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usb: renesas_usbhs: fixup comment-out
[linux-2.6/next.git] / drivers / mmc / core / sd.c
blobff2774128aa93b1231538b1f5e014b0df987e7ca
1 /*
2 * linux/drivers/mmc/core/sd.c
3 *
4 * Copyright (C) 2003-2004 Russell King, All Rights Reserved.
5 * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
6 * Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13 #include <linux/err.h>
14 #include <linux/slab.h>
15
16 #include <linux/mmc/host.h>
17 #include <linux/mmc/card.h>
18 #include <linux/mmc/mmc.h>
19 #include <linux/mmc/sd.h>
20
21 #include "core.h"
22 #include "bus.h"
23 #include "mmc_ops.h"
24 #include "sd.h"
25 #include "sd_ops.h"
26
27 static const unsigned int tran_exp[] = {
28 10000, 100000, 1000000, 10000000,
29 0, 0, 0, 0
30 };
31
32 static const unsigned char tran_mant[] = {
33 0, 10, 12, 13, 15, 20, 25, 30,
34 35, 40, 45, 50, 55, 60, 70, 80,
35 };
36
37 static const unsigned int tacc_exp[] = {
38 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
39 };
40
41 static const unsigned int tacc_mant[] = {
42 0, 10, 12, 13, 15, 20, 25, 30,
43 35, 40, 45, 50, 55, 60, 70, 80,
44 };
45
46 #define UNSTUFF_BITS(resp,start,size) \
47 ({ \
48 const int __size = size; \
49 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
50 const int __off = 3 - ((start) / 32); \
51 const int __shft = (start) & 31; \
52 u32 __res; \
53 \
54 __res = resp[__off] >> __shft; \
55 if (__size + __shft > 32) \
56 __res |= resp[__off-1] << ((32 - __shft) % 32); \
57 __res & __mask; \
58 })
59
60 /*
61 * Given the decoded CSD structure, decode the raw CID to our CID structure.
62 */
63 void mmc_decode_cid(struct mmc_card *card)
64 {
65 u32 *resp = card->raw_cid;
66
67 memset(&card->cid, 0, sizeof(struct mmc_cid));
68
69 /*
70 * SD doesn't currently have a version field so we will
71 * have to assume we can parse this.
72 */
73 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
74 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
75 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
76 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
77 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
78 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
79 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
80 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4);
81 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4);
82 card->cid.serial = UNSTUFF_BITS(resp, 24, 32);
83 card->cid.year = UNSTUFF_BITS(resp, 12, 8);
84 card->cid.month = UNSTUFF_BITS(resp, 8, 4);
85
86 card->cid.year += 2000; /* SD cards year offset */
87 }
88
89 /*
90 * Given a 128-bit response, decode to our card CSD structure.
91 */
92 static int mmc_decode_csd(struct mmc_card *card)
93 {
94 struct mmc_csd *csd = &card->csd;
95 unsigned int e, m, csd_struct;
96 u32 *resp = card->raw_csd;
97
98 csd_struct = UNSTUFF_BITS(resp, 126, 2);
99
100 switch (csd_struct) {
101 case 0:
102 m = UNSTUFF_BITS(resp, 115, 4);
103 e = UNSTUFF_BITS(resp, 112, 3);
104 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
105 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
106
107 m = UNSTUFF_BITS(resp, 99, 4);
108 e = UNSTUFF_BITS(resp, 96, 3);
109 csd->max_dtr = tran_exp[e] * tran_mant[m];
110 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
111
112 e = UNSTUFF_BITS(resp, 47, 3);
113 m = UNSTUFF_BITS(resp, 62, 12);
114 csd->capacity = (1 + m) << (e + 2);
115
116 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
117 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
118 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
119 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
120 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
121 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
122 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
123
124 if (UNSTUFF_BITS(resp, 46, 1)) {
125 csd->erase_size = 1;
126 } else if (csd->write_blkbits >= 9) {
127 csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1;
128 csd->erase_size <<= csd->write_blkbits - 9;
129 }
130 break;
131 case 1:
132 /*
133 * This is a block-addressed SDHC or SDXC card. Most
134 * interesting fields are unused and have fixed
135 * values. To avoid getting tripped by buggy cards,
136 * we assume those fixed values ourselves.
137 */
138 mmc_card_set_blockaddr(card);
139
140 csd->tacc_ns = 0; /* Unused */
141 csd->tacc_clks = 0; /* Unused */
142
143 m = UNSTUFF_BITS(resp, 99, 4);
144 e = UNSTUFF_BITS(resp, 96, 3);
145 csd->max_dtr = tran_exp[e] * tran_mant[m];
146 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
147 csd->c_size = UNSTUFF_BITS(resp, 48, 22);
148
149 /* SDXC cards have a minimum C_SIZE of 0x00FFFF */
150 if (csd->c_size >= 0xFFFF)
151 mmc_card_set_ext_capacity(card);
152
153 m = UNSTUFF_BITS(resp, 48, 22);
154 csd->capacity = (1 + m) << 10;
155
156 csd->read_blkbits = 9;
157 csd->read_partial = 0;
158 csd->write_misalign = 0;
159 csd->read_misalign = 0;
160 csd->r2w_factor = 4; /* Unused */
161 csd->write_blkbits = 9;
162 csd->write_partial = 0;
163 csd->erase_size = 1;
164 break;
165 default:
166 printk(KERN_ERR "%s: unrecognised CSD structure version %d\n",
167 mmc_hostname(card->host), csd_struct);
168 return -EINVAL;
169 }
170
171 card->erase_size = csd->erase_size;
172
173 return 0;
174 }
175
176 /*
177 * Given a 64-bit response, decode to our card SCR structure.
178 */
179 static int mmc_decode_scr(struct mmc_card *card)
180 {
181 struct sd_scr *scr = &card->scr;
182 unsigned int scr_struct;
183 u32 resp[4];
184
185 resp[3] = card->raw_scr[1];
186 resp[2] = card->raw_scr[0];
187
188 scr_struct = UNSTUFF_BITS(resp, 60, 4);
189 if (scr_struct != 0) {
190 printk(KERN_ERR "%s: unrecognised SCR structure version %d\n",
191 mmc_hostname(card->host), scr_struct);
192 return -EINVAL;
193 }
194
195 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
196 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
197 if (scr->sda_vsn == SCR_SPEC_VER_2)
198 /* Check if Physical Layer Spec v3.0 is supported */
199 scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1);
200
201 if (UNSTUFF_BITS(resp, 55, 1))
202 card->erased_byte = 0xFF;
203 else
204 card->erased_byte = 0x0;
205
206 if (scr->sda_spec3)
207 scr->cmds = UNSTUFF_BITS(resp, 32, 2);
208 return 0;
209 }
210
211 /*
212 * Fetch and process SD Status register.
213 */
214 static int mmc_read_ssr(struct mmc_card *card)
215 {
216 unsigned int au, es, et, eo;
217 int err, i;
218 u32 *ssr;
219
220 if (!(card->csd.cmdclass & CCC_APP_SPEC)) {
221 printk(KERN_WARNING "%s: card lacks mandatory SD Status "
222 "function.\n", mmc_hostname(card->host));
223 return 0;
224 }
225
226 ssr = kmalloc(64, GFP_KERNEL);
227 if (!ssr)
228 return -ENOMEM;
229
230 err = mmc_app_sd_status(card, ssr);
231 if (err) {
232 printk(KERN_WARNING "%s: problem reading SD Status "
233 "register.\n", mmc_hostname(card->host));
234 err = 0;
235 goto out;
236 }
237
238 for (i = 0; i < 16; i++)
239 ssr[i] = be32_to_cpu(ssr[i]);
240
241 /*
242 * UNSTUFF_BITS only works with four u32s so we have to offset the
243 * bitfield positions accordingly.
244 */
245 au = UNSTUFF_BITS(ssr, 428 - 384, 4);
246 if (au > 0 || au <= 9) {
247 card->ssr.au = 1 << (au + 4);
248 es = UNSTUFF_BITS(ssr, 408 - 384, 16);
249 et = UNSTUFF_BITS(ssr, 402 - 384, 6);
250 eo = UNSTUFF_BITS(ssr, 400 - 384, 2);
251 if (es && et) {
252 card->ssr.erase_timeout = (et * 1000) / es;
253 card->ssr.erase_offset = eo * 1000;
254 }
255 } else {
256 printk(KERN_WARNING "%s: SD Status: Invalid Allocation Unit "
257 "size.\n", mmc_hostname(card->host));
258 }
259 out:
260 kfree(ssr);
261 return err;
262 }
263
264 /*
265 * Fetches and decodes switch information
266 */
267 static int mmc_read_switch(struct mmc_card *card)
268 {
269 int err;
270 u8 *status;
271
272 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
273 return 0;
274
275 if (!(card->csd.cmdclass & CCC_SWITCH)) {
276 printk(KERN_WARNING "%s: card lacks mandatory switch "
277 "function, performance might suffer.\n",
278 mmc_hostname(card->host));
279 return 0;
280 }
281
282 err = -EIO;
283
284 status = kmalloc(64, GFP_KERNEL);
285 if (!status) {
286 printk(KERN_ERR "%s: could not allocate a buffer for "
287 "switch capabilities.\n",
288 mmc_hostname(card->host));
289 return -ENOMEM;
290 }
291
292 /* Find out the supported Bus Speed Modes. */
293 err = mmc_sd_switch(card, 0, 0, 1, status);
294 if (err) {
295 /*
296 * If the host or the card can't do the switch,
297 * fail more gracefully.
298 */
299 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
300 goto out;
301
302 printk(KERN_WARNING "%s: problem reading Bus Speed modes.\n",
303 mmc_hostname(card->host));
304 err = 0;
305
306 goto out;
307 }
308
309 if (card->scr.sda_spec3) {
310 card->sw_caps.sd3_bus_mode = status[13];
311
312 /* Find out Driver Strengths supported by the card */
313 err = mmc_sd_switch(card, 0, 2, 1, status);
314 if (err) {
315 /*
316 * If the host or the card can't do the switch,
317 * fail more gracefully.
318 */
319 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
320 goto out;
321
322 printk(KERN_WARNING "%s: problem reading "
323 "Driver Strength.\n",
324 mmc_hostname(card->host));
325 err = 0;
326
327 goto out;
328 }
329
330 card->sw_caps.sd3_drv_type = status[9];
331
332 /* Find out Current Limits supported by the card */
333 err = mmc_sd_switch(card, 0, 3, 1, status);
334 if (err) {
335 /*
336 * If the host or the card can't do the switch,
337 * fail more gracefully.
338 */
339 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
340 goto out;
341
342 printk(KERN_WARNING "%s: problem reading "
343 "Current Limit.\n",
344 mmc_hostname(card->host));
345 err = 0;
346
347 goto out;
348 }
349
350 card->sw_caps.sd3_curr_limit = status[7];
351 } else {
352 if (status[13] & 0x02)
353 card->sw_caps.hs_max_dtr = 50000000;
354 }
355
356 out:
357 kfree(status);
358
359 return err;
360 }
361
362 /*
363 * Test if the card supports high-speed mode and, if so, switch to it.
364 */
365 int mmc_sd_switch_hs(struct mmc_card *card)
366 {
367 int err;
368 u8 *status;
369
370 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
371 return 0;
372
373 if (!(card->csd.cmdclass & CCC_SWITCH))
374 return 0;
375
376 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
377 return 0;
378
379 if (card->sw_caps.hs_max_dtr == 0)
380 return 0;
381
382 err = -EIO;
383
384 status = kmalloc(64, GFP_KERNEL);
385 if (!status) {
386 printk(KERN_ERR "%s: could not allocate a buffer for "
387 "switch capabilities.\n", mmc_hostname(card->host));
388 return -ENOMEM;
389 }
390
391 err = mmc_sd_switch(card, 1, 0, 1, status);
392 if (err)
393 goto out;
394
395 if ((status[16] & 0xF) != 1) {
396 printk(KERN_WARNING "%s: Problem switching card "
397 "into high-speed mode!\n",
398 mmc_hostname(card->host));
399 err = 0;
400 } else {
401 err = 1;
402 }
403
404 out:
405 kfree(status);
406
407 return err;
408 }
409
410 static int sd_select_driver_type(struct mmc_card *card, u8 *status)
411 {
412 int host_drv_type = 0, card_drv_type = 0;
413 int err;
414
415 /*
416 * If the host doesn't support any of the Driver Types A,C or D,
417 * default Driver Type B is used.
418 */
419 if (!(card->host->caps & (MMC_CAP_DRIVER_TYPE_A | MMC_CAP_DRIVER_TYPE_C
420 | MMC_CAP_DRIVER_TYPE_D)))
421 return 0;
422
423 if (card->host->caps & MMC_CAP_DRIVER_TYPE_A) {
424 host_drv_type = MMC_SET_DRIVER_TYPE_A;
425 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A)
426 card_drv_type = MMC_SET_DRIVER_TYPE_A;
427 else if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_B)
428 card_drv_type = MMC_SET_DRIVER_TYPE_B;
429 else if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
430 card_drv_type = MMC_SET_DRIVER_TYPE_C;
431 } else if (card->host->caps & MMC_CAP_DRIVER_TYPE_C) {
432 host_drv_type = MMC_SET_DRIVER_TYPE_C;
433 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
434 card_drv_type = MMC_SET_DRIVER_TYPE_C;
435 } else if (!(card->host->caps & MMC_CAP_DRIVER_TYPE_D)) {
436 /*
437 * If we are here, that means only the default driver type
438 * B is supported by the host.
439 */
440 host_drv_type = MMC_SET_DRIVER_TYPE_B;
441 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_B)
442 card_drv_type = MMC_SET_DRIVER_TYPE_B;
443 else if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
444 card_drv_type = MMC_SET_DRIVER_TYPE_C;
445 }
446
447 err = mmc_sd_switch(card, 1, 2, card_drv_type, status);
448 if (err)
449 return err;
450
451 if ((status[15] & 0xF) != card_drv_type) {
452 printk(KERN_WARNING "%s: Problem setting driver strength!\n",
453 mmc_hostname(card->host));
454 return 0;
455 }
456
457 mmc_set_driver_type(card->host, host_drv_type);
458
459 return 0;
460 }
461
462 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status)
463 {
464 unsigned int bus_speed = 0, timing = 0;
465 int err;
466
467 /*
468 * If the host doesn't support any of the UHS-I modes, fallback on
469 * default speed.
470 */
471 if (!(card->host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
472 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50)))
473 return 0;
474
475 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
476 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
477 bus_speed = UHS_SDR104_BUS_SPEED;
478 timing = MMC_TIMING_UHS_SDR104;
479 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
480 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
481 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
482 bus_speed = UHS_DDR50_BUS_SPEED;
483 timing = MMC_TIMING_UHS_DDR50;
484 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
485 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
486 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
487 SD_MODE_UHS_SDR50)) {
488 bus_speed = UHS_SDR50_BUS_SPEED;
489 timing = MMC_TIMING_UHS_SDR50;
490 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
491 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
492 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
493 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
494 bus_speed = UHS_SDR25_BUS_SPEED;
495 timing = MMC_TIMING_UHS_SDR25;
496 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
497 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
498 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
499 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
500 SD_MODE_UHS_SDR12)) {
501 bus_speed = UHS_SDR12_BUS_SPEED;
502 timing = MMC_TIMING_UHS_SDR12;
503 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
504 }
505
506 card->sd_bus_speed = bus_speed;
507 err = mmc_sd_switch(card, 1, 0, bus_speed, status);
508 if (err)
509 return err;
510
511 if ((status[16] & 0xF) != bus_speed)
512 printk(KERN_WARNING "%s: Problem setting bus speed mode!\n",
513 mmc_hostname(card->host));
514 else {
515 mmc_set_timing(card->host, timing);
516 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
517 }
518
519 return 0;
520 }
521
522 static int sd_set_current_limit(struct mmc_card *card, u8 *status)
523 {
524 int current_limit = 0;
525 int err;
526
527 /*
528 * Current limit switch is only defined for SDR50, SDR104, and DDR50
529 * bus speed modes. For other bus speed modes, we set the default
530 * current limit of 200mA.
531 */
532 if ((card->sd_bus_speed == UHS_SDR50_BUS_SPEED) ||
533 (card->sd_bus_speed == UHS_SDR104_BUS_SPEED) ||
534 (card->sd_bus_speed == UHS_DDR50_BUS_SPEED)) {
535 if (card->host->caps & MMC_CAP_MAX_CURRENT_800) {
536 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800)
537 current_limit = SD_SET_CURRENT_LIMIT_800;
538 else if (card->sw_caps.sd3_curr_limit &
539 SD_MAX_CURRENT_600)
540 current_limit = SD_SET_CURRENT_LIMIT_600;
541 else if (card->sw_caps.sd3_curr_limit &
542 SD_MAX_CURRENT_400)
543 current_limit = SD_SET_CURRENT_LIMIT_400;
544 else if (card->sw_caps.sd3_curr_limit &
545 SD_MAX_CURRENT_200)
546 current_limit = SD_SET_CURRENT_LIMIT_200;
547 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_600) {
548 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600)
549 current_limit = SD_SET_CURRENT_LIMIT_600;
550 else if (card->sw_caps.sd3_curr_limit &
551 SD_MAX_CURRENT_400)
552 current_limit = SD_SET_CURRENT_LIMIT_400;
553 else if (card->sw_caps.sd3_curr_limit &
554 SD_MAX_CURRENT_200)
555 current_limit = SD_SET_CURRENT_LIMIT_200;
556 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_400) {
557 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400)
558 current_limit = SD_SET_CURRENT_LIMIT_400;
559 else if (card->sw_caps.sd3_curr_limit &
560 SD_MAX_CURRENT_200)
561 current_limit = SD_SET_CURRENT_LIMIT_200;
562 } else if (card->host->caps & MMC_CAP_MAX_CURRENT_200) {
563 if (card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200)
564 current_limit = SD_SET_CURRENT_LIMIT_200;
565 }
566 } else
567 current_limit = SD_SET_CURRENT_LIMIT_200;
568
569 err = mmc_sd_switch(card, 1, 3, current_limit, status);
570 if (err)
571 return err;
572
573 if (((status[15] >> 4) & 0x0F) != current_limit)
574 printk(KERN_WARNING "%s: Problem setting current limit!\n",
575 mmc_hostname(card->host));
576
577 return 0;
578 }
579
580 /*
581 * UHS-I specific initialization procedure
582 */
583 static int mmc_sd_init_uhs_card(struct mmc_card *card)
584 {
585 int err;
586 u8 *status;
587
588 if (!card->scr.sda_spec3)
589 return 0;
590
591 if (!(card->csd.cmdclass & CCC_SWITCH))
592 return 0;
593
594 status = kmalloc(64, GFP_KERNEL);
595 if (!status) {
596 printk(KERN_ERR "%s: could not allocate a buffer for "
597 "switch capabilities.\n", mmc_hostname(card->host));
598 return -ENOMEM;
599 }
600
601 /* Set 4-bit bus width */
602 if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
603 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
604 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
605 if (err)
606 goto out;
607
608 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
609 }
610
611 /* Set the driver strength for the card */
612 err = sd_select_driver_type(card, status);
613 if (err)
614 goto out;
615
616 /* Set bus speed mode of the card */
617 err = sd_set_bus_speed_mode(card, status);
618 if (err)
619 goto out;
620
621 /* Set current limit for the card */
622 err = sd_set_current_limit(card, status);
623 if (err)
624 goto out;
625
626 /* SPI mode doesn't define CMD19 */
627 if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning)
628 err = card->host->ops->execute_tuning(card->host);
629
630 out:
631 kfree(status);
632
633 return err;
634 }
635
636 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
637 card->raw_cid[2], card->raw_cid[3]);
638 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
639 card->raw_csd[2], card->raw_csd[3]);
640 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
641 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
642 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
643 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
644 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
645 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
646 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
647 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
648 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
649 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
650
651
652 static struct attribute *sd_std_attrs[] = {
653 &dev_attr_cid.attr,
654 &dev_attr_csd.attr,
655 &dev_attr_scr.attr,
656 &dev_attr_date.attr,
657 &dev_attr_erase_size.attr,
658 &dev_attr_preferred_erase_size.attr,
659 &dev_attr_fwrev.attr,
660 &dev_attr_hwrev.attr,
661 &dev_attr_manfid.attr,
662 &dev_attr_name.attr,
663 &dev_attr_oemid.attr,
664 &dev_attr_serial.attr,
665 NULL,
666 };
667
668 static struct attribute_group sd_std_attr_group = {
669 .attrs = sd_std_attrs,
670 };
671
672 static const struct attribute_group *sd_attr_groups[] = {
673 &sd_std_attr_group,
674 NULL,
675 };
676
677 struct device_type sd_type = {
678 .groups = sd_attr_groups,
679 };
680
681 /*
682 * Fetch CID from card.
683 */
684 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
685 {
686 int err;
687
688 /*
689 * Since we're changing the OCR value, we seem to
690 * need to tell some cards to go back to the idle
691 * state. We wait 1ms to give cards time to
692 * respond.
693 */
694 mmc_go_idle(host);
695
696 /*
697 * If SD_SEND_IF_COND indicates an SD 2.0
698 * compliant card and we should set bit 30
699 * of the ocr to indicate that we can handle
700 * block-addressed SDHC cards.
701 */
702 err = mmc_send_if_cond(host, ocr);
703 if (!err)
704 ocr |= SD_OCR_CCS;
705
706 /*
707 * If the host supports one of UHS-I modes, request the card
708 * to switch to 1.8V signaling level.
709 */
710 if (host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
711 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50))
712 ocr |= SD_OCR_S18R;
713
714 /* If the host can supply more than 150mA, XPC should be set to 1. */
715 if (host->caps & (MMC_CAP_SET_XPC_330 | MMC_CAP_SET_XPC_300 |
716 MMC_CAP_SET_XPC_180))
717 ocr |= SD_OCR_XPC;
718
719 try_again:
720 err = mmc_send_app_op_cond(host, ocr, rocr);
721 if (err)
722 return err;
723
724 /*
725 * In case CCS and S18A in the response is set, start Signal Voltage
726 * Switch procedure. SPI mode doesn't support CMD11.
727 */
728 if (!mmc_host_is_spi(host) && rocr &&
729 ((*rocr & 0x41000000) == 0x41000000)) {
730 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, true);
731 if (err) {
732 ocr &= ~SD_OCR_S18R;
733 goto try_again;
734 }
735 }
736
737 if (mmc_host_is_spi(host))
738 err = mmc_send_cid(host, cid);
739 else
740 err = mmc_all_send_cid(host, cid);
741
742 return err;
743 }
744
745 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card)
746 {
747 int err;
748
749 /*
750 * Fetch CSD from card.
751 */
752 err = mmc_send_csd(card, card->raw_csd);
753 if (err)
754 return err;
755
756 err = mmc_decode_csd(card);
757 if (err)
758 return err;
759
760 return 0;
761 }
762
763 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
764 bool reinit)
765 {
766 int err;
767
768 if (!reinit) {
769 /*
770 * Fetch SCR from card.
771 */
772 err = mmc_app_send_scr(card, card->raw_scr);
773 if (err)
774 return err;
775
776 err = mmc_decode_scr(card);
777 if (err)
778 return err;
779
780 /*
781 * Fetch and process SD Status register.
782 */
783 err = mmc_read_ssr(card);
784 if (err)
785 return err;
786
787 /* Erase init depends on CSD and SSR */
788 mmc_init_erase(card);
789
790 /*
791 * Fetch switch information from card.
792 */
793 err = mmc_read_switch(card);
794 if (err)
795 return err;
796 }
797
798 /*
799 * For SPI, enable CRC as appropriate.
800 * This CRC enable is located AFTER the reading of the
801 * card registers because some SDHC cards are not able
802 * to provide valid CRCs for non-512-byte blocks.
803 */
804 if (mmc_host_is_spi(host)) {
805 err = mmc_spi_set_crc(host, use_spi_crc);
806 if (err)
807 return err;
808 }
809
810 /*
811 * Check if read-only switch is active.
812 */
813 if (!reinit) {
814 int ro = -1;
815
816 if (host->ops->get_ro)
817 ro = host->ops->get_ro(host);
818
819 if (ro < 0) {
820 printk(KERN_WARNING "%s: host does not "
821 "support reading read-only "
822 "switch. assuming write-enable.\n",
823 mmc_hostname(host));
824 } else if (ro > 0) {
825 mmc_card_set_readonly(card);
826 }
827 }
828
829 return 0;
830 }
831
832 unsigned mmc_sd_get_max_clock(struct mmc_card *card)
833 {
834 unsigned max_dtr = (unsigned int)-1;
835
836 if (mmc_card_highspeed(card)) {
837 if (max_dtr > card->sw_caps.hs_max_dtr)
838 max_dtr = card->sw_caps.hs_max_dtr;
839 } else if (max_dtr > card->csd.max_dtr) {
840 max_dtr = card->csd.max_dtr;
841 }
842
843 return max_dtr;
844 }
845
846 void mmc_sd_go_highspeed(struct mmc_card *card)
847 {
848 mmc_card_set_highspeed(card);
849 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
850 }
851
852 /*
853 * Handle the detection and initialisation of a card.
854 *
855 * In the case of a resume, "oldcard" will contain the card
856 * we're trying to reinitialise.
857 */
858 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
859 struct mmc_card *oldcard)
860 {
861 struct mmc_card *card;
862 int err;
863 u32 cid[4];
864 u32 rocr = 0;
865
866 BUG_ON(!host);
867 WARN_ON(!host->claimed);
868
869 err = mmc_sd_get_cid(host, ocr, cid, &rocr);
870 if (err)
871 return err;
872
873 if (oldcard) {
874 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
875 return -ENOENT;
876
877 card = oldcard;
878 } else {
879 /*
880 * Allocate card structure.
881 */
882 card = mmc_alloc_card(host, &sd_type);
883 if (IS_ERR(card))
884 return PTR_ERR(card);
885
886 card->type = MMC_TYPE_SD;
887 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
888 }
889
890 /*
891 * For native busses: get card RCA and quit open drain mode.
892 */
893 if (!mmc_host_is_spi(host)) {
894 err = mmc_send_relative_addr(host, &card->rca);
895 if (err)
896 return err;
897
898 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
899 }
900
901 if (!oldcard) {
902 err = mmc_sd_get_csd(host, card);
903 if (err)
904 return err;
905
906 mmc_decode_cid(card);
907 }
908
909 /*
910 * Select card, as all following commands rely on that.
911 */
912 if (!mmc_host_is_spi(host)) {
913 err = mmc_select_card(card);
914 if (err)
915 return err;
916 }
917
918 err = mmc_sd_setup_card(host, card, oldcard != NULL);
919 if (err)
920 goto free_card;
921
922 /* Initialization sequence for UHS-I cards */
923 if (rocr & SD_ROCR_S18A) {
924 err = mmc_sd_init_uhs_card(card);
925 if (err)
926 goto free_card;
927
928 /* Card is an ultra-high-speed card */
929 mmc_sd_card_set_uhs(card);
930
931 /*
932 * Since initialization is now complete, enable preset
933 * value registers for UHS-I cards.
934 */
935 if (host->ops->enable_preset_value)
936 host->ops->enable_preset_value(host, true);
937 } else {
938 /*
939 * Attempt to change to high-speed (if supported)
940 */
941 err = mmc_sd_switch_hs(card);
942 if (err > 0)
943 mmc_sd_go_highspeed(card);
944 else if (err)
945 goto free_card;
946
947 /*
948 * Set bus speed.
949 */
950 mmc_set_clock(host, mmc_sd_get_max_clock(card));
951
952 /*
953 * Switch to wider bus (if supported).
954 */
955 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
956 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
957 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
958 if (err)
959 goto free_card;
960
961 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
962 }
963 }
964
965 host->card = card;
966 return 0;
967
968 free_card:
969 if (!oldcard)
970 mmc_remove_card(card);
971
972 return err;
973 }
974
975 /*
976 * Host is being removed. Free up the current card.
977 */
978 static void mmc_sd_remove(struct mmc_host *host)
979 {
980 BUG_ON(!host);
981 BUG_ON(!host->card);
982
983 mmc_remove_card(host->card);
984 host->card = NULL;
985 }
986
987 /*
988 * Card detection callback from host.
989 */
990 static void mmc_sd_detect(struct mmc_host *host)
991 {
992 int err;
993
994 BUG_ON(!host);
995 BUG_ON(!host->card);
996
997 mmc_claim_host(host);
998
999 /*
1000 * Just check if our card has been removed.
1001 */
1002 err = mmc_send_status(host->card, NULL);
1003
1004 mmc_release_host(host);
1005
1006 if (err) {
1007 mmc_sd_remove(host);
1008
1009 mmc_claim_host(host);
1010 mmc_detach_bus(host);
1011 mmc_release_host(host);
1012 }
1013 }
1014
1015 /*
1016 * Suspend callback from host.
1017 */
1018 static int mmc_sd_suspend(struct mmc_host *host)
1019 {
1020 BUG_ON(!host);
1021 BUG_ON(!host->card);
1022
1023 mmc_claim_host(host);
1024 if (!mmc_host_is_spi(host))
1025 mmc_deselect_cards(host);
1026 host->card->state &= ~MMC_STATE_HIGHSPEED;
1027 mmc_release_host(host);
1028
1029 return 0;
1030 }
1031
1032 /*
1033 * Resume callback from host.
1034 *
1035 * This function tries to determine if the same card is still present
1036 * and, if so, restore all state to it.
1037 */
1038 static int mmc_sd_resume(struct mmc_host *host)
1039 {
1040 int err;
1041
1042 BUG_ON(!host);
1043 BUG_ON(!host->card);
1044
1045 mmc_claim_host(host);
1046 err = mmc_sd_init_card(host, host->ocr, host->card);
1047 mmc_release_host(host);
1048
1049 return err;
1050 }
1051
1052 static int mmc_sd_power_restore(struct mmc_host *host)
1053 {
1054 int ret;
1055
1056 host->card->state &= ~MMC_STATE_HIGHSPEED;
1057 mmc_claim_host(host);
1058 ret = mmc_sd_init_card(host, host->ocr, host->card);
1059 mmc_release_host(host);
1060
1061 return ret;
1062 }
1063
1064 static const struct mmc_bus_ops mmc_sd_ops = {
1065 .remove = mmc_sd_remove,
1066 .detect = mmc_sd_detect,
1067 .suspend = NULL,
1068 .resume = NULL,
1069 .power_restore = mmc_sd_power_restore,
1070 };
1071
1072 static const struct mmc_bus_ops mmc_sd_ops_unsafe = {
1073 .remove = mmc_sd_remove,
1074 .detect = mmc_sd_detect,
1075 .suspend = mmc_sd_suspend,
1076 .resume = mmc_sd_resume,
1077 .power_restore = mmc_sd_power_restore,
1078 };
1079
1080 static void mmc_sd_attach_bus_ops(struct mmc_host *host)
1081 {
1082 const struct mmc_bus_ops *bus_ops;
1083
1084 if (!mmc_card_is_removable(host))
1085 bus_ops = &mmc_sd_ops_unsafe;
1086 else
1087 bus_ops = &mmc_sd_ops;
1088 mmc_attach_bus(host, bus_ops);
1089 }
1090
1091 /*
1092 * Starting point for SD card init.
1093 */
1094 int mmc_attach_sd(struct mmc_host *host)
1095 {
1096 int err;
1097 u32 ocr;
1098
1099 BUG_ON(!host);
1100 WARN_ON(!host->claimed);
1101
1102 /* Make sure we are at 3.3V signalling voltage */
1103 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, false);
1104 if (err)
1105 return err;
1106
1107 /* Disable preset value enable if already set since last time */
1108 if (host->ops->enable_preset_value)
1109 host->ops->enable_preset_value(host, false);
1110
1111 err = mmc_send_app_op_cond(host, 0, &ocr);
1112 if (err)
1113 return err;
1114
1115 mmc_sd_attach_bus_ops(host);
1116 if (host->ocr_avail_sd)
1117 host->ocr_avail = host->ocr_avail_sd;
1118
1119 /*
1120 * We need to get OCR a different way for SPI.
1121 */
1122 if (mmc_host_is_spi(host)) {
1123 mmc_go_idle(host);
1124
1125 err = mmc_spi_read_ocr(host, 0, &ocr);
1126 if (err)
1127 goto err;
1128 }
1129
1130 /*
1131 * Sanity check the voltages that the card claims to
1132 * support.
1133 */
1134 if (ocr & 0x7F) {
1135 printk(KERN_WARNING "%s: card claims to support voltages "
1136 "below the defined range. These will be ignored.\n",
1137 mmc_hostname(host));
1138 ocr &= ~0x7F;
1139 }
1140
1141 if ((ocr & MMC_VDD_165_195) &&
1142 !(host->ocr_avail_sd & MMC_VDD_165_195)) {
1143 printk(KERN_WARNING "%s: SD card claims to support the "
1144 "incompletely defined 'low voltage range'. This "
1145 "will be ignored.\n", mmc_hostname(host));
1146 ocr &= ~MMC_VDD_165_195;
1147 }
1148
1149 host->ocr = mmc_select_voltage(host, ocr);
1150
1151 /*
1152 * Can we support the voltage(s) of the card(s)?
1153 */
1154 if (!host->ocr) {
1155 err = -EINVAL;
1156 goto err;
1157 }
1158
1159 /*
1160 * Detect and init the card.
1161 */
1162 err = mmc_sd_init_card(host, host->ocr, NULL);
1163 if (err)
1164 goto err;
1165
1166 mmc_release_host(host);
1167 err = mmc_add_card(host->card);
1168 mmc_claim_host(host);
1169 if (err)
1170 goto remove_card;
1171
1172 return 0;
1173
1174 remove_card:
1175 mmc_release_host(host);
1176 mmc_remove_card(host->card);
1177 host->card = NULL;
1178 mmc_claim_host(host);
1179 err:
1180 mmc_detach_bus(host);
1181
1182 printk(KERN_ERR "%s: error %d whilst initialising SD card\n",
1183 mmc_hostname(host), err);
1184
1185 return err;
1186 }
1187
linux-next