xref: /openbmc/u-boot/cmd/fdc.c (revision c9e40e65)
1 /*
2  * (C) Copyright 2001
3  * Denis Peter, MPL AG, d.peter@mpl.ch.
4  *
5  * SPDX-License-Identifier:	GPL-2.0+
6  */
7 /*
8  * Floppy Disk support
9  */
10 
11 #include <common.h>
12 #include <config.h>
13 #include <command.h>
14 #include <image.h>
15 
16 
17 #undef	FDC_DEBUG
18 
19 #ifdef	FDC_DEBUG
20 #define	PRINTF(fmt,args...)	printf (fmt ,##args)
21 #else
22 #define PRINTF(fmt,args...)
23 #endif
24 
25 /*#if defined(CONFIG_CMD_DATE) */
26 /*#include <rtc.h> */
27 /*#endif */
28 
29 typedef struct {
30 	int		flags;		/* connected drives ect */
31 	unsigned long	blnr;		/* Logical block nr */
32 	uchar		drive;		/* drive no */
33 	uchar		cmdlen;		/* cmd length */
34 	uchar		cmd[16];	/* cmd desc */
35 	uchar		dma;		/* if > 0 dma enabled */
36 	uchar		result[11];	/* status information */
37 	uchar		resultlen;	/* lenght of result */
38 } FDC_COMMAND_STRUCT;
39 
40 /* flags: only the lower 8bit used:
41  * bit 0 if set drive 0 is present
42  * bit 1 if set drive 1 is present
43  * bit 2 if set drive 2 is present
44  * bit 3 if set drive 3 is present
45  * bit 4 if set disk in drive 0 is inserted
46  * bit 5 if set disk in drive 1 is inserted
47  * bit 6 if set disk in drive 2 is inserted
48  * bit 7 if set disk in drive 4 is inserted
49  */
50 
51 /* cmd indexes */
52 #define COMMAND			0
53 #define DRIVE			1
54 #define CONFIG0			1
55 #define SPEC_HUTSRT		1
56 #define TRACK			2
57 #define CONFIG1			2
58 #define SPEC_HLT		2
59 #define HEAD			3
60 #define CONFIG2			3
61 #define SECTOR			4
62 #define SECTOR_SIZE		5
63 #define LAST_TRACK		6
64 #define GAP			7
65 #define DTL			8
66 /* result indexes */
67 #define STATUS_0		0
68 #define STATUS_PCN		1
69 #define STATUS_1		1
70 #define STATUS_2		2
71 #define STATUS_TRACK		3
72 #define STATUS_HEAD		4
73 #define STATUS_SECT		5
74 #define STATUS_SECT_SIZE	6
75 
76 
77 /* Register addresses */
78 #define FDC_BASE	0x3F0
79 #define FDC_SRA		FDC_BASE + 0	/* Status Register A */
80 #define FDC_SRB		FDC_BASE + 1	/* Status Register B */
81 #define FDC_DOR		FDC_BASE + 2	/* Digital Output Register */
82 #define FDC_TDR		FDC_BASE + 3	/* Tape Drive Register */
83 #define FDC_DSR		FDC_BASE + 4	/* Data rate Register */
84 #define FDC_MSR		FDC_BASE + 4	/* Main Status Register */
85 #define FDC_FIFO	FDC_BASE + 5	/* FIFO */
86 #define FDC_DIR		FDC_BASE + 6	/* Digital Input Register */
87 #define FDC_CCR		FDC_BASE + 7	/* Configuration Control */
88 /* Commands */
89 #define FDC_CMD_SENSE_INT	0x08
90 #define FDC_CMD_CONFIGURE	0x13
91 #define FDC_CMD_SPECIFY		0x03
92 #define FDC_CMD_RECALIBRATE	0x07
93 #define FDC_CMD_READ		0x06
94 #define FDC_CMD_READ_TRACK	0x02
95 #define FDC_CMD_READ_ID		0x0A
96 #define FDC_CMD_DUMP_REG	0x0E
97 #define FDC_CMD_SEEK		0x0F
98 
99 #define FDC_CMD_SENSE_INT_LEN	0x01
100 #define FDC_CMD_CONFIGURE_LEN	0x04
101 #define FDC_CMD_SPECIFY_LEN	0x03
102 #define FDC_CMD_RECALIBRATE_LEN	0x02
103 #define FDC_CMD_READ_LEN	0x09
104 #define FDC_CMD_READ_TRACK_LEN	0x09
105 #define FDC_CMD_READ_ID_LEN	0x02
106 #define FDC_CMD_DUMP_REG_LEN	0x01
107 #define FDC_CMD_SEEK_LEN	0x03
108 
109 #define FDC_FIFO_THR		0x0C
110 #define FDC_FIFO_DIS		0x00
111 #define FDC_IMPLIED_SEEK	0x01
112 #define FDC_POLL_DIS		0x00
113 #define FDC_PRE_TRK		0x00
114 #define FDC_CONFIGURE		FDC_FIFO_THR | (FDC_POLL_DIS<<4) | (FDC_FIFO_DIS<<5) | (FDC_IMPLIED_SEEK << 6)
115 #define FDC_MFM_MODE		0x01 /* MFM enable */
116 #define FDC_SKIP_MODE		0x00 /* skip enable */
117 
118 #define FDC_TIME_OUT 100000 /* time out */
119 #define	FDC_RW_RETRIES		3 /* read write retries */
120 #define FDC_CAL_RETRIES		3 /* calibration and seek retries */
121 
122 
123 /* Disk structure */
124 typedef struct  {
125 	unsigned int size;	/* nr of sectors total */
126 	unsigned int sect;	/* sectors per track */
127 	unsigned int head;	/* nr of heads */
128 	unsigned int track;	/* nr of tracks */
129 	unsigned int stretch;	/* !=0 means double track steps */
130 	unsigned char	gap;	/* gap1 size */
131 	unsigned char	rate;	/* data rate. |= 0x40 for perpendicular */
132 	unsigned char	spec1;	/* stepping rate, head unload time */
133 	unsigned char	fmt_gap;/* gap2 size */
134 	unsigned char hlt;	/* head load time */
135 	unsigned char sect_code;/* Sector Size code */
136 	const char	* name;	/* used only for predefined formats */
137 } FD_GEO_STRUCT;
138 
139 
140 /* supported Floppy types (currently only one) */
141 const static FD_GEO_STRUCT floppy_type[2] = {
142 	{ 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,16,2,"H1440" },	/*  7 1.44MB 3.5"   */
143 	{    0, 0,0, 0,0,0x00,0x00,0x00,0x00, 0,0,NULL    },	/*  end of table    */
144 };
145 
146 static FDC_COMMAND_STRUCT cmd; /* global command struct */
147 
148 /* If the boot drive number is undefined, we assume it's drive 0             */
149 #ifndef CONFIG_SYS_FDC_DRIVE_NUMBER
150 #define CONFIG_SYS_FDC_DRIVE_NUMBER 0
151 #endif
152 
153 /* Hardware access */
154 #ifndef CONFIG_SYS_ISA_IO_STRIDE
155 #define CONFIG_SYS_ISA_IO_STRIDE 1
156 #endif
157 
158 #ifndef CONFIG_SYS_ISA_IO_OFFSET
159 #define CONFIG_SYS_ISA_IO_OFFSET 0
160 #endif
161 
162 /* Supporting Functions */
163 /* reads a Register of the FDC */
164 unsigned char read_fdc_reg(unsigned int addr)
165 {
166 	volatile unsigned char *val =
167 		(volatile unsigned char *)(CONFIG_SYS_ISA_IO_BASE_ADDRESS +
168 					   (addr * CONFIG_SYS_ISA_IO_STRIDE) +
169 					   CONFIG_SYS_ISA_IO_OFFSET);
170 
171 	return val [0];
172 }
173 
174 /* writes a Register of the FDC */
175 void write_fdc_reg(unsigned int addr, unsigned char val)
176 {
177 	volatile unsigned char *tmp =
178 		(volatile unsigned char *)(CONFIG_SYS_ISA_IO_BASE_ADDRESS +
179 					   (addr * CONFIG_SYS_ISA_IO_STRIDE) +
180 					   CONFIG_SYS_ISA_IO_OFFSET);
181 	tmp[0]=val;
182 }
183 
184 /* waits for an interrupt (polling) */
185 int wait_for_fdc_int(void)
186 {
187 	unsigned long timeout;
188 	timeout = FDC_TIME_OUT;
189 	while((read_fdc_reg(FDC_SRA)&0x80)==0) {
190 		timeout--;
191 		udelay(10);
192 		if(timeout==0) /* timeout occurred */
193 			return false;
194 	}
195 	return true;
196 }
197 
198 /* reads a byte from the FIFO of the FDC and checks direction and RQM bit
199    of the MSR. returns -1 if timeout, or byte if ok */
200 int read_fdc_byte(void)
201 {
202 	unsigned long timeout;
203 	timeout = FDC_TIME_OUT;
204 	while((read_fdc_reg(FDC_MSR)&0xC0)!=0xC0) {
205 		/* direction out and ready */
206 		udelay(10);
207 		timeout--;
208 		if(timeout==0) /* timeout occurred */
209 			return -1;
210 	}
211 	return read_fdc_reg(FDC_FIFO);
212 }
213 
214 /* if the direction of the FIFO is wrong, this routine is used to
215    empty the FIFO. Should _not_ be used */
216 int fdc_need_more_output(void)
217 {
218 	unsigned char c;
219 	while((read_fdc_reg(FDC_MSR)&0xC0)==0xC0)	{
220 			c=(unsigned char)read_fdc_byte();
221 			printf("Error: more output: %x\n",c);
222 	}
223 	return true;
224 }
225 
226 
227 /* writes a byte to the FIFO of the FDC and checks direction and RQM bit
228    of the MSR */
229 int write_fdc_byte(unsigned char val)
230 {
231 	unsigned long timeout;
232 	timeout = FDC_TIME_OUT;
233 	while((read_fdc_reg(FDC_MSR)&0xC0)!=0x80) {
234 		/* direction in and ready for byte */
235 		timeout--;
236 		udelay(10);
237 		fdc_need_more_output();
238 		if(timeout==0) /* timeout occurred */
239 			return false;
240 	}
241 	write_fdc_reg(FDC_FIFO,val);
242 	return true;
243 }
244 
245 /* sets up all FDC commands and issues it to the FDC. If
246    the command causes direct results (no Execution Phase)
247    the result is be read as well. */
248 
249 int fdc_issue_cmd(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
250 {
251 	int i;
252 	unsigned long head,track,sect,timeout;
253 	track = pCMD->blnr / (pFG->sect * pFG->head); /* track nr */
254 	sect =  pCMD->blnr % (pFG->sect * pFG->head); /* remaining blocks */
255 	head = sect / pFG->sect; /* head nr */
256 	sect =  sect % pFG->sect; /* remaining blocks */
257 	sect++; /* sectors are 1 based */
258 	PRINTF("Cmd 0x%02x Track %ld, Head %ld, Sector %ld, Drive %d (blnr %ld)\n",
259 		pCMD->cmd[0],track,head,sect,pCMD->drive,pCMD->blnr);
260 
261 	if(head|=0) { /* max heads = 2 */
262 		pCMD->cmd[DRIVE]=pCMD->drive | 0x04; /* head 1 */
263 		pCMD->cmd[HEAD]=(unsigned char) head; /* head register */
264 	}
265 	else {
266 		pCMD->cmd[DRIVE]=pCMD->drive; /* head 0 */
267 		pCMD->cmd[HEAD]=(unsigned char) head; /* head register */
268 	}
269 	pCMD->cmd[TRACK]=(unsigned char) track; /* track */
270 	switch (pCMD->cmd[COMMAND]) {
271 		case FDC_CMD_READ:
272 			pCMD->cmd[SECTOR]=(unsigned char) sect; /* sector */
273 			pCMD->cmd[SECTOR_SIZE]=pFG->sect_code; /* sector size code */
274 			pCMD->cmd[LAST_TRACK]=pFG->sect; /* End of track */
275 			pCMD->cmd[GAP]=pFG->gap; /* gap */
276 			pCMD->cmd[DTL]=0xFF; /* DTL */
277 			pCMD->cmdlen=FDC_CMD_READ_LEN;
278 			pCMD->cmd[COMMAND]|=(FDC_MFM_MODE<<6); /* set MFM bit */
279 			pCMD->cmd[COMMAND]|=(FDC_SKIP_MODE<<5); /* set Skip bit */
280 			pCMD->resultlen=0;  /* result only after execution */
281 			break;
282 		case FDC_CMD_SEEK:
283 			pCMD->cmdlen=FDC_CMD_SEEK_LEN;
284 			pCMD->resultlen=0;  /* no result */
285 			break;
286 		case FDC_CMD_CONFIGURE:
287 			pCMD->cmd[CONFIG0]=0;
288 			pCMD->cmd[CONFIG1]=FDC_CONFIGURE; /* FIFO Threshold, Poll, Enable FIFO */
289 			pCMD->cmd[CONFIG2]=FDC_PRE_TRK;	/* Precompensation Track */
290 			pCMD->cmdlen=FDC_CMD_CONFIGURE_LEN;
291 			pCMD->resultlen=0;  /* no result */
292 			break;
293 		case FDC_CMD_SPECIFY:
294 			pCMD->cmd[SPEC_HUTSRT]=pFG->spec1;
295 			pCMD->cmd[SPEC_HLT]=(pFG->hlt)<<1; /* head load time */
296 			if(pCMD->dma==0)
297 				pCMD->cmd[SPEC_HLT]|=0x1; /* no dma */
298 			pCMD->cmdlen=FDC_CMD_SPECIFY_LEN;
299 			pCMD->resultlen=0;  /* no result */
300 			break;
301 		case FDC_CMD_DUMP_REG:
302 			pCMD->cmdlen=FDC_CMD_DUMP_REG_LEN;
303 			pCMD->resultlen=10;  /* 10 byte result */
304 			break;
305 		case FDC_CMD_READ_ID:
306 			pCMD->cmd[COMMAND]|=(FDC_MFM_MODE<<6); /* set MFM bit */
307 			pCMD->cmdlen=FDC_CMD_READ_ID_LEN;
308 			pCMD->resultlen=7;  /* 7 byte result */
309 			break;
310 		case FDC_CMD_RECALIBRATE:
311 			pCMD->cmd[DRIVE]&=0x03; /* don't set the head bit */
312 			pCMD->cmdlen=FDC_CMD_RECALIBRATE_LEN;
313 			pCMD->resultlen=0;  /* no result */
314 			break;
315 			break;
316 		case FDC_CMD_SENSE_INT:
317 			pCMD->cmdlen=FDC_CMD_SENSE_INT_LEN;
318 			pCMD->resultlen=2;
319 			break;
320 	}
321 	for(i=0;i<pCMD->cmdlen;i++) {
322 		/* PRINTF("write cmd%d = 0x%02X\n",i,pCMD->cmd[i]); */
323 		if (write_fdc_byte(pCMD->cmd[i]) == false) {
324 			PRINTF("Error: timeout while issue cmd%d\n",i);
325 			return false;
326 		}
327 	}
328 	timeout=FDC_TIME_OUT;
329 	for(i=0;i<pCMD->resultlen;i++) {
330 		while((read_fdc_reg(FDC_MSR)&0xC0)!=0xC0) {
331 			timeout--;
332 			if(timeout==0) {
333 				PRINTF(" timeout while reading result%d MSR=0x%02X\n",i,read_fdc_reg(FDC_MSR));
334 				return false;
335 			}
336 		}
337 		pCMD->result[i]=(unsigned char)read_fdc_byte();
338 	}
339 	return true;
340 }
341 
342 /* selects the drive assigned in the cmd structur and
343    switches on the Motor */
344 void select_fdc_drive(FDC_COMMAND_STRUCT *pCMD)
345 {
346 	unsigned char val;
347 
348 	val=(1<<(4+pCMD->drive))|pCMD->drive|0xC; /* set reset, dma gate and motor bits */
349 	if((read_fdc_reg(FDC_DOR)&val)!=val) {
350 		write_fdc_reg(FDC_DOR,val);
351 		for(val=0;val<255;val++)
352 			udelay(500); /* wait some time to start motor */
353 	}
354 }
355 
356 /* switches off the Motor of the specified drive */
357 void stop_fdc_drive(FDC_COMMAND_STRUCT *pCMD)
358 {
359 	unsigned char val;
360 
361 	val=(1<<(4+pCMD->drive))|pCMD->drive; /* sets motor bits */
362 	write_fdc_reg(FDC_DOR,(read_fdc_reg(FDC_DOR)&~val));
363 }
364 
365 /* issues a recalibrate command, waits for interrupt and
366  * issues a sense_interrupt */
367 int fdc_recalibrate(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
368 {
369 	pCMD->cmd[COMMAND]=FDC_CMD_RECALIBRATE;
370 	if (fdc_issue_cmd(pCMD, pFG) == false)
371 		return false;
372 	while (wait_for_fdc_int() != true);
373 
374 	pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
375 	return(fdc_issue_cmd(pCMD,pFG));
376 }
377 
378 /* issues a recalibrate command, waits for interrupt and
379  * issues a sense_interrupt */
380 int fdc_seek(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
381 {
382 	pCMD->cmd[COMMAND]=FDC_CMD_SEEK;
383 	if (fdc_issue_cmd(pCMD, pFG) == false)
384 		return false;
385 	while (wait_for_fdc_int() != true);
386 
387 	pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
388 	return(fdc_issue_cmd(pCMD,pFG));
389 }
390 
391 /* terminates current command, by not servicing the FIFO
392  * waits for interrupt and fills in the result bytes */
393 int fdc_terminate(FDC_COMMAND_STRUCT *pCMD)
394 {
395 	int i;
396 	for(i=0;i<100;i++)
397 		udelay(500); /* wait 500usec for fifo overrun */
398 	while((read_fdc_reg(FDC_SRA)&0x80)==0x00); /* wait as long as no int has occurred */
399 	for(i=0;i<7;i++) {
400 		pCMD->result[i]=(unsigned char)read_fdc_byte();
401 	}
402 	return true;
403 }
404 
405 /* reads data from FDC, seek commands are issued automatic */
406 int fdc_read_data(unsigned char *buffer, unsigned long blocks,FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
407 {
408   /* first seek to start address */
409 	unsigned long len,readblk,i,timeout,ii,offset;
410 	unsigned char c,retriesrw,retriescal;
411 	unsigned char *bufferw; /* working buffer */
412 	int sect_size;
413 	int flags;
414 
415 	flags=disable_interrupts(); /* switch off all Interrupts */
416 	select_fdc_drive(pCMD); /* switch on drive */
417 	sect_size=0x080<<pFG->sect_code;
418 	retriesrw=0;
419 	retriescal=0;
420 	offset=0;
421 	if (fdc_seek(pCMD, pFG) == false) {
422 		stop_fdc_drive(pCMD);
423 		if (flags)
424 			enable_interrupts();
425 		return false;
426 	}
427 	if((pCMD->result[STATUS_0]&0x20)!=0x20) {
428 		printf("Seek error Status: %02X\n",pCMD->result[STATUS_0]);
429 		stop_fdc_drive(pCMD);
430 		if (flags)
431 			enable_interrupts();
432 		return false;
433 	}
434 	/* now determine the next seek point */
435 	/*	lastblk=pCMD->blnr + blocks; */
436 	/*	readblk=(pFG->head*pFG->sect)-(pCMD->blnr%(pFG->head*pFG->sect)); */
437 	readblk=pFG->sect-(pCMD->blnr%pFG->sect);
438 	PRINTF("1st nr of block possible read %ld start %ld\n",readblk,pCMD->blnr);
439 	if(readblk>blocks) /* is end within 1st track */
440 		readblk=blocks; /* yes, correct it */
441 	PRINTF("we read %ld blocks start %ld\n",readblk,pCMD->blnr);
442 	bufferw = &buffer[0]; /* setup working buffer */
443 	do {
444 retryrw:
445 		len=sect_size * readblk;
446 		pCMD->cmd[COMMAND]=FDC_CMD_READ;
447 		if (fdc_issue_cmd(pCMD, pFG) == false) {
448 			stop_fdc_drive(pCMD);
449 			if (flags)
450 				enable_interrupts();
451 			return false;
452 		}
453 		for (i=0;i<len;i++) {
454 			timeout=FDC_TIME_OUT;
455 			do {
456 				c=read_fdc_reg(FDC_MSR);
457 				if((c&0xC0)==0xC0) {
458 					bufferw[i]=read_fdc_reg(FDC_FIFO);
459 					break;
460 				}
461 				if((c&0xC0)==0x80) { /* output */
462 					PRINTF("Transfer error transferred: at %ld, MSR=%02X\n",i,c);
463 					if(i>6) {
464 						for(ii=0;ii<7;ii++) {
465 							pCMD->result[ii]=bufferw[(i-7+ii)];
466 						} /* for */
467 					}
468 					if(retriesrw++>FDC_RW_RETRIES) {
469 						if (retriescal++>FDC_CAL_RETRIES) {
470 							stop_fdc_drive(pCMD);
471 							if (flags)
472 								enable_interrupts();
473 							return false;
474 						}
475 						else {
476 							PRINTF(" trying to recalibrate Try %d\n",retriescal);
477 							if (fdc_recalibrate(pCMD, pFG) == false) {
478 								stop_fdc_drive(pCMD);
479 								if (flags)
480 									enable_interrupts();
481 								return false;
482 							}
483 							retriesrw=0;
484 							goto retrycal;
485 						} /* else >FDC_CAL_RETRIES */
486 					}
487 					else {
488 						PRINTF("Read retry %d\n",retriesrw);
489 						goto retryrw;
490 					} /* else >FDC_RW_RETRIES */
491 				}/* if output */
492 				timeout--;
493 			} while (true);
494 		} /* for len */
495 		/* the last sector of a track or all data has been read,
496 		 * we need to get the results */
497 		fdc_terminate(pCMD);
498 		offset+=(sect_size*readblk); /* set up buffer pointer */
499 		bufferw = &buffer[offset];
500 		pCMD->blnr+=readblk; /* update current block nr */
501 		blocks-=readblk; /* update blocks */
502 		if(blocks==0)
503 			break; /* we are finish */
504 		/* setup new read blocks */
505 		/*	readblk=pFG->head*pFG->sect; */
506 		readblk=pFG->sect;
507 		if(readblk>blocks)
508 			readblk=blocks;
509 retrycal:
510 		/* a seek is necessary */
511 		if (fdc_seek(pCMD, pFG) == false) {
512 			stop_fdc_drive(pCMD);
513 			if (flags)
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 	} while (true); /* start over */
523 	stop_fdc_drive(pCMD); /* switch off drive */
524 	if (flags)
525 		enable_interrupts();
526 	return true;
527 }
528 
529 /* Scan all drives and check if drive is present and disk is inserted */
530 int 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 			continue;
542 		if((pCMD->result[STATUS_0]&0x10)==0x10)
543 			continue;
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 			continue;
549 		pCMD->blnr=0; /* set to the 1st block */
550 		if (fdc_recalibrate(pCMD, pFG) == false)
551 			continue;
552 		pCMD->cmd[COMMAND]=FDC_CMD_READ_ID;
553 		if (fdc_issue_cmd(pCMD, pFG) == false)
554 			continue;
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 */
574 int fdc_setup(int drive, FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
575 {
576 	int i;
577 
578 #ifdef CONFIG_SYS_FDC_HW_INIT
579 	fdc_hw_init ();
580 #endif
581 	/* first, we reset the FDC via the DOR */
582 	write_fdc_reg(FDC_DOR,0x00);
583 	for(i=0; i<255; i++) /* then we wait some time */
584 		udelay(500);
585 	/* then, we clear the reset in the DOR */
586 	pCMD->drive=drive;
587 	select_fdc_drive(pCMD);
588 	/* initialize the CCR */
589 	write_fdc_reg(FDC_CCR,pFG->rate);
590 	/* then initialize the DSR */
591 	write_fdc_reg(FDC_DSR,pFG->rate);
592 	if (wait_for_fdc_int() == false) {
593 			PRINTF("Time Out after writing CCR\n");
594 			return false;
595 	}
596 	/* now issue sense Interrupt and status command
597 	 * assuming only one drive present (drive 0) */
598 	pCMD->dma=0; /* we don't use any dma at all */
599 	for(i=0;i<4;i++) {
600 		/* issue sense interrupt for all 4 possible drives */
601 		pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
602 		if (fdc_issue_cmd(pCMD, pFG) == false) {
603 			PRINTF("Sense Interrupt for drive %d failed\n",i);
604 		}
605 	}
606 	/* issue the configure command */
607 	pCMD->drive=drive;
608 	select_fdc_drive(pCMD);
609 	pCMD->cmd[COMMAND]=FDC_CMD_CONFIGURE;
610 	if (fdc_issue_cmd(pCMD, pFG) == false) {
611 		PRINTF(" configure timeout\n");
612 		stop_fdc_drive(pCMD);
613 		return false;
614 	}
615 	/* issue specify command */
616 	pCMD->cmd[COMMAND]=FDC_CMD_SPECIFY;
617 	if (fdc_issue_cmd(pCMD, pFG) == false) {
618 		PRINTF(" specify timeout\n");
619 		stop_fdc_drive(pCMD);
620 		return false;
621 
622 	}
623 	/* then, we clear the reset in the DOR */
624 	/* fdc_check_drive(pCMD,pFG);	*/
625 	/*	write_fdc_reg(FDC_DOR,0x04); */
626 
627 	return true;
628 }
629 
630 /****************************************************************************
631  * main routine do_fdcboot
632  */
633 int do_fdcboot (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
634 {
635 	FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
636 	FDC_COMMAND_STRUCT *pCMD = &cmd;
637 	unsigned long addr,imsize;
638 #if defined(CONFIG_IMAGE_FORMAT_LEGACY)
639 	image_header_t *hdr;  /* used for fdc boot */
640 #endif
641 	unsigned char boot_drive;
642 	int i,nrofblk;
643 #if defined(CONFIG_FIT)
644 	const void *fit_hdr = NULL;
645 #endif
646 
647 	switch (argc) {
648 	case 1:
649 		addr = CONFIG_SYS_LOAD_ADDR;
650 		boot_drive=CONFIG_SYS_FDC_DRIVE_NUMBER;
651 		break;
652 	case 2:
653 		addr = simple_strtoul(argv[1], NULL, 16);
654 		boot_drive=CONFIG_SYS_FDC_DRIVE_NUMBER;
655 		break;
656 	case 3:
657 		addr = simple_strtoul(argv[1], NULL, 16);
658 		boot_drive=simple_strtoul(argv[2], NULL, 10);
659 		break;
660 	default:
661 		return CMD_RET_USAGE;
662 	}
663 	/* setup FDC and scan for drives  */
664 	if (fdc_setup(boot_drive, pCMD, pFG) == false) {
665 		printf("\n** Error in setup FDC **\n");
666 		return 1;
667 	}
668 	if (fdc_check_drive(pCMD, pFG) == false) {
669 		printf("\n** Error in check_drives **\n");
670 		return 1;
671 	}
672 	if((pCMD->flags&(1<<boot_drive))==0) {
673 		/* drive not available */
674 		printf("\n** Drive %d not availabe **\n",boot_drive);
675 		return 1;
676 	}
677 	if((pCMD->flags&(0x10<<boot_drive))==0) {
678 		/* no disk inserted */
679 		printf("\n** No disk inserted in drive %d **\n",boot_drive);
680 		return 1;
681 	}
682 	/* ok, we have a valid source */
683 	pCMD->drive=boot_drive;
684 	/* read first block */
685 	pCMD->blnr=0;
686 	if (fdc_read_data((unsigned char *)addr, 1, pCMD, pFG) == false) {
687 		printf("\nRead error:");
688 		for(i=0;i<7;i++)
689 			printf("result%d: 0x%02X\n",i,pCMD->result[i]);
690 		return 1;
691 	}
692 
693 	switch (genimg_get_format ((void *)addr)) {
694 #if defined(CONFIG_IMAGE_FORMAT_LEGACY)
695 	case IMAGE_FORMAT_LEGACY:
696 		hdr = (image_header_t *)addr;
697 		image_print_contents (hdr);
698 
699 		imsize = image_get_image_size (hdr);
700 		break;
701 #endif
702 #if defined(CONFIG_FIT)
703 	case IMAGE_FORMAT_FIT:
704 		fit_hdr = (const void *)addr;
705 		puts ("Fit image detected...\n");
706 
707 		imsize = fit_get_size (fit_hdr);
708 		break;
709 #endif
710 	default:
711 		puts ("** Unknown image type\n");
712 		return 1;
713 	}
714 
715 	nrofblk=imsize/512;
716 	if((imsize%512)>0)
717 		nrofblk++;
718 	printf("Loading %ld Bytes (%d blocks) at 0x%08lx..\n",imsize,nrofblk,addr);
719 	pCMD->blnr=0;
720 	if (fdc_read_data((unsigned char *)addr, nrofblk, pCMD, pFG) == false) {
721 		/* read image block */
722 		printf("\nRead error:");
723 		for(i=0;i<7;i++)
724 			printf("result%d: 0x%02X\n",i,pCMD->result[i]);
725 		return 1;
726 	}
727 	printf("OK %ld Bytes loaded.\n",imsize);
728 
729 	flush_cache (addr, imsize);
730 
731 #if defined(CONFIG_FIT)
732 	/* This cannot be done earlier, we need complete FIT image in RAM first */
733 	if (genimg_get_format ((void *)addr) == IMAGE_FORMAT_FIT) {
734 		if (!fit_check_format (fit_hdr)) {
735 			puts ("** Bad FIT image format\n");
736 			return 1;
737 		}
738 		fit_print_contents (fit_hdr);
739 	}
740 #endif
741 
742 	/* Loading ok, update default load address */
743 	load_addr = addr;
744 
745 	return bootm_maybe_autostart(cmdtp, argv[0]);
746 }
747 
748 U_BOOT_CMD(
749 	fdcboot,	3,	1,	do_fdcboot,
750 	"boot from floppy device",
751 	"loadAddr drive"
752 );
753