[U-Boot] [PATCH v2 3/6] Tegra30: MMC: Add SD bus power-rail and SDMMC pad init routines

[Tom Warren <twarren.nvidia@gmail.com>]

T30 requires specific SDMMC pad programming, and bus power-rail bringup.

Signed-off-by: Tom Warren <twarren@nvidia.com>
---
v2:
- rewrite pad_init_mmc to use mmc_id instead of SDMMC base address
- add PMU-specific comments to board_sdmmc_voltage_init sequence

 board/nvidia/cardhu/cardhu.c |   51 ++++++++++++++++++++++++++++++++++++++
 board/nvidia/common/board.c  |   55 +++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 105 insertions(+), 1 deletions(-)

diff --git a/board/nvidia/cardhu/cardhu.c b/board/nvidia/cardhu/cardhu.c
index df4cb6b..1889998 100644
--- a/board/nvidia/cardhu/cardhu.c
+++ b/board/nvidia/cardhu/cardhu.c
@@ -24,6 +24,10 @@
 #include <common.h>
 #include <asm/arch/pinmux.h>
 #include "pinmux-config-cardhu.h"
+#include <i2c.h>
+
+#define PMU_I2C_ADDRESS		0x2D
+#define MAX_I2C_RETRY		3
 
 /*
  * Routine: pinmux_init
@@ -37,3 +41,50 @@ void pinmux_init(void)
 	pinmux_config_table(unused_pins_lowpower,
 		ARRAY_SIZE(unused_pins_lowpower));
 }
+
+#if defined(CONFIG_TEGRA_MMC)
+/*
+ * Do I2C/PMU writes to bring up SD card bus power
+ *
+ */
+void board_sdmmc_voltage_init(void)
+{
+	uchar reg, data_buffer[1];
+	int i;
+
+	i2c_set_bus_num(0);	/* PMU is on bus 0 */
+
+	/* TPS659110: LDO5_REG = 3.3v, ACTIVE to SDMMC1 */
+	data_buffer[0] = 0x65;
+	reg = 0x32;
+
+	for (i = 0; i < MAX_I2C_RETRY; ++i) {
+		if (i2c_write(PMU_I2C_ADDRESS, reg, 1, data_buffer, 1))
+			udelay(100);
+	}
+
+	/* TPS659110: GPIO7_REG = PDEN, output a 1 to EN_3V3_SYS */
+	data_buffer[0] = 0x09;
+	reg = 0x67;
+
+	for (i = 0; i < MAX_I2C_RETRY; ++i) {
+		if (i2c_write(PMU_I2C_ADDRESS, reg, 1, data_buffer, 1))
+			udelay(100);
+	}
+}
+
+/*
+ * Routine: pin_mux_mmc
+ * Description: setup the MMC muxes, power rails, etc.
+ */
+void pin_mux_mmc(void)
+{
+	/*
+	 * NOTE: We don't do mmc-specific pin muxes here.
+	 * They were done globally in pinmux_init().
+	 */
+
+	/* Bring up the SDIO1 power rail */
+	board_sdmmc_voltage_init();
+}
+#endif	/* MMC */
diff --git a/board/nvidia/common/board.c b/board/nvidia/common/board.c
index babbe08..8c9040d 100644
--- a/board/nvidia/common/board.c
+++ b/board/nvidia/common/board.c
@@ -49,6 +49,8 @@
 #include <asm/arch-tegra/usb.h>
 #endif
 #ifdef CONFIG_TEGRA_MMC
+#include <asm/arch/gp_padctrl.h>
+#include <asm/arch-tegra/tegra_mmc.h>
 #include <asm/arch-tegra/mmc.h>
 #endif
 #include <i2c.h>
@@ -245,4 +247,55 @@ int board_mmc_init(bd_t *bd)
 
 	return 0;
 }
-#endif
+
+void pad_init_mmc(struct mmc_host *host)
+{
+#if defined(CONFIG_TEGRA30)
+	struct apb_misc_gp_ctlr *const gpc =
+		(struct apb_misc_gp_ctlr *)NV_PA_APB_MISC_GP_BASE;
+	enum periph_id id;
+	u32 val, padcfg, padmask;
+
+	id = host->mmc_id;
+
+	debug("%s: sdmmc address = %08x, id = %d\n", __func__,
+		(unsigned int)host->reg, id);
+
+	/* Set the pad drive strength for SDMMC1 or 3 only */
+	if (id != PERIPH_ID_SDMMC1 && id != PERIPH_ID_SDMMC3) {
+		debug("%s: settings are only valid for SDMMC1/SDMMC3!\n",
+			__func__);
+		return;
+	}
+
+	/* Set pads as per T30 TRM, section 24.6.1.2 */
+	padcfg = (GP_SDIOCFG_DRVUP_SLWF | GP_SDIOCFG_DRVDN_SLWR | \
+		GP_SDIOCFG_DRVUP | GP_SDIOCFG_DRVDN);
+	padmask = 0x00000FFF;
+
+	if (id == PERIPH_ID_SDMMC1) {
+		val = readl(&gpc->sdio1cfg);
+		val &= padmask;
+		val |= padcfg;
+		writel(val, &gpc->sdio1cfg);
+		debug(" wrote 0x%08X to %p\n", val, &gpc->sdio1cfg);
+	} else {
+		val = readl(&gpc->sdio3cfg);
+		val &= padmask;
+		val |= padcfg;
+		writel(val, &gpc->sdio3cfg);
+		debug(" wrote 0x%08X to %p\n", val, &gpc->sdio3cfg);
+	}
+
+	val = readl(&host->reg->sdmemcmppadctl);
+	val &= 0xFFFFFFF0;
+	val |= MEMCOMP_PADCTRL_VREF;
+	writel(val, &host->reg->sdmemcmppadctl);
+
+	val = readl(&host->reg->autocalcfg);
+	val &= 0xFFFF0000;
+	val |= AUTO_CAL_PU_OFFSET | AUTO_CAL_PD_OFFSET | AUTO_CAL_ENABLED;
+	writel(val, &host->reg->autocalcfg);
+#endif	/* T30 */
+}
+#endif	/* MMC */
-- 
1.7.0.4