omap_hsmmc: setup mmc voltage on twl6030

Support the setup of the mmc voltage, when booting OMAP4 with twl6030
from nand.

Signed-off-by: Alexander Aring <a.aring@phytec.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

arch/arm/mach-omap/Makefile

@@ -26,4 +26,5 @@ obj-$(CONFIG_ARCH_OMAP4) += omap4_generic.o omap4_clock.o
 obj-$(CONFIG_OMAP3_CLOCK_CONFIG) += omap3_clock_core.o omap3_clock.o
 obj-$(CONFIG_OMAP_GPMC) += gpmc.o devices-gpmc-nand.o
 obj-$(CONFIG_SHELL_NONE) += xload.o
+obj-$(CONFIG_I2C_TWL6030) += omap4_twl6030_mmc.o
 obj-y += gpio.o

arch/arm/mach-omap/include/mach/omap4_twl6030_mmc.h

@@ -0,0 +1,14 @@
+/*
+ * Copyright (C) 2011 Alexander Aring <a.aring@phytec.de>
+ */
+
+#ifndef __OMAP4_TWL6030_MMC_H__
+#define __OMAP4_TWL6030_MMC_H__
+
+/*
+ * Sets up voltage for mmc slot.
+ */
+void set_up_mmc_voltage_omap4(void);
+
+/* __OMAP4_TWL6030_MMC_H__ */
+#endif

arch/arm/mach-omap/omap4_twl6030_mmc.c

@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2011 Alexander Aring <a.aring@phytec.de
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <io.h>
+
+#include <mci/twl6030.h>
+
+/* MMC voltage */
+#define OMAP4_CONTROL_PBIASLITE			0x4A100600
+#define OMAP4_MMC1_PBIASLITE_VMODE		(1<<21)
+#define OMAP4_MMC1_PBIASLITE_PWRDNZ		(1<<22)
+#define OMAP4_MMC1_PWRDNZ				(1<<26)
+
+void set_up_mmc_voltage_omap4(void)
+{
+	u32 value;
+
+	value = readl(OMAP4_CONTROL_PBIASLITE);
+	value &= ~(OMAP4_MMC1_PBIASLITE_PWRDNZ | OMAP4_MMC1_PWRDNZ);
+	writel(value, OMAP4_CONTROL_PBIASLITE);
+
+	twl6030_mci_power_init();
+
+	value = readl(OMAP4_CONTROL_PBIASLITE);
+	value |= (OMAP4_MMC1_PBIASLITE_VMODE | OMAP4_MMC1_PBIASLITE_PWRDNZ |
+			OMAP4_MMC1_PWRDNZ);
+	writel(value, OMAP4_CONTROL_PBIASLITE);
+}
+EXPORT_SYMBOL(set_up_mmc_voltage_omap4);

drivers/mci/Makefile

@@ -4,6 +4,7 @@ obj-$(CONFIG_MCI_S3C) += s3c.o
 obj-$(CONFIG_MCI_IMX) += imx.o
 obj-$(CONFIG_MCI_IMX_ESDHC) += imx-esdhc.o
 obj-$(CONFIG_MCI_OMAP_HSMMC) += omap_hsmmc.o
+obj-$(CONFIG_I2C_TWL6030) += twl6030.o
 obj-$(CONFIG_MCI_PXA) += pxamci.o
 obj-$(CONFIG_MCI_ATMEL) += atmel_mci.o
 obj-$(CONFIG_MCI_SPI) += mci_spi.o

drivers/mci/omap_hsmmc.c

@@ -33,6 +33,12 @@
 
 #include <mach/omap_hsmmc.h>
 
+#if defined(CONFIG_I2C_TWL6030) && \
+	defined(CONFIG_MCI_OMAP_HSMMC) && \
+	defined(CONFIG_ARCH_OMAP4)
+#include <mach/omap4_twl6030_mmc.h>
+#endif
+
 struct hsmmc {
 	unsigned char res1[0x10];
 	unsigned int sysconfig;		/* 0x10 */
@@ -215,6 +221,17 @@ static int mmc_init_setup(struct mci_host *mci, struct device_d *dev)
 	unsigned int dsor;
 	uint64_t start;
 
+/*
+ * Fix voltage for mmc, if booting from nand.
+ * It's necessary to do this here, because
+ * you need to set up this at probetime.
+ */
+#if defined(CONFIG_I2C_TWL6030) && \
+	defined(CONFIG_MCI_OMAP_HSMMC) && \
+	defined(CONFIG_ARCH_OMAP4)
+	set_up_mmc_voltage_omap4();
+#endif
+
 	writel(readl(&mmc_base->sysconfig) | MMC_SOFTRESET,
 		&mmc_base->sysconfig);
 

drivers/mci/twl6030.c

@@ -0,0 +1,29 @@
+/*
+ * MCI pmic power.
+ */
+
+#include <mfd/twl6030.h>
+#include <mci/twl6030.h>
+#include <asm/io.h>
+
+static int twl6030_mci_write(u8 address, u8 data)
+{
+	int ret;
+	struct twl6030 *twl6030 = twl6030_get();
+
+	ret = twl6030_reg_write(twl6030, address, data);
+	if (ret != 0)
+		printf("TWL6030:MCI:Write[0x%x] Error %d\n", address, ret);
+
+	return ret;
+}
+
+void twl6030_mci_power_init(void)
+{
+	twl6030_mci_write(TWL6030_PMCS_VMMC_CFG_VOLTAGE,
+			TWL6030_VMMC_VSEL_0 | TWL6030_VMMC_VSEL_2 |
+			TWL6030_VMMC_VSEL_4);
+	twl6030_mci_write(TWL6030_PMCS_VMMC_CFG_STATE,
+			TWL6030_VMMC_STATE0 | TWL6030_VMMC_GRP_APP);
+}
+