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| author | Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> | 2020-06-04 20:39:25 +0300 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2020-06-18 13:07:24 -0700 |
| commit | 10011f7d95dea311c0f2a3ea6725b5a2e97015a8 (patch) | |
| tree | b0564851714e50a0cd01124d824c4a98852adb0e /arch/arc | |
| parent | 040ece2a3c1503c0a7e327034510367747c27a5f (diff) | |
| download | linux-10011f7d95dea311c0f2a3ea6725b5a2e97015a8.tar.gz linux-10011f7d95dea311c0f2a3ea6725b5a2e97015a8.tar.bz2 linux-10011f7d95dea311c0f2a3ea6725b5a2e97015a8.zip | |
ARCv2: support loop buffer (LPB) disabling
On HS cores, loop buffer (LPB) is programmable in runtime and can
be optionally disabled.
Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc')
| -rw-r--r-- | arch/arc/Kconfig | 6 | ||||
| -rw-r--r-- | arch/arc/kernel/head.S | 8 |
2 files changed, 14 insertions, 0 deletions
diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig index 323014149e48..197896cfbd23 100644 --- a/arch/arc/Kconfig +++ b/arch/arc/Kconfig @@ -474,6 +474,12 @@ config ARC_IRQ_NO_AUTOSAVE This is programmable and can be optionally disabled in which case software INTERRUPT_PROLOGUE/EPILGUE do the needed work +config ARC_LPB_DISABLE + bool "Disable loop buffer (LPB)" + help + On HS cores, loop buffer (LPB) is programmable in runtime and can + be optionally disabled. + endif # ISA_ARCV2 endmenu # "ARC CPU Configuration" diff --git a/arch/arc/kernel/head.S b/arch/arc/kernel/head.S index 6eb23f1545ee..17fd1ed700cc 100644 --- a/arch/arc/kernel/head.S +++ b/arch/arc/kernel/head.S @@ -59,6 +59,14 @@ bclr r5, r5, STATUS_AD_BIT #endif kflag r5 + +#ifdef CONFIG_ARC_LPB_DISABLE + lr r5, [ARC_REG_LPB_BUILD] + breq r5, 0, 1f ; LPB doesn't exist + mov r5, 1 + sr r5, [ARC_REG_LPB_CTRL] +1: +#endif /* CONFIG_ARC_LPB_DISABLE */ #endif ; Config DSP_CTRL properly, so kernel may use integer multiply, ; multiply-accumulate, and divide operations |