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Commit 229fd8ff authored by Ben Dooks's avatar Ben Dooks Committed by Ben Dooks
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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: default avatarBen Dooks <ben-linux@fluff.org>
parent 9b71de49

arch/arm/plat-s3c24xx/include/plat/fiq.h

0 → 100644
+13 −0
Original line number Diff line number Diff line 
/* 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);

arch/arm/plat-s3c24xx/irq.c

+36 −0
Original line number Diff line number Diff line
@@ -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... */