summaryrefslogtreecommitdiffstats
path: root/arch/mips/tx4938/common/irq_handler.S
blob: 1b2f72bac42df36870aeb10a60112031e59e91aa (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
/*
 * linux/arch/mips/tx4938/common/handler.S
 *
 * Primary interrupt handler for tx4938 based systems
 * Copyright (C) 2000-2001 Toshiba Corporation
 *
 * 2003-2005 (c) MontaVista Software, Inc. This file is licensed under the
 * terms of the GNU General Public License version 2. This program is
 * licensed "as is" without any warranty of any kind, whether express
 * or implied.
 *
 * Support for TX4938 in 2.6 - Manish Lachwani (mlachwani@mvista.com)
 */
#include <asm/asm.h>
#include <asm/mipsregs.h>
#include <asm/addrspace.h>
#include <asm/regdef.h>
#include <asm/stackframe.h>
#include <asm/tx4938/rbtx4938.h>


		.align	5
		NESTED(tx4938_irq_handler, PT_SIZE, sp)
		SAVE_ALL
		CLI
		.set	at

		mfc0	t0, CP0_CAUSE
		mfc0	t1, CP0_STATUS
		and	t0, t1

		andi	t1, t0, STATUSF_IP7	/* cpu timer */
		bnez	t1, ll_ip7

		/* IP6..IP3 multiplexed -- do not use */

		andi	t1, t0, STATUSF_IP2	/* tx4938 pic */
		bnez	t1, ll_ip2

		andi	t1, t0, STATUSF_IP1	/* user line 1 */
		bnez	t1, ll_ip1

		andi	t1, t0, STATUSF_IP0	/* user line 0 */
		bnez	t1, ll_ip0

		.set	reorder

		nop
		END(tx4938_irq_handler)

		.align	5


ll_ip7:
		li	a0, TX4938_IRQ_CPU_TIMER
		move	a1, sp
		jal	do_IRQ
		j	ret_from_irq


ll_ip2:
		jal	tx4938_irq_nested
		nop
		beqz	v0, goto_spurious_interrupt
		nop
		move	a0, v0
		move	a1, sp
		jal	do_IRQ
		j	ret_from_irq

goto_spurious_interrupt:
		j	ret_from_irq

ll_ip1:
		li	a0, TX4938_IRQ_USER1
		move	a1, sp
		jal	do_IRQ
		j	ret_from_irq

ll_ip0:
		li	a0, TX4938_IRQ_USER0
		move	a1, sp
		jal	do_IRQ
		j	ret_from_irq
OpenPOWER on IntegriCloud