fix(errata): workaround for Cortex A78 erratum 2242635
Cortex A78 erratum 2242635 is a Cat B erratum present in the A78 Core.
It applies to revisions r1p0, r1p1, r1p2, and is still open. The issue
is also present in r0p0 but there is no workaround for this revision.
SDEN can be found here:
https://developer.arm.com/documentation/SDEN1401784
Signed-off-by: John Powell <john.powell@arm.com>
Change-Id: Ieca024254cabbc683ff13a70f3aeb8f2f3c5ce07
diff --git a/lib/cpus/aarch64/cortex_a78.S b/lib/cpus/aarch64/cortex_a78.S
index 4e8a228..a1288ba 100644
--- a/lib/cpus/aarch64/cortex_a78.S
+++ b/lib/cpus/aarch64/cortex_a78.S
@@ -227,6 +227,42 @@
b cpu_rev_var_ls
endfunc check_errata_2132060
+/* --------------------------------------------------------------------
+ * Errata Workaround for A78 Erratum 2242635.
+ * This applies to revisions r1p0, r1p1, and r1p2 of the Cortex A78
+ * processor and is still open.
+ * The issue also exists in r0p0 but there is no fix in that revision.
+ * x0: variant[4:7] and revision[0:3] of current cpu.
+ * Shall clobber: x0-x17
+ * --------------------------------------------------------------------
+ */
+func errata_a78_2242635_wa
+ /* Compare x0 against revisions r1p0 - r1p2 */
+ mov x17, x30
+ bl check_errata_2242635
+ cbz x0, 1f
+
+ ldr x0, =0x5
+ msr S3_6_c15_c8_0, x0 /* CPUPSELR_EL3 */
+ ldr x0, =0x10F600E000
+ msr S3_6_c15_c8_2, x0 /* CPUPOR_EL3 */
+ ldr x0, =0x10FF80E000
+ msr S3_6_c15_c8_3, x0 /* CPUPMR_EL3 */
+ ldr x0, =0x80000000003FF
+ msr S3_6_c15_c8_1, x0 /* CPUPCR_EL3 */
+
+ isb
+1:
+ ret x17
+endfunc errata_a78_2242635_wa
+
+func check_errata_2242635
+ /* Applies to revisions r1p0 through r1p2. */
+ mov x1, #CPU_REV(1, 0)
+ mov x2, #CPU_REV(1, 2)
+ b cpu_rev_var_range
+endfunc check_errata_2242635
+
/* -------------------------------------------------
* The CPU Ops reset function for Cortex-A78
* -------------------------------------------------
@@ -266,6 +302,11 @@
bl errata_a78_2132060_wa
#endif
+#if ERRATA_A78_2242635
+ mov x0, x18
+ bl errata_a78_2242635_wa
+#endif
+
#if ENABLE_AMU
/* Make sure accesses from EL0/EL1 and EL2 are not trapped to EL3 */
mrs x0, actlr_el3
@@ -326,6 +367,7 @@
report_errata ERRATA_A78_1821534, cortex_a78, 1821534
report_errata ERRATA_A78_1952683, cortex_a78, 1952683
report_errata ERRATA_A78_2132060, cortex_a78, 2132060
+ report_errata ERRATA_A78_2242635, cortex_a78, 2242635
ldp x8, x30, [sp], #16
ret
diff --git a/lib/cpus/cpu-ops.mk b/lib/cpus/cpu-ops.mk
index cdb978b..6a514ef 100644
--- a/lib/cpus/cpu-ops.mk
+++ b/lib/cpus/cpu-ops.mk
@@ -311,25 +311,30 @@
# well but there is no workaround for that revision.
ERRATA_A78_1951500 ?=0
-# Flag to apply erratum 1941500 workaround during reset. This erratum applies
-# to revisions r0p0 and r0p1 of the A78 AE cpu. It is still open.
-ERRATA_A78_AE_1941500 ?=0
-
-# Flag to apply erratum 1951502 workaround during reset. This erratum applies
-# to revisions r0p0 and r0p1 of the A78 AE cpu. It is still open.
-ERRATA_A78_AE_1951502 ?=0
-
# Flag to apply erratum 1821534 workaround during reset. This erratum applies
# to revisions r0p0 and r1p0 of the A78 cpu.
ERRATA_A78_1821534 ?=0
# Flag to apply erratum 1952683 workaround during reset. This erratum applies
# to revision r0p0 of the A78 cpu and was fixed in the revision r1p0.
-ERRATA_A78_1952683 ?=0
+ERRATA_A78_1952683 ?=0
# Flag to apply erratum 2132060 workaround during reset. This erratum applies
# to revisions r0p0, r1p0, r1p1, and r1p2 of the A78 cpu. It is still open.
-ERRATA_A78_2132060 ?=0
+ERRATA_A78_2132060 ?=0
+
+# Flag to apply erratum 2242635 workaround during reset. This erratum applies
+# to revisions r1p0, r1p1, and r1p2 of the A78 cpu and is open. The issue is
+# present in r0p0 as well but there is no workaround for that revision.
+ERRATA_A78_2242635 ?=0
+
+# Flag to apply erratum 1941500 workaround during reset. This erratum applies
+# to revisions r0p0 and r0p1 of the A78 AE cpu. It is still open.
+ERRATA_A78_AE_1941500 ?=0
+
+# Flag to apply erratum 1951502 workaround during reset. This erratum applies
+# to revisions r0p0 and r0p1 of the A78 AE cpu. It is still open.
+ERRATA_A78_AE_1951502 ?=0
# Flag to apply T32 CLREX workaround during reset. This erratum applies
# only to r0p0 and r1p0 of the Neoverse N1 cpu.
@@ -730,14 +735,6 @@
$(eval $(call assert_boolean,ERRATA_A78_1951500))
$(eval $(call add_define,ERRATA_A78_1951500))
-# Process ERRATA_A78_AE_1941500 flag
-$(eval $(call assert_boolean,ERRATA_A78_AE_1941500))
-$(eval $(call add_define,ERRATA_A78_AE_1941500))
-
-# Process ERRATA_A78_AE_1951502 flag
-$(eval $(call assert_boolean,ERRATA_A78_AE_1951502))
-$(eval $(call add_define,ERRATA_A78_AE_1951502))
-
# Process ERRATA_A78_1821534 flag
$(eval $(call assert_boolean,ERRATA_A78_1821534))
$(eval $(call add_define,ERRATA_A78_1821534))
@@ -750,6 +747,18 @@
$(eval $(call assert_boolean,ERRATA_A78_2132060))
$(eval $(call add_define,ERRATA_A78_2132060))
+# Process ERRATA_A78_2242635 flag
+$(eval $(call assert_boolean,ERRATA_A78_2242635))
+$(eval $(call add_define,ERRATA_A78_2242635))
+
+# Process ERRATA_A78_AE_1941500 flag
+$(eval $(call assert_boolean,ERRATA_A78_AE_1941500))
+$(eval $(call add_define,ERRATA_A78_AE_1941500))
+
+# Process ERRATA_A78_AE_1951502 flag
+$(eval $(call assert_boolean,ERRATA_A78_AE_1951502))
+$(eval $(call add_define,ERRATA_A78_AE_1951502))
+
# Process ERRATA_N1_1043202 flag
$(eval $(call assert_boolean,ERRATA_N1_1043202))
$(eval $(call add_define,ERRATA_N1_1043202))