79 lines
1.6 KiB
C
79 lines
1.6 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2008-2017 Andes Technology Corporation
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#include <linux/init.h>
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#include <linux/suspend.h>
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#include <linux/device.h>
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#include <linux/printk.h>
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#include <asm/suspend.h>
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#include <nds32_intrinsic.h>
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unsigned int resume_addr;
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unsigned int *phy_addr_sp_tmp;
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static void nds32_suspend2ram(void)
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{
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pgd_t *pgdv;
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pud_t *pudv;
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pmd_t *pmdv;
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pte_t *ptev;
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pgdv = (pgd_t *)__va((__nds32__mfsr(NDS32_SR_L1_PPTB) &
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L1_PPTB_mskBASE)) + pgd_index((unsigned int)cpu_resume);
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pudv = pud_offset(pgdv, (unsigned int)cpu_resume);
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pmdv = pmd_offset(pudv, (unsigned int)cpu_resume);
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ptev = pte_offset_map(pmdv, (unsigned int)cpu_resume);
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resume_addr = ((*ptev) & TLB_DATA_mskPPN)
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| ((unsigned int)cpu_resume & 0x00000fff);
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suspend2ram();
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}
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static void nds32_suspend_cpu(void)
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{
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while (!(__nds32__mfsr(NDS32_SR_INT_PEND) & wake_mask))
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__asm__ volatile ("standby no_wake_grant\n\t");
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}
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static int nds32_pm_valid(suspend_state_t state)
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{
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switch (state) {
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case PM_SUSPEND_ON:
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case PM_SUSPEND_STANDBY:
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case PM_SUSPEND_MEM:
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return 1;
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default:
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return 0;
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}
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}
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static int nds32_pm_enter(suspend_state_t state)
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{
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pr_debug("%s:state:%d\n", __func__, state);
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switch (state) {
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case PM_SUSPEND_STANDBY:
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nds32_suspend_cpu();
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return 0;
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case PM_SUSPEND_MEM:
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nds32_suspend2ram();
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return 0;
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default:
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return -EINVAL;
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}
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}
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static const struct platform_suspend_ops nds32_pm_ops = {
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.valid = nds32_pm_valid,
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.enter = nds32_pm_enter,
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};
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static int __init nds32_pm_init(void)
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{
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pr_debug("Enter %s\n", __func__);
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suspend_set_ops(&nds32_pm_ops);
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return 0;
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}
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late_initcall(nds32_pm_init);
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