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 /*#if defined(CONFIG_CMD_DATE) */
  43 /*#include <rtc.h> */
  44 /*#endif */
  45
  46 typedef struct {
  47         int             flags;          /* connected drives ect */
  48         unsigned long   blnr;           /* Logical block nr */
  49         uchar           drive;          /* drive no */
  50         uchar           cmdlen;         /* cmd length */
  51         uchar           cmd[16];        /* cmd desc */
  52         uchar           dma;            /* if > 0 dma enabled */
  53         uchar           result[11];     /* status information */
  54         uchar           resultlen;      /* lenght of result */
  55 } FDC_COMMAND_STRUCT;
  56
  57 /* flags: only the lower 8bit used:
  58  * bit 0 if set drive 0 is present
  59  * bit 1 if set drive 1 is present
  60  * bit 2 if set drive 2 is present
  61  * bit 3 if set drive 3 is present
  62  * bit 4 if set disk in drive 0 is inserted
  63  * bit 5 if set disk in drive 1 is inserted
  64  * bit 6 if set disk in drive 2 is inserted
  65  * bit 7 if set disk in drive 4 is inserted
  66  */
  67
  68 /* cmd indexes */
  69 #define COMMAND                 0
  70 #define DRIVE                   1
  71 #define CONFIG0                 1
  72 #define SPEC_HUTSRT             1
  73 #define TRACK                   2
  74 #define CONFIG1                 2
  75 #define SPEC_HLT                2
  76 #define HEAD                    3
  77 #define CONFIG2                 3
  78 #define SECTOR                  4
  79 #define SECTOR_SIZE             5
  80 #define LAST_TRACK              6
  81 #define GAP                     7
  82 #define DTL                     8
  83 /* result indexes */
  84 #define STATUS_0                0
  85 #define STATUS_PCN              1
  86 #define STATUS_1                1
  87 #define STATUS_2                2
  88 #define STATUS_TRACK            3
  89 #define STATUS_HEAD             4
  90 #define STATUS_SECT             5
  91 #define STATUS_SECT_SIZE        6
  92
  93
  94 /* Register addresses */
  95 #define FDC_BASE        0x3F0
  96 #define FDC_SRA         FDC_BASE + 0    /* Status Register A */
  97 #define FDC_SRB         FDC_BASE + 1    /* Status Register B */
  98 #define FDC_DOR         FDC_BASE + 2    /* Digital Output Register */
  99 #define FDC_TDR         FDC_BASE + 3    /* Tape Drive Register */
 100 #define FDC_DSR         FDC_BASE + 4    /* Data rate Register */
 101 #define FDC_MSR         FDC_BASE + 4    /* Main Status Register */
 102 #define FDC_FIFO        FDC_BASE + 5    /* FIFO */
 103 #define FDC_DIR         FDC_BASE + 6    /* Digital Input Register */
 104 #define FDC_CCR         FDC_BASE + 7    /* Configuration Control */
 105 /* Commands */
 106 #define FDC_CMD_SENSE_INT       0x08
 107 #define FDC_CMD_CONFIGURE       0x13
 108 #define FDC_CMD_SPECIFY         0x03
 109 #define FDC_CMD_RECALIBRATE     0x07
 110 #define FDC_CMD_READ            0x06
 111 #define FDC_CMD_READ_TRACK      0x02
 112 #define FDC_CMD_READ_ID         0x0A
 113 #define FDC_CMD_DUMP_REG        0x0E
 114 #define FDC_CMD_SEEK            0x0F
 115
 116 #define FDC_CMD_SENSE_INT_LEN   0x01
 117 #define FDC_CMD_CONFIGURE_LEN   0x04
 118 #define FDC_CMD_SPECIFY_LEN     0x03
 119 #define FDC_CMD_RECALIBRATE_LEN 0x02
 120 #define FDC_CMD_READ_LEN        0x09
 121 #define FDC_CMD_READ_TRACK_LEN  0x09
 122 #define FDC_CMD_READ_ID_LEN     0x02
 123 #define FDC_CMD_DUMP_REG_LEN    0x01
 124 #define FDC_CMD_SEEK_LEN        0x03
 125
 126 #define FDC_FIFO_THR            0x0C
 127 #define FDC_FIFO_DIS            0x00
 128 #define FDC_IMPLIED_SEEK        0x01
 129 #define FDC_POLL_DIS            0x00
 130 #define FDC_PRE_TRK             0x00
 131 #define FDC_CONFIGURE           FDC_FIFO_THR | (FDC_POLL_DIS<<4) | (FDC_FIFO_DIS<<5) | (FDC_IMPLIED_SEEK << 6)
 132 #define FDC_MFM_MODE            0x01 /* MFM enable */
 133 #define FDC_SKIP_MODE           0x00 /* skip enable */
 134
 135 #define FDC_TIME_OUT 100000 /* time out */
 136 #define FDC_RW_RETRIES          3 /* read write retries */
 137 #define FDC_CAL_RETRIES         3 /* calibration and seek retries */
 138
 139
 140 /* Disk structure */
 141 typedef struct  {
 142         unsigned int size;      /* nr of sectors total */
 143         unsigned int sect;      /* sectors per track */
 144         unsigned int head;      /* nr of heads */
 145         unsigned int track;     /* nr of tracks */
 146         unsigned int stretch;   /* !=0 means double track steps */
 147         unsigned char   gap;    /* gap1 size */
 148         unsigned char   rate;   /* data rate. |= 0x40 for perpendicular */
 149         unsigned char   spec1;  /* stepping rate, head unload time */
 150         unsigned char   fmt_gap;/* gap2 size */
 151         unsigned char hlt;      /* head load time */
 152         unsigned char sect_code;/* Sector Size code */
 153         const char      * name; /* used only for predefined formats */
 154 } FD_GEO_STRUCT;
 155
 156
 157 /* supported Floppy types (currently only one) */
 158 const static FD_GEO_STRUCT floppy_type[2] = {
 159         { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,16,2,"H1440" },    /*  7 1.44MB 3.5"   */
 160         {    0, 0,0, 0,0,0x00,0x00,0x00,0x00, 0,0,NULL    },    /*  end of table    */
 161 };
 162
 163 static FDC_COMMAND_STRUCT cmd; /* global command struct */
 164
 165 /* If the boot drive number is undefined, we assume it's drive 0             */
 166 #ifndef CONFIG_SYS_FDC_DRIVE_NUMBER
 167 #define CONFIG_SYS_FDC_DRIVE_NUMBER 0
 168 #endif
 169
 170 /* Hardware access */
 171 #ifndef CONFIG_SYS_ISA_IO_STRIDE
 172 #define CONFIG_SYS_ISA_IO_STRIDE 1
 173 #endif
 174
 175 #ifndef CONFIG_SYS_ISA_IO_OFFSET
 176 #define CONFIG_SYS_ISA_IO_OFFSET 0
 177 #endif
 178
 179 /* Supporting Functions */
 180 /* reads a Register of the FDC */
 181 unsigned char read_fdc_reg(unsigned int addr)
 182 {
 183         volatile unsigned char *val =
 184                 (volatile unsigned char *)(CONFIG_SYS_ISA_IO_BASE_ADDRESS +
 185                                            (addr * CONFIG_SYS_ISA_IO_STRIDE) +
 186                                            CONFIG_SYS_ISA_IO_OFFSET);
 187
 188         return val [0];
 189 }
 190
 191 /* writes a Register of the FDC */
 192 void write_fdc_reg(unsigned int addr, unsigned char val)
 193 {
 194         volatile unsigned char *tmp =
 195                 (volatile unsigned char *)(CONFIG_SYS_ISA_IO_BASE_ADDRESS +
 196                                            (addr * CONFIG_SYS_ISA_IO_STRIDE) +
 197                                            CONFIG_SYS_ISA_IO_OFFSET);
 198         tmp[0]=val;
 199 }
 200
 201 /* waits for an interrupt (polling) */
 202 int wait_for_fdc_int(void)
 203 {
 204         unsigned long timeout;
 205         timeout = FDC_TIME_OUT;
 206         while((read_fdc_reg(FDC_SRA)&0x80)==0) {
 207                 timeout--;
 208                 udelay(10);
 209                 if(timeout==0) /* timeout occured */
 210                         return false;
 211         }
 212         return true;
 213 }
 214
 215 /* reads a byte from the FIFO of the FDC and checks direction and RQM bit
 216    of the MSR. returns -1 if timeout, or byte if ok */
 217 int read_fdc_byte(void)
 218 {
 219         unsigned long timeout;
 220         timeout = FDC_TIME_OUT;
 221         while((read_fdc_reg(FDC_MSR)&0xC0)!=0xC0) {
 222                 /* direction out and ready */
 223                 udelay(10);
 224                 timeout--;
 225                 if(timeout==0) /* timeout occured */
 226                         return -1;
 227         }
 228         return read_fdc_reg(FDC_FIFO);
 229 }
 230
 231 /* if the direction of the FIFO is wrong, this routine is used to
 232    empty the FIFO. Should _not_ be used */
 233 int fdc_need_more_output(void)
 234 {
 235         unsigned char c;
 236         while((read_fdc_reg(FDC_MSR)&0xC0)==0xC0)       {
 237                         c=(unsigned char)read_fdc_byte();
 238                         printf("Error: more output: %x\n",c);
 239         }
 240         return true;
 241 }
 242
 243
 244 /* writes a byte to the FIFO of the FDC and checks direction and RQM bit
 245    of the MSR */
 246 int write_fdc_byte(unsigned char val)
 247 {
 248         unsigned long timeout;
 249         timeout = FDC_TIME_OUT;
 250         while((read_fdc_reg(FDC_MSR)&0xC0)!=0x80) {
 251                 /* direction in and ready for byte */
 252                 timeout--;
 253                 udelay(10);
 254                 fdc_need_more_output();
 255                 if(timeout==0) /* timeout occured */
 256                         return false;
 257         }
 258         write_fdc_reg(FDC_FIFO,val);
 259         return true;
 260 }
 261
 262 /* sets up all FDC commands and issues it to the FDC. If
 263    the command causes direct results (no Execution Phase)
 264    the result is be read as well. */
 265
 266 int fdc_issue_cmd(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
 267 {
 268         int i;
 269         unsigned long head,track,sect,timeout;
 270         track = pCMD->blnr / (pFG->sect * pFG->head); /* track nr */
 271         sect =  pCMD->blnr % (pFG->sect * pFG->head); /* remaining blocks */
 272         head = sect / pFG->sect; /* head nr */
 273         sect =  sect % pFG->sect; /* remaining blocks */
 274         sect++; /* sectors are 1 based */
 275         PRINTF("Cmd 0x%02x Track %ld, Head %ld, Sector %ld, Drive %d (blnr %ld)\n",
 276                 pCMD->cmd[0],track,head,sect,pCMD->drive,pCMD->blnr);
 277
 278         if(head|=0) { /* max heads = 2 */
 279                 pCMD->cmd[DRIVE]=pCMD->drive | 0x04; /* head 1 */
 280                 pCMD->cmd[HEAD]=(unsigned char) head; /* head register */
 281         }
 282         else {
 283                 pCMD->cmd[DRIVE]=pCMD->drive; /* head 0 */
 284                 pCMD->cmd[HEAD]=(unsigned char) head; /* head register */
 285         }
 286         pCMD->cmd[TRACK]=(unsigned char) track; /* track */
 287         switch (pCMD->cmd[COMMAND]) {
 288                 case FDC_CMD_READ:
 289                         pCMD->cmd[SECTOR]=(unsigned char) sect; /* sector */
 290                         pCMD->cmd[SECTOR_SIZE]=pFG->sect_code; /* sector size code */
 291                         pCMD->cmd[LAST_TRACK]=pFG->sect; /* End of track */
 292                         pCMD->cmd[GAP]=pFG->gap; /* gap */
 293                         pCMD->cmd[DTL]=0xFF; /* DTL */
 294                         pCMD->cmdlen=FDC_CMD_READ_LEN;
 295                         pCMD->cmd[COMMAND]|=(FDC_MFM_MODE<<6); /* set MFM bit */
 296                         pCMD->cmd[COMMAND]|=(FDC_SKIP_MODE<<5); /* set Skip bit */
 297                         pCMD->resultlen=0;  /* result only after execution */
 298                         break;
 299                 case FDC_CMD_SEEK:
 300                         pCMD->cmdlen=FDC_CMD_SEEK_LEN;
 301                         pCMD->resultlen=0;  /* no result */
 302                         break;
 303                 case FDC_CMD_CONFIGURE:
 304                         pCMD->cmd[CONFIG0]=0;
 305                         pCMD->cmd[CONFIG1]=FDC_CONFIGURE; /* FIFO Threshold, Poll, Enable FIFO */
 306                         pCMD->cmd[CONFIG2]=FDC_PRE_TRK; /* Precompensation Track */
 307                         pCMD->cmdlen=FDC_CMD_CONFIGURE_LEN;
 308                         pCMD->resultlen=0;  /* no result */
 309                         break;
 310                 case FDC_CMD_SPECIFY:
 311                         pCMD->cmd[SPEC_HUTSRT]=pFG->spec1;
 312                         pCMD->cmd[SPEC_HLT]=(pFG->hlt)<<1; /* head load time */
 313                         if(pCMD->dma==0)
 314                                 pCMD->cmd[SPEC_HLT]|=0x1; /* no dma */
 315                         pCMD->cmdlen=FDC_CMD_SPECIFY_LEN;
 316                         pCMD->resultlen=0;  /* no result */
 317                         break;
 318                 case FDC_CMD_DUMP_REG:
 319                         pCMD->cmdlen=FDC_CMD_DUMP_REG_LEN;
 320                         pCMD->resultlen=10;  /* 10 byte result */
 321                         break;
 322                 case FDC_CMD_READ_ID:
 323                         pCMD->cmd[COMMAND]|=(FDC_MFM_MODE<<6); /* set MFM bit */
 324                         pCMD->cmdlen=FDC_CMD_READ_ID_LEN;
 325                         pCMD->resultlen=7;  /* 7 byte result */
 326                         break;
 327                 case FDC_CMD_RECALIBRATE:
 328                         pCMD->cmd[DRIVE]&=0x03; /* don't set the head bit */
 329                         pCMD->cmdlen=FDC_CMD_RECALIBRATE_LEN;
 330                         pCMD->resultlen=0;  /* no result */
 331                         break;
 332                         break;
 333                 case FDC_CMD_SENSE_INT:
 334                         pCMD->cmdlen=FDC_CMD_SENSE_INT_LEN;
 335                         pCMD->resultlen=2;
 336                         break;
 337         }
 338         for(i=0;i<pCMD->cmdlen;i++) {
 339                 /* PRINTF("write cmd%d = 0x%02X\n",i,pCMD->cmd[i]); */
 340                 if (write_fdc_byte(pCMD->cmd[i]) == false) {
 341                         PRINTF("Error: timeout while issue cmd%d\n",i);
 342                         return false;
 343                 }
 344         }
 345         timeout=FDC_TIME_OUT;
 346         for(i=0;i<pCMD->resultlen;i++) {
 347                 while((read_fdc_reg(FDC_MSR)&0xC0)!=0xC0) {
 348                         timeout--;
 349                         if(timeout==0) {
 350                                 PRINTF(" timeout while reading result%d MSR=0x%02X\n",i,read_fdc_reg(FDC_MSR));
 351                                 return false;
 352                         }
 353                 }
 354                 pCMD->result[i]=(unsigned char)read_fdc_byte();
 355         }
 356         return true;
 357 }
 358
 359 /* selects the drive assigned in the cmd structur and
 360    switches on the Motor */
 361 void select_fdc_drive(FDC_COMMAND_STRUCT *pCMD)
 362 {
 363         unsigned char val;
 364
 365         val=(1<<(4+pCMD->drive))|pCMD->drive|0xC; /* set reset, dma gate and motor bits */
 366         if((read_fdc_reg(FDC_DOR)&val)!=val) {
 367                 write_fdc_reg(FDC_DOR,val);
 368                 for(val=0;val<255;val++)
 369                         udelay(500); /* wait some time to start motor */
 370         }
 371 }
 372
 373 /* switches off the Motor of the specified drive */
 374 void stop_fdc_drive(FDC_COMMAND_STRUCT *pCMD)
 375 {
 376         unsigned char val;
 377
 378         val=(1<<(4+pCMD->drive))|pCMD->drive; /* sets motor bits */
 379         write_fdc_reg(FDC_DOR,(read_fdc_reg(FDC_DOR)&~val));
 380 }
 381
 382 /* issues a recalibrate command, waits for interrupt and
 383  * issues a sense_interrupt */
 384 int fdc_recalibrate(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
 385 {
 386         pCMD->cmd[COMMAND]=FDC_CMD_RECALIBRATE;
 387         if (fdc_issue_cmd(pCMD, pFG) == false)
 388                 return false;
 389         while (wait_for_fdc_int() != true);
 390
 391         pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
 392         return(fdc_issue_cmd(pCMD,pFG));
 393 }
 394
 395 /* issues a recalibrate command, waits for interrupt and
 396  * issues a sense_interrupt */
 397 int fdc_seek(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
 398 {
 399         pCMD->cmd[COMMAND]=FDC_CMD_SEEK;
 400         if (fdc_issue_cmd(pCMD, pFG) == false)
 401                 return false;
 402         while (wait_for_fdc_int() != true);
 403
 404         pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
 405         return(fdc_issue_cmd(pCMD,pFG));
 406 }
 407
 408 /* terminates current command, by not servicing the FIFO
 409  * waits for interrupt and fills in the result bytes */
 410 int fdc_terminate(FDC_COMMAND_STRUCT *pCMD)
 411 {
 412         int i;
 413         for(i=0;i<100;i++)
 414                 udelay(500); /* wait 500usec for fifo overrun */
 415         while((read_fdc_reg(FDC_SRA)&0x80)==0x00); /* wait as long as no int has occured */
 416         for(i=0;i<7;i++) {
 417                 pCMD->result[i]=(unsigned char)read_fdc_byte();
 418         }
 419         return true;
 420 }
 421
 422 /* reads data from FDC, seek commands are issued automatic */
 423 int fdc_read_data(unsigned char *buffer, unsigned long blocks,FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
 424 {
 425   /* first seek to start address */
 426         unsigned long len,readblk,i,timeout,ii,offset;
 427         unsigned char c,retriesrw,retriescal;
 428         unsigned char *bufferw; /* working buffer */
 429         int sect_size;
 430         int flags;
 431
 432         flags=disable_interrupts(); /* switch off all Interrupts */
 433         select_fdc_drive(pCMD); /* switch on drive */
 434         sect_size=0x080<<pFG->sect_code;
 435         retriesrw=0;
 436         retriescal=0;
 437         offset=0;
 438         if (fdc_seek(pCMD, pFG) == false) {
 439                 stop_fdc_drive(pCMD);
 440                 if (flags)
 441                         enable_interrupts();
 442                 return false;
 443         }
 444         if((pCMD->result[STATUS_0]&0x20)!=0x20) {
 445                 printf("Seek error Status: %02X\n",pCMD->result[STATUS_0]);
 446                 stop_fdc_drive(pCMD);
 447                 if (flags)
 448                         enable_interrupts();
 449                 return false;
 450         }
 451         /* now determine the next seek point */
 452         /*      lastblk=pCMD->blnr + blocks; */
 453         /*      readblk=(pFG->head*pFG->sect)-(pCMD->blnr%(pFG->head*pFG->sect)); */
 454         readblk=pFG->sect-(pCMD->blnr%pFG->sect);
 455         PRINTF("1st nr of block possible read %ld start %ld\n",readblk,pCMD->blnr);
 456         if(readblk>blocks) /* is end within 1st track */
 457                 readblk=blocks; /* yes, correct it */
 458         PRINTF("we read %ld blocks start %ld\n",readblk,pCMD->blnr);
 459         bufferw = &buffer[0]; /* setup working buffer */
 460         do {
 461 retryrw:
 462                 len=sect_size * readblk;
 463                 pCMD->cmd[COMMAND]=FDC_CMD_READ;
 464                 if (fdc_issue_cmd(pCMD, pFG) == false) {
 465                         stop_fdc_drive(pCMD);
 466                         if (flags)
 467                                 enable_interrupts();
 468                         return false;
 469                 }
 470                 for (i=0;i<len;i++) {
 471                         timeout=FDC_TIME_OUT;
 472                         do {
 473                                 c=read_fdc_reg(FDC_MSR);
 474                                 if((c&0xC0)==0xC0) {
 475                                         bufferw[i]=read_fdc_reg(FDC_FIFO);
 476                                         break;
 477                                 }
 478                                 if((c&0xC0)==0x80) { /* output */
 479                                         PRINTF("Transfer error transfered: at %ld, MSR=%02X\n",i,c);
 480                                         if(i>6) {
 481                                                 for(ii=0;ii<7;ii++) {
 482                                                         pCMD->result[ii]=bufferw[(i-7+ii)];
 483                                                 } /* for */
 484                                         }
 485                                         if(retriesrw++>FDC_RW_RETRIES) {
 486                                                 if (retriescal++>FDC_CAL_RETRIES) {
 487                                                         stop_fdc_drive(pCMD);
 488                                                         if (flags)
 489                                                                 enable_interrupts();
 490                                                         return false;
 491                                                 }
 492                                                 else {
 493                                                         PRINTF(" trying to recalibrate Try %d\n",retriescal);
 494                                                         if (fdc_recalibrate(pCMD, pFG) == false) {
 495                                                                 stop_fdc_drive(pCMD);
 496                                                                 if (flags)
 497                                                                         enable_interrupts();
 498                                                                 return false;
 499                                                         }
 500                                                         retriesrw=0;
 501                                                         goto retrycal;
 502                                                 } /* else >FDC_CAL_RETRIES */
 503                                         }
 504                                         else {
 505                                                 PRINTF("Read retry %d\n",retriesrw);
 506                                                 goto retryrw;
 507                                         } /* else >FDC_RW_RETRIES */
 508                                 }/* if output */
 509                                 timeout--;
 510                         } while (true);
 511                 } /* for len */
 512                 /* the last sector of a track or all data has been read,
 513                  * we need to get the results */
 514                 fdc_terminate(pCMD);
 515                 offset+=(sect_size*readblk); /* set up buffer pointer */
 516                 bufferw = &buffer[offset];
 517                 pCMD->blnr+=readblk; /* update current block nr */
 518                 blocks-=readblk; /* update blocks */
 519                 if(blocks==0)
 520                         break; /* we are finish */
 521                 /* setup new read blocks */
 522                 /*      readblk=pFG->head*pFG->sect; */
 523                 readblk=pFG->sect;
 524                 if(readblk>blocks)
 525                         readblk=blocks;
 526 retrycal:
 527                 /* a seek is necessary */
 528                 if (fdc_seek(pCMD, pFG) == false) {
 529                         stop_fdc_drive(pCMD);
 530                         if (flags)
 531                                 enable_interrupts();
 532                         return false;
 533                 }
 534                 if((pCMD->result[STATUS_0]&0x20)!=0x20) {
 535                         PRINTF("Seek error Status: %02X\n",pCMD->result[STATUS_0]);
 536                         stop_fdc_drive(pCMD);
 537                         return false;
 538                 }
 539         } while (true); /* start over */
 540         stop_fdc_drive(pCMD); /* switch off drive */
 541         if (flags)
 542                 enable_interrupts();
 543         return true;
 544 }
 545
 546 /* Scan all drives and check if drive is present and disk is inserted */
 547 int fdc_check_drive(FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
 548 {
 549         int i,drives,state;
 550   /* OK procedure of data book is satisfied.
 551          * trying to get some information over the drives */
 552         state=0; /* no drives, no disks */
 553         for(drives=0;drives<4;drives++) {
 554                 pCMD->drive=drives;
 555                 select_fdc_drive(pCMD);
 556                 pCMD->blnr=0; /* set to the 1st block */
 557                 if (fdc_recalibrate(pCMD, pFG) == false)
 558                         continue;
 559                 if((pCMD->result[STATUS_0]&0x10)==0x10)
 560                         continue;
 561                 /* ok drive connected check for disk */
 562                 state|=(1<<drives);
 563                 pCMD->blnr=pFG->size; /* set to the last block */
 564                 if (fdc_seek(pCMD, pFG) == false)
 565                         continue;
 566                 pCMD->blnr=0; /* set to the 1st block */
 567                 if (fdc_recalibrate(pCMD, pFG) == false)
 568                         continue;
 569                 pCMD->cmd[COMMAND]=FDC_CMD_READ_ID;
 570                 if (fdc_issue_cmd(pCMD, pFG) == false)
 571                         continue;
 572                 state|=(0x10<<drives);
 573         }
 574         stop_fdc_drive(pCMD);
 575         for(i=0;i<4;i++) {
 576                 PRINTF("Floppy Drive %d %sconnected %sDisk inserted %s\n",i,
 577                         ((state&(1<<i))==(1<<i)) ? "":"not ",
 578                         ((state&(0x10<<i))==(0x10<<i)) ? "":"no ",
 579                         ((state&(0x10<<i))==(0x10<<i)) ? pFG->name : "");
 580         }
 581         pCMD->flags=state;
 582         return true;
 583 }
 584
 585
 586 /**************************************************************************
 587 * int fdc_setup
 588 * setup the fdc according the datasheet
 589 * assuming in PS2 Mode
 590 */
 591 int fdc_setup(int drive, FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
 592 {
 593         int i;
 594
 595 #ifdef CONFIG_SYS_FDC_HW_INIT
 596         fdc_hw_init ();
 597 #endif
 598         /* first, we reset the FDC via the DOR */
 599         write_fdc_reg(FDC_DOR,0x00);
 600         for(i=0; i<255; i++) /* then we wait some time */
 601                 udelay(500);
 602         /* then, we clear the reset in the DOR */
 603         pCMD->drive=drive;
 604         select_fdc_drive(pCMD);
 605         /* initialize the CCR */
 606         write_fdc_reg(FDC_CCR,pFG->rate);
 607         /* then initialize the DSR */
 608         write_fdc_reg(FDC_DSR,pFG->rate);
 609         if (wait_for_fdc_int() == false) {
 610                         PRINTF("Time Out after writing CCR\n");
 611                         return false;
 612         }
 613         /* now issue sense Interrupt and status command
 614          * assuming only one drive present (drive 0) */
 615         pCMD->dma=0; /* we don't use any dma at all */
 616         for(i=0;i<4;i++) {
 617                 /* issue sense interrupt for all 4 possible drives */
 618                 pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
 619                 if (fdc_issue_cmd(pCMD, pFG) == false) {
 620                         PRINTF("Sense Interrupt for drive %d failed\n",i);
 621                 }
 622         }
 623         /* issue the configure command */
 624         pCMD->drive=drive;
 625         select_fdc_drive(pCMD);
 626         pCMD->cmd[COMMAND]=FDC_CMD_CONFIGURE;
 627         if (fdc_issue_cmd(pCMD, pFG) == false) {
 628                 PRINTF(" configure timeout\n");
 629                 stop_fdc_drive(pCMD);
 630                 return false;
 631         }
 632         /* issue specify command */
 633         pCMD->cmd[COMMAND]=FDC_CMD_SPECIFY;
 634         if (fdc_issue_cmd(pCMD, pFG) == false) {
 635                 PRINTF(" specify timeout\n");
 636                 stop_fdc_drive(pCMD);
 637                 return false;
 638
 639         }
 640         /* then, we clear the reset in the DOR */
 641         /* fdc_check_drive(pCMD,pFG);   */
 642         /*      write_fdc_reg(FDC_DOR,0x04); */
 643
 644         return true;
 645 }
 646
 647 #if defined(CONFIG_CMD_FDOS)
 648
 649 /* Low level functions for the Floppy-DOS layer                              */
 650
 651 /**************************************************************************
 652 * int fdc_fdos_init
 653 * initialize the FDC layer
 654 *
 655 */
 656 int fdc_fdos_init (int drive)
 657 {
 658         FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
 659         FDC_COMMAND_STRUCT *pCMD = &cmd;
 660
 661         /* setup FDC and scan for drives  */
 662         if (fdc_setup(drive, pCMD, pFG) == false) {
 663                 printf("\n** Error in setup FDC **\n");
 664                 return false;
 665         }
 666         if (fdc_check_drive(pCMD, pFG) == false) {
 667                 printf("\n** Error in check_drives **\n");
 668                 return false;
 669         }
 670         if((pCMD->flags&(1<<drive))==0) {
 671                 /* drive not available */
 672                 printf("\n** Drive %d not available **\n",drive);
 673                 return false;
 674         }
 675         if((pCMD->flags&(0x10<<drive))==0) {
 676                 /* no disk inserted */
 677                 printf("\n** No disk inserted in drive %d **\n",drive);
 678                 return false;
 679         }
 680         /* ok, we have a valid source */
 681         pCMD->drive=drive;
 682
 683         /* read first block */
 684         pCMD->blnr=0;
 685         return true;
 686 }
 687 /**************************************************************************
 688 * int fdc_fdos_seek
 689 * parameter is a block number
 690 */
 691 int fdc_fdos_seek (int where)
 692 {
 693         FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
 694         FDC_COMMAND_STRUCT *pCMD = &cmd;
 695
 696         pCMD -> blnr = where ;
 697         return (fdc_seek (pCMD, pFG));
 698 }
 699 /**************************************************************************
 700 * int fdc_fdos_read
 701 *  the length is in block number
 702 */
 703 int fdc_fdos_read (void *buffer, int len)
 704 {
 705         FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
 706         FDC_COMMAND_STRUCT *pCMD = &cmd;
 707
 708         return (fdc_read_data (buffer, len, pCMD, pFG));
 709 }
 710 #endif
 711
 712 #if defined(CONFIG_CMD_FDC)
 713 /****************************************************************************
 714  * main routine do_fdcboot
 715  */
 716 int do_fdcboot (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 717 {
 718         FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
 719         FDC_COMMAND_STRUCT *pCMD = &cmd;
 720         unsigned long addr,imsize;
 721         image_header_t *hdr;  /* used for fdc boot */
 722         unsigned char boot_drive;
 723         int i,nrofblk;
 724 #if defined(CONFIG_FIT)
 725         const void *fit_hdr = NULL;
 726 #endif
 727
 728         switch (argc) {
 729         case 1:
 730                 addr = CONFIG_SYS_LOAD_ADDR;
 731                 boot_drive=CONFIG_SYS_FDC_DRIVE_NUMBER;
 732                 break;
 733         case 2:
 734                 addr = simple_strtoul(argv[1], NULL, 16);
 735                 boot_drive=CONFIG_SYS_FDC_DRIVE_NUMBER;
 736                 break;
 737         case 3:
 738                 addr = simple_strtoul(argv[1], NULL, 16);
 739                 boot_drive=simple_strtoul(argv[2], NULL, 10);
 740                 break;
 741         default:
 742                 return CMD_RET_USAGE;
 743         }
 744         /* setup FDC and scan for drives  */
 745         if (fdc_setup(boot_drive, pCMD, pFG) == false) {
 746                 printf("\n** Error in setup FDC **\n");
 747                 return 1;
 748         }
 749         if (fdc_check_drive(pCMD, pFG) == false) {
 750                 printf("\n** Error in check_drives **\n");
 751                 return 1;
 752         }
 753         if((pCMD->flags&(1<<boot_drive))==0) {
 754                 /* drive not available */
 755                 printf("\n** Drive %d not availabe **\n",boot_drive);
 756                 return 1;
 757         }
 758         if((pCMD->flags&(0x10<<boot_drive))==0) {
 759                 /* no disk inserted */
 760                 printf("\n** No disk inserted in drive %d **\n",boot_drive);
 761                 return 1;
 762         }
 763         /* ok, we have a valid source */
 764         pCMD->drive=boot_drive;
 765         /* read first block */
 766         pCMD->blnr=0;
 767         if (fdc_read_data((unsigned char *)addr, 1, pCMD, pFG) == false) {
 768                 printf("\nRead error:");
 769                 for(i=0;i<7;i++)
 770                         printf("result%d: 0x%02X\n",i,pCMD->result[i]);
 771                 return 1;
 772         }
 773
 774         switch (genimg_get_format ((void *)addr)) {
 775         case IMAGE_FORMAT_LEGACY:
 776                 hdr = (image_header_t *)addr;
 777                 image_print_contents (hdr);
 778
 779                 imsize = image_get_image_size (hdr);
 780                 break;
 781 #if defined(CONFIG_FIT)
 782         case IMAGE_FORMAT_FIT:
 783                 fit_hdr = (const void *)addr;
 784                 puts ("Fit image detected...\n");
 785
 786                 imsize = fit_get_size (fit_hdr);
 787                 break;
 788 #endif
 789         default:
 790                 puts ("** Unknown image type\n");
 791                 return 1;
 792         }
 793
 794         nrofblk=imsize/512;
 795         if((imsize%512)>0)
 796                 nrofblk++;
 797         printf("Loading %ld Bytes (%d blocks) at 0x%08lx..\n",imsize,nrofblk,addr);
 798         pCMD->blnr=0;
 799         if (fdc_read_data((unsigned char *)addr, nrofblk, pCMD, pFG) == false) {
 800                 /* read image block */
 801                 printf("\nRead error:");
 802                 for(i=0;i<7;i++)
 803                         printf("result%d: 0x%02X\n",i,pCMD->result[i]);
 804                 return 1;
 805         }
 806         printf("OK %ld Bytes loaded.\n",imsize);
 807
 808         flush_cache (addr, imsize);
 809
 810 #if defined(CONFIG_FIT)
 811         /* This cannot be done earlier, we need complete FIT image in RAM first */
 812         if (genimg_get_format ((void *)addr) == IMAGE_FORMAT_FIT) {
 813                 if (!fit_check_format (fit_hdr)) {
 814                         puts ("** Bad FIT image format\n");
 815                         return 1;
 816                 }
 817                 fit_print_contents (fit_hdr);
 818         }
 819 #endif
 820
 821         /* Loading ok, update default load address */
 822         load_addr = addr;
 823
 824         return bootm_maybe_autostart(cmdtp, argv[0]);
 825 }
 826
 827 U_BOOT_CMD(
 828         fdcboot,        3,      1,      do_fdcboot,
 829         "boot from floppy device",
 830         "loadAddr drive"
 831 );
 832 #endif