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[people/ms/u-boot.git] / common / cmd_fdc.c
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) || (CONFIG_COMMANDS & CFG_CMD_FDOS))
55
56
57 typedef 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 */
152 typedef 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) */
169 const 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
174 static FDC_COMMAND_STRUCT cmd; /* global command struct */
175
176 /* If the boot drive number is undefined, we assume it's drive 0 */
177 #ifndef CFG_FDC_DRIVE_NUMBER
178 #define CFG_FDC_DRIVE_NUMBER 0
179 #endif
180
181 /* Hardware access */
182 #ifndef CFG_ISA_IO_STRIDE
183 #define CFG_ISA_IO_STRIDE 1
184 #endif
185
186 #ifndef CFG_ISA_IO_OFFSET
187 #define CFG_ISA_IO_OFFSET 0
188 #endif
189
190
191 /* Supporting Functions */
192 /* reads a Register of the FDC */
193 unsigned char read_fdc_reg(unsigned int addr)
194 {
195 volatile unsigned char *val =
196 (volatile unsigned char *)(CFG_ISA_IO_BASE_ADDRESS +
197 (addr * CFG_ISA_IO_STRIDE) +
198 CFG_ISA_IO_OFFSET);
199
200 return val [0];
201 }
202
203 /* writes a Register of the FDC */
204 void write_fdc_reg(unsigned int addr, unsigned char val)
205 {
206 volatile unsigned char *tmp =
207 (volatile unsigned char *)(CFG_ISA_IO_BASE_ADDRESS +
208 (addr * CFG_ISA_IO_STRIDE) +
209 CFG_ISA_IO_OFFSET);
210 tmp[0]=val;
211 }
212
213 /* waits for an interrupt (polling) */
214 int wait_for_fdc_int(void)
215 {
216 unsigned long timeout;
217 timeout = FDC_TIME_OUT;
218 while((read_fdc_reg(FDC_SRA)&0x80)==0) {
219 timeout--;
220 udelay(10);
221 if(timeout==0) /* timeout occured */
222 return FALSE;
223 }
224 return TRUE;
225 }
226
227
228 /* reads a byte from the FIFO of the FDC and checks direction and RQM bit
229 of the MSR. returns -1 if timeout, or byte if ok */
230 int read_fdc_byte(void)
231 {
232 unsigned long timeout;
233 timeout = FDC_TIME_OUT;
234 while((read_fdc_reg(FDC_MSR)&0xC0)!=0xC0) {
235 /* direction out and ready */
236 udelay(10);
237 timeout--;
238 if(timeout==0) /* timeout occured */
239 return -1;
240 }
241 return read_fdc_reg(FDC_FIFO);
242 }
243
244 /* if the direction of the FIFO is wrong, this routine is used to
245 empty the FIFO. Should _not_ be used */
246 int fdc_need_more_output(void)
247 {
248 unsigned char c;
249 while((read_fdc_reg(FDC_MSR)&0xC0)==0xC0) {
250 c=(unsigned char)read_fdc_byte();
251 printf("Error: more output: %x\n",c);
252 }
253 return TRUE;
254 }
255
256
257 /* writes a byte to the FIFO of the FDC and checks direction and RQM bit
258 of the MSR */
259 int write_fdc_byte(unsigned char val)
260 {
261 unsigned long timeout;
262 timeout = FDC_TIME_OUT;
263 while((read_fdc_reg(FDC_MSR)&0xC0)!=0x80) {
264 /* direction in and ready for byte */
265 timeout--;
266 udelay(10);
267 fdc_need_more_output();
268 if(timeout==0) /* timeout occured */
269 return FALSE;
270 }
271 write_fdc_reg(FDC_FIFO,val);
272 return TRUE;
273 }
274
275 /* sets up all FDC commands and issues it to the FDC. If
276 the command causes direct results (no Execution Phase)
277 the result is be read as well. */
278
279 int fdc_issue_cmd(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
280 {
281 int i;
282 unsigned long head,track,sect,timeout;
283 track = pCMD->blnr / (pFG->sect * pFG->head); /* track nr */
284 sect = pCMD->blnr % (pFG->sect * pFG->head); /* remaining blocks */
285 head = sect / pFG->sect; /* head nr */
286 sect = sect % pFG->sect; /* remaining blocks */
287 sect++; /* sectors are 1 based */
288 PRINTF("Cmd 0x%02x Track %ld, Head %ld, Sector %ld, Drive %d (blnr %ld)\n",
289 pCMD->cmd[0],track,head,sect,pCMD->drive,pCMD->blnr);
290
291 if(head|=0) { /* max heads = 2 */
292 pCMD->cmd[DRIVE]=pCMD->drive | 0x04; /* head 1 */
293 pCMD->cmd[HEAD]=(unsigned char) head; /* head register */
294 }
295 else {
296 pCMD->cmd[DRIVE]=pCMD->drive; /* head 0 */
297 pCMD->cmd[HEAD]=(unsigned char) head; /* head register */
298 }
299 pCMD->cmd[TRACK]=(unsigned char) track; /* track */
300 switch (pCMD->cmd[COMMAND]) {
301 case FDC_CMD_READ:
302 pCMD->cmd[SECTOR]=(unsigned char) sect; /* sector */
303 pCMD->cmd[SECTOR_SIZE]=pFG->sect_code; /* sector size code */
304 pCMD->cmd[LAST_TRACK]=pFG->sect; /* End of track */
305 pCMD->cmd[GAP]=pFG->gap; /* gap */
306 pCMD->cmd[DTL]=0xFF; /* DTL */
307 pCMD->cmdlen=FDC_CMD_READ_LEN;
308 pCMD->cmd[COMMAND]|=(FDC_MFM_MODE<<6); /* set MFM bit */
309 pCMD->cmd[COMMAND]|=(FDC_SKIP_MODE<<5); /* set Skip bit */
310 pCMD->resultlen=0; /* result only after execution */
311 break;
312 case FDC_CMD_SEEK:
313 pCMD->cmdlen=FDC_CMD_SEEK_LEN;
314 pCMD->resultlen=0; /* no result */
315 break;
316 case FDC_CMD_CONFIGURE:
317 pCMD->cmd[CONFIG0]=0;
318 pCMD->cmd[CONFIG1]=FDC_CONFIGURE; /* FIFO Threshold, Poll, Enable FIFO */
319 pCMD->cmd[CONFIG2]=FDC_PRE_TRK; /* Precompensation Track */
320 pCMD->cmdlen=FDC_CMD_CONFIGURE_LEN;
321 pCMD->resultlen=0; /* no result */
322 break;
323 case FDC_CMD_SPECIFY:
324 pCMD->cmd[SPEC_HUTSRT]=pFG->spec1;
325 pCMD->cmd[SPEC_HLT]=(pFG->hlt)<<1; /* head load time */
326 if(pCMD->dma==0)
327 pCMD->cmd[SPEC_HLT]|=0x1; /* no dma */
328 pCMD->cmdlen=FDC_CMD_SPECIFY_LEN;
329 pCMD->resultlen=0; /* no result */
330 break;
331 case FDC_CMD_DUMP_REG:
332 pCMD->cmdlen=FDC_CMD_DUMP_REG_LEN;
333 pCMD->resultlen=10; /* 10 byte result */
334 break;
335 case FDC_CMD_READ_ID:
336 pCMD->cmd[COMMAND]|=(FDC_MFM_MODE<<6); /* set MFM bit */
337 pCMD->cmdlen=FDC_CMD_READ_ID_LEN;
338 pCMD->resultlen=7; /* 7 byte result */
339 break;
340 case FDC_CMD_RECALIBRATE:
341 pCMD->cmd[DRIVE]&=0x03; /* don't set the head bit */
342 pCMD->cmdlen=FDC_CMD_RECALIBRATE_LEN;
343 pCMD->resultlen=0; /* no result */
344 break;
345 break;
346 case FDC_CMD_SENSE_INT:
347 pCMD->cmdlen=FDC_CMD_SENSE_INT_LEN;
348 pCMD->resultlen=2;
349 break;
350 }
351 for(i=0;i<pCMD->cmdlen;i++) {
352 /* PRINTF("write cmd%d = 0x%02X\n",i,pCMD->cmd[i]); */
353 if(write_fdc_byte(pCMD->cmd[i])==FALSE) {
354 PRINTF("Error: timeout while issue cmd%d\n",i);
355 return FALSE;
356 }
357 }
358 timeout=FDC_TIME_OUT;
359 for(i=0;i<pCMD->resultlen;i++) {
360 while((read_fdc_reg(FDC_MSR)&0xC0)!=0xC0) {
361 timeout--;
362 if(timeout==0) {
363 PRINTF(" timeout while reading result%d MSR=0x%02X\n",i,read_fdc_reg(FDC_MSR));
364 return FALSE;
365 }
366 }
367 pCMD->result[i]=(unsigned char)read_fdc_byte();
368 }
369 return TRUE;
370 }
371
372 /* selects the drive assigned in the cmd structur and
373 switches on the Motor */
374 void select_fdc_drive(FDC_COMMAND_STRUCT *pCMD)
375 {
376 unsigned char val;
377
378 val=(1<<(4+pCMD->drive))|pCMD->drive|0xC; /* set reset, dma gate and motor bits */
379 if((read_fdc_reg(FDC_DOR)&val)!=val) {
380 write_fdc_reg(FDC_DOR,val);
381 for(val=0;val<255;val++)
382 udelay(500); /* wait some time to start motor */
383 }
384 }
385
386 /* switches off the Motor of the specified drive */
387 void stop_fdc_drive(FDC_COMMAND_STRUCT *pCMD)
388 {
389 unsigned char val;
390
391 val=(1<<(4+pCMD->drive))|pCMD->drive; /* sets motor bits */
392 write_fdc_reg(FDC_DOR,(read_fdc_reg(FDC_DOR)&~val));
393 }
394
395 /* issues a recalibrate command, waits for interrupt and
396 * issues a sense_interrupt */
397 int fdc_recalibrate(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
398 {
399 pCMD->cmd[COMMAND]=FDC_CMD_RECALIBRATE;
400 if(fdc_issue_cmd(pCMD,pFG)==FALSE)
401 return FALSE;
402 while(wait_for_fdc_int()!=TRUE);
403 pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
404 return(fdc_issue_cmd(pCMD,pFG));
405 }
406
407 /* issues a recalibrate command, waits for interrupt and
408 * issues a sense_interrupt */
409 int fdc_seek(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
410 {
411 pCMD->cmd[COMMAND]=FDC_CMD_SEEK;
412 if(fdc_issue_cmd(pCMD,pFG)==FALSE)
413 return FALSE;
414 while(wait_for_fdc_int()!=TRUE);
415 pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
416 return(fdc_issue_cmd(pCMD,pFG));
417 }
418
419
420 /* terminates current command, by not servicing the FIFO
421 * waits for interrupt and fills in the result bytes */
422 int fdc_terminate(FDC_COMMAND_STRUCT *pCMD)
423 {
424 int i;
425 for(i=0;i<100;i++)
426 udelay(500); /* wait 500usec for fifo overrun */
427 while((read_fdc_reg(FDC_SRA)&0x80)==0x00); /* wait as long as no int has occured */
428 for(i=0;i<7;i++) {
429 pCMD->result[i]=(unsigned char)read_fdc_byte();
430 }
431 return TRUE;
432 }
433
434 /* reads data from FDC, seek commands are issued automatic */
435 int fdc_read_data(unsigned char *buffer, unsigned long blocks,FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
436 {
437 /* first seek to start address */
438 unsigned long len,lastblk,readblk,i,timeout,ii,offset;
439 unsigned char pcn,c,retriesrw,retriescal;
440 unsigned char *bufferw; /* working buffer */
441 int sect_size;
442 int flags;
443
444 flags=disable_interrupts(); /* switch off all Interrupts */
445 select_fdc_drive(pCMD); /* switch on drive */
446 sect_size=0x080<<pFG->sect_code;
447 retriesrw=0;
448 retriescal=0;
449 offset=0;
450 if(fdc_seek(pCMD,pFG)==FALSE) {
451 stop_fdc_drive(pCMD);
452 enable_interrupts();
453 return FALSE;
454 }
455 if((pCMD->result[STATUS_0]&0x20)!=0x20) {
456 printf("Seek error Status: %02X\n",pCMD->result[STATUS_0]);
457 stop_fdc_drive(pCMD);
458 enable_interrupts();
459 return FALSE;
460 }
461 pcn=pCMD->result[STATUS_PCN]; /* current track */
462 /* now determine the next seek point */
463 lastblk=pCMD->blnr + blocks;
464 /* readblk=(pFG->head*pFG->sect)-(pCMD->blnr%(pFG->head*pFG->sect)); */
465 readblk=pFG->sect-(pCMD->blnr%pFG->sect);
466 PRINTF("1st nr of block possible read %ld start %ld\n",readblk,pCMD->blnr);
467 if(readblk>blocks) /* is end within 1st track */
468 readblk=blocks; /* yes, correct it */
469 PRINTF("we read %ld blocks start %ld\n",readblk,pCMD->blnr);
470 bufferw=&buffer[0]; /* setup working buffer */
471 do {
472 retryrw:
473 len=sect_size * readblk;
474 pCMD->cmd[COMMAND]=FDC_CMD_READ;
475 if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
476 stop_fdc_drive(pCMD);
477 enable_interrupts();
478 return FALSE;
479 }
480 for (i=0;i<len;i++) {
481 timeout=FDC_TIME_OUT;
482 do {
483 c=read_fdc_reg(FDC_MSR);
484 if((c&0xC0)==0xC0) {
485 bufferw[i]=read_fdc_reg(FDC_FIFO);
486 break;
487 }
488 if((c&0xC0)==0x80) { /* output */
489 PRINTF("Transfer error transfered: at %ld, MSR=%02X\n",i,c);
490 if(i>6) {
491 for(ii=0;ii<7;ii++) {
492 pCMD->result[ii]=bufferw[(i-7+ii)];
493 } /* for */
494 }
495 if(retriesrw++>FDC_RW_RETRIES) {
496 if (retriescal++>FDC_CAL_RETRIES) {
497 stop_fdc_drive(pCMD);
498 enable_interrupts();
499 return FALSE;
500 }
501 else {
502 PRINTF(" trying to recalibrate Try %d\n",retriescal);
503 if(fdc_recalibrate(pCMD,pFG)==FALSE) {
504 stop_fdc_drive(pCMD);
505 enable_interrupts();
506 return FALSE;
507 }
508 retriesrw=0;
509 goto retrycal;
510 } /* else >FDC_CAL_RETRIES */
511 }
512 else {
513 PRINTF("Read retry %d\n",retriesrw);
514 goto retryrw;
515 } /* else >FDC_RW_RETRIES */
516 }/* if output */
517 timeout--;
518 }while(TRUE);
519 } /* for len */
520 /* the last sector of a track or all data has been read,
521 * we need to get the results */
522 fdc_terminate(pCMD);
523 offset+=(sect_size*readblk); /* set up buffer pointer */
524 bufferw=&buffer[offset];
525 pCMD->blnr+=readblk; /* update current block nr */
526 blocks-=readblk; /* update blocks */
527 if(blocks==0)
528 break; /* we are finish */
529 /* setup new read blocks */
530 /* readblk=pFG->head*pFG->sect; */
531 readblk=pFG->sect;
532 if(readblk>blocks)
533 readblk=blocks;
534 retrycal:
535 /* a seek is necessary */
536 if(fdc_seek(pCMD,pFG)==FALSE) {
537 stop_fdc_drive(pCMD);
538 enable_interrupts();
539 return FALSE;
540 }
541 if((pCMD->result[STATUS_0]&0x20)!=0x20) {
542 PRINTF("Seek error Status: %02X\n",pCMD->result[STATUS_0]);
543 stop_fdc_drive(pCMD);
544 return FALSE;
545 }
546 pcn=pCMD->result[STATUS_PCN]; /* current track */
547 }while(TRUE); /* start over */
548 stop_fdc_drive(pCMD); /* switch off drive */
549 enable_interrupts();
550 return TRUE;
551 }
552
553 /* Scan all drives and check if drive is present and disk is inserted */
554 int fdc_check_drive(FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
555 {
556 int i,drives,state;
557 /* OK procedure of data book is satisfied.
558 * trying to get some information over the drives */
559 state=0; /* no drives, no disks */
560 for(drives=0;drives<4;drives++) {
561 pCMD->drive=drives;
562 select_fdc_drive(pCMD);
563 pCMD->blnr=0; /* set to the 1st block */
564 if(fdc_recalibrate(pCMD,pFG)==FALSE)
565 continue;
566 if((pCMD->result[STATUS_0]&0x10)==0x10)
567 continue;
568 /* ok drive connected check for disk */
569 state|=(1<<drives);
570 pCMD->blnr=pFG->size; /* set to the last block */
571 if(fdc_seek(pCMD,pFG)==FALSE)
572 continue;
573 pCMD->blnr=0; /* set to the 1st block */
574 if(fdc_recalibrate(pCMD,pFG)==FALSE)
575 continue;
576 pCMD->cmd[COMMAND]=FDC_CMD_READ_ID;
577 if(fdc_issue_cmd(pCMD,pFG)==FALSE)
578 continue;
579 state|=(0x10<<drives);
580 }
581 stop_fdc_drive(pCMD);
582 for(i=0;i<4;i++) {
583 PRINTF("Floppy Drive %d %sconnected %sDisk inserted %s\n",i,
584 ((state&(1<<i))==(1<<i)) ? "":"not ",
585 ((state&(0x10<<i))==(0x10<<i)) ? "":"no ",
586 ((state&(0x10<<i))==(0x10<<i)) ? pFG->name : "");
587 }
588 pCMD->flags=state;
589 return TRUE;
590 }
591
592
593 /**************************************************************************
594 * int fdc_setup
595 * setup the fdc according the datasheet
596 * assuming in PS2 Mode
597 */
598 int fdc_setup(int drive, FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
599 {
600
601 int i;
602
603 #ifdef CFG_FDC_HW_INIT
604 fdc_hw_init ();
605 #endif
606 /* first, we reset the FDC via the DOR */
607 write_fdc_reg(FDC_DOR,0x00);
608 for(i=0; i<255; i++) /* then we wait some time */
609 udelay(500);
610 /* then, we clear the reset in the DOR */
611 pCMD->drive=drive;
612 select_fdc_drive(pCMD);
613 /* initialize the CCR */
614 write_fdc_reg(FDC_CCR,pFG->rate);
615 /* then initialize the DSR */
616 write_fdc_reg(FDC_DSR,pFG->rate);
617 if(wait_for_fdc_int()==FALSE) {
618 PRINTF("Time Out after writing CCR\n");
619 return FALSE;
620 }
621 /* now issue sense Interrupt and status command
622 * assuming only one drive present (drive 0) */
623 pCMD->dma=0; /* we don't use any dma at all */
624 for(i=0;i<4;i++) {
625 /* issue sense interrupt for all 4 possible drives */
626 pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
627 if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
628 PRINTF("Sense Interrupt for drive %d failed\n",i);
629 }
630 }
631 /* issue the configure command */
632 pCMD->drive=drive;
633 select_fdc_drive(pCMD);
634 pCMD->cmd[COMMAND]=FDC_CMD_CONFIGURE;
635 if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
636 PRINTF(" configure timeout\n");
637 stop_fdc_drive(pCMD);
638 return FALSE;
639 }
640 /* issue specify command */
641 pCMD->cmd[COMMAND]=FDC_CMD_SPECIFY;
642 if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
643 PRINTF(" specify timeout\n");
644 stop_fdc_drive(pCMD);
645 return FALSE;
646
647 }
648 /* then, we clear the reset in the DOR */
649 /* fdc_check_drive(pCMD,pFG); */
650 /* write_fdc_reg(FDC_DOR,0x04); */
651 return TRUE;
652 }
653 #endif /* ((CONFIG_COMMANDS & CFG_CMD_FDC)||(CONFIG_COMMANDS & CFG_CMD_FDOS))*/
654
655 #if (CONFIG_COMMANDS & CFG_CMD_FDOS)
656
657 /* Low level functions for the Floppy-DOS layer */
658
659 /**************************************************************************
660 * int fdc_fdos_init
661 * initialize the FDC layer
662 *
663 */
664 int fdc_fdos_init (int drive)
665 {
666 FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
667 FDC_COMMAND_STRUCT *pCMD = &cmd;
668
669 /* setup FDC and scan for drives */
670 if(fdc_setup(drive,pCMD,pFG)==FALSE) {
671 printf("\n** Error in setup FDC **\n");
672 return FALSE;
673 }
674 if(fdc_check_drive(pCMD,pFG)==FALSE) {
675 printf("\n** Error in check_drives **\n");
676 return FALSE;
677 }
678 if((pCMD->flags&(1<<drive))==0) {
679 /* drive not available */
680 printf("\n** Drive %d not available **\n",drive);
681 return FALSE;
682 }
683 if((pCMD->flags&(0x10<<drive))==0) {
684 /* no disk inserted */
685 printf("\n** No disk inserted in drive %d **\n",drive);
686 return FALSE;
687 }
688 /* ok, we have a valid source */
689 pCMD->drive=drive;
690
691 /* read first block */
692 pCMD->blnr=0;
693 return TRUE;
694 }
695 /**************************************************************************
696 * int fdc_fdos_seek
697 * parameter is a block number
698 */
699 int fdc_fdos_seek (int where)
700 {
701 FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
702 FDC_COMMAND_STRUCT *pCMD = &cmd;
703
704 pCMD -> blnr = where ;
705 return (fdc_seek (pCMD, pFG));
706 }
707 /**************************************************************************
708 * int fdc_fdos_read
709 * the length is in block number
710 */
711 int fdc_fdos_read (void *buffer, int len)
712 {
713 FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
714 FDC_COMMAND_STRUCT *pCMD = &cmd;
715
716 return (fdc_read_data (buffer, len, pCMD, pFG));
717 }
718 #endif /* (CONFIG_COMMANDS & CFG_CMD_FDOS) */
719
720 #if (CONFIG_COMMANDS & CFG_CMD_FDC)
721 /****************************************************************************
722 * main routine do_fdcboot
723 */
724 int do_fdcboot (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
725 {
726 FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
727 FDC_COMMAND_STRUCT *pCMD = &cmd;
728 unsigned long addr,imsize;
729 image_header_t *hdr; /* used for fdc boot */
730 unsigned char boot_drive;
731 int i,nrofblk;
732 char *ep;
733 int rcode = 0;
734
735 switch (argc) {
736 case 1:
737 addr = CFG_LOAD_ADDR;
738 boot_drive=CFG_FDC_DRIVE_NUMBER;
739 break;
740 case 2:
741 addr = simple_strtoul(argv[1], NULL, 16);
742 boot_drive=CFG_FDC_DRIVE_NUMBER;
743 break;
744 case 3:
745 addr = simple_strtoul(argv[1], NULL, 16);
746 boot_drive=simple_strtoul(argv[2], NULL, 10);
747 break;
748 default:
749 printf ("Usage:\n%s\n", cmdtp->usage);
750 return 1;
751 }
752 /* setup FDC and scan for drives */
753 if(fdc_setup(boot_drive,pCMD,pFG)==FALSE) {
754 printf("\n** Error in setup FDC **\n");
755 return 1;
756 }
757 if(fdc_check_drive(pCMD,pFG)==FALSE) {
758 printf("\n** Error in check_drives **\n");
759 return 1;
760 }
761 if((pCMD->flags&(1<<boot_drive))==0) {
762 /* drive not available */
763 printf("\n** Drive %d not availabe **\n",boot_drive);
764 return 1;
765 }
766 if((pCMD->flags&(0x10<<boot_drive))==0) {
767 /* no disk inserted */
768 printf("\n** No disk inserted in drive %d **\n",boot_drive);
769 return 1;
770 }
771 /* ok, we have a valid source */
772 pCMD->drive=boot_drive;
773 /* read first block */
774 pCMD->blnr=0;
775 if(fdc_read_data((unsigned char *)addr,1,pCMD,pFG)==FALSE) {
776 printf("\nRead error:");
777 for(i=0;i<7;i++)
778 printf("result%d: 0x%02X\n",i,pCMD->result[i]);
779 return 1;
780 }
781 hdr = (image_header_t *)addr;
782 if (hdr->ih_magic != IH_MAGIC) {
783 printf ("Bad Magic Number\n");
784 return 1;
785 }
786 print_image_hdr(hdr);
787
788 imsize= hdr->ih_size+sizeof(image_header_t);
789 nrofblk=imsize/512;
790 if((imsize%512)>0)
791 nrofblk++;
792 printf("Loading %ld Bytes (%d blocks) at 0x%08lx..\n",imsize,nrofblk,addr);
793 pCMD->blnr=0;
794 if(fdc_read_data((unsigned char *)addr,nrofblk,pCMD,pFG)==FALSE) {
795 /* read image block */
796 printf("\nRead error:");
797 for(i=0;i<7;i++)
798 printf("result%d: 0x%02X\n",i,pCMD->result[i]);
799 return 1;
800 }
801 printf("OK %ld Bytes loaded.\n",imsize);
802
803 flush_cache (addr, imsize);
804 /* Loading ok, update default load address */
805
806 load_addr = addr;
807 if(hdr->ih_type == IH_TYPE_KERNEL) {
808 /* Check if we should attempt an auto-start */
809 if (((ep = getenv("autostart")) != NULL) && (strcmp(ep,"yes") == 0)) {
810 char *local_args[2];
811 extern int do_bootm (cmd_tbl_t *, int, int, char *[]);
812
813 local_args[0] = argv[0];
814 local_args[1] = NULL;
815
816 printf ("Automatic boot of image at addr 0x%08lX ...\n", addr);
817
818 do_bootm (cmdtp, 0, 1, local_args);
819 rcode ++;
820 }
821 }
822 return rcode;
823 }
824
825
826
827 #endif /* CONFIG_COMMANDS & CFG_CMD_FDC */
828
829
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