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[mirror_ubuntu-jammy-kernel.git] / drivers / mmc / host / sdhci.c
1 /*
2 * linux/drivers/mmc/host/sdhci.c - Secure Digital Host Controller Interface driver
3 *
4 * Copyright (C) 2005-2008 Pierre Ossman, All Rights Reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or (at
9 * your option) any later version.
10 *
11 * Thanks to the following companies for their support:
12 *
13 * - JMicron (hardware and technical support)
14 */
15
16 #include <linux/delay.h>
17 #include <linux/ktime.h>
18 #include <linux/highmem.h>
19 #include <linux/io.h>
20 #include <linux/module.h>
21 #include <linux/dma-mapping.h>
22 #include <linux/slab.h>
23 #include <linux/scatterlist.h>
24 #include <linux/swiotlb.h>
25 #include <linux/regulator/consumer.h>
26 #include <linux/pm_runtime.h>
27 #include <linux/of.h>
28
29 #include <linux/leds.h>
30
31 #include <linux/mmc/mmc.h>
32 #include <linux/mmc/host.h>
33 #include <linux/mmc/card.h>
34 #include <linux/mmc/sdio.h>
35 #include <linux/mmc/slot-gpio.h>
36
37 #include "sdhci.h"
38
39 #define DRIVER_NAME "sdhci"
40
41 #define DBG(f, x...) \
42 pr_debug("%s: " DRIVER_NAME ": " f, mmc_hostname(host->mmc), ## x)
43
44 #define SDHCI_DUMP(f, x...) \
45 pr_err("%s: " DRIVER_NAME ": " f, mmc_hostname(host->mmc), ## x)
46
47 #define MAX_TUNING_LOOP 40
48
49 static unsigned int debug_quirks = 0;
50 static unsigned int debug_quirks2;
51
52 static void sdhci_finish_data(struct sdhci_host *);
53
54 static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable);
55
56 void sdhci_dumpregs(struct sdhci_host *host)
57 {
58 SDHCI_DUMP("============ SDHCI REGISTER DUMP ===========\n");
59
60 SDHCI_DUMP("Sys addr: 0x%08x | Version: 0x%08x\n",
61 sdhci_readl(host, SDHCI_DMA_ADDRESS),
62 sdhci_readw(host, SDHCI_HOST_VERSION));
63 SDHCI_DUMP("Blk size: 0x%08x | Blk cnt: 0x%08x\n",
64 sdhci_readw(host, SDHCI_BLOCK_SIZE),
65 sdhci_readw(host, SDHCI_BLOCK_COUNT));
66 SDHCI_DUMP("Argument: 0x%08x | Trn mode: 0x%08x\n",
67 sdhci_readl(host, SDHCI_ARGUMENT),
68 sdhci_readw(host, SDHCI_TRANSFER_MODE));
69 SDHCI_DUMP("Present: 0x%08x | Host ctl: 0x%08x\n",
70 sdhci_readl(host, SDHCI_PRESENT_STATE),
71 sdhci_readb(host, SDHCI_HOST_CONTROL));
72 SDHCI_DUMP("Power: 0x%08x | Blk gap: 0x%08x\n",
73 sdhci_readb(host, SDHCI_POWER_CONTROL),
74 sdhci_readb(host, SDHCI_BLOCK_GAP_CONTROL));
75 SDHCI_DUMP("Wake-up: 0x%08x | Clock: 0x%08x\n",
76 sdhci_readb(host, SDHCI_WAKE_UP_CONTROL),
77 sdhci_readw(host, SDHCI_CLOCK_CONTROL));
78 SDHCI_DUMP("Timeout: 0x%08x | Int stat: 0x%08x\n",
79 sdhci_readb(host, SDHCI_TIMEOUT_CONTROL),
80 sdhci_readl(host, SDHCI_INT_STATUS));
81 SDHCI_DUMP("Int enab: 0x%08x | Sig enab: 0x%08x\n",
82 sdhci_readl(host, SDHCI_INT_ENABLE),
83 sdhci_readl(host, SDHCI_SIGNAL_ENABLE));
84 SDHCI_DUMP("AC12 err: 0x%08x | Slot int: 0x%08x\n",
85 sdhci_readw(host, SDHCI_ACMD12_ERR),
86 sdhci_readw(host, SDHCI_SLOT_INT_STATUS));
87 SDHCI_DUMP("Caps: 0x%08x | Caps_1: 0x%08x\n",
88 sdhci_readl(host, SDHCI_CAPABILITIES),
89 sdhci_readl(host, SDHCI_CAPABILITIES_1));
90 SDHCI_DUMP("Cmd: 0x%08x | Max curr: 0x%08x\n",
91 sdhci_readw(host, SDHCI_COMMAND),
92 sdhci_readl(host, SDHCI_MAX_CURRENT));
93 SDHCI_DUMP("Resp[0]: 0x%08x | Resp[1]: 0x%08x\n",
94 sdhci_readl(host, SDHCI_RESPONSE),
95 sdhci_readl(host, SDHCI_RESPONSE + 4));
96 SDHCI_DUMP("Resp[2]: 0x%08x | Resp[3]: 0x%08x\n",
97 sdhci_readl(host, SDHCI_RESPONSE + 8),
98 sdhci_readl(host, SDHCI_RESPONSE + 12));
99 SDHCI_DUMP("Host ctl2: 0x%08x\n",
100 sdhci_readw(host, SDHCI_HOST_CONTROL2));
101
102 if (host->flags & SDHCI_USE_ADMA) {
103 if (host->flags & SDHCI_USE_64_BIT_DMA) {
104 SDHCI_DUMP("ADMA Err: 0x%08x | ADMA Ptr: 0x%08x%08x\n",
105 sdhci_readl(host, SDHCI_ADMA_ERROR),
106 sdhci_readl(host, SDHCI_ADMA_ADDRESS_HI),
107 sdhci_readl(host, SDHCI_ADMA_ADDRESS));
108 } else {
109 SDHCI_DUMP("ADMA Err: 0x%08x | ADMA Ptr: 0x%08x\n",
110 sdhci_readl(host, SDHCI_ADMA_ERROR),
111 sdhci_readl(host, SDHCI_ADMA_ADDRESS));
112 }
113 }
114
115 SDHCI_DUMP("============================================\n");
116 }
117 EXPORT_SYMBOL_GPL(sdhci_dumpregs);
118
119 /*****************************************************************************\
120 * *
121 * Low level functions *
122 * *
123 \*****************************************************************************/
124
125 static inline bool sdhci_data_line_cmd(struct mmc_command *cmd)
126 {
127 return cmd->data || cmd->flags & MMC_RSP_BUSY;
128 }
129
130 static void sdhci_set_card_detection(struct sdhci_host *host, bool enable)
131 {
132 u32 present;
133
134 if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) ||
135 !mmc_card_is_removable(host->mmc))
136 return;
137
138 if (enable) {
139 present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
140 SDHCI_CARD_PRESENT;
141
142 host->ier |= present ? SDHCI_INT_CARD_REMOVE :
143 SDHCI_INT_CARD_INSERT;
144 } else {
145 host->ier &= ~(SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT);
146 }
147
148 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
149 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
150 }
151
152 static void sdhci_enable_card_detection(struct sdhci_host *host)
153 {
154 sdhci_set_card_detection(host, true);
155 }
156
157 static void sdhci_disable_card_detection(struct sdhci_host *host)
158 {
159 sdhci_set_card_detection(host, false);
160 }
161
162 static void sdhci_runtime_pm_bus_on(struct sdhci_host *host)
163 {
164 if (host->bus_on)
165 return;
166 host->bus_on = true;
167 pm_runtime_get_noresume(host->mmc->parent);
168 }
169
170 static void sdhci_runtime_pm_bus_off(struct sdhci_host *host)
171 {
172 if (!host->bus_on)
173 return;
174 host->bus_on = false;
175 pm_runtime_put_noidle(host->mmc->parent);
176 }
177
178 void sdhci_reset(struct sdhci_host *host, u8 mask)
179 {
180 ktime_t timeout;
181
182 sdhci_writeb(host, mask, SDHCI_SOFTWARE_RESET);
183
184 if (mask & SDHCI_RESET_ALL) {
185 host->clock = 0;
186 /* Reset-all turns off SD Bus Power */
187 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
188 sdhci_runtime_pm_bus_off(host);
189 }
190
191 /* Wait max 100 ms */
192 timeout = ktime_add_ms(ktime_get(), 100);
193
194 /* hw clears the bit when it's done */
195 while (sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask) {
196 if (ktime_after(ktime_get(), timeout)) {
197 pr_err("%s: Reset 0x%x never completed.\n",
198 mmc_hostname(host->mmc), (int)mask);
199 sdhci_dumpregs(host);
200 return;
201 }
202 udelay(10);
203 }
204 }
205 EXPORT_SYMBOL_GPL(sdhci_reset);
206
207 static void sdhci_do_reset(struct sdhci_host *host, u8 mask)
208 {
209 if (host->quirks & SDHCI_QUIRK_NO_CARD_NO_RESET) {
210 struct mmc_host *mmc = host->mmc;
211
212 if (!mmc->ops->get_cd(mmc))
213 return;
214 }
215
216 host->ops->reset(host, mask);
217
218 if (mask & SDHCI_RESET_ALL) {
219 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
220 if (host->ops->enable_dma)
221 host->ops->enable_dma(host);
222 }
223
224 /* Resetting the controller clears many */
225 host->preset_enabled = false;
226 }
227 }
228
229 static void sdhci_set_default_irqs(struct sdhci_host *host)
230 {
231 host->ier = SDHCI_INT_BUS_POWER | SDHCI_INT_DATA_END_BIT |
232 SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_TIMEOUT |
233 SDHCI_INT_INDEX | SDHCI_INT_END_BIT | SDHCI_INT_CRC |
234 SDHCI_INT_TIMEOUT | SDHCI_INT_DATA_END |
235 SDHCI_INT_RESPONSE;
236
237 if (host->tuning_mode == SDHCI_TUNING_MODE_2 ||
238 host->tuning_mode == SDHCI_TUNING_MODE_3)
239 host->ier |= SDHCI_INT_RETUNE;
240
241 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
242 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
243 }
244
245 static void sdhci_init(struct sdhci_host *host, int soft)
246 {
247 struct mmc_host *mmc = host->mmc;
248
249 if (soft)
250 sdhci_do_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
251 else
252 sdhci_do_reset(host, SDHCI_RESET_ALL);
253
254 sdhci_set_default_irqs(host);
255
256 host->cqe_on = false;
257
258 if (soft) {
259 /* force clock reconfiguration */
260 host->clock = 0;
261 mmc->ops->set_ios(mmc, &mmc->ios);
262 }
263 }
264
265 static void sdhci_reinit(struct sdhci_host *host)
266 {
267 sdhci_init(host, 0);
268 sdhci_enable_card_detection(host);
269 }
270
271 static void __sdhci_led_activate(struct sdhci_host *host)
272 {
273 u8 ctrl;
274
275 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
276 ctrl |= SDHCI_CTRL_LED;
277 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
278 }
279
280 static void __sdhci_led_deactivate(struct sdhci_host *host)
281 {
282 u8 ctrl;
283
284 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
285 ctrl &= ~SDHCI_CTRL_LED;
286 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
287 }
288
289 #if IS_REACHABLE(CONFIG_LEDS_CLASS)
290 static void sdhci_led_control(struct led_classdev *led,
291 enum led_brightness brightness)
292 {
293 struct sdhci_host *host = container_of(led, struct sdhci_host, led);
294 unsigned long flags;
295
296 spin_lock_irqsave(&host->lock, flags);
297
298 if (host->runtime_suspended)
299 goto out;
300
301 if (brightness == LED_OFF)
302 __sdhci_led_deactivate(host);
303 else
304 __sdhci_led_activate(host);
305 out:
306 spin_unlock_irqrestore(&host->lock, flags);
307 }
308
309 static int sdhci_led_register(struct sdhci_host *host)
310 {
311 struct mmc_host *mmc = host->mmc;
312
313 snprintf(host->led_name, sizeof(host->led_name),
314 "%s::", mmc_hostname(mmc));
315
316 host->led.name = host->led_name;
317 host->led.brightness = LED_OFF;
318 host->led.default_trigger = mmc_hostname(mmc);
319 host->led.brightness_set = sdhci_led_control;
320
321 return led_classdev_register(mmc_dev(mmc), &host->led);
322 }
323
324 static void sdhci_led_unregister(struct sdhci_host *host)
325 {
326 led_classdev_unregister(&host->led);
327 }
328
329 static inline void sdhci_led_activate(struct sdhci_host *host)
330 {
331 }
332
333 static inline void sdhci_led_deactivate(struct sdhci_host *host)
334 {
335 }
336
337 #else
338
339 static inline int sdhci_led_register(struct sdhci_host *host)
340 {
341 return 0;
342 }
343
344 static inline void sdhci_led_unregister(struct sdhci_host *host)
345 {
346 }
347
348 static inline void sdhci_led_activate(struct sdhci_host *host)
349 {
350 __sdhci_led_activate(host);
351 }
352
353 static inline void sdhci_led_deactivate(struct sdhci_host *host)
354 {
355 __sdhci_led_deactivate(host);
356 }
357
358 #endif
359
360 /*****************************************************************************\
361 * *
362 * Core functions *
363 * *
364 \*****************************************************************************/
365
366 static void sdhci_read_block_pio(struct sdhci_host *host)
367 {
368 unsigned long flags;
369 size_t blksize, len, chunk;
370 u32 uninitialized_var(scratch);
371 u8 *buf;
372
373 DBG("PIO reading\n");
374
375 blksize = host->data->blksz;
376 chunk = 0;
377
378 local_irq_save(flags);
379
380 while (blksize) {
381 BUG_ON(!sg_miter_next(&host->sg_miter));
382
383 len = min(host->sg_miter.length, blksize);
384
385 blksize -= len;
386 host->sg_miter.consumed = len;
387
388 buf = host->sg_miter.addr;
389
390 while (len) {
391 if (chunk == 0) {
392 scratch = sdhci_readl(host, SDHCI_BUFFER);
393 chunk = 4;
394 }
395
396 *buf = scratch & 0xFF;
397
398 buf++;
399 scratch >>= 8;
400 chunk--;
401 len--;
402 }
403 }
404
405 sg_miter_stop(&host->sg_miter);
406
407 local_irq_restore(flags);
408 }
409
410 static void sdhci_write_block_pio(struct sdhci_host *host)
411 {
412 unsigned long flags;
413 size_t blksize, len, chunk;
414 u32 scratch;
415 u8 *buf;
416
417 DBG("PIO writing\n");
418
419 blksize = host->data->blksz;
420 chunk = 0;
421 scratch = 0;
422
423 local_irq_save(flags);
424
425 while (blksize) {
426 BUG_ON(!sg_miter_next(&host->sg_miter));
427
428 len = min(host->sg_miter.length, blksize);
429
430 blksize -= len;
431 host->sg_miter.consumed = len;
432
433 buf = host->sg_miter.addr;
434
435 while (len) {
436 scratch |= (u32)*buf << (chunk * 8);
437
438 buf++;
439 chunk++;
440 len--;
441
442 if ((chunk == 4) || ((len == 0) && (blksize == 0))) {
443 sdhci_writel(host, scratch, SDHCI_BUFFER);
444 chunk = 0;
445 scratch = 0;
446 }
447 }
448 }
449
450 sg_miter_stop(&host->sg_miter);
451
452 local_irq_restore(flags);
453 }
454
455 static void sdhci_transfer_pio(struct sdhci_host *host)
456 {
457 u32 mask;
458
459 if (host->blocks == 0)
460 return;
461
462 if (host->data->flags & MMC_DATA_READ)
463 mask = SDHCI_DATA_AVAILABLE;
464 else
465 mask = SDHCI_SPACE_AVAILABLE;
466
467 /*
468 * Some controllers (JMicron JMB38x) mess up the buffer bits
469 * for transfers < 4 bytes. As long as it is just one block,
470 * we can ignore the bits.
471 */
472 if ((host->quirks & SDHCI_QUIRK_BROKEN_SMALL_PIO) &&
473 (host->data->blocks == 1))
474 mask = ~0;
475
476 while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) {
477 if (host->quirks & SDHCI_QUIRK_PIO_NEEDS_DELAY)
478 udelay(100);
479
480 if (host->data->flags & MMC_DATA_READ)
481 sdhci_read_block_pio(host);
482 else
483 sdhci_write_block_pio(host);
484
485 host->blocks--;
486 if (host->blocks == 0)
487 break;
488 }
489
490 DBG("PIO transfer complete.\n");
491 }
492
493 static int sdhci_pre_dma_transfer(struct sdhci_host *host,
494 struct mmc_data *data, int cookie)
495 {
496 int sg_count;
497
498 /*
499 * If the data buffers are already mapped, return the previous
500 * dma_map_sg() result.
501 */
502 if (data->host_cookie == COOKIE_PRE_MAPPED)
503 return data->sg_count;
504
505 sg_count = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
506 mmc_get_dma_dir(data));
507
508 if (sg_count == 0)
509 return -ENOSPC;
510
511 data->sg_count = sg_count;
512 data->host_cookie = cookie;
513
514 return sg_count;
515 }
516
517 static char *sdhci_kmap_atomic(struct scatterlist *sg, unsigned long *flags)
518 {
519 local_irq_save(*flags);
520 return kmap_atomic(sg_page(sg)) + sg->offset;
521 }
522
523 static void sdhci_kunmap_atomic(void *buffer, unsigned long *flags)
524 {
525 kunmap_atomic(buffer);
526 local_irq_restore(*flags);
527 }
528
529 static void sdhci_adma_write_desc(struct sdhci_host *host, void *desc,
530 dma_addr_t addr, int len, unsigned cmd)
531 {
532 struct sdhci_adma2_64_desc *dma_desc = desc;
533
534 /* 32-bit and 64-bit descriptors have these members in same position */
535 dma_desc->cmd = cpu_to_le16(cmd);
536 dma_desc->len = cpu_to_le16(len);
537 dma_desc->addr_lo = cpu_to_le32((u32)addr);
538
539 if (host->flags & SDHCI_USE_64_BIT_DMA)
540 dma_desc->addr_hi = cpu_to_le32((u64)addr >> 32);
541 }
542
543 static void sdhci_adma_mark_end(void *desc)
544 {
545 struct sdhci_adma2_64_desc *dma_desc = desc;
546
547 /* 32-bit and 64-bit descriptors have 'cmd' in same position */
548 dma_desc->cmd |= cpu_to_le16(ADMA2_END);
549 }
550
551 static void sdhci_adma_table_pre(struct sdhci_host *host,
552 struct mmc_data *data, int sg_count)
553 {
554 struct scatterlist *sg;
555 unsigned long flags;
556 dma_addr_t addr, align_addr;
557 void *desc, *align;
558 char *buffer;
559 int len, offset, i;
560
561 /*
562 * The spec does not specify endianness of descriptor table.
563 * We currently guess that it is LE.
564 */
565
566 host->sg_count = sg_count;
567
568 desc = host->adma_table;
569 align = host->align_buffer;
570
571 align_addr = host->align_addr;
572
573 for_each_sg(data->sg, sg, host->sg_count, i) {
574 addr = sg_dma_address(sg);
575 len = sg_dma_len(sg);
576
577 /*
578 * The SDHCI specification states that ADMA addresses must
579 * be 32-bit aligned. If they aren't, then we use a bounce
580 * buffer for the (up to three) bytes that screw up the
581 * alignment.
582 */
583 offset = (SDHCI_ADMA2_ALIGN - (addr & SDHCI_ADMA2_MASK)) &
584 SDHCI_ADMA2_MASK;
585 if (offset) {
586 if (data->flags & MMC_DATA_WRITE) {
587 buffer = sdhci_kmap_atomic(sg, &flags);
588 memcpy(align, buffer, offset);
589 sdhci_kunmap_atomic(buffer, &flags);
590 }
591
592 /* tran, valid */
593 sdhci_adma_write_desc(host, desc, align_addr, offset,
594 ADMA2_TRAN_VALID);
595
596 BUG_ON(offset > 65536);
597
598 align += SDHCI_ADMA2_ALIGN;
599 align_addr += SDHCI_ADMA2_ALIGN;
600
601 desc += host->desc_sz;
602
603 addr += offset;
604 len -= offset;
605 }
606
607 BUG_ON(len > 65536);
608
609 if (len) {
610 /* tran, valid */
611 sdhci_adma_write_desc(host, desc, addr, len,
612 ADMA2_TRAN_VALID);
613 desc += host->desc_sz;
614 }
615
616 /*
617 * If this triggers then we have a calculation bug
618 * somewhere. :/
619 */
620 WARN_ON((desc - host->adma_table) >= host->adma_table_sz);
621 }
622
623 if (host->quirks & SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC) {
624 /* Mark the last descriptor as the terminating descriptor */
625 if (desc != host->adma_table) {
626 desc -= host->desc_sz;
627 sdhci_adma_mark_end(desc);
628 }
629 } else {
630 /* Add a terminating entry - nop, end, valid */
631 sdhci_adma_write_desc(host, desc, 0, 0, ADMA2_NOP_END_VALID);
632 }
633 }
634
635 static void sdhci_adma_table_post(struct sdhci_host *host,
636 struct mmc_data *data)
637 {
638 struct scatterlist *sg;
639 int i, size;
640 void *align;
641 char *buffer;
642 unsigned long flags;
643
644 if (data->flags & MMC_DATA_READ) {
645 bool has_unaligned = false;
646
647 /* Do a quick scan of the SG list for any unaligned mappings */
648 for_each_sg(data->sg, sg, host->sg_count, i)
649 if (sg_dma_address(sg) & SDHCI_ADMA2_MASK) {
650 has_unaligned = true;
651 break;
652 }
653
654 if (has_unaligned) {
655 dma_sync_sg_for_cpu(mmc_dev(host->mmc), data->sg,
656 data->sg_len, DMA_FROM_DEVICE);
657
658 align = host->align_buffer;
659
660 for_each_sg(data->sg, sg, host->sg_count, i) {
661 if (sg_dma_address(sg) & SDHCI_ADMA2_MASK) {
662 size = SDHCI_ADMA2_ALIGN -
663 (sg_dma_address(sg) & SDHCI_ADMA2_MASK);
664
665 buffer = sdhci_kmap_atomic(sg, &flags);
666 memcpy(buffer, align, size);
667 sdhci_kunmap_atomic(buffer, &flags);
668
669 align += SDHCI_ADMA2_ALIGN;
670 }
671 }
672 }
673 }
674 }
675
676 static u8 sdhci_calc_timeout(struct sdhci_host *host, struct mmc_command *cmd)
677 {
678 u8 count;
679 struct mmc_data *data = cmd->data;
680 unsigned target_timeout, current_timeout;
681
682 /*
683 * If the host controller provides us with an incorrect timeout
684 * value, just skip the check and use 0xE. The hardware may take
685 * longer to time out, but that's much better than having a too-short
686 * timeout value.
687 */
688 if (host->quirks & SDHCI_QUIRK_BROKEN_TIMEOUT_VAL)
689 return 0xE;
690
691 /* Unspecified timeout, assume max */
692 if (!data && !cmd->busy_timeout)
693 return 0xE;
694
695 /* timeout in us */
696 if (!data)
697 target_timeout = cmd->busy_timeout * 1000;
698 else {
699 target_timeout = DIV_ROUND_UP(data->timeout_ns, 1000);
700 if (host->clock && data->timeout_clks) {
701 unsigned long long val;
702
703 /*
704 * data->timeout_clks is in units of clock cycles.
705 * host->clock is in Hz. target_timeout is in us.
706 * Hence, us = 1000000 * cycles / Hz. Round up.
707 */
708 val = 1000000ULL * data->timeout_clks;
709 if (do_div(val, host->clock))
710 target_timeout++;
711 target_timeout += val;
712 }
713 }
714
715 /*
716 * Figure out needed cycles.
717 * We do this in steps in order to fit inside a 32 bit int.
718 * The first step is the minimum timeout, which will have a
719 * minimum resolution of 6 bits:
720 * (1) 2^13*1000 > 2^22,
721 * (2) host->timeout_clk < 2^16
722 * =>
723 * (1) / (2) > 2^6
724 */
725 count = 0;
726 current_timeout = (1 << 13) * 1000 / host->timeout_clk;
727 while (current_timeout < target_timeout) {
728 count++;
729 current_timeout <<= 1;
730 if (count >= 0xF)
731 break;
732 }
733
734 if (count >= 0xF) {
735 DBG("Too large timeout 0x%x requested for CMD%d!\n",
736 count, cmd->opcode);
737 count = 0xE;
738 }
739
740 return count;
741 }
742
743 static void sdhci_set_transfer_irqs(struct sdhci_host *host)
744 {
745 u32 pio_irqs = SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL;
746 u32 dma_irqs = SDHCI_INT_DMA_END | SDHCI_INT_ADMA_ERROR;
747
748 if (host->flags & SDHCI_REQ_USE_DMA)
749 host->ier = (host->ier & ~pio_irqs) | dma_irqs;
750 else
751 host->ier = (host->ier & ~dma_irqs) | pio_irqs;
752
753 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
754 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
755 }
756
757 static void sdhci_set_timeout(struct sdhci_host *host, struct mmc_command *cmd)
758 {
759 u8 count;
760
761 if (host->ops->set_timeout) {
762 host->ops->set_timeout(host, cmd);
763 } else {
764 count = sdhci_calc_timeout(host, cmd);
765 sdhci_writeb(host, count, SDHCI_TIMEOUT_CONTROL);
766 }
767 }
768
769 static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd)
770 {
771 u8 ctrl;
772 struct mmc_data *data = cmd->data;
773
774 if (sdhci_data_line_cmd(cmd))
775 sdhci_set_timeout(host, cmd);
776
777 if (!data)
778 return;
779
780 WARN_ON(host->data);
781
782 /* Sanity checks */
783 BUG_ON(data->blksz * data->blocks > 524288);
784 BUG_ON(data->blksz > host->mmc->max_blk_size);
785 BUG_ON(data->blocks > 65535);
786
787 host->data = data;
788 host->data_early = 0;
789 host->data->bytes_xfered = 0;
790
791 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
792 struct scatterlist *sg;
793 unsigned int length_mask, offset_mask;
794 int i;
795
796 host->flags |= SDHCI_REQ_USE_DMA;
797
798 /*
799 * FIXME: This doesn't account for merging when mapping the
800 * scatterlist.
801 *
802 * The assumption here being that alignment and lengths are
803 * the same after DMA mapping to device address space.
804 */
805 length_mask = 0;
806 offset_mask = 0;
807 if (host->flags & SDHCI_USE_ADMA) {
808 if (host->quirks & SDHCI_QUIRK_32BIT_ADMA_SIZE) {
809 length_mask = 3;
810 /*
811 * As we use up to 3 byte chunks to work
812 * around alignment problems, we need to
813 * check the offset as well.
814 */
815 offset_mask = 3;
816 }
817 } else {
818 if (host->quirks & SDHCI_QUIRK_32BIT_DMA_SIZE)
819 length_mask = 3;
820 if (host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR)
821 offset_mask = 3;
822 }
823
824 if (unlikely(length_mask | offset_mask)) {
825 for_each_sg(data->sg, sg, data->sg_len, i) {
826 if (sg->length & length_mask) {
827 DBG("Reverting to PIO because of transfer size (%d)\n",
828 sg->length);
829 host->flags &= ~SDHCI_REQ_USE_DMA;
830 break;
831 }
832 if (sg->offset & offset_mask) {
833 DBG("Reverting to PIO because of bad alignment\n");
834 host->flags &= ~SDHCI_REQ_USE_DMA;
835 break;
836 }
837 }
838 }
839 }
840
841 if (host->flags & SDHCI_REQ_USE_DMA) {
842 int sg_cnt = sdhci_pre_dma_transfer(host, data, COOKIE_MAPPED);
843
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 if (host->flags & SDHCI_USE_ADMA) {
852 sdhci_adma_table_pre(host, data, sg_cnt);
853
854 sdhci_writel(host, host->adma_addr, SDHCI_ADMA_ADDRESS);
855 if (host->flags & SDHCI_USE_64_BIT_DMA)
856 sdhci_writel(host,
857 (u64)host->adma_addr >> 32,
858 SDHCI_ADMA_ADDRESS_HI);
859 } else {
860 WARN_ON(sg_cnt != 1);
861 sdhci_writel(host, sg_dma_address(data->sg),
862 SDHCI_DMA_ADDRESS);
863 }
864 }
865
866 /*
867 * Always adjust the DMA selection as some controllers
868 * (e.g. JMicron) can't do PIO properly when the selection
869 * is ADMA.
870 */
871 if (host->version >= SDHCI_SPEC_200) {
872 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
873 ctrl &= ~SDHCI_CTRL_DMA_MASK;
874 if ((host->flags & SDHCI_REQ_USE_DMA) &&
875 (host->flags & SDHCI_USE_ADMA)) {
876 if (host->flags & SDHCI_USE_64_BIT_DMA)
877 ctrl |= SDHCI_CTRL_ADMA64;
878 else
879 ctrl |= SDHCI_CTRL_ADMA32;
880 } else {
881 ctrl |= SDHCI_CTRL_SDMA;
882 }
883 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
884 }
885
886 if (!(host->flags & SDHCI_REQ_USE_DMA)) {
887 int flags;
888
889 flags = SG_MITER_ATOMIC;
890 if (host->data->flags & MMC_DATA_READ)
891 flags |= SG_MITER_TO_SG;
892 else
893 flags |= SG_MITER_FROM_SG;
894 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
895 host->blocks = data->blocks;
896 }
897
898 sdhci_set_transfer_irqs(host);
899
900 /* Set the DMA boundary value and block size */
901 sdhci_writew(host, SDHCI_MAKE_BLKSZ(host->sdma_boundary, data->blksz),
902 SDHCI_BLOCK_SIZE);
903 sdhci_writew(host, data->blocks, SDHCI_BLOCK_COUNT);
904 }
905
906 static inline bool sdhci_auto_cmd12(struct sdhci_host *host,
907 struct mmc_request *mrq)
908 {
909 return !mrq->sbc && (host->flags & SDHCI_AUTO_CMD12) &&
910 !mrq->cap_cmd_during_tfr;
911 }
912
913 static void sdhci_set_transfer_mode(struct sdhci_host *host,
914 struct mmc_command *cmd)
915 {
916 u16 mode = 0;
917 struct mmc_data *data = cmd->data;
918
919 if (data == NULL) {
920 if (host->quirks2 &
921 SDHCI_QUIRK2_CLEAR_TRANSFERMODE_REG_BEFORE_CMD) {
922 sdhci_writew(host, 0x0, SDHCI_TRANSFER_MODE);
923 } else {
924 /* clear Auto CMD settings for no data CMDs */
925 mode = sdhci_readw(host, SDHCI_TRANSFER_MODE);
926 sdhci_writew(host, mode & ~(SDHCI_TRNS_AUTO_CMD12 |
927 SDHCI_TRNS_AUTO_CMD23), SDHCI_TRANSFER_MODE);
928 }
929 return;
930 }
931
932 WARN_ON(!host->data);
933
934 if (!(host->quirks2 & SDHCI_QUIRK2_SUPPORT_SINGLE))
935 mode = SDHCI_TRNS_BLK_CNT_EN;
936
937 if (mmc_op_multi(cmd->opcode) || data->blocks > 1) {
938 mode = SDHCI_TRNS_BLK_CNT_EN | SDHCI_TRNS_MULTI;
939 /*
940 * If we are sending CMD23, CMD12 never gets sent
941 * on successful completion (so no Auto-CMD12).
942 */
943 if (sdhci_auto_cmd12(host, cmd->mrq) &&
944 (cmd->opcode != SD_IO_RW_EXTENDED))
945 mode |= SDHCI_TRNS_AUTO_CMD12;
946 else if (cmd->mrq->sbc && (host->flags & SDHCI_AUTO_CMD23)) {
947 mode |= SDHCI_TRNS_AUTO_CMD23;
948 sdhci_writel(host, cmd->mrq->sbc->arg, SDHCI_ARGUMENT2);
949 }
950 }
951
952 if (data->flags & MMC_DATA_READ)
953 mode |= SDHCI_TRNS_READ;
954 if (host->flags & SDHCI_REQ_USE_DMA)
955 mode |= SDHCI_TRNS_DMA;
956
957 sdhci_writew(host, mode, SDHCI_TRANSFER_MODE);
958 }
959
960 static bool sdhci_needs_reset(struct sdhci_host *host, struct mmc_request *mrq)
961 {
962 return (!(host->flags & SDHCI_DEVICE_DEAD) &&
963 ((mrq->cmd && mrq->cmd->error) ||
964 (mrq->sbc && mrq->sbc->error) ||
965 (mrq->data && ((mrq->data->error && !mrq->data->stop) ||
966 (mrq->data->stop && mrq->data->stop->error))) ||
967 (host->quirks & SDHCI_QUIRK_RESET_AFTER_REQUEST)));
968 }
969
970 static void __sdhci_finish_mrq(struct sdhci_host *host, struct mmc_request *mrq)
971 {
972 int i;
973
974 for (i = 0; i < SDHCI_MAX_MRQS; i++) {
975 if (host->mrqs_done[i] == mrq) {
976 WARN_ON(1);
977 return;
978 }
979 }
980
981 for (i = 0; i < SDHCI_MAX_MRQS; i++) {
982 if (!host->mrqs_done[i]) {
983 host->mrqs_done[i] = mrq;
984 break;
985 }
986 }
987
988 WARN_ON(i >= SDHCI_MAX_MRQS);
989
990 tasklet_schedule(&host->finish_tasklet);
991 }
992
993 static void sdhci_finish_mrq(struct sdhci_host *host, struct mmc_request *mrq)
994 {
995 if (host->cmd && host->cmd->mrq == mrq)
996 host->cmd = NULL;
997
998 if (host->data_cmd && host->data_cmd->mrq == mrq)
999 host->data_cmd = NULL;
1000
1001 if (host->data && host->data->mrq == mrq)
1002 host->data = NULL;
1003
1004 if (sdhci_needs_reset(host, mrq))
1005 host->pending_reset = true;
1006
1007 __sdhci_finish_mrq(host, mrq);
1008 }
1009
1010 static void sdhci_finish_data(struct sdhci_host *host)
1011 {
1012 struct mmc_command *data_cmd = host->data_cmd;
1013 struct mmc_data *data = host->data;
1014
1015 host->data = NULL;
1016 host->data_cmd = NULL;
1017
1018 if ((host->flags & (SDHCI_REQ_USE_DMA | SDHCI_USE_ADMA)) ==
1019 (SDHCI_REQ_USE_DMA | SDHCI_USE_ADMA))
1020 sdhci_adma_table_post(host, data);
1021
1022 /*
1023 * The specification states that the block count register must
1024 * be updated, but it does not specify at what point in the
1025 * data flow. That makes the register entirely useless to read
1026 * back so we have to assume that nothing made it to the card
1027 * in the event of an error.
1028 */
1029 if (data->error)
1030 data->bytes_xfered = 0;
1031 else
1032 data->bytes_xfered = data->blksz * data->blocks;
1033
1034 /*
1035 * Need to send CMD12 if -
1036 * a) open-ended multiblock transfer (no CMD23)
1037 * b) error in multiblock transfer
1038 */
1039 if (data->stop &&
1040 (data->error ||
1041 !data->mrq->sbc)) {
1042
1043 /*
1044 * The controller needs a reset of internal state machines
1045 * upon error conditions.
1046 */
1047 if (data->error) {
1048 if (!host->cmd || host->cmd == data_cmd)
1049 sdhci_do_reset(host, SDHCI_RESET_CMD);
1050 sdhci_do_reset(host, SDHCI_RESET_DATA);
1051 }
1052
1053 /*
1054 * 'cap_cmd_during_tfr' request must not use the command line
1055 * after mmc_command_done() has been called. It is upper layer's
1056 * responsibility to send the stop command if required.
1057 */
1058 if (data->mrq->cap_cmd_during_tfr) {
1059 sdhci_finish_mrq(host, data->mrq);
1060 } else {
1061 /* Avoid triggering warning in sdhci_send_command() */
1062 host->cmd = NULL;
1063 sdhci_send_command(host, data->stop);
1064 }
1065 } else {
1066 sdhci_finish_mrq(host, data->mrq);
1067 }
1068 }
1069
1070 static void sdhci_mod_timer(struct sdhci_host *host, struct mmc_request *mrq,
1071 unsigned long timeout)
1072 {
1073 if (sdhci_data_line_cmd(mrq->cmd))
1074 mod_timer(&host->data_timer, timeout);
1075 else
1076 mod_timer(&host->timer, timeout);
1077 }
1078
1079 static void sdhci_del_timer(struct sdhci_host *host, struct mmc_request *mrq)
1080 {
1081 if (sdhci_data_line_cmd(mrq->cmd))
1082 del_timer(&host->data_timer);
1083 else
1084 del_timer(&host->timer);
1085 }
1086
1087 void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
1088 {
1089 int flags;
1090 u32 mask;
1091 unsigned long timeout;
1092
1093 WARN_ON(host->cmd);
1094
1095 /* Initially, a command has no error */
1096 cmd->error = 0;
1097
1098 if ((host->quirks2 & SDHCI_QUIRK2_STOP_WITH_TC) &&
1099 cmd->opcode == MMC_STOP_TRANSMISSION)
1100 cmd->flags |= MMC_RSP_BUSY;
1101
1102 /* Wait max 10 ms */
1103 timeout = 10;
1104
1105 mask = SDHCI_CMD_INHIBIT;
1106 if (sdhci_data_line_cmd(cmd))
1107 mask |= SDHCI_DATA_INHIBIT;
1108
1109 /* We shouldn't wait for data inihibit for stop commands, even
1110 though they might use busy signaling */
1111 if (cmd->mrq->data && (cmd == cmd->mrq->data->stop))
1112 mask &= ~SDHCI_DATA_INHIBIT;
1113
1114 while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) {
1115 if (timeout == 0) {
1116 pr_err("%s: Controller never released inhibit bit(s).\n",
1117 mmc_hostname(host->mmc));
1118 sdhci_dumpregs(host);
1119 cmd->error = -EIO;
1120 sdhci_finish_mrq(host, cmd->mrq);
1121 return;
1122 }
1123 timeout--;
1124 mdelay(1);
1125 }
1126
1127 timeout = jiffies;
1128 if (!cmd->data && cmd->busy_timeout > 9000)
1129 timeout += DIV_ROUND_UP(cmd->busy_timeout, 1000) * HZ + HZ;
1130 else
1131 timeout += 10 * HZ;
1132 sdhci_mod_timer(host, cmd->mrq, timeout);
1133
1134 host->cmd = cmd;
1135 if (sdhci_data_line_cmd(cmd)) {
1136 WARN_ON(host->data_cmd);
1137 host->data_cmd = cmd;
1138 }
1139
1140 sdhci_prepare_data(host, cmd);
1141
1142 sdhci_writel(host, cmd->arg, SDHCI_ARGUMENT);
1143
1144 sdhci_set_transfer_mode(host, cmd);
1145
1146 if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
1147 pr_err("%s: Unsupported response type!\n",
1148 mmc_hostname(host->mmc));
1149 cmd->error = -EINVAL;
1150 sdhci_finish_mrq(host, cmd->mrq);
1151 return;
1152 }
1153
1154 if (!(cmd->flags & MMC_RSP_PRESENT))
1155 flags = SDHCI_CMD_RESP_NONE;
1156 else if (cmd->flags & MMC_RSP_136)
1157 flags = SDHCI_CMD_RESP_LONG;
1158 else if (cmd->flags & MMC_RSP_BUSY)
1159 flags = SDHCI_CMD_RESP_SHORT_BUSY;
1160 else
1161 flags = SDHCI_CMD_RESP_SHORT;
1162
1163 if (cmd->flags & MMC_RSP_CRC)
1164 flags |= SDHCI_CMD_CRC;
1165 if (cmd->flags & MMC_RSP_OPCODE)
1166 flags |= SDHCI_CMD_INDEX;
1167
1168 /* CMD19 is special in that the Data Present Select should be set */
1169 if (cmd->data || cmd->opcode == MMC_SEND_TUNING_BLOCK ||
1170 cmd->opcode == MMC_SEND_TUNING_BLOCK_HS200)
1171 flags |= SDHCI_CMD_DATA;
1172
1173 sdhci_writew(host, SDHCI_MAKE_CMD(cmd->opcode, flags), SDHCI_COMMAND);
1174 }
1175 EXPORT_SYMBOL_GPL(sdhci_send_command);
1176
1177 static void sdhci_read_rsp_136(struct sdhci_host *host, struct mmc_command *cmd)
1178 {
1179 int i, reg;
1180
1181 for (i = 0; i < 4; i++) {
1182 reg = SDHCI_RESPONSE + (3 - i) * 4;
1183 cmd->resp[i] = sdhci_readl(host, reg);
1184 }
1185
1186 if (host->quirks2 & SDHCI_QUIRK2_RSP_136_HAS_CRC)
1187 return;
1188
1189 /* CRC is stripped so we need to do some shifting */
1190 for (i = 0; i < 4; i++) {
1191 cmd->resp[i] <<= 8;
1192 if (i != 3)
1193 cmd->resp[i] |= cmd->resp[i + 1] >> 24;
1194 }
1195 }
1196
1197 static void sdhci_finish_command(struct sdhci_host *host)
1198 {
1199 struct mmc_command *cmd = host->cmd;
1200
1201 host->cmd = NULL;
1202
1203 if (cmd->flags & MMC_RSP_PRESENT) {
1204 if (cmd->flags & MMC_RSP_136) {
1205 sdhci_read_rsp_136(host, cmd);
1206 } else {
1207 cmd->resp[0] = sdhci_readl(host, SDHCI_RESPONSE);
1208 }
1209 }
1210
1211 if (cmd->mrq->cap_cmd_during_tfr && cmd == cmd->mrq->cmd)
1212 mmc_command_done(host->mmc, cmd->mrq);
1213
1214 /*
1215 * The host can send and interrupt when the busy state has
1216 * ended, allowing us to wait without wasting CPU cycles.
1217 * The busy signal uses DAT0 so this is similar to waiting
1218 * for data to complete.
1219 *
1220 * Note: The 1.0 specification is a bit ambiguous about this
1221 * feature so there might be some problems with older
1222 * controllers.
1223 */
1224 if (cmd->flags & MMC_RSP_BUSY) {
1225 if (cmd->data) {
1226 DBG("Cannot wait for busy signal when also doing a data transfer");
1227 } else if (!(host->quirks & SDHCI_QUIRK_NO_BUSY_IRQ) &&
1228 cmd == host->data_cmd) {
1229 /* Command complete before busy is ended */
1230 return;
1231 }
1232 }
1233
1234 /* Finished CMD23, now send actual command. */
1235 if (cmd == cmd->mrq->sbc) {
1236 sdhci_send_command(host, cmd->mrq->cmd);
1237 } else {
1238
1239 /* Processed actual command. */
1240 if (host->data && host->data_early)
1241 sdhci_finish_data(host);
1242
1243 if (!cmd->data)
1244 sdhci_finish_mrq(host, cmd->mrq);
1245 }
1246 }
1247
1248 static u16 sdhci_get_preset_value(struct sdhci_host *host)
1249 {
1250 u16 preset = 0;
1251
1252 switch (host->timing) {
1253 case MMC_TIMING_UHS_SDR12:
1254 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR12);
1255 break;
1256 case MMC_TIMING_UHS_SDR25:
1257 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR25);
1258 break;
1259 case MMC_TIMING_UHS_SDR50:
1260 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR50);
1261 break;
1262 case MMC_TIMING_UHS_SDR104:
1263 case MMC_TIMING_MMC_HS200:
1264 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR104);
1265 break;
1266 case MMC_TIMING_UHS_DDR50:
1267 case MMC_TIMING_MMC_DDR52:
1268 preset = sdhci_readw(host, SDHCI_PRESET_FOR_DDR50);
1269 break;
1270 case MMC_TIMING_MMC_HS400:
1271 preset = sdhci_readw(host, SDHCI_PRESET_FOR_HS400);
1272 break;
1273 default:
1274 pr_warn("%s: Invalid UHS-I mode selected\n",
1275 mmc_hostname(host->mmc));
1276 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR12);
1277 break;
1278 }
1279 return preset;
1280 }
1281
1282 u16 sdhci_calc_clk(struct sdhci_host *host, unsigned int clock,
1283 unsigned int *actual_clock)
1284 {
1285 int div = 0; /* Initialized for compiler warning */
1286 int real_div = div, clk_mul = 1;
1287 u16 clk = 0;
1288 bool switch_base_clk = false;
1289
1290 if (host->version >= SDHCI_SPEC_300) {
1291 if (host->preset_enabled) {
1292 u16 pre_val;
1293
1294 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1295 pre_val = sdhci_get_preset_value(host);
1296 div = (pre_val & SDHCI_PRESET_SDCLK_FREQ_MASK)
1297 >> SDHCI_PRESET_SDCLK_FREQ_SHIFT;
1298 if (host->clk_mul &&
1299 (pre_val & SDHCI_PRESET_CLKGEN_SEL_MASK)) {
1300 clk = SDHCI_PROG_CLOCK_MODE;
1301 real_div = div + 1;
1302 clk_mul = host->clk_mul;
1303 } else {
1304 real_div = max_t(int, 1, div << 1);
1305 }
1306 goto clock_set;
1307 }
1308
1309 /*
1310 * Check if the Host Controller supports Programmable Clock
1311 * Mode.
1312 */
1313 if (host->clk_mul) {
1314 for (div = 1; div <= 1024; div++) {
1315 if ((host->max_clk * host->clk_mul / div)
1316 <= clock)
1317 break;
1318 }
1319 if ((host->max_clk * host->clk_mul / div) <= clock) {
1320 /*
1321 * Set Programmable Clock Mode in the Clock
1322 * Control register.
1323 */
1324 clk = SDHCI_PROG_CLOCK_MODE;
1325 real_div = div;
1326 clk_mul = host->clk_mul;
1327 div--;
1328 } else {
1329 /*
1330 * Divisor can be too small to reach clock
1331 * speed requirement. Then use the base clock.
1332 */
1333 switch_base_clk = true;
1334 }
1335 }
1336
1337 if (!host->clk_mul || switch_base_clk) {
1338 /* Version 3.00 divisors must be a multiple of 2. */
1339 if (host->max_clk <= clock)
1340 div = 1;
1341 else {
1342 for (div = 2; div < SDHCI_MAX_DIV_SPEC_300;
1343 div += 2) {
1344 if ((host->max_clk / div) <= clock)
1345 break;
1346 }
1347 }
1348 real_div = div;
1349 div >>= 1;
1350 if ((host->quirks2 & SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN)
1351 && !div && host->max_clk <= 25000000)
1352 div = 1;
1353 }
1354 } else {
1355 /* Version 2.00 divisors must be a power of 2. */
1356 for (div = 1; div < SDHCI_MAX_DIV_SPEC_200; div *= 2) {
1357 if ((host->max_clk / div) <= clock)
1358 break;
1359 }
1360 real_div = div;
1361 div >>= 1;
1362 }
1363
1364 clock_set:
1365 if (real_div)
1366 *actual_clock = (host->max_clk * clk_mul) / real_div;
1367 clk |= (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT;
1368 clk |= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN)
1369 << SDHCI_DIVIDER_HI_SHIFT;
1370
1371 return clk;
1372 }
1373 EXPORT_SYMBOL_GPL(sdhci_calc_clk);
1374
1375 void sdhci_enable_clk(struct sdhci_host *host, u16 clk)
1376 {
1377 ktime_t timeout;
1378
1379 clk |= SDHCI_CLOCK_INT_EN;
1380 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1381
1382 /* Wait max 20 ms */
1383 timeout = ktime_add_ms(ktime_get(), 20);
1384 while (!((clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL))
1385 & SDHCI_CLOCK_INT_STABLE)) {
1386 if (ktime_after(ktime_get(), timeout)) {
1387 pr_err("%s: Internal clock never stabilised.\n",
1388 mmc_hostname(host->mmc));
1389 sdhci_dumpregs(host);
1390 return;
1391 }
1392 udelay(10);
1393 }
1394
1395 clk |= SDHCI_CLOCK_CARD_EN;
1396 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1397 }
1398 EXPORT_SYMBOL_GPL(sdhci_enable_clk);
1399
1400 void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
1401 {
1402 u16 clk;
1403
1404 host->mmc->actual_clock = 0;
1405
1406 sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
1407
1408 if (clock == 0)
1409 return;
1410
1411 clk = sdhci_calc_clk(host, clock, &host->mmc->actual_clock);
1412 sdhci_enable_clk(host, clk);
1413 }
1414 EXPORT_SYMBOL_GPL(sdhci_set_clock);
1415
1416 static void sdhci_set_power_reg(struct sdhci_host *host, unsigned char mode,
1417 unsigned short vdd)
1418 {
1419 struct mmc_host *mmc = host->mmc;
1420
1421 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
1422
1423 if (mode != MMC_POWER_OFF)
1424 sdhci_writeb(host, SDHCI_POWER_ON, SDHCI_POWER_CONTROL);
1425 else
1426 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
1427 }
1428
1429 void sdhci_set_power_noreg(struct sdhci_host *host, unsigned char mode,
1430 unsigned short vdd)
1431 {
1432 u8 pwr = 0;
1433
1434 if (mode != MMC_POWER_OFF) {
1435 switch (1 << vdd) {
1436 case MMC_VDD_165_195:
1437 pwr = SDHCI_POWER_180;
1438 break;
1439 case MMC_VDD_29_30:
1440 case MMC_VDD_30_31:
1441 pwr = SDHCI_POWER_300;
1442 break;
1443 case MMC_VDD_32_33:
1444 case MMC_VDD_33_34:
1445 pwr = SDHCI_POWER_330;
1446 break;
1447 default:
1448 WARN(1, "%s: Invalid vdd %#x\n",
1449 mmc_hostname(host->mmc), vdd);
1450 break;
1451 }
1452 }
1453
1454 if (host->pwr == pwr)
1455 return;
1456
1457 host->pwr = pwr;
1458
1459 if (pwr == 0) {
1460 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
1461 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
1462 sdhci_runtime_pm_bus_off(host);
1463 } else {
1464 /*
1465 * Spec says that we should clear the power reg before setting
1466 * a new value. Some controllers don't seem to like this though.
1467 */
1468 if (!(host->quirks & SDHCI_QUIRK_SINGLE_POWER_WRITE))
1469 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
1470
1471 /*
1472 * At least the Marvell CaFe chip gets confused if we set the
1473 * voltage and set turn on power at the same time, so set the
1474 * voltage first.
1475 */
1476 if (host->quirks & SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER)
1477 sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
1478
1479 pwr |= SDHCI_POWER_ON;
1480
1481 sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
1482
1483 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
1484 sdhci_runtime_pm_bus_on(host);
1485
1486 /*
1487 * Some controllers need an extra 10ms delay of 10ms before
1488 * they can apply clock after applying power
1489 */
1490 if (host->quirks & SDHCI_QUIRK_DELAY_AFTER_POWER)
1491 mdelay(10);
1492 }
1493 }
1494 EXPORT_SYMBOL_GPL(sdhci_set_power_noreg);
1495
1496 void sdhci_set_power(struct sdhci_host *host, unsigned char mode,
1497 unsigned short vdd)
1498 {
1499 if (IS_ERR(host->mmc->supply.vmmc))
1500 sdhci_set_power_noreg(host, mode, vdd);
1501 else
1502 sdhci_set_power_reg(host, mode, vdd);
1503 }
1504 EXPORT_SYMBOL_GPL(sdhci_set_power);
1505
1506 /*****************************************************************************\
1507 * *
1508 * MMC callbacks *
1509 * *
1510 \*****************************************************************************/
1511
1512 static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
1513 {
1514 struct sdhci_host *host;
1515 int present;
1516 unsigned long flags;
1517
1518 host = mmc_priv(mmc);
1519
1520 /* Firstly check card presence */
1521 present = mmc->ops->get_cd(mmc);
1522
1523 spin_lock_irqsave(&host->lock, flags);
1524
1525 sdhci_led_activate(host);
1526
1527 /*
1528 * Ensure we don't send the STOP for non-SET_BLOCK_COUNTED
1529 * requests if Auto-CMD12 is enabled.
1530 */
1531 if (sdhci_auto_cmd12(host, mrq)) {
1532 if (mrq->stop) {
1533 mrq->data->stop = NULL;
1534 mrq->stop = NULL;
1535 }
1536 }
1537
1538 if (!present || host->flags & SDHCI_DEVICE_DEAD) {
1539 mrq->cmd->error = -ENOMEDIUM;
1540 sdhci_finish_mrq(host, mrq);
1541 } else {
1542 if (mrq->sbc && !(host->flags & SDHCI_AUTO_CMD23))
1543 sdhci_send_command(host, mrq->sbc);
1544 else
1545 sdhci_send_command(host, mrq->cmd);
1546 }
1547
1548 mmiowb();
1549 spin_unlock_irqrestore(&host->lock, flags);
1550 }
1551
1552 void sdhci_set_bus_width(struct sdhci_host *host, int width)
1553 {
1554 u8 ctrl;
1555
1556 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
1557 if (width == MMC_BUS_WIDTH_8) {
1558 ctrl &= ~SDHCI_CTRL_4BITBUS;
1559 ctrl |= SDHCI_CTRL_8BITBUS;
1560 } else {
1561 if (host->mmc->caps & MMC_CAP_8_BIT_DATA)
1562 ctrl &= ~SDHCI_CTRL_8BITBUS;
1563 if (width == MMC_BUS_WIDTH_4)
1564 ctrl |= SDHCI_CTRL_4BITBUS;
1565 else
1566 ctrl &= ~SDHCI_CTRL_4BITBUS;
1567 }
1568 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1569 }
1570 EXPORT_SYMBOL_GPL(sdhci_set_bus_width);
1571
1572 void sdhci_set_uhs_signaling(struct sdhci_host *host, unsigned timing)
1573 {
1574 u16 ctrl_2;
1575
1576 ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1577 /* Select Bus Speed Mode for host */
1578 ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
1579 if ((timing == MMC_TIMING_MMC_HS200) ||
1580 (timing == MMC_TIMING_UHS_SDR104))
1581 ctrl_2 |= SDHCI_CTRL_UHS_SDR104;
1582 else if (timing == MMC_TIMING_UHS_SDR12)
1583 ctrl_2 |= SDHCI_CTRL_UHS_SDR12;
1584 else if (timing == MMC_TIMING_UHS_SDR25)
1585 ctrl_2 |= SDHCI_CTRL_UHS_SDR25;
1586 else if (timing == MMC_TIMING_UHS_SDR50)
1587 ctrl_2 |= SDHCI_CTRL_UHS_SDR50;
1588 else if ((timing == MMC_TIMING_UHS_DDR50) ||
1589 (timing == MMC_TIMING_MMC_DDR52))
1590 ctrl_2 |= SDHCI_CTRL_UHS_DDR50;
1591 else if (timing == MMC_TIMING_MMC_HS400)
1592 ctrl_2 |= SDHCI_CTRL_HS400; /* Non-standard */
1593 sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
1594 }
1595 EXPORT_SYMBOL_GPL(sdhci_set_uhs_signaling);
1596
1597 void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1598 {
1599 struct sdhci_host *host = mmc_priv(mmc);
1600 u8 ctrl;
1601
1602 if (ios->power_mode == MMC_POWER_UNDEFINED)
1603 return;
1604
1605 if (host->flags & SDHCI_DEVICE_DEAD) {
1606 if (!IS_ERR(mmc->supply.vmmc) &&
1607 ios->power_mode == MMC_POWER_OFF)
1608 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
1609 return;
1610 }
1611
1612 /*
1613 * Reset the chip on each power off.
1614 * Should clear out any weird states.
1615 */
1616 if (ios->power_mode == MMC_POWER_OFF) {
1617 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
1618 sdhci_reinit(host);
1619 }
1620
1621 if (host->version >= SDHCI_SPEC_300 &&
1622 (ios->power_mode == MMC_POWER_UP) &&
1623 !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN))
1624 sdhci_enable_preset_value(host, false);
1625
1626 if (!ios->clock || ios->clock != host->clock) {
1627 host->ops->set_clock(host, ios->clock);
1628 host->clock = ios->clock;
1629
1630 if (host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK &&
1631 host->clock) {
1632 host->timeout_clk = host->mmc->actual_clock ?
1633 host->mmc->actual_clock / 1000 :
1634 host->clock / 1000;
1635 host->mmc->max_busy_timeout =
1636 host->ops->get_max_timeout_count ?
1637 host->ops->get_max_timeout_count(host) :
1638 1 << 27;
1639 host->mmc->max_busy_timeout /= host->timeout_clk;
1640 }
1641 }
1642
1643 if (host->ops->set_power)
1644 host->ops->set_power(host, ios->power_mode, ios->vdd);
1645 else
1646 sdhci_set_power(host, ios->power_mode, ios->vdd);
1647
1648 if (host->ops->platform_send_init_74_clocks)
1649 host->ops->platform_send_init_74_clocks(host, ios->power_mode);
1650
1651 host->ops->set_bus_width(host, ios->bus_width);
1652
1653 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
1654
1655 if (!(host->quirks & SDHCI_QUIRK_NO_HISPD_BIT)) {
1656 if (ios->timing == MMC_TIMING_SD_HS ||
1657 ios->timing == MMC_TIMING_MMC_HS ||
1658 ios->timing == MMC_TIMING_MMC_HS400 ||
1659 ios->timing == MMC_TIMING_MMC_HS200 ||
1660 ios->timing == MMC_TIMING_MMC_DDR52 ||
1661 ios->timing == MMC_TIMING_UHS_SDR50 ||
1662 ios->timing == MMC_TIMING_UHS_SDR104 ||
1663 ios->timing == MMC_TIMING_UHS_DDR50 ||
1664 ios->timing == MMC_TIMING_UHS_SDR25)
1665 ctrl |= SDHCI_CTRL_HISPD;
1666 else
1667 ctrl &= ~SDHCI_CTRL_HISPD;
1668 }
1669
1670 if (host->version >= SDHCI_SPEC_300) {
1671 u16 clk, ctrl_2;
1672
1673 if (!host->preset_enabled) {
1674 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1675 /*
1676 * We only need to set Driver Strength if the
1677 * preset value enable is not set.
1678 */
1679 ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1680 ctrl_2 &= ~SDHCI_CTRL_DRV_TYPE_MASK;
1681 if (ios->drv_type == MMC_SET_DRIVER_TYPE_A)
1682 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_A;
1683 else if (ios->drv_type == MMC_SET_DRIVER_TYPE_B)
1684 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_B;
1685 else if (ios->drv_type == MMC_SET_DRIVER_TYPE_C)
1686 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_C;
1687 else if (ios->drv_type == MMC_SET_DRIVER_TYPE_D)
1688 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_D;
1689 else {
1690 pr_warn("%s: invalid driver type, default to driver type B\n",
1691 mmc_hostname(mmc));
1692 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_B;
1693 }
1694
1695 sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
1696 } else {
1697 /*
1698 * According to SDHC Spec v3.00, if the Preset Value
1699 * Enable in the Host Control 2 register is set, we
1700 * need to reset SD Clock Enable before changing High
1701 * Speed Enable to avoid generating clock gliches.
1702 */
1703
1704 /* Reset SD Clock Enable */
1705 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1706 clk &= ~SDHCI_CLOCK_CARD_EN;
1707 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1708
1709 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1710
1711 /* Re-enable SD Clock */
1712 host->ops->set_clock(host, host->clock);
1713 }
1714
1715 /* Reset SD Clock Enable */
1716 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1717 clk &= ~SDHCI_CLOCK_CARD_EN;
1718 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1719
1720 host->ops->set_uhs_signaling(host, ios->timing);
1721 host->timing = ios->timing;
1722
1723 if (!(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN) &&
1724 ((ios->timing == MMC_TIMING_UHS_SDR12) ||
1725 (ios->timing == MMC_TIMING_UHS_SDR25) ||
1726 (ios->timing == MMC_TIMING_UHS_SDR50) ||
1727 (ios->timing == MMC_TIMING_UHS_SDR104) ||
1728 (ios->timing == MMC_TIMING_UHS_DDR50) ||
1729 (ios->timing == MMC_TIMING_MMC_DDR52))) {
1730 u16 preset;
1731
1732 sdhci_enable_preset_value(host, true);
1733 preset = sdhci_get_preset_value(host);
1734 ios->drv_type = (preset & SDHCI_PRESET_DRV_MASK)
1735 >> SDHCI_PRESET_DRV_SHIFT;
1736 }
1737
1738 /* Re-enable SD Clock */
1739 host->ops->set_clock(host, host->clock);
1740 } else
1741 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1742
1743 /*
1744 * Some (ENE) controllers go apeshit on some ios operation,
1745 * signalling timeout and CRC errors even on CMD0. Resetting
1746 * it on each ios seems to solve the problem.
1747 */
1748 if (host->quirks & SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS)
1749 sdhci_do_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
1750
1751 mmiowb();
1752 }
1753 EXPORT_SYMBOL_GPL(sdhci_set_ios);
1754
1755 static int sdhci_get_cd(struct mmc_host *mmc)
1756 {
1757 struct sdhci_host *host = mmc_priv(mmc);
1758 int gpio_cd = mmc_gpio_get_cd(mmc);
1759
1760 if (host->flags & SDHCI_DEVICE_DEAD)
1761 return 0;
1762
1763 /* If nonremovable, assume that the card is always present. */
1764 if (!mmc_card_is_removable(host->mmc))
1765 return 1;
1766
1767 /*
1768 * Try slot gpio detect, if defined it take precedence
1769 * over build in controller functionality
1770 */
1771 if (gpio_cd >= 0)
1772 return !!gpio_cd;
1773
1774 /* If polling, assume that the card is always present. */
1775 if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
1776 return 1;
1777
1778 /* Host native card detect */
1779 return !!(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT);
1780 }
1781
1782 static int sdhci_check_ro(struct sdhci_host *host)
1783 {
1784 unsigned long flags;
1785 int is_readonly;
1786
1787 spin_lock_irqsave(&host->lock, flags);
1788
1789 if (host->flags & SDHCI_DEVICE_DEAD)
1790 is_readonly = 0;
1791 else if (host->ops->get_ro)
1792 is_readonly = host->ops->get_ro(host);
1793 else
1794 is_readonly = !(sdhci_readl(host, SDHCI_PRESENT_STATE)
1795 & SDHCI_WRITE_PROTECT);
1796
1797 spin_unlock_irqrestore(&host->lock, flags);
1798
1799 /* This quirk needs to be replaced by a callback-function later */
1800 return host->quirks & SDHCI_QUIRK_INVERTED_WRITE_PROTECT ?
1801 !is_readonly : is_readonly;
1802 }
1803
1804 #define SAMPLE_COUNT 5
1805
1806 static int sdhci_get_ro(struct mmc_host *mmc)
1807 {
1808 struct sdhci_host *host = mmc_priv(mmc);
1809 int i, ro_count;
1810
1811 if (!(host->quirks & SDHCI_QUIRK_UNSTABLE_RO_DETECT))
1812 return sdhci_check_ro(host);
1813
1814 ro_count = 0;
1815 for (i = 0; i < SAMPLE_COUNT; i++) {
1816 if (sdhci_check_ro(host)) {
1817 if (++ro_count > SAMPLE_COUNT / 2)
1818 return 1;
1819 }
1820 msleep(30);
1821 }
1822 return 0;
1823 }
1824
1825 static void sdhci_hw_reset(struct mmc_host *mmc)
1826 {
1827 struct sdhci_host *host = mmc_priv(mmc);
1828
1829 if (host->ops && host->ops->hw_reset)
1830 host->ops->hw_reset(host);
1831 }
1832
1833 static void sdhci_enable_sdio_irq_nolock(struct sdhci_host *host, int enable)
1834 {
1835 if (!(host->flags & SDHCI_DEVICE_DEAD)) {
1836 if (enable)
1837 host->ier |= SDHCI_INT_CARD_INT;
1838 else
1839 host->ier &= ~SDHCI_INT_CARD_INT;
1840
1841 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
1842 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
1843 mmiowb();
1844 }
1845 }
1846
1847 void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable)
1848 {
1849 struct sdhci_host *host = mmc_priv(mmc);
1850 unsigned long flags;
1851
1852 if (enable)
1853 pm_runtime_get_noresume(host->mmc->parent);
1854
1855 spin_lock_irqsave(&host->lock, flags);
1856 if (enable)
1857 host->flags |= SDHCI_SDIO_IRQ_ENABLED;
1858 else
1859 host->flags &= ~SDHCI_SDIO_IRQ_ENABLED;
1860
1861 sdhci_enable_sdio_irq_nolock(host, enable);
1862 spin_unlock_irqrestore(&host->lock, flags);
1863
1864 if (!enable)
1865 pm_runtime_put_noidle(host->mmc->parent);
1866 }
1867 EXPORT_SYMBOL_GPL(sdhci_enable_sdio_irq);
1868
1869 int sdhci_start_signal_voltage_switch(struct mmc_host *mmc,
1870 struct mmc_ios *ios)
1871 {
1872 struct sdhci_host *host = mmc_priv(mmc);
1873 u16 ctrl;
1874 int ret;
1875
1876 /*
1877 * Signal Voltage Switching is only applicable for Host Controllers
1878 * v3.00 and above.
1879 */
1880 if (host->version < SDHCI_SPEC_300)
1881 return 0;
1882
1883 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1884
1885 switch (ios->signal_voltage) {
1886 case MMC_SIGNAL_VOLTAGE_330:
1887 if (!(host->flags & SDHCI_SIGNALING_330))
1888 return -EINVAL;
1889 /* Set 1.8V Signal Enable in the Host Control2 register to 0 */
1890 ctrl &= ~SDHCI_CTRL_VDD_180;
1891 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1892
1893 if (!IS_ERR(mmc->supply.vqmmc)) {
1894 ret = mmc_regulator_set_vqmmc(mmc, ios);
1895 if (ret) {
1896 pr_warn("%s: Switching to 3.3V signalling voltage failed\n",
1897 mmc_hostname(mmc));
1898 return -EIO;
1899 }
1900 }
1901 /* Wait for 5ms */
1902 usleep_range(5000, 5500);
1903
1904 /* 3.3V regulator output should be stable within 5 ms */
1905 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1906 if (!(ctrl & SDHCI_CTRL_VDD_180))
1907 return 0;
1908
1909 pr_warn("%s: 3.3V regulator output did not became stable\n",
1910 mmc_hostname(mmc));
1911
1912 return -EAGAIN;
1913 case MMC_SIGNAL_VOLTAGE_180:
1914 if (!(host->flags & SDHCI_SIGNALING_180))
1915 return -EINVAL;
1916 if (!IS_ERR(mmc->supply.vqmmc)) {
1917 ret = mmc_regulator_set_vqmmc(mmc, ios);
1918 if (ret) {
1919 pr_warn("%s: Switching to 1.8V signalling voltage failed\n",
1920 mmc_hostname(mmc));
1921 return -EIO;
1922 }
1923 }
1924
1925 /*
1926 * Enable 1.8V Signal Enable in the Host Control2
1927 * register
1928 */
1929 ctrl |= SDHCI_CTRL_VDD_180;
1930 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1931
1932 /* Some controller need to do more when switching */
1933 if (host->ops->voltage_switch)
1934 host->ops->voltage_switch(host);
1935
1936 /* 1.8V regulator output should be stable within 5 ms */
1937 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1938 if (ctrl & SDHCI_CTRL_VDD_180)
1939 return 0;
1940
1941 pr_warn("%s: 1.8V regulator output did not became stable\n",
1942 mmc_hostname(mmc));
1943
1944 return -EAGAIN;
1945 case MMC_SIGNAL_VOLTAGE_120:
1946 if (!(host->flags & SDHCI_SIGNALING_120))
1947 return -EINVAL;
1948 if (!IS_ERR(mmc->supply.vqmmc)) {
1949 ret = mmc_regulator_set_vqmmc(mmc, ios);
1950 if (ret) {
1951 pr_warn("%s: Switching to 1.2V signalling voltage failed\n",
1952 mmc_hostname(mmc));
1953 return -EIO;
1954 }
1955 }
1956 return 0;
1957 default:
1958 /* No signal voltage switch required */
1959 return 0;
1960 }
1961 }
1962 EXPORT_SYMBOL_GPL(sdhci_start_signal_voltage_switch);
1963
1964 static int sdhci_card_busy(struct mmc_host *mmc)
1965 {
1966 struct sdhci_host *host = mmc_priv(mmc);
1967 u32 present_state;
1968
1969 /* Check whether DAT[0] is 0 */
1970 present_state = sdhci_readl(host, SDHCI_PRESENT_STATE);
1971
1972 return !(present_state & SDHCI_DATA_0_LVL_MASK);
1973 }
1974
1975 static int sdhci_prepare_hs400_tuning(struct mmc_host *mmc, struct mmc_ios *ios)
1976 {
1977 struct sdhci_host *host = mmc_priv(mmc);
1978 unsigned long flags;
1979
1980 spin_lock_irqsave(&host->lock, flags);
1981 host->flags |= SDHCI_HS400_TUNING;
1982 spin_unlock_irqrestore(&host->lock, flags);
1983
1984 return 0;
1985 }
1986
1987 static void sdhci_start_tuning(struct sdhci_host *host)
1988 {
1989 u16 ctrl;
1990
1991 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1992 ctrl |= SDHCI_CTRL_EXEC_TUNING;
1993 if (host->quirks2 & SDHCI_QUIRK2_TUNING_WORK_AROUND)
1994 ctrl |= SDHCI_CTRL_TUNED_CLK;
1995 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1996
1997 /*
1998 * As per the Host Controller spec v3.00, tuning command
1999 * generates Buffer Read Ready interrupt, so enable that.
2000 *
2001 * Note: The spec clearly says that when tuning sequence
2002 * is being performed, the controller does not generate
2003 * interrupts other than Buffer Read Ready interrupt. But
2004 * to make sure we don't hit a controller bug, we _only_
2005 * enable Buffer Read Ready interrupt here.
2006 */
2007 sdhci_writel(host, SDHCI_INT_DATA_AVAIL, SDHCI_INT_ENABLE);
2008 sdhci_writel(host, SDHCI_INT_DATA_AVAIL, SDHCI_SIGNAL_ENABLE);
2009 }
2010
2011 static void sdhci_end_tuning(struct sdhci_host *host)
2012 {
2013 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
2014 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
2015 }
2016
2017 static void sdhci_reset_tuning(struct sdhci_host *host)
2018 {
2019 u16 ctrl;
2020
2021 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2022 ctrl &= ~SDHCI_CTRL_TUNED_CLK;
2023 ctrl &= ~SDHCI_CTRL_EXEC_TUNING;
2024 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2025 }
2026
2027 static void sdhci_abort_tuning(struct sdhci_host *host, u32 opcode)
2028 {
2029 sdhci_reset_tuning(host);
2030
2031 sdhci_do_reset(host, SDHCI_RESET_CMD);
2032 sdhci_do_reset(host, SDHCI_RESET_DATA);
2033
2034 sdhci_end_tuning(host);
2035
2036 mmc_abort_tuning(host->mmc, opcode);
2037 }
2038
2039 /*
2040 * We use sdhci_send_tuning() because mmc_send_tuning() is not a good fit. SDHCI
2041 * tuning command does not have a data payload (or rather the hardware does it
2042 * automatically) so mmc_send_tuning() will return -EIO. Also the tuning command
2043 * interrupt setup is different to other commands and there is no timeout
2044 * interrupt so special handling is needed.
2045 */
2046 static void sdhci_send_tuning(struct sdhci_host *host, u32 opcode)
2047 {
2048 struct mmc_host *mmc = host->mmc;
2049 struct mmc_command cmd = {};
2050 struct mmc_request mrq = {};
2051 unsigned long flags;
2052 u32 b = host->sdma_boundary;
2053
2054 spin_lock_irqsave(&host->lock, flags);
2055
2056 cmd.opcode = opcode;
2057 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
2058 cmd.mrq = &mrq;
2059
2060 mrq.cmd = &cmd;
2061 /*
2062 * In response to CMD19, the card sends 64 bytes of tuning
2063 * block to the Host Controller. So we set the block size
2064 * to 64 here.
2065 */
2066 if (cmd.opcode == MMC_SEND_TUNING_BLOCK_HS200 &&
2067 mmc->ios.bus_width == MMC_BUS_WIDTH_8)
2068 sdhci_writew(host, SDHCI_MAKE_BLKSZ(b, 128), SDHCI_BLOCK_SIZE);
2069 else
2070 sdhci_writew(host, SDHCI_MAKE_BLKSZ(b, 64), SDHCI_BLOCK_SIZE);
2071
2072 /*
2073 * The tuning block is sent by the card to the host controller.
2074 * So we set the TRNS_READ bit in the Transfer Mode register.
2075 * This also takes care of setting DMA Enable and Multi Block
2076 * Select in the same register to 0.
2077 */
2078 sdhci_writew(host, SDHCI_TRNS_READ, SDHCI_TRANSFER_MODE);
2079
2080 sdhci_send_command(host, &cmd);
2081
2082 host->cmd = NULL;
2083
2084 sdhci_del_timer(host, &mrq);
2085
2086 host->tuning_done = 0;
2087
2088 mmiowb();
2089 spin_unlock_irqrestore(&host->lock, flags);
2090
2091 /* Wait for Buffer Read Ready interrupt */
2092 wait_event_timeout(host->buf_ready_int, (host->tuning_done == 1),
2093 msecs_to_jiffies(50));
2094
2095 }
2096
2097 static void __sdhci_execute_tuning(struct sdhci_host *host, u32 opcode)
2098 {
2099 int i;
2100
2101 /*
2102 * Issue opcode repeatedly till Execute Tuning is set to 0 or the number
2103 * of loops reaches 40 times.
2104 */
2105 for (i = 0; i < MAX_TUNING_LOOP; i++) {
2106 u16 ctrl;
2107
2108 sdhci_send_tuning(host, opcode);
2109
2110 if (!host->tuning_done) {
2111 pr_info("%s: Tuning timeout, falling back to fixed sampling clock\n",
2112 mmc_hostname(host->mmc));
2113 sdhci_abort_tuning(host, opcode);
2114 return;
2115 }
2116
2117 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2118 if (!(ctrl & SDHCI_CTRL_EXEC_TUNING)) {
2119 if (ctrl & SDHCI_CTRL_TUNED_CLK)
2120 return; /* Success! */
2121 break;
2122 }
2123
2124 /* Spec does not require a delay between tuning cycles */
2125 if (host->tuning_delay > 0)
2126 mdelay(host->tuning_delay);
2127 }
2128
2129 pr_info("%s: Tuning failed, falling back to fixed sampling clock\n",
2130 mmc_hostname(host->mmc));
2131 sdhci_reset_tuning(host);
2132 }
2133
2134 int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
2135 {
2136 struct sdhci_host *host = mmc_priv(mmc);
2137 int err = 0;
2138 unsigned int tuning_count = 0;
2139 bool hs400_tuning;
2140
2141 hs400_tuning = host->flags & SDHCI_HS400_TUNING;
2142
2143 if (host->tuning_mode == SDHCI_TUNING_MODE_1)
2144 tuning_count = host->tuning_count;
2145
2146 /*
2147 * The Host Controller needs tuning in case of SDR104 and DDR50
2148 * mode, and for SDR50 mode when Use Tuning for SDR50 is set in
2149 * the Capabilities register.
2150 * If the Host Controller supports the HS200 mode then the
2151 * tuning function has to be executed.
2152 */
2153 switch (host->timing) {
2154 /* HS400 tuning is done in HS200 mode */
2155 case MMC_TIMING_MMC_HS400:
2156 err = -EINVAL;
2157 goto out;
2158
2159 case MMC_TIMING_MMC_HS200:
2160 /*
2161 * Periodic re-tuning for HS400 is not expected to be needed, so
2162 * disable it here.
2163 */
2164 if (hs400_tuning)
2165 tuning_count = 0;
2166 break;
2167
2168 case MMC_TIMING_UHS_SDR104:
2169 case MMC_TIMING_UHS_DDR50:
2170 break;
2171
2172 case MMC_TIMING_UHS_SDR50:
2173 if (host->flags & SDHCI_SDR50_NEEDS_TUNING)
2174 break;
2175 /* FALLTHROUGH */
2176
2177 default:
2178 goto out;
2179 }
2180
2181 if (host->ops->platform_execute_tuning) {
2182 err = host->ops->platform_execute_tuning(host, opcode);
2183 goto out;
2184 }
2185
2186 host->mmc->retune_period = tuning_count;
2187
2188 if (host->tuning_delay < 0)
2189 host->tuning_delay = opcode == MMC_SEND_TUNING_BLOCK;
2190
2191 sdhci_start_tuning(host);
2192
2193 __sdhci_execute_tuning(host, opcode);
2194
2195 sdhci_end_tuning(host);
2196 out:
2197 host->flags &= ~SDHCI_HS400_TUNING;
2198
2199 return err;
2200 }
2201 EXPORT_SYMBOL_GPL(sdhci_execute_tuning);
2202
2203 static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable)
2204 {
2205 /* Host Controller v3.00 defines preset value registers */
2206 if (host->version < SDHCI_SPEC_300)
2207 return;
2208
2209 /*
2210 * We only enable or disable Preset Value if they are not already
2211 * enabled or disabled respectively. Otherwise, we bail out.
2212 */
2213 if (host->preset_enabled != enable) {
2214 u16 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2215
2216 if (enable)
2217 ctrl |= SDHCI_CTRL_PRESET_VAL_ENABLE;
2218 else
2219 ctrl &= ~SDHCI_CTRL_PRESET_VAL_ENABLE;
2220
2221 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2222
2223 if (enable)
2224 host->flags |= SDHCI_PV_ENABLED;
2225 else
2226 host->flags &= ~SDHCI_PV_ENABLED;
2227
2228 host->preset_enabled = enable;
2229 }
2230 }
2231
2232 static void sdhci_post_req(struct mmc_host *mmc, struct mmc_request *mrq,
2233 int err)
2234 {
2235 struct sdhci_host *host = mmc_priv(mmc);
2236 struct mmc_data *data = mrq->data;
2237
2238 if (data->host_cookie != COOKIE_UNMAPPED)
2239 dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
2240 mmc_get_dma_dir(data));
2241
2242 data->host_cookie = COOKIE_UNMAPPED;
2243 }
2244
2245 static void sdhci_pre_req(struct mmc_host *mmc, struct mmc_request *mrq)
2246 {
2247 struct sdhci_host *host = mmc_priv(mmc);
2248
2249 mrq->data->host_cookie = COOKIE_UNMAPPED;
2250
2251 if (host->flags & SDHCI_REQ_USE_DMA)
2252 sdhci_pre_dma_transfer(host, mrq->data, COOKIE_PRE_MAPPED);
2253 }
2254
2255 static inline bool sdhci_has_requests(struct sdhci_host *host)
2256 {
2257 return host->cmd || host->data_cmd;
2258 }
2259
2260 static void sdhci_error_out_mrqs(struct sdhci_host *host, int err)
2261 {
2262 if (host->data_cmd) {
2263 host->data_cmd->error = err;
2264 sdhci_finish_mrq(host, host->data_cmd->mrq);
2265 }
2266
2267 if (host->cmd) {
2268 host->cmd->error = err;
2269 sdhci_finish_mrq(host, host->cmd->mrq);
2270 }
2271 }
2272
2273 static void sdhci_card_event(struct mmc_host *mmc)
2274 {
2275 struct sdhci_host *host = mmc_priv(mmc);
2276 unsigned long flags;
2277 int present;
2278
2279 /* First check if client has provided their own card event */
2280 if (host->ops->card_event)
2281 host->ops->card_event(host);
2282
2283 present = mmc->ops->get_cd(mmc);
2284
2285 spin_lock_irqsave(&host->lock, flags);
2286
2287 /* Check sdhci_has_requests() first in case we are runtime suspended */
2288 if (sdhci_has_requests(host) && !present) {
2289 pr_err("%s: Card removed during transfer!\n",
2290 mmc_hostname(host->mmc));
2291 pr_err("%s: Resetting controller.\n",
2292 mmc_hostname(host->mmc));
2293
2294 sdhci_do_reset(host, SDHCI_RESET_CMD);
2295 sdhci_do_reset(host, SDHCI_RESET_DATA);
2296
2297 sdhci_error_out_mrqs(host, -ENOMEDIUM);
2298 }
2299
2300 spin_unlock_irqrestore(&host->lock, flags);
2301 }
2302
2303 static const struct mmc_host_ops sdhci_ops = {
2304 .request = sdhci_request,
2305 .post_req = sdhci_post_req,
2306 .pre_req = sdhci_pre_req,
2307 .set_ios = sdhci_set_ios,
2308 .get_cd = sdhci_get_cd,
2309 .get_ro = sdhci_get_ro,
2310 .hw_reset = sdhci_hw_reset,
2311 .enable_sdio_irq = sdhci_enable_sdio_irq,
2312 .start_signal_voltage_switch = sdhci_start_signal_voltage_switch,
2313 .prepare_hs400_tuning = sdhci_prepare_hs400_tuning,
2314 .execute_tuning = sdhci_execute_tuning,
2315 .card_event = sdhci_card_event,
2316 .card_busy = sdhci_card_busy,
2317 };
2318
2319 /*****************************************************************************\
2320 * *
2321 * Tasklets *
2322 * *
2323 \*****************************************************************************/
2324
2325 static bool sdhci_request_done(struct sdhci_host *host)
2326 {
2327 unsigned long flags;
2328 struct mmc_request *mrq;
2329 int i;
2330
2331 spin_lock_irqsave(&host->lock, flags);
2332
2333 for (i = 0; i < SDHCI_MAX_MRQS; i++) {
2334 mrq = host->mrqs_done[i];
2335 if (mrq)
2336 break;
2337 }
2338
2339 if (!mrq) {
2340 spin_unlock_irqrestore(&host->lock, flags);
2341 return true;
2342 }
2343
2344 sdhci_del_timer(host, mrq);
2345
2346 /*
2347 * Always unmap the data buffers if they were mapped by
2348 * sdhci_prepare_data() whenever we finish with a request.
2349 * This avoids leaking DMA mappings on error.
2350 */
2351 if (host->flags & SDHCI_REQ_USE_DMA) {
2352 struct mmc_data *data = mrq->data;
2353
2354 if (data && data->host_cookie == COOKIE_MAPPED) {
2355 dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
2356 mmc_get_dma_dir(data));
2357 data->host_cookie = COOKIE_UNMAPPED;
2358 }
2359 }
2360
2361 /*
2362 * The controller needs a reset of internal state machines
2363 * upon error conditions.
2364 */
2365 if (sdhci_needs_reset(host, mrq)) {
2366 /*
2367 * Do not finish until command and data lines are available for
2368 * reset. Note there can only be one other mrq, so it cannot
2369 * also be in mrqs_done, otherwise host->cmd and host->data_cmd
2370 * would both be null.
2371 */
2372 if (host->cmd || host->data_cmd) {
2373 spin_unlock_irqrestore(&host->lock, flags);
2374 return true;
2375 }
2376
2377 /* Some controllers need this kick or reset won't work here */
2378 if (host->quirks & SDHCI_QUIRK_CLOCK_BEFORE_RESET)
2379 /* This is to force an update */
2380 host->ops->set_clock(host, host->clock);
2381
2382 /* Spec says we should do both at the same time, but Ricoh
2383 controllers do not like that. */
2384 sdhci_do_reset(host, SDHCI_RESET_CMD);
2385 sdhci_do_reset(host, SDHCI_RESET_DATA);
2386
2387 host->pending_reset = false;
2388 }
2389
2390 if (!sdhci_has_requests(host))
2391 sdhci_led_deactivate(host);
2392
2393 host->mrqs_done[i] = NULL;
2394
2395 mmiowb();
2396 spin_unlock_irqrestore(&host->lock, flags);
2397
2398 mmc_request_done(host->mmc, mrq);
2399
2400 return false;
2401 }
2402
2403 static void sdhci_tasklet_finish(unsigned long param)
2404 {
2405 struct sdhci_host *host = (struct sdhci_host *)param;
2406
2407 while (!sdhci_request_done(host))
2408 ;
2409 }
2410
2411 static void sdhci_timeout_timer(struct timer_list *t)
2412 {
2413 struct sdhci_host *host;
2414 unsigned long flags;
2415
2416 host = from_timer(host, t, timer);
2417
2418 spin_lock_irqsave(&host->lock, flags);
2419
2420 if (host->cmd && !sdhci_data_line_cmd(host->cmd)) {
2421 pr_err("%s: Timeout waiting for hardware cmd interrupt.\n",
2422 mmc_hostname(host->mmc));
2423 sdhci_dumpregs(host);
2424
2425 host->cmd->error = -ETIMEDOUT;
2426 sdhci_finish_mrq(host, host->cmd->mrq);
2427 }
2428
2429 mmiowb();
2430 spin_unlock_irqrestore(&host->lock, flags);
2431 }
2432
2433 static void sdhci_timeout_data_timer(struct timer_list *t)
2434 {
2435 struct sdhci_host *host;
2436 unsigned long flags;
2437
2438 host = from_timer(host, t, data_timer);
2439
2440 spin_lock_irqsave(&host->lock, flags);
2441
2442 if (host->data || host->data_cmd ||
2443 (host->cmd && sdhci_data_line_cmd(host->cmd))) {
2444 pr_err("%s: Timeout waiting for hardware interrupt.\n",
2445 mmc_hostname(host->mmc));
2446 sdhci_dumpregs(host);
2447
2448 if (host->data) {
2449 host->data->error = -ETIMEDOUT;
2450 sdhci_finish_data(host);
2451 } else if (host->data_cmd) {
2452 host->data_cmd->error = -ETIMEDOUT;
2453 sdhci_finish_mrq(host, host->data_cmd->mrq);
2454 } else {
2455 host->cmd->error = -ETIMEDOUT;
2456 sdhci_finish_mrq(host, host->cmd->mrq);
2457 }
2458 }
2459
2460 mmiowb();
2461 spin_unlock_irqrestore(&host->lock, flags);
2462 }
2463
2464 /*****************************************************************************\
2465 * *
2466 * Interrupt handling *
2467 * *
2468 \*****************************************************************************/
2469
2470 static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask)
2471 {
2472 if (!host->cmd) {
2473 /*
2474 * SDHCI recovers from errors by resetting the cmd and data
2475 * circuits. Until that is done, there very well might be more
2476 * interrupts, so ignore them in that case.
2477 */
2478 if (host->pending_reset)
2479 return;
2480 pr_err("%s: Got command interrupt 0x%08x even though no command operation was in progress.\n",
2481 mmc_hostname(host->mmc), (unsigned)intmask);
2482 sdhci_dumpregs(host);
2483 return;
2484 }
2485
2486 if (intmask & (SDHCI_INT_TIMEOUT | SDHCI_INT_CRC |
2487 SDHCI_INT_END_BIT | SDHCI_INT_INDEX)) {
2488 if (intmask & SDHCI_INT_TIMEOUT)
2489 host->cmd->error = -ETIMEDOUT;
2490 else
2491 host->cmd->error = -EILSEQ;
2492
2493 /*
2494 * If this command initiates a data phase and a response
2495 * CRC error is signalled, the card can start transferring
2496 * data - the card may have received the command without
2497 * error. We must not terminate the mmc_request early.
2498 *
2499 * If the card did not receive the command or returned an
2500 * error which prevented it sending data, the data phase
2501 * will time out.
2502 */
2503 if (host->cmd->data &&
2504 (intmask & (SDHCI_INT_CRC | SDHCI_INT_TIMEOUT)) ==
2505 SDHCI_INT_CRC) {
2506 host->cmd = NULL;
2507 return;
2508 }
2509
2510 sdhci_finish_mrq(host, host->cmd->mrq);
2511 return;
2512 }
2513
2514 if (intmask & SDHCI_INT_RESPONSE)
2515 sdhci_finish_command(host);
2516 }
2517
2518 static void sdhci_adma_show_error(struct sdhci_host *host)
2519 {
2520 void *desc = host->adma_table;
2521
2522 sdhci_dumpregs(host);
2523
2524 while (true) {
2525 struct sdhci_adma2_64_desc *dma_desc = desc;
2526
2527 if (host->flags & SDHCI_USE_64_BIT_DMA)
2528 DBG("%p: DMA 0x%08x%08x, LEN 0x%04x, Attr=0x%02x\n",
2529 desc, le32_to_cpu(dma_desc->addr_hi),
2530 le32_to_cpu(dma_desc->addr_lo),
2531 le16_to_cpu(dma_desc->len),
2532 le16_to_cpu(dma_desc->cmd));
2533 else
2534 DBG("%p: DMA 0x%08x, LEN 0x%04x, Attr=0x%02x\n",
2535 desc, le32_to_cpu(dma_desc->addr_lo),
2536 le16_to_cpu(dma_desc->len),
2537 le16_to_cpu(dma_desc->cmd));
2538
2539 desc += host->desc_sz;
2540
2541 if (dma_desc->cmd & cpu_to_le16(ADMA2_END))
2542 break;
2543 }
2544 }
2545
2546 static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
2547 {
2548 u32 command;
2549
2550 /* CMD19 generates _only_ Buffer Read Ready interrupt */
2551 if (intmask & SDHCI_INT_DATA_AVAIL) {
2552 command = SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND));
2553 if (command == MMC_SEND_TUNING_BLOCK ||
2554 command == MMC_SEND_TUNING_BLOCK_HS200) {
2555 host->tuning_done = 1;
2556 wake_up(&host->buf_ready_int);
2557 return;
2558 }
2559 }
2560
2561 if (!host->data) {
2562 struct mmc_command *data_cmd = host->data_cmd;
2563
2564 /*
2565 * The "data complete" interrupt is also used to
2566 * indicate that a busy state has ended. See comment
2567 * above in sdhci_cmd_irq().
2568 */
2569 if (data_cmd && (data_cmd->flags & MMC_RSP_BUSY)) {
2570 if (intmask & SDHCI_INT_DATA_TIMEOUT) {
2571 host->data_cmd = NULL;
2572 data_cmd->error = -ETIMEDOUT;
2573 sdhci_finish_mrq(host, data_cmd->mrq);
2574 return;
2575 }
2576 if (intmask & SDHCI_INT_DATA_END) {
2577 host->data_cmd = NULL;
2578 /*
2579 * Some cards handle busy-end interrupt
2580 * before the command completed, so make
2581 * sure we do things in the proper order.
2582 */
2583 if (host->cmd == data_cmd)
2584 return;
2585
2586 sdhci_finish_mrq(host, data_cmd->mrq);
2587 return;
2588 }
2589 }
2590
2591 /*
2592 * SDHCI recovers from errors by resetting the cmd and data
2593 * circuits. Until that is done, there very well might be more
2594 * interrupts, so ignore them in that case.
2595 */
2596 if (host->pending_reset)
2597 return;
2598
2599 pr_err("%s: Got data interrupt 0x%08x even though no data operation was in progress.\n",
2600 mmc_hostname(host->mmc), (unsigned)intmask);
2601 sdhci_dumpregs(host);
2602
2603 return;
2604 }
2605
2606 if (intmask & SDHCI_INT_DATA_TIMEOUT)
2607 host->data->error = -ETIMEDOUT;
2608 else if (intmask & SDHCI_INT_DATA_END_BIT)
2609 host->data->error = -EILSEQ;
2610 else if ((intmask & SDHCI_INT_DATA_CRC) &&
2611 SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND))
2612 != MMC_BUS_TEST_R)
2613 host->data->error = -EILSEQ;
2614 else if (intmask & SDHCI_INT_ADMA_ERROR) {
2615 pr_err("%s: ADMA error\n", mmc_hostname(host->mmc));
2616 sdhci_adma_show_error(host);
2617 host->data->error = -EIO;
2618 if (host->ops->adma_workaround)
2619 host->ops->adma_workaround(host, intmask);
2620 }
2621
2622 if (host->data->error)
2623 sdhci_finish_data(host);
2624 else {
2625 if (intmask & (SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL))
2626 sdhci_transfer_pio(host);
2627
2628 /*
2629 * We currently don't do anything fancy with DMA
2630 * boundaries, but as we can't disable the feature
2631 * we need to at least restart the transfer.
2632 *
2633 * According to the spec sdhci_readl(host, SDHCI_DMA_ADDRESS)
2634 * should return a valid address to continue from, but as
2635 * some controllers are faulty, don't trust them.
2636 */
2637 if (intmask & SDHCI_INT_DMA_END) {
2638 u32 dmastart, dmanow;
2639 dmastart = sg_dma_address(host->data->sg);
2640 dmanow = dmastart + host->data->bytes_xfered;
2641 /*
2642 * Force update to the next DMA block boundary.
2643 */
2644 dmanow = (dmanow &
2645 ~(SDHCI_DEFAULT_BOUNDARY_SIZE - 1)) +
2646 SDHCI_DEFAULT_BOUNDARY_SIZE;
2647 host->data->bytes_xfered = dmanow - dmastart;
2648 DBG("DMA base 0x%08x, transferred 0x%06x bytes, next 0x%08x\n",
2649 dmastart, host->data->bytes_xfered, dmanow);
2650 sdhci_writel(host, dmanow, SDHCI_DMA_ADDRESS);
2651 }
2652
2653 if (intmask & SDHCI_INT_DATA_END) {
2654 if (host->cmd == host->data_cmd) {
2655 /*
2656 * Data managed to finish before the
2657 * command completed. Make sure we do
2658 * things in the proper order.
2659 */
2660 host->data_early = 1;
2661 } else {
2662 sdhci_finish_data(host);
2663 }
2664 }
2665 }
2666 }
2667
2668 static irqreturn_t sdhci_irq(int irq, void *dev_id)
2669 {
2670 irqreturn_t result = IRQ_NONE;
2671 struct sdhci_host *host = dev_id;
2672 u32 intmask, mask, unexpected = 0;
2673 int max_loops = 16;
2674
2675 spin_lock(&host->lock);
2676
2677 if (host->runtime_suspended && !sdhci_sdio_irq_enabled(host)) {
2678 spin_unlock(&host->lock);
2679 return IRQ_NONE;
2680 }
2681
2682 intmask = sdhci_readl(host, SDHCI_INT_STATUS);
2683 if (!intmask || intmask == 0xffffffff) {
2684 result = IRQ_NONE;
2685 goto out;
2686 }
2687
2688 do {
2689 DBG("IRQ status 0x%08x\n", intmask);
2690
2691 if (host->ops->irq) {
2692 intmask = host->ops->irq(host, intmask);
2693 if (!intmask)
2694 goto cont;
2695 }
2696
2697 /* Clear selected interrupts. */
2698 mask = intmask & (SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK |
2699 SDHCI_INT_BUS_POWER);
2700 sdhci_writel(host, mask, SDHCI_INT_STATUS);
2701
2702 if (intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
2703 u32 present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
2704 SDHCI_CARD_PRESENT;
2705
2706 /*
2707 * There is a observation on i.mx esdhc. INSERT
2708 * bit will be immediately set again when it gets
2709 * cleared, if a card is inserted. We have to mask
2710 * the irq to prevent interrupt storm which will
2711 * freeze the system. And the REMOVE gets the
2712 * same situation.
2713 *
2714 * More testing are needed here to ensure it works
2715 * for other platforms though.
2716 */
2717 host->ier &= ~(SDHCI_INT_CARD_INSERT |
2718 SDHCI_INT_CARD_REMOVE);
2719 host->ier |= present ? SDHCI_INT_CARD_REMOVE :
2720 SDHCI_INT_CARD_INSERT;
2721 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
2722 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
2723
2724 sdhci_writel(host, intmask & (SDHCI_INT_CARD_INSERT |
2725 SDHCI_INT_CARD_REMOVE), SDHCI_INT_STATUS);
2726
2727 host->thread_isr |= intmask & (SDHCI_INT_CARD_INSERT |
2728 SDHCI_INT_CARD_REMOVE);
2729 result = IRQ_WAKE_THREAD;
2730 }
2731
2732 if (intmask & SDHCI_INT_CMD_MASK)
2733 sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK);
2734
2735 if (intmask & SDHCI_INT_DATA_MASK)
2736 sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK);
2737
2738 if (intmask & SDHCI_INT_BUS_POWER)
2739 pr_err("%s: Card is consuming too much power!\n",
2740 mmc_hostname(host->mmc));
2741
2742 if (intmask & SDHCI_INT_RETUNE)
2743 mmc_retune_needed(host->mmc);
2744
2745 if ((intmask & SDHCI_INT_CARD_INT) &&
2746 (host->ier & SDHCI_INT_CARD_INT)) {
2747 sdhci_enable_sdio_irq_nolock(host, false);
2748 host->thread_isr |= SDHCI_INT_CARD_INT;
2749 result = IRQ_WAKE_THREAD;
2750 }
2751
2752 intmask &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE |
2753 SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK |
2754 SDHCI_INT_ERROR | SDHCI_INT_BUS_POWER |
2755 SDHCI_INT_RETUNE | SDHCI_INT_CARD_INT);
2756
2757 if (intmask) {
2758 unexpected |= intmask;
2759 sdhci_writel(host, intmask, SDHCI_INT_STATUS);
2760 }
2761 cont:
2762 if (result == IRQ_NONE)
2763 result = IRQ_HANDLED;
2764
2765 intmask = sdhci_readl(host, SDHCI_INT_STATUS);
2766 } while (intmask && --max_loops);
2767 out:
2768 spin_unlock(&host->lock);
2769
2770 if (unexpected) {
2771 pr_err("%s: Unexpected interrupt 0x%08x.\n",
2772 mmc_hostname(host->mmc), unexpected);
2773 sdhci_dumpregs(host);
2774 }
2775
2776 return result;
2777 }
2778
2779 static irqreturn_t sdhci_thread_irq(int irq, void *dev_id)
2780 {
2781 struct sdhci_host *host = dev_id;
2782 unsigned long flags;
2783 u32 isr;
2784
2785 spin_lock_irqsave(&host->lock, flags);
2786 isr = host->thread_isr;
2787 host->thread_isr = 0;
2788 spin_unlock_irqrestore(&host->lock, flags);
2789
2790 if (isr & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
2791 struct mmc_host *mmc = host->mmc;
2792
2793 mmc->ops->card_event(mmc);
2794 mmc_detect_change(mmc, msecs_to_jiffies(200));
2795 }
2796
2797 if (isr & SDHCI_INT_CARD_INT) {
2798 sdio_run_irqs(host->mmc);
2799
2800 spin_lock_irqsave(&host->lock, flags);
2801 if (host->flags & SDHCI_SDIO_IRQ_ENABLED)
2802 sdhci_enable_sdio_irq_nolock(host, true);
2803 spin_unlock_irqrestore(&host->lock, flags);
2804 }
2805
2806 return isr ? IRQ_HANDLED : IRQ_NONE;
2807 }
2808
2809 /*****************************************************************************\
2810 * *
2811 * Suspend/resume *
2812 * *
2813 \*****************************************************************************/
2814
2815 #ifdef CONFIG_PM
2816 /*
2817 * To enable wakeup events, the corresponding events have to be enabled in
2818 * the Interrupt Status Enable register too. See 'Table 1-6: Wakeup Signal
2819 * Table' in the SD Host Controller Standard Specification.
2820 * It is useless to restore SDHCI_INT_ENABLE state in
2821 * sdhci_disable_irq_wakeups() since it will be set by
2822 * sdhci_enable_card_detection() or sdhci_init().
2823 */
2824 void sdhci_enable_irq_wakeups(struct sdhci_host *host)
2825 {
2826 u8 val;
2827 u8 mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE
2828 | SDHCI_WAKE_ON_INT;
2829 u32 irq_val = SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE |
2830 SDHCI_INT_CARD_INT;
2831
2832 val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
2833 val |= mask ;
2834 /* Avoid fake wake up */
2835 if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) {
2836 val &= ~(SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE);
2837 irq_val &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE);
2838 }
2839 sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
2840 sdhci_writel(host, irq_val, SDHCI_INT_ENABLE);
2841 }
2842 EXPORT_SYMBOL_GPL(sdhci_enable_irq_wakeups);
2843
2844 static void sdhci_disable_irq_wakeups(struct sdhci_host *host)
2845 {
2846 u8 val;
2847 u8 mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE
2848 | SDHCI_WAKE_ON_INT;
2849
2850 val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
2851 val &= ~mask;
2852 sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
2853 }
2854
2855 int sdhci_suspend_host(struct sdhci_host *host)
2856 {
2857 sdhci_disable_card_detection(host);
2858
2859 mmc_retune_timer_stop(host->mmc);
2860
2861 if (!device_may_wakeup(mmc_dev(host->mmc))) {
2862 host->ier = 0;
2863 sdhci_writel(host, 0, SDHCI_INT_ENABLE);
2864 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
2865 free_irq(host->irq, host);
2866 } else {
2867 sdhci_enable_irq_wakeups(host);
2868 enable_irq_wake(host->irq);
2869 }
2870 return 0;
2871 }
2872
2873 EXPORT_SYMBOL_GPL(sdhci_suspend_host);
2874
2875 int sdhci_resume_host(struct sdhci_host *host)
2876 {
2877 struct mmc_host *mmc = host->mmc;
2878 int ret = 0;
2879
2880 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
2881 if (host->ops->enable_dma)
2882 host->ops->enable_dma(host);
2883 }
2884
2885 if ((host->mmc->pm_flags & MMC_PM_KEEP_POWER) &&
2886 (host->quirks2 & SDHCI_QUIRK2_HOST_OFF_CARD_ON)) {
2887 /* Card keeps power but host controller does not */
2888 sdhci_init(host, 0);
2889 host->pwr = 0;
2890 host->clock = 0;
2891 mmc->ops->set_ios(mmc, &mmc->ios);
2892 } else {
2893 sdhci_init(host, (host->mmc->pm_flags & MMC_PM_KEEP_POWER));
2894 mmiowb();
2895 }
2896
2897 if (!device_may_wakeup(mmc_dev(host->mmc))) {
2898 ret = request_threaded_irq(host->irq, sdhci_irq,
2899 sdhci_thread_irq, IRQF_SHARED,
2900 mmc_hostname(host->mmc), host);
2901 if (ret)
2902 return ret;
2903 } else {
2904 sdhci_disable_irq_wakeups(host);
2905 disable_irq_wake(host->irq);
2906 }
2907
2908 sdhci_enable_card_detection(host);
2909
2910 return ret;
2911 }
2912
2913 EXPORT_SYMBOL_GPL(sdhci_resume_host);
2914
2915 int sdhci_runtime_suspend_host(struct sdhci_host *host)
2916 {
2917 unsigned long flags;
2918
2919 mmc_retune_timer_stop(host->mmc);
2920
2921 spin_lock_irqsave(&host->lock, flags);
2922 host->ier &= SDHCI_INT_CARD_INT;
2923 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
2924 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
2925 spin_unlock_irqrestore(&host->lock, flags);
2926
2927 synchronize_hardirq(host->irq);
2928
2929 spin_lock_irqsave(&host->lock, flags);
2930 host->runtime_suspended = true;
2931 spin_unlock_irqrestore(&host->lock, flags);
2932
2933 return 0;
2934 }
2935 EXPORT_SYMBOL_GPL(sdhci_runtime_suspend_host);
2936
2937 int sdhci_runtime_resume_host(struct sdhci_host *host)
2938 {
2939 struct mmc_host *mmc = host->mmc;
2940 unsigned long flags;
2941 int host_flags = host->flags;
2942
2943 if (host_flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
2944 if (host->ops->enable_dma)
2945 host->ops->enable_dma(host);
2946 }
2947
2948 sdhci_init(host, 0);
2949
2950 if (mmc->ios.power_mode != MMC_POWER_UNDEFINED &&
2951 mmc->ios.power_mode != MMC_POWER_OFF) {
2952 /* Force clock and power re-program */
2953 host->pwr = 0;
2954 host->clock = 0;
2955 mmc->ops->start_signal_voltage_switch(mmc, &mmc->ios);
2956 mmc->ops->set_ios(mmc, &mmc->ios);
2957
2958 if ((host_flags & SDHCI_PV_ENABLED) &&
2959 !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN)) {
2960 spin_lock_irqsave(&host->lock, flags);
2961 sdhci_enable_preset_value(host, true);
2962 spin_unlock_irqrestore(&host->lock, flags);
2963 }
2964
2965 if ((mmc->caps2 & MMC_CAP2_HS400_ES) &&
2966 mmc->ops->hs400_enhanced_strobe)
2967 mmc->ops->hs400_enhanced_strobe(mmc, &mmc->ios);
2968 }
2969
2970 spin_lock_irqsave(&host->lock, flags);
2971
2972 host->runtime_suspended = false;
2973
2974 /* Enable SDIO IRQ */
2975 if (host->flags & SDHCI_SDIO_IRQ_ENABLED)
2976 sdhci_enable_sdio_irq_nolock(host, true);
2977
2978 /* Enable Card Detection */
2979 sdhci_enable_card_detection(host);
2980
2981 spin_unlock_irqrestore(&host->lock, flags);
2982
2983 return 0;
2984 }
2985 EXPORT_SYMBOL_GPL(sdhci_runtime_resume_host);
2986
2987 #endif /* CONFIG_PM */
2988
2989 /*****************************************************************************\
2990 * *
2991 * Command Queue Engine (CQE) helpers *
2992 * *
2993 \*****************************************************************************/
2994
2995 void sdhci_cqe_enable(struct mmc_host *mmc)
2996 {
2997 struct sdhci_host *host = mmc_priv(mmc);
2998 unsigned long flags;
2999 u8 ctrl;
3000
3001 spin_lock_irqsave(&host->lock, flags);
3002
3003 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
3004 ctrl &= ~SDHCI_CTRL_DMA_MASK;
3005 if (host->flags & SDHCI_USE_64_BIT_DMA)
3006 ctrl |= SDHCI_CTRL_ADMA64;
3007 else
3008 ctrl |= SDHCI_CTRL_ADMA32;
3009 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
3010
3011 sdhci_writew(host, SDHCI_MAKE_BLKSZ(host->sdma_boundary, 512),
3012 SDHCI_BLOCK_SIZE);
3013
3014 /* Set maximum timeout */
3015 sdhci_writeb(host, 0xE, SDHCI_TIMEOUT_CONTROL);
3016
3017 host->ier = host->cqe_ier;
3018
3019 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
3020 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
3021
3022 host->cqe_on = true;
3023
3024 pr_debug("%s: sdhci: CQE on, IRQ mask %#x, IRQ status %#x\n",
3025 mmc_hostname(mmc), host->ier,
3026 sdhci_readl(host, SDHCI_INT_STATUS));
3027
3028 mmiowb();
3029 spin_unlock_irqrestore(&host->lock, flags);
3030 }
3031 EXPORT_SYMBOL_GPL(sdhci_cqe_enable);
3032
3033 void sdhci_cqe_disable(struct mmc_host *mmc, bool recovery)
3034 {
3035 struct sdhci_host *host = mmc_priv(mmc);
3036 unsigned long flags;
3037
3038 spin_lock_irqsave(&host->lock, flags);
3039
3040 sdhci_set_default_irqs(host);
3041
3042 host->cqe_on = false;
3043
3044 if (recovery) {
3045 sdhci_do_reset(host, SDHCI_RESET_CMD);
3046 sdhci_do_reset(host, SDHCI_RESET_DATA);
3047 }
3048
3049 pr_debug("%s: sdhci: CQE off, IRQ mask %#x, IRQ status %#x\n",
3050 mmc_hostname(mmc), host->ier,
3051 sdhci_readl(host, SDHCI_INT_STATUS));
3052
3053 mmiowb();
3054 spin_unlock_irqrestore(&host->lock, flags);
3055 }
3056 EXPORT_SYMBOL_GPL(sdhci_cqe_disable);
3057
3058 bool sdhci_cqe_irq(struct sdhci_host *host, u32 intmask, int *cmd_error,
3059 int *data_error)
3060 {
3061 u32 mask;
3062
3063 if (!host->cqe_on)
3064 return false;
3065
3066 if (intmask & (SDHCI_INT_INDEX | SDHCI_INT_END_BIT | SDHCI_INT_CRC))
3067 *cmd_error = -EILSEQ;
3068 else if (intmask & SDHCI_INT_TIMEOUT)
3069 *cmd_error = -ETIMEDOUT;
3070 else
3071 *cmd_error = 0;
3072
3073 if (intmask & (SDHCI_INT_DATA_END_BIT | SDHCI_INT_DATA_CRC))
3074 *data_error = -EILSEQ;
3075 else if (intmask & SDHCI_INT_DATA_TIMEOUT)
3076 *data_error = -ETIMEDOUT;
3077 else if (intmask & SDHCI_INT_ADMA_ERROR)
3078 *data_error = -EIO;
3079 else
3080 *data_error = 0;
3081
3082 /* Clear selected interrupts. */
3083 mask = intmask & host->cqe_ier;
3084 sdhci_writel(host, mask, SDHCI_INT_STATUS);
3085
3086 if (intmask & SDHCI_INT_BUS_POWER)
3087 pr_err("%s: Card is consuming too much power!\n",
3088 mmc_hostname(host->mmc));
3089
3090 intmask &= ~(host->cqe_ier | SDHCI_INT_ERROR);
3091 if (intmask) {
3092 sdhci_writel(host, intmask, SDHCI_INT_STATUS);
3093 pr_err("%s: CQE: Unexpected interrupt 0x%08x.\n",
3094 mmc_hostname(host->mmc), intmask);
3095 sdhci_dumpregs(host);
3096 }
3097
3098 return true;
3099 }
3100 EXPORT_SYMBOL_GPL(sdhci_cqe_irq);
3101
3102 /*****************************************************************************\
3103 * *
3104 * Device allocation/registration *
3105 * *
3106 \*****************************************************************************/
3107
3108 struct sdhci_host *sdhci_alloc_host(struct device *dev,
3109 size_t priv_size)
3110 {
3111 struct mmc_host *mmc;
3112 struct sdhci_host *host;
3113
3114 WARN_ON(dev == NULL);
3115
3116 mmc = mmc_alloc_host(sizeof(struct sdhci_host) + priv_size, dev);
3117 if (!mmc)
3118 return ERR_PTR(-ENOMEM);
3119
3120 host = mmc_priv(mmc);
3121 host->mmc = mmc;
3122 host->mmc_host_ops = sdhci_ops;
3123 mmc->ops = &host->mmc_host_ops;
3124
3125 host->flags = SDHCI_SIGNALING_330;
3126
3127 host->cqe_ier = SDHCI_CQE_INT_MASK;
3128 host->cqe_err_ier = SDHCI_CQE_INT_ERR_MASK;
3129
3130 host->tuning_delay = -1;
3131
3132 host->sdma_boundary = SDHCI_DEFAULT_BOUNDARY_ARG;
3133
3134 return host;
3135 }
3136
3137 EXPORT_SYMBOL_GPL(sdhci_alloc_host);
3138
3139 static int sdhci_set_dma_mask(struct sdhci_host *host)
3140 {
3141 struct mmc_host *mmc = host->mmc;
3142 struct device *dev = mmc_dev(mmc);
3143 int ret = -EINVAL;
3144
3145 if (host->quirks2 & SDHCI_QUIRK2_BROKEN_64_BIT_DMA)
3146 host->flags &= ~SDHCI_USE_64_BIT_DMA;
3147
3148 /* Try 64-bit mask if hardware is capable of it */
3149 if (host->flags & SDHCI_USE_64_BIT_DMA) {
3150 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
3151 if (ret) {
3152 pr_warn("%s: Failed to set 64-bit DMA mask.\n",
3153 mmc_hostname(mmc));
3154 host->flags &= ~SDHCI_USE_64_BIT_DMA;
3155 }
3156 }
3157
3158 /* 32-bit mask as default & fallback */
3159 if (ret) {
3160 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
3161 if (ret)
3162 pr_warn("%s: Failed to set 32-bit DMA mask.\n",
3163 mmc_hostname(mmc));
3164 }
3165
3166 return ret;
3167 }
3168
3169 void __sdhci_read_caps(struct sdhci_host *host, u16 *ver, u32 *caps, u32 *caps1)
3170 {
3171 u16 v;
3172 u64 dt_caps_mask = 0;
3173 u64 dt_caps = 0;
3174
3175 if (host->read_caps)
3176 return;
3177
3178 host->read_caps = true;
3179
3180 if (debug_quirks)
3181 host->quirks = debug_quirks;
3182
3183 if (debug_quirks2)
3184 host->quirks2 = debug_quirks2;
3185
3186 sdhci_do_reset(host, SDHCI_RESET_ALL);
3187
3188 of_property_read_u64(mmc_dev(host->mmc)->of_node,
3189 "sdhci-caps-mask", &dt_caps_mask);
3190 of_property_read_u64(mmc_dev(host->mmc)->of_node,
3191 "sdhci-caps", &dt_caps);
3192
3193 v = ver ? *ver : sdhci_readw(host, SDHCI_HOST_VERSION);
3194 host->version = (v & SDHCI_SPEC_VER_MASK) >> SDHCI_SPEC_VER_SHIFT;
3195
3196 if (host->quirks & SDHCI_QUIRK_MISSING_CAPS)
3197 return;
3198
3199 if (caps) {
3200 host->caps = *caps;
3201 } else {
3202 host->caps = sdhci_readl(host, SDHCI_CAPABILITIES);
3203 host->caps &= ~lower_32_bits(dt_caps_mask);
3204 host->caps |= lower_32_bits(dt_caps);
3205 }
3206
3207 if (host->version < SDHCI_SPEC_300)
3208 return;
3209
3210 if (caps1) {
3211 host->caps1 = *caps1;
3212 } else {
3213 host->caps1 = sdhci_readl(host, SDHCI_CAPABILITIES_1);
3214 host->caps1 &= ~upper_32_bits(dt_caps_mask);
3215 host->caps1 |= upper_32_bits(dt_caps);
3216 }
3217 }
3218 EXPORT_SYMBOL_GPL(__sdhci_read_caps);
3219
3220 int sdhci_setup_host(struct sdhci_host *host)
3221 {
3222 struct mmc_host *mmc;
3223 u32 max_current_caps;
3224 unsigned int ocr_avail;
3225 unsigned int override_timeout_clk;
3226 u32 max_clk;
3227 int ret;
3228
3229 WARN_ON(host == NULL);
3230 if (host == NULL)
3231 return -EINVAL;
3232
3233 mmc = host->mmc;
3234
3235 /*
3236 * If there are external regulators, get them. Note this must be done
3237 * early before resetting the host and reading the capabilities so that
3238 * the host can take the appropriate action if regulators are not
3239 * available.
3240 */
3241 ret = mmc_regulator_get_supply(mmc);
3242 if (ret)
3243 return ret;
3244
3245 DBG("Version: 0x%08x | Present: 0x%08x\n",
3246 sdhci_readw(host, SDHCI_HOST_VERSION),
3247 sdhci_readl(host, SDHCI_PRESENT_STATE));
3248 DBG("Caps: 0x%08x | Caps_1: 0x%08x\n",
3249 sdhci_readl(host, SDHCI_CAPABILITIES),
3250 sdhci_readl(host, SDHCI_CAPABILITIES_1));
3251
3252 sdhci_read_caps(host);
3253
3254 override_timeout_clk = host->timeout_clk;
3255
3256 if (host->version > SDHCI_SPEC_300) {
3257 pr_err("%s: Unknown controller version (%d). You may experience problems.\n",
3258 mmc_hostname(mmc), host->version);
3259 }
3260
3261 if (host->quirks & SDHCI_QUIRK_FORCE_DMA)
3262 host->flags |= SDHCI_USE_SDMA;
3263 else if (!(host->caps & SDHCI_CAN_DO_SDMA))
3264 DBG("Controller doesn't have SDMA capability\n");
3265 else
3266 host->flags |= SDHCI_USE_SDMA;
3267
3268 if ((host->quirks & SDHCI_QUIRK_BROKEN_DMA) &&
3269 (host->flags & SDHCI_USE_SDMA)) {
3270 DBG("Disabling DMA as it is marked broken\n");
3271 host->flags &= ~SDHCI_USE_SDMA;
3272 }
3273
3274 if ((host->version >= SDHCI_SPEC_200) &&
3275 (host->caps & SDHCI_CAN_DO_ADMA2))
3276 host->flags |= SDHCI_USE_ADMA;
3277
3278 if ((host->quirks & SDHCI_QUIRK_BROKEN_ADMA) &&
3279 (host->flags & SDHCI_USE_ADMA)) {
3280 DBG("Disabling ADMA as it is marked broken\n");
3281 host->flags &= ~SDHCI_USE_ADMA;
3282 }
3283
3284 /*
3285 * It is assumed that a 64-bit capable device has set a 64-bit DMA mask
3286 * and *must* do 64-bit DMA. A driver has the opportunity to change
3287 * that during the first call to ->enable_dma(). Similarly
3288 * SDHCI_QUIRK2_BROKEN_64_BIT_DMA must be left to the drivers to
3289 * implement.
3290 */
3291 if (host->caps & SDHCI_CAN_64BIT)
3292 host->flags |= SDHCI_USE_64_BIT_DMA;
3293
3294 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
3295 ret = sdhci_set_dma_mask(host);
3296
3297 if (!ret && host->ops->enable_dma)
3298 ret = host->ops->enable_dma(host);
3299
3300 if (ret) {
3301 pr_warn("%s: No suitable DMA available - falling back to PIO\n",
3302 mmc_hostname(mmc));
3303 host->flags &= ~(SDHCI_USE_SDMA | SDHCI_USE_ADMA);
3304
3305 ret = 0;
3306 }
3307 }
3308
3309 /* SDMA does not support 64-bit DMA */
3310 if (host->flags & SDHCI_USE_64_BIT_DMA)
3311 host->flags &= ~SDHCI_USE_SDMA;
3312
3313 if (host->flags & SDHCI_USE_ADMA) {
3314 dma_addr_t dma;
3315 void *buf;
3316
3317 /*
3318 * The DMA descriptor table size is calculated as the maximum
3319 * number of segments times 2, to allow for an alignment
3320 * descriptor for each segment, plus 1 for a nop end descriptor,
3321 * all multipled by the descriptor size.
3322 */
3323 if (host->flags & SDHCI_USE_64_BIT_DMA) {
3324 host->adma_table_sz = (SDHCI_MAX_SEGS * 2 + 1) *
3325 SDHCI_ADMA2_64_DESC_SZ;
3326 host->desc_sz = SDHCI_ADMA2_64_DESC_SZ;
3327 } else {
3328 host->adma_table_sz = (SDHCI_MAX_SEGS * 2 + 1) *
3329 SDHCI_ADMA2_32_DESC_SZ;
3330 host->desc_sz = SDHCI_ADMA2_32_DESC_SZ;
3331 }
3332
3333 host->align_buffer_sz = SDHCI_MAX_SEGS * SDHCI_ADMA2_ALIGN;
3334 buf = dma_alloc_coherent(mmc_dev(mmc), host->align_buffer_sz +
3335 host->adma_table_sz, &dma, GFP_KERNEL);
3336 if (!buf) {
3337 pr_warn("%s: Unable to allocate ADMA buffers - falling back to standard DMA\n",
3338 mmc_hostname(mmc));
3339 host->flags &= ~SDHCI_USE_ADMA;
3340 } else if ((dma + host->align_buffer_sz) &
3341 (SDHCI_ADMA2_DESC_ALIGN - 1)) {
3342 pr_warn("%s: unable to allocate aligned ADMA descriptor\n",
3343 mmc_hostname(mmc));
3344 host->flags &= ~SDHCI_USE_ADMA;
3345 dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz +
3346 host->adma_table_sz, buf, dma);
3347 } else {
3348 host->align_buffer = buf;
3349 host->align_addr = dma;
3350
3351 host->adma_table = buf + host->align_buffer_sz;
3352 host->adma_addr = dma + host->align_buffer_sz;
3353 }
3354 }
3355
3356 /*
3357 * If we use DMA, then it's up to the caller to set the DMA
3358 * mask, but PIO does not need the hw shim so we set a new
3359 * mask here in that case.
3360 */
3361 if (!(host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA))) {
3362 host->dma_mask = DMA_BIT_MASK(64);
3363 mmc_dev(mmc)->dma_mask = &host->dma_mask;
3364 }
3365
3366 if (host->version >= SDHCI_SPEC_300)
3367 host->max_clk = (host->caps & SDHCI_CLOCK_V3_BASE_MASK)
3368 >> SDHCI_CLOCK_BASE_SHIFT;
3369 else
3370 host->max_clk = (host->caps & SDHCI_CLOCK_BASE_MASK)
3371 >> SDHCI_CLOCK_BASE_SHIFT;
3372
3373 host->max_clk *= 1000000;
3374 if (host->max_clk == 0 || host->quirks &
3375 SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN) {
3376 if (!host->ops->get_max_clock) {
3377 pr_err("%s: Hardware doesn't specify base clock frequency.\n",
3378 mmc_hostname(mmc));
3379 ret = -ENODEV;
3380 goto undma;
3381 }
3382 host->max_clk = host->ops->get_max_clock(host);
3383 }
3384
3385 /*
3386 * In case of Host Controller v3.00, find out whether clock
3387 * multiplier is supported.
3388 */
3389 host->clk_mul = (host->caps1 & SDHCI_CLOCK_MUL_MASK) >>
3390 SDHCI_CLOCK_MUL_SHIFT;
3391
3392 /*
3393 * In case the value in Clock Multiplier is 0, then programmable
3394 * clock mode is not supported, otherwise the actual clock
3395 * multiplier is one more than the value of Clock Multiplier
3396 * in the Capabilities Register.
3397 */
3398 if (host->clk_mul)
3399 host->clk_mul += 1;
3400
3401 /*
3402 * Set host parameters.
3403 */
3404 max_clk = host->max_clk;
3405
3406 if (host->ops->get_min_clock)
3407 mmc->f_min = host->ops->get_min_clock(host);
3408 else if (host->version >= SDHCI_SPEC_300) {
3409 if (host->clk_mul) {
3410 mmc->f_min = (host->max_clk * host->clk_mul) / 1024;
3411 max_clk = host->max_clk * host->clk_mul;
3412 } else
3413 mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_300;
3414 } else
3415 mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_200;
3416
3417 if (!mmc->f_max || mmc->f_max > max_clk)
3418 mmc->f_max = max_clk;
3419
3420 if (!(host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK)) {
3421 host->timeout_clk = (host->caps & SDHCI_TIMEOUT_CLK_MASK) >>
3422 SDHCI_TIMEOUT_CLK_SHIFT;
3423
3424 if (host->caps & SDHCI_TIMEOUT_CLK_UNIT)
3425 host->timeout_clk *= 1000;
3426
3427 if (host->timeout_clk == 0) {
3428 if (!host->ops->get_timeout_clock) {
3429 pr_err("%s: Hardware doesn't specify timeout clock frequency.\n",
3430 mmc_hostname(mmc));
3431 ret = -ENODEV;
3432 goto undma;
3433 }
3434
3435 host->timeout_clk =
3436 DIV_ROUND_UP(host->ops->get_timeout_clock(host),
3437 1000);
3438 }
3439
3440 if (override_timeout_clk)
3441 host->timeout_clk = override_timeout_clk;
3442
3443 mmc->max_busy_timeout = host->ops->get_max_timeout_count ?
3444 host->ops->get_max_timeout_count(host) : 1 << 27;
3445 mmc->max_busy_timeout /= host->timeout_clk;
3446 }
3447
3448 mmc->caps |= MMC_CAP_SDIO_IRQ | MMC_CAP_ERASE | MMC_CAP_CMD23;
3449 mmc->caps2 |= MMC_CAP2_SDIO_IRQ_NOTHREAD;
3450
3451 if (host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12)
3452 host->flags |= SDHCI_AUTO_CMD12;
3453
3454 /* Auto-CMD23 stuff only works in ADMA or PIO. */
3455 if ((host->version >= SDHCI_SPEC_300) &&
3456 ((host->flags & SDHCI_USE_ADMA) ||
3457 !(host->flags & SDHCI_USE_SDMA)) &&
3458 !(host->quirks2 & SDHCI_QUIRK2_ACMD23_BROKEN)) {
3459 host->flags |= SDHCI_AUTO_CMD23;
3460 DBG("Auto-CMD23 available\n");
3461 } else {
3462 DBG("Auto-CMD23 unavailable\n");
3463 }
3464
3465 /*
3466 * A controller may support 8-bit width, but the board itself
3467 * might not have the pins brought out. Boards that support
3468 * 8-bit width must set "mmc->caps |= MMC_CAP_8_BIT_DATA;" in
3469 * their platform code before calling sdhci_add_host(), and we
3470 * won't assume 8-bit width for hosts without that CAP.
3471 */
3472 if (!(host->quirks & SDHCI_QUIRK_FORCE_1_BIT_DATA))
3473 mmc->caps |= MMC_CAP_4_BIT_DATA;
3474
3475 if (host->quirks2 & SDHCI_QUIRK2_HOST_NO_CMD23)
3476 mmc->caps &= ~MMC_CAP_CMD23;
3477
3478 if (host->caps & SDHCI_CAN_DO_HISPD)
3479 mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
3480
3481 if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) &&
3482 mmc_card_is_removable(mmc) &&
3483 mmc_gpio_get_cd(host->mmc) < 0)
3484 mmc->caps |= MMC_CAP_NEEDS_POLL;
3485
3486 /* If vqmmc regulator and no 1.8V signalling, then there's no UHS */
3487 if (!IS_ERR(mmc->supply.vqmmc)) {
3488 ret = regulator_enable(mmc->supply.vqmmc);
3489 if (!regulator_is_supported_voltage(mmc->supply.vqmmc, 1700000,
3490 1950000))
3491 host->caps1 &= ~(SDHCI_SUPPORT_SDR104 |
3492 SDHCI_SUPPORT_SDR50 |
3493 SDHCI_SUPPORT_DDR50);
3494 if (ret) {
3495 pr_warn("%s: Failed to enable vqmmc regulator: %d\n",
3496 mmc_hostname(mmc), ret);
3497 mmc->supply.vqmmc = ERR_PTR(-EINVAL);
3498 }
3499 }
3500
3501 if (host->quirks2 & SDHCI_QUIRK2_NO_1_8_V) {
3502 host->caps1 &= ~(SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 |
3503 SDHCI_SUPPORT_DDR50);
3504 }
3505
3506 /* Any UHS-I mode in caps implies SDR12 and SDR25 support. */
3507 if (host->caps1 & (SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 |
3508 SDHCI_SUPPORT_DDR50))
3509 mmc->caps |= MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25;
3510
3511 /* SDR104 supports also implies SDR50 support */
3512 if (host->caps1 & SDHCI_SUPPORT_SDR104) {
3513 mmc->caps |= MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_SDR50;
3514 /* SD3.0: SDR104 is supported so (for eMMC) the caps2
3515 * field can be promoted to support HS200.
3516 */
3517 if (!(host->quirks2 & SDHCI_QUIRK2_BROKEN_HS200))
3518 mmc->caps2 |= MMC_CAP2_HS200;
3519 } else if (host->caps1 & SDHCI_SUPPORT_SDR50) {
3520 mmc->caps |= MMC_CAP_UHS_SDR50;
3521 }
3522
3523 if (host->quirks2 & SDHCI_QUIRK2_CAPS_BIT63_FOR_HS400 &&
3524 (host->caps1 & SDHCI_SUPPORT_HS400))
3525 mmc->caps2 |= MMC_CAP2_HS400;
3526
3527 if ((mmc->caps2 & MMC_CAP2_HSX00_1_2V) &&
3528 (IS_ERR(mmc->supply.vqmmc) ||
3529 !regulator_is_supported_voltage(mmc->supply.vqmmc, 1100000,
3530 1300000)))
3531 mmc->caps2 &= ~MMC_CAP2_HSX00_1_2V;
3532
3533 if ((host->caps1 & SDHCI_SUPPORT_DDR50) &&
3534 !(host->quirks2 & SDHCI_QUIRK2_BROKEN_DDR50))
3535 mmc->caps |= MMC_CAP_UHS_DDR50;
3536
3537 /* Does the host need tuning for SDR50? */
3538 if (host->caps1 & SDHCI_USE_SDR50_TUNING)
3539 host->flags |= SDHCI_SDR50_NEEDS_TUNING;
3540
3541 /* Driver Type(s) (A, C, D) supported by the host */
3542 if (host->caps1 & SDHCI_DRIVER_TYPE_A)
3543 mmc->caps |= MMC_CAP_DRIVER_TYPE_A;
3544 if (host->caps1 & SDHCI_DRIVER_TYPE_C)
3545 mmc->caps |= MMC_CAP_DRIVER_TYPE_C;
3546 if (host->caps1 & SDHCI_DRIVER_TYPE_D)
3547 mmc->caps |= MMC_CAP_DRIVER_TYPE_D;
3548
3549 /* Initial value for re-tuning timer count */
3550 host->tuning_count = (host->caps1 & SDHCI_RETUNING_TIMER_COUNT_MASK) >>
3551 SDHCI_RETUNING_TIMER_COUNT_SHIFT;
3552
3553 /*
3554 * In case Re-tuning Timer is not disabled, the actual value of
3555 * re-tuning timer will be 2 ^ (n - 1).
3556 */
3557 if (host->tuning_count)
3558 host->tuning_count = 1 << (host->tuning_count - 1);
3559
3560 /* Re-tuning mode supported by the Host Controller */
3561 host->tuning_mode = (host->caps1 & SDHCI_RETUNING_MODE_MASK) >>
3562 SDHCI_RETUNING_MODE_SHIFT;
3563
3564 ocr_avail = 0;
3565
3566 /*
3567 * According to SD Host Controller spec v3.00, if the Host System
3568 * can afford more than 150mA, Host Driver should set XPC to 1. Also
3569 * the value is meaningful only if Voltage Support in the Capabilities
3570 * register is set. The actual current value is 4 times the register
3571 * value.
3572 */
3573 max_current_caps = sdhci_readl(host, SDHCI_MAX_CURRENT);
3574 if (!max_current_caps && !IS_ERR(mmc->supply.vmmc)) {
3575 int curr = regulator_get_current_limit(mmc->supply.vmmc);
3576 if (curr > 0) {
3577
3578 /* convert to SDHCI_MAX_CURRENT format */
3579 curr = curr/1000; /* convert to mA */
3580 curr = curr/SDHCI_MAX_CURRENT_MULTIPLIER;
3581
3582 curr = min_t(u32, curr, SDHCI_MAX_CURRENT_LIMIT);
3583 max_current_caps =
3584 (curr << SDHCI_MAX_CURRENT_330_SHIFT) |
3585 (curr << SDHCI_MAX_CURRENT_300_SHIFT) |
3586 (curr << SDHCI_MAX_CURRENT_180_SHIFT);
3587 }
3588 }
3589
3590 if (host->caps & SDHCI_CAN_VDD_330) {
3591 ocr_avail |= MMC_VDD_32_33 | MMC_VDD_33_34;
3592
3593 mmc->max_current_330 = ((max_current_caps &
3594 SDHCI_MAX_CURRENT_330_MASK) >>
3595 SDHCI_MAX_CURRENT_330_SHIFT) *
3596 SDHCI_MAX_CURRENT_MULTIPLIER;
3597 }
3598 if (host->caps & SDHCI_CAN_VDD_300) {
3599 ocr_avail |= MMC_VDD_29_30 | MMC_VDD_30_31;
3600
3601 mmc->max_current_300 = ((max_current_caps &
3602 SDHCI_MAX_CURRENT_300_MASK) >>
3603 SDHCI_MAX_CURRENT_300_SHIFT) *
3604 SDHCI_MAX_CURRENT_MULTIPLIER;
3605 }
3606 if (host->caps & SDHCI_CAN_VDD_180) {
3607 ocr_avail |= MMC_VDD_165_195;
3608
3609 mmc->max_current_180 = ((max_current_caps &
3610 SDHCI_MAX_CURRENT_180_MASK) >>
3611 SDHCI_MAX_CURRENT_180_SHIFT) *
3612 SDHCI_MAX_CURRENT_MULTIPLIER;
3613 }
3614
3615 /* If OCR set by host, use it instead. */
3616 if (host->ocr_mask)
3617 ocr_avail = host->ocr_mask;
3618
3619 /* If OCR set by external regulators, give it highest prio. */
3620 if (mmc->ocr_avail)
3621 ocr_avail = mmc->ocr_avail;
3622
3623 mmc->ocr_avail = ocr_avail;
3624 mmc->ocr_avail_sdio = ocr_avail;
3625 if (host->ocr_avail_sdio)
3626 mmc->ocr_avail_sdio &= host->ocr_avail_sdio;
3627 mmc->ocr_avail_sd = ocr_avail;
3628 if (host->ocr_avail_sd)
3629 mmc->ocr_avail_sd &= host->ocr_avail_sd;
3630 else /* normal SD controllers don't support 1.8V */
3631 mmc->ocr_avail_sd &= ~MMC_VDD_165_195;
3632 mmc->ocr_avail_mmc = ocr_avail;
3633 if (host->ocr_avail_mmc)
3634 mmc->ocr_avail_mmc &= host->ocr_avail_mmc;
3635
3636 if (mmc->ocr_avail == 0) {
3637 pr_err("%s: Hardware doesn't report any support voltages.\n",
3638 mmc_hostname(mmc));
3639 ret = -ENODEV;
3640 goto unreg;
3641 }
3642
3643 if ((mmc->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
3644 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 |
3645 MMC_CAP_UHS_DDR50 | MMC_CAP_1_8V_DDR)) ||
3646 (mmc->caps2 & (MMC_CAP2_HS200_1_8V_SDR | MMC_CAP2_HS400_1_8V)))
3647 host->flags |= SDHCI_SIGNALING_180;
3648
3649 if (mmc->caps2 & MMC_CAP2_HSX00_1_2V)
3650 host->flags |= SDHCI_SIGNALING_120;
3651
3652 spin_lock_init(&host->lock);
3653
3654 /*
3655 * Maximum number of sectors in one transfer. Limited by SDMA boundary
3656 * size (512KiB). Note some tuning modes impose a 4MiB limit, but this
3657 * is less anyway.
3658 */
3659 mmc->max_req_size = 524288;
3660
3661 /*
3662 * Maximum number of segments. Depends on if the hardware
3663 * can do scatter/gather or not.
3664 */
3665 if (host->flags & SDHCI_USE_ADMA) {
3666 mmc->max_segs = SDHCI_MAX_SEGS;
3667 } else if (host->flags & SDHCI_USE_SDMA) {
3668 mmc->max_segs = 1;
3669 if (swiotlb_max_segment()) {
3670 unsigned int max_req_size = (1 << IO_TLB_SHIFT) *
3671 IO_TLB_SEGSIZE;
3672 mmc->max_req_size = min(mmc->max_req_size,
3673 max_req_size);
3674 }
3675 } else { /* PIO */
3676 mmc->max_segs = SDHCI_MAX_SEGS;
3677 }
3678
3679 /*
3680 * Maximum segment size. Could be one segment with the maximum number
3681 * of bytes. When doing hardware scatter/gather, each entry cannot
3682 * be larger than 64 KiB though.
3683 */
3684 if (host->flags & SDHCI_USE_ADMA) {
3685 if (host->quirks & SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC)
3686 mmc->max_seg_size = 65535;
3687 else
3688 mmc->max_seg_size = 65536;
3689 } else {
3690 mmc->max_seg_size = mmc->max_req_size;
3691 }
3692
3693 /*
3694 * Maximum block size. This varies from controller to controller and
3695 * is specified in the capabilities register.
3696 */
3697 if (host->quirks & SDHCI_QUIRK_FORCE_BLK_SZ_2048) {
3698 mmc->max_blk_size = 2;
3699 } else {
3700 mmc->max_blk_size = (host->caps & SDHCI_MAX_BLOCK_MASK) >>
3701 SDHCI_MAX_BLOCK_SHIFT;
3702 if (mmc->max_blk_size >= 3) {
3703 pr_warn("%s: Invalid maximum block size, assuming 512 bytes\n",
3704 mmc_hostname(mmc));
3705 mmc->max_blk_size = 0;
3706 }
3707 }
3708
3709 mmc->max_blk_size = 512 << mmc->max_blk_size;
3710
3711 /*
3712 * Maximum block count.
3713 */
3714 mmc->max_blk_count = (host->quirks & SDHCI_QUIRK_NO_MULTIBLOCK) ? 1 : 65535;
3715
3716 return 0;
3717
3718 unreg:
3719 if (!IS_ERR(mmc->supply.vqmmc))
3720 regulator_disable(mmc->supply.vqmmc);
3721 undma:
3722 if (host->align_buffer)
3723 dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz +
3724 host->adma_table_sz, host->align_buffer,
3725 host->align_addr);
3726 host->adma_table = NULL;
3727 host->align_buffer = NULL;
3728
3729 return ret;
3730 }
3731 EXPORT_SYMBOL_GPL(sdhci_setup_host);
3732
3733 void sdhci_cleanup_host(struct sdhci_host *host)
3734 {
3735 struct mmc_host *mmc = host->mmc;
3736
3737 if (!IS_ERR(mmc->supply.vqmmc))
3738 regulator_disable(mmc->supply.vqmmc);
3739
3740 if (host->align_buffer)
3741 dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz +
3742 host->adma_table_sz, host->align_buffer,
3743 host->align_addr);
3744 host->adma_table = NULL;
3745 host->align_buffer = NULL;
3746 }
3747 EXPORT_SYMBOL_GPL(sdhci_cleanup_host);
3748
3749 int __sdhci_add_host(struct sdhci_host *host)
3750 {
3751 struct mmc_host *mmc = host->mmc;
3752 int ret;
3753
3754 /*
3755 * Init tasklets.
3756 */
3757 tasklet_init(&host->finish_tasklet,
3758 sdhci_tasklet_finish, (unsigned long)host);
3759
3760 timer_setup(&host->timer, sdhci_timeout_timer, 0);
3761 timer_setup(&host->data_timer, sdhci_timeout_data_timer, 0);
3762
3763 init_waitqueue_head(&host->buf_ready_int);
3764
3765 sdhci_init(host, 0);
3766
3767 ret = request_threaded_irq(host->irq, sdhci_irq, sdhci_thread_irq,
3768 IRQF_SHARED, mmc_hostname(mmc), host);
3769 if (ret) {
3770 pr_err("%s: Failed to request IRQ %d: %d\n",
3771 mmc_hostname(mmc), host->irq, ret);
3772 goto untasklet;
3773 }
3774
3775 ret = sdhci_led_register(host);
3776 if (ret) {
3777 pr_err("%s: Failed to register LED device: %d\n",
3778 mmc_hostname(mmc), ret);
3779 goto unirq;
3780 }
3781
3782 mmiowb();
3783
3784 ret = mmc_add_host(mmc);
3785 if (ret)
3786 goto unled;
3787
3788 pr_info("%s: SDHCI controller on %s [%s] using %s\n",
3789 mmc_hostname(mmc), host->hw_name, dev_name(mmc_dev(mmc)),
3790 (host->flags & SDHCI_USE_ADMA) ?
3791 (host->flags & SDHCI_USE_64_BIT_DMA) ? "ADMA 64-bit" : "ADMA" :
3792 (host->flags & SDHCI_USE_SDMA) ? "DMA" : "PIO");
3793
3794 sdhci_enable_card_detection(host);
3795
3796 return 0;
3797
3798 unled:
3799 sdhci_led_unregister(host);
3800 unirq:
3801 sdhci_do_reset(host, SDHCI_RESET_ALL);
3802 sdhci_writel(host, 0, SDHCI_INT_ENABLE);
3803 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
3804 free_irq(host->irq, host);
3805 untasklet:
3806 tasklet_kill(&host->finish_tasklet);
3807
3808 return ret;
3809 }
3810 EXPORT_SYMBOL_GPL(__sdhci_add_host);
3811
3812 int sdhci_add_host(struct sdhci_host *host)
3813 {
3814 int ret;
3815
3816 ret = sdhci_setup_host(host);
3817 if (ret)
3818 return ret;
3819
3820 ret = __sdhci_add_host(host);
3821 if (ret)
3822 goto cleanup;
3823
3824 return 0;
3825
3826 cleanup:
3827 sdhci_cleanup_host(host);
3828
3829 return ret;
3830 }
3831 EXPORT_SYMBOL_GPL(sdhci_add_host);
3832
3833 void sdhci_remove_host(struct sdhci_host *host, int dead)
3834 {
3835 struct mmc_host *mmc = host->mmc;
3836 unsigned long flags;
3837
3838 if (dead) {
3839 spin_lock_irqsave(&host->lock, flags);
3840
3841 host->flags |= SDHCI_DEVICE_DEAD;
3842
3843 if (sdhci_has_requests(host)) {
3844 pr_err("%s: Controller removed during "
3845 " transfer!\n", mmc_hostname(mmc));
3846 sdhci_error_out_mrqs(host, -ENOMEDIUM);
3847 }
3848
3849 spin_unlock_irqrestore(&host->lock, flags);
3850 }
3851
3852 sdhci_disable_card_detection(host);
3853
3854 mmc_remove_host(mmc);
3855
3856 sdhci_led_unregister(host);
3857
3858 if (!dead)
3859 sdhci_do_reset(host, SDHCI_RESET_ALL);
3860
3861 sdhci_writel(host, 0, SDHCI_INT_ENABLE);
3862 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
3863 free_irq(host->irq, host);
3864
3865 del_timer_sync(&host->timer);
3866 del_timer_sync(&host->data_timer);
3867
3868 tasklet_kill(&host->finish_tasklet);
3869
3870 if (!IS_ERR(mmc->supply.vqmmc))
3871 regulator_disable(mmc->supply.vqmmc);
3872
3873 if (host->align_buffer)
3874 dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz +
3875 host->adma_table_sz, host->align_buffer,
3876 host->align_addr);
3877
3878 host->adma_table = NULL;
3879 host->align_buffer = NULL;
3880 }
3881
3882 EXPORT_SYMBOL_GPL(sdhci_remove_host);
3883
3884 void sdhci_free_host(struct sdhci_host *host)
3885 {
3886 mmc_free_host(host->mmc);
3887 }
3888
3889 EXPORT_SYMBOL_GPL(sdhci_free_host);
3890
3891 /*****************************************************************************\
3892 * *
3893 * Driver init/exit *
3894 * *
3895 \*****************************************************************************/
3896
3897 static int __init sdhci_drv_init(void)
3898 {
3899 pr_info(DRIVER_NAME
3900 ": Secure Digital Host Controller Interface driver\n");
3901 pr_info(DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
3902
3903 return 0;
3904 }
3905
3906 static void __exit sdhci_drv_exit(void)
3907 {
3908 }
3909
3910 module_init(sdhci_drv_init);
3911 module_exit(sdhci_drv_exit);
3912
3913 module_param(debug_quirks, uint, 0444);
3914 module_param(debug_quirks2, uint, 0444);
3915
3916 MODULE_AUTHOR("Pierre Ossman <pierre@ossman.eu>");
3917 MODULE_DESCRIPTION("Secure Digital Host Controller Interface core driver");
3918 MODULE_LICENSE("GPL");
3919
3920 MODULE_PARM_DESC(debug_quirks, "Force certain quirks.");
3921 MODULE_PARM_DESC(debug_quirks2, "Force certain other quirks.");
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