1/*
2 * arch/arm/mach-ks8695/irq.c
3 *
4 * Copyright (C) 2006 Ben Dooks <ben@simtec.co.uk>
5 * Copyright (C) 2006 Simtec Electronics
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
20 */
21
22#include <linux/init.h>
23#include <linux/module.h>
24#include <linux/interrupt.h>
25#include <linux/ioport.h>
26#include <linux/device.h>
27#include <linux/io.h>
28
29#include <mach/hardware.h>
30#include <asm/irq.h>
31
32#include <asm/mach/irq.h>
33
34#include <mach/regs-irq.h>
35#include <mach/regs-gpio.h>
36
37static void ks8695_irq_mask(struct irq_data *d)
38{
39	unsigned long inten;
40
41	inten = __raw_readl(KS8695_IRQ_VA + KS8695_INTEN);
42	inten &= ~(1 << d->irq);
43
44	__raw_writel(inten, KS8695_IRQ_VA + KS8695_INTEN);
45}
46
47static void ks8695_irq_unmask(struct irq_data *d)
48{
49	unsigned long inten;
50
51	inten = __raw_readl(KS8695_IRQ_VA + KS8695_INTEN);
52	inten |= (1 << d->irq);
53
54	__raw_writel(inten, KS8695_IRQ_VA + KS8695_INTEN);
55}
56
57static void ks8695_irq_ack(struct irq_data *d)
58{
59	__raw_writel((1 << d->irq), KS8695_IRQ_VA + KS8695_INTST);
60}
61
62
63static struct irq_chip ks8695_irq_level_chip;
64static struct irq_chip ks8695_irq_edge_chip;
65
66
67static int ks8695_irq_set_type(struct irq_data *d, unsigned int type)
68{
69	unsigned long ctrl, mode;
70	unsigned short level_triggered = 0;
71
72	ctrl = __raw_readl(KS8695_GPIO_VA + KS8695_IOPC);
73
74	switch (type) {
75		case IRQ_TYPE_LEVEL_HIGH:
76			mode = IOPC_TM_HIGH;
77			level_triggered = 1;
78			break;
79		case IRQ_TYPE_LEVEL_LOW:
80			mode = IOPC_TM_LOW;
81			level_triggered = 1;
82			break;
83		case IRQ_TYPE_EDGE_RISING:
84			mode = IOPC_TM_RISING;
85			break;
86		case IRQ_TYPE_EDGE_FALLING:
87			mode = IOPC_TM_FALLING;
88			break;
89		case IRQ_TYPE_EDGE_BOTH:
90			mode = IOPC_TM_EDGE;
91			break;
92		default:
93			return -EINVAL;
94	}
95
96	switch (d->irq) {
97		case KS8695_IRQ_EXTERN0:
98			ctrl &= ~IOPC_IOEINT0TM;
99			ctrl |= IOPC_IOEINT0_MODE(mode);
100			break;
101		case KS8695_IRQ_EXTERN1:
102			ctrl &= ~IOPC_IOEINT1TM;
103			ctrl |= IOPC_IOEINT1_MODE(mode);
104			break;
105		case KS8695_IRQ_EXTERN2:
106			ctrl &= ~IOPC_IOEINT2TM;
107			ctrl |= IOPC_IOEINT2_MODE(mode);
108			break;
109		case KS8695_IRQ_EXTERN3:
110			ctrl &= ~IOPC_IOEINT3TM;
111			ctrl |= IOPC_IOEINT3_MODE(mode);
112			break;
113		default:
114			return -EINVAL;
115	}
116
117	if (level_triggered) {
118		irq_set_chip_and_handler(d->irq, &ks8695_irq_level_chip,
119					 handle_level_irq);
120	}
121	else {
122		irq_set_chip_and_handler(d->irq, &ks8695_irq_edge_chip,
123					 handle_edge_irq);
124	}
125
126	__raw_writel(ctrl, KS8695_GPIO_VA + KS8695_IOPC);
127	return 0;
128}
129
130static struct irq_chip ks8695_irq_level_chip = {
131	.irq_ack	= ks8695_irq_mask,
132	.irq_mask	= ks8695_irq_mask,
133	.irq_unmask	= ks8695_irq_unmask,
134	.irq_set_type	= ks8695_irq_set_type,
135};
136
137static struct irq_chip ks8695_irq_edge_chip = {
138	.irq_ack	= ks8695_irq_ack,
139	.irq_mask	= ks8695_irq_mask,
140	.irq_unmask	= ks8695_irq_unmask,
141	.irq_set_type	= ks8695_irq_set_type,
142};
143
144void __init ks8695_init_irq(void)
145{
146	unsigned int irq;
147
148	/* Disable all interrupts initially */
149	__raw_writel(0, KS8695_IRQ_VA + KS8695_INTMC);
150	__raw_writel(0, KS8695_IRQ_VA + KS8695_INTEN);
151
152	for (irq = 0; irq < NR_IRQS; irq++) {
153		switch (irq) {
154			/* Level-triggered interrupts */
155			case KS8695_IRQ_BUS_ERROR:
156			case KS8695_IRQ_UART_MODEM_STATUS:
157			case KS8695_IRQ_UART_LINE_STATUS:
158			case KS8695_IRQ_UART_RX:
159			case KS8695_IRQ_COMM_TX:
160			case KS8695_IRQ_COMM_RX:
161				irq_set_chip_and_handler(irq,
162							 &ks8695_irq_level_chip,
163							 handle_level_irq);
164				break;
165
166			/* Edge-triggered interrupts */
167			default:
168				/* clear pending bit */
169				ks8695_irq_ack(irq_get_irq_data(irq));
170				irq_set_chip_and_handler(irq,
171							 &ks8695_irq_edge_chip,
172							 handle_edge_irq);
173		}
174
175		irq_clear_status_flags(irq, IRQ_NOREQUEST);
176	}
177}
178