errata: workaround for Cortex-A78 errata 1952683
Cortex-A78 erratum 1952683 is a Cat B erratum present in r0p0 of
the Cortex-A78 processor core, and it was fixed in r1p0.
A78 SDEN : https://developer.arm.com/documentation/SDEN1401784/1400
Signed-off-by: nayanpatel-arm <nayankumar.patel@arm.com>
Change-Id: I77b03e695532cb13e8f8d3f00c43d973781ceeb0
diff --git a/lib/cpus/aarch64/cortex_a78.S b/lib/cpus/aarch64/cortex_a78.S
index 8c5a45a..3a74571 100644
--- a/lib/cpus/aarch64/cortex_a78.S
+++ b/lib/cpus/aarch64/cortex_a78.S
@@ -154,6 +154,50 @@
b cpu_rev_var_ls
endfunc check_errata_1821534
+/* --------------------------------------------------
+ * Errata Workaround for Cortex A78 Errata 1952683.
+ * This applies to revision r0p0.
+ * x0: variant[4:7] and revision[0:3] of current cpu.
+ * Shall clobber: x0-x17
+ * --------------------------------------------------
+ */
+func errata_a78_1952683_wa
+ /* Check revision. */
+ mov x17, x30
+ bl check_errata_1952683
+ cbz x0, 1f
+
+ ldr x0,=0x5
+ msr S3_6_c15_c8_0,x0
+ ldr x0,=0xEEE10A10
+ msr S3_6_c15_c8_2,x0
+ ldr x0,=0xFFEF0FFF
+ msr S3_6_c15_c8_3,x0
+ ldr x0,=0x0010F000
+ msr S3_6_c15_c8_4,x0
+ ldr x0,=0x0010F000
+ msr S3_6_c15_c8_5,x0
+ ldr x0,=0x40000080023ff
+ msr S3_6_c15_c8_1,x0
+ ldr x0,=0x6
+ msr S3_6_c15_c8_0,x0
+ ldr x0,=0xEE640F34
+ msr S3_6_c15_c8_2,x0
+ ldr x0,=0xFFEF0FFF
+ msr S3_6_c15_c8_3,x0
+ ldr x0,=0x40000080023ff
+ msr S3_6_c15_c8_1,x0
+ isb
+1:
+ ret x17
+endfunc errata_a78_1952683_wa
+
+func check_errata_1952683
+ /* Applies to r0p0 only */
+ mov x1, #0x00
+ b cpu_rev_var_ls
+endfunc check_errata_1952683
+
/* -------------------------------------------------
* The CPU Ops reset function for Cortex-A78
* -------------------------------------------------
@@ -183,6 +227,11 @@
bl errata_a78_1821534_wa
#endif
+#if ERRATA_A78_1952683
+ mov x0, x18
+ bl errata_a78_1952683_wa
+#endif
+
#if ENABLE_AMU
/* Make sure accesses from EL0/EL1 and EL2 are not trapped to EL3 */
mrs x0, actlr_el3
@@ -241,6 +290,7 @@
report_errata ERRATA_A78_1941498, cortex_a78, 1941498
report_errata ERRATA_A78_1951500, cortex_a78, 1951500
report_errata ERRATA_A78_1821534, cortex_a78, 1821534
+ report_errata ERRATA_A78_1952683, cortex_a78, 1952683
ldp x8, x30, [sp], #16
ret
diff --git a/lib/cpus/cpu-ops.mk b/lib/cpus/cpu-ops.mk
index b366167..7175103 100644
--- a/lib/cpus/cpu-ops.mk
+++ b/lib/cpus/cpu-ops.mk
@@ -319,6 +319,10 @@
# 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
+
# Flag to apply T32 CLREX workaround during reset. This erratum applies
# only to r0p0 and r1p0 of the Neoverse N1 cpu.
ERRATA_N1_1043202 ?=0
@@ -658,6 +662,10 @@
$(eval $(call assert_boolean,ERRATA_A78_1821534))
$(eval $(call add_define,ERRATA_A78_1821534))
+# Process ERRATA_A78_1952683 flag
+$(eval $(call assert_boolean,ERRATA_A78_1952683))
+$(eval $(call add_define,ERRATA_A78_1952683))
+
# Process ERRATA_N1_1043202 flag
$(eval $(call assert_boolean,ERRATA_N1_1043202))
$(eval $(call add_define,ERRATA_N1_1043202))