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Subject[PATCH 4/4] pinctrl: coh901: convert driver to use gpiolib irqchip
Date
This converts the COH901 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 | 1 +
drivers/pinctrl/pinctrl-coh901.c | 204 ++++++++++-----------------------------
2 files changed, 54 insertions(+), 151 deletions(-)

diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index a05087bd1955..0c6eb33daa87 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -324,6 +324,7 @@ config PINCTRL_U300
config PINCTRL_COH901
bool "ST-Ericsson U300 COH 901 335/571 GPIO"
depends on GPIOLIB && ARCH_U300 && PINCTRL_U300
+ select GPIOLIB_IRQCHIP
help
Say yes here to support GPIO interface on ST-Ericsson U300.
The names of the two IP block variants supported are
diff --git a/drivers/pinctrl/pinctrl-coh901.c b/drivers/pinctrl/pinctrl-coh901.c
index 749db595640c..d182fdd2e715 100644
--- a/drivers/pinctrl/pinctrl-coh901.c
+++ b/drivers/pinctrl/pinctrl-coh901.c
@@ -8,17 +8,14 @@
* Author: Jonas Aaberg <jonas.aberg@stericsson.com>
*/
#include <linux/module.h>
-#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/io.h>
-#include <linux/irqdomain.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
-#include <linux/list.h>
#include <linux/slab.h>
#include <linux/pinctrl/consumer.h>
#include <linux/pinctrl/pinconf-generic.h>
@@ -61,9 +58,17 @@
#define U300_GPIO_PINS_PER_PORT 8
#define U300_GPIO_MAX (U300_GPIO_PINS_PER_PORT * U300_GPIO_NUM_PORTS)

+struct u300_gpio_port {
+ struct u300_gpio *gpio;
+ char name[8];
+ int irq;
+ int number;
+ u8 toggle_edge_mode;
+};
+
struct u300_gpio {
struct gpio_chip chip;
- struct list_head port_list;
+ struct u300_gpio_port ports[U300_GPIO_NUM_PORTS];
struct clk *clk;
void __iomem *base;
struct device *dev;
@@ -78,16 +83,6 @@ struct u300_gpio {
u32 iev;
};

-struct u300_gpio_port {
- struct list_head node;
- struct u300_gpio *gpio;
- char name[8];
- struct irq_domain *domain;
- int irq;
- int number;
- u8 toggle_edge_mode;
-};
-
/*
* Macro to expand to read a specific register found in the "gpio"
* struct. It requires the struct u300_gpio *gpio variable to exist in
@@ -308,39 +303,6 @@ static int u300_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
return 0;
}

-static int u300_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
-{
- struct u300_gpio *gpio = to_u300_gpio(chip);
- int portno = offset >> 3;
- struct u300_gpio_port *port = NULL;
- struct list_head *p;
- int retirq;
- bool found = false;
-
- list_for_each(p, &gpio->port_list) {
- port = list_entry(p, struct u300_gpio_port, node);
- if (port->number == portno) {
- found = true;
- break;
- }
- }
- if (!found) {
- dev_err(gpio->dev, "could not locate port for GPIO %d IRQ\n",
- offset);
- return -EINVAL;
- }
-
- /*
- * The local hwirqs on the port are the lower three bits, there
- * are exactly 8 IRQs per port since they are 8-bit
- */
- retirq = irq_find_mapping(port->domain, (offset & 0x7));
-
- dev_dbg(gpio->dev, "request IRQ for GPIO %d, return %d from port %d\n",
- offset, retirq, port->number);
- return retirq;
-}
-
/* Returning -EINVAL means "supported but not available" */
int u300_gpio_config_get(struct gpio_chip *chip,
unsigned offset,
@@ -461,7 +423,6 @@ static struct gpio_chip u300_gpio_chip = {
.set = u300_gpio_set,
.direction_input = u300_gpio_direction_input,
.direction_output = u300_gpio_direction_output,
- .to_irq = u300_gpio_to_irq,
};

static void u300_toggle_trigger(struct u300_gpio *gpio, unsigned offset)
@@ -485,9 +446,10 @@ static void u300_toggle_trigger(struct u300_gpio *gpio, unsigned offset)

static int u300_gpio_irq_type(struct irq_data *d, unsigned trigger)
{
- struct u300_gpio_port *port = irq_data_get_irq_chip_data(d);
- struct u300_gpio *gpio = port->gpio;
- int offset = (port->number << 3) + d->hwirq;
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
+ struct u300_gpio *gpio = to_u300_gpio(chip);
+ struct u300_gpio_port *port = &gpio->ports[d->hwirq >> 3];
+ int offset = d->hwirq;
u32 val;

if ((trigger & IRQF_TRIGGER_RISING) &&
@@ -521,9 +483,10 @@ static int u300_gpio_irq_type(struct irq_data *d, unsigned trigger)

static void u300_gpio_irq_enable(struct irq_data *d)
{
- struct u300_gpio_port *port = irq_data_get_irq_chip_data(d);
- struct u300_gpio *gpio = port->gpio;
- int offset = (port->number << 3) + d->hwirq;
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
+ struct u300_gpio *gpio = to_u300_gpio(chip);
+ struct u300_gpio_port *port = &gpio->ports[d->hwirq >> 3];
+ int offset = d->hwirq;
u32 val;
unsigned long flags;

@@ -537,9 +500,9 @@ static void u300_gpio_irq_enable(struct irq_data *d)

static void u300_gpio_irq_disable(struct irq_data *d)
{
- struct u300_gpio_port *port = irq_data_get_irq_chip_data(d);
- struct u300_gpio *gpio = port->gpio;
- int offset = (port->number << 3) + d->hwirq;
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
+ struct u300_gpio *gpio = to_u300_gpio(chip);
+ int offset = d->hwirq;
u32 val;
unsigned long flags;

@@ -549,45 +512,24 @@ static void u300_gpio_irq_disable(struct irq_data *d)
local_irq_restore(flags);
}

-static int u300_gpio_irq_reqres(struct irq_data *d)
-{
- struct u300_gpio_port *port = irq_data_get_irq_chip_data(d);
- struct u300_gpio *gpio = port->gpio;
-
- if (gpio_lock_as_irq(&gpio->chip, d->hwirq)) {
- dev_err(gpio->dev,
- "unable to lock HW IRQ %lu for IRQ\n",
- d->hwirq);
- return -EINVAL;
- }
- return 0;
-}
-
-static void u300_gpio_irq_relres(struct irq_data *d)
-{
- struct u300_gpio_port *port = irq_data_get_irq_chip_data(d);
- struct u300_gpio *gpio = port->gpio;
-
- gpio_unlock_as_irq(&gpio->chip, d->hwirq);
-}
-
static struct irq_chip u300_gpio_irqchip = {
.name = "u300-gpio-irqchip",
.irq_enable = u300_gpio_irq_enable,
.irq_disable = u300_gpio_irq_disable,
.irq_set_type = u300_gpio_irq_type,
- .irq_request_resources = u300_gpio_irq_reqres,
- .irq_release_resources = u300_gpio_irq_relres,
};

static void u300_gpio_irq_handler(unsigned irq, struct irq_desc *desc)
{
- struct u300_gpio_port *port = irq_get_handler_data(irq);
- struct u300_gpio *gpio = port->gpio;
+ struct irq_chip *parent_chip = irq_get_chip(irq);
+ struct gpio_chip *chip = irq_get_handler_data(irq);
+ struct u300_gpio *gpio = to_u300_gpio(chip);
+ struct u300_gpio_port *port = &gpio->ports[irq - chip->base];
int pinoffset = port->number << 3; /* get the right stride */
unsigned long val;

- desc->irq_data.chip->irq_ack(&desc->irq_data);
+ chained_irq_enter(parent_chip, desc);
+
/* Read event register */
val = readl(U300_PIN_REG(pinoffset, iev));
/* Mask relevant bits */
@@ -600,8 +542,8 @@ static void u300_gpio_irq_handler(unsigned irq, struct irq_desc *desc)
int irqoffset;

for_each_set_bit(irqoffset, &val, U300_GPIO_PINS_PER_PORT) {
- int pin_irq = irq_find_mapping(port->domain, irqoffset);
int offset = pinoffset + irqoffset;
+ int pin_irq = irq_find_mapping(chip->irqdomain, offset);

dev_dbg(gpio->dev, "GPIO IRQ %d on pin %d\n",
pin_irq, offset);
@@ -615,7 +557,7 @@ static void u300_gpio_irq_handler(unsigned irq, struct irq_desc *desc)
}
}

- desc->irq_data.chip->irq_unmask(&desc->irq_data);
+ chained_irq_exit(parent_chip, desc);
}

static void __init u300_gpio_init_pin(struct u300_gpio *gpio,
@@ -666,20 +608,6 @@ static void __init u300_gpio_init_coh901571(struct u300_gpio *gpio)
}
}

-static inline void u300_gpio_free_ports(struct u300_gpio *gpio)
-{
- struct u300_gpio_port *port;
- struct list_head *p, *n;
-
- list_for_each_safe(p, n, &gpio->port_list) {
- port = list_entry(p, struct u300_gpio_port, node);
- list_del(&port->node);
- if (port->domain)
- irq_domain_remove(port->domain);
- kfree(port);
- }
-}
-
/*
* Here we map a GPIO in the local gpio_chip pin space to a pin in
* the local pinctrl pin space. The pin controller used is
@@ -770,17 +698,28 @@ static int __init u300_gpio_probe(struct platform_device *pdev)
gpio->base + U300_GPIO_CR);
u300_gpio_init_coh901571(gpio);

+#ifdef CONFIG_OF_GPIO
+ gpio->chip.of_node = pdev->dev.of_node;
+#endif
+ err = gpiochip_add(&gpio->chip);
+ if (err) {
+ dev_err(gpio->dev, "unable to add gpiochip: %d\n", err);
+ goto err_no_chip;
+ }
+
+ err = gpiochip_irqchip_add(&gpio->chip,
+ &u300_gpio_irqchip,
+ 0,
+ handle_simple_irq,
+ IRQ_TYPE_EDGE_FALLING);
+ if (err) {
+ dev_err(gpio->dev, "no GPIO irqchip\n");
+ goto err_no_irqchip;
+ }
+
/* Add each port with its IRQ separately */
- INIT_LIST_HEAD(&gpio->port_list);
for (portno = 0 ; portno < U300_GPIO_NUM_PORTS; portno++) {
- struct u300_gpio_port *port =
- kmalloc(sizeof(struct u300_gpio_port), GFP_KERNEL);
-
- if (!port) {
- dev_err(gpio->dev, "out of memory\n");
- err = -ENOMEM;
- goto err_no_port;
- }
+ struct u300_gpio_port *port = &gpio->ports[portno];

snprintf(port->name, 8, "gpio%d", portno);
port->number = portno;
@@ -788,50 +727,16 @@ static int __init u300_gpio_probe(struct platform_device *pdev)

port->irq = platform_get_irq(pdev, portno);

- dev_dbg(gpio->dev, "register IRQ %d for port %s\n", port->irq,
- port->name);
-
- port->domain = irq_domain_add_linear(pdev->dev.of_node,
- U300_GPIO_PINS_PER_PORT,
- &irq_domain_simple_ops,
- port);
- if (!port->domain) {
- err = -ENOMEM;
- goto err_no_domain;
- }
-
- irq_set_chained_handler(port->irq, u300_gpio_irq_handler);
- irq_set_handler_data(port->irq, port);
-
- /* For each GPIO pin set the unique IRQ handler */
- for (i = 0; i < U300_GPIO_PINS_PER_PORT; i++) {
- int irqno = irq_create_mapping(port->domain, i);
-
- dev_dbg(gpio->dev, "GPIO%d on port %s gets IRQ %d\n",
- gpio->chip.base + (port->number << 3) + i,
- port->name, irqno);
- irq_set_chip_and_handler(irqno, &u300_gpio_irqchip,
- handle_simple_irq);
- set_irq_flags(irqno, IRQF_VALID);
- irq_set_chip_data(irqno, port);
- }
+ gpiochip_set_chained_irqchip(&gpio->chip,
+ &u300_gpio_irqchip,
+ port->irq,
+ u300_gpio_irq_handler);

/* Turns off irq force (test register) for this port */
writel(0x0, gpio->base + portno * gpio->stride + ifr);
-
- list_add_tail(&port->node, &gpio->port_list);
}
dev_dbg(gpio->dev, "initialized %d GPIO ports\n", portno);

-#ifdef CONFIG_OF_GPIO
- gpio->chip.of_node = pdev->dev.of_node;
-#endif
- err = gpiochip_add(&gpio->chip);
- if (err) {
- dev_err(gpio->dev, "unable to add gpiochip: %d\n", err);
- goto err_no_chip;
- }
-
/*
* Add pinctrl pin ranges, the pin controller must be registered
* at this point
@@ -850,12 +755,10 @@ static int __init u300_gpio_probe(struct platform_device *pdev)
return 0;

err_no_range:
+err_no_irqchip:
if (gpiochip_remove(&gpio->chip))
dev_err(&pdev->dev, "failed to remove gpio chip\n");
err_no_chip:
-err_no_domain:
-err_no_port:
- u300_gpio_free_ports(gpio);
clk_disable_unprepare(gpio->clk);
dev_err(&pdev->dev, "module ERROR:%d\n", err);
return err;
@@ -874,7 +777,6 @@ static int __exit u300_gpio_remove(struct platform_device *pdev)
dev_err(gpio->dev, "unable to remove gpiochip: %d\n", err);
return err;
}
- u300_gpio_free_ports(gpio);
clk_disable_unprepare(gpio->clk);
return 0;
}
--
1.8.5.3


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