diff options
Diffstat (limited to 'arch/arm/mach-davinci/gpio.c')
| -rw-r--r-- | arch/arm/mach-davinci/gpio.c | 105 |
1 files changed, 99 insertions, 6 deletions
diff --git a/arch/arm/mach-davinci/gpio.c b/arch/arm/mach-davinci/gpio.c index 1b6532159c5..f6ea9db11f4 100644 --- a/arch/arm/mach-davinci/gpio.c +++ b/arch/arm/mach-davinci/gpio.c @@ -34,6 +34,7 @@ static DEFINE_SPINLOCK(gpio_lock); struct davinci_gpio { struct gpio_chip chip; struct gpio_controller *__iomem regs; + int irq_base; }; static struct davinci_gpio chips[DIV_ROUND_UP(DAVINCI_N_GPIO, 32)]; @@ -161,8 +162,7 @@ pure_initcall(davinci_gpio_setup); * used as output pins ... which is convenient for testing. * * NOTE: The first few GPIOs also have direct INTC hookups in addition - * to their GPIOBNK0 irq, with a bit less overhead but less flexibility - * on triggering (e.g. no edge options). We don't try to use those. + * to their GPIOBNK0 irq, with a bit less overhead. * * All those INTC hookups (direct, plus several IRQ banks) can also * serve as EDMA event triggers. @@ -171,7 +171,7 @@ pure_initcall(davinci_gpio_setup); static void gpio_irq_disable(unsigned irq) { struct gpio_controller *__iomem g = get_irq_chip_data(irq); - u32 mask = __gpio_mask(irq_to_gpio(irq)); + u32 mask = (u32) get_irq_data(irq); __raw_writel(mask, &g->clr_falling); __raw_writel(mask, &g->clr_rising); @@ -180,7 +180,7 @@ static void gpio_irq_disable(unsigned irq) static void gpio_irq_enable(unsigned irq) { struct gpio_controller *__iomem g = get_irq_chip_data(irq); - u32 mask = __gpio_mask(irq_to_gpio(irq)); + u32 mask = (u32) get_irq_data(irq); unsigned status = irq_desc[irq].status; status &= IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING; @@ -196,7 +196,7 @@ static void gpio_irq_enable(unsigned irq) static int gpio_irq_type(unsigned irq, unsigned trigger) { struct gpio_controller *__iomem g = get_irq_chip_data(irq); - u32 mask = __gpio_mask(irq_to_gpio(irq)); + u32 mask = (u32) get_irq_data(irq); if (trigger & ~(IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)) return -EINVAL; @@ -260,6 +260,45 @@ gpio_irq_handler(unsigned irq, struct irq_desc *desc) /* now it may re-trigger */ } +static int gpio_to_irq_banked(struct gpio_chip *chip, unsigned offset) +{ + struct davinci_gpio *d = container_of(chip, struct davinci_gpio, chip); + + if (d->irq_base >= 0) + return d->irq_base + offset; + else + return -ENODEV; +} + +static int gpio_to_irq_unbanked(struct gpio_chip *chip, unsigned offset) +{ + struct davinci_soc_info *soc_info = &davinci_soc_info; + + /* NOTE: we assume for now that only irqs in the first gpio_chip + * can provide direct-mapped IRQs to AINTC (up to 32 GPIOs). + */ + if (offset < soc_info->gpio_unbanked) + return soc_info->gpio_irq + offset; + else + return -ENODEV; +} + +static int gpio_irq_type_unbanked(unsigned irq, unsigned trigger) +{ + struct gpio_controller *__iomem g = get_irq_chip_data(irq); + u32 mask = (u32) get_irq_data(irq); + + if (trigger & ~(IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)) + return -EINVAL; + + __raw_writel(mask, (trigger & IRQ_TYPE_EDGE_FALLING) + ? &g->set_falling : &g->clr_falling); + __raw_writel(mask, (trigger & IRQ_TYPE_EDGE_RISING) + ? &g->set_rising : &g->clr_rising); + + return 0; +} + /* * NOTE: for suspend/resume, probably best to make a platform_device with * suspend_late/resume_resume calls hooking into results of the set_wake() @@ -275,6 +314,7 @@ static int __init davinci_gpio_irq_setup(void) u32 binten = 0; unsigned ngpio, bank_irq; struct davinci_soc_info *soc_info = &davinci_soc_info; + struct gpio_controller *__iomem g; ngpio = soc_info->gpio_num; @@ -292,12 +332,63 @@ static int __init davinci_gpio_irq_setup(void) } clk_enable(clk); + /* Arrange gpio_to_irq() support, handling either direct IRQs or + * banked IRQs. Having GPIOs in the first GPIO bank use direct + * IRQs, while the others use banked IRQs, would need some setup + * tweaks to recognize hardware which can do that. + */ + for (gpio = 0, bank = 0; gpio < ngpio; bank++, gpio += 32) { + chips[bank].chip.to_irq = gpio_to_irq_banked; + chips[bank].irq_base = soc_info->gpio_unbanked + ? -EINVAL + : (soc_info->intc_irq_num + gpio); + } + + /* + * AINTC can handle direct/unbanked IRQs for GPIOs, with the GPIO + * controller only handling trigger modes. We currently assume no + * IRQ mux conflicts; gpio_irq_type_unbanked() is only for GPIOs. + */ + if (soc_info->gpio_unbanked) { + static struct irq_chip gpio_irqchip_unbanked; + + /* pass "bank 0" GPIO IRQs to AINTC */ + chips[0].chip.to_irq = gpio_to_irq_unbanked; + binten = BIT(0); + + /* AINTC handles mask/unmask; GPIO handles triggering */ + irq = bank_irq; + gpio_irqchip_unbanked = *get_irq_desc_chip(irq_to_desc(irq)); + gpio_irqchip_unbanked.name = "GPIO-AINTC"; + gpio_irqchip_unbanked.set_type = gpio_irq_type_unbanked; + + /* default trigger: both edges */ + g = gpio2controller(0); + __raw_writel(~0, &g->set_falling); + __raw_writel(~0, &g->set_rising); + + /* set the direct IRQs up to use that irqchip */ + for (gpio = 0; gpio < soc_info->gpio_unbanked; gpio++, irq++) { + set_irq_chip(irq, &gpio_irqchip_unbanked); + set_irq_data(irq, (void *) __gpio_mask(gpio)); + set_irq_chip_data(irq, g); + irq_desc[irq].status |= IRQ_TYPE_EDGE_BOTH; + } + + goto done; + } + + /* + * Or, AINTC can handle IRQs for banks of 16 GPIO IRQs, which we + * then chain through our own handler. + */ for (gpio = 0, irq = gpio_to_irq(0), bank = 0; gpio < ngpio; bank++, bank_irq++) { - struct gpio_controller *__iomem g = gpio2controller(gpio); unsigned i; + /* disabled by default, enabled only as needed */ + g = gpio2controller(gpio); __raw_writel(~0, &g->clr_falling); __raw_writel(~0, &g->clr_rising); @@ -309,6 +400,7 @@ static int __init davinci_gpio_irq_setup(void) for (i = 0; i < 16 && gpio < ngpio; i++, irq++, gpio++) { set_irq_chip(irq, &gpio_irqchip); set_irq_chip_data(irq, g); + set_irq_data(irq, (void *) __gpio_mask(gpio)); set_irq_handler(irq, handle_simple_irq); set_irq_flags(irq, IRQF_VALID); } @@ -316,6 +408,7 @@ static int __init davinci_gpio_irq_setup(void) binten |= BIT(bank); } +done: /* BINTEN -- per-bank interrupt enable. genirq would also let these * bits be set/cleared dynamically. */ |