cmd/fdc.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2001
   4  * Denis Peter, MPL AG, d.peter@mpl.ch.
   5  */
   6 /*
   7  * Floppy Disk support
   8  */
   9
  10 #include <common.h>
  11 #include <config.h>
  12 #include <command.h>
  13 #include <image.h>
  14
  15
  16 #undef  FDC_DEBUG
  17
  18 #ifdef  FDC_DEBUG
  19 #define PRINTF(fmt,args...)     printf (fmt ,##args)
  20 #else
  21 #define PRINTF(fmt,args...)
  22 #endif
  23
  24 /*#if defined(CONFIG_CMD_DATE) */
  25 /*#include <rtc.h> */
  26 /*#endif */
  27
  28 typedef struct {
  29         int             flags;          /* connected drives ect */
  30         unsigned long   blnr;           /* Logical block nr */
  31         uchar           drive;          /* drive no */
  32         uchar           cmdlen;         /* cmd length */
  33         uchar           cmd[16];        /* cmd desc */
  34         uchar           dma;            /* if > 0 dma enabled */
  35         uchar           result[11];     /* status information */
  36         uchar           resultlen;      /* lenght of result */
  37 } FDC_COMMAND_STRUCT;
  38
  39 /* flags: only the lower 8bit used:
  40  * bit 0 if set drive 0 is present
  41  * bit 1 if set drive 1 is present
  42  * bit 2 if set drive 2 is present
  43  * bit 3 if set drive 3 is present
  44  * bit 4 if set disk in drive 0 is inserted
  45  * bit 5 if set disk in drive 1 is inserted
  46  * bit 6 if set disk in drive 2 is inserted
  47  * bit 7 if set disk in drive 4 is inserted
  48  */
  49
  50 /* cmd indexes */
  51 #define COMMAND                 0
  52 #define DRIVE                   1
  53 #define CONFIG0                 1
  54 #define SPEC_HUTSRT             1
  55 #define TRACK                   2
  56 #define CONFIG1                 2
  57 #define SPEC_HLT                2
  58 #define HEAD                    3
  59 #define CONFIG2                 3
  60 #define SECTOR                  4
  61 #define SECTOR_SIZE             5
  62 #define LAST_TRACK              6
  63 #define GAP                     7
  64 #define DTL                     8
  65 /* result indexes */
  66 #define STATUS_0                0
  67 #define STATUS_PCN              1
  68 #define STATUS_1                1
  69 #define STATUS_2                2
  70 #define STATUS_TRACK            3
  71 #define STATUS_HEAD             4
  72 #define STATUS_SECT             5
  73 #define STATUS_SECT_SIZE        6
  74
  75
  76 /* Register addresses */
  77 #define FDC_BASE        0x3F0
  78 #define FDC_SRA         FDC_BASE + 0    /* Status Register A */
  79 #define FDC_SRB         FDC_BASE + 1    /* Status Register B */
  80 #define FDC_DOR         FDC_BASE + 2    /* Digital Output Register */
  81 #define FDC_TDR         FDC_BASE + 3    /* Tape Drive Register */
  82 #define FDC_DSR         FDC_BASE + 4    /* Data rate Register */
  83 #define FDC_MSR         FDC_BASE + 4    /* Main Status Register */
  84 #define FDC_FIFO        FDC_BASE + 5    /* FIFO */
  85 #define FDC_DIR         FDC_BASE + 6    /* Digital Input Register */
  86 #define FDC_CCR         FDC_BASE + 7    /* Configuration Control */
  87 /* Commands */
  88 #define FDC_CMD_SENSE_INT       0x08
  89 #define FDC_CMD_CONFIGURE       0x13
  90 #define FDC_CMD_SPECIFY         0x03
  91 #define FDC_CMD_RECALIBRATE     0x07
  92 #define FDC_CMD_READ            0x06
  93 #define FDC_CMD_READ_TRACK      0x02
  94 #define FDC_CMD_READ_ID         0x0A
  95 #define FDC_CMD_DUMP_REG        0x0E
  96 #define FDC_CMD_SEEK            0x0F
  97
  98 #define FDC_CMD_SENSE_INT_LEN   0x01
  99 #define FDC_CMD_CONFIGURE_LEN   0x04
 100 #define FDC_CMD_SPECIFY_LEN     0x03
 101 #define FDC_CMD_RECALIBRATE_LEN 0x02
 102 #define FDC_CMD_READ_LEN        0x09
 103 #define FDC_CMD_READ_TRACK_LEN  0x09
 104 #define FDC_CMD_READ_ID_LEN     0x02
 105 #define FDC_CMD_DUMP_REG_LEN    0x01
 106 #define FDC_CMD_SEEK_LEN        0x03
 107
 108 #define FDC_FIFO_THR            0x0C
 109 #define FDC_FIFO_DIS            0x00
 110 #define FDC_IMPLIED_SEEK        0x01
 111 #define FDC_POLL_DIS            0x00
 112 #define FDC_PRE_TRK             0x00
 113 #define FDC_CONFIGURE           FDC_FIFO_THR | (FDC_POLL_DIS<<4) | (FDC_FIFO_DIS<<5) | (FDC_IMPLIED_SEEK << 6)
 114 #define FDC_MFM_MODE            0x01 /* MFM enable */
 115 #define FDC_SKIP_MODE           0x00 /* skip enable */
 116
 117 #define FDC_TIME_OUT 100000 /* time out */
 118 #define FDC_RW_RETRIES          3 /* read write retries */
 119 #define FDC_CAL_RETRIES         3 /* calibration and seek retries */
 120
 121
 122 /* Disk structure */
 123 typedef struct  {
 124         unsigned int size;      /* nr of sectors total */
 125         unsigned int sect;      /* sectors per track */
 126         unsigned int head;      /* nr of heads */
 127         unsigned int track;     /* nr of tracks */
 128         unsigned int stretch;   /* !=0 means double track steps */
 129         unsigned char   gap;    /* gap1 size */
 130         unsigned char   rate;   /* data rate. |= 0x40 for perpendicular */
 131         unsigned char   spec1;  /* stepping rate, head unload time */
 132         unsigned char   fmt_gap;/* gap2 size */
 133         unsigned char hlt;      /* head load time */
 134         unsigned char sect_code;/* Sector Size code */
 135         const char      * name; /* used only for predefined formats */
 136 } FD_GEO_STRUCT;
 137
 138
 139 /* supported Floppy types (currently only one) */
 140 const static FD_GEO_STRUCT floppy_type[2] = {
 141         { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,16,2,"H1440" },    /*  7 1.44MB 3.5"   */
 142         {    0, 0,0, 0,0,0x00,0x00,0x00,0x00, 0,0,NULL    },    /*  end of table    */
 143 };
 144
 145 static FDC_COMMAND_STRUCT cmd; /* global command struct */
 146
 147 /* If the boot drive number is undefined, we assume it's drive 0             */
 148 #ifndef CONFIG_SYS_FDC_DRIVE_NUMBER
 149 #define CONFIG_SYS_FDC_DRIVE_NUMBER 0
 150 #endif
 151
 152 /* Hardware access */
 153 #ifndef CONFIG_SYS_ISA_IO_STRIDE
 154 #define CONFIG_SYS_ISA_IO_STRIDE 1
 155 #endif
 156
 157 #ifndef CONFIG_SYS_ISA_IO_OFFSET
 158 #define CONFIG_SYS_ISA_IO_OFFSET 0
 159 #endif
 160
 161 /* Supporting Functions */
 162 /* reads a Register of the FDC */
 163 unsigned char read_fdc_reg(unsigned int addr)
 164 {
 165         volatile unsigned char *val =
 166                 (volatile unsigned char *)(CONFIG_SYS_ISA_IO_BASE_ADDRESS +
 167                                            (addr * CONFIG_SYS_ISA_IO_STRIDE) +
 168                                            CONFIG_SYS_ISA_IO_OFFSET);
 169
 170         return val [0];
 171 }
 172
 173 /* writes a Register of the FDC */
 174 void write_fdc_reg(unsigned int addr, unsigned char val)
 175 {
 176         volatile unsigned char *tmp =
 177                 (volatile unsigned char *)(CONFIG_SYS_ISA_IO_BASE_ADDRESS +
 178                                            (addr * CONFIG_SYS_ISA_IO_STRIDE) +
 179                                            CONFIG_SYS_ISA_IO_OFFSET);
 180         tmp[0]=val;
 181 }
 182
 183 /* waits for an interrupt (polling) */
 184 int wait_for_fdc_int(void)
 185 {
 186         unsigned long timeout;
 187         timeout = FDC_TIME_OUT;
 188         while((read_fdc_reg(FDC_SRA)&0x80)==0) {
 189                 timeout--;
 190                 udelay(10);
 191                 if(timeout==0) /* timeout occurred */
 192                         return false;
 193         }
 194         return true;
 195 }
 196
 197 /* reads a byte from the FIFO of the FDC and checks direction and RQM bit
 198    of the MSR. returns -1 if timeout, or byte if ok */
 199 int read_fdc_byte(void)
 200 {
 201         unsigned long timeout;
 202         timeout = FDC_TIME_OUT;
 203         while((read_fdc_reg(FDC_MSR)&0xC0)!=0xC0) {
 204                 /* direction out and ready */
 205                 udelay(10);
 206                 timeout--;
 207                 if(timeout==0) /* timeout occurred */
 208                         return -1;
 209         }
 210         return read_fdc_reg(FDC_FIFO);
 211 }
 212
 213 /* if the direction of the FIFO is wrong, this routine is used to
 214    empty the FIFO. Should _not_ be used */
 215 int fdc_need_more_output(void)
 216 {
 217         unsigned char c;
 218         while((read_fdc_reg(FDC_MSR)&0xC0)==0xC0)       {
 219                         c=(unsigned char)read_fdc_byte();
 220                         printf("Error: more output: %x\n",c);
 221         }
 222         return true;
 223 }
 224
 225
 226 /* writes a byte to the FIFO of the FDC and checks direction and RQM bit
 227    of the MSR */
 228 int write_fdc_byte(unsigned char val)
 229 {
 230         unsigned long timeout;
 231         timeout = FDC_TIME_OUT;
 232         while((read_fdc_reg(FDC_MSR)&0xC0)!=0x80) {
 233                 /* direction in and ready for byte */
 234                 timeout--;
 235                 udelay(10);
 236                 fdc_need_more_output();
 237                 if(timeout==0) /* timeout occurred */
 238                         return false;
 239         }
 240         write_fdc_reg(FDC_FIFO,val);
 241         return true;
 242 }
 243
 244 /* sets up all FDC commands and issues it to the FDC. If
 245    the command causes direct results (no Execution Phase)
 246    the result is be read as well. */
 247
 248 int fdc_issue_cmd(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
 249 {
 250         int i;
 251         unsigned long head,track,sect,timeout;
 252         track = pCMD->blnr / (pFG->sect * pFG->head); /* track nr */
 253         sect =  pCMD->blnr % (pFG->sect * pFG->head); /* remaining blocks */
 254         head = sect / pFG->sect; /* head nr */
 255         sect =  sect % pFG->sect; /* remaining blocks */
 256         sect++; /* sectors are 1 based */
 257         PRINTF("Cmd 0x%02x Track %ld, Head %ld, Sector %ld, Drive %d (blnr %ld)\n",
 258                 pCMD->cmd[0],track,head,sect,pCMD->drive,pCMD->blnr);
 259
 260         if(head|=0) { /* max heads = 2 */
 261                 pCMD->cmd[DRIVE]=pCMD->drive | 0x04; /* head 1 */
 262                 pCMD->cmd[HEAD]=(unsigned char) head; /* head register */
 263         }
 264         else {
 265                 pCMD->cmd[DRIVE]=pCMD->drive; /* head 0 */
 266                 pCMD->cmd[HEAD]=(unsigned char) head; /* head register */
 267         }
 268         pCMD->cmd[TRACK]=(unsigned char) track; /* track */
 269         switch (pCMD->cmd[COMMAND]) {
 270                 case FDC_CMD_READ:
 271                         pCMD->cmd[SECTOR]=(unsigned char) sect; /* sector */
 272                         pCMD->cmd[SECTOR_SIZE]=pFG->sect_code; /* sector size code */
 273                         pCMD->cmd[LAST_TRACK]=pFG->sect; /* End of track */
 274                         pCMD->cmd[GAP]=pFG->gap; /* gap */
 275                         pCMD->cmd[DTL]=0xFF; /* DTL */
 276                         pCMD->cmdlen=FDC_CMD_READ_LEN;
 277                         pCMD->cmd[COMMAND]|=(FDC_MFM_MODE<<6); /* set MFM bit */
 278                         pCMD->cmd[COMMAND]|=(FDC_SKIP_MODE<<5); /* set Skip bit */
 279                         pCMD->resultlen=0;  /* result only after execution */
 280                         break;
 281                 case FDC_CMD_SEEK:
 282                         pCMD->cmdlen=FDC_CMD_SEEK_LEN;
 283                         pCMD->resultlen=0;  /* no result */
 284                         break;
 285                 case FDC_CMD_CONFIGURE:
 286                         pCMD->cmd[CONFIG0]=0;
 287                         pCMD->cmd[CONFIG1]=FDC_CONFIGURE; /* FIFO Threshold, Poll, Enable FIFO */
 288                         pCMD->cmd[CONFIG2]=FDC_PRE_TRK; /* Precompensation Track */
 289                         pCMD->cmdlen=FDC_CMD_CONFIGURE_LEN;
 290                         pCMD->resultlen=0;  /* no result */
 291                         break;
 292                 case FDC_CMD_SPECIFY:
 293                         pCMD->cmd[SPEC_HUTSRT]=pFG->spec1;
 294                         pCMD->cmd[SPEC_HLT]=(pFG->hlt)<<1; /* head load time */
 295                         if(pCMD->dma==0)
 296                                 pCMD->cmd[SPEC_HLT]|=0x1; /* no dma */
 297                         pCMD->cmdlen=FDC_CMD_SPECIFY_LEN;
 298                         pCMD->resultlen=0;  /* no result */
 299                         break;
 300                 case FDC_CMD_DUMP_REG:
 301                         pCMD->cmdlen=FDC_CMD_DUMP_REG_LEN;
 302                         pCMD->resultlen=10;  /* 10 byte result */
 303                         break;
 304                 case FDC_CMD_READ_ID:
 305                         pCMD->cmd[COMMAND]|=(FDC_MFM_MODE<<6); /* set MFM bit */
 306                         pCMD->cmdlen=FDC_CMD_READ_ID_LEN;
 307                         pCMD->resultlen=7;  /* 7 byte result */
 308                         break;
 309                 case FDC_CMD_RECALIBRATE:
 310                         pCMD->cmd[DRIVE]&=0x03; /* don't set the head bit */
 311                         pCMD->cmdlen=FDC_CMD_RECALIBRATE_LEN;
 312                         pCMD->resultlen=0;  /* no result */
 313                         break;
 314                         break;
 315                 case FDC_CMD_SENSE_INT:
 316                         pCMD->cmdlen=FDC_CMD_SENSE_INT_LEN;
 317                         pCMD->resultlen=2;
 318                         break;
 319         }
 320         for(i=0;i<pCMD->cmdlen;i++) {
 321                 /* PRINTF("write cmd%d = 0x%02X\n",i,pCMD->cmd[i]); */
 322                 if (write_fdc_byte(pCMD->cmd[i]) == false) {
 323                         PRINTF("Error: timeout while issue cmd%d\n",i);
 324                         return false;
 325                 }
 326         }
 327         timeout=FDC_TIME_OUT;
 328         for(i=0;i<pCMD->resultlen;i++) {
 329                 while((read_fdc_reg(FDC_MSR)&0xC0)!=0xC0) {
 330                         timeout--;
 331                         if(timeout==0) {
 332                                 PRINTF(" timeout while reading result%d MSR=0x%02X\n",i,read_fdc_reg(FDC_MSR));
 333                                 return false;
 334                         }
 335                 }
 336                 pCMD->result[i]=(unsigned char)read_fdc_byte();
 337         }
 338         return true;
 339 }
 340
 341 /* selects the drive assigned in the cmd structur and
 342    switches on the Motor */
 343 void select_fdc_drive(FDC_COMMAND_STRUCT *pCMD)
 344 {
 345         unsigned char val;
 346
 347         val=(1<<(4+pCMD->drive))|pCMD->drive|0xC; /* set reset, dma gate and motor bits */
 348         if((read_fdc_reg(FDC_DOR)&val)!=val) {
 349                 write_fdc_reg(FDC_DOR,val);
 350                 for(val=0;val<255;val++)
 351                         udelay(500); /* wait some time to start motor */
 352         }
 353 }
 354
 355 /* switches off the Motor of the specified drive */
 356 void stop_fdc_drive(FDC_COMMAND_STRUCT *pCMD)
 357 {
 358         unsigned char val;
 359
 360         val=(1<<(4+pCMD->drive))|pCMD->drive; /* sets motor bits */
 361         write_fdc_reg(FDC_DOR,(read_fdc_reg(FDC_DOR)&~val));
 362 }
 363
 364 /* issues a recalibrate command, waits for interrupt and
 365  * issues a sense_interrupt */
 366 int fdc_recalibrate(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
 367 {
 368         pCMD->cmd[COMMAND]=FDC_CMD_RECALIBRATE;
 369         if (fdc_issue_cmd(pCMD, pFG) == false)
 370                 return false;
 371         while (wait_for_fdc_int() != true);
 372
 373         pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
 374         return(fdc_issue_cmd(pCMD,pFG));
 375 }
 376
 377 /* issues a recalibrate command, waits for interrupt and
 378  * issues a sense_interrupt */
 379 int fdc_seek(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
 380 {
 381         pCMD->cmd[COMMAND]=FDC_CMD_SEEK;
 382         if (fdc_issue_cmd(pCMD, pFG) == false)
 383                 return false;
 384         while (wait_for_fdc_int() != true);
 385
 386         pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
 387         return(fdc_issue_cmd(pCMD,pFG));
 388 }
 389
 390 /* terminates current command, by not servicing the FIFO
 391  * waits for interrupt and fills in the result bytes */
 392 int fdc_terminate(FDC_COMMAND_STRUCT *pCMD)
 393 {
 394         int i;
 395         for(i=0;i<100;i++)
 396                 udelay(500); /* wait 500usec for fifo overrun */
 397         while((read_fdc_reg(FDC_SRA)&0x80)==0x00); /* wait as long as no int has occurred */
 398         for(i=0;i<7;i++) {
 399                 pCMD->result[i]=(unsigned char)read_fdc_byte();
 400         }
 401         return true;
 402 }
 403
 404 /* reads data from FDC, seek commands are issued automatic */
 405 int fdc_read_data(unsigned char *buffer, unsigned long blocks,FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
 406 {
 407   /* first seek to start address */
 408         unsigned long len,readblk,i,timeout,ii,offset;
 409         unsigned char c,retriesrw,retriescal;
 410         unsigned char *bufferw; /* working buffer */
 411         int sect_size;
 412         int flags;
 413
 414         flags=disable_interrupts(); /* switch off all Interrupts */
 415         select_fdc_drive(pCMD); /* switch on drive */
 416         sect_size=0x080<<pFG->sect_code;
 417         retriesrw=0;
 418         retriescal=0;
 419         offset=0;
 420         if (fdc_seek(pCMD, pFG) == false) {
 421                 stop_fdc_drive(pCMD);
 422                 if (flags)
 423                         enable_interrupts();
 424                 return false;
 425         }
 426         if((pCMD->result[STATUS_0]&0x20)!=0x20) {
 427                 printf("Seek error Status: %02X\n",pCMD->result[STATUS_0]);
 428                 stop_fdc_drive(pCMD);
 429                 if (flags)
 430                         enable_interrupts();
 431                 return false;
 432         }
 433         /* now determine the next seek point */
 434         /*      lastblk=pCMD->blnr + blocks; */
 435         /*      readblk=(pFG->head*pFG->sect)-(pCMD->blnr%(pFG->head*pFG->sect)); */
 436         readblk=pFG->sect-(pCMD->blnr%pFG->sect);
 437         PRINTF("1st nr of block possible read %ld start %ld\n",readblk,pCMD->blnr);
 438         if(readblk>blocks) /* is end within 1st track */
 439                 readblk=blocks; /* yes, correct it */
 440         PRINTF("we read %ld blocks start %ld\n",readblk,pCMD->blnr);
 441         bufferw = &buffer[0]; /* setup working buffer */
 442         do {
 443 retryrw:
 444                 len=sect_size * readblk;
 445                 pCMD->cmd[COMMAND]=FDC_CMD_READ;
 446                 if (fdc_issue_cmd(pCMD, pFG) == false) {
 447                         stop_fdc_drive(pCMD);
 448                         if (flags)
 449                                 enable_interrupts();
 450                         return false;
 451                 }
 452                 for (i=0;i<len;i++) {
 453                         timeout=FDC_TIME_OUT;
 454                         do {
 455                                 c=read_fdc_reg(FDC_MSR);
 456                                 if((c&0xC0)==0xC0) {
 457                                         bufferw[i]=read_fdc_reg(FDC_FIFO);
 458                                         break;
 459                                 }
 460                                 if((c&0xC0)==0x80) { /* output */
 461                                         PRINTF("Transfer error transferred: at %ld, MSR=%02X\n",i,c);
 462                                         if(i>6) {
 463                                                 for(ii=0;ii<7;ii++) {
 464                                                         pCMD->result[ii]=bufferw[(i-7+ii)];
 465                                                 } /* for */
 466                                         }
 467                                         if(retriesrw++>FDC_RW_RETRIES) {
 468                                                 if (retriescal++>FDC_CAL_RETRIES) {
 469                                                         stop_fdc_drive(pCMD);
 470                                                         if (flags)
 471                                                                 enable_interrupts();
 472                                                         return false;
 473                                                 }
 474                                                 else {
 475                                                         PRINTF(" trying to recalibrate Try %d\n",retriescal);
 476                                                         if (fdc_recalibrate(pCMD, pFG) == false) {
 477                                                                 stop_fdc_drive(pCMD);
 478                                                                 if (flags)
 479                                                                         enable_interrupts();
 480                                                                 return false;
 481                                                         }
 482                                                         retriesrw=0;
 483                                                         goto retrycal;
 484                                                 } /* else >FDC_CAL_RETRIES */
 485                                         }
 486                                         else {
 487                                                 PRINTF("Read retry %d\n",retriesrw);
 488                                                 goto retryrw;
 489                                         } /* else >FDC_RW_RETRIES */
 490                                 }/* if output */
 491                                 timeout--;
 492                         } while (true);
 493                 } /* for len */
 494                 /* the last sector of a track or all data has been read,
 495                  * we need to get the results */
 496                 fdc_terminate(pCMD);
 497                 offset+=(sect_size*readblk); /* set up buffer pointer */
 498                 bufferw = &buffer[offset];
 499                 pCMD->blnr+=readblk; /* update current block nr */
 500                 blocks-=readblk; /* update blocks */
 501                 if(blocks==0)
 502                         break; /* we are finish */
 503                 /* setup new read blocks */
 504                 /*      readblk=pFG->head*pFG->sect; */
 505                 readblk=pFG->sect;
 506                 if(readblk>blocks)
 507                         readblk=blocks;
 508 retrycal:
 509                 /* a seek is necessary */
 510                 if (fdc_seek(pCMD, pFG) == false) {
 511                         stop_fdc_drive(pCMD);
 512                         if (flags)
 513                                 enable_interrupts();
 514                         return false;
 515                 }
 516                 if((pCMD->result[STATUS_0]&0x20)!=0x20) {
 517                         PRINTF("Seek error Status: %02X\n",pCMD->result[STATUS_0]);
 518                         stop_fdc_drive(pCMD);
 519                         return false;
 520                 }
 521         } while (true); /* start over */
 522         stop_fdc_drive(pCMD); /* switch off drive */
 523         if (flags)
 524                 enable_interrupts();
 525         return true;
 526 }
 527
 528 /* Scan all drives and check if drive is present and disk is inserted */
 529 int fdc_check_drive(FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
 530 {
 531         int i,drives,state;
 532   /* OK procedure of data book is satisfied.
 533          * trying to get some information over the drives */
 534         state=0; /* no drives, no disks */
 535         for(drives=0;drives<4;drives++) {
 536                 pCMD->drive=drives;
 537                 select_fdc_drive(pCMD);
 538                 pCMD->blnr=0; /* set to the 1st block */
 539                 if (fdc_recalibrate(pCMD, pFG) == false)
 540                         continue;
 541                 if((pCMD->result[STATUS_0]&0x10)==0x10)
 542                         continue;
 543                 /* ok drive connected check for disk */
 544                 state|=(1<<drives);
 545                 pCMD->blnr=pFG->size; /* set to the last block */
 546                 if (fdc_seek(pCMD, pFG) == false)
 547                         continue;
 548                 pCMD->blnr=0; /* set to the 1st block */
 549                 if (fdc_recalibrate(pCMD, pFG) == false)
 550                         continue;
 551                 pCMD->cmd[COMMAND]=FDC_CMD_READ_ID;
 552                 if (fdc_issue_cmd(pCMD, pFG) == false)
 553                         continue;
 554                 state|=(0x10<<drives);
 555         }
 556         stop_fdc_drive(pCMD);
 557         for(i=0;i<4;i++) {
 558                 PRINTF("Floppy Drive %d %sconnected %sDisk inserted %s\n",i,
 559                         ((state&(1<<i))==(1<<i)) ? "":"not ",
 560                         ((state&(0x10<<i))==(0x10<<i)) ? "":"no ",
 561                         ((state&(0x10<<i))==(0x10<<i)) ? pFG->name : "");
 562         }
 563         pCMD->flags=state;
 564         return true;
 565 }
 566
 567
 568 /**************************************************************************
 569 * int fdc_setup
 570 * setup the fdc according the datasheet
 571 * assuming in PS2 Mode
 572 */
 573 int fdc_setup(int drive, FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
 574 {
 575         int i;
 576
 577 #ifdef CONFIG_SYS_FDC_HW_INIT
 578         fdc_hw_init ();
 579 #endif
 580         /* first, we reset the FDC via the DOR */
 581         write_fdc_reg(FDC_DOR,0x00);
 582         for(i=0; i<255; i++) /* then we wait some time */
 583                 udelay(500);
 584         /* then, we clear the reset in the DOR */
 585         pCMD->drive=drive;
 586         select_fdc_drive(pCMD);
 587         /* initialize the CCR */
 588         write_fdc_reg(FDC_CCR,pFG->rate);
 589         /* then initialize the DSR */
 590         write_fdc_reg(FDC_DSR,pFG->rate);
 591         if (wait_for_fdc_int() == false) {
 592                         PRINTF("Time Out after writing CCR\n");
 593                         return false;
 594         }
 595         /* now issue sense Interrupt and status command
 596          * assuming only one drive present (drive 0) */
 597         pCMD->dma=0; /* we don't use any dma at all */
 598         for(i=0;i<4;i++) {
 599                 /* issue sense interrupt for all 4 possible drives */
 600                 pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
 601                 if (fdc_issue_cmd(pCMD, pFG) == false) {
 602                         PRINTF("Sense Interrupt for drive %d failed\n",i);
 603                 }
 604         }
 605         /* issue the configure command */
 606         pCMD->drive=drive;
 607         select_fdc_drive(pCMD);
 608         pCMD->cmd[COMMAND]=FDC_CMD_CONFIGURE;
 609         if (fdc_issue_cmd(pCMD, pFG) == false) {
 610                 PRINTF(" configure timeout\n");
 611                 stop_fdc_drive(pCMD);
 612                 return false;
 613         }
 614         /* issue specify command */
 615         pCMD->cmd[COMMAND]=FDC_CMD_SPECIFY;
 616         if (fdc_issue_cmd(pCMD, pFG) == false) {
 617                 PRINTF(" specify timeout\n");
 618                 stop_fdc_drive(pCMD);
 619                 return false;
 620
 621         }
 622         /* then, we clear the reset in the DOR */
 623         /* fdc_check_drive(pCMD,pFG);   */
 624         /*      write_fdc_reg(FDC_DOR,0x04); */
 625
 626         return true;
 627 }
 628
 629 /****************************************************************************
 630  * main routine do_fdcboot
 631  */
 632 int do_fdcboot (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 633 {
 634         FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
 635         FDC_COMMAND_STRUCT *pCMD = &cmd;
 636         unsigned long addr,imsize;
 637 #if defined(CONFIG_LEGACY_IMAGE_FORMAT)
 638         image_header_t *hdr;  /* used for fdc boot */
 639 #endif
 640         unsigned char boot_drive;
 641         int i,nrofblk;
 642 #if defined(CONFIG_FIT)
 643         const void *fit_hdr = NULL;
 644 #endif
 645
 646         switch (argc) {
 647         case 1:
 648                 addr = CONFIG_SYS_LOAD_ADDR;
 649                 boot_drive=CONFIG_SYS_FDC_DRIVE_NUMBER;
 650                 break;
 651         case 2:
 652                 addr = simple_strtoul(argv[1], NULL, 16);
 653                 boot_drive=CONFIG_SYS_FDC_DRIVE_NUMBER;
 654                 break;
 655         case 3:
 656                 addr = simple_strtoul(argv[1], NULL, 16);
 657                 boot_drive=simple_strtoul(argv[2], NULL, 10);
 658                 break;
 659         default:
 660                 return CMD_RET_USAGE;
 661         }
 662         /* setup FDC and scan for drives  */
 663         if (fdc_setup(boot_drive, pCMD, pFG) == false) {
 664                 printf("\n** Error in setup FDC **\n");
 665                 return 1;
 666         }
 667         if (fdc_check_drive(pCMD, pFG) == false) {
 668                 printf("\n** Error in check_drives **\n");
 669                 return 1;
 670         }
 671         if((pCMD->flags&(1<<boot_drive))==0) {
 672                 /* drive not available */
 673                 printf("\n** Drive %d not availabe **\n",boot_drive);
 674                 return 1;
 675         }
 676         if((pCMD->flags&(0x10<<boot_drive))==0) {
 677                 /* no disk inserted */
 678                 printf("\n** No disk inserted in drive %d **\n",boot_drive);
 679                 return 1;
 680         }
 681         /* ok, we have a valid source */
 682         pCMD->drive=boot_drive;
 683         /* read first block */
 684         pCMD->blnr=0;
 685         if (fdc_read_data((unsigned char *)addr, 1, pCMD, pFG) == false) {
 686                 printf("\nRead error:");
 687                 for(i=0;i<7;i++)
 688                         printf("result%d: 0x%02X\n",i,pCMD->result[i]);
 689                 return 1;
 690         }
 691
 692         switch (genimg_get_format ((void *)addr)) {
 693 #if defined(CONFIG_LEGACY_IMAGE_FORMAT)
 694         case IMAGE_FORMAT_LEGACY:
 695                 hdr = (image_header_t *)addr;
 696                 image_print_contents (hdr);
 697
 698                 imsize = image_get_image_size (hdr);
 699                 break;
 700 #endif
 701 #if defined(CONFIG_FIT)
 702         case IMAGE_FORMAT_FIT:
 703                 fit_hdr = (const void *)addr;
 704                 puts ("Fit image detected...\n");
 705
 706                 imsize = fit_get_size (fit_hdr);
 707                 break;
 708 #endif
 709         default:
 710                 puts ("** Unknown image type\n");
 711                 return 1;
 712         }
 713
 714         nrofblk=imsize/512;
 715         if((imsize%512)>0)
 716                 nrofblk++;
 717         printf("Loading %ld Bytes (%d blocks) at 0x%08lx..\n",imsize,nrofblk,addr);
 718         pCMD->blnr=0;
 719         if (fdc_read_data((unsigned char *)addr, nrofblk, pCMD, pFG) == false) {
 720                 /* read image block */
 721                 printf("\nRead error:");
 722                 for(i=0;i<7;i++)
 723                         printf("result%d: 0x%02X\n",i,pCMD->result[i]);
 724                 return 1;
 725         }
 726         printf("OK %ld Bytes loaded.\n",imsize);
 727
 728         flush_cache (addr, imsize);
 729
 730 #if defined(CONFIG_FIT)
 731         /* This cannot be done earlier, we need complete FIT image in RAM first */
 732         if (genimg_get_format ((void *)addr) == IMAGE_FORMAT_FIT) {
 733                 if (!fit_check_format (fit_hdr)) {
 734                         puts ("** Bad FIT image format\n");
 735                         return 1;
 736                 }
 737                 fit_print_contents (fit_hdr);
 738         }
 739 #endif
 740
 741         /* Loading ok, update default load address */
 742         load_addr = addr;
 743
 744         return bootm_maybe_autostart(cmdtp, argv[0]);
 745 }
 746
 747 U_BOOT_CMD(
 748         fdcboot,        3,      1,      do_fdcboot,
 749         "boot from floppy device",
 750         "loadAddr drive"
 751 );