errata: workaround for Neoverse-V1 erratum 2108267
Neoverse-V1 erratum 2108267 is a Cat B erratum that applies to
revisions r0p0, r1p0, and r1p1 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/SDEN1401781/latest
Signed-off-by: nayanpatel-arm <nayankumar.patel@arm.com>
Change-Id: Iedcb84a7ad34af7083116818f49d7296f7d9bf94
diff --git a/lib/cpus/aarch64/neoverse_v1.S b/lib/cpus/aarch64/neoverse_v1.S
index 0bcf52a..200f67d 100644
--- a/lib/cpus/aarch64/neoverse_v1.S
+++ b/lib/cpus/aarch64/neoverse_v1.S
@@ -259,6 +259,35 @@
b cpu_rev_var_ls
endfunc check_errata_2139242
+ /* --------------------------------------------------
+ * Errata Workaround for Neoverse V1 Errata #2108267.
+ * This applies to revisions r0p0, r1p0, and r1p1, it
+ * is still open.
+ * x0: variant[4:7] and revision[0:3] of current cpu.
+ * Shall clobber: x0-x1, x17
+ * --------------------------------------------------
+ */
+func errata_neoverse_v1_2108267_wa
+ /* Check workaround compatibility. */
+ mov x17, x30
+ bl check_errata_2108267
+ cbz x0, 1f
+
+ /* Apply the workaround. */
+ mrs x1, NEOVERSE_V1_CPUECTLR_EL1
+ mov x0, #NEOVERSE_V1_CPUECTLR_EL1_PF_MODE_CNSRV
+ bfi x1, x0, #CPUECTLR_EL1_PF_MODE_LSB, #CPUECTLR_EL1_PF_MODE_WIDTH
+ msr NEOVERSE_V1_CPUECTLR_EL1, x1
+1:
+ ret x17
+endfunc errata_neoverse_v1_2108267_wa
+
+func check_errata_2108267
+ /* Applies to r0p0, r1p0, r1p1 */
+ mov x1, #0x11
+ b cpu_rev_var_ls
+endfunc check_errata_2108267
+
/* ---------------------------------------------
* HW will do the cache maintenance while powering down
* ---------------------------------------------
@@ -296,6 +325,7 @@
report_errata ERRATA_V1_1940577, neoverse_v1, 1940577
report_errata ERRATA_V1_1966096, neoverse_v1, 1966096
report_errata ERRATA_V1_2139242, neoverse_v1, 2139242
+ report_errata ERRATA_V1_2108267, neoverse_v1, 2108267
ldp x8, x30, [sp], #16
ret
@@ -344,6 +374,11 @@
bl errata_neoverse_v1_2139242_wa
#endif
+#if ERRATA_V1_2108267
+ mov x0, x18
+ bl errata_neoverse_v1_2108267_wa
+#endif
+
ret x19
endfunc neoverse_v1_reset_func