[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>

1 files changed, 17 insertions, 0 deletions

diff --git a/include/asm-powerpc/dcr-native.h b/include/asm-powerpc/dcr-native.h
index be6c879e876..f8398ce8037 100644
--- a/include/asm-powerpc/dcr-native.h
+++ b/include/asm-powerpc/dcr-native.h
@@ -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 */