This patch adds the basic support for imx6q usdhc, which is a
derivative of esdhc controller.
Signed-off-by: Shawn Guo <shawn.guo@xxxxxxxxxx>
---
drivers/mmc/host/Kconfig | 6 +++---
drivers/mmc/host/sdhci-esdhc-imx.c | 36 ++++++++++++++++++++++++++++++++----
2 files changed, 35 insertions(+), 7 deletions(-)
diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index c226d54..87d5067 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -130,13 +130,13 @@ config MMC_SDHCI_CNS3XXX
If unsure, say N.
config MMC_SDHCI_ESDHC_IMX
- tristate "SDHCI platform support for the Freescale eSDHC i.MX controller"
+ tristate "SDHCI support for the Freescale eSDHC/uSDHC i.MX controller"
depends on ARCH_MXC
depends on MMC_SDHCI_PLTFM
select MMC_SDHCI_IO_ACCESSORS
help
- This selects the Freescale eSDHC controller support on the platform
- bus, found on i.MX25, i.MX35 and i.MX5x.
+ This selects the Freescale eSDHC/uSDHC controller support
+ found on i.MX25, i.MX35 i.MX5x and i.MX6x.
If you have a controller with this interface, say Y or M here.
diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
index 4557aa1..ae57769 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);
--
1.7.4.1
--
To unsubscribe from this list: send the line "unsubscribe linux-mmc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
