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ARM: S3C24XX: Add FIQ IRQ routing support 

Add support for routing an IRQ from the normal ARM IRQ mechanism to the
FIQ input of the processor.

Note, also fix a bug where the init_FIQ() function has not been called
when CONFIG_FIQ is enabled.

Signed-off-by; Ben Dooks <ben@simtec.co.uk>

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
This commit is contained in:
Ben Dooks 2009-08-03 17:26:57 +01:00 committed by Ben Dooks
parent 9b71de49b0
commit 229fd8ffba
2 changed files with 49 additions and 0 deletions
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13
arch/arm/plat-s3c24xx/include/plat/fiq.h Normal file
View File

@ -0,0 +1,13 @@
/* linux/include/asm-arm/plat-s3c24xx/fiq.h
*
* Copyright (c) 2009 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
*
* Header file for S3C24XX CPU FIQ support
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
extern int s3c24xx_set_fiq(unsigned int irq, bool on);

36
arch/arm/plat-s3c24xx/irq.c
View File

@ -493,6 +493,38 @@ s3c_irq_demux_extint4t7(unsigned int irq,
}
}
#ifdef CONFIG_FIQ
/**
* s3c24xx_set_fiq - set the FIQ routing
* @irq: IRQ number to route to FIQ on processor.
* @on: Whether to route @irq to the FIQ, or to remove the FIQ routing.
*
* Change the state of the IRQ to FIQ routing depending on @irq and @on. If
* @on is true, the @irq is checked to see if it can be routed and the
* interrupt controller updated to route the IRQ. If @on is false, the FIQ
* routing is cleared, regardless of which @irq is specified.
*/
int s3c24xx_set_fiq(unsigned int irq, bool on)
{
u32 intmod;
unsigned offs;
if (on) {
offs = irq - FIQ_START;
if (offs > 31)
return -EINVAL;
intmod = 1 << offs;
} else {
intmod = 0;
}
__raw_writel(intmod, S3C2410_INTMOD);
return 0;
}
#endif
/* s3c24xx_init_irq
*
* Initialise S3C2410 IRQ system
@ -505,6 +537,10 @@ void __init s3c24xx_init_irq(void)
int irqno;
int i;
#ifdef CONFIG_FIQ
init_FIQ();
#endif
irqdbf("s3c2410_init_irq: clearing interrupt status flags\n");
/* first, clear all interrupts pending... */