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Diffstat (limited to 'arch/mips/alchemy/common/sleeper.S')
-rw-r--r-- | arch/mips/alchemy/common/sleeper.S | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/arch/mips/alchemy/common/sleeper.S b/arch/mips/alchemy/common/sleeper.S new file mode 100644 index 000000000000..3006e270c8bc --- /dev/null +++ b/arch/mips/alchemy/common/sleeper.S | |||
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1 | /* | ||
2 | * Copyright 2002 Embedded Edge, LLC | ||
3 | * Author: dan@embeddededge.com | ||
4 | * | ||
5 | * Sleep helper for Au1xxx sleep mode. | ||
6 | * | ||
7 | * This program is free software; you can redistribute it and/or modify it | ||
8 | * under the terms of the GNU General Public License as published by the | ||
9 | * Free Software Foundation; either version 2 of the License, or (at your | ||
10 | * option) any later version. | ||
11 | */ | ||
12 | |||
13 | #include <asm/asm.h> | ||
14 | #include <asm/mipsregs.h> | ||
15 | #include <asm/regdef.h> | ||
16 | #include <asm/stackframe.h> | ||
17 | |||
18 | .text | ||
19 | .set macro | ||
20 | .set noat | ||
21 | .align 5 | ||
22 | |||
23 | /* Save all of the processor general registers and go to sleep. | ||
24 | * A wakeup condition will get us back here to restore the registers. | ||
25 | */ | ||
26 | LEAF(save_and_sleep) | ||
27 | |||
28 | subu sp, PT_SIZE | ||
29 | sw $1, PT_R1(sp) | ||
30 | sw $2, PT_R2(sp) | ||
31 | sw $3, PT_R3(sp) | ||
32 | sw $4, PT_R4(sp) | ||
33 | sw $5, PT_R5(sp) | ||
34 | sw $6, PT_R6(sp) | ||
35 | sw $7, PT_R7(sp) | ||
36 | sw $8, PT_R8(sp) | ||
37 | sw $9, PT_R9(sp) | ||
38 | sw $10, PT_R10(sp) | ||
39 | sw $11, PT_R11(sp) | ||
40 | sw $12, PT_R12(sp) | ||
41 | sw $13, PT_R13(sp) | ||
42 | sw $14, PT_R14(sp) | ||
43 | sw $15, PT_R15(sp) | ||
44 | sw $16, PT_R16(sp) | ||
45 | sw $17, PT_R17(sp) | ||
46 | sw $18, PT_R18(sp) | ||
47 | sw $19, PT_R19(sp) | ||
48 | sw $20, PT_R20(sp) | ||
49 | sw $21, PT_R21(sp) | ||
50 | sw $22, PT_R22(sp) | ||
51 | sw $23, PT_R23(sp) | ||
52 | sw $24, PT_R24(sp) | ||
53 | sw $25, PT_R25(sp) | ||
54 | sw $26, PT_R26(sp) | ||
55 | sw $27, PT_R27(sp) | ||
56 | sw $28, PT_R28(sp) | ||
57 | sw $29, PT_R29(sp) | ||
58 | sw $30, PT_R30(sp) | ||
59 | sw $31, PT_R31(sp) | ||
60 | mfc0 k0, CP0_STATUS | ||
61 | sw k0, 0x20(sp) | ||
62 | mfc0 k0, CP0_CONTEXT | ||
63 | sw k0, 0x1c(sp) | ||
64 | mfc0 k0, CP0_PAGEMASK | ||
65 | sw k0, 0x18(sp) | ||
66 | mfc0 k0, CP0_CONFIG | ||
67 | sw k0, 0x14(sp) | ||
68 | |||
69 | /* Now set up the scratch registers so the boot rom will | ||
70 | * return to this point upon wakeup. | ||
71 | */ | ||
72 | la k0, 1f | ||
73 | lui k1, 0xb190 | ||
74 | ori k1, 0x18 | ||
75 | sw sp, 0(k1) | ||
76 | ori k1, 0x1c | ||
77 | sw k0, 0(k1) | ||
78 | |||
79 | /* Put SDRAM into self refresh. Preload instructions into cache, | ||
80 | * issue a precharge, then auto refresh, then sleep commands to it. | ||
81 | */ | ||
82 | la t0, sdsleep | ||
83 | .set mips3 | ||
84 | cache 0x14, 0(t0) | ||
85 | cache 0x14, 32(t0) | ||
86 | cache 0x14, 64(t0) | ||
87 | cache 0x14, 96(t0) | ||
88 | .set mips0 | ||
89 | |||
90 | sdsleep: | ||
91 | lui k0, 0xb400 | ||
92 | sw zero, 0x001c(k0) /* Precharge */ | ||
93 | sw zero, 0x0020(k0) /* Auto refresh */ | ||
94 | sw zero, 0x0030(k0) /* SDRAM sleep */ | ||
95 | sync | ||
96 | |||
97 | lui k1, 0xb190 | ||
98 | sw zero, 0x0078(k1) /* get ready to sleep */ | ||
99 | sync | ||
100 | sw zero, 0x007c(k1) /* Put processor to sleep */ | ||
101 | sync | ||
102 | |||
103 | /* This is where we return upon wakeup. | ||
104 | * Reload all of the registers and return. | ||
105 | */ | ||
106 | 1: nop | ||
107 | lw k0, 0x20(sp) | ||
108 | mtc0 k0, CP0_STATUS | ||
109 | lw k0, 0x1c(sp) | ||
110 | mtc0 k0, CP0_CONTEXT | ||
111 | lw k0, 0x18(sp) | ||
112 | mtc0 k0, CP0_PAGEMASK | ||
113 | lw k0, 0x14(sp) | ||
114 | mtc0 k0, CP0_CONFIG | ||
115 | |||
116 | /* We need to catch the ealry Alchemy SOCs with | ||
117 | * the write-only Config[OD] bit and set it back to one... | ||
118 | */ | ||
119 | jal au1x00_fixup_config_od | ||
120 | lw $1, PT_R1(sp) | ||
121 | lw $2, PT_R2(sp) | ||
122 | lw $3, PT_R3(sp) | ||
123 | lw $4, PT_R4(sp) | ||
124 | lw $5, PT_R5(sp) | ||
125 | lw $6, PT_R6(sp) | ||
126 | lw $7, PT_R7(sp) | ||
127 | lw $8, PT_R8(sp) | ||
128 | lw $9, PT_R9(sp) | ||
129 | lw $10, PT_R10(sp) | ||
130 | lw $11, PT_R11(sp) | ||
131 | lw $12, PT_R12(sp) | ||
132 | lw $13, PT_R13(sp) | ||
133 | lw $14, PT_R14(sp) | ||
134 | lw $15, PT_R15(sp) | ||
135 | lw $16, PT_R16(sp) | ||
136 | lw $17, PT_R17(sp) | ||
137 | lw $18, PT_R18(sp) | ||
138 | lw $19, PT_R19(sp) | ||
139 | lw $20, PT_R20(sp) | ||
140 | lw $21, PT_R21(sp) | ||
141 | lw $22, PT_R22(sp) | ||
142 | lw $23, PT_R23(sp) | ||
143 | lw $24, PT_R24(sp) | ||
144 | lw $25, PT_R25(sp) | ||
145 | lw $26, PT_R26(sp) | ||
146 | lw $27, PT_R27(sp) | ||
147 | lw $28, PT_R28(sp) | ||
148 | lw $29, PT_R29(sp) | ||
149 | lw $30, PT_R30(sp) | ||
150 | lw $31, PT_R31(sp) | ||
151 | addiu sp, PT_SIZE | ||
152 | |||
153 | jr ra | ||
154 | END(save_and_sleep) | ||