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#include <asm/xip_fixup.h> 14 15 .text 16 .altmacro 17 .option norelax 18 19SYM_FUNC_START(__cpu_suspend_enter) 20 /* Save registers (except A0 and T0-T6) */ 21 REG_S ra, (SUSPEND_CONTEXT_REGS + PT_RA)(a0) 22 REG_S sp, (SUSPEND_CONTEXT_REGS + PT_SP)(a0) 23 REG_S gp, (SUSPEND_CONTEXT_REGS + PT_GP)(a0) 24 REG_S tp, (SUSPEND_CONTEXT_REGS + PT_TP)(a0) 25 REG_S s0, (SUSPEND_CONTEXT_REGS + PT_S0)(a0) 26 REG_S s1, (SUSPEND_CONTEXT_REGS + PT_S1)(a0) 27 REG_S a1, (SUSPEND_CONTEXT_REGS + PT_A1)(a0) 28 REG_S a2, (SUSPEND_CONTEXT_REGS + PT_A2)(a0) 29 REG_S a3, (SUSPEND_CONTEXT_REGS + PT_A3)(a0) 30 REG_S a4, (SUSPEND_CONTEXT_REGS + PT_A4)(a0) 31 REG_S a5, (SUSPEND_CONTEXT_REGS + PT_A5)(a0) 32 REG_S a6, (SUSPEND_CONTEXT_REGS + PT_A6)(a0) 33 REG_S a7, (SUSPEND_CONTEXT_REGS + PT_A7)(a0) 34 REG_S s2, (SUSPEND_CONTEXT_REGS + PT_S2)(a0) 35 REG_S s3, (SUSPEND_CONTEXT_REGS + PT_S3)(a0) 36 REG_S s4, (SUSPEND_CONTEXT_REGS + PT_S4)(a0) 37 REG_S s5, (SUSPEND_CONTEXT_REGS + PT_S5)(a0) 38 REG_S s6, (SUSPEND_CONTEXT_REGS + PT_S6)(a0) 39 REG_S s7, (SUSPEND_CONTEXT_REGS + PT_S7)(a0) 40 REG_S s8, (SUSPEND_CONTEXT_REGS + PT_S8)(a0) 41 REG_S s9, (SUSPEND_CONTEXT_REGS + PT_S9)(a0) 42 REG_S s10, (SUSPEND_CONTEXT_REGS + PT_S10)(a0) 43 REG_S s11, (SUSPEND_CONTEXT_REGS + PT_S11)(a0) 44 45 /* Save CSRs */ 46 csrr t0, CSR_EPC 47 REG_S t0, (SUSPEND_CONTEXT_REGS + PT_EPC)(a0) 48 csrr t0, CSR_STATUS 49 REG_S t0, (SUSPEND_CONTEXT_REGS + PT_STATUS)(a0) 50 csrr t0, CSR_TVAL 51 REG_S t0, (SUSPEND_CONTEXT_REGS + PT_BADADDR)(a0) 52 csrr t0, CSR_CAUSE 53 REG_S t0, (SUSPEND_CONTEXT_REGS + PT_CAUSE)(a0) 54 55 /* Return non-zero value */ 56 li a0, 1 57 58 /* Return to C code */ 59 ret 60SYM_FUNC_END(__cpu_suspend_enter) 61 62SYM_TYPED_FUNC_START(__cpu_resume_enter) 63 /* Load the global pointer */ 64 load_global_pointer 65 66#ifdef CONFIG_MMU 67 /* Save A0 and A1 */ 68 add t0, a0, zero 69 add t1, a1, zero 70 71 /* Enable MMU */ 72 la a0, swapper_pg_dir 73 XIP_FIXUP_OFFSET a0 74 call relocate_enable_mmu 75 76 /* Restore A0 and A1 */ 77 add a0, t0, zero 78 add a1, t1, zero 79#endif 80 81 /* Make A0 point to suspend context */ 82 add a0, a1, zero 83 84 /* Restore CSRs */ 85 suspend_restore_csrs 86 87 /* Restore registers (except A0 and T0-T6) */ 88 suspend_restore_regs 89 90 /* Return zero value */ 91 add a0, zero, zero 92 93 /* Return to C code */ 94 ret 95SYM_FUNC_END(__cpu_resume_enter) 96