[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>

1 files changed, 119 insertions, 6 deletions

diff --git a/arch/arm/common/scoop.c b/arch/arm/common/scoop.c
index fc08577cdd6c..bc299b07a6fa 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;
 }