Added GPIO driver

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@6534 3c298f89-4303-0410-b956-a3cf2f4a3e73

2 files changed, 358 insertions, 0 deletions

diff --git a/target/linux/at91-2.6/config/default b/target/linux/at91-2.6/config/default
index cfcfe54a7b..05e6f7c38e 100644
--- a/target/linux/at91-2.6/config/default
+++ b/target/linux/at91-2.6/config/default
@@ -42,6 +42,7 @@ CONFIG_ARM_THUMB=y
 # CONFIG_AT91_PROGRAMMABLE_CLOCKS is not set
 CONFIG_AT91_SPI=y
 CONFIG_AT91_SPIDEV=y
+CONFIG_AT91_VLIO=y
 # CONFIG_ATM_DUMMY is not set
 # CONFIG_ATM_TCP is not set
 CONFIG_BASE_SMALL=0
diff --git a/target/linux/at91-2.6/patches/003-gpio-driver.patch b/target/linux/at91-2.6/patches/003-gpio-driver.patch
new file mode 100644
index 0000000000..c14542acc6
--- /dev/null
+++ b/target/linux/at91-2.6/patches/003-gpio-driver.patch
@@ -0,0 +1,357 @@
+diff -urN linux-2.6.19.2.old/arch/arm/mach-at91rm9200/gpio.c linux-2.6.19.2/arch/arm/mach-at91rm9200/gpio.c
+--- linux-2.6.19.2.old/arch/arm/mach-at91rm9200/gpio.c	2007-03-06 22:49:37.000000000 +0100
++++ linux-2.6.19.2/arch/arm/mach-at91rm9200/gpio.c	2007-03-07 10:25:41.000000000 +0100
+@@ -28,7 +28,7 @@
+ 
+ static struct at91_gpio_bank *gpio;
+ static int gpio_banks;
+-
++static u32 pio_gpio_pin[4] = { 0, 0, 0, 0 };
+ 
+ static inline void __iomem *pin_to_controller(unsigned pin)
+ {
+@@ -113,10 +113,13 @@
+ {
+ 	void __iomem	*pio = pin_to_controller(pin);
+ 	unsigned	mask = pin_to_mask(pin);
++	int bank = (pin - PIN_BASE) / 32;
+ 
+ 	if (!pio)
+ 		return -EINVAL;
+ 
++	pio_gpio_pin[bank] |= mask;
++
+ 	__raw_writel(mask, pio + PIO_IDR);
+ 	__raw_writel(mask, pio + (use_pullup ? PIO_PUER : PIO_PUDR));
+ 	__raw_writel(mask, pio + PIO_ODR);
+@@ -134,10 +137,13 @@
+ {
+ 	void __iomem	*pio = pin_to_controller(pin);
+ 	unsigned	mask = pin_to_mask(pin);
++	int bank = (pin - PIN_BASE) / 32;
+ 
+ 	if (!pio)
+ 		return -EINVAL;
+ 
++	pio_gpio_pin[bank] |= mask;
++
+ 	__raw_writel(mask, pio + PIO_IDR);
+ 	__raw_writel(mask, pio + PIO_PUDR);
+ 	__raw_writel(mask, pio + (value ? PIO_SODR : PIO_CODR));
+@@ -214,6 +220,18 @@
+ }
+ EXPORT_SYMBOL(at91_get_gpio_value);
+ 
++int at91_is_pin_gpio(unsigned pin)
++{
++  void __iomem  *pio = pin_to_controller(pin);
++  unsigned  mask = pin_to_mask(pin);
++  int     bank = (pin - PIN_BASE) / 32;
++
++  if (!pio)
++    return -EINVAL;
++  return (pio_gpio_pin[bank] & mask) != 0;
++}
++EXPORT_SYMBOL(at91_is_pin_gpio);
++
+ /*--------------------------------------------------------------------------*/
+ 
+ #ifdef CONFIG_PM
+diff -urN linux-2.6.19.2.old/drivers/char/Kconfig linux-2.6.19.2/drivers/char/Kconfig
+--- linux-2.6.19.2.old/drivers/char/Kconfig	2007-03-06 22:49:37.000000000 +0100
++++ linux-2.6.19.2/drivers/char/Kconfig	2007-03-07 01:08:57.000000000 +0100
+@@ -1064,5 +1064,12 @@
+ 	  The SPI driver gives user mode access to this serial
+ 	  bus on the AT91RM9200 processor.
+ 
++config AT91_VLIO
++  tristate "Versalink LED and GPIO interface"
++  depends on ARCH_AT91RM9200 && MACH_VLINK
++  default n
++  help
++    Provides a handler for LED and GPIO in userspace
++
+ endmenu
+ 
+diff -urN linux-2.6.19.2.old/drivers/char/Makefile linux-2.6.19.2/drivers/char/Makefile
+--- linux-2.6.19.2.old/drivers/char/Makefile	2007-03-06 22:49:37.000000000 +0100
++++ linux-2.6.19.2/drivers/char/Makefile	2007-03-07 01:08:05.000000000 +0100
+@@ -92,6 +92,7 @@
+ obj-$(CONFIG_TELCLOCK)		+= tlclk.o
+ obj-$(CONFIG_AT91_SPI)		+= at91_spi.o
+ obj-$(CONFIG_AT91_SPIDEV)	+= at91_spidev.o
++obj-$(CONFIG_AT91_VLIO)	+= vlink_giu.o
+ 
+ obj-$(CONFIG_WATCHDOG)		+= watchdog/
+ obj-$(CONFIG_MWAVE)		+= mwave/
+diff -urN linux-2.6.19.2.old/drivers/char/vlink_giu.c linux-2.6.19.2/drivers/char/vlink_giu.c
+--- linux-2.6.19.2.old/drivers/char/vlink_giu.c	1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.19.2/drivers/char/vlink_giu.c	2007-03-07 01:21:21.000000000 +0100
+@@ -0,0 +1,256 @@
++/*
++ *  Driver for FDL Versalink GPIO
++ *
++ *  Copyright (C) 2005 Guthrie Consulting
++ *	Author: Hamish Guthrie <hamish@prodigi.ch>
++ *
++ *  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.
++ *
++ *  This program is distributed in the hope that it will be useful,
++ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
++ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
++ *  GNU General Public License for more details.
++ *
++ *  You should have received a copy of the GNU General Public License
++ *  along with this program; if not, write to the Free Software
++ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
++ */
++
++#include <linux/module.h>
++#include <linux/moduleparam.h>
++#include <linux/init.h>
++#include <linux/platform_device.h>
++
++#include <linux/kernel.h>
++#include <linux/slab.h>
++#include <linux/fs.h>
++#include <linux/errno.h>
++#include <linux/init.h>
++#include <linux/types.h>
++#include <linux/proc_fs.h>
++#include <linux/fcntl.h>
++#include <linux/seq_file.h>
++#include <linux/cdev.h>
++#include <asm/arch/gpio.h>
++#include <asm/uaccess.h>
++
++static int major;	/* default is dynamic major device number */
++module_param(major, int, 0);
++MODULE_PARM_DESC(major, "Major device number");
++
++#define VIO_NR_DEVS 96
++
++struct vio_dev {
++	struct cdev cdev;
++};
++
++struct vio_dev *vio_devices;
++static struct class *vio_class;
++
++static ssize_t gpio_read(struct file *file, char __user *buf, size_t len,
++                         loff_t *ppos)
++{
++	unsigned int pin;
++	int retval;
++	char value = '0';
++
++	pin = iminor(file->f_dentry->d_inode);
++
++	retval = at91_get_gpio_value(PIN_BASE + pin);
++	if (retval < 0)
++		return -EFAULT;
++
++	value = retval + 0x30;
++	if (put_user(value, buf))
++		return -EFAULT;
++
++	return 1;
++}
++
++static ssize_t gpio_write(struct file *file, const char __user *data,
++                          size_t len, loff_t *ppos)
++{
++	unsigned int pin;
++	size_t i;
++	char c;
++	int retval = 0;
++
++	pin = iminor(file->f_dentry->d_inode);
++
++	for (i = 0; i < len; i++) {
++		if (get_user(c, data + i))
++			return -EFAULT;
++
++		switch (c) {
++		case '0':
++		case '1':
++			retval = at91_set_gpio_value(PIN_BASE + pin, (int)c - 0x30);
++			if (retval < 0)
++				return -EFAULT;
++			break;
++		default:
++			break;
++		}
++
++		if (retval < 0)
++			break;
++	}
++
++	return i;
++}
++
++static int gpio_open(struct inode *inode, struct file *file)
++{
++	return nonseekable_open(inode, file);
++}
++
++static int gpio_release(struct inode *inode, struct file *file)
++{
++	return 0;
++}
++
++static struct file_operations vio_fops = {
++	.owner		= THIS_MODULE,
++	.read		= gpio_read,
++	.write		= gpio_write,
++	.open		= gpio_open,
++	.release	= gpio_release,
++};
++
++static void vio_setup_cdev(struct vio_dev *dev, int index)
++{
++	int err, devno = MKDEV(major, index);
++
++	cdev_init(&dev->cdev, &vio_fops);
++	dev->cdev.owner = THIS_MODULE;
++	dev->cdev.ops = &vio_fops;
++	err = cdev_add (&dev->cdev, devno, 1);
++	if (err)
++		printk(KERN_NOTICE "vio: Error %d adding vio%d", err, index);
++}
++
++static int vio_remove(struct platform_device *dev)
++{
++	int i;
++	dev_t devno = MKDEV(major, 0);
++
++	if (vio_devices) {
++		for(i=0; i<VIO_NR_DEVS; i++) {
++			int iodev = at91_is_pin_gpio(PIN_BASE + i);
++			if (iodev) {
++				cdev_del(&vio_devices[i].cdev);
++				class_device_destroy(vio_class, MKDEV(major, i));
++			}
++		}
++		kfree(vio_devices);
++	}
++
++	class_destroy(vio_class);
++	unregister_chrdev_region(devno, VIO_NR_DEVS);
++
++	platform_set_drvdata(dev, NULL);
++
++	return 0;
++}
++
++static int vio_probe(struct platform_device *dev)
++{
++	int retval, i, j;
++	dev_t vdev = 0;
++
++	if (major) {
++		vdev = MKDEV(major, 0);
++		retval = register_chrdev_region(vdev, VIO_NR_DEVS, "vio");
++	} else {
++		retval = alloc_chrdev_region(&vdev, 0, VIO_NR_DEVS, "vio");
++		major = MAJOR(vdev);
++	}
++	if (retval < 0) {
++		printk(KERN_WARNING "vio: can't get major %d\n", major);
++		return retval;
++	}
++
++	if (major == 0) {
++		major = retval;
++		printk(KERN_INFO "vio: major number %d\n", major);
++	}
++
++	vio_class = class_create(THIS_MODULE, "vio");
++
++	if (IS_ERR(vio_class)) {
++		printk(KERN_ERR "vio: Error creating vio class\n");
++		vio_remove(dev);
++		return PTR_ERR(vio_class);
++	}
++
++	vio_devices = kmalloc(VIO_NR_DEVS * sizeof(struct vio_dev), GFP_KERNEL);
++	if (!vio_devices) {
++		retval = -ENOMEM;
++		goto fail;
++	}
++	memset(vio_devices, 0, VIO_NR_DEVS * sizeof(struct vio_dev));
++
++	for (i=0; i<VIO_NR_DEVS/32; i++)
++		for(j=0; j<32; j++) {
++			int iodev = at91_is_pin_gpio(PIN_BASE + i*32 + j);
++			if (iodev) {
++				vio_setup_cdev(&vio_devices[i*32 + j], i*32 + j);
++				class_device_create(vio_class, NULL, MKDEV(major, i*32 + j), NULL,
++					"vio%c%d", i + 'A', j);
++			}
++		}
++
++	platform_set_drvdata(dev, vio_devices);
++
++	return 0;
++
++fail:
++	vio_remove(dev);
++	return retval;
++}
++
++static struct platform_device *vio_platform_device;
++
++static struct platform_driver vio_driver = {
++	.probe 		= vio_probe,
++	.remove		= vio_remove,
++	.driver		= {
++		.name	= "vio",
++		.owner	= THIS_MODULE,
++	},
++};
++
++static int __init vio_init(void)
++{
++	int retval;
++
++	vio_platform_device = platform_device_register_simple("vio", -1, NULL, 0);
++	if (IS_ERR(vio_platform_device)) {
++		printk(KERN_WARNING "vio: device registration failed\n");
++		return PTR_ERR(vio_platform_device);
++	}
++
++	retval = platform_driver_register(&vio_driver);
++	if (retval < 0) {
++		printk(KERN_WARNING "vio: driver registration failed\n");
++		platform_device_unregister(vio_platform_device);
++	}
++	
++	return retval;
++}
++
++static void __exit vio_exit(void)
++{
++	platform_driver_unregister(&vio_driver);
++	platform_device_unregister(vio_platform_device);
++}
++
++module_init(vio_init);
++module_exit(vio_exit);
++
++MODULE_AUTHOR("Hamish Guthrie <hamish@prodigi.ch>");
++MODULE_DESCRIPTION("FDL Versalink GPIO Driver");
++MODULE_LICENSE("GPL");
+diff -urN linux-2.6.19.2.old/include/asm-arm/arch-at91rm9200/gpio.h linux-2.6.19.2/include/asm-arm/arch-at91rm9200/gpio.h
+--- linux-2.6.19.2.old/include/asm-arm/arch-at91rm9200/gpio.h	2007-01-10 20:10:37.000000000 +0100
++++ linux-2.6.19.2/include/asm-arm/arch-at91rm9200/gpio.h	2007-03-07 01:17:23.000000000 +0100
+@@ -189,6 +189,7 @@
+ /* callable at any time */
+ extern int at91_set_gpio_value(unsigned pin, int value);
+ extern int at91_get_gpio_value(unsigned pin);
++extern int at91_is_pin_gpio(unsigned pin);
+ 
+ /* callable only from core power-management code */
+ extern void at91_gpio_suspend(void);