2 * Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved.
3 * Copyright 2008 Juergen Beisert, kernel@pengutronix.de
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version 2
8 * of the License, or (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
20 #include <linux/irq.h>
22 #include <mach/common.h>
24 #define AVIC_BASE IO_ADDRESS(AVIC_BASE_ADDR)
25 #define AVIC_INTCNTL (AVIC_BASE + 0x00) /* int control reg */
26 #define AVIC_NIMASK (AVIC_BASE + 0x04) /* int mask reg */
27 #define AVIC_INTENNUM (AVIC_BASE + 0x08) /* int enable number reg */
28 #define AVIC_INTDISNUM (AVIC_BASE + 0x0C) /* int disable number reg */
29 #define AVIC_INTENABLEH (AVIC_BASE + 0x10) /* int enable reg high */
30 #define AVIC_INTENABLEL (AVIC_BASE + 0x14) /* int enable reg low */
31 #define AVIC_INTTYPEH (AVIC_BASE + 0x18) /* int type reg high */
32 #define AVIC_INTTYPEL (AVIC_BASE + 0x1C) /* int type reg low */
33 #define AVIC_NIPRIORITY(x) (AVIC_BASE + (0x20 + 4 * (7 - (x)))) /* int priority */
34 #define AVIC_NIVECSR (AVIC_BASE + 0x40) /* norm int vector/status */
35 #define AVIC_FIVECSR (AVIC_BASE + 0x44) /* fast int vector/status */
36 #define AVIC_INTSRCH (AVIC_BASE + 0x48) /* int source reg high */
37 #define AVIC_INTSRCL (AVIC_BASE + 0x4C) /* int source reg low */
38 #define AVIC_INTFRCH (AVIC_BASE + 0x50) /* int force reg high */
39 #define AVIC_INTFRCL (AVIC_BASE + 0x54) /* int force reg low */
40 #define AVIC_NIPNDH (AVIC_BASE + 0x58) /* norm int pending high */
41 #define AVIC_NIPNDL (AVIC_BASE + 0x5C) /* norm int pending low */
42 #define AVIC_FIPNDH (AVIC_BASE + 0x60) /* fast int pending high */
43 #define AVIC_FIPNDL (AVIC_BASE + 0x64) /* fast int pending low */
45 #define SYSTEM_PREV_REG IO_ADDRESS(IIM_BASE_ADDR + 0x20)
46 #define SYSTEM_SREV_REG IO_ADDRESS(IIM_BASE_ADDR + 0x24)
47 #define IIM_PROD_REV_SH 3
48 #define IIM_PROD_REV_LEN 5
50 #ifdef CONFIG_MXC_IRQ_PRIOR
51 void imx_irq_set_priority(unsigned char irq, unsigned char prio)
54 unsigned int mask = 0x0F << irq % 8 * 4;
59 temp = __raw_readl(AVIC_NIPRIORITY(irq / 8));
63 __raw_writel(temp, AVIC_NIPRIORITY(irq / 8));
65 EXPORT_SYMBOL(imx_irq_set_priority);
68 /* Disable interrupt number "irq" in the AVIC */
69 static void mxc_mask_irq(unsigned int irq)
71 __raw_writel(irq, AVIC_INTDISNUM);
74 /* Enable interrupt number "irq" in the AVIC */
75 static void mxc_unmask_irq(unsigned int irq)
77 __raw_writel(irq, AVIC_INTENNUM);
80 static struct irq_chip mxc_avic_chip = {
83 .unmask = mxc_unmask_irq,
87 * This function initializes the AVIC hardware and disables all the
88 * interrupts. It registers the interrupt enable and disable functions
89 * to the kernel for each interrupt source.
91 void __init mxc_init_irq(void)
96 /* put the AVIC into the reset value with
97 * all interrupts disabled
99 __raw_writel(0, AVIC_INTCNTL);
100 __raw_writel(0x1f, AVIC_NIMASK);
102 /* disable all interrupts */
103 __raw_writel(0, AVIC_INTENABLEH);
104 __raw_writel(0, AVIC_INTENABLEL);
107 __raw_writel(0, AVIC_INTTYPEH);
108 __raw_writel(0, AVIC_INTTYPEL);
109 for (i = 0; i < MXC_MAX_INT_LINES; i++) {
110 set_irq_chip(i, &mxc_avic_chip);
111 set_irq_handler(i, handle_level_irq);
112 set_irq_flags(i, IRQF_VALID);
115 /* Set default priority value (0) for all IRQ's */
116 for (i = 0; i < 8; i++)
117 __raw_writel(0, AVIC_NIPRIORITY(i));
119 /* init architectures chained interrupt handler */
120 mxc_register_gpios();
122 printk(KERN_INFO "MXC IRQ initialized\n");