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-rw-r--r--arch/loongarch/power/platform.c57
1 files changed, 57 insertions, 0 deletions
diff --git a/arch/loongarch/power/platform.c b/arch/loongarch/power/platform.c
new file mode 100644
index 000000000000..3ea8e07aa225
--- /dev/null
+++ b/arch/loongarch/power/platform.c
@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Author: Huacai Chen <chenhuacai@loongson.cn>
+ * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
+ */
+#include <linux/acpi.h>
+#include <linux/platform_device.h>
+
+#include <asm/bootinfo.h>
+#include <asm/loongson.h>
+
+void enable_gpe_wakeup(void)
+{
+ if (acpi_disabled)
+ return;
+
+ if (acpi_gbl_reduced_hardware)
+ return;
+
+ acpi_enable_all_wakeup_gpes();
+}
+
+void enable_pci_wakeup(void)
+{
+ if (acpi_disabled)
+ return;
+
+ if (acpi_gbl_reduced_hardware)
+ return;
+
+ acpi_write_bit_register(ACPI_BITREG_PCIEXP_WAKE_STATUS, 1);
+
+ if (acpi_gbl_FADT.flags & ACPI_FADT_PCI_EXPRESS_WAKE)
+ acpi_write_bit_register(ACPI_BITREG_PCIEXP_WAKE_DISABLE, 0);
+}
+
+static int __init loongson3_acpi_suspend_init(void)
+{
+#ifdef CONFIG_ACPI
+ acpi_status status;
+ uint64_t suspend_addr = 0;
+
+ if (acpi_disabled || acpi_gbl_reduced_hardware)
+ return 0;
+
+ acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
+ status = acpi_evaluate_integer(NULL, "\\SADR", NULL, &suspend_addr);
+ if (ACPI_FAILURE(status) || !suspend_addr) {
+ pr_err("ACPI S3 is not support!\n");
+ return -1;
+ }
+ loongson_sysconf.suspend_addr = (u64)phys_to_virt(PHYSADDR(suspend_addr));
+#endif
+ return 0;
+}
+
+device_initcall(loongson3_acpi_suspend_init);