[PATCH v3 2/2] mmc: tegra: get default-tap and default-trim from device tree

[Svyatoslav Ryhel]

Default-tap and default-trim values are used for eMMC setup
mostly on T114+ devices. As for now, those values are hardcoded
for T210 and ignored for all other Tegra generations. Fix this
by passing tap and trim values from dts.

Signed-off-by: Svyatoslav Ryhel <clamor95 at gmail.com>
---
 arch/arm/include/asm/arch-tegra/tegra_mmc.h | 17 +++----
 drivers/mmc/tegra_mmc.c                     | 52 +++++++++++----------
 2 files changed, 36 insertions(+), 33 deletions(-)

diff --git a/arch/arm/include/asm/arch-tegra/tegra_mmc.h b/arch/arm/include/asm/arch-tegra/tegra_mmc.h
index d6a55764ba..750c7d809e 100644
--- a/arch/arm/include/asm/arch-tegra/tegra_mmc.h
+++ b/arch/arm/include/asm/arch-tegra/tegra_mmc.h
@@ -128,21 +128,22 @@ struct tegra_mmc {
 
 /* SDMMC1/3 settings from SDMMCx Initialization Sequence of TRM */
 #define MEMCOMP_PADCTRL_VREF	7
-#define AUTO_CAL_ENABLE		(1 << 29)
-#define AUTO_CAL_ACTIVE		(1 << 31)
-#define AUTO_CAL_START		(1 << 31)
+#define AUTO_CAL_ENABLE		BIT(29)
+#define AUTO_CAL_ACTIVE		BIT(31)
+#define AUTO_CAL_START		BIT(31)
+
 #if defined(CONFIG_TEGRA210)
 #define AUTO_CAL_PD_OFFSET	(0x7D << 8)
 #define AUTO_CAL_PU_OFFSET	(0 << 0)
-#define IO_TRIM_BYPASS_MASK	(1 << 2)
-#define TRIM_VAL_SHIFT		24
-#define TRIM_VAL_MASK		(0x1F << TRIM_VAL_SHIFT)
-#define TAP_VAL_SHIFT		16
-#define TAP_VAL_MASK		(0xFF << TAP_VAL_SHIFT)
 #else
 #define AUTO_CAL_PD_OFFSET	(0x70 << 8)
 #define AUTO_CAL_PU_OFFSET	(0x62 << 0)
 #endif
 
+#define TRIM_VAL_SHIFT		24
+#define TRIM_VAL_MASK		(0x1F << TRIM_VAL_SHIFT)
+#define TAP_VAL_SHIFT		16
+#define TAP_VAL_MASK		(0xFF << TAP_VAL_SHIFT)
+
 #endif	/* __ASSEMBLY__ */
 #endif	/* __TEGRA_MMC_H_ */
diff --git a/drivers/mmc/tegra_mmc.c b/drivers/mmc/tegra_mmc.c
index f76fee3ea0..d507adbb36 100644
--- a/drivers/mmc/tegra_mmc.c
+++ b/drivers/mmc/tegra_mmc.c
@@ -37,6 +37,9 @@ struct tegra_mmc_priv {
 	unsigned int version;	/* SDHCI spec. version */
 	unsigned int clock;	/* Current clock (MHz) */
 	int mmc_id;		/* peripheral id */
+
+	int tap_value;
+	int trim_value;
 };
 
 static void tegra_mmc_set_power(struct tegra_mmc_priv *priv,
@@ -526,31 +529,6 @@ static void tegra_mmc_pad_init(struct tegra_mmc_priv *priv)
 		printf("%s: Warning: Autocal timed out!\n", __func__);
 		/* TBD: Set CFG2TMC_SDMMC1_PAD_CAL_DRV* regs here */
 	}
-
-#if defined(CONFIG_TEGRA210)
-	u32 tap_value, trim_value;
-
-	/* Set tap/trim values for SDMMC1/3 @ <48MHz here */
-	val = readl(&priv->reg->venspictl);	/* aka VENDOR_SYS_SW_CNTL */
-	val &= IO_TRIM_BYPASS_MASK;
-	if (id == PERIPH_ID_SDMMC1) {
-		tap_value = 4;			/* default */
-		if (val)
-			tap_value = 3;
-		trim_value = 2;
-	} else {				/* SDMMC3 */
-		tap_value = 3;
-		trim_value = 3;
-	}
-
-	val = readl(&priv->reg->venclkctl);
-	val &= ~TRIM_VAL_MASK;
-	val |= (trim_value << TRIM_VAL_SHIFT);
-	val &= ~TAP_VAL_MASK;
-	val |= (tap_value << TAP_VAL_SHIFT);
-	writel(val, &priv->reg->venclkctl);
-	debug("%s: VENDOR_CLOCK_CNTRL = 0x%08X\n", __func__, val);
-#endif	/* T210 */
 #endif	/* T30/T210 */
 }
 
@@ -588,6 +566,22 @@ static void tegra_mmc_reset(struct tegra_mmc_priv *priv, struct mmc *mmc)
 
 	/* Make sure SDIO pads are set up */
 	tegra_mmc_pad_init(priv);
+
+	if (!IS_ERR_VALUE(priv->tap_value) ||
+	    !IS_ERR_VALUE(priv->trim_value)) {
+		u32 val;
+
+		val = readl(&priv->reg->venclkctl);
+
+		val &= ~TRIM_VAL_MASK;
+		val |= (priv->trim_value << TRIM_VAL_SHIFT);
+
+		val &= ~TAP_VAL_MASK;
+		val |= (priv->tap_value << TAP_VAL_SHIFT);
+
+		writel(val, &priv->reg->venclkctl);
+		debug("%s: VENDOR_CLOCK_CNTRL = 0x%08X\n", __func__, val);
+	}
 }
 
 static int tegra_mmc_init(struct udevice *dev)
@@ -742,6 +736,14 @@ static int tegra_mmc_probe(struct udevice *dev)
 	if (dm_gpio_is_valid(&priv->pwr_gpio))
 		dm_gpio_set_value(&priv->pwr_gpio, 1);
 
+	ret = dev_read_u32(dev, "nvidia,default-tap", &priv->tap_value);
+	if (ret)
+		priv->tap_value = ret;
+
+	ret = dev_read_u32(dev, "nvidia,default-trim", &priv->trim_value);
+	if (ret)
+		priv->trim_value = ret;
+
 	upriv->mmc = &plat->mmc;
 
 	return tegra_mmc_init(dev);
-- 
2.39.2