Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18

Linux/drivers/mmc/host/sdhci.c

  1 /*
  2  *  linux/drivers/mmc/host/sdhci.c - Secure Digital Host Controller Interface driver
  3  *
  4  *  Copyright (C) 2005-2008 Pierre Ossman, All Rights Reserved.
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License as published by
  8  * the Free Software Foundation; either version 2 of the License, or (at
  9  * your option) any later version.
 10  *
 11  * Thanks to the following companies for their support:
 12  *
 13  *     - JMicron (hardware and technical support)
 14  */
 15 
 16 #include <linux/delay.h>
 17 #include <linux/highmem.h>
 18 #include <linux/io.h>
 19 #include <linux/module.h>
 20 #include <linux/dma-mapping.h>
 21 #include <linux/slab.h>
 22 #include <linux/scatterlist.h>
 23 #include <linux/regulator/consumer.h>
 24 #include <linux/pm_runtime.h>
 25 
 26 #include <linux/leds.h>
 27 
 28 #include <linux/mmc/mmc.h>
 29 #include <linux/mmc/host.h>
 30 #include <linux/mmc/card.h>
 31 #include <linux/mmc/slot-gpio.h>
 32 
 33 #include "sdhci.h"
 34 
 35 #define DRIVER_NAME "sdhci"
 36 
 37 #define DBG(f, x...) \
 38         pr_debug(DRIVER_NAME " [%s()]: " f, __func__,## x)
 39 
 40 #if defined(CONFIG_LEDS_CLASS) || (defined(CONFIG_LEDS_CLASS_MODULE) && \
 41         defined(CONFIG_MMC_SDHCI_MODULE))
 42 #define SDHCI_USE_LEDS_CLASS
 43 #endif
 44 
 45 #define MAX_TUNING_LOOP 40
 46 
 47 #define ADMA_SIZE       ((128 * 2 + 1) * 4)
 48 
 49 static unsigned int debug_quirks = 0;
 50 static unsigned int debug_quirks2;
 51 
 52 static void sdhci_finish_data(struct sdhci_host *);
 53 
 54 static void sdhci_finish_command(struct sdhci_host *);
 55 static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode);
 56 static void sdhci_tuning_timer(unsigned long data);
 57 static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable);
 58 
 59 #ifdef CONFIG_PM_RUNTIME
 60 static int sdhci_runtime_pm_get(struct sdhci_host *host);
 61 static int sdhci_runtime_pm_put(struct sdhci_host *host);
 62 static void sdhci_runtime_pm_bus_on(struct sdhci_host *host);
 63 static void sdhci_runtime_pm_bus_off(struct sdhci_host *host);
 64 #else
 65 static inline int sdhci_runtime_pm_get(struct sdhci_host *host)
 66 {
 67         return 0;
 68 }
 69 static inline int sdhci_runtime_pm_put(struct sdhci_host *host)
 70 {
 71         return 0;
 72 }
 73 static void sdhci_runtime_pm_bus_on(struct sdhci_host *host)
 74 {
 75 }
 76 static void sdhci_runtime_pm_bus_off(struct sdhci_host *host)
 77 {
 78 }
 79 #endif
 80 
 81 static void sdhci_dumpregs(struct sdhci_host *host)
 82 {
 83         pr_debug(DRIVER_NAME ": =========== REGISTER DUMP (%s)===========\n",
 84                 mmc_hostname(host->mmc));
 85 
 86         pr_debug(DRIVER_NAME ": Sys addr: 0x%08x | Version:  0x%08x\n",
 87                 sdhci_readl(host, SDHCI_DMA_ADDRESS),
 88                 sdhci_readw(host, SDHCI_HOST_VERSION));
 89         pr_debug(DRIVER_NAME ": Blk size: 0x%08x | Blk cnt:  0x%08x\n",
 90                 sdhci_readw(host, SDHCI_BLOCK_SIZE),
 91                 sdhci_readw(host, SDHCI_BLOCK_COUNT));
 92         pr_debug(DRIVER_NAME ": Argument: 0x%08x | Trn mode: 0x%08x\n",
 93                 sdhci_readl(host, SDHCI_ARGUMENT),
 94                 sdhci_readw(host, SDHCI_TRANSFER_MODE));
 95         pr_debug(DRIVER_NAME ": Present:  0x%08x | Host ctl: 0x%08x\n",
 96                 sdhci_readl(host, SDHCI_PRESENT_STATE),
 97                 sdhci_readb(host, SDHCI_HOST_CONTROL));
 98         pr_debug(DRIVER_NAME ": Power:    0x%08x | Blk gap:  0x%08x\n",
 99                 sdhci_readb(host, SDHCI_POWER_CONTROL),
100                 sdhci_readb(host, SDHCI_BLOCK_GAP_CONTROL));
101         pr_debug(DRIVER_NAME ": Wake-up:  0x%08x | Clock:    0x%08x\n",
102                 sdhci_readb(host, SDHCI_WAKE_UP_CONTROL),
103                 sdhci_readw(host, SDHCI_CLOCK_CONTROL));
104         pr_debug(DRIVER_NAME ": Timeout:  0x%08x | Int stat: 0x%08x\n",
105                 sdhci_readb(host, SDHCI_TIMEOUT_CONTROL),
106                 sdhci_readl(host, SDHCI_INT_STATUS));
107         pr_debug(DRIVER_NAME ": Int enab: 0x%08x | Sig enab: 0x%08x\n",
108                 sdhci_readl(host, SDHCI_INT_ENABLE),
109                 sdhci_readl(host, SDHCI_SIGNAL_ENABLE));
110         pr_debug(DRIVER_NAME ": AC12 err: 0x%08x | Slot int: 0x%08x\n",
111                 sdhci_readw(host, SDHCI_ACMD12_ERR),
112                 sdhci_readw(host, SDHCI_SLOT_INT_STATUS));
113         pr_debug(DRIVER_NAME ": Caps:     0x%08x | Caps_1:   0x%08x\n",
114                 sdhci_readl(host, SDHCI_CAPABILITIES),
115                 sdhci_readl(host, SDHCI_CAPABILITIES_1));
116         pr_debug(DRIVER_NAME ": Cmd:      0x%08x | Max curr: 0x%08x\n",
117                 sdhci_readw(host, SDHCI_COMMAND),
118                 sdhci_readl(host, SDHCI_MAX_CURRENT));
119         pr_debug(DRIVER_NAME ": Host ctl2: 0x%08x\n",
120                 sdhci_readw(host, SDHCI_HOST_CONTROL2));
121 
122         if (host->flags & SDHCI_USE_ADMA)
123                 pr_debug(DRIVER_NAME ": ADMA Err: 0x%08x | ADMA Ptr: 0x%08x\n",
124                        readl(host->ioaddr + SDHCI_ADMA_ERROR),
125                        readl(host->ioaddr + SDHCI_ADMA_ADDRESS));
126 
127         pr_debug(DRIVER_NAME ": ===========================================\n");
128 }
129 
130 /*****************************************************************************\
131  *                                                                           *
132  * Low level functions                                                       *
133  *                                                                           *
134 \*****************************************************************************/
135 
136 static void sdhci_set_card_detection(struct sdhci_host *host, bool enable)
137 {
138         u32 present;
139 
140         if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) ||
141             (host->mmc->caps & MMC_CAP_NONREMOVABLE))
142                 return;
143 
144         if (enable) {
145                 present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
146                                       SDHCI_CARD_PRESENT;
147 
148                 host->ier |= present ? SDHCI_INT_CARD_REMOVE :
149                                        SDHCI_INT_CARD_INSERT;
150         } else {
151                 host->ier &= ~(SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT);
152         }
153 
154         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
155         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
156 }
157 
158 static void sdhci_enable_card_detection(struct sdhci_host *host)
159 {
160         sdhci_set_card_detection(host, true);
161 }
162 
163 static void sdhci_disable_card_detection(struct sdhci_host *host)
164 {
165         sdhci_set_card_detection(host, false);
166 }
167 
168 void sdhci_reset(struct sdhci_host *host, u8 mask)
169 {
170         unsigned long timeout;
171 
172         sdhci_writeb(host, mask, SDHCI_SOFTWARE_RESET);
173 
174         if (mask & SDHCI_RESET_ALL) {
175                 host->clock = 0;
176                 /* Reset-all turns off SD Bus Power */
177                 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
178                         sdhci_runtime_pm_bus_off(host);
179         }
180 
181         /* Wait max 100 ms */
182         timeout = 100;
183 
184         /* hw clears the bit when it's done */
185         while (sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask) {
186                 if (timeout == 0) {
187                         pr_err("%s: Reset 0x%x never completed.\n",
188                                 mmc_hostname(host->mmc), (int)mask);
189                         sdhci_dumpregs(host);
190                         return;
191                 }
192                 timeout--;
193                 mdelay(1);
194         }
195 }
196 EXPORT_SYMBOL_GPL(sdhci_reset);
197 
198 static void sdhci_do_reset(struct sdhci_host *host, u8 mask)
199 {
200         if (host->quirks & SDHCI_QUIRK_NO_CARD_NO_RESET) {
201                 if (!(sdhci_readl(host, SDHCI_PRESENT_STATE) &
202                         SDHCI_CARD_PRESENT))
203                         return;
204         }
205 
206         host->ops->reset(host, mask);
207 
208         if (mask & SDHCI_RESET_ALL) {
209                 if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
210                         if (host->ops->enable_dma)
211                                 host->ops->enable_dma(host);
212                 }
213 
214                 /* Resetting the controller clears many */
215                 host->preset_enabled = false;
216         }
217 }
218 
219 static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios);
220 
221 static void sdhci_init(struct sdhci_host *host, int soft)
222 {
223         if (soft)
224                 sdhci_do_reset(host, SDHCI_RESET_CMD|SDHCI_RESET_DATA);
225         else
226                 sdhci_do_reset(host, SDHCI_RESET_ALL);
227 
228         host->ier = SDHCI_INT_BUS_POWER | SDHCI_INT_DATA_END_BIT |
229                     SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_TIMEOUT |
230                     SDHCI_INT_INDEX | SDHCI_INT_END_BIT | SDHCI_INT_CRC |
231                     SDHCI_INT_TIMEOUT | SDHCI_INT_DATA_END |
232                     SDHCI_INT_RESPONSE;
233 
234         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
235         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
236 
237         if (soft) {
238                 /* force clock reconfiguration */
239                 host->clock = 0;
240                 sdhci_set_ios(host->mmc, &host->mmc->ios);
241         }
242 }
243 
244 static void sdhci_reinit(struct sdhci_host *host)
245 {
246         sdhci_init(host, 0);
247         /*
248          * Retuning stuffs are affected by different cards inserted and only
249          * applicable to UHS-I cards. So reset these fields to their initial
250          * value when card is removed.
251          */
252         if (host->flags & SDHCI_USING_RETUNING_TIMER) {
253                 host->flags &= ~SDHCI_USING_RETUNING_TIMER;
254 
255                 del_timer_sync(&host->tuning_timer);
256                 host->flags &= ~SDHCI_NEEDS_RETUNING;
257                 host->mmc->max_blk_count =
258                         (host->quirks & SDHCI_QUIRK_NO_MULTIBLOCK) ? 1 : 65535;
259         }
260         sdhci_enable_card_detection(host);
261 }
262 
263 static void sdhci_activate_led(struct sdhci_host *host)
264 {
265         u8 ctrl;
266 
267         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
268         ctrl |= SDHCI_CTRL_LED;
269         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
270 }
271 
272 static void sdhci_deactivate_led(struct sdhci_host *host)
273 {
274         u8 ctrl;
275 
276         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
277         ctrl &= ~SDHCI_CTRL_LED;
278         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
279 }
280 
281 #ifdef SDHCI_USE_LEDS_CLASS
282 static void sdhci_led_control(struct led_classdev *led,
283         enum led_brightness brightness)
284 {
285         struct sdhci_host *host = container_of(led, struct sdhci_host, led);
286         unsigned long flags;
287 
288         spin_lock_irqsave(&host->lock, flags);
289 
290         if (host->runtime_suspended)
291                 goto out;
292 
293         if (brightness == LED_OFF)
294                 sdhci_deactivate_led(host);
295         else
296                 sdhci_activate_led(host);
297 out:
298         spin_unlock_irqrestore(&host->lock, flags);
299 }
300 #endif
301 
302 /*****************************************************************************\
303  *                                                                           *
304  * Core functions                                                            *
305  *                                                                           *
306 \*****************************************************************************/
307 
308 static void sdhci_read_block_pio(struct sdhci_host *host)
309 {
310         unsigned long flags;
311         size_t blksize, len, chunk;
312         u32 uninitialized_var(scratch);
313         u8 *buf;
314 
315         DBG("PIO reading\n");
316 
317         blksize = host->data->blksz;
318         chunk = 0;
319 
320         local_irq_save(flags);
321 
322         while (blksize) {
323                 if (!sg_miter_next(&host->sg_miter))
324                         BUG();
325 
326                 len = min(host->sg_miter.length, blksize);
327 
328                 blksize -= len;
329                 host->sg_miter.consumed = len;
330 
331                 buf = host->sg_miter.addr;
332 
333                 while (len) {
334                         if (chunk == 0) {
335                                 scratch = sdhci_readl(host, SDHCI_BUFFER);
336                                 chunk = 4;
337                         }
338 
339                         *buf = scratch & 0xFF;
340 
341                         buf++;
342                         scratch >>= 8;
343                         chunk--;
344                         len--;
345                 }
346         }
347 
348         sg_miter_stop(&host->sg_miter);
349 
350         local_irq_restore(flags);
351 }
352 
353 static void sdhci_write_block_pio(struct sdhci_host *host)
354 {
355         unsigned long flags;
356         size_t blksize, len, chunk;
357         u32 scratch;
358         u8 *buf;
359 
360         DBG("PIO writing\n");
361 
362         blksize = host->data->blksz;
363         chunk = 0;
364         scratch = 0;
365 
366         local_irq_save(flags);
367 
368         while (blksize) {
369                 if (!sg_miter_next(&host->sg_miter))
370                         BUG();
371 
372                 len = min(host->sg_miter.length, blksize);
373 
374                 blksize -= len;
375                 host->sg_miter.consumed = len;
376 
377                 buf = host->sg_miter.addr;
378 
379                 while (len) {
380                         scratch |= (u32)*buf << (chunk * 8);
381 
382                         buf++;
383                         chunk++;
384                         len--;
385 
386                         if ((chunk == 4) || ((len == 0) && (blksize == 0))) {
387                                 sdhci_writel(host, scratch, SDHCI_BUFFER);
388                                 chunk = 0;
389                                 scratch = 0;
390                         }
391                 }
392         }
393 
394         sg_miter_stop(&host->sg_miter);
395 
396         local_irq_restore(flags);
397 }
398 
399 static void sdhci_transfer_pio(struct sdhci_host *host)
400 {
401         u32 mask;
402 
403         BUG_ON(!host->data);
404 
405         if (host->blocks == 0)
406                 return;
407 
408         if (host->data->flags & MMC_DATA_READ)
409                 mask = SDHCI_DATA_AVAILABLE;
410         else
411                 mask = SDHCI_SPACE_AVAILABLE;
412 
413         /*
414          * Some controllers (JMicron JMB38x) mess up the buffer bits
415          * for transfers < 4 bytes. As long as it is just one block,
416          * we can ignore the bits.
417          */
418         if ((host->quirks & SDHCI_QUIRK_BROKEN_SMALL_PIO) &&
419                 (host->data->blocks == 1))
420                 mask = ~0;
421 
422         while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) {
423                 if (host->quirks & SDHCI_QUIRK_PIO_NEEDS_DELAY)
424                         udelay(100);
425 
426                 if (host->data->flags & MMC_DATA_READ)
427                         sdhci_read_block_pio(host);
428                 else
429                         sdhci_write_block_pio(host);
430 
431                 host->blocks--;
432                 if (host->blocks == 0)
433                         break;
434         }
435 
436         DBG("PIO transfer complete.\n");
437 }
438 
439 static char *sdhci_kmap_atomic(struct scatterlist *sg, unsigned long *flags)
440 {
441         local_irq_save(*flags);
442         return kmap_atomic(sg_page(sg)) + sg->offset;
443 }
444 
445 static void sdhci_kunmap_atomic(void *buffer, unsigned long *flags)
446 {
447         kunmap_atomic(buffer);
448         local_irq_restore(*flags);
449 }
450 
451 static void sdhci_set_adma_desc(u8 *desc, u32 addr, int len, unsigned cmd)
452 {
453         __le32 *dataddr = (__le32 __force *)(desc + 4);
454         __le16 *cmdlen = (__le16 __force *)desc;
455 
456         /* SDHCI specification says ADMA descriptors should be 4 byte
457          * aligned, so using 16 or 32bit operations should be safe. */
458 
459         cmdlen[0] = cpu_to_le16(cmd);
460         cmdlen[1] = cpu_to_le16(len);
461 
462         dataddr[0] = cpu_to_le32(addr);
463 }
464 
465 static int sdhci_adma_table_pre(struct sdhci_host *host,
466         struct mmc_data *data)
467 {
468         int direction;
469 
470         u8 *desc;
471         u8 *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, 128 * 4, direction);
493         if (dma_mapping_error(mmc_dev(host->mmc), host->align_addr))
494                 goto fail;
495         BUG_ON(host->align_addr & 0x3);
496 
497         host->sg_count = dma_map_sg(mmc_dev(host->mmc),
498                 data->sg, data->sg_len, direction);
499         if (host->sg_count == 0)
500                 goto unmap_align;
501 
502         desc = host->adma_desc;
503         align = host->align_buffer;
504 
505         align_addr = host->align_addr;
506 
507         for_each_sg(data->sg, sg, host->sg_count, i) {
508                 addr = sg_dma_address(sg);
509                 len = sg_dma_len(sg);
510 
511                 /*
512                  * The SDHCI specification states that ADMA
513                  * addresses must be 32-bit aligned. If they
514                  * aren't, then we use a bounce buffer for
515                  * the (up to three) bytes that screw up the
516                  * alignment.
517                  */
518                 offset = (4 - (addr & 0x3)) & 0x3;
519                 if (offset) {
520                         if (data->flags & MMC_DATA_WRITE) {
521                                 buffer = sdhci_kmap_atomic(sg, &flags);
522                                 WARN_ON(((long)buffer & PAGE_MASK) > (PAGE_SIZE - 3));
523                                 memcpy(align, buffer, offset);
524                                 sdhci_kunmap_atomic(buffer, &flags);
525                         }
526 
527                         /* tran, valid */
528                         sdhci_set_adma_desc(desc, align_addr, offset, 0x21);
529 
530                         BUG_ON(offset > 65536);
531 
532                         align += 4;
533                         align_addr += 4;
534 
535                         desc += 8;
536 
537                         addr += offset;
538                         len -= offset;
539                 }
540 
541                 BUG_ON(len > 65536);
542 
543                 /* tran, valid */
544                 sdhci_set_adma_desc(desc, addr, len, 0x21);
545                 desc += 8;
546 
547                 /*
548                  * If this triggers then we have a calculation bug
549                  * somewhere. :/
550                  */
551                 WARN_ON((desc - host->adma_desc) > ADMA_SIZE);
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_desc) {
559                         desc -= 8;
560                         desc[0] |= 0x2; /* end */
561                 }
562         } else {
563                 /*
564                 * Add a terminating entry.
565                 */
566 
567                 /* nop, end, valid */
568                 sdhci_set_adma_desc(desc, 0, 0, 0x3);
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, 128 * 4, direction);
577         }
578 
579         return 0;
580 
581 unmap_align:
582         dma_unmap_single(mmc_dev(host->mmc), host->align_addr,
583                 128 * 4, 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         u8 *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                 128 * 4, 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) & 3) {
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) & 0x3) {
624                                 size = 4 - (sg_dma_address(sg) & 0x3);
625 
626                                 buffer = sdhci_kmap_atomic(sg, &flags);
627                                 WARN_ON(((long)buffer & PAGE_MASK) > (PAGE_SIZE - 3));
628                                 memcpy(buffer, align, size);
629                                 sdhci_kunmap_atomic(buffer, &flags);
630 
631                                 align += 4;
632                         }
633                 }
634         }
635 
636         dma_unmap_sg(mmc_dev(host->mmc), data->sg,
637                 data->sg_len, direction);
638 }
639 
640 static u8 sdhci_calc_timeout(struct sdhci_host *host, struct mmc_command *cmd)
641 {
642         u8 count;
643         struct mmc_data *data = cmd->data;
644         unsigned target_timeout, current_timeout;
645 
646         /*
647          * If the host controller provides us with an incorrect timeout
648          * value, just skip the check and use 0xE.  The hardware may take
649          * longer to time out, but that's much better than having a too-short
650          * timeout value.
651          */
652         if (host->quirks & SDHCI_QUIRK_BROKEN_TIMEOUT_VAL)
653                 return 0xE;
654 
655         /* Unspecified timeout, assume max */
656         if (!data && !cmd->busy_timeout)
657                 return 0xE;
658 
659         /* timeout in us */
660         if (!data)
661                 target_timeout = cmd->busy_timeout * 1000;
662         else {
663                 target_timeout = data->timeout_ns / 1000;
664                 if (host->clock)
665                         target_timeout += data->timeout_clks / host->clock;
666         }
667 
668         /*
669          * Figure out needed cycles.
670          * We do this in steps in order to fit inside a 32 bit int.
671          * The first step is the minimum timeout, which will have a
672          * minimum resolution of 6 bits:
673          * (1) 2^13*1000 > 2^22,
674          * (2) host->timeout_clk < 2^16
675          *     =>
676          *     (1) / (2) > 2^6
677          */
678         count = 0;
679         current_timeout = (1 << 13) * 1000 / host->timeout_clk;
680         while (current_timeout < target_timeout) {
681                 count++;
682                 current_timeout <<= 1;
683                 if (count >= 0xF)
684                         break;
685         }
686 
687         if (count >= 0xF) {
688                 DBG("%s: Too large timeout 0x%x requested for CMD%d!\n",
689                     mmc_hostname(host->mmc), count, cmd->opcode);
690                 count = 0xE;
691         }
692 
693         return count;
694 }
695 
696 static void sdhci_set_transfer_irqs(struct sdhci_host *host)
697 {
698         u32 pio_irqs = SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL;
699         u32 dma_irqs = SDHCI_INT_DMA_END | SDHCI_INT_ADMA_ERROR;
700 
701         if (host->flags & SDHCI_REQ_USE_DMA)
702                 host->ier = (host->ier & ~pio_irqs) | dma_irqs;
703         else
704                 host->ier = (host->ier & ~dma_irqs) | pio_irqs;
705 
706         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
707         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
708 }
709 
710 static void sdhci_set_timeout(struct sdhci_host *host, struct mmc_command *cmd)
711 {
712         u8 count;
713 
714         if (host->ops->set_timeout) {
715                 host->ops->set_timeout(host, cmd);
716         } else {
717                 count = sdhci_calc_timeout(host, cmd);
718                 sdhci_writeb(host, count, SDHCI_TIMEOUT_CONTROL);
719         }
720 }
721 
722 static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd)
723 {
724         u8 ctrl;
725         struct mmc_data *data = cmd->data;
726         int ret;
727 
728         WARN_ON(host->data);
729 
730         if (data || (cmd->flags & MMC_RSP_BUSY))
731                 sdhci_set_timeout(host, cmd);
732 
733         if (!data)
734                 return;
735 
736         /* Sanity checks */
737         BUG_ON(data->blksz * data->blocks > 524288);
738         BUG_ON(data->blksz > host->mmc->max_blk_size);
739         BUG_ON(data->blocks > 65535);
740 
741         host->data = data;
742         host->data_early = 0;
743         host->data->bytes_xfered = 0;
744 
745         if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA))
746                 host->flags |= SDHCI_REQ_USE_DMA;
747 
748         /*
749          * FIXME: This doesn't account for merging when mapping the
750          * scatterlist.
751          */
752         if (host->flags & SDHCI_REQ_USE_DMA) {
753                 int broken, i;
754                 struct scatterlist *sg;
755 
756                 broken = 0;
757                 if (host->flags & SDHCI_USE_ADMA) {
758                         if (host->quirks & SDHCI_QUIRK_32BIT_ADMA_SIZE)
759                                 broken = 1;
760                 } else {
761                         if (host->quirks & SDHCI_QUIRK_32BIT_DMA_SIZE)
762                                 broken = 1;
763                 }
764 
765                 if (unlikely(broken)) {
766                         for_each_sg(data->sg, sg, data->sg_len, i) {
767                                 if (sg->length & 0x3) {
768                                         DBG("Reverting to PIO because of "
769                                                 "transfer size (%d)\n",
770                                                 sg->length);
771                                         host->flags &= ~SDHCI_REQ_USE_DMA;
772                                         break;
773                                 }
774                         }
775                 }
776         }
777 
778         /*
779          * The assumption here being that alignment is the same after
780          * translation to device address space.
781          */
782         if (host->flags & SDHCI_REQ_USE_DMA) {
783                 int broken, i;
784                 struct scatterlist *sg;
785 
786                 broken = 0;
787                 if (host->flags & SDHCI_USE_ADMA) {
788                         /*
789                          * As we use 3 byte chunks to work around
790                          * alignment problems, we need to check this
791                          * quirk.
792                          */
793                         if (host->quirks & SDHCI_QUIRK_32BIT_ADMA_SIZE)
794                                 broken = 1;
795                 } else {
796                         if (host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR)
797                                 broken = 1;
798                 }
799 
800                 if (unlikely(broken)) {
801                         for_each_sg(data->sg, sg, data->sg_len, i) {
802                                 if (sg->offset & 0x3) {
803                                         DBG("Reverting to PIO because of "
804                                                 "bad alignment\n");
805                                         host->flags &= ~SDHCI_REQ_USE_DMA;
806                                         break;
807                                 }
808                         }
809                 }
810         }
811 
812         if (host->flags & SDHCI_REQ_USE_DMA) {
813                 if (host->flags & SDHCI_USE_ADMA) {
814                         ret = sdhci_adma_table_pre(host, data);
815                         if (ret) {
816                                 /*
817                                  * This only happens when someone fed
818                                  * us an invalid request.
819                                  */
820                                 WARN_ON(1);
821                                 host->flags &= ~SDHCI_REQ_USE_DMA;
822                         } else {
823                                 sdhci_writel(host, host->adma_addr,
824                                         SDHCI_ADMA_ADDRESS);
825                         }
826                 } else {
827                         int sg_cnt;
828 
829                         sg_cnt = dma_map_sg(mmc_dev(host->mmc),
830                                         data->sg, data->sg_len,
831                                         (data->flags & MMC_DATA_READ) ?
832                                                 DMA_FROM_DEVICE :
833                                                 DMA_TO_DEVICE);
834                         if (sg_cnt == 0) {
835                                 /*
836                                  * This only happens when someone fed
837                                  * us an invalid request.
838                                  */
839                                 WARN_ON(1);
840                                 host->flags &= ~SDHCI_REQ_USE_DMA;
841                         } else {
842                                 WARN_ON(sg_cnt != 1);
843                                 sdhci_writel(host, sg_dma_address(data->sg),
844                                         SDHCI_DMA_ADDRESS);
845                         }
846                 }
847         }
848 
849         /*
850          * Always adjust the DMA selection as some controllers
851          * (e.g. JMicron) can't do PIO properly when the selection
852          * is ADMA.
853          */
854         if (host->version >= SDHCI_SPEC_200) {
855                 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
856                 ctrl &= ~SDHCI_CTRL_DMA_MASK;
857                 if ((host->flags & SDHCI_REQ_USE_DMA) &&
858                         (host->flags & SDHCI_USE_ADMA))
859                         ctrl |= SDHCI_CTRL_ADMA32;
860                 else
861                         ctrl |= SDHCI_CTRL_SDMA;
862                 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
863         }
864 
865         if (!(host->flags & SDHCI_REQ_USE_DMA)) {
866                 int flags;
867 
868                 flags = SG_MITER_ATOMIC;
869                 if (host->data->flags & MMC_DATA_READ)
870                         flags |= SG_MITER_TO_SG;
871                 else
872                         flags |= SG_MITER_FROM_SG;
873                 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
874                 host->blocks = data->blocks;
875         }
876 
877         sdhci_set_transfer_irqs(host);
878 
879         /* Set the DMA boundary value and block size */
880         sdhci_writew(host, SDHCI_MAKE_BLKSZ(SDHCI_DEFAULT_BOUNDARY_ARG,
881                 data->blksz), SDHCI_BLOCK_SIZE);
882         sdhci_writew(host, data->blocks, SDHCI_BLOCK_COUNT);
883 }
884 
885 static void sdhci_set_transfer_mode(struct sdhci_host *host,
886         struct mmc_command *cmd)
887 {
888         u16 mode;
889         struct mmc_data *data = cmd->data;
890 
891         if (data == NULL) {
892                 /* clear Auto CMD settings for no data CMDs */
893                 mode = sdhci_readw(host, SDHCI_TRANSFER_MODE);
894                 sdhci_writew(host, mode & ~(SDHCI_TRNS_AUTO_CMD12 |
895                                 SDHCI_TRNS_AUTO_CMD23), SDHCI_TRANSFER_MODE);
896                 return;
897         }
898 
899         WARN_ON(!host->data);
900 
901         mode = SDHCI_TRNS_BLK_CNT_EN;
902         if (mmc_op_multi(cmd->opcode) || data->blocks > 1) {
903                 mode |= SDHCI_TRNS_MULTI;
904                 /*
905                  * If we are sending CMD23, CMD12 never gets sent
906                  * on successful completion (so no Auto-CMD12).
907                  */
908                 if (!host->mrq->sbc && (host->flags & SDHCI_AUTO_CMD12))
909                         mode |= SDHCI_TRNS_AUTO_CMD12;
910                 else if (host->mrq->sbc && (host->flags & SDHCI_AUTO_CMD23)) {
911                         mode |= SDHCI_TRNS_AUTO_CMD23;
912                         sdhci_writel(host, host->mrq->sbc->arg, SDHCI_ARGUMENT2);
913                 }
914         }
915 
916         if (data->flags & MMC_DATA_READ)
917                 mode |= SDHCI_TRNS_READ;
918         if (host->flags & SDHCI_REQ_USE_DMA)
919                 mode |= SDHCI_TRNS_DMA;
920 
921         sdhci_writew(host, mode, SDHCI_TRANSFER_MODE);
922 }
923 
924 static void sdhci_finish_data(struct sdhci_host *host)
925 {
926         struct mmc_data *data;
927 
928         BUG_ON(!host->data);
929 
930         data = host->data;
931         host->data = NULL;
932 
933         if (host->flags & SDHCI_REQ_USE_DMA) {
934                 if (host->flags & SDHCI_USE_ADMA)
935                         sdhci_adma_table_post(host, data);
936                 else {
937                         dma_unmap_sg(mmc_dev(host->mmc), data->sg,
938                                 data->sg_len, (data->flags & MMC_DATA_READ) ?
939                                         DMA_FROM_DEVICE : DMA_TO_DEVICE);
940                 }
941         }
942 
943         /*
944          * The specification states that the block count register must
945          * be updated, but it does not specify at what point in the
946          * data flow. That makes the register entirely useless to read
947          * back so we have to assume that nothing made it to the card
948          * in the event of an error.
949          */
950         if (data->error)
951                 data->bytes_xfered = 0;
952         else
953                 data->bytes_xfered = data->blksz * data->blocks;
954 
955         /*
956          * Need to send CMD12 if -
957          * a) open-ended multiblock transfer (no CMD23)
958          * b) error in multiblock transfer
959          */
960         if (data->stop &&
961             (data->error ||
962              !host->mrq->sbc)) {
963 
964                 /*
965                  * The controller needs a reset of internal state machines
966                  * upon error conditions.
967                  */
968                 if (data->error) {
969                         sdhci_do_reset(host, SDHCI_RESET_CMD);
970                         sdhci_do_reset(host, SDHCI_RESET_DATA);
971                 }
972 
973                 sdhci_send_command(host, data->stop);
974         } else
975                 tasklet_schedule(&host->finish_tasklet);
976 }
977 
978 void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
979 {
980         int flags;
981         u32 mask;
982         unsigned long timeout;
983 
984         WARN_ON(host->cmd);
985 
986         /* Wait max 10 ms */
987         timeout = 10;
988 
989         mask = SDHCI_CMD_INHIBIT;
990         if ((cmd->data != NULL) || (cmd->flags & MMC_RSP_BUSY))
991                 mask |= SDHCI_DATA_INHIBIT;
992 
993         /* We shouldn't wait for data inihibit for stop commands, even
994            though they might use busy signaling */
995         if (host->mrq->data && (cmd == host->mrq->data->stop))
996                 mask &= ~SDHCI_DATA_INHIBIT;
997 
998         while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) {
999                 if (timeout == 0) {
1000                         pr_err("%s: Controller never released "
1001                                 "inhibit bit(s).\n", mmc_hostname(host->mmc));
1002                         sdhci_dumpregs(host);
1003                         cmd->error = -EIO;
1004                         tasklet_schedule(&host->finish_tasklet);
1005                         return;
1006                 }
1007                 timeout--;
1008                 mdelay(1);
1009         }
1010 
1011         timeout = jiffies;
1012         if (!cmd->data && cmd->busy_timeout > 9000)
1013                 timeout += DIV_ROUND_UP(cmd->busy_timeout, 1000) * HZ + HZ;
1014         else
1015                 timeout += 10 * HZ;
1016         mod_timer(&host->timer, timeout);
1017 
1018         host->cmd = cmd;
1019         host->busy_handle = 0;
1020 
1021         sdhci_prepare_data(host, cmd);
1022 
1023         sdhci_writel(host, cmd->arg, SDHCI_ARGUMENT);
1024 
1025         sdhci_set_transfer_mode(host, cmd);
1026 
1027         if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
1028                 pr_err("%s: Unsupported response type!\n",
1029                         mmc_hostname(host->mmc));
1030                 cmd->error = -EINVAL;
1031                 tasklet_schedule(&host->finish_tasklet);
1032                 return;
1033         }
1034 
1035         if (!(cmd->flags & MMC_RSP_PRESENT))
1036                 flags = SDHCI_CMD_RESP_NONE;
1037         else if (cmd->flags & MMC_RSP_136)
1038                 flags = SDHCI_CMD_RESP_LONG;
1039         else if (cmd->flags & MMC_RSP_BUSY)
1040                 flags = SDHCI_CMD_RESP_SHORT_BUSY;
1041         else
1042                 flags = SDHCI_CMD_RESP_SHORT;
1043 
1044         if (cmd->flags & MMC_RSP_CRC)
1045                 flags |= SDHCI_CMD_CRC;
1046         if (cmd->flags & MMC_RSP_OPCODE)
1047                 flags |= SDHCI_CMD_INDEX;
1048 
1049         /* CMD19 is special in that the Data Present Select should be set */
1050         if (cmd->data || cmd->opcode == MMC_SEND_TUNING_BLOCK ||
1051             cmd->opcode == MMC_SEND_TUNING_BLOCK_HS200)
1052                 flags |= SDHCI_CMD_DATA;
1053 
1054         sdhci_writew(host, SDHCI_MAKE_CMD(cmd->opcode, flags), SDHCI_COMMAND);
1055 }
1056 EXPORT_SYMBOL_GPL(sdhci_send_command);
1057 
1058 static void sdhci_finish_command(struct sdhci_host *host)
1059 {
1060         int i;
1061 
1062         BUG_ON(host->cmd == NULL);
1063 
1064         if (host->cmd->flags & MMC_RSP_PRESENT) {
1065                 if (host->cmd->flags & MMC_RSP_136) {
1066                         /* CRC is stripped so we need to do some shifting. */
1067                         for (i = 0;i < 4;i++) {
1068                                 host->cmd->resp[i] = sdhci_readl(host,
1069                                         SDHCI_RESPONSE + (3-i)*4) << 8;
1070                                 if (i != 3)
1071                                         host->cmd->resp[i] |=
1072                                                 sdhci_readb(host,
1073                                                 SDHCI_RESPONSE + (3-i)*4-1);
1074                         }
1075                 } else {
1076                         host->cmd->resp[0] = sdhci_readl(host, SDHCI_RESPONSE);
1077                 }
1078         }
1079 
1080         host->cmd->error = 0;
1081 
1082         /* Finished CMD23, now send actual command. */
1083         if (host->cmd == host->mrq->sbc) {
1084                 host->cmd = NULL;
1085                 sdhci_send_command(host, host->mrq->cmd);
1086         } else {
1087 
1088                 /* Processed actual command. */
1089                 if (host->data && host->data_early)
1090                         sdhci_finish_data(host);
1091 
1092                 if (!host->cmd->data)
1093                         tasklet_schedule(&host->finish_tasklet);
1094 
1095                 host->cmd = NULL;
1096         }
1097 }
1098 
1099 static u16 sdhci_get_preset_value(struct sdhci_host *host)
1100 {
1101         u16 preset = 0;
1102 
1103         switch (host->timing) {
1104         case MMC_TIMING_UHS_SDR12:
1105                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR12);
1106                 break;
1107         case MMC_TIMING_UHS_SDR25:
1108                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR25);
1109                 break;
1110         case MMC_TIMING_UHS_SDR50:
1111                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR50);
1112                 break;
1113         case MMC_TIMING_UHS_SDR104:
1114         case MMC_TIMING_MMC_HS200:
1115                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR104);
1116                 break;
1117         case MMC_TIMING_UHS_DDR50:
1118                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_DDR50);
1119                 break;
1120         default:
1121                 pr_warn("%s: Invalid UHS-I mode selected\n",
1122                         mmc_hostname(host->mmc));
1123                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR12);
1124                 break;
1125         }
1126         return preset;
1127 }
1128 
1129 void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
1130 {
1131         int div = 0; /* Initialized for compiler warning */
1132         int real_div = div, clk_mul = 1;
1133         u16 clk = 0;
1134         unsigned long timeout;
1135 
1136         host->mmc->actual_clock = 0;
1137 
1138         sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
1139 
1140         if (clock == 0)
1141                 return;
1142 
1143         if (host->version >= SDHCI_SPEC_300) {
1144                 if (host->preset_enabled) {
1145                         u16 pre_val;
1146 
1147                         clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1148                         pre_val = sdhci_get_preset_value(host);
1149                         div = (pre_val & SDHCI_PRESET_SDCLK_FREQ_MASK)
1150                                 >> SDHCI_PRESET_SDCLK_FREQ_SHIFT;
1151                         if (host->clk_mul &&
1152                                 (pre_val & SDHCI_PRESET_CLKGEN_SEL_MASK)) {
1153                                 clk = SDHCI_PROG_CLOCK_MODE;
1154                                 real_div = div + 1;
1155                                 clk_mul = host->clk_mul;
1156                         } else {
1157                                 real_div = max_t(int, 1, div << 1);
1158                         }
1159                         goto clock_set;
1160                 }
1161 
1162                 /*
1163                  * Check if the Host Controller supports Programmable Clock
1164                  * Mode.
1165                  */
1166                 if (host->clk_mul) {
1167                         for (div = 1; div <= 1024; div++) {
1168                                 if ((host->max_clk * host->clk_mul / div)
1169                                         <= clock)
1170                                         break;
1171                         }
1172                         /*
1173                          * Set Programmable Clock Mode in the Clock
1174                          * Control register.
1175                          */
1176                         clk = SDHCI_PROG_CLOCK_MODE;
1177                         real_div = div;
1178                         clk_mul = host->clk_mul;
1179                         div--;
1180                 } else {
1181                         /* Version 3.00 divisors must be a multiple of 2. */
1182                         if (host->max_clk <= clock)
1183                                 div = 1;
1184                         else {
1185                                 for (div = 2; div < SDHCI_MAX_DIV_SPEC_300;
1186                                      div += 2) {
1187                                         if ((host->max_clk / div) <= clock)
1188                                                 break;
1189                                 }
1190                         }
1191                         real_div = div;
1192                         div >>= 1;
1193                 }
1194         } else {
1195                 /* Version 2.00 divisors must be a power of 2. */
1196                 for (div = 1; div < SDHCI_MAX_DIV_SPEC_200; div *= 2) {
1197                         if ((host->max_clk / div) <= clock)
1198                                 break;
1199                 }
1200                 real_div = div;
1201                 div >>= 1;
1202         }
1203 
1204 clock_set:
1205         if (real_div)
1206                 host->mmc->actual_clock = (host->max_clk * clk_mul) / real_div;
1207         clk |= (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT;
1208         clk |= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN)
1209                 << SDHCI_DIVIDER_HI_SHIFT;
1210         clk |= SDHCI_CLOCK_INT_EN;
1211         sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1212 
1213         /* Wait max 20 ms */
1214         timeout = 20;
1215         while (!((clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL))
1216                 & SDHCI_CLOCK_INT_STABLE)) {
1217                 if (timeout == 0) {
1218                         pr_err("%s: Internal clock never "
1219                                 "stabilised.\n", mmc_hostname(host->mmc));
1220                         sdhci_dumpregs(host);
1221                         return;
1222                 }
1223                 timeout--;
1224                 mdelay(1);
1225         }
1226 
1227         clk |= SDHCI_CLOCK_CARD_EN;
1228         sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1229 }
1230 EXPORT_SYMBOL_GPL(sdhci_set_clock);
1231 
1232 static void sdhci_set_power(struct sdhci_host *host, unsigned char mode,
1233                             unsigned short vdd)
1234 {
1235         struct mmc_host *mmc = host->mmc;
1236         u8 pwr = 0;
1237 
1238         if (!IS_ERR(mmc->supply.vmmc)) {
1239                 spin_unlock_irq(&host->lock);
1240                 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
1241                 spin_lock_irq(&host->lock);
1242                 return;
1243         }
1244 
1245         if (mode != MMC_POWER_OFF) {
1246                 switch (1 << vdd) {
1247                 case MMC_VDD_165_195:
1248                         pwr = SDHCI_POWER_180;
1249                         break;
1250                 case MMC_VDD_29_30:
1251                 case MMC_VDD_30_31:
1252                         pwr = SDHCI_POWER_300;
1253                         break;
1254                 case MMC_VDD_32_33:
1255                 case MMC_VDD_33_34:
1256                         pwr = SDHCI_POWER_330;
1257                         break;
1258                 default:
1259                         BUG();
1260                 }
1261         }
1262 
1263         if (host->pwr == pwr)
1264                 return;
1265 
1266         host->pwr = pwr;
1267 
1268         if (pwr == 0) {
1269                 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
1270                 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
1271                         sdhci_runtime_pm_bus_off(host);
1272                 vdd = 0;
1273         } else {
1274                 /*
1275                  * Spec says that we should clear the power reg before setting
1276                  * a new value. Some controllers don't seem to like this though.
1277                  */
1278                 if (!(host->quirks & SDHCI_QUIRK_SINGLE_POWER_WRITE))
1279                         sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
1280 
1281                 /*
1282                  * At least the Marvell CaFe chip gets confused if we set the
1283                  * voltage and set turn on power at the same time, so set the
1284                  * voltage first.
1285                  */
1286                 if (host->quirks & SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER)
1287                         sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
1288 
1289                 pwr |= SDHCI_POWER_ON;
1290 
1291                 sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
1292 
1293                 if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
1294                         sdhci_runtime_pm_bus_on(host);
1295 
1296                 /*
1297                  * Some controllers need an extra 10ms delay of 10ms before
1298                  * they can apply clock after applying power
1299                  */
1300                 if (host->quirks & SDHCI_QUIRK_DELAY_AFTER_POWER)
1301                         mdelay(10);
1302         }
1303 }
1304 
1305 /*****************************************************************************\
1306  *                                                                           *
1307  * MMC callbacks                                                             *
1308  *                                                                           *
1309 \*****************************************************************************/
1310 
1311 static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
1312 {
1313         struct sdhci_host *host;
1314         int present;
1315         unsigned long flags;
1316         u32 tuning_opcode;
1317 
1318         host = mmc_priv(mmc);
1319 
1320         sdhci_runtime_pm_get(host);
1321 
1322         spin_lock_irqsave(&host->lock, flags);
1323 
1324         WARN_ON(host->mrq != NULL);
1325 
1326 #ifndef SDHCI_USE_LEDS_CLASS
1327         sdhci_activate_led(host);
1328 #endif
1329 
1330         /*
1331          * Ensure we don't send the STOP for non-SET_BLOCK_COUNTED
1332          * requests if Auto-CMD12 is enabled.
1333          */
1334         if (!mrq->sbc && (host->flags & SDHCI_AUTO_CMD12)) {
1335                 if (mrq->stop) {
1336                         mrq->data->stop = NULL;
1337                         mrq->stop = NULL;
1338                 }
1339         }
1340 
1341         host->mrq = mrq;
1342 
1343         /*
1344          * Firstly check card presence from cd-gpio.  The return could
1345          * be one of the following possibilities:
1346          *     negative: cd-gpio is not available
1347          *     zero: cd-gpio is used, and card is removed
1348          *     one: cd-gpio is used, and card is present
1349          */
1350         present = mmc_gpio_get_cd(host->mmc);
1351         if (present < 0) {
1352                 /* If polling, assume that the card is always present. */
1353                 if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
1354                         present = 1;
1355                 else
1356                         present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
1357                                         SDHCI_CARD_PRESENT;
1358         }
1359 
1360         if (!present || host->flags & SDHCI_DEVICE_DEAD) {
1361                 host->mrq->cmd->error = -ENOMEDIUM;
1362                 tasklet_schedule(&host->finish_tasklet);
1363         } else {
1364                 u32 present_state;
1365 
1366                 present_state = sdhci_readl(host, SDHCI_PRESENT_STATE);
1367                 /*
1368                  * Check if the re-tuning timer has already expired and there
1369                  * is no on-going data transfer and DAT0 is not busy. If so,
1370                  * we need to execute tuning procedure before sending command.
1371                  */
1372                 if ((host->flags & SDHCI_NEEDS_RETUNING) &&
1373                     !(present_state & (SDHCI_DOING_WRITE | SDHCI_DOING_READ)) &&
1374                     (present_state & SDHCI_DATA_0_LVL_MASK)) {
1375                         if (mmc->card) {
1376                                 /* eMMC uses cmd21 but sd and sdio use cmd19 */
1377                                 tuning_opcode =
1378                                         mmc->card->type == MMC_TYPE_MMC ?
1379                                         MMC_SEND_TUNING_BLOCK_HS200 :
1380                                         MMC_SEND_TUNING_BLOCK;
1381 
1382                                 /* Here we need to set the host->mrq to NULL,
1383                                  * in case the pending finish_tasklet
1384                                  * finishes it incorrectly.
1385                                  */
1386                                 host->mrq = NULL;
1387 
1388                                 spin_unlock_irqrestore(&host->lock, flags);
1389                                 sdhci_execute_tuning(mmc, tuning_opcode);
1390                                 spin_lock_irqsave(&host->lock, flags);
1391 
1392                                 /* Restore original mmc_request structure */
1393                                 host->mrq = mrq;
1394                         }
1395                 }
1396 
1397                 if (mrq->sbc && !(host->flags & SDHCI_AUTO_CMD23))
1398                         sdhci_send_command(host, mrq->sbc);
1399                 else
1400                         sdhci_send_command(host, mrq->cmd);
1401         }
1402 
1403         mmiowb();
1404         spin_unlock_irqrestore(&host->lock, flags);
1405 }
1406 
1407 void sdhci_set_bus_width(struct sdhci_host *host, int width)
1408 {
1409         u8 ctrl;
1410 
1411         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
1412         if (width == MMC_BUS_WIDTH_8) {
1413                 ctrl &= ~SDHCI_CTRL_4BITBUS;
1414                 if (host->version >= SDHCI_SPEC_300)
1415                         ctrl |= SDHCI_CTRL_8BITBUS;
1416         } else {
1417                 if (host->version >= SDHCI_SPEC_300)
1418                         ctrl &= ~SDHCI_CTRL_8BITBUS;
1419                 if (width == MMC_BUS_WIDTH_4)
1420                         ctrl |= SDHCI_CTRL_4BITBUS;
1421                 else
1422                         ctrl &= ~SDHCI_CTRL_4BITBUS;
1423         }
1424         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1425 }
1426 EXPORT_SYMBOL_GPL(sdhci_set_bus_width);
1427 
1428 void sdhci_set_uhs_signaling(struct sdhci_host *host, unsigned timing)
1429 {
1430         u16 ctrl_2;
1431 
1432         ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1433         /* Select Bus Speed Mode for host */
1434         ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
1435         if ((timing == MMC_TIMING_MMC_HS200) ||
1436             (timing == MMC_TIMING_UHS_SDR104))
1437                 ctrl_2 |= SDHCI_CTRL_UHS_SDR104;
1438         else if (timing == MMC_TIMING_UHS_SDR12)
1439                 ctrl_2 |= SDHCI_CTRL_UHS_SDR12;
1440         else if (timing == MMC_TIMING_UHS_SDR25)
1441                 ctrl_2 |= SDHCI_CTRL_UHS_SDR25;
1442         else if (timing == MMC_TIMING_UHS_SDR50)
1443                 ctrl_2 |= SDHCI_CTRL_UHS_SDR50;
1444         else if ((timing == MMC_TIMING_UHS_DDR50) ||
1445                  (timing == MMC_TIMING_MMC_DDR52))
1446                 ctrl_2 |= SDHCI_CTRL_UHS_DDR50;
1447         sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
1448 }
1449 EXPORT_SYMBOL_GPL(sdhci_set_uhs_signaling);
1450 
1451 static void sdhci_do_set_ios(struct sdhci_host *host, struct mmc_ios *ios)
1452 {
1453         unsigned long flags;
1454         u8 ctrl;
1455         struct mmc_host *mmc = host->mmc;
1456 
1457         spin_lock_irqsave(&host->lock, flags);
1458 
1459         if (host->flags & SDHCI_DEVICE_DEAD) {
1460                 spin_unlock_irqrestore(&host->lock, flags);
1461                 if (!IS_ERR(mmc->supply.vmmc) &&
1462                     ios->power_mode == MMC_POWER_OFF)
1463                         mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
1464                 return;
1465         }
1466 
1467         /*
1468          * Reset the chip on each power off.
1469          * Should clear out any weird states.
1470          */
1471         if (ios->power_mode == MMC_POWER_OFF) {
1472                 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
1473                 sdhci_reinit(host);
1474         }
1475 
1476         if (host->version >= SDHCI_SPEC_300 &&
1477                 (ios->power_mode == MMC_POWER_UP) &&
1478                 !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN))
1479                 sdhci_enable_preset_value(host, false);
1480 
1481         if (!ios->clock || ios->clock != host->clock) {
1482                 host->ops->set_clock(host, ios->clock);
1483                 host->clock = ios->clock;
1484 
1485                 if (host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK &&
1486                     host->clock) {
1487                         host->timeout_clk = host->mmc->actual_clock ?
1488                                                 host->mmc->actual_clock / 1000 :
1489                                                 host->clock / 1000;
1490                         host->mmc->max_busy_timeout =
1491                                 host->ops->get_max_timeout_count ?
1492                                 host->ops->get_max_timeout_count(host) :
1493                                 1 << 27;
1494                         host->mmc->max_busy_timeout /= host->timeout_clk;
1495                 }
1496         }
1497 
1498         sdhci_set_power(host, ios->power_mode, ios->vdd);
1499 
1500         if (host->ops->platform_send_init_74_clocks)
1501                 host->ops->platform_send_init_74_clocks(host, ios->power_mode);
1502 
1503         host->ops->set_bus_width(host, ios->bus_width);
1504 
1505         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
1506 
1507         if ((ios->timing == MMC_TIMING_SD_HS ||
1508              ios->timing == MMC_TIMING_MMC_HS)
1509             && !(host->quirks & SDHCI_QUIRK_NO_HISPD_BIT))
1510                 ctrl |= SDHCI_CTRL_HISPD;
1511         else
1512                 ctrl &= ~SDHCI_CTRL_HISPD;
1513 
1514         if (host->version >= SDHCI_SPEC_300) {
1515                 u16 clk, ctrl_2;
1516 
1517                 /* In case of UHS-I modes, set High Speed Enable */
1518                 if ((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_C)
1537                                 ctrl_2 |= SDHCI_CTRL_DRV_TYPE_C;
1538 
1539                         sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
1540                 } else {
1541                         /*
1542                          * According to SDHC Spec v3.00, if the Preset Value
1543                          * Enable in the Host Control 2 register is set, we
1544                          * need to reset SD Clock Enable before changing High
1545                          * Speed Enable to avoid generating clock gliches.
1546                          */
1547 
1548                         /* Reset SD Clock Enable */
1549                         clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1550                         clk &= ~SDHCI_CLOCK_CARD_EN;
1551                         sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1552 
1553                         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1554 
1555                         /* Re-enable SD Clock */
1556                         host->ops->set_clock(host, host->clock);
1557                 }
1558 
1559                 /* Reset SD Clock Enable */
1560                 clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
1561                 clk &= ~SDHCI_CLOCK_CARD_EN;
1562                 sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
1563 
1564                 host->ops->set_uhs_signaling(host, ios->timing);
1565                 host->timing = ios->timing;
1566 
1567                 if (!(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN) &&
1568                                 ((ios->timing == MMC_TIMING_UHS_SDR12) ||
1569                                  (ios->timing == MMC_TIMING_UHS_SDR25) ||
1570                                  (ios->timing == MMC_TIMING_UHS_SDR50) ||
1571                                  (ios->timing == MMC_TIMING_UHS_SDR104) ||
1572                                  (ios->timing == MMC_TIMING_UHS_DDR50))) {
1573                         u16 preset;
1574 
1575                         sdhci_enable_preset_value(host, true);
1576                         preset = sdhci_get_preset_value(host);
1577                         ios->drv_type = (preset & SDHCI_PRESET_DRV_MASK)
1578                                 >> SDHCI_PRESET_DRV_SHIFT;
1579                 }
1580 
1581                 /* Re-enable SD Clock */
1582                 host->ops->set_clock(host, host->clock);
1583         } else
1584                 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
1585 
1586         /*
1587          * Some (ENE) controllers go apeshit on some ios operation,
1588          * signalling timeout and CRC errors even on CMD0. Resetting
1589          * it on each ios seems to solve the problem.
1590          */
1591         if(host->quirks & SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS)
1592                 sdhci_do_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
1593 
1594         mmiowb();
1595         spin_unlock_irqrestore(&host->lock, flags);
1596 }
1597 
1598 static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1599 {
1600         struct sdhci_host *host = mmc_priv(mmc);
1601 
1602         sdhci_runtime_pm_get(host);
1603         sdhci_do_set_ios(host, ios);
1604         sdhci_runtime_pm_put(host);
1605 }
1606 
1607 static int sdhci_do_get_cd(struct sdhci_host *host)
1608 {
1609         int gpio_cd = mmc_gpio_get_cd(host->mmc);
1610 
1611         if (host->flags & SDHCI_DEVICE_DEAD)
1612                 return 0;
1613 
1614         /* If polling/nonremovable, assume that the card is always present. */
1615         if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) ||
1616             (host->mmc->caps & MMC_CAP_NONREMOVABLE))
1617                 return 1;
1618 
1619         /* Try slot gpio detect */
1620         if (!IS_ERR_VALUE(gpio_cd))
1621                 return !!gpio_cd;
1622 
1623         /* Host native card detect */
1624         return !!(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT);
1625 }
1626 
1627 static int sdhci_get_cd(struct mmc_host *mmc)
1628 {
1629         struct sdhci_host *host = mmc_priv(mmc);
1630         int ret;
1631 
1632         sdhci_runtime_pm_get(host);
1633         ret = sdhci_do_get_cd(host);
1634         sdhci_runtime_pm_put(host);
1635         return ret;
1636 }
1637 
1638 static int sdhci_check_ro(struct sdhci_host *host)
1639 {
1640         unsigned long flags;
1641         int is_readonly;
1642 
1643         spin_lock_irqsave(&host->lock, flags);
1644 
1645         if (host->flags & SDHCI_DEVICE_DEAD)
1646                 is_readonly = 0;
1647         else if (host->ops->get_ro)
1648                 is_readonly = host->ops->get_ro(host);
1649         else
1650                 is_readonly = !(sdhci_readl(host, SDHCI_PRESENT_STATE)
1651                                 & SDHCI_WRITE_PROTECT);
1652 
1653         spin_unlock_irqrestore(&host->lock, flags);
1654 
1655         /* This quirk needs to be replaced by a callback-function later */
1656         return host->quirks & SDHCI_QUIRK_INVERTED_WRITE_PROTECT ?
1657                 !is_readonly : is_readonly;
1658 }
1659 
1660 #define SAMPLE_COUNT    5
1661 
1662 static int sdhci_do_get_ro(struct sdhci_host *host)
1663 {
1664         int i, ro_count;
1665 
1666         if (!(host->quirks & SDHCI_QUIRK_UNSTABLE_RO_DETECT))
1667                 return sdhci_check_ro(host);
1668 
1669         ro_count = 0;
1670         for (i = 0; i < SAMPLE_COUNT; i++) {
1671                 if (sdhci_check_ro(host)) {
1672                         if (++ro_count > SAMPLE_COUNT / 2)
1673                                 return 1;
1674                 }
1675                 msleep(30);
1676         }
1677         return 0;
1678 }
1679 
1680 static void sdhci_hw_reset(struct mmc_host *mmc)
1681 {
1682         struct sdhci_host *host = mmc_priv(mmc);
1683 
1684         if (host->ops && host->ops->hw_reset)
1685                 host->ops->hw_reset(host);
1686 }
1687 
1688 static int sdhci_get_ro(struct mmc_host *mmc)
1689 {
1690         struct sdhci_host *host = mmc_priv(mmc);
1691         int ret;
1692 
1693         sdhci_runtime_pm_get(host);
1694         ret = sdhci_do_get_ro(host);
1695         sdhci_runtime_pm_put(host);
1696         return ret;
1697 }
1698 
1699 static void sdhci_enable_sdio_irq_nolock(struct sdhci_host *host, int enable)
1700 {
1701         if (!(host->flags & SDHCI_DEVICE_DEAD)) {
1702                 if (enable)
1703                         host->ier |= SDHCI_INT_CARD_INT;
1704                 else
1705                         host->ier &= ~SDHCI_INT_CARD_INT;
1706 
1707                 sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
1708                 sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
1709                 mmiowb();
1710         }
1711 }
1712 
1713 static void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable)
1714 {
1715         struct sdhci_host *host = mmc_priv(mmc);
1716         unsigned long flags;
1717 
1718         sdhci_runtime_pm_get(host);
1719 
1720         spin_lock_irqsave(&host->lock, flags);
1721         if (enable)
1722                 host->flags |= SDHCI_SDIO_IRQ_ENABLED;
1723         else
1724                 host->flags &= ~SDHCI_SDIO_IRQ_ENABLED;
1725 
1726         sdhci_enable_sdio_irq_nolock(host, enable);
1727         spin_unlock_irqrestore(&host->lock, flags);
1728 
1729         sdhci_runtime_pm_put(host);
1730 }
1731 
1732 static int sdhci_do_start_signal_voltage_switch(struct sdhci_host *host,
1733                                                 struct mmc_ios *ios)
1734 {
1735         struct mmc_host *mmc = host->mmc;
1736         u16 ctrl;
1737         int ret;
1738 
1739         /*
1740          * Signal Voltage Switching is only applicable for Host Controllers
1741          * v3.00 and above.
1742          */
1743         if (host->version < SDHCI_SPEC_300)
1744                 return 0;
1745 
1746         ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1747 
1748         switch (ios->signal_voltage) {
1749         case MMC_SIGNAL_VOLTAGE_330:
1750                 /* Set 1.8V Signal Enable in the Host Control2 register to 0 */
1751                 ctrl &= ~SDHCI_CTRL_VDD_180;
1752                 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1753 
1754                 if (!IS_ERR(mmc->supply.vqmmc)) {
1755                         ret = regulator_set_voltage(mmc->supply.vqmmc, 2700000,
1756                                                     3600000);
1757                         if (ret) {
1758                                 pr_warn("%s: Switching to 3.3V signalling voltage failed\n",
1759                                         mmc_hostname(mmc));
1760                                 return -EIO;
1761                         }
1762                 }
1763                 /* Wait for 5ms */
1764                 usleep_range(5000, 5500);
1765 
1766                 /* 3.3V regulator output should be stable within 5 ms */
1767                 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1768                 if (!(ctrl & SDHCI_CTRL_VDD_180))
1769                         return 0;
1770 
1771                 pr_warn("%s: 3.3V regulator output did not became stable\n",
1772                         mmc_hostname(mmc));
1773 
1774                 return -EAGAIN;
1775         case MMC_SIGNAL_VOLTAGE_180:
1776                 if (!IS_ERR(mmc->supply.vqmmc)) {
1777                         ret = regulator_set_voltage(mmc->supply.vqmmc,
1778                                         1700000, 1950000);
1779                         if (ret) {
1780                                 pr_warn("%s: Switching to 1.8V signalling voltage failed\n",
1781                                         mmc_hostname(mmc));
1782                                 return -EIO;
1783                         }
1784                 }
1785 
1786                 /*
1787                  * Enable 1.8V Signal Enable in the Host Control2
1788                  * register
1789                  */
1790                 ctrl |= SDHCI_CTRL_VDD_180;
1791                 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1792 
1793                 /* 1.8V regulator output should be stable within 5 ms */
1794                 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1795                 if (ctrl & SDHCI_CTRL_VDD_180)
1796                         return 0;
1797 
1798                 pr_warn("%s: 1.8V regulator output did not became stable\n",
1799                         mmc_hostname(mmc));
1800 
1801                 return -EAGAIN;
1802         case MMC_SIGNAL_VOLTAGE_120:
1803                 if (!IS_ERR(mmc->supply.vqmmc)) {
1804                         ret = regulator_set_voltage(mmc->supply.vqmmc, 1100000,
1805                                                     1300000);
1806                         if (ret) {
1807                                 pr_warn("%s: Switching to 1.2V signalling voltage failed\n",
1808                                         mmc_hostname(mmc));
1809                                 return -EIO;
1810                         }
1811                 }
1812                 return 0;
1813         default:
1814                 /* No signal voltage switch required */
1815                 return 0;
1816         }
1817 }
1818 
1819 static int sdhci_start_signal_voltage_switch(struct mmc_host *mmc,
1820         struct mmc_ios *ios)
1821 {
1822         struct sdhci_host *host = mmc_priv(mmc);
1823         int err;
1824 
1825         if (host->version < SDHCI_SPEC_300)
1826                 return 0;
1827         sdhci_runtime_pm_get(host);
1828         err = sdhci_do_start_signal_voltage_switch(host, ios);
1829         sdhci_runtime_pm_put(host);
1830         return err;
1831 }
1832 
1833 static int sdhci_card_busy(struct mmc_host *mmc)
1834 {
1835         struct sdhci_host *host = mmc_priv(mmc);
1836         u32 present_state;
1837 
1838         sdhci_runtime_pm_get(host);
1839         /* Check whether DAT[3:0] is 0000 */
1840         present_state = sdhci_readl(host, SDHCI_PRESENT_STATE);
1841         sdhci_runtime_pm_put(host);
1842 
1843         return !(present_state & SDHCI_DATA_LVL_MASK);
1844 }
1845 
1846 static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
1847 {
1848         struct sdhci_host *host = mmc_priv(mmc);
1849         u16 ctrl;
1850         int tuning_loop_counter = MAX_TUNING_LOOP;
1851         int err = 0;
1852         unsigned long flags;
1853 
1854         sdhci_runtime_pm_get(host);
1855         spin_lock_irqsave(&host->lock, flags);
1856 
1857         /*
1858          * The Host Controller needs tuning only in case of SDR104 mode
1859          * and for SDR50 mode when Use Tuning for SDR50 is set in the
1860          * Capabilities register.
1861          * If the Host Controller supports the HS200 mode then the
1862          * tuning function has to be executed.
1863          */
1864         switch (host->timing) {
1865         case MMC_TIMING_MMC_HS200:
1866         case MMC_TIMING_UHS_SDR104:
1867                 break;
1868 
1869         case MMC_TIMING_UHS_SDR50:
1870                 if (host->flags & SDHCI_SDR50_NEEDS_TUNING ||
1871                     host->flags & SDHCI_SDR104_NEEDS_TUNING)
1872                         break;
1873                 /* FALLTHROUGH */
1874 
1875         default:
1876                 spin_unlock_irqrestore(&host->lock, flags);
1877                 sdhci_runtime_pm_put(host);
1878                 return 0;
1879         }
1880 
1881         if (host->ops->platform_execute_tuning) {
1882                 spin_unlock_irqrestore(&host->lock, flags);
1883                 err = host->ops->platform_execute_tuning(host, opcode);
1884                 sdhci_runtime_pm_put(host);
1885                 return err;
1886         }
1887 
1888         ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1889         ctrl |= SDHCI_CTRL_EXEC_TUNING;
1890         sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1891 
1892         /*
1893          * As per the Host Controller spec v3.00, tuning command
1894          * generates Buffer Read Ready interrupt, so enable that.
1895          *
1896          * Note: The spec clearly says that when tuning sequence
1897          * is being performed, the controller does not generate
1898          * interrupts other than Buffer Read Ready interrupt. But
1899          * to make sure we don't hit a controller bug, we _only_
1900          * enable Buffer Read Ready interrupt here.
1901          */
1902         sdhci_writel(host, SDHCI_INT_DATA_AVAIL, SDHCI_INT_ENABLE);
1903         sdhci_writel(host, SDHCI_INT_DATA_AVAIL, SDHCI_SIGNAL_ENABLE);
1904 
1905         /*
1906          * Issue CMD19 repeatedly till Execute Tuning is set to 0 or the number
1907          * of loops reaches 40 times or a timeout of 150ms occurs.
1908          */
1909         do {
1910                 struct mmc_command cmd = {0};
1911                 struct mmc_request mrq = {NULL};
1912 
1913                 cmd.opcode = opcode;
1914                 cmd.arg = 0;
1915                 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
1916                 cmd.retries = 0;
1917                 cmd.data = NULL;
1918                 cmd.error = 0;
1919 
1920                 if (tuning_loop_counter-- == 0)
1921                         break;
1922 
1923                 mrq.cmd = &cmd;
1924                 host->mrq = &mrq;
1925 
1926                 /*
1927                  * In response to CMD19, the card sends 64 bytes of tuning
1928                  * block to the Host Controller. So we set the block size
1929                  * to 64 here.
1930                  */
1931                 if (cmd.opcode == MMC_SEND_TUNING_BLOCK_HS200) {
1932                         if (mmc->ios.bus_width == MMC_BUS_WIDTH_8)
1933                                 sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, 128),
1934                                              SDHCI_BLOCK_SIZE);
1935                         else if (mmc->ios.bus_width == MMC_BUS_WIDTH_4)
1936                                 sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, 64),
1937                                              SDHCI_BLOCK_SIZE);
1938                 } else {
1939                         sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, 64),
1940                                      SDHCI_BLOCK_SIZE);
1941                 }
1942 
1943                 /*
1944                  * The tuning block is sent by the card to the host controller.
1945                  * So we set the TRNS_READ bit in the Transfer Mode register.
1946                  * This also takes care of setting DMA Enable and Multi Block
1947                  * Select in the same register to 0.
1948                  */
1949                 sdhci_writew(host, SDHCI_TRNS_READ, SDHCI_TRANSFER_MODE);
1950 
1951                 sdhci_send_command(host, &cmd);
1952 
1953                 host->cmd = NULL;
1954                 host->mrq = NULL;
1955 
1956                 spin_unlock_irqrestore(&host->lock, flags);
1957                 /* Wait for Buffer Read Ready interrupt */
1958                 wait_event_interruptible_timeout(host->buf_ready_int,
1959                                         (host->tuning_done == 1),
1960                                         msecs_to_jiffies(50));
1961                 spin_lock_irqsave(&host->lock, flags);
1962 
1963                 if (!host->tuning_done) {
1964                         pr_info(DRIVER_NAME ": Timeout waiting for "
1965                                 "Buffer Read Ready interrupt during tuning "
1966                                 "procedure, falling back to fixed sampling "
1967                                 "clock\n");
1968                         ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1969                         ctrl &= ~SDHCI_CTRL_TUNED_CLK;
1970                         ctrl &= ~SDHCI_CTRL_EXEC_TUNING;
1971                         sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1972 
1973                         err = -EIO;
1974                         goto out;
1975                 }
1976 
1977                 host->tuning_done = 0;
1978 
1979                 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
1980 
1981                 /* eMMC spec does not require a delay between tuning cycles */
1982                 if (opcode == MMC_SEND_TUNING_BLOCK)
1983                         mdelay(1);
1984         } while (ctrl & SDHCI_CTRL_EXEC_TUNING);
1985 
1986         /*
1987          * The Host Driver has exhausted the maximum number of loops allowed,
1988          * so use fixed sampling frequency.
1989          */
1990         if (tuning_loop_counter < 0) {
1991                 ctrl &= ~SDHCI_CTRL_TUNED_CLK;
1992                 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
1993         }
1994         if (!(ctrl & SDHCI_CTRL_TUNED_CLK)) {
1995                 pr_info(DRIVER_NAME ": Tuning procedure"
1996                         " failed, falling back to fixed sampling"
1997                         " clock\n");
1998                 err = -EIO;
1999         }
2000 
2001 out:
2002         /*
2003          * If this is the very first time we are here, we start the retuning
2004          * timer. Since only during the first time, SDHCI_NEEDS_RETUNING
2005          * flag won't be set, we check this condition before actually starting
2006          * the timer.
2007          */
2008         if (!(host->flags & SDHCI_NEEDS_RETUNING) && host->tuning_count &&
2009             (host->tuning_mode == SDHCI_TUNING_MODE_1)) {
2010                 host->flags |= SDHCI_USING_RETUNING_TIMER;
2011                 mod_timer(&host->tuning_timer, jiffies +
2012                         host->tuning_count * HZ);
2013                 /* Tuning mode 1 limits the maximum data length to 4MB */
2014                 mmc->max_blk_count = (4 * 1024 * 1024) / mmc->max_blk_size;
2015         } else if (host->flags & SDHCI_USING_RETUNING_TIMER) {
2016                 host->flags &= ~SDHCI_NEEDS_RETUNING;
2017                 /* Reload the new initial value for timer */
2018                 mod_timer(&host->tuning_timer, jiffies +
2019                           host->tuning_count * HZ);
2020         }
2021 
2022         /*
2023          * In case tuning fails, host controllers which support re-tuning can
2024          * try tuning again at a later time, when the re-tuning timer expires.
2025          * So for these controllers, we return 0. Since there might be other
2026          * controllers who do not have this capability, we return error for
2027          * them. SDHCI_USING_RETUNING_TIMER means the host is currently using
2028          * a retuning timer to do the retuning for the card.
2029          */
2030         if (err && (host->flags & SDHCI_USING_RETUNING_TIMER))
2031                 err = 0;
2032 
2033         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
2034         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
2035         spin_unlock_irqrestore(&host->lock, flags);
2036         sdhci_runtime_pm_put(host);
2037 
2038         return err;
2039 }
2040 
2041 
2042 static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable)
2043 {
2044         /* Host Controller v3.00 defines preset value registers */
2045         if (host->version < SDHCI_SPEC_300)
2046                 return;
2047 
2048         /*
2049          * We only enable or disable Preset Value if they are not already
2050          * enabled or disabled respectively. Otherwise, we bail out.
2051          */
2052         if (host->preset_enabled != enable) {
2053                 u16 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
2054 
2055                 if (enable)
2056                         ctrl |= SDHCI_CTRL_PRESET_VAL_ENABLE;
2057                 else
2058                         ctrl &= ~SDHCI_CTRL_PRESET_VAL_ENABLE;
2059 
2060                 sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
2061 
2062                 if (enable)
2063                         host->flags |= SDHCI_PV_ENABLED;
2064                 else
2065                         host->flags &= ~SDHCI_PV_ENABLED;
2066 
2067                 host->preset_enabled = enable;
2068         }
2069 }
2070 
2071 static void sdhci_card_event(struct mmc_host *mmc)
2072 {
2073         struct sdhci_host *host = mmc_priv(mmc);
2074         unsigned long flags;
2075 
2076         /* First check if client has provided their own card event */
2077         if (host->ops->card_event)
2078                 host->ops->card_event(host);
2079 
2080         spin_lock_irqsave(&host->lock, flags);
2081 
2082         /* Check host->mrq first in case we are runtime suspended */
2083         if (host->mrq && !sdhci_do_get_cd(host)) {
2084                 pr_err("%s: Card removed during transfer!\n",
2085                         mmc_hostname(host->mmc));
2086                 pr_err("%s: Resetting controller.\n",
2087                         mmc_hostname(host->mmc));
2088 
2089                 sdhci_do_reset(host, SDHCI_RESET_CMD);
2090                 sdhci_do_reset(host, SDHCI_RESET_DATA);
2091 
2092                 host->mrq->cmd->error = -ENOMEDIUM;
2093                 tasklet_schedule(&host->finish_tasklet);
2094         }
2095 
2096         spin_unlock_irqrestore(&host->lock, flags);
2097 }
2098 
2099 static const struct mmc_host_ops sdhci_ops = {
2100         .request        = sdhci_request,
2101         .set_ios        = sdhci_set_ios,
2102         .get_cd         = sdhci_get_cd,
2103         .get_ro         = sdhci_get_ro,
2104         .hw_reset       = sdhci_hw_reset,
2105         .enable_sdio_irq = sdhci_enable_sdio_irq,
2106         .start_signal_voltage_switch    = sdhci_start_signal_voltage_switch,
2107         .execute_tuning                 = sdhci_execute_tuning,
2108         .card_event                     = sdhci_card_event,
2109         .card_busy      = sdhci_card_busy,
2110 };
2111 
2112 /*****************************************************************************\
2113  *                                                                           *
2114  * Tasklets                                                                  *
2115  *                                                                           *
2116 \*****************************************************************************/
2117 
2118 static void sdhci_tasklet_finish(unsigned long param)
2119 {
2120         struct sdhci_host *host;
2121         unsigned long flags;
2122         struct mmc_request *mrq;
2123 
2124         host = (struct sdhci_host*)param;
2125 
2126         spin_lock_irqsave(&host->lock, flags);
2127 
2128         /*
2129          * If this tasklet gets rescheduled while running, it will
2130          * be run again afterwards but without any active request.
2131          */
2132         if (!host->mrq) {
2133                 spin_unlock_irqrestore(&host->lock, flags);
2134                 return;
2135         }
2136 
2137         del_timer(&host->timer);
2138 
2139         mrq = host->mrq;
2140 
2141         /*
2142          * The controller needs a reset of internal state machines
2143          * upon error conditions.
2144          */
2145         if (!(host->flags & SDHCI_DEVICE_DEAD) &&
2146             ((mrq->cmd && mrq->cmd->error) ||
2147                  (mrq->data && (mrq->data->error ||
2148                   (mrq->data->stop && mrq->data->stop->error))) ||
2149                    (host->quirks & SDHCI_QUIRK_RESET_AFTER_REQUEST))) {
2150 
2151                 /* Some controllers need this kick or reset won't work here */
2152                 if (host->quirks & SDHCI_QUIRK_CLOCK_BEFORE_RESET)
2153                         /* This is to force an update */
2154                         host->ops->set_clock(host, host->clock);
2155 
2156                 /* Spec says we should do both at the same time, but Ricoh
2157                    controllers do not like that. */
2158                 sdhci_do_reset(host, SDHCI_RESET_CMD);
2159                 sdhci_do_reset(host, SDHCI_RESET_DATA);
2160         }
2161 
2162         host->mrq = NULL;
2163         host->cmd = NULL;
2164         host->data = NULL;
2165 
2166 #ifndef SDHCI_USE_LEDS_CLASS
2167         sdhci_deactivate_led(host);
2168 #endif
2169 
2170         mmiowb();
2171         spin_unlock_irqrestore(&host->lock, flags);
2172 
2173         mmc_request_done(host->mmc, mrq);
2174         sdhci_runtime_pm_put(host);
2175 }
2176 
2177 static void sdhci_timeout_timer(unsigned long data)
2178 {
2179         struct sdhci_host *host;
2180         unsigned long flags;
2181 
2182         host = (struct sdhci_host*)data;
2183 
2184         spin_lock_irqsave(&host->lock, flags);
2185 
2186         if (host->mrq) {
2187                 pr_err("%s: Timeout waiting for hardware "
2188                         "interrupt.\n", mmc_hostname(host->mmc));
2189                 sdhci_dumpregs(host);
2190 
2191                 if (host->data) {
2192                         host->data->error = -ETIMEDOUT;
2193                         sdhci_finish_data(host);
2194                 } else {
2195                         if (host->cmd)
2196                                 host->cmd->error = -ETIMEDOUT;
2197                         else
2198                                 host->mrq->cmd->error = -ETIMEDOUT;
2199 
2200                         tasklet_schedule(&host->finish_tasklet);
2201                 }
2202         }
2203 
2204         mmiowb();
2205         spin_unlock_irqrestore(&host->lock, flags);
2206 }
2207 
2208 static void sdhci_tuning_timer(unsigned long data)
2209 {
2210         struct sdhci_host *host;
2211         unsigned long flags;
2212 
2213         host = (struct sdhci_host *)data;
2214 
2215         spin_lock_irqsave(&host->lock, flags);
2216 
2217         host->flags |= SDHCI_NEEDS_RETUNING;
2218 
2219         spin_unlock_irqrestore(&host->lock, flags);
2220 }
2221 
2222 /*****************************************************************************\
2223  *                                                                           *
2224  * Interrupt handling                                                        *
2225  *                                                                           *
2226 \*****************************************************************************/
2227 
2228 static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask, u32 *mask)
2229 {
2230         BUG_ON(intmask == 0);
2231 
2232         if (!host->cmd) {
2233                 pr_err("%s: Got command interrupt 0x%08x even "
2234                         "though no command operation was in progress.\n",
2235                         mmc_hostname(host->mmc), (unsigned)intmask);
2236                 sdhci_dumpregs(host);
2237                 return;
2238         }
2239 
2240         if (intmask & SDHCI_INT_TIMEOUT)
2241                 host->cmd->error = -ETIMEDOUT;
2242         else if (intmask & (SDHCI_INT_CRC | SDHCI_INT_END_BIT |
2243                         SDHCI_INT_INDEX))
2244                 host->cmd->error = -EILSEQ;
2245 
2246         if (host->cmd->error) {
2247                 tasklet_schedule(&host->finish_tasklet);
2248                 return;
2249         }
2250 
2251         /*
2252          * The host can send and interrupt when the busy state has
2253          * ended, allowing us to wait without wasting CPU cycles.
2254          * Unfortunately this is overloaded on the "data complete"
2255          * interrupt, so we need to take some care when handling
2256          * it.
2257          *
2258          * Note: The 1.0 specification is a bit ambiguous about this
2259          *       feature so there might be some problems with older
2260          *       controllers.
2261          */
2262         if (host->cmd->flags & MMC_RSP_BUSY) {
2263                 if (host->cmd->data)
2264                         DBG("Cannot wait for busy signal when also "
2265                                 "doing a data transfer");
2266                 else if (!(host->quirks & SDHCI_QUIRK_NO_BUSY_IRQ)
2267                                 && !host->busy_handle) {
2268                         /* Mark that command complete before busy is ended */
2269                         host->busy_handle = 1;
2270                         return;
2271                 }
2272 
2273                 /* The controller does not support the end-of-busy IRQ,
2274                  * fall through and take the SDHCI_INT_RESPONSE */
2275         } else if ((host->quirks2 & SDHCI_QUIRK2_STOP_WITH_TC) &&
2276                    host->cmd->opcode == MMC_STOP_TRANSMISSION && !host->data) {
2277                 *mask &= ~SDHCI_INT_DATA_END;
2278         }
2279 
2280         if (intmask & SDHCI_INT_RESPONSE)
2281                 sdhci_finish_command(host);
2282 }
2283 
2284 #ifdef CONFIG_MMC_DEBUG
2285 static void sdhci_show_adma_error(struct sdhci_host *host)
2286 {
2287         const char *name = mmc_hostname(host->mmc);
2288         u8 *desc = host->adma_desc;
2289         __le32 *dma;
2290         __le16 *len;
2291         u8 attr;
2292 
2293         sdhci_dumpregs(host);
2294 
2295         while (true) {
2296                 dma = (__le32 *)(desc + 4);
2297                 len = (__le16 *)(desc + 2);
2298                 attr = *desc;
2299 
2300                 DBG("%s: %p: DMA 0x%08x, LEN 0x%04x, Attr=0x%02x\n",
2301                     name, desc, le32_to_cpu(*dma), le16_to_cpu(*len), attr);
2302 
2303                 desc += 8;
2304 
2305                 if (attr & 2)
2306                         break;
2307         }
2308 }
2309 #else
2310 static void sdhci_show_adma_error(struct sdhci_host *host) { }
2311 #endif
2312 
2313 static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
2314 {
2315         u32 command;
2316         BUG_ON(intmask == 0);
2317 
2318         /* CMD19 generates _only_ Buffer Read Ready interrupt */
2319         if (intmask & SDHCI_INT_DATA_AVAIL) {
2320                 command = SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND));
2321                 if (command == MMC_SEND_TUNING_BLOCK ||
2322                     command == MMC_SEND_TUNING_BLOCK_HS200) {
2323                         host->tuning_done = 1;
2324                         wake_up(&host->buf_ready_int);
2325                         return;
2326                 }
2327         }
2328 
2329         if (!host->data) {
2330                 /*
2331                  * The "data complete" interrupt is also used to
2332                  * indicate that a busy state has ended. See comment
2333                  * above in sdhci_cmd_irq().
2334                  */
2335                 if (host->cmd && (host->cmd->flags & MMC_RSP_BUSY)) {
2336                         if (intmask & SDHCI_INT_DATA_TIMEOUT) {
2337                                 host->cmd->error = -ETIMEDOUT;
2338                                 tasklet_schedule(&host->finish_tasklet);
2339                                 return;
2340                         }
2341                         if (intmask & SDHCI_INT_DATA_END) {
2342                                 /*
2343                                  * Some cards handle busy-end interrupt
2344                                  * before the command completed, so make
2345                                  * sure we do things in the proper order.
2346                                  */
2347                                 if (host->busy_handle)
2348                                         sdhci_finish_command(host);
2349                                 else
2350                                         host->busy_handle = 1;
2351                                 return;
2352                         }
2353                 }
2354 
2355                 pr_err("%s: Got data interrupt 0x%08x even "
2356                         "though no data operation was in progress.\n",
2357                         mmc_hostname(host->mmc), (unsigned)intmask);
2358                 sdhci_dumpregs(host);
2359 
2360                 return;
2361         }
2362 
2363         if (intmask & SDHCI_INT_DATA_TIMEOUT)
2364                 host->data->error = -ETIMEDOUT;
2365         else if (intmask & SDHCI_INT_DATA_END_BIT)
2366                 host->data->error = -EILSEQ;
2367         else if ((intmask & SDHCI_INT_DATA_CRC) &&
2368                 SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND))
2369                         != MMC_BUS_TEST_R)
2370                 host->data->error = -EILSEQ;
2371         else if (intmask & SDHCI_INT_ADMA_ERROR) {
2372                 pr_err("%s: ADMA error\n", mmc_hostname(host->mmc));
2373                 sdhci_show_adma_error(host);
2374                 host->data->error = -EIO;
2375                 if (host->ops->adma_workaround)
2376                         host->ops->adma_workaround(host, intmask);
2377         }
2378 
2379         if (host->data->error)
2380                 sdhci_finish_data(host);
2381         else {
2382                 if (intmask & (SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL))
2383                         sdhci_transfer_pio(host);
2384 
2385                 /*
2386                  * We currently don't do anything fancy with DMA
2387                  * boundaries, but as we can't disable the feature
2388                  * we need to at least restart the transfer.
2389                  *
2390                  * According to the spec sdhci_readl(host, SDHCI_DMA_ADDRESS)
2391                  * should return a valid address to continue from, but as
2392                  * some controllers are faulty, don't trust them.
2393                  */
2394                 if (intmask & SDHCI_INT_DMA_END) {
2395                         u32 dmastart, dmanow;
2396                         dmastart = sg_dma_address(host->data->sg);
2397                         dmanow = dmastart + host->data->bytes_xfered;
2398                         /*
2399                          * Force update to the next DMA block boundary.
2400                          */
2401                         dmanow = (dmanow &
2402                                 ~(SDHCI_DEFAULT_BOUNDARY_SIZE - 1)) +
2403                                 SDHCI_DEFAULT_BOUNDARY_SIZE;
2404                         host->data->bytes_xfered = dmanow - dmastart;
2405                         DBG("%s: DMA base 0x%08x, transferred 0x%06x bytes,"
2406                                 " next 0x%08x\n",
2407                                 mmc_hostname(host->mmc), dmastart,
2408                                 host->data->bytes_xfered, dmanow);
2409                         sdhci_writel(host, dmanow, SDHCI_DMA_ADDRESS);
2410                 }
2411 
2412                 if (intmask & SDHCI_INT_DATA_END) {
2413                         if (host->cmd) {
2414                                 /*
2415                                  * Data managed to finish before the
2416                                  * command completed. Make sure we do
2417                                  * things in the proper order.
2418                                  */
2419                                 host->data_early = 1;
2420                         } else {
2421                                 sdhci_finish_data(host);
2422                         }
2423                 }
2424         }
2425 }
2426 
2427 static irqreturn_t sdhci_irq(int irq, void *dev_id)
2428 {
2429         irqreturn_t result = IRQ_NONE;
2430         struct sdhci_host *host = dev_id;
2431         u32 intmask, mask, unexpected = 0;
2432         int max_loops = 16;
2433 
2434         spin_lock(&host->lock);
2435 
2436         if (host->runtime_suspended && !sdhci_sdio_irq_enabled(host)) {
2437                 spin_unlock(&host->lock);
2438                 return IRQ_NONE;
2439         }
2440 
2441         intmask = sdhci_readl(host, SDHCI_INT_STATUS);
2442         if (!intmask || intmask == 0xffffffff) {
2443                 result = IRQ_NONE;
2444                 goto out;
2445         }
2446 
2447         do {
2448                 /* Clear selected interrupts. */
2449                 mask = intmask & (SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK |
2450                                   SDHCI_INT_BUS_POWER);
2451                 sdhci_writel(host, mask, SDHCI_INT_STATUS);
2452 
2453                 DBG("*** %s got interrupt: 0x%08x\n",
2454                         mmc_hostname(host->mmc), intmask);
2455 
2456                 if (intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
2457                         u32 present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
2458                                       SDHCI_CARD_PRESENT;
2459 
2460                         /*
2461                          * There is a observation on i.mx esdhc.  INSERT
2462                          * bit will be immediately set again when it gets
2463                          * cleared, if a card is inserted.  We have to mask
2464                          * the irq to prevent interrupt storm which will
2465                          * freeze the system.  And the REMOVE gets the
2466                          * same situation.
2467                          *
2468                          * More testing are needed here to ensure it works
2469                          * for other platforms though.
2470                          */
2471                         host->ier &= ~(SDHCI_INT_CARD_INSERT |
2472                                        SDHCI_INT_CARD_REMOVE);
2473                         host->ier |= present ? SDHCI_INT_CARD_REMOVE :
2474                                                SDHCI_INT_CARD_INSERT;
2475                         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
2476                         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
2477 
2478                         sdhci_writel(host, intmask & (SDHCI_INT_CARD_INSERT |
2479                                      SDHCI_INT_CARD_REMOVE), SDHCI_INT_STATUS);
2480 
2481                         host->thread_isr |= intmask & (SDHCI_INT_CARD_INSERT |
2482                                                        SDHCI_INT_CARD_REMOVE);
2483                         result = IRQ_WAKE_THREAD;
2484                 }
2485 
2486                 if (intmask & SDHCI_INT_CMD_MASK)
2487                         sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK,
2488                                       &intmask);
2489 
2490                 if (intmask & SDHCI_INT_DATA_MASK)
2491                         sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK);
2492 
2493                 if (intmask & SDHCI_INT_BUS_POWER)
2494                         pr_err("%s: Card is consuming too much power!\n",
2495                                 mmc_hostname(host->mmc));
2496 
2497                 if (intmask & SDHCI_INT_CARD_INT) {
2498                         sdhci_enable_sdio_irq_nolock(host, false);
2499                         host->thread_isr |= SDHCI_INT_CARD_INT;
2500                         result = IRQ_WAKE_THREAD;
2501                 }
2502 
2503                 intmask &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE |
2504                              SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK |
2505                              SDHCI_INT_ERROR | SDHCI_INT_BUS_POWER |
2506                              SDHCI_INT_CARD_INT);
2507 
2508                 if (intmask) {
2509                         unexpected |= intmask;
2510                         sdhci_writel(host, intmask, SDHCI_INT_STATUS);
2511                 }
2512 
2513                 if (result == IRQ_NONE)
2514                         result = IRQ_HANDLED;
2515 
2516                 intmask = sdhci_readl(host, SDHCI_INT_STATUS);
2517         } while (intmask && --max_loops);
2518 out:
2519         spin_unlock(&host->lock);
2520 
2521         if (unexpected) {
2522                 pr_err("%s: Unexpected interrupt 0x%08x.\n",
2523                            mmc_hostname(host->mmc), unexpected);
2524                 sdhci_dumpregs(host);
2525         }
2526 
2527         return result;
2528 }
2529 
2530 static irqreturn_t sdhci_thread_irq(int irq, void *dev_id)
2531 {
2532         struct sdhci_host *host = dev_id;
2533         unsigned long flags;
2534         u32 isr;
2535 
2536         spin_lock_irqsave(&host->lock, flags);
2537         isr = host->thread_isr;
2538         host->thread_isr = 0;
2539         spin_unlock_irqrestore(&host->lock, flags);
2540 
2541         if (isr & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
2542                 sdhci_card_event(host->mmc);
2543                 mmc_detect_change(host->mmc, msecs_to_jiffies(200));
2544         }
2545 
2546         if (isr & SDHCI_INT_CARD_INT) {
2547                 sdio_run_irqs(host->mmc);
2548 
2549                 spin_lock_irqsave(&host->lock, flags);
2550                 if (host->flags & SDHCI_SDIO_IRQ_ENABLED)
2551                         sdhci_enable_sdio_irq_nolock(host, true);
2552                 spin_unlock_irqrestore(&host->lock, flags);
2553         }
2554 
2555         return isr ? IRQ_HANDLED : IRQ_NONE;
2556 }
2557 
2558 /*****************************************************************************\
2559  *                                                                           *
2560  * Suspend/resume                                                            *
2561  *                                                                           *
2562 \*****************************************************************************/
2563 
2564 #ifdef CONFIG_PM
2565 void sdhci_enable_irq_wakeups(struct sdhci_host *host)
2566 {
2567         u8 val;
2568         u8 mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE
2569                         | SDHCI_WAKE_ON_INT;
2570 
2571         val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
2572         val |= mask ;
2573         /* Avoid fake wake up */
2574         if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
2575                 val &= ~(SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE);
2576         sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
2577 }
2578 EXPORT_SYMBOL_GPL(sdhci_enable_irq_wakeups);
2579 
2580 static void sdhci_disable_irq_wakeups(struct sdhci_host *host)
2581 {
2582         u8 val;
2583         u8 mask = SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE
2584                         | SDHCI_WAKE_ON_INT;
2585 
2586         val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
2587         val &= ~mask;
2588         sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
2589 }
2590 
2591 int sdhci_suspend_host(struct sdhci_host *host)
2592 {
2593         sdhci_disable_card_detection(host);
2594 
2595         /* Disable tuning since we are suspending */
2596         if (host->flags & SDHCI_USING_RETUNING_TIMER) {
2597                 del_timer_sync(&host->tuning_timer);
2598                 host->flags &= ~SDHCI_NEEDS_RETUNING;
2599         }
2600 
2601         if (!device_may_wakeup(mmc_dev(host->mmc))) {
2602                 host->ier = 0;
2603                 sdhci_writel(host, 0, SDHCI_INT_ENABLE);
2604                 sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
2605                 free_irq(host->irq, host);
2606         } else {
2607                 sdhci_enable_irq_wakeups(host);
2608                 enable_irq_wake(host->irq);
2609         }
2610         return 0;
2611 }
2612 
2613 EXPORT_SYMBOL_GPL(sdhci_suspend_host);
2614 
2615 int sdhci_resume_host(struct sdhci_host *host)
2616 {
2617         int ret = 0;
2618 
2619         if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
2620                 if (host->ops->enable_dma)
2621                         host->ops->enable_dma(host);
2622         }
2623 
2624         if (!device_may_wakeup(mmc_dev(host->mmc))) {
2625                 ret = request_threaded_irq(host->irq, sdhci_irq,
2626                                            sdhci_thread_irq, IRQF_SHARED,
2627                                            mmc_hostname(host->mmc), host);
2628                 if (ret)
2629                         return ret;
2630         } else {
2631                 sdhci_disable_irq_wakeups(host);
2632                 disable_irq_wake(host->irq);
2633         }
2634 
2635         if ((host->mmc->pm_flags & MMC_PM_KEEP_POWER) &&
2636             (host->quirks2 & SDHCI_QUIRK2_HOST_OFF_CARD_ON)) {
2637                 /* Card keeps power but host controller does not */
2638                 sdhci_init(host, 0);
2639                 host->pwr = 0;
2640                 host->clock = 0;
2641                 sdhci_do_set_ios(host, &host->mmc->ios);
2642         } else {
2643                 sdhci_init(host, (host->mmc->pm_flags & MMC_PM_KEEP_POWER));
2644                 mmiowb();
2645         }
2646 
2647         sdhci_enable_card_detection(host);
2648 
2649         /* Set the re-tuning expiration flag */
2650         if (host->flags & SDHCI_USING_RETUNING_TIMER)
2651                 host->flags |= SDHCI_NEEDS_RETUNING;
2652 
2653         return ret;
2654 }
2655 
2656 EXPORT_SYMBOL_GPL(sdhci_resume_host);
2657 #endif /* CONFIG_PM */
2658 
2659 #ifdef CONFIG_PM_RUNTIME
2660 
2661 static int sdhci_runtime_pm_get(struct sdhci_host *host)
2662 {
2663         return pm_runtime_get_sync(host->mmc->parent);
2664 }
2665 
2666 static int sdhci_runtime_pm_put(struct sdhci_host *host)
2667 {
2668         pm_runtime_mark_last_busy(host->mmc->parent);
2669         return pm_runtime_put_autosuspend(host->mmc->parent);
2670 }
2671 
2672 static void sdhci_runtime_pm_bus_on(struct sdhci_host *host)
2673 {
2674         if (host->runtime_suspended || host->bus_on)
2675                 return;
2676         host->bus_on = true;
2677         pm_runtime_get_noresume(host->mmc->parent);
2678 }
2679 
2680 static void sdhci_runtime_pm_bus_off(struct sdhci_host *host)
2681 {
2682         if (host->runtime_suspended || !host->bus_on)
2683                 return;
2684         host->bus_on = false;
2685         pm_runtime_put_noidle(host->mmc->parent);
2686 }
2687 
2688 int sdhci_runtime_suspend_host(struct sdhci_host *host)
2689 {
2690         unsigned long flags;
2691 
2692         /* Disable tuning since we are suspending */
2693         if (host->flags & SDHCI_USING_RETUNING_TIMER) {
2694                 del_timer_sync(&host->tuning_timer);
2695                 host->flags &= ~SDHCI_NEEDS_RETUNING;
2696         }
2697 
2698         spin_lock_irqsave(&host->lock, flags);
2699         host->ier &= SDHCI_INT_CARD_INT;
2700         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
2701         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
2702         spin_unlock_irqrestore(&host->lock, flags);
2703 
2704         synchronize_hardirq(host->irq);
2705 
2706         spin_lock_irqsave(&host->lock, flags);
2707         host->runtime_suspended = true;
2708         spin_unlock_irqrestore(&host->lock, flags);
2709 
2710         return 0;
2711 }
2712 EXPORT_SYMBOL_GPL(sdhci_runtime_suspend_host);
2713 
2714 int sdhci_runtime_resume_host(struct sdhci_host *host)
2715 {
2716         unsigned long flags;
2717         int host_flags = host->flags;
2718 
2719         if (host_flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
2720                 if (host->ops->enable_dma)
2721                         host->ops->enable_dma(host);
2722         }
2723 
2724         sdhci_init(host, 0);
2725 
2726         /* Force clock and power re-program */
2727         host->pwr = 0;
2728         host->clock = 0;
2729         sdhci_do_set_ios(host, &host->mmc->ios);
2730 
2731         sdhci_do_start_signal_voltage_switch(host, &host->mmc->ios);
2732         if ((host_flags & SDHCI_PV_ENABLED) &&
2733                 !(host->quirks2 & SDHCI_QUIRK2_PRESET_VALUE_BROKEN)) {
2734                 spin_lock_irqsave(&host->lock, flags);
2735                 sdhci_enable_preset_value(host, true);
2736                 spin_unlock_irqrestore(&host->lock, flags);
2737         }
2738 
2739         /* Set the re-tuning expiration flag */
2740         if (host->flags & SDHCI_USING_RETUNING_TIMER)
2741                 host->flags |= SDHCI_NEEDS_RETUNING;
2742 
2743         spin_lock_irqsave(&host->lock, flags);
2744 
2745         host->runtime_suspended = false;
2746 
2747         /* Enable SDIO IRQ */
2748         if (host->flags & SDHCI_SDIO_IRQ_ENABLED)
2749                 sdhci_enable_sdio_irq_nolock(host, true);
2750 
2751         /* Enable Card Detection */
2752         sdhci_enable_card_detection(host);
2753 
2754         spin_unlock_irqrestore(&host->lock, flags);
2755 
2756         return 0;
2757 }
2758 EXPORT_SYMBOL_GPL(sdhci_runtime_resume_host);
2759 
2760 #endif
2761 
2762 /*****************************************************************************\
2763  *                                                                           *
2764  * Device allocation/registration                                            *
2765  *                                                                           *
2766 \*****************************************************************************/
2767 
2768 struct sdhci_host *sdhci_alloc_host(struct device *dev,
2769         size_t priv_size)
2770 {
2771         struct mmc_host *mmc;
2772         struct sdhci_host *host;
2773 
2774         WARN_ON(dev == NULL);
2775 
2776         mmc = mmc_alloc_host(sizeof(struct sdhci_host) + priv_size, dev);
2777         if (!mmc)
2778                 return ERR_PTR(-ENOMEM);
2779 
2780         host = mmc_priv(mmc);
2781         host->mmc = mmc;
2782 
2783         return host;
2784 }
2785 
2786 EXPORT_SYMBOL_GPL(sdhci_alloc_host);
2787 
2788 int sdhci_add_host(struct sdhci_host *host)
2789 {
2790         struct mmc_host *mmc;
2791         u32 caps[2] = {0, 0};
2792         u32 max_current_caps;
2793         unsigned int ocr_avail;
2794         unsigned int override_timeout_clk;
2795         int ret;
2796 
2797         WARN_ON(host == NULL);
2798         if (host == NULL)
2799                 return -EINVAL;
2800 
2801         mmc = host->mmc;
2802 
2803         if (debug_quirks)
2804                 host->quirks = debug_quirks;
2805         if (debug_quirks2)
2806                 host->quirks2 = debug_quirks2;
2807 
2808         override_timeout_clk = host->timeout_clk;
2809 
2810         sdhci_do_reset(host, SDHCI_RESET_ALL);
2811 
2812         host->version = sdhci_readw(host, SDHCI_HOST_VERSION);
2813         host->version = (host->version & SDHCI_SPEC_VER_MASK)
2814                                 >> SDHCI_SPEC_VER_SHIFT;
2815         if (host->version > SDHCI_SPEC_300) {
2816                 pr_err("%s: Unknown controller version (%d). "
2817                         "You may experience problems.\n", mmc_hostname(mmc),
2818                         host->version);
2819         }
2820 
2821         caps[0] = (host->quirks & SDHCI_QUIRK_MISSING_CAPS) ? host->caps :
2822                 sdhci_readl(host, SDHCI_CAPABILITIES);
2823 
2824         if (host->version >= SDHCI_SPEC_300)
2825                 caps[1] = (host->quirks & SDHCI_QUIRK_MISSING_CAPS) ?
2826                         host->caps1 :
2827                         sdhci_readl(host, SDHCI_CAPABILITIES_1);
2828 
2829         if (host->quirks & SDHCI_QUIRK_FORCE_DMA)
2830                 host->flags |= SDHCI_USE_SDMA;
2831         else if (!(caps[0] & SDHCI_CAN_DO_SDMA))
2832                 DBG("Controller doesn't have SDMA capability\n");
2833         else
2834                 host->flags |= SDHCI_USE_SDMA;
2835 
2836         if ((host->quirks & SDHCI_QUIRK_BROKEN_DMA) &&
2837                 (host->flags & SDHCI_USE_SDMA)) {
2838                 DBG("Disabling DMA as it is marked broken\n");
2839                 host->flags &= ~SDHCI_USE_SDMA;
2840         }
2841 
2842         if ((host->version >= SDHCI_SPEC_200) &&
2843                 (caps[0] & SDHCI_CAN_DO_ADMA2))
2844                 host->flags |= SDHCI_USE_ADMA;
2845 
2846         if ((host->quirks & SDHCI_QUIRK_BROKEN_ADMA) &&
2847                 (host->flags & SDHCI_USE_ADMA)) {
2848                 DBG("Disabling ADMA as it is marked broken\n");
2849                 host->flags &= ~SDHCI_USE_ADMA;
2850         }
2851 
2852         if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
2853                 if (host->ops->enable_dma) {
2854                         if (host->ops->enable_dma(host)) {
2855                                 pr_warn("%s: No suitable DMA available - falling back to PIO\n",
2856                                         mmc_hostname(mmc));
2857                                 host->flags &=
2858                                         ~(SDHCI_USE_SDMA | SDHCI_USE_ADMA);
2859                         }
2860                 }
2861         }
2862 
2863         if (host->flags & SDHCI_USE_ADMA) {
2864                 /*
2865                  * We need to allocate descriptors for all sg entries
2866                  * (128) and potentially one alignment transfer for
2867                  * each of those entries.
2868                  */
2869                 host->adma_desc = dma_alloc_coherent(mmc_dev(mmc),
2870                                                      ADMA_SIZE, &host->adma_addr,
2871                                                      GFP_KERNEL);
2872                 host->align_buffer = kmalloc(128 * 4, GFP_KERNEL);
2873                 if (!host->adma_desc || !host->align_buffer) {
2874                         dma_free_coherent(mmc_dev(mmc), ADMA_SIZE,
2875                                           host->adma_desc, host->adma_addr);
2876                         kfree(host->align_buffer);
2877                         pr_warn("%s: Unable to allocate ADMA buffers - falling back to standard DMA\n",
2878                                 mmc_hostname(mmc));
2879                         host->flags &= ~SDHCI_USE_ADMA;
2880                         host->adma_desc = NULL;
2881                         host->align_buffer = NULL;
2882                 } else if (host->adma_addr & 3) {
2883                         pr_warn("%s: unable to allocate aligned ADMA descriptor\n",
2884                                 mmc_hostname(mmc));
2885                         host->flags &= ~SDHCI_USE_ADMA;
2886                         dma_free_coherent(mmc_dev(mmc), ADMA_SIZE,
2887                                           host->adma_desc, host->adma_addr);
2888                         kfree(host->align_buffer);
2889                         host->adma_desc = NULL;
2890                         host->align_buffer = NULL;
2891                 }
2892         }
2893 
2894         /*
2895          * If we use DMA, then it's up to the caller to set the DMA
2896          * mask, but PIO does not need the hw shim so we set a new
2897          * mask here in that case.
2898          */
2899         if (!(host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA))) {
2900                 host->dma_mask = DMA_BIT_MASK(64);
2901                 mmc_dev(mmc)->dma_mask = &host->dma_mask;
2902         }
2903 
2904         if (host->version >= SDHCI_SPEC_300)
2905                 host->max_clk = (caps[0] & SDHCI_CLOCK_V3_BASE_MASK)
2906                         >> SDHCI_CLOCK_BASE_SHIFT;
2907         else
2908                 host->max_clk = (caps[0] & SDHCI_CLOCK_BASE_MASK)
2909                         >> SDHCI_CLOCK_BASE_SHIFT;
2910 
2911         host->max_clk *= 1000000;
2912         if (host->max_clk == 0 || host->quirks &
2913                         SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN) {
2914                 if (!host->ops->get_max_clock) {
2915                         pr_err("%s: Hardware doesn't specify base clock "
2916                                "frequency.\n", mmc_hostname(mmc));
2917                         return -ENODEV;
2918                 }
2919                 host->max_clk = host->ops->get_max_clock(host);
2920         }
2921 
2922         /*
2923          * In case of Host Controller v3.00, find out whether clock
2924          * multiplier is supported.
2925          */
2926         host->clk_mul = (caps[1] & SDHCI_CLOCK_MUL_MASK) >>
2927                         SDHCI_CLOCK_MUL_SHIFT;
2928 
2929         /*
2930          * In case the value in Clock Multiplier is 0, then programmable
2931          * clock mode is not supported, otherwise the actual clock
2932          * multiplier is one more than the value of Clock Multiplier
2933          * in the Capabilities Register.
2934          */
2935         if (host->clk_mul)
2936                 host->clk_mul += 1;
2937 
2938         /*
2939          * Set host parameters.
2940          */
2941         mmc->ops = &sdhci_ops;
2942         mmc->f_max = host->max_clk;
2943         if (host->ops->get_min_clock)
2944                 mmc->f_min = host->ops->get_min_clock(host);
2945         else if (host->version >= SDHCI_SPEC_300) {
2946                 if (host->clk_mul) {
2947                         mmc->f_min = (host->max_clk * host->clk_mul) / 1024;
2948                         mmc->f_max = host->max_clk * host->clk_mul;
2949                 } else
2950                         mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_300;
2951         } else
2952                 mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_200;
2953 
2954         if (!(host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK)) {
2955                 host->timeout_clk = (caps[0] & SDHCI_TIMEOUT_CLK_MASK) >>
2956                                         SDHCI_TIMEOUT_CLK_SHIFT;
2957                 if (host->timeout_clk == 0) {
2958                         if (host->ops->get_timeout_clock) {
2959                                 host->timeout_clk =
2960                                         host->ops->get_timeout_clock(host);
2961                         } else {
2962                                 pr_err("%s: Hardware doesn't specify timeout clock frequency.\n",
2963                                         mmc_hostname(mmc));
2964                                 return -ENODEV;
2965                         }
2966                 }
2967 
2968                 if (caps[0] & SDHCI_TIMEOUT_CLK_UNIT)
2969                         host->timeout_clk *= 1000;
2970 
2971                 mmc->max_busy_timeout = host->ops->get_max_timeout_count ?
2972                         host->ops->get_max_timeout_count(host) : 1 << 27;
2973                 mmc->max_busy_timeout /= host->timeout_clk;
2974         }
2975 
2976         if (override_timeout_clk)
2977                 host->timeout_clk = override_timeout_clk;
2978 
2979         mmc->caps |= MMC_CAP_SDIO_IRQ | MMC_CAP_ERASE | MMC_CAP_CMD23;
2980         mmc->caps2 |= MMC_CAP2_SDIO_IRQ_NOTHREAD;
2981 
2982         if (host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12)
2983                 host->flags |= SDHCI_AUTO_CMD12;
2984 
2985         /* Auto-CMD23 stuff only works in ADMA or PIO. */
2986         if ((host->version >= SDHCI_SPEC_300) &&
2987             ((host->flags & SDHCI_USE_ADMA) ||
2988              !(host->flags & SDHCI_USE_SDMA))) {
2989                 host->flags |= SDHCI_AUTO_CMD23;
2990                 DBG("%s: Auto-CMD23 available\n", mmc_hostname(mmc));
2991         } else {
2992                 DBG("%s: Auto-CMD23 unavailable\n", mmc_hostname(mmc));
2993         }
2994 
2995         /*
2996          * A controller may support 8-bit width, but the board itself
2997          * might not have the pins brought out.  Boards that support
2998          * 8-bit width must set "mmc->caps |= MMC_CAP_8_BIT_DATA;" in
2999          * their platform code before calling sdhci_add_host(), and we
3000          * won't assume 8-bit width for hosts without that CAP.
3001          */
3002         if (!(host->quirks & SDHCI_QUIRK_FORCE_1_BIT_DATA))
3003                 mmc->caps |= MMC_CAP_4_BIT_DATA;
3004 
3005         if (host->quirks2 & SDHCI_QUIRK2_HOST_NO_CMD23)
3006                 mmc->caps &= ~MMC_CAP_CMD23;
3007 
3008         if (caps[0] & SDHCI_CAN_DO_HISPD)
3009                 mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
3010 
3011         if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) &&
3012             !(mmc->caps & MMC_CAP_NONREMOVABLE))
3013                 mmc->caps |= MMC_CAP_NEEDS_POLL;
3014 
3015         /* If there are external regulators, get them */
3016         if (mmc_regulator_get_supply(mmc) == -EPROBE_DEFER)
3017                 return -EPROBE_DEFER;
3018 
3019         /* If vqmmc regulator and no 1.8V signalling, then there's no UHS */
3020         if (!IS_ERR(mmc->supply.vqmmc)) {
3021                 ret = regulator_enable(mmc->supply.vqmmc);
3022                 if (!regulator_is_supported_voltage(mmc->supply.vqmmc, 1700000,
3023                                                     1950000))
3024                         caps[1] &= ~(SDHCI_SUPPORT_SDR104 |
3025                                         SDHCI_SUPPORT_SDR50 |
3026                                         SDHCI_SUPPORT_DDR50);
3027                 if (ret) {
3028                         pr_warn("%s: Failed to enable vqmmc regulator: %d\n",
3029                                 mmc_hostname(mmc), ret);
3030                         mmc->supply.vqmmc = NULL;
3031                 }
3032         }
3033 
3034         if (host->quirks2 & SDHCI_QUIRK2_NO_1_8_V)
3035                 caps[1] &= ~(SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 |
3036                        SDHCI_SUPPORT_DDR50);
3037 
3038         /* Any UHS-I mode in caps implies SDR12 and SDR25 support. */
3039         if (caps[1] & (SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 |
3040                        SDHCI_SUPPORT_DDR50))
3041                 mmc->caps |= MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25;
3042 
3043         /* SDR104 supports also implies SDR50 support */
3044         if (caps[1] & SDHCI_SUPPORT_SDR104) {
3045                 mmc->caps |= MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_SDR50;
3046                 /* SD3.0: SDR104 is supported so (for eMMC) the caps2
3047                  * field can be promoted to support HS200.
3048                  */
3049                 if (!(host->quirks2 & SDHCI_QUIRK2_BROKEN_HS200)) {
3050                         mmc->caps2 |= MMC_CAP2_HS200;
3051                         if (IS_ERR(mmc->supply.vqmmc) ||
3052                                         !regulator_is_supported_voltage
3053                                         (mmc->supply.vqmmc, 1100000, 1300000))
3054                                 mmc->caps2 &= ~MMC_CAP2_HS200_1_2V_SDR;
3055                 }
3056         } else if (caps[1] & SDHCI_SUPPORT_SDR50)
3057                 mmc->caps |= MMC_CAP_UHS_SDR50;
3058 
3059         if ((caps[1] & SDHCI_SUPPORT_DDR50) &&
3060                 !(host->quirks2 & SDHCI_QUIRK2_BROKEN_DDR50))
3061                 mmc->caps |= MMC_CAP_UHS_DDR50;
3062 
3063         /* Does the host need tuning for SDR50? */
3064         if (caps[1] & SDHCI_USE_SDR50_TUNING)
3065                 host->flags |= SDHCI_SDR50_NEEDS_TUNING;
3066 
3067         /* Does the host need tuning for SDR104 / HS200? */
3068         if (mmc->caps2 & MMC_CAP2_HS200)
3069                 host->flags |= SDHCI_SDR104_NEEDS_TUNING;
3070 
3071         /* Driver Type(s) (A, C, D) supported by the host */
3072         if (caps[1] & SDHCI_DRIVER_TYPE_A)
3073                 mmc->caps |= MMC_CAP_DRIVER_TYPE_A;
3074         if (caps[1] & SDHCI_DRIVER_TYPE_C)
3075                 mmc->caps |= MMC_CAP_DRIVER_TYPE_C;
3076         if (caps[1] & SDHCI_DRIVER_TYPE_D)
3077                 mmc->caps |= MMC_CAP_DRIVER_TYPE_D;
3078 
3079         /* Initial value for re-tuning timer count */
3080         host->tuning_count = (caps[1] & SDHCI_RETUNING_TIMER_COUNT_MASK) >>
3081                               SDHCI_RETUNING_TIMER_COUNT_SHIFT;
3082 
3083         /*
3084          * In case Re-tuning Timer is not disabled, the actual value of
3085          * re-tuning timer will be 2 ^ (n - 1).
3086          */
3087         if (host->tuning_count)
3088                 host->tuning_count = 1 << (host->tuning_count - 1);
3089 
3090         /* Re-tuning mode supported by the Host Controller */
3091         host->tuning_mode = (caps[1] & SDHCI_RETUNING_MODE_MASK) >>
3092                              SDHCI_RETUNING_MODE_SHIFT;
3093 
3094         ocr_avail = 0;
3095 
3096         /*
3097          * According to SD Host Controller spec v3.00, if the Host System
3098          * can afford more than 150mA, Host Driver should set XPC to 1. Also
3099          * the value is meaningful only if Voltage Support in the Capabilities
3100          * register is set. The actual current value is 4 times the register
3101          * value.
3102          */
3103         max_current_caps = sdhci_readl(host, SDHCI_MAX_CURRENT);
3104         if (!max_current_caps && !IS_ERR(mmc->supply.vmmc)) {
3105                 int curr = regulator_get_current_limit(mmc->supply.vmmc);
3106                 if (curr > 0) {
3107 
3108                         /* convert to SDHCI_MAX_CURRENT format */
3109                         curr = curr/1000;  /* convert to mA */
3110                         curr = curr/SDHCI_MAX_CURRENT_MULTIPLIER;
3111 
3112                         curr = min_t(u32, curr, SDHCI_MAX_CURRENT_LIMIT);
3113                         max_current_caps =
3114                                 (curr << SDHCI_MAX_CURRENT_330_SHIFT) |
3115                                 (curr << SDHCI_MAX_CURRENT_300_SHIFT) |
3116                                 (curr << SDHCI_MAX_CURRENT_180_SHIFT);
3117                 }
3118         }
3119 
3120         if (caps[0] & SDHCI_CAN_VDD_330) {
3121                 ocr_avail |= MMC_VDD_32_33 | MMC_VDD_33_34;
3122 
3123                 mmc->max_current_330 = ((max_current_caps &
3124                                    SDHCI_MAX_CURRENT_330_MASK) >>
3125                                    SDHCI_MAX_CURRENT_330_SHIFT) *
3126                                    SDHCI_MAX_CURRENT_MULTIPLIER;
3127         }
3128         if (caps[0] & SDHCI_CAN_VDD_300) {
3129                 ocr_avail |= MMC_VDD_29_30 | MMC_VDD_30_31;
3130 
3131                 mmc->max_current_300 = ((max_current_caps &
3132                                    SDHCI_MAX_CURRENT_300_MASK) >>
3133                                    SDHCI_MAX_CURRENT_300_SHIFT) *
3134                                    SDHCI_MAX_CURRENT_MULTIPLIER;
3135         }
3136         if (caps[0] & SDHCI_CAN_VDD_180) {
3137                 ocr_avail |= MMC_VDD_165_195;
3138 
3139                 mmc->max_current_180 = ((max_current_caps &
3140                                    SDHCI_MAX_CURRENT_180_MASK) >>
3141                                    SDHCI_MAX_CURRENT_180_SHIFT) *
3142                                    SDHCI_MAX_CURRENT_MULTIPLIER;
3143         }
3144 
3145         /* If OCR set by external regulators, use it instead */
3146         if (mmc->ocr_avail)
3147                 ocr_avail = mmc->ocr_avail;
3148 
3149         if (host->ocr_mask)
3150                 ocr_avail &= host->ocr_mask;
3151 
3152         mmc->ocr_avail = ocr_avail;
3153         mmc->ocr_avail_sdio = ocr_avail;
3154         if (host->ocr_avail_sdio)
3155                 mmc->ocr_avail_sdio &= host->ocr_avail_sdio;
3156         mmc->ocr_avail_sd = ocr_avail;
3157         if (host->ocr_avail_sd)
3158                 mmc->ocr_avail_sd &= host->ocr_avail_sd;
3159         else /* normal SD controllers don't support 1.8V */
3160                 mmc->ocr_avail_sd &= ~MMC_VDD_165_195;
3161         mmc->ocr_avail_mmc = ocr_avail;
3162         if (host->ocr_avail_mmc)
3163                 mmc->ocr_avail_mmc &= host->ocr_avail_mmc;
3164 
3165         if (mmc->ocr_avail == 0) {
3166                 pr_err("%s: Hardware doesn't report any "
3167                         "support voltages.\n", mmc_hostname(mmc));
3168                 return -ENODEV;
3169         }
3170 
3171         spin_lock_init(&host->lock);
3172 
3173         /*
3174          * Maximum number of segments. Depends on if the hardware
3175          * can do scatter/gather or not.
3176          */
3177         if (host->flags & SDHCI_USE_ADMA)
3178                 mmc->max_segs = 128;
3179         else if (host->flags & SDHCI_USE_SDMA)
3180                 mmc->max_segs = 1;
3181         else /* PIO */
3182                 mmc->max_segs = 128;
3183 
3184         /*
3185          * Maximum number of sectors in one transfer. Limited by DMA boundary
3186          * size (512KiB).
3187          */
3188         mmc->max_req_size = 524288;
3189 
3190         /*
3191          * Maximum segment size. Could be one segment with the maximum number
3192          * of bytes. When doing hardware scatter/gather, each entry cannot
3193          * be larger than 64 KiB though.
3194          */
3195         if (host->flags & SDHCI_USE_ADMA) {
3196                 if (host->quirks & SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC)
3197                         mmc->max_seg_size = 65535;
3198                 else
3199                         mmc->max_seg_size = 65536;
3200         } else {
3201                 mmc->max_seg_size = mmc->max_req_size;
3202         }
3203 
3204         /*
3205          * Maximum block size. This varies from controller to controller and
3206          * is specified in the capabilities register.
3207          */
3208         if (host->quirks & SDHCI_QUIRK_FORCE_BLK_SZ_2048) {
3209                 mmc->max_blk_size = 2;
3210         } else {
3211                 mmc->max_blk_size = (caps[0] & SDHCI_MAX_BLOCK_MASK) >>
3212                                 SDHCI_MAX_BLOCK_SHIFT;
3213                 if (mmc->max_blk_size >= 3) {
3214                         pr_warn("%s: Invalid maximum block size, assuming 512 bytes\n",
3215                                 mmc_hostname(mmc));
3216                         mmc->max_blk_size = 0;
3217                 }
3218         }
3219 
3220         mmc->max_blk_size = 512 << mmc->max_blk_size;
3221 
3222         /*
3223          * Maximum block count.
3224          */
3225         mmc->max_blk_count = (host->quirks & SDHCI_QUIRK_NO_MULTIBLOCK) ? 1 : 65535;
3226 
3227         /*
3228          * Init tasklets.
3229          */
3230         tasklet_init(&host->finish_tasklet,
3231                 sdhci_tasklet_finish, (unsigned long)host);
3232 
3233         setup_timer(&host->timer, sdhci_timeout_timer, (unsigned long)host);
3234 
3235         if (host->version >= SDHCI_SPEC_300) {
3236                 init_waitqueue_head(&host->buf_ready_int);
3237 
3238                 /* Initialize re-tuning timer */
3239                 init_timer(&host->tuning_timer);
3240                 host->tuning_timer.data = (unsigned long)host;
3241                 host->tuning_timer.function = sdhci_tuning_timer;
3242         }
3243 
3244         sdhci_init(host, 0);
3245 
3246         ret = request_threaded_irq(host->irq, sdhci_irq, sdhci_thread_irq,
3247                                    IRQF_SHARED, mmc_hostname(mmc), host);
3248         if (ret) {
3249                 pr_err("%s: Failed to request IRQ %d: %d\n",
3250                        mmc_hostname(mmc), host->irq, ret);
3251                 goto untasklet;
3252         }
3253 
3254 #ifdef CONFIG_MMC_DEBUG
3255         sdhci_dumpregs(host);
3256 #endif
3257 
3258 #ifdef SDHCI_USE_LEDS_CLASS
3259         snprintf(host->led_name, sizeof(host->led_name),
3260                 "%s::", mmc_hostname(mmc));
3261         host->led.name = host->led_name;
3262         host->led.brightness = LED_OFF;
3263         host->led.default_trigger = mmc_hostname(mmc);
3264         host->led.brightness_set = sdhci_led_control;
3265 
3266         ret = led_classdev_register(mmc_dev(mmc), &host->led);
3267         if (ret) {
3268                 pr_err("%s: Failed to register LED device: %d\n",
3269                        mmc_hostname(mmc), ret);
3270                 goto reset;
3271         }
3272 #endif
3273 
3274         mmiowb();
3275 
3276         mmc_add_host(mmc);
3277 
3278         pr_info("%s: SDHCI controller on %s [%s] using %s\n",
3279                 mmc_hostname(mmc), host->hw_name, dev_name(mmc_dev(mmc)),
3280                 (host->flags & SDHCI_USE_ADMA) ? "ADMA" :
3281                 (host->flags & SDHCI_USE_SDMA) ? "DMA" : "PIO");
3282 
3283         sdhci_enable_card_detection(host);
3284 
3285         return 0;
3286 
3287 #ifdef SDHCI_USE_LEDS_CLASS
3288 reset:
3289         sdhci_do_reset(host, SDHCI_RESET_ALL);
3290         sdhci_writel(host, 0, SDHCI_INT_ENABLE);
3291         sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
3292         free_irq(host->irq, host);
3293 #endif
3294 untasklet:
3295         tasklet_kill(&host->finish_tasklet);
3296 
3297         return ret;
3298 }
3299 
3300 EXPORT_SYMBOL_GPL(sdhci_add_host);
3301 
3302 void sdhci_remove_host(struct sdhci_host *host, int dead)
3303 {
3304         struct mmc_host *mmc = host->mmc;
3305         unsigned long flags;
3306 
3307         if (dead) {
3308                 spin_lock_irqsave(&host->lock, flags);
3309 
3310                 host->flags |= SDHCI_DEVICE_DEAD;
3311 
3312                 if (host->mrq) {
3313                         pr_err("%s: Controller removed during "
3314                                 " transfer!\n", mmc_hostname(mmc));
3315 
3316                         host->mrq->cmd->error = -ENOMEDIUM;
3317                         tasklet_schedule(&host->finish_tasklet);
3318                 }
3319 
3320                 spin_unlock_irqrestore(&host->lock, flags);
3321         }
3322 
3323         sdhci_disable_card_detection(host);
3324 
3325         mmc_remove_host(mmc);
3326 
3327 #ifdef SDHCI_USE_LEDS_CLASS
3328         led_classdev_unregister(&host->led);
3329 #endif
3330 
3331         if (!dead)
3332                 sdhci_do_reset(host, SDHCI_RESET_ALL);
3333 
3334         sdhci_writel(host, 0, SDHCI_INT_ENABLE);
3335         sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
3336         free_irq(host->irq, host);
3337 
3338         del_timer_sync(&host->timer);
3339 
3340         tasklet_kill(&host->finish_tasklet);
3341 
3342         if (!IS_ERR(mmc->supply.vmmc))
3343                 regulator_disable(mmc->supply.vmmc);
3344 
3345         if (!IS_ERR(mmc->supply.vqmmc))
3346                 regulator_disable(mmc->supply.vqmmc);
3347 
3348         if (host->adma_desc)
3349                 dma_free_coherent(mmc_dev(mmc), ADMA_SIZE,
3350                                   host->adma_desc, host->adma_addr);
3351         kfree(host->align_buffer);
3352 
3353         host->adma_desc = NULL;
3354         host->align_buffer = NULL;
3355 }
3356 
3357 EXPORT_SYMBOL_GPL(sdhci_remove_host);
3358 
3359 void sdhci_free_host(struct sdhci_host *host)
3360 {
3361         mmc_free_host(host->mmc);
3362 }
3363 
3364 EXPORT_SYMBOL_GPL(sdhci_free_host);
3365 
3366 /*****************************************************************************\
3367  *                                                                           *
3368  * Driver init/exit                                                          *
3369  *                                                                           *
3370 \*****************************************************************************/
3371 
3372 static int __init sdhci_drv_init(void)
3373 {
3374         pr_info(DRIVER_NAME
3375                 ": Secure Digital Host Controller Interface driver\n");
3376         pr_info(DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
3377 
3378         return 0;
3379 }
3380 
3381 static void __exit sdhci_drv_exit(void)
3382 {
3383 }
3384 
3385 module_init(sdhci_drv_init);
3386 module_exit(sdhci_drv_exit);
3387 
3388 module_param(debug_quirks, uint, 0444);
3389 module_param(debug_quirks2, uint, 0444);
3390 
3391 MODULE_AUTHOR("Pierre Ossman <pierre@ossman.eu>");
3392 MODULE_DESCRIPTION("Secure Digital Host Controller Interface core driver");
3393 MODULE_LICENSE("GPL");
3394 
3395 MODULE_PARM_DESC(debug_quirks, "Force certain quirks.");
3396 MODULE_PARM_DESC(debug_quirks2, "Force certain other quirks.");
3397 

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