#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.
- */
+#include <bouncebuf.h>
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;
};
#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;
+ int dmach;
+ struct mxs_dma_desc *desc = priv->desc;
+ void *addr;
+ unsigned int flags;
+ struct bounce_buffer bbstate;
+
+ memset(desc, 0, sizeof(struct mxs_dma_desc));
+ desc->address = (dma_addr_t)desc;
+
+ if (data->flags & MMC_DATA_READ) {
+ priv->desc->cmd.data = MXS_DMA_DESC_COMMAND_DMA_WRITE;
+ addr = data->dest;
+ flags = GEN_BB_WRITE;
+ } else {
+ priv->desc->cmd.data = MXS_DMA_DESC_COMMAND_DMA_READ;
+ addr = (void *)data->src;
+ flags = GEN_BB_READ;
+ }
+
+ bounce_buffer_start(&bbstate, addr, data_count, flags);
+
+ priv->desc->cmd.address = (dma_addr_t)bbstate.bounce_buffer;
+
+ 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)) {
+ bounce_buffer_stop(&bbstate);
+ return COMM_ERR;
+ }
+
+ bounce_buffer_stop(&bbstate);
+
+ return 0;
+}
/*
* Sends a command out on the bus. Takes the mmc pointer,
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;
const uint32_t busy_stat = SSP_STATUS_BUSY | SSP_STATUS_DATA_BUSY |
SSP_STATUS_CMD_BUSY;
-#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);
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);
if (!data)
return 0;
- data_count = data->blocksize * data->blocks;
- timeout = get_timer(0);
-
-#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) {
- 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 = get_timer(0);
- } else if ((get_timer(timeout) > MXSMMC_MAX_TIMEOUT) &&
- (readl(&ssp_regs->hw_ssp_status) & SSP_STATUS_FIFO_EMPTY)) {
- break;
- }
+ 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;
- while (data_count) {
- 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 = get_timer(0);
- } else if ((get_timer(timeout) > MXSMMC_MAX_TIMEOUT * 100) &&
- (readl(&ssp_regs->hw_ssp_status) & SSP_STATUS_FIFO_FULL)) {
- break;
- }
+ ret = mxsmmc_send_cmd_dma(priv, data);
+ if (ret) {
+ printf("MMC%d: DMA transfer failed\n",
+ mmc->block_dev.dev);
+ return ret;
}
}
- if (data_count) {
- 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 &
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)
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);
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;
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;
mmc->host_caps = MMC_MODE_4BIT | MMC_MODE_8BIT |
MMC_MODE_HS_52MHz | MMC_MODE_HS;
+ /*
+ * SSPCLK = 480 * 18 / 29 / 1 = 297.731 MHz
+ * SSP bit rate = SSPCLK / (CLOCK_DIVIDE * (1 + CLOCK_RATE)),
+ * CLOCK_DIVIDE has to be an even value from 2 to 254, and
+ * CLOCK_RATE could be any integer from 0 to 255.
+ */
mmc->f_min = 400000;
mmc->f_max = mxc_get_clock(MXC_SSP0_CLK + id) * 1000 / 2;
- mmc->b_max = 0x40;
+ mmc->b_max = 0x20;
mmc_register(mmc);
return 0;
projects / karo-tx-uboot.git / blobdiff