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fix(cpus): workaround for Neoverse N2 erratum 2340933

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Neoverse N2 erratum 2340933 is a Cat B erratum that applies to
revision r0p0 and is fixed in r0p1. The workaround is to set
CPUACTLR5_EL1[61] to 1.

SDEN documentation:
https://developer.arm.com/documentation/SDEN-1982442/latest

Change-Id: I121add0dd35072c53392d33f049d893a5ff6354f
Signed-off-by: Bipin Ravi <bipin.ravi@arm.com>
This commit is contained in:
Bipin Ravi 2023-10-17 06:21:15 -05:00 • committed by laurenw-arm
parent 6cb8be17a5
commit 68085ad482
4 changed files with 25 additions and 9 deletions
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4
docs/design/cpu-specific-build-macros.rst
View file

@ -655,6 +655,10 @@ For Neoverse N2, the following errata build flags are defined :
CPU. This needs to be enabled for revision r0p0 of the CPU, it is fixed in
r0p1.
- ``ERRATA_N2_2340933``: This applies errata 2340933 workaround to Neoverse-N2
CPU. This needs to be enabled for revision r0p0 of the CPU, it is fixed in
r0p1.
- ``ERRATA_N2_2346952``: This applies errata 2346952 workaround to Neoverse-N2
CPU. This needs to be enabled for revisions r0p0, r0p1 and r0p2 of the CPU,
it is fixed in r0p3.

7
lib/cpus/aarch64/neoverse_n2.S
View file

@ -165,6 +165,13 @@ workaround_runtime_end neoverse_n2, ERRATUM(2326639)
check_erratum_ls neoverse_n2, ERRATUM(2326639), CPU_REV(0, 0)
workaround_runtime_start neoverse_n2, ERRATUM(2340933), ERRATA_N2_2340933
/* Set bit 61 in CPUACTLR5_EL1 */
sysreg_bit_set NEOVERSE_N2_CPUACTLR5_EL1, BIT(61)
workaround_runtime_end neoverse_n2, ERRATUM(2340933)
check_erratum_ls neoverse_n2, ERRATUM(2340933), CPU_REV(0, 0)
workaround_runtime_start neoverse_n2, ERRATUM(2346952), ERRATA_N2_2346952
/* Set TXREQ to STATIC and full L2 TQ size */
mrs x1, NEOVERSE_N2_CPUECTLR2_EL1

6
lib/cpus/cpu-ops.mk
View file

@ -656,10 +656,14 @@ CPU_FLAG_LIST += ERRATA_N2_2242400
# to revision r0p0 of the Neoverse N2 cpu and is fixed in r0p1.
CPU_FLAG_LIST += ERRATA_N2_2280757
# Flag to apply erraturm 2326639 workaroud during powerdown. This erratum
# Flag to apply erratum 2326639 workaroud during powerdown. This erratum
# applies to revision r0p0 of the Neoverse N2 cpu and is fixed in r0p1.
CPU_FLAG_LIST += ERRATA_N2_2326639
# Flag to apply erratum 2340933 workaroud during reset. This erratum
# applies to revision r0p0 of the Neoverse N2 cpu and is fixed in r0p1.
CPU_FLAG_LIST += ERRATA_N2_2340933
# Flag to apply erratum 2346952 workaround during reset. This erratum applies
# to r0p0, r0p1, r0p2 of the Neoverse N2 cpu, it is fixed in r0p3.
CPU_FLAG_LIST += ERRATA_N2_2346952

17
services/std_svc/errata_abi/errata_abi_main.c
View file

@ -350,15 +350,16 @@ struct em_cpu_list cpu_list[] = {
[9] = {2242415, 0x00, 0x00, ERRATA_N2_2242415},
[10] = {2280757, 0x00, 0x00, ERRATA_N2_2280757},
[11] = {2326639, 0x00, 0x00, ERRATA_N2_2326639},
[12] = {2346952, 0x00, 0x02, ERRATA_N2_2346952},
[13] = {2376738, 0x00, 0x00, ERRATA_N2_2376738},
[14] = {2388450, 0x00, 0x00, ERRATA_N2_2388450},
[15] = {2728475, 0x00, 0x02, ERRATA_N2_2728475, \
[12] = {2340933, 0x00, 0x00, ERRATA_N2_2340933},
[13] = {2346952, 0x00, 0x02, ERRATA_N2_2346952},
[14] = {2376738, 0x00, 0x00, ERRATA_N2_2376738},
[15] = {2388450, 0x00, 0x00, ERRATA_N2_2388450},
[16] = {2728475, 0x00, 0x02, ERRATA_N2_2728475, \
ERRATA_NON_ARM_INTERCONNECT},
[16] = {2743014, 0x00, 0x02, ERRATA_N2_2743014},
[17] = {2743089, 0x00, 0x02, ERRATA_N2_2743089},
[18] = {2779511, 0x00, 0x02, ERRATA_N2_2779511},
[19 ... ERRATA_LIST_END] = UNDEF_ERRATA,
[17] = {2743014, 0x00, 0x02, ERRATA_N2_2743014},
[18] = {2743089, 0x00, 0x02, ERRATA_N2_2743089},
[19] = {2779511, 0x00, 0x02, ERRATA_N2_2779511},
[20 ... ERRATA_LIST_END] = UNDEF_ERRATA,
}
},
#endif /* NEOVERSE_N2_H_INC */