From: Raffaele Recalcati <raffaele.recalc...@bticino.it>
It is a recommended to check card status after these kind of commands.
This is done using CMD13 (SEND_STATUS) JEDEC command.
In case of error the card status field is displayed.
Signed-off-by: Raffaele Recalcati <raffaele.recalc...@bticino.it>
---
It is not clear what should nice to do in case of status error.
Maybe it can happen only in case of hw failure.
drivers/mmc/mmc.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++--
include/mmc.h | 4 +++
2 files changed, 57 insertions(+), 3 deletions(-)
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index 6805b33..042653f 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -48,6 +48,36 @@ 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;
+ int status;
+
+ 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);
+ break;
+ 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--);
+
+ return 0;
+}
+
int mmc_set_blocklen(struct mmc *mmc, int len)
{
struct mmc_cmd cmd;
@@ -82,6 +112,7 @@ 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",
@@ -121,6 +152,9 @@ 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, 1000);
}
return blkcnt;
@@ -158,6 +192,7 @@ 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;
@@ -189,6 +224,9 @@ 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, 1000);
}
return blkcnt;
@@ -369,15 +407,23 @@ 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, 1000);
+
+ return ret;
+
}
int mmc_change_freq(struct mmc *mmc)
@@ -610,6 +656,7 @@ int mmc_startup(struct mmc *mmc)
u64 cmult, csize;
struct mmc_cmd cmd;
char ext_csd[512];
+ int timeout = 1000;
/* Put the Card in Identify Mode */
cmd.cmdidx = MMC_CMD_ALL_SEND_CID;
@@ -722,6 +769,9 @@ int mmc_startup(struct mmc *mmc)
cmd.flags = 0;
err = mmc_send_cmd(mmc, &cmd, NULL);
+ /* Waiting for the ready status */
+ mmc_send_status(mmc, 1000);
+
if (err)
return err;
diff --git a/include/mmc.h b/include/mmc.h
index fcd0fd1..4ee8e1c 100644
--- a/include/mmc.h
+++ b/include/mmc.h
@@ -94,6 +94,10 @@
#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 */
--
1.7.0.4
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