Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2003 Ralf Baechle |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify it |
| 5 | * under the terms of the GNU General Public License as published by the |
| 6 | * Free Software Foundation; either version 2 of the License, or (at your |
| 7 | * option) any later version. |
| 8 | * |
| 9 | * Handler for RM7000 extended interrupts. These are a non-standard |
| 10 | * feature so we handle them separately from standard interrupts. |
| 11 | */ |
| 12 | #include <linux/init.h> |
| 13 | #include <linux/interrupt.h> |
| 14 | #include <linux/kernel.h> |
| 15 | |
| 16 | #include <asm/irq_cpu.h> |
| 17 | #include <asm/mipsregs.h> |
| 18 | #include <asm/system.h> |
| 19 | |
| 20 | static int irq_base; |
| 21 | |
| 22 | static inline void unmask_rm7k_irq(unsigned int irq) |
| 23 | { |
| 24 | set_c0_intcontrol(0x100 << (irq - irq_base)); |
| 25 | } |
| 26 | |
| 27 | static inline void mask_rm7k_irq(unsigned int irq) |
| 28 | { |
| 29 | clear_c0_intcontrol(0x100 << (irq - irq_base)); |
| 30 | } |
| 31 | |
| 32 | static inline void rm7k_cpu_irq_enable(unsigned int irq) |
| 33 | { |
| 34 | unsigned long flags; |
| 35 | |
| 36 | local_irq_save(flags); |
| 37 | unmask_rm7k_irq(irq); |
| 38 | local_irq_restore(flags); |
| 39 | } |
| 40 | |
| 41 | static void rm7k_cpu_irq_disable(unsigned int irq) |
| 42 | { |
| 43 | unsigned long flags; |
| 44 | |
| 45 | local_irq_save(flags); |
| 46 | mask_rm7k_irq(irq); |
| 47 | local_irq_restore(flags); |
| 48 | } |
| 49 | |
| 50 | static unsigned int rm7k_cpu_irq_startup(unsigned int irq) |
| 51 | { |
| 52 | rm7k_cpu_irq_enable(irq); |
| 53 | |
| 54 | return 0; |
| 55 | } |
| 56 | |
| 57 | #define rm7k_cpu_irq_shutdown rm7k_cpu_irq_disable |
| 58 | |
| 59 | /* |
| 60 | * While we ack the interrupt interrupts are disabled and thus we don't need |
| 61 | * to deal with concurrency issues. Same for rm7k_cpu_irq_end. |
| 62 | */ |
| 63 | static void rm7k_cpu_irq_ack(unsigned int irq) |
| 64 | { |
| 65 | mask_rm7k_irq(irq); |
| 66 | } |
| 67 | |
| 68 | static void rm7k_cpu_irq_end(unsigned int irq) |
| 69 | { |
| 70 | if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS))) |
| 71 | unmask_rm7k_irq(irq); |
| 72 | } |
| 73 | |
| 74 | static hw_irq_controller rm7k_irq_controller = { |
| 75 | "RM7000", |
| 76 | rm7k_cpu_irq_startup, |
| 77 | rm7k_cpu_irq_shutdown, |
| 78 | rm7k_cpu_irq_enable, |
| 79 | rm7k_cpu_irq_disable, |
| 80 | rm7k_cpu_irq_ack, |
| 81 | rm7k_cpu_irq_end, |
| 82 | }; |
| 83 | |
| 84 | void __init rm7k_cpu_irq_init(int base) |
| 85 | { |
| 86 | int i; |
| 87 | |
| 88 | clear_c0_intcontrol(0x00000f00); /* Mask all */ |
| 89 | |
| 90 | for (i = base; i < base + 4; i++) { |
| 91 | irq_desc[i].status = IRQ_DISABLED; |
| 92 | irq_desc[i].action = NULL; |
| 93 | irq_desc[i].depth = 1; |
| 94 | irq_desc[i].handler = &rm7k_irq_controller; |
| 95 | } |
| 96 | |
| 97 | irq_base = base; |
| 98 | } |