1 /* SPDX-License-Identifier: GPL-2.0-or-later *
2 /*
3 * linux/arch/arm/mm/proc-fa526.S: MMU functi
4 *
5 * Written by : Luke Lee
6 * Copyright (C) 2005 Faraday Corp.
7 * Copyright (C) 2008-2009 Paulius Zaleckas <p
8 *
9 * These are the low level assembler for perfo
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 */
30 SYM_TYPED_FUNC_START(cpu_fa526_proc_init)
31 ret lr
32 SYM_FUNC_END(cpu_fa526_proc_init)
33
34 /*
35 * cpu_fa526_proc_fin()
36 */
37 SYM_TYPED_FUNC_START(cpu_fa526_proc_fin)
38 mrc p15, 0, r0, c1, c0, 0
39 bic r0, r0, #0x1000
40 bic r0, r0, #0x000e
41 mcr p15, 0, r0, c1, c0, 0
42 nop
43 nop
44 ret lr
45 SYM_FUNC_END(cpu_fa526_proc_fin)
46
47 /*
48 * cpu_fa526_reset(loc)
49 *
50 * Perform a soft reset of the system. Put th
51 * same state as it would be if it had been re
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"
58 SYM_TYPED_FUNC_START(cpu_fa526_reset)
59 /* TODO: Use CP8 if possible... */
60 mov ip, #0
61 mcr p15, 0, ip, c7, c7, 0
62 mcr p15, 0, ip, c7, c10, 4
63 #ifdef CONFIG_MMU
64 mcr p15, 0, ip, c8, c7, 0
65 #endif
66 mrc p15, 0, ip, c1, c0, 0
67 bic ip, ip, #0x000f
68 bic ip, ip, #0x1100
69 bic ip, ip, #0x0800
70 mcr p15, 0, ip, c1, c0, 0
71 nop
72 nop
73 ret r0
74 SYM_FUNC_END(cpu_fa526_reset)
75 .popsection
76
77 /*
78 * cpu_fa526_do_idle()
79 */
80 .align 4
81 SYM_TYPED_FUNC_START(cpu_fa526_do_idle)
82 ret lr
83 SYM_FUNC_END(cpu_fa526_do_idle)
84
85 SYM_TYPED_FUNC_START(cpu_fa526_dcache_clean_ar
86 1: mcr p15, 0, r0, c7, c10, 1
87 add r0, r0, #CACHE_DLINESIZE
88 subs r1, r1, #CACHE_DLINESIZE
89 bhi 1b
90 mcr p15, 0, r0, c7, c10, 4
91 ret lr
92 SYM_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 d
100 *
101 * pgd: new page tables
102 */
103 .align 4
104 SYM_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
109 #else
110 mcr p15, 0, ip, c7, c14, 0
111 #endif
112 mcr p15, 0, ip, c7, c5, 0
113 mcr p15, 0, ip, c7, c5, 6
114 mcr p15, 0, ip, c7, c10, 4
115 mcr p15, 0, ip, c7, c5, 4
116 mcr p15, 0, r0, c2, c0, 0
117 mcr p15, 0, ip, c8, c7, 0
118 #endif
119 ret lr
120 SYM_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
128 SYM_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
133 mov r0, #0
134 mcr p15, 0, r0, c7, c10, 4
135 #endif
136 ret lr
137 SYM_FUNC_END(cpu_fa526_set_pte_ext)
138
139 .type __fa526_setup, #function
140 __fa526_setup:
141 /* On return of this routine, r0 must
142 mov r0, #0
143 mcr p15, 0, r0, c7, c7
144 mcr p15, 0, r0, c7, c10, 4
145 #ifdef CONFIG_MMU
146 mcr p15, 0, r0, c8, c7
147 #endif
148 mcr p15, 0, r0, c7, c5, 5
149
150 mov r0, #1
151 mcr p15, 0, r0, c1, c1, 0
152
153 mov r0, #0
154 mcr p15, 0, r0, c7, c5, 6
155 mcr p15, 0, r0, c7, c10, 4
156 mcr p15, 0, r0, c7, c5, 4
157
158 mov r0, #0x1f
159 mcr p15, 0, r0, c3, c0
160
161 mrc p15, 0, r0, c1, c0
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_set
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
176 fa526_cr1_clear:
177 .word 0x3f3f
178 fa526_cr1_set:
179 .word 0x397D
180
181 __INITDATA
182
183 @ define struct processor (see <asm/pr
184 define_processor_functions fa526, dabo
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_in
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
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