fix(cpus): workaround for Neoverse V1 errata 2743233

Neoverse V1 erratum 2743233 is a Cat B erratum that applies to
all revisions <= r1p2 and is still open.

The workaround sets CPUACTLR5_EL1[56:55] to 2'b01.

SDEN documentation: https://developer.arm.com/documentation/SDEN1401781/latest

Change-Id: If51a6f4293fa8b5b35c44edd564ebb715ba309a1
Signed-off-by: Sona Mathew <SonaRebecca.Mathew@arm.com>
(cherry picked from commit f1c3eae9e091a63b42eebae8b03d4d470c9c3f75)

4 files changed, 52 insertions, 0 deletions

diff --git a/docs/design/cpu-specific-build-macros.rst b/docs/design/cpu-specific-build-macros.rst
index 0f6277860..8a201862c 100644
--- a/docs/design/cpu-specific-build-macros.rst
+++ b/docs/design/cpu-specific-build-macros.rst
@@ -484,6 +484,10 @@ For Neoverse V1, the following errata build flags are defined :
    CPU. This needs to be enabled for revisions r0p0, r1p0, r1p1 and r1p2 of the
    CPU. It is still open.
 
+-  ``ERRATA_V1_2743233``: This applies erratum 2743233 workaround to Neoverse-V1
+   CPU. This needs to be enabled for revisions r0p0, r1p0, r1p1, and r1p2 of the
+   CPU. It is still open.
+
 -  ``ERRATA_V1_2779461``: This applies erratum 2779461 workaround to Neoverse-V1
    CPU. This needs to be enabled for revisions r0p0, r1p0, r1p1, r1p2 of the
    CPU. It is still open.
diff --git a/include/lib/cpus/aarch64/neoverse_v1.h b/include/lib/cpus/aarch64/neoverse_v1.h
index 4c10484f5..3d486230f 100644
--- a/include/lib/cpus/aarch64/neoverse_v1.h
+++ b/include/lib/cpus/aarch64/neoverse_v1.h
@@ -43,4 +43,6 @@
 
 #define NEOVERSE_V1_ACTLR3_EL1					S3_0_C15_C1_2
 
+#define NEOVERSE_V1_ACTLR5_EL1					S3_0_C15_C9_0
+
 #endif /* NEOVERSE_V1_H */
diff --git a/lib/cpus/aarch64/neoverse_v1.S b/lib/cpus/aarch64/neoverse_v1.S
index f9a578985..363c2e6f2 100644
--- a/lib/cpus/aarch64/neoverse_v1.S
+++ b/lib/cpus/aarch64/neoverse_v1.S
@@ -486,6 +486,37 @@ func check_errata_2743093
 	b	cpu_rev_var_ls
 endfunc check_errata_2743093
 
+	/* ---------------------------------------------------
+	 * Errata Workaround for Neoverse V1 Errata #2743233.
+	 * This applies to revisions r0p0, r1p0, r1p1 and r1p2.
+	 * It is still open.
+	 * x0: variant[4:7] and revisions[0:3] of current cpu.
+	 * Shall clobber: x0-x1, x17
+	 * ---------------------------------------------------
+	 */
+func errata_neoverse_v1_2743233_wa
+	/* Check revision. */
+	mov 	x17, x30
+	bl	check_errata_2743233
+	cbz	x0, 1f
+
+	/* Apply the workaround */
+	mrs	x1, NEOVERSE_V1_ACTLR5_EL1
+	bic	x1, x1, #BIT(56)
+	orr	x1, x1, #BIT(55)
+	msr	NEOVERSE_V1_ACTLR5_EL1, x1
+
+1:
+	ret 	x17
+endfunc errata_neoverse_v1_2743233_wa
+
+func check_errata_2743233
+	/* Applies to r0p0, r1p0, r1p1 and r1p2 */
+	mov	x1, #CPU_REV(1,2)
+	b	cpu_rev_var_ls
+endfunc check_errata_2743233
+
+
 	/* ----------------------------------------------------
  	 * Errata Workaround for Neoverse V1 Errata #2779461.
 	 * This applies to revisions r0p0, r1p0, r1p1, and r1p2.
@@ -573,6 +604,7 @@ func neoverse_v1_errata_report
 	report_errata ERRATA_V1_2294912, neoverse_v1, 2294912
 	report_errata ERRATA_V1_2372203, neoverse_v1, 2372203
 	report_errata ERRATA_V1_2743093, neoverse_v1, 2743093
+	report_errata ERRATA_V1_2743233, neoverse_v1, 2743233
 	report_errata ERRATA_V1_2779461, neoverse_v1, 2779461
 	report_errata WORKAROUND_CVE_2022_23960, neoverse_v1, cve_2022_23960
 
@@ -652,6 +684,11 @@ func neoverse_v1_reset_func
 	bl	errata_neoverse_v1_2372203_wa
 #endif
 
+#if ERRATA_V1_2743233
+	mov	x0, x18
+	bl	errata_neoverse_v1_2743233_wa
+#endif
+
 #if ERRATA_V1_2779461
 	mov	x0, x18
 	bl	errata_neoverse_v1_2779461_wa
diff --git a/lib/cpus/cpu-ops.mk b/lib/cpus/cpu-ops.mk
index 0f10061a1..51b21757d 100644
--- a/lib/cpus/cpu-ops.mk
+++ b/lib/cpus/cpu-ops.mk
@@ -539,6 +539,11 @@ ERRATA_V1_2372203	?=0
 # still open.
 ERRATA_V1_2743093	?=0
 
+# Flag to apply erratum 2743233 workaround during powerdown. This erratum
+# applies to revisions r0p0, r1p0, r1p1 and r1p2 of the Neoverse V1 cpu and is
+# still open.
+ERRATA_V1_2743233	?=0
+
 # Flag to apply erratum 2779461 workaround during powerdown. This erratum
 # applies to revisions r0p0, r1p0, r1p1 and r1p2  of the Neoverse V1 cpu and is
 # still open.
@@ -1229,6 +1234,10 @@ $(eval $(call add_define,ERRATA_V1_2372203))
 $(eval $(call assert_boolean,ERRATA_V1_2743093))
 $(eval $(call add_define,ERRATA_V1_2743093))
 
+# Process ERRATA_V1_2743233 flag
+$(eval $(call assert_boolean,ERRATA_V1_2743233))
+$(eval $(call add_define,ERRATA_V1_2743233))
+
 # Process ERRATA_V1_2779461 flag
 $(eval $(call assert_boolean,ERRATA_V1_2779461))
 $(eval $(call add_define,ERRATA_V1_2779461))