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/hwcap.h>
26 #include <mach/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
49 * cpu_sa1100_proc_fin()
51 * Prepare the CPU for reset:
52 * - Disable interrupts
53 * - Clean and turn off caches.
55 ENTRY(cpu_sa1100_proc_fin)
56 mcr p15, 0, ip, c15, c2, 2 @ Disable clock switching
57 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
58 bic r0, r0, #0x1000 @ ...i............
59 bic r0, r0, #0x000e @ ............wca.
60 mcr p15, 0, r0, c1, c0, 0 @ disable caches
64 * cpu_sa1100_reset(loc)
66 * Perform a soft reset of the system. Put the CPU into the
67 * same state as it would be if it had been reset, and branch
68 * to what would be the reset vector.
70 * loc: location to jump to for soft reset
73 ENTRY(cpu_sa1100_reset)
75 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
76 mcr p15, 0, ip, c7, c10, 4 @ drain WB
78 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
80 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
81 bic ip, ip, #0x000f @ ............wcam
82 bic ip, ip, #0x1100 @ ...i...s........
83 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
87 * cpu_sa1100_do_idle(type)
89 * Cause the processor to idle
94 * 2 = switch to slow processor clock
95 * 3 = switch to fast processor clock
98 ENTRY(cpu_sa1100_do_idle)
99 mov r0, r0 @ 4 nop padding
102 mov r0, r0 @ 4 nop padding
106 ldr r1, =UNCACHEABLE_ADDR @ ptr to uncacheable address
107 @ --- aligned to a cache line
108 mcr p15, 0, r0, c15, c2, 2 @ disable clock switching
109 ldr r1, [r1, #0] @ force switch to MCLK
110 mcr p15, 0, r0, c15, c8, 2 @ wait for interrupt
112 mcr p15, 0, r0, c15, c1, 2 @ enable clock switching
115 /* ================================= CACHE ================================ */
118 * cpu_sa1100_dcache_clean_area(addr,sz)
120 * Clean the specified entry of any caches such that the MMU
121 * translation fetches will obtain correct data.
123 * addr: cache-unaligned virtual address
126 ENTRY(cpu_sa1100_dcache_clean_area)
127 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
128 add r0, r0, #DCACHELINESIZE
129 subs r1, r1, #DCACHELINESIZE
133 /* =============================== PageTable ============================== */
136 * cpu_sa1100_switch_mm(pgd)
138 * Set the translation base pointer to be as described by pgd.
140 * pgd: new page tables
143 ENTRY(cpu_sa1100_switch_mm)
146 bl v4wb_flush_kern_cache_all @ clears IP
147 mcr p15, 0, ip, c9, c0, 0 @ invalidate RB
148 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
149 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
156 * cpu_sa1100_set_pte_ext(ptep, pte, ext)
158 * Set a PTE and flush it out
161 ENTRY(cpu_sa1100_set_pte_ext)
163 armv3_set_pte_ext wc_disable=0
165 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
166 mcr p15, 0, r0, c7, c10, 4 @ drain WB
170 .globl cpu_sa1100_suspend_size
171 .equ cpu_sa1100_suspend_size, 4*4
172 #ifdef CONFIG_PM_SLEEP
173 ENTRY(cpu_sa1100_do_suspend)
174 stmfd sp!, {r4 - r7, lr}
175 mrc p15, 0, r4, c3, c0, 0 @ domain ID
176 mrc p15, 0, r5, c2, c0, 0 @ translation table base addr
177 mrc p15, 0, r6, c13, c0, 0 @ PID
178 mrc p15, 0, r7, c1, c0, 0 @ control reg
179 stmia r0, {r4 - r7} @ store cp regs
180 ldmfd sp!, {r4 - r7, pc}
181 ENDPROC(cpu_sa1100_do_suspend)
183 ENTRY(cpu_sa1100_do_resume)
184 ldmia r0, {r4 - r7} @ load cp regs
186 mcr p15, 0, r1, c8, c7, 0 @ flush I+D TLBs
187 mcr p15, 0, r1, c7, c7, 0 @ flush I&D cache
188 mcr p15, 0, r1, c9, c0, 0 @ invalidate RB
189 mcr p15, 0, r1, c9, c0, 5 @ allow user space to use RB
191 mcr p15, 0, r4, c3, c0, 0 @ domain ID
192 mcr p15, 0, r5, c2, c0, 0 @ translation table base addr
193 mcr p15, 0, r6, c13, c0, 0 @ PID
194 mov r0, r7 @ control register
195 mov r2, r5, lsr #14 @ get TTB0 base
197 ldr r3, =PMD_TYPE_SECT | PMD_SECT_BUFFERABLE | \
198 PMD_SECT_CACHEABLE | PMD_SECT_AP_WRITE
200 ENDPROC(cpu_sa1100_do_resume)
205 .type __sa1100_setup, #function
208 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches on v4
209 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer on v4
211 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
215 mrc p15, 0, r0, c1, c0 @ get control register v4
219 .size __sa1100_setup, . - __sa1100_setup
223 * .RVI ZFRS BLDP WCAM
224 * ..11 0001 ..11 1101
227 .type sa1100_crval, #object
229 crval clear=0x00003f3f, mmuset=0x0000313d, ucset=0x00001130
234 * SA1100 and SA1110 share the same function calls
237 @ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
238 define_processor_functions sa1100, dabort=v4_early_abort, pabort=legacy_pabort, suspend=1
242 string cpu_arch_name, "armv4"
243 string cpu_elf_name, "v4"
244 string cpu_sa1100_name, "StrongARM-1100"
245 string cpu_sa1110_name, "StrongARM-1110"
249 .section ".proc.info.init", #alloc, #execinstr
251 .macro sa1100_proc_info name:req, cpu_val:req, cpu_mask:req, cpu_name:req
252 .type __\name\()_proc_info,#object
253 __\name\()_proc_info:
256 .long PMD_TYPE_SECT | \
257 PMD_SECT_BUFFERABLE | \
258 PMD_SECT_CACHEABLE | \
259 PMD_SECT_AP_WRITE | \
261 .long PMD_TYPE_SECT | \
262 PMD_SECT_AP_WRITE | \
267 .long HWCAP_SWP | HWCAP_HALF | HWCAP_26BIT | HWCAP_FAST_MULT
269 .long sa1100_processor_functions
273 .size __\name\()_proc_info, . - __\name\()_proc_info
276 sa1100_proc_info sa1100, 0x4401a110, 0xfffffff0, cpu_sa1100_name
277 sa1100_proc_info sa1110, 0x6901b110, 0xfffffff0, cpu_sa1110_name