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mmc: wmt-sdmmc: Fix settting BM_EIGHTBIT_MODE bit in wmt_mci_set_ios() 

For MMC_BUS_WIDTH_8 case, current code missed setting BM_EIGHTBIT_MODE bit.
Also has a small refactor to make the code looks better in readability.

So the bit settings witch below logic:

SDMMC_BUSMODE register:
Set EIGHTBIT_MODE bit for 8 bit mode, Set FOURBIT_MODE bit for 4 bit mode.
Clear both EIGHTBIT_MODE and FOURBIT_MODE bits for 1 bit mode.

SDMMC_EXTCTRL register:
Set EXT_EIGHTBIT bit for 8 bit mode, Clear EXT_EIGHTBIT bit for 1/4 bit mode.

Add define for EXT_EIGHTBIT to avoid using magic number.
BM_ONEBIT_MASK is no longer used, thus remove it.

This patch is untested due to lack of platform with 8-bit hardware.
However since the code is there, it's good to make the code match the document.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Axel Lin 2014-04-27 18:22:51 +08:00 committed by Ulf Hansson
parent 5e863662ad
commit 889c9e04f1
1 changed files with 15 additions and 16 deletions
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31
drivers/mmc/host/wmt-sdmmc.c
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@ -72,7 +72,6 @@
#define BM_SPI_CS 0x20
#define BM_SD_POWER 0x40
#define BM_SOFT_RESET 0x80
#define BM_ONEBIT_MASK 0xFD
/* SDMMC_BLKLEN bit fields */
#define BLKL_CRCERR_ABORT 0x0800
@ -120,6 +119,8 @@
#define STS2_DATARSP_BUSY 0x20
#define STS2_DIS_FORCECLK 0x80
/* SDMMC_EXTCTRL bit fields */
#define EXT_EIGHTBIT 0x04
/* MMC/SD DMA Controller Registers */
#define SDDMA_GCR 0x100
@ -672,7 +673,7 @@ static void wmt_mci_request(struct mmc_host *mmc, struct mmc_request *req)
static void wmt_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
struct wmt_mci_priv *priv;
u32 reg_tmp;
u32 busmode, extctrl;
priv = mmc_priv(mmc);
@ -687,28 +688,26 @@ static void wmt_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
if (ios->clock != 0)
clk_set_rate(priv->clk_sdmmc, ios->clock);
busmode = readb(priv->sdmmc_base + SDMMC_BUSMODE);
extctrl = readb(priv->sdmmc_base + SDMMC_EXTCTRL);
busmode &= ~(BM_EIGHTBIT_MODE | BM_FOURBIT_MODE);
extctrl &= ~EXT_EIGHTBIT;
switch (ios->bus_width) {
case MMC_BUS_WIDTH_8:
reg_tmp = readb(priv->sdmmc_base + SDMMC_EXTCTRL);
writeb(reg_tmp | 0x04, priv->sdmmc_base + SDMMC_EXTCTRL);
busmode |= BM_EIGHTBIT_MODE;
extctrl |= EXT_EIGHTBIT;
break;
case MMC_BUS_WIDTH_4:
reg_tmp = readb(priv->sdmmc_base + SDMMC_BUSMODE);
writeb(reg_tmp | BM_FOURBIT_MODE, priv->sdmmc_base +
SDMMC_BUSMODE);
reg_tmp = readb(priv->sdmmc_base + SDMMC_EXTCTRL);
writeb(reg_tmp & 0xFB, priv->sdmmc_base + SDMMC_EXTCTRL);
busmode |= BM_FOURBIT_MODE;
break;
case MMC_BUS_WIDTH_1:
reg_tmp = readb(priv->sdmmc_base + SDMMC_BUSMODE);
writeb(reg_tmp & BM_ONEBIT_MASK, priv->sdmmc_base +
SDMMC_BUSMODE);
reg_tmp = readb(priv->sdmmc_base + SDMMC_EXTCTRL);
writeb(reg_tmp & 0xFB, priv->sdmmc_base + SDMMC_EXTCTRL);
break;
}
writeb(busmode, priv->sdmmc_base + SDMMC_BUSMODE);
writeb(extctrl, priv->sdmmc_base + SDMMC_EXTCTRL);
}
static int wmt_mci_get_ro(struct mmc_host *mmc)