MIPS: CM: Introduce core-other locking functions

[cascardo/linux.git] / arch / mips / include / asm / mips-cm.h

diff --git a/arch/mips/include/asm/mips-cm.h b/arch/mips/include/asm/mips-cm.h
index 7740c4f..6516e9d 100644 (file)
--- a/arch/mips/include/asm/mips-cm.h
+++ b/arch/mips/include/asm/mips-cm.h
@@ -364,6 +364,10 @@ BUILD_CM_Cx_R_(tcid_8_priority,    0x80)
 /* GCR_Cx_OTHER register fields */
 #define CM_GCR_Cx_OTHER_CORENUM_SHF            16
 #define CM_GCR_Cx_OTHER_CORENUM_MSK            (_ULCAST_(0xffff) << 16)
+#define CM3_GCR_Cx_OTHER_CORE_SHF              8
+#define CM3_GCR_Cx_OTHER_CORE_MSK              (_ULCAST_(0x3f) << 8)
+#define CM3_GCR_Cx_OTHER_VP_SHF                        0
+#define CM3_GCR_Cx_OTHER_VP_MSK                        (_ULCAST_(0x7) << 0)
 
 /* GCR_Cx_RESET_BASE register fields */
 #define CM_GCR_Cx_RESET_BASE_BEVEXCBASE_SHF    12
@@ -474,4 +478,32 @@ static inline unsigned int mips_cm_vp_id(unsigned int cpu)
        return (core * mips_cm_max_vp_width()) + vp;
 }
 
+#ifdef CONFIG_MIPS_CM
+
+/**
+ * mips_cm_lock_other - lock access to another core
+ * @core: the other core to be accessed
+ * @vp: the VP within the other core to be accessed
+ *
+ * Call before operating upon a core via the 'other' register region in
+ * order to prevent the region being moved during access. Must be followed
+ * by a call to mips_cm_unlock_other.
+ */
+extern void mips_cm_lock_other(unsigned int core, unsigned int vp);
+
+/**
+ * mips_cm_unlock_other - unlock access to another core
+ *
+ * Call after operating upon another core via the 'other' register region.
+ * Must be called after mips_cm_lock_other.
+ */
+extern void mips_cm_unlock_other(void);
+
+#else /* !CONFIG_MIPS_CM */
+
+static inline void mips_cm_lock_other(unsigned int core) { }
+static inline void mips_cm_unlock_other(void) { }
+
+#endif /* !CONFIG_MIPS_CM */
+
 #endif /* __MIPS_ASM_MIPS_CM_H__ */