1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (c) 2021 Western Digital Corporation or its affiliates. 4 * Copyright (c) 2022 Ventana Micro Systems Inc. 5 */ 6 7 #ifndef _ASM_RISCV_SUSPEND_H 8 #define _ASM_RISCV_SUSPEND_H 9 10 #include <asm/ptrace.h> 11 12 struct suspend_context { 13 /* Saved and restored by low-level functions */ 14 struct pt_regs regs; 15 /* Saved and restored by high-level functions */ 16 unsigned long scratch; 17 unsigned long tvec; 18 unsigned long ie; 19 #ifdef CONFIG_MMU 20 unsigned long satp; 21 #endif 22 }; 23 24 /* 25 * Used by hibernation core and cleared during resume sequence 26 */ 27 extern int in_suspend; 28 29 /* Low-level CPU suspend entry function */ 30 int __cpu_suspend_enter(struct suspend_context *context); 31 32 /* High-level CPU suspend which will save context and call finish() */ 33 int cpu_suspend(unsigned long arg, 34 int (*finish)(unsigned long arg, 35 unsigned long entry, 36 unsigned long context)); 37 38 /* Low-level CPU resume entry function */ 39 int __cpu_resume_enter(unsigned long hartid, unsigned long context); 40 41 /* Used to save and restore the CSRs */ 42 void suspend_save_csrs(struct suspend_context *context); 43 void suspend_restore_csrs(struct suspend_context *context); 44 45 /* Low-level API to support hibernation */ 46 int swsusp_arch_suspend(void); 47 int swsusp_arch_resume(void); 48 int arch_hibernation_header_save(void *addr, unsigned int max_size); 49 int arch_hibernation_header_restore(void *addr); 50 int __hibernate_cpu_resume(void); 51 52 /* Used to resume on the CPU we hibernated on */ 53 int hibernate_resume_nonboot_cpu_disable(void); 54 55 asmlinkage void hibernate_restore_image(unsigned long resume_satp, unsigned long satp_temp, 56 unsigned long cpu_resume); 57 asmlinkage int hibernate_core_restore_code(void); 58 #endif 59