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mmc: checking status after commands with R1b response

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It is recommended to check card status after these kind of commands.
This is done using CMD13 (SEND_STATUS) JEDEC command until
the card is ready.
In case of error the card status field is displayed.

Signed-off-by: Raffaele Recalcati <raffaele.recalcati@bticino.it>
Signed-off-by: Andy Fleming <afleming@freescale.com>
This commit is contained in:
Raffaele Recalcati 2011-03-11 02:01:12 +00:00 committed by Andy Fleming
parent 8baf939c2c
commit 5d4fc8d907
2 changed files with 63 additions and 3 deletions
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62
drivers/mmc/mmc.c
View file

@ -52,6 +52,42 @@ int mmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
return mmc->send_cmd(mmc, cmd, data);
}
int mmc_send_status(struct mmc *mmc, int timeout)
{
struct mmc_cmd cmd;
int err;
#ifdef CONFIG_MMC_TRACE
int status;
#endif
cmd.cmdidx = MMC_CMD_SEND_STATUS;
cmd.resp_type = MMC_RSP_R1;
cmd.cmdarg = 0;
cmd.flags = 0;
do {
err = mmc_send_cmd(mmc, &cmd, NULL);
if (err)
return err;
else if (cmd.response[0] & MMC_STATUS_RDY_FOR_DATA)
break;
udelay(1000);
if (cmd.response[0] & MMC_STATUS_MASK) {
printf("Status Error: 0x%08X\n", cmd.response[0]);
return COMM_ERR;
}
} while (timeout--);
if (!timeout) {
printf("Timeout waiting card ready\n");
return TIMEOUT;
}
return 0;
}
int mmc_set_blocklen(struct mmc *mmc, int len)
{
struct mmc_cmd cmd;
@ -86,6 +122,7 @@ mmc_write_blocks(struct mmc *mmc, ulong start, lbaint_t blkcnt, const void*src)
{
struct mmc_cmd cmd;
struct mmc_data data;
int timeout = 1000;
if ((start + blkcnt) > mmc->block_dev.lba) {
printf("MMC: block number 0x%lx exceeds max(0x%lx)\n",
@ -128,6 +165,9 @@ mmc_write_blocks(struct mmc *mmc, ulong start, lbaint_t blkcnt, const void*src)
printf("mmc fail to send stop cmd\n");
return 0;
}
/* Waiting for the ready status */
mmc_send_status(mmc, timeout);
}
return blkcnt;
@ -162,6 +202,7 @@ int mmc_read_blocks(struct mmc *mmc, void *dst, ulong start, lbaint_t blkcnt)
{
struct mmc_cmd cmd;
struct mmc_data data;
int timeout = 1000;
if (blkcnt > 1)
cmd.cmdidx = MMC_CMD_READ_MULTIPLE_BLOCK;
@ -193,6 +234,9 @@ int mmc_read_blocks(struct mmc *mmc, void *dst, ulong start, lbaint_t blkcnt)
printf("mmc fail to send stop cmd\n");
return 0;
}
/* Waiting for the ready status */
mmc_send_status(mmc, timeout);
}
return blkcnt;
@ -396,15 +440,23 @@ int mmc_send_ext_csd(struct mmc *mmc, char *ext_csd)
int mmc_switch(struct mmc *mmc, u8 set, u8 index, u8 value)
{
struct mmc_cmd cmd;
int timeout = 1000;
int ret;
cmd.cmdidx = MMC_CMD_SWITCH;
cmd.resp_type = MMC_RSP_R1b;
cmd.cmdarg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
(index << 16) |
(value << 8);
(index << 16) |
(value << 8);
cmd.flags = 0;
return mmc_send_cmd(mmc, &cmd, NULL);
ret = mmc_send_cmd(mmc, &cmd, NULL);
/* Waiting for the ready status */
mmc_send_status(mmc, timeout);
return ret;
}
int mmc_change_freq(struct mmc *mmc)
@ -643,6 +695,7 @@ int mmc_startup(struct mmc *mmc)
u64 cmult, csize;
struct mmc_cmd cmd;
char ext_csd[512];
int timeout = 1000;
#ifdef CONFIG_MMC_SPI_CRC_ON
if (mmc_host_is_spi(mmc)) { /* enable CRC check for spi */
@ -699,6 +752,9 @@ int mmc_startup(struct mmc *mmc)
err = mmc_send_cmd(mmc, &cmd, NULL);
/* Waiting for the ready status */
mmc_send_status(mmc, timeout);
if (err)
return err;

4
include/mmc.h
View file

@ -97,6 +97,10 @@
#define OCR_BUSY 0x80000000
#define OCR_HCS 0x40000000
#define MMC_STATUS_MASK (~0x0206BF7F)
#define MMC_STATUS_RDY_FOR_DATA (1<<8)
#define MMC_STATUS_CURR_STATE (0xf<<9)
#define MMC_VDD_165_195 0x00000080 /* VDD voltage 1.65 - 1.95 */
#define MMC_VDD_20_21 0x00000100 /* VDD voltage 2.0 ~ 2.1 */
#define MMC_VDD_21_22 0x00000200 /* VDD voltage 2.1 ~ 2.2 */