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path: root/drivers/mmc/mvebu_mmc.c
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Diffstat (limited to 'drivers/mmc/mvebu_mmc.c')
-rw-r--r--drivers/mmc/mvebu_mmc.c103
1 files changed, 60 insertions, 43 deletions
diff --git a/drivers/mmc/mvebu_mmc.c b/drivers/mmc/mvebu_mmc.c
index 9f98c3f..8ca0904 100644
--- a/drivers/mmc/mvebu_mmc.c
+++ b/drivers/mmc/mvebu_mmc.c
@@ -1,7 +1,7 @@
/*
* Marvell MMC/SD/SDIO driver
*
- * (C) Copyright 2012
+ * (C) Copyright 2012-2014
* Marvell Semiconductor <www.marvell.com>
* Written-by: Maen Suleiman, Gerald Kerma
*
@@ -23,6 +23,8 @@ DECLARE_GLOBAL_DATA_PTR;
#define MVEBU_TARGET_DRAM 0
+#define TIMEOUT_DELAY 5*CONFIG_SYS_HZ /* wait 5 seconds */
+
static void mvebu_mmc_write(u32 offs, u32 val)
{
writel(val, CONFIG_SYS_MMC_BASE + (offs));
@@ -63,37 +65,47 @@ static int mvebu_mmc_setup_data(struct mmc_data *data)
static int mvebu_mmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd,
struct mmc_data *data)
{
- int timeout = 10;
+ ulong start;
ushort waittype = 0;
ushort resptype = 0;
ushort xfertype = 0;
ushort resp_indx = 0;
- debug("cmdidx [0x%x] resp_type[0x%x] cmdarg[0x%x]\n",
- cmd->cmdidx, cmd->resp_type, cmd->cmdarg);
-
- udelay(10*1000);
+ debug("%s: cmdidx [0x%x] resp_type[0x%x] cmdarg[0x%x]\n",
+ DRIVER_NAME, cmd->cmdidx, cmd->resp_type, cmd->cmdarg);
debug("%s: cmd %d (hw state 0x%04x)\n", DRIVER_NAME,
cmd->cmdidx, mvebu_mmc_read(SDIO_HW_STATE));
- /* Checking if card is busy */
- while ((mvebu_mmc_read(SDIO_HW_STATE) & CARD_BUSY)) {
- if (timeout == 0) {
- printf("%s: card busy!\n", DRIVER_NAME);
- return -1;
- }
- timeout--;
- udelay(1000);
+ /*
+ * Hardware weirdness. The FIFO_EMPTY bit of the HW_STATE
+ * register is sometimes not set before a while when some
+ * "unusual" data block sizes are used (such as with the SWITCH
+ * command), even despite the fact that the XFER_DONE interrupt
+ * was raised. And if another data transfer starts before
+ * this bit comes to good sense (which eventually happens by
+ * itself) then the new transfer simply fails with a timeout.
+ */
+ if (!(mvebu_mmc_read(SDIO_HW_STATE) & CMD_FIFO_EMPTY)) {
+ ushort hw_state, count = 0;
+
+ start = get_timer(0);
+ do {
+ hw_state = mvebu_mmc_read(SDIO_HW_STATE);
+ if ((get_timer(0) - start) > TIMEOUT_DELAY) {
+ printf("%s : FIFO_EMPTY bit missing\n",
+ DRIVER_NAME);
+ break;
+ }
+ count++;
+ } while (!(hw_state & CMD_FIFO_EMPTY));
+ debug("%s *** wait for FIFO_EMPTY bit (hw=0x%04x, count=%d, jiffies=%ld)\n",
+ DRIVER_NAME, hw_state, count, (get_timer(0) - (start)));
}
- /* Set up for a data transfer if we have one */
- if (data) {
- int err = mvebu_mmc_setup_data(data);
-
- if (err)
- return err;
- }
+ /* Clear status */
+ mvebu_mmc_write(SDIO_NOR_INTR_STATUS, SDIO_POLL_MASK);
+ mvebu_mmc_write(SDIO_ERR_INTR_STATUS, SDIO_POLL_MASK);
resptype = SDIO_CMD_INDEX(cmd->cmdidx);
@@ -119,6 +131,14 @@ static int mvebu_mmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd,
}
if (data) {
+ int err = mvebu_mmc_setup_data(data);
+
+ if (err) {
+ debug("%s: command DATA error :%x\n",
+ DRIVER_NAME, err);
+ return err;
+ }
+
resptype |= SDIO_CMD_DATA_PRESENT | SDIO_CMD_CHECK_DATACRC16;
xfertype |= SDIO_XFER_MODE_HW_WR_DATA_EN;
if (data->flags & MMC_DATA_READ) {
@@ -138,17 +158,10 @@ static int mvebu_mmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd,
/* Setting Xfer mode */
mvebu_mmc_write(SDIO_XFER_MODE, xfertype);
- mvebu_mmc_write(SDIO_NOR_INTR_STATUS, ~SDIO_NOR_CARD_INT);
- mvebu_mmc_write(SDIO_ERR_INTR_STATUS, SDIO_POLL_MASK);
-
/* Sending command */
mvebu_mmc_write(SDIO_CMD, resptype);
- mvebu_mmc_write(SDIO_NOR_INTR_EN, SDIO_POLL_MASK);
- mvebu_mmc_write(SDIO_ERR_INTR_EN, SDIO_POLL_MASK);
-
- /* Waiting for completion */
- timeout = 1000000;
+ start = get_timer(0);
while (!((mvebu_mmc_read(SDIO_NOR_INTR_STATUS)) & waittype)) {
if (mvebu_mmc_read(SDIO_NOR_INTR_STATUS) & SDIO_NOR_ERROR) {
@@ -156,21 +169,20 @@ static int mvebu_mmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd,
DRIVER_NAME, cmd->cmdidx,
mvebu_mmc_read(SDIO_ERR_INTR_STATUS));
if (mvebu_mmc_read(SDIO_ERR_INTR_STATUS) &
- (SDIO_ERR_CMD_TIMEOUT | SDIO_ERR_DATA_TIMEOUT))
+ (SDIO_ERR_CMD_TIMEOUT | SDIO_ERR_DATA_TIMEOUT)) {
+ debug("%s: command READ timed out\n",
+ DRIVER_NAME);
return TIMEOUT;
+ }
+ debug("%s: command READ error\n", DRIVER_NAME);
return COMM_ERR;
}
- timeout--;
- udelay(1);
- if (timeout <= 0) {
- printf("%s: command timed out\n", DRIVER_NAME);
+ if ((get_timer(0) - start) > TIMEOUT_DELAY) {
+ debug("%s: command timed out\n", DRIVER_NAME);
return TIMEOUT;
}
}
- if (mvebu_mmc_read(SDIO_ERR_INTR_STATUS) &
- (SDIO_ERR_CMD_TIMEOUT | SDIO_ERR_DATA_TIMEOUT))
- return TIMEOUT;
/* Handling response */
if (cmd->resp_type & MMC_RSP_136) {
@@ -204,6 +216,11 @@ static int mvebu_mmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd,
cmd->response[1] = ((response[0] & 0xfc00) >> 10);
cmd->response[2] = 0;
cmd->response[3] = 0;
+ } else {
+ cmd->response[0] = 0;
+ cmd->response[1] = 0;
+ cmd->response[2] = 0;
+ cmd->response[3] = 0;
}
debug("%s: resp[0x%x] ", DRIVER_NAME, cmd->resp_type);
@@ -213,6 +230,10 @@ static int mvebu_mmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd,
debug("[0x%x] ", cmd->response[3]);
debug("\n");
+ if (mvebu_mmc_read(SDIO_ERR_INTR_STATUS) &
+ (SDIO_ERR_CMD_TIMEOUT | SDIO_ERR_DATA_TIMEOUT))
+ return TIMEOUT;
+
return 0;
}
@@ -251,9 +272,8 @@ static void mvebu_mmc_set_clk(unsigned int clock)
if (m > MVEBU_MMC_BASE_DIV_MAX)
m = MVEBU_MMC_BASE_DIV_MAX;
mvebu_mmc_write(SDIO_CLK_DIV, m & MVEBU_MMC_BASE_DIV_MAX);
+ debug("%s: clock (%d) div : %d\n", DRIVER_NAME, clock, m);
}
-
- udelay(10*1000);
}
static void mvebu_mmc_set_bus(unsigned int bus)
@@ -293,7 +313,6 @@ static void mvebu_mmc_set_bus(unsigned int bus)
"high-speed" : "");
mvebu_mmc_write(SDIO_HOST_CTRL, ctrl_reg);
- udelay(10*1000);
}
static void mvebu_mmc_set_ios(struct mmc *mmc)
@@ -355,7 +374,7 @@ static void mvebu_window_setup(void)
static int mvebu_mmc_initialize(struct mmc *mmc)
{
- debug("%s: mvebu_mmc_initialize", DRIVER_NAME);
+ debug("%s: mvebu_mmc_initialize\n", DRIVER_NAME);
/*
* Setting host parameters
@@ -384,8 +403,6 @@ static int mvebu_mmc_initialize(struct mmc *mmc)
/* SW reset */
mvebu_mmc_write(SDIO_SW_RESET, SDIO_SW_RESET_NOW);
- udelay(10*1000);
-
return 0;
}
generated by cgit v1.1 at 2024-12-24 22:55:24 +0000