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authorDmitry Baryshkov <dbaryshkov@gmail.com>2008-04-10 13:36:53 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2008-04-10 15:31:38 +0100
commitb43a9e60873ebe16502061961ca3f3b7bc6f69d2 (patch)
treee8bfe4fc09592010dbd007576f5eeeddc494f7d8 /arch/arm
parent45528e38173e7d8c03821850e8fd1ddbf16f2b3d (diff)
[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>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/common/scoop.c125
1 files changed, 119 insertions, 6 deletions
diff --git a/arch/arm/common/scoop.c b/arch/arm/common/scoop.c
index fc08577cdd6..bc299b07a6f 100644
--- a/arch/arm/common/scoop.c
+++ b/arch/arm/common/scoop.c
@@ -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;
}