// 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; u64 pcpu_base; }; 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); saved_regs.pcpu_base = csr_read64(PERCPU_BASE_KS); loongarch_suspend_addr = loongson_sysconf.suspend_addr; } void loongarch_common_resume(void) { sync_counter(); local_flush_tlb_all(); 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); csr_write64(saved_regs.pcpu_base, PERCPU_BASE_KS); } 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; }