MIPS: Loongson 2F: Add gpio/gpioilb support

Signed-off-by: Arnaud Patard <apatard@mandriva.com>
To: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/1163/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

4 files changed, 177 insertions, 0 deletions

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 7e6fd1cbd3f8..cdaae942623d 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -1075,6 +1075,8 @@ config CPU_LOONGSON2F
         bool "Loongson 2F"
         depends on SYS_HAS_CPU_LOONGSON2F
         select CPU_LOONGSON2
+        select GENERIC_GPIO
+        select ARCH_REQUIRE_GPIOLIB
         help
           The Loongson 2F processor implements the MIPS III instruction set
           with many extensions.
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 000000000000..e30e73d443df
--- /dev/null
+++ b/arch/mips/include/asm/mach-loongson/gpio.h
@@ -0,0 +1,35 @@
+/*
+ * STLS2F GPIO Support
+ *
+ * Copyright (c) 2008  Richard Liu, STMicroelectronics <richard.liu@st.com>
+ * Copyright (c) 2008-2010  Arnaud Patard <apatard@mandriva.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.
+ */
+
+#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 7668c4de1151..cdd2e812ba1a 100644
--- a/arch/mips/loongson/common/Makefile
+++ b/arch/mips/loongson/common/Makefile
@@ -4,6 +4,7 @@
 
 obj-y += setup.o init.o cmdline.o env.o time.o reset.o irq.o \
     pci.o bonito-irq.o mem.o machtype.o platform.o
+obj-$(CONFIG_GENERIC_GPIO) += gpio.o
 
 #
 # Serial port support
diff --git a/arch/mips/loongson/common/gpio.c b/arch/mips/loongson/common/gpio.c
new file mode 100644
index 000000000000..e8a0ffa935b4
--- /dev/null
+++ b/arch/mips/loongson/common/gpio.c
@@ -0,0 +1,139 @@
+/*
+ *  STLS2F GPIO Support
+ *
+ *  Copyright (c) 2008 Richard Liu,  STMicroelectronics  <richard.liu@st.com>
+ *  Copyright (c) 2008-2010 Arnaud Patard <apatard@mandriva.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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/err.h>
+#include <asm/types.h>
+#include <loongson.h>
+#include <linux/gpio.h>
+
+#define STLS2F_N_GPIO           4
+#define STLS2F_GPIO_IN_OFFSET   16
+
+static DEFINE_SPINLOCK(gpio_lock);
+
+int gpio_get_value(unsigned gpio)
+{
+        u32 val;
+        u32 mask;
+
+        if (gpio >= STLS2F_N_GPIO)
+                return __gpio_get_value(gpio);
+
+        mask = 1 << (gpio + STLS2F_GPIO_IN_OFFSET);
+        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 >= STLS2F_N_GPIO) {
+                __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 < STLS2F_N_GPIO)
+                return 0;
+        else
+                return __gpio_cansleep(gpio);
+}
+EXPORT_SYMBOL(gpio_cansleep);
+
+static int ls2f_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
+{
+        u32 temp;
+        u32 mask;
+
+        if (gpio >= STLS2F_N_GPIO)
+                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 ls2f_gpio_direction_output(struct gpio_chip *chip,
+                unsigned gpio, int level)
+{
+        u32 temp;
+        u32 mask;
+
+        if (gpio >= STLS2F_N_GPIO)
+                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 ls2f_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
+{
+        return gpio_get_value(gpio);
+}
+
+static void ls2f_gpio_set_value(struct gpio_chip *chip,
+                unsigned gpio, int value)
+{
+        gpio_set_value(gpio, value);
+}
+
+static struct gpio_chip ls2f_chip = {
+        .label                  = "ls2f",
+        .direction_input        = ls2f_gpio_direction_input,
+        .get                    = ls2f_gpio_get_value,
+        .direction_output       = ls2f_gpio_direction_output,
+        .set                    = ls2f_gpio_set_value,
+        .base                   = 0,
+        .ngpio                  = STLS2F_N_GPIO,
+};
+
+static int __init ls2f_gpio_setup(void)
+{
+        return gpiochip_add(&ls2f_chip);
+}
+arch_initcall(ls2f_gpio_setup);