1 files changed, 163 insertions, 0 deletions

diff --git a/drivers/gpio/gpio-clps711x.c b/drivers/gpio/gpio-clps711x.c
new file mode 100644
index 000000000000..ea21822b3de9
--- /dev/null
+++ b/drivers/gpio/gpio-clps711x.c
@@ -0,0 +1,163 @@
+/*
+ *  CLPS711X GPIO driver
+ *
+ *  Copyright (C) 2012 Alexander Shiyan <shc_work@mail.ru>
+ *
+ * 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/io.h>
+#include <linux/slab.h>
+#include <linux/gpio.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/platform_device.h>
+
+#include <mach/hardware.h>
+
+#define CLPS711X_GPIO_PORTS     5
+#define CLPS711X_GPIO_NAME      "gpio-clps711x"
+
+struct clps711x_gpio {
+        struct gpio_chip        chip[CLPS711X_GPIO_PORTS];
+        spinlock_t              lock;
+};
+
+static void __iomem *clps711x_ports[] = {
+        CLPS711X_VIRT_BASE + PADR,
+        CLPS711X_VIRT_BASE + PBDR,
+        CLPS711X_VIRT_BASE + PCDR,
+        CLPS711X_VIRT_BASE + PDDR,
+        CLPS711X_VIRT_BASE + PEDR,
+};
+
+static void __iomem *clps711x_pdirs[] = {
+        CLPS711X_VIRT_BASE + PADDR,
+        CLPS711X_VIRT_BASE + PBDDR,
+        CLPS711X_VIRT_BASE + PCDDR,
+        CLPS711X_VIRT_BASE + PDDDR,
+        CLPS711X_VIRT_BASE + PEDDR,
+};
+
+#define clps711x_port(x)        clps711x_ports[x->base / 8]
+#define clps711x_pdir(x)        clps711x_pdirs[x->base / 8]
+
+static int gpio_clps711x_get(struct gpio_chip *chip, unsigned offset)
+{
+        return !!readb(clps711x_port(chip)) & (1 << offset);
+}
+
+static void gpio_clps711x_set(struct gpio_chip *chip, unsigned offset,
+                              int value)
+{
+        int tmp;
+        unsigned long flags;
+        struct clps711x_gpio *gpio = dev_get_drvdata(chip->dev);
+
+        spin_lock_irqsave(&gpio->lock, flags);
+        tmp = readb(clps711x_port(chip)) & ~(1 << offset);
+        if (value)
+                tmp |= 1 << offset;
+        writeb(tmp, clps711x_port(chip));
+        spin_unlock_irqrestore(&gpio->lock, flags);
+}
+
+static int gpio_clps711x_direction_in(struct gpio_chip *chip, unsigned offset)
+{
+        int tmp;
+        unsigned long flags;
+        struct clps711x_gpio *gpio = dev_get_drvdata(chip->dev);
+
+        spin_lock_irqsave(&gpio->lock, flags);
+        tmp = readb(clps711x_pdir(chip)) & ~(1 << offset);
+        writeb(tmp, clps711x_pdir(chip));
+        spin_unlock_irqrestore(&gpio->lock, flags);
+
+        return 0;
+}
+
+static int gpio_clps711x_direction_out(struct gpio_chip *chip, unsigned offset,
+                                       int value)
+{
+        int tmp;
+        unsigned long flags;
+        struct clps711x_gpio *gpio = dev_get_drvdata(chip->dev);
+
+        spin_lock_irqsave(&gpio->lock, flags);
+        tmp = readb(clps711x_pdir(chip)) | (1 << offset);
+        writeb(tmp, clps711x_pdir(chip));
+        tmp = readb(clps711x_port(chip)) & ~(1 << offset);
+        if (value)
+                tmp |= 1 << offset;
+        writeb(tmp, clps711x_port(chip));
+        spin_unlock_irqrestore(&gpio->lock, flags);
+
+        return 0;
+}
+
+struct clps711x_gpio_port {
+        char    *name;
+        int     nr;
+};
+
+static const struct clps711x_gpio_port clps711x_gpio_ports[] __initconst = {
+        { "PORTA", 8, },
+        { "PORTB", 8, },
+        { "PORTC", 8, },
+        { "PORTD", 8, },
+        { "PORTE", 3, },
+};
+
+static int __init gpio_clps711x_init(void)
+{
+        int i;
+        struct platform_device *pdev;
+        struct clps711x_gpio *gpio;
+
+        pdev = platform_device_alloc(CLPS711X_GPIO_NAME, 0);
+        if (!pdev) {
+                pr_err("Cannot create platform device: %s\n",
+                       CLPS711X_GPIO_NAME);
+                return -ENOMEM;
+        }
+
+        platform_device_add(pdev);
+
+        gpio = devm_kzalloc(&pdev->dev, sizeof(struct clps711x_gpio),
+                            GFP_KERNEL);
+        if (!gpio) {
+                dev_err(&pdev->dev, "GPIO allocating memory error\n");
+                platform_device_del(pdev);
+                platform_device_put(pdev);
+                return -ENOMEM;
+        }
+
+        platform_set_drvdata(pdev, gpio);
+
+        spin_lock_init(&gpio->lock);
+
+        for (i = 0; i < CLPS711X_GPIO_PORTS; i++) {
+                gpio->chip[i].owner             = THIS_MODULE;
+                gpio->chip[i].dev               = &pdev->dev;
+                gpio->chip[i].label             = clps711x_gpio_ports[i].name;
+                gpio->chip[i].base              = i * 8;
+                gpio->chip[i].ngpio             = clps711x_gpio_ports[i].nr;
+                gpio->chip[i].direction_input   = gpio_clps711x_direction_in;
+                gpio->chip[i].get               = gpio_clps711x_get;
+                gpio->chip[i].direction_output  = gpio_clps711x_direction_out;
+                gpio->chip[i].set               = gpio_clps711x_set;
+                WARN_ON(gpiochip_add(&gpio->chip[i]));
+        }
+
+        dev_info(&pdev->dev, "GPIO driver initialized\n");
+
+        return 0;
+}
+arch_initcall(gpio_clps711x_init);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
+MODULE_DESCRIPTION("CLPS711X GPIO driver");