1/*
2 *  arch/mips/emma2rh/common/irq.c
3 *      This file is common irq dispatcher.
4 *
5 *  Copyright (C) NEC Electronics Corporation 2005-2006
6 *
7 *  This file is based on the arch/mips/ddb5xxx/ddb5477/irq.c
8 *
9 *	Copyright 2001 MontaVista Software Inc.
10 *
11 *  This program is free software; you can redistribute it and/or modify
12 *  it under the terms of the GNU General Public License as published by
13 *  the Free Software Foundation; either version 2 of the License, or
14 *  (at your option) any later version.
15 *
16 *  This program is distributed in the hope that it will be useful,
17 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
18 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19 *  GNU General Public License for more details.
20 *
21 *  You should have received a copy of the GNU General Public License
22 *  along with this program; if not, write to the Free Software
23 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
24 */
25#include <linux/init.h>
26#include <linux/interrupt.h>
27#include <linux/irq.h>
28#include <linux/types.h>
29
30#include <asm/system.h>
31#include <asm/mipsregs.h>
32#include <asm/debug.h>
33#include <asm/addrspace.h>
34#include <asm/bootinfo.h>
35
36#include <asm/emma2rh/emma2rh.h>
37
38/*
39 * the first level int-handler will jump here if it is a emma2rh irq
40 */
41void emma2rh_irq_dispatch(void)
42{
43	u32 intStatus;
44	u32 bitmask;
45	u32 i;
46
47	intStatus = emma2rh_in32(EMMA2RH_BHIF_INT_ST_0)
48	    & emma2rh_in32(EMMA2RH_BHIF_INT_EN_0);
49
50#ifdef EMMA2RH_SW_CASCADE
51	if (intStatus &
52	    (1 << ((EMMA2RH_SW_CASCADE - EMMA2RH_IRQ_INT0) & (32 - 1)))) {
53		u32 swIntStatus;
54		swIntStatus = emma2rh_in32(EMMA2RH_BHIF_SW_INT)
55		    & emma2rh_in32(EMMA2RH_BHIF_SW_INT_EN);
56		for (i = 0, bitmask = 1; i < 32; i++, bitmask <<= 1) {
57			if (swIntStatus & bitmask) {
58				do_IRQ(EMMA2RH_SW_IRQ_BASE + i);
59				return;
60			}
61		}
62	}
63#endif
64
65	for (i = 0, bitmask = 1; i < 32; i++, bitmask <<= 1) {
66		if (intStatus & bitmask) {
67			do_IRQ(EMMA2RH_IRQ_BASE + i);
68			return;
69		}
70	}
71
72	intStatus = emma2rh_in32(EMMA2RH_BHIF_INT_ST_1)
73	    & emma2rh_in32(EMMA2RH_BHIF_INT_EN_1);
74
75#ifdef EMMA2RH_GPIO_CASCADE
76	if (intStatus &
77	    (1 << ((EMMA2RH_GPIO_CASCADE - EMMA2RH_IRQ_INT0) & (32 - 1)))) {
78		u32 gpioIntStatus;
79		gpioIntStatus = emma2rh_in32(EMMA2RH_GPIO_INT_ST)
80		    & emma2rh_in32(EMMA2RH_GPIO_INT_MASK);
81		for (i = 0, bitmask = 1; i < 32; i++, bitmask <<= 1) {
82			if (gpioIntStatus & bitmask) {
83				do_IRQ(EMMA2RH_GPIO_IRQ_BASE + i);
84				return;
85			}
86		}
87	}
88#endif
89
90	for (i = 32, bitmask = 1; i < 64; i++, bitmask <<= 1) {
91		if (intStatus & bitmask) {
92			do_IRQ(EMMA2RH_IRQ_BASE + i);
93			return;
94		}
95	}
96
97	intStatus = emma2rh_in32(EMMA2RH_BHIF_INT_ST_2)
98	    & emma2rh_in32(EMMA2RH_BHIF_INT_EN_2);
99
100	for (i = 64, bitmask = 1; i < 96; i++, bitmask <<= 1) {
101		if (intStatus & bitmask) {
102			do_IRQ(EMMA2RH_IRQ_BASE + i);
103			return;
104		}
105	}
106}
107