/* * Copyright (C) 2003 Ralf Baechle * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * * Handler for RM9000 extended interrupts. These are a non-standard * feature so we handle them separately from standard interrupts. */ #include <linux/init.h> #include <linux/interrupt.h> #include <linux/kernel.h> #include <linux/module.h> #include <asm/irq_cpu.h> #include <asm/mipsregs.h> #include <asm/system.h> static inline void unmask_rm9k_irq(unsigned int irq) { set_c0_intcontrol(0x1000 << (irq - RM9K_CPU_IRQ_BASE)); } static inline void mask_rm9k_irq(unsigned int irq) { clear_c0_intcontrol(0x1000 << (irq - RM9K_CPU_IRQ_BASE)); } static inline void rm9k_cpu_irq_enable(unsigned int irq) { unsigned long flags; local_irq_save(flags); unmask_rm9k_irq(irq); local_irq_restore(flags); } /* * Performance counter interrupts are global on all processors. */ static void local_rm9k_perfcounter_irq_startup(void *args) { unsigned int irq = (unsigned int) args; rm9k_cpu_irq_enable(irq); } static unsigned int rm9k_perfcounter_irq_startup(unsigned int irq) { on_each_cpu(local_rm9k_perfcounter_irq_startup, (void *) irq, 1); return 0; } static void local_rm9k_perfcounter_irq_shutdown(void *args) { unsigned int irq = (unsigned int) args; unsigned long flags; local_irq_save(flags); mask_rm9k_irq(irq); local_irq_restore(flags); } static void rm9k_perfcounter_irq_shutdown(unsigned int irq) { on_each_cpu(local_rm9k_perfcounter_irq_shutdown, (void *) irq, 1); } static struct irq_chip rm9k_irq_controller = { .name = "RM9000", .ack = mask_rm9k_irq, .mask = mask_rm9k_irq, .mask_ack = mask_rm9k_irq, .unmask = unmask_rm9k_irq, .eoi = unmask_rm9k_irq }; static struct irq_chip rm9k_perfcounter_irq = { .name = "RM9000", .startup = rm9k_perfcounter_irq_startup, .shutdown = rm9k_perfcounter_irq_shutdown, .ack = mask_rm9k_irq, .mask = mask_rm9k_irq, .mask_ack = mask_rm9k_irq, .unmask = unmask_rm9k_irq, }; unsigned int rm9000_perfcount_irq; EXPORT_SYMBOL(rm9000_perfcount_irq); void __init rm9k_cpu_irq_init(void) { int base = RM9K_CPU_IRQ_BASE; int i; clear_c0_intcontrol(0x0000f000); /* Mask all */ for (i = base; i < base + 4; i++) set_irq_chip_and_handler(i, &rm9k_irq_controller, handle_level_irq); rm9000_perfcount_irq = base + 1; set_irq_chip_and_handler(rm9000_perfcount_irq, &rm9k_perfcounter_irq, handle_percpu_irq); }