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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * linux/arch/arm/mm/proc-sa1100.S
4 *
5 * Copyright (C) 1997-2002 Russell King
6 * hacked for non-paged-MM by Hyok S. Choi, 2003.
7 *
8 * MMU functions for SA110
9 *
10 * These are the low level assembler for performing cache and TLB
11 * functions on the StrongARM-1100 and StrongARM-1110.
12 *
13 * Note that SA1100 and SA1110 share everything but their name and CPU ID.
14 *
15 * 12-jun-2000, Erik Mouw (J.A.K.Mouw@its.tudelft.nl):
16 * Flush the read buffer at context switches
17 */
18#include <linux/linkage.h>
19#include <linux/init.h>
20#include <linux/cfi_types.h>
21#include <linux/pgtable.h>
22#include <asm/assembler.h>
23#include <asm/asm-offsets.h>
24#include <asm/hwcap.h>
25#include <mach/hardware.h>
26#include <asm/pgtable-hwdef.h>
27
28#include "proc-macros.S"
29
30/*
31 * the cache line size of the I and D cache
32 */
33#define DCACHELINESIZE 32
34
35 .section .text
36
37/*
38 * cpu_sa1100_proc_init()
39 */
40SYM_TYPED_FUNC_START(cpu_sa1100_proc_init)
41 mov r0, #0
42 mcr p15, 0, r0, c15, c1, 2 @ Enable clock switching
43 mcr p15, 0, r0, c9, c0, 5 @ Allow read-buffer operations from userland
44 ret lr
45SYM_FUNC_END(cpu_sa1100_proc_init)
46
47/*
48 * cpu_sa1100_proc_fin()
49 *
50 * Prepare the CPU for reset:
51 * - Disable interrupts
52 * - Clean and turn off caches.
53 */
54SYM_TYPED_FUNC_START(cpu_sa1100_proc_fin)
55 mcr p15, 0, ip, c15, c2, 2 @ Disable clock switching
56 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
57 bic r0, r0, #0x1000 @ ...i............
58 bic r0, r0, #0x000e @ ............wca.
59 mcr p15, 0, r0, c1, c0, 0 @ disable caches
60 ret lr
61SYM_FUNC_END(cpu_sa1100_proc_fin)
62
63/*
64 * cpu_sa1100_reset(loc)
65 *
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.
69 *
70 * loc: location to jump to for soft reset
71 */
72 .align 5
73 .pushsection .idmap.text, "ax"
74SYM_TYPED_FUNC_START(cpu_sa1100_reset)
75 mov ip, #0
76 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
77 mcr p15, 0, ip, c7, c10, 4 @ drain WB
78#ifdef CONFIG_MMU
79 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
80#endif
81 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
82 bic ip, ip, #0x000f @ ............wcam
83 bic ip, ip, #0x1100 @ ...i...s........
84 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
85 ret r0
86SYM_FUNC_END(cpu_sa1100_reset)
87 .popsection
88
89/*
90 * cpu_sa1100_do_idle(type)
91 *
92 * Cause the processor to idle
93 *
94 * type: call type:
95 * 0 = slow idle
96 * 1 = fast idle
97 * 2 = switch to slow processor clock
98 * 3 = switch to fast processor clock
99 */
100 .align 5
101SYM_TYPED_FUNC_START(cpu_sa1100_do_idle)
102 mov r0, r0 @ 4 nop padding
103 mov r0, r0
104 mov r0, r0
105 mov r0, r0 @ 4 nop padding
106 mov r0, r0
107 mov r0, r0
108 mov r0, #0
109 ldr r1, =UNCACHEABLE_ADDR @ ptr to uncacheable address
110 @ --- aligned to a cache line
111 mcr p15, 0, r0, c15, c2, 2 @ disable clock switching
112 ldr r1, [r1, #0] @ force switch to MCLK
113 mcr p15, 0, r0, c15, c8, 2 @ wait for interrupt
114 mov r0, r0 @ safety
115 mcr p15, 0, r0, c15, c1, 2 @ enable clock switching
116 ret lr
117SYM_FUNC_END(cpu_sa1100_do_idle)
118
119/* ================================= CACHE ================================ */
120
121/*
122 * cpu_sa1100_dcache_clean_area(addr,sz)
123 *
124 * Clean the specified entry of any caches such that the MMU
125 * translation fetches will obtain correct data.
126 *
127 * addr: cache-unaligned virtual address
128 */
129 .align 5
130SYM_TYPED_FUNC_START(cpu_sa1100_dcache_clean_area)
1311: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
132 add r0, r0, #DCACHELINESIZE
133 subs r1, r1, #DCACHELINESIZE
134 bhi 1b
135 ret lr
136SYM_FUNC_END(cpu_sa1100_dcache_clean_area)
137
138/* =============================== PageTable ============================== */
139
140/*
141 * cpu_sa1100_switch_mm(pgd)
142 *
143 * Set the translation base pointer to be as described by pgd.
144 *
145 * pgd: new page tables
146 */
147 .align 5
148SYM_TYPED_FUNC_START(cpu_sa1100_switch_mm)
149#ifdef CONFIG_MMU
150 str lr, [sp, #-4]!
151 bl v4wb_flush_kern_cache_all @ clears IP
152 mcr p15, 0, ip, c9, c0, 0 @ invalidate RB
153 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
154 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
155 ldr pc, [sp], #4
156#else
157 ret lr
158#endif
159SYM_FUNC_END(cpu_sa1100_switch_mm)
160
161/*
162 * cpu_sa1100_set_pte_ext(ptep, pte, ext)
163 *
164 * Set a PTE and flush it out
165 */
166 .align 5
167SYM_TYPED_FUNC_START(cpu_sa1100_set_pte_ext)
168#ifdef CONFIG_MMU
169 armv3_set_pte_ext wc_disable=0
170 mov r0, r0
171 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
172 mcr p15, 0, r0, c7, c10, 4 @ drain WB
173#endif
174 ret lr
175SYM_FUNC_END(cpu_sa1100_set_pte_ext)
176
177.globl cpu_sa1100_suspend_size
178.equ cpu_sa1100_suspend_size, 4 * 3
179#ifdef CONFIG_ARM_CPU_SUSPEND
180SYM_TYPED_FUNC_START(cpu_sa1100_do_suspend)
181 stmfd sp!, {r4 - r6, lr}
182 mrc p15, 0, r4, c3, c0, 0 @ domain ID
183 mrc p15, 0, r5, c13, c0, 0 @ PID
184 mrc p15, 0, r6, c1, c0, 0 @ control reg
185 stmia r0, {r4 - r6} @ store cp regs
186 ldmfd sp!, {r4 - r6, pc}
187SYM_FUNC_END(cpu_sa1100_do_suspend)
188
189SYM_TYPED_FUNC_START(cpu_sa1100_do_resume)
190 ldmia r0, {r4 - r6} @ load cp regs
191 mov ip, #0
192 mcr p15, 0, ip, c8, c7, 0 @ flush I+D TLBs
193 mcr p15, 0, ip, c7, c7, 0 @ flush I&D cache
194 mcr p15, 0, ip, c9, c0, 0 @ invalidate RB
195 mcr p15, 0, ip, c9, c0, 5 @ allow user space to use RB
196
197 mcr p15, 0, r4, c3, c0, 0 @ domain ID
198 mcr p15, 0, r1, c2, c0, 0 @ translation table base addr
199 mcr p15, 0, r5, c13, c0, 0 @ PID
200 mov r0, r6 @ control register
201 b cpu_resume_mmu
202SYM_FUNC_END(cpu_sa1100_do_resume)
203#endif
204
205 .type __sa1100_setup, #function
206__sa1100_setup:
207 mov r0, #0
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
210#ifdef CONFIG_MMU
211 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
212#endif
213 adr r5, sa1100_crval
214 ldmia r5, {r5, r6}
215 mrc p15, 0, r0, c1, c0 @ get control register v4
216 bic r0, r0, r5
217 orr r0, r0, r6
218 ret lr
219 .size __sa1100_setup, . - __sa1100_setup
220
221 /*
222 * R
223 * .RVI ZFRS BLDP WCAM
224 * ..11 0001 ..11 1101
225 *
226 */
227 .type sa1100_crval, #object
228sa1100_crval:
229 crval clear=0x00003f3f, mmuset=0x0000313d, ucset=0x00001130
230
231 __INITDATA
232
233/*
234 * SA1100 and SA1110 share the same function calls
235 */
236
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
239
240 .section ".rodata"
241
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"
246
247 .align
248
249 .section ".proc.info.init", "a"
250
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:
254 .long \cpu_val
255 .long \cpu_mask
256 .long PMD_TYPE_SECT | \
257 PMD_SECT_BUFFERABLE | \
258 PMD_SECT_CACHEABLE | \
259 PMD_SECT_AP_WRITE | \
260 PMD_SECT_AP_READ
261 .long PMD_TYPE_SECT | \
262 PMD_SECT_AP_WRITE | \
263 PMD_SECT_AP_READ
264 initfn __sa1100_setup, __\name\()_proc_info
265 .long cpu_arch_name
266 .long cpu_elf_name
267 .long HWCAP_SWP | HWCAP_HALF | HWCAP_26BIT | HWCAP_FAST_MULT
268 .long \cpu_name
269 .long sa1100_processor_functions
270 .long v4wb_tlb_fns
271 .long v4_mc_user_fns
272 .long v4wb_cache_fns
273 .size __\name\()_proc_info, . - __\name\()_proc_info
274.endm
275
276 sa1100_proc_info sa1100, 0x4401a110, 0xfffffff0, cpu_sa1100_name
277 sa1100_proc_info sa1110, 0x6901b110, 0xfffffff0, cpu_sa1110_name
1/*
2 * linux/arch/arm/mm/proc-sa1100.S
3 *
4 * Copyright (C) 1997-2002 Russell King
5 * hacked for non-paged-MM by Hyok S. Choi, 2003.
6 *
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.
10 *
11 * MMU functions for SA110
12 *
13 * These are the low level assembler for performing cache and TLB
14 * functions on the StrongARM-1100 and StrongARM-1110.
15 *
16 * Note that SA1100 and SA1110 share everything but their name and CPU ID.
17 *
18 * 12-jun-2000, Erik Mouw (J.A.K.Mouw@its.tudelft.nl):
19 * Flush the read buffer at context switches
20 */
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>
29
30#include "proc-macros.S"
31
32/*
33 * the cache line size of the I and D cache
34 */
35#define DCACHELINESIZE 32
36
37 .section .text
38
39/*
40 * cpu_sa1100_proc_init()
41 */
42ENTRY(cpu_sa1100_proc_init)
43 mov r0, #0
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
46 mov pc, lr
47
48/*
49 * cpu_sa1100_proc_fin()
50 *
51 * Prepare the CPU for reset:
52 * - Disable interrupts
53 * - Clean and turn off caches.
54 */
55ENTRY(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
61 mov pc, lr
62
63/*
64 * cpu_sa1100_reset(loc)
65 *
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.
69 *
70 * loc: location to jump to for soft reset
71 */
72 .align 5
73ENTRY(cpu_sa1100_reset)
74 mov ip, #0
75 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
76 mcr p15, 0, ip, c7, c10, 4 @ drain WB
77#ifdef CONFIG_MMU
78 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
79#endif
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
84 mov pc, r0
85
86/*
87 * cpu_sa1100_do_idle(type)
88 *
89 * Cause the processor to idle
90 *
91 * type: call type:
92 * 0 = slow idle
93 * 1 = fast idle
94 * 2 = switch to slow processor clock
95 * 3 = switch to fast processor clock
96 */
97 .align 5
98ENTRY(cpu_sa1100_do_idle)
99 mov r0, r0 @ 4 nop padding
100 mov r0, r0
101 mov r0, r0
102 mov r0, r0 @ 4 nop padding
103 mov r0, r0
104 mov r0, r0
105 mov r0, #0
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
111 mov r0, r0 @ safety
112 mcr p15, 0, r0, c15, c1, 2 @ enable clock switching
113 mov pc, lr
114
115/* ================================= CACHE ================================ */
116
117/*
118 * cpu_sa1100_dcache_clean_area(addr,sz)
119 *
120 * Clean the specified entry of any caches such that the MMU
121 * translation fetches will obtain correct data.
122 *
123 * addr: cache-unaligned virtual address
124 */
125 .align 5
126ENTRY(cpu_sa1100_dcache_clean_area)
1271: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
128 add r0, r0, #DCACHELINESIZE
129 subs r1, r1, #DCACHELINESIZE
130 bhi 1b
131 mov pc, lr
132
133/* =============================== PageTable ============================== */
134
135/*
136 * cpu_sa1100_switch_mm(pgd)
137 *
138 * Set the translation base pointer to be as described by pgd.
139 *
140 * pgd: new page tables
141 */
142 .align 5
143ENTRY(cpu_sa1100_switch_mm)
144#ifdef CONFIG_MMU
145 str lr, [sp, #-4]!
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
150 ldr pc, [sp], #4
151#else
152 mov pc, lr
153#endif
154
155/*
156 * cpu_sa1100_set_pte_ext(ptep, pte, ext)
157 *
158 * Set a PTE and flush it out
159 */
160 .align 5
161ENTRY(cpu_sa1100_set_pte_ext)
162#ifdef CONFIG_MMU
163 armv3_set_pte_ext wc_disable=0
164 mov r0, r0
165 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
166 mcr p15, 0, r0, c7, c10, 4 @ drain WB
167#endif
168 mov pc, lr
169
170.globl cpu_sa1100_suspend_size
171.equ cpu_sa1100_suspend_size, 4*4
172#ifdef CONFIG_PM_SLEEP
173ENTRY(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}
181ENDPROC(cpu_sa1100_do_suspend)
182
183ENTRY(cpu_sa1100_do_resume)
184 ldmia r0, {r4 - r7} @ load cp regs
185 mov ip, #0
186 mcr p15, 0, ip, c8, c7, 0 @ flush I+D TLBs
187 mcr p15, 0, ip, c7, c7, 0 @ flush I&D cache
188 mcr p15, 0, ip, c9, c0, 0 @ invalidate RB
189 mcr p15, 0, ip, c9, c0, 5 @ allow user space to use RB
190
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
196 mov r2, r2, lsl #14
197 ldr r3, =PMD_TYPE_SECT | PMD_SECT_BUFFERABLE | \
198 PMD_SECT_CACHEABLE | PMD_SECT_AP_WRITE
199 b cpu_resume_mmu
200ENDPROC(cpu_sa1100_do_resume)
201#endif
202
203 __CPUINIT
204
205 .type __sa1100_setup, #function
206__sa1100_setup:
207 mov r0, #0
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
210#ifdef CONFIG_MMU
211 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs on v4
212#endif
213 adr r5, sa1100_crval
214 ldmia r5, {r5, r6}
215 mrc p15, 0, r0, c1, c0 @ get control register v4
216 bic r0, r0, r5
217 orr r0, r0, r6
218 mov pc, lr
219 .size __sa1100_setup, . - __sa1100_setup
220
221 /*
222 * R
223 * .RVI ZFRS BLDP WCAM
224 * ..11 0001 ..11 1101
225 *
226 */
227 .type sa1100_crval, #object
228sa1100_crval:
229 crval clear=0x00003f3f, mmuset=0x0000313d, ucset=0x00001130
230
231 __INITDATA
232
233/*
234 * SA1100 and SA1110 share the same function calls
235 */
236
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
239
240 .section ".rodata"
241
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"
246
247 .align
248
249 .section ".proc.info.init", #alloc, #execinstr
250
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:
254 .long \cpu_val
255 .long \cpu_mask
256 .long PMD_TYPE_SECT | \
257 PMD_SECT_BUFFERABLE | \
258 PMD_SECT_CACHEABLE | \
259 PMD_SECT_AP_WRITE | \
260 PMD_SECT_AP_READ
261 .long PMD_TYPE_SECT | \
262 PMD_SECT_AP_WRITE | \
263 PMD_SECT_AP_READ
264 b __sa1100_setup
265 .long cpu_arch_name
266 .long cpu_elf_name
267 .long HWCAP_SWP | HWCAP_HALF | HWCAP_26BIT | HWCAP_FAST_MULT
268 .long \cpu_name
269 .long sa1100_processor_functions
270 .long v4wb_tlb_fns
271 .long v4_mc_user_fns
272 .long v4wb_cache_fns
273 .size __\name\()_proc_info, . - __\name\()_proc_info
274.endm
275
276 sa1100_proc_info sa1100, 0x4401a110, 0xfffffff0, cpu_sa1100_name
277 sa1100_proc_info sa1110, 0x6901b110, 0xfffffff0, cpu_sa1110_name