| 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
|---|---|
| 2 | /* |
| 3 | * loongson-specific suspend support |
| 4 | * |
| 5 | * Copyright (C) 2009 Lemote Inc. |
| 6 | * Author: Wu Zhangjin <wuzhangjin@gmail.com> |
| 7 | */ |
| 8 | #include <linux/suspend.h> |
| 9 | #include <linux/pm.h> |
| 10 | |
| 11 | #include <asm/mipsregs.h> |
| 12 | |
| 13 | #include <loongson.h> |
| 14 | |
| 15 | asmlinkage void loongson_lefi_sleep(unsigned long sleep_addr); |
| 16 | |
| 17 | static int lefi_pm_enter(suspend_state_t state) |
| 18 | { |
| 19 | switch (state) { |
| 20 | case PM_SUSPEND_MEM: |
| 21 | pm_set_suspend_via_firmware(); |
| 22 | loongson_lefi_sleep(sleep_addr: loongson_sysconf.suspend_addr); |
| 23 | pm_set_resume_via_firmware(); |
| 24 | return 0; |
| 25 | default: |
| 26 | return -EINVAL; |
| 27 | } |
| 28 | } |
| 29 | |
| 30 | static int lefi_pm_valid_state(suspend_state_t state) |
| 31 | { |
| 32 | switch (state) { |
| 33 | case PM_SUSPEND_MEM: |
| 34 | return !!loongson_sysconf.suspend_addr; |
| 35 | default: |
| 36 | return 0; |
| 37 | } |
| 38 | } |
| 39 | |
| 40 | static const struct platform_suspend_ops lefi_pm_ops = { |
| 41 | .valid = lefi_pm_valid_state, |
| 42 | .enter = lefi_pm_enter, |
| 43 | }; |
| 44 | |
| 45 | static int __init loongson_pm_init(void) |
| 46 | { |
| 47 | if (loongson_sysconf.fw_interface == LOONGSON_LEFI) |
| 48 | suspend_set_ops(ops: &lefi_pm_ops); |
| 49 | |
| 50 | return 0; |
| 51 | } |
| 52 | arch_initcall(loongson_pm_init); |
| 53 |