fix(cpus): workaround for Neoverse N2 erratum 2743014
Neoverse N2 erratum 2743014 is a Cat B erratum that applies to
all revisions <=r0p2 and is fixed in r0p3. The workaround is to
set CPUACTLR5_EL1[56:55] to 2'b01.
SDEN documentation:
https://developer.arm.com/documentation/SDEN1982442/latest
Signed-off-by: Arvind Ram Prakash <arvind.ramprakash@arm.com>
Change-Id: Ie7e1be5dea9d1f74738f9fed0fb58bfd41763192
diff --git a/lib/cpus/aarch64/neoverse_n2.S b/lib/cpus/aarch64/neoverse_n2.S
index 44331a5..e981ef7 100644
--- a/lib/cpus/aarch64/neoverse_n2.S
+++ b/lib/cpus/aarch64/neoverse_n2.S
@@ -166,6 +166,14 @@
check_erratum_ls neoverse_n2, ERRATUM(2388450), CPU_REV(0, 0)
+workaround_reset_start neoverse_n2, ERRATUM(2743014), ERRATA_N2_2743014
+ /* Set CPUACTLR5_EL1[56:55] to 2'b01 */
+ sysreg_bit_set NEOVERSE_N2_CPUACTLR5_EL1, NEOVERSE_N2_CPUACTLR5_EL1_BIT_55
+ sysreg_bit_clear NEOVERSE_N2_CPUACTLR5_EL1, NEOVERSE_N2_CPUACTLR5_EL1_BIT_56
+workaround_reset_end neoverse_n2, ERRATUM(2743014)
+
+check_erratum_ls neoverse_n2, ERRATUM(2743014), CPU_REV(0, 2)
+
workaround_runtime_start neoverse_n2, ERRATUM(2743089), ERRATA_N2_2743089
/* dsb before isb of power down sequence */
dsb sy
diff --git a/lib/cpus/cpu-ops.mk b/lib/cpus/cpu-ops.mk
index 175f88d..ce369e2 100644
--- a/lib/cpus/cpu-ops.mk
+++ b/lib/cpus/cpu-ops.mk
@@ -668,6 +668,10 @@
# r0p3.
CPU_FLAG_LIST += ERRATA_N2_2728475
+# Flag to apply erratum 2743014 workaround during reset. This erratum applies
+# to r0p0, r0p1, r0p2 of the Neoverse N2 cpu, it is fixed in r0p3.
+CPU_FLAG_LIST += ERRATA_N2_2743014
+
# Flag to apply erratum 2743089 workaround during during powerdown. This erratum
# applies to all revisions <= r0p2 of the Neoverse N2 cpu, it is fixed in r0p3.
CPU_FLAG_LIST += ERRATA_N2_2743089