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kernel-fxtec-pro1x/drivers/gpio/gpio-tc3589x.c
Lee Jones 3113e67902 gpio: Enable the tc3298x GPIO expander driver for Device Tree 
Here we provide a means to probe and extract vital information
from Device Tree when booting with it enabled. Without this
patch sub-devices wouldn't be able to reference the tc3589x-gpio
expander from Device Tree.

CC: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2012-09-12 23:15:46 +02:00

439 lines
11 KiB
C
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/*
* Copyright (C) ST-Ericsson SA 2010
*
* License Terms: GNU General Public License, version 2
* Author: Hanumath Prasad <hanumath.prasad@stericsson.com> for ST-Ericsson
* Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/gpio.h>
#include <linux/of.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/interrupt.h>
#include <linux/mfd/tc3589x.h>
/*
* These registers are modified under the irq bus lock and cached to avoid
* unnecessary writes in bus_sync_unlock.
*/
enum { REG_IBE, REG_IEV, REG_IS, REG_IE };
#define CACHE_NR_REGS 4
#define CACHE_NR_BANKS 3
struct tc3589x_gpio {
struct gpio_chip chip;
struct tc3589x *tc3589x;
struct device *dev;
struct mutex irq_lock;
struct irq_domain *domain;
int irq_base;
/* Caches of interrupt control registers for bus_lock */
u8 regs[CACHE_NR_REGS][CACHE_NR_BANKS];
u8 oldregs[CACHE_NR_REGS][CACHE_NR_BANKS];
};
static inline struct tc3589x_gpio *to_tc3589x_gpio(struct gpio_chip *chip)
{
return container_of(chip, struct tc3589x_gpio, chip);
}
static int tc3589x_gpio_get(struct gpio_chip *chip, unsigned offset)
{
struct tc3589x_gpio *tc3589x_gpio = to_tc3589x_gpio(chip);
struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
u8 reg = TC3589x_GPIODATA0 + (offset / 8) * 2;
u8 mask = 1 << (offset % 8);
int ret;
ret = tc3589x_reg_read(tc3589x, reg);
if (ret < 0)
return ret;
return ret & mask;
}
static void tc3589x_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
{
struct tc3589x_gpio *tc3589x_gpio = to_tc3589x_gpio(chip);
struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
u8 reg = TC3589x_GPIODATA0 + (offset / 8) * 2;
unsigned pos = offset % 8;
u8 data[] = {!!val << pos, 1 << pos};
tc3589x_block_write(tc3589x, reg, ARRAY_SIZE(data), data);
}
static int tc3589x_gpio_direction_output(struct gpio_chip *chip,
unsigned offset, int val)
{
struct tc3589x_gpio *tc3589x_gpio = to_tc3589x_gpio(chip);
struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
u8 reg = TC3589x_GPIODIR0 + offset / 8;
unsigned pos = offset % 8;
tc3589x_gpio_set(chip, offset, val);
return tc3589x_set_bits(tc3589x, reg, 1 << pos, 1 << pos);
}
static int tc3589x_gpio_direction_input(struct gpio_chip *chip,
unsigned offset)
{
struct tc3589x_gpio *tc3589x_gpio = to_tc3589x_gpio(chip);
struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
u8 reg = TC3589x_GPIODIR0 + offset / 8;
unsigned pos = offset % 8;
return tc3589x_set_bits(tc3589x, reg, 1 << pos, 0);
}
/**
* tc3589x_gpio_irq_get_virq(): Map an interrupt on a chip to a virtual IRQ
*
* @tc3589x_gpio: tc3589x_gpio_irq controller to operate on.
* @irq: index of the interrupt requested in the chip IRQs
*
* Useful for drivers to request their own IRQs.
*/
static int tc3589x_gpio_irq_get_virq(struct tc3589x_gpio *tc3589x_gpio,
int irq)
{
if (!tc3589x_gpio)
return -EINVAL;
return irq_create_mapping(tc3589x_gpio->domain, irq);
}
static int tc3589x_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
{
struct tc3589x_gpio *tc3589x_gpio = to_tc3589x_gpio(chip);
return tc3589x_gpio_irq_get_virq(tc3589x_gpio, offset);
}
static struct gpio_chip template_chip = {
.label = "tc3589x",
.owner = THIS_MODULE,
.direction_input = tc3589x_gpio_direction_input,
.get = tc3589x_gpio_get,
.direction_output = tc3589x_gpio_direction_output,
.set = tc3589x_gpio_set,
.to_irq = tc3589x_gpio_to_irq,
.can_sleep = 1,
};
static int tc3589x_gpio_irq_set_type(struct irq_data *d, unsigned int type)
{
struct tc3589x_gpio *tc3589x_gpio = irq_data_get_irq_chip_data(d);
int offset = d->hwirq;
int regoffset = offset / 8;
int mask = 1 << (offset % 8);
if (type == IRQ_TYPE_EDGE_BOTH) {
tc3589x_gpio->regs[REG_IBE][regoffset] |= mask;
return 0;
}
tc3589x_gpio->regs[REG_IBE][regoffset] &= ~mask;
if (type == IRQ_TYPE_LEVEL_LOW || type == IRQ_TYPE_LEVEL_HIGH)
tc3589x_gpio->regs[REG_IS][regoffset] |= mask;
else
tc3589x_gpio->regs[REG_IS][regoffset] &= ~mask;
if (type == IRQ_TYPE_EDGE_RISING || type == IRQ_TYPE_LEVEL_HIGH)
tc3589x_gpio->regs[REG_IEV][regoffset] |= mask;
else
tc3589x_gpio->regs[REG_IEV][regoffset] &= ~mask;
return 0;
}
static void tc3589x_gpio_irq_lock(struct irq_data *d)
{
struct tc3589x_gpio *tc3589x_gpio = irq_data_get_irq_chip_data(d);
mutex_lock(&tc3589x_gpio->irq_lock);
}
static void tc3589x_gpio_irq_sync_unlock(struct irq_data *d)
{
struct tc3589x_gpio *tc3589x_gpio = irq_data_get_irq_chip_data(d);
struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
static const u8 regmap[] = {
[REG_IBE] = TC3589x_GPIOIBE0,
[REG_IEV] = TC3589x_GPIOIEV0,
[REG_IS] = TC3589x_GPIOIS0,
[REG_IE] = TC3589x_GPIOIE0,
};
int i, j;
for (i = 0; i < CACHE_NR_REGS; i++) {
for (j = 0; j < CACHE_NR_BANKS; j++) {
u8 old = tc3589x_gpio->oldregs[i][j];
u8 new = tc3589x_gpio->regs[i][j];
if (new == old)
continue;
tc3589x_gpio->oldregs[i][j] = new;
tc3589x_reg_write(tc3589x, regmap[i] + j * 8, new);
}
}
mutex_unlock(&tc3589x_gpio->irq_lock);
}
static void tc3589x_gpio_irq_mask(struct irq_data *d)
{
struct tc3589x_gpio *tc3589x_gpio = irq_data_get_irq_chip_data(d);
int offset = d->hwirq;
int regoffset = offset / 8;
int mask = 1 << (offset % 8);
tc3589x_gpio->regs[REG_IE][regoffset] &= ~mask;
}
static void tc3589x_gpio_irq_unmask(struct irq_data *d)
{
struct tc3589x_gpio *tc3589x_gpio = irq_data_get_irq_chip_data(d);
int offset = d->hwirq;
int regoffset = offset / 8;
int mask = 1 << (offset % 8);
tc3589x_gpio->regs[REG_IE][regoffset] |= mask;
}
static struct irq_chip tc3589x_gpio_irq_chip = {
.name = "tc3589x-gpio",
.irq_bus_lock = tc3589x_gpio_irq_lock,
.irq_bus_sync_unlock = tc3589x_gpio_irq_sync_unlock,
.irq_mask = tc3589x_gpio_irq_mask,
.irq_unmask = tc3589x_gpio_irq_unmask,
.irq_set_type = tc3589x_gpio_irq_set_type,
};
static irqreturn_t tc3589x_gpio_irq(int irq, void *dev)
{
struct tc3589x_gpio *tc3589x_gpio = dev;
struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
u8 status[CACHE_NR_BANKS];
int ret;
int i;
ret = tc3589x_block_read(tc3589x, TC3589x_GPIOMIS0,
ARRAY_SIZE(status), status);
if (ret < 0)
return IRQ_NONE;
for (i = 0; i < ARRAY_SIZE(status); i++) {
unsigned int stat = status[i];
if (!stat)
continue;
while (stat) {
int bit = __ffs(stat);
int line = i * 8 + bit;
int virq = tc3589x_gpio_irq_get_virq(tc3589x_gpio, line);
handle_nested_irq(virq);
stat &= ~(1 << bit);
}
tc3589x_reg_write(tc3589x, TC3589x_GPIOIC0 + i, status[i]);
}
return IRQ_HANDLED;
}
static int tc3589x_gpio_irq_map(struct irq_domain *d, unsigned int virq,
irq_hw_number_t hwirq)
{
struct tc3589x *tc3589x_gpio = d->host_data;
irq_set_chip_data(virq, tc3589x_gpio);
irq_set_chip_and_handler(virq, &tc3589x_gpio_irq_chip,
handle_simple_irq);
irq_set_nested_thread(virq, 1);
#ifdef CONFIG_ARM
set_irq_flags(virq, IRQF_VALID);
#else
irq_set_noprobe(virq);
#endif
return 0;
}
static void tc3589x_gpio_irq_unmap(struct irq_domain *d, unsigned int virq)
{
#ifdef CONFIG_ARM
set_irq_flags(virq, 0);
#endif
irq_set_chip_and_handler(virq, NULL, NULL);
irq_set_chip_data(virq, NULL);
}
static struct irq_domain_ops tc3589x_irq_ops = {
.map = tc3589x_gpio_irq_map,
.unmap = tc3589x_gpio_irq_unmap,
.xlate = irq_domain_xlate_twocell,
};
static int tc3589x_gpio_irq_init(struct tc3589x_gpio *tc3589x_gpio,
struct device_node *np)
{
int base = tc3589x_gpio->irq_base;
if (base) {
tc3589x_gpio->domain = irq_domain_add_legacy(
NULL, tc3589x_gpio->chip.ngpio, base,
0, &tc3589x_irq_ops, tc3589x_gpio);
}
else {
tc3589x_gpio->domain = irq_domain_add_linear(
np, tc3589x_gpio->chip.ngpio,
&tc3589x_irq_ops, tc3589x_gpio);
}
if (!tc3589x_gpio->domain) {
dev_err(tc3589x_gpio->dev, "Failed to create irqdomain\n");
return -ENOSYS;
}
return 0;
}
static int __devinit tc3589x_gpio_probe(struct platform_device *pdev)
{
struct tc3589x *tc3589x = dev_get_drvdata(pdev->dev.parent);
struct tc3589x_gpio_platform_data *pdata;
struct device_node *np = pdev->dev.of_node;
struct tc3589x_gpio *tc3589x_gpio;
int ret;
int irq;
pdata = tc3589x->pdata->gpio;
if (!(pdata || np)) {
dev_err(&pdev->dev, "No platform data or Device Tree found\n");
return -EINVAL;
}
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
tc3589x_gpio = kzalloc(sizeof(struct tc3589x_gpio), GFP_KERNEL);
if (!tc3589x_gpio)
return -ENOMEM;
mutex_init(&tc3589x_gpio->irq_lock);
tc3589x_gpio->dev = &pdev->dev;
tc3589x_gpio->tc3589x = tc3589x;
tc3589x_gpio->chip = template_chip;
tc3589x_gpio->chip.ngpio = tc3589x->num_gpio;
tc3589x_gpio->chip.dev = &pdev->dev;
tc3589x_gpio->chip.base = (pdata) ? pdata->gpio_base : -1;
#ifdef CONFIG_OF_GPIO
tc3589x_gpio->chip.of_node = np;
#endif
tc3589x_gpio->irq_base = tc3589x->irq_base ?
tc3589x->irq_base + TC3589x_INT_GPIO(0) : 0;
/* Bring the GPIO module out of reset */
ret = tc3589x_set_bits(tc3589x, TC3589x_RSTCTRL,
TC3589x_RSTCTRL_GPIRST, 0);
if (ret < 0)
goto out_free;
ret = tc3589x_gpio_irq_init(tc3589x_gpio, np);
if (ret)
goto out_free;
ret = request_threaded_irq(irq, NULL, tc3589x_gpio_irq, IRQF_ONESHOT,
"tc3589x-gpio", tc3589x_gpio);
if (ret) {
dev_err(&pdev->dev, "unable to get irq: %d\n", ret);
goto out_free;
}
ret = gpiochip_add(&tc3589x_gpio->chip);
if (ret) {
dev_err(&pdev->dev, "unable to add gpiochip: %d\n", ret);
goto out_freeirq;
}
if (pdata && pdata->setup)
pdata->setup(tc3589x, tc3589x_gpio->chip.base);
platform_set_drvdata(pdev, tc3589x_gpio);
return 0;
out_freeirq:
free_irq(irq, tc3589x_gpio);
out_free:
kfree(tc3589x_gpio);
return ret;
}
static int __devexit tc3589x_gpio_remove(struct platform_device *pdev)
{
struct tc3589x_gpio *tc3589x_gpio = platform_get_drvdata(pdev);
struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
struct tc3589x_gpio_platform_data *pdata = tc3589x->pdata->gpio;
int irq = platform_get_irq(pdev, 0);
int ret;
if (pdata && pdata->remove)
pdata->remove(tc3589x, tc3589x_gpio->chip.base);
ret = gpiochip_remove(&tc3589x_gpio->chip);
if (ret < 0) {
dev_err(tc3589x_gpio->dev,
"unable to remove gpiochip: %d\n", ret);
return ret;
}
free_irq(irq, tc3589x_gpio);
platform_set_drvdata(pdev, NULL);
kfree(tc3589x_gpio);
return 0;
}
static struct platform_driver tc3589x_gpio_driver = {
.driver.name = "tc3589x-gpio",
.driver.owner = THIS_MODULE,
.probe = tc3589x_gpio_probe,
.remove = __devexit_p(tc3589x_gpio_remove),
};
static int __init tc3589x_gpio_init(void)
{
return platform_driver_register(&tc3589x_gpio_driver);
}
subsys_initcall(tc3589x_gpio_init);
static void __exit tc3589x_gpio_exit(void)
{
platform_driver_unregister(&tc3589x_gpio_driver);
}
module_exit(tc3589x_gpio_exit);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("TC3589x GPIO driver");
MODULE_AUTHOR("Hanumath Prasad, Rabin Vincent");
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