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1da177e4 LT |
1 | /* |
2 | * This file contains low level CPU setup functions. | |
3 | * Copyright (C) 2003 Benjamin Herrenschmidt (benh@kernel.crashing.org) | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU General Public License | |
7 | * as published by the Free Software Foundation; either version | |
8 | * 2 of the License, or (at your option) any later version. | |
9 | * | |
10 | */ | |
11 | ||
12 | #include <linux/config.h> | |
13 | #include <asm/processor.h> | |
14 | #include <asm/page.h> | |
15 | #include <asm/ppc_asm.h> | |
16 | #include <asm/cputable.h> | |
17 | #include <asm/ppc_asm.h> | |
18 | #include <asm/offsets.h> | |
19 | #include <asm/cache.h> | |
20 | ||
21 | _GLOBAL(__970_cpu_preinit) | |
22 | /* | |
23 | * Do nothing if not running in HV mode | |
24 | */ | |
25 | mfmsr r0 | |
26 | rldicl. r0,r0,4,63 | |
27 | beqlr | |
28 | ||
29 | /* | |
30 | * Deal only with PPC970 and PPC970FX. | |
31 | */ | |
32 | mfspr r0,SPRN_PVR | |
33 | srwi r0,r0,16 | |
34 | cmpwi cr0,r0,0x39 | |
35 | cmpwi cr1,r0,0x3c | |
36 | cror 4*cr0+eq,4*cr0+eq,4*cr1+eq | |
37 | bnelr | |
38 | ||
39 | /* Make sure HID4:rm_ci is off before MMU is turned off, that large | |
40 | * pages are enabled with HID4:61 and clear HID5:DCBZ_size and | |
41 | * HID5:DCBZ32_ill | |
42 | */ | |
43 | li r0,0 | |
44 | mfspr r3,SPRN_HID4 | |
45 | rldimi r3,r0,40,23 /* clear bit 23 (rm_ci) */ | |
46 | rldimi r3,r0,2,61 /* clear bit 61 (lg_pg_en) */ | |
47 | sync | |
48 | mtspr SPRN_HID4,r3 | |
49 | isync | |
50 | sync | |
51 | mfspr r3,SPRN_HID5 | |
52 | rldimi r3,r0,6,56 /* clear bits 56 & 57 (DCBZ*) */ | |
53 | sync | |
54 | mtspr SPRN_HID5,r3 | |
55 | isync | |
56 | sync | |
57 | ||
58 | /* Setup some basic HID1 features */ | |
59 | mfspr r0,SPRN_HID1 | |
60 | li r3,0x1200 /* enable i-fetch cacheability */ | |
61 | sldi r3,r3,44 /* and prefetch */ | |
62 | or r0,r0,r3 | |
63 | mtspr SPRN_HID1,r0 | |
64 | mtspr SPRN_HID1,r0 | |
65 | isync | |
66 | ||
67 | /* Clear HIOR */ | |
68 | li r0,0 | |
69 | sync | |
70 | mtspr SPRN_HIOR,0 /* Clear interrupt prefix */ | |
71 | isync | |
72 | blr | |
73 | ||
74 | _GLOBAL(__setup_cpu_power4) | |
75 | blr | |
fef1c772 AB |
76 | |
77 | _GLOBAL(__setup_cpu_be) | |
78 | /* Set large page sizes LP=0: 16MB, LP=1: 64KB */ | |
79 | addi r3, 0, 0 | |
80 | ori r3, r3, HID6_LB | |
81 | sldi r3, r3, 32 | |
82 | nor r3, r3, r3 | |
83 | mfspr r4, SPRN_HID6 | |
84 | and r4, r4, r3 | |
85 | addi r3, 0, 0x02000 | |
86 | sldi r3, r3, 32 | |
87 | or r4, r4, r3 | |
88 | mtspr SPRN_HID6, r4 | |
89 | blr | |
90 | ||
1da177e4 LT |
91 | _GLOBAL(__setup_cpu_ppc970) |
92 | mfspr r0,SPRN_HID0 | |
93 | li r11,5 /* clear DOZE and SLEEP */ | |
94 | rldimi r0,r11,52,8 /* set NAP and DPM */ | |
95 | mtspr SPRN_HID0,r0 | |
96 | mfspr r0,SPRN_HID0 | |
97 | mfspr r0,SPRN_HID0 | |
98 | mfspr r0,SPRN_HID0 | |
99 | mfspr r0,SPRN_HID0 | |
100 | mfspr r0,SPRN_HID0 | |
101 | mfspr r0,SPRN_HID0 | |
102 | sync | |
103 | isync | |
104 | blr | |
105 | ||
106 | /* Definitions for the table use to save CPU states */ | |
107 | #define CS_HID0 0 | |
108 | #define CS_HID1 8 | |
109 | #define CS_HID4 16 | |
110 | #define CS_HID5 24 | |
111 | #define CS_SIZE 32 | |
112 | ||
113 | .data | |
114 | .balign L1_CACHE_BYTES,0 | |
115 | cpu_state_storage: | |
116 | .space CS_SIZE | |
117 | .balign L1_CACHE_BYTES,0 | |
118 | .text | |
119 | ||
120 | /* Called in normal context to backup CPU 0 state. This | |
121 | * does not include cache settings. This function is also | |
122 | * called for machine sleep. This does not include the MMU | |
123 | * setup, BATs, etc... but rather the "special" registers | |
124 | * like HID0, HID1, HID4, etc... | |
125 | */ | |
126 | _GLOBAL(__save_cpu_setup) | |
127 | /* Some CR fields are volatile, we back it up all */ | |
128 | mfcr r7 | |
129 | ||
130 | /* Get storage ptr */ | |
131 | LOADADDR(r5,cpu_state_storage) | |
132 | ||
133 | /* We only deal with 970 for now */ | |
134 | mfspr r0,SPRN_PVR | |
135 | srwi r0,r0,16 | |
136 | cmpwi cr0,r0,0x39 | |
137 | cmpwi cr1,r0,0x3c | |
138 | cror 4*cr0+eq,4*cr0+eq,4*cr1+eq | |
139 | bne 1f | |
140 | ||
141 | /* Save HID0,1,4 and 5 */ | |
142 | mfspr r3,SPRN_HID0 | |
143 | std r3,CS_HID0(r5) | |
144 | mfspr r3,SPRN_HID1 | |
145 | std r3,CS_HID1(r5) | |
146 | mfspr r3,SPRN_HID4 | |
147 | std r3,CS_HID4(r5) | |
148 | mfspr r3,SPRN_HID5 | |
149 | std r3,CS_HID5(r5) | |
150 | ||
151 | 1: | |
152 | mtcr r7 | |
153 | blr | |
154 | ||
155 | /* Called with no MMU context (typically MSR:IR/DR off) to | |
156 | * restore CPU state as backed up by the previous | |
157 | * function. This does not include cache setting | |
158 | */ | |
159 | _GLOBAL(__restore_cpu_setup) | |
160 | /* Get storage ptr (FIXME when using anton reloc as we | |
161 | * are running with translation disabled here | |
162 | */ | |
163 | LOADADDR(r5,cpu_state_storage) | |
164 | ||
165 | /* We only deal with 970 for now */ | |
166 | mfspr r0,SPRN_PVR | |
167 | srwi r0,r0,16 | |
168 | cmpwi cr0,r0,0x39 | |
169 | cmpwi cr1,r0,0x3c | |
170 | cror 4*cr0+eq,4*cr0+eq,4*cr1+eq | |
171 | bne 1f | |
172 | ||
173 | /* Before accessing memory, we make sure rm_ci is clear */ | |
174 | li r0,0 | |
175 | mfspr r3,SPRN_HID4 | |
176 | rldimi r3,r0,40,23 /* clear bit 23 (rm_ci) */ | |
177 | sync | |
178 | mtspr SPRN_HID4,r3 | |
179 | isync | |
180 | sync | |
181 | ||
182 | /* Clear interrupt prefix */ | |
183 | li r0,0 | |
184 | sync | |
185 | mtspr SPRN_HIOR,0 | |
186 | isync | |
187 | ||
188 | /* Restore HID0 */ | |
189 | ld r3,CS_HID0(r5) | |
190 | sync | |
191 | isync | |
192 | mtspr SPRN_HID0,r3 | |
193 | mfspr r3,SPRN_HID0 | |
194 | mfspr r3,SPRN_HID0 | |
195 | mfspr r3,SPRN_HID0 | |
196 | mfspr r3,SPRN_HID0 | |
197 | mfspr r3,SPRN_HID0 | |
198 | mfspr r3,SPRN_HID0 | |
199 | sync | |
200 | isync | |
201 | ||
202 | /* Restore HID1 */ | |
203 | ld r3,CS_HID1(r5) | |
204 | sync | |
205 | isync | |
206 | mtspr SPRN_HID1,r3 | |
207 | mtspr SPRN_HID1,r3 | |
208 | sync | |
209 | isync | |
210 | ||
211 | /* Restore HID4 */ | |
212 | ld r3,CS_HID4(r5) | |
213 | sync | |
214 | isync | |
215 | mtspr SPRN_HID4,r3 | |
216 | sync | |
217 | isync | |
218 | ||
219 | /* Restore HID5 */ | |
220 | ld r3,CS_HID5(r5) | |
221 | sync | |
222 | isync | |
223 | mtspr SPRN_HID5,r3 | |
224 | sync | |
225 | isync | |
226 | 1: | |
227 | blr | |
228 |