ARM: 7684/1: errata: Workaround for Cortex-A15 erratum 798181 (TLBI/DSB operations)

[karo-tx-linux.git] / arch / arm / include / asm / tlbflush.h

diff --git a/arch/arm/include/asm/tlbflush.h b/arch/arm/include/asm/tlbflush.h
index 4db8c8820f0d1c832bf9efd5e81a69d32b4fc7d7..9e9c041358ca8789e4a6798aaf871007795e8fb9 100644 (file)
--- a/arch/arm/include/asm/tlbflush.h
+++ b/arch/arm/include/asm/tlbflush.h
@@ -450,6 +450,21 @@ static inline void local_flush_bp_all(void)
                isb();
 }
 
+#ifdef CONFIG_ARM_ERRATA_798181
+static inline void dummy_flush_tlb_a15_erratum(void)
+{
+       /*
+        * Dummy TLBIMVAIS. Using the unmapped address 0 and ASID 0.
+        */
+       asm("mcr p15, 0, %0, c8, c3, 1" : : "r" (0));
+       dsb();
+}
+#else
+static inline void dummy_flush_tlb_a15_erratum(void)
+{
+}
+#endif
+
 /*
  *     flush_pmd_entry
  *