fix(cpus): workaround for Neoverse V2 erratum 2331132
Neoverse V2 erratum 2331132 is a Cat B erratum that applies to all
revisions <= r0p2 and is still open. The workaround is to write the
value 4'b1001 to the PF_MODE bits in the IMP_CPUECTLR2_EL1 register
which will place the data prefetcher in the most conservative mode
instead of disabling it.
SDEN documentation:
https://developer.arm.com/documentation/SDEN2332927/latest
Signed-off-by: Bipin Ravi <bipin.ravi@arm.com>
Change-Id: Ic6c76375df465a4ad2e20dd7add7037477d973c1
diff --git a/include/lib/cpus/aarch64/neoverse_v2.h b/include/lib/cpus/aarch64/neoverse_v2.h
index efb960e..321faf9 100644
--- a/include/lib/cpus/aarch64/neoverse_v2.h
+++ b/include/lib/cpus/aarch64/neoverse_v2.h
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2021-2022, Arm Limited. All rights reserved.
+ * Copyright (c) 2021-2023, Arm Limited. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@@ -23,4 +23,12 @@
#define NEOVERSE_V2_CPUPWRCTLR_EL1 S3_0_C15_C2_7
#define NEOVERSE_V2_CPUPWRCTLR_EL1_CORE_PWRDN_BIT U(1)
+/*******************************************************************************
+ * CPU Extended Control register 2 specific definitions.
+ ******************************************************************************/
+#define NEOVERSE_V2_CPUECTLR2_EL1 S3_0_C15_C1_5
+#define NEOVERSE_V2_CPUECTLR2_EL1_PF_MODE_CNSRV ULL(9)
+#define NEOVERSE_V2_CPUECTLR2_EL1_PF_MODE_LSB U(11)
+#define NEOVERSE_V2_CPUECTLR2_EL1_PF_MODE_WIDTH U(4)
+
#endif /* NEOVERSE_V2_H */