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

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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: Minda Chen <Minda.Chen@csr.com>
Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Minda Chen 2014-11-26 13:05:33 +08:00 committed by Ulf Hansson
parent c6eb588028
commit 996903de92
2 changed files with 71 additions and 0 deletions
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70
drivers/mmc/core/mmc_ops.c
View file

@ -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)

1
include/linux/mmc/core.h
View file

@ -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