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/scatterlist.h>
16 #include <linux/mmc/host.h>
17 #include <linux/mmc/card.h>
18 #include <linux/mmc/mmc.h>
19 #include <linux/mmc/sd.h>
24 int mmc_app_cmd(struct mmc_host *host, struct mmc_card *card)
27 struct mmc_command cmd = {0};
30 BUG_ON(card && (card->host != host));
32 cmd.opcode = MMC_APP_CMD;
35 cmd.arg = card->rca << 16;
36 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
39 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_BCR;
42 err = mmc_wait_for_cmd(host, &cmd, 0);
46 /* Check that card supported application commands */
47 if (!mmc_host_is_spi(host) && !(cmd.resp[0] & R1_APP_CMD))
52 EXPORT_SYMBOL_GPL(mmc_app_cmd);
55 * mmc_wait_for_app_cmd - start an application command and wait for
57 * @host: MMC host to start command
58 * @card: Card to send MMC_APP_CMD to
59 * @cmd: MMC command to start
60 * @retries: maximum number of retries
62 * Sends a MMC_APP_CMD, checks the card response, sends the command
63 * in the parameter and waits for it to complete. Return any error
64 * that occurred while the command was executing. Do not attempt to
67 int mmc_wait_for_app_cmd(struct mmc_host *host, struct mmc_card *card,
68 struct mmc_command *cmd, int retries)
70 struct mmc_request mrq = {NULL};
80 * We have to resend MMC_APP_CMD for each attempt so
81 * we cannot use the retries field in mmc_command.
83 for (i = 0;i <= retries;i++) {
84 err = mmc_app_cmd(host, card);
86 /* no point in retrying; no APP commands allowed */
87 if (mmc_host_is_spi(host)) {
88 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
94 memset(&mrq, 0, sizeof(struct mmc_request));
96 memset(cmd->resp, 0, sizeof(cmd->resp));
102 mmc_wait_for_req(host, &mrq);
108 /* no point in retrying illegal APP commands */
109 if (mmc_host_is_spi(host)) {
110 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
118 EXPORT_SYMBOL(mmc_wait_for_app_cmd);
120 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 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 = {0};
156 cmd.opcode = SD_APP_OP_COND;
157 if (mmc_host_is_spi(host))
158 cmd.arg = ocr & (1 << 30); /* SPI only defines one bit */
161 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
163 for (i = 100; i; i--) {
164 err = mmc_wait_for_app_cmd(host, NULL, &cmd, MMC_CMD_RETRIES);
168 /* if we're just probing, do a single pass */
172 /* otherwise wait until reset completes */
173 if (mmc_host_is_spi(host)) {
174 if (!(cmd.resp[0] & R1_SPI_IDLE))
177 if (cmd.resp[0] & MMC_CARD_BUSY)
186 if (rocr && !mmc_host_is_spi(host))
192 int mmc_send_if_cond(struct mmc_host *host, u32 ocr)
194 struct mmc_command cmd = {0};
196 static const u8 test_pattern = 0xAA;
200 * To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND
201 * before SD_APP_OP_COND. This command will harmlessly fail for
204 cmd.opcode = SD_SEND_IF_COND;
205 cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | test_pattern;
206 cmd.flags = MMC_RSP_SPI_R7 | MMC_RSP_R7 | MMC_CMD_BCR;
208 err = mmc_wait_for_cmd(host, &cmd, 0);
212 if (mmc_host_is_spi(host))
213 result_pattern = cmd.resp[1] & 0xFF;
215 result_pattern = cmd.resp[0] & 0xFF;
217 if (result_pattern != test_pattern)
223 int mmc_send_relative_addr(struct mmc_host *host, unsigned int *rca)
226 struct mmc_command cmd = {0};
231 cmd.opcode = SD_SEND_RELATIVE_ADDR;
233 cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
235 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
239 *rca = cmd.resp[0] >> 16;
244 int mmc_app_send_scr(struct mmc_card *card, u32 *scr)
247 struct mmc_request mrq = {NULL};
248 struct mmc_command cmd = {0};
249 struct mmc_data data = {0};
250 struct scatterlist sg;
257 /* NOTE: caller guarantees scr is heap-allocated */
259 err = mmc_app_cmd(card->host, card);
263 /* dma onto stack is unsafe/nonportable, but callers to this
264 * routine normally provide temporary on-stack buffers ...
266 data_buf = kmalloc(sizeof(card->raw_scr), GFP_KERNEL);
267 if (data_buf == NULL)
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, data_buf, 8);
285 mmc_set_data_timeout(&data, card);
287 mmc_wait_for_req(card->host, &mrq);
289 memcpy(scr, data_buf, sizeof(card->raw_scr));
297 scr[0] = be32_to_cpu(scr[0]);
298 scr[1] = be32_to_cpu(scr[1]);
303 int mmc_sd_switch(struct mmc_card *card, int mode, int group,
306 struct mmc_request mrq = {NULL};
307 struct mmc_command cmd = {0};
308 struct mmc_data data = {0};
309 struct scatterlist sg;
314 /* NOTE: caller guarantees resp is heap-allocated */
322 cmd.opcode = SD_SWITCH;
323 cmd.arg = mode << 31 | 0x00FFFFFF;
324 cmd.arg &= ~(0xF << (group * 4));
325 cmd.arg |= value << (group * 4);
326 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
330 data.flags = MMC_DATA_READ;
334 sg_init_one(&sg, resp, 64);
336 mmc_set_data_timeout(&data, card);
338 mmc_wait_for_req(card->host, &mrq);
348 int mmc_app_sd_status(struct mmc_card *card, void *ssr)
351 struct mmc_request mrq = {NULL};
352 struct mmc_command cmd = {0};
353 struct mmc_data data = {0};
354 struct scatterlist sg;
360 /* NOTE: caller guarantees ssr is heap-allocated */
362 err = mmc_app_cmd(card->host, card);
369 cmd.opcode = SD_APP_SD_STATUS;
371 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_ADTC;
375 data.flags = MMC_DATA_READ;
379 sg_init_one(&sg, ssr, 64);
381 mmc_set_data_timeout(&data, card);
383 mmc_wait_for_req(card->host, &mrq);