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 };
28 static struct saved_registers saved_regs;
29
loongarch_common_suspend(void)30 void loongarch_common_suspend(void)
31 {
32 save_counter();
33 saved_regs.pgd = csr_read64(LOONGARCH_CSR_PGDL);
34 saved_regs.kpgd = csr_read64(LOONGARCH_CSR_PGDH);
35 saved_regs.pwctl0 = csr_read32(LOONGARCH_CSR_PWCTL0);
36 saved_regs.pwctl1 = csr_read32(LOONGARCH_CSR_PWCTL1);
37 saved_regs.ecfg = csr_read32(LOONGARCH_CSR_ECFG);
38 saved_regs.euen = csr_read32(LOONGARCH_CSR_EUEN);
39
40 loongarch_suspend_addr = loongson_sysconf.suspend_addr;
41 }
42
loongarch_common_resume(void)43 void loongarch_common_resume(void)
44 {
45 sync_counter();
46 local_flush_tlb_all();
47 csr_write64(per_cpu_offset(0), PERCPU_BASE_KS);
48 csr_write64(eentry, LOONGARCH_CSR_EENTRY);
49 csr_write64(eentry, LOONGARCH_CSR_MERRENTRY);
50 csr_write64(tlbrentry, LOONGARCH_CSR_TLBRENTRY);
51
52 csr_write64(saved_regs.pgd, LOONGARCH_CSR_PGDL);
53 csr_write64(saved_regs.kpgd, LOONGARCH_CSR_PGDH);
54 csr_write32(saved_regs.pwctl0, LOONGARCH_CSR_PWCTL0);
55 csr_write32(saved_regs.pwctl1, LOONGARCH_CSR_PWCTL1);
56 csr_write32(saved_regs.ecfg, LOONGARCH_CSR_ECFG);
57 csr_write32(saved_regs.euen, LOONGARCH_CSR_EUEN);
58 }
59
loongarch_acpi_suspend(void)60 int loongarch_acpi_suspend(void)
61 {
62 enable_gpe_wakeup();
63 enable_pci_wakeup();
64
65 loongarch_common_suspend();
66
67 /* processor specific suspend */
68 loongarch_suspend_enter();
69
70 loongarch_common_resume();
71
72 return 0;
73 }
74
