1 files changed, 73 insertions, 0 deletions
diff --git a/arch/loongarch/power/suspend.c b/arch/loongarch/power/suspend.c
new file mode 100644
index 000000000000..166d9e06a64b
--- /dev/null
+++ b/arch/loongarch/power/suspend.c
@@ -0,0 +1,73 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * loongson-specific suspend support
+ *
+ * Author: Huacai Chen <chenhuacai@loongson.cn>
+ * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
+ */
+#include <linux/acpi.h>
+#include <linux/pm.h>
+#include <linux/suspend.h>
+
+#include <asm/loongarch.h>
+#include <asm/loongson.h>
+#include <asm/setup.h>
+#include <asm/time.h>
+#include <asm/tlbflush.h>
+
+u64 loongarch_suspend_addr;
+
+struct saved_registers {
+	u32 ecfg;
+	u32 euen;
+	u64 pgd;
+	u64 kpgd;
+	u32 pwctl0;
+	u32 pwctl1;
+};
+static struct saved_registers saved_regs;
+
+void loongarch_common_suspend(void)
+{
+	save_counter();
+	saved_regs.pgd = csr_read64(LOONGARCH_CSR_PGDL);
+	saved_regs.kpgd = csr_read64(LOONGARCH_CSR_PGDH);
+	saved_regs.pwctl0 = csr_read32(LOONGARCH_CSR_PWCTL0);
+	saved_regs.pwctl1 = csr_read32(LOONGARCH_CSR_PWCTL1);
+	saved_regs.ecfg = csr_read32(LOONGARCH_CSR_ECFG);
+	saved_regs.euen = csr_read32(LOONGARCH_CSR_EUEN);
+
+	loongarch_suspend_addr = loongson_sysconf.suspend_addr;
+}
+
+void loongarch_common_resume(void)
+{
+	sync_counter();
+	local_flush_tlb_all();
+	csr_write64(per_cpu_offset(0), PERCPU_BASE_KS);
+	csr_write64(eentry, LOONGARCH_CSR_EENTRY);
+	csr_write64(eentry, LOONGARCH_CSR_MERRENTRY);
+	csr_write64(tlbrentry, LOONGARCH_CSR_TLBRENTRY);
+
+	csr_write64(saved_regs.pgd, LOONGARCH_CSR_PGDL);
+	csr_write64(saved_regs.kpgd, LOONGARCH_CSR_PGDH);
+	csr_write32(saved_regs.pwctl0, LOONGARCH_CSR_PWCTL0);
+	csr_write32(saved_regs.pwctl1, LOONGARCH_CSR_PWCTL1);
+	csr_write32(saved_regs.ecfg, LOONGARCH_CSR_ECFG);
+	csr_write32(saved_regs.euen, LOONGARCH_CSR_EUEN);
+}
+
+int loongarch_acpi_suspend(void)
+{
+	enable_gpe_wakeup();
+	enable_pci_wakeup();
+
+	loongarch_common_suspend();
+
+	/* processor specific suspend */
+	loongarch_suspend_enter();
+
+	loongarch_common_resume();
+
+	return 0;
+}