1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * linux/arch/arm/mm/proc-sa110.S
5 * Copyright (C) 1997-2002 Russell King
6 * hacked for non-paged-MM by Hyok S. Choi, 2003.
8 * MMU functions for SA110
10 * These are the low level assembler for performing cache and TLB
11 * functions on the StrongARM-110.
13 #include <linux/linkage.h>
14 #include <linux/init.h>
15 #include <linux/pgtable.h>
16 #include <asm/assembler.h>
17 #include <asm/asm-offsets.h>
18 #include <asm/hwcap.h>
19 #include <mach/hardware.h>
20 #include <asm/pgtable-hwdef.h>
21 #include <asm/ptrace.h>
23 #include "proc-macros.S"
26 * the cache line size of the I and D cache
28 #define DCACHELINESIZE 32
33 * cpu_sa110_proc_init()
35 ENTRY(cpu_sa110_proc_init)
37 mcr p15, 0, r0, c15, c1, 2 @ Enable clock switching
41 * cpu_sa110_proc_fin()
43 ENTRY(cpu_sa110_proc_fin)
45 mcr p15, 0, r0, c15, c2, 2 @ Disable clock switching
46 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
47 bic r0, r0, #0x1000 @ ...i............
48 bic r0, r0, #0x000e @ ............wca.
49 mcr p15, 0, r0, c1, c0, 0 @ disable caches
53 * cpu_sa110_reset(loc)
55 * Perform a soft reset of the system. Put the CPU into the
56 * same state as it would be if it had been reset, and branch
57 * to what would be the reset vector.
59 * loc: location to jump to for soft reset
62 .pushsection .idmap.text, "ax"
63 ENTRY(cpu_sa110_reset)
65 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
66 mcr p15, 0, ip, c7, c10, 4 @ drain WB
68 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
70 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
71 bic ip, ip, #0x000f @ ............wcam
72 bic ip, ip, #0x1100 @ ...i...s........
73 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
75 ENDPROC(cpu_sa110_reset)
79 * cpu_sa110_do_idle(type)
81 * Cause the processor to idle
86 * 2 = switch to slow processor clock
87 * 3 = switch to fast processor clock
91 ENTRY(cpu_sa110_do_idle)
92 mcr p15, 0, ip, c15, c2, 2 @ disable clock switching
93 ldr r1, =UNCACHEABLE_ADDR @ load from uncacheable loc
94 ldr r1, [r1, #0] @ force switch to MCLK
98 mcr p15, 0, r0, c15, c8, 2 @ Wait for interrupt, cache aligned
102 mcr p15, 0, r0, c15, c1, 2 @ enable clock switching
105 /* ================================= CACHE ================================ */
108 * cpu_sa110_dcache_clean_area(addr,sz)
110 * Clean the specified entry of any caches such that the MMU
111 * translation fetches will obtain correct data.
113 * addr: cache-unaligned virtual address
116 ENTRY(cpu_sa110_dcache_clean_area)
117 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
118 add r0, r0, #DCACHELINESIZE
119 subs r1, r1, #DCACHELINESIZE
123 /* =============================== PageTable ============================== */
126 * cpu_sa110_switch_mm(pgd)
128 * Set the translation base pointer to be as described by pgd.
130 * pgd: new page tables
133 ENTRY(cpu_sa110_switch_mm)
136 bl v4wb_flush_kern_cache_all @ clears IP
137 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
138 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
145 * cpu_sa110_set_pte_ext(ptep, pte, ext)
147 * Set a PTE and flush it out
150 ENTRY(cpu_sa110_set_pte_ext)
152 armv3_set_pte_ext wc_disable=0
154 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
155 mcr p15, 0, r0, c7, c10, 4 @ drain WB
159 .type __sa110_setup, #function
162 mcr p15, 0, r10, c7, c7 @ invalidate I,D caches on v4
163 mcr p15, 0, r10, c7, c10, 4 @ drain write buffer on v4
165 mcr p15, 0, r10, c8, c7 @ invalidate I,D TLBs on v4
170 mrc p15, 0, r0, c1, c0 @ get control register v4
174 .size __sa110_setup, . - __sa110_setup
178 * .RVI ZFRS BLDP WCAM
179 * ..01 0001 ..11 1101
182 .type sa110_crval, #object
184 crval clear=0x00003f3f, mmuset=0x0000113d, ucset=0x00001130
188 @ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
189 define_processor_functions sa110, dabort=v4_early_abort, pabort=legacy_pabort
193 string cpu_arch_name, "armv4"
194 string cpu_elf_name, "v4"
195 string cpu_sa110_name, "StrongARM-110"
199 .section ".proc.info.init", "a"
201 .type __sa110_proc_info,#object
205 .long PMD_TYPE_SECT | \
206 PMD_SECT_BUFFERABLE | \
207 PMD_SECT_CACHEABLE | \
208 PMD_SECT_AP_WRITE | \
210 .long PMD_TYPE_SECT | \
211 PMD_SECT_AP_WRITE | \
213 initfn __sa110_setup, __sa110_proc_info
216 .long HWCAP_SWP | HWCAP_HALF | HWCAP_26BIT | HWCAP_FAST_MULT
218 .long sa110_processor_functions
222 .size __sa110_proc_info, . - __sa110_proc_info