diff options
| author | Krzysztof Halasa <khc@pm.waw.pl> | 2007-12-18 03:53:27 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2008-02-04 13:15:25 +0000 |
| commit | c18f65816ef80b67eb4511ed8359c2dfcd69680d (patch) | |
| tree | 4802b4316796b8dbee051d2a36064e221249f8df /include/asm-arm/arch-ixp4xx/cpu.h | |
| parent | a9a424ce9a209155f3d4b9f8ceba50cdebb7769b (diff) | |
[ARM] 4712/2: Adds functions to read and write IXP4xx "feature" bits
Adds functions to read and write IXP4xx "feature" (aka "fuse")
bits, containing information about available/enabled CPU features.
The uncompress.h included by boot/compressed/misc.c resides in
a different space than rest of the kernel and thus can't use
asm/hardware.h (including asm/arch/cpu.h - which, in turn, may use
EXPORTed symbol "processor_id").
Posted to linux-arm-kernel on 2 Dec 2007 and revised.
Signed-off-by: Krzysztof Halasa <khc@pm.waw.pl>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'include/asm-arm/arch-ixp4xx/cpu.h')
| -rw-r--r-- | include/asm-arm/arch-ixp4xx/cpu.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/asm-arm/arch-ixp4xx/cpu.h b/include/asm-arm/arch-ixp4xx/cpu.h index d2523b326c6..2fa3d6b8dbb 100644 --- a/include/asm-arm/arch-ixp4xx/cpu.h +++ b/include/asm-arm/arch-ixp4xx/cpu.h @@ -28,4 +28,19 @@ extern unsigned int processor_id; #define cpu_is_ixp46x() ((processor_id & IXP4XX_PROCESSOR_ID_MASK) == \ IXP465_PROCESSOR_ID_VALUE) +static inline u32 ixp4xx_read_feature_bits(void) +{ + unsigned int val = ~*IXP4XX_EXP_CFG2; + val &= ~IXP4XX_FEATURE_RESERVED; + if (!cpu_is_ixp46x()) + val &= ~IXP4XX_FEATURE_IXP46X_ONLY; + + return val; +} + +static inline void ixp4xx_write_feature_bits(u32 value) +{ + *IXP4XX_EXP_CFG2 = ~value; +} + #endif /* _ASM_ARCH_CPU_H */ |