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/* 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)
SETUP_DMWINS t0
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)
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