2 * linux/arch/arm/mm/proc-fa526.S: MMU functions for FA526
4 * Written by : Luke Lee
5 * Copyright (C) 2005 Faraday Corp.
6 * Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
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.
14 * These are the low level assembler for performing cache and TLB
15 * functions on the fa526.
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>
24 #include <asm/ptrace.h>
25 #include <asm/system.h>
27 #include "proc-macros.S"
29 #define CACHE_DLINESIZE 16
33 * cpu_fa526_proc_init()
35 ENTRY(cpu_fa526_proc_init)
39 * cpu_fa526_proc_fin()
41 ENTRY(cpu_fa526_proc_fin)
42 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
43 bic r0, r0, #0x1000 @ ...i............
44 bic r0, r0, #0x000e @ ............wca.
45 mcr p15, 0, r0, c1, c0, 0 @ disable caches
51 * cpu_fa526_reset(loc)
53 * Perform a soft reset of the system. Put the CPU into the
54 * same state as it would be if it had been reset, and branch
55 * to what would be the reset vector.
57 * loc: location to jump to for soft reset
60 .pushsection .idmap.text, "ax"
61 ENTRY(cpu_fa526_reset)
62 /* TODO: Use CP8 if possible... */
64 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
65 mcr p15, 0, ip, c7, c10, 4 @ drain WB
67 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
69 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
70 bic ip, ip, #0x000f @ ............wcam
71 bic ip, ip, #0x1100 @ ...i...s........
72 bic ip, ip, #0x0800 @ BTB off
73 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
77 ENDPROC(cpu_fa526_reset)
84 ENTRY(cpu_fa526_do_idle)
85 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
89 ENTRY(cpu_fa526_dcache_clean_area)
90 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
91 add r0, r0, #CACHE_DLINESIZE
92 subs r1, r1, #CACHE_DLINESIZE
94 mcr p15, 0, r0, c7, c10, 4 @ drain WB
97 /* =============================== PageTable ============================== */
100 * cpu_fa526_switch_mm(pgd)
102 * Set the translation base pointer to be as described by pgd.
104 * pgd: new page tables
107 ENTRY(cpu_fa526_switch_mm)
110 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
111 mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache
113 mcr p15, 0, ip, c7, c14, 0 @ clean and invalidate whole D cache
115 mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
116 mcr p15, 0, ip, c7, c5, 6 @ invalidate BTB since mm changed
117 mcr p15, 0, ip, c7, c10, 4 @ data write barrier
118 mcr p15, 0, ip, c7, c5, 4 @ prefetch flush
119 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
120 mcr p15, 0, ip, c8, c7, 0 @ invalidate UTLB
125 * cpu_fa526_set_pte_ext(ptep, pte, ext)
127 * Set a PTE and flush it out
130 ENTRY(cpu_fa526_set_pte_ext)
134 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
136 mcr p15, 0, r0, c7, c10, 4 @ drain WB
142 .type __fa526_setup, #function
144 /* On return of this routine, r0 must carry correct flags for CFG register */
146 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
147 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
149 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
151 mcr p15, 0, r0, c7, c5, 5 @ invalidate IScratchpad RAM
154 mcr p15, 0, r0, c1, c1, 0 @ turn-on ECR
157 mcr p15, 0, r0, c7, c5, 6 @ invalidate BTB All
158 mcr p15, 0, r0, c7, c10, 4 @ data write barrier
159 mcr p15, 0, r0, c7, c5, 4 @ prefetch flush
161 mov r0, #0x1f @ Domains 0, 1 = manager, 2 = client
162 mcr p15, 0, r0, c3, c0 @ load domain access register
164 mrc p15, 0, r0, c1, c0 @ get control register v4
165 ldr r5, fa526_cr1_clear
167 ldr r5, fa526_cr1_set
170 .size __fa526_setup, . - __fa526_setup
173 * .RVI ZFRS BLDP WCAM
174 * ..11 1001 .111 1101
177 .type fa526_cr1_clear, #object
178 .type fa526_cr1_set, #object
186 @ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
187 define_processor_functions fa526, dabort=v4_early_abort, pabort=legacy_pabort
191 string cpu_arch_name, "armv4"
192 string cpu_elf_name, "v4"
193 string cpu_fa526_name, "FA526"
197 .section ".proc.info.init", #alloc, #execinstr
199 .type __fa526_proc_info,#object
203 .long PMD_TYPE_SECT | \
204 PMD_SECT_BUFFERABLE | \
205 PMD_SECT_CACHEABLE | \
207 PMD_SECT_AP_WRITE | \
209 .long PMD_TYPE_SECT | \
211 PMD_SECT_AP_WRITE | \
216 .long HWCAP_SWP | HWCAP_HALF
218 .long fa526_processor_functions
222 .size __fa526_proc_info, . - __fa526_proc_info