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mmc: dw_mmc: support fifo mode in dwc mmc driver 

some soc(rk3036 etc) use dw_mmc but do not have internal dma,
so we implement fifo mode to read and write data.

Signed-off-by: Lin Huang <hl@rock-chips.com>
Acked-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
huang lin 2015-11-17 14:20:22 +08:00 committed by Simon Glass
parent f382eb833a
commit a65f51b978
2 changed files with 71 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

57
drivers/mmc/dw_mmc.c
View File

@ -94,12 +94,21 @@ static void dwmci_prepare_data(struct dwmci_host *host,
dwmci_writel(host, DWMCI_BYTCNT, data->blocksize * data->blocks);
}
static int dwmci_data_transfer(struct dwmci_host *host)
static int dwmci_data_transfer(struct dwmci_host *host, struct mmc_data *data)
{
int ret = 0;
unsigned int timeout = 240000;
u32 mask;
u32 timeout = 240000;
u32 mask, size, i, len = 0;
u32 *buf = NULL;
ulong start = get_timer(0);
u32 fifo_depth = (((host->fifoth_val & RX_WMARK_MASK) >>
RX_WMARK_SHIFT) + 1) * 2;
size = data->blocksize * data->blocks / 4;
if (data->flags == MMC_DATA_READ)
buf = (unsigned int *)data->dest;
else
buf = (unsigned int *)data->src;
for (;;) {
mask = dwmci_readl(host, DWMCI_RINTSTS);
@ -110,6 +119,36 @@ static int dwmci_data_transfer(struct dwmci_host *host)
break;
}
if (host->fifo_mode && size) {
if (data->flags == MMC_DATA_READ) {
if ((dwmci_readl(host, DWMCI_RINTSTS) &&
DWMCI_INTMSK_RXDR)) {
len = dwmci_readl(host, DWMCI_STATUS);
len = (len >> DWMCI_FIFO_SHIFT) &
DWMCI_FIFO_MASK;
for (i = 0; i < len; i++)
*buf++ =
dwmci_readl(host, DWMCI_DATA);
dwmci_writel(host, DWMCI_RINTSTS,
DWMCI_INTMSK_RXDR);
}
} else {
if ((dwmci_readl(host, DWMCI_RINTSTS) &&
DWMCI_INTMSK_TXDR)) {
len = dwmci_readl(host, DWMCI_STATUS);
len = fifo_depth - ((len >>
DWMCI_FIFO_SHIFT) &
DWMCI_FIFO_MASK);
for (i = 0; i < len; i++)
dwmci_writel(host, DWMCI_DATA,
*buf++);
dwmci_writel(host, DWMCI_RINTSTS,
DWMCI_INTMSK_TXDR);
}
}
size = size > len ? (size - len) : 0;
}
/* Data arrived correctly. */
if (mask & DWMCI_INTMSK_DTO) {
ret = 0;
@ -165,6 +204,12 @@ static int dwmci_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd,
dwmci_writel(host, DWMCI_RINTSTS, DWMCI_INTMSK_ALL);
if (data) {
if (host->fifo_mode) {
dwmci_writel(host, DWMCI_BLKSIZ, data->blocksize);
dwmci_writel(host, DWMCI_BYTCNT,
data->blocksize * data->blocks);
dwmci_wait_reset(host, DWMCI_CTRL_FIFO_RESET);
} else {
if (data->flags == MMC_DATA_READ) {
bounce_buffer_start(&bbstate, (void*)data->dest,
data->blocksize *
@ -177,6 +222,7 @@ static int dwmci_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd,
dwmci_prepare_data(host, data, cur_idmac,
bbstate.bounce_buffer);
}
}
dwmci_writel(host, DWMCI_CMDARG, cmd->cmdarg);
@ -249,13 +295,16 @@ static int dwmci_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd,
}
if (data) {
ret = dwmci_data_transfer(host);
ret = dwmci_data_transfer(host, data);
/* only dma mode need it */
if (!host->fifo_mode) {
ctrl = dwmci_readl(host, DWMCI_CTRL);
ctrl &= ~(DWMCI_DMA_EN);
dwmci_writel(host, DWMCI_CTRL, ctrl);
bounce_buffer_stop(&bbstate);
}
}
udelay(100);

5
include/dwmmc.h
View File

@ -105,6 +105,8 @@
/* Status Register */
#define DWMCI_BUSY (1 << 9)
#define DWMCI_FIFO_MASK 0x1ff
#define DWMCI_FIFO_SHIFT 17
/* FIFOTH Register */
#define MSIZE(x) ((x) << 28)
@ -180,6 +182,9 @@ struct dwmci_host {
unsigned int (*get_mmc_clk)(struct dwmci_host *host, uint freq);
struct mmc_config cfg;
/* use fifo mode to read and write data */
bool fifo_mode;
};
struct dwmci_idmac {