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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/loongarch/power/suspend_asm.S
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/* SPDX-License-Identifier: GPL-2.0 */

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/*

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 * Sleep helper for Loongson-3 sleep mode.

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 *

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 * Author: Huacai Chen <[email protected]>

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 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited

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 */

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#include <asm/asm.h>

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#include <asm/asmmacro.h>

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#include <asm/addrspace.h>

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#include <asm/loongarch.h>

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#include <asm/stackframe.h>

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/* preparatory stuff */

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.macro	SETUP_SLEEP

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	PTR_ADDI	sp, sp, -PT_SIZE

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	REG_S		$r1, sp, PT_R1

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	REG_S		$r2, sp, PT_R2

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	REG_S		$r3, sp, PT_R3

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	REG_S		$r4, sp, PT_R4

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	REG_S		$r21, sp, PT_R21

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	REG_S		$r22, sp, PT_R22

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	REG_S		$r23, sp, PT_R23

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	REG_S		$r24, sp, PT_R24

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	REG_S		$r25, sp, PT_R25

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	REG_S		$r26, sp, PT_R26

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	REG_S		$r27, sp, PT_R27

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	REG_S		$r28, sp, PT_R28

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	REG_S		$r29, sp, PT_R29

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	REG_S		$r30, sp, PT_R30

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	REG_S		$r31, sp, PT_R31

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.endm

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.macro SETUP_WAKEUP

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	REG_L		$r1, sp, PT_R1

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	REG_L		$r2, sp, PT_R2

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	REG_L		$r3, sp, PT_R3

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	REG_L		$r4, sp, PT_R4

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	REG_L		$r21, sp, PT_R21

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	REG_L		$r22, sp, PT_R22

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	REG_L		$r23, sp, PT_R23

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	REG_L		$r24, sp, PT_R24

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	REG_L		$r25, sp, PT_R25

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	REG_L		$r26, sp, PT_R26

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	REG_L		$r27, sp, PT_R27

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	REG_L		$r28, sp, PT_R28

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	REG_L		$r29, sp, PT_R29

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	REG_L		$r30, sp, PT_R30

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	REG_L		$r31, sp, PT_R31

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	PTR_ADDI	sp, sp, PT_SIZE

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.endm

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	.text

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	.align 12

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/* Sleep/wakeup code for Loongson-3 */

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SYM_FUNC_START(loongarch_suspend_enter)

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	SETUP_SLEEP

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	la.pcrel	t0, acpi_saved_sp

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	REG_S		sp, t0, 0

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	bl		__flush_cache_all

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	/* Pass RA and SP to BIOS */

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	PTR_ADDI	a1, sp, 0

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	la.pcrel	a0, loongarch_wakeup_start

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	la.pcrel	t0, loongarch_suspend_addr

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	REG_L		t0, t0, 0

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	jirl		ra, t0, 0 /* Call BIOS's STR sleep routine */

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	/*

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	 * This is where we return upon wakeup.

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	 * Reload all of the registers and return.

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	 */

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SYM_INNER_LABEL(loongarch_wakeup_start, SYM_L_GLOBAL)

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	SETUP_DMWINS	t0

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	JUMP_VIRT_ADDR	t0, t1

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	/* Enable PG */

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	li.w		t0, 0xb0		# PLV=0, IE=0, PG=1

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	csrwr		t0, LOONGARCH_CSR_CRMD

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	la.pcrel	t0, acpi_saved_sp

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	REG_L		sp, t0, 0

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	SETUP_WAKEUP

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	jr		ra

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SYM_FUNC_END(loongarch_suspend_enter)

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