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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/mm/proc-v6.S | |
3 | * | |
4 | * Copyright (C) 2001 Deep Blue Solutions Ltd. | |
d090ddda | 5 | * Modified by Catalin Marinas for noMMU support |
1da177e4 LT |
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 | * This is the "shell" of the ARMv6 processor support. | |
12 | */ | |
991da17e | 13 | #include <linux/init.h> |
1da177e4 LT |
14 | #include <linux/linkage.h> |
15 | #include <asm/assembler.h> | |
e6ae744d | 16 | #include <asm/asm-offsets.h> |
5ec9407d | 17 | #include <asm/hwcap.h> |
74945c86 | 18 | #include <asm/pgtable-hwdef.h> |
1da177e4 LT |
19 | #include <asm/pgtable.h> |
20 | ||
21 | #include "proc-macros.S" | |
22 | ||
23 | #define D_CACHE_LINE_SIZE 32 | |
24 | ||
3747b36e RK |
25 | #define TTB_C (1 << 0) |
26 | #define TTB_S (1 << 1) | |
27 | #define TTB_IMP (1 << 2) | |
28 | #define TTB_RGN_NC (0 << 3) | |
29 | #define TTB_RGN_WBWA (1 << 3) | |
30 | #define TTB_RGN_WT (2 << 3) | |
31 | #define TTB_RGN_WB (3 << 3) | |
32 | ||
f2131d34 RK |
33 | #ifndef CONFIG_SMP |
34 | #define TTB_FLAGS TTB_RGN_WBWA | |
35 | #else | |
36 | #define TTB_FLAGS TTB_RGN_WBWA|TTB_S | |
37 | #endif | |
38 | ||
1da177e4 LT |
39 | ENTRY(cpu_v6_proc_init) |
40 | mov pc, lr | |
41 | ||
42 | ENTRY(cpu_v6_proc_fin) | |
67c5587a TL |
43 | stmfd sp!, {lr} |
44 | cpsid if @ disable interrupts | |
45 | bl v6_flush_kern_cache_all | |
46 | mrc p15, 0, r0, c1, c0, 0 @ ctrl register | |
47 | bic r0, r0, #0x1000 @ ...i............ | |
48 | bic r0, r0, #0x0006 @ .............ca. | |
49 | mcr p15, 0, r0, c1, c0, 0 @ disable caches | |
50 | ldmfd sp!, {pc} | |
1da177e4 LT |
51 | |
52 | /* | |
53 | * cpu_v6_reset(loc) | |
54 | * | |
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. | |
58 | * | |
59 | * - loc - location to jump to for soft reset | |
60 | * | |
61 | * It is assumed that: | |
62 | */ | |
63 | .align 5 | |
64 | ENTRY(cpu_v6_reset) | |
65 | mov pc, r0 | |
66 | ||
67 | /* | |
68 | * cpu_v6_do_idle() | |
69 | * | |
70 | * Idle the processor (eg, wait for interrupt). | |
71 | * | |
72 | * IRQs are already disabled. | |
73 | */ | |
74 | ENTRY(cpu_v6_do_idle) | |
8553cb67 CM |
75 | mov r1, #0 |
76 | mcr p15, 0, r1, c7, c10, 4 @ DWB - WFI may enter a low-power mode | |
1da177e4 LT |
77 | mcr p15, 0, r1, c7, c0, 4 @ wait for interrupt |
78 | mov pc, lr | |
79 | ||
80 | ENTRY(cpu_v6_dcache_clean_area) | |
81 | #ifndef TLB_CAN_READ_FROM_L1_CACHE | |
82 | 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry | |
83 | add r0, r0, #D_CACHE_LINE_SIZE | |
84 | subs r1, r1, #D_CACHE_LINE_SIZE | |
85 | bhi 1b | |
86 | #endif | |
87 | mov pc, lr | |
88 | ||
89 | /* | |
90 | * cpu_arm926_switch_mm(pgd_phys, tsk) | |
91 | * | |
92 | * Set the translation table base pointer to be pgd_phys | |
93 | * | |
94 | * - pgd_phys - physical address of new TTB | |
95 | * | |
96 | * It is assumed that: | |
97 | * - we are not using split page tables | |
98 | */ | |
99 | ENTRY(cpu_v6_switch_mm) | |
d090ddda | 100 | #ifdef CONFIG_MMU |
1da177e4 LT |
101 | mov r2, #0 |
102 | ldr r1, [r1, #MM_CONTEXT_ID] @ get mm->context.id | |
f2131d34 | 103 | orr r0, r0, #TTB_FLAGS |
d93742f5 | 104 | mcr p15, 0, r2, c7, c5, 6 @ flush BTAC/BTB |
1da177e4 LT |
105 | mcr p15, 0, r2, c7, c10, 4 @ drain write buffer |
106 | mcr p15, 0, r0, c2, c0, 0 @ set TTB 0 | |
107 | mcr p15, 0, r1, c13, c0, 1 @ set context ID | |
d090ddda | 108 | #endif |
1da177e4 LT |
109 | mov pc, lr |
110 | ||
1da177e4 | 111 | /* |
ad1ae2fe | 112 | * cpu_v6_set_pte_ext(ptep, pte, ext) |
1da177e4 LT |
113 | * |
114 | * Set a level 2 translation table entry. | |
115 | * | |
116 | * - ptep - pointer to level 2 translation table entry | |
117 | * (hardware version is stored at -1024 bytes) | |
118 | * - pte - PTE value to store | |
ad1ae2fe | 119 | * - ext - value for extended PTE bits |
1da177e4 | 120 | */ |
639b0ae7 RK |
121 | armv6_mt_table cpu_v6 |
122 | ||
ad1ae2fe | 123 | ENTRY(cpu_v6_set_pte_ext) |
d090ddda | 124 | #ifdef CONFIG_MMU |
639b0ae7 | 125 | armv6_set_pte_ext cpu_v6 |
d090ddda | 126 | #endif |
1da177e4 LT |
127 | mov pc, lr |
128 | ||
129 | ||
130 | ||
131 | ||
132 | cpu_v6_name: | |
94b1e96d | 133 | .asciz "ARMv6-compatible processor" |
1da177e4 LT |
134 | .align |
135 | ||
991da17e | 136 | __INIT |
1da177e4 LT |
137 | |
138 | /* | |
139 | * __v6_setup | |
140 | * | |
141 | * Initialise TLB, Caches, and MMU state ready to switch the MMU | |
142 | * on. Return in r0 the new CP15 C1 control register setting. | |
143 | * | |
144 | * We automatically detect if we have a Harvard cache, and use the | |
145 | * Harvard cache control instructions insead of the unified cache | |
146 | * control instructions. | |
147 | * | |
148 | * This should be able to cover all ARMv6 cores. | |
149 | * | |
150 | * It is assumed that: | |
151 | * - cache type register is implemented | |
152 | */ | |
153 | __v6_setup: | |
862184fe | 154 | #ifdef CONFIG_SMP |
862184fe RK |
155 | mrc p15, 0, r0, c1, c0, 1 @ Enable SMP/nAMP mode |
156 | orr r0, r0, #0x20 | |
157 | mcr p15, 0, r0, c1, c0, 1 | |
862184fe RK |
158 | #endif |
159 | ||
1da177e4 LT |
160 | mov r0, #0 |
161 | mcr p15, 0, r0, c7, c14, 0 @ clean+invalidate D cache | |
162 | mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache | |
163 | mcr p15, 0, r0, c7, c15, 0 @ clean+invalidate cache | |
164 | mcr p15, 0, r0, c7, c10, 4 @ drain write buffer | |
d090ddda | 165 | #ifdef CONFIG_MMU |
1da177e4 LT |
166 | mcr p15, 0, r0, c8, c7, 0 @ invalidate I + D TLBs |
167 | mcr p15, 0, r0, c2, c0, 2 @ TTB control register | |
f2131d34 | 168 | orr r4, r4, #TTB_FLAGS |
1da177e4 | 169 | mcr p15, 0, r4, c2, c0, 1 @ load TTB1 |
d090ddda | 170 | #endif /* CONFIG_MMU */ |
22b19086 RK |
171 | adr r5, v6_crval |
172 | ldmia r5, {r5, r6} | |
1da177e4 | 173 | mrc p15, 0, r0, c1, c0, 0 @ read control register |
1da177e4 | 174 | bic r0, r0, r5 @ clear bits them |
22b19086 | 175 | orr r0, r0, r6 @ set them |
1da177e4 LT |
176 | mov pc, lr @ return to head.S:__ret |
177 | ||
178 | /* | |
179 | * V X F I D LR | |
180 | * .... ...E PUI. .T.T 4RVI ZFRS BLDP WCAM | |
181 | * rrrr rrrx xxx0 0101 xxxx xxxx x111 xxxx < forced | |
182 | * 0 110 0011 1.00 .111 1101 < we want | |
183 | */ | |
22b19086 RK |
184 | .type v6_crval, #object |
185 | v6_crval: | |
186 | crval clear=0x01e0fb7f, mmuset=0x00c0387d, ucset=0x00c0187c | |
1da177e4 LT |
187 | |
188 | .type v6_processor_functions, #object | |
189 | ENTRY(v6_processor_functions) | |
190 | .word v6_early_abort | |
4a1fd556 | 191 | .word pabort_noifar |
1da177e4 LT |
192 | .word cpu_v6_proc_init |
193 | .word cpu_v6_proc_fin | |
194 | .word cpu_v6_reset | |
195 | .word cpu_v6_do_idle | |
196 | .word cpu_v6_dcache_clean_area | |
197 | .word cpu_v6_switch_mm | |
ad1ae2fe | 198 | .word cpu_v6_set_pte_ext |
1da177e4 LT |
199 | .size v6_processor_functions, . - v6_processor_functions |
200 | ||
201 | .type cpu_arch_name, #object | |
202 | cpu_arch_name: | |
203 | .asciz "armv6" | |
204 | .size cpu_arch_name, . - cpu_arch_name | |
205 | ||
206 | .type cpu_elf_name, #object | |
207 | cpu_elf_name: | |
208 | .asciz "v6" | |
209 | .size cpu_elf_name, . - cpu_elf_name | |
210 | .align | |
211 | ||
02b7dd12 | 212 | .section ".proc.info.init", #alloc, #execinstr |
1da177e4 LT |
213 | |
214 | /* | |
215 | * Match any ARMv6 processor core. | |
216 | */ | |
217 | .type __v6_proc_info, #object | |
218 | __v6_proc_info: | |
219 | .long 0x0007b000 | |
220 | .long 0x0007f000 | |
221 | .long PMD_TYPE_SECT | \ | |
222 | PMD_SECT_BUFFERABLE | \ | |
223 | PMD_SECT_CACHEABLE | \ | |
224 | PMD_SECT_AP_WRITE | \ | |
225 | PMD_SECT_AP_READ | |
8799ee9f RK |
226 | .long PMD_TYPE_SECT | \ |
227 | PMD_SECT_XN | \ | |
228 | PMD_SECT_AP_WRITE | \ | |
229 | PMD_SECT_AP_READ | |
1da177e4 LT |
230 | b __v6_setup |
231 | .long cpu_arch_name | |
232 | .long cpu_elf_name | |
efe90d27 | 233 | .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP|HWCAP_JAVA |
1da177e4 LT |
234 | .long cpu_v6_name |
235 | .long v6_processor_functions | |
236 | .long v6wbi_tlb_fns | |
237 | .long v6_user_fns | |
238 | .long v6_cache_fns | |
239 | .size __v6_proc_info, . - __v6_proc_info |