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>
38 static void at91_aic_mask_irq(unsigned int irq
)
40 /* Disable interrupt on AIC */
41 at91_sys_write(AT91_AIC_IDCR
, 1 << irq
);
44 static void at91_aic_unmask_irq(unsigned int irq
)
46 /* Enable interrupt on AIC */
47 at91_sys_write(AT91_AIC_IECR
, 1 << irq
);
50 static int at91_aic_set_type(unsigned irq
, unsigned type
)
52 unsigned int smr
, srctype
;
56 srctype
= AT91_AIC_SRCTYPE_HIGH
;
59 srctype
= AT91_AIC_SRCTYPE_RISING
;
62 if ((irq
> AT91_ID_FIQ
) && (irq
< AT91RM9200_ID_IRQ0
)) /* only supported on external interrupts */
64 srctype
= AT91_AIC_SRCTYPE_LOW
;
67 if ((irq
> AT91_ID_FIQ
) && (irq
< AT91RM9200_ID_IRQ0
)) /* only supported on external interrupts */
69 srctype
= AT91_AIC_SRCTYPE_FALLING
;
75 smr
= at91_sys_read(AT91_AIC_SMR(irq
)) & ~AT91_AIC_SRCTYPE
;
76 at91_sys_write(AT91_AIC_SMR(irq
), smr
| srctype
);
85 static int at91_aic_set_wake(unsigned irq
, unsigned value
)
87 if (unlikely(irq
>= 32))
91 wakeups
|= (1 << irq
);
93 wakeups
&= ~(1 << irq
);
98 void at91_irq_suspend(void)
100 backups
= at91_sys_read(AT91_AIC_IMR
);
101 at91_sys_write(AT91_AIC_IDCR
, backups
);
102 at91_sys_write(AT91_AIC_IECR
, wakeups
);
105 void at91_irq_resume(void)
107 at91_sys_write(AT91_AIC_IDCR
, wakeups
);
108 at91_sys_write(AT91_AIC_IECR
, backups
);
112 #define at91_aic_set_wake NULL
115 static struct irq_chip at91_aic_chip
= {
117 .ack
= at91_aic_mask_irq
,
118 .mask
= at91_aic_mask_irq
,
119 .unmask
= at91_aic_unmask_irq
,
120 .set_type
= at91_aic_set_type
,
121 .set_wake
= at91_aic_set_wake
,
125 * Initialize the AIC interrupt controller.
127 void __init
at91_aic_init(unsigned int priority
[NR_AIC_IRQS
])
132 * The IVR is used by macro get_irqnr_and_base to read and verify.
133 * The irq number is NR_AIC_IRQS when a spurious interrupt has occurred.
135 for (i
= 0; i
< NR_AIC_IRQS
; i
++) {
136 /* Put irq number in Source Vector Register: */
137 at91_sys_write(AT91_AIC_SVR(i
), i
);
138 /* Active Low interrupt, with the specified priority */
139 at91_sys_write(AT91_AIC_SMR(i
), AT91_AIC_SRCTYPE_LOW
| priority
[i
]);
141 set_irq_chip(i
, &at91_aic_chip
);
142 set_irq_handler(i
, handle_level_irq
);
143 set_irq_flags(i
, IRQF_VALID
| IRQF_PROBE
);
145 /* Perform 8 End Of Interrupt Command to make sure AIC will not Lock out nIRQ */
147 at91_sys_write(AT91_AIC_EOICR
, 0);
151 * Spurious Interrupt ID in Spurious Vector Register is NR_AIC_IRQS
152 * When there is no current interrupt, the IRQ Vector Register reads the value stored in AIC_SPU
154 at91_sys_write(AT91_AIC_SPU
, NR_AIC_IRQS
);
156 /* No debugging in AIC: Debug (Protect) Control Register */
157 at91_sys_write(AT91_AIC_DCR
, 0);
159 /* Disable and clear all interrupts initially */
160 at91_sys_write(AT91_AIC_IDCR
, 0xFFFFFFFF);
161 at91_sys_write(AT91_AIC_ICCR
, 0xFFFFFFFF);