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linux-pinenote/arch/arm/mach-u300/gpio.c
Uwe Kleine-König 421f91d21a fix typos concerning "initiali[zs]e" 
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2010-06-16 18:05:05 +02:00

700 lines
19 KiB
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/*
*
* arch/arm/mach-u300/gpio.c
*
*
* Copyright (C) 2007-2009 ST-Ericsson AB
* License terms: GNU General Public License (GPL) version 2
* U300 GPIO module.
* This can driver either of the two basic GPIO cores
* available in the U300 platforms:
* COH 901 335 - Used in DB3150 (U300 1.0) and DB3200 (U330 1.0)
* COH 901 571/3 - Used in DB3210 (U365 2.0) and DB3350 (U335 1.0)
* Notice that you also have inline macros in <asm-arch/gpio.h>
* Author: Linus Walleij <linus.walleij@stericsson.com>
* Author: Jonas Aaberg <jonas.aberg@stericsson.com>
*
*/
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
/* Reference to GPIO block clock */
static struct clk *clk;
/* Memory resource */
static struct resource *memres;
static void __iomem *virtbase;
static struct device *gpiodev;
struct u300_gpio_port {
const char *name;
int irq;
int number;
};
static struct u300_gpio_port gpio_ports[] = {
{
.name = "gpio0",
.number = 0,
},
{
.name = "gpio1",
.number = 1,
},
{
.name = "gpio2",
.number = 2,
},
#ifdef U300_COH901571_3
{
.name = "gpio3",
.number = 3,
},
{
.name = "gpio4",
.number = 4,
},
#ifdef CONFIG_MACH_U300_BS335
{
.name = "gpio5",
.number = 5,
},
{
.name = "gpio6",
.number = 6,
},
#endif
#endif
};
#ifdef U300_COH901571_3
/* Default input value */
#define DEFAULT_OUTPUT_LOW 0
#define DEFAULT_OUTPUT_HIGH 1
/* GPIO Pull-Up status */
#define DISABLE_PULL_UP 0
#define ENABLE_PULL_UP 1
#define GPIO_NOT_USED 0
#define GPIO_IN 1
#define GPIO_OUT 2
struct u300_gpio_configuration_data {
unsigned char pin_usage;
unsigned char default_output_value;
unsigned char pull_up;
};
/* Initial configuration */
const struct u300_gpio_configuration_data
u300_gpio_config[U300_GPIO_NUM_PORTS][U300_GPIO_PINS_PER_PORT] = {
#ifdef CONFIG_MACH_U300_BS335
/* Port 0, pins 0-7 */
{
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_OUT, DEFAULT_OUTPUT_HIGH, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}
},
/* Port 1, pins 0-7 */
{
{GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_OUT, DEFAULT_OUTPUT_HIGH, DISABLE_PULL_UP},
{GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}
},
/* Port 2, pins 0-7 */
{
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
{GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}
},
/* Port 3, pins 0-7 */
{
{GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
{GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}
},
/* Port 4, pins 0-7 */
{
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}
},
/* Port 5, pins 0-7 */
{
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}
},
/* Port 6, pind 0-7 */
{
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}
}
#endif
#ifdef CONFIG_MACH_U300_BS365
/* Port 0, pins 0-7 */
{
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}
},
/* Port 1, pins 0-7 */
{
{GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_OUT, DEFAULT_OUTPUT_HIGH, DISABLE_PULL_UP},
{GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}
},
/* Port 2, pins 0-7 */
{
{GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
{GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}
},
/* Port 3, pins 0-7 */
{
{GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}
},
/* Port 4, pins 0-7 */
{
{GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
{GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
/* These 4 pins doesn't exist on DB3210 */
{GPIO_OUT, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
{GPIO_OUT, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
{GPIO_OUT, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
{GPIO_OUT, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}
}
#endif
};
#endif
/* No users == we can power down GPIO */
static int gpio_users;
struct gpio_struct {
int (*callback)(void *);
void *data;
int users;
};
static struct gpio_struct gpio_pin[U300_GPIO_MAX];
/*
* Let drivers register callback in order to get notified when there is
* an interrupt on the gpio pin
*/
int gpio_register_callback(unsigned gpio, int (*func)(void *arg), void *data)
{
if (gpio_pin[gpio].callback)
dev_warn(gpiodev, "%s: WARNING: callback already "
"registered for gpio pin#%d\n", __func__, gpio);
gpio_pin[gpio].callback = func;
gpio_pin[gpio].data = data;
return 0;
}
EXPORT_SYMBOL(gpio_register_callback);
int gpio_unregister_callback(unsigned gpio)
{
if (!gpio_pin[gpio].callback)
dev_warn(gpiodev, "%s: WARNING: callback already "
"unregistered for gpio pin#%d\n", __func__, gpio);
gpio_pin[gpio].callback = NULL;
gpio_pin[gpio].data = NULL;
return 0;
}
EXPORT_SYMBOL(gpio_unregister_callback);
/* Non-zero means valid */
int gpio_is_valid(int number)
{
if (number >= 0 &&
number < (U300_GPIO_NUM_PORTS * U300_GPIO_PINS_PER_PORT))
return 1;
return 0;
}
EXPORT_SYMBOL(gpio_is_valid);
int gpio_request(unsigned gpio, const char *label)
{
if (gpio_pin[gpio].users)
return -EINVAL;
else
gpio_pin[gpio].users++;
gpio_users++;
return 0;
}
EXPORT_SYMBOL(gpio_request);
void gpio_free(unsigned gpio)
{
gpio_users--;
gpio_pin[gpio].users--;
if (unlikely(gpio_pin[gpio].users < 0)) {
dev_warn(gpiodev, "warning: gpio#%d release mismatch\n",
gpio);
gpio_pin[gpio].users = 0;
}
return;
}
EXPORT_SYMBOL(gpio_free);
/* This returns zero or nonzero */
int gpio_get_value(unsigned gpio)
{
return readl(virtbase + U300_GPIO_PXPDIR +
PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING) & (1 << (gpio & 0x07));
}
EXPORT_SYMBOL(gpio_get_value);
/*
* We hope that the compiler will optimize away the unused branch
* in case "value" is a constant
*/
void gpio_set_value(unsigned gpio, int value)
{
u32 val;
unsigned long flags;
local_irq_save(flags);
if (value) {
/* set */
val = readl(virtbase + U300_GPIO_PXPDOR +
PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING)
& (1 << (gpio & 0x07));
writel(val | (1 << (gpio & 0x07)), virtbase +
U300_GPIO_PXPDOR +
PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING);
} else {
/* clear */
val = readl(virtbase + U300_GPIO_PXPDOR +
PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING)
& (1 << (gpio & 0x07));
writel(val & ~(1 << (gpio & 0x07)), virtbase +
U300_GPIO_PXPDOR +
PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING);
}
local_irq_restore(flags);
}
EXPORT_SYMBOL(gpio_set_value);
int gpio_direction_input(unsigned gpio)
{
unsigned long flags;
u32 val;
if (gpio > U300_GPIO_MAX)
return -EINVAL;
local_irq_save(flags);
val = readl(virtbase + U300_GPIO_PXPCR + PIN_TO_PORT(gpio) *
U300_GPIO_PORTX_SPACING);
/* Mask out this pin*/
val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK << ((gpio & 0x07) << 1));
/* This is not needed since it sets the bits to zero.*/
/* val |= (U300_GPIO_PXPCR_PIN_MODE_INPUT << (gpio*2)); */
writel(val, virtbase + U300_GPIO_PXPCR + PIN_TO_PORT(gpio) *
U300_GPIO_PORTX_SPACING);
local_irq_restore(flags);
return 0;
}
EXPORT_SYMBOL(gpio_direction_input);
int gpio_direction_output(unsigned gpio, int value)
{
unsigned long flags;
u32 val;
if (gpio > U300_GPIO_MAX)
return -EINVAL;
local_irq_save(flags);
val = readl(virtbase + U300_GPIO_PXPCR + PIN_TO_PORT(gpio) *
U300_GPIO_PORTX_SPACING);
/* Mask out this pin */
val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK << ((gpio & 0x07) << 1));
/*
* FIXME: configure for push/pull, open drain or open source per pin
* in setup. The current driver will only support push/pull.
*/
val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL
<< ((gpio & 0x07) << 1));
writel(val, virtbase + U300_GPIO_PXPCR + PIN_TO_PORT(gpio) *
U300_GPIO_PORTX_SPACING);
gpio_set_value(gpio, value);
local_irq_restore(flags);
return 0;
}
EXPORT_SYMBOL(gpio_direction_output);
/*
* Enable an IRQ, edge is rising edge (!= 0) or falling edge (==0).
*/
void enable_irq_on_gpio_pin(unsigned gpio, int edge)
{
u32 val;
unsigned long flags;
local_irq_save(flags);
val = readl(virtbase + U300_GPIO_PXIEN + PIN_TO_PORT(gpio) *
U300_GPIO_PORTX_SPACING);
val |= (1 << (gpio & 0x07));
writel(val, virtbase + U300_GPIO_PXIEN + PIN_TO_PORT(gpio) *
U300_GPIO_PORTX_SPACING);
val = readl(virtbase + U300_GPIO_PXICR + PIN_TO_PORT(gpio) *
U300_GPIO_PORTX_SPACING);
if (edge)
val |= (1 << (gpio & 0x07));
else
val &= ~(1 << (gpio & 0x07));
writel(val, virtbase + U300_GPIO_PXICR + PIN_TO_PORT(gpio) *
U300_GPIO_PORTX_SPACING);
local_irq_restore(flags);
}
EXPORT_SYMBOL(enable_irq_on_gpio_pin);
void disable_irq_on_gpio_pin(unsigned gpio)
{
u32 val;
unsigned long flags;
local_irq_save(flags);
val = readl(virtbase + U300_GPIO_PXIEN + PIN_TO_PORT(gpio) *
U300_GPIO_PORTX_SPACING);
val &= ~(1 << (gpio & 0x07));
writel(val, virtbase + U300_GPIO_PXIEN + PIN_TO_PORT(gpio) *
U300_GPIO_PORTX_SPACING);
local_irq_restore(flags);
}
EXPORT_SYMBOL(disable_irq_on_gpio_pin);
/* Enable (value == 0) or disable (value == 1) internal pullup */
void gpio_pullup(unsigned gpio, int value)
{
u32 val;
unsigned long flags;
local_irq_save(flags);
if (value) {
val = readl(virtbase + U300_GPIO_PXPER + PIN_TO_PORT(gpio) *
U300_GPIO_PORTX_SPACING);
writel(val | (1 << (gpio & 0x07)), virtbase + U300_GPIO_PXPER +
PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING);
} else {
val = readl(virtbase + U300_GPIO_PXPER + PIN_TO_PORT(gpio) *
U300_GPIO_PORTX_SPACING);
writel(val & ~(1 << (gpio & 0x07)), virtbase + U300_GPIO_PXPER +
PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING);
}
local_irq_restore(flags);
}
EXPORT_SYMBOL(gpio_pullup);
static irqreturn_t gpio_irq_handler(int irq, void *dev_id)
{
struct u300_gpio_port *port = dev_id;
u32 val;
int pin;
/* Read event register */
val = readl(virtbase + U300_GPIO_PXIEV + port->number *
U300_GPIO_PORTX_SPACING);
/* Mask with enable register */
val &= readl(virtbase + U300_GPIO_PXIEV + port->number *
U300_GPIO_PORTX_SPACING);
/* Mask relevant bits */
val &= U300_GPIO_PXIEV_ALL_IRQ_EVENT_MASK;
/* ACK IRQ (clear event) */
writel(val, virtbase + U300_GPIO_PXIEV + port->number *
U300_GPIO_PORTX_SPACING);
/* Print message */
while (val != 0) {
unsigned gpio;
pin = __ffs(val);
/* mask off this pin */
val &= ~(1 << pin);
gpio = (port->number << 3) + pin;
if (gpio_pin[gpio].callback)
(void)gpio_pin[gpio].callback(gpio_pin[gpio].data);
else
dev_dbg(gpiodev, "stray GPIO IRQ on line %d\n",
gpio);
}
return IRQ_HANDLED;
}
static void gpio_set_initial_values(void)
{
#ifdef U300_COH901571_3
int i, j;
unsigned long flags;
u32 val;
/* Write default values to all pins */
for (i = 0; i < U300_GPIO_NUM_PORTS; i++) {
val = 0;
for (j = 0; j < 8; j++)
val |= (u32) (u300_gpio_config[i][j].default_output_value != DEFAULT_OUTPUT_LOW) << j;
local_irq_save(flags);
writel(val, virtbase + U300_GPIO_PXPDOR + i * U300_GPIO_PORTX_SPACING);
local_irq_restore(flags);
}
/*
* Put all pins that are set to either 'GPIO_OUT' or 'GPIO_NOT_USED'
* to output and 'GPIO_IN' to input for each port. And initialize
* default value on outputs.
*/
for (i = 0; i < U300_GPIO_NUM_PORTS; i++) {
for (j = 0; j < U300_GPIO_PINS_PER_PORT; j++) {
local_irq_save(flags);
val = readl(virtbase + U300_GPIO_PXPCR +
i * U300_GPIO_PORTX_SPACING);
/* Mask out this pin */
val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK << (j << 1));
if (u300_gpio_config[i][j].pin_usage != GPIO_IN)
val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL << (j << 1));
writel(val, virtbase + U300_GPIO_PXPCR +
i * U300_GPIO_PORTX_SPACING);
local_irq_restore(flags);
}
}
/* Enable or disable the internal pull-ups in the GPIO ASIC block */
for (i = 0; i < U300_GPIO_MAX; i++) {
val = 0;
for (j = 0; j < 8; j++)
val |= (u32)((u300_gpio_config[i][j].pull_up == DISABLE_PULL_UP) << j);
local_irq_save(flags);
writel(val, virtbase + U300_GPIO_PXPER + i * U300_GPIO_PORTX_SPACING);
local_irq_restore(flags);
}
#endif
}
static int __init gpio_probe(struct platform_device *pdev)
{
u32 val;
int err = 0;
int i;
int num_irqs;
gpiodev = &pdev->dev;
memset(gpio_pin, 0, sizeof(gpio_pin));
/* Get GPIO clock */
clk = clk_get(&pdev->dev, NULL);
if (IS_ERR(clk)) {
err = PTR_ERR(clk);
dev_err(gpiodev, "could not get GPIO clock\n");
goto err_no_clk;
}
err = clk_enable(clk);
if (err) {
dev_err(gpiodev, "could not enable GPIO clock\n");
goto err_no_clk_enable;
}
memres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!memres)
goto err_no_resource;
if (request_mem_region(memres->start, memres->end - memres->start, "GPIO Controller")
== NULL) {
err = -ENODEV;
goto err_no_ioregion;
}
virtbase = ioremap(memres->start, resource_size(memres));
if (!virtbase) {
err = -ENOMEM;
goto err_no_ioremap;
}
dev_info(gpiodev, "remapped 0x%08x to %p\n",
memres->start, virtbase);
#ifdef U300_COH901335
dev_info(gpiodev, "initializing GPIO Controller COH 901 335\n");
/* Turn on the GPIO block */
writel(U300_GPIO_CR_BLOCK_CLOCK_ENABLE, virtbase + U300_GPIO_CR);
#endif
#ifdef U300_COH901571_3
dev_info(gpiodev, "initializing GPIO Controller COH 901 571/3\n");
val = readl(virtbase + U300_GPIO_CR);
dev_info(gpiodev, "COH901571/3 block version: %d, " \
"number of cores: %d\n",
((val & 0x0000FE00) >> 9),
((val & 0x000001FC) >> 2));
writel(U300_GPIO_CR_BLOCK_CLKRQ_ENABLE, virtbase + U300_GPIO_CR);
#endif
gpio_set_initial_values();
for (num_irqs = 0 ; num_irqs < U300_GPIO_NUM_PORTS; num_irqs++) {
gpio_ports[num_irqs].irq =
platform_get_irq_byname(pdev,
gpio_ports[num_irqs].name);
err = request_irq(gpio_ports[num_irqs].irq,
gpio_irq_handler, IRQF_DISABLED,
gpio_ports[num_irqs].name,
&gpio_ports[num_irqs]);
if (err) {
dev_err(gpiodev, "cannot allocate IRQ for %s!\n",
gpio_ports[num_irqs].name);
goto err_no_irq;
}
/* Turns off PortX_irq_force */
writel(0x0, virtbase + U300_GPIO_PXIFR +
num_irqs * U300_GPIO_PORTX_SPACING);
}
return 0;
err_no_irq:
for (i = 0; i < num_irqs; i++)
free_irq(gpio_ports[i].irq, &gpio_ports[i]);
iounmap(virtbase);
err_no_ioremap:
release_mem_region(memres->start, memres->end - memres->start);
err_no_ioregion:
err_no_resource:
clk_disable(clk);
err_no_clk_enable:
clk_put(clk);
err_no_clk:
dev_info(gpiodev, "module ERROR:%d\n", err);
return err;
}
static int __exit gpio_remove(struct platform_device *pdev)
{
int i;
/* Turn off the GPIO block */
writel(0x00000000U, virtbase + U300_GPIO_CR);
for (i = 0 ; i < U300_GPIO_NUM_PORTS; i++)
free_irq(gpio_ports[i].irq, &gpio_ports[i]);
iounmap(virtbase);
release_mem_region(memres->start, memres->end - memres->start);
clk_disable(clk);
clk_put(clk);
return 0;
}
static struct platform_driver gpio_driver = {
.driver = {
.name = "u300-gpio",
},
.remove = __exit_p(gpio_remove),
};
static int __init u300_gpio_init(void)
{
return platform_driver_probe(&gpio_driver, gpio_probe);
}
static void __exit u300_gpio_exit(void)
{
platform_driver_unregister(&gpio_driver);
}
arch_initcall(u300_gpio_init);
module_exit(u300_gpio_exit);
MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
#ifdef U300_COH901571_3
MODULE_DESCRIPTION("ST-Ericsson AB COH 901 571/3 GPIO driver");
#endif
#ifdef U300_COH901335
MODULE_DESCRIPTION("ST-Ericsson AB COH 901 335 GPIO driver");
#endif
MODULE_LICENSE("GPL");
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