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PM / sleep: Asynchronous threads for suspend_noirq
[linux/fpc-iii.git] / drivers / mmc / core / sd.c
blob692fdb177294c242f3df6c9e1313df0584f100b3
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/sizes.h>
15 #include <linux/slab.h>
16 #include <linux/stat.h>
17 #include <linux/pm_runtime.h>
18
19 #include <linux/mmc/host.h>
20 #include <linux/mmc/card.h>
21 #include <linux/mmc/mmc.h>
22 #include <linux/mmc/sd.h>
23
24 #include "core.h"
25 #include "bus.h"
26 #include "mmc_ops.h"
27 #include "sd.h"
28 #include "sd_ops.h"
29
30 static const unsigned int tran_exp[] = {
31 10000, 100000, 1000000, 10000000,
32 0, 0, 0, 0
33 };
34
35 static const unsigned char tran_mant[] = {
36 0, 10, 12, 13, 15, 20, 25, 30,
37 35, 40, 45, 50, 55, 60, 70, 80,
38 };
39
40 static const unsigned int tacc_exp[] = {
41 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
42 };
43
44 static const unsigned int tacc_mant[] = {
45 0, 10, 12, 13, 15, 20, 25, 30,
46 35, 40, 45, 50, 55, 60, 70, 80,
47 };
48
49 static const unsigned int sd_au_size[] = {
50 0, SZ_16K / 512, SZ_32K / 512, SZ_64K / 512,
51 SZ_128K / 512, SZ_256K / 512, SZ_512K / 512, SZ_1M / 512,
52 SZ_2M / 512, SZ_4M / 512, SZ_8M / 512, (SZ_8M + SZ_4M) / 512,
53 SZ_16M / 512, (SZ_16M + SZ_8M) / 512, SZ_32M / 512, SZ_64M / 512,
54 };
55
56 #define UNSTUFF_BITS(resp,start,size) \
57 ({ \
58 const int __size = size; \
59 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
60 const int __off = 3 - ((start) / 32); \
61 const int __shft = (start) & 31; \
62 u32 __res; \
63 \
64 __res = resp[__off] >> __shft; \
65 if (__size + __shft > 32) \
66 __res |= resp[__off-1] << ((32 - __shft) % 32); \
67 __res & __mask; \
68 })
69
70 /*
71 * Given the decoded CSD structure, decode the raw CID to our CID structure.
72 */
73 void mmc_decode_cid(struct mmc_card *card)
74 {
75 u32 *resp = card->raw_cid;
76
77 memset(&card->cid, 0, sizeof(struct mmc_cid));
78
79 /*
80 * SD doesn't currently have a version field so we will
81 * have to assume we can parse this.
82 */
83 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
84 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
85 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
86 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
87 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
88 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
89 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
90 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4);
91 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4);
92 card->cid.serial = UNSTUFF_BITS(resp, 24, 32);
93 card->cid.year = UNSTUFF_BITS(resp, 12, 8);
94 card->cid.month = UNSTUFF_BITS(resp, 8, 4);
95
96 card->cid.year += 2000; /* SD cards year offset */
97 }
98
99 /*
100 * Given a 128-bit response, decode to our card CSD structure.
101 */
102 static int mmc_decode_csd(struct mmc_card *card)
103 {
104 struct mmc_csd *csd = &card->csd;
105 unsigned int e, m, csd_struct;
106 u32 *resp = card->raw_csd;
107
108 csd_struct = UNSTUFF_BITS(resp, 126, 2);
109
110 switch (csd_struct) {
111 case 0:
112 m = UNSTUFF_BITS(resp, 115, 4);
113 e = UNSTUFF_BITS(resp, 112, 3);
114 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
115 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
116
117 m = UNSTUFF_BITS(resp, 99, 4);
118 e = UNSTUFF_BITS(resp, 96, 3);
119 csd->max_dtr = tran_exp[e] * tran_mant[m];
120 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
121
122 e = UNSTUFF_BITS(resp, 47, 3);
123 m = UNSTUFF_BITS(resp, 62, 12);
124 csd->capacity = (1 + m) << (e + 2);
125
126 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
127 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
128 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
129 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
130 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
131 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
132 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
133
134 if (UNSTUFF_BITS(resp, 46, 1)) {
135 csd->erase_size = 1;
136 } else if (csd->write_blkbits >= 9) {
137 csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1;
138 csd->erase_size <<= csd->write_blkbits - 9;
139 }
140 break;
141 case 1:
142 /*
143 * This is a block-addressed SDHC or SDXC card. Most
144 * interesting fields are unused and have fixed
145 * values. To avoid getting tripped by buggy cards,
146 * we assume those fixed values ourselves.
147 */
148 mmc_card_set_blockaddr(card);
149
150 csd->tacc_ns = 0; /* Unused */
151 csd->tacc_clks = 0; /* Unused */
152
153 m = UNSTUFF_BITS(resp, 99, 4);
154 e = UNSTUFF_BITS(resp, 96, 3);
155 csd->max_dtr = tran_exp[e] * tran_mant[m];
156 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
157 csd->c_size = UNSTUFF_BITS(resp, 48, 22);
158
159 /* SDXC cards have a minimum C_SIZE of 0x00FFFF */
160 if (csd->c_size >= 0xFFFF)
161 mmc_card_set_ext_capacity(card);
162
163 m = UNSTUFF_BITS(resp, 48, 22);
164 csd->capacity = (1 + m) << 10;
165
166 csd->read_blkbits = 9;
167 csd->read_partial = 0;
168 csd->write_misalign = 0;
169 csd->read_misalign = 0;
170 csd->r2w_factor = 4; /* Unused */
171 csd->write_blkbits = 9;
172 csd->write_partial = 0;
173 csd->erase_size = 1;
174 break;
175 default:
176 pr_err("%s: unrecognised CSD structure version %d\n",
177 mmc_hostname(card->host), csd_struct);
178 return -EINVAL;
179 }
180
181 card->erase_size = csd->erase_size;
182
183 return 0;
184 }
185
186 /*
187 * Given a 64-bit response, decode to our card SCR structure.
188 */
189 static int mmc_decode_scr(struct mmc_card *card)
190 {
191 struct sd_scr *scr = &card->scr;
192 unsigned int scr_struct;
193 u32 resp[4];
194
195 resp[3] = card->raw_scr[1];
196 resp[2] = card->raw_scr[0];
197
198 scr_struct = UNSTUFF_BITS(resp, 60, 4);
199 if (scr_struct != 0) {
200 pr_err("%s: unrecognised SCR structure version %d\n",
201 mmc_hostname(card->host), scr_struct);
202 return -EINVAL;
203 }
204
205 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
206 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
207 if (scr->sda_vsn == SCR_SPEC_VER_2)
208 /* Check if Physical Layer Spec v3.0 is supported */
209 scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1);
210
211 if (UNSTUFF_BITS(resp, 55, 1))
212 card->erased_byte = 0xFF;
213 else
214 card->erased_byte = 0x0;
215
216 if (scr->sda_spec3)
217 scr->cmds = UNSTUFF_BITS(resp, 32, 2);
218 return 0;
219 }
220
221 /*
222 * Fetch and process SD Status register.
223 */
224 static int mmc_read_ssr(struct mmc_card *card)
225 {
226 unsigned int au, es, et, eo;
227 int err, i;
228 u32 *ssr;
229
230 if (!(card->csd.cmdclass & CCC_APP_SPEC)) {
231 pr_warning("%s: card lacks mandatory SD Status "
232 "function.\n", mmc_hostname(card->host));
233 return 0;
234 }
235
236 ssr = kmalloc(64, GFP_KERNEL);
237 if (!ssr)
238 return -ENOMEM;
239
240 err = mmc_app_sd_status(card, ssr);
241 if (err) {
242 pr_warning("%s: problem reading SD Status "
243 "register.\n", mmc_hostname(card->host));
244 err = 0;
245 goto out;
246 }
247
248 for (i = 0; i < 16; i++)
249 ssr[i] = be32_to_cpu(ssr[i]);
250
251 /*
252 * UNSTUFF_BITS only works with four u32s so we have to offset the
253 * bitfield positions accordingly.
254 */
255 au = UNSTUFF_BITS(ssr, 428 - 384, 4);
256 if (au) {
257 if (au <= 9 || card->scr.sda_spec3) {
258 card->ssr.au = sd_au_size[au];
259 es = UNSTUFF_BITS(ssr, 408 - 384, 16);
260 et = UNSTUFF_BITS(ssr, 402 - 384, 6);
261 if (es && et) {
262 eo = UNSTUFF_BITS(ssr, 400 - 384, 2);
263 card->ssr.erase_timeout = (et * 1000) / es;
264 card->ssr.erase_offset = eo * 1000;
265 }
266 } else {
267 pr_warning("%s: SD Status: Invalid Allocation Unit size.\n",
268 mmc_hostname(card->host));
269 }
270 }
271 out:
272 kfree(ssr);
273 return err;
274 }
275
276 /*
277 * Fetches and decodes switch information
278 */
279 static int mmc_read_switch(struct mmc_card *card)
280 {
281 int err;
282 u8 *status;
283
284 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
285 return 0;
286
287 if (!(card->csd.cmdclass & CCC_SWITCH)) {
288 pr_warning("%s: card lacks mandatory switch "
289 "function, performance might suffer.\n",
290 mmc_hostname(card->host));
291 return 0;
292 }
293
294 err = -EIO;
295
296 status = kmalloc(64, GFP_KERNEL);
297 if (!status) {
298 pr_err("%s: could not allocate a buffer for "
299 "switch capabilities.\n",
300 mmc_hostname(card->host));
301 return -ENOMEM;
302 }
303
304 /*
305 * Find out the card's support bits with a mode 0 operation.
306 * The argument does not matter, as the support bits do not
307 * change with the arguments.
308 */
309 err = mmc_sd_switch(card, 0, 0, 0, status);
310 if (err) {
311 /*
312 * If the host or the card can't do the switch,
313 * fail more gracefully.
314 */
315 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
316 goto out;
317
318 pr_warning("%s: problem reading Bus Speed modes.\n",
319 mmc_hostname(card->host));
320 err = 0;
321
322 goto out;
323 }
324
325 if (status[13] & SD_MODE_HIGH_SPEED)
326 card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR;
327
328 if (card->scr.sda_spec3) {
329 card->sw_caps.sd3_bus_mode = status[13];
330 /* Driver Strengths supported by the card */
331 card->sw_caps.sd3_drv_type = status[9];
332 }
333
334 out:
335 kfree(status);
336
337 return err;
338 }
339
340 /*
341 * Test if the card supports high-speed mode and, if so, switch to it.
342 */
343 int mmc_sd_switch_hs(struct mmc_card *card)
344 {
345 int err;
346 u8 *status;
347
348 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
349 return 0;
350
351 if (!(card->csd.cmdclass & CCC_SWITCH))
352 return 0;
353
354 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
355 return 0;
356
357 if (card->sw_caps.hs_max_dtr == 0)
358 return 0;
359
360 err = -EIO;
361
362 status = kmalloc(64, GFP_KERNEL);
363 if (!status) {
364 pr_err("%s: could not allocate a buffer for "
365 "switch capabilities.\n", mmc_hostname(card->host));
366 return -ENOMEM;
367 }
368
369 err = mmc_sd_switch(card, 1, 0, 1, status);
370 if (err)
371 goto out;
372
373 if ((status[16] & 0xF) != 1) {
374 pr_warning("%s: Problem switching card "
375 "into high-speed mode!\n",
376 mmc_hostname(card->host));
377 err = 0;
378 } else {
379 err = 1;
380 }
381
382 out:
383 kfree(status);
384
385 return err;
386 }
387
388 static int sd_select_driver_type(struct mmc_card *card, u8 *status)
389 {
390 int host_drv_type = SD_DRIVER_TYPE_B;
391 int card_drv_type = SD_DRIVER_TYPE_B;
392 int drive_strength;
393 int err;
394
395 /*
396 * If the host doesn't support any of the Driver Types A,C or D,
397 * or there is no board specific handler then default Driver
398 * Type B is used.
399 */
400 if (!(card->host->caps & (MMC_CAP_DRIVER_TYPE_A | MMC_CAP_DRIVER_TYPE_C
401 | MMC_CAP_DRIVER_TYPE_D)))
402 return 0;
403
404 if (!card->host->ops->select_drive_strength)
405 return 0;
406
407 if (card->host->caps & MMC_CAP_DRIVER_TYPE_A)
408 host_drv_type |= SD_DRIVER_TYPE_A;
409
410 if (card->host->caps & MMC_CAP_DRIVER_TYPE_C)
411 host_drv_type |= SD_DRIVER_TYPE_C;
412
413 if (card->host->caps & MMC_CAP_DRIVER_TYPE_D)
414 host_drv_type |= SD_DRIVER_TYPE_D;
415
416 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A)
417 card_drv_type |= SD_DRIVER_TYPE_A;
418
419 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
420 card_drv_type |= SD_DRIVER_TYPE_C;
421
422 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D)
423 card_drv_type |= SD_DRIVER_TYPE_D;
424
425 /*
426 * The drive strength that the hardware can support
427 * depends on the board design. Pass the appropriate
428 * information and let the hardware specific code
429 * return what is possible given the options
430 */
431 mmc_host_clk_hold(card->host);
432 drive_strength = card->host->ops->select_drive_strength(
433 card->sw_caps.uhs_max_dtr,
434 host_drv_type, card_drv_type);
435 mmc_host_clk_release(card->host);
436
437 err = mmc_sd_switch(card, 1, 2, drive_strength, status);
438 if (err)
439 return err;
440
441 if ((status[15] & 0xF) != drive_strength) {
442 pr_warning("%s: Problem setting drive strength!\n",
443 mmc_hostname(card->host));
444 return 0;
445 }
446
447 mmc_set_driver_type(card->host, drive_strength);
448
449 return 0;
450 }
451
452 static void sd_update_bus_speed_mode(struct mmc_card *card)
453 {
454 /*
455 * If the host doesn't support any of the UHS-I modes, fallback on
456 * default speed.
457 */
458 if (!mmc_host_uhs(card->host)) {
459 card->sd_bus_speed = 0;
460 return;
461 }
462
463 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
464 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
465 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
466 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
467 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
468 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
469 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
470 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
471 SD_MODE_UHS_SDR50)) {
472 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
473 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
474 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
475 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
476 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
477 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
478 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
479 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
480 SD_MODE_UHS_SDR12)) {
481 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
482 }
483 }
484
485 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status)
486 {
487 int err;
488 unsigned int timing = 0;
489
490 switch (card->sd_bus_speed) {
491 case UHS_SDR104_BUS_SPEED:
492 timing = MMC_TIMING_UHS_SDR104;
493 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
494 break;
495 case UHS_DDR50_BUS_SPEED:
496 timing = MMC_TIMING_UHS_DDR50;
497 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
498 break;
499 case UHS_SDR50_BUS_SPEED:
500 timing = MMC_TIMING_UHS_SDR50;
501 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
502 break;
503 case UHS_SDR25_BUS_SPEED:
504 timing = MMC_TIMING_UHS_SDR25;
505 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
506 break;
507 case UHS_SDR12_BUS_SPEED:
508 timing = MMC_TIMING_UHS_SDR12;
509 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
510 break;
511 default:
512 return 0;
513 }
514
515 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status);
516 if (err)
517 return err;
518
519 if ((status[16] & 0xF) != card->sd_bus_speed)
520 pr_warning("%s: Problem setting bus speed mode!\n",
521 mmc_hostname(card->host));
522 else {
523 mmc_set_timing(card->host, timing);
524 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
525 }
526
527 return 0;
528 }
529
530 /* Get host's max current setting at its current voltage */
531 static u32 sd_get_host_max_current(struct mmc_host *host)
532 {
533 u32 voltage, max_current;
534
535 voltage = 1 << host->ios.vdd;
536 switch (voltage) {
537 case MMC_VDD_165_195:
538 max_current = host->max_current_180;
539 break;
540 case MMC_VDD_29_30:
541 case MMC_VDD_30_31:
542 max_current = host->max_current_300;
543 break;
544 case MMC_VDD_32_33:
545 case MMC_VDD_33_34:
546 max_current = host->max_current_330;
547 break;
548 default:
549 max_current = 0;
550 }
551
552 return max_current;
553 }
554
555 static int sd_set_current_limit(struct mmc_card *card, u8 *status)
556 {
557 int current_limit = SD_SET_CURRENT_NO_CHANGE;
558 int err;
559 u32 max_current;
560
561 /*
562 * Current limit switch is only defined for SDR50, SDR104, and DDR50
563 * bus speed modes. For other bus speed modes, we do not change the
564 * current limit.
565 */
566 if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) &&
567 (card->sd_bus_speed != UHS_SDR104_BUS_SPEED) &&
568 (card->sd_bus_speed != UHS_DDR50_BUS_SPEED))
569 return 0;
570
571 /*
572 * Host has different current capabilities when operating at
573 * different voltages, so find out its max current first.
574 */
575 max_current = sd_get_host_max_current(card->host);
576
577 /*
578 * We only check host's capability here, if we set a limit that is
579 * higher than the card's maximum current, the card will be using its
580 * maximum current, e.g. if the card's maximum current is 300ma, and
581 * when we set current limit to 200ma, the card will draw 200ma, and
582 * when we set current limit to 400/600/800ma, the card will draw its
583 * maximum 300ma from the host.
584 */
585 if (max_current >= 800)
586 current_limit = SD_SET_CURRENT_LIMIT_800;
587 else if (max_current >= 600)
588 current_limit = SD_SET_CURRENT_LIMIT_600;
589 else if (max_current >= 400)
590 current_limit = SD_SET_CURRENT_LIMIT_400;
591 else if (max_current >= 200)
592 current_limit = SD_SET_CURRENT_LIMIT_200;
593
594 if (current_limit != SD_SET_CURRENT_NO_CHANGE) {
595 err = mmc_sd_switch(card, 1, 3, current_limit, status);
596 if (err)
597 return err;
598
599 if (((status[15] >> 4) & 0x0F) != current_limit)
600 pr_warning("%s: Problem setting current limit!\n",
601 mmc_hostname(card->host));
602
603 }
604
605 return 0;
606 }
607
608 /*
609 * UHS-I specific initialization procedure
610 */
611 static int mmc_sd_init_uhs_card(struct mmc_card *card)
612 {
613 int err;
614 u8 *status;
615
616 if (!card->scr.sda_spec3)
617 return 0;
618
619 if (!(card->csd.cmdclass & CCC_SWITCH))
620 return 0;
621
622 status = kmalloc(64, GFP_KERNEL);
623 if (!status) {
624 pr_err("%s: could not allocate a buffer for "
625 "switch capabilities.\n", mmc_hostname(card->host));
626 return -ENOMEM;
627 }
628
629 /* Set 4-bit bus width */
630 if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
631 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
632 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
633 if (err)
634 goto out;
635
636 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
637 }
638
639 /*
640 * Select the bus speed mode depending on host
641 * and card capability.
642 */
643 sd_update_bus_speed_mode(card);
644
645 /* Set the driver strength for the card */
646 err = sd_select_driver_type(card, status);
647 if (err)
648 goto out;
649
650 /* Set current limit for the card */
651 err = sd_set_current_limit(card, status);
652 if (err)
653 goto out;
654
655 /* Set bus speed mode of the card */
656 err = sd_set_bus_speed_mode(card, status);
657 if (err)
658 goto out;
659
660 /*
661 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
662 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
663 */
664 if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning &&
665 (card->sd_bus_speed == UHS_SDR50_BUS_SPEED ||
666 card->sd_bus_speed == UHS_SDR104_BUS_SPEED)) {
667 mmc_host_clk_hold(card->host);
668 err = card->host->ops->execute_tuning(card->host,
669 MMC_SEND_TUNING_BLOCK);
670 mmc_host_clk_release(card->host);
671 }
672
673 out:
674 kfree(status);
675
676 return err;
677 }
678
679 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
680 card->raw_cid[2], card->raw_cid[3]);
681 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
682 card->raw_csd[2], card->raw_csd[3]);
683 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
684 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
685 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
686 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
687 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
688 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
689 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
690 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
691 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
692 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
693
694
695 static struct attribute *sd_std_attrs[] = {
696 &dev_attr_cid.attr,
697 &dev_attr_csd.attr,
698 &dev_attr_scr.attr,
699 &dev_attr_date.attr,
700 &dev_attr_erase_size.attr,
701 &dev_attr_preferred_erase_size.attr,
702 &dev_attr_fwrev.attr,
703 &dev_attr_hwrev.attr,
704 &dev_attr_manfid.attr,
705 &dev_attr_name.attr,
706 &dev_attr_oemid.attr,
707 &dev_attr_serial.attr,
708 NULL,
709 };
710
711 static struct attribute_group sd_std_attr_group = {
712 .attrs = sd_std_attrs,
713 };
714
715 static const struct attribute_group *sd_attr_groups[] = {
716 &sd_std_attr_group,
717 NULL,
718 };
719
720 struct device_type sd_type = {
721 .groups = sd_attr_groups,
722 };
723
724 /*
725 * Fetch CID from card.
726 */
727 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
728 {
729 int err;
730 u32 max_current;
731 int retries = 10;
732 u32 pocr = ocr;
733
734 try_again:
735 if (!retries) {
736 ocr &= ~SD_OCR_S18R;
737 pr_warning("%s: Skipping voltage switch\n",
738 mmc_hostname(host));
739 }
740
741 /*
742 * Since we're changing the OCR value, we seem to
743 * need to tell some cards to go back to the idle
744 * state. We wait 1ms to give cards time to
745 * respond.
746 */
747 mmc_go_idle(host);
748
749 /*
750 * If SD_SEND_IF_COND indicates an SD 2.0
751 * compliant card and we should set bit 30
752 * of the ocr to indicate that we can handle
753 * block-addressed SDHC cards.
754 */
755 err = mmc_send_if_cond(host, ocr);
756 if (!err)
757 ocr |= SD_OCR_CCS;
758
759 /*
760 * If the host supports one of UHS-I modes, request the card
761 * to switch to 1.8V signaling level. If the card has failed
762 * repeatedly to switch however, skip this.
763 */
764 if (retries && mmc_host_uhs(host))
765 ocr |= SD_OCR_S18R;
766
767 /*
768 * If the host can supply more than 150mA at current voltage,
769 * XPC should be set to 1.
770 */
771 max_current = sd_get_host_max_current(host);
772 if (max_current > 150)
773 ocr |= SD_OCR_XPC;
774
775 err = mmc_send_app_op_cond(host, ocr, rocr);
776 if (err)
777 return err;
778
779 /*
780 * In case CCS and S18A in the response is set, start Signal Voltage
781 * Switch procedure. SPI mode doesn't support CMD11.
782 */
783 if (!mmc_host_is_spi(host) && rocr &&
784 ((*rocr & 0x41000000) == 0x41000000)) {
785 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
786 pocr);
787 if (err == -EAGAIN) {
788 retries--;
789 goto try_again;
790 } else if (err) {
791 retries = 0;
792 goto try_again;
793 }
794 }
795
796 if (mmc_host_is_spi(host))
797 err = mmc_send_cid(host, cid);
798 else
799 err = mmc_all_send_cid(host, cid);
800
801 return err;
802 }
803
804 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card)
805 {
806 int err;
807
808 /*
809 * Fetch CSD from card.
810 */
811 err = mmc_send_csd(card, card->raw_csd);
812 if (err)
813 return err;
814
815 err = mmc_decode_csd(card);
816 if (err)
817 return err;
818
819 return 0;
820 }
821
822 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
823 bool reinit)
824 {
825 int err;
826
827 if (!reinit) {
828 /*
829 * Fetch SCR from card.
830 */
831 err = mmc_app_send_scr(card, card->raw_scr);
832 if (err)
833 return err;
834
835 err = mmc_decode_scr(card);
836 if (err)
837 return err;
838
839 /*
840 * Fetch and process SD Status register.
841 */
842 err = mmc_read_ssr(card);
843 if (err)
844 return err;
845
846 /* Erase init depends on CSD and SSR */
847 mmc_init_erase(card);
848
849 /*
850 * Fetch switch information from card.
851 */
852 err = mmc_read_switch(card);
853 if (err)
854 return err;
855 }
856
857 /*
858 * For SPI, enable CRC as appropriate.
859 * This CRC enable is located AFTER the reading of the
860 * card registers because some SDHC cards are not able
861 * to provide valid CRCs for non-512-byte blocks.
862 */
863 if (mmc_host_is_spi(host)) {
864 err = mmc_spi_set_crc(host, use_spi_crc);
865 if (err)
866 return err;
867 }
868
869 /*
870 * Check if read-only switch is active.
871 */
872 if (!reinit) {
873 int ro = -1;
874
875 if (host->ops->get_ro) {
876 mmc_host_clk_hold(card->host);
877 ro = host->ops->get_ro(host);
878 mmc_host_clk_release(card->host);
879 }
880
881 if (ro < 0) {
882 pr_warning("%s: host does not "
883 "support reading read-only "
884 "switch. assuming write-enable.\n",
885 mmc_hostname(host));
886 } else if (ro > 0) {
887 mmc_card_set_readonly(card);
888 }
889 }
890
891 return 0;
892 }
893
894 unsigned mmc_sd_get_max_clock(struct mmc_card *card)
895 {
896 unsigned max_dtr = (unsigned int)-1;
897
898 if (mmc_card_highspeed(card)) {
899 if (max_dtr > card->sw_caps.hs_max_dtr)
900 max_dtr = card->sw_caps.hs_max_dtr;
901 } else if (max_dtr > card->csd.max_dtr) {
902 max_dtr = card->csd.max_dtr;
903 }
904
905 return max_dtr;
906 }
907
908 void mmc_sd_go_highspeed(struct mmc_card *card)
909 {
910 mmc_card_set_highspeed(card);
911 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
912 }
913
914 /*
915 * Handle the detection and initialisation of a card.
916 *
917 * In the case of a resume, "oldcard" will contain the card
918 * we're trying to reinitialise.
919 */
920 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
921 struct mmc_card *oldcard)
922 {
923 struct mmc_card *card;
924 int err;
925 u32 cid[4];
926 u32 rocr = 0;
927
928 BUG_ON(!host);
929 WARN_ON(!host->claimed);
930
931 err = mmc_sd_get_cid(host, ocr, cid, &rocr);
932 if (err)
933 return err;
934
935 if (oldcard) {
936 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
937 return -ENOENT;
938
939 card = oldcard;
940 } else {
941 /*
942 * Allocate card structure.
943 */
944 card = mmc_alloc_card(host, &sd_type);
945 if (IS_ERR(card))
946 return PTR_ERR(card);
947
948 card->ocr = ocr;
949 card->type = MMC_TYPE_SD;
950 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
951 }
952
953 /*
954 * For native busses: get card RCA and quit open drain mode.
955 */
956 if (!mmc_host_is_spi(host)) {
957 err = mmc_send_relative_addr(host, &card->rca);
958 if (err)
959 goto free_card;
960 }
961
962 if (!oldcard) {
963 err = mmc_sd_get_csd(host, card);
964 if (err)
965 goto free_card;
966
967 mmc_decode_cid(card);
968 }
969
970 /*
971 * Select card, as all following commands rely on that.
972 */
973 if (!mmc_host_is_spi(host)) {
974 err = mmc_select_card(card);
975 if (err)
976 goto free_card;
977 }
978
979 err = mmc_sd_setup_card(host, card, oldcard != NULL);
980 if (err)
981 goto free_card;
982
983 /* Initialization sequence for UHS-I cards */
984 if (rocr & SD_ROCR_S18A) {
985 err = mmc_sd_init_uhs_card(card);
986 if (err)
987 goto free_card;
988
989 /* Card is an ultra-high-speed card */
990 mmc_card_set_uhs(card);
991 } else {
992 /*
993 * Attempt to change to high-speed (if supported)
994 */
995 err = mmc_sd_switch_hs(card);
996 if (err > 0)
997 mmc_sd_go_highspeed(card);
998 else if (err)
999 goto free_card;
1000
1001 /*
1002 * Set bus speed.
1003 */
1004 mmc_set_clock(host, mmc_sd_get_max_clock(card));
1005
1006 /*
1007 * Switch to wider bus (if supported).
1008 */
1009 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
1010 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
1011 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
1012 if (err)
1013 goto free_card;
1014
1015 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
1016 }
1017 }
1018
1019 host->card = card;
1020 return 0;
1021
1022 free_card:
1023 if (!oldcard)
1024 mmc_remove_card(card);
1025
1026 return err;
1027 }
1028
1029 /*
1030 * Host is being removed. Free up the current card.
1031 */
1032 static void mmc_sd_remove(struct mmc_host *host)
1033 {
1034 BUG_ON(!host);
1035 BUG_ON(!host->card);
1036
1037 mmc_remove_card(host->card);
1038 host->card = NULL;
1039 }
1040
1041 /*
1042 * Card detection - card is alive.
1043 */
1044 static int mmc_sd_alive(struct mmc_host *host)
1045 {
1046 return mmc_send_status(host->card, NULL);
1047 }
1048
1049 /*
1050 * Card detection callback from host.
1051 */
1052 static void mmc_sd_detect(struct mmc_host *host)
1053 {
1054 int err;
1055
1056 BUG_ON(!host);
1057 BUG_ON(!host->card);
1058
1059 mmc_get_card(host->card);
1060
1061 /*
1062 * Just check if our card has been removed.
1063 */
1064 err = _mmc_detect_card_removed(host);
1065
1066 mmc_put_card(host->card);
1067
1068 if (err) {
1069 mmc_sd_remove(host);
1070
1071 mmc_claim_host(host);
1072 mmc_detach_bus(host);
1073 mmc_power_off(host);
1074 mmc_release_host(host);
1075 }
1076 }
1077
1078 static int _mmc_sd_suspend(struct mmc_host *host)
1079 {
1080 int err = 0;
1081
1082 BUG_ON(!host);
1083 BUG_ON(!host->card);
1084
1085 mmc_claim_host(host);
1086
1087 if (mmc_card_suspended(host->card))
1088 goto out;
1089
1090 if (!mmc_host_is_spi(host))
1091 err = mmc_deselect_cards(host);
1092 host->card->state &= ~MMC_STATE_HIGHSPEED;
1093 if (!err) {
1094 mmc_power_off(host);
1095 mmc_card_set_suspended(host->card);
1096 }
1097
1098 out:
1099 mmc_release_host(host);
1100 return err;
1101 }
1102
1103 /*
1104 * Callback for suspend
1105 */
1106 static int mmc_sd_suspend(struct mmc_host *host)
1107 {
1108 int err;
1109
1110 err = _mmc_sd_suspend(host);
1111 if (!err) {
1112 pm_runtime_disable(&host->card->dev);
1113 pm_runtime_set_suspended(&host->card->dev);
1114 }
1115
1116 return err;
1117 }
1118
1119 /*
1120 * This function tries to determine if the same card is still present
1121 * and, if so, restore all state to it.
1122 */
1123 static int _mmc_sd_resume(struct mmc_host *host)
1124 {
1125 int err = 0;
1126
1127 BUG_ON(!host);
1128 BUG_ON(!host->card);
1129
1130 mmc_claim_host(host);
1131
1132 if (!mmc_card_suspended(host->card))
1133 goto out;
1134
1135 mmc_power_up(host, host->card->ocr);
1136 err = mmc_sd_init_card(host, host->card->ocr, host->card);
1137 mmc_card_clr_suspended(host->card);
1138
1139 out:
1140 mmc_release_host(host);
1141 return err;
1142 }
1143
1144 /*
1145 * Callback for resume
1146 */
1147 static int mmc_sd_resume(struct mmc_host *host)
1148 {
1149 int err = 0;
1150
1151 if (!(host->caps & MMC_CAP_RUNTIME_RESUME)) {
1152 err = _mmc_sd_resume(host);
1153 pm_runtime_set_active(&host->card->dev);
1154 pm_runtime_mark_last_busy(&host->card->dev);
1155 }
1156 pm_runtime_enable(&host->card->dev);
1157
1158 return err;
1159 }
1160
1161 /*
1162 * Callback for runtime_suspend.
1163 */
1164 static int mmc_sd_runtime_suspend(struct mmc_host *host)
1165 {
1166 int err;
1167
1168 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
1169 return 0;
1170
1171 err = _mmc_sd_suspend(host);
1172 if (err)
1173 pr_err("%s: error %d doing aggessive suspend\n",
1174 mmc_hostname(host), err);
1175
1176 return err;
1177 }
1178
1179 /*
1180 * Callback for runtime_resume.
1181 */
1182 static int mmc_sd_runtime_resume(struct mmc_host *host)
1183 {
1184 int err;
1185
1186 if (!(host->caps & (MMC_CAP_AGGRESSIVE_PM | MMC_CAP_RUNTIME_RESUME)))
1187 return 0;
1188
1189 err = _mmc_sd_resume(host);
1190 if (err)
1191 pr_err("%s: error %d doing aggessive resume\n",
1192 mmc_hostname(host), err);
1193
1194 return 0;
1195 }
1196
1197 static int mmc_sd_power_restore(struct mmc_host *host)
1198 {
1199 int ret;
1200
1201 host->card->state &= ~MMC_STATE_HIGHSPEED;
1202 mmc_claim_host(host);
1203 ret = mmc_sd_init_card(host, host->card->ocr, host->card);
1204 mmc_release_host(host);
1205
1206 return ret;
1207 }
1208
1209 static const struct mmc_bus_ops mmc_sd_ops = {
1210 .remove = mmc_sd_remove,
1211 .detect = mmc_sd_detect,
1212 .suspend = NULL,
1213 .resume = NULL,
1214 .power_restore = mmc_sd_power_restore,
1215 .alive = mmc_sd_alive,
1216 .shutdown = mmc_sd_suspend,
1217 };
1218
1219 static const struct mmc_bus_ops mmc_sd_ops_unsafe = {
1220 .remove = mmc_sd_remove,
1221 .detect = mmc_sd_detect,
1222 .runtime_suspend = mmc_sd_runtime_suspend,
1223 .runtime_resume = mmc_sd_runtime_resume,
1224 .suspend = mmc_sd_suspend,
1225 .resume = mmc_sd_resume,
1226 .power_restore = mmc_sd_power_restore,
1227 .alive = mmc_sd_alive,
1228 .shutdown = mmc_sd_suspend,
1229 };
1230
1231 static void mmc_sd_attach_bus_ops(struct mmc_host *host)
1232 {
1233 const struct mmc_bus_ops *bus_ops;
1234
1235 if (!mmc_card_is_removable(host))
1236 bus_ops = &mmc_sd_ops_unsafe;
1237 else
1238 bus_ops = &mmc_sd_ops;
1239 mmc_attach_bus(host, bus_ops);
1240 }
1241
1242 /*
1243 * Starting point for SD card init.
1244 */
1245 int mmc_attach_sd(struct mmc_host *host)
1246 {
1247 int err;
1248 u32 ocr, rocr;
1249
1250 BUG_ON(!host);
1251 WARN_ON(!host->claimed);
1252
1253 err = mmc_send_app_op_cond(host, 0, &ocr);
1254 if (err)
1255 return err;
1256
1257 mmc_sd_attach_bus_ops(host);
1258 if (host->ocr_avail_sd)
1259 host->ocr_avail = host->ocr_avail_sd;
1260
1261 /*
1262 * We need to get OCR a different way for SPI.
1263 */
1264 if (mmc_host_is_spi(host)) {
1265 mmc_go_idle(host);
1266
1267 err = mmc_spi_read_ocr(host, 0, &ocr);
1268 if (err)
1269 goto err;
1270 }
1271
1272 rocr = mmc_select_voltage(host, ocr);
1273
1274 /*
1275 * Can we support the voltage(s) of the card(s)?
1276 */
1277 if (!rocr) {
1278 err = -EINVAL;
1279 goto err;
1280 }
1281
1282 /*
1283 * Detect and init the card.
1284 */
1285 err = mmc_sd_init_card(host, rocr, NULL);
1286 if (err)
1287 goto err;
1288
1289 mmc_release_host(host);
1290 err = mmc_add_card(host->card);
1291 mmc_claim_host(host);
1292 if (err)
1293 goto remove_card;
1294
1295 return 0;
1296
1297 remove_card:
1298 mmc_release_host(host);
1299 mmc_remove_card(host->card);
1300 host->card = NULL;
1301 mmc_claim_host(host);
1302 err:
1303 mmc_detach_bus(host);
1304
1305 pr_err("%s: error %d whilst initialising SD card\n",
1306 mmc_hostname(host), err);
1307
1308 return err;
1309 }
1310
Linux with added FPC-III support