1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * loongson-specific suspend support 4 * 5 * Author: Huacai Chen <chenhuacai@loongson.cn> 6 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited 7 */ 8 #include <linux/acpi.h> 9 #include <linux/pm.h> 10 #include <linux/suspend.h> 11 12 #include <asm/loongarch.h> 13 #include <asm/loongson.h> 14 #include <asm/setup.h> 15 #include <asm/time.h> 16 #include <asm/tlbflush.h> 17 18 u64 loongarch_suspend_addr; 19 20 struct saved_registers { 21 u32 ecfg; 22 u32 euen; 23 u64 pgd; 24 u64 kpgd; 25 u32 pwctl0; 26 u32 pwctl1; 27 u64 pcpu_base; 28 }; 29 static struct saved_registers saved_regs; 30 31 void loongarch_common_suspend(void) 32 { 33 save_counter(); 34 saved_regs.pgd = csr_read64(LOONGARCH_CSR_PGDL); 35 saved_regs.kpgd = csr_read64(LOONGARCH_CSR_PGDH); 36 saved_regs.pwctl0 = csr_read32(LOONGARCH_CSR_PWCTL0); 37 saved_regs.pwctl1 = csr_read32(LOONGARCH_CSR_PWCTL1); 38 saved_regs.ecfg = csr_read32(LOONGARCH_CSR_ECFG); 39 saved_regs.euen = csr_read32(LOONGARCH_CSR_EUEN); 40 saved_regs.pcpu_base = csr_read64(PERCPU_BASE_KS); 41 42 loongarch_suspend_addr = loongson_sysconf.suspend_addr; 43 } 44 45 void loongarch_common_resume(void) 46 { 47 sync_counter(); 48 local_flush_tlb_all(); 49 csr_write64(eentry, LOONGARCH_CSR_EENTRY); 50 csr_write64(eentry, LOONGARCH_CSR_MERRENTRY); 51 csr_write64(tlbrentry, LOONGARCH_CSR_TLBRENTRY); 52 53 csr_write64(saved_regs.pgd, LOONGARCH_CSR_PGDL); 54 csr_write64(saved_regs.kpgd, LOONGARCH_CSR_PGDH); 55 csr_write32(saved_regs.pwctl0, LOONGARCH_CSR_PWCTL0); 56 csr_write32(saved_regs.pwctl1, LOONGARCH_CSR_PWCTL1); 57 csr_write32(saved_regs.ecfg, LOONGARCH_CSR_ECFG); 58 csr_write32(saved_regs.euen, LOONGARCH_CSR_EUEN); 59 csr_write64(saved_regs.pcpu_base, PERCPU_BASE_KS); 60 } 61 62 int loongarch_acpi_suspend(void) 63 { 64 enable_gpe_wakeup(); 65 enable_pci_wakeup(); 66 67 loongarch_common_suspend(); 68 69 /* processor specific suspend */ 70 loongarch_suspend_enter(); 71 72 loongarch_common_resume(); 73 74 return 0; 75 } 76