EXYNOS5: PINMUX: Added default pinumx settings

This patch performs the pinmux configuration in a common file.
As of now only EXYNOS5 pinmux for SDMMC, UART and Ethernet is
supported.

Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com>
Signed-off-by: Che-Liang Chiou <clchiou@chromium.org>
Signed-off-by: Rajeshwari Shinde <rajeshwari.s@samsung.com>
Acked-by: Chander Kashyap <chander.kashyap@linaro.org>
Acked-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

4 files changed, 326 insertions, 1 deletions

diff --git a/arch/arm/cpu/armv7/exynos/Makefile b/arch/arm/cpu/armv7/exynos/Makefile
index 90ec2bd404..9119961d95 100644
--- a/arch/arm/cpu/armv7/exynos/Makefile
+++ b/arch/arm/cpu/armv7/exynos/Makefile
@@ -22,7 +22,7 @@ include $(TOPDIR)/config.mk
 
 LIB	= $(obj)lib$(SOC).o
 
-COBJS	+= clock.o power.o soc.o system.o
+COBJS	+= clock.o power.o soc.o system.o pinmux.o
 
 SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(COBJS) $(SOBJS))
diff --git a/arch/arm/cpu/armv7/exynos/pinmux.c b/arch/arm/cpu/armv7/exynos/pinmux.c
new file mode 100644
index 0000000000..d2b7d2cba7
--- /dev/null
+++ b/arch/arm/cpu/armv7/exynos/pinmux.c
@@ -0,0 +1,220 @@
+/*
+ * Copyright (c) 2012 Samsung Electronics.
+ * Abhilash Kesavan <a.kesavan@samsung.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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 <asm/arch/gpio.h>
+#include <asm/arch/pinmux.h>
+#include <asm/arch/sromc.h>
+
+static void exynos5_uart_config(int peripheral)
+{
+	struct exynos5_gpio_part1 *gpio1 =
+		(struct exynos5_gpio_part1 *) samsung_get_base_gpio_part1();
+	struct s5p_gpio_bank *bank;
+	int i, start, count;
+
+	switch (peripheral) {
+	case PERIPH_ID_UART0:
+		bank = &gpio1->a0;
+		start = 0;
+		count = 4;
+		break;
+	case PERIPH_ID_UART1:
+		bank = &gpio1->a0;
+		start = 4;
+		count = 4;
+		break;
+	case PERIPH_ID_UART2:
+		bank = &gpio1->a1;
+		start = 0;
+		count = 4;
+		break;
+	case PERIPH_ID_UART3:
+		bank = &gpio1->a1;
+		start = 4;
+		count = 2;
+		break;
+	}
+	for (i = start; i < start + count; i++) {
+		s5p_gpio_set_pull(bank, i, GPIO_PULL_NONE);
+		s5p_gpio_cfg_pin(bank, i, GPIO_FUNC(0x2));
+	}
+}
+
+static int exynos5_mmc_config(int peripheral, int flags)
+{
+	struct exynos5_gpio_part1 *gpio1 =
+		(struct exynos5_gpio_part1 *) samsung_get_base_gpio_part1();
+	struct s5p_gpio_bank *bank, *bank_ext;
+	int i;
+
+	switch (peripheral) {
+	case PERIPH_ID_SDMMC0:
+		bank = &gpio1->c0;
+		bank_ext = &gpio1->c1;
+		break;
+	case PERIPH_ID_SDMMC1:
+		bank = &gpio1->c1;
+		bank_ext = NULL;
+		break;
+	case PERIPH_ID_SDMMC2:
+		bank = &gpio1->c2;
+		bank_ext = &gpio1->c3;
+		break;
+	case PERIPH_ID_SDMMC3:
+		bank = &gpio1->c3;
+		bank_ext = NULL;
+		break;
+	}
+	if ((flags & PINMUX_FLAG_8BIT_MODE) && !bank_ext) {
+		debug("SDMMC device %d does not support 8bit mode",
+				peripheral);
+		return -1;
+	}
+	if (flags & PINMUX_FLAG_8BIT_MODE) {
+		for (i = 3; i <= 6; i++) {
+			s5p_gpio_cfg_pin(bank_ext, i, GPIO_FUNC(0x3));
+			s5p_gpio_set_pull(bank_ext, i, GPIO_PULL_UP);
+			s5p_gpio_set_drv(bank_ext, i, GPIO_DRV_4X);
+		}
+	}
+	for (i = 0; i < 2; i++) {
+		s5p_gpio_cfg_pin(bank, i, GPIO_FUNC(0x2));
+		s5p_gpio_set_pull(bank, i, GPIO_PULL_NONE);
+		s5p_gpio_set_drv(bank, i, GPIO_DRV_4X);
+	}
+	for (i = 3; i <= 6; i++) {
+		s5p_gpio_cfg_pin(bank, i, GPIO_FUNC(0x2));
+		s5p_gpio_set_pull(bank, i, GPIO_PULL_UP);
+		s5p_gpio_set_drv(bank, i, GPIO_DRV_4X);
+	}
+	return 0;
+}
+
+static void exynos5_sromc_config(int flags)
+{
+	struct exynos5_gpio_part1 *gpio1 =
+		(struct exynos5_gpio_part1 *) samsung_get_base_gpio_part1();
+	int i;
+
+	/*
+	 * SROM:CS1 and EBI
+	 *
+	 * GPY0[0]	SROM_CSn[0]
+	 * GPY0[1]	SROM_CSn[1](2)
+	 * GPY0[2]	SROM_CSn[2]
+	 * GPY0[3]	SROM_CSn[3]
+	 * GPY0[4]	EBI_OEn(2)
+	 * GPY0[5]	EBI_EEn(2)
+	 *
+	 * GPY1[0]	EBI_BEn[0](2)
+	 * GPY1[1]	EBI_BEn[1](2)
+	 * GPY1[2]	SROM_WAIT(2)
+	 * GPY1[3]	EBI_DATA_RDn(2)
+	 */
+	s5p_gpio_cfg_pin(&gpio1->y0, (flags & PINMUX_FLAG_BANK),
+				GPIO_FUNC(2));
+	s5p_gpio_cfg_pin(&gpio1->y0, 4, GPIO_FUNC(2));
+	s5p_gpio_cfg_pin(&gpio1->y0, 5, GPIO_FUNC(2));
+
+	for (i = 0; i < 4; i++)
+		s5p_gpio_cfg_pin(&gpio1->y1, i, GPIO_FUNC(2));
+
+	/*
+	 * EBI: 8 Addrss Lines
+	 *
+	 * GPY3[0]	EBI_ADDR[0](2)
+	 * GPY3[1]	EBI_ADDR[1](2)
+	 * GPY3[2]	EBI_ADDR[2](2)
+	 * GPY3[3]	EBI_ADDR[3](2)
+	 * GPY3[4]	EBI_ADDR[4](2)
+	 * GPY3[5]	EBI_ADDR[5](2)
+	 * GPY3[6]	EBI_ADDR[6](2)
+	 * GPY3[7]	EBI_ADDR[7](2)
+	 *
+	 * EBI: 16 Data Lines
+	 *
+	 * GPY5[0]	EBI_DATA[0](2)
+	 * GPY5[1]	EBI_DATA[1](2)
+	 * GPY5[2]	EBI_DATA[2](2)
+	 * GPY5[3]	EBI_DATA[3](2)
+	 * GPY5[4]	EBI_DATA[4](2)
+	 * GPY5[5]	EBI_DATA[5](2)
+	 * GPY5[6]	EBI_DATA[6](2)
+	 * GPY5[7]	EBI_DATA[7](2)
+	 *
+	 * GPY6[0]	EBI_DATA[8](2)
+	 * GPY6[1]	EBI_DATA[9](2)
+	 * GPY6[2]	EBI_DATA[10](2)
+	 * GPY6[3]	EBI_DATA[11](2)
+	 * GPY6[4]	EBI_DATA[12](2)
+	 * GPY6[5]	EBI_DATA[13](2)
+	 * GPY6[6]	EBI_DATA[14](2)
+	 * GPY6[7]	EBI_DATA[15](2)
+	 */
+	for (i = 0; i < 8; i++) {
+		s5p_gpio_cfg_pin(&gpio1->y3, i, GPIO_FUNC(2));
+		s5p_gpio_set_pull(&gpio1->y3, i, GPIO_PULL_UP);
+
+		s5p_gpio_cfg_pin(&gpio1->y5, i, GPIO_FUNC(2));
+		s5p_gpio_set_pull(&gpio1->y5, i, GPIO_PULL_UP);
+
+		s5p_gpio_cfg_pin(&gpio1->y6, i, GPIO_FUNC(2));
+		s5p_gpio_set_pull(&gpio1->y6, i, GPIO_PULL_UP);
+	}
+}
+
+static int exynos5_pinmux_config(int peripheral, int flags)
+{
+	switch (peripheral) {
+	case PERIPH_ID_UART0:
+	case PERIPH_ID_UART1:
+	case PERIPH_ID_UART2:
+	case PERIPH_ID_UART3:
+		exynos5_uart_config(peripheral);
+		break;
+	case PERIPH_ID_SDMMC0:
+	case PERIPH_ID_SDMMC1:
+	case PERIPH_ID_SDMMC2:
+	case PERIPH_ID_SDMMC3:
+		return exynos5_mmc_config(peripheral, flags);
+	case PERIPH_ID_SROMC:
+		exynos5_sromc_config(flags);
+		break;
+	default:
+		debug("%s: invalid peripheral %d", __func__, peripheral);
+		return -1;
+	}
+
+	return 0;
+}
+
+int exynos_pinmux_config(int peripheral, int flags)
+{
+	if (cpu_is_exynos5())
+		return exynos5_pinmux_config(peripheral, flags);
+	else {
+		debug("pinmux functionality not supported\n");
+		return -1;
+	}
+}
diff --git a/arch/arm/include/asm/arch-exynos/periph.h b/arch/arm/include/asm/arch-exynos/periph.h
new file mode 100644
index 0000000000..5db25aa88a
--- /dev/null
+++ b/arch/arm/include/asm/arch-exynos/periph.h
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2012 Samsung Electronics
+ * Rajeshwari Shinde <rajeshwari.s@samsung.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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
+ */
+
+#ifndef __ASM_ARM_ARCH_PERIPH_H
+#define __ASM_ARM_ARCH_PERIPH_H
+
+/*
+ * Peripherals requiring clock/pinmux configuration. List will
+ * grow with support for more devices getting added.
+ *
+ */
+enum periph_id {
+	PERIPH_ID_SDMMC0,
+	PERIPH_ID_SDMMC1,
+	PERIPH_ID_SDMMC2,
+	PERIPH_ID_SDMMC3,
+	PERIPH_ID_SROMC,
+	PERIPH_ID_UART0,
+	PERIPH_ID_UART1,
+	PERIPH_ID_UART2,
+	PERIPH_ID_UART3,
+
+	PERIPH_ID_COUNT,
+	PERIPH_ID_NONE = -1,
+};
+
+#endif /* __ASM_ARM_ARCH_PERIPH_H */
diff --git a/arch/arm/include/asm/arch-exynos/pinmux.h b/arch/arm/include/asm/arch-exynos/pinmux.h
new file mode 100644
index 0000000000..10ea736c7d
--- /dev/null
+++ b/arch/arm/include/asm/arch-exynos/pinmux.h
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2012 Samsung Electronics
+ * Abhilash Kesavan <a.kesavan@samsung.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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
+ */
+
+#ifndef __ASM_ARM_ARCH_PINMUX_H
+#define __ASM_ARM_ARCH_PINMUX_H
+
+#include "periph.h"
+
+/*
+ * Flags for setting specific configarations of peripherals.
+ * List will grow with support for more devices getting added.
+ */
+enum {
+	PINMUX_FLAG_NONE	= 0x00000000,
+
+	/* Flags for eMMC */
+	PINMUX_FLAG_8BIT_MODE	= 1 << 0,       /* SDMMC 8-bit mode */
+
+	/* Flags for SROM controller */
+	PINMUX_FLAG_BANK	= 3 << 0,       /* bank number (0-3) */
+	PINMUX_FLAG_16BIT	= 1 << 2,       /* 16-bit width */
+};
+
+/**
+ * Configures the pinmux for a particular peripheral.
+ *
+ * Each gpio can be configured in many different ways (4 bits on exynos)
+ * such as "input", "output", "special function", "external interrupt"
+ * etc. This function will configure the peripheral pinmux along with
+ * pull-up/down and drive strength.
+ *
+ * @param peripheral	peripheral to be configured
+ * @param flags		configure flags
+ * @return 0 if ok, -1 on error (e.g. unsupported peripheral)
+ */
+int exynos_pinmux_config(int peripheral, int flags);
+
+#endif