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mmc: dw_mmc: support transfer mode autodetection 

dw_mmc supports two transfer modes in u-boot: idma and fifo.
This patch adds autodetection of transfer mode and eliminates setting this in host config struct

Change-Id: I0eafb78c3fd171827664e320b8959f3c5e27094a
Signed-off-by: Paweł Jarosz <paweljarosz3691@gmail.com>
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
This commit is contained in:
Paweł Jarosz 2017-08-17 15:15:40 +02:00 committed by Kever Yang
parent b9370edc3d
commit 39abf9c1e9
2 changed files with 12 additions and 0 deletions
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8
drivers/mmc/dw_mmc.c
View File

@ -574,6 +574,7 @@ static int dwmci_set_ios(struct mmc *mmc)
static int dwmci_init(struct mmc *mmc)
{
struct dwmci_host *host = mmc->priv;
uint32_t use_dma;
if (host->board_init)
host->board_init(host);
@ -585,6 +586,13 @@ static int dwmci_init(struct mmc *mmc)
return -EIO;
}
use_dma = SDMMC_GET_TRANS_MODE(dwmci_readl(host, DWMCI_HCON));
if (use_dma == DMA_INTERFACE_IDMA) {
host->fifo_mode = 0;
} else {
host->fifo_mode = 1;
}
/* Enumerate at 400KHz */
dwmci_setup_bus(host, mmc->cfg->f_min);

4
include/dwmmc.h
View File

@ -115,6 +115,10 @@
#define RX_WMARK_SHIFT 16
#define RX_WMARK_MASK (0xfff << RX_WMARK_SHIFT)
/* HCON Register */
#define DMA_INTERFACE_IDMA (0x0)
#define SDMMC_GET_TRANS_MODE(x) (((x)>>16) & 0x3)
#define DWMCI_IDMAC_OWN (1 << 31)
#define DWMCI_IDMAC_CH (1 << 4)
#define DWMCI_IDMAC_FS (1 << 3)