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#include <linux/init.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/gpio.h>
#include <ifxmips.h>
#include <ifxmips_ebu.h>
#define IFXMIPS_EBU_BUSCON 0x1e7ff
#define IFXMIPS_EBU_WP 0x80000000
static int shadow = 0;
static void __iomem *virt;
static int
ifxmips_ebu_direction_output(struct gpio_chip *chip, unsigned offset, int value)
{
return 0;
}
static void
ifxmips_ebu_set(struct gpio_chip *chip, unsigned offset, int value)
{
unsigned long flags;
if(value)
shadow |= (1 << offset);
else
shadow &= ~(1 << offset);
spin_lock_irqsave(&ebu_lock, flags);
ifxmips_w32(IFXMIPS_EBU_BUSCON, IFXMIPS_EBU_BUSCON1);
*((__u16*)virt) = shadow;
ifxmips_w32(IFXMIPS_EBU_BUSCON | IFXMIPS_EBU_WP, IFXMIPS_EBU_BUSCON1);
spin_unlock_irqrestore(&ebu_lock, flags);
}
static struct gpio_chip
ifxmips_ebu_chip =
{
.label = "ifxmips_ebu",
.direction_output = ifxmips_ebu_direction_output,
.set = ifxmips_ebu_set,
.base = 32,
.ngpio = 16,
.can_sleep = 1,
.owner = THIS_MODULE,
};
static int __devinit
ifxmips_ebu_probe(struct platform_device *pdev)
{
ifxmips_w32(pdev->resource->start | 0x1, IFXMIPS_EBU_ADDRSEL1);
ifxmips_w32(IFXMIPS_EBU_BUSCON | IFXMIPS_EBU_WP, IFXMIPS_EBU_BUSCON1);
virt = ioremap_nocache(pdev->resource->start, pdev->resource->end);
if(gpiochip_add(&ifxmips_ebu_chip))
return -EINVAL;
shadow = (int) pdev->dev.platform_data;
printk("IFXMIPS: ebu-gpio loaded\n");
return 0;
}
static int
ifxmips_ebu_remove(struct platform_device *dev)
{
return gpiochip_remove(&ifxmips_ebu_chip);
}
static struct platform_driver
ifxmips_ebu_driver = {
.probe = ifxmips_ebu_probe,
.remove = ifxmips_ebu_remove,
.driver = {
.name = "ifxmips_ebu",
.owner = THIS_MODULE,
},
};
static int __init
ifxmips_ebu_init(void)
{
return platform_driver_register(&ifxmips_ebu_driver);
}
static void __exit
ifxmips_ebu_exit(void)
{
platform_driver_unregister(&ifxmips_ebu_driver);
}
module_init(ifxmips_ebu_init);
module_exit(ifxmips_ebu_exit);
MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("ifxmips - EBU Latch GPIO-Expander");
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