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x86/xen: resume timer irqs early
[linux/fpc-iii.git] / drivers / mmc / core / sd.c
blob06da0608283a16592c1e6a2e2cbc28ae3cd790f0
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
18 #include <linux/mmc/host.h>
19 #include <linux/mmc/card.h>
20 #include <linux/mmc/mmc.h>
21 #include <linux/mmc/sd.h>
22
23 #include "core.h"
24 #include "bus.h"
25 #include "mmc_ops.h"
26 #include "sd.h"
27 #include "sd_ops.h"
28
29 static const unsigned int tran_exp[] = {
30 10000, 100000, 1000000, 10000000,
31 0, 0, 0, 0
32 };
33
34 static const unsigned char tran_mant[] = {
35 0, 10, 12, 13, 15, 20, 25, 30,
36 35, 40, 45, 50, 55, 60, 70, 80,
37 };
38
39 static const unsigned int tacc_exp[] = {
40 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
41 };
42
43 static const unsigned int tacc_mant[] = {
44 0, 10, 12, 13, 15, 20, 25, 30,
45 35, 40, 45, 50, 55, 60, 70, 80,
46 };
47
48 static const unsigned int sd_au_size[] = {
49 0, SZ_16K / 512, SZ_32K / 512, SZ_64K / 512,
50 SZ_128K / 512, SZ_256K / 512, SZ_512K / 512, SZ_1M / 512,
51 SZ_2M / 512, SZ_4M / 512, SZ_8M / 512, (SZ_8M + SZ_4M) / 512,
52 SZ_16M / 512, (SZ_16M + SZ_8M) / 512, SZ_32M / 512, SZ_64M / 512,
53 };
54
55 #define UNSTUFF_BITS(resp,start,size) \
56 ({ \
57 const int __size = size; \
58 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
59 const int __off = 3 - ((start) / 32); \
60 const int __shft = (start) & 31; \
61 u32 __res; \
62 \
63 __res = resp[__off] >> __shft; \
64 if (__size + __shft > 32) \
65 __res |= resp[__off-1] << ((32 - __shft) % 32); \
66 __res & __mask; \
67 })
68
69 /*
70 * Given the decoded CSD structure, decode the raw CID to our CID structure.
71 */
72 void mmc_decode_cid(struct mmc_card *card)
73 {
74 u32 *resp = card->raw_cid;
75
76 memset(&card->cid, 0, sizeof(struct mmc_cid));
77
78 /*
79 * SD doesn't currently have a version field so we will
80 * have to assume we can parse this.
81 */
82 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
83 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
84 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
85 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
86 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
87 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
88 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
89 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4);
90 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4);
91 card->cid.serial = UNSTUFF_BITS(resp, 24, 32);
92 card->cid.year = UNSTUFF_BITS(resp, 12, 8);
93 card->cid.month = UNSTUFF_BITS(resp, 8, 4);
94
95 card->cid.year += 2000; /* SD cards year offset */
96 }
97
98 /*
99 * Given a 128-bit response, decode to our card CSD structure.
100 */
101 static int mmc_decode_csd(struct mmc_card *card)
102 {
103 struct mmc_csd *csd = &card->csd;
104 unsigned int e, m, csd_struct;
105 u32 *resp = card->raw_csd;
106
107 csd_struct = UNSTUFF_BITS(resp, 126, 2);
108
109 switch (csd_struct) {
110 case 0:
111 m = UNSTUFF_BITS(resp, 115, 4);
112 e = UNSTUFF_BITS(resp, 112, 3);
113 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
114 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
115
116 m = UNSTUFF_BITS(resp, 99, 4);
117 e = UNSTUFF_BITS(resp, 96, 3);
118 csd->max_dtr = tran_exp[e] * tran_mant[m];
119 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
120
121 e = UNSTUFF_BITS(resp, 47, 3);
122 m = UNSTUFF_BITS(resp, 62, 12);
123 csd->capacity = (1 + m) << (e + 2);
124
125 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
126 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
127 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
128 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
129 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
130 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
131 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
132
133 if (UNSTUFF_BITS(resp, 46, 1)) {
134 csd->erase_size = 1;
135 } else if (csd->write_blkbits >= 9) {
136 csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1;
137 csd->erase_size <<= csd->write_blkbits - 9;
138 }
139 break;
140 case 1:
141 /*
142 * This is a block-addressed SDHC or SDXC card. Most
143 * interesting fields are unused and have fixed
144 * values. To avoid getting tripped by buggy cards,
145 * we assume those fixed values ourselves.
146 */
147 mmc_card_set_blockaddr(card);
148
149 csd->tacc_ns = 0; /* Unused */
150 csd->tacc_clks = 0; /* Unused */
151
152 m = UNSTUFF_BITS(resp, 99, 4);
153 e = UNSTUFF_BITS(resp, 96, 3);
154 csd->max_dtr = tran_exp[e] * tran_mant[m];
155 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
156 csd->c_size = UNSTUFF_BITS(resp, 48, 22);
157
158 /* SDXC cards have a minimum C_SIZE of 0x00FFFF */
159 if (csd->c_size >= 0xFFFF)
160 mmc_card_set_ext_capacity(card);
161
162 m = UNSTUFF_BITS(resp, 48, 22);
163 csd->capacity = (1 + m) << 10;
164
165 csd->read_blkbits = 9;
166 csd->read_partial = 0;
167 csd->write_misalign = 0;
168 csd->read_misalign = 0;
169 csd->r2w_factor = 4; /* Unused */
170 csd->write_blkbits = 9;
171 csd->write_partial = 0;
172 csd->erase_size = 1;
173 break;
174 default:
175 pr_err("%s: unrecognised CSD structure version %d\n",
176 mmc_hostname(card->host), csd_struct);
177 return -EINVAL;
178 }
179
180 card->erase_size = csd->erase_size;
181
182 return 0;
183 }
184
185 /*
186 * Given a 64-bit response, decode to our card SCR structure.
187 */
188 static int mmc_decode_scr(struct mmc_card *card)
189 {
190 struct sd_scr *scr = &card->scr;
191 unsigned int scr_struct;
192 u32 resp[4];
193
194 resp[3] = card->raw_scr[1];
195 resp[2] = card->raw_scr[0];
196
197 scr_struct = UNSTUFF_BITS(resp, 60, 4);
198 if (scr_struct != 0) {
199 pr_err("%s: unrecognised SCR structure version %d\n",
200 mmc_hostname(card->host), scr_struct);
201 return -EINVAL;
202 }
203
204 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
205 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
206 if (scr->sda_vsn == SCR_SPEC_VER_2)
207 /* Check if Physical Layer Spec v3.0 is supported */
208 scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1);
209
210 if (UNSTUFF_BITS(resp, 55, 1))
211 card->erased_byte = 0xFF;
212 else
213 card->erased_byte = 0x0;
214
215 if (scr->sda_spec3)
216 scr->cmds = UNSTUFF_BITS(resp, 32, 2);
217 return 0;
218 }
219
220 /*
221 * Fetch and process SD Status register.
222 */
223 static int mmc_read_ssr(struct mmc_card *card)
224 {
225 unsigned int au, es, et, eo;
226 int err, i;
227 u32 *ssr;
228
229 if (!(card->csd.cmdclass & CCC_APP_SPEC)) {
230 pr_warning("%s: card lacks mandatory SD Status "
231 "function.\n", mmc_hostname(card->host));
232 return 0;
233 }
234
235 ssr = kmalloc(64, GFP_KERNEL);
236 if (!ssr)
237 return -ENOMEM;
238
239 err = mmc_app_sd_status(card, ssr);
240 if (err) {
241 pr_warning("%s: problem reading SD Status "
242 "register.\n", mmc_hostname(card->host));
243 err = 0;
244 goto out;
245 }
246
247 for (i = 0; i < 16; i++)
248 ssr[i] = be32_to_cpu(ssr[i]);
249
250 /*
251 * UNSTUFF_BITS only works with four u32s so we have to offset the
252 * bitfield positions accordingly.
253 */
254 au = UNSTUFF_BITS(ssr, 428 - 384, 4);
255 if (au) {
256 if (au <= 9 || card->scr.sda_spec3) {
257 card->ssr.au = sd_au_size[au];
258 es = UNSTUFF_BITS(ssr, 408 - 384, 16);
259 et = UNSTUFF_BITS(ssr, 402 - 384, 6);
260 if (es && et) {
261 eo = UNSTUFF_BITS(ssr, 400 - 384, 2);
262 card->ssr.erase_timeout = (et * 1000) / es;
263 card->ssr.erase_offset = eo * 1000;
264 }
265 } else {
266 pr_warning("%s: SD Status: Invalid Allocation Unit size.\n",
267 mmc_hostname(card->host));
268 }
269 }
270 out:
271 kfree(ssr);
272 return err;
273 }
274
275 /*
276 * Fetches and decodes switch information
277 */
278 static int mmc_read_switch(struct mmc_card *card)
279 {
280 int err;
281 u8 *status;
282
283 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
284 return 0;
285
286 if (!(card->csd.cmdclass & CCC_SWITCH)) {
287 pr_warning("%s: card lacks mandatory switch "
288 "function, performance might suffer.\n",
289 mmc_hostname(card->host));
290 return 0;
291 }
292
293 err = -EIO;
294
295 status = kmalloc(64, GFP_KERNEL);
296 if (!status) {
297 pr_err("%s: could not allocate a buffer for "
298 "switch capabilities.\n",
299 mmc_hostname(card->host));
300 return -ENOMEM;
301 }
302
303 /*
304 * Find out the card's support bits with a mode 0 operation.
305 * The argument does not matter, as the support bits do not
306 * change with the arguments.
307 */
308 err = mmc_sd_switch(card, 0, 0, 0, status);
309 if (err) {
310 /*
311 * If the host or the card can't do the switch,
312 * fail more gracefully.
313 */
314 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
315 goto out;
316
317 pr_warning("%s: problem reading Bus Speed modes.\n",
318 mmc_hostname(card->host));
319 err = 0;
320
321 goto out;
322 }
323
324 if (status[13] & SD_MODE_HIGH_SPEED)
325 card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR;
326
327 if (card->scr.sda_spec3) {
328 card->sw_caps.sd3_bus_mode = status[13];
329 /* Driver Strengths supported by the card */
330 card->sw_caps.sd3_drv_type = status[9];
331 }
332
333 out:
334 kfree(status);
335
336 return err;
337 }
338
339 /*
340 * Test if the card supports high-speed mode and, if so, switch to it.
341 */
342 int mmc_sd_switch_hs(struct mmc_card *card)
343 {
344 int err;
345 u8 *status;
346
347 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
348 return 0;
349
350 if (!(card->csd.cmdclass & CCC_SWITCH))
351 return 0;
352
353 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
354 return 0;
355
356 if (card->sw_caps.hs_max_dtr == 0)
357 return 0;
358
359 err = -EIO;
360
361 status = kmalloc(64, GFP_KERNEL);
362 if (!status) {
363 pr_err("%s: could not allocate a buffer for "
364 "switch capabilities.\n", mmc_hostname(card->host));
365 return -ENOMEM;
366 }
367
368 err = mmc_sd_switch(card, 1, 0, 1, status);
369 if (err)
370 goto out;
371
372 if ((status[16] & 0xF) != 1) {
373 pr_warning("%s: Problem switching card "
374 "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_warning("%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_warning("%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_warning("%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) && card->host->ops->execute_tuning &&
664 (card->sd_bus_speed == UHS_SDR50_BUS_SPEED ||
665 card->sd_bus_speed == UHS_SDR104_BUS_SPEED)) {
666 mmc_host_clk_hold(card->host);
667 err = card->host->ops->execute_tuning(card->host,
668 MMC_SEND_TUNING_BLOCK);
669 mmc_host_clk_release(card->host);
670 }
671
672 out:
673 kfree(status);
674
675 return err;
676 }
677
678 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
679 card->raw_cid[2], card->raw_cid[3]);
680 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
681 card->raw_csd[2], card->raw_csd[3]);
682 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
683 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
684 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
685 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
686 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
687 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
688 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
689 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
690 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
691 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
692
693
694 static struct attribute *sd_std_attrs[] = {
695 &dev_attr_cid.attr,
696 &dev_attr_csd.attr,
697 &dev_attr_scr.attr,
698 &dev_attr_date.attr,
699 &dev_attr_erase_size.attr,
700 &dev_attr_preferred_erase_size.attr,
701 &dev_attr_fwrev.attr,
702 &dev_attr_hwrev.attr,
703 &dev_attr_manfid.attr,
704 &dev_attr_name.attr,
705 &dev_attr_oemid.attr,
706 &dev_attr_serial.attr,
707 NULL,
708 };
709
710 static struct attribute_group sd_std_attr_group = {
711 .attrs = sd_std_attrs,
712 };
713
714 static const struct attribute_group *sd_attr_groups[] = {
715 &sd_std_attr_group,
716 NULL,
717 };
718
719 struct device_type sd_type = {
720 .groups = sd_attr_groups,
721 };
722
723 /*
724 * Fetch CID from card.
725 */
726 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
727 {
728 int err;
729 u32 max_current;
730 int retries = 10;
731
732 try_again:
733 if (!retries) {
734 ocr &= ~SD_OCR_S18R;
735 pr_warning("%s: Skipping voltage switch\n",
736 mmc_hostname(host));
737 }
738
739 /*
740 * Since we're changing the OCR value, we seem to
741 * need to tell some cards to go back to the idle
742 * state. We wait 1ms to give cards time to
743 * respond.
744 */
745 mmc_go_idle(host);
746
747 /*
748 * If SD_SEND_IF_COND indicates an SD 2.0
749 * compliant card and we should set bit 30
750 * of the ocr to indicate that we can handle
751 * block-addressed SDHC cards.
752 */
753 err = mmc_send_if_cond(host, ocr);
754 if (!err)
755 ocr |= SD_OCR_CCS;
756
757 /*
758 * If the host supports one of UHS-I modes, request the card
759 * to switch to 1.8V signaling level. If the card has failed
760 * repeatedly to switch however, skip this.
761 */
762 if (retries && mmc_host_uhs(host))
763 ocr |= SD_OCR_S18R;
764
765 /*
766 * If the host can supply more than 150mA at current voltage,
767 * XPC should be set to 1.
768 */
769 max_current = sd_get_host_max_current(host);
770 if (max_current > 150)
771 ocr |= SD_OCR_XPC;
772
773 err = mmc_send_app_op_cond(host, ocr, rocr);
774 if (err)
775 return err;
776
777 /*
778 * In case CCS and S18A in the response is set, start Signal Voltage
779 * Switch procedure. SPI mode doesn't support CMD11.
780 */
781 if (!mmc_host_is_spi(host) && rocr &&
782 ((*rocr & 0x41000000) == 0x41000000)) {
783 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
784 if (err == -EAGAIN) {
785 retries--;
786 goto try_again;
787 } else if (err) {
788 retries = 0;
789 goto try_again;
790 }
791 }
792
793 if (mmc_host_is_spi(host))
794 err = mmc_send_cid(host, cid);
795 else
796 err = mmc_all_send_cid(host, cid);
797
798 return err;
799 }
800
801 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card)
802 {
803 int err;
804
805 /*
806 * Fetch CSD from card.
807 */
808 err = mmc_send_csd(card, card->raw_csd);
809 if (err)
810 return err;
811
812 err = mmc_decode_csd(card);
813 if (err)
814 return err;
815
816 return 0;
817 }
818
819 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
820 bool reinit)
821 {
822 int err;
823
824 if (!reinit) {
825 /*
826 * Fetch SCR from card.
827 */
828 err = mmc_app_send_scr(card, card->raw_scr);
829 if (err)
830 return err;
831
832 err = mmc_decode_scr(card);
833 if (err)
834 return err;
835
836 /*
837 * Fetch and process SD Status register.
838 */
839 err = mmc_read_ssr(card);
840 if (err)
841 return err;
842
843 /* Erase init depends on CSD and SSR */
844 mmc_init_erase(card);
845
846 /*
847 * Fetch switch information from card.
848 */
849 err = mmc_read_switch(card);
850 if (err)
851 return err;
852 }
853
854 /*
855 * For SPI, enable CRC as appropriate.
856 * This CRC enable is located AFTER the reading of the
857 * card registers because some SDHC cards are not able
858 * to provide valid CRCs for non-512-byte blocks.
859 */
860 if (mmc_host_is_spi(host)) {
861 err = mmc_spi_set_crc(host, use_spi_crc);
862 if (err)
863 return err;
864 }
865
866 /*
867 * Check if read-only switch is active.
868 */
869 if (!reinit) {
870 int ro = -1;
871
872 if (host->ops->get_ro) {
873 mmc_host_clk_hold(card->host);
874 ro = host->ops->get_ro(host);
875 mmc_host_clk_release(card->host);
876 }
877
878 if (ro < 0) {
879 pr_warning("%s: host does not "
880 "support reading read-only "
881 "switch. assuming write-enable.\n",
882 mmc_hostname(host));
883 } else if (ro > 0) {
884 mmc_card_set_readonly(card);
885 }
886 }
887
888 return 0;
889 }
890
891 unsigned mmc_sd_get_max_clock(struct mmc_card *card)
892 {
893 unsigned max_dtr = (unsigned int)-1;
894
895 if (mmc_card_highspeed(card)) {
896 if (max_dtr > card->sw_caps.hs_max_dtr)
897 max_dtr = card->sw_caps.hs_max_dtr;
898 } else if (max_dtr > card->csd.max_dtr) {
899 max_dtr = card->csd.max_dtr;
900 }
901
902 return max_dtr;
903 }
904
905 void mmc_sd_go_highspeed(struct mmc_card *card)
906 {
907 mmc_card_set_highspeed(card);
908 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
909 }
910
911 /*
912 * Handle the detection and initialisation of a card.
913 *
914 * In the case of a resume, "oldcard" will contain the card
915 * we're trying to reinitialise.
916 */
917 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
918 struct mmc_card *oldcard)
919 {
920 struct mmc_card *card;
921 int err;
922 u32 cid[4];
923 u32 rocr = 0;
924
925 BUG_ON(!host);
926 WARN_ON(!host->claimed);
927
928 err = mmc_sd_get_cid(host, ocr, cid, &rocr);
929 if (err)
930 return err;
931
932 if (oldcard) {
933 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
934 return -ENOENT;
935
936 card = oldcard;
937 } else {
938 /*
939 * Allocate card structure.
940 */
941 card = mmc_alloc_card(host, &sd_type);
942 if (IS_ERR(card))
943 return PTR_ERR(card);
944
945 card->type = MMC_TYPE_SD;
946 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
947 }
948
949 /*
950 * For native busses: get card RCA and quit open drain mode.
951 */
952 if (!mmc_host_is_spi(host)) {
953 err = mmc_send_relative_addr(host, &card->rca);
954 if (err)
955 goto free_card;
956 }
957
958 if (!oldcard) {
959 err = mmc_sd_get_csd(host, card);
960 if (err)
961 goto free_card;
962
963 mmc_decode_cid(card);
964 }
965
966 /*
967 * Select card, as all following commands rely on that.
968 */
969 if (!mmc_host_is_spi(host)) {
970 err = mmc_select_card(card);
971 if (err)
972 goto free_card;
973 }
974
975 err = mmc_sd_setup_card(host, card, oldcard != NULL);
976 if (err)
977 goto free_card;
978
979 /* Initialization sequence for UHS-I cards */
980 if (rocr & SD_ROCR_S18A) {
981 err = mmc_sd_init_uhs_card(card);
982 if (err)
983 goto free_card;
984
985 /* Card is an ultra-high-speed card */
986 mmc_card_set_uhs(card);
987 } else {
988 /*
989 * Attempt to change to high-speed (if supported)
990 */
991 err = mmc_sd_switch_hs(card);
992 if (err > 0)
993 mmc_sd_go_highspeed(card);
994 else if (err)
995 goto free_card;
996
997 /*
998 * Set bus speed.
999 */
1000 mmc_set_clock(host, mmc_sd_get_max_clock(card));
1001
1002 /*
1003 * Switch to wider bus (if supported).
1004 */
1005 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
1006 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
1007 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
1008 if (err)
1009 goto free_card;
1010
1011 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
1012 }
1013 }
1014
1015 host->card = card;
1016 return 0;
1017
1018 free_card:
1019 if (!oldcard)
1020 mmc_remove_card(card);
1021
1022 return err;
1023 }
1024
1025 /*
1026 * Host is being removed. Free up the current card.
1027 */
1028 static void mmc_sd_remove(struct mmc_host *host)
1029 {
1030 BUG_ON(!host);
1031 BUG_ON(!host->card);
1032
1033 mmc_remove_card(host->card);
1034 host->card = NULL;
1035 }
1036
1037 /*
1038 * Card detection - card is alive.
1039 */
1040 static int mmc_sd_alive(struct mmc_host *host)
1041 {
1042 return mmc_send_status(host->card, NULL);
1043 }
1044
1045 /*
1046 * Card detection callback from host.
1047 */
1048 static void mmc_sd_detect(struct mmc_host *host)
1049 {
1050 int err;
1051
1052 BUG_ON(!host);
1053 BUG_ON(!host->card);
1054
1055 mmc_get_card(host->card);
1056
1057 /*
1058 * Just check if our card has been removed.
1059 */
1060 err = _mmc_detect_card_removed(host);
1061
1062 mmc_put_card(host->card);
1063
1064 if (err) {
1065 mmc_sd_remove(host);
1066
1067 mmc_claim_host(host);
1068 mmc_detach_bus(host);
1069 mmc_power_off(host);
1070 mmc_release_host(host);
1071 }
1072 }
1073
1074 /*
1075 * Suspend callback from host.
1076 */
1077 static int mmc_sd_suspend(struct mmc_host *host)
1078 {
1079 int err = 0;
1080
1081 BUG_ON(!host);
1082 BUG_ON(!host->card);
1083
1084 mmc_claim_host(host);
1085 if (!mmc_host_is_spi(host))
1086 err = mmc_deselect_cards(host);
1087 host->card->state &= ~MMC_STATE_HIGHSPEED;
1088 if (!err)
1089 mmc_power_off(host);
1090 mmc_release_host(host);
1091
1092 return err;
1093 }
1094
1095 /*
1096 * Resume callback from host.
1097 *
1098 * This function tries to determine if the same card is still present
1099 * and, if so, restore all state to it.
1100 */
1101 static int mmc_sd_resume(struct mmc_host *host)
1102 {
1103 int err;
1104
1105 BUG_ON(!host);
1106 BUG_ON(!host->card);
1107
1108 mmc_claim_host(host);
1109 mmc_power_up(host);
1110 mmc_select_voltage(host, host->ocr);
1111 err = mmc_sd_init_card(host, host->ocr, host->card);
1112 mmc_release_host(host);
1113
1114 return err;
1115 }
1116
1117 /*
1118 * Callback for runtime_suspend.
1119 */
1120 static int mmc_sd_runtime_suspend(struct mmc_host *host)
1121 {
1122 int err;
1123
1124 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
1125 return 0;
1126
1127 mmc_claim_host(host);
1128
1129 err = mmc_sd_suspend(host);
1130 if (err) {
1131 pr_err("%s: error %d doing aggessive suspend\n",
1132 mmc_hostname(host), err);
1133 goto out;
1134 }
1135 mmc_power_off(host);
1136
1137 out:
1138 mmc_release_host(host);
1139 return err;
1140 }
1141
1142 /*
1143 * Callback for runtime_resume.
1144 */
1145 static int mmc_sd_runtime_resume(struct mmc_host *host)
1146 {
1147 int err;
1148
1149 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
1150 return 0;
1151
1152 mmc_claim_host(host);
1153
1154 mmc_power_up(host);
1155 err = mmc_sd_resume(host);
1156 if (err)
1157 pr_err("%s: error %d doing aggessive resume\n",
1158 mmc_hostname(host), err);
1159
1160 mmc_release_host(host);
1161 return 0;
1162 }
1163
1164 static int mmc_sd_power_restore(struct mmc_host *host)
1165 {
1166 int ret;
1167
1168 host->card->state &= ~MMC_STATE_HIGHSPEED;
1169 mmc_claim_host(host);
1170 ret = mmc_sd_init_card(host, host->ocr, host->card);
1171 mmc_release_host(host);
1172
1173 return ret;
1174 }
1175
1176 static const struct mmc_bus_ops mmc_sd_ops = {
1177 .remove = mmc_sd_remove,
1178 .detect = mmc_sd_detect,
1179 .suspend = NULL,
1180 .resume = NULL,
1181 .power_restore = mmc_sd_power_restore,
1182 .alive = mmc_sd_alive,
1183 .shutdown = mmc_sd_suspend,
1184 };
1185
1186 static const struct mmc_bus_ops mmc_sd_ops_unsafe = {
1187 .remove = mmc_sd_remove,
1188 .detect = mmc_sd_detect,
1189 .runtime_suspend = mmc_sd_runtime_suspend,
1190 .runtime_resume = mmc_sd_runtime_resume,
1191 .suspend = mmc_sd_suspend,
1192 .resume = mmc_sd_resume,
1193 .power_restore = mmc_sd_power_restore,
1194 .alive = mmc_sd_alive,
1195 .shutdown = mmc_sd_suspend,
1196 };
1197
1198 static void mmc_sd_attach_bus_ops(struct mmc_host *host)
1199 {
1200 const struct mmc_bus_ops *bus_ops;
1201
1202 if (!mmc_card_is_removable(host))
1203 bus_ops = &mmc_sd_ops_unsafe;
1204 else
1205 bus_ops = &mmc_sd_ops;
1206 mmc_attach_bus(host, bus_ops);
1207 }
1208
1209 /*
1210 * Starting point for SD card init.
1211 */
1212 int mmc_attach_sd(struct mmc_host *host)
1213 {
1214 int err;
1215 u32 ocr;
1216
1217 BUG_ON(!host);
1218 WARN_ON(!host->claimed);
1219
1220 err = mmc_send_app_op_cond(host, 0, &ocr);
1221 if (err)
1222 return err;
1223
1224 mmc_sd_attach_bus_ops(host);
1225 if (host->ocr_avail_sd)
1226 host->ocr_avail = host->ocr_avail_sd;
1227
1228 /*
1229 * We need to get OCR a different way for SPI.
1230 */
1231 if (mmc_host_is_spi(host)) {
1232 mmc_go_idle(host);
1233
1234 err = mmc_spi_read_ocr(host, 0, &ocr);
1235 if (err)
1236 goto err;
1237 }
1238
1239 /*
1240 * Sanity check the voltages that the card claims to
1241 * support.
1242 */
1243 if (ocr & 0x7F) {
1244 pr_warning("%s: card claims to support voltages "
1245 "below the defined range. These will be ignored.\n",
1246 mmc_hostname(host));
1247 ocr &= ~0x7F;
1248 }
1249
1250 if ((ocr & MMC_VDD_165_195) &&
1251 !(host->ocr_avail_sd & MMC_VDD_165_195)) {
1252 pr_warning("%s: SD card claims to support the "
1253 "incompletely defined 'low voltage range'. This "
1254 "will be ignored.\n", mmc_hostname(host));
1255 ocr &= ~MMC_VDD_165_195;
1256 }
1257
1258 host->ocr = mmc_select_voltage(host, ocr);
1259
1260 /*
1261 * Can we support the voltage(s) of the card(s)?
1262 */
1263 if (!host->ocr) {
1264 err = -EINVAL;
1265 goto err;
1266 }
1267
1268 /*
1269 * Detect and init the card.
1270 */
1271 err = mmc_sd_init_card(host, host->ocr, NULL);
1272 if (err)
1273 goto err;
1274
1275 mmc_release_host(host);
1276 err = mmc_add_card(host->card);
1277 mmc_claim_host(host);
1278 if (err)
1279 goto remove_card;
1280
1281 return 0;
1282
1283 remove_card:
1284 mmc_release_host(host);
1285 mmc_remove_card(host->card);
1286 host->card = NULL;
1287 mmc_claim_host(host);
1288 err:
1289 mmc_detach_bus(host);
1290
1291 pr_err("%s: error %d whilst initialising SD card\n",
1292 mmc_hostname(host), err);
1293
1294 return err;
1295 }
1296
Linux with added FPC-III support