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authorArnaud Patard <apatard@mandriva.com>2010-04-29 11:58:54 +0200
committerRalf Baechle <ralf@linux-mips.org>2010-05-21 21:31:16 +0100
commitc197da9163a42e6faeb051f331868b9245836eef (patch)
treef0f29266fd2610bb061b9650e851a26cf6548086 /arch/mips
parent96d660c482e03b2d7b6c0245b95a7cce537606c8 (diff)
downloadlinux-2.6.34-ux500-c197da9163a42e6faeb051f331868b9245836eef.tar.gz
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>
Diffstat (limited to 'arch/mips')
-rw-r--r--arch/mips/Kconfig2
-rw-r--r--arch/mips/include/asm/mach-loongson/gpio.h35
-rw-r--r--arch/mips/loongson/common/Makefile1
-rw-r--r--arch/mips/loongson/common/gpio.c139
4 files changed, 177 insertions, 0 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 7e6fd1cbd3f..cdaae942623 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 00000000000..e30e73d443d
--- /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 7668c4de115..cdd2e812ba1 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 00000000000..e8a0ffa935b
--- /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);