diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/arm/mach-sa1100/irq.c | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2 |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'arch/arm/mach-sa1100/irq.c')
-rw-r--r-- | arch/arm/mach-sa1100/irq.c | 332 |
1 files changed, 332 insertions, 0 deletions
diff --git a/arch/arm/mach-sa1100/irq.c b/arch/arm/mach-sa1100/irq.c new file mode 100644 index 000000000000..66a929cb7bc5 --- /dev/null +++ b/arch/arm/mach-sa1100/irq.c @@ -0,0 +1,332 @@ +/* + * linux/arch/arm/mach-sa1100/irq.c + * + * Copyright (C) 1999-2001 Nicolas Pitre + * + * Generic IRQ handling for the SA11x0, GPIO 11-27 IRQ demultiplexing. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include <linux/init.h> +#include <linux/module.h> +#include <linux/ioport.h> +#include <linux/ptrace.h> +#include <linux/sysdev.h> + +#include <asm/hardware.h> +#include <asm/irq.h> +#include <asm/mach/irq.h> + +#include "generic.h" + + +/* + * SA1100 GPIO edge detection for IRQs: + * IRQs are generated on Falling-Edge, Rising-Edge, or both. + * Use this instead of directly setting GRER/GFER. + */ +static int GPIO_IRQ_rising_edge; +static int GPIO_IRQ_falling_edge; +static int GPIO_IRQ_mask = (1 << 11) - 1; + +/* + * To get the GPIO number from an IRQ number + */ +#define GPIO_11_27_IRQ(i) ((i) - 21) +#define GPIO11_27_MASK(irq) (1 << GPIO_11_27_IRQ(irq)) + +static int sa1100_gpio_type(unsigned int irq, unsigned int type) +{ + unsigned int mask; + + if (irq <= 10) + mask = 1 << irq; + else + mask = GPIO11_27_MASK(irq); + + if (type == IRQT_PROBE) { + if ((GPIO_IRQ_rising_edge | GPIO_IRQ_falling_edge) & mask) + return 0; + type = __IRQT_RISEDGE | __IRQT_FALEDGE; + } + + if (type & __IRQT_RISEDGE) { + GPIO_IRQ_rising_edge |= mask; + } else + GPIO_IRQ_rising_edge &= ~mask; + if (type & __IRQT_FALEDGE) { + GPIO_IRQ_falling_edge |= mask; + } else + GPIO_IRQ_falling_edge &= ~mask; + + GRER = GPIO_IRQ_rising_edge & GPIO_IRQ_mask; + GFER = GPIO_IRQ_falling_edge & GPIO_IRQ_mask; + + return 0; +} + +/* + * GPIO IRQs must be acknowledged. This is for IRQs from 0 to 10. + */ +static void sa1100_low_gpio_ack(unsigned int irq) +{ + GEDR = (1 << irq); +} + +static void sa1100_low_gpio_mask(unsigned int irq) +{ + ICMR &= ~(1 << irq); +} + +static void sa1100_low_gpio_unmask(unsigned int irq) +{ + ICMR |= 1 << irq; +} + +static int sa1100_low_gpio_wake(unsigned int irq, unsigned int on) +{ + if (on) + PWER |= 1 << irq; + else + PWER &= ~(1 << irq); + return 0; +} + +static struct irqchip sa1100_low_gpio_chip = { + .ack = sa1100_low_gpio_ack, + .mask = sa1100_low_gpio_mask, + .unmask = sa1100_low_gpio_unmask, + .type = sa1100_gpio_type, + .wake = sa1100_low_gpio_wake, +}; + +/* + * IRQ11 (GPIO11 through 27) handler. We enter here with the + * irq_controller_lock held, and IRQs disabled. Decode the IRQ + * and call the handler. + */ +static void +sa1100_high_gpio_handler(unsigned int irq, struct irqdesc *desc, + struct pt_regs *regs) +{ + unsigned int mask; + + mask = GEDR & 0xfffff800; + do { + /* + * clear down all currently active IRQ sources. + * We will be processing them all. + */ + GEDR = mask; + + irq = IRQ_GPIO11; + desc = irq_desc + irq; + mask >>= 11; + do { + if (mask & 1) + desc->handle(irq, desc, regs); + mask >>= 1; + irq++; + desc++; + } while (mask); + + mask = GEDR & 0xfffff800; + } while (mask); +} + +/* + * Like GPIO0 to 10, GPIO11-27 IRQs need to be handled specially. + * In addition, the IRQs are all collected up into one bit in the + * interrupt controller registers. + */ +static void sa1100_high_gpio_ack(unsigned int irq) +{ + unsigned int mask = GPIO11_27_MASK(irq); + + GEDR = mask; +} + +static void sa1100_high_gpio_mask(unsigned int irq) +{ + unsigned int mask = GPIO11_27_MASK(irq); + + GPIO_IRQ_mask &= ~mask; + + GRER &= ~mask; + GFER &= ~mask; +} + +static void sa1100_high_gpio_unmask(unsigned int irq) +{ + unsigned int mask = GPIO11_27_MASK(irq); + + GPIO_IRQ_mask |= mask; + + GRER = GPIO_IRQ_rising_edge & GPIO_IRQ_mask; + GFER = GPIO_IRQ_falling_edge & GPIO_IRQ_mask; +} + +static int sa1100_high_gpio_wake(unsigned int irq, unsigned int on) +{ + if (on) + PWER |= GPIO11_27_MASK(irq); + else + PWER &= ~GPIO11_27_MASK(irq); + return 0; +} + +static struct irqchip sa1100_high_gpio_chip = { + .ack = sa1100_high_gpio_ack, + .mask = sa1100_high_gpio_mask, + .unmask = sa1100_high_gpio_unmask, + .type = sa1100_gpio_type, + .wake = sa1100_high_gpio_wake, +}; + +/* + * We don't need to ACK IRQs on the SA1100 unless they're GPIOs + * this is for internal IRQs i.e. from 11 to 31. + */ +static void sa1100_mask_irq(unsigned int irq) +{ + ICMR &= ~(1 << irq); +} + +static void sa1100_unmask_irq(unsigned int irq) +{ + ICMR |= (1 << irq); +} + +static struct irqchip sa1100_normal_chip = { + .ack = sa1100_mask_irq, + .mask = sa1100_mask_irq, + .unmask = sa1100_unmask_irq, +}; + +static struct resource irq_resource = { + .name = "irqs", + .start = 0x90050000, + .end = 0x9005ffff, +}; + +static struct sa1100irq_state { + unsigned int saved; + unsigned int icmr; + unsigned int iclr; + unsigned int iccr; +} sa1100irq_state; + +static int sa1100irq_suspend(struct sys_device *dev, pm_message_t state) +{ + struct sa1100irq_state *st = &sa1100irq_state; + + st->saved = 1; + st->icmr = ICMR; + st->iclr = ICLR; + st->iccr = ICCR; + + /* + * Disable all GPIO-based interrupts. + */ + ICMR &= ~(IC_GPIO11_27|IC_GPIO10|IC_GPIO9|IC_GPIO8|IC_GPIO7| + IC_GPIO6|IC_GPIO5|IC_GPIO4|IC_GPIO3|IC_GPIO2| + IC_GPIO1|IC_GPIO0); + + /* + * Set the appropriate edges for wakeup. + */ + GRER = PWER & GPIO_IRQ_rising_edge; + GFER = PWER & GPIO_IRQ_falling_edge; + + /* + * Clear any pending GPIO interrupts. + */ + GEDR = GEDR; + + return 0; +} + +static int sa1100irq_resume(struct sys_device *dev) +{ + struct sa1100irq_state *st = &sa1100irq_state; + + if (st->saved) { + ICCR = st->iccr; + ICLR = st->iclr; + + GRER = GPIO_IRQ_rising_edge & GPIO_IRQ_mask; + GFER = GPIO_IRQ_falling_edge & GPIO_IRQ_mask; + + ICMR = st->icmr; + } + return 0; +} + +static struct sysdev_class sa1100irq_sysclass = { + set_kset_name("sa11x0-irq"), + .suspend = sa1100irq_suspend, + .resume = sa1100irq_resume, +}; + +static struct sys_device sa1100irq_device = { + .id = 0, + .cls = &sa1100irq_sysclass, +}; + +static int __init sa1100irq_init_devicefs(void) +{ + sysdev_class_register(&sa1100irq_sysclass); + return sysdev_register(&sa1100irq_device); +} + +device_initcall(sa1100irq_init_devicefs); + +void __init sa1100_init_irq(void) +{ + unsigned int irq; + + request_resource(&iomem_resource, &irq_resource); + + /* disable all IRQs */ + ICMR = 0; + + /* all IRQs are IRQ, not FIQ */ + ICLR = 0; + + /* clear all GPIO edge detects */ + GFER = 0; + GRER = 0; + GEDR = -1; + + /* + * Whatever the doc says, this has to be set for the wait-on-irq + * instruction to work... on a SA1100 rev 9 at least. + */ + ICCR = 1; + + for (irq = 0; irq <= 10; irq++) { + set_irq_chip(irq, &sa1100_low_gpio_chip); + set_irq_handler(irq, do_edge_IRQ); + set_irq_flags(irq, IRQF_VALID | IRQF_PROBE); + } + + for (irq = 12; irq <= 31; irq++) { + set_irq_chip(irq, &sa1100_normal_chip); + set_irq_handler(irq, do_level_IRQ); + set_irq_flags(irq, IRQF_VALID); + } + + for (irq = 32; irq <= 48; irq++) { + set_irq_chip(irq, &sa1100_high_gpio_chip); + set_irq_handler(irq, do_edge_IRQ); + set_irq_flags(irq, IRQF_VALID | IRQF_PROBE); + } + + /* + * Install handler for GPIO 11-27 edge detect interrupts + */ + set_irq_chip(IRQ_GPIO11_27, &sa1100_normal_chip); + set_irq_chained_handler(IRQ_GPIO11_27, sa1100_high_gpio_handler); +} |