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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/types.h>
14#include <linux/scatterlist.h>
15
16#include <linux/mmc/host.h>
17#include <linux/mmc/card.h>
18#include <linux/mmc/mmc.h>
19
20#include "core.h"
21#include "mmc_ops.h"
22
23static int _mmc_select_card(struct mmc_host *host, struct mmc_card *card)
24{
25 int err;
26 struct mmc_command cmd = {0};
27
28 BUG_ON(!host);
29
30 cmd.opcode = MMC_SELECT_CARD;
31
32 if (card) {
33 cmd.arg = card->rca << 16;
34 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
35 } else {
36 cmd.arg = 0;
37 cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
38 }
39
40 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
41 if (err)
42 return err;
43
44 return 0;
45}
46
47int mmc_select_card(struct mmc_card *card)
48{
49 BUG_ON(!card);
50
51 return _mmc_select_card(card->host, card);
52}
53
54int mmc_deselect_cards(struct mmc_host *host)
55{
56 return _mmc_select_card(host, NULL);
57}
58
59int mmc_card_sleepawake(struct mmc_host *host, int sleep)
60{
61 struct mmc_command cmd = {0};
62 struct mmc_card *card = host->card;
63 int err;
64
65 if (sleep)
66 mmc_deselect_cards(host);
67
68 cmd.opcode = MMC_SLEEP_AWAKE;
69 cmd.arg = card->rca << 16;
70 if (sleep)
71 cmd.arg |= 1 << 15;
72
73 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
74 err = mmc_wait_for_cmd(host, &cmd, 0);
75 if (err)
76 return err;
77
78 /*
79 * If the host does not wait while the card signals busy, then we will
80 * will have to wait the sleep/awake timeout. Note, we cannot use the
81 * SEND_STATUS command to poll the status because that command (and most
82 * others) is invalid while the card sleeps.
83 */
84 if (!(host->caps & MMC_CAP_WAIT_WHILE_BUSY))
85 mmc_delay(DIV_ROUND_UP(card->ext_csd.sa_timeout, 10000));
86
87 if (!sleep)
88 err = mmc_select_card(card);
89
90 return err;
91}
92
93int mmc_go_idle(struct mmc_host *host)
94{
95 int err;
96 struct mmc_command cmd = {0};
97
98 /*
99 * Non-SPI hosts need to prevent chipselect going active during
100 * GO_IDLE; that would put chips into SPI mode. Remind them of
101 * that in case of hardware that won't pull up DAT3/nCS otherwise.
102 *
103 * SPI hosts ignore ios.chip_select; it's managed according to
104 * rules that must accommodate non-MMC slaves which this layer
105 * won't even know about.
106 */
107 if (!mmc_host_is_spi(host)) {
108 mmc_set_chip_select(host, MMC_CS_HIGH);
109 mmc_delay(1);
110 }
111
112 cmd.opcode = MMC_GO_IDLE_STATE;
113 cmd.arg = 0;
114 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_NONE | MMC_CMD_BC;
115
116 err = mmc_wait_for_cmd(host, &cmd, 0);
117
118 mmc_delay(1);
119
120 if (!mmc_host_is_spi(host)) {
121 mmc_set_chip_select(host, MMC_CS_DONTCARE);
122 mmc_delay(1);
123 }
124
125 host->use_spi_crc = 0;
126
127 return err;
128}
129
130int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
131{
132 struct mmc_command cmd = {0};
133 int i, err = 0;
134
135 BUG_ON(!host);
136
137 cmd.opcode = MMC_SEND_OP_COND;
138 cmd.arg = mmc_host_is_spi(host) ? 0 : ocr;
139 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
140
141 for (i = 100; i; i--) {
142 err = mmc_wait_for_cmd(host, &cmd, 0);
143 if (err)
144 break;
145
146 /* if we're just probing, do a single pass */
147 if (ocr == 0)
148 break;
149
150 /* otherwise wait until reset completes */
151 if (mmc_host_is_spi(host)) {
152 if (!(cmd.resp[0] & R1_SPI_IDLE))
153 break;
154 } else {
155 if (cmd.resp[0] & MMC_CARD_BUSY)
156 break;
157 }
158
159 err = -ETIMEDOUT;
160
161 mmc_delay(10);
162 }
163
164 if (rocr && !mmc_host_is_spi(host))
165 *rocr = cmd.resp[0];
166
167 return err;
168}
169
170int mmc_all_send_cid(struct mmc_host *host, u32 *cid)
171{
172 int err;
173 struct mmc_command cmd = {0};
174
175 BUG_ON(!host);
176 BUG_ON(!cid);
177
178 cmd.opcode = MMC_ALL_SEND_CID;
179 cmd.arg = 0;
180 cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR;
181
182 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
183 if (err)
184 return err;
185
186 memcpy(cid, cmd.resp, sizeof(u32) * 4);
187
188 return 0;
189}
190
191int mmc_set_relative_addr(struct mmc_card *card)
192{
193 int err;
194 struct mmc_command cmd = {0};
195
196 BUG_ON(!card);
197 BUG_ON(!card->host);
198
199 cmd.opcode = MMC_SET_RELATIVE_ADDR;
200 cmd.arg = card->rca << 16;
201 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
202
203 err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
204 if (err)
205 return err;
206
207 return 0;
208}
209
210static int
211mmc_send_cxd_native(struct mmc_host *host, u32 arg, u32 *cxd, int opcode)
212{
213 int err;
214 struct mmc_command cmd = {0};
215
216 BUG_ON(!host);
217 BUG_ON(!cxd);
218
219 cmd.opcode = opcode;
220 cmd.arg = arg;
221 cmd.flags = MMC_RSP_R2 | MMC_CMD_AC;
222
223 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
224 if (err)
225 return err;
226
227 memcpy(cxd, cmd.resp, sizeof(u32) * 4);
228
229 return 0;
230}
231
232static int
233mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host,
234 u32 opcode, void *buf, unsigned len)
235{
236 struct mmc_request mrq = {0};
237 struct mmc_command cmd = {0};
238 struct mmc_data data = {0};
239 struct scatterlist sg;
240 void *data_buf;
241
242 /* dma onto stack is unsafe/nonportable, but callers to this
243 * routine normally provide temporary on-stack buffers ...
244 */
245 data_buf = kmalloc(len, GFP_KERNEL);
246 if (data_buf == NULL)
247 return -ENOMEM;
248
249 mrq.cmd = &cmd;
250 mrq.data = &data;
251
252 cmd.opcode = opcode;
253 cmd.arg = 0;
254
255 /* NOTE HACK: the MMC_RSP_SPI_R1 is always correct here, but we
256 * rely on callers to never use this with "native" calls for reading
257 * CSD or CID. Native versions of those commands use the R2 type,
258 * not R1 plus a data block.
259 */
260 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
261
262 data.blksz = len;
263 data.blocks = 1;
264 data.flags = MMC_DATA_READ;
265 data.sg = &sg;
266 data.sg_len = 1;
267
268 sg_init_one(&sg, data_buf, len);
269
270 if (opcode == MMC_SEND_CSD || opcode == MMC_SEND_CID) {
271 /*
272 * The spec states that CSR and CID accesses have a timeout
273 * of 64 clock cycles.
274 */
275 data.timeout_ns = 0;
276 data.timeout_clks = 64;
277 } else
278 mmc_set_data_timeout(&data, card);
279
280 mmc_wait_for_req(host, &mrq);
281
282 memcpy(buf, data_buf, len);
283 kfree(data_buf);
284
285 if (cmd.error)
286 return cmd.error;
287 if (data.error)
288 return data.error;
289
290 return 0;
291}
292
293int mmc_send_csd(struct mmc_card *card, u32 *csd)
294{
295 int ret, i;
296
297 if (!mmc_host_is_spi(card->host))
298 return mmc_send_cxd_native(card->host, card->rca << 16,
299 csd, MMC_SEND_CSD);
300
301 ret = mmc_send_cxd_data(card, card->host, MMC_SEND_CSD, csd, 16);
302 if (ret)
303 return ret;
304
305 for (i = 0;i < 4;i++)
306 csd[i] = be32_to_cpu(csd[i]);
307
308 return 0;
309}
310
311int mmc_send_cid(struct mmc_host *host, u32 *cid)
312{
313 int ret, i;
314
315 if (!mmc_host_is_spi(host)) {
316 if (!host->card)
317 return -EINVAL;
318 return mmc_send_cxd_native(host, host->card->rca << 16,
319 cid, MMC_SEND_CID);
320 }
321
322 ret = mmc_send_cxd_data(NULL, host, MMC_SEND_CID, cid, 16);
323 if (ret)
324 return ret;
325
326 for (i = 0;i < 4;i++)
327 cid[i] = be32_to_cpu(cid[i]);
328
329 return 0;
330}
331
332int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd)
333{
334 return mmc_send_cxd_data(card, card->host, MMC_SEND_EXT_CSD,
335 ext_csd, 512);
336}
337
338int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp)
339{
340 struct mmc_command cmd = {0};
341 int err;
342
343 cmd.opcode = MMC_SPI_READ_OCR;
344 cmd.arg = highcap ? (1 << 30) : 0;
345 cmd.flags = MMC_RSP_SPI_R3;
346
347 err = mmc_wait_for_cmd(host, &cmd, 0);
348
349 *ocrp = cmd.resp[1];
350 return err;
351}
352
353int mmc_spi_set_crc(struct mmc_host *host, int use_crc)
354{
355 struct mmc_command cmd = {0};
356 int err;
357
358 cmd.opcode = MMC_SPI_CRC_ON_OFF;
359 cmd.flags = MMC_RSP_SPI_R1;
360 cmd.arg = use_crc;
361
362 err = mmc_wait_for_cmd(host, &cmd, 0);
363 if (!err)
364 host->use_spi_crc = use_crc;
365 return err;
366}
367
368/**
369 * mmc_switch - modify EXT_CSD register
370 * @card: the MMC card associated with the data transfer
371 * @set: cmd set values
372 * @index: EXT_CSD register index
373 * @value: value to program into EXT_CSD register
374 * @timeout_ms: timeout (ms) for operation performed by register write,
375 * timeout of zero implies maximum possible timeout
376 *
377 * Modifies the EXT_CSD register for selected card.
378 */
379int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
380 unsigned int timeout_ms)
381{
382 int err;
383 struct mmc_command cmd = {0};
384 u32 status;
385
386 BUG_ON(!card);
387 BUG_ON(!card->host);
388
389 cmd.opcode = MMC_SWITCH;
390 cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
391 (index << 16) |
392 (value << 8) |
393 set;
394 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
395 cmd.cmd_timeout_ms = timeout_ms;
396
397 err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
398 if (err)
399 return err;
400
401 /* Must check status to be sure of no errors */
402 do {
403 err = mmc_send_status(card, &status);
404 if (err)
405 return err;
406 if (card->host->caps & MMC_CAP_WAIT_WHILE_BUSY)
407 break;
408 if (mmc_host_is_spi(card->host))
409 break;
410 } while (R1_CURRENT_STATE(status) == R1_STATE_PRG);
411
412 if (mmc_host_is_spi(card->host)) {
413 if (status & R1_SPI_ILLEGAL_COMMAND)
414 return -EBADMSG;
415 } else {
416 if (status & 0xFDFFA000)
417 printk(KERN_WARNING "%s: unexpected status %#x after "
418 "switch", mmc_hostname(card->host), status);
419 if (status & R1_SWITCH_ERROR)
420 return -EBADMSG;
421 }
422
423 return 0;
424}
425EXPORT_SYMBOL_GPL(mmc_switch);
426
427int mmc_send_status(struct mmc_card *card, u32 *status)
428{
429 int err;
430 struct mmc_command cmd = {0};
431
432 BUG_ON(!card);
433 BUG_ON(!card->host);
434
435 cmd.opcode = MMC_SEND_STATUS;
436 if (!mmc_host_is_spi(card->host))
437 cmd.arg = card->rca << 16;
438 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
439
440 err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
441 if (err)
442 return err;
443
444 /* NOTE: callers are required to understand the difference
445 * between "native" and SPI format status words!
446 */
447 if (status)
448 *status = cmd.resp[0];
449
450 return 0;
451}
452
453static int
454mmc_send_bus_test(struct mmc_card *card, struct mmc_host *host, u8 opcode,
455 u8 len)
456{
457 struct mmc_request mrq = {0};
458 struct mmc_command cmd = {0};
459 struct mmc_data data = {0};
460 struct scatterlist sg;
461 u8 *data_buf;
462 u8 *test_buf;
463 int i, err;
464 static u8 testdata_8bit[8] = { 0x55, 0xaa, 0, 0, 0, 0, 0, 0 };
465 static u8 testdata_4bit[4] = { 0x5a, 0, 0, 0 };
466
467 /* dma onto stack is unsafe/nonportable, but callers to this
468 * routine normally provide temporary on-stack buffers ...
469 */
470 data_buf = kmalloc(len, GFP_KERNEL);
471 if (!data_buf)
472 return -ENOMEM;
473
474 if (len == 8)
475 test_buf = testdata_8bit;
476 else if (len == 4)
477 test_buf = testdata_4bit;
478 else {
479 printk(KERN_ERR "%s: Invalid bus_width %d\n",
480 mmc_hostname(host), len);
481 kfree(data_buf);
482 return -EINVAL;
483 }
484
485 if (opcode == MMC_BUS_TEST_W)
486 memcpy(data_buf, test_buf, len);
487
488 mrq.cmd = &cmd;
489 mrq.data = &data;
490 cmd.opcode = opcode;
491 cmd.arg = 0;
492
493 /* NOTE HACK: the MMC_RSP_SPI_R1 is always correct here, but we
494 * rely on callers to never use this with "native" calls for reading
495 * CSD or CID. Native versions of those commands use the R2 type,
496 * not R1 plus a data block.
497 */
498 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
499
500 data.blksz = len;
501 data.blocks = 1;
502 if (opcode == MMC_BUS_TEST_R)
503 data.flags = MMC_DATA_READ;
504 else
505 data.flags = MMC_DATA_WRITE;
506
507 data.sg = &sg;
508 data.sg_len = 1;
509 sg_init_one(&sg, data_buf, len);
510 mmc_wait_for_req(host, &mrq);
511 err = 0;
512 if (opcode == MMC_BUS_TEST_R) {
513 for (i = 0; i < len / 4; i++)
514 if ((test_buf[i] ^ data_buf[i]) != 0xff) {
515 err = -EIO;
516 break;
517 }
518 }
519 kfree(data_buf);
520
521 if (cmd.error)
522 return cmd.error;
523 if (data.error)
524 return data.error;
525
526 return err;
527}
528
529int mmc_bus_test(struct mmc_card *card, u8 bus_width)
530{
531 int err, width;
532
533 if (bus_width == MMC_BUS_WIDTH_8)
534 width = 8;
535 else if (bus_width == MMC_BUS_WIDTH_4)
536 width = 4;
537 else if (bus_width == MMC_BUS_WIDTH_1)
538 return 0; /* no need for test */
539 else
540 return -EINVAL;
541
542 /*
543 * Ignore errors from BUS_TEST_W. BUS_TEST_R will fail if there
544 * is a problem. This improves chances that the test will work.
545 */
546 mmc_send_bus_test(card, card->host, MMC_BUS_TEST_W, width);
547 err = mmc_send_bus_test(card, card->host, MMC_BUS_TEST_R, width);
548 return err;
549}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * linux/drivers/mmc/core/mmc_ops.h
4 *
5 * Copyright 2006-2007 Pierre Ossman
6 */
7
8#include <linux/slab.h>
9#include <linux/export.h>
10#include <linux/types.h>
11#include <linux/scatterlist.h>
12
13#include <linux/mmc/host.h>
14#include <linux/mmc/card.h>
15#include <linux/mmc/mmc.h>
16
17#include "core.h"
18#include "card.h"
19#include "host.h"
20#include "mmc_ops.h"
21
22#define MMC_OPS_TIMEOUT_MS (10 * 60 * 1000) /* 10 minute timeout */
23
24static const u8 tuning_blk_pattern_4bit[] = {
25 0xff, 0x0f, 0xff, 0x00, 0xff, 0xcc, 0xc3, 0xcc,
26 0xc3, 0x3c, 0xcc, 0xff, 0xfe, 0xff, 0xfe, 0xef,
27 0xff, 0xdf, 0xff, 0xdd, 0xff, 0xfb, 0xff, 0xfb,
28 0xbf, 0xff, 0x7f, 0xff, 0x77, 0xf7, 0xbd, 0xef,
29 0xff, 0xf0, 0xff, 0xf0, 0x0f, 0xfc, 0xcc, 0x3c,
30 0xcc, 0x33, 0xcc, 0xcf, 0xff, 0xef, 0xff, 0xee,
31 0xff, 0xfd, 0xff, 0xfd, 0xdf, 0xff, 0xbf, 0xff,
32 0xbb, 0xff, 0xf7, 0xff, 0xf7, 0x7f, 0x7b, 0xde,
33};
34
35static const u8 tuning_blk_pattern_8bit[] = {
36 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00,
37 0xff, 0xff, 0xcc, 0xcc, 0xcc, 0x33, 0xcc, 0xcc,
38 0xcc, 0x33, 0x33, 0xcc, 0xcc, 0xcc, 0xff, 0xff,
39 0xff, 0xee, 0xff, 0xff, 0xff, 0xee, 0xee, 0xff,
40 0xff, 0xff, 0xdd, 0xff, 0xff, 0xff, 0xdd, 0xdd,
41 0xff, 0xff, 0xff, 0xbb, 0xff, 0xff, 0xff, 0xbb,
42 0xbb, 0xff, 0xff, 0xff, 0x77, 0xff, 0xff, 0xff,
43 0x77, 0x77, 0xff, 0x77, 0xbb, 0xdd, 0xee, 0xff,
44 0xff, 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0x00,
45 0x00, 0xff, 0xff, 0xcc, 0xcc, 0xcc, 0x33, 0xcc,
46 0xcc, 0xcc, 0x33, 0x33, 0xcc, 0xcc, 0xcc, 0xff,
47 0xff, 0xff, 0xee, 0xff, 0xff, 0xff, 0xee, 0xee,
48 0xff, 0xff, 0xff, 0xdd, 0xff, 0xff, 0xff, 0xdd,
49 0xdd, 0xff, 0xff, 0xff, 0xbb, 0xff, 0xff, 0xff,
50 0xbb, 0xbb, 0xff, 0xff, 0xff, 0x77, 0xff, 0xff,
51 0xff, 0x77, 0x77, 0xff, 0x77, 0xbb, 0xdd, 0xee,
52};
53
54int __mmc_send_status(struct mmc_card *card, u32 *status, unsigned int retries)
55{
56 int err;
57 struct mmc_command cmd = {};
58
59 cmd.opcode = MMC_SEND_STATUS;
60 if (!mmc_host_is_spi(card->host))
61 cmd.arg = card->rca << 16;
62 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
63
64 err = mmc_wait_for_cmd(card->host, &cmd, retries);
65 if (err)
66 return err;
67
68 /* NOTE: callers are required to understand the difference
69 * between "native" and SPI format status words!
70 */
71 if (status)
72 *status = cmd.resp[0];
73
74 return 0;
75}
76EXPORT_SYMBOL_GPL(__mmc_send_status);
77
78int mmc_send_status(struct mmc_card *card, u32 *status)
79{
80 return __mmc_send_status(card, status, MMC_CMD_RETRIES);
81}
82EXPORT_SYMBOL_GPL(mmc_send_status);
83
84static int _mmc_select_card(struct mmc_host *host, struct mmc_card *card)
85{
86 struct mmc_command cmd = {};
87
88 cmd.opcode = MMC_SELECT_CARD;
89
90 if (card) {
91 cmd.arg = card->rca << 16;
92 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
93 } else {
94 cmd.arg = 0;
95 cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
96 }
97
98 return mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
99}
100
101int mmc_select_card(struct mmc_card *card)
102{
103
104 return _mmc_select_card(card->host, card);
105}
106
107int mmc_deselect_cards(struct mmc_host *host)
108{
109 return _mmc_select_card(host, NULL);
110}
111
112/*
113 * Write the value specified in the device tree or board code into the optional
114 * 16 bit Driver Stage Register. This can be used to tune raise/fall times and
115 * drive strength of the DAT and CMD outputs. The actual meaning of a given
116 * value is hardware dependant.
117 * The presence of the DSR register can be determined from the CSD register,
118 * bit 76.
119 */
120int mmc_set_dsr(struct mmc_host *host)
121{
122 struct mmc_command cmd = {};
123
124 cmd.opcode = MMC_SET_DSR;
125
126 cmd.arg = (host->dsr << 16) | 0xffff;
127 cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
128
129 return mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
130}
131
132int mmc_go_idle(struct mmc_host *host)
133{
134 int err;
135 struct mmc_command cmd = {};
136
137 /*
138 * Non-SPI hosts need to prevent chipselect going active during
139 * GO_IDLE; that would put chips into SPI mode. Remind them of
140 * that in case of hardware that won't pull up DAT3/nCS otherwise.
141 *
142 * SPI hosts ignore ios.chip_select; it's managed according to
143 * rules that must accommodate non-MMC slaves which this layer
144 * won't even know about.
145 */
146 if (!mmc_host_is_spi(host)) {
147 mmc_set_chip_select(host, MMC_CS_HIGH);
148 mmc_delay(1);
149 }
150
151 cmd.opcode = MMC_GO_IDLE_STATE;
152 cmd.arg = 0;
153 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_NONE | MMC_CMD_BC;
154
155 err = mmc_wait_for_cmd(host, &cmd, 0);
156
157 mmc_delay(1);
158
159 if (!mmc_host_is_spi(host)) {
160 mmc_set_chip_select(host, MMC_CS_DONTCARE);
161 mmc_delay(1);
162 }
163
164 host->use_spi_crc = 0;
165
166 return err;
167}
168
169int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
170{
171 struct mmc_command cmd = {};
172 int i, err = 0;
173
174 cmd.opcode = MMC_SEND_OP_COND;
175 cmd.arg = mmc_host_is_spi(host) ? 0 : ocr;
176 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
177
178 for (i = 100; i; i--) {
179 err = mmc_wait_for_cmd(host, &cmd, 0);
180 if (err)
181 break;
182
183 /* 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 * According to eMMC specification v5.1 section 6.4.3, we
198 * should issue CMD1 repeatedly in the idle state until
199 * the eMMC is ready. Otherwise some eMMC devices seem to enter
200 * the inactive mode after mmc_init_card() issued CMD0 when
201 * the eMMC device is busy.
202 */
203 if (!ocr && !mmc_host_is_spi(host))
204 cmd.arg = cmd.resp[0] | BIT(30);
205 }
206
207 if (rocr && !mmc_host_is_spi(host))
208 *rocr = cmd.resp[0];
209
210 return err;
211}
212
213int mmc_set_relative_addr(struct mmc_card *card)
214{
215 struct mmc_command cmd = {};
216
217 cmd.opcode = MMC_SET_RELATIVE_ADDR;
218 cmd.arg = card->rca << 16;
219 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
220
221 return mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
222}
223
224static int
225mmc_send_cxd_native(struct mmc_host *host, u32 arg, u32 *cxd, int opcode)
226{
227 int err;
228 struct mmc_command cmd = {};
229
230 cmd.opcode = opcode;
231 cmd.arg = arg;
232 cmd.flags = MMC_RSP_R2 | MMC_CMD_AC;
233
234 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
235 if (err)
236 return err;
237
238 memcpy(cxd, cmd.resp, sizeof(u32) * 4);
239
240 return 0;
241}
242
243/*
244 * NOTE: void *buf, caller for the buf is required to use DMA-capable
245 * buffer or on-stack buffer (with some overhead in callee).
246 */
247static int
248mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host,
249 u32 opcode, void *buf, unsigned len)
250{
251 struct mmc_request mrq = {};
252 struct mmc_command cmd = {};
253 struct mmc_data data = {};
254 struct scatterlist sg;
255
256 mrq.cmd = &cmd;
257 mrq.data = &data;
258
259 cmd.opcode = opcode;
260 cmd.arg = 0;
261
262 /* NOTE HACK: the MMC_RSP_SPI_R1 is always correct here, but we
263 * rely on callers to never use this with "native" calls for reading
264 * CSD or CID. Native versions of those commands use the R2 type,
265 * not R1 plus a data block.
266 */
267 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
268
269 data.blksz = len;
270 data.blocks = 1;
271 data.flags = MMC_DATA_READ;
272 data.sg = &sg;
273 data.sg_len = 1;
274
275 sg_init_one(&sg, buf, len);
276
277 if (opcode == MMC_SEND_CSD || opcode == MMC_SEND_CID) {
278 /*
279 * The spec states that CSR and CID accesses have a timeout
280 * of 64 clock cycles.
281 */
282 data.timeout_ns = 0;
283 data.timeout_clks = 64;
284 } else
285 mmc_set_data_timeout(&data, card);
286
287 mmc_wait_for_req(host, &mrq);
288
289 if (cmd.error)
290 return cmd.error;
291 if (data.error)
292 return data.error;
293
294 return 0;
295}
296
297static int mmc_spi_send_csd(struct mmc_card *card, u32 *csd)
298{
299 int ret, i;
300 __be32 *csd_tmp;
301
302 csd_tmp = kzalloc(16, GFP_KERNEL);
303 if (!csd_tmp)
304 return -ENOMEM;
305
306 ret = mmc_send_cxd_data(card, card->host, MMC_SEND_CSD, csd_tmp, 16);
307 if (ret)
308 goto err;
309
310 for (i = 0; i < 4; i++)
311 csd[i] = be32_to_cpu(csd_tmp[i]);
312
313err:
314 kfree(csd_tmp);
315 return ret;
316}
317
318int mmc_send_csd(struct mmc_card *card, u32 *csd)
319{
320 if (mmc_host_is_spi(card->host))
321 return mmc_spi_send_csd(card, csd);
322
323 return mmc_send_cxd_native(card->host, card->rca << 16, csd,
324 MMC_SEND_CSD);
325}
326
327static int mmc_spi_send_cid(struct mmc_host *host, u32 *cid)
328{
329 int ret, i;
330 __be32 *cid_tmp;
331
332 cid_tmp = kzalloc(16, GFP_KERNEL);
333 if (!cid_tmp)
334 return -ENOMEM;
335
336 ret = mmc_send_cxd_data(NULL, host, MMC_SEND_CID, cid_tmp, 16);
337 if (ret)
338 goto err;
339
340 for (i = 0; i < 4; i++)
341 cid[i] = be32_to_cpu(cid_tmp[i]);
342
343err:
344 kfree(cid_tmp);
345 return ret;
346}
347
348int mmc_send_cid(struct mmc_host *host, u32 *cid)
349{
350 if (mmc_host_is_spi(host))
351 return mmc_spi_send_cid(host, cid);
352
353 return mmc_send_cxd_native(host, 0, cid, MMC_ALL_SEND_CID);
354}
355
356int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd)
357{
358 int err;
359 u8 *ext_csd;
360
361 if (!card || !new_ext_csd)
362 return -EINVAL;
363
364 if (!mmc_can_ext_csd(card))
365 return -EOPNOTSUPP;
366
367 /*
368 * As the ext_csd is so large and mostly unused, we don't store the
369 * raw block in mmc_card.
370 */
371 ext_csd = kzalloc(512, GFP_KERNEL);
372 if (!ext_csd)
373 return -ENOMEM;
374
375 err = mmc_send_cxd_data(card, card->host, MMC_SEND_EXT_CSD, ext_csd,
376 512);
377 if (err)
378 kfree(ext_csd);
379 else
380 *new_ext_csd = ext_csd;
381
382 return err;
383}
384EXPORT_SYMBOL_GPL(mmc_get_ext_csd);
385
386int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp)
387{
388 struct mmc_command cmd = {};
389 int err;
390
391 cmd.opcode = MMC_SPI_READ_OCR;
392 cmd.arg = highcap ? (1 << 30) : 0;
393 cmd.flags = MMC_RSP_SPI_R3;
394
395 err = mmc_wait_for_cmd(host, &cmd, 0);
396
397 *ocrp = cmd.resp[1];
398 return err;
399}
400
401int mmc_spi_set_crc(struct mmc_host *host, int use_crc)
402{
403 struct mmc_command cmd = {};
404 int err;
405
406 cmd.opcode = MMC_SPI_CRC_ON_OFF;
407 cmd.flags = MMC_RSP_SPI_R1;
408 cmd.arg = use_crc;
409
410 err = mmc_wait_for_cmd(host, &cmd, 0);
411 if (!err)
412 host->use_spi_crc = use_crc;
413 return err;
414}
415
416static int mmc_switch_status_error(struct mmc_host *host, u32 status)
417{
418 if (mmc_host_is_spi(host)) {
419 if (status & R1_SPI_ILLEGAL_COMMAND)
420 return -EBADMSG;
421 } else {
422 if (R1_STATUS(status))
423 pr_warn("%s: unexpected status %#x after switch\n",
424 mmc_hostname(host), status);
425 if (status & R1_SWITCH_ERROR)
426 return -EBADMSG;
427 }
428 return 0;
429}
430
431/* Caller must hold re-tuning */
432int __mmc_switch_status(struct mmc_card *card, bool crc_err_fatal)
433{
434 u32 status;
435 int err;
436
437 err = mmc_send_status(card, &status);
438 if (!crc_err_fatal && err == -EILSEQ)
439 return 0;
440 if (err)
441 return err;
442
443 return mmc_switch_status_error(card->host, status);
444}
445
446int mmc_switch_status(struct mmc_card *card)
447{
448 return __mmc_switch_status(card, true);
449}
450
451static int mmc_poll_for_busy(struct mmc_card *card, unsigned int timeout_ms,
452 bool send_status, bool retry_crc_err)
453{
454 struct mmc_host *host = card->host;
455 int err;
456 unsigned long timeout;
457 u32 status = 0;
458 bool expired = false;
459 bool busy = false;
460
461 /* We have an unspecified cmd timeout, use the fallback value. */
462 if (!timeout_ms)
463 timeout_ms = MMC_OPS_TIMEOUT_MS;
464
465 /*
466 * In cases when not allowed to poll by using CMD13 or because we aren't
467 * capable of polling by using ->card_busy(), then rely on waiting the
468 * stated timeout to be sufficient.
469 */
470 if (!send_status && !host->ops->card_busy) {
471 mmc_delay(timeout_ms);
472 return 0;
473 }
474
475 timeout = jiffies + msecs_to_jiffies(timeout_ms) + 1;
476 do {
477 /*
478 * Due to the possibility of being preempted while polling,
479 * check the expiration time first.
480 */
481 expired = time_after(jiffies, timeout);
482
483 if (host->ops->card_busy) {
484 busy = host->ops->card_busy(host);
485 } else {
486 err = mmc_send_status(card, &status);
487 if (retry_crc_err && err == -EILSEQ) {
488 busy = true;
489 } else if (err) {
490 return err;
491 } else {
492 err = mmc_switch_status_error(host, status);
493 if (err)
494 return err;
495 busy = R1_CURRENT_STATE(status) == R1_STATE_PRG;
496 }
497 }
498
499 /* Timeout if the device still remains busy. */
500 if (expired && busy) {
501 pr_err("%s: Card stuck being busy! %s\n",
502 mmc_hostname(host), __func__);
503 return -ETIMEDOUT;
504 }
505 } while (busy);
506
507 return 0;
508}
509
510/**
511 * __mmc_switch - modify EXT_CSD register
512 * @card: the MMC card associated with the data transfer
513 * @set: cmd set values
514 * @index: EXT_CSD register index
515 * @value: value to program into EXT_CSD register
516 * @timeout_ms: timeout (ms) for operation performed by register write,
517 * timeout of zero implies maximum possible timeout
518 * @timing: new timing to change to
519 * @use_busy_signal: use the busy signal as response type
520 * @send_status: send status cmd to poll for busy
521 * @retry_crc_err: retry when CRC errors when polling with CMD13 for busy
522 *
523 * Modifies the EXT_CSD register for selected card.
524 */
525int __mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
526 unsigned int timeout_ms, unsigned char timing,
527 bool use_busy_signal, bool send_status, bool retry_crc_err)
528{
529 struct mmc_host *host = card->host;
530 int err;
531 struct mmc_command cmd = {};
532 bool use_r1b_resp = use_busy_signal;
533 unsigned char old_timing = host->ios.timing;
534
535 mmc_retune_hold(host);
536
537 /*
538 * If the cmd timeout and the max_busy_timeout of the host are both
539 * specified, let's validate them. A failure means we need to prevent
540 * the host from doing hw busy detection, which is done by converting
541 * to a R1 response instead of a R1B.
542 */
543 if (timeout_ms && host->max_busy_timeout &&
544 (timeout_ms > host->max_busy_timeout))
545 use_r1b_resp = false;
546
547 cmd.opcode = MMC_SWITCH;
548 cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
549 (index << 16) |
550 (value << 8) |
551 set;
552 cmd.flags = MMC_CMD_AC;
553 if (use_r1b_resp) {
554 cmd.flags |= MMC_RSP_SPI_R1B | MMC_RSP_R1B;
555 /*
556 * A busy_timeout of zero means the host can decide to use
557 * whatever value it finds suitable.
558 */
559 cmd.busy_timeout = timeout_ms;
560 } else {
561 cmd.flags |= MMC_RSP_SPI_R1 | MMC_RSP_R1;
562 }
563
564 if (index == EXT_CSD_SANITIZE_START)
565 cmd.sanitize_busy = true;
566
567 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
568 if (err)
569 goto out;
570
571 /* No need to check card status in case of unblocking command */
572 if (!use_busy_signal)
573 goto out;
574
575 /*If SPI or used HW busy detection above, then we don't need to poll. */
576 if (((host->caps & MMC_CAP_WAIT_WHILE_BUSY) && use_r1b_resp) ||
577 mmc_host_is_spi(host))
578 goto out_tim;
579
580 /* Let's try to poll to find out when the command is completed. */
581 err = mmc_poll_for_busy(card, timeout_ms, send_status, retry_crc_err);
582 if (err)
583 goto out;
584
585out_tim:
586 /* Switch to new timing before check switch status. */
587 if (timing)
588 mmc_set_timing(host, timing);
589
590 if (send_status) {
591 err = mmc_switch_status(card);
592 if (err && timing)
593 mmc_set_timing(host, old_timing);
594 }
595out:
596 mmc_retune_release(host);
597
598 return err;
599}
600
601int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
602 unsigned int timeout_ms)
603{
604 return __mmc_switch(card, set, index, value, timeout_ms, 0,
605 true, true, false);
606}
607EXPORT_SYMBOL_GPL(mmc_switch);
608
609int mmc_send_tuning(struct mmc_host *host, u32 opcode, int *cmd_error)
610{
611 struct mmc_request mrq = {};
612 struct mmc_command cmd = {};
613 struct mmc_data data = {};
614 struct scatterlist sg;
615 struct mmc_ios *ios = &host->ios;
616 const u8 *tuning_block_pattern;
617 int size, err = 0;
618 u8 *data_buf;
619
620 if (ios->bus_width == MMC_BUS_WIDTH_8) {
621 tuning_block_pattern = tuning_blk_pattern_8bit;
622 size = sizeof(tuning_blk_pattern_8bit);
623 } else if (ios->bus_width == MMC_BUS_WIDTH_4) {
624 tuning_block_pattern = tuning_blk_pattern_4bit;
625 size = sizeof(tuning_blk_pattern_4bit);
626 } else
627 return -EINVAL;
628
629 data_buf = kzalloc(size, GFP_KERNEL);
630 if (!data_buf)
631 return -ENOMEM;
632
633 mrq.cmd = &cmd;
634 mrq.data = &data;
635
636 cmd.opcode = opcode;
637 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
638
639 data.blksz = size;
640 data.blocks = 1;
641 data.flags = MMC_DATA_READ;
642
643 /*
644 * According to the tuning specs, Tuning process
645 * is normally shorter 40 executions of CMD19,
646 * and timeout value should be shorter than 150 ms
647 */
648 data.timeout_ns = 150 * NSEC_PER_MSEC;
649
650 data.sg = &sg;
651 data.sg_len = 1;
652 sg_init_one(&sg, data_buf, size);
653
654 mmc_wait_for_req(host, &mrq);
655
656 if (cmd_error)
657 *cmd_error = cmd.error;
658
659 if (cmd.error) {
660 err = cmd.error;
661 goto out;
662 }
663
664 if (data.error) {
665 err = data.error;
666 goto out;
667 }
668
669 if (memcmp(data_buf, tuning_block_pattern, size))
670 err = -EIO;
671
672out:
673 kfree(data_buf);
674 return err;
675}
676EXPORT_SYMBOL_GPL(mmc_send_tuning);
677
678int mmc_abort_tuning(struct mmc_host *host, u32 opcode)
679{
680 struct mmc_command cmd = {};
681
682 /*
683 * eMMC specification specifies that CMD12 can be used to stop a tuning
684 * command, but SD specification does not, so do nothing unless it is
685 * eMMC.
686 */
687 if (opcode != MMC_SEND_TUNING_BLOCK_HS200)
688 return 0;
689
690 cmd.opcode = MMC_STOP_TRANSMISSION;
691 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
692
693 /*
694 * For drivers that override R1 to R1b, set an arbitrary timeout based
695 * on the tuning timeout i.e. 150ms.
696 */
697 cmd.busy_timeout = 150;
698
699 return mmc_wait_for_cmd(host, &cmd, 0);
700}
701EXPORT_SYMBOL_GPL(mmc_abort_tuning);
702
703static int
704mmc_send_bus_test(struct mmc_card *card, struct mmc_host *host, u8 opcode,
705 u8 len)
706{
707 struct mmc_request mrq = {};
708 struct mmc_command cmd = {};
709 struct mmc_data data = {};
710 struct scatterlist sg;
711 u8 *data_buf;
712 u8 *test_buf;
713 int i, err;
714 static u8 testdata_8bit[8] = { 0x55, 0xaa, 0, 0, 0, 0, 0, 0 };
715 static u8 testdata_4bit[4] = { 0x5a, 0, 0, 0 };
716
717 /* dma onto stack is unsafe/nonportable, but callers to this
718 * routine normally provide temporary on-stack buffers ...
719 */
720 data_buf = kmalloc(len, GFP_KERNEL);
721 if (!data_buf)
722 return -ENOMEM;
723
724 if (len == 8)
725 test_buf = testdata_8bit;
726 else if (len == 4)
727 test_buf = testdata_4bit;
728 else {
729 pr_err("%s: Invalid bus_width %d\n",
730 mmc_hostname(host), len);
731 kfree(data_buf);
732 return -EINVAL;
733 }
734
735 if (opcode == MMC_BUS_TEST_W)
736 memcpy(data_buf, test_buf, len);
737
738 mrq.cmd = &cmd;
739 mrq.data = &data;
740 cmd.opcode = opcode;
741 cmd.arg = 0;
742
743 /* NOTE HACK: the MMC_RSP_SPI_R1 is always correct here, but we
744 * rely on callers to never use this with "native" calls for reading
745 * CSD or CID. Native versions of those commands use the R2 type,
746 * not R1 plus a data block.
747 */
748 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
749
750 data.blksz = len;
751 data.blocks = 1;
752 if (opcode == MMC_BUS_TEST_R)
753 data.flags = MMC_DATA_READ;
754 else
755 data.flags = MMC_DATA_WRITE;
756
757 data.sg = &sg;
758 data.sg_len = 1;
759 mmc_set_data_timeout(&data, card);
760 sg_init_one(&sg, data_buf, len);
761 mmc_wait_for_req(host, &mrq);
762 err = 0;
763 if (opcode == MMC_BUS_TEST_R) {
764 for (i = 0; i < len / 4; i++)
765 if ((test_buf[i] ^ data_buf[i]) != 0xff) {
766 err = -EIO;
767 break;
768 }
769 }
770 kfree(data_buf);
771
772 if (cmd.error)
773 return cmd.error;
774 if (data.error)
775 return data.error;
776
777 return err;
778}
779
780int mmc_bus_test(struct mmc_card *card, u8 bus_width)
781{
782 int width;
783
784 if (bus_width == MMC_BUS_WIDTH_8)
785 width = 8;
786 else if (bus_width == MMC_BUS_WIDTH_4)
787 width = 4;
788 else if (bus_width == MMC_BUS_WIDTH_1)
789 return 0; /* no need for test */
790 else
791 return -EINVAL;
792
793 /*
794 * Ignore errors from BUS_TEST_W. BUS_TEST_R will fail if there
795 * is a problem. This improves chances that the test will work.
796 */
797 mmc_send_bus_test(card, card->host, MMC_BUS_TEST_W, width);
798 return mmc_send_bus_test(card, card->host, MMC_BUS_TEST_R, width);
799}
800
801static int mmc_send_hpi_cmd(struct mmc_card *card, u32 *status)
802{
803 struct mmc_command cmd = {};
804 unsigned int opcode;
805 int err;
806
807 opcode = card->ext_csd.hpi_cmd;
808 if (opcode == MMC_STOP_TRANSMISSION)
809 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
810 else if (opcode == MMC_SEND_STATUS)
811 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
812
813 cmd.opcode = opcode;
814 cmd.arg = card->rca << 16 | 1;
815
816 err = mmc_wait_for_cmd(card->host, &cmd, 0);
817 if (err) {
818 pr_warn("%s: error %d interrupting operation. "
819 "HPI command response %#x\n", mmc_hostname(card->host),
820 err, cmd.resp[0]);
821 return err;
822 }
823 if (status)
824 *status = cmd.resp[0];
825
826 return 0;
827}
828
829/**
830 * mmc_interrupt_hpi - Issue for High priority Interrupt
831 * @card: the MMC card associated with the HPI transfer
832 *
833 * Issued High Priority Interrupt, and check for card status
834 * until out-of prg-state.
835 */
836int mmc_interrupt_hpi(struct mmc_card *card)
837{
838 int err;
839 u32 status;
840 unsigned long prg_wait;
841
842 if (!card->ext_csd.hpi_en) {
843 pr_info("%s: HPI enable bit unset\n", mmc_hostname(card->host));
844 return 1;
845 }
846
847 err = mmc_send_status(card, &status);
848 if (err) {
849 pr_err("%s: Get card status fail\n", mmc_hostname(card->host));
850 goto out;
851 }
852
853 switch (R1_CURRENT_STATE(status)) {
854 case R1_STATE_IDLE:
855 case R1_STATE_READY:
856 case R1_STATE_STBY:
857 case R1_STATE_TRAN:
858 /*
859 * In idle and transfer states, HPI is not needed and the caller
860 * can issue the next intended command immediately
861 */
862 goto out;
863 case R1_STATE_PRG:
864 break;
865 default:
866 /* In all other states, it's illegal to issue HPI */
867 pr_debug("%s: HPI cannot be sent. Card state=%d\n",
868 mmc_hostname(card->host), R1_CURRENT_STATE(status));
869 err = -EINVAL;
870 goto out;
871 }
872
873 err = mmc_send_hpi_cmd(card, &status);
874 if (err)
875 goto out;
876
877 prg_wait = jiffies + msecs_to_jiffies(card->ext_csd.out_of_int_time);
878 do {
879 err = mmc_send_status(card, &status);
880
881 if (!err && R1_CURRENT_STATE(status) == R1_STATE_TRAN)
882 break;
883 if (time_after(jiffies, prg_wait))
884 err = -ETIMEDOUT;
885 } while (!err);
886
887out:
888 return err;
889}
890
891int mmc_can_ext_csd(struct mmc_card *card)
892{
893 return (card && card->csd.mmca_vsn > CSD_SPEC_VER_3);
894}
895
896static int mmc_read_bkops_status(struct mmc_card *card)
897{
898 int err;
899 u8 *ext_csd;
900
901 err = mmc_get_ext_csd(card, &ext_csd);
902 if (err)
903 return err;
904
905 card->ext_csd.raw_bkops_status = ext_csd[EXT_CSD_BKOPS_STATUS];
906 card->ext_csd.raw_exception_status = ext_csd[EXT_CSD_EXP_EVENTS_STATUS];
907 kfree(ext_csd);
908 return 0;
909}
910
911/**
912 * mmc_run_bkops - Run BKOPS for supported cards
913 * @card: MMC card to run BKOPS for
914 *
915 * Run background operations synchronously for cards having manual BKOPS
916 * enabled and in case it reports urgent BKOPS level.
917*/
918void mmc_run_bkops(struct mmc_card *card)
919{
920 int err;
921
922 if (!card->ext_csd.man_bkops_en)
923 return;
924
925 err = mmc_read_bkops_status(card);
926 if (err) {
927 pr_err("%s: Failed to read bkops status: %d\n",
928 mmc_hostname(card->host), err);
929 return;
930 }
931
932 if (!card->ext_csd.raw_bkops_status ||
933 card->ext_csd.raw_bkops_status < EXT_CSD_BKOPS_LEVEL_2)
934 return;
935
936 mmc_retune_hold(card->host);
937
938 /*
939 * For urgent BKOPS status, LEVEL_2 and higher, let's execute
940 * synchronously. Future wise, we may consider to start BKOPS, for less
941 * urgent levels by using an asynchronous background task, when idle.
942 */
943 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
944 EXT_CSD_BKOPS_START, 1, MMC_OPS_TIMEOUT_MS);
945 if (err)
946 pr_warn("%s: Error %d starting bkops\n",
947 mmc_hostname(card->host), err);
948
949 mmc_retune_release(card->host);
950}
951EXPORT_SYMBOL(mmc_run_bkops);
952
953/*
954 * Flush the cache to the non-volatile storage.
955 */
956int mmc_flush_cache(struct mmc_card *card)
957{
958 int err = 0;
959
960 if (mmc_card_mmc(card) &&
961 (card->ext_csd.cache_size > 0) &&
962 (card->ext_csd.cache_ctrl & 1)) {
963 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
964 EXT_CSD_FLUSH_CACHE, 1, 0);
965 if (err)
966 pr_err("%s: cache flush error %d\n",
967 mmc_hostname(card->host), err);
968 }
969
970 return err;
971}
972EXPORT_SYMBOL(mmc_flush_cache);
973
974static int mmc_cmdq_switch(struct mmc_card *card, bool enable)
975{
976 u8 val = enable ? EXT_CSD_CMDQ_MODE_ENABLED : 0;
977 int err;
978
979 if (!card->ext_csd.cmdq_support)
980 return -EOPNOTSUPP;
981
982 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_CMDQ_MODE_EN,
983 val, card->ext_csd.generic_cmd6_time);
984 if (!err)
985 card->ext_csd.cmdq_en = enable;
986
987 return err;
988}
989
990int mmc_cmdq_enable(struct mmc_card *card)
991{
992 return mmc_cmdq_switch(card, true);
993}
994EXPORT_SYMBOL_GPL(mmc_cmdq_enable);
995
996int mmc_cmdq_disable(struct mmc_card *card)
997{
998 return mmc_cmdq_switch(card, false);
999}
1000EXPORT_SYMBOL_GPL(mmc_cmdq_disable);