GPIO: Add support for GPIO on CLPS711X-target platform

The CLPS711X CPUs provide some GPIOs for use in the system. This
driver provides support for these via gpiolib. Due to platform
limitations, driver does not support interrupts, only inputs and
outputs.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 73067efd484530d4021a220fecce329b4752b3c0..f456cf4ae3ca4634dc3976fddf4eeed43e3adb3a 100644 (file)
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -364,6 +364,7 @@ config ARCH_CNS3XXX
 
 config ARCH_CLPS711X
        bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"
+       select ARCH_REQUIRE_GPIOLIB
        select ARCH_USES_GETTIMEOFFSET
        select CLKDEV_LOOKUP
        select COMMON_CLK

diff --git a/arch/arm/mach-clps711x/include/mach/gpio.h b/arch/arm/mach-clps711x/include/mach/gpio.h
new file mode 100644 (file)
index 0000000..8ac6889
--- /dev/null
+++ b/arch/arm/mach-clps711x/include/mach/gpio.h
@@ -0,0 +1,13 @@
+/*
+ *  This file contains the CLPS711X GPIO definitions.
+ *
+ *  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.
+ */
+
+/* Simple helper for convert port & pin to GPIO number */
+#define CLPS711X_GPIO(port, bit)       ((port) * 8 + (bit))

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 150eeb705fbcf65c00c4381d2761f35d05ed8dc6..9e3fb3438718ee2ce49fbd14904d6e9ed3012e3f 100644 (file)
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -102,6 +102,10 @@ config GPIO_MAX730X
 
 comment "Memory mapped GPIO drivers:"
 
+config GPIO_CLPS711X
+       def_bool y
+       depends on ARCH_CLPS711X
+
 config GPIO_GENERIC_PLATFORM
        tristate "Generic memory-mapped GPIO controller support (MMIO platform device)"
        select GPIO_GENERIC

diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index e6f8e379a2ec899f6d08e60a3d761053b5cf2945..1c1b63fcaeb3e25317e401ccd50ef09325bd0f90 100644 (file)
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -16,6 +16,7 @@ obj-$(CONFIG_GPIO_ADP5588)    += gpio-adp5588.o
 obj-$(CONFIG_GPIO_AMD8111)     += gpio-amd8111.o
 obj-$(CONFIG_GPIO_ARIZONA)     += gpio-arizona.o
 obj-$(CONFIG_GPIO_BT8XX)       += gpio-bt8xx.o
+obj-$(CONFIG_GPIO_CLPS711X)    += gpio-clps711x.o
 obj-$(CONFIG_GPIO_CS5535)      += gpio-cs5535.o
 obj-$(CONFIG_GPIO_DA9052)      += gpio-da9052.o
 obj-$(CONFIG_GPIO_DA9055)      += gpio-da9055.o

diff --git a/drivers/gpio/gpio-clps711x.c b/drivers/gpio/gpio-clps711x.c
new file mode 100644 (file)
index 0000000..ea21822
--- /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");