2 * linux/drivers/mmc/core/sd_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/export.h>
15 #include <linux/scatterlist.h>
17 #include <linux/mmc/host.h>
18 #include <linux/mmc/card.h>
19 #include <linux/mmc/mmc.h>
20 #include <linux/mmc/sd.h>
25 int mmc_app_cmd(struct mmc_host *host, struct mmc_card *card)
28 struct mmc_command cmd = {0};
31 BUG_ON(card && (card->host != host));
33 cmd.opcode = MMC_APP_CMD;
36 cmd.arg = card->rca << 16;
37 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
40 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_BCR;
43 err = mmc_wait_for_cmd(host, &cmd, 0);
47 /* Check that card supported application commands */
48 if (!mmc_host_is_spi(host) && !(cmd.resp[0] & R1_APP_CMD))
53 EXPORT_SYMBOL_GPL(mmc_app_cmd);
56 * mmc_wait_for_app_cmd - start an application command and wait for
58 * @host: MMC host to start command
59 * @card: Card to send MMC_APP_CMD to
60 * @cmd: MMC command to start
61 * @retries: maximum number of retries
63 * Sends a MMC_APP_CMD, checks the card response, sends the command
64 * in the parameter and waits for it to complete. Return any error
65 * that occurred while the command was executing. Do not attempt to
68 int mmc_wait_for_app_cmd(struct mmc_host *host, struct mmc_card *card,
69 struct mmc_command *cmd, int retries)
71 struct mmc_request mrq = {NULL};
81 * We have to resend MMC_APP_CMD for each attempt so
82 * we cannot use the retries field in mmc_command.
84 for (i = 0;i <= retries;i++) {
85 err = mmc_app_cmd(host, card);
87 /* no point in retrying; no APP commands allowed */
88 if (mmc_host_is_spi(host)) {
89 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
95 memset(&mrq, 0, sizeof(struct mmc_request));
97 memset(cmd->resp, 0, sizeof(cmd->resp));
103 mmc_wait_for_req(host, &mrq);
109 /* no point in retrying illegal APP commands */
110 if (mmc_host_is_spi(host)) {
111 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
119 EXPORT_SYMBOL(mmc_wait_for_app_cmd);
121 int mmc_app_set_bus_width(struct mmc_card *card, int width)
123 struct mmc_command cmd = {0};
128 cmd.opcode = SD_APP_SET_BUS_WIDTH;
129 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
132 case MMC_BUS_WIDTH_1:
133 cmd.arg = SD_BUS_WIDTH_1;
135 case MMC_BUS_WIDTH_4:
136 cmd.arg = SD_BUS_WIDTH_4;
142 return mmc_wait_for_app_cmd(card->host, card, &cmd, MMC_CMD_RETRIES);
145 int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
147 struct mmc_command cmd = {0};
152 cmd.opcode = SD_APP_OP_COND;
153 if (mmc_host_is_spi(host))
154 cmd.arg = ocr & (1 << 30); /* SPI only defines one bit */
157 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
159 for (i = 100; i; i--) {
160 err = mmc_wait_for_app_cmd(host, NULL, &cmd, MMC_CMD_RETRIES);
164 /* if we're just probing, do a single pass */
168 /* otherwise wait until reset completes */
169 if (mmc_host_is_spi(host)) {
170 if (!(cmd.resp[0] & R1_SPI_IDLE))
173 if (cmd.resp[0] & MMC_CARD_BUSY)
183 pr_err("%s: card never left busy state\n", mmc_hostname(host));
185 if (rocr && !mmc_host_is_spi(host))
191 int mmc_send_if_cond(struct mmc_host *host, u32 ocr)
193 struct mmc_command cmd = {0};
195 static const u8 test_pattern = 0xAA;
199 * To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND
200 * before SD_APP_OP_COND. This command will harmlessly fail for
203 cmd.opcode = SD_SEND_IF_COND;
204 cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | test_pattern;
205 cmd.flags = MMC_RSP_SPI_R7 | MMC_RSP_R7 | MMC_CMD_BCR;
207 err = mmc_wait_for_cmd(host, &cmd, 0);
211 if (mmc_host_is_spi(host))
212 result_pattern = cmd.resp[1] & 0xFF;
214 result_pattern = cmd.resp[0] & 0xFF;
216 if (result_pattern != test_pattern)
222 int mmc_send_relative_addr(struct mmc_host *host, unsigned int *rca)
225 struct mmc_command cmd = {0};
230 cmd.opcode = SD_SEND_RELATIVE_ADDR;
232 cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
234 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
238 *rca = cmd.resp[0] >> 16;
243 int mmc_app_send_scr(struct mmc_card *card, u32 *scr)
246 struct mmc_request mrq = {NULL};
247 struct mmc_command cmd = {0};
248 struct mmc_data data = {0};
249 struct scatterlist sg;
256 /* NOTE: caller guarantees scr is heap-allocated */
258 err = mmc_app_cmd(card->host, card);
262 /* dma onto stack is unsafe/nonportable, but callers to this
263 * routine normally provide temporary on-stack buffers ...
265 data_buf = kmalloc(sizeof(card->raw_scr), GFP_KERNEL);
266 if (data_buf == NULL)
272 cmd.opcode = SD_APP_SEND_SCR;
274 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
278 data.flags = MMC_DATA_READ;
282 sg_init_one(&sg, data_buf, 8);
284 mmc_set_data_timeout(&data, card);
286 mmc_wait_for_req(card->host, &mrq);
288 memcpy(scr, data_buf, sizeof(card->raw_scr));
296 scr[0] = be32_to_cpu(scr[0]);
297 scr[1] = be32_to_cpu(scr[1]);
302 int mmc_sd_switch(struct mmc_card *card, int mode, int group,
305 struct mmc_request mrq = {NULL};
306 struct mmc_command cmd = {0};
307 struct mmc_data data = {0};
308 struct scatterlist sg;
313 /* NOTE: caller guarantees resp is heap-allocated */
321 cmd.opcode = SD_SWITCH;
322 cmd.arg = mode << 31 | 0x00FFFFFF;
323 cmd.arg &= ~(0xF << (group * 4));
324 cmd.arg |= value << (group * 4);
325 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
329 data.flags = MMC_DATA_READ;
333 sg_init_one(&sg, resp, 64);
335 mmc_set_data_timeout(&data, card);
337 mmc_wait_for_req(card->host, &mrq);
347 int mmc_app_sd_status(struct mmc_card *card, void *ssr)
350 struct mmc_request mrq = {NULL};
351 struct mmc_command cmd = {0};
352 struct mmc_data data = {0};
353 struct scatterlist sg;
359 /* NOTE: caller guarantees ssr is heap-allocated */
361 err = mmc_app_cmd(card->host, card);
368 cmd.opcode = SD_APP_SD_STATUS;
370 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_ADTC;
374 data.flags = MMC_DATA_READ;
378 sg_init_one(&sg, ssr, 64);
380 mmc_set_data_timeout(&data, card);
382 mmc_wait_for_req(card->host, &mrq);