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/types.h>
13 #include <linux/scatterlist.h>
15 #include <linux/mmc/host.h>
16 #include <linux/mmc/card.h>
17 #include <linux/mmc/mmc.h>
18 #include <linux/mmc/sd.h>
23 static int mmc_app_cmd(struct mmc_host *host, struct mmc_card *card)
26 struct mmc_command cmd;
29 BUG_ON(card && (card->host != host));
31 cmd.opcode = MMC_APP_CMD;
34 cmd.arg = card->rca << 16;
35 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
38 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_BCR;
41 err = mmc_wait_for_cmd(host, &cmd, 0);
45 /* Check that card supported application commands */
46 if (!mmc_host_is_spi(host) && !(cmd.resp[0] & R1_APP_CMD))
53 * mmc_wait_for_app_cmd - start an application command and wait for
55 * @host: MMC host to start command
56 * @card: Card to send MMC_APP_CMD to
57 * @cmd: MMC command to start
58 * @retries: maximum number of retries
60 * Sends a MMC_APP_CMD, checks the card response, sends the command
61 * in the parameter and waits for it to complete. Return any error
62 * that occurred while the command was executing. Do not attempt to
65 int mmc_wait_for_app_cmd(struct mmc_host *host, struct mmc_card *card,
66 struct mmc_command *cmd, int retries)
68 struct mmc_request mrq;
78 * We have to resend MMC_APP_CMD for each attempt so
79 * we cannot use the retries field in mmc_command.
81 for (i = 0;i <= retries;i++) {
82 err = mmc_app_cmd(host, card);
84 /* no point in retrying; no APP commands allowed */
85 if (mmc_host_is_spi(host)) {
86 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
92 memset(&mrq, 0, sizeof(struct mmc_request));
94 memset(cmd->resp, 0, sizeof(cmd->resp));
100 mmc_wait_for_req(host, &mrq);
106 /* no point in retrying illegal APP commands */
107 if (mmc_host_is_spi(host)) {
108 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
116 EXPORT_SYMBOL(mmc_wait_for_app_cmd);
118 int mmc_app_set_bus_width(struct mmc_card *card, int width)
121 struct mmc_command cmd;
126 memset(&cmd, 0, sizeof(struct mmc_command));
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 err = mmc_wait_for_app_cmd(card->host, card, &cmd, MMC_CMD_RETRIES);
149 int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
151 struct mmc_command cmd;
156 memset(&cmd, 0, sizeof(struct mmc_command));
158 cmd.opcode = SD_APP_OP_COND;
159 if (mmc_host_is_spi(host))
160 cmd.arg = ocr & (1 << 30); /* SPI only defines one bit */
163 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
165 for (i = 100; i; i--) {
166 err = mmc_wait_for_app_cmd(host, NULL, &cmd, MMC_CMD_RETRIES);
170 /* if we're just probing, do a single pass */
174 /* otherwise wait until reset completes */
175 if (mmc_host_is_spi(host)) {
176 if (!(cmd.resp[0] & R1_SPI_IDLE))
179 if (cmd.resp[0] & MMC_CARD_BUSY)
188 if (rocr && !mmc_host_is_spi(host))
194 int mmc_send_if_cond(struct mmc_host *host, u32 ocr)
196 struct mmc_command cmd;
198 static const u8 test_pattern = 0xAA;
202 * To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND
203 * before SD_APP_OP_COND. This command will harmlessly fail for
206 cmd.opcode = SD_SEND_IF_COND;
207 cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | test_pattern;
208 cmd.flags = MMC_RSP_SPI_R7 | MMC_RSP_R7 | MMC_CMD_BCR;
210 err = mmc_wait_for_cmd(host, &cmd, 0);
214 if (mmc_host_is_spi(host))
215 result_pattern = cmd.resp[1] & 0xFF;
217 result_pattern = cmd.resp[0] & 0xFF;
219 if (result_pattern != test_pattern)
225 int mmc_send_relative_addr(struct mmc_host *host, unsigned int *rca)
228 struct mmc_command cmd;
233 memset(&cmd, 0, sizeof(struct mmc_command));
235 cmd.opcode = SD_SEND_RELATIVE_ADDR;
237 cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
239 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
243 *rca = cmd.resp[0] >> 16;
248 int mmc_app_send_scr(struct mmc_card *card, u32 *scr)
251 struct mmc_request mrq;
252 struct mmc_command cmd;
253 struct mmc_data data;
254 struct scatterlist sg;
260 /* NOTE: caller guarantees scr is heap-allocated */
262 err = mmc_app_cmd(card->host, card);
266 memset(&mrq, 0, sizeof(struct mmc_request));
267 memset(&cmd, 0, sizeof(struct mmc_command));
268 memset(&data, 0, sizeof(struct mmc_data));
273 cmd.opcode = SD_APP_SEND_SCR;
275 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
279 data.flags = MMC_DATA_READ;
283 sg_init_one(&sg, scr, 8);
285 mmc_set_data_timeout(&data, card);
287 mmc_wait_for_req(card->host, &mrq);
294 scr[0] = be32_to_cpu(scr[0]);
295 scr[1] = be32_to_cpu(scr[1]);
300 int mmc_sd_switch(struct mmc_card *card, int mode, int group,
303 struct mmc_request mrq;
304 struct mmc_command cmd;
305 struct mmc_data data;
306 struct scatterlist sg;
311 /* NOTE: caller guarantees resp is heap-allocated */
316 memset(&mrq, 0, sizeof(struct mmc_request));
317 memset(&cmd, 0, sizeof(struct mmc_command));
318 memset(&data, 0, sizeof(struct mmc_data));
323 cmd.opcode = SD_SWITCH;
324 cmd.arg = mode << 31 | 0x00FFFFFF;
325 cmd.arg &= ~(0xF << (group * 4));
326 cmd.arg |= value << (group * 4);
327 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
331 data.flags = MMC_DATA_READ;
335 sg_init_one(&sg, resp, 64);
337 mmc_set_data_timeout(&data, card);
339 mmc_wait_for_req(card->host, &mrq);
349 int mmc_app_sd_status(struct mmc_card *card, void *ssr)
352 struct mmc_request mrq;
353 struct mmc_command cmd;
354 struct mmc_data data;
355 struct scatterlist sg;
361 /* NOTE: caller guarantees ssr is heap-allocated */
363 err = mmc_app_cmd(card->host, card);
367 memset(&mrq, 0, sizeof(struct mmc_request));
368 memset(&cmd, 0, sizeof(struct mmc_command));
369 memset(&data, 0, sizeof(struct mmc_data));
374 cmd.opcode = SD_APP_SD_STATUS;
376 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_ADTC;
380 data.flags = MMC_DATA_READ;
384 sg_init_one(&sg, ssr, 64);
386 mmc_set_data_timeout(&data, card);
388 mmc_wait_for_req(card->host, &mrq);