diff options
author | Palmer Dabbelt <palmer@rivosinc.com> | 2022-03-30 16:17:54 -0700 |
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committer | Palmer Dabbelt <palmer@rivosinc.com> | 2022-03-30 16:17:54 -0700 |
commit | bee7fbc38579ba86948689107518c855247d0b49 (patch) | |
tree | fc46307f316d99295d9d18d1e9ae406230002edf /arch/riscv/include/asm/suspend.h | |
parent | fdecfea09328b33fd08a4d418237cce9fd176d69 (diff) | |
parent | c5179ef1ca0c39dab6955be6b0e3c034cc4164c8 (diff) |
RISC-V CPU Idle Support
This series adds RISC-V CPU Idle support using SBI HSM suspend function.
The RISC-V SBI CPU idle driver added by this series is highly inspired
from the ARM PSCI CPU idle driver.
Special thanks Sandeep Tripathy for providing early feeback on SBI HSM
support in all above projects (RISC-V SBI specification, OpenSBI, and
Linux RISC-V).
* palmer/riscv-idle:
RISC-V: Enable RISC-V SBI CPU Idle driver for QEMU virt machine
dt-bindings: Add common bindings for ARM and RISC-V idle states
cpuidle: Add RISC-V SBI CPU idle driver
cpuidle: Factor-out power domain related code from PSCI domain driver
RISC-V: Add SBI HSM suspend related defines
RISC-V: Add arch functions for non-retentive suspend entry/exit
RISC-V: Rename relocate() and make it global
RISC-V: Enable CPU_IDLE drivers
Diffstat (limited to 'arch/riscv/include/asm/suspend.h')
-rw-r--r-- | arch/riscv/include/asm/suspend.h | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/suspend.h b/arch/riscv/include/asm/suspend.h new file mode 100644 index 000000000000..8be391c2aecb --- /dev/null +++ b/arch/riscv/include/asm/suspend.h @@ -0,0 +1,36 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (c) 2021 Western Digital Corporation or its affiliates. + * Copyright (c) 2022 Ventana Micro Systems Inc. + */ + +#ifndef _ASM_RISCV_SUSPEND_H +#define _ASM_RISCV_SUSPEND_H + +#include <asm/ptrace.h> + +struct suspend_context { + /* Saved and restored by low-level functions */ + struct pt_regs regs; + /* Saved and restored by high-level functions */ + unsigned long scratch; + unsigned long tvec; + unsigned long ie; +#ifdef CONFIG_MMU + unsigned long satp; +#endif +}; + +/* Low-level CPU suspend entry function */ +int __cpu_suspend_enter(struct suspend_context *context); + +/* High-level CPU suspend which will save context and call finish() */ +int cpu_suspend(unsigned long arg, + int (*finish)(unsigned long arg, + unsigned long entry, + unsigned long context)); + +/* Low-level CPU resume entry function */ +int __cpu_resume_enter(unsigned long hartid, unsigned long context); + +#endif |