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1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * (C) Copyright 2001
4  * Denis Peter, MPL AG, d.peter@mpl.ch.
5  */
6 /*
7  * Floppy Disk support
8  */
9 
10 #include <common.h>
11 #include <config.h>
12 #include <command.h>
13 #include <image.h>
14 
15 
16 #undef	FDC_DEBUG
17 
18 #ifdef	FDC_DEBUG
19 #define	PRINTF(fmt,args...)	printf (fmt ,##args)
20 #else
21 #define PRINTF(fmt,args...)
22 #endif
23 
24 /*#if defined(CONFIG_CMD_DATE) */
25 /*#include <rtc.h> */
26 /*#endif */
27 
28 typedef struct {
29 	int		flags;		/* connected drives ect */
30 	unsigned long	blnr;		/* Logical block nr */
31 	uchar		drive;		/* drive no */
32 	uchar		cmdlen;		/* cmd length */
33 	uchar		cmd[16];	/* cmd desc */
34 	uchar		dma;		/* if > 0 dma enabled */
35 	uchar		result[11];	/* status information */
36 	uchar		resultlen;	/* lenght of result */
37 } FDC_COMMAND_STRUCT;
38 
39 /* flags: only the lower 8bit used:
40  * bit 0 if set drive 0 is present
41  * bit 1 if set drive 1 is present
42  * bit 2 if set drive 2 is present
43  * bit 3 if set drive 3 is present
44  * bit 4 if set disk in drive 0 is inserted
45  * bit 5 if set disk in drive 1 is inserted
46  * bit 6 if set disk in drive 2 is inserted
47  * bit 7 if set disk in drive 4 is inserted
48  */
49 
50 /* cmd indexes */
51 #define COMMAND			0
52 #define DRIVE			1
53 #define CONFIG0			1
54 #define SPEC_HUTSRT		1
55 #define TRACK			2
56 #define CONFIG1			2
57 #define SPEC_HLT		2
58 #define HEAD			3
59 #define CONFIG2			3
60 #define SECTOR			4
61 #define SECTOR_SIZE		5
62 #define LAST_TRACK		6
63 #define GAP			7
64 #define DTL			8
65 /* result indexes */
66 #define STATUS_0		0
67 #define STATUS_PCN		1
68 #define STATUS_1		1
69 #define STATUS_2		2
70 #define STATUS_TRACK		3
71 #define STATUS_HEAD		4
72 #define STATUS_SECT		5
73 #define STATUS_SECT_SIZE	6
74 
75 
76 /* Register addresses */
77 #define FDC_BASE	0x3F0
78 #define FDC_SRA		FDC_BASE + 0	/* Status Register A */
79 #define FDC_SRB		FDC_BASE + 1	/* Status Register B */
80 #define FDC_DOR		FDC_BASE + 2	/* Digital Output Register */
81 #define FDC_TDR		FDC_BASE + 3	/* Tape Drive Register */
82 #define FDC_DSR		FDC_BASE + 4	/* Data rate Register */
83 #define FDC_MSR		FDC_BASE + 4	/* Main Status Register */
84 #define FDC_FIFO	FDC_BASE + 5	/* FIFO */
85 #define FDC_DIR		FDC_BASE + 6	/* Digital Input Register */
86 #define FDC_CCR		FDC_BASE + 7	/* Configuration Control */
87 /* Commands */
88 #define FDC_CMD_SENSE_INT	0x08
89 #define FDC_CMD_CONFIGURE	0x13
90 #define FDC_CMD_SPECIFY		0x03
91 #define FDC_CMD_RECALIBRATE	0x07
92 #define FDC_CMD_READ		0x06
93 #define FDC_CMD_READ_TRACK	0x02
94 #define FDC_CMD_READ_ID		0x0A
95 #define FDC_CMD_DUMP_REG	0x0E
96 #define FDC_CMD_SEEK		0x0F
97 
98 #define FDC_CMD_SENSE_INT_LEN	0x01
99 #define FDC_CMD_CONFIGURE_LEN	0x04
100 #define FDC_CMD_SPECIFY_LEN	0x03
101 #define FDC_CMD_RECALIBRATE_LEN	0x02
102 #define FDC_CMD_READ_LEN	0x09
103 #define FDC_CMD_READ_TRACK_LEN	0x09
104 #define FDC_CMD_READ_ID_LEN	0x02
105 #define FDC_CMD_DUMP_REG_LEN	0x01
106 #define FDC_CMD_SEEK_LEN	0x03
107 
108 #define FDC_FIFO_THR		0x0C
109 #define FDC_FIFO_DIS		0x00
110 #define FDC_IMPLIED_SEEK	0x01
111 #define FDC_POLL_DIS		0x00
112 #define FDC_PRE_TRK		0x00
113 #define FDC_CONFIGURE		FDC_FIFO_THR | (FDC_POLL_DIS<<4) | (FDC_FIFO_DIS<<5) | (FDC_IMPLIED_SEEK << 6)
114 #define FDC_MFM_MODE		0x01 /* MFM enable */
115 #define FDC_SKIP_MODE		0x00 /* skip enable */
116 
117 #define FDC_TIME_OUT 100000 /* time out */
118 #define	FDC_RW_RETRIES		3 /* read write retries */
119 #define FDC_CAL_RETRIES		3 /* calibration and seek retries */
120 
121 
122 /* Disk structure */
123 typedef struct  {
124 	unsigned int size;	/* nr of sectors total */
125 	unsigned int sect;	/* sectors per track */
126 	unsigned int head;	/* nr of heads */
127 	unsigned int track;	/* nr of tracks */
128 	unsigned int stretch;	/* !=0 means double track steps */
129 	unsigned char	gap;	/* gap1 size */
130 	unsigned char	rate;	/* data rate. |= 0x40 for perpendicular */
131 	unsigned char	spec1;	/* stepping rate, head unload time */
132 	unsigned char	fmt_gap;/* gap2 size */
133 	unsigned char hlt;	/* head load time */
134 	unsigned char sect_code;/* Sector Size code */
135 	const char	* name;	/* used only for predefined formats */
136 } FD_GEO_STRUCT;
137 
138 
139 /* supported Floppy types (currently only one) */
140 const static FD_GEO_STRUCT floppy_type[2] = {
141 	{ 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,16,2,"H1440" },	/*  7 1.44MB 3.5"   */
142 	{    0, 0,0, 0,0,0x00,0x00,0x00,0x00, 0,0,NULL    },	/*  end of table    */
143 };
144 
145 static FDC_COMMAND_STRUCT cmd; /* global command struct */
146 
147 /* If the boot drive number is undefined, we assume it's drive 0             */
148 #ifndef CONFIG_SYS_FDC_DRIVE_NUMBER
149 #define CONFIG_SYS_FDC_DRIVE_NUMBER 0
150 #endif
151 
152 /* Hardware access */
153 #ifndef CONFIG_SYS_ISA_IO_STRIDE
154 #define CONFIG_SYS_ISA_IO_STRIDE 1
155 #endif
156 
157 #ifndef CONFIG_SYS_ISA_IO_OFFSET
158 #define CONFIG_SYS_ISA_IO_OFFSET 0
159 #endif
160 
161 /* Supporting Functions */
162 /* reads a Register of the FDC */
read_fdc_reg(unsigned int addr)163 unsigned char read_fdc_reg(unsigned int addr)
164 {
165 	volatile unsigned char *val =
166 		(volatile unsigned char *)(CONFIG_SYS_ISA_IO_BASE_ADDRESS +
167 					   (addr * CONFIG_SYS_ISA_IO_STRIDE) +
168 					   CONFIG_SYS_ISA_IO_OFFSET);
169 
170 	return val [0];
171 }
172 
173 /* writes a Register of the FDC */
write_fdc_reg(unsigned int addr,unsigned char val)174 void write_fdc_reg(unsigned int addr, unsigned char val)
175 {
176 	volatile unsigned char *tmp =
177 		(volatile unsigned char *)(CONFIG_SYS_ISA_IO_BASE_ADDRESS +
178 					   (addr * CONFIG_SYS_ISA_IO_STRIDE) +
179 					   CONFIG_SYS_ISA_IO_OFFSET);
180 	tmp[0]=val;
181 }
182 
183 /* waits for an interrupt (polling) */
wait_for_fdc_int(void)184 int wait_for_fdc_int(void)
185 {
186 	unsigned long timeout;
187 	timeout = FDC_TIME_OUT;
188 	while((read_fdc_reg(FDC_SRA)&0x80)==0) {
189 		timeout--;
190 		udelay(10);
191 		if(timeout==0) /* timeout occurred */
192 			return false;
193 	}
194 	return true;
195 }
196 
197 /* reads a byte from the FIFO of the FDC and checks direction and RQM bit
198    of the MSR. returns -1 if timeout, or byte if ok */
read_fdc_byte(void)199 int read_fdc_byte(void)
200 {
201 	unsigned long timeout;
202 	timeout = FDC_TIME_OUT;
203 	while((read_fdc_reg(FDC_MSR)&0xC0)!=0xC0) {
204 		/* direction out and ready */
205 		udelay(10);
206 		timeout--;
207 		if(timeout==0) /* timeout occurred */
208 			return -1;
209 	}
210 	return read_fdc_reg(FDC_FIFO);
211 }
212 
213 /* if the direction of the FIFO is wrong, this routine is used to
214    empty the FIFO. Should _not_ be used */
fdc_need_more_output(void)215 int fdc_need_more_output(void)
216 {
217 	unsigned char c;
218 	while((read_fdc_reg(FDC_MSR)&0xC0)==0xC0)	{
219 			c=(unsigned char)read_fdc_byte();
220 			printf("Error: more output: %x\n",c);
221 	}
222 	return true;
223 }
224 
225 
226 /* writes a byte to the FIFO of the FDC and checks direction and RQM bit
227    of the MSR */
write_fdc_byte(unsigned char val)228 int write_fdc_byte(unsigned char val)
229 {
230 	unsigned long timeout;
231 	timeout = FDC_TIME_OUT;
232 	while((read_fdc_reg(FDC_MSR)&0xC0)!=0x80) {
233 		/* direction in and ready for byte */
234 		timeout--;
235 		udelay(10);
236 		fdc_need_more_output();
237 		if(timeout==0) /* timeout occurred */
238 			return false;
239 	}
240 	write_fdc_reg(FDC_FIFO,val);
241 	return true;
242 }
243 
244 /* sets up all FDC commands and issues it to the FDC. If
245    the command causes direct results (no Execution Phase)
246    the result is be read as well. */
247 
fdc_issue_cmd(FDC_COMMAND_STRUCT * pCMD,FD_GEO_STRUCT * pFG)248 int fdc_issue_cmd(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
249 {
250 	int i;
251 	unsigned long head,track,sect,timeout;
252 	track = pCMD->blnr / (pFG->sect * pFG->head); /* track nr */
253 	sect =  pCMD->blnr % (pFG->sect * pFG->head); /* remaining blocks */
254 	head = sect / pFG->sect; /* head nr */
255 	sect =  sect % pFG->sect; /* remaining blocks */
256 	sect++; /* sectors are 1 based */
257 	PRINTF("Cmd 0x%02x Track %ld, Head %ld, Sector %ld, Drive %d (blnr %ld)\n",
258 		pCMD->cmd[0],track,head,sect,pCMD->drive,pCMD->blnr);
259 
260 	if(head|=0) { /* max heads = 2 */
261 		pCMD->cmd[DRIVE]=pCMD->drive | 0x04; /* head 1 */
262 		pCMD->cmd[HEAD]=(unsigned char) head; /* head register */
263 	}
264 	else {
265 		pCMD->cmd[DRIVE]=pCMD->drive; /* head 0 */
266 		pCMD->cmd[HEAD]=(unsigned char) head; /* head register */
267 	}
268 	pCMD->cmd[TRACK]=(unsigned char) track; /* track */
269 	switch (pCMD->cmd[COMMAND]) {
270 		case FDC_CMD_READ:
271 			pCMD->cmd[SECTOR]=(unsigned char) sect; /* sector */
272 			pCMD->cmd[SECTOR_SIZE]=pFG->sect_code; /* sector size code */
273 			pCMD->cmd[LAST_TRACK]=pFG->sect; /* End of track */
274 			pCMD->cmd[GAP]=pFG->gap; /* gap */
275 			pCMD->cmd[DTL]=0xFF; /* DTL */
276 			pCMD->cmdlen=FDC_CMD_READ_LEN;
277 			pCMD->cmd[COMMAND]|=(FDC_MFM_MODE<<6); /* set MFM bit */
278 			pCMD->cmd[COMMAND]|=(FDC_SKIP_MODE<<5); /* set Skip bit */
279 			pCMD->resultlen=0;  /* result only after execution */
280 			break;
281 		case FDC_CMD_SEEK:
282 			pCMD->cmdlen=FDC_CMD_SEEK_LEN;
283 			pCMD->resultlen=0;  /* no result */
284 			break;
285 		case FDC_CMD_CONFIGURE:
286 			pCMD->cmd[CONFIG0]=0;
287 			pCMD->cmd[CONFIG1]=FDC_CONFIGURE; /* FIFO Threshold, Poll, Enable FIFO */
288 			pCMD->cmd[CONFIG2]=FDC_PRE_TRK;	/* Precompensation Track */
289 			pCMD->cmdlen=FDC_CMD_CONFIGURE_LEN;
290 			pCMD->resultlen=0;  /* no result */
291 			break;
292 		case FDC_CMD_SPECIFY:
293 			pCMD->cmd[SPEC_HUTSRT]=pFG->spec1;
294 			pCMD->cmd[SPEC_HLT]=(pFG->hlt)<<1; /* head load time */
295 			if(pCMD->dma==0)
296 				pCMD->cmd[SPEC_HLT]|=0x1; /* no dma */
297 			pCMD->cmdlen=FDC_CMD_SPECIFY_LEN;
298 			pCMD->resultlen=0;  /* no result */
299 			break;
300 		case FDC_CMD_DUMP_REG:
301 			pCMD->cmdlen=FDC_CMD_DUMP_REG_LEN;
302 			pCMD->resultlen=10;  /* 10 byte result */
303 			break;
304 		case FDC_CMD_READ_ID:
305 			pCMD->cmd[COMMAND]|=(FDC_MFM_MODE<<6); /* set MFM bit */
306 			pCMD->cmdlen=FDC_CMD_READ_ID_LEN;
307 			pCMD->resultlen=7;  /* 7 byte result */
308 			break;
309 		case FDC_CMD_RECALIBRATE:
310 			pCMD->cmd[DRIVE]&=0x03; /* don't set the head bit */
311 			pCMD->cmdlen=FDC_CMD_RECALIBRATE_LEN;
312 			pCMD->resultlen=0;  /* no result */
313 			break;
314 			break;
315 		case FDC_CMD_SENSE_INT:
316 			pCMD->cmdlen=FDC_CMD_SENSE_INT_LEN;
317 			pCMD->resultlen=2;
318 			break;
319 	}
320 	for(i=0;i<pCMD->cmdlen;i++) {
321 		/* PRINTF("write cmd%d = 0x%02X\n",i,pCMD->cmd[i]); */
322 		if (write_fdc_byte(pCMD->cmd[i]) == false) {
323 			PRINTF("Error: timeout while issue cmd%d\n",i);
324 			return false;
325 		}
326 	}
327 	timeout=FDC_TIME_OUT;
328 	for(i=0;i<pCMD->resultlen;i++) {
329 		while((read_fdc_reg(FDC_MSR)&0xC0)!=0xC0) {
330 			timeout--;
331 			if(timeout==0) {
332 				PRINTF(" timeout while reading result%d MSR=0x%02X\n",i,read_fdc_reg(FDC_MSR));
333 				return false;
334 			}
335 		}
336 		pCMD->result[i]=(unsigned char)read_fdc_byte();
337 	}
338 	return true;
339 }
340 
341 /* selects the drive assigned in the cmd structur and
342    switches on the Motor */
select_fdc_drive(FDC_COMMAND_STRUCT * pCMD)343 void select_fdc_drive(FDC_COMMAND_STRUCT *pCMD)
344 {
345 	unsigned char val;
346 
347 	val=(1<<(4+pCMD->drive))|pCMD->drive|0xC; /* set reset, dma gate and motor bits */
348 	if((read_fdc_reg(FDC_DOR)&val)!=val) {
349 		write_fdc_reg(FDC_DOR,val);
350 		for(val=0;val<255;val++)
351 			udelay(500); /* wait some time to start motor */
352 	}
353 }
354 
355 /* switches off the Motor of the specified drive */
stop_fdc_drive(FDC_COMMAND_STRUCT * pCMD)356 void stop_fdc_drive(FDC_COMMAND_STRUCT *pCMD)
357 {
358 	unsigned char val;
359 
360 	val=(1<<(4+pCMD->drive))|pCMD->drive; /* sets motor bits */
361 	write_fdc_reg(FDC_DOR,(read_fdc_reg(FDC_DOR)&~val));
362 }
363 
364 /* issues a recalibrate command, waits for interrupt and
365  * issues a sense_interrupt */
fdc_recalibrate(FDC_COMMAND_STRUCT * pCMD,FD_GEO_STRUCT * pFG)366 int fdc_recalibrate(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
367 {
368 	pCMD->cmd[COMMAND]=FDC_CMD_RECALIBRATE;
369 	if (fdc_issue_cmd(pCMD, pFG) == false)
370 		return false;
371 	while (wait_for_fdc_int() != true);
372 
373 	pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
374 	return(fdc_issue_cmd(pCMD,pFG));
375 }
376 
377 /* issues a recalibrate command, waits for interrupt and
378  * issues a sense_interrupt */
fdc_seek(FDC_COMMAND_STRUCT * pCMD,FD_GEO_STRUCT * pFG)379 int fdc_seek(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
380 {
381 	pCMD->cmd[COMMAND]=FDC_CMD_SEEK;
382 	if (fdc_issue_cmd(pCMD, pFG) == false)
383 		return false;
384 	while (wait_for_fdc_int() != true);
385 
386 	pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
387 	return(fdc_issue_cmd(pCMD,pFG));
388 }
389 
390 /* terminates current command, by not servicing the FIFO
391  * waits for interrupt and fills in the result bytes */
fdc_terminate(FDC_COMMAND_STRUCT * pCMD)392 int fdc_terminate(FDC_COMMAND_STRUCT *pCMD)
393 {
394 	int i;
395 	for(i=0;i<100;i++)
396 		udelay(500); /* wait 500usec for fifo overrun */
397 	while((read_fdc_reg(FDC_SRA)&0x80)==0x00); /* wait as long as no int has occurred */
398 	for(i=0;i<7;i++) {
399 		pCMD->result[i]=(unsigned char)read_fdc_byte();
400 	}
401 	return true;
402 }
403 
404 /* reads data from FDC, seek commands are issued automatic */
fdc_read_data(unsigned char * buffer,unsigned long blocks,FDC_COMMAND_STRUCT * pCMD,FD_GEO_STRUCT * pFG)405 int fdc_read_data(unsigned char *buffer, unsigned long blocks,FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
406 {
407   /* first seek to start address */
408 	unsigned long len,readblk,i,timeout,ii,offset;
409 	unsigned char c,retriesrw,retriescal;
410 	unsigned char *bufferw; /* working buffer */
411 	int sect_size;
412 	int flags;
413 
414 	flags=disable_interrupts(); /* switch off all Interrupts */
415 	select_fdc_drive(pCMD); /* switch on drive */
416 	sect_size=0x080<<pFG->sect_code;
417 	retriesrw=0;
418 	retriescal=0;
419 	offset=0;
420 	if (fdc_seek(pCMD, pFG) == false) {
421 		stop_fdc_drive(pCMD);
422 		if (flags)
423 			enable_interrupts();
424 		return false;
425 	}
426 	if((pCMD->result[STATUS_0]&0x20)!=0x20) {
427 		printf("Seek error Status: %02X\n",pCMD->result[STATUS_0]);
428 		stop_fdc_drive(pCMD);
429 		if (flags)
430 			enable_interrupts();
431 		return false;
432 	}
433 	/* now determine the next seek point */
434 	/*	lastblk=pCMD->blnr + blocks; */
435 	/*	readblk=(pFG->head*pFG->sect)-(pCMD->blnr%(pFG->head*pFG->sect)); */
436 	readblk=pFG->sect-(pCMD->blnr%pFG->sect);
437 	PRINTF("1st nr of block possible read %ld start %ld\n",readblk,pCMD->blnr);
438 	if(readblk>blocks) /* is end within 1st track */
439 		readblk=blocks; /* yes, correct it */
440 	PRINTF("we read %ld blocks start %ld\n",readblk,pCMD->blnr);
441 	bufferw = &buffer[0]; /* setup working buffer */
442 	do {
443 retryrw:
444 		len=sect_size * readblk;
445 		pCMD->cmd[COMMAND]=FDC_CMD_READ;
446 		if (fdc_issue_cmd(pCMD, pFG) == false) {
447 			stop_fdc_drive(pCMD);
448 			if (flags)
449 				enable_interrupts();
450 			return false;
451 		}
452 		for (i=0;i<len;i++) {
453 			timeout=FDC_TIME_OUT;
454 			do {
455 				c=read_fdc_reg(FDC_MSR);
456 				if((c&0xC0)==0xC0) {
457 					bufferw[i]=read_fdc_reg(FDC_FIFO);
458 					break;
459 				}
460 				if((c&0xC0)==0x80) { /* output */
461 					PRINTF("Transfer error transferred: at %ld, MSR=%02X\n",i,c);
462 					if(i>6) {
463 						for(ii=0;ii<7;ii++) {
464 							pCMD->result[ii]=bufferw[(i-7+ii)];
465 						} /* for */
466 					}
467 					if(retriesrw++>FDC_RW_RETRIES) {
468 						if (retriescal++>FDC_CAL_RETRIES) {
469 							stop_fdc_drive(pCMD);
470 							if (flags)
471 								enable_interrupts();
472 							return false;
473 						}
474 						else {
475 							PRINTF(" trying to recalibrate Try %d\n",retriescal);
476 							if (fdc_recalibrate(pCMD, pFG) == false) {
477 								stop_fdc_drive(pCMD);
478 								if (flags)
479 									enable_interrupts();
480 								return false;
481 							}
482 							retriesrw=0;
483 							goto retrycal;
484 						} /* else >FDC_CAL_RETRIES */
485 					}
486 					else {
487 						PRINTF("Read retry %d\n",retriesrw);
488 						goto retryrw;
489 					} /* else >FDC_RW_RETRIES */
490 				}/* if output */
491 				timeout--;
492 			} while (true);
493 		} /* for len */
494 		/* the last sector of a track or all data has been read,
495 		 * we need to get the results */
496 		fdc_terminate(pCMD);
497 		offset+=(sect_size*readblk); /* set up buffer pointer */
498 		bufferw = &buffer[offset];
499 		pCMD->blnr+=readblk; /* update current block nr */
500 		blocks-=readblk; /* update blocks */
501 		if(blocks==0)
502 			break; /* we are finish */
503 		/* setup new read blocks */
504 		/*	readblk=pFG->head*pFG->sect; */
505 		readblk=pFG->sect;
506 		if(readblk>blocks)
507 			readblk=blocks;
508 retrycal:
509 		/* a seek is necessary */
510 		if (fdc_seek(pCMD, pFG) == false) {
511 			stop_fdc_drive(pCMD);
512 			if (flags)
513 				enable_interrupts();
514 			return false;
515 		}
516 		if((pCMD->result[STATUS_0]&0x20)!=0x20) {
517 			PRINTF("Seek error Status: %02X\n",pCMD->result[STATUS_0]);
518 			stop_fdc_drive(pCMD);
519 			return false;
520 		}
521 	} while (true); /* start over */
522 	stop_fdc_drive(pCMD); /* switch off drive */
523 	if (flags)
524 		enable_interrupts();
525 	return true;
526 }
527 
528 /* Scan all drives and check if drive is present and disk is inserted */
fdc_check_drive(FDC_COMMAND_STRUCT * pCMD,FD_GEO_STRUCT * pFG)529 int fdc_check_drive(FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
530 {
531 	int i,drives,state;
532   /* OK procedure of data book is satisfied.
533 	 * trying to get some information over the drives */
534 	state=0; /* no drives, no disks */
535 	for(drives=0;drives<4;drives++) {
536 		pCMD->drive=drives;
537 		select_fdc_drive(pCMD);
538 		pCMD->blnr=0; /* set to the 1st block */
539 		if (fdc_recalibrate(pCMD, pFG) == false)
540 			continue;
541 		if((pCMD->result[STATUS_0]&0x10)==0x10)
542 			continue;
543 		/* ok drive connected check for disk */
544 		state|=(1<<drives);
545 		pCMD->blnr=pFG->size; /* set to the last block */
546 		if (fdc_seek(pCMD, pFG) == false)
547 			continue;
548 		pCMD->blnr=0; /* set to the 1st block */
549 		if (fdc_recalibrate(pCMD, pFG) == false)
550 			continue;
551 		pCMD->cmd[COMMAND]=FDC_CMD_READ_ID;
552 		if (fdc_issue_cmd(pCMD, pFG) == false)
553 			continue;
554 		state|=(0x10<<drives);
555 	}
556 	stop_fdc_drive(pCMD);
557 	for(i=0;i<4;i++) {
558 		PRINTF("Floppy Drive %d %sconnected %sDisk inserted %s\n",i,
559 			((state&(1<<i))==(1<<i)) ? "":"not ",
560 			((state&(0x10<<i))==(0x10<<i)) ? "":"no ",
561 			((state&(0x10<<i))==(0x10<<i)) ? pFG->name : "");
562 	}
563 	pCMD->flags=state;
564 	return true;
565 }
566 
567 
568 /**************************************************************************
569 * int fdc_setup
570 * setup the fdc according the datasheet
571 * assuming in PS2 Mode
572 */
fdc_setup(int drive,FDC_COMMAND_STRUCT * pCMD,FD_GEO_STRUCT * pFG)573 int fdc_setup(int drive, FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
574 {
575 	int i;
576 
577 #ifdef CONFIG_SYS_FDC_HW_INIT
578 	fdc_hw_init ();
579 #endif
580 	/* first, we reset the FDC via the DOR */
581 	write_fdc_reg(FDC_DOR,0x00);
582 	for(i=0; i<255; i++) /* then we wait some time */
583 		udelay(500);
584 	/* then, we clear the reset in the DOR */
585 	pCMD->drive=drive;
586 	select_fdc_drive(pCMD);
587 	/* initialize the CCR */
588 	write_fdc_reg(FDC_CCR,pFG->rate);
589 	/* then initialize the DSR */
590 	write_fdc_reg(FDC_DSR,pFG->rate);
591 	if (wait_for_fdc_int() == false) {
592 			PRINTF("Time Out after writing CCR\n");
593 			return false;
594 	}
595 	/* now issue sense Interrupt and status command
596 	 * assuming only one drive present (drive 0) */
597 	pCMD->dma=0; /* we don't use any dma at all */
598 	for(i=0;i<4;i++) {
599 		/* issue sense interrupt for all 4 possible drives */
600 		pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
601 		if (fdc_issue_cmd(pCMD, pFG) == false) {
602 			PRINTF("Sense Interrupt for drive %d failed\n",i);
603 		}
604 	}
605 	/* issue the configure command */
606 	pCMD->drive=drive;
607 	select_fdc_drive(pCMD);
608 	pCMD->cmd[COMMAND]=FDC_CMD_CONFIGURE;
609 	if (fdc_issue_cmd(pCMD, pFG) == false) {
610 		PRINTF(" configure timeout\n");
611 		stop_fdc_drive(pCMD);
612 		return false;
613 	}
614 	/* issue specify command */
615 	pCMD->cmd[COMMAND]=FDC_CMD_SPECIFY;
616 	if (fdc_issue_cmd(pCMD, pFG) == false) {
617 		PRINTF(" specify timeout\n");
618 		stop_fdc_drive(pCMD);
619 		return false;
620 
621 	}
622 	/* then, we clear the reset in the DOR */
623 	/* fdc_check_drive(pCMD,pFG);	*/
624 	/*	write_fdc_reg(FDC_DOR,0x04); */
625 
626 	return true;
627 }
628 
629 /****************************************************************************
630  * main routine do_fdcboot
631  */
do_fdcboot(cmd_tbl_t * cmdtp,int flag,int argc,char * const argv[])632 int do_fdcboot (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
633 {
634 	FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
635 	FDC_COMMAND_STRUCT *pCMD = &cmd;
636 	unsigned long addr,imsize;
637 #if defined(CONFIG_IMAGE_FORMAT_LEGACY)
638 	image_header_t *hdr;  /* used for fdc boot */
639 #endif
640 	unsigned char boot_drive;
641 	int i,nrofblk;
642 #if defined(CONFIG_FIT)
643 	const void *fit_hdr = NULL;
644 #endif
645 
646 	switch (argc) {
647 	case 1:
648 		addr = CONFIG_SYS_LOAD_ADDR;
649 		boot_drive=CONFIG_SYS_FDC_DRIVE_NUMBER;
650 		break;
651 	case 2:
652 		addr = simple_strtoul(argv[1], NULL, 16);
653 		boot_drive=CONFIG_SYS_FDC_DRIVE_NUMBER;
654 		break;
655 	case 3:
656 		addr = simple_strtoul(argv[1], NULL, 16);
657 		boot_drive=simple_strtoul(argv[2], NULL, 10);
658 		break;
659 	default:
660 		return CMD_RET_USAGE;
661 	}
662 	/* setup FDC and scan for drives  */
663 	if (fdc_setup(boot_drive, pCMD, pFG) == false) {
664 		printf("\n** Error in setup FDC **\n");
665 		return 1;
666 	}
667 	if (fdc_check_drive(pCMD, pFG) == false) {
668 		printf("\n** Error in check_drives **\n");
669 		return 1;
670 	}
671 	if((pCMD->flags&(1<<boot_drive))==0) {
672 		/* drive not available */
673 		printf("\n** Drive %d not availabe **\n",boot_drive);
674 		return 1;
675 	}
676 	if((pCMD->flags&(0x10<<boot_drive))==0) {
677 		/* no disk inserted */
678 		printf("\n** No disk inserted in drive %d **\n",boot_drive);
679 		return 1;
680 	}
681 	/* ok, we have a valid source */
682 	pCMD->drive=boot_drive;
683 	/* read first block */
684 	pCMD->blnr=0;
685 	if (fdc_read_data((unsigned char *)addr, 1, pCMD, pFG) == false) {
686 		printf("\nRead error:");
687 		for(i=0;i<7;i++)
688 			printf("result%d: 0x%02X\n",i,pCMD->result[i]);
689 		return 1;
690 	}
691 
692 	switch (genimg_get_format ((void *)addr)) {
693 #if defined(CONFIG_IMAGE_FORMAT_LEGACY)
694 	case IMAGE_FORMAT_LEGACY:
695 		hdr = (image_header_t *)addr;
696 		image_print_contents (hdr);
697 
698 		imsize = image_get_image_size (hdr);
699 		break;
700 #endif
701 #if defined(CONFIG_FIT)
702 	case IMAGE_FORMAT_FIT:
703 		fit_hdr = (const void *)addr;
704 		puts ("Fit image detected...\n");
705 
706 		imsize = fit_get_size (fit_hdr);
707 		break;
708 #endif
709 	default:
710 		puts ("** Unknown image type\n");
711 		return 1;
712 	}
713 
714 	nrofblk=imsize/512;
715 	if((imsize%512)>0)
716 		nrofblk++;
717 	printf("Loading %ld Bytes (%d blocks) at 0x%08lx..\n",imsize,nrofblk,addr);
718 	pCMD->blnr=0;
719 	if (fdc_read_data((unsigned char *)addr, nrofblk, pCMD, pFG) == false) {
720 		/* read image block */
721 		printf("\nRead error:");
722 		for(i=0;i<7;i++)
723 			printf("result%d: 0x%02X\n",i,pCMD->result[i]);
724 		return 1;
725 	}
726 	printf("OK %ld Bytes loaded.\n",imsize);
727 
728 	flush_cache (addr, imsize);
729 
730 #if defined(CONFIG_FIT)
731 	/* This cannot be done earlier, we need complete FIT image in RAM first */
732 	if (genimg_get_format ((void *)addr) == IMAGE_FORMAT_FIT) {
733 		if (!fit_check_format (fit_hdr)) {
734 			puts ("** Bad FIT image format\n");
735 			return 1;
736 		}
737 		fit_print_contents (fit_hdr);
738 	}
739 #endif
740 
741 	/* Loading ok, update default load address */
742 	load_addr = addr;
743 
744 	return bootm_maybe_autostart(cmdtp, argv[0]);
745 }
746 
747 U_BOOT_CMD(
748 	fdcboot,	3,	1,	do_fdcboot,
749 	"boot from floppy device",
750 	"loadAddr drive"
751 );
752