From 6a4e5227a33f60f918b30cf2001fb0bb259d9396 Mon Sep 17 00:00:00 2001 From: Haavard Skinnemoen Date: Mon, 5 Feb 2007 16:57:13 +0100 Subject: [PATCH] [AVR32] GPIO API implementation Arch-neutral GPIO calls for AVR32. GPIO IRQ support written by David Brownell. Signed-off-by: Haavard Skinnemoen --- arch/avr32/mach-at32ap/Makefile | 2 +- arch/avr32/mach-at32ap/at32ap7000.c | 2 +- arch/avr32/mach-at32ap/pio.c | 233 ++++++++++++++++++++++-- include/asm-avr32/arch-at32ap/gpio.h | 27 +++ include/asm-avr32/arch-at32ap/irq.h | 14 ++ include/asm-avr32/arch-at32ap/portmux.h | 7 +- include/asm-avr32/gpio.h | 6 + include/asm-avr32/irq.h | 8 +- 8 files changed, 278 insertions(+), 21 deletions(-) create mode 100644 include/asm-avr32/arch-at32ap/gpio.h create mode 100644 include/asm-avr32/arch-at32ap/irq.h create mode 100644 include/asm-avr32/gpio.h diff --git a/arch/avr32/mach-at32ap/Makefile b/arch/avr32/mach-at32ap/Makefile index f62eb691551..b21bea9af8b 100644 --- a/arch/avr32/mach-at32ap/Makefile +++ b/arch/avr32/mach-at32ap/Makefile @@ -1,2 +1,2 @@ -obj-y += at32ap.o clock.o pio.o intc.o extint.o hsmc.o +obj-y += at32ap.o clock.o intc.o extint.o pio.o hsmc.o obj-$(CONFIG_CPU_AT32AP7000) += at32ap7000.o diff --git a/arch/avr32/mach-at32ap/at32ap7000.c b/arch/avr32/mach-at32ap/at32ap7000.c index 175853a3c32..21561ab6047 100644 --- a/arch/avr32/mach-at32ap/at32ap7000.c +++ b/arch/avr32/mach-at32ap/at32ap7000.c @@ -498,7 +498,7 @@ DEV_CLK(mck, pio3, pba, 13); void __init at32_add_system_devices(void) { - system_manager.eim_first_irq = NR_INTERNAL_IRQS; + system_manager.eim_first_irq = EIM_IRQ_BASE; platform_device_register(&at32_sm_device); platform_device_register(&at32_intc0_device); diff --git a/arch/avr32/mach-at32ap/pio.c b/arch/avr32/mach-at32ap/pio.c index f1280ed8ed6..17e835de95c 100644 --- a/arch/avr32/mach-at32ap/pio.c +++ b/arch/avr32/mach-at32ap/pio.c @@ -12,7 +12,9 @@ #include #include #include +#include +#include #include #include @@ -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 +105,29 @@ 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; @@ -119,20 +135,199 @@ 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 +343,7 @@ 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 +379,16 @@ void __init at32_init_pio(struct platform_device *pdev) pio->pdev = pdev; pio->regs = ioremap(regs->start, regs->end - regs->start + 1); + /* + * request_gpio() is only valid for pins that have been + * explicitly configured as GPIO and not previously requested + */ + pio->gpio_mask = ~0UL; + pio_writel(pio, ODR, ~0UL); pio_writel(pio, PER, ~0UL); + + /* start with irqs disabled and acked */ + pio_writel(pio, IDR, ~0UL); + (void) pio_readl(pio, ISR); } diff --git a/include/asm-avr32/arch-at32ap/gpio.h b/include/asm-avr32/arch-at32ap/gpio.h new file mode 100644 index 00000000000..fcb756bdaa8 --- /dev/null +++ b/include/asm-avr32/arch-at32ap/gpio.h @@ -0,0 +1,27 @@ +#ifndef __ASM_AVR32_ARCH_GPIO_H +#define __ASM_AVR32_ARCH_GPIO_H + +#include +#include + + +/* Arch-neutral GPIO API */ +int __must_check gpio_request(unsigned int gpio, const char *label); +void gpio_free(unsigned int gpio); + +int gpio_direction_input(unsigned int gpio); +int gpio_direction_output(unsigned int gpio); +int gpio_get_value(unsigned int gpio); +void gpio_set_value(unsigned int gpio, int value); + +static inline int gpio_to_irq(unsigned int gpio) +{ + return gpio + GPIO_IRQ_BASE; +} + +static inline int irq_to_gpio(unsigned int irq) +{ + return irq - GPIO_IRQ_BASE; +} + +#endif /* __ASM_AVR32_ARCH_GPIO_H */ diff --git a/include/asm-avr32/arch-at32ap/irq.h b/include/asm-avr32/arch-at32ap/irq.h new file mode 100644 index 00000000000..f8f7f4571e4 --- /dev/null +++ b/include/asm-avr32/arch-at32ap/irq.h @@ -0,0 +1,14 @@ +#ifndef __ASM_AVR32_ARCH_IRQ_H +#define __ASM_AVR32_ARCH_IRQ_H + +#define EIM_IRQ_BASE NR_INTERNAL_IRQS +#define NR_EIM_IRQS 32 + +#define AT32_EXTINT(n) (EIM_IRQ_BASE + (n)) + +#define GPIO_IRQ_BASE (EIM_IRQ_BASE + NR_EIM_IRQS) +#define NR_GPIO_IRQS (4 * 32) + +#define NR_IRQS (GPIO_IRQ_BASE + NR_GPIO_IRQS) + +#endif /* __ASM_AVR32_ARCH_IRQ_H */ diff --git a/include/asm-avr32/arch-at32ap/portmux.h b/include/asm-avr32/arch-at32ap/portmux.h index 83c69057132..2ba611e0e13 100644 --- a/include/asm-avr32/arch-at32ap/portmux.h +++ b/include/asm-avr32/arch-at32ap/portmux.h @@ -15,9 +15,10 @@ * * The following flags determine the initial state of the pin. */ -#define AT32_GPIOF_PULLUP 0x00000001 /* Enable pull-up */ -#define AT32_GPIOF_OUTPUT 0x00000002 /* Enable output driver */ -#define AT32_GPIOF_HIGH 0x00000004 /* Set output high */ +#define AT32_GPIOF_PULLUP 0x00000001 /* (not-OUT) Enable pull-up */ +#define AT32_GPIOF_OUTPUT 0x00000002 /* (OUT) Enable output driver */ +#define AT32_GPIOF_HIGH 0x00000004 /* (OUT) Set output high */ +#define AT32_GPIOF_DEGLITCH 0x00000008 /* (IN) Filter glitches */ void at32_select_periph(unsigned int pin, unsigned int periph, unsigned long flags); diff --git a/include/asm-avr32/gpio.h b/include/asm-avr32/gpio.h new file mode 100644 index 00000000000..19e8ccc77db --- /dev/null +++ b/include/asm-avr32/gpio.h @@ -0,0 +1,6 @@ +#ifndef __ASM_AVR32_GPIO_H +#define __ASM_AVR32_GPIO_H + +#include + +#endif /* __ASM_AVR32_GPIO_H */ diff --git a/include/asm-avr32/irq.h b/include/asm-avr32/irq.h index f7e725707dd..83e6549d778 100644 --- a/include/asm-avr32/irq.h +++ b/include/asm-avr32/irq.h @@ -2,8 +2,12 @@ #define __ASM_AVR32_IRQ_H #define NR_INTERNAL_IRQS 64 -#define NR_EXTERNAL_IRQS 64 -#define NR_IRQS (NR_INTERNAL_IRQS + NR_EXTERNAL_IRQS) + +#include + +#ifndef NR_IRQS +#define NR_IRQS (NR_INTERNAL_IRQS) +#endif #define irq_canonicalize(i) (i) -- 2.41.1