mirror of
https://github.com/torvalds/linux.git
synced 2024-11-18 18:11:56 +00:00
98 lines
2.1 KiB
ArmAsm
98 lines
2.1 KiB
ArmAsm
|
/*
|
||
|
|
* This file contains the power_save function for 970-family CPUs.
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or
|
||
|
|
* modify it under the terms of the GNU General Public License
|
||
|
|
* as published by the Free Software Foundation; either version
|
||
|
|
* 2 of the License, or (at your option) any later version.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/threads.h>
|
||
|
|
#include <asm/processor.h>
|
||
|
|
#include <asm/page.h>
|
||
|
|
#include <asm/cputable.h>
|
||
|
|
#include <asm/thread_info.h>
|
||
|
|
#include <asm/ppc_asm.h>
|
||
|
|
#include <asm/asm-offsets.h>
|
||
|
|
#include <asm/ppc-opcode.h>
|
||
|
|
|
||
|
|
#undef DEBUG
|
||
|
|
|
||
|
|
.text
|
||
|
|
|
||
|
|
_GLOBAL(power7_idle)
|
||
|
|
/* Now check if user or arch enabled NAP mode */
|
||
|
|
LOAD_REG_ADDRBASE(r3,powersave_nap)
|
||
|
|
lwz r4,ADDROFF(powersave_nap)(r3)
|
||
|
|
cmpwi 0,r4,0
|
||
|
|
beqlr
|
||
|
|
|
||
|
|
/* NAP is a state loss, we create a regs frame on the
|
||
|
|
* stack, fill it up with the state we care about and
|
||
|
|
* stick a pointer to it in PACAR1. We really only
|
||
|
|
* need to save PC, some CR bits and the NV GPRs,
|
||
|
|
* but for now an interrupt frame will do.
|
||
|
|
*/
|
||
|
|
mflr r0
|
||
|
|
std r0,16(r1)
|
||
|
|
stdu r1,-INT_FRAME_SIZE(r1)
|
||
|
|
std r0,_LINK(r1)
|
||
|
|
std r0,_NIP(r1)
|
||
|
|
|
||
|
|
#ifndef CONFIG_SMP
|
||
|
|
/* Make sure FPU, VSX etc... are flushed as we may lose
|
||
|
|
* state when going to nap mode
|
||
|
|
*/
|
||
|
|
bl .discard_lazy_cpu_state
|
||
|
|
#endif /* CONFIG_SMP */
|
||
|
|
|
||
|
|
/* Hard disable interrupts */
|
||
|
|
mfmsr r9
|
||
|
|
rldicl r9,r9,48,1
|
||
|
|
rotldi r9,r9,16
|
||
|
|
mtmsrd r9,1 /* hard-disable interrupts */
|
||
|
|
li r0,0
|
||
|
|
stb r0,PACASOFTIRQEN(r13) /* we'll hard-enable shortly */
|
||
|
|
stb r0,PACAHARDIRQEN(r13)
|
||
|
|
|
||
|
|
/* Continue saving state */
|
||
|
|
SAVE_GPR(2, r1)
|
||
|
|
SAVE_NVGPRS(r1)
|
||
|
|
mfcr r3
|
||
|
|
std r3,_CCR(r1)
|
||
|
|
std r9,_MSR(r1)
|
||
|
|
std r1,PACAR1(r13)
|
||
|
|
|
||
|
|
/* Magic NAP mode enter sequence */
|
||
|
|
std r0,0(r1)
|
||
|
|
ptesync
|
||
|
|
ld r0,0(r1)
|
||
|
|
1: cmp cr0,r0,r0
|
||
|
|
bne 1b
|
||
|
|
PPC_NAP
|
||
|
|
b .
|
||
|
|
|
||
|
|
_GLOBAL(power7_wakeup_loss)
|
||
|
|
GET_PACA(r13)
|
||
|
|
ld r1,PACAR1(r13)
|
||
|
|
REST_NVGPRS(r1)
|
||
|
|
REST_GPR(2, r1)
|
||
|
|
ld r3,_CCR(r1)
|
||
|
|
ld r4,_MSR(r1)
|
||
|
|
ld r5,_NIP(r1)
|
||
|
|
addi r1,r1,INT_FRAME_SIZE
|
||
|
|
mtcr r3
|
||
|
|
mtspr SPRN_SRR1,r4
|
||
|
|
mtspr SPRN_SRR0,r5
|
||
|
|
rfid
|
||
|
|
|
||
|
|
_GLOBAL(power7_wakeup_noloss)
|
||
|
|
GET_PACA(r13)
|
||
|
|
ld r1,PACAR1(r13)
|
||
|
|
ld r4,_MSR(r1)
|
||
|
|
ld r5,_NIP(r1)
|
||
|
|
addi r1,r1,INT_FRAME_SIZE
|
||
|
|
mtspr SPRN_SRR1,r4
|
||
|
|
mtspr SPRN_SRR0,r5
|
||
|
|
rfid
|