Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/arch/nds32/kernel/pm.c b/arch/nds32/kernel/pm.c
new file mode 100644
index 0000000..ffa8040
--- /dev/null
+++ b/arch/nds32/kernel/pm.c
@@ -0,0 +1,78 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2008-2017 Andes Technology Corporation
+
+#include <linux/init.h>
+#include <linux/suspend.h>
+#include <linux/device.h>
+#include <linux/printk.h>
+#include <asm/suspend.h>
+#include <nds32_intrinsic.h>
+
+unsigned int resume_addr;
+unsigned int *phy_addr_sp_tmp;
+
+static void nds32_suspend2ram(void)
+{
+ pgd_t *pgdv;
+ pud_t *pudv;
+ pmd_t *pmdv;
+ pte_t *ptev;
+
+ pgdv = (pgd_t *)__va((__nds32__mfsr(NDS32_SR_L1_PPTB) &
+ L1_PPTB_mskBASE)) + pgd_index((unsigned int)cpu_resume);
+
+ pudv = pud_offset(pgdv, (unsigned int)cpu_resume);
+ pmdv = pmd_offset(pudv, (unsigned int)cpu_resume);
+ ptev = pte_offset_map(pmdv, (unsigned int)cpu_resume);
+
+ resume_addr = ((*ptev) & TLB_DATA_mskPPN)
+ | ((unsigned int)cpu_resume & 0x00000fff);
+
+ suspend2ram();
+}
+
+static void nds32_suspend_cpu(void)
+{
+ while (!(__nds32__mfsr(NDS32_SR_INT_PEND) & wake_mask))
+ __asm__ volatile ("standby no_wake_grant\n\t");
+}
+
+static int nds32_pm_valid(suspend_state_t state)
+{
+ switch (state) {
+ case PM_SUSPEND_ON:
+ case PM_SUSPEND_STANDBY:
+ case PM_SUSPEND_MEM:
+ return 1;
+ default:
+ return 0;
+ }
+}
+
+static int nds32_pm_enter(suspend_state_t state)
+{
+ pr_debug("%s:state:%d\n", __func__, state);
+ switch (state) {
+ case PM_SUSPEND_STANDBY:
+ nds32_suspend_cpu();
+ return 0;
+ case PM_SUSPEND_MEM:
+ nds32_suspend2ram();
+ return 0;
+ default:
+ return -EINVAL;
+ }
+}
+
+static const struct platform_suspend_ops nds32_pm_ops = {
+ .valid = nds32_pm_valid,
+ .enter = nds32_pm_enter,
+};
+
+static int __init nds32_pm_init(void)
+{
+ pr_debug("Enter %s\n", __func__);
+ suspend_set_ops(&nds32_pm_ops);
+ return 0;
+}
+late_initcall(nds32_pm_init);