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linux/arch/arm/common/scoop.c
Dmitry Baryshkov b43a9e6087 [ARM] 4962/1: Introduce standard gpio interface for Scoop2. 
This deprecates old set/reset_scoop_gpio interfacein favour of
support for generic gpio interface.

It requires gpiolib, so it depends on the previous patch
(gpiolib for SA-1100).

Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2008-04-10 15:31:38 +01:00

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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/gpio.h>
#include <asm/hardware/scoop.h>
/* PCMCIA to Scoop linkage
There is no easy way to link multiple scoop devices into one
single entity for the pxa2xx_pcmcia device so this structure
is used which is setup by the platform code.
This file is never modular so this symbol is always
accessile to the board support files.
*/
struct scoop_pcmcia_config *platform_scoop_config;
EXPORT_SYMBOL(platform_scoop_config);
struct scoop_dev {
void __iomem *base;
struct gpio_chip gpio;
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);
iowrite16(0x0100, sdev->base + SCOOP_MCR); // 00
iowrite16(0x0000, sdev->base + SCOOP_CDR); // 04
iowrite16(0x0000, sdev->base + SCOOP_CCR); // 10
iowrite16(0x0000, sdev->base + SCOOP_IMR); // 18
iowrite16(0x00FF, sdev->base + SCOOP_IRM); // 14
iowrite16(0x0000, sdev->base + SCOOP_ISR); // 1C
iowrite16(0x0000, sdev->base + SCOOP_IRM);
}
static void __scoop_gpio_set(struct scoop_dev *sdev,
unsigned offset, int value)
{
unsigned short gpwr;
gpwr = ioread16(sdev->base + SCOOP_GPWR);
if (value)
gpwr |= 1 << (offset + 1);
else
gpwr &= ~(1 << (offset + 1));
iowrite16(gpwr, sdev->base + SCOOP_GPWR);
}
static void scoop_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
struct scoop_dev *sdev = container_of(chip, struct scoop_dev, gpio);
unsigned long flags;
spin_lock_irqsave(&sdev->scoop_lock, flags);
__scoop_gpio_set(sdev, offset, value);
spin_unlock_irqrestore(&sdev->scoop_lock, flags);
}
static int scoop_gpio_get(struct gpio_chip *chip, unsigned offset)
{
struct scoop_dev *sdev = container_of(chip, struct scoop_dev, gpio);
/* XXX: I'm usure, but it seems so */
return ioread16(sdev->base + SCOOP_GPRR) & (1 << (offset + 1));
}
static int scoop_gpio_direction_input(struct gpio_chip *chip,
unsigned offset)
{
struct scoop_dev *sdev = container_of(chip, struct scoop_dev, gpio);
unsigned long flags;
unsigned short gpcr;
spin_lock_irqsave(&sdev->scoop_lock, flags);
gpcr = ioread16(sdev->base + SCOOP_GPCR);
gpcr &= ~(1 << (offset + 1));
iowrite16(gpcr, sdev->base + SCOOP_GPCR);
spin_unlock_irqrestore(&sdev->scoop_lock, flags);
return 0;
}
static int scoop_gpio_direction_output(struct gpio_chip *chip,
unsigned offset, int value)
{
struct scoop_dev *sdev = container_of(chip, struct scoop_dev, gpio);
unsigned long flags;
unsigned short gpcr;
spin_lock_irqsave(&sdev->scoop_lock, flags);
__scoop_gpio_set(sdev, offset, value);
gpcr = ioread16(sdev->base + SCOOP_GPCR);
gpcr |= 1 << (offset + 1);
iowrite16(gpcr, sdev->base + SCOOP_GPCR);
spin_unlock_irqrestore(&sdev->scoop_lock, flags);
return 0;
}
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 = ioread16(sdev->base + SCOOP_GPWR) | bit;
iowrite16(gpio_bit, sdev->base + SCOOP_GPWR);
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 = ioread16(sdev->base + SCOOP_GPWR) & ~bit;
iowrite16(gpio_bit, sdev->base + SCOOP_GPWR);
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 ioread16(sdev->base + reg);
}
void write_scoop_reg(struct device *dev, unsigned short reg, unsigned short data)
{
struct scoop_dev *sdev = dev_get_drvdata(dev);
iowrite16(data, sdev->base + reg);
}
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 = ioread16(sdev->base + SCOOP_MCR);
if ((mcr & 0x100) == 0)
iowrite16(0x0101, sdev->base + SCOOP_MCR);
}
#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 = ioread16(sdev->base + SCOOP_GPWR);
iowrite16((sdev->scoop_gpwr & ~sdev->suspend_clr) | sdev->suspend_set, sdev->base + SCOOP_GPWR);
return 0;
}
static int scoop_resume(struct platform_device *dev)
{
struct scoop_dev *sdev = platform_get_drvdata(dev);
check_scoop_reg(sdev);
iowrite16(sdev->scoop_gpwr, sdev->base + SCOOP_GPWR);
return 0;
}
#else
#define scoop_suspend NULL
#define scoop_resume NULL
#endif
static int __devinit scoop_probe(struct platform_device *pdev)
{
struct scoop_dev *devptr;
struct scoop_config *inf;
struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
int ret;
int temp;
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) {
ret = -ENOMEM;
goto err_ioremap;
}
platform_set_drvdata(pdev, devptr);
printk("Sharp Scoop Device found at 0x%08x -> 0x%8p\n",(unsigned int)mem->start, devptr->base);
iowrite16(0x0140, devptr->base + SCOOP_MCR);
reset_scoop(&pdev->dev);
iowrite16(0x0000, devptr->base + SCOOP_CPR);
iowrite16(inf->io_dir & 0xffff, devptr->base + SCOOP_GPCR);
iowrite16(inf->io_out & 0xffff, devptr->base + SCOOP_GPWR);
devptr->suspend_clr = inf->suspend_clr;
devptr->suspend_set = inf->suspend_set;
devptr->gpio.base = -1;
if (inf->gpio_base != 0) {
devptr->gpio.label = pdev->dev.bus_id;
devptr->gpio.base = inf->gpio_base;
devptr->gpio.ngpio = 12; /* PA11 = 0, PA12 = 1, etc. up to PA22 = 11 */
devptr->gpio.set = scoop_gpio_set;
devptr->gpio.get = scoop_gpio_get;
devptr->gpio.direction_input = scoop_gpio_direction_input;
devptr->gpio.direction_output = scoop_gpio_direction_output;
ret = gpiochip_add(&devptr->gpio);
if (ret)
goto err_gpio;
}
return 0;
if (devptr->gpio.base != -1)
temp = gpiochip_remove(&devptr->gpio);
err_gpio:
platform_set_drvdata(pdev, NULL);
err_ioremap:
iounmap(devptr->base);
kfree(devptr);
return ret;
}
static int __devexit scoop_remove(struct platform_device *pdev)
{
struct scoop_dev *sdev = platform_get_drvdata(pdev);
int ret;
if (!sdev)
return -EINVAL;
if (sdev->gpio.base != -1) {
ret = gpiochip_remove(&sdev->gpio);
if (ret) {
dev_err(&pdev->dev, "Can't remove gpio chip: %d\n", ret);
return ret;
}
}
platform_set_drvdata(pdev, NULL);
iounmap(sdev->base);
kfree(sdev);
return 0;
}
static struct platform_driver scoop_driver = {
.probe = scoop_probe,
.remove = __devexit_p(scoop_remove),
.suspend = scoop_suspend,
.resume = scoop_resume,
.driver = {
.name = "sharp-scoop",
},
};
static int __init scoop_init(void)
{
return platform_driver_register(&scoop_driver);
}
subsys_initcall(scoop_init);
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