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d60674eb HC |
1 | /* |
2 | * linux/arch/arm/mm/arm940.S: utility functions for ARM940T | |
3 | * | |
4 | * Copyright (C) 2004-2006 Hyok S. Choi (hyok.choi@samsung.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | */ | |
11 | #include <linux/linkage.h> | |
12 | #include <linux/init.h> | |
13 | #include <asm/assembler.h> | |
5ec9407d | 14 | #include <asm/hwcap.h> |
d60674eb HC |
15 | #include <asm/pgtable-hwdef.h> |
16 | #include <asm/pgtable.h> | |
d60674eb | 17 | #include <asm/ptrace.h> |
8a5544c8 | 18 | #include "proc-macros.S" |
d60674eb HC |
19 | |
20 | /* ARM940T has a 4KB DCache comprising 256 lines of 4 words */ | |
21 | #define CACHE_DLINESIZE 16 | |
22 | #define CACHE_DSEGMENTS 4 | |
23 | #define CACHE_DENTRIES 64 | |
24 | ||
25 | .text | |
26 | /* | |
27 | * cpu_arm940_proc_init() | |
28 | * cpu_arm940_switch_mm() | |
29 | * | |
30 | * These are not required. | |
31 | */ | |
32 | ENTRY(cpu_arm940_proc_init) | |
33 | ENTRY(cpu_arm940_switch_mm) | |
34 | mov pc, lr | |
35 | ||
36 | /* | |
37 | * cpu_arm940_proc_fin() | |
38 | */ | |
39 | ENTRY(cpu_arm940_proc_fin) | |
d60674eb HC |
40 | mrc p15, 0, r0, c1, c0, 0 @ ctrl register |
41 | bic r0, r0, #0x00001000 @ i-cache | |
42 | bic r0, r0, #0x00000004 @ d-cache | |
43 | mcr p15, 0, r0, c1, c0, 0 @ disable caches | |
9ca03a21 | 44 | mov pc, lr |
d60674eb HC |
45 | |
46 | /* | |
47 | * cpu_arm940_reset(loc) | |
48 | * Params : r0 = address to jump to | |
49 | * Notes : This sets up everything for a reset | |
50 | */ | |
1a4baafa | 51 | .pushsection .idmap.text, "ax" |
d60674eb HC |
52 | ENTRY(cpu_arm940_reset) |
53 | mov ip, #0 | |
54 | mcr p15, 0, ip, c7, c5, 0 @ flush I cache | |
55 | mcr p15, 0, ip, c7, c6, 0 @ flush D cache | |
56 | mcr p15, 0, ip, c7, c10, 4 @ drain WB | |
57 | mrc p15, 0, ip, c1, c0, 0 @ ctrl register | |
58 | bic ip, ip, #0x00000005 @ .............c.p | |
59 | bic ip, ip, #0x00001000 @ i-cache | |
60 | mcr p15, 0, ip, c1, c0, 0 @ ctrl register | |
61 | mov pc, r0 | |
1a4baafa WD |
62 | ENDPROC(cpu_arm940_reset) |
63 | .popsection | |
d60674eb HC |
64 | |
65 | /* | |
66 | * cpu_arm940_do_idle() | |
67 | */ | |
68 | .align 5 | |
69 | ENTRY(cpu_arm940_do_idle) | |
70 | mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt | |
71 | mov pc, lr | |
72 | ||
c8c90860 MW |
73 | /* |
74 | * flush_icache_all() | |
75 | * | |
76 | * Unconditionally clean and invalidate the entire icache. | |
77 | */ | |
78 | ENTRY(arm940_flush_icache_all) | |
79 | mov r0, #0 | |
80 | mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache | |
81 | mov pc, lr | |
82 | ENDPROC(arm940_flush_icache_all) | |
83 | ||
d60674eb HC |
84 | /* |
85 | * flush_user_cache_all() | |
86 | */ | |
87 | ENTRY(arm940_flush_user_cache_all) | |
88 | /* FALLTHROUGH */ | |
89 | ||
90 | /* | |
91 | * flush_kern_cache_all() | |
92 | * | |
93 | * Clean and invalidate the entire cache. | |
94 | */ | |
95 | ENTRY(arm940_flush_kern_cache_all) | |
96 | mov r2, #VM_EXEC | |
97 | /* FALLTHROUGH */ | |
98 | ||
99 | /* | |
100 | * flush_user_cache_range(start, end, flags) | |
101 | * | |
102 | * There is no efficient way to flush a range of cache entries | |
103 | * in the specified address range. Thus, flushes all. | |
104 | * | |
105 | * - start - start address (inclusive) | |
106 | * - end - end address (exclusive) | |
107 | * - flags - vm_flags describing address space | |
108 | */ | |
109 | ENTRY(arm940_flush_user_cache_range) | |
110 | mov ip, #0 | |
111 | #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH | |
112 | mcr p15, 0, ip, c7, c6, 0 @ flush D cache | |
113 | #else | |
114 | mov r1, #(CACHE_DSEGMENTS - 1) << 4 @ 4 segments | |
115 | 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries | |
116 | 2: mcr p15, 0, r3, c7, c14, 2 @ clean/flush D index | |
117 | subs r3, r3, #1 << 26 | |
118 | bcs 2b @ entries 63 to 0 | |
119 | subs r1, r1, #1 << 4 | |
120 | bcs 1b @ segments 3 to 0 | |
121 | #endif | |
122 | tst r2, #VM_EXEC | |
123 | mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache | |
124 | mcrne p15, 0, ip, c7, c10, 4 @ drain WB | |
125 | mov pc, lr | |
126 | ||
127 | /* | |
128 | * coherent_kern_range(start, end) | |
129 | * | |
130 | * Ensure coherency between the Icache and the Dcache in the | |
131 | * region described by start, end. If you have non-snooping | |
132 | * Harvard caches, you need to implement this function. | |
133 | * | |
134 | * - start - virtual start address | |
135 | * - end - virtual end address | |
136 | */ | |
137 | ENTRY(arm940_coherent_kern_range) | |
138 | /* FALLTHROUGH */ | |
139 | ||
140 | /* | |
141 | * coherent_user_range(start, end) | |
142 | * | |
143 | * Ensure coherency between the Icache and the Dcache in the | |
144 | * region described by start, end. If you have non-snooping | |
145 | * Harvard caches, you need to implement this function. | |
146 | * | |
147 | * - start - virtual start address | |
148 | * - end - virtual end address | |
149 | */ | |
150 | ENTRY(arm940_coherent_user_range) | |
151 | /* FALLTHROUGH */ | |
152 | ||
153 | /* | |
2c9b9c84 | 154 | * flush_kern_dcache_area(void *addr, size_t size) |
d60674eb HC |
155 | * |
156 | * Ensure no D cache aliasing occurs, either with itself or | |
157 | * the I cache | |
158 | * | |
2c9b9c84 RK |
159 | * - addr - kernel address |
160 | * - size - region size | |
d60674eb | 161 | */ |
2c9b9c84 | 162 | ENTRY(arm940_flush_kern_dcache_area) |
c5102f59 | 163 | mov r0, #0 |
d60674eb HC |
164 | mov r1, #(CACHE_DSEGMENTS - 1) << 4 @ 4 segments |
165 | 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries | |
166 | 2: mcr p15, 0, r3, c7, c14, 2 @ clean/flush D index | |
167 | subs r3, r3, #1 << 26 | |
168 | bcs 2b @ entries 63 to 0 | |
169 | subs r1, r1, #1 << 4 | |
170 | bcs 1b @ segments 7 to 0 | |
c5102f59 WD |
171 | mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache |
172 | mcr p15, 0, r0, c7, c10, 4 @ drain WB | |
d60674eb HC |
173 | mov pc, lr |
174 | ||
175 | /* | |
176 | * dma_inv_range(start, end) | |
177 | * | |
178 | * There is no efficient way to invalidate a specifid virtual | |
179 | * address range. Thus, invalidates all. | |
180 | * | |
181 | * - start - virtual start address | |
182 | * - end - virtual end address | |
183 | */ | |
702b94bf | 184 | arm940_dma_inv_range: |
d60674eb HC |
185 | mov ip, #0 |
186 | mov r1, #(CACHE_DSEGMENTS - 1) << 4 @ 4 segments | |
187 | 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries | |
188 | 2: mcr p15, 0, r3, c7, c6, 2 @ flush D entry | |
189 | subs r3, r3, #1 << 26 | |
190 | bcs 2b @ entries 63 to 0 | |
191 | subs r1, r1, #1 << 4 | |
192 | bcs 1b @ segments 7 to 0 | |
193 | mcr p15, 0, ip, c7, c10, 4 @ drain WB | |
194 | mov pc, lr | |
195 | ||
196 | /* | |
197 | * dma_clean_range(start, end) | |
198 | * | |
199 | * There is no efficient way to clean a specifid virtual | |
200 | * address range. Thus, cleans all. | |
201 | * | |
202 | * - start - virtual start address | |
203 | * - end - virtual end address | |
204 | */ | |
702b94bf | 205 | arm940_dma_clean_range: |
d60674eb HC |
206 | ENTRY(cpu_arm940_dcache_clean_area) |
207 | mov ip, #0 | |
208 | #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH | |
209 | mov r1, #(CACHE_DSEGMENTS - 1) << 4 @ 4 segments | |
210 | 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries | |
211 | 2: mcr p15, 0, r3, c7, c10, 2 @ clean D entry | |
212 | subs r3, r3, #1 << 26 | |
213 | bcs 2b @ entries 63 to 0 | |
214 | subs r1, r1, #1 << 4 | |
215 | bcs 1b @ segments 7 to 0 | |
216 | #endif | |
217 | mcr p15, 0, ip, c7, c10, 4 @ drain WB | |
218 | mov pc, lr | |
219 | ||
220 | /* | |
221 | * dma_flush_range(start, end) | |
222 | * | |
223 | * There is no efficient way to clean and invalidate a specifid | |
224 | * virtual address range. | |
225 | * | |
226 | * - start - virtual start address | |
227 | * - end - virtual end address | |
228 | */ | |
229 | ENTRY(arm940_dma_flush_range) | |
230 | mov ip, #0 | |
231 | mov r1, #(CACHE_DSEGMENTS - 1) << 4 @ 4 segments | |
232 | 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries | |
233 | 2: | |
234 | #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH | |
235 | mcr p15, 0, r3, c7, c14, 2 @ clean/flush D entry | |
236 | #else | |
b3a8b751 | 237 | mcr p15, 0, r3, c7, c6, 2 @ invalidate D entry |
d60674eb HC |
238 | #endif |
239 | subs r3, r3, #1 << 26 | |
240 | bcs 2b @ entries 63 to 0 | |
241 | subs r1, r1, #1 << 4 | |
242 | bcs 1b @ segments 7 to 0 | |
243 | mcr p15, 0, ip, c7, c10, 4 @ drain WB | |
244 | mov pc, lr | |
245 | ||
a9c9147e RK |
246 | /* |
247 | * dma_map_area(start, size, dir) | |
248 | * - start - kernel virtual start address | |
249 | * - size - size of region | |
250 | * - dir - DMA direction | |
251 | */ | |
252 | ENTRY(arm940_dma_map_area) | |
253 | add r1, r1, r0 | |
254 | cmp r2, #DMA_TO_DEVICE | |
255 | beq arm940_dma_clean_range | |
256 | bcs arm940_dma_inv_range | |
257 | b arm940_dma_flush_range | |
258 | ENDPROC(arm940_dma_map_area) | |
259 | ||
260 | /* | |
261 | * dma_unmap_area(start, size, dir) | |
262 | * - start - kernel virtual start address | |
263 | * - size - size of region | |
264 | * - dir - DMA direction | |
265 | */ | |
266 | ENTRY(arm940_dma_unmap_area) | |
267 | mov pc, lr | |
268 | ENDPROC(arm940_dma_unmap_area) | |
269 | ||
031bd879 LP |
270 | .globl arm940_flush_kern_cache_louis |
271 | .equ arm940_flush_kern_cache_louis, arm940_flush_kern_cache_all | |
272 | ||
b3755801 DM |
273 | @ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S) |
274 | define_cache_functions arm940 | |
d60674eb | 275 | |
5085f3ff | 276 | __CPUINIT |
d60674eb HC |
277 | |
278 | .type __arm940_setup, #function | |
279 | __arm940_setup: | |
280 | mov r0, #0 | |
281 | mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache | |
282 | mcr p15, 0, r0, c7, c6, 0 @ invalidate D cache | |
283 | mcr p15, 0, r0, c7, c10, 4 @ drain WB | |
284 | ||
285 | mcr p15, 0, r0, c6, c3, 0 @ disable data area 3~7 | |
286 | mcr p15, 0, r0, c6, c4, 0 | |
287 | mcr p15, 0, r0, c6, c5, 0 | |
288 | mcr p15, 0, r0, c6, c6, 0 | |
289 | mcr p15, 0, r0, c6, c7, 0 | |
290 | ||
291 | mcr p15, 0, r0, c6, c3, 1 @ disable instruction area 3~7 | |
292 | mcr p15, 0, r0, c6, c4, 1 | |
293 | mcr p15, 0, r0, c6, c5, 1 | |
294 | mcr p15, 0, r0, c6, c6, 1 | |
295 | mcr p15, 0, r0, c6, c7, 1 | |
296 | ||
297 | mov r0, #0x0000003F @ base = 0, size = 4GB | |
298 | mcr p15, 0, r0, c6, c0, 0 @ set area 0, default | |
299 | mcr p15, 0, r0, c6, c0, 1 | |
300 | ||
301 | ldr r0, =(CONFIG_DRAM_BASE & 0xFFFFF000) @ base[31:12] of RAM | |
302 | ldr r1, =(CONFIG_DRAM_SIZE >> 12) @ size of RAM (must be >= 4KB) | |
303 | mov r2, #10 @ 11 is the minimum (4KB) | |
304 | 1: add r2, r2, #1 @ area size *= 2 | |
305 | mov r1, r1, lsr #1 | |
306 | bne 1b @ count not zero r-shift | |
307 | orr r0, r0, r2, lsl #1 @ the area register value | |
308 | orr r0, r0, #1 @ set enable bit | |
309 | mcr p15, 0, r0, c6, c1, 0 @ set area 1, RAM | |
310 | mcr p15, 0, r0, c6, c1, 1 | |
311 | ||
312 | ldr r0, =(CONFIG_FLASH_MEM_BASE & 0xFFFFF000) @ base[31:12] of FLASH | |
313 | ldr r1, =(CONFIG_FLASH_SIZE >> 12) @ size of FLASH (must be >= 4KB) | |
314 | mov r2, #10 @ 11 is the minimum (4KB) | |
315 | 1: add r2, r2, #1 @ area size *= 2 | |
316 | mov r1, r1, lsr #1 | |
317 | bne 1b @ count not zero r-shift | |
318 | orr r0, r0, r2, lsl #1 @ the area register value | |
319 | orr r0, r0, #1 @ set enable bit | |
320 | mcr p15, 0, r0, c6, c2, 0 @ set area 2, ROM/FLASH | |
321 | mcr p15, 0, r0, c6, c2, 1 | |
322 | ||
323 | mov r0, #0x06 | |
324 | mcr p15, 0, r0, c2, c0, 0 @ Region 1&2 cacheable | |
325 | mcr p15, 0, r0, c2, c0, 1 | |
326 | #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH | |
327 | mov r0, #0x00 @ disable whole write buffer | |
328 | #else | |
329 | mov r0, #0x02 @ Region 1 write bufferred | |
330 | #endif | |
331 | mcr p15, 0, r0, c3, c0, 0 | |
332 | ||
333 | mov r0, #0x10000 | |
334 | sub r0, r0, #1 @ r0 = 0xffff | |
335 | mcr p15, 0, r0, c5, c0, 0 @ all read/write access | |
336 | mcr p15, 0, r0, c5, c0, 1 | |
337 | ||
338 | mrc p15, 0, r0, c1, c0 @ get control register | |
339 | orr r0, r0, #0x00001000 @ I-cache | |
340 | orr r0, r0, #0x00000005 @ MPU/D-cache | |
341 | ||
342 | mov pc, lr | |
343 | ||
344 | .size __arm940_setup, . - __arm940_setup | |
345 | ||
346 | __INITDATA | |
347 | ||
b3755801 DM |
348 | @ define struct processor (see <asm/proc-fns.h> and proc-macros.S) |
349 | define_processor_functions arm940, dabort=nommu_early_abort, pabort=legacy_pabort, nommu=1 | |
d60674eb HC |
350 | |
351 | .section ".rodata" | |
352 | ||
b3755801 DM |
353 | string cpu_arch_name, "armv4t" |
354 | string cpu_elf_name, "v4" | |
355 | string cpu_arm940_name, "ARM940T" | |
d60674eb HC |
356 | |
357 | .align | |
358 | ||
359 | .section ".proc.info.init", #alloc, #execinstr | |
360 | ||
361 | .type __arm940_proc_info,#object | |
362 | __arm940_proc_info: | |
363 | .long 0x41009400 | |
364 | .long 0xff00fff0 | |
365 | .long 0 | |
366 | b __arm940_setup | |
367 | .long cpu_arch_name | |
368 | .long cpu_elf_name | |
369 | .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB | |
370 | .long cpu_arm940_name | |
371 | .long arm940_processor_functions | |
372 | .long 0 | |
373 | .long 0 | |
374 | .long arm940_cache_fns | |
375 | .size __arm940_proc_info, . - __arm940_proc_info | |
376 |