common/cmd_fdc.c

   1 /*
   2  * (C) Copyright 2001
   3  * Denis Peter, MPL AG, d.peter@mpl.ch.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  *
  23  */
  24 /*
  25  * Floppy Disk support
  26  */
  27
  28 #include <common.h>
  29 #include <config.h>
  30 #include <command.h>
  31 #include <image.h>
  32
  33
  34 #undef  FDC_DEBUG
  35
  36 #ifdef  FDC_DEBUG
  37 #define PRINTF(fmt,args...)     printf (fmt ,##args)
  38 #else
  39 #define PRINTF(fmt,args...)
  40 #endif
  41
  42 #ifndef TRUE
  43 #define TRUE            1
  44 #endif
  45 #ifndef FALSE
  46 #define FALSE           0
  47 #endif
  48
  49 /*#if defined(CONFIG_CMD_DATE) */
  50 /*#include <rtc.h> */
  51 /*#endif */
  52
  53 typedef struct {
  54         int             flags;          /* connected drives ect */
  55         unsigned long   blnr;           /* Logical block nr */
  56         uchar           drive;          /* drive no */
  57         uchar           cmdlen;         /* cmd length */
  58         uchar           cmd[16];        /* cmd desc */
  59         uchar           dma;            /* if > 0 dma enabled */
  60         uchar           result[11];     /* status information */
  61         uchar           resultlen;      /* lenght of result */
  62 } FDC_COMMAND_STRUCT;
  63
  64 /* flags: only the lower 8bit used:
  65  * bit 0 if set drive 0 is present
  66  * bit 1 if set drive 1 is present
  67  * bit 2 if set drive 2 is present
  68  * bit 3 if set drive 3 is present
  69  * bit 4 if set disk in drive 0 is inserted
  70  * bit 5 if set disk in drive 1 is inserted
  71  * bit 6 if set disk in drive 2 is inserted
  72  * bit 7 if set disk in drive 4 is inserted
  73  */
  74
  75 /* cmd indexes */
  76 #define COMMAND                 0
  77 #define DRIVE                   1
  78 #define CONFIG0                 1
  79 #define SPEC_HUTSRT             1
  80 #define TRACK                   2
  81 #define CONFIG1                 2
  82 #define SPEC_HLT                2
  83 #define HEAD                    3
  84 #define CONFIG2                 3
  85 #define SECTOR                  4
  86 #define SECTOR_SIZE             5
  87 #define LAST_TRACK              6
  88 #define GAP                     7
  89 #define DTL                     8
  90 /* result indexes */
  91 #define STATUS_0                0
  92 #define STATUS_PCN              1
  93 #define STATUS_1                1
  94 #define STATUS_2                2
  95 #define STATUS_TRACK            3
  96 #define STATUS_HEAD             4
  97 #define STATUS_SECT             5
  98 #define STATUS_SECT_SIZE        6
  99
 100
 101 /* Register addresses */
 102 #define FDC_BASE        0x3F0
 103 #define FDC_SRA         FDC_BASE + 0    /* Status Register A */
 104 #define FDC_SRB         FDC_BASE + 1    /* Status Register B */
 105 #define FDC_DOR         FDC_BASE + 2    /* Digital Output Register */
 106 #define FDC_TDR         FDC_BASE + 3    /* Tape Drive Register */
 107 #define FDC_DSR         FDC_BASE + 4    /* Data rate Register */
 108 #define FDC_MSR         FDC_BASE + 4    /* Main Status Register */
 109 #define FDC_FIFO        FDC_BASE + 5    /* FIFO */
 110 #define FDC_DIR         FDC_BASE + 6    /* Digital Input Register */
 111 #define FDC_CCR         FDC_BASE + 7    /* Configuration Control */
 112 /* Commands */
 113 #define FDC_CMD_SENSE_INT       0x08
 114 #define FDC_CMD_CONFIGURE       0x13
 115 #define FDC_CMD_SPECIFY         0x03
 116 #define FDC_CMD_RECALIBRATE     0x07
 117 #define FDC_CMD_READ            0x06
 118 #define FDC_CMD_READ_TRACK      0x02
 119 #define FDC_CMD_READ_ID         0x0A
 120 #define FDC_CMD_DUMP_REG        0x0E
 121 #define FDC_CMD_SEEK            0x0F
 122
 123 #define FDC_CMD_SENSE_INT_LEN   0x01
 124 #define FDC_CMD_CONFIGURE_LEN   0x04
 125 #define FDC_CMD_SPECIFY_LEN     0x03
 126 #define FDC_CMD_RECALIBRATE_LEN 0x02
 127 #define FDC_CMD_READ_LEN        0x09
 128 #define FDC_CMD_READ_TRACK_LEN  0x09
 129 #define FDC_CMD_READ_ID_LEN     0x02
 130 #define FDC_CMD_DUMP_REG_LEN    0x01
 131 #define FDC_CMD_SEEK_LEN        0x03
 132
 133 #define FDC_FIFO_THR            0x0C
 134 #define FDC_FIFO_DIS            0x00
 135 #define FDC_IMPLIED_SEEK        0x01
 136 #define FDC_POLL_DIS            0x00
 137 #define FDC_PRE_TRK             0x00
 138 #define FDC_CONFIGURE           FDC_FIFO_THR | (FDC_POLL_DIS<<4) | (FDC_FIFO_DIS<<5) | (FDC_IMPLIED_SEEK << 6)
 139 #define FDC_MFM_MODE            0x01 /* MFM enable */
 140 #define FDC_SKIP_MODE           0x00 /* skip enable */
 141
 142 #define FDC_TIME_OUT 100000 /* time out */
 143 #define FDC_RW_RETRIES          3 /* read write retries */
 144 #define FDC_CAL_RETRIES         3 /* calibration and seek retries */
 145
 146
 147 /* Disk structure */
 148 typedef struct  {
 149         unsigned int size;      /* nr of sectors total */
 150         unsigned int sect;      /* sectors per track */
 151         unsigned int head;      /* nr of heads */
 152         unsigned int track;     /* nr of tracks */
 153         unsigned int stretch;   /* !=0 means double track steps */
 154         unsigned char   gap;    /* gap1 size */
 155         unsigned char   rate;   /* data rate. |= 0x40 for perpendicular */
 156         unsigned char   spec1;  /* stepping rate, head unload time */
 157         unsigned char   fmt_gap;/* gap2 size */
 158         unsigned char hlt;      /* head load time */
 159         unsigned char sect_code;/* Sector Size code */
 160         const char      * name; /* used only for predefined formats */
 161 } FD_GEO_STRUCT;
 162
 163
 164 /* supported Floppy types (currently only one) */
 165 const static FD_GEO_STRUCT floppy_type[2] = {
 166         { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,16,2,"H1440" },    /*  7 1.44MB 3.5"   */
 167         {    0, 0,0, 0,0,0x00,0x00,0x00,0x00, 0,0,NULL    },    /*  end of table    */
 168 };
 169
 170 static FDC_COMMAND_STRUCT cmd; /* global command struct */
 171
 172 /* If the boot drive number is undefined, we assume it's drive 0             */
 173 #ifndef CONFIG_SYS_FDC_DRIVE_NUMBER
 174 #define CONFIG_SYS_FDC_DRIVE_NUMBER 0
 175 #endif
 176
 177 /* Hardware access */
 178 #ifndef CONFIG_SYS_ISA_IO_STRIDE
 179 #define CONFIG_SYS_ISA_IO_STRIDE 1
 180 #endif
 181
 182 #ifndef CONFIG_SYS_ISA_IO_OFFSET
 183 #define CONFIG_SYS_ISA_IO_OFFSET 0
 184 #endif
 185
 186 /* Supporting Functions */
 187 /* reads a Register of the FDC */
 188 unsigned char read_fdc_reg(unsigned int addr)
 189 {
 190         volatile unsigned char *val =
 191                 (volatile unsigned char *)(CONFIG_SYS_ISA_IO_BASE_ADDRESS +
 192                                            (addr * CONFIG_SYS_ISA_IO_STRIDE) +
 193                                            CONFIG_SYS_ISA_IO_OFFSET);
 194
 195         return val [0];
 196 }
 197
 198 /* writes a Register of the FDC */
 199 void write_fdc_reg(unsigned int addr, unsigned char val)
 200 {
 201         volatile unsigned char *tmp =
 202                 (volatile unsigned char *)(CONFIG_SYS_ISA_IO_BASE_ADDRESS +
 203                                            (addr * CONFIG_SYS_ISA_IO_STRIDE) +
 204                                            CONFIG_SYS_ISA_IO_OFFSET);
 205         tmp[0]=val;
 206 }
 207
 208 /* waits for an interrupt (polling) */
 209 int wait_for_fdc_int(void)
 210 {
 211         unsigned long timeout;
 212         timeout = FDC_TIME_OUT;
 213         while((read_fdc_reg(FDC_SRA)&0x80)==0) {
 214                 timeout--;
 215                 udelay(10);
 216                 if(timeout==0) /* timeout occured */
 217                         return FALSE;
 218         }
 219         return TRUE;
 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",
 283                 pCMD->cmd[0],track,head,sect,pCMD->drive,pCMD->blnr);
 284
 285         if(head|=0) { /* max heads = 2 */
 286                 pCMD->cmd[DRIVE]=pCMD->drive | 0x04; /* head 1 */
 287                 pCMD->cmd[HEAD]=(unsigned char) head; /* head register */
 288         }
 289         else {
 290                 pCMD->cmd[DRIVE]=pCMD->drive; /* head 0 */
 291                 pCMD->cmd[HEAD]=(unsigned char) head; /* head register */
 292         }
 293         pCMD->cmd[TRACK]=(unsigned char) track; /* track */
 294         switch (pCMD->cmd[COMMAND]) {
 295                 case FDC_CMD_READ:
 296                         pCMD->cmd[SECTOR]=(unsigned char) sect; /* sector */
 297                         pCMD->cmd[SECTOR_SIZE]=pFG->sect_code; /* sector size code */
 298                         pCMD->cmd[LAST_TRACK]=pFG->sect; /* End of track */
 299                         pCMD->cmd[GAP]=pFG->gap; /* gap */
 300                         pCMD->cmd[DTL]=0xFF; /* DTL */
 301                         pCMD->cmdlen=FDC_CMD_READ_LEN;
 302                         pCMD->cmd[COMMAND]|=(FDC_MFM_MODE<<6); /* set MFM bit */
 303                         pCMD->cmd[COMMAND]|=(FDC_SKIP_MODE<<5); /* set Skip bit */
 304                         pCMD->resultlen=0;  /* result only after execution */
 305                         break;
 306                 case FDC_CMD_SEEK:
 307                         pCMD->cmdlen=FDC_CMD_SEEK_LEN;
 308                         pCMD->resultlen=0;  /* no result */
 309                         break;
 310                 case FDC_CMD_CONFIGURE:
 311                         pCMD->cmd[CONFIG0]=0;
 312                         pCMD->cmd[CONFIG1]=FDC_CONFIGURE; /* FIFO Threshold, Poll, Enable FIFO */
 313                         pCMD->cmd[CONFIG2]=FDC_PRE_TRK; /* Precompensation Track */
 314                         pCMD->cmdlen=FDC_CMD_CONFIGURE_LEN;
 315                         pCMD->resultlen=0;  /* no result */
 316                         break;
 317                 case FDC_CMD_SPECIFY:
 318                         pCMD->cmd[SPEC_HUTSRT]=pFG->spec1;
 319                         pCMD->cmd[SPEC_HLT]=(pFG->hlt)<<1; /* head load time */
 320                         if(pCMD->dma==0)
 321                                 pCMD->cmd[SPEC_HLT]|=0x1; /* no dma */
 322                         pCMD->cmdlen=FDC_CMD_SPECIFY_LEN;
 323                         pCMD->resultlen=0;  /* no result */
 324                         break;
 325                 case FDC_CMD_DUMP_REG:
 326                         pCMD->cmdlen=FDC_CMD_DUMP_REG_LEN;
 327                         pCMD->resultlen=10;  /* 10 byte result */
 328                         break;
 329                 case FDC_CMD_READ_ID:
 330                         pCMD->cmd[COMMAND]|=(FDC_MFM_MODE<<6); /* set MFM bit */
 331                         pCMD->cmdlen=FDC_CMD_READ_ID_LEN;
 332                         pCMD->resultlen=7;  /* 7 byte result */
 333                         break;
 334                 case FDC_CMD_RECALIBRATE:
 335                         pCMD->cmd[DRIVE]&=0x03; /* don't set the head bit */
 336                         pCMD->cmdlen=FDC_CMD_RECALIBRATE_LEN;
 337                         pCMD->resultlen=0;  /* no result */
 338                         break;
 339                         break;
 340                 case FDC_CMD_SENSE_INT:
 341                         pCMD->cmdlen=FDC_CMD_SENSE_INT_LEN;
 342                         pCMD->resultlen=2;
 343                         break;
 344         }
 345         for(i=0;i<pCMD->cmdlen;i++) {
 346                 /* PRINTF("write cmd%d = 0x%02X\n",i,pCMD->cmd[i]); */
 347                 if(write_fdc_byte(pCMD->cmd[i])==FALSE) {
 348                         PRINTF("Error: timeout while issue cmd%d\n",i);
 349                         return FALSE;
 350                 }
 351         }
 352         timeout=FDC_TIME_OUT;
 353         for(i=0;i<pCMD->resultlen;i++) {
 354                 while((read_fdc_reg(FDC_MSR)&0xC0)!=0xC0) {
 355                         timeout--;
 356                         if(timeout==0) {
 357                                 PRINTF(" timeout while reading result%d MSR=0x%02X\n",i,read_fdc_reg(FDC_MSR));
 358                                 return FALSE;
 359                         }
 360                 }
 361                 pCMD->result[i]=(unsigned char)read_fdc_byte();
 362         }
 363         return TRUE;
 364 }
 365
 366 /* selects the drive assigned in the cmd structur and
 367    switches on the Motor */
 368 void select_fdc_drive(FDC_COMMAND_STRUCT *pCMD)
 369 {
 370         unsigned char val;
 371
 372         val=(1<<(4+pCMD->drive))|pCMD->drive|0xC; /* set reset, dma gate and motor bits */
 373         if((read_fdc_reg(FDC_DOR)&val)!=val) {
 374                 write_fdc_reg(FDC_DOR,val);
 375                 for(val=0;val<255;val++)
 376                         udelay(500); /* wait some time to start motor */
 377         }
 378 }
 379
 380 /* switches off the Motor of the specified drive */
 381 void stop_fdc_drive(FDC_COMMAND_STRUCT *pCMD)
 382 {
 383         unsigned char val;
 384
 385         val=(1<<(4+pCMD->drive))|pCMD->drive; /* sets motor bits */
 386         write_fdc_reg(FDC_DOR,(read_fdc_reg(FDC_DOR)&~val));
 387 }
 388
 389 /* issues a recalibrate command, waits for interrupt and
 390  * issues a sense_interrupt */
 391 int fdc_recalibrate(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
 392 {
 393         pCMD->cmd[COMMAND]=FDC_CMD_RECALIBRATE;
 394         if(fdc_issue_cmd(pCMD,pFG)==FALSE)
 395                 return FALSE;
 396         while(wait_for_fdc_int()!=TRUE);
 397         pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
 398         return(fdc_issue_cmd(pCMD,pFG));
 399 }
 400
 401 /* issues a recalibrate command, waits for interrupt and
 402  * issues a sense_interrupt */
 403 int fdc_seek(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
 404 {
 405         pCMD->cmd[COMMAND]=FDC_CMD_SEEK;
 406         if(fdc_issue_cmd(pCMD,pFG)==FALSE)
 407                 return FALSE;
 408         while(wait_for_fdc_int()!=TRUE);
 409         pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
 410         return(fdc_issue_cmd(pCMD,pFG));
 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,readblk,i,timeout,ii,offset;
 432         unsigned char 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                 if (flags)
 446                         enable_interrupts();
 447                 return FALSE;
 448         }
 449         if((pCMD->result[STATUS_0]&0x20)!=0x20) {
 450                 printf("Seek error Status: %02X\n",pCMD->result[STATUS_0]);
 451                 stop_fdc_drive(pCMD);
 452                 if (flags)
 453                         enable_interrupts();
 454                 return FALSE;
 455         }
 456         /* now determine the next seek point */
 457         /*      lastblk=pCMD->blnr + blocks; */
 458         /*      readblk=(pFG->head*pFG->sect)-(pCMD->blnr%(pFG->head*pFG->sect)); */
 459         readblk=pFG->sect-(pCMD->blnr%pFG->sect);
 460         PRINTF("1st nr of block possible read %ld start %ld\n",readblk,pCMD->blnr);
 461         if(readblk>blocks) /* is end within 1st track */
 462                 readblk=blocks; /* yes, correct it */
 463         PRINTF("we read %ld blocks start %ld\n",readblk,pCMD->blnr);
 464         bufferw = &buffer[0]; /* setup working buffer */
 465         do {
 466 retryrw:
 467                 len=sect_size * readblk;
 468                 pCMD->cmd[COMMAND]=FDC_CMD_READ;
 469                 if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
 470                         stop_fdc_drive(pCMD);
 471                         if (flags)
 472                                 enable_interrupts();
 473                         return FALSE;
 474                 }
 475                 for (i=0;i<len;i++) {
 476                         timeout=FDC_TIME_OUT;
 477                         do {
 478                                 c=read_fdc_reg(FDC_MSR);
 479                                 if((c&0xC0)==0xC0) {
 480                                         bufferw[i]=read_fdc_reg(FDC_FIFO);
 481                                         break;
 482                                 }
 483                                 if((c&0xC0)==0x80) { /* output */
 484                                         PRINTF("Transfer error transfered: at %ld, MSR=%02X\n",i,c);
 485                                         if(i>6) {
 486                                                 for(ii=0;ii<7;ii++) {
 487                                                         pCMD->result[ii]=bufferw[(i-7+ii)];
 488                                                 } /* for */
 489                                         }
 490                                         if(retriesrw++>FDC_RW_RETRIES) {
 491                                                 if (retriescal++>FDC_CAL_RETRIES) {
 492                                                         stop_fdc_drive(pCMD);
 493                                                         if (flags)
 494                                                                 enable_interrupts();
 495                                                         return FALSE;
 496                                                 }
 497                                                 else {
 498                                                         PRINTF(" trying to recalibrate Try %d\n",retriescal);
 499                                                         if(fdc_recalibrate(pCMD,pFG)==FALSE) {
 500                                                                 stop_fdc_drive(pCMD);
 501                                                                 if (flags)
 502                                                                         enable_interrupts();
 503                                                                 return FALSE;
 504                                                         }
 505                                                         retriesrw=0;
 506                                                         goto retrycal;
 507                                                 } /* else >FDC_CAL_RETRIES */
 508                                         }
 509                                         else {
 510                                                 PRINTF("Read retry %d\n",retriesrw);
 511                                                 goto retryrw;
 512                                         } /* else >FDC_RW_RETRIES */
 513                                 }/* if output */
 514                                 timeout--;
 515                         }while(TRUE);
 516                 } /* for len */
 517                 /* the last sector of a track or all data has been read,
 518                  * we need to get the results */
 519                 fdc_terminate(pCMD);
 520                 offset+=(sect_size*readblk); /* set up buffer pointer */
 521                 bufferw = &buffer[offset];
 522                 pCMD->blnr+=readblk; /* update current block nr */
 523                 blocks-=readblk; /* update blocks */
 524                 if(blocks==0)
 525                         break; /* we are finish */
 526                 /* setup new read blocks */
 527                 /*      readblk=pFG->head*pFG->sect; */
 528                 readblk=pFG->sect;
 529                 if(readblk>blocks)
 530                         readblk=blocks;
 531 retrycal:
 532                 /* a seek is necessary */
 533                 if(fdc_seek(pCMD,pFG)==FALSE) {
 534                         stop_fdc_drive(pCMD);
 535                         if (flags)
 536                                 enable_interrupts();
 537                         return FALSE;
 538                 }
 539                 if((pCMD->result[STATUS_0]&0x20)!=0x20) {
 540                         PRINTF("Seek error Status: %02X\n",pCMD->result[STATUS_0]);
 541                         stop_fdc_drive(pCMD);
 542                         return FALSE;
 543                 }
 544         }while(TRUE); /* start over */
 545         stop_fdc_drive(pCMD); /* switch off drive */
 546         if (flags)
 547                 enable_interrupts();
 548         return TRUE;
 549 }
 550
 551 /* Scan all drives and check if drive is present and disk is inserted */
 552 int fdc_check_drive(FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
 553 {
 554         int i,drives,state;
 555   /* OK procedure of data book is satisfied.
 556          * trying to get some information over the drives */
 557         state=0; /* no drives, no disks */
 558         for(drives=0;drives<4;drives++) {
 559                 pCMD->drive=drives;
 560                 select_fdc_drive(pCMD);
 561                 pCMD->blnr=0; /* set to the 1st block */
 562                 if(fdc_recalibrate(pCMD,pFG)==FALSE)
 563                         continue;
 564                 if((pCMD->result[STATUS_0]&0x10)==0x10)
 565                         continue;
 566                 /* ok drive connected check for disk */
 567                 state|=(1<<drives);
 568                 pCMD->blnr=pFG->size; /* set to the last block */
 569                 if(fdc_seek(pCMD,pFG)==FALSE)
 570                         continue;
 571                 pCMD->blnr=0; /* set to the 1st block */
 572                 if(fdc_recalibrate(pCMD,pFG)==FALSE)
 573                         continue;
 574                 pCMD->cmd[COMMAND]=FDC_CMD_READ_ID;
 575                 if(fdc_issue_cmd(pCMD,pFG)==FALSE)
 576                         continue;
 577                 state|=(0x10<<drives);
 578         }
 579         stop_fdc_drive(pCMD);
 580         for(i=0;i<4;i++) {
 581                 PRINTF("Floppy Drive %d %sconnected %sDisk inserted %s\n",i,
 582                         ((state&(1<<i))==(1<<i)) ? "":"not ",
 583                         ((state&(0x10<<i))==(0x10<<i)) ? "":"no ",
 584                         ((state&(0x10<<i))==(0x10<<i)) ? pFG->name : "");
 585         }
 586         pCMD->flags=state;
 587         return TRUE;
 588 }
 589
 590
 591 /**************************************************************************
 592 * int fdc_setup
 593 * setup the fdc according the datasheet
 594 * assuming in PS2 Mode
 595 */
 596 int fdc_setup(int drive, FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
 597 {
 598         int i;
 599
 600 #ifdef CONFIG_SYS_FDC_HW_INIT
 601         fdc_hw_init ();
 602 #endif
 603         /* first, we reset the FDC via the DOR */
 604         write_fdc_reg(FDC_DOR,0x00);
 605         for(i=0; i<255; i++) /* then we wait some time */
 606                 udelay(500);
 607         /* then, we clear the reset in the DOR */
 608         pCMD->drive=drive;
 609         select_fdc_drive(pCMD);
 610         /* initialize the CCR */
 611         write_fdc_reg(FDC_CCR,pFG->rate);
 612         /* then initialize the DSR */
 613         write_fdc_reg(FDC_DSR,pFG->rate);
 614         if(wait_for_fdc_int()==FALSE) {
 615                         PRINTF("Time Out after writing CCR\n");
 616                         return FALSE;
 617         }
 618         /* now issue sense Interrupt and status command
 619          * assuming only one drive present (drive 0) */
 620         pCMD->dma=0; /* we don't use any dma at all */
 621         for(i=0;i<4;i++) {
 622                 /* issue sense interrupt for all 4 possible drives */
 623                 pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
 624                 if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
 625                         PRINTF("Sense Interrupt for drive %d failed\n",i);
 626                 }
 627         }
 628         /* issue the configure command */
 629         pCMD->drive=drive;
 630         select_fdc_drive(pCMD);
 631         pCMD->cmd[COMMAND]=FDC_CMD_CONFIGURE;
 632         if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
 633                 PRINTF(" configure timeout\n");
 634                 stop_fdc_drive(pCMD);
 635                 return FALSE;
 636         }
 637         /* issue specify command */
 638         pCMD->cmd[COMMAND]=FDC_CMD_SPECIFY;
 639         if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
 640                 PRINTF(" specify timeout\n");
 641                 stop_fdc_drive(pCMD);
 642                 return FALSE;
 643
 644         }
 645         /* then, we clear the reset in the DOR */
 646         /* fdc_check_drive(pCMD,pFG);   */
 647         /*      write_fdc_reg(FDC_DOR,0x04); */
 648
 649         return TRUE;
 650 }
 651
 652 #if defined(CONFIG_CMD_FDOS)
 653
 654 /* Low level functions for the Floppy-DOS layer                              */
 655
 656 /**************************************************************************
 657 * int fdc_fdos_init
 658 * initialize the FDC layer
 659 *
 660 */
 661 int fdc_fdos_init (int drive)
 662 {
 663         FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
 664         FDC_COMMAND_STRUCT *pCMD = &cmd;
 665
 666         /* setup FDC and scan for drives  */
 667         if(fdc_setup(drive,pCMD,pFG)==FALSE) {
 668                 printf("\n** Error in setup FDC **\n");
 669                 return FALSE;
 670         }
 671         if(fdc_check_drive(pCMD,pFG)==FALSE) {
 672                 printf("\n** Error in check_drives **\n");
 673                 return FALSE;
 674         }
 675         if((pCMD->flags&(1<<drive))==0) {
 676                 /* drive not available */
 677                 printf("\n** Drive %d not available **\n",drive);
 678                 return FALSE;
 679         }
 680         if((pCMD->flags&(0x10<<drive))==0) {
 681                 /* no disk inserted */
 682                 printf("\n** No disk inserted in drive %d **\n",drive);
 683                 return FALSE;
 684         }
 685         /* ok, we have a valid source */
 686         pCMD->drive=drive;
 687
 688         /* read first block */
 689         pCMD->blnr=0;
 690         return TRUE;
 691 }
 692 /**************************************************************************
 693 * int fdc_fdos_seek
 694 * parameter is a block number
 695 */
 696 int fdc_fdos_seek (int where)
 697 {
 698         FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
 699         FDC_COMMAND_STRUCT *pCMD = &cmd;
 700
 701         pCMD -> blnr = where ;
 702         return (fdc_seek (pCMD, pFG));
 703 }
 704 /**************************************************************************
 705 * int fdc_fdos_read
 706 *  the length is in block number
 707 */
 708 int fdc_fdos_read (void *buffer, int len)
 709 {
 710         FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
 711         FDC_COMMAND_STRUCT *pCMD = &cmd;
 712
 713         return (fdc_read_data (buffer, len, pCMD, pFG));
 714 }
 715 #endif
 716
 717 #if defined(CONFIG_CMD_FDC)
 718 /****************************************************************************
 719  * main routine do_fdcboot
 720  */
 721 int do_fdcboot (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 722 {
 723         FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
 724         FDC_COMMAND_STRUCT *pCMD = &cmd;
 725         unsigned long addr,imsize;
 726         image_header_t *hdr;  /* used for fdc boot */
 727         unsigned char boot_drive;
 728         int i,nrofblk;
 729 #if defined(CONFIG_FIT)
 730         const void *fit_hdr = NULL;
 731 #endif
 732
 733         switch (argc) {
 734         case 1:
 735                 addr = CONFIG_SYS_LOAD_ADDR;
 736                 boot_drive=CONFIG_SYS_FDC_DRIVE_NUMBER;
 737                 break;
 738         case 2:
 739                 addr = simple_strtoul(argv[1], NULL, 16);
 740                 boot_drive=CONFIG_SYS_FDC_DRIVE_NUMBER;
 741                 break;
 742         case 3:
 743                 addr = simple_strtoul(argv[1], NULL, 16);
 744                 boot_drive=simple_strtoul(argv[2], NULL, 10);
 745                 break;
 746         default:
 747                 return CMD_RET_USAGE;
 748         }
 749         /* setup FDC and scan for drives  */
 750         if(fdc_setup(boot_drive,pCMD,pFG)==FALSE) {
 751                 printf("\n** Error in setup FDC **\n");
 752                 return 1;
 753         }
 754         if(fdc_check_drive(pCMD,pFG)==FALSE) {
 755                 printf("\n** Error in check_drives **\n");
 756                 return 1;
 757         }
 758         if((pCMD->flags&(1<<boot_drive))==0) {
 759                 /* drive not available */
 760                 printf("\n** Drive %d not availabe **\n",boot_drive);
 761                 return 1;
 762         }
 763         if((pCMD->flags&(0x10<<boot_drive))==0) {
 764                 /* no disk inserted */
 765                 printf("\n** No disk inserted in drive %d **\n",boot_drive);
 766                 return 1;
 767         }
 768         /* ok, we have a valid source */
 769         pCMD->drive=boot_drive;
 770         /* read first block */
 771         pCMD->blnr=0;
 772         if(fdc_read_data((unsigned char *)addr,1,pCMD,pFG)==FALSE) {
 773                 printf("\nRead error:");
 774                 for(i=0;i<7;i++)
 775                         printf("result%d: 0x%02X\n",i,pCMD->result[i]);
 776                 return 1;
 777         }
 778
 779         switch (genimg_get_format ((void *)addr)) {
 780         case IMAGE_FORMAT_LEGACY:
 781                 hdr = (image_header_t *)addr;
 782                 image_print_contents (hdr);
 783
 784                 imsize = image_get_image_size (hdr);
 785                 break;
 786 #if defined(CONFIG_FIT)
 787         case IMAGE_FORMAT_FIT:
 788                 fit_hdr = (const void *)addr;
 789                 puts ("Fit image detected...\n");
 790
 791                 imsize = fit_get_size (fit_hdr);
 792                 break;
 793 #endif
 794         default:
 795                 puts ("** Unknown image type\n");
 796                 return 1;
 797         }
 798
 799         nrofblk=imsize/512;
 800         if((imsize%512)>0)
 801                 nrofblk++;
 802         printf("Loading %ld Bytes (%d blocks) at 0x%08lx..\n",imsize,nrofblk,addr);
 803         pCMD->blnr=0;
 804         if(fdc_read_data((unsigned char *)addr,nrofblk,pCMD,pFG)==FALSE) {
 805                 /* read image block */
 806                 printf("\nRead error:");
 807                 for(i=0;i<7;i++)
 808                         printf("result%d: 0x%02X\n",i,pCMD->result[i]);
 809                 return 1;
 810         }
 811         printf("OK %ld Bytes loaded.\n",imsize);
 812
 813         flush_cache (addr, imsize);
 814
 815 #if defined(CONFIG_FIT)
 816         /* This cannot be done earlier, we need complete FIT image in RAM first */
 817         if (genimg_get_format ((void *)addr) == IMAGE_FORMAT_FIT) {
 818                 if (!fit_check_format (fit_hdr)) {
 819                         puts ("** Bad FIT image format\n");
 820                         return 1;
 821                 }
 822                 fit_print_contents (fit_hdr);
 823         }
 824 #endif
 825
 826         /* Loading ok, update default load address */
 827         load_addr = addr;
 828
 829         return bootm_maybe_autostart(cmdtp, argv[0]);
 830 }
 831
 832 U_BOOT_CMD(
 833         fdcboot,        3,      1,      do_fdcboot,
 834         "boot from floppy device",
 835         "loadAddr drive"
 836 );
 837 #endif