Commit | Line | Data |
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90103f93 AV |
1 | /* |
2 | * Based on swsusp_32.S, modified for FSL BookE by | |
3 | * Anton Vorontsov <avorontsov@ru.mvista.com> | |
4 | * Copyright (c) 2009-2010 MontaVista Software, LLC. | |
5 | */ | |
6 | ||
7 | #include <linux/threads.h> | |
8 | #include <asm/processor.h> | |
9 | #include <asm/page.h> | |
10 | #include <asm/cputable.h> | |
11 | #include <asm/thread_info.h> | |
12 | #include <asm/ppc_asm.h> | |
13 | #include <asm/asm-offsets.h> | |
14 | #include <asm/mmu.h> | |
15 | ||
16 | /* | |
17 | * Structure for storing CPU registers on the save area. | |
18 | */ | |
19 | #define SL_SP 0 | |
20 | #define SL_PC 4 | |
21 | #define SL_MSR 8 | |
22 | #define SL_TCR 0xc | |
23 | #define SL_SPRG0 0x10 | |
24 | #define SL_SPRG1 0x14 | |
25 | #define SL_SPRG2 0x18 | |
26 | #define SL_SPRG3 0x1c | |
27 | #define SL_SPRG4 0x20 | |
28 | #define SL_SPRG5 0x24 | |
29 | #define SL_SPRG6 0x28 | |
30 | #define SL_SPRG7 0x2c | |
31 | #define SL_TBU 0x30 | |
32 | #define SL_TBL 0x34 | |
33 | #define SL_R2 0x38 | |
34 | #define SL_CR 0x3c | |
35 | #define SL_LR 0x40 | |
36 | #define SL_R12 0x44 /* r12 to r31 */ | |
37 | #define SL_SIZE (SL_R12 + 80) | |
38 | ||
39 | .section .data | |
40 | .align 5 | |
41 | ||
42 | _GLOBAL(swsusp_save_area) | |
43 | .space SL_SIZE | |
44 | ||
45 | ||
46 | .section .text | |
47 | .align 5 | |
48 | ||
49 | _GLOBAL(swsusp_arch_suspend) | |
50 | lis r11,swsusp_save_area@h | |
51 | ori r11,r11,swsusp_save_area@l | |
52 | ||
53 | mflr r0 | |
54 | stw r0,SL_LR(r11) | |
55 | mfcr r0 | |
56 | stw r0,SL_CR(r11) | |
57 | stw r1,SL_SP(r11) | |
58 | stw r2,SL_R2(r11) | |
59 | stmw r12,SL_R12(r11) | |
60 | ||
61 | /* Save MSR & TCR */ | |
62 | mfmsr r4 | |
63 | stw r4,SL_MSR(r11) | |
64 | mfspr r4,SPRN_TCR | |
65 | stw r4,SL_TCR(r11) | |
66 | ||
67 | /* Get a stable timebase and save it */ | |
68 | 1: mfspr r4,SPRN_TBRU | |
69 | stw r4,SL_TBU(r11) | |
70 | mfspr r5,SPRN_TBRL | |
71 | stw r5,SL_TBL(r11) | |
72 | mfspr r3,SPRN_TBRU | |
73 | cmpw r3,r4 | |
74 | bne 1b | |
75 | ||
76 | /* Save SPRGs */ | |
77 | mfsprg r4,0 | |
78 | stw r4,SL_SPRG0(r11) | |
79 | mfsprg r4,1 | |
80 | stw r4,SL_SPRG1(r11) | |
81 | mfsprg r4,2 | |
82 | stw r4,SL_SPRG2(r11) | |
83 | mfsprg r4,3 | |
84 | stw r4,SL_SPRG3(r11) | |
85 | mfsprg r4,4 | |
86 | stw r4,SL_SPRG4(r11) | |
87 | mfsprg r4,5 | |
88 | stw r4,SL_SPRG5(r11) | |
89 | mfsprg r4,6 | |
90 | stw r4,SL_SPRG6(r11) | |
91 | mfsprg r4,7 | |
92 | stw r4,SL_SPRG7(r11) | |
93 | ||
94 | /* Call the low level suspend stuff (we should probably have made | |
95 | * a stackframe... | |
96 | */ | |
97 | bl swsusp_save | |
98 | ||
99 | /* Restore LR from the save area */ | |
100 | lis r11,swsusp_save_area@h | |
101 | ori r11,r11,swsusp_save_area@l | |
102 | lwz r0,SL_LR(r11) | |
103 | mtlr r0 | |
104 | ||
105 | blr | |
106 | ||
107 | _GLOBAL(swsusp_arch_resume) | |
108 | sync | |
109 | ||
110 | /* Load ptr the list of pages to copy in r3 */ | |
111 | lis r11,(restore_pblist)@h | |
112 | ori r11,r11,restore_pblist@l | |
113 | lwz r3,0(r11) | |
114 | ||
115 | /* Copy the pages. This is a very basic implementation, to | |
116 | * be replaced by something more cache efficient */ | |
117 | 1: | |
118 | li r0,256 | |
119 | mtctr r0 | |
120 | lwz r5,pbe_address(r3) /* source */ | |
121 | lwz r6,pbe_orig_address(r3) /* destination */ | |
122 | 2: | |
123 | lwz r8,0(r5) | |
124 | lwz r9,4(r5) | |
125 | lwz r10,8(r5) | |
126 | lwz r11,12(r5) | |
127 | addi r5,r5,16 | |
128 | stw r8,0(r6) | |
129 | stw r9,4(r6) | |
130 | stw r10,8(r6) | |
131 | stw r11,12(r6) | |
132 | addi r6,r6,16 | |
133 | bdnz 2b | |
134 | lwz r3,pbe_next(r3) | |
135 | cmpwi 0,r3,0 | |
136 | bne 1b | |
137 | ||
138 | bl flush_dcache_L1 | |
139 | bl flush_instruction_cache | |
140 | ||
141 | lis r11,swsusp_save_area@h | |
142 | ori r11,r11,swsusp_save_area@l | |
143 | ||
144 | lwz r4,SL_SPRG0(r11) | |
145 | mtsprg 0,r4 | |
146 | lwz r4,SL_SPRG1(r11) | |
147 | mtsprg 1,r4 | |
148 | lwz r4,SL_SPRG2(r11) | |
149 | mtsprg 2,r4 | |
150 | lwz r4,SL_SPRG3(r11) | |
151 | mtsprg 3,r4 | |
152 | lwz r4,SL_SPRG4(r11) | |
153 | mtsprg 4,r4 | |
154 | lwz r4,SL_SPRG5(r11) | |
155 | mtsprg 5,r4 | |
156 | lwz r4,SL_SPRG6(r11) | |
157 | mtsprg 6,r4 | |
158 | lwz r4,SL_SPRG7(r11) | |
159 | mtsprg 7,r4 | |
160 | ||
161 | /* restore the MSR */ | |
162 | lwz r3,SL_MSR(r11) | |
163 | mtmsr r3 | |
164 | ||
165 | /* Restore TB */ | |
166 | li r3,0 | |
167 | mtspr SPRN_TBWL,r3 | |
168 | lwz r3,SL_TBU(r11) | |
169 | lwz r4,SL_TBL(r11) | |
170 | mtspr SPRN_TBWU,r3 | |
171 | mtspr SPRN_TBWL,r4 | |
172 | ||
173 | /* Restore TCR and clear any pending bits in TSR. */ | |
174 | lwz r4,SL_TCR(r11) | |
175 | mtspr SPRN_TCR,r4 | |
176 | lis r4, (TSR_ENW | TSR_WIS | TSR_DIS | TSR_FIS)@h | |
177 | mtspr SPRN_TSR,r4 | |
178 | ||
179 | /* Kick decrementer */ | |
180 | li r0,1 | |
181 | mtdec r0 | |
182 | ||
183 | /* Restore the callee-saved registers and return */ | |
184 | lwz r0,SL_CR(r11) | |
185 | mtcr r0 | |
186 | lwz r2,SL_R2(r11) | |
187 | lmw r12,SL_R12(r11) | |
188 | lwz r1,SL_SP(r11) | |
189 | lwz r0,SL_LR(r11) | |
190 | mtlr r0 | |
191 | ||
192 | li r3,0 | |
193 | blr |