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fix(errata): workaround for Neoverse-N2 erratum 2242400 

Neoverse-N2 erratum 2242400 is a Cat B erratum that applies to
revision r0p0 of CPU. It is still open. The workaround
is to set CPUACTLR5_EL1[17] to 1'b1 followed by setting few
system control registers to specific values as per attached
SDEN document.

SDEN can be found here:
https://developer.arm.com/documentation/SDEN1982442/latest

Signed-off-by: nayanpatel-arm <nayankumar.patel@arm.com>
Change-Id: I6a9cb4a23238b8b511802a1ee9fcc5b207137649
This commit is contained in:
nayanpatel-arm 2021-10-07 17:59:33 -07:00
parent c948185c97
commit 603806d137
4 changed files with 59 additions and 4 deletions
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3
docs/design/cpu-specific-build-macros.rst
View File

@ -426,6 +426,9 @@ For Neoverse N2, the following errata build flags are defined :
- ``ERRATA_N2_2138958``: This applies errata 2138958 workaround to Neoverse-N2
CPU. This needs to be enabled for revision r0p0 of the CPU and is still open.
- ``ERRATA_N2_2242400``: This applies errata 2242400 workaround to Neoverse-N2
CPU. This needs to be enabled for revision r0p0 of the CPU and is still open.
DSU Errata Workarounds
----------------------

1
include/lib/cpus/aarch64/neoverse_n2.h
View File

@ -42,6 +42,7 @@
#define NEOVERSE_N2_CPUACTLR5_EL1 S3_0_C15_C8_0
#define NEOVERSE_N2_CPUACTLR5_EL1_BIT_44 (ULL(1) << 44)
#define NEOVERSE_N2_CPUACTLR5_EL1_BIT_13 (ULL(1) << 13)
#define NEOVERSE_N2_CPUACTLR5_EL1_BIT_17 (ULL(1) << 17)
/*******************************************************************************
* CPU Auxiliary Control register specific definitions.

51
lib/cpus/aarch64/neoverse_n2.S
View File

@ -268,6 +268,43 @@ func check_errata_2138958
b cpu_rev_var_ls
endfunc check_errata_2138958
/* --------------------------------------------------
* Errata Workaround for Neoverse N2 Erratum 2242400.
* This applies to revision r0p0 of Neoverse N2. it is still open.
* Inputs:
* x0: variant[4:7] and revision[0:3] of current cpu.
* Shall clobber: x0-x1, x17
* --------------------------------------------------
*/
func errata_n2_2242400_wa
/* Check revision. */
mov x17, x30
bl check_errata_2242400
cbz x0, 1f
/* Apply instruction patching sequence */
mrs x1, NEOVERSE_N2_CPUACTLR5_EL1
orr x1, x1, NEOVERSE_N2_CPUACTLR5_EL1_BIT_17
msr NEOVERSE_N2_CPUACTLR5_EL1, x1
ldr x0, =0x2
msr S3_6_c15_c8_0, x0
ldr x0, =0x10F600E000
msr S3_6_c15_c8_2, x0
ldr x0, =0x10FF80E000
msr S3_6_c15_c8_3, x0
ldr x0, =0x80000000003FF
msr S3_6_c15_c8_1, x0
isb
1:
ret x17
endfunc errata_n2_2242400_wa
func check_errata_2242400
/* Applies to r0p0 */
mov x1, #0x00
b cpu_rev_var_ls
endfunc check_errata_2242400
/* -------------------------------------------
* The CPU Ops reset function for Neoverse N2.
* -------------------------------------------
@ -294,13 +331,13 @@ func neoverse_n2_reset_func
#endif
#if ERRATA_N2_2025414
mov x0, x18
bl errata_n2_2025414_wa
mov x0, x18
bl errata_n2_2025414_wa
#endif
#if ERRATA_N2_2189731
mov x0, x18
bl errata_n2_2189731_wa
mov x0, x18
bl errata_n2_2189731_wa
#endif
@ -324,6 +361,11 @@ func neoverse_n2_reset_func
bl errata_n2_2138958_wa
#endif
#if ERRATA_N2_2242400
mov x0, x18
bl errata_n2_2242400_wa
#endif
#if ENABLE_AMU
/* Make sure accesses from EL0/EL1 and EL2 are not trapped to EL3 */
mrs x0, cptr_el3
@ -392,6 +434,7 @@ func neoverse_n2_errata_report
report_errata ERRATA_N2_2138953, neoverse_n2, 2138953
report_errata ERRATA_N2_2242415, neoverse_n2, 2242415
report_errata ERRATA_N2_2138958, neoverse_n2, 2138958
report_errata ERRATA_N2_2242400, neoverse_n2, 2242400
ldp x8, x30, [sp], #16
ret

8
lib/cpus/cpu-ops.mk
View File

@ -469,6 +469,10 @@ ERRATA_N2_2242415 ?=0
# to revision r0p0 of the Neoverse N2 cpu and is still open.
ERRATA_N2_2138958 ?=0
# Flag to apply erratum 2242400 workaround during reset. This erratum applies
# to revision r0p0 of the Neoverse N2 cpu and is still open.
ERRATA_N2_2242400 ?=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
@ -878,6 +882,10 @@ $(eval $(call add_define,ERRATA_N2_2242415))
$(eval $(call assert_boolean,ERRATA_N2_2138958))
$(eval $(call add_define,ERRATA_N2_2138958))
# Process ERRATA_N2_2242400 flag
$(eval $(call assert_boolean,ERRATA_N2_2242400))
$(eval $(call add_define,ERRATA_N2_2242400))
# Process ERRATA_A710_2055002 flag
$(eval $(call assert_boolean,ERRATA_A710_2055002))
$(eval $(call add_define,ERRATA_A710_2055002))