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gerrit-public.fairphone.software / kernel / msm-4.9 / 951e4714295b50a8fbc2d928451c44ac56c2b575 / . / arch / mips / lasat / interrupt.c
blob: 5f35289bfff58b30232e6913756eed2bbcf48a3e [file] [log] [blame]
Brian Murphy1f21d2b2007-08-21 22:34:16 +0200[diff] [blame]1/*
2 * Carsten Langgaard, carstenl@mips.com
3 * Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved.
4 *
5 * This program is free software; you can distribute it and/or modify it
6 * under the terms of the GNU General Public License (Version 2) as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * for more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
17 *
18 * Routines for generic manipulation of the interrupts found on the
19 * Lasat boards.
20 */
21#include <linux/init.h>
22#include <linux/irq.h>
23#include <linux/sched.h>
24#include <linux/slab.h>
25#include <linux/interrupt.h>
26#include <linux/kernel_stat.h>
27
28#include <asm/bootinfo.h>
29#include <asm/lasat/lasatint.h>
30#include <asm/time.h>
31#include <asm/gdb-stub.h>
32
33static volatile int *lasat_int_status;
34static volatile int *lasat_int_mask;
35static volatile int lasat_int_mask_shift;
36
37void disable_lasat_irq(unsigned int irq_nr)
38{
39 *lasat_int_mask &= ~(1 << irq_nr) << lasat_int_mask_shift;
40}
41
42void enable_lasat_irq(unsigned int irq_nr)
43{
44 *lasat_int_mask |= (1 << irq_nr) << lasat_int_mask_shift;
45}
46
47static struct irq_chip lasat_irq_type = {
48 .name = "Lasat",
49 .ack = disable_lasat_irq,
50 .mask = disable_lasat_irq,
51 .mask_ack = disable_lasat_irq,
52 .unmask = enable_lasat_irq,
53};
54
55static inline int ls1bit32(unsigned int x)
56{
57 int b = 31, s;
58
59 s = 16; if (x << 16 == 0) s = 0; b -= s; x <<= s;
60 s = 8; if (x << 8 == 0) s = 0; b -= s; x <<= s;
61 s = 4; if (x << 4 == 0) s = 0; b -= s; x <<= s;
62 s = 2; if (x << 2 == 0) s = 0; b -= s; x <<= s;
63 s = 1; if (x << 1 == 0) s = 0; b -= s;
64
65 return b;
66}
67
68static unsigned long (*get_int_status)(void);
69
70static unsigned long get_int_status_100(void)
71{
72 return *lasat_int_status & *lasat_int_mask;
73}
74
75static unsigned long get_int_status_200(void)
76{
77 unsigned long int_status;
78
79 int_status = *lasat_int_status;
80 int_status &= (int_status >> LASATINT_MASK_SHIFT_200) & 0xffff;
81 return int_status;
82}
83
84asmlinkage void plat_irq_dispatch(void)
85{
86 unsigned long int_status;
87 unsigned int cause = read_c0_cause();
88 int irq;
89
90 if (cause & CAUSEF_IP7) { /* R4000 count / compare IRQ */
91 ll_timer_interrupt(7);
92 return;
93 }
94
95 int_status = get_int_status();
96
97 /* if int_status == 0, then the interrupt has already been cleared */
98 if (int_status) {
99 irq = ls1bit32(int_status);
100
101 do_IRQ(irq);
102 }
103}
104
105void __init arch_init_irq(void)
106{
107 int i;
108
109 switch (mips_machtype) {
110 case MACH_LASAT_100:
111 lasat_int_status = (void *)LASAT_INT_STATUS_REG_100;
112 lasat_int_mask = (void *)LASAT_INT_MASK_REG_100;
113 lasat_int_mask_shift = LASATINT_MASK_SHIFT_100;
114 get_int_status = get_int_status_100;
115 *lasat_int_mask = 0;
116 break;
117 case MACH_LASAT_200:
118 lasat_int_status = (void *)LASAT_INT_STATUS_REG_200;
119 lasat_int_mask = (void *)LASAT_INT_MASK_REG_200;
120 lasat_int_mask_shift = LASATINT_MASK_SHIFT_200;
121 get_int_status = get_int_status_200;
122 *lasat_int_mask &= 0xffff;
123 break;
124 default:
125 panic("arch_init_irq: mips_machtype incorrect");
126 }
127
128 for (i = 0; i <= LASATINT_END; i++)
129 set_irq_chip_and_handler(i, &lasat_irq_type, handle_level_irq);
130}