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[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>
This commit is contained in:
Dmitry Baryshkov 2008-04-10 13:36:53 +01:00 committed by Russell King
parent 45528e3817
commit b43a9e6087
2 changed files with 122 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

125
arch/arm/common/scoop.c
View File

@ -16,6 +16,7 @@
#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
@ -32,6 +33,7 @@ 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;
@ -51,6 +53,77 @@ void reset_scoop(struct device *dev)
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;
@ -138,6 +211,8 @@ 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;
@ -152,8 +227,8 @@ static int __devinit scoop_probe(struct platform_device *pdev)
devptr->base = ioremap(mem->start, mem->end - mem->start + 1);
if (!devptr->base) {
kfree(devptr);
return -ENOMEM;
ret = -ENOMEM;
goto err_ioremap;
}
platform_set_drvdata(pdev, devptr);
@ -169,17 +244,55 @@ static int __devinit scoop_probe(struct platform_device *pdev)
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);
if (sdev) {
iounmap(sdev->base);
kfree(sdev);
platform_set_drvdata(pdev, NULL);
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;
}

5
include/asm-arm/hardware/scoop.h
View File

@ -40,6 +40,7 @@ struct scoop_config {
unsigned short io_dir;
unsigned short suspend_clr;
unsigned short suspend_set;
int gpio_base;
};
/* Structure for linking scoop devices to PCMCIA sockets */
@ -62,7 +63,7 @@ struct scoop_pcmcia_config {
extern struct scoop_pcmcia_config *platform_scoop_config;
void reset_scoop(struct device *dev);
unsigned short set_scoop_gpio(struct device *dev, unsigned short bit);
unsigned short reset_scoop_gpio(struct device *dev, unsigned short bit);
unsigned short __deprecated set_scoop_gpio(struct device *dev, unsigned short bit);
unsigned short __deprecated reset_scoop_gpio(struct device *dev, unsigned short bit);
unsigned short read_scoop_reg(struct device *dev, unsigned short reg);
void write_scoop_reg(struct device *dev, unsigned short reg, unsigned short data);