[PATCH v4 2/4] mmc: dw_mmc-exynos: Add support for ARTPEC-8

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The ARTPEC-8 SoC has a DWMMC controller that is compatible with the
Exynos 7 version v2.70a. The main differences from Exynos 7 is that it
does not support HS400 and has extended data read timeout.

This patch adds compatibility string "axis,artpec8-dw-mshc" for
ARTPEC-8, and DW_MCI_TYPE_ARTPEC8 is added to the dw_mci_exynos_type.

Signed-off-by: Mårten Lindahl <marten.lindahl@xxxxxxxx>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxxxxx>
---

v2:
 - Change compatible string vendor prefix

v3 -> v4:
 - Add Krzysztof's Acked-by tag

 drivers/mmc/host/dw_mmc-exynos.c | 47 ++++++++++++++++++++++++--------
 1 file changed, 36 insertions(+), 11 deletions(-)

diff --git a/drivers/mmc/host/dw_mmc-exynos.c b/drivers/mmc/host/dw_mmc-exynos.c
index f76eeeb0cc53..86486e6659de 100644
--- a/drivers/mmc/host/dw_mmc-exynos.c
+++ b/drivers/mmc/host/dw_mmc-exynos.c
@@ -28,6 +28,7 @@ enum dw_mci_exynos_type {
 	DW_MCI_TYPE_EXYNOS5420_SMU,
 	DW_MCI_TYPE_EXYNOS7,
 	DW_MCI_TYPE_EXYNOS7_SMU,
+	DW_MCI_TYPE_ARTPEC8,
 };
 
 /* Exynos implementation specific driver private data */
@@ -69,6 +70,9 @@ static struct dw_mci_exynos_compatible {
 	}, {
 		.compatible	= "samsung,exynos7-dw-mshc-smu",
 		.ctrl_type	= DW_MCI_TYPE_EXYNOS7_SMU,
+	}, {
+		.compatible	= "axis,artpec8-dw-mshc",
+		.ctrl_type	= DW_MCI_TYPE_ARTPEC8,
 	},
 };
 
@@ -81,7 +85,8 @@ static inline u8 dw_mci_exynos_get_ciu_div(struct dw_mci *host)
 	else if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS4210)
 		return EXYNOS4210_FIXED_CIU_CLK_DIV;
 	else if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 ||
-			priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU)
+			priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU ||
+			priv->ctrl_type == DW_MCI_TYPE_ARTPEC8)
 		return SDMMC_CLKSEL_GET_DIV(mci_readl(host, CLKSEL64)) + 1;
 	else
 		return SDMMC_CLKSEL_GET_DIV(mci_readl(host, CLKSEL)) + 1;
@@ -133,7 +138,8 @@ static void dw_mci_exynos_set_clksel_timing(struct dw_mci *host, u32 timing)
 	u32 clksel;
 
 	if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 ||
-		priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU)
+		priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU ||
+		priv->ctrl_type == DW_MCI_TYPE_ARTPEC8)
 		clksel = mci_readl(host, CLKSEL64);
 	else
 		clksel = mci_readl(host, CLKSEL);
@@ -141,7 +147,8 @@ static void dw_mci_exynos_set_clksel_timing(struct dw_mci *host, u32 timing)
 	clksel = (clksel & ~SDMMC_CLKSEL_TIMING_MASK) | timing;
 
 	if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 ||
-		priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU)
+		priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU ||
+		priv->ctrl_type == DW_MCI_TYPE_ARTPEC8)
 		mci_writel(host, CLKSEL64, clksel);
 	else
 		mci_writel(host, CLKSEL, clksel);
@@ -210,14 +217,16 @@ static int dw_mci_exynos_resume_noirq(struct device *dev)
 		return ret;
 
 	if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 ||
-		priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU)
+		priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU ||
+		priv->ctrl_type == DW_MCI_TYPE_ARTPEC8)
 		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)
+			priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU ||
+			priv->ctrl_type == DW_MCI_TYPE_ARTPEC8)
 			mci_writel(host, CLKSEL64, clksel);
 		else
 			mci_writel(host, CLKSEL, clksel);
@@ -238,7 +247,8 @@ static void dw_mci_exynos_config_hs400(struct dw_mci *host, u32 timing)
 	 * Not supported to configure register
 	 * related to HS400
 	 */
-	if (priv->ctrl_type < DW_MCI_TYPE_EXYNOS5420) {
+	if ((priv->ctrl_type < DW_MCI_TYPE_EXYNOS5420) ||
+		(priv->ctrl_type == DW_MCI_TYPE_ARTPEC8)) {
 		if (timing == MMC_TIMING_MMC_HS400)
 			dev_warn(host->dev,
 				 "cannot configure HS400, unsupported chipset\n");
@@ -394,7 +404,8 @@ static inline u8 dw_mci_exynos_get_clksmpl(struct dw_mci *host)
 	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)
+		priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU ||
+		priv->ctrl_type == DW_MCI_TYPE_ARTPEC8)
 		return SDMMC_CLKSEL_CCLK_SAMPLE(mci_readl(host, CLKSEL64));
 	else
 		return SDMMC_CLKSEL_CCLK_SAMPLE(mci_readl(host, CLKSEL));
@@ -406,13 +417,15 @@ static inline void dw_mci_exynos_set_clksmpl(struct dw_mci *host, u8 sample)
 	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)
+		priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU ||
+		priv->ctrl_type == DW_MCI_TYPE_ARTPEC8)
 		clksel = mci_readl(host, CLKSEL64);
 	else
 		clksel = mci_readl(host, CLKSEL);
 	clksel = SDMMC_CLKSEL_UP_SAMPLE(clksel, sample);
 	if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 ||
-		priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU)
+		priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU ||
+		priv->ctrl_type == DW_MCI_TYPE_ARTPEC8)
 		mci_writel(host, CLKSEL64, clksel);
 	else
 		mci_writel(host, CLKSEL, clksel);
@@ -425,7 +438,8 @@ static inline u8 dw_mci_exynos_move_next_clksmpl(struct dw_mci *host)
 	u8 sample;
 
 	if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 ||
-		priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU)
+		priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU ||
+		priv->ctrl_type == DW_MCI_TYPE_ARTPEC8)
 		clksel = mci_readl(host, CLKSEL64);
 	else
 		clksel = mci_readl(host, CLKSEL);
@@ -434,7 +448,8 @@ static inline u8 dw_mci_exynos_move_next_clksmpl(struct dw_mci *host)
 	clksel = SDMMC_CLKSEL_UP_SAMPLE(clksel, sample);
 
 	if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 ||
-		priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU)
+		priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU ||
+		priv->ctrl_type == DW_MCI_TYPE_ARTPEC8)
 		mci_writel(host, CLKSEL64, clksel);
 	else
 		mci_writel(host, CLKSEL, clksel);
@@ -543,6 +558,14 @@ static const struct dw_mci_drv_data exynos_drv_data = {
 	.prepare_hs400_tuning	= dw_mci_exynos_prepare_hs400_tuning,
 };
 
+static const struct dw_mci_drv_data artpec_drv_data = {
+	.common_caps		= MMC_CAP_CMD23,
+	.init			= dw_mci_exynos_priv_init,
+	.set_ios		= dw_mci_exynos_set_ios,
+	.parse_dt		= dw_mci_exynos_parse_dt,
+	.execute_tuning		= dw_mci_exynos_execute_tuning,
+};
+
 static const struct of_device_id dw_mci_exynos_match[] = {
 	{ .compatible = "samsung,exynos4412-dw-mshc",
 			.data = &exynos_drv_data, },
@@ -556,6 +579,8 @@ static const struct of_device_id dw_mci_exynos_match[] = {
 			.data = &exynos_drv_data, },
 	{ .compatible = "samsung,exynos7-dw-mshc-smu",
 			.data = &exynos_drv_data, },
+	{ .compatible = "axis,artpec8-dw-mshc",
+			.data = &artpec_drv_data, },
 	{},
 };
 MODULE_DEVICE_TABLE(of, dw_mci_exynos_match);
-- 
2.20.1
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