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path: root/drivers/mmc/mxsmmc.c
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Diffstat (limited to 'drivers/mmc/mxsmmc.c')
-rw-r--r--drivers/mmc/mxsmmc.c204
1 files changed, 113 insertions, 91 deletions
diff --git a/drivers/mmc/mxsmmc.c b/drivers/mmc/mxsmmc.c
index 4187a9412..9a98c6b85 100644
--- a/drivers/mmc/mxsmmc.c
+++ b/drivers/mmc/mxsmmc.c
@@ -43,16 +43,9 @@
#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;
+ struct mxs_ssp_regs *regs;
uint32_t clkseq_bypass;
uint32_t *clkctrl_ssp;
uint32_t buswidth;
@@ -61,6 +54,87 @@ struct mxsmmc_priv {
};
#define MXSMMC_MAX_TIMEOUT 10000
+#define MXSMMC_SMALL_TRANSFER 512
+
+static int mxsmmc_send_cmd_pio(struct mxsmmc_priv *priv, struct mmc_data *data)
+{
+ struct mxs_ssp_regs *ssp_regs = priv->regs;
+ uint32_t *data_ptr;
+ int timeout = MXSMMC_MAX_TIMEOUT;
+ uint32_t reg;
+ uint32_t data_count = data->blocksize * data->blocks;
+
+ 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);
+ }
+ }
+
+ return timeout ? 0 : COMM_ERR;
+}
+
+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);
+ else
+ cache_data_count = data_count;
+
+ if (data->flags & MMC_DATA_READ) {
+ priv->desc->cmd.data = MXS_DMA_DESC_COMMAND_DMA_WRITE;
+ priv->desc->cmd.address = (dma_addr_t)data->dest;
+ } else {
+ priv->desc->cmd.data = MXS_DMA_DESC_COMMAND_DMA_READ;
+ priv->desc->cmd.address = (dma_addr_t)data->src;
+
+ /* Flush data to DRAM so DMA can pick them up */
+ flush_dcache_range((uint32_t)priv->desc->cmd.address,
+ (uint32_t)(priv->desc->cmd.address + cache_data_count));
+ }
+
+ 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))
+ return COMM_ERR;
+
+ /* The data arrived into DRAM, invalidate cache over them */
+ if (data->flags & MMC_DATA_READ) {
+ invalidate_dcache_range((uint32_t)priv->desc->cmd.address,
+ (uint32_t)(priv->desc->cmd.address + cache_data_count));
+ }
+
+ return 0;
+}
/*
* Sends a command out on the bus. Takes the mmc pointer,
@@ -70,16 +144,11 @@ static int
mxsmmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
{
struct mxsmmc_priv *priv = (struct mxsmmc_priv *)mmc->priv;
- struct mx28_ssp_regs *ssp_regs = priv->regs;
+ struct mxs_ssp_regs *ssp_regs = priv->regs;
uint32_t reg;
int timeout;
- uint32_t data_count;
uint32_t ctrl0;
-#ifndef CONFIG_MXS_MMC_DMA
- uint32_t *data_ptr;
-#else
- uint32_t cache_data_count;
-#endif
+ int ret;
debug("MMC%d: CMD%d\n", mmc->block_dev.dev, cmd->cmdidx);
@@ -117,6 +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);
@@ -197,75 +271,23 @@ mxsmmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
if (!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
- cache_data_count = data_count;
-
- if (data->flags & MMC_DATA_READ) {
- priv->desc->cmd.data = MXS_DMA_DESC_COMMAND_DMA_WRITE;
- priv->desc->cmd.address = (dma_addr_t)data->dest;
- } else {
- priv->desc->cmd.data = MXS_DMA_DESC_COMMAND_DMA_READ;
- priv->desc->cmd.address = (dma_addr_t)data->src;
-
- /* Flush data to DRAM so DMA can pick them up */
- flush_dcache_range((uint32_t)priv->desc->cmd.address,
- (uint32_t)(priv->desc->cmd.address + cache_data_count));
- }
-
- priv->desc->cmd.data |= MXS_DMA_DESC_IRQ | MXS_DMA_DESC_DEC_SEM |
- (data_count << MXS_DMA_DESC_BYTES_OFFSET);
-
-
- mxs_dma_desc_append(MXS_DMA_CHANNEL_AHB_APBH_SSP0, priv->desc);
- if (mxs_dma_go(MXS_DMA_CHANNEL_AHB_APBH_SSP0)) {
- printf("MMC%d: DMA transfer failed\n", mmc->block_dev.dev);
- return COMM_ERR;
- }
-
- /* The data arrived into DRAM, invalidate cache over them */
- if (data->flags & MMC_DATA_READ) {
- 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);
+ if (data->blocksize * data->blocks < MXSMMC_SMALL_TRANSFER) {
+ ret = mxsmmc_send_cmd_pio(priv, data);
+ if (ret) {
+ printf("MMC%d: Data timeout with command %d "
+ "(status 0x%08x)!\n",
+ mmc->block_dev.dev, cmd->cmdidx, reg);
+ return ret;
}
} 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);
+ ret = mxsmmc_send_cmd_dma(priv, data);
+ if (ret) {
+ printf("MMC%d: DMA transfer failed\n",
+ mmc->block_dev.dev);
+ return ret;
}
}
- 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);
if (reg &
@@ -282,7 +304,7 @@ mxsmmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
static void mxsmmc_set_ios(struct mmc *mmc)
{
struct mxsmmc_priv *priv = (struct mxsmmc_priv *)mmc->priv;
- struct mx28_ssp_regs *ssp_regs = priv->regs;
+ struct mxs_ssp_regs *ssp_regs = priv->regs;
/* Set the clock speed */
if (mmc->clock)
@@ -311,16 +333,16 @@ static void mxsmmc_set_ios(struct mmc *mmc)
static int mxsmmc_init(struct mmc *mmc)
{
struct mxsmmc_priv *priv = (struct mxsmmc_priv *)mmc->priv;
- struct mx28_ssp_regs *ssp_regs = priv->regs;
+ struct mxs_ssp_regs *ssp_regs = priv->regs;
/* Reset SSP */
- mx28_reset_block(&ssp_regs->hw_ssp_ctrl0_reg);
+ mxs_reset_block(&ssp_regs->hw_ssp_ctrl0_reg);
/* 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);
@@ -335,8 +357,8 @@ static int mxsmmc_init(struct mmc *mmc)
int mxsmmc_initialize(bd_t *bis, int id, int (*wp)(int))
{
- struct mx28_clkctrl_regs *clkctrl_regs =
- (struct mx28_clkctrl_regs *)MXS_CLKCTRL_BASE;
+ struct mxs_clkctrl_regs *clkctrl_regs =
+ (struct mxs_clkctrl_regs *)MXS_CLKCTRL_BASE;
struct mmc *mmc = NULL;
struct mxsmmc_priv *priv = NULL;
int ret;
@@ -366,22 +388,22 @@ int mxsmmc_initialize(bd_t *bis, int id, int (*wp)(int))
priv->id = id;
switch (id) {
case 0:
- priv->regs = (struct mx28_ssp_regs *)MXS_SSP0_BASE;
+ priv->regs = (struct mxs_ssp_regs *)MXS_SSP0_BASE;
priv->clkseq_bypass = CLKCTRL_CLKSEQ_BYPASS_SSP0;
priv->clkctrl_ssp = &clkctrl_regs->hw_clkctrl_ssp0;
break;
case 1:
- priv->regs = (struct mx28_ssp_regs *)MXS_SSP1_BASE;
+ priv->regs = (struct mxs_ssp_regs *)MXS_SSP1_BASE;
priv->clkseq_bypass = CLKCTRL_CLKSEQ_BYPASS_SSP1;
priv->clkctrl_ssp = &clkctrl_regs->hw_clkctrl_ssp1;
break;
case 2:
- priv->regs = (struct mx28_ssp_regs *)MXS_SSP2_BASE;
+ priv->regs = (struct mxs_ssp_regs *)MXS_SSP2_BASE;
priv->clkseq_bypass = CLKCTRL_CLKSEQ_BYPASS_SSP2;
priv->clkctrl_ssp = &clkctrl_regs->hw_clkctrl_ssp2;
break;
case 3:
- priv->regs = (struct mx28_ssp_regs *)MXS_SSP3_BASE;
+ priv->regs = (struct mxs_ssp_regs *)MXS_SSP3_BASE;
priv->clkseq_bypass = CLKCTRL_CLKSEQ_BYPASS_SSP3;
priv->clkctrl_ssp = &clkctrl_regs->hw_clkctrl_ssp3;
break;
generated by cgit v1.2.3-70-g09d2 (git 2.51.2) at 2025-10-31 14:00:51 +0000