2 * linux/arch/arm/mach-at91rm9200/irq.c
4 * Copyright (C) 2004 SAN People
5 * Copyright (C) 2004 ATMEL
6 * Copyright (C) Rick Bronson
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #include <linux/init.h>
24 #include <linux/module.h>
26 #include <linux/types.h>
28 #include <asm/hardware.h>
30 #include <asm/mach-types.h>
31 #include <asm/setup.h>
33 #include <asm/mach/arch.h>
34 #include <asm/mach/irq.h>
35 #include <asm/mach/map.h>
40 * The default interrupt priority levels (0 = lowest, 7 = highest).
42 static unsigned int at91rm9200_default_irq_priority[NR_AIC_IRQS] __initdata = {
43 7, /* Advanced Interrupt Controller */
44 7, /* System Peripheral */
45 0, /* Parallel IO Controller A */
46 0, /* Parallel IO Controller B */
47 0, /* Parallel IO Controller C */
48 0, /* Parallel IO Controller D */
53 0, /* Multimedia Card Interface */
54 4, /* USB Device Port */
55 0, /* Two-Wire Interface */
56 6, /* Serial Peripheral Interface */
57 5, /* Serial Synchronous Controller */
58 5, /* Serial Synchronous Controller */
59 5, /* Serial Synchronous Controller */
60 0, /* Timer Counter 0 */
61 0, /* Timer Counter 1 */
62 0, /* Timer Counter 2 */
63 0, /* Timer Counter 3 */
64 0, /* Timer Counter 4 */
65 0, /* Timer Counter 5 */
66 3, /* USB Host port */
68 0, /* Advanced Interrupt Controller */
69 0, /* Advanced Interrupt Controller */
70 0, /* Advanced Interrupt Controller */
71 0, /* Advanced Interrupt Controller */
72 0, /* Advanced Interrupt Controller */
73 0, /* Advanced Interrupt Controller */
74 0 /* Advanced Interrupt Controller */
78 static void at91rm9200_mask_irq(unsigned int irq)
80 /* Disable interrupt on AIC */
81 at91_sys_write(AT91_AIC_IDCR, 1 << irq);
84 static void at91rm9200_unmask_irq(unsigned int irq)
86 /* Enable interrupt on AIC */
87 at91_sys_write(AT91_AIC_IECR, 1 << irq);
90 static int at91rm9200_irq_type(unsigned irq, unsigned type)
92 unsigned int smr, srctype;
96 srctype = AT91_AIC_SRCTYPE_HIGH;
99 srctype = AT91_AIC_SRCTYPE_RISING;
102 if ((irq > AT91_ID_FIQ) && (irq < AT91_ID_IRQ0)) /* only supported on external interrupts */
104 srctype = AT91_AIC_SRCTYPE_LOW;
107 if ((irq > AT91_ID_FIQ) && (irq < AT91_ID_IRQ0)) /* only supported on external interrupts */
109 srctype = AT91_AIC_SRCTYPE_FALLING;
115 smr = at91_sys_read(AT91_AIC_SMR(irq)) & ~AT91_AIC_SRCTYPE;
116 at91_sys_write(AT91_AIC_SMR(irq), smr | srctype);
125 static int at91rm9200_irq_set_wake(unsigned irq, unsigned value)
127 if (unlikely(irq >= 32))
131 wakeups |= (1 << irq);
133 wakeups &= ~(1 << irq);
138 void at91_irq_suspend(void)
140 backups = at91_sys_read(AT91_AIC_IMR);
141 at91_sys_write(AT91_AIC_IDCR, backups);
142 at91_sys_write(AT91_AIC_IECR, wakeups);
145 void at91_irq_resume(void)
147 at91_sys_write(AT91_AIC_IDCR, wakeups);
148 at91_sys_write(AT91_AIC_IECR, backups);
152 #define at91rm9200_irq_set_wake NULL
155 static struct irqchip at91rm9200_irq_chip = {
156 .ack = at91rm9200_mask_irq,
157 .mask = at91rm9200_mask_irq,
158 .unmask = at91rm9200_unmask_irq,
159 .set_type = at91rm9200_irq_type,
160 .set_wake = at91rm9200_irq_set_wake,
164 * Initialize the AIC interrupt controller.
166 void __init at91rm9200_init_irq(unsigned int priority[NR_AIC_IRQS])
170 /* No priority list specified for this board -> use defaults */
171 if (priority == NULL)
172 priority = at91rm9200_default_irq_priority;
175 * The IVR is used by macro get_irqnr_and_base to read and verify.
176 * The irq number is NR_AIC_IRQS when a spurious interrupt has occurred.
178 for (i = 0; i < NR_AIC_IRQS; i++) {
179 /* Put irq number in Source Vector Register: */
180 at91_sys_write(AT91_AIC_SVR(i), i);
181 /* Store the Source Mode Register as defined in table above */
182 at91_sys_write(AT91_AIC_SMR(i), AT91_AIC_SRCTYPE_LOW | priority[i]);
184 set_irq_chip(i, &at91rm9200_irq_chip);
185 set_irq_handler(i, do_level_IRQ);
186 set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
188 /* Perform 8 End Of Interrupt Command to make sure AIC will not Lock out nIRQ */
190 at91_sys_write(AT91_AIC_EOICR, 0);
194 * Spurious Interrupt ID in Spurious Vector Register is NR_AIC_IRQS
195 * When there is no current interrupt, the IRQ Vector Register reads the value stored in AIC_SPU
197 at91_sys_write(AT91_AIC_SPU, NR_AIC_IRQS);
199 /* No debugging in AIC: Debug (Protect) Control Register */
200 at91_sys_write(AT91_AIC_DCR, 0);
202 /* Disable and clear all interrupts initially */
203 at91_sys_write(AT91_AIC_IDCR, 0xFFFFFFFF);
204 at91_sys_write(AT91_AIC_ICCR, 0xFFFFFFFF);