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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/arch/arm/mm/proc-sa110.S
3 *
4 * Copyright (C) 1997-2002 Russell King
Hyok S. Choid090ddd2006-06-28 14:10:01 +01005 * hacked for non-paged-MM by Hyok S. Choi, 2003.
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 *
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-110.
15 */
16#include <linux/linkage.h>
17#include <linux/init.h>
18#include <asm/assembler.h>
Sam Ravnborge6ae7442005-09-09 21:08:59 +020019#include <asm/asm-offsets.h>
Russell King5ec94072008-09-07 19:15:31 +010020#include <asm/hwcap.h>
Russell Kinga09e64f2008-08-05 16:14:15 +010021#include <mach/hardware.h>
Russell King74945c82006-03-16 14:44:36 +000022#include <asm/pgtable-hwdef.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <asm/pgtable.h>
24#include <asm/ptrace.h>
25
Thomas Gleixnerbb8d5a52006-07-03 02:21:18 +020026#include "proc-macros.S"
27
Linus Torvalds1da177e2005-04-16 15:20:36 -070028/*
29 * the cache line size of the I and D cache
30 */
31#define DCACHELINESIZE 32
Linus Torvalds1da177e2005-04-16 15:20:36 -070032
Linus Torvalds1da177e2005-04-16 15:20:36 -070033 .text
34
35/*
36 * cpu_sa110_proc_init()
37 */
38ENTRY(cpu_sa110_proc_init)
39 mov r0, #0
40 mcr p15, 0, r0, c15, c1, 2 @ Enable clock switching
41 mov pc, lr
42
43/*
44 * cpu_sa110_proc_fin()
45 */
46ENTRY(cpu_sa110_proc_fin)
47 stmfd sp!, {lr}
48 mov ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
49 msr cpsr_c, ip
50 bl v4wb_flush_kern_cache_all @ clean caches
511: mov r0, #0
52 mcr p15, 0, r0, c15, c2, 2 @ Disable clock switching
53 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
54 bic r0, r0, #0x1000 @ ...i............
55 bic r0, r0, #0x000e @ ............wca.
56 mcr p15, 0, r0, c1, c0, 0 @ disable caches
57 ldmfd sp!, {pc}
58
59/*
60 * cpu_sa110_reset(loc)
61 *
62 * Perform a soft reset of the system. Put the CPU into the
63 * same state as it would be if it had been reset, and branch
64 * to what would be the reset vector.
65 *
66 * loc: location to jump to for soft reset
67 */
68 .align 5
69ENTRY(cpu_sa110_reset)
70 mov ip, #0
71 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
72 mcr p15, 0, ip, c7, c10, 4 @ drain WB
Hyok S. Choid090ddd2006-06-28 14:10:01 +010073#ifdef CONFIG_MMU
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
Hyok S. Choid090ddd2006-06-28 14:10:01 +010075#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
77 bic ip, ip, #0x000f @ ............wcam
78 bic ip, ip, #0x1100 @ ...i...s........
79 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
80 mov pc, r0
81
82/*
83 * cpu_sa110_do_idle(type)
84 *
85 * Cause the processor to idle
86 *
87 * type: call type:
88 * 0 = slow idle
89 * 1 = fast idle
90 * 2 = switch to slow processor clock
91 * 3 = switch to fast processor clock
92 */
93 .align 5
94
95ENTRY(cpu_sa110_do_idle)
96 mcr p15, 0, ip, c15, c2, 2 @ disable clock switching
97 ldr r1, =UNCACHEABLE_ADDR @ load from uncacheable loc
98 ldr r1, [r1, #0] @ force switch to MCLK
99 mov r0, r0 @ safety
100 mov r0, r0 @ safety
101 mov r0, r0 @ safety
102 mcr p15, 0, r0, c15, c8, 2 @ Wait for interrupt, cache aligned
103 mov r0, r0 @ safety
104 mov r0, r0 @ safety
105 mov r0, r0 @ safety
106 mcr p15, 0, r0, c15, c1, 2 @ enable clock switching
107 mov pc, lr
108
109/* ================================= CACHE ================================ */
110
111/*
112 * cpu_sa110_dcache_clean_area(addr,sz)
113 *
114 * Clean the specified entry of any caches such that the MMU
115 * translation fetches will obtain correct data.
116 *
117 * addr: cache-unaligned virtual address
118 */
119 .align 5
120ENTRY(cpu_sa110_dcache_clean_area)
1211: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
122 add r0, r0, #DCACHELINESIZE
123 subs r1, r1, #DCACHELINESIZE
124 bhi 1b
125 mov pc, lr
126
127/* =============================== PageTable ============================== */
128
129/*
130 * cpu_sa110_switch_mm(pgd)
131 *
132 * Set the translation base pointer to be as described by pgd.
133 *
134 * pgd: new page tables
135 */
136 .align 5
137ENTRY(cpu_sa110_switch_mm)
Hyok S. Choid090ddd2006-06-28 14:10:01 +0100138#ifdef CONFIG_MMU
Russell King95f3df62006-04-07 13:17:15 +0100139 str lr, [sp, #-4]!
140 bl v4wb_flush_kern_cache_all @ clears IP
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
Russell King95f3df62006-04-07 13:17:15 +0100142 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
143 ldr pc, [sp], #4
Hyok S. Choid090ddd2006-06-28 14:10:01 +0100144#else
145 mov pc, lr
146#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147
148/*
Russell Kingad1ae2f2006-12-13 14:34:43 +0000149 * cpu_sa110_set_pte_ext(ptep, pte, ext)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 *
151 * Set a PTE and flush it out
152 */
153 .align 5
Russell Kingad1ae2f2006-12-13 14:34:43 +0000154ENTRY(cpu_sa110_set_pte_ext)
Hyok S. Choid090ddd2006-06-28 14:10:01 +0100155#ifdef CONFIG_MMU
Russell Kingda091652008-09-06 17:19:08 +0100156 armv3_set_pte_ext wc_disable=0
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 mov r0, r0
158 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
159 mcr p15, 0, r0, c7, c10, 4 @ drain WB
Hyok S. Choid090ddd2006-06-28 14:10:01 +0100160#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 mov pc, lr
162
163 __INIT
164
165 .type __sa110_setup, #function
166__sa110_setup:
167 mov r10, #0
168 mcr p15, 0, r10, c7, c7 @ invalidate I,D caches on v4
169 mcr p15, 0, r10, c7, c10, 4 @ drain write buffer on v4
Hyok S. Choid090ddd2006-06-28 14:10:01 +0100170#ifdef CONFIG_MMU
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 mcr p15, 0, r10, c8, c7 @ invalidate I,D TLBs on v4
Hyok S. Choid090ddd2006-06-28 14:10:01 +0100172#endif
Russell King22b19082006-06-29 15:09:57 +0100173
174 adr r5, sa110_crval
175 ldmia r5, {r5, r6}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 mrc p15, 0, r0, c1, c0 @ get control register v4
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 bic r0, r0, r5
Russell King22b19082006-06-29 15:09:57 +0100178 orr r0, r0, r6
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 mov pc, lr
180 .size __sa110_setup, . - __sa110_setup
181
182 /*
183 * R
184 * .RVI ZFRS BLDP WCAM
185 * ..01 0001 ..11 1101
186 *
187 */
Russell King22b19082006-06-29 15:09:57 +0100188 .type sa110_crval, #object
189sa110_crval:
190 crval clear=0x00003f3f, mmuset=0x0000113d, ucset=0x00001130
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191
192 __INITDATA
193
194/*
195 * Purpose : Function pointers used to access above functions - all calls
196 * come through these
197 */
198
199 .type sa110_processor_functions, #object
200ENTRY(sa110_processor_functions)
201 .word v4_early_abort
Kirill A. Shutemov4fb28472009-09-25 13:39:47 +0100202 .word legacy_pabort
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 .word cpu_sa110_proc_init
204 .word cpu_sa110_proc_fin
205 .word cpu_sa110_reset
206 .word cpu_sa110_do_idle
207 .word cpu_sa110_dcache_clean_area
208 .word cpu_sa110_switch_mm
Russell Kingad1ae2f2006-12-13 14:34:43 +0000209 .word cpu_sa110_set_pte_ext
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 .size sa110_processor_functions, . - sa110_processor_functions
211
212 .section ".rodata"
213
214 .type cpu_arch_name, #object
215cpu_arch_name:
216 .asciz "armv4"
217 .size cpu_arch_name, . - cpu_arch_name
218
219 .type cpu_elf_name, #object
220cpu_elf_name:
221 .asciz "v4"
222 .size cpu_elf_name, . - cpu_elf_name
223
224 .type cpu_sa110_name, #object
225cpu_sa110_name:
226 .asciz "StrongARM-110"
227 .size cpu_sa110_name, . - cpu_sa110_name
228
229 .align
230
Ben Dooks02b7dd12005-09-20 16:35:03 +0100231 .section ".proc.info.init", #alloc, #execinstr
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232
233 .type __sa110_proc_info,#object
234__sa110_proc_info:
235 .long 0x4401a100
236 .long 0xfffffff0
237 .long PMD_TYPE_SECT | \
238 PMD_SECT_BUFFERABLE | \
239 PMD_SECT_CACHEABLE | \
240 PMD_SECT_AP_WRITE | \
241 PMD_SECT_AP_READ
Russell King8799ee92006-06-29 18:24:21 +0100242 .long PMD_TYPE_SECT | \
243 PMD_SECT_AP_WRITE | \
244 PMD_SECT_AP_READ
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 b __sa110_setup
246 .long cpu_arch_name
247 .long cpu_elf_name
248 .long HWCAP_SWP | HWCAP_HALF | HWCAP_26BIT | HWCAP_FAST_MULT
249 .long cpu_sa110_name
250 .long sa110_processor_functions
251 .long v4wb_tlb_fns
252 .long v4wb_user_fns
253 .long v4wb_cache_fns
254 .size __sa110_proc_info, . - __sa110_proc_info