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

source code of linux/arch/arm/mm/proc-fa526.S