MIPS: RB532: Convert to GPIO lib
This patch converts the rb532 code to use gpio library
and register its gpio chip.
Signed-off-by: Florian Fainelli <florian@openwrt.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 1e06d23..00a23a1 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -568,7 +568,7 @@
select SYS_SUPPORTS_LITTLE_ENDIAN
select SWAP_IO_SPACE
select BOOT_RAW
- select GENERIC_GPIO
+ select ARCH_REQUIRE_GPIOLIB
help
Support the Mikrotik(tm) RouterBoard 532 series,
based on the IDT RC32434 SoC.
diff --git a/arch/mips/rb532/gpio.c b/arch/mips/rb532/gpio.c
index b028779..76a7fd9 100644
--- a/arch/mips/rb532/gpio.c
+++ b/arch/mips/rb532/gpio.c
@@ -27,20 +27,23 @@
*/
#include <linux/kernel.h>
-#include <linux/gpio.h>
#include <linux/init.h>
#include <linux/types.h>
-#include <linux/pci.h>
#include <linux/spinlock.h>
-#include <linux/io.h>
#include <linux/platform_device.h>
-
-#include <asm/addrspace.h>
+#include <linux/gpio.h>
#include <asm/mach-rc32434/rb.h>
+#include <asm/mach-rc32434/gpio.h>
-struct rb532_gpio_reg __iomem *rb532_gpio_reg0;
-EXPORT_SYMBOL(rb532_gpio_reg0);
+struct rb532_gpio_chip {
+ struct gpio_chip chip;
+ void __iomem *regbase;
+ void (*set_int_level)(struct gpio_chip *chip, unsigned offset, int value);
+ int (*get_int_level)(struct gpio_chip *chip, unsigned offset);
+ void (*set_int_status)(struct gpio_chip *chip, unsigned offset, int value);
+ int (*get_int_status)(struct gpio_chip *chip, unsigned offset);
+};
struct mpmc_device dev3;
@@ -108,108 +111,199 @@
}
EXPORT_SYMBOL(get_latch_u5);
-int rb532_gpio_get_value(unsigned gpio)
+/*
+ * Return GPIO level */
+static int rb532_gpio_get(struct gpio_chip *chip, unsigned offset)
{
- return readl(&rb532_gpio_reg0->gpiod) & (1 << gpio);
+ u32 mask = 1 << offset;
+ struct rb532_gpio_chip *gpch;
+
+ gpch = container_of(chip, struct rb532_gpio_chip, chip);
+ return readl(gpch->regbase + GPIOD) & mask;
}
-EXPORT_SYMBOL(rb532_gpio_get_value);
-void rb532_gpio_set_value(unsigned gpio, int value)
+/*
+ * Set output GPIO level
+ */
+static void rb532_gpio_set(struct gpio_chip *chip,
+ unsigned offset, int value)
{
- unsigned tmp;
+ unsigned long flags;
+ u32 mask = 1 << offset;
+ u32 tmp;
+ struct rb532_gpio_chip *gpch;
+ void __iomem *gpvr;
- tmp = readl(&rb532_gpio_reg0->gpiod) & ~(1 << gpio);
+ gpch = container_of(chip, struct rb532_gpio_chip, chip);
+ gpvr = gpch->regbase + GPIOD;
+
+ local_irq_save(flags);
+ tmp = readl(gpvr);
if (value)
- tmp |= 1 << gpio;
-
- writel(tmp, (void *)&rb532_gpio_reg0->gpiod);
+ tmp |= mask;
+ else
+ tmp &= ~mask;
+ writel(tmp, gpvr);
+ local_irq_restore(flags);
}
-EXPORT_SYMBOL(rb532_gpio_set_value);
-int rb532_gpio_direction_input(unsigned gpio)
+/*
+ * Set GPIO direction to input
+ */
+static int rb532_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
{
- writel(readl(&rb532_gpio_reg0->gpiocfg) & ~(1 << gpio),
- (void *)&rb532_gpio_reg0->gpiocfg);
+ unsigned long flags;
+ u32 mask = 1 << offset;
+ u32 value;
+ struct rb532_gpio_chip *gpch;
+ void __iomem *gpdr;
+
+ gpch = container_of(chip, struct rb532_gpio_chip, chip);
+ gpdr = gpch->regbase + GPIOCFG;
+
+ local_irq_save(flags);
+ value = readl(gpdr);
+ value &= ~mask;
+ writel(value, gpdr);
+ local_irq_restore(flags);
return 0;
}
-EXPORT_SYMBOL(rb532_gpio_direction_input);
-int rb532_gpio_direction_output(unsigned gpio, int value)
+/*
+ * Set GPIO direction to output
+ */
+static int rb532_gpio_direction_output(struct gpio_chip *chip,
+ unsigned offset, int value)
{
- gpio_set_value(gpio, value);
- writel(readl(&rb532_gpio_reg0->gpiocfg) | (1 << gpio),
- (void *)&rb532_gpio_reg0->gpiocfg);
+ unsigned long flags;
+ u32 mask = 1 << offset;
+ u32 tmp;
+ struct rb532_gpio_chip *gpch;
+ void __iomem *gpdr;
+
+ gpch = container_of(chip, struct rb532_gpio_chip, chip);
+ writel(mask, gpch->regbase + GPIOD);
+ gpdr = gpch->regbase + GPIOCFG;
+
+ local_irq_save(flags);
+ tmp = readl(gpdr);
+ tmp |= mask;
+ writel(tmp, gpdr);
+ local_irq_restore(flags);
return 0;
}
-EXPORT_SYMBOL(rb532_gpio_direction_output);
-void rb532_gpio_set_int_level(unsigned gpio, int value)
+/*
+ * Set the GPIO interrupt level
+ */
+static void rb532_gpio_set_int_level(struct gpio_chip *chip,
+ unsigned offset, int value)
{
- unsigned tmp;
+ unsigned long flags;
+ u32 mask = 1 << offset;
+ u32 tmp;
+ struct rb532_gpio_chip *gpch;
+ void __iomem *gpil;
- tmp = readl(&rb532_gpio_reg0->gpioilevel) & ~(1 << gpio);
+ gpch = container_of(chip, struct rb532_gpio_chip, chip);
+ gpil = gpch->regbase + GPIOILEVEL;
+
+ local_irq_save(flags);
+ tmp = readl(gpil);
if (value)
- tmp |= 1 << gpio;
- writel(tmp, (void *)&rb532_gpio_reg0->gpioilevel);
+ tmp |= mask;
+ else
+ tmp &= ~mask;
+ writel(tmp, gpil);
+ local_irq_restore(flags);
}
-EXPORT_SYMBOL(rb532_gpio_set_int_level);
-int rb532_gpio_get_int_level(unsigned gpio)
+/*
+ * Get the GPIO interrupt level
+ */
+static int rb532_gpio_get_int_level(struct gpio_chip *chip, unsigned offset)
{
- return readl(&rb532_gpio_reg0->gpioilevel) & (1 << gpio);
+ u32 mask = 1 << offset;
+ struct rb532_gpio_chip *gpch;
+
+ gpch = container_of(chip, struct rb532_gpio_chip, chip);
+ return readl(gpch->regbase + GPIOILEVEL) & mask;
}
-EXPORT_SYMBOL(rb532_gpio_get_int_level);
-void rb532_gpio_set_int_status(unsigned gpio, int value)
+/*
+ * Set the GPIO interrupt status
+ */
+static void rb532_gpio_set_int_status(struct gpio_chip *chip,
+ unsigned offset, int value)
{
- unsigned tmp;
+ unsigned long flags;
+ u32 mask = 1 << offset;
+ u32 tmp;
+ struct rb532_gpio_chip *gpch;
+ void __iomem *gpis;
- tmp = readl(&rb532_gpio_reg0->gpioistat);
+ gpch = container_of(chip, struct rb532_gpio_chip, chip);
+ gpis = gpch->regbase + GPIOISTAT;
+
+ local_irq_save(flags);
+ tmp = readl(gpis);
if (value)
- tmp |= 1 << gpio;
- writel(tmp, (void *)&rb532_gpio_reg0->gpioistat);
+ tmp |= mask;
+ else
+ tmp &= ~mask;
+ writel(tmp, gpis);
+ local_irq_restore(flags);
}
-EXPORT_SYMBOL(rb532_gpio_set_int_status);
-int rb532_gpio_get_int_status(unsigned gpio)
+/*
+ * Get the GPIO interrupt status
+ */
+static int rb532_gpio_get_int_status(struct gpio_chip *chip, unsigned offset)
{
- return readl(&rb532_gpio_reg0->gpioistat) & (1 << gpio);
-}
-EXPORT_SYMBOL(rb532_gpio_get_int_status);
+ u32 mask = 1 << offset;
+ struct rb532_gpio_chip *gpch;
-void rb532_gpio_set_func(unsigned gpio, int value)
-{
- unsigned tmp;
-
- tmp = readl(&rb532_gpio_reg0->gpiofunc);
- if (value)
- tmp |= 1 << gpio;
- writel(tmp, (void *)&rb532_gpio_reg0->gpiofunc);
+ gpch = container_of(chip, struct rb532_gpio_chip, chip);
+ return readl(gpch->regbase + GPIOISTAT) & mask;
}
-EXPORT_SYMBOL(rb532_gpio_set_func);
-int rb532_gpio_get_func(unsigned gpio)
-{
- return readl(&rb532_gpio_reg0->gpiofunc) & (1 << gpio);
-}
-EXPORT_SYMBOL(rb532_gpio_get_func);
+static struct rb532_gpio_chip rb532_gpio_chip[] = {
+ [0] = {
+ .chip = {
+ .label = "gpio0",
+ .direction_input = rb532_gpio_direction_input,
+ .direction_output = rb532_gpio_direction_output,
+ .get = rb532_gpio_get,
+ .set = rb532_gpio_set,
+ .base = 0,
+ .ngpio = 32,
+ },
+ .get_int_level = rb532_gpio_get_int_level,
+ .set_int_level = rb532_gpio_set_int_level,
+ .get_int_status = rb532_gpio_get_int_status,
+ .set_int_status = rb532_gpio_set_int_status,
+ },
+};
int __init rb532_gpio_init(void)
{
- rb532_gpio_reg0 = ioremap_nocache(rb532_gpio_reg0_res[0].start,
- rb532_gpio_reg0_res[0].end -
- rb532_gpio_reg0_res[0].start);
+ struct resource *r;
- if (!rb532_gpio_reg0) {
+ r = rb532_gpio_reg0_res;
+ rb532_gpio_chip->regbase = ioremap_nocache(r->start, r->end - r->start);
+
+ if (!rb532_gpio_chip->regbase) {
printk(KERN_ERR "rb532: cannot remap GPIO register 0\n");
return -ENXIO;
}
- dev3.base = ioremap_nocache(rb532_dev3_ctl_res[0].start,
- rb532_dev3_ctl_res[0].end -
- rb532_dev3_ctl_res[0].start);
+ /* Register our GPIO chip */
+ gpiochip_add(&rb532_gpio_chip->chip);
+
+ r = rb532_dev3_ctl_res;
+ dev3.base = ioremap_nocache(r->start, r->end - r->start);
if (!dev3.base) {
printk(KERN_ERR "rb532: cannot remap device controller 3\n");