Merge branch 'drm-patches' of master.kernel.org:/pub/scm/linux/kernel/git/airlied...
[linux-2.6] / arch / frv / kernel / irq-mb93493.c
1 /* irq-mb93493.c: MB93493 companion chip interrupt handler
2  *
3  * Copyright (C) 2006 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/ptrace.h>
13 #include <linux/errno.h>
14 #include <linux/signal.h>
15 #include <linux/sched.h>
16 #include <linux/ioport.h>
17 #include <linux/interrupt.h>
18 #include <linux/init.h>
19 #include <linux/irq.h>
20
21 #include <asm/io.h>
22 #include <asm/system.h>
23 #include <asm/bitops.h>
24 #include <asm/delay.h>
25 #include <asm/irq.h>
26 #include <asm/irc-regs.h>
27 #include <asm/mb93493-irqs.h>
28 #include <asm/mb93493-regs.h>
29
30 #define IRQ_ROUTE_ONE(X) (X##_ROUTE << (X - IRQ_BASE_MB93493))
31
32 #define IRQ_ROUTING                                     \
33         (IRQ_ROUTE_ONE(IRQ_MB93493_VDC)         |       \
34          IRQ_ROUTE_ONE(IRQ_MB93493_VCC)         |       \
35          IRQ_ROUTE_ONE(IRQ_MB93493_AUDIO_OUT)   |       \
36          IRQ_ROUTE_ONE(IRQ_MB93493_I2C_0)       |       \
37          IRQ_ROUTE_ONE(IRQ_MB93493_I2C_1)       |       \
38          IRQ_ROUTE_ONE(IRQ_MB93493_USB)         |       \
39          IRQ_ROUTE_ONE(IRQ_MB93493_LOCAL_BUS)   |       \
40          IRQ_ROUTE_ONE(IRQ_MB93493_PCMCIA)      |       \
41          IRQ_ROUTE_ONE(IRQ_MB93493_GPIO)        |       \
42          IRQ_ROUTE_ONE(IRQ_MB93493_AUDIO_IN))
43
44 /*
45  * daughter board PIC operations
46  * - there is no way to ACK interrupts in the MB93493 chip
47  */
48 static void frv_mb93493_mask(unsigned int irq)
49 {
50         uint32_t iqsr;
51         volatile void *piqsr;
52
53         if (IRQ_ROUTING & (1 << (irq - IRQ_BASE_MB93493)))
54                 piqsr = __addr_MB93493_IQSR(1);
55         else
56                 piqsr = __addr_MB93493_IQSR(0);
57
58         iqsr = readl(piqsr);
59         iqsr &= ~(1 << (irq - IRQ_BASE_MB93493 + 16));
60         writel(iqsr, piqsr);
61 }
62
63 static void frv_mb93493_ack(unsigned int irq)
64 {
65 }
66
67 static void frv_mb93493_unmask(unsigned int irq)
68 {
69         uint32_t iqsr;
70         volatile void *piqsr;
71
72         if (IRQ_ROUTING & (1 << (irq - IRQ_BASE_MB93493)))
73                 piqsr = __addr_MB93493_IQSR(1);
74         else
75                 piqsr = __addr_MB93493_IQSR(0);
76
77         iqsr = readl(piqsr);
78         iqsr |= 1 << (irq - IRQ_BASE_MB93493 + 16);
79         writel(iqsr, piqsr);
80 }
81
82 static struct irq_chip frv_mb93493_pic = {
83         .name           = "mb93093",
84         .ack            = frv_mb93493_ack,
85         .mask           = frv_mb93493_mask,
86         .mask_ack       = frv_mb93493_mask,
87         .unmask         = frv_mb93493_unmask,
88 };
89
90 /*
91  * MB93493 PIC interrupt handler
92  */
93 static irqreturn_t mb93493_interrupt(int irq, void *_piqsr)
94 {
95         volatile void *piqsr = _piqsr;
96         uint32_t iqsr;
97
98         iqsr = readl(piqsr);
99         iqsr = iqsr & (iqsr >> 16) & 0xffff;
100
101         /* poll all the triggered IRQs */
102         while (iqsr) {
103                 int irq;
104
105                 asm("scan %1,gr0,%0" : "=r"(irq) : "r"(iqsr));
106                 irq = 31 - irq;
107                 iqsr &= ~(1 << irq);
108
109                 generic_handle_irq(IRQ_BASE_MB93493 + irq);
110         }
111
112         return IRQ_HANDLED;
113 }
114
115 /*
116  * define an interrupt action for each MB93493 PIC output
117  * - use dev_id to indicate the MB93493 PIC input to output mappings
118  */
119 static struct irqaction mb93493_irq[2]  = {
120         [0] = {
121                 .handler        = mb93493_interrupt,
122                 .flags          = IRQF_DISABLED | IRQF_SHARED,
123                 .mask           = CPU_MASK_NONE,
124                 .name           = "mb93493.0",
125                 .dev_id         = (void *) __addr_MB93493_IQSR(0),
126         },
127         [1] = {
128                 .handler        = mb93493_interrupt,
129                 .flags          = IRQF_DISABLED | IRQF_SHARED,
130                 .mask           = CPU_MASK_NONE,
131                 .name           = "mb93493.1",
132                 .dev_id         = (void *) __addr_MB93493_IQSR(1),
133         }
134 };
135
136 /*
137  * initialise the motherboard MB93493's PIC
138  */
139 void __init mb93493_init(void)
140 {
141         int irq;
142
143         for (irq = IRQ_BASE_MB93493 + 0; irq <= IRQ_BASE_MB93493 + 10; irq++)
144                 set_irq_chip_and_handler(irq, &frv_mb93493_pic, handle_edge_irq);
145
146         /* the MB93493 drives external IRQ inputs on the CPU PIC */
147         setup_irq(IRQ_CPU_MB93493_0, &mb93493_irq[0]);
148         setup_irq(IRQ_CPU_MB93493_1, &mb93493_irq[1]);
149 }