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dma-mapping: add the device argument to dma_mapping_error()
[deliverable/linux.git] / drivers / mmc / host / sdhci.c
1 /*
2 * linux/drivers/mmc/host/sdhci.c - Secure Digital Host Controller Interface driver
3 *
4 * Copyright (C) 2005-2008 Pierre Ossman, All Rights Reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or (at
9 * your option) any later version.
10 *
11 * Thanks to the following companies for their support:
12 *
13 * - JMicron (hardware and technical support)
14 */
15
16 #include <linux/delay.h>
17 #include <linux/highmem.h>
18 #include <linux/io.h>
19 #include <linux/dma-mapping.h>
20 #include <linux/scatterlist.h>
21
22 #include <linux/leds.h>
23
24 #include <linux/mmc/host.h>
25
26 #include "sdhci.h"
27
28 #define DRIVER_NAME "sdhci"
29
30 #define DBG(f, x...) \
31 pr_debug(DRIVER_NAME " [%s()]: " f, __func__,## x)
32
33 static unsigned int debug_quirks = 0;
34
35 static void sdhci_prepare_data(struct sdhci_host *, struct mmc_data *);
36 static void sdhci_finish_data(struct sdhci_host *);
37
38 static void sdhci_send_command(struct sdhci_host *, struct mmc_command *);
39 static void sdhci_finish_command(struct sdhci_host *);
40
41 static void sdhci_dumpregs(struct sdhci_host *host)
42 {
43 printk(KERN_DEBUG DRIVER_NAME ": ============== REGISTER DUMP ==============\n");
44
45 printk(KERN_DEBUG DRIVER_NAME ": Sys addr: 0x%08x | Version: 0x%08x\n",
46 readl(host->ioaddr + SDHCI_DMA_ADDRESS),
47 readw(host->ioaddr + SDHCI_HOST_VERSION));
48 printk(KERN_DEBUG DRIVER_NAME ": Blk size: 0x%08x | Blk cnt: 0x%08x\n",
49 readw(host->ioaddr + SDHCI_BLOCK_SIZE),
50 readw(host->ioaddr + SDHCI_BLOCK_COUNT));
51 printk(KERN_DEBUG DRIVER_NAME ": Argument: 0x%08x | Trn mode: 0x%08x\n",
52 readl(host->ioaddr + SDHCI_ARGUMENT),
53 readw(host->ioaddr + SDHCI_TRANSFER_MODE));
54 printk(KERN_DEBUG DRIVER_NAME ": Present: 0x%08x | Host ctl: 0x%08x\n",
55 readl(host->ioaddr + SDHCI_PRESENT_STATE),
56 readb(host->ioaddr + SDHCI_HOST_CONTROL));
57 printk(KERN_DEBUG DRIVER_NAME ": Power: 0x%08x | Blk gap: 0x%08x\n",
58 readb(host->ioaddr + SDHCI_POWER_CONTROL),
59 readb(host->ioaddr + SDHCI_BLOCK_GAP_CONTROL));
60 printk(KERN_DEBUG DRIVER_NAME ": Wake-up: 0x%08x | Clock: 0x%08x\n",
61 readb(host->ioaddr + SDHCI_WAKE_UP_CONTROL),
62 readw(host->ioaddr + SDHCI_CLOCK_CONTROL));
63 printk(KERN_DEBUG DRIVER_NAME ": Timeout: 0x%08x | Int stat: 0x%08x\n",
64 readb(host->ioaddr + SDHCI_TIMEOUT_CONTROL),
65 readl(host->ioaddr + SDHCI_INT_STATUS));
66 printk(KERN_DEBUG DRIVER_NAME ": Int enab: 0x%08x | Sig enab: 0x%08x\n",
67 readl(host->ioaddr + SDHCI_INT_ENABLE),
68 readl(host->ioaddr + SDHCI_SIGNAL_ENABLE));
69 printk(KERN_DEBUG DRIVER_NAME ": AC12 err: 0x%08x | Slot int: 0x%08x\n",
70 readw(host->ioaddr + SDHCI_ACMD12_ERR),
71 readw(host->ioaddr + SDHCI_SLOT_INT_STATUS));
72 printk(KERN_DEBUG DRIVER_NAME ": Caps: 0x%08x | Max curr: 0x%08x\n",
73 readl(host->ioaddr + SDHCI_CAPABILITIES),
74 readl(host->ioaddr + SDHCI_MAX_CURRENT));
75
76 printk(KERN_DEBUG DRIVER_NAME ": ===========================================\n");
77 }
78
79 /*****************************************************************************\
80 * *
81 * Low level functions *
82 * *
83 \*****************************************************************************/
84
85 static void sdhci_reset(struct sdhci_host *host, u8 mask)
86 {
87 unsigned long timeout;
88
89 if (host->quirks & SDHCI_QUIRK_NO_CARD_NO_RESET) {
90 if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) &
91 SDHCI_CARD_PRESENT))
92 return;
93 }
94
95 writeb(mask, host->ioaddr + SDHCI_SOFTWARE_RESET);
96
97 if (mask & SDHCI_RESET_ALL)
98 host->clock = 0;
99
100 /* Wait max 100 ms */
101 timeout = 100;
102
103 /* hw clears the bit when it's done */
104 while (readb(host->ioaddr + SDHCI_SOFTWARE_RESET) & mask) {
105 if (timeout == 0) {
106 printk(KERN_ERR "%s: Reset 0x%x never completed.\n",
107 mmc_hostname(host->mmc), (int)mask);
108 sdhci_dumpregs(host);
109 return;
110 }
111 timeout--;
112 mdelay(1);
113 }
114 }
115
116 static void sdhci_init(struct sdhci_host *host)
117 {
118 u32 intmask;
119
120 sdhci_reset(host, SDHCI_RESET_ALL);
121
122 intmask = SDHCI_INT_BUS_POWER | SDHCI_INT_DATA_END_BIT |
123 SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_TIMEOUT | SDHCI_INT_INDEX |
124 SDHCI_INT_END_BIT | SDHCI_INT_CRC | SDHCI_INT_TIMEOUT |
125 SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT |
126 SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL |
127 SDHCI_INT_DMA_END | SDHCI_INT_DATA_END | SDHCI_INT_RESPONSE |
128 SDHCI_INT_ADMA_ERROR;
129
130 writel(intmask, host->ioaddr + SDHCI_INT_ENABLE);
131 writel(intmask, host->ioaddr + SDHCI_SIGNAL_ENABLE);
132 }
133
134 static void sdhci_activate_led(struct sdhci_host *host)
135 {
136 u8 ctrl;
137
138 ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
139 ctrl |= SDHCI_CTRL_LED;
140 writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
141 }
142
143 static void sdhci_deactivate_led(struct sdhci_host *host)
144 {
145 u8 ctrl;
146
147 ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
148 ctrl &= ~SDHCI_CTRL_LED;
149 writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
150 }
151
152 #ifdef CONFIG_LEDS_CLASS
153 static void sdhci_led_control(struct led_classdev *led,
154 enum led_brightness brightness)
155 {
156 struct sdhci_host *host = container_of(led, struct sdhci_host, led);
157 unsigned long flags;
158
159 spin_lock_irqsave(&host->lock, flags);
160
161 if (brightness == LED_OFF)
162 sdhci_deactivate_led(host);
163 else
164 sdhci_activate_led(host);
165
166 spin_unlock_irqrestore(&host->lock, flags);
167 }
168 #endif
169
170 /*****************************************************************************\
171 * *
172 * Core functions *
173 * *
174 \*****************************************************************************/
175
176 static void sdhci_read_block_pio(struct sdhci_host *host)
177 {
178 unsigned long flags;
179 size_t blksize, len, chunk;
180 u32 scratch;
181 u8 *buf;
182
183 DBG("PIO reading\n");
184
185 blksize = host->data->blksz;
186 chunk = 0;
187
188 local_irq_save(flags);
189
190 while (blksize) {
191 if (!sg_miter_next(&host->sg_miter))
192 BUG();
193
194 len = min(host->sg_miter.length, blksize);
195
196 blksize -= len;
197 host->sg_miter.consumed = len;
198
199 buf = host->sg_miter.addr;
200
201 while (len) {
202 if (chunk == 0) {
203 scratch = readl(host->ioaddr + SDHCI_BUFFER);
204 chunk = 4;
205 }
206
207 *buf = scratch & 0xFF;
208
209 buf++;
210 scratch >>= 8;
211 chunk--;
212 len--;
213 }
214 }
215
216 sg_miter_stop(&host->sg_miter);
217
218 local_irq_restore(flags);
219 }
220
221 static void sdhci_write_block_pio(struct sdhci_host *host)
222 {
223 unsigned long flags;
224 size_t blksize, len, chunk;
225 u32 scratch;
226 u8 *buf;
227
228 DBG("PIO writing\n");
229
230 blksize = host->data->blksz;
231 chunk = 0;
232 scratch = 0;
233
234 local_irq_save(flags);
235
236 while (blksize) {
237 if (!sg_miter_next(&host->sg_miter))
238 BUG();
239
240 len = min(host->sg_miter.length, blksize);
241
242 blksize -= len;
243 host->sg_miter.consumed = len;
244
245 buf = host->sg_miter.addr;
246
247 while (len) {
248 scratch |= (u32)*buf << (chunk * 8);
249
250 buf++;
251 chunk++;
252 len--;
253
254 if ((chunk == 4) || ((len == 0) && (blksize == 0))) {
255 writel(scratch, host->ioaddr + SDHCI_BUFFER);
256 chunk = 0;
257 scratch = 0;
258 }
259 }
260 }
261
262 sg_miter_stop(&host->sg_miter);
263
264 local_irq_restore(flags);
265 }
266
267 static void sdhci_transfer_pio(struct sdhci_host *host)
268 {
269 u32 mask;
270
271 BUG_ON(!host->data);
272
273 if (host->blocks == 0)
274 return;
275
276 if (host->data->flags & MMC_DATA_READ)
277 mask = SDHCI_DATA_AVAILABLE;
278 else
279 mask = SDHCI_SPACE_AVAILABLE;
280
281 while (readl(host->ioaddr + SDHCI_PRESENT_STATE) & mask) {
282 if (host->data->flags & MMC_DATA_READ)
283 sdhci_read_block_pio(host);
284 else
285 sdhci_write_block_pio(host);
286
287 host->blocks--;
288 if (host->blocks == 0)
289 break;
290 }
291
292 DBG("PIO transfer complete.\n");
293 }
294
295 static char *sdhci_kmap_atomic(struct scatterlist *sg, unsigned long *flags)
296 {
297 local_irq_save(*flags);
298 return kmap_atomic(sg_page(sg), KM_BIO_SRC_IRQ) + sg->offset;
299 }
300
301 static void sdhci_kunmap_atomic(void *buffer, unsigned long *flags)
302 {
303 kunmap_atomic(buffer, KM_BIO_SRC_IRQ);
304 local_irq_restore(*flags);
305 }
306
307 static int sdhci_adma_table_pre(struct sdhci_host *host,
308 struct mmc_data *data)
309 {
310 int direction;
311
312 u8 *desc;
313 u8 *align;
314 dma_addr_t addr;
315 dma_addr_t align_addr;
316 int len, offset;
317
318 struct scatterlist *sg;
319 int i;
320 char *buffer;
321 unsigned long flags;
322
323 /*
324 * The spec does not specify endianness of descriptor table.
325 * We currently guess that it is LE.
326 */
327
328 if (data->flags & MMC_DATA_READ)
329 direction = DMA_FROM_DEVICE;
330 else
331 direction = DMA_TO_DEVICE;
332
333 /*
334 * The ADMA descriptor table is mapped further down as we
335 * need to fill it with data first.
336 */
337
338 host->align_addr = dma_map_single(mmc_dev(host->mmc),
339 host->align_buffer, 128 * 4, direction);
340 if (dma_mapping_error(mmc_dev(host->mmc), host->align_addr))
341 goto fail;
342 BUG_ON(host->align_addr & 0x3);
343
344 host->sg_count = dma_map_sg(mmc_dev(host->mmc),
345 data->sg, data->sg_len, direction);
346 if (host->sg_count == 0)
347 goto unmap_align;
348
349 desc = host->adma_desc;
350 align = host->align_buffer;
351
352 align_addr = host->align_addr;
353
354 for_each_sg(data->sg, sg, host->sg_count, i) {
355 addr = sg_dma_address(sg);
356 len = sg_dma_len(sg);
357
358 /*
359 * The SDHCI specification states that ADMA
360 * addresses must be 32-bit aligned. If they
361 * aren't, then we use a bounce buffer for
362 * the (up to three) bytes that screw up the
363 * alignment.
364 */
365 offset = (4 - (addr & 0x3)) & 0x3;
366 if (offset) {
367 if (data->flags & MMC_DATA_WRITE) {
368 buffer = sdhci_kmap_atomic(sg, &flags);
369 WARN_ON(((long)buffer & PAGE_MASK) > (PAGE_SIZE - 3));
370 memcpy(align, buffer, offset);
371 sdhci_kunmap_atomic(buffer, &flags);
372 }
373
374 desc[7] = (align_addr >> 24) & 0xff;
375 desc[6] = (align_addr >> 16) & 0xff;
376 desc[5] = (align_addr >> 8) & 0xff;
377 desc[4] = (align_addr >> 0) & 0xff;
378
379 BUG_ON(offset > 65536);
380
381 desc[3] = (offset >> 8) & 0xff;
382 desc[2] = (offset >> 0) & 0xff;
383
384 desc[1] = 0x00;
385 desc[0] = 0x21; /* tran, valid */
386
387 align += 4;
388 align_addr += 4;
389
390 desc += 8;
391
392 addr += offset;
393 len -= offset;
394 }
395
396 desc[7] = (addr >> 24) & 0xff;
397 desc[6] = (addr >> 16) & 0xff;
398 desc[5] = (addr >> 8) & 0xff;
399 desc[4] = (addr >> 0) & 0xff;
400
401 BUG_ON(len > 65536);
402
403 desc[3] = (len >> 8) & 0xff;
404 desc[2] = (len >> 0) & 0xff;
405
406 desc[1] = 0x00;
407 desc[0] = 0x21; /* tran, valid */
408
409 desc += 8;
410
411 /*
412 * If this triggers then we have a calculation bug
413 * somewhere. :/
414 */
415 WARN_ON((desc - host->adma_desc) > (128 * 2 + 1) * 4);
416 }
417
418 /*
419 * Add a terminating entry.
420 */
421 desc[7] = 0;
422 desc[6] = 0;
423 desc[5] = 0;
424 desc[4] = 0;
425
426 desc[3] = 0;
427 desc[2] = 0;
428
429 desc[1] = 0x00;
430 desc[0] = 0x03; /* nop, end, valid */
431
432 /*
433 * Resync align buffer as we might have changed it.
434 */
435 if (data->flags & MMC_DATA_WRITE) {
436 dma_sync_single_for_device(mmc_dev(host->mmc),
437 host->align_addr, 128 * 4, direction);
438 }
439
440 host->adma_addr = dma_map_single(mmc_dev(host->mmc),
441 host->adma_desc, (128 * 2 + 1) * 4, DMA_TO_DEVICE);
442 if (dma_mapping_error(mmc_dev(host->mmc), host->align_addr))
443 goto unmap_entries;
444 BUG_ON(host->adma_addr & 0x3);
445
446 return 0;
447
448 unmap_entries:
449 dma_unmap_sg(mmc_dev(host->mmc), data->sg,
450 data->sg_len, direction);
451 unmap_align:
452 dma_unmap_single(mmc_dev(host->mmc), host->align_addr,
453 128 * 4, direction);
454 fail:
455 return -EINVAL;
456 }
457
458 static void sdhci_adma_table_post(struct sdhci_host *host,
459 struct mmc_data *data)
460 {
461 int direction;
462
463 struct scatterlist *sg;
464 int i, size;
465 u8 *align;
466 char *buffer;
467 unsigned long flags;
468
469 if (data->flags & MMC_DATA_READ)
470 direction = DMA_FROM_DEVICE;
471 else
472 direction = DMA_TO_DEVICE;
473
474 dma_unmap_single(mmc_dev(host->mmc), host->adma_addr,
475 (128 * 2 + 1) * 4, DMA_TO_DEVICE);
476
477 dma_unmap_single(mmc_dev(host->mmc), host->align_addr,
478 128 * 4, direction);
479
480 if (data->flags & MMC_DATA_READ) {
481 dma_sync_sg_for_cpu(mmc_dev(host->mmc), data->sg,
482 data->sg_len, direction);
483
484 align = host->align_buffer;
485
486 for_each_sg(data->sg, sg, host->sg_count, i) {
487 if (sg_dma_address(sg) & 0x3) {
488 size = 4 - (sg_dma_address(sg) & 0x3);
489
490 buffer = sdhci_kmap_atomic(sg, &flags);
491 WARN_ON(((long)buffer & PAGE_MASK) > (PAGE_SIZE - 3));
492 memcpy(buffer, align, size);
493 sdhci_kunmap_atomic(buffer, &flags);
494
495 align += 4;
496 }
497 }
498 }
499
500 dma_unmap_sg(mmc_dev(host->mmc), data->sg,
501 data->sg_len, direction);
502 }
503
504 static u8 sdhci_calc_timeout(struct sdhci_host *host, struct mmc_data *data)
505 {
506 u8 count;
507 unsigned target_timeout, current_timeout;
508
509 /*
510 * If the host controller provides us with an incorrect timeout
511 * value, just skip the check and use 0xE. The hardware may take
512 * longer to time out, but that's much better than having a too-short
513 * timeout value.
514 */
515 if ((host->quirks & SDHCI_QUIRK_BROKEN_TIMEOUT_VAL))
516 return 0xE;
517
518 /* timeout in us */
519 target_timeout = data->timeout_ns / 1000 +
520 data->timeout_clks / host->clock;
521
522 /*
523 * Figure out needed cycles.
524 * We do this in steps in order to fit inside a 32 bit int.
525 * The first step is the minimum timeout, which will have a
526 * minimum resolution of 6 bits:
527 * (1) 2^13*1000 > 2^22,
528 * (2) host->timeout_clk < 2^16
529 * =>
530 * (1) / (2) > 2^6
531 */
532 count = 0;
533 current_timeout = (1 << 13) * 1000 / host->timeout_clk;
534 while (current_timeout < target_timeout) {
535 count++;
536 current_timeout <<= 1;
537 if (count >= 0xF)
538 break;
539 }
540
541 if (count >= 0xF) {
542 printk(KERN_WARNING "%s: Too large timeout requested!\n",
543 mmc_hostname(host->mmc));
544 count = 0xE;
545 }
546
547 return count;
548 }
549
550 static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_data *data)
551 {
552 u8 count;
553 u8 ctrl;
554 int ret;
555
556 WARN_ON(host->data);
557
558 if (data == NULL)
559 return;
560
561 /* Sanity checks */
562 BUG_ON(data->blksz * data->blocks > 524288);
563 BUG_ON(data->blksz > host->mmc->max_blk_size);
564 BUG_ON(data->blocks > 65535);
565
566 host->data = data;
567 host->data_early = 0;
568
569 count = sdhci_calc_timeout(host, data);
570 writeb(count, host->ioaddr + SDHCI_TIMEOUT_CONTROL);
571
572 if (host->flags & SDHCI_USE_DMA)
573 host->flags |= SDHCI_REQ_USE_DMA;
574
575 /*
576 * FIXME: This doesn't account for merging when mapping the
577 * scatterlist.
578 */
579 if (host->flags & SDHCI_REQ_USE_DMA) {
580 int broken, i;
581 struct scatterlist *sg;
582
583 broken = 0;
584 if (host->flags & SDHCI_USE_ADMA) {
585 if (host->quirks & SDHCI_QUIRK_32BIT_ADMA_SIZE)
586 broken = 1;
587 } else {
588 if (host->quirks & SDHCI_QUIRK_32BIT_DMA_SIZE)
589 broken = 1;
590 }
591
592 if (unlikely(broken)) {
593 for_each_sg(data->sg, sg, data->sg_len, i) {
594 if (sg->length & 0x3) {
595 DBG("Reverting to PIO because of "
596 "transfer size (%d)\n",
597 sg->length);
598 host->flags &= ~SDHCI_REQ_USE_DMA;
599 break;
600 }
601 }
602 }
603 }
604
605 /*
606 * The assumption here being that alignment is the same after
607 * translation to device address space.
608 */
609 if (host->flags & SDHCI_REQ_USE_DMA) {
610 int broken, i;
611 struct scatterlist *sg;
612
613 broken = 0;
614 if (host->flags & SDHCI_USE_ADMA) {
615 /*
616 * As we use 3 byte chunks to work around
617 * alignment problems, we need to check this
618 * quirk.
619 */
620 if (host->quirks & SDHCI_QUIRK_32BIT_ADMA_SIZE)
621 broken = 1;
622 } else {
623 if (host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR)
624 broken = 1;
625 }
626
627 if (unlikely(broken)) {
628 for_each_sg(data->sg, sg, data->sg_len, i) {
629 if (sg->offset & 0x3) {
630 DBG("Reverting to PIO because of "
631 "bad alignment\n");
632 host->flags &= ~SDHCI_REQ_USE_DMA;
633 break;
634 }
635 }
636 }
637 }
638
639 if (host->flags & SDHCI_REQ_USE_DMA) {
640 if (host->flags & SDHCI_USE_ADMA) {
641 ret = sdhci_adma_table_pre(host, data);
642 if (ret) {
643 /*
644 * This only happens when someone fed
645 * us an invalid request.
646 */
647 WARN_ON(1);
648 host->flags &= ~SDHCI_USE_DMA;
649 } else {
650 writel(host->adma_addr,
651 host->ioaddr + SDHCI_ADMA_ADDRESS);
652 }
653 } else {
654 int sg_cnt;
655
656 sg_cnt = dma_map_sg(mmc_dev(host->mmc),
657 data->sg, data->sg_len,
658 (data->flags & MMC_DATA_READ) ?
659 DMA_FROM_DEVICE :
660 DMA_TO_DEVICE);
661 if (sg_cnt == 0) {
662 /*
663 * This only happens when someone fed
664 * us an invalid request.
665 */
666 WARN_ON(1);
667 host->flags &= ~SDHCI_USE_DMA;
668 } else {
669 WARN_ON(sg_cnt != 1);
670 writel(sg_dma_address(data->sg),
671 host->ioaddr + SDHCI_DMA_ADDRESS);
672 }
673 }
674 }
675
676 /*
677 * Always adjust the DMA selection as some controllers
678 * (e.g. JMicron) can't do PIO properly when the selection
679 * is ADMA.
680 */
681 if (host->version >= SDHCI_SPEC_200) {
682 ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
683 ctrl &= ~SDHCI_CTRL_DMA_MASK;
684 if ((host->flags & SDHCI_REQ_USE_DMA) &&
685 (host->flags & SDHCI_USE_ADMA))
686 ctrl |= SDHCI_CTRL_ADMA32;
687 else
688 ctrl |= SDHCI_CTRL_SDMA;
689 writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
690 }
691
692 if (!(host->flags & SDHCI_REQ_USE_DMA)) {
693 sg_miter_start(&host->sg_miter,
694 data->sg, data->sg_len, SG_MITER_ATOMIC);
695 host->blocks = data->blocks;
696 }
697
698 /* We do not handle DMA boundaries, so set it to max (512 KiB) */
699 writew(SDHCI_MAKE_BLKSZ(7, data->blksz),
700 host->ioaddr + SDHCI_BLOCK_SIZE);
701 writew(data->blocks, host->ioaddr + SDHCI_BLOCK_COUNT);
702 }
703
704 static void sdhci_set_transfer_mode(struct sdhci_host *host,
705 struct mmc_data *data)
706 {
707 u16 mode;
708
709 if (data == NULL)
710 return;
711
712 WARN_ON(!host->data);
713
714 mode = SDHCI_TRNS_BLK_CNT_EN;
715 if (data->blocks > 1)
716 mode |= SDHCI_TRNS_MULTI;
717 if (data->flags & MMC_DATA_READ)
718 mode |= SDHCI_TRNS_READ;
719 if (host->flags & SDHCI_REQ_USE_DMA)
720 mode |= SDHCI_TRNS_DMA;
721
722 writew(mode, host->ioaddr + SDHCI_TRANSFER_MODE);
723 }
724
725 static void sdhci_finish_data(struct sdhci_host *host)
726 {
727 struct mmc_data *data;
728
729 BUG_ON(!host->data);
730
731 data = host->data;
732 host->data = NULL;
733
734 if (host->flags & SDHCI_REQ_USE_DMA) {
735 if (host->flags & SDHCI_USE_ADMA)
736 sdhci_adma_table_post(host, data);
737 else {
738 dma_unmap_sg(mmc_dev(host->mmc), data->sg,
739 data->sg_len, (data->flags & MMC_DATA_READ) ?
740 DMA_FROM_DEVICE : DMA_TO_DEVICE);
741 }
742 }
743
744 /*
745 * The specification states that the block count register must
746 * be updated, but it does not specify at what point in the
747 * data flow. That makes the register entirely useless to read
748 * back so we have to assume that nothing made it to the card
749 * in the event of an error.
750 */
751 if (data->error)
752 data->bytes_xfered = 0;
753 else
754 data->bytes_xfered = data->blksz * data->blocks;
755
756 if (data->stop) {
757 /*
758 * The controller needs a reset of internal state machines
759 * upon error conditions.
760 */
761 if (data->error) {
762 sdhci_reset(host, SDHCI_RESET_CMD);
763 sdhci_reset(host, SDHCI_RESET_DATA);
764 }
765
766 sdhci_send_command(host, data->stop);
767 } else
768 tasklet_schedule(&host->finish_tasklet);
769 }
770
771 static void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
772 {
773 int flags;
774 u32 mask;
775 unsigned long timeout;
776
777 WARN_ON(host->cmd);
778
779 /* Wait max 10 ms */
780 timeout = 10;
781
782 mask = SDHCI_CMD_INHIBIT;
783 if ((cmd->data != NULL) || (cmd->flags & MMC_RSP_BUSY))
784 mask |= SDHCI_DATA_INHIBIT;
785
786 /* We shouldn't wait for data inihibit for stop commands, even
787 though they might use busy signaling */
788 if (host->mrq->data && (cmd == host->mrq->data->stop))
789 mask &= ~SDHCI_DATA_INHIBIT;
790
791 while (readl(host->ioaddr + SDHCI_PRESENT_STATE) & mask) {
792 if (timeout == 0) {
793 printk(KERN_ERR "%s: Controller never released "
794 "inhibit bit(s).\n", mmc_hostname(host->mmc));
795 sdhci_dumpregs(host);
796 cmd->error = -EIO;
797 tasklet_schedule(&host->finish_tasklet);
798 return;
799 }
800 timeout--;
801 mdelay(1);
802 }
803
804 mod_timer(&host->timer, jiffies + 10 * HZ);
805
806 host->cmd = cmd;
807
808 sdhci_prepare_data(host, cmd->data);
809
810 writel(cmd->arg, host->ioaddr + SDHCI_ARGUMENT);
811
812 sdhci_set_transfer_mode(host, cmd->data);
813
814 if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
815 printk(KERN_ERR "%s: Unsupported response type!\n",
816 mmc_hostname(host->mmc));
817 cmd->error = -EINVAL;
818 tasklet_schedule(&host->finish_tasklet);
819 return;
820 }
821
822 if (!(cmd->flags & MMC_RSP_PRESENT))
823 flags = SDHCI_CMD_RESP_NONE;
824 else if (cmd->flags & MMC_RSP_136)
825 flags = SDHCI_CMD_RESP_LONG;
826 else if (cmd->flags & MMC_RSP_BUSY)
827 flags = SDHCI_CMD_RESP_SHORT_BUSY;
828 else
829 flags = SDHCI_CMD_RESP_SHORT;
830
831 if (cmd->flags & MMC_RSP_CRC)
832 flags |= SDHCI_CMD_CRC;
833 if (cmd->flags & MMC_RSP_OPCODE)
834 flags |= SDHCI_CMD_INDEX;
835 if (cmd->data)
836 flags |= SDHCI_CMD_DATA;
837
838 writew(SDHCI_MAKE_CMD(cmd->opcode, flags),
839 host->ioaddr + SDHCI_COMMAND);
840 }
841
842 static void sdhci_finish_command(struct sdhci_host *host)
843 {
844 int i;
845
846 BUG_ON(host->cmd == NULL);
847
848 if (host->cmd->flags & MMC_RSP_PRESENT) {
849 if (host->cmd->flags & MMC_RSP_136) {
850 /* CRC is stripped so we need to do some shifting. */
851 for (i = 0;i < 4;i++) {
852 host->cmd->resp[i] = readl(host->ioaddr +
853 SDHCI_RESPONSE + (3-i)*4) << 8;
854 if (i != 3)
855 host->cmd->resp[i] |=
856 readb(host->ioaddr +
857 SDHCI_RESPONSE + (3-i)*4-1);
858 }
859 } else {
860 host->cmd->resp[0] = readl(host->ioaddr + SDHCI_RESPONSE);
861 }
862 }
863
864 host->cmd->error = 0;
865
866 if (host->data && host->data_early)
867 sdhci_finish_data(host);
868
869 if (!host->cmd->data)
870 tasklet_schedule(&host->finish_tasklet);
871
872 host->cmd = NULL;
873 }
874
875 static void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
876 {
877 int div;
878 u16 clk;
879 unsigned long timeout;
880
881 if (clock == host->clock)
882 return;
883
884 writew(0, host->ioaddr + SDHCI_CLOCK_CONTROL);
885
886 if (clock == 0)
887 goto out;
888
889 for (div = 1;div < 256;div *= 2) {
890 if ((host->max_clk / div) <= clock)
891 break;
892 }
893 div >>= 1;
894
895 clk = div << SDHCI_DIVIDER_SHIFT;
896 clk |= SDHCI_CLOCK_INT_EN;
897 writew(clk, host->ioaddr + SDHCI_CLOCK_CONTROL);
898
899 /* Wait max 10 ms */
900 timeout = 10;
901 while (!((clk = readw(host->ioaddr + SDHCI_CLOCK_CONTROL))
902 & SDHCI_CLOCK_INT_STABLE)) {
903 if (timeout == 0) {
904 printk(KERN_ERR "%s: Internal clock never "
905 "stabilised.\n", mmc_hostname(host->mmc));
906 sdhci_dumpregs(host);
907 return;
908 }
909 timeout--;
910 mdelay(1);
911 }
912
913 clk |= SDHCI_CLOCK_CARD_EN;
914 writew(clk, host->ioaddr + SDHCI_CLOCK_CONTROL);
915
916 out:
917 host->clock = clock;
918 }
919
920 static void sdhci_set_power(struct sdhci_host *host, unsigned short power)
921 {
922 u8 pwr;
923
924 if (host->power == power)
925 return;
926
927 if (power == (unsigned short)-1) {
928 writeb(0, host->ioaddr + SDHCI_POWER_CONTROL);
929 goto out;
930 }
931
932 /*
933 * Spec says that we should clear the power reg before setting
934 * a new value. Some controllers don't seem to like this though.
935 */
936 if (!(host->quirks & SDHCI_QUIRK_SINGLE_POWER_WRITE))
937 writeb(0, host->ioaddr + SDHCI_POWER_CONTROL);
938
939 pwr = SDHCI_POWER_ON;
940
941 switch (1 << power) {
942 case MMC_VDD_165_195:
943 pwr |= SDHCI_POWER_180;
944 break;
945 case MMC_VDD_29_30:
946 case MMC_VDD_30_31:
947 pwr |= SDHCI_POWER_300;
948 break;
949 case MMC_VDD_32_33:
950 case MMC_VDD_33_34:
951 pwr |= SDHCI_POWER_330;
952 break;
953 default:
954 BUG();
955 }
956
957 /*
958 * At least the Marvell CaFe chip gets confused if we set the voltage
959 * and set turn on power at the same time, so set the voltage first.
960 */
961 if ((host->quirks & SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER))
962 writeb(pwr & ~SDHCI_POWER_ON,
963 host->ioaddr + SDHCI_POWER_CONTROL);
964
965 writeb(pwr, host->ioaddr + SDHCI_POWER_CONTROL);
966
967 out:
968 host->power = power;
969 }
970
971 /*****************************************************************************\
972 * *
973 * MMC callbacks *
974 * *
975 \*****************************************************************************/
976
977 static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
978 {
979 struct sdhci_host *host;
980 unsigned long flags;
981
982 host = mmc_priv(mmc);
983
984 spin_lock_irqsave(&host->lock, flags);
985
986 WARN_ON(host->mrq != NULL);
987
988 #ifndef CONFIG_LEDS_CLASS
989 sdhci_activate_led(host);
990 #endif
991
992 host->mrq = mrq;
993
994 if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT)
995 || (host->flags & SDHCI_DEVICE_DEAD)) {
996 host->mrq->cmd->error = -ENOMEDIUM;
997 tasklet_schedule(&host->finish_tasklet);
998 } else
999 sdhci_send_command(host, mrq->cmd);
1000
1001 mmiowb();
1002 spin_unlock_irqrestore(&host->lock, flags);
1003 }
1004
1005 static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1006 {
1007 struct sdhci_host *host;
1008 unsigned long flags;
1009 u8 ctrl;
1010
1011 host = mmc_priv(mmc);
1012
1013 spin_lock_irqsave(&host->lock, flags);
1014
1015 if (host->flags & SDHCI_DEVICE_DEAD)
1016 goto out;
1017
1018 /*
1019 * Reset the chip on each power off.
1020 * Should clear out any weird states.
1021 */
1022 if (ios->power_mode == MMC_POWER_OFF) {
1023 writel(0, host->ioaddr + SDHCI_SIGNAL_ENABLE);
1024 sdhci_init(host);
1025 }
1026
1027 sdhci_set_clock(host, ios->clock);
1028
1029 if (ios->power_mode == MMC_POWER_OFF)
1030 sdhci_set_power(host, -1);
1031 else
1032 sdhci_set_power(host, ios->vdd);
1033
1034 ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
1035
1036 if (ios->bus_width == MMC_BUS_WIDTH_4)
1037 ctrl |= SDHCI_CTRL_4BITBUS;
1038 else
1039 ctrl &= ~SDHCI_CTRL_4BITBUS;
1040
1041 if (ios->timing == MMC_TIMING_SD_HS)
1042 ctrl |= SDHCI_CTRL_HISPD;
1043 else
1044 ctrl &= ~SDHCI_CTRL_HISPD;
1045
1046 writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
1047
1048 /*
1049 * Some (ENE) controllers go apeshit on some ios operation,
1050 * signalling timeout and CRC errors even on CMD0. Resetting
1051 * it on each ios seems to solve the problem.
1052 */
1053 if(host->quirks & SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS)
1054 sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
1055
1056 out:
1057 mmiowb();
1058 spin_unlock_irqrestore(&host->lock, flags);
1059 }
1060
1061 static int sdhci_get_ro(struct mmc_host *mmc)
1062 {
1063 struct sdhci_host *host;
1064 unsigned long flags;
1065 int present;
1066
1067 host = mmc_priv(mmc);
1068
1069 spin_lock_irqsave(&host->lock, flags);
1070
1071 if (host->flags & SDHCI_DEVICE_DEAD)
1072 present = 0;
1073 else
1074 present = readl(host->ioaddr + SDHCI_PRESENT_STATE);
1075
1076 spin_unlock_irqrestore(&host->lock, flags);
1077
1078 return !(present & SDHCI_WRITE_PROTECT);
1079 }
1080
1081 static void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable)
1082 {
1083 struct sdhci_host *host;
1084 unsigned long flags;
1085 u32 ier;
1086
1087 host = mmc_priv(mmc);
1088
1089 spin_lock_irqsave(&host->lock, flags);
1090
1091 if (host->flags & SDHCI_DEVICE_DEAD)
1092 goto out;
1093
1094 ier = readl(host->ioaddr + SDHCI_INT_ENABLE);
1095
1096 ier &= ~SDHCI_INT_CARD_INT;
1097 if (enable)
1098 ier |= SDHCI_INT_CARD_INT;
1099
1100 writel(ier, host->ioaddr + SDHCI_INT_ENABLE);
1101 writel(ier, host->ioaddr + SDHCI_SIGNAL_ENABLE);
1102
1103 out:
1104 mmiowb();
1105
1106 spin_unlock_irqrestore(&host->lock, flags);
1107 }
1108
1109 static const struct mmc_host_ops sdhci_ops = {
1110 .request = sdhci_request,
1111 .set_ios = sdhci_set_ios,
1112 .get_ro = sdhci_get_ro,
1113 .enable_sdio_irq = sdhci_enable_sdio_irq,
1114 };
1115
1116 /*****************************************************************************\
1117 * *
1118 * Tasklets *
1119 * *
1120 \*****************************************************************************/
1121
1122 static void sdhci_tasklet_card(unsigned long param)
1123 {
1124 struct sdhci_host *host;
1125 unsigned long flags;
1126
1127 host = (struct sdhci_host*)param;
1128
1129 spin_lock_irqsave(&host->lock, flags);
1130
1131 if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT)) {
1132 if (host->mrq) {
1133 printk(KERN_ERR "%s: Card removed during transfer!\n",
1134 mmc_hostname(host->mmc));
1135 printk(KERN_ERR "%s: Resetting controller.\n",
1136 mmc_hostname(host->mmc));
1137
1138 sdhci_reset(host, SDHCI_RESET_CMD);
1139 sdhci_reset(host, SDHCI_RESET_DATA);
1140
1141 host->mrq->cmd->error = -ENOMEDIUM;
1142 tasklet_schedule(&host->finish_tasklet);
1143 }
1144 }
1145
1146 spin_unlock_irqrestore(&host->lock, flags);
1147
1148 mmc_detect_change(host->mmc, msecs_to_jiffies(500));
1149 }
1150
1151 static void sdhci_tasklet_finish(unsigned long param)
1152 {
1153 struct sdhci_host *host;
1154 unsigned long flags;
1155 struct mmc_request *mrq;
1156
1157 host = (struct sdhci_host*)param;
1158
1159 spin_lock_irqsave(&host->lock, flags);
1160
1161 del_timer(&host->timer);
1162
1163 mrq = host->mrq;
1164
1165 /*
1166 * The controller needs a reset of internal state machines
1167 * upon error conditions.
1168 */
1169 if (!(host->flags & SDHCI_DEVICE_DEAD) &&
1170 (mrq->cmd->error ||
1171 (mrq->data && (mrq->data->error ||
1172 (mrq->data->stop && mrq->data->stop->error))) ||
1173 (host->quirks & SDHCI_QUIRK_RESET_AFTER_REQUEST))) {
1174
1175 /* Some controllers need this kick or reset won't work here */
1176 if (host->quirks & SDHCI_QUIRK_CLOCK_BEFORE_RESET) {
1177 unsigned int clock;
1178
1179 /* This is to force an update */
1180 clock = host->clock;
1181 host->clock = 0;
1182 sdhci_set_clock(host, clock);
1183 }
1184
1185 /* Spec says we should do both at the same time, but Ricoh
1186 controllers do not like that. */
1187 sdhci_reset(host, SDHCI_RESET_CMD);
1188 sdhci_reset(host, SDHCI_RESET_DATA);
1189 }
1190
1191 host->mrq = NULL;
1192 host->cmd = NULL;
1193 host->data = NULL;
1194
1195 #ifndef CONFIG_LEDS_CLASS
1196 sdhci_deactivate_led(host);
1197 #endif
1198
1199 mmiowb();
1200 spin_unlock_irqrestore(&host->lock, flags);
1201
1202 mmc_request_done(host->mmc, mrq);
1203 }
1204
1205 static void sdhci_timeout_timer(unsigned long data)
1206 {
1207 struct sdhci_host *host;
1208 unsigned long flags;
1209
1210 host = (struct sdhci_host*)data;
1211
1212 spin_lock_irqsave(&host->lock, flags);
1213
1214 if (host->mrq) {
1215 printk(KERN_ERR "%s: Timeout waiting for hardware "
1216 "interrupt.\n", mmc_hostname(host->mmc));
1217 sdhci_dumpregs(host);
1218
1219 if (host->data) {
1220 host->data->error = -ETIMEDOUT;
1221 sdhci_finish_data(host);
1222 } else {
1223 if (host->cmd)
1224 host->cmd->error = -ETIMEDOUT;
1225 else
1226 host->mrq->cmd->error = -ETIMEDOUT;
1227
1228 tasklet_schedule(&host->finish_tasklet);
1229 }
1230 }
1231
1232 mmiowb();
1233 spin_unlock_irqrestore(&host->lock, flags);
1234 }
1235
1236 /*****************************************************************************\
1237 * *
1238 * Interrupt handling *
1239 * *
1240 \*****************************************************************************/
1241
1242 static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask)
1243 {
1244 BUG_ON(intmask == 0);
1245
1246 if (!host->cmd) {
1247 printk(KERN_ERR "%s: Got command interrupt 0x%08x even "
1248 "though no command operation was in progress.\n",
1249 mmc_hostname(host->mmc), (unsigned)intmask);
1250 sdhci_dumpregs(host);
1251 return;
1252 }
1253
1254 if (intmask & SDHCI_INT_TIMEOUT)
1255 host->cmd->error = -ETIMEDOUT;
1256 else if (intmask & (SDHCI_INT_CRC | SDHCI_INT_END_BIT |
1257 SDHCI_INT_INDEX))
1258 host->cmd->error = -EILSEQ;
1259
1260 if (host->cmd->error)
1261 tasklet_schedule(&host->finish_tasklet);
1262 else if (intmask & SDHCI_INT_RESPONSE)
1263 sdhci_finish_command(host);
1264 }
1265
1266 static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
1267 {
1268 BUG_ON(intmask == 0);
1269
1270 if (!host->data) {
1271 /*
1272 * A data end interrupt is sent together with the response
1273 * for the stop command.
1274 */
1275 if (intmask & SDHCI_INT_DATA_END)
1276 return;
1277
1278 printk(KERN_ERR "%s: Got data interrupt 0x%08x even "
1279 "though no data operation was in progress.\n",
1280 mmc_hostname(host->mmc), (unsigned)intmask);
1281 sdhci_dumpregs(host);
1282
1283 return;
1284 }
1285
1286 if (intmask & SDHCI_INT_DATA_TIMEOUT)
1287 host->data->error = -ETIMEDOUT;
1288 else if (intmask & (SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_END_BIT))
1289 host->data->error = -EILSEQ;
1290 else if (intmask & SDHCI_INT_ADMA_ERROR)
1291 host->data->error = -EIO;
1292
1293 if (host->data->error)
1294 sdhci_finish_data(host);
1295 else {
1296 if (intmask & (SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL))
1297 sdhci_transfer_pio(host);
1298
1299 /*
1300 * We currently don't do anything fancy with DMA
1301 * boundaries, but as we can't disable the feature
1302 * we need to at least restart the transfer.
1303 */
1304 if (intmask & SDHCI_INT_DMA_END)
1305 writel(readl(host->ioaddr + SDHCI_DMA_ADDRESS),
1306 host->ioaddr + SDHCI_DMA_ADDRESS);
1307
1308 if (intmask & SDHCI_INT_DATA_END) {
1309 if (host->cmd) {
1310 /*
1311 * Data managed to finish before the
1312 * command completed. Make sure we do
1313 * things in the proper order.
1314 */
1315 host->data_early = 1;
1316 } else {
1317 sdhci_finish_data(host);
1318 }
1319 }
1320 }
1321 }
1322
1323 static irqreturn_t sdhci_irq(int irq, void *dev_id)
1324 {
1325 irqreturn_t result;
1326 struct sdhci_host* host = dev_id;
1327 u32 intmask;
1328 int cardint = 0;
1329
1330 spin_lock(&host->lock);
1331
1332 intmask = readl(host->ioaddr + SDHCI_INT_STATUS);
1333
1334 if (!intmask || intmask == 0xffffffff) {
1335 result = IRQ_NONE;
1336 goto out;
1337 }
1338
1339 DBG("*** %s got interrupt: 0x%08x\n",
1340 mmc_hostname(host->mmc), intmask);
1341
1342 if (intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
1343 writel(intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE),
1344 host->ioaddr + SDHCI_INT_STATUS);
1345 tasklet_schedule(&host->card_tasklet);
1346 }
1347
1348 intmask &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE);
1349
1350 if (intmask & SDHCI_INT_CMD_MASK) {
1351 writel(intmask & SDHCI_INT_CMD_MASK,
1352 host->ioaddr + SDHCI_INT_STATUS);
1353 sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK);
1354 }
1355
1356 if (intmask & SDHCI_INT_DATA_MASK) {
1357 writel(intmask & SDHCI_INT_DATA_MASK,
1358 host->ioaddr + SDHCI_INT_STATUS);
1359 sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK);
1360 }
1361
1362 intmask &= ~(SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK);
1363
1364 intmask &= ~SDHCI_INT_ERROR;
1365
1366 if (intmask & SDHCI_INT_BUS_POWER) {
1367 printk(KERN_ERR "%s: Card is consuming too much power!\n",
1368 mmc_hostname(host->mmc));
1369 writel(SDHCI_INT_BUS_POWER, host->ioaddr + SDHCI_INT_STATUS);
1370 }
1371
1372 intmask &= ~SDHCI_INT_BUS_POWER;
1373
1374 if (intmask & SDHCI_INT_CARD_INT)
1375 cardint = 1;
1376
1377 intmask &= ~SDHCI_INT_CARD_INT;
1378
1379 if (intmask) {
1380 printk(KERN_ERR "%s: Unexpected interrupt 0x%08x.\n",
1381 mmc_hostname(host->mmc), intmask);
1382 sdhci_dumpregs(host);
1383
1384 writel(intmask, host->ioaddr + SDHCI_INT_STATUS);
1385 }
1386
1387 result = IRQ_HANDLED;
1388
1389 mmiowb();
1390 out:
1391 spin_unlock(&host->lock);
1392
1393 /*
1394 * We have to delay this as it calls back into the driver.
1395 */
1396 if (cardint)
1397 mmc_signal_sdio_irq(host->mmc);
1398
1399 return result;
1400 }
1401
1402 /*****************************************************************************\
1403 * *
1404 * Suspend/resume *
1405 * *
1406 \*****************************************************************************/
1407
1408 #ifdef CONFIG_PM
1409
1410 int sdhci_suspend_host(struct sdhci_host *host, pm_message_t state)
1411 {
1412 int ret;
1413
1414 ret = mmc_suspend_host(host->mmc, state);
1415 if (ret)
1416 return ret;
1417
1418 free_irq(host->irq, host);
1419
1420 return 0;
1421 }
1422
1423 EXPORT_SYMBOL_GPL(sdhci_suspend_host);
1424
1425 int sdhci_resume_host(struct sdhci_host *host)
1426 {
1427 int ret;
1428
1429 if (host->flags & SDHCI_USE_DMA) {
1430 if (host->ops->enable_dma)
1431 host->ops->enable_dma(host);
1432 }
1433
1434 ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED,
1435 mmc_hostname(host->mmc), host);
1436 if (ret)
1437 return ret;
1438
1439 sdhci_init(host);
1440 mmiowb();
1441
1442 ret = mmc_resume_host(host->mmc);
1443 if (ret)
1444 return ret;
1445
1446 return 0;
1447 }
1448
1449 EXPORT_SYMBOL_GPL(sdhci_resume_host);
1450
1451 #endif /* CONFIG_PM */
1452
1453 /*****************************************************************************\
1454 * *
1455 * Device allocation/registration *
1456 * *
1457 \*****************************************************************************/
1458
1459 struct sdhci_host *sdhci_alloc_host(struct device *dev,
1460 size_t priv_size)
1461 {
1462 struct mmc_host *mmc;
1463 struct sdhci_host *host;
1464
1465 WARN_ON(dev == NULL);
1466
1467 mmc = mmc_alloc_host(sizeof(struct sdhci_host) + priv_size, dev);
1468 if (!mmc)
1469 return ERR_PTR(-ENOMEM);
1470
1471 host = mmc_priv(mmc);
1472 host->mmc = mmc;
1473
1474 return host;
1475 }
1476
1477 EXPORT_SYMBOL_GPL(sdhci_alloc_host);
1478
1479 int sdhci_add_host(struct sdhci_host *host)
1480 {
1481 struct mmc_host *mmc;
1482 unsigned int caps;
1483 int ret;
1484
1485 WARN_ON(host == NULL);
1486 if (host == NULL)
1487 return -EINVAL;
1488
1489 mmc = host->mmc;
1490
1491 if (debug_quirks)
1492 host->quirks = debug_quirks;
1493
1494 sdhci_reset(host, SDHCI_RESET_ALL);
1495
1496 host->version = readw(host->ioaddr + SDHCI_HOST_VERSION);
1497 host->version = (host->version & SDHCI_SPEC_VER_MASK)
1498 >> SDHCI_SPEC_VER_SHIFT;
1499 if (host->version > SDHCI_SPEC_200) {
1500 printk(KERN_ERR "%s: Unknown controller version (%d). "
1501 "You may experience problems.\n", mmc_hostname(mmc),
1502 host->version);
1503 }
1504
1505 caps = readl(host->ioaddr + SDHCI_CAPABILITIES);
1506
1507 if (host->quirks & SDHCI_QUIRK_FORCE_DMA)
1508 host->flags |= SDHCI_USE_DMA;
1509 else if (!(caps & SDHCI_CAN_DO_DMA))
1510 DBG("Controller doesn't have DMA capability\n");
1511 else
1512 host->flags |= SDHCI_USE_DMA;
1513
1514 if ((host->quirks & SDHCI_QUIRK_BROKEN_DMA) &&
1515 (host->flags & SDHCI_USE_DMA)) {
1516 DBG("Disabling DMA as it is marked broken\n");
1517 host->flags &= ~SDHCI_USE_DMA;
1518 }
1519
1520 if (host->flags & SDHCI_USE_DMA) {
1521 if ((host->version >= SDHCI_SPEC_200) &&
1522 (caps & SDHCI_CAN_DO_ADMA2))
1523 host->flags |= SDHCI_USE_ADMA;
1524 }
1525
1526 if ((host->quirks & SDHCI_QUIRK_BROKEN_ADMA) &&
1527 (host->flags & SDHCI_USE_ADMA)) {
1528 DBG("Disabling ADMA as it is marked broken\n");
1529 host->flags &= ~SDHCI_USE_ADMA;
1530 }
1531
1532 if (host->flags & SDHCI_USE_DMA) {
1533 if (host->ops->enable_dma) {
1534 if (host->ops->enable_dma(host)) {
1535 printk(KERN_WARNING "%s: No suitable DMA "
1536 "available. Falling back to PIO.\n",
1537 mmc_hostname(mmc));
1538 host->flags &= ~(SDHCI_USE_DMA | SDHCI_USE_ADMA);
1539 }
1540 }
1541 }
1542
1543 if (host->flags & SDHCI_USE_ADMA) {
1544 /*
1545 * We need to allocate descriptors for all sg entries
1546 * (128) and potentially one alignment transfer for
1547 * each of those entries.
1548 */
1549 host->adma_desc = kmalloc((128 * 2 + 1) * 4, GFP_KERNEL);
1550 host->align_buffer = kmalloc(128 * 4, GFP_KERNEL);
1551 if (!host->adma_desc || !host->align_buffer) {
1552 kfree(host->adma_desc);
1553 kfree(host->align_buffer);
1554 printk(KERN_WARNING "%s: Unable to allocate ADMA "
1555 "buffers. Falling back to standard DMA.\n",
1556 mmc_hostname(mmc));
1557 host->flags &= ~SDHCI_USE_ADMA;
1558 }
1559 }
1560
1561 /*
1562 * If we use DMA, then it's up to the caller to set the DMA
1563 * mask, but PIO does not need the hw shim so we set a new
1564 * mask here in that case.
1565 */
1566 if (!(host->flags & SDHCI_USE_DMA)) {
1567 host->dma_mask = DMA_BIT_MASK(64);
1568 mmc_dev(host->mmc)->dma_mask = &host->dma_mask;
1569 }
1570
1571 host->max_clk =
1572 (caps & SDHCI_CLOCK_BASE_MASK) >> SDHCI_CLOCK_BASE_SHIFT;
1573 if (host->max_clk == 0) {
1574 printk(KERN_ERR "%s: Hardware doesn't specify base clock "
1575 "frequency.\n", mmc_hostname(mmc));
1576 return -ENODEV;
1577 }
1578 host->max_clk *= 1000000;
1579
1580 host->timeout_clk =
1581 (caps & SDHCI_TIMEOUT_CLK_MASK) >> SDHCI_TIMEOUT_CLK_SHIFT;
1582 if (host->timeout_clk == 0) {
1583 printk(KERN_ERR "%s: Hardware doesn't specify timeout clock "
1584 "frequency.\n", mmc_hostname(mmc));
1585 return -ENODEV;
1586 }
1587 if (caps & SDHCI_TIMEOUT_CLK_UNIT)
1588 host->timeout_clk *= 1000;
1589
1590 /*
1591 * Set host parameters.
1592 */
1593 mmc->ops = &sdhci_ops;
1594 mmc->f_min = host->max_clk / 256;
1595 mmc->f_max = host->max_clk;
1596 mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ;
1597
1598 if (caps & SDHCI_CAN_DO_HISPD)
1599 mmc->caps |= MMC_CAP_SD_HIGHSPEED;
1600
1601 mmc->ocr_avail = 0;
1602 if (caps & SDHCI_CAN_VDD_330)
1603 mmc->ocr_avail |= MMC_VDD_32_33|MMC_VDD_33_34;
1604 if (caps & SDHCI_CAN_VDD_300)
1605 mmc->ocr_avail |= MMC_VDD_29_30|MMC_VDD_30_31;
1606 if (caps & SDHCI_CAN_VDD_180)
1607 mmc->ocr_avail |= MMC_VDD_165_195;
1608
1609 if (mmc->ocr_avail == 0) {
1610 printk(KERN_ERR "%s: Hardware doesn't report any "
1611 "support voltages.\n", mmc_hostname(mmc));
1612 return -ENODEV;
1613 }
1614
1615 spin_lock_init(&host->lock);
1616
1617 /*
1618 * Maximum number of segments. Depends on if the hardware
1619 * can do scatter/gather or not.
1620 */
1621 if (host->flags & SDHCI_USE_ADMA)
1622 mmc->max_hw_segs = 128;
1623 else if (host->flags & SDHCI_USE_DMA)
1624 mmc->max_hw_segs = 1;
1625 else /* PIO */
1626 mmc->max_hw_segs = 128;
1627 mmc->max_phys_segs = 128;
1628
1629 /*
1630 * Maximum number of sectors in one transfer. Limited by DMA boundary
1631 * size (512KiB).
1632 */
1633 mmc->max_req_size = 524288;
1634
1635 /*
1636 * Maximum segment size. Could be one segment with the maximum number
1637 * of bytes. When doing hardware scatter/gather, each entry cannot
1638 * be larger than 64 KiB though.
1639 */
1640 if (host->flags & SDHCI_USE_ADMA)
1641 mmc->max_seg_size = 65536;
1642 else
1643 mmc->max_seg_size = mmc->max_req_size;
1644
1645 /*
1646 * Maximum block size. This varies from controller to controller and
1647 * is specified in the capabilities register.
1648 */
1649 mmc->max_blk_size = (caps & SDHCI_MAX_BLOCK_MASK) >> SDHCI_MAX_BLOCK_SHIFT;
1650 if (mmc->max_blk_size >= 3) {
1651 printk(KERN_WARNING "%s: Invalid maximum block size, "
1652 "assuming 512 bytes\n", mmc_hostname(mmc));
1653 mmc->max_blk_size = 512;
1654 } else
1655 mmc->max_blk_size = 512 << mmc->max_blk_size;
1656
1657 /*
1658 * Maximum block count.
1659 */
1660 mmc->max_blk_count = 65535;
1661
1662 /*
1663 * Init tasklets.
1664 */
1665 tasklet_init(&host->card_tasklet,
1666 sdhci_tasklet_card, (unsigned long)host);
1667 tasklet_init(&host->finish_tasklet,
1668 sdhci_tasklet_finish, (unsigned long)host);
1669
1670 setup_timer(&host->timer, sdhci_timeout_timer, (unsigned long)host);
1671
1672 ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED,
1673 mmc_hostname(mmc), host);
1674 if (ret)
1675 goto untasklet;
1676
1677 sdhci_init(host);
1678
1679 #ifdef CONFIG_MMC_DEBUG
1680 sdhci_dumpregs(host);
1681 #endif
1682
1683 #ifdef CONFIG_LEDS_CLASS
1684 host->led.name = mmc_hostname(mmc);
1685 host->led.brightness = LED_OFF;
1686 host->led.default_trigger = mmc_hostname(mmc);
1687 host->led.brightness_set = sdhci_led_control;
1688
1689 ret = led_classdev_register(mmc_dev(mmc), &host->led);
1690 if (ret)
1691 goto reset;
1692 #endif
1693
1694 mmiowb();
1695
1696 mmc_add_host(mmc);
1697
1698 printk(KERN_INFO "%s: SDHCI controller on %s [%s] using %s%s\n",
1699 mmc_hostname(mmc), host->hw_name, mmc_dev(mmc)->bus_id,
1700 (host->flags & SDHCI_USE_ADMA)?"A":"",
1701 (host->flags & SDHCI_USE_DMA)?"DMA":"PIO");
1702
1703 return 0;
1704
1705 #ifdef CONFIG_LEDS_CLASS
1706 reset:
1707 sdhci_reset(host, SDHCI_RESET_ALL);
1708 free_irq(host->irq, host);
1709 #endif
1710 untasklet:
1711 tasklet_kill(&host->card_tasklet);
1712 tasklet_kill(&host->finish_tasklet);
1713
1714 return ret;
1715 }
1716
1717 EXPORT_SYMBOL_GPL(sdhci_add_host);
1718
1719 void sdhci_remove_host(struct sdhci_host *host, int dead)
1720 {
1721 unsigned long flags;
1722
1723 if (dead) {
1724 spin_lock_irqsave(&host->lock, flags);
1725
1726 host->flags |= SDHCI_DEVICE_DEAD;
1727
1728 if (host->mrq) {
1729 printk(KERN_ERR "%s: Controller removed during "
1730 " transfer!\n", mmc_hostname(host->mmc));
1731
1732 host->mrq->cmd->error = -ENOMEDIUM;
1733 tasklet_schedule(&host->finish_tasklet);
1734 }
1735
1736 spin_unlock_irqrestore(&host->lock, flags);
1737 }
1738
1739 mmc_remove_host(host->mmc);
1740
1741 #ifdef CONFIG_LEDS_CLASS
1742 led_classdev_unregister(&host->led);
1743 #endif
1744
1745 if (!dead)
1746 sdhci_reset(host, SDHCI_RESET_ALL);
1747
1748 free_irq(host->irq, host);
1749
1750 del_timer_sync(&host->timer);
1751
1752 tasklet_kill(&host->card_tasklet);
1753 tasklet_kill(&host->finish_tasklet);
1754
1755 kfree(host->adma_desc);
1756 kfree(host->align_buffer);
1757
1758 host->adma_desc = NULL;
1759 host->align_buffer = NULL;
1760 }
1761
1762 EXPORT_SYMBOL_GPL(sdhci_remove_host);
1763
1764 void sdhci_free_host(struct sdhci_host *host)
1765 {
1766 mmc_free_host(host->mmc);
1767 }
1768
1769 EXPORT_SYMBOL_GPL(sdhci_free_host);
1770
1771 /*****************************************************************************\
1772 * *
1773 * Driver init/exit *
1774 * *
1775 \*****************************************************************************/
1776
1777 static int __init sdhci_drv_init(void)
1778 {
1779 printk(KERN_INFO DRIVER_NAME
1780 ": Secure Digital Host Controller Interface driver\n");
1781 printk(KERN_INFO DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
1782
1783 return 0;
1784 }
1785
1786 static void __exit sdhci_drv_exit(void)
1787 {
1788 }
1789
1790 module_init(sdhci_drv_init);
1791 module_exit(sdhci_drv_exit);
1792
1793 module_param(debug_quirks, uint, 0444);
1794
1795 MODULE_AUTHOR("Pierre Ossman <drzeus@drzeus.cx>");
1796 MODULE_DESCRIPTION("Secure Digital Host Controller Interface core driver");
1797 MODULE_LICENSE("GPL");
1798
1799 MODULE_PARM_DESC(debug_quirks, "Force certain quirks.");
Linux kernel - Deliverables
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