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 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 = { | |
| 8ab00b9a RB |
75 | .typename = "RM7000", |
| 76 | .startup = rm7k_cpu_irq_startup, | |
| 77 | .shutdown = rm7k_cpu_irq_shutdown, | |
| 78 | .enable = rm7k_cpu_irq_enable, | |
| 79 | .disable = rm7k_cpu_irq_disable, | |
| 80 | .ack = rm7k_cpu_irq_ack, | |
| 81 | .end = rm7k_cpu_irq_end, | |
| 1da177e4 LT |
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 | } |