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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 "mmc_ops.h"
23
24#define MMC_OPS_TIMEOUT_MS (10 * 60 * 1000) /* 10 minute timeout */
25
26static inline int __mmc_send_status(struct mmc_card *card, u32 *status,
27 bool ignore_crc)
28{
29 int err;
30 struct mmc_command cmd = {0};
31
32 BUG_ON(!card);
33 BUG_ON(!card->host);
34
35 cmd.opcode = MMC_SEND_STATUS;
36 if (!mmc_host_is_spi(card->host))
37 cmd.arg = card->rca << 16;
38 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
39 if (ignore_crc)
40 cmd.flags &= ~MMC_RSP_CRC;
41
42 err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
43 if (err)
44 return err;
45
46 /* NOTE: callers are required to understand the difference
47 * between "native" and SPI format status words!
48 */
49 if (status)
50 *status = cmd.resp[0];
51
52 return 0;
53}
54
55int mmc_send_status(struct mmc_card *card, u32 *status)
56{
57 return __mmc_send_status(card, status, false);
58}
59
60static int _mmc_select_card(struct mmc_host *host, struct mmc_card *card)
61{
62 int err;
63 struct mmc_command cmd = {0};
64
65 BUG_ON(!host);
66
67 cmd.opcode = MMC_SELECT_CARD;
68
69 if (card) {
70 cmd.arg = card->rca << 16;
71 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
72 } else {
73 cmd.arg = 0;
74 cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
75 }
76
77 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
78 if (err)
79 return err;
80
81 return 0;
82}
83
84int mmc_select_card(struct mmc_card *card)
85{
86 BUG_ON(!card);
87
88 return _mmc_select_card(card->host, card);
89}
90
91int mmc_deselect_cards(struct mmc_host *host)
92{
93 return _mmc_select_card(host, NULL);
94}
95
96int mmc_go_idle(struct mmc_host *host)
97{
98 int err;
99 struct mmc_command cmd = {0};
100
101 /*
102 * Non-SPI hosts need to prevent chipselect going active during
103 * GO_IDLE; that would put chips into SPI mode. Remind them of
104 * that in case of hardware that won't pull up DAT3/nCS otherwise.
105 *
106 * SPI hosts ignore ios.chip_select; it's managed according to
107 * rules that must accommodate non-MMC slaves which this layer
108 * won't even know about.
109 */
110 if (!mmc_host_is_spi(host)) {
111 mmc_set_chip_select(host, MMC_CS_HIGH);
112 mmc_delay(1);
113 }
114
115 cmd.opcode = MMC_GO_IDLE_STATE;
116 cmd.arg = 0;
117 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_NONE | MMC_CMD_BC;
118
119 err = mmc_wait_for_cmd(host, &cmd, 0);
120
121 mmc_delay(1);
122
123 if (!mmc_host_is_spi(host)) {
124 mmc_set_chip_select(host, MMC_CS_DONTCARE);
125 mmc_delay(1);
126 }
127
128 host->use_spi_crc = 0;
129
130 return err;
131}
132
133int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
134{
135 struct mmc_command cmd = {0};
136 int i, err = 0;
137
138 BUG_ON(!host);
139
140 cmd.opcode = MMC_SEND_OP_COND;
141 cmd.arg = mmc_host_is_spi(host) ? 0 : ocr;
142 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
143
144 for (i = 100; i; i--) {
145 err = mmc_wait_for_cmd(host, &cmd, 0);
146 if (err)
147 break;
148
149 /* if we're just probing, do a single pass */
150 if (ocr == 0)
151 break;
152
153 /* otherwise wait until reset completes */
154 if (mmc_host_is_spi(host)) {
155 if (!(cmd.resp[0] & R1_SPI_IDLE))
156 break;
157 } else {
158 if (cmd.resp[0] & MMC_CARD_BUSY)
159 break;
160 }
161
162 err = -ETIMEDOUT;
163
164 mmc_delay(10);
165 }
166
167 if (rocr && !mmc_host_is_spi(host))
168 *rocr = cmd.resp[0];
169
170 return err;
171}
172
173int mmc_all_send_cid(struct mmc_host *host, u32 *cid)
174{
175 int err;
176 struct mmc_command cmd = {0};
177
178 BUG_ON(!host);
179 BUG_ON(!cid);
180
181 cmd.opcode = MMC_ALL_SEND_CID;
182 cmd.arg = 0;
183 cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR;
184
185 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
186 if (err)
187 return err;
188
189 memcpy(cid, cmd.resp, sizeof(u32) * 4);
190
191 return 0;
192}
193
194int mmc_set_relative_addr(struct mmc_card *card)
195{
196 int err;
197 struct mmc_command cmd = {0};
198
199 BUG_ON(!card);
200 BUG_ON(!card->host);
201
202 cmd.opcode = MMC_SET_RELATIVE_ADDR;
203 cmd.arg = card->rca << 16;
204 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
205
206 err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
207 if (err)
208 return err;
209
210 return 0;
211}
212
213static int
214mmc_send_cxd_native(struct mmc_host *host, u32 arg, u32 *cxd, int opcode)
215{
216 int err;
217 struct mmc_command cmd = {0};
218
219 BUG_ON(!host);
220 BUG_ON(!cxd);
221
222 cmd.opcode = opcode;
223 cmd.arg = arg;
224 cmd.flags = MMC_RSP_R2 | MMC_CMD_AC;
225
226 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
227 if (err)
228 return err;
229
230 memcpy(cxd, cmd.resp, sizeof(u32) * 4);
231
232 return 0;
233}
234
235/*
236 * NOTE: void *buf, caller for the buf is required to use DMA-capable
237 * buffer or on-stack buffer (with some overhead in callee).
238 */
239static int
240mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host,
241 u32 opcode, void *buf, unsigned len)
242{
243 struct mmc_request mrq = {NULL};
244 struct mmc_command cmd = {0};
245 struct mmc_data data = {0};
246 struct scatterlist sg;
247 void *data_buf;
248 int is_on_stack;
249
250 is_on_stack = object_is_on_stack(buf);
251 if (is_on_stack) {
252 /*
253 * dma onto stack is unsafe/nonportable, but callers to this
254 * routine normally provide temporary on-stack buffers ...
255 */
256 data_buf = kmalloc(len, GFP_KERNEL);
257 if (!data_buf)
258 return -ENOMEM;
259 } else
260 data_buf = buf;
261
262 mrq.cmd = &cmd;
263 mrq.data = &data;
264
265 cmd.opcode = opcode;
266 cmd.arg = 0;
267
268 /* NOTE HACK: the MMC_RSP_SPI_R1 is always correct here, but we
269 * rely on callers to never use this with "native" calls for reading
270 * CSD or CID. Native versions of those commands use the R2 type,
271 * not R1 plus a data block.
272 */
273 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
274
275 data.blksz = len;
276 data.blocks = 1;
277 data.flags = MMC_DATA_READ;
278 data.sg = &sg;
279 data.sg_len = 1;
280
281 sg_init_one(&sg, data_buf, len);
282
283 if (opcode == MMC_SEND_CSD || opcode == MMC_SEND_CID) {
284 /*
285 * The spec states that CSR and CID accesses have a timeout
286 * of 64 clock cycles.
287 */
288 data.timeout_ns = 0;
289 data.timeout_clks = 64;
290 } else
291 mmc_set_data_timeout(&data, card);
292
293 mmc_wait_for_req(host, &mrq);
294
295 if (is_on_stack) {
296 memcpy(buf, data_buf, len);
297 kfree(data_buf);
298 }
299
300 if (cmd.error)
301 return cmd.error;
302 if (data.error)
303 return data.error;
304
305 return 0;
306}
307
308int mmc_send_csd(struct mmc_card *card, u32 *csd)
309{
310 int ret, i;
311 u32 *csd_tmp;
312
313 if (!mmc_host_is_spi(card->host))
314 return mmc_send_cxd_native(card->host, card->rca << 16,
315 csd, MMC_SEND_CSD);
316
317 csd_tmp = kmalloc(16, GFP_KERNEL);
318 if (!csd_tmp)
319 return -ENOMEM;
320
321 ret = mmc_send_cxd_data(card, card->host, MMC_SEND_CSD, csd_tmp, 16);
322 if (ret)
323 goto err;
324
325 for (i = 0;i < 4;i++)
326 csd[i] = be32_to_cpu(csd_tmp[i]);
327
328err:
329 kfree(csd_tmp);
330 return ret;
331}
332
333int mmc_send_cid(struct mmc_host *host, u32 *cid)
334{
335 int ret, i;
336 u32 *cid_tmp;
337
338 if (!mmc_host_is_spi(host)) {
339 if (!host->card)
340 return -EINVAL;
341 return mmc_send_cxd_native(host, host->card->rca << 16,
342 cid, MMC_SEND_CID);
343 }
344
345 cid_tmp = kmalloc(16, GFP_KERNEL);
346 if (!cid_tmp)
347 return -ENOMEM;
348
349 ret = mmc_send_cxd_data(NULL, host, MMC_SEND_CID, cid_tmp, 16);
350 if (ret)
351 goto err;
352
353 for (i = 0;i < 4;i++)
354 cid[i] = be32_to_cpu(cid_tmp[i]);
355
356err:
357 kfree(cid_tmp);
358 return ret;
359}
360
361int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd)
362{
363 return mmc_send_cxd_data(card, card->host, MMC_SEND_EXT_CSD,
364 ext_csd, 512);
365}
366EXPORT_SYMBOL_GPL(mmc_send_ext_csd);
367
368int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp)
369{
370 struct mmc_command cmd = {0};
371 int err;
372
373 cmd.opcode = MMC_SPI_READ_OCR;
374 cmd.arg = highcap ? (1 << 30) : 0;
375 cmd.flags = MMC_RSP_SPI_R3;
376
377 err = mmc_wait_for_cmd(host, &cmd, 0);
378
379 *ocrp = cmd.resp[1];
380 return err;
381}
382
383int mmc_spi_set_crc(struct mmc_host *host, int use_crc)
384{
385 struct mmc_command cmd = {0};
386 int err;
387
388 cmd.opcode = MMC_SPI_CRC_ON_OFF;
389 cmd.flags = MMC_RSP_SPI_R1;
390 cmd.arg = use_crc;
391
392 err = mmc_wait_for_cmd(host, &cmd, 0);
393 if (!err)
394 host->use_spi_crc = use_crc;
395 return err;
396}
397
398/**
399 * __mmc_switch - modify EXT_CSD register
400 * @card: the MMC card associated with the data transfer
401 * @set: cmd set values
402 * @index: EXT_CSD register index
403 * @value: value to program into EXT_CSD register
404 * @timeout_ms: timeout (ms) for operation performed by register write,
405 * timeout of zero implies maximum possible timeout
406 * @use_busy_signal: use the busy signal as response type
407 * @send_status: send status cmd to poll for busy
408 * @ignore_crc: ignore CRC errors when sending status cmd to poll for busy
409 *
410 * Modifies the EXT_CSD register for selected card.
411 */
412int __mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
413 unsigned int timeout_ms, bool use_busy_signal, bool send_status,
414 bool ignore_crc)
415{
416 struct mmc_host *host = card->host;
417 int err;
418 struct mmc_command cmd = {0};
419 unsigned long timeout;
420 u32 status = 0;
421 bool use_r1b_resp = use_busy_signal;
422
423 /*
424 * If the cmd timeout and the max_busy_timeout of the host are both
425 * specified, let's validate them. A failure means we need to prevent
426 * the host from doing hw busy detection, which is done by converting
427 * to a R1 response instead of a R1B.
428 */
429 if (timeout_ms && host->max_busy_timeout &&
430 (timeout_ms > host->max_busy_timeout))
431 use_r1b_resp = false;
432
433 cmd.opcode = MMC_SWITCH;
434 cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
435 (index << 16) |
436 (value << 8) |
437 set;
438 cmd.flags = MMC_CMD_AC;
439 if (use_r1b_resp) {
440 cmd.flags |= MMC_RSP_SPI_R1B | MMC_RSP_R1B;
441 /*
442 * A busy_timeout of zero means the host can decide to use
443 * whatever value it finds suitable.
444 */
445 cmd.busy_timeout = timeout_ms;
446 } else {
447 cmd.flags |= MMC_RSP_SPI_R1 | MMC_RSP_R1;
448 }
449
450 if (index == EXT_CSD_SANITIZE_START)
451 cmd.sanitize_busy = true;
452
453 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
454 if (err)
455 return err;
456
457 /* No need to check card status in case of unblocking command */
458 if (!use_busy_signal)
459 return 0;
460
461 /*
462 * CRC errors shall only be ignored in cases were CMD13 is used to poll
463 * to detect busy completion.
464 */
465 if ((host->caps & MMC_CAP_WAIT_WHILE_BUSY) && use_r1b_resp)
466 ignore_crc = false;
467
468 /* We have an unspecified cmd timeout, use the fallback value. */
469 if (!timeout_ms)
470 timeout_ms = MMC_OPS_TIMEOUT_MS;
471
472 /* Must check status to be sure of no errors. */
473 timeout = jiffies + msecs_to_jiffies(timeout_ms);
474 do {
475 if (send_status) {
476 err = __mmc_send_status(card, &status, ignore_crc);
477 if (err)
478 return err;
479 }
480 if ((host->caps & MMC_CAP_WAIT_WHILE_BUSY) && use_r1b_resp)
481 break;
482 if (mmc_host_is_spi(host))
483 break;
484
485 /*
486 * We are not allowed to issue a status command and the host
487 * does'nt support MMC_CAP_WAIT_WHILE_BUSY, then we can only
488 * rely on waiting for the stated timeout to be sufficient.
489 */
490 if (!send_status) {
491 mmc_delay(timeout_ms);
492 return 0;
493 }
494
495 /* Timeout if the device never leaves the program state. */
496 if (time_after(jiffies, timeout)) {
497 pr_err("%s: Card stuck in programming state! %s\n",
498 mmc_hostname(host), __func__);
499 return -ETIMEDOUT;
500 }
501 } while (R1_CURRENT_STATE(status) == R1_STATE_PRG);
502
503 if (mmc_host_is_spi(host)) {
504 if (status & R1_SPI_ILLEGAL_COMMAND)
505 return -EBADMSG;
506 } else {
507 if (status & 0xFDFFA000)
508 pr_warn("%s: unexpected status %#x after switch\n",
509 mmc_hostname(host), status);
510 if (status & R1_SWITCH_ERROR)
511 return -EBADMSG;
512 }
513
514 return 0;
515}
516EXPORT_SYMBOL_GPL(__mmc_switch);
517
518int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
519 unsigned int timeout_ms)
520{
521 return __mmc_switch(card, set, index, value, timeout_ms, true, true,
522 false);
523}
524EXPORT_SYMBOL_GPL(mmc_switch);
525
526static int
527mmc_send_bus_test(struct mmc_card *card, struct mmc_host *host, u8 opcode,
528 u8 len)
529{
530 struct mmc_request mrq = {NULL};
531 struct mmc_command cmd = {0};
532 struct mmc_data data = {0};
533 struct scatterlist sg;
534 u8 *data_buf;
535 u8 *test_buf;
536 int i, err;
537 static u8 testdata_8bit[8] = { 0x55, 0xaa, 0, 0, 0, 0, 0, 0 };
538 static u8 testdata_4bit[4] = { 0x5a, 0, 0, 0 };
539
540 /* dma onto stack is unsafe/nonportable, but callers to this
541 * routine normally provide temporary on-stack buffers ...
542 */
543 data_buf = kmalloc(len, GFP_KERNEL);
544 if (!data_buf)
545 return -ENOMEM;
546
547 if (len == 8)
548 test_buf = testdata_8bit;
549 else if (len == 4)
550 test_buf = testdata_4bit;
551 else {
552 pr_err("%s: Invalid bus_width %d\n",
553 mmc_hostname(host), len);
554 kfree(data_buf);
555 return -EINVAL;
556 }
557
558 if (opcode == MMC_BUS_TEST_W)
559 memcpy(data_buf, test_buf, len);
560
561 mrq.cmd = &cmd;
562 mrq.data = &data;
563 cmd.opcode = opcode;
564 cmd.arg = 0;
565
566 /* NOTE HACK: the MMC_RSP_SPI_R1 is always correct here, but we
567 * rely on callers to never use this with "native" calls for reading
568 * CSD or CID. Native versions of those commands use the R2 type,
569 * not R1 plus a data block.
570 */
571 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
572
573 data.blksz = len;
574 data.blocks = 1;
575 if (opcode == MMC_BUS_TEST_R)
576 data.flags = MMC_DATA_READ;
577 else
578 data.flags = MMC_DATA_WRITE;
579
580 data.sg = &sg;
581 data.sg_len = 1;
582 mmc_set_data_timeout(&data, card);
583 sg_init_one(&sg, data_buf, len);
584 mmc_wait_for_req(host, &mrq);
585 err = 0;
586 if (opcode == MMC_BUS_TEST_R) {
587 for (i = 0; i < len / 4; i++)
588 if ((test_buf[i] ^ data_buf[i]) != 0xff) {
589 err = -EIO;
590 break;
591 }
592 }
593 kfree(data_buf);
594
595 if (cmd.error)
596 return cmd.error;
597 if (data.error)
598 return data.error;
599
600 return err;
601}
602
603int mmc_bus_test(struct mmc_card *card, u8 bus_width)
604{
605 int err, width;
606
607 if (bus_width == MMC_BUS_WIDTH_8)
608 width = 8;
609 else if (bus_width == MMC_BUS_WIDTH_4)
610 width = 4;
611 else if (bus_width == MMC_BUS_WIDTH_1)
612 return 0; /* no need for test */
613 else
614 return -EINVAL;
615
616 /*
617 * Ignore errors from BUS_TEST_W. BUS_TEST_R will fail if there
618 * is a problem. This improves chances that the test will work.
619 */
620 mmc_send_bus_test(card, card->host, MMC_BUS_TEST_W, width);
621 err = mmc_send_bus_test(card, card->host, MMC_BUS_TEST_R, width);
622 return err;
623}
624
625int mmc_send_hpi_cmd(struct mmc_card *card, u32 *status)
626{
627 struct mmc_command cmd = {0};
628 unsigned int opcode;
629 int err;
630
631 if (!card->ext_csd.hpi) {
632 pr_warning("%s: Card didn't support HPI command\n",
633 mmc_hostname(card->host));
634 return -EINVAL;
635 }
636
637 opcode = card->ext_csd.hpi_cmd;
638 if (opcode == MMC_STOP_TRANSMISSION)
639 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
640 else if (opcode == MMC_SEND_STATUS)
641 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
642
643 cmd.opcode = opcode;
644 cmd.arg = card->rca << 16 | 1;
645
646 err = mmc_wait_for_cmd(card->host, &cmd, 0);
647 if (err) {
648 pr_warn("%s: error %d interrupting operation. "
649 "HPI command response %#x\n", mmc_hostname(card->host),
650 err, cmd.resp[0]);
651 return err;
652 }
653 if (status)
654 *status = cmd.resp[0];
655
656 return 0;
657}