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 /*#if defined(CONFIG_CMD_DATE) */
  50 /*#include <rtc.h> */
  51 /*#endif */
  52
  53 #if defined(CONFIG_CMD_FDC) || defined(CONFIG_CMD_FDOS)
  54
  55 typedef struct {
  56         int             flags;          /* connected drives ect */
  57         unsigned long   blnr;           /* Logical block nr */
  58         uchar           drive;          /* drive no */
  59         uchar           cmdlen;         /* cmd length */
  60         uchar           cmd[16];        /* cmd desc */
  61         uchar           dma;            /* if > 0 dma enabled */
  62         uchar           result[11];     /* status information */
  63         uchar           resultlen;      /* lenght of result */
  64 } FDC_COMMAND_STRUCT;
  65
  66 /* flags: only the lower 8bit used:
  67  * bit 0 if set drive 0 is present
  68  * bit 1 if set drive 1 is present
  69  * bit 2 if set drive 2 is present
  70  * bit 3 if set drive 3 is present
  71  * bit 4 if set disk in drive 0 is inserted
  72  * bit 5 if set disk in drive 1 is inserted
  73  * bit 6 if set disk in drive 2 is inserted
  74  * bit 7 if set disk in drive 4 is inserted
  75  */
  76
  77 /* cmd indexes */
  78 #define COMMAND                 0
  79 #define DRIVE                   1
  80 #define CONFIG0                 1
  81 #define SPEC_HUTSRT             1
  82 #define TRACK                   2
  83 #define CONFIG1                 2
  84 #define SPEC_HLT                2
  85 #define HEAD                    3
  86 #define CONFIG2                 3
  87 #define SECTOR                  4
  88 #define SECTOR_SIZE             5
  89 #define LAST_TRACK              6
  90 #define GAP                     7
  91 #define DTL                     8
  92 /* result indexes */
  93 #define STATUS_0                0
  94 #define STATUS_PCN              1
  95 #define STATUS_1                1
  96 #define STATUS_2                2
  97 #define STATUS_TRACK            3
  98 #define STATUS_HEAD             4
  99 #define STATUS_SECT             5
 100 #define STATUS_SECT_SIZE        6
 101
 102
 103 /* Register addresses */
 104 #define FDC_BASE        0x3F0
 105 #define FDC_SRA         FDC_BASE + 0    /* Status Register A */
 106 #define FDC_SRB         FDC_BASE + 1    /* Status Register B */
 107 #define FDC_DOR         FDC_BASE + 2    /* Digital Output Register */
 108 #define FDC_TDR         FDC_BASE + 3    /* Tape Drive Register */
 109 #define FDC_DSR         FDC_BASE + 4    /* Data rate Register */
 110 #define FDC_MSR         FDC_BASE + 4    /* Main Status Register */
 111 #define FDC_FIFO        FDC_BASE + 5    /* FIFO */
 112 #define FDC_DIR         FDC_BASE + 6    /* Digital Input Register */
 113 #define FDC_CCR         FDC_BASE + 7    /* Configuration Control */
 114 /* Commands */
 115 #define FDC_CMD_SENSE_INT       0x08
 116 #define FDC_CMD_CONFIGURE       0x13
 117 #define FDC_CMD_SPECIFY         0x03
 118 #define FDC_CMD_RECALIBRATE     0x07
 119 #define FDC_CMD_READ            0x06
 120 #define FDC_CMD_READ_TRACK      0x02
 121 #define FDC_CMD_READ_ID         0x0A
 122 #define FDC_CMD_DUMP_REG        0x0E
 123 #define FDC_CMD_SEEK            0x0F
 124
 125 #define FDC_CMD_SENSE_INT_LEN   0x01
 126 #define FDC_CMD_CONFIGURE_LEN   0x04
 127 #define FDC_CMD_SPECIFY_LEN     0x03
 128 #define FDC_CMD_RECALIBRATE_LEN 0x02
 129 #define FDC_CMD_READ_LEN        0x09
 130 #define FDC_CMD_READ_TRACK_LEN  0x09
 131 #define FDC_CMD_READ_ID_LEN     0x02
 132 #define FDC_CMD_DUMP_REG_LEN    0x01
 133 #define FDC_CMD_SEEK_LEN        0x03
 134
 135 #define FDC_FIFO_THR            0x0C
 136 #define FDC_FIFO_DIS            0x00
 137 #define FDC_IMPLIED_SEEK        0x01
 138 #define FDC_POLL_DIS            0x00
 139 #define FDC_PRE_TRK             0x00
 140 #define FDC_CONFIGURE           FDC_FIFO_THR | (FDC_POLL_DIS<<4) | (FDC_FIFO_DIS<<5) | (FDC_IMPLIED_SEEK << 6)
 141 #define FDC_MFM_MODE            0x01 /* MFM enable */
 142 #define FDC_SKIP_MODE           0x00 /* skip enable */
 143
 144 #define FDC_TIME_OUT 100000 /* time out */
 145 #define FDC_RW_RETRIES          3 /* read write retries */
 146 #define FDC_CAL_RETRIES         3 /* calibration and seek retries */
 147
 148
 149 /* Disk structure */
 150 typedef struct  {
 151         unsigned int size;      /* nr of sectors total */
 152         unsigned int sect;      /* sectors per track */
 153         unsigned int head;      /* nr of heads */
 154         unsigned int track;     /* nr of tracks */
 155         unsigned int stretch;   /* !=0 means double track steps */
 156         unsigned char   gap;    /* gap1 size */
 157         unsigned char   rate;   /* data rate. |= 0x40 for perpendicular */
 158         unsigned char   spec1;  /* stepping rate, head unload time */
 159         unsigned char   fmt_gap;/* gap2 size */
 160         unsigned char hlt;      /* head load time */
 161         unsigned char sect_code;/* Sector Size code */
 162         const char      * name; /* used only for predefined formats */
 163 } FD_GEO_STRUCT;
 164
 165
 166 /* supported Floppy types (currently only one) */
 167 const static FD_GEO_STRUCT floppy_type[2] = {
 168         { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,16,2,"H1440" },    /*  7 1.44MB 3.5"   */
 169         {    0, 0,0, 0,0,0x00,0x00,0x00,0x00, 0,0,NULL    },    /*  end of table    */
 170 };
 171
 172 static FDC_COMMAND_STRUCT cmd; /* global command struct */
 173
 174 /* If the boot drive number is undefined, we assume it's drive 0             */
 175 #ifndef CFG_FDC_DRIVE_NUMBER
 176 #define CFG_FDC_DRIVE_NUMBER 0
 177 #endif
 178
 179 /* Hardware access */
 180 #ifndef CFG_ISA_IO_STRIDE
 181 #define CFG_ISA_IO_STRIDE 1
 182 #endif
 183
 184 #ifndef CFG_ISA_IO_OFFSET
 185 #define CFG_ISA_IO_OFFSET 0
 186 #endif
 187
 188
 189 #ifdef CONFIG_AMIGAONEG3SE
 190 unsigned char INT6_Status;
 191
 192 void fdc_interrupt(void)
 193 {
 194     INT6_Status = 0x80;
 195 }
 196
 197 /* waits for an interrupt (polling) */
 198 int wait_for_fdc_int(void)
 199 {
 200         unsigned long timeout;
 201         timeout = FDC_TIME_OUT;
 202         while(((volatile)INT6_Status & 0x80) == 0) {
 203                 timeout--;
 204                 udelay(10);
 205                 if(timeout == 0) /* timeout occured */
 206                         return FALSE;
 207         }
 208         INT6_Status = 0;
 209         return TRUE;
 210 }
 211 #endif
 212
 213 /* Supporting Functions */
 214 /* reads a Register of the FDC */
 215 unsigned char read_fdc_reg(unsigned int addr)
 216 {
 217         volatile unsigned char *val =
 218                 (volatile unsigned char *)(CFG_ISA_IO_BASE_ADDRESS +
 219                                            (addr * CFG_ISA_IO_STRIDE) +
 220                                            CFG_ISA_IO_OFFSET);
 221
 222         return val [0];
 223 }
 224
 225 /* writes a Register of the FDC */
 226 void write_fdc_reg(unsigned int addr, unsigned char val)
 227 {
 228         volatile unsigned char *tmp =
 229                 (volatile unsigned char *)(CFG_ISA_IO_BASE_ADDRESS +
 230                                            (addr * CFG_ISA_IO_STRIDE) +
 231                                            CFG_ISA_IO_OFFSET);
 232         tmp[0]=val;
 233 }
 234
 235 #ifndef CONFIG_AMIGAONEG3SE
 236 /* waits for an interrupt (polling) */
 237 int wait_for_fdc_int(void)
 238 {
 239         unsigned long timeout;
 240         timeout = FDC_TIME_OUT;
 241         while((read_fdc_reg(FDC_SRA)&0x80)==0) {
 242                 timeout--;
 243                 udelay(10);
 244                 if(timeout==0) /* timeout occured */
 245                         return FALSE;
 246         }
 247         return TRUE;
 248 }
 249
 250 #endif
 251
 252 /* reads a byte from the FIFO of the FDC and checks direction and RQM bit
 253    of the MSR. returns -1 if timeout, or byte if ok */
 254 int read_fdc_byte(void)
 255 {
 256         unsigned long timeout;
 257         timeout = FDC_TIME_OUT;
 258         while((read_fdc_reg(FDC_MSR)&0xC0)!=0xC0) {
 259                 /* direction out and ready */
 260                 udelay(10);
 261                 timeout--;
 262                 if(timeout==0) /* timeout occured */
 263                         return -1;
 264         }
 265         return read_fdc_reg(FDC_FIFO);
 266 }
 267
 268 /* if the direction of the FIFO is wrong, this routine is used to
 269    empty the FIFO. Should _not_ be used */
 270 int fdc_need_more_output(void)
 271 {
 272         unsigned char c;
 273         while((read_fdc_reg(FDC_MSR)&0xC0)==0xC0)       {
 274                         c=(unsigned char)read_fdc_byte();
 275                         printf("Error: more output: %x\n",c);
 276         }
 277         return TRUE;
 278 }
 279
 280
 281 /* writes a byte to the FIFO of the FDC and checks direction and RQM bit
 282    of the MSR */
 283 int write_fdc_byte(unsigned char val)
 284 {
 285         unsigned long timeout;
 286         timeout = FDC_TIME_OUT;
 287         while((read_fdc_reg(FDC_MSR)&0xC0)!=0x80) {
 288                 /* direction in and ready for byte */
 289                 timeout--;
 290                 udelay(10);
 291                 fdc_need_more_output();
 292                 if(timeout==0) /* timeout occured */
 293                         return FALSE;
 294         }
 295         write_fdc_reg(FDC_FIFO,val);
 296         return TRUE;
 297 }
 298
 299 /* sets up all FDC commands and issues it to the FDC. If
 300    the command causes direct results (no Execution Phase)
 301    the result is be read as well. */
 302
 303 int fdc_issue_cmd(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
 304 {
 305         int i;
 306         unsigned long head,track,sect,timeout;
 307         track = pCMD->blnr / (pFG->sect * pFG->head); /* track nr */
 308         sect =  pCMD->blnr % (pFG->sect * pFG->head); /* remaining blocks */
 309         head = sect / pFG->sect; /* head nr */
 310         sect =  sect % pFG->sect; /* remaining blocks */
 311         sect++; /* sectors are 1 based */
 312         PRINTF("Cmd 0x%02x Track %ld, Head %ld, Sector %ld, Drive %d (blnr %ld)\n",
 313                 pCMD->cmd[0],track,head,sect,pCMD->drive,pCMD->blnr);
 314
 315         if(head|=0) { /* max heads = 2 */
 316                 pCMD->cmd[DRIVE]=pCMD->drive | 0x04; /* head 1 */
 317                 pCMD->cmd[HEAD]=(unsigned char) head; /* head register */
 318         }
 319         else {
 320                 pCMD->cmd[DRIVE]=pCMD->drive; /* head 0 */
 321                 pCMD->cmd[HEAD]=(unsigned char) head; /* head register */
 322         }
 323         pCMD->cmd[TRACK]=(unsigned char) track; /* track */
 324         switch (pCMD->cmd[COMMAND]) {
 325                 case FDC_CMD_READ:
 326                         pCMD->cmd[SECTOR]=(unsigned char) sect; /* sector */
 327                         pCMD->cmd[SECTOR_SIZE]=pFG->sect_code; /* sector size code */
 328                         pCMD->cmd[LAST_TRACK]=pFG->sect; /* End of track */
 329                         pCMD->cmd[GAP]=pFG->gap; /* gap */
 330                         pCMD->cmd[DTL]=0xFF; /* DTL */
 331                         pCMD->cmdlen=FDC_CMD_READ_LEN;
 332                         pCMD->cmd[COMMAND]|=(FDC_MFM_MODE<<6); /* set MFM bit */
 333                         pCMD->cmd[COMMAND]|=(FDC_SKIP_MODE<<5); /* set Skip bit */
 334                         pCMD->resultlen=0;  /* result only after execution */
 335                         break;
 336                 case FDC_CMD_SEEK:
 337                         pCMD->cmdlen=FDC_CMD_SEEK_LEN;
 338                         pCMD->resultlen=0;  /* no result */
 339                         break;
 340                 case FDC_CMD_CONFIGURE:
 341                         pCMD->cmd[CONFIG0]=0;
 342                         pCMD->cmd[CONFIG1]=FDC_CONFIGURE; /* FIFO Threshold, Poll, Enable FIFO */
 343                         pCMD->cmd[CONFIG2]=FDC_PRE_TRK; /* Precompensation Track */
 344                         pCMD->cmdlen=FDC_CMD_CONFIGURE_LEN;
 345                         pCMD->resultlen=0;  /* no result */
 346                         break;
 347                 case FDC_CMD_SPECIFY:
 348                         pCMD->cmd[SPEC_HUTSRT]=pFG->spec1;
 349                         pCMD->cmd[SPEC_HLT]=(pFG->hlt)<<1; /* head load time */
 350                         if(pCMD->dma==0)
 351                                 pCMD->cmd[SPEC_HLT]|=0x1; /* no dma */
 352                         pCMD->cmdlen=FDC_CMD_SPECIFY_LEN;
 353                         pCMD->resultlen=0;  /* no result */
 354                         break;
 355                 case FDC_CMD_DUMP_REG:
 356                         pCMD->cmdlen=FDC_CMD_DUMP_REG_LEN;
 357                         pCMD->resultlen=10;  /* 10 byte result */
 358                         break;
 359                 case FDC_CMD_READ_ID:
 360                         pCMD->cmd[COMMAND]|=(FDC_MFM_MODE<<6); /* set MFM bit */
 361                         pCMD->cmdlen=FDC_CMD_READ_ID_LEN;
 362                         pCMD->resultlen=7;  /* 7 byte result */
 363                         break;
 364                 case FDC_CMD_RECALIBRATE:
 365                         pCMD->cmd[DRIVE]&=0x03; /* don't set the head bit */
 366                         pCMD->cmdlen=FDC_CMD_RECALIBRATE_LEN;
 367                         pCMD->resultlen=0;  /* no result */
 368                         break;
 369                         break;
 370                 case FDC_CMD_SENSE_INT:
 371                         pCMD->cmdlen=FDC_CMD_SENSE_INT_LEN;
 372                         pCMD->resultlen=2;
 373                         break;
 374         }
 375         for(i=0;i<pCMD->cmdlen;i++) {
 376                 /* PRINTF("write cmd%d = 0x%02X\n",i,pCMD->cmd[i]); */
 377                 if(write_fdc_byte(pCMD->cmd[i])==FALSE) {
 378                         PRINTF("Error: timeout while issue cmd%d\n",i);
 379                         return FALSE;
 380                 }
 381         }
 382         timeout=FDC_TIME_OUT;
 383         for(i=0;i<pCMD->resultlen;i++) {
 384                 while((read_fdc_reg(FDC_MSR)&0xC0)!=0xC0) {
 385                         timeout--;
 386                         if(timeout==0) {
 387                                 PRINTF(" timeout while reading result%d MSR=0x%02X\n",i,read_fdc_reg(FDC_MSR));
 388                                 return FALSE;
 389                         }
 390                 }
 391                 pCMD->result[i]=(unsigned char)read_fdc_byte();
 392         }
 393         return TRUE;
 394 }
 395
 396 /* selects the drive assigned in the cmd structur and
 397    switches on the Motor */
 398 void select_fdc_drive(FDC_COMMAND_STRUCT *pCMD)
 399 {
 400         unsigned char val;
 401
 402         val=(1<<(4+pCMD->drive))|pCMD->drive|0xC; /* set reset, dma gate and motor bits */
 403         if((read_fdc_reg(FDC_DOR)&val)!=val) {
 404                 write_fdc_reg(FDC_DOR,val);
 405                 for(val=0;val<255;val++)
 406                         udelay(500); /* wait some time to start motor */
 407         }
 408 }
 409
 410 /* switches off the Motor of the specified drive */
 411 void stop_fdc_drive(FDC_COMMAND_STRUCT *pCMD)
 412 {
 413         unsigned char val;
 414
 415         val=(1<<(4+pCMD->drive))|pCMD->drive; /* sets motor bits */
 416         write_fdc_reg(FDC_DOR,(read_fdc_reg(FDC_DOR)&~val));
 417 }
 418
 419 /* issues a recalibrate command, waits for interrupt and
 420  * issues a sense_interrupt */
 421 int fdc_recalibrate(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
 422 {
 423         pCMD->cmd[COMMAND]=FDC_CMD_RECALIBRATE;
 424         if(fdc_issue_cmd(pCMD,pFG)==FALSE)
 425                 return FALSE;
 426         while(wait_for_fdc_int()!=TRUE);
 427         pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
 428         return(fdc_issue_cmd(pCMD,pFG));
 429 }
 430
 431 /* issues a recalibrate command, waits for interrupt and
 432  * issues a sense_interrupt */
 433 int fdc_seek(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
 434 {
 435         pCMD->cmd[COMMAND]=FDC_CMD_SEEK;
 436         if(fdc_issue_cmd(pCMD,pFG)==FALSE)
 437                 return FALSE;
 438         while(wait_for_fdc_int()!=TRUE);
 439         pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
 440         return(fdc_issue_cmd(pCMD,pFG));
 441 }
 442
 443 #ifndef CONFIG_AMIGAONEG3SE
 444 /* terminates current command, by not servicing the FIFO
 445  * waits for interrupt and fills in the result bytes */
 446 int fdc_terminate(FDC_COMMAND_STRUCT *pCMD)
 447 {
 448         int i;
 449         for(i=0;i<100;i++)
 450                 udelay(500); /* wait 500usec for fifo overrun */
 451         while((read_fdc_reg(FDC_SRA)&0x80)==0x00); /* wait as long as no int has occured */
 452         for(i=0;i<7;i++) {
 453                 pCMD->result[i]=(unsigned char)read_fdc_byte();
 454         }
 455         return TRUE;
 456 }
 457 #endif
 458 #ifdef CONFIG_AMIGAONEG3SE
 459 int fdc_terminate(FDC_COMMAND_STRUCT *pCMD)
 460 {
 461         int i;
 462         for(i=0;i<100;i++)
 463                 udelay(500); /* wait 500usec for fifo overrun */
 464         while((INT6_Status&0x80)==0x00); /* wait as long as no int has occured */
 465         for(i=0;i<7;i++) {
 466                 pCMD->result[i]=(unsigned char)read_fdc_byte();
 467         }
 468         INT6_Status = 0;
 469         return TRUE;
 470 }
 471
 472 #endif
 473
 474 #ifdef CONFIG_AMIGAONEG3SE
 475 #define disable_interrupts() 0
 476 #define enable_interrupts() (void)0
 477 #endif
 478
 479 /* reads data from FDC, seek commands are issued automatic */
 480 int fdc_read_data(unsigned char *buffer, unsigned long blocks,FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
 481 {
 482   /* first seek to start address */
 483         unsigned long len,lastblk,readblk,i,timeout,ii,offset;
 484         unsigned char pcn,c,retriesrw,retriescal;
 485         unsigned char *bufferw; /* working buffer */
 486         int sect_size;
 487         int flags;
 488
 489         flags=disable_interrupts(); /* switch off all Interrupts */
 490         select_fdc_drive(pCMD); /* switch on drive */
 491         sect_size=0x080<<pFG->sect_code;
 492         retriesrw=0;
 493         retriescal=0;
 494         offset=0;
 495         if(fdc_seek(pCMD,pFG)==FALSE) {
 496                 stop_fdc_drive(pCMD);
 497                 enable_interrupts();
 498                 return FALSE;
 499         }
 500         if((pCMD->result[STATUS_0]&0x20)!=0x20) {
 501                 printf("Seek error Status: %02X\n",pCMD->result[STATUS_0]);
 502                 stop_fdc_drive(pCMD);
 503                 enable_interrupts();
 504                 return FALSE;
 505         }
 506         pcn=pCMD->result[STATUS_PCN]; /* current track */
 507         /* now determine the next seek point */
 508         lastblk=pCMD->blnr + blocks;
 509         /*      readblk=(pFG->head*pFG->sect)-(pCMD->blnr%(pFG->head*pFG->sect)); */
 510         readblk=pFG->sect-(pCMD->blnr%pFG->sect);
 511         PRINTF("1st nr of block possible read %ld start %ld\n",readblk,pCMD->blnr);
 512         if(readblk>blocks) /* is end within 1st track */
 513                 readblk=blocks; /* yes, correct it */
 514         PRINTF("we read %ld blocks start %ld\n",readblk,pCMD->blnr);
 515         bufferw = &buffer[0]; /* setup working buffer */
 516         do {
 517 retryrw:
 518                 len=sect_size * readblk;
 519                 pCMD->cmd[COMMAND]=FDC_CMD_READ;
 520                 if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
 521                         stop_fdc_drive(pCMD);
 522                         enable_interrupts();
 523                         return FALSE;
 524                 }
 525                 for (i=0;i<len;i++) {
 526                         timeout=FDC_TIME_OUT;
 527                         do {
 528                                 c=read_fdc_reg(FDC_MSR);
 529                                 if((c&0xC0)==0xC0) {
 530                                         bufferw[i]=read_fdc_reg(FDC_FIFO);
 531                                         break;
 532                                 }
 533                                 if((c&0xC0)==0x80) { /* output */
 534                                         PRINTF("Transfer error transfered: at %ld, MSR=%02X\n",i,c);
 535                                         if(i>6) {
 536                                                 for(ii=0;ii<7;ii++) {
 537                                                         pCMD->result[ii]=bufferw[(i-7+ii)];
 538                                                 } /* for */
 539                                         }
 540                                         if(retriesrw++>FDC_RW_RETRIES) {
 541                                                 if (retriescal++>FDC_CAL_RETRIES) {
 542                                                         stop_fdc_drive(pCMD);
 543                                                         enable_interrupts();
 544                                                         return FALSE;
 545                                                 }
 546                                                 else {
 547                                                         PRINTF(" trying to recalibrate Try %d\n",retriescal);
 548                                                         if(fdc_recalibrate(pCMD,pFG)==FALSE) {
 549                                                                 stop_fdc_drive(pCMD);
 550                                                                 enable_interrupts();
 551                                                                 return FALSE;
 552                                                         }
 553                                                         retriesrw=0;
 554                                                         goto retrycal;
 555                                                 } /* else >FDC_CAL_RETRIES */
 556                                         }
 557                                         else {
 558                                                 PRINTF("Read retry %d\n",retriesrw);
 559                                                 goto retryrw;
 560                                         } /* else >FDC_RW_RETRIES */
 561                                 }/* if output */
 562                                 timeout--;
 563                         }while(TRUE);
 564                 } /* for len */
 565                 /* the last sector of a track or all data has been read,
 566                  * we need to get the results */
 567                 fdc_terminate(pCMD);
 568                 offset+=(sect_size*readblk); /* set up buffer pointer */
 569                 bufferw = &buffer[offset];
 570                 pCMD->blnr+=readblk; /* update current block nr */
 571                 blocks-=readblk; /* update blocks */
 572                 if(blocks==0)
 573                         break; /* we are finish */
 574                 /* setup new read blocks */
 575                 /*      readblk=pFG->head*pFG->sect; */
 576                 readblk=pFG->sect;
 577                 if(readblk>blocks)
 578                         readblk=blocks;
 579 retrycal:
 580                 /* a seek is necessary */
 581                 if(fdc_seek(pCMD,pFG)==FALSE) {
 582                         stop_fdc_drive(pCMD);
 583                         enable_interrupts();
 584                         return FALSE;
 585                 }
 586                 if((pCMD->result[STATUS_0]&0x20)!=0x20) {
 587                         PRINTF("Seek error Status: %02X\n",pCMD->result[STATUS_0]);
 588                         stop_fdc_drive(pCMD);
 589                         return FALSE;
 590                 }
 591                 pcn=pCMD->result[STATUS_PCN]; /* current track */
 592         }while(TRUE); /* start over */
 593         stop_fdc_drive(pCMD); /* switch off drive */
 594         enable_interrupts();
 595         return TRUE;
 596 }
 597
 598 #ifdef CONFIG_AMIGAONEG3SE
 599 #undef disable_interrupts()
 600 #undef enable_interrupts()
 601 #endif
 602
 603 /* Scan all drives and check if drive is present and disk is inserted */
 604 int fdc_check_drive(FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
 605 {
 606         int i,drives,state;
 607   /* OK procedure of data book is satisfied.
 608          * trying to get some information over the drives */
 609         state=0; /* no drives, no disks */
 610         for(drives=0;drives<4;drives++) {
 611                 pCMD->drive=drives;
 612                 select_fdc_drive(pCMD);
 613                 pCMD->blnr=0; /* set to the 1st block */
 614                 if(fdc_recalibrate(pCMD,pFG)==FALSE)
 615                         continue;
 616                 if((pCMD->result[STATUS_0]&0x10)==0x10)
 617                         continue;
 618                 /* ok drive connected check for disk */
 619                 state|=(1<<drives);
 620                 pCMD->blnr=pFG->size; /* set to the last block */
 621                 if(fdc_seek(pCMD,pFG)==FALSE)
 622                         continue;
 623                 pCMD->blnr=0; /* set to the 1st block */
 624                 if(fdc_recalibrate(pCMD,pFG)==FALSE)
 625                         continue;
 626                 pCMD->cmd[COMMAND]=FDC_CMD_READ_ID;
 627                 if(fdc_issue_cmd(pCMD,pFG)==FALSE)
 628                         continue;
 629                 state|=(0x10<<drives);
 630         }
 631         stop_fdc_drive(pCMD);
 632         for(i=0;i<4;i++) {
 633                 PRINTF("Floppy Drive %d %sconnected %sDisk inserted %s\n",i,
 634                         ((state&(1<<i))==(1<<i)) ? "":"not ",
 635                         ((state&(0x10<<i))==(0x10<<i)) ? "":"no ",
 636                         ((state&(0x10<<i))==(0x10<<i)) ? pFG->name : "");
 637         }
 638         pCMD->flags=state;
 639         return TRUE;
 640 }
 641
 642
 643 /**************************************************************************
 644 * int fdc_setup
 645 * setup the fdc according the datasheet
 646 * assuming in PS2 Mode
 647 */
 648 int fdc_setup(int drive, FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
 649 {
 650         int i;
 651
 652 #ifdef CONFIG_AMIGAONEG3SE
 653         irq_install_handler(6, (interrupt_handler_t *)fdc_interrupt, NULL);
 654         i8259_unmask_irq(6);
 655 #endif
 656
 657 #ifdef CFG_FDC_HW_INIT
 658         fdc_hw_init ();
 659 #endif
 660         /* first, we reset the FDC via the DOR */
 661         write_fdc_reg(FDC_DOR,0x00);
 662         for(i=0; i<255; i++) /* then we wait some time */
 663                 udelay(500);
 664         /* then, we clear the reset in the DOR */
 665         pCMD->drive=drive;
 666         select_fdc_drive(pCMD);
 667         /* initialize the CCR */
 668         write_fdc_reg(FDC_CCR,pFG->rate);
 669         /* then initialize the DSR */
 670         write_fdc_reg(FDC_DSR,pFG->rate);
 671         if(wait_for_fdc_int()==FALSE) {
 672                         PRINTF("Time Out after writing CCR\n");
 673                         return FALSE;
 674         }
 675         /* now issue sense Interrupt and status command
 676          * assuming only one drive present (drive 0) */
 677         pCMD->dma=0; /* we don't use any dma at all */
 678         for(i=0;i<4;i++) {
 679                 /* issue sense interrupt for all 4 possible drives */
 680                 pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
 681                 if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
 682                         PRINTF("Sense Interrupt for drive %d failed\n",i);
 683                 }
 684         }
 685         /* issue the configure command */
 686         pCMD->drive=drive;
 687         select_fdc_drive(pCMD);
 688         pCMD->cmd[COMMAND]=FDC_CMD_CONFIGURE;
 689         if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
 690                 PRINTF(" configure timeout\n");
 691                 stop_fdc_drive(pCMD);
 692                 return FALSE;
 693         }
 694         /* issue specify command */
 695         pCMD->cmd[COMMAND]=FDC_CMD_SPECIFY;
 696         if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
 697                 PRINTF(" specify timeout\n");
 698                 stop_fdc_drive(pCMD);
 699                 return FALSE;
 700
 701         }
 702         /* then, we clear the reset in the DOR */
 703         /* fdc_check_drive(pCMD,pFG);   */
 704         /*      write_fdc_reg(FDC_DOR,0x04); */
 705
 706         return TRUE;
 707 }
 708 #endif
 709
 710 #if defined(CONFIG_CMD_FDOS)
 711
 712 /* Low level functions for the Floppy-DOS layer                              */
 713
 714 /**************************************************************************
 715 * int fdc_fdos_init
 716 * initialize the FDC layer
 717 *
 718 */
 719 int fdc_fdos_init (int drive)
 720 {
 721         FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
 722         FDC_COMMAND_STRUCT *pCMD = &cmd;
 723
 724         /* setup FDC and scan for drives  */
 725         if(fdc_setup(drive,pCMD,pFG)==FALSE) {
 726                 printf("\n** Error in setup FDC **\n");
 727                 return FALSE;
 728         }
 729         if(fdc_check_drive(pCMD,pFG)==FALSE) {
 730                 printf("\n** Error in check_drives **\n");
 731                 return FALSE;
 732         }
 733         if((pCMD->flags&(1<<drive))==0) {
 734                 /* drive not available */
 735                 printf("\n** Drive %d not available **\n",drive);
 736                 return FALSE;
 737         }
 738         if((pCMD->flags&(0x10<<drive))==0) {
 739                 /* no disk inserted */
 740                 printf("\n** No disk inserted in drive %d **\n",drive);
 741                 return FALSE;
 742         }
 743         /* ok, we have a valid source */
 744         pCMD->drive=drive;
 745
 746         /* read first block */
 747         pCMD->blnr=0;
 748         return TRUE;
 749 }
 750 /**************************************************************************
 751 * int fdc_fdos_seek
 752 * parameter is a block number
 753 */
 754 int fdc_fdos_seek (int where)
 755 {
 756         FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
 757         FDC_COMMAND_STRUCT *pCMD = &cmd;
 758
 759         pCMD -> blnr = where ;
 760         return (fdc_seek (pCMD, pFG));
 761 }
 762 /**************************************************************************
 763 * int fdc_fdos_read
 764 *  the length is in block number
 765 */
 766 int fdc_fdos_read (void *buffer, int len)
 767 {
 768         FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
 769         FDC_COMMAND_STRUCT *pCMD = &cmd;
 770
 771         return (fdc_read_data (buffer, len, pCMD, pFG));
 772 }
 773 #endif
 774
 775 #if defined(CONFIG_CMD_FDC)
 776 /****************************************************************************
 777  * main routine do_fdcboot
 778  */
 779 int do_fdcboot (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 780 {
 781         FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
 782         FDC_COMMAND_STRUCT *pCMD = &cmd;
 783         unsigned long addr,imsize;
 784         image_header_t *hdr;  /* used for fdc boot */
 785         unsigned char boot_drive;
 786         int i,nrofblk;
 787         char *ep;
 788         int rcode = 0;
 789 #if defined(CONFIG_FIT)
 790         const void *fit_hdr = NULL;
 791 #endif
 792
 793         switch (argc) {
 794         case 1:
 795                 addr = CFG_LOAD_ADDR;
 796                 boot_drive=CFG_FDC_DRIVE_NUMBER;
 797                 break;
 798         case 2:
 799                 addr = simple_strtoul(argv[1], NULL, 16);
 800                 boot_drive=CFG_FDC_DRIVE_NUMBER;
 801                 break;
 802         case 3:
 803                 addr = simple_strtoul(argv[1], NULL, 16);
 804                 boot_drive=simple_strtoul(argv[2], NULL, 10);
 805                 break;
 806         default:
 807                 printf ("Usage:\n%s\n", cmdtp->usage);
 808                 return 1;
 809         }
 810         /* setup FDC and scan for drives  */
 811         if(fdc_setup(boot_drive,pCMD,pFG)==FALSE) {
 812                 printf("\n** Error in setup FDC **\n");
 813                 return 1;
 814         }
 815         if(fdc_check_drive(pCMD,pFG)==FALSE) {
 816                 printf("\n** Error in check_drives **\n");
 817                 return 1;
 818         }
 819         if((pCMD->flags&(1<<boot_drive))==0) {
 820                 /* drive not available */
 821                 printf("\n** Drive %d not availabe **\n",boot_drive);
 822                 return 1;
 823         }
 824         if((pCMD->flags&(0x10<<boot_drive))==0) {
 825                 /* no disk inserted */
 826                 printf("\n** No disk inserted in drive %d **\n",boot_drive);
 827                 return 1;
 828         }
 829         /* ok, we have a valid source */
 830         pCMD->drive=boot_drive;
 831         /* read first block */
 832         pCMD->blnr=0;
 833         if(fdc_read_data((unsigned char *)addr,1,pCMD,pFG)==FALSE) {
 834                 printf("\nRead error:");
 835                 for(i=0;i<7;i++)
 836                         printf("result%d: 0x%02X\n",i,pCMD->result[i]);
 837                 return 1;
 838         }
 839
 840         switch (genimg_get_format ((void *)addr)) {
 841         case IMAGE_FORMAT_LEGACY:
 842                 hdr = (image_header_t *)addr;
 843                 image_print_contents (hdr);
 844
 845                 imsize = image_get_image_size (hdr);
 846                 break;
 847 #if defined(CONFIG_FIT)
 848         case IMAGE_FORMAT_FIT:
 849                 fit_hdr = (const void *)addr;
 850                 puts ("Fit image detected...\n");
 851
 852                 imsize = fit_get_size (fit_hdr);
 853                 break;
 854 #endif
 855         default:
 856                 puts ("** Unknown image type\n");
 857                 return 1;
 858         }
 859
 860         nrofblk=imsize/512;
 861         if((imsize%512)>0)
 862                 nrofblk++;
 863         printf("Loading %ld Bytes (%d blocks) at 0x%08lx..\n",imsize,nrofblk,addr);
 864         pCMD->blnr=0;
 865         if(fdc_read_data((unsigned char *)addr,nrofblk,pCMD,pFG)==FALSE) {
 866                 /* read image block */
 867                 printf("\nRead error:");
 868                 for(i=0;i<7;i++)
 869                         printf("result%d: 0x%02X\n",i,pCMD->result[i]);
 870                 return 1;
 871         }
 872         printf("OK %ld Bytes loaded.\n",imsize);
 873
 874         flush_cache (addr, imsize);
 875
 876 #if defined(CONFIG_FIT)
 877         /* This cannot be done earlier, we need complete FIT image in RAM first */
 878         if (genimg_get_format ((void *)addr) == IMAGE_FORMAT_FIT) {
 879                 if (!fit_check_format (fit_hdr)) {
 880                         puts ("** Bad FIT image format\n");
 881                         return 1;
 882                 }
 883                 fit_print_contents (fit_hdr);
 884         }
 885 #endif
 886
 887         /* Loading ok, update default load address */
 888         load_addr = addr;
 889
 890         /* Check if we should attempt an auto-start */
 891         if (((ep = getenv("autostart")) != NULL) && (strcmp(ep,"yes") == 0)) {
 892                 char *local_args[2];
 893                 extern int do_bootm (cmd_tbl_t *, int, int, char *[]);
 894
 895                 local_args[0] = argv[0];
 896                 local_args[1] = NULL;
 897
 898                 printf ("Automatic boot of image at addr 0x%08lX ...\n", addr);
 899
 900                 do_bootm (cmdtp, 0, 1, local_args);
 901                 rcode ++;
 902         }
 903         return rcode;
 904 }
 905
 906
 907 #endif
 908
 909
 910 /***************************************************/
 911
 912
 913 #if defined(CONFIG_CMD_FDC)
 914
 915 U_BOOT_CMD(
 916         fdcboot,        3,      1,      do_fdcboot,
 917         "fdcboot - boot from floppy device\n",
 918         "loadAddr drive\n"
 919 );
 920 #endif