errata: workaround for Cortex-A78 erratum 2132060
Cortex-A78 erratum 2132060 is a Cat B erratum that applies to
revisions r0p0, r1p0, r1p1, and r1p2 of CPU. It is still open.
The workaround is to write the value 2'b11 to the PF_MODE bits
in the CPUECTLR_EL1 register which will place the data prefetcher
in the most conservative mode instead of disabling it.
SDEN can be found here:
https://developer.arm.com/documentation/SDEN1401784/latest
Signed-off-by: nayanpatel-arm <nayankumar.patel@arm.com>
Change-Id: If7dec72578633d37d110d103099e406c3a970ff7
diff --git a/lib/cpus/aarch64/cortex_a78.S b/lib/cpus/aarch64/cortex_a78.S
index 3a74571..4e8a228 100644
--- a/lib/cpus/aarch64/cortex_a78.S
+++ b/lib/cpus/aarch64/cortex_a78.S
@@ -198,6 +198,35 @@
b cpu_rev_var_ls
endfunc check_errata_1952683
+/* --------------------------------------------------
+ * Errata Workaround for Cortex A78 Errata 2132060.
+ * This applies to revisions r0p0, r1p0, r1p1, and r1p2.
+ * It is still open.
+ * x0: variant[4:7] and revision[0:3] of current cpu.
+ * Shall clobber: x0-x1, x17
+ * --------------------------------------------------
+ */
+func errata_a78_2132060_wa
+ /* Check revision. */
+ mov x17, x30
+ bl check_errata_2132060
+ cbz x0, 1f
+
+ /* Apply the workaround. */
+ mrs x1, CORTEX_A78_CPUECTLR_EL1
+ mov x0, #CORTEX_A78_CPUECTLR_EL1_PF_MODE_CNSRV
+ bfi x1, x0, #CPUECTLR_EL1_PF_MODE_LSB, #CPUECTLR_EL1_PF_MODE_WIDTH
+ msr CORTEX_A78_CPUECTLR_EL1, x1
+1:
+ ret x17
+endfunc errata_a78_2132060_wa
+
+func check_errata_2132060
+ /* Applies to r0p0, r0p1, r1p1, and r1p2 */
+ mov x1, #0x12
+ b cpu_rev_var_ls
+endfunc check_errata_2132060
+
/* -------------------------------------------------
* The CPU Ops reset function for Cortex-A78
* -------------------------------------------------
@@ -232,6 +261,11 @@
bl errata_a78_1952683_wa
#endif
+#if ERRATA_A78_2132060
+ mov x0, x18
+ bl errata_a78_2132060_wa
+#endif
+
#if ENABLE_AMU
/* Make sure accesses from EL0/EL1 and EL2 are not trapped to EL3 */
mrs x0, actlr_el3
@@ -291,6 +325,7 @@
report_errata ERRATA_A78_1951500, cortex_a78, 1951500
report_errata ERRATA_A78_1821534, cortex_a78, 1821534
report_errata ERRATA_A78_1952683, cortex_a78, 1952683
+ report_errata ERRATA_A78_2132060, cortex_a78, 2132060
ldp x8, x30, [sp], #16
ret