2022-12-10 22:40:15 +08:00
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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 <chenhuacai@loongson.cn>
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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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addi.d sp, sp, -PT_SIZE
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st.d $r1, sp, PT_R1
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st.d $r2, sp, PT_R2
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st.d $r3, sp, PT_R3
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st.d $r4, sp, PT_R4
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st.d $r21, sp, PT_R21
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st.d $r22, sp, PT_R22
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st.d $r23, sp, PT_R23
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st.d $r24, sp, PT_R24
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st.d $r25, sp, PT_R25
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st.d $r26, sp, PT_R26
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st.d $r27, sp, PT_R27
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st.d $r28, sp, PT_R28
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st.d $r29, sp, PT_R29
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st.d $r30, sp, PT_R30
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st.d $r31, sp, PT_R31
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la.pcrel t0, acpi_saved_sp
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st.d sp, t0, 0
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.endm
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.macro SETUP_WAKEUP
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ld.d $r1, sp, PT_R1
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ld.d $r2, sp, PT_R2
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ld.d $r3, sp, PT_R3
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ld.d $r4, sp, PT_R4
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ld.d $r21, sp, PT_R21
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ld.d $r22, sp, PT_R22
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ld.d $r23, sp, PT_R23
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ld.d $r24, sp, PT_R24
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ld.d $r25, sp, PT_R25
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ld.d $r26, sp, PT_R26
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ld.d $r27, sp, PT_R27
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ld.d $r28, sp, PT_R28
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ld.d $r29, sp, PT_R29
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ld.d $r30, sp, PT_R30
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ld.d $r31, sp, PT_R31
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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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bl __flush_cache_all
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/* Pass RA and SP to BIOS */
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addi.d 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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ld.d t0, t0, 0
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jirl a0, 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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li.d t0, CSR_DMW0_INIT # UC, PLV0
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csrwr t0, LOONGARCH_CSR_DMWIN0
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li.d t0, CSR_DMW1_INIT # CA, PLV0
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csrwr t0, LOONGARCH_CSR_DMWIN1
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2023-02-25 15:52:56 +08:00
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JUMP_VIRT_ADDR t0, t1
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2023-04-18 19:38:58 +08:00
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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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2022-12-10 22:40:15 +08:00
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la.pcrel t0, acpi_saved_sp
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ld.d sp, t0, 0
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SETUP_WAKEUP
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addi.d sp, sp, PT_SIZE
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jr ra
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SYM_FUNC_END(loongarch_suspend_enter)
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