summaryrefslogtreecommitdiffstats
path: root/arch/frv/kernel/irq-mb93493.c
blob: 7754c7338e4b42cfaeb4c3a76158665f3b05d275 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
/* irq-mb93493.c: MB93493 companion chip interrupt handler
 *
 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <linux/ptrace.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/bitops.h>

#include <asm/io.h>
#include <asm/system.h>
#include <asm/delay.h>
#include <asm/irq.h>
#include <asm/irc-regs.h>
#include <asm/mb93493-irqs.h>
#include <asm/mb93493-regs.h>

#define IRQ_ROUTE_ONE(X) (X##_ROUTE << (X - IRQ_BASE_MB93493))

#define IRQ_ROUTING					\
	(IRQ_ROUTE_ONE(IRQ_MB93493_VDC)		|	\
	 IRQ_ROUTE_ONE(IRQ_MB93493_VCC)		|	\
	 IRQ_ROUTE_ONE(IRQ_MB93493_AUDIO_OUT)	|	\
	 IRQ_ROUTE_ONE(IRQ_MB93493_I2C_0)	|	\
	 IRQ_ROUTE_ONE(IRQ_MB93493_I2C_1)	|	\
	 IRQ_ROUTE_ONE(IRQ_MB93493_USB)		|	\
	 IRQ_ROUTE_ONE(IRQ_MB93493_LOCAL_BUS)	|	\
	 IRQ_ROUTE_ONE(IRQ_MB93493_PCMCIA)	|	\
	 IRQ_ROUTE_ONE(IRQ_MB93493_GPIO)	|	\
	 IRQ_ROUTE_ONE(IRQ_MB93493_AUDIO_IN))

/*
 * daughter board PIC operations
 * - there is no way to ACK interrupts in the MB93493 chip
 */
static void frv_mb93493_mask(unsigned int irq)
{
	uint32_t iqsr;
	volatile void *piqsr;

	if (IRQ_ROUTING & (1 << (irq - IRQ_BASE_MB93493)))
		piqsr = __addr_MB93493_IQSR(1);
	else
		piqsr = __addr_MB93493_IQSR(0);

	iqsr = readl(piqsr);
	iqsr &= ~(1 << (irq - IRQ_BASE_MB93493 + 16));
	writel(iqsr, piqsr);
}

static void frv_mb93493_ack(unsigned int irq)
{
}

static void frv_mb93493_unmask(unsigned int irq)
{
	uint32_t iqsr;
	volatile void *piqsr;

	if (IRQ_ROUTING & (1 << (irq - IRQ_BASE_MB93493)))
		piqsr = __addr_MB93493_IQSR(1);
	else
		piqsr = __addr_MB93493_IQSR(0);

	iqsr = readl(piqsr);
	iqsr |= 1 << (irq - IRQ_BASE_MB93493 + 16);
	writel(iqsr, piqsr);
}

static struct irq_chip frv_mb93493_pic = {
	.name		= "mb93093",
	.ack		= frv_mb93493_ack,
	.mask		= frv_mb93493_mask,
	.mask_ack	= frv_mb93493_mask,
	.unmask		= frv_mb93493_unmask,
};

/*
 * MB93493 PIC interrupt handler
 */
static irqreturn_t mb93493_interrupt(int irq, void *_piqsr)
{
	volatile void *piqsr = _piqsr;
	uint32_t iqsr;

	iqsr = readl(piqsr);
	iqsr = iqsr & (iqsr >> 16) & 0xffff;

	/* poll all the triggered IRQs */
	while (iqsr) {
		int irq;

		asm("scan %1,gr0,%0" : "=r"(irq) : "r"(iqsr));
		irq = 31 - irq;
		iqsr &= ~(1 << irq);

		generic_handle_irq(IRQ_BASE_MB93493 + irq);
	}

	return IRQ_HANDLED;
}

/*
 * define an interrupt action for each MB93493 PIC output
 * - use dev_id to indicate the MB93493 PIC input to output mappings
 */
static struct irqaction mb93493_irq[2]  = {
	[0] = {
		.handler	= mb93493_interrupt,
		.flags		= IRQF_DISABLED | IRQF_SHARED,
		.mask		= CPU_MASK_NONE,
		.name		= "mb93493.0",
		.dev_id		= (void *) __addr_MB93493_IQSR(0),
	},
	[1] = {
		.handler	= mb93493_interrupt,
		.flags		= IRQF_DISABLED | IRQF_SHARED,
		.mask		= CPU_MASK_NONE,
		.name		= "mb93493.1",
		.dev_id		= (void *) __addr_MB93493_IQSR(1),
	}
};

/*
 * initialise the motherboard MB93493's PIC
 */
void __init mb93493_init(void)
{
	int irq;

	for (irq = IRQ_BASE_MB93493 + 0; irq <= IRQ_BASE_MB93493 + 10; irq++)
		set_irq_chip_and_handler(irq, &frv_mb93493_pic, handle_edge_irq);

	/* the MB93493 drives external IRQ inputs on the CPU PIC */
	setup_irq(IRQ_CPU_MB93493_0, &mb93493_irq[0]);
	setup_irq(IRQ_CPU_MB93493_1, &mb93493_irq[1]);
}
OpenPOWER on IntegriCloud