diff options
Diffstat (limited to 'arch/arm/mach-sa1100/irq.c')
| -rw-r--r-- | arch/arm/mach-sa1100/irq.c | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/arch/arm/mach-sa1100/irq.c b/arch/arm/mach-sa1100/irq.c new file mode 100644 index 000000000..65aebfa66 --- /dev/null +++ b/arch/arm/mach-sa1100/irq.c @@ -0,0 +1,178 @@ +/* + * 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/interrupt.h> +#include <linux/io.h> +#include <linux/irq.h> +#include <linux/irqdomain.h> +#include <linux/ioport.h> +#include <linux/syscore_ops.h> + +#include <mach/hardware.h> +#include <mach/irqs.h> +#include <asm/mach/irq.h> +#include <asm/exception.h> + +#include "generic.h" + + +/* + * We don't need to ACK IRQs on the SA1100 unless they're GPIOs + * this is for internal IRQs i.e. from IRQ LCD to RTCAlrm. + */ +static void sa1100_mask_irq(struct irq_data *d) +{ + ICMR &= ~BIT(d->hwirq); +} + +static void sa1100_unmask_irq(struct irq_data *d) +{ + ICMR |= BIT(d->hwirq); +} + +/* + * Apart form GPIOs, only the RTC alarm can be a wakeup event. + */ +static int sa1100_set_wake(struct irq_data *d, unsigned int on) +{ + if (BIT(d->hwirq) == IC_RTCAlrm) { + if (on) + PWER |= PWER_RTC; + else + PWER &= ~PWER_RTC; + return 0; + } + return -EINVAL; +} + +static struct irq_chip sa1100_normal_chip = { + .name = "SC", + .irq_ack = sa1100_mask_irq, + .irq_mask = sa1100_mask_irq, + .irq_unmask = sa1100_unmask_irq, + .irq_set_wake = sa1100_set_wake, +}; + +static int sa1100_normal_irqdomain_map(struct irq_domain *d, + unsigned int irq, irq_hw_number_t hwirq) +{ + irq_set_chip_and_handler(irq, &sa1100_normal_chip, + handle_level_irq); + set_irq_flags(irq, IRQF_VALID); + + return 0; +} + +static struct irq_domain_ops sa1100_normal_irqdomain_ops = { + .map = sa1100_normal_irqdomain_map, + .xlate = irq_domain_xlate_onetwocell, +}; + +static struct irq_domain *sa1100_normal_irqdomain; + +static struct resource irq_resource = + DEFINE_RES_MEM_NAMED(0x90050000, SZ_64K, "irqs"); + +static struct sa1100irq_state { + unsigned int saved; + unsigned int icmr; + unsigned int iclr; + unsigned int iccr; +} sa1100irq_state; + +static int sa1100irq_suspend(void) +{ + 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); + + return 0; +} + +static void sa1100irq_resume(void) +{ + struct sa1100irq_state *st = &sa1100irq_state; + + if (st->saved) { + ICCR = st->iccr; + ICLR = st->iclr; + + ICMR = st->icmr; + } +} + +static struct syscore_ops sa1100irq_syscore_ops = { + .suspend = sa1100irq_suspend, + .resume = sa1100irq_resume, +}; + +static int __init sa1100irq_init_devicefs(void) +{ + register_syscore_ops(&sa1100irq_syscore_ops); + return 0; +} + +device_initcall(sa1100irq_init_devicefs); + +static asmlinkage void __exception_irq_entry +sa1100_handle_irq(struct pt_regs *regs) +{ + uint32_t icip, icmr, mask; + + do { + icip = (ICIP); + icmr = (ICMR); + mask = icip & icmr; + + if (mask == 0) + break; + + handle_domain_irq(sa1100_normal_irqdomain, + ffs(mask) - 1, regs); + } while (1); +} + +void __init sa1100_init_irq(void) +{ + request_resource(&iomem_resource, &irq_resource); + + /* disable all IRQs */ + ICMR = 0; + + /* all IRQs are IRQ, not FIQ */ + ICLR = 0; + + /* + * 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; + + sa1100_normal_irqdomain = irq_domain_add_simple(NULL, + 32, IRQ_GPIO0_SC, + &sa1100_normal_irqdomain_ops, NULL); + + set_handle_irq(sa1100_handle_irq); + + sa1100_init_gpio(); +} |