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 <asm/asm.h> 9#include <asm/asm-offsets.h> 10#include <asm/csr.h> 11 12 .text 13 .altmacro 14 .option norelax 15 16ENTRY(__cpu_suspend_enter) 17 /* Save registers (except A0 and T0-T6) */ 18 REG_S ra, (SUSPEND_CONTEXT_REGS + PT_RA)(a0) 19 REG_S sp, (SUSPEND_CONTEXT_REGS + PT_SP)(a0) 20 REG_S gp, (SUSPEND_CONTEXT_REGS + PT_GP)(a0) 21 REG_S tp, (SUSPEND_CONTEXT_REGS + PT_TP)(a0) 22 REG_S s0, (SUSPEND_CONTEXT_REGS + PT_S0)(a0) 23 REG_S s1, (SUSPEND_CONTEXT_REGS + PT_S1)(a0) 24 REG_S a1, (SUSPEND_CONTEXT_REGS + PT_A1)(a0) 25 REG_S a2, (SUSPEND_CONTEXT_REGS + PT_A2)(a0) 26 REG_S a3, (SUSPEND_CONTEXT_REGS + PT_A3)(a0) 27 REG_S a4, (SUSPEND_CONTEXT_REGS + PT_A4)(a0) 28 REG_S a5, (SUSPEND_CONTEXT_REGS + PT_A5)(a0) 29 REG_S a6, (SUSPEND_CONTEXT_REGS + PT_A6)(a0) 30 REG_S a7, (SUSPEND_CONTEXT_REGS + PT_A7)(a0) 31 REG_S s2, (SUSPEND_CONTEXT_REGS + PT_S2)(a0) 32 REG_S s3, (SUSPEND_CONTEXT_REGS + PT_S3)(a0) 33 REG_S s4, (SUSPEND_CONTEXT_REGS + PT_S4)(a0) 34 REG_S s5, (SUSPEND_CONTEXT_REGS + PT_S5)(a0) 35 REG_S s6, (SUSPEND_CONTEXT_REGS + PT_S6)(a0) 36 REG_S s7, (SUSPEND_CONTEXT_REGS + PT_S7)(a0) 37 REG_S s8, (SUSPEND_CONTEXT_REGS + PT_S8)(a0) 38 REG_S s9, (SUSPEND_CONTEXT_REGS + PT_S9)(a0) 39 REG_S s10, (SUSPEND_CONTEXT_REGS + PT_S10)(a0) 40 REG_S s11, (SUSPEND_CONTEXT_REGS + PT_S11)(a0) 41 42 /* Save CSRs */ 43 csrr t0, CSR_EPC 44 REG_S t0, (SUSPEND_CONTEXT_REGS + PT_EPC)(a0) 45 csrr t0, CSR_STATUS 46 REG_S t0, (SUSPEND_CONTEXT_REGS + PT_STATUS)(a0) 47 csrr t0, CSR_TVAL 48 REG_S t0, (SUSPEND_CONTEXT_REGS + PT_BADADDR)(a0) 49 csrr t0, CSR_CAUSE 50 REG_S t0, (SUSPEND_CONTEXT_REGS + PT_CAUSE)(a0) 51 52 /* Return non-zero value */ 53 li a0, 1 54 55 /* Return to C code */ 56 ret 57END(__cpu_suspend_enter) 58 59ENTRY(__cpu_resume_enter) 60 /* Load the global pointer */ 61 .option push 62 .option norelax 63 la gp, __global_pointer$ 64 .option pop 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 REG_L t0, (SUSPEND_CONTEXT_REGS + PT_EPC)(a0) 86 csrw CSR_EPC, t0 87 REG_L t0, (SUSPEND_CONTEXT_REGS + PT_STATUS)(a0) 88 csrw CSR_STATUS, t0 89 REG_L t0, (SUSPEND_CONTEXT_REGS + PT_BADADDR)(a0) 90 csrw CSR_TVAL, t0 91 REG_L t0, (SUSPEND_CONTEXT_REGS + PT_CAUSE)(a0) 92 csrw CSR_CAUSE, t0 93 94 /* Restore registers (except A0 and T0-T6) */ 95 REG_L ra, (SUSPEND_CONTEXT_REGS + PT_RA)(a0) 96 REG_L sp, (SUSPEND_CONTEXT_REGS + PT_SP)(a0) 97 REG_L gp, (SUSPEND_CONTEXT_REGS + PT_GP)(a0) 98 REG_L tp, (SUSPEND_CONTEXT_REGS + PT_TP)(a0) 99 REG_L s0, (SUSPEND_CONTEXT_REGS + PT_S0)(a0) 100 REG_L s1, (SUSPEND_CONTEXT_REGS + PT_S1)(a0) 101 REG_L a1, (SUSPEND_CONTEXT_REGS + PT_A1)(a0) 102 REG_L a2, (SUSPEND_CONTEXT_REGS + PT_A2)(a0) 103 REG_L a3, (SUSPEND_CONTEXT_REGS + PT_A3)(a0) 104 REG_L a4, (SUSPEND_CONTEXT_REGS + PT_A4)(a0) 105 REG_L a5, (SUSPEND_CONTEXT_REGS + PT_A5)(a0) 106 REG_L a6, (SUSPEND_CONTEXT_REGS + PT_A6)(a0) 107 REG_L a7, (SUSPEND_CONTEXT_REGS + PT_A7)(a0) 108 REG_L s2, (SUSPEND_CONTEXT_REGS + PT_S2)(a0) 109 REG_L s3, (SUSPEND_CONTEXT_REGS + PT_S3)(a0) 110 REG_L s4, (SUSPEND_CONTEXT_REGS + PT_S4)(a0) 111 REG_L s5, (SUSPEND_CONTEXT_REGS + PT_S5)(a0) 112 REG_L s6, (SUSPEND_CONTEXT_REGS + PT_S6)(a0) 113 REG_L s7, (SUSPEND_CONTEXT_REGS + PT_S7)(a0) 114 REG_L s8, (SUSPEND_CONTEXT_REGS + PT_S8)(a0) 115 REG_L s9, (SUSPEND_CONTEXT_REGS + PT_S9)(a0) 116 REG_L s10, (SUSPEND_CONTEXT_REGS + PT_S10)(a0) 117 REG_L s11, (SUSPEND_CONTEXT_REGS + PT_S11)(a0) 118 119 /* Return zero value */ 120 add a0, zero, zero 121 122 /* Return to C code */ 123 ret 124END(__cpu_resume_enter) 125