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path: root/drivers/gpio/gpio-iop.c
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Diffstat (limited to 'drivers/gpio/gpio-iop.c')
-rw-r--r--drivers/gpio/gpio-iop.c130
1 files changed, 130 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-iop.c b/drivers/gpio/gpio-iop.c
new file mode 100644
index 000000000000..c22a61be3a9c
--- /dev/null
+++ b/drivers/gpio/gpio-iop.c
@@ -0,0 +1,130 @@
+/*
+ * arch/arm/plat-iop/gpio.c
+ * GPIO handling for Intel IOP3xx processors.
+ *
+ * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
+ *
+ * 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/device.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/gpio.h>
+#include <linux/export.h>
+#include <linux/platform_device.h>
+#include <linux/bitops.h>
+#include <linux/io.h>
+
+#define IOP3XX_N_GPIOS 8
+
+#define GPIO_IN 0
+#define GPIO_OUT 1
+#define GPIO_LOW 0
+#define GPIO_HIGH 1
+
+/* Memory base offset */
+static void __iomem *base;
+
+#define IOP3XX_GPIO_REG(reg) (base + (reg))
+#define IOP3XX_GPOE IOP3XX_GPIO_REG(0x0000)
+#define IOP3XX_GPID IOP3XX_GPIO_REG(0x0004)
+#define IOP3XX_GPOD IOP3XX_GPIO_REG(0x0008)
+
+static void gpio_line_config(int line, int direction)
+{
+ unsigned long flags;
+ u32 val;
+
+ local_irq_save(flags);
+ val = readl(IOP3XX_GPOE);
+ if (direction == GPIO_IN) {
+ val |= BIT(line);
+ } else if (direction == GPIO_OUT) {
+ val &= ~BIT(line);
+ }
+ writel(val, IOP3XX_GPOE);
+ local_irq_restore(flags);
+}
+
+static int gpio_line_get(int line)
+{
+ return !!(readl(IOP3XX_GPID) & BIT(line));
+}
+
+static void gpio_line_set(int line, int value)
+{
+ unsigned long flags;
+ u32 val;
+
+ local_irq_save(flags);
+ val = readl(IOP3XX_GPOD);
+ if (value == GPIO_LOW) {
+ val &= ~BIT(line);
+ } else if (value == GPIO_HIGH) {
+ val |= BIT(line);
+ }
+ writel(val, IOP3XX_GPOD);
+ local_irq_restore(flags);
+}
+
+static int iop3xx_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
+{
+ gpio_line_config(gpio, GPIO_IN);
+ return 0;
+}
+
+static int iop3xx_gpio_direction_output(struct gpio_chip *chip, unsigned gpio, int level)
+{
+ gpio_line_set(gpio, level);
+ gpio_line_config(gpio, GPIO_OUT);
+ return 0;
+}
+
+static int iop3xx_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
+{
+ return gpio_line_get(gpio);
+}
+
+static void iop3xx_gpio_set_value(struct gpio_chip *chip, unsigned gpio, int value)
+{
+ gpio_line_set(gpio, value);
+}
+
+static struct gpio_chip iop3xx_chip = {
+ .label = "iop3xx",
+ .direction_input = iop3xx_gpio_direction_input,
+ .get = iop3xx_gpio_get_value,
+ .direction_output = iop3xx_gpio_direction_output,
+ .set = iop3xx_gpio_set_value,
+ .base = 0,
+ .ngpio = IOP3XX_N_GPIOS,
+};
+
+static int iop3xx_gpio_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ base = devm_ioremap_resource(&pdev->dev, res);
+
+ return gpiochip_add(&iop3xx_chip);
+}
+
+static struct platform_driver iop3xx_gpio_driver = {
+ .driver = {
+ .name = "gpio-iop",
+ .owner = THIS_MODULE,
+ },
+ .probe = iop3xx_gpio_probe,
+};
+
+static int __init iop3xx_gpio_init(void)
+{
+ return platform_driver_register(&iop3xx_gpio_driver);
+}
+arch_initcall(iop3xx_gpio_init);