Version:  2.0.40 2.2.26 2.4.37 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4

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_pre_dma_transfer(struct sdhci_host *host,
 57                                         struct mmc_data *data);
 58 static int sdhci_do_get_cd(struct sdhci_host *host);
 59 
 60 #ifdef CONFIG_PM
 61 static int sdhci_runtime_pm_get(struct sdhci_host *host);
 62 static int sdhci_runtime_pm_put(struct sdhci_host *host);
 63 static void sdhci_runtime_pm_bus_on(struct sdhci_host *host);
 64 static void sdhci_runtime_pm_bus_off(struct sdhci_host *host);
 65 #else
 66 static inline int sdhci_runtime_pm_get(struct sdhci_host *host)
 67 {
 68         return 0;
 69 }
 70 static inline int sdhci_runtime_pm_put(struct sdhci_host *host)
 71 {
 72         return 0;
 73 }
 74 static void sdhci_runtime_pm_bus_on(struct sdhci_host *host)
 75 {
 76 }
 77 static void sdhci_runtime_pm_bus_off(struct sdhci_host *host)
 78 {
 79 }
 80 #endif
 81 
 82 static void sdhci_dumpregs(struct sdhci_host *host)
 83 {
 84         pr_debug(DRIVER_NAME ": =========== REGISTER DUMP (%s)===========\n",
 85                 mmc_hostname(host->mmc));
 86 
 87         pr_debug(DRIVER_NAME ": Sys addr: 0x%08x | Version:  0x%08x\n",
 88                 sdhci_readl(host, SDHCI_DMA_ADDRESS),
 89                 sdhci_readw(host, SDHCI_HOST_VERSION));
 90         pr_debug(DRIVER_NAME ": Blk size: 0x%08x | Blk cnt:  0x%08x\n",
 91                 sdhci_readw(host, SDHCI_BLOCK_SIZE),
 92                 sdhci_readw(host, SDHCI_BLOCK_COUNT));
 93         pr_debug(DRIVER_NAME ": Argument: 0x%08x | Trn mode: 0x%08x\n",
 94                 sdhci_readl(host, SDHCI_ARGUMENT),
 95                 sdhci_readw(host, SDHCI_TRANSFER_MODE));
 96         pr_debug(DRIVER_NAME ": Present:  0x%08x | Host ctl: 0x%08x\n",
 97                 sdhci_readl(host, SDHCI_PRESENT_STATE),
 98                 sdhci_readb(host, SDHCI_HOST_CONTROL));
 99         pr_debug(DRIVER_NAME ": Power:    0x%08x | Blk gap:  0x%08x\n",
100                 sdhci_readb(host, SDHCI_POWER_CONTROL),
101                 sdhci_readb(host, SDHCI_BLOCK_GAP_CONTROL));
102         pr_debug(DRIVER_NAME ": Wake-up:  0x%08x | Clock:    0x%08x\n",
103                 sdhci_readb(host, SDHCI_WAKE_UP_CONTROL),
104                 sdhci_readw(host, SDHCI_CLOCK_CONTROL));
105         pr_debug(DRIVER_NAME ": Timeout:  0x%08x | Int stat: 0x%08x\n",
106                 sdhci_readb(host, SDHCI_TIMEOUT_CONTROL),
107                 sdhci_readl(host, SDHCI_INT_STATUS));
108         pr_debug(DRIVER_NAME ": Int enab: 0x%08x | Sig enab: 0x%08x\n",
109                 sdhci_readl(host, SDHCI_INT_ENABLE),
110                 sdhci_readl(host, SDHCI_SIGNAL_ENABLE));
111         pr_debug(DRIVER_NAME ": AC12 err: 0x%08x | Slot int: 0x%08x\n",
112                 sdhci_readw(host, SDHCI_ACMD12_ERR),
113                 sdhci_readw(host, SDHCI_SLOT_INT_STATUS));
114         pr_debug(DRIVER_NAME ": Caps:     0x%08x | Caps_1:   0x%08x\n",
115                 sdhci_readl(host, SDHCI_CAPABILITIES),
116                 sdhci_readl(host, SDHCI_CAPABILITIES_1));
117         pr_debug(DRIVER_NAME ": Cmd:      0x%08x | Max curr: 0x%08x\n",
118                 sdhci_readw(host, SDHCI_COMMAND),
119                 sdhci_readl(host, SDHCI_MAX_CURRENT));
120         pr_debug(DRIVER_NAME ": Host ctl2: 0x%08x\n",
121                 sdhci_readw(host, SDHCI_HOST_CONTROL2));
122 
123         if (host->flags & SDHCI_USE_ADMA) {
124                 if (host->flags & SDHCI_USE_64_BIT_DMA)
125                         pr_debug(DRIVER_NAME ": ADMA Err: 0x%08x | ADMA Ptr: 0x%08x%08x\n",
126                                  readl(host->ioaddr + SDHCI_ADMA_ERROR),
127                                  readl(host->ioaddr + SDHCI_ADMA_ADDRESS_HI),
128                                  readl(host->ioaddr + SDHCI_ADMA_ADDRESS));
129                 else
130                         pr_debug(DRIVER_NAME ": ADMA Err: 0x%08x | ADMA Ptr: 0x%08x\n",
131                                  readl(host->ioaddr + SDHCI_ADMA_ERROR),
132                                  readl(host->ioaddr + SDHCI_ADMA_ADDRESS));
133         }
134 
135         pr_debug(DRIVER_NAME ": ===========================================\n");
136 }
137 
138 /*****************************************************************************\
139  *                                                                           *
140  * Low level functions                                                       *
141  *                                                                           *
142 \*****************************************************************************/
143 
144 static void sdhci_set_card_detection(struct sdhci_host *host, bool enable)
145 {
146         u32 present;
147 
148         if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) ||
149             (host->mmc->caps & MMC_CAP_NONREMOVABLE))
150                 return;
151 
152         if (enable) {
153                 present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
154                                       SDHCI_CARD_PRESENT;
155 
156                 host->ier |= present ? SDHCI_INT_CARD_REMOVE :
157                                        SDHCI_INT_CARD_INSERT;
158         } else {
159                 host->ier &= ~(SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT);
160         }
161 
162         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
163         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
164 }
165 
166 static void sdhci_enable_card_detection(struct sdhci_host *host)
167 {
168         sdhci_set_card_detection(host, true);
169 }
170 
171 static void sdhci_disable_card_detection(struct sdhci_host *host)
172 {
173         sdhci_set_card_detection(host, false);
174 }
175 
176 void sdhci_reset(struct sdhci_host *host, u8 mask)
177 {
178         unsigned long timeout;
179 
180         sdhci_writeb(host, mask, SDHCI_SOFTWARE_RESET);
181 
182         if (mask & SDHCI_RESET_ALL) {
183                 host->clock = 0;
184                 /* Reset-all turns off SD Bus Power */
185                 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
186                         sdhci_runtime_pm_bus_off(host);
187         }
188 
189         /* Wait max 100 ms */
190         timeout = 100;
191 
192         /* hw clears the bit when it's done */
193         while (sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask) {
194                 if (timeout == 0) {
195                         pr_err("%s: Reset 0x%x never completed.\n",
196                                 mmc_hostname(host->mmc), (int)mask);
197                         sdhci_dumpregs(host);
198                         return;
199                 }
200                 timeout--;
201                 mdelay(1);
202         }
203 }
204 EXPORT_SYMBOL_GPL(sdhci_reset);
205 
206 static void sdhci_do_reset(struct sdhci_host *host, u8 mask)
207 {
208         if (host->quirks & SDHCI_QUIRK_NO_CARD_NO_RESET) {
209                 if (!sdhci_do_get_cd(host))
210                         return;
211         }
212 
213         host->ops->reset(host, mask);
214 
215         if (mask & SDHCI_RESET_ALL) {
216                 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
217                         if (host->ops->enable_dma)
218                                 host->ops->enable_dma(host);
219                 }
220 
221                 /* Resetting the controller clears many */
222                 host->preset_enabled = false;
223         }
224 }
225 
226 static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios);
227 
228 static void sdhci_init(struct sdhci_host *host, int soft)
229 {
230         if (soft)
231                 sdhci_do_reset(host, SDHCI_RESET_CMD|SDHCI_RESET_DATA);
232         else
233                 sdhci_do_reset(host, SDHCI_RESET_ALL);
234 
235         host->ier = SDHCI_INT_BUS_POWER | SDHCI_INT_DATA_END_BIT |
236                     SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_TIMEOUT |
237                     SDHCI_INT_INDEX | SDHCI_INT_END_BIT | SDHCI_INT_CRC |
238                     SDHCI_INT_TIMEOUT | SDHCI_INT_DATA_END |
239                     SDHCI_INT_RESPONSE;
240 
241         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
242         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
243 
244         if (soft) {
245                 /* force clock reconfiguration */
246                 host->clock = 0;
247                 sdhci_set_ios(host->mmc, &host->mmc->ios);
248         }
249 }
250 
251 static void sdhci_reinit(struct sdhci_host *host)
252 {
253         sdhci_init(host, 0);
254         sdhci_enable_card_detection(host);
255 }
256 
257 static void sdhci_activate_led(struct sdhci_host *host)
258 {
259         u8 ctrl;
260 
261         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
262         ctrl |= SDHCI_CTRL_LED;
263         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
264 }
265 
266 static void sdhci_deactivate_led(struct sdhci_host *host)
267 {
268         u8 ctrl;
269 
270         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
271         ctrl &= ~SDHCI_CTRL_LED;
272         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
273 }
274 
275 #ifdef SDHCI_USE_LEDS_CLASS
276 static void sdhci_led_control(struct led_classdev *led,
277         enum led_brightness brightness)
278 {
279         struct sdhci_host *host = container_of(led, struct sdhci_host, led);
280         unsigned long flags;
281 
282         spin_lock_irqsave(&host->lock, flags);
283 
284         if (host->runtime_suspended)
285                 goto out;
286 
287         if (brightness == LED_OFF)
288                 sdhci_deactivate_led(host);
289         else
290                 sdhci_activate_led(host);
291 out:
292         spin_unlock_irqrestore(&host->lock, flags);
293 }
294 #endif
295 
296 /*****************************************************************************\
297  *                                                                           *
298  * Core functions                                                            *
299  *                                                                           *
300 \*****************************************************************************/
301 
302 static void sdhci_read_block_pio(struct sdhci_host *host)
303 {
304         unsigned long flags;
305         size_t blksize, len, chunk;
306         u32 uninitialized_var(scratch);
307         u8 *buf;
308 
309         DBG("PIO reading\n");
310 
311         blksize = host->data->blksz;
312         chunk = 0;
313 
314         local_irq_save(flags);
315 
316         while (blksize) {
317                 BUG_ON(!sg_miter_next(&host->sg_miter));
318 
319                 len = min(host->sg_miter.length, blksize);
320 
321                 blksize -= len;
322                 host->sg_miter.consumed = len;
323 
324                 buf = host->sg_miter.addr;
325 
326                 while (len) {
327                         if (chunk == 0) {
328                                 scratch = sdhci_readl(host, SDHCI_BUFFER);
329                                 chunk = 4;
330                         }
331 
332                         *buf = scratch & 0xFF;
333 
334                         buf++;
335                         scratch >>= 8;
336                         chunk--;
337                         len--;
338                 }
339         }
340 
341         sg_miter_stop(&host->sg_miter);
342 
343         local_irq_restore(flags);
344 }
345 
346 static void sdhci_write_block_pio(struct sdhci_host *host)
347 {
348         unsigned long flags;
349         size_t blksize, len, chunk;
350         u32 scratch;
351         u8 *buf;
352 
353         DBG("PIO writing\n");
354 
355         blksize = host->data->blksz;
356         chunk = 0;
357         scratch = 0;
358 
359         local_irq_save(flags);
360 
361         while (blksize) {
362                 BUG_ON(!sg_miter_next(&host->sg_miter));
363 
364                 len = min(host->sg_miter.length, blksize);
365 
366                 blksize -= len;
367                 host->sg_miter.consumed = len;
368 
369                 buf = host->sg_miter.addr;
370 
371                 while (len) {
372                         scratch |= (u32)*buf << (chunk * 8);
373 
374                         buf++;
375                         chunk++;
376                         len--;
377 
378                         if ((chunk == 4) || ((len == 0) && (blksize == 0))) {
379                                 sdhci_writel(host, scratch, SDHCI_BUFFER);
380                                 chunk = 0;
381                                 scratch = 0;
382                         }
383                 }
384         }
385 
386         sg_miter_stop(&host->sg_miter);
387 
388         local_irq_restore(flags);
389 }
390 
391 static void sdhci_transfer_pio(struct sdhci_host *host)
392 {
393         u32 mask;
394 
395         BUG_ON(!host->data);
396 
397         if (host->blocks == 0)
398                 return;
399 
400         if (host->data->flags & MMC_DATA_READ)
401                 mask = SDHCI_DATA_AVAILABLE;
402         else
403                 mask = SDHCI_SPACE_AVAILABLE;
404 
405         /*
406          * Some controllers (JMicron JMB38x) mess up the buffer bits
407          * for transfers < 4 bytes. As long as it is just one block,
408          * we can ignore the bits.
409          */
410         if ((host->quirks & SDHCI_QUIRK_BROKEN_SMALL_PIO) &&
411                 (host->data->blocks == 1))
412                 mask = ~0;
413 
414         while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) {
415                 if (host->quirks & SDHCI_QUIRK_PIO_NEEDS_DELAY)
416                         udelay(100);
417 
418                 if (host->data->flags & MMC_DATA_READ)
419                         sdhci_read_block_pio(host);
420                 else
421                         sdhci_write_block_pio(host);
422 
423                 host->blocks--;
424                 if (host->blocks == 0)
425                         break;
426         }
427 
428         DBG("PIO transfer complete.\n");
429 }
430 
431 static char *sdhci_kmap_atomic(struct scatterlist *sg, unsigned long *flags)
432 {
433         local_irq_save(*flags);
434         return kmap_atomic(sg_page(sg)) + sg->offset;
435 }
436 
437 static void sdhci_kunmap_atomic(void *buffer, unsigned long *flags)
438 {
439         kunmap_atomic(buffer);
440         local_irq_restore(*flags);
441 }
442 
443 static void sdhci_adma_write_desc(struct sdhci_host *host, void *desc,
444                                   dma_addr_t addr, int len, unsigned cmd)
445 {
446         struct sdhci_adma2_64_desc *dma_desc = desc;
447 
448         /* 32-bit and 64-bit descriptors have these members in same position */
449         dma_desc->cmd = cpu_to_le16(cmd);
450         dma_desc->len = cpu_to_le16(len);
451         dma_desc->addr_lo = cpu_to_le32((u32)addr);
452 
453         if (host->flags & SDHCI_USE_64_BIT_DMA)
454                 dma_desc->addr_hi = cpu_to_le32((u64)addr >> 32);
455 }
456 
457 static void sdhci_adma_mark_end(void *desc)
458 {
459         struct sdhci_adma2_64_desc *dma_desc = desc;
460 
461         /* 32-bit and 64-bit descriptors have 'cmd' in same position */
462         dma_desc->cmd |= cpu_to_le16(ADMA2_END);
463 }
464 
465 static int sdhci_adma_table_pre(struct sdhci_host *host,
466         struct mmc_data *data)
467 {
468         int direction;
469 
470         void *desc;
471         void *align;
472         dma_addr_t addr;
473         dma_addr_t align_addr;
474         int len, offset;
475 
476         struct scatterlist *sg;
477         int i;
478         char *buffer;
479         unsigned long flags;
480 
481         /*
482          * The spec does not specify endianness of descriptor table.
483          * We currently guess that it is LE.
484          */
485 
486         if (data->flags & MMC_DATA_READ)
487                 direction = DMA_FROM_DEVICE;
488         else
489                 direction = DMA_TO_DEVICE;
490 
491         host->align_addr = dma_map_single(mmc_dev(host->mmc),
492                 host->align_buffer, host->align_buffer_sz, direction);
493         if (dma_mapping_error(mmc_dev(host->mmc), host->align_addr))
494                 goto fail;
495         BUG_ON(host->align_addr & host->align_mask);
496 
497         host->sg_count = sdhci_pre_dma_transfer(host, data);
498         if (host->sg_count < 0)
499                 goto unmap_align;
500 
501         desc = host->adma_table;
502         align = host->align_buffer;
503 
504         align_addr = host->align_addr;
505 
506         for_each_sg(data->sg, sg, host->sg_count, i) {
507                 addr = sg_dma_address(sg);
508                 len = sg_dma_len(sg);
509 
510                 /*
511                  * The SDHCI specification states that ADMA
512                  * addresses must be 32-bit aligned. If they
513                  * aren't, then we use a bounce buffer for
514                  * the (up to three) bytes that screw up the
515                  * alignment.
516                  */
517                 offset = (host->align_sz - (addr & host->align_mask)) &
518                          host->align_mask;
519                 if (offset) {
520                         if (data->flags & MMC_DATA_WRITE) {
521                                 buffer = sdhci_kmap_atomic(sg, &flags);
522                                 memcpy(align, buffer, offset);
523                                 sdhci_kunmap_atomic(buffer, &flags);
524                         }
525 
526                         /* tran, valid */
527                         sdhci_adma_write_desc(host, desc, align_addr, offset,
528                                               ADMA2_TRAN_VALID);
529 
530                         BUG_ON(offset > 65536);
531 
532                         align += host->align_sz;
533                         align_addr += host->align_sz;
534 
535                         desc += host->desc_sz;
536 
537                         addr += offset;
538                         len -= offset;
539                 }
540 
541                 BUG_ON(len > 65536);
542 
543                 /* tran, valid */
544                 sdhci_adma_write_desc(host, desc, addr, len, ADMA2_TRAN_VALID);
545                 desc += host->desc_sz;
546 
547                 /*
548                  * If this triggers then we have a calculation bug
549                  * somewhere. :/
550                  */
551                 WARN_ON((desc - host->adma_table) >= host->adma_table_sz);
552         }
553 
554         if (host->quirks & SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC) {
555                 /*
556                 * Mark the last descriptor as the terminating descriptor
557                 */
558                 if (desc != host->adma_table) {
559                         desc -= host->desc_sz;
560                         sdhci_adma_mark_end(desc);
561                 }
562         } else {
563                 /*
564                 * Add a terminating entry.
565                 */
566 
567                 /* nop, end, valid */
568                 sdhci_adma_write_desc(host, desc, 0, 0, ADMA2_NOP_END_VALID);
569         }
570 
571         /*
572          * Resync align buffer as we might have changed it.
573          */
574         if (data->flags & MMC_DATA_WRITE) {
575                 dma_sync_single_for_device(mmc_dev(host->mmc),
576                         host->align_addr, host->align_buffer_sz, direction);
577         }
578 
579         return 0;
580 
581 unmap_align:
582         dma_unmap_single(mmc_dev(host->mmc), host->align_addr,
583                 host->align_buffer_sz, direction);
584 fail:
585         return -EINVAL;
586 }
587 
588 static void sdhci_adma_table_post(struct sdhci_host *host,
589         struct mmc_data *data)
590 {
591         int direction;
592 
593         struct scatterlist *sg;
594         int i, size;
595         void *align;
596         char *buffer;
597         unsigned long flags;
598         bool has_unaligned;
599 
600         if (data->flags & MMC_DATA_READ)
601                 direction = DMA_FROM_DEVICE;
602         else
603                 direction = DMA_TO_DEVICE;
604 
605         dma_unmap_single(mmc_dev(host->mmc), host->align_addr,
606                 host->align_buffer_sz, direction);
607 
608         /* Do a quick scan of the SG list for any unaligned mappings */
609         has_unaligned = false;
610         for_each_sg(data->sg, sg, host->sg_count, i)
611                 if (sg_dma_address(sg) & host->align_mask) {
612                         has_unaligned = true;
613                         break;
614                 }
615 
616         if (has_unaligned && data->flags & MMC_DATA_READ) {
617                 dma_sync_sg_for_cpu(mmc_dev(host->mmc), data->sg,
618                         data->sg_len, direction);
619 
620                 align = host->align_buffer;
621 
622                 for_each_sg(data->sg, sg, host->sg_count, i) {
623                         if (sg_dma_address(sg) & host->align_mask) {
624                                 size = host->align_sz -
625                                        (sg_dma_address(sg) & host->align_mask);
626 
627                                 buffer = sdhci_kmap_atomic(sg, &flags);
628                                 memcpy(buffer, align, size);
629                                 sdhci_kunmap_atomic(buffer, &flags);
630 
631                                 align += host->align_sz;
632                         }
633                 }
634         }
635 
636         if (data->host_cookie == COOKIE_MAPPED) {
637                 dma_unmap_sg(mmc_dev(host->mmc), data->sg,
638                         data->sg_len, direction);
639                 data->host_cookie = COOKIE_UNMAPPED;
640         }
641 }
642 
643 static u8 sdhci_calc_timeout(struct sdhci_host *host, struct mmc_command *cmd)
644 {
645         u8 count;
646         struct mmc_data *data = cmd->data;
647         unsigned target_timeout, current_timeout;
648 
649         /*
650          * If the host controller provides us with an incorrect timeout
651          * value, just skip the check and use 0xE.  The hardware may take
652          * longer to time out, but that's much better than having a too-short
653          * timeout value.
654          */
655         if (host->quirks & SDHCI_QUIRK_BROKEN_TIMEOUT_VAL)
656                 return 0xE;
657 
658         /* Unspecified timeout, assume max */
659         if (!data && !cmd->busy_timeout)
660                 return 0xE;
661 
662         /* timeout in us */
663         if (!data)
664                 target_timeout = cmd->busy_timeout * 1000;
665         else {
666                 target_timeout = data->timeout_ns / 1000;
667                 if (host->clock)
668                         target_timeout += data->timeout_clks / host->clock;
669         }
670 
671         /*
672          * Figure out needed cycles.
673          * We do this in steps in order to fit inside a 32 bit int.
674          * The first step is the minimum timeout, which will have a
675          * minimum resolution of 6 bits:
676          * (1) 2^13*1000 > 2^22,
677          * (2) host->timeout_clk < 2^16
678          *     =>
679          *     (1) / (2) > 2^6
680          */
681         count = 0;
682         current_timeout = (1 << 13) * 1000 / host->timeout_clk;
683         while (current_timeout < target_timeout) {
684                 count++;
685                 current_timeout <<= 1;
686                 if (count >= 0xF)
687                         break;
688         }
689 
690         if (count >= 0xF) {
691                 DBG("%s: Too large timeout 0x%x requested for CMD%d!\n",
692                     mmc_hostname(host->mmc), count, cmd->opcode);
693                 count = 0xE;
694         }
695 
696         return count;
697 }
698 
699 static void sdhci_set_transfer_irqs(struct sdhci_host *host)
700 {
701         u32 pio_irqs = SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL;
702         u32 dma_irqs = SDHCI_INT_DMA_END | SDHCI_INT_ADMA_ERROR;
703 
704         if (host->flags & SDHCI_REQ_USE_DMA)
705                 host->ier = (host->ier & ~pio_irqs) | dma_irqs;
706         else
707                 host->ier = (host->ier & ~dma_irqs) | pio_irqs;
708 
709         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
710         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
711 }
712 
713 static void sdhci_set_timeout(struct sdhci_host *host, struct mmc_command *cmd)
714 {
715         u8 count;
716 
717         if (host->ops->set_timeout) {
718                 host->ops->set_timeout(host, cmd);
719         } else {
720                 count = sdhci_calc_timeout(host, cmd);
721                 sdhci_writeb(host, count, SDHCI_TIMEOUT_CONTROL);
722         }
723 }
724 
725 static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd)
726 {
727         u8 ctrl;
728         struct mmc_data *data = cmd->data;
729         int ret;
730 
731         WARN_ON(host->data);
732 
733         if (data || (cmd->flags & MMC_RSP_BUSY))
734                 sdhci_set_timeout(host, cmd);
735 
736         if (!data)
737                 return;
738 
739         /* Sanity checks */
740         BUG_ON(data->blksz * data->blocks > 524288);
741         BUG_ON(data->blksz > host->mmc->max_blk_size);
742         BUG_ON(data->blocks > 65535);
743 
744         host->data = data;
745         host->data_early = 0;
746         host->data->bytes_xfered = 0;
747 
748         if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA))
749                 host->flags |= SDHCI_REQ_USE_DMA;
750 
751         /*
752          * FIXME: This doesn't account for merging when mapping the
753          * scatterlist.
754          */
755         if (host->flags & SDHCI_REQ_USE_DMA) {
756                 int broken, i;
757                 struct scatterlist *sg;
758 
759                 broken = 0;
760                 if (host->flags & SDHCI_USE_ADMA) {
761                         if (host->quirks & SDHCI_QUIRK_32BIT_ADMA_SIZE)
762                                 broken = 1;
763                 } else {
764                         if (host->quirks & SDHCI_QUIRK_32BIT_DMA_SIZE)
765                                 broken = 1;
766                 }
767 
768                 if (unlikely(broken)) {
769                         for_each_sg(data->sg, sg, data->sg_len, i) {
770                                 if (sg->length & 0x3) {
771                                         DBG("Reverting to PIO because of "
772                                                 "transfer size (%d)\n",
773                                                 sg->length);
774                                         host->flags &= ~SDHCI_REQ_USE_DMA;
775                                         break;
776                                 }
777                         }
778                 }
779         }
780 
781         /*
782          * The assumption here being that alignment is the same after
783          * translation to device address space.
784          */
785         if (host->flags & SDHCI_REQ_USE_DMA) {
786                 int broken, i;
787                 struct scatterlist *sg;
788 
789                 broken = 0;
790                 if (host->flags & SDHCI_USE_ADMA) {
791                         /*
792                          * As we use 3 byte chunks to work around
793                          * alignment problems, we need to check this
794                          * quirk.
795                          */
796                         if (host->quirks & SDHCI_QUIRK_32BIT_ADMA_SIZE)
797                                 broken = 1;
798                 } else {
799                         if (host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR)
800                                 broken = 1;
801                 }
802 
803                 if (unlikely(broken)) {
804                         for_each_sg(data->sg, sg, data->sg_len, i) {
805                                 if (sg->offset & 0x3) {
806                                         DBG("Reverting to PIO because of "
807                                                 "bad alignment\n");
808                                         host->flags &= ~SDHCI_REQ_USE_DMA;
809                                         break;
810                                 }
811                         }
812                 }
813         }
814 
815         if (host->flags & SDHCI_REQ_USE_DMA) {
816                 if (host->flags & SDHCI_USE_ADMA) {
817                         ret = sdhci_adma_table_pre(host, data);
818                         if (ret) {
819                                 /*
820                                  * This only happens when someone fed
821                                  * us an invalid request.
822                                  */
823                                 WARN_ON(1);
824                                 host->flags &= ~SDHCI_REQ_USE_DMA;
825                         } else {
826                                 sdhci_writel(host, host->adma_addr,
827                                         SDHCI_ADMA_ADDRESS);
828                                 if (host->flags & SDHCI_USE_64_BIT_DMA)
829                                         sdhci_writel(host,
830                                                      (u64)host->adma_addr >> 32,
831                                                      SDHCI_ADMA_ADDRESS_HI);
832                         }
833                 } else {
834                         int sg_cnt;
835 
836                         sg_cnt = sdhci_pre_dma_transfer(host, data);
837                         if (sg_cnt <= 0) {
838                                 /*
839                                  * This only happens when someone fed
840                                  * us an invalid request.
841                                  */
842                                 WARN_ON(1);
843                                 host->flags &= ~SDHCI_REQ_USE_DMA;
844                         } else {
845                                 WARN_ON(sg_cnt != 1);
846                                 sdhci_writel(host, sg_dma_address(data->sg),
847                                         SDHCI_DMA_ADDRESS);
848                         }
849                 }
850         }
851 
852         /*
853          * Always adjust the DMA selection as some controllers
854          * (e.g. JMicron) can't do PIO properly when the selection
855          * is ADMA.
856          */
857         if (host->version >= SDHCI_SPEC_200) {
858                 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
859                 ctrl &= ~SDHCI_CTRL_DMA_MASK;
860                 if ((host->flags & SDHCI_REQ_USE_DMA) &&
861                         (host->flags & SDHCI_USE_ADMA)) {
862                         if (host->flags & SDHCI_USE_64_BIT_DMA)
863                                 ctrl |= SDHCI_CTRL_ADMA64;
864                         else
865                                 ctrl |= SDHCI_CTRL_ADMA32;
866                 } else {
867                         ctrl |= SDHCI_CTRL_SDMA;
868                 }
869                 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
870         }
871 
872         if (!(host->flags & SDHCI_REQ_USE_DMA)) {
873                 int flags;
874 
875                 flags = SG_MITER_ATOMIC;
876                 if (host->data->flags & MMC_DATA_READ)
877                         flags |= SG_MITER_TO_SG;
878                 else
879                         flags |= SG_MITER_FROM_SG;
880                 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
881                 host->blocks = data->blocks;
882         }
883 
884         sdhci_set_transfer_irqs(host);
885 
886         /* Set the DMA boundary value and block size */
887         sdhci_writew(host, SDHCI_MAKE_BLKSZ(SDHCI_DEFAULT_BOUNDARY_ARG,
888                 data->blksz), SDHCI_BLOCK_SIZE);
889         sdhci_writew(host, data->blocks, SDHCI_BLOCK_COUNT);
890 }
891 
892 static void sdhci_set_transfer_mode(struct sdhci_host *host,
893         struct mmc_command *cmd)
894 {
895         u16 mode = 0;
896         struct mmc_data *data = cmd->data;
897 
898         if (data == NULL) {
899                 if (host->quirks2 &
900                         SDHCI_QUIRK2_CLEAR_TRANSFERMODE_REG_BEFORE_CMD) {
901                         sdhci_writew(host, 0x0, SDHCI_TRANSFER_MODE);
902                 } else {
903                 /* clear Auto CMD settings for no data CMDs */
904                         mode = sdhci_readw(host, SDHCI_TRANSFER_MODE);
905                         sdhci_writew(host, mode & ~(SDHCI_TRNS_AUTO_CMD12 |
906                                 SDHCI_TRNS_AUTO_CMD23), SDHCI_TRANSFER_MODE);
907                 }
908                 return;
909         }
910 
911         WARN_ON(!host->data);
912 
913         if (!(host->quirks2 & SDHCI_QUIRK2_SUPPORT_SINGLE))
914                 mode = SDHCI_TRNS_BLK_CNT_EN;
915 
916         if (mmc_op_multi(cmd->opcode) || data->blocks > 1) {
917                 mode = SDHCI_TRNS_BLK_CNT_EN | SDHCI_TRNS_MULTI;
918                 /*
919                  * If we are sending CMD23, CMD12 never gets sent
920                  * on successful completion (so no Auto-CMD12).
921                  */
922                 if (!host->mrq->sbc && (host->flags & SDHCI_AUTO_CMD12) &&
923                     (cmd->opcode != SD_IO_RW_EXTENDED))
924                         mode |= SDHCI_TRNS_AUTO_CMD12;
925                 else if (host->mrq->sbc && (host->flags & SDHCI_AUTO_CMD23)) {
926                         mode |= SDHCI_TRNS_AUTO_CMD23;
927                         sdhci_writel(host, host->mrq->sbc->arg, SDHCI_ARGUMENT2);
928                 }
929         }
930 
931         if (data->flags & MMC_DATA_READ)
932                 mode |= SDHCI_TRNS_READ;
933         if (host->flags & SDHCI_REQ_USE_DMA)
934                 mode |= SDHCI_TRNS_DMA;
935 
936         sdhci_writew(host, mode, SDHCI_TRANSFER_MODE);
937 }
938 
939 static void sdhci_finish_data(struct sdhci_host *host)
940 {
941         struct mmc_data *data;
942 
943         BUG_ON(!host->data);
944 
945         data = host->data;
946         host->data = NULL;
947 
948         if (host->flags & SDHCI_REQ_USE_DMA) {
949                 if (host->flags & SDHCI_USE_ADMA)
950                         sdhci_adma_table_post(host, data);
951                 else {
952                         if (data->host_cookie == COOKIE_MAPPED) {
953                                 dma_unmap_sg(mmc_dev(host->mmc),
954                                         data->sg, data->sg_len,
955                                         (data->flags & MMC_DATA_READ) ?
956                                         DMA_FROM_DEVICE : DMA_TO_DEVICE);
957                                 data->host_cookie = COOKIE_UNMAPPED;
958                         }
959                 }
960         }
961 
962         /*
963          * The specification states that the block count register must
964          * be updated, but it does not specify at what point in the
965          * data flow. That makes the register entirely useless to read
966          * back so we have to assume that nothing made it to the card
967          * in the event of an error.
968          */
969         if (data->error)
970                 data->bytes_xfered = 0;
971         else
972                 data->bytes_xfered = data->blksz * data->blocks;
973 
974         /*
975          * Need to send CMD12 if -
976          * a) open-ended multiblock transfer (no CMD23)
977          * b) error in multiblock transfer
978          */
979         if (data->stop &&
980             (data->error ||
981              !host->mrq->sbc)) {
982 
983                 /*
984                  * The controller needs a reset of internal state machines
985                  * upon error conditions.
986                  */
987                 if (data->error) {
988                         sdhci_do_reset(host, SDHCI_RESET_CMD);
989                         sdhci_do_reset(host, SDHCI_RESET_DATA);
990                 }
991 
992                 sdhci_send_command(host, data->stop);
993         } else
994                 tasklet_schedule(&host->finish_tasklet);
995 }
996 
997 void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
998 {
999         int flags;
1000         u32 mask;
1001         unsigned long timeout;
1002 
1003         WARN_ON(host->cmd);
1004 
1005         /* Wait max 10 ms */
1006         timeout = 10;
1007 
1008         mask = SDHCI_CMD_INHIBIT;
1009         if ((cmd->data != NULL) || (cmd->flags & MMC_RSP_BUSY))
1010                 mask |= SDHCI_DATA_INHIBIT;
1011 
1012         /* We shouldn't wait for data inihibit for stop commands, even
1013            though they might use busy signaling */
1014         if (host->mrq->data && (cmd == host->mrq->data->stop))
1015                 mask &= ~SDHCI_DATA_INHIBIT;
1016 
1017         while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) {
1018                 if (timeout == 0) {
1019                         pr_err("%s: Controller never released "
1020                                 "inhibit bit(s).\n", mmc_hostname(host->mmc));
1021                         sdhci_dumpregs(host);
1022                         cmd->error = -EIO;
1023                         tasklet_schedule(&host->finish_tasklet);
1024                         return;
1025                 }
1026                 timeout--;
1027                 mdelay(1);
1028         }
1029 
1030         timeout = jiffies;
1031         if (!cmd->data && cmd->busy_timeout > 9000)
1032                 timeout += DIV_ROUND_UP(cmd->busy_timeout, 1000) * HZ + HZ;
1033         else
1034                 timeout += 10 * HZ;
1035         mod_timer(&host->timer, timeout);
1036 
1037         host->cmd = cmd;
1038         host->busy_handle = 0;
1039 
1040         sdhci_prepare_data(host, cmd);
1041 
1042         sdhci_writel(host, cmd->arg, SDHCI_ARGUMENT);
1043 
1044         sdhci_set_transfer_mode(host, cmd);
1045 
1046         if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
1047                 pr_err("%s: Unsupported response type!\n",
1048                         mmc_hostname(host->mmc));
1049                 cmd->error = -EINVAL;
1050                 tasklet_schedule(&host->finish_tasklet);
1051                 return;
1052         }
1053 
1054         if (!(cmd->flags & MMC_RSP_PRESENT))
1055                 flags = SDHCI_CMD_RESP_NONE;
1056         else if (cmd->flags & MMC_RSP_136)
1057                 flags = SDHCI_CMD_RESP_LONG;
1058         else if (cmd->flags & MMC_RSP_BUSY)
1059                 flags = SDHCI_CMD_RESP_SHORT_BUSY;
1060         else
1061                 flags = SDHCI_CMD_RESP_SHORT;
1062 
1063         if (cmd->flags & MMC_RSP_CRC)
1064                 flags |= SDHCI_CMD_CRC;
1065         if (cmd->flags & MMC_RSP_OPCODE)
1066                 flags |= SDHCI_CMD_INDEX;
1067 
1068         /* CMD19 is special in that the Data Present Select should be set */
1069         if (cmd->data || cmd->opcode == MMC_SEND_TUNING_BLOCK ||
1070             cmd->opcode == MMC_SEND_TUNING_BLOCK_HS200)
1071                 flags |= SDHCI_CMD_DATA;
1072 
1073         sdhci_writew(host, SDHCI_MAKE_CMD(cmd->opcode, flags), SDHCI_COMMAND);
1074 }
1075 EXPORT_SYMBOL_GPL(sdhci_send_command);
1076 
1077 static void sdhci_finish_command(struct sdhci_host *host)
1078 {
1079         int i;
1080 
1081         BUG_ON(host->cmd == NULL);
1082 
1083         if (host->cmd->flags & MMC_RSP_PRESENT) {
1084                 if (host->cmd->flags & MMC_RSP_136) {
1085                         /* CRC is stripped so we need to do some shifting. */
1086                         for (i = 0;i < 4;i++) {
1087                                 host->cmd->resp[i] = sdhci_readl(host,
1088                                         SDHCI_RESPONSE + (3-i)*4) << 8;
1089                                 if (i != 3)
1090                                         host->cmd->resp[i] |=
1091                                                 sdhci_readb(host,
1092                                                 SDHCI_RESPONSE + (3-i)*4-1);
1093                         }
1094                 } else {
1095                         host->cmd->resp[0] = sdhci_readl(host, SDHCI_RESPONSE);
1096                 }
1097         }
1098 
1099         host->cmd->error = 0;
1100 
1101         /* Finished CMD23, now send actual command. */
1102         if (host->cmd == host->mrq->sbc) {
1103                 host->cmd = NULL;
1104                 sdhci_send_command(host, host->mrq->cmd);
1105         } else {
1106 
1107                 /* Processed actual command. */
1108                 if (host->data && host->data_early)
1109                         sdhci_finish_data(host);
1110 
1111                 if (!host->cmd->data)
1112                         tasklet_schedule(&host->finish_tasklet);
1113 
1114                 host->cmd = NULL;
1115         }
1116 }
1117 
1118 static u16 sdhci_get_preset_value(struct sdhci_host *host)
1119 {
1120         u16 preset = 0;
1121 
1122         switch (host->timing) {
1123         case MMC_TIMING_UHS_SDR12:
1124                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR12);
1125                 break;
1126         case MMC_TIMING_UHS_SDR25:
1127                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR25);
1128                 break;
1129         case MMC_TIMING_UHS_SDR50:
1130                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR50);
1131                 break;
1132         case MMC_TIMING_UHS_SDR104:
1133         case MMC_TIMING_MMC_HS200:
1134                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR104);
1135                 break;
1136         case MMC_TIMING_UHS_DDR50:
1137         case MMC_TIMING_MMC_DDR52:
1138                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_DDR50);
1139                 break;
1140         case MMC_TIMING_MMC_HS400:
1141                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_HS400);
1142                 break;
1143         default:
1144                 pr_warn("%s: Invalid UHS-I mode selected\n",
1145                         mmc_hostname(host->mmc));
1146                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR12);
1147                 break;
1148         }
1149         return preset;
1150 }
1151 
1152 void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
1153 {
1154         int div = 0; /* Initialized for compiler warning */
1155         int real_div = div, clk_mul = 1;
1156         u16 clk = 0;
1157         unsigned long timeout;
1158         bool switch_base_clk = false;
1159 
1160         host->mmc->actual_clock = 0;
1161 
1162         sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
1163         if (host->quirks2 & SDHCI_QUIRK2_NEED_DELAY_AFTER_INT_CLK_RST)
1164                 mdelay(1);
1165 
1166         if (clock == 0)
1167                 return;
1168 
1169         if (host->version >= SDHCI_SPEC_300) {
1170                 if (host->preset_enabled) {
1171                         u16 pre_val;
1172 
1173                         clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1174                         pre_val = sdhci_get_preset_value(host);
1175                         div = (pre_val & SDHCI_PRESET_SDCLK_FREQ_MASK)
1176                                 >> SDHCI_PRESET_SDCLK_FREQ_SHIFT;
1177                         if (host->clk_mul &&
1178                                 (pre_val & SDHCI_PRESET_CLKGEN_SEL_MASK)) {
1179                                 clk = SDHCI_PROG_CLOCK_MODE;
1180                                 real_div = div + 1;
1181                                 clk_mul = host->clk_mul;
1182                         } else {
1183                                 real_div = max_t(int, 1, div << 1);
1184                         }
1185                         goto clock_set;
1186                 }
1187 
1188                 /*
1189                  * Check if the Host Controller supports Programmable Clock
1190                  * Mode.
1191                  */
1192                 if (host->clk_mul) {
1193                         for (div = 1; div <= 1024; div++) {
1194                                 if ((host->max_clk * host->clk_mul / div)
1195                                         <= clock)
1196                                         break;
1197                         }
1198                         if ((host->max_clk * host->clk_mul / div) <= clock) {
1199                                 /*
1200                                  * Set Programmable Clock Mode in the Clock
1201                                  * Control register.
1202                                  */
1203                                 clk = SDHCI_PROG_CLOCK_MODE;
1204                                 real_div = div;
1205                                 clk_mul = host->clk_mul;
1206                                 div--;
1207                         } else {
1208                                 /*
1209                                  * Divisor can be too small to reach clock
1210                                  * speed requirement. Then use the base clock.
1211                                  */
1212                                 switch_base_clk = true;
1213                         }
1214                 }
1215 
1216                 if (!host->clk_mul || switch_base_clk) {
1217                         /* Version 3.00 divisors must be a multiple of 2. */
1218                         if (host->max_clk <= clock)
1219                                 div = 1;
1220                         else {
1221                                 for (div = 2; div < SDHCI_MAX_DIV_SPEC_300;
1222                                      div += 2) {
1223                                         if ((host->max_clk / div) <= clock)
1224                                                 break;
1225                                 }
1226                         }
1227                         real_div = div;
1228                         div >>= 1;
1229                         if ((host->quirks2 & SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN)
1230                                 && !div && host->max_clk <= 25000000)
1231                                 div = 1;
1232                 }
1233         } else {
1234                 /* Version 2.00 divisors must be a power of 2. */
1235                 for (div = 1; div < SDHCI_MAX_DIV_SPEC_200; div *= 2) {
1236                         if ((host->max_clk / div) <= clock)
1237                                 break;
1238                 }
1239                 real_div = div;
1240                 div >>= 1;
1241         }
1242 
1243 clock_set:
1244         if (real_div)
1245                 host->mmc->actual_clock = (host->max_clk * clk_mul) / real_div;
1246         clk |= (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT;
1247         clk |= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN)
1248                 << SDHCI_DIVIDER_HI_SHIFT;
1249         clk |= SDHCI_CLOCK_INT_EN;
1250         sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1251 
1252         /* Wait max 20 ms */
1253         timeout = 20;
1254         while (!((clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL))
1255                 & SDHCI_CLOCK_INT_STABLE)) {
1256                 if (timeout == 0) {
1257                         pr_err("%s: Internal clock never "
1258                                 "stabilised.\n", mmc_hostname(host->mmc));
1259                         sdhci_dumpregs(host);
1260                         return;
1261                 }
1262                 timeout--;
1263                 mdelay(1);
1264         }
1265 
1266         clk |= SDHCI_CLOCK_CARD_EN;
1267         sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1268 }
1269 EXPORT_SYMBOL_GPL(sdhci_set_clock);
1270 
1271 static void sdhci_set_power(struct sdhci_host *host, unsigned char mode,
1272                             unsigned short vdd)
1273 {
1274         struct mmc_host *mmc = host->mmc;
1275         u8 pwr = 0;
1276 
1277         if (!IS_ERR(mmc->supply.vmmc)) {
1278                 spin_unlock_irq(&host->lock);
1279                 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
1280                 spin_lock_irq(&host->lock);
1281 
1282                 if (mode != MMC_POWER_OFF)
1283                         sdhci_writeb(host, SDHCI_POWER_ON, SDHCI_POWER_CONTROL);
1284                 else
1285                         sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
1286 
1287                 return;
1288         }
1289 
1290         if (mode != MMC_POWER_OFF) {
1291                 switch (1 << vdd) {
1292                 case MMC_VDD_165_195:
1293                         pwr = SDHCI_POWER_180;
1294                         break;
1295                 case MMC_VDD_29_30:
1296                 case MMC_VDD_30_31:
1297                         pwr = SDHCI_POWER_300;
1298                         break;
1299                 case MMC_VDD_32_33:
1300                 case MMC_VDD_33_34:
1301                         pwr = SDHCI_POWER_330;
1302                         break;
1303                 default:
1304                         BUG();
1305                 }
1306         }
1307 
1308         if (host->pwr == pwr)
1309                 return;
1310 
1311         host->pwr = pwr;
1312 
1313         if (pwr == 0) {
1314                 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
1315                 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
1316                         sdhci_runtime_pm_bus_off(host);
1317                 vdd = 0;
1318         } else {
1319                 /*
1320                  * Spec says that we should clear the power reg before setting
1321                  * a new value. Some controllers don't seem to like this though.
1322                  */
1323                 if (!(host->quirks & SDHCI_QUIRK_SINGLE_POWER_WRITE))
1324                         sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
1325 
1326                 /*
1327                  * At least the Marvell CaFe chip gets confused if we set the
1328                  * voltage and set turn on power at the same time, so set the
1329                  * voltage first.
1330                  */
1331                 if (host->quirks & SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER)
1332                         sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
1333 
1334                 pwr |= SDHCI_POWER_ON;
1335 
1336                 sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
1337 
1338                 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
1339                         sdhci_runtime_pm_bus_on(host);
1340 
1341                 /*
1342                  * Some controllers need an extra 10ms delay of 10ms before
1343                  * they can apply clock after applying power
1344                  */
1345                 if (host->quirks & SDHCI_QUIRK_DELAY_AFTER_POWER)
1346                         mdelay(10);
1347         }
1348 }
1349 
1350 /*****************************************************************************\
1351  *                                                                           *
1352  * MMC callbacks                                                             *
1353  *                                                                           *
1354 \*****************************************************************************/
1355 
1356 static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
1357 {
1358         struct sdhci_host *host;
1359         int present;
1360         unsigned long flags;
1361 
1362         host = mmc_priv(mmc);
1363 
1364         sdhci_runtime_pm_get(host);
1365 
1366         /* Firstly check card presence */
1367         present = sdhci_do_get_cd(host);
1368 
1369         spin_lock_irqsave(&host->lock, flags);
1370 
1371         WARN_ON(host->mrq != NULL);
1372 
1373 #ifndef SDHCI_USE_LEDS_CLASS
1374         sdhci_activate_led(host);
1375 #endif
1376 
1377         /*
1378          * Ensure we don't send the STOP for non-SET_BLOCK_COUNTED
1379          * requests if Auto-CMD12 is enabled.
1380          */
1381         if (!mrq->sbc && (host->flags & SDHCI_AUTO_CMD12)) {
1382                 if (mrq->stop) {
1383                         mrq->data->stop = NULL;
1384                         mrq->stop = NULL;
1385                 }
1386         }
1387 
1388         host->mrq = mrq;
1389 
1390         if (!present || host->flags & SDHCI_DEVICE_DEAD) {
1391                 host->mrq->cmd->error = -ENOMEDIUM;
1392                 tasklet_schedule(&host->finish_tasklet);
1393         } else {
1394                 if (mrq->sbc && !(host->flags & SDHCI_AUTO_CMD23))
1395                         sdhci_send_command(host, mrq->sbc);
1396                 else
1397                         sdhci_send_command(host, mrq->cmd);
1398         }
1399 
1400         mmiowb();
1401         spin_unlock_irqrestore(&host->lock, flags);
1402 }
1403 
1404 void sdhci_set_bus_width(struct sdhci_host *host, int width)
1405 {
1406         u8 ctrl;
1407 
1408         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
1409         if (width == MMC_BUS_WIDTH_8) {
1410                 ctrl &= ~SDHCI_CTRL_4BITBUS;
1411                 if (host->version >= SDHCI_SPEC_300)
1412                         ctrl |= SDHCI_CTRL_8BITBUS;
1413         } else {
1414                 if (host->version >= SDHCI_SPEC_300)
1415                         ctrl &= ~SDHCI_CTRL_8BITBUS;
1416                 if (width == MMC_BUS_WIDTH_4)
1417                         ctrl |= SDHCI_CTRL_4BITBUS;
1418                 else
1419                         ctrl &= ~SDHCI_CTRL_4BITBUS;
1420         }
1421         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1422 }
1423 EXPORT_SYMBOL_GPL(sdhci_set_bus_width);
1424 
1425 void sdhci_set_uhs_signaling(struct sdhci_host *host, unsigned timing)
1426 {
1427         u16 ctrl_2;
1428 
1429         ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1430         /* Select Bus Speed Mode for host */
1431         ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
1432         if ((timing == MMC_TIMING_MMC_HS200) ||
1433             (timing == MMC_TIMING_UHS_SDR104))
1434                 ctrl_2 |= SDHCI_CTRL_UHS_SDR104;
1435         else if (timing == MMC_TIMING_UHS_SDR12)
1436                 ctrl_2 |= SDHCI_CTRL_UHS_SDR12;
1437         else if (timing == MMC_TIMING_UHS_SDR25)
1438                 ctrl_2 |= SDHCI_CTRL_UHS_SDR25;
1439         else if (timing == MMC_TIMING_UHS_SDR50)
1440                 ctrl_2 |= SDHCI_CTRL_UHS_SDR50;
1441         else if ((timing == MMC_TIMING_UHS_DDR50) ||
1442                  (timing == MMC_TIMING_MMC_DDR52))
1443                 ctrl_2 |= SDHCI_CTRL_UHS_DDR50;
1444         else if (timing == MMC_TIMING_MMC_HS400)
1445                 ctrl_2 |= SDHCI_CTRL_HS400; /* Non-standard */
1446         sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
1447 }
1448 EXPORT_SYMBOL_GPL(sdhci_set_uhs_signaling);
1449 
1450 static void sdhci_do_set_ios(struct sdhci_host *host, struct mmc_ios *ios)
1451 {
1452         unsigned long flags;
1453         u8 ctrl;
1454         struct mmc_host *mmc = host->mmc;
1455 
1456         spin_lock_irqsave(&host->lock, flags);
1457 
1458         if (host->flags & SDHCI_DEVICE_DEAD) {
1459                 spin_unlock_irqrestore(&host->lock, flags);
1460                 if (!IS_ERR(mmc->supply.vmmc) &&
1461                     ios->power_mode == MMC_POWER_OFF)
1462                         mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
1463                 return;
1464         }
1465 
1466         /*
1467          * Reset the chip on each power off.
1468          * Should clear out any weird states.
1469          */
1470         if (ios->power_mode == MMC_POWER_OFF) {
1471                 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
1472                 sdhci_reinit(host);
1473         }
1474 
1475         if (host->version >= SDHCI_SPEC_300 &&
1476                 (ios->power_mode == MMC_POWER_UP) &&
1477                 !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN))
1478                 sdhci_enable_preset_value(host, false);
1479 
1480         if (!ios->clock || ios->clock != host->clock) {
1481                 host->ops->set_clock(host, ios->clock);
1482                 host->clock = ios->clock;
1483 
1484                 if (host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK &&
1485                     host->clock) {
1486                         host->timeout_clk = host->mmc->actual_clock ?
1487                                                 host->mmc->actual_clock / 1000 :
1488                                                 host->clock / 1000;
1489                         host->mmc->max_busy_timeout =
1490                                 host->ops->get_max_timeout_count ?
1491                                 host->ops->get_max_timeout_count(host) :
1492                                 1 << 27;
1493                         host->mmc->max_busy_timeout /= host->timeout_clk;
1494                 }
1495         }
1496 
1497         sdhci_set_power(host, ios->power_mode, ios->vdd);
1498 
1499         if (host->ops->platform_send_init_74_clocks)
1500                 host->ops->platform_send_init_74_clocks(host, ios->power_mode);
1501 
1502         host->ops->set_bus_width(host, ios->bus_width);
1503 
1504         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
1505 
1506         if ((ios->timing == MMC_TIMING_SD_HS ||
1507              ios->timing == MMC_TIMING_MMC_HS)
1508             && !(host->quirks & SDHCI_QUIRK_NO_HISPD_BIT))
1509                 ctrl |= SDHCI_CTRL_HISPD;
1510         else
1511                 ctrl &= ~SDHCI_CTRL_HISPD;
1512 
1513         if (host->version >= SDHCI_SPEC_300) {
1514                 u16 clk, ctrl_2;
1515 
1516                 /* In case of UHS-I modes, set High Speed Enable */
1517                 if ((ios->timing == MMC_TIMING_MMC_HS400) ||
1518                     (ios->timing == MMC_TIMING_MMC_HS200) ||
1519                     (ios->timing == MMC_TIMING_MMC_DDR52) ||
1520                     (ios->timing == MMC_TIMING_UHS_SDR50) ||
1521                     (ios->timing == MMC_TIMING_UHS_SDR104) ||
1522                     (ios->timing == MMC_TIMING_UHS_DDR50) ||
1523                     (ios->timing == MMC_TIMING_UHS_SDR25))
1524                         ctrl |= SDHCI_CTRL_HISPD;
1525 
1526                 if (!host->preset_enabled) {
1527                         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1528                         /*
1529                          * We only need to set Driver Strength if the
1530                          * preset value enable is not set.
1531                          */
1532                         ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1533                         ctrl_2 &= ~SDHCI_CTRL_DRV_TYPE_MASK;
1534                         if (ios->drv_type == MMC_SET_DRIVER_TYPE_A)
1535                                 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_A;
1536                         else if (ios->drv_type == MMC_SET_DRIVER_TYPE_B)
1537                                 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_B;
1538                         else if (ios->drv_type == MMC_SET_DRIVER_TYPE_C)
1539                                 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_C;
1540                         else if (ios->drv_type == MMC_SET_DRIVER_TYPE_D)
1541                                 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_D;
1542                         else {
1543                                 pr_warn("%s: invalid driver type, default to "
1544                                         "driver type B\n", mmc_hostname(mmc));
1545                                 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_B;
1546                         }
1547 
1548                         sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
1549                 } else {
1550                         /*
1551                          * According to SDHC Spec v3.00, if the Preset Value
1552                          * Enable in the Host Control 2 register is set, we
1553                          * need to reset SD Clock Enable before changing High
1554                          * Speed Enable to avoid generating clock gliches.
1555                          */
1556 
1557                         /* Reset SD Clock Enable */
1558                         clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1559                         clk &= ~SDHCI_CLOCK_CARD_EN;
1560                         sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1561 
1562                         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1563 
1564                         /* Re-enable SD Clock */
1565                         host->ops->set_clock(host, host->clock);
1566                 }
1567 
1568                 /* Reset SD Clock Enable */
1569                 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1570                 clk &= ~SDHCI_CLOCK_CARD_EN;
1571                 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1572 
1573                 host->ops->set_uhs_signaling(host, ios->timing);
1574                 host->timing = ios->timing;
1575 
1576                 if (!(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN) &&
1577                                 ((ios->timing == MMC_TIMING_UHS_SDR12) ||
1578                                  (ios->timing == MMC_TIMING_UHS_SDR25) ||
1579                                  (ios->timing == MMC_TIMING_UHS_SDR50) ||
1580                                  (ios->timing == MMC_TIMING_UHS_SDR104) ||
1581                                  (ios->timing == MMC_TIMING_UHS_DDR50) ||
1582                                  (ios->timing == MMC_TIMING_MMC_DDR52))) {
1583                         u16 preset;
1584 
1585                         sdhci_enable_preset_value(host, true);
1586                         preset = sdhci_get_preset_value(host);
1587                         ios->drv_type = (preset & SDHCI_PRESET_DRV_MASK)
1588                                 >> SDHCI_PRESET_DRV_SHIFT;
1589                 }
1590 
1591                 /* Re-enable SD Clock */
1592                 host->ops->set_clock(host, host->clock);
1593         } else
1594                 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1595 
1596         /*
1597          * Some (ENE) controllers go apeshit on some ios operation,
1598          * signalling timeout and CRC errors even on CMD0. Resetting
1599          * it on each ios seems to solve the problem.
1600          */
1601         if (host->quirks & SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS)
1602                 sdhci_do_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
1603 
1604         mmiowb();
1605         spin_unlock_irqrestore(&host->lock, flags);
1606 }
1607 
1608 static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1609 {
1610         struct sdhci_host *host = mmc_priv(mmc);
1611 
1612         sdhci_runtime_pm_get(host);
1613         sdhci_do_set_ios(host, ios);
1614         sdhci_runtime_pm_put(host);
1615 }
1616 
1617 static int sdhci_do_get_cd(struct sdhci_host *host)
1618 {
1619         int gpio_cd = mmc_gpio_get_cd(host->mmc);
1620 
1621         if (host->flags & SDHCI_DEVICE_DEAD)
1622                 return 0;
1623 
1624         /* If nonremovable, assume that the card is always present. */
1625         if (host->mmc->caps & MMC_CAP_NONREMOVABLE)
1626                 return 1;
1627 
1628         /*
1629          * Try slot gpio detect, if defined it take precedence
1630          * over build in controller functionality
1631          */
1632         if (!IS_ERR_VALUE(gpio_cd))
1633                 return !!gpio_cd;
1634 
1635         /* If polling, assume that the card is always present. */
1636         if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
1637                 return 1;
1638 
1639         /* Host native card detect */
1640         return !!(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT);
1641 }
1642 
1643 static int sdhci_get_cd(struct mmc_host *mmc)
1644 {
1645         struct sdhci_host *host = mmc_priv(mmc);
1646         int ret;
1647 
1648         sdhci_runtime_pm_get(host);
1649         ret = sdhci_do_get_cd(host);
1650         sdhci_runtime_pm_put(host);
1651         return ret;
1652 }
1653 
1654 static int sdhci_check_ro(struct sdhci_host *host)
1655 {
1656         unsigned long flags;
1657         int is_readonly;
1658 
1659         spin_lock_irqsave(&host->lock, flags);
1660 
1661         if (host->flags & SDHCI_DEVICE_DEAD)
1662                 is_readonly = 0;
1663         else if (host->ops->get_ro)
1664                 is_readonly = host->ops->get_ro(host);
1665         else
1666                 is_readonly = !(sdhci_readl(host, SDHCI_PRESENT_STATE)
1667                                 & SDHCI_WRITE_PROTECT);
1668 
1669         spin_unlock_irqrestore(&host->lock, flags);
1670 
1671         /* This quirk needs to be replaced by a callback-function later */
1672         return host->quirks & SDHCI_QUIRK_INVERTED_WRITE_PROTECT ?
1673                 !is_readonly : is_readonly;
1674 }
1675 
1676 #define SAMPLE_COUNT    5
1677 
1678 static int sdhci_do_get_ro(struct sdhci_host *host)
1679 {
1680         int i, ro_count;
1681 
1682         if (!(host->quirks & SDHCI_QUIRK_UNSTABLE_RO_DETECT))
1683                 return sdhci_check_ro(host);
1684 
1685         ro_count = 0;
1686         for (i = 0; i < SAMPLE_COUNT; i++) {
1687                 if (sdhci_check_ro(host)) {
1688                         if (++ro_count > SAMPLE_COUNT / 2)
1689                                 return 1;
1690                 }
1691                 msleep(30);
1692         }
1693         return 0;
1694 }
1695 
1696 static void sdhci_hw_reset(struct mmc_host *mmc)
1697 {
1698         struct sdhci_host *host = mmc_priv(mmc);
1699 
1700         if (host->ops && host->ops->hw_reset)
1701                 host->ops->hw_reset(host);
1702 }
1703 
1704 static int sdhci_get_ro(struct mmc_host *mmc)
1705 {
1706         struct sdhci_host *host = mmc_priv(mmc);
1707         int ret;
1708 
1709         sdhci_runtime_pm_get(host);
1710         ret = sdhci_do_get_ro(host);
1711         sdhci_runtime_pm_put(host);
1712         return ret;
1713 }
1714 
1715 static void sdhci_enable_sdio_irq_nolock(struct sdhci_host *host, int enable)
1716 {
1717         if (!(host->flags & SDHCI_DEVICE_DEAD)) {
1718                 if (enable)
1719                         host->ier |= SDHCI_INT_CARD_INT;
1720                 else
1721                         host->ier &= ~SDHCI_INT_CARD_INT;
1722 
1723                 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
1724                 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
1725                 mmiowb();
1726         }
1727 }
1728 
1729 static void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable)
1730 {
1731         struct sdhci_host *host = mmc_priv(mmc);
1732         unsigned long flags;
1733 
1734         sdhci_runtime_pm_get(host);
1735 
1736         spin_lock_irqsave(&host->lock, flags);
1737         if (enable)
1738                 host->flags |= SDHCI_SDIO_IRQ_ENABLED;
1739         else
1740                 host->flags &= ~SDHCI_SDIO_IRQ_ENABLED;
1741 
1742         sdhci_enable_sdio_irq_nolock(host, enable);
1743         spin_unlock_irqrestore(&host->lock, flags);
1744 
1745         sdhci_runtime_pm_put(host);
1746 }
1747 
1748 static int sdhci_do_start_signal_voltage_switch(struct sdhci_host *host,
1749                                                 struct mmc_ios *ios)
1750 {
1751         struct mmc_host *mmc = host->mmc;
1752         u16 ctrl;
1753         int ret;
1754 
1755         /*
1756          * Signal Voltage Switching is only applicable for Host Controllers
1757          * v3.00 and above.
1758          */
1759         if (host->version < SDHCI_SPEC_300)
1760                 return 0;
1761 
1762         ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1763 
1764         switch (ios->signal_voltage) {
1765         case MMC_SIGNAL_VOLTAGE_330:
1766                 /* Set 1.8V Signal Enable in the Host Control2 register to 0 */
1767                 ctrl &= ~SDHCI_CTRL_VDD_180;
1768                 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1769 
1770                 if (!IS_ERR(mmc->supply.vqmmc)) {
1771                         ret = regulator_set_voltage(mmc->supply.vqmmc, 2700000,
1772                                                     3600000);
1773                         if (ret) {
1774                                 pr_warn("%s: Switching to 3.3V signalling voltage failed\n",
1775                                         mmc_hostname(mmc));
1776                                 return -EIO;
1777                         }
1778                 }
1779                 /* Wait for 5ms */
1780                 usleep_range(5000, 5500);
1781 
1782                 /* 3.3V regulator output should be stable within 5 ms */
1783                 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1784                 if (!(ctrl & SDHCI_CTRL_VDD_180))
1785                         return 0;
1786 
1787                 pr_warn("%s: 3.3V regulator output did not became stable\n",
1788                         mmc_hostname(mmc));
1789 
1790                 return -EAGAIN;
1791         case MMC_SIGNAL_VOLTAGE_180:
1792                 if (!IS_ERR(mmc->supply.vqmmc)) {
1793                         ret = regulator_set_voltage(mmc->supply.vqmmc,
1794                                         1700000, 1950000);
1795                         if (ret) {
1796                                 pr_warn("%s: Switching to 1.8V signalling voltage failed\n",
1797                                         mmc_hostname(mmc));
1798                                 return -EIO;
1799                         }
1800                 }
1801 
1802                 /*
1803                  * Enable 1.8V Signal Enable in the Host Control2
1804                  * register
1805                  */
1806                 ctrl |= SDHCI_CTRL_VDD_180;
1807                 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1808 
1809                 /* Some controller need to do more when switching */
1810                 if (host->ops->voltage_switch)
1811                         host->ops->voltage_switch(host);
1812 
1813                 /* 1.8V regulator output should be stable within 5 ms */
1814                 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1815                 if (ctrl & SDHCI_CTRL_VDD_180)
1816                         return 0;
1817 
1818                 pr_warn("%s: 1.8V regulator output did not became stable\n",
1819                         mmc_hostname(mmc));
1820 
1821                 return -EAGAIN;
1822         case MMC_SIGNAL_VOLTAGE_120:
1823                 if (!IS_ERR(mmc->supply.vqmmc)) {
1824                         ret = regulator_set_voltage(mmc->supply.vqmmc, 1100000,
1825                                                     1300000);
1826                         if (ret) {
1827                                 pr_warn("%s: Switching to 1.2V signalling voltage failed\n",
1828                                         mmc_hostname(mmc));
1829                                 return -EIO;
1830                         }
1831                 }
1832                 return 0;
1833         default:
1834                 /* No signal voltage switch required */
1835                 return 0;
1836         }
1837 }
1838 
1839 static int sdhci_start_signal_voltage_switch(struct mmc_host *mmc,
1840         struct mmc_ios *ios)
1841 {
1842         struct sdhci_host *host = mmc_priv(mmc);
1843         int err;
1844 
1845         if (host->version < SDHCI_SPEC_300)
1846                 return 0;
1847         sdhci_runtime_pm_get(host);
1848         err = sdhci_do_start_signal_voltage_switch(host, ios);
1849         sdhci_runtime_pm_put(host);
1850         return err;
1851 }
1852 
1853 static int sdhci_card_busy(struct mmc_host *mmc)
1854 {
1855         struct sdhci_host *host = mmc_priv(mmc);
1856         u32 present_state;
1857 
1858         sdhci_runtime_pm_get(host);
1859         /* Check whether DAT[3:0] is 0000 */
1860         present_state = sdhci_readl(host, SDHCI_PRESENT_STATE);
1861         sdhci_runtime_pm_put(host);
1862 
1863         return !(present_state & SDHCI_DATA_LVL_MASK);
1864 }
1865 
1866 static int sdhci_prepare_hs400_tuning(struct mmc_host *mmc, struct mmc_ios *ios)
1867 {
1868         struct sdhci_host *host = mmc_priv(mmc);
1869         unsigned long flags;
1870 
1871         spin_lock_irqsave(&host->lock, flags);
1872         host->flags |= SDHCI_HS400_TUNING;
1873         spin_unlock_irqrestore(&host->lock, flags);
1874 
1875         return 0;
1876 }
1877 
1878 static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
1879 {
1880         struct sdhci_host *host = mmc_priv(mmc);
1881         u16 ctrl;
1882         int tuning_loop_counter = MAX_TUNING_LOOP;
1883         int err = 0;
1884         unsigned long flags;
1885         unsigned int tuning_count = 0;
1886         bool hs400_tuning;
1887 
1888         sdhci_runtime_pm_get(host);
1889         spin_lock_irqsave(&host->lock, flags);
1890 
1891         hs400_tuning = host->flags & SDHCI_HS400_TUNING;
1892         host->flags &= ~SDHCI_HS400_TUNING;
1893 
1894         if (host->tuning_mode == SDHCI_TUNING_MODE_1)
1895                 tuning_count = host->tuning_count;
1896 
1897         /*
1898          * The Host Controller needs tuning in case of SDR104 and DDR50
1899          * mode, and for SDR50 mode when Use Tuning for SDR50 is set in
1900          * the Capabilities register.
1901          * If the Host Controller supports the HS200 mode then the
1902          * tuning function has to be executed.
1903          */
1904         switch (host->timing) {
1905         /* HS400 tuning is done in HS200 mode */
1906         case MMC_TIMING_MMC_HS400:
1907                 err = -EINVAL;
1908                 goto out_unlock;
1909 
1910         case MMC_TIMING_MMC_HS200:
1911                 /*
1912                  * Periodic re-tuning for HS400 is not expected to be needed, so
1913                  * disable it here.
1914                  */
1915                 if (hs400_tuning)
1916                         tuning_count = 0;
1917                 break;
1918 
1919         case MMC_TIMING_UHS_SDR104:
1920         case MMC_TIMING_UHS_DDR50:
1921                 break;
1922 
1923         case MMC_TIMING_UHS_SDR50:
1924                 if (host->flags & SDHCI_SDR50_NEEDS_TUNING ||
1925                     host->flags & SDHCI_SDR104_NEEDS_TUNING)
1926                         break;
1927                 /* FALLTHROUGH */
1928 
1929         default:
1930                 goto out_unlock;
1931         }
1932 
1933         if (host->ops->platform_execute_tuning) {
1934                 spin_unlock_irqrestore(&host->lock, flags);
1935                 err = host->ops->platform_execute_tuning(host, opcode);
1936                 sdhci_runtime_pm_put(host);
1937                 return err;
1938         }
1939 
1940         ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1941         ctrl |= SDHCI_CTRL_EXEC_TUNING;
1942         if (host->quirks2 & SDHCI_QUIRK2_TUNING_WORK_AROUND)
1943                 ctrl |= SDHCI_CTRL_TUNED_CLK;
1944         sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1945 
1946         /*
1947          * As per the Host Controller spec v3.00, tuning command
1948          * generates Buffer Read Ready interrupt, so enable that.
1949          *
1950          * Note: The spec clearly says that when tuning sequence
1951          * is being performed, the controller does not generate
1952          * interrupts other than Buffer Read Ready interrupt. But
1953          * to make sure we don't hit a controller bug, we _only_
1954          * enable Buffer Read Ready interrupt here.
1955          */
1956         sdhci_writel(host, SDHCI_INT_DATA_AVAIL, SDHCI_INT_ENABLE);
1957         sdhci_writel(host, SDHCI_INT_DATA_AVAIL, SDHCI_SIGNAL_ENABLE);
1958 
1959         /*
1960          * Issue CMD19 repeatedly till Execute Tuning is set to 0 or the number
1961          * of loops reaches 40 times or a timeout of 150ms occurs.
1962          */
1963         do {
1964                 struct mmc_command cmd = {0};
1965                 struct mmc_request mrq = {NULL};
1966 
1967                 cmd.opcode = opcode;
1968                 cmd.arg = 0;
1969                 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
1970                 cmd.retries = 0;
1971                 cmd.data = NULL;
1972                 cmd.error = 0;
1973 
1974                 if (tuning_loop_counter-- == 0)
1975                         break;
1976 
1977                 mrq.cmd = &cmd;
1978                 host->mrq = &mrq;
1979 
1980                 /*
1981                  * In response to CMD19, the card sends 64 bytes of tuning
1982                  * block to the Host Controller. So we set the block size
1983                  * to 64 here.
1984                  */
1985                 if (cmd.opcode == MMC_SEND_TUNING_BLOCK_HS200) {
1986                         if (mmc->ios.bus_width == MMC_BUS_WIDTH_8)
1987                                 sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, 128),
1988                                              SDHCI_BLOCK_SIZE);
1989                         else if (mmc->ios.bus_width == MMC_BUS_WIDTH_4)
1990                                 sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, 64),
1991                                              SDHCI_BLOCK_SIZE);
1992                 } else {
1993                         sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, 64),
1994                                      SDHCI_BLOCK_SIZE);
1995                 }
1996 
1997                 /*
1998                  * The tuning block is sent by the card to the host controller.
1999                  * So we set the TRNS_READ bit in the Transfer Mode register.
2000                  * This also takes care of setting DMA Enable and Multi Block
2001                  * Select in the same register to 0.
2002                  */
2003                 sdhci_writew(host, SDHCI_TRNS_READ, SDHCI_TRANSFER_MODE);
2004 
2005                 sdhci_send_command(host, &cmd);
2006 
2007                 host->cmd = NULL;
2008                 host->mrq = NULL;
2009 
2010                 spin_unlock_irqrestore(&host->lock, flags);
2011                 /* Wait for Buffer Read Ready interrupt */
2012                 wait_event_interruptible_timeout(host->buf_ready_int,
2013                                         (host->tuning_done == 1),
2014                                         msecs_to_jiffies(50));
2015                 spin_lock_irqsave(&host->lock, flags);
2016 
2017                 if (!host->tuning_done) {
2018                         pr_info(DRIVER_NAME ": Timeout waiting for "
2019                                 "Buffer Read Ready interrupt during tuning "
2020                                 "procedure, falling back to fixed sampling "
2021                                 "clock\n");
2022                         ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2023                         ctrl &= ~SDHCI_CTRL_TUNED_CLK;
2024                         ctrl &= ~SDHCI_CTRL_EXEC_TUNING;
2025                         sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2026 
2027                         err = -EIO;
2028                         goto out;
2029                 }
2030 
2031                 host->tuning_done = 0;
2032 
2033                 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2034 
2035                 /* eMMC spec does not require a delay between tuning cycles */
2036                 if (opcode == MMC_SEND_TUNING_BLOCK)
2037                         mdelay(1);
2038         } while (ctrl & SDHCI_CTRL_EXEC_TUNING);
2039 
2040         /*
2041          * The Host Driver has exhausted the maximum number of loops allowed,
2042          * so use fixed sampling frequency.
2043          */
2044         if (tuning_loop_counter < 0) {
2045                 ctrl &= ~SDHCI_CTRL_TUNED_CLK;
2046                 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2047         }
2048         if (!(ctrl & SDHCI_CTRL_TUNED_CLK)) {
2049                 pr_info(DRIVER_NAME ": Tuning procedure"
2050                         " failed, falling back to fixed sampling"
2051                         " clock\n");
2052                 err = -EIO;
2053         }
2054 
2055 out:
2056         if (tuning_count) {
2057                 /*
2058                  * In case tuning fails, host controllers which support
2059                  * re-tuning can try tuning again at a later time, when the
2060                  * re-tuning timer expires.  So for these controllers, we
2061                  * return 0. Since there might be other controllers who do not
2062                  * have this capability, we return error for them.
2063                  */
2064                 err = 0;
2065         }
2066 
2067         host->mmc->retune_period = err ? 0 : tuning_count;
2068 
2069         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
2070         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
2071 out_unlock:
2072         spin_unlock_irqrestore(&host->lock, flags);
2073         sdhci_runtime_pm_put(host);
2074 
2075         return err;
2076 }
2077 
2078 static int sdhci_select_drive_strength(struct mmc_card *card,
2079                                        unsigned int max_dtr, int host_drv,
2080                                        int card_drv, int *drv_type)
2081 {
2082         struct sdhci_host *host = mmc_priv(card->host);
2083 
2084         if (!host->ops->select_drive_strength)
2085                 return 0;
2086 
2087         return host->ops->select_drive_strength(host, card, max_dtr, host_drv,
2088                                                 card_drv, drv_type);
2089 }
2090 
2091 static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable)
2092 {
2093         /* Host Controller v3.00 defines preset value registers */
2094         if (host->version < SDHCI_SPEC_300)
2095                 return;
2096 
2097         /*
2098          * We only enable or disable Preset Value if they are not already
2099          * enabled or disabled respectively. Otherwise, we bail out.
2100          */
2101         if (host->preset_enabled != enable) {
2102                 u16 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2103 
2104                 if (enable)
2105                         ctrl |= SDHCI_CTRL_PRESET_VAL_ENABLE;
2106                 else
2107                         ctrl &= ~SDHCI_CTRL_PRESET_VAL_ENABLE;
2108 
2109                 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2110 
2111                 if (enable)
2112                         host->flags |= SDHCI_PV_ENABLED;
2113                 else
2114                         host->flags &= ~SDHCI_PV_ENABLED;
2115 
2116                 host->preset_enabled = enable;
2117         }
2118 }
2119 
2120 static void sdhci_post_req(struct mmc_host *mmc, struct mmc_request *mrq,
2121                                 int err)
2122 {
2123         struct sdhci_host *host = mmc_priv(mmc);
2124         struct mmc_data *data = mrq->data;
2125 
2126         if (host->flags & SDHCI_REQ_USE_DMA) {
2127                 if (data->host_cookie == COOKIE_GIVEN ||
2128                                 data->host_cookie == COOKIE_MAPPED)
2129                         dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
2130                                          data->flags & MMC_DATA_WRITE ?
2131                                          DMA_TO_DEVICE : DMA_FROM_DEVICE);
2132                 data->host_cookie = COOKIE_UNMAPPED;
2133         }
2134 }
2135 
2136 static int sdhci_pre_dma_transfer(struct sdhci_host *host,
2137                                        struct mmc_data *data)
2138 {
2139         int sg_count;
2140 
2141         if (data->host_cookie == COOKIE_MAPPED) {
2142                 data->host_cookie = COOKIE_GIVEN;
2143                 return data->sg_count;
2144         }
2145 
2146         WARN_ON(data->host_cookie == COOKIE_GIVEN);
2147 
2148         sg_count = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
2149                                 data->flags & MMC_DATA_WRITE ?
2150                                 DMA_TO_DEVICE : DMA_FROM_DEVICE);
2151 
2152         if (sg_count == 0)
2153                 return -ENOSPC;
2154 
2155         data->sg_count = sg_count;
2156         data->host_cookie = COOKIE_MAPPED;
2157 
2158         return sg_count;
2159 }
2160 
2161 static void sdhci_pre_req(struct mmc_host *mmc, struct mmc_request *mrq,
2162                                bool is_first_req)
2163 {
2164         struct sdhci_host *host = mmc_priv(mmc);
2165 
2166         mrq->data->host_cookie = COOKIE_UNMAPPED;
2167 
2168         if (host->flags & SDHCI_REQ_USE_DMA)
2169                 sdhci_pre_dma_transfer(host, mrq->data);
2170 }
2171 
2172 static void sdhci_card_event(struct mmc_host *mmc)
2173 {
2174         struct sdhci_host *host = mmc_priv(mmc);
2175         unsigned long flags;
2176         int present;
2177 
2178         /* First check if client has provided their own card event */
2179         if (host->ops->card_event)
2180                 host->ops->card_event(host);
2181 
2182         present = sdhci_do_get_cd(host);
2183 
2184         spin_lock_irqsave(&host->lock, flags);
2185 
2186         /* Check host->mrq first in case we are runtime suspended */
2187         if (host->mrq && !present) {
2188                 pr_err("%s: Card removed during transfer!\n",
2189                         mmc_hostname(host->mmc));
2190                 pr_err("%s: Resetting controller.\n",
2191                         mmc_hostname(host->mmc));
2192 
2193                 sdhci_do_reset(host, SDHCI_RESET_CMD);
2194                 sdhci_do_reset(host, SDHCI_RESET_DATA);
2195 
2196                 host->mrq->cmd->error = -ENOMEDIUM;
2197                 tasklet_schedule(&host->finish_tasklet);
2198         }
2199 
2200         spin_unlock_irqrestore(&host->lock, flags);
2201 }
2202 
2203 static const struct mmc_host_ops sdhci_ops = {
2204         .request        = sdhci_request,
2205         .post_req       = sdhci_post_req,
2206         .pre_req        = sdhci_pre_req,
2207         .set_ios        = sdhci_set_ios,
2208         .get_cd         = sdhci_get_cd,
2209         .get_ro         = sdhci_get_ro,
2210         .hw_reset       = sdhci_hw_reset,
2211         .enable_sdio_irq = sdhci_enable_sdio_irq,
2212         .start_signal_voltage_switch    = sdhci_start_signal_voltage_switch,
2213         .prepare_hs400_tuning           = sdhci_prepare_hs400_tuning,
2214         .execute_tuning                 = sdhci_execute_tuning,
2215         .select_drive_strength          = sdhci_select_drive_strength,
2216         .card_event                     = sdhci_card_event,
2217         .card_busy      = sdhci_card_busy,
2218 };
2219 
2220 /*****************************************************************************\
2221  *                                                                           *
2222  * Tasklets                                                                  *
2223  *                                                                           *
2224 \*****************************************************************************/
2225 
2226 static void sdhci_tasklet_finish(unsigned long param)
2227 {
2228         struct sdhci_host *host;
2229         unsigned long flags;
2230         struct mmc_request *mrq;
2231 
2232         host = (struct sdhci_host*)param;
2233 
2234         spin_lock_irqsave(&host->lock, flags);
2235 
2236         /*
2237          * If this tasklet gets rescheduled while running, it will
2238          * be run again afterwards but without any active request.
2239          */
2240         if (!host->mrq) {
2241                 spin_unlock_irqrestore(&host->lock, flags);
2242                 return;
2243         }
2244 
2245         del_timer(&host->timer);
2246 
2247         mrq = host->mrq;
2248 
2249         /*
2250          * The controller needs a reset of internal state machines
2251          * upon error conditions.
2252          */
2253         if (!(host->flags & SDHCI_DEVICE_DEAD) &&
2254             ((mrq->cmd && mrq->cmd->error) ||
2255              (mrq->sbc && mrq->sbc->error) ||
2256              (mrq->data && ((mrq->data->error && !mrq->data->stop) ||
2257                             (mrq->data->stop && mrq->data->stop->error))) ||
2258              (host->quirks & SDHCI_QUIRK_RESET_AFTER_REQUEST))) {
2259 
2260                 /* Some controllers need this kick or reset won't work here */
2261                 if (host->quirks & SDHCI_QUIRK_CLOCK_BEFORE_RESET)
2262                         /* This is to force an update */
2263                         host->ops->set_clock(host, host->clock);
2264 
2265                 /* Spec says we should do both at the same time, but Ricoh
2266                    controllers do not like that. */
2267                 sdhci_do_reset(host, SDHCI_RESET_CMD);
2268                 sdhci_do_reset(host, SDHCI_RESET_DATA);
2269         }
2270 
2271         host->mrq = NULL;
2272         host->cmd = NULL;
2273         host->data = NULL;
2274 
2275 #ifndef SDHCI_USE_LEDS_CLASS
2276         sdhci_deactivate_led(host);
2277 #endif
2278 
2279         mmiowb();
2280         spin_unlock_irqrestore(&host->lock, flags);
2281 
2282         mmc_request_done(host->mmc, mrq);
2283         sdhci_runtime_pm_put(host);
2284 }
2285 
2286 static void sdhci_timeout_timer(unsigned long data)
2287 {
2288         struct sdhci_host *host;
2289         unsigned long flags;
2290 
2291         host = (struct sdhci_host*)data;
2292 
2293         spin_lock_irqsave(&host->lock, flags);
2294 
2295         if (host->mrq) {
2296                 pr_err("%s: Timeout waiting for hardware "
2297                         "interrupt.\n", mmc_hostname(host->mmc));
2298                 sdhci_dumpregs(host);
2299 
2300                 if (host->data) {
2301                         host->data->error = -ETIMEDOUT;
2302                         sdhci_finish_data(host);
2303                 } else {
2304                         if (host->cmd)
2305                                 host->cmd->error = -ETIMEDOUT;
2306                         else
2307                                 host->mrq->cmd->error = -ETIMEDOUT;
2308 
2309                         tasklet_schedule(&host->finish_tasklet);
2310                 }
2311         }
2312 
2313         mmiowb();
2314         spin_unlock_irqrestore(&host->lock, flags);
2315 }
2316 
2317 /*****************************************************************************\
2318  *                                                                           *
2319  * Interrupt handling                                                        *
2320  *                                                                           *
2321 \*****************************************************************************/
2322 
2323 static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask, u32 *mask)
2324 {
2325         BUG_ON(intmask == 0);
2326 
2327         if (!host->cmd) {
2328                 pr_err("%s: Got command interrupt 0x%08x even "
2329                         "though no command operation was in progress.\n",
2330                         mmc_hostname(host->mmc), (unsigned)intmask);
2331                 sdhci_dumpregs(host);
2332                 return;
2333         }
2334 
2335         if (intmask & SDHCI_INT_TIMEOUT)
2336                 host->cmd->error = -ETIMEDOUT;
2337         else if (intmask & (SDHCI_INT_CRC | SDHCI_INT_END_BIT |
2338                         SDHCI_INT_INDEX))
2339                 host->cmd->error = -EILSEQ;
2340 
2341         if (host->cmd->error) {
2342                 tasklet_schedule(&host->finish_tasklet);
2343                 return;
2344         }
2345 
2346         /*
2347          * The host can send and interrupt when the busy state has
2348          * ended, allowing us to wait without wasting CPU cycles.
2349          * Unfortunately this is overloaded on the "data complete"
2350          * interrupt, so we need to take some care when handling
2351          * it.
2352          *
2353          * Note: The 1.0 specification is a bit ambiguous about this
2354          *       feature so there might be some problems with older
2355          *       controllers.
2356          */
2357         if (host->cmd->flags & MMC_RSP_BUSY) {
2358                 if (host->cmd->data)
2359                         DBG("Cannot wait for busy signal when also "
2360                                 "doing a data transfer");
2361                 else if (!(host->quirks & SDHCI_QUIRK_NO_BUSY_IRQ)
2362                                 && !host->busy_handle) {
2363                         /* Mark that command complete before busy is ended */
2364                         host->busy_handle = 1;
2365                         return;
2366                 }
2367 
2368                 /* The controller does not support the end-of-busy IRQ,
2369                  * fall through and take the SDHCI_INT_RESPONSE */
2370         } else if ((host->quirks2 & SDHCI_QUIRK2_STOP_WITH_TC) &&
2371                    host->cmd->opcode == MMC_STOP_TRANSMISSION && !host->data) {
2372                 *mask &= ~SDHCI_INT_DATA_END;
2373         }
2374 
2375         if (intmask & SDHCI_INT_RESPONSE)
2376                 sdhci_finish_command(host);
2377 }
2378 
2379 #ifdef CONFIG_MMC_DEBUG
2380 static void sdhci_adma_show_error(struct sdhci_host *host)
2381 {
2382         const char *name = mmc_hostname(host->mmc);
2383         void *desc = host->adma_table;
2384 
2385         sdhci_dumpregs(host);
2386 
2387         while (true) {
2388                 struct sdhci_adma2_64_desc *dma_desc = desc;
2389 
2390                 if (host->flags & SDHCI_USE_64_BIT_DMA)
2391                         DBG("%s: %p: DMA 0x%08x%08x, LEN 0x%04x, Attr=0x%02x\n",
2392                             name, desc, le32_to_cpu(dma_desc->addr_hi),
2393                             le32_to_cpu(dma_desc->addr_lo),
2394                             le16_to_cpu(dma_desc->len),
2395                             le16_to_cpu(dma_desc->cmd));
2396                 else
2397                         DBG("%s: %p: DMA 0x%08x, LEN 0x%04x, Attr=0x%02x\n",
2398                             name, desc, le32_to_cpu(dma_desc->addr_lo),
2399                             le16_to_cpu(dma_desc->len),
2400                             le16_to_cpu(dma_desc->cmd));
2401 
2402                 desc += host->desc_sz;
2403 
2404                 if (dma_desc->cmd & cpu_to_le16(ADMA2_END))
2405                         break;
2406         }
2407 }
2408 #else
2409 static void sdhci_adma_show_error(struct sdhci_host *host) { }
2410 #endif
2411 
2412 static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
2413 {
2414         u32 command;
2415         BUG_ON(intmask == 0);
2416 
2417         /* CMD19 generates _only_ Buffer Read Ready interrupt */
2418         if (intmask & SDHCI_INT_DATA_AVAIL) {
2419                 command = SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND));
2420                 if (command == MMC_SEND_TUNING_BLOCK ||
2421                     command == MMC_SEND_TUNING_BLOCK_HS200) {
2422                         host->tuning_done = 1;
2423                         wake_up(&host->buf_ready_int);
2424                         return;
2425                 }
2426         }
2427 
2428         if (!host->data) {
2429                 /*
2430                  * The "data complete" interrupt is also used to
2431                  * indicate that a busy state has ended. See comment
2432                  * above in sdhci_cmd_irq().
2433                  */
2434                 if (host->cmd && (host->cmd->flags & MMC_RSP_BUSY)) {
2435                         if (intmask & SDHCI_INT_DATA_TIMEOUT) {
2436                                 host->cmd->error = -ETIMEDOUT;
2437                                 tasklet_schedule(&host->finish_tasklet);
2438                                 return;
2439                         }
2440                         if (intmask & SDHCI_INT_DATA_END) {
2441                                 /*
2442                                  * Some cards handle busy-end interrupt
2443                                  * before the command completed, so make
2444                                  * sure we do things in the proper order.
2445                                  */
2446                                 if (host->busy_handle)
2447                                         sdhci_finish_command(host);
2448                                 else
2449                                         host->busy_handle = 1;
2450                                 return;
2451                         }
2452                 }
2453 
2454                 pr_err("%s: Got data interrupt 0x%08x even "
2455                         "though no data operation was in progress.\n",
2456                         mmc_hostname(host->mmc), (unsigned)intmask);
2457                 sdhci_dumpregs(host);
2458 
2459                 return;
2460         }
2461 
2462         if (intmask & SDHCI_INT_DATA_TIMEOUT)
2463                 host->data->error = -ETIMEDOUT;
2464         else if (intmask & SDHCI_INT_DATA_END_BIT)
2465                 host->data->error = -EILSEQ;
2466         else if ((intmask & SDHCI_INT_DATA_CRC) &&
2467                 SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND))
2468                         != MMC_BUS_TEST_R)
2469                 host->data->error = -EILSEQ;
2470         else if (intmask & SDHCI_INT_ADMA_ERROR) {
2471                 pr_err("%s: ADMA error\n", mmc_hostname(host->mmc));
2472                 sdhci_adma_show_error(host);
2473                 host->data->error = -EIO;
2474                 if (host->ops->adma_workaround)
2475                         host->ops->adma_workaround(host, intmask);
2476         }
2477 
2478         if (host->data->error)
2479                 sdhci_finish_data(host);
2480         else {
2481                 if (intmask & (SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL))
2482                         sdhci_transfer_pio(host);
2483 
2484                 /*
2485                  * We currently don't do anything fancy with DMA
2486                  * boundaries, but as we can't disable the feature
2487                  * we need to at least restart the transfer.
2488                  *
2489                  * According to the spec sdhci_readl(host, SDHCI_DMA_ADDRESS)
2490                  * should return a valid address to continue from, but as
2491                  * some controllers are faulty, don't trust them.
2492                  */
2493                 if (intmask & SDHCI_INT_DMA_END) {
2494                         u32 dmastart, dmanow;
2495                         dmastart = sg_dma_address(host->data->sg);
2496                         dmanow = dmastart + host->data->bytes_xfered;
2497                         /*
2498                          * Force update to the next DMA block boundary.
2499                          */
2500                         dmanow = (dmanow &
2501                                 ~(SDHCI_DEFAULT_BOUNDARY_SIZE - 1)) +
2502                                 SDHCI_DEFAULT_BOUNDARY_SIZE;
2503                         host->data->bytes_xfered = dmanow - dmastart;
2504                         DBG("%s: DMA base 0x%08x, transferred 0x%06x bytes,"
2505                                 " next 0x%08x\n",
2506                                 mmc_hostname(host->mmc), dmastart,
2507                                 host->data->bytes_xfered, dmanow);
2508                         sdhci_writel(host, dmanow, SDHCI_DMA_ADDRESS);
2509                 }
2510 
2511                 if (intmask & SDHCI_INT_DATA_END) {
2512                         if (host->cmd) {
2513                                 /*
2514                                  * Data managed to finish before the
2515                                  * command completed. Make sure we do
2516                                  * things in the proper order.
2517                                  */
2518                                 host->data_early = 1;
2519                         } else {
2520                                 sdhci_finish_data(host);
2521                         }
2522                 }
2523         }
2524 }
2525 
2526 static irqreturn_t sdhci_irq(int irq, void *dev_id)
2527 {
2528         irqreturn_t result = IRQ_NONE;
2529         struct sdhci_host *host = dev_id;
2530         u32 intmask, mask, unexpected = 0;
2531         int max_loops = 16;
2532 
2533         spin_lock(&host->lock);
2534 
2535         if (host->runtime_suspended && !sdhci_sdio_irq_enabled(host)) {
2536                 spin_unlock(&host->lock);
2537                 return IRQ_NONE;
2538         }
2539 
2540         intmask = sdhci_readl(host, SDHCI_INT_STATUS);
2541         if (!intmask || intmask == 0xffffffff) {
2542                 result = IRQ_NONE;
2543                 goto out;
2544         }
2545 
2546         do {
2547                 /* Clear selected interrupts. */
2548                 mask = intmask & (SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK |
2549                                   SDHCI_INT_BUS_POWER);
2550                 sdhci_writel(host, mask, SDHCI_INT_STATUS);
2551 
2552                 DBG("*** %s got interrupt: 0x%08x\n",
2553                         mmc_hostname(host->mmc), intmask);
2554 
2555                 if (intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
2556                         u32 present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
2557                                       SDHCI_CARD_PRESENT;
2558 
2559                         /*
2560                          * There is a observation on i.mx esdhc.  INSERT
2561                          * bit will be immediately set again when it gets
2562                          * cleared, if a card is inserted.  We have to mask
2563                          * the irq to prevent interrupt storm which will
2564                          * freeze the system.  And the REMOVE gets the
2565                          * same situation.
2566                          *
2567                          * More testing are needed here to ensure it works
2568                          * for other platforms though.
2569                          */
2570                         host->ier &= ~(SDHCI_INT_CARD_INSERT |
2571                                        SDHCI_INT_CARD_REMOVE);
2572                         host->ier |= present ? SDHCI_INT_CARD_REMOVE :
2573                                                SDHCI_INT_CARD_INSERT;
2574                         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
2575                         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
2576 
2577                         sdhci_writel(host, intmask & (SDHCI_INT_CARD_INSERT |
2578                                      SDHCI_INT_CARD_REMOVE), SDHCI_INT_STATUS);
2579 
2580                         host->thread_isr |= intmask & (SDHCI_INT_CARD_INSERT |
2581                                                        SDHCI_INT_CARD_REMOVE);
2582                         result = IRQ_WAKE_THREAD;
2583                 }
2584 
2585                 if (intmask & SDHCI_INT_CMD_MASK)
2586                         sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK,
2587                                       &intmask);
2588 
2589                 if (intmask & SDHCI_INT_DATA_MASK)
2590                         sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK);
2591 
2592                 if (intmask & SDHCI_INT_BUS_POWER)
2593                         pr_err("%s: Card is consuming too much power!\n",
2594                                 mmc_hostname(host->mmc));
2595 
2596                 if (intmask & SDHCI_INT_CARD_INT) {
2597                         sdhci_enable_sdio_irq_nolock(host, false);
2598                         host->thread_isr |= SDHCI_INT_CARD_INT;
2599                         result = IRQ_WAKE_THREAD;
2600                 }
2601 
2602                 intmask &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE |
2603                              SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK |
2604                              SDHCI_INT_ERROR | SDHCI_INT_BUS_POWER |
2605                              SDHCI_INT_CARD_INT);
2606 
2607                 if (intmask) {
2608                         unexpected |= intmask;
2609                         sdhci_writel(host, intmask, SDHCI_INT_STATUS);
2610                 }
2611 
2612                 if (result == IRQ_NONE)
2613                         result = IRQ_HANDLED;
2614 
2615                 intmask = sdhci_readl(host, SDHCI_INT_STATUS);
2616         } while (intmask && --max_loops);
2617 out:
2618         spin_unlock(&host->lock);
2619 
2620         if (unexpected) {
2621                 pr_err("%s: Unexpected interrupt 0x%08x.\n",
2622                            mmc_hostname(host->mmc), unexpected);
2623                 sdhci_dumpregs(host);
2624         }
2625 
2626         return result;
2627 }
2628 
2629 static irqreturn_t sdhci_thread_irq(int irq, void *dev_id)
2630 {
2631         struct sdhci_host *host = dev_id;
2632         unsigned long flags;
2633         u32 isr;
2634 
2635         spin_lock_irqsave(&host->lock, flags);
2636         isr = host->thread_isr;
2637         host->thread_isr = 0;
2638         spin_unlock_irqrestore(&host->lock, flags);
2639 
2640         if (isr & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
2641                 sdhci_card_event(host->mmc);
2642                 mmc_detect_change(host->mmc, msecs_to_jiffies(200));
2643         }
2644 
2645         if (isr & SDHCI_INT_CARD_INT) {
2646                 sdio_run_irqs(host->mmc);
2647 
2648                 spin_lock_irqsave(&host->lock, flags);
2649                 if (host->flags & SDHCI_SDIO_IRQ_ENABLED)
2650                         sdhci_enable_sdio_irq_nolock(host, true);
2651                 spin_unlock_irqrestore(&host->lock, flags);
2652         }
2653 
2654         return isr ? IRQ_HANDLED : IRQ_NONE;
2655 }
2656 
2657 /*****************************************************************************\
2658  *                                                                           *
2659  * Suspend/resume                                                            *
2660  *                                                                           *
2661 \*****************************************************************************/
2662 
2663 #ifdef CONFIG_PM
2664 void sdhci_enable_irq_wakeups(struct sdhci_host *host)
2665 {
2666         u8 val;
2667         u8 mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE
2668                         | SDHCI_WAKE_ON_INT;
2669 
2670         val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
2671         val |= mask ;
2672         /* Avoid fake wake up */
2673         if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
2674                 val &= ~(SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE);
2675         sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
2676 }
2677 EXPORT_SYMBOL_GPL(sdhci_enable_irq_wakeups);
2678 
2679 static void sdhci_disable_irq_wakeups(struct sdhci_host *host)
2680 {
2681         u8 val;
2682         u8 mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE
2683                         | SDHCI_WAKE_ON_INT;
2684 
2685         val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
2686         val &= ~mask;
2687         sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
2688 }
2689 
2690 int sdhci_suspend_host(struct sdhci_host *host)
2691 {
2692         sdhci_disable_card_detection(host);
2693 
2694         mmc_retune_timer_stop(host->mmc);
2695         mmc_retune_needed(host->mmc);
2696 
2697         if (!device_may_wakeup(mmc_dev(host->mmc))) {
2698                 host->ier = 0;
2699                 sdhci_writel(host, 0, SDHCI_INT_ENABLE);
2700                 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
2701                 free_irq(host->irq, host);
2702         } else {
2703                 sdhci_enable_irq_wakeups(host);
2704                 enable_irq_wake(host->irq);
2705         }
2706         return 0;
2707 }
2708 
2709 EXPORT_SYMBOL_GPL(sdhci_suspend_host);
2710 
2711 int sdhci_resume_host(struct sdhci_host *host)
2712 {
2713         int ret = 0;
2714 
2715         if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
2716                 if (host->ops->enable_dma)
2717                         host->ops->enable_dma(host);
2718         }
2719 
2720         if ((host->mmc->pm_flags & MMC_PM_KEEP_POWER) &&
2721             (host->quirks2 & SDHCI_QUIRK2_HOST_OFF_CARD_ON)) {
2722                 /* Card keeps power but host controller does not */
2723                 sdhci_init(host, 0);
2724                 host->pwr = 0;
2725                 host->clock = 0;
2726                 sdhci_do_set_ios(host, &host->mmc->ios);
2727         } else {
2728                 sdhci_init(host, (host->mmc->pm_flags & MMC_PM_KEEP_POWER));
2729                 mmiowb();
2730         }
2731 
2732         if (!device_may_wakeup(mmc_dev(host->mmc))) {
2733                 ret = request_threaded_irq(host->irq, sdhci_irq,
2734                                            sdhci_thread_irq, IRQF_SHARED,
2735                                            mmc_hostname(host->mmc), host);
2736                 if (ret)
2737                         return ret;
2738         } else {
2739                 sdhci_disable_irq_wakeups(host);
2740                 disable_irq_wake(host->irq);
2741         }
2742 
2743         sdhci_enable_card_detection(host);
2744 
2745         return ret;
2746 }
2747 
2748 EXPORT_SYMBOL_GPL(sdhci_resume_host);
2749 
2750 static int sdhci_runtime_pm_get(struct sdhci_host *host)
2751 {
2752         return pm_runtime_get_sync(host->mmc->parent);
2753 }
2754 
2755 static int sdhci_runtime_pm_put(struct sdhci_host *host)
2756 {
2757         pm_runtime_mark_last_busy(host->mmc->parent);
2758         return pm_runtime_put_autosuspend(host->mmc->parent);
2759 }
2760 
2761 static void sdhci_runtime_pm_bus_on(struct sdhci_host *host)
2762 {
2763         if (host->runtime_suspended || host->bus_on)
2764                 return;
2765         host->bus_on = true;
2766         pm_runtime_get_noresume(host->mmc->parent);
2767 }
2768 
2769 static void sdhci_runtime_pm_bus_off(struct sdhci_host *host)
2770 {
2771         if (host->runtime_suspended || !host->bus_on)
2772                 return;
2773         host->bus_on = false;
2774         pm_runtime_put_noidle(host->mmc->parent);
2775 }
2776 
2777 int sdhci_runtime_suspend_host(struct sdhci_host *host)
2778 {
2779         unsigned long flags;
2780 
2781         mmc_retune_timer_stop(host->mmc);
2782         mmc_retune_needed(host->mmc);
2783 
2784         spin_lock_irqsave(&host->lock, flags);
2785         host->ier &= SDHCI_INT_CARD_INT;
2786         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
2787         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
2788         spin_unlock_irqrestore(&host->lock, flags);
2789 
2790         synchronize_hardirq(host->irq);
2791 
2792         spin_lock_irqsave(&host->lock, flags);
2793         host->runtime_suspended = true;
2794         spin_unlock_irqrestore(&host->lock, flags);
2795 
2796         return 0;
2797 }
2798 EXPORT_SYMBOL_GPL(sdhci_runtime_suspend_host);
2799 
2800 int sdhci_runtime_resume_host(struct sdhci_host *host)
2801 {
2802         unsigned long flags;
2803         int host_flags = host->flags;
2804 
2805         if (host_flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
2806                 if (host->ops->enable_dma)
2807                         host->ops->enable_dma(host);
2808         }
2809 
2810         sdhci_init(host, 0);
2811 
2812         /* Force clock and power re-program */
2813         host->pwr = 0;
2814         host->clock = 0;
2815         sdhci_do_start_signal_voltage_switch(host, &host->mmc->ios);
2816         sdhci_do_set_ios(host, &host->mmc->ios);
2817 
2818         if ((host_flags & SDHCI_PV_ENABLED) &&
2819                 !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN)) {
2820                 spin_lock_irqsave(&host->lock, flags);
2821                 sdhci_enable_preset_value(host, true);
2822                 spin_unlock_irqrestore(&host->lock, flags);
2823         }
2824 
2825         spin_lock_irqsave(&host->lock, flags);
2826 
2827         host->runtime_suspended = false;
2828 
2829         /* Enable SDIO IRQ */
2830         if (host->flags & SDHCI_SDIO_IRQ_ENABLED)
2831                 sdhci_enable_sdio_irq_nolock(host, true);
2832 
2833         /* Enable Card Detection */
2834         sdhci_enable_card_detection(host);
2835 
2836         spin_unlock_irqrestore(&host->lock, flags);
2837 
2838         return 0;
2839 }
2840 EXPORT_SYMBOL_GPL(sdhci_runtime_resume_host);
2841 
2842 #endif /* CONFIG_PM */
2843 
2844 /*****************************************************************************\
2845  *                                                                           *
2846  * Device allocation/registration                                            *
2847  *                                                                           *
2848 \*****************************************************************************/
2849 
2850 struct sdhci_host *sdhci_alloc_host(struct device *dev,
2851         size_t priv_size)
2852 {
2853         struct mmc_host *mmc;
2854         struct sdhci_host *host;
2855 
2856         WARN_ON(dev == NULL);
2857 
2858         mmc = mmc_alloc_host(sizeof(struct sdhci_host) + priv_size, dev);
2859         if (!mmc)
2860                 return ERR_PTR(-ENOMEM);
2861 
2862         host = mmc_priv(mmc);
2863         host->mmc = mmc;
2864 
2865         return host;
2866 }
2867 
2868 EXPORT_SYMBOL_GPL(sdhci_alloc_host);
2869 
2870 int sdhci_add_host(struct sdhci_host *host)
2871 {
2872         struct mmc_host *mmc;
2873         u32 caps[2] = {0, 0};
2874         u32 max_current_caps;
2875         unsigned int ocr_avail;
2876         unsigned int override_timeout_clk;
2877         u32 max_clk;
2878         int ret;
2879 
2880         WARN_ON(host == NULL);
2881         if (host == NULL)
2882                 return -EINVAL;
2883 
2884         mmc = host->mmc;
2885 
2886         if (debug_quirks)
2887                 host->quirks = debug_quirks;
2888         if (debug_quirks2)
2889                 host->quirks2 = debug_quirks2;
2890 
2891         override_timeout_clk = host->timeout_clk;
2892 
2893         sdhci_do_reset(host, SDHCI_RESET_ALL);
2894 
2895         host->version = sdhci_readw(host, SDHCI_HOST_VERSION);
2896         host->version = (host->version & SDHCI_SPEC_VER_MASK)
2897                                 >> SDHCI_SPEC_VER_SHIFT;
2898         if (host->version > SDHCI_SPEC_300) {
2899                 pr_err("%s: Unknown controller version (%d). "
2900                         "You may experience problems.\n", mmc_hostname(mmc),
2901                         host->version);
2902         }
2903 
2904         caps[0] = (host->quirks & SDHCI_QUIRK_MISSING_CAPS) ? host->caps :
2905                 sdhci_readl(host, SDHCI_CAPABILITIES);
2906 
2907         if (host->version >= SDHCI_SPEC_300)
2908                 caps[1] = (host->quirks & SDHCI_QUIRK_MISSING_CAPS) ?
2909                         host->caps1 :
2910                         sdhci_readl(host, SDHCI_CAPABILITIES_1);
2911 
2912         if (host->quirks & SDHCI_QUIRK_FORCE_DMA)
2913                 host->flags |= SDHCI_USE_SDMA;
2914         else if (!(caps[0] & SDHCI_CAN_DO_SDMA))
2915                 DBG("Controller doesn't have SDMA capability\n");
2916         else
2917                 host->flags |= SDHCI_USE_SDMA;
2918 
2919         if ((host->quirks & SDHCI_QUIRK_BROKEN_DMA) &&
2920                 (host->flags & SDHCI_USE_SDMA)) {
2921                 DBG("Disabling DMA as it is marked broken\n");
2922                 host->flags &= ~SDHCI_USE_SDMA;
2923         }
2924 
2925         if ((host->version >= SDHCI_SPEC_200) &&
2926                 (caps[0] & SDHCI_CAN_DO_ADMA2))
2927                 host->flags |= SDHCI_USE_ADMA;
2928 
2929         if ((host->quirks & SDHCI_QUIRK_BROKEN_ADMA) &&
2930                 (host->flags & SDHCI_USE_ADMA)) {
2931                 DBG("Disabling ADMA as it is marked broken\n");
2932                 host->flags &= ~SDHCI_USE_ADMA;
2933         }
2934 
2935         /*
2936          * It is assumed that a 64-bit capable device has set a 64-bit DMA mask
2937          * and *must* do 64-bit DMA.  A driver has the opportunity to change
2938          * that during the first call to ->enable_dma().  Similarly
2939          * SDHCI_QUIRK2_BROKEN_64_BIT_DMA must be left to the drivers to
2940          * implement.
2941          */
2942         if (sdhci_readl(host, SDHCI_CAPABILITIES) & SDHCI_CAN_64BIT)
2943                 host->flags |= SDHCI_USE_64_BIT_DMA;
2944 
2945         if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
2946                 if (host->ops->enable_dma) {
2947                         if (host->ops->enable_dma(host)) {
2948                                 pr_warn("%s: No suitable DMA available - falling back to PIO\n",
2949                                         mmc_hostname(mmc));
2950                                 host->flags &=
2951                                         ~(SDHCI_USE_SDMA | SDHCI_USE_ADMA);
2952                         }
2953                 }
2954         }
2955 
2956         /* SDMA does not support 64-bit DMA */
2957         if (host->flags & SDHCI_USE_64_BIT_DMA)
2958                 host->flags &= ~SDHCI_USE_SDMA;
2959 
2960         if (host->flags & SDHCI_USE_ADMA) {
2961                 /*
2962                  * The DMA descriptor table size is calculated as the maximum
2963                  * number of segments times 2, to allow for an alignment
2964                  * descriptor for each segment, plus 1 for a nop end descriptor,
2965                  * all multipled by the descriptor size.
2966                  */
2967                 if (host->flags & SDHCI_USE_64_BIT_DMA) {
2968                         host->adma_table_sz = (SDHCI_MAX_SEGS * 2 + 1) *
2969                                               SDHCI_ADMA2_64_DESC_SZ;
2970                         host->align_buffer_sz = SDHCI_MAX_SEGS *
2971                                                 SDHCI_ADMA2_64_ALIGN;
2972                         host->desc_sz = SDHCI_ADMA2_64_DESC_SZ;
2973                         host->align_sz = SDHCI_ADMA2_64_ALIGN;
2974                         host->align_mask = SDHCI_ADMA2_64_ALIGN - 1;
2975                 } else {
2976                         host->adma_table_sz = (SDHCI_MAX_SEGS * 2 + 1) *
2977                                               SDHCI_ADMA2_32_DESC_SZ;
2978                         host->align_buffer_sz = SDHCI_MAX_SEGS *
2979                                                 SDHCI_ADMA2_32_ALIGN;
2980                         host->desc_sz = SDHCI_ADMA2_32_DESC_SZ;
2981                         host->align_sz = SDHCI_ADMA2_32_ALIGN;
2982                         host->align_mask = SDHCI_ADMA2_32_ALIGN - 1;
2983                 }
2984                 host->adma_table = dma_alloc_coherent(mmc_dev(mmc),
2985                                                       host->adma_table_sz,
2986                                                       &host->adma_addr,
2987                                                       GFP_KERNEL);
2988                 host->align_buffer = kmalloc(host->align_buffer_sz, GFP_KERNEL);
2989                 if (!host->adma_table || !host->align_buffer) {
2990                         if (host->adma_table)
2991                                 dma_free_coherent(mmc_dev(mmc),
2992                                                   host->adma_table_sz,
2993                                                   host->adma_table,
2994                                                   host->adma_addr);
2995                         kfree(host->align_buffer);
2996                         pr_warn("%s: Unable to allocate ADMA buffers - falling back to standard DMA\n",
2997                                 mmc_hostname(mmc));
2998                         host->flags &= ~SDHCI_USE_ADMA;
2999                         host->adma_table = NULL;
3000                         host->align_buffer = NULL;
3001                 } else if (host->adma_addr & host->align_mask) {
3002                         pr_warn("%s: unable to allocate aligned ADMA descriptor\n",
3003                                 mmc_hostname(mmc));
3004                         host->flags &= ~SDHCI_USE_ADMA;
3005                         dma_free_coherent(mmc_dev(mmc), host->adma_table_sz,
3006                                           host->adma_table, host->adma_addr);
3007                         kfree(host->align_buffer);
3008                         host->adma_table = NULL;
3009                         host->align_buffer = NULL;
3010                 }
3011         }
3012 
3013         /*
3014          * If we use DMA, then it's up to the caller to set the DMA
3015          * mask, but PIO does not need the hw shim so we set a new
3016          * mask here in that case.
3017          */
3018         if (!(host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA))) {
3019                 host->dma_mask = DMA_BIT_MASK(64);
3020                 mmc_dev(mmc)->dma_mask = &host->dma_mask;
3021         }
3022 
3023         if (host->version >= SDHCI_SPEC_300)
3024                 host->max_clk = (caps[0] & SDHCI_CLOCK_V3_BASE_MASK)
3025                         >> SDHCI_CLOCK_BASE_SHIFT;
3026         else
3027                 host->max_clk = (caps[0] & SDHCI_CLOCK_BASE_MASK)
3028                         >> SDHCI_CLOCK_BASE_SHIFT;
3029 
3030         host->max_clk *= 1000000;
3031         if (host->max_clk == 0 || host->quirks &
3032                         SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN) {
3033                 if (!host->ops->get_max_clock) {
3034                         pr_err("%s: Hardware doesn't specify base clock "
3035                                "frequency.\n", mmc_hostname(mmc));
3036                         return -ENODEV;
3037                 }
3038                 host->max_clk = host->ops->get_max_clock(host);
3039         }
3040 
3041         /*
3042          * In case of Host Controller v3.00, find out whether clock
3043          * multiplier is supported.
3044          */
3045         host->clk_mul = (caps[1] & SDHCI_CLOCK_MUL_MASK) >>
3046                         SDHCI_CLOCK_MUL_SHIFT;
3047 
3048         /*
3049          * In case the value in Clock Multiplier is 0, then programmable
3050          * clock mode is not supported, otherwise the actual clock
3051          * multiplier is one more than the value of Clock Multiplier
3052          * in the Capabilities Register.
3053          */
3054         if (host->clk_mul)
3055                 host->clk_mul += 1;
3056 
3057         /*
3058          * Set host parameters.
3059          */
3060         mmc->ops = &sdhci_ops;
3061         max_clk = host->max_clk;
3062 
3063         if (host->ops->get_min_clock)
3064                 mmc->f_min = host->ops->get_min_clock(host);
3065         else if (host->version >= SDHCI_SPEC_300) {
3066                 if (host->clk_mul) {
3067                         mmc->f_min = (host->max_clk * host->clk_mul) / 1024;
3068                         max_clk = host->max_clk * host->clk_mul;
3069                 } else
3070                         mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_300;
3071         } else
3072                 mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_200;
3073 
3074         if (!mmc->f_max || (mmc->f_max && (mmc->f_max > max_clk)))
3075                 mmc->f_max = max_clk;
3076 
3077         if (!(host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK)) {
3078                 host->timeout_clk = (caps[0] & SDHCI_TIMEOUT_CLK_MASK) >>
3079                                         SDHCI_TIMEOUT_CLK_SHIFT;
3080                 if (host->timeout_clk == 0) {
3081                         if (host->ops->get_timeout_clock) {
3082                                 host->timeout_clk =
3083                                         host->ops->get_timeout_clock(host);
3084                         } else {
3085                                 pr_err("%s: Hardware doesn't specify timeout clock frequency.\n",
3086                                         mmc_hostname(mmc));
3087                                 return -ENODEV;
3088                         }
3089                 }
3090 
3091                 if (caps[0] & SDHCI_TIMEOUT_CLK_UNIT)
3092                         host->timeout_clk *= 1000;
3093 
3094                 mmc->max_busy_timeout = host->ops->get_max_timeout_count ?
3095                         host->ops->get_max_timeout_count(host) : 1 << 27;
3096                 mmc->max_busy_timeout /= host->timeout_clk;
3097         }
3098 
3099         if (override_timeout_clk)
3100                 host->timeout_clk = override_timeout_clk;
3101 
3102         mmc->caps |= MMC_CAP_SDIO_IRQ | MMC_CAP_ERASE | MMC_CAP_CMD23;
3103         mmc->caps2 |= MMC_CAP2_SDIO_IRQ_NOTHREAD;
3104 
3105         if (host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12)
3106                 host->flags |= SDHCI_AUTO_CMD12;
3107 
3108         /* Auto-CMD23 stuff only works in ADMA or PIO. */
3109         if ((host->version >= SDHCI_SPEC_300) &&
3110             ((host->flags & SDHCI_USE_ADMA) ||
3111              !(host->flags & SDHCI_USE_SDMA)) &&
3112              !(host->quirks2 & SDHCI_QUIRK2_ACMD23_BROKEN)) {
3113                 host->flags |= SDHCI_AUTO_CMD23;
3114                 DBG("%s: Auto-CMD23 available\n", mmc_hostname(mmc));
3115         } else {
3116                 DBG("%s: Auto-CMD23 unavailable\n", mmc_hostname(mmc));
3117         }
3118 
3119         /*
3120          * A controller may support 8-bit width, but the board itself
3121          * might not have the pins brought out.  Boards that support
3122          * 8-bit width must set "mmc->caps |= MMC_CAP_8_BIT_DATA;" in
3123          * their platform code before calling sdhci_add_host(), and we
3124          * won't assume 8-bit width for hosts without that CAP.
3125          */
3126         if (!(host->quirks & SDHCI_QUIRK_FORCE_1_BIT_DATA))
3127                 mmc->caps |= MMC_CAP_4_BIT_DATA;
3128 
3129         if (host->quirks2 & SDHCI_QUIRK2_HOST_NO_CMD23)
3130                 mmc->caps &= ~MMC_CAP_CMD23;
3131 
3132         if (caps[0] & SDHCI_CAN_DO_HISPD)
3133                 mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
3134 
3135         if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) &&
3136             !(mmc->caps & MMC_CAP_NONREMOVABLE) &&
3137             IS_ERR_VALUE(mmc_gpio_get_cd(host->mmc)))
3138                 mmc->caps |= MMC_CAP_NEEDS_POLL;
3139 
3140         /* If there are external regulators, get them */
3141         if (mmc_regulator_get_supply(mmc) == -EPROBE_DEFER)
3142                 return -EPROBE_DEFER;
3143 
3144         /* If vqmmc regulator and no 1.8V signalling, then there's no UHS */
3145         if (!IS_ERR(mmc->supply.vqmmc)) {
3146                 ret = regulator_enable(mmc->supply.vqmmc);
3147                 if (!regulator_is_supported_voltage(mmc->supply.vqmmc, 1700000,
3148                                                     1950000))
3149                         caps[1] &= ~(SDHCI_SUPPORT_SDR104 |
3150                                         SDHCI_SUPPORT_SDR50 |
3151                                         SDHCI_SUPPORT_DDR50);
3152                 if (ret) {
3153                         pr_warn("%s: Failed to enable vqmmc regulator: %d\n",
3154                                 mmc_hostname(mmc), ret);
3155                         mmc->supply.vqmmc = ERR_PTR(-EINVAL);
3156                 }
3157         }
3158 
3159         if (host->quirks2 & SDHCI_QUIRK2_NO_1_8_V)
3160                 caps[1] &= ~(SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 |
3161                        SDHCI_SUPPORT_DDR50);
3162 
3163         /* Any UHS-I mode in caps implies SDR12 and SDR25 support. */
3164         if (caps[1] & (SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 |
3165                        SDHCI_SUPPORT_DDR50))
3166                 mmc->caps |= MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25;
3167 
3168         /* SDR104 supports also implies SDR50 support */
3169         if (caps[1] & SDHCI_SUPPORT_SDR104) {
3170                 mmc->caps |= MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_SDR50;
3171                 /* SD3.0: SDR104 is supported so (for eMMC) the caps2
3172                  * field can be promoted to support HS200.
3173                  */
3174                 if (!(host->quirks2 & SDHCI_QUIRK2_BROKEN_HS200))
3175                         mmc->caps2 |= MMC_CAP2_HS200;
3176         } else if (caps[1] & SDHCI_SUPPORT_SDR50)
3177                 mmc->caps |= MMC_CAP_UHS_SDR50;
3178 
3179         if (host->quirks2 & SDHCI_QUIRK2_CAPS_BIT63_FOR_HS400 &&
3180             (caps[1] & SDHCI_SUPPORT_HS400))
3181                 mmc->caps2 |= MMC_CAP2_HS400;
3182 
3183         if ((mmc->caps2 & MMC_CAP2_HSX00_1_2V) &&
3184             (IS_ERR(mmc->supply.vqmmc) ||
3185              !regulator_is_supported_voltage(mmc->supply.vqmmc, 1100000,
3186                                              1300000)))
3187                 mmc->caps2 &= ~MMC_CAP2_HSX00_1_2V;
3188 
3189         if ((caps[1] & SDHCI_SUPPORT_DDR50) &&
3190                 !(host->quirks2 & SDHCI_QUIRK2_BROKEN_DDR50))
3191                 mmc->caps |= MMC_CAP_UHS_DDR50;
3192 
3193         /* Does the host need tuning for SDR50? */
3194         if (caps[1] & SDHCI_USE_SDR50_TUNING)
3195                 host->flags |= SDHCI_SDR50_NEEDS_TUNING;
3196 
3197         /* Does the host need tuning for SDR104 / HS200? */
3198         if (mmc->caps2 & MMC_CAP2_HS200)
3199                 host->flags |= SDHCI_SDR104_NEEDS_TUNING;
3200 
3201         /* Driver Type(s) (A, C, D) supported by the host */
3202         if (caps[1] & SDHCI_DRIVER_TYPE_A)
3203                 mmc->caps |= MMC_CAP_DRIVER_TYPE_A;
3204         if (caps[1] & SDHCI_DRIVER_TYPE_C)
3205                 mmc->caps |= MMC_CAP_DRIVER_TYPE_C;
3206         if (caps[1] & SDHCI_DRIVER_TYPE_D)
3207                 mmc->caps |= MMC_CAP_DRIVER_TYPE_D;
3208 
3209         /* Initial value for re-tuning timer count */
3210         host->tuning_count = (caps[1] & SDHCI_RETUNING_TIMER_COUNT_MASK) >>
3211                               SDHCI_RETUNING_TIMER_COUNT_SHIFT;
3212 
3213         /*
3214          * In case Re-tuning Timer is not disabled, the actual value of
3215          * re-tuning timer will be 2 ^ (n - 1).
3216          */
3217         if (host->tuning_count)
3218                 host->tuning_count = 1 << (host->tuning_count - 1);
3219 
3220         /* Re-tuning mode supported by the Host Controller */
3221         host->tuning_mode = (caps[1] & SDHCI_RETUNING_MODE_MASK) >>
3222                              SDHCI_RETUNING_MODE_SHIFT;
3223 
3224         ocr_avail = 0;
3225 
3226         /*
3227          * According to SD Host Controller spec v3.00, if the Host System
3228          * can afford more than 150mA, Host Driver should set XPC to 1. Also
3229          * the value is meaningful only if Voltage Support in the Capabilities
3230          * register is set. The actual current value is 4 times the register
3231          * value.
3232          */
3233         max_current_caps = sdhci_readl(host, SDHCI_MAX_CURRENT);
3234         if (!max_current_caps && !IS_ERR(mmc->supply.vmmc)) {
3235                 int curr = regulator_get_current_limit(mmc->supply.vmmc);
3236                 if (curr > 0) {
3237 
3238                         /* convert to SDHCI_MAX_CURRENT format */
3239                         curr = curr/1000;  /* convert to mA */
3240                         curr = curr/SDHCI_MAX_CURRENT_MULTIPLIER;
3241 
3242                         curr = min_t(u32, curr, SDHCI_MAX_CURRENT_LIMIT);
3243                         max_current_caps =
3244                                 (curr << SDHCI_MAX_CURRENT_330_SHIFT) |
3245                                 (curr << SDHCI_MAX_CURRENT_300_SHIFT) |
3246                                 (curr << SDHCI_MAX_CURRENT_180_SHIFT);
3247                 }
3248         }
3249 
3250         if (caps[0] & SDHCI_CAN_VDD_330) {
3251                 ocr_avail |= MMC_VDD_32_33 | MMC_VDD_33_34;
3252 
3253                 mmc->max_current_330 = ((max_current_caps &
3254                                    SDHCI_MAX_CURRENT_330_MASK) >>
3255                                    SDHCI_MAX_CURRENT_330_SHIFT) *
3256                                    SDHCI_MAX_CURRENT_MULTIPLIER;
3257         }
3258         if (caps[0] & SDHCI_CAN_VDD_300) {
3259                 ocr_avail |= MMC_VDD_29_30 | MMC_VDD_30_31;
3260 
3261                 mmc->max_current_300 = ((max_current_caps &
3262                                    SDHCI_MAX_CURRENT_300_MASK) >>
3263                                    SDHCI_MAX_CURRENT_300_SHIFT) *
3264                                    SDHCI_MAX_CURRENT_MULTIPLIER;
3265         }
3266         if (caps[0] & SDHCI_CAN_VDD_180) {
3267                 ocr_avail |= MMC_VDD_165_195;
3268 
3269                 mmc->max_current_180 = ((max_current_caps &
3270                                    SDHCI_MAX_CURRENT_180_MASK) >>
3271                                    SDHCI_MAX_CURRENT_180_SHIFT) *
3272                                    SDHCI_MAX_CURRENT_MULTIPLIER;
3273         }
3274 
3275         /* If OCR set by host, use it instead. */
3276         if (host->ocr_mask)
3277                 ocr_avail = host->ocr_mask;
3278 
3279         /* If OCR set by external regulators, give it highest prio. */
3280         if (mmc->ocr_avail)
3281                 ocr_avail = mmc->ocr_avail;
3282 
3283         mmc->ocr_avail = ocr_avail;
3284         mmc->ocr_avail_sdio = ocr_avail;
3285         if (host->ocr_avail_sdio)
3286                 mmc->ocr_avail_sdio &= host->ocr_avail_sdio;
3287         mmc->ocr_avail_sd = ocr_avail;
3288         if (host->ocr_avail_sd)
3289                 mmc->ocr_avail_sd &= host->ocr_avail_sd;
3290         else /* normal SD controllers don't support 1.8V */
3291                 mmc->ocr_avail_sd &= ~MMC_VDD_165_195;
3292         mmc->ocr_avail_mmc = ocr_avail;
3293         if (host->ocr_avail_mmc)
3294                 mmc->ocr_avail_mmc &= host->ocr_avail_mmc;
3295 
3296         if (mmc->ocr_avail == 0) {
3297                 pr_err("%s: Hardware doesn't report any "
3298                         "support voltages.\n", mmc_hostname(mmc));
3299                 return -ENODEV;
3300         }
3301 
3302         spin_lock_init(&host->lock);
3303 
3304         /*
3305          * Maximum number of segments. Depends on if the hardware
3306          * can do scatter/gather or not.
3307          */
3308         if (host->flags & SDHCI_USE_ADMA)
3309                 mmc->max_segs = SDHCI_MAX_SEGS;
3310         else if (host->flags & SDHCI_USE_SDMA)
3311                 mmc->max_segs = 1;
3312         else /* PIO */
3313                 mmc->max_segs = SDHCI_MAX_SEGS;
3314 
3315         /*
3316          * Maximum number of sectors in one transfer. Limited by SDMA boundary
3317          * size (512KiB). Note some tuning modes impose a 4MiB limit, but this
3318          * is less anyway.
3319          */
3320         mmc->max_req_size = 524288;
3321 
3322         /*
3323          * Maximum segment size. Could be one segment with the maximum number
3324          * of bytes. When doing hardware scatter/gather, each entry cannot
3325          * be larger than 64 KiB though.
3326          */
3327         if (host->flags & SDHCI_USE_ADMA) {
3328                 if (host->quirks & SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC)
3329                         mmc->max_seg_size = 65535;
3330                 else
3331                         mmc->max_seg_size = 65536;
3332         } else {
3333                 mmc->max_seg_size = mmc->max_req_size;
3334         }
3335 
3336         /*
3337          * Maximum block size. This varies from controller to controller and
3338          * is specified in the capabilities register.
3339          */
3340         if (host->quirks & SDHCI_QUIRK_FORCE_BLK_SZ_2048) {
3341                 mmc->max_blk_size = 2;
3342         } else {
3343                 mmc->max_blk_size = (caps[0] & SDHCI_MAX_BLOCK_MASK) >>
3344                                 SDHCI_MAX_BLOCK_SHIFT;
3345                 if (mmc->max_blk_size >= 3) {
3346                         pr_warn("%s: Invalid maximum block size, assuming 512 bytes\n",
3347                                 mmc_hostname(mmc));
3348                         mmc->max_blk_size = 0;
3349                 }
3350         }
3351 
3352         mmc->max_blk_size = 512 << mmc->max_blk_size;
3353 
3354         /*
3355          * Maximum block count.
3356          */
3357         mmc->max_blk_count = (host->quirks & SDHCI_QUIRK_NO_MULTIBLOCK) ? 1 : 65535;
3358 
3359         /*
3360          * Init tasklets.
3361          */
3362         tasklet_init(&host->finish_tasklet,
3363                 sdhci_tasklet_finish, (unsigned long)host);
3364 
3365         setup_timer(&host->timer, sdhci_timeout_timer, (unsigned long)host);
3366 
3367         init_waitqueue_head(&host->buf_ready_int);
3368 
3369         sdhci_init(host, 0);
3370 
3371         ret = request_threaded_irq(host->irq, sdhci_irq, sdhci_thread_irq,
3372                                    IRQF_SHARED, mmc_hostname(mmc), host);
3373         if (ret) {
3374                 pr_err("%s: Failed to request IRQ %d: %d\n",
3375                        mmc_hostname(mmc), host->irq, ret);
3376                 goto untasklet;
3377         }
3378 
3379 #ifdef CONFIG_MMC_DEBUG
3380         sdhci_dumpregs(host);
3381 #endif
3382 
3383 #ifdef SDHCI_USE_LEDS_CLASS
3384         snprintf(host->led_name, sizeof(host->led_name),
3385                 "%s::", mmc_hostname(mmc));
3386         host->led.name = host->led_name;
3387         host->led.brightness = LED_OFF;
3388         host->led.default_trigger = mmc_hostname(mmc);
3389         host->led.brightness_set = sdhci_led_control;
3390 
3391         ret = led_classdev_register(mmc_dev(mmc), &host->led);
3392         if (ret) {
3393                 pr_err("%s: Failed to register LED device: %d\n",
3394                        mmc_hostname(mmc), ret);
3395                 goto reset;
3396         }
3397 #endif
3398 
3399         mmiowb();
3400 
3401         mmc_add_host(mmc);
3402 
3403         pr_info("%s: SDHCI controller on %s [%s] using %s\n",
3404                 mmc_hostname(mmc), host->hw_name, dev_name(mmc_dev(mmc)),
3405                 (host->flags & SDHCI_USE_ADMA) ?
3406                 (host->flags & SDHCI_USE_64_BIT_DMA) ? "ADMA 64-bit" : "ADMA" :
3407                 (host->flags & SDHCI_USE_SDMA) ? "DMA" : "PIO");
3408 
3409         sdhci_enable_card_detection(host);
3410 
3411         return 0;
3412 
3413 #ifdef SDHCI_USE_LEDS_CLASS
3414 reset:
3415         sdhci_do_reset(host, SDHCI_RESET_ALL);
3416         sdhci_writel(host, 0, SDHCI_INT_ENABLE);
3417         sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
3418         free_irq(host->irq, host);
3419 #endif
3420 untasklet:
3421         tasklet_kill(&host->finish_tasklet);
3422 
3423         return ret;
3424 }
3425 
3426 EXPORT_SYMBOL_GPL(sdhci_add_host);
3427 
3428 void sdhci_remove_host(struct sdhci_host *host, int dead)
3429 {
3430         struct mmc_host *mmc = host->mmc;
3431         unsigned long flags;
3432 
3433         if (dead) {
3434                 spin_lock_irqsave(&host->lock, flags);
3435 
3436                 host->flags |= SDHCI_DEVICE_DEAD;
3437 
3438                 if (host->mrq) {
3439                         pr_err("%s: Controller removed during "
3440                                 " transfer!\n", mmc_hostname(mmc));
3441 
3442                         host->mrq->cmd->error = -ENOMEDIUM;
3443                         tasklet_schedule(&host->finish_tasklet);
3444                 }
3445 
3446                 spin_unlock_irqrestore(&host->lock, flags);
3447         }
3448 
3449         sdhci_disable_card_detection(host);
3450 
3451         mmc_remove_host(mmc);
3452 
3453 #ifdef SDHCI_USE_LEDS_CLASS
3454         led_classdev_unregister(&host->led);
3455 #endif
3456 
3457         if (!dead)
3458                 sdhci_do_reset(host, SDHCI_RESET_ALL);
3459 
3460         sdhci_writel(host, 0, SDHCI_INT_ENABLE);
3461         sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
3462         free_irq(host->irq, host);
3463 
3464         del_timer_sync(&host->timer);
3465 
3466         tasklet_kill(&host->finish_tasklet);
3467 
3468         if (!IS_ERR(mmc->supply.vqmmc))
3469                 regulator_disable(mmc->supply.vqmmc);
3470 
3471         if (host->adma_table)
3472                 dma_free_coherent(mmc_dev(mmc), host->adma_table_sz,
3473                                   host->adma_table, host->adma_addr);
3474         kfree(host->align_buffer);
3475 
3476         host->adma_table = NULL;
3477         host->align_buffer = NULL;
3478 }
3479 
3480 EXPORT_SYMBOL_GPL(sdhci_remove_host);
3481 
3482 void sdhci_free_host(struct sdhci_host *host)
3483 {
3484         mmc_free_host(host->mmc);
3485 }
3486 
3487 EXPORT_SYMBOL_GPL(sdhci_free_host);
3488 
3489 /*****************************************************************************\
3490  *                                                                           *
3491  * Driver init/exit                                                          *
3492  *                                                                           *
3493 \*****************************************************************************/
3494 
3495 static int __init sdhci_drv_init(void)
3496 {
3497         pr_info(DRIVER_NAME
3498                 ": Secure Digital Host Controller Interface driver\n");
3499         pr_info(DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
3500 
3501         return 0;
3502 }
3503 
3504 static void __exit sdhci_drv_exit(void)
3505 {
3506 }
3507 
3508 module_init(sdhci_drv_init);
3509 module_exit(sdhci_drv_exit);
3510 
3511 module_param(debug_quirks, uint, 0444);
3512 module_param(debug_quirks2, uint, 0444);
3513 
3514 MODULE_AUTHOR("Pierre Ossman <pierre@ossman.eu>");
3515 MODULE_DESCRIPTION("Secure Digital Host Controller Interface core driver");
3516 MODULE_LICENSE("GPL");
3517 
3518 MODULE_PARM_DESC(debug_quirks, "Force certain quirks.");
3519 MODULE_PARM_DESC(debug_quirks2, "Force certain other quirks.");
3520 

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