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