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Commit 266d028a authored by Valentine Barshak's avatar Valentine Barshak Committed by Josh Boyer
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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: default avatarValentine Barshak <vbarshak@ru.mvista.com>
Acked-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: default avatarJosh Boyer <jwboyer@linux.vnet.ibm.com>
parent d0a48c9f

include/asm-powerpc/dcr-native.h

+17 −0
Original line number Diff line number Diff line
@@ -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 */