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authorShawn Guo <shawn.guo@linaro.org>2011-09-19 17:32:21 +0800
committerChris Ball <cjb@laptop.org>2011-10-26 16:32:10 -0400
commit95a2482a9baaf55a3403d2e76f2abd7c0a32298c (patch)
treeaa82292426d77cd3951f57afbe1354260d343975 /drivers/mmc/host/sdhci-esdhc-imx.c
parentcd8a3666987ba20908bbeb7c78ed9ba82b365643 (diff)
downloadvexpress-lsk-95a2482a9baaf55a3403d2e76f2abd7c0a32298c.tar.gz
mmc: sdhci-esdhc-imx: add basic imx6q usdhc support
This patch adds the basic support for imx6q usdhc, which is a derivative of esdhc controller. Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers/mmc/host/sdhci-esdhc-imx.c')
-rw-r--r--drivers/mmc/host/sdhci-esdhc-imx.c36
1 files changed, 32 insertions, 4 deletions
diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
index 4557aa1567a..ae57769ba50 100644
--- a/drivers/mmc/host/sdhci-esdhc-imx.c
+++ b/drivers/mmc/host/sdhci-esdhc-imx.c
@@ -32,6 +32,7 @@
/* VENDOR SPEC register */
#define SDHCI_VENDOR_SPEC 0xC0
#define SDHCI_VENDOR_SPEC_SDIO_QUIRK 0x00000002
+#define SDHCI_MIX_CTRL 0x48
/*
* There is an INT DMA ERR mis-match between eSDHC and STD SDHC SPEC:
@@ -59,6 +60,7 @@ enum imx_esdhc_type {
IMX35_ESDHC,
IMX51_ESDHC,
IMX53_ESDHC,
+ IMX6Q_USDHC,
};
struct pltfm_imx_data {
@@ -82,6 +84,9 @@ static struct platform_device_id imx_esdhc_devtype[] = {
.name = "sdhci-esdhc-imx53",
.driver_data = IMX53_ESDHC,
}, {
+ .name = "sdhci-usdhc-imx6q",
+ .driver_data = IMX6Q_USDHC,
+ }, {
/* sentinel */
}
};
@@ -92,6 +97,7 @@ static const struct of_device_id imx_esdhc_dt_ids[] = {
{ .compatible = "fsl,imx35-esdhc", .data = &imx_esdhc_devtype[IMX35_ESDHC], },
{ .compatible = "fsl,imx51-esdhc", .data = &imx_esdhc_devtype[IMX51_ESDHC], },
{ .compatible = "fsl,imx53-esdhc", .data = &imx_esdhc_devtype[IMX53_ESDHC], },
+ { .compatible = "fsl,imx6q-usdhc", .data = &imx_esdhc_devtype[IMX6Q_USDHC], },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, imx_esdhc_dt_ids);
@@ -116,6 +122,11 @@ static inline int is_imx53_esdhc(struct pltfm_imx_data *data)
return data->devtype == IMX53_ESDHC;
}
+static inline int is_imx6q_usdhc(struct pltfm_imx_data *data)
+{
+ return data->devtype == IMX6Q_USDHC;
+}
+
static inline void esdhc_clrset_le(struct sdhci_host *host, u32 mask, u32 val, int reg)
{
void __iomem *base = host->ioaddr + (reg & ~0x3);
@@ -220,8 +231,16 @@ static void esdhc_writel_le(struct sdhci_host *host, u32 val, int reg)
static u16 esdhc_readw_le(struct sdhci_host *host, int reg)
{
- if (unlikely(reg == SDHCI_HOST_VERSION))
- reg ^= 2;
+ if (unlikely(reg == SDHCI_HOST_VERSION)) {
+ u16 val = readw(host->ioaddr + (reg ^ 2));
+ /*
+ * uSDHC supports SDHCI v3.0, but it's encoded as value
+ * 0x3 in host controller version register, which violates
+ * SDHCI_SPEC_300 definition. Work it around here.
+ */
+ if ((val & SDHCI_SPEC_VER_MASK) == 3)
+ return --val;
+ }
return readw(host->ioaddr + reg);
}
@@ -252,8 +271,17 @@ static void esdhc_writew_le(struct sdhci_host *host, u16 val, int reg)
if ((host->cmd->opcode == MMC_STOP_TRANSMISSION)
&& (imx_data->flags & ESDHC_FLAG_MULTIBLK_NO_INT))
val |= SDHCI_CMD_ABORTCMD;
- writel(val << 16 | imx_data->scratchpad,
- host->ioaddr + SDHCI_TRANSFER_MODE);
+
+ if (is_imx6q_usdhc(imx_data)) {
+ u32 m = readl(host->ioaddr + SDHCI_MIX_CTRL);
+ m = imx_data->scratchpad | (m & 0xffff0000);
+ writel(m, host->ioaddr + SDHCI_MIX_CTRL);
+ writel(val << 16,
+ host->ioaddr + SDHCI_TRANSFER_MODE);
+ } else {
+ writel(val << 16 | imx_data->scratchpad,
+ host->ioaddr + SDHCI_TRANSFER_MODE);
+ }
return;
case SDHCI_BLOCK_SIZE:
val &= ~SDHCI_MAKE_BLKSZ(0x7, 0);