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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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0b2cca804e
This adds a function to put a 6xx/7xx/7xxx/83xx family CPU into sleep mode, and return after an interrupt has occurred. It expects to be called with interrupts disabled, and returns with interrupts disabled. Interrupts are enabled while the processor is asleep, but the interrupt that wakes the processor is not handled; it is still pending when this function returns. Signed-off-by: Scott Wood <scottwood@freescale.com> Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Paul Mackerras <paulus@samba.org>
53 lines
1.1 KiB
ArmAsm
53 lines
1.1 KiB
ArmAsm
/*
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* Enter and leave sleep state on chips with 6xx-style HID0
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* power management bits, which don't leave sleep state via reset.
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*
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* Author: Scott Wood <scottwood@freescale.com>
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*
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* Copyright (c) 2006-2007 Freescale Semiconductor, Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*/
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#include <asm/ppc_asm.h>
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#include <asm/reg.h>
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#include <asm/thread_info.h>
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#include <asm/asm-offsets.h>
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_GLOBAL(mpc6xx_enter_standby)
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mflr r4
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mfspr r5, SPRN_HID0
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rlwinm r5, r5, 0, ~(HID0_DOZE | HID0_NAP)
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oris r5, r5, HID0_SLEEP@h
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mtspr SPRN_HID0, r5
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isync
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lis r5, ret_from_standby@h
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ori r5, r5, ret_from_standby@l
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mtlr r5
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rlwinm r5, r1, 0, 0, 31-THREAD_SHIFT
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lwz r6, TI_LOCAL_FLAGS(r5)
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ori r6, r6, _TLF_SLEEPING
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stw r6, TI_LOCAL_FLAGS(r5)
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mfmsr r5
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ori r5, r5, MSR_EE
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oris r5, r5, MSR_POW@h
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sync
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mtmsr r5
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isync
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1: b 1b
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ret_from_standby:
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mfspr r5, SPRN_HID0
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rlwinm r5, r5, 0, ~HID0_SLEEP
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mtspr SPRN_HID0, r5
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mtlr r4
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blr
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