errata: workaround for Neoverse V1 errata 1774420
Neoverse V1 erratum 1774420 is a Cat B erratum present in r0p0 and
r1p0 of the V1 processor core. It is fixed in r1p1.
SDEN can be found here:
https://documentation-service.arm.com/static/60d499080320e92fa40b4625
Signed-off-by: Lauren Wehrmeister <lauren.wehrmeister@arm.com>
Change-Id: I66e27b2518f73faeedd8615a1443a74b6a30f123
diff --git a/lib/cpus/aarch64/neoverse_v1.S b/lib/cpus/aarch64/neoverse_v1.S
index cee0bb7..62b92b2 100644
--- a/lib/cpus/aarch64/neoverse_v1.S
+++ b/lib/cpus/aarch64/neoverse_v1.S
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2019-2020, ARM Limited. All rights reserved.
+ * Copyright (c) 2019-2021, ARM Limited. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@@ -22,6 +22,34 @@
#endif
/* --------------------------------------------------
+ * Errata Workaround for Neoverse V1 Errata #1774420.
+ * This applies to revisions r0p0 and r1p0, fixed in r1p1.
+ * x0: variant[4:7] and revision[0:3] of current cpu.
+ * Shall clobber: x0-x17
+ * --------------------------------------------------
+ */
+func errata_neoverse_v1_1774420_wa
+ /* Check workaround compatibility. */
+ mov x17, x30
+ bl check_errata_1774420
+ cbz x0, 1f
+
+ /* Set bit 53 in CPUECTLR_EL1 */
+ mrs x1, NEOVERSE_V1_CPUECTLR_EL1
+ orr x1, x1, #NEOVERSE_V1_CPUECTLR_EL1_BIT_53
+ msr NEOVERSE_V1_CPUECTLR_EL1, x1
+ isb
+1:
+ ret x17
+endfunc errata_neoverse_v1_1774420_wa
+
+func check_errata_1774420
+ /* Applies to r0p0 and r1p0. */
+ mov x1, #0x10
+ b cpu_rev_var_ls
+endfunc check_errata_1774420
+
+ /* --------------------------------------------------
* Errata Workaround for Neoverse V1 Errata #1791573.
* This applies to revisions r0p0 and r1p0, fixed in r1p1.
* x0: variant[4:7] and revision[0:3] of current cpu.
@@ -35,9 +63,9 @@
cbz x0, 1f
/* Set bit 2 in ACTLR2_EL1 */
- mrs x1, NEOVERSE_V1_ACTLR2_EL1
+ mrs x1, NEOVERSE_V1_ACTLR2_EL1
orr x1, x1, #NEOVERSE_V1_ACTLR2_EL1_BIT_2
- msr NEOVERSE_V1_ACTLR2_EL1, x1
+ msr NEOVERSE_V1_ACTLR2_EL1, x1
isb
1:
ret x17
@@ -134,6 +162,7 @@
* Report all errata. The revision-variant information is passed to
* checking functions of each errata.
*/
+ report_errata ERRATA_V1_1774420, neoverse_v1, 1774420
report_errata ERRATA_V1_1791573, neoverse_v1, 1791573
report_errata ERRATA_V1_1940577, neoverse_v1, 1940577
@@ -149,6 +178,11 @@
msr SSBS, xzr
isb
+#if ERRATA_V1_1774420
+ mov x0, x18
+ bl errata_neoverse_v1_1774420_wa
+#endif
+
#if ERRATA_V1_1791573
mov x0, x18
bl errata_neoverse_v1_1791573_wa
diff --git a/lib/cpus/cpu-ops.mk b/lib/cpus/cpu-ops.mk
index 6f80d2d..3de0139 100644
--- a/lib/cpus/cpu-ops.mk
+++ b/lib/cpus/cpu-ops.mk
@@ -372,6 +372,10 @@
# exists in revisions r0p0, r1p0, and r2p0 as well but there is no workaround.
ERRATA_N1_1946160 ?=0
+# Flag to apply erratum 1774420 workaround during reset. This erratum applies
+# to revisions r0p0 and r1p0 of the Neoverse V1 core, and was fixed in r1p1.
+ERRATA_V1_1774420 ?=0
+
# Flag to apply erratum 1791573 workaround during reset. This erratum applies
# to revisions r0p0 and r1p0 of the Neoverse V1 core, and was fixed in r1p1.
ERRATA_V1_1791573 ?=0
@@ -685,6 +689,10 @@
$(eval $(call assert_boolean,ERRATA_N1_1946160))
$(eval $(call add_define,ERRATA_N1_1946160))
+# Process ERRATA_V1_1774420 flag
+$(eval $(call assert_boolean,ERRATA_V1_1774420))
+$(eval $(call add_define,ERRATA_V1_1774420))
+
# Process ERRATA_V1_1791573 flag
$(eval $(call assert_boolean,ERRATA_V1_1791573))
$(eval $(call add_define,ERRATA_V1_1791573))