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)
  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 = (volatile unsigned char *)(CFG_ISA_IO_BASE_ADDRESS + (addr * CFG_ISA_IO_STRIDE) + CFG_ISA_IO_OFFSET);
 196
 197         return val [0];
 198 }
 199
 200 /* writes a Register of the FDC */
 201 void write_fdc_reg(unsigned int addr, unsigned char val)
 202 {
 203         volatile unsigned char *tmp = (volatile unsigned char *)(CFG_ISA_IO_BASE_ADDRESS + (addr * CFG_ISA_IO_STRIDE) + CFG_ISA_IO_OFFSET);
 204         tmp[0]=val;
 205 }
 206
 207 /* waits for an interrupt (polling) */
 208 int wait_for_fdc_int(void)
 209 {
 210         unsigned long timeout;
 211         timeout = FDC_TIME_OUT;
 212         while((read_fdc_reg(FDC_SRA)&0x80)==0) {
 213                 timeout--;
 214                 udelay(10);
 215                 if(timeout==0) /* timeout occured */
 216                         return FALSE;
 217         }
 218         return TRUE;
 219 }
 220
 221
 222 /* reads a byte from the FIFO of the FDC and checks direction and RQM bit
 223    of the MSR. returns -1 if timeout, or byte if ok */
 224 int read_fdc_byte(void)
 225 {
 226         unsigned long timeout;
 227         timeout = FDC_TIME_OUT;
 228         while((read_fdc_reg(FDC_MSR)&0xC0)!=0xC0) {
 229                 /* direction out and ready */
 230                 udelay(10);
 231                 timeout--;
 232                 if(timeout==0) /* timeout occured */
 233                         return -1;
 234         }
 235         return read_fdc_reg(FDC_FIFO);
 236 }
 237
 238 /* if the direction of the FIFO is wrong, this routine is used to
 239    empty the FIFO. Should _not_ be used */
 240 int fdc_need_more_output(void)
 241 {
 242         unsigned char c;
 243         while((read_fdc_reg(FDC_MSR)&0xC0)==0xC0)       {
 244                         c=(unsigned char)read_fdc_byte();
 245                         printf("Error: more output: %x\n",c);
 246         }
 247         return TRUE;
 248 }
 249
 250
 251 /* writes a byte to the FIFO of the FDC and checks direction and RQM bit
 252    of the MSR */
 253 int write_fdc_byte(unsigned char val)
 254 {
 255         unsigned long timeout;
 256         timeout = FDC_TIME_OUT;
 257         while((read_fdc_reg(FDC_MSR)&0xC0)!=0x80) {
 258                 /* direction in and ready for byte */
 259                 timeout--;
 260                 udelay(10);
 261                 fdc_need_more_output();
 262                 if(timeout==0) /* timeout occured */
 263                         return FALSE;
 264         }
 265         write_fdc_reg(FDC_FIFO,val);
 266         return TRUE;
 267 }
 268
 269 /* sets up all FDC commands and issues it to the FDC. If
 270    the command causes direct results (no Execution Phase)
 271    the result is be read as well. */
 272
 273 int fdc_issue_cmd(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
 274 {
 275         int i;
 276         unsigned long head,track,sect,timeout;
 277         track = pCMD->blnr / (pFG->sect * pFG->head); /* track nr */
 278         sect =  pCMD->blnr % (pFG->sect * pFG->head); /* remaining blocks */
 279         head = sect / pFG->sect; /* head nr */
 280         sect =  sect % pFG->sect; /* remaining blocks */
 281         sect++; /* sectors are 1 based */
 282         PRINTF("Cmd 0x%02x Track %ld, Head %ld, Sector %ld, Drive %d (blnr %ld)\n",pCMD->cmd[0],track,head,sect,pCMD->drive,pCMD->blnr);
 283
 284         if(head|=0) { /* max heads = 2 */
 285                 pCMD->cmd[DRIVE]=pCMD->drive | 0x04; /* head 1 */
 286                 pCMD->cmd[HEAD]=(unsigned char) head; /* head register */
 287         }
 288         else {
 289                 pCMD->cmd[DRIVE]=pCMD->drive; /* head 0 */
 290                 pCMD->cmd[HEAD]=(unsigned char) head; /* head register */
 291         }
 292         pCMD->cmd[TRACK]=(unsigned char) track; /* track */
 293         switch (pCMD->cmd[COMMAND]) {
 294                 case FDC_CMD_READ:
 295                         pCMD->cmd[SECTOR]=(unsigned char) sect; /* sector */
 296                         pCMD->cmd[SECTOR_SIZE]=pFG->sect_code; /* sector size code */
 297                         pCMD->cmd[LAST_TRACK]=pFG->sect; /* End of track */
 298                         pCMD->cmd[GAP]=pFG->gap; /* gap */
 299                         pCMD->cmd[DTL]=0xFF; /* DTL */
 300                         pCMD->cmdlen=FDC_CMD_READ_LEN;
 301                         pCMD->cmd[COMMAND]|=(FDC_MFM_MODE<<6); /* set MFM bit */
 302                         pCMD->cmd[COMMAND]|=(FDC_SKIP_MODE<<5); /* set Skip bit */
 303                         pCMD->resultlen=0;  /* result only after execution */
 304                         break;
 305                 case FDC_CMD_SEEK:
 306                         pCMD->cmdlen=FDC_CMD_SEEK_LEN;
 307                         pCMD->resultlen=0;  /* no result */
 308                         break;
 309                 case FDC_CMD_CONFIGURE:
 310                         pCMD->cmd[CONFIG0]=0;
 311                         pCMD->cmd[CONFIG1]=FDC_CONFIGURE; /* FIFO Threshold, Poll, Enable FIFO */
 312                         pCMD->cmd[CONFIG2]=FDC_PRE_TRK;         /* Precompensation Track */
 313                         pCMD->cmdlen=FDC_CMD_CONFIGURE_LEN;
 314                         pCMD->resultlen=0;  /* no result */
 315                         break;
 316                 case FDC_CMD_SPECIFY:
 317                         pCMD->cmd[SPEC_HUTSRT]=pFG->spec1;
 318                         pCMD->cmd[SPEC_HLT]=(pFG->hlt)<<1; /* head load time */
 319                         if(pCMD->dma==0)
 320                                 pCMD->cmd[SPEC_HLT]|=0x1; /* no dma */
 321                         pCMD->cmdlen=FDC_CMD_SPECIFY_LEN;
 322                         pCMD->resultlen=0;  /* no result */
 323                         break;
 324                 case FDC_CMD_DUMP_REG:
 325                         pCMD->cmdlen=FDC_CMD_DUMP_REG_LEN;
 326                         pCMD->resultlen=10;  /* 10 byte result */
 327                         break;
 328                 case FDC_CMD_READ_ID:
 329                         pCMD->cmd[COMMAND]|=(FDC_MFM_MODE<<6); /* set MFM bit */
 330                         pCMD->cmdlen=FDC_CMD_READ_ID_LEN;
 331                         pCMD->resultlen=7;  /* 7 byte result */
 332                         break;
 333                 case FDC_CMD_RECALIBRATE:
 334                         pCMD->cmd[DRIVE]&=0x03; /* don't set the head bit */
 335                         pCMD->cmdlen=FDC_CMD_RECALIBRATE_LEN;
 336                         pCMD->resultlen=0;  /* no result */
 337                         break;
 338                         break;
 339                 case FDC_CMD_SENSE_INT:
 340                         pCMD->cmdlen=FDC_CMD_SENSE_INT_LEN;
 341                         pCMD->resultlen=2;
 342                         break;
 343         }
 344         for(i=0;i<pCMD->cmdlen;i++) {
 345                 /* PRINTF("write cmd%d = 0x%02X\n",i,pCMD->cmd[i]); */
 346                 if(write_fdc_byte(pCMD->cmd[i])==FALSE) {
 347                         PRINTF("Error: timeout while issue cmd%d\n",i);
 348                         return FALSE;
 349                 }
 350         }
 351         timeout=FDC_TIME_OUT;
 352         for(i=0;i<pCMD->resultlen;i++) {
 353                 while((read_fdc_reg(FDC_MSR)&0xC0)!=0xC0) {
 354                         timeout--;
 355                         if(timeout==0) {
 356                                 PRINTF(" timeout while reading result%d MSR=0x%02X\n",i,read_fdc_reg(FDC_MSR));
 357                                 return FALSE;
 358                         }
 359                 }
 360                 pCMD->result[i]=(unsigned char)read_fdc_byte();
 361         }
 362         return TRUE;
 363 }
 364
 365 /* selects the drive assigned in the cmd structur and
 366    switches on the Motor */
 367 void select_fdc_drive(FDC_COMMAND_STRUCT *pCMD)
 368 {
 369         unsigned char val;
 370
 371         val=(1<<(4+pCMD->drive))|pCMD->drive|0xC; /* set reset, dma gate and motor bits */
 372         if((read_fdc_reg(FDC_DOR)&val)!=val) {
 373                 write_fdc_reg(FDC_DOR,val);
 374                 for(val=0;val<255;val++)
 375                         udelay(500); /* wait some time to start motor */
 376         }
 377 }
 378
 379 /* switches off the Motor of the specified drive */
 380 void stop_fdc_drive(FDC_COMMAND_STRUCT *pCMD)
 381 {
 382         unsigned char val;
 383
 384         val=(1<<(4+pCMD->drive))|pCMD->drive; /* sets motor bits */
 385         write_fdc_reg(FDC_DOR,(read_fdc_reg(FDC_DOR)&~val));
 386 }
 387
 388 /* issues a recalibrate command, waits for interrupt and
 389  * issues a sense_interrupt */
 390 int fdc_recalibrate(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
 391 {
 392         pCMD->cmd[COMMAND]=FDC_CMD_RECALIBRATE;
 393         if(fdc_issue_cmd(pCMD,pFG)==FALSE)
 394                 return FALSE;
 395         while(wait_for_fdc_int()!=TRUE);
 396         pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
 397         return(fdc_issue_cmd(pCMD,pFG));
 398 }
 399
 400 /* issues a recalibrate command, waits for interrupt and
 401  * issues a sense_interrupt */
 402 int fdc_seek(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
 403 {
 404         pCMD->cmd[COMMAND]=FDC_CMD_SEEK;
 405         if(fdc_issue_cmd(pCMD,pFG)==FALSE)
 406                 return FALSE;
 407         while(wait_for_fdc_int()!=TRUE);
 408         pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
 409         return(fdc_issue_cmd(pCMD,pFG));
 410 }
 411
 412
 413 /* terminates current command, by not servicing the FIFO
 414  * waits for interrupt and fills in the result bytes */
 415 int fdc_terminate(FDC_COMMAND_STRUCT *pCMD)
 416 {
 417         int i;
 418         for(i=0;i<100;i++)
 419                 udelay(500); /* wait 500usec for fifo overrun */
 420         while((read_fdc_reg(FDC_SRA)&0x80)==0x00); /* wait as long as no int has occured */
 421         for(i=0;i<7;i++) {
 422                 pCMD->result[i]=(unsigned char)read_fdc_byte();
 423         }
 424         return TRUE;
 425 }
 426
 427 /* reads data from FDC, seek commands are issued automatic */
 428 int fdc_read_data(unsigned char *buffer, unsigned long blocks,FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
 429 {
 430   /* first seek to start address */
 431         unsigned long len,lastblk,readblk,i,timeout,ii,offset;
 432         unsigned char pcn,c,retriesrw,retriescal;
 433         unsigned char *bufferw; /* working buffer */
 434         int sect_size;
 435         int flags;
 436
 437         flags=disable_interrupts(); /* switch off all Interrupts */
 438         select_fdc_drive(pCMD); /* switch on drive */
 439         sect_size=0x080<<pFG->sect_code;
 440         retriesrw=0;
 441         retriescal=0;
 442         offset=0;
 443         if(fdc_seek(pCMD,pFG)==FALSE) {
 444                 stop_fdc_drive(pCMD);
 445                 enable_interrupts();
 446                 return FALSE;
 447         }
 448         if((pCMD->result[STATUS_0]&0x20)!=0x20) {
 449                 printf("Seek error Status: %02X\n",pCMD->result[STATUS_0]);
 450                 stop_fdc_drive(pCMD);
 451                 enable_interrupts();
 452                 return FALSE;
 453         }
 454         pcn=pCMD->result[STATUS_PCN]; /* current track */
 455         /* now determine the next seek point */
 456         lastblk=pCMD->blnr + blocks;
 457         /*      readblk=(pFG->head*pFG->sect)-(pCMD->blnr%(pFG->head*pFG->sect)); */
 458         readblk=pFG->sect-(pCMD->blnr%pFG->sect);
 459         PRINTF("1st nr of block possible read %ld start %ld\n",readblk,pCMD->blnr);
 460         if(readblk>blocks) /* is end within 1st track */
 461                 readblk=blocks; /* yes, correct it */
 462         PRINTF("we read %ld blocks start %ld\n",readblk,pCMD->blnr);
 463         bufferw=&buffer[0]; /* setup working buffer */
 464         do {
 465 retryrw:
 466                 len=sect_size * readblk;
 467                 pCMD->cmd[COMMAND]=FDC_CMD_READ;
 468                 if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
 469                         stop_fdc_drive(pCMD);
 470                         enable_interrupts();
 471                         return FALSE;
 472                 }
 473                 for (i=0;i<len;i++) {
 474                         timeout=FDC_TIME_OUT;
 475                         do {
 476                                 c=read_fdc_reg(FDC_MSR);
 477                                 if((c&0xC0)==0xC0) {
 478                                         bufferw[i]=read_fdc_reg(FDC_FIFO);
 479                                         break;
 480                                 }
 481                                 if((c&0xC0)==0x80) { /* output */
 482                                         PRINTF("Transfer error transfered: at %ld, MSR=%02X\n",i,c);
 483                                         if(i>6) {
 484                                                 for(ii=0;ii<7;ii++) {
 485                                                         pCMD->result[ii]=bufferw[(i-7+ii)];
 486                                                 } /* for */
 487                                         }
 488                                         if(retriesrw++>FDC_RW_RETRIES) {
 489                                                 if (retriescal++>FDC_CAL_RETRIES) {
 490                                                         stop_fdc_drive(pCMD);
 491                                                         enable_interrupts();
 492                                                         return FALSE;
 493                                                 }
 494                                                 else {
 495                                                         PRINTF(" trying to recalibrate Try %d\n",retriescal);
 496                                                         if(fdc_recalibrate(pCMD,pFG)==FALSE) {
 497                                                                 stop_fdc_drive(pCMD);
 498                                                                 enable_interrupts();
 499                                                                 return FALSE;
 500                                                         }
 501                                                         retriesrw=0;
 502                                                         goto retrycal;
 503                                                 } /* else >FDC_CAL_RETRIES */
 504                                         }
 505                                         else {
 506                                                 PRINTF("Read retry %d\n",retriesrw);
 507                                                 goto retryrw;
 508                                         } /* else >FDC_RW_RETRIES */
 509                                 }/* if output */
 510                                 timeout--;
 511                         }while(TRUE);
 512                 } /* for len */
 513                 /* the last sector of a track or all data has been read,
 514                  * we need to get the results */
 515                 fdc_terminate(pCMD);
 516                 offset+=(sect_size*readblk); /* set up buffer pointer */
 517                 bufferw=&buffer[offset];
 518                 pCMD->blnr+=readblk; /* update current block nr */
 519                 blocks-=readblk; /* update blocks */
 520                 if(blocks==0)
 521                         break; /* we are finish */
 522                 /* setup new read blocks */
 523                 /*      readblk=pFG->head*pFG->sect; */
 524                 readblk=pFG->sect;
 525                 if(readblk>blocks)
 526                         readblk=blocks;
 527 retrycal:
 528                 /* a seek is necessary */
 529                 if(fdc_seek(pCMD,pFG)==FALSE) {
 530                         stop_fdc_drive(pCMD);
 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                 pcn=pCMD->result[STATUS_PCN]; /* current track */
 540         }while(TRUE); /* start over */
 541         stop_fdc_drive(pCMD); /* switch off drive */
 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(FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
 592 {
 593
 594         int i;
 595
 596 #ifdef CFG_FDC_HW_INIT
 597         fdc_hw_init ();
 598 #endif
 599         /* first, we reset the FDC via the DOR */
 600         write_fdc_reg(FDC_DOR,0x00);
 601         for(i=0; i<255; i++) /* then we wait some time */
 602                 udelay(500);
 603         /* then, we clear the reset in the DOR */
 604         pCMD->drive=CFG_FDC_DRIVE_NUMBER;
 605         select_fdc_drive(pCMD);
 606         /* initialize the CCR */
 607         write_fdc_reg(FDC_CCR,pFG->rate);
 608         /* then initialize the DSR */
 609         write_fdc_reg(FDC_DSR,pFG->rate);
 610         if(wait_for_fdc_int()==FALSE) {
 611                         PRINTF("Time Out after writing CCR\n");
 612                         return FALSE;
 613         }
 614         /* now issue sense Interrupt and status command
 615          * assuming only one drive present (drive 0) */
 616         pCMD->dma=0; /* we don't use any dma at all */
 617         for(i=0;i<4;i++) {
 618                 /* issue sense interrupt for all 4 possible drives */
 619                 pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
 620                 if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
 621                         PRINTF("Sense Interrupt for drive %d failed\n",i);
 622                 }
 623         }
 624         /* assuming drive 0 for rest of configuration
 625          * issue the configure command */
 626         pCMD->drive=CFG_FDC_DRIVE_NUMBER;
 627         select_fdc_drive(pCMD);
 628         pCMD->cmd[COMMAND]=FDC_CMD_CONFIGURE;
 629         if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
 630                 PRINTF(" configure timeout\n");
 631                 stop_fdc_drive(pCMD);
 632                 return FALSE;
 633         }
 634         /* issue specify command */
 635         pCMD->cmd[COMMAND]=FDC_CMD_SPECIFY;
 636         if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
 637                 PRINTF(" specify timeout\n");
 638                 stop_fdc_drive(pCMD);
 639                 return FALSE;
 640
 641         }
 642         /* then, we clear the reset in the DOR */
 643         /* fdc_check_drive(pCMD,pFG);   */
 644         /*      write_fdc_reg(FDC_DOR,0x04); */
 645         return TRUE;
 646 }
 647
 648 /****************************************************************************
 649  * main routine do_fdcboot
 650  */
 651 int do_fdcboot (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 652 {
 653         FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
 654         FDC_COMMAND_STRUCT *pCMD = &cmd;
 655         unsigned long addr,imsize;
 656         image_header_t *hdr;  /* used for fdc boot */
 657         unsigned char boot_drive;
 658         int i,nrofblk;
 659         char *ep;
 660         int rcode = 0;
 661
 662         switch (argc) {
 663         case 1:
 664                 addr = CFG_LOAD_ADDR;
 665                 boot_drive=CFG_FDC_DRIVE_NUMBER;
 666                 break;
 667         case 2:
 668                 addr = simple_strtoul(argv[1], NULL, 16);
 669                 boot_drive=CFG_FDC_DRIVE_NUMBER;
 670                 break;
 671         case 3:
 672                 addr = simple_strtoul(argv[1], NULL, 16);
 673                 boot_drive=simple_strtoul(argv[2], NULL, 10);
 674                 break;
 675         default:
 676                 printf ("Usage:\n%s\n", cmdtp->usage);
 677                 return 1;
 678         }
 679         /* setup FDC and scan for drives  */
 680         if(fdc_setup(pCMD,pFG)==FALSE) {
 681                 printf("\n** Error in setup FDC **\n");
 682                 return 1;
 683         }
 684         if(fdc_check_drive(pCMD,pFG)==FALSE) {
 685                 printf("\n** Error in check_drives **\n");
 686                 return 1;
 687         }
 688         if((pCMD->flags&(1<<boot_drive))==0) {
 689                 /* drive not available */
 690                 printf("\n** Drive %d not availabe **\n",boot_drive);
 691                 return 1;
 692         }
 693         if((pCMD->flags&(0x10<<boot_drive))==0) {
 694                 /* no disk inserted */
 695                 printf("\n** No disk inserted in drive %d **\n",boot_drive);
 696                 return 1;
 697         }
 698         /* ok, we have a valid source */
 699         pCMD->drive=boot_drive;
 700         /* read first block */
 701         pCMD->blnr=0;
 702         if(fdc_read_data((unsigned char *)addr,1,pCMD,pFG)==FALSE) {
 703                 printf("\nRead error:");
 704                 for(i=0;i<7;i++)
 705                         printf("result%d: 0x%02X\n",i,pCMD->result[i]);
 706                 return 1;
 707         }
 708         hdr = (image_header_t *)addr;
 709         if (hdr->ih_magic  != IH_MAGIC) {
 710                 printf ("Bad Magic Number\n");
 711                 return 1;
 712         }
 713         print_image_hdr(hdr);
 714
 715         imsize= hdr->ih_size+sizeof(image_header_t);
 716         nrofblk=imsize/512;
 717         if((imsize%512)>0)
 718                 nrofblk++;
 719         printf("Loading %ld Bytes (%d blocks) at 0x%08lx..\n",imsize,nrofblk,addr);
 720         pCMD->blnr=0;
 721         if(fdc_read_data((unsigned char *)addr,nrofblk,pCMD,pFG)==FALSE) {
 722                 /* read image block */
 723                 printf("\nRead error:");
 724                 for(i=0;i<7;i++)
 725                         printf("result%d: 0x%02X\n",i,pCMD->result[i]);
 726                 return 1;
 727         }
 728         printf("OK %ld Bytes loaded.\n",imsize);
 729
 730         flush_cache (addr, imsize);
 731         /* Loading ok, update default load address */
 732
 733         load_addr = addr;
 734         if(hdr->ih_type  == IH_TYPE_KERNEL) {
 735                 /* Check if we should attempt an auto-start */
 736                 if (((ep = getenv("autostart")) != NULL) && (strcmp(ep,"yes") == 0)) {
 737                         char *local_args[2];
 738                         extern int do_bootm (cmd_tbl_t *, int, int, char *[]);
 739
 740                         local_args[0] = argv[0];
 741                         local_args[1] = NULL;
 742
 743                         printf ("Automatic boot of image at addr 0x%08lX ...\n", addr);
 744
 745                         do_bootm (cmdtp, 0, 1, local_args);
 746                         rcode ++;
 747                 }
 748         }
 749         return rcode;
 750 }
 751
 752
 753
 754 #endif /* CONFIG_COMMANDS & CFG_CMD_FDC */
 755
 756