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[POWERPC] 4xx: Add dcri_clrset() for locked read/modify/write functionality 

This adds dcri_clrset() macro which does read/modify/write
on indirect dcr registers while holding indirect dcr lock.

Signed-off-by: Valentine Barshak <vbarshak@ru.mvista.com>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
This commit is contained in:
Valentine Barshak 2008-03-06 05:38:04 +11:00 committed by Josh Boyer
parent d0a48c9f4c
commit 266d028acb
1 changed files with 17 additions and 0 deletions
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17
include/asm-powerpc/dcr-native.h
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@ -82,6 +82,19 @@ static inline void __mtdcri(int base_addr, int base_data, int reg,
spin_unlock_irqrestore(&dcr_ind_lock, flags);
}
static inline void __dcri_clrset(int base_addr, int base_data, int reg,
unsigned clr, unsigned set)
{
unsigned long flags;
unsigned int val;
spin_lock_irqsave(&dcr_ind_lock, flags);
__mtdcr(base_addr, reg);
val = (__mfdcr(base_data) & ~clr) | set;
__mtdcr(base_data, val);
spin_unlock_irqrestore(&dcr_ind_lock, flags);
}
#define mfdcri(base, reg) __mfdcri(DCRN_ ## base ## _CONFIG_ADDR, \
DCRN_ ## base ## _CONFIG_DATA, \
reg)
@ -90,6 +103,10 @@ static inline void __mtdcri(int base_addr, int base_data, int reg,
DCRN_ ## base ## _CONFIG_DATA, \
reg, data)
#define dcri_clrset(base, reg, clr, set) __dcri_clrset(DCRN_ ## base ## _CONFIG_ADDR, \
DCRN_ ## base ## _CONFIG_DATA, \
reg, clr, set)
#endif /* __ASSEMBLY__ */
#endif /* __KERNEL__ */
#endif /* _ASM_POWERPC_DCR_NATIVE_H */