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| author | Huacai Chen <chenhuacai@loongson.cn> | 2022-12-10 17:40:15 +0300 |
|---|---|---|
| committer | Huacai Chen <chenhuacai@loongson.cn> | 2022-12-14 03:41:53 +0300 |
| commit | 366bb35a8e48198cefcd3484ac6b2374d1347873 (patch) | |
| tree | c2997ee229513d6efcafed6c2968e285a93dd539 /arch/loongarch/power/suspend.c | |
| parent | 27cab431564edba9919d1a82c2d9636d622a2493 (diff) | |
| download | linux-366bb35a8e48198cefcd3484ac6b2374d1347873.tar.xz | |
LoongArch: Add suspend (ACPI S3) support
Add suspend (Suspend To RAM, aka ACPI S3) support for LoongArch.
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'arch/loongarch/power/suspend.c')
| -rw-r--r-- | arch/loongarch/power/suspend.c | 73 |
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..5e19733e5e05 --- /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; + +static void arch_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; +} + +static void arch_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(); + + arch_common_suspend(); + + /* processor specific suspend */ + loongarch_suspend_enter(); + + arch_common_resume(); + + return 0; +} |