diff options
| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-01-16 13:31:47 +0400 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-02-09 19:34:14 +0400 |
| commit | 6ad1b614007c556129989b9f6b020d0d2e058121 (patch) | |
| tree | d146b694cad7d3134b3166f56f401b203e073811 /arch/arm | |
| parent | 710455201f6690841e9a40bedba09ddd0a7e0620 (diff) | |
| download | linux-6ad1b614007c556129989b9f6b020d0d2e058121.tar.xz | |
ARM: sa11x0: neponset: provide function to manipulate NCR_0
Rather than having direct register accesses to NCR_0 scattered amongst
the code, provide a function instead. This contains the necessary
race protection for this platform, ensuring that updates to this
register are safe.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/mach-sa1100/include/mach/neponset.h | 4 | ||||
| -rw-r--r-- | arch/arm/mach-sa1100/neponset.c | 9 |
2 files changed, 13 insertions, 0 deletions
diff --git a/arch/arm/mach-sa1100/include/mach/neponset.h b/arch/arm/mach-sa1100/include/mach/neponset.h index ffe2bc45eed0..6032216e1830 100644 --- a/arch/arm/mach-sa1100/include/mach/neponset.h +++ b/arch/arm/mach-sa1100/include/mach/neponset.h @@ -71,4 +71,8 @@ #define NCR_A0VPP (1<<5) #define NCR_A1VPP (1<<6) +void neponset_ncr_frob(unsigned int, unsigned int); +#define neponset_ncr_set(v) neponset_ncr_frob(0, v) +#define neponset_ncr_clear(v) neponset_ncr_frob(v, 0) + #endif diff --git a/arch/arm/mach-sa1100/neponset.c b/arch/arm/mach-sa1100/neponset.c index 6a14d3760ccd..10be07e2bd56 100644 --- a/arch/arm/mach-sa1100/neponset.c +++ b/arch/arm/mach-sa1100/neponset.c @@ -20,6 +20,15 @@ #include <asm/hardware/sa1111.h> #include <asm/sizes.h> +void neponset_ncr_frob(unsigned int mask, unsigned int val) +{ + unsigned long flags; + + local_irq_save(flags); + NCR_0 = (NCR_0 & ~mask) | val; + local_irq_restore(flags); +} + /* * Install handler for Neponset IRQ. Note that we have to loop here * since the ETHERNET and USAR IRQs are level based, and we need to |