fix(cpus): workaround for Cortex-A510 erratum 2684597
Cortex-A510 erratum 2684597 is a Cat B erratum that applies to revisions
r0p0, r0p1, r0p2, r0p3, r1p0, r1p1 and r1p2. It is fixed in r1p3. The
workaround is to execute a TSB CSYNC and DSB before executing WFI for
power down.
SDEN can be found here:
https://developer.arm.com/documentation/SDEN1873361/latest
https://developer.arm.com/documentation/SDEN1873351/latest
Change-Id: Ic0b24b600bc013eb59c797401fbdc9bda8058d6d
Signed-off-by: Harrison Mutai <harrison.mutai@arm.com>
diff --git a/lib/cpus/aarch64/runtime_errata.S b/lib/cpus/aarch64/runtime_errata.S
new file mode 100644
index 0000000..8d46691
--- /dev/null
+++ b/lib/cpus/aarch64/runtime_errata.S
@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2023, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <asm_macros.S>
+#include <cortex_a510.h>
+#include <cpu_macros.S>
+
+/*
+ * void apply_cpu_pwr_dwn_errata(void);
+ *
+ * This function applies various CPU errata during power down.
+ */
+ .globl apply_cpu_pwr_dwn_errata
+func apply_cpu_pwr_dwn_errata
+ mov x19, x30
+ bl cpu_get_rev_var
+ mov x18, x0
+
+#if ERRATA_A510_2684597
+ bl errata_cortex_a510_2684597_wa
+#endif
+
+ ret x19
+endfunc apply_cpu_pwr_dwn_errata