blob: 76802aac0f459fe3867fbecbbc3eb9aab84bd9c3 [file] [log] [blame]
Andrew Victorc53c9cf2007-05-11 21:01:28 +01001/*
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>
Kay Sieversedbaa602011-12-21 16:26:03 -080026#include <linux/device.h>
Russell Kingfced80c2008-09-06 12:10:45 +010027#include <linux/io.h>
Andrew Victorc53c9cf2007-05-11 21:01:28 +010028
Russell Kinga09e64f2008-08-05 16:14:15 +010029#include <mach/hardware.h>
Andrew Victorc53c9cf2007-05-11 21:01:28 +010030#include <asm/irq.h>
Andrew Victorc53c9cf2007-05-11 21:01:28 +010031
32#include <asm/mach/irq.h>
33
Russell Kinga09e64f2008-08-05 16:14:15 +010034#include <mach/regs-irq.h>
35#include <mach/regs-gpio.h>
Andrew Victorc53c9cf2007-05-11 21:01:28 +010036
Lennert Buytenhek3cdb7912010-11-29 10:34:14 +010037static void ks8695_irq_mask(struct irq_data *d)
Andrew Victorc53c9cf2007-05-11 21:01:28 +010038{
39 unsigned long inten;
40
41 inten = __raw_readl(KS8695_IRQ_VA + KS8695_INTEN);
Lennert Buytenhek3cdb7912010-11-29 10:34:14 +010042 inten &= ~(1 << d->irq);
Andrew Victorc53c9cf2007-05-11 21:01:28 +010043
44 __raw_writel(inten, KS8695_IRQ_VA + KS8695_INTEN);
45}
46
Lennert Buytenhek3cdb7912010-11-29 10:34:14 +010047static void ks8695_irq_unmask(struct irq_data *d)
Andrew Victorc53c9cf2007-05-11 21:01:28 +010048{
49 unsigned long inten;
50
51 inten = __raw_readl(KS8695_IRQ_VA + KS8695_INTEN);
Lennert Buytenhek3cdb7912010-11-29 10:34:14 +010052 inten |= (1 << d->irq);
Andrew Victorc53c9cf2007-05-11 21:01:28 +010053
54 __raw_writel(inten, KS8695_IRQ_VA + KS8695_INTEN);
55}
56
Lennert Buytenhek3cdb7912010-11-29 10:34:14 +010057static void ks8695_irq_ack(struct irq_data *d)
Andrew Victorc53c9cf2007-05-11 21:01:28 +010058{
Lennert Buytenhek3cdb7912010-11-29 10:34:14 +010059 __raw_writel((1 << d->irq), KS8695_IRQ_VA + KS8695_INTST);
Andrew Victorc53c9cf2007-05-11 21:01:28 +010060}
61
62
63static struct irq_chip ks8695_irq_level_chip;
64static struct irq_chip ks8695_irq_edge_chip;
65
66
Lennert Buytenhek3cdb7912010-11-29 10:34:14 +010067static int ks8695_irq_set_type(struct irq_data *d, unsigned int type)
Andrew Victorc53c9cf2007-05-11 21:01:28 +010068{
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) {
Dmitry Baryshkov6cab4862008-07-27 04:23:31 +010075 case IRQ_TYPE_LEVEL_HIGH:
Andrew Victorc53c9cf2007-05-11 21:01:28 +010076 mode = IOPC_TM_HIGH;
77 level_triggered = 1;
78 break;
Dmitry Baryshkov6cab4862008-07-27 04:23:31 +010079 case IRQ_TYPE_LEVEL_LOW:
Andrew Victorc53c9cf2007-05-11 21:01:28 +010080 mode = IOPC_TM_LOW;
81 level_triggered = 1;
82 break;
Dmitry Baryshkov6cab4862008-07-27 04:23:31 +010083 case IRQ_TYPE_EDGE_RISING:
Andrew Victorc53c9cf2007-05-11 21:01:28 +010084 mode = IOPC_TM_RISING;
85 break;
Dmitry Baryshkov6cab4862008-07-27 04:23:31 +010086 case IRQ_TYPE_EDGE_FALLING:
Andrew Victorc53c9cf2007-05-11 21:01:28 +010087 mode = IOPC_TM_FALLING;
88 break;
Dmitry Baryshkov6cab4862008-07-27 04:23:31 +010089 case IRQ_TYPE_EDGE_BOTH:
Andrew Victorc53c9cf2007-05-11 21:01:28 +010090 mode = IOPC_TM_EDGE;
91 break;
92 default:
93 return -EINVAL;
94 }
95
Lennert Buytenhek3cdb7912010-11-29 10:34:14 +010096 switch (d->irq) {
Andrew Victorc53c9cf2007-05-11 21:01:28 +010097 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) {
Thomas Gleixnerf38c02f2011-03-24 13:35:09 +0100118 irq_set_chip_and_handler(d->irq, &ks8695_irq_level_chip,
119 handle_level_irq);
Andrew Victorc53c9cf2007-05-11 21:01:28 +0100120 }
121 else {
Thomas Gleixnerf38c02f2011-03-24 13:35:09 +0100122 irq_set_chip_and_handler(d->irq, &ks8695_irq_edge_chip,
123 handle_edge_irq);
Andrew Victorc53c9cf2007-05-11 21:01:28 +0100124 }
125
126 __raw_writel(ctrl, KS8695_GPIO_VA + KS8695_IOPC);
127 return 0;
128}
129
130static struct irq_chip ks8695_irq_level_chip = {
Lennert Buytenhek3cdb7912010-11-29 10:34:14 +0100131 .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,
Andrew Victorc53c9cf2007-05-11 21:01:28 +0100135};
136
137static struct irq_chip ks8695_irq_edge_chip = {
Lennert Buytenhek3cdb7912010-11-29 10:34:14 +0100138 .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,
Andrew Victorc53c9cf2007-05-11 21:01:28 +0100142};
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:
Thomas Gleixnerf38c02f2011-03-24 13:35:09 +0100161 irq_set_chip_and_handler(irq,
162 &ks8695_irq_level_chip,
163 handle_level_irq);
Andrew Victorc53c9cf2007-05-11 21:01:28 +0100164 break;
165
166 /* Edge-triggered interrupts */
167 default:
Lennert Buytenhek3cdb7912010-11-29 10:34:14 +0100168 /* clear pending bit */
169 ks8695_irq_ack(irq_get_irq_data(irq));
Thomas Gleixnerf38c02f2011-03-24 13:35:09 +0100170 irq_set_chip_and_handler(irq,
171 &ks8695_irq_edge_chip,
172 handle_edge_irq);
Andrew Victorc53c9cf2007-05-11 21:01:28 +0100173 }
174
175 set_irq_flags(irq, IRQF_VALID);
176 }
177}