Cortex-A55: Implement workaround for erratum 846532
Change-Id: Iacb6331c1f6b27340e71279f92f147ebbc71862f Signed-off-by: Ambroise Vincent <ambroise.vincent@arm.com>
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@ -108,6 +108,9 @@ For Cortex-A55, the following errata build flags are defined :
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- ``ERRATA_A55_798797``: This applies errata 798797 workaround to Cortex-A55
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CPU. This needs to be enabled only for revision r0p0 of the CPU.
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- ``ERRATA_A55_846532``: This applies errata 846532 workaround to Cortex-A55
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CPU. This needs to be enabled only for revision <= r0p1 of the CPU.
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For Cortex-A57, the following errata build flags are defined :
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- ``ERRATA_A57_806969``: This applies errata 806969 workaround to Cortex-A57
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@ -110,6 +110,38 @@ func check_errata_798797
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b cpu_rev_var_ls
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endfunc check_errata_798797
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/* --------------------------------------------------------------------
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* Errata Workaround for Cortex A55 Errata #846532.
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* This applies only to revisions <= r0p1 of Cortex A55.
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* Disabling dual-issue has a small impact on performance. Disabling a
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* power optimization feature is an alternate workaround with no impact
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* on performance but with an increase in power consumption (see errata
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* notice).
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* Inputs:
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* x0: variant[4:7] and revision[0:3] of current cpu.
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* Shall clobber: x0-x17
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* --------------------------------------------------------------------
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*/
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func errata_a55_846532_wa
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/*
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* Compare x0 against revision r0p1
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*/
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mov x17, x30
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bl check_errata_846532
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cbz x0, 1f
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mrs x1, CORTEX_A55_CPUACTLR_EL1
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orr x1, x1, #CORTEX_A55_CPUACTLR_EL1_DISABLE_DUAL_ISSUE
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msr CORTEX_A55_CPUACTLR_EL1, x1
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isb
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1:
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ret x17
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endfunc errata_a55_846532_wa
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func check_errata_846532
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mov x1, #0x01
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b cpu_rev_var_ls
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endfunc check_errata_846532
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func cortex_a55_reset_func
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mov x19, x30
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@ -135,6 +167,11 @@ func cortex_a55_reset_func
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bl errata_a55_798797_wa
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#endif
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#if ERRATA_A55_846532
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mov x0, x18
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bl errata_a55_846532_wa
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#endif
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ret x19
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endfunc cortex_a55_reset_func
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@ -171,6 +208,7 @@ func cortex_a55_errata_report
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report_errata ERRATA_A55_768277, cortex_a55, 768277
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report_errata ERRATA_A55_778703, cortex_a55, 778703
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report_errata ERRATA_A55_798797, cortex_a55, 798797
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report_errata ERRATA_A55_846532, cortex_a55, 846532
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ldp x8, x30, [sp], #16
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ret
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@ -91,6 +91,10 @@ ERRATA_A55_778703 ?=0
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# only to revision r0p0 of the Cortex A55 cpu.
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ERRATA_A55_798797 ?=0
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# Flag to apply erratum 846532 workaround during reset. This erratum applies
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# only to revision <= r0p1 of the Cortex A55 cpu.
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ERRATA_A55_846532 ?=0
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# Flag to apply erratum 806969 workaround during reset. This erratum applies
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# only to revision r0p0 of the Cortex A57 cpu.
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ERRATA_A57_806969 ?=0
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@ -172,6 +176,10 @@ $(eval $(call add_define,ERRATA_A55_778703))
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$(eval $(call assert_boolean,ERRATA_A55_798797))
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$(eval $(call add_define,ERRATA_A55_798797))
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# Process ERRATA_A55_846532 flag
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$(eval $(call assert_boolean,ERRATA_A55_846532))
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$(eval $(call add_define,ERRATA_A55_846532))
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# Process ERRATA_A57_806969 flag
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$(eval $(call assert_boolean,ERRATA_A57_806969))
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$(eval $(call add_define,ERRATA_A57_806969))
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