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New board directory and config for the benq delta board (copied from
[u-boot] / 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 #ifdef CONFIG_AMIGAONEG3SE
192 unsigned char INT6_Status;
193
194 void fdc_interrupt(void)
195 {
196     INT6_Status = 0x80;
197 }
198
199 /* waits for an interrupt (polling) */
200 int wait_for_fdc_int(void)
201 {
202         unsigned long timeout;
203         timeout = FDC_TIME_OUT;
204         while(((volatile)INT6_Status & 0x80) == 0) {
205                 timeout--;
206                 udelay(10);
207                 if(timeout == 0) /* timeout occured */
208                         return FALSE;
209         }
210         INT6_Status = 0;
211         return TRUE;
212 }
213 #endif
214
215 /* Supporting Functions */
216 /* reads a Register of the FDC */
217 unsigned char read_fdc_reg(unsigned int addr)
218 {
219         volatile unsigned char *val =
220                 (volatile unsigned char *)(CFG_ISA_IO_BASE_ADDRESS +
221                                            (addr * CFG_ISA_IO_STRIDE) +
222                                            CFG_ISA_IO_OFFSET);
223
224         return val [0];
225 }
226
227 /* writes a Register of the FDC */
228 void write_fdc_reg(unsigned int addr, unsigned char val)
229 {
230         volatile unsigned char *tmp =
231                 (volatile unsigned char *)(CFG_ISA_IO_BASE_ADDRESS +
232                                            (addr * CFG_ISA_IO_STRIDE) +
233                                            CFG_ISA_IO_OFFSET);
234         tmp[0]=val;
235 }
236
237 #ifndef CONFIG_AMIGAONEG3SE
238 /* waits for an interrupt (polling) */
239 int wait_for_fdc_int(void)
240 {
241         unsigned long timeout;
242         timeout = FDC_TIME_OUT;
243         while((read_fdc_reg(FDC_SRA)&0x80)==0) {
244                 timeout--;
245                 udelay(10);
246                 if(timeout==0) /* timeout occured */
247                         return FALSE;
248         }
249         return TRUE;
250 }
251
252 #endif
253
254 /* reads a byte from the FIFO of the FDC and checks direction and RQM bit
255    of the MSR. returns -1 if timeout, or byte if ok */
256 int read_fdc_byte(void)
257 {
258         unsigned long timeout;
259         timeout = FDC_TIME_OUT;
260         while((read_fdc_reg(FDC_MSR)&0xC0)!=0xC0) {
261                 /* direction out and ready */
262                 udelay(10);
263                 timeout--;
264                 if(timeout==0) /* timeout occured */
265                         return -1;
266         }
267         return read_fdc_reg(FDC_FIFO);
268 }
269
270 /* if the direction of the FIFO is wrong, this routine is used to
271    empty the FIFO. Should _not_ be used */
272 int fdc_need_more_output(void)
273 {
274         unsigned char c;
275         while((read_fdc_reg(FDC_MSR)&0xC0)==0xC0)       {
276                         c=(unsigned char)read_fdc_byte();
277                         printf("Error: more output: %x\n",c);
278         }
279         return TRUE;
280 }
281
282
283 /* writes a byte to the FIFO of the FDC and checks direction and RQM bit
284    of the MSR */
285 int write_fdc_byte(unsigned char val)
286 {
287         unsigned long timeout;
288         timeout = FDC_TIME_OUT;
289         while((read_fdc_reg(FDC_MSR)&0xC0)!=0x80) {
290                 /* direction in and ready for byte */
291                 timeout--;
292                 udelay(10);
293                 fdc_need_more_output();
294                 if(timeout==0) /* timeout occured */
295                         return FALSE;
296         }
297         write_fdc_reg(FDC_FIFO,val);
298         return TRUE;
299 }
300
301 /* sets up all FDC commands and issues it to the FDC. If
302    the command causes direct results (no Execution Phase)
303    the result is be read as well. */
304
305 int fdc_issue_cmd(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
306 {
307         int i;
308         unsigned long head,track,sect,timeout;
309         track = pCMD->blnr / (pFG->sect * pFG->head); /* track nr */
310         sect =  pCMD->blnr % (pFG->sect * pFG->head); /* remaining blocks */
311         head = sect / pFG->sect; /* head nr */
312         sect =  sect % pFG->sect; /* remaining blocks */
313         sect++; /* sectors are 1 based */
314         PRINTF("Cmd 0x%02x Track %ld, Head %ld, Sector %ld, Drive %d (blnr %ld)\n",
315                 pCMD->cmd[0],track,head,sect,pCMD->drive,pCMD->blnr);
316
317         if(head|=0) { /* max heads = 2 */
318                 pCMD->cmd[DRIVE]=pCMD->drive | 0x04; /* head 1 */
319                 pCMD->cmd[HEAD]=(unsigned char) head; /* head register */
320         }
321         else {
322                 pCMD->cmd[DRIVE]=pCMD->drive; /* head 0 */
323                 pCMD->cmd[HEAD]=(unsigned char) head; /* head register */
324         }
325         pCMD->cmd[TRACK]=(unsigned char) track; /* track */
326         switch (pCMD->cmd[COMMAND]) {
327                 case FDC_CMD_READ:
328                         pCMD->cmd[SECTOR]=(unsigned char) sect; /* sector */
329                         pCMD->cmd[SECTOR_SIZE]=pFG->sect_code; /* sector size code */
330                         pCMD->cmd[LAST_TRACK]=pFG->sect; /* End of track */
331                         pCMD->cmd[GAP]=pFG->gap; /* gap */
332                         pCMD->cmd[DTL]=0xFF; /* DTL */
333                         pCMD->cmdlen=FDC_CMD_READ_LEN;
334                         pCMD->cmd[COMMAND]|=(FDC_MFM_MODE<<6); /* set MFM bit */
335                         pCMD->cmd[COMMAND]|=(FDC_SKIP_MODE<<5); /* set Skip bit */
336                         pCMD->resultlen=0;  /* result only after execution */
337                         break;
338                 case FDC_CMD_SEEK:
339                         pCMD->cmdlen=FDC_CMD_SEEK_LEN;
340                         pCMD->resultlen=0;  /* no result */
341                         break;
342                 case FDC_CMD_CONFIGURE:
343                         pCMD->cmd[CONFIG0]=0;
344                         pCMD->cmd[CONFIG1]=FDC_CONFIGURE; /* FIFO Threshold, Poll, Enable FIFO */
345                         pCMD->cmd[CONFIG2]=FDC_PRE_TRK;         /* Precompensation Track */
346                         pCMD->cmdlen=FDC_CMD_CONFIGURE_LEN;
347                         pCMD->resultlen=0;  /* no result */
348                         break;
349                 case FDC_CMD_SPECIFY:
350                         pCMD->cmd[SPEC_HUTSRT]=pFG->spec1;
351                         pCMD->cmd[SPEC_HLT]=(pFG->hlt)<<1; /* head load time */
352                         if(pCMD->dma==0)
353                                 pCMD->cmd[SPEC_HLT]|=0x1; /* no dma */
354                         pCMD->cmdlen=FDC_CMD_SPECIFY_LEN;
355                         pCMD->resultlen=0;  /* no result */
356                         break;
357                 case FDC_CMD_DUMP_REG:
358                         pCMD->cmdlen=FDC_CMD_DUMP_REG_LEN;
359                         pCMD->resultlen=10;  /* 10 byte result */
360                         break;
361                 case FDC_CMD_READ_ID:
362                         pCMD->cmd[COMMAND]|=(FDC_MFM_MODE<<6); /* set MFM bit */
363                         pCMD->cmdlen=FDC_CMD_READ_ID_LEN;
364                         pCMD->resultlen=7;  /* 7 byte result */
365                         break;
366                 case FDC_CMD_RECALIBRATE:
367                         pCMD->cmd[DRIVE]&=0x03; /* don't set the head bit */
368                         pCMD->cmdlen=FDC_CMD_RECALIBRATE_LEN;
369                         pCMD->resultlen=0;  /* no result */
370                         break;
371                         break;
372                 case FDC_CMD_SENSE_INT:
373                         pCMD->cmdlen=FDC_CMD_SENSE_INT_LEN;
374                         pCMD->resultlen=2;
375                         break;
376         }
377         for(i=0;i<pCMD->cmdlen;i++) {
378                 /* PRINTF("write cmd%d = 0x%02X\n",i,pCMD->cmd[i]); */
379                 if(write_fdc_byte(pCMD->cmd[i])==FALSE) {
380                         PRINTF("Error: timeout while issue cmd%d\n",i);
381                         return FALSE;
382                 }
383         }
384         timeout=FDC_TIME_OUT;
385         for(i=0;i<pCMD->resultlen;i++) {
386                 while((read_fdc_reg(FDC_MSR)&0xC0)!=0xC0) {
387                         timeout--;
388                         if(timeout==0) {
389                                 PRINTF(" timeout while reading result%d MSR=0x%02X\n",i,read_fdc_reg(FDC_MSR));
390                                 return FALSE;
391                         }
392                 }
393                 pCMD->result[i]=(unsigned char)read_fdc_byte();
394         }
395         return TRUE;
396 }
397
398 /* selects the drive assigned in the cmd structur and
399    switches on the Motor */
400 void select_fdc_drive(FDC_COMMAND_STRUCT *pCMD)
401 {
402         unsigned char val;
403
404         val=(1<<(4+pCMD->drive))|pCMD->drive|0xC; /* set reset, dma gate and motor bits */
405         if((read_fdc_reg(FDC_DOR)&val)!=val) {
406                 write_fdc_reg(FDC_DOR,val);
407                 for(val=0;val<255;val++)
408                         udelay(500); /* wait some time to start motor */
409         }
410 }
411
412 /* switches off the Motor of the specified drive */
413 void stop_fdc_drive(FDC_COMMAND_STRUCT *pCMD)
414 {
415         unsigned char val;
416
417         val=(1<<(4+pCMD->drive))|pCMD->drive; /* sets motor bits */
418         write_fdc_reg(FDC_DOR,(read_fdc_reg(FDC_DOR)&~val));
419 }
420
421 /* issues a recalibrate command, waits for interrupt and
422  * issues a sense_interrupt */
423 int fdc_recalibrate(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
424 {
425         pCMD->cmd[COMMAND]=FDC_CMD_RECALIBRATE;
426         if(fdc_issue_cmd(pCMD,pFG)==FALSE)
427                 return FALSE;
428         while(wait_for_fdc_int()!=TRUE);
429         pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
430         return(fdc_issue_cmd(pCMD,pFG));
431 }
432
433 /* issues a recalibrate command, waits for interrupt and
434  * issues a sense_interrupt */
435 int fdc_seek(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
436 {
437         pCMD->cmd[COMMAND]=FDC_CMD_SEEK;
438         if(fdc_issue_cmd(pCMD,pFG)==FALSE)
439                 return FALSE;
440         while(wait_for_fdc_int()!=TRUE);
441         pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
442         return(fdc_issue_cmd(pCMD,pFG));
443 }
444
445 #ifndef CONFIG_AMIGAONEG3SE
446 /* terminates current command, by not servicing the FIFO
447  * waits for interrupt and fills in the result bytes */
448 int fdc_terminate(FDC_COMMAND_STRUCT *pCMD)
449 {
450         int i;
451         for(i=0;i<100;i++)
452                 udelay(500); /* wait 500usec for fifo overrun */
453         while((read_fdc_reg(FDC_SRA)&0x80)==0x00); /* wait as long as no int has occured */
454         for(i=0;i<7;i++) {
455                 pCMD->result[i]=(unsigned char)read_fdc_byte();
456         }
457         return TRUE;
458 }
459 #endif
460 #ifdef CONFIG_AMIGAONEG3SE
461 int fdc_terminate(FDC_COMMAND_STRUCT *pCMD)
462 {
463         int i;
464         for(i=0;i<100;i++)
465                 udelay(500); /* wait 500usec for fifo overrun */
466         while((INT6_Status&0x80)==0x00); /* wait as long as no int has occured */
467         for(i=0;i<7;i++) {
468                 pCMD->result[i]=(unsigned char)read_fdc_byte();
469         }
470         INT6_Status = 0;
471         return TRUE;
472 }
473
474 #endif
475
476 #ifdef CONFIG_AMIGAONEG3SE
477 #define disable_interrupts() 0
478 #define enable_interrupts() (void)0
479 #endif
480
481 /* reads data from FDC, seek commands are issued automatic */
482 int fdc_read_data(unsigned char *buffer, unsigned long blocks,FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
483 {
484   /* first seek to start address */
485         unsigned long len,lastblk,readblk,i,timeout,ii,offset;
486         unsigned char pcn,c,retriesrw,retriescal;
487         unsigned char *bufferw; /* working buffer */
488         int sect_size;
489         int flags;
490
491         flags=disable_interrupts(); /* switch off all Interrupts */
492         select_fdc_drive(pCMD); /* switch on drive */
493         sect_size=0x080<<pFG->sect_code;
494         retriesrw=0;
495         retriescal=0;
496         offset=0;
497         if(fdc_seek(pCMD,pFG)==FALSE) {
498                 stop_fdc_drive(pCMD);
499                 enable_interrupts();
500                 return FALSE;
501         }
502         if((pCMD->result[STATUS_0]&0x20)!=0x20) {
503                 printf("Seek error Status: %02X\n",pCMD->result[STATUS_0]);
504                 stop_fdc_drive(pCMD);
505                 enable_interrupts();
506                 return FALSE;
507         }
508         pcn=pCMD->result[STATUS_PCN]; /* current track */
509         /* now determine the next seek point */
510         lastblk=pCMD->blnr + blocks;
511         /*      readblk=(pFG->head*pFG->sect)-(pCMD->blnr%(pFG->head*pFG->sect)); */
512         readblk=pFG->sect-(pCMD->blnr%pFG->sect);
513         PRINTF("1st nr of block possible read %ld start %ld\n",readblk,pCMD->blnr);
514         if(readblk>blocks) /* is end within 1st track */
515                 readblk=blocks; /* yes, correct it */
516         PRINTF("we read %ld blocks start %ld\n",readblk,pCMD->blnr);
517         bufferw=&buffer[0]; /* setup working buffer */
518         do {
519 retryrw:
520                 len=sect_size * readblk;
521                 pCMD->cmd[COMMAND]=FDC_CMD_READ;
522                 if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
523                         stop_fdc_drive(pCMD);
524                         enable_interrupts();
525                         return FALSE;
526                 }
527                 for (i=0;i<len;i++) {
528                         timeout=FDC_TIME_OUT;
529                         do {
530                                 c=read_fdc_reg(FDC_MSR);
531                                 if((c&0xC0)==0xC0) {
532                                         bufferw[i]=read_fdc_reg(FDC_FIFO);
533                                         break;
534                                 }
535                                 if((c&0xC0)==0x80) { /* output */
536                                         PRINTF("Transfer error transfered: at %ld, MSR=%02X\n",i,c);
537                                         if(i>6) {
538                                                 for(ii=0;ii<7;ii++) {
539                                                         pCMD->result[ii]=bufferw[(i-7+ii)];
540                                                 } /* for */
541                                         }
542                                         if(retriesrw++>FDC_RW_RETRIES) {
543                                                 if (retriescal++>FDC_CAL_RETRIES) {
544                                                         stop_fdc_drive(pCMD);
545                                                         enable_interrupts();
546                                                         return FALSE;
547                                                 }
548                                                 else {
549                                                         PRINTF(" trying to recalibrate Try %d\n",retriescal);
550                                                         if(fdc_recalibrate(pCMD,pFG)==FALSE) {
551                                                                 stop_fdc_drive(pCMD);
552                                                                 enable_interrupts();
553                                                                 return FALSE;
554                                                         }
555                                                         retriesrw=0;
556                                                         goto retrycal;
557                                                 } /* else >FDC_CAL_RETRIES */
558                                         }
559                                         else {
560                                                 PRINTF("Read retry %d\n",retriesrw);
561                                                 goto retryrw;
562                                         } /* else >FDC_RW_RETRIES */
563                                 }/* if output */
564                                 timeout--;
565                         }while(TRUE);
566                 } /* for len */
567                 /* the last sector of a track or all data has been read,
568                  * we need to get the results */
569                 fdc_terminate(pCMD);
570                 offset+=(sect_size*readblk); /* set up buffer pointer */
571                 bufferw=&buffer[offset];
572                 pCMD->blnr+=readblk; /* update current block nr */
573                 blocks-=readblk; /* update blocks */
574                 if(blocks==0)
575                         break; /* we are finish */
576                 /* setup new read blocks */
577                 /*      readblk=pFG->head*pFG->sect; */
578                 readblk=pFG->sect;
579                 if(readblk>blocks)
580                         readblk=blocks;
581 retrycal:
582                 /* a seek is necessary */
583                 if(fdc_seek(pCMD,pFG)==FALSE) {
584                         stop_fdc_drive(pCMD);
585                         enable_interrupts();
586                         return FALSE;
587                 }
588                 if((pCMD->result[STATUS_0]&0x20)!=0x20) {
589                         PRINTF("Seek error Status: %02X\n",pCMD->result[STATUS_0]);
590                         stop_fdc_drive(pCMD);
591                         return FALSE;
592                 }
593                 pcn=pCMD->result[STATUS_PCN]; /* current track */
594         }while(TRUE); /* start over */
595         stop_fdc_drive(pCMD); /* switch off drive */
596         enable_interrupts();
597         return TRUE;
598 }
599
600 #ifdef CONFIG_AMIGAONEG3SE
601 #undef disable_interrupts()
602 #undef enable_interrupts()
603 #endif
604
605 /* Scan all drives and check if drive is present and disk is inserted */
606 int fdc_check_drive(FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
607 {
608         int i,drives,state;
609   /* OK procedure of data book is satisfied.
610          * trying to get some information over the drives */
611         state=0; /* no drives, no disks */
612         for(drives=0;drives<4;drives++) {
613                 pCMD->drive=drives;
614                 select_fdc_drive(pCMD);
615                 pCMD->blnr=0; /* set to the 1st block */
616                 if(fdc_recalibrate(pCMD,pFG)==FALSE)
617                         continue;
618                 if((pCMD->result[STATUS_0]&0x10)==0x10)
619                         continue;
620                 /* ok drive connected check for disk */
621                 state|=(1<<drives);
622                 pCMD->blnr=pFG->size; /* set to the last block */
623                 if(fdc_seek(pCMD,pFG)==FALSE)
624                         continue;
625                 pCMD->blnr=0; /* set to the 1st block */
626                 if(fdc_recalibrate(pCMD,pFG)==FALSE)
627                         continue;
628                 pCMD->cmd[COMMAND]=FDC_CMD_READ_ID;
629                 if(fdc_issue_cmd(pCMD,pFG)==FALSE)
630                         continue;
631                 state|=(0x10<<drives);
632         }
633         stop_fdc_drive(pCMD);
634         for(i=0;i<4;i++) {
635                 PRINTF("Floppy Drive %d %sconnected %sDisk inserted %s\n",i,
636                         ((state&(1<<i))==(1<<i)) ? "":"not ",
637                         ((state&(0x10<<i))==(0x10<<i)) ? "":"no ",
638                         ((state&(0x10<<i))==(0x10<<i)) ? pFG->name : "");
639         }
640         pCMD->flags=state;
641         return TRUE;
642 }
643
644
645 /**************************************************************************
646 * int fdc_setup
647 * setup the fdc according the datasheet
648 * assuming in PS2 Mode
649 */
650 int fdc_setup(int drive, FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
651 {
652         int i;
653
654 #ifdef CONFIG_AMIGAONEG3SE
655         irq_install_handler(6, (interrupt_handler_t *)fdc_interrupt, NULL);
656         i8259_unmask_irq(6);
657 #endif
658
659 #ifdef CFG_FDC_HW_INIT
660         fdc_hw_init ();
661 #endif
662         /* first, we reset the FDC via the DOR */
663         write_fdc_reg(FDC_DOR,0x00);
664         for(i=0; i<255; i++) /* then we wait some time */
665                 udelay(500);
666         /* then, we clear the reset in the DOR */
667         pCMD->drive=drive;
668         select_fdc_drive(pCMD);
669         /* initialize the CCR */
670         write_fdc_reg(FDC_CCR,pFG->rate);
671         /* then initialize the DSR */
672         write_fdc_reg(FDC_DSR,pFG->rate);
673         if(wait_for_fdc_int()==FALSE) {
674                         PRINTF("Time Out after writing CCR\n");
675                         return FALSE;
676         }
677         /* now issue sense Interrupt and status command
678          * assuming only one drive present (drive 0) */
679         pCMD->dma=0; /* we don't use any dma at all */
680         for(i=0;i<4;i++) {
681                 /* issue sense interrupt for all 4 possible drives */
682                 pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
683                 if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
684                         PRINTF("Sense Interrupt for drive %d failed\n",i);
685                 }
686         }
687         /* issue the configure command */
688         pCMD->drive=drive;
689         select_fdc_drive(pCMD);
690         pCMD->cmd[COMMAND]=FDC_CMD_CONFIGURE;
691         if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
692                 PRINTF(" configure timeout\n");
693                 stop_fdc_drive(pCMD);
694                 return FALSE;
695         }
696         /* issue specify command */
697         pCMD->cmd[COMMAND]=FDC_CMD_SPECIFY;
698         if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
699                 PRINTF(" specify timeout\n");
700                 stop_fdc_drive(pCMD);
701                 return FALSE;
702
703         }
704         /* then, we clear the reset in the DOR */
705         /* fdc_check_drive(pCMD,pFG);   */
706         /*      write_fdc_reg(FDC_DOR,0x04); */
707
708         return TRUE;
709 }
710 #endif /* ((CONFIG_COMMANDS & CFG_CMD_FDC)||(CONFIG_COMMANDS & CFG_CMD_FDOS))*/
711
712 #if (CONFIG_COMMANDS & CFG_CMD_FDOS)
713
714 /* Low level functions for the Floppy-DOS layer                              */
715
716 /**************************************************************************
717 * int fdc_fdos_init
718 * initialize the FDC layer
719 *
720 */
721 int fdc_fdos_init (int drive)
722 {
723         FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
724         FDC_COMMAND_STRUCT *pCMD = &cmd;
725
726         /* setup FDC and scan for drives  */
727         if(fdc_setup(drive,pCMD,pFG)==FALSE) {
728                 printf("\n** Error in setup FDC **\n");
729                 return FALSE;
730         }
731         if(fdc_check_drive(pCMD,pFG)==FALSE) {
732                 printf("\n** Error in check_drives **\n");
733                 return FALSE;
734         }
735         if((pCMD->flags&(1<<drive))==0) {
736                 /* drive not available */
737                 printf("\n** Drive %d not available **\n",drive);
738                 return FALSE;
739         }
740         if((pCMD->flags&(0x10<<drive))==0) {
741                 /* no disk inserted */
742                 printf("\n** No disk inserted in drive %d **\n",drive);
743                 return FALSE;
744         }
745         /* ok, we have a valid source */
746         pCMD->drive=drive;
747
748         /* read first block */
749         pCMD->blnr=0;
750         return TRUE;
751 }
752 /**************************************************************************
753 * int fdc_fdos_seek
754 * parameter is a block number
755 */
756 int fdc_fdos_seek (int where)
757 {
758         FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
759         FDC_COMMAND_STRUCT *pCMD = &cmd;
760
761         pCMD -> blnr = where ;
762         return (fdc_seek (pCMD, pFG));
763 }
764 /**************************************************************************
765 * int fdc_fdos_read
766 *  the length is in block number
767 */
768 int fdc_fdos_read (void *buffer, int len)
769 {
770         FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
771         FDC_COMMAND_STRUCT *pCMD = &cmd;
772
773         return (fdc_read_data (buffer, len, pCMD, pFG));
774 }
775 #endif  /* (CONFIG_COMMANDS & CFG_CMD_FDOS)                                  */
776
777 #if (CONFIG_COMMANDS & CFG_CMD_FDC)
778 /****************************************************************************
779  * main routine do_fdcboot
780  */
781 int do_fdcboot (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
782 {
783         FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
784         FDC_COMMAND_STRUCT *pCMD = &cmd;
785         unsigned long addr,imsize;
786         image_header_t *hdr;  /* used for fdc boot */
787         unsigned char boot_drive;
788         int i,nrofblk;
789         char *ep;
790         int rcode = 0;
791
792         switch (argc) {
793         case 1:
794                 addr = CFG_LOAD_ADDR;
795                 boot_drive=CFG_FDC_DRIVE_NUMBER;
796                 break;
797         case 2:
798                 addr = simple_strtoul(argv[1], NULL, 16);
799                 boot_drive=CFG_FDC_DRIVE_NUMBER;
800                 break;
801         case 3:
802                 addr = simple_strtoul(argv[1], NULL, 16);
803                 boot_drive=simple_strtoul(argv[2], NULL, 10);
804                 break;
805         default:
806                 printf ("Usage:\n%s\n", cmdtp->usage);
807                 return 1;
808         }
809         /* setup FDC and scan for drives  */
810         if(fdc_setup(boot_drive,pCMD,pFG)==FALSE) {
811                 printf("\n** Error in setup FDC **\n");
812                 return 1;
813         }
814         if(fdc_check_drive(pCMD,pFG)==FALSE) {
815                 printf("\n** Error in check_drives **\n");
816                 return 1;
817         }
818         if((pCMD->flags&(1<<boot_drive))==0) {
819                 /* drive not available */
820                 printf("\n** Drive %d not availabe **\n",boot_drive);
821                 return 1;
822         }
823         if((pCMD->flags&(0x10<<boot_drive))==0) {
824                 /* no disk inserted */
825                 printf("\n** No disk inserted in drive %d **\n",boot_drive);
826                 return 1;
827         }
828         /* ok, we have a valid source */
829         pCMD->drive=boot_drive;
830         /* read first block */
831         pCMD->blnr=0;
832         if(fdc_read_data((unsigned char *)addr,1,pCMD,pFG)==FALSE) {
833                 printf("\nRead error:");
834                 for(i=0;i<7;i++)
835                         printf("result%d: 0x%02X\n",i,pCMD->result[i]);
836                 return 1;
837         }
838         hdr = (image_header_t *)addr;
839         if (hdr->ih_magic  != IH_MAGIC) {
840                 printf ("Bad Magic Number\n");
841                 return 1;
842         }
843         print_image_hdr(hdr);
844
845         imsize= hdr->ih_size+sizeof(image_header_t);
846         nrofblk=imsize/512;
847         if((imsize%512)>0)
848                 nrofblk++;
849         printf("Loading %ld Bytes (%d blocks) at 0x%08lx..\n",imsize,nrofblk,addr);
850         pCMD->blnr=0;
851         if(fdc_read_data((unsigned char *)addr,nrofblk,pCMD,pFG)==FALSE) {
852                 /* read image block */
853                 printf("\nRead error:");
854                 for(i=0;i<7;i++)
855                         printf("result%d: 0x%02X\n",i,pCMD->result[i]);
856                 return 1;
857         }
858         printf("OK %ld Bytes loaded.\n",imsize);
859
860         flush_cache (addr, imsize);
861         /* Loading ok, update default load address */
862
863         load_addr = addr;
864         if(hdr->ih_type  == IH_TYPE_KERNEL) {
865                 /* Check if we should attempt an auto-start */
866                 if (((ep = getenv("autostart")) != NULL) && (strcmp(ep,"yes") == 0)) {
867                         char *local_args[2];
868                         extern int do_bootm (cmd_tbl_t *, int, int, char *[]);
869
870                         local_args[0] = argv[0];
871                         local_args[1] = NULL;
872
873                         printf ("Automatic boot of image at addr 0x%08lX ...\n", addr);
874
875                         do_bootm (cmdtp, 0, 1, local_args);
876                         rcode ++;
877                 }
878         }
879         return rcode;
880 }
881
882
883 #endif /* CONFIG_COMMANDS & CFG_CMD_FDC */
884
885
886 /***************************************************/
887
888
889 #if (CONFIG_COMMANDS & CFG_CMD_FDC)
890
891 U_BOOT_CMD(
892         fdcboot,        3,      1,      do_fdcboot,
893         "fdcboot - boot from floppy device\n",
894         "loadAddr drive\n"
895 );
896 #endif