omap: reuse omap3 gpio support in omap4

Signed-off-by: Aneesh V <aneesh@ti.com>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>

2 files changed, 177 insertions, 0 deletions

diff --git a/arch/arm/cpu/armv7/omap-common/Makefile b/arch/arm/cpu/armv7/omap-common/Makefile
index 07087964e..ea9f8ec49 100644
--- a/arch/arm/cpu/armv7/omap-common/Makefile
+++ b/arch/arm/cpu/armv7/omap-common/Makefile
@@ -29,6 +29,7 @@ SOBJS	:= reset.o
 
 COBJS	:= timer.o
 COBJS	+= utils.o
+COBJS	+= gpio.o
 
 ifdef CONFIG_SPL_BUILD
 COBJS	+= spl.o
diff --git a/arch/arm/cpu/armv7/omap-common/gpio.c b/arch/arm/cpu/armv7/omap-common/gpio.c
new file mode 100644
index 000000000..f4c347941
--- /dev/null
+++ b/arch/arm/cpu/armv7/omap-common/gpio.c
@@ -0,0 +1,176 @@
+/*
+ * Copyright (c) 2009 Wind River Systems, Inc.
+ * Tom Rix <Tom.Rix@windriver.com>
+ *
+ * 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
+ *
+ * This work is derived from the linux 2.6.27 kernel source
+ * To fetch, use the kernel repository
+ * git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
+ * Use the v2.6.27 tag.
+ *
+ * Below is the original's header including its copyright
+ *
+ *  linux/arch/arm/plat-omap/gpio.c
+ *
+ * Support functions for OMAP GPIO
+ *
+ * Copyright (C) 2003-2005 Nokia Corporation
+ * Written by Juha Yrjölä <juha.yrjola@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <common.h>
+#include <asm/omap_gpio.h>
+#include <asm/io.h>
+#include <asm/errno.h>
+
+static inline const struct gpio_bank *get_gpio_bank(int gpio)
+{
+	return &omap_gpio_bank[gpio >> 5];
+}
+
+static inline int get_gpio_index(int gpio)
+{
+	return gpio & 0x1f;
+}
+
+static inline int gpio_valid(int gpio)
+{
+	if (gpio < 0)
+		return -1;
+	if (gpio < 192)
+		return 0;
+	return -1;
+}
+
+static int check_gpio(int gpio)
+{
+	if (gpio_valid(gpio) < 0) {
+		printf("ERROR : check_gpio: invalid GPIO %d\n", gpio);
+		return -1;
+	}
+	return 0;
+}
+
+static void _set_gpio_direction(const struct gpio_bank *bank, int gpio,
+				int is_input)
+{
+	void *reg = bank->base;
+	u32 l;
+
+	switch (bank->method) {
+	case METHOD_GPIO_24XX:
+		reg += OMAP_GPIO_OE;
+		break;
+	default:
+		return;
+	}
+	l = __raw_readl(reg);
+	if (is_input)
+		l |= 1 << gpio;
+	else
+		l &= ~(1 << gpio);
+	__raw_writel(l, reg);
+}
+
+void omap_set_gpio_direction(int gpio, int is_input)
+{
+	const struct gpio_bank *bank;
+
+	if (check_gpio(gpio) < 0)
+		return;
+	bank = get_gpio_bank(gpio);
+	_set_gpio_direction(bank, get_gpio_index(gpio), is_input);
+}
+
+static void _set_gpio_dataout(const struct gpio_bank *bank, int gpio,
+				int enable)
+{
+	void *reg = bank->base;
+	u32 l = 0;
+
+	switch (bank->method) {
+	case METHOD_GPIO_24XX:
+		if (enable)
+			reg += OMAP_GPIO_SETDATAOUT;
+		else
+			reg += OMAP_GPIO_CLEARDATAOUT;
+		l = 1 << gpio;
+		break;
+	default:
+		printf("omap3-gpio unknown bank method %s %d\n",
+		       __FILE__, __LINE__);
+		return;
+	}
+	__raw_writel(l, reg);
+}
+
+void omap_set_gpio_dataout(int gpio, int enable)
+{
+	const struct gpio_bank *bank;
+
+	if (check_gpio(gpio) < 0)
+		return;
+	bank = get_gpio_bank(gpio);
+	_set_gpio_dataout(bank, get_gpio_index(gpio), enable);
+}
+
+int omap_get_gpio_datain(int gpio)
+{
+	const struct gpio_bank *bank;
+	void *reg;
+
+	if (check_gpio(gpio) < 0)
+		return -EINVAL;
+	bank = get_gpio_bank(gpio);
+	reg = bank->base;
+	switch (bank->method) {
+	case METHOD_GPIO_24XX:
+		reg += OMAP_GPIO_DATAIN;
+		break;
+	default:
+		return -EINVAL;
+	}
+	return (__raw_readl(reg)
+			& (1 << get_gpio_index(gpio))) != 0;
+}
+
+static void _reset_gpio(const struct gpio_bank *bank, int gpio)
+{
+	_set_gpio_direction(bank, get_gpio_index(gpio), 1);
+}
+
+int omap_request_gpio(int gpio)
+{
+	if (check_gpio(gpio) < 0)
+		return -EINVAL;
+
+	return 0;
+}
+
+void omap_free_gpio(int gpio)
+{
+	const struct gpio_bank *bank;
+
+	if (check_gpio(gpio) < 0)
+		return;
+	bank = get_gpio_bank(gpio);
+
+	_reset_gpio(bank, gpio);
+}