fix(cpus): workaround for Cortex-A78C erratum 2683027
Cortex-A78C erratum 2683027 is a cat B erratum that applies to
revisions r0p1 - r0p2 and is still open. The workaround is to
execute a specific code sequence in EL3 during reset.
SDEN can be found here:
https://developer.arm.com/documentation/SDEN-2004089/latest
Change-Id: I2bf9e675f48b62b4cd203100f7df40f4846aafa8
Signed-off-by: Bipin Ravi <bipin.ravi@arm.com>
diff --git a/lib/cpus/aarch64/cortex_a78c.S b/lib/cpus/aarch64/cortex_a78c.S
index 2e6e8b6..0dc34f7 100644
--- a/lib/cpus/aarch64/cortex_a78c.S
+++ b/lib/cpus/aarch64/cortex_a78c.S
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2021-2023, Arm Limited. All rights reserved.
+ * Copyright (c) 2021-2024, Arm Limited. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@@ -72,6 +72,19 @@
check_erratum_range cortex_a78c, ERRATUM(2395411), CPU_REV(0, 1), CPU_REV(0, 2)
+workaround_reset_start cortex_a78c, ERRATUM(2683027), ERRATA_A78C_2683027
+ ldr x0, =0x3
+ msr CORTEX_A78C_IMP_CPUPSELR_EL3, x0
+ ldr x0, =0xEE010F10
+ msr CORTEX_A78C_IMP_CPUPOR_EL3, x0
+ ldr x0, =0xFF1F0FFE
+ msr CORTEX_A78C_IMP_CPUPMR_EL3, x0
+ ldr x0, =0x100000004003FF
+ msr CORTEX_A78C_IMP_CPUPCR_EL3, x0
+workaround_reset_end cortex_a78c, ERRATUM(2683027)
+
+check_erratum_range cortex_a78c, ERRATUM(2683027), CPU_REV(0, 1), CPU_REV(0, 2)
+
workaround_reset_start cortex_a78c, ERRATUM(2743232), ERRATA_A78C_2743232
/* Set CPUACTLR5_EL1[56:55] to 2'b01 */
sysreg_bit_set CORTEX_A78C_ACTLR5_EL1, BIT(55)
diff --git a/lib/cpus/cpu-ops.mk b/lib/cpus/cpu-ops.mk
index f83fe19..a99c082 100644
--- a/lib/cpus/cpu-ops.mk
+++ b/lib/cpus/cpu-ops.mk
@@ -388,6 +388,10 @@
# to revisions r0p1 and r0p2 of the A78C cpu. It is still open.
CPU_FLAG_LIST += ERRATA_A78C_2395411
+# Flag to apply erratum 2683027 workaround during reset. This erratum applies
+# to revisions r0p1 and r0p2 of the A78C cpu. It is still open.
+CPU_FLAG_LIST += ERRATA_A78C_2683027
+
# Flag to apply erratum 2712575 workaround for non-arm interconnect ip. This
# erratum applies to revisions r0p1 and r0p2 of the A78C cpu.
# It is still open.