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-rw-r--r--drivers/mmc/mxsmmc.c48
1 files changed, 47 insertions, 1 deletions
diff --git a/drivers/mmc/mxsmmc.c b/drivers/mmc/mxsmmc.c
index e8bad9d..dfceaef 100644
--- a/drivers/mmc/mxsmmc.c
+++ b/drivers/mmc/mxsmmc.c
@@ -43,6 +43,13 @@
#include <asm/arch/sys_proto.h>
#include <asm/arch/dma.h>
+/*
+ * CONFIG_MXS_MMC_DMA: This feature is highly experimental and has no
+ * performance benefit unless you operate the platform with
+ * data cache enabled. This is disabled by default, enable
+ * only if you know what you're doing.
+ */
+
struct mxsmmc_priv {
int id;
struct mx28_ssp_regs *regs;
@@ -66,8 +73,13 @@ mxsmmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
struct mx28_ssp_regs *ssp_regs = priv->regs;
uint32_t reg;
int timeout;
- uint32_t data_count, cache_data_count;
+ uint32_t data_count;
uint32_t ctrl0;
+#ifndef CONFIG_MXS_MMC_DMA
+ uint32_t *data_ptr;
+#else
+ uint32_t cache_data_count;
+#endif
debug("MMC%d: CMD%d\n", mmc->block_dev.dev, cmd->cmdidx);
@@ -185,7 +197,9 @@ mxsmmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
return 0;
data_count = data->blocksize * data->blocks;
+ timeout = MXSMMC_MAX_TIMEOUT;
+#ifdef CONFIG_MXS_MMC_DMA
if (data_count % ARCH_DMA_MINALIGN)
cache_data_count = roundup(data_count, ARCH_DMA_MINALIGN);
else
@@ -218,6 +232,38 @@ mxsmmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
invalidate_dcache_range((uint32_t)priv->desc->cmd.address,
(uint32_t)(priv->desc->cmd.address + cache_data_count));
}
+#else
+ if (data->flags & MMC_DATA_READ) {
+ data_ptr = (uint32_t *)data->dest;
+ while (data_count && --timeout) {
+ reg = readl(&ssp_regs->hw_ssp_status);
+ if (!(reg & SSP_STATUS_FIFO_EMPTY)) {
+ *data_ptr++ = readl(&ssp_regs->hw_ssp_data);
+ data_count -= 4;
+ timeout = MXSMMC_MAX_TIMEOUT;
+ } else
+ udelay(1000);
+ }
+ } else {
+ data_ptr = (uint32_t *)data->src;
+ timeout *= 100;
+ while (data_count && --timeout) {
+ reg = readl(&ssp_regs->hw_ssp_status);
+ if (!(reg & SSP_STATUS_FIFO_FULL)) {
+ writel(*data_ptr++, &ssp_regs->hw_ssp_data);
+ data_count -= 4;
+ timeout = MXSMMC_MAX_TIMEOUT;
+ } else
+ udelay(1000);
+ }
+ }
+
+ if (!timeout) {
+ printf("MMC%d: Data timeout with command %d (status 0x%08x)!\n",
+ mmc->block_dev.dev, cmd->cmdidx, reg);
+ return COMM_ERR;
+ }
+#endif
/* Check data errors */
reg = readl(&ssp_regs->hw_ssp_status);