MIPS: Move Loongson GPIO driver to drivers/gpio

Move Loongson-2's GPIO driver to drivers/gpio and add Kconfig options.

Acked-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Huacai Chen <chenhc@lemote.com>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 105 insertions, 0 deletions

diff --git a/drivers/gpio/gpio-loongson.c b/drivers/gpio/gpio-loongson.c
new file mode 100644
index 0000000..b4e69e0
--- /dev/null
+++ b/drivers/gpio/gpio-loongson.c
@@ -0,0 +1,105 @@
+/*
+ *  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);
+
+static int ls2f_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
+{
+	u32 temp;
+	u32 mask;
+
+	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;
+
+	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)
+{
+	u32 val;
+	u32 mask;
+
+	mask = 1 << (gpio + STLS2F_GPIO_IN_OFFSET);
+	spin_lock(&gpio_lock);
+	val = LOONGSON_GPIODATA;
+	spin_unlock(&gpio_lock);
+
+	return (val & mask) != 0;
+}
+
+static void ls2f_gpio_set_value(struct gpio_chip *chip,
+		unsigned gpio, int value)
+{
+	u32 val;
+	u32 mask;
+
+	mask = 1 << gpio;
+
+	spin_lock(&gpio_lock);
+	val = LOONGSON_GPIODATA;
+	if (value)
+		val |= mask;
+	else
+		val &= (~mask);
+	LOONGSON_GPIODATA = val;
+	spin_unlock(&gpio_lock);
+}
+
+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,
+	.can_sleep		= false,
+};
+
+static int __init ls2f_gpio_setup(void)
+{
+	return gpiochip_add(&ls2f_chip);
+}
+arch_initcall(ls2f_gpio_setup);