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mmc: dw_mmc: exynos: Add support for exynos7

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The Exynos7 has a DWMMC controller (v2.70a) which is different from
prior versions. This patch adds new compatible strings for exynos7.
This patch also fixes the CLKSEL register offset on exynos7.

Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com>
Signed-off-by: Yuvaraj Kumar C D <yuvaraj.cd@samsung.com>
Tested-by: Vivek Gautam <gautam.vivek@samsung.com>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Abhilash Kesavan 2014-08-28 18:48:53 +05:30 committed by Ulf Hansson
parent 2d079c43bc
commit 89ad2be75a
2 changed files with 82 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
Documentation/devicetree/bindings/mmc/exynos-dw-mshc.txt
View File

@ -18,6 +18,10 @@ Required Properties:
specific extensions.
- "samsung,exynos5420-dw-mshc": for controllers with Samsung Exynos5420
specific extensions.
- "samsung,exynos7-dw-mshc": for controllers with Samsung Exynos7
specific extensions.
- "samsung,exynos7-dw-mshc-smu": for controllers with Samsung Exynos7
specific extensions having an SMU.
* samsung,dw-mshc-ciu-div: Specifies the divider value for the card interface
unit (ciu) clock. This property is applicable only for Exynos5 SoC's and

91
drivers/mmc/host/dw_mmc-exynos.c
View File

@ -25,6 +25,7 @@
#define NUM_PINS(x) (x + 2)
#define SDMMC_CLKSEL 0x09C
#define SDMMC_CLKSEL64 0x0A8
#define SDMMC_CLKSEL_CCLK_SAMPLE(x) (((x) & 7) << 0)
#define SDMMC_CLKSEL_CCLK_DRIVE(x) (((x) & 7) << 16)
#define SDMMC_CLKSEL_CCLK_DIVIDER(x) (((x) & 7) << 24)
@ -65,6 +66,8 @@ enum dw_mci_exynos_type {
DW_MCI_TYPE_EXYNOS5250,
DW_MCI_TYPE_EXYNOS5420,
DW_MCI_TYPE_EXYNOS5420_SMU,
DW_MCI_TYPE_EXYNOS7,
DW_MCI_TYPE_EXYNOS7_SMU,
};
/* Exynos implementation specific driver private data */
@ -95,6 +98,12 @@ static struct dw_mci_exynos_compatible {
}, {
.compatible = "samsung,exynos5420-dw-mshc-smu",
.ctrl_type = DW_MCI_TYPE_EXYNOS5420_SMU,
}, {
.compatible = "samsung,exynos7-dw-mshc",
.ctrl_type = DW_MCI_TYPE_EXYNOS7,
}, {
.compatible = "samsung,exynos7-dw-mshc-smu",
.ctrl_type = DW_MCI_TYPE_EXYNOS7_SMU,
},
};
@ -102,7 +111,8 @@ static int dw_mci_exynos_priv_init(struct dw_mci *host)
{
struct dw_mci_exynos_priv_data *priv = host->priv;
if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS5420_SMU) {
if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS5420_SMU ||
priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) {
mci_writel(host, MPSBEGIN0, 0);
mci_writel(host, MPSEND0, DWMCI_BLOCK_NUM);
mci_writel(host, MPSCTRL0, DWMCI_MPSCTRL_SECURE_WRITE_BIT |
@ -153,11 +163,22 @@ static int dw_mci_exynos_resume(struct device *dev)
static int dw_mci_exynos_resume_noirq(struct device *dev)
{
struct dw_mci *host = dev_get_drvdata(dev);
struct dw_mci_exynos_priv_data *priv = host->priv;
u32 clksel;
clksel = mci_readl(host, CLKSEL);
if (clksel & SDMMC_CLKSEL_WAKEUP_INT)
mci_writel(host, CLKSEL, clksel);
if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 ||
priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU)
clksel = mci_readl(host, CLKSEL64);
else
clksel = mci_readl(host, CLKSEL);
if (clksel & SDMMC_CLKSEL_WAKEUP_INT) {
if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 ||
priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU)
mci_writel(host, CLKSEL64, clksel);
else
mci_writel(host, CLKSEL, clksel);
}
return 0;
}
@ -169,6 +190,7 @@ static int dw_mci_exynos_resume_noirq(struct device *dev)
static void dw_mci_exynos_prepare_command(struct dw_mci *host, u32 *cmdr)
{
struct dw_mci_exynos_priv_data *priv = host->priv;
/*
* Exynos4412 and Exynos5250 extends the use of CMD register with the
* use of bit 29 (which is reserved on standard MSHC controllers) for
@ -176,8 +198,14 @@ static void dw_mci_exynos_prepare_command(struct dw_mci *host, u32 *cmdr)
* HOLD register should be bypassed in case there is no phase shift
* applied on CMD/DATA that is sent to the card.
*/
if (SDMMC_CLKSEL_GET_DRV_WD3(mci_readl(host, CLKSEL)))
*cmdr |= SDMMC_CMD_USE_HOLD_REG;
if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 ||
priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) {
if (SDMMC_CLKSEL_GET_DRV_WD3(mci_readl(host, CLKSEL64)))
*cmdr |= SDMMC_CMD_USE_HOLD_REG;
} else {
if (SDMMC_CLKSEL_GET_DRV_WD3(mci_readl(host, CLKSEL)))
*cmdr |= SDMMC_CMD_USE_HOLD_REG;
}
}
static void dw_mci_exynos_set_ios(struct dw_mci *host, struct mmc_ios *ios)
@ -188,12 +216,20 @@ static void dw_mci_exynos_set_ios(struct dw_mci *host, struct mmc_ios *ios)
u8 div = priv->ciu_div + 1;
if (ios->timing == MMC_TIMING_MMC_DDR52) {
mci_writel(host, CLKSEL, priv->ddr_timing);
if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 ||
priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU)
mci_writel(host, CLKSEL64, priv->ddr_timing);
else
mci_writel(host, CLKSEL, priv->ddr_timing);
/* Should be double rate for DDR mode */
if (ios->bus_width == MMC_BUS_WIDTH_8)
wanted <<= 1;
} else {
mci_writel(host, CLKSEL, priv->sdr_timing);
if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 ||
priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU)
mci_writel(host, CLKSEL64, priv->sdr_timing);
else
mci_writel(host, CLKSEL, priv->sdr_timing);
}
/* Don't care if wanted clock is zero */
@ -265,26 +301,51 @@ static int dw_mci_exynos_parse_dt(struct dw_mci *host)
static inline u8 dw_mci_exynos_get_clksmpl(struct dw_mci *host)
{
return SDMMC_CLKSEL_CCLK_SAMPLE(mci_readl(host, CLKSEL));
struct dw_mci_exynos_priv_data *priv = host->priv;
if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 ||
priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU)
return SDMMC_CLKSEL_CCLK_SAMPLE(mci_readl(host, CLKSEL64));
else
return SDMMC_CLKSEL_CCLK_SAMPLE(mci_readl(host, CLKSEL));
}
static inline void dw_mci_exynos_set_clksmpl(struct dw_mci *host, u8 sample)
{
u32 clksel;
clksel = mci_readl(host, CLKSEL);
struct dw_mci_exynos_priv_data *priv = host->priv;
if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 ||
priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU)
clksel = mci_readl(host, CLKSEL64);
else
clksel = mci_readl(host, CLKSEL);
clksel = (clksel & ~0x7) | SDMMC_CLKSEL_CCLK_SAMPLE(sample);
mci_writel(host, CLKSEL, clksel);
if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 ||
priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU)
mci_writel(host, CLKSEL64, clksel);
else
mci_writel(host, CLKSEL, clksel);
}
static inline u8 dw_mci_exynos_move_next_clksmpl(struct dw_mci *host)
{
struct dw_mci_exynos_priv_data *priv = host->priv;
u32 clksel;
u8 sample;
clksel = mci_readl(host, CLKSEL);
if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 ||
priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU)
clksel = mci_readl(host, CLKSEL64);
else
clksel = mci_readl(host, CLKSEL);
sample = (clksel + 1) & 0x7;
clksel = (clksel & ~0x7) | sample;
mci_writel(host, CLKSEL, clksel);
if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 ||
priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU)
mci_writel(host, CLKSEL64, clksel);
else
mci_writel(host, CLKSEL, clksel);
return sample;
}
@ -411,6 +472,10 @@ static const struct of_device_id dw_mci_exynos_match[] = {
.data = &exynos_drv_data, },
{ .compatible = "samsung,exynos5420-dw-mshc-smu",
.data = &exynos_drv_data, },
{ .compatible = "samsung,exynos7-dw-mshc",
.data = &exynos_drv_data, },
{ .compatible = "samsung,exynos7-dw-mshc-smu",
.data = &exynos_drv_data, },
{},
};
MODULE_DEVICE_TABLE(of, dw_mci_exynos_match);