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_NIPRIORITY7 (AVIC_BASE + 0x20) /* norm int priority lvl7 */
34 #define AVIC_NIPRIORITY6 (AVIC_BASE + 0x24) /* norm int priority lvl6 */
35 #define AVIC_NIPRIORITY5 (AVIC_BASE + 0x28) /* norm int priority lvl5 */
36 #define AVIC_NIPRIORITY4 (AVIC_BASE + 0x2C) /* norm int priority lvl4 */
37 #define AVIC_NIPRIORITY3 (AVIC_BASE + 0x30) /* norm int priority lvl3 */
38 #define AVIC_NIPRIORITY2 (AVIC_BASE + 0x34) /* norm int priority lvl2 */
39 #define AVIC_NIPRIORITY1 (AVIC_BASE + 0x38) /* norm int priority lvl1 */
40 #define AVIC_NIPRIORITY0 (AVIC_BASE + 0x3C) /* norm int priority lvl0 */
41 #define AVIC_NIVECSR (AVIC_BASE + 0x40) /* norm int vector/status */
42 #define AVIC_FIVECSR (AVIC_BASE + 0x44) /* fast int vector/status */
43 #define AVIC_INTSRCH (AVIC_BASE + 0x48) /* int source reg high */
44 #define AVIC_INTSRCL (AVIC_BASE + 0x4C) /* int source reg low */
45 #define AVIC_INTFRCH (AVIC_BASE + 0x50) /* int force reg high */
46 #define AVIC_INTFRCL (AVIC_BASE + 0x54) /* int force reg low */
47 #define AVIC_NIPNDH (AVIC_BASE + 0x58) /* norm int pending high */
48 #define AVIC_NIPNDL (AVIC_BASE + 0x5C) /* norm int pending low */
49 #define AVIC_FIPNDH (AVIC_BASE + 0x60) /* fast int pending high */
50 #define AVIC_FIPNDL (AVIC_BASE + 0x64) /* fast int pending low */
52 #define SYSTEM_PREV_REG IO_ADDRESS(IIM_BASE_ADDR + 0x20)
53 #define SYSTEM_SREV_REG IO_ADDRESS(IIM_BASE_ADDR + 0x24)
54 #define IIM_PROD_REV_SH 3
55 #define IIM_PROD_REV_LEN 5
57 /* Disable interrupt number "irq" in the AVIC */
58 static void mxc_mask_irq(unsigned int irq)
60 __raw_writel(irq, AVIC_INTDISNUM);
63 /* Enable interrupt number "irq" in the AVIC */
64 static void mxc_unmask_irq(unsigned int irq)
66 __raw_writel(irq, AVIC_INTENNUM);
69 static struct irq_chip mxc_avic_chip = {
72 .unmask = mxc_unmask_irq,
76 * This function initializes the AVIC hardware and disables all the
77 * interrupts. It registers the interrupt enable and disable functions
78 * to the kernel for each interrupt source.
80 void __init mxc_init_irq(void)
85 /* put the AVIC into the reset value with
86 * all interrupts disabled
88 __raw_writel(0, AVIC_INTCNTL);
89 __raw_writel(0x1f, AVIC_NIMASK);
91 /* disable all interrupts */
92 __raw_writel(0, AVIC_INTENABLEH);
93 __raw_writel(0, AVIC_INTENABLEL);
96 __raw_writel(0, AVIC_INTTYPEH);
97 __raw_writel(0, AVIC_INTTYPEL);
98 for (i = 0; i < MXC_MAX_INT_LINES; i++) {
99 set_irq_chip(i, &mxc_avic_chip);
100 set_irq_handler(i, handle_level_irq);
101 set_irq_flags(i, IRQF_VALID);
104 /* Set WDOG2's interrupt the highest priority level (bit 28-31) */
105 reg = __raw_readl(AVIC_NIPRIORITY6);
107 __raw_writel(reg, AVIC_NIPRIORITY6);
109 /* init architectures chained interrupt handler */
110 mxc_register_gpios();
112 printk(KERN_INFO "MXC IRQ initialized\n");