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Merge tag 'mac80211-for-davem-2016-06-29-v2' of git://git.kernel.org/pub/scm/linux...
[mirror_ubuntu-focal-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/highmem.h>
18 #include <linux/io.h>
19 #include <linux/module.h>
20 #include <linux/dma-mapping.h>
21 #include <linux/slab.h>
22 #include <linux/scatterlist.h>
23 #include <linux/regulator/consumer.h>
24 #include <linux/pm_runtime.h>
25
26 #include <linux/leds.h>
27
28 #include <linux/mmc/mmc.h>
29 #include <linux/mmc/host.h>
30 #include <linux/mmc/card.h>
31 #include <linux/mmc/sdio.h>
32 #include <linux/mmc/slot-gpio.h>
33
34 #include "sdhci.h"
35
36 #define DRIVER_NAME "sdhci"
37
38 #define DBG(f, x...) \
39 pr_debug(DRIVER_NAME " [%s()]: " f, __func__,## x)
40
41 #define MAX_TUNING_LOOP 40
42
43 static unsigned int debug_quirks = 0;
44 static unsigned int debug_quirks2;
45
46 static void sdhci_finish_data(struct sdhci_host *);
47
48 static void sdhci_finish_command(struct sdhci_host *);
49 static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode);
50 static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable);
51 static int sdhci_get_cd(struct mmc_host *mmc);
52
53 static void sdhci_dumpregs(struct sdhci_host *host)
54 {
55 pr_debug(DRIVER_NAME ": =========== REGISTER DUMP (%s)===========\n",
56 mmc_hostname(host->mmc));
57
58 pr_debug(DRIVER_NAME ": Sys addr: 0x%08x | Version: 0x%08x\n",
59 sdhci_readl(host, SDHCI_DMA_ADDRESS),
60 sdhci_readw(host, SDHCI_HOST_VERSION));
61 pr_debug(DRIVER_NAME ": Blk size: 0x%08x | Blk cnt: 0x%08x\n",
62 sdhci_readw(host, SDHCI_BLOCK_SIZE),
63 sdhci_readw(host, SDHCI_BLOCK_COUNT));
64 pr_debug(DRIVER_NAME ": Argument: 0x%08x | Trn mode: 0x%08x\n",
65 sdhci_readl(host, SDHCI_ARGUMENT),
66 sdhci_readw(host, SDHCI_TRANSFER_MODE));
67 pr_debug(DRIVER_NAME ": Present: 0x%08x | Host ctl: 0x%08x\n",
68 sdhci_readl(host, SDHCI_PRESENT_STATE),
69 sdhci_readb(host, SDHCI_HOST_CONTROL));
70 pr_debug(DRIVER_NAME ": Power: 0x%08x | Blk gap: 0x%08x\n",
71 sdhci_readb(host, SDHCI_POWER_CONTROL),
72 sdhci_readb(host, SDHCI_BLOCK_GAP_CONTROL));
73 pr_debug(DRIVER_NAME ": Wake-up: 0x%08x | Clock: 0x%08x\n",
74 sdhci_readb(host, SDHCI_WAKE_UP_CONTROL),
75 sdhci_readw(host, SDHCI_CLOCK_CONTROL));
76 pr_debug(DRIVER_NAME ": Timeout: 0x%08x | Int stat: 0x%08x\n",
77 sdhci_readb(host, SDHCI_TIMEOUT_CONTROL),
78 sdhci_readl(host, SDHCI_INT_STATUS));
79 pr_debug(DRIVER_NAME ": Int enab: 0x%08x | Sig enab: 0x%08x\n",
80 sdhci_readl(host, SDHCI_INT_ENABLE),
81 sdhci_readl(host, SDHCI_SIGNAL_ENABLE));
82 pr_debug(DRIVER_NAME ": AC12 err: 0x%08x | Slot int: 0x%08x\n",
83 sdhci_readw(host, SDHCI_ACMD12_ERR),
84 sdhci_readw(host, SDHCI_SLOT_INT_STATUS));
85 pr_debug(DRIVER_NAME ": Caps: 0x%08x | Caps_1: 0x%08x\n",
86 sdhci_readl(host, SDHCI_CAPABILITIES),
87 sdhci_readl(host, SDHCI_CAPABILITIES_1));
88 pr_debug(DRIVER_NAME ": Cmd: 0x%08x | Max curr: 0x%08x\n",
89 sdhci_readw(host, SDHCI_COMMAND),
90 sdhci_readl(host, SDHCI_MAX_CURRENT));
91 pr_debug(DRIVER_NAME ": Host ctl2: 0x%08x\n",
92 sdhci_readw(host, SDHCI_HOST_CONTROL2));
93
94 if (host->flags & SDHCI_USE_ADMA) {
95 if (host->flags & SDHCI_USE_64_BIT_DMA)
96 pr_debug(DRIVER_NAME ": ADMA Err: 0x%08x | ADMA Ptr: 0x%08x%08x\n",
97 readl(host->ioaddr + SDHCI_ADMA_ERROR),
98 readl(host->ioaddr + SDHCI_ADMA_ADDRESS_HI),
99 readl(host->ioaddr + SDHCI_ADMA_ADDRESS));
100 else
101 pr_debug(DRIVER_NAME ": ADMA Err: 0x%08x | ADMA Ptr: 0x%08x\n",
102 readl(host->ioaddr + SDHCI_ADMA_ERROR),
103 readl(host->ioaddr + SDHCI_ADMA_ADDRESS));
104 }
105
106 pr_debug(DRIVER_NAME ": ===========================================\n");
107 }
108
109 /*****************************************************************************\
110 * *
111 * Low level functions *
112 * *
113 \*****************************************************************************/
114
115 static void sdhci_set_card_detection(struct sdhci_host *host, bool enable)
116 {
117 u32 present;
118
119 if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) ||
120 (host->mmc->caps & MMC_CAP_NONREMOVABLE))
121 return;
122
123 if (enable) {
124 present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
125 SDHCI_CARD_PRESENT;
126
127 host->ier |= present ? SDHCI_INT_CARD_REMOVE :
128 SDHCI_INT_CARD_INSERT;
129 } else {
130 host->ier &= ~(SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT);
131 }
132
133 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
134 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
135 }
136
137 static void sdhci_enable_card_detection(struct sdhci_host *host)
138 {
139 sdhci_set_card_detection(host, true);
140 }
141
142 static void sdhci_disable_card_detection(struct sdhci_host *host)
143 {
144 sdhci_set_card_detection(host, false);
145 }
146
147 static void sdhci_runtime_pm_bus_on(struct sdhci_host *host)
148 {
149 if (host->bus_on)
150 return;
151 host->bus_on = true;
152 pm_runtime_get_noresume(host->mmc->parent);
153 }
154
155 static void sdhci_runtime_pm_bus_off(struct sdhci_host *host)
156 {
157 if (!host->bus_on)
158 return;
159 host->bus_on = false;
160 pm_runtime_put_noidle(host->mmc->parent);
161 }
162
163 void sdhci_reset(struct sdhci_host *host, u8 mask)
164 {
165 unsigned long timeout;
166
167 sdhci_writeb(host, mask, SDHCI_SOFTWARE_RESET);
168
169 if (mask & SDHCI_RESET_ALL) {
170 host->clock = 0;
171 /* Reset-all turns off SD Bus Power */
172 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
173 sdhci_runtime_pm_bus_off(host);
174 }
175
176 /* Wait max 100 ms */
177 timeout = 100;
178
179 /* hw clears the bit when it's done */
180 while (sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask) {
181 if (timeout == 0) {
182 pr_err("%s: Reset 0x%x never completed.\n",
183 mmc_hostname(host->mmc), (int)mask);
184 sdhci_dumpregs(host);
185 return;
186 }
187 timeout--;
188 mdelay(1);
189 }
190 }
191 EXPORT_SYMBOL_GPL(sdhci_reset);
192
193 static void sdhci_do_reset(struct sdhci_host *host, u8 mask)
194 {
195 if (host->quirks & SDHCI_QUIRK_NO_CARD_NO_RESET) {
196 if (!sdhci_get_cd(host->mmc))
197 return;
198 }
199
200 host->ops->reset(host, mask);
201
202 if (mask & SDHCI_RESET_ALL) {
203 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
204 if (host->ops->enable_dma)
205 host->ops->enable_dma(host);
206 }
207
208 /* Resetting the controller clears many */
209 host->preset_enabled = false;
210 }
211 }
212
213 static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios);
214
215 static void sdhci_init(struct sdhci_host *host, int soft)
216 {
217 if (soft)
218 sdhci_do_reset(host, SDHCI_RESET_CMD|SDHCI_RESET_DATA);
219 else
220 sdhci_do_reset(host, SDHCI_RESET_ALL);
221
222 host->ier = SDHCI_INT_BUS_POWER | SDHCI_INT_DATA_END_BIT |
223 SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_TIMEOUT |
224 SDHCI_INT_INDEX | SDHCI_INT_END_BIT | SDHCI_INT_CRC |
225 SDHCI_INT_TIMEOUT | SDHCI_INT_DATA_END |
226 SDHCI_INT_RESPONSE;
227
228 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
229 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
230
231 if (soft) {
232 /* force clock reconfiguration */
233 host->clock = 0;
234 sdhci_set_ios(host->mmc, &host->mmc->ios);
235 }
236 }
237
238 static void sdhci_reinit(struct sdhci_host *host)
239 {
240 sdhci_init(host, 0);
241 sdhci_enable_card_detection(host);
242 }
243
244 static void __sdhci_led_activate(struct sdhci_host *host)
245 {
246 u8 ctrl;
247
248 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
249 ctrl |= SDHCI_CTRL_LED;
250 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
251 }
252
253 static void __sdhci_led_deactivate(struct sdhci_host *host)
254 {
255 u8 ctrl;
256
257 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
258 ctrl &= ~SDHCI_CTRL_LED;
259 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
260 }
261
262 #if IS_REACHABLE(CONFIG_LEDS_CLASS)
263 static void sdhci_led_control(struct led_classdev *led,
264 enum led_brightness brightness)
265 {
266 struct sdhci_host *host = container_of(led, struct sdhci_host, led);
267 unsigned long flags;
268
269 spin_lock_irqsave(&host->lock, flags);
270
271 if (host->runtime_suspended)
272 goto out;
273
274 if (brightness == LED_OFF)
275 __sdhci_led_deactivate(host);
276 else
277 __sdhci_led_activate(host);
278 out:
279 spin_unlock_irqrestore(&host->lock, flags);
280 }
281
282 static int sdhci_led_register(struct sdhci_host *host)
283 {
284 struct mmc_host *mmc = host->mmc;
285
286 snprintf(host->led_name, sizeof(host->led_name),
287 "%s::", mmc_hostname(mmc));
288
289 host->led.name = host->led_name;
290 host->led.brightness = LED_OFF;
291 host->led.default_trigger = mmc_hostname(mmc);
292 host->led.brightness_set = sdhci_led_control;
293
294 return led_classdev_register(mmc_dev(mmc), &host->led);
295 }
296
297 static void sdhci_led_unregister(struct sdhci_host *host)
298 {
299 led_classdev_unregister(&host->led);
300 }
301
302 static inline void sdhci_led_activate(struct sdhci_host *host)
303 {
304 }
305
306 static inline void sdhci_led_deactivate(struct sdhci_host *host)
307 {
308 }
309
310 #else
311
312 static inline int sdhci_led_register(struct sdhci_host *host)
313 {
314 return 0;
315 }
316
317 static inline void sdhci_led_unregister(struct sdhci_host *host)
318 {
319 }
320
321 static inline void sdhci_led_activate(struct sdhci_host *host)
322 {
323 __sdhci_led_activate(host);
324 }
325
326 static inline void sdhci_led_deactivate(struct sdhci_host *host)
327 {
328 __sdhci_led_deactivate(host);
329 }
330
331 #endif
332
333 /*****************************************************************************\
334 * *
335 * Core functions *
336 * *
337 \*****************************************************************************/
338
339 static void sdhci_read_block_pio(struct sdhci_host *host)
340 {
341 unsigned long flags;
342 size_t blksize, len, chunk;
343 u32 uninitialized_var(scratch);
344 u8 *buf;
345
346 DBG("PIO reading\n");
347
348 blksize = host->data->blksz;
349 chunk = 0;
350
351 local_irq_save(flags);
352
353 while (blksize) {
354 BUG_ON(!sg_miter_next(&host->sg_miter));
355
356 len = min(host->sg_miter.length, blksize);
357
358 blksize -= len;
359 host->sg_miter.consumed = len;
360
361 buf = host->sg_miter.addr;
362
363 while (len) {
364 if (chunk == 0) {
365 scratch = sdhci_readl(host, SDHCI_BUFFER);
366 chunk = 4;
367 }
368
369 *buf = scratch & 0xFF;
370
371 buf++;
372 scratch >>= 8;
373 chunk--;
374 len--;
375 }
376 }
377
378 sg_miter_stop(&host->sg_miter);
379
380 local_irq_restore(flags);
381 }
382
383 static void sdhci_write_block_pio(struct sdhci_host *host)
384 {
385 unsigned long flags;
386 size_t blksize, len, chunk;
387 u32 scratch;
388 u8 *buf;
389
390 DBG("PIO writing\n");
391
392 blksize = host->data->blksz;
393 chunk = 0;
394 scratch = 0;
395
396 local_irq_save(flags);
397
398 while (blksize) {
399 BUG_ON(!sg_miter_next(&host->sg_miter));
400
401 len = min(host->sg_miter.length, blksize);
402
403 blksize -= len;
404 host->sg_miter.consumed = len;
405
406 buf = host->sg_miter.addr;
407
408 while (len) {
409 scratch |= (u32)*buf << (chunk * 8);
410
411 buf++;
412 chunk++;
413 len--;
414
415 if ((chunk == 4) || ((len == 0) && (blksize == 0))) {
416 sdhci_writel(host, scratch, SDHCI_BUFFER);
417 chunk = 0;
418 scratch = 0;
419 }
420 }
421 }
422
423 sg_miter_stop(&host->sg_miter);
424
425 local_irq_restore(flags);
426 }
427
428 static void sdhci_transfer_pio(struct sdhci_host *host)
429 {
430 u32 mask;
431
432 BUG_ON(!host->data);
433
434 if (host->blocks == 0)
435 return;
436
437 if (host->data->flags & MMC_DATA_READ)
438 mask = SDHCI_DATA_AVAILABLE;
439 else
440 mask = SDHCI_SPACE_AVAILABLE;
441
442 /*
443 * Some controllers (JMicron JMB38x) mess up the buffer bits
444 * for transfers < 4 bytes. As long as it is just one block,
445 * we can ignore the bits.
446 */
447 if ((host->quirks & SDHCI_QUIRK_BROKEN_SMALL_PIO) &&
448 (host->data->blocks == 1))
449 mask = ~0;
450
451 while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) {
452 if (host->quirks & SDHCI_QUIRK_PIO_NEEDS_DELAY)
453 udelay(100);
454
455 if (host->data->flags & MMC_DATA_READ)
456 sdhci_read_block_pio(host);
457 else
458 sdhci_write_block_pio(host);
459
460 host->blocks--;
461 if (host->blocks == 0)
462 break;
463 }
464
465 DBG("PIO transfer complete.\n");
466 }
467
468 static int sdhci_pre_dma_transfer(struct sdhci_host *host,
469 struct mmc_data *data, int cookie)
470 {
471 int sg_count;
472
473 /*
474 * If the data buffers are already mapped, return the previous
475 * dma_map_sg() result.
476 */
477 if (data->host_cookie == COOKIE_PRE_MAPPED)
478 return data->sg_count;
479
480 sg_count = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
481 data->flags & MMC_DATA_WRITE ?
482 DMA_TO_DEVICE : DMA_FROM_DEVICE);
483
484 if (sg_count == 0)
485 return -ENOSPC;
486
487 data->sg_count = sg_count;
488 data->host_cookie = cookie;
489
490 return sg_count;
491 }
492
493 static char *sdhci_kmap_atomic(struct scatterlist *sg, unsigned long *flags)
494 {
495 local_irq_save(*flags);
496 return kmap_atomic(sg_page(sg)) + sg->offset;
497 }
498
499 static void sdhci_kunmap_atomic(void *buffer, unsigned long *flags)
500 {
501 kunmap_atomic(buffer);
502 local_irq_restore(*flags);
503 }
504
505 static void sdhci_adma_write_desc(struct sdhci_host *host, void *desc,
506 dma_addr_t addr, int len, unsigned cmd)
507 {
508 struct sdhci_adma2_64_desc *dma_desc = desc;
509
510 /* 32-bit and 64-bit descriptors have these members in same position */
511 dma_desc->cmd = cpu_to_le16(cmd);
512 dma_desc->len = cpu_to_le16(len);
513 dma_desc->addr_lo = cpu_to_le32((u32)addr);
514
515 if (host->flags & SDHCI_USE_64_BIT_DMA)
516 dma_desc->addr_hi = cpu_to_le32((u64)addr >> 32);
517 }
518
519 static void sdhci_adma_mark_end(void *desc)
520 {
521 struct sdhci_adma2_64_desc *dma_desc = desc;
522
523 /* 32-bit and 64-bit descriptors have 'cmd' in same position */
524 dma_desc->cmd |= cpu_to_le16(ADMA2_END);
525 }
526
527 static void sdhci_adma_table_pre(struct sdhci_host *host,
528 struct mmc_data *data, int sg_count)
529 {
530 struct scatterlist *sg;
531 unsigned long flags;
532 dma_addr_t addr, align_addr;
533 void *desc, *align;
534 char *buffer;
535 int len, offset, i;
536
537 /*
538 * The spec does not specify endianness of descriptor table.
539 * We currently guess that it is LE.
540 */
541
542 host->sg_count = sg_count;
543
544 desc = host->adma_table;
545 align = host->align_buffer;
546
547 align_addr = host->align_addr;
548
549 for_each_sg(data->sg, sg, host->sg_count, i) {
550 addr = sg_dma_address(sg);
551 len = sg_dma_len(sg);
552
553 /*
554 * The SDHCI specification states that ADMA addresses must
555 * be 32-bit aligned. If they aren't, then we use a bounce
556 * buffer for the (up to three) bytes that screw up the
557 * alignment.
558 */
559 offset = (SDHCI_ADMA2_ALIGN - (addr & SDHCI_ADMA2_MASK)) &
560 SDHCI_ADMA2_MASK;
561 if (offset) {
562 if (data->flags & MMC_DATA_WRITE) {
563 buffer = sdhci_kmap_atomic(sg, &flags);
564 memcpy(align, buffer, offset);
565 sdhci_kunmap_atomic(buffer, &flags);
566 }
567
568 /* tran, valid */
569 sdhci_adma_write_desc(host, desc, align_addr, offset,
570 ADMA2_TRAN_VALID);
571
572 BUG_ON(offset > 65536);
573
574 align += SDHCI_ADMA2_ALIGN;
575 align_addr += SDHCI_ADMA2_ALIGN;
576
577 desc += host->desc_sz;
578
579 addr += offset;
580 len -= offset;
581 }
582
583 BUG_ON(len > 65536);
584
585 if (len) {
586 /* tran, valid */
587 sdhci_adma_write_desc(host, desc, addr, len,
588 ADMA2_TRAN_VALID);
589 desc += host->desc_sz;
590 }
591
592 /*
593 * If this triggers then we have a calculation bug
594 * somewhere. :/
595 */
596 WARN_ON((desc - host->adma_table) >= host->adma_table_sz);
597 }
598
599 if (host->quirks & SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC) {
600 /* Mark the last descriptor as the terminating descriptor */
601 if (desc != host->adma_table) {
602 desc -= host->desc_sz;
603 sdhci_adma_mark_end(desc);
604 }
605 } else {
606 /* Add a terminating entry - nop, end, valid */
607 sdhci_adma_write_desc(host, desc, 0, 0, ADMA2_NOP_END_VALID);
608 }
609 }
610
611 static void sdhci_adma_table_post(struct sdhci_host *host,
612 struct mmc_data *data)
613 {
614 struct scatterlist *sg;
615 int i, size;
616 void *align;
617 char *buffer;
618 unsigned long flags;
619
620 if (data->flags & MMC_DATA_READ) {
621 bool has_unaligned = false;
622
623 /* Do a quick scan of the SG list for any unaligned mappings */
624 for_each_sg(data->sg, sg, host->sg_count, i)
625 if (sg_dma_address(sg) & SDHCI_ADMA2_MASK) {
626 has_unaligned = true;
627 break;
628 }
629
630 if (has_unaligned) {
631 dma_sync_sg_for_cpu(mmc_dev(host->mmc), data->sg,
632 data->sg_len, DMA_FROM_DEVICE);
633
634 align = host->align_buffer;
635
636 for_each_sg(data->sg, sg, host->sg_count, i) {
637 if (sg_dma_address(sg) & SDHCI_ADMA2_MASK) {
638 size = SDHCI_ADMA2_ALIGN -
639 (sg_dma_address(sg) & SDHCI_ADMA2_MASK);
640
641 buffer = sdhci_kmap_atomic(sg, &flags);
642 memcpy(buffer, align, size);
643 sdhci_kunmap_atomic(buffer, &flags);
644
645 align += SDHCI_ADMA2_ALIGN;
646 }
647 }
648 }
649 }
650 }
651
652 static u8 sdhci_calc_timeout(struct sdhci_host *host, struct mmc_command *cmd)
653 {
654 u8 count;
655 struct mmc_data *data = cmd->data;
656 unsigned target_timeout, current_timeout;
657
658 /*
659 * If the host controller provides us with an incorrect timeout
660 * value, just skip the check and use 0xE. The hardware may take
661 * longer to time out, but that's much better than having a too-short
662 * timeout value.
663 */
664 if (host->quirks & SDHCI_QUIRK_BROKEN_TIMEOUT_VAL)
665 return 0xE;
666
667 /* Unspecified timeout, assume max */
668 if (!data && !cmd->busy_timeout)
669 return 0xE;
670
671 /* timeout in us */
672 if (!data)
673 target_timeout = cmd->busy_timeout * 1000;
674 else {
675 target_timeout = DIV_ROUND_UP(data->timeout_ns, 1000);
676 if (host->clock && data->timeout_clks) {
677 unsigned long long val;
678
679 /*
680 * data->timeout_clks is in units of clock cycles.
681 * host->clock is in Hz. target_timeout is in us.
682 * Hence, us = 1000000 * cycles / Hz. Round up.
683 */
684 val = 1000000 * data->timeout_clks;
685 if (do_div(val, host->clock))
686 target_timeout++;
687 target_timeout += val;
688 }
689 }
690
691 /*
692 * Figure out needed cycles.
693 * We do this in steps in order to fit inside a 32 bit int.
694 * The first step is the minimum timeout, which will have a
695 * minimum resolution of 6 bits:
696 * (1) 2^13*1000 > 2^22,
697 * (2) host->timeout_clk < 2^16
698 * =>
699 * (1) / (2) > 2^6
700 */
701 count = 0;
702 current_timeout = (1 << 13) * 1000 / host->timeout_clk;
703 while (current_timeout < target_timeout) {
704 count++;
705 current_timeout <<= 1;
706 if (count >= 0xF)
707 break;
708 }
709
710 if (count >= 0xF) {
711 DBG("%s: Too large timeout 0x%x requested for CMD%d!\n",
712 mmc_hostname(host->mmc), count, cmd->opcode);
713 count = 0xE;
714 }
715
716 return count;
717 }
718
719 static void sdhci_set_transfer_irqs(struct sdhci_host *host)
720 {
721 u32 pio_irqs = SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL;
722 u32 dma_irqs = SDHCI_INT_DMA_END | SDHCI_INT_ADMA_ERROR;
723
724 if (host->flags & SDHCI_REQ_USE_DMA)
725 host->ier = (host->ier & ~pio_irqs) | dma_irqs;
726 else
727 host->ier = (host->ier & ~dma_irqs) | pio_irqs;
728
729 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
730 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
731 }
732
733 static void sdhci_set_timeout(struct sdhci_host *host, struct mmc_command *cmd)
734 {
735 u8 count;
736
737 if (host->ops->set_timeout) {
738 host->ops->set_timeout(host, cmd);
739 } else {
740 count = sdhci_calc_timeout(host, cmd);
741 sdhci_writeb(host, count, SDHCI_TIMEOUT_CONTROL);
742 }
743 }
744
745 static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd)
746 {
747 u8 ctrl;
748 struct mmc_data *data = cmd->data;
749
750 WARN_ON(host->data);
751
752 if (data || (cmd->flags & MMC_RSP_BUSY))
753 sdhci_set_timeout(host, cmd);
754
755 if (!data)
756 return;
757
758 /* Sanity checks */
759 BUG_ON(data->blksz * data->blocks > 524288);
760 BUG_ON(data->blksz > host->mmc->max_blk_size);
761 BUG_ON(data->blocks > 65535);
762
763 host->data = data;
764 host->data_early = 0;
765 host->data->bytes_xfered = 0;
766
767 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
768 struct scatterlist *sg;
769 unsigned int length_mask, offset_mask;
770 int i;
771
772 host->flags |= SDHCI_REQ_USE_DMA;
773
774 /*
775 * FIXME: This doesn't account for merging when mapping the
776 * scatterlist.
777 *
778 * The assumption here being that alignment and lengths are
779 * the same after DMA mapping to device address space.
780 */
781 length_mask = 0;
782 offset_mask = 0;
783 if (host->flags & SDHCI_USE_ADMA) {
784 if (host->quirks & SDHCI_QUIRK_32BIT_ADMA_SIZE) {
785 length_mask = 3;
786 /*
787 * As we use up to 3 byte chunks to work
788 * around alignment problems, we need to
789 * check the offset as well.
790 */
791 offset_mask = 3;
792 }
793 } else {
794 if (host->quirks & SDHCI_QUIRK_32BIT_DMA_SIZE)
795 length_mask = 3;
796 if (host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR)
797 offset_mask = 3;
798 }
799
800 if (unlikely(length_mask | offset_mask)) {
801 for_each_sg(data->sg, sg, data->sg_len, i) {
802 if (sg->length & length_mask) {
803 DBG("Reverting to PIO because of transfer size (%d)\n",
804 sg->length);
805 host->flags &= ~SDHCI_REQ_USE_DMA;
806 break;
807 }
808 if (sg->offset & offset_mask) {
809 DBG("Reverting to PIO because of bad alignment\n");
810 host->flags &= ~SDHCI_REQ_USE_DMA;
811 break;
812 }
813 }
814 }
815 }
816
817 if (host->flags & SDHCI_REQ_USE_DMA) {
818 int sg_cnt = sdhci_pre_dma_transfer(host, data, COOKIE_MAPPED);
819
820 if (sg_cnt <= 0) {
821 /*
822 * This only happens when someone fed
823 * us an invalid request.
824 */
825 WARN_ON(1);
826 host->flags &= ~SDHCI_REQ_USE_DMA;
827 } else if (host->flags & SDHCI_USE_ADMA) {
828 sdhci_adma_table_pre(host, data, sg_cnt);
829
830 sdhci_writel(host, host->adma_addr, SDHCI_ADMA_ADDRESS);
831 if (host->flags & SDHCI_USE_64_BIT_DMA)
832 sdhci_writel(host,
833 (u64)host->adma_addr >> 32,
834 SDHCI_ADMA_ADDRESS_HI);
835 } else {
836 WARN_ON(sg_cnt != 1);
837 sdhci_writel(host, sg_dma_address(data->sg),
838 SDHCI_DMA_ADDRESS);
839 }
840 }
841
842 /*
843 * Always adjust the DMA selection as some controllers
844 * (e.g. JMicron) can't do PIO properly when the selection
845 * is ADMA.
846 */
847 if (host->version >= SDHCI_SPEC_200) {
848 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
849 ctrl &= ~SDHCI_CTRL_DMA_MASK;
850 if ((host->flags & SDHCI_REQ_USE_DMA) &&
851 (host->flags & SDHCI_USE_ADMA)) {
852 if (host->flags & SDHCI_USE_64_BIT_DMA)
853 ctrl |= SDHCI_CTRL_ADMA64;
854 else
855 ctrl |= SDHCI_CTRL_ADMA32;
856 } else {
857 ctrl |= SDHCI_CTRL_SDMA;
858 }
859 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
860 }
861
862 if (!(host->flags & SDHCI_REQ_USE_DMA)) {
863 int flags;
864
865 flags = SG_MITER_ATOMIC;
866 if (host->data->flags & MMC_DATA_READ)
867 flags |= SG_MITER_TO_SG;
868 else
869 flags |= SG_MITER_FROM_SG;
870 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
871 host->blocks = data->blocks;
872 }
873
874 sdhci_set_transfer_irqs(host);
875
876 /* Set the DMA boundary value and block size */
877 sdhci_writew(host, SDHCI_MAKE_BLKSZ(SDHCI_DEFAULT_BOUNDARY_ARG,
878 data->blksz), SDHCI_BLOCK_SIZE);
879 sdhci_writew(host, data->blocks, SDHCI_BLOCK_COUNT);
880 }
881
882 static void sdhci_set_transfer_mode(struct sdhci_host *host,
883 struct mmc_command *cmd)
884 {
885 u16 mode = 0;
886 struct mmc_data *data = cmd->data;
887
888 if (data == NULL) {
889 if (host->quirks2 &
890 SDHCI_QUIRK2_CLEAR_TRANSFERMODE_REG_BEFORE_CMD) {
891 sdhci_writew(host, 0x0, SDHCI_TRANSFER_MODE);
892 } else {
893 /* clear Auto CMD settings for no data CMDs */
894 mode = sdhci_readw(host, SDHCI_TRANSFER_MODE);
895 sdhci_writew(host, mode & ~(SDHCI_TRNS_AUTO_CMD12 |
896 SDHCI_TRNS_AUTO_CMD23), SDHCI_TRANSFER_MODE);
897 }
898 return;
899 }
900
901 WARN_ON(!host->data);
902
903 if (!(host->quirks2 & SDHCI_QUIRK2_SUPPORT_SINGLE))
904 mode = SDHCI_TRNS_BLK_CNT_EN;
905
906 if (mmc_op_multi(cmd->opcode) || data->blocks > 1) {
907 mode = SDHCI_TRNS_BLK_CNT_EN | SDHCI_TRNS_MULTI;
908 /*
909 * If we are sending CMD23, CMD12 never gets sent
910 * on successful completion (so no Auto-CMD12).
911 */
912 if (!host->mrq->sbc && (host->flags & SDHCI_AUTO_CMD12) &&
913 (cmd->opcode != SD_IO_RW_EXTENDED))
914 mode |= SDHCI_TRNS_AUTO_CMD12;
915 else if (host->mrq->sbc && (host->flags & SDHCI_AUTO_CMD23)) {
916 mode |= SDHCI_TRNS_AUTO_CMD23;
917 sdhci_writel(host, host->mrq->sbc->arg, SDHCI_ARGUMENT2);
918 }
919 }
920
921 if (data->flags & MMC_DATA_READ)
922 mode |= SDHCI_TRNS_READ;
923 if (host->flags & SDHCI_REQ_USE_DMA)
924 mode |= SDHCI_TRNS_DMA;
925
926 sdhci_writew(host, mode, SDHCI_TRANSFER_MODE);
927 }
928
929 static void sdhci_finish_data(struct sdhci_host *host)
930 {
931 struct mmc_data *data;
932
933 BUG_ON(!host->data);
934
935 data = host->data;
936 host->data = NULL;
937
938 if ((host->flags & (SDHCI_REQ_USE_DMA | SDHCI_USE_ADMA)) ==
939 (SDHCI_REQ_USE_DMA | SDHCI_USE_ADMA))
940 sdhci_adma_table_post(host, data);
941
942 /*
943 * The specification states that the block count register must
944 * be updated, but it does not specify at what point in the
945 * data flow. That makes the register entirely useless to read
946 * back so we have to assume that nothing made it to the card
947 * in the event of an error.
948 */
949 if (data->error)
950 data->bytes_xfered = 0;
951 else
952 data->bytes_xfered = data->blksz * data->blocks;
953
954 /*
955 * Need to send CMD12 if -
956 * a) open-ended multiblock transfer (no CMD23)
957 * b) error in multiblock transfer
958 */
959 if (data->stop &&
960 (data->error ||
961 !host->mrq->sbc)) {
962
963 /*
964 * The controller needs a reset of internal state machines
965 * upon error conditions.
966 */
967 if (data->error) {
968 sdhci_do_reset(host, SDHCI_RESET_CMD);
969 sdhci_do_reset(host, SDHCI_RESET_DATA);
970 }
971
972 sdhci_send_command(host, data->stop);
973 } else
974 tasklet_schedule(&host->finish_tasklet);
975 }
976
977 void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
978 {
979 int flags;
980 u32 mask;
981 unsigned long timeout;
982
983 WARN_ON(host->cmd);
984
985 /* Initially, a command has no error */
986 cmd->error = 0;
987
988 /* Wait max 10 ms */
989 timeout = 10;
990
991 mask = SDHCI_CMD_INHIBIT;
992 if ((cmd->data != NULL) || (cmd->flags & MMC_RSP_BUSY))
993 mask |= SDHCI_DATA_INHIBIT;
994
995 /* We shouldn't wait for data inihibit for stop commands, even
996 though they might use busy signaling */
997 if (host->mrq->data && (cmd == host->mrq->data->stop))
998 mask &= ~SDHCI_DATA_INHIBIT;
999
1000 while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) {
1001 if (timeout == 0) {
1002 pr_err("%s: Controller never released inhibit bit(s).\n",
1003 mmc_hostname(host->mmc));
1004 sdhci_dumpregs(host);
1005 cmd->error = -EIO;
1006 tasklet_schedule(&host->finish_tasklet);
1007 return;
1008 }
1009 timeout--;
1010 mdelay(1);
1011 }
1012
1013 timeout = jiffies;
1014 if (!cmd->data && cmd->busy_timeout > 9000)
1015 timeout += DIV_ROUND_UP(cmd->busy_timeout, 1000) * HZ + HZ;
1016 else
1017 timeout += 10 * HZ;
1018 mod_timer(&host->timer, timeout);
1019
1020 host->cmd = cmd;
1021 host->busy_handle = 0;
1022
1023 sdhci_prepare_data(host, cmd);
1024
1025 sdhci_writel(host, cmd->arg, SDHCI_ARGUMENT);
1026
1027 sdhci_set_transfer_mode(host, cmd);
1028
1029 if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
1030 pr_err("%s: Unsupported response type!\n",
1031 mmc_hostname(host->mmc));
1032 cmd->error = -EINVAL;
1033 tasklet_schedule(&host->finish_tasklet);
1034 return;
1035 }
1036
1037 if (!(cmd->flags & MMC_RSP_PRESENT))
1038 flags = SDHCI_CMD_RESP_NONE;
1039 else if (cmd->flags & MMC_RSP_136)
1040 flags = SDHCI_CMD_RESP_LONG;
1041 else if (cmd->flags & MMC_RSP_BUSY)
1042 flags = SDHCI_CMD_RESP_SHORT_BUSY;
1043 else
1044 flags = SDHCI_CMD_RESP_SHORT;
1045
1046 if (cmd->flags & MMC_RSP_CRC)
1047 flags |= SDHCI_CMD_CRC;
1048 if (cmd->flags & MMC_RSP_OPCODE)
1049 flags |= SDHCI_CMD_INDEX;
1050
1051 /* CMD19 is special in that the Data Present Select should be set */
1052 if (cmd->data || cmd->opcode == MMC_SEND_TUNING_BLOCK ||
1053 cmd->opcode == MMC_SEND_TUNING_BLOCK_HS200)
1054 flags |= SDHCI_CMD_DATA;
1055
1056 sdhci_writew(host, SDHCI_MAKE_CMD(cmd->opcode, flags), SDHCI_COMMAND);
1057 }
1058 EXPORT_SYMBOL_GPL(sdhci_send_command);
1059
1060 static void sdhci_finish_command(struct sdhci_host *host)
1061 {
1062 int i;
1063
1064 BUG_ON(host->cmd == NULL);
1065
1066 if (host->cmd->flags & MMC_RSP_PRESENT) {
1067 if (host->cmd->flags & MMC_RSP_136) {
1068 /* CRC is stripped so we need to do some shifting. */
1069 for (i = 0;i < 4;i++) {
1070 host->cmd->resp[i] = sdhci_readl(host,
1071 SDHCI_RESPONSE + (3-i)*4) << 8;
1072 if (i != 3)
1073 host->cmd->resp[i] |=
1074 sdhci_readb(host,
1075 SDHCI_RESPONSE + (3-i)*4-1);
1076 }
1077 } else {
1078 host->cmd->resp[0] = sdhci_readl(host, SDHCI_RESPONSE);
1079 }
1080 }
1081
1082 /* Finished CMD23, now send actual command. */
1083 if (host->cmd == host->mrq->sbc) {
1084 host->cmd = NULL;
1085 sdhci_send_command(host, host->mrq->cmd);
1086 } else {
1087
1088 /* Processed actual command. */
1089 if (host->data && host->data_early)
1090 sdhci_finish_data(host);
1091
1092 if (!host->cmd->data)
1093 tasklet_schedule(&host->finish_tasklet);
1094
1095 host->cmd = NULL;
1096 }
1097 }
1098
1099 static u16 sdhci_get_preset_value(struct sdhci_host *host)
1100 {
1101 u16 preset = 0;
1102
1103 switch (host->timing) {
1104 case MMC_TIMING_UHS_SDR12:
1105 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR12);
1106 break;
1107 case MMC_TIMING_UHS_SDR25:
1108 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR25);
1109 break;
1110 case MMC_TIMING_UHS_SDR50:
1111 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR50);
1112 break;
1113 case MMC_TIMING_UHS_SDR104:
1114 case MMC_TIMING_MMC_HS200:
1115 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR104);
1116 break;
1117 case MMC_TIMING_UHS_DDR50:
1118 case MMC_TIMING_MMC_DDR52:
1119 preset = sdhci_readw(host, SDHCI_PRESET_FOR_DDR50);
1120 break;
1121 case MMC_TIMING_MMC_HS400:
1122 preset = sdhci_readw(host, SDHCI_PRESET_FOR_HS400);
1123 break;
1124 default:
1125 pr_warn("%s: Invalid UHS-I mode selected\n",
1126 mmc_hostname(host->mmc));
1127 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR12);
1128 break;
1129 }
1130 return preset;
1131 }
1132
1133 u16 sdhci_calc_clk(struct sdhci_host *host, unsigned int clock,
1134 unsigned int *actual_clock)
1135 {
1136 int div = 0; /* Initialized for compiler warning */
1137 int real_div = div, clk_mul = 1;
1138 u16 clk = 0;
1139 bool switch_base_clk = false;
1140
1141 if (host->version >= SDHCI_SPEC_300) {
1142 if (host->preset_enabled) {
1143 u16 pre_val;
1144
1145 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1146 pre_val = sdhci_get_preset_value(host);
1147 div = (pre_val & SDHCI_PRESET_SDCLK_FREQ_MASK)
1148 >> SDHCI_PRESET_SDCLK_FREQ_SHIFT;
1149 if (host->clk_mul &&
1150 (pre_val & SDHCI_PRESET_CLKGEN_SEL_MASK)) {
1151 clk = SDHCI_PROG_CLOCK_MODE;
1152 real_div = div + 1;
1153 clk_mul = host->clk_mul;
1154 } else {
1155 real_div = max_t(int, 1, div << 1);
1156 }
1157 goto clock_set;
1158 }
1159
1160 /*
1161 * Check if the Host Controller supports Programmable Clock
1162 * Mode.
1163 */
1164 if (host->clk_mul) {
1165 for (div = 1; div <= 1024; div++) {
1166 if ((host->max_clk * host->clk_mul / div)
1167 <= clock)
1168 break;
1169 }
1170 if ((host->max_clk * host->clk_mul / div) <= clock) {
1171 /*
1172 * Set Programmable Clock Mode in the Clock
1173 * Control register.
1174 */
1175 clk = SDHCI_PROG_CLOCK_MODE;
1176 real_div = div;
1177 clk_mul = host->clk_mul;
1178 div--;
1179 } else {
1180 /*
1181 * Divisor can be too small to reach clock
1182 * speed requirement. Then use the base clock.
1183 */
1184 switch_base_clk = true;
1185 }
1186 }
1187
1188 if (!host->clk_mul || switch_base_clk) {
1189 /* Version 3.00 divisors must be a multiple of 2. */
1190 if (host->max_clk <= clock)
1191 div = 1;
1192 else {
1193 for (div = 2; div < SDHCI_MAX_DIV_SPEC_300;
1194 div += 2) {
1195 if ((host->max_clk / div) <= clock)
1196 break;
1197 }
1198 }
1199 real_div = div;
1200 div >>= 1;
1201 if ((host->quirks2 & SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN)
1202 && !div && host->max_clk <= 25000000)
1203 div = 1;
1204 }
1205 } else {
1206 /* Version 2.00 divisors must be a power of 2. */
1207 for (div = 1; div < SDHCI_MAX_DIV_SPEC_200; div *= 2) {
1208 if ((host->max_clk / div) <= clock)
1209 break;
1210 }
1211 real_div = div;
1212 div >>= 1;
1213 }
1214
1215 clock_set:
1216 if (real_div)
1217 *actual_clock = (host->max_clk * clk_mul) / real_div;
1218 clk |= (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT;
1219 clk |= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN)
1220 << SDHCI_DIVIDER_HI_SHIFT;
1221
1222 return clk;
1223 }
1224 EXPORT_SYMBOL_GPL(sdhci_calc_clk);
1225
1226 void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
1227 {
1228 u16 clk;
1229 unsigned long timeout;
1230
1231 host->mmc->actual_clock = 0;
1232
1233 sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
1234
1235 if (clock == 0)
1236 return;
1237
1238 clk = sdhci_calc_clk(host, clock, &host->mmc->actual_clock);
1239
1240 clk |= SDHCI_CLOCK_INT_EN;
1241 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1242
1243 /* Wait max 20 ms */
1244 timeout = 20;
1245 while (!((clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL))
1246 & SDHCI_CLOCK_INT_STABLE)) {
1247 if (timeout == 0) {
1248 pr_err("%s: Internal clock never stabilised.\n",
1249 mmc_hostname(host->mmc));
1250 sdhci_dumpregs(host);
1251 return;
1252 }
1253 timeout--;
1254 mdelay(1);
1255 }
1256
1257 clk |= SDHCI_CLOCK_CARD_EN;
1258 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1259 }
1260 EXPORT_SYMBOL_GPL(sdhci_set_clock);
1261
1262 static void sdhci_set_power_reg(struct sdhci_host *host, unsigned char mode,
1263 unsigned short vdd)
1264 {
1265 struct mmc_host *mmc = host->mmc;
1266
1267 spin_unlock_irq(&host->lock);
1268 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
1269 spin_lock_irq(&host->lock);
1270
1271 if (mode != MMC_POWER_OFF)
1272 sdhci_writeb(host, SDHCI_POWER_ON, SDHCI_POWER_CONTROL);
1273 else
1274 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
1275 }
1276
1277 void sdhci_set_power(struct sdhci_host *host, unsigned char mode,
1278 unsigned short vdd)
1279 {
1280 u8 pwr = 0;
1281
1282 if (mode != MMC_POWER_OFF) {
1283 switch (1 << vdd) {
1284 case MMC_VDD_165_195:
1285 pwr = SDHCI_POWER_180;
1286 break;
1287 case MMC_VDD_29_30:
1288 case MMC_VDD_30_31:
1289 pwr = SDHCI_POWER_300;
1290 break;
1291 case MMC_VDD_32_33:
1292 case MMC_VDD_33_34:
1293 pwr = SDHCI_POWER_330;
1294 break;
1295 default:
1296 WARN(1, "%s: Invalid vdd %#x\n",
1297 mmc_hostname(host->mmc), vdd);
1298 break;
1299 }
1300 }
1301
1302 if (host->pwr == pwr)
1303 return;
1304
1305 host->pwr = pwr;
1306
1307 if (pwr == 0) {
1308 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
1309 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
1310 sdhci_runtime_pm_bus_off(host);
1311 } else {
1312 /*
1313 * Spec says that we should clear the power reg before setting
1314 * a new value. Some controllers don't seem to like this though.
1315 */
1316 if (!(host->quirks & SDHCI_QUIRK_SINGLE_POWER_WRITE))
1317 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
1318
1319 /*
1320 * At least the Marvell CaFe chip gets confused if we set the
1321 * voltage and set turn on power at the same time, so set the
1322 * voltage first.
1323 */
1324 if (host->quirks & SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER)
1325 sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
1326
1327 pwr |= SDHCI_POWER_ON;
1328
1329 sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
1330
1331 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
1332 sdhci_runtime_pm_bus_on(host);
1333
1334 /*
1335 * Some controllers need an extra 10ms delay of 10ms before
1336 * they can apply clock after applying power
1337 */
1338 if (host->quirks & SDHCI_QUIRK_DELAY_AFTER_POWER)
1339 mdelay(10);
1340 }
1341 }
1342 EXPORT_SYMBOL_GPL(sdhci_set_power);
1343
1344 static void __sdhci_set_power(struct sdhci_host *host, unsigned char mode,
1345 unsigned short vdd)
1346 {
1347 struct mmc_host *mmc = host->mmc;
1348
1349 if (host->ops->set_power)
1350 host->ops->set_power(host, mode, vdd);
1351 else if (!IS_ERR(mmc->supply.vmmc))
1352 sdhci_set_power_reg(host, mode, vdd);
1353 else
1354 sdhci_set_power(host, mode, vdd);
1355 }
1356
1357 /*****************************************************************************\
1358 * *
1359 * MMC callbacks *
1360 * *
1361 \*****************************************************************************/
1362
1363 static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
1364 {
1365 struct sdhci_host *host;
1366 int present;
1367 unsigned long flags;
1368
1369 host = mmc_priv(mmc);
1370
1371 /* Firstly check card presence */
1372 present = mmc->ops->get_cd(mmc);
1373
1374 spin_lock_irqsave(&host->lock, flags);
1375
1376 WARN_ON(host->mrq != NULL);
1377
1378 sdhci_led_activate(host);
1379
1380 /*
1381 * Ensure we don't send the STOP for non-SET_BLOCK_COUNTED
1382 * requests if Auto-CMD12 is enabled.
1383 */
1384 if (!mrq->sbc && (host->flags & SDHCI_AUTO_CMD12)) {
1385 if (mrq->stop) {
1386 mrq->data->stop = NULL;
1387 mrq->stop = NULL;
1388 }
1389 }
1390
1391 host->mrq = mrq;
1392
1393 if (!present || host->flags & SDHCI_DEVICE_DEAD) {
1394 host->mrq->cmd->error = -ENOMEDIUM;
1395 tasklet_schedule(&host->finish_tasklet);
1396 } else {
1397 if (mrq->sbc && !(host->flags & SDHCI_AUTO_CMD23))
1398 sdhci_send_command(host, mrq->sbc);
1399 else
1400 sdhci_send_command(host, mrq->cmd);
1401 }
1402
1403 mmiowb();
1404 spin_unlock_irqrestore(&host->lock, flags);
1405 }
1406
1407 void sdhci_set_bus_width(struct sdhci_host *host, int width)
1408 {
1409 u8 ctrl;
1410
1411 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
1412 if (width == MMC_BUS_WIDTH_8) {
1413 ctrl &= ~SDHCI_CTRL_4BITBUS;
1414 if (host->version >= SDHCI_SPEC_300)
1415 ctrl |= SDHCI_CTRL_8BITBUS;
1416 } else {
1417 if (host->version >= SDHCI_SPEC_300)
1418 ctrl &= ~SDHCI_CTRL_8BITBUS;
1419 if (width == MMC_BUS_WIDTH_4)
1420 ctrl |= SDHCI_CTRL_4BITBUS;
1421 else
1422 ctrl &= ~SDHCI_CTRL_4BITBUS;
1423 }
1424 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1425 }
1426 EXPORT_SYMBOL_GPL(sdhci_set_bus_width);
1427
1428 void sdhci_set_uhs_signaling(struct sdhci_host *host, unsigned timing)
1429 {
1430 u16 ctrl_2;
1431
1432 ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1433 /* Select Bus Speed Mode for host */
1434 ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
1435 if ((timing == MMC_TIMING_MMC_HS200) ||
1436 (timing == MMC_TIMING_UHS_SDR104))
1437 ctrl_2 |= SDHCI_CTRL_UHS_SDR104;
1438 else if (timing == MMC_TIMING_UHS_SDR12)
1439 ctrl_2 |= SDHCI_CTRL_UHS_SDR12;
1440 else if (timing == MMC_TIMING_UHS_SDR25)
1441 ctrl_2 |= SDHCI_CTRL_UHS_SDR25;
1442 else if (timing == MMC_TIMING_UHS_SDR50)
1443 ctrl_2 |= SDHCI_CTRL_UHS_SDR50;
1444 else if ((timing == MMC_TIMING_UHS_DDR50) ||
1445 (timing == MMC_TIMING_MMC_DDR52))
1446 ctrl_2 |= SDHCI_CTRL_UHS_DDR50;
1447 else if (timing == MMC_TIMING_MMC_HS400)
1448 ctrl_2 |= SDHCI_CTRL_HS400; /* Non-standard */
1449 sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
1450 }
1451 EXPORT_SYMBOL_GPL(sdhci_set_uhs_signaling);
1452
1453 static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1454 {
1455 struct sdhci_host *host = mmc_priv(mmc);
1456 unsigned long flags;
1457 u8 ctrl;
1458
1459 spin_lock_irqsave(&host->lock, flags);
1460
1461 if (host->flags & SDHCI_DEVICE_DEAD) {
1462 spin_unlock_irqrestore(&host->lock, flags);
1463 if (!IS_ERR(mmc->supply.vmmc) &&
1464 ios->power_mode == MMC_POWER_OFF)
1465 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
1466 return;
1467 }
1468
1469 /*
1470 * Reset the chip on each power off.
1471 * Should clear out any weird states.
1472 */
1473 if (ios->power_mode == MMC_POWER_OFF) {
1474 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
1475 sdhci_reinit(host);
1476 }
1477
1478 if (host->version >= SDHCI_SPEC_300 &&
1479 (ios->power_mode == MMC_POWER_UP) &&
1480 !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN))
1481 sdhci_enable_preset_value(host, false);
1482
1483 if (!ios->clock || ios->clock != host->clock) {
1484 host->ops->set_clock(host, ios->clock);
1485 host->clock = ios->clock;
1486
1487 if (host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK &&
1488 host->clock) {
1489 host->timeout_clk = host->mmc->actual_clock ?
1490 host->mmc->actual_clock / 1000 :
1491 host->clock / 1000;
1492 host->mmc->max_busy_timeout =
1493 host->ops->get_max_timeout_count ?
1494 host->ops->get_max_timeout_count(host) :
1495 1 << 27;
1496 host->mmc->max_busy_timeout /= host->timeout_clk;
1497 }
1498 }
1499
1500 __sdhci_set_power(host, ios->power_mode, ios->vdd);
1501
1502 if (host->ops->platform_send_init_74_clocks)
1503 host->ops->platform_send_init_74_clocks(host, ios->power_mode);
1504
1505 host->ops->set_bus_width(host, ios->bus_width);
1506
1507 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
1508
1509 if ((ios->timing == MMC_TIMING_SD_HS ||
1510 ios->timing == MMC_TIMING_MMC_HS)
1511 && !(host->quirks & SDHCI_QUIRK_NO_HISPD_BIT))
1512 ctrl |= SDHCI_CTRL_HISPD;
1513 else
1514 ctrl &= ~SDHCI_CTRL_HISPD;
1515
1516 if (host->version >= SDHCI_SPEC_300) {
1517 u16 clk, ctrl_2;
1518
1519 /* In case of UHS-I modes, set High Speed Enable */
1520 if ((ios->timing == MMC_TIMING_MMC_HS400) ||
1521 (ios->timing == MMC_TIMING_MMC_HS200) ||
1522 (ios->timing == MMC_TIMING_MMC_DDR52) ||
1523 (ios->timing == MMC_TIMING_UHS_SDR50) ||
1524 (ios->timing == MMC_TIMING_UHS_SDR104) ||
1525 (ios->timing == MMC_TIMING_UHS_DDR50) ||
1526 (ios->timing == MMC_TIMING_UHS_SDR25))
1527 ctrl |= SDHCI_CTRL_HISPD;
1528
1529 if (!host->preset_enabled) {
1530 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1531 /*
1532 * We only need to set Driver Strength if the
1533 * preset value enable is not set.
1534 */
1535 ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1536 ctrl_2 &= ~SDHCI_CTRL_DRV_TYPE_MASK;
1537 if (ios->drv_type == MMC_SET_DRIVER_TYPE_A)
1538 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_A;
1539 else if (ios->drv_type == MMC_SET_DRIVER_TYPE_B)
1540 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_B;
1541 else if (ios->drv_type == MMC_SET_DRIVER_TYPE_C)
1542 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_C;
1543 else if (ios->drv_type == MMC_SET_DRIVER_TYPE_D)
1544 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_D;
1545 else {
1546 pr_warn("%s: invalid driver type, default to driver type B\n",
1547 mmc_hostname(mmc));
1548 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_B;
1549 }
1550
1551 sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
1552 } else {
1553 /*
1554 * According to SDHC Spec v3.00, if the Preset Value
1555 * Enable in the Host Control 2 register is set, we
1556 * need to reset SD Clock Enable before changing High
1557 * Speed Enable to avoid generating clock gliches.
1558 */
1559
1560 /* Reset SD Clock Enable */
1561 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1562 clk &= ~SDHCI_CLOCK_CARD_EN;
1563 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1564
1565 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1566
1567 /* Re-enable SD Clock */
1568 host->ops->set_clock(host, host->clock);
1569 }
1570
1571 /* Reset SD Clock Enable */
1572 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1573 clk &= ~SDHCI_CLOCK_CARD_EN;
1574 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1575
1576 host->ops->set_uhs_signaling(host, ios->timing);
1577 host->timing = ios->timing;
1578
1579 if (!(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN) &&
1580 ((ios->timing == MMC_TIMING_UHS_SDR12) ||
1581 (ios->timing == MMC_TIMING_UHS_SDR25) ||
1582 (ios->timing == MMC_TIMING_UHS_SDR50) ||
1583 (ios->timing == MMC_TIMING_UHS_SDR104) ||
1584 (ios->timing == MMC_TIMING_UHS_DDR50) ||
1585 (ios->timing == MMC_TIMING_MMC_DDR52))) {
1586 u16 preset;
1587
1588 sdhci_enable_preset_value(host, true);
1589 preset = sdhci_get_preset_value(host);
1590 ios->drv_type = (preset & SDHCI_PRESET_DRV_MASK)
1591 >> SDHCI_PRESET_DRV_SHIFT;
1592 }
1593
1594 /* Re-enable SD Clock */
1595 host->ops->set_clock(host, host->clock);
1596 } else
1597 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1598
1599 /*
1600 * Some (ENE) controllers go apeshit on some ios operation,
1601 * signalling timeout and CRC errors even on CMD0. Resetting
1602 * it on each ios seems to solve the problem.
1603 */
1604 if (host->quirks & SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS)
1605 sdhci_do_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
1606
1607 mmiowb();
1608 spin_unlock_irqrestore(&host->lock, flags);
1609 }
1610
1611 static int sdhci_get_cd(struct mmc_host *mmc)
1612 {
1613 struct sdhci_host *host = mmc_priv(mmc);
1614 int gpio_cd = mmc_gpio_get_cd(mmc);
1615
1616 if (host->flags & SDHCI_DEVICE_DEAD)
1617 return 0;
1618
1619 /* If nonremovable, assume that the card is always present. */
1620 if (host->mmc->caps & MMC_CAP_NONREMOVABLE)
1621 return 1;
1622
1623 /*
1624 * Try slot gpio detect, if defined it take precedence
1625 * over build in controller functionality
1626 */
1627 if (gpio_cd >= 0)
1628 return !!gpio_cd;
1629
1630 /* If polling, assume that the card is always present. */
1631 if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
1632 return 1;
1633
1634 /* Host native card detect */
1635 return !!(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT);
1636 }
1637
1638 static int sdhci_check_ro(struct sdhci_host *host)
1639 {
1640 unsigned long flags;
1641 int is_readonly;
1642
1643 spin_lock_irqsave(&host->lock, flags);
1644
1645 if (host->flags & SDHCI_DEVICE_DEAD)
1646 is_readonly = 0;
1647 else if (host->ops->get_ro)
1648 is_readonly = host->ops->get_ro(host);
1649 else
1650 is_readonly = !(sdhci_readl(host, SDHCI_PRESENT_STATE)
1651 & SDHCI_WRITE_PROTECT);
1652
1653 spin_unlock_irqrestore(&host->lock, flags);
1654
1655 /* This quirk needs to be replaced by a callback-function later */
1656 return host->quirks & SDHCI_QUIRK_INVERTED_WRITE_PROTECT ?
1657 !is_readonly : is_readonly;
1658 }
1659
1660 #define SAMPLE_COUNT 5
1661
1662 static int sdhci_get_ro(struct mmc_host *mmc)
1663 {
1664 struct sdhci_host *host = mmc_priv(mmc);
1665 int i, ro_count;
1666
1667 if (!(host->quirks & SDHCI_QUIRK_UNSTABLE_RO_DETECT))
1668 return sdhci_check_ro(host);
1669
1670 ro_count = 0;
1671 for (i = 0; i < SAMPLE_COUNT; i++) {
1672 if (sdhci_check_ro(host)) {
1673 if (++ro_count > SAMPLE_COUNT / 2)
1674 return 1;
1675 }
1676 msleep(30);
1677 }
1678 return 0;
1679 }
1680
1681 static void sdhci_hw_reset(struct mmc_host *mmc)
1682 {
1683 struct sdhci_host *host = mmc_priv(mmc);
1684
1685 if (host->ops && host->ops->hw_reset)
1686 host->ops->hw_reset(host);
1687 }
1688
1689 static void sdhci_enable_sdio_irq_nolock(struct sdhci_host *host, int enable)
1690 {
1691 if (!(host->flags & SDHCI_DEVICE_DEAD)) {
1692 if (enable)
1693 host->ier |= SDHCI_INT_CARD_INT;
1694 else
1695 host->ier &= ~SDHCI_INT_CARD_INT;
1696
1697 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
1698 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
1699 mmiowb();
1700 }
1701 }
1702
1703 static void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable)
1704 {
1705 struct sdhci_host *host = mmc_priv(mmc);
1706 unsigned long flags;
1707
1708 spin_lock_irqsave(&host->lock, flags);
1709 if (enable)
1710 host->flags |= SDHCI_SDIO_IRQ_ENABLED;
1711 else
1712 host->flags &= ~SDHCI_SDIO_IRQ_ENABLED;
1713
1714 sdhci_enable_sdio_irq_nolock(host, enable);
1715 spin_unlock_irqrestore(&host->lock, flags);
1716 }
1717
1718 static int sdhci_start_signal_voltage_switch(struct mmc_host *mmc,
1719 struct mmc_ios *ios)
1720 {
1721 struct sdhci_host *host = mmc_priv(mmc);
1722 u16 ctrl;
1723 int ret;
1724
1725 /*
1726 * Signal Voltage Switching is only applicable for Host Controllers
1727 * v3.00 and above.
1728 */
1729 if (host->version < SDHCI_SPEC_300)
1730 return 0;
1731
1732 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1733
1734 switch (ios->signal_voltage) {
1735 case MMC_SIGNAL_VOLTAGE_330:
1736 /* Set 1.8V Signal Enable in the Host Control2 register to 0 */
1737 ctrl &= ~SDHCI_CTRL_VDD_180;
1738 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1739
1740 if (!IS_ERR(mmc->supply.vqmmc)) {
1741 ret = regulator_set_voltage(mmc->supply.vqmmc, 2700000,
1742 3600000);
1743 if (ret) {
1744 pr_warn("%s: Switching to 3.3V signalling voltage failed\n",
1745 mmc_hostname(mmc));
1746 return -EIO;
1747 }
1748 }
1749 /* Wait for 5ms */
1750 usleep_range(5000, 5500);
1751
1752 /* 3.3V regulator output should be stable within 5 ms */
1753 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1754 if (!(ctrl & SDHCI_CTRL_VDD_180))
1755 return 0;
1756
1757 pr_warn("%s: 3.3V regulator output did not became stable\n",
1758 mmc_hostname(mmc));
1759
1760 return -EAGAIN;
1761 case MMC_SIGNAL_VOLTAGE_180:
1762 if (!IS_ERR(mmc->supply.vqmmc)) {
1763 ret = regulator_set_voltage(mmc->supply.vqmmc,
1764 1700000, 1950000);
1765 if (ret) {
1766 pr_warn("%s: Switching to 1.8V signalling voltage failed\n",
1767 mmc_hostname(mmc));
1768 return -EIO;
1769 }
1770 }
1771
1772 /*
1773 * Enable 1.8V Signal Enable in the Host Control2
1774 * register
1775 */
1776 ctrl |= SDHCI_CTRL_VDD_180;
1777 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1778
1779 /* Some controller need to do more when switching */
1780 if (host->ops->voltage_switch)
1781 host->ops->voltage_switch(host);
1782
1783 /* 1.8V regulator output should be stable within 5 ms */
1784 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1785 if (ctrl & SDHCI_CTRL_VDD_180)
1786 return 0;
1787
1788 pr_warn("%s: 1.8V regulator output did not became stable\n",
1789 mmc_hostname(mmc));
1790
1791 return -EAGAIN;
1792 case MMC_SIGNAL_VOLTAGE_120:
1793 if (!IS_ERR(mmc->supply.vqmmc)) {
1794 ret = regulator_set_voltage(mmc->supply.vqmmc, 1100000,
1795 1300000);
1796 if (ret) {
1797 pr_warn("%s: Switching to 1.2V signalling voltage failed\n",
1798 mmc_hostname(mmc));
1799 return -EIO;
1800 }
1801 }
1802 return 0;
1803 default:
1804 /* No signal voltage switch required */
1805 return 0;
1806 }
1807 }
1808
1809 static int sdhci_card_busy(struct mmc_host *mmc)
1810 {
1811 struct sdhci_host *host = mmc_priv(mmc);
1812 u32 present_state;
1813
1814 /* Check whether DAT[3:0] is 0000 */
1815 present_state = sdhci_readl(host, SDHCI_PRESENT_STATE);
1816
1817 return !(present_state & SDHCI_DATA_LVL_MASK);
1818 }
1819
1820 static int sdhci_prepare_hs400_tuning(struct mmc_host *mmc, struct mmc_ios *ios)
1821 {
1822 struct sdhci_host *host = mmc_priv(mmc);
1823 unsigned long flags;
1824
1825 spin_lock_irqsave(&host->lock, flags);
1826 host->flags |= SDHCI_HS400_TUNING;
1827 spin_unlock_irqrestore(&host->lock, flags);
1828
1829 return 0;
1830 }
1831
1832 static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
1833 {
1834 struct sdhci_host *host = mmc_priv(mmc);
1835 u16 ctrl;
1836 int tuning_loop_counter = MAX_TUNING_LOOP;
1837 int err = 0;
1838 unsigned long flags;
1839 unsigned int tuning_count = 0;
1840 bool hs400_tuning;
1841
1842 spin_lock_irqsave(&host->lock, flags);
1843
1844 hs400_tuning = host->flags & SDHCI_HS400_TUNING;
1845 host->flags &= ~SDHCI_HS400_TUNING;
1846
1847 if (host->tuning_mode == SDHCI_TUNING_MODE_1)
1848 tuning_count = host->tuning_count;
1849
1850 /*
1851 * The Host Controller needs tuning in case of SDR104 and DDR50
1852 * mode, and for SDR50 mode when Use Tuning for SDR50 is set in
1853 * the Capabilities register.
1854 * If the Host Controller supports the HS200 mode then the
1855 * tuning function has to be executed.
1856 */
1857 switch (host->timing) {
1858 /* HS400 tuning is done in HS200 mode */
1859 case MMC_TIMING_MMC_HS400:
1860 err = -EINVAL;
1861 goto out_unlock;
1862
1863 case MMC_TIMING_MMC_HS200:
1864 /*
1865 * Periodic re-tuning for HS400 is not expected to be needed, so
1866 * disable it here.
1867 */
1868 if (hs400_tuning)
1869 tuning_count = 0;
1870 break;
1871
1872 case MMC_TIMING_UHS_SDR104:
1873 case MMC_TIMING_UHS_DDR50:
1874 break;
1875
1876 case MMC_TIMING_UHS_SDR50:
1877 if (host->flags & SDHCI_SDR50_NEEDS_TUNING)
1878 break;
1879 /* FALLTHROUGH */
1880
1881 default:
1882 goto out_unlock;
1883 }
1884
1885 if (host->ops->platform_execute_tuning) {
1886 spin_unlock_irqrestore(&host->lock, flags);
1887 err = host->ops->platform_execute_tuning(host, opcode);
1888 return err;
1889 }
1890
1891 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1892 ctrl |= SDHCI_CTRL_EXEC_TUNING;
1893 if (host->quirks2 & SDHCI_QUIRK2_TUNING_WORK_AROUND)
1894 ctrl |= SDHCI_CTRL_TUNED_CLK;
1895 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1896
1897 /*
1898 * As per the Host Controller spec v3.00, tuning command
1899 * generates Buffer Read Ready interrupt, so enable that.
1900 *
1901 * Note: The spec clearly says that when tuning sequence
1902 * is being performed, the controller does not generate
1903 * interrupts other than Buffer Read Ready interrupt. But
1904 * to make sure we don't hit a controller bug, we _only_
1905 * enable Buffer Read Ready interrupt here.
1906 */
1907 sdhci_writel(host, SDHCI_INT_DATA_AVAIL, SDHCI_INT_ENABLE);
1908 sdhci_writel(host, SDHCI_INT_DATA_AVAIL, SDHCI_SIGNAL_ENABLE);
1909
1910 /*
1911 * Issue CMD19 repeatedly till Execute Tuning is set to 0 or the number
1912 * of loops reaches 40 times or a timeout of 150ms occurs.
1913 */
1914 do {
1915 struct mmc_command cmd = {0};
1916 struct mmc_request mrq = {NULL};
1917
1918 cmd.opcode = opcode;
1919 cmd.arg = 0;
1920 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
1921 cmd.retries = 0;
1922 cmd.data = NULL;
1923 cmd.error = 0;
1924
1925 if (tuning_loop_counter-- == 0)
1926 break;
1927
1928 mrq.cmd = &cmd;
1929 host->mrq = &mrq;
1930
1931 /*
1932 * In response to CMD19, the card sends 64 bytes of tuning
1933 * block to the Host Controller. So we set the block size
1934 * to 64 here.
1935 */
1936 if (cmd.opcode == MMC_SEND_TUNING_BLOCK_HS200) {
1937 if (mmc->ios.bus_width == MMC_BUS_WIDTH_8)
1938 sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, 128),
1939 SDHCI_BLOCK_SIZE);
1940 else if (mmc->ios.bus_width == MMC_BUS_WIDTH_4)
1941 sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, 64),
1942 SDHCI_BLOCK_SIZE);
1943 } else {
1944 sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, 64),
1945 SDHCI_BLOCK_SIZE);
1946 }
1947
1948 /*
1949 * The tuning block is sent by the card to the host controller.
1950 * So we set the TRNS_READ bit in the Transfer Mode register.
1951 * This also takes care of setting DMA Enable and Multi Block
1952 * Select in the same register to 0.
1953 */
1954 sdhci_writew(host, SDHCI_TRNS_READ, SDHCI_TRANSFER_MODE);
1955
1956 sdhci_send_command(host, &cmd);
1957
1958 host->cmd = NULL;
1959 host->mrq = NULL;
1960
1961 spin_unlock_irqrestore(&host->lock, flags);
1962 /* Wait for Buffer Read Ready interrupt */
1963 wait_event_interruptible_timeout(host->buf_ready_int,
1964 (host->tuning_done == 1),
1965 msecs_to_jiffies(50));
1966 spin_lock_irqsave(&host->lock, flags);
1967
1968 if (!host->tuning_done) {
1969 pr_info(DRIVER_NAME ": Timeout waiting for Buffer Read Ready interrupt during tuning procedure, falling back to fixed sampling clock\n");
1970 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1971 ctrl &= ~SDHCI_CTRL_TUNED_CLK;
1972 ctrl &= ~SDHCI_CTRL_EXEC_TUNING;
1973 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1974
1975 err = -EIO;
1976 goto out;
1977 }
1978
1979 host->tuning_done = 0;
1980
1981 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1982
1983 /* eMMC spec does not require a delay between tuning cycles */
1984 if (opcode == MMC_SEND_TUNING_BLOCK)
1985 mdelay(1);
1986 } while (ctrl & SDHCI_CTRL_EXEC_TUNING);
1987
1988 /*
1989 * The Host Driver has exhausted the maximum number of loops allowed,
1990 * so use fixed sampling frequency.
1991 */
1992 if (tuning_loop_counter < 0) {
1993 ctrl &= ~SDHCI_CTRL_TUNED_CLK;
1994 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1995 }
1996 if (!(ctrl & SDHCI_CTRL_TUNED_CLK)) {
1997 pr_info(DRIVER_NAME ": Tuning procedure failed, falling back to fixed sampling clock\n");
1998 err = -EIO;
1999 }
2000
2001 out:
2002 if (tuning_count) {
2003 /*
2004 * In case tuning fails, host controllers which support
2005 * re-tuning can try tuning again at a later time, when the
2006 * re-tuning timer expires. So for these controllers, we
2007 * return 0. Since there might be other controllers who do not
2008 * have this capability, we return error for them.
2009 */
2010 err = 0;
2011 }
2012
2013 host->mmc->retune_period = err ? 0 : tuning_count;
2014
2015 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
2016 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
2017 out_unlock:
2018 spin_unlock_irqrestore(&host->lock, flags);
2019 return err;
2020 }
2021
2022 static int sdhci_select_drive_strength(struct mmc_card *card,
2023 unsigned int max_dtr, int host_drv,
2024 int card_drv, int *drv_type)
2025 {
2026 struct sdhci_host *host = mmc_priv(card->host);
2027
2028 if (!host->ops->select_drive_strength)
2029 return 0;
2030
2031 return host->ops->select_drive_strength(host, card, max_dtr, host_drv,
2032 card_drv, drv_type);
2033 }
2034
2035 static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable)
2036 {
2037 /* Host Controller v3.00 defines preset value registers */
2038 if (host->version < SDHCI_SPEC_300)
2039 return;
2040
2041 /*
2042 * We only enable or disable Preset Value if they are not already
2043 * enabled or disabled respectively. Otherwise, we bail out.
2044 */
2045 if (host->preset_enabled != enable) {
2046 u16 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2047
2048 if (enable)
2049 ctrl |= SDHCI_CTRL_PRESET_VAL_ENABLE;
2050 else
2051 ctrl &= ~SDHCI_CTRL_PRESET_VAL_ENABLE;
2052
2053 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2054
2055 if (enable)
2056 host->flags |= SDHCI_PV_ENABLED;
2057 else
2058 host->flags &= ~SDHCI_PV_ENABLED;
2059
2060 host->preset_enabled = enable;
2061 }
2062 }
2063
2064 static void sdhci_post_req(struct mmc_host *mmc, struct mmc_request *mrq,
2065 int err)
2066 {
2067 struct sdhci_host *host = mmc_priv(mmc);
2068 struct mmc_data *data = mrq->data;
2069
2070 if (data->host_cookie != COOKIE_UNMAPPED)
2071 dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
2072 data->flags & MMC_DATA_WRITE ?
2073 DMA_TO_DEVICE : DMA_FROM_DEVICE);
2074
2075 data->host_cookie = COOKIE_UNMAPPED;
2076 }
2077
2078 static void sdhci_pre_req(struct mmc_host *mmc, struct mmc_request *mrq,
2079 bool is_first_req)
2080 {
2081 struct sdhci_host *host = mmc_priv(mmc);
2082
2083 mrq->data->host_cookie = COOKIE_UNMAPPED;
2084
2085 if (host->flags & SDHCI_REQ_USE_DMA)
2086 sdhci_pre_dma_transfer(host, mrq->data, COOKIE_PRE_MAPPED);
2087 }
2088
2089 static void sdhci_card_event(struct mmc_host *mmc)
2090 {
2091 struct sdhci_host *host = mmc_priv(mmc);
2092 unsigned long flags;
2093 int present;
2094
2095 /* First check if client has provided their own card event */
2096 if (host->ops->card_event)
2097 host->ops->card_event(host);
2098
2099 present = sdhci_get_cd(host->mmc);
2100
2101 spin_lock_irqsave(&host->lock, flags);
2102
2103 /* Check host->mrq first in case we are runtime suspended */
2104 if (host->mrq && !present) {
2105 pr_err("%s: Card removed during transfer!\n",
2106 mmc_hostname(host->mmc));
2107 pr_err("%s: Resetting controller.\n",
2108 mmc_hostname(host->mmc));
2109
2110 sdhci_do_reset(host, SDHCI_RESET_CMD);
2111 sdhci_do_reset(host, SDHCI_RESET_DATA);
2112
2113 host->mrq->cmd->error = -ENOMEDIUM;
2114 tasklet_schedule(&host->finish_tasklet);
2115 }
2116
2117 spin_unlock_irqrestore(&host->lock, flags);
2118 }
2119
2120 static const struct mmc_host_ops sdhci_ops = {
2121 .request = sdhci_request,
2122 .post_req = sdhci_post_req,
2123 .pre_req = sdhci_pre_req,
2124 .set_ios = sdhci_set_ios,
2125 .get_cd = sdhci_get_cd,
2126 .get_ro = sdhci_get_ro,
2127 .hw_reset = sdhci_hw_reset,
2128 .enable_sdio_irq = sdhci_enable_sdio_irq,
2129 .start_signal_voltage_switch = sdhci_start_signal_voltage_switch,
2130 .prepare_hs400_tuning = sdhci_prepare_hs400_tuning,
2131 .execute_tuning = sdhci_execute_tuning,
2132 .select_drive_strength = sdhci_select_drive_strength,
2133 .card_event = sdhci_card_event,
2134 .card_busy = sdhci_card_busy,
2135 };
2136
2137 /*****************************************************************************\
2138 * *
2139 * Tasklets *
2140 * *
2141 \*****************************************************************************/
2142
2143 static void sdhci_tasklet_finish(unsigned long param)
2144 {
2145 struct sdhci_host *host;
2146 unsigned long flags;
2147 struct mmc_request *mrq;
2148
2149 host = (struct sdhci_host*)param;
2150
2151 spin_lock_irqsave(&host->lock, flags);
2152
2153 /*
2154 * If this tasklet gets rescheduled while running, it will
2155 * be run again afterwards but without any active request.
2156 */
2157 if (!host->mrq) {
2158 spin_unlock_irqrestore(&host->lock, flags);
2159 return;
2160 }
2161
2162 del_timer(&host->timer);
2163
2164 mrq = host->mrq;
2165
2166 /*
2167 * Always unmap the data buffers if they were mapped by
2168 * sdhci_prepare_data() whenever we finish with a request.
2169 * This avoids leaking DMA mappings on error.
2170 */
2171 if (host->flags & SDHCI_REQ_USE_DMA) {
2172 struct mmc_data *data = mrq->data;
2173
2174 if (data && data->host_cookie == COOKIE_MAPPED) {
2175 dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
2176 (data->flags & MMC_DATA_READ) ?
2177 DMA_FROM_DEVICE : DMA_TO_DEVICE);
2178 data->host_cookie = COOKIE_UNMAPPED;
2179 }
2180 }
2181
2182 /*
2183 * The controller needs a reset of internal state machines
2184 * upon error conditions.
2185 */
2186 if (!(host->flags & SDHCI_DEVICE_DEAD) &&
2187 ((mrq->cmd && mrq->cmd->error) ||
2188 (mrq->sbc && mrq->sbc->error) ||
2189 (mrq->data && ((mrq->data->error && !mrq->data->stop) ||
2190 (mrq->data->stop && mrq->data->stop->error))) ||
2191 (host->quirks & SDHCI_QUIRK_RESET_AFTER_REQUEST))) {
2192
2193 /* Some controllers need this kick or reset won't work here */
2194 if (host->quirks & SDHCI_QUIRK_CLOCK_BEFORE_RESET)
2195 /* This is to force an update */
2196 host->ops->set_clock(host, host->clock);
2197
2198 /* Spec says we should do both at the same time, but Ricoh
2199 controllers do not like that. */
2200 sdhci_do_reset(host, SDHCI_RESET_CMD);
2201 sdhci_do_reset(host, SDHCI_RESET_DATA);
2202 }
2203
2204 host->mrq = NULL;
2205 host->cmd = NULL;
2206 host->data = NULL;
2207
2208 sdhci_led_deactivate(host);
2209
2210 mmiowb();
2211 spin_unlock_irqrestore(&host->lock, flags);
2212
2213 mmc_request_done(host->mmc, mrq);
2214 }
2215
2216 static void sdhci_timeout_timer(unsigned long data)
2217 {
2218 struct sdhci_host *host;
2219 unsigned long flags;
2220
2221 host = (struct sdhci_host*)data;
2222
2223 spin_lock_irqsave(&host->lock, flags);
2224
2225 if (host->mrq) {
2226 pr_err("%s: Timeout waiting for hardware interrupt.\n",
2227 mmc_hostname(host->mmc));
2228 sdhci_dumpregs(host);
2229
2230 if (host->data) {
2231 host->data->error = -ETIMEDOUT;
2232 sdhci_finish_data(host);
2233 } else {
2234 if (host->cmd)
2235 host->cmd->error = -ETIMEDOUT;
2236 else
2237 host->mrq->cmd->error = -ETIMEDOUT;
2238
2239 tasklet_schedule(&host->finish_tasklet);
2240 }
2241 }
2242
2243 mmiowb();
2244 spin_unlock_irqrestore(&host->lock, flags);
2245 }
2246
2247 /*****************************************************************************\
2248 * *
2249 * Interrupt handling *
2250 * *
2251 \*****************************************************************************/
2252
2253 static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask, u32 *mask)
2254 {
2255 BUG_ON(intmask == 0);
2256
2257 if (!host->cmd) {
2258 pr_err("%s: Got command interrupt 0x%08x even though no command operation was in progress.\n",
2259 mmc_hostname(host->mmc), (unsigned)intmask);
2260 sdhci_dumpregs(host);
2261 return;
2262 }
2263
2264 if (intmask & (SDHCI_INT_TIMEOUT | SDHCI_INT_CRC |
2265 SDHCI_INT_END_BIT | SDHCI_INT_INDEX)) {
2266 if (intmask & SDHCI_INT_TIMEOUT)
2267 host->cmd->error = -ETIMEDOUT;
2268 else
2269 host->cmd->error = -EILSEQ;
2270
2271 /*
2272 * If this command initiates a data phase and a response
2273 * CRC error is signalled, the card can start transferring
2274 * data - the card may have received the command without
2275 * error. We must not terminate the mmc_request early.
2276 *
2277 * If the card did not receive the command or returned an
2278 * error which prevented it sending data, the data phase
2279 * will time out.
2280 */
2281 if (host->cmd->data &&
2282 (intmask & (SDHCI_INT_CRC | SDHCI_INT_TIMEOUT)) ==
2283 SDHCI_INT_CRC) {
2284 host->cmd = NULL;
2285 return;
2286 }
2287
2288 tasklet_schedule(&host->finish_tasklet);
2289 return;
2290 }
2291
2292 /*
2293 * The host can send and interrupt when the busy state has
2294 * ended, allowing us to wait without wasting CPU cycles.
2295 * Unfortunately this is overloaded on the "data complete"
2296 * interrupt, so we need to take some care when handling
2297 * it.
2298 *
2299 * Note: The 1.0 specification is a bit ambiguous about this
2300 * feature so there might be some problems with older
2301 * controllers.
2302 */
2303 if (host->cmd->flags & MMC_RSP_BUSY) {
2304 if (host->cmd->data)
2305 DBG("Cannot wait for busy signal when also doing a data transfer");
2306 else if (!(host->quirks & SDHCI_QUIRK_NO_BUSY_IRQ)
2307 && !host->busy_handle) {
2308 /* Mark that command complete before busy is ended */
2309 host->busy_handle = 1;
2310 return;
2311 }
2312
2313 /* The controller does not support the end-of-busy IRQ,
2314 * fall through and take the SDHCI_INT_RESPONSE */
2315 } else if ((host->quirks2 & SDHCI_QUIRK2_STOP_WITH_TC) &&
2316 host->cmd->opcode == MMC_STOP_TRANSMISSION && !host->data) {
2317 *mask &= ~SDHCI_INT_DATA_END;
2318 }
2319
2320 if (intmask & SDHCI_INT_RESPONSE)
2321 sdhci_finish_command(host);
2322 }
2323
2324 #ifdef CONFIG_MMC_DEBUG
2325 static void sdhci_adma_show_error(struct sdhci_host *host)
2326 {
2327 const char *name = mmc_hostname(host->mmc);
2328 void *desc = host->adma_table;
2329
2330 sdhci_dumpregs(host);
2331
2332 while (true) {
2333 struct sdhci_adma2_64_desc *dma_desc = desc;
2334
2335 if (host->flags & SDHCI_USE_64_BIT_DMA)
2336 DBG("%s: %p: DMA 0x%08x%08x, LEN 0x%04x, Attr=0x%02x\n",
2337 name, desc, le32_to_cpu(dma_desc->addr_hi),
2338 le32_to_cpu(dma_desc->addr_lo),
2339 le16_to_cpu(dma_desc->len),
2340 le16_to_cpu(dma_desc->cmd));
2341 else
2342 DBG("%s: %p: DMA 0x%08x, LEN 0x%04x, Attr=0x%02x\n",
2343 name, desc, le32_to_cpu(dma_desc->addr_lo),
2344 le16_to_cpu(dma_desc->len),
2345 le16_to_cpu(dma_desc->cmd));
2346
2347 desc += host->desc_sz;
2348
2349 if (dma_desc->cmd & cpu_to_le16(ADMA2_END))
2350 break;
2351 }
2352 }
2353 #else
2354 static void sdhci_adma_show_error(struct sdhci_host *host) { }
2355 #endif
2356
2357 static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
2358 {
2359 u32 command;
2360 BUG_ON(intmask == 0);
2361
2362 /* CMD19 generates _only_ Buffer Read Ready interrupt */
2363 if (intmask & SDHCI_INT_DATA_AVAIL) {
2364 command = SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND));
2365 if (command == MMC_SEND_TUNING_BLOCK ||
2366 command == MMC_SEND_TUNING_BLOCK_HS200) {
2367 host->tuning_done = 1;
2368 wake_up(&host->buf_ready_int);
2369 return;
2370 }
2371 }
2372
2373 if (!host->data) {
2374 /*
2375 * The "data complete" interrupt is also used to
2376 * indicate that a busy state has ended. See comment
2377 * above in sdhci_cmd_irq().
2378 */
2379 if (host->cmd && (host->cmd->flags & MMC_RSP_BUSY)) {
2380 if (intmask & SDHCI_INT_DATA_TIMEOUT) {
2381 host->cmd->error = -ETIMEDOUT;
2382 tasklet_schedule(&host->finish_tasklet);
2383 return;
2384 }
2385 if (intmask & SDHCI_INT_DATA_END) {
2386 /*
2387 * Some cards handle busy-end interrupt
2388 * before the command completed, so make
2389 * sure we do things in the proper order.
2390 */
2391 if (host->busy_handle)
2392 sdhci_finish_command(host);
2393 else
2394 host->busy_handle = 1;
2395 return;
2396 }
2397 }
2398
2399 pr_err("%s: Got data interrupt 0x%08x even though no data operation was in progress.\n",
2400 mmc_hostname(host->mmc), (unsigned)intmask);
2401 sdhci_dumpregs(host);
2402
2403 return;
2404 }
2405
2406 if (intmask & SDHCI_INT_DATA_TIMEOUT)
2407 host->data->error = -ETIMEDOUT;
2408 else if (intmask & SDHCI_INT_DATA_END_BIT)
2409 host->data->error = -EILSEQ;
2410 else if ((intmask & SDHCI_INT_DATA_CRC) &&
2411 SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND))
2412 != MMC_BUS_TEST_R)
2413 host->data->error = -EILSEQ;
2414 else if (intmask & SDHCI_INT_ADMA_ERROR) {
2415 pr_err("%s: ADMA error\n", mmc_hostname(host->mmc));
2416 sdhci_adma_show_error(host);
2417 host->data->error = -EIO;
2418 if (host->ops->adma_workaround)
2419 host->ops->adma_workaround(host, intmask);
2420 }
2421
2422 if (host->data->error)
2423 sdhci_finish_data(host);
2424 else {
2425 if (intmask & (SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL))
2426 sdhci_transfer_pio(host);
2427
2428 /*
2429 * We currently don't do anything fancy with DMA
2430 * boundaries, but as we can't disable the feature
2431 * we need to at least restart the transfer.
2432 *
2433 * According to the spec sdhci_readl(host, SDHCI_DMA_ADDRESS)
2434 * should return a valid address to continue from, but as
2435 * some controllers are faulty, don't trust them.
2436 */
2437 if (intmask & SDHCI_INT_DMA_END) {
2438 u32 dmastart, dmanow;
2439 dmastart = sg_dma_address(host->data->sg);
2440 dmanow = dmastart + host->data->bytes_xfered;
2441 /*
2442 * Force update to the next DMA block boundary.
2443 */
2444 dmanow = (dmanow &
2445 ~(SDHCI_DEFAULT_BOUNDARY_SIZE - 1)) +
2446 SDHCI_DEFAULT_BOUNDARY_SIZE;
2447 host->data->bytes_xfered = dmanow - dmastart;
2448 DBG("%s: DMA base 0x%08x, transferred 0x%06x bytes,"
2449 " next 0x%08x\n",
2450 mmc_hostname(host->mmc), dmastart,
2451 host->data->bytes_xfered, dmanow);
2452 sdhci_writel(host, dmanow, SDHCI_DMA_ADDRESS);
2453 }
2454
2455 if (intmask & SDHCI_INT_DATA_END) {
2456 if (host->cmd) {
2457 /*
2458 * Data managed to finish before the
2459 * command completed. Make sure we do
2460 * things in the proper order.
2461 */
2462 host->data_early = 1;
2463 } else {
2464 sdhci_finish_data(host);
2465 }
2466 }
2467 }
2468 }
2469
2470 static irqreturn_t sdhci_irq(int irq, void *dev_id)
2471 {
2472 irqreturn_t result = IRQ_NONE;
2473 struct sdhci_host *host = dev_id;
2474 u32 intmask, mask, unexpected = 0;
2475 int max_loops = 16;
2476
2477 spin_lock(&host->lock);
2478
2479 if (host->runtime_suspended && !sdhci_sdio_irq_enabled(host)) {
2480 spin_unlock(&host->lock);
2481 return IRQ_NONE;
2482 }
2483
2484 intmask = sdhci_readl(host, SDHCI_INT_STATUS);
2485 if (!intmask || intmask == 0xffffffff) {
2486 result = IRQ_NONE;
2487 goto out;
2488 }
2489
2490 do {
2491 /* Clear selected interrupts. */
2492 mask = intmask & (SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK |
2493 SDHCI_INT_BUS_POWER);
2494 sdhci_writel(host, mask, SDHCI_INT_STATUS);
2495
2496 DBG("*** %s got interrupt: 0x%08x\n",
2497 mmc_hostname(host->mmc), intmask);
2498
2499 if (intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
2500 u32 present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
2501 SDHCI_CARD_PRESENT;
2502
2503 /*
2504 * There is a observation on i.mx esdhc. INSERT
2505 * bit will be immediately set again when it gets
2506 * cleared, if a card is inserted. We have to mask
2507 * the irq to prevent interrupt storm which will
2508 * freeze the system. And the REMOVE gets the
2509 * same situation.
2510 *
2511 * More testing are needed here to ensure it works
2512 * for other platforms though.
2513 */
2514 host->ier &= ~(SDHCI_INT_CARD_INSERT |
2515 SDHCI_INT_CARD_REMOVE);
2516 host->ier |= present ? SDHCI_INT_CARD_REMOVE :
2517 SDHCI_INT_CARD_INSERT;
2518 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
2519 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
2520
2521 sdhci_writel(host, intmask & (SDHCI_INT_CARD_INSERT |
2522 SDHCI_INT_CARD_REMOVE), SDHCI_INT_STATUS);
2523
2524 host->thread_isr |= intmask & (SDHCI_INT_CARD_INSERT |
2525 SDHCI_INT_CARD_REMOVE);
2526 result = IRQ_WAKE_THREAD;
2527 }
2528
2529 if (intmask & SDHCI_INT_CMD_MASK)
2530 sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK,
2531 &intmask);
2532
2533 if (intmask & SDHCI_INT_DATA_MASK)
2534 sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK);
2535
2536 if (intmask & SDHCI_INT_BUS_POWER)
2537 pr_err("%s: Card is consuming too much power!\n",
2538 mmc_hostname(host->mmc));
2539
2540 if (intmask & SDHCI_INT_CARD_INT) {
2541 sdhci_enable_sdio_irq_nolock(host, false);
2542 host->thread_isr |= SDHCI_INT_CARD_INT;
2543 result = IRQ_WAKE_THREAD;
2544 }
2545
2546 intmask &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE |
2547 SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK |
2548 SDHCI_INT_ERROR | SDHCI_INT_BUS_POWER |
2549 SDHCI_INT_CARD_INT);
2550
2551 if (intmask) {
2552 unexpected |= intmask;
2553 sdhci_writel(host, intmask, SDHCI_INT_STATUS);
2554 }
2555
2556 if (result == IRQ_NONE)
2557 result = IRQ_HANDLED;
2558
2559 intmask = sdhci_readl(host, SDHCI_INT_STATUS);
2560 } while (intmask && --max_loops);
2561 out:
2562 spin_unlock(&host->lock);
2563
2564 if (unexpected) {
2565 pr_err("%s: Unexpected interrupt 0x%08x.\n",
2566 mmc_hostname(host->mmc), unexpected);
2567 sdhci_dumpregs(host);
2568 }
2569
2570 return result;
2571 }
2572
2573 static irqreturn_t sdhci_thread_irq(int irq, void *dev_id)
2574 {
2575 struct sdhci_host *host = dev_id;
2576 unsigned long flags;
2577 u32 isr;
2578
2579 spin_lock_irqsave(&host->lock, flags);
2580 isr = host->thread_isr;
2581 host->thread_isr = 0;
2582 spin_unlock_irqrestore(&host->lock, flags);
2583
2584 if (isr & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
2585 sdhci_card_event(host->mmc);
2586 mmc_detect_change(host->mmc, msecs_to_jiffies(200));
2587 }
2588
2589 if (isr & SDHCI_INT_CARD_INT) {
2590 sdio_run_irqs(host->mmc);
2591
2592 spin_lock_irqsave(&host->lock, flags);
2593 if (host->flags & SDHCI_SDIO_IRQ_ENABLED)
2594 sdhci_enable_sdio_irq_nolock(host, true);
2595 spin_unlock_irqrestore(&host->lock, flags);
2596 }
2597
2598 return isr ? IRQ_HANDLED : IRQ_NONE;
2599 }
2600
2601 /*****************************************************************************\
2602 * *
2603 * Suspend/resume *
2604 * *
2605 \*****************************************************************************/
2606
2607 #ifdef CONFIG_PM
2608 void sdhci_enable_irq_wakeups(struct sdhci_host *host)
2609 {
2610 u8 val;
2611 u8 mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE
2612 | SDHCI_WAKE_ON_INT;
2613
2614 val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
2615 val |= mask ;
2616 /* Avoid fake wake up */
2617 if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
2618 val &= ~(SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE);
2619 sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
2620 }
2621 EXPORT_SYMBOL_GPL(sdhci_enable_irq_wakeups);
2622
2623 static void sdhci_disable_irq_wakeups(struct sdhci_host *host)
2624 {
2625 u8 val;
2626 u8 mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE
2627 | SDHCI_WAKE_ON_INT;
2628
2629 val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
2630 val &= ~mask;
2631 sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
2632 }
2633
2634 int sdhci_suspend_host(struct sdhci_host *host)
2635 {
2636 sdhci_disable_card_detection(host);
2637
2638 mmc_retune_timer_stop(host->mmc);
2639 mmc_retune_needed(host->mmc);
2640
2641 if (!device_may_wakeup(mmc_dev(host->mmc))) {
2642 host->ier = 0;
2643 sdhci_writel(host, 0, SDHCI_INT_ENABLE);
2644 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
2645 free_irq(host->irq, host);
2646 } else {
2647 sdhci_enable_irq_wakeups(host);
2648 enable_irq_wake(host->irq);
2649 }
2650 return 0;
2651 }
2652
2653 EXPORT_SYMBOL_GPL(sdhci_suspend_host);
2654
2655 int sdhci_resume_host(struct sdhci_host *host)
2656 {
2657 int ret = 0;
2658
2659 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
2660 if (host->ops->enable_dma)
2661 host->ops->enable_dma(host);
2662 }
2663
2664 if ((host->mmc->pm_flags & MMC_PM_KEEP_POWER) &&
2665 (host->quirks2 & SDHCI_QUIRK2_HOST_OFF_CARD_ON)) {
2666 /* Card keeps power but host controller does not */
2667 sdhci_init(host, 0);
2668 host->pwr = 0;
2669 host->clock = 0;
2670 sdhci_set_ios(host->mmc, &host->mmc->ios);
2671 } else {
2672 sdhci_init(host, (host->mmc->pm_flags & MMC_PM_KEEP_POWER));
2673 mmiowb();
2674 }
2675
2676 if (!device_may_wakeup(mmc_dev(host->mmc))) {
2677 ret = request_threaded_irq(host->irq, sdhci_irq,
2678 sdhci_thread_irq, IRQF_SHARED,
2679 mmc_hostname(host->mmc), host);
2680 if (ret)
2681 return ret;
2682 } else {
2683 sdhci_disable_irq_wakeups(host);
2684 disable_irq_wake(host->irq);
2685 }
2686
2687 sdhci_enable_card_detection(host);
2688
2689 return ret;
2690 }
2691
2692 EXPORT_SYMBOL_GPL(sdhci_resume_host);
2693
2694 int sdhci_runtime_suspend_host(struct sdhci_host *host)
2695 {
2696 unsigned long flags;
2697
2698 mmc_retune_timer_stop(host->mmc);
2699 mmc_retune_needed(host->mmc);
2700
2701 spin_lock_irqsave(&host->lock, flags);
2702 host->ier &= SDHCI_INT_CARD_INT;
2703 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
2704 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
2705 spin_unlock_irqrestore(&host->lock, flags);
2706
2707 synchronize_hardirq(host->irq);
2708
2709 spin_lock_irqsave(&host->lock, flags);
2710 host->runtime_suspended = true;
2711 spin_unlock_irqrestore(&host->lock, flags);
2712
2713 return 0;
2714 }
2715 EXPORT_SYMBOL_GPL(sdhci_runtime_suspend_host);
2716
2717 int sdhci_runtime_resume_host(struct sdhci_host *host)
2718 {
2719 unsigned long flags;
2720 int host_flags = host->flags;
2721
2722 if (host_flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
2723 if (host->ops->enable_dma)
2724 host->ops->enable_dma(host);
2725 }
2726
2727 sdhci_init(host, 0);
2728
2729 /* Force clock and power re-program */
2730 host->pwr = 0;
2731 host->clock = 0;
2732 sdhci_start_signal_voltage_switch(host->mmc, &host->mmc->ios);
2733 sdhci_set_ios(host->mmc, &host->mmc->ios);
2734
2735 if ((host_flags & SDHCI_PV_ENABLED) &&
2736 !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN)) {
2737 spin_lock_irqsave(&host->lock, flags);
2738 sdhci_enable_preset_value(host, true);
2739 spin_unlock_irqrestore(&host->lock, flags);
2740 }
2741
2742 spin_lock_irqsave(&host->lock, flags);
2743
2744 host->runtime_suspended = false;
2745
2746 /* Enable SDIO IRQ */
2747 if (host->flags & SDHCI_SDIO_IRQ_ENABLED)
2748 sdhci_enable_sdio_irq_nolock(host, true);
2749
2750 /* Enable Card Detection */
2751 sdhci_enable_card_detection(host);
2752
2753 spin_unlock_irqrestore(&host->lock, flags);
2754
2755 return 0;
2756 }
2757 EXPORT_SYMBOL_GPL(sdhci_runtime_resume_host);
2758
2759 #endif /* CONFIG_PM */
2760
2761 /*****************************************************************************\
2762 * *
2763 * Device allocation/registration *
2764 * *
2765 \*****************************************************************************/
2766
2767 struct sdhci_host *sdhci_alloc_host(struct device *dev,
2768 size_t priv_size)
2769 {
2770 struct mmc_host *mmc;
2771 struct sdhci_host *host;
2772
2773 WARN_ON(dev == NULL);
2774
2775 mmc = mmc_alloc_host(sizeof(struct sdhci_host) + priv_size, dev);
2776 if (!mmc)
2777 return ERR_PTR(-ENOMEM);
2778
2779 host = mmc_priv(mmc);
2780 host->mmc = mmc;
2781 host->mmc_host_ops = sdhci_ops;
2782 mmc->ops = &host->mmc_host_ops;
2783
2784 return host;
2785 }
2786
2787 EXPORT_SYMBOL_GPL(sdhci_alloc_host);
2788
2789 static int sdhci_set_dma_mask(struct sdhci_host *host)
2790 {
2791 struct mmc_host *mmc = host->mmc;
2792 struct device *dev = mmc_dev(mmc);
2793 int ret = -EINVAL;
2794
2795 if (host->quirks2 & SDHCI_QUIRK2_BROKEN_64_BIT_DMA)
2796 host->flags &= ~SDHCI_USE_64_BIT_DMA;
2797
2798 /* Try 64-bit mask if hardware is capable of it */
2799 if (host->flags & SDHCI_USE_64_BIT_DMA) {
2800 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
2801 if (ret) {
2802 pr_warn("%s: Failed to set 64-bit DMA mask.\n",
2803 mmc_hostname(mmc));
2804 host->flags &= ~SDHCI_USE_64_BIT_DMA;
2805 }
2806 }
2807
2808 /* 32-bit mask as default & fallback */
2809 if (ret) {
2810 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
2811 if (ret)
2812 pr_warn("%s: Failed to set 32-bit DMA mask.\n",
2813 mmc_hostname(mmc));
2814 }
2815
2816 return ret;
2817 }
2818
2819 int sdhci_add_host(struct sdhci_host *host)
2820 {
2821 struct mmc_host *mmc;
2822 u32 caps[2] = {0, 0};
2823 u32 max_current_caps;
2824 unsigned int ocr_avail;
2825 unsigned int override_timeout_clk;
2826 u32 max_clk;
2827 int ret;
2828
2829 WARN_ON(host == NULL);
2830 if (host == NULL)
2831 return -EINVAL;
2832
2833 mmc = host->mmc;
2834
2835 if (debug_quirks)
2836 host->quirks = debug_quirks;
2837 if (debug_quirks2)
2838 host->quirks2 = debug_quirks2;
2839
2840 override_timeout_clk = host->timeout_clk;
2841
2842 sdhci_do_reset(host, SDHCI_RESET_ALL);
2843
2844 host->version = sdhci_readw(host, SDHCI_HOST_VERSION);
2845 host->version = (host->version & SDHCI_SPEC_VER_MASK)
2846 >> SDHCI_SPEC_VER_SHIFT;
2847 if (host->version > SDHCI_SPEC_300) {
2848 pr_err("%s: Unknown controller version (%d). You may experience problems.\n",
2849 mmc_hostname(mmc), host->version);
2850 }
2851
2852 caps[0] = (host->quirks & SDHCI_QUIRK_MISSING_CAPS) ? host->caps :
2853 sdhci_readl(host, SDHCI_CAPABILITIES);
2854
2855 if (host->version >= SDHCI_SPEC_300)
2856 caps[1] = (host->quirks & SDHCI_QUIRK_MISSING_CAPS) ?
2857 host->caps1 :
2858 sdhci_readl(host, SDHCI_CAPABILITIES_1);
2859
2860 if (host->quirks & SDHCI_QUIRK_FORCE_DMA)
2861 host->flags |= SDHCI_USE_SDMA;
2862 else if (!(caps[0] & SDHCI_CAN_DO_SDMA))
2863 DBG("Controller doesn't have SDMA capability\n");
2864 else
2865 host->flags |= SDHCI_USE_SDMA;
2866
2867 if ((host->quirks & SDHCI_QUIRK_BROKEN_DMA) &&
2868 (host->flags & SDHCI_USE_SDMA)) {
2869 DBG("Disabling DMA as it is marked broken\n");
2870 host->flags &= ~SDHCI_USE_SDMA;
2871 }
2872
2873 if ((host->version >= SDHCI_SPEC_200) &&
2874 (caps[0] & SDHCI_CAN_DO_ADMA2))
2875 host->flags |= SDHCI_USE_ADMA;
2876
2877 if ((host->quirks & SDHCI_QUIRK_BROKEN_ADMA) &&
2878 (host->flags & SDHCI_USE_ADMA)) {
2879 DBG("Disabling ADMA as it is marked broken\n");
2880 host->flags &= ~SDHCI_USE_ADMA;
2881 }
2882
2883 /*
2884 * It is assumed that a 64-bit capable device has set a 64-bit DMA mask
2885 * and *must* do 64-bit DMA. A driver has the opportunity to change
2886 * that during the first call to ->enable_dma(). Similarly
2887 * SDHCI_QUIRK2_BROKEN_64_BIT_DMA must be left to the drivers to
2888 * implement.
2889 */
2890 if (caps[0] & SDHCI_CAN_64BIT)
2891 host->flags |= SDHCI_USE_64_BIT_DMA;
2892
2893 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
2894 ret = sdhci_set_dma_mask(host);
2895
2896 if (!ret && host->ops->enable_dma)
2897 ret = host->ops->enable_dma(host);
2898
2899 if (ret) {
2900 pr_warn("%s: No suitable DMA available - falling back to PIO\n",
2901 mmc_hostname(mmc));
2902 host->flags &= ~(SDHCI_USE_SDMA | SDHCI_USE_ADMA);
2903
2904 ret = 0;
2905 }
2906 }
2907
2908 /* SDMA does not support 64-bit DMA */
2909 if (host->flags & SDHCI_USE_64_BIT_DMA)
2910 host->flags &= ~SDHCI_USE_SDMA;
2911
2912 if (host->flags & SDHCI_USE_ADMA) {
2913 dma_addr_t dma;
2914 void *buf;
2915
2916 /*
2917 * The DMA descriptor table size is calculated as the maximum
2918 * number of segments times 2, to allow for an alignment
2919 * descriptor for each segment, plus 1 for a nop end descriptor,
2920 * all multipled by the descriptor size.
2921 */
2922 if (host->flags & SDHCI_USE_64_BIT_DMA) {
2923 host->adma_table_sz = (SDHCI_MAX_SEGS * 2 + 1) *
2924 SDHCI_ADMA2_64_DESC_SZ;
2925 host->desc_sz = SDHCI_ADMA2_64_DESC_SZ;
2926 } else {
2927 host->adma_table_sz = (SDHCI_MAX_SEGS * 2 + 1) *
2928 SDHCI_ADMA2_32_DESC_SZ;
2929 host->desc_sz = SDHCI_ADMA2_32_DESC_SZ;
2930 }
2931
2932 host->align_buffer_sz = SDHCI_MAX_SEGS * SDHCI_ADMA2_ALIGN;
2933 buf = dma_alloc_coherent(mmc_dev(mmc), host->align_buffer_sz +
2934 host->adma_table_sz, &dma, GFP_KERNEL);
2935 if (!buf) {
2936 pr_warn("%s: Unable to allocate ADMA buffers - falling back to standard DMA\n",
2937 mmc_hostname(mmc));
2938 host->flags &= ~SDHCI_USE_ADMA;
2939 } else if ((dma + host->align_buffer_sz) &
2940 (SDHCI_ADMA2_DESC_ALIGN - 1)) {
2941 pr_warn("%s: unable to allocate aligned ADMA descriptor\n",
2942 mmc_hostname(mmc));
2943 host->flags &= ~SDHCI_USE_ADMA;
2944 dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz +
2945 host->adma_table_sz, buf, dma);
2946 } else {
2947 host->align_buffer = buf;
2948 host->align_addr = dma;
2949
2950 host->adma_table = buf + host->align_buffer_sz;
2951 host->adma_addr = dma + host->align_buffer_sz;
2952 }
2953 }
2954
2955 /*
2956 * If we use DMA, then it's up to the caller to set the DMA
2957 * mask, but PIO does not need the hw shim so we set a new
2958 * mask here in that case.
2959 */
2960 if (!(host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA))) {
2961 host->dma_mask = DMA_BIT_MASK(64);
2962 mmc_dev(mmc)->dma_mask = &host->dma_mask;
2963 }
2964
2965 if (host->version >= SDHCI_SPEC_300)
2966 host->max_clk = (caps[0] & SDHCI_CLOCK_V3_BASE_MASK)
2967 >> SDHCI_CLOCK_BASE_SHIFT;
2968 else
2969 host->max_clk = (caps[0] & SDHCI_CLOCK_BASE_MASK)
2970 >> SDHCI_CLOCK_BASE_SHIFT;
2971
2972 host->max_clk *= 1000000;
2973 if (host->max_clk == 0 || host->quirks &
2974 SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN) {
2975 if (!host->ops->get_max_clock) {
2976 pr_err("%s: Hardware doesn't specify base clock frequency.\n",
2977 mmc_hostname(mmc));
2978 ret = -ENODEV;
2979 goto undma;
2980 }
2981 host->max_clk = host->ops->get_max_clock(host);
2982 }
2983
2984 /*
2985 * In case of Host Controller v3.00, find out whether clock
2986 * multiplier is supported.
2987 */
2988 host->clk_mul = (caps[1] & SDHCI_CLOCK_MUL_MASK) >>
2989 SDHCI_CLOCK_MUL_SHIFT;
2990
2991 /*
2992 * In case the value in Clock Multiplier is 0, then programmable
2993 * clock mode is not supported, otherwise the actual clock
2994 * multiplier is one more than the value of Clock Multiplier
2995 * in the Capabilities Register.
2996 */
2997 if (host->clk_mul)
2998 host->clk_mul += 1;
2999
3000 /*
3001 * Set host parameters.
3002 */
3003 max_clk = host->max_clk;
3004
3005 if (host->ops->get_min_clock)
3006 mmc->f_min = host->ops->get_min_clock(host);
3007 else if (host->version >= SDHCI_SPEC_300) {
3008 if (host->clk_mul) {
3009 mmc->f_min = (host->max_clk * host->clk_mul) / 1024;
3010 max_clk = host->max_clk * host->clk_mul;
3011 } else
3012 mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_300;
3013 } else
3014 mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_200;
3015
3016 if (!mmc->f_max || mmc->f_max > max_clk)
3017 mmc->f_max = max_clk;
3018
3019 if (!(host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK)) {
3020 host->timeout_clk = (caps[0] & SDHCI_TIMEOUT_CLK_MASK) >>
3021 SDHCI_TIMEOUT_CLK_SHIFT;
3022 if (host->timeout_clk == 0) {
3023 if (host->ops->get_timeout_clock) {
3024 host->timeout_clk =
3025 host->ops->get_timeout_clock(host);
3026 } else {
3027 pr_err("%s: Hardware doesn't specify timeout clock frequency.\n",
3028 mmc_hostname(mmc));
3029 ret = -ENODEV;
3030 goto undma;
3031 }
3032 }
3033
3034 if (caps[0] & SDHCI_TIMEOUT_CLK_UNIT)
3035 host->timeout_clk *= 1000;
3036
3037 if (override_timeout_clk)
3038 host->timeout_clk = override_timeout_clk;
3039
3040 mmc->max_busy_timeout = host->ops->get_max_timeout_count ?
3041 host->ops->get_max_timeout_count(host) : 1 << 27;
3042 mmc->max_busy_timeout /= host->timeout_clk;
3043 }
3044
3045 mmc->caps |= MMC_CAP_SDIO_IRQ | MMC_CAP_ERASE | MMC_CAP_CMD23;
3046 mmc->caps2 |= MMC_CAP2_SDIO_IRQ_NOTHREAD;
3047
3048 if (host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12)
3049 host->flags |= SDHCI_AUTO_CMD12;
3050
3051 /* Auto-CMD23 stuff only works in ADMA or PIO. */
3052 if ((host->version >= SDHCI_SPEC_300) &&
3053 ((host->flags & SDHCI_USE_ADMA) ||
3054 !(host->flags & SDHCI_USE_SDMA)) &&
3055 !(host->quirks2 & SDHCI_QUIRK2_ACMD23_BROKEN)) {
3056 host->flags |= SDHCI_AUTO_CMD23;
3057 DBG("%s: Auto-CMD23 available\n", mmc_hostname(mmc));
3058 } else {
3059 DBG("%s: Auto-CMD23 unavailable\n", mmc_hostname(mmc));
3060 }
3061
3062 /*
3063 * A controller may support 8-bit width, but the board itself
3064 * might not have the pins brought out. Boards that support
3065 * 8-bit width must set "mmc->caps |= MMC_CAP_8_BIT_DATA;" in
3066 * their platform code before calling sdhci_add_host(), and we
3067 * won't assume 8-bit width for hosts without that CAP.
3068 */
3069 if (!(host->quirks & SDHCI_QUIRK_FORCE_1_BIT_DATA))
3070 mmc->caps |= MMC_CAP_4_BIT_DATA;
3071
3072 if (host->quirks2 & SDHCI_QUIRK2_HOST_NO_CMD23)
3073 mmc->caps &= ~MMC_CAP_CMD23;
3074
3075 if (caps[0] & SDHCI_CAN_DO_HISPD)
3076 mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
3077
3078 if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) &&
3079 !(mmc->caps & MMC_CAP_NONREMOVABLE) &&
3080 mmc_gpio_get_cd(host->mmc) < 0)
3081 mmc->caps |= MMC_CAP_NEEDS_POLL;
3082
3083 /* If there are external regulators, get them */
3084 ret = mmc_regulator_get_supply(mmc);
3085 if (ret == -EPROBE_DEFER)
3086 goto undma;
3087
3088 /* If vqmmc regulator and no 1.8V signalling, then there's no UHS */
3089 if (!IS_ERR(mmc->supply.vqmmc)) {
3090 ret = regulator_enable(mmc->supply.vqmmc);
3091 if (!regulator_is_supported_voltage(mmc->supply.vqmmc, 1700000,
3092 1950000))
3093 caps[1] &= ~(SDHCI_SUPPORT_SDR104 |
3094 SDHCI_SUPPORT_SDR50 |
3095 SDHCI_SUPPORT_DDR50);
3096 if (ret) {
3097 pr_warn("%s: Failed to enable vqmmc regulator: %d\n",
3098 mmc_hostname(mmc), ret);
3099 mmc->supply.vqmmc = ERR_PTR(-EINVAL);
3100 }
3101 }
3102
3103 if (host->quirks2 & SDHCI_QUIRK2_NO_1_8_V)
3104 caps[1] &= ~(SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 |
3105 SDHCI_SUPPORT_DDR50);
3106
3107 /* Any UHS-I mode in caps implies SDR12 and SDR25 support. */
3108 if (caps[1] & (SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 |
3109 SDHCI_SUPPORT_DDR50))
3110 mmc->caps |= MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25;
3111
3112 /* SDR104 supports also implies SDR50 support */
3113 if (caps[1] & SDHCI_SUPPORT_SDR104) {
3114 mmc->caps |= MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_SDR50;
3115 /* SD3.0: SDR104 is supported so (for eMMC) the caps2
3116 * field can be promoted to support HS200.
3117 */
3118 if (!(host->quirks2 & SDHCI_QUIRK2_BROKEN_HS200))
3119 mmc->caps2 |= MMC_CAP2_HS200;
3120 } else if (caps[1] & SDHCI_SUPPORT_SDR50)
3121 mmc->caps |= MMC_CAP_UHS_SDR50;
3122
3123 if (host->quirks2 & SDHCI_QUIRK2_CAPS_BIT63_FOR_HS400 &&
3124 (caps[1] & SDHCI_SUPPORT_HS400))
3125 mmc->caps2 |= MMC_CAP2_HS400;
3126
3127 if ((mmc->caps2 & MMC_CAP2_HSX00_1_2V) &&
3128 (IS_ERR(mmc->supply.vqmmc) ||
3129 !regulator_is_supported_voltage(mmc->supply.vqmmc, 1100000,
3130 1300000)))
3131 mmc->caps2 &= ~MMC_CAP2_HSX00_1_2V;
3132
3133 if ((caps[1] & SDHCI_SUPPORT_DDR50) &&
3134 !(host->quirks2 & SDHCI_QUIRK2_BROKEN_DDR50))
3135 mmc->caps |= MMC_CAP_UHS_DDR50;
3136
3137 /* Does the host need tuning for SDR50? */
3138 if (caps[1] & SDHCI_USE_SDR50_TUNING)
3139 host->flags |= SDHCI_SDR50_NEEDS_TUNING;
3140
3141 /* Driver Type(s) (A, C, D) supported by the host */
3142 if (caps[1] & SDHCI_DRIVER_TYPE_A)
3143 mmc->caps |= MMC_CAP_DRIVER_TYPE_A;
3144 if (caps[1] & SDHCI_DRIVER_TYPE_C)
3145 mmc->caps |= MMC_CAP_DRIVER_TYPE_C;
3146 if (caps[1] & SDHCI_DRIVER_TYPE_D)
3147 mmc->caps |= MMC_CAP_DRIVER_TYPE_D;
3148
3149 /* Initial value for re-tuning timer count */
3150 host->tuning_count = (caps[1] & SDHCI_RETUNING_TIMER_COUNT_MASK) >>
3151 SDHCI_RETUNING_TIMER_COUNT_SHIFT;
3152
3153 /*
3154 * In case Re-tuning Timer is not disabled, the actual value of
3155 * re-tuning timer will be 2 ^ (n - 1).
3156 */
3157 if (host->tuning_count)
3158 host->tuning_count = 1 << (host->tuning_count - 1);
3159
3160 /* Re-tuning mode supported by the Host Controller */
3161 host->tuning_mode = (caps[1] & SDHCI_RETUNING_MODE_MASK) >>
3162 SDHCI_RETUNING_MODE_SHIFT;
3163
3164 ocr_avail = 0;
3165
3166 /*
3167 * According to SD Host Controller spec v3.00, if the Host System
3168 * can afford more than 150mA, Host Driver should set XPC to 1. Also
3169 * the value is meaningful only if Voltage Support in the Capabilities
3170 * register is set. The actual current value is 4 times the register
3171 * value.
3172 */
3173 max_current_caps = sdhci_readl(host, SDHCI_MAX_CURRENT);
3174 if (!max_current_caps && !IS_ERR(mmc->supply.vmmc)) {
3175 int curr = regulator_get_current_limit(mmc->supply.vmmc);
3176 if (curr > 0) {
3177
3178 /* convert to SDHCI_MAX_CURRENT format */
3179 curr = curr/1000; /* convert to mA */
3180 curr = curr/SDHCI_MAX_CURRENT_MULTIPLIER;
3181
3182 curr = min_t(u32, curr, SDHCI_MAX_CURRENT_LIMIT);
3183 max_current_caps =
3184 (curr << SDHCI_MAX_CURRENT_330_SHIFT) |
3185 (curr << SDHCI_MAX_CURRENT_300_SHIFT) |
3186 (curr << SDHCI_MAX_CURRENT_180_SHIFT);
3187 }
3188 }
3189
3190 if (caps[0] & SDHCI_CAN_VDD_330) {
3191 ocr_avail |= MMC_VDD_32_33 | MMC_VDD_33_34;
3192
3193 mmc->max_current_330 = ((max_current_caps &
3194 SDHCI_MAX_CURRENT_330_MASK) >>
3195 SDHCI_MAX_CURRENT_330_SHIFT) *
3196 SDHCI_MAX_CURRENT_MULTIPLIER;
3197 }
3198 if (caps[0] & SDHCI_CAN_VDD_300) {
3199 ocr_avail |= MMC_VDD_29_30 | MMC_VDD_30_31;
3200
3201 mmc->max_current_300 = ((max_current_caps &
3202 SDHCI_MAX_CURRENT_300_MASK) >>
3203 SDHCI_MAX_CURRENT_300_SHIFT) *
3204 SDHCI_MAX_CURRENT_MULTIPLIER;
3205 }
3206 if (caps[0] & SDHCI_CAN_VDD_180) {
3207 ocr_avail |= MMC_VDD_165_195;
3208
3209 mmc->max_current_180 = ((max_current_caps &
3210 SDHCI_MAX_CURRENT_180_MASK) >>
3211 SDHCI_MAX_CURRENT_180_SHIFT) *
3212 SDHCI_MAX_CURRENT_MULTIPLIER;
3213 }
3214
3215 /* If OCR set by host, use it instead. */
3216 if (host->ocr_mask)
3217 ocr_avail = host->ocr_mask;
3218
3219 /* If OCR set by external regulators, give it highest prio. */
3220 if (mmc->ocr_avail)
3221 ocr_avail = mmc->ocr_avail;
3222
3223 mmc->ocr_avail = ocr_avail;
3224 mmc->ocr_avail_sdio = ocr_avail;
3225 if (host->ocr_avail_sdio)
3226 mmc->ocr_avail_sdio &= host->ocr_avail_sdio;
3227 mmc->ocr_avail_sd = ocr_avail;
3228 if (host->ocr_avail_sd)
3229 mmc->ocr_avail_sd &= host->ocr_avail_sd;
3230 else /* normal SD controllers don't support 1.8V */
3231 mmc->ocr_avail_sd &= ~MMC_VDD_165_195;
3232 mmc->ocr_avail_mmc = ocr_avail;
3233 if (host->ocr_avail_mmc)
3234 mmc->ocr_avail_mmc &= host->ocr_avail_mmc;
3235
3236 if (mmc->ocr_avail == 0) {
3237 pr_err("%s: Hardware doesn't report any support voltages.\n",
3238 mmc_hostname(mmc));
3239 ret = -ENODEV;
3240 goto unreg;
3241 }
3242
3243 spin_lock_init(&host->lock);
3244
3245 /*
3246 * Maximum number of segments. Depends on if the hardware
3247 * can do scatter/gather or not.
3248 */
3249 if (host->flags & SDHCI_USE_ADMA)
3250 mmc->max_segs = SDHCI_MAX_SEGS;
3251 else if (host->flags & SDHCI_USE_SDMA)
3252 mmc->max_segs = 1;
3253 else /* PIO */
3254 mmc->max_segs = SDHCI_MAX_SEGS;
3255
3256 /*
3257 * Maximum number of sectors in one transfer. Limited by SDMA boundary
3258 * size (512KiB). Note some tuning modes impose a 4MiB limit, but this
3259 * is less anyway.
3260 */
3261 mmc->max_req_size = 524288;
3262
3263 /*
3264 * Maximum segment size. Could be one segment with the maximum number
3265 * of bytes. When doing hardware scatter/gather, each entry cannot
3266 * be larger than 64 KiB though.
3267 */
3268 if (host->flags & SDHCI_USE_ADMA) {
3269 if (host->quirks & SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC)
3270 mmc->max_seg_size = 65535;
3271 else
3272 mmc->max_seg_size = 65536;
3273 } else {
3274 mmc->max_seg_size = mmc->max_req_size;
3275 }
3276
3277 /*
3278 * Maximum block size. This varies from controller to controller and
3279 * is specified in the capabilities register.
3280 */
3281 if (host->quirks & SDHCI_QUIRK_FORCE_BLK_SZ_2048) {
3282 mmc->max_blk_size = 2;
3283 } else {
3284 mmc->max_blk_size = (caps[0] & SDHCI_MAX_BLOCK_MASK) >>
3285 SDHCI_MAX_BLOCK_SHIFT;
3286 if (mmc->max_blk_size >= 3) {
3287 pr_warn("%s: Invalid maximum block size, assuming 512 bytes\n",
3288 mmc_hostname(mmc));
3289 mmc->max_blk_size = 0;
3290 }
3291 }
3292
3293 mmc->max_blk_size = 512 << mmc->max_blk_size;
3294
3295 /*
3296 * Maximum block count.
3297 */
3298 mmc->max_blk_count = (host->quirks & SDHCI_QUIRK_NO_MULTIBLOCK) ? 1 : 65535;
3299
3300 /*
3301 * Init tasklets.
3302 */
3303 tasklet_init(&host->finish_tasklet,
3304 sdhci_tasklet_finish, (unsigned long)host);
3305
3306 setup_timer(&host->timer, sdhci_timeout_timer, (unsigned long)host);
3307
3308 init_waitqueue_head(&host->buf_ready_int);
3309
3310 sdhci_init(host, 0);
3311
3312 ret = request_threaded_irq(host->irq, sdhci_irq, sdhci_thread_irq,
3313 IRQF_SHARED, mmc_hostname(mmc), host);
3314 if (ret) {
3315 pr_err("%s: Failed to request IRQ %d: %d\n",
3316 mmc_hostname(mmc), host->irq, ret);
3317 goto untasklet;
3318 }
3319
3320 #ifdef CONFIG_MMC_DEBUG
3321 sdhci_dumpregs(host);
3322 #endif
3323
3324 ret = sdhci_led_register(host);
3325 if (ret) {
3326 pr_err("%s: Failed to register LED device: %d\n",
3327 mmc_hostname(mmc), ret);
3328 goto unirq;
3329 }
3330
3331 mmiowb();
3332
3333 ret = mmc_add_host(mmc);
3334 if (ret)
3335 goto unled;
3336
3337 pr_info("%s: SDHCI controller on %s [%s] using %s\n",
3338 mmc_hostname(mmc), host->hw_name, dev_name(mmc_dev(mmc)),
3339 (host->flags & SDHCI_USE_ADMA) ?
3340 (host->flags & SDHCI_USE_64_BIT_DMA) ? "ADMA 64-bit" : "ADMA" :
3341 (host->flags & SDHCI_USE_SDMA) ? "DMA" : "PIO");
3342
3343 sdhci_enable_card_detection(host);
3344
3345 return 0;
3346
3347 unled:
3348 sdhci_led_unregister(host);
3349 unirq:
3350 sdhci_do_reset(host, SDHCI_RESET_ALL);
3351 sdhci_writel(host, 0, SDHCI_INT_ENABLE);
3352 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
3353 free_irq(host->irq, host);
3354 untasklet:
3355 tasklet_kill(&host->finish_tasklet);
3356 unreg:
3357 if (!IS_ERR(mmc->supply.vqmmc))
3358 regulator_disable(mmc->supply.vqmmc);
3359 undma:
3360 if (host->align_buffer)
3361 dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz +
3362 host->adma_table_sz, host->align_buffer,
3363 host->align_addr);
3364 host->adma_table = NULL;
3365 host->align_buffer = NULL;
3366
3367 return ret;
3368 }
3369
3370 EXPORT_SYMBOL_GPL(sdhci_add_host);
3371
3372 void sdhci_remove_host(struct sdhci_host *host, int dead)
3373 {
3374 struct mmc_host *mmc = host->mmc;
3375 unsigned long flags;
3376
3377 if (dead) {
3378 spin_lock_irqsave(&host->lock, flags);
3379
3380 host->flags |= SDHCI_DEVICE_DEAD;
3381
3382 if (host->mrq) {
3383 pr_err("%s: Controller removed during "
3384 " transfer!\n", mmc_hostname(mmc));
3385
3386 host->mrq->cmd->error = -ENOMEDIUM;
3387 tasklet_schedule(&host->finish_tasklet);
3388 }
3389
3390 spin_unlock_irqrestore(&host->lock, flags);
3391 }
3392
3393 sdhci_disable_card_detection(host);
3394
3395 mmc_remove_host(mmc);
3396
3397 sdhci_led_unregister(host);
3398
3399 if (!dead)
3400 sdhci_do_reset(host, SDHCI_RESET_ALL);
3401
3402 sdhci_writel(host, 0, SDHCI_INT_ENABLE);
3403 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
3404 free_irq(host->irq, host);
3405
3406 del_timer_sync(&host->timer);
3407
3408 tasklet_kill(&host->finish_tasklet);
3409
3410 if (!IS_ERR(mmc->supply.vqmmc))
3411 regulator_disable(mmc->supply.vqmmc);
3412
3413 if (host->align_buffer)
3414 dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz +
3415 host->adma_table_sz, host->align_buffer,
3416 host->align_addr);
3417
3418 host->adma_table = NULL;
3419 host->align_buffer = NULL;
3420 }
3421
3422 EXPORT_SYMBOL_GPL(sdhci_remove_host);
3423
3424 void sdhci_free_host(struct sdhci_host *host)
3425 {
3426 mmc_free_host(host->mmc);
3427 }
3428
3429 EXPORT_SYMBOL_GPL(sdhci_free_host);
3430
3431 /*****************************************************************************\
3432 * *
3433 * Driver init/exit *
3434 * *
3435 \*****************************************************************************/
3436
3437 static int __init sdhci_drv_init(void)
3438 {
3439 pr_info(DRIVER_NAME
3440 ": Secure Digital Host Controller Interface driver\n");
3441 pr_info(DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
3442
3443 return 0;
3444 }
3445
3446 static void __exit sdhci_drv_exit(void)
3447 {
3448 }
3449
3450 module_init(sdhci_drv_init);
3451 module_exit(sdhci_drv_exit);
3452
3453 module_param(debug_quirks, uint, 0444);
3454 module_param(debug_quirks2, uint, 0444);
3455
3456 MODULE_AUTHOR("Pierre Ossman <pierre@ossman.eu>");
3457 MODULE_DESCRIPTION("Secure Digital Host Controller Interface core driver");
3458 MODULE_LICENSE("GPL");
3459
3460 MODULE_PARM_DESC(debug_quirks, "Force certain quirks.");
3461 MODULE_PARM_DESC(debug_quirks2, "Force certain other quirks.");
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