177 lines
4.2 KiB
C
177 lines
4.2 KiB
C
/*
|
|
* Support code for the SCOOP interface found on various Sharp PDAs
|
|
*
|
|
* Copyright (c) 2004 Richard Purdie
|
|
*
|
|
* Based on code written by Sharp/Lineo for 2.4 kernels
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
*/
|
|
|
|
#include <linux/device.h>
|
|
#include <asm/io.h>
|
|
#include <asm/hardware/scoop.h>
|
|
|
|
#define SCOOP_REG(d,adr) (*(volatile unsigned short*)(d +(adr)))
|
|
|
|
struct scoop_dev {
|
|
void *base;
|
|
spinlock_t scoop_lock;
|
|
u32 scoop_gpwr;
|
|
};
|
|
|
|
void reset_scoop(struct device *dev)
|
|
{
|
|
struct scoop_dev *sdev = dev_get_drvdata(dev);
|
|
|
|
SCOOP_REG(sdev->base,SCOOP_MCR) = 0x0100; // 00
|
|
SCOOP_REG(sdev->base,SCOOP_CDR) = 0x0000; // 04
|
|
SCOOP_REG(sdev->base,SCOOP_CPR) = 0x0000; // 0C
|
|
SCOOP_REG(sdev->base,SCOOP_CCR) = 0x0000; // 10
|
|
SCOOP_REG(sdev->base,SCOOP_IMR) = 0x0000; // 18
|
|
SCOOP_REG(sdev->base,SCOOP_IRM) = 0x00FF; // 14
|
|
SCOOP_REG(sdev->base,SCOOP_ISR) = 0x0000; // 1C
|
|
SCOOP_REG(sdev->base,SCOOP_IRM) = 0x0000;
|
|
}
|
|
|
|
unsigned short set_scoop_gpio(struct device *dev, unsigned short bit)
|
|
{
|
|
unsigned short gpio_bit;
|
|
unsigned long flag;
|
|
struct scoop_dev *sdev = dev_get_drvdata(dev);
|
|
|
|
spin_lock_irqsave(&sdev->scoop_lock, flag);
|
|
gpio_bit = SCOOP_REG(sdev->base, SCOOP_GPWR) | bit;
|
|
SCOOP_REG(sdev->base, SCOOP_GPWR) = gpio_bit;
|
|
spin_unlock_irqrestore(&sdev->scoop_lock, flag);
|
|
|
|
return gpio_bit;
|
|
}
|
|
|
|
unsigned short reset_scoop_gpio(struct device *dev, unsigned short bit)
|
|
{
|
|
unsigned short gpio_bit;
|
|
unsigned long flag;
|
|
struct scoop_dev *sdev = dev_get_drvdata(dev);
|
|
|
|
spin_lock_irqsave(&sdev->scoop_lock, flag);
|
|
gpio_bit = SCOOP_REG(sdev->base, SCOOP_GPWR) & ~bit;
|
|
SCOOP_REG(sdev->base,SCOOP_GPWR) = gpio_bit;
|
|
spin_unlock_irqrestore(&sdev->scoop_lock, flag);
|
|
|
|
return gpio_bit;
|
|
}
|
|
|
|
EXPORT_SYMBOL(set_scoop_gpio);
|
|
EXPORT_SYMBOL(reset_scoop_gpio);
|
|
|
|
unsigned short read_scoop_reg(struct device *dev, unsigned short reg)
|
|
{
|
|
struct scoop_dev *sdev = dev_get_drvdata(dev);
|
|
return SCOOP_REG(sdev->base,reg);
|
|
}
|
|
|
|
void write_scoop_reg(struct device *dev, unsigned short reg, unsigned short data)
|
|
{
|
|
struct scoop_dev *sdev = dev_get_drvdata(dev);
|
|
SCOOP_REG(sdev->base,reg)=data;
|
|
}
|
|
|
|
EXPORT_SYMBOL(reset_scoop);
|
|
EXPORT_SYMBOL(read_scoop_reg);
|
|
EXPORT_SYMBOL(write_scoop_reg);
|
|
|
|
#ifdef CONFIG_PM
|
|
static int scoop_suspend(struct device *dev, uint32_t state, uint32_t level)
|
|
{
|
|
if (level == SUSPEND_POWER_DOWN) {
|
|
struct scoop_dev *sdev = dev_get_drvdata(dev);
|
|
|
|
sdev->scoop_gpwr = SCOOP_REG(sdev->base,SCOOP_GPWR);
|
|
SCOOP_REG(sdev->base,SCOOP_GPWR) = 0;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int scoop_resume(struct device *dev, uint32_t level)
|
|
{
|
|
if (level == RESUME_POWER_ON) {
|
|
struct scoop_dev *sdev = dev_get_drvdata(dev);
|
|
|
|
SCOOP_REG(sdev->base,SCOOP_GPWR) = sdev->scoop_gpwr;
|
|
}
|
|
return 0;
|
|
}
|
|
#else
|
|
#define scoop_suspend NULL
|
|
#define scoop_resume NULL
|
|
#endif
|
|
|
|
int __init scoop_probe(struct device *dev)
|
|
{
|
|
struct scoop_dev *devptr;
|
|
struct scoop_config *inf;
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
|
|
if (!mem)
|
|
return -EINVAL;
|
|
|
|
devptr = kmalloc(sizeof(struct scoop_dev), GFP_KERNEL);
|
|
|
|
if (!devptr)
|
|
return -ENOMEM;
|
|
|
|
memset(devptr, 0, sizeof(struct scoop_dev));
|
|
spin_lock_init(&devptr->scoop_lock);
|
|
|
|
inf = dev->platform_data;
|
|
devptr->base = ioremap(mem->start, mem->end - mem->start + 1);
|
|
|
|
if (!devptr->base) {
|
|
kfree(devptr);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
dev_set_drvdata(dev, devptr);
|
|
|
|
printk("Sharp Scoop Device found at 0x%08x -> 0x%08x\n",(unsigned int)mem->start,(unsigned int)devptr->base);
|
|
|
|
SCOOP_REG(devptr->base, SCOOP_MCR) = 0x0140;
|
|
reset_scoop(dev);
|
|
SCOOP_REG(devptr->base, SCOOP_GPCR) = inf->io_dir & 0xffff;
|
|
SCOOP_REG(devptr->base, SCOOP_GPWR) = inf->io_out & 0xffff;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int scoop_remove(struct device *dev)
|
|
{
|
|
struct scoop_dev *sdev = dev_get_drvdata(dev);
|
|
if (sdev) {
|
|
iounmap(sdev->base);
|
|
kfree(sdev);
|
|
dev_set_drvdata(dev, NULL);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct device_driver scoop_driver = {
|
|
.name = "sharp-scoop",
|
|
.bus = &platform_bus_type,
|
|
.probe = scoop_probe,
|
|
.remove = scoop_remove,
|
|
.suspend = scoop_suspend,
|
|
.resume = scoop_resume,
|
|
};
|
|
|
|
int __init scoop_init(void)
|
|
{
|
|
return driver_register(&scoop_driver);
|
|
}
|
|
|
|
subsys_initcall(scoop_init);
|