[PATCH 04/13] arm omap: Add gpio support
Michael Grzeschik
m.grzeschik at pengutronix.de
Wed Aug 4 05:59:08 EDT 2010
From: Sascha Hauer <s.hauer at pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
---
arch/arm/mach-omap/Kconfig | 15 ++-
arch/arm/mach-omap/Makefile | 1 +
arch/arm/mach-omap/gpio.c | 206 ++++++++++++++++++++++++++++++++
arch/arm/mach-omap/include/mach/gpio.h | 92 ++++++++++++++
4 files changed, 311 insertions(+), 3 deletions(-)
create mode 100644 arch/arm/mach-omap/gpio.c
create mode 100644 arch/arm/mach-omap/include/mach/gpio.h
diff --git a/arch/arm/mach-omap/Kconfig b/arch/arm/mach-omap/Kconfig
index 158639e..630405b 100644
--- a/arch/arm/mach-omap/Kconfig
+++ b/arch/arm/mach-omap/Kconfig
@@ -78,9 +78,18 @@ config GPMC
depends on (ARCH_OMAP2 || ARCH_OMAP3)
default y
help
- Enable this if you use Texas Instrument's General purpose Memory
- Controller(GPMC). GPMC allows you to configure devices such as NOR,
- NAND, OneNAND etc.
+ Enable this if you use Texas Instrument's General purpose Memory
+ Controller(GPMC). GPMC allows you to configure devices such as NOR,
+ NAND, OneNAND etc.
+
+config GPIO
+ prompt "Support for GPIO configuration"
+ bool
+ select GENERIC_GPIO
+ depends on (ARCH_OMAP2 || ARCH_OMAP3)
+ default y
+ help
+ Enable this if you use Texas Instrument's General Purpose IO
# Get the board specific configurations
source arch/arm/boards/omap/Kconfig
diff --git a/arch/arm/mach-omap/Makefile b/arch/arm/mach-omap/Makefile
index f672dce..57bab99 100644
--- a/arch/arm/mach-omap/Makefile
+++ b/arch/arm/mach-omap/Makefile
@@ -24,3 +24,4 @@ obj-$(CONFIG_OMAP_CLOCK_SOURCE_S32K) += s32k_clksource.o
obj-$(CONFIG_ARCH_OMAP3) += omap3_core.o omap3_generic.o
obj-$(CONFIG_OMAP3_CLOCK_CONFIG) += omap3_clock_core.o omap3_clock.o
obj-$(CONFIG_GPMC) += gpmc.o
+obj-$(CONFIG_GPIO) += gpio.o
diff --git a/arch/arm/mach-omap/gpio.c b/arch/arm/mach-omap/gpio.c
new file mode 100644
index 0000000..240ac8e
--- /dev/null
+++ b/arch/arm/mach-omap/gpio.c
@@ -0,0 +1,206 @@
+/*
+ * Copyright (c) 2009 Wind River Systems, Inc.
+ * Tom Rix <Tom.Rix at 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 at 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 <mach/gpio.h>
+#include <asm/io.h>
+#include <errno.h>
+
+static struct gpio_bank gpio_bank_34xx[6] = {
+ { (void *)OMAP34XX_GPIO1_BASE, METHOD_GPIO_24XX },
+ { (void *)OMAP34XX_GPIO2_BASE, METHOD_GPIO_24XX },
+ { (void *)OMAP34XX_GPIO3_BASE, METHOD_GPIO_24XX },
+ { (void *)OMAP34XX_GPIO4_BASE, METHOD_GPIO_24XX },
+ { (void *)OMAP34XX_GPIO5_BASE, METHOD_GPIO_24XX },
+ { (void *)OMAP34XX_GPIO6_BASE, METHOD_GPIO_24XX },
+};
+
+static struct gpio_bank *gpio_bank = &gpio_bank_34xx[0];
+
+static inline struct gpio_bank *get_gpio_bank(int gpio)
+{
+ return &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;
+}
+
+void gpio_set_value(unsigned gpio, int value)
+{
+ struct gpio_bank *bank;
+ void *reg;
+ u32 l = 0;
+
+ if (check_gpio(gpio) < 0)
+ return;
+ bank = get_gpio_bank(gpio);
+ reg = bank->base;
+
+ switch (bank->method) {
+ case METHOD_GPIO_24XX:
+ if (value)
+ reg += OMAP24XX_GPIO_SETDATAOUT;
+ else
+ reg += OMAP24XX_GPIO_CLEARDATAOUT;
+ l = 1 << get_gpio_index(gpio);
+ break;
+ default:
+ printf("omap3-gpio unknown bank method %s %d\n",
+ __FILE__, __LINE__);
+ return;
+ }
+ __raw_writel(l, reg);
+}
+
+int gpio_direction_input(unsigned gpio)
+{
+ struct gpio_bank *bank;
+ void *reg;
+ u32 val;
+
+ if (check_gpio(gpio) < 0)
+ return -EINVAL;
+ bank = get_gpio_bank(gpio);
+
+ reg = bank->base;
+
+ switch (bank->method) {
+ case METHOD_GPIO_24XX:
+ reg += OMAP24XX_GPIO_OE;
+ break;
+ default:
+ return -EINVAL;
+ }
+ val = __raw_readl(reg);
+ val |= 1 << get_gpio_index(gpio);
+ __raw_writel(val, reg);
+
+ return 0;
+}
+
+int gpio_direction_output(unsigned gpio, int value)
+{
+ struct gpio_bank *bank;
+ void *reg;
+ u32 val;
+
+ if (check_gpio(gpio) < 0)
+ return -EINVAL;
+ bank = get_gpio_bank(gpio);
+
+ reg = bank->base;
+
+ gpio_set_value(gpio, value);
+
+ switch (bank->method) {
+ case METHOD_GPIO_24XX:
+ reg += OMAP24XX_GPIO_OE;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ val = __raw_readl(reg);
+ val &= ~(1 << get_gpio_index(gpio));
+ __raw_writel(val, reg);
+
+ return 0;
+}
+
+int gpio_get_value(unsigned gpio)
+{
+ 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 += OMAP24XX_GPIO_DATAIN;
+ break;
+ default:
+ return -EINVAL;
+ }
+ return (__raw_readl(reg)
+ & (1 << get_gpio_index(gpio))) != 0;
+}
+
+static void _reset_gpio(int gpio)
+{
+ gpio_direction_input(gpio);
+}
+
+int omap_request_gpio(int gpio)
+{
+ if (check_gpio(gpio) < 0)
+ return -EINVAL;
+
+ return 0;
+}
+
+void omap_free_gpio(int gpio)
+{
+ struct gpio_bank *bank;
+
+ if (check_gpio(gpio) < 0)
+ return;
+ bank = get_gpio_bank(gpio);
+
+ _reset_gpio(gpio);
+}
diff --git a/arch/arm/mach-omap/include/mach/gpio.h b/arch/arm/mach-omap/include/mach/gpio.h
new file mode 100644
index 0000000..9840b6e
--- /dev/null
+++ b/arch/arm/mach-omap/include/mach/gpio.h
@@ -0,0 +1,92 @@
+/*
+ * Copyright (c) 2009 Wind River Systems, Inc.
+ * Tom Rix <Tom.Rix at 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 at 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.
+ */
+#ifndef _GPIO_H
+#define _GPIO_H
+
+#define OMAP24XX_GPIO_REVISION 0x0000
+#define OMAP24XX_GPIO_SYSCONFIG 0x0010
+#define OMAP24XX_GPIO_SYSSTATUS 0x0014
+#define OMAP24XX_GPIO_IRQSTATUS1 0x0018
+#define OMAP24XX_GPIO_IRQSTATUS2 0x0028
+#define OMAP24XX_GPIO_IRQENABLE2 0x002c
+#define OMAP24XX_GPIO_IRQENABLE1 0x001c
+#define OMAP24XX_GPIO_WAKE_EN 0x0020
+#define OMAP24XX_GPIO_CTRL 0x0030
+#define OMAP24XX_GPIO_OE 0x0034
+#define OMAP24XX_GPIO_DATAIN 0x0038
+#define OMAP24XX_GPIO_DATAOUT 0x003c
+#define OMAP24XX_GPIO_LEVELDETECT0 0x0040
+#define OMAP24XX_GPIO_LEVELDETECT1 0x0044
+#define OMAP24XX_GPIO_RISINGDETECT 0x0048
+#define OMAP24XX_GPIO_FALLINGDETECT 0x004c
+#define OMAP24XX_GPIO_DEBOUNCE_EN 0x0050
+#define OMAP24XX_GPIO_DEBOUNCE_VAL 0x0054
+#define OMAP24XX_GPIO_CLEARIRQENABLE1 0x0060
+#define OMAP24XX_GPIO_SETIRQENABLE1 0x0064
+#define OMAP24XX_GPIO_CLEARWKUENA 0x0080
+#define OMAP24XX_GPIO_SETWKUENA 0x0084
+#define OMAP24XX_GPIO_CLEARDATAOUT 0x0090
+#define OMAP24XX_GPIO_SETDATAOUT 0x0094
+
+struct gpio_bank {
+ void *base;
+ int method;
+};
+
+/* OMAP3 GPIO registers */
+#define OMAP34XX_GPIO1_BASE 0x48310000
+#define OMAP34XX_GPIO2_BASE 0x49050000
+#define OMAP34XX_GPIO3_BASE 0x49052000
+#define OMAP34XX_GPIO4_BASE 0x49054000
+#define OMAP34XX_GPIO5_BASE 0x49056000
+#define OMAP34XX_GPIO6_BASE 0x49058000
+
+#define METHOD_GPIO_24XX 4
+
+/* This is the interface */
+
+/* Request a gpio before using it */
+int omap_request_gpio(int gpio);
+/* Reset and free a gpio after using it */
+void omap_free_gpio(int gpio);
+void gpio_set_value(unsigned gpio, int value);
+int gpio_get_value(unsigned gpio);
+int gpio_direction_output(unsigned gpio, int value);
+int gpio_direction_input(unsigned gpio);
+
+#endif /* _GPIO_H_ */
--
1.7.1
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