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[people/ms/u-boot.git] / board / eltec / elppc / asm_init.S
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c609719b
WD		 1/*
2 * (C) Copyright 2001 ELTEC Elektronik AG
3 * Frank Gottschling <fgottschling@eltec.de>
4 *
5 * ELTEC ELPPC RAM initialization
6 *
7 * See file CREDITS for list of people who contributed to this
8 * project.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation; either version 2 of
13 * the License, or (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
23 * MA 02111-1307 USA
24 */
25
26#include <config.h>
700a0c64 27#include <asm/processor.h>
c609719b
WD		 28#include <version.h>
29#include <mpc106.h>
30
31#include <ppc_asm.tmpl>
32#include <ppc_defs.h>
33
34.globl board_asm_init
35board_asm_init:
36
37/*
38 * setup pointer to message block
39 */
40 mflr r13 /* save away link register */
41 bl get_lnk_reg /* r3=addr of next instruction */
42 subi r4, r3, 8 /* r4=board_asm_init addr */
43 addi r29, r4, (MessageBlock-board_asm_init)
44
45/*
46 * dcache_disable
47 */
48 mfspr r3, HID0
49 li r4, HID0_DCE
50 andc r3, r3, r4
51 mr r2, r3
52 ori r3, r3, HID0_DCI
53 sync
54 mtspr HID0, r3
55 mtspr HID0, r2
56 isync
57 sync
58/*
59 * icache_disable
60 */
61 mfspr r3, HID0
62 li r4, 0
63 ori r4, r4, HID0_ICE
64 andc r3, r3, r4
65 sync
66 mtspr HID0, r3
67/*
68 * invalidate caches
69 */
70 ori r3, r3, (HID0_ICE | HID0_ICFI | HID0_DCI | HID0_DCE)
71 or r4, r4, r3
72 isync
73 mtspr HID0, r4
74 andc r4, r4, r3
75 isync
76 mtspr HID0, r4
77 isync
78/*
79 * icache_enable
80 */
81 mfspr r3, HID0
82 ori r3, r3, (HID0_ICE | HID0_ICFI)
83 sync
84 mtspr HID0, r3
85
86
87/*
88 * setup memory controller
89 */
90 lis r1, MPC106_REG_ADDR@h
91 ori r1, r1, MPC106_REG_ADDR@l
92 lis r2, MPC106_REG_DATA@h
93 ori r2, r2, MPC106_REG_DATA@l
94
95 /* Configure PICR1 */
96 lis r3, MPC106_REG@h
97 ori r3, r3, PCI_PICR1
98 stwbrx r3, 0, r1
99 addis r3, r0, 0xFF14
100 ori r3, r3, 0x1CC8
101 eieio
102 stwbrx r3, 0, r2
103
104 /* Configure PICR2 */
105 lis r3, MPC106_REG@h
106 ori r3, r3, PCI_PICR2
107 stwbrx r3, 0, r1
108 addis r3, r0, 0x0000
109 ori r3, r3, 0x0000
110 eieio
111 stwbrx r3, 0, r2
112
113 /* Configure EUMBAR */
114 lis r3, MPC106_REG@h
115 ori r3, r3, 0x0078 /* offest of EUMBAR in PCI config space */
116 stwbrx r3, 0, r1
117 lis r3, MPC107_EUMB_ADDR@h
118 eieio
119 stwbrx r3, 0, r2
120
121 /* Configure Address Map B Option Reg */
122 lis r3, MPC106_REG@h
123 ori r3, r3, 0x00e0 /* offest of AMBOR in PCI config space */
124 stwbrx r3, 0, r1
125 lis r3, 0
126 eieio
127 stwbrx r3, 0, r2
128
129 /* Configure I2C Controller */
130 lis r14, MPC107_I2C_ADDR@h /* base of I2C controller */
131 ori r14, r14, MPC107_I2C_ADDR@l
132 lis r3, 0x2b10 /* I2C clock = 100MHz/1024 */
133 stw r3, 4(r14)
134 li r3, 0 /* clear arbitration */
135 eieio
136 stw r3, 12(r14)
137
138 /* Configure MCCR1 */
139 lis r3, MPC106_REG@h
140 ori r3, r3, MPC106_MCCR1
141 stwbrx r3, 0, r1
142 addis r3, r0, 0x0660 /* don't set MEMGO now ! */
143 ori r3, r3, 0x0000
144 eieio
145 stwbrx r3, 0, r2
146
147 /* Configure MCCR2 */
148 lis r3, MPC106_REG@h
149 ori r3, r3, MPC106_MCCR2
150 stwbrx r3, 0, r1
151 addis r3, r0, 0x0400
152 ori r3, r3, 0x1800
153 eieio
154 stwbrx r3, 0, r2
155
156
157 /* Configure MCCR3 */
158 lis r3, MPC106_REG@h
159 ori r3, r3, MPC106_MCCR3
160 stwbrx r3, 0, r1
161 addis r3, r0, 0x0230
162 ori r3, r3, 0x0000
163 eieio
164 stwbrx r3, 0, r2
165
166 /* Configure MCCR4 */
167 lis r3, MPC106_REG@h
168 ori r3, r3, MPC106_MCCR4
169 stwbrx r3, 0, r1
170 addis r3, r0, 0x2532
171 ori r3, r3, 0x2220
172 eieio
173 stwbrx r3, 0, r2
174
175/*
176 * configure memory interface (MICRs)
177 */
178 addis r3, r0, 0x8000 /* ADDR_80 */
179 ori r3, r3, 0x0080 /* SMEMADD1 */
180 stwbrx r3, 0, r1
181 addis r3, r0, 0xFFFF
182 ori r3, r3, 0x4000
183 eieio
184 stwbrx r3, 0, r2
185
186 addis r3, r0, 0x8000 /* ADDR_84 */
187 ori r3, r3, 0x0084 /* SMEMADD2 */
188 stwbrx r3, 0, r1
189 addis r3, r0, 0xFFFF
190 ori r3, r3, 0xFFFF
191 eieio
192 stwbrx r3, 0, r2
193
194 addis r3, r0, 0x8000 /* ADDR_88 */
195 ori r3, r3, 0x0088 /* EXTSMEM1 */
196 stwbrx r3, 0, r1
197 addis r3, r0, 0x0303
198 ori r3, r3, 0x0000
199 eieio
200 stwbrx r3, 0, r2
201
202 addis r3, r0, 0x8000 /* ADDR_8C */
203 ori r3, r3, 0x008c /* EXTSMEM2 */
204 stwbrx r3, 0, r1
205 addis r3, r0, 0x0303
206 ori r3, r3, 0x0303
207 eieio
208 stwbrx r3, 0, r2
209
210 addis r3, r0, 0x8000 /* ADDR_90 */
211 ori r3, r3, 0x0090 /* EMEMADD1 */
212 stwbrx r3, 0, r1
213 addis r3, r0, 0xFFFF
214 ori r3, r3, 0x7F3F
215 eieio
216 stwbrx r3, 0, r2
217
218 addis r3, r0, 0x8000 /* ADDR_94 */
219 ori r3, r3, 0x0094 /* EMEMADD2 */
220 stwbrx r3, 0, r1
221 addis r3, r0, 0xFFFF
222 ori r3, r3, 0xFFFF
223 eieio
224 stwbrx r3, 0, r2
225
226 addis r3, r0, 0x8000 /* ADDR_98 */
227 ori r3, r3, 0x0098 /* EXTEMEM1 */
228 stwbrx r3, 0, r1
229 addis r3, r0, 0x0303
230 ori r3, r3, 0x0000
231 eieio
232 stwbrx r3, 0, r2
233
234 addis r3, r0, 0x8000 /* ADDR_9C */
235 ori r3, r3, 0x009c /* EXTEMEM2 */
236 stwbrx r3, 0, r1
237 addis r3, r0, 0x0303
238 ori r3, r3, 0x0303
239 eieio
240 stwbrx r3, 0, r2
241
242 addis r3, r0, 0x8000 /* ADDR_A0 */
243 ori r3, r3, 0x00a0 /* MEMBNKEN */
244 stwbrx r3, 0, r1
245 addis r3, r0, 0x0000
246 ori r3, r3, 0x0003
247 eieio
248 stwbrx r3, 0, r2
249
250/*
251 * must wait at least 100us after HRESET to issue a MEMGO
252 */
253 lis r0, 1
254 mtctr r0
255memStartWait:
256 bdnz memStartWait
257
258/*
259 * enable RAM Operations through MCCR1 (MEMGO)
260 */
261 lis r3, 0x8000
262 ori r3, r3, 0x00f0
263 stwbrx r3, r0, r1
264 sync
265 lwbrx r3, 0, r2
266 lis r0, 0x0008
267 or r3, r0, r3
268 stwbrx r3, 0, r2
269 sync
270
271/*
272 * set LEDs first time
273 */
274 li r3, 0x1
6d0f6bcf 275 lis r30, CONFIG_SYS_USR_LED_BASE@h
c609719b
WD		 276 stb r3, 2(r30)
277 sync
278
279/*
280 * init COM1 for polled output
281 */
6d0f6bcf
JCPV		 282 lis r8, CONFIG_SYS_NS16550_COM1@h /* COM1 base address*/
283 ori r8, r8, CONFIG_SYS_NS16550_COM1@l
c609719b
WD		 284 li r9, 0x00
285 stb r9, 1(r8) /* int disabled */
286 eieio
287 li r9, 0x00
288 stb r9, 4(r8) /* modem ctrl */
289 eieio
290 li r9, 0x80
291 stb r9, 3(r8) /* link ctrl */
292 eieio
6d0f6bcf 293 li r9, (CONFIG_SYS_NS16550_CLK / 16 / CONFIG_BAUDRATE)
c609719b
WD		 294 stb r9, 0(r8) /* baud rate (LSB)*/
295 eieio
6d0f6bcf 296 li r9, ((CONFIG_SYS_NS16550_CLK / 16 / CONFIG_BAUDRATE) >> 8)
c609719b
WD		 297 stb r9, 1(r8) /* baud rate (MSB) */
298 eieio
299 li r9, 0x07
300 stb r9, 3(r8) /* 8 data bits, 2 stop bit, no parity */
301 eieio
302 li r9, 0x0b
303 stb r9, 4(r8) /* enable the receiver and transmitter (modem ctrl) */
304 eieio
305waitEmpty:
306 lbz r9, 5(r8) /* transmit empty */
307 andi. r9, r9, 0x40
308 beq waitEmpty
309 li r9, 0x47
310 stb r9, 3(r8) /* send break, 8 data bits, 2 stop bit, no parity */
311 eieio
312
313 lis r0, 0x0001
314 mtctr r0
315waitCOM1:
316 lwz r0, 5(r8) /* load from port for delay */
317 bdnz waitCOM1
318
319waitEmpty1:
320 lbz r9, 5(r8) /* transmit empty */
321 andi. r9, r9, 0x40
322 beq waitEmpty1
323 li r9, 0x07
324 stb r9, 3(r8) /* 8 data bits, 2 stop bit, no parity */
325 eieio
326
327/*
328 * intro message from message block
329 */
330 addi r3, r29, (MnewLine-MessageBlock)
331 bl Printf
332 addi r3, r29, (MinitLogo-MessageBlock)
333 bl Printf
334
335/*
336 * memory cofiguration using SPD information stored on the SODIMMs
337 */
338 addi r3, r29, (Mspd01-MessageBlock)
339 bl Printf
340
341 li r17, 0
342
343 li r3, 0x0002 /* get RAM type from spd for bank0/1 */
344 bl spdRead
345
346 cmpi 0, 0, r3, -1 /* error ? */
347 bne noSpdError
348
349 addi r3, r29, (Mfail-MessageBlock)
350 bl Printf
351
352 li r6, 0xe /* error codes in r6 and r7 */
353 li r7, 0x0
354 b toggleError /* fail - loop forever */
355
356noSpdError:
357 mr r15, r3 /* save r3 */
358
359 addi r3, r29, (Mok-MessageBlock)
360 bl Printf
361
362 cmpli 0, 0, r15, 0x0004 /* SDRAM ? */
363 beq isSDRAM
364
365 addi r3, r29, (MramTyp-MessageBlock)
366 bl Printf
367
368 li r6, 0xd /* error codes in r6 and r7 */
369 li r7, 0x0
370 b toggleError /* fail - loop forever */
371
372isSDRAM:
373 li r3, 0x0012 /* get supported CAS latencies from byte 18 */
374 bl spdRead
375 mr r15, r3
376 li r3, 0x09
377 andi. r0, r15, 0x04
378 bne maxCLis3
379 li r3, 0x17
380maxCLis3:
381 andi. r0, r15, 0x02
382 bne CL2
383
384 addi r3, r29, (MramTyp-MessageBlock)
385 bl Printf
386
387 li r6, 0xc /* error codes in r6 and r7 */
388 li r7, 0x0
389 b toggleError /* fail - loop forever */
390CL2:
391 bl spdRead
392 cmpli 0, 0, r3, 0xa1 /* cycle time must be 10ns max. */
393 blt speedOk
394
395 addi r3, r29, (MramTyp-MessageBlock)
396 bl Printf
397
398 li r6, 0xb /* error codes in r6 and r7 */
399 li r7, 0x0
400 b toggleError /* fail - loop forever */
401speedOk:
402 lis r20, 0x06e8 /* preset MCR1 value */
403
404 li r3, 0x0011 /* get number of internal banks from spd for bank0/1 */
405 bl spdRead
406
407 cmpli 0, 0, r3, 0x02
408 beq SD_2B
409 cmpli 0, 0, r3, 0x04
410 beq SD_4B
411memConfErr:
412 addi r3, r29, (MramConfErr-MessageBlock)
413 bl Printf
414
415 li r6, 0xa /* error codes in r6 and r7 */
416 li r7, 0x0
417 b toggleError /* fail - loop forever */
418
419SD_2B:
420 li r3, 0x0003 /* get number of row bits from spd for bank0/1 */
421 bl spdRead
422 cmpli 0, 0, r3, 0x0b
423 beq row11x2
424 cmpli 0, 0, r3, 0x0c
425 beq row12x2or13x2
426 cmpli 0, 0, r3, 0x0d
427 beq row12x2or13x2
428 b memConfErr
429SD_4B:
430 li r3, 0x0003 /* get number of row bits from spd for bank0/1 */
431 bl spdRead
432 cmpli 0, 0, r3, 0x0b
433 beq row11x4or12x4
434 cmpli 0, 0, r3, 0x0c
435 beq row11x4or12x4
436 cmpli 0, 0, r3, 0x0d
437 beq row13x4
438 b memConfErr
439row12x2or13x2:
440 ori r20, r20, 0x05
441 b row11x4or12x4
442row13x4:
443 ori r20, r20, 0x0a
444 b row11x4or12x4
445row11x2:
446 ori r20, r20, 0x0f
447row11x4or12x4:
448 /* get the size of bank 0-1 */
449
450 li r3, 0x001f /* get bank size from spd for bank0/1 */
451 bl spdRead
452
453 rlwinm r16, r3, 2, 24, 29 /* calculate size in MByte (128 MB max.) */
454
455 li r3, 0x0005 /* get number of banks from spd for bank0/1 */
456 bl spdRead
457
458 cmpi 0, 0, r3, 2 /* 2 banks ? */
459 bne SDRAMnobank1
460
461 mr r17, r16
462
463SDRAMnobank1:
464 li r3, 0x000c /* get refresh from spd for bank0/1 */
465 bl spdRead
466 andi. r3, r3, 0x007f /* mask selfrefresh bit */
467 li r4, 0x1800 /* refesh cycle 1536 clocks left shifted 2 */
468 cmpli 0, 0, r3, 0x0000 /* 15.6 us ? */
469 beq writeRefresh
470
471 li r4, 0x0c00 /* refesh cycle 768 clocks left shifted 2 */
472 cmpli 0, 0, r3, 0x0002 /* 7.8 us ? */
473 beq writeRefresh
474
475 li r4, 0x3000 /* refesh cycle 3072 clocks left shifted 2 */
476 cmpli 0, 0, r3, 0x0003 /* 31.3 us ? */
477 beq writeRefresh
478
479 li r4, 0x6000 /* refesh cycle 6144 clocks left shifted 2 */
480 cmpli 0, 0, r3, 0x0004 /* 62.5 us ? */
481 beq writeRefresh
482
483 li r4, 0
484 ori r4, r4, 0xc000 /* refesh cycle 8224 clocks left shifted 2 */
485 cmpli 0, 0, r3, 0x0005 /* 125 us ? */
486 beq writeRefresh
487
488 b memConfErr
489
490writeRefresh:
491 lis r21, 0x0400 /* preset MCCR2 value */
492 or r21, r21, r4
493
494 /* Overwrite MCCR1 */
495 lis r3, MPC106_REG@h
496 ori r3, r3, MPC106_MCCR1
497 stwbrx r3, 0, r1
498 eieio
499 stwbrx r20, 0, r2
500
501 /* Overwrite MCCR2 */
502 lis r3, MPC106_REG@h
503 ori r3, r3, MPC106_MCCR2
504 stwbrx r3, 0, r1
505 eieio
506 stwbrx r21, 0, r2
507
508 /* set the memory boundary registers for bank 0-3 */
509 li r20, 0
510 lis r23, 0x0303
511 lis r24, 0x0303
512 subi r21, r16, 1 /* calculate end address bank0 */
513 li r22, 1
514
515 cmpi 0, 0, r17, 0 /* bank1 present ? */
516 beq nobank1
517
518 andi. r3, r16, 0x00ff /* calculate start address of bank1 */
519 andi. r4, r16, 0x0300
520 rlwinm r3, r3, 8, 16, 23
521 or r20, r20, r3
522 or r23, r23, r4
523
524 add r16, r16, r17 /* add to total memory size */
525
526 subi r3, r16, 1 /* calculate end address of bank1 */
527 andi. r4, r3, 0x0300
528 andi. r3, r3, 0x00ff
529 rlwinm r3, r3, 8, 16, 23
530 or r21, r21, r3
531 or r24, r24, r4
532
533 ori r22, r22, 2 /* enable bank1 */
534 b bankOk
535nobank1:
536 ori r23, r23, 0x0300 /* set bank1 start to unused area */
537 ori r24, r24, 0x0300 /* set bank1 end to unused area */
538bankOk:
539 addi r3, r29, (Mactivate-MessageBlock)
540 bl Printf
541 mr r3, r16
542 bl OutDec
543 addi r3, r29, (Mact0123e-MessageBlock)
544 bl Printf
545
546/*
547 * overwrite MSAR1, MEAR1, EMSAR1, and EMEAR1
548 */
549 addis r3, r0, 0x8000 /* ADDR_80 */
550 ori r3, r3, 0x0080 /* MSAR1 */
551 stwbrx r3, 0, r1
552 eieio
553 stwbrx r20, 0, r2
554
555 addis r3, r0, 0x8000 /* ADDR_88 */
556 ori r3, r3, 0x0088 /* EMSAR1 */
557 stwbrx r3, 0, r1
558 eieio
559 stwbrx r23, 0, r2
560
561 addis r3, r0, 0x8000 /* ADDR_90 */
562 ori r3, r3, 0x0090 /* MEAR1 */
563 stwbrx r3, 0, r1
564 eieio
565 stwbrx r21, 0, r2
566
567 addis r3, r0, 0x8000 /* ADDR_98 */
568 ori r3, r3, 0x0098 /* EMEAR1 */
569 stwbrx r3, 0, r1
570 eieio
571 stwbrx r24, 0, r2
572
573 addis r3, r0, 0x8000 /* ADDR_A0 */
574 ori r3, r3, 0x00a0 /* MBER */
575 stwbrx r3, 0, r1
576 eieio
577 stwbrx r22, 0, r2
578
579/*
580 * delay to let SDRAM go through several initialization/refresh cycles
581 */
582 lis r3, 3
583 mtctr r3
584memStartWait_1:
585 bdnz memStartWait_1
586 eieio
587
588/*
589 * set LEDs end
590 */
591 li r3, 0xf
6d0f6bcf 592 lis r30, CONFIG_SYS_USR_LED_BASE@h
c609719b
WD		 593 stb r3, 2(r30)
594 sync
595
596 mtlr r13
597 blr /* EXIT board_asm_init ... */
598
599/*----------------------------------------------------------------------------*/
600/*
601 * print a message to COM1 in polling mode (r10=COM1 port, r3=(char*)string)
602 */
603
604Printf:
6d0f6bcf
JCPV		 605 lis r10, CONFIG_SYS_NS16550_COM1@h /* COM1 base address*/
606 ori r10, r10, CONFIG_SYS_NS16550_COM1@l
c609719b
WD		 607WaitChr:
608 lbz r0, 5(r10) /* read link status */
609 eieio
610 andi. r0, r0, 0x40 /* mask transmitter empty bit */
611 beq cr0, WaitChr /* wait till empty */
612 lbzx r0, r0, r3 /* get char */
613 stb r0, 0(r10) /* write to transmit reg */
614 eieio
615 addi r3, r3, 1 /* next char */
616 lbzx r0, r0, r3 /* get char */
617 cmpwi cr1, r0, 0 /* end of string ? */
618 bne cr1, WaitChr
619 blr
620
621/*
622 * print a char to COM1 in polling mode (r10=COM1 port, r3=char)
623 */
624OutChr:
6d0f6bcf
JCPV		 625 lis r10, CONFIG_SYS_NS16550_COM1@h /* COM1 base address*/
626 ori r10, r10, CONFIG_SYS_NS16550_COM1@l
c609719b
WD		 627OutChr1:
628 lbz r0, 5(r10) /* read link status */
629 eieio
630 andi. r0, r0, 0x40 /* mask transmitter empty bit */
631 beq cr0, OutChr1 /* wait till empty */
632 stb r3, 0(r10) /* write to transmit reg */
633 eieio
634 blr
635
636/*
637 * print 8/4/2 digits hex value to COM1 in polling mode (r10=COM1 port, r3=val)
638 */
639OutHex2:
640 li r9, 4 /* shift reg for 2 digits */
641 b OHstart
642OutHex4:
643 li r9, 12 /* shift reg for 4 digits */
644 b OHstart
645OutHex:
646 li r9, 28 /* shift reg for 8 digits */
647OHstart:
6d0f6bcf
JCPV		 648 lis r10, CONFIG_SYS_NS16550_COM1@h /* COM1 base address*/
649 ori r10, r10, CONFIG_SYS_NS16550_COM1@l
c609719b
WD		 650OutDig:
651 lbz r0, 0(r29) /* slow down dummy read */
652 lbz r0, 5(r10) /* read link status */
653 eieio
654 andi. r0, r0, 0x40 /* mask transmitter empty bit */
655 beq cr0, OutDig
656 sraw r0, r3, r9
657 clrlwi r0, r0, 28
658 cmpwi cr1, r0, 9
659 ble cr1, digIsNum
660 addic r0, r0, 55
661 b nextDig
662digIsNum:
663 addic r0, r0, 48
664nextDig:
665 stb r0, 0(r10) /* write to transmit reg */
666 eieio
667 addic. r9, r9, -4
668 bge OutDig
669 blr
670
671/*
672 * print 3 digits hdec value to COM1 in polling mode
673 * (r10=COM1 port, r3=val, r7=x00, r8=x0, r9=x, r0, r6=scratch)
674 */
675OutDec:
676 li r6, 10
677 divwu r0, r3, r6 /* r0 = r3 / 10, r9 = r3 mod 10 */
678 mullw r10, r0, r6
679 subf r9, r10, r3
680 mr r3, r0
681 divwu r0, r3, r6 /* r0 = r3 / 10, r8 = r3 mod 10 */
682 mullw r10, r0, r6
683 subf r8, r10, r3
684 mr r3, r0
685 divwu r0, r3, r6 /* r0 = r3 / 10, r7 = r3 mod 10 */
686 mullw r10, r0, r6
687 subf r7, r10, r3
6d0f6bcf
JCPV		 688 lis r10, CONFIG_SYS_NS16550_COM1@h /* COM1 base address*/
689 ori r10, r10, CONFIG_SYS_NS16550_COM1@l
c609719b
WD		 690 or. r7, r7, r7
691 bne noblank1
692 li r3, 0x20
693 b OutDec4
694noblank1:
695 addi r3, r7, 48 /* convert to ASCII */
696OutDec4:
697 lbz r0, 0(r29) /* slow down dummy read */
698 lbz r0, 5(r10) /* read link status */
699 eieio
700 andi. r0, r0, 0x40 /* mask transmitter empty bit */
701 beq cr0, OutDec4
702 stb r3, 0(r10) /* x00 to transmit */
703 eieio
704 or. r7, r7, r8
705 beq OutDec5
706 addi r3, r8, 48 /* convert to ASCII */
707OutDec5:
708 lbz r0, 0(r29) /* slow down dummy read */
709 lbz r0, 5(r10) /* read link status */
710 eieio
711 andi. r0, r0, 0x40 /* mask transmitter empty bit */
712 beq cr0, OutDec5
713 stb r3, 0(r10) /* x0 to transmit */
714 eieio
715 addi r3, r9, 48 /* convert to ASCII */
716OutDec6:
717 lbz r0, 0(r29) /* slow down dummy read */
718 lbz r0, 5(r10) /* read link status */
719 eieio
720 andi. r0, r0, 0x40 /* mask transmitter empty bit */
721 beq cr0, OutDec6
722 stb r3, 0(r10) /* x to transmit */
723 eieio
724 blr
725
726/*
727 * hang endless loop
728 */
729toggleError: /* fail type in r6, r7=0xff, toggle LEDs */
730 stb r7, 2(r30) /* r7 to LED */
731 li r0, 0
732 lis r9, 127
733 ori r9, r9, 65535
734toggleError1:
735 addic r0, r0, 1
736 cmpw cr1, r0, r9
737 ble cr1, toggleError1
738 stb r6, 2(r30) /* r6 to LED */
739 li r0, 0
740 lis r9, 127
741 ori r9, r9, 65535
742toggleError2:
743 addic r0, r0, 1
744 cmpw cr1, r0, r9
745 ble cr1, toggleError2
746 b toggleError
747
748/*
749 * routines to read from ram spd
750 */
751spdWaitIdle:
752 lis r0, 0x1 /* timeout for about 100us */
753 mtctr r0
754iSpd:
755 lbz r10, 12(r14)
756 andi. r10, r10, 0x20 /* mask and test MBB */
757 beq idle
758 bdnz iSpd
759 orc. r10, r0, r0 /* return -1 to caller */
760idle:
761 bclr 20, 0 /* return to caller */
762
763waitSpd:
764 lis r0, 0x10 /* timeout for about 1.5ms */
765 mtctr r0
766wSpd:
767 lbz r10, 12(r14)
768 andi. r10, r10, 0x82
769 cmpli 0, 0, r10, 0x82 /* test MCF and MIF set */
770 beq wend
771 bdnz wSpd
772 orc. r10, r0, r0 /* return -1 to caller */
773 bclr 20, 0 /* return to caller */
774
775wend:
776 li r10, 0
777 stb r10, 12(r14) /* clear status */
778 bclr 20, 0 /* return to caller */
779
780/*
781 * spdread
782 * in: r3 adr to read
783 * out: r3 val or -1 for error
784 * uses r10, assumes that r14 points to I2C controller
785 */
786spdRead:
787 mfspr r25, 8 /* save link register */
788
789 bl spdWaitIdle
790 bne spdErr
791
792 li r10, 0x80 /* start with MEN */
793 stb r10, 8(r14)
794 eieio
795
796 li r10, 0xb0 /* start as master */
797 stb r10, 8(r14)
798 eieio
799
800 li r10, 0xa0 /* write device 0xA0 */
801 stb r10, 16(r14)
802 eieio
803 bl waitSpd
804 bne spdErr
805
806 lbz r10, 12(r14) /* test ACK */
807 andi. r10, r10, 0x01
808 bne gotNoAck
809
810 stb r3, 16(r14) /* data address */
811 eieio
812 bl waitSpd
813 bne spdErr
814
815
816 li r10, 0xb4 /* switch to read - restart */
817 stb r10, 8(r14)
818 eieio
819
820 li r10, 0xa1 /* read device 0xA0 */
821 stb r10, 16(r14)
822 eieio
823 bl waitSpd
824 bne spdErr
825
826 li r10, 0xa8 /* no ACK */
827 stb r10, 8(r14)
828 eieio
829
830 lbz r10, 16(r14) /* trigger read next byte */
831 eieio
832 bl waitSpd
833 bne spdErr
834
835 li r10, 0x88 /* generate STOP condition */
836 stb r10, 8(r14)
837 eieio
838
839 lbz r3, 16(r14) /* return read byte */
840
841 mtspr 8, r25 /* restore link register */
842 blr
843
844gotNoAck:
845 li r10, 0x80 /* generate STOP condition */
846 stb r10, 8(r14)
847 eieio
848spdErr:
849 orc r3, r0, r0 /* return -1 */
850 mtspr 8, r25 /* restore link register */
851 blr
852
853get_lnk_reg:
854 mflr r3 /* return link reg */
855 blr
856
857MessageBlock:
858
859MinitLogo:
860 .ascii "\015\012*** ELTEC Elektronik, Mainz ***\015\012"
861 .ascii "\015\012Initialising RAM\015\012\000"
862Mspd01:
863 .ascii " Reading SPD of SODIMM ...... \000"
864MramTyp:
865 .ascii "\015\012\SDRAM with CL=2 at 100 MHz required!\015\012\000"
866MramConfErr:
867 .ascii "\015\012\Unsupported SODIMM Configuration!\015\012\000"
868Mactivate:
869 .ascii " Activating \000"
870Mact0123e:
871 .ascii " MByte.\015\012\000"
872Mok:
873 .ascii "OK \015\012\000"
874Mfail:
875 .ascii "FAILED \015\012\000"
876MnewLine:
877 .ascii "\015\012\000"
878 .align 4
"Das U-Boot" Source Tree