[ARM] 5160/1: IOP3XX: gpio/gpiolib support

This patch brings support for gpio/gpiolib framework to Intel IOP3xx
platforms.

Signed-off-by: Arnaud Patard <arnaud.patard@rtp-net.org>
Acked-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

5 files changed, 132 insertions, 0 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index b786e68914d4..63ef7cf852a7 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -299,6 +299,8 @@ config ARCH_IOP32X
         depends on MMU
         select PLAT_IOP
         select PCI
+        select GENERIC_GPIO
+        select HAVE_GPIO_LIB
         help
           Support for Intel's 80219 and IOP32X (XScale) family of
           processors.
@@ -308,6 +310,8 @@ config ARCH_IOP33X
         depends on MMU
         select PLAT_IOP
         select PCI
+        select GENERIC_GPIO
+        select HAVE_GPIO_LIB
         help
           Support for Intel's IOP33X (XScale) family of processors.
 
diff --git a/arch/arm/plat-iop/gpio.c b/arch/arm/plat-iop/gpio.c
index eda436083417..640e498c12ef 100644
--- a/arch/arm/plat-iop/gpio.c
+++ b/arch/arm/plat-iop/gpio.c
@@ -11,6 +11,10 @@
  */
 
 #include <linux/device.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/gpio.h>
 #include <asm/hardware/iop3xx.h>
 
 void gpio_line_config(int line, int direction)
@@ -46,3 +50,42 @@ void gpio_line_set(int line, int value)
         local_irq_restore(flags);
 }
 EXPORT_SYMBOL(gpio_line_set);
+
+static int iop3xx_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
+{
+        gpio_line_config(gpio, GPIO_IN);
+        return 0;
+}
+
+static int iop3xx_gpio_direction_output(struct gpio_chip *chip, unsigned gpio, int level)
+{
+        gpio_line_set(gpio, level);
+        gpio_line_config(gpio, GPIO_OUT);
+        return 0;
+}
+
+static int iop3xx_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
+{
+        return gpio_line_get(gpio);
+}
+
+static void iop3xx_gpio_set_value(struct gpio_chip *chip, unsigned gpio, int value)
+{
+        gpio_line_set(gpio, value);
+}
+
+static struct gpio_chip iop3xx_chip = {
+        .label                  = "iop3xx",
+        .direction_input        = iop3xx_gpio_direction_input,
+        .get                    = iop3xx_gpio_get_value,
+        .direction_output       = iop3xx_gpio_direction_output,
+        .set                    = iop3xx_gpio_set_value,
+        .base                   = 0,
+        .ngpio                  = IOP3XX_N_GPIOS,
+};
+
+static int __init iop3xx_gpio_setup(void)
+{
+        return gpiochip_add(&iop3xx_chip);
+}
+arch_initcall(iop3xx_gpio_setup);
diff --git a/include/asm-arm/arch-iop32x/gpio.h b/include/asm-arm/arch-iop32x/gpio.h
new file mode 100644
index 000000000000..708f4ec9db1d
--- /dev/null
+++ b/include/asm-arm/arch-iop32x/gpio.h
@@ -0,0 +1,6 @@
+#ifndef __ASM_ARCH_IOP32X_GPIO_H
+#define __ASM_ARCH_IOP32X_GPIO_H
+
+#include <asm/hardware/iop3xx-gpio.h>
+
+#endif
diff --git a/include/asm-arm/arch-iop33x/gpio.h b/include/asm-arm/arch-iop33x/gpio.h
new file mode 100644
index 000000000000..ddd55bba9bb9
--- /dev/null
+++ b/include/asm-arm/arch-iop33x/gpio.h
@@ -0,0 +1,6 @@
+#ifndef __ASM_ARCH_IOP33X_GPIO_H
+#define __ASM_ARCH_IOP33X_GPIO_H
+
+#include <asm/hardware/iop3xx-gpio.h>
+
+#endif
diff --git a/include/asm-arm/hardware/iop3xx-gpio.h b/include/asm-arm/hardware/iop3xx-gpio.h
new file mode 100644
index 000000000000..0c9331f9ac24
--- /dev/null
+++ b/include/asm-arm/hardware/iop3xx-gpio.h
@@ -0,0 +1,73 @@
+/*
+ * linux/include/asm-arm/hardware/iop3xx-gpio.h
+ *
+ * IOP3xx GPIO wrappers
+ *
+ * Copyright (c) 2008 Arnaud Patard <arnaud.patard@rtp-net.org>
+ * Based on IXP4XX gpio.h file
+ *
+ * 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_HARDWARE_IOP3XX_GPIO_H
+#define __ASM_ARM_HARDWARE_IOP3XX_GPIO_H
+
+#include <asm/hardware.h>
+#include <asm-generic/gpio.h>
+
+#define IOP3XX_N_GPIOS  8
+
+static inline int gpio_get_value(unsigned gpio)
+{
+        if (gpio > IOP3XX_N_GPIOS)
+                return __gpio_get_value(gpio);
+
+        return gpio_line_get(gpio);
+}
+
+static inline void gpio_set_value(unsigned gpio, int value)
+{
+        if (gpio > IOP3XX_N_GPIOS) {
+                __gpio_set_value(gpio, value);
+                return;
+        }
+        gpio_line_set(gpio, value);
+}
+
+static inline int gpio_cansleep(unsigned gpio)
+{
+        if (gpio < IOP3XX_N_GPIOS)
+                return 0;
+        else
+                return __gpio_cansleep(gpio);
+}
+
+/*
+ * The GPIOs are not generating any interrupt
+ * Note : manuals are not clear about this
+ */
+static inline int gpio_to_irq(int gpio)
+{
+        return -EINVAL;
+}
+
+static inline int irq_to_gpio(int gpio)
+{
+        return -EINVAL;
+}
+
+#endif
+