Merge changes from topic "erratas" into integration
* changes:
errata: workaround for Neoverse N2 erratum 2025414
errata: workaround for Neoverse N2 erratum 2067956
diff --git a/docs/design/cpu-specific-build-macros.rst b/docs/design/cpu-specific-build-macros.rst
index b5092c4..ff8a66d 100644
--- a/docs/design/cpu-specific-build-macros.rst
+++ b/docs/design/cpu-specific-build-macros.rst
@@ -381,6 +381,14 @@
Cortex-A710 CPU. This needs to be enabled only for revisions r0p0, r1p0 and
r2p0 of the CPU. It is still open.
+For Neoverse N2, the following errata build flags are defined :
+
+- ``ERRATA_N2_2067956``: This applies errata 2067956 workaround to Neoverse-N2
+ CPU. This needs to be enabled for revision r0p0 of the CPU and is still open.
+
+- ``ERRATA_N2_2025414``: This applies errata 2025414 workaround to Neoverse-N2
+ CPU. This needs to be enabled for revision r0p0 of the CPU and is still open.
+
DSU Errata Workarounds
----------------------
diff --git a/include/lib/cpus/aarch64/neoverse_n2.h b/include/lib/cpus/aarch64/neoverse_n2.h
index 7cbd8c1..68f6a40 100644
--- a/include/lib/cpus/aarch64/neoverse_n2.h
+++ b/include/lib/cpus/aarch64/neoverse_n2.h
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2020, Arm Limited. All rights reserved.
+ * Copyright (c) 2020-2021, Arm Limited. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@@ -21,10 +21,17 @@
******************************************************************************/
#define NEOVERSE_N2_CPUECTLR_EL1 S3_0_C15_C1_4
#define NEOVERSE_N2_CPUECTLR_EL1_EXTLLC_BIT (ULL(1) << 0)
+#define NEOVERSE_N2_CPUECTLR_EL1_PFSTIDIS_BIT (ULL(1) << 8)
/*******************************************************************************
* CPU Auxiliary Control register specific definitions.
******************************************************************************/
+#define NEOVERSE_N2_CPUACTLR_EL1 S3_0_C15_C1_0
+#define NEOVERSE_N2_CPUACTLR_EL1_BIT_46 (ULL(1) << 46)
+
+/*******************************************************************************
+ * CPU Auxiliary Control register 2 specific definitions.
+ ******************************************************************************/
#define NEOVERSE_N2_CPUACTLR2_EL1 S3_0_C15_C1_1
#define NEOVERSE_N2_CPUACTLR2_EL1_BIT_2 (ULL(1) << 2)
diff --git a/lib/cpus/aarch64/neoverse_n2.S b/lib/cpus/aarch64/neoverse_n2.S
index 44db0b3..a745ca5 100644
--- a/lib/cpus/aarch64/neoverse_n2.S
+++ b/lib/cpus/aarch64/neoverse_n2.S
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2020, Arm Limited. All rights reserved.
+ * Copyright (c) 2020-2021, Arm Limited. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@@ -61,9 +61,62 @@
b cpu_rev_var_ls
endfunc check_errata_2002655
- /* -------------------------------------------------
+/* ---------------------------------------------------------------
+ * Errata Workaround for Neoverse N2 Erratum 2067956.
+ * This applies to revision r0p0 of Neoverse N2 and is still open.
+ * Inputs:
+ * x0: variant[4:7] and revision[0:3] of current cpu.
+ * Shall clobber: x0-x17
+ * ---------------------------------------------------------------
+ */
+func errata_n2_2067956_wa
+ /* Compare x0 against revision r0p0 */
+ mov x17, x30
+ bl check_errata_2067956
+ cbz x0, 1f
+ mrs x1, NEOVERSE_N2_CPUACTLR_EL1
+ orr x1, x1, NEOVERSE_N2_CPUACTLR_EL1_BIT_46
+ msr NEOVERSE_N2_CPUACTLR_EL1, x1
+1:
+ ret x17
+endfunc errata_n2_2067956_wa
+
+func check_errata_2067956
+ /* Applies to r0p0 */
+ mov x1, #0x00
+ b cpu_rev_var_ls
+endfunc check_errata_2067956
+
+/* ---------------------------------------------------------------
+ * Errata Workaround for Neoverse N2 Erratum 2025414.
+ * This applies to revision r0p0 of Neoverse N2 and is still open.
+ * Inputs:
+ * x0: variant[4:7] and revision[0:3] of current cpu.
+ * Shall clobber: x0-x17
+ * ---------------------------------------------------------------
+ */
+func errata_n2_2025414_wa
+ /* Compare x0 against revision r0p0 */
+ mov x17, x30
+ bl check_errata_2025414
+ cbz x0, 1f
+ mrs x1, NEOVERSE_N2_CPUECTLR_EL1
+ orr x1, x1, NEOVERSE_N2_CPUECTLR_EL1_PFSTIDIS_BIT
+ msr NEOVERSE_N2_CPUECTLR_EL1, x1
+
+1:
+ ret x17
+endfunc errata_n2_2025414_wa
+
+func check_errata_2025414
+ /* Applies to r0p0 */
+ mov x1, #0x00
+ b cpu_rev_var_ls
+endfunc check_errata_2025414
+
+ /* -------------------------------------------
* The CPU Ops reset function for Neoverse N2.
- * -------------------------------------------------
+ * -------------------------------------------
*/
func neoverse_n2_reset_func
mov x19, x30
@@ -81,6 +134,16 @@
orr x0, x0, #NEOVERSE_N2_CPUACTLR2_EL1_BIT_2
msr NEOVERSE_N2_CPUACTLR2_EL1, x0
+#if ERRATA_N2_2067956
+ mov x0, x18
+ bl errata_n2_2067956_wa
+#endif
+
+#if ERRATA_N2_2025414
+ mov x0, x18
+ bl errata_n2_2025414_wa
+#endif
+
#if ENABLE_AMU
/* Make sure accesses from EL0/EL1 and EL2 are not trapped to EL3 */
mrs x0, cptr_el3
@@ -97,9 +160,9 @@
#if NEOVERSE_Nx_EXTERNAL_LLC
/* Some systems may have External LLC, core needs to be made aware */
- mrs x0, NEOVERSE_N2_CPUECTLR_EL1
- orr x0, x0, NEOVERSE_N2_CPUECTLR_EL1_EXTLLC_BIT
- msr NEOVERSE_N2_CPUECTLR_EL1, x0
+ mrs x0, NEOVERSE_N2_CPUECTLR_EL1
+ orr x0, x0, NEOVERSE_N2_CPUECTLR_EL1_EXTLLC_BIT
+ msr NEOVERSE_N2_CPUECTLR_EL1, x0
#endif
bl cpu_get_rev_var
@@ -111,14 +174,14 @@
#endif
isb
- ret x19
+ ret x19
endfunc neoverse_n2_reset_func
func neoverse_n2_core_pwr_dwn
- /* ---------------------------------------------
+ /* ---------------------------------------------------
* Enable CPU power down bit in power control register
* No need to do cache maintenance here.
- * ---------------------------------------------
+ * ---------------------------------------------------
*/
mrs x0, NEOVERSE_N2_CPUPWRCTLR_EL1
orr x0, x0, #NEOVERSE_N2_CORE_PWRDN_EN_BIT
@@ -142,6 +205,8 @@
* checking functions of each errata.
*/
report_errata ERRATA_N2_2002655, neoverse_n2, 2002655
+ report_errata ERRATA_N2_2067956, neoverse_n2, 2067956
+ report_errata ERRATA_N2_2025414, neoverse_n2, 2025414
ldp x8, x30, [sp], #16
ret
diff --git a/lib/cpus/cpu-ops.mk b/lib/cpus/cpu-ops.mk
index ab50933..8a2dd46 100644
--- a/lib/cpus/cpu-ops.mk
+++ b/lib/cpus/cpu-ops.mk
@@ -425,6 +425,14 @@
# to revisions r0p0, r1p0 and r2p0 of the Cortex-A710 cpu and is still open.
ERRATA_A710_2081180 ?=0
+# Flag to apply erratum 2067956 workaround during reset. This erratum applies
+# to revision r0p0 of the Neoverse N2 cpu and is still open.
+ERRATA_N2_2067956 ?=0
+
+# Flag to apply erratum 2025414 workaround during reset. This erratum applies
+# to revision r0p0 of the Neoverse N2 cpu and is still open.
+ERRATA_N2_2025414 ?=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
@@ -782,6 +790,14 @@
$(eval $(call assert_boolean,ERRATA_A710_2081180))
$(eval $(call add_define,ERRATA_A710_2081180))
+# Process ERRATA_N2_2067956 flag
+$(eval $(call assert_boolean,ERRATA_N2_2067956))
+$(eval $(call add_define,ERRATA_N2_2067956))
+
+# Process ERRATA_N2_2025414 flag
+$(eval $(call assert_boolean,ERRATA_N2_2025414))
+$(eval $(call add_define,ERRATA_N2_2025414))
+
# Process ERRATA_DSU_798953 flag
$(eval $(call assert_boolean,ERRATA_DSU_798953))
$(eval $(call add_define,ERRATA_DSU_798953))