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_chipdata(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_chipdata(irq);
39 writel(1 << irq, base + VIC_INT_ENABLE);
42 static struct irqchip vic_chip = {
45 .unmask = vic_unmask_irq,
49 * vic_init - initialise a vectored interrupt controller
50 * @base: iomem base address
51 * @irq_start: starting interrupt number, must be muliple of 32
52 * @vic_sources: bitmask of interrupt sources to allow
54 void __init vic_init(void __iomem *base, unsigned int irq_start,
59 /* Disable all interrupts initially. */
61 writel(0, base + VIC_INT_SELECT);
62 writel(0, base + VIC_INT_ENABLE);
63 writel(~0, base + VIC_INT_ENABLE_CLEAR);
64 writel(0, base + VIC_IRQ_STATUS);
65 writel(0, base + VIC_ITCR);
66 writel(~0, base + VIC_INT_SOFT_CLEAR);
69 * Make sure we clear all existing interrupts
71 writel(0, base + VIC_VECT_ADDR);
72 for (i = 0; i < 19; i++) {
75 value = readl(base + VIC_VECT_ADDR);
76 writel(value, base + VIC_VECT_ADDR);
79 for (i = 0; i < 16; i++) {
80 void __iomem *reg = base + VIC_VECT_CNTL0 + (i * 4);
81 writel(VIC_VECT_CNTL_ENABLE | i, reg);
84 writel(32, base + VIC_DEF_VECT_ADDR);
86 for (i = 0; i < 32; i++) {
87 unsigned int irq = irq_start + i;
89 set_irq_chip(irq, &vic_chip);
90 set_irq_chipdata(irq, base);
92 if (vic_sources & (1 << i)) {
93 set_irq_handler(irq, do_level_IRQ);
94 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);