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 static int mmc_app_cmd(struct mmc_host *host, struct mmc_card *card)
27 struct mmc_command cmd;
30 BUG_ON(card && (card->host != host));
32 memset(&cmd, 0, sizeof(struct mmc_command));
34 cmd.opcode = MMC_APP_CMD;
37 cmd.arg = card->rca << 16;
38 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
41 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_BCR;
44 err = mmc_wait_for_cmd(host, &cmd, 0);
48 /* Check that card supported application commands */
49 if (!mmc_host_is_spi(host) && !(cmd.resp[0] & R1_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;
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)
124 struct mmc_command cmd;
129 memset(&cmd, 0, sizeof(struct mmc_command));
131 cmd.opcode = SD_APP_SET_BUS_WIDTH;
132 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
135 case MMC_BUS_WIDTH_1:
136 cmd.arg = SD_BUS_WIDTH_1;
138 case MMC_BUS_WIDTH_4:
139 cmd.arg = SD_BUS_WIDTH_4;
145 err = mmc_wait_for_app_cmd(card->host, card, &cmd, MMC_CMD_RETRIES);
152 int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
154 struct mmc_command cmd;
159 memset(&cmd, 0, sizeof(struct mmc_command));
161 cmd.opcode = SD_APP_OP_COND;
162 if (mmc_host_is_spi(host))
163 cmd.arg = ocr & (1 << 30); /* SPI only defines one bit */
166 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
168 for (i = 100; i; i--) {
169 err = mmc_wait_for_app_cmd(host, NULL, &cmd, MMC_CMD_RETRIES);
173 /* if we're just probing, do a single pass */
177 /* otherwise wait until reset completes */
178 if (mmc_host_is_spi(host)) {
179 if (!(cmd.resp[0] & R1_SPI_IDLE))
182 if (cmd.resp[0] & MMC_CARD_BUSY)
191 if (rocr && !mmc_host_is_spi(host))
197 int mmc_send_if_cond(struct mmc_host *host, u32 ocr)
199 struct mmc_command cmd;
201 static const u8 test_pattern = 0xAA;
205 * To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND
206 * before SD_APP_OP_COND. This command will harmlessly fail for
209 cmd.opcode = SD_SEND_IF_COND;
210 cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | test_pattern;
211 cmd.flags = MMC_RSP_SPI_R7 | MMC_RSP_R7 | MMC_CMD_BCR;
213 err = mmc_wait_for_cmd(host, &cmd, 0);
217 if (mmc_host_is_spi(host))
218 result_pattern = cmd.resp[1] & 0xFF;
220 result_pattern = cmd.resp[0] & 0xFF;
222 if (result_pattern != test_pattern)
228 int mmc_send_relative_addr(struct mmc_host *host, unsigned int *rca)
231 struct mmc_command cmd;
236 memset(&cmd, 0, sizeof(struct mmc_command));
238 cmd.opcode = SD_SEND_RELATIVE_ADDR;
240 cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
242 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
246 *rca = cmd.resp[0] >> 16;
251 int mmc_app_send_scr(struct mmc_card *card, u32 *scr)
254 struct mmc_request mrq;
255 struct mmc_command cmd;
256 struct mmc_data data;
257 struct scatterlist sg;
264 /* NOTE: caller guarantees scr is heap-allocated */
266 err = mmc_app_cmd(card->host, card);
270 /* dma onto stack is unsafe/nonportable, but callers to this
271 * routine normally provide temporary on-stack buffers ...
273 data_buf = kmalloc(sizeof(card->raw_scr), GFP_KERNEL);
274 if (data_buf == NULL)
277 memset(&mrq, 0, sizeof(struct mmc_request));
278 memset(&cmd, 0, sizeof(struct mmc_command));
279 memset(&data, 0, sizeof(struct mmc_data));
284 cmd.opcode = SD_APP_SEND_SCR;
286 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
290 data.flags = MMC_DATA_READ;
294 sg_init_one(&sg, data_buf, 8);
296 mmc_set_data_timeout(&data, card);
298 mmc_wait_for_req(card->host, &mrq);
300 memcpy(scr, data_buf, sizeof(card->raw_scr));
308 scr[0] = be32_to_cpu(scr[0]);
309 scr[1] = be32_to_cpu(scr[1]);
314 int mmc_sd_switch(struct mmc_card *card, int mode, int group,
317 struct mmc_request mrq;
318 struct mmc_command cmd;
319 struct mmc_data data;
320 struct scatterlist sg;
325 /* NOTE: caller guarantees resp is heap-allocated */
330 memset(&mrq, 0, sizeof(struct mmc_request));
331 memset(&cmd, 0, sizeof(struct mmc_command));
332 memset(&data, 0, sizeof(struct mmc_data));
337 cmd.opcode = SD_SWITCH;
338 cmd.arg = mode << 31 | 0x00FFFFFF;
339 cmd.arg &= ~(0xF << (group * 4));
340 cmd.arg |= value << (group * 4);
341 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
345 data.flags = MMC_DATA_READ;
349 sg_init_one(&sg, resp, 64);
351 mmc_set_data_timeout(&data, card);
353 mmc_wait_for_req(card->host, &mrq);
363 int mmc_app_sd_status(struct mmc_card *card, void *ssr)
366 struct mmc_request mrq;
367 struct mmc_command cmd;
368 struct mmc_data data;
369 struct scatterlist sg;
375 /* NOTE: caller guarantees ssr is heap-allocated */
377 err = mmc_app_cmd(card->host, card);
381 memset(&mrq, 0, sizeof(struct mmc_request));
382 memset(&cmd, 0, sizeof(struct mmc_command));
383 memset(&data, 0, sizeof(struct mmc_data));
388 cmd.opcode = SD_APP_SD_STATUS;
390 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_ADTC;
394 data.flags = MMC_DATA_READ;
398 sg_init_one(&sg, ssr, 64);
400 mmc_set_data_timeout(&data, card);
402 mmc_wait_for_req(card->host, &mrq);