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Subject[PATCH 3/4] pinctrl: nomadik: convert driver to use gpiolib irqchip
Date
This converts the Nomadik pin control 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/pinctrl/Kconfig | 3 +
drivers/pinctrl/pinctrl-nomadik.c | 123 ++++++++++----------------------------
2 files changed, 36 insertions(+), 90 deletions(-)

diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index 1e4e69384baa..a05087bd1955 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -235,6 +235,9 @@ config PINCTRL_NOMADIK
depends on ARCH_U8500 || ARCH_NOMADIK
select PINMUX
select PINCONF
+ select GPIOLIB
+ select OF_GPIO
+ select GPIOLIB_IRQCHIP

config PINCTRL_STN8815
bool "STN8815 pin controller driver"
diff --git a/drivers/pinctrl/pinctrl-nomadik.c b/drivers/pinctrl/pinctrl-nomadik.c
index 98a36a0969f9..db0cc30c82de 100644
--- a/drivers/pinctrl/pinctrl-nomadik.c
+++ b/drivers/pinctrl/pinctrl-nomadik.c
@@ -21,9 +21,6 @@
#include <linux/gpio.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <linux/irqdomain.h>
-#include <linux/irqchip/chained_irq.h>
#include <linux/slab.h>
#include <linux/of_device.h>
#include <linux/of_address.h>
@@ -248,7 +245,6 @@ enum nmk_gpio_slpm {

struct nmk_gpio_chip {
struct gpio_chip chip;
- struct irq_domain *domain;
void __iomem *addr;
struct clk *clk;
unsigned int bank;
@@ -419,7 +415,7 @@ nmk_gpio_disable_lazy_irq(struct nmk_gpio_chip *nmk_chip, unsigned offset)
u32 falling = nmk_chip->fimsc & BIT(offset);
u32 rising = nmk_chip->rimsc & BIT(offset);
int gpio = nmk_chip->chip.base + offset;
- int irq = irq_find_mapping(nmk_chip->domain, offset);
+ int irq = irq_find_mapping(nmk_chip->chip.irqdomain, offset);
struct irq_data *d = irq_get_irq_data(irq);

if (!rising && !falling)
@@ -647,11 +643,8 @@ static inline int nmk_gpio_get_bitmask(int gpio)

static void nmk_gpio_irq_ack(struct irq_data *d)
{
- struct nmk_gpio_chip *nmk_chip;
-
- nmk_chip = irq_data_get_irq_chip_data(d);
- if (!nmk_chip)
- return;
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
+ struct nmk_gpio_chip *nmk_chip = container_of(chip, struct nmk_gpio_chip, chip);

clk_enable(nmk_chip->clk);
writel(nmk_gpio_get_bitmask(d->hwirq), nmk_chip->addr + NMK_GPIO_IC);
@@ -848,26 +841,6 @@ static void nmk_gpio_irq_shutdown(struct irq_data *d)
clk_disable(nmk_chip->clk);
}

-static int nmk_gpio_irq_reqres(struct irq_data *d)
-{
- struct nmk_gpio_chip *nmk_chip = irq_data_get_irq_chip_data(d);
-
- if (gpio_lock_as_irq(&nmk_chip->chip, d->hwirq)) {
- dev_err(nmk_chip->chip.dev,
- "unable to lock HW IRQ %lu for IRQ\n",
- d->hwirq);
- return -EINVAL;
- }
- return 0;
-}
-
-static void nmk_gpio_irq_relres(struct irq_data *d)
-{
- struct nmk_gpio_chip *nmk_chip = irq_data_get_irq_chip_data(d);
-
- gpio_unlock_as_irq(&nmk_chip->chip, d->hwirq);
-}
-
static struct irq_chip nmk_gpio_irq_chip = {
.name = "Nomadik-GPIO",
.irq_ack = nmk_gpio_irq_ack,
@@ -877,24 +850,21 @@ static struct irq_chip nmk_gpio_irq_chip = {
.irq_set_wake = nmk_gpio_irq_set_wake,
.irq_startup = nmk_gpio_irq_startup,
.irq_shutdown = nmk_gpio_irq_shutdown,
- .irq_request_resources = nmk_gpio_irq_reqres,
- .irq_release_resources = nmk_gpio_irq_relres,
.flags = IRQCHIP_MASK_ON_SUSPEND,
};

static void __nmk_gpio_irq_handler(unsigned int irq, struct irq_desc *desc,
u32 status)
{
- struct nmk_gpio_chip *nmk_chip;
struct irq_chip *host_chip = irq_get_chip(irq);
+ struct gpio_chip *chip = irq_desc_get_handler_data(desc);

chained_irq_enter(host_chip, desc);

- nmk_chip = irq_get_handler_data(irq);
while (status) {
int bit = __ffs(status);

- generic_handle_irq(irq_find_mapping(nmk_chip->domain, bit));
+ generic_handle_irq(irq_find_mapping(chip->irqdomain, bit));
status &= ~BIT(bit);
}

@@ -903,9 +873,11 @@ static void __nmk_gpio_irq_handler(unsigned int irq, struct irq_desc *desc,

static void nmk_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
{
- struct nmk_gpio_chip *nmk_chip = irq_get_handler_data(irq);
+ struct gpio_chip *chip = irq_desc_get_handler_data(desc);
+ struct nmk_gpio_chip *nmk_chip = container_of(chip, struct nmk_gpio_chip, chip);
u32 status;

+ pr_err("PLONK IRQ %d\n", irq);
clk_enable(nmk_chip->clk);
status = readl(nmk_chip->addr + NMK_GPIO_IS);
clk_disable(nmk_chip->clk);
@@ -916,26 +888,13 @@ static void nmk_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
static void nmk_gpio_latent_irq_handler(unsigned int irq,
struct irq_desc *desc)
{
- struct nmk_gpio_chip *nmk_chip = irq_get_handler_data(irq);
+ struct gpio_chip *chip = irq_desc_get_handler_data(desc);
+ struct nmk_gpio_chip *nmk_chip = container_of(chip, struct nmk_gpio_chip, chip);
u32 status = nmk_chip->get_latent_status(nmk_chip->bank);

__nmk_gpio_irq_handler(irq, desc, status);
}

-static int nmk_gpio_init_irq(struct nmk_gpio_chip *nmk_chip)
-{
- irq_set_chained_handler(nmk_chip->parent_irq, nmk_gpio_irq_handler);
- irq_set_handler_data(nmk_chip->parent_irq, nmk_chip);
-
- if (nmk_chip->latent_parent_irq >= 0) {
- irq_set_chained_handler(nmk_chip->latent_parent_irq,
- nmk_gpio_latent_irq_handler);
- irq_set_handler_data(nmk_chip->latent_parent_irq, nmk_chip);
- }
-
- return 0;
-}
-
/* I/O Functions */

static int nmk_gpio_request(struct gpio_chip *chip, unsigned offset)
@@ -1014,14 +973,6 @@ static int nmk_gpio_make_output(struct gpio_chip *chip, unsigned offset,
return 0;
}

-static int nmk_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
-{
- struct nmk_gpio_chip *nmk_chip =
- container_of(chip, struct nmk_gpio_chip, chip);
-
- return irq_create_mapping(nmk_chip->domain, offset);
-}
-
#ifdef CONFIG_DEBUG_FS

#include <linux/seq_file.h>
@@ -1120,7 +1071,6 @@ static struct gpio_chip nmk_gpio_template = {
.get = nmk_gpio_get_input,
.direction_output = nmk_gpio_make_output,
.set = nmk_gpio_set_output,
- .to_irq = nmk_gpio_to_irq,
.dbg_show = nmk_gpio_dbg_show,
.can_sleep = false,
};
@@ -1221,27 +1171,6 @@ void nmk_gpio_read_pull(int gpio_bank, u32 *pull_up)
}
}

-static int nmk_gpio_irq_map(struct irq_domain *d, unsigned int irq,
- irq_hw_number_t hwirq)
-{
- struct nmk_gpio_chip *nmk_chip = d->host_data;
-
- if (!nmk_chip)
- return -EINVAL;
-
- irq_set_chip_and_handler(irq, &nmk_gpio_irq_chip, handle_edge_irq);
- set_irq_flags(irq, IRQF_VALID);
- irq_set_chip_data(irq, nmk_chip);
- irq_set_irq_type(irq, IRQ_TYPE_EDGE_FALLING);
-
- return 0;
-}
-
-static const struct irq_domain_ops nmk_gpio_irq_simple_ops = {
- .map = nmk_gpio_irq_map,
- .xlate = irq_domain_xlate_twocell,
-};
-
static int nmk_gpio_probe(struct platform_device *dev)
{
struct device_node *np = dev->dev.of_node;
@@ -1321,17 +1250,31 @@ static int nmk_gpio_probe(struct platform_device *dev)

platform_set_drvdata(dev, nmk_chip);

- nmk_chip->domain = irq_domain_add_simple(np,
- NMK_GPIO_PER_CHIP, 0,
- &nmk_gpio_irq_simple_ops, nmk_chip);
- if (!nmk_chip->domain) {
- dev_err(&dev->dev, "failed to create irqdomain\n");
- /* Just do this, no matter if it fails */
+ /*
+ * Let the generic code handle this edge IRQ, the the chained
+ * handler will perform the actual work of handling the parent
+ * interrupt.
+ */
+ ret = gpiochip_irqchip_add(&nmk_chip->chip,
+ &nmk_gpio_irq_chip,
+ 0,
+ handle_edge_irq,
+ IRQ_TYPE_EDGE_FALLING);
+ if (ret) {
+ dev_err(&dev->dev, "could not add irqchip\n");
ret = gpiochip_remove(&nmk_chip->chip);
- return -ENOSYS;
+ return -ENODEV;
}
-
- nmk_gpio_init_irq(nmk_chip);
+ /* Then register the chain on the parent IRQ */
+ gpiochip_set_chained_irqchip(&nmk_chip->chip,
+ &nmk_gpio_irq_chip,
+ nmk_chip->parent_irq,
+ nmk_gpio_irq_handler);
+ if (nmk_chip->latent_parent_irq > 0)
+ gpiochip_set_chained_irqchip(&nmk_chip->chip,
+ &nmk_gpio_irq_chip,
+ nmk_chip->latent_parent_irq,
+ nmk_gpio_latent_irq_handler);

dev_info(&dev->dev, "at address %p\n", nmk_chip->addr);

--
1.8.5.3


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