1/* SPDX-License-Identifier: GPL-2.0-only */ 2/* 3 * Copyright (c) 2021 Western Digital Corporation or its affiliates. 4 * Copyright (c) 2022 Ventana Micro Systems Inc. 5 */ 6 7#include <linux/linkage.h> 8#include <linux/cfi_types.h> 9#include <asm/asm.h> 10#include <asm/asm-offsets.h> 11#include <asm/assembler.h> 12#include <asm/csr.h> 13 14 .text 15 .altmacro 16 .option norelax 17 18SYM_FUNC_START(__cpu_suspend_enter) 19 /* Save registers (except A0 and T0-T6) */ 20 REG_S ra, (SUSPEND_CONTEXT_REGS + PT_RA)(a0) 21 REG_S sp, (SUSPEND_CONTEXT_REGS + PT_SP)(a0) 22 REG_S gp, (SUSPEND_CONTEXT_REGS + PT_GP)(a0) 23 REG_S tp, (SUSPEND_CONTEXT_REGS + PT_TP)(a0) 24 REG_S s0, (SUSPEND_CONTEXT_REGS + PT_S0)(a0) 25 REG_S s1, (SUSPEND_CONTEXT_REGS + PT_S1)(a0) 26 REG_S a1, (SUSPEND_CONTEXT_REGS + PT_A1)(a0) 27 REG_S a2, (SUSPEND_CONTEXT_REGS + PT_A2)(a0) 28 REG_S a3, (SUSPEND_CONTEXT_REGS + PT_A3)(a0) 29 REG_S a4, (SUSPEND_CONTEXT_REGS + PT_A4)(a0) 30 REG_S a5, (SUSPEND_CONTEXT_REGS + PT_A5)(a0) 31 REG_S a6, (SUSPEND_CONTEXT_REGS + PT_A6)(a0) 32 REG_S a7, (SUSPEND_CONTEXT_REGS + PT_A7)(a0) 33 REG_S s2, (SUSPEND_CONTEXT_REGS + PT_S2)(a0) 34 REG_S s3, (SUSPEND_CONTEXT_REGS + PT_S3)(a0) 35 REG_S s4, (SUSPEND_CONTEXT_REGS + PT_S4)(a0) 36 REG_S s5, (SUSPEND_CONTEXT_REGS + PT_S5)(a0) 37 REG_S s6, (SUSPEND_CONTEXT_REGS + PT_S6)(a0) 38 REG_S s7, (SUSPEND_CONTEXT_REGS + PT_S7)(a0) 39 REG_S s8, (SUSPEND_CONTEXT_REGS + PT_S8)(a0) 40 REG_S s9, (SUSPEND_CONTEXT_REGS + PT_S9)(a0) 41 REG_S s10, (SUSPEND_CONTEXT_REGS + PT_S10)(a0) 42 REG_S s11, (SUSPEND_CONTEXT_REGS + PT_S11)(a0) 43 44 /* Save CSRs */ 45 csrr t0, CSR_EPC 46 REG_S t0, (SUSPEND_CONTEXT_REGS + PT_EPC)(a0) 47 csrr t0, CSR_STATUS 48 REG_S t0, (SUSPEND_CONTEXT_REGS + PT_STATUS)(a0) 49 csrr t0, CSR_TVAL 50 REG_S t0, (SUSPEND_CONTEXT_REGS + PT_BADADDR)(a0) 51 csrr t0, CSR_CAUSE 52 REG_S t0, (SUSPEND_CONTEXT_REGS + PT_CAUSE)(a0) 53 54 /* Return non-zero value */ 55 li a0, 1 56 57 /* Return to C code */ 58 ret 59SYM_FUNC_END(__cpu_suspend_enter) 60 61SYM_TYPED_FUNC_START(__cpu_resume_enter) 62 /* Load the global pointer */ 63 load_global_pointer 64 65#ifdef CONFIG_MMU 66 /* Save A0 and A1 */ 67 add t0, a0, zero 68 add t1, a1, zero 69 70 /* Enable MMU */ 71 la a0, swapper_pg_dir 72 call relocate_enable_mmu 73 74 /* Restore A0 and A1 */ 75 add a0, t0, zero 76 add a1, t1, zero 77#endif 78 79 /* Make A0 point to suspend context */ 80 add a0, a1, zero 81 82 /* Restore CSRs */ 83 suspend_restore_csrs 84 85 /* Restore registers (except A0 and T0-T6) */ 86 suspend_restore_regs 87 88 /* Return zero value */ 89 add a0, zero, zero 90 91 /* Return to C code */ 92 ret 93SYM_FUNC_END(__cpu_resume_enter) 94