437 lines
11 KiB
C
437 lines
11 KiB
C
/*
|
|
* 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_irq(): Map a hardware IRQ on a chip to a Linux IRQ
|
|
*
|
|
* @tc3589x_gpio: tc3589x_gpio_irq controller to operate on.
|
|
* @irq: index of the hardware interrupt requested in the chip IRQs
|
|
*
|
|
* Useful for drivers to request their own IRQs.
|
|
*/
|
|
static int tc3589x_gpio_irq_get_irq(struct tc3589x_gpio *tc3589x_gpio,
|
|
int hwirq)
|
|
{
|
|
if (!tc3589x_gpio)
|
|
return -EINVAL;
|
|
|
|
return irq_create_mapping(tc3589x_gpio->domain, hwirq);
|
|
}
|
|
|
|
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_irq(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 = true,
|
|
};
|
|
|
|
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 irq = tc3589x_gpio_irq_get_irq(tc3589x_gpio, line);
|
|
|
|
handle_nested_irq(irq);
|
|
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 irq,
|
|
irq_hw_number_t hwirq)
|
|
{
|
|
struct tc3589x *tc3589x_gpio = d->host_data;
|
|
|
|
irq_set_chip_data(irq, tc3589x_gpio);
|
|
irq_set_chip_and_handler(irq, &tc3589x_gpio_irq_chip,
|
|
handle_simple_irq);
|
|
irq_set_nested_thread(irq, 1);
|
|
#ifdef CONFIG_ARM
|
|
set_irq_flags(irq, IRQF_VALID);
|
|
#else
|
|
irq_set_noprobe(irq);
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void tc3589x_gpio_irq_unmap(struct irq_domain *d, unsigned int irq)
|
|
{
|
|
#ifdef CONFIG_ARM
|
|
set_irq_flags(irq, 0);
|
|
#endif
|
|
irq_set_chip_and_handler(irq, NULL, NULL);
|
|
irq_set_chip_data(irq, 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 this results in a linear domain, irq_create_mapping() will
|
|
* take care of allocating IRQ descriptors at runtime. When a base
|
|
* is provided, the IRQ descriptors will be allocated when the
|
|
* domain is instantiated.
|
|
*/
|
|
tc3589x_gpio->domain = irq_domain_add_simple(np,
|
|
tc3589x_gpio->chip.ngpio, base, &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 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 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);
|
|
|
|
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 = 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");
|