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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/mm/proc-sa110.S | |
3 | * | |
4 | * Copyright (C) 1997-2002 Russell King | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * MMU functions for SA110 | |
11 | * | |
12 | * These are the low level assembler for performing cache and TLB | |
13 | * functions on the StrongARM-110. | |
14 | */ | |
15 | #include <linux/linkage.h> | |
16 | #include <linux/init.h> | |
17 | #include <asm/assembler.h> | |
18 | #include <asm/constants.h> | |
19 | #include <asm/procinfo.h> | |
20 | #include <asm/hardware.h> | |
21 | #include <asm/pgtable.h> | |
22 | #include <asm/ptrace.h> | |
23 | ||
24 | /* | |
25 | * the cache line size of the I and D cache | |
26 | */ | |
27 | #define DCACHELINESIZE 32 | |
28 | #define FLUSH_OFFSET 32768 | |
29 | ||
30 | .macro flush_110_dcache rd, ra, re | |
31 | ldr \rd, =flush_base | |
32 | ldr \ra, [\rd] | |
33 | eor \ra, \ra, #FLUSH_OFFSET | |
34 | str \ra, [\rd] | |
35 | add \re, \ra, #16384 @ only necessary for 16k | |
36 | 1001: ldr \rd, [\ra], #DCACHELINESIZE | |
37 | teq \re, \ra | |
38 | bne 1001b | |
39 | .endm | |
40 | ||
41 | .data | |
42 | flush_base: | |
43 | .long FLUSH_BASE | |
44 | .text | |
45 | ||
46 | /* | |
47 | * cpu_sa110_proc_init() | |
48 | */ | |
49 | ENTRY(cpu_sa110_proc_init) | |
50 | mov r0, #0 | |
51 | mcr p15, 0, r0, c15, c1, 2 @ Enable clock switching | |
52 | mov pc, lr | |
53 | ||
54 | /* | |
55 | * cpu_sa110_proc_fin() | |
56 | */ | |
57 | ENTRY(cpu_sa110_proc_fin) | |
58 | stmfd sp!, {lr} | |
59 | mov ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE | |
60 | msr cpsr_c, ip | |
61 | bl v4wb_flush_kern_cache_all @ clean caches | |
62 | 1: mov r0, #0 | |
63 | mcr p15, 0, r0, c15, c2, 2 @ Disable clock switching | |
64 | mrc p15, 0, r0, c1, c0, 0 @ ctrl register | |
65 | bic r0, r0, #0x1000 @ ...i............ | |
66 | bic r0, r0, #0x000e @ ............wca. | |
67 | mcr p15, 0, r0, c1, c0, 0 @ disable caches | |
68 | ldmfd sp!, {pc} | |
69 | ||
70 | /* | |
71 | * cpu_sa110_reset(loc) | |
72 | * | |
73 | * Perform a soft reset of the system. Put the CPU into the | |
74 | * same state as it would be if it had been reset, and branch | |
75 | * to what would be the reset vector. | |
76 | * | |
77 | * loc: location to jump to for soft reset | |
78 | */ | |
79 | .align 5 | |
80 | ENTRY(cpu_sa110_reset) | |
81 | mov ip, #0 | |
82 | mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches | |
83 | mcr p15, 0, ip, c7, c10, 4 @ drain WB | |
84 | mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs | |
85 | mrc p15, 0, ip, c1, c0, 0 @ ctrl register | |
86 | bic ip, ip, #0x000f @ ............wcam | |
87 | bic ip, ip, #0x1100 @ ...i...s........ | |
88 | mcr p15, 0, ip, c1, c0, 0 @ ctrl register | |
89 | mov pc, r0 | |
90 | ||
91 | /* | |
92 | * cpu_sa110_do_idle(type) | |
93 | * | |
94 | * Cause the processor to idle | |
95 | * | |
96 | * type: call type: | |
97 | * 0 = slow idle | |
98 | * 1 = fast idle | |
99 | * 2 = switch to slow processor clock | |
100 | * 3 = switch to fast processor clock | |
101 | */ | |
102 | .align 5 | |
103 | ||
104 | ENTRY(cpu_sa110_do_idle) | |
105 | mcr p15, 0, ip, c15, c2, 2 @ disable clock switching | |
106 | ldr r1, =UNCACHEABLE_ADDR @ load from uncacheable loc | |
107 | ldr r1, [r1, #0] @ force switch to MCLK | |
108 | mov r0, r0 @ safety | |
109 | mov r0, r0 @ safety | |
110 | mov r0, r0 @ safety | |
111 | mcr p15, 0, r0, c15, c8, 2 @ Wait for interrupt, cache aligned | |
112 | mov r0, r0 @ safety | |
113 | mov r0, r0 @ safety | |
114 | mov r0, r0 @ safety | |
115 | mcr p15, 0, r0, c15, c1, 2 @ enable clock switching | |
116 | mov pc, lr | |
117 | ||
118 | /* ================================= CACHE ================================ */ | |
119 | ||
120 | /* | |
121 | * cpu_sa110_dcache_clean_area(addr,sz) | |
122 | * | |
123 | * Clean the specified entry of any caches such that the MMU | |
124 | * translation fetches will obtain correct data. | |
125 | * | |
126 | * addr: cache-unaligned virtual address | |
127 | */ | |
128 | .align 5 | |
129 | ENTRY(cpu_sa110_dcache_clean_area) | |
130 | 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry | |
131 | add r0, r0, #DCACHELINESIZE | |
132 | subs r1, r1, #DCACHELINESIZE | |
133 | bhi 1b | |
134 | mov pc, lr | |
135 | ||
136 | /* =============================== PageTable ============================== */ | |
137 | ||
138 | /* | |
139 | * cpu_sa110_switch_mm(pgd) | |
140 | * | |
141 | * Set the translation base pointer to be as described by pgd. | |
142 | * | |
143 | * pgd: new page tables | |
144 | */ | |
145 | .align 5 | |
146 | ENTRY(cpu_sa110_switch_mm) | |
147 | flush_110_dcache r3, ip, r1 | |
148 | mov r1, #0 | |
149 | mcr p15, 0, r1, c7, c5, 0 @ invalidate I cache | |
150 | mcr p15, 0, r1, c7, c10, 4 @ drain WB | |
151 | mcr p15, 0, r0, c2, c0, 0 @ load page table pointer | |
152 | mcr p15, 0, r1, c8, c7, 0 @ invalidate I & D TLBs | |
153 | mov pc, lr | |
154 | ||
155 | /* | |
156 | * cpu_sa110_set_pte(ptep, pte) | |
157 | * | |
158 | * Set a PTE and flush it out | |
159 | */ | |
160 | .align 5 | |
161 | ENTRY(cpu_sa110_set_pte) | |
162 | str r1, [r0], #-2048 @ linux version | |
163 | ||
164 | eor r1, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY | |
165 | ||
166 | bic r2, r1, #PTE_SMALL_AP_MASK | |
167 | bic r2, r2, #PTE_TYPE_MASK | |
168 | orr r2, r2, #PTE_TYPE_SMALL | |
169 | ||
170 | tst r1, #L_PTE_USER @ User? | |
171 | orrne r2, r2, #PTE_SMALL_AP_URO_SRW | |
172 | ||
173 | tst r1, #L_PTE_WRITE | L_PTE_DIRTY @ Write and Dirty? | |
174 | orreq r2, r2, #PTE_SMALL_AP_UNO_SRW | |
175 | ||
176 | tst r1, #L_PTE_PRESENT | L_PTE_YOUNG @ Present and Young? | |
177 | movne r2, #0 | |
178 | ||
179 | str r2, [r0] @ hardware version | |
180 | mov r0, r0 | |
181 | mcr p15, 0, r0, c7, c10, 1 @ clean D entry | |
182 | mcr p15, 0, r0, c7, c10, 4 @ drain WB | |
183 | mov pc, lr | |
184 | ||
185 | __INIT | |
186 | ||
187 | .type __sa110_setup, #function | |
188 | __sa110_setup: | |
189 | mov r10, #0 | |
190 | mcr p15, 0, r10, c7, c7 @ invalidate I,D caches on v4 | |
191 | mcr p15, 0, r10, c7, c10, 4 @ drain write buffer on v4 | |
192 | mcr p15, 0, r10, c8, c7 @ invalidate I,D TLBs on v4 | |
193 | mrc p15, 0, r0, c1, c0 @ get control register v4 | |
194 | ldr r5, sa110_cr1_clear | |
195 | bic r0, r0, r5 | |
196 | ldr r5, sa110_cr1_set | |
197 | orr r0, r0, r5 | |
198 | mov pc, lr | |
199 | .size __sa110_setup, . - __sa110_setup | |
200 | ||
201 | /* | |
202 | * R | |
203 | * .RVI ZFRS BLDP WCAM | |
204 | * ..01 0001 ..11 1101 | |
205 | * | |
206 | */ | |
207 | .type sa110_cr1_clear, #object | |
208 | .type sa110_cr1_set, #object | |
209 | sa110_cr1_clear: | |
210 | .word 0x3f3f | |
211 | sa110_cr1_set: | |
212 | .word 0x113d | |
213 | ||
214 | __INITDATA | |
215 | ||
216 | /* | |
217 | * Purpose : Function pointers used to access above functions - all calls | |
218 | * come through these | |
219 | */ | |
220 | ||
221 | .type sa110_processor_functions, #object | |
222 | ENTRY(sa110_processor_functions) | |
223 | .word v4_early_abort | |
224 | .word cpu_sa110_proc_init | |
225 | .word cpu_sa110_proc_fin | |
226 | .word cpu_sa110_reset | |
227 | .word cpu_sa110_do_idle | |
228 | .word cpu_sa110_dcache_clean_area | |
229 | .word cpu_sa110_switch_mm | |
230 | .word cpu_sa110_set_pte | |
231 | .size sa110_processor_functions, . - sa110_processor_functions | |
232 | ||
233 | .section ".rodata" | |
234 | ||
235 | .type cpu_arch_name, #object | |
236 | cpu_arch_name: | |
237 | .asciz "armv4" | |
238 | .size cpu_arch_name, . - cpu_arch_name | |
239 | ||
240 | .type cpu_elf_name, #object | |
241 | cpu_elf_name: | |
242 | .asciz "v4" | |
243 | .size cpu_elf_name, . - cpu_elf_name | |
244 | ||
245 | .type cpu_sa110_name, #object | |
246 | cpu_sa110_name: | |
247 | .asciz "StrongARM-110" | |
248 | .size cpu_sa110_name, . - cpu_sa110_name | |
249 | ||
250 | .align | |
251 | ||
252 | .section ".proc.info", #alloc, #execinstr | |
253 | ||
254 | .type __sa110_proc_info,#object | |
255 | __sa110_proc_info: | |
256 | .long 0x4401a100 | |
257 | .long 0xfffffff0 | |
258 | .long PMD_TYPE_SECT | \ | |
259 | PMD_SECT_BUFFERABLE | \ | |
260 | PMD_SECT_CACHEABLE | \ | |
261 | PMD_SECT_AP_WRITE | \ | |
262 | PMD_SECT_AP_READ | |
263 | b __sa110_setup | |
264 | .long cpu_arch_name | |
265 | .long cpu_elf_name | |
266 | .long HWCAP_SWP | HWCAP_HALF | HWCAP_26BIT | HWCAP_FAST_MULT | |
267 | .long cpu_sa110_name | |
268 | .long sa110_processor_functions | |
269 | .long v4wb_tlb_fns | |
270 | .long v4wb_user_fns | |
271 | .long v4wb_cache_fns | |
272 | .size __sa110_proc_info, . - __sa110_proc_info |