+++ /dev/null
-/*
- * 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/irq.h>
-#include <linux/interrupt.h>
-#include <linux/mfd/tc35892.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 tc35892_gpio {
- struct gpio_chip chip;
- struct tc35892 *tc35892;
- struct device *dev;
- struct mutex irq_lock;
-
- 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 tc35892_gpio *to_tc35892_gpio(struct gpio_chip *chip)
-{
- return container_of(chip, struct tc35892_gpio, chip);
-}
-
-static int tc35892_gpio_get(struct gpio_chip *chip, unsigned offset)
-{
- struct tc35892_gpio *tc35892_gpio = to_tc35892_gpio(chip);
- struct tc35892 *tc35892 = tc35892_gpio->tc35892;
- u8 reg = TC35892_GPIODATA0 + (offset / 8) * 2;
- u8 mask = 1 << (offset % 8);
- int ret;
-
- ret = tc35892_reg_read(tc35892, reg);
- if (ret < 0)
- return ret;
-
- return ret & mask;
-}
-
-static void tc35892_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
-{
- struct tc35892_gpio *tc35892_gpio = to_tc35892_gpio(chip);
- struct tc35892 *tc35892 = tc35892_gpio->tc35892;
- u8 reg = TC35892_GPIODATA0 + (offset / 8) * 2;
- unsigned pos = offset % 8;
- u8 data[] = {!!val << pos, 1 << pos};
-
- tc35892_block_write(tc35892, reg, ARRAY_SIZE(data), data);
-}
-
-static int tc35892_gpio_direction_output(struct gpio_chip *chip,
- unsigned offset, int val)
-{
- struct tc35892_gpio *tc35892_gpio = to_tc35892_gpio(chip);
- struct tc35892 *tc35892 = tc35892_gpio->tc35892;
- u8 reg = TC35892_GPIODIR0 + offset / 8;
- unsigned pos = offset % 8;
-
- tc35892_gpio_set(chip, offset, val);
-
- return tc35892_set_bits(tc35892, reg, 1 << pos, 1 << pos);
-}
-
-static int tc35892_gpio_direction_input(struct gpio_chip *chip,
- unsigned offset)
-{
- struct tc35892_gpio *tc35892_gpio = to_tc35892_gpio(chip);
- struct tc35892 *tc35892 = tc35892_gpio->tc35892;
- u8 reg = TC35892_GPIODIR0 + offset / 8;
- unsigned pos = offset % 8;
-
- return tc35892_set_bits(tc35892, reg, 1 << pos, 0);
-}
-
-static int tc35892_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
-{
- struct tc35892_gpio *tc35892_gpio = to_tc35892_gpio(chip);
-
- return tc35892_gpio->irq_base + offset;
-}
-
-static struct gpio_chip template_chip = {
- .label = "tc35892",
- .owner = THIS_MODULE,
- .direction_input = tc35892_gpio_direction_input,
- .get = tc35892_gpio_get,
- .direction_output = tc35892_gpio_direction_output,
- .set = tc35892_gpio_set,
- .to_irq = tc35892_gpio_to_irq,
- .can_sleep = 1,
-};
-
-static int tc35892_gpio_irq_set_type(unsigned int irq, unsigned int type)
-{
- struct tc35892_gpio *tc35892_gpio = get_irq_chip_data(irq);
- int offset = irq - tc35892_gpio->irq_base;
- int regoffset = offset / 8;
- int mask = 1 << (offset % 8);
-
- if (type == IRQ_TYPE_EDGE_BOTH) {
- tc35892_gpio->regs[REG_IBE][regoffset] |= mask;
- return 0;
- }
-
- tc35892_gpio->regs[REG_IBE][regoffset] &= ~mask;
-
- if (type == IRQ_TYPE_LEVEL_LOW || type == IRQ_TYPE_LEVEL_HIGH)
- tc35892_gpio->regs[REG_IS][regoffset] |= mask;
- else
- tc35892_gpio->regs[REG_IS][regoffset] &= ~mask;
-
- if (type == IRQ_TYPE_EDGE_RISING || type == IRQ_TYPE_LEVEL_HIGH)
- tc35892_gpio->regs[REG_IEV][regoffset] |= mask;
- else
- tc35892_gpio->regs[REG_IEV][regoffset] &= ~mask;
-
- return 0;
-}
-
-static void tc35892_gpio_irq_lock(unsigned int irq)
-{
- struct tc35892_gpio *tc35892_gpio = get_irq_chip_data(irq);
-
- mutex_lock(&tc35892_gpio->irq_lock);
-}
-
-static void tc35892_gpio_irq_sync_unlock(unsigned int irq)
-{
- struct tc35892_gpio *tc35892_gpio = get_irq_chip_data(irq);
- struct tc35892 *tc35892 = tc35892_gpio->tc35892;
- static const u8 regmap[] = {
- [REG_IBE] = TC35892_GPIOIBE0,
- [REG_IEV] = TC35892_GPIOIEV0,
- [REG_IS] = TC35892_GPIOIS0,
- [REG_IE] = TC35892_GPIOIE0,
- };
- int i, j;
-
- for (i = 0; i < CACHE_NR_REGS; i++) {
- for (j = 0; j < CACHE_NR_BANKS; j++) {
- u8 old = tc35892_gpio->oldregs[i][j];
- u8 new = tc35892_gpio->regs[i][j];
-
- if (new == old)
- continue;
-
- tc35892_gpio->oldregs[i][j] = new;
- tc35892_reg_write(tc35892, regmap[i] + j * 8, new);
- }
- }
-
- mutex_unlock(&tc35892_gpio->irq_lock);
-}
-
-static void tc35892_gpio_irq_mask(unsigned int irq)
-{
- struct tc35892_gpio *tc35892_gpio = get_irq_chip_data(irq);
- int offset = irq - tc35892_gpio->irq_base;
- int regoffset = offset / 8;
- int mask = 1 << (offset % 8);
-
- tc35892_gpio->regs[REG_IE][regoffset] &= ~mask;
-}
-
-static void tc35892_gpio_irq_unmask(unsigned int irq)
-{
- struct tc35892_gpio *tc35892_gpio = get_irq_chip_data(irq);
- int offset = irq - tc35892_gpio->irq_base;
- int regoffset = offset / 8;
- int mask = 1 << (offset % 8);
-
- tc35892_gpio->regs[REG_IE][regoffset] |= mask;
-}
-
-static struct irq_chip tc35892_gpio_irq_chip = {
- .name = "tc35892-gpio",
- .bus_lock = tc35892_gpio_irq_lock,
- .bus_sync_unlock = tc35892_gpio_irq_sync_unlock,
- .mask = tc35892_gpio_irq_mask,
- .unmask = tc35892_gpio_irq_unmask,
- .set_type = tc35892_gpio_irq_set_type,
-};
-
-static irqreturn_t tc35892_gpio_irq(int irq, void *dev)
-{
- struct tc35892_gpio *tc35892_gpio = dev;
- struct tc35892 *tc35892 = tc35892_gpio->tc35892;
- u8 status[CACHE_NR_BANKS];
- int ret;
- int i;
-
- ret = tc35892_block_read(tc35892, TC35892_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;
-
- handle_nested_irq(tc35892_gpio->irq_base + line);
- stat &= ~(1 << bit);
- }
-
- tc35892_reg_write(tc35892, TC35892_GPIOIC0 + i, status[i]);
- }
-
- return IRQ_HANDLED;
-}
-
-static int tc35892_gpio_irq_init(struct tc35892_gpio *tc35892_gpio)
-{
- int base = tc35892_gpio->irq_base;
- int irq;
-
- for (irq = base; irq < base + tc35892_gpio->chip.ngpio; irq++) {
- set_irq_chip_data(irq, tc35892_gpio);
- set_irq_chip_and_handler(irq, &tc35892_gpio_irq_chip,
- handle_simple_irq);
- set_irq_nested_thread(irq, 1);
-#ifdef CONFIG_ARM
- set_irq_flags(irq, IRQF_VALID);
-#else
- set_irq_noprobe(irq);
-#endif
- }
-
- return 0;
-}
-
-static void tc35892_gpio_irq_remove(struct tc35892_gpio *tc35892_gpio)
-{
- int base = tc35892_gpio->irq_base;
- int irq;
-
- for (irq = base; irq < base + tc35892_gpio->chip.ngpio; irq++) {
-#ifdef CONFIG_ARM
- set_irq_flags(irq, 0);
-#endif
- set_irq_chip_and_handler(irq, NULL, NULL);
- set_irq_chip_data(irq, NULL);
- }
-}
-
-static int __devinit tc35892_gpio_probe(struct platform_device *pdev)
-{
- struct tc35892 *tc35892 = dev_get_drvdata(pdev->dev.parent);
- struct tc35892_gpio_platform_data *pdata;
- struct tc35892_gpio *tc35892_gpio;
- int ret;
- int irq;
-
- pdata = tc35892->pdata->gpio;
- if (!pdata)
- return -ENODEV;
-
- irq = platform_get_irq(pdev, 0);
- if (irq < 0)
- return irq;
-
- tc35892_gpio = kzalloc(sizeof(struct tc35892_gpio), GFP_KERNEL);
- if (!tc35892_gpio)
- return -ENOMEM;
-
- mutex_init(&tc35892_gpio->irq_lock);
-
- tc35892_gpio->dev = &pdev->dev;
- tc35892_gpio->tc35892 = tc35892;
-
- tc35892_gpio->chip = template_chip;
- tc35892_gpio->chip.ngpio = tc35892->num_gpio;
- tc35892_gpio->chip.dev = &pdev->dev;
- tc35892_gpio->chip.base = pdata->gpio_base;
-
- tc35892_gpio->irq_base = tc35892->irq_base + TC35892_INT_GPIO(0);
-
- /* Bring the GPIO module out of reset */
- ret = tc35892_set_bits(tc35892, TC35892_RSTCTRL,
- TC35892_RSTCTRL_GPIRST, 0);
- if (ret < 0)
- goto out_free;
-
- ret = tc35892_gpio_irq_init(tc35892_gpio);
- if (ret)
- goto out_free;
-
- ret = request_threaded_irq(irq, NULL, tc35892_gpio_irq, IRQF_ONESHOT,
- "tc35892-gpio", tc35892_gpio);
- if (ret) {
- dev_err(&pdev->dev, "unable to get irq: %d\n", ret);
- goto out_removeirq;
- }
-
- ret = gpiochip_add(&tc35892_gpio->chip);
- if (ret) {
- dev_err(&pdev->dev, "unable to add gpiochip: %d\n", ret);
- goto out_freeirq;
- }
-
- if (pdata->setup)
- pdata->setup(tc35892, tc35892_gpio->chip.base);
-
- platform_set_drvdata(pdev, tc35892_gpio);
-
- return 0;
-
-out_freeirq:
- free_irq(irq, tc35892_gpio);
-out_removeirq:
- tc35892_gpio_irq_remove(tc35892_gpio);
-out_free:
- kfree(tc35892_gpio);
- return ret;
-}
-
-static int __devexit tc35892_gpio_remove(struct platform_device *pdev)
-{
- struct tc35892_gpio *tc35892_gpio = platform_get_drvdata(pdev);
- struct tc35892 *tc35892 = tc35892_gpio->tc35892;
- struct tc35892_gpio_platform_data *pdata = tc35892->pdata->gpio;
- int irq = platform_get_irq(pdev, 0);
- int ret;
-
- if (pdata->remove)
- pdata->remove(tc35892, tc35892_gpio->chip.base);
-
- ret = gpiochip_remove(&tc35892_gpio->chip);
- if (ret < 0) {
- dev_err(tc35892_gpio->dev,
- "unable to remove gpiochip: %d\n", ret);
- return ret;
- }
-
- free_irq(irq, tc35892_gpio);
- tc35892_gpio_irq_remove(tc35892_gpio);
-
- platform_set_drvdata(pdev, NULL);
- kfree(tc35892_gpio);
-
- return 0;
-}
-
-static struct platform_driver tc35892_gpio_driver = {
- .driver.name = "tc35892-gpio",
- .driver.owner = THIS_MODULE,
- .probe = tc35892_gpio_probe,
- .remove = __devexit_p(tc35892_gpio_remove),
-};
-
-static int __init tc35892_gpio_init(void)
-{
- return platform_driver_register(&tc35892_gpio_driver);
-}
-subsys_initcall(tc35892_gpio_init);
-
-static void __exit tc35892_gpio_exit(void)
-{
- platform_driver_unregister(&tc35892_gpio_driver);
-}
-module_exit(tc35892_gpio_exit);
-
-MODULE_LICENSE("GPL v2");
-MODULE_DESCRIPTION("TC35892 GPIO driver");
-MODULE_AUTHOR("Hanumath Prasad, Rabin Vincent");
projects / mv-sheeva.git / blobdiff