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1/*
2 * Carsten Langgaard, carstenl@mips.com
3 * Copyright (C) 1999, 2000 MIPS Technologies, Inc. All rights reserved.
4 *
5 * ########################################################################
6 *
7 * This program is free software; you can distribute it and/or modify it
8 * under the terms of the GNU General Public License (Version 2) as
9 * published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * for more details.
15 *
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
19 *
20 * ########################################################################
21 *
22 * Interrupt exception dispatch code.
23 *
24 */
25#include <linux/config.h>
26
27#include <asm/asm.h>
28#include <asm/mipsregs.h>
29#include <asm/regdef.h>
30#include <asm/stackframe.h>
31#include <asm/mips-boards/maltaint.h>
32
33/*
34 * IRQs on the Malta board look basically (barring software IRQs which we
35 * don't use at all and all external interrupt sources are combined together
36 * on hardware interrupt 0 (MIPS IRQ 2)) like:
37 *
38 * MIPS IRQ Source
39 * -------- ------
40 * 0 Software (ignored)
41 * 1 Software (ignored)
42 * 2 Combined hardware interrupt (hw0)
43 * 3 Hardware (ignored)
44 * 4 Hardware (ignored)
45 * 5 Hardware (ignored)
46 * 6 Hardware (ignored)
47 * 7 R4k timer (what we use)
48 *
49 * We handle the IRQ according to _our_ priority which is:
50 *
51 * Highest ---- R4k Timer
52 * Lowest ---- Combined hardware interrupt
53 *
54 * then we just return, if multiple IRQs are pending then we will just take
55 * another exception, big deal.
56 */
57
58 .text
59 .set noreorder
60 .set noat
61 .align 5
62 NESTED(mipsIRQ, PT_SIZE, sp)
63 SAVE_ALL
64 CLI
65 .set at
66
67 mfc0 s0, CP0_CAUSE # get irq bits
68 mfc0 s1, CP0_STATUS # get irq mask
69 andi s0, ST0_IM # CAUSE.CE may be non-zero!
70 and s0, s1
71
72#if defined(CONFIG_CPU_MIPS32) || defined(CONFIG_CPU_MIPS64)
73 .set mips32
74 clz a0, s0
75 .set mips0
76 negu a0
77 addu a0, 31-CAUSEB_IP
78 bltz a0, spurious
79#else
80 beqz s0, spurious
81 li a0, 7
82
83 and t0, s0, 0xf000
84 sltiu t0, t0, 1
85 sll t0, 2
86 subu a0, t0
87 sll s0, t0
88
89 and t0, s0, 0xc000
90 sltiu t0, t0, 1
91 sll t0, 1
92 subu a0, t0
93 sll s0, t0
94
95 and t0, s0, 0x8000
96 sltiu t0, t0, 1
97 # sll t0, 0
98 subu a0, t0
99 # sll s0, t0
100#endif
101
102 li a1, MIPSCPU_INT_I8259A
103 bne a0, a1, 1f
104 addu a0, MIPSCPU_INT_BASE
105
106 jal malta_hw0_irqdispatch
107 move a0, sp
108
109 j ret_from_irq
110 nop
1111:
112
113 jal do_IRQ
114 move a1, sp
115
116 j ret_from_irq
117 nop
118
119spurious:
120 j spurious_interrupt
121 nop
122 END(mipsIRQ)