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1da177e4 LT |
1 | /* |
2 | * Copyright 2000 MontaVista Software Inc. | |
3 | * Author: MontaVista Software, Inc. | |
4 | * ppopov@mvista.com or source@mvista.com | |
5 | * | |
6 | * This file was derived from Carsten Langgaard's | |
7 | * arch/mips/mips-boards/atlas/atlas_int.c. | |
8 | * | |
9 | * Carsten Langgaard, carstenl@mips.com | |
10 | * Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved. | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify it | |
13 | * under the terms of the GNU General Public License as published by the | |
14 | * Free Software Foundation; either version 2 of the License, or (at your | |
15 | * option) any later version. | |
16 | * | |
17 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
18 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
19 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN | |
20 | * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF | |
23 | * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON | |
24 | * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
27 | * | |
28 | * You should have received a copy of the GNU General Public License along | |
29 | * with this program; if not, write to the Free Software Foundation, Inc., | |
30 | * 675 Mass Ave, Cambridge, MA 02139, USA. | |
31 | */ | |
32 | #include <linux/errno.h> | |
33 | #include <linux/init.h> | |
34 | #include <linux/kernel_stat.h> | |
35 | #include <linux/irq.h> | |
36 | #include <linux/module.h> | |
37 | #include <linux/signal.h> | |
38 | #include <linux/sched.h> | |
39 | #include <linux/types.h> | |
40 | #include <linux/interrupt.h> | |
41 | #include <asm/irq_cpu.h> | |
42 | ||
43 | extern asmlinkage void ev96100IRQ(void); | |
44 | ||
45 | static inline unsigned int ffz8(unsigned int word) | |
46 | { | |
47 | unsigned long k; | |
48 | ||
49 | k = 7; | |
50 | if (word & 0x0fUL) { k -= 4; word <<= 4; } | |
51 | if (word & 0x30UL) { k -= 2; word <<= 2; } | |
52 | if (word & 0x40UL) { k -= 1; } | |
53 | ||
54 | return k; | |
55 | } | |
56 | ||
67cbeb33 | 57 | asmlinkage void ev96100_cpu_irq(unsigned int pending, struct pt_regs *regs) |
1da177e4 LT |
58 | { |
59 | do_IRQ(ffz8(pending >> 8), regs); | |
60 | } | |
61 | ||
62 | void __init arch_init_irq(void) | |
63 | { | |
64 | set_except_vector(0, ev96100IRQ); | |
65 | mips_cpu_irq_init(0); | |
66 | } |