| /* |
| * 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/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 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"); |