2 * linux/arch/arm/mm/proc-sa110.S
4 * Copyright (C) 1997-2002 Russell King
5 * hacked for non-paged-MM by Hyok S. Choi, 2003.
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
11 * MMU functions for SA110
13 * These are the low level assembler for performing cache and TLB
14 * functions on the StrongARM-110.
16 #include <linux/linkage.h>
17 #include <linux/init.h>
18 #include <asm/assembler.h>
19 #include <asm/asm-offsets.h>
20 #include <asm/hwcap.h>
21 #include <mach/hardware.h>
22 #include <asm/pgtable-hwdef.h>
23 #include <asm/pgtable.h>
24 #include <asm/ptrace.h>
26 #include "proc-macros.S"
29 * the cache line size of the I and D cache
31 #define DCACHELINESIZE 32
36 * cpu_sa110_proc_init()
38 ENTRY(cpu_sa110_proc_init)
40 mcr p15, 0, r0, c15, c1, 2 @ Enable clock switching
44 * cpu_sa110_proc_fin()
46 ENTRY(cpu_sa110_proc_fin)
48 mcr p15, 0, r0, c15, c2, 2 @ Disable clock switching
49 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
50 bic r0, r0, #0x1000 @ ...i............
51 bic r0, r0, #0x000e @ ............wca.
52 mcr p15, 0, r0, c1, c0, 0 @ disable caches
56 * cpu_sa110_reset(loc)
58 * Perform a soft reset of the system. Put the CPU into the
59 * same state as it would be if it had been reset, and branch
60 * to what would be the reset vector.
62 * loc: location to jump to for soft reset
65 .pushsection .idmap.text, "ax"
66 ENTRY(cpu_sa110_reset)
68 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
69 mcr p15, 0, ip, c7, c10, 4 @ drain WB
71 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
73 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
74 bic ip, ip, #0x000f @ ............wcam
75 bic ip, ip, #0x1100 @ ...i...s........
76 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
78 ENDPROC(cpu_sa110_reset)
82 * cpu_sa110_do_idle(type)
84 * Cause the processor to idle
89 * 2 = switch to slow processor clock
90 * 3 = switch to fast processor clock
94 ENTRY(cpu_sa110_do_idle)
95 mcr p15, 0, ip, c15, c2, 2 @ disable clock switching
96 ldr r1, =UNCACHEABLE_ADDR @ load from uncacheable loc
97 ldr r1, [r1, #0] @ force switch to MCLK
101 mcr p15, 0, r0, c15, c8, 2 @ Wait for interrupt, cache aligned
105 mcr p15, 0, r0, c15, c1, 2 @ enable clock switching
108 /* ================================= CACHE ================================ */
111 * cpu_sa110_dcache_clean_area(addr,sz)
113 * Clean the specified entry of any caches such that the MMU
114 * translation fetches will obtain correct data.
116 * addr: cache-unaligned virtual address
119 ENTRY(cpu_sa110_dcache_clean_area)
120 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
121 add r0, r0, #DCACHELINESIZE
122 subs r1, r1, #DCACHELINESIZE
126 /* =============================== PageTable ============================== */
129 * cpu_sa110_switch_mm(pgd)
131 * Set the translation base pointer to be as described by pgd.
133 * pgd: new page tables
136 ENTRY(cpu_sa110_switch_mm)
139 bl v4wb_flush_kern_cache_all @ clears IP
140 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
141 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
148 * cpu_sa110_set_pte_ext(ptep, pte, ext)
150 * Set a PTE and flush it out
153 ENTRY(cpu_sa110_set_pte_ext)
155 armv3_set_pte_ext wc_disable=0
157 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
158 mcr p15, 0, r0, c7, c10, 4 @ drain WB
164 .type __sa110_setup, #function
167 mcr p15, 0, r10, c7, c7 @ invalidate I,D caches on v4
168 mcr p15, 0, r10, c7, c10, 4 @ drain write buffer on v4
170 mcr p15, 0, r10, c8, c7 @ invalidate I,D TLBs on v4
175 mrc p15, 0, r0, c1, c0 @ get control register v4
179 .size __sa110_setup, . - __sa110_setup
183 * .RVI ZFRS BLDP WCAM
184 * ..01 0001 ..11 1101
187 .type sa110_crval, #object
189 crval clear=0x00003f3f, mmuset=0x0000113d, ucset=0x00001130
193 @ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
194 define_processor_functions sa110, dabort=v4_early_abort, pabort=legacy_pabort
198 string cpu_arch_name, "armv4"
199 string cpu_elf_name, "v4"
200 string cpu_sa110_name, "StrongARM-110"
204 .section ".proc.info.init", #alloc, #execinstr
206 .type __sa110_proc_info,#object
210 .long PMD_TYPE_SECT | \
211 PMD_SECT_BUFFERABLE | \
212 PMD_SECT_CACHEABLE | \
213 PMD_SECT_AP_WRITE | \
215 .long PMD_TYPE_SECT | \
216 PMD_SECT_AP_WRITE | \
221 .long HWCAP_SWP | HWCAP_HALF | HWCAP_26BIT | HWCAP_FAST_MULT
223 .long sa110_processor_functions
227 .size __sa110_proc_info, . - __sa110_proc_info