diff options
author | Kumar Gala <galak@kernel.crashing.org> | 2007-02-12 23:57:21 -0600 |
---|---|---|
committer | Kumar Gala <galak@kernel.crashing.org> | 2007-02-12 23:57:21 -0600 |
commit | 54c66f6d781e03dc0b23956234963c4911e6d1c0 (patch) | |
tree | 40619a66ae6d8703a57bf681d087ffeabbffd346 /arch/avr32/mach-at32ap/pio.c | |
parent | 8ce0a7df6e6117d8814e976d4b7ce6a6b2c9cf93 (diff) | |
parent | 17e0e27020d028a790d97699aff85a43af5be472 (diff) |
Merge branch 'master' into 85xx
Diffstat (limited to 'arch/avr32/mach-at32ap/pio.c')
-rw-r--r-- | arch/avr32/mach-at32ap/pio.c | 255 |
1 files changed, 239 insertions, 16 deletions
diff --git a/arch/avr32/mach-at32ap/pio.c b/arch/avr32/mach-at32ap/pio.c index f1280ed8ed6..9ba5654cde1 100644 --- a/arch/avr32/mach-at32ap/pio.c +++ b/arch/avr32/mach-at32ap/pio.c @@ -12,7 +12,9 @@ #include <linux/debugfs.h> #include <linux/fs.h> #include <linux/platform_device.h> +#include <linux/irq.h> +#include <asm/gpio.h> #include <asm/io.h> #include <asm/arch/portmux.h> @@ -26,7 +28,8 @@ struct pio_device { const struct platform_device *pdev; struct clk *clk; u32 pinmux_mask; - char name[32]; + u32 gpio_mask; + char name[8]; }; static struct pio_device pio_dev[MAX_NR_PIO_DEVICES]; @@ -76,6 +79,9 @@ void __init at32_select_periph(unsigned int pin, unsigned int periph, if (!(flags & AT32_GPIOF_PULLUP)) pio_writel(pio, PUDR, mask); + /* gpio_request NOT allowed */ + set_bit(pin_index, &pio->gpio_mask); + return; fail: @@ -99,19 +105,52 @@ void __init at32_select_gpio(unsigned int pin, unsigned long flags) goto fail; } - pio_writel(pio, PUER, mask); - if (flags & AT32_GPIOF_HIGH) - pio_writel(pio, SODR, mask); - else - pio_writel(pio, CODR, mask); - if (flags & AT32_GPIOF_OUTPUT) + if (flags & AT32_GPIOF_OUTPUT) { + if (flags & AT32_GPIOF_HIGH) + pio_writel(pio, SODR, mask); + else + pio_writel(pio, CODR, mask); + pio_writel(pio, PUDR, mask); pio_writel(pio, OER, mask); - else + } else { + if (flags & AT32_GPIOF_PULLUP) + pio_writel(pio, PUER, mask); + else + pio_writel(pio, PUDR, mask); + if (flags & AT32_GPIOF_DEGLITCH) + pio_writel(pio, IFER, mask); + else + pio_writel(pio, IFDR, mask); pio_writel(pio, ODR, mask); + } pio_writel(pio, PER, mask); - if (!(flags & AT32_GPIOF_PULLUP)) - pio_writel(pio, PUDR, mask); + + /* gpio_request now allowed */ + clear_bit(pin_index, &pio->gpio_mask); + + return; + +fail: + dump_stack(); +} + +/* Reserve a pin, preventing anyone else from changing its configuration. */ +void __init at32_reserve_pin(unsigned int pin) +{ + struct pio_device *pio; + unsigned int pin_index = pin & 0x1f; + + pio = gpio_to_pio(pin); + if (unlikely(!pio)) { + printk("pio: invalid pin %u\n", pin); + goto fail; + } + + if (unlikely(test_and_set_bit(pin_index, &pio->pinmux_mask))) { + printk("%s: pin %u is busy\n", pio->name, pin_index); + goto fail; + } return; @@ -119,20 +158,197 @@ fail: dump_stack(); } +/*--------------------------------------------------------------------------*/ + +/* GPIO API */ + +int gpio_request(unsigned int gpio, const char *label) +{ + struct pio_device *pio; + unsigned int pin; + + pio = gpio_to_pio(gpio); + if (!pio) + return -ENODEV; + + pin = gpio & 0x1f; + if (test_and_set_bit(pin, &pio->gpio_mask)) + return -EBUSY; + + return 0; +} +EXPORT_SYMBOL(gpio_request); + +void gpio_free(unsigned int gpio) +{ + struct pio_device *pio; + unsigned int pin; + + pio = gpio_to_pio(gpio); + if (!pio) { + printk(KERN_ERR + "gpio: attempted to free invalid pin %u\n", gpio); + return; + } + + pin = gpio & 0x1f; + if (!test_and_clear_bit(pin, &pio->gpio_mask)) + printk(KERN_ERR "gpio: freeing free or non-gpio pin %s-%u\n", + pio->name, pin); +} +EXPORT_SYMBOL(gpio_free); + +int gpio_direction_input(unsigned int gpio) +{ + struct pio_device *pio; + unsigned int pin; + + pio = gpio_to_pio(gpio); + if (!pio) + return -ENODEV; + + pin = gpio & 0x1f; + pio_writel(pio, ODR, 1 << pin); + + return 0; +} +EXPORT_SYMBOL(gpio_direction_input); + +int gpio_direction_output(unsigned int gpio) +{ + struct pio_device *pio; + unsigned int pin; + + pio = gpio_to_pio(gpio); + if (!pio) + return -ENODEV; + + pin = gpio & 0x1f; + pio_writel(pio, OER, 1 << pin); + + return 0; +} +EXPORT_SYMBOL(gpio_direction_output); + +int gpio_get_value(unsigned int gpio) +{ + struct pio_device *pio = &pio_dev[gpio >> 5]; + + return (pio_readl(pio, PDSR) >> (gpio & 0x1f)) & 1; +} +EXPORT_SYMBOL(gpio_get_value); + +void gpio_set_value(unsigned int gpio, int value) +{ + struct pio_device *pio = &pio_dev[gpio >> 5]; + u32 mask; + + mask = 1 << (gpio & 0x1f); + if (value) + pio_writel(pio, SODR, mask); + else + pio_writel(pio, CODR, mask); +} +EXPORT_SYMBOL(gpio_set_value); + +/*--------------------------------------------------------------------------*/ + +/* GPIO IRQ support */ + +static void gpio_irq_mask(unsigned irq) +{ + unsigned gpio = irq_to_gpio(irq); + struct pio_device *pio = &pio_dev[gpio >> 5]; + + pio_writel(pio, IDR, 1 << (gpio & 0x1f)); +} + +static void gpio_irq_unmask(unsigned irq) +{ + unsigned gpio = irq_to_gpio(irq); + struct pio_device *pio = &pio_dev[gpio >> 5]; + + pio_writel(pio, IER, 1 << (gpio & 0x1f)); +} + +static int gpio_irq_type(unsigned irq, unsigned type) +{ + if (type != IRQ_TYPE_EDGE_BOTH && type != IRQ_TYPE_NONE) + return -EINVAL; + + return 0; +} + +static struct irq_chip gpio_irqchip = { + .name = "gpio", + .mask = gpio_irq_mask, + .unmask = gpio_irq_unmask, + .set_type = gpio_irq_type, +}; + +static void gpio_irq_handler(unsigned irq, struct irq_desc *desc) +{ + struct pio_device *pio = get_irq_chip_data(irq); + unsigned gpio_irq; + + gpio_irq = (unsigned) get_irq_data(irq); + for (;;) { + u32 isr; + struct irq_desc *d; + + /* ack pending GPIO interrupts */ + isr = pio_readl(pio, ISR) & pio_readl(pio, IMR); + if (!isr) + break; + do { + int i; + + i = ffs(isr) - 1; + isr &= ~(1 << i); + + i += gpio_irq; + d = &irq_desc[i]; + + d->handle_irq(i, d); + } while (isr); + } +} + +static void __init +gpio_irq_setup(struct pio_device *pio, int irq, int gpio_irq) +{ + unsigned i; + + set_irq_chip_data(irq, pio); + set_irq_data(irq, (void *) gpio_irq); + + for (i = 0; i < 32; i++, gpio_irq++) { + set_irq_chip_data(gpio_irq, pio); + set_irq_chip_and_handler(gpio_irq, &gpio_irqchip, + handle_simple_irq); + } + + set_irq_chained_handler(irq, gpio_irq_handler); +} + +/*--------------------------------------------------------------------------*/ + static int __init pio_probe(struct platform_device *pdev) { struct pio_device *pio = NULL; + int irq = platform_get_irq(pdev, 0); + int gpio_irq_base = GPIO_IRQ_BASE + pdev->id * 32; BUG_ON(pdev->id >= MAX_NR_PIO_DEVICES); pio = &pio_dev[pdev->id]; BUG_ON(!pio->regs); - /* TODO: Interrupts */ + gpio_irq_setup(pio, irq, gpio_irq_base); platform_set_drvdata(pdev, pio); - printk(KERN_INFO "%s: Atmel Port Multiplexer at 0x%p (irq %d)\n", - pio->name, pio->regs, platform_get_irq(pdev, 0)); + printk(KERN_DEBUG "%s: base 0x%p, irq %d chains %d..%d\n", + pio->name, pio->regs, irq, gpio_irq_base, gpio_irq_base + 31); return 0; } @@ -148,7 +364,7 @@ static int __init pio_init(void) { return platform_driver_register(&pio_driver); } -subsys_initcall(pio_init); +postcore_initcall(pio_init); void __init at32_init_pio(struct platform_device *pdev) { @@ -184,6 +400,13 @@ void __init at32_init_pio(struct platform_device *pdev) pio->pdev = pdev; pio->regs = ioremap(regs->start, regs->end - regs->start + 1); - pio_writel(pio, ODR, ~0UL); - pio_writel(pio, PER, ~0UL); + /* + * request_gpio() is only valid for pins that have been + * explicitly configured as GPIO and not previously requested + */ + pio->gpio_mask = ~0UL; + + /* start with irqs disabled and acked */ + pio_writel(pio, IDR, ~0UL); + (void) pio_readl(pio, ISR); } |