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