752 /*
2753 * Issue opcode repeatedly till Execute Tuning is set to 0 or the number
2754 * of loops reaches tuning loop count.
2755 */
2756 for (i = 0; i < host->tuning_loop_count; i++) {
2757 u16 ctrl;
2758
2759 sdhci_send_tuning(host, opcode);
2760
2761 if (!host->tuning_done) {
2762 pr_debug("%s: Tuning timeout, falling back to fixed sampling clock\n",
2763 mmc_hostname(host->mmc));
2764 sdhci_abort_tuning(host, opcode);
2765 return -ETIMEDOUT;
2766 }
2767
2768 /* Spec does not require a delay between tuning cycles */
2769 if (host->tuning_delay > 0)
2770 mdelay(host->tuning_delay);
2771
2772 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2773 if (!(ctrl & SDHCI_CTRL_EXEC_TUNING)) {
2774 if (ctrl & SDHCI_CTRL_TUNED_CLK)
2775 return 0; /* Success! */
2776 break;
2777 }
2778
2779 }
2780
2781 pr_info("%s: Tuning failed, falling back to fixed sampling clock\n",
2782 mmc_hostname(host->mmc));
2783 sdhci_reset_tuning(host);
2784 return -EAGAIN;
2785}
2786
2787int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
2788{
2789 struct sdhci_host *host = mmc_priv(mmc);
2790 int err = 0;
2791 unsigned int tuning_count = 0;
2792 bool hs400_tuning;
2793
2794 hs400_tuning = host->flags & SDHCI_HS400_TUNING;
2795
2796 if (host->tuning_mode == SDHCI_TUNING_MODE_1)
2797 tuning_count = host->tuning_count;
2798
2799 /*
2800 * The Host Controller needs tuning in case of SDR104 and DDR50
2801 * mode, and for SDR50 mode when Use Tuning for SDR50 is set in
2802 * the Capabilities register.
2803 * If the Host Controller supports the HS200 mode then the
2804 * tuning function has to be executed.
2805 */
2806 switch (host->timing) {
2807 /* HS400 tuning is done in HS200 mode */
2808 case MMC_TIMING_MMC_HS400:
2809 err = -EINVAL;
2810 goto out;
2811
2812 case MMC_TIMING_MMC_HS200:
2813 /*
2814 * Periodic re-tuning for HS400 is not expected to be needed, so
2815 * disable it here.
2816 */
2817 if (hs400_tuning)
2818 tuning_count = 0;
2819 break;
2820
2821 case MMC_TIMING_UHS_SDR104:
2822 case MMC_TIMING_UHS_DDR50:
2823 break;
2824
2825 case MMC_TIMING_UHS_SDR50:
2826 if (host->flags & SDHCI_SDR50_NEEDS_TUNING)
2827 break;
2828 fallthrough;
2829
2830 default:
2831 goto out;
2832 }
2833
2834 if (host->ops->platform_execute_tuning) {
2835 err = host->ops->platform_execute_tuning(host, opcode);
2836 goto out;
2837 }
2838
2839 host->mmc->retune_period = tuning_count;
2840
2841 if (host->tuning_delay < 0)
2842 host->tuning_delay = opcode == MMC_SEND_TUNING_BLOCK;
2843
2844 sdhci_start_tuning(host);
2845
2846 host->tuning_err = __sdhci_execute_tuning(host, opcode);
2847
2848 sdhci_end_tuning(host);
2849out:
2850 host->flags &= ~SDHCI_HS400_TUNING;
2851
2852 return err;
2853}
2854EXPORT_SYMBOL_GPL(sdhci_execute_tuning);
2855
2856static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable)
2857{
2858 /* Host Controller v3.00 defines preset value registers */
2859 if (host->version < SDHCI_SPEC_300)
2860 return;
2861
2862 /*
2863 * We only enable or disable Preset Value if they are not already
2864 * enabled or disabled respectively. Otherwise, we bail out.
2865 */
2866 if (host->preset_enabled != enable) {
2867 u16 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2868
2869 if (enable)
2870 ctrl |= SDHCI_CTRL_PRESET_VAL_ENABLE;
2871 else
2872 ctrl &= ~SDHCI_CTRL_PRESET_VAL_ENABLE;
2873
2874 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2875
2876 if (enable)
2877 host->flags |= SDHCI_PV_ENABLED;
2878 else
2879 host->flags &= ~SDHCI_PV_ENABLED;
2880
2881 host->preset_enabled = enable;
2882 }
2883}
2884
2885static void sdhci_post_req(struct mmc_host *mmc, struct mmc_request *mrq,
2886 int err)
2887{
2888 struct sdhci_host *host = mmc_priv(mmc);
2889 struct mmc_data *data = mrq->data;
2890
2891 if (data->host_cookie != COOKIE_UNMAPPED)
2892 dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
2893 mmc_get_dma_dir(data));
2894
2895 data->host_cookie = COOKIE_UNMAPPED;
2896}
2897
2898static void sdhci_pre_req(struct mmc_host *mmc, struct mmc_request *mrq)
2899{
2900 struct sdhci_host *host = mmc_priv(mmc);
2901
2902 mrq->data->host_cookie = COOKIE_UNMAPPED;
2903
2904 /*
2905 * No pre-mapping in the pre hook if we're using the bounce buffer,
2906 * for that we would need two bounce buffers since one buffer is
2907 * in flight when this is getting called.
2908 */
2909 if (host->flags & SDHCI_REQ_USE_DMA && !host->bounce_buffer)
2910 sdhci_pre_dma_transfer(host, mrq->data, COOKIE_PRE_MAPPED);
2911}
2912
2913static void sdhci_error_out_mrqs(struct sdhci_host *host, int err)
2914{
2915 if (host->data_cmd) {
2916 host->data_cmd->error = err;
2917 sdhci_finish_mrq(host, host->data_cmd->mrq);
2918 }
2919
2920 if (host->cmd) {
2921 host->cmd->error = err;
2922 sdhci_finish_mrq(host, host->cmd->mrq);
2923 }
2924}
2925
2926static void sdhci_card_event(struct mmc_host *mmc)
2927{
2928 struct sdhci_host *host = mmc_priv(mmc);
2929 unsigned long flags;
2930 int present;
2931
2932 /* First check if client has provided their own card event */
2933 if (host->ops->card_event)
2934 host->ops->card_event(host);
2935
2936 present = mmc->ops->get_cd(mmc);
2937
2938 spin_lock_irqsave(&host->lock, flags);
2939
2940 /* Check sdhci_has_requests() first in case we are runtime suspended */
2941 if (sdhci_has_requests(host) && !present) {
2942 pr_err("%s: Card removed during transfer!\n",
2943 mmc_hostname(host->mmc));
2944 pr_err("%s: Resetting controller.\n",
2945 mmc_hostname(host->mmc));
2946
2947 sdhci_do_reset(host, SDHCI_RESET_CMD);
2948 sdhci_do_reset(host, SDHCI_RESET_DATA);
2949
2950 sdhci_error_out_mrqs(host, -ENOMEDIUM);
2951 }
2952
2953 spin_unlock_irqrestore(&host->lock, flags);
2954}
2955
2956static const struct mmc_host_ops sdhci_ops = {
2957 .request = sdhci_request,
2958 .post_req = sdhci_post_req,
2959 .pre_req = sdhci_pre_req,
2960 .set_ios = sdhci_set_ios,
2961 .get_cd = sdhci_get_cd,
2962 .get_ro = sdhci_get_ro,
2963 .hw_reset = sdhci_hw_reset,
2964 .enable_sdio_irq = sdhci_enable_sdio_irq,
2965 .ack_sdio_irq = sdhci_ack_sdio_irq,
2966 .start_signal_voltage_switch = sdhci_start_signal_voltage_switch,
2967 .prepare_hs400_tuning = sdhci_prepare_hs400_tuning,
2968 .execute_tuning = sdhci_execute_tuning,
2969 .card_event = sdhci_card_event,
2970 .card_busy = sdhci_card_busy,
2971};
2972
2973/*****************************************************************************\
2974 * *
2975 * Request done *
2976 * *
2977\*****************************************************************************/
2978
2979static bool sdhci_request_done(struct sdhci_host *host)
2980{
2981 unsigned long flags;
2982 struct mmc_request *mrq;
2983 int i;
2984
2985 spin_lock_irqsave(&host->lock, flags);
2986
2987 for (i = 0; i < SDHCI_MAX_MRQS; i++) {
2988 mrq = host->mrqs_done[i];
2989 if (mrq)
2990 break;
2991 }
2992
2993 if (!mrq) {
2994 spin_unlock_irqrestore(&host->lock, flags);
2995 return true;
2996 }
2997
2998 /*
2999 * Always unmap the data buffers if they were mapped by
3000 * sdhci_prepare_data() whenever we finish with a request.
3001 * This avoids leaking DMA mappings on error.
3002 */
3003 if (host->flags & SDHCI_REQ_USE_DMA) {
3004 struct mmc_data *data = mrq->data;
3005
3006 if (host->use_external_dma && data &&
3007 (mrq->cmd->error || data->error)) {
3008 struct dma_chan *chan = sdhci_external_dma_channel(host, data);
3009
3010 host->mrqs_done[i] = NULL;
3011 spin_unlock_irqrestore(&host->lock, flags);
3012 dmaengine_terminate_sync(chan);
3013 spin_lock_irqsave(&host->lock, flags);
3014 sdhci_set_mrq_done(host, mrq);
3015 }
3016
3017 if (data && data->host_cookie == COOKIE_MAPPED) {
3018 if (host->bounce_buffer) {
3019 /*
3020 * On reads, copy the bounced data into the
3021 * sglist
3022 */
3023 if (mmc_get_dma_dir(data) == DMA_FROM_DEVICE) {
3024 unsigned int length = data->bytes_xfered;
3025
3026 if (length > host->bounce_buffer_size) {
3027 pr_err("%s: bounce buffer is %u bytes but DMA claims to have transferred %u bytes\n",
3028 mmc_hostname(host->mmc),
3029 host->bounce_buffer_size,
3030 data->bytes_xfered);
3031 /* Cap it down and continue */
3032 length = host->bounce_buffer_size;
3033 }
3034 dma_sync_single_for_cpu(
3035 host->mmc->parent,
3036 host->bounce_addr,
3037 host->bounce_buffer_size,
3038 DMA_FROM_DEVICE);
3039 sg_copy_from_buffer(data->sg,
3040 data->sg_len,
3041 host->bounce_buffer,
3042 length);
3043 } else {
3044 /* No copying, just switch ownership */
3045 dma_sync_single_for_cpu(
3046 host->mmc->parent,
3047 host->bounce_addr,
3048 host->bounce_buffer_size,
3049 mmc_get_dma_dir(data));
3050 }
3051 } else {
3052 /* Unmap the raw data */
3053 dma_unmap_sg(mmc_dev(host->mmc), data->sg,
3054 data->sg_len,
3055 mmc_get_dma_dir(data));
3056 }
3057 data->host_cookie = COOKIE_UNMAPPED;
3058 }
3059 }
3060
3061 /*
3062 * The controller needs a reset of internal state machines
3063 * upon error conditions.
3064 */
3065 if (sdhci_needs_reset(host, mrq)) {
3066 /*
3067 * Do not finish until command and data lines are available for
3068 * reset. Note there can only be one other mrq, so it cannot
3069 * also be in mrqs_done, otherwise host->cmd and host->data_cmd
3070 * would both be null.
3071 */
3072 if (host->cmd || host->data_cmd) {
3073 spin_unlock_irqrestore(&host->lock, flags);
3074 return true;
3075 }
3076
3077 /* Some controllers need this kick or reset won't work here */
3078 if (host->quirks & SDHCI_QUIRK_CLOCK_BEFORE_RESET)
3079 /* This is to force an update */
3080 host->ops->set_clock(host, host->clock);
3081
3082 /* Spec says we should do both at the same time, but Ricoh
3083 controllers do not like that. */
3084 sdhci_do_reset(host, SDHCI_RESET_CMD);
3085 sdhci_do_reset(host, SDHCI_RESET_DATA);
3086
3087 host->pending_reset = false;
3088 }
3089
3090 host->mrqs_done[i] = NULL;
3091
3092 spin_unlock_irqrestore(&host->lock, flags);
3093
3094 if (host->ops->request_done)
3095 host->ops->request_done(host, mrq);
3096 else
3097 mmc_request_done(host->mmc, mrq);
3098
3099 return false;
3100}
3101
3102static void sdhci_complete_work(struct work_struct *work)
3103{
3104 struct sdhci_host *host = container_of(work, struct sdhci_host,
3105 complete_work);
3106
3107 while (!sdhci_request_done(host))
3108 ;
3109}
3110
3111static void sdhci_timeout_timer(struct timer_list *t)
3112{
3113 struct sdhci_host *host;
3114 unsigned long flags;
3115
3116 host = from_timer(host, t, timer);
3117
3118 spin_lock_irqsave(&host->lock, flags);
3119
3120 if (host->cmd && !sdhci_data_line_cmd(host->cmd)) {
3121 pr_err("%s: Timeout waiting for hardware cmd interrupt.\n",
3122 mmc_hostname(host->mmc));
3123 sdhci_dumpregs(host);
3124
3125 host->cmd->error = -ETIMEDOUT;
3126 sdhci_finish_mrq(host, host->cmd->mrq);
3127 }
3128
3129 spin_unlock_irqrestore(&host->lock, flags);
3130}
3131
3132static void sdhci_timeout_data_timer(struct timer_list *t)
3133{
3134 struct sdhci_host *host;
3135 unsigned long flags;
3136
3137 host = from_timer(host, t, data_timer);
3138
3139 spin_lock_irqsave(&host->lock, flags);
3140
3141 if (host->data || host->data_cmd ||
3142 (host->cmd && sdhci_data_line_cmd(host->cmd))) {
3143 pr_err("%s: Timeout waiting for hardware interrupt.\n",
3144 mmc_hostname(host->mmc));
3145 sdhci_dumpregs(host);
3146
3147 if (host->data) {
3148 host->data->error = -ETIMEDOUT;
3149 __sdhci_finish_data(host, true);
3150 queue_work(host->complete_wq, &host->complete_work);
3151 } else if (host->data_cmd) {
3152 host->data_cmd->error = -ETIMEDOUT;
3153 sdhci_finish_mrq(host, host->data_cmd->mrq);
3154 } else {
3155 host->cmd->error = -ETIMEDOUT;
3156 sdhci_finish_mrq(host, host->cmd->mrq);
3157 }
3158 }
3159
3160 spin_unlock_irqrestore(&host->lock, flags);
3161}
3162
3163/*****************************************************************************\
3164 * *
3165 * Interrupt handling *
3166 * *
3167\*****************************************************************************/
3168
3169static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask, u32 *intmask_p)
3170{
3171 /* Handle auto-CMD12 error */
3172 if (intmask & SDHCI_INT_AUTO_CMD_ERR && host->data_cmd) {
3173 struct mmc_request *mrq = host->data_cmd->mrq;
3174 u16 auto_cmd_status = sdhci_readw(host, SDHCI_AUTO_CMD_STATUS);
3175 int data_err_bit = (auto_cmd_status & SDHCI_AUTO_CMD_TIMEOUT) ?
3176 SDHCI_INT_DATA_TIMEOUT :
3177 SDHCI_INT_DATA_CRC;
3178
3179 /* Treat auto-CMD12 error the same as data error */
3180 if (!mrq->sbc && (host->flags & SDHCI_AUTO_CMD12)) {
3181 *intmask_p |= data_err_bit;
3182 return;
3183 }
3184 }
3185
3186 if (!host->cmd) {
3187 /*
3188 * SDHCI recovers from errors by resetting the cmd and data
3189 * circuits. Until that is done, there very well might be more
3190 * interrupts, so ignore them in that case.
3191 */
3192 if (host->pending_reset)
3193 return;
3194 pr_err("%s: Got command interrupt 0x%08x even though no command operation was in progress.\n",
3195 mmc_hostname(host->mmc), (unsigned)intmask);
3196 sdhci_dumpregs(host);
3197 return;
3198 }
3199
3200 if (intmask & (SDHCI_INT_TIMEOUT | SDHCI_INT_CRC |
3201 SDHCI_INT_END_BIT | SDHCI_INT_INDEX)) {
3202 if (intmask & SDHCI_INT_TIMEOUT)
3203 host->cmd->error = -ETIMEDOUT;
3204 else
3205 host->cmd->error = -EILSEQ;
3206
3207 /* Treat data command CRC error the same as data CRC error */
3208 if (host->cmd->data &&
3209 (intmask & (SDHCI_INT_CRC | SDHCI_INT_TIMEOUT)) ==
3210 SDHCI_INT_CRC) {
3211 host->cmd = NULL;
3212 *intmask_p |= SDHCI_INT_DATA_CRC;
3213 return;
3214 }
3215
3216 __sdhci_finish_mrq(host, host->cmd->mrq);
3217 return;
3218 }
3219
3220 /* Handle auto-CMD23 error */
3221 if (intmask & SDHCI_INT_AUTO_CMD_ERR) {
3222 struct mmc_request *mrq = host->cmd->mrq;
3223 u16 auto_cmd_status = sdhci_readw(host, SDHCI_AUTO_CMD_STATUS);
3224 int err = (auto_cmd_status & SDHCI_AUTO_CMD_TIMEOUT) ?
3225 -ETIMEDOUT :
3226 -EILSEQ;
3227
3228 if (mrq->sbc && (host->flags & SDHCI_AUTO_CMD23)) {
3229 mrq->sbc->error = err;
3230 __sdhci_finish_mrq(host, mrq);
3231 return;
3232 }
3233 }
3234
3235 if (intmask & SDHCI_INT_RESPONSE)
3236 sdhci_finish_command(host);
3237}
3238
3239static void sdhci_adma_show_error(struct sdhci_host *host)
3240{
3241 void *desc = host->adma_table;
3242 dma_addr_t dma = host->adma_addr;
3243
3244 sdhci_dumpregs(host);
3245
3246 while (true) {
3247 struct sdhci_adma2_64_desc *dma_desc = desc;
3248
3249 if (host->flags & SDHCI_USE_64_BIT_DMA)
3250 SDHCI_DUMP("%08llx: DMA 0x%08x%08x, LEN 0x%04x, Attr=0x%02x\n",
3251 (unsigned long long)dma,
3252 le32_to_cpu(dma_desc->addr_hi),
3253 le32_to_cpu(dma_desc->addr_lo),
3254 le16_to_cpu(dma_desc->len),
3255 le16_to_cpu(dma_desc->cmd));
3256 else
3257 SDHCI_DUMP("%08llx: DMA 0x%08x, LEN 0x%04x, Attr=0x%02x\n",
3258 (unsigned long long)dma,
3259 le32_to_cpu(dma_desc->addr_lo),
3260 le16_to_cpu(dma_desc->len),
3261 le16_to_cpu(dma_desc->cmd));
3262
3263 desc += host->desc_sz;
3264 dma += host->desc_sz;
3265
3266 if (dma_desc->cmd & cpu_to_le16(ADMA2_END))
3267 break;
3268 }
3269}
3270
3271static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
3272{
3273 u32 command;
3274
3275 /* CMD19 generates _only_ Buffer Read Ready interrupt */
3276 if (intmask & SDHCI_INT_DATA_AVAIL) {
3277 command = SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND));
3278 if (command == MMC_SEND_TUNING_BLOCK ||
3279 command == MMC_SEND_TUNING_BLOCK_HS200) {
3280 host->tuning_done = 1;
3281 wake_up(&host->buf_ready_int);
3282 return;
3283 }
3284 }
3285
3286 if (!host->data) {
3287 struct mmc_command *data_cmd = host->data_cmd;
3288
3289 /*
3290 * The "data complete" interrupt is also used to
3291 * indicate that a busy state has ended. See comment
3292 * above in sdhci_cmd_irq().
3293 */
3294 if (data_cmd && (data_cmd->flags & MMC_RSP_BUSY)) {
3295 if (intmask & SDHCI_INT_DATA_TIMEOUT) {
3296 host->data_cmd = NULL;
3297 data_cmd->error = -ETIMEDOUT;
3298 __sdhci_finish_mrq(host, data_cmd->mrq);
3299 return;
3300 }
3301 if (intmask & SDHCI_INT_DATA_END) {
3302 host->data_cmd = NULL;
3303 /*
3304 * Some cards handle busy-end interrupt
3305 * before the command completed, so make
3306 * sure we do things in the proper order.
3307 */
3308 if (host->cmd == data_cmd)
3309 return;
3310
3311 __sdhci_finish_mrq(host, data_cmd->mrq);
3312 return;
3313 }
3314 }
3315
3316 /*
3317 * SDHCI recovers from errors by resetting the cmd and data
3318 * circuits. Until that is done, there very well might be more
3319 * interrupts, so ignore them in that case.
3320 */
3321 if (host->pending_reset)
3322 return;
3323
3324 pr_err("%s: Got data interrupt 0x%08x even though no data operation was in progress.\n",
3325 mmc_hostname(host->mmc), (unsigned)intmask);
3326 sdhci_dumpregs(host);
3327
3328 return;
3329 }
3330
3331 if (intmask & SDHCI_INT_DATA_TIMEOUT)
3332 host->data->error = -ETIMEDOUT;
3333 else if (intmask & SDHCI_INT_DATA_END_BIT)
3334 host->data->error = -EILSEQ;
3335 else if ((intmask & SDHCI_INT_DATA_CRC) &&
3336 SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND))
3337 != MMC_BUS_TEST_R)
3338 host->data->error = -EILSEQ;
3339 else if (intmask & SDHCI_INT_ADMA_ERROR) {
3340 pr_err("%s: ADMA error: 0x%08x\n", mmc_hostname(host->mmc),
3341 intmask);
3342 sdhci_adma_show_error(host);
3343 host->data->error = -EIO;
3344 if (host->ops->adma_workaround)
3345 host->ops->adma_workaround(host, intmask);
3346 }
3347
3348 if (host->data->error)
3349 sdhci_finish_data(host);
3350 else {
3351 if (intmask & (SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL))
3352 sdhci_transfer_pio(host);
3353
3354 /*
3355 * We currently don't do anything fancy with DMA
3356 * boundaries, but as we can't disable the feature
3357 * we need to at least restart the transfer.
3358 *
3359 * According to the spec sdhci_readl(host, SDHCI_DMA_ADDRESS)
3360 * should return a valid address to continue from, but as
3361 * some controllers are faulty, don't trust them.
3362 */
3363 if (intmask & SDHCI_INT_DMA_END) {
3364 dma_addr_t dmastart, dmanow;
3365
3366 dmastart = sdhci_sdma_address(host);
3367 dmanow = dmastart + host->data->bytes_xfered;
3368 /*
3369 * Force update to the next DMA block boundary.
3370 */
3371 dmanow = (dmanow &
3372 ~((dma_addr_t)SDHCI_DEFAULT_BOUNDARY_SIZE - 1)) +
3373 SDHCI_DEFAULT_BOUNDARY_SIZE;
3374 host->data->bytes_xfered = dmanow - dmastart;
3375 DBG("DMA base %pad, transferred 0x%06x bytes, next %pad\n",
3376 &dmastart, host->data->bytes_xfered, &dmanow);
3377 sdhci_set_sdma_addr(host, dmanow);
3378 }
3379
3380 if (intmask & SDHCI_INT_DATA_END) {
3381 if (host->cmd == host->data_cmd) {
3382 /*
3383 * Data managed to finish before the
3384 * command completed. Make sure we do
3385 * things in the proper order.
3386 */
3387 host->data_early = 1;
3388 } else {
3389 sdhci_finish_data(host);
3390 }
3391 }
3392 }
3393}
3394
3395static inline bool sdhci_defer_done(struct sdhci_host *host,
3396 struct mmc_request *mrq)
3397{
3398 struct mmc_data *data = mrq->data;
3399
3400 return host->pending_reset || host->always_defer_done ||
3401 ((host->flags & SDHCI_REQ_USE_DMA) && data &&
3402 data->host_cookie == COOKIE_MAPPED);
3403}
3404
3405static irqreturn_t sdhci_irq(int irq, void *dev_id)
3406{
3407 struct mmc_request *mrqs_done[SDHCI_MAX_MRQS] = {0};
3408 irqreturn_t result = IRQ_NONE;
3409 struct sdhci_host *host = dev_id;
3410 u32 intmask, mask, unexpected = 0;
3411 int max_loops = 16;
3412 int i;
3413
3414 spin_lock(&host->lock);
3415
3416 if (host->runtime_suspended) {
3417 spin_unlock(&host->lock);
3418 return IRQ_NONE;
3419 }
3420
3421 intmask = sdhci_readl(host, SDHCI_INT_STATUS);
3422 if (!intmask || intmask == 0xffffffff) {
3423 result = IRQ_NONE;
3424 goto out;
3425 }
3426
3427 do {
3428 DBG("IRQ status 0x%08x\n", intmask);
3429
3430 if (host->ops->irq) {
3431 intmask = host->ops->irq(host, intmask);
3432 if (!intmask)
3433 goto cont;
3434 }
3435
3436 /* Clear selected interrupts. */
3437 mask = intmask & (SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK |
3438 SDHCI_INT_BUS_POWER);
3439 sdhci_writel(host, mask, SDHCI_INT_STATUS);
3440
3441 if (intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
3442 u32 present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
3443 SDHCI_CARD_PRESENT;
3444
3445 /*
3446 * There is a observation on i.mx esdhc. INSERT
3447 * bit will be immediately set again when it gets
3448 * cleared, if a card is inserted. We have to mask
3449 * the irq to prevent interrupt storm which will
3450 * freeze the system. And the REMOVE gets the
3451 * same situation.
3452 *
3453 * More testing are needed here to ensure it works
3454 * for other platforms though.
3455 */
3456 host->ier &= ~(SDHCI_INT_CARD_INSERT |
3457 SDHCI_INT_CARD_REMOVE);
3458 host->ier |= present ? SDHCI_INT_CARD_REMOVE :
3459 SDHCI_INT_CARD_INSERT;
3460 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
3461 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
3462
3463 sdhci_writel(host, intmask & (SDHCI_INT_CARD_INSERT |
3464 SDHCI_INT_CARD_REMOVE), SDHCI_INT_STATUS);
3465
3466 host->thread_isr |= intmask & (SDHCI_INT_CARD_INSERT |
3467 SDHCI_INT_CARD_REMOVE);
3468 result = IRQ_WAKE_THREAD;
3469 }
3470
3471 if (intmask & SDHCI_INT_CMD_MASK)
3472 sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK, &intmask);
3473
3474 if (intmask & SDHCI_INT_DATA_MASK)
3475 sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK);
3476
3477 if (intmask & SDHCI_INT_BUS_POWER)
3478 pr_err("%s: Card is consuming too much power!\n",
3479 mmc_hostname(host->mmc));
3480
3481 if (intmask & SDHCI_INT_RETUNE)
3482 mmc_retune_needed(host->mmc);
3483
3484 if ((intmask & SDHCI_INT_CARD_INT) &&
3485 (host->ier & SDHCI_INT_CARD_INT)) {
3486 sdhci_enable_sdio_irq_nolock(host, false);
3487 sdio_signal_irq(host->mmc);
3488 }
3489
3490 intmask &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE |
3491 SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK |
3492 SDHCI_INT_ERROR | SDHCI_INT_BUS_POWER |
3493 SDHCI_INT_RETUNE | SDHCI_INT_CARD_INT);
3494
3495 if (intmask) {
3496 unexpected |= intmask;
3497 sdhci_writel(host, intmask, SDHCI_INT_STATUS);
3498 }
3499cont:
3500 if (result == IRQ_NONE)
3501 result = IRQ_HANDLED;
3502
3503 intmask = sdhci_readl(host, SDHCI_INT_STATUS);
3504 } while (intmask && --max_loops);
3505
3506 /* Determine if mrqs can be completed immediately */
3507 for (i = 0; i < SDHCI_MAX_MRQS; i++) {
3508 struct mmc_request *mrq = host->mrqs_done[i];
3509
3510 if (!mrq)
3511 continue;
3512
3513 if (sdhci_defer_done(host, mrq)) {
3514 result = IRQ_WAKE_THREAD;
3515 } else {
3516 mrqs_done[i] = mrq;
3517 host->mrqs_done[i] = NULL;
3518 }
3519 }
3520out:
3521 if (host->deferred_cmd)
3522 result = IRQ_WAKE_THREAD;
3523
3524 spin_unlock(&host->lock);
3525
3526 /* Process mrqs ready for immediate completion */
3527 for (i = 0; i < SDHCI_MAX_MRQS; i++) {
3528 if (!mrqs_done[i])
3529 continue;
3530
3531 if (host->ops->request_done)
3532 host->ops->request_done(host, mrqs_done[i]);
3533 else
3534 mmc_request_done(host->mmc, mrqs_done[i]);
3535 }
3536
3537 if (unexpected) {
3538 pr_err("%s: Unexpected interrupt 0x%08x.\n",
3539 mmc_hostname(host->mmc), unexpected);
3540 sdhci_dumpregs(host);
3541 }
3542
3543 return result;
3544}
3545
3546static irqreturn_t sdhci_thread_irq(int irq, void *dev_id)
3547{
3548 struct sdhci_host *host = dev_id;
3549 struct mmc_command *cmd;
3550 unsigned long flags;
3551 u32 isr;
3552
3553 while (!sdhci_request_done(host))
3554 ;
3555
3556 spin_lock_irqsave(&host->lock, flags);
3557
3558 isr = host->thread_isr;
3559 host->thread_isr = 0;
3560
3561 cmd = host->deferred_cmd;
3562 if (cmd && !sdhci_send_command_retry(host, cmd, flags))
3563 sdhci_finish_mrq(host, cmd->mrq);
3564
3565 spin_unlock_irqrestore(&host->lock, flags);
3566
3567 if (isr & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
3568 struct mmc_host *mmc = host->mmc;
3569
3570 mmc->ops->card_event(mmc);
3571 mmc_detect_change(mmc, msecs_to_jiffies(200));
3572 }
3573
3574 return IRQ_HANDLED;
3575}
3576
3577/*****************************************************************************\
3578 * *
3579 * Suspend/resume *
3580 * *
3581\*****************************************************************************/
3582
3583#ifdef CONFIG_PM
3584
3585static bool sdhci_cd_irq_can_wakeup(struct sdhci_host *host)
3586{
3587 return mmc_card_is_removable(host->mmc) &&
3588 !(host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) &&
3589 !mmc_can_gpio_cd(host->mmc);
3590}
3591
3592/*
3593 * To enable wakeup events, the corresponding events have to be enabled in
3594 * the Interrupt Status Enable register too. See 'Table 1-6: Wakeup Signal
3595 * Table' in the SD Host Controller Standard Specification.
3596 * It is useless to restore SDHCI_INT_ENABLE state in
3597 * sdhci_disable_irq_wakeups() since it will be set by
3598 * sdhci_enable_card_detection() or sdhci_init().
3599 */
3600static bool sdhci_enable_irq_wakeups(struct sdhci_host *host)
3601{
3602 u8 mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE |
3603 SDHCI_WAKE_ON_INT;
3604 u32 irq_val = 0;
3605 u8 wake_val = 0;
3606 u8 val;
3607
3608 if (sdhci_cd_irq_can_wakeup(host)) {
3609 wake_val |= SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE;
3610 irq_val |= SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE;
3611 }
3612
3613 if (mmc_card_wake_sdio_irq(host->mmc)) {
3614 wake_val |= SDHCI_WAKE_ON_INT;
3615 irq_val |= SDHCI_INT_CARD_INT;
3616 }
3617
3618 if (!irq_val)
3619 return false;
3620
3621 val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
3622 val &= ~mask;
3623 val |= wake_val;
3624 sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
3625
3626 sdhci_writel(host, irq_val, SDHCI_INT_ENABLE);
3627
3628 host->irq_wake_enabled = !enable_irq_wake(host->irq);
3629
3630 return host->irq_wake_enabled;
3631}
3632
3633static void sdhci_disable_irq_wakeups(struct sdhci_host *host)
3634{
3635 u8 val;
3636 u8 mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE
3637 | SDHCI_WAKE_ON_INT;
3638
3639 val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
3640 val &= ~mask;
3641 sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
3642
3643 disable_irq_wake(host->irq);
3644
3645 host->irq_wake_enabled = false;
3646}
3647
3648int sdhci_suspend_host(struct sdhci_host *host)
3649{
3650 sdhci_disable_card_detection(host);
3651
3652 mmc_retune_timer_stop(host->mmc);
3653
3654 if (!device_may_wakeup(mmc_dev(host->mmc)) ||
3655 !sdhci_enable_irq_wakeups(host)) {
3656 host->ier = 0;
3657 sdhci_writel(host, 0, SDHCI_INT_ENABLE);
3658 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
3659 free_irq(host->irq, host);
3660 }
3661
3662 return 0;
3663}
3664
3665EXPORT_SYMBOL_GPL(sdhci_suspend_host);
3666
3667int sdhci_resume_host(struct sdhci_host *host)
3668{
3669 struct mmc_host *mmc = host->mmc;
3670 int ret = 0;
3671
3672 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
3673 if (host->ops->enable_dma)
3674 host->ops->enable_dma(host);
3675 }
3676
3677 if ((host->mmc->pm_flags & MMC_PM_KEEP_POWER) &&
3678 (host->quirks2 & SDHCI_QUIRK2_HOST_OFF_CARD_ON)) {
3679 /* Card keeps power but host controller does not */
3680 sdhci_init(host, 0);
3681 host->pwr = 0;
3682 host->clock = 0;
3683 mmc->ops->set_ios(mmc, &mmc->ios);
3684 } else {
3685 sdhci_init(host, (host->mmc->pm_flags & MMC_PM_KEEP_POWER));
3686 }
3687
3688 if (host->irq_wake_enabled) {
3689 sdhci_disable_irq_wakeups(host);
3690 } else {
3691 ret = request_threaded_irq(host->irq, sdhci_irq,
3692 sdhci_thread_irq, IRQF_SHARED,
3693 mmc_hostname(host->mmc), host);
3694 if (ret)
3695 return ret;
3696 }
3697
3698 sdhci_enable_card_detection(host);
3699
3700 return ret;
3701}
3702
3703EXPORT_SYMBOL_GPL(sdhci_resume_host);
3704
3705int sdhci_runtime_suspend_host(struct sdhci_host *host)
3706{
3707 unsigned long flags;
3708
3709 mmc_retune_timer_stop(host->mmc);
3710
3711 spin_lock_irqsave(&host->lock, flags);
3712 host->ier &= SDHCI_INT_CARD_INT;
3713 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
3714 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
3715 spin_unlock_irqrestore(&host->lock, flags);
3716
3717 synchronize_hardirq(host->irq);
3718
3719 spin_lock_irqsave(&host->lock, flags);
3720 host->runtime_suspended = true;
3721 spin_unlock_irqrestore(&host->lock, flags);
3722
3723 return 0;
3724}
3725EXPORT_SYMBOL_GPL(sdhci_runtime_suspend_host);
3726
3727int sdhci_runtime_resume_host(struct sdhci_host *host, int soft_reset)
3728{
3729 struct mmc_host *mmc = host->mmc;
3730 unsigned long flags;
3731 int host_flags = host->flags;
3732
3733 if (host_flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
3734 if (host->ops->enable_dma)
3735 host->ops->enable_dma(host);
3736 }
3737
3738 sdhci_init(host, soft_reset);
3739
3740 if (mmc->ios.power_mode != MMC_POWER_UNDEFINED &&
3741 mmc->ios.power_mode != MMC_POWER_OFF) {
3742 /* Force clock and power re-program */
3743 host->pwr = 0;
3744 host->clock = 0;
3745 mmc->ops->start_signal_voltage_switch(mmc, &mmc->ios);
3746 mmc->ops->set_ios(mmc, &mmc->ios);
3747
3748 if ((host_flags & SDHCI_PV_ENABLED) &&
3749 !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN)) {
3750 spin_lock_irqsave(&host->lock, flags);
3751 sdhci_enable_preset_value(host, true);
3752 spin_unlock_irqrestore(&host->lock, flags);
3753 }
3754
3755 if ((mmc->caps2 & MMC_CAP2_HS400_ES) &&
3756 mmc->ops->hs400_enhanced_strobe)
3757 mmc->ops->hs400_enhanced_strobe(mmc, &mmc->ios);
3758 }
3759
3760 spin_lock_irqsave(&host->lock, flags);
3761
3762 host->runtime_suspended = false;
3763
3764 /* Enable SDIO IRQ */
3765 if (sdio_irq_claimed(mmc))
3766 sdhci_enable_sdio_irq_nolock(host, true);
3767
3768 /* Enable Card Detection */
3769 sdhci_enable_card_detection(host);
3770
3771 spin_unlock_irqrestore(&host->lock, flags);
3772
3773 return 0;
3774}
3775EXPORT_SYMBOL_GPL(sdhci_runtime_resume_host);
3776
3777#endif /* CONFIG_PM */
3778
3779/*****************************************************************************\
3780 * *
3781 * Command Queue Engine (CQE) helpers *
3782 * *
3783\*****************************************************************************/
3784
3785void sdhci_cqe_enable(struct mmc_host *mmc)
3786{
3787 struct sdhci_host *host = mmc_priv(mmc);
3788 unsigned long flags;
3789 u8 ctrl;
3790
3791 spin_lock_irqsave(&host->lock, flags);
3792
3793 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
3794 ctrl &= ~SDHCI_CTRL_DMA_MASK;
3795 /*
3796 * Host from V4.10 supports ADMA3 DMA type.
3797 * ADMA3 performs integrated descriptor which is more suitable
3798 * for cmd queuing to fetch both command and transfer descriptors.
3799 */
3800 if (host->v4_mode && (host->caps1 & SDHCI_CAN_DO_ADMA3))
3801 ctrl |= SDHCI_CTRL_ADMA3;
3802 else if (host->flags & SDHCI_USE_64_BIT_DMA)
3803 ctrl |= SDHCI_CTRL_ADMA64;
3804 else
3805 ctrl |= SDHCI_CTRL_ADMA32;
3806 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
3807
3808 sdhci_writew(host, SDHCI_MAKE_BLKSZ(host->sdma_boundary, 512),
3809 SDHCI_BLOCK_SIZE);
3810
3811 /* Set maximum timeout */
3812 sdhci_set_timeout(host, NULL);
3813
3814 host->ier = host->cqe_ier;
3815
3816 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
3817 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
3818
3819 host->cqe_on = true;
3820
3821 pr_debug("%s: sdhci: CQE on, IRQ mask %#x, IRQ status %#x\n",
3822 mmc_hostname(mmc), host->ier,
3823 sdhci_readl(host, SDHCI_INT_STATUS));
3824
3825 spin_unlock_irqrestore(&host->lock, flags);
3826}
3827EXPORT_SYMBOL_GPL(sdhci_cqe_enable);
3828
3829void sdhci_cqe_disable(struct mmc_host *mmc, bool recovery)
3830{
3831 struct sdhci_host *host = mmc_priv(mmc);
3832 unsigned long flags;
3833
3834 spin_lock_irqsave(&host->lock, flags);
3835
3836 sdhci_set_default_irqs(host);
3837
3838 host->cqe_on = false;
3839
3840 if (recovery) {
3841 sdhci_do_reset(host, SDHCI_RESET_CMD);
3842 sdhci_do_reset(host, SDHCI_RESET_DATA);
3843 }
3844
3845 pr_debug("%s: sdhci: CQE off, IRQ mask %#x, IRQ status %#x\n",
3846 mmc_hostname(mmc), host->ier,
3847 sdhci_readl(host, SDHCI_INT_STATUS));
3848
3849 spin_unlock_irqrestore(&host->lock, flags);
3850}
3851EXPORT_SYMBOL_GPL(sdhci_cqe_disable);
3852
3853bool sdhci_cqe_irq(struct sdhci_host *host, u32 intmask, int *cmd_error,
3854 int *data_error)
3855{
3856 u32 mask;
3857
3858 if (!host->cqe_on)
3859 return false;
3860
3861 if (intmask & (SDHCI_INT_INDEX | SDHCI_INT_END_BIT | SDHCI_INT_CRC))
3862 *cmd_error = -EILSEQ;
3863 else if (intmask & SDHCI_INT_TIMEOUT)
3864 *cmd_error = -ETIMEDOUT;
3865 else
3866 *cmd_error = 0;
3867
3868 if (intmask & (SDHCI_INT_DATA_END_BIT | SDHCI_INT_DATA_CRC))
3869 *data_error = -EILSEQ;
3870 else if (intmask & SDHCI_INT_DATA_TIMEOUT)
3871 *data_error = -ETIMEDOUT;
3872 else if (intmask & SDHCI_INT_ADMA_ERROR)
3873 *data_error = -EIO;
3874 else
3875 *data_error = 0;
3876
3877 /* Clear selected interrupts. */
3878 mask = intmask & host->cqe_ier;
3879 sdhci_writel(host, mask, SDHCI_INT_STATUS);
3880
3881 if (intmask & SDHCI_INT_BUS_POWER)
3882 pr_err("%s: Card is consuming too much power!\n",
3883 mmc_hostname(host->mmc));
3884
3885 intmask &= ~(host->cqe_ier | SDHCI_INT_ERROR);
3886 if (intmask) {
3887 sdhci_writel(host, intmask, SDHCI_INT_STATUS);
3888 pr_err("%s: CQE: Unexpected interrupt 0x%08x.\n",
3889 mmc_hostname(host->mmc), intmask);
3890 sdhci_dumpregs(host);
3891 }
3892
3893 return true;
3894}
3895EXPORT_SYMBOL_GPL(sdhci_cqe_irq);
3896
3897/*****************************************************************************\
3898 * *
3899 * Device allocation/registration *
3900 * *
3901\*****************************************************************************/
3902
3903struct sdhci_host *sdhci_alloc_host(struct device *dev,
3904 size_t priv_size)
3905{
3906 struct mmc_host *mmc;
3907 struct sdhci_host *host;
3908
3909 WARN_ON(dev == NULL);
3910
3911 mmc = mmc_alloc_host(sizeof(struct sdhci_host) + priv_size, dev);
3912 if (!mmc)
3913 return ERR_PTR(-ENOMEM);
3914
3915 host = mmc_priv(mmc);
3916 host->mmc = mmc;
3917 host->mmc_host_ops = sdhci_ops;
3918 mmc->ops = &host->mmc_host_ops;
3919
3920 host->flags = SDHCI_SIGNALING_330;
3921
3922 host->cqe_ier = SDHCI_CQE_INT_MASK;
3923 host->cqe_err_ier = SDHCI_CQE_INT_ERR_MASK;
3924
3925 host->tuning_delay = -1;
3926 host->tuning_loop_count = MAX_TUNING_LOOP;
3927
3928 host->sdma_boundary = SDHCI_DEFAULT_BOUNDARY_ARG;
3929
3930 /*
3931 * The DMA table descriptor count is calculated as the maximum
3932 * number of segments times 2, to allow for an alignment
3933 * descriptor for each segment, plus 1 for a nop end descriptor.
3934 */
3935 host->adma_table_cnt = SDHCI_MAX_SEGS * 2 + 1;
3936
3937 return host;
3938}
3939
3940EXPORT_SYMBOL_GPL(sdhci_alloc_host);
3941
3942static int sdhci_set_dma_mask(struct sdhci_host *host)
3943{
3944 struct mmc_host *mmc = host->mmc;
3945 struct device *dev = mmc_dev(mmc);
3946 int ret = -EINVAL;
3947
3948 if (host->quirks2 & SDHCI_QUIRK2_BROKEN_64_BIT_DMA)
3949 host->flags &= ~SDHCI_USE_64_BIT_DMA;
3950
3951 /* Try 64-bit mask if hardware is capable of it */
3952 if (host->flags & SDHCI_USE_64_BIT_DMA) {
3953 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
3954 if (ret) {
3955 pr_warn("%s: Failed to set 64-bit DMA mask.\n",
3956 mmc_hostname(mmc));
3957 host->flags &= ~SDHCI_USE_64_BIT_DMA;
3958 }
3959 }
3960
3961 /* 32-bit mask as default & fallback */
3962 if (ret) {
3963 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
3964 if (ret)
3965 pr_warn("%s: Failed to set 32-bit DMA mask.\n",
3966 mmc_hostname(mmc));
3967 }
3968
3969 return ret;
3970}
3971
3972void __sdhci_read_caps(struct sdhci_host *host, const u16 *ver,
3973 const u32 *caps, const u32 *caps1)
3974{
3975 u16 v;
3976 u64 dt_caps_mask = 0;
3977 u64 dt_caps = 0;
3978
3979 if (host->read_caps)
3980 return;
3981
3982 host->read_caps = true;
3983
3984 if (debug_quirks)
3985 host->quirks = debug_quirks;
3986
3987 if (debug_quirks2)
3988 host->quirks2 = debug_quirks2;
3989
3990 sdhci_do_reset(host, SDHCI_RESET_ALL);
3991
3992 if (host->v4_mode)
3993 sdhci_do_enable_v4_mode(host);
3994
3995 of_property_read_u64(mmc_dev(host->mmc)->of_node,
3996 "sdhci-caps-mask", &dt_caps_mask);
3997 of_property_read_u64(mmc_dev(host->mmc)->of_node,
3998 "sdhci-caps", &dt_caps);
3999
4000 v = ver ? *ver : sdhci_readw(host, SDHCI_HOST_VERSION);
4001 host->version = (v & SDHCI_SPEC_VER_MASK) >> SDHCI_SPEC_VER_SHIFT;
4002
4003 if (host->quirks & SDHCI_QUIRK_MISSING_CAPS)
4004 return;
4005
4006 if (caps) {
4007 host->caps = *caps;
4008 } else {
4009 host->caps = sdhci_readl(host, SDHCI_CAPABILITIES);
4010 host->caps &= ~lower_32_bits(dt_caps_mask);
4011 host->caps |= lower_32_bits(dt_caps);
4012 }
4013
4014 if (host->version < SDHCI_SPEC_300)
4015 return;
4016
4017 if (caps1) {
4018 host->caps1 = *caps1;
4019 } else {
4020 host->caps1 = sdhci_readl(host, SDHCI_CAPABILITIES_1);
4021 host->caps1 &= ~upper_32_bits(dt_caps_mask);
4022 host->caps1 |= upper_32_bits(dt_caps);
4023 }
4024}
4025EXPORT_SYMBOL_GPL(__sdhci_read_caps);
4026
4027static void sdhci_allocate_bounce_buffer(struct sdhci_host *host)
4028{
4029 struct mmc_host *mmc = host->mmc;
4030 unsigned int max_blocks;
4031 unsigned int bounce_size;
4032 int ret;
4033
4034 /*
4035 * Cap the bounce buffer at 64KB. Using a bigger bounce buffer
4036 * has diminishing returns, this is probably because SD/MMC
4037 * cards are usually optimized to handle this size of requests.
4038 */
4039 bounce_size = SZ_64K;
4040 /*
4041 * Adjust downwards to maximum request size if this is less
4042 * than our segment size, else hammer down the maximum
4043 * request size to the maximum buffer size.
4044 */
4045 if (mmc->max_req_size < bounce_size)
4046 bounce_size = mmc->max_req_size;
4047 max_blocks = bounce_size / 512;
4048
4049 /*
4050 * When we just support one segment, we can get significant
4051 * speedups by the help of a bounce buffer to group scattered
4052 * reads/writes together.
4053 */
4054 host->bounce_buffer = devm_kmalloc(mmc->parent,
4055 bounce_size,
4056 GFP_KERNEL);
4057 if (!host->bounce_buffer) {
4058 pr_err("%s: failed to allocate %u bytes for bounce buffer, falling back to single segments\n",
4059 mmc_hostname(mmc),
4060 bounce_size);
4061 /*
4062 * Exiting with zero here makes sure we proceed with
4063 * mmc->max_segs == 1.
4064 */
4065 return;
4066 }
4067
4068 host->bounce_addr = dma_map_single(mmc->parent,
4069 host->bounce_buffer,
4070 bounce_size,
4071 DMA_BIDIRECTIONAL);
4072 ret = dma_mapping_error(mmc->parent, host->bounce_addr);
4073 if (ret)
4074 /* Again fall back to max_segs == 1 */
4075 return;
4076 host->bounce_buffer_size = bounce_size;
4077
4078 /* Lie about this since we're bouncing */
4079 mmc->max_segs = max_blocks;
4080 mmc->max_seg_size = bounce_size;
4081 mmc->max_req_size = bounce_size;
4082
4083 pr_info("%s bounce up to %u segments into one, max segment size %u bytes\n",
4084 mmc_hostname(mmc), max_blocks, bounce_size);
4085}
4086
4087static inline bool sdhci_can_64bit_dma(struct sdhci_host *host)
4088{
4089 /*
4090 * According to SD Host Controller spec v4.10, bit[27] added from
4091 * version 4.10 in Capabilities Register is used as 64-bit System
4092 * Address support for V4 mode.
4093 */
4094 if (host->version >= SDHCI_SPEC_410 && host->v4_mode)
4095 return host->caps & SDHCI_CAN_64BIT_V4;
4096
4097 return host->caps & SDHCI_CAN_64BIT;
4098}
4099
4100int sdhci_setup_host(struct sdhci_host *host)
4101{
4102 struct mmc_host *mmc;
4103 u32 max_current_caps;
4104 unsigned int ocr_avail;
4105 unsigned int override_timeout_clk;
4106 u32 max_clk;
4107 int ret = 0;
4108 bool enable_vqmmc = false;
4109
4110 WARN_ON(host == NULL);
4111 if (host == NULL)
4112 return -EINVAL;
4113
4114 mmc = host->mmc;
4115
4116 /*
4117 * If there are external regulators, get them. Note this must be done
4118 * early before resetting the host and reading the capabilities so that
4119 * the host can take the appropriate action if regulators are not
4120 * available.
4121 */
4122 if (!mmc->supply.vqmmc) {
4123 ret = mmc_regulator_get_supply(mmc);
4124 if (ret)
4125 return ret;
4126 enable_vqmmc = true;
4127 }
4128
4129 DBG("Version: 0x%08x | Present: 0x%08x\n",
4130 sdhci_readw(host, SDHCI_HOST_VERSION),
4131 sdhci_readl(host, SDHCI_PRESENT_STATE));
4132 DBG("Caps: 0x%08x | Caps_1: 0x%08x\n",
4133 sdhci_readl(host, SDHCI_CAPABILITIES),
4134 sdhci_readl(host, SDHCI_CAPABILITIES_1));
4135
4136 sdhci_read_caps(host);
4137
4138 override_timeout_clk = host->timeout_clk;
4139
4140 if (host->version > SDHCI_SPEC_420) {
4141 pr_err("%s: Unknown controller version (%d). You may experience problems.\n",
4142 mmc_hostname(mmc), host->version);
4143 }
4144
4145 if (host->quirks & SDHCI_QUIRK_FORCE_DMA)
4146 host->flags |= SDHCI_USE_SDMA;
4147 else if (!(host->caps & SDHCI_CAN_DO_SDMA))
4148 DBG("Controller doesn't have SDMA capability\n");
4149 else
4150 host->flags |= SDHCI_USE_SDMA;
4151
4152 if ((host->quirks & SDHCI_QUIRK_BROKEN_DMA) &&
4153 (host->flags & SDHCI_USE_SDMA)) {
4154 DBG("Disabling DMA as it is marked broken\n");
4155 host->flags &= ~SDHCI_USE_SDMA;
4156 }
4157
4158 if ((host->version >= SDHCI_SPEC_200) &&
4159 (host->caps & SDHCI_CAN_DO_ADMA2))
4160 host->flags |= SDHCI_USE_ADMA;
4161
4162 if ((host->quirks & SDHCI_QUIRK_BROKEN_ADMA) &&
4163 (host->flags & SDHCI_USE_ADMA)) {
4164 DBG("Disabling ADMA as it is marked broken\n");
4165 host->flags &= ~SDHCI_USE_ADMA;
4166 }
4167
4168 if (sdhci_can_64bit_dma(host))
4169 host->flags |= SDHCI_USE_64_BIT_DMA;
4170
4171 if (host->use_external_dma) {
4172 ret = sdhci_external_dma_init(host);
4173 if (ret == -EPROBE_DEFER)
4174 goto unreg;
4175 /*
4176 * Fall back to use the DMA/PIO integrated in standard SDHCI
4177 * instead of external DMA devices.
4178 */
4179 else if (ret)
4180 sdhci_switch_external_dma(host, false);
4181 /* Disable internal DMA sources */
4182 else
4183 host->flags &= ~(SDHCI_USE_SDMA | SDHCI_USE_ADMA);
4184 }
4185
4186 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
4187 if (host->ops->set_dma_mask)
4188 ret = host->ops->set_dma_mask(host);
4189 else
4190 ret = sdhci_set_dma_mask(host);
4191
4192 if (!ret && host->ops->enable_dma)
4193 ret = host->ops->enable_dma(host);
4194
4195 if (ret) {
4196 pr_warn("%s: No suitable DMA available - falling back to PIO\n",
4197 mmc_hostname(mmc));
4198 host->flags &= ~(SDHCI_USE_SDMA | SDHCI_USE_ADMA);
4199
4200 ret = 0;
4201 }
4202 }
4203
4204 /* SDMA does not support 64-bit DMA if v4 mode not set */
4205 if ((host->flags & SDHCI_USE_64_BIT_DMA) && !host->v4_mode)
4206 host->flags &= ~SDHCI_USE_SDMA;
4207
4208 if (host->flags & SDHCI_USE_ADMA) {
4209 dma_addr_t dma;
4210 void *buf;
4211
4212 if (!(host->flags & SDHCI_USE_64_BIT_DMA))
4213 host->alloc_desc_sz = SDHCI_ADMA2_32_DESC_SZ;
4214 else if (!host->alloc_desc_sz)
4215 host->alloc_desc_sz = SDHCI_ADMA2_64_DESC_SZ(host);
4216
4217 host->desc_sz = host->alloc_desc_sz;
4218 host->adma_table_sz = host->adma_table_cnt * host->desc_sz;
4219
4220 host->align_buffer_sz = SDHCI_MAX_SEGS * SDHCI_ADMA2_ALIGN;
4221 /*
4222 * Use zalloc to zero the reserved high 32-bits of 128-bit
4223 * descriptors so that they never need to be written.
4224 */
4225 buf = dma_alloc_coherent(mmc_dev(mmc),
4226 host->align_buffer_sz + host->adma_table_sz,
4227 &dma, GFP_KERNEL);
4228 if (!buf) {
4229 pr_warn("%s: Unable to allocate ADMA buffers - falling back to standard DMA\n",
4230 mmc_hostname(mmc));
4231 host->flags &= ~SDHCI_USE_ADMA;
4232 } else if ((dma + host->align_buffer_sz) &
4233 (SDHCI_ADMA2_DESC_ALIGN - 1)) {
4234 pr_warn("%s: unable to allocate aligned ADMA descriptor\n",
4235 mmc_hostname(mmc));
4236 host->flags &= ~SDHCI_USE_ADMA;
4237 dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz +
4238 host->adma_table_sz, buf, dma);
4239 } else {
4240 host->align_buffer = buf;
4241 host->align_addr = dma;
4242
4243 host->adma_table = buf + host->align_buffer_sz;
4244 host->adma_addr = dma + host->align_buffer_sz;
4245 }
4246 }
4247
4248 /*
4249 * If we use DMA, then it's up to the caller to set the DMA
4250 * mask, but PIO does not need the hw shim so we set a new
4251 * mask here in that case.
4252 */
4253 if (!(host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA))) {
4254 host->dma_mask = DMA_BIT_MASK(64);
4255 mmc_dev(mmc)->dma_mask = &host->dma_mask;
4256 }
4257
4258 if (host->version >= SDHCI_SPEC_300)
4259 host->max_clk = FIELD_GET(SDHCI_CLOCK_V3_BASE_MASK, host->caps);
4260 else
4261 host->max_clk = FIELD_GET(SDHCI_CLOCK_BASE_MASK, host->caps);
4262
4263 host->max_clk *= 1000000;
4264 if (host->max_clk == 0 || host->quirks &
4265 SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN) {
4266 if (!host->ops->get_max_clock) {
4267 pr_err("%s: Hardware doesn't specify base clock frequency.\n",
4268 mmc_hostname(mmc));
4269 ret = -ENODEV;
4270 goto undma;
4271 }
4272 host->max_clk = host->ops->get_max_clock(host);
4273 }
4274
4275 /*
4276 * In case of Host Controller v3.00, find out whether clock
4277 * multiplier is supported.
4278 */
4279 host->clk_mul = FIELD_GET(SDHCI_CLOCK_MUL_MASK, host->caps1);
4280
4281 /*
4282 * In case the value in Clock Multiplier is 0, then programmable
4283 * clock mode is not supported, otherwise the actual clock
4284 * multiplier is one more than the value of Clock Multiplier
4285 * in the Capabilities Register.
4286 */
4287 if (host->clk_mul)
4288 host->clk_mul += 1;
4289
4290 /*
4291 * Set host parameters.
4292 */
4293 max_clk = host->max_clk;
4294
4295 if (host->ops->get_min_clock)
4296 mmc->f_min = host->ops->get_min_clock(host);
4297 else if (host->version >= SDHCI_SPEC_300) {
4298 if (host->clk_mul)
4299 max_clk = host->max_clk * host->clk_mul;
4300 /*
4301 * Divided Clock Mode minimum clock rate is always less than
4302 * Programmable Clock Mode minimum clock rate.
4303 */
4304 mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_300;
4305 } else
4306 mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_200;
4307
4308 if (!mmc->f_max || mmc->f_max > max_clk)
4309 mmc->f_max = max_clk;
4310
4311 if (!(host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK)) {
4312 host->timeout_clk = FIELD_GET(SDHCI_TIMEOUT_CLK_MASK, host->caps);
4313
4314 if (host->caps & SDHCI_TIMEOUT_CLK_UNIT)
4315 host->timeout_clk *= 1000;
4316
4317 if (host->timeout_clk == 0) {
4318 if (!host->ops->get_timeout_clock) {
4319 pr_err("%s: Hardware doesn't specify timeout clock frequency.\n",
4320 mmc_hostname(mmc));
4321 ret = -ENODEV;
4322 goto undma;
4323 }
4324
4325 host->timeout_clk =
4326 DIV_ROUND_UP(host->ops->get_timeout_clock(host),
4327 1000);
4328 }
4329
4330 if (override_timeout_clk)
4331 host->timeout_clk = override_timeout_clk;
4332
4333 mmc->max_busy_timeout = host->ops->get_max_timeout_count ?
4334 host->ops->get_max_timeout_count(host) : 1 << 27;
4335 mmc->max_busy_timeout /= host->timeout_clk;
4336 }
4337
4338 if (host->quirks2 & SDHCI_QUIRK2_DISABLE_HW_TIMEOUT &&
4339 !host->ops->get_max_timeout_count)
4340 mmc->max_busy_timeout = 0;
4341
4342 mmc->caps |= MMC_CAP_SDIO_IRQ | MMC_CAP_CMD23;
4343 mmc->caps2 |= MMC_CAP2_SDIO_IRQ_NOTHREAD;
4344
4345 if (host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12)
4346 host->flags |= SDHCI_AUTO_CMD12;
4347
4348 /*
4349 * For v3 mode, Auto-CMD23 stuff only works in ADMA or PIO.
4350 * For v4 mode, SDMA may use Auto-CMD23 as well.
4351 */
4352 if ((host->version >= SDHCI_SPEC_300) &&
4353 ((host->flags & SDHCI_USE_ADMA) ||
4354 !(host->flags & SDHCI_USE_SDMA) || host->v4_mode) &&
4355 !(host->quirks2 & SDHCI_QUIRK2_ACMD23_BROKEN)) {
4356 host->flags |= SDHCI_AUTO_CMD23;
4357 DBG("Auto-CMD23 available\n");
4358 } else {
4359 DBG("Auto-CMD23 unavailable\n");
4360 }
4361
4362 /*
4363 * A controller may support 8-bit width, but the board itself
4364 * might not have the pins brought out. Boards that support
4365 * 8-bit width must set "mmc->caps |= MMC_CAP_8_BIT_DATA;" in
4366 * their platform code before calling sdhci_add_host(), and we
4367 * won't assume 8-bit width for hosts without that CAP.
4368 */
4369 if (!(host->quirks & SDHCI_QUIRK_FORCE_1_BIT_DATA))
4370 mmc->caps |= MMC_CAP_4_BIT_DATA;
4371
4372 if (host->quirks2 & SDHCI_QUIRK2_HOST_NO_CMD23)
4373 mmc->caps &= ~MMC_CAP_CMD23;
4374
4375 if (host->caps & SDHCI_CAN_DO_HISPD)
4376 mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
4377
4378 if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) &&
4379 mmc_card_is_removable(mmc) &&
4380 mmc_gpio_get_cd(host->mmc) < 0)
4381 mmc->caps |= MMC_CAP_NEEDS_POLL;
4382
4383 if (!IS_ERR(mmc->supply.vqmmc)) {
4384 if (enable_vqmmc) {
4385 ret = regulator_enable(mmc->supply.vqmmc);
4386 host->sdhci_core_to_disable_vqmmc = !ret;
4387 }
4388
4389 /* If vqmmc provides no 1.8V signalling, then there's no UHS */
4390 if (!regulator_is_supported_voltage(mmc->supply.vqmmc, 1700000,
4391 1950000))
4392 host->caps1 &= ~(SDHCI_SUPPORT_SDR104 |
4393 SDHCI_SUPPORT_SDR50 |
4394 SDHCI_SUPPORT_DDR50);
4395
4396 /* In eMMC case vqmmc might be a fixed 1.8V regulator */
4397 if (!regulator_is_supported_voltage(mmc->supply.vqmmc, 2700000,
4398 3600000))
4399 host->flags &= ~SDHCI_SIGNALING_330;
4400
4401 if (ret) {
4402 pr_warn("%s: Failed to enable vqmmc regulator: %d\n",
4403 mmc_hostname(mmc), ret);
4404 mmc->supply.vqmmc = ERR_PTR(-EINVAL);
4405 }
4406
4407 }
4408
4409 if (host->quirks2 & SDHCI_QUIRK2_NO_1_8_V) {
4410 host->caps1 &= ~(SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 |
4411 SDHCI_SUPPORT_DDR50);
4412 /*
4413 * The SDHCI controller in a SoC might support HS200/HS400
4414 * (indicated using mmc-hs200-1_8v/mmc-hs400-1_8v dt property),
4415 * but if the board is modeled such that the IO lines are not
4416 * connected to 1.8v then HS200/HS400 cannot be supported.
4417 * Disable HS200/HS400 if the board does not have 1.8v connected
4418 * to the IO lines. (Applicable for other modes in 1.8v)
4419 */
4420 mmc->caps2 &= ~(MMC_CAP2_HSX00_1_8V | MMC_CAP2_HS400_ES);
4421 mmc->caps &= ~(MMC_CAP_1_8V_DDR | MMC_CAP_UHS);
4422 }
4423
4424 /* Any UHS-I mode in caps implies SDR12 and SDR25 support. */
4425 if (host->caps1 & (SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 |
4426 SDHCI_SUPPORT_DDR50))
4427 mmc->caps |= MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25;
4428
4429 /* SDR104 supports also implies SDR50 support */
4430 if (host->caps1 & SDHCI_SUPPORT_SDR104) {
4431 mmc->caps |= MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_SDR50;
4432 /* SD3.0: SDR104 is supported so (for eMMC) the caps2
4433 * field can be promoted to support HS200.
4434 */
4435 if (!(host->quirks2 & SDHCI_QUIRK2_BROKEN_HS200))
4436 mmc->caps2 |= MMC_CAP2_HS200;
4437 } else if (host->caps1 & SDHCI_SUPPORT_SDR50) {
4438 mmc->caps |= MMC_CAP_UHS_SDR50;
4439 }
4440
4441 if (host->quirks2 & SDHCI_QUIRK2_CAPS_BIT63_FOR_HS400 &&
4442 (host->caps1 & SDHCI_SUPPORT_HS400))
4443 mmc->caps2 |= MMC_CAP2_HS400;
4444
4445 if ((mmc->caps2 & MMC_CAP2_HSX00_1_2V) &&
4446 (IS_ERR(mmc->supply.vqmmc) ||
4447 !regulator_is_supported_voltage(mmc->supply.vqmmc, 1100000,
4448 1300000)))
4449 mmc->caps2 &= ~MMC_CAP2_HSX00_1_2V;
4450
4451 if ((host->caps1 & SDHCI_SUPPORT_DDR50) &&
4452 !(host->quirks2 & SDHCI_QUIRK2_BROKEN_DDR50))
4453 mmc->caps |= MMC_CAP_UHS_DDR50;
4454
4455 /* Does the host need tuning for SDR50? */
4456 if (host->caps1 & SDHCI_USE_SDR50_TUNING)
4457 host->flags |= SDHCI_SDR50_NEEDS_TUNING;
4458
4459 /* Driver Type(s) (A, C, D) supported by the host */
4460 if (host->caps1 & SDHCI_DRIVER_TYPE_A)
4461 mmc->caps |= MMC_CAP_DRIVER_TYPE_A;
4462 if (host->caps1 & SDHCI_DRIVER_TYPE_C)
4463 mmc->caps |= MMC_CAP_DRIVER_TYPE_C;
4464 if (host->caps1 & SDHCI_DRIVER_TYPE_D)
4465 mmc->caps |= MMC_CAP_DRIVER_TYPE_D;
4466
4467 /* Initial value for re-tuning timer count */
4468 host->tuning_count = FIELD_GET(SDHCI_RETUNING_TIMER_COUNT_MASK,
4469 host->caps1);
4470
4471 /*
4472 * In case Re-tuning Timer is not disabled, the actual value of
4473 * re-tuning timer will be 2 ^ (n - 1).
4474 */
4475 if (host->tuning_count)
4476 host->tuning_count = 1 << (host->tuning_count - 1);
4477
4478 /* Re-tuning mode supported by the Host Controller */
4479 host->tuning_mode = FIELD_GET(SDHCI_RETUNING_MODE_MASK, host->caps1);
4480
4481 ocr_avail = 0;
4482
4483 /*
4484 * According to SD Host Controller spec v3.00, if the Host System
4485 * can afford more than 150mA, Host Driver should set XPC to 1. Also
4486 * the value is meaningful only if Voltage Support in the Capabilities
4487 * register is set. The actual current value is 4 times the register
4488 * value.
4489 */
4490 max_current_caps = sdhci_readl(host, SDHCI_MAX_CURRENT);
4491 if (!max_current_caps && !IS_ERR(mmc->supply.vmmc)) {
4492 int curr = regulator_get_current_limit(mmc->supply.vmmc);
4493 if (curr > 0) {
4494
4495 /* convert to SDHCI_MAX_CURRENT format */
4496 curr = curr/1000; /* convert to mA */
4497 curr = curr/SDHCI_MAX_CURRENT_MULTIPLIER;
4498
4499 curr = min_t(u32, curr, SDHCI_MAX_CURRENT_LIMIT);
4500 max_current_caps =
4501 FIELD_PREP(SDHCI_MAX_CURRENT_330_MASK, curr) |
4502 FIELD_PREP(SDHCI_MAX_CURRENT_300_MASK, curr) |
4503 FIELD_PREP(SDHCI_MAX_CURRENT_180_MASK, curr);
4504 }
4505 }
4506
4507 if (host->caps & SDHCI_CAN_VDD_330) {
4508 ocr_avail |= MMC_VDD_32_33 | MMC_VDD_33_34;
4509
4510 mmc->max_current_330 = FIELD_GET(SDHCI_MAX_CURRENT_330_MASK,
4511 max_current_caps) *
4512 SDHCI_MAX_CURRENT_MULTIPLIER;
4513 }
4514 if (host->caps & SDHCI_CAN_VDD_300) {
4515 ocr_avail |= MMC_VDD_29_30 | MMC_VDD_30_31;
4516
4517 mmc->max_current_300 = FIELD_GET(SDHCI_MAX_CURRENT_300_MASK,
4518 max_current_caps) *
4519 SDHCI_MAX_CURRENT_MULTIPLIER;
4520 }
4521 if (host->caps & SDHCI_CAN_VDD_180) {
4522 ocr_avail |= MMC_VDD_165_195;
4523
4524 mmc->max_current_180 = FIELD_GET(SDHCI_MAX_CURRENT_180_MASK,
4525 max_current_caps) *
4526 SDHCI_MAX_CURRENT_MULTIPLIER;
4527 }
4528
4529 /* If OCR set by host, use it instead. */
4530 if (host->ocr_mask)
4531 ocr_avail = host->ocr_mask;
4532
4533 /* If OCR set by external regulators, give it highest prio. */
4534 if (mmc->ocr_avail)
4535 ocr_avail = mmc->ocr_avail;
4536
4537 mmc->ocr_avail = ocr_avail;
4538 mmc->ocr_avail_sdio = ocr_avail;
4539 if (host->ocr_avail_sdio)
4540 mmc->ocr_avail_sdio &= host->ocr_avail_sdio;
4541 mmc->ocr_avail_sd = ocr_avail;
4542 if (host->ocr_avail_sd)
4543 mmc->ocr_avail_sd &= host->ocr_avail_sd;
4544 else /* normal SD controllers don't support 1.8V */
4545 mmc->ocr_avail_sd &= ~MMC_VDD_165_195;
4546 mmc->ocr_avail_mmc = ocr_avail;
4547 if (host->ocr_avail_mmc)
4548 mmc->ocr_avail_mmc &= host->ocr_avail_mmc;
4549
4550 if (mmc->ocr_avail == 0) {
4551 pr_err("%s: Hardware doesn't report any support voltages.\n",
4552 mmc_hostname(mmc));
4553 ret = -ENODEV;
4554 goto unreg;
4555 }
4556
4557 if ((mmc->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
4558 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 |
4559 MMC_CAP_UHS_DDR50 | MMC_CAP_1_8V_DDR)) ||
4560 (mmc->caps2 & (MMC_CAP2_HS200_1_8V_SDR | MMC_CAP2_HS400_1_8V)))
4561 host->flags |= SDHCI_SIGNALING_180;
4562
4563 if (mmc->caps2 & MMC_CAP2_HSX00_1_2V)
4564 host->flags |= SDHCI_SIGNALING_120;
4565
4566 spin_lock_init(&host->lock);
4567
4568 /*
4569 * Maximum number of sectors in one transfer. Limited by SDMA boundary
4570 * size (512KiB). Note some tuning modes impose a 4MiB limit, but this
4571 * is less anyway.
4572 */
4573 mmc->max_req_size = 524288;
4574
4575 /*
4576 * Maximum number of segments. Depends on if the hardware
4577 * can do scatter/gather or not.
4578 */
4579 if (host->flags & SDHCI_USE_ADMA) {
4580 mmc->max_segs = SDHCI_MAX_SEGS;
4581 } else if (host->flags & SDHCI_USE_SDMA) {
4582 mmc->max_segs = 1;
4583 if (swiotlb_max_segment()) {
4584 unsigned int max_req_size = (1 << IO_TLB_SHIFT) *
4585 IO_TLB_SEGSIZE;
4586 mmc->max_req_size = min(mmc->max_req_size,
4587 max_req_size);
4588 }
4589 } else { /* PIO */
4590 mmc->max_segs = SDHCI_MAX_SEGS;
4591 }
4592
4593 /*
4594 * Maximum segment size. Could be one segment with the maximum number
4595 * of bytes. When doing hardware scatter/gather, each entry cannot
4596 * be larger than 64 KiB though.
4597 */
4598 if (host->flags & SDHCI_USE_ADMA) {
4599 if (host->quirks & SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC)
4600 mmc->max_seg_size = 65535;
4601 else
4602 mmc->max_seg_size = 65536;
4603 } else {
4604 mmc->max_seg_size = mmc->max_req_size;
4605 }
4606
4607 /*
4608 * Maximum block size. This varies from controller to controller and
4609 * is specified in the capabilities register.
4610 */
4611 if (host->quirks & SDHCI_QUIRK_FORCE_BLK_SZ_2048) {
4612 mmc->max_blk_size = 2;
4613 } else {
4614 mmc->max_blk_size = (host->caps & SDHCI_MAX_BLOCK_MASK) >>
4615 SDHCI_MAX_BLOCK_SHIFT;
4616 if (mmc->max_blk_size >= 3) {
4617 pr_warn("%s: Invalid maximum block size, assuming 512 bytes\n",
4618 mmc_hostname(mmc));
4619 mmc->max_blk_size = 0;
4620 }
4621 }
4622
4623 mmc->max_blk_size = 512 << mmc->max_blk_size;
4624
4625 /*
4626 * Maximum block count.
4627 */
4628 mmc->max_blk_count = (host->quirks & SDHCI_QUIRK_NO_MULTIBLOCK) ? 1 : 65535;
4629
4630 if (mmc->max_segs == 1)
4631 /* This may alter mmc->*_blk_* parameters */
4632 sdhci_allocate_bounce_buffer(host);
4633
4634 return 0;
4635
4636unreg:
4637 if (host->sdhci_core_to_disable_vqmmc)
4638 regulator_disable(mmc->supply.vqmmc);
4639undma:
4640 if (host->align_buffer)
4641 dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz +
4642 host->adma_table_sz, host->align_buffer,
4643 host->align_addr);
4644 host->adma_table = NULL;
4645 host->align_buffer = NULL;
4646
4647 return ret;
4648}
4649EXPORT_SYMBOL_GPL(sdhci_setup_host);
4650
4651void sdhci_cleanup_host(struct sdhci_host *host)
4652{
4653 struct mmc_host *mmc = host->mmc;
4654
4655 if (host->sdhci_core_to_disable_vqmmc)
4656 regulator_disable(mmc->supply.vqmmc);
4657
4658 if (host->align_buffer)
4659 dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz +
4660 host->adma_table_sz, host->align_buffer,
4661 host->align_addr);
4662
4663 if (host->use_external_dma)
4664 sdhci_external_dma_release(host);
4665
4666 host->adma_table = NULL;
4667 host->align_buffer = NULL;
4668}
4669EXPORT_SYMBOL_GPL(sdhci_cleanup_host);
4670
4671int __sdhci_add_host(struct sdhci_host *host)
4672{
4673 unsigned int flags = WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_HIGHPRI;
4674 struct mmc_host *mmc = host->mmc;
4675 int ret;
4676
4677 if ((mmc->caps2 & MMC_CAP2_CQE) &&
4678 (host->quirks & SDHCI_QUIRK_BROKEN_CQE)) {
4679 mmc->caps2 &= ~MMC_CAP2_CQE;
4680 mmc->cqe_ops = NULL;
4681 }
4682
4683 host->complete_wq = alloc_workqueue("sdhci", flags, 0);
4684 if (!host->complete_wq)
4685 return -ENOMEM;
4686
4687 INIT_WORK(&host->complete_work, sdhci_complete_work);
4688
4689 timer_setup(&host->timer, sdhci_timeout_timer, 0);
4690 timer_setup(&host->data_timer, sdhci_timeout_data_timer, 0);
4691
4692 init_waitqueue_head(&host->buf_ready_int);
4693
4694 sdhci_init(host, 0);
4695
4696 ret = request_threaded_irq(host->irq, sdhci_irq, sdhci_thread_irq,
4697 IRQF_SHARED, mmc_hostname(mmc), host);
4698 if (ret) {
4699 pr_err("%s: Failed to request IRQ %d: %d\n",
4700 mmc_hostname(mmc), host->irq, ret);
4701 goto unwq;
4702 }
4703
4704 ret = sdhci_led_register(host);
4705 if (ret) {
4706 pr_err("%s: Failed to register LED device: %d\n",
4707 mmc_hostname(mmc), ret);
4708 goto unirq;
4709 }
4710
4711 ret = mmc_add_host(mmc);
4712 if (ret)
4713 goto unled;
4714
4715 pr_info("%s: SDHCI controller on %s [%s] using %s\n",
4716 mmc_hostname(mmc), host->hw_name, dev_name(mmc_dev(mmc)),
4717 host->use_external_dma ? "External DMA" :
4718 (host->flags & SDHCI_USE_ADMA) ?
4719 (host->flags & SDHCI_USE_64_BIT_DMA) ? "ADMA 64-bit" : "ADMA" :
4720 (host->flags & SDHCI_USE_SDMA) ? "DMA" : "PIO");
4721
4722 sdhci_enable_card_detection(host);
4723
4724 return 0;
4725
4726unled:
4727 sdhci_led_unregister(host);
4728unirq:
4729 sdhci_do_reset(host, SDHCI_RESET_ALL);
4730 sdhci_writel(host, 0, SDHCI_INT_ENABLE);
4731 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
4732 free_irq(host->irq, host);
4733unwq:
4734 destroy_workqueue(host->complete_wq);
4735
4736 return ret;
4737}
4738EXPORT_SYMBOL_GPL(__sdhci_add_host);
4739
4740int sdhci_add_host(struct sdhci_host *host)
4741{
4742 int ret;
4743
4744 ret = sdhci_setup_host(host);
4745 if (ret)
4746 return ret;
4747
4748 ret = __sdhci_add_host(host);
4749 if (ret)
4750 goto cleanup;
4751
4752 return 0;
4753
4754cleanup:
4755 sdhci_cleanup_host(host);
4756
4757 return ret;
4758}
4759EXPORT_SYMBOL_GPL(sdhci_add_host);
4760
4761void sdhci_remove_host(struct sdhci_host *host, int dead)
4762{
4763 struct mmc_host *mmc = host->mmc;
4764 unsigned long flags;
4765
4766 if (dead) {
4767 spin_lock_irqsave(&host->lock, flags);
4768
4769 host->flags |= SDHCI_DEVICE_DEAD;
4770
4771 if (sdhci_has_requests(host)) {
4772 pr_err("%s: Controller removed during "
4773 " transfer!\n", mmc_hostname(mmc));
4774 sdhci_error_out_mrqs(host, -ENOMEDIUM);
4775 }
4776
4777 spin_unlock_irqrestore(&host->lock, flags);
4778 }
4779
4780 sdhci_disable_card_detection(host);
4781
4782 mmc_remove_host(mmc);
4783
4784 sdhci_led_unregister(host);
4785
4786 if (!dead)
4787 sdhci_do_reset(host, SDHCI_RESET_ALL);
4788
4789 sdhci_writel(host, 0, SDHCI_INT_ENABLE);
4790 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
4791 free_irq(host->irq, host);
4792
4793 del_timer_sync(&host->timer);
4794 del_timer_sync(&host->data_timer);
4795
4796 destroy_workqueue(host->complete_wq);
4797
4798 if (host->sdhci_core_to_disable_vqmmc)
4799 regulator_disable(mmc->supply.vqmmc);
4800
4801 if (host->align_buffer)
4802 dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz +
4803 host->adma_table_sz, host->align_buffer,
4804 host->align_addr);
4805
4806 if (host->use_external_dma)
4807 sdhci_external_dma_release(host);
4808
4809 host->adma_table = NULL;
4810 host->align_buffer = NULL;
4811}
4812
4813EXPORT_SYMBOL_GPL(sdhci_remove_host);
4814
4815void sdhci_free_host(struct sdhci_host *host)
4816{
4817 mmc_free_host(host->mmc);
4818}
4819
4820EXPORT_SYMBOL_GPL(sdhci_free_host);
4821
4822/*****************************************************************************\
4823 * *
4824 * Driver init/exit *
4825 * *
4826\*****************************************************************************/
4827
4828static int __init sdhci_drv_init(void)
4829{
4830 pr_info(DRIVER_NAME
4831 ": Secure Digital Host Controller Interface driver\n");
4832 pr_info(DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
4833
4834 return 0;
4835}
4836
4837static void __exit sdhci_drv_exit(void)
4838{
4839}
4840
4841module_init(sdhci_drv_init);
4842module_exit(sdhci_drv_exit);
4843
4844module_param(debug_quirks, uint, 0444);
4845module_param(debug_quirks2, uint, 0444);
4846
4847MODULE_AUTHOR("Pierre Ossman <pierre@ossman.eu>");
4848MODULE_DESCRIPTION("Secure Digital Host Controller Interface core driver");
4849MODULE_LICENSE("GPL");
4850
4851MODULE_PARM_DESC(debug_quirks, "Force certain quirks.");
4852MODULE_PARM_DESC(debug_quirks2, "Force certain other quirks.");