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1/*
2 * linux/arch/arm/mm/arm946.S: utility functions for ARM946E-S
3 *
4 * Copyright (C) 2004-2006 Hyok S. Choi (hyok.choi@samsung.com)
5 *
6 * (Many of cache codes are from proc-arm926.S)
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 */
13#include <linux/linkage.h>
14#include <linux/init.h>
15#include <asm/assembler.h>
16#include <asm/pgtable-hwdef.h>
17#include <asm/pgtable.h>
18#include <asm/procinfo.h>
19#include <asm/ptrace.h>
20
21/*
22 * ARM946E-S is synthesizable to have 0KB to 1MB sized D-Cache,
23 * comprising 256 lines of 32 bytes (8 words).
24 */
25#define CACHE_DSIZE (CONFIG_CPU_DCACHE_SIZE) /* typically 8KB. */
26#define CACHE_DLINESIZE 32 /* fixed */
27#define CACHE_DSEGMENTS 4 /* fixed */
28#define CACHE_DENTRIES (CACHE_DSIZE / CACHE_DSEGMENTS / CACHE_DLINESIZE)
29#define CACHE_DLIMIT (CACHE_DSIZE * 4) /* benchmark needed */
30
31 .text
32/*
33 * cpu_arm946_proc_init()
34 * cpu_arm946_switch_mm()
35 *
36 * These are not required.
37 */
38ENTRY(cpu_arm946_proc_init)
39ENTRY(cpu_arm946_switch_mm)
40 mov pc, lr
41
42/*
43 * cpu_arm946_proc_fin()
44 */
45ENTRY(cpu_arm946_proc_fin)
46 stmfd sp!, {lr}
47 mov ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
48 msr cpsr_c, ip
49 bl arm946_flush_kern_cache_all
50 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
51 bic r0, r0, #0x00001000 @ i-cache
52 bic r0, r0, #0x00000004 @ d-cache
53 mcr p15, 0, r0, c1, c0, 0 @ disable caches
54 ldmfd sp!, {pc}
55
56/*
57 * cpu_arm946_reset(loc)
58 * Params : r0 = address to jump to
59 * Notes : This sets up everything for a reset
60 */
61ENTRY(cpu_arm946_reset)
62 mov ip, #0
63 mcr p15, 0, ip, c7, c5, 0 @ flush I cache
64 mcr p15, 0, ip, c7, c6, 0 @ flush D cache
65 mcr p15, 0, ip, c7, c10, 4 @ drain WB
66 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
67 bic ip, ip, #0x00000005 @ .............c.p
68 bic ip, ip, #0x00001000 @ i-cache
69 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
70 mov pc, r0
71
72/*
73 * cpu_arm946_do_idle()
74 */
75 .align 5
76ENTRY(cpu_arm946_do_idle)
77 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
78 mov pc, lr
79
80/*
81 * flush_user_cache_all()
82 */
83ENTRY(arm946_flush_user_cache_all)
84 /* FALLTHROUGH */
85
86/*
87 * flush_kern_cache_all()
88 *
89 * Clean and invalidate the entire cache.
90 */
91ENTRY(arm946_flush_kern_cache_all)
92 mov r2, #VM_EXEC
93 mov ip, #0
94__flush_whole_cache:
95#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
96 mcr p15, 0, ip, c7, c6, 0 @ flush D cache
97#else
98 mov r1, #(CACHE_DSEGMENTS - 1) << 29 @ 4 segments
991: orr r3, r1, #(CACHE_DENTRIES - 1) << 4 @ n entries
1002: mcr p15, 0, r3, c7, c14, 2 @ clean/flush D index
101 subs r3, r3, #1 << 4
102 bcs 2b @ entries n to 0
103 subs r1, r1, #1 << 29
104 bcs 1b @ segments 3 to 0
105#endif
106 tst r2, #VM_EXEC
107 mcrne p15, 0, ip, c7, c5, 0 @ flush I cache
108 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
109 mov pc, lr
110
111/*
112 * flush_user_cache_range(start, end, flags)
113 *
114 * Clean and invalidate a range of cache entries in the
115 * specified address range.
116 *
117 * - start - start address (inclusive)
118 * - end - end address (exclusive)
119 * - flags - vm_flags describing address space
120 * (same as arm926)
121 */
122ENTRY(arm946_flush_user_cache_range)
123 mov ip, #0
124 sub r3, r1, r0 @ calculate total size
125 cmp r3, #CACHE_DLIMIT
126 bhs __flush_whole_cache
127
1281: tst r2, #VM_EXEC
129#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
130 mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
131 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
132 add r0, r0, #CACHE_DLINESIZE
133 mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
134 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
135 add r0, r0, #CACHE_DLINESIZE
136#else
137 mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D entry
138 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
139 add r0, r0, #CACHE_DLINESIZE
140 mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D entry
141 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
142 add r0, r0, #CACHE_DLINESIZE
143#endif
144 cmp r0, r1
145 blo 1b
146 tst r2, #VM_EXEC
147 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
148 mov pc, lr
149
150/*
151 * coherent_kern_range(start, end)
152 *
153 * Ensure coherency between the Icache and the Dcache in the
154 * region described by start, end. If you have non-snooping
155 * Harvard caches, you need to implement this function.
156 *
157 * - start - virtual start address
158 * - end - virtual end address
159 */
160ENTRY(arm946_coherent_kern_range)
161 /* FALLTHROUGH */
162
163/*
164 * coherent_user_range(start, end)
165 *
166 * Ensure coherency between the Icache and the Dcache in the
167 * region described by start, end. If you have non-snooping
168 * Harvard caches, you need to implement this function.
169 *
170 * - start - virtual start address
171 * - end - virtual end address
172 * (same as arm926)
173 */
174ENTRY(arm946_coherent_user_range)
175 bic r0, r0, #CACHE_DLINESIZE - 1
1761: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
177 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
178 add r0, r0, #CACHE_DLINESIZE
179 cmp r0, r1
180 blo 1b
181 mcr p15, 0, r0, c7, c10, 4 @ drain WB
182 mov pc, lr
183
184/*
185 * flush_kern_dcache_page(void *page)
186 *
187 * Ensure no D cache aliasing occurs, either with itself or
188 * the I cache
189 *
190 * - addr - page aligned address
191 * (same as arm926)
192 */
193ENTRY(arm946_flush_kern_dcache_page)
194 add r1, r0, #PAGE_SZ
1951: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
196 add r0, r0, #CACHE_DLINESIZE
197 cmp r0, r1
198 blo 1b
199 mov r0, #0
200 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
201 mcr p15, 0, r0, c7, c10, 4 @ drain WB
202 mov pc, lr
203
204/*
205 * dma_inv_range(start, end)
206 *
207 * Invalidate (discard) the specified virtual address range.
208 * May not write back any entries. If 'start' or 'end'
209 * are not cache line aligned, those lines must be written
210 * back.
211 *
212 * - start - virtual start address
213 * - end - virtual end address
214 * (same as arm926)
215 */
216ENTRY(arm946_dma_inv_range)
217#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
218 tst r0, #CACHE_DLINESIZE - 1
219 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
220 tst r1, #CACHE_DLINESIZE - 1
221 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
222#endif
223 bic r0, r0, #CACHE_DLINESIZE - 1
2241: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
225 add r0, r0, #CACHE_DLINESIZE
226 cmp r0, r1
227 blo 1b
228 mcr p15, 0, r0, c7, c10, 4 @ drain WB
229 mov pc, lr
230
231/*
232 * dma_clean_range(start, end)
233 *
234 * Clean the specified virtual address range.
235 *
236 * - start - virtual start address
237 * - end - virtual end address
238 *
239 * (same as arm926)
240 */
241ENTRY(arm946_dma_clean_range)
242#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
243 bic r0, r0, #CACHE_DLINESIZE - 1
2441: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
245 add r0, r0, #CACHE_DLINESIZE
246 cmp r0, r1
247 blo 1b
248#endif
249 mcr p15, 0, r0, c7, c10, 4 @ drain WB
250 mov pc, lr
251
252/*
253 * dma_flush_range(start, end)
254 *
255 * Clean and invalidate the specified virtual address range.
256 *
257 * - start - virtual start address
258 * - end - virtual end address
259 *
260 * (same as arm926)
261 */
262ENTRY(arm946_dma_flush_range)
263 bic r0, r0, #CACHE_DLINESIZE - 1
2641:
265#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
266 mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
267#else
268 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
269#endif
270 add r0, r0, #CACHE_DLINESIZE
271 cmp r0, r1
272 blo 1b
273 mcr p15, 0, r0, c7, c10, 4 @ drain WB
274 mov pc, lr
275
276ENTRY(arm946_cache_fns)
277 .long arm946_flush_kern_cache_all
278 .long arm946_flush_user_cache_all
279 .long arm946_flush_user_cache_range
280 .long arm946_coherent_kern_range
281 .long arm946_coherent_user_range
282 .long arm946_flush_kern_dcache_page
283 .long arm946_dma_inv_range
284 .long arm946_dma_clean_range
285 .long arm946_dma_flush_range
286
287
288ENTRY(cpu_arm946_dcache_clean_area)
289#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
2901: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
291 add r0, r0, #CACHE_DLINESIZE
292 subs r1, r1, #CACHE_DLINESIZE
293 bhi 1b
294#endif
295 mcr p15, 0, r0, c7, c10, 4 @ drain WB
296 mov pc, lr
297
298 __INIT
299
300 .type __arm946_setup, #function
301__arm946_setup:
302 mov r0, #0
303 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
304 mcr p15, 0, r0, c7, c6, 0 @ invalidate D cache
305 mcr p15, 0, r0, c7, c10, 4 @ drain WB
306
307 mcr p15, 0, r0, c6, c3, 0 @ disable memory region 3~7
308 mcr p15, 0, r0, c6, c4, 0
309 mcr p15, 0, r0, c6, c5, 0
310 mcr p15, 0, r0, c6, c6, 0
311 mcr p15, 0, r0, c6, c7, 0
312
313 mov r0, #0x0000003F @ base = 0, size = 4GB
314 mcr p15, 0, r0, c6, c0, 0 @ set region 0, default
315
316 ldr r0, =(CONFIG_DRAM_BASE & 0xFFFFF000) @ base[31:12] of RAM
317 ldr r1, =(CONFIG_DRAM_SIZE >> 12) @ size of RAM (must be >= 4KB)
318 mov r2, #10 @ 11 is the minimum (4KB)
3191: add r2, r2, #1 @ area size *= 2
320 mov r1, r1, lsr #1
321 bne 1b @ count not zero r-shift
322 orr r0, r0, r2, lsl #1 @ the region register value
323 orr r0, r0, #1 @ set enable bit
324 mcr p15, 0, r0, c6, c1, 0 @ set region 1, RAM
325
326 ldr r0, =(CONFIG_FLASH_MEM_BASE & 0xFFFFF000) @ base[31:12] of FLASH
327 ldr r1, =(CONFIG_FLASH_SIZE >> 12) @ size of FLASH (must be >= 4KB)
328 mov r2, #10 @ 11 is the minimum (4KB)
3291: add r2, r2, #1 @ area size *= 2
330 mov r1, r1, lsr #1
331 bne 1b @ count not zero r-shift
332 orr r0, r0, r2, lsl #1 @ the region register value
333 orr r0, r0, #1 @ set enable bit
334 mcr p15, 0, r0, c6, c2, 0 @ set region 2, ROM/FLASH
335
336 mov r0, #0x06
337 mcr p15, 0, r0, c2, c0, 0 @ region 1,2 d-cacheable
338 mcr p15, 0, r0, c2, c0, 1 @ region 1,2 i-cacheable
339#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
340 mov r0, #0x00 @ disable whole write buffer
341#else
342 mov r0, #0x02 @ region 1 write bufferred
343#endif
344 mcr p15, 0, r0, c3, c0, 0
345
346/*
347 * Access Permission Settings for future permission control by PU.
348 *
349 * priv. user
350 * region 0 (whole) rw -- : b0001
351 * region 1 (RAM) rw rw : b0011
352 * region 2 (FLASH) rw r- : b0010
353 * region 3~7 (none) -- -- : b0000
354 */
355 mov r0, #0x00000031
356 orr r0, r0, #0x00000200
357 mcr p15, 0, r0, c5, c0, 2 @ set data access permission
358 mcr p15, 0, r0, c5, c0, 3 @ set inst. access permission
359
360 mrc p15, 0, r0, c1, c0 @ get control register
361 orr r0, r0, #0x00001000 @ I-cache
362 orr r0, r0, #0x00000005 @ MPU/D-cache
363#ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
364 orr r0, r0, #0x00004000 @ .1.. .... .... ....
365#endif
366 mov pc, lr
367
368 .size __arm946_setup, . - __arm946_setup
369
370 __INITDATA
371
372/*
373 * Purpose : Function pointers used to access above functions - all calls
374 * come through these
375 */
376 .type arm946_processor_functions, #object
377ENTRY(arm946_processor_functions)
378 .word nommu_early_abort
379 .word cpu_arm946_proc_init
380 .word cpu_arm946_proc_fin
381 .word cpu_arm946_reset
382 .word cpu_arm946_do_idle
383
384 .word cpu_arm946_dcache_clean_area
385 .word cpu_arm946_switch_mm
386 .word 0 @ cpu_*_set_pte
387 .size arm946_processor_functions, . - arm946_processor_functions
388
389 .section ".rodata"
390
391 .type cpu_arch_name, #object
392cpu_arch_name:
393 .asciz "armv5te"
394 .size cpu_arch_name, . - cpu_arch_name
395
396 .type cpu_elf_name, #object
397cpu_elf_name:
398 .asciz "v5t"
399 .size cpu_elf_name, . - cpu_elf_name
400
401 .type cpu_arm946_name, #object
402cpu_arm946_name:
403 .ascii "ARM946E-S"
404 .size cpu_arm946_name, . - cpu_arm946_name
405
406 .align
407
408 .section ".proc.info.init", #alloc, #execinstr
409 .type __arm946_proc_info,#object
410__arm946_proc_info:
411 .long 0x41009460
412 .long 0xff00fff0
413 .long 0
414 b __arm946_setup
415 .long cpu_arch_name
416 .long cpu_elf_name
417 .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB
418 .long cpu_arm946_name
419 .long arm946_processor_functions
420 .long 0
421 .long 0
422 .long arm940_cache_fns
423 .size __arm946_proc_info, . - __arm946_proc_info
424
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