Version:  2.0.40 2.2.26 2.4.37 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19

Linux/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/slot-gpio.h>
 32 
 33 #include "sdhci.h"
 34 
 35 #define DRIVER_NAME "sdhci"
 36 
 37 #define DBG(f, x...) \
 38         pr_debug(DRIVER_NAME " [%s()]: " f, __func__,## x)
 39 
 40 #if defined(CONFIG_LEDS_CLASS) || (defined(CONFIG_LEDS_CLASS_MODULE) && \
 41         defined(CONFIG_MMC_SDHCI_MODULE))
 42 #define SDHCI_USE_LEDS_CLASS
 43 #endif
 44 
 45 #define MAX_TUNING_LOOP 40
 46 
 47 static unsigned int debug_quirks = 0;
 48 static unsigned int debug_quirks2;
 49 
 50 static void sdhci_finish_data(struct sdhci_host *);
 51 
 52 static void sdhci_finish_command(struct sdhci_host *);
 53 static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode);
 54 static void sdhci_tuning_timer(unsigned long data);
 55 static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable);
 56 
 57 #ifdef CONFIG_PM
 58 static int sdhci_runtime_pm_get(struct sdhci_host *host);
 59 static int sdhci_runtime_pm_put(struct sdhci_host *host);
 60 static void sdhci_runtime_pm_bus_on(struct sdhci_host *host);
 61 static void sdhci_runtime_pm_bus_off(struct sdhci_host *host);
 62 #else
 63 static inline int sdhci_runtime_pm_get(struct sdhci_host *host)
 64 {
 65         return 0;
 66 }
 67 static inline int sdhci_runtime_pm_put(struct sdhci_host *host)
 68 {
 69         return 0;
 70 }
 71 static void sdhci_runtime_pm_bus_on(struct sdhci_host *host)
 72 {
 73 }
 74 static void sdhci_runtime_pm_bus_off(struct sdhci_host *host)
 75 {
 76 }
 77 #endif
 78 
 79 static void sdhci_dumpregs(struct sdhci_host *host)
 80 {
 81         pr_debug(DRIVER_NAME ": =========== REGISTER DUMP (%s)===========\n",
 82                 mmc_hostname(host->mmc));
 83 
 84         pr_debug(DRIVER_NAME ": Sys addr: 0x%08x | Version:  0x%08x\n",
 85                 sdhci_readl(host, SDHCI_DMA_ADDRESS),
 86                 sdhci_readw(host, SDHCI_HOST_VERSION));
 87         pr_debug(DRIVER_NAME ": Blk size: 0x%08x | Blk cnt:  0x%08x\n",
 88                 sdhci_readw(host, SDHCI_BLOCK_SIZE),
 89                 sdhci_readw(host, SDHCI_BLOCK_COUNT));
 90         pr_debug(DRIVER_NAME ": Argument: 0x%08x | Trn mode: 0x%08x\n",
 91                 sdhci_readl(host, SDHCI_ARGUMENT),
 92                 sdhci_readw(host, SDHCI_TRANSFER_MODE));
 93         pr_debug(DRIVER_NAME ": Present:  0x%08x | Host ctl: 0x%08x\n",
 94                 sdhci_readl(host, SDHCI_PRESENT_STATE),
 95                 sdhci_readb(host, SDHCI_HOST_CONTROL));
 96         pr_debug(DRIVER_NAME ": Power:    0x%08x | Blk gap:  0x%08x\n",
 97                 sdhci_readb(host, SDHCI_POWER_CONTROL),
 98                 sdhci_readb(host, SDHCI_BLOCK_GAP_CONTROL));
 99         pr_debug(DRIVER_NAME ": Wake-up:  0x%08x | Clock:    0x%08x\n",
100                 sdhci_readb(host, SDHCI_WAKE_UP_CONTROL),
101                 sdhci_readw(host, SDHCI_CLOCK_CONTROL));
102         pr_debug(DRIVER_NAME ": Timeout:  0x%08x | Int stat: 0x%08x\n",
103                 sdhci_readb(host, SDHCI_TIMEOUT_CONTROL),
104                 sdhci_readl(host, SDHCI_INT_STATUS));
105         pr_debug(DRIVER_NAME ": Int enab: 0x%08x | Sig enab: 0x%08x\n",
106                 sdhci_readl(host, SDHCI_INT_ENABLE),
107                 sdhci_readl(host, SDHCI_SIGNAL_ENABLE));
108         pr_debug(DRIVER_NAME ": AC12 err: 0x%08x | Slot int: 0x%08x\n",
109                 sdhci_readw(host, SDHCI_ACMD12_ERR),
110                 sdhci_readw(host, SDHCI_SLOT_INT_STATUS));
111         pr_debug(DRIVER_NAME ": Caps:     0x%08x | Caps_1:   0x%08x\n",
112                 sdhci_readl(host, SDHCI_CAPABILITIES),
113                 sdhci_readl(host, SDHCI_CAPABILITIES_1));
114         pr_debug(DRIVER_NAME ": Cmd:      0x%08x | Max curr: 0x%08x\n",
115                 sdhci_readw(host, SDHCI_COMMAND),
116                 sdhci_readl(host, SDHCI_MAX_CURRENT));
117         pr_debug(DRIVER_NAME ": Host ctl2: 0x%08x\n",
118                 sdhci_readw(host, SDHCI_HOST_CONTROL2));
119 
120         if (host->flags & SDHCI_USE_ADMA) {
121                 if (host->flags & SDHCI_USE_64_BIT_DMA)
122                         pr_debug(DRIVER_NAME ": ADMA Err: 0x%08x | ADMA Ptr: 0x%08x%08x\n",
123                                  readl(host->ioaddr + SDHCI_ADMA_ERROR),
124                                  readl(host->ioaddr + SDHCI_ADMA_ADDRESS_HI),
125                                  readl(host->ioaddr + SDHCI_ADMA_ADDRESS));
126                 else
127                         pr_debug(DRIVER_NAME ": ADMA Err: 0x%08x | ADMA Ptr: 0x%08x\n",
128                                  readl(host->ioaddr + SDHCI_ADMA_ERROR),
129                                  readl(host->ioaddr + SDHCI_ADMA_ADDRESS));
130         }
131 
132         pr_debug(DRIVER_NAME ": ===========================================\n");
133 }
134 
135 /*****************************************************************************\
136  *                                                                           *
137  * Low level functions                                                       *
138  *                                                                           *
139 \*****************************************************************************/
140 
141 static void sdhci_set_card_detection(struct sdhci_host *host, bool enable)
142 {
143         u32 present;
144 
145         if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) ||
146             (host->mmc->caps & MMC_CAP_NONREMOVABLE))
147                 return;
148 
149         if (enable) {
150                 present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
151                                       SDHCI_CARD_PRESENT;
152 
153                 host->ier |= present ? SDHCI_INT_CARD_REMOVE :
154                                        SDHCI_INT_CARD_INSERT;
155         } else {
156                 host->ier &= ~(SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT);
157         }
158 
159         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
160         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
161 }
162 
163 static void sdhci_enable_card_detection(struct sdhci_host *host)
164 {
165         sdhci_set_card_detection(host, true);
166 }
167 
168 static void sdhci_disable_card_detection(struct sdhci_host *host)
169 {
170         sdhci_set_card_detection(host, false);
171 }
172 
173 void sdhci_reset(struct sdhci_host *host, u8 mask)
174 {
175         unsigned long timeout;
176 
177         sdhci_writeb(host, mask, SDHCI_SOFTWARE_RESET);
178 
179         if (mask & SDHCI_RESET_ALL) {
180                 host->clock = 0;
181                 /* Reset-all turns off SD Bus Power */
182                 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
183                         sdhci_runtime_pm_bus_off(host);
184         }
185 
186         /* Wait max 100 ms */
187         timeout = 100;
188 
189         /* hw clears the bit when it's done */
190         while (sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask) {
191                 if (timeout == 0) {
192                         pr_err("%s: Reset 0x%x never completed.\n",
193                                 mmc_hostname(host->mmc), (int)mask);
194                         sdhci_dumpregs(host);
195                         return;
196                 }
197                 timeout--;
198                 mdelay(1);
199         }
200 }
201 EXPORT_SYMBOL_GPL(sdhci_reset);
202 
203 static void sdhci_do_reset(struct sdhci_host *host, u8 mask)
204 {
205         if (host->quirks & SDHCI_QUIRK_NO_CARD_NO_RESET) {
206                 if (!(sdhci_readl(host, SDHCI_PRESENT_STATE) &
207                         SDHCI_CARD_PRESENT))
208                         return;
209         }
210 
211         host->ops->reset(host, mask);
212 
213         if (mask & SDHCI_RESET_ALL) {
214                 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
215                         if (host->ops->enable_dma)
216                                 host->ops->enable_dma(host);
217                 }
218 
219                 /* Resetting the controller clears many */
220                 host->preset_enabled = false;
221         }
222 }
223 
224 static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios);
225 
226 static void sdhci_init(struct sdhci_host *host, int soft)
227 {
228         if (soft)
229                 sdhci_do_reset(host, SDHCI_RESET_CMD|SDHCI_RESET_DATA);
230         else
231                 sdhci_do_reset(host, SDHCI_RESET_ALL);
232 
233         host->ier = SDHCI_INT_BUS_POWER | SDHCI_INT_DATA_END_BIT |
234                     SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_TIMEOUT |
235                     SDHCI_INT_INDEX | SDHCI_INT_END_BIT | SDHCI_INT_CRC |
236                     SDHCI_INT_TIMEOUT | SDHCI_INT_DATA_END |
237                     SDHCI_INT_RESPONSE;
238 
239         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
240         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
241 
242         if (soft) {
243                 /* force clock reconfiguration */
244                 host->clock = 0;
245                 sdhci_set_ios(host->mmc, &host->mmc->ios);
246         }
247 }
248 
249 static void sdhci_reinit(struct sdhci_host *host)
250 {
251         sdhci_init(host, 0);
252         /*
253          * Retuning stuffs are affected by different cards inserted and only
254          * applicable to UHS-I cards. So reset these fields to their initial
255          * value when card is removed.
256          */
257         if (host->flags & SDHCI_USING_RETUNING_TIMER) {
258                 host->flags &= ~SDHCI_USING_RETUNING_TIMER;
259 
260                 del_timer_sync(&host->tuning_timer);
261                 host->flags &= ~SDHCI_NEEDS_RETUNING;
262         }
263         sdhci_enable_card_detection(host);
264 }
265 
266 static void sdhci_activate_led(struct sdhci_host *host)
267 {
268         u8 ctrl;
269 
270         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
271         ctrl |= SDHCI_CTRL_LED;
272         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
273 }
274 
275 static void sdhci_deactivate_led(struct sdhci_host *host)
276 {
277         u8 ctrl;
278 
279         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
280         ctrl &= ~SDHCI_CTRL_LED;
281         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
282 }
283 
284 #ifdef SDHCI_USE_LEDS_CLASS
285 static void sdhci_led_control(struct led_classdev *led,
286         enum led_brightness brightness)
287 {
288         struct sdhci_host *host = container_of(led, struct sdhci_host, led);
289         unsigned long flags;
290 
291         spin_lock_irqsave(&host->lock, flags);
292 
293         if (host->runtime_suspended)
294                 goto out;
295 
296         if (brightness == LED_OFF)
297                 sdhci_deactivate_led(host);
298         else
299                 sdhci_activate_led(host);
300 out:
301         spin_unlock_irqrestore(&host->lock, flags);
302 }
303 #endif
304 
305 /*****************************************************************************\
306  *                                                                           *
307  * Core functions                                                            *
308  *                                                                           *
309 \*****************************************************************************/
310 
311 static void sdhci_read_block_pio(struct sdhci_host *host)
312 {
313         unsigned long flags;
314         size_t blksize, len, chunk;
315         u32 uninitialized_var(scratch);
316         u8 *buf;
317 
318         DBG("PIO reading\n");
319 
320         blksize = host->data->blksz;
321         chunk = 0;
322 
323         local_irq_save(flags);
324 
325         while (blksize) {
326                 if (!sg_miter_next(&host->sg_miter))
327                         BUG();
328 
329                 len = min(host->sg_miter.length, blksize);
330 
331                 blksize -= len;
332                 host->sg_miter.consumed = len;
333 
334                 buf = host->sg_miter.addr;
335 
336                 while (len) {
337                         if (chunk == 0) {
338                                 scratch = sdhci_readl(host, SDHCI_BUFFER);
339                                 chunk = 4;
340                         }
341 
342                         *buf = scratch & 0xFF;
343 
344                         buf++;
345                         scratch >>= 8;
346                         chunk--;
347                         len--;
348                 }
349         }
350 
351         sg_miter_stop(&host->sg_miter);
352 
353         local_irq_restore(flags);
354 }
355 
356 static void sdhci_write_block_pio(struct sdhci_host *host)
357 {
358         unsigned long flags;
359         size_t blksize, len, chunk;
360         u32 scratch;
361         u8 *buf;
362 
363         DBG("PIO writing\n");
364 
365         blksize = host->data->blksz;
366         chunk = 0;
367         scratch = 0;
368 
369         local_irq_save(flags);
370 
371         while (blksize) {
372                 if (!sg_miter_next(&host->sg_miter))
373                         BUG();
374 
375                 len = min(host->sg_miter.length, blksize);
376 
377                 blksize -= len;
378                 host->sg_miter.consumed = len;
379 
380                 buf = host->sg_miter.addr;
381 
382                 while (len) {
383                         scratch |= (u32)*buf << (chunk * 8);
384 
385                         buf++;
386                         chunk++;
387                         len--;
388 
389                         if ((chunk == 4) || ((len == 0) && (blksize == 0))) {
390                                 sdhci_writel(host, scratch, SDHCI_BUFFER);
391                                 chunk = 0;
392                                 scratch = 0;
393                         }
394                 }
395         }
396 
397         sg_miter_stop(&host->sg_miter);
398 
399         local_irq_restore(flags);
400 }
401 
402 static void sdhci_transfer_pio(struct sdhci_host *host)
403 {
404         u32 mask;
405 
406         BUG_ON(!host->data);
407 
408         if (host->blocks == 0)
409                 return;
410 
411         if (host->data->flags & MMC_DATA_READ)
412                 mask = SDHCI_DATA_AVAILABLE;
413         else
414                 mask = SDHCI_SPACE_AVAILABLE;
415 
416         /*
417          * Some controllers (JMicron JMB38x) mess up the buffer bits
418          * for transfers < 4 bytes. As long as it is just one block,
419          * we can ignore the bits.
420          */
421         if ((host->quirks & SDHCI_QUIRK_BROKEN_SMALL_PIO) &&
422                 (host->data->blocks == 1))
423                 mask = ~0;
424 
425         while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) {
426                 if (host->quirks & SDHCI_QUIRK_PIO_NEEDS_DELAY)
427                         udelay(100);
428 
429                 if (host->data->flags & MMC_DATA_READ)
430                         sdhci_read_block_pio(host);
431                 else
432                         sdhci_write_block_pio(host);
433 
434                 host->blocks--;
435                 if (host->blocks == 0)
436                         break;
437         }
438 
439         DBG("PIO transfer complete.\n");
440 }
441 
442 static char *sdhci_kmap_atomic(struct scatterlist *sg, unsigned long *flags)
443 {
444         local_irq_save(*flags);
445         return kmap_atomic(sg_page(sg)) + sg->offset;
446 }
447 
448 static void sdhci_kunmap_atomic(void *buffer, unsigned long *flags)
449 {
450         kunmap_atomic(buffer);
451         local_irq_restore(*flags);
452 }
453 
454 static void sdhci_adma_write_desc(struct sdhci_host *host, void *desc,
455                                   dma_addr_t addr, int len, unsigned cmd)
456 {
457         struct sdhci_adma2_64_desc *dma_desc = desc;
458 
459         /* 32-bit and 64-bit descriptors have these members in same position */
460         dma_desc->cmd = cpu_to_le16(cmd);
461         dma_desc->len = cpu_to_le16(len);
462         dma_desc->addr_lo = cpu_to_le32((u32)addr);
463 
464         if (host->flags & SDHCI_USE_64_BIT_DMA)
465                 dma_desc->addr_hi = cpu_to_le32((u64)addr >> 32);
466 }
467 
468 static void sdhci_adma_mark_end(void *desc)
469 {
470         struct sdhci_adma2_64_desc *dma_desc = desc;
471 
472         /* 32-bit and 64-bit descriptors have 'cmd' in same position */
473         dma_desc->cmd |= cpu_to_le16(ADMA2_END);
474 }
475 
476 static int sdhci_adma_table_pre(struct sdhci_host *host,
477         struct mmc_data *data)
478 {
479         int direction;
480 
481         void *desc;
482         void *align;
483         dma_addr_t addr;
484         dma_addr_t align_addr;
485         int len, offset;
486 
487         struct scatterlist *sg;
488         int i;
489         char *buffer;
490         unsigned long flags;
491 
492         /*
493          * The spec does not specify endianness of descriptor table.
494          * We currently guess that it is LE.
495          */
496 
497         if (data->flags & MMC_DATA_READ)
498                 direction = DMA_FROM_DEVICE;
499         else
500                 direction = DMA_TO_DEVICE;
501 
502         host->align_addr = dma_map_single(mmc_dev(host->mmc),
503                 host->align_buffer, host->align_buffer_sz, direction);
504         if (dma_mapping_error(mmc_dev(host->mmc), host->align_addr))
505                 goto fail;
506         BUG_ON(host->align_addr & host->align_mask);
507 
508         host->sg_count = dma_map_sg(mmc_dev(host->mmc),
509                 data->sg, data->sg_len, direction);
510         if (host->sg_count == 0)
511                 goto unmap_align;
512 
513         desc = host->adma_table;
514         align = host->align_buffer;
515 
516         align_addr = host->align_addr;
517 
518         for_each_sg(data->sg, sg, host->sg_count, i) {
519                 addr = sg_dma_address(sg);
520                 len = sg_dma_len(sg);
521 
522                 /*
523                  * The SDHCI specification states that ADMA
524                  * addresses must be 32-bit aligned. If they
525                  * aren't, then we use a bounce buffer for
526                  * the (up to three) bytes that screw up the
527                  * alignment.
528                  */
529                 offset = (host->align_sz - (addr & host->align_mask)) &
530                          host->align_mask;
531                 if (offset) {
532                         if (data->flags & MMC_DATA_WRITE) {
533                                 buffer = sdhci_kmap_atomic(sg, &flags);
534                                 WARN_ON(((long)buffer & (PAGE_SIZE - 1)) >
535                                         (PAGE_SIZE - offset));
536                                 memcpy(align, buffer, offset);
537                                 sdhci_kunmap_atomic(buffer, &flags);
538                         }
539 
540                         /* tran, valid */
541                         sdhci_adma_write_desc(host, desc, align_addr, offset,
542                                               ADMA2_TRAN_VALID);
543 
544                         BUG_ON(offset > 65536);
545 
546                         align += host->align_sz;
547                         align_addr += host->align_sz;
548 
549                         desc += host->desc_sz;
550 
551                         addr += offset;
552                         len -= offset;
553                 }
554 
555                 BUG_ON(len > 65536);
556 
557                 /* tran, valid */
558                 sdhci_adma_write_desc(host, desc, addr, len, ADMA2_TRAN_VALID);
559                 desc += host->desc_sz;
560 
561                 /*
562                  * If this triggers then we have a calculation bug
563                  * somewhere. :/
564                  */
565                 WARN_ON((desc - host->adma_table) >= host->adma_table_sz);
566         }
567 
568         if (host->quirks & SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC) {
569                 /*
570                 * Mark the last descriptor as the terminating descriptor
571                 */
572                 if (desc != host->adma_table) {
573                         desc -= host->desc_sz;
574                         sdhci_adma_mark_end(desc);
575                 }
576         } else {
577                 /*
578                 * Add a terminating entry.
579                 */
580 
581                 /* nop, end, valid */
582                 sdhci_adma_write_desc(host, desc, 0, 0, ADMA2_NOP_END_VALID);
583         }
584 
585         /*
586          * Resync align buffer as we might have changed it.
587          */
588         if (data->flags & MMC_DATA_WRITE) {
589                 dma_sync_single_for_device(mmc_dev(host->mmc),
590                         host->align_addr, host->align_buffer_sz, direction);
591         }
592 
593         return 0;
594 
595 unmap_align:
596         dma_unmap_single(mmc_dev(host->mmc), host->align_addr,
597                 host->align_buffer_sz, direction);
598 fail:
599         return -EINVAL;
600 }
601 
602 static void sdhci_adma_table_post(struct sdhci_host *host,
603         struct mmc_data *data)
604 {
605         int direction;
606 
607         struct scatterlist *sg;
608         int i, size;
609         void *align;
610         char *buffer;
611         unsigned long flags;
612         bool has_unaligned;
613 
614         if (data->flags & MMC_DATA_READ)
615                 direction = DMA_FROM_DEVICE;
616         else
617                 direction = DMA_TO_DEVICE;
618 
619         dma_unmap_single(mmc_dev(host->mmc), host->align_addr,
620                 host->align_buffer_sz, direction);
621 
622         /* Do a quick scan of the SG list for any unaligned mappings */
623         has_unaligned = false;
624         for_each_sg(data->sg, sg, host->sg_count, i)
625                 if (sg_dma_address(sg) & host->align_mask) {
626                         has_unaligned = true;
627                         break;
628                 }
629 
630         if (has_unaligned && data->flags & MMC_DATA_READ) {
631                 dma_sync_sg_for_cpu(mmc_dev(host->mmc), data->sg,
632                         data->sg_len, direction);
633 
634                 align = host->align_buffer;
635 
636                 for_each_sg(data->sg, sg, host->sg_count, i) {
637                         if (sg_dma_address(sg) & host->align_mask) {
638                                 size = host->align_sz -
639                                        (sg_dma_address(sg) & host->align_mask);
640 
641                                 buffer = sdhci_kmap_atomic(sg, &flags);
642                                 WARN_ON(((long)buffer & (PAGE_SIZE - 1)) >
643                                         (PAGE_SIZE - size));
644                                 memcpy(buffer, align, size);
645                                 sdhci_kunmap_atomic(buffer, &flags);
646 
647                                 align += host->align_sz;
648                         }
649                 }
650         }
651 
652         dma_unmap_sg(mmc_dev(host->mmc), data->sg,
653                 data->sg_len, direction);
654 }
655 
656 static u8 sdhci_calc_timeout(struct sdhci_host *host, struct mmc_command *cmd)
657 {
658         u8 count;
659         struct mmc_data *data = cmd->data;
660         unsigned target_timeout, current_timeout;
661 
662         /*
663          * If the host controller provides us with an incorrect timeout
664          * value, just skip the check and use 0xE.  The hardware may take
665          * longer to time out, but that's much better than having a too-short
666          * timeout value.
667          */
668         if (host->quirks & SDHCI_QUIRK_BROKEN_TIMEOUT_VAL)
669                 return 0xE;
670 
671         /* Unspecified timeout, assume max */
672         if (!data && !cmd->busy_timeout)
673                 return 0xE;
674 
675         /* timeout in us */
676         if (!data)
677                 target_timeout = cmd->busy_timeout * 1000;
678         else {
679                 target_timeout = data->timeout_ns / 1000;
680                 if (host->clock)
681                         target_timeout += data->timeout_clks / host->clock;
682         }
683 
684         /*
685          * Figure out needed cycles.
686          * We do this in steps in order to fit inside a 32 bit int.
687          * The first step is the minimum timeout, which will have a
688          * minimum resolution of 6 bits:
689          * (1) 2^13*1000 > 2^22,
690          * (2) host->timeout_clk < 2^16
691          *     =>
692          *     (1) / (2) > 2^6
693          */
694         count = 0;
695         current_timeout = (1 << 13) * 1000 / host->timeout_clk;
696         while (current_timeout < target_timeout) {
697                 count++;
698                 current_timeout <<= 1;
699                 if (count >= 0xF)
700                         break;
701         }
702 
703         if (count >= 0xF) {
704                 DBG("%s: Too large timeout 0x%x requested for CMD%d!\n",
705                     mmc_hostname(host->mmc), count, cmd->opcode);
706                 count = 0xE;
707         }
708 
709         return count;
710 }
711 
712 static void sdhci_set_transfer_irqs(struct sdhci_host *host)
713 {
714         u32 pio_irqs = SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL;
715         u32 dma_irqs = SDHCI_INT_DMA_END | SDHCI_INT_ADMA_ERROR;
716 
717         if (host->flags & SDHCI_REQ_USE_DMA)
718                 host->ier = (host->ier & ~pio_irqs) | dma_irqs;
719         else
720                 host->ier = (host->ier & ~dma_irqs) | pio_irqs;
721 
722         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
723         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
724 }
725 
726 static void sdhci_set_timeout(struct sdhci_host *host, struct mmc_command *cmd)
727 {
728         u8 count;
729 
730         if (host->ops->set_timeout) {
731                 host->ops->set_timeout(host, cmd);
732         } else {
733                 count = sdhci_calc_timeout(host, cmd);
734                 sdhci_writeb(host, count, SDHCI_TIMEOUT_CONTROL);
735         }
736 }
737 
738 static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd)
739 {
740         u8 ctrl;
741         struct mmc_data *data = cmd->data;
742         int ret;
743 
744         WARN_ON(host->data);
745 
746         if (data || (cmd->flags & MMC_RSP_BUSY))
747                 sdhci_set_timeout(host, cmd);
748 
749         if (!data)
750                 return;
751 
752         /* Sanity checks */
753         BUG_ON(data->blksz * data->blocks > 524288);
754         BUG_ON(data->blksz > host->mmc->max_blk_size);
755         BUG_ON(data->blocks > 65535);
756 
757         host->data = data;
758         host->data_early = 0;
759         host->data->bytes_xfered = 0;
760 
761         if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA))
762                 host->flags |= SDHCI_REQ_USE_DMA;
763 
764         /*
765          * FIXME: This doesn't account for merging when mapping the
766          * scatterlist.
767          */
768         if (host->flags & SDHCI_REQ_USE_DMA) {
769                 int broken, i;
770                 struct scatterlist *sg;
771 
772                 broken = 0;
773                 if (host->flags & SDHCI_USE_ADMA) {
774                         if (host->quirks & SDHCI_QUIRK_32BIT_ADMA_SIZE)
775                                 broken = 1;
776                 } else {
777                         if (host->quirks & SDHCI_QUIRK_32BIT_DMA_SIZE)
778                                 broken = 1;
779                 }
780 
781                 if (unlikely(broken)) {
782                         for_each_sg(data->sg, sg, data->sg_len, i) {
783                                 if (sg->length & 0x3) {
784                                         DBG("Reverting to PIO because of "
785                                                 "transfer size (%d)\n",
786                                                 sg->length);
787                                         host->flags &= ~SDHCI_REQ_USE_DMA;
788                                         break;
789                                 }
790                         }
791                 }
792         }
793 
794         /*
795          * The assumption here being that alignment is the same after
796          * translation to device address space.
797          */
798         if (host->flags & SDHCI_REQ_USE_DMA) {
799                 int broken, i;
800                 struct scatterlist *sg;
801 
802                 broken = 0;
803                 if (host->flags & SDHCI_USE_ADMA) {
804                         /*
805                          * As we use 3 byte chunks to work around
806                          * alignment problems, we need to check this
807                          * quirk.
808                          */
809                         if (host->quirks & SDHCI_QUIRK_32BIT_ADMA_SIZE)
810                                 broken = 1;
811                 } else {
812                         if (host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR)
813                                 broken = 1;
814                 }
815 
816                 if (unlikely(broken)) {
817                         for_each_sg(data->sg, sg, data->sg_len, i) {
818                                 if (sg->offset & 0x3) {
819                                         DBG("Reverting to PIO because of "
820                                                 "bad alignment\n");
821                                         host->flags &= ~SDHCI_REQ_USE_DMA;
822                                         break;
823                                 }
824                         }
825                 }
826         }
827 
828         if (host->flags & SDHCI_REQ_USE_DMA) {
829                 if (host->flags & SDHCI_USE_ADMA) {
830                         ret = sdhci_adma_table_pre(host, data);
831                         if (ret) {
832                                 /*
833                                  * This only happens when someone fed
834                                  * us an invalid request.
835                                  */
836                                 WARN_ON(1);
837                                 host->flags &= ~SDHCI_REQ_USE_DMA;
838                         } else {
839                                 sdhci_writel(host, host->adma_addr,
840                                         SDHCI_ADMA_ADDRESS);
841                                 if (host->flags & SDHCI_USE_64_BIT_DMA)
842                                         sdhci_writel(host,
843                                                      (u64)host->adma_addr >> 32,
844                                                      SDHCI_ADMA_ADDRESS_HI);
845                         }
846                 } else {
847                         int sg_cnt;
848 
849                         sg_cnt = dma_map_sg(mmc_dev(host->mmc),
850                                         data->sg, data->sg_len,
851                                         (data->flags & MMC_DATA_READ) ?
852                                                 DMA_FROM_DEVICE :
853                                                 DMA_TO_DEVICE);
854                         if (sg_cnt == 0) {
855                                 /*
856                                  * This only happens when someone fed
857                                  * us an invalid request.
858                                  */
859                                 WARN_ON(1);
860                                 host->flags &= ~SDHCI_REQ_USE_DMA;
861                         } else {
862                                 WARN_ON(sg_cnt != 1);
863                                 sdhci_writel(host, sg_dma_address(data->sg),
864                                         SDHCI_DMA_ADDRESS);
865                         }
866                 }
867         }
868 
869         /*
870          * Always adjust the DMA selection as some controllers
871          * (e.g. JMicron) can't do PIO properly when the selection
872          * is ADMA.
873          */
874         if (host->version >= SDHCI_SPEC_200) {
875                 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
876                 ctrl &= ~SDHCI_CTRL_DMA_MASK;
877                 if ((host->flags & SDHCI_REQ_USE_DMA) &&
878                         (host->flags & SDHCI_USE_ADMA)) {
879                         if (host->flags & SDHCI_USE_64_BIT_DMA)
880                                 ctrl |= SDHCI_CTRL_ADMA64;
881                         else
882                                 ctrl |= SDHCI_CTRL_ADMA32;
883                 } else {
884                         ctrl |= SDHCI_CTRL_SDMA;
885                 }
886                 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
887         }
888 
889         if (!(host->flags & SDHCI_REQ_USE_DMA)) {
890                 int flags;
891 
892                 flags = SG_MITER_ATOMIC;
893                 if (host->data->flags & MMC_DATA_READ)
894                         flags |= SG_MITER_TO_SG;
895                 else
896                         flags |= SG_MITER_FROM_SG;
897                 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
898                 host->blocks = data->blocks;
899         }
900 
901         sdhci_set_transfer_irqs(host);
902 
903         /* Set the DMA boundary value and block size */
904         sdhci_writew(host, SDHCI_MAKE_BLKSZ(SDHCI_DEFAULT_BOUNDARY_ARG,
905                 data->blksz), SDHCI_BLOCK_SIZE);
906         sdhci_writew(host, data->blocks, SDHCI_BLOCK_COUNT);
907 }
908 
909 static void sdhci_set_transfer_mode(struct sdhci_host *host,
910         struct mmc_command *cmd)
911 {
912         u16 mode;
913         struct mmc_data *data = cmd->data;
914 
915         if (data == NULL) {
916                 if (host->quirks2 &
917                         SDHCI_QUIRK2_CLEAR_TRANSFERMODE_REG_BEFORE_CMD) {
918                         sdhci_writew(host, 0x0, SDHCI_TRANSFER_MODE);
919                 } else {
920                 /* clear Auto CMD settings for no data CMDs */
921                         mode = sdhci_readw(host, SDHCI_TRANSFER_MODE);
922                         sdhci_writew(host, mode & ~(SDHCI_TRNS_AUTO_CMD12 |
923                                 SDHCI_TRNS_AUTO_CMD23), SDHCI_TRANSFER_MODE);
924                 }
925                 return;
926         }
927 
928         WARN_ON(!host->data);
929 
930         mode = SDHCI_TRNS_BLK_CNT_EN;
931         if (mmc_op_multi(cmd->opcode) || data->blocks > 1) {
932                 mode |= SDHCI_TRNS_MULTI;
933                 /*
934                  * If we are sending CMD23, CMD12 never gets sent
935                  * on successful completion (so no Auto-CMD12).
936                  */
937                 if (!host->mrq->sbc && (host->flags & SDHCI_AUTO_CMD12))
938                         mode |= SDHCI_TRNS_AUTO_CMD12;
939                 else if (host->mrq->sbc && (host->flags & SDHCI_AUTO_CMD23)) {
940                         mode |= SDHCI_TRNS_AUTO_CMD23;
941                         sdhci_writel(host, host->mrq->sbc->arg, SDHCI_ARGUMENT2);
942                 }
943         }
944 
945         if (data->flags & MMC_DATA_READ)
946                 mode |= SDHCI_TRNS_READ;
947         if (host->flags & SDHCI_REQ_USE_DMA)
948                 mode |= SDHCI_TRNS_DMA;
949 
950         sdhci_writew(host, mode, SDHCI_TRANSFER_MODE);
951 }
952 
953 static void sdhci_finish_data(struct sdhci_host *host)
954 {
955         struct mmc_data *data;
956 
957         BUG_ON(!host->data);
958 
959         data = host->data;
960         host->data = NULL;
961 
962         if (host->flags & SDHCI_REQ_USE_DMA) {
963                 if (host->flags & SDHCI_USE_ADMA)
964                         sdhci_adma_table_post(host, data);
965                 else {
966                         dma_unmap_sg(mmc_dev(host->mmc), data->sg,
967                                 data->sg_len, (data->flags & MMC_DATA_READ) ?
968                                         DMA_FROM_DEVICE : DMA_TO_DEVICE);
969                 }
970         }
971 
972         /*
973          * The specification states that the block count register must
974          * be updated, but it does not specify at what point in the
975          * data flow. That makes the register entirely useless to read
976          * back so we have to assume that nothing made it to the card
977          * in the event of an error.
978          */
979         if (data->error)
980                 data->bytes_xfered = 0;
981         else
982                 data->bytes_xfered = data->blksz * data->blocks;
983 
984         /*
985          * Need to send CMD12 if -
986          * a) open-ended multiblock transfer (no CMD23)
987          * b) error in multiblock transfer
988          */
989         if (data->stop &&
990             (data->error ||
991              !host->mrq->sbc)) {
992 
993                 /*
994                  * The controller needs a reset of internal state machines
995                  * upon error conditions.
996                  */
997                 if (data->error) {
998                         sdhci_do_reset(host, SDHCI_RESET_CMD);
999                         sdhci_do_reset(host, SDHCI_RESET_DATA);
1000                 }
1001 
1002                 sdhci_send_command(host, data->stop);
1003         } else
1004                 tasklet_schedule(&host->finish_tasklet);
1005 }
1006 
1007 void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
1008 {
1009         int flags;
1010         u32 mask;
1011         unsigned long timeout;
1012 
1013         WARN_ON(host->cmd);
1014 
1015         /* Wait max 10 ms */
1016         timeout = 10;
1017 
1018         mask = SDHCI_CMD_INHIBIT;
1019         if ((cmd->data != NULL) || (cmd->flags & MMC_RSP_BUSY))
1020                 mask |= SDHCI_DATA_INHIBIT;
1021 
1022         /* We shouldn't wait for data inihibit for stop commands, even
1023            though they might use busy signaling */
1024         if (host->mrq->data && (cmd == host->mrq->data->stop))
1025                 mask &= ~SDHCI_DATA_INHIBIT;
1026 
1027         while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) {
1028                 if (timeout == 0) {
1029                         pr_err("%s: Controller never released "
1030                                 "inhibit bit(s).\n", mmc_hostname(host->mmc));
1031                         sdhci_dumpregs(host);
1032                         cmd->error = -EIO;
1033                         tasklet_schedule(&host->finish_tasklet);
1034                         return;
1035                 }
1036                 timeout--;
1037                 mdelay(1);
1038         }
1039 
1040         timeout = jiffies;
1041         if (!cmd->data && cmd->busy_timeout > 9000)
1042                 timeout += DIV_ROUND_UP(cmd->busy_timeout, 1000) * HZ + HZ;
1043         else
1044                 timeout += 10 * HZ;
1045         mod_timer(&host->timer, timeout);
1046 
1047         host->cmd = cmd;
1048         host->busy_handle = 0;
1049 
1050         sdhci_prepare_data(host, cmd);
1051 
1052         sdhci_writel(host, cmd->arg, SDHCI_ARGUMENT);
1053 
1054         sdhci_set_transfer_mode(host, cmd);
1055 
1056         if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
1057                 pr_err("%s: Unsupported response type!\n",
1058                         mmc_hostname(host->mmc));
1059                 cmd->error = -EINVAL;
1060                 tasklet_schedule(&host->finish_tasklet);
1061                 return;
1062         }
1063 
1064         if (!(cmd->flags & MMC_RSP_PRESENT))
1065                 flags = SDHCI_CMD_RESP_NONE;
1066         else if (cmd->flags & MMC_RSP_136)
1067                 flags = SDHCI_CMD_RESP_LONG;
1068         else if (cmd->flags & MMC_RSP_BUSY)
1069                 flags = SDHCI_CMD_RESP_SHORT_BUSY;
1070         else
1071                 flags = SDHCI_CMD_RESP_SHORT;
1072 
1073         if (cmd->flags & MMC_RSP_CRC)
1074                 flags |= SDHCI_CMD_CRC;
1075         if (cmd->flags & MMC_RSP_OPCODE)
1076                 flags |= SDHCI_CMD_INDEX;
1077 
1078         /* CMD19 is special in that the Data Present Select should be set */
1079         if (cmd->data || cmd->opcode == MMC_SEND_TUNING_BLOCK ||
1080             cmd->opcode == MMC_SEND_TUNING_BLOCK_HS200)
1081                 flags |= SDHCI_CMD_DATA;
1082 
1083         sdhci_writew(host, SDHCI_MAKE_CMD(cmd->opcode, flags), SDHCI_COMMAND);
1084 }
1085 EXPORT_SYMBOL_GPL(sdhci_send_command);
1086 
1087 static void sdhci_finish_command(struct sdhci_host *host)
1088 {
1089         int i;
1090 
1091         BUG_ON(host->cmd == NULL);
1092 
1093         if (host->cmd->flags & MMC_RSP_PRESENT) {
1094                 if (host->cmd->flags & MMC_RSP_136) {
1095                         /* CRC is stripped so we need to do some shifting. */
1096                         for (i = 0;i < 4;i++) {
1097                                 host->cmd->resp[i] = sdhci_readl(host,
1098                                         SDHCI_RESPONSE + (3-i)*4) << 8;
1099                                 if (i != 3)
1100                                         host->cmd->resp[i] |=
1101                                                 sdhci_readb(host,
1102                                                 SDHCI_RESPONSE + (3-i)*4-1);
1103                         }
1104                 } else {
1105                         host->cmd->resp[0] = sdhci_readl(host, SDHCI_RESPONSE);
1106                 }
1107         }
1108 
1109         host->cmd->error = 0;
1110 
1111         /* Finished CMD23, now send actual command. */
1112         if (host->cmd == host->mrq->sbc) {
1113                 host->cmd = NULL;
1114                 sdhci_send_command(host, host->mrq->cmd);
1115         } else {
1116 
1117                 /* Processed actual command. */
1118                 if (host->data && host->data_early)
1119                         sdhci_finish_data(host);
1120 
1121                 if (!host->cmd->data)
1122                         tasklet_schedule(&host->finish_tasklet);
1123 
1124                 host->cmd = NULL;
1125         }
1126 }
1127 
1128 static u16 sdhci_get_preset_value(struct sdhci_host *host)
1129 {
1130         u16 preset = 0;
1131 
1132         switch (host->timing) {
1133         case MMC_TIMING_UHS_SDR12:
1134                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR12);
1135                 break;
1136         case MMC_TIMING_UHS_SDR25:
1137                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR25);
1138                 break;
1139         case MMC_TIMING_UHS_SDR50:
1140                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR50);
1141                 break;
1142         case MMC_TIMING_UHS_SDR104:
1143         case MMC_TIMING_MMC_HS200:
1144                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR104);
1145                 break;
1146         case MMC_TIMING_UHS_DDR50:
1147                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_DDR50);
1148                 break;
1149         case MMC_TIMING_MMC_HS400:
1150                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_HS400);
1151                 break;
1152         default:
1153                 pr_warn("%s: Invalid UHS-I mode selected\n",
1154                         mmc_hostname(host->mmc));
1155                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR12);
1156                 break;
1157         }
1158         return preset;
1159 }
1160 
1161 void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
1162 {
1163         int div = 0; /* Initialized for compiler warning */
1164         int real_div = div, clk_mul = 1;
1165         u16 clk = 0;
1166         unsigned long timeout;
1167 
1168         host->mmc->actual_clock = 0;
1169 
1170         sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
1171 
1172         if (clock == 0)
1173                 return;
1174 
1175         if (host->version >= SDHCI_SPEC_300) {
1176                 if (host->preset_enabled) {
1177                         u16 pre_val;
1178 
1179                         clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1180                         pre_val = sdhci_get_preset_value(host);
1181                         div = (pre_val & SDHCI_PRESET_SDCLK_FREQ_MASK)
1182                                 >> SDHCI_PRESET_SDCLK_FREQ_SHIFT;
1183                         if (host->clk_mul &&
1184                                 (pre_val & SDHCI_PRESET_CLKGEN_SEL_MASK)) {
1185                                 clk = SDHCI_PROG_CLOCK_MODE;
1186                                 real_div = div + 1;
1187                                 clk_mul = host->clk_mul;
1188                         } else {
1189                                 real_div = max_t(int, 1, div << 1);
1190                         }
1191                         goto clock_set;
1192                 }
1193 
1194                 /*
1195                  * Check if the Host Controller supports Programmable Clock
1196                  * Mode.
1197                  */
1198                 if (host->clk_mul) {
1199                         for (div = 1; div <= 1024; div++) {
1200                                 if ((host->max_clk * host->clk_mul / div)
1201                                         <= clock)
1202                                         break;
1203                         }
1204                         /*
1205                          * Set Programmable Clock Mode in the Clock
1206                          * Control register.
1207                          */
1208                         clk = SDHCI_PROG_CLOCK_MODE;
1209                         real_div = div;
1210                         clk_mul = host->clk_mul;
1211                         div--;
1212                 } else {
1213                         /* Version 3.00 divisors must be a multiple of 2. */
1214                         if (host->max_clk <= clock)
1215                                 div = 1;
1216                         else {
1217                                 for (div = 2; div < SDHCI_MAX_DIV_SPEC_300;
1218                                      div += 2) {
1219                                         if ((host->max_clk / div) <= clock)
1220                                                 break;
1221                                 }
1222                         }
1223                         real_div = div;
1224                         div >>= 1;
1225                 }
1226         } else {
1227                 /* Version 2.00 divisors must be a power of 2. */
1228                 for (div = 1; div < SDHCI_MAX_DIV_SPEC_200; div *= 2) {
1229                         if ((host->max_clk / div) <= clock)
1230                                 break;
1231                 }
1232                 real_div = div;
1233                 div >>= 1;
1234         }
1235 
1236 clock_set:
1237         if (real_div)
1238                 host->mmc->actual_clock = (host->max_clk * clk_mul) / real_div;
1239         clk |= (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT;
1240         clk |= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN)
1241                 << SDHCI_DIVIDER_HI_SHIFT;
1242         clk |= SDHCI_CLOCK_INT_EN;
1243         sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1244 
1245         /* Wait max 20 ms */
1246         timeout = 20;
1247         while (!((clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL))
1248                 & SDHCI_CLOCK_INT_STABLE)) {
1249                 if (timeout == 0) {
1250                         pr_err("%s: Internal clock never "
1251                                 "stabilised.\n", mmc_hostname(host->mmc));
1252                         sdhci_dumpregs(host);
1253                         return;
1254                 }
1255                 timeout--;
1256                 mdelay(1);
1257         }
1258 
1259         clk |= SDHCI_CLOCK_CARD_EN;
1260         sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1261 }
1262 EXPORT_SYMBOL_GPL(sdhci_set_clock);
1263 
1264 static void sdhci_set_power(struct sdhci_host *host, unsigned char mode,
1265                             unsigned short vdd)
1266 {
1267         struct mmc_host *mmc = host->mmc;
1268         u8 pwr = 0;
1269 
1270         if (!IS_ERR(mmc->supply.vmmc)) {
1271                 spin_unlock_irq(&host->lock);
1272                 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
1273                 spin_lock_irq(&host->lock);
1274 
1275                 if (mode != MMC_POWER_OFF)
1276                         sdhci_writeb(host, SDHCI_POWER_ON, SDHCI_POWER_CONTROL);
1277                 else
1278                         sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
1279 
1280                 return;
1281         }
1282 
1283         if (mode != MMC_POWER_OFF) {
1284                 switch (1 << vdd) {
1285                 case MMC_VDD_165_195:
1286                         pwr = SDHCI_POWER_180;
1287                         break;
1288                 case MMC_VDD_29_30:
1289                 case MMC_VDD_30_31:
1290                         pwr = SDHCI_POWER_300;
1291                         break;
1292                 case MMC_VDD_32_33:
1293                 case MMC_VDD_33_34:
1294                         pwr = SDHCI_POWER_330;
1295                         break;
1296                 default:
1297                         BUG();
1298                 }
1299         }
1300 
1301         if (host->pwr == pwr)
1302                 return;
1303 
1304         host->pwr = pwr;
1305 
1306         if (pwr == 0) {
1307                 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
1308                 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
1309                         sdhci_runtime_pm_bus_off(host);
1310                 vdd = 0;
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 
1343 /*****************************************************************************\
1344  *                                                                           *
1345  * MMC callbacks                                                             *
1346  *                                                                           *
1347 \*****************************************************************************/
1348 
1349 static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
1350 {
1351         struct sdhci_host *host;
1352         int present;
1353         unsigned long flags;
1354         u32 tuning_opcode;
1355 
1356         host = mmc_priv(mmc);
1357 
1358         sdhci_runtime_pm_get(host);
1359 
1360         present = mmc_gpio_get_cd(host->mmc);
1361 
1362         spin_lock_irqsave(&host->lock, flags);
1363 
1364         WARN_ON(host->mrq != NULL);
1365 
1366 #ifndef SDHCI_USE_LEDS_CLASS
1367         sdhci_activate_led(host);
1368 #endif
1369 
1370         /*
1371          * Ensure we don't send the STOP for non-SET_BLOCK_COUNTED
1372          * requests if Auto-CMD12 is enabled.
1373          */
1374         if (!mrq->sbc && (host->flags & SDHCI_AUTO_CMD12)) {
1375                 if (mrq->stop) {
1376                         mrq->data->stop = NULL;
1377                         mrq->stop = NULL;
1378                 }
1379         }
1380 
1381         host->mrq = mrq;
1382 
1383         /*
1384          * Firstly check card presence from cd-gpio.  The return could
1385          * be one of the following possibilities:
1386          *     negative: cd-gpio is not available
1387          *     zero: cd-gpio is used, and card is removed
1388          *     one: cd-gpio is used, and card is present
1389          */
1390         if (present < 0) {
1391                 /* If polling, assume that the card is always present. */
1392                 if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
1393                         present = 1;
1394                 else
1395                         present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
1396                                         SDHCI_CARD_PRESENT;
1397         }
1398 
1399         if (!present || host->flags & SDHCI_DEVICE_DEAD) {
1400                 host->mrq->cmd->error = -ENOMEDIUM;
1401                 tasklet_schedule(&host->finish_tasklet);
1402         } else {
1403                 u32 present_state;
1404 
1405                 present_state = sdhci_readl(host, SDHCI_PRESENT_STATE);
1406                 /*
1407                  * Check if the re-tuning timer has already expired and there
1408                  * is no on-going data transfer and DAT0 is not busy. If so,
1409                  * we need to execute tuning procedure before sending command.
1410                  */
1411                 if ((host->flags & SDHCI_NEEDS_RETUNING) &&
1412                     !(present_state & (SDHCI_DOING_WRITE | SDHCI_DOING_READ)) &&
1413                     (present_state & SDHCI_DATA_0_LVL_MASK)) {
1414                         if (mmc->card) {
1415                                 /* eMMC uses cmd21 but sd and sdio use cmd19 */
1416                                 tuning_opcode =
1417                                         mmc->card->type == MMC_TYPE_MMC ?
1418                                         MMC_SEND_TUNING_BLOCK_HS200 :
1419                                         MMC_SEND_TUNING_BLOCK;
1420 
1421                                 /* Here we need to set the host->mrq to NULL,
1422                                  * in case the pending finish_tasklet
1423                                  * finishes it incorrectly.
1424                                  */
1425                                 host->mrq = NULL;
1426 
1427                                 spin_unlock_irqrestore(&host->lock, flags);
1428                                 sdhci_execute_tuning(mmc, tuning_opcode);
1429                                 spin_lock_irqsave(&host->lock, flags);
1430 
1431                                 /* Restore original mmc_request structure */
1432                                 host->mrq = mrq;
1433                         }
1434                 }
1435 
1436                 if (mrq->sbc && !(host->flags & SDHCI_AUTO_CMD23))
1437                         sdhci_send_command(host, mrq->sbc);
1438                 else
1439                         sdhci_send_command(host, mrq->cmd);
1440         }
1441 
1442         mmiowb();
1443         spin_unlock_irqrestore(&host->lock, flags);
1444 }
1445 
1446 void sdhci_set_bus_width(struct sdhci_host *host, int width)
1447 {
1448         u8 ctrl;
1449 
1450         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
1451         if (width == MMC_BUS_WIDTH_8) {
1452                 ctrl &= ~SDHCI_CTRL_4BITBUS;
1453                 if (host->version >= SDHCI_SPEC_300)
1454                         ctrl |= SDHCI_CTRL_8BITBUS;
1455         } else {
1456                 if (host->version >= SDHCI_SPEC_300)
1457                         ctrl &= ~SDHCI_CTRL_8BITBUS;
1458                 if (width == MMC_BUS_WIDTH_4)
1459                         ctrl |= SDHCI_CTRL_4BITBUS;
1460                 else
1461                         ctrl &= ~SDHCI_CTRL_4BITBUS;
1462         }
1463         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1464 }
1465 EXPORT_SYMBOL_GPL(sdhci_set_bus_width);
1466 
1467 void sdhci_set_uhs_signaling(struct sdhci_host *host, unsigned timing)
1468 {
1469         u16 ctrl_2;
1470 
1471         ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1472         /* Select Bus Speed Mode for host */
1473         ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
1474         if ((timing == MMC_TIMING_MMC_HS200) ||
1475             (timing == MMC_TIMING_UHS_SDR104))
1476                 ctrl_2 |= SDHCI_CTRL_UHS_SDR104;
1477         else if (timing == MMC_TIMING_UHS_SDR12)
1478                 ctrl_2 |= SDHCI_CTRL_UHS_SDR12;
1479         else if (timing == MMC_TIMING_UHS_SDR25)
1480                 ctrl_2 |= SDHCI_CTRL_UHS_SDR25;
1481         else if (timing == MMC_TIMING_UHS_SDR50)
1482                 ctrl_2 |= SDHCI_CTRL_UHS_SDR50;
1483         else if ((timing == MMC_TIMING_UHS_DDR50) ||
1484                  (timing == MMC_TIMING_MMC_DDR52))
1485                 ctrl_2 |= SDHCI_CTRL_UHS_DDR50;
1486         else if (timing == MMC_TIMING_MMC_HS400)
1487                 ctrl_2 |= SDHCI_CTRL_HS400; /* Non-standard */
1488         sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
1489 }
1490 EXPORT_SYMBOL_GPL(sdhci_set_uhs_signaling);
1491 
1492 static void sdhci_do_set_ios(struct sdhci_host *host, struct mmc_ios *ios)
1493 {
1494         unsigned long flags;
1495         u8 ctrl;
1496         struct mmc_host *mmc = host->mmc;
1497 
1498         spin_lock_irqsave(&host->lock, flags);
1499 
1500         if (host->flags & SDHCI_DEVICE_DEAD) {
1501                 spin_unlock_irqrestore(&host->lock, flags);
1502                 if (!IS_ERR(mmc->supply.vmmc) &&
1503                     ios->power_mode == MMC_POWER_OFF)
1504                         mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
1505                 return;
1506         }
1507 
1508         /*
1509          * Reset the chip on each power off.
1510          * Should clear out any weird states.
1511          */
1512         if (ios->power_mode == MMC_POWER_OFF) {
1513                 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
1514                 sdhci_reinit(host);
1515         }
1516 
1517         if (host->version >= SDHCI_SPEC_300 &&
1518                 (ios->power_mode == MMC_POWER_UP) &&
1519                 !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN))
1520                 sdhci_enable_preset_value(host, false);
1521 
1522         if (!ios->clock || ios->clock != host->clock) {
1523                 host->ops->set_clock(host, ios->clock);
1524                 host->clock = ios->clock;
1525 
1526                 if (host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK &&
1527                     host->clock) {
1528                         host->timeout_clk = host->mmc->actual_clock ?
1529                                                 host->mmc->actual_clock / 1000 :
1530                                                 host->clock / 1000;
1531                         host->mmc->max_busy_timeout =
1532                                 host->ops->get_max_timeout_count ?
1533                                 host->ops->get_max_timeout_count(host) :
1534                                 1 << 27;
1535                         host->mmc->max_busy_timeout /= host->timeout_clk;
1536                 }
1537         }
1538 
1539         sdhci_set_power(host, ios->power_mode, ios->vdd);
1540 
1541         if (host->ops->platform_send_init_74_clocks)
1542                 host->ops->platform_send_init_74_clocks(host, ios->power_mode);
1543 
1544         host->ops->set_bus_width(host, ios->bus_width);
1545 
1546         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
1547 
1548         if ((ios->timing == MMC_TIMING_SD_HS ||
1549              ios->timing == MMC_TIMING_MMC_HS)
1550             && !(host->quirks & SDHCI_QUIRK_NO_HISPD_BIT))
1551                 ctrl |= SDHCI_CTRL_HISPD;
1552         else
1553                 ctrl &= ~SDHCI_CTRL_HISPD;
1554 
1555         if (host->version >= SDHCI_SPEC_300) {
1556                 u16 clk, ctrl_2;
1557 
1558                 /* In case of UHS-I modes, set High Speed Enable */
1559                 if ((ios->timing == MMC_TIMING_MMC_HS400) ||
1560                     (ios->timing == MMC_TIMING_MMC_HS200) ||
1561                     (ios->timing == MMC_TIMING_MMC_DDR52) ||
1562                     (ios->timing == MMC_TIMING_UHS_SDR50) ||
1563                     (ios->timing == MMC_TIMING_UHS_SDR104) ||
1564                     (ios->timing == MMC_TIMING_UHS_DDR50) ||
1565                     (ios->timing == MMC_TIMING_UHS_SDR25))
1566                         ctrl |= SDHCI_CTRL_HISPD;
1567 
1568                 if (!host->preset_enabled) {
1569                         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1570                         /*
1571                          * We only need to set Driver Strength if the
1572                          * preset value enable is not set.
1573                          */
1574                         ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1575                         ctrl_2 &= ~SDHCI_CTRL_DRV_TYPE_MASK;
1576                         if (ios->drv_type == MMC_SET_DRIVER_TYPE_A)
1577                                 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_A;
1578                         else if (ios->drv_type == MMC_SET_DRIVER_TYPE_C)
1579                                 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_C;
1580 
1581                         sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
1582                 } else {
1583                         /*
1584                          * According to SDHC Spec v3.00, if the Preset Value
1585                          * Enable in the Host Control 2 register is set, we
1586                          * need to reset SD Clock Enable before changing High
1587                          * Speed Enable to avoid generating clock gliches.
1588                          */
1589 
1590                         /* Reset SD Clock Enable */
1591                         clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1592                         clk &= ~SDHCI_CLOCK_CARD_EN;
1593                         sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1594 
1595                         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1596 
1597                         /* Re-enable SD Clock */
1598                         host->ops->set_clock(host, host->clock);
1599                 }
1600 
1601                 /* Reset SD Clock Enable */
1602                 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1603                 clk &= ~SDHCI_CLOCK_CARD_EN;
1604                 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1605 
1606                 host->ops->set_uhs_signaling(host, ios->timing);
1607                 host->timing = ios->timing;
1608 
1609                 if (!(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN) &&
1610                                 ((ios->timing == MMC_TIMING_UHS_SDR12) ||
1611                                  (ios->timing == MMC_TIMING_UHS_SDR25) ||
1612                                  (ios->timing == MMC_TIMING_UHS_SDR50) ||
1613                                  (ios->timing == MMC_TIMING_UHS_SDR104) ||
1614                                  (ios->timing == MMC_TIMING_UHS_DDR50))) {
1615                         u16 preset;
1616 
1617                         sdhci_enable_preset_value(host, true);
1618                         preset = sdhci_get_preset_value(host);
1619                         ios->drv_type = (preset & SDHCI_PRESET_DRV_MASK)
1620                                 >> SDHCI_PRESET_DRV_SHIFT;
1621                 }
1622 
1623                 /* Re-enable SD Clock */
1624                 host->ops->set_clock(host, host->clock);
1625         } else
1626                 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1627 
1628         /*
1629          * Some (ENE) controllers go apeshit on some ios operation,
1630          * signalling timeout and CRC errors even on CMD0. Resetting
1631          * it on each ios seems to solve the problem.
1632          */
1633         if(host->quirks & SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS)
1634                 sdhci_do_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
1635 
1636         mmiowb();
1637         spin_unlock_irqrestore(&host->lock, flags);
1638 }
1639 
1640 static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1641 {
1642         struct sdhci_host *host = mmc_priv(mmc);
1643 
1644         sdhci_runtime_pm_get(host);
1645         sdhci_do_set_ios(host, ios);
1646         sdhci_runtime_pm_put(host);
1647 }
1648 
1649 static int sdhci_do_get_cd(struct sdhci_host *host)
1650 {
1651         int gpio_cd = mmc_gpio_get_cd(host->mmc);
1652 
1653         if (host->flags & SDHCI_DEVICE_DEAD)
1654                 return 0;
1655 
1656         /* If polling/nonremovable, assume that the card is always present. */
1657         if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) ||
1658             (host->mmc->caps & MMC_CAP_NONREMOVABLE))
1659                 return 1;
1660 
1661         /* Try slot gpio detect */
1662         if (!IS_ERR_VALUE(gpio_cd))
1663                 return !!gpio_cd;
1664 
1665         /* Host native card detect */
1666         return !!(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT);
1667 }
1668 
1669 static int sdhci_get_cd(struct mmc_host *mmc)
1670 {
1671         struct sdhci_host *host = mmc_priv(mmc);
1672         int ret;
1673 
1674         sdhci_runtime_pm_get(host);
1675         ret = sdhci_do_get_cd(host);
1676         sdhci_runtime_pm_put(host);
1677         return ret;
1678 }
1679 
1680 static int sdhci_check_ro(struct sdhci_host *host)
1681 {
1682         unsigned long flags;
1683         int is_readonly;
1684 
1685         spin_lock_irqsave(&host->lock, flags);
1686 
1687         if (host->flags & SDHCI_DEVICE_DEAD)
1688                 is_readonly = 0;
1689         else if (host->ops->get_ro)
1690                 is_readonly = host->ops->get_ro(host);
1691         else
1692                 is_readonly = !(sdhci_readl(host, SDHCI_PRESENT_STATE)
1693                                 & SDHCI_WRITE_PROTECT);
1694 
1695         spin_unlock_irqrestore(&host->lock, flags);
1696 
1697         /* This quirk needs to be replaced by a callback-function later */
1698         return host->quirks & SDHCI_QUIRK_INVERTED_WRITE_PROTECT ?
1699                 !is_readonly : is_readonly;
1700 }
1701 
1702 #define SAMPLE_COUNT    5
1703 
1704 static int sdhci_do_get_ro(struct sdhci_host *host)
1705 {
1706         int i, ro_count;
1707 
1708         if (!(host->quirks & SDHCI_QUIRK_UNSTABLE_RO_DETECT))
1709                 return sdhci_check_ro(host);
1710 
1711         ro_count = 0;
1712         for (i = 0; i < SAMPLE_COUNT; i++) {
1713                 if (sdhci_check_ro(host)) {
1714                         if (++ro_count > SAMPLE_COUNT / 2)
1715                                 return 1;
1716                 }
1717                 msleep(30);
1718         }
1719         return 0;
1720 }
1721 
1722 static void sdhci_hw_reset(struct mmc_host *mmc)
1723 {
1724         struct sdhci_host *host = mmc_priv(mmc);
1725 
1726         if (host->ops && host->ops->hw_reset)
1727                 host->ops->hw_reset(host);
1728 }
1729 
1730 static int sdhci_get_ro(struct mmc_host *mmc)
1731 {
1732         struct sdhci_host *host = mmc_priv(mmc);
1733         int ret;
1734 
1735         sdhci_runtime_pm_get(host);
1736         ret = sdhci_do_get_ro(host);
1737         sdhci_runtime_pm_put(host);
1738         return ret;
1739 }
1740 
1741 static void sdhci_enable_sdio_irq_nolock(struct sdhci_host *host, int enable)
1742 {
1743         if (!(host->flags & SDHCI_DEVICE_DEAD)) {
1744                 if (enable)
1745                         host->ier |= SDHCI_INT_CARD_INT;
1746                 else
1747                         host->ier &= ~SDHCI_INT_CARD_INT;
1748 
1749                 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
1750                 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
1751                 mmiowb();
1752         }
1753 }
1754 
1755 static void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable)
1756 {
1757         struct sdhci_host *host = mmc_priv(mmc);
1758         unsigned long flags;
1759 
1760         sdhci_runtime_pm_get(host);
1761 
1762         spin_lock_irqsave(&host->lock, flags);
1763         if (enable)
1764                 host->flags |= SDHCI_SDIO_IRQ_ENABLED;
1765         else
1766                 host->flags &= ~SDHCI_SDIO_IRQ_ENABLED;
1767 
1768         sdhci_enable_sdio_irq_nolock(host, enable);
1769         spin_unlock_irqrestore(&host->lock, flags);
1770 
1771         sdhci_runtime_pm_put(host);
1772 }
1773 
1774 static int sdhci_do_start_signal_voltage_switch(struct sdhci_host *host,
1775                                                 struct mmc_ios *ios)
1776 {
1777         struct mmc_host *mmc = host->mmc;
1778         u16 ctrl;
1779         int ret;
1780 
1781         /*
1782          * Signal Voltage Switching is only applicable for Host Controllers
1783          * v3.00 and above.
1784          */
1785         if (host->version < SDHCI_SPEC_300)
1786                 return 0;
1787 
1788         ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1789 
1790         switch (ios->signal_voltage) {
1791         case MMC_SIGNAL_VOLTAGE_330:
1792                 /* Set 1.8V Signal Enable in the Host Control2 register to 0 */
1793                 ctrl &= ~SDHCI_CTRL_VDD_180;
1794                 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1795 
1796                 if (!IS_ERR(mmc->supply.vqmmc)) {
1797                         ret = regulator_set_voltage(mmc->supply.vqmmc, 2700000,
1798                                                     3600000);
1799                         if (ret) {
1800                                 pr_warn("%s: Switching to 3.3V signalling voltage failed\n",
1801                                         mmc_hostname(mmc));
1802                                 return -EIO;
1803                         }
1804                 }
1805                 /* Wait for 5ms */
1806                 usleep_range(5000, 5500);
1807 
1808                 /* 3.3V regulator output should be stable within 5 ms */
1809                 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1810                 if (!(ctrl & SDHCI_CTRL_VDD_180))
1811                         return 0;
1812 
1813                 pr_warn("%s: 3.3V regulator output did not became stable\n",
1814                         mmc_hostname(mmc));
1815 
1816                 return -EAGAIN;
1817         case MMC_SIGNAL_VOLTAGE_180:
1818                 if (!IS_ERR(mmc->supply.vqmmc)) {
1819                         ret = regulator_set_voltage(mmc->supply.vqmmc,
1820                                         1700000, 1950000);
1821                         if (ret) {
1822                                 pr_warn("%s: Switching to 1.8V signalling voltage failed\n",
1823                                         mmc_hostname(mmc));
1824                                 return -EIO;
1825                         }
1826                 }
1827 
1828                 /*
1829                  * Enable 1.8V Signal Enable in the Host Control2
1830                  * register
1831                  */
1832                 ctrl |= SDHCI_CTRL_VDD_180;
1833                 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1834 
1835                 /* 1.8V regulator output should be stable within 5 ms */
1836                 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1837                 if (ctrl & SDHCI_CTRL_VDD_180)
1838                         return 0;
1839 
1840                 pr_warn("%s: 1.8V regulator output did not became stable\n",
1841                         mmc_hostname(mmc));
1842 
1843                 return -EAGAIN;
1844         case MMC_SIGNAL_VOLTAGE_120:
1845                 if (!IS_ERR(mmc->supply.vqmmc)) {
1846                         ret = regulator_set_voltage(mmc->supply.vqmmc, 1100000,
1847                                                     1300000);
1848                         if (ret) {
1849                                 pr_warn("%s: Switching to 1.2V signalling voltage failed\n",
1850                                         mmc_hostname(mmc));
1851                                 return -EIO;
1852                         }
1853                 }
1854                 return 0;
1855         default:
1856                 /* No signal voltage switch required */
1857                 return 0;
1858         }
1859 }
1860 
1861 static int sdhci_start_signal_voltage_switch(struct mmc_host *mmc,
1862         struct mmc_ios *ios)
1863 {
1864         struct sdhci_host *host = mmc_priv(mmc);
1865         int err;
1866 
1867         if (host->version < SDHCI_SPEC_300)
1868                 return 0;
1869         sdhci_runtime_pm_get(host);
1870         err = sdhci_do_start_signal_voltage_switch(host, ios);
1871         sdhci_runtime_pm_put(host);
1872         return err;
1873 }
1874 
1875 static int sdhci_card_busy(struct mmc_host *mmc)
1876 {
1877         struct sdhci_host *host = mmc_priv(mmc);
1878         u32 present_state;
1879 
1880         sdhci_runtime_pm_get(host);
1881         /* Check whether DAT[3:0] is 0000 */
1882         present_state = sdhci_readl(host, SDHCI_PRESENT_STATE);
1883         sdhci_runtime_pm_put(host);
1884 
1885         return !(present_state & SDHCI_DATA_LVL_MASK);
1886 }
1887 
1888 static int sdhci_prepare_hs400_tuning(struct mmc_host *mmc, struct mmc_ios *ios)
1889 {
1890         struct sdhci_host *host = mmc_priv(mmc);
1891         unsigned long flags;
1892 
1893         spin_lock_irqsave(&host->lock, flags);
1894         host->flags |= SDHCI_HS400_TUNING;
1895         spin_unlock_irqrestore(&host->lock, flags);
1896 
1897         return 0;
1898 }
1899 
1900 static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
1901 {
1902         struct sdhci_host *host = mmc_priv(mmc);
1903         u16 ctrl;
1904         int tuning_loop_counter = MAX_TUNING_LOOP;
1905         int err = 0;
1906         unsigned long flags;
1907         unsigned int tuning_count = 0;
1908         bool hs400_tuning;
1909 
1910         sdhci_runtime_pm_get(host);
1911         spin_lock_irqsave(&host->lock, flags);
1912 
1913         hs400_tuning = host->flags & SDHCI_HS400_TUNING;
1914         host->flags &= ~SDHCI_HS400_TUNING;
1915 
1916         if (host->tuning_mode == SDHCI_TUNING_MODE_1)
1917                 tuning_count = host->tuning_count;
1918 
1919         /*
1920          * The Host Controller needs tuning only in case of SDR104 mode
1921          * and for SDR50 mode when Use Tuning for SDR50 is set in the
1922          * Capabilities register.
1923          * If the Host Controller supports the HS200 mode then the
1924          * tuning function has to be executed.
1925          */
1926         switch (host->timing) {
1927         /* HS400 tuning is done in HS200 mode */
1928         case MMC_TIMING_MMC_HS400:
1929                 err = -EINVAL;
1930                 goto out_unlock;
1931 
1932         case MMC_TIMING_MMC_HS200:
1933                 /*
1934                  * Periodic re-tuning for HS400 is not expected to be needed, so
1935                  * disable it here.
1936                  */
1937                 if (hs400_tuning)
1938                         tuning_count = 0;
1939                 break;
1940 
1941         case MMC_TIMING_UHS_SDR104:
1942                 break;
1943 
1944         case MMC_TIMING_UHS_SDR50:
1945                 if (host->flags & SDHCI_SDR50_NEEDS_TUNING ||
1946                     host->flags & SDHCI_SDR104_NEEDS_TUNING)
1947                         break;
1948                 /* FALLTHROUGH */
1949 
1950         default:
1951                 goto out_unlock;
1952         }
1953 
1954         if (host->ops->platform_execute_tuning) {
1955                 spin_unlock_irqrestore(&host->lock, flags);
1956                 err = host->ops->platform_execute_tuning(host, opcode);
1957                 sdhci_runtime_pm_put(host);
1958                 return err;
1959         }
1960 
1961         ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1962         ctrl |= SDHCI_CTRL_EXEC_TUNING;
1963         sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1964 
1965         /*
1966          * As per the Host Controller spec v3.00, tuning command
1967          * generates Buffer Read Ready interrupt, so enable that.
1968          *
1969          * Note: The spec clearly says that when tuning sequence
1970          * is being performed, the controller does not generate
1971          * interrupts other than Buffer Read Ready interrupt. But
1972          * to make sure we don't hit a controller bug, we _only_
1973          * enable Buffer Read Ready interrupt here.
1974          */
1975         sdhci_writel(host, SDHCI_INT_DATA_AVAIL, SDHCI_INT_ENABLE);
1976         sdhci_writel(host, SDHCI_INT_DATA_AVAIL, SDHCI_SIGNAL_ENABLE);
1977 
1978         /*
1979          * Issue CMD19 repeatedly till Execute Tuning is set to 0 or the number
1980          * of loops reaches 40 times or a timeout of 150ms occurs.
1981          */
1982         do {
1983                 struct mmc_command cmd = {0};
1984                 struct mmc_request mrq = {NULL};
1985 
1986                 cmd.opcode = opcode;
1987                 cmd.arg = 0;
1988                 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
1989                 cmd.retries = 0;
1990                 cmd.data = NULL;
1991                 cmd.error = 0;
1992 
1993                 if (tuning_loop_counter-- == 0)
1994                         break;
1995 
1996                 mrq.cmd = &cmd;
1997                 host->mrq = &mrq;
1998 
1999                 /*
2000                  * In response to CMD19, the card sends 64 bytes of tuning
2001                  * block to the Host Controller. So we set the block size
2002                  * to 64 here.
2003                  */
2004                 if (cmd.opcode == MMC_SEND_TUNING_BLOCK_HS200) {
2005                         if (mmc->ios.bus_width == MMC_BUS_WIDTH_8)
2006                                 sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, 128),
2007                                              SDHCI_BLOCK_SIZE);
2008                         else if (mmc->ios.bus_width == MMC_BUS_WIDTH_4)
2009                                 sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, 64),
2010                                              SDHCI_BLOCK_SIZE);
2011                 } else {
2012                         sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, 64),
2013                                      SDHCI_BLOCK_SIZE);
2014                 }
2015 
2016                 /*
2017                  * The tuning block is sent by the card to the host controller.
2018                  * So we set the TRNS_READ bit in the Transfer Mode register.
2019                  * This also takes care of setting DMA Enable and Multi Block
2020                  * Select in the same register to 0.
2021                  */
2022                 sdhci_writew(host, SDHCI_TRNS_READ, SDHCI_TRANSFER_MODE);
2023 
2024                 sdhci_send_command(host, &cmd);
2025 
2026                 host->cmd = NULL;
2027                 host->mrq = NULL;
2028 
2029                 spin_unlock_irqrestore(&host->lock, flags);
2030                 /* Wait for Buffer Read Ready interrupt */
2031                 wait_event_interruptible_timeout(host->buf_ready_int,
2032                                         (host->tuning_done == 1),
2033                                         msecs_to_jiffies(50));
2034                 spin_lock_irqsave(&host->lock, flags);
2035 
2036                 if (!host->tuning_done) {
2037                         pr_info(DRIVER_NAME ": Timeout waiting for "
2038                                 "Buffer Read Ready interrupt during tuning "
2039                                 "procedure, falling back to fixed sampling "
2040                                 "clock\n");
2041                         ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2042                         ctrl &= ~SDHCI_CTRL_TUNED_CLK;
2043                         ctrl &= ~SDHCI_CTRL_EXEC_TUNING;
2044                         sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2045 
2046                         err = -EIO;
2047                         goto out;
2048                 }
2049 
2050                 host->tuning_done = 0;
2051 
2052                 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2053 
2054                 /* eMMC spec does not require a delay between tuning cycles */
2055                 if (opcode == MMC_SEND_TUNING_BLOCK)
2056                         mdelay(1);
2057         } while (ctrl & SDHCI_CTRL_EXEC_TUNING);
2058 
2059         /*
2060          * The Host Driver has exhausted the maximum number of loops allowed,
2061          * so use fixed sampling frequency.
2062          */
2063         if (tuning_loop_counter < 0) {
2064                 ctrl &= ~SDHCI_CTRL_TUNED_CLK;
2065                 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2066         }
2067         if (!(ctrl & SDHCI_CTRL_TUNED_CLK)) {
2068                 pr_info(DRIVER_NAME ": Tuning procedure"
2069                         " failed, falling back to fixed sampling"
2070                         " clock\n");
2071                 err = -EIO;
2072         }
2073 
2074 out:
2075         host->flags &= ~SDHCI_NEEDS_RETUNING;
2076 
2077         if (tuning_count) {
2078                 host->flags |= SDHCI_USING_RETUNING_TIMER;
2079                 mod_timer(&host->tuning_timer, jiffies + tuning_count * HZ);
2080         }
2081 
2082         /*
2083          * In case tuning fails, host controllers which support re-tuning can
2084          * try tuning again at a later time, when the re-tuning timer expires.
2085          * So for these controllers, we return 0. Since there might be other
2086          * controllers who do not have this capability, we return error for
2087          * them. SDHCI_USING_RETUNING_TIMER means the host is currently using
2088          * a retuning timer to do the retuning for the card.
2089          */
2090         if (err && (host->flags & SDHCI_USING_RETUNING_TIMER))
2091                 err = 0;
2092 
2093         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
2094         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
2095 out_unlock:
2096         spin_unlock_irqrestore(&host->lock, flags);
2097         sdhci_runtime_pm_put(host);
2098 
2099         return err;
2100 }
2101 
2102 
2103 static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable)
2104 {
2105         /* Host Controller v3.00 defines preset value registers */
2106         if (host->version < SDHCI_SPEC_300)
2107                 return;
2108 
2109         /*
2110          * We only enable or disable Preset Value if they are not already
2111          * enabled or disabled respectively. Otherwise, we bail out.
2112          */
2113         if (host->preset_enabled != enable) {
2114                 u16 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2115 
2116                 if (enable)
2117                         ctrl |= SDHCI_CTRL_PRESET_VAL_ENABLE;
2118                 else
2119                         ctrl &= ~SDHCI_CTRL_PRESET_VAL_ENABLE;
2120 
2121                 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2122 
2123                 if (enable)
2124                         host->flags |= SDHCI_PV_ENABLED;
2125                 else
2126                         host->flags &= ~SDHCI_PV_ENABLED;
2127 
2128                 host->preset_enabled = enable;
2129         }
2130 }
2131 
2132 static void sdhci_card_event(struct mmc_host *mmc)
2133 {
2134         struct sdhci_host *host = mmc_priv(mmc);
2135         unsigned long flags;
2136         int present;
2137 
2138         /* First check if client has provided their own card event */
2139         if (host->ops->card_event)
2140                 host->ops->card_event(host);
2141 
2142         present = sdhci_do_get_cd(host);
2143 
2144         spin_lock_irqsave(&host->lock, flags);
2145 
2146         /* Check host->mrq first in case we are runtime suspended */
2147         if (host->mrq && !present) {
2148                 pr_err("%s: Card removed during transfer!\n",
2149                         mmc_hostname(host->mmc));
2150                 pr_err("%s: Resetting controller.\n",
2151                         mmc_hostname(host->mmc));
2152 
2153                 sdhci_do_reset(host, SDHCI_RESET_CMD);
2154                 sdhci_do_reset(host, SDHCI_RESET_DATA);
2155 
2156                 host->mrq->cmd->error = -ENOMEDIUM;
2157                 tasklet_schedule(&host->finish_tasklet);
2158         }
2159 
2160         spin_unlock_irqrestore(&host->lock, flags);
2161 }
2162 
2163 static const struct mmc_host_ops sdhci_ops = {
2164         .request        = sdhci_request,
2165         .set_ios        = sdhci_set_ios,
2166         .get_cd         = sdhci_get_cd,
2167         .get_ro         = sdhci_get_ro,
2168         .hw_reset       = sdhci_hw_reset,
2169         .enable_sdio_irq = sdhci_enable_sdio_irq,
2170         .start_signal_voltage_switch    = sdhci_start_signal_voltage_switch,
2171         .prepare_hs400_tuning           = sdhci_prepare_hs400_tuning,
2172         .execute_tuning                 = sdhci_execute_tuning,
2173         .card_event                     = sdhci_card_event,
2174         .card_busy      = sdhci_card_busy,
2175 };
2176 
2177 /*****************************************************************************\
2178  *                                                                           *
2179  * Tasklets                                                                  *
2180  *                                                                           *
2181 \*****************************************************************************/
2182 
2183 static void sdhci_tasklet_finish(unsigned long param)
2184 {
2185         struct sdhci_host *host;
2186         unsigned long flags;
2187         struct mmc_request *mrq;
2188 
2189         host = (struct sdhci_host*)param;
2190 
2191         spin_lock_irqsave(&host->lock, flags);
2192 
2193         /*
2194          * If this tasklet gets rescheduled while running, it will
2195          * be run again afterwards but without any active request.
2196          */
2197         if (!host->mrq) {
2198                 spin_unlock_irqrestore(&host->lock, flags);
2199                 return;
2200         }
2201 
2202         del_timer(&host->timer);
2203 
2204         mrq = host->mrq;
2205 
2206         /*
2207          * The controller needs a reset of internal state machines
2208          * upon error conditions.
2209          */
2210         if (!(host->flags & SDHCI_DEVICE_DEAD) &&
2211             ((mrq->cmd && mrq->cmd->error) ||
2212              (mrq->sbc && mrq->sbc->error) ||
2213              (mrq->data && ((mrq->data->error && !mrq->data->stop) ||
2214                             (mrq->data->stop && mrq->data->stop->error))) ||
2215              (host->quirks & SDHCI_QUIRK_RESET_AFTER_REQUEST))) {
2216 
2217                 /* Some controllers need this kick or reset won't work here */
2218                 if (host->quirks & SDHCI_QUIRK_CLOCK_BEFORE_RESET)
2219                         /* This is to force an update */
2220                         host->ops->set_clock(host, host->clock);
2221 
2222                 /* Spec says we should do both at the same time, but Ricoh
2223                    controllers do not like that. */
2224                 sdhci_do_reset(host, SDHCI_RESET_CMD);
2225                 sdhci_do_reset(host, SDHCI_RESET_DATA);
2226         }
2227 
2228         host->mrq = NULL;
2229         host->cmd = NULL;
2230         host->data = NULL;
2231 
2232 #ifndef SDHCI_USE_LEDS_CLASS
2233         sdhci_deactivate_led(host);
2234 #endif
2235 
2236         mmiowb();
2237         spin_unlock_irqrestore(&host->lock, flags);
2238 
2239         mmc_request_done(host->mmc, mrq);
2240         sdhci_runtime_pm_put(host);
2241 }
2242 
2243 static void sdhci_timeout_timer(unsigned long data)
2244 {
2245         struct sdhci_host *host;
2246         unsigned long flags;
2247 
2248         host = (struct sdhci_host*)data;
2249 
2250         spin_lock_irqsave(&host->lock, flags);
2251 
2252         if (host->mrq) {
2253                 pr_err("%s: Timeout waiting for hardware "
2254                         "interrupt.\n", mmc_hostname(host->mmc));
2255                 sdhci_dumpregs(host);
2256 
2257                 if (host->data) {
2258                         host->data->error = -ETIMEDOUT;
2259                         sdhci_finish_data(host);
2260                 } else {
2261                         if (host->cmd)
2262                                 host->cmd->error = -ETIMEDOUT;
2263                         else
2264                                 host->mrq->cmd->error = -ETIMEDOUT;
2265 
2266                         tasklet_schedule(&host->finish_tasklet);
2267                 }
2268         }
2269 
2270         mmiowb();
2271         spin_unlock_irqrestore(&host->lock, flags);
2272 }
2273 
2274 static void sdhci_tuning_timer(unsigned long data)
2275 {
2276         struct sdhci_host *host;
2277         unsigned long flags;
2278 
2279         host = (struct sdhci_host *)data;
2280 
2281         spin_lock_irqsave(&host->lock, flags);
2282 
2283         host->flags |= SDHCI_NEEDS_RETUNING;
2284 
2285         spin_unlock_irqrestore(&host->lock, flags);
2286 }
2287 
2288 /*****************************************************************************\
2289  *                                                                           *
2290  * Interrupt handling                                                        *
2291  *                                                                           *
2292 \*****************************************************************************/
2293 
2294 static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask, u32 *mask)
2295 {
2296         BUG_ON(intmask == 0);
2297 
2298         if (!host->cmd) {
2299                 pr_err("%s: Got command interrupt 0x%08x even "
2300                         "though no command operation was in progress.\n",
2301                         mmc_hostname(host->mmc), (unsigned)intmask);
2302                 sdhci_dumpregs(host);
2303                 return;
2304         }
2305 
2306         if (intmask & SDHCI_INT_TIMEOUT)
2307                 host->cmd->error = -ETIMEDOUT;
2308         else if (intmask & (SDHCI_INT_CRC | SDHCI_INT_END_BIT |
2309                         SDHCI_INT_INDEX))
2310                 host->cmd->error = -EILSEQ;
2311 
2312         if (host->cmd->error) {
2313                 tasklet_schedule(&host->finish_tasklet);
2314                 return;
2315         }
2316 
2317         /*
2318          * The host can send and interrupt when the busy state has
2319          * ended, allowing us to wait without wasting CPU cycles.
2320          * Unfortunately this is overloaded on the "data complete"
2321          * interrupt, so we need to take some care when handling
2322          * it.
2323          *
2324          * Note: The 1.0 specification is a bit ambiguous about this
2325          *       feature so there might be some problems with older
2326          *       controllers.
2327          */
2328         if (host->cmd->flags & MMC_RSP_BUSY) {
2329                 if (host->cmd->data)
2330                         DBG("Cannot wait for busy signal when also "
2331                                 "doing a data transfer");
2332                 else if (!(host->quirks & SDHCI_QUIRK_NO_BUSY_IRQ)
2333                                 && !host->busy_handle) {
2334                         /* Mark that command complete before busy is ended */
2335                         host->busy_handle = 1;
2336                         return;
2337                 }
2338 
2339                 /* The controller does not support the end-of-busy IRQ,
2340                  * fall through and take the SDHCI_INT_RESPONSE */
2341         } else if ((host->quirks2 & SDHCI_QUIRK2_STOP_WITH_TC) &&
2342                    host->cmd->opcode == MMC_STOP_TRANSMISSION && !host->data) {
2343                 *mask &= ~SDHCI_INT_DATA_END;
2344         }
2345 
2346         if (intmask & SDHCI_INT_RESPONSE)
2347                 sdhci_finish_command(host);
2348 }
2349 
2350 #ifdef CONFIG_MMC_DEBUG
2351 static void sdhci_adma_show_error(struct sdhci_host *host)
2352 {
2353         const char *name = mmc_hostname(host->mmc);
2354         void *desc = host->adma_table;
2355 
2356         sdhci_dumpregs(host);
2357 
2358         while (true) {
2359                 struct sdhci_adma2_64_desc *dma_desc = desc;
2360 
2361                 if (host->flags & SDHCI_USE_64_BIT_DMA)
2362                         DBG("%s: %p: DMA 0x%08x%08x, LEN 0x%04x, Attr=0x%02x\n",
2363                             name, desc, le32_to_cpu(dma_desc->addr_hi),
2364                             le32_to_cpu(dma_desc->addr_lo),
2365                             le16_to_cpu(dma_desc->len),
2366                             le16_to_cpu(dma_desc->cmd));
2367                 else
2368                         DBG("%s: %p: DMA 0x%08x, LEN 0x%04x, Attr=0x%02x\n",
2369                             name, desc, le32_to_cpu(dma_desc->addr_lo),
2370                             le16_to_cpu(dma_desc->len),
2371                             le16_to_cpu(dma_desc->cmd));
2372 
2373                 desc += host->desc_sz;
2374 
2375                 if (dma_desc->cmd & cpu_to_le16(ADMA2_END))
2376                         break;
2377         }
2378 }
2379 #else
2380 static void sdhci_adma_show_error(struct sdhci_host *host) { }
2381 #endif
2382 
2383 static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
2384 {
2385         u32 command;
2386         BUG_ON(intmask == 0);
2387 
2388         /* CMD19 generates _only_ Buffer Read Ready interrupt */
2389         if (intmask & SDHCI_INT_DATA_AVAIL) {
2390                 command = SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND));
2391                 if (command == MMC_SEND_TUNING_BLOCK ||
2392                     command == MMC_SEND_TUNING_BLOCK_HS200) {
2393                         host->tuning_done = 1;
2394                         wake_up(&host->buf_ready_int);
2395                         return;
2396                 }
2397         }
2398 
2399         if (!host->data) {
2400                 /*
2401                  * The "data complete" interrupt is also used to
2402                  * indicate that a busy state has ended. See comment
2403                  * above in sdhci_cmd_irq().
2404                  */
2405                 if (host->cmd && (host->cmd->flags & MMC_RSP_BUSY)) {
2406                         if (intmask & SDHCI_INT_DATA_TIMEOUT) {
2407                                 host->cmd->error = -ETIMEDOUT;
2408                                 tasklet_schedule(&host->finish_tasklet);
2409                                 return;
2410                         }
2411                         if (intmask & SDHCI_INT_DATA_END) {
2412                                 /*
2413                                  * Some cards handle busy-end interrupt
2414                                  * before the command completed, so make
2415                                  * sure we do things in the proper order.
2416                                  */
2417                                 if (host->busy_handle)
2418                                         sdhci_finish_command(host);
2419                                 else
2420                                         host->busy_handle = 1;
2421                                 return;
2422                         }
2423                 }
2424 
2425                 pr_err("%s: Got data interrupt 0x%08x even "
2426                         "though no data operation was in progress.\n",
2427                         mmc_hostname(host->mmc), (unsigned)intmask);
2428                 sdhci_dumpregs(host);
2429 
2430                 return;
2431         }
2432 
2433         if (intmask & SDHCI_INT_DATA_TIMEOUT)
2434                 host->data->error = -ETIMEDOUT;
2435         else if (intmask & SDHCI_INT_DATA_END_BIT)
2436                 host->data->error = -EILSEQ;
2437         else if ((intmask & SDHCI_INT_DATA_CRC) &&
2438                 SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND))
2439                         != MMC_BUS_TEST_R)
2440                 host->data->error = -EILSEQ;
2441         else if (intmask & SDHCI_INT_ADMA_ERROR) {
2442                 pr_err("%s: ADMA error\n", mmc_hostname(host->mmc));
2443                 sdhci_adma_show_error(host);
2444                 host->data->error = -EIO;
2445                 if (host->ops->adma_workaround)
2446                         host->ops->adma_workaround(host, intmask);
2447         }
2448 
2449         if (host->data->error)
2450                 sdhci_finish_data(host);
2451         else {
2452                 if (intmask & (SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL))
2453                         sdhci_transfer_pio(host);
2454 
2455                 /*
2456                  * We currently don't do anything fancy with DMA
2457                  * boundaries, but as we can't disable the feature
2458                  * we need to at least restart the transfer.
2459                  *
2460                  * According to the spec sdhci_readl(host, SDHCI_DMA_ADDRESS)
2461                  * should return a valid address to continue from, but as
2462                  * some controllers are faulty, don't trust them.
2463                  */
2464                 if (intmask & SDHCI_INT_DMA_END) {
2465                         u32 dmastart, dmanow;
2466                         dmastart = sg_dma_address(host->data->sg);
2467                         dmanow = dmastart + host->data->bytes_xfered;
2468                         /*
2469                          * Force update to the next DMA block boundary.
2470                          */
2471                         dmanow = (dmanow &
2472                                 ~(SDHCI_DEFAULT_BOUNDARY_SIZE - 1)) +
2473                                 SDHCI_DEFAULT_BOUNDARY_SIZE;
2474                         host->data->bytes_xfered = dmanow - dmastart;
2475                         DBG("%s: DMA base 0x%08x, transferred 0x%06x bytes,"
2476                                 " next 0x%08x\n",
2477                                 mmc_hostname(host->mmc), dmastart,
2478                                 host->data->bytes_xfered, dmanow);
2479                         sdhci_writel(host, dmanow, SDHCI_DMA_ADDRESS);
2480                 }
2481 
2482                 if (intmask & SDHCI_INT_DATA_END) {
2483                         if (host->cmd) {
2484                                 /*
2485                                  * Data managed to finish before the
2486                                  * command completed. Make sure we do
2487                                  * things in the proper order.
2488                                  */
2489                                 host->data_early = 1;
2490                         } else {
2491                                 sdhci_finish_data(host);
2492                         }
2493                 }
2494         }
2495 }
2496 
2497 static irqreturn_t sdhci_irq(int irq, void *dev_id)
2498 {
2499         irqreturn_t result = IRQ_NONE;
2500         struct sdhci_host *host = dev_id;
2501         u32 intmask, mask, unexpected = 0;
2502         int max_loops = 16;
2503 
2504         spin_lock(&host->lock);
2505 
2506         if (host->runtime_suspended && !sdhci_sdio_irq_enabled(host)) {
2507                 spin_unlock(&host->lock);
2508                 return IRQ_NONE;
2509         }
2510 
2511         intmask = sdhci_readl(host, SDHCI_INT_STATUS);
2512         if (!intmask || intmask == 0xffffffff) {
2513                 result = IRQ_NONE;
2514                 goto out;
2515         }
2516 
2517         do {
2518                 /* Clear selected interrupts. */
2519                 mask = intmask & (SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK |
2520                                   SDHCI_INT_BUS_POWER);
2521                 sdhci_writel(host, mask, SDHCI_INT_STATUS);
2522 
2523                 DBG("*** %s got interrupt: 0x%08x\n",
2524                         mmc_hostname(host->mmc), intmask);
2525 
2526                 if (intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
2527                         u32 present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
2528                                       SDHCI_CARD_PRESENT;
2529 
2530                         /*
2531                          * There is a observation on i.mx esdhc.  INSERT
2532                          * bit will be immediately set again when it gets
2533                          * cleared, if a card is inserted.  We have to mask
2534                          * the irq to prevent interrupt storm which will
2535                          * freeze the system.  And the REMOVE gets the
2536                          * same situation.
2537                          *
2538                          * More testing are needed here to ensure it works
2539                          * for other platforms though.
2540                          */
2541                         host->ier &= ~(SDHCI_INT_CARD_INSERT |
2542                                        SDHCI_INT_CARD_REMOVE);
2543                         host->ier |= present ? SDHCI_INT_CARD_REMOVE :
2544                                                SDHCI_INT_CARD_INSERT;
2545                         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
2546                         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
2547 
2548                         sdhci_writel(host, intmask & (SDHCI_INT_CARD_INSERT |
2549                                      SDHCI_INT_CARD_REMOVE), SDHCI_INT_STATUS);
2550 
2551                         host->thread_isr |= intmask & (SDHCI_INT_CARD_INSERT |
2552                                                        SDHCI_INT_CARD_REMOVE);
2553                         result = IRQ_WAKE_THREAD;
2554                 }
2555 
2556                 if (intmask & SDHCI_INT_CMD_MASK)
2557                         sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK,
2558                                       &intmask);
2559 
2560                 if (intmask & SDHCI_INT_DATA_MASK)
2561                         sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK);
2562 
2563                 if (intmask & SDHCI_INT_BUS_POWER)
2564                         pr_err("%s: Card is consuming too much power!\n",
2565                                 mmc_hostname(host->mmc));
2566 
2567                 if (intmask & SDHCI_INT_CARD_INT) {
2568                         sdhci_enable_sdio_irq_nolock(host, false);
2569                         host->thread_isr |= SDHCI_INT_CARD_INT;
2570                         result = IRQ_WAKE_THREAD;
2571                 }
2572 
2573                 intmask &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE |
2574                              SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK |
2575                              SDHCI_INT_ERROR | SDHCI_INT_BUS_POWER |
2576                              SDHCI_INT_CARD_INT);
2577 
2578                 if (intmask) {
2579                         unexpected |= intmask;
2580                         sdhci_writel(host, intmask, SDHCI_INT_STATUS);
2581                 }
2582 
2583                 if (result == IRQ_NONE)
2584                         result = IRQ_HANDLED;
2585 
2586                 intmask = sdhci_readl(host, SDHCI_INT_STATUS);
2587         } while (intmask && --max_loops);
2588 out:
2589         spin_unlock(&host->lock);
2590 
2591         if (unexpected) {
2592                 pr_err("%s: Unexpected interrupt 0x%08x.\n",
2593                            mmc_hostname(host->mmc), unexpected);
2594                 sdhci_dumpregs(host);
2595         }
2596 
2597         return result;
2598 }
2599 
2600 static irqreturn_t sdhci_thread_irq(int irq, void *dev_id)
2601 {
2602         struct sdhci_host *host = dev_id;
2603         unsigned long flags;
2604         u32 isr;
2605 
2606         spin_lock_irqsave(&host->lock, flags);
2607         isr = host->thread_isr;
2608         host->thread_isr = 0;
2609         spin_unlock_irqrestore(&host->lock, flags);
2610 
2611         if (isr & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
2612                 sdhci_card_event(host->mmc);
2613                 mmc_detect_change(host->mmc, msecs_to_jiffies(200));
2614         }
2615 
2616         if (isr & SDHCI_INT_CARD_INT) {
2617                 sdio_run_irqs(host->mmc);
2618 
2619                 spin_lock_irqsave(&host->lock, flags);
2620                 if (host->flags & SDHCI_SDIO_IRQ_ENABLED)
2621                         sdhci_enable_sdio_irq_nolock(host, true);
2622                 spin_unlock_irqrestore(&host->lock, flags);
2623         }
2624 
2625         return isr ? IRQ_HANDLED : IRQ_NONE;
2626 }
2627 
2628 /*****************************************************************************\
2629  *                                                                           *
2630  * Suspend/resume                                                            *
2631  *                                                                           *
2632 \*****************************************************************************/
2633 
2634 #ifdef CONFIG_PM
2635 void sdhci_enable_irq_wakeups(struct sdhci_host *host)
2636 {
2637         u8 val;
2638         u8 mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE
2639                         | SDHCI_WAKE_ON_INT;
2640 
2641         val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
2642         val |= mask ;
2643         /* Avoid fake wake up */
2644         if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
2645                 val &= ~(SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE);
2646         sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
2647 }
2648 EXPORT_SYMBOL_GPL(sdhci_enable_irq_wakeups);
2649 
2650 static void sdhci_disable_irq_wakeups(struct sdhci_host *host)
2651 {
2652         u8 val;
2653         u8 mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE
2654                         | SDHCI_WAKE_ON_INT;
2655 
2656         val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
2657         val &= ~mask;
2658         sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
2659 }
2660 
2661 int sdhci_suspend_host(struct sdhci_host *host)
2662 {
2663         sdhci_disable_card_detection(host);
2664 
2665         /* Disable tuning since we are suspending */
2666         if (host->flags & SDHCI_USING_RETUNING_TIMER) {
2667                 del_timer_sync(&host->tuning_timer);
2668                 host->flags &= ~SDHCI_NEEDS_RETUNING;
2669         }
2670 
2671         if (!device_may_wakeup(mmc_dev(host->mmc))) {
2672                 host->ier = 0;
2673                 sdhci_writel(host, 0, SDHCI_INT_ENABLE);
2674                 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
2675                 free_irq(host->irq, host);
2676         } else {
2677                 sdhci_enable_irq_wakeups(host);
2678                 enable_irq_wake(host->irq);
2679         }
2680         return 0;
2681 }
2682 
2683 EXPORT_SYMBOL_GPL(sdhci_suspend_host);
2684 
2685 int sdhci_resume_host(struct sdhci_host *host)
2686 {
2687         int ret = 0;
2688 
2689         if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
2690                 if (host->ops->enable_dma)
2691                         host->ops->enable_dma(host);
2692         }
2693 
2694         if (!device_may_wakeup(mmc_dev(host->mmc))) {
2695                 ret = request_threaded_irq(host->irq, sdhci_irq,
2696                                            sdhci_thread_irq, IRQF_SHARED,
2697                                            mmc_hostname(host->mmc), host);
2698                 if (ret)
2699                         return ret;
2700         } else {
2701                 sdhci_disable_irq_wakeups(host);
2702                 disable_irq_wake(host->irq);
2703         }
2704 
2705         if ((host->mmc->pm_flags & MMC_PM_KEEP_POWER) &&
2706             (host->quirks2 & SDHCI_QUIRK2_HOST_OFF_CARD_ON)) {
2707                 /* Card keeps power but host controller does not */
2708                 sdhci_init(host, 0);
2709                 host->pwr = 0;
2710                 host->clock = 0;
2711                 sdhci_do_set_ios(host, &host->mmc->ios);
2712         } else {
2713                 sdhci_init(host, (host->mmc->pm_flags & MMC_PM_KEEP_POWER));
2714                 mmiowb();
2715         }
2716 
2717         sdhci_enable_card_detection(host);
2718 
2719         /* Set the re-tuning expiration flag */
2720         if (host->flags & SDHCI_USING_RETUNING_TIMER)
2721                 host->flags |= SDHCI_NEEDS_RETUNING;
2722 
2723         return ret;
2724 }
2725 
2726 EXPORT_SYMBOL_GPL(sdhci_resume_host);
2727 
2728 static int sdhci_runtime_pm_get(struct sdhci_host *host)
2729 {
2730         return pm_runtime_get_sync(host->mmc->parent);
2731 }
2732 
2733 static int sdhci_runtime_pm_put(struct sdhci_host *host)
2734 {
2735         pm_runtime_mark_last_busy(host->mmc->parent);
2736         return pm_runtime_put_autosuspend(host->mmc->parent);
2737 }
2738 
2739 static void sdhci_runtime_pm_bus_on(struct sdhci_host *host)
2740 {
2741         if (host->runtime_suspended || host->bus_on)
2742                 return;
2743         host->bus_on = true;
2744         pm_runtime_get_noresume(host->mmc->parent);
2745 }
2746 
2747 static void sdhci_runtime_pm_bus_off(struct sdhci_host *host)
2748 {
2749         if (host->runtime_suspended || !host->bus_on)
2750                 return;
2751         host->bus_on = false;
2752         pm_runtime_put_noidle(host->mmc->parent);
2753 }
2754 
2755 int sdhci_runtime_suspend_host(struct sdhci_host *host)
2756 {
2757         unsigned long flags;
2758 
2759         /* Disable tuning since we are suspending */
2760         if (host->flags & SDHCI_USING_RETUNING_TIMER) {
2761                 del_timer_sync(&host->tuning_timer);
2762                 host->flags &= ~SDHCI_NEEDS_RETUNING;
2763         }
2764 
2765         spin_lock_irqsave(&host->lock, flags);
2766         host->ier &= SDHCI_INT_CARD_INT;
2767         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
2768         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
2769         spin_unlock_irqrestore(&host->lock, flags);
2770 
2771         synchronize_hardirq(host->irq);
2772 
2773         spin_lock_irqsave(&host->lock, flags);
2774         host->runtime_suspended = true;
2775         spin_unlock_irqrestore(&host->lock, flags);
2776 
2777         return 0;
2778 }
2779 EXPORT_SYMBOL_GPL(sdhci_runtime_suspend_host);
2780 
2781 int sdhci_runtime_resume_host(struct sdhci_host *host)
2782 {
2783         unsigned long flags;
2784         int host_flags = host->flags;
2785 
2786         if (host_flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
2787                 if (host->ops->enable_dma)
2788                         host->ops->enable_dma(host);
2789         }
2790 
2791         sdhci_init(host, 0);
2792 
2793         /* Force clock and power re-program */
2794         host->pwr = 0;
2795         host->clock = 0;
2796         sdhci_do_set_ios(host, &host->mmc->ios);
2797 
2798         sdhci_do_start_signal_voltage_switch(host, &host->mmc->ios);
2799         if ((host_flags & SDHCI_PV_ENABLED) &&
2800                 !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN)) {
2801                 spin_lock_irqsave(&host->lock, flags);
2802                 sdhci_enable_preset_value(host, true);
2803                 spin_unlock_irqrestore(&host->lock, flags);
2804         }
2805 
2806         /* Set the re-tuning expiration flag */
2807         if (host->flags & SDHCI_USING_RETUNING_TIMER)
2808                 host->flags |= SDHCI_NEEDS_RETUNING;
2809 
2810         spin_lock_irqsave(&host->lock, flags);
2811 
2812         host->runtime_suspended = false;
2813 
2814         /* Enable SDIO IRQ */
2815         if (host->flags & SDHCI_SDIO_IRQ_ENABLED)
2816                 sdhci_enable_sdio_irq_nolock(host, true);
2817 
2818         /* Enable Card Detection */
2819         sdhci_enable_card_detection(host);
2820 
2821         spin_unlock_irqrestore(&host->lock, flags);
2822 
2823         return 0;
2824 }
2825 EXPORT_SYMBOL_GPL(sdhci_runtime_resume_host);
2826 
2827 #endif /* CONFIG_PM */
2828 
2829 /*****************************************************************************\
2830  *                                                                           *
2831  * Device allocation/registration                                            *
2832  *                                                                           *
2833 \*****************************************************************************/
2834 
2835 struct sdhci_host *sdhci_alloc_host(struct device *dev,
2836         size_t priv_size)
2837 {
2838         struct mmc_host *mmc;
2839         struct sdhci_host *host;
2840 
2841         WARN_ON(dev == NULL);
2842 
2843         mmc = mmc_alloc_host(sizeof(struct sdhci_host) + priv_size, dev);
2844         if (!mmc)
2845                 return ERR_PTR(-ENOMEM);
2846 
2847         host = mmc_priv(mmc);
2848         host->mmc = mmc;
2849 
2850         return host;
2851 }
2852 
2853 EXPORT_SYMBOL_GPL(sdhci_alloc_host);
2854 
2855 int sdhci_add_host(struct sdhci_host *host)
2856 {
2857         struct mmc_host *mmc;
2858         u32 caps[2] = {0, 0};
2859         u32 max_current_caps;
2860         unsigned int ocr_avail;
2861         unsigned int override_timeout_clk;
2862         int ret;
2863 
2864         WARN_ON(host == NULL);
2865         if (host == NULL)
2866                 return -EINVAL;
2867 
2868         mmc = host->mmc;
2869 
2870         if (debug_quirks)
2871                 host->quirks = debug_quirks;
2872         if (debug_quirks2)
2873                 host->quirks2 = debug_quirks2;
2874 
2875         override_timeout_clk = host->timeout_clk;
2876 
2877         sdhci_do_reset(host, SDHCI_RESET_ALL);
2878 
2879         host->version = sdhci_readw(host, SDHCI_HOST_VERSION);
2880         host->version = (host->version & SDHCI_SPEC_VER_MASK)
2881                                 >> SDHCI_SPEC_VER_SHIFT;
2882         if (host->version > SDHCI_SPEC_300) {
2883                 pr_err("%s: Unknown controller version (%d). "
2884                         "You may experience problems.\n", mmc_hostname(mmc),
2885                         host->version);
2886         }
2887 
2888         caps[0] = (host->quirks & SDHCI_QUIRK_MISSING_CAPS) ? host->caps :
2889                 sdhci_readl(host, SDHCI_CAPABILITIES);
2890 
2891         if (host->version >= SDHCI_SPEC_300)
2892                 caps[1] = (host->quirks & SDHCI_QUIRK_MISSING_CAPS) ?
2893                         host->caps1 :
2894                         sdhci_readl(host, SDHCI_CAPABILITIES_1);
2895 
2896         if (host->quirks & SDHCI_QUIRK_FORCE_DMA)
2897                 host->flags |= SDHCI_USE_SDMA;
2898         else if (!(caps[0] & SDHCI_CAN_DO_SDMA))
2899                 DBG("Controller doesn't have SDMA capability\n");
2900         else
2901                 host->flags |= SDHCI_USE_SDMA;
2902 
2903         if ((host->quirks & SDHCI_QUIRK_BROKEN_DMA) &&
2904                 (host->flags & SDHCI_USE_SDMA)) {
2905                 DBG("Disabling DMA as it is marked broken\n");
2906                 host->flags &= ~SDHCI_USE_SDMA;
2907         }
2908 
2909         if ((host->version >= SDHCI_SPEC_200) &&
2910                 (caps[0] & SDHCI_CAN_DO_ADMA2))
2911                 host->flags |= SDHCI_USE_ADMA;
2912 
2913         if ((host->quirks & SDHCI_QUIRK_BROKEN_ADMA) &&
2914                 (host->flags & SDHCI_USE_ADMA)) {
2915                 DBG("Disabling ADMA as it is marked broken\n");
2916                 host->flags &= ~SDHCI_USE_ADMA;
2917         }
2918 
2919         /*
2920          * It is assumed that a 64-bit capable device has set a 64-bit DMA mask
2921          * and *must* do 64-bit DMA.  A driver has the opportunity to change
2922          * that during the first call to ->enable_dma().  Similarly
2923          * SDHCI_QUIRK2_BROKEN_64_BIT_DMA must be left to the drivers to
2924          * implement.
2925          */
2926         if (sdhci_readl(host, SDHCI_CAPABILITIES) & SDHCI_CAN_64BIT)
2927                 host->flags |= SDHCI_USE_64_BIT_DMA;
2928 
2929         if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
2930                 if (host->ops->enable_dma) {
2931                         if (host->ops->enable_dma(host)) {
2932                                 pr_warn("%s: No suitable DMA available - falling back to PIO\n",
2933                                         mmc_hostname(mmc));
2934                                 host->flags &=
2935                                         ~(SDHCI_USE_SDMA | SDHCI_USE_ADMA);
2936                         }
2937                 }
2938         }
2939 
2940         /* SDMA does not support 64-bit DMA */
2941         if (host->flags & SDHCI_USE_64_BIT_DMA)
2942                 host->flags &= ~SDHCI_USE_SDMA;
2943 
2944         if (host->flags & SDHCI_USE_ADMA) {
2945                 /*
2946                  * The DMA descriptor table size is calculated as the maximum
2947                  * number of segments times 2, to allow for an alignment
2948                  * descriptor for each segment, plus 1 for a nop end descriptor,
2949                  * all multipled by the descriptor size.
2950                  */
2951                 if (host->flags & SDHCI_USE_64_BIT_DMA) {
2952                         host->adma_table_sz = (SDHCI_MAX_SEGS * 2 + 1) *
2953                                               SDHCI_ADMA2_64_DESC_SZ;
2954                         host->align_buffer_sz = SDHCI_MAX_SEGS *
2955                                                 SDHCI_ADMA2_64_ALIGN;
2956                         host->desc_sz = SDHCI_ADMA2_64_DESC_SZ;
2957                         host->align_sz = SDHCI_ADMA2_64_ALIGN;
2958                         host->align_mask = SDHCI_ADMA2_64_ALIGN - 1;
2959                 } else {
2960                         host->adma_table_sz = (SDHCI_MAX_SEGS * 2 + 1) *
2961                                               SDHCI_ADMA2_32_DESC_SZ;
2962                         host->align_buffer_sz = SDHCI_MAX_SEGS *
2963                                                 SDHCI_ADMA2_32_ALIGN;
2964                         host->desc_sz = SDHCI_ADMA2_32_DESC_SZ;
2965                         host->align_sz = SDHCI_ADMA2_32_ALIGN;
2966                         host->align_mask = SDHCI_ADMA2_32_ALIGN - 1;
2967                 }
2968                 host->adma_table = dma_alloc_coherent(mmc_dev(mmc),
2969                                                       host->adma_table_sz,
2970                                                       &host->adma_addr,
2971                                                       GFP_KERNEL);
2972                 host->align_buffer = kmalloc(host->align_buffer_sz, GFP_KERNEL);
2973                 if (!host->adma_table || !host->align_buffer) {
2974                         dma_free_coherent(mmc_dev(mmc), host->adma_table_sz,
2975                                           host->adma_table, host->adma_addr);
2976                         kfree(host->align_buffer);
2977                         pr_warn("%s: Unable to allocate ADMA buffers - falling back to standard DMA\n",
2978                                 mmc_hostname(mmc));
2979                         host->flags &= ~SDHCI_USE_ADMA;
2980                         host->adma_table = NULL;
2981                         host->align_buffer = NULL;
2982                 } else if (host->adma_addr & host->align_mask) {
2983                         pr_warn("%s: unable to allocate aligned ADMA descriptor\n",
2984                                 mmc_hostname(mmc));
2985                         host->flags &= ~SDHCI_USE_ADMA;
2986                         dma_free_coherent(mmc_dev(mmc), host->adma_table_sz,
2987                                           host->adma_table, host->adma_addr);
2988                         kfree(host->align_buffer);
2989                         host->adma_table = NULL;
2990                         host->align_buffer = NULL;
2991                 }
2992         }
2993 
2994         /*
2995          * If we use DMA, then it's up to the caller to set the DMA
2996          * mask, but PIO does not need the hw shim so we set a new
2997          * mask here in that case.
2998          */
2999         if (!(host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA))) {
3000                 host->dma_mask = DMA_BIT_MASK(64);
3001                 mmc_dev(mmc)->dma_mask = &host->dma_mask;
3002         }
3003 
3004         if (host->version >= SDHCI_SPEC_300)
3005                 host->max_clk = (caps[0] & SDHCI_CLOCK_V3_BASE_MASK)
3006                         >> SDHCI_CLOCK_BASE_SHIFT;
3007         else
3008                 host->max_clk = (caps[0] & SDHCI_CLOCK_BASE_MASK)
3009                         >> SDHCI_CLOCK_BASE_SHIFT;
3010 
3011         host->max_clk *= 1000000;
3012         if (host->max_clk == 0 || host->quirks &
3013                         SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN) {
3014                 if (!host->ops->get_max_clock) {
3015                         pr_err("%s: Hardware doesn't specify base clock "
3016                                "frequency.\n", mmc_hostname(mmc));
3017                         return -ENODEV;
3018                 }
3019                 host->max_clk = host->ops->get_max_clock(host);
3020         }
3021 
3022         /*
3023          * In case of Host Controller v3.00, find out whether clock
3024          * multiplier is supported.
3025          */
3026         host->clk_mul = (caps[1] & SDHCI_CLOCK_MUL_MASK) >>
3027                         SDHCI_CLOCK_MUL_SHIFT;
3028 
3029         /*
3030          * In case the value in Clock Multiplier is 0, then programmable
3031          * clock mode is not supported, otherwise the actual clock
3032          * multiplier is one more than the value of Clock Multiplier
3033          * in the Capabilities Register.
3034          */
3035         if (host->clk_mul)
3036                 host->clk_mul += 1;
3037 
3038         /*
3039          * Set host parameters.
3040          */
3041         mmc->ops = &sdhci_ops;
3042         mmc->f_max = host->max_clk;
3043         if (host->ops->get_min_clock)
3044                 mmc->f_min = host->ops->get_min_clock(host);
3045         else if (host->version >= SDHCI_SPEC_300) {
3046                 if (host->clk_mul) {
3047                         mmc->f_min = (host->max_clk * host->clk_mul) / 1024;
3048                         mmc->f_max = host->max_clk * host->clk_mul;
3049                 } else
3050                         mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_300;
3051         } else
3052                 mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_200;
3053 
3054         if (!(host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK)) {
3055                 host->timeout_clk = (caps[0] & SDHCI_TIMEOUT_CLK_MASK) >>
3056                                         SDHCI_TIMEOUT_CLK_SHIFT;
3057                 if (host->timeout_clk == 0) {
3058                         if (host->ops->get_timeout_clock) {
3059                                 host->timeout_clk =
3060                                         host->ops->get_timeout_clock(host);
3061                         } else {
3062                                 pr_err("%s: Hardware doesn't specify timeout clock frequency.\n",
3063                                         mmc_hostname(mmc));
3064                                 return -ENODEV;
3065                         }
3066                 }
3067 
3068                 if (caps[0] & SDHCI_TIMEOUT_CLK_UNIT)
3069                         host->timeout_clk *= 1000;
3070 
3071                 mmc->max_busy_timeout = host->ops->get_max_timeout_count ?
3072                         host->ops->get_max_timeout_count(host) : 1 << 27;
3073                 mmc->max_busy_timeout /= host->timeout_clk;
3074         }
3075 
3076         if (override_timeout_clk)
3077                 host->timeout_clk = override_timeout_clk;
3078 
3079         mmc->caps |= MMC_CAP_SDIO_IRQ | MMC_CAP_ERASE | MMC_CAP_CMD23;
3080         mmc->caps2 |= MMC_CAP2_SDIO_IRQ_NOTHREAD;
3081 
3082         if (host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12)
3083                 host->flags |= SDHCI_AUTO_CMD12;
3084 
3085         /* Auto-CMD23 stuff only works in ADMA or PIO. */
3086         if ((host->version >= SDHCI_SPEC_300) &&
3087             ((host->flags & SDHCI_USE_ADMA) ||
3088              !(host->flags & SDHCI_USE_SDMA))) {
3089                 host->flags |= SDHCI_AUTO_CMD23;
3090                 DBG("%s: Auto-CMD23 available\n", mmc_hostname(mmc));
3091         } else {
3092                 DBG("%s: Auto-CMD23 unavailable\n", mmc_hostname(mmc));
3093         }
3094 
3095         /*
3096          * A controller may support 8-bit width, but the board itself
3097          * might not have the pins brought out.  Boards that support
3098          * 8-bit width must set "mmc->caps |= MMC_CAP_8_BIT_DATA;" in
3099          * their platform code before calling sdhci_add_host(), and we
3100          * won't assume 8-bit width for hosts without that CAP.
3101          */
3102         if (!(host->quirks & SDHCI_QUIRK_FORCE_1_BIT_DATA))
3103                 mmc->caps |= MMC_CAP_4_BIT_DATA;
3104 
3105         if (host->quirks2 & SDHCI_QUIRK2_HOST_NO_CMD23)
3106                 mmc->caps &= ~MMC_CAP_CMD23;
3107 
3108         if (caps[0] & SDHCI_CAN_DO_HISPD)
3109                 mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
3110 
3111         if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) &&
3112             !(mmc->caps & MMC_CAP_NONREMOVABLE))
3113                 mmc->caps |= MMC_CAP_NEEDS_POLL;
3114 
3115         /* If there are external regulators, get them */
3116         if (mmc_regulator_get_supply(mmc) == -EPROBE_DEFER)
3117                 return -EPROBE_DEFER;
3118 
3119         /* If vqmmc regulator and no 1.8V signalling, then there's no UHS */
3120         if (!IS_ERR(mmc->supply.vqmmc)) {
3121                 ret = regulator_enable(mmc->supply.vqmmc);
3122                 if (!regulator_is_supported_voltage(mmc->supply.vqmmc, 1700000,
3123                                                     1950000))
3124                         caps[1] &= ~(SDHCI_SUPPORT_SDR104 |
3125                                         SDHCI_SUPPORT_SDR50 |
3126                                         SDHCI_SUPPORT_DDR50);
3127                 if (ret) {
3128                         pr_warn("%s: Failed to enable vqmmc regulator: %d\n",
3129                                 mmc_hostname(mmc), ret);
3130                         mmc->supply.vqmmc = ERR_PTR(-EINVAL);
3131                 }
3132         }
3133 
3134         if (host->quirks2 & SDHCI_QUIRK2_NO_1_8_V)
3135                 caps[1] &= ~(SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 |
3136                        SDHCI_SUPPORT_DDR50);
3137 
3138         /* Any UHS-I mode in caps implies SDR12 and SDR25 support. */
3139         if (caps[1] & (SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 |
3140                        SDHCI_SUPPORT_DDR50))
3141                 mmc->caps |= MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25;
3142 
3143         /* SDR104 supports also implies SDR50 support */
3144         if (caps[1] & SDHCI_SUPPORT_SDR104) {
3145                 mmc->caps |= MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_SDR50;
3146                 /* SD3.0: SDR104 is supported so (for eMMC) the caps2
3147                  * field can be promoted to support HS200.
3148                  */
3149                 if (!(host->quirks2 & SDHCI_QUIRK2_BROKEN_HS200))
3150                         mmc->caps2 |= MMC_CAP2_HS200;
3151         } else if (caps[1] & SDHCI_SUPPORT_SDR50)
3152                 mmc->caps |= MMC_CAP_UHS_SDR50;
3153 
3154         if (host->quirks2 & SDHCI_QUIRK2_CAPS_BIT63_FOR_HS400 &&
3155             (caps[1] & SDHCI_SUPPORT_HS400))
3156                 mmc->caps2 |= MMC_CAP2_HS400;
3157 
3158         if ((mmc->caps2 & MMC_CAP2_HSX00_1_2V) &&
3159             (IS_ERR(mmc->supply.vqmmc) ||
3160              !regulator_is_supported_voltage(mmc->supply.vqmmc, 1100000,
3161                                              1300000)))
3162                 mmc->caps2 &= ~MMC_CAP2_HSX00_1_2V;
3163 
3164         if ((caps[1] & SDHCI_SUPPORT_DDR50) &&
3165                 !(host->quirks2 & SDHCI_QUIRK2_BROKEN_DDR50))
3166                 mmc->caps |= MMC_CAP_UHS_DDR50;
3167 
3168         /* Does the host need tuning for SDR50? */
3169         if (caps[1] & SDHCI_USE_SDR50_TUNING)
3170                 host->flags |= SDHCI_SDR50_NEEDS_TUNING;
3171 
3172         /* Does the host need tuning for SDR104 / HS200? */
3173         if (mmc->caps2 & MMC_CAP2_HS200)
3174                 host->flags |= SDHCI_SDR104_NEEDS_TUNING;
3175 
3176         /* Driver Type(s) (A, C, D) supported by the host */
3177         if (caps[1] & SDHCI_DRIVER_TYPE_A)
3178                 mmc->caps |= MMC_CAP_DRIVER_TYPE_A;
3179         if (caps[1] & SDHCI_DRIVER_TYPE_C)
3180                 mmc->caps |= MMC_CAP_DRIVER_TYPE_C;
3181         if (caps[1] & SDHCI_DRIVER_TYPE_D)
3182                 mmc->caps |= MMC_CAP_DRIVER_TYPE_D;
3183 
3184         /* Initial value for re-tuning timer count */
3185         host->tuning_count = (caps[1] & SDHCI_RETUNING_TIMER_COUNT_MASK) >>
3186                               SDHCI_RETUNING_TIMER_COUNT_SHIFT;
3187 
3188         /*
3189          * In case Re-tuning Timer is not disabled, the actual value of
3190          * re-tuning timer will be 2 ^ (n - 1).
3191          */
3192         if (host->tuning_count)
3193                 host->tuning_count = 1 << (host->tuning_count - 1);
3194 
3195         /* Re-tuning mode supported by the Host Controller */
3196         host->tuning_mode = (caps[1] & SDHCI_RETUNING_MODE_MASK) >>
3197                              SDHCI_RETUNING_MODE_SHIFT;
3198 
3199         ocr_avail = 0;
3200 
3201         /*
3202          * According to SD Host Controller spec v3.00, if the Host System
3203          * can afford more than 150mA, Host Driver should set XPC to 1. Also
3204          * the value is meaningful only if Voltage Support in the Capabilities
3205          * register is set. The actual current value is 4 times the register
3206          * value.
3207          */
3208         max_current_caps = sdhci_readl(host, SDHCI_MAX_CURRENT);
3209         if (!max_current_caps && !IS_ERR(mmc->supply.vmmc)) {
3210                 int curr = regulator_get_current_limit(mmc->supply.vmmc);
3211                 if (curr > 0) {
3212 
3213                         /* convert to SDHCI_MAX_CURRENT format */
3214                         curr = curr/1000;  /* convert to mA */
3215                         curr = curr/SDHCI_MAX_CURRENT_MULTIPLIER;
3216 
3217                         curr = min_t(u32, curr, SDHCI_MAX_CURRENT_LIMIT);
3218                         max_current_caps =
3219                                 (curr << SDHCI_MAX_CURRENT_330_SHIFT) |
3220                                 (curr << SDHCI_MAX_CURRENT_300_SHIFT) |
3221                                 (curr << SDHCI_MAX_CURRENT_180_SHIFT);
3222                 }
3223         }
3224 
3225         if (caps[0] & SDHCI_CAN_VDD_330) {
3226                 ocr_avail |= MMC_VDD_32_33 | MMC_VDD_33_34;
3227 
3228                 mmc->max_current_330 = ((max_current_caps &
3229                                    SDHCI_MAX_CURRENT_330_MASK) >>
3230                                    SDHCI_MAX_CURRENT_330_SHIFT) *
3231                                    SDHCI_MAX_CURRENT_MULTIPLIER;
3232         }
3233         if (caps[0] & SDHCI_CAN_VDD_300) {
3234                 ocr_avail |= MMC_VDD_29_30 | MMC_VDD_30_31;
3235 
3236                 mmc->max_current_300 = ((max_current_caps &
3237                                    SDHCI_MAX_CURRENT_300_MASK) >>
3238                                    SDHCI_MAX_CURRENT_300_SHIFT) *
3239                                    SDHCI_MAX_CURRENT_MULTIPLIER;
3240         }
3241         if (caps[0] & SDHCI_CAN_VDD_180) {
3242                 ocr_avail |= MMC_VDD_165_195;
3243 
3244                 mmc->max_current_180 = ((max_current_caps &
3245                                    SDHCI_MAX_CURRENT_180_MASK) >>
3246                                    SDHCI_MAX_CURRENT_180_SHIFT) *
3247                                    SDHCI_MAX_CURRENT_MULTIPLIER;
3248         }
3249 
3250         /* If OCR set by external regulators, use it instead */
3251         if (mmc->ocr_avail)
3252                 ocr_avail = mmc->ocr_avail;
3253 
3254         if (host->ocr_mask)
3255                 ocr_avail &= host->ocr_mask;
3256 
3257         mmc->ocr_avail = ocr_avail;
3258         mmc->ocr_avail_sdio = ocr_avail;
3259         if (host->ocr_avail_sdio)
3260                 mmc->ocr_avail_sdio &= host->ocr_avail_sdio;
3261         mmc->ocr_avail_sd = ocr_avail;
3262         if (host->ocr_avail_sd)
3263                 mmc->ocr_avail_sd &= host->ocr_avail_sd;
3264         else /* normal SD controllers don't support 1.8V */
3265                 mmc->ocr_avail_sd &= ~MMC_VDD_165_195;
3266         mmc->ocr_avail_mmc = ocr_avail;
3267         if (host->ocr_avail_mmc)
3268                 mmc->ocr_avail_mmc &= host->ocr_avail_mmc;
3269 
3270         if (mmc->ocr_avail == 0) {
3271                 pr_err("%s: Hardware doesn't report any "
3272                         "support voltages.\n", mmc_hostname(mmc));
3273                 return -ENODEV;
3274         }
3275 
3276         spin_lock_init(&host->lock);
3277 
3278         /*
3279          * Maximum number of segments. Depends on if the hardware
3280          * can do scatter/gather or not.
3281          */
3282         if (host->flags & SDHCI_USE_ADMA)
3283                 mmc->max_segs = SDHCI_MAX_SEGS;
3284         else if (host->flags & SDHCI_USE_SDMA)
3285                 mmc->max_segs = 1;
3286         else /* PIO */
3287                 mmc->max_segs = SDHCI_MAX_SEGS;
3288 
3289         /*
3290          * Maximum number of sectors in one transfer. Limited by SDMA boundary
3291          * size (512KiB). Note some tuning modes impose a 4MiB limit, but this
3292          * is less anyway.
3293          */
3294         mmc->max_req_size = 524288;
3295 
3296         /*
3297          * Maximum segment size. Could be one segment with the maximum number
3298          * of bytes. When doing hardware scatter/gather, each entry cannot
3299          * be larger than 64 KiB though.
3300          */
3301         if (host->flags & SDHCI_USE_ADMA) {
3302                 if (host->quirks & SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC)
3303                         mmc->max_seg_size = 65535;
3304                 else
3305                         mmc->max_seg_size = 65536;
3306         } else {
3307                 mmc->max_seg_size = mmc->max_req_size;
3308         }
3309 
3310         /*
3311          * Maximum block size. This varies from controller to controller and
3312          * is specified in the capabilities register.
3313          */
3314         if (host->quirks & SDHCI_QUIRK_FORCE_BLK_SZ_2048) {
3315                 mmc->max_blk_size = 2;
3316         } else {
3317                 mmc->max_blk_size = (caps[0] & SDHCI_MAX_BLOCK_MASK) >>
3318                                 SDHCI_MAX_BLOCK_SHIFT;
3319                 if (mmc->max_blk_size >= 3) {
3320                         pr_warn("%s: Invalid maximum block size, assuming 512 bytes\n",
3321                                 mmc_hostname(mmc));
3322                         mmc->max_blk_size = 0;
3323                 }
3324         }
3325 
3326         mmc->max_blk_size = 512 << mmc->max_blk_size;
3327 
3328         /*
3329          * Maximum block count.
3330          */
3331         mmc->max_blk_count = (host->quirks & SDHCI_QUIRK_NO_MULTIBLOCK) ? 1 : 65535;
3332 
3333         /*
3334          * Init tasklets.
3335          */
3336         tasklet_init(&host->finish_tasklet,
3337                 sdhci_tasklet_finish, (unsigned long)host);
3338 
3339         setup_timer(&host->timer, sdhci_timeout_timer, (unsigned long)host);
3340 
3341         if (host->version >= SDHCI_SPEC_300) {
3342                 init_waitqueue_head(&host->buf_ready_int);
3343 
3344                 /* Initialize re-tuning timer */
3345                 init_timer(&host->tuning_timer);
3346                 host->tuning_timer.data = (unsigned long)host;
3347                 host->tuning_timer.function = sdhci_tuning_timer;
3348         }
3349 
3350         sdhci_init(host, 0);
3351 
3352         ret = request_threaded_irq(host->irq, sdhci_irq, sdhci_thread_irq,
3353                                    IRQF_SHARED, mmc_hostname(mmc), host);
3354         if (ret) {
3355                 pr_err("%s: Failed to request IRQ %d: %d\n",
3356                        mmc_hostname(mmc), host->irq, ret);
3357                 goto untasklet;
3358         }
3359 
3360 #ifdef CONFIG_MMC_DEBUG
3361         sdhci_dumpregs(host);
3362 #endif
3363 
3364 #ifdef SDHCI_USE_LEDS_CLASS
3365         snprintf(host->led_name, sizeof(host->led_name),
3366                 "%s::", mmc_hostname(mmc));
3367         host->led.name = host->led_name;
3368         host->led.brightness = LED_OFF;
3369         host->led.default_trigger = mmc_hostname(mmc);
3370         host->led.brightness_set = sdhci_led_control;
3371 
3372         ret = led_classdev_register(mmc_dev(mmc), &host->led);
3373         if (ret) {
3374                 pr_err("%s: Failed to register LED device: %d\n",
3375                        mmc_hostname(mmc), ret);
3376                 goto reset;
3377         }
3378 #endif
3379 
3380         mmiowb();
3381 
3382         mmc_add_host(mmc);
3383 
3384         pr_info("%s: SDHCI controller on %s [%s] using %s\n",
3385                 mmc_hostname(mmc), host->hw_name, dev_name(mmc_dev(mmc)),
3386                 (host->flags & SDHCI_USE_ADMA) ?
3387                 (host->flags & SDHCI_USE_64_BIT_DMA) ? "ADMA 64-bit" : "ADMA" :
3388                 (host->flags & SDHCI_USE_SDMA) ? "DMA" : "PIO");
3389 
3390         sdhci_enable_card_detection(host);
3391 
3392         return 0;
3393 
3394 #ifdef SDHCI_USE_LEDS_CLASS
3395 reset:
3396         sdhci_do_reset(host, SDHCI_RESET_ALL);
3397         sdhci_writel(host, 0, SDHCI_INT_ENABLE);
3398         sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
3399         free_irq(host->irq, host);
3400 #endif
3401 untasklet:
3402         tasklet_kill(&host->finish_tasklet);
3403 
3404         return ret;
3405 }
3406 
3407 EXPORT_SYMBOL_GPL(sdhci_add_host);
3408 
3409 void sdhci_remove_host(struct sdhci_host *host, int dead)
3410 {
3411         struct mmc_host *mmc = host->mmc;
3412         unsigned long flags;
3413 
3414         if (dead) {
3415                 spin_lock_irqsave(&host->lock, flags);
3416 
3417                 host->flags |= SDHCI_DEVICE_DEAD;
3418 
3419                 if (host->mrq) {
3420                         pr_err("%s: Controller removed during "
3421                                 " transfer!\n", mmc_hostname(mmc));
3422 
3423                         host->mrq->cmd->error = -ENOMEDIUM;
3424                         tasklet_schedule(&host->finish_tasklet);
3425                 }
3426 
3427                 spin_unlock_irqrestore(&host->lock, flags);
3428         }
3429 
3430         sdhci_disable_card_detection(host);
3431 
3432         mmc_remove_host(mmc);
3433 
3434 #ifdef SDHCI_USE_LEDS_CLASS
3435         led_classdev_unregister(&host->led);
3436 #endif
3437 
3438         if (!dead)
3439                 sdhci_do_reset(host, SDHCI_RESET_ALL);
3440 
3441         sdhci_writel(host, 0, SDHCI_INT_ENABLE);
3442         sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
3443         free_irq(host->irq, host);
3444 
3445         del_timer_sync(&host->timer);
3446 
3447         tasklet_kill(&host->finish_tasklet);
3448 
3449         if (!IS_ERR(mmc->supply.vqmmc))
3450                 regulator_disable(mmc->supply.vqmmc);
3451 
3452         if (host->adma_table)
3453                 dma_free_coherent(mmc_dev(mmc), host->adma_table_sz,
3454                                   host->adma_table, host->adma_addr);
3455         kfree(host->align_buffer);
3456 
3457         host->adma_table = NULL;
3458         host->align_buffer = NULL;
3459 }
3460 
3461 EXPORT_SYMBOL_GPL(sdhci_remove_host);
3462 
3463 void sdhci_free_host(struct sdhci_host *host)
3464 {
3465         mmc_free_host(host->mmc);
3466 }
3467 
3468 EXPORT_SYMBOL_GPL(sdhci_free_host);
3469 
3470 /*****************************************************************************\
3471  *                                                                           *
3472  * Driver init/exit                                                          *
3473  *                                                                           *
3474 \*****************************************************************************/
3475 
3476 static int __init sdhci_drv_init(void)
3477 {
3478         pr_info(DRIVER_NAME
3479                 ": Secure Digital Host Controller Interface driver\n");
3480         pr_info(DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
3481 
3482         return 0;
3483 }
3484 
3485 static void __exit sdhci_drv_exit(void)
3486 {
3487 }
3488 
3489 module_init(sdhci_drv_init);
3490 module_exit(sdhci_drv_exit);
3491 
3492 module_param(debug_quirks, uint, 0444);
3493 module_param(debug_quirks2, uint, 0444);
3494 
3495 MODULE_AUTHOR("Pierre Ossman <pierre@ossman.eu>");
3496 MODULE_DESCRIPTION("Secure Digital Host Controller Interface core driver");
3497 MODULE_LICENSE("GPL");
3498 
3499 MODULE_PARM_DESC(debug_quirks, "Force certain quirks.");
3500 MODULE_PARM_DESC(debug_quirks2, "Force certain other quirks.");
3501 

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