2 * linux/drivers/mmc/core/mmc_ops.h
4 * Copyright 2006-2007 Pierre Ossman
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.
12 #include <linux/slab.h>
13 #include <linux/types.h>
14 #include <linux/scatterlist.h>
16 #include <linux/mmc/host.h>
17 #include <linux/mmc/card.h>
18 #include <linux/mmc/mmc.h>
23 static int _mmc_select_card(struct mmc_host *host, struct mmc_card *card)
26 struct mmc_command cmd = {0};
30 cmd.opcode = MMC_SELECT_CARD;
33 cmd.arg = card->rca << 16;
34 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
37 cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
40 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
47 int mmc_select_card(struct mmc_card *card)
51 return _mmc_select_card(card->host, card);
54 int mmc_deselect_cards(struct mmc_host *host)
56 return _mmc_select_card(host, NULL);
59 int mmc_card_sleepawake(struct mmc_host *host, int sleep)
61 struct mmc_command cmd = {0};
62 struct mmc_card *card = host->card;
66 mmc_deselect_cards(host);
68 cmd.opcode = MMC_SLEEP_AWAKE;
69 cmd.arg = card->rca << 16;
73 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
74 err = mmc_wait_for_cmd(host, &cmd, 0);
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.
84 if (!(host->caps & MMC_CAP_WAIT_WHILE_BUSY))
85 mmc_delay(DIV_ROUND_UP(card->ext_csd.sa_timeout, 10000));
88 err = mmc_select_card(card);
93 int mmc_go_idle(struct mmc_host *host)
96 struct mmc_command cmd = {0};
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.
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.
107 if (!mmc_host_is_spi(host)) {
108 mmc_set_chip_select(host, MMC_CS_HIGH);
112 cmd.opcode = MMC_GO_IDLE_STATE;
114 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_NONE | MMC_CMD_BC;
116 err = mmc_wait_for_cmd(host, &cmd, 0);
120 if (!mmc_host_is_spi(host)) {
121 mmc_set_chip_select(host, MMC_CS_DONTCARE);
125 host->use_spi_crc = 0;
130 int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
132 struct mmc_command cmd = {0};
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;
141 for (i = 100; i; i--) {
142 err = mmc_wait_for_cmd(host, &cmd, 0);
146 /* if we're just probing, do a single pass */
150 /* otherwise wait until reset completes */
151 if (mmc_host_is_spi(host)) {
152 if (!(cmd.resp[0] & R1_SPI_IDLE))
155 if (cmd.resp[0] & MMC_CARD_BUSY)
164 if (rocr && !mmc_host_is_spi(host))
170 int mmc_all_send_cid(struct mmc_host *host, u32 *cid)
173 struct mmc_command cmd = {0};
178 cmd.opcode = MMC_ALL_SEND_CID;
180 cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR;
182 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
186 memcpy(cid, cmd.resp, sizeof(u32) * 4);
191 int mmc_set_relative_addr(struct mmc_card *card)
194 struct mmc_command cmd = {0};
199 cmd.opcode = MMC_SET_RELATIVE_ADDR;
200 cmd.arg = card->rca << 16;
201 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
203 err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
211 mmc_send_cxd_native(struct mmc_host *host, u32 arg, u32 *cxd, int opcode)
214 struct mmc_command cmd = {0};
221 cmd.flags = MMC_RSP_R2 | MMC_CMD_AC;
223 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
227 memcpy(cxd, cmd.resp, sizeof(u32) * 4);
233 mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host,
234 u32 opcode, void *buf, unsigned len)
236 struct mmc_request mrq;
237 struct mmc_command cmd = {0};
238 struct mmc_data data = {0};
239 struct scatterlist sg;
242 /* dma onto stack is unsafe/nonportable, but callers to this
243 * routine normally provide temporary on-stack buffers ...
245 data_buf = kmalloc(len, GFP_KERNEL);
246 if (data_buf == NULL)
249 memset(&mrq, 0, sizeof(struct mmc_request));
257 /* NOTE HACK: the MMC_RSP_SPI_R1 is always correct here, but we
258 * rely on callers to never use this with "native" calls for reading
259 * CSD or CID. Native versions of those commands use the R2 type,
260 * not R1 plus a data block.
262 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
266 data.flags = MMC_DATA_READ;
270 sg_init_one(&sg, data_buf, len);
272 if (opcode == MMC_SEND_CSD || opcode == MMC_SEND_CID) {
274 * The spec states that CSR and CID accesses have a timeout
275 * of 64 clock cycles.
278 data.timeout_clks = 64;
280 mmc_set_data_timeout(&data, card);
282 mmc_wait_for_req(host, &mrq);
284 memcpy(buf, data_buf, len);
295 int mmc_send_csd(struct mmc_card *card, u32 *csd)
299 if (!mmc_host_is_spi(card->host))
300 return mmc_send_cxd_native(card->host, card->rca << 16,
303 ret = mmc_send_cxd_data(card, card->host, MMC_SEND_CSD, csd, 16);
307 for (i = 0;i < 4;i++)
308 csd[i] = be32_to_cpu(csd[i]);
313 int mmc_send_cid(struct mmc_host *host, u32 *cid)
317 if (!mmc_host_is_spi(host)) {
320 return mmc_send_cxd_native(host, host->card->rca << 16,
324 ret = mmc_send_cxd_data(NULL, host, MMC_SEND_CID, cid, 16);
328 for (i = 0;i < 4;i++)
329 cid[i] = be32_to_cpu(cid[i]);
334 int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd)
336 return mmc_send_cxd_data(card, card->host, MMC_SEND_EXT_CSD,
340 int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp)
342 struct mmc_command cmd = {0};
345 cmd.opcode = MMC_SPI_READ_OCR;
346 cmd.arg = highcap ? (1 << 30) : 0;
347 cmd.flags = MMC_RSP_SPI_R3;
349 err = mmc_wait_for_cmd(host, &cmd, 0);
355 int mmc_spi_set_crc(struct mmc_host *host, int use_crc)
357 struct mmc_command cmd = {0};
360 cmd.opcode = MMC_SPI_CRC_ON_OFF;
361 cmd.flags = MMC_RSP_SPI_R1;
364 err = mmc_wait_for_cmd(host, &cmd, 0);
366 host->use_spi_crc = use_crc;
371 * mmc_switch - modify EXT_CSD register
372 * @card: the MMC card associated with the data transfer
373 * @set: cmd set values
374 * @index: EXT_CSD register index
375 * @value: value to program into EXT_CSD register
376 * @timeout_ms: timeout (ms) for operation performed by register write,
377 * timeout of zero implies maximum possible timeout
379 * Modifies the EXT_CSD register for selected card.
381 int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
382 unsigned int timeout_ms)
385 struct mmc_command cmd = {0};
391 cmd.opcode = MMC_SWITCH;
392 cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
396 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
397 cmd.cmd_timeout_ms = timeout_ms;
399 err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
403 /* Must check status to be sure of no errors */
405 err = mmc_send_status(card, &status);
408 if (card->host->caps & MMC_CAP_WAIT_WHILE_BUSY)
410 if (mmc_host_is_spi(card->host))
412 } while (R1_CURRENT_STATE(status) == 7);
414 if (mmc_host_is_spi(card->host)) {
415 if (status & R1_SPI_ILLEGAL_COMMAND)
418 if (status & 0xFDFFA000)
419 printk(KERN_WARNING "%s: unexpected status %#x after "
420 "switch", mmc_hostname(card->host), status);
421 if (status & R1_SWITCH_ERROR)
427 EXPORT_SYMBOL_GPL(mmc_switch);
429 int mmc_send_status(struct mmc_card *card, u32 *status)
432 struct mmc_command cmd = {0};
437 cmd.opcode = MMC_SEND_STATUS;
438 if (!mmc_host_is_spi(card->host))
439 cmd.arg = card->rca << 16;
440 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
442 err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
446 /* NOTE: callers are required to understand the difference
447 * between "native" and SPI format status words!
450 *status = cmd.resp[0];
456 mmc_send_bus_test(struct mmc_card *card, struct mmc_host *host, u8 opcode,
459 struct mmc_request mrq;
460 struct mmc_command cmd = {0};
461 struct mmc_data data = {0};
462 struct scatterlist sg;
466 static u8 testdata_8bit[8] = { 0x55, 0xaa, 0, 0, 0, 0, 0, 0 };
467 static u8 testdata_4bit[4] = { 0x5a, 0, 0, 0 };
469 /* dma onto stack is unsafe/nonportable, but callers to this
470 * routine normally provide temporary on-stack buffers ...
472 data_buf = kmalloc(len, GFP_KERNEL);
477 test_buf = testdata_8bit;
479 test_buf = testdata_4bit;
481 printk(KERN_ERR "%s: Invalid bus_width %d\n",
482 mmc_hostname(host), len);
487 if (opcode == MMC_BUS_TEST_W)
488 memcpy(data_buf, test_buf, len);
490 memset(&mrq, 0, sizeof(struct mmc_request));
497 /* NOTE HACK: the MMC_RSP_SPI_R1 is always correct here, but we
498 * rely on callers to never use this with "native" calls for reading
499 * CSD or CID. Native versions of those commands use the R2 type,
500 * not R1 plus a data block.
502 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
506 if (opcode == MMC_BUS_TEST_R)
507 data.flags = MMC_DATA_READ;
509 data.flags = MMC_DATA_WRITE;
513 sg_init_one(&sg, data_buf, len);
514 mmc_wait_for_req(host, &mrq);
516 if (opcode == MMC_BUS_TEST_R) {
517 for (i = 0; i < len / 4; i++)
518 if ((test_buf[i] ^ data_buf[i]) != 0xff) {
533 int mmc_bus_test(struct mmc_card *card, u8 bus_width)
537 if (bus_width == MMC_BUS_WIDTH_8)
539 else if (bus_width == MMC_BUS_WIDTH_4)
541 else if (bus_width == MMC_BUS_WIDTH_1)
542 return 0; /* no need for test */
547 * Ignore errors from BUS_TEST_W. BUS_TEST_R will fail if there
548 * is a problem. This improves chances that the test will work.
550 mmc_send_bus_test(card, card->host, MMC_BUS_TEST_W, width);
551 err = mmc_send_bus_test(card, card->host, MMC_BUS_TEST_R, width);