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Subject[PATCH 2/4] gpio: pl061: convert driver to use gpiolib irqchip
Date
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>
---
drivers/gpio/Kconfig | 1 +
drivers/gpio/gpio-pl061.c | 80 +++++++++++------------------------------------
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) {
--
1.8.5.3


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