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-rw-r--r--drivers/mmc/fsl_esdhc.c87
1 files changed, 85 insertions, 2 deletions
diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c
index 0f6f8b1..a9b07a9 100644
--- a/drivers/mmc/fsl_esdhc.c
+++ b/drivers/mmc/fsl_esdhc.c
@@ -72,8 +72,10 @@ uint esdhc_xfertyp(struct mmc_cmd *cmd, struct mmc_data *data)
uint xfertyp = 0;
if (data) {
- xfertyp |= XFERTYP_DPSEL | XFERTYP_DMAEN;
-
+ xfertyp |= XFERTYP_DPSEL;
+#ifndef CONFIG_SYS_FSL_ESDHC_USE_PIO
+ xfertyp |= XFERTYP_DMAEN;
+#endif
if (data->blocks > 1) {
xfertyp |= XFERTYP_MSBSEL;
xfertyp |= XFERTYP_BCEN;
@@ -97,6 +99,71 @@ uint esdhc_xfertyp(struct mmc_cmd *cmd, struct mmc_data *data)
return XFERTYP_CMD(cmd->cmdidx) | xfertyp;
}
+#ifdef CONFIG_SYS_FSL_ESDHC_USE_PIO
+/*
+ * PIO Read/Write Mode reduce the performace as DMA is not used in this mode.
+ */
+static int
+esdhc_pio_read_write(struct mmc *mmc, struct mmc_data *data)
+{
+ struct fsl_esdhc *regs = mmc->priv;
+ uint blocks;
+ char *buffer;
+ uint databuf;
+ uint size;
+ uint irqstat;
+ uint timeout;
+
+ if (data->flags & MMC_DATA_READ) {
+ blocks = data->blocks;
+ buffer = data->dest;
+ while (blocks) {
+ timeout = PIO_TIMEOUT;
+ size = data->blocksize;
+ irqstat = esdhc_read32(&regs->irqstat);
+ while (!(esdhc_read32(&regs->prsstat) & PRSSTAT_BREN)
+ && --timeout);
+ if (timeout <= 0) {
+ printf("\nData Read Failed in PIO Mode.");
+ return timeout;
+ }
+ while (size && (!(irqstat & IRQSTAT_TC))) {
+ udelay(100); /* Wait before last byte transfer complete */
+ irqstat = esdhc_read32(&regs->irqstat);
+ databuf = in_le32(&regs->datport);
+ *((uint *)buffer) = databuf;
+ buffer += 4;
+ size -= 4;
+ }
+ blocks--;
+ }
+ } else {
+ blocks = data->blocks;
+ buffer = data->src;
+ while (blocks) {
+ timeout = PIO_TIMEOUT;
+ size = data->blocksize;
+ irqstat = esdhc_read32(&regs->irqstat);
+ while (!(esdhc_read32(&regs->prsstat) & PRSSTAT_BWEN)
+ && --timeout);
+ if (timeout <= 0) {
+ printf("\nData Write Failed in PIO Mode.");
+ return timeout;
+ }
+ while (size && (!(irqstat & IRQSTAT_TC))) {
+ udelay(100); /* Wait before last byte transfer complete */
+ databuf = *((uint *)buffer);
+ buffer += 4;
+ size -= 4;
+ irqstat = esdhc_read32(&regs->irqstat);
+ out_le32(&regs->datport, databuf);
+ }
+ blocks--;
+ }
+ }
+}
+#endif
+
static int esdhc_setup_data(struct mmc *mmc, struct mmc_data *data)
{
uint wml_value;
@@ -104,6 +171,17 @@ static int esdhc_setup_data(struct mmc *mmc, struct mmc_data *data)
struct fsl_esdhc_cfg *cfg = (struct fsl_esdhc_cfg *)mmc->priv;
struct fsl_esdhc *regs = (struct fsl_esdhc *)cfg->esdhc_base;
+#ifdef CONFIG_SYS_FSL_ESDHC_USE_PIO
+ if (!(data->flags & MMC_DATA_READ)) {
+ if ((esdhc_read32(&regs->prsstat) & PRSSTAT_WPSPL) == 0) {
+ printf("\nThe SD card is locked. "
+ "Can not write to a locked card.\n\n");
+ return TIMEOUT;
+ }
+ esdhc_write32(&regs->dsaddr, (u32)data->src);
+ } else
+ esdhc_write32(&regs->dsaddr, (u32)data->dest);
+#else
wml_value = data->blocksize/4;
if (data->flags & MMC_DATA_READ) {
@@ -124,6 +202,7 @@ static int esdhc_setup_data(struct mmc *mmc, struct mmc_data *data)
wml_value << 16);
esdhc_write32(&regs->dsaddr, (u32)data->src);
}
+#endif
esdhc_write32(&regs->blkattr, data->blocks << 16 | data->blocksize);
@@ -220,6 +299,9 @@ esdhc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
/* Wait until all of the blocks are transferred */
if (data) {
+#ifdef CONFIG_SYS_FSL_ESDHC_USE_PIO
+ esdhc_pio_read_write(mmc, data);
+#else
do {
irqstat = esdhc_read32(&regs->irqstat);
@@ -230,6 +312,7 @@ esdhc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
return TIMEOUT;
} while (!(irqstat & IRQSTAT_TC) &&
(esdhc_read32(&regs->prsstat) & PRSSTAT_DLA));
+#endif
}
esdhc_write32(&regs->irqstat, -1);