diff options
Diffstat (limited to 'target/linux/lantiq/files/arch/mips')
| -rw-r--r-- | target/linux/lantiq/files/arch/mips/lantiq/irq.c | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/target/linux/lantiq/files/arch/mips/lantiq/irq.c b/target/linux/lantiq/files/arch/mips/lantiq/irq.c new file mode 100644 index 0000000000..d410b3238a --- /dev/null +++ b/target/linux/lantiq/files/arch/mips/lantiq/irq.c @@ -0,0 +1,213 @@ +/* + * 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. + * + * Copyright (C) 2010 John Crispin <blogic@openwrt.org> + */ + +#include <linux/module.h> +#include <linux/interrupt.h> + +#include <asm/bootinfo.h> +#include <asm/irq_cpu.h> + +#include <lantiq.h> +#include <irq.h> + +#define LQ_ICU_BASE_ADDR (KSEG1 | 0x1F880200) + +#define LQ_ICU_IM0_ISR ((u32 *)(LQ_ICU_BASE_ADDR + 0x0000)) +#define LQ_ICU_IM0_IER ((u32 *)(LQ_ICU_BASE_ADDR + 0x0008)) +#define LQ_ICU_IM0_IOSR ((u32 *)(LQ_ICU_BASE_ADDR + 0x0010)) +#define LQ_ICU_IM0_IRSR ((u32 *)(LQ_ICU_BASE_ADDR + 0x0018)) +#define LQ_ICU_IM0_IMR ((u32 *)(LQ_ICU_BASE_ADDR + 0x0020)) + +#define LQ_ICU_IM1_ISR ((u32 *)(LQ_ICU_BASE_ADDR + 0x0028)) +#define LQ_ICU_IM2_ISR ((u32 *)(LQ_ICU_BASE_ADDR + 0x0050)) +#define LQ_ICU_IM3_ISR ((u32 *)(LQ_ICU_BASE_ADDR + 0x0078)) +#define LQ_ICU_IM4_ISR ((u32 *)(LQ_ICU_BASE_ADDR + 0x00A0)) + +#define LQ_ICU_OFFSET (LQ_ICU_IM1_ISR - LQ_ICU_IM0_ISR) + +void +lq_disable_irq(unsigned int irq_nr) +{ + u32 *ier = LQ_ICU_IM0_IER; + irq_nr -= INT_NUM_IRQ0; + ier += LQ_ICU_OFFSET * (irq_nr / INT_NUM_IM_OFFSET); + irq_nr %= INT_NUM_IM_OFFSET; + lq_w32(lq_r32(ier) & ~(1 << irq_nr), ier); +} +EXPORT_SYMBOL(lq_disable_irq); + +void +lq_mask_and_ack_irq(unsigned int irq_nr) +{ + u32 *ier = LQ_ICU_IM0_IER; + u32 *isr = LQ_ICU_IM0_ISR; + irq_nr -= INT_NUM_IRQ0; + ier += LQ_ICU_OFFSET * (irq_nr / INT_NUM_IM_OFFSET); + isr += LQ_ICU_OFFSET * (irq_nr / INT_NUM_IM_OFFSET); + irq_nr %= INT_NUM_IM_OFFSET; + lq_w32(lq_r32(ier) & ~(1 << irq_nr), ier); + lq_w32((1 << irq_nr), isr); +} +EXPORT_SYMBOL(lq_mask_and_ack_irq); + +static void +lq_ack_irq(unsigned int irq_nr) +{ + u32 *isr = LQ_ICU_IM0_ISR; + irq_nr -= INT_NUM_IRQ0; + isr += LQ_ICU_OFFSET * (irq_nr / INT_NUM_IM_OFFSET); + irq_nr %= INT_NUM_IM_OFFSET; + lq_w32((1 << irq_nr), isr); +} + +void +lq_enable_irq(unsigned int irq_nr) +{ + u32 *ier = LQ_ICU_IM0_IER; + irq_nr -= INT_NUM_IRQ0; + ier += LQ_ICU_OFFSET * (irq_nr / INT_NUM_IM_OFFSET); + irq_nr %= INT_NUM_IM_OFFSET; + lq_w32(lq_r32(ier) | (1 << irq_nr), ier); +} +EXPORT_SYMBOL(lq_enable_irq); + +static unsigned int +lq_startup_irq(unsigned int irq) +{ + lq_enable_irq(irq); + return 0; +} + +static void +lq_end_irq(unsigned int irq) +{ + if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS))) + lq_enable_irq(irq); +} + +static struct irq_chip +lq_irq_type = { + "lq_irq", + .startup = lq_startup_irq, + .enable = lq_enable_irq, + .disable = lq_disable_irq, + .unmask = lq_enable_irq, + .ack = lq_ack_irq, + .mask = lq_disable_irq, + .mask_ack = lq_mask_and_ack_irq, + .end = lq_end_irq, +}; + +static void +lq_hw_irqdispatch(int module) +{ + u32 irq; + + irq = lq_r32(LQ_ICU_IM0_IOSR + (module * LQ_ICU_OFFSET)); + if (irq == 0) + return; + + /* silicon bug causes only the msb set to 1 to be valid. all + other bits might be bogus */ + irq = __fls(irq); + do_IRQ((int)irq + INT_NUM_IM0_IRL0 + (INT_NUM_IM_OFFSET * module)); +} + +#define DEFINE_HWx_IRQDISPATCH(x) \ +static void lq_hw ## x ## _irqdispatch(void)\ +{\ + lq_hw_irqdispatch(x); \ +} +static void lq_hw5_irqdispatch(void) +{ + do_IRQ(MIPS_CPU_TIMER_IRQ); +} +DEFINE_HWx_IRQDISPATCH(0) +DEFINE_HWx_IRQDISPATCH(1) +DEFINE_HWx_IRQDISPATCH(2) +DEFINE_HWx_IRQDISPATCH(3) +DEFINE_HWx_IRQDISPATCH(4) +/*DEFINE_HWx_IRQDISPATCH(5)*/ + +asmlinkage void +plat_irq_dispatch(void) +{ + unsigned int pending = read_c0_status() & read_c0_cause() & ST0_IM; + unsigned int i; + + if (pending & CAUSEF_IP7) + { + do_IRQ(MIPS_CPU_TIMER_IRQ); + goto out; + } else { + for (i = 0; i < 5; i++) + { + if (pending & (CAUSEF_IP2 << i)) + { + lq_hw_irqdispatch(i); + goto out; + } + } + } + printk(KERN_ALERT "Spurious IRQ: CAUSE=0x%08x\n", read_c0_status()); + +out: + return; +} + +static struct irqaction +cascade = { + .handler = no_action, + .flags = IRQF_DISABLED, + .name = "cascade", +}; + +void __init +arch_init_irq(void) +{ + int i; + + for (i = 0; i < 5; i++) + lq_w32(0, LQ_ICU_IM0_IER + (i * LQ_ICU_OFFSET)); + + mips_cpu_irq_init(); + + for (i = 2; i <= 6; i++) + setup_irq(i, &cascade); + + if (cpu_has_vint) { + printk(KERN_INFO "Setting up vectored interrupts\n"); + set_vi_handler(2, lq_hw0_irqdispatch); + set_vi_handler(3, lq_hw1_irqdispatch); + set_vi_handler(4, lq_hw2_irqdispatch); + set_vi_handler(5, lq_hw3_irqdispatch); + set_vi_handler(6, lq_hw4_irqdispatch); + set_vi_handler(7, lq_hw5_irqdispatch); + } + + for (i = INT_NUM_IRQ0; i <= (INT_NUM_IRQ0 + (5 * INT_NUM_IM_OFFSET)); i++) + set_irq_chip_and_handler(i, &lq_irq_type, + handle_level_irq); + + #if !defined(CONFIG_MIPS_MT_SMP) && !defined(CONFIG_MIPS_MT_SMTC) + set_c0_status(IE_IRQ0 | IE_IRQ1 | IE_IRQ2 | + IE_IRQ3 | IE_IRQ4 | IE_IRQ5); + #else + set_c0_status(IE_SW0 | IE_SW1 | IE_IRQ0 | IE_IRQ1 | + IE_IRQ2 | IE_IRQ3 | IE_IRQ4 | IE_IRQ5); + #endif +} + +void __cpuinit +arch_fixup_c0_irqs(void) +{ + /* FIXME: check for CPUID and only do fix for specific chips/versions */ + cp0_compare_irq = CP0_LEGACY_COMPARE_IRQ; + cp0_perfcount_irq = CP0_LEGACY_PERFCNT_IRQ; +} + |