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Paulius Zaleckas28853ac2009-03-25 13:10:01 +02001/*
2 * linux/arch/arm/mm/proc-fa526.S: MMU functions for FA526
3 *
4 * Written by : Luke Lee
5 * Copyright (C) 2005 Faraday Corp.
6 * Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 *
14 * These are the low level assembler for performing cache and TLB
15 * functions on the fa526.
16 */
17#include <linux/linkage.h>
18#include <linux/init.h>
19#include <asm/assembler.h>
20#include <asm/hwcap.h>
21#include <asm/pgtable-hwdef.h>
22#include <asm/pgtable.h>
23#include <asm/page.h>
24#include <asm/ptrace.h>
25#include <asm/system.h>
26
27#include "proc-macros.S"
28
29#define CACHE_DLINESIZE 16
30
31 .text
32/*
33 * cpu_fa526_proc_init()
34 */
35ENTRY(cpu_fa526_proc_init)
36 mov pc, lr
37
38/*
39 * cpu_fa526_proc_fin()
40 */
41ENTRY(cpu_fa526_proc_fin)
42 stmfd sp!, {lr}
43 mov ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
44 msr cpsr_c, ip
45 bl fa_flush_kern_cache_all
46 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
47 bic r0, r0, #0x1000 @ ...i............
48 bic r0, r0, #0x000e @ ............wca.
49 mcr p15, 0, r0, c1, c0, 0 @ disable caches
50 nop
51 nop
52 ldmfd sp!, {pc}
53
54/*
55 * cpu_fa526_reset(loc)
56 *
57 * Perform a soft reset of the system. Put the CPU into the
58 * same state as it would be if it had been reset, and branch
59 * to what would be the reset vector.
60 *
61 * loc: location to jump to for soft reset
62 */
63 .align 4
64ENTRY(cpu_fa526_reset)
65/* TODO: Use CP8 if possible... */
66 mov ip, #0
67 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
68 mcr p15, 0, ip, c7, c10, 4 @ drain WB
69#ifdef CONFIG_MMU
70 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
71#endif
72 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
73 bic ip, ip, #0x000f @ ............wcam
74 bic ip, ip, #0x1100 @ ...i...s........
75 bic ip, ip, #0x0800 @ BTB off
76 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
77 nop
78 nop
79 mov pc, r0
80
81/*
82 * cpu_fa526_do_idle()
83 */
84 .align 4
85ENTRY(cpu_fa526_do_idle)
86 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
87 mov pc, lr
88
89
90ENTRY(cpu_fa526_dcache_clean_area)
911: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
92 add r0, r0, #CACHE_DLINESIZE
93 subs r1, r1, #CACHE_DLINESIZE
94 bhi 1b
95 mcr p15, 0, r0, c7, c10, 4 @ drain WB
96 mov pc, lr
97
98/* =============================== PageTable ============================== */
99
100/*
101 * cpu_fa526_switch_mm(pgd)
102 *
103 * Set the translation base pointer to be as described by pgd.
104 *
105 * pgd: new page tables
106 */
107 .align 4
108ENTRY(cpu_fa526_switch_mm)
109#ifdef CONFIG_MMU
110 mov ip, #0
111#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
112 mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache
113#else
114 mcr p15, 0, ip, c7, c14, 0 @ clean and invalidate whole D cache
115#endif
116 mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
117 mcr p15, 0, ip, c7, c5, 6 @ invalidate BTB since mm changed
118 mcr p15, 0, ip, c7, c10, 4 @ data write barrier
119 mcr p15, 0, ip, c7, c5, 4 @ prefetch flush
120 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
121 mcr p15, 0, ip, c8, c7, 0 @ invalidate UTLB
122#endif
123 mov pc, lr
124
125/*
126 * cpu_fa526_set_pte_ext(ptep, pte, ext)
127 *
128 * Set a PTE and flush it out
129 */
130 .align 4
131ENTRY(cpu_fa526_set_pte_ext)
132#ifdef CONFIG_MMU
133 armv3_set_pte_ext
134 mov r0, r0
135 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
136 mov r0, #0
137 mcr p15, 0, r0, c7, c10, 4 @ drain WB
138#endif
139 mov pc, lr
140
141 __INIT
142
143 .type __fa526_setup, #function
144__fa526_setup:
145 /* On return of this routine, r0 must carry correct flags for CFG register */
146 mov r0, #0
147 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
148 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
149#ifdef CONFIG_MMU
150 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
151#endif
152 mcr p15, 0, r0, c7, c5, 5 @ invalidate IScratchpad RAM
153
154 mov r0, #1
155 mcr p15, 0, r0, c1, c1, 0 @ turn-on ECR
156
157 mov r0, #0
158 mcr p15, 0, r0, c7, c5, 6 @ invalidate BTB All
159 mcr p15, 0, r0, c7, c10, 4 @ data write barrier
160 mcr p15, 0, r0, c7, c5, 4 @ prefetch flush
161
162 mov r0, #0x1f @ Domains 0, 1 = manager, 2 = client
163 mcr p15, 0, r0, c3, c0 @ load domain access register
164
165 mrc p15, 0, r0, c1, c0 @ get control register v4
166 ldr r5, fa526_cr1_clear
167 bic r0, r0, r5
168 ldr r5, fa526_cr1_set
169 orr r0, r0, r5
170 mov pc, lr
171 .size __fa526_setup, . - __fa526_setup
172
173 /*
174 * .RVI ZFRS BLDP WCAM
175 * ..11 1001 .111 1101
176 *
177 */
178 .type fa526_cr1_clear, #object
179 .type fa526_cr1_set, #object
180fa526_cr1_clear:
181 .word 0x3f3f
182fa526_cr1_set:
183 .word 0x397D
184
185 __INITDATA
186
187/*
188 * Purpose : Function pointers used to access above functions - all calls
189 * come through these
190 */
191 .type fa526_processor_functions, #object
192fa526_processor_functions:
193 .word v4_early_abort
194 .word pabort_noifar
195 .word cpu_fa526_proc_init
196 .word cpu_fa526_proc_fin
197 .word cpu_fa526_reset
198 .word cpu_fa526_do_idle
199 .word cpu_fa526_dcache_clean_area
200 .word cpu_fa526_switch_mm
201 .word cpu_fa526_set_pte_ext
202 .size fa526_processor_functions, . - fa526_processor_functions
203
204 .section ".rodata"
205
206 .type cpu_arch_name, #object
207cpu_arch_name:
208 .asciz "armv4"
209 .size cpu_arch_name, . - cpu_arch_name
210
211 .type cpu_elf_name, #object
212cpu_elf_name:
213 .asciz "v4"
214 .size cpu_elf_name, . - cpu_elf_name
215
216 .type cpu_fa526_name, #object
217cpu_fa526_name:
218 .asciz "FA526"
219 .size cpu_fa526_name, . - cpu_fa526_name
220
221 .align
222
223 .section ".proc.info.init", #alloc, #execinstr
224
225 .type __fa526_proc_info,#object
226__fa526_proc_info:
227 .long 0x66015261
228 .long 0xff01fff1
229 .long PMD_TYPE_SECT | \
230 PMD_SECT_BUFFERABLE | \
231 PMD_SECT_CACHEABLE | \
232 PMD_BIT4 | \
233 PMD_SECT_AP_WRITE | \
234 PMD_SECT_AP_READ
235 .long PMD_TYPE_SECT | \
236 PMD_BIT4 | \
237 PMD_SECT_AP_WRITE | \
238 PMD_SECT_AP_READ
239 b __fa526_setup
240 .long cpu_arch_name
241 .long cpu_elf_name
242 .long HWCAP_SWP | HWCAP_HALF
243 .long cpu_fa526_name
244 .long fa526_processor_functions
245 .long fa_tlb_fns
246 .long fa_user_fns
247 .long fa_cache_fns
248 .size __fa526_proc_info, . - __fa526_proc_info