projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
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 RM9000 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 | #include <linux/module.h> | |
| 16 | ||
| 17 | #include <asm/irq_cpu.h> | |
| 18 | #include <asm/mipsregs.h> | |
| 19 | #include <asm/system.h> | |
| 20 | ||
| 21 | static int irq_base; | |
| 22 | ||
| 23 | static inline void unmask_rm9k_irq(unsigned int irq) | |
| 24 | { | |
| 25 | set_c0_intcontrol(0x1000 << (irq - irq_base)); | |
| 26 | } | |
| 27 | ||
| 28 | static inline void mask_rm9k_irq(unsigned int irq) | |
| 29 | { | |
| 30 | clear_c0_intcontrol(0x1000 << (irq - irq_base)); | |
| 31 | } | |
| 32 | ||
| 33 | static inline void rm9k_cpu_irq_enable(unsigned int irq) | |
| 34 | { | |
| 35 | unsigned long flags; | |
| 36 | ||
| 37 | local_irq_save(flags); | |
| 38 | unmask_rm9k_irq(irq); | |
| 39 | local_irq_restore(flags); | |
| 40 | } | |
| 41 | ||
| 42 | static void rm9k_cpu_irq_disable(unsigned int irq) | |
| 43 | { | |
| 44 | unsigned long flags; | |
| 45 | ||
| 46 | local_irq_save(flags); | |
| 47 | mask_rm9k_irq(irq); | |
| 48 | local_irq_restore(flags); | |
| 49 | } | |
| 50 | ||
| 1da177e4 LT |
51 | /* |
| 52 | * Performance counter interrupts are global on all processors. | |
| 53 | */ | |
| 54 | static void local_rm9k_perfcounter_irq_startup(void *args) | |
| 55 | { | |
| 56 | unsigned int irq = (unsigned int) args; | |
| 57 | ||
| 58 | rm9k_cpu_irq_enable(irq); | |
| 59 | } | |
| 60 | ||
| 61 | static unsigned int rm9k_perfcounter_irq_startup(unsigned int irq) | |
| 62 | { | |
| 63 | on_each_cpu(local_rm9k_perfcounter_irq_startup, (void *) irq, 0, 1); | |
| 64 | ||
| 65 | return 0; | |
| 66 | } | |
| 67 | ||
| 68 | static void local_rm9k_perfcounter_irq_shutdown(void *args) | |
| 69 | { | |
| 70 | unsigned int irq = (unsigned int) args; | |
| 71 | unsigned long flags; | |
| 72 | ||
| 73 | local_irq_save(flags); | |
| 74 | mask_rm9k_irq(irq); | |
| 75 | local_irq_restore(flags); | |
| 76 | } | |
| 77 | ||
| 78 | static void rm9k_perfcounter_irq_shutdown(unsigned int irq) | |
| 79 | { | |
| 80 | on_each_cpu(local_rm9k_perfcounter_irq_shutdown, (void *) irq, 0, 1); | |
| 81 | } | |
| 82 | ||
| 1da177e4 LT |
83 | static void rm9k_cpu_irq_end(unsigned int irq) |
| 84 | { | |
| 85 | if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS))) | |
| 86 | unmask_rm9k_irq(irq); | |
| 87 | } | |
| 88 | ||
| 94dee171 | 89 | static struct irq_chip rm9k_irq_controller = { |
| 8ab00b9a | 90 | .typename = "RM9000", |
| 1603b5ac AN |
91 | .ack = mask_rm9k_irq, |
| 92 | .mask = mask_rm9k_irq, | |
| 93 | .mask_ack = mask_rm9k_irq, | |
| 94 | .unmask = unmask_rm9k_irq, | |
| 8ab00b9a | 95 | .end = rm9k_cpu_irq_end, |
| 1da177e4 LT |
96 | }; |
| 97 | ||
| 94dee171 | 98 | static struct irq_chip rm9k_perfcounter_irq = { |
| 8ab00b9a RB |
99 | .typename = "RM9000", |
| 100 | .startup = rm9k_perfcounter_irq_startup, | |
| 101 | .shutdown = rm9k_perfcounter_irq_shutdown, | |
| 1603b5ac AN |
102 | .ack = mask_rm9k_irq, |
| 103 | .mask = mask_rm9k_irq, | |
| 104 | .mask_ack = mask_rm9k_irq, | |
| 105 | .unmask = unmask_rm9k_irq, | |
| 8ab00b9a | 106 | .end = rm9k_cpu_irq_end, |
| 1da177e4 LT |
107 | }; |
| 108 | ||
| 109 | unsigned int rm9000_perfcount_irq; | |
| 110 | ||
| 111 | EXPORT_SYMBOL(rm9000_perfcount_irq); | |
| 112 | ||
| 113 | void __init rm9k_cpu_irq_init(int base) | |
| 114 | { | |
| 115 | int i; | |
| 116 | ||
| 117 | clear_c0_intcontrol(0x0000f000); /* Mask all */ | |
| 118 | ||
| 1603b5ac | 119 | for (i = base; i < base + 4; i++) |
| 1417836e AN |
120 | set_irq_chip_and_handler(i, &rm9k_irq_controller, |
| 121 | handle_level_irq); | |
| 1da177e4 LT |
122 | |
| 123 | rm9000_perfcount_irq = base + 1; | |
| 1417836e AN |
124 | set_irq_chip_and_handler(rm9000_perfcount_irq, &rm9k_perfcounter_irq, |
| 125 | handle_level_irq); | |
| 1da177e4 LT |
126 | |
| 127 | irq_base = base; | |
| 128 | } |