#include <asm/arch/clock.h>
#include <asm/arch/imx-regs.h>
#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;
uint32_t *clkctrl_ssp;
uint32_t buswidth;
int (*mmc_is_wp)(int);
+ struct mxs_dma_desc *desc;
};
#define MXSMMC_MAX_TIMEOUT 10000
uint32_t reg;
int timeout;
uint32_t data_count;
- uint32_t *data_ptr;
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);
/* READ or WRITE */
if (data->flags & MMC_DATA_READ) {
ctrl0 |= SSP_CTRL0_READ;
- } else if (priv->mmc_is_wp(mmc->block_dev.dev)) {
+ } else if (priv->mmc_is_wp &&
+ priv->mmc_is_wp(mmc->block_dev.dev)) {
printf("MMC%d: Can not write a locked card!\n",
mmc->block_dev.dev);
return UNUSABLE_ERR;
if (!data)
return 0;
- /* Process the data */
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) {
mmc->block_dev.dev, cmd->cmdidx, reg);
return COMM_ERR;
}
+#endif
/* Check data errors */
reg = readl(&ssp_regs->hw_ssp_status);
/* 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_SSP_MODE_SD_MMC | SSP_CTRL1_WORD_LENGTH_EIGHT_BITS |
+ SSP_CTRL1_DMA_ENABLE);
/* Set initial bit clock 400 KHz */
mx28_set_ssp_busclock(priv->id, 400);
(struct mx28_clkctrl_regs *)MXS_CLKCTRL_BASE;
struct mmc *mmc = NULL;
struct mxsmmc_priv *priv = NULL;
+ int ret;
mmc = malloc(sizeof(struct mmc));
if (!mmc)
return -ENOMEM;
}
+ priv->desc = mxs_dma_desc_alloc();
+ if (!priv->desc) {
+ free(priv);
+ free(mmc);
+ return -ENOMEM;
+ }
+
+ ret = mxs_dma_init_channel(id);
+ if (ret)
+ return ret;
+
priv->mmc_is_wp = wp;
priv->id = id;
switch (id) {
mmc->send_cmd = mxsmmc_send_cmd;
mmc->set_ios = mxsmmc_set_ios;
mmc->init = mxsmmc_init;
+ mmc->getcd = NULL;
mmc->priv = priv;
mmc->voltages = MMC_VDD_32_33 | MMC_VDD_33_34;
*/
mmc->f_min = 400000;
mmc->f_max = mxc_get_clock(MXC_SSP0_CLK + id) * 1000 / 2;
- mmc->b_max = 0;
+ mmc->b_max = 0x20;
mmc_register(mmc);
return 0;