Linux-2.6.12-rc2
[linux-2.6.git] / arch / frv / kernel / irq-mb93493.c
1 /* irq-mb93493.c: MB93493 companion chip interrupt handler
2  *
3  * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
4  * Written by David Howells (dhowells@redhat.com)
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License
8  * as published by the Free Software Foundation; either version
9  * 2 of the License, or (at your option) any later version.
10  */
11
12 #include <linux/config.h>
13 #include <linux/ptrace.h>
14 #include <linux/errno.h>
15 #include <linux/signal.h>
16 #include <linux/sched.h>
17 #include <linux/ioport.h>
18 #include <linux/interrupt.h>
19 #include <linux/init.h>
20 #include <linux/irq.h>
21
22 #include <asm/io.h>
23 #include <asm/system.h>
24 #include <asm/bitops.h>
25 #include <asm/delay.h>
26 #include <asm/irq.h>
27 #include <asm/irc-regs.h>
28 #include <asm/irq-routing.h>
29 #include <asm/mb93493-irqs.h>
30
31 static void frv_mb93493_doirq(struct irq_source *source);
32
33 /*****************************************************************************/
34 /*
35  * MB93493 companion chip IRQ multiplexor
36  */
37 static struct irq_source frv_mb93493[2] = {
38         [0] = {
39                 .muxname                = "mb93493.0",
40                 .muxdata                = __region_CS3 + 0x3d0,
41                 .doirq                  = frv_mb93493_doirq,
42                 .irqmask                = 0x0000,
43         },
44         [1] = {
45                 .muxname                = "mb93493.1",
46                 .muxdata                = __region_CS3 + 0x3d4,
47                 .doirq                  = frv_mb93493_doirq,
48                 .irqmask                = 0x0000,
49         },
50 };
51
52 static void frv_mb93493_control(struct irq_group *group, int index, int on)
53 {
54         struct irq_source *source;
55         uint32_t iqsr;
56
57         if ((frv_mb93493[0].irqmask & (1 << index)))
58                 source = &frv_mb93493[0];
59         else
60                 source = &frv_mb93493[1];
61
62         iqsr = readl(source->muxdata);
63         if (on)
64                 iqsr |= 1 << (index + 16);
65         else
66                 iqsr &= ~(1 << (index + 16));
67
68         writel(iqsr, source->muxdata);
69 }
70
71 static struct irq_group frv_mb93493_irqs = {
72         .first_irq      = IRQ_BASE_MB93493,
73         .control        = frv_mb93493_control,
74 };
75
76 static void frv_mb93493_doirq(struct irq_source *source)
77 {
78         uint32_t mask = readl(source->muxdata);
79         mask = mask & (mask >> 16) & 0xffff;
80
81         if (mask)
82                 distribute_irqs(&frv_mb93493_irqs, mask);
83 }
84
85 static void __init mb93493_irq_route(int irq, int source)
86 {
87         frv_mb93493[source].irqmask |= 1 << (irq - IRQ_BASE_MB93493);
88         frv_mb93493_irqs.sources[irq - IRQ_BASE_MB93493] = &frv_mb93493[source];
89 }
90
91 void __init route_mb93493_irqs(void)
92 {
93         frv_irq_route_external(&frv_mb93493[0], IRQ_CPU_MB93493_0);
94         frv_irq_route_external(&frv_mb93493[1], IRQ_CPU_MB93493_1);
95
96         frv_irq_set_group(&frv_mb93493_irqs);
97
98         mb93493_irq_route(IRQ_MB93493_VDC,              IRQ_MB93493_VDC_ROUTE);
99         mb93493_irq_route(IRQ_MB93493_VCC,              IRQ_MB93493_VCC_ROUTE);
100         mb93493_irq_route(IRQ_MB93493_AUDIO_IN,         IRQ_MB93493_AUDIO_IN_ROUTE);
101         mb93493_irq_route(IRQ_MB93493_I2C_0,            IRQ_MB93493_I2C_0_ROUTE);
102         mb93493_irq_route(IRQ_MB93493_I2C_1,            IRQ_MB93493_I2C_1_ROUTE);
103         mb93493_irq_route(IRQ_MB93493_USB,              IRQ_MB93493_USB_ROUTE);
104         mb93493_irq_route(IRQ_MB93493_LOCAL_BUS,        IRQ_MB93493_LOCAL_BUS_ROUTE);
105         mb93493_irq_route(IRQ_MB93493_PCMCIA,           IRQ_MB93493_PCMCIA_ROUTE);
106         mb93493_irq_route(IRQ_MB93493_GPIO,             IRQ_MB93493_GPIO_ROUTE);
107         mb93493_irq_route(IRQ_MB93493_AUDIO_OUT,        IRQ_MB93493_AUDIO_OUT_ROUTE);
108 }