The DMA didn't work properly because the DMA descriptor wasn't properly cleaned after it was used once. Also, the DMA_ENABLE bit was enabled/disabled too late.
Signed-off-by: Marek Vasut marex@denx.de Cc: Wolfgang Denk wd@denx.de Cc: Stefano Babic sbabic@denx.de Cc: Fabio Estevam festevam@freescale.com Cc: Andy Fleming afleming@freescale.com --- drivers/mmc/mxsmmc.c | 34 +++++++++++++++++++--------------- 1 file changed, 19 insertions(+), 15 deletions(-)
diff --git a/drivers/mmc/mxsmmc.c b/drivers/mmc/mxsmmc.c index 52f16f5..d196a50 100644 --- a/drivers/mmc/mxsmmc.c +++ b/drivers/mmc/mxsmmc.c @@ -97,6 +97,10 @@ static int mxsmmc_send_cmd_dma(struct mxsmmc_priv *priv, struct mmc_data *data) uint32_t data_count = data->blocksize * data->blocks; uint32_t cache_data_count; int dmach; + struct mxs_dma_desc *desc = priv->desc; + + memset(desc, 0, sizeof(struct mxs_dma_desc)); + desc->address = (dma_addr_t)desc;
if (data_count % ARCH_DMA_MINALIGN) cache_data_count = roundup(data_count, ARCH_DMA_MINALIGN); @@ -118,7 +122,6 @@ static int mxsmmc_send_cmd_dma(struct mxsmmc_priv *priv, struct mmc_data *data) priv->desc->cmd.data |= MXS_DMA_DESC_IRQ | MXS_DMA_DESC_DEC_SEM | (data_count << MXS_DMA_DESC_BYTES_OFFSET);
- dmach = MXS_DMA_CHANNEL_AHB_APBH_SSP0 + priv->id; mxs_dma_desc_append(dmach, priv->desc); if (mxs_dma_go(dmach)) @@ -183,6 +186,11 @@ mxsmmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data) if (cmd->resp_type & MMC_RSP_136) /* It's a 136 bits response */ ctrl0 |= SSP_CTRL0_LONG_RESP;
+ if (data && (data->blocksize * data->blocks < MXSMMC_SMALL_TRANSFER)) + writel(SSP_CTRL1_DMA_ENABLE, &ssp_regs->hw_ssp_ctrl1_clr); + else + writel(SSP_CTRL1_DMA_ENABLE, &ssp_regs->hw_ssp_ctrl1_set); + /* Command index */ reg = readl(&ssp_regs->hw_ssp_cmd0); reg &= ~(SSP_CMD0_CMD_MASK | SSP_CMD0_APPEND_8CYC); @@ -264,17 +272,6 @@ mxsmmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data) return 0;
if (data->blocksize * data->blocks < MXSMMC_SMALL_TRANSFER) { - writel(SSP_CTRL1_DMA_ENABLE, &ssp_regs->hw_ssp_ctrl1_set); - - ret = mxsmmc_send_cmd_dma(priv, data); - if (ret) { - printf("MMC%d: DMA transfer failed\n", - mmc->block_dev.dev); - return ret; - } - } else { - writel(SSP_CTRL1_DMA_ENABLE, &ssp_regs->hw_ssp_ctrl1_clr); - ret = mxsmmc_send_cmd_pio(priv, data); if (ret) { printf("MMC%d: Data timeout with command %d " @@ -282,6 +279,13 @@ mxsmmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data) mmc->block_dev.dev, cmd->cmdidx, reg); return ret; } + } else { + ret = mxsmmc_send_cmd_dma(priv, data); + if (ret) { + printf("MMC%d: DMA transfer failed\n", + mmc->block_dev.dev); + return ret; + } }
/* Check data errors */ @@ -336,9 +340,9 @@ static int mxsmmc_init(struct mmc *mmc)
/* 8 bits word length in MMC mode */ clrsetbits_le32(&ssp_regs->hw_ssp_ctrl1, - SSP_CTRL1_SSP_MODE_MASK | SSP_CTRL1_WORD_LENGTH_MASK, - SSP_CTRL1_SSP_MODE_SD_MMC | SSP_CTRL1_WORD_LENGTH_EIGHT_BITS | - SSP_CTRL1_DMA_ENABLE); + SSP_CTRL1_SSP_MODE_MASK | SSP_CTRL1_WORD_LENGTH_MASK | + SSP_CTRL1_DMA_ENABLE, + SSP_CTRL1_SSP_MODE_SD_MMC | SSP_CTRL1_WORD_LENGTH_EIGHT_BITS);
/* Set initial bit clock 400 KHz */ mx28_set_ssp_busclock(priv->id, 400);