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>

2 files changed, 162 insertions, 68 deletions

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 1e06d233fa83..00a23a118492 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -568,7 +568,7 @@ config MIKROTIK_RB532
         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 b028779fedda..76a7fd96d564 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>
-
-struct rb532_gpio_reg __iomem *rb532_gpio_reg0;
-EXPORT_SYMBOL(rb532_gpio_reg0);
+#include <asm/mach-rc32434/gpio.h>
+
+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 @@ unsigned char get_latch_u5(void)
 }
 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);
-        if (value)
-                tmp |= 1 << gpio;
+        gpch = container_of(chip, struct rb532_gpio_chip, chip);
+        gpvr = gpch->regbase + GPIOD;
 
-        writel(tmp, (void *)&rb532_gpio_reg0->gpiod);
+        local_irq_save(flags);
+        tmp = readl(gpvr);
+        if (value)
+                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;
 
-        return 0;
-}
-EXPORT_SYMBOL(rb532_gpio_direction_input);
+        gpch = container_of(chip, struct rb532_gpio_chip, chip);
+        gpdr = gpch->regbase + GPIOCFG;
 
-int rb532_gpio_direction_output(unsigned gpio, int value)
-{
-        gpio_set_value(gpio, value);
-        writel(readl(&rb532_gpio_reg0->gpiocfg) | (1 << gpio),
-               (void *)&rb532_gpio_reg0->gpiocfg);
+        local_irq_save(flags);
+        value = readl(gpdr);
+        value &= ~mask;
+        writel(value, gpdr);
+        local_irq_restore(flags);
 
         return 0;
 }
-EXPORT_SYMBOL(rb532_gpio_direction_output);
 
-void rb532_gpio_set_int_level(unsigned gpio, int value)
+/*
+ * Set GPIO direction to output
+ */
+static int rb532_gpio_direction_output(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            *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);
 
-        tmp = readl(&rb532_gpio_reg0->gpioilevel) & ~(1 << gpio);
-        if (value)
-                tmp |= 1 << gpio;
-        writel(tmp, (void *)&rb532_gpio_reg0->gpioilevel);
+        return 0;
 }
-EXPORT_SYMBOL(rb532_gpio_set_int_level);
 
-int rb532_gpio_get_int_level(unsigned gpio)
+/*
+ * Set the GPIO interrupt level
+ */
+static void rb532_gpio_set_int_level(struct gpio_chip *chip,
+                                        unsigned offset, int value)
 {
-        return readl(&rb532_gpio_reg0->gpioilevel) & (1 << gpio);
-}
-EXPORT_SYMBOL(rb532_gpio_get_int_level);
+        unsigned long           flags;
+        u32                     mask = 1 << offset;
+        u32                     tmp;
+        struct rb532_gpio_chip  *gpch;
+        void __iomem            *gpil;
 
-void rb532_gpio_set_int_status(unsigned gpio, int value)
-{
-        unsigned tmp;
+        gpch = container_of(chip, struct rb532_gpio_chip, chip);
+        gpil = gpch->regbase + GPIOILEVEL;
 
-        tmp = readl(&rb532_gpio_reg0->gpioistat);
+        local_irq_save(flags);
+        tmp = readl(gpil);
         if (value)
-                tmp |= 1 << gpio;
-        writel(tmp, (void *)&rb532_gpio_reg0->gpioistat);
+                tmp |= mask;
+        else
+                tmp &= ~mask;
+        writel(tmp, gpil);
+        local_irq_restore(flags);
 }
-EXPORT_SYMBOL(rb532_gpio_set_int_status);
 
-int rb532_gpio_get_int_status(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->gpioistat) & (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_status);
 
-void rb532_gpio_set_func(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;
+
+        gpch = container_of(chip, struct rb532_gpio_chip, chip);
+        gpis = gpch->regbase + GPIOISTAT;
 
-        tmp = readl(&rb532_gpio_reg0->gpiofunc);
+        local_irq_save(flags);
+        tmp = readl(gpis);
         if (value)
-                tmp |= 1 << gpio;
-        writel(tmp, (void *)&rb532_gpio_reg0->gpiofunc);
+                tmp |= mask;
+        else
+                tmp &= ~mask;
+        writel(tmp, gpis);
+        local_irq_restore(flags);
 }
-EXPORT_SYMBOL(rb532_gpio_set_func);
 
-int rb532_gpio_get_func(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->gpiofunc) & (1 << gpio);
+        u32                     mask = 1 << offset;
+        struct rb532_gpio_chip  *gpch;
+
+        gpch = container_of(chip, struct rb532_gpio_chip, chip);
+        return readl(gpch->regbase + GPIOISTAT) & mask;
 }
-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");