2 * linux/arch/arm/common/vic.c
4 * Copyright (C) 1999 - 2003 ARM Limited
5 * Copyright (C) 2000 Deep Blue Solutions Ltd
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.
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.
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
21 #include <linux/init.h>
22 #include <linux/list.h>
25 #include <asm/mach/irq.h>
26 #include <asm/hardware/vic.h>
28 static void vic_mask_irq(unsigned int irq)
30 void __iomem *base = get_irq_chip_data(irq);
32 writel(1 << irq, base + VIC_INT_ENABLE_CLEAR);
35 static void vic_unmask_irq(unsigned int irq)
37 void __iomem *base = get_irq_chip_data(irq);
39 writel(1 << irq, base + VIC_INT_ENABLE);
42 static struct irq_chip vic_chip = {
46 .unmask = vic_unmask_irq,
50 * vic_init - initialise a vectored interrupt controller
51 * @base: iomem base address
52 * @irq_start: starting interrupt number, must be muliple of 32
53 * @vic_sources: bitmask of interrupt sources to allow
55 void __init vic_init(void __iomem *base, unsigned int irq_start,
60 /* Disable all interrupts initially. */
62 writel(0, base + VIC_INT_SELECT);
63 writel(0, base + VIC_INT_ENABLE);
64 writel(~0, base + VIC_INT_ENABLE_CLEAR);
65 writel(0, base + VIC_IRQ_STATUS);
66 writel(0, base + VIC_ITCR);
67 writel(~0, base + VIC_INT_SOFT_CLEAR);
70 * Make sure we clear all existing interrupts
72 writel(0, base + VIC_VECT_ADDR);
73 for (i = 0; i < 19; i++) {
76 value = readl(base + VIC_VECT_ADDR);
77 writel(value, base + VIC_VECT_ADDR);
80 for (i = 0; i < 16; i++) {
81 void __iomem *reg = base + VIC_VECT_CNTL0 + (i * 4);
82 writel(VIC_VECT_CNTL_ENABLE | i, reg);
85 writel(32, base + VIC_DEF_VECT_ADDR);
87 for (i = 0; i < 32; i++) {
88 unsigned int irq = irq_start + i;
90 set_irq_chip(irq, &vic_chip);
91 set_irq_chip_data(irq, base);
93 if (vic_sources & (1 << i)) {
94 set_irq_handler(irq, handle_level_irq);
95 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);