errata: workaround for Cortex-A710 erratum 2055002
Cortex-A710 erratum 2055002 is a Cat B erratum that applies to
revisions r1p0 & r2p0 and is still open. The workaround is to
set CPUACTLR_EL1[46] to force L2 tag ECC inline correction mode.
This workaround works on revision r1p0 & r2p0.
SDEN can be found here:
https://developer.arm.com/documentation/SDEN1775101/latest
Signed-off-by: Bipin Ravi <bipin.ravi@arm.com>
Change-Id: I67be1dce53c4651167d8cee33c116e73b9dafe81
diff --git a/lib/cpus/aarch64/cortex_a710.S b/lib/cpus/aarch64/cortex_a710.S
index 469b430..ac2517c 100644
--- a/lib/cpus/aarch64/cortex_a710.S
+++ b/lib/cpus/aarch64/cortex_a710.S
@@ -107,6 +107,32 @@
b cpu_rev_var_ls
endfunc check_errata_2081180
+/* ---------------------------------------------------------------------
+ * Errata Workaround for Cortex-A710 Erratum 2055002.
+ * This applies to revision r1p0, r2p0 of Cortex-A710 and is still open.
+ * Inputs:
+ * x0: variant[4:7] and revision[0:3] of current cpu.
+ * Shall clobber: x0-x17
+ * ---------------------------------------------------------------------
+ */
+func errata_a710_2055002_wa
+ /* Compare x0 against revision r2p0 */
+ mov x17, x30
+ bl check_errata_2055002
+ cbz x0, 1f
+ mrs x1, CORTEX_A710_CPUACTLR_EL1
+ orr x1, x1, CORTEX_A710_CPUACTLR_EL1_BIT_46
+ msr CORTEX_A710_CPUACTLR_EL1, x1
+1:
+ ret x17
+endfunc errata_a710_2055002_wa
+
+func check_errata_2055002
+ /* Applies to r1p0, r2p0 */
+ mov x1, #0x20
+ b cpu_rev_var_ls
+endfunc check_errata_2055002
+
/* ----------------------------------------------------
* HW will do the cache maintenance while powering down
* ----------------------------------------------------
@@ -123,10 +149,10 @@
ret
endfunc cortex_a710_core_pwr_dwn
+#if REPORT_ERRATA
/*
- * Errata printing function for Cortex A710. Must follow AAPCS.
+ * Errata printing function for Cortex-A710. Must follow AAPCS.
*/
-#if REPORT_ERRATA
func cortex_a710_errata_report
stp x8, x30, [sp, #-16]!
@@ -139,6 +165,7 @@
*/
report_errata ERRATA_A710_1987031, cortex_a710, 1987031
report_errata ERRATA_A710_2081180, cortex_a710, 2081180
+ report_errata ERRATA_A710_2055002, cortex_a710, 2055002
ldp x8, x30, [sp], #16
ret
@@ -164,8 +191,13 @@
bl errata_a710_2081180_wa
#endif
+#if ERRATA_A710_2055002
+ mov x0, x18
+ bl errata_a710_2055002_wa
+#endif
+
isb
- ret x19
+ ret x19
endfunc cortex_a710_reset_func
/* ---------------------------------------------
diff --git a/lib/cpus/cpu-ops.mk b/lib/cpus/cpu-ops.mk
index f93aecd..fe66fbb 100644
--- a/lib/cpus/cpu-ops.mk
+++ b/lib/cpus/cpu-ops.mk
@@ -429,6 +429,10 @@
# to revision r0p0 of the Neoverse N2 cpu and is still open.
ERRATA_N2_2025414 ?=0
+# Flag to apply erratum 2055002 workaround during reset. This erratum applies
+# to revision r1p0, r2p0 of the Cortex-A710 cpu and is still open.
+ERRATA_A710_2055002 ?=0
+
# Flag to apply DSU erratum 798953. This erratum applies to DSUs revision r0p0.
# Applying the workaround results in higher DSU power consumption on idle.
ERRATA_DSU_798953 ?=0
@@ -790,6 +794,10 @@
$(eval $(call assert_boolean,ERRATA_N2_2025414))
$(eval $(call add_define,ERRATA_N2_2025414))
+# Process ERRATA_A710_2055002 flag
+$(eval $(call assert_boolean,ERRATA_A710_2055002))
+$(eval $(call add_define,ERRATA_A710_2055002))
+
# Process ERRATA_DSU_798953 flag
$(eval $(call assert_boolean,ERRATA_DSU_798953))
$(eval $(call add_define,ERRATA_DSU_798953))