| /* |
| * 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 int irq_base; |
| |
| static inline void unmask_rm9k_irq(unsigned int irq) |
| { |
| set_c0_intcontrol(0x1000 << (irq - irq_base)); |
| } |
| |
| static inline void mask_rm9k_irq(unsigned int irq) |
| { |
| clear_c0_intcontrol(0x1000 << (irq - 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); |
| } |
| |
| static void rm9k_cpu_irq_disable(unsigned int irq) |
| { |
| unsigned long flags; |
| |
| local_irq_save(flags); |
| mask_rm9k_irq(irq); |
| local_irq_restore(flags); |
| } |
| |
| static unsigned int rm9k_cpu_irq_startup(unsigned int irq) |
| { |
| rm9k_cpu_irq_enable(irq); |
| |
| return 0; |
| } |
| |
| #define rm9k_cpu_irq_shutdown rm9k_cpu_irq_disable |
| |
| /* |
| * 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, 0, 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, 0, 1); |
| } |
| |
| |
| /* |
| * While we ack the interrupt interrupts are disabled and thus we don't need |
| * to deal with concurrency issues. Same for rm9k_cpu_irq_end. |
| */ |
| static void rm9k_cpu_irq_ack(unsigned int irq) |
| { |
| mask_rm9k_irq(irq); |
| } |
| |
| static void rm9k_cpu_irq_end(unsigned int irq) |
| { |
| if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS))) |
| unmask_rm9k_irq(irq); |
| } |
| |
| static hw_irq_controller rm9k_irq_controller = { |
| .typename = "RM9000", |
| .startup = rm9k_cpu_irq_startup, |
| .shutdown = rm9k_cpu_irq_shutdown, |
| .enable = rm9k_cpu_irq_enable, |
| .disable = rm9k_cpu_irq_disable, |
| .ack = rm9k_cpu_irq_ack, |
| .end = rm9k_cpu_irq_end, |
| }; |
| |
| static hw_irq_controller rm9k_perfcounter_irq = { |
| .typename = "RM9000", |
| .startup = rm9k_perfcounter_irq_startup, |
| .shutdown = rm9k_perfcounter_irq_shutdown, |
| .enable = rm9k_cpu_irq_enable, |
| .disable = rm9k_cpu_irq_disable, |
| .ack = rm9k_cpu_irq_ack, |
| .end = rm9k_cpu_irq_end, |
| }; |
| |
| unsigned int rm9000_perfcount_irq; |
| |
| EXPORT_SYMBOL(rm9000_perfcount_irq); |
| |
| void __init rm9k_cpu_irq_init(int base) |
| { |
| int i; |
| |
| clear_c0_intcontrol(0x0000f000); /* Mask all */ |
| |
| for (i = base; i < base + 4; i++) { |
| irq_desc[i].status = IRQ_DISABLED; |
| irq_desc[i].action = NULL; |
| irq_desc[i].depth = 1; |
| irq_desc[i].handler = &rm9k_irq_controller; |
| } |
| |
| rm9000_perfcount_irq = base + 1; |
| irq_desc[rm9000_perfcount_irq].handler = &rm9k_perfcounter_irq; |
| |
| irq_base = base; |
| } |