1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Enter and leave deep sleep state on MPC83xx
4 *
5 * Copyright (c) 2006-2008 Freescale Semiconductor, Inc.
6 * Author: Scott Wood <scottwood@freescale.com>
7 */
8
9#include <asm/page.h>
10#include <asm/ppc_asm.h>
11#include <asm/reg.h>
12#include <asm/asm-offsets.h>
13
14#define SS_MEMSAVE 0x00 /* First 8 bytes of RAM */
15#define SS_HID 0x08 /* 3 HIDs */
16#define SS_IABR 0x14 /* 2 IABRs */
17#define SS_IBCR 0x1c
18#define SS_DABR 0x20 /* 2 DABRs */
19#define SS_DBCR 0x28
20#define SS_SP 0x2c
21#define SS_SR 0x30 /* 16 segment registers */
22#define SS_R2 0x70
23#define SS_MSR 0x74
24#define SS_SDR1 0x78
25#define SS_LR 0x7c
26#define SS_SPRG 0x80 /* 8 SPRGs */
27#define SS_DBAT 0xa0 /* 8 DBATs */
28#define SS_IBAT 0xe0 /* 8 IBATs */
29#define SS_TB 0x120
30#define SS_CR 0x128
31#define SS_GPREG 0x12c /* r12-r31 */
32#define STATE_SAVE_SIZE 0x17c
33
34 .section .data
35 .align 5
36
37mpc83xx_sleep_save_area:
38 .space STATE_SAVE_SIZE
39immrbase:
40 .long 0
41
42 .section .text
43 .align 5
44
45 /* r3 = physical address of IMMR */
46_GLOBAL(mpc83xx_enter_deep_sleep)
47 lis r4, immrbase@ha
48 stw r3, immrbase@l(r4)
49
50 /* The first 2 words of memory are used to communicate with the
51 * bootloader, to tell it how to resume.
52 *
53 * The first word is the magic number 0xf5153ae5, and the second
54 * is the pointer to mpc83xx_deep_resume.
55 *
56 * The original content of these two words is saved in SS_MEMSAVE.
57 */
58
59 lis r3, mpc83xx_sleep_save_area@h
60 ori r3, r3, mpc83xx_sleep_save_area@l
61
62 lis r4, KERNELBASE@h
63 lwz r5, 0(r4)
64 lwz r6, 4(r4)
65
66 stw r5, SS_MEMSAVE+0(r3)
67 stw r6, SS_MEMSAVE+4(r3)
68
69 mfspr r5, SPRN_HID0
70 mfspr r6, SPRN_HID1
71 /* FIXME: Should this use SPRN_HID2_G2_LE? */
72 mfspr r7, SPRN_HID2_750FX
73
74 stw r5, SS_HID+0(r3)
75 stw r6, SS_HID+4(r3)
76 stw r7, SS_HID+8(r3)
77
78 mfspr r4, SPRN_IABR
79 mfspr r5, SPRN_IABR2
80 mfspr r6, SPRN_IBCR
81 mfspr r7, SPRN_DABR
82 mfspr r8, SPRN_DABR2
83 mfspr r9, SPRN_DBCR
84
85 stw r4, SS_IABR+0(r3)
86 stw r5, SS_IABR+4(r3)
87 stw r6, SS_IBCR(r3)
88 stw r7, SS_DABR+0(r3)
89 stw r8, SS_DABR+4(r3)
90 stw r9, SS_DBCR(r3)
91
92 mfspr r4, SPRN_SPRG0
93 mfspr r5, SPRN_SPRG1
94 mfspr r6, SPRN_SPRG2
95 mfspr r7, SPRN_SPRG3
96 mfsdr1 r8
97
98 stw r4, SS_SPRG+0(r3)
99 stw r5, SS_SPRG+4(r3)
100 stw r6, SS_SPRG+8(r3)
101 stw r7, SS_SPRG+12(r3)
102 stw r8, SS_SDR1(r3)
103
104 mfspr r4, SPRN_SPRG4
105 mfspr r5, SPRN_SPRG5
106 mfspr r6, SPRN_SPRG6
107 mfspr r7, SPRN_SPRG7
108
109 stw r4, SS_SPRG+16(r3)
110 stw r5, SS_SPRG+20(r3)
111 stw r6, SS_SPRG+24(r3)
112 stw r7, SS_SPRG+28(r3)
113
114 mfspr r4, SPRN_DBAT0U
115 mfspr r5, SPRN_DBAT0L
116 mfspr r6, SPRN_DBAT1U
117 mfspr r7, SPRN_DBAT1L
118
119 stw r4, SS_DBAT+0x00(r3)
120 stw r5, SS_DBAT+0x04(r3)
121 stw r6, SS_DBAT+0x08(r3)
122 stw r7, SS_DBAT+0x0c(r3)
123
124 mfspr r4, SPRN_DBAT2U
125 mfspr r5, SPRN_DBAT2L
126 mfspr r6, SPRN_DBAT3U
127 mfspr r7, SPRN_DBAT3L
128
129 stw r4, SS_DBAT+0x10(r3)
130 stw r5, SS_DBAT+0x14(r3)
131 stw r6, SS_DBAT+0x18(r3)
132 stw r7, SS_DBAT+0x1c(r3)
133
134 mfspr r4, SPRN_DBAT4U
135 mfspr r5, SPRN_DBAT4L
136 mfspr r6, SPRN_DBAT5U
137 mfspr r7, SPRN_DBAT5L
138
139 stw r4, SS_DBAT+0x20(r3)
140 stw r5, SS_DBAT+0x24(r3)
141 stw r6, SS_DBAT+0x28(r3)
142 stw r7, SS_DBAT+0x2c(r3)
143
144 mfspr r4, SPRN_DBAT6U
145 mfspr r5, SPRN_DBAT6L
146 mfspr r6, SPRN_DBAT7U
147 mfspr r7, SPRN_DBAT7L
148
149 stw r4, SS_DBAT+0x30(r3)
150 stw r5, SS_DBAT+0x34(r3)
151 stw r6, SS_DBAT+0x38(r3)
152 stw r7, SS_DBAT+0x3c(r3)
153
154 mfspr r4, SPRN_IBAT0U
155 mfspr r5, SPRN_IBAT0L
156 mfspr r6, SPRN_IBAT1U
157 mfspr r7, SPRN_IBAT1L
158
159 stw r4, SS_IBAT+0x00(r3)
160 stw r5, SS_IBAT+0x04(r3)
161 stw r6, SS_IBAT+0x08(r3)
162 stw r7, SS_IBAT+0x0c(r3)
163
164 mfspr r4, SPRN_IBAT2U
165 mfspr r5, SPRN_IBAT2L
166 mfspr r6, SPRN_IBAT3U
167 mfspr r7, SPRN_IBAT3L
168
169 stw r4, SS_IBAT+0x10(r3)
170 stw r5, SS_IBAT+0x14(r3)
171 stw r6, SS_IBAT+0x18(r3)
172 stw r7, SS_IBAT+0x1c(r3)
173
174 mfspr r4, SPRN_IBAT4U
175 mfspr r5, SPRN_IBAT4L
176 mfspr r6, SPRN_IBAT5U
177 mfspr r7, SPRN_IBAT5L
178
179 stw r4, SS_IBAT+0x20(r3)
180 stw r5, SS_IBAT+0x24(r3)
181 stw r6, SS_IBAT+0x28(r3)
182 stw r7, SS_IBAT+0x2c(r3)
183
184 mfspr r4, SPRN_IBAT6U
185 mfspr r5, SPRN_IBAT6L
186 mfspr r6, SPRN_IBAT7U
187 mfspr r7, SPRN_IBAT7L
188
189 stw r4, SS_IBAT+0x30(r3)
190 stw r5, SS_IBAT+0x34(r3)
191 stw r6, SS_IBAT+0x38(r3)
192 stw r7, SS_IBAT+0x3c(r3)
193
194 mfmsr r4
195 mflr r5
196 mfcr r6
197
198 stw r4, SS_MSR(r3)
199 stw r5, SS_LR(r3)
200 stw r6, SS_CR(r3)
201 stw r1, SS_SP(r3)
202 stw r2, SS_R2(r3)
203
2041: mftbu r4
205 mftb r5
206 mftbu r6
207 cmpw r4, r6
208 bne 1b
209
210 stw r4, SS_TB+0(r3)
211 stw r5, SS_TB+4(r3)
212
213 stmw r12, SS_GPREG(r3)
214
215 li r4, 0
216 addi r6, r3, SS_SR-4
2171: mfsrin r5, r4
218 stwu r5, 4(r6)
219 addis r4, r4, 0x1000
220 cmpwi r4, 0
221 bne 1b
222
223 /* Disable machine checks and critical exceptions */
224 mfmsr r4
225 rlwinm r4, r4, 0, ~MSR_CE
226 rlwinm r4, r4, 0, ~MSR_ME
227 mtmsr r4
228 isync
229
230#define TMP_VIRT_IMMR 0xf0000000
231#define DEFAULT_IMMR_VALUE 0xff400000
232#define IMMRBAR_BASE 0x0000
233
234 lis r4, immrbase@ha
235 lwz r4, immrbase@l(r4)
236
237 /* Use DBAT0 to address the current IMMR space */
238
239 ori r4, r4, 0x002a
240 mtspr SPRN_DBAT0L, r4
241 lis r8, TMP_VIRT_IMMR@h
242 ori r4, r8, 0x001e /* 1 MByte accessible from Kernel Space only */
243 mtspr SPRN_DBAT0U, r4
244 isync
245
246 /* Use DBAT1 to address the original IMMR space */
247
248 lis r4, DEFAULT_IMMR_VALUE@h
249 ori r4, r4, 0x002a
250 mtspr SPRN_DBAT1L, r4
251 lis r9, (TMP_VIRT_IMMR + 0x01000000)@h
252 ori r4, r9, 0x001e /* 1 MByte accessible from Kernel Space only */
253 mtspr SPRN_DBAT1U, r4
254 isync
255
256 /* Use DBAT2 to address the beginning of RAM. This isn't done
257 * using the normal virtual mapping, because with page debugging
258 * enabled it will be read-only.
259 */
260
261 li r4, 0x0002
262 mtspr SPRN_DBAT2L, r4
263 lis r4, KERNELBASE@h
264 ori r4, r4, 0x001e /* 1 MByte accessible from Kernel Space only */
265 mtspr SPRN_DBAT2U, r4
266 isync
267
268 /* Flush the cache with our BAT, as there will be TLB misses
269 * otherwise if page debugging is enabled, and these misses
270 * will disturb the PLRU algorithm.
271 */
272
273 bl __flush_disable_L1
274
275 /* Keep the i-cache enabled, so the hack below for low-boot
276 * flash will work.
277 */
278 mfspr r3, SPRN_HID0
279 ori r3, r3, HID0_ICE
280 mtspr SPRN_HID0, r3
281 isync
282
283 lis r6, 0xf515
284 ori r6, r6, 0x3ae5
285
286 lis r7, mpc83xx_deep_resume@h
287 ori r7, r7, mpc83xx_deep_resume@l
288 tophys(r7, r7)
289
290 lis r5, KERNELBASE@h
291 stw r6, 0(r5)
292 stw r7, 4(r5)
293
294 /* Reset BARs */
295
296 li r4, 0
297 stw r4, 0x0024(r8)
298 stw r4, 0x002c(r8)
299 stw r4, 0x0034(r8)
300 stw r4, 0x003c(r8)
301 stw r4, 0x0064(r8)
302 stw r4, 0x006c(r8)
303
304 /* Rev 1 of the 8313 has problems with wakeup events that are
305 * pending during the transition to deep sleep state (such as if
306 * the PCI host sets the state to D3 and then D0 in rapid
307 * succession). This check shrinks the race window somewhat.
308 *
309 * See erratum PCI23, though the problem is not limited
310 * to PCI.
311 */
312
313 lwz r3, 0x0b04(r8)
314 andi. r3, r3, 1
315 bne- mpc83xx_deep_resume
316
317 /* Move IMMR back to the default location, following the
318 * procedure specified in the MPC8313 manual.
319 */
320 lwz r4, IMMRBAR_BASE(r8)
321 isync
322 lis r4, DEFAULT_IMMR_VALUE@h
323 stw r4, IMMRBAR_BASE(r8)
324 lis r4, KERNELBASE@h
325 lwz r4, 0(r4)
326 isync
327 lwz r4, IMMRBAR_BASE(r9)
328 mr r8, r9
329 isync
330
331 /* Check the Reset Configuration Word to see whether flash needs
332 * to be mapped at a low address or a high address.
333 */
334
335 lwz r4, 0x0904(r8)
336 andis. r4, r4, 0x0400
337 li r4, 0
338 beq boot_low
339 lis r4, 0xff80
340boot_low:
341 stw r4, 0x0020(r8)
342 lis r7, 0x8000
343 ori r7, r7, 0x0016
344
345 mfspr r5, SPRN_HID0
346 rlwinm r5, r5, 0, ~(HID0_DOZE | HID0_NAP)
347 oris r5, r5, HID0_SLEEP@h
348 mtspr SPRN_HID0, r5
349 isync
350
351 mfmsr r5
352 oris r5, r5, MSR_POW@h
353
354 /* Enable the flash mapping at the appropriate address. This
355 * mapping will override the RAM mapping if booting low, so there's
356 * no need to disable the latter. This must be done inside the same
357 * cache line as setting MSR_POW, so that no instruction fetches
358 * from RAM happen after the flash mapping is turned on.
359 */
360
361 .align 5
362 stw r7, 0x0024(r8)
363 sync
364 isync
365 mtmsr r5
366 isync
3671: b 1b
368
369mpc83xx_deep_resume:
370 lis r4, 1f@h
371 ori r4, r4, 1f@l
372 tophys(r4, r4)
373 mtsrr0 r4
374
375 mfmsr r4
376 rlwinm r4, r4, 0, ~(MSR_IR | MSR_DR)
377 mtsrr1 r4
378
379 rfi
380
3811: tlbia
382 bl __inval_enable_L1
383
384 lis r3, mpc83xx_sleep_save_area@h
385 ori r3, r3, mpc83xx_sleep_save_area@l
386 tophys(r3, r3)
387
388 lwz r5, SS_MEMSAVE+0(r3)
389 lwz r6, SS_MEMSAVE+4(r3)
390
391 stw r5, 0(0)
392 stw r6, 4(0)
393
394 lwz r5, SS_HID+0(r3)
395 lwz r6, SS_HID+4(r3)
396 lwz r7, SS_HID+8(r3)
397
398 mtspr SPRN_HID0, r5
399 mtspr SPRN_HID1, r6
400 /* FIXME: Should this use SPRN_HID2_G2_LE? */
401 mtspr SPRN_HID2_750FX, r7
402
403 lwz r4, SS_IABR+0(r3)
404 lwz r5, SS_IABR+4(r3)
405 lwz r6, SS_IBCR(r3)
406 lwz r7, SS_DABR+0(r3)
407 lwz r8, SS_DABR+4(r3)
408 lwz r9, SS_DBCR(r3)
409
410 mtspr SPRN_IABR, r4
411 mtspr SPRN_IABR2, r5
412 mtspr SPRN_IBCR, r6
413 mtspr SPRN_DABR, r7
414 mtspr SPRN_DABR2, r8
415 mtspr SPRN_DBCR, r9
416
417 li r4, 0
418 addi r6, r3, SS_SR-4
4191: lwzu r5, 4(r6)
420 mtsrin r5, r4
421 addis r4, r4, 0x1000
422 cmpwi r4, 0
423 bne 1b
424
425 lwz r4, SS_DBAT+0x00(r3)
426 lwz r5, SS_DBAT+0x04(r3)
427 lwz r6, SS_DBAT+0x08(r3)
428 lwz r7, SS_DBAT+0x0c(r3)
429
430 mtspr SPRN_DBAT0U, r4
431 mtspr SPRN_DBAT0L, r5
432 mtspr SPRN_DBAT1U, r6
433 mtspr SPRN_DBAT1L, r7
434
435 lwz r4, SS_DBAT+0x10(r3)
436 lwz r5, SS_DBAT+0x14(r3)
437 lwz r6, SS_DBAT+0x18(r3)
438 lwz r7, SS_DBAT+0x1c(r3)
439
440 mtspr SPRN_DBAT2U, r4
441 mtspr SPRN_DBAT2L, r5
442 mtspr SPRN_DBAT3U, r6
443 mtspr SPRN_DBAT3L, r7
444
445 lwz r4, SS_DBAT+0x20(r3)
446 lwz r5, SS_DBAT+0x24(r3)
447 lwz r6, SS_DBAT+0x28(r3)
448 lwz r7, SS_DBAT+0x2c(r3)
449
450 mtspr SPRN_DBAT4U, r4
451 mtspr SPRN_DBAT4L, r5
452 mtspr SPRN_DBAT5U, r6
453 mtspr SPRN_DBAT5L, r7
454
455 lwz r4, SS_DBAT+0x30(r3)
456 lwz r5, SS_DBAT+0x34(r3)
457 lwz r6, SS_DBAT+0x38(r3)
458 lwz r7, SS_DBAT+0x3c(r3)
459
460 mtspr SPRN_DBAT6U, r4
461 mtspr SPRN_DBAT6L, r5
462 mtspr SPRN_DBAT7U, r6
463 mtspr SPRN_DBAT7L, r7
464
465 lwz r4, SS_IBAT+0x00(r3)
466 lwz r5, SS_IBAT+0x04(r3)
467 lwz r6, SS_IBAT+0x08(r3)
468 lwz r7, SS_IBAT+0x0c(r3)
469
470 mtspr SPRN_IBAT0U, r4
471 mtspr SPRN_IBAT0L, r5
472 mtspr SPRN_IBAT1U, r6
473 mtspr SPRN_IBAT1L, r7
474
475 lwz r4, SS_IBAT+0x10(r3)
476 lwz r5, SS_IBAT+0x14(r3)
477 lwz r6, SS_IBAT+0x18(r3)
478 lwz r7, SS_IBAT+0x1c(r3)
479
480 mtspr SPRN_IBAT2U, r4
481 mtspr SPRN_IBAT2L, r5
482 mtspr SPRN_IBAT3U, r6
483 mtspr SPRN_IBAT3L, r7
484
485 lwz r4, SS_IBAT+0x20(r3)
486 lwz r5, SS_IBAT+0x24(r3)
487 lwz r6, SS_IBAT+0x28(r3)
488 lwz r7, SS_IBAT+0x2c(r3)
489
490 mtspr SPRN_IBAT4U, r4
491 mtspr SPRN_IBAT4L, r5
492 mtspr SPRN_IBAT5U, r6
493 mtspr SPRN_IBAT5L, r7
494
495 lwz r4, SS_IBAT+0x30(r3)
496 lwz r5, SS_IBAT+0x34(r3)
497 lwz r6, SS_IBAT+0x38(r3)
498 lwz r7, SS_IBAT+0x3c(r3)
499
500 mtspr SPRN_IBAT6U, r4
501 mtspr SPRN_IBAT6L, r5
502 mtspr SPRN_IBAT7U, r6
503 mtspr SPRN_IBAT7L, r7
504
505 lwz r4, SS_SPRG+16(r3)
506 lwz r5, SS_SPRG+20(r3)
507 lwz r6, SS_SPRG+24(r3)
508 lwz r7, SS_SPRG+28(r3)
509
510 mtspr SPRN_SPRG4, r4
511 mtspr SPRN_SPRG5, r5
512 mtspr SPRN_SPRG6, r6
513 mtspr SPRN_SPRG7, r7
514
515 lwz r4, SS_SPRG+0(r3)
516 lwz r5, SS_SPRG+4(r3)
517 lwz r6, SS_SPRG+8(r3)
518 lwz r7, SS_SPRG+12(r3)
519 lwz r8, SS_SDR1(r3)
520
521 mtspr SPRN_SPRG0, r4
522 mtspr SPRN_SPRG1, r5
523 mtspr SPRN_SPRG2, r6
524 mtspr SPRN_SPRG3, r7
525 mtsdr1 r8
526
527 lwz r4, SS_MSR(r3)
528 lwz r5, SS_LR(r3)
529 lwz r6, SS_CR(r3)
530 lwz r1, SS_SP(r3)
531 lwz r2, SS_R2(r3)
532
533 mtsrr1 r4
534 mtsrr0 r5
535 mtcr r6
536
537 li r4, 0
538 mtspr SPRN_TBWL, r4
539
540 lwz r4, SS_TB+0(r3)
541 lwz r5, SS_TB+4(r3)
542
543 mtspr SPRN_TBWU, r4
544 mtspr SPRN_TBWL, r5
545
546 lmw r12, SS_GPREG(r3)
547
548 /* Kick decrementer */
549 li r0, 1
550 mtdec r0
551
552 rfi
553_ASM_NOKPROBE_SYMBOL(mpc83xx_deep_resume)
554

source code of linux/arch/powerpc/platforms/83xx/suspend-asm.S