2 * linux/arch/arm/mm/proc-sa1100.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-1100 and StrongARM-1110.
16 * Note that SA1100 and SA1110 share everything but their name and CPU ID.
18 * 12-jun-2000, Erik Mouw (J.A.K.Mouw@its.tudelft.nl):
19 * Flush the read buffer at context switches
21 #include <linux/linkage.h>
22 #include <linux/init.h>
23 #include <asm/assembler.h>
24 #include <asm/asm-offsets.h>
25 #include <asm/procinfo.h>
26 #include <asm/hardware.h>
27 #include <asm/pgtable-hwdef.h>
28 #include <asm/pgtable.h>
30 #include "proc-macros.S"
33 * the cache line size of the I and D cache
35 #define DCACHELINESIZE 32
40 * cpu_sa1100_proc_init()
42 ENTRY(cpu_sa1100_proc_init)
44 mcr p15, 0, r0, c15, c1, 2 @ Enable clock switching
45 mcr p15, 0, r0, c9, c0, 5 @ Allow read-buffer operations from userland
51 * cpu_sa1100_proc_fin()
53 * Prepare the CPU for reset:
54 * - Disable interrupts
55 * - Clean and turn off caches.
57 ENTRY(cpu_sa1100_proc_fin)
59 mov ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
61 bl v4wb_flush_kern_cache_all
62 mcr p15, 0, ip, c15, c2, 2 @ Disable clock switching
63 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
64 bic r0, r0, #0x1000 @ ...i............
65 bic r0, r0, #0x000e @ ............wca.
66 mcr p15, 0, r0, c1, c0, 0 @ disable caches
70 * cpu_sa1100_reset(loc)
72 * Perform a soft reset of the system. Put the CPU into the
73 * same state as it would be if it had been reset, and branch
74 * to what would be the reset vector.
76 * loc: location to jump to for soft reset
79 ENTRY(cpu_sa1100_reset)
81 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
82 mcr p15, 0, ip, c7, c10, 4 @ drain WB
84 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
86 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
87 bic ip, ip, #0x000f @ ............wcam
88 bic ip, ip, #0x1100 @ ...i...s........
89 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
93 * cpu_sa1100_do_idle(type)
95 * Cause the processor to idle
100 * 2 = switch to slow processor clock
101 * 3 = switch to fast processor clock
104 ENTRY(cpu_sa1100_do_idle)
105 mov r0, r0 @ 4 nop padding
108 mov r0, r0 @ 4 nop padding
112 ldr r1, =UNCACHEABLE_ADDR @ ptr to uncacheable address
113 @ --- aligned to a cache line
114 mcr p15, 0, r0, c15, c2, 2 @ disable clock switching
115 ldr r1, [r1, #0] @ force switch to MCLK
116 mcr p15, 0, r0, c15, c8, 2 @ wait for interrupt
118 mcr p15, 0, r0, c15, c1, 2 @ enable clock switching
121 /* ================================= CACHE ================================ */
124 * cpu_sa1100_dcache_clean_area(addr,sz)
126 * Clean the specified entry of any caches such that the MMU
127 * translation fetches will obtain correct data.
129 * addr: cache-unaligned virtual address
132 ENTRY(cpu_sa1100_dcache_clean_area)
133 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
134 add r0, r0, #DCACHELINESIZE
135 subs r1, r1, #DCACHELINESIZE
139 /* =============================== PageTable ============================== */
142 * cpu_sa1100_switch_mm(pgd)
144 * Set the translation base pointer to be as described by pgd.
146 * pgd: new page tables
149 ENTRY(cpu_sa1100_switch_mm)
152 bl v4wb_flush_kern_cache_all @ clears IP
153 mcr p15, 0, ip, c9, c0, 0 @ invalidate RB
154 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
155 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
162 * cpu_sa1100_set_pte(ptep, pte)
164 * Set a PTE and flush it out
167 ENTRY(cpu_sa1100_set_pte)
169 str r1, [r0], #-2048 @ linux version
171 eor r1, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY
173 bic r2, r1, #PTE_SMALL_AP_MASK
174 bic r2, r2, #PTE_TYPE_MASK
175 orr r2, r2, #PTE_TYPE_SMALL
177 tst r1, #L_PTE_USER @ User?
178 orrne r2, r2, #PTE_SMALL_AP_URO_SRW
180 tst r1, #L_PTE_WRITE | L_PTE_DIRTY @ Write and Dirty?
181 orreq r2, r2, #PTE_SMALL_AP_UNO_SRW
183 tst r1, #L_PTE_PRESENT | L_PTE_YOUNG @ Present and Young?
186 str r2, [r0] @ hardware version
188 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
189 mcr p15, 0, r0, c7, c10, 4 @ drain WB
195 .type __sa1100_setup, #function
198 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
199 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
201 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
205 mrc p15, 0, r0, c1, c0 @ get control register v4
209 .size __sa1100_setup, . - __sa1100_setup
213 * .RVI ZFRS BLDP WCAM
214 * ..11 0001 ..11 1101
217 .type sa1100_crval, #object
219 crval clear=0x00003f3f, mmuset=0x0000313d, ucset=0x00001130
224 * Purpose : Function pointers used to access above functions - all calls
229 * SA1100 and SA1110 share the same function calls
231 .type sa1100_processor_functions, #object
232 ENTRY(sa1100_processor_functions)
234 .word cpu_sa1100_proc_init
235 .word cpu_sa1100_proc_fin
236 .word cpu_sa1100_reset
237 .word cpu_sa1100_do_idle
238 .word cpu_sa1100_dcache_clean_area
239 .word cpu_sa1100_switch_mm
240 .word cpu_sa1100_set_pte
241 .size sa1100_processor_functions, . - sa1100_processor_functions
245 .type cpu_arch_name, #object
248 .size cpu_arch_name, . - cpu_arch_name
250 .type cpu_elf_name, #object
253 .size cpu_elf_name, . - cpu_elf_name
255 .type cpu_sa1100_name, #object
257 .asciz "StrongARM-1100"
258 .size cpu_sa1100_name, . - cpu_sa1100_name
260 .type cpu_sa1110_name, #object
262 .asciz "StrongARM-1110"
263 .size cpu_sa1110_name, . - cpu_sa1110_name
267 .section ".proc.info.init", #alloc, #execinstr
269 .type __sa1100_proc_info,#object
273 .long PMD_TYPE_SECT | \
274 PMD_SECT_BUFFERABLE | \
275 PMD_SECT_CACHEABLE | \
276 PMD_SECT_AP_WRITE | \
278 .long PMD_TYPE_SECT | \
279 PMD_SECT_AP_WRITE | \
284 .long HWCAP_SWP | HWCAP_HALF | HWCAP_26BIT | HWCAP_FAST_MULT
285 .long cpu_sa1100_name
286 .long sa1100_processor_functions
290 .size __sa1100_proc_info, . - __sa1100_proc_info
292 .type __sa1110_proc_info,#object
296 .long PMD_TYPE_SECT | \
297 PMD_SECT_BUFFERABLE | \
298 PMD_SECT_CACHEABLE | \
299 PMD_SECT_AP_WRITE | \
301 .long PMD_TYPE_SECT | \
302 PMD_SECT_AP_WRITE | \
307 .long HWCAP_SWP | HWCAP_HALF | HWCAP_26BIT | HWCAP_FAST_MULT
308 .long cpu_sa1110_name
309 .long sa1100_processor_functions
313 .size __sa1110_proc_info, . - __sa1110_proc_info