aboutsummaryrefslogtreecommitdiffstats
path: root/arch/mips/emma2rh/common/irq_emma2rh.c
blob: 197ed4c2ba04d774dff5b10b3e89571c418680c6 (plain) (blame)
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
/*
 *  arch/mips/emma2rh/common/irq_emma2rh.c
 *      This file defines the irq handler for EMMA2RH.
 *
 *  Copyright (C) NEC Electronics Corporation 2005-2006
 *
 *  This file is based on the arch/mips/ddb5xxx/ddb5477/irq_5477.c
 *
 *	Copyright 2001 MontaVista Software Inc.
 *
 *  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.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

/*
 * EMMA2RH defines 64 IRQs.
 *
 * This file exports one function:
 *	emma2rh_irq_init(u32 irq_base);
 */

#include <linux/interrupt.h>
#include <linux/types.h>
#include <linux/ptrace.h>

#include <asm/debug.h>

#include <asm/emma2rh/emma2rh.h>

/* number of total irqs supported by EMMA2RH */
#define	NUM_EMMA2RH_IRQ		96

static int emma2rh_irq_base = -1;

void ll_emma2rh_irq_enable(int);
void ll_emma2rh_irq_disable(int);

static void emma2rh_irq_enable(unsigned int irq)
{
	ll_emma2rh_irq_enable(irq - emma2rh_irq_base);
}

static void emma2rh_irq_disable(unsigned int irq)
{
	ll_emma2rh_irq_disable(irq - emma2rh_irq_base);
}

static unsigned int emma2rh_irq_startup(unsigned int irq)
{
	emma2rh_irq_enable(irq);
	return 0;
}

#define	emma2rh_irq_shutdown	emma2rh_irq_disable

static void emma2rh_irq_ack(unsigned int irq)
{
	/* disable interrupt - some handler will re-enable the irq
	 * and if the interrupt is leveled, we will have infinite loop
	 */
	ll_emma2rh_irq_disable(irq - emma2rh_irq_base);
}

static void emma2rh_irq_end(unsigned int irq)
{
	if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
		ll_emma2rh_irq_enable(irq - emma2rh_irq_base);
}

struct irq_chip emma2rh_irq_controller = {
	.typename = "emma2rh_irq",
	.startup = emma2rh_irq_startup,
	.shutdown = emma2rh_irq_shutdown,
	.enable = emma2rh_irq_enable,
	.disable = emma2rh_irq_disable,
	.ack = emma2rh_irq_ack,
	.end = emma2rh_irq_end,
	.set_affinity = NULL	/* no affinity stuff for UP */
};

void emma2rh_irq_init(u32 irq_base)
{
	u32 i;

	for (i = irq_base; i < irq_base + NUM_EMMA2RH_IRQ; i++) {
		irq_desc[i].status = IRQ_DISABLED;
		irq_desc[i].action = NULL;
		irq_desc[i].depth = 1;
		irq_desc[i].chip = &emma2rh_irq_controller;
	}

	emma2rh_irq_base = irq_base;
}

void ll_emma2rh_irq_enable(int emma2rh_irq)
{
	u32 reg_value;
	u32 reg_bitmask;
	u32 reg_index;

	reg_index = EMMA2RH_BHIF_INT_EN_0
	    + (EMMA2RH_BHIF_INT_EN_1 - EMMA2RH_BHIF_INT_EN_0)
	    * (emma2rh_irq / 32);
	reg_value = emma2rh_in32(reg_index);
	reg_bitmask = 0x1 << (emma2rh_irq % 32);
	db_assert((reg_value & reg_bitmask) == 0);
	emma2rh_out32(reg_index, reg_value | reg_bitmask);
}

void ll_emma2rh_irq_disable(int emma2rh_irq)
{
	u32 reg_value;
	u32 reg_bitmask;
	u32 reg_index;

	reg_index = EMMA2RH_BHIF_INT_EN_0
	    + (EMMA2RH_BHIF_INT_EN_1 - EMMA2RH_BHIF_INT_EN_0)
	    * (emma2rh_irq / 32);
	reg_value = emma2rh_in32(reg_index);
	reg_bitmask = 0x1 << (emma2rh_irq % 32);
	db_assert((reg_value & reg_bitmask) != 0);
	emma2rh_out32(reg_index, reg_value & ~reg_bitmask);
}