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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * linux/arch/arm/mm/proc-fa526.S: MMU functions for FA526
4 *
5 * Written by : Luke Lee
6 * Copyright (C) 2005 Faraday Corp.
7 * Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
8 *
9 * These are the low level assembler for performing cache and TLB
10 * functions on the fa526.
11 */
12#include <linux/linkage.h>
13#include <linux/init.h>
14#include <linux/cfi_types.h>
15#include <linux/pgtable.h>
16#include <asm/assembler.h>
17#include <asm/hwcap.h>
18#include <asm/pgtable-hwdef.h>
19#include <asm/page.h>
20#include <asm/ptrace.h>
21
22#include "proc-macros.S"
23
24#define CACHE_DLINESIZE 16
25
26 .text
27/*
28 * cpu_fa526_proc_init()
29 */
30SYM_TYPED_FUNC_START(cpu_fa526_proc_init)
31 ret lr
32SYM_FUNC_END(cpu_fa526_proc_init)
33
34/*
35 * cpu_fa526_proc_fin()
36 */
37SYM_TYPED_FUNC_START(cpu_fa526_proc_fin)
38 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
39 bic r0, r0, #0x1000 @ ...i............
40 bic r0, r0, #0x000e @ ............wca.
41 mcr p15, 0, r0, c1, c0, 0 @ disable caches
42 nop
43 nop
44 ret lr
45SYM_FUNC_END(cpu_fa526_proc_fin)
46
47/*
48 * cpu_fa526_reset(loc)
49 *
50 * Perform a soft reset of the system. Put the CPU into the
51 * same state as it would be if it had been reset, and branch
52 * to what would be the reset vector.
53 *
54 * loc: location to jump to for soft reset
55 */
56 .align 4
57 .pushsection .idmap.text, "ax"
58SYM_TYPED_FUNC_START(cpu_fa526_reset)
59/* TODO: Use CP8 if possible... */
60 mov ip, #0
61 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
62 mcr p15, 0, ip, c7, c10, 4 @ drain WB
63#ifdef CONFIG_MMU
64 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
65#endif
66 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
67 bic ip, ip, #0x000f @ ............wcam
68 bic ip, ip, #0x1100 @ ...i...s........
69 bic ip, ip, #0x0800 @ BTB off
70 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
71 nop
72 nop
73 ret r0
74SYM_FUNC_END(cpu_fa526_reset)
75 .popsection
76
77/*
78 * cpu_fa526_do_idle()
79 */
80 .align 4
81SYM_TYPED_FUNC_START(cpu_fa526_do_idle)
82 ret lr
83SYM_FUNC_END(cpu_fa526_do_idle)
84
85SYM_TYPED_FUNC_START(cpu_fa526_dcache_clean_area)
861: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
87 add r0, r0, #CACHE_DLINESIZE
88 subs r1, r1, #CACHE_DLINESIZE
89 bhi 1b
90 mcr p15, 0, r0, c7, c10, 4 @ drain WB
91 ret lr
92SYM_FUNC_END(cpu_fa526_dcache_clean_area)
93
94/* =============================== PageTable ============================== */
95
96/*
97 * cpu_fa526_switch_mm(pgd)
98 *
99 * Set the translation base pointer to be as described by pgd.
100 *
101 * pgd: new page tables
102 */
103 .align 4
104SYM_TYPED_FUNC_START(cpu_fa526_switch_mm)
105#ifdef CONFIG_MMU
106 mov ip, #0
107#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
108 mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache
109#else
110 mcr p15, 0, ip, c7, c14, 0 @ clean and invalidate whole D cache
111#endif
112 mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
113 mcr p15, 0, ip, c7, c5, 6 @ invalidate BTB since mm changed
114 mcr p15, 0, ip, c7, c10, 4 @ data write barrier
115 mcr p15, 0, ip, c7, c5, 4 @ prefetch flush
116 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
117 mcr p15, 0, ip, c8, c7, 0 @ invalidate UTLB
118#endif
119 ret lr
120SYM_FUNC_END(cpu_fa526_switch_mm)
121
122/*
123 * cpu_fa526_set_pte_ext(ptep, pte, ext)
124 *
125 * Set a PTE and flush it out
126 */
127 .align 4
128SYM_TYPED_FUNC_START(cpu_fa526_set_pte_ext)
129#ifdef CONFIG_MMU
130 armv3_set_pte_ext
131 mov r0, r0
132 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
133 mov r0, #0
134 mcr p15, 0, r0, c7, c10, 4 @ drain WB
135#endif
136 ret lr
137SYM_FUNC_END(cpu_fa526_set_pte_ext)
138
139 .type __fa526_setup, #function
140__fa526_setup:
141 /* On return of this routine, r0 must carry correct flags for CFG register */
142 mov r0, #0
143 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
144 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
145#ifdef CONFIG_MMU
146 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
147#endif
148 mcr p15, 0, r0, c7, c5, 5 @ invalidate IScratchpad RAM
149
150 mov r0, #1
151 mcr p15, 0, r0, c1, c1, 0 @ turn-on ECR
152
153 mov r0, #0
154 mcr p15, 0, r0, c7, c5, 6 @ invalidate BTB All
155 mcr p15, 0, r0, c7, c10, 4 @ data write barrier
156 mcr p15, 0, r0, c7, c5, 4 @ prefetch flush
157
158 mov r0, #0x1f @ Domains 0, 1 = manager, 2 = client
159 mcr p15, 0, r0, c3, c0 @ load domain access register
160
161 mrc p15, 0, r0, c1, c0 @ get control register v4
162 ldr r5, fa526_cr1_clear
163 bic r0, r0, r5
164 ldr r5, fa526_cr1_set
165 orr r0, r0, r5
166 ret lr
167 .size __fa526_setup, . - __fa526_setup
168
169 /*
170 * .RVI ZFRS BLDP WCAM
171 * ..11 1001 .111 1101
172 *
173 */
174 .type fa526_cr1_clear, #object
175 .type fa526_cr1_set, #object
176fa526_cr1_clear:
177 .word 0x3f3f
178fa526_cr1_set:
179 .word 0x397D
180
181 __INITDATA
182
183 @ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
184 define_processor_functions fa526, dabort=v4_early_abort, pabort=legacy_pabort
185
186 .section ".rodata"
187
188 string cpu_arch_name, "armv4"
189 string cpu_elf_name, "v4"
190 string cpu_fa526_name, "FA526"
191
192 .align
193
194 .section ".proc.info.init", "a"
195
196 .type __fa526_proc_info,#object
197__fa526_proc_info:
198 .long 0x66015261
199 .long 0xff01fff1
200 .long PMD_TYPE_SECT | \
201 PMD_SECT_BUFFERABLE | \
202 PMD_SECT_CACHEABLE | \
203 PMD_BIT4 | \
204 PMD_SECT_AP_WRITE | \
205 PMD_SECT_AP_READ
206 .long PMD_TYPE_SECT | \
207 PMD_BIT4 | \
208 PMD_SECT_AP_WRITE | \
209 PMD_SECT_AP_READ
210 initfn __fa526_setup, __fa526_proc_info
211 .long cpu_arch_name
212 .long cpu_elf_name
213 .long HWCAP_SWP | HWCAP_HALF
214 .long cpu_fa526_name
215 .long fa526_processor_functions
216 .long fa_tlb_fns
217 .long fa_user_fns
218 .long fa_cache_fns
219 .size __fa526_proc_info, . - __fa526_proc_info
1/*
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
26#include "proc-macros.S"
27
28#define CACHE_DLINESIZE 16
29
30 .text
31/*
32 * cpu_fa526_proc_init()
33 */
34ENTRY(cpu_fa526_proc_init)
35 mov pc, lr
36
37/*
38 * cpu_fa526_proc_fin()
39 */
40ENTRY(cpu_fa526_proc_fin)
41 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
42 bic r0, r0, #0x1000 @ ...i............
43 bic r0, r0, #0x000e @ ............wca.
44 mcr p15, 0, r0, c1, c0, 0 @ disable caches
45 nop
46 nop
47 mov pc, lr
48
49/*
50 * cpu_fa526_reset(loc)
51 *
52 * Perform a soft reset of the system. Put the CPU into the
53 * same state as it would be if it had been reset, and branch
54 * to what would be the reset vector.
55 *
56 * loc: location to jump to for soft reset
57 */
58 .align 4
59 .pushsection .idmap.text, "ax"
60ENTRY(cpu_fa526_reset)
61/* TODO: Use CP8 if possible... */
62 mov ip, #0
63 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
64 mcr p15, 0, ip, c7, c10, 4 @ drain WB
65#ifdef CONFIG_MMU
66 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
67#endif
68 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
69 bic ip, ip, #0x000f @ ............wcam
70 bic ip, ip, #0x1100 @ ...i...s........
71 bic ip, ip, #0x0800 @ BTB off
72 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
73 nop
74 nop
75 mov pc, r0
76ENDPROC(cpu_fa526_reset)
77 .popsection
78
79/*
80 * cpu_fa526_do_idle()
81 */
82 .align 4
83ENTRY(cpu_fa526_do_idle)
84 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
85 mov pc, lr
86
87
88ENTRY(cpu_fa526_dcache_clean_area)
891: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
90 add r0, r0, #CACHE_DLINESIZE
91 subs r1, r1, #CACHE_DLINESIZE
92 bhi 1b
93 mcr p15, 0, r0, c7, c10, 4 @ drain WB
94 mov pc, lr
95
96/* =============================== PageTable ============================== */
97
98/*
99 * cpu_fa526_switch_mm(pgd)
100 *
101 * Set the translation base pointer to be as described by pgd.
102 *
103 * pgd: new page tables
104 */
105 .align 4
106ENTRY(cpu_fa526_switch_mm)
107#ifdef CONFIG_MMU
108 mov ip, #0
109#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
110 mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache
111#else
112 mcr p15, 0, ip, c7, c14, 0 @ clean and invalidate whole D cache
113#endif
114 mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
115 mcr p15, 0, ip, c7, c5, 6 @ invalidate BTB since mm changed
116 mcr p15, 0, ip, c7, c10, 4 @ data write barrier
117 mcr p15, 0, ip, c7, c5, 4 @ prefetch flush
118 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
119 mcr p15, 0, ip, c8, c7, 0 @ invalidate UTLB
120#endif
121 mov pc, lr
122
123/*
124 * cpu_fa526_set_pte_ext(ptep, pte, ext)
125 *
126 * Set a PTE and flush it out
127 */
128 .align 4
129ENTRY(cpu_fa526_set_pte_ext)
130#ifdef CONFIG_MMU
131 armv3_set_pte_ext
132 mov r0, r0
133 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
134 mov r0, #0
135 mcr p15, 0, r0, c7, c10, 4 @ drain WB
136#endif
137 mov pc, lr
138
139 __CPUINIT
140
141 .type __fa526_setup, #function
142__fa526_setup:
143 /* On return of this routine, r0 must carry correct flags for CFG register */
144 mov r0, #0
145 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
146 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
147#ifdef CONFIG_MMU
148 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
149#endif
150 mcr p15, 0, r0, c7, c5, 5 @ invalidate IScratchpad RAM
151
152 mov r0, #1
153 mcr p15, 0, r0, c1, c1, 0 @ turn-on ECR
154
155 mov r0, #0
156 mcr p15, 0, r0, c7, c5, 6 @ invalidate BTB All
157 mcr p15, 0, r0, c7, c10, 4 @ data write barrier
158 mcr p15, 0, r0, c7, c5, 4 @ prefetch flush
159
160 mov r0, #0x1f @ Domains 0, 1 = manager, 2 = client
161 mcr p15, 0, r0, c3, c0 @ load domain access register
162
163 mrc p15, 0, r0, c1, c0 @ get control register v4
164 ldr r5, fa526_cr1_clear
165 bic r0, r0, r5
166 ldr r5, fa526_cr1_set
167 orr r0, r0, r5
168 mov pc, lr
169 .size __fa526_setup, . - __fa526_setup
170
171 /*
172 * .RVI ZFRS BLDP WCAM
173 * ..11 1001 .111 1101
174 *
175 */
176 .type fa526_cr1_clear, #object
177 .type fa526_cr1_set, #object
178fa526_cr1_clear:
179 .word 0x3f3f
180fa526_cr1_set:
181 .word 0x397D
182
183 __INITDATA
184
185 @ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
186 define_processor_functions fa526, dabort=v4_early_abort, pabort=legacy_pabort
187
188 .section ".rodata"
189
190 string cpu_arch_name, "armv4"
191 string cpu_elf_name, "v4"
192 string cpu_fa526_name, "FA526"
193
194 .align
195
196 .section ".proc.info.init", #alloc, #execinstr
197
198 .type __fa526_proc_info,#object
199__fa526_proc_info:
200 .long 0x66015261
201 .long 0xff01fff1
202 .long PMD_TYPE_SECT | \
203 PMD_SECT_BUFFERABLE | \
204 PMD_SECT_CACHEABLE | \
205 PMD_BIT4 | \
206 PMD_SECT_AP_WRITE | \
207 PMD_SECT_AP_READ
208 .long PMD_TYPE_SECT | \
209 PMD_BIT4 | \
210 PMD_SECT_AP_WRITE | \
211 PMD_SECT_AP_READ
212 b __fa526_setup
213 .long cpu_arch_name
214 .long cpu_elf_name
215 .long HWCAP_SWP | HWCAP_HALF
216 .long cpu_fa526_name
217 .long fa526_processor_functions
218 .long fa_tlb_fns
219 .long fa_user_fns
220 .long fa_cache_fns
221 .size __fa526_proc_info, . - __fa526_proc_info