gpio: pl061: convert driver to use gpiolib irqchip

This converts the PL061 driver to register its chained irq
handler and irqchip using the helpers in the gpiolib core.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

2 files changed, 19 insertions, 62 deletions

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 51c782532687..92d8e9a064b4 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -247,6 +247,7 @@ config GPIO_PL061
         bool "PrimeCell PL061 GPIO support"
         depends on ARM_AMBA
         select IRQ_DOMAIN
+        select GPIOLIB_IRQCHIP
         help
           Say yes here to support the PrimeCell PL061 GPIO device
 
diff --git a/drivers/gpio/gpio-pl061.c b/drivers/gpio/gpio-pl061.c
index d2a0ad5fc752..b0f475243cef 100644
--- a/drivers/gpio/gpio-pl061.c
+++ b/drivers/gpio/gpio-pl061.c
@@ -15,7 +15,6 @@
 #include <linux/io.h>
 #include <linux/ioport.h>
 #include <linux/irq.h>
-#include <linux/irqdomain.h>
 #include <linux/irqchip/chained_irq.h>
 #include <linux/bitops.h>
 #include <linux/workqueue.h>
@@ -53,7 +52,6 @@ struct pl061_gpio {
         spinlock_t              lock;
 
         void __iomem            *base;
-        struct irq_domain       *domain;
         struct gpio_chip        gc;
 
 #ifdef CONFIG_PM
@@ -137,16 +135,10 @@ static void pl061_set_value(struct gpio_chip *gc, unsigned offset, int value)
         writeb(!!value << offset, chip->base + (1 << (offset + 2)));
 }
 
-static int pl061_to_irq(struct gpio_chip *gc, unsigned offset)
-{
-        struct pl061_gpio *chip = container_of(gc, struct pl061_gpio, gc);
-
-        return irq_create_mapping(chip->domain, offset);
-}
-
 static int pl061_irq_type(struct irq_data *d, unsigned trigger)
 {
-        struct pl061_gpio *chip = irq_data_get_irq_chip_data(d);
+        struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+        struct pl061_gpio *chip = container_of(gc, struct pl061_gpio, gc);
         int offset = irqd_to_hwirq(d);
         unsigned long flags;
         u8 gpiois, gpioibe, gpioiev;
@@ -194,7 +186,8 @@ static void pl061_irq_handler(unsigned irq, struct irq_desc *desc)
 {
         unsigned long pending;
         int offset;
-        struct pl061_gpio *chip = irq_desc_get_handler_data(desc);
+        struct gpio_chip *gc = irq_desc_get_handler_data(desc);
+        struct pl061_gpio *chip = container_of(gc, struct pl061_gpio, gc);
         struct irq_chip *irqchip = irq_desc_get_chip(desc);
 
         chained_irq_enter(irqchip, desc);
@@ -203,7 +196,8 @@ static void pl061_irq_handler(unsigned irq, struct irq_desc *desc)
         writeb(pending, chip->base + GPIOIC);
         if (pending) {
                 for_each_set_bit(offset, &pending, PL061_GPIO_NR)
-                        generic_handle_irq(pl061_to_irq(&chip->gc, offset));
+                        generic_handle_irq(irq_find_mapping(gc->irqdomain,
+                                                            offset));
         }
 
         chained_irq_exit(irqchip, desc);
@@ -211,7 +205,8 @@ static void pl061_irq_handler(unsigned irq, struct irq_desc *desc)
 
 static void pl061_irq_mask(struct irq_data *d)
 {
-        struct pl061_gpio *chip = irq_data_get_irq_chip_data(d);
+        struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+        struct pl061_gpio *chip = container_of(gc, struct pl061_gpio, gc);
         u8 mask = 1 << (irqd_to_hwirq(d) % PL061_GPIO_NR);
         u8 gpioie;
 
@@ -223,7 +218,8 @@ static void pl061_irq_mask(struct irq_data *d)
 
 static void pl061_irq_unmask(struct irq_data *d)
 {
-        struct pl061_gpio *chip = irq_data_get_irq_chip_data(d);
+        struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+        struct pl061_gpio *chip = container_of(gc, struct pl061_gpio, gc);
         u8 mask = 1 << (irqd_to_hwirq(d) % PL061_GPIO_NR);
         u8 gpioie;
 
@@ -233,50 +229,11 @@ static void pl061_irq_unmask(struct irq_data *d)
         spin_unlock(&chip->lock);
 }
 
-static int pl061_irq_reqres(struct irq_data *d)
-{
-        struct pl061_gpio *chip = irq_data_get_irq_chip_data(d);
-
-        if (gpio_lock_as_irq(&chip->gc, irqd_to_hwirq(d))) {
-                dev_err(chip->gc.dev,
-                        "unable to lock HW IRQ %lu for IRQ\n",
-                        irqd_to_hwirq(d));
-                return -EINVAL;
-        }
-        return 0;
-}
-
-static void pl061_irq_relres(struct irq_data *d)
-{
-        struct pl061_gpio *chip = irq_data_get_irq_chip_data(d);
-
-        gpio_unlock_as_irq(&chip->gc, irqd_to_hwirq(d));
-}
-
 static struct irq_chip pl061_irqchip = {
         .name           = "pl061",
         .irq_mask       = pl061_irq_mask,
         .irq_unmask     = pl061_irq_unmask,
         .irq_set_type   = pl061_irq_type,
-        .irq_request_resources = pl061_irq_reqres,
-        .irq_release_resources = pl061_irq_relres,
-};
-
-static int pl061_irq_map(struct irq_domain *d, unsigned int irq,
-                         irq_hw_number_t hwirq)
-{
-        struct pl061_gpio *chip = d->host_data;
-
-        irq_set_chip_and_handler(irq, &pl061_irqchip, handle_simple_irq);
-        irq_set_chip_data(irq, chip);
-        irq_set_irq_type(irq, IRQ_TYPE_NONE);
-
-        return 0;
-}
-
-static const struct irq_domain_ops pl061_domain_ops = {
-        .map    = pl061_irq_map,
-        .xlate  = irq_domain_xlate_twocell,
 };
 
 static int pl061_probe(struct amba_device *adev, const struct amba_id *id)
@@ -314,7 +271,6 @@ static int pl061_probe(struct amba_device *adev, const struct amba_id *id)
         chip->gc.direction_output = pl061_direction_output;
         chip->gc.get = pl061_get_value;
         chip->gc.set = pl061_set_value;
-        chip->gc.to_irq = pl061_to_irq;
         chip->gc.ngpio = PL061_GPIO_NR;
         chip->gc.label = dev_name(dev);
         chip->gc.dev = dev;
@@ -334,15 +290,15 @@ static int pl061_probe(struct amba_device *adev, const struct amba_id *id)
                 return -ENODEV;
         }
 
-        irq_set_chained_handler(irq, pl061_irq_handler);
-        irq_set_handler_data(irq, chip);
-
-        chip->domain = irq_domain_add_simple(adev->dev.of_node, PL061_GPIO_NR,
-                                             irq_base, &pl061_domain_ops, chip);
-        if (!chip->domain) {
-                dev_err(&adev->dev, "no irq domain\n");
-                return -ENODEV;
+        ret = gpiochip_irqchip_add(&chip->gc, &pl061_irqchip,
+                                   irq_base, handle_simple_irq,
+                                   IRQ_TYPE_NONE);
+        if (ret) {
+                dev_info(&adev->dev, "could not add irqchip\n");
+                return ret;
         }
+        gpiochip_set_chained_irqchip(&chip->gc, &pl061_irqchip,
+                                     irq, pl061_irq_handler);
 
         for (i = 0; i < PL061_GPIO_NR; i++) {
                 if (pdata) {