Add loongson2f GPIO interfact support. GPIOLIB needs these functions.
Signed-off-by: yajin <yajin@xxxxxxxxxxxxx>
---
arch/mips/include/asm/mach-loongson/gpio.h | 34 +++++++
arch/mips/loongson/common/Makefile | 5 +
arch/mips/loongson/common/gpio.c | 145 ++++++++++++++++++++++++++++
3 files changed, 184 insertions(+), 0 deletions(-)
create mode 100644 arch/mips/include/asm/mach-loongson/gpio.h
create mode 100644 arch/mips/loongson/common/gpio.c
diff --git a/arch/mips/include/asm/mach-loongson/gpio.h
b/arch/mips/include/asm/mach-loongson/gpio.h
new file mode 100644
index 0000000..00a7fae
--- /dev/null
+++ b/arch/mips/include/asm/mach-loongson/gpio.h
@@ -0,0 +1,34 @@
+/*
+ * STLS2F GPIO Support
+ *
+ * Copyright (c) 2008 Richard Liu, STMicroelectronics <richard.liu@xxxxxx>
+ *
+ * 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.
+ */
+
+#ifndef __STLS2F_GPIO_H
+#define __STLS2F_GPIO_H
+
+#include <asm-generic/gpio.h>
+
+extern void gpio_set_value(unsigned gpio, int value);
+extern int gpio_get_value(unsigned gpio);
+extern int gpio_cansleep(unsigned gpio);
+
+/* The chip can do interrupt
+ * but it has not been tested and doc not clear
+ */
+static inline int gpio_to_irq(int gpio)
+{
+ return -EINVAL;
+}
+
+static inline int irq_to_gpio(int gpio)
+{
+ return -EINVAL;
+}
+
+#endif /* __STLS2F_GPIO_H */
diff --git a/arch/mips/loongson/common/Makefile
b/arch/mips/loongson/common/Makefile
index 7668c4d..404dbb5 100644
--- a/arch/mips/loongson/common/Makefile
+++ b/arch/mips/loongson/common/Makefile
@@ -23,3 +23,8 @@ obj-$(CONFIG_CS5536) += cs5536/
#
obj-$(CONFIG_LOONGSON_SUSPEND) += pm.o
+
+#
+# Loongson 2f gpio
+#
+obj-$(CONFIG_GENERIC_GPIO) += gpio.o
diff --git a/arch/mips/loongson/common/gpio.c b/arch/mips/loongson/common/gpio.c
new file mode 100644
index 0000000..346418a
--- /dev/null
+++ b/arch/mips/loongson/common/gpio.c
@@ -0,0 +1,145 @@
+/*
+ * STLS2F GPIO Support
+ *
+ * Copyright(c) 2008 Richard Liu, STMicroelectronics <richard.liu@xxxxxx>
+ *
+ * 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/err.h>
+#include <linux/types.h>
+
+#include <linux/gpio.h>
+#include <loongson.h>
+
+/*
+ * North bridge of loongson 2f has 4 gpio pins.
+ * GPIO_Data: reg offset 0X1C
+ * bit [3:0] gpio_out
+ * bit [19:16] gpio_in
+ */
+#define LOONGSON_GPIO_PINS 4
+#define LOONGSON_GPIO_IN_SHIFT 16
+
+static DEFINE_SPINLOCK(gpio_lock);
+
+int gpio_get_value(unsigned gpio)
+{
+ u32 val;
+ u32 mask;
+
+ if (gpio >= LOONGSON_GPIO_PINS)
+ return __gpio_get_value(gpio);
+
+ mask = 1 << (gpio + LOONGSON_GPIO_IN_SHIFT);
+ spin_lock(&gpio_lock);
+ val = LOONGSON_GPIODATA;
+ spin_unlock(&gpio_lock);
+
+ return ((val & mask) != 0);
+}
+EXPORT_SYMBOL(gpio_get_value);
+
+void gpio_set_value(unsigned gpio, int state)
+{
+ u32 val;
+ u32 mask;
+
+ if (gpio >= LOONGSON_GPIO_PINS) {
+ __gpio_set_value(gpio, state);
+ return ;
+ }
+
+ mask = 1 << gpio;
+
+ spin_lock(&gpio_lock);
+ val = LOONGSON_GPIODATA;
+ if (state)
+ val |= mask;
+ else
+ val &= (~mask);
+ LOONGSON_GPIODATA = val;
+ spin_unlock(&gpio_lock);
+}
+EXPORT_SYMBOL(gpio_set_value);
+
+int gpio_cansleep(unsigned gpio)
+{
+ if (gpio < LOONGSON_GPIO_PINS)
+ return 0;
+ else
+ return __gpio_cansleep(gpio);
+}
+EXPORT_SYMBOL(gpio_cansleep);
+
+static int loongson_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
+{
+ u32 temp;
+ u32 mask;
+
+ if (gpio >= LOONGSON_GPIO_PINS)
+ return -EINVAL;
+
+ spin_lock(&gpio_lock);
+ mask = 1 << gpio;
+ temp = LOONGSON_GPIOIE;
+ temp |= mask;
+ LOONGSON_GPIOIE = temp;
+ spin_unlock(&gpio_lock);
+
+ return 0;
+}
+
+static int loongson_gpio_direction_output(struct gpio_chip *chip,
+ unsigned gpio, int level)
+{
+ u32 temp;
+ u32 mask;
+
+ if (gpio >= LOONGSON_GPIO_PINS)
+ return -EINVAL;
+
+ gpio_set_value(gpio, level);
+ spin_lock(&gpio_lock);
+ mask = 1 << gpio;
+ temp = LOONGSON_GPIOIE;
+ temp &= (~mask);
+ LOONGSON_GPIOIE = temp;
+ spin_unlock(&gpio_lock);
+
+ return 0;
+}
+
+static int loongson_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
+{
+ return gpio_get_value(gpio);
+}
+
+static void loongson_gpio_set_value(struct gpio_chip *chip,
+ unsigned gpio, int value)
+{
+ gpio_set_value(gpio, value);
+}
+
+static struct gpio_chip loongson_gpio_chip = {
+ .label = "loongson-gpio",
+ .direction_input = loongson_gpio_direction_input,
+ .get = loongson_gpio_get_value,
+ .direction_output = loongson_gpio_direction_output,
+ .set = loongson_gpio_set_value,
+ .base = 0,
+ .ngpio = LOONGSON_GPIO_PINS,
+};
+
+static int __init loongson_gpio_setup(void)
+{
+ return gpiochip_add(&loongson_gpio_chip);
+}
+arch_initcall(loongson_gpio_setup);
--
1.5.6.5
