mmc: t210: Add autocal and tap/trim updates for SDMMC1/3

As per the T210 TRM, when running at 3.3v, the SDMMC1 tap/trim and
autocal values need to be set to condition the signals correctly before
talking to the SD-card. This is the same as what's being done in CBoot,
but it gets reset when the SDMMC1 HW is soft-reset during SD driver
init, so needs to be repeated here. Also set autocal and tap/trim for
SDMMC3, although no T210 boards use it for SD-card at this time.

Signed-off-by: Tom Warren <twarren@nvidia.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>

1 files changed, 76 insertions, 8 deletions

diff --git a/drivers/mmc/tegra_mmc.c b/drivers/mmc/tegra_mmc.c
index f022e93552..73ac58c6c8 100644
--- a/drivers/mmc/tegra_mmc.c
+++ b/drivers/mmc/tegra_mmc.c
@@ -3,7 +3,7 @@
  * (C) Copyright 2009 SAMSUNG Electronics
  * Minkyu Kang <mk7.kang@samsung.com>
  * Jaehoon Chung <jh80.chung@samsung.com>
- * Portions Copyright 2011-2016 NVIDIA Corporation
+ * Portions Copyright 2011-2019 NVIDIA Corporation
  */
 
 #include <bouncebuf.h>
@@ -15,6 +15,9 @@
 #include <asm/io.h>
 #include <asm/arch-tegra/tegra_mmc.h>
 #include <linux/err.h>
+#if defined(CONFIG_TEGRA30) || defined(CONFIG_TEGRA210)
+#include <asm/arch/clock.h>
+#endif
 
 struct tegra_mmc_plat {
 	struct mmc_config cfg;
@@ -30,6 +33,7 @@ struct tegra_mmc_priv {
 	struct gpio_desc wp_gpio;	/* Write Protect GPIO */
 	unsigned int version;	/* SDHCI spec. version */
 	unsigned int clock;	/* Current clock (MHz) */
+	int mmc_id;		/* peripheral id */
 };
 
 static void tegra_mmc_set_power(struct tegra_mmc_priv *priv,
@@ -446,16 +450,19 @@ static int tegra_mmc_set_ios(struct udevice *dev)
 
 static void tegra_mmc_pad_init(struct tegra_mmc_priv *priv)
 {
-#if defined(CONFIG_TEGRA30)
+#if defined(CONFIG_TEGRA30) || defined(CONFIG_TEGRA210)
 	u32 val;
+	u16 clk_con;
+	int timeout;
+	int id = priv->mmc_id;
 
-	debug("%s: sdmmc address = %08x\n", __func__, (unsigned int)priv->reg);
+	debug("%s: sdmmc address = %p, id = %d\n", __func__,
+		priv->reg, id);
 
 	/* Set the pad drive strength for SDMMC1 or 3 only */
-	if (priv->reg != (void *)0x78000000 &&
-	    priv->reg != (void *)0x78000400) {
+	if (id != PERIPH_ID_SDMMC1 && id != PERIPH_ID_SDMMC3) {
 		debug("%s: settings are only valid for SDMMC1/SDMMC3!\n",
-		      __func__);
+			__func__);
 		return;
 	}
 
@@ -464,11 +471,65 @@ static void tegra_mmc_pad_init(struct tegra_mmc_priv *priv)
 	val |= MEMCOMP_PADCTRL_VREF;
 	writel(val, &priv->reg->sdmemcmppadctl);
 
+	/* Disable SD Clock Enable before running auto-cal as per TRM */
+	clk_con = readw(&priv->reg->clkcon);
+	debug("%s: CLOCK_CONTROL = 0x%04X\n", __func__, clk_con);
+	clk_con &= ~TEGRA_MMC_CLKCON_SD_CLOCK_ENABLE;
+	writew(clk_con, &priv->reg->clkcon);
+
 	val = readl(&priv->reg->autocalcfg);
 	val &= 0xFFFF0000;
-	val |= AUTO_CAL_PU_OFFSET | AUTO_CAL_PD_OFFSET | AUTO_CAL_ENABLED;
+	val |= AUTO_CAL_PU_OFFSET | AUTO_CAL_PD_OFFSET;
 	writel(val, &priv->reg->autocalcfg);
-#endif
+	val |= AUTO_CAL_START | AUTO_CAL_ENABLE;
+	writel(val, &priv->reg->autocalcfg);
+	debug("%s: AUTO_CAL_CFG = 0x%08X\n", __func__, val);
+	udelay(1);
+	timeout = 100;				/* 10 mSec max (100*100uS) */
+	do {
+		val = readl(&priv->reg->autocalsts);
+		udelay(100);
+	} while ((val & AUTO_CAL_ACTIVE) && --timeout);
+	val = readl(&priv->reg->autocalsts);
+	debug("%s: Final AUTO_CAL_STATUS = 0x%08X, timeout = %d\n",
+	      __func__, val, timeout);
+
+	/* Re-enable SD Clock Enable when auto-cal is done */
+	clk_con |= TEGRA_MMC_CLKCON_SD_CLOCK_ENABLE;
+	writew(clk_con, &priv->reg->clkcon);
+	clk_con = readw(&priv->reg->clkcon);
+	debug("%s: final CLOCK_CONTROL = 0x%04X\n", __func__, clk_con);
+
+	if (timeout == 0) {
+		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 */
 }
 
 static void tegra_mmc_reset(struct tegra_mmc_priv *priv, struct mmc *mmc)
@@ -514,6 +575,13 @@ static int tegra_mmc_init(struct udevice *dev)
 	unsigned int mask;
 	debug(" tegra_mmc_init called\n");
 
+#if defined(CONFIG_TEGRA210)
+	priv->mmc_id = clock_decode_periph_id(dev);
+	if (priv->mmc_id == PERIPH_ID_NONE) {
+		printf("%s: Missing/invalid peripheral ID\n", __func__);
+		return -EINVAL;
+	}
+#endif
 	tegra_mmc_reset(priv, mmc);
 
 #if defined(CONFIG_TEGRA124_MMC_DISABLE_EXT_LOOPBACK)