[net-next-2.6.git] / drivers / mmc / core / sd_ops.c

/*
 *  linux/drivers/mmc/core/sd_ops.h
 *
 *  Copyright 2006-2007 Pierre Ossman
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 */

#include <linux/types.h>
#include <linux/scatterlist.h>

#include <linux/mmc/host.h>
#include <linux/mmc/card.h>
#include <linux/mmc/mmc.h>
#include <linux/mmc/sd.h>

#include "core.h"
#include "sd_ops.h"

static int mmc_app_cmd(struct mmc_host *host, struct mmc_card *card)
{
	int err;
	struct mmc_command cmd;

	BUG_ON(!host);
	BUG_ON(card && (card->host != host));

	cmd.opcode = MMC_APP_CMD;

	if (card) {
		cmd.arg = card->rca << 16;
		cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
	} else {
		cmd.arg = 0;
		cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_BCR;
	}

	err = mmc_wait_for_cmd(host, &cmd, 0);
	if (err)
		return err;

	/* Check that card supported application commands */
	if (!mmc_host_is_spi(host) && !(cmd.resp[0] & R1_APP_CMD))
		return -EOPNOTSUPP;

	return 0;
}

/**
 *	mmc_wait_for_app_cmd - start an application command and wait for
 			       completion
 *	@host: MMC host to start command
 *	@card: Card to send MMC_APP_CMD to
 *	@cmd: MMC command to start
 *	@retries: maximum number of retries
 *
 *	Sends a MMC_APP_CMD, checks the card response, sends the command
 *	in the parameter and waits for it to complete. Return any error
 *	that occurred while the command was executing.  Do not attempt to
 *	parse the response.
 */
int mmc_wait_for_app_cmd(struct mmc_host *host, struct mmc_card *card,
	struct mmc_command *cmd, int retries)
{
	struct mmc_request mrq;

	int i, err;

	BUG_ON(!cmd);
	BUG_ON(retries < 0);

	err = -EIO;

	/*
	 * We have to resend MMC_APP_CMD for each attempt so
	 * we cannot use the retries field in mmc_command.
	 */
	for (i = 0;i <= retries;i++) {
		err = mmc_app_cmd(host, card);
		if (err) {
			/* no point in retrying; no APP commands allowed */
			if (mmc_host_is_spi(host)) {
				if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
					break;
			}
			continue;
		}

		memset(&mrq, 0, sizeof(struct mmc_request));

		memset(cmd->resp, 0, sizeof(cmd->resp));
		cmd->retries = 0;

		mrq.cmd = cmd;
		cmd->data = NULL;

		mmc_wait_for_req(host, &mrq);

		err = cmd->error;
		if (!cmd->error)
			break;

		/* no point in retrying illegal APP commands */
		if (mmc_host_is_spi(host)) {
			if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
				break;
		}
	}

	return err;
}

EXPORT_SYMBOL(mmc_wait_for_app_cmd);

int mmc_app_set_bus_width(struct mmc_card *card, int width)
{
	int err;
	struct mmc_command cmd;

	BUG_ON(!card);
	BUG_ON(!card->host);

	memset(&cmd, 0, sizeof(struct mmc_command));

	cmd.opcode = SD_APP_SET_BUS_WIDTH;
	cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;

	switch (width) {
	case MMC_BUS_WIDTH_1:
		cmd.arg = SD_BUS_WIDTH_1;
		break;
	case MMC_BUS_WIDTH_4:
		cmd.arg = SD_BUS_WIDTH_4;
		break;
	default:
		return -EINVAL;
	}

	err = mmc_wait_for_app_cmd(card->host, card, &cmd, MMC_CMD_RETRIES);
	if (err)
		return err;

	return 0;
}

int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
{
	struct mmc_command cmd;
	int i, err = 0;

	BUG_ON(!host);

	memset(&cmd, 0, sizeof(struct mmc_command));

	cmd.opcode = SD_APP_OP_COND;
	if (mmc_host_is_spi(host))
		cmd.arg = ocr & (1 << 30); /* SPI only defines one bit */
	else
		cmd.arg = ocr;
	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;

	for (i = 100; i; i--) {
		err = mmc_wait_for_app_cmd(host, NULL, &cmd, MMC_CMD_RETRIES);
		if (err)
			break;

		/* if we're just probing, do a single pass */
		if (ocr == 0)
			break;

		/* otherwise wait until reset completes */
		if (mmc_host_is_spi(host)) {
			if (!(cmd.resp[0] & R1_SPI_IDLE))
				break;
		} else {
			if (cmd.resp[0] & MMC_CARD_BUSY)
				break;
		}

		err = -ETIMEDOUT;

		mmc_delay(10);
	}

	if (rocr && !mmc_host_is_spi(host))
		*rocr = cmd.resp[0];

	return err;
}

int mmc_send_if_cond(struct mmc_host *host, u32 ocr)
{
	struct mmc_command cmd;
	int err;
	static const u8 test_pattern = 0xAA;
	u8 result_pattern;

	/*
	 * To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND
	 * before SD_APP_OP_COND. This command will harmlessly fail for
	 * SD 1.0 cards.
	 */
	cmd.opcode = SD_SEND_IF_COND;
	cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | test_pattern;
	cmd.flags = MMC_RSP_SPI_R7 | MMC_RSP_R7 | MMC_CMD_BCR;

	err = mmc_wait_for_cmd(host, &cmd, 0);
	if (err)
		return err;

	if (mmc_host_is_spi(host))
		result_pattern = cmd.resp[1] & 0xFF;
	else
		result_pattern = cmd.resp[0] & 0xFF;

	if (result_pattern != test_pattern)
		return -EIO;

	return 0;
}

int mmc_send_relative_addr(struct mmc_host *host, unsigned int *rca)
{
	int err;
	struct mmc_command cmd;

	BUG_ON(!host);
	BUG_ON(!rca);

	memset(&cmd, 0, sizeof(struct mmc_command));

	cmd.opcode = SD_SEND_RELATIVE_ADDR;
	cmd.arg = 0;
	cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;

	err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
	if (err)
		return err;

	*rca = cmd.resp[0] >> 16;

	return 0;
}

int mmc_app_send_scr(struct mmc_card *card, u32 *scr)
{
	int err;
	struct mmc_request mrq;
	struct mmc_command cmd;
	struct mmc_data data;
	struct scatterlist sg;

	BUG_ON(!card);
	BUG_ON(!card->host);
	BUG_ON(!scr);

	/* NOTE: caller guarantees scr is heap-allocated */

	err = mmc_app_cmd(card->host, card);
	if (err)
		return err;

	memset(&mrq, 0, sizeof(struct mmc_request));
	memset(&cmd, 0, sizeof(struct mmc_command));
	memset(&data, 0, sizeof(struct mmc_data));

	mrq.cmd = &cmd;
	mrq.data = &data;

	cmd.opcode = SD_APP_SEND_SCR;
	cmd.arg = 0;
	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;

	data.blksz = 8;
	data.blocks = 1;
	data.flags = MMC_DATA_READ;
	data.sg = &sg;
	data.sg_len = 1;

	sg_init_one(&sg, scr, 8);

	mmc_set_data_timeout(&data, card);

	mmc_wait_for_req(card->host, &mrq);

	if (cmd.error)
		return cmd.error;
	if (data.error)
		return data.error;

	scr[0] = be32_to_cpu(scr[0]);
	scr[1] = be32_to_cpu(scr[1]);

	return 0;
}

int mmc_sd_switch(struct mmc_card *card, int mode, int group,
	u8 value, u8 *resp)
{
	struct mmc_request mrq;
	struct mmc_command cmd;
	struct mmc_data data;
	struct scatterlist sg;

	BUG_ON(!card);
	BUG_ON(!card->host);

	/* NOTE: caller guarantees resp is heap-allocated */

	mode = !!mode;
	value &= 0xF;

	memset(&mrq, 0, sizeof(struct mmc_request));
	memset(&cmd, 0, sizeof(struct mmc_command));
	memset(&data, 0, sizeof(struct mmc_data));

	mrq.cmd = &cmd;
	mrq.data = &data;

	cmd.opcode = SD_SWITCH;
	cmd.arg = mode << 31 | 0x00FFFFFF;
	cmd.arg &= ~(0xF << (group * 4));
	cmd.arg |= value << (group * 4);
	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;

	data.blksz = 64;
	data.blocks = 1;
	data.flags = MMC_DATA_READ;
	data.sg = &sg;
	data.sg_len = 1;

	sg_init_one(&sg, resp, 64);

	mmc_set_data_timeout(&data, card);

	mmc_wait_for_req(card->host, &mrq);

	if (cmd.error)
		return cmd.error;
	if (data.error)
		return data.error;

	return 0;
}

int mmc_app_sd_status(struct mmc_card *card, void *ssr)
{
	int err;
	struct mmc_request mrq;
	struct mmc_command cmd;
	struct mmc_data data;
	struct scatterlist sg;

	BUG_ON(!card);
	BUG_ON(!card->host);
	BUG_ON(!ssr);

	/* NOTE: caller guarantees ssr is heap-allocated */

	err = mmc_app_cmd(card->host, card);
	if (err)
		return err;

	memset(&mrq, 0, sizeof(struct mmc_request));
	memset(&cmd, 0, sizeof(struct mmc_command));
	memset(&data, 0, sizeof(struct mmc_data));

	mrq.cmd = &cmd;
	mrq.data = &data;

	cmd.opcode = SD_APP_SD_STATUS;
	cmd.arg = 0;
	cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_ADTC;

	data.blksz = 64;
	data.blocks = 1;
	data.flags = MMC_DATA_READ;
	data.sg = &sg;
	data.sg_len = 1;

	sg_init_one(&sg, ssr, 64);

	mmc_set_data_timeout(&data, card);

	mmc_wait_for_req(card->host, &mrq);

	if (cmd.error)
		return cmd.error;
	if (data.error)
		return data.error;

	return 0;
}
Commit	Line	Data
da7fbe58	1	/*
70f10482	2	* linux/drivers/mmc/core/sd_ops.h
da7fbe58 PO	3	*
	4	* Copyright 2006-2007 Pierre Ossman
	5	*
	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.
	10	*/
	11
	12	#include <linux/types.h>
da7fbe58 PO	13	#include <linux/scatterlist.h>
	14
	15	#include <linux/mmc/host.h>
	16	#include <linux/mmc/card.h>
	17	#include <linux/mmc/mmc.h>
	18	#include <linux/mmc/sd.h>
	19
	20	#include "core.h"
	21	#include "sd_ops.h"
	22
39361851 AB	23	static int mmc_app_cmd(struct mmc_host host, struct mmc_card card)
	24	{
	25	int err;
	26	struct mmc_command cmd;
	27
	28	BUG_ON(!host);
	29	BUG_ON(card && (card->host != host));
	30
	31	cmd.opcode = MMC_APP_CMD;
	32
	33	if (card) {
	34	cmd.arg = card->rca << 16;
af517150	35	cmd.flags = MMC_RSP_SPI_R1 \| MMC_RSP_R1 \| MMC_CMD_AC;
39361851 AB	36	} else {
39361851 AB	37	cmd.arg = 0;
af517150	38	cmd.flags = MMC_RSP_SPI_R1 \| MMC_RSP_R1 \| MMC_CMD_BCR;
39361851 AB	39	}
	40
	41	err = mmc_wait_for_cmd(host, &cmd, 0);
17b0429d	42	if (err)
39361851 AB	43	return err;
	44
	45	/* Check that card supported application commands */
af517150	46	if (!mmc_host_is_spi(host) && !(cmd.resp[0] & R1_APP_CMD))
17b0429d	47	return -EOPNOTSUPP;
39361851	48
17b0429d	49	return 0;
39361851 AB	50	}
39361851 AB	51
da7fbe58 PO	52	/**
	53	* mmc_wait_for_app_cmd - start an application command and wait for
	54	completion
	55	* @host: MMC host to start command
67a61c48	56	* @card: Card to send MMC_APP_CMD to
da7fbe58 PO	57	* @cmd: MMC command to start
	58	* @retries: maximum number of retries
	59	*
	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
	63	* parse the response.
	64	*/
	65	int mmc_wait_for_app_cmd(struct mmc_host host, struct mmc_card card,
	66	struct mmc_command *cmd, int retries)
	67	{
	68	struct mmc_request mrq;
	69
	70	int i, err;
	71
	72	BUG_ON(!cmd);
	73	BUG_ON(retries < 0);
	74
17b0429d	75	err = -EIO;
da7fbe58 PO	76
	77	/*
	78	* We have to resend MMC_APP_CMD for each attempt so
	79	* we cannot use the retries field in mmc_command.
	80	*/
	81	for (i = 0;i <= retries;i++) {
da7fbe58	82	err = mmc_app_cmd(host, card);
af517150 DB	83	if (err) {
	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)
	87	break;
	88	}
da7fbe58	89	continue;
af517150	90	}
da7fbe58 PO	91
	92	memset(&mrq, 0, sizeof(struct mmc_request));
	93
	94	memset(cmd->resp, 0, sizeof(cmd->resp));
	95	cmd->retries = 0;
	96
	97	mrq.cmd = cmd;
	98	cmd->data = NULL;
	99
	100	mmc_wait_for_req(host, &mrq);
	101
	102	err = cmd->error;
17b0429d	103	if (!cmd->error)
da7fbe58	104	break;
af517150 DB	105
	106	/* no point in retrying illegal APP commands */
	107	if (mmc_host_is_spi(host)) {
	108	if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
	109	break;
	110	}
da7fbe58 PO	111	}
	112
	113	return err;
	114	}
	115
	116	EXPORT_SYMBOL(mmc_wait_for_app_cmd);
	117
da7fbe58 PO	118	int mmc_app_set_bus_width(struct mmc_card *card, int width)
	119	{
	120	int err;
	121	struct mmc_command cmd;
	122
	123	BUG_ON(!card);
	124	BUG_ON(!card->host);
	125
	126	memset(&cmd, 0, sizeof(struct mmc_command));
	127
	128	cmd.opcode = SD_APP_SET_BUS_WIDTH;
	129	cmd.flags = MMC_RSP_R1 \| MMC_CMD_AC;
	130
	131	switch (width) {
	132	case MMC_BUS_WIDTH_1:
	133	cmd.arg = SD_BUS_WIDTH_1;
	134	break;
	135	case MMC_BUS_WIDTH_4:
	136	cmd.arg = SD_BUS_WIDTH_4;
	137	break;
	138	default:
17b0429d	139	return -EINVAL;
da7fbe58 PO	140	}
	141
	142	err = mmc_wait_for_app_cmd(card->host, card, &cmd, MMC_CMD_RETRIES);
17b0429d	143	if (err)
da7fbe58 PO	144	return err;
da7fbe58 PO	145
17b0429d	146	return 0;
da7fbe58 PO	147	}
	148
	149	int mmc_send_app_op_cond(struct mmc_host host, u32 ocr, u32 rocr)
	150	{
	151	struct mmc_command cmd;
	152	int i, err = 0;
	153
	154	BUG_ON(!host);
	155
	156	memset(&cmd, 0, sizeof(struct mmc_command));
	157
	158	cmd.opcode = SD_APP_OP_COND;
af517150 DB	159	if (mmc_host_is_spi(host))
	160	cmd.arg = ocr & (1 << 30); /* SPI only defines one bit */
	161	else
	162	cmd.arg = ocr;
	163	cmd.flags = MMC_RSP_SPI_R1 \| MMC_RSP_R3 \| MMC_CMD_BCR;
da7fbe58 PO	164
	165	for (i = 100; i; i--) {
	166	err = mmc_wait_for_app_cmd(host, NULL, &cmd, MMC_CMD_RETRIES);
17b0429d	167	if (err)
da7fbe58 PO	168	break;
da7fbe58 PO	169
af517150 DB	170	/* if we're just probing, do a single pass */
af517150 DB	171	if (ocr == 0)
da7fbe58 PO	172	break;
da7fbe58 PO	173
af517150 DB	174	/* otherwise wait until reset completes */
	175	if (mmc_host_is_spi(host)) {
	176	if (!(cmd.resp[0] & R1_SPI_IDLE))
	177	break;
	178	} else {
	179	if (cmd.resp[0] & MMC_CARD_BUSY)
	180	break;
	181	}
	182
17b0429d	183	err = -ETIMEDOUT;
da7fbe58 PO	184
	185	mmc_delay(10);
	186	}
	187
af517150	188	if (rocr && !mmc_host_is_spi(host))
da7fbe58 PO	189	*rocr = cmd.resp[0];
	190
	191	return err;
	192	}
	193
	194	int mmc_send_if_cond(struct mmc_host *host, u32 ocr)
	195	{
	196	struct mmc_command cmd;
	197	int err;
	198	static const u8 test_pattern = 0xAA;
af517150	199	u8 result_pattern;
da7fbe58 PO	200
	201	/*
	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
	204	* SD 1.0 cards.
	205	*/
	206	cmd.opcode = SD_SEND_IF_COND;
	207	cmd.arg = ((ocr & 0xFF8000) != 0) << 8 \| test_pattern;
af517150	208	cmd.flags = MMC_RSP_SPI_R7 \| MMC_RSP_R7 \| MMC_CMD_BCR;
da7fbe58 PO	209
da7fbe58 PO	210	err = mmc_wait_for_cmd(host, &cmd, 0);
17b0429d	211	if (err)
da7fbe58 PO	212	return err;
da7fbe58 PO	213
af517150 DB	214	if (mmc_host_is_spi(host))
	215	result_pattern = cmd.resp[1] & 0xFF;
	216	else
	217	result_pattern = cmd.resp[0] & 0xFF;
	218
	219	if (result_pattern != test_pattern)
17b0429d	220	return -EIO;
da7fbe58	221
17b0429d	222	return 0;
da7fbe58 PO	223	}
	224
	225	int mmc_send_relative_addr(struct mmc_host host, unsigned int rca)
	226	{
	227	int err;
	228	struct mmc_command cmd;
	229
	230	BUG_ON(!host);
	231	BUG_ON(!rca);
	232
	233	memset(&cmd, 0, sizeof(struct mmc_command));
	234
	235	cmd.opcode = SD_SEND_RELATIVE_ADDR;
	236	cmd.arg = 0;
	237	cmd.flags = MMC_RSP_R6 \| MMC_CMD_BCR;
	238
	239	err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
17b0429d	240	if (err)
da7fbe58 PO	241	return err;
	242
	243	*rca = cmd.resp[0] >> 16;
	244
17b0429d	245	return 0;
da7fbe58 PO	246	}
	247
	248	int mmc_app_send_scr(struct mmc_card card, u32 scr)
	249	{
	250	int err;
	251	struct mmc_request mrq;
	252	struct mmc_command cmd;
	253	struct mmc_data data;
	254	struct scatterlist sg;
	255
	256	BUG_ON(!card);
	257	BUG_ON(!card->host);
	258	BUG_ON(!scr);
	259
af517150 DB	260	/* NOTE: caller guarantees scr is heap-allocated */
af517150 DB	261
da7fbe58	262	err = mmc_app_cmd(card->host, card);
17b0429d	263	if (err)
da7fbe58 PO	264	return err;
	265
	266	memset(&mrq, 0, sizeof(struct mmc_request));
	267	memset(&cmd, 0, sizeof(struct mmc_command));
	268	memset(&data, 0, sizeof(struct mmc_data));
	269
	270	mrq.cmd = &cmd;
	271	mrq.data = &data;
	272
	273	cmd.opcode = SD_APP_SEND_SCR;
	274	cmd.arg = 0;
af517150	275	cmd.flags = MMC_RSP_SPI_R1 \| MMC_RSP_R1 \| MMC_CMD_ADTC;
da7fbe58 PO	276
	277	data.blksz = 8;
	278	data.blocks = 1;
	279	data.flags = MMC_DATA_READ;
	280	data.sg = &sg;
	281	data.sg_len = 1;
	282
	283	sg_init_one(&sg, scr, 8);
	284
b146d26a	285	mmc_set_data_timeout(&data, card);
da7fbe58 PO	286
	287	mmc_wait_for_req(card->host, &mrq);
	288
17b0429d	289	if (cmd.error)
da7fbe58	290	return cmd.error;
17b0429d	291	if (data.error)
da7fbe58 PO	292	return data.error;
da7fbe58 PO	293
1fa8dd14 PO	294	scr[0] = be32_to_cpu(scr[0]);
1fa8dd14 PO	295	scr[1] = be32_to_cpu(scr[1]);
da7fbe58	296
17b0429d	297	return 0;
da7fbe58 PO	298	}
	299
	300	int mmc_sd_switch(struct mmc_card *card, int mode, int group,
	301	u8 value, u8 *resp)
	302	{
	303	struct mmc_request mrq;
	304	struct mmc_command cmd;
	305	struct mmc_data data;
	306	struct scatterlist sg;
	307
	308	BUG_ON(!card);
	309	BUG_ON(!card->host);
	310
af517150 DB	311	/* NOTE: caller guarantees resp is heap-allocated */
af517150 DB	312
da7fbe58 PO	313	mode = !!mode;
	314	value &= 0xF;
	315
	316	memset(&mrq, 0, sizeof(struct mmc_request));
	317	memset(&cmd, 0, sizeof(struct mmc_command));
	318	memset(&data, 0, sizeof(struct mmc_data));
	319
	320	mrq.cmd = &cmd;
	321	mrq.data = &data;
	322
	323	cmd.opcode = SD_SWITCH;
	324	cmd.arg = mode << 31 \| 0x00FFFFFF;
	325	cmd.arg &= ~(0xF << (group * 4));
	326	cmd.arg \|= value << (group * 4);
af517150	327	cmd.flags = MMC_RSP_SPI_R1 \| MMC_RSP_R1 \| MMC_CMD_ADTC;
da7fbe58 PO	328
	329	data.blksz = 64;
	330	data.blocks = 1;
	331	data.flags = MMC_DATA_READ;
	332	data.sg = &sg;
	333	data.sg_len = 1;
	334
	335	sg_init_one(&sg, resp, 64);
	336
b146d26a	337	mmc_set_data_timeout(&data, card);
da7fbe58 PO	338
	339	mmc_wait_for_req(card->host, &mrq);
	340
17b0429d	341	if (cmd.error)
da7fbe58	342	return cmd.error;
17b0429d	343	if (data.error)
da7fbe58 PO	344	return data.error;
da7fbe58 PO	345
17b0429d	346	return 0;
da7fbe58 PO	347	}
da7fbe58 PO	348
dfe86cba AH	349	int mmc_app_sd_status(struct mmc_card card, void ssr)
	350	{
	351	int err;
	352	struct mmc_request mrq;
	353	struct mmc_command cmd;
	354	struct mmc_data data;
	355	struct scatterlist sg;
	356
	357	BUG_ON(!card);
	358	BUG_ON(!card->host);
	359	BUG_ON(!ssr);
	360
	361	/* NOTE: caller guarantees ssr is heap-allocated */
	362
	363	err = mmc_app_cmd(card->host, card);
	364	if (err)
	365	return err;
	366
	367	memset(&mrq, 0, sizeof(struct mmc_request));
	368	memset(&cmd, 0, sizeof(struct mmc_command));
	369	memset(&data, 0, sizeof(struct mmc_data));
	370
	371	mrq.cmd = &cmd;
	372	mrq.data = &data;
	373
	374	cmd.opcode = SD_APP_SD_STATUS;
	375	cmd.arg = 0;
	376	cmd.flags = MMC_RSP_SPI_R2 \| MMC_RSP_R1 \| MMC_CMD_ADTC;
	377
	378	data.blksz = 64;
	379	data.blocks = 1;
	380	data.flags = MMC_DATA_READ;
	381	data.sg = &sg;
	382	data.sg_len = 1;
	383
	384	sg_init_one(&sg, ssr, 64);
	385
	386	mmc_set_data_timeout(&data, card);
	387
	388	mmc_wait_for_req(card->host, &mrq);
	389
	390	if (cmd.error)
	391	return cmd.error;
	392	if (data.error)
	393	return data.error;
	394
	395	return 0;
	396	}