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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 mrc p15, 0, r0, c1, c0, 0 @ ctrl register
55 bic r0, r0, #0x1800 @ ...iz...........
56 bic r0, r0, #0x0006 @ .............ca.
57 mcr p15, 0, r0, c1, c0, 0 @ disable caches
58 mov pc, lr
59
60/*
61 * cpu_mohawk_reset(loc)
62 *
63 * Perform a soft reset of the system. Put the CPU into the
64 * same state as it would be if it had been reset, and branch
65 * to what would be the reset vector.
66 *
67 * loc: location to jump to for soft reset
68 *
69 * (same as arm926)
70 */
71 .align 5
72 .pushsection .idmap.text, "ax"
73ENTRY(cpu_mohawk_reset)
74 mov ip, #0
75 mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
76 mcr p15, 0, ip, c7, c10, 4 @ drain WB
77 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
78 mrc p15, 0, ip, c1, c0, 0 @ ctrl register
79 bic ip, ip, #0x0007 @ .............cam
80 bic ip, ip, #0x1100 @ ...i...s........
81 mcr p15, 0, ip, c1, c0, 0 @ ctrl register
82 mov pc, r0
83ENDPROC(cpu_mohawk_reset)
84 .popsection
85
86/*
87 * cpu_mohawk_do_idle()
88 *
89 * Called with IRQs disabled
90 */
91 .align 5
92ENTRY(cpu_mohawk_do_idle)
93 mov r0, #0
94 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
95 mcr p15, 0, r0, c7, c0, 4 @ wait for interrupt
96 mov pc, lr
97
98/*
99 * flush_icache_all()
100 *
101 * Unconditionally clean and invalidate the entire icache.
102 */
103ENTRY(mohawk_flush_icache_all)
104 mov r0, #0
105 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
106 mov pc, lr
107ENDPROC(mohawk_flush_icache_all)
108
109/*
110 * flush_user_cache_all()
111 *
112 * Clean and invalidate all cache entries in a particular
113 * address space.
114 */
115ENTRY(mohawk_flush_user_cache_all)
116 /* FALLTHROUGH */
117
118/*
119 * flush_kern_cache_all()
120 *
121 * Clean and invalidate the entire cache.
122 */
123ENTRY(mohawk_flush_kern_cache_all)
124 mov r2, #VM_EXEC
125 mov ip, #0
126__flush_whole_cache:
127 mcr p15, 0, ip, c7, c14, 0 @ clean & invalidate all D cache
128 tst r2, #VM_EXEC
129 mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
130 mcrne p15, 0, ip, c7, c10, 0 @ drain write buffer
131 mov pc, lr
132
133/*
134 * flush_user_cache_range(start, end, flags)
135 *
136 * Clean and invalidate a range of cache entries in the
137 * specified address range.
138 *
139 * - start - start address (inclusive)
140 * - end - end address (exclusive)
141 * - flags - vm_flags describing address space
142 *
143 * (same as arm926)
144 */
145ENTRY(mohawk_flush_user_cache_range)
146 mov ip, #0
147 sub r3, r1, r0 @ calculate total size
148 cmp r3, #CACHE_DLIMIT
149 bgt __flush_whole_cache
1501: tst r2, #VM_EXEC
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 mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D entry
155 mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry
156 add r0, r0, #CACHE_DLINESIZE
157 cmp r0, r1
158 blo 1b
159 tst r2, #VM_EXEC
160 mcrne p15, 0, ip, c7, c10, 4 @ drain WB
161 mov pc, lr
162
163/*
164 * coherent_kern_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 */
173ENTRY(mohawk_coherent_kern_range)
174 /* FALLTHROUGH */
175
176/*
177 * coherent_user_range(start, end)
178 *
179 * Ensure coherency between the Icache and the Dcache in the
180 * region described by start, end. If you have non-snooping
181 * Harvard caches, you need to implement this function.
182 *
183 * - start - virtual start address
184 * - end - virtual end address
185 *
186 * (same as arm926)
187 */
188ENTRY(mohawk_coherent_user_range)
189 bic r0, r0, #CACHE_DLINESIZE - 1
1901: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
191 mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry
192 add r0, r0, #CACHE_DLINESIZE
193 cmp r0, r1
194 blo 1b
195 mcr p15, 0, r0, c7, c10, 4 @ drain WB
196 mov r0, #0
197 mov pc, lr
198
199/*
200 * flush_kern_dcache_area(void *addr, size_t size)
201 *
202 * Ensure no D cache aliasing occurs, either with itself or
203 * the I cache
204 *
205 * - addr - kernel address
206 * - size - region size
207 */
208ENTRY(mohawk_flush_kern_dcache_area)
209 add r1, r0, r1
2101: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
211 add r0, r0, #CACHE_DLINESIZE
212 cmp r0, r1
213 blo 1b
214 mov r0, #0
215 mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
216 mcr p15, 0, r0, c7, c10, 4 @ drain WB
217 mov pc, lr
218
219/*
220 * dma_inv_range(start, end)
221 *
222 * Invalidate (discard) the specified virtual address range.
223 * May not write back any entries. If 'start' or 'end'
224 * are not cache line aligned, those lines must be written
225 * back.
226 *
227 * - start - virtual start address
228 * - end - virtual end address
229 *
230 * (same as v4wb)
231 */
232mohawk_dma_inv_range:
233 tst r0, #CACHE_DLINESIZE - 1
234 mcrne p15, 0, r0, c7, c10, 1 @ clean D entry
235 tst r1, #CACHE_DLINESIZE - 1
236 mcrne p15, 0, r1, c7, c10, 1 @ clean D entry
237 bic r0, r0, #CACHE_DLINESIZE - 1
2381: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry
239 add r0, r0, #CACHE_DLINESIZE
240 cmp r0, r1
241 blo 1b
242 mcr p15, 0, r0, c7, c10, 4 @ drain WB
243 mov pc, lr
244
245/*
246 * dma_clean_range(start, end)
247 *
248 * Clean the specified virtual address range.
249 *
250 * - start - virtual start address
251 * - end - virtual end address
252 *
253 * (same as v4wb)
254 */
255mohawk_dma_clean_range:
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 mcr p15, 0, r0, c7, c10, 4 @ drain WB
262 mov pc, lr
263
264/*
265 * dma_flush_range(start, end)
266 *
267 * Clean and invalidate the specified virtual address range.
268 *
269 * - start - virtual start address
270 * - end - virtual end address
271 */
272ENTRY(mohawk_dma_flush_range)
273 bic r0, r0, #CACHE_DLINESIZE - 1
2741:
275 mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry
276 add r0, r0, #CACHE_DLINESIZE
277 cmp r0, r1
278 blo 1b
279 mcr p15, 0, r0, c7, c10, 4 @ drain WB
280 mov pc, lr
281
282/*
283 * dma_map_area(start, size, dir)
284 * - start - kernel virtual start address
285 * - size - size of region
286 * - dir - DMA direction
287 */
288ENTRY(mohawk_dma_map_area)
289 add r1, r1, r0
290 cmp r2, #DMA_TO_DEVICE
291 beq mohawk_dma_clean_range
292 bcs mohawk_dma_inv_range
293 b mohawk_dma_flush_range
294ENDPROC(mohawk_dma_map_area)
295
296/*
297 * dma_unmap_area(start, size, dir)
298 * - start - kernel virtual start address
299 * - size - size of region
300 * - dir - DMA direction
301 */
302ENTRY(mohawk_dma_unmap_area)
303 mov pc, lr
304ENDPROC(mohawk_dma_unmap_area)
305
306 @ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
307 define_cache_functions mohawk
308
309ENTRY(cpu_mohawk_dcache_clean_area)
3101: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
311 add r0, r0, #CACHE_DLINESIZE
312 subs r1, r1, #CACHE_DLINESIZE
313 bhi 1b
314 mcr p15, 0, r0, c7, c10, 4 @ drain WB
315 mov pc, lr
316
317/*
318 * cpu_mohawk_switch_mm(pgd)
319 *
320 * Set the translation base pointer to be as described by pgd.
321 *
322 * pgd: new page tables
323 */
324 .align 5
325ENTRY(cpu_mohawk_switch_mm)
326 mov ip, #0
327 mcr p15, 0, ip, c7, c14, 0 @ clean & invalidate all D cache
328 mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
329 mcr p15, 0, ip, c7, c10, 4 @ drain WB
330 orr r0, r0, #0x18 @ cache the page table in L2
331 mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
332 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
333 mov pc, lr
334
335/*
336 * cpu_mohawk_set_pte_ext(ptep, pte, ext)
337 *
338 * Set a PTE and flush it out
339 */
340 .align 5
341ENTRY(cpu_mohawk_set_pte_ext)
342 armv3_set_pte_ext
343 mov r0, r0
344 mcr p15, 0, r0, c7, c10, 1 @ clean D entry
345 mcr p15, 0, r0, c7, c10, 4 @ drain WB
346 mov pc, lr
347
348.globl cpu_mohawk_suspend_size
349.equ cpu_mohawk_suspend_size, 4 * 6
350#ifdef CONFIG_PM_SLEEP
351ENTRY(cpu_mohawk_do_suspend)
352 stmfd sp!, {r4 - r9, lr}
353 mrc p14, 0, r4, c6, c0, 0 @ clock configuration, for turbo mode
354 mrc p15, 0, r5, c15, c1, 0 @ CP access reg
355 mrc p15, 0, r6, c13, c0, 0 @ PID
356 mrc p15, 0, r7, c3, c0, 0 @ domain ID
357 mrc p15, 0, r8, c1, c0, 1 @ auxiliary control reg
358 mrc p15, 0, r9, c1, c0, 0 @ control reg
359 bic r4, r4, #2 @ clear frequency change bit
360 stmia r0, {r4 - r9} @ store cp regs
361 ldmia sp!, {r4 - r9, pc}
362ENDPROC(cpu_mohawk_do_suspend)
363
364ENTRY(cpu_mohawk_do_resume)
365 ldmia r0, {r4 - r9} @ load cp regs
366 mov ip, #0
367 mcr p15, 0, ip, c7, c7, 0 @ invalidate I & D caches, BTB
368 mcr p15, 0, ip, c7, c10, 4 @ drain write (&fill) buffer
369 mcr p15, 0, ip, c7, c5, 4 @ flush prefetch buffer
370 mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
371 mcr p14, 0, r4, c6, c0, 0 @ clock configuration, turbo mode.
372 mcr p15, 0, r5, c15, c1, 0 @ CP access reg
373 mcr p15, 0, r6, c13, c0, 0 @ PID
374 mcr p15, 0, r7, c3, c0, 0 @ domain ID
375 orr r1, r1, #0x18 @ cache the page table in L2
376 mcr p15, 0, r1, c2, c0, 0 @ translation table base addr
377 mcr p15, 0, r8, c1, c0, 1 @ auxiliary control reg
378 mov r0, r9 @ control register
379 b cpu_resume_mmu
380ENDPROC(cpu_mohawk_do_resume)
381#endif
382
383 __CPUINIT
384
385 .type __mohawk_setup, #function
386__mohawk_setup:
387 mov r0, #0
388 mcr p15, 0, r0, c7, c7 @ invalidate I,D caches
389 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
390 mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs
391 orr r4, r4, #0x18 @ cache the page table in L2
392 mcr p15, 0, r4, c2, c0, 0 @ load page table pointer
393
394 mov r0, #0 @ don't allow CP access
395 mcr p15, 0, r0, c15, c1, 0 @ write CP access register
396
397 adr r5, mohawk_crval
398 ldmia r5, {r5, r6}
399 mrc p15, 0, r0, c1, c0 @ get control register
400 bic r0, r0, r5
401 orr r0, r0, r6
402 mov pc, lr
403
404 .size __mohawk_setup, . - __mohawk_setup
405
406 /*
407 * R
408 * .RVI ZFRS BLDP WCAM
409 * .011 1001 ..00 0101
410 *
411 */
412 .type mohawk_crval, #object
413mohawk_crval:
414 crval clear=0x00007f3f, mmuset=0x00003905, ucset=0x00001134
415
416 __INITDATA
417
418 @ define struct processor (see <asm/proc-fns.h> and proc-macros.S)
419 define_processor_functions mohawk, dabort=v5t_early_abort, pabort=legacy_pabort
420
421 .section ".rodata"
422
423 string cpu_arch_name, "armv5te"
424 string cpu_elf_name, "v5"
425 string cpu_mohawk_name, "Marvell 88SV331x"
426
427 .align
428
429 .section ".proc.info.init", #alloc, #execinstr
430
431 .type __88sv331x_proc_info,#object
432__88sv331x_proc_info:
433 .long 0x56158000 @ Marvell 88SV331x (MOHAWK)
434 .long 0xfffff000
435 .long PMD_TYPE_SECT | \
436 PMD_SECT_BUFFERABLE | \
437 PMD_SECT_CACHEABLE | \
438 PMD_BIT4 | \
439 PMD_SECT_AP_WRITE | \
440 PMD_SECT_AP_READ
441 .long PMD_TYPE_SECT | \
442 PMD_BIT4 | \
443 PMD_SECT_AP_WRITE | \
444 PMD_SECT_AP_READ
445 b __mohawk_setup
446 .long cpu_arch_name
447 .long cpu_elf_name
448 .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP
449 .long cpu_mohawk_name
450 .long mohawk_processor_functions
451 .long v4wbi_tlb_fns
452 .long v4wb_user_fns
453 .long mohawk_cache_fns
454 .size __88sv331x_proc_info, . - __88sv331x_proc_info