1// SPDX-License-Identifier: GPL-2.0
 2// Copyright (C) 2008-2017 Andes Technology Corporation
 3
 4#include <linux/init.h>
 5#include <linux/suspend.h>
 6#include <linux/device.h>
 7#include <linux/printk.h>
 8#include <asm/suspend.h>
 9#include <nds32_intrinsic.h>
10
11unsigned int resume_addr;
12unsigned int *phy_addr_sp_tmp;
13
14static void nds32_suspend2ram(void)
15{
16	pgd_t *pgdv;
17	pud_t *pudv;
18	pmd_t *pmdv;
19	pte_t *ptev;
20
21	pgdv = (pgd_t *)__va((__nds32__mfsr(NDS32_SR_L1_PPTB) &
22		L1_PPTB_mskBASE)) + pgd_index((unsigned int)cpu_resume);
23
24	pudv = pud_offset(pgdv, (unsigned int)cpu_resume);
25	pmdv = pmd_offset(pudv, (unsigned int)cpu_resume);
26	ptev = pte_offset_map(pmdv, (unsigned int)cpu_resume);
27
28	resume_addr = ((*ptev) & TLB_DATA_mskPPN)
29			| ((unsigned int)cpu_resume & 0x00000fff);
30
31	suspend2ram();
32}
33
34static void nds32_suspend_cpu(void)
35{
36	while (!(__nds32__mfsr(NDS32_SR_INT_PEND) & wake_mask))
37		__asm__ volatile ("standby no_wake_grant\n\t");
38}
39
40static int nds32_pm_valid(suspend_state_t state)
41{
42	switch (state) {
43	case PM_SUSPEND_ON:
44	case PM_SUSPEND_STANDBY:
45	case PM_SUSPEND_MEM:
46		return 1;
47	default:
48		return 0;
49	}
50}
51
52static int nds32_pm_enter(suspend_state_t state)
53{
54	pr_debug("%s:state:%d\n", __func__, state);
55	switch (state) {
56	case PM_SUSPEND_STANDBY:
57		nds32_suspend_cpu();
58		return 0;
59	case PM_SUSPEND_MEM:
60		nds32_suspend2ram();
61		return 0;
62	default:
63		return -EINVAL;
64	}
65}
66
67static const struct platform_suspend_ops nds32_pm_ops = {
68	.valid = nds32_pm_valid,
69	.enter = nds32_pm_enter,
70};
71
72static int __init nds32_pm_init(void)
73{
74	pr_debug("Enter %s\n", __func__);
75	suspend_set_ops(&nds32_pm_ops);
76	return 0;
77}
78late_initcall(nds32_pm_init);