blob: a56c15026965ef06f859eac8844af98d6b48a8e0 [file] [log] [blame]
Brian Murphy1f21d2b2007-08-21 22:34:16 +02001/*
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>
Brian Murphy1f21d2b2007-08-21 22:34:16 +020022#include <linux/interrupt.h>
Yoichi Yuasa89becf52007-11-09 18:42:35 +090023#include <linux/irq.h>
Brian Murphy1f21d2b2007-08-21 22:34:16 +020024
25#include <asm/bootinfo.h>
Ralf Baechlea5ccfe52007-10-14 23:49:33 +010026#include <asm/irq_cpu.h>
Brian Murphy1f21d2b2007-08-21 22:34:16 +020027#include <asm/lasat/lasatint.h>
Yoichi Yuasa89becf52007-11-09 18:42:35 +090028
29#include <irq.h>
Brian Murphy1f21d2b2007-08-21 22:34:16 +020030
31static volatile int *lasat_int_status;
32static volatile int *lasat_int_mask;
33static volatile int lasat_int_mask_shift;
34
35void disable_lasat_irq(unsigned int irq_nr)
36{
Thomas Horsten0c3bd832008-06-14 02:32:42 +010037 irq_nr -= LASAT_IRQ_BASE;
Brian Murphy1f21d2b2007-08-21 22:34:16 +020038 *lasat_int_mask &= ~(1 << irq_nr) << lasat_int_mask_shift;
39}
40
41void enable_lasat_irq(unsigned int irq_nr)
42{
Thomas Horsten0c3bd832008-06-14 02:32:42 +010043 irq_nr -= LASAT_IRQ_BASE;
Brian Murphy1f21d2b2007-08-21 22:34:16 +020044 *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 */
Ralf Baechlea5ccfe52007-10-14 23:49:33 +010091 do_IRQ(7);
Brian Murphy1f21d2b2007-08-21 22:34:16 +020092 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) {
Yoichi Yuasa89becf52007-11-09 18:42:35 +090099 irq = LASAT_IRQ_BASE + ls1bit32(int_status);
Brian Murphy1f21d2b2007-08-21 22:34:16 +0200100
101 do_IRQ(irq);
102 }
103}
104
Yoichi Yuasa89becf52007-11-09 18:42:35 +0900105static struct irqaction cascade = {
106 .handler = no_action,
107 .mask = CPU_MASK_NONE,
108 .name = "cascade",
109};
110
Brian Murphy1f21d2b2007-08-21 22:34:16 +0200111void __init arch_init_irq(void)
112{
113 int i;
114
115 switch (mips_machtype) {
116 case MACH_LASAT_100:
117 lasat_int_status = (void *)LASAT_INT_STATUS_REG_100;
118 lasat_int_mask = (void *)LASAT_INT_MASK_REG_100;
119 lasat_int_mask_shift = LASATINT_MASK_SHIFT_100;
120 get_int_status = get_int_status_100;
121 *lasat_int_mask = 0;
122 break;
123 case MACH_LASAT_200:
124 lasat_int_status = (void *)LASAT_INT_STATUS_REG_200;
125 lasat_int_mask = (void *)LASAT_INT_MASK_REG_200;
126 lasat_int_mask_shift = LASATINT_MASK_SHIFT_200;
127 get_int_status = get_int_status_200;
128 *lasat_int_mask &= 0xffff;
129 break;
130 default:
131 panic("arch_init_irq: mips_machtype incorrect");
132 }
133
Ralf Baechlea5ccfe52007-10-14 23:49:33 +0100134 mips_cpu_irq_init();
Yoichi Yuasa89becf52007-11-09 18:42:35 +0900135
136 for (i = LASAT_IRQ_BASE; i <= LASAT_IRQ_END; i++)
Brian Murphy1f21d2b2007-08-21 22:34:16 +0200137 set_irq_chip_and_handler(i, &lasat_irq_type, handle_level_irq);
Yoichi Yuasa89becf52007-11-09 18:42:35 +0900138
139 setup_irq(LASAT_CASCADE_IRQ, &cascade);
Brian Murphy1f21d2b2007-08-21 22:34:16 +0200140}