]> git.ipfire.org Git - people/ms/u-boot.git/blame - common/cmd_fdc.c
projects / people / ms / u-boot.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Quick & Dirty fix for log buffer problem when environment is not set
[people/ms/u-boot.git] / common / cmd_fdc.c
CommitLineData
3863585b
WD		 1/*
2 * (C) Copyright 2001
3 * Denis Peter, MPL AG, d.peter@mpl.ch.
4 *
5 * See file CREDITS for list of people who contributed to this
6 * project.
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (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,
21 * MA 02111-1307 USA
22 *
23 */
24/*
25 * Floppy Disk support
26 */
27
28#include <common.h>
29#include <config.h>
30#include <command.h>
31#include <image.h>
32
33
34#undef FDC_DEBUG
35
36#ifdef FDC_DEBUG
37#define PRINTF(fmt,args...) printf (fmt ,##args)
38#else
39#define PRINTF(fmt,args...)
40#endif
41
42#ifndef TRUE
43#define TRUE 1
44#endif
45#ifndef FALSE
46#define FALSE 0
47#endif
48
49
50#if (CONFIG_COMMANDS & CFG_CMD_DATE)
51#include <rtc.h>
52#endif
53
54#if (CONFIG_COMMANDS & CFG_CMD_FDC)
55
56
57typedef struct {
58 int flags; /* connected drives ect */
59 unsigned long blnr; /* Logical block nr */
60 uchar drive; /* drive no */
61 uchar cmdlen; /* cmd length */
62 uchar cmd[16]; /* cmd desc */
63 uchar dma; /* if > 0 dma enabled */
64 uchar result[11];/* status information */
65 uchar resultlen; /* lenght of result */
66} FDC_COMMAND_STRUCT;
67/* flags: only the lower 8bit used:
68 * bit 0 if set drive 0 is present
69 * bit 1 if set drive 1 is present
70 * bit 2 if set drive 2 is present
71 * bit 3 if set drive 3 is present
72 * bit 4 if set disk in drive 0 is inserted
73 * bit 5 if set disk in drive 1 is inserted
74 * bit 6 if set disk in drive 2 is inserted
75 * bit 7 if set disk in drive 4 is inserted
76 */
77
78
79/* cmd indexes */
80#define COMMAND 0
81#define DRIVE 1
82#define CONFIG0 1
83#define SPEC_HUTSRT 1
84#define TRACK 2
85#define CONFIG1 2
86#define SPEC_HLT 2
87#define HEAD 3
88#define CONFIG2 3
89#define SECTOR 4
90#define SECTOR_SIZE 5
91#define LAST_TRACK 6
92#define GAP 7
93#define DTL 8
94/* result indexes */
95#define STATUS_0 0
96#define STATUS_PCN 1
97#define STATUS_1 1
98#define STATUS_2 2
99#define STATUS_TRACK 3
100#define STATUS_HEAD 4
101#define STATUS_SECT 5
102#define STATUS_SECT_SIZE 6
103
104
105/* Register addresses */
106#define FDC_BASE 0x3F0
107#define FDC_SRA FDC_BASE + 0 /* Status Register A */
108#define FDC_SRB FDC_BASE + 1 /* Status Register B */
109#define FDC_DOR FDC_BASE + 2 /* Digital Output Register */
110#define FDC_TDR FDC_BASE + 3 /* Tape Drive Register */
111#define FDC_DSR FDC_BASE + 4 /* Data rate Register */
112#define FDC_MSR FDC_BASE + 4 /* Main Status Register */
113#define FDC_FIFO FDC_BASE + 5 /* FIFO */
114#define FDC_DIR FDC_BASE + 6 /* Digital Input Register */
115#define FDC_CCR FDC_BASE + 7 /* Configuration Control */
116/* Commands */
117#define FDC_CMD_SENSE_INT 0x08
118#define FDC_CMD_CONFIGURE 0x13
119#define FDC_CMD_SPECIFY 0x03
120#define FDC_CMD_RECALIBRATE 0x07
121#define FDC_CMD_READ 0x06
122#define FDC_CMD_READ_TRACK 0x02
123#define FDC_CMD_READ_ID 0x0A
124#define FDC_CMD_DUMP_REG 0x0E
125#define FDC_CMD_SEEK 0x0F
126
127#define FDC_CMD_SENSE_INT_LEN 0x01
128#define FDC_CMD_CONFIGURE_LEN 0x04
129#define FDC_CMD_SPECIFY_LEN 0x03
130#define FDC_CMD_RECALIBRATE_LEN 0x02
131#define FDC_CMD_READ_LEN 0x09
132#define FDC_CMD_READ_TRACK_LEN 0x09
133#define FDC_CMD_READ_ID_LEN 0x02
134#define FDC_CMD_DUMP_REG_LEN 0x01
135#define FDC_CMD_SEEK_LEN 0x03
136
137#define FDC_FIFO_THR 0x0C
138#define FDC_FIFO_DIS 0x00
139#define FDC_IMPLIED_SEEK 0x01
140#define FDC_POLL_DIS 0x00
141#define FDC_PRE_TRK 0x00
142#define FDC_CONFIGURE FDC_FIFO_THR | (FDC_POLL_DIS<<4) | (FDC_FIFO_DIS<<5) | (FDC_IMPLIED_SEEK << 6)
143#define FDC_MFM_MODE 0x01 /* MFM enable */
144#define FDC_SKIP_MODE 0x00 /* skip enable */
145
146#define FDC_TIME_OUT 100000 /* time out */
147#define FDC_RW_RETRIES 3 /* read write retries */
148#define FDC_CAL_RETRIES 3 /* calibration and seek retries */
149
150
151/* Disk structure */
152typedef struct {
153 unsigned int size; /* nr of sectors total */
154 unsigned int sect; /* sectors per track */
155 unsigned int head; /* nr of heads */
156 unsigned int track; /* nr of tracks */
157 unsigned int stretch; /* !=0 means double track steps */
158 unsigned char gap; /* gap1 size */
159 unsigned char rate; /* data rate. |= 0x40 for perpendicular */
160 unsigned char spec1; /* stepping rate, head unload time */
161 unsigned char fmt_gap; /* gap2 size */
162 unsigned char hlt; /* head load time */
163 unsigned char sect_code; /* Sector Size code */
164 const char * name; /* used only for predefined formats */
165} FD_GEO_STRUCT;
166
167
168/* supported Floppy types (currently only one) */
169const static FD_GEO_STRUCT floppy_type[2] = {
170 { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,16,2,"H1440" }, /* 7 1.44MB 3.5" */
171 { 0, 0,0, 0,0,0x00,0x00,0x00,0x00, 0,0,NULL }, /* end of table */
172};
173
174static FDC_COMMAND_STRUCT cmd; /* global command struct */
175
176/* Supporting Functions */
177/* reads a Register of the FDC */
178unsigned char read_fdc_reg(unsigned int addr)
179{
180 volatile unsigned char *val = (volatile unsigned char *)(CFG_ISA_IO_BASE_ADDRESS | addr);
181 return val[0];
182}
183
184/* writes a Register of the FDC */
185void write_fdc_reg(unsigned int addr, unsigned char val)
186{
187 volatile unsigned char *tmp = (volatile unsigned char *)(CFG_ISA_IO_BASE_ADDRESS | addr);
188 tmp[0]=val;
189}
190
191/* waits for an interrupt (polling) */
192int wait_for_fdc_int(void)
193{
194 unsigned long timeout;
195 timeout = FDC_TIME_OUT;
196 while((read_fdc_reg(FDC_SRA)&0x80)==0) {
197 timeout--;
198 udelay(10);
199 if(timeout==0) /* timeout occured */
200 return FALSE;
201 }
202 return TRUE;
203}
204
205
206/* reads a byte from the FIFO of the FDC and checks direction and RQM bit
207 of the MSR. returns -1 if timeout, or byte if ok */
208int read_fdc_byte(void)
209{
210 unsigned long timeout;
211 timeout = FDC_TIME_OUT;
212 while((read_fdc_reg(FDC_MSR)&0xC0)!=0xC0) {
213 /* direction out and ready */
214 udelay(10);
215 timeout--;
216 if(timeout==0) /* timeout occured */
217 return -1;
218 }
219 return read_fdc_reg(FDC_FIFO);
220}
221
222/* if the direction of the FIFO is wrong, this routine is used to
223 empty the FIFO. Should _not_ be used */
224int fdc_need_more_output(void)
225{
226 unsigned char c;
227 while((read_fdc_reg(FDC_MSR)&0xC0)==0xC0) {
228 c=(unsigned char)read_fdc_byte();
229 printf("Error: more output: %x\n",c);
230 }
231 return TRUE;
232}
233
234
235/* writes a byte to the FIFO of the FDC and checks direction and RQM bit
236 of the MSR */
237int write_fdc_byte(unsigned char val)
238{
239 unsigned long timeout;
240 timeout = FDC_TIME_OUT;
241 while((read_fdc_reg(FDC_MSR)&0xC0)!=0x80) {
242 /* direction in and ready for byte */
243 timeout--;
244 udelay(10);
245 fdc_need_more_output();
246 if(timeout==0) /* timeout occured */
247 return FALSE;
248 }
249 write_fdc_reg(FDC_FIFO,val);
250 return TRUE;
251}
252
253/* sets up all FDC commands and issues it to the FDC. If
254 the command causes direct results (no Execution Phase)
255 the result is be read as well. */
256
257int fdc_issue_cmd(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
258{
259 int i;
260 unsigned long head,track,sect,timeout;
261 track = pCMD->blnr / (pFG->sect * pFG->head); /* track nr */
262 sect = pCMD->blnr % (pFG->sect * pFG->head); /* remaining blocks */
263 head = sect / pFG->sect; /* head nr */
264 sect = sect % pFG->sect; /* remaining blocks */
265 sect++; /* sectors are 1 based */
266 PRINTF("Track %ld, Head %ld, Sector %ld, Drive %d (blnr %ld)\n",track,head,sect,pCMD->drive,pCMD->blnr);
267 if(head|=0) { /* max heads = 2 */
268 pCMD->cmd[DRIVE]=pCMD->drive | 0x04; /* head 1 */
269 pCMD->cmd[HEAD]=(unsigned char) head; /* head register */
270 }
271 else {
272 pCMD->cmd[DRIVE]=pCMD->drive; /* head 0 */
273 pCMD->cmd[HEAD]=(unsigned char) head; /* head register */
274 }
275 pCMD->cmd[TRACK]=(unsigned char) track; /* track */
276 switch (pCMD->cmd[COMMAND]) {
277 case FDC_CMD_READ:
278 pCMD->cmd[SECTOR]=(unsigned char) sect; /* sector */
279 pCMD->cmd[SECTOR_SIZE]=pFG->sect_code; /* sector size code */
280 pCMD->cmd[LAST_TRACK]=pFG->sect; /* End of track */
281 pCMD->cmd[GAP]=pFG->gap; /* gap */
282 pCMD->cmd[DTL]=0xFF; /* DTL */
283 pCMD->cmdlen=FDC_CMD_READ_LEN;
284 pCMD->cmd[COMMAND]|=(FDC_MFM_MODE<<6); /* set MFM bit */
285 pCMD->cmd[COMMAND]|=(FDC_SKIP_MODE<<5); /* set Skip bit */
286 pCMD->resultlen=0; /* result only after execution */
287 break;
288 case FDC_CMD_SEEK:
289 pCMD->cmdlen=FDC_CMD_SEEK_LEN;
290 pCMD->resultlen=0; /* no result */
291 break;
292 case FDC_CMD_CONFIGURE:
293 pCMD->cmd[CONFIG0]=0;
294 pCMD->cmd[CONFIG1]=FDC_CONFIGURE; /* FIFO Threshold, Poll, Enable FIFO */
295 pCMD->cmd[CONFIG2]=FDC_PRE_TRK; /* Precompensation Track */
296 pCMD->cmdlen=FDC_CMD_CONFIGURE_LEN;
297 pCMD->resultlen=0; /* no result */
298 break;
299 case FDC_CMD_SPECIFY:
300 pCMD->cmd[SPEC_HUTSRT]=pFG->spec1;
301 pCMD->cmd[SPEC_HLT]=(pFG->hlt)<<1; /* head load time */
302 if(pCMD->dma==0)
303 pCMD->cmd[SPEC_HLT]|=0x1; /* no dma */
304 pCMD->cmdlen=FDC_CMD_SPECIFY_LEN;
305 pCMD->resultlen=0; /* no result */
306 break;
307 case FDC_CMD_DUMP_REG:
308 pCMD->cmdlen=FDC_CMD_DUMP_REG_LEN;
309 pCMD->resultlen=10; /* 10 byte result */
310 break;
311 case FDC_CMD_READ_ID:
312 pCMD->cmd[COMMAND]|=(FDC_MFM_MODE<<6); /* set MFM bit */
313 pCMD->cmdlen=FDC_CMD_READ_ID_LEN;
314 pCMD->resultlen=7; /* 7 byte result */
315 break;
316 case FDC_CMD_RECALIBRATE:
317 pCMD->cmd[DRIVE]&=0x03; /* don't set the head bit */
318 pCMD->cmdlen=FDC_CMD_RECALIBRATE_LEN;
319 pCMD->resultlen=0; /* no result */
320 break;
321 break;
322 case FDC_CMD_SENSE_INT:
323 pCMD->cmdlen=FDC_CMD_SENSE_INT_LEN;
324 pCMD->resultlen=2;
325 break;
326 }
327 for(i=0;i<pCMD->cmdlen;i++) {
328 /* PRINTF("write cmd%d = 0x%02X\n",i,pCMD->cmd[i]); */
329 if(write_fdc_byte(pCMD->cmd[i])==FALSE) {
330 PRINTF("Error: timeout while issue cmd%d\n",i);
331 return FALSE;
332 }
333 }
334 timeout=FDC_TIME_OUT;
335 for(i=0;i<pCMD->resultlen;i++) {
336 while((read_fdc_reg(FDC_MSR)&0xC0)!=0xC0) {
337 timeout--;
338 if(timeout==0) {
339 PRINTF(" timeout while reading result%d MSR=0x%02X\n",i,read_fdc_reg(FDC_MSR));
340 return FALSE;
341 }
342 }
343 pCMD->result[i]=(unsigned char)read_fdc_byte();
344 }
345 return TRUE;
346}
347
348/* selects the drive assigned in the cmd structur and
349 switches on the Motor */
350void select_fdc_drive(FDC_COMMAND_STRUCT *pCMD)
351{
352 unsigned char val;
353
354 val=(1<<(4+pCMD->drive))|pCMD->drive|0xC; /* set reset, dma gate and motor bits */
355 if((read_fdc_reg(FDC_DOR)&val)!=val) {
356 write_fdc_reg(FDC_DOR,val);
357 for(val=0;val<255;val++)
358 udelay(500); /* wait some time to start motor */
359 }
360}
361
362/* switches off the Motor of the specified drive */
363void stop_fdc_drive(FDC_COMMAND_STRUCT *pCMD)
364{
365 unsigned char val;
366
367 val=(1<<(4+pCMD->drive))|pCMD->drive; /* sets motor bits */
368 write_fdc_reg(FDC_DOR,(read_fdc_reg(FDC_DOR)&~val));
369}
370
371/* issues a recalibrate command, waits for interrupt and
372 * issues a sense_interrupt */
373int fdc_recalibrate(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
374{
375 pCMD->cmd[COMMAND]=FDC_CMD_RECALIBRATE;
376 if(fdc_issue_cmd(pCMD,pFG)==FALSE)
377 return FALSE;
378 while(wait_for_fdc_int()!=TRUE);
379 pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
380 return(fdc_issue_cmd(pCMD,pFG));
381}
382
383/* issues a recalibrate command, waits for interrupt and
384 * issues a sense_interrupt */
385int fdc_seek(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
386{
387 pCMD->cmd[COMMAND]=FDC_CMD_SEEK;
388 if(fdc_issue_cmd(pCMD,pFG)==FALSE)
389 return FALSE;
390 while(wait_for_fdc_int()!=TRUE);
391 pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
392 return(fdc_issue_cmd(pCMD,pFG));
393}
394
395
396/* terminates current command, by not servicing the FIFO
397 * waits for interrupt and fills in the result bytes */
398int fdc_terminate(FDC_COMMAND_STRUCT *pCMD)
399{
400 int i;
401 for(i=0;i<100;i++)
402 udelay(500); /* wait 500usec for fifo overrun */
403 while((read_fdc_reg(FDC_SRA)&0x80)==0x00); /* wait as long as no int has occured */
404 for(i=0;i<7;i++) {
405 pCMD->result[i]=(unsigned char)read_fdc_byte();
406 }
407 return TRUE;
408}
409
410/* reads data from FDC, seek commands are issued automatic */
411int fdc_read_data(unsigned char *buffer, unsigned long blocks,FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
412{
413 /* first seek to start address */
414 unsigned long len,lastblk,readblk,i,timeout,ii,offset;
415 unsigned char pcn,c,retriesrw,retriescal;
416 unsigned char *bufferw; /* working buffer */
417 int sect_size;
418 int flags;
419
420 flags=disable_interrupts(); /* switch off all Interrupts */
421 select_fdc_drive(pCMD); /* switch on drive */
422 sect_size=0x080<<pFG->sect_code;
423 retriesrw=0;
424 retriescal=0;
425 offset=0;
426 if(fdc_seek(pCMD,pFG)==FALSE) {
427 stop_fdc_drive(pCMD);
428 enable_interrupts();
429 return FALSE;
430 }
431 if((pCMD->result[STATUS_0]&0x20)!=0x20) {
432 printf("Seek error Status: %02X\n",pCMD->result[STATUS_0]);
433 stop_fdc_drive(pCMD);
434 enable_interrupts();
435 return FALSE;
436 }
437 pcn=pCMD->result[STATUS_PCN]; /* current track */
438 /* now determine the next seek point */
439 lastblk=pCMD->blnr + blocks;
440 /* readblk=(pFG->head*pFG->sect)-(pCMD->blnr%(pFG->head*pFG->sect)); */
441 readblk=pFG->sect-(pCMD->blnr%pFG->sect);
442 PRINTF("1st nr of block possible read %ld start %ld\n",readblk,pCMD->blnr);
443 if(readblk>blocks) /* is end within 1st track */
444 readblk=blocks; /* yes, correct it */
445 PRINTF("we read %ld blocks start %ld\n",readblk,pCMD->blnr);
446 bufferw=&buffer[0]; /* setup working buffer */
447 do {
448retryrw:
449 len=sect_size * readblk;
450 pCMD->cmd[COMMAND]=FDC_CMD_READ;
451 if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
452 stop_fdc_drive(pCMD);
453 enable_interrupts();
454 return FALSE;
455 }
456 for (i=0;i<len;i++) {
457 timeout=FDC_TIME_OUT;
458 do {
459 c=read_fdc_reg(FDC_MSR);
460 if((c&0xC0)==0xC0) {
461 bufferw[i]=read_fdc_reg(FDC_FIFO);
462 break;
463 }
464 if((c&0xC0)==0x80) { /* output */
465 PRINTF("Transfer error transfered: at %ld, MSR=%02X\n",i,c);
466 if(i>6) {
467 for(ii=0;ii<7;ii++) {
468 pCMD->result[ii]=bufferw[(i-7+ii)];
469 } /* for */
470 }
471 if(retriesrw++>FDC_RW_RETRIES) {
472 if (retriescal++>FDC_CAL_RETRIES) {
473 stop_fdc_drive(pCMD);
474 enable_interrupts();
475 return FALSE;
476 }
477 else {
478 PRINTF(" trying to recalibrate Try %d\n",retriescal);
479 if(fdc_recalibrate(pCMD,pFG)==FALSE) {
480 stop_fdc_drive(pCMD);
481 enable_interrupts();
482 return FALSE;
483 }
484 retriesrw=0;
485 goto retrycal;
486 } /* else >FDC_CAL_RETRIES */
487 }
488 else {
489 PRINTF("Read retry %d\n",retriesrw);
490 goto retryrw;
491 } /* else >FDC_RW_RETRIES */
492 }/* if output */
493 timeout--;
494 }while(TRUE);
495 } /* for len */
496 /* the last sector of a track or all data has been read,
497 * we need to get the results */
498 fdc_terminate(pCMD);
499 offset+=(sect_size*readblk); /* set up buffer pointer */
500 bufferw=&buffer[offset];
501 pCMD->blnr+=readblk; /* update current block nr */
502 blocks-=readblk; /* update blocks */
503 if(blocks==0)
504 break; /* we are finish */
505 /* setup new read blocks */
506 /* readblk=pFG->head*pFG->sect; */
507 readblk=pFG->sect;
508 if(readblk>blocks)
509 readblk=blocks;
510retrycal:
511 /* a seek is necessary */
512 if(fdc_seek(pCMD,pFG)==FALSE) {
513 stop_fdc_drive(pCMD);
514 enable_interrupts();
515 return FALSE;
516 }
517 if((pCMD->result[STATUS_0]&0x20)!=0x20) {
518 PRINTF("Seek error Status: %02X\n",pCMD->result[STATUS_0]);
519 stop_fdc_drive(pCMD);
520 return FALSE;
521 }
522 pcn=pCMD->result[STATUS_PCN]; /* current track */
523 }while(TRUE); /* start over */
524 stop_fdc_drive(pCMD); /* switch off drive */
525 enable_interrupts();
526 return TRUE;
527}
528
529/* Scan all drives and check if drive is present and disk is inserted */
530int fdc_check_drive(FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
531{
532 int i,drives,state;
533 /* OK procedure of data book is satisfied.
534 * trying to get some information over the drives */
535 state=0; /* no drives, no disks */
536 for(drives=0;drives<4;drives++) {
537 pCMD->drive=drives;
538 select_fdc_drive(pCMD);
539 pCMD->blnr=0; /* set to the 1st block */
540 if(fdc_recalibrate(pCMD,pFG)==FALSE)
541 break;
542 if((pCMD->result[STATUS_0]&0x10)==0x10)
543 break;
544 /* ok drive connected check for disk */
545 state|=(1<<drives);
546 pCMD->blnr=pFG->size; /* set to the last block */
547 if(fdc_seek(pCMD,pFG)==FALSE)
548 break;
549 pCMD->blnr=0; /* set to the 1st block */
550 if(fdc_recalibrate(pCMD,pFG)==FALSE)
551 break;
552 pCMD->cmd[COMMAND]=FDC_CMD_READ_ID;
553 if(fdc_issue_cmd(pCMD,pFG)==FALSE)
554 break;
555 state|=(0x10<<drives);
556 }
557 stop_fdc_drive(pCMD);
558 for(i=0;i<4;i++) {
559 PRINTF("Floppy Drive %d %sconnected %sDisk inserted %s\n",i,
560 ((state&(1<<i))==(1<<i)) ? "":"not ",
561 ((state&(0x10<<i))==(0x10<<i)) ? "":"no ",
562 ((state&(0x10<<i))==(0x10<<i)) ? pFG->name : "");
563 }
564 pCMD->flags=state;
565 return TRUE;
566}
567
568
569/**************************************************************************
570* int fdc_setup
571* setup the fdc according the datasheet
572* assuming in PS2 Mode
573*/
574int fdc_setup(FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
575{
576
577 int i;
578 /* first, we reset the FDC via the DOR */
579 write_fdc_reg(FDC_DOR,0x00);
580 for(i=0; i<255; i++) /* then we wait some time */
581 udelay(500);
582 /* then, we clear the reset in the DOR */
583 pCMD->drive=0;
584 select_fdc_drive(pCMD);
585 /* initialize the CCR */
586 write_fdc_reg(FDC_CCR,pFG->rate);
587 /* then initialize the DSR */
588 write_fdc_reg(FDC_DSR,pFG->rate);
589 if(wait_for_fdc_int()==FALSE) {
590 PRINTF("Time Out after writing CCR\n");
591 return FALSE;
592 }
593 /* now issue sense Interrupt and status command
594 * assuming only one drive present (drive 0) */
595 pCMD->dma=0; /* we don't use any dma at all */
596 for(i=0;i<4;i++) {
597 /* issue sense interrupt for all 4 possible drives */
598 pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
599 if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
600 PRINTF("Sense Interrupt for drive %d failed\n",i);
601 }
602 }
603 /* assuming drive 0 for rest of configuration
604 * issue the configure command */
605 pCMD->drive=0;
606 select_fdc_drive(pCMD);
607 pCMD->cmd[COMMAND]=FDC_CMD_CONFIGURE;
608 if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
609 PRINTF(" configure timeout\n");
610 stop_fdc_drive(pCMD);
611 return FALSE;
612 }
613 /* issue specify command */
614 pCMD->cmd[COMMAND]=FDC_CMD_SPECIFY;
615 if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
616 PRINTF(" specify timeout\n");
617 stop_fdc_drive(pCMD);
618 return FALSE;
619
620 }
621 /* then, we clear the reset in the DOR */
622 /* fdc_check_drive(pCMD,pFG); */
623 /* write_fdc_reg(FDC_DOR,0x04); */
624 return TRUE;
625}
626
627/****************************************************************************
628 * main routine do_fdcboot
629 */
630int do_fdcboot (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
631{
632 FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
633 FDC_COMMAND_STRUCT *pCMD = &cmd;
634 unsigned long addr,imsize;
635 image_header_t *hdr; /* used for fdc boot */
636 unsigned char boot_drive;
637 int i,nrofblk;
638 char *ep;
639 int rcode = 0;
640
641 switch (argc) {
642 case 1:
643 addr = CFG_LOAD_ADDR;
644 boot_drive=0; /* default boot from drive 0 */
645 break;
646 case 2:
647 addr = simple_strtoul(argv[1], NULL, 16);
648 boot_drive=0; /* default boot from drive 0 */
649 break;
650 case 3:
651 addr = simple_strtoul(argv[1], NULL, 16);
652 boot_drive=simple_strtoul(argv[2], NULL, 10);
653 break;
654 default:
655 printf ("Usage:\n%s\n", cmdtp->usage);
656 return 1;
657 }
658 /* setup FDC and scan for drives */
659 if(fdc_setup(pCMD,pFG)==FALSE) {
660 printf("\n** Error in setup FDC **\n");
661 return 1;
662 }
663 if(fdc_check_drive(pCMD,pFG)==FALSE) {
664 printf("\n** Error in check_drives **\n");
665 return 1;
666 }
667 if((pCMD->flags&(1<<boot_drive))==0) {
668 /* drive not available */
669 printf("\n** Drive %d not availabe **\n",boot_drive);
670 return 1;
671 }
672 if((pCMD->flags&(0x10<<boot_drive))==0) {
673 /* no disk inserted */
674 printf("\n** No disk inserted in drive %d **\n",boot_drive);
675 return 1;
676 }
677 /* ok, we have a valid source */
678 pCMD->drive=boot_drive;
679 /* read first block */
680 pCMD->blnr=0;
681 if(fdc_read_data((unsigned char *)addr,1,pCMD,pFG)==FALSE) {
682 printf("\nRead error:");
683 for(i=0;i<7;i++)
684 printf("result%d: 0x%02X\n",i,pCMD->result[i]);
685 return 1;
686 }
687 hdr = (image_header_t *)addr;
688 if (hdr->ih_magic != IH_MAGIC) {
689 printf ("Bad Magic Number\n");
690 return 1;
691 }
692 print_image_hdr(hdr);
693
694 imsize= hdr->ih_size+sizeof(image_header_t);
695 nrofblk=imsize/512;
696 if((imsize%512)>0)
697 nrofblk++;
698 printf("Loading %ld Bytes (%d blocks) at 0x%08lx..\n",imsize,nrofblk,addr);
699 pCMD->blnr=0;
700 if(fdc_read_data((unsigned char *)addr,nrofblk,pCMD,pFG)==FALSE) {
701 /* read image block */
702 printf("\nRead error:");
703 for(i=0;i<7;i++)
704 printf("result%d: 0x%02X\n",i,pCMD->result[i]);
705 return 1;
706 }
707 printf("OK %ld Bytes loaded.\n",imsize);
708
709 flush_cache (addr, imsize);
710 /* Loading ok, update default load address */
711
712 load_addr = addr;
713 if(hdr->ih_type == IH_TYPE_KERNEL) {
714 /* Check if we should attempt an auto-start */
715 if (((ep = getenv("autostart")) != NULL) && (strcmp(ep,"yes") == 0)) {
716 char *local_args[2];
717 extern int do_bootm (cmd_tbl_t *, int, int, char *[]);
718
719 local_args[0] = argv[0];
720 local_args[1] = NULL;
721
722 printf ("Automatic boot of image at addr 0x%08lX ...\n", addr);
723
724 do_bootm (cmdtp, 0, 1, local_args);
725 rcode ++;
726 }
727 }
728 return rcode;
729}
730
731
732
733#endif /* CONFIG_COMMANDS & CFG_CMD_FDC */
734
735
"Das U-Boot" Source Tree