Commit 996903de authored by Minda Chen's avatar Minda Chen Committed by Ulf Hansson
Browse files

mmc: core: add core-level function for sending tuning commands 



According to the SD card spec, Add a manual tuning command function
for SDR104/HS200.
Sending command 19 or command 21 to read data and compare with the
tunning block pattern.

This patch will help to decrease some platform private codes in SDHCI
platform_execute_tuning() callbacks.

Signed-off-by: default avatarMinda Chen <Minda.Chen@csr.com>
Signed-off-by: default avatarBarry Song <Baohua.Song@csr.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent c6eb5880

drivers/mmc/core/mmc_ops.c

+70 −0
Original line number Diff line number Diff line
@@ -547,6 +547,76 @@ int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value, 
}

EXPORT_SYMBOL_GPL(mmc_switch);



int mmc_send_tuning(struct mmc_card *card)

{

	struct mmc_request mrq = {NULL};

	struct mmc_command cmd = {0};

	struct mmc_data data = {0};

	struct scatterlist sg;

	struct mmc_host *mmc = card->host;

	struct mmc_ios *ios = &mmc->ios;

	const u8 *tuning_block_pattern;

	int size, err = 0;

	u8 *data_buf;

	u32 opcode;



	if (ios->bus_width == MMC_BUS_WIDTH_8) {

		tuning_block_pattern = tuning_blk_pattern_8bit;

		size = sizeof(tuning_blk_pattern_8bit);

		opcode = MMC_SEND_TUNING_BLOCK_HS200;

	} else if (ios->bus_width == MMC_BUS_WIDTH_4) {

		tuning_block_pattern = tuning_blk_pattern_4bit;

		size = sizeof(tuning_blk_pattern_4bit);

		opcode = MMC_SEND_TUNING_BLOCK;

	} else

		return -EINVAL;



	data_buf = kzalloc(size, GFP_KERNEL);

	if (!data_buf)

		return -ENOMEM;



	mrq.cmd = &cmd;

	mrq.data = &data;



	cmd.opcode = opcode;

	cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;



	data.blksz = size;

	data.blocks = 1;

	data.flags = MMC_DATA_READ;



	/*

	 * According to the tuning specs, Tuning process

	 * is normally shorter 40 executions of CMD19,

	 * and timeout value should be shorter than 150 ms

	 */

	data.timeout_ns = 150 * NSEC_PER_MSEC;



	data.sg = &sg;

	data.sg_len = 1;

	sg_init_one(&sg, data_buf, size);



	mmc_wait_for_req(mmc, &mrq);



	if (cmd.error) {

		err = cmd.error;

		goto out;

	}



	if (data.error) {

		err = data.error;

		goto out;

	}



	if (memcmp(data_buf, tuning_block_pattern, size))

		err = -EIO;



out:

	kfree(data_buf);

	return err;

}

EXPORT_SYMBOL_GPL(mmc_send_tuning);



static int

mmc_send_bus_test(struct mmc_card *card, struct mmc_host *host, u8 opcode,

		  u8 len)

include/linux/mmc/core.h

+1 −0
Original line number Diff line number Diff line
@@ -154,6 +154,7 @@ extern void mmc_start_bkops(struct mmc_card *card, bool from_exception); 
extern int __mmc_switch(struct mmc_card *, u8, u8, u8, unsigned int, bool,

			bool, bool);

extern int mmc_switch(struct mmc_card *, u8, u8, u8, unsigned int);

extern int mmc_send_tuning(struct mmc_card *card);

extern int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd);



#define MMC_ERASE_ARG		0x00000000

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