mirror of
https://github.com/torvalds/linux.git
synced 2024-11-25 05:32:00 +00:00
1c1378a409
Some firmwares don't enable PG when wakeup from suspend, so do it in kernel. This can improve code compatibility for boot kernel. Signed-off-by: Baoqi Zhang <zhangbaoqi@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
93 lines
2.0 KiB
ArmAsm
93 lines
2.0 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Sleep helper for Loongson-3 sleep mode.
|
|
*
|
|
* Author: Huacai Chen <chenhuacai@loongson.cn>
|
|
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
|
|
*/
|
|
|
|
#include <asm/asm.h>
|
|
#include <asm/asmmacro.h>
|
|
#include <asm/addrspace.h>
|
|
#include <asm/loongarch.h>
|
|
#include <asm/stackframe.h>
|
|
|
|
/* preparatory stuff */
|
|
.macro SETUP_SLEEP
|
|
addi.d sp, sp, -PT_SIZE
|
|
st.d $r1, sp, PT_R1
|
|
st.d $r2, sp, PT_R2
|
|
st.d $r3, sp, PT_R3
|
|
st.d $r4, sp, PT_R4
|
|
st.d $r21, sp, PT_R21
|
|
st.d $r22, sp, PT_R22
|
|
st.d $r23, sp, PT_R23
|
|
st.d $r24, sp, PT_R24
|
|
st.d $r25, sp, PT_R25
|
|
st.d $r26, sp, PT_R26
|
|
st.d $r27, sp, PT_R27
|
|
st.d $r28, sp, PT_R28
|
|
st.d $r29, sp, PT_R29
|
|
st.d $r30, sp, PT_R30
|
|
st.d $r31, sp, PT_R31
|
|
|
|
la.pcrel t0, acpi_saved_sp
|
|
st.d sp, t0, 0
|
|
.endm
|
|
|
|
.macro SETUP_WAKEUP
|
|
ld.d $r1, sp, PT_R1
|
|
ld.d $r2, sp, PT_R2
|
|
ld.d $r3, sp, PT_R3
|
|
ld.d $r4, sp, PT_R4
|
|
ld.d $r21, sp, PT_R21
|
|
ld.d $r22, sp, PT_R22
|
|
ld.d $r23, sp, PT_R23
|
|
ld.d $r24, sp, PT_R24
|
|
ld.d $r25, sp, PT_R25
|
|
ld.d $r26, sp, PT_R26
|
|
ld.d $r27, sp, PT_R27
|
|
ld.d $r28, sp, PT_R28
|
|
ld.d $r29, sp, PT_R29
|
|
ld.d $r30, sp, PT_R30
|
|
ld.d $r31, sp, PT_R31
|
|
.endm
|
|
|
|
.text
|
|
.align 12
|
|
|
|
/* Sleep/wakeup code for Loongson-3 */
|
|
SYM_FUNC_START(loongarch_suspend_enter)
|
|
SETUP_SLEEP
|
|
bl __flush_cache_all
|
|
|
|
/* Pass RA and SP to BIOS */
|
|
addi.d a1, sp, 0
|
|
la.pcrel a0, loongarch_wakeup_start
|
|
la.pcrel t0, loongarch_suspend_addr
|
|
ld.d t0, t0, 0
|
|
jirl a0, t0, 0 /* Call BIOS's STR sleep routine */
|
|
|
|
/*
|
|
* This is where we return upon wakeup.
|
|
* Reload all of the registers and return.
|
|
*/
|
|
SYM_INNER_LABEL(loongarch_wakeup_start, SYM_L_GLOBAL)
|
|
li.d t0, CSR_DMW0_INIT # UC, PLV0
|
|
csrwr t0, LOONGARCH_CSR_DMWIN0
|
|
li.d t0, CSR_DMW1_INIT # CA, PLV0
|
|
csrwr t0, LOONGARCH_CSR_DMWIN1
|
|
|
|
JUMP_VIRT_ADDR t0, t1
|
|
|
|
/* Enable PG */
|
|
li.w t0, 0xb0 # PLV=0, IE=0, PG=1
|
|
csrwr t0, LOONGARCH_CSR_CRMD
|
|
|
|
la.pcrel t0, acpi_saved_sp
|
|
ld.d sp, t0, 0
|
|
SETUP_WAKEUP
|
|
addi.d sp, sp, PT_SIZE
|
|
jr ra
|
|
SYM_FUNC_END(loongarch_suspend_enter)
|