common/cmd_fdc.c

   1 /*
   2  * (C) Copyright 2001
   3  * Denis Peter, MPL AG, d.peter@mpl.ch.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  *
  23  */
  24 /*
  25  * Floppy Disk support
  26  */
  27
  28 #include <common.h>
  29 #include <config.h>
  30 #include <command.h>
  31 #include <image.h>
  32
  33
  34 #undef  FDC_DEBUG
  35
  36 #ifdef  FDC_DEBUG
  37 #define PRINTF(fmt,args...)     printf (fmt ,##args)
  38 #else
  39 #define PRINTF(fmt,args...)
  40 #endif
  41
  42 #ifndef TRUE
  43 #define TRUE            1
  44 #endif
  45 #ifndef FALSE
  46 #define FALSE           0
  47 #endif
  48
  49
  50 #if (CONFIG_COMMANDS & CFG_CMD_DATE)
  51 #include <rtc.h>
  52 #endif
  53
  54 #if ((CONFIG_COMMANDS & CFG_CMD_FDC) || (CONFIG_COMMANDS & CFG_CMD_FDOS))
  55
  56
  57 typedef struct {
  58         int                                             flags;          /* connected drives ect */
  59         unsigned long blnr;                     /* Logical block nr */
  60         uchar                                   drive;          /* drive no */
  61         uchar                                   cmdlen;         /* cmd length */
  62         uchar                                   cmd[16];        /* cmd desc */
  63         uchar                                   dma;                    /* if > 0 dma enabled */
  64         uchar                                   result[11];/* status information */
  65         uchar                                   resultlen; /* lenght of result */
  66 } FDC_COMMAND_STRUCT;
  67 /* flags: only the lower 8bit used:
  68  * bit 0 if set drive 0 is present
  69  * bit 1 if set drive 1 is present
  70  * bit 2 if set drive 2 is present
  71  * bit 3 if set drive 3 is present
  72  * bit 4 if set disk in drive 0 is inserted
  73  * bit 5 if set disk in drive 1 is inserted
  74  * bit 6 if set disk in drive 2 is inserted
  75  * bit 7 if set disk in drive 4 is inserted
  76  */
  77
  78
  79 /* cmd indexes */
  80 #define COMMAND                 0
  81 #define DRIVE                   1
  82 #define CONFIG0                 1
  83 #define SPEC_HUTSRT     1
  84 #define TRACK                   2
  85 #define CONFIG1                 2
  86 #define SPEC_HLT                2
  87 #define HEAD                            3
  88 #define CONFIG2                 3
  89 #define SECTOR                  4
  90 #define SECTOR_SIZE     5
  91 #define LAST_TRACK      6
  92 #define GAP                                     7
  93 #define DTL                                     8
  94 /* result indexes */
  95 #define STATUS_0                                                0
  96 #define STATUS_PCN                                      1
  97 #define STATUS_1                                                1
  98 #define STATUS_2                                                2
  99 #define STATUS_TRACK                            3
 100 #define STATUS_HEAD                                     4
 101 #define STATUS_SECT                                     5
 102 #define STATUS_SECT_SIZE                6
 103
 104
 105 /* Register addresses */
 106 #define FDC_BASE        0x3F0
 107 #define FDC_SRA         FDC_BASE + 0    /* Status Register A */
 108 #define FDC_SRB         FDC_BASE + 1    /* Status Register B */
 109 #define FDC_DOR         FDC_BASE + 2    /* Digital Output Register */
 110 #define FDC_TDR         FDC_BASE + 3    /* Tape Drive Register */
 111 #define FDC_DSR         FDC_BASE + 4    /* Data rate Register */
 112 #define FDC_MSR         FDC_BASE + 4    /* Main Status Register */
 113 #define FDC_FIFO        FDC_BASE + 5    /* FIFO */
 114 #define FDC_DIR         FDC_BASE + 6    /* Digital Input Register */
 115 #define FDC_CCR         FDC_BASE + 7    /* Configuration Control */
 116 /* Commands */
 117 #define FDC_CMD_SENSE_INT               0x08
 118 #define FDC_CMD_CONFIGURE               0x13
 119 #define FDC_CMD_SPECIFY                         0x03
 120 #define FDC_CMD_RECALIBRATE     0x07
 121 #define FDC_CMD_READ                                    0x06
 122 #define FDC_CMD_READ_TRACK              0x02
 123 #define FDC_CMD_READ_ID                         0x0A
 124 #define FDC_CMD_DUMP_REG                        0x0E
 125 #define FDC_CMD_SEEK                                    0x0F
 126
 127 #define FDC_CMD_SENSE_INT_LEN           0x01
 128 #define FDC_CMD_CONFIGURE_LEN           0x04
 129 #define FDC_CMD_SPECIFY_LEN                             0x03
 130 #define FDC_CMD_RECALIBRATE_LEN         0x02
 131 #define FDC_CMD_READ_LEN                                        0x09
 132 #define FDC_CMD_READ_TRACK_LEN          0x09
 133 #define FDC_CMD_READ_ID_LEN                             0x02
 134 #define FDC_CMD_DUMP_REG_LEN                    0x01
 135 #define FDC_CMD_SEEK_LEN                                        0x03
 136
 137 #define FDC_FIFO_THR                    0x0C
 138 #define FDC_FIFO_DIS                    0x00
 139 #define FDC_IMPLIED_SEEK        0x01
 140 #define FDC_POLL_DIS                    0x00
 141 #define FDC_PRE_TRK                             0x00
 142 #define FDC_CONFIGURE                   FDC_FIFO_THR | (FDC_POLL_DIS<<4) | (FDC_FIFO_DIS<<5) | (FDC_IMPLIED_SEEK << 6)
 143 #define FDC_MFM_MODE                    0x01 /* MFM enable */
 144 #define FDC_SKIP_MODE                   0x00 /* skip enable */
 145
 146 #define FDC_TIME_OUT 100000 /* time out */
 147 #define FDC_RW_RETRIES          3 /* read write retries */
 148 #define FDC_CAL_RETRIES         3 /* calibration and seek retries */
 149
 150
 151 /* Disk structure */
 152 typedef struct  {
 153         unsigned int size;                      /* nr of sectors total */
 154         unsigned int sect;                      /* sectors per track */
 155         unsigned int head;                      /* nr of heads */
 156         unsigned int track;                     /* nr of tracks */
 157         unsigned int stretch;           /* !=0 means double track steps */
 158         unsigned char   gap;                    /* gap1 size */
 159         unsigned char   rate;                   /* data rate. |= 0x40 for perpendicular */
 160         unsigned char   spec1;          /* stepping rate, head unload time */
 161         unsigned char   fmt_gap;        /* gap2 size */
 162         unsigned char hlt;                      /* head load time */
 163         unsigned char sect_code; /* Sector Size code */
 164         const char      * name;                 /* used only for predefined formats */
 165 } FD_GEO_STRUCT;
 166
 167
 168 /* supported Floppy types (currently only one) */
 169 const static FD_GEO_STRUCT floppy_type[2] = {
 170         { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,16,2,"H1440" },    /*  7 1.44MB 3.5"   */
 171         {    0, 0,0, 0,0,0x00,0x00,0x00,0x00, 0,0,NULL    },    /*  end of table    */
 172 };
 173
 174 static FDC_COMMAND_STRUCT cmd; /* global command struct */
 175
 176 /* If the boot drive number is undefined, we assume it's drive 0             */
 177 #ifndef CFG_FDC_DRIVE_NUMBER
 178 #define CFG_FDC_DRIVE_NUMBER 0
 179 #endif
 180
 181 /* Hardware access */
 182 #ifndef CFG_ISA_IO_STRIDE
 183 #define CFG_ISA_IO_STRIDE 1
 184 #endif
 185
 186 #ifndef CFG_ISA_IO_OFFSET
 187 #define CFG_ISA_IO_OFFSET 0
 188 #endif
 189
 190
 191 /* Supporting Functions */
 192 /* reads a Register of the FDC */
 193 unsigned char read_fdc_reg(unsigned int addr)
 194 {
 195         volatile unsigned char *val =
 196                 (volatile unsigned char *)(CFG_ISA_IO_BASE_ADDRESS +
 197                                            (addr * CFG_ISA_IO_STRIDE) +
 198                                            CFG_ISA_IO_OFFSET);
 199
 200         return val [0];
 201 }
 202
 203 /* writes a Register of the FDC */
 204 void write_fdc_reg(unsigned int addr, unsigned char val)
 205 {
 206         volatile unsigned char *tmp =
 207                 (volatile unsigned char *)(CFG_ISA_IO_BASE_ADDRESS +
 208                                            (addr * CFG_ISA_IO_STRIDE) +
 209                                            CFG_ISA_IO_OFFSET);
 210         tmp[0]=val;
 211 }
 212
 213 /* waits for an interrupt (polling) */
 214 int wait_for_fdc_int(void)
 215 {
 216         unsigned long timeout;
 217         timeout = FDC_TIME_OUT;
 218         while((read_fdc_reg(FDC_SRA)&0x80)==0) {
 219                 timeout--;
 220                 udelay(10);
 221                 if(timeout==0) /* timeout occured */
 222                         return FALSE;
 223         }
 224         return TRUE;
 225 }
 226
 227
 228 /* reads a byte from the FIFO of the FDC and checks direction and RQM bit
 229    of the MSR. returns -1 if timeout, or byte if ok */
 230 int read_fdc_byte(void)
 231 {
 232         unsigned long timeout;
 233         timeout = FDC_TIME_OUT;
 234         while((read_fdc_reg(FDC_MSR)&0xC0)!=0xC0) {
 235                 /* direction out and ready */
 236                 udelay(10);
 237                 timeout--;
 238                 if(timeout==0) /* timeout occured */
 239                         return -1;
 240         }
 241         return read_fdc_reg(FDC_FIFO);
 242 }
 243
 244 /* if the direction of the FIFO is wrong, this routine is used to
 245    empty the FIFO. Should _not_ be used */
 246 int fdc_need_more_output(void)
 247 {
 248         unsigned char c;
 249         while((read_fdc_reg(FDC_MSR)&0xC0)==0xC0)       {
 250                         c=(unsigned char)read_fdc_byte();
 251                         printf("Error: more output: %x\n",c);
 252         }
 253         return TRUE;
 254 }
 255
 256
 257 /* writes a byte to the FIFO of the FDC and checks direction and RQM bit
 258    of the MSR */
 259 int write_fdc_byte(unsigned char val)
 260 {
 261         unsigned long timeout;
 262         timeout = FDC_TIME_OUT;
 263         while((read_fdc_reg(FDC_MSR)&0xC0)!=0x80) {
 264                 /* direction in and ready for byte */
 265                 timeout--;
 266                 udelay(10);
 267                 fdc_need_more_output();
 268                 if(timeout==0) /* timeout occured */
 269                         return FALSE;
 270         }
 271         write_fdc_reg(FDC_FIFO,val);
 272         return TRUE;
 273 }
 274
 275 /* sets up all FDC commands and issues it to the FDC. If
 276    the command causes direct results (no Execution Phase)
 277    the result is be read as well. */
 278
 279 int fdc_issue_cmd(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
 280 {
 281         int i;
 282         unsigned long head,track,sect,timeout;
 283         track = pCMD->blnr / (pFG->sect * pFG->head); /* track nr */
 284         sect =  pCMD->blnr % (pFG->sect * pFG->head); /* remaining blocks */
 285         head = sect / pFG->sect; /* head nr */
 286         sect =  sect % pFG->sect; /* remaining blocks */
 287         sect++; /* sectors are 1 based */
 288         PRINTF("Cmd 0x%02x Track %ld, Head %ld, Sector %ld, Drive %d (blnr %ld)\n",
 289                 pCMD->cmd[0],track,head,sect,pCMD->drive,pCMD->blnr);
 290
 291         if(head|=0) { /* max heads = 2 */
 292                 pCMD->cmd[DRIVE]=pCMD->drive | 0x04; /* head 1 */
 293                 pCMD->cmd[HEAD]=(unsigned char) head; /* head register */
 294         }
 295         else {
 296                 pCMD->cmd[DRIVE]=pCMD->drive; /* head 0 */
 297                 pCMD->cmd[HEAD]=(unsigned char) head; /* head register */
 298         }
 299         pCMD->cmd[TRACK]=(unsigned char) track; /* track */
 300         switch (pCMD->cmd[COMMAND]) {
 301                 case FDC_CMD_READ:
 302                         pCMD->cmd[SECTOR]=(unsigned char) sect; /* sector */
 303                         pCMD->cmd[SECTOR_SIZE]=pFG->sect_code; /* sector size code */
 304                         pCMD->cmd[LAST_TRACK]=pFG->sect; /* End of track */
 305                         pCMD->cmd[GAP]=pFG->gap; /* gap */
 306                         pCMD->cmd[DTL]=0xFF; /* DTL */
 307                         pCMD->cmdlen=FDC_CMD_READ_LEN;
 308                         pCMD->cmd[COMMAND]|=(FDC_MFM_MODE<<6); /* set MFM bit */
 309                         pCMD->cmd[COMMAND]|=(FDC_SKIP_MODE<<5); /* set Skip bit */
 310                         pCMD->resultlen=0;  /* result only after execution */
 311                         break;
 312                 case FDC_CMD_SEEK:
 313                         pCMD->cmdlen=FDC_CMD_SEEK_LEN;
 314                         pCMD->resultlen=0;  /* no result */
 315                         break;
 316                 case FDC_CMD_CONFIGURE:
 317                         pCMD->cmd[CONFIG0]=0;
 318                         pCMD->cmd[CONFIG1]=FDC_CONFIGURE; /* FIFO Threshold, Poll, Enable FIFO */
 319                         pCMD->cmd[CONFIG2]=FDC_PRE_TRK;         /* Precompensation Track */
 320                         pCMD->cmdlen=FDC_CMD_CONFIGURE_LEN;
 321                         pCMD->resultlen=0;  /* no result */
 322                         break;
 323                 case FDC_CMD_SPECIFY:
 324                         pCMD->cmd[SPEC_HUTSRT]=pFG->spec1;
 325                         pCMD->cmd[SPEC_HLT]=(pFG->hlt)<<1; /* head load time */
 326                         if(pCMD->dma==0)
 327                                 pCMD->cmd[SPEC_HLT]|=0x1; /* no dma */
 328                         pCMD->cmdlen=FDC_CMD_SPECIFY_LEN;
 329                         pCMD->resultlen=0;  /* no result */
 330                         break;
 331                 case FDC_CMD_DUMP_REG:
 332                         pCMD->cmdlen=FDC_CMD_DUMP_REG_LEN;
 333                         pCMD->resultlen=10;  /* 10 byte result */
 334                         break;
 335                 case FDC_CMD_READ_ID:
 336                         pCMD->cmd[COMMAND]|=(FDC_MFM_MODE<<6); /* set MFM bit */
 337                         pCMD->cmdlen=FDC_CMD_READ_ID_LEN;
 338                         pCMD->resultlen=7;  /* 7 byte result */
 339                         break;
 340                 case FDC_CMD_RECALIBRATE:
 341                         pCMD->cmd[DRIVE]&=0x03; /* don't set the head bit */
 342                         pCMD->cmdlen=FDC_CMD_RECALIBRATE_LEN;
 343                         pCMD->resultlen=0;  /* no result */
 344                         break;
 345                         break;
 346                 case FDC_CMD_SENSE_INT:
 347                         pCMD->cmdlen=FDC_CMD_SENSE_INT_LEN;
 348                         pCMD->resultlen=2;
 349                         break;
 350         }
 351         for(i=0;i<pCMD->cmdlen;i++) {
 352                 /* PRINTF("write cmd%d = 0x%02X\n",i,pCMD->cmd[i]); */
 353                 if(write_fdc_byte(pCMD->cmd[i])==FALSE) {
 354                         PRINTF("Error: timeout while issue cmd%d\n",i);
 355                         return FALSE;
 356                 }
 357         }
 358         timeout=FDC_TIME_OUT;
 359         for(i=0;i<pCMD->resultlen;i++) {
 360                 while((read_fdc_reg(FDC_MSR)&0xC0)!=0xC0) {
 361                         timeout--;
 362                         if(timeout==0) {
 363                                 PRINTF(" timeout while reading result%d MSR=0x%02X\n",i,read_fdc_reg(FDC_MSR));
 364                                 return FALSE;
 365                         }
 366                 }
 367                 pCMD->result[i]=(unsigned char)read_fdc_byte();
 368         }
 369         return TRUE;
 370 }
 371
 372 /* selects the drive assigned in the cmd structur and
 373    switches on the Motor */
 374 void select_fdc_drive(FDC_COMMAND_STRUCT *pCMD)
 375 {
 376         unsigned char val;
 377
 378         val=(1<<(4+pCMD->drive))|pCMD->drive|0xC; /* set reset, dma gate and motor bits */
 379         if((read_fdc_reg(FDC_DOR)&val)!=val) {
 380                 write_fdc_reg(FDC_DOR,val);
 381                 for(val=0;val<255;val++)
 382                         udelay(500); /* wait some time to start motor */
 383         }
 384 }
 385
 386 /* switches off the Motor of the specified drive */
 387 void stop_fdc_drive(FDC_COMMAND_STRUCT *pCMD)
 388 {
 389         unsigned char val;
 390
 391         val=(1<<(4+pCMD->drive))|pCMD->drive; /* sets motor bits */
 392         write_fdc_reg(FDC_DOR,(read_fdc_reg(FDC_DOR)&~val));
 393 }
 394
 395 /* issues a recalibrate command, waits for interrupt and
 396  * issues a sense_interrupt */
 397 int fdc_recalibrate(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
 398 {
 399         pCMD->cmd[COMMAND]=FDC_CMD_RECALIBRATE;
 400         if(fdc_issue_cmd(pCMD,pFG)==FALSE)
 401                 return FALSE;
 402         while(wait_for_fdc_int()!=TRUE);
 403         pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
 404         return(fdc_issue_cmd(pCMD,pFG));
 405 }
 406
 407 /* issues a recalibrate command, waits for interrupt and
 408  * issues a sense_interrupt */
 409 int fdc_seek(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
 410 {
 411         pCMD->cmd[COMMAND]=FDC_CMD_SEEK;
 412         if(fdc_issue_cmd(pCMD,pFG)==FALSE)
 413                 return FALSE;
 414         while(wait_for_fdc_int()!=TRUE);
 415         pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
 416         return(fdc_issue_cmd(pCMD,pFG));
 417 }
 418
 419
 420 /* terminates current command, by not servicing the FIFO
 421  * waits for interrupt and fills in the result bytes */
 422 int fdc_terminate(FDC_COMMAND_STRUCT *pCMD)
 423 {
 424         int i;
 425         for(i=0;i<100;i++)
 426                 udelay(500); /* wait 500usec for fifo overrun */
 427         while((read_fdc_reg(FDC_SRA)&0x80)==0x00); /* wait as long as no int has occured */
 428         for(i=0;i<7;i++) {
 429                 pCMD->result[i]=(unsigned char)read_fdc_byte();
 430         }
 431         return TRUE;
 432 }
 433
 434 /* reads data from FDC, seek commands are issued automatic */
 435 int fdc_read_data(unsigned char *buffer, unsigned long blocks,FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
 436 {
 437   /* first seek to start address */
 438         unsigned long len,lastblk,readblk,i,timeout,ii,offset;
 439         unsigned char pcn,c,retriesrw,retriescal;
 440         unsigned char *bufferw; /* working buffer */
 441         int sect_size;
 442         int flags;
 443
 444         flags=disable_interrupts(); /* switch off all Interrupts */
 445         select_fdc_drive(pCMD); /* switch on drive */
 446         sect_size=0x080<<pFG->sect_code;
 447         retriesrw=0;
 448         retriescal=0;
 449         offset=0;
 450         if(fdc_seek(pCMD,pFG)==FALSE) {
 451                 stop_fdc_drive(pCMD);
 452                 enable_interrupts();
 453                 return FALSE;
 454         }
 455         if((pCMD->result[STATUS_0]&0x20)!=0x20) {
 456                 printf("Seek error Status: %02X\n",pCMD->result[STATUS_0]);
 457                 stop_fdc_drive(pCMD);
 458                 enable_interrupts();
 459                 return FALSE;
 460         }
 461         pcn=pCMD->result[STATUS_PCN]; /* current track */
 462         /* now determine the next seek point */
 463         lastblk=pCMD->blnr + blocks;
 464         /*      readblk=(pFG->head*pFG->sect)-(pCMD->blnr%(pFG->head*pFG->sect)); */
 465         readblk=pFG->sect-(pCMD->blnr%pFG->sect);
 466         PRINTF("1st nr of block possible read %ld start %ld\n",readblk,pCMD->blnr);
 467         if(readblk>blocks) /* is end within 1st track */
 468                 readblk=blocks; /* yes, correct it */
 469         PRINTF("we read %ld blocks start %ld\n",readblk,pCMD->blnr);
 470         bufferw=&buffer[0]; /* setup working buffer */
 471         do {
 472 retryrw:
 473                 len=sect_size * readblk;
 474                 pCMD->cmd[COMMAND]=FDC_CMD_READ;
 475                 if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
 476                         stop_fdc_drive(pCMD);
 477                         enable_interrupts();
 478                         return FALSE;
 479                 }
 480                 for (i=0;i<len;i++) {
 481                         timeout=FDC_TIME_OUT;
 482                         do {
 483                                 c=read_fdc_reg(FDC_MSR);
 484                                 if((c&0xC0)==0xC0) {
 485                                         bufferw[i]=read_fdc_reg(FDC_FIFO);
 486                                         break;
 487                                 }
 488                                 if((c&0xC0)==0x80) { /* output */
 489                                         PRINTF("Transfer error transfered: at %ld, MSR=%02X\n",i,c);
 490                                         if(i>6) {
 491                                                 for(ii=0;ii<7;ii++) {
 492                                                         pCMD->result[ii]=bufferw[(i-7+ii)];
 493                                                 } /* for */
 494                                         }
 495                                         if(retriesrw++>FDC_RW_RETRIES) {
 496                                                 if (retriescal++>FDC_CAL_RETRIES) {
 497                                                         stop_fdc_drive(pCMD);
 498                                                         enable_interrupts();
 499                                                         return FALSE;
 500                                                 }
 501                                                 else {
 502                                                         PRINTF(" trying to recalibrate Try %d\n",retriescal);
 503                                                         if(fdc_recalibrate(pCMD,pFG)==FALSE) {
 504                                                                 stop_fdc_drive(pCMD);
 505                                                                 enable_interrupts();
 506                                                                 return FALSE;
 507                                                         }
 508                                                         retriesrw=0;
 509                                                         goto retrycal;
 510                                                 } /* else >FDC_CAL_RETRIES */
 511                                         }
 512                                         else {
 513                                                 PRINTF("Read retry %d\n",retriesrw);
 514                                                 goto retryrw;
 515                                         } /* else >FDC_RW_RETRIES */
 516                                 }/* if output */
 517                                 timeout--;
 518                         }while(TRUE);
 519                 } /* for len */
 520                 /* the last sector of a track or all data has been read,
 521                  * we need to get the results */
 522                 fdc_terminate(pCMD);
 523                 offset+=(sect_size*readblk); /* set up buffer pointer */
 524                 bufferw=&buffer[offset];
 525                 pCMD->blnr+=readblk; /* update current block nr */
 526                 blocks-=readblk; /* update blocks */
 527                 if(blocks==0)
 528                         break; /* we are finish */
 529                 /* setup new read blocks */
 530                 /*      readblk=pFG->head*pFG->sect; */
 531                 readblk=pFG->sect;
 532                 if(readblk>blocks)
 533                         readblk=blocks;
 534 retrycal:
 535                 /* a seek is necessary */
 536                 if(fdc_seek(pCMD,pFG)==FALSE) {
 537                         stop_fdc_drive(pCMD);
 538                         enable_interrupts();
 539                         return FALSE;
 540                 }
 541                 if((pCMD->result[STATUS_0]&0x20)!=0x20) {
 542                         PRINTF("Seek error Status: %02X\n",pCMD->result[STATUS_0]);
 543                         stop_fdc_drive(pCMD);
 544                         return FALSE;
 545                 }
 546                 pcn=pCMD->result[STATUS_PCN]; /* current track */
 547         }while(TRUE); /* start over */
 548         stop_fdc_drive(pCMD); /* switch off drive */
 549         enable_interrupts();
 550         return TRUE;
 551 }
 552
 553 /* Scan all drives and check if drive is present and disk is inserted */
 554 int fdc_check_drive(FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
 555 {
 556         int i,drives,state;
 557   /* OK procedure of data book is satisfied.
 558          * trying to get some information over the drives */
 559         state=0; /* no drives, no disks */
 560         for(drives=0;drives<4;drives++) {
 561                 pCMD->drive=drives;
 562                 select_fdc_drive(pCMD);
 563                 pCMD->blnr=0; /* set to the 1st block */
 564                 if(fdc_recalibrate(pCMD,pFG)==FALSE)
 565                         continue;
 566                 if((pCMD->result[STATUS_0]&0x10)==0x10)
 567                         continue;
 568                 /* ok drive connected check for disk */
 569                 state|=(1<<drives);
 570                 pCMD->blnr=pFG->size; /* set to the last block */
 571                 if(fdc_seek(pCMD,pFG)==FALSE)
 572                         continue;
 573                 pCMD->blnr=0; /* set to the 1st block */
 574                 if(fdc_recalibrate(pCMD,pFG)==FALSE)
 575                         continue;
 576                 pCMD->cmd[COMMAND]=FDC_CMD_READ_ID;
 577                 if(fdc_issue_cmd(pCMD,pFG)==FALSE)
 578                         continue;
 579                 state|=(0x10<<drives);
 580         }
 581         stop_fdc_drive(pCMD);
 582         for(i=0;i<4;i++) {
 583                 PRINTF("Floppy Drive %d %sconnected %sDisk inserted %s\n",i,
 584                         ((state&(1<<i))==(1<<i)) ? "":"not ",
 585                         ((state&(0x10<<i))==(0x10<<i)) ? "":"no ",
 586                         ((state&(0x10<<i))==(0x10<<i)) ? pFG->name : "");
 587         }
 588         pCMD->flags=state;
 589         return TRUE;
 590 }
 591
 592
 593 /**************************************************************************
 594 * int fdc_setup
 595 * setup the fdc according the datasheet
 596 * assuming in PS2 Mode
 597 */
 598 int fdc_setup(int drive, FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
 599 {
 600
 601         int i;
 602
 603 #ifdef CFG_FDC_HW_INIT
 604         fdc_hw_init ();
 605 #endif
 606         /* first, we reset the FDC via the DOR */
 607         write_fdc_reg(FDC_DOR,0x00);
 608         for(i=0; i<255; i++) /* then we wait some time */
 609                 udelay(500);
 610         /* then, we clear the reset in the DOR */
 611         pCMD->drive=drive;
 612         select_fdc_drive(pCMD);
 613         /* initialize the CCR */
 614         write_fdc_reg(FDC_CCR,pFG->rate);
 615         /* then initialize the DSR */
 616         write_fdc_reg(FDC_DSR,pFG->rate);
 617         if(wait_for_fdc_int()==FALSE) {
 618                         PRINTF("Time Out after writing CCR\n");
 619                         return FALSE;
 620         }
 621         /* now issue sense Interrupt and status command
 622          * assuming only one drive present (drive 0) */
 623         pCMD->dma=0; /* we don't use any dma at all */
 624         for(i=0;i<4;i++) {
 625                 /* issue sense interrupt for all 4 possible drives */
 626                 pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
 627                 if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
 628                         PRINTF("Sense Interrupt for drive %d failed\n",i);
 629                 }
 630         }
 631         /* issue the configure command */
 632         pCMD->drive=drive;
 633         select_fdc_drive(pCMD);
 634         pCMD->cmd[COMMAND]=FDC_CMD_CONFIGURE;
 635         if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
 636                 PRINTF(" configure timeout\n");
 637                 stop_fdc_drive(pCMD);
 638                 return FALSE;
 639         }
 640         /* issue specify command */
 641         pCMD->cmd[COMMAND]=FDC_CMD_SPECIFY;
 642         if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
 643                 PRINTF(" specify timeout\n");
 644                 stop_fdc_drive(pCMD);
 645                 return FALSE;
 646
 647         }
 648         /* then, we clear the reset in the DOR */
 649         /* fdc_check_drive(pCMD,pFG);   */
 650         /*      write_fdc_reg(FDC_DOR,0x04); */
 651         return TRUE;
 652 }
 653 #endif /* ((CONFIG_COMMANDS & CFG_CMD_FDC)||(CONFIG_COMMANDS & CFG_CMD_FDOS))*/
 654
 655 #if (CONFIG_COMMANDS & CFG_CMD_FDOS)
 656
 657 /* Low level functions for the Floppy-DOS layer                              */
 658
 659 /**************************************************************************
 660 * int fdc_fdos_init
 661 * initialize the FDC layer
 662 *
 663 */
 664 int fdc_fdos_init (int drive)
 665 {
 666         FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
 667         FDC_COMMAND_STRUCT *pCMD = &cmd;
 668
 669         /* setup FDC and scan for drives  */
 670         if(fdc_setup(drive,pCMD,pFG)==FALSE) {
 671                 printf("\n** Error in setup FDC **\n");
 672                 return FALSE;
 673         }
 674         if(fdc_check_drive(pCMD,pFG)==FALSE) {
 675                 printf("\n** Error in check_drives **\n");
 676                 return FALSE;
 677         }
 678         if((pCMD->flags&(1<<drive))==0) {
 679                 /* drive not available */
 680                 printf("\n** Drive %d not available **\n",drive);
 681                 return FALSE;
 682         }
 683         if((pCMD->flags&(0x10<<drive))==0) {
 684                 /* no disk inserted */
 685                 printf("\n** No disk inserted in drive %d **\n",drive);
 686                 return FALSE;
 687         }
 688         /* ok, we have a valid source */
 689         pCMD->drive=drive;
 690
 691         /* read first block */
 692         pCMD->blnr=0;
 693         return TRUE;
 694 }
 695 /**************************************************************************
 696 * int fdc_fdos_seek
 697 * parameter is a block number
 698 */
 699 int fdc_fdos_seek (int where)
 700 {
 701         FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
 702         FDC_COMMAND_STRUCT *pCMD = &cmd;
 703
 704         pCMD -> blnr = where ;
 705         return (fdc_seek (pCMD, pFG));
 706 }
 707 /**************************************************************************
 708 * int fdc_fdos_read
 709 *  the length is in block number
 710 */
 711 int fdc_fdos_read (void *buffer, int len)
 712 {
 713         FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
 714         FDC_COMMAND_STRUCT *pCMD = &cmd;
 715
 716         return (fdc_read_data (buffer, len, pCMD, pFG));
 717 }
 718 #endif  /* (CONFIG_COMMANDS & CFG_CMD_FDOS)                                  */
 719
 720 #if (CONFIG_COMMANDS & CFG_CMD_FDC)
 721 /****************************************************************************
 722  * main routine do_fdcboot
 723  */
 724 int do_fdcboot (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 725 {
 726         FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
 727         FDC_COMMAND_STRUCT *pCMD = &cmd;
 728         unsigned long addr,imsize;
 729         image_header_t *hdr;  /* used for fdc boot */
 730         unsigned char boot_drive;
 731         int i,nrofblk;
 732         char *ep;
 733         int rcode = 0;
 734
 735         switch (argc) {
 736         case 1:
 737                 addr = CFG_LOAD_ADDR;
 738                 boot_drive=CFG_FDC_DRIVE_NUMBER;
 739                 break;
 740         case 2:
 741                 addr = simple_strtoul(argv[1], NULL, 16);
 742                 boot_drive=CFG_FDC_DRIVE_NUMBER;
 743                 break;
 744         case 3:
 745                 addr = simple_strtoul(argv[1], NULL, 16);
 746                 boot_drive=simple_strtoul(argv[2], NULL, 10);
 747                 break;
 748         default:
 749                 printf ("Usage:\n%s\n", cmdtp->usage);
 750                 return 1;
 751         }
 752         /* setup FDC and scan for drives  */
 753         if(fdc_setup(boot_drive,pCMD,pFG)==FALSE) {
 754                 printf("\n** Error in setup FDC **\n");
 755                 return 1;
 756         }
 757         if(fdc_check_drive(pCMD,pFG)==FALSE) {
 758                 printf("\n** Error in check_drives **\n");
 759                 return 1;
 760         }
 761         if((pCMD->flags&(1<<boot_drive))==0) {
 762                 /* drive not available */
 763                 printf("\n** Drive %d not availabe **\n",boot_drive);
 764                 return 1;
 765         }
 766         if((pCMD->flags&(0x10<<boot_drive))==0) {
 767                 /* no disk inserted */
 768                 printf("\n** No disk inserted in drive %d **\n",boot_drive);
 769                 return 1;
 770         }
 771         /* ok, we have a valid source */
 772         pCMD->drive=boot_drive;
 773         /* read first block */
 774         pCMD->blnr=0;
 775         if(fdc_read_data((unsigned char *)addr,1,pCMD,pFG)==FALSE) {
 776                 printf("\nRead error:");
 777                 for(i=0;i<7;i++)
 778                         printf("result%d: 0x%02X\n",i,pCMD->result[i]);
 779                 return 1;
 780         }
 781         hdr = (image_header_t *)addr;
 782         if (hdr->ih_magic  != IH_MAGIC) {
 783                 printf ("Bad Magic Number\n");
 784                 return 1;
 785         }
 786         print_image_hdr(hdr);
 787
 788         imsize= hdr->ih_size+sizeof(image_header_t);
 789         nrofblk=imsize/512;
 790         if((imsize%512)>0)
 791                 nrofblk++;
 792         printf("Loading %ld Bytes (%d blocks) at 0x%08lx..\n",imsize,nrofblk,addr);
 793         pCMD->blnr=0;
 794         if(fdc_read_data((unsigned char *)addr,nrofblk,pCMD,pFG)==FALSE) {
 795                 /* read image block */
 796                 printf("\nRead error:");
 797                 for(i=0;i<7;i++)
 798                         printf("result%d: 0x%02X\n",i,pCMD->result[i]);
 799                 return 1;
 800         }
 801         printf("OK %ld Bytes loaded.\n",imsize);
 802
 803         flush_cache (addr, imsize);
 804         /* Loading ok, update default load address */
 805
 806         load_addr = addr;
 807         if(hdr->ih_type  == IH_TYPE_KERNEL) {
 808                 /* Check if we should attempt an auto-start */
 809                 if (((ep = getenv("autostart")) != NULL) && (strcmp(ep,"yes") == 0)) {
 810                         char *local_args[2];
 811                         extern int do_bootm (cmd_tbl_t *, int, int, char *[]);
 812
 813                         local_args[0] = argv[0];
 814                         local_args[1] = NULL;
 815
 816                         printf ("Automatic boot of image at addr 0x%08lX ...\n", addr);
 817
 818                         do_bootm (cmdtp, 0, 1, local_args);
 819                         rcode ++;
 820                 }
 821         }
 822         return rcode;
 823 }
 824
 825
 826
 827 #endif /* CONFIG_COMMANDS & CFG_CMD_FDC */
 828
 829