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| author | Ben Dooks <ben@simtec.co.uk> | 2009-08-03 17:26:57 +0100 |
|---|---|---|
| committer | Ben Dooks <ben-linux@fluff.org> | 2009-08-14 01:13:28 +0100 |
| commit | 229fd8ffba57dfaea59078b9144371369ffdb0a3 (patch) | |
| tree | 4332e1d442d7db803574154d5443d2016d442347 /arch | |
| parent | 9b71de49b030ad8fd4d13d38571b5c42dc9ed8dd (diff) | |
| download | linux-229fd8ffba57dfaea59078b9144371369ffdb0a3.tar.gz linux-229fd8ffba57dfaea59078b9144371369ffdb0a3.tar.bz2 linux-229fd8ffba57dfaea59078b9144371369ffdb0a3.zip | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/plat-s3c24xx/include/plat/fiq.h | 13 | ||||
| -rw-r--r-- | arch/arm/plat-s3c24xx/irq.c | 36 |
2 files changed, 49 insertions, 0 deletions
diff --git a/arch/arm/plat-s3c24xx/include/plat/fiq.h b/arch/arm/plat-s3c24xx/include/plat/fiq.h new file mode 100644 index 000000000000..8521b8372c5f --- /dev/null +++ b/arch/arm/plat-s3c24xx/include/plat/fiq.h @@ -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); diff --git a/arch/arm/plat-s3c24xx/irq.c b/arch/arm/plat-s3c24xx/irq.c index 958737775ad2..d02f5f02045e 100644 --- a/arch/arm/plat-s3c24xx/irq.c +++ b/arch/arm/plat-s3c24xx/irq.c @@ -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... */ |