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added 2.6.29.6 aldebaran kernel
[nao-ulib.git] / kernel / 2.6.29.6-aldebaran-rt / drivers / mmc / host / sdhci.c
blobaccb592764edb4522a24160eced3db7afca13f4a
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 #if defined(CONFIG_LEDS_CLASS) || (defined(CONFIG_LEDS_CLASS_MODULE) && \
34 defined(CONFIG_MMC_SDHCI_MODULE))
35 #define SDHCI_USE_LEDS_CLASS
36 #endif
37
38 static unsigned int debug_quirks = 0;
39
40 static void sdhci_prepare_data(struct sdhci_host *, struct mmc_data *);
41 static void sdhci_finish_data(struct sdhci_host *);
42
43 static void sdhci_send_command(struct sdhci_host *, struct mmc_command *);
44 static void sdhci_finish_command(struct sdhci_host *);
45
46 static void sdhci_dumpregs(struct sdhci_host *host)
47 {
48 printk(KERN_DEBUG DRIVER_NAME ": ============== REGISTER DUMP ==============\n");
49
50 printk(KERN_DEBUG DRIVER_NAME ": Sys addr: 0x%08x | Version: 0x%08x\n",
51 readl(host->ioaddr + SDHCI_DMA_ADDRESS),
52 readw(host->ioaddr + SDHCI_HOST_VERSION));
53 printk(KERN_DEBUG DRIVER_NAME ": Blk size: 0x%08x | Blk cnt: 0x%08x\n",
54 readw(host->ioaddr + SDHCI_BLOCK_SIZE),
55 readw(host->ioaddr + SDHCI_BLOCK_COUNT));
56 printk(KERN_DEBUG DRIVER_NAME ": Argument: 0x%08x | Trn mode: 0x%08x\n",
57 readl(host->ioaddr + SDHCI_ARGUMENT),
58 readw(host->ioaddr + SDHCI_TRANSFER_MODE));
59 printk(KERN_DEBUG DRIVER_NAME ": Present: 0x%08x | Host ctl: 0x%08x\n",
60 readl(host->ioaddr + SDHCI_PRESENT_STATE),
61 readb(host->ioaddr + SDHCI_HOST_CONTROL));
62 printk(KERN_DEBUG DRIVER_NAME ": Power: 0x%08x | Blk gap: 0x%08x\n",
63 readb(host->ioaddr + SDHCI_POWER_CONTROL),
64 readb(host->ioaddr + SDHCI_BLOCK_GAP_CONTROL));
65 printk(KERN_DEBUG DRIVER_NAME ": Wake-up: 0x%08x | Clock: 0x%08x\n",
66 readb(host->ioaddr + SDHCI_WAKE_UP_CONTROL),
67 readw(host->ioaddr + SDHCI_CLOCK_CONTROL));
68 printk(KERN_DEBUG DRIVER_NAME ": Timeout: 0x%08x | Int stat: 0x%08x\n",
69 readb(host->ioaddr + SDHCI_TIMEOUT_CONTROL),
70 readl(host->ioaddr + SDHCI_INT_STATUS));
71 printk(KERN_DEBUG DRIVER_NAME ": Int enab: 0x%08x | Sig enab: 0x%08x\n",
72 readl(host->ioaddr + SDHCI_INT_ENABLE),
73 readl(host->ioaddr + SDHCI_SIGNAL_ENABLE));
74 printk(KERN_DEBUG DRIVER_NAME ": AC12 err: 0x%08x | Slot int: 0x%08x\n",
75 readw(host->ioaddr + SDHCI_ACMD12_ERR),
76 readw(host->ioaddr + SDHCI_SLOT_INT_STATUS));
77 printk(KERN_DEBUG DRIVER_NAME ": Caps: 0x%08x | Max curr: 0x%08x\n",
78 readl(host->ioaddr + SDHCI_CAPABILITIES),
79 readl(host->ioaddr + SDHCI_MAX_CURRENT));
80
81 printk(KERN_DEBUG DRIVER_NAME ": ===========================================\n");
82 }
83
84 /*****************************************************************************\
85 * *
86 * Low level functions *
87 * *
88 \*****************************************************************************/
89
90 static void sdhci_reset(struct sdhci_host *host, u8 mask)
91 {
92 unsigned long timeout;
93
94 if (host->quirks & SDHCI_QUIRK_NO_CARD_NO_RESET) {
95 if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) &
96 SDHCI_CARD_PRESENT))
97 return;
98 }
99
100 writeb(mask, host->ioaddr + SDHCI_SOFTWARE_RESET);
101
102 if (mask & SDHCI_RESET_ALL)
103 host->clock = 0;
104
105 /* Wait max 100 ms */
106 timeout = 100;
107
108 /* hw clears the bit when it's done */
109 while (readb(host->ioaddr + SDHCI_SOFTWARE_RESET) & mask) {
110 if (timeout == 0) {
111 printk(KERN_ERR "%s: Reset 0x%x never completed.\n",
112 mmc_hostname(host->mmc), (int)mask);
113 sdhci_dumpregs(host);
114 return;
115 }
116 timeout--;
117 mdelay(1);
118 }
119 }
120
121 static void sdhci_init(struct sdhci_host *host)
122 {
123 u32 intmask;
124
125 sdhci_reset(host, SDHCI_RESET_ALL);
126
127 intmask = SDHCI_INT_BUS_POWER | SDHCI_INT_DATA_END_BIT |
128 SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_TIMEOUT | SDHCI_INT_INDEX |
129 SDHCI_INT_END_BIT | SDHCI_INT_CRC | SDHCI_INT_TIMEOUT |
130 SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT |
131 SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL |
132 SDHCI_INT_DMA_END | SDHCI_INT_DATA_END | SDHCI_INT_RESPONSE |
133 SDHCI_INT_ADMA_ERROR;
134
135 writel(intmask, host->ioaddr + SDHCI_INT_ENABLE);
136 writel(intmask, host->ioaddr + SDHCI_SIGNAL_ENABLE);
137 }
138
139 static void sdhci_activate_led(struct sdhci_host *host)
140 {
141 u8 ctrl;
142
143 ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
144 ctrl |= SDHCI_CTRL_LED;
145 writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
146 }
147
148 static void sdhci_deactivate_led(struct sdhci_host *host)
149 {
150 u8 ctrl;
151
152 ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
153 ctrl &= ~SDHCI_CTRL_LED;
154 writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
155 }
156
157 #ifdef SDHCI_USE_LEDS_CLASS
158 static void sdhci_led_control(struct led_classdev *led,
159 enum led_brightness brightness)
160 {
161 struct sdhci_host *host = container_of(led, struct sdhci_host, led);
162 unsigned long flags;
163
164 spin_lock_irqsave(&host->lock, flags);
165
166 if (brightness == LED_OFF)
167 sdhci_deactivate_led(host);
168 else
169 sdhci_activate_led(host);
170
171 spin_unlock_irqrestore(&host->lock, flags);
172 }
173 #endif
174
175 /*****************************************************************************\
176 * *
177 * Core functions *
178 * *
179 \*****************************************************************************/
180
181 static void sdhci_read_block_pio(struct sdhci_host *host)
182 {
183 unsigned long flags;
184 size_t blksize, len, chunk;
185 u32 uninitialized_var(scratch);
186 u8 *buf;
187
188 DBG("PIO reading\n");
189
190 blksize = host->data->blksz;
191 chunk = 0;
192
193 local_irq_save(flags);
194
195 while (blksize) {
196 if (!sg_miter_next(&host->sg_miter))
197 BUG();
198
199 len = min(host->sg_miter.length, blksize);
200
201 blksize -= len;
202 host->sg_miter.consumed = len;
203
204 buf = host->sg_miter.addr;
205
206 while (len) {
207 if (chunk == 0) {
208 scratch = readl(host->ioaddr + SDHCI_BUFFER);
209 chunk = 4;
210 }
211
212 *buf = scratch & 0xFF;
213
214 buf++;
215 scratch >>= 8;
216 chunk--;
217 len--;
218 }
219 }
220
221 sg_miter_stop(&host->sg_miter);
222
223 local_irq_restore(flags);
224 }
225
226 static void sdhci_write_block_pio(struct sdhci_host *host)
227 {
228 unsigned long flags;
229 size_t blksize, len, chunk;
230 u32 scratch;
231 u8 *buf;
232
233 DBG("PIO writing\n");
234
235 blksize = host->data->blksz;
236 chunk = 0;
237 scratch = 0;
238
239 local_irq_save(flags);
240
241 while (blksize) {
242 if (!sg_miter_next(&host->sg_miter))
243 BUG();
244
245 len = min(host->sg_miter.length, blksize);
246
247 blksize -= len;
248 host->sg_miter.consumed = len;
249
250 buf = host->sg_miter.addr;
251
252 while (len) {
253 scratch |= (u32)*buf << (chunk * 8);
254
255 buf++;
256 chunk++;
257 len--;
258
259 if ((chunk == 4) || ((len == 0) && (blksize == 0))) {
260 writel(scratch, host->ioaddr + SDHCI_BUFFER);
261 chunk = 0;
262 scratch = 0;
263 }
264 }
265 }
266
267 sg_miter_stop(&host->sg_miter);
268
269 local_irq_restore(flags);
270 }
271
272 static void sdhci_transfer_pio(struct sdhci_host *host)
273 {
274 u32 mask;
275
276 BUG_ON(!host->data);
277
278 if (host->blocks == 0)
279 return;
280
281 if (host->data->flags & MMC_DATA_READ)
282 mask = SDHCI_DATA_AVAILABLE;
283 else
284 mask = SDHCI_SPACE_AVAILABLE;
285
286 /*
287 * Some controllers (JMicron JMB38x) mess up the buffer bits
288 * for transfers < 4 bytes. As long as it is just one block,
289 * we can ignore the bits.
290 */
291 if ((host->quirks & SDHCI_QUIRK_BROKEN_SMALL_PIO) &&
292 (host->data->blocks == 1))
293 mask = ~0;
294
295 while (readl(host->ioaddr + SDHCI_PRESENT_STATE) & mask) {
296 if (host->data->flags & MMC_DATA_READ)
297 sdhci_read_block_pio(host);
298 else
299 sdhci_write_block_pio(host);
300
301 host->blocks--;
302 if (host->blocks == 0)
303 break;
304 }
305
306 DBG("PIO transfer complete.\n");
307 }
308
309 static char *sdhci_kmap_atomic(struct scatterlist *sg, unsigned long *flags)
310 {
311 local_irq_save(*flags);
312 return kmap_atomic(sg_page(sg), KM_BIO_SRC_IRQ) + sg->offset;
313 }
314
315 static void sdhci_kunmap_atomic(void *buffer, unsigned long *flags)
316 {
317 kunmap_atomic(buffer, KM_BIO_SRC_IRQ);
318 local_irq_restore(*flags);
319 }
320
321 static int sdhci_adma_table_pre(struct sdhci_host *host,
322 struct mmc_data *data)
323 {
324 int direction;
325
326 u8 *desc;
327 u8 *align;
328 dma_addr_t addr;
329 dma_addr_t align_addr;
330 int len, offset;
331
332 struct scatterlist *sg;
333 int i;
334 char *buffer;
335 unsigned long flags;
336
337 /*
338 * The spec does not specify endianness of descriptor table.
339 * We currently guess that it is LE.
340 */
341
342 if (data->flags & MMC_DATA_READ)
343 direction = DMA_FROM_DEVICE;
344 else
345 direction = DMA_TO_DEVICE;
346
347 /*
348 * The ADMA descriptor table is mapped further down as we
349 * need to fill it with data first.
350 */
351
352 host->align_addr = dma_map_single(mmc_dev(host->mmc),
353 host->align_buffer, 128 * 4, direction);
354 if (dma_mapping_error(mmc_dev(host->mmc), host->align_addr))
355 goto fail;
356 BUG_ON(host->align_addr & 0x3);
357
358 host->sg_count = dma_map_sg(mmc_dev(host->mmc),
359 data->sg, data->sg_len, direction);
360 if (host->sg_count == 0)
361 goto unmap_align;
362
363 desc = host->adma_desc;
364 align = host->align_buffer;
365
366 align_addr = host->align_addr;
367
368 for_each_sg(data->sg, sg, host->sg_count, i) {
369 addr = sg_dma_address(sg);
370 len = sg_dma_len(sg);
371
372 /*
373 * The SDHCI specification states that ADMA
374 * addresses must be 32-bit aligned. If they
375 * aren't, then we use a bounce buffer for
376 * the (up to three) bytes that screw up the
377 * alignment.
378 */
379 offset = (4 - (addr & 0x3)) & 0x3;
380 if (offset) {
381 if (data->flags & MMC_DATA_WRITE) {
382 buffer = sdhci_kmap_atomic(sg, &flags);
383 WARN_ON(((long)buffer & PAGE_MASK) > (PAGE_SIZE - 3));
384 memcpy(align, buffer, offset);
385 sdhci_kunmap_atomic(buffer, &flags);
386 }
387
388 desc[7] = (align_addr >> 24) & 0xff;
389 desc[6] = (align_addr >> 16) & 0xff;
390 desc[5] = (align_addr >> 8) & 0xff;
391 desc[4] = (align_addr >> 0) & 0xff;
392
393 BUG_ON(offset > 65536);
394
395 desc[3] = (offset >> 8) & 0xff;
396 desc[2] = (offset >> 0) & 0xff;
397
398 desc[1] = 0x00;
399 desc[0] = 0x21; /* tran, valid */
400
401 align += 4;
402 align_addr += 4;
403
404 desc += 8;
405
406 addr += offset;
407 len -= offset;
408 }
409
410 desc[7] = (addr >> 24) & 0xff;
411 desc[6] = (addr >> 16) & 0xff;
412 desc[5] = (addr >> 8) & 0xff;
413 desc[4] = (addr >> 0) & 0xff;
414
415 BUG_ON(len > 65536);
416
417 desc[3] = (len >> 8) & 0xff;
418 desc[2] = (len >> 0) & 0xff;
419
420 desc[1] = 0x00;
421 desc[0] = 0x21; /* tran, valid */
422
423 desc += 8;
424
425 /*
426 * If this triggers then we have a calculation bug
427 * somewhere. :/
428 */
429 WARN_ON((desc - host->adma_desc) > (128 * 2 + 1) * 4);
430 }
431
432 /*
433 * Add a terminating entry.
434 */
435 desc[7] = 0;
436 desc[6] = 0;
437 desc[5] = 0;
438 desc[4] = 0;
439
440 desc[3] = 0;
441 desc[2] = 0;
442
443 desc[1] = 0x00;
444 desc[0] = 0x03; /* nop, end, valid */
445
446 /*
447 * Resync align buffer as we might have changed it.
448 */
449 if (data->flags & MMC_DATA_WRITE) {
450 dma_sync_single_for_device(mmc_dev(host->mmc),
451 host->align_addr, 128 * 4, direction);
452 }
453
454 host->adma_addr = dma_map_single(mmc_dev(host->mmc),
455 host->adma_desc, (128 * 2 + 1) * 4, DMA_TO_DEVICE);
456 if (dma_mapping_error(mmc_dev(host->mmc), host->adma_addr))
457 goto unmap_entries;
458 BUG_ON(host->adma_addr & 0x3);
459
460 return 0;
461
462 unmap_entries:
463 dma_unmap_sg(mmc_dev(host->mmc), data->sg,
464 data->sg_len, direction);
465 unmap_align:
466 dma_unmap_single(mmc_dev(host->mmc), host->align_addr,
467 128 * 4, direction);
468 fail:
469 return -EINVAL;
470 }
471
472 static void sdhci_adma_table_post(struct sdhci_host *host,
473 struct mmc_data *data)
474 {
475 int direction;
476
477 struct scatterlist *sg;
478 int i, size;
479 u8 *align;
480 char *buffer;
481 unsigned long flags;
482
483 if (data->flags & MMC_DATA_READ)
484 direction = DMA_FROM_DEVICE;
485 else
486 direction = DMA_TO_DEVICE;
487
488 dma_unmap_single(mmc_dev(host->mmc), host->adma_addr,
489 (128 * 2 + 1) * 4, DMA_TO_DEVICE);
490
491 dma_unmap_single(mmc_dev(host->mmc), host->align_addr,
492 128 * 4, direction);
493
494 if (data->flags & MMC_DATA_READ) {
495 dma_sync_sg_for_cpu(mmc_dev(host->mmc), data->sg,
496 data->sg_len, direction);
497
498 align = host->align_buffer;
499
500 for_each_sg(data->sg, sg, host->sg_count, i) {
501 if (sg_dma_address(sg) & 0x3) {
502 size = 4 - (sg_dma_address(sg) & 0x3);
503
504 buffer = sdhci_kmap_atomic(sg, &flags);
505 WARN_ON(((long)buffer & PAGE_MASK) > (PAGE_SIZE - 3));
506 memcpy(buffer, align, size);
507 sdhci_kunmap_atomic(buffer, &flags);
508
509 align += 4;
510 }
511 }
512 }
513
514 dma_unmap_sg(mmc_dev(host->mmc), data->sg,
515 data->sg_len, direction);
516 }
517
518 static u8 sdhci_calc_timeout(struct sdhci_host *host, struct mmc_data *data)
519 {
520 u8 count;
521 unsigned target_timeout, current_timeout;
522
523 /*
524 * If the host controller provides us with an incorrect timeout
525 * value, just skip the check and use 0xE. The hardware may take
526 * longer to time out, but that's much better than having a too-short
527 * timeout value.
528 */
529 if ((host->quirks & SDHCI_QUIRK_BROKEN_TIMEOUT_VAL))
530 return 0xE;
531
532 /* timeout in us */
533 target_timeout = data->timeout_ns / 1000 +
534 data->timeout_clks / host->clock;
535
536 /*
537 * Figure out needed cycles.
538 * We do this in steps in order to fit inside a 32 bit int.
539 * The first step is the minimum timeout, which will have a
540 * minimum resolution of 6 bits:
541 * (1) 2^13*1000 > 2^22,
542 * (2) host->timeout_clk < 2^16
543 * =>
544 * (1) / (2) > 2^6
545 */
546 count = 0;
547 current_timeout = (1 << 13) * 1000 / host->timeout_clk;
548 while (current_timeout < target_timeout) {
549 count++;
550 current_timeout <<= 1;
551 if (count >= 0xF)
552 break;
553 }
554
555 if (count >= 0xF) {
556 printk(KERN_WARNING "%s: Too large timeout requested!\n",
557 mmc_hostname(host->mmc));
558 count = 0xE;
559 }
560
561 return count;
562 }
563
564 static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_data *data)
565 {
566 u8 count;
567 u8 ctrl;
568 int ret;
569
570 WARN_ON(host->data);
571
572 if (data == NULL)
573 return;
574
575 /* Sanity checks */
576 BUG_ON(data->blksz * data->blocks > 524288);
577 BUG_ON(data->blksz > host->mmc->max_blk_size);
578 BUG_ON(data->blocks > 65535);
579
580 host->data = data;
581 host->data_early = 0;
582
583 count = sdhci_calc_timeout(host, data);
584 writeb(count, host->ioaddr + SDHCI_TIMEOUT_CONTROL);
585
586 if (host->flags & SDHCI_USE_DMA)
587 host->flags |= SDHCI_REQ_USE_DMA;
588
589 /*
590 * FIXME: This doesn't account for merging when mapping the
591 * scatterlist.
592 */
593 if (host->flags & SDHCI_REQ_USE_DMA) {
594 int broken, i;
595 struct scatterlist *sg;
596
597 broken = 0;
598 if (host->flags & SDHCI_USE_ADMA) {
599 if (host->quirks & SDHCI_QUIRK_32BIT_ADMA_SIZE)
600 broken = 1;
601 } else {
602 if (host->quirks & SDHCI_QUIRK_32BIT_DMA_SIZE)
603 broken = 1;
604 }
605
606 if (unlikely(broken)) {
607 for_each_sg(data->sg, sg, data->sg_len, i) {
608 if (sg->length & 0x3) {
609 DBG("Reverting to PIO because of "
610 "transfer size (%d)\n",
611 sg->length);
612 host->flags &= ~SDHCI_REQ_USE_DMA;
613 break;
614 }
615 }
616 }
617 }
618
619 /*
620 * The assumption here being that alignment is the same after
621 * translation to device address space.
622 */
623 if (host->flags & SDHCI_REQ_USE_DMA) {
624 int broken, i;
625 struct scatterlist *sg;
626
627 broken = 0;
628 if (host->flags & SDHCI_USE_ADMA) {
629 /*
630 * As we use 3 byte chunks to work around
631 * alignment problems, we need to check this
632 * quirk.
633 */
634 if (host->quirks & SDHCI_QUIRK_32BIT_ADMA_SIZE)
635 broken = 1;
636 } else {
637 if (host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR)
638 broken = 1;
639 }
640
641 if (unlikely(broken)) {
642 for_each_sg(data->sg, sg, data->sg_len, i) {
643 if (sg->offset & 0x3) {
644 DBG("Reverting to PIO because of "
645 "bad alignment\n");
646 host->flags &= ~SDHCI_REQ_USE_DMA;
647 break;
648 }
649 }
650 }
651 }
652
653 if (host->flags & SDHCI_REQ_USE_DMA) {
654 if (host->flags & SDHCI_USE_ADMA) {
655 ret = sdhci_adma_table_pre(host, data);
656 if (ret) {
657 /*
658 * This only happens when someone fed
659 * us an invalid request.
660 */
661 WARN_ON(1);
662 host->flags &= ~SDHCI_REQ_USE_DMA;
663 } else {
664 writel(host->adma_addr,
665 host->ioaddr + SDHCI_ADMA_ADDRESS);
666 }
667 } else {
668 int sg_cnt;
669
670 sg_cnt = dma_map_sg(mmc_dev(host->mmc),
671 data->sg, data->sg_len,
672 (data->flags & MMC_DATA_READ) ?
673 DMA_FROM_DEVICE :
674 DMA_TO_DEVICE);
675 if (sg_cnt == 0) {
676 /*
677 * This only happens when someone fed
678 * us an invalid request.
679 */
680 WARN_ON(1);
681 host->flags &= ~SDHCI_REQ_USE_DMA;
682 } else {
683 WARN_ON(sg_cnt != 1);
684 writel(sg_dma_address(data->sg),
685 host->ioaddr + SDHCI_DMA_ADDRESS);
686 }
687 }
688 }
689
690 /*
691 * Always adjust the DMA selection as some controllers
692 * (e.g. JMicron) can't do PIO properly when the selection
693 * is ADMA.
694 */
695 if (host->version >= SDHCI_SPEC_200) {
696 ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
697 ctrl &= ~SDHCI_CTRL_DMA_MASK;
698 if ((host->flags & SDHCI_REQ_USE_DMA) &&
699 (host->flags & SDHCI_USE_ADMA))
700 ctrl |= SDHCI_CTRL_ADMA32;
701 else
702 ctrl |= SDHCI_CTRL_SDMA;
703 writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
704 }
705
706 if (!(host->flags & SDHCI_REQ_USE_DMA)) {
707 sg_miter_start(&host->sg_miter,
708 data->sg, data->sg_len, SG_MITER_ATOMIC);
709 host->blocks = data->blocks;
710 }
711
712 /* We do not handle DMA boundaries, so set it to max (512 KiB) */
713 writew(SDHCI_MAKE_BLKSZ(7, data->blksz),
714 host->ioaddr + SDHCI_BLOCK_SIZE);
715 writew(data->blocks, host->ioaddr + SDHCI_BLOCK_COUNT);
716 }
717
718 static void sdhci_set_transfer_mode(struct sdhci_host *host,
719 struct mmc_data *data)
720 {
721 u16 mode;
722
723 if (data == NULL)
724 return;
725
726 WARN_ON(!host->data);
727
728 mode = SDHCI_TRNS_BLK_CNT_EN;
729 if (data->blocks > 1)
730 mode |= SDHCI_TRNS_MULTI;
731 if (data->flags & MMC_DATA_READ)
732 mode |= SDHCI_TRNS_READ;
733 if (host->flags & SDHCI_REQ_USE_DMA)
734 mode |= SDHCI_TRNS_DMA;
735
736 writew(mode, host->ioaddr + SDHCI_TRANSFER_MODE);
737 }
738
739 static void sdhci_finish_data(struct sdhci_host *host)
740 {
741 struct mmc_data *data;
742
743 BUG_ON(!host->data);
744
745 data = host->data;
746 host->data = NULL;
747
748 if (host->flags & SDHCI_REQ_USE_DMA) {
749 if (host->flags & SDHCI_USE_ADMA)
750 sdhci_adma_table_post(host, data);
751 else {
752 dma_unmap_sg(mmc_dev(host->mmc), data->sg,
753 data->sg_len, (data->flags & MMC_DATA_READ) ?
754 DMA_FROM_DEVICE : DMA_TO_DEVICE);
755 }
756 }
757
758 /*
759 * The specification states that the block count register must
760 * be updated, but it does not specify at what point in the
761 * data flow. That makes the register entirely useless to read
762 * back so we have to assume that nothing made it to the card
763 * in the event of an error.
764 */
765 if (data->error)
766 data->bytes_xfered = 0;
767 else
768 data->bytes_xfered = data->blksz * data->blocks;
769
770 if (data->stop) {
771 /*
772 * The controller needs a reset of internal state machines
773 * upon error conditions.
774 */
775 if (data->error) {
776 sdhci_reset(host, SDHCI_RESET_CMD);
777 sdhci_reset(host, SDHCI_RESET_DATA);
778 }
779
780 sdhci_send_command(host, data->stop);
781 } else
782 tasklet_schedule(&host->finish_tasklet);
783 }
784
785 static void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
786 {
787 int flags;
788 u32 mask;
789 unsigned long timeout;
790
791 WARN_ON(host->cmd);
792
793 /* Wait max 10 ms */
794 timeout = 10;
795
796 mask = SDHCI_CMD_INHIBIT;
797 if ((cmd->data != NULL) || (cmd->flags & MMC_RSP_BUSY))
798 mask |= SDHCI_DATA_INHIBIT;
799
800 /* We shouldn't wait for data inihibit for stop commands, even
801 though they might use busy signaling */
802 if (host->mrq->data && (cmd == host->mrq->data->stop))
803 mask &= ~SDHCI_DATA_INHIBIT;
804
805 while (readl(host->ioaddr + SDHCI_PRESENT_STATE) & mask) {
806 if (timeout == 0) {
807 printk(KERN_ERR "%s: Controller never released "
808 "inhibit bit(s).\n", mmc_hostname(host->mmc));
809 sdhci_dumpregs(host);
810 cmd->error = -EIO;
811 tasklet_schedule(&host->finish_tasklet);
812 return;
813 }
814 timeout--;
815 mdelay(1);
816 }
817
818 mod_timer(&host->timer, jiffies + 10 * HZ);
819
820 host->cmd = cmd;
821
822 sdhci_prepare_data(host, cmd->data);
823
824 writel(cmd->arg, host->ioaddr + SDHCI_ARGUMENT);
825
826 sdhci_set_transfer_mode(host, cmd->data);
827
828 if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
829 printk(KERN_ERR "%s: Unsupported response type!\n",
830 mmc_hostname(host->mmc));
831 cmd->error = -EINVAL;
832 tasklet_schedule(&host->finish_tasklet);
833 return;
834 }
835
836 if (!(cmd->flags & MMC_RSP_PRESENT))
837 flags = SDHCI_CMD_RESP_NONE;
838 else if (cmd->flags & MMC_RSP_136)
839 flags = SDHCI_CMD_RESP_LONG;
840 else if (cmd->flags & MMC_RSP_BUSY)
841 flags = SDHCI_CMD_RESP_SHORT_BUSY;
842 else
843 flags = SDHCI_CMD_RESP_SHORT;
844
845 if (cmd->flags & MMC_RSP_CRC)
846 flags |= SDHCI_CMD_CRC;
847 if (cmd->flags & MMC_RSP_OPCODE)
848 flags |= SDHCI_CMD_INDEX;
849 if (cmd->data)
850 flags |= SDHCI_CMD_DATA;
851
852 writew(SDHCI_MAKE_CMD(cmd->opcode, flags),
853 host->ioaddr + SDHCI_COMMAND);
854 }
855
856 static void sdhci_finish_command(struct sdhci_host *host)
857 {
858 int i;
859
860 BUG_ON(host->cmd == NULL);
861
862 if (host->cmd->flags & MMC_RSP_PRESENT) {
863 if (host->cmd->flags & MMC_RSP_136) {
864 /* CRC is stripped so we need to do some shifting. */
865 for (i = 0;i < 4;i++) {
866 host->cmd->resp[i] = readl(host->ioaddr +
867 SDHCI_RESPONSE + (3-i)*4) << 8;
868 if (i != 3)
869 host->cmd->resp[i] |=
870 readb(host->ioaddr +
871 SDHCI_RESPONSE + (3-i)*4-1);
872 }
873 } else {
874 host->cmd->resp[0] = readl(host->ioaddr + SDHCI_RESPONSE);
875 }
876 }
877
878 host->cmd->error = 0;
879
880 if (host->data && host->data_early)
881 sdhci_finish_data(host);
882
883 if (!host->cmd->data)
884 tasklet_schedule(&host->finish_tasklet);
885
886 host->cmd = NULL;
887 }
888
889 static void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
890 {
891 int div;
892 u16 clk;
893 unsigned long timeout;
894
895 if (clock == host->clock)
896 return;
897
898 writew(0, host->ioaddr + SDHCI_CLOCK_CONTROL);
899
900 if (clock == 0)
901 goto out;
902
903 for (div = 1;div < 256;div *= 2) {
904 if ((host->max_clk / div) <= clock)
905 break;
906 }
907 div >>= 1;
908
909 clk = div << SDHCI_DIVIDER_SHIFT;
910 clk |= SDHCI_CLOCK_INT_EN;
911 writew(clk, host->ioaddr + SDHCI_CLOCK_CONTROL);
912
913 /* Wait max 10 ms */
914 timeout = 10;
915 while (!((clk = readw(host->ioaddr + SDHCI_CLOCK_CONTROL))
916 & SDHCI_CLOCK_INT_STABLE)) {
917 if (timeout == 0) {
918 printk(KERN_ERR "%s: Internal clock never "
919 "stabilised.\n", mmc_hostname(host->mmc));
920 sdhci_dumpregs(host);
921 return;
922 }
923 timeout--;
924 mdelay(1);
925 }
926
927 clk |= SDHCI_CLOCK_CARD_EN;
928 writew(clk, host->ioaddr + SDHCI_CLOCK_CONTROL);
929
930 out:
931 host->clock = clock;
932 }
933
934 static void sdhci_set_power(struct sdhci_host *host, unsigned short power)
935 {
936 u8 pwr;
937
938 if (host->power == power)
939 return;
940
941 if (power == (unsigned short)-1) {
942 writeb(0, host->ioaddr + SDHCI_POWER_CONTROL);
943 goto out;
944 }
945
946 /*
947 * Spec says that we should clear the power reg before setting
948 * a new value. Some controllers don't seem to like this though.
949 */
950 if (!(host->quirks & SDHCI_QUIRK_SINGLE_POWER_WRITE))
951 writeb(0, host->ioaddr + SDHCI_POWER_CONTROL);
952
953 pwr = SDHCI_POWER_ON;
954
955 switch (1 << power) {
956 case MMC_VDD_165_195:
957 pwr |= SDHCI_POWER_180;
958 break;
959 case MMC_VDD_29_30:
960 case MMC_VDD_30_31:
961 pwr |= SDHCI_POWER_300;
962 break;
963 case MMC_VDD_32_33:
964 case MMC_VDD_33_34:
965 pwr |= SDHCI_POWER_330;
966 break;
967 default:
968 BUG();
969 }
970
971 /*
972 * At least the Marvell CaFe chip gets confused if we set the voltage
973 * and set turn on power at the same time, so set the voltage first.
974 */
975 if ((host->quirks & SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER))
976 writeb(pwr & ~SDHCI_POWER_ON,
977 host->ioaddr + SDHCI_POWER_CONTROL);
978
979 writeb(pwr, host->ioaddr + SDHCI_POWER_CONTROL);
980
981 out:
982 host->power = power;
983 }
984
985 /*****************************************************************************\
986 * *
987 * MMC callbacks *
988 * *
989 \*****************************************************************************/
990
991 static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
992 {
993 struct sdhci_host *host;
994 unsigned long flags;
995
996 host = mmc_priv(mmc);
997
998 spin_lock_irqsave(&host->lock, flags);
999
1000 WARN_ON(host->mrq != NULL);
1001
1002 #ifndef SDHCI_USE_LEDS_CLASS
1003 sdhci_activate_led(host);
1004 #endif
1005
1006 host->mrq = mrq;
1007
1008 if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT)
1009 || (host->flags & SDHCI_DEVICE_DEAD)) {
1010 host->mrq->cmd->error = -ENOMEDIUM;
1011 tasklet_schedule(&host->finish_tasklet);
1012 } else
1013 sdhci_send_command(host, mrq->cmd);
1014
1015 mmiowb();
1016 spin_unlock_irqrestore(&host->lock, flags);
1017 }
1018
1019 static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1020 {
1021 struct sdhci_host *host;
1022 unsigned long flags;
1023 u8 ctrl;
1024
1025 host = mmc_priv(mmc);
1026
1027 spin_lock_irqsave(&host->lock, flags);
1028
1029 if (host->flags & SDHCI_DEVICE_DEAD)
1030 goto out;
1031
1032 /*
1033 * Reset the chip on each power off.
1034 * Should clear out any weird states.
1035 */
1036 if (ios->power_mode == MMC_POWER_OFF) {
1037 writel(0, host->ioaddr + SDHCI_SIGNAL_ENABLE);
1038 sdhci_init(host);
1039 }
1040
1041 sdhci_set_clock(host, ios->clock);
1042
1043 if (ios->power_mode == MMC_POWER_OFF)
1044 sdhci_set_power(host, -1);
1045 else
1046 sdhci_set_power(host, ios->vdd);
1047
1048 ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
1049
1050 if (ios->bus_width == MMC_BUS_WIDTH_4)
1051 ctrl |= SDHCI_CTRL_4BITBUS;
1052 else
1053 ctrl &= ~SDHCI_CTRL_4BITBUS;
1054
1055 if (ios->timing == MMC_TIMING_SD_HS)
1056 ctrl |= SDHCI_CTRL_HISPD;
1057 else
1058 ctrl &= ~SDHCI_CTRL_HISPD;
1059
1060 writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
1061
1062 /*
1063 * Some (ENE) controllers go apeshit on some ios operation,
1064 * signalling timeout and CRC errors even on CMD0. Resetting
1065 * it on each ios seems to solve the problem.
1066 */
1067 if(host->quirks & SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS)
1068 sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
1069
1070 out:
1071 mmiowb();
1072 spin_unlock_irqrestore(&host->lock, flags);
1073 }
1074
1075 static int sdhci_get_ro(struct mmc_host *mmc)
1076 {
1077 struct sdhci_host *host;
1078 unsigned long flags;
1079 int present;
1080
1081 host = mmc_priv(mmc);
1082
1083 spin_lock_irqsave(&host->lock, flags);
1084
1085 if (host->flags & SDHCI_DEVICE_DEAD)
1086 present = 0;
1087 else
1088 present = readl(host->ioaddr + SDHCI_PRESENT_STATE);
1089
1090 spin_unlock_irqrestore(&host->lock, flags);
1091
1092 return !(present & SDHCI_WRITE_PROTECT);
1093 }
1094
1095 static void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable)
1096 {
1097 struct sdhci_host *host;
1098 unsigned long flags;
1099 u32 ier;
1100
1101 host = mmc_priv(mmc);
1102
1103 spin_lock_irqsave(&host->lock, flags);
1104
1105 if (host->flags & SDHCI_DEVICE_DEAD)
1106 goto out;
1107
1108 ier = readl(host->ioaddr + SDHCI_INT_ENABLE);
1109
1110 ier &= ~SDHCI_INT_CARD_INT;
1111 if (enable)
1112 ier |= SDHCI_INT_CARD_INT;
1113
1114 writel(ier, host->ioaddr + SDHCI_INT_ENABLE);
1115 writel(ier, host->ioaddr + SDHCI_SIGNAL_ENABLE);
1116
1117 out:
1118 mmiowb();
1119
1120 spin_unlock_irqrestore(&host->lock, flags);
1121 }
1122
1123 static const struct mmc_host_ops sdhci_ops = {
1124 .request = sdhci_request,
1125 .set_ios = sdhci_set_ios,
1126 .get_ro = sdhci_get_ro,
1127 .enable_sdio_irq = sdhci_enable_sdio_irq,
1128 };
1129
1130 /*****************************************************************************\
1131 * *
1132 * Tasklets *
1133 * *
1134 \*****************************************************************************/
1135
1136 static void sdhci_tasklet_card(unsigned long param)
1137 {
1138 struct sdhci_host *host;
1139 unsigned long flags;
1140
1141 host = (struct sdhci_host*)param;
1142
1143 spin_lock_irqsave(&host->lock, flags);
1144
1145 if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT)) {
1146 if (host->mrq) {
1147 printk(KERN_ERR "%s: Card removed during transfer!\n",
1148 mmc_hostname(host->mmc));
1149 printk(KERN_ERR "%s: Resetting controller.\n",
1150 mmc_hostname(host->mmc));
1151
1152 sdhci_reset(host, SDHCI_RESET_CMD);
1153 sdhci_reset(host, SDHCI_RESET_DATA);
1154
1155 host->mrq->cmd->error = -ENOMEDIUM;
1156 tasklet_schedule(&host->finish_tasklet);
1157 }
1158 }
1159
1160 spin_unlock_irqrestore(&host->lock, flags);
1161
1162 mmc_detect_change(host->mmc, msecs_to_jiffies(200));
1163 }
1164
1165 static void sdhci_tasklet_finish(unsigned long param)
1166 {
1167 struct sdhci_host *host;
1168 unsigned long flags;
1169 struct mmc_request *mrq;
1170
1171 host = (struct sdhci_host*)param;
1172
1173 spin_lock_irqsave(&host->lock, flags);
1174
1175 del_timer(&host->timer);
1176
1177 mrq = host->mrq;
1178
1179 /*
1180 * The controller needs a reset of internal state machines
1181 * upon error conditions.
1182 */
1183 if (!(host->flags & SDHCI_DEVICE_DEAD) &&
1184 (mrq->cmd->error ||
1185 (mrq->data && (mrq->data->error ||
1186 (mrq->data->stop && mrq->data->stop->error))) ||
1187 (host->quirks & SDHCI_QUIRK_RESET_AFTER_REQUEST))) {
1188
1189 /* Some controllers need this kick or reset won't work here */
1190 if (host->quirks & SDHCI_QUIRK_CLOCK_BEFORE_RESET) {
1191 unsigned int clock;
1192
1193 /* This is to force an update */
1194 clock = host->clock;
1195 host->clock = 0;
1196 sdhci_set_clock(host, clock);
1197 }
1198
1199 /* Spec says we should do both at the same time, but Ricoh
1200 controllers do not like that. */
1201 sdhci_reset(host, SDHCI_RESET_CMD);
1202 sdhci_reset(host, SDHCI_RESET_DATA);
1203 }
1204
1205 host->mrq = NULL;
1206 host->cmd = NULL;
1207 host->data = NULL;
1208
1209 #ifndef SDHCI_USE_LEDS_CLASS
1210 sdhci_deactivate_led(host);
1211 #endif
1212
1213 mmiowb();
1214 spin_unlock_irqrestore(&host->lock, flags);
1215
1216 mmc_request_done(host->mmc, mrq);
1217 }
1218
1219 static void sdhci_timeout_timer(unsigned long data)
1220 {
1221 struct sdhci_host *host;
1222 unsigned long flags;
1223
1224 host = (struct sdhci_host*)data;
1225
1226 spin_lock_irqsave(&host->lock, flags);
1227
1228 if (host->mrq) {
1229 printk(KERN_ERR "%s: Timeout waiting for hardware "
1230 "interrupt.\n", mmc_hostname(host->mmc));
1231 sdhci_dumpregs(host);
1232
1233 if (host->data) {
1234 host->data->error = -ETIMEDOUT;
1235 sdhci_finish_data(host);
1236 } else {
1237 if (host->cmd)
1238 host->cmd->error = -ETIMEDOUT;
1239 else
1240 host->mrq->cmd->error = -ETIMEDOUT;
1241
1242 tasklet_schedule(&host->finish_tasklet);
1243 }
1244 }
1245
1246 mmiowb();
1247 spin_unlock_irqrestore(&host->lock, flags);
1248 }
1249
1250 /*****************************************************************************\
1251 * *
1252 * Interrupt handling *
1253 * *
1254 \*****************************************************************************/
1255
1256 static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask)
1257 {
1258 BUG_ON(intmask == 0);
1259
1260 if (!host->cmd) {
1261 printk(KERN_ERR "%s: Got command interrupt 0x%08x even "
1262 "though no command operation was in progress.\n",
1263 mmc_hostname(host->mmc), (unsigned)intmask);
1264 sdhci_dumpregs(host);
1265 return;
1266 }
1267
1268 if (intmask & SDHCI_INT_TIMEOUT)
1269 host->cmd->error = -ETIMEDOUT;
1270 else if (intmask & (SDHCI_INT_CRC | SDHCI_INT_END_BIT |
1271 SDHCI_INT_INDEX))
1272 host->cmd->error = -EILSEQ;
1273
1274 if (host->cmd->error) {
1275 tasklet_schedule(&host->finish_tasklet);
1276 return;
1277 }
1278
1279 /*
1280 * The host can send and interrupt when the busy state has
1281 * ended, allowing us to wait without wasting CPU cycles.
1282 * Unfortunately this is overloaded on the "data complete"
1283 * interrupt, so we need to take some care when handling
1284 * it.
1285 *
1286 * Note: The 1.0 specification is a bit ambiguous about this
1287 * feature so there might be some problems with older
1288 * controllers.
1289 */
1290 if (host->cmd->flags & MMC_RSP_BUSY) {
1291 if (host->cmd->data)
1292 DBG("Cannot wait for busy signal when also "
1293 "doing a data transfer");
1294 else if (!(host->quirks & SDHCI_QUIRK_NO_BUSY_IRQ))
1295 return;
1296
1297 /* The controller does not support the end-of-busy IRQ,
1298 * fall through and take the SDHCI_INT_RESPONSE */
1299 }
1300
1301 if (intmask & SDHCI_INT_RESPONSE)
1302 sdhci_finish_command(host);
1303 }
1304
1305 static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
1306 {
1307 BUG_ON(intmask == 0);
1308
1309 if (!host->data) {
1310 /*
1311 * The "data complete" interrupt is also used to
1312 * indicate that a busy state has ended. See comment
1313 * above in sdhci_cmd_irq().
1314 */
1315 if (host->cmd && (host->cmd->flags & MMC_RSP_BUSY)) {
1316 if (intmask & SDHCI_INT_DATA_END) {
1317 sdhci_finish_command(host);
1318 return;
1319 }
1320 }
1321
1322 printk(KERN_ERR "%s: Got data interrupt 0x%08x even "
1323 "though no data operation was in progress.\n",
1324 mmc_hostname(host->mmc), (unsigned)intmask);
1325 sdhci_dumpregs(host);
1326
1327 return;
1328 }
1329
1330 if (intmask & SDHCI_INT_DATA_TIMEOUT)
1331 host->data->error = -ETIMEDOUT;
1332 else if (intmask & (SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_END_BIT))
1333 host->data->error = -EILSEQ;
1334 else if (intmask & SDHCI_INT_ADMA_ERROR)
1335 host->data->error = -EIO;
1336
1337 if (host->data->error)
1338 sdhci_finish_data(host);
1339 else {
1340 if (intmask & (SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL))
1341 sdhci_transfer_pio(host);
1342
1343 /*
1344 * We currently don't do anything fancy with DMA
1345 * boundaries, but as we can't disable the feature
1346 * we need to at least restart the transfer.
1347 */
1348 if (intmask & SDHCI_INT_DMA_END)
1349 writel(readl(host->ioaddr + SDHCI_DMA_ADDRESS),
1350 host->ioaddr + SDHCI_DMA_ADDRESS);
1351
1352 if (intmask & SDHCI_INT_DATA_END) {
1353 if (host->cmd) {
1354 /*
1355 * Data managed to finish before the
1356 * command completed. Make sure we do
1357 * things in the proper order.
1358 */
1359 host->data_early = 1;
1360 } else {
1361 sdhci_finish_data(host);
1362 }
1363 }
1364 }
1365 }
1366
1367 static irqreturn_t sdhci_irq(int irq, void *dev_id)
1368 {
1369 irqreturn_t result;
1370 struct sdhci_host* host = dev_id;
1371 u32 intmask;
1372 int cardint = 0;
1373
1374 spin_lock(&host->lock);
1375
1376 intmask = readl(host->ioaddr + SDHCI_INT_STATUS);
1377
1378 if (!intmask || intmask == 0xffffffff) {
1379 result = IRQ_NONE;
1380 goto out;
1381 }
1382
1383 DBG("*** %s got interrupt: 0x%08x\n",
1384 mmc_hostname(host->mmc), intmask);
1385
1386 if (intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
1387 writel(intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE),
1388 host->ioaddr + SDHCI_INT_STATUS);
1389 tasklet_schedule(&host->card_tasklet);
1390 }
1391
1392 intmask &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE);
1393
1394 if (intmask & SDHCI_INT_CMD_MASK) {
1395 writel(intmask & SDHCI_INT_CMD_MASK,
1396 host->ioaddr + SDHCI_INT_STATUS);
1397 sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK);
1398 }
1399
1400 if (intmask & SDHCI_INT_DATA_MASK) {
1401 writel(intmask & SDHCI_INT_DATA_MASK,
1402 host->ioaddr + SDHCI_INT_STATUS);
1403 sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK);
1404 }
1405
1406 intmask &= ~(SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK);
1407
1408 intmask &= ~SDHCI_INT_ERROR;
1409
1410 if (intmask & SDHCI_INT_BUS_POWER) {
1411 printk(KERN_ERR "%s: Card is consuming too much power!\n",
1412 mmc_hostname(host->mmc));
1413 writel(SDHCI_INT_BUS_POWER, host->ioaddr + SDHCI_INT_STATUS);
1414 }
1415
1416 intmask &= ~SDHCI_INT_BUS_POWER;
1417
1418 if (intmask & SDHCI_INT_CARD_INT)
1419 cardint = 1;
1420
1421 intmask &= ~SDHCI_INT_CARD_INT;
1422
1423 if (intmask) {
1424 printk(KERN_ERR "%s: Unexpected interrupt 0x%08x.\n",
1425 mmc_hostname(host->mmc), intmask);
1426 sdhci_dumpregs(host);
1427
1428 writel(intmask, host->ioaddr + SDHCI_INT_STATUS);
1429 }
1430
1431 result = IRQ_HANDLED;
1432
1433 mmiowb();
1434 out:
1435 spin_unlock(&host->lock);
1436
1437 /*
1438 * We have to delay this as it calls back into the driver.
1439 */
1440 if (cardint)
1441 mmc_signal_sdio_irq(host->mmc);
1442
1443 return result;
1444 }
1445
1446 /*****************************************************************************\
1447 * *
1448 * Suspend/resume *
1449 * *
1450 \*****************************************************************************/
1451
1452 #ifdef CONFIG_PM
1453
1454 int sdhci_suspend_host(struct sdhci_host *host, pm_message_t state)
1455 {
1456 int ret;
1457
1458 ret = mmc_suspend_host(host->mmc, state);
1459 if (ret)
1460 return ret;
1461
1462 free_irq(host->irq, host);
1463
1464 return 0;
1465 }
1466
1467 EXPORT_SYMBOL_GPL(sdhci_suspend_host);
1468
1469 int sdhci_resume_host(struct sdhci_host *host)
1470 {
1471 int ret;
1472
1473 if (host->flags & SDHCI_USE_DMA) {
1474 if (host->ops->enable_dma)
1475 host->ops->enable_dma(host);
1476 }
1477
1478 ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED,
1479 mmc_hostname(host->mmc), host);
1480 if (ret)
1481 return ret;
1482
1483 sdhci_init(host);
1484 mmiowb();
1485
1486 ret = mmc_resume_host(host->mmc);
1487 if (ret)
1488 return ret;
1489
1490 return 0;
1491 }
1492
1493 EXPORT_SYMBOL_GPL(sdhci_resume_host);
1494
1495 #endif /* CONFIG_PM */
1496
1497 /*****************************************************************************\
1498 * *
1499 * Device allocation/registration *
1500 * *
1501 \*****************************************************************************/
1502
1503 struct sdhci_host *sdhci_alloc_host(struct device *dev,
1504 size_t priv_size)
1505 {
1506 struct mmc_host *mmc;
1507 struct sdhci_host *host;
1508
1509 WARN_ON(dev == NULL);
1510
1511 mmc = mmc_alloc_host(sizeof(struct sdhci_host) + priv_size, dev);
1512 if (!mmc)
1513 return ERR_PTR(-ENOMEM);
1514
1515 host = mmc_priv(mmc);
1516 host->mmc = mmc;
1517
1518 return host;
1519 }
1520
1521 EXPORT_SYMBOL_GPL(sdhci_alloc_host);
1522
1523 int sdhci_add_host(struct sdhci_host *host)
1524 {
1525 struct mmc_host *mmc;
1526 unsigned int caps;
1527 int ret;
1528
1529 WARN_ON(host == NULL);
1530 if (host == NULL)
1531 return -EINVAL;
1532
1533 mmc = host->mmc;
1534
1535 if (debug_quirks)
1536 host->quirks = debug_quirks;
1537
1538 sdhci_reset(host, SDHCI_RESET_ALL);
1539
1540 host->version = readw(host->ioaddr + SDHCI_HOST_VERSION);
1541 host->version = (host->version & SDHCI_SPEC_VER_MASK)
1542 >> SDHCI_SPEC_VER_SHIFT;
1543 if (host->version > SDHCI_SPEC_200) {
1544 printk(KERN_ERR "%s: Unknown controller version (%d). "
1545 "You may experience problems.\n", mmc_hostname(mmc),
1546 host->version);
1547 }
1548
1549 caps = readl(host->ioaddr + SDHCI_CAPABILITIES);
1550
1551 if (host->quirks & SDHCI_QUIRK_FORCE_DMA)
1552 host->flags |= SDHCI_USE_DMA;
1553 else if (!(caps & SDHCI_CAN_DO_DMA))
1554 DBG("Controller doesn't have DMA capability\n");
1555 else
1556 host->flags |= SDHCI_USE_DMA;
1557
1558 if ((host->quirks & SDHCI_QUIRK_BROKEN_DMA) &&
1559 (host->flags & SDHCI_USE_DMA)) {
1560 DBG("Disabling DMA as it is marked broken\n");
1561 host->flags &= ~SDHCI_USE_DMA;
1562 }
1563
1564 if (host->flags & SDHCI_USE_DMA) {
1565 if ((host->version >= SDHCI_SPEC_200) &&
1566 (caps & SDHCI_CAN_DO_ADMA2))
1567 host->flags |= SDHCI_USE_ADMA;
1568 }
1569
1570 if ((host->quirks & SDHCI_QUIRK_BROKEN_ADMA) &&
1571 (host->flags & SDHCI_USE_ADMA)) {
1572 DBG("Disabling ADMA as it is marked broken\n");
1573 host->flags &= ~SDHCI_USE_ADMA;
1574 }
1575
1576 if (host->flags & SDHCI_USE_DMA) {
1577 if (host->ops->enable_dma) {
1578 if (host->ops->enable_dma(host)) {
1579 printk(KERN_WARNING "%s: No suitable DMA "
1580 "available. Falling back to PIO.\n",
1581 mmc_hostname(mmc));
1582 host->flags &= ~(SDHCI_USE_DMA | SDHCI_USE_ADMA);
1583 }
1584 }
1585 }
1586
1587 if (host->flags & SDHCI_USE_ADMA) {
1588 /*
1589 * We need to allocate descriptors for all sg entries
1590 * (128) and potentially one alignment transfer for
1591 * each of those entries.
1592 */
1593 host->adma_desc = kmalloc((128 * 2 + 1) * 4, GFP_KERNEL);
1594 host->align_buffer = kmalloc(128 * 4, GFP_KERNEL);
1595 if (!host->adma_desc || !host->align_buffer) {
1596 kfree(host->adma_desc);
1597 kfree(host->align_buffer);
1598 printk(KERN_WARNING "%s: Unable to allocate ADMA "
1599 "buffers. Falling back to standard DMA.\n",
1600 mmc_hostname(mmc));
1601 host->flags &= ~SDHCI_USE_ADMA;
1602 }
1603 }
1604
1605 /*
1606 * If we use DMA, then it's up to the caller to set the DMA
1607 * mask, but PIO does not need the hw shim so we set a new
1608 * mask here in that case.
1609 */
1610 if (!(host->flags & SDHCI_USE_DMA)) {
1611 host->dma_mask = DMA_BIT_MASK(64);
1612 mmc_dev(host->mmc)->dma_mask = &host->dma_mask;
1613 }
1614
1615 host->max_clk =
1616 (caps & SDHCI_CLOCK_BASE_MASK) >> SDHCI_CLOCK_BASE_SHIFT;
1617 if (host->max_clk == 0) {
1618 printk(KERN_ERR "%s: Hardware doesn't specify base clock "
1619 "frequency.\n", mmc_hostname(mmc));
1620 return -ENODEV;
1621 }
1622 host->max_clk *= 1000000;
1623
1624 host->timeout_clk =
1625 (caps & SDHCI_TIMEOUT_CLK_MASK) >> SDHCI_TIMEOUT_CLK_SHIFT;
1626 if (host->timeout_clk == 0) {
1627 printk(KERN_ERR "%s: Hardware doesn't specify timeout clock "
1628 "frequency.\n", mmc_hostname(mmc));
1629 return -ENODEV;
1630 }
1631 if (caps & SDHCI_TIMEOUT_CLK_UNIT)
1632 host->timeout_clk *= 1000;
1633
1634 /*
1635 * Set host parameters.
1636 */
1637 mmc->ops = &sdhci_ops;
1638 mmc->f_min = host->max_clk / 256;
1639 mmc->f_max = host->max_clk;
1640 mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ;
1641
1642 if (caps & SDHCI_CAN_DO_HISPD)
1643 mmc->caps |= MMC_CAP_SD_HIGHSPEED;
1644
1645 mmc->ocr_avail = 0;
1646 if (caps & SDHCI_CAN_VDD_330)
1647 mmc->ocr_avail |= MMC_VDD_32_33|MMC_VDD_33_34;
1648 if (caps & SDHCI_CAN_VDD_300)
1649 mmc->ocr_avail |= MMC_VDD_29_30|MMC_VDD_30_31;
1650 if (caps & SDHCI_CAN_VDD_180)
1651 mmc->ocr_avail |= MMC_VDD_165_195;
1652
1653 if (mmc->ocr_avail == 0) {
1654 printk(KERN_ERR "%s: Hardware doesn't report any "
1655 "support voltages.\n", mmc_hostname(mmc));
1656 return -ENODEV;
1657 }
1658
1659 spin_lock_init(&host->lock);
1660
1661 /*
1662 * Maximum number of segments. Depends on if the hardware
1663 * can do scatter/gather or not.
1664 */
1665 if (host->flags & SDHCI_USE_ADMA)
1666 mmc->max_hw_segs = 128;
1667 else if (host->flags & SDHCI_USE_DMA)
1668 mmc->max_hw_segs = 1;
1669 else /* PIO */
1670 mmc->max_hw_segs = 128;
1671 mmc->max_phys_segs = 128;
1672
1673 /*
1674 * Maximum number of sectors in one transfer. Limited by DMA boundary
1675 * size (512KiB).
1676 */
1677 mmc->max_req_size = 524288;
1678
1679 /*
1680 * Maximum segment size. Could be one segment with the maximum number
1681 * of bytes. When doing hardware scatter/gather, each entry cannot
1682 * be larger than 64 KiB though.
1683 */
1684 if (host->flags & SDHCI_USE_ADMA)
1685 mmc->max_seg_size = 65536;
1686 else
1687 mmc->max_seg_size = mmc->max_req_size;
1688
1689 /*
1690 * Maximum block size. This varies from controller to controller and
1691 * is specified in the capabilities register.
1692 */
1693 mmc->max_blk_size = (caps & SDHCI_MAX_BLOCK_MASK) >> SDHCI_MAX_BLOCK_SHIFT;
1694 if (mmc->max_blk_size >= 3) {
1695 printk(KERN_WARNING "%s: Invalid maximum block size, "
1696 "assuming 512 bytes\n", mmc_hostname(mmc));
1697 mmc->max_blk_size = 512;
1698 } else
1699 mmc->max_blk_size = 512 << mmc->max_blk_size;
1700
1701 /*
1702 * Maximum block count.
1703 */
1704 mmc->max_blk_count = 65535;
1705
1706 /*
1707 * Init tasklets.
1708 */
1709 tasklet_init(&host->card_tasklet,
1710 sdhci_tasklet_card, (unsigned long)host);
1711 tasklet_init(&host->finish_tasklet,
1712 sdhci_tasklet_finish, (unsigned long)host);
1713
1714 setup_timer(&host->timer, sdhci_timeout_timer, (unsigned long)host);
1715
1716 ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED,
1717 mmc_hostname(mmc), host);
1718 if (ret)
1719 goto untasklet;
1720
1721 sdhci_init(host);
1722
1723 #ifdef CONFIG_MMC_DEBUG
1724 sdhci_dumpregs(host);
1725 #endif
1726
1727 #ifdef SDHCI_USE_LEDS_CLASS
1728 snprintf(host->led_name, sizeof(host->led_name),
1729 "%s::", mmc_hostname(mmc));
1730 host->led.name = host->led_name;
1731 host->led.brightness = LED_OFF;
1732 host->led.default_trigger = mmc_hostname(mmc);
1733 host->led.brightness_set = sdhci_led_control;
1734
1735 ret = led_classdev_register(mmc_dev(mmc), &host->led);
1736 if (ret)
1737 goto reset;
1738 #endif
1739
1740 mmiowb();
1741
1742 mmc_add_host(mmc);
1743
1744 printk(KERN_INFO "%s: SDHCI controller on %s [%s] using %s%s\n",
1745 mmc_hostname(mmc), host->hw_name, dev_name(mmc_dev(mmc)),
1746 (host->flags & SDHCI_USE_ADMA)?"A":"",
1747 (host->flags & SDHCI_USE_DMA)?"DMA":"PIO");
1748
1749 return 0;
1750
1751 #ifdef SDHCI_USE_LEDS_CLASS
1752 reset:
1753 sdhci_reset(host, SDHCI_RESET_ALL);
1754 free_irq(host->irq, host);
1755 #endif
1756 untasklet:
1757 tasklet_kill(&host->card_tasklet);
1758 tasklet_kill(&host->finish_tasklet);
1759
1760 return ret;
1761 }
1762
1763 EXPORT_SYMBOL_GPL(sdhci_add_host);
1764
1765 void sdhci_remove_host(struct sdhci_host *host, int dead)
1766 {
1767 unsigned long flags;
1768
1769 if (dead) {
1770 spin_lock_irqsave(&host->lock, flags);
1771
1772 host->flags |= SDHCI_DEVICE_DEAD;
1773
1774 if (host->mrq) {
1775 printk(KERN_ERR "%s: Controller removed during "
1776 " transfer!\n", mmc_hostname(host->mmc));
1777
1778 host->mrq->cmd->error = -ENOMEDIUM;
1779 tasklet_schedule(&host->finish_tasklet);
1780 }
1781
1782 spin_unlock_irqrestore(&host->lock, flags);
1783 }
1784
1785 mmc_remove_host(host->mmc);
1786
1787 #ifdef SDHCI_USE_LEDS_CLASS
1788 led_classdev_unregister(&host->led);
1789 #endif
1790
1791 if (!dead)
1792 sdhci_reset(host, SDHCI_RESET_ALL);
1793
1794 free_irq(host->irq, host);
1795
1796 del_timer_sync(&host->timer);
1797
1798 tasklet_kill(&host->card_tasklet);
1799 tasklet_kill(&host->finish_tasklet);
1800
1801 kfree(host->adma_desc);
1802 kfree(host->align_buffer);
1803
1804 host->adma_desc = NULL;
1805 host->align_buffer = NULL;
1806 }
1807
1808 EXPORT_SYMBOL_GPL(sdhci_remove_host);
1809
1810 void sdhci_free_host(struct sdhci_host *host)
1811 {
1812 mmc_free_host(host->mmc);
1813 }
1814
1815 EXPORT_SYMBOL_GPL(sdhci_free_host);
1816
1817 /*****************************************************************************\
1818 * *
1819 * Driver init/exit *
1820 * *
1821 \*****************************************************************************/
1822
1823 static int __init sdhci_drv_init(void)
1824 {
1825 printk(KERN_INFO DRIVER_NAME
1826 ": Secure Digital Host Controller Interface driver\n");
1827 printk(KERN_INFO DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
1828
1829 return 0;
1830 }
1831
1832 static void __exit sdhci_drv_exit(void)
1833 {
1834 }
1835
1836 module_init(sdhci_drv_init);
1837 module_exit(sdhci_drv_exit);
1838
1839 module_param(debug_quirks, uint, 0444);
1840
1841 MODULE_AUTHOR("Pierre Ossman <drzeus@drzeus.cx>");
1842 MODULE_DESCRIPTION("Secure Digital Host Controller Interface core driver");
1843 MODULE_LICENSE("GPL");
1844
1845 MODULE_PARM_DESC(debug_quirks, "Force certain quirks.");
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