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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/sdio.h>
 32 #include <linux/mmc/slot-gpio.h>
 33 
 34 #include "sdhci.h"
 35 
 36 #define DRIVER_NAME "sdhci"
 37 
 38 #define DBG(f, x...) \
 39         pr_debug(DRIVER_NAME " [%s()]: " f, __func__,## x)
 40 
 41 #if defined(CONFIG_LEDS_CLASS) || (defined(CONFIG_LEDS_CLASS_MODULE) && \
 42         defined(CONFIG_MMC_SDHCI_MODULE))
 43 #define SDHCI_USE_LEDS_CLASS
 44 #endif
 45 
 46 #define MAX_TUNING_LOOP 40
 47 
 48 static unsigned int debug_quirks = 0;
 49 static unsigned int debug_quirks2;
 50 
 51 static void sdhci_finish_data(struct sdhci_host *);
 52 
 53 static void sdhci_finish_command(struct sdhci_host *);
 54 static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode);
 55 static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable);
 56 static int sdhci_do_get_cd(struct sdhci_host *host);
 57 
 58 #ifdef CONFIG_PM
 59 static int sdhci_runtime_pm_get(struct sdhci_host *host);
 60 static int sdhci_runtime_pm_put(struct sdhci_host *host);
 61 static void sdhci_runtime_pm_bus_on(struct sdhci_host *host);
 62 static void sdhci_runtime_pm_bus_off(struct sdhci_host *host);
 63 #else
 64 static inline int sdhci_runtime_pm_get(struct sdhci_host *host)
 65 {
 66         return 0;
 67 }
 68 static inline int sdhci_runtime_pm_put(struct sdhci_host *host)
 69 {
 70         return 0;
 71 }
 72 static void sdhci_runtime_pm_bus_on(struct sdhci_host *host)
 73 {
 74 }
 75 static void sdhci_runtime_pm_bus_off(struct sdhci_host *host)
 76 {
 77 }
 78 #endif
 79 
 80 static void sdhci_dumpregs(struct sdhci_host *host)
 81 {
 82         pr_debug(DRIVER_NAME ": =========== REGISTER DUMP (%s)===========\n",
 83                 mmc_hostname(host->mmc));
 84 
 85         pr_debug(DRIVER_NAME ": Sys addr: 0x%08x | Version:  0x%08x\n",
 86                 sdhci_readl(host, SDHCI_DMA_ADDRESS),
 87                 sdhci_readw(host, SDHCI_HOST_VERSION));
 88         pr_debug(DRIVER_NAME ": Blk size: 0x%08x | Blk cnt:  0x%08x\n",
 89                 sdhci_readw(host, SDHCI_BLOCK_SIZE),
 90                 sdhci_readw(host, SDHCI_BLOCK_COUNT));
 91         pr_debug(DRIVER_NAME ": Argument: 0x%08x | Trn mode: 0x%08x\n",
 92                 sdhci_readl(host, SDHCI_ARGUMENT),
 93                 sdhci_readw(host, SDHCI_TRANSFER_MODE));
 94         pr_debug(DRIVER_NAME ": Present:  0x%08x | Host ctl: 0x%08x\n",
 95                 sdhci_readl(host, SDHCI_PRESENT_STATE),
 96                 sdhci_readb(host, SDHCI_HOST_CONTROL));
 97         pr_debug(DRIVER_NAME ": Power:    0x%08x | Blk gap:  0x%08x\n",
 98                 sdhci_readb(host, SDHCI_POWER_CONTROL),
 99                 sdhci_readb(host, SDHCI_BLOCK_GAP_CONTROL));
100         pr_debug(DRIVER_NAME ": Wake-up:  0x%08x | Clock:    0x%08x\n",
101                 sdhci_readb(host, SDHCI_WAKE_UP_CONTROL),
102                 sdhci_readw(host, SDHCI_CLOCK_CONTROL));
103         pr_debug(DRIVER_NAME ": Timeout:  0x%08x | Int stat: 0x%08x\n",
104                 sdhci_readb(host, SDHCI_TIMEOUT_CONTROL),
105                 sdhci_readl(host, SDHCI_INT_STATUS));
106         pr_debug(DRIVER_NAME ": Int enab: 0x%08x | Sig enab: 0x%08x\n",
107                 sdhci_readl(host, SDHCI_INT_ENABLE),
108                 sdhci_readl(host, SDHCI_SIGNAL_ENABLE));
109         pr_debug(DRIVER_NAME ": AC12 err: 0x%08x | Slot int: 0x%08x\n",
110                 sdhci_readw(host, SDHCI_ACMD12_ERR),
111                 sdhci_readw(host, SDHCI_SLOT_INT_STATUS));
112         pr_debug(DRIVER_NAME ": Caps:     0x%08x | Caps_1:   0x%08x\n",
113                 sdhci_readl(host, SDHCI_CAPABILITIES),
114                 sdhci_readl(host, SDHCI_CAPABILITIES_1));
115         pr_debug(DRIVER_NAME ": Cmd:      0x%08x | Max curr: 0x%08x\n",
116                 sdhci_readw(host, SDHCI_COMMAND),
117                 sdhci_readl(host, SDHCI_MAX_CURRENT));
118         pr_debug(DRIVER_NAME ": Host ctl2: 0x%08x\n",
119                 sdhci_readw(host, SDHCI_HOST_CONTROL2));
120 
121         if (host->flags & SDHCI_USE_ADMA) {
122                 if (host->flags & SDHCI_USE_64_BIT_DMA)
123                         pr_debug(DRIVER_NAME ": ADMA Err: 0x%08x | ADMA Ptr: 0x%08x%08x\n",
124                                  readl(host->ioaddr + SDHCI_ADMA_ERROR),
125                                  readl(host->ioaddr + SDHCI_ADMA_ADDRESS_HI),
126                                  readl(host->ioaddr + SDHCI_ADMA_ADDRESS));
127                 else
128                         pr_debug(DRIVER_NAME ": ADMA Err: 0x%08x | ADMA Ptr: 0x%08x\n",
129                                  readl(host->ioaddr + SDHCI_ADMA_ERROR),
130                                  readl(host->ioaddr + SDHCI_ADMA_ADDRESS));
131         }
132 
133         pr_debug(DRIVER_NAME ": ===========================================\n");
134 }
135 
136 /*****************************************************************************\
137  *                                                                           *
138  * Low level functions                                                       *
139  *                                                                           *
140 \*****************************************************************************/
141 
142 static void sdhci_set_card_detection(struct sdhci_host *host, bool enable)
143 {
144         u32 present;
145 
146         if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) ||
147             (host->mmc->caps & MMC_CAP_NONREMOVABLE))
148                 return;
149 
150         if (enable) {
151                 present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
152                                       SDHCI_CARD_PRESENT;
153 
154                 host->ier |= present ? SDHCI_INT_CARD_REMOVE :
155                                        SDHCI_INT_CARD_INSERT;
156         } else {
157                 host->ier &= ~(SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT);
158         }
159 
160         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
161         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
162 }
163 
164 static void sdhci_enable_card_detection(struct sdhci_host *host)
165 {
166         sdhci_set_card_detection(host, true);
167 }
168 
169 static void sdhci_disable_card_detection(struct sdhci_host *host)
170 {
171         sdhci_set_card_detection(host, false);
172 }
173 
174 void sdhci_reset(struct sdhci_host *host, u8 mask)
175 {
176         unsigned long timeout;
177 
178         sdhci_writeb(host, mask, SDHCI_SOFTWARE_RESET);
179 
180         if (mask & SDHCI_RESET_ALL) {
181                 host->clock = 0;
182                 /* Reset-all turns off SD Bus Power */
183                 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
184                         sdhci_runtime_pm_bus_off(host);
185         }
186 
187         /* Wait max 100 ms */
188         timeout = 100;
189 
190         /* hw clears the bit when it's done */
191         while (sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask) {
192                 if (timeout == 0) {
193                         pr_err("%s: Reset 0x%x never completed.\n",
194                                 mmc_hostname(host->mmc), (int)mask);
195                         sdhci_dumpregs(host);
196                         return;
197                 }
198                 timeout--;
199                 mdelay(1);
200         }
201 }
202 EXPORT_SYMBOL_GPL(sdhci_reset);
203 
204 static void sdhci_do_reset(struct sdhci_host *host, u8 mask)
205 {
206         if (host->quirks & SDHCI_QUIRK_NO_CARD_NO_RESET) {
207                 if (!sdhci_do_get_cd(host))
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         sdhci_enable_card_detection(host);
253 }
254 
255 static void sdhci_activate_led(struct sdhci_host *host)
256 {
257         u8 ctrl;
258 
259         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
260         ctrl |= SDHCI_CTRL_LED;
261         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
262 }
263 
264 static void sdhci_deactivate_led(struct sdhci_host *host)
265 {
266         u8 ctrl;
267 
268         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
269         ctrl &= ~SDHCI_CTRL_LED;
270         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
271 }
272 
273 #ifdef SDHCI_USE_LEDS_CLASS
274 static void sdhci_led_control(struct led_classdev *led,
275         enum led_brightness brightness)
276 {
277         struct sdhci_host *host = container_of(led, struct sdhci_host, led);
278         unsigned long flags;
279 
280         spin_lock_irqsave(&host->lock, flags);
281 
282         if (host->runtime_suspended)
283                 goto out;
284 
285         if (brightness == LED_OFF)
286                 sdhci_deactivate_led(host);
287         else
288                 sdhci_activate_led(host);
289 out:
290         spin_unlock_irqrestore(&host->lock, flags);
291 }
292 #endif
293 
294 /*****************************************************************************\
295  *                                                                           *
296  * Core functions                                                            *
297  *                                                                           *
298 \*****************************************************************************/
299 
300 static void sdhci_read_block_pio(struct sdhci_host *host)
301 {
302         unsigned long flags;
303         size_t blksize, len, chunk;
304         u32 uninitialized_var(scratch);
305         u8 *buf;
306 
307         DBG("PIO reading\n");
308 
309         blksize = host->data->blksz;
310         chunk = 0;
311 
312         local_irq_save(flags);
313 
314         while (blksize) {
315                 BUG_ON(!sg_miter_next(&host->sg_miter));
316 
317                 len = min(host->sg_miter.length, blksize);
318 
319                 blksize -= len;
320                 host->sg_miter.consumed = len;
321 
322                 buf = host->sg_miter.addr;
323 
324                 while (len) {
325                         if (chunk == 0) {
326                                 scratch = sdhci_readl(host, SDHCI_BUFFER);
327                                 chunk = 4;
328                         }
329 
330                         *buf = scratch & 0xFF;
331 
332                         buf++;
333                         scratch >>= 8;
334                         chunk--;
335                         len--;
336                 }
337         }
338 
339         sg_miter_stop(&host->sg_miter);
340 
341         local_irq_restore(flags);
342 }
343 
344 static void sdhci_write_block_pio(struct sdhci_host *host)
345 {
346         unsigned long flags;
347         size_t blksize, len, chunk;
348         u32 scratch;
349         u8 *buf;
350 
351         DBG("PIO writing\n");
352 
353         blksize = host->data->blksz;
354         chunk = 0;
355         scratch = 0;
356 
357         local_irq_save(flags);
358 
359         while (blksize) {
360                 BUG_ON(!sg_miter_next(&host->sg_miter));
361 
362                 len = min(host->sg_miter.length, blksize);
363 
364                 blksize -= len;
365                 host->sg_miter.consumed = len;
366 
367                 buf = host->sg_miter.addr;
368 
369                 while (len) {
370                         scratch |= (u32)*buf << (chunk * 8);
371 
372                         buf++;
373                         chunk++;
374                         len--;
375 
376                         if ((chunk == 4) || ((len == 0) && (blksize == 0))) {
377                                 sdhci_writel(host, scratch, SDHCI_BUFFER);
378                                 chunk = 0;
379                                 scratch = 0;
380                         }
381                 }
382         }
383 
384         sg_miter_stop(&host->sg_miter);
385 
386         local_irq_restore(flags);
387 }
388 
389 static void sdhci_transfer_pio(struct sdhci_host *host)
390 {
391         u32 mask;
392 
393         BUG_ON(!host->data);
394 
395         if (host->blocks == 0)
396                 return;
397 
398         if (host->data->flags & MMC_DATA_READ)
399                 mask = SDHCI_DATA_AVAILABLE;
400         else
401                 mask = SDHCI_SPACE_AVAILABLE;
402 
403         /*
404          * Some controllers (JMicron JMB38x) mess up the buffer bits
405          * for transfers < 4 bytes. As long as it is just one block,
406          * we can ignore the bits.
407          */
408         if ((host->quirks & SDHCI_QUIRK_BROKEN_SMALL_PIO) &&
409                 (host->data->blocks == 1))
410                 mask = ~0;
411 
412         while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) {
413                 if (host->quirks & SDHCI_QUIRK_PIO_NEEDS_DELAY)
414                         udelay(100);
415 
416                 if (host->data->flags & MMC_DATA_READ)
417                         sdhci_read_block_pio(host);
418                 else
419                         sdhci_write_block_pio(host);
420 
421                 host->blocks--;
422                 if (host->blocks == 0)
423                         break;
424         }
425 
426         DBG("PIO transfer complete.\n");
427 }
428 
429 static int sdhci_pre_dma_transfer(struct sdhci_host *host,
430                                   struct mmc_data *data, int cookie)
431 {
432         int sg_count;
433 
434         /*
435          * If the data buffers are already mapped, return the previous
436          * dma_map_sg() result.
437          */
438         if (data->host_cookie == COOKIE_PRE_MAPPED)
439                 return data->sg_count;
440 
441         sg_count = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
442                                 data->flags & MMC_DATA_WRITE ?
443                                 DMA_TO_DEVICE : DMA_FROM_DEVICE);
444 
445         if (sg_count == 0)
446                 return -ENOSPC;
447 
448         data->sg_count = sg_count;
449         data->host_cookie = cookie;
450 
451         return sg_count;
452 }
453 
454 static char *sdhci_kmap_atomic(struct scatterlist *sg, unsigned long *flags)
455 {
456         local_irq_save(*flags);
457         return kmap_atomic(sg_page(sg)) + sg->offset;
458 }
459 
460 static void sdhci_kunmap_atomic(void *buffer, unsigned long *flags)
461 {
462         kunmap_atomic(buffer);
463         local_irq_restore(*flags);
464 }
465 
466 static void sdhci_adma_write_desc(struct sdhci_host *host, void *desc,
467                                   dma_addr_t addr, int len, unsigned cmd)
468 {
469         struct sdhci_adma2_64_desc *dma_desc = desc;
470 
471         /* 32-bit and 64-bit descriptors have these members in same position */
472         dma_desc->cmd = cpu_to_le16(cmd);
473         dma_desc->len = cpu_to_le16(len);
474         dma_desc->addr_lo = cpu_to_le32((u32)addr);
475 
476         if (host->flags & SDHCI_USE_64_BIT_DMA)
477                 dma_desc->addr_hi = cpu_to_le32((u64)addr >> 32);
478 }
479 
480 static void sdhci_adma_mark_end(void *desc)
481 {
482         struct sdhci_adma2_64_desc *dma_desc = desc;
483 
484         /* 32-bit and 64-bit descriptors have 'cmd' in same position */
485         dma_desc->cmd |= cpu_to_le16(ADMA2_END);
486 }
487 
488 static void sdhci_adma_table_pre(struct sdhci_host *host,
489         struct mmc_data *data, int sg_count)
490 {
491         struct scatterlist *sg;
492         unsigned long flags;
493         dma_addr_t addr, align_addr;
494         void *desc, *align;
495         char *buffer;
496         int len, offset, i;
497 
498         /*
499          * The spec does not specify endianness of descriptor table.
500          * We currently guess that it is LE.
501          */
502 
503         host->sg_count = sg_count;
504 
505         desc = host->adma_table;
506         align = host->align_buffer;
507 
508         align_addr = host->align_addr;
509 
510         for_each_sg(data->sg, sg, host->sg_count, i) {
511                 addr = sg_dma_address(sg);
512                 len = sg_dma_len(sg);
513 
514                 /*
515                  * The SDHCI specification states that ADMA addresses must
516                  * be 32-bit aligned. If they aren't, then we use a bounce
517                  * buffer for the (up to three) bytes that screw up the
518                  * alignment.
519                  */
520                 offset = (SDHCI_ADMA2_ALIGN - (addr & SDHCI_ADMA2_MASK)) &
521                          SDHCI_ADMA2_MASK;
522                 if (offset) {
523                         if (data->flags & MMC_DATA_WRITE) {
524                                 buffer = sdhci_kmap_atomic(sg, &flags);
525                                 memcpy(align, buffer, offset);
526                                 sdhci_kunmap_atomic(buffer, &flags);
527                         }
528 
529                         /* tran, valid */
530                         sdhci_adma_write_desc(host, desc, align_addr, offset,
531                                               ADMA2_TRAN_VALID);
532 
533                         BUG_ON(offset > 65536);
534 
535                         align += SDHCI_ADMA2_ALIGN;
536                         align_addr += SDHCI_ADMA2_ALIGN;
537 
538                         desc += host->desc_sz;
539 
540                         addr += offset;
541                         len -= offset;
542                 }
543 
544                 BUG_ON(len > 65536);
545 
546                 if (len) {
547                         /* tran, valid */
548                         sdhci_adma_write_desc(host, desc, addr, len,
549                                               ADMA2_TRAN_VALID);
550                         desc += host->desc_sz;
551                 }
552 
553                 /*
554                  * If this triggers then we have a calculation bug
555                  * somewhere. :/
556                  */
557                 WARN_ON((desc - host->adma_table) >= host->adma_table_sz);
558         }
559 
560         if (host->quirks & SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC) {
561                 /* Mark the last descriptor as the terminating descriptor */
562                 if (desc != host->adma_table) {
563                         desc -= host->desc_sz;
564                         sdhci_adma_mark_end(desc);
565                 }
566         } else {
567                 /* Add a terminating entry - nop, end, valid */
568                 sdhci_adma_write_desc(host, desc, 0, 0, ADMA2_NOP_END_VALID);
569         }
570 }
571 
572 static void sdhci_adma_table_post(struct sdhci_host *host,
573         struct mmc_data *data)
574 {
575         struct scatterlist *sg;
576         int i, size;
577         void *align;
578         char *buffer;
579         unsigned long flags;
580 
581         if (data->flags & MMC_DATA_READ) {
582                 bool has_unaligned = false;
583 
584                 /* Do a quick scan of the SG list for any unaligned mappings */
585                 for_each_sg(data->sg, sg, host->sg_count, i)
586                         if (sg_dma_address(sg) & SDHCI_ADMA2_MASK) {
587                                 has_unaligned = true;
588                                 break;
589                         }
590 
591                 if (has_unaligned) {
592                         dma_sync_sg_for_cpu(mmc_dev(host->mmc), data->sg,
593                                             data->sg_len, DMA_FROM_DEVICE);
594 
595                         align = host->align_buffer;
596 
597                         for_each_sg(data->sg, sg, host->sg_count, i) {
598                                 if (sg_dma_address(sg) & SDHCI_ADMA2_MASK) {
599                                         size = SDHCI_ADMA2_ALIGN -
600                                                (sg_dma_address(sg) & SDHCI_ADMA2_MASK);
601 
602                                         buffer = sdhci_kmap_atomic(sg, &flags);
603                                         memcpy(buffer, align, size);
604                                         sdhci_kunmap_atomic(buffer, &flags);
605 
606                                         align += SDHCI_ADMA2_ALIGN;
607                                 }
608                         }
609                 }
610         }
611 }
612 
613 static u8 sdhci_calc_timeout(struct sdhci_host *host, struct mmc_command *cmd)
614 {
615         u8 count;
616         struct mmc_data *data = cmd->data;
617         unsigned target_timeout, current_timeout;
618 
619         /*
620          * If the host controller provides us with an incorrect timeout
621          * value, just skip the check and use 0xE.  The hardware may take
622          * longer to time out, but that's much better than having a too-short
623          * timeout value.
624          */
625         if (host->quirks & SDHCI_QUIRK_BROKEN_TIMEOUT_VAL)
626                 return 0xE;
627 
628         /* Unspecified timeout, assume max */
629         if (!data && !cmd->busy_timeout)
630                 return 0xE;
631 
632         /* timeout in us */
633         if (!data)
634                 target_timeout = cmd->busy_timeout * 1000;
635         else {
636                 target_timeout = DIV_ROUND_UP(data->timeout_ns, 1000);
637                 if (host->clock && data->timeout_clks) {
638                         unsigned long long val;
639 
640                         /*
641                          * data->timeout_clks is in units of clock cycles.
642                          * host->clock is in Hz.  target_timeout is in us.
643                          * Hence, us = 1000000 * cycles / Hz.  Round up.
644                          */
645                         val = 1000000 * data->timeout_clks;
646                         if (do_div(val, host->clock))
647                                 target_timeout++;
648                         target_timeout += val;
649                 }
650         }
651 
652         /*
653          * Figure out needed cycles.
654          * We do this in steps in order to fit inside a 32 bit int.
655          * The first step is the minimum timeout, which will have a
656          * minimum resolution of 6 bits:
657          * (1) 2^13*1000 > 2^22,
658          * (2) host->timeout_clk < 2^16
659          *     =>
660          *     (1) / (2) > 2^6
661          */
662         count = 0;
663         current_timeout = (1 << 13) * 1000 / host->timeout_clk;
664         while (current_timeout < target_timeout) {
665                 count++;
666                 current_timeout <<= 1;
667                 if (count >= 0xF)
668                         break;
669         }
670 
671         if (count >= 0xF) {
672                 DBG("%s: Too large timeout 0x%x requested for CMD%d!\n",
673                     mmc_hostname(host->mmc), count, cmd->opcode);
674                 count = 0xE;
675         }
676 
677         return count;
678 }
679 
680 static void sdhci_set_transfer_irqs(struct sdhci_host *host)
681 {
682         u32 pio_irqs = SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL;
683         u32 dma_irqs = SDHCI_INT_DMA_END | SDHCI_INT_ADMA_ERROR;
684 
685         if (host->flags & SDHCI_REQ_USE_DMA)
686                 host->ier = (host->ier & ~pio_irqs) | dma_irqs;
687         else
688                 host->ier = (host->ier & ~dma_irqs) | pio_irqs;
689 
690         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
691         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
692 }
693 
694 static void sdhci_set_timeout(struct sdhci_host *host, struct mmc_command *cmd)
695 {
696         u8 count;
697 
698         if (host->ops->set_timeout) {
699                 host->ops->set_timeout(host, cmd);
700         } else {
701                 count = sdhci_calc_timeout(host, cmd);
702                 sdhci_writeb(host, count, SDHCI_TIMEOUT_CONTROL);
703         }
704 }
705 
706 static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd)
707 {
708         u8 ctrl;
709         struct mmc_data *data = cmd->data;
710 
711         WARN_ON(host->data);
712 
713         if (data || (cmd->flags & MMC_RSP_BUSY))
714                 sdhci_set_timeout(host, cmd);
715 
716         if (!data)
717                 return;
718 
719         /* Sanity checks */
720         BUG_ON(data->blksz * data->blocks > 524288);
721         BUG_ON(data->blksz > host->mmc->max_blk_size);
722         BUG_ON(data->blocks > 65535);
723 
724         host->data = data;
725         host->data_early = 0;
726         host->data->bytes_xfered = 0;
727 
728         if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
729                 struct scatterlist *sg;
730                 unsigned int length_mask, offset_mask;
731                 int i;
732 
733                 host->flags |= SDHCI_REQ_USE_DMA;
734 
735                 /*
736                  * FIXME: This doesn't account for merging when mapping the
737                  * scatterlist.
738                  *
739                  * The assumption here being that alignment and lengths are
740                  * the same after DMA mapping to device address space.
741                  */
742                 length_mask = 0;
743                 offset_mask = 0;
744                 if (host->flags & SDHCI_USE_ADMA) {
745                         if (host->quirks & SDHCI_QUIRK_32BIT_ADMA_SIZE) {
746                                 length_mask = 3;
747                                 /*
748                                  * As we use up to 3 byte chunks to work
749                                  * around alignment problems, we need to
750                                  * check the offset as well.
751                                  */
752                                 offset_mask = 3;
753                         }
754                 } else {
755                         if (host->quirks & SDHCI_QUIRK_32BIT_DMA_SIZE)
756                                 length_mask = 3;
757                         if (host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR)
758                                 offset_mask = 3;
759                 }
760 
761                 if (unlikely(length_mask | offset_mask)) {
762                         for_each_sg(data->sg, sg, data->sg_len, i) {
763                                 if (sg->length & length_mask) {
764                                         DBG("Reverting to PIO because of transfer size (%d)\n",
765                                             sg->length);
766                                         host->flags &= ~SDHCI_REQ_USE_DMA;
767                                         break;
768                                 }
769                                 if (sg->offset & offset_mask) {
770                                         DBG("Reverting to PIO because of bad alignment\n");
771                                         host->flags &= ~SDHCI_REQ_USE_DMA;
772                                         break;
773                                 }
774                         }
775                 }
776         }
777 
778         if (host->flags & SDHCI_REQ_USE_DMA) {
779                 int sg_cnt = sdhci_pre_dma_transfer(host, data, COOKIE_MAPPED);
780 
781                 if (sg_cnt <= 0) {
782                         /*
783                          * This only happens when someone fed
784                          * us an invalid request.
785                          */
786                         WARN_ON(1);
787                         host->flags &= ~SDHCI_REQ_USE_DMA;
788                 } else if (host->flags & SDHCI_USE_ADMA) {
789                         sdhci_adma_table_pre(host, data, sg_cnt);
790 
791                         sdhci_writel(host, host->adma_addr, SDHCI_ADMA_ADDRESS);
792                         if (host->flags & SDHCI_USE_64_BIT_DMA)
793                                 sdhci_writel(host,
794                                              (u64)host->adma_addr >> 32,
795                                              SDHCI_ADMA_ADDRESS_HI);
796                 } else {
797                         WARN_ON(sg_cnt != 1);
798                         sdhci_writel(host, sg_dma_address(data->sg),
799                                 SDHCI_DMA_ADDRESS);
800                 }
801         }
802 
803         /*
804          * Always adjust the DMA selection as some controllers
805          * (e.g. JMicron) can't do PIO properly when the selection
806          * is ADMA.
807          */
808         if (host->version >= SDHCI_SPEC_200) {
809                 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
810                 ctrl &= ~SDHCI_CTRL_DMA_MASK;
811                 if ((host->flags & SDHCI_REQ_USE_DMA) &&
812                         (host->flags & SDHCI_USE_ADMA)) {
813                         if (host->flags & SDHCI_USE_64_BIT_DMA)
814                                 ctrl |= SDHCI_CTRL_ADMA64;
815                         else
816                                 ctrl |= SDHCI_CTRL_ADMA32;
817                 } else {
818                         ctrl |= SDHCI_CTRL_SDMA;
819                 }
820                 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
821         }
822 
823         if (!(host->flags & SDHCI_REQ_USE_DMA)) {
824                 int flags;
825 
826                 flags = SG_MITER_ATOMIC;
827                 if (host->data->flags & MMC_DATA_READ)
828                         flags |= SG_MITER_TO_SG;
829                 else
830                         flags |= SG_MITER_FROM_SG;
831                 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
832                 host->blocks = data->blocks;
833         }
834 
835         sdhci_set_transfer_irqs(host);
836 
837         /* Set the DMA boundary value and block size */
838         sdhci_writew(host, SDHCI_MAKE_BLKSZ(SDHCI_DEFAULT_BOUNDARY_ARG,
839                 data->blksz), SDHCI_BLOCK_SIZE);
840         sdhci_writew(host, data->blocks, SDHCI_BLOCK_COUNT);
841 }
842 
843 static void sdhci_set_transfer_mode(struct sdhci_host *host,
844         struct mmc_command *cmd)
845 {
846         u16 mode = 0;
847         struct mmc_data *data = cmd->data;
848 
849         if (data == NULL) {
850                 if (host->quirks2 &
851                         SDHCI_QUIRK2_CLEAR_TRANSFERMODE_REG_BEFORE_CMD) {
852                         sdhci_writew(host, 0x0, SDHCI_TRANSFER_MODE);
853                 } else {
854                 /* clear Auto CMD settings for no data CMDs */
855                         mode = sdhci_readw(host, SDHCI_TRANSFER_MODE);
856                         sdhci_writew(host, mode & ~(SDHCI_TRNS_AUTO_CMD12 |
857                                 SDHCI_TRNS_AUTO_CMD23), SDHCI_TRANSFER_MODE);
858                 }
859                 return;
860         }
861 
862         WARN_ON(!host->data);
863 
864         if (!(host->quirks2 & SDHCI_QUIRK2_SUPPORT_SINGLE))
865                 mode = SDHCI_TRNS_BLK_CNT_EN;
866 
867         if (mmc_op_multi(cmd->opcode) || data->blocks > 1) {
868                 mode = SDHCI_TRNS_BLK_CNT_EN | SDHCI_TRNS_MULTI;
869                 /*
870                  * If we are sending CMD23, CMD12 never gets sent
871                  * on successful completion (so no Auto-CMD12).
872                  */
873                 if (!host->mrq->sbc && (host->flags & SDHCI_AUTO_CMD12) &&
874                     (cmd->opcode != SD_IO_RW_EXTENDED))
875                         mode |= SDHCI_TRNS_AUTO_CMD12;
876                 else if (host->mrq->sbc && (host->flags & SDHCI_AUTO_CMD23)) {
877                         mode |= SDHCI_TRNS_AUTO_CMD23;
878                         sdhci_writel(host, host->mrq->sbc->arg, SDHCI_ARGUMENT2);
879                 }
880         }
881 
882         if (data->flags & MMC_DATA_READ)
883                 mode |= SDHCI_TRNS_READ;
884         if (host->flags & SDHCI_REQ_USE_DMA)
885                 mode |= SDHCI_TRNS_DMA;
886 
887         sdhci_writew(host, mode, SDHCI_TRANSFER_MODE);
888 }
889 
890 static void sdhci_finish_data(struct sdhci_host *host)
891 {
892         struct mmc_data *data;
893 
894         BUG_ON(!host->data);
895 
896         data = host->data;
897         host->data = NULL;
898 
899         if ((host->flags & (SDHCI_REQ_USE_DMA | SDHCI_USE_ADMA)) ==
900             (SDHCI_REQ_USE_DMA | SDHCI_USE_ADMA))
901                 sdhci_adma_table_post(host, data);
902 
903         /*
904          * The specification states that the block count register must
905          * be updated, but it does not specify at what point in the
906          * data flow. That makes the register entirely useless to read
907          * back so we have to assume that nothing made it to the card
908          * in the event of an error.
909          */
910         if (data->error)
911                 data->bytes_xfered = 0;
912         else
913                 data->bytes_xfered = data->blksz * data->blocks;
914 
915         /*
916          * Need to send CMD12 if -
917          * a) open-ended multiblock transfer (no CMD23)
918          * b) error in multiblock transfer
919          */
920         if (data->stop &&
921             (data->error ||
922              !host->mrq->sbc)) {
923 
924                 /*
925                  * The controller needs a reset of internal state machines
926                  * upon error conditions.
927                  */
928                 if (data->error) {
929                         sdhci_do_reset(host, SDHCI_RESET_CMD);
930                         sdhci_do_reset(host, SDHCI_RESET_DATA);
931                 }
932 
933                 sdhci_send_command(host, data->stop);
934         } else
935                 tasklet_schedule(&host->finish_tasklet);
936 }
937 
938 void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
939 {
940         int flags;
941         u32 mask;
942         unsigned long timeout;
943 
944         WARN_ON(host->cmd);
945 
946         /* Initially, a command has no error */
947         cmd->error = 0;
948 
949         /* Wait max 10 ms */
950         timeout = 10;
951 
952         mask = SDHCI_CMD_INHIBIT;
953         if ((cmd->data != NULL) || (cmd->flags & MMC_RSP_BUSY))
954                 mask |= SDHCI_DATA_INHIBIT;
955 
956         /* We shouldn't wait for data inihibit for stop commands, even
957            though they might use busy signaling */
958         if (host->mrq->data && (cmd == host->mrq->data->stop))
959                 mask &= ~SDHCI_DATA_INHIBIT;
960 
961         while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) {
962                 if (timeout == 0) {
963                         pr_err("%s: Controller never released inhibit bit(s).\n",
964                                mmc_hostname(host->mmc));
965                         sdhci_dumpregs(host);
966                         cmd->error = -EIO;
967                         tasklet_schedule(&host->finish_tasklet);
968                         return;
969                 }
970                 timeout--;
971                 mdelay(1);
972         }
973 
974         timeout = jiffies;
975         if (!cmd->data && cmd->busy_timeout > 9000)
976                 timeout += DIV_ROUND_UP(cmd->busy_timeout, 1000) * HZ + HZ;
977         else
978                 timeout += 10 * HZ;
979         mod_timer(&host->timer, timeout);
980 
981         host->cmd = cmd;
982         host->busy_handle = 0;
983 
984         sdhci_prepare_data(host, cmd);
985 
986         sdhci_writel(host, cmd->arg, SDHCI_ARGUMENT);
987 
988         sdhci_set_transfer_mode(host, cmd);
989 
990         if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
991                 pr_err("%s: Unsupported response type!\n",
992                         mmc_hostname(host->mmc));
993                 cmd->error = -EINVAL;
994                 tasklet_schedule(&host->finish_tasklet);
995                 return;
996         }
997 
998         if (!(cmd->flags & MMC_RSP_PRESENT))
999                 flags = SDHCI_CMD_RESP_NONE;
1000         else if (cmd->flags & MMC_RSP_136)
1001                 flags = SDHCI_CMD_RESP_LONG;
1002         else if (cmd->flags & MMC_RSP_BUSY)
1003                 flags = SDHCI_CMD_RESP_SHORT_BUSY;
1004         else
1005                 flags = SDHCI_CMD_RESP_SHORT;
1006 
1007         if (cmd->flags & MMC_RSP_CRC)
1008                 flags |= SDHCI_CMD_CRC;
1009         if (cmd->flags & MMC_RSP_OPCODE)
1010                 flags |= SDHCI_CMD_INDEX;
1011 
1012         /* CMD19 is special in that the Data Present Select should be set */
1013         if (cmd->data || cmd->opcode == MMC_SEND_TUNING_BLOCK ||
1014             cmd->opcode == MMC_SEND_TUNING_BLOCK_HS200)
1015                 flags |= SDHCI_CMD_DATA;
1016 
1017         sdhci_writew(host, SDHCI_MAKE_CMD(cmd->opcode, flags), SDHCI_COMMAND);
1018 }
1019 EXPORT_SYMBOL_GPL(sdhci_send_command);
1020 
1021 static void sdhci_finish_command(struct sdhci_host *host)
1022 {
1023         int i;
1024 
1025         BUG_ON(host->cmd == NULL);
1026 
1027         if (host->cmd->flags & MMC_RSP_PRESENT) {
1028                 if (host->cmd->flags & MMC_RSP_136) {
1029                         /* CRC is stripped so we need to do some shifting. */
1030                         for (i = 0;i < 4;i++) {
1031                                 host->cmd->resp[i] = sdhci_readl(host,
1032                                         SDHCI_RESPONSE + (3-i)*4) << 8;
1033                                 if (i != 3)
1034                                         host->cmd->resp[i] |=
1035                                                 sdhci_readb(host,
1036                                                 SDHCI_RESPONSE + (3-i)*4-1);
1037                         }
1038                 } else {
1039                         host->cmd->resp[0] = sdhci_readl(host, SDHCI_RESPONSE);
1040                 }
1041         }
1042 
1043         /* Finished CMD23, now send actual command. */
1044         if (host->cmd == host->mrq->sbc) {
1045                 host->cmd = NULL;
1046                 sdhci_send_command(host, host->mrq->cmd);
1047         } else {
1048 
1049                 /* Processed actual command. */
1050                 if (host->data && host->data_early)
1051                         sdhci_finish_data(host);
1052 
1053                 if (!host->cmd->data)
1054                         tasklet_schedule(&host->finish_tasklet);
1055 
1056                 host->cmd = NULL;
1057         }
1058 }
1059 
1060 static u16 sdhci_get_preset_value(struct sdhci_host *host)
1061 {
1062         u16 preset = 0;
1063 
1064         switch (host->timing) {
1065         case MMC_TIMING_UHS_SDR12:
1066                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR12);
1067                 break;
1068         case MMC_TIMING_UHS_SDR25:
1069                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR25);
1070                 break;
1071         case MMC_TIMING_UHS_SDR50:
1072                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR50);
1073                 break;
1074         case MMC_TIMING_UHS_SDR104:
1075         case MMC_TIMING_MMC_HS200:
1076                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR104);
1077                 break;
1078         case MMC_TIMING_UHS_DDR50:
1079         case MMC_TIMING_MMC_DDR52:
1080                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_DDR50);
1081                 break;
1082         case MMC_TIMING_MMC_HS400:
1083                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_HS400);
1084                 break;
1085         default:
1086                 pr_warn("%s: Invalid UHS-I mode selected\n",
1087                         mmc_hostname(host->mmc));
1088                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR12);
1089                 break;
1090         }
1091         return preset;
1092 }
1093 
1094 void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
1095 {
1096         int div = 0; /* Initialized for compiler warning */
1097         int real_div = div, clk_mul = 1;
1098         u16 clk = 0;
1099         unsigned long timeout;
1100         bool switch_base_clk = false;
1101 
1102         host->mmc->actual_clock = 0;
1103 
1104         sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
1105         if (host->quirks2 & SDHCI_QUIRK2_NEED_DELAY_AFTER_INT_CLK_RST)
1106                 mdelay(1);
1107 
1108         if (clock == 0)
1109                 return;
1110 
1111         if (host->version >= SDHCI_SPEC_300) {
1112                 if (host->preset_enabled) {
1113                         u16 pre_val;
1114 
1115                         clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1116                         pre_val = sdhci_get_preset_value(host);
1117                         div = (pre_val & SDHCI_PRESET_SDCLK_FREQ_MASK)
1118                                 >> SDHCI_PRESET_SDCLK_FREQ_SHIFT;
1119                         if (host->clk_mul &&
1120                                 (pre_val & SDHCI_PRESET_CLKGEN_SEL_MASK)) {
1121                                 clk = SDHCI_PROG_CLOCK_MODE;
1122                                 real_div = div + 1;
1123                                 clk_mul = host->clk_mul;
1124                         } else {
1125                                 real_div = max_t(int, 1, div << 1);
1126                         }
1127                         goto clock_set;
1128                 }
1129 
1130                 /*
1131                  * Check if the Host Controller supports Programmable Clock
1132                  * Mode.
1133                  */
1134                 if (host->clk_mul) {
1135                         for (div = 1; div <= 1024; div++) {
1136                                 if ((host->max_clk * host->clk_mul / div)
1137                                         <= clock)
1138                                         break;
1139                         }
1140                         if ((host->max_clk * host->clk_mul / div) <= clock) {
1141                                 /*
1142                                  * Set Programmable Clock Mode in the Clock
1143                                  * Control register.
1144                                  */
1145                                 clk = SDHCI_PROG_CLOCK_MODE;
1146                                 real_div = div;
1147                                 clk_mul = host->clk_mul;
1148                                 div--;
1149                         } else {
1150                                 /*
1151                                  * Divisor can be too small to reach clock
1152                                  * speed requirement. Then use the base clock.
1153                                  */
1154                                 switch_base_clk = true;
1155                         }
1156                 }
1157 
1158                 if (!host->clk_mul || switch_base_clk) {
1159                         /* Version 3.00 divisors must be a multiple of 2. */
1160                         if (host->max_clk <= clock)
1161                                 div = 1;
1162                         else {
1163                                 for (div = 2; div < SDHCI_MAX_DIV_SPEC_300;
1164                                      div += 2) {
1165                                         if ((host->max_clk / div) <= clock)
1166                                                 break;
1167                                 }
1168                         }
1169                         real_div = div;
1170                         div >>= 1;
1171                         if ((host->quirks2 & SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN)
1172                                 && !div && host->max_clk <= 25000000)
1173                                 div = 1;
1174                 }
1175         } else {
1176                 /* Version 2.00 divisors must be a power of 2. */
1177                 for (div = 1; div < SDHCI_MAX_DIV_SPEC_200; div *= 2) {
1178                         if ((host->max_clk / div) <= clock)
1179                                 break;
1180                 }
1181                 real_div = div;
1182                 div >>= 1;
1183         }
1184 
1185 clock_set:
1186         if (real_div)
1187                 host->mmc->actual_clock = (host->max_clk * clk_mul) / real_div;
1188         clk |= (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT;
1189         clk |= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN)
1190                 << SDHCI_DIVIDER_HI_SHIFT;
1191         clk |= SDHCI_CLOCK_INT_EN;
1192         sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1193 
1194         /* Wait max 20 ms */
1195         timeout = 20;
1196         while (!((clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL))
1197                 & SDHCI_CLOCK_INT_STABLE)) {
1198                 if (timeout == 0) {
1199                         pr_err("%s: Internal clock never stabilised.\n",
1200                                mmc_hostname(host->mmc));
1201                         sdhci_dumpregs(host);
1202                         return;
1203                 }
1204                 timeout--;
1205                 mdelay(1);
1206         }
1207 
1208         clk |= SDHCI_CLOCK_CARD_EN;
1209         sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1210 }
1211 EXPORT_SYMBOL_GPL(sdhci_set_clock);
1212 
1213 static void sdhci_set_power_reg(struct sdhci_host *host, unsigned char mode,
1214                                 unsigned short vdd)
1215 {
1216         struct mmc_host *mmc = host->mmc;
1217 
1218         spin_unlock_irq(&host->lock);
1219         mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
1220         spin_lock_irq(&host->lock);
1221 
1222         if (mode != MMC_POWER_OFF)
1223                 sdhci_writeb(host, SDHCI_POWER_ON, SDHCI_POWER_CONTROL);
1224         else
1225                 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
1226 }
1227 
1228 void sdhci_set_power(struct sdhci_host *host, unsigned char mode,
1229                      unsigned short vdd)
1230 {
1231         u8 pwr = 0;
1232 
1233         if (mode != MMC_POWER_OFF) {
1234                 switch (1 << vdd) {
1235                 case MMC_VDD_165_195:
1236                         pwr = SDHCI_POWER_180;
1237                         break;
1238                 case MMC_VDD_29_30:
1239                 case MMC_VDD_30_31:
1240                         pwr = SDHCI_POWER_300;
1241                         break;
1242                 case MMC_VDD_32_33:
1243                 case MMC_VDD_33_34:
1244                         pwr = SDHCI_POWER_330;
1245                         break;
1246                 default:
1247                         WARN(1, "%s: Invalid vdd %#x\n",
1248                              mmc_hostname(host->mmc), vdd);
1249                         break;
1250                 }
1251         }
1252 
1253         if (host->pwr == pwr)
1254                 return;
1255 
1256         host->pwr = pwr;
1257 
1258         if (pwr == 0) {
1259                 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
1260                 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
1261                         sdhci_runtime_pm_bus_off(host);
1262         } else {
1263                 /*
1264                  * Spec says that we should clear the power reg before setting
1265                  * a new value. Some controllers don't seem to like this though.
1266                  */
1267                 if (!(host->quirks & SDHCI_QUIRK_SINGLE_POWER_WRITE))
1268                         sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
1269 
1270                 /*
1271                  * At least the Marvell CaFe chip gets confused if we set the
1272                  * voltage and set turn on power at the same time, so set the
1273                  * voltage first.
1274                  */
1275                 if (host->quirks & SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER)
1276                         sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
1277 
1278                 pwr |= SDHCI_POWER_ON;
1279 
1280                 sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
1281 
1282                 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
1283                         sdhci_runtime_pm_bus_on(host);
1284 
1285                 /*
1286                  * Some controllers need an extra 10ms delay of 10ms before
1287                  * they can apply clock after applying power
1288                  */
1289                 if (host->quirks & SDHCI_QUIRK_DELAY_AFTER_POWER)
1290                         mdelay(10);
1291         }
1292 }
1293 EXPORT_SYMBOL_GPL(sdhci_set_power);
1294 
1295 static void __sdhci_set_power(struct sdhci_host *host, unsigned char mode,
1296                               unsigned short vdd)
1297 {
1298         struct mmc_host *mmc = host->mmc;
1299 
1300         if (host->ops->set_power)
1301                 host->ops->set_power(host, mode, vdd);
1302         else if (!IS_ERR(mmc->supply.vmmc))
1303                 sdhci_set_power_reg(host, mode, vdd);
1304         else
1305                 sdhci_set_power(host, mode, vdd);
1306 }
1307 
1308 /*****************************************************************************\
1309  *                                                                           *
1310  * MMC callbacks                                                             *
1311  *                                                                           *
1312 \*****************************************************************************/
1313 
1314 static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
1315 {
1316         struct sdhci_host *host;
1317         int present;
1318         unsigned long flags;
1319 
1320         host = mmc_priv(mmc);
1321 
1322         sdhci_runtime_pm_get(host);
1323 
1324         /* Firstly check card presence */
1325         present = mmc->ops->get_cd(mmc);
1326 
1327         spin_lock_irqsave(&host->lock, flags);
1328 
1329         WARN_ON(host->mrq != NULL);
1330 
1331 #ifndef SDHCI_USE_LEDS_CLASS
1332         sdhci_activate_led(host);
1333 #endif
1334 
1335         /*
1336          * Ensure we don't send the STOP for non-SET_BLOCK_COUNTED
1337          * requests if Auto-CMD12 is enabled.
1338          */
1339         if (!mrq->sbc && (host->flags & SDHCI_AUTO_CMD12)) {
1340                 if (mrq->stop) {
1341                         mrq->data->stop = NULL;
1342                         mrq->stop = NULL;
1343                 }
1344         }
1345 
1346         host->mrq = mrq;
1347 
1348         if (!present || host->flags & SDHCI_DEVICE_DEAD) {
1349                 host->mrq->cmd->error = -ENOMEDIUM;
1350                 tasklet_schedule(&host->finish_tasklet);
1351         } else {
1352                 if (mrq->sbc && !(host->flags & SDHCI_AUTO_CMD23))
1353                         sdhci_send_command(host, mrq->sbc);
1354                 else
1355                         sdhci_send_command(host, mrq->cmd);
1356         }
1357 
1358         mmiowb();
1359         spin_unlock_irqrestore(&host->lock, flags);
1360 }
1361 
1362 void sdhci_set_bus_width(struct sdhci_host *host, int width)
1363 {
1364         u8 ctrl;
1365 
1366         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
1367         if (width == MMC_BUS_WIDTH_8) {
1368                 ctrl &= ~SDHCI_CTRL_4BITBUS;
1369                 if (host->version >= SDHCI_SPEC_300)
1370                         ctrl |= SDHCI_CTRL_8BITBUS;
1371         } else {
1372                 if (host->version >= SDHCI_SPEC_300)
1373                         ctrl &= ~SDHCI_CTRL_8BITBUS;
1374                 if (width == MMC_BUS_WIDTH_4)
1375                         ctrl |= SDHCI_CTRL_4BITBUS;
1376                 else
1377                         ctrl &= ~SDHCI_CTRL_4BITBUS;
1378         }
1379         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1380 }
1381 EXPORT_SYMBOL_GPL(sdhci_set_bus_width);
1382 
1383 void sdhci_set_uhs_signaling(struct sdhci_host *host, unsigned timing)
1384 {
1385         u16 ctrl_2;
1386 
1387         ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1388         /* Select Bus Speed Mode for host */
1389         ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
1390         if ((timing == MMC_TIMING_MMC_HS200) ||
1391             (timing == MMC_TIMING_UHS_SDR104))
1392                 ctrl_2 |= SDHCI_CTRL_UHS_SDR104;
1393         else if (timing == MMC_TIMING_UHS_SDR12)
1394                 ctrl_2 |= SDHCI_CTRL_UHS_SDR12;
1395         else if (timing == MMC_TIMING_UHS_SDR25)
1396                 ctrl_2 |= SDHCI_CTRL_UHS_SDR25;
1397         else if (timing == MMC_TIMING_UHS_SDR50)
1398                 ctrl_2 |= SDHCI_CTRL_UHS_SDR50;
1399         else if ((timing == MMC_TIMING_UHS_DDR50) ||
1400                  (timing == MMC_TIMING_MMC_DDR52))
1401                 ctrl_2 |= SDHCI_CTRL_UHS_DDR50;
1402         else if (timing == MMC_TIMING_MMC_HS400)
1403                 ctrl_2 |= SDHCI_CTRL_HS400; /* Non-standard */
1404         sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
1405 }
1406 EXPORT_SYMBOL_GPL(sdhci_set_uhs_signaling);
1407 
1408 static void sdhci_do_set_ios(struct sdhci_host *host, struct mmc_ios *ios)
1409 {
1410         unsigned long flags;
1411         u8 ctrl;
1412         struct mmc_host *mmc = host->mmc;
1413 
1414         spin_lock_irqsave(&host->lock, flags);
1415 
1416         if (host->flags & SDHCI_DEVICE_DEAD) {
1417                 spin_unlock_irqrestore(&host->lock, flags);
1418                 if (!IS_ERR(mmc->supply.vmmc) &&
1419                     ios->power_mode == MMC_POWER_OFF)
1420                         mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
1421                 return;
1422         }
1423 
1424         /*
1425          * Reset the chip on each power off.
1426          * Should clear out any weird states.
1427          */
1428         if (ios->power_mode == MMC_POWER_OFF) {
1429                 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
1430                 sdhci_reinit(host);
1431         }
1432 
1433         if (host->version >= SDHCI_SPEC_300 &&
1434                 (ios->power_mode == MMC_POWER_UP) &&
1435                 !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN))
1436                 sdhci_enable_preset_value(host, false);
1437 
1438         if (!ios->clock || ios->clock != host->clock) {
1439                 host->ops->set_clock(host, ios->clock);
1440                 host->clock = ios->clock;
1441 
1442                 if (host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK &&
1443                     host->clock) {
1444                         host->timeout_clk = host->mmc->actual_clock ?
1445                                                 host->mmc->actual_clock / 1000 :
1446                                                 host->clock / 1000;
1447                         host->mmc->max_busy_timeout =
1448                                 host->ops->get_max_timeout_count ?
1449                                 host->ops->get_max_timeout_count(host) :
1450                                 1 << 27;
1451                         host->mmc->max_busy_timeout /= host->timeout_clk;
1452                 }
1453         }
1454 
1455         __sdhci_set_power(host, ios->power_mode, ios->vdd);
1456 
1457         if (host->ops->platform_send_init_74_clocks)
1458                 host->ops->platform_send_init_74_clocks(host, ios->power_mode);
1459 
1460         host->ops->set_bus_width(host, ios->bus_width);
1461 
1462         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
1463 
1464         if ((ios->timing == MMC_TIMING_SD_HS ||
1465              ios->timing == MMC_TIMING_MMC_HS)
1466             && !(host->quirks & SDHCI_QUIRK_NO_HISPD_BIT))
1467                 ctrl |= SDHCI_CTRL_HISPD;
1468         else
1469                 ctrl &= ~SDHCI_CTRL_HISPD;
1470 
1471         if (host->version >= SDHCI_SPEC_300) {
1472                 u16 clk, ctrl_2;
1473 
1474                 /* In case of UHS-I modes, set High Speed Enable */
1475                 if ((ios->timing == MMC_TIMING_MMC_HS400) ||
1476                     (ios->timing == MMC_TIMING_MMC_HS200) ||
1477                     (ios->timing == MMC_TIMING_MMC_DDR52) ||
1478                     (ios->timing == MMC_TIMING_UHS_SDR50) ||
1479                     (ios->timing == MMC_TIMING_UHS_SDR104) ||
1480                     (ios->timing == MMC_TIMING_UHS_DDR50) ||
1481                     (ios->timing == MMC_TIMING_UHS_SDR25))
1482                         ctrl |= SDHCI_CTRL_HISPD;
1483 
1484                 if (!host->preset_enabled) {
1485                         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1486                         /*
1487                          * We only need to set Driver Strength if the
1488                          * preset value enable is not set.
1489                          */
1490                         ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1491                         ctrl_2 &= ~SDHCI_CTRL_DRV_TYPE_MASK;
1492                         if (ios->drv_type == MMC_SET_DRIVER_TYPE_A)
1493                                 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_A;
1494                         else if (ios->drv_type == MMC_SET_DRIVER_TYPE_B)
1495                                 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_B;
1496                         else if (ios->drv_type == MMC_SET_DRIVER_TYPE_C)
1497                                 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_C;
1498                         else if (ios->drv_type == MMC_SET_DRIVER_TYPE_D)
1499                                 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_D;
1500                         else {
1501                                 pr_warn("%s: invalid driver type, default to driver type B\n",
1502                                         mmc_hostname(mmc));
1503                                 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_B;
1504                         }
1505 
1506                         sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
1507                 } else {
1508                         /*
1509                          * According to SDHC Spec v3.00, if the Preset Value
1510                          * Enable in the Host Control 2 register is set, we
1511                          * need to reset SD Clock Enable before changing High
1512                          * Speed Enable to avoid generating clock gliches.
1513                          */
1514 
1515                         /* Reset SD Clock Enable */
1516                         clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1517                         clk &= ~SDHCI_CLOCK_CARD_EN;
1518                         sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1519 
1520                         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1521 
1522                         /* Re-enable SD Clock */
1523                         host->ops->set_clock(host, host->clock);
1524                 }
1525 
1526                 /* Reset SD Clock Enable */
1527                 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1528                 clk &= ~SDHCI_CLOCK_CARD_EN;
1529                 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1530 
1531                 host->ops->set_uhs_signaling(host, ios->timing);
1532                 host->timing = ios->timing;
1533 
1534                 if (!(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN) &&
1535                                 ((ios->timing == MMC_TIMING_UHS_SDR12) ||
1536                                  (ios->timing == MMC_TIMING_UHS_SDR25) ||
1537                                  (ios->timing == MMC_TIMING_UHS_SDR50) ||
1538                                  (ios->timing == MMC_TIMING_UHS_SDR104) ||
1539                                  (ios->timing == MMC_TIMING_UHS_DDR50) ||
1540                                  (ios->timing == MMC_TIMING_MMC_DDR52))) {
1541                         u16 preset;
1542 
1543                         sdhci_enable_preset_value(host, true);
1544                         preset = sdhci_get_preset_value(host);
1545                         ios->drv_type = (preset & SDHCI_PRESET_DRV_MASK)
1546                                 >> SDHCI_PRESET_DRV_SHIFT;
1547                 }
1548 
1549                 /* Re-enable SD Clock */
1550                 host->ops->set_clock(host, host->clock);
1551         } else
1552                 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1553 
1554         /*
1555          * Some (ENE) controllers go apeshit on some ios operation,
1556          * signalling timeout and CRC errors even on CMD0. Resetting
1557          * it on each ios seems to solve the problem.
1558          */
1559         if (host->quirks & SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS)
1560                 sdhci_do_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
1561 
1562         mmiowb();
1563         spin_unlock_irqrestore(&host->lock, flags);
1564 }
1565 
1566 static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1567 {
1568         struct sdhci_host *host = mmc_priv(mmc);
1569 
1570         sdhci_runtime_pm_get(host);
1571         sdhci_do_set_ios(host, ios);
1572         sdhci_runtime_pm_put(host);
1573 }
1574 
1575 static int sdhci_do_get_cd(struct sdhci_host *host)
1576 {
1577         int gpio_cd = mmc_gpio_get_cd(host->mmc);
1578 
1579         if (host->flags & SDHCI_DEVICE_DEAD)
1580                 return 0;
1581 
1582         /* If nonremovable, assume that the card is always present. */
1583         if (host->mmc->caps & MMC_CAP_NONREMOVABLE)
1584                 return 1;
1585 
1586         /*
1587          * Try slot gpio detect, if defined it take precedence
1588          * over build in controller functionality
1589          */
1590         if (!IS_ERR_VALUE(gpio_cd))
1591                 return !!gpio_cd;
1592 
1593         /* If polling, assume that the card is always present. */
1594         if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
1595                 return 1;
1596 
1597         /* Host native card detect */
1598         return !!(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT);
1599 }
1600 
1601 static int sdhci_get_cd(struct mmc_host *mmc)
1602 {
1603         struct sdhci_host *host = mmc_priv(mmc);
1604         int ret;
1605 
1606         sdhci_runtime_pm_get(host);
1607         ret = sdhci_do_get_cd(host);
1608         sdhci_runtime_pm_put(host);
1609         return ret;
1610 }
1611 
1612 static int sdhci_check_ro(struct sdhci_host *host)
1613 {
1614         unsigned long flags;
1615         int is_readonly;
1616 
1617         spin_lock_irqsave(&host->lock, flags);
1618 
1619         if (host->flags & SDHCI_DEVICE_DEAD)
1620                 is_readonly = 0;
1621         else if (host->ops->get_ro)
1622                 is_readonly = host->ops->get_ro(host);
1623         else
1624                 is_readonly = !(sdhci_readl(host, SDHCI_PRESENT_STATE)
1625                                 & SDHCI_WRITE_PROTECT);
1626 
1627         spin_unlock_irqrestore(&host->lock, flags);
1628 
1629         /* This quirk needs to be replaced by a callback-function later */
1630         return host->quirks & SDHCI_QUIRK_INVERTED_WRITE_PROTECT ?
1631                 !is_readonly : is_readonly;
1632 }
1633 
1634 #define SAMPLE_COUNT    5
1635 
1636 static int sdhci_do_get_ro(struct sdhci_host *host)
1637 {
1638         int i, ro_count;
1639 
1640         if (!(host->quirks & SDHCI_QUIRK_UNSTABLE_RO_DETECT))
1641                 return sdhci_check_ro(host);
1642 
1643         ro_count = 0;
1644         for (i = 0; i < SAMPLE_COUNT; i++) {
1645                 if (sdhci_check_ro(host)) {
1646                         if (++ro_count > SAMPLE_COUNT / 2)
1647                                 return 1;
1648                 }
1649                 msleep(30);
1650         }
1651         return 0;
1652 }
1653 
1654 static void sdhci_hw_reset(struct mmc_host *mmc)
1655 {
1656         struct sdhci_host *host = mmc_priv(mmc);
1657 
1658         if (host->ops && host->ops->hw_reset)
1659                 host->ops->hw_reset(host);
1660 }
1661 
1662 static int sdhci_get_ro(struct mmc_host *mmc)
1663 {
1664         struct sdhci_host *host = mmc_priv(mmc);
1665         int ret;
1666 
1667         sdhci_runtime_pm_get(host);
1668         ret = sdhci_do_get_ro(host);
1669         sdhci_runtime_pm_put(host);
1670         return ret;
1671 }
1672 
1673 static void sdhci_enable_sdio_irq_nolock(struct sdhci_host *host, int enable)
1674 {
1675         if (!(host->flags & SDHCI_DEVICE_DEAD)) {
1676                 if (enable)
1677                         host->ier |= SDHCI_INT_CARD_INT;
1678                 else
1679                         host->ier &= ~SDHCI_INT_CARD_INT;
1680 
1681                 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
1682                 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
1683                 mmiowb();
1684         }
1685 }
1686 
1687 static void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable)
1688 {
1689         struct sdhci_host *host = mmc_priv(mmc);
1690         unsigned long flags;
1691 
1692         sdhci_runtime_pm_get(host);
1693 
1694         spin_lock_irqsave(&host->lock, flags);
1695         if (enable)
1696                 host->flags |= SDHCI_SDIO_IRQ_ENABLED;
1697         else
1698                 host->flags &= ~SDHCI_SDIO_IRQ_ENABLED;
1699 
1700         sdhci_enable_sdio_irq_nolock(host, enable);
1701         spin_unlock_irqrestore(&host->lock, flags);
1702 
1703         sdhci_runtime_pm_put(host);
1704 }
1705 
1706 static int sdhci_do_start_signal_voltage_switch(struct sdhci_host *host,
1707                                                 struct mmc_ios *ios)
1708 {
1709         struct mmc_host *mmc = host->mmc;
1710         u16 ctrl;
1711         int ret;
1712 
1713         /*
1714          * Signal Voltage Switching is only applicable for Host Controllers
1715          * v3.00 and above.
1716          */
1717         if (host->version < SDHCI_SPEC_300)
1718                 return 0;
1719 
1720         ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1721 
1722         switch (ios->signal_voltage) {
1723         case MMC_SIGNAL_VOLTAGE_330:
1724                 /* Set 1.8V Signal Enable in the Host Control2 register to 0 */
1725                 ctrl &= ~SDHCI_CTRL_VDD_180;
1726                 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1727 
1728                 if (!IS_ERR(mmc->supply.vqmmc)) {
1729                         ret = regulator_set_voltage(mmc->supply.vqmmc, 2700000,
1730                                                     3600000);
1731                         if (ret) {
1732                                 pr_warn("%s: Switching to 3.3V signalling voltage failed\n",
1733                                         mmc_hostname(mmc));
1734                                 return -EIO;
1735                         }
1736                 }
1737                 /* Wait for 5ms */
1738                 usleep_range(5000, 5500);
1739 
1740                 /* 3.3V regulator output should be stable within 5 ms */
1741                 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1742                 if (!(ctrl & SDHCI_CTRL_VDD_180))
1743                         return 0;
1744 
1745                 pr_warn("%s: 3.3V regulator output did not became stable\n",
1746                         mmc_hostname(mmc));
1747 
1748                 return -EAGAIN;
1749         case MMC_SIGNAL_VOLTAGE_180:
1750                 if (!IS_ERR(mmc->supply.vqmmc)) {
1751                         ret = regulator_set_voltage(mmc->supply.vqmmc,
1752                                         1700000, 1950000);
1753                         if (ret) {
1754                                 pr_warn("%s: Switching to 1.8V signalling voltage failed\n",
1755                                         mmc_hostname(mmc));
1756                                 return -EIO;
1757                         }
1758                 }
1759 
1760                 /*
1761                  * Enable 1.8V Signal Enable in the Host Control2
1762                  * register
1763                  */
1764                 ctrl |= SDHCI_CTRL_VDD_180;
1765                 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1766 
1767                 /* Some controller need to do more when switching */
1768                 if (host->ops->voltage_switch)
1769                         host->ops->voltage_switch(host);
1770 
1771                 /* 1.8V regulator output should be stable within 5 ms */
1772                 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1773                 if (ctrl & SDHCI_CTRL_VDD_180)
1774                         return 0;
1775 
1776                 pr_warn("%s: 1.8V regulator output did not became stable\n",
1777                         mmc_hostname(mmc));
1778 
1779                 return -EAGAIN;
1780         case MMC_SIGNAL_VOLTAGE_120:
1781                 if (!IS_ERR(mmc->supply.vqmmc)) {
1782                         ret = regulator_set_voltage(mmc->supply.vqmmc, 1100000,
1783                                                     1300000);
1784                         if (ret) {
1785                                 pr_warn("%s: Switching to 1.2V signalling voltage failed\n",
1786                                         mmc_hostname(mmc));
1787                                 return -EIO;
1788                         }
1789                 }
1790                 return 0;
1791         default:
1792                 /* No signal voltage switch required */
1793                 return 0;
1794         }
1795 }
1796 
1797 static int sdhci_start_signal_voltage_switch(struct mmc_host *mmc,
1798         struct mmc_ios *ios)
1799 {
1800         struct sdhci_host *host = mmc_priv(mmc);
1801         int err;
1802 
1803         if (host->version < SDHCI_SPEC_300)
1804                 return 0;
1805         sdhci_runtime_pm_get(host);
1806         err = sdhci_do_start_signal_voltage_switch(host, ios);
1807         sdhci_runtime_pm_put(host);
1808         return err;
1809 }
1810 
1811 static int sdhci_card_busy(struct mmc_host *mmc)
1812 {
1813         struct sdhci_host *host = mmc_priv(mmc);
1814         u32 present_state;
1815 
1816         sdhci_runtime_pm_get(host);
1817         /* Check whether DAT[3:0] is 0000 */
1818         present_state = sdhci_readl(host, SDHCI_PRESENT_STATE);
1819         sdhci_runtime_pm_put(host);
1820 
1821         return !(present_state & SDHCI_DATA_LVL_MASK);
1822 }
1823 
1824 static int sdhci_prepare_hs400_tuning(struct mmc_host *mmc, struct mmc_ios *ios)
1825 {
1826         struct sdhci_host *host = mmc_priv(mmc);
1827         unsigned long flags;
1828 
1829         spin_lock_irqsave(&host->lock, flags);
1830         host->flags |= SDHCI_HS400_TUNING;
1831         spin_unlock_irqrestore(&host->lock, flags);
1832 
1833         return 0;
1834 }
1835 
1836 static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
1837 {
1838         struct sdhci_host *host = mmc_priv(mmc);
1839         u16 ctrl;
1840         int tuning_loop_counter = MAX_TUNING_LOOP;
1841         int err = 0;
1842         unsigned long flags;
1843         unsigned int tuning_count = 0;
1844         bool hs400_tuning;
1845 
1846         sdhci_runtime_pm_get(host);
1847         spin_lock_irqsave(&host->lock, flags);
1848 
1849         hs400_tuning = host->flags & SDHCI_HS400_TUNING;
1850         host->flags &= ~SDHCI_HS400_TUNING;
1851 
1852         if (host->tuning_mode == SDHCI_TUNING_MODE_1)
1853                 tuning_count = host->tuning_count;
1854 
1855         /*
1856          * The Host Controller needs tuning in case of SDR104 and DDR50
1857          * mode, and for SDR50 mode when Use Tuning for SDR50 is set in
1858          * the Capabilities register.
1859          * If the Host Controller supports the HS200 mode then the
1860          * tuning function has to be executed.
1861          */
1862         switch (host->timing) {
1863         /* HS400 tuning is done in HS200 mode */
1864         case MMC_TIMING_MMC_HS400:
1865                 err = -EINVAL;
1866                 goto out_unlock;
1867 
1868         case MMC_TIMING_MMC_HS200:
1869                 /*
1870                  * Periodic re-tuning for HS400 is not expected to be needed, so
1871                  * disable it here.
1872                  */
1873                 if (hs400_tuning)
1874                         tuning_count = 0;
1875                 break;
1876 
1877         case MMC_TIMING_UHS_SDR104:
1878         case MMC_TIMING_UHS_DDR50:
1879                 break;
1880 
1881         case MMC_TIMING_UHS_SDR50:
1882                 if (host->flags & SDHCI_SDR50_NEEDS_TUNING ||
1883                     host->flags & SDHCI_SDR104_NEEDS_TUNING)
1884                         break;
1885                 /* FALLTHROUGH */
1886 
1887         default:
1888                 goto out_unlock;
1889         }
1890 
1891         if (host->ops->platform_execute_tuning) {
1892                 spin_unlock_irqrestore(&host->lock, flags);
1893                 err = host->ops->platform_execute_tuning(host, opcode);
1894                 sdhci_runtime_pm_put(host);
1895                 return err;
1896         }
1897 
1898         ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1899         ctrl |= SDHCI_CTRL_EXEC_TUNING;
1900         if (host->quirks2 & SDHCI_QUIRK2_TUNING_WORK_AROUND)
1901                 ctrl |= SDHCI_CTRL_TUNED_CLK;
1902         sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1903 
1904         /*
1905          * As per the Host Controller spec v3.00, tuning command
1906          * generates Buffer Read Ready interrupt, so enable that.
1907          *
1908          * Note: The spec clearly says that when tuning sequence
1909          * is being performed, the controller does not generate
1910          * interrupts other than Buffer Read Ready interrupt. But
1911          * to make sure we don't hit a controller bug, we _only_
1912          * enable Buffer Read Ready interrupt here.
1913          */
1914         sdhci_writel(host, SDHCI_INT_DATA_AVAIL, SDHCI_INT_ENABLE);
1915         sdhci_writel(host, SDHCI_INT_DATA_AVAIL, SDHCI_SIGNAL_ENABLE);
1916 
1917         /*
1918          * Issue CMD19 repeatedly till Execute Tuning is set to 0 or the number
1919          * of loops reaches 40 times or a timeout of 150ms occurs.
1920          */
1921         do {
1922                 struct mmc_command cmd = {0};
1923                 struct mmc_request mrq = {NULL};
1924 
1925                 cmd.opcode = opcode;
1926                 cmd.arg = 0;
1927                 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
1928                 cmd.retries = 0;
1929                 cmd.data = NULL;
1930                 cmd.error = 0;
1931 
1932                 if (tuning_loop_counter-- == 0)
1933                         break;
1934 
1935                 mrq.cmd = &cmd;
1936                 host->mrq = &mrq;
1937 
1938                 /*
1939                  * In response to CMD19, the card sends 64 bytes of tuning
1940                  * block to the Host Controller. So we set the block size
1941                  * to 64 here.
1942                  */
1943                 if (cmd.opcode == MMC_SEND_TUNING_BLOCK_HS200) {
1944                         if (mmc->ios.bus_width == MMC_BUS_WIDTH_8)
1945                                 sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, 128),
1946                                              SDHCI_BLOCK_SIZE);
1947                         else if (mmc->ios.bus_width == MMC_BUS_WIDTH_4)
1948                                 sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, 64),
1949                                              SDHCI_BLOCK_SIZE);
1950                 } else {
1951                         sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, 64),
1952                                      SDHCI_BLOCK_SIZE);
1953                 }
1954 
1955                 /*
1956                  * The tuning block is sent by the card to the host controller.
1957                  * So we set the TRNS_READ bit in the Transfer Mode register.
1958                  * This also takes care of setting DMA Enable and Multi Block
1959                  * Select in the same register to 0.
1960                  */
1961                 sdhci_writew(host, SDHCI_TRNS_READ, SDHCI_TRANSFER_MODE);
1962 
1963                 sdhci_send_command(host, &cmd);
1964 
1965                 host->cmd = NULL;
1966                 host->mrq = NULL;
1967 
1968                 spin_unlock_irqrestore(&host->lock, flags);
1969                 /* Wait for Buffer Read Ready interrupt */
1970                 wait_event_interruptible_timeout(host->buf_ready_int,
1971                                         (host->tuning_done == 1),
1972                                         msecs_to_jiffies(50));
1973                 spin_lock_irqsave(&host->lock, flags);
1974 
1975                 if (!host->tuning_done) {
1976                         pr_info(DRIVER_NAME ": Timeout waiting for Buffer Read Ready interrupt during tuning procedure, falling back to fixed sampling clock\n");
1977                         ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1978                         ctrl &= ~SDHCI_CTRL_TUNED_CLK;
1979                         ctrl &= ~SDHCI_CTRL_EXEC_TUNING;
1980                         sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1981 
1982                         err = -EIO;
1983                         goto out;
1984                 }
1985 
1986                 host->tuning_done = 0;
1987 
1988                 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1989 
1990                 /* eMMC spec does not require a delay between tuning cycles */
1991                 if (opcode == MMC_SEND_TUNING_BLOCK)
1992                         mdelay(1);
1993         } while (ctrl & SDHCI_CTRL_EXEC_TUNING);
1994 
1995         /*
1996          * The Host Driver has exhausted the maximum number of loops allowed,
1997          * so use fixed sampling frequency.
1998          */
1999         if (tuning_loop_counter < 0) {
2000                 ctrl &= ~SDHCI_CTRL_TUNED_CLK;
2001                 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2002         }
2003         if (!(ctrl & SDHCI_CTRL_TUNED_CLK)) {
2004                 pr_info(DRIVER_NAME ": Tuning procedure failed, falling back to fixed sampling clock\n");
2005                 err = -EIO;
2006         }
2007 
2008 out:
2009         if (tuning_count) {
2010                 /*
2011                  * In case tuning fails, host controllers which support
2012                  * re-tuning can try tuning again at a later time, when the
2013                  * re-tuning timer expires.  So for these controllers, we
2014                  * return 0. Since there might be other controllers who do not
2015                  * have this capability, we return error for them.
2016                  */
2017                 err = 0;
2018         }
2019 
2020         host->mmc->retune_period = err ? 0 : tuning_count;
2021 
2022         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
2023         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
2024 out_unlock:
2025         spin_unlock_irqrestore(&host->lock, flags);
2026         sdhci_runtime_pm_put(host);
2027 
2028         return err;
2029 }
2030 
2031 static int sdhci_select_drive_strength(struct mmc_card *card,
2032                                        unsigned int max_dtr, int host_drv,
2033                                        int card_drv, int *drv_type)
2034 {
2035         struct sdhci_host *host = mmc_priv(card->host);
2036 
2037         if (!host->ops->select_drive_strength)
2038                 return 0;
2039 
2040         return host->ops->select_drive_strength(host, card, max_dtr, host_drv,
2041                                                 card_drv, drv_type);
2042 }
2043 
2044 static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable)
2045 {
2046         /* Host Controller v3.00 defines preset value registers */
2047         if (host->version < SDHCI_SPEC_300)
2048                 return;
2049 
2050         /*
2051          * We only enable or disable Preset Value if they are not already
2052          * enabled or disabled respectively. Otherwise, we bail out.
2053          */
2054         if (host->preset_enabled != enable) {
2055                 u16 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2056 
2057                 if (enable)
2058                         ctrl |= SDHCI_CTRL_PRESET_VAL_ENABLE;
2059                 else
2060                         ctrl &= ~SDHCI_CTRL_PRESET_VAL_ENABLE;
2061 
2062                 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2063 
2064                 if (enable)
2065                         host->flags |= SDHCI_PV_ENABLED;
2066                 else
2067                         host->flags &= ~SDHCI_PV_ENABLED;
2068 
2069                 host->preset_enabled = enable;
2070         }
2071 }
2072 
2073 static void sdhci_post_req(struct mmc_host *mmc, struct mmc_request *mrq,
2074                                 int err)
2075 {
2076         struct sdhci_host *host = mmc_priv(mmc);
2077         struct mmc_data *data = mrq->data;
2078 
2079         if (data->host_cookie != COOKIE_UNMAPPED)
2080                 dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
2081                              data->flags & MMC_DATA_WRITE ?
2082                                DMA_TO_DEVICE : DMA_FROM_DEVICE);
2083 
2084         data->host_cookie = COOKIE_UNMAPPED;
2085 }
2086 
2087 static void sdhci_pre_req(struct mmc_host *mmc, struct mmc_request *mrq,
2088                                bool is_first_req)
2089 {
2090         struct sdhci_host *host = mmc_priv(mmc);
2091 
2092         mrq->data->host_cookie = COOKIE_UNMAPPED;
2093 
2094         if (host->flags & SDHCI_REQ_USE_DMA)
2095                 sdhci_pre_dma_transfer(host, mrq->data, COOKIE_PRE_MAPPED);
2096 }
2097 
2098 static void sdhci_card_event(struct mmc_host *mmc)
2099 {
2100         struct sdhci_host *host = mmc_priv(mmc);
2101         unsigned long flags;
2102         int present;
2103 
2104         /* First check if client has provided their own card event */
2105         if (host->ops->card_event)
2106                 host->ops->card_event(host);
2107 
2108         present = sdhci_do_get_cd(host);
2109 
2110         spin_lock_irqsave(&host->lock, flags);
2111 
2112         /* Check host->mrq first in case we are runtime suspended */
2113         if (host->mrq && !present) {
2114                 pr_err("%s: Card removed during transfer!\n",
2115                         mmc_hostname(host->mmc));
2116                 pr_err("%s: Resetting controller.\n",
2117                         mmc_hostname(host->mmc));
2118 
2119                 sdhci_do_reset(host, SDHCI_RESET_CMD);
2120                 sdhci_do_reset(host, SDHCI_RESET_DATA);
2121 
2122                 host->mrq->cmd->error = -ENOMEDIUM;
2123                 tasklet_schedule(&host->finish_tasklet);
2124         }
2125 
2126         spin_unlock_irqrestore(&host->lock, flags);
2127 }
2128 
2129 static const struct mmc_host_ops sdhci_ops = {
2130         .request        = sdhci_request,
2131         .post_req       = sdhci_post_req,
2132         .pre_req        = sdhci_pre_req,
2133         .set_ios        = sdhci_set_ios,
2134         .get_cd         = sdhci_get_cd,
2135         .get_ro         = sdhci_get_ro,
2136         .hw_reset       = sdhci_hw_reset,
2137         .enable_sdio_irq = sdhci_enable_sdio_irq,
2138         .start_signal_voltage_switch    = sdhci_start_signal_voltage_switch,
2139         .prepare_hs400_tuning           = sdhci_prepare_hs400_tuning,
2140         .execute_tuning                 = sdhci_execute_tuning,
2141         .select_drive_strength          = sdhci_select_drive_strength,
2142         .card_event                     = sdhci_card_event,
2143         .card_busy      = sdhci_card_busy,
2144 };
2145 
2146 /*****************************************************************************\
2147  *                                                                           *
2148  * Tasklets                                                                  *
2149  *                                                                           *
2150 \*****************************************************************************/
2151 
2152 static void sdhci_tasklet_finish(unsigned long param)
2153 {
2154         struct sdhci_host *host;
2155         unsigned long flags;
2156         struct mmc_request *mrq;
2157 
2158         host = (struct sdhci_host*)param;
2159 
2160         spin_lock_irqsave(&host->lock, flags);
2161 
2162         /*
2163          * If this tasklet gets rescheduled while running, it will
2164          * be run again afterwards but without any active request.
2165          */
2166         if (!host->mrq) {
2167                 spin_unlock_irqrestore(&host->lock, flags);
2168                 return;
2169         }
2170 
2171         del_timer(&host->timer);
2172 
2173         mrq = host->mrq;
2174 
2175         /*
2176          * Always unmap the data buffers if they were mapped by
2177          * sdhci_prepare_data() whenever we finish with a request.
2178          * This avoids leaking DMA mappings on error.
2179          */
2180         if (host->flags & SDHCI_REQ_USE_DMA) {
2181                 struct mmc_data *data = mrq->data;
2182 
2183                 if (data && data->host_cookie == COOKIE_MAPPED) {
2184                         dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
2185                                      (data->flags & MMC_DATA_READ) ?
2186                                      DMA_FROM_DEVICE : DMA_TO_DEVICE);
2187                         data->host_cookie = COOKIE_UNMAPPED;
2188                 }
2189         }
2190 
2191         /*
2192          * The controller needs a reset of internal state machines
2193          * upon error conditions.
2194          */
2195         if (!(host->flags & SDHCI_DEVICE_DEAD) &&
2196             ((mrq->cmd && mrq->cmd->error) ||
2197              (mrq->sbc && mrq->sbc->error) ||
2198              (mrq->data && ((mrq->data->error && !mrq->data->stop) ||
2199                             (mrq->data->stop && mrq->data->stop->error))) ||
2200              (host->quirks & SDHCI_QUIRK_RESET_AFTER_REQUEST))) {
2201 
2202                 /* Some controllers need this kick or reset won't work here */
2203                 if (host->quirks & SDHCI_QUIRK_CLOCK_BEFORE_RESET)
2204                         /* This is to force an update */
2205                         host->ops->set_clock(host, host->clock);
2206 
2207                 /* Spec says we should do both at the same time, but Ricoh
2208                    controllers do not like that. */
2209                 sdhci_do_reset(host, SDHCI_RESET_CMD);
2210                 sdhci_do_reset(host, SDHCI_RESET_DATA);
2211         }
2212 
2213         host->mrq = NULL;
2214         host->cmd = NULL;
2215         host->data = NULL;
2216 
2217 #ifndef SDHCI_USE_LEDS_CLASS
2218         sdhci_deactivate_led(host);
2219 #endif
2220 
2221         mmiowb();
2222         spin_unlock_irqrestore(&host->lock, flags);
2223 
2224         mmc_request_done(host->mmc, mrq);
2225         sdhci_runtime_pm_put(host);
2226 }
2227 
2228 static void sdhci_timeout_timer(unsigned long data)
2229 {
2230         struct sdhci_host *host;
2231         unsigned long flags;
2232 
2233         host = (struct sdhci_host*)data;
2234 
2235         spin_lock_irqsave(&host->lock, flags);
2236 
2237         if (host->mrq) {
2238                 pr_err("%s: Timeout waiting for hardware interrupt.\n",
2239                        mmc_hostname(host->mmc));
2240                 sdhci_dumpregs(host);
2241 
2242                 if (host->data) {
2243                         host->data->error = -ETIMEDOUT;
2244                         sdhci_finish_data(host);
2245                 } else {
2246                         if (host->cmd)
2247                                 host->cmd->error = -ETIMEDOUT;
2248                         else
2249                                 host->mrq->cmd->error = -ETIMEDOUT;
2250 
2251                         tasklet_schedule(&host->finish_tasklet);
2252                 }
2253         }
2254 
2255         mmiowb();
2256         spin_unlock_irqrestore(&host->lock, flags);
2257 }
2258 
2259 /*****************************************************************************\
2260  *                                                                           *
2261  * Interrupt handling                                                        *
2262  *                                                                           *
2263 \*****************************************************************************/
2264 
2265 static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask, u32 *mask)
2266 {
2267         BUG_ON(intmask == 0);
2268 
2269         if (!host->cmd) {
2270                 pr_err("%s: Got command interrupt 0x%08x even though no command operation was in progress.\n",
2271                        mmc_hostname(host->mmc), (unsigned)intmask);
2272                 sdhci_dumpregs(host);
2273                 return;
2274         }
2275 
2276         if (intmask & (SDHCI_INT_TIMEOUT | SDHCI_INT_CRC |
2277                        SDHCI_INT_END_BIT | SDHCI_INT_INDEX)) {
2278                 if (intmask & SDHCI_INT_TIMEOUT)
2279                         host->cmd->error = -ETIMEDOUT;
2280                 else
2281                         host->cmd->error = -EILSEQ;
2282 
2283                 /*
2284                  * If this command initiates a data phase and a response
2285                  * CRC error is signalled, the card can start transferring
2286                  * data - the card may have received the command without
2287                  * error.  We must not terminate the mmc_request early.
2288                  *
2289                  * If the card did not receive the command or returned an
2290                  * error which prevented it sending data, the data phase
2291                  * will time out.
2292                  */
2293                 if (host->cmd->data &&
2294                     (intmask & (SDHCI_INT_CRC | SDHCI_INT_TIMEOUT)) ==
2295                      SDHCI_INT_CRC) {
2296                         host->cmd = NULL;
2297                         return;
2298                 }
2299 
2300                 tasklet_schedule(&host->finish_tasklet);
2301                 return;
2302         }
2303 
2304         /*
2305          * The host can send and interrupt when the busy state has
2306          * ended, allowing us to wait without wasting CPU cycles.
2307          * Unfortunately this is overloaded on the "data complete"
2308          * interrupt, so we need to take some care when handling
2309          * it.
2310          *
2311          * Note: The 1.0 specification is a bit ambiguous about this
2312          *       feature so there might be some problems with older
2313          *       controllers.
2314          */
2315         if (host->cmd->flags & MMC_RSP_BUSY) {
2316                 if (host->cmd->data)
2317                         DBG("Cannot wait for busy signal when also doing a data transfer");
2318                 else if (!(host->quirks & SDHCI_QUIRK_NO_BUSY_IRQ)
2319                                 && !host->busy_handle) {
2320                         /* Mark that command complete before busy is ended */
2321                         host->busy_handle = 1;
2322                         return;
2323                 }
2324 
2325                 /* The controller does not support the end-of-busy IRQ,
2326                  * fall through and take the SDHCI_INT_RESPONSE */
2327         } else if ((host->quirks2 & SDHCI_QUIRK2_STOP_WITH_TC) &&
2328                    host->cmd->opcode == MMC_STOP_TRANSMISSION && !host->data) {
2329                 *mask &= ~SDHCI_INT_DATA_END;
2330         }
2331 
2332         if (intmask & SDHCI_INT_RESPONSE)
2333                 sdhci_finish_command(host);
2334 }
2335 
2336 #ifdef CONFIG_MMC_DEBUG
2337 static void sdhci_adma_show_error(struct sdhci_host *host)
2338 {
2339         const char *name = mmc_hostname(host->mmc);
2340         void *desc = host->adma_table;
2341 
2342         sdhci_dumpregs(host);
2343 
2344         while (true) {
2345                 struct sdhci_adma2_64_desc *dma_desc = desc;
2346 
2347                 if (host->flags & SDHCI_USE_64_BIT_DMA)
2348                         DBG("%s: %p: DMA 0x%08x%08x, LEN 0x%04x, Attr=0x%02x\n",
2349                             name, desc, le32_to_cpu(dma_desc->addr_hi),
2350                             le32_to_cpu(dma_desc->addr_lo),
2351                             le16_to_cpu(dma_desc->len),
2352                             le16_to_cpu(dma_desc->cmd));
2353                 else
2354                         DBG("%s: %p: DMA 0x%08x, LEN 0x%04x, Attr=0x%02x\n",
2355                             name, desc, le32_to_cpu(dma_desc->addr_lo),
2356                             le16_to_cpu(dma_desc->len),
2357                             le16_to_cpu(dma_desc->cmd));
2358 
2359                 desc += host->desc_sz;
2360 
2361                 if (dma_desc->cmd & cpu_to_le16(ADMA2_END))
2362                         break;
2363         }
2364 }
2365 #else
2366 static void sdhci_adma_show_error(struct sdhci_host *host) { }
2367 #endif
2368 
2369 static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
2370 {
2371         u32 command;
2372         BUG_ON(intmask == 0);
2373 
2374         /* CMD19 generates _only_ Buffer Read Ready interrupt */
2375         if (intmask & SDHCI_INT_DATA_AVAIL) {
2376                 command = SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND));
2377                 if (command == MMC_SEND_TUNING_BLOCK ||
2378                     command == MMC_SEND_TUNING_BLOCK_HS200) {
2379                         host->tuning_done = 1;
2380                         wake_up(&host->buf_ready_int);
2381                         return;
2382                 }
2383         }
2384 
2385         if (!host->data) {
2386                 /*
2387                  * The "data complete" interrupt is also used to
2388                  * indicate that a busy state has ended. See comment
2389                  * above in sdhci_cmd_irq().
2390                  */
2391                 if (host->cmd && (host->cmd->flags & MMC_RSP_BUSY)) {
2392                         if (intmask & SDHCI_INT_DATA_TIMEOUT) {
2393                                 host->cmd->error = -ETIMEDOUT;
2394                                 tasklet_schedule(&host->finish_tasklet);
2395                                 return;
2396                         }
2397                         if (intmask & SDHCI_INT_DATA_END) {
2398                                 /*
2399                                  * Some cards handle busy-end interrupt
2400                                  * before the command completed, so make
2401                                  * sure we do things in the proper order.
2402                                  */
2403                                 if (host->busy_handle)
2404                                         sdhci_finish_command(host);
2405                                 else
2406                                         host->busy_handle = 1;
2407                                 return;
2408                         }
2409                 }
2410 
2411                 pr_err("%s: Got data interrupt 0x%08x even though no data operation was in progress.\n",
2412                        mmc_hostname(host->mmc), (unsigned)intmask);
2413                 sdhci_dumpregs(host);
2414 
2415                 return;
2416         }
2417 
2418         if (intmask & SDHCI_INT_DATA_TIMEOUT)
2419                 host->data->error = -ETIMEDOUT;
2420         else if (intmask & SDHCI_INT_DATA_END_BIT)
2421                 host->data->error = -EILSEQ;
2422         else if ((intmask & SDHCI_INT_DATA_CRC) &&
2423                 SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND))
2424                         != MMC_BUS_TEST_R)
2425                 host->data->error = -EILSEQ;
2426         else if (intmask & SDHCI_INT_ADMA_ERROR) {
2427                 pr_err("%s: ADMA error\n", mmc_hostname(host->mmc));
2428                 sdhci_adma_show_error(host);
2429                 host->data->error = -EIO;
2430                 if (host->ops->adma_workaround)
2431                         host->ops->adma_workaround(host, intmask);
2432         }
2433 
2434         if (host->data->error)
2435                 sdhci_finish_data(host);
2436         else {
2437                 if (intmask & (SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL))
2438                         sdhci_transfer_pio(host);
2439 
2440                 /*
2441                  * We currently don't do anything fancy with DMA
2442                  * boundaries, but as we can't disable the feature
2443                  * we need to at least restart the transfer.
2444                  *
2445                  * According to the spec sdhci_readl(host, SDHCI_DMA_ADDRESS)
2446                  * should return a valid address to continue from, but as
2447                  * some controllers are faulty, don't trust them.
2448                  */
2449                 if (intmask & SDHCI_INT_DMA_END) {
2450                         u32 dmastart, dmanow;
2451                         dmastart = sg_dma_address(host->data->sg);
2452                         dmanow = dmastart + host->data->bytes_xfered;
2453                         /*
2454                          * Force update to the next DMA block boundary.
2455                          */
2456                         dmanow = (dmanow &
2457                                 ~(SDHCI_DEFAULT_BOUNDARY_SIZE - 1)) +
2458                                 SDHCI_DEFAULT_BOUNDARY_SIZE;
2459                         host->data->bytes_xfered = dmanow - dmastart;
2460                         DBG("%s: DMA base 0x%08x, transferred 0x%06x bytes,"
2461                                 " next 0x%08x\n",
2462                                 mmc_hostname(host->mmc), dmastart,
2463                                 host->data->bytes_xfered, dmanow);
2464                         sdhci_writel(host, dmanow, SDHCI_DMA_ADDRESS);
2465                 }
2466 
2467                 if (intmask & SDHCI_INT_DATA_END) {
2468                         if (host->cmd) {
2469                                 /*
2470                                  * Data managed to finish before the
2471                                  * command completed. Make sure we do
2472                                  * things in the proper order.
2473                                  */
2474                                 host->data_early = 1;
2475                         } else {
2476                                 sdhci_finish_data(host);
2477                         }
2478                 }
2479         }
2480 }
2481 
2482 static irqreturn_t sdhci_irq(int irq, void *dev_id)
2483 {
2484         irqreturn_t result = IRQ_NONE;
2485         struct sdhci_host *host = dev_id;
2486         u32 intmask, mask, unexpected = 0;
2487         int max_loops = 16;
2488 
2489         spin_lock(&host->lock);
2490 
2491         if (host->runtime_suspended && !sdhci_sdio_irq_enabled(host)) {
2492                 spin_unlock(&host->lock);
2493                 return IRQ_NONE;
2494         }
2495 
2496         intmask = sdhci_readl(host, SDHCI_INT_STATUS);
2497         if (!intmask || intmask == 0xffffffff) {
2498                 result = IRQ_NONE;
2499                 goto out;
2500         }
2501 
2502         do {
2503                 /* Clear selected interrupts. */
2504                 mask = intmask & (SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK |
2505                                   SDHCI_INT_BUS_POWER);
2506                 sdhci_writel(host, mask, SDHCI_INT_STATUS);
2507 
2508                 DBG("*** %s got interrupt: 0x%08x\n",
2509                         mmc_hostname(host->mmc), intmask);
2510 
2511                 if (intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
2512                         u32 present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
2513                                       SDHCI_CARD_PRESENT;
2514 
2515                         /*
2516                          * There is a observation on i.mx esdhc.  INSERT
2517                          * bit will be immediately set again when it gets
2518                          * cleared, if a card is inserted.  We have to mask
2519                          * the irq to prevent interrupt storm which will
2520                          * freeze the system.  And the REMOVE gets the
2521                          * same situation.
2522                          *
2523                          * More testing are needed here to ensure it works
2524                          * for other platforms though.
2525                          */
2526                         host->ier &= ~(SDHCI_INT_CARD_INSERT |
2527                                        SDHCI_INT_CARD_REMOVE);
2528                         host->ier |= present ? SDHCI_INT_CARD_REMOVE :
2529                                                SDHCI_INT_CARD_INSERT;
2530                         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
2531                         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
2532 
2533                         sdhci_writel(host, intmask & (SDHCI_INT_CARD_INSERT |
2534                                      SDHCI_INT_CARD_REMOVE), SDHCI_INT_STATUS);
2535 
2536                         host->thread_isr |= intmask & (SDHCI_INT_CARD_INSERT |
2537                                                        SDHCI_INT_CARD_REMOVE);
2538                         result = IRQ_WAKE_THREAD;
2539                 }
2540 
2541                 if (intmask & SDHCI_INT_CMD_MASK)
2542                         sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK,
2543                                       &intmask);
2544 
2545                 if (intmask & SDHCI_INT_DATA_MASK)
2546                         sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK);
2547 
2548                 if (intmask & SDHCI_INT_BUS_POWER)
2549                         pr_err("%s: Card is consuming too much power!\n",
2550                                 mmc_hostname(host->mmc));
2551 
2552                 if (intmask & SDHCI_INT_CARD_INT) {
2553                         sdhci_enable_sdio_irq_nolock(host, false);
2554                         host->thread_isr |= SDHCI_INT_CARD_INT;
2555                         result = IRQ_WAKE_THREAD;
2556                 }
2557 
2558                 intmask &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE |
2559                              SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK |
2560                              SDHCI_INT_ERROR | SDHCI_INT_BUS_POWER |
2561                              SDHCI_INT_CARD_INT);
2562 
2563                 if (intmask) {
2564                         unexpected |= intmask;
2565                         sdhci_writel(host, intmask, SDHCI_INT_STATUS);
2566                 }
2567 
2568                 if (result == IRQ_NONE)
2569                         result = IRQ_HANDLED;
2570 
2571                 intmask = sdhci_readl(host, SDHCI_INT_STATUS);
2572         } while (intmask && --max_loops);
2573 out:
2574         spin_unlock(&host->lock);
2575 
2576         if (unexpected) {
2577                 pr_err("%s: Unexpected interrupt 0x%08x.\n",
2578                            mmc_hostname(host->mmc), unexpected);
2579                 sdhci_dumpregs(host);
2580         }
2581 
2582         return result;
2583 }
2584 
2585 static irqreturn_t sdhci_thread_irq(int irq, void *dev_id)
2586 {
2587         struct sdhci_host *host = dev_id;
2588         unsigned long flags;
2589         u32 isr;
2590 
2591         spin_lock_irqsave(&host->lock, flags);
2592         isr = host->thread_isr;
2593         host->thread_isr = 0;
2594         spin_unlock_irqrestore(&host->lock, flags);
2595 
2596         if (isr & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
2597                 sdhci_card_event(host->mmc);
2598                 mmc_detect_change(host->mmc, msecs_to_jiffies(200));
2599         }
2600 
2601         if (isr & SDHCI_INT_CARD_INT) {
2602                 sdio_run_irqs(host->mmc);
2603 
2604                 spin_lock_irqsave(&host->lock, flags);
2605                 if (host->flags & SDHCI_SDIO_IRQ_ENABLED)
2606                         sdhci_enable_sdio_irq_nolock(host, true);
2607                 spin_unlock_irqrestore(&host->lock, flags);
2608         }
2609 
2610         return isr ? IRQ_HANDLED : IRQ_NONE;
2611 }
2612 
2613 /*****************************************************************************\
2614  *                                                                           *
2615  * Suspend/resume                                                            *
2616  *                                                                           *
2617 \*****************************************************************************/
2618 
2619 #ifdef CONFIG_PM
2620 void sdhci_enable_irq_wakeups(struct sdhci_host *host)
2621 {
2622         u8 val;
2623         u8 mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE
2624                         | SDHCI_WAKE_ON_INT;
2625 
2626         val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
2627         val |= mask ;
2628         /* Avoid fake wake up */
2629         if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
2630                 val &= ~(SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE);
2631         sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
2632 }
2633 EXPORT_SYMBOL_GPL(sdhci_enable_irq_wakeups);
2634 
2635 static void sdhci_disable_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         sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
2644 }
2645 
2646 int sdhci_suspend_host(struct sdhci_host *host)
2647 {
2648         sdhci_disable_card_detection(host);
2649 
2650         mmc_retune_timer_stop(host->mmc);
2651         mmc_retune_needed(host->mmc);
2652 
2653         if (!device_may_wakeup(mmc_dev(host->mmc))) {
2654                 host->ier = 0;
2655                 sdhci_writel(host, 0, SDHCI_INT_ENABLE);
2656                 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
2657                 free_irq(host->irq, host);
2658         } else {
2659                 sdhci_enable_irq_wakeups(host);
2660                 enable_irq_wake(host->irq);
2661         }
2662         return 0;
2663 }
2664 
2665 EXPORT_SYMBOL_GPL(sdhci_suspend_host);
2666 
2667 int sdhci_resume_host(struct sdhci_host *host)
2668 {
2669         int ret = 0;
2670 
2671         if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
2672                 if (host->ops->enable_dma)
2673                         host->ops->enable_dma(host);
2674         }
2675 
2676         if ((host->mmc->pm_flags & MMC_PM_KEEP_POWER) &&
2677             (host->quirks2 & SDHCI_QUIRK2_HOST_OFF_CARD_ON)) {
2678                 /* Card keeps power but host controller does not */
2679                 sdhci_init(host, 0);
2680                 host->pwr = 0;
2681                 host->clock = 0;
2682                 sdhci_do_set_ios(host, &host->mmc->ios);
2683         } else {
2684                 sdhci_init(host, (host->mmc->pm_flags & MMC_PM_KEEP_POWER));
2685                 mmiowb();
2686         }
2687 
2688         if (!device_may_wakeup(mmc_dev(host->mmc))) {
2689                 ret = request_threaded_irq(host->irq, sdhci_irq,
2690                                            sdhci_thread_irq, IRQF_SHARED,
2691                                            mmc_hostname(host->mmc), host);
2692                 if (ret)
2693                         return ret;
2694         } else {
2695                 sdhci_disable_irq_wakeups(host);
2696                 disable_irq_wake(host->irq);
2697         }
2698 
2699         sdhci_enable_card_detection(host);
2700 
2701         return ret;
2702 }
2703 
2704 EXPORT_SYMBOL_GPL(sdhci_resume_host);
2705 
2706 static int sdhci_runtime_pm_get(struct sdhci_host *host)
2707 {
2708         return pm_runtime_get_sync(host->mmc->parent);
2709 }
2710 
2711 static int sdhci_runtime_pm_put(struct sdhci_host *host)
2712 {
2713         pm_runtime_mark_last_busy(host->mmc->parent);
2714         return pm_runtime_put_autosuspend(host->mmc->parent);
2715 }
2716 
2717 static void sdhci_runtime_pm_bus_on(struct sdhci_host *host)
2718 {
2719         if (host->bus_on)
2720                 return;
2721         host->bus_on = true;
2722         pm_runtime_get_noresume(host->mmc->parent);
2723 }
2724 
2725 static void sdhci_runtime_pm_bus_off(struct sdhci_host *host)
2726 {
2727         if (!host->bus_on)
2728                 return;
2729         host->bus_on = false;
2730         pm_runtime_put_noidle(host->mmc->parent);
2731 }
2732 
2733 int sdhci_runtime_suspend_host(struct sdhci_host *host)
2734 {
2735         unsigned long flags;
2736 
2737         mmc_retune_timer_stop(host->mmc);
2738         mmc_retune_needed(host->mmc);
2739 
2740         spin_lock_irqsave(&host->lock, flags);
2741         host->ier &= SDHCI_INT_CARD_INT;
2742         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
2743         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
2744         spin_unlock_irqrestore(&host->lock, flags);
2745 
2746         synchronize_hardirq(host->irq);
2747 
2748         spin_lock_irqsave(&host->lock, flags);
2749         host->runtime_suspended = true;
2750         spin_unlock_irqrestore(&host->lock, flags);
2751 
2752         return 0;
2753 }
2754 EXPORT_SYMBOL_GPL(sdhci_runtime_suspend_host);
2755 
2756 int sdhci_runtime_resume_host(struct sdhci_host *host)
2757 {
2758         unsigned long flags;
2759         int host_flags = host->flags;
2760 
2761         if (host_flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
2762                 if (host->ops->enable_dma)
2763                         host->ops->enable_dma(host);
2764         }
2765 
2766         sdhci_init(host, 0);
2767 
2768         /* Force clock and power re-program */
2769         host->pwr = 0;
2770         host->clock = 0;
2771         sdhci_do_start_signal_voltage_switch(host, &host->mmc->ios);
2772         sdhci_do_set_ios(host, &host->mmc->ios);
2773 
2774         if ((host_flags & SDHCI_PV_ENABLED) &&
2775                 !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN)) {
2776                 spin_lock_irqsave(&host->lock, flags);
2777                 sdhci_enable_preset_value(host, true);
2778                 spin_unlock_irqrestore(&host->lock, flags);
2779         }
2780 
2781         spin_lock_irqsave(&host->lock, flags);
2782 
2783         host->runtime_suspended = false;
2784 
2785         /* Enable SDIO IRQ */
2786         if (host->flags & SDHCI_SDIO_IRQ_ENABLED)
2787                 sdhci_enable_sdio_irq_nolock(host, true);
2788 
2789         /* Enable Card Detection */
2790         sdhci_enable_card_detection(host);
2791 
2792         spin_unlock_irqrestore(&host->lock, flags);
2793 
2794         return 0;
2795 }
2796 EXPORT_SYMBOL_GPL(sdhci_runtime_resume_host);
2797 
2798 #endif /* CONFIG_PM */
2799 
2800 /*****************************************************************************\
2801  *                                                                           *
2802  * Device allocation/registration                                            *
2803  *                                                                           *
2804 \*****************************************************************************/
2805 
2806 struct sdhci_host *sdhci_alloc_host(struct device *dev,
2807         size_t priv_size)
2808 {
2809         struct mmc_host *mmc;
2810         struct sdhci_host *host;
2811 
2812         WARN_ON(dev == NULL);
2813 
2814         mmc = mmc_alloc_host(sizeof(struct sdhci_host) + priv_size, dev);
2815         if (!mmc)
2816                 return ERR_PTR(-ENOMEM);
2817 
2818         host = mmc_priv(mmc);
2819         host->mmc = mmc;
2820         host->mmc_host_ops = sdhci_ops;
2821         mmc->ops = &host->mmc_host_ops;
2822 
2823         return host;
2824 }
2825 
2826 EXPORT_SYMBOL_GPL(sdhci_alloc_host);
2827 
2828 static int sdhci_set_dma_mask(struct sdhci_host *host)
2829 {
2830         struct mmc_host *mmc = host->mmc;
2831         struct device *dev = mmc_dev(mmc);
2832         int ret = -EINVAL;
2833 
2834         if (host->quirks2 & SDHCI_QUIRK2_BROKEN_64_BIT_DMA)
2835                 host->flags &= ~SDHCI_USE_64_BIT_DMA;
2836 
2837         /* Try 64-bit mask if hardware is capable  of it */
2838         if (host->flags & SDHCI_USE_64_BIT_DMA) {
2839                 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
2840                 if (ret) {
2841                         pr_warn("%s: Failed to set 64-bit DMA mask.\n",
2842                                 mmc_hostname(mmc));
2843                         host->flags &= ~SDHCI_USE_64_BIT_DMA;
2844                 }
2845         }
2846 
2847         /* 32-bit mask as default & fallback */
2848         if (ret) {
2849                 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
2850                 if (ret)
2851                         pr_warn("%s: Failed to set 32-bit DMA mask.\n",
2852                                 mmc_hostname(mmc));
2853         }
2854 
2855         return ret;
2856 }
2857 
2858 int sdhci_add_host(struct sdhci_host *host)
2859 {
2860         struct mmc_host *mmc;
2861         u32 caps[2] = {0, 0};
2862         u32 max_current_caps;
2863         unsigned int ocr_avail;
2864         unsigned int override_timeout_clk;
2865         u32 max_clk;
2866         int ret;
2867 
2868         WARN_ON(host == NULL);
2869         if (host == NULL)
2870                 return -EINVAL;
2871 
2872         mmc = host->mmc;
2873 
2874         if (debug_quirks)
2875                 host->quirks = debug_quirks;
2876         if (debug_quirks2)
2877                 host->quirks2 = debug_quirks2;
2878 
2879         override_timeout_clk = host->timeout_clk;
2880 
2881         sdhci_do_reset(host, SDHCI_RESET_ALL);
2882 
2883         host->version = sdhci_readw(host, SDHCI_HOST_VERSION);
2884         host->version = (host->version & SDHCI_SPEC_VER_MASK)
2885                                 >> SDHCI_SPEC_VER_SHIFT;
2886         if (host->version > SDHCI_SPEC_300) {
2887                 pr_err("%s: Unknown controller version (%d). You may experience problems.\n",
2888                        mmc_hostname(mmc), host->version);
2889         }
2890 
2891         caps[0] = (host->quirks & SDHCI_QUIRK_MISSING_CAPS) ? host->caps :
2892                 sdhci_readl(host, SDHCI_CAPABILITIES);
2893 
2894         if (host->version >= SDHCI_SPEC_300)
2895                 caps[1] = (host->quirks & SDHCI_QUIRK_MISSING_CAPS) ?
2896                         host->caps1 :
2897                         sdhci_readl(host, SDHCI_CAPABILITIES_1);
2898 
2899         if (host->quirks & SDHCI_QUIRK_FORCE_DMA)
2900                 host->flags |= SDHCI_USE_SDMA;
2901         else if (!(caps[0] & SDHCI_CAN_DO_SDMA))
2902                 DBG("Controller doesn't have SDMA capability\n");
2903         else
2904                 host->flags |= SDHCI_USE_SDMA;
2905 
2906         if ((host->quirks & SDHCI_QUIRK_BROKEN_DMA) &&
2907                 (host->flags & SDHCI_USE_SDMA)) {
2908                 DBG("Disabling DMA as it is marked broken\n");
2909                 host->flags &= ~SDHCI_USE_SDMA;
2910         }
2911 
2912         if ((host->version >= SDHCI_SPEC_200) &&
2913                 (caps[0] & SDHCI_CAN_DO_ADMA2))
2914                 host->flags |= SDHCI_USE_ADMA;
2915 
2916         if ((host->quirks & SDHCI_QUIRK_BROKEN_ADMA) &&
2917                 (host->flags & SDHCI_USE_ADMA)) {
2918                 DBG("Disabling ADMA as it is marked broken\n");
2919                 host->flags &= ~SDHCI_USE_ADMA;
2920         }
2921 
2922         /*
2923          * It is assumed that a 64-bit capable device has set a 64-bit DMA mask
2924          * and *must* do 64-bit DMA.  A driver has the opportunity to change
2925          * that during the first call to ->enable_dma().  Similarly
2926          * SDHCI_QUIRK2_BROKEN_64_BIT_DMA must be left to the drivers to
2927          * implement.
2928          */
2929         if (caps[0] & SDHCI_CAN_64BIT)
2930                 host->flags |= SDHCI_USE_64_BIT_DMA;
2931 
2932         if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
2933                 ret = sdhci_set_dma_mask(host);
2934 
2935                 if (!ret && host->ops->enable_dma)
2936                         ret = host->ops->enable_dma(host);
2937 
2938                 if (ret) {
2939                         pr_warn("%s: No suitable DMA available - falling back to PIO\n",
2940                                 mmc_hostname(mmc));
2941                         host->flags &= ~(SDHCI_USE_SDMA | SDHCI_USE_ADMA);
2942 
2943                         ret = 0;
2944                 }
2945         }
2946 
2947         /* SDMA does not support 64-bit DMA */
2948         if (host->flags & SDHCI_USE_64_BIT_DMA)
2949                 host->flags &= ~SDHCI_USE_SDMA;
2950 
2951         if (host->flags & SDHCI_USE_ADMA) {
2952                 dma_addr_t dma;
2953                 void *buf;
2954 
2955                 /*
2956                  * The DMA descriptor table size is calculated as the maximum
2957                  * number of segments times 2, to allow for an alignment
2958                  * descriptor for each segment, plus 1 for a nop end descriptor,
2959                  * all multipled by the descriptor size.
2960                  */
2961                 if (host->flags & SDHCI_USE_64_BIT_DMA) {
2962                         host->adma_table_sz = (SDHCI_MAX_SEGS * 2 + 1) *
2963                                               SDHCI_ADMA2_64_DESC_SZ;
2964                         host->desc_sz = SDHCI_ADMA2_64_DESC_SZ;
2965                 } else {
2966                         host->adma_table_sz = (SDHCI_MAX_SEGS * 2 + 1) *
2967                                               SDHCI_ADMA2_32_DESC_SZ;
2968                         host->desc_sz = SDHCI_ADMA2_32_DESC_SZ;
2969                 }
2970 
2971                 host->align_buffer_sz = SDHCI_MAX_SEGS * SDHCI_ADMA2_ALIGN;
2972                 buf = dma_alloc_coherent(mmc_dev(mmc), host->align_buffer_sz +
2973                                          host->adma_table_sz, &dma, GFP_KERNEL);
2974                 if (!buf) {
2975                         pr_warn("%s: Unable to allocate ADMA buffers - falling back to standard DMA\n",
2976                                 mmc_hostname(mmc));
2977                         host->flags &= ~SDHCI_USE_ADMA;
2978                 } else if ((dma + host->align_buffer_sz) &
2979                            (SDHCI_ADMA2_DESC_ALIGN - 1)) {
2980                         pr_warn("%s: unable to allocate aligned ADMA descriptor\n",
2981                                 mmc_hostname(mmc));
2982                         host->flags &= ~SDHCI_USE_ADMA;
2983                         dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz +
2984                                           host->adma_table_sz, buf, dma);
2985                 } else {
2986                         host->align_buffer = buf;
2987                         host->align_addr = dma;
2988 
2989                         host->adma_table = buf + host->align_buffer_sz;
2990                         host->adma_addr = dma + host->align_buffer_sz;
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 frequency.\n",
3016                                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         max_clk = host->max_clk;
3042 
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                         max_clk = 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 (!mmc->f_max || (mmc->f_max && (mmc->f_max > max_clk)))
3055                 mmc->f_max = max_clk;
3056 
3057         if (!(host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK)) {
3058                 host->timeout_clk = (caps[0] & SDHCI_TIMEOUT_CLK_MASK) >>
3059                                         SDHCI_TIMEOUT_CLK_SHIFT;
3060                 if (host->timeout_clk == 0) {
3061                         if (host->ops->get_timeout_clock) {
3062                                 host->timeout_clk =
3063                                         host->ops->get_timeout_clock(host);
3064                         } else {
3065                                 pr_err("%s: Hardware doesn't specify timeout clock frequency.\n",
3066                                         mmc_hostname(mmc));
3067                                 return -ENODEV;
3068                         }
3069                 }
3070 
3071                 if (caps[0] & SDHCI_TIMEOUT_CLK_UNIT)
3072                         host->timeout_clk *= 1000;
3073 
3074                 if (override_timeout_clk)
3075                         host->timeout_clk = override_timeout_clk;
3076 
3077                 mmc->max_busy_timeout = host->ops->get_max_timeout_count ?
3078                         host->ops->get_max_timeout_count(host) : 1 << 27;
3079                 mmc->max_busy_timeout /= host->timeout_clk;
3080         }
3081 
3082         mmc->caps |= MMC_CAP_SDIO_IRQ | MMC_CAP_ERASE | MMC_CAP_CMD23;
3083         mmc->caps2 |= MMC_CAP2_SDIO_IRQ_NOTHREAD;
3084 
3085         if (host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12)
3086                 host->flags |= SDHCI_AUTO_CMD12;
3087 
3088         /* Auto-CMD23 stuff only works in ADMA or PIO. */
3089         if ((host->version >= SDHCI_SPEC_300) &&
3090             ((host->flags & SDHCI_USE_ADMA) ||
3091              !(host->flags & SDHCI_USE_SDMA)) &&
3092              !(host->quirks2 & SDHCI_QUIRK2_ACMD23_BROKEN)) {
3093                 host->flags |= SDHCI_AUTO_CMD23;
3094                 DBG("%s: Auto-CMD23 available\n", mmc_hostname(mmc));
3095         } else {
3096                 DBG("%s: Auto-CMD23 unavailable\n", mmc_hostname(mmc));
3097         }
3098 
3099         /*
3100          * A controller may support 8-bit width, but the board itself
3101          * might not have the pins brought out.  Boards that support
3102          * 8-bit width must set "mmc->caps |= MMC_CAP_8_BIT_DATA;" in
3103          * their platform code before calling sdhci_add_host(), and we
3104          * won't assume 8-bit width for hosts without that CAP.
3105          */
3106         if (!(host->quirks & SDHCI_QUIRK_FORCE_1_BIT_DATA))
3107                 mmc->caps |= MMC_CAP_4_BIT_DATA;
3108 
3109         if (host->quirks2 & SDHCI_QUIRK2_HOST_NO_CMD23)
3110                 mmc->caps &= ~MMC_CAP_CMD23;
3111 
3112         if (caps[0] & SDHCI_CAN_DO_HISPD)
3113                 mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
3114 
3115         if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) &&
3116             !(mmc->caps & MMC_CAP_NONREMOVABLE) &&
3117             IS_ERR_VALUE(mmc_gpio_get_cd(host->mmc)))
3118                 mmc->caps |= MMC_CAP_NEEDS_POLL;
3119 
3120         /* If there are external regulators, get them */
3121         if (mmc_regulator_get_supply(mmc) == -EPROBE_DEFER)
3122                 return -EPROBE_DEFER;
3123 
3124         /* If vqmmc regulator and no 1.8V signalling, then there's no UHS */
3125         if (!IS_ERR(mmc->supply.vqmmc)) {
3126                 ret = regulator_enable(mmc->supply.vqmmc);
3127                 if (!regulator_is_supported_voltage(mmc->supply.vqmmc, 1700000,
3128                                                     1950000))
3129                         caps[1] &= ~(SDHCI_SUPPORT_SDR104 |
3130                                         SDHCI_SUPPORT_SDR50 |
3131                                         SDHCI_SUPPORT_DDR50);
3132                 if (ret) {
3133                         pr_warn("%s: Failed to enable vqmmc regulator: %d\n",
3134                                 mmc_hostname(mmc), ret);
3135                         mmc->supply.vqmmc = ERR_PTR(-EINVAL);
3136                 }
3137         }
3138 
3139         if (host->quirks2 & SDHCI_QUIRK2_NO_1_8_V)
3140                 caps[1] &= ~(SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 |
3141                        SDHCI_SUPPORT_DDR50);
3142 
3143         /* Any UHS-I mode in caps implies SDR12 and SDR25 support. */
3144         if (caps[1] & (SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 |
3145                        SDHCI_SUPPORT_DDR50))
3146                 mmc->caps |= MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25;
3147 
3148         /* SDR104 supports also implies SDR50 support */
3149         if (caps[1] & SDHCI_SUPPORT_SDR104) {
3150                 mmc->caps |= MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_SDR50;
3151                 /* SD3.0: SDR104 is supported so (for eMMC) the caps2
3152                  * field can be promoted to support HS200.
3153                  */
3154                 if (!(host->quirks2 & SDHCI_QUIRK2_BROKEN_HS200))
3155                         mmc->caps2 |= MMC_CAP2_HS200;
3156         } else if (caps[1] & SDHCI_SUPPORT_SDR50)
3157                 mmc->caps |= MMC_CAP_UHS_SDR50;
3158 
3159         if (host->quirks2 & SDHCI_QUIRK2_CAPS_BIT63_FOR_HS400 &&
3160             (caps[1] & SDHCI_SUPPORT_HS400))
3161                 mmc->caps2 |= MMC_CAP2_HS400;
3162 
3163         if ((mmc->caps2 & MMC_CAP2_HSX00_1_2V) &&
3164             (IS_ERR(mmc->supply.vqmmc) ||
3165              !regulator_is_supported_voltage(mmc->supply.vqmmc, 1100000,
3166                                              1300000)))
3167                 mmc->caps2 &= ~MMC_CAP2_HSX00_1_2V;
3168 
3169         if ((caps[1] & SDHCI_SUPPORT_DDR50) &&
3170                 !(host->quirks2 & SDHCI_QUIRK2_BROKEN_DDR50))
3171                 mmc->caps |= MMC_CAP_UHS_DDR50;
3172 
3173         /* Does the host need tuning for SDR50? */
3174         if (caps[1] & SDHCI_USE_SDR50_TUNING)
3175                 host->flags |= SDHCI_SDR50_NEEDS_TUNING;
3176 
3177         /* Does the host need tuning for SDR104 / HS200? */
3178         if (mmc->caps2 & MMC_CAP2_HS200)
3179                 host->flags |= SDHCI_SDR104_NEEDS_TUNING;
3180 
3181         /* Driver Type(s) (A, C, D) supported by the host */
3182         if (caps[1] & SDHCI_DRIVER_TYPE_A)
3183                 mmc->caps |= MMC_CAP_DRIVER_TYPE_A;
3184         if (caps[1] & SDHCI_DRIVER_TYPE_C)
3185                 mmc->caps |= MMC_CAP_DRIVER_TYPE_C;
3186         if (caps[1] & SDHCI_DRIVER_TYPE_D)
3187                 mmc->caps |= MMC_CAP_DRIVER_TYPE_D;
3188 
3189         /* Initial value for re-tuning timer count */
3190         host->tuning_count = (caps[1] & SDHCI_RETUNING_TIMER_COUNT_MASK) >>
3191                               SDHCI_RETUNING_TIMER_COUNT_SHIFT;
3192 
3193         /*
3194          * In case Re-tuning Timer is not disabled, the actual value of
3195          * re-tuning timer will be 2 ^ (n - 1).
3196          */
3197         if (host->tuning_count)
3198                 host->tuning_count = 1 << (host->tuning_count - 1);
3199 
3200         /* Re-tuning mode supported by the Host Controller */
3201         host->tuning_mode = (caps[1] & SDHCI_RETUNING_MODE_MASK) >>
3202                              SDHCI_RETUNING_MODE_SHIFT;
3203 
3204         ocr_avail = 0;
3205 
3206         /*
3207          * According to SD Host Controller spec v3.00, if the Host System
3208          * can afford more than 150mA, Host Driver should set XPC to 1. Also
3209          * the value is meaningful only if Voltage Support in the Capabilities
3210          * register is set. The actual current value is 4 times the register
3211          * value.
3212          */
3213         max_current_caps = sdhci_readl(host, SDHCI_MAX_CURRENT);
3214         if (!max_current_caps && !IS_ERR(mmc->supply.vmmc)) {
3215                 int curr = regulator_get_current_limit(mmc->supply.vmmc);
3216                 if (curr > 0) {
3217 
3218                         /* convert to SDHCI_MAX_CURRENT format */
3219                         curr = curr/1000;  /* convert to mA */
3220                         curr = curr/SDHCI_MAX_CURRENT_MULTIPLIER;
3221 
3222                         curr = min_t(u32, curr, SDHCI_MAX_CURRENT_LIMIT);
3223                         max_current_caps =
3224                                 (curr << SDHCI_MAX_CURRENT_330_SHIFT) |
3225                                 (curr << SDHCI_MAX_CURRENT_300_SHIFT) |
3226                                 (curr << SDHCI_MAX_CURRENT_180_SHIFT);
3227                 }
3228         }
3229 
3230         if (caps[0] & SDHCI_CAN_VDD_330) {
3231                 ocr_avail |= MMC_VDD_32_33 | MMC_VDD_33_34;
3232 
3233                 mmc->max_current_330 = ((max_current_caps &
3234                                    SDHCI_MAX_CURRENT_330_MASK) >>
3235                                    SDHCI_MAX_CURRENT_330_SHIFT) *
3236                                    SDHCI_MAX_CURRENT_MULTIPLIER;
3237         }
3238         if (caps[0] & SDHCI_CAN_VDD_300) {
3239                 ocr_avail |= MMC_VDD_29_30 | MMC_VDD_30_31;
3240 
3241                 mmc->max_current_300 = ((max_current_caps &
3242                                    SDHCI_MAX_CURRENT_300_MASK) >>
3243                                    SDHCI_MAX_CURRENT_300_SHIFT) *
3244                                    SDHCI_MAX_CURRENT_MULTIPLIER;
3245         }
3246         if (caps[0] & SDHCI_CAN_VDD_180) {
3247                 ocr_avail |= MMC_VDD_165_195;
3248 
3249                 mmc->max_current_180 = ((max_current_caps &
3250                                    SDHCI_MAX_CURRENT_180_MASK) >>
3251                                    SDHCI_MAX_CURRENT_180_SHIFT) *
3252                                    SDHCI_MAX_CURRENT_MULTIPLIER;
3253         }
3254 
3255         /* If OCR set by host, use it instead. */
3256         if (host->ocr_mask)
3257                 ocr_avail = host->ocr_mask;
3258 
3259         /* If OCR set by external regulators, give it highest prio. */
3260         if (mmc->ocr_avail)
3261                 ocr_avail = mmc->ocr_avail;
3262 
3263         mmc->ocr_avail = ocr_avail;
3264         mmc->ocr_avail_sdio = ocr_avail;
3265         if (host->ocr_avail_sdio)
3266                 mmc->ocr_avail_sdio &= host->ocr_avail_sdio;
3267         mmc->ocr_avail_sd = ocr_avail;
3268         if (host->ocr_avail_sd)
3269                 mmc->ocr_avail_sd &= host->ocr_avail_sd;
3270         else /* normal SD controllers don't support 1.8V */
3271                 mmc->ocr_avail_sd &= ~MMC_VDD_165_195;
3272         mmc->ocr_avail_mmc = ocr_avail;
3273         if (host->ocr_avail_mmc)
3274                 mmc->ocr_avail_mmc &= host->ocr_avail_mmc;
3275 
3276         if (mmc->ocr_avail == 0) {
3277                 pr_err("%s: Hardware doesn't report any support voltages.\n",
3278                        mmc_hostname(mmc));
3279                 return -ENODEV;
3280         }
3281 
3282         spin_lock_init(&host->lock);
3283 
3284         /*
3285          * Maximum number of segments. Depends on if the hardware
3286          * can do scatter/gather or not.
3287          */
3288         if (host->flags & SDHCI_USE_ADMA)
3289                 mmc->max_segs = SDHCI_MAX_SEGS;
3290         else if (host->flags & SDHCI_USE_SDMA)
3291                 mmc->max_segs = 1;
3292         else /* PIO */
3293                 mmc->max_segs = SDHCI_MAX_SEGS;
3294 
3295         /*
3296          * Maximum number of sectors in one transfer. Limited by SDMA boundary
3297          * size (512KiB). Note some tuning modes impose a 4MiB limit, but this
3298          * is less anyway.
3299          */
3300         mmc->max_req_size = 524288;
3301 
3302         /*
3303          * Maximum segment size. Could be one segment with the maximum number
3304          * of bytes. When doing hardware scatter/gather, each entry cannot
3305          * be larger than 64 KiB though.
3306          */
3307         if (host->flags & SDHCI_USE_ADMA) {
3308                 if (host->quirks & SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC)
3309                         mmc->max_seg_size = 65535;
3310                 else
3311                         mmc->max_seg_size = 65536;
3312         } else {
3313                 mmc->max_seg_size = mmc->max_req_size;
3314         }
3315 
3316         /*
3317          * Maximum block size. This varies from controller to controller and
3318          * is specified in the capabilities register.
3319          */
3320         if (host->quirks & SDHCI_QUIRK_FORCE_BLK_SZ_2048) {
3321                 mmc->max_blk_size = 2;
3322         } else {
3323                 mmc->max_blk_size = (caps[0] & SDHCI_MAX_BLOCK_MASK) >>
3324                                 SDHCI_MAX_BLOCK_SHIFT;
3325                 if (mmc->max_blk_size >= 3) {
3326                         pr_warn("%s: Invalid maximum block size, assuming 512 bytes\n",
3327                                 mmc_hostname(mmc));
3328                         mmc->max_blk_size = 0;
3329                 }
3330         }
3331 
3332         mmc->max_blk_size = 512 << mmc->max_blk_size;
3333 
3334         /*
3335          * Maximum block count.
3336          */
3337         mmc->max_blk_count = (host->quirks & SDHCI_QUIRK_NO_MULTIBLOCK) ? 1 : 65535;
3338 
3339         /*
3340          * Init tasklets.
3341          */
3342         tasklet_init(&host->finish_tasklet,
3343                 sdhci_tasklet_finish, (unsigned long)host);
3344 
3345         setup_timer(&host->timer, sdhci_timeout_timer, (unsigned long)host);
3346 
3347         init_waitqueue_head(&host->buf_ready_int);
3348 
3349         sdhci_init(host, 0);
3350 
3351         ret = request_threaded_irq(host->irq, sdhci_irq, sdhci_thread_irq,
3352                                    IRQF_SHARED, mmc_hostname(mmc), host);
3353         if (ret) {
3354                 pr_err("%s: Failed to request IRQ %d: %d\n",
3355                        mmc_hostname(mmc), host->irq, ret);
3356                 goto untasklet;
3357         }
3358 
3359 #ifdef CONFIG_MMC_DEBUG
3360         sdhci_dumpregs(host);
3361 #endif
3362 
3363 #ifdef SDHCI_USE_LEDS_CLASS
3364         snprintf(host->led_name, sizeof(host->led_name),
3365                 "%s::", mmc_hostname(mmc));
3366         host->led.name = host->led_name;
3367         host->led.brightness = LED_OFF;
3368         host->led.default_trigger = mmc_hostname(mmc);
3369         host->led.brightness_set = sdhci_led_control;
3370 
3371         ret = led_classdev_register(mmc_dev(mmc), &host->led);
3372         if (ret) {
3373                 pr_err("%s: Failed to register LED device: %d\n",
3374                        mmc_hostname(mmc), ret);
3375                 goto reset;
3376         }
3377 #endif
3378 
3379         mmiowb();
3380 
3381         mmc_add_host(mmc);
3382 
3383         pr_info("%s: SDHCI controller on %s [%s] using %s\n",
3384                 mmc_hostname(mmc), host->hw_name, dev_name(mmc_dev(mmc)),
3385                 (host->flags & SDHCI_USE_ADMA) ?
3386                 (host->flags & SDHCI_USE_64_BIT_DMA) ? "ADMA 64-bit" : "ADMA" :
3387                 (host->flags & SDHCI_USE_SDMA) ? "DMA" : "PIO");
3388 
3389         sdhci_enable_card_detection(host);
3390 
3391         return 0;
3392 
3393 #ifdef SDHCI_USE_LEDS_CLASS
3394 reset:
3395         sdhci_do_reset(host, SDHCI_RESET_ALL);
3396         sdhci_writel(host, 0, SDHCI_INT_ENABLE);
3397         sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
3398         free_irq(host->irq, host);
3399 #endif
3400 untasklet:
3401         tasklet_kill(&host->finish_tasklet);
3402 
3403         return ret;
3404 }
3405 
3406 EXPORT_SYMBOL_GPL(sdhci_add_host);
3407 
3408 void sdhci_remove_host(struct sdhci_host *host, int dead)
3409 {
3410         struct mmc_host *mmc = host->mmc;
3411         unsigned long flags;
3412 
3413         if (dead) {
3414                 spin_lock_irqsave(&host->lock, flags);
3415 
3416                 host->flags |= SDHCI_DEVICE_DEAD;
3417 
3418                 if (host->mrq) {
3419                         pr_err("%s: Controller removed during "
3420                                 " transfer!\n", mmc_hostname(mmc));
3421 
3422                         host->mrq->cmd->error = -ENOMEDIUM;
3423                         tasklet_schedule(&host->finish_tasklet);
3424                 }
3425 
3426                 spin_unlock_irqrestore(&host->lock, flags);
3427         }
3428 
3429         sdhci_disable_card_detection(host);
3430 
3431         mmc_remove_host(mmc);
3432 
3433 #ifdef SDHCI_USE_LEDS_CLASS
3434         led_classdev_unregister(&host->led);
3435 #endif
3436 
3437         if (!dead)
3438                 sdhci_do_reset(host, SDHCI_RESET_ALL);
3439 
3440         sdhci_writel(host, 0, SDHCI_INT_ENABLE);
3441         sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
3442         free_irq(host->irq, host);
3443 
3444         del_timer_sync(&host->timer);
3445 
3446         tasklet_kill(&host->finish_tasklet);
3447 
3448         if (!IS_ERR(mmc->supply.vqmmc))
3449                 regulator_disable(mmc->supply.vqmmc);
3450 
3451         if (host->align_buffer)
3452                 dma_free_coherent(mmc_dev(mmc), host->align_buffer_sz +
3453                                   host->adma_table_sz, host->align_buffer,
3454                                   host->align_addr);
3455 
3456         host->adma_table = NULL;
3457         host->align_buffer = NULL;
3458 }
3459 
3460 EXPORT_SYMBOL_GPL(sdhci_remove_host);
3461 
3462 void sdhci_free_host(struct sdhci_host *host)
3463 {
3464         mmc_free_host(host->mmc);
3465 }
3466 
3467 EXPORT_SYMBOL_GPL(sdhci_free_host);
3468 
3469 /*****************************************************************************\
3470  *                                                                           *
3471  * Driver init/exit                                                          *
3472  *                                                                           *
3473 \*****************************************************************************/
3474 
3475 static int __init sdhci_drv_init(void)
3476 {
3477         pr_info(DRIVER_NAME
3478                 ": Secure Digital Host Controller Interface driver\n");
3479         pr_info(DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
3480 
3481         return 0;
3482 }
3483 
3484 static void __exit sdhci_drv_exit(void)
3485 {
3486 }
3487 
3488 module_init(sdhci_drv_init);
3489 module_exit(sdhci_drv_exit);
3490 
3491 module_param(debug_quirks, uint, 0444);
3492 module_param(debug_quirks2, uint, 0444);
3493 
3494 MODULE_AUTHOR("Pierre Ossman <pierre@ossman.eu>");
3495 MODULE_DESCRIPTION("Secure Digital Host Controller Interface core driver");
3496 MODULE_LICENSE("GPL");
3497 
3498 MODULE_PARM_DESC(debug_quirks, "Force certain quirks.");
3499 MODULE_PARM_DESC(debug_quirks2, "Force certain other quirks.");
3500 

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