| Russell King | fa0fe48 | 2006-01-13 21:30:48 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * linux/arch/arm/common/vic.c |
| 3 | * |
| 4 | * Copyright (C) 1999 - 2003 ARM Limited |
| 5 | * Copyright (C) 2000 Deep Blue Solutions Ltd |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 20 | */ |
| 21 | #include <linux/init.h> |
| 22 | #include <linux/list.h> |
| 23 | |
| 24 | #include <asm/io.h> |
| 25 | #include <asm/irq.h> |
| 26 | #include <asm/mach/irq.h> |
| 27 | #include <asm/hardware/vic.h> |
| 28 | |
| 29 | static void __iomem *vic_base; |
| 30 | |
| 31 | static void vic_mask_irq(unsigned int irq) |
| 32 | { |
| 33 | irq -= IRQ_VIC_START; |
| 34 | writel(1 << irq, vic_base + VIC_INT_ENABLE_CLEAR); |
| 35 | } |
| 36 | |
| 37 | static void vic_unmask_irq(unsigned int irq) |
| 38 | { |
| 39 | irq -= IRQ_VIC_START; |
| 40 | writel(1 << irq, vic_base + VIC_INT_ENABLE); |
| 41 | } |
| 42 | |
| 43 | static struct irqchip vic_chip = { |
| 44 | .ack = vic_mask_irq, |
| 45 | .mask = vic_mask_irq, |
| 46 | .unmask = vic_unmask_irq, |
| 47 | }; |
| 48 | |
| 49 | void __init vic_init(void __iomem *base, u32 vic_sources) |
| 50 | { |
| 51 | unsigned int i; |
| 52 | |
| 53 | vic_base = base; |
| 54 | |
| 55 | /* Disable all interrupts initially. */ |
| 56 | |
| 57 | writel(0, vic_base + VIC_INT_SELECT); |
| 58 | writel(0, vic_base + VIC_INT_ENABLE); |
| 59 | writel(~0, vic_base + VIC_INT_ENABLE_CLEAR); |
| 60 | writel(0, vic_base + VIC_IRQ_STATUS); |
| 61 | writel(0, vic_base + VIC_ITCR); |
| 62 | writel(~0, vic_base + VIC_INT_SOFT_CLEAR); |
| 63 | |
| 64 | /* |
| 65 | * Make sure we clear all existing interrupts |
| 66 | */ |
| 67 | writel(0, vic_base + VIC_VECT_ADDR); |
| 68 | for (i = 0; i < 19; i++) { |
| 69 | unsigned int value; |
| 70 | |
| 71 | value = readl(vic_base + VIC_VECT_ADDR); |
| 72 | writel(value, vic_base + VIC_VECT_ADDR); |
| 73 | } |
| 74 | |
| 75 | for (i = 0; i < 16; i++) { |
| 76 | void __iomem *reg = vic_base + VIC_VECT_CNTL0 + (i * 4); |
| 77 | writel(VIC_VECT_CNTL_ENABLE | i, reg); |
| 78 | } |
| 79 | |
| 80 | writel(32, vic_base + VIC_DEF_VECT_ADDR); |
| 81 | |
| 82 | for (i = 0; i < 32; i++) { |
| 83 | unsigned int irq = IRQ_VIC_START + i; |
| 84 | |
| 85 | set_irq_chip(irq, &vic_chip); |
| 86 | |
| 87 | if (vic_sources & (1 << i)) { |
| 88 | set_irq_handler(irq, do_level_IRQ); |
| 89 | set_irq_flags(irq, IRQF_VALID | IRQF_PROBE); |
| 90 | } |
| 91 | } |
| 92 | } |