[PATCH v4] GPIO: Add support for GPIO on CLPS711X-target platform
Alexander Shiyan
shc_work at mail.ru
Tue Oct 9 12:05:56 EDT 2012
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 at mail.ru>
---
arch/arm/Kconfig | 1 +
arch/arm/mach-clps711x/include/mach/gpio.h | 13 +++
drivers/gpio/Kconfig | 4 +
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-clps711x.c | 163 ++++++++++++++++++++++++++++
5 files changed, 182 insertions(+), 0 deletions(-)
create mode 100644 arch/arm/mach-clps711x/include/mach/gpio.h
create mode 100644 drivers/gpio/gpio-clps711x.c
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 2867a77..343b0c3 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -352,6 +352,7 @@ config ARCH_CLPS711X
bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"
select CPU_ARM720T
select ARCH_USES_GETTIMEOFFSET
+ select ARCH_REQUIRE_GPIOLIB
select COMMON_CLK
select CLKDEV_LOOKUP
select NEED_MACH_MEMORY_H
diff --git a/arch/arm/mach-clps711x/include/mach/gpio.h b/arch/arm/mach-clps711x/include/mach/gpio.h
new file mode 100644
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 at 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 d055cee..fb76140 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -91,6 +91,10 @@ 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 9aeed67..a28725e 100644
--- 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_ARCH_DAVINCI) += gpio-davinci.o
diff --git a/drivers/gpio/gpio-clps711x.c b/drivers/gpio/gpio-clps711x.c
new file mode 100644
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 at 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 at mail.ru>");
+MODULE_DESCRIPTION("CLPS711X GPIO driver");
--
1.7.8.6
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