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CC: <swarren@nvidia.com>, <treding@nvidia.com>, <jonathanh@nvidia.com>,
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Subject: [PATCH 1/2] mmc: t210: Add autocal and tap/trim updates for SDMMC1/3
Date: Thu, 26 Mar 2020 15:30:21 -0700
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From: Tom Warren <twarren@nvidia.com>
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>
---
Changes for v2:
- Added clocks.h include for TEGRA30 to fix T30 32-bit builds
arch/arm/include/asm/arch-tegra/tegra_mmc.h | 20 +++++--
drivers/mmc/tegra_mmc.c | 84 ++++++++++++++++++++++++++---
2 files changed, 92 insertions(+), 12 deletions(-)
diff --git a/arch/arm/include/asm/arch-tegra/tegra_mmc.h b/arch/arm/include/asm/arch-tegra/tegra_mmc.h
index a2b6f63..a8bfa46 100644
--- a/arch/arm/include/asm/arch-tegra/tegra_mmc.h
+++ b/arch/arm/include/asm/arch-tegra/tegra_mmc.h
@@ -2,7 +2,7 @@
/*
* (C) Copyright 2009 SAMSUNG Electronics
* Minkyu Kang <mk7.kang@samsung.com>
- * Portions Copyright (C) 2011-2012 NVIDIA Corporation
+ * Portions Copyright (C) 2011-2012,2019 NVIDIA Corporation
*/
#ifndef __TEGRA_MMC_H_
@@ -52,7 +52,7 @@ struct tegra_mmc {
unsigned char admaerr; /* offset 54h */
unsigned char res4[3]; /* RESERVED, offset 55h-57h */
unsigned long admaaddr; /* offset 58h-5Fh */
- unsigned char res5[0xa0]; /* RESERVED, offset 60h-FBh */
+ unsigned char res5[0x9c]; /* RESERVED, offset 60h-FBh */
unsigned short slotintstatus; /* offset FCh */
unsigned short hcver; /* HOST Version */
unsigned int venclkctl; /* _VENDOR_CLOCK_CNTRL_0, 100h */
@@ -127,11 +127,23 @@ struct tegra_mmc {
#define TEGRA_MMC_NORINTSIGEN_XFER_COMPLETE (1 << 1)
-/* SDMMC1/3 settings from section 24.6 of T30 TRM */
+/* SDMMC1/3 settings from SDMMCx Initialization Sequence of TRM */
#define MEMCOMP_PADCTRL_VREF 7
-#define AUTO_CAL_ENABLED (1 << 29)
+#define AUTO_CAL_ENABLE (1 << 29)
+#if defined(CONFIG_TEGRA210)
+#define AUTO_CAL_ACTIVE (1 << 31)
+#define AUTO_CAL_START (1 << 31)
+#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
#endif /* __ASSEMBLY__ */
#endif /* __TEGRA_MMC_H_ */
diff --git a/drivers/mmc/tegra_mmc.c b/drivers/mmc/tegra_mmc.c
index f022e93..73ac58c 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)
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From: <tomcwarren3959@gmail.com>
To: <u-boot@lists.denx.de>
CC: <swarren@nvidia.com>, <treding@nvidia.com>, <jonathanh@nvidia.com>,
<twarren@nvidia.com>, <jh80.chung@samsung.com>
Subject: [PATCH 2/2] mmc: t210: Fix 'bad' SD-card clock when doing 400KHz
card detect
Date: Thu, 26 Mar 2020 15:30:22 -0700
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From: Tom Warren <twarren@nvidia.com>
According to the HW team, for some reason the normal clock select code
picks what appears to be a perfectly valid 375KHz SD card clock, based
on the CAR clock source and SDMMC1 controller register settings (CAR =
408MHz PLLP0 divided by 68 for 6MHz, then a SD Clock Control register
divisor of 16 = 375KHz). But the resulting SD card clock, as measured by
the HW team, is 700KHz, which is out-of-spec. So the WAR is to use the
values given in the TRM PLLP table to generate a 400KHz SD-clock (CAR
clock of 24.7MHz, SD Clock Control divisor of 62) only for SDMMC1 on
T210 when the requested clock is <= 400KHz. Note that as far as I can
tell, the other requests for clocks in the Tegra MMC driver result in
valid SD clocks.
Signed-off-by: Tom Warren <twarren@nvidia.com>
---
Changes for v2:
- None
arch/arm/include/asm/arch-tegra/tegra_mmc.h | 2 +-
drivers/mmc/tegra_mmc.c | 18 ++++++++++++++++++
2 files changed, 19 insertions(+), 1 deletion(-)
diff --git a/arch/arm/include/asm/arch-tegra/tegra_mmc.h b/arch/arm/include/asm/arch-tegra/tegra_mmc.h
index a8bfa46..70dcf4a 100644
--- a/arch/arm/include/asm/arch-tegra/tegra_mmc.h
+++ b/arch/arm/include/asm/arch-tegra/tegra_mmc.h
@@ -130,9 +130,9 @@ struct tegra_mmc {
/* SDMMC1/3 settings from SDMMCx Initialization Sequence of TRM */
#define MEMCOMP_PADCTRL_VREF 7
#define AUTO_CAL_ENABLE (1 << 29)
-#if defined(CONFIG_TEGRA210)
#define AUTO_CAL_ACTIVE (1 << 31)
#define AUTO_CAL_START (1 << 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)
diff --git a/drivers/mmc/tegra_mmc.c b/drivers/mmc/tegra_mmc.c
index 73ac58c..03110ba 100644
--- a/drivers/mmc/tegra_mmc.c
+++ b/drivers/mmc/tegra_mmc.c
@@ -376,6 +376,24 @@ static void tegra_mmc_change_clock(struct tegra_mmc_priv *priv, uint clock)
rate = clk_set_rate(&priv->clk, clock);
div = (rate + clock - 1) / clock;
+
+#if defined(CONFIG_TEGRA210)
+ if (priv->mmc_id == PERIPH_ID_SDMMC1 && clock <= 400000) {
+ /* clock_adjust_periph_pll_div() chooses a 'bad' clock
+ * on SDMMC1 T210, so skip it here and force a clock
+ * that's been spec'd in the table in the TRM for
+ * card-detect (400KHz).
+ */
+ uint effective_rate = clock_adjust_periph_pll_div(priv->mmc_id,
+ CLOCK_ID_PERIPH, 24727273, NULL);
+ div = 62;
+
+ debug("%s: WAR: Using SDMMC1 clock of %u, div %d to achieve %dHz card clock ...\n",
+ __func__, effective_rate, div, clock);
+ } else
+ clock_adjust_periph_pll_div(priv->mmc_id, CLOCK_ID_PERIPH, clock,
+ &div);
+#endif
debug("div = %d\n", div);
writew(0, &priv->reg->clkcon);
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