| Uwe Kleine-König | 9918cda | 2007-02-16 15:36:55 +0100 | [diff] [blame] | 1 | /* |
| 2 | * arch/arm/mach-ns9xxx/irq.c |
| 3 | * |
| 4 | * Copyright (C) 2006,2007 by Digi International Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify it |
| 8 | * under the terms of the GNU General Public License version 2 as published by |
| 9 | * the Free Software Foundation. |
| 10 | */ |
| 11 | #include <linux/interrupt.h> |
| 12 | #include <asm/mach/irq.h> |
| 13 | #include <asm/mach-types.h> |
| 14 | #include <asm/arch-ns9xxx/regs-sys.h> |
| 15 | #include <asm/arch-ns9xxx/irqs.h> |
| 16 | #include <asm/arch-ns9xxx/board.h> |
| 17 | |
| 18 | #include "generic.h" |
| 19 | |
| 20 | static void ns9xxx_ack_irq_timer(unsigned int irq) |
| 21 | { |
| 22 | u32 tc = SYS_TC(irq - IRQ_TIMER0); |
| 23 | |
| 24 | REGSET(tc, SYS_TCx, INTC, SET); |
| 25 | SYS_TC(irq - IRQ_TIMER0) = tc; |
| 26 | |
| 27 | REGSET(tc, SYS_TCx, INTC, UNSET); |
| 28 | SYS_TC(irq - IRQ_TIMER0) = tc; |
| 29 | } |
| 30 | |
| 31 | void (*ns9xxx_ack_irq_functions[NR_IRQS])(unsigned int) = { |
| 32 | [IRQ_TIMER0] = ns9xxx_ack_irq_timer, |
| 33 | [IRQ_TIMER1] = ns9xxx_ack_irq_timer, |
| 34 | [IRQ_TIMER2] = ns9xxx_ack_irq_timer, |
| 35 | [IRQ_TIMER3] = ns9xxx_ack_irq_timer, |
| 36 | }; |
| 37 | |
| 38 | static void ns9xxx_mask_irq(unsigned int irq) |
| 39 | { |
| 40 | /* XXX: better use cpp symbols */ |
| 41 | SYS_IC(irq / 4) &= ~(1 << (7 + 8 * (3 - (irq & 3)))); |
| 42 | } |
| 43 | |
| 44 | static void ns9xxx_ack_irq(unsigned int irq) |
| 45 | { |
| 46 | if (!ns9xxx_ack_irq_functions[irq]) { |
| 47 | printk(KERN_ERR "no ack function for irq %u\n", irq); |
| 48 | BUG(); |
| 49 | } |
| 50 | |
| 51 | ns9xxx_ack_irq_functions[irq](irq); |
| 52 | SYS_ISRADDR = 0; |
| 53 | } |
| 54 | |
| 55 | static void ns9xxx_maskack_irq(unsigned int irq) |
| 56 | { |
| 57 | ns9xxx_mask_irq(irq); |
| 58 | ns9xxx_ack_irq(irq); |
| 59 | } |
| 60 | |
| 61 | static void ns9xxx_unmask_irq(unsigned int irq) |
| 62 | { |
| 63 | /* XXX: better use cpp symbols */ |
| 64 | SYS_IC(irq / 4) |= 1 << (7 + 8 * (3 - (irq & 3))); |
| 65 | } |
| 66 | |
| 67 | static struct irq_chip ns9xxx_chip = { |
| 68 | .ack = ns9xxx_ack_irq, |
| 69 | .mask = ns9xxx_mask_irq, |
| 70 | .mask_ack = ns9xxx_maskack_irq, |
| 71 | .unmask = ns9xxx_unmask_irq, |
| 72 | }; |
| 73 | |
| 74 | void __init ns9xxx_init_irq(void) |
| 75 | { |
| 76 | int i; |
| 77 | |
| 78 | /* disable all IRQs */ |
| 79 | for (i = 0; i < 8; ++i) |
| 80 | SYS_IC(i) = (4 * i) << 24 | (4 * i + 1) << 16 | |
| 81 | (4 * i + 2) << 8 | (4 * i + 3); |
| 82 | |
| 83 | /* simple interrupt prio table: |
| 84 | * prio(x) < prio(y) <=> x < y |
| 85 | */ |
| 86 | for (i = 0; i < 32; ++i) |
| 87 | SYS_IVA(i) = i; |
| 88 | |
| 89 | for (i = IRQ_WATCHDOG; i <= IRQ_EXT3; ++i) { |
| 90 | set_irq_chip(i, &ns9xxx_chip); |
| 91 | set_irq_handler(i, handle_level_irq); |
| 92 | set_irq_flags(i, IRQF_VALID); |
| 93 | } |
| 94 | } |