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/*
* 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 <linux/string.h>
#include <linux/slab.h>
#include <linux/platform_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;
unsigned short suspend_clr;
unsigned short suspend_set;
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_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);
static void check_scoop_reg(struct scoop_dev *sdev)
{
unsigned short mcr;
mcr = SCOOP_REG(sdev->base, SCOOP_MCR);
if ((mcr & 0x100) == 0)
SCOOP_REG(sdev->base, SCOOP_MCR) = 0x0101;
}
#ifdef CONFIG_PM
static int scoop_suspend(struct platform_device *dev, pm_message_t state)
{
struct scoop_dev *sdev = platform_get_drvdata(dev);
check_scoop_reg(sdev);
sdev->scoop_gpwr = SCOOP_REG(sdev->base, SCOOP_GPWR);
SCOOP_REG(sdev->base, SCOOP_GPWR) = (sdev->scoop_gpwr & ~sdev->suspend_clr) | sdev->suspend_set;
return 0;
}
static int scoop_resume(struct platform_device *dev)
{
struct scoop_dev *sdev = platform_get_drvdata(dev);
check_scoop_reg(sdev);
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 platform_device *pdev)
{
struct scoop_dev *devptr;
struct scoop_config *inf;
struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!mem)
return -EINVAL;
devptr = kzalloc(sizeof(struct scoop_dev), GFP_KERNEL);
if (!devptr)
return -ENOMEM;
spin_lock_init(&devptr->scoop_lock);
inf = pdev->dev.platform_data;
devptr->base = ioremap(mem->start, mem->end - mem->start + 1);
if (!devptr->base) {
kfree(devptr);
return -ENOMEM;
}
platform_set_drvdata(pdev, 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(&pdev->dev);
SCOOP_REG(devptr->base, SCOOP_CPR) = 0x0000;
SCOOP_REG(devptr->base, SCOOP_GPCR) = inf->io_dir & 0xffff;
SCOOP_REG(devptr->base, SCOOP_GPWR) = inf->io_out & 0xffff;
devptr->suspend_clr = inf->suspend_clr;
devptr->suspend_set = inf->suspend_set;
return 0;
}
static int scoop_remove(struct platform_device *pdev)
{
struct scoop_dev *sdev = platform_get_drvdata(pdev);
if (sdev) {
iounmap(sdev->base);
kfree(sdev);
platform_set_drvdata(pdev, NULL);
}
return 0;
}
static struct platform_driver scoop_driver = {
.probe = scoop_probe,
.remove = scoop_remove,
.suspend = scoop_suspend,
.resume = scoop_resume,
.driver = {
.name = "sharp-scoop",
},
};
int __init scoop_init(void)
{
return platform_driver_register(&scoop_driver);
}
subsys_initcall(scoop_init);
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