ARM: pm: ensure ARMv7 CPUs save and restore the TLS register
[deliverable/linux.git] / arch / arm / mm / proc-sa1100.S
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1/*
2 * linux/arch/arm/mm/proc-sa1100.S
3 *
4 * Copyright (C) 1997-2002 Russell King
d090ddda 5 * hacked for non-paged-MM by Hyok S. Choi, 2003.
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6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * MMU functions for SA110
12 *
13 * These are the low level assembler for performing cache and TLB
14 * functions on the StrongARM-1100 and StrongARM-1110.
15 *
16 * Note that SA1100 and SA1110 share everything but their name and CPU ID.
17 *
18 * 12-jun-2000, Erik Mouw (J.A.K.Mouw@its.tudelft.nl):
19 * Flush the read buffer at context switches
20 */
21#include <linux/linkage.h>
22#include <linux/init.h>
23#include <asm/assembler.h>
e6ae744d 24#include <asm/asm-offsets.h>
5ec9407d 25#include <asm/hwcap.h>
a09e64fb 26#include <mach/hardware.h>
74945c86 27#include <asm/pgtable-hwdef.h>
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28#include <asm/pgtable.h>
29
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30#include "proc-macros.S"
31
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32/*
33 * the cache line size of the I and D cache
34 */
35#define DCACHELINESIZE 32
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36
37 __INIT
38
39/*
40 * cpu_sa1100_proc_init()
41 */
42ENTRY(cpu_sa1100_proc_init)
43 mov r0, #0
44 mcr p15, 0, r0, c15, c1, 2 @ Enable clock switching
45 mcr p15, 0, r0, c9, c0, 5 @ Allow read-buffer operations from userland
46 mov pc, lr
47
4260415f 48 .section .text
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49
50/*
51 * cpu_sa1100_proc_fin()
52 *
53 * Prepare the CPU for reset:
54 * - Disable interrupts
55 * - Clean and turn off caches.
56 */
57ENTRY(cpu_sa1100_proc_fin)
95f3df6b 58 mcr p15, 0, ip, c15, c2, 2 @ Disable clock switching
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59 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
60 bic r0, r0, #0x1000 @ ...i............
61 bic r0, r0, #0x000e @ ............wca.
62 mcr p15, 0, r0, c1, c0, 0 @ disable caches
9ca03a21 63 mov pc, lr
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64
65/*
66 * cpu_sa1100_reset(loc)
67 *
68 * Perform a soft reset of the system. Put the CPU into the
69 * same state as it would be if it had been reset, and branch
70 * to what would be the reset vector.
71 *
72 * loc: location to jump to for soft reset
73 */
74 .align 5
75ENTRY(cpu_sa1100_reset)
76 mov ip, #0
77 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
78 mcr p15, 0, ip, c7, c10, 4 @ drain WB
d090ddda 79#ifdef CONFIG_MMU
1da177e4 80 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
d090ddda 81#endif
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82 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
83 bic ip, ip, #0x000f @ ............wcam
84 bic ip, ip, #0x1100 @ ...i...s........
85 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
86 mov pc, r0
87
88/*
89 * cpu_sa1100_do_idle(type)
90 *
91 * Cause the processor to idle
92 *
93 * type: call type:
94 * 0 = slow idle
95 * 1 = fast idle
96 * 2 = switch to slow processor clock
97 * 3 = switch to fast processor clock
98 */
99 .align 5
100ENTRY(cpu_sa1100_do_idle)
101 mov r0, r0 @ 4 nop padding
102 mov r0, r0
103 mov r0, r0
104 mov r0, r0 @ 4 nop padding
105 mov r0, r0
106 mov r0, r0
107 mov r0, #0
108 ldr r1, =UNCACHEABLE_ADDR @ ptr to uncacheable address
109 @ --- aligned to a cache line
110 mcr p15, 0, r0, c15, c2, 2 @ disable clock switching
111 ldr r1, [r1, #0] @ force switch to MCLK
112 mcr p15, 0, r0, c15, c8, 2 @ wait for interrupt
113 mov r0, r0 @ safety
114 mcr p15, 0, r0, c15, c1, 2 @ enable clock switching
115 mov pc, lr
116
117/* ================================= CACHE ================================ */
118
119/*
120 * cpu_sa1100_dcache_clean_area(addr,sz)
121 *
122 * Clean the specified entry of any caches such that the MMU
123 * translation fetches will obtain correct data.
124 *
125 * addr: cache-unaligned virtual address
126 */
127 .align 5
128ENTRY(cpu_sa1100_dcache_clean_area)
1291: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
130 add r0, r0, #DCACHELINESIZE
131 subs r1, r1, #DCACHELINESIZE
132 bhi 1b
133 mov pc, lr
134
135/* =============================== PageTable ============================== */
136
137/*
138 * cpu_sa1100_switch_mm(pgd)
139 *
140 * Set the translation base pointer to be as described by pgd.
141 *
142 * pgd: new page tables
143 */
144 .align 5
145ENTRY(cpu_sa1100_switch_mm)
d090ddda 146#ifdef CONFIG_MMU
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147 str lr, [sp, #-4]!
148 bl v4wb_flush_kern_cache_all @ clears IP
1da177e4 149 mcr p15, 0, ip, c9, c0, 0 @ invalidate RB
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150 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
151 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
95f3df6b 152 ldr pc, [sp], #4
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153#else
154 mov pc, lr
155#endif
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156
157/*
ad1ae2fe 158 * cpu_sa1100_set_pte_ext(ptep, pte, ext)
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159 *
160 * Set a PTE and flush it out
161 */
162 .align 5
ad1ae2fe 163ENTRY(cpu_sa1100_set_pte_ext)
d090ddda 164#ifdef CONFIG_MMU
da091653 165 armv3_set_pte_ext wc_disable=0
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166 mov r0, r0
167 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
168 mcr p15, 0, r0, c7, c10, 4 @ drain WB
d090ddda 169#endif
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170 mov pc, lr
171
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172.globl cpu_sa1100_suspend_size
173.equ cpu_sa1100_suspend_size, 4*4
29ea23ff 174#ifdef CONFIG_PM_SLEEP
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175ENTRY(cpu_sa1100_do_suspend)
176 stmfd sp!, {r4 - r7, lr}
177 mrc p15, 0, r4, c3, c0, 0 @ domain ID
178 mrc p15, 0, r5, c2, c0, 0 @ translation table base addr
179 mrc p15, 0, r6, c13, c0, 0 @ PID
180 mrc p15, 0, r7, c1, c0, 0 @ control reg
181 stmia r0, {r4 - r7} @ store cp regs
182 ldmfd sp!, {r4 - r7, pc}
183ENDPROC(cpu_sa1100_do_suspend)
184
185ENTRY(cpu_sa1100_do_resume)
186 ldmia r0, {r4 - r7} @ load cp regs
187 mov r1, #0
188 mcr p15, 0, r1, c8, c7, 0 @ flush I+D TLBs
189 mcr p15, 0, r1, c7, c7, 0 @ flush I&D cache
190 mcr p15, 0, r1, c9, c0, 0 @ invalidate RB
191 mcr p15, 0, r1, c9, c0, 5 @ allow user space to use RB
192
193 mcr p15, 0, r4, c3, c0, 0 @ domain ID
194 mcr p15, 0, r5, c2, c0, 0 @ translation table base addr
195 mcr p15, 0, r6, c13, c0, 0 @ PID
196 mov r0, r7 @ control register
197 mov r2, r5, lsr #14 @ get TTB0 base
198 mov r2, r2, lsl #14
199 ldr r3, =PMD_TYPE_SECT | PMD_SECT_BUFFERABLE | \
200 PMD_SECT_CACHEABLE | PMD_SECT_AP_WRITE
201 b cpu_resume_mmu
202ENDPROC(cpu_sa1100_do_resume)
203#else
204#define cpu_sa1100_do_suspend 0
205#define cpu_sa1100_do_resume 0
206#endif
207
5085f3ff 208 __CPUINIT
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209
210 .type __sa1100_setup, #function
211__sa1100_setup:
212 mov r0, #0
213 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
214 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
d090ddda 215#ifdef CONFIG_MMU
1da177e4 216 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
d090ddda 217#endif
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218 adr r5, sa1100_crval
219 ldmia r5, {r5, r6}
1da177e4 220 mrc p15, 0, r0, c1, c0 @ get control register v4
1da177e4 221 bic r0, r0, r5
22b19086 222 orr r0, r0, r6
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223 mov pc, lr
224 .size __sa1100_setup, . - __sa1100_setup
225
226 /*
227 * R
228 * .RVI ZFRS BLDP WCAM
229 * ..11 0001 ..11 1101
230 *
231 */
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232 .type sa1100_crval, #object
233sa1100_crval:
234 crval clear=0x00003f3f, mmuset=0x0000313d, ucset=0x00001130
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235
236 __INITDATA
237
238/*
239 * Purpose : Function pointers used to access above functions - all calls
240 * come through these
241 */
242
243/*
244 * SA1100 and SA1110 share the same function calls
245 */
246 .type sa1100_processor_functions, #object
247ENTRY(sa1100_processor_functions)
248 .word v4_early_abort
4fb28474 249 .word legacy_pabort
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250 .word cpu_sa1100_proc_init
251 .word cpu_sa1100_proc_fin
252 .word cpu_sa1100_reset
253 .word cpu_sa1100_do_idle
254 .word cpu_sa1100_dcache_clean_area
255 .word cpu_sa1100_switch_mm
ad1ae2fe 256 .word cpu_sa1100_set_pte_ext
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257 .word cpu_sa1100_suspend_size
258 .word cpu_sa1100_do_suspend
259 .word cpu_sa1100_do_resume
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260 .size sa1100_processor_functions, . - sa1100_processor_functions
261
262 .section ".rodata"
263
264 .type cpu_arch_name, #object
265cpu_arch_name:
266 .asciz "armv4"
267 .size cpu_arch_name, . - cpu_arch_name
268
269 .type cpu_elf_name, #object
270cpu_elf_name:
271 .asciz "v4"
272 .size cpu_elf_name, . - cpu_elf_name
273
274 .type cpu_sa1100_name, #object
275cpu_sa1100_name:
276 .asciz "StrongARM-1100"
277 .size cpu_sa1100_name, . - cpu_sa1100_name
278
279 .type cpu_sa1110_name, #object
280cpu_sa1110_name:
281 .asciz "StrongARM-1110"
282 .size cpu_sa1110_name, . - cpu_sa1110_name
283
284 .align
285
02b7dd12 286 .section ".proc.info.init", #alloc, #execinstr
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287
288 .type __sa1100_proc_info,#object
289__sa1100_proc_info:
290 .long 0x4401a110
291 .long 0xfffffff0
292 .long PMD_TYPE_SECT | \
293 PMD_SECT_BUFFERABLE | \
294 PMD_SECT_CACHEABLE | \
295 PMD_SECT_AP_WRITE | \
296 PMD_SECT_AP_READ
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297 .long PMD_TYPE_SECT | \
298 PMD_SECT_AP_WRITE | \
299 PMD_SECT_AP_READ
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300 b __sa1100_setup
301 .long cpu_arch_name
302 .long cpu_elf_name
303 .long HWCAP_SWP | HWCAP_HALF | HWCAP_26BIT | HWCAP_FAST_MULT
304 .long cpu_sa1100_name
305 .long sa1100_processor_functions
306 .long v4wb_tlb_fns
307 .long v4_mc_user_fns
308 .long v4wb_cache_fns
309 .size __sa1100_proc_info, . - __sa1100_proc_info
310
311 .type __sa1110_proc_info,#object
312__sa1110_proc_info:
313 .long 0x6901b110
314 .long 0xfffffff0
315 .long PMD_TYPE_SECT | \
316 PMD_SECT_BUFFERABLE | \
317 PMD_SECT_CACHEABLE | \
318 PMD_SECT_AP_WRITE | \
319 PMD_SECT_AP_READ
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320 .long PMD_TYPE_SECT | \
321 PMD_SECT_AP_WRITE | \
322 PMD_SECT_AP_READ
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323 b __sa1100_setup
324 .long cpu_arch_name
325 .long cpu_elf_name
326 .long HWCAP_SWP | HWCAP_HALF | HWCAP_26BIT | HWCAP_FAST_MULT
327 .long cpu_sa1110_name
328 .long sa1100_processor_functions
329 .long v4wb_tlb_fns
330 .long v4_mc_user_fns
331 .long v4wb_cache_fns
332 .size __sa1110_proc_info, . - __sa1110_proc_info
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