Loading...
1/*
2 * linux/drivers/mmc/core/mmc_ops.h
3 *
4 * Copyright 2006-2007 Pierre Ossman
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or (at
9 * your option) any later version.
10 */
11
12#include <linux/slab.h>
13#include <linux/export.h>
14#include <linux/types.h>
15#include <linux/scatterlist.h>
16
17#include <linux/mmc/host.h>
18#include <linux/mmc/card.h>
19#include <linux/mmc/mmc.h>
20
21#include "core.h"
22#include "mmc_ops.h"
23
24static int _mmc_select_card(struct mmc_host *host, struct mmc_card *card)
25{
26 int err;
27 struct mmc_command cmd = {0};
28
29 BUG_ON(!host);
30
31 cmd.opcode = MMC_SELECT_CARD;
32
33 if (card) {
34 cmd.arg = card->rca << 16;
35 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
36 } else {
37 cmd.arg = 0;
38 cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
39 }
40
41 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
42 if (err)
43 return err;
44
45 return 0;
46}
47
48int mmc_select_card(struct mmc_card *card)
49{
50 BUG_ON(!card);
51
52 return _mmc_select_card(card->host, card);
53}
54
55int mmc_deselect_cards(struct mmc_host *host)
56{
57 return _mmc_select_card(host, NULL);
58}
59
60int mmc_card_sleepawake(struct mmc_host *host, int sleep)
61{
62 struct mmc_command cmd = {0};
63 struct mmc_card *card = host->card;
64 int err;
65
66 if (sleep)
67 mmc_deselect_cards(host);
68
69 cmd.opcode = MMC_SLEEP_AWAKE;
70 cmd.arg = card->rca << 16;
71 if (sleep)
72 cmd.arg |= 1 << 15;
73
74 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
75 err = mmc_wait_for_cmd(host, &cmd, 0);
76 if (err)
77 return err;
78
79 /*
80 * If the host does not wait while the card signals busy, then we will
81 * will have to wait the sleep/awake timeout. Note, we cannot use the
82 * SEND_STATUS command to poll the status because that command (and most
83 * others) is invalid while the card sleeps.
84 */
85 if (!(host->caps & MMC_CAP_WAIT_WHILE_BUSY))
86 mmc_delay(DIV_ROUND_UP(card->ext_csd.sa_timeout, 10000));
87
88 if (!sleep)
89 err = mmc_select_card(card);
90
91 return err;
92}
93
94int mmc_go_idle(struct mmc_host *host)
95{
96 int err;
97 struct mmc_command cmd = {0};
98
99 /*
100 * Non-SPI hosts need to prevent chipselect going active during
101 * GO_IDLE; that would put chips into SPI mode. Remind them of
102 * that in case of hardware that won't pull up DAT3/nCS otherwise.
103 *
104 * SPI hosts ignore ios.chip_select; it's managed according to
105 * rules that must accommodate non-MMC slaves which this layer
106 * won't even know about.
107 */
108 if (!mmc_host_is_spi(host)) {
109 mmc_set_chip_select(host, MMC_CS_HIGH);
110 mmc_delay(1);
111 }
112
113 cmd.opcode = MMC_GO_IDLE_STATE;
114 cmd.arg = 0;
115 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_NONE | MMC_CMD_BC;
116
117 err = mmc_wait_for_cmd(host, &cmd, 0);
118
119 mmc_delay(1);
120
121 if (!mmc_host_is_spi(host)) {
122 mmc_set_chip_select(host, MMC_CS_DONTCARE);
123 mmc_delay(1);
124 }
125
126 host->use_spi_crc = 0;
127
128 return err;
129}
130
131int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
132{
133 struct mmc_command cmd = {0};
134 int i, err = 0;
135
136 BUG_ON(!host);
137
138 cmd.opcode = MMC_SEND_OP_COND;
139 cmd.arg = mmc_host_is_spi(host) ? 0 : ocr;
140 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
141
142 for (i = 100; i; i--) {
143 err = mmc_wait_for_cmd(host, &cmd, 0);
144 if (err)
145 break;
146
147 /* if we're just probing, do a single pass */
148 if (ocr == 0)
149 break;
150
151 /* otherwise wait until reset completes */
152 if (mmc_host_is_spi(host)) {
153 if (!(cmd.resp[0] & R1_SPI_IDLE))
154 break;
155 } else {
156 if (cmd.resp[0] & MMC_CARD_BUSY)
157 break;
158 }
159
160 err = -ETIMEDOUT;
161
162 mmc_delay(10);
163 }
164
165 if (rocr && !mmc_host_is_spi(host))
166 *rocr = cmd.resp[0];
167
168 return err;
169}
170
171int mmc_all_send_cid(struct mmc_host *host, u32 *cid)
172{
173 int err;
174 struct mmc_command cmd = {0};
175
176 BUG_ON(!host);
177 BUG_ON(!cid);
178
179 cmd.opcode = MMC_ALL_SEND_CID;
180 cmd.arg = 0;
181 cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR;
182
183 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
184 if (err)
185 return err;
186
187 memcpy(cid, cmd.resp, sizeof(u32) * 4);
188
189 return 0;
190}
191
192int mmc_set_relative_addr(struct mmc_card *card)
193{
194 int err;
195 struct mmc_command cmd = {0};
196
197 BUG_ON(!card);
198 BUG_ON(!card->host);
199
200 cmd.opcode = MMC_SET_RELATIVE_ADDR;
201 cmd.arg = card->rca << 16;
202 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
203
204 err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
205 if (err)
206 return err;
207
208 return 0;
209}
210
211static int
212mmc_send_cxd_native(struct mmc_host *host, u32 arg, u32 *cxd, int opcode)
213{
214 int err;
215 struct mmc_command cmd = {0};
216
217 BUG_ON(!host);
218 BUG_ON(!cxd);
219
220 cmd.opcode = opcode;
221 cmd.arg = arg;
222 cmd.flags = MMC_RSP_R2 | MMC_CMD_AC;
223
224 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
225 if (err)
226 return err;
227
228 memcpy(cxd, cmd.resp, sizeof(u32) * 4);
229
230 return 0;
231}
232
233static int
234mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host,
235 u32 opcode, void *buf, unsigned len)
236{
237 struct mmc_request mrq = {NULL};
238 struct mmc_command cmd = {0};
239 struct mmc_data data = {0};
240 struct scatterlist sg;
241 void *data_buf;
242
243 /* dma onto stack is unsafe/nonportable, but callers to this
244 * routine normally provide temporary on-stack buffers ...
245 */
246 data_buf = kmalloc(len, GFP_KERNEL);
247 if (data_buf == NULL)
248 return -ENOMEM;
249
250 mrq.cmd = &cmd;
251 mrq.data = &data;
252
253 cmd.opcode = opcode;
254 cmd.arg = 0;
255
256 /* NOTE HACK: the MMC_RSP_SPI_R1 is always correct here, but we
257 * rely on callers to never use this with "native" calls for reading
258 * CSD or CID. Native versions of those commands use the R2 type,
259 * not R1 plus a data block.
260 */
261 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
262
263 data.blksz = len;
264 data.blocks = 1;
265 data.flags = MMC_DATA_READ;
266 data.sg = &sg;
267 data.sg_len = 1;
268
269 sg_init_one(&sg, data_buf, len);
270
271 if (opcode == MMC_SEND_CSD || opcode == MMC_SEND_CID) {
272 /*
273 * The spec states that CSR and CID accesses have a timeout
274 * of 64 clock cycles.
275 */
276 data.timeout_ns = 0;
277 data.timeout_clks = 64;
278 } else
279 mmc_set_data_timeout(&data, card);
280
281 mmc_wait_for_req(host, &mrq);
282
283 memcpy(buf, data_buf, len);
284 kfree(data_buf);
285
286 if (cmd.error)
287 return cmd.error;
288 if (data.error)
289 return data.error;
290
291 return 0;
292}
293
294int mmc_send_csd(struct mmc_card *card, u32 *csd)
295{
296 int ret, i;
297
298 if (!mmc_host_is_spi(card->host))
299 return mmc_send_cxd_native(card->host, card->rca << 16,
300 csd, MMC_SEND_CSD);
301
302 ret = mmc_send_cxd_data(card, card->host, MMC_SEND_CSD, csd, 16);
303 if (ret)
304 return ret;
305
306 for (i = 0;i < 4;i++)
307 csd[i] = be32_to_cpu(csd[i]);
308
309 return 0;
310}
311
312int mmc_send_cid(struct mmc_host *host, u32 *cid)
313{
314 int ret, i;
315
316 if (!mmc_host_is_spi(host)) {
317 if (!host->card)
318 return -EINVAL;
319 return mmc_send_cxd_native(host, host->card->rca << 16,
320 cid, MMC_SEND_CID);
321 }
322
323 ret = mmc_send_cxd_data(NULL, host, MMC_SEND_CID, cid, 16);
324 if (ret)
325 return ret;
326
327 for (i = 0;i < 4;i++)
328 cid[i] = be32_to_cpu(cid[i]);
329
330 return 0;
331}
332
333int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd)
334{
335 return mmc_send_cxd_data(card, card->host, MMC_SEND_EXT_CSD,
336 ext_csd, 512);
337}
338
339int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp)
340{
341 struct mmc_command cmd = {0};
342 int err;
343
344 cmd.opcode = MMC_SPI_READ_OCR;
345 cmd.arg = highcap ? (1 << 30) : 0;
346 cmd.flags = MMC_RSP_SPI_R3;
347
348 err = mmc_wait_for_cmd(host, &cmd, 0);
349
350 *ocrp = cmd.resp[1];
351 return err;
352}
353
354int mmc_spi_set_crc(struct mmc_host *host, int use_crc)
355{
356 struct mmc_command cmd = {0};
357 int err;
358
359 cmd.opcode = MMC_SPI_CRC_ON_OFF;
360 cmd.flags = MMC_RSP_SPI_R1;
361 cmd.arg = use_crc;
362
363 err = mmc_wait_for_cmd(host, &cmd, 0);
364 if (!err)
365 host->use_spi_crc = use_crc;
366 return err;
367}
368
369/**
370 * mmc_switch - modify EXT_CSD register
371 * @card: the MMC card associated with the data transfer
372 * @set: cmd set values
373 * @index: EXT_CSD register index
374 * @value: value to program into EXT_CSD register
375 * @timeout_ms: timeout (ms) for operation performed by register write,
376 * timeout of zero implies maximum possible timeout
377 *
378 * Modifies the EXT_CSD register for selected card.
379 */
380int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
381 unsigned int timeout_ms)
382{
383 int err;
384 struct mmc_command cmd = {0};
385 u32 status;
386
387 BUG_ON(!card);
388 BUG_ON(!card->host);
389
390 cmd.opcode = MMC_SWITCH;
391 cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
392 (index << 16) |
393 (value << 8) |
394 set;
395 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
396 cmd.cmd_timeout_ms = timeout_ms;
397
398 err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
399 if (err)
400 return err;
401
402 /* Must check status to be sure of no errors */
403 do {
404 err = mmc_send_status(card, &status);
405 if (err)
406 return err;
407 if (card->host->caps & MMC_CAP_WAIT_WHILE_BUSY)
408 break;
409 if (mmc_host_is_spi(card->host))
410 break;
411 } while (R1_CURRENT_STATE(status) == R1_STATE_PRG);
412
413 if (mmc_host_is_spi(card->host)) {
414 if (status & R1_SPI_ILLEGAL_COMMAND)
415 return -EBADMSG;
416 } else {
417 if (status & 0xFDFFA000)
418 pr_warning("%s: unexpected status %#x after "
419 "switch", mmc_hostname(card->host), status);
420 if (status & R1_SWITCH_ERROR)
421 return -EBADMSG;
422 }
423
424 return 0;
425}
426EXPORT_SYMBOL_GPL(mmc_switch);
427
428int mmc_send_status(struct mmc_card *card, u32 *status)
429{
430 int err;
431 struct mmc_command cmd = {0};
432
433 BUG_ON(!card);
434 BUG_ON(!card->host);
435
436 cmd.opcode = MMC_SEND_STATUS;
437 if (!mmc_host_is_spi(card->host))
438 cmd.arg = card->rca << 16;
439 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
440
441 err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
442 if (err)
443 return err;
444
445 /* NOTE: callers are required to understand the difference
446 * between "native" and SPI format status words!
447 */
448 if (status)
449 *status = cmd.resp[0];
450
451 return 0;
452}
453
454static int
455mmc_send_bus_test(struct mmc_card *card, struct mmc_host *host, u8 opcode,
456 u8 len)
457{
458 struct mmc_request mrq = {NULL};
459 struct mmc_command cmd = {0};
460 struct mmc_data data = {0};
461 struct scatterlist sg;
462 u8 *data_buf;
463 u8 *test_buf;
464 int i, err;
465 static u8 testdata_8bit[8] = { 0x55, 0xaa, 0, 0, 0, 0, 0, 0 };
466 static u8 testdata_4bit[4] = { 0x5a, 0, 0, 0 };
467
468 /* dma onto stack is unsafe/nonportable, but callers to this
469 * routine normally provide temporary on-stack buffers ...
470 */
471 data_buf = kmalloc(len, GFP_KERNEL);
472 if (!data_buf)
473 return -ENOMEM;
474
475 if (len == 8)
476 test_buf = testdata_8bit;
477 else if (len == 4)
478 test_buf = testdata_4bit;
479 else {
480 pr_err("%s: Invalid bus_width %d\n",
481 mmc_hostname(host), len);
482 kfree(data_buf);
483 return -EINVAL;
484 }
485
486 if (opcode == MMC_BUS_TEST_W)
487 memcpy(data_buf, test_buf, len);
488
489 mrq.cmd = &cmd;
490 mrq.data = &data;
491 cmd.opcode = opcode;
492 cmd.arg = 0;
493
494 /* NOTE HACK: the MMC_RSP_SPI_R1 is always correct here, but we
495 * rely on callers to never use this with "native" calls for reading
496 * CSD or CID. Native versions of those commands use the R2 type,
497 * not R1 plus a data block.
498 */
499 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
500
501 data.blksz = len;
502 data.blocks = 1;
503 if (opcode == MMC_BUS_TEST_R)
504 data.flags = MMC_DATA_READ;
505 else
506 data.flags = MMC_DATA_WRITE;
507
508 data.sg = &sg;
509 data.sg_len = 1;
510 sg_init_one(&sg, data_buf, len);
511 mmc_wait_for_req(host, &mrq);
512 err = 0;
513 if (opcode == MMC_BUS_TEST_R) {
514 for (i = 0; i < len / 4; i++)
515 if ((test_buf[i] ^ data_buf[i]) != 0xff) {
516 err = -EIO;
517 break;
518 }
519 }
520 kfree(data_buf);
521
522 if (cmd.error)
523 return cmd.error;
524 if (data.error)
525 return data.error;
526
527 return err;
528}
529
530int mmc_bus_test(struct mmc_card *card, u8 bus_width)
531{
532 int err, width;
533
534 if (bus_width == MMC_BUS_WIDTH_8)
535 width = 8;
536 else if (bus_width == MMC_BUS_WIDTH_4)
537 width = 4;
538 else if (bus_width == MMC_BUS_WIDTH_1)
539 return 0; /* no need for test */
540 else
541 return -EINVAL;
542
543 /*
544 * Ignore errors from BUS_TEST_W. BUS_TEST_R will fail if there
545 * is a problem. This improves chances that the test will work.
546 */
547 mmc_send_bus_test(card, card->host, MMC_BUS_TEST_W, width);
548 err = mmc_send_bus_test(card, card->host, MMC_BUS_TEST_R, width);
549 return err;
550}
551
552int mmc_send_hpi_cmd(struct mmc_card *card, u32 *status)
553{
554 struct mmc_command cmd = {0};
555 unsigned int opcode;
556 int err;
557
558 if (!card->ext_csd.hpi) {
559 pr_warning("%s: Card didn't support HPI command\n",
560 mmc_hostname(card->host));
561 return -EINVAL;
562 }
563
564 opcode = card->ext_csd.hpi_cmd;
565 if (opcode == MMC_STOP_TRANSMISSION)
566 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
567 else if (opcode == MMC_SEND_STATUS)
568 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
569
570 cmd.opcode = opcode;
571 cmd.arg = card->rca << 16 | 1;
572 cmd.cmd_timeout_ms = card->ext_csd.out_of_int_time;
573
574 err = mmc_wait_for_cmd(card->host, &cmd, 0);
575 if (err) {
576 pr_warn("%s: error %d interrupting operation. "
577 "HPI command response %#x\n", mmc_hostname(card->host),
578 err, cmd.resp[0]);
579 return err;
580 }
581 if (status)
582 *status = cmd.resp[0];
583
584 return 0;
585}
1/*
2 * linux/drivers/mmc/core/mmc_ops.h
3 *
4 * Copyright 2006-2007 Pierre Ossman
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or (at
9 * your option) any later version.
10 */
11
12#include <linux/slab.h>
13#include <linux/export.h>
14#include <linux/types.h>
15#include <linux/scatterlist.h>
16
17#include <linux/mmc/host.h>
18#include <linux/mmc/card.h>
19#include <linux/mmc/mmc.h>
20
21#include "core.h"
22#include "host.h"
23#include "mmc_ops.h"
24
25#define MMC_OPS_TIMEOUT_MS (10 * 60 * 1000) /* 10 minute timeout */
26
27static const u8 tuning_blk_pattern_4bit[] = {
28 0xff, 0x0f, 0xff, 0x00, 0xff, 0xcc, 0xc3, 0xcc,
29 0xc3, 0x3c, 0xcc, 0xff, 0xfe, 0xff, 0xfe, 0xef,
30 0xff, 0xdf, 0xff, 0xdd, 0xff, 0xfb, 0xff, 0xfb,
31 0xbf, 0xff, 0x7f, 0xff, 0x77, 0xf7, 0xbd, 0xef,
32 0xff, 0xf0, 0xff, 0xf0, 0x0f, 0xfc, 0xcc, 0x3c,
33 0xcc, 0x33, 0xcc, 0xcf, 0xff, 0xef, 0xff, 0xee,
34 0xff, 0xfd, 0xff, 0xfd, 0xdf, 0xff, 0xbf, 0xff,
35 0xbb, 0xff, 0xf7, 0xff, 0xf7, 0x7f, 0x7b, 0xde,
36};
37
38static const u8 tuning_blk_pattern_8bit[] = {
39 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00,
40 0xff, 0xff, 0xcc, 0xcc, 0xcc, 0x33, 0xcc, 0xcc,
41 0xcc, 0x33, 0x33, 0xcc, 0xcc, 0xcc, 0xff, 0xff,
42 0xff, 0xee, 0xff, 0xff, 0xff, 0xee, 0xee, 0xff,
43 0xff, 0xff, 0xdd, 0xff, 0xff, 0xff, 0xdd, 0xdd,
44 0xff, 0xff, 0xff, 0xbb, 0xff, 0xff, 0xff, 0xbb,
45 0xbb, 0xff, 0xff, 0xff, 0x77, 0xff, 0xff, 0xff,
46 0x77, 0x77, 0xff, 0x77, 0xbb, 0xdd, 0xee, 0xff,
47 0xff, 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0x00,
48 0x00, 0xff, 0xff, 0xcc, 0xcc, 0xcc, 0x33, 0xcc,
49 0xcc, 0xcc, 0x33, 0x33, 0xcc, 0xcc, 0xcc, 0xff,
50 0xff, 0xff, 0xee, 0xff, 0xff, 0xff, 0xee, 0xee,
51 0xff, 0xff, 0xff, 0xdd, 0xff, 0xff, 0xff, 0xdd,
52 0xdd, 0xff, 0xff, 0xff, 0xbb, 0xff, 0xff, 0xff,
53 0xbb, 0xbb, 0xff, 0xff, 0xff, 0x77, 0xff, 0xff,
54 0xff, 0x77, 0x77, 0xff, 0x77, 0xbb, 0xdd, 0xee,
55};
56
57int mmc_send_status(struct mmc_card *card, u32 *status)
58{
59 int err;
60 struct mmc_command cmd = {0};
61
62 cmd.opcode = MMC_SEND_STATUS;
63 if (!mmc_host_is_spi(card->host))
64 cmd.arg = card->rca << 16;
65 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
66
67 err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
68 if (err)
69 return err;
70
71 /* NOTE: callers are required to understand the difference
72 * between "native" and SPI format status words!
73 */
74 if (status)
75 *status = cmd.resp[0];
76
77 return 0;
78}
79
80static int _mmc_select_card(struct mmc_host *host, struct mmc_card *card)
81{
82 struct mmc_command cmd = {0};
83
84 cmd.opcode = MMC_SELECT_CARD;
85
86 if (card) {
87 cmd.arg = card->rca << 16;
88 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
89 } else {
90 cmd.arg = 0;
91 cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
92 }
93
94 return mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
95}
96
97int mmc_select_card(struct mmc_card *card)
98{
99
100 return _mmc_select_card(card->host, card);
101}
102
103int mmc_deselect_cards(struct mmc_host *host)
104{
105 return _mmc_select_card(host, NULL);
106}
107
108/*
109 * Write the value specified in the device tree or board code into the optional
110 * 16 bit Driver Stage Register. This can be used to tune raise/fall times and
111 * drive strength of the DAT and CMD outputs. The actual meaning of a given
112 * value is hardware dependant.
113 * The presence of the DSR register can be determined from the CSD register,
114 * bit 76.
115 */
116int mmc_set_dsr(struct mmc_host *host)
117{
118 struct mmc_command cmd = {0};
119
120 cmd.opcode = MMC_SET_DSR;
121
122 cmd.arg = (host->dsr << 16) | 0xffff;
123 cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
124
125 return mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
126}
127
128int mmc_go_idle(struct mmc_host *host)
129{
130 int err;
131 struct mmc_command cmd = {0};
132
133 /*
134 * Non-SPI hosts need to prevent chipselect going active during
135 * GO_IDLE; that would put chips into SPI mode. Remind them of
136 * that in case of hardware that won't pull up DAT3/nCS otherwise.
137 *
138 * SPI hosts ignore ios.chip_select; it's managed according to
139 * rules that must accommodate non-MMC slaves which this layer
140 * won't even know about.
141 */
142 if (!mmc_host_is_spi(host)) {
143 mmc_set_chip_select(host, MMC_CS_HIGH);
144 mmc_delay(1);
145 }
146
147 cmd.opcode = MMC_GO_IDLE_STATE;
148 cmd.arg = 0;
149 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_NONE | MMC_CMD_BC;
150
151 err = mmc_wait_for_cmd(host, &cmd, 0);
152
153 mmc_delay(1);
154
155 if (!mmc_host_is_spi(host)) {
156 mmc_set_chip_select(host, MMC_CS_DONTCARE);
157 mmc_delay(1);
158 }
159
160 host->use_spi_crc = 0;
161
162 return err;
163}
164
165int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
166{
167 struct mmc_command cmd = {0};
168 int i, err = 0;
169
170 cmd.opcode = MMC_SEND_OP_COND;
171 cmd.arg = mmc_host_is_spi(host) ? 0 : ocr;
172 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
173
174 for (i = 100; i; i--) {
175 err = mmc_wait_for_cmd(host, &cmd, 0);
176 if (err)
177 break;
178
179 /* if we're just probing, do a single pass */
180 if (ocr == 0)
181 break;
182
183 /* otherwise wait until reset completes */
184 if (mmc_host_is_spi(host)) {
185 if (!(cmd.resp[0] & R1_SPI_IDLE))
186 break;
187 } else {
188 if (cmd.resp[0] & MMC_CARD_BUSY)
189 break;
190 }
191
192 err = -ETIMEDOUT;
193
194 mmc_delay(10);
195 }
196
197 if (rocr && !mmc_host_is_spi(host))
198 *rocr = cmd.resp[0];
199
200 return err;
201}
202
203int mmc_all_send_cid(struct mmc_host *host, u32 *cid)
204{
205 int err;
206 struct mmc_command cmd = {0};
207
208 cmd.opcode = MMC_ALL_SEND_CID;
209 cmd.arg = 0;
210 cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR;
211
212 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
213 if (err)
214 return err;
215
216 memcpy(cid, cmd.resp, sizeof(u32) * 4);
217
218 return 0;
219}
220
221int mmc_set_relative_addr(struct mmc_card *card)
222{
223 struct mmc_command cmd = {0};
224
225 cmd.opcode = MMC_SET_RELATIVE_ADDR;
226 cmd.arg = card->rca << 16;
227 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
228
229 return mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
230}
231
232static int
233mmc_send_cxd_native(struct mmc_host *host, u32 arg, u32 *cxd, int opcode)
234{
235 int err;
236 struct mmc_command cmd = {0};
237
238 cmd.opcode = opcode;
239 cmd.arg = arg;
240 cmd.flags = MMC_RSP_R2 | MMC_CMD_AC;
241
242 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
243 if (err)
244 return err;
245
246 memcpy(cxd, cmd.resp, sizeof(u32) * 4);
247
248 return 0;
249}
250
251/*
252 * NOTE: void *buf, caller for the buf is required to use DMA-capable
253 * buffer or on-stack buffer (with some overhead in callee).
254 */
255static int
256mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host,
257 u32 opcode, void *buf, unsigned len)
258{
259 struct mmc_request mrq = {NULL};
260 struct mmc_command cmd = {0};
261 struct mmc_data data = {0};
262 struct scatterlist sg;
263
264 mrq.cmd = &cmd;
265 mrq.data = &data;
266
267 cmd.opcode = opcode;
268 cmd.arg = 0;
269
270 /* NOTE HACK: the MMC_RSP_SPI_R1 is always correct here, but we
271 * rely on callers to never use this with "native" calls for reading
272 * CSD or CID. Native versions of those commands use the R2 type,
273 * not R1 plus a data block.
274 */
275 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
276
277 data.blksz = len;
278 data.blocks = 1;
279 data.flags = MMC_DATA_READ;
280 data.sg = &sg;
281 data.sg_len = 1;
282
283 sg_init_one(&sg, buf, len);
284
285 if (opcode == MMC_SEND_CSD || opcode == MMC_SEND_CID) {
286 /*
287 * The spec states that CSR and CID accesses have a timeout
288 * of 64 clock cycles.
289 */
290 data.timeout_ns = 0;
291 data.timeout_clks = 64;
292 } else
293 mmc_set_data_timeout(&data, card);
294
295 mmc_wait_for_req(host, &mrq);
296
297 if (cmd.error)
298 return cmd.error;
299 if (data.error)
300 return data.error;
301
302 return 0;
303}
304
305int mmc_send_csd(struct mmc_card *card, u32 *csd)
306{
307 int ret, i;
308 u32 *csd_tmp;
309
310 if (!mmc_host_is_spi(card->host))
311 return mmc_send_cxd_native(card->host, card->rca << 16,
312 csd, MMC_SEND_CSD);
313
314 csd_tmp = kzalloc(16, GFP_KERNEL);
315 if (!csd_tmp)
316 return -ENOMEM;
317
318 ret = mmc_send_cxd_data(card, card->host, MMC_SEND_CSD, csd_tmp, 16);
319 if (ret)
320 goto err;
321
322 for (i = 0;i < 4;i++)
323 csd[i] = be32_to_cpu(csd_tmp[i]);
324
325err:
326 kfree(csd_tmp);
327 return ret;
328}
329
330int mmc_send_cid(struct mmc_host *host, u32 *cid)
331{
332 int ret, i;
333 u32 *cid_tmp;
334
335 if (!mmc_host_is_spi(host)) {
336 if (!host->card)
337 return -EINVAL;
338 return mmc_send_cxd_native(host, host->card->rca << 16,
339 cid, MMC_SEND_CID);
340 }
341
342 cid_tmp = kzalloc(16, GFP_KERNEL);
343 if (!cid_tmp)
344 return -ENOMEM;
345
346 ret = mmc_send_cxd_data(NULL, host, MMC_SEND_CID, cid_tmp, 16);
347 if (ret)
348 goto err;
349
350 for (i = 0;i < 4;i++)
351 cid[i] = be32_to_cpu(cid_tmp[i]);
352
353err:
354 kfree(cid_tmp);
355 return ret;
356}
357
358int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd)
359{
360 int err;
361 u8 *ext_csd;
362
363 if (!card || !new_ext_csd)
364 return -EINVAL;
365
366 if (!mmc_can_ext_csd(card))
367 return -EOPNOTSUPP;
368
369 /*
370 * As the ext_csd is so large and mostly unused, we don't store the
371 * raw block in mmc_card.
372 */
373 ext_csd = kzalloc(512, GFP_KERNEL);
374 if (!ext_csd)
375 return -ENOMEM;
376
377 err = mmc_send_cxd_data(card, card->host, MMC_SEND_EXT_CSD, ext_csd,
378 512);
379 if (err)
380 kfree(ext_csd);
381 else
382 *new_ext_csd = ext_csd;
383
384 return err;
385}
386EXPORT_SYMBOL_GPL(mmc_get_ext_csd);
387
388int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp)
389{
390 struct mmc_command cmd = {0};
391 int err;
392
393 cmd.opcode = MMC_SPI_READ_OCR;
394 cmd.arg = highcap ? (1 << 30) : 0;
395 cmd.flags = MMC_RSP_SPI_R3;
396
397 err = mmc_wait_for_cmd(host, &cmd, 0);
398
399 *ocrp = cmd.resp[1];
400 return err;
401}
402
403int mmc_spi_set_crc(struct mmc_host *host, int use_crc)
404{
405 struct mmc_command cmd = {0};
406 int err;
407
408 cmd.opcode = MMC_SPI_CRC_ON_OFF;
409 cmd.flags = MMC_RSP_SPI_R1;
410 cmd.arg = use_crc;
411
412 err = mmc_wait_for_cmd(host, &cmd, 0);
413 if (!err)
414 host->use_spi_crc = use_crc;
415 return err;
416}
417
418static int mmc_switch_status_error(struct mmc_host *host, u32 status)
419{
420 if (mmc_host_is_spi(host)) {
421 if (status & R1_SPI_ILLEGAL_COMMAND)
422 return -EBADMSG;
423 } else {
424 if (status & 0xFDFFA000)
425 pr_warn("%s: unexpected status %#x after switch\n",
426 mmc_hostname(host), status);
427 if (status & R1_SWITCH_ERROR)
428 return -EBADMSG;
429 }
430 return 0;
431}
432
433/* Caller must hold re-tuning */
434int __mmc_switch_status(struct mmc_card *card, bool crc_err_fatal)
435{
436 u32 status;
437 int err;
438
439 err = mmc_send_status(card, &status);
440 if (!crc_err_fatal && err == -EILSEQ)
441 return 0;
442 if (err)
443 return err;
444
445 return mmc_switch_status_error(card->host, status);
446}
447
448int mmc_switch_status(struct mmc_card *card)
449{
450 return __mmc_switch_status(card, true);
451}
452
453static int mmc_poll_for_busy(struct mmc_card *card, unsigned int timeout_ms,
454 bool send_status, bool retry_crc_err)
455{
456 struct mmc_host *host = card->host;
457 int err;
458 unsigned long timeout;
459 u32 status = 0;
460 bool expired = false;
461 bool busy = false;
462
463 /* We have an unspecified cmd timeout, use the fallback value. */
464 if (!timeout_ms)
465 timeout_ms = MMC_OPS_TIMEOUT_MS;
466
467 /*
468 * In cases when not allowed to poll by using CMD13 or because we aren't
469 * capable of polling by using ->card_busy(), then rely on waiting the
470 * stated timeout to be sufficient.
471 */
472 if (!send_status && !host->ops->card_busy) {
473 mmc_delay(timeout_ms);
474 return 0;
475 }
476
477 timeout = jiffies + msecs_to_jiffies(timeout_ms) + 1;
478 do {
479 /*
480 * Due to the possibility of being preempted while polling,
481 * check the expiration time first.
482 */
483 expired = time_after(jiffies, timeout);
484
485 if (host->ops->card_busy) {
486 busy = host->ops->card_busy(host);
487 } else {
488 err = mmc_send_status(card, &status);
489 if (retry_crc_err && err == -EILSEQ) {
490 busy = true;
491 } else if (err) {
492 return err;
493 } else {
494 err = mmc_switch_status_error(host, status);
495 if (err)
496 return err;
497 busy = R1_CURRENT_STATE(status) == R1_STATE_PRG;
498 }
499 }
500
501 /* Timeout if the device still remains busy. */
502 if (expired && busy) {
503 pr_err("%s: Card stuck being busy! %s\n",
504 mmc_hostname(host), __func__);
505 return -ETIMEDOUT;
506 }
507 } while (busy);
508
509 return 0;
510}
511
512/**
513 * __mmc_switch - modify EXT_CSD register
514 * @card: the MMC card associated with the data transfer
515 * @set: cmd set values
516 * @index: EXT_CSD register index
517 * @value: value to program into EXT_CSD register
518 * @timeout_ms: timeout (ms) for operation performed by register write,
519 * timeout of zero implies maximum possible timeout
520 * @timing: new timing to change to
521 * @use_busy_signal: use the busy signal as response type
522 * @send_status: send status cmd to poll for busy
523 * @retry_crc_err: retry when CRC errors when polling with CMD13 for busy
524 *
525 * Modifies the EXT_CSD register for selected card.
526 */
527int __mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
528 unsigned int timeout_ms, unsigned char timing,
529 bool use_busy_signal, bool send_status, bool retry_crc_err)
530{
531 struct mmc_host *host = card->host;
532 int err;
533 struct mmc_command cmd = {0};
534 bool use_r1b_resp = use_busy_signal;
535 unsigned char old_timing = host->ios.timing;
536
537 mmc_retune_hold(host);
538
539 /*
540 * If the cmd timeout and the max_busy_timeout of the host are both
541 * specified, let's validate them. A failure means we need to prevent
542 * the host from doing hw busy detection, which is done by converting
543 * to a R1 response instead of a R1B.
544 */
545 if (timeout_ms && host->max_busy_timeout &&
546 (timeout_ms > host->max_busy_timeout))
547 use_r1b_resp = false;
548
549 cmd.opcode = MMC_SWITCH;
550 cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
551 (index << 16) |
552 (value << 8) |
553 set;
554 cmd.flags = MMC_CMD_AC;
555 if (use_r1b_resp) {
556 cmd.flags |= MMC_RSP_SPI_R1B | MMC_RSP_R1B;
557 /*
558 * A busy_timeout of zero means the host can decide to use
559 * whatever value it finds suitable.
560 */
561 cmd.busy_timeout = timeout_ms;
562 } else {
563 cmd.flags |= MMC_RSP_SPI_R1 | MMC_RSP_R1;
564 }
565
566 if (index == EXT_CSD_SANITIZE_START)
567 cmd.sanitize_busy = true;
568
569 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
570 if (err)
571 goto out;
572
573 /* No need to check card status in case of unblocking command */
574 if (!use_busy_signal)
575 goto out;
576
577 /*If SPI or used HW busy detection above, then we don't need to poll. */
578 if (((host->caps & MMC_CAP_WAIT_WHILE_BUSY) && use_r1b_resp) ||
579 mmc_host_is_spi(host))
580 goto out_tim;
581
582 /* Let's try to poll to find out when the command is completed. */
583 err = mmc_poll_for_busy(card, timeout_ms, send_status, retry_crc_err);
584 if (err)
585 goto out;
586
587out_tim:
588 /* Switch to new timing before check switch status. */
589 if (timing)
590 mmc_set_timing(host, timing);
591
592 if (send_status) {
593 err = mmc_switch_status(card);
594 if (err && timing)
595 mmc_set_timing(host, old_timing);
596 }
597out:
598 mmc_retune_release(host);
599
600 return err;
601}
602
603int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
604 unsigned int timeout_ms)
605{
606 return __mmc_switch(card, set, index, value, timeout_ms, 0,
607 true, true, false);
608}
609EXPORT_SYMBOL_GPL(mmc_switch);
610
611int mmc_send_tuning(struct mmc_host *host, u32 opcode, int *cmd_error)
612{
613 struct mmc_request mrq = {NULL};
614 struct mmc_command cmd = {0};
615 struct mmc_data data = {0};
616 struct scatterlist sg;
617 struct mmc_ios *ios = &host->ios;
618 const u8 *tuning_block_pattern;
619 int size, err = 0;
620 u8 *data_buf;
621
622 if (ios->bus_width == MMC_BUS_WIDTH_8) {
623 tuning_block_pattern = tuning_blk_pattern_8bit;
624 size = sizeof(tuning_blk_pattern_8bit);
625 } else if (ios->bus_width == MMC_BUS_WIDTH_4) {
626 tuning_block_pattern = tuning_blk_pattern_4bit;
627 size = sizeof(tuning_blk_pattern_4bit);
628 } else
629 return -EINVAL;
630
631 data_buf = kzalloc(size, GFP_KERNEL);
632 if (!data_buf)
633 return -ENOMEM;
634
635 mrq.cmd = &cmd;
636 mrq.data = &data;
637
638 cmd.opcode = opcode;
639 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
640
641 data.blksz = size;
642 data.blocks = 1;
643 data.flags = MMC_DATA_READ;
644
645 /*
646 * According to the tuning specs, Tuning process
647 * is normally shorter 40 executions of CMD19,
648 * and timeout value should be shorter than 150 ms
649 */
650 data.timeout_ns = 150 * NSEC_PER_MSEC;
651
652 data.sg = &sg;
653 data.sg_len = 1;
654 sg_init_one(&sg, data_buf, size);
655
656 mmc_wait_for_req(host, &mrq);
657
658 if (cmd_error)
659 *cmd_error = cmd.error;
660
661 if (cmd.error) {
662 err = cmd.error;
663 goto out;
664 }
665
666 if (data.error) {
667 err = data.error;
668 goto out;
669 }
670
671 if (memcmp(data_buf, tuning_block_pattern, size))
672 err = -EIO;
673
674out:
675 kfree(data_buf);
676 return err;
677}
678EXPORT_SYMBOL_GPL(mmc_send_tuning);
679
680int mmc_abort_tuning(struct mmc_host *host, u32 opcode)
681{
682 struct mmc_command cmd = {0};
683
684 /*
685 * eMMC specification specifies that CMD12 can be used to stop a tuning
686 * command, but SD specification does not, so do nothing unless it is
687 * eMMC.
688 */
689 if (opcode != MMC_SEND_TUNING_BLOCK_HS200)
690 return 0;
691
692 cmd.opcode = MMC_STOP_TRANSMISSION;
693 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
694
695 /*
696 * For drivers that override R1 to R1b, set an arbitrary timeout based
697 * on the tuning timeout i.e. 150ms.
698 */
699 cmd.busy_timeout = 150;
700
701 return mmc_wait_for_cmd(host, &cmd, 0);
702}
703EXPORT_SYMBOL_GPL(mmc_abort_tuning);
704
705static int
706mmc_send_bus_test(struct mmc_card *card, struct mmc_host *host, u8 opcode,
707 u8 len)
708{
709 struct mmc_request mrq = {NULL};
710 struct mmc_command cmd = {0};
711 struct mmc_data data = {0};
712 struct scatterlist sg;
713 u8 *data_buf;
714 u8 *test_buf;
715 int i, err;
716 static u8 testdata_8bit[8] = { 0x55, 0xaa, 0, 0, 0, 0, 0, 0 };
717 static u8 testdata_4bit[4] = { 0x5a, 0, 0, 0 };
718
719 /* dma onto stack is unsafe/nonportable, but callers to this
720 * routine normally provide temporary on-stack buffers ...
721 */
722 data_buf = kmalloc(len, GFP_KERNEL);
723 if (!data_buf)
724 return -ENOMEM;
725
726 if (len == 8)
727 test_buf = testdata_8bit;
728 else if (len == 4)
729 test_buf = testdata_4bit;
730 else {
731 pr_err("%s: Invalid bus_width %d\n",
732 mmc_hostname(host), len);
733 kfree(data_buf);
734 return -EINVAL;
735 }
736
737 if (opcode == MMC_BUS_TEST_W)
738 memcpy(data_buf, test_buf, len);
739
740 mrq.cmd = &cmd;
741 mrq.data = &data;
742 cmd.opcode = opcode;
743 cmd.arg = 0;
744
745 /* NOTE HACK: the MMC_RSP_SPI_R1 is always correct here, but we
746 * rely on callers to never use this with "native" calls for reading
747 * CSD or CID. Native versions of those commands use the R2 type,
748 * not R1 plus a data block.
749 */
750 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
751
752 data.blksz = len;
753 data.blocks = 1;
754 if (opcode == MMC_BUS_TEST_R)
755 data.flags = MMC_DATA_READ;
756 else
757 data.flags = MMC_DATA_WRITE;
758
759 data.sg = &sg;
760 data.sg_len = 1;
761 mmc_set_data_timeout(&data, card);
762 sg_init_one(&sg, data_buf, len);
763 mmc_wait_for_req(host, &mrq);
764 err = 0;
765 if (opcode == MMC_BUS_TEST_R) {
766 for (i = 0; i < len / 4; i++)
767 if ((test_buf[i] ^ data_buf[i]) != 0xff) {
768 err = -EIO;
769 break;
770 }
771 }
772 kfree(data_buf);
773
774 if (cmd.error)
775 return cmd.error;
776 if (data.error)
777 return data.error;
778
779 return err;
780}
781
782int mmc_bus_test(struct mmc_card *card, u8 bus_width)
783{
784 int width;
785
786 if (bus_width == MMC_BUS_WIDTH_8)
787 width = 8;
788 else if (bus_width == MMC_BUS_WIDTH_4)
789 width = 4;
790 else if (bus_width == MMC_BUS_WIDTH_1)
791 return 0; /* no need for test */
792 else
793 return -EINVAL;
794
795 /*
796 * Ignore errors from BUS_TEST_W. BUS_TEST_R will fail if there
797 * is a problem. This improves chances that the test will work.
798 */
799 mmc_send_bus_test(card, card->host, MMC_BUS_TEST_W, width);
800 return mmc_send_bus_test(card, card->host, MMC_BUS_TEST_R, width);
801}
802
803int mmc_send_hpi_cmd(struct mmc_card *card, u32 *status)
804{
805 struct mmc_command cmd = {0};
806 unsigned int opcode;
807 int err;
808
809 if (!card->ext_csd.hpi) {
810 pr_warn("%s: Card didn't support HPI command\n",
811 mmc_hostname(card->host));
812 return -EINVAL;
813 }
814
815 opcode = card->ext_csd.hpi_cmd;
816 if (opcode == MMC_STOP_TRANSMISSION)
817 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
818 else if (opcode == MMC_SEND_STATUS)
819 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
820
821 cmd.opcode = opcode;
822 cmd.arg = card->rca << 16 | 1;
823
824 err = mmc_wait_for_cmd(card->host, &cmd, 0);
825 if (err) {
826 pr_warn("%s: error %d interrupting operation. "
827 "HPI command response %#x\n", mmc_hostname(card->host),
828 err, cmd.resp[0]);
829 return err;
830 }
831 if (status)
832 *status = cmd.resp[0];
833
834 return 0;
835}
836
837int mmc_can_ext_csd(struct mmc_card *card)
838{
839 return (card && card->csd.mmca_vsn > CSD_SPEC_VER_3);
840}