summaryrefslogtreecommitdiffstats
path: root/common/cmd_fdc.c
blob: 98b3c4c0014901444291c4bddd9e9282a38bf9ce (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
/*
 * (C) Copyright 2001
 * Denis Peter, MPL AG, d.peter@mpl.ch.
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */
/*
 * Floppy Disk support
 */

#include <common.h>
#include <config.h>
#include <command.h>
#include <image.h>


#undef	FDC_DEBUG

#ifdef	FDC_DEBUG
#define	PRINTF(fmt,args...)	printf (fmt ,##args)
#else
#define PRINTF(fmt,args...)
#endif

/*#if defined(CONFIG_CMD_DATE) */
/*#include <rtc.h> */
/*#endif */

typedef struct {
	int		flags;		/* connected drives ect */
	unsigned long	blnr;		/* Logical block nr */
	uchar		drive;		/* drive no */
	uchar		cmdlen;		/* cmd length */
	uchar		cmd[16];	/* cmd desc */
	uchar		dma;		/* if > 0 dma enabled */
	uchar		result[11];	/* status information */
	uchar		resultlen;	/* lenght of result */
} FDC_COMMAND_STRUCT;

/* flags: only the lower 8bit used:
 * bit 0 if set drive 0 is present
 * bit 1 if set drive 1 is present
 * bit 2 if set drive 2 is present
 * bit 3 if set drive 3 is present
 * bit 4 if set disk in drive 0 is inserted
 * bit 5 if set disk in drive 1 is inserted
 * bit 6 if set disk in drive 2 is inserted
 * bit 7 if set disk in drive 4 is inserted
 */

/* cmd indexes */
#define COMMAND			0
#define DRIVE			1
#define CONFIG0			1
#define SPEC_HUTSRT		1
#define TRACK			2
#define CONFIG1			2
#define SPEC_HLT		2
#define HEAD			3
#define CONFIG2			3
#define SECTOR			4
#define SECTOR_SIZE		5
#define LAST_TRACK		6
#define GAP			7
#define DTL			8
/* result indexes */
#define STATUS_0		0
#define STATUS_PCN		1
#define STATUS_1		1
#define STATUS_2		2
#define STATUS_TRACK		3
#define STATUS_HEAD		4
#define STATUS_SECT		5
#define STATUS_SECT_SIZE	6


/* Register addresses */
#define FDC_BASE	0x3F0
#define FDC_SRA		FDC_BASE + 0	/* Status Register A */
#define FDC_SRB		FDC_BASE + 1	/* Status Register B */
#define FDC_DOR		FDC_BASE + 2	/* Digital Output Register */
#define FDC_TDR		FDC_BASE + 3	/* Tape Drive Register */
#define FDC_DSR		FDC_BASE + 4	/* Data rate Register */
#define FDC_MSR		FDC_BASE + 4	/* Main Status Register */
#define FDC_FIFO	FDC_BASE + 5	/* FIFO */
#define FDC_DIR		FDC_BASE + 6	/* Digital Input Register */
#define FDC_CCR		FDC_BASE + 7	/* Configuration Control */
/* Commands */
#define FDC_CMD_SENSE_INT	0x08
#define FDC_CMD_CONFIGURE	0x13
#define FDC_CMD_SPECIFY		0x03
#define FDC_CMD_RECALIBRATE	0x07
#define FDC_CMD_READ		0x06
#define FDC_CMD_READ_TRACK	0x02
#define FDC_CMD_READ_ID		0x0A
#define FDC_CMD_DUMP_REG	0x0E
#define FDC_CMD_SEEK		0x0F

#define FDC_CMD_SENSE_INT_LEN	0x01
#define FDC_CMD_CONFIGURE_LEN	0x04
#define FDC_CMD_SPECIFY_LEN	0x03
#define FDC_CMD_RECALIBRATE_LEN	0x02
#define FDC_CMD_READ_LEN	0x09
#define FDC_CMD_READ_TRACK_LEN	0x09
#define FDC_CMD_READ_ID_LEN	0x02
#define FDC_CMD_DUMP_REG_LEN	0x01
#define FDC_CMD_SEEK_LEN	0x03

#define FDC_FIFO_THR		0x0C
#define FDC_FIFO_DIS		0x00
#define FDC_IMPLIED_SEEK	0x01
#define FDC_POLL_DIS		0x00
#define FDC_PRE_TRK		0x00
#define FDC_CONFIGURE		FDC_FIFO_THR | (FDC_POLL_DIS<<4) | (FDC_FIFO_DIS<<5) | (FDC_IMPLIED_SEEK << 6)
#define FDC_MFM_MODE		0x01 /* MFM enable */
#define FDC_SKIP_MODE		0x00 /* skip enable */

#define FDC_TIME_OUT 100000 /* time out */
#define	FDC_RW_RETRIES		3 /* read write retries */
#define FDC_CAL_RETRIES		3 /* calibration and seek retries */


/* Disk structure */
typedef struct  {
	unsigned int size;	/* nr of sectors total */
	unsigned int sect;	/* sectors per track */
	unsigned int head;	/* nr of heads */
	unsigned int track;	/* nr of tracks */
	unsigned int stretch;	/* !=0 means double track steps */
	unsigned char	gap;	/* gap1 size */
	unsigned char	rate;	/* data rate. |= 0x40 for perpendicular */
	unsigned char	spec1;	/* stepping rate, head unload time */
	unsigned char	fmt_gap;/* gap2 size */
	unsigned char hlt;	/* head load time */
	unsigned char sect_code;/* Sector Size code */
	const char	* name;	/* used only for predefined formats */
} FD_GEO_STRUCT;


/* supported Floppy types (currently only one) */
const static FD_GEO_STRUCT floppy_type[2] = {
	{ 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,16,2,"H1440" },	/*  7 1.44MB 3.5"   */
	{    0, 0,0, 0,0,0x00,0x00,0x00,0x00, 0,0,NULL    },	/*  end of table    */
};

static FDC_COMMAND_STRUCT cmd; /* global command struct */

/* If the boot drive number is undefined, we assume it's drive 0             */
#ifndef CONFIG_SYS_FDC_DRIVE_NUMBER
#define CONFIG_SYS_FDC_DRIVE_NUMBER 0
#endif

/* Hardware access */
#ifndef CONFIG_SYS_ISA_IO_STRIDE
#define CONFIG_SYS_ISA_IO_STRIDE 1
#endif

#ifndef CONFIG_SYS_ISA_IO_OFFSET
#define CONFIG_SYS_ISA_IO_OFFSET 0
#endif

/* Supporting Functions */
/* reads a Register of the FDC */
unsigned char read_fdc_reg(unsigned int addr)
{
	volatile unsigned char *val =
		(volatile unsigned char *)(CONFIG_SYS_ISA_IO_BASE_ADDRESS +
					   (addr * CONFIG_SYS_ISA_IO_STRIDE) +
					   CONFIG_SYS_ISA_IO_OFFSET);

	return val [0];
}

/* writes a Register of the FDC */
void write_fdc_reg(unsigned int addr, unsigned char val)
{
	volatile unsigned char *tmp =
		(volatile unsigned char *)(CONFIG_SYS_ISA_IO_BASE_ADDRESS +
					   (addr * CONFIG_SYS_ISA_IO_STRIDE) +
					   CONFIG_SYS_ISA_IO_OFFSET);
	tmp[0]=val;
}

/* waits for an interrupt (polling) */
int wait_for_fdc_int(void)
{
	unsigned long timeout;
	timeout = FDC_TIME_OUT;
	while((read_fdc_reg(FDC_SRA)&0x80)==0) {
		timeout--;
		udelay(10);
		if(timeout==0) /* timeout occured */
			return false;
	}
	return true;
}

/* reads a byte from the FIFO of the FDC and checks direction and RQM bit
   of the MSR. returns -1 if timeout, or byte if ok */
int read_fdc_byte(void)
{
	unsigned long timeout;
	timeout = FDC_TIME_OUT;
	while((read_fdc_reg(FDC_MSR)&0xC0)!=0xC0) {
		/* direction out and ready */
		udelay(10);
		timeout--;
		if(timeout==0) /* timeout occured */
			return -1;
	}
	return read_fdc_reg(FDC_FIFO);
}

/* if the direction of the FIFO is wrong, this routine is used to
   empty the FIFO. Should _not_ be used */
int fdc_need_more_output(void)
{
	unsigned char c;
	while((read_fdc_reg(FDC_MSR)&0xC0)==0xC0)	{
			c=(unsigned char)read_fdc_byte();
			printf("Error: more output: %x\n",c);
	}
	return true;
}


/* writes a byte to the FIFO of the FDC and checks direction and RQM bit
   of the MSR */
int write_fdc_byte(unsigned char val)
{
	unsigned long timeout;
	timeout = FDC_TIME_OUT;
	while((read_fdc_reg(FDC_MSR)&0xC0)!=0x80) {
		/* direction in and ready for byte */
		timeout--;
		udelay(10);
		fdc_need_more_output();
		if(timeout==0) /* timeout occured */
			return false;
	}
	write_fdc_reg(FDC_FIFO,val);
	return true;
}

/* sets up all FDC commands and issues it to the FDC. If
   the command causes direct results (no Execution Phase)
   the result is be read as well. */

int fdc_issue_cmd(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
{
	int i;
	unsigned long head,track,sect,timeout;
	track = pCMD->blnr / (pFG->sect * pFG->head); /* track nr */
	sect =  pCMD->blnr % (pFG->sect * pFG->head); /* remaining blocks */
	head = sect / pFG->sect; /* head nr */
	sect =  sect % pFG->sect; /* remaining blocks */
	sect++; /* sectors are 1 based */
	PRINTF("Cmd 0x%02x Track %ld, Head %ld, Sector %ld, Drive %d (blnr %ld)\n",
		pCMD->cmd[0],track,head,sect,pCMD->drive,pCMD->blnr);

	if(head|=0) { /* max heads = 2 */
		pCMD->cmd[DRIVE]=pCMD->drive | 0x04; /* head 1 */
		pCMD->cmd[HEAD]=(unsigned char) head; /* head register */
	}
	else {
		pCMD->cmd[DRIVE]=pCMD->drive; /* head 0 */
		pCMD->cmd[HEAD]=(unsigned char) head; /* head register */
	}
	pCMD->cmd[TRACK]=(unsigned char) track; /* track */
	switch (pCMD->cmd[COMMAND]) {
		case FDC_CMD_READ:
			pCMD->cmd[SECTOR]=(unsigned char) sect; /* sector */
			pCMD->cmd[SECTOR_SIZE]=pFG->sect_code; /* sector size code */
			pCMD->cmd[LAST_TRACK]=pFG->sect; /* End of track */
			pCMD->cmd[GAP]=pFG->gap; /* gap */
			pCMD->cmd[DTL]=0xFF; /* DTL */
			pCMD->cmdlen=FDC_CMD_READ_LEN;
			pCMD->cmd[COMMAND]|=(FDC_MFM_MODE<<6); /* set MFM bit */
			pCMD->cmd[COMMAND]|=(FDC_SKIP_MODE<<5); /* set Skip bit */
			pCMD->resultlen=0;  /* result only after execution */
			break;
		case FDC_CMD_SEEK:
			pCMD->cmdlen=FDC_CMD_SEEK_LEN;
			pCMD->resultlen=0;  /* no result */
			break;
		case FDC_CMD_CONFIGURE:
			pCMD->cmd[CONFIG0]=0;
			pCMD->cmd[CONFIG1]=FDC_CONFIGURE; /* FIFO Threshold, Poll, Enable FIFO */
			pCMD->cmd[CONFIG2]=FDC_PRE_TRK;	/* Precompensation Track */
			pCMD->cmdlen=FDC_CMD_CONFIGURE_LEN;
			pCMD->resultlen=0;  /* no result */
			break;
		case FDC_CMD_SPECIFY:
			pCMD->cmd[SPEC_HUTSRT]=pFG->spec1;
			pCMD->cmd[SPEC_HLT]=(pFG->hlt)<<1; /* head load time */
			if(pCMD->dma==0)
				pCMD->cmd[SPEC_HLT]|=0x1; /* no dma */
			pCMD->cmdlen=FDC_CMD_SPECIFY_LEN;
			pCMD->resultlen=0;  /* no result */
			break;
		case FDC_CMD_DUMP_REG:
			pCMD->cmdlen=FDC_CMD_DUMP_REG_LEN;
			pCMD->resultlen=10;  /* 10 byte result */
			break;
		case FDC_CMD_READ_ID:
			pCMD->cmd[COMMAND]|=(FDC_MFM_MODE<<6); /* set MFM bit */
			pCMD->cmdlen=FDC_CMD_READ_ID_LEN;
			pCMD->resultlen=7;  /* 7 byte result */
			break;
		case FDC_CMD_RECALIBRATE:
			pCMD->cmd[DRIVE]&=0x03; /* don't set the head bit */
			pCMD->cmdlen=FDC_CMD_RECALIBRATE_LEN;
			pCMD->resultlen=0;  /* no result */
			break;
			break;
		case FDC_CMD_SENSE_INT:
			pCMD->cmdlen=FDC_CMD_SENSE_INT_LEN;
			pCMD->resultlen=2;
			break;
	}
	for(i=0;i<pCMD->cmdlen;i++) {
		/* PRINTF("write cmd%d = 0x%02X\n",i,pCMD->cmd[i]); */
		if (write_fdc_byte(pCMD->cmd[i]) == false) {
			PRINTF("Error: timeout while issue cmd%d\n",i);
			return false;
		}
	}
	timeout=FDC_TIME_OUT;
	for(i=0;i<pCMD->resultlen;i++) {
		while((read_fdc_reg(FDC_MSR)&0xC0)!=0xC0) {
			timeout--;
			if(timeout==0) {
				PRINTF(" timeout while reading result%d MSR=0x%02X\n",i,read_fdc_reg(FDC_MSR));
				return false;
			}
		}
		pCMD->result[i]=(unsigned char)read_fdc_byte();
	}
	return true;
}

/* selects the drive assigned in the cmd structur and
   switches on the Motor */
void select_fdc_drive(FDC_COMMAND_STRUCT *pCMD)
{
	unsigned char val;

	val=(1<<(4+pCMD->drive))|pCMD->drive|0xC; /* set reset, dma gate and motor bits */
	if((read_fdc_reg(FDC_DOR)&val)!=val) {
		write_fdc_reg(FDC_DOR,val);
		for(val=0;val<255;val++)
			udelay(500); /* wait some time to start motor */
	}
}

/* switches off the Motor of the specified drive */
void stop_fdc_drive(FDC_COMMAND_STRUCT *pCMD)
{
	unsigned char val;

	val=(1<<(4+pCMD->drive))|pCMD->drive; /* sets motor bits */
	write_fdc_reg(FDC_DOR,(read_fdc_reg(FDC_DOR)&~val));
}

/* issues a recalibrate command, waits for interrupt and
 * issues a sense_interrupt */
int fdc_recalibrate(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
{
	pCMD->cmd[COMMAND]=FDC_CMD_RECALIBRATE;
	if (fdc_issue_cmd(pCMD, pFG) == false)
		return false;
	while (wait_for_fdc_int() != true);

	pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
	return(fdc_issue_cmd(pCMD,pFG));
}

/* issues a recalibrate command, waits for interrupt and
 * issues a sense_interrupt */
int fdc_seek(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
{
	pCMD->cmd[COMMAND]=FDC_CMD_SEEK;
	if (fdc_issue_cmd(pCMD, pFG) == false)
		return false;
	while (wait_for_fdc_int() != true);

	pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
	return(fdc_issue_cmd(pCMD,pFG));
}

/* terminates current command, by not servicing the FIFO
 * waits for interrupt and fills in the result bytes */
int fdc_terminate(FDC_COMMAND_STRUCT *pCMD)
{
	int i;
	for(i=0;i<100;i++)
		udelay(500); /* wait 500usec for fifo overrun */
	while((read_fdc_reg(FDC_SRA)&0x80)==0x00); /* wait as long as no int has occured */
	for(i=0;i<7;i++) {
		pCMD->result[i]=(unsigned char)read_fdc_byte();
	}
	return true;
}

/* reads data from FDC, seek commands are issued automatic */
int fdc_read_data(unsigned char *buffer, unsigned long blocks,FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
{
  /* first seek to start address */
	unsigned long len,readblk,i,timeout,ii,offset;
	unsigned char c,retriesrw,retriescal;
	unsigned char *bufferw; /* working buffer */
	int sect_size;
	int flags;

	flags=disable_interrupts(); /* switch off all Interrupts */
	select_fdc_drive(pCMD); /* switch on drive */
	sect_size=0x080<<pFG->sect_code;
	retriesrw=0;
	retriescal=0;
	offset=0;
	if (fdc_seek(pCMD, pFG) == false) {
		stop_fdc_drive(pCMD);
		if (flags)
			enable_interrupts();
		return false;
	}
	if((pCMD->result[STATUS_0]&0x20)!=0x20) {
		printf("Seek error Status: %02X\n",pCMD->result[STATUS_0]);
		stop_fdc_drive(pCMD);
		if (flags)
			enable_interrupts();
		return false;
	}
	/* now determine the next seek point */
	/*	lastblk=pCMD->blnr + blocks; */
	/*	readblk=(pFG->head*pFG->sect)-(pCMD->blnr%(pFG->head*pFG->sect)); */
	readblk=pFG->sect-(pCMD->blnr%pFG->sect);
	PRINTF("1st nr of block possible read %ld start %ld\n",readblk,pCMD->blnr);
	if(readblk>blocks) /* is end within 1st track */
		readblk=blocks; /* yes, correct it */
	PRINTF("we read %ld blocks start %ld\n",readblk,pCMD->blnr);
	bufferw = &buffer[0]; /* setup working buffer */
	do {
retryrw:
		len=sect_size * readblk;
		pCMD->cmd[COMMAND]=FDC_CMD_READ;
		if (fdc_issue_cmd(pCMD, pFG) == false) {
			stop_fdc_drive(pCMD);
			if (flags)
				enable_interrupts();
			return false;
		}
		for (i=0;i<len;i++) {
			timeout=FDC_TIME_OUT;
			do {
				c=read_fdc_reg(FDC_MSR);
				if((c&0xC0)==0xC0) {
					bufferw[i]=read_fdc_reg(FDC_FIFO);
					break;
				}
				if((c&0xC0)==0x80) { /* output */
					PRINTF("Transfer error transfered: at %ld, MSR=%02X\n",i,c);
					if(i>6) {
						for(ii=0;ii<7;ii++) {
							pCMD->result[ii]=bufferw[(i-7+ii)];
						} /* for */
					}
					if(retriesrw++>FDC_RW_RETRIES) {
						if (retriescal++>FDC_CAL_RETRIES) {
							stop_fdc_drive(pCMD);
							if (flags)
								enable_interrupts();
							return false;
						}
						else {
							PRINTF(" trying to recalibrate Try %d\n",retriescal);
							if (fdc_recalibrate(pCMD, pFG) == false) {
								stop_fdc_drive(pCMD);
								if (flags)
									enable_interrupts();
								return false;
							}
							retriesrw=0;
							goto retrycal;
						} /* else >FDC_CAL_RETRIES */
					}
					else {
						PRINTF("Read retry %d\n",retriesrw);
						goto retryrw;
					} /* else >FDC_RW_RETRIES */
				}/* if output */
				timeout--;
			} while (true);
		} /* for len */
		/* the last sector of a track or all data has been read,
		 * we need to get the results */
		fdc_terminate(pCMD);
		offset+=(sect_size*readblk); /* set up buffer pointer */
		bufferw = &buffer[offset];
		pCMD->blnr+=readblk; /* update current block nr */
		blocks-=readblk; /* update blocks */
		if(blocks==0)
			break; /* we are finish */
		/* setup new read blocks */
		/*	readblk=pFG->head*pFG->sect; */
		readblk=pFG->sect;
		if(readblk>blocks)
			readblk=blocks;
retrycal:
		/* a seek is necessary */
		if (fdc_seek(pCMD, pFG) == false) {
			stop_fdc_drive(pCMD);
			if (flags)
				enable_interrupts();
			return false;
		}
		if((pCMD->result[STATUS_0]&0x20)!=0x20) {
			PRINTF("Seek error Status: %02X\n",pCMD->result[STATUS_0]);
			stop_fdc_drive(pCMD);
			return false;
		}
	} while (true); /* start over */
	stop_fdc_drive(pCMD); /* switch off drive */
	if (flags)
		enable_interrupts();
	return true;
}

/* Scan all drives and check if drive is present and disk is inserted */
int fdc_check_drive(FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
{
	int i,drives,state;
  /* OK procedure of data book is satisfied.
	 * trying to get some information over the drives */
	state=0; /* no drives, no disks */
	for(drives=0;drives<4;drives++) {
		pCMD->drive=drives;
		select_fdc_drive(pCMD);
		pCMD->blnr=0; /* set to the 1st block */
		if (fdc_recalibrate(pCMD, pFG) == false)
			continue;
		if((pCMD->result[STATUS_0]&0x10)==0x10)
			continue;
		/* ok drive connected check for disk */
		state|=(1<<drives);
		pCMD->blnr=pFG->size; /* set to the last block */
		if (fdc_seek(pCMD, pFG) == false)
			continue;
		pCMD->blnr=0; /* set to the 1st block */
		if (fdc_recalibrate(pCMD, pFG) == false)
			continue;
		pCMD->cmd[COMMAND]=FDC_CMD_READ_ID;
		if (fdc_issue_cmd(pCMD, pFG) == false)
			continue;
		state|=(0x10<<drives);
	}
	stop_fdc_drive(pCMD);
	for(i=0;i<4;i++) {
		PRINTF("Floppy Drive %d %sconnected %sDisk inserted %s\n",i,
			((state&(1<<i))==(1<<i)) ? "":"not ",
			((state&(0x10<<i))==(0x10<<i)) ? "":"no ",
			((state&(0x10<<i))==(0x10<<i)) ? pFG->name : "");
	}
	pCMD->flags=state;
	return true;
}


/**************************************************************************
* int fdc_setup
* setup the fdc according the datasheet
* assuming in PS2 Mode
*/
int fdc_setup(int drive, FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
{
	int i;

#ifdef CONFIG_SYS_FDC_HW_INIT
	fdc_hw_init ();
#endif
	/* first, we reset the FDC via the DOR */
	write_fdc_reg(FDC_DOR,0x00);
	for(i=0; i<255; i++) /* then we wait some time */
		udelay(500);
	/* then, we clear the reset in the DOR */
	pCMD->drive=drive;
	select_fdc_drive(pCMD);
	/* initialize the CCR */
	write_fdc_reg(FDC_CCR,pFG->rate);
	/* then initialize the DSR */
	write_fdc_reg(FDC_DSR,pFG->rate);
	if (wait_for_fdc_int() == false) {
			PRINTF("Time Out after writing CCR\n");
			return false;
	}
	/* now issue sense Interrupt and status command
	 * assuming only one drive present (drive 0) */
	pCMD->dma=0; /* we don't use any dma at all */
	for(i=0;i<4;i++) {
		/* issue sense interrupt for all 4 possible drives */
		pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
		if (fdc_issue_cmd(pCMD, pFG) == false) {
			PRINTF("Sense Interrupt for drive %d failed\n",i);
		}
	}
	/* issue the configure command */
	pCMD->drive=drive;
	select_fdc_drive(pCMD);
	pCMD->cmd[COMMAND]=FDC_CMD_CONFIGURE;
	if (fdc_issue_cmd(pCMD, pFG) == false) {
		PRINTF(" configure timeout\n");
		stop_fdc_drive(pCMD);
		return false;
	}
	/* issue specify command */
	pCMD->cmd[COMMAND]=FDC_CMD_SPECIFY;
	if (fdc_issue_cmd(pCMD, pFG) == false) {
		PRINTF(" specify timeout\n");
		stop_fdc_drive(pCMD);
		return false;

	}
	/* then, we clear the reset in the DOR */
	/* fdc_check_drive(pCMD,pFG);	*/
	/*	write_fdc_reg(FDC_DOR,0x04); */

	return true;
}

#if defined(CONFIG_CMD_FDOS)

/* Low level functions for the Floppy-DOS layer                              */

/**************************************************************************
* int fdc_fdos_init
* initialize the FDC layer
*
*/
int fdc_fdos_init (int drive)
{
	FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
	FDC_COMMAND_STRUCT *pCMD = &cmd;

	/* setup FDC and scan for drives  */
	if (fdc_setup(drive, pCMD, pFG) == false) {
		printf("\n** Error in setup FDC **\n");
		return false;
	}
	if (fdc_check_drive(pCMD, pFG) == false) {
		printf("\n** Error in check_drives **\n");
		return false;
	}
	if((pCMD->flags&(1<<drive))==0) {
		/* drive not available */
		printf("\n** Drive %d not available **\n",drive);
		return false;
	}
	if((pCMD->flags&(0x10<<drive))==0) {
		/* no disk inserted */
		printf("\n** No disk inserted in drive %d **\n",drive);
		return false;
	}
	/* ok, we have a valid source */
	pCMD->drive=drive;

	/* read first block */
	pCMD->blnr=0;
	return true;
}
/**************************************************************************
* int fdc_fdos_seek
* parameter is a block number
*/
int fdc_fdos_seek (int where)
{
	FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
	FDC_COMMAND_STRUCT *pCMD = &cmd;

	pCMD -> blnr = where ;
	return (fdc_seek (pCMD, pFG));
}
/**************************************************************************
* int fdc_fdos_read
*  the length is in block number
*/
int fdc_fdos_read (void *buffer, int len)
{
	FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
	FDC_COMMAND_STRUCT *pCMD = &cmd;

	return (fdc_read_data (buffer, len, pCMD, pFG));
}
#endif

#if defined(CONFIG_CMD_FDC)
/****************************************************************************
 * main routine do_fdcboot
 */
int do_fdcboot (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
	FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
	FDC_COMMAND_STRUCT *pCMD = &cmd;
	unsigned long addr,imsize;
	image_header_t *hdr;  /* used for fdc boot */
	unsigned char boot_drive;
	int i,nrofblk;
#if defined(CONFIG_FIT)
	const void *fit_hdr = NULL;
#endif

	switch (argc) {
	case 1:
		addr = CONFIG_SYS_LOAD_ADDR;
		boot_drive=CONFIG_SYS_FDC_DRIVE_NUMBER;
		break;
	case 2:
		addr = simple_strtoul(argv[1], NULL, 16);
		boot_drive=CONFIG_SYS_FDC_DRIVE_NUMBER;
		break;
	case 3:
		addr = simple_strtoul(argv[1], NULL, 16);
		boot_drive=simple_strtoul(argv[2], NULL, 10);
		break;
	default:
		return CMD_RET_USAGE;
	}
	/* setup FDC and scan for drives  */
	if (fdc_setup(boot_drive, pCMD, pFG) == false) {
		printf("\n** Error in setup FDC **\n");
		return 1;
	}
	if (fdc_check_drive(pCMD, pFG) == false) {
		printf("\n** Error in check_drives **\n");
		return 1;
	}
	if((pCMD->flags&(1<<boot_drive))==0) {
		/* drive not available */
		printf("\n** Drive %d not availabe **\n",boot_drive);
		return 1;
	}
	if((pCMD->flags&(0x10<<boot_drive))==0) {
		/* no disk inserted */
		printf("\n** No disk inserted in drive %d **\n",boot_drive);
		return 1;
	}
	/* ok, we have a valid source */
	pCMD->drive=boot_drive;
	/* read first block */
	pCMD->blnr=0;
	if (fdc_read_data((unsigned char *)addr, 1, pCMD, pFG) == false) {
		printf("\nRead error:");
		for(i=0;i<7;i++)
			printf("result%d: 0x%02X\n",i,pCMD->result[i]);
		return 1;
	}

	switch (genimg_get_format ((void *)addr)) {
	case IMAGE_FORMAT_LEGACY:
		hdr = (image_header_t *)addr;
		image_print_contents (hdr);

		imsize = image_get_image_size (hdr);
		break;
#if defined(CONFIG_FIT)
	case IMAGE_FORMAT_FIT:
		fit_hdr = (const void *)addr;
		puts ("Fit image detected...\n");

		imsize = fit_get_size (fit_hdr);
		break;
#endif
	default:
		puts ("** Unknown image type\n");
		return 1;
	}

	nrofblk=imsize/512;
	if((imsize%512)>0)
		nrofblk++;
	printf("Loading %ld Bytes (%d blocks) at 0x%08lx..\n",imsize,nrofblk,addr);
	pCMD->blnr=0;
	if (fdc_read_data((unsigned char *)addr, nrofblk, pCMD, pFG) == false) {
		/* read image block */
		printf("\nRead error:");
		for(i=0;i<7;i++)
			printf("result%d: 0x%02X\n",i,pCMD->result[i]);
		return 1;
	}
	printf("OK %ld Bytes loaded.\n",imsize);

	flush_cache (addr, imsize);

#if defined(CONFIG_FIT)
	/* This cannot be done earlier, we need complete FIT image in RAM first */
	if (genimg_get_format ((void *)addr) == IMAGE_FORMAT_FIT) {
		if (!fit_check_format (fit_hdr)) {
			puts ("** Bad FIT image format\n");
			return 1;
		}
		fit_print_contents (fit_hdr);
	}
#endif

	/* Loading ok, update default load address */
	load_addr = addr;

	return bootm_maybe_autostart(cmdtp, argv[0]);
}

U_BOOT_CMD(
	fdcboot,	3,	1,	do_fdcboot,
	"boot from floppy device",
	"loadAddr drive"
);
#endif
OpenPOWER on IntegriCloud