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mmc: Add support for disabling write-protect detection
[deliverable/linux.git] / drivers / mmc / core / sd.c
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->dsr_imp = UNSTUFF_BITS(resp, 76, 1);
131 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
132 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
133 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
134
135 if (UNSTUFF_BITS(resp, 46, 1)) {
136 csd->erase_size = 1;
137 } else if (csd->write_blkbits >= 9) {
138 csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1;
139 csd->erase_size <<= csd->write_blkbits - 9;
140 }
141 break;
142 case 1:
143 /*
144 * This is a block-addressed SDHC or SDXC card. Most
145 * interesting fields are unused and have fixed
146 * values. To avoid getting tripped by buggy cards,
147 * we assume those fixed values ourselves.
148 */
149 mmc_card_set_blockaddr(card);
150
151 csd->tacc_ns = 0; /* Unused */
152 csd->tacc_clks = 0; /* Unused */
153
154 m = UNSTUFF_BITS(resp, 99, 4);
155 e = UNSTUFF_BITS(resp, 96, 3);
156 csd->max_dtr = tran_exp[e] * tran_mant[m];
157 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
158 csd->c_size = UNSTUFF_BITS(resp, 48, 22);
159
160 /* SDXC cards have a minimum C_SIZE of 0x00FFFF */
161 if (csd->c_size >= 0xFFFF)
162 mmc_card_set_ext_capacity(card);
163
164 m = UNSTUFF_BITS(resp, 48, 22);
165 csd->capacity = (1 + m) << 10;
166
167 csd->read_blkbits = 9;
168 csd->read_partial = 0;
169 csd->write_misalign = 0;
170 csd->read_misalign = 0;
171 csd->r2w_factor = 4; /* Unused */
172 csd->write_blkbits = 9;
173 csd->write_partial = 0;
174 csd->erase_size = 1;
175 break;
176 default:
177 pr_err("%s: unrecognised CSD structure version %d\n",
178 mmc_hostname(card->host), csd_struct);
179 return -EINVAL;
180 }
181
182 card->erase_size = csd->erase_size;
183
184 return 0;
185 }
186
187 /*
188 * Given a 64-bit response, decode to our card SCR structure.
189 */
190 static int mmc_decode_scr(struct mmc_card *card)
191 {
192 struct sd_scr *scr = &card->scr;
193 unsigned int scr_struct;
194 u32 resp[4];
195
196 resp[3] = card->raw_scr[1];
197 resp[2] = card->raw_scr[0];
198
199 scr_struct = UNSTUFF_BITS(resp, 60, 4);
200 if (scr_struct != 0) {
201 pr_err("%s: unrecognised SCR structure version %d\n",
202 mmc_hostname(card->host), scr_struct);
203 return -EINVAL;
204 }
205
206 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
207 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
208 if (scr->sda_vsn == SCR_SPEC_VER_2)
209 /* Check if Physical Layer Spec v3.0 is supported */
210 scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1);
211
212 if (UNSTUFF_BITS(resp, 55, 1))
213 card->erased_byte = 0xFF;
214 else
215 card->erased_byte = 0x0;
216
217 if (scr->sda_spec3)
218 scr->cmds = UNSTUFF_BITS(resp, 32, 2);
219 return 0;
220 }
221
222 /*
223 * Fetch and process SD Status register.
224 */
225 static int mmc_read_ssr(struct mmc_card *card)
226 {
227 unsigned int au, es, et, eo;
228 int err, i;
229 u32 *ssr;
230
231 if (!(card->csd.cmdclass & CCC_APP_SPEC)) {
232 pr_warn("%s: card lacks mandatory SD Status function\n",
233 mmc_hostname(card->host));
234 return 0;
235 }
236
237 ssr = kmalloc(64, GFP_KERNEL);
238 if (!ssr)
239 return -ENOMEM;
240
241 err = mmc_app_sd_status(card, ssr);
242 if (err) {
243 pr_warn("%s: problem reading SD Status register\n",
244 mmc_hostname(card->host));
245 err = 0;
246 goto out;
247 }
248
249 for (i = 0; i < 16; i++)
250 ssr[i] = be32_to_cpu(ssr[i]);
251
252 /*
253 * UNSTUFF_BITS only works with four u32s so we have to offset the
254 * bitfield positions accordingly.
255 */
256 au = UNSTUFF_BITS(ssr, 428 - 384, 4);
257 if (au) {
258 if (au <= 9 || card->scr.sda_spec3) {
259 card->ssr.au = sd_au_size[au];
260 es = UNSTUFF_BITS(ssr, 408 - 384, 16);
261 et = UNSTUFF_BITS(ssr, 402 - 384, 6);
262 if (es && et) {
263 eo = UNSTUFF_BITS(ssr, 400 - 384, 2);
264 card->ssr.erase_timeout = (et * 1000) / es;
265 card->ssr.erase_offset = eo * 1000;
266 }
267 } else {
268 pr_warn("%s: SD Status: Invalid Allocation Unit size\n",
269 mmc_hostname(card->host));
270 }
271 }
272 out:
273 kfree(ssr);
274 return err;
275 }
276
277 /*
278 * Fetches and decodes switch information
279 */
280 static int mmc_read_switch(struct mmc_card *card)
281 {
282 int err;
283 u8 *status;
284
285 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
286 return 0;
287
288 if (!(card->csd.cmdclass & CCC_SWITCH)) {
289 pr_warn("%s: card lacks mandatory switch 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_warn("%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_warn("%s: Problem switching card into high-speed mode!\n",
375 mmc_hostname(card->host));
376 err = 0;
377 } else {
378 err = 1;
379 }
380
381 out:
382 kfree(status);
383
384 return err;
385 }
386
387 static int sd_select_driver_type(struct mmc_card *card, u8 *status)
388 {
389 int host_drv_type = SD_DRIVER_TYPE_B;
390 int card_drv_type = SD_DRIVER_TYPE_B;
391 int drive_strength;
392 int err;
393
394 /*
395 * If the host doesn't support any of the Driver Types A,C or D,
396 * or there is no board specific handler then default Driver
397 * Type B is used.
398 */
399 if (!(card->host->caps & (MMC_CAP_DRIVER_TYPE_A | MMC_CAP_DRIVER_TYPE_C
400 | MMC_CAP_DRIVER_TYPE_D)))
401 return 0;
402
403 if (!card->host->ops->select_drive_strength)
404 return 0;
405
406 if (card->host->caps & MMC_CAP_DRIVER_TYPE_A)
407 host_drv_type |= SD_DRIVER_TYPE_A;
408
409 if (card->host->caps & MMC_CAP_DRIVER_TYPE_C)
410 host_drv_type |= SD_DRIVER_TYPE_C;
411
412 if (card->host->caps & MMC_CAP_DRIVER_TYPE_D)
413 host_drv_type |= SD_DRIVER_TYPE_D;
414
415 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A)
416 card_drv_type |= SD_DRIVER_TYPE_A;
417
418 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
419 card_drv_type |= SD_DRIVER_TYPE_C;
420
421 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D)
422 card_drv_type |= SD_DRIVER_TYPE_D;
423
424 /*
425 * The drive strength that the hardware can support
426 * depends on the board design. Pass the appropriate
427 * information and let the hardware specific code
428 * return what is possible given the options
429 */
430 mmc_host_clk_hold(card->host);
431 drive_strength = card->host->ops->select_drive_strength(
432 card->sw_caps.uhs_max_dtr,
433 host_drv_type, card_drv_type);
434 mmc_host_clk_release(card->host);
435
436 err = mmc_sd_switch(card, 1, 2, drive_strength, status);
437 if (err)
438 return err;
439
440 if ((status[15] & 0xF) != drive_strength) {
441 pr_warn("%s: Problem setting drive strength!\n",
442 mmc_hostname(card->host));
443 return 0;
444 }
445
446 mmc_set_driver_type(card->host, drive_strength);
447
448 return 0;
449 }
450
451 static void sd_update_bus_speed_mode(struct mmc_card *card)
452 {
453 /*
454 * If the host doesn't support any of the UHS-I modes, fallback on
455 * default speed.
456 */
457 if (!mmc_host_uhs(card->host)) {
458 card->sd_bus_speed = 0;
459 return;
460 }
461
462 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
463 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
464 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
465 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
466 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
467 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
468 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
469 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
470 SD_MODE_UHS_SDR50)) {
471 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
472 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
473 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
474 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
475 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
476 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
477 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
478 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
479 SD_MODE_UHS_SDR12)) {
480 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
481 }
482 }
483
484 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status)
485 {
486 int err;
487 unsigned int timing = 0;
488
489 switch (card->sd_bus_speed) {
490 case UHS_SDR104_BUS_SPEED:
491 timing = MMC_TIMING_UHS_SDR104;
492 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
493 break;
494 case UHS_DDR50_BUS_SPEED:
495 timing = MMC_TIMING_UHS_DDR50;
496 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
497 break;
498 case UHS_SDR50_BUS_SPEED:
499 timing = MMC_TIMING_UHS_SDR50;
500 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
501 break;
502 case UHS_SDR25_BUS_SPEED:
503 timing = MMC_TIMING_UHS_SDR25;
504 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
505 break;
506 case UHS_SDR12_BUS_SPEED:
507 timing = MMC_TIMING_UHS_SDR12;
508 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
509 break;
510 default:
511 return 0;
512 }
513
514 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status);
515 if (err)
516 return err;
517
518 if ((status[16] & 0xF) != card->sd_bus_speed)
519 pr_warn("%s: Problem setting bus speed mode!\n",
520 mmc_hostname(card->host));
521 else {
522 mmc_set_timing(card->host, timing);
523 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
524 }
525
526 return 0;
527 }
528
529 /* Get host's max current setting at its current voltage */
530 static u32 sd_get_host_max_current(struct mmc_host *host)
531 {
532 u32 voltage, max_current;
533
534 voltage = 1 << host->ios.vdd;
535 switch (voltage) {
536 case MMC_VDD_165_195:
537 max_current = host->max_current_180;
538 break;
539 case MMC_VDD_29_30:
540 case MMC_VDD_30_31:
541 max_current = host->max_current_300;
542 break;
543 case MMC_VDD_32_33:
544 case MMC_VDD_33_34:
545 max_current = host->max_current_330;
546 break;
547 default:
548 max_current = 0;
549 }
550
551 return max_current;
552 }
553
554 static int sd_set_current_limit(struct mmc_card *card, u8 *status)
555 {
556 int current_limit = SD_SET_CURRENT_NO_CHANGE;
557 int err;
558 u32 max_current;
559
560 /*
561 * Current limit switch is only defined for SDR50, SDR104, and DDR50
562 * bus speed modes. For other bus speed modes, we do not change the
563 * current limit.
564 */
565 if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) &&
566 (card->sd_bus_speed != UHS_SDR104_BUS_SPEED) &&
567 (card->sd_bus_speed != UHS_DDR50_BUS_SPEED))
568 return 0;
569
570 /*
571 * Host has different current capabilities when operating at
572 * different voltages, so find out its max current first.
573 */
574 max_current = sd_get_host_max_current(card->host);
575
576 /*
577 * We only check host's capability here, if we set a limit that is
578 * higher than the card's maximum current, the card will be using its
579 * maximum current, e.g. if the card's maximum current is 300ma, and
580 * when we set current limit to 200ma, the card will draw 200ma, and
581 * when we set current limit to 400/600/800ma, the card will draw its
582 * maximum 300ma from the host.
583 */
584 if (max_current >= 800)
585 current_limit = SD_SET_CURRENT_LIMIT_800;
586 else if (max_current >= 600)
587 current_limit = SD_SET_CURRENT_LIMIT_600;
588 else if (max_current >= 400)
589 current_limit = SD_SET_CURRENT_LIMIT_400;
590 else if (max_current >= 200)
591 current_limit = SD_SET_CURRENT_LIMIT_200;
592
593 if (current_limit != SD_SET_CURRENT_NO_CHANGE) {
594 err = mmc_sd_switch(card, 1, 3, current_limit, status);
595 if (err)
596 return err;
597
598 if (((status[15] >> 4) & 0x0F) != current_limit)
599 pr_warn("%s: Problem setting current limit!\n",
600 mmc_hostname(card->host));
601
602 }
603
604 return 0;
605 }
606
607 /*
608 * UHS-I specific initialization procedure
609 */
610 static int mmc_sd_init_uhs_card(struct mmc_card *card)
611 {
612 int err;
613 u8 *status;
614
615 if (!card->scr.sda_spec3)
616 return 0;
617
618 if (!(card->csd.cmdclass & CCC_SWITCH))
619 return 0;
620
621 status = kmalloc(64, GFP_KERNEL);
622 if (!status) {
623 pr_err("%s: could not allocate a buffer for "
624 "switch capabilities.\n", mmc_hostname(card->host));
625 return -ENOMEM;
626 }
627
628 /* Set 4-bit bus width */
629 if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
630 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
631 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
632 if (err)
633 goto out;
634
635 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
636 }
637
638 /*
639 * Select the bus speed mode depending on host
640 * and card capability.
641 */
642 sd_update_bus_speed_mode(card);
643
644 /* Set the driver strength for the card */
645 err = sd_select_driver_type(card, status);
646 if (err)
647 goto out;
648
649 /* Set current limit for the card */
650 err = sd_set_current_limit(card, status);
651 if (err)
652 goto out;
653
654 /* Set bus speed mode of the card */
655 err = sd_set_bus_speed_mode(card, status);
656 if (err)
657 goto out;
658
659 /*
660 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
661 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
662 */
663 if (!mmc_host_is_spi(card->host) &&
664 (card->sd_bus_speed == UHS_SDR50_BUS_SPEED ||
665 card->sd_bus_speed == UHS_SDR104_BUS_SPEED))
666 err = mmc_execute_tuning(card);
667 out:
668 kfree(status);
669
670 return err;
671 }
672
673 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
674 card->raw_cid[2], card->raw_cid[3]);
675 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
676 card->raw_csd[2], card->raw_csd[3]);
677 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
678 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
679 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
680 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
681 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
682 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
683 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
684 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
685 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
686 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
687
688
689 static struct attribute *sd_std_attrs[] = {
690 &dev_attr_cid.attr,
691 &dev_attr_csd.attr,
692 &dev_attr_scr.attr,
693 &dev_attr_date.attr,
694 &dev_attr_erase_size.attr,
695 &dev_attr_preferred_erase_size.attr,
696 &dev_attr_fwrev.attr,
697 &dev_attr_hwrev.attr,
698 &dev_attr_manfid.attr,
699 &dev_attr_name.attr,
700 &dev_attr_oemid.attr,
701 &dev_attr_serial.attr,
702 NULL,
703 };
704 ATTRIBUTE_GROUPS(sd_std);
705
706 struct device_type sd_type = {
707 .groups = sd_std_groups,
708 };
709
710 /*
711 * Fetch CID from card.
712 */
713 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
714 {
715 int err;
716 u32 max_current;
717 int retries = 10;
718 u32 pocr = ocr;
719
720 try_again:
721 if (!retries) {
722 ocr &= ~SD_OCR_S18R;
723 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
724 }
725
726 /*
727 * Since we're changing the OCR value, we seem to
728 * need to tell some cards to go back to the idle
729 * state. We wait 1ms to give cards time to
730 * respond.
731 */
732 mmc_go_idle(host);
733
734 /*
735 * If SD_SEND_IF_COND indicates an SD 2.0
736 * compliant card and we should set bit 30
737 * of the ocr to indicate that we can handle
738 * block-addressed SDHC cards.
739 */
740 err = mmc_send_if_cond(host, ocr);
741 if (!err)
742 ocr |= SD_OCR_CCS;
743
744 /*
745 * If the host supports one of UHS-I modes, request the card
746 * to switch to 1.8V signaling level. If the card has failed
747 * repeatedly to switch however, skip this.
748 */
749 if (retries && mmc_host_uhs(host))
750 ocr |= SD_OCR_S18R;
751
752 /*
753 * If the host can supply more than 150mA at current voltage,
754 * XPC should be set to 1.
755 */
756 max_current = sd_get_host_max_current(host);
757 if (max_current > 150)
758 ocr |= SD_OCR_XPC;
759
760 err = mmc_send_app_op_cond(host, ocr, rocr);
761 if (err)
762 return err;
763
764 /*
765 * In case CCS and S18A in the response is set, start Signal Voltage
766 * Switch procedure. SPI mode doesn't support CMD11.
767 */
768 if (!mmc_host_is_spi(host) && rocr &&
769 ((*rocr & 0x41000000) == 0x41000000)) {
770 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
771 pocr);
772 if (err == -EAGAIN) {
773 retries--;
774 goto try_again;
775 } else if (err) {
776 retries = 0;
777 goto try_again;
778 }
779 }
780
781 if (mmc_host_is_spi(host))
782 err = mmc_send_cid(host, cid);
783 else
784 err = mmc_all_send_cid(host, cid);
785
786 return err;
787 }
788
789 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card)
790 {
791 int err;
792
793 /*
794 * Fetch CSD from card.
795 */
796 err = mmc_send_csd(card, card->raw_csd);
797 if (err)
798 return err;
799
800 err = mmc_decode_csd(card);
801 if (err)
802 return err;
803
804 return 0;
805 }
806
807 static int mmc_sd_get_ro(struct mmc_host *host)
808 {
809 int ro;
810
811 /*
812 * Some systems don't feature a write-protect pin and don't need one.
813 * E.g. because they only have micro-SD card slot. For those systems
814 * assume that the SD card is always read-write.
815 */
816 if (host->caps2 & MMC_CAP2_NO_WRITE_PROTECT)
817 return 0;
818
819 if (!host->ops->get_ro)
820 return -1;
821
822 mmc_host_clk_hold(host);
823 ro = host->ops->get_ro(host);
824 mmc_host_clk_release(host);
825
826 return ro;
827 }
828
829 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
830 bool reinit)
831 {
832 int err;
833
834 if (!reinit) {
835 /*
836 * Fetch SCR from card.
837 */
838 err = mmc_app_send_scr(card, card->raw_scr);
839 if (err)
840 return err;
841
842 err = mmc_decode_scr(card);
843 if (err)
844 return err;
845
846 /*
847 * Fetch and process SD Status register.
848 */
849 err = mmc_read_ssr(card);
850 if (err)
851 return err;
852
853 /* Erase init depends on CSD and SSR */
854 mmc_init_erase(card);
855
856 /*
857 * Fetch switch information from card.
858 */
859 err = mmc_read_switch(card);
860 if (err)
861 return err;
862 }
863
864 /*
865 * For SPI, enable CRC as appropriate.
866 * This CRC enable is located AFTER the reading of the
867 * card registers because some SDHC cards are not able
868 * to provide valid CRCs for non-512-byte blocks.
869 */
870 if (mmc_host_is_spi(host)) {
871 err = mmc_spi_set_crc(host, use_spi_crc);
872 if (err)
873 return err;
874 }
875
876 /*
877 * Check if read-only switch is active.
878 */
879 if (!reinit) {
880 int ro = mmc_sd_get_ro(host);
881
882 if (ro < 0) {
883 pr_warn("%s: host does not support reading read-only switch, assuming write-enable\n",
884 mmc_hostname(host));
885 } else if (ro > 0) {
886 mmc_card_set_readonly(card);
887 }
888 }
889
890 return 0;
891 }
892
893 unsigned mmc_sd_get_max_clock(struct mmc_card *card)
894 {
895 unsigned max_dtr = (unsigned int)-1;
896
897 if (mmc_card_hs(card)) {
898 if (max_dtr > card->sw_caps.hs_max_dtr)
899 max_dtr = card->sw_caps.hs_max_dtr;
900 } else if (max_dtr > card->csd.max_dtr) {
901 max_dtr = card->csd.max_dtr;
902 }
903
904 return max_dtr;
905 }
906
907 /*
908 * Handle the detection and initialisation of a card.
909 *
910 * In the case of a resume, "oldcard" will contain the card
911 * we're trying to reinitialise.
912 */
913 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
914 struct mmc_card *oldcard)
915 {
916 struct mmc_card *card;
917 int err;
918 u32 cid[4];
919 u32 rocr = 0;
920
921 BUG_ON(!host);
922 WARN_ON(!host->claimed);
923
924 err = mmc_sd_get_cid(host, ocr, cid, &rocr);
925 if (err)
926 return err;
927
928 if (oldcard) {
929 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
930 return -ENOENT;
931
932 card = oldcard;
933 } else {
934 /*
935 * Allocate card structure.
936 */
937 card = mmc_alloc_card(host, &sd_type);
938 if (IS_ERR(card))
939 return PTR_ERR(card);
940
941 card->ocr = ocr;
942 card->type = MMC_TYPE_SD;
943 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
944 }
945
946 /*
947 * Call the optional HC's init_card function to handle quirks.
948 */
949 if (host->ops->init_card)
950 host->ops->init_card(host, card);
951
952 /*
953 * For native busses: get card RCA and quit open drain mode.
954 */
955 if (!mmc_host_is_spi(host)) {
956 err = mmc_send_relative_addr(host, &card->rca);
957 if (err)
958 goto free_card;
959 }
960
961 if (!oldcard) {
962 err = mmc_sd_get_csd(host, card);
963 if (err)
964 goto free_card;
965
966 mmc_decode_cid(card);
967 }
968
969 /*
970 * handling only for cards supporting DSR and hosts requesting
971 * DSR configuration
972 */
973 if (card->csd.dsr_imp && host->dsr_req)
974 mmc_set_dsr(host);
975
976 /*
977 * Select card, as all following commands rely on that.
978 */
979 if (!mmc_host_is_spi(host)) {
980 err = mmc_select_card(card);
981 if (err)
982 goto free_card;
983 }
984
985 err = mmc_sd_setup_card(host, card, oldcard != NULL);
986 if (err)
987 goto free_card;
988
989 /* Initialization sequence for UHS-I cards */
990 if (rocr & SD_ROCR_S18A) {
991 err = mmc_sd_init_uhs_card(card);
992 if (err)
993 goto free_card;
994 } else {
995 /*
996 * Attempt to change to high-speed (if supported)
997 */
998 err = mmc_sd_switch_hs(card);
999 if (err > 0)
1000 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
1001 else if (err)
1002 goto free_card;
1003
1004 /*
1005 * Set bus speed.
1006 */
1007 mmc_set_clock(host, mmc_sd_get_max_clock(card));
1008
1009 /*
1010 * Switch to wider bus (if supported).
1011 */
1012 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
1013 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
1014 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
1015 if (err)
1016 goto free_card;
1017
1018 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
1019 }
1020 }
1021
1022 host->card = card;
1023 return 0;
1024
1025 free_card:
1026 if (!oldcard)
1027 mmc_remove_card(card);
1028
1029 return err;
1030 }
1031
1032 /*
1033 * Host is being removed. Free up the current card.
1034 */
1035 static void mmc_sd_remove(struct mmc_host *host)
1036 {
1037 BUG_ON(!host);
1038 BUG_ON(!host->card);
1039
1040 mmc_remove_card(host->card);
1041 host->card = NULL;
1042 }
1043
1044 /*
1045 * Card detection - card is alive.
1046 */
1047 static int mmc_sd_alive(struct mmc_host *host)
1048 {
1049 return mmc_send_status(host->card, NULL);
1050 }
1051
1052 /*
1053 * Card detection callback from host.
1054 */
1055 static void mmc_sd_detect(struct mmc_host *host)
1056 {
1057 int err;
1058
1059 BUG_ON(!host);
1060 BUG_ON(!host->card);
1061
1062 mmc_get_card(host->card);
1063
1064 /*
1065 * Just check if our card has been removed.
1066 */
1067 err = _mmc_detect_card_removed(host);
1068
1069 mmc_put_card(host->card);
1070
1071 if (err) {
1072 mmc_sd_remove(host);
1073
1074 mmc_claim_host(host);
1075 mmc_detach_bus(host);
1076 mmc_power_off(host);
1077 mmc_release_host(host);
1078 }
1079 }
1080
1081 static int _mmc_sd_suspend(struct mmc_host *host)
1082 {
1083 int err = 0;
1084
1085 BUG_ON(!host);
1086 BUG_ON(!host->card);
1087
1088 mmc_claim_host(host);
1089
1090 if (mmc_card_suspended(host->card))
1091 goto out;
1092
1093 if (!mmc_host_is_spi(host))
1094 err = mmc_deselect_cards(host);
1095
1096 if (!err) {
1097 mmc_power_off(host);
1098 mmc_card_set_suspended(host->card);
1099 }
1100
1101 out:
1102 mmc_release_host(host);
1103 return err;
1104 }
1105
1106 /*
1107 * Callback for suspend
1108 */
1109 static int mmc_sd_suspend(struct mmc_host *host)
1110 {
1111 int err;
1112
1113 err = _mmc_sd_suspend(host);
1114 if (!err) {
1115 pm_runtime_disable(&host->card->dev);
1116 pm_runtime_set_suspended(&host->card->dev);
1117 }
1118
1119 return err;
1120 }
1121
1122 /*
1123 * This function tries to determine if the same card is still present
1124 * and, if so, restore all state to it.
1125 */
1126 static int _mmc_sd_resume(struct mmc_host *host)
1127 {
1128 int err = 0;
1129
1130 BUG_ON(!host);
1131 BUG_ON(!host->card);
1132
1133 mmc_claim_host(host);
1134
1135 if (!mmc_card_suspended(host->card))
1136 goto out;
1137
1138 mmc_power_up(host, host->card->ocr);
1139 err = mmc_sd_init_card(host, host->card->ocr, host->card);
1140 mmc_card_clr_suspended(host->card);
1141
1142 out:
1143 mmc_release_host(host);
1144 return err;
1145 }
1146
1147 /*
1148 * Callback for resume
1149 */
1150 static int mmc_sd_resume(struct mmc_host *host)
1151 {
1152 int err = 0;
1153
1154 if (!(host->caps & MMC_CAP_RUNTIME_RESUME)) {
1155 err = _mmc_sd_resume(host);
1156 pm_runtime_set_active(&host->card->dev);
1157 pm_runtime_mark_last_busy(&host->card->dev);
1158 }
1159 pm_runtime_enable(&host->card->dev);
1160
1161 return err;
1162 }
1163
1164 /*
1165 * Callback for runtime_suspend.
1166 */
1167 static int mmc_sd_runtime_suspend(struct mmc_host *host)
1168 {
1169 int err;
1170
1171 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
1172 return 0;
1173
1174 err = _mmc_sd_suspend(host);
1175 if (err)
1176 pr_err("%s: error %d doing aggressive suspend\n",
1177 mmc_hostname(host), err);
1178
1179 return err;
1180 }
1181
1182 /*
1183 * Callback for runtime_resume.
1184 */
1185 static int mmc_sd_runtime_resume(struct mmc_host *host)
1186 {
1187 int err;
1188
1189 if (!(host->caps & (MMC_CAP_AGGRESSIVE_PM | MMC_CAP_RUNTIME_RESUME)))
1190 return 0;
1191
1192 err = _mmc_sd_resume(host);
1193 if (err)
1194 pr_err("%s: error %d doing aggressive resume\n",
1195 mmc_hostname(host), err);
1196
1197 return 0;
1198 }
1199
1200 static int mmc_sd_power_restore(struct mmc_host *host)
1201 {
1202 int ret;
1203
1204 mmc_claim_host(host);
1205 ret = mmc_sd_init_card(host, host->card->ocr, host->card);
1206 mmc_release_host(host);
1207
1208 return ret;
1209 }
1210
1211 static int mmc_sd_reset(struct mmc_host *host)
1212 {
1213 mmc_power_cycle(host, host->card->ocr);
1214 return mmc_sd_power_restore(host);
1215 }
1216
1217 static const struct mmc_bus_ops mmc_sd_ops = {
1218 .remove = mmc_sd_remove,
1219 .detect = mmc_sd_detect,
1220 .runtime_suspend = mmc_sd_runtime_suspend,
1221 .runtime_resume = mmc_sd_runtime_resume,
1222 .suspend = mmc_sd_suspend,
1223 .resume = mmc_sd_resume,
1224 .power_restore = mmc_sd_power_restore,
1225 .alive = mmc_sd_alive,
1226 .shutdown = mmc_sd_suspend,
1227 .reset = mmc_sd_reset,
1228 };
1229
1230 /*
1231 * Starting point for SD card init.
1232 */
1233 int mmc_attach_sd(struct mmc_host *host)
1234 {
1235 int err;
1236 u32 ocr, rocr;
1237
1238 BUG_ON(!host);
1239 WARN_ON(!host->claimed);
1240
1241 err = mmc_send_app_op_cond(host, 0, &ocr);
1242 if (err)
1243 return err;
1244
1245 mmc_attach_bus(host, &mmc_sd_ops);
1246 if (host->ocr_avail_sd)
1247 host->ocr_avail = host->ocr_avail_sd;
1248
1249 /*
1250 * We need to get OCR a different way for SPI.
1251 */
1252 if (mmc_host_is_spi(host)) {
1253 mmc_go_idle(host);
1254
1255 err = mmc_spi_read_ocr(host, 0, &ocr);
1256 if (err)
1257 goto err;
1258 }
1259
1260 rocr = mmc_select_voltage(host, ocr);
1261
1262 /*
1263 * Can we support the voltage(s) of the card(s)?
1264 */
1265 if (!rocr) {
1266 err = -EINVAL;
1267 goto err;
1268 }
1269
1270 /*
1271 * Detect and init the card.
1272 */
1273 err = mmc_sd_init_card(host, rocr, NULL);
1274 if (err)
1275 goto err;
1276
1277 mmc_release_host(host);
1278 err = mmc_add_card(host->card);
1279 mmc_claim_host(host);
1280 if (err)
1281 goto remove_card;
1282
1283 return 0;
1284
1285 remove_card:
1286 mmc_release_host(host);
1287 mmc_remove_card(host->card);
1288 host->card = NULL;
1289 mmc_claim_host(host);
1290 err:
1291 mmc_detach_bus(host);
1292
1293 pr_err("%s: error %d whilst initialising SD card\n",
1294 mmc_hostname(host), err);
1295
1296 return err;
1297 }
Linux kernel - Deliverables
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