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Hyok S. Choif37f46e2006-09-26 17:38:32 +09001/*
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>
Russell King5ec94072008-09-07 19:15:31 +010016#include <asm/hwcap.h>
Hyok S. Choif37f46e2006-09-26 17:38:32 +090017#include <asm/pgtable-hwdef.h>
18#include <asm/pgtable.h>
Hyok S. Choif37f46e2006-09-26 17:38:32 +090019#include <asm/ptrace.h>
Russell King8a5544c82008-08-12 14:02:23 +010020#include "proc-macros.S"
Hyok S. Choif37f46e2006-09-26 17:38:32 +090021
22/*
23 * ARM946E-S is synthesizable to have 0KB to 1MB sized D-Cache,
24 * comprising 256 lines of 32 bytes (8 words).
25 */
26#define CACHE_DSIZE (CONFIG_CPU_DCACHE_SIZE) /* typically 8KB. */
27#define CACHE_DLINESIZE 32 /* fixed */
28#define CACHE_DSEGMENTS 4 /* fixed */
29#define CACHE_DENTRIES (CACHE_DSIZE / CACHE_DSEGMENTS / CACHE_DLINESIZE)
30#define CACHE_DLIMIT (CACHE_DSIZE * 4) /* benchmark needed */
31
32 .text
33/*
34 * cpu_arm946_proc_init()
35 * cpu_arm946_switch_mm()
36 *
37 * These are not required.
38 */
39ENTRY(cpu_arm946_proc_init)
40ENTRY(cpu_arm946_switch_mm)
41 mov pc, lr
42
43/*
44 * cpu_arm946_proc_fin()
45 */
46ENTRY(cpu_arm946_proc_fin)
Hyok S. Choif37f46e2006-09-26 17:38:32 +090047 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
48 bic r0, r0, #0x00001000 @ i-cache
49 bic r0, r0, #0x00000004 @ d-cache
50 mcr p15, 0, r0, c1, c0, 0 @ disable caches
Russell King9ca03a22010-07-26 12:22:12 +010051 mov pc, lr
Hyok S. Choif37f46e2006-09-26 17:38:32 +090052
53/*
54 * cpu_arm946_reset(loc)
55 * Params : r0 = address to jump to
56 * Notes : This sets up everything for a reset
57 */
Will Deacon1a4baaf2011-11-15 13:25:04 +000058 .pushsection .idmap.text, "ax"
Hyok S. Choif37f46e2006-09-26 17:38:32 +090059ENTRY(cpu_arm946_reset)
60 mov ip, #0
61 mcr p15, 0, ip, c7, c5, 0 @ flush I cache
62 mcr p15, 0, ip, c7, c6, 0 @ flush D cache
63 mcr p15, 0, ip, c7, c10, 4 @ drain WB
64 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
65 bic ip, ip, #0x00000005 @ .............c.p
66 bic ip, ip, #0x00001000 @ i-cache
67 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
68 mov pc, r0
Will Deacon1a4baaf2011-11-15 13:25:04 +000069ENDPROC(cpu_arm946_reset)
70 .popsection
Hyok S. Choif37f46e2006-09-26 17:38:32 +090071
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/*
Mika Westerbergc8c90862010-10-28 11:27:40 +010081 * flush_icache_all()
82 *
83 * Unconditionally clean and invalidate the entire icache.
84 */
85ENTRY(arm946_flush_icache_all)
86 mov r0, #0
87 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
88 mov pc, lr
89ENDPROC(arm946_flush_icache_all)
90
91/*
Hyok S. Choif37f46e2006-09-26 17:38:32 +090092 * flush_user_cache_all()
93 */
94ENTRY(arm946_flush_user_cache_all)
95 /* FALLTHROUGH */
96
97/*
98 * flush_kern_cache_all()
99 *
100 * Clean and invalidate the entire cache.
101 */
102ENTRY(arm946_flush_kern_cache_all)
103 mov r2, #VM_EXEC
104 mov ip, #0
105__flush_whole_cache:
106#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
107 mcr p15, 0, ip, c7, c6, 0 @ flush D cache
108#else
109 mov r1, #(CACHE_DSEGMENTS - 1) << 29 @ 4 segments
1101: orr r3, r1, #(CACHE_DENTRIES - 1) << 4 @ n entries
1112: mcr p15, 0, r3, c7, c14, 2 @ clean/flush D index
112 subs r3, r3, #1 << 4
113 bcs 2b @ entries n to 0
114 subs r1, r1, #1 << 29
115 bcs 1b @ segments 3 to 0
116#endif
117 tst r2, #VM_EXEC
118 mcrne p15, 0, ip, c7, c5, 0 @ flush I cache
119 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
120 mov pc, lr
121
122/*
123 * flush_user_cache_range(start, end, flags)
124 *
125 * Clean and invalidate a range of cache entries in the
126 * specified address range.
127 *
128 * - start - start address (inclusive)
129 * - end - end address (exclusive)
130 * - flags - vm_flags describing address space
131 * (same as arm926)
132 */
133ENTRY(arm946_flush_user_cache_range)
134 mov ip, #0
135 sub r3, r1, r0 @ calculate total size
136 cmp r3, #CACHE_DLIMIT
137 bhs __flush_whole_cache
138
1391: tst r2, #VM_EXEC
140#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
141 mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
142 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
143 add r0, r0, #CACHE_DLINESIZE
144 mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
145 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
146 add r0, r0, #CACHE_DLINESIZE
147#else
148 mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D entry
149 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
150 add r0, r0, #CACHE_DLINESIZE
151 mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D entry
152 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
153 add r0, r0, #CACHE_DLINESIZE
154#endif
155 cmp r0, r1
156 blo 1b
157 tst r2, #VM_EXEC
158 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
159 mov pc, lr
160
161/*
162 * coherent_kern_range(start, end)
163 *
164 * Ensure coherency between the Icache and the Dcache in the
165 * region described by start, end. If you have non-snooping
166 * Harvard caches, you need to implement this function.
167 *
168 * - start - virtual start address
169 * - end - virtual end address
170 */
171ENTRY(arm946_coherent_kern_range)
172 /* FALLTHROUGH */
173
174/*
175 * coherent_user_range(start, end)
176 *
177 * Ensure coherency between the Icache and the Dcache in the
178 * region described by start, end. If you have non-snooping
179 * Harvard caches, you need to implement this function.
180 *
181 * - start - virtual start address
182 * - end - virtual end address
183 * (same as arm926)
184 */
185ENTRY(arm946_coherent_user_range)
186 bic r0, r0, #CACHE_DLINESIZE - 1
1871: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
188 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
189 add r0, r0, #CACHE_DLINESIZE
190 cmp r0, r1
191 blo 1b
192 mcr p15, 0, r0, c7, c10, 4 @ drain WB
Will Deaconc5102f52012-04-27 13:08:53 +0100193 mov r0, #0
Hyok S. Choif37f46e2006-09-26 17:38:32 +0900194 mov pc, lr
195
196/*
Russell King2c9b9c82009-11-26 12:56:21 +0000197 * flush_kern_dcache_area(void *addr, size_t size)
Hyok S. Choif37f46e2006-09-26 17:38:32 +0900198 *
199 * Ensure no D cache aliasing occurs, either with itself or
200 * the I cache
201 *
Russell King2c9b9c82009-11-26 12:56:21 +0000202 * - addr - kernel address
203 * - size - region size
Hyok S. Choif37f46e2006-09-26 17:38:32 +0900204 * (same as arm926)
205 */
Russell King2c9b9c82009-11-26 12:56:21 +0000206ENTRY(arm946_flush_kern_dcache_area)
207 add r1, r0, r1
Hyok S. Choif37f46e2006-09-26 17:38:32 +09002081: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
209 add r0, r0, #CACHE_DLINESIZE
210 cmp r0, r1
211 blo 1b
212 mov r0, #0
213 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
214 mcr p15, 0, r0, c7, c10, 4 @ drain WB
215 mov pc, lr
216
217/*
218 * dma_inv_range(start, end)
219 *
220 * Invalidate (discard) the specified virtual address range.
221 * May not write back any entries. If 'start' or 'end'
222 * are not cache line aligned, those lines must be written
223 * back.
224 *
225 * - start - virtual start address
226 * - end - virtual end address
227 * (same as arm926)
228 */
Russell King702b94b2009-11-26 16:24:19 +0000229arm946_dma_inv_range:
Hyok S. Choif37f46e2006-09-26 17:38:32 +0900230#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
231 tst r0, #CACHE_DLINESIZE - 1
232 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
233 tst r1, #CACHE_DLINESIZE - 1
234 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
235#endif
236 bic r0, r0, #CACHE_DLINESIZE - 1
2371: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
238 add r0, r0, #CACHE_DLINESIZE
239 cmp r0, r1
240 blo 1b
241 mcr p15, 0, r0, c7, c10, 4 @ drain WB
242 mov pc, lr
243
244/*
245 * dma_clean_range(start, end)
246 *
247 * Clean the specified virtual address range.
248 *
249 * - start - virtual start address
250 * - end - virtual end address
251 *
252 * (same as arm926)
253 */
Russell King702b94b2009-11-26 16:24:19 +0000254arm946_dma_clean_range:
Hyok S. Choif37f46e2006-09-26 17:38:32 +0900255#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
256 bic r0, r0, #CACHE_DLINESIZE - 1
2571: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
258 add r0, r0, #CACHE_DLINESIZE
259 cmp r0, r1
260 blo 1b
261#endif
262 mcr p15, 0, r0, c7, c10, 4 @ drain WB
263 mov pc, lr
264
265/*
266 * dma_flush_range(start, end)
267 *
268 * Clean and invalidate the specified virtual address range.
269 *
270 * - start - virtual start address
271 * - end - virtual end address
272 *
273 * (same as arm926)
274 */
275ENTRY(arm946_dma_flush_range)
276 bic r0, r0, #CACHE_DLINESIZE - 1
2771:
278#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
279 mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
280#else
Lennert Buytenhekb3a8b752008-05-10 21:05:31 +0100281 mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
Hyok S. Choif37f46e2006-09-26 17:38:32 +0900282#endif
283 add r0, r0, #CACHE_DLINESIZE
284 cmp r0, r1
285 blo 1b
286 mcr p15, 0, r0, c7, c10, 4 @ drain WB
287 mov pc, lr
288
Russell Kinga9c91472009-11-26 16:19:58 +0000289/*
290 * dma_map_area(start, size, dir)
291 * - start - kernel virtual start address
292 * - size - size of region
293 * - dir - DMA direction
294 */
295ENTRY(arm946_dma_map_area)
296 add r1, r1, r0
297 cmp r2, #DMA_TO_DEVICE
298 beq arm946_dma_clean_range
299 bcs arm946_dma_inv_range
300 b arm946_dma_flush_range
301ENDPROC(arm946_dma_map_area)
302
303/*
304 * dma_unmap_area(start, size, dir)
305 * - start - kernel virtual start address
306 * - size - size of region
307 * - dir - DMA direction
308 */
309ENTRY(arm946_dma_unmap_area)
310 mov pc, lr
311ENDPROC(arm946_dma_unmap_area)
312
Lorenzo Pieralisi031bd872012-09-06 18:35:13 +0530313 .globl arm946_flush_kern_cache_louis
314 .equ arm946_flush_kern_cache_louis, arm946_flush_kern_cache_all
315
Dave Martinb1b98922011-06-23 17:21:17 +0100316 @ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
317 define_cache_functions arm946
Hyok S. Choif37f46e2006-09-26 17:38:32 +0900318
319ENTRY(cpu_arm946_dcache_clean_area)
320#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
3211: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
322 add r0, r0, #CACHE_DLINESIZE
323 subs r1, r1, #CACHE_DLINESIZE
324 bhi 1b
325#endif
326 mcr p15, 0, r0, c7, c10, 4 @ drain WB
327 mov pc, lr
328
Russell King5085f3f2010-10-01 15:37:05 +0100329 __CPUINIT
Hyok S. Choif37f46e2006-09-26 17:38:32 +0900330
331 .type __arm946_setup, #function
332__arm946_setup:
333 mov r0, #0
334 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
335 mcr p15, 0, r0, c7, c6, 0 @ invalidate D cache
336 mcr p15, 0, r0, c7, c10, 4 @ drain WB
337
338 mcr p15, 0, r0, c6, c3, 0 @ disable memory region 3~7
339 mcr p15, 0, r0, c6, c4, 0
340 mcr p15, 0, r0, c6, c5, 0
341 mcr p15, 0, r0, c6, c6, 0
342 mcr p15, 0, r0, c6, c7, 0
343
344 mov r0, #0x0000003F @ base = 0, size = 4GB
345 mcr p15, 0, r0, c6, c0, 0 @ set region 0, default
346
347 ldr r0, =(CONFIG_DRAM_BASE & 0xFFFFF000) @ base[31:12] of RAM
348 ldr r1, =(CONFIG_DRAM_SIZE >> 12) @ size of RAM (must be >= 4KB)
349 mov r2, #10 @ 11 is the minimum (4KB)
3501: add r2, r2, #1 @ area size *= 2
351 mov r1, r1, lsr #1
352 bne 1b @ count not zero r-shift
353 orr r0, r0, r2, lsl #1 @ the region register value
354 orr r0, r0, #1 @ set enable bit
355 mcr p15, 0, r0, c6, c1, 0 @ set region 1, RAM
356
357 ldr r0, =(CONFIG_FLASH_MEM_BASE & 0xFFFFF000) @ base[31:12] of FLASH
358 ldr r1, =(CONFIG_FLASH_SIZE >> 12) @ size of FLASH (must be >= 4KB)
359 mov r2, #10 @ 11 is the minimum (4KB)
3601: add r2, r2, #1 @ area size *= 2
361 mov r1, r1, lsr #1
362 bne 1b @ count not zero r-shift
363 orr r0, r0, r2, lsl #1 @ the region register value
364 orr r0, r0, #1 @ set enable bit
365 mcr p15, 0, r0, c6, c2, 0 @ set region 2, ROM/FLASH
366
367 mov r0, #0x06
368 mcr p15, 0, r0, c2, c0, 0 @ region 1,2 d-cacheable
369 mcr p15, 0, r0, c2, c0, 1 @ region 1,2 i-cacheable
370#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
371 mov r0, #0x00 @ disable whole write buffer
372#else
373 mov r0, #0x02 @ region 1 write bufferred
374#endif
375 mcr p15, 0, r0, c3, c0, 0
376
377/*
378 * Access Permission Settings for future permission control by PU.
379 *
380 * priv. user
381 * region 0 (whole) rw -- : b0001
382 * region 1 (RAM) rw rw : b0011
383 * region 2 (FLASH) rw r- : b0010
384 * region 3~7 (none) -- -- : b0000
385 */
386 mov r0, #0x00000031
387 orr r0, r0, #0x00000200
388 mcr p15, 0, r0, c5, c0, 2 @ set data access permission
389 mcr p15, 0, r0, c5, c0, 3 @ set inst. access permission
390
391 mrc p15, 0, r0, c1, c0 @ get control register
392 orr r0, r0, #0x00001000 @ I-cache
393 orr r0, r0, #0x00000005 @ MPU/D-cache
394#ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
395 orr r0, r0, #0x00004000 @ .1.. .... .... ....
396#endif
397 mov pc, lr
398
399 .size __arm946_setup, . - __arm946_setup
400
401 __INITDATA
402
Dave Martinb1b98922011-06-23 17:21:17 +0100403 @ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
404 define_processor_functions arm946, dabort=nommu_early_abort, pabort=legacy_pabort, nommu=1
Hyok S. Choif37f46e2006-09-26 17:38:32 +0900405
406 .section ".rodata"
407
Dave Martinb1b98922011-06-23 17:21:17 +0100408 string cpu_arch_name, "armv5te"
409 string cpu_elf_name, "v5t"
410 string cpu_arm946_name, "ARM946E-S"
Hyok S. Choif37f46e2006-09-26 17:38:32 +0900411
412 .align
413
414 .section ".proc.info.init", #alloc, #execinstr
415 .type __arm946_proc_info,#object
416__arm946_proc_info:
417 .long 0x41009460
418 .long 0xff00fff0
419 .long 0
Brian S. Julin7760d542011-07-24 16:53:50 +0100420 .long 0
Hyok S. Choif37f46e2006-09-26 17:38:32 +0900421 b __arm946_setup
422 .long cpu_arch_name
423 .long cpu_elf_name
424 .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB
425 .long cpu_arm946_name
426 .long arm946_processor_functions
427 .long 0
428 .long 0
Brian S. Julin7760d542011-07-24 16:53:50 +0100429 .long arm946_cache_fns
Hyok S. Choif37f46e2006-09-26 17:38:32 +0900430 .size __arm946_proc_info, . - __arm946_proc_info
431