/* * Copyright (C) ST-Ericsson SA 2010 * * License Terms: GNU General Public License, version 2 * Author: Hanumath Prasad for ST-Ericsson * Author: Rabin Vincent for ST-Ericsson */ #include #include #include #include #include #include #include #include #include #include /* * 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 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); 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 = 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");