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1/*
2 * linux/arch/arm/mm/proc-mohawk.S: MMU functions for Marvell PJ1 core
3 *
4 * PJ1 (codename Mohawk) is a hybrid of the xscale3 and Marvell's own core.
5 *
6 * Heavily based on proc-arm926.S and proc-xsc3.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 as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22
23#include <linux/linkage.h>
24#include <linux/init.h>
25#include <asm/assembler.h>
26#include <asm/hwcap.h>
27#include <asm/pgtable-hwdef.h>
28#include <asm/pgtable.h>
29#include <asm/page.h>
30#include <asm/ptrace.h>
31#include "proc-macros.S"
32
33/*
34 * This is the maximum size of an area which will be flushed. If the
35 * area is larger than this, then we flush the whole cache.
36 */
37#define CACHE_DLIMIT 32768
38
39/*
40 * The cache line size of the L1 D cache.
41 */
42#define CACHE_DLINESIZE 32
43
44/*
45 * cpu_mohawk_proc_init()
46 */
47ENTRY(cpu_mohawk_proc_init)
48 mov pc, lr
49
50/*
51 * cpu_mohawk_proc_fin()
52 */
53ENTRY(cpu_mohawk_proc_fin)
54 stmfd sp!, {lr}
55 mov ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
56 msr cpsr_c, ip
57 bl mohawk_flush_kern_cache_all
58 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
59 bic r0, r0, #0x1800 @ ...iz...........
60 bic r0, r0, #0x0006 @ .............ca.
61 mcr p15, 0, r0, c1, c0, 0 @ disable caches
62 ldmfd sp!, {pc}
63
64/*
65 * cpu_mohawk_reset(loc)
66 *
67 * Perform a soft reset of the system. Put the CPU into the
68 * same state as it would be if it had been reset, and branch
69 * to what would be the reset vector.
70 *
71 * loc: location to jump to for soft reset
72 *
73 * (same as arm926)
74 */
75 .align 5
76ENTRY(cpu_mohawk_reset)
77 mov ip, #0
78 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
79 mcr p15, 0, ip, c7, c10, 4 @ drain WB
80 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
81 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
82 bic ip, ip, #0x0007 @ .............cam
83 bic ip, ip, #0x1100 @ ...i...s........
84 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
85 mov pc, r0
86
87/*
88 * cpu_mohawk_do_idle()
89 *
90 * Called with IRQs disabled
91 */
92 .align 5
93ENTRY(cpu_mohawk_do_idle)
94 mov r0, #0
95 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
96 mcr p15, 0, r0, c7, c0, 4 @ wait for interrupt
97 mov pc, lr
98
99/*
100 * flush_user_cache_all()
101 *
102 * Clean and invalidate all cache entries in a particular
103 * address space.
104 */
105ENTRY(mohawk_flush_user_cache_all)
106 /* FALLTHROUGH */
107
108/*
109 * flush_kern_cache_all()
110 *
111 * Clean and invalidate the entire cache.
112 */
113ENTRY(mohawk_flush_kern_cache_all)
114 mov r2, #VM_EXEC
115 mov ip, #0
116__flush_whole_cache:
117 mcr p15, 0, ip, c7, c14, 0 @ clean & invalidate all D cache
118 tst r2, #VM_EXEC
119 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
120 mcrne p15, 0, ip, c7, c10, 0 @ drain write buffer
121 mov pc, lr
122
123/*
124 * flush_user_cache_range(start, end, flags)
125 *
126 * Clean and invalidate a range of cache entries in the
127 * specified address range.
128 *
129 * - start - start address (inclusive)
130 * - end - end address (exclusive)
131 * - flags - vm_flags describing address space
132 *
133 * (same as arm926)
134 */
135ENTRY(mohawk_flush_user_cache_range)
136 mov ip, #0
137 sub r3, r1, r0 @ calculate total size
138 cmp r3, #CACHE_DLIMIT
139 bgt __flush_whole_cache
1401: tst r2, #VM_EXEC
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 mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D entry
145 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
146 add r0, r0, #CACHE_DLINESIZE
147 cmp r0, r1
148 blo 1b
149 tst r2, #VM_EXEC
150 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
151 mov pc, lr
152
153/*
154 * coherent_kern_range(start, end)
155 *
156 * Ensure coherency between the Icache and the Dcache in the
157 * region described by start, end. If you have non-snooping
158 * Harvard caches, you need to implement this function.
159 *
160 * - start - virtual start address
161 * - end - virtual end address
162 */
163ENTRY(mohawk_coherent_kern_range)
164 /* FALLTHROUGH */
165
166/*
167 * coherent_user_range(start, end)
168 *
169 * Ensure coherency between the Icache and the Dcache in the
170 * region described by start, end. If you have non-snooping
171 * Harvard caches, you need to implement this function.
172 *
173 * - start - virtual start address
174 * - end - virtual end address
175 *
176 * (same as arm926)
177 */
178ENTRY(mohawk_coherent_user_range)
179 bic r0, r0, #CACHE_DLINESIZE - 1
1801: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
181 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
182 add r0, r0, #CACHE_DLINESIZE
183 cmp r0, r1
184 blo 1b
185 mcr p15, 0, r0, c7, c10, 4 @ drain WB
186 mov pc, lr
187
188/*
189 * flush_kern_dcache_page(void *page)
190 *
191 * Ensure no D cache aliasing occurs, either with itself or
192 * the I cache
193 *
194 * - addr - page aligned address
195 */
196ENTRY(mohawk_flush_kern_dcache_page)
197 add r1, r0, #PAGE_SZ
1981: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
199 add r0, r0, #CACHE_DLINESIZE
200 cmp r0, r1
201 blo 1b
202 mov r0, #0
203 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
204 mcr p15, 0, r0, c7, c10, 4 @ drain WB
205 mov pc, lr
206
207/*
208 * dma_inv_range(start, end)
209 *
210 * Invalidate (discard) the specified virtual address range.
211 * May not write back any entries. If 'start' or 'end'
212 * are not cache line aligned, those lines must be written
213 * back.
214 *
215 * - start - virtual start address
216 * - end - virtual end address
217 *
218 * (same as v4wb)
219 */
220ENTRY(mohawk_dma_inv_range)
221 tst r0, #CACHE_DLINESIZE - 1
222 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
223 tst r1, #CACHE_DLINESIZE - 1
224 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
225 bic r0, r0, #CACHE_DLINESIZE - 1
2261: 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
232
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 v4wb)
242 */
243ENTRY(mohawk_dma_clean_range)
244 bic r0, r0, #CACHE_DLINESIZE - 1
2451: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
246 add r0, r0, #CACHE_DLINESIZE
247 cmp r0, r1
248 blo 1b
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 */
260ENTRY(mohawk_dma_flush_range)
261 bic r0, r0, #CACHE_DLINESIZE - 1
2621:
263 mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
264 add r0, r0, #CACHE_DLINESIZE
265 cmp r0, r1
266 blo 1b
267 mcr p15, 0, r0, c7, c10, 4 @ drain WB
268 mov pc, lr
269
270ENTRY(mohawk_cache_fns)
271 .long mohawk_flush_kern_cache_all
272 .long mohawk_flush_user_cache_all
273 .long mohawk_flush_user_cache_range
274 .long mohawk_coherent_kern_range
275 .long mohawk_coherent_user_range
276 .long mohawk_flush_kern_dcache_page
277 .long mohawk_dma_inv_range
278 .long mohawk_dma_clean_range
279 .long mohawk_dma_flush_range
280
281ENTRY(cpu_mohawk_dcache_clean_area)
2821: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
283 add r0, r0, #CACHE_DLINESIZE
284 subs r1, r1, #CACHE_DLINESIZE
285 bhi 1b
286 mcr p15, 0, r0, c7, c10, 4 @ drain WB
287 mov pc, lr
288
289/*
290 * cpu_mohawk_switch_mm(pgd)
291 *
292 * Set the translation base pointer to be as described by pgd.
293 *
294 * pgd: new page tables
295 */
296 .align 5
297ENTRY(cpu_mohawk_switch_mm)
298 mov ip, #0
299 mcr p15, 0, ip, c7, c14, 0 @ clean & invalidate all D cache
300 mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
301 mcr p15, 0, ip, c7, c10, 4 @ drain WB
302 orr r0, r0, #0x18 @ cache the page table in L2
303 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
304 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
305 mov pc, lr
306
307/*
308 * cpu_mohawk_set_pte_ext(ptep, pte, ext)
309 *
310 * Set a PTE and flush it out
311 */
312 .align 5
313ENTRY(cpu_mohawk_set_pte_ext)
314 armv3_set_pte_ext
315 mov r0, r0
316 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
317 mcr p15, 0, r0, c7, c10, 4 @ drain WB
318 mov pc, lr
319
320 __INIT
321
322 .type __mohawk_setup, #function
323__mohawk_setup:
324 mov r0, #0
325 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches
326 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
327 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs
328 orr r4, r4, #0x18 @ cache the page table in L2
329 mcr p15, 0, r4, c2, c0, 0 @ load page table pointer
330
331 mov r0, #0 @ don't allow CP access
332 mcr p15, 0, r0, c15, c1, 0 @ write CP access register
333
334 adr r5, mohawk_crval
335 ldmia r5, {r5, r6}
336 mrc p15, 0, r0, c1, c0 @ get control register
337 bic r0, r0, r5
338 orr r0, r0, r6
339 mov pc, lr
340
341 .size __mohawk_setup, . - __mohawk_setup
342
343 /*
344 * R
345 * .RVI ZFRS BLDP WCAM
346 * .011 1001 ..00 0101
347 *
348 */
349 .type mohawk_crval, #object
350mohawk_crval:
351 crval clear=0x00007f3f, mmuset=0x00003905, ucset=0x00001134
352
353 __INITDATA
354
355/*
356 * Purpose : Function pointers used to access above functions - all calls
357 * come through these
358 */
359 .type mohawk_processor_functions, #object
360mohawk_processor_functions:
361 .word v5t_early_abort
362 .word pabort_noifar
363 .word cpu_mohawk_proc_init
364 .word cpu_mohawk_proc_fin
365 .word cpu_mohawk_reset
366 .word cpu_mohawk_do_idle
367 .word cpu_mohawk_dcache_clean_area
368 .word cpu_mohawk_switch_mm
369 .word cpu_mohawk_set_pte_ext
370 .size mohawk_processor_functions, . - mohawk_processor_functions
371
372 .section ".rodata"
373
374 .type cpu_arch_name, #object
375cpu_arch_name:
376 .asciz "armv5te"
377 .size cpu_arch_name, . - cpu_arch_name
378
379 .type cpu_elf_name, #object
380cpu_elf_name:
381 .asciz "v5"
382 .size cpu_elf_name, . - cpu_elf_name
383
384 .type cpu_mohawk_name, #object
385cpu_mohawk_name:
386 .asciz "Marvell 88SV331x"
387 .size cpu_mohawk_name, . - cpu_mohawk_name
388
389 .align
390
391 .section ".proc.info.init", #alloc, #execinstr
392
393 .type __88sv331x_proc_info,#object
394__88sv331x_proc_info:
395 .long 0x56158000 @ Marvell 88SV331x (MOHAWK)
396 .long 0xfffff000
397 .long PMD_TYPE_SECT | \
398 PMD_SECT_BUFFERABLE | \
399 PMD_SECT_CACHEABLE | \
400 PMD_BIT4 | \
401 PMD_SECT_AP_WRITE | \
402 PMD_SECT_AP_READ
403 .long PMD_TYPE_SECT | \
404 PMD_BIT4 | \
405 PMD_SECT_AP_WRITE | \
406 PMD_SECT_AP_READ
407 b __mohawk_setup
408 .long cpu_arch_name
409 .long cpu_elf_name
410 .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP
411 .long cpu_mohawk_name
412 .long mohawk_processor_functions
413 .long v4wbi_tlb_fns
414 .long v4wb_user_fns
415 .long mohawk_cache_fns
416 .size __88sv331x_proc_info, . - __88sv331x_proc_info
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-18 10:36:27 -0500