| blob | 9a951239c86c0a1b93dcefdf6687312b6c3c51c7 |
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/hwcap.h>
17 #include <asm/pgtable-hwdef.h>
18 #include <asm/pgtable.h>
19 #include <asm/ptrace.h>
20 #include "proc-macros.S"
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 */
32 .text
33 /*
34 * cpu_arm946_proc_init()
35 * cpu_arm946_switch_mm()
36 *
37 * These are not required.
38 */
39 ENTRY(cpu_arm946_proc_init)
40 ENTRY(cpu_arm946_switch_mm)
41 mov pc, lr
43 /*
44 * cpu_arm946_proc_fin()
45 */
46 ENTRY(cpu_arm946_proc_fin)
47 stmfd sp!, {lr}
48 mov ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
49 msr cpsr_c, ip
50 bl arm946_flush_kern_cache_all
51 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
52 bic r0, r0, #0x00001000 @ i-cache
53 bic r0, r0, #0x00000004 @ d-cache
54 mcr p15, 0, r0, c1, c0, 0 @ disable caches
55 ldmfd sp!, {pc}
57 /*
58 * cpu_arm946_reset(loc)
59 * Params : r0 = address to jump to
60 * Notes : This sets up everything for a reset
61 */
62 ENTRY(cpu_arm946_reset)
63 mov ip, #0
64 mcr p15, 0, ip, c7, c5, 0 @ flush I cache
65 mcr p15, 0, ip, c7, c6, 0 @ flush D cache
66 mcr p15, 0, ip, c7, c10, 4 @ drain WB
67 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
68 bic ip, ip, #0x00000005 @ .............c.p
69 bic ip, ip, #0x00001000 @ i-cache
70 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
71 mov pc, r0
73 /*
74 * cpu_arm946_do_idle()
75 */
76 .align 5
77 ENTRY(cpu_arm946_do_idle)
78 mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
79 mov pc, lr
81 /*
82 * flush_user_cache_all()
83 */
84 ENTRY(arm946_flush_user_cache_all)
85 /* FALLTHROUGH */
87 /*
88 * flush_kern_cache_all()
89 *
90 * Clean and invalidate the entire cache.
91 */
92 ENTRY(arm946_flush_kern_cache_all)
93 mov r2, #VM_EXEC
94 mov ip, #0
95 __flush_whole_cache:
96 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
97 mcr p15, 0, ip, c7, c6, 0 @ flush D cache
98 #else
99 mov r1, #(CACHE_DSEGMENTS - 1) << 29 @ 4 segments
100 1: orr r3, r1, #(CACHE_DENTRIES - 1) << 4 @ n entries
101 2: mcr p15, 0, r3, c7, c14, 2 @ clean/flush D index
102 subs r3, r3, #1 << 4
103 bcs 2b @ entries n to 0
104 subs r1, r1, #1 << 29
105 bcs 1b @ segments 3 to 0
106 #endif
107 tst r2, #VM_EXEC
108 mcrne p15, 0, ip, c7, c5, 0 @ flush I cache
109 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
110 mov pc, lr
112 /*
113 * flush_user_cache_range(start, end, flags)
114 *
115 * Clean and invalidate a range of cache entries in the
116 * specified address range.
117 *
118 * - start - start address (inclusive)
119 * - end - end address (exclusive)
120 * - flags - vm_flags describing address space
121 * (same as arm926)
122 */
123 ENTRY(arm946_flush_user_cache_range)
124 mov ip, #0
125 sub r3, r1, r0 @ calculate total size
126 cmp r3, #CACHE_DLIMIT
127 bhs __flush_whole_cache
129 1: tst r2, #VM_EXEC
130 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
131 mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
132 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
133 add r0, r0, #CACHE_DLINESIZE
134 mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
135 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
136 add r0, r0, #CACHE_DLINESIZE
137 #else
138 mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D entry
139 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
140 add r0, r0, #CACHE_DLINESIZE
141 mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D entry
142 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
143 add r0, r0, #CACHE_DLINESIZE
144 #endif
145 cmp r0, r1
146 blo 1b
147 tst r2, #VM_EXEC
148 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
149 mov pc, lr
151 /*
152 * coherent_kern_range(start, end)
153 *
154 * Ensure coherency between the Icache and the Dcache in the
155 * region described by start, end. If you have non-snooping
156 * Harvard caches, you need to implement this function.
157 *
158 * - start - virtual start address
159 * - end - virtual end address
160 */
161 ENTRY(arm946_coherent_kern_range)
162 /* FALLTHROUGH */
164 /*
165 * coherent_user_range(start, end)
166 *
167 * Ensure coherency between the Icache and the Dcache in the
168 * region described by start, end. If you have non-snooping
169 * Harvard caches, you need to implement this function.
170 *
171 * - start - virtual start address
172 * - end - virtual end address
173 * (same as arm926)
174 */
175 ENTRY(arm946_coherent_user_range)
176 bic r0, r0, #CACHE_DLINESIZE - 1
177 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
178 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
179 add r0, r0, #CACHE_DLINESIZE
180 cmp r0, r1
181 blo 1b
182 mcr p15, 0, r0, c7, c10, 4 @ drain WB
183 mov pc, lr
185 /*
186 * flush_kern_dcache_area(void *addr, size_t size)
187 *
188 * Ensure no D cache aliasing occurs, either with itself or
189 * the I cache
190 *
191 * - addr - kernel address
192 * - size - region size
193 * (same as arm926)
194 */
195 ENTRY(arm946_flush_kern_dcache_area)
196 add r1, r0, r1
197 1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
198 add r0, r0, #CACHE_DLINESIZE
199 cmp r0, r1
200 blo 1b
201 mov r0, #0
202 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
203 mcr p15, 0, r0, c7, c10, 4 @ drain WB
204 mov pc, lr
206 /*
207 * dma_inv_range(start, end)
208 *
209 * Invalidate (discard) the specified virtual address range.
210 * May not write back any entries. If 'start' or 'end'
211 * are not cache line aligned, those lines must be written
212 * back.
213 *
214 * - start - virtual start address
215 * - end - virtual end address
216 * (same as arm926)
217 */
218 ENTRY(arm946_dma_inv_range)
219 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
220 tst r0, #CACHE_DLINESIZE - 1
221 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
222 tst r1, #CACHE_DLINESIZE - 1
223 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
224 #endif
225 bic r0, r0, #CACHE_DLINESIZE - 1
226 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
227 add r0, r0, #CACHE_DLINESIZE
228 cmp r0, r1
229 blo 1b
230 mcr p15, 0, r0, c7, c10, 4 @ drain WB
231 mov pc, lr
233 /*
234 * dma_clean_range(start, end)
235 *
236 * Clean the specified virtual address range.
237 *
238 * - start - virtual start address
239 * - end - virtual end address
240 *
241 * (same as arm926)
242 */
243 ENTRY(arm946_dma_clean_range)
244 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
245 bic r0, r0, #CACHE_DLINESIZE - 1
246 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
247 add r0, r0, #CACHE_DLINESIZE
248 cmp r0, r1
249 blo 1b
250 #endif
251 mcr p15, 0, r0, c7, c10, 4 @ drain WB
252 mov pc, lr
254 /*
255 * dma_flush_range(start, end)
256 *
257 * Clean and invalidate the specified virtual address range.
258 *
259 * - start - virtual start address
260 * - end - virtual end address
261 *
262 * (same as arm926)
263 */
264 ENTRY(arm946_dma_flush_range)
265 bic r0, r0, #CACHE_DLINESIZE - 1
266 1:
267 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
268 mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
269 #else
270 mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
271 #endif
272 add r0, r0, #CACHE_DLINESIZE
273 cmp r0, r1
274 blo 1b
275 mcr p15, 0, r0, c7, c10, 4 @ drain WB
276 mov pc, lr
278 ENTRY(arm946_cache_fns)
279 .long arm946_flush_kern_cache_all
280 .long arm946_flush_user_cache_all
281 .long arm946_flush_user_cache_range
282 .long arm946_coherent_kern_range
283 .long arm946_coherent_user_range
284 .long arm946_flush_kern_dcache_area
285 .long arm946_dma_inv_range
286 .long arm946_dma_clean_range
287 .long arm946_dma_flush_range
290 ENTRY(cpu_arm946_dcache_clean_area)
291 #ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
292 1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
293 add r0, r0, #CACHE_DLINESIZE
294 subs r1, r1, #CACHE_DLINESIZE
295 bhi 1b
296 #endif
297 mcr p15, 0, r0, c7, c10, 4 @ drain WB
298 mov pc, lr
300 __INIT
302 .type __arm946_setup, #function
303 __arm946_setup:
304 mov r0, #0
305 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
306 mcr p15, 0, r0, c7, c6, 0 @ invalidate D cache
307 mcr p15, 0, r0, c7, c10, 4 @ drain WB
309 mcr p15, 0, r0, c6, c3, 0 @ disable memory region 3~7
310 mcr p15, 0, r0, c6, c4, 0
311 mcr p15, 0, r0, c6, c5, 0
312 mcr p15, 0, r0, c6, c6, 0
313 mcr p15, 0, r0, c6, c7, 0
315 mov r0, #0x0000003F @ base = 0, size = 4GB
316 mcr p15, 0, r0, c6, c0, 0 @ set region 0, default
318 ldr r0, =(CONFIG_DRAM_BASE & 0xFFFFF000) @ base[31:12] of RAM
319 ldr r1, =(CONFIG_DRAM_SIZE >> 12) @ size of RAM (must be >= 4KB)
320 mov r2, #10 @ 11 is the minimum (4KB)
321 1: add r2, r2, #1 @ area size *= 2
322 mov r1, r1, lsr #1
323 bne 1b @ count not zero r-shift
324 orr r0, r0, r2, lsl #1 @ the region register value
325 orr r0, r0, #1 @ set enable bit
326 mcr p15, 0, r0, c6, c1, 0 @ set region 1, RAM
328 ldr r0, =(CONFIG_FLASH_MEM_BASE & 0xFFFFF000) @ base[31:12] of FLASH
329 ldr r1, =(CONFIG_FLASH_SIZE >> 12) @ size of FLASH (must be >= 4KB)
330 mov r2, #10 @ 11 is the minimum (4KB)
331 1: add r2, r2, #1 @ area size *= 2
332 mov r1, r1, lsr #1
333 bne 1b @ count not zero r-shift
334 orr r0, r0, r2, lsl #1 @ the region register value
335 orr r0, r0, #1 @ set enable bit
336 mcr p15, 0, r0, c6, c2, 0 @ set region 2, ROM/FLASH
338 mov r0, #0x06
339 mcr p15, 0, r0, c2, c0, 0 @ region 1,2 d-cacheable
340 mcr p15, 0, r0, c2, c0, 1 @ region 1,2 i-cacheable
341 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
342 mov r0, #0x00 @ disable whole write buffer
343 #else
344 mov r0, #0x02 @ region 1 write bufferred
345 #endif
346 mcr p15, 0, r0, c3, c0, 0
348 /*
349 * Access Permission Settings for future permission control by PU.
350 *
351 * priv. user
352 * region 0 (whole) rw -- : b0001
353 * region 1 (RAM) rw rw : b0011
354 * region 2 (FLASH) rw r- : b0010
355 * region 3~7 (none) -- -- : b0000
356 */
357 mov r0, #0x00000031
358 orr r0, r0, #0x00000200
359 mcr p15, 0, r0, c5, c0, 2 @ set data access permission
360 mcr p15, 0, r0, c5, c0, 3 @ set inst. access permission
362 mrc p15, 0, r0, c1, c0 @ get control register
363 orr r0, r0, #0x00001000 @ I-cache
364 orr r0, r0, #0x00000005 @ MPU/D-cache
365 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
366 orr r0, r0, #0x00004000 @ .1.. .... .... ....
367 #endif
368 mov pc, lr
370 .size __arm946_setup, . - __arm946_setup
372 __INITDATA
374 /*
375 * Purpose : Function pointers used to access above functions - all calls
376 * come through these
377 */
378 .type arm946_processor_functions, #object
379 ENTRY(arm946_processor_functions)
380 .word nommu_early_abort
381 .word legacy_pabort
382 .word cpu_arm946_proc_init
383 .word cpu_arm946_proc_fin
384 .word cpu_arm946_reset
385 .word cpu_arm946_do_idle
387 .word cpu_arm946_dcache_clean_area
388 .word cpu_arm946_switch_mm
389 .word 0 @ cpu_*_set_pte
390 .size arm946_processor_functions, . - arm946_processor_functions
392 .section ".rodata"
394 .type cpu_arch_name, #object
395 cpu_arch_name:
396 .asciz "armv5te"
397 .size cpu_arch_name, . - cpu_arch_name
399 .type cpu_elf_name, #object
400 cpu_elf_name:
401 .asciz "v5t"
402 .size cpu_elf_name, . - cpu_elf_name
404 .type cpu_arm946_name, #object
405 cpu_arm946_name:
406 .ascii "ARM946E-S"
407 .size cpu_arm946_name, . - cpu_arm946_name
409 .align
411 .section ".proc.info.init", #alloc, #execinstr
412 .type __arm946_proc_info,#object
413 __arm946_proc_info:
414 .long 0x41009460
415 .long 0xff00fff0
416 .long 0
417 b __arm946_setup
418 .long cpu_arch_name
419 .long cpu_elf_name
420 .long HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB
421 .long cpu_arm946_name
422 .long arm946_processor_functions
423 .long 0
424 .long 0
425 .long arm940_cache_fns
426 .size __arm946_proc_info, . - __arm946_proc_info