1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright (c) 2021 Western Digital Corporat
4 * Copyright (c) 2022 Ventana Micro Systems In
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
19 SYM_FUNC_START(__cpu_suspend_enter)
20 /* Save registers (except A0 and T0-T6
21 REG_S ra, (SUSPEND_CONTEXT_REGS + PT
22 REG_S sp, (SUSPEND_CONTEXT_REGS + PT
23 REG_S gp, (SUSPEND_CONTEXT_REGS + PT
24 REG_S tp, (SUSPEND_CONTEXT_REGS + PT
25 REG_S s0, (SUSPEND_CONTEXT_REGS + PT
26 REG_S s1, (SUSPEND_CONTEXT_REGS + PT
27 REG_S a1, (SUSPEND_CONTEXT_REGS + PT
28 REG_S a2, (SUSPEND_CONTEXT_REGS + PT
29 REG_S a3, (SUSPEND_CONTEXT_REGS + PT
30 REG_S a4, (SUSPEND_CONTEXT_REGS + PT
31 REG_S a5, (SUSPEND_CONTEXT_REGS + PT
32 REG_S a6, (SUSPEND_CONTEXT_REGS + PT
33 REG_S a7, (SUSPEND_CONTEXT_REGS + PT
34 REG_S s2, (SUSPEND_CONTEXT_REGS + PT
35 REG_S s3, (SUSPEND_CONTEXT_REGS + PT
36 REG_S s4, (SUSPEND_CONTEXT_REGS + PT
37 REG_S s5, (SUSPEND_CONTEXT_REGS + PT
38 REG_S s6, (SUSPEND_CONTEXT_REGS + PT
39 REG_S s7, (SUSPEND_CONTEXT_REGS + PT
40 REG_S s8, (SUSPEND_CONTEXT_REGS + PT
41 REG_S s9, (SUSPEND_CONTEXT_REGS + PT
42 REG_S s10, (SUSPEND_CONTEXT_REGS + P
43 REG_S s11, (SUSPEND_CONTEXT_REGS + P
44
45 /* Save CSRs */
46 csrr t0, CSR_EPC
47 REG_S t0, (SUSPEND_CONTEXT_REGS + PT
48 csrr t0, CSR_STATUS
49 REG_S t0, (SUSPEND_CONTEXT_REGS + PT
50 csrr t0, CSR_TVAL
51 REG_S t0, (SUSPEND_CONTEXT_REGS + PT
52 csrr t0, CSR_CAUSE
53 REG_S t0, (SUSPEND_CONTEXT_REGS + PT
54
55 /* Return non-zero value */
56 li a0, 1
57
58 /* Return to C code */
59 ret
60 SYM_FUNC_END(__cpu_suspend_enter)
61
62 SYM_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
88 suspend_restore_regs
89
90 /* Return zero value */
91 add a0, zero, zero
92
93 /* Return to C code */
94 ret
95 SYM_FUNC_END(__cpu_resume_enter)
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