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#include <asm/xip_fixup.h> 12 13 .text 14 .altmacro 15 .option norelax 16 17ENTRY(__cpu_suspend_enter) 18 /* Save registers (except A0 and T0-T6) */ 19 REG_S ra, (SUSPEND_CONTEXT_REGS + PT_RA)(a0) 20 REG_S sp, (SUSPEND_CONTEXT_REGS + PT_SP)(a0) 21 REG_S gp, (SUSPEND_CONTEXT_REGS + PT_GP)(a0) 22 REG_S tp, (SUSPEND_CONTEXT_REGS + PT_TP)(a0) 23 REG_S s0, (SUSPEND_CONTEXT_REGS + PT_S0)(a0) 24 REG_S s1, (SUSPEND_CONTEXT_REGS + PT_S1)(a0) 25 REG_S a1, (SUSPEND_CONTEXT_REGS + PT_A1)(a0) 26 REG_S a2, (SUSPEND_CONTEXT_REGS + PT_A2)(a0) 27 REG_S a3, (SUSPEND_CONTEXT_REGS + PT_A3)(a0) 28 REG_S a4, (SUSPEND_CONTEXT_REGS + PT_A4)(a0) 29 REG_S a5, (SUSPEND_CONTEXT_REGS + PT_A5)(a0) 30 REG_S a6, (SUSPEND_CONTEXT_REGS + PT_A6)(a0) 31 REG_S a7, (SUSPEND_CONTEXT_REGS + PT_A7)(a0) 32 REG_S s2, (SUSPEND_CONTEXT_REGS + PT_S2)(a0) 33 REG_S s3, (SUSPEND_CONTEXT_REGS + PT_S3)(a0) 34 REG_S s4, (SUSPEND_CONTEXT_REGS + PT_S4)(a0) 35 REG_S s5, (SUSPEND_CONTEXT_REGS + PT_S5)(a0) 36 REG_S s6, (SUSPEND_CONTEXT_REGS + PT_S6)(a0) 37 REG_S s7, (SUSPEND_CONTEXT_REGS + PT_S7)(a0) 38 REG_S s8, (SUSPEND_CONTEXT_REGS + PT_S8)(a0) 39 REG_S s9, (SUSPEND_CONTEXT_REGS + PT_S9)(a0) 40 REG_S s10, (SUSPEND_CONTEXT_REGS + PT_S10)(a0) 41 REG_S s11, (SUSPEND_CONTEXT_REGS + PT_S11)(a0) 42 43 /* Save CSRs */ 44 csrr t0, CSR_EPC 45 REG_S t0, (SUSPEND_CONTEXT_REGS + PT_EPC)(a0) 46 csrr t0, CSR_STATUS 47 REG_S t0, (SUSPEND_CONTEXT_REGS + PT_STATUS)(a0) 48 csrr t0, CSR_TVAL 49 REG_S t0, (SUSPEND_CONTEXT_REGS + PT_BADADDR)(a0) 50 csrr t0, CSR_CAUSE 51 REG_S t0, (SUSPEND_CONTEXT_REGS + PT_CAUSE)(a0) 52 53 /* Return non-zero value */ 54 li a0, 1 55 56 /* Return to C code */ 57 ret 58END(__cpu_suspend_enter) 59 60ENTRY(__cpu_resume_enter) 61 /* Load the global pointer */ 62 .option push 63 .option norelax 64 la gp, __global_pointer$ 65 .option pop 66 67#ifdef CONFIG_MMU 68 /* Save A0 and A1 */ 69 add t0, a0, zero 70 add t1, a1, zero 71 72 /* Enable MMU */ 73 la a0, swapper_pg_dir 74 XIP_FIXUP_OFFSET a0 75 call relocate_enable_mmu 76 77 /* Restore A0 and A1 */ 78 add a0, t0, zero 79 add a1, t1, zero 80#endif 81 82 /* Make A0 point to suspend context */ 83 add a0, a1, zero 84 85 /* Restore CSRs */ 86 REG_L t0, (SUSPEND_CONTEXT_REGS + PT_EPC)(a0) 87 csrw CSR_EPC, t0 88 REG_L t0, (SUSPEND_CONTEXT_REGS + PT_STATUS)(a0) 89 csrw CSR_STATUS, t0 90 REG_L t0, (SUSPEND_CONTEXT_REGS + PT_BADADDR)(a0) 91 csrw CSR_TVAL, t0 92 REG_L t0, (SUSPEND_CONTEXT_REGS + PT_CAUSE)(a0) 93 csrw CSR_CAUSE, t0 94 95 /* Restore registers (except A0 and T0-T6) */ 96 REG_L ra, (SUSPEND_CONTEXT_REGS + PT_RA)(a0) 97 REG_L sp, (SUSPEND_CONTEXT_REGS + PT_SP)(a0) 98 REG_L gp, (SUSPEND_CONTEXT_REGS + PT_GP)(a0) 99 REG_L tp, (SUSPEND_CONTEXT_REGS + PT_TP)(a0) 100 REG_L s0, (SUSPEND_CONTEXT_REGS + PT_S0)(a0) 101 REG_L s1, (SUSPEND_CONTEXT_REGS + PT_S1)(a0) 102 REG_L a1, (SUSPEND_CONTEXT_REGS + PT_A1)(a0) 103 REG_L a2, (SUSPEND_CONTEXT_REGS + PT_A2)(a0) 104 REG_L a3, (SUSPEND_CONTEXT_REGS + PT_A3)(a0) 105 REG_L a4, (SUSPEND_CONTEXT_REGS + PT_A4)(a0) 106 REG_L a5, (SUSPEND_CONTEXT_REGS + PT_A5)(a0) 107 REG_L a6, (SUSPEND_CONTEXT_REGS + PT_A6)(a0) 108 REG_L a7, (SUSPEND_CONTEXT_REGS + PT_A7)(a0) 109 REG_L s2, (SUSPEND_CONTEXT_REGS + PT_S2)(a0) 110 REG_L s3, (SUSPEND_CONTEXT_REGS + PT_S3)(a0) 111 REG_L s4, (SUSPEND_CONTEXT_REGS + PT_S4)(a0) 112 REG_L s5, (SUSPEND_CONTEXT_REGS + PT_S5)(a0) 113 REG_L s6, (SUSPEND_CONTEXT_REGS + PT_S6)(a0) 114 REG_L s7, (SUSPEND_CONTEXT_REGS + PT_S7)(a0) 115 REG_L s8, (SUSPEND_CONTEXT_REGS + PT_S8)(a0) 116 REG_L s9, (SUSPEND_CONTEXT_REGS + PT_S9)(a0) 117 REG_L s10, (SUSPEND_CONTEXT_REGS + PT_S10)(a0) 118 REG_L s11, (SUSPEND_CONTEXT_REGS + PT_S11)(a0) 119 120 /* Return zero value */ 121 add a0, zero, zero 122 123 /* Return to C code */ 124 ret 125END(__cpu_resume_enter) 126