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 /* Supporting Functions */
 177 /* reads a Register of the FDC */
 178 unsigned char read_fdc_reg(unsigned int addr)
 179 {
 180         volatile unsigned char *val = (volatile unsigned char *)(CFG_ISA_IO_BASE_ADDRESS | addr);
 181         return val[0];
 182 }
 183
 184 /* writes a Register of the FDC */
 185 void write_fdc_reg(unsigned int addr, unsigned char val)
 186 {
 187                 volatile unsigned char *tmp = (volatile unsigned char *)(CFG_ISA_IO_BASE_ADDRESS | addr);
 188                 tmp[0]=val;
 189 }
 190
 191 /* waits for an interrupt (polling) */
 192 int wait_for_fdc_int(void)
 193 {
 194         unsigned long timeout;
 195         timeout = FDC_TIME_OUT;
 196         while((read_fdc_reg(FDC_SRA)&0x80)==0) {
 197                 timeout--;
 198                 udelay(10);
 199                 if(timeout==0) /* timeout occured */
 200                         return FALSE;
 201         }
 202         return TRUE;
 203 }
 204
 205
 206 /* reads a byte from the FIFO of the FDC and checks direction and RQM bit
 207    of the MSR. returns -1 if timeout, or byte if ok */
 208 int read_fdc_byte(void)
 209 {
 210         unsigned long timeout;
 211         timeout = FDC_TIME_OUT;
 212         while((read_fdc_reg(FDC_MSR)&0xC0)!=0xC0) {
 213                 /* direction out and ready */
 214                 udelay(10);
 215                 timeout--;
 216                 if(timeout==0) /* timeout occured */
 217                         return -1;
 218         }
 219         return read_fdc_reg(FDC_FIFO);
 220 }
 221
 222 /* if the direction of the FIFO is wrong, this routine is used to
 223    empty the FIFO. Should _not_ be used */
 224 int fdc_need_more_output(void)
 225 {
 226         unsigned char c;
 227         while((read_fdc_reg(FDC_MSR)&0xC0)==0xC0)       {
 228                         c=(unsigned char)read_fdc_byte();
 229                         printf("Error: more output: %x\n",c);
 230         }
 231         return TRUE;
 232 }
 233
 234
 235 /* writes a byte to the FIFO of the FDC and checks direction and RQM bit
 236    of the MSR */
 237 int write_fdc_byte(unsigned char val)
 238 {
 239         unsigned long timeout;
 240         timeout = FDC_TIME_OUT;
 241         while((read_fdc_reg(FDC_MSR)&0xC0)!=0x80) {
 242                 /* direction in and ready for byte */
 243                 timeout--;
 244                 udelay(10);
 245                 fdc_need_more_output();
 246                 if(timeout==0) /* timeout occured */
 247                         return FALSE;
 248         }
 249         write_fdc_reg(FDC_FIFO,val);
 250         return TRUE;
 251 }
 252
 253 /* sets up all FDC commands and issues it to the FDC. If
 254    the command causes direct results (no Execution Phase)
 255    the result is be read as well. */
 256
 257 int fdc_issue_cmd(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
 258 {
 259         int i;
 260         unsigned long head,track,sect,timeout;
 261         track = pCMD->blnr / (pFG->sect * pFG->head); /* track nr */
 262         sect =  pCMD->blnr % (pFG->sect * pFG->head); /* remaining blocks */
 263         head = sect / pFG->sect; /* head nr */
 264         sect =  sect % pFG->sect; /* remaining blocks */
 265         sect++; /* sectors are 1 based */
 266         PRINTF("Track %ld, Head %ld, Sector %ld, Drive %d (blnr %ld)\n",track,head,sect,pCMD->drive,pCMD->blnr);
 267         if(head|=0) { /* max heads = 2 */
 268                 pCMD->cmd[DRIVE]=pCMD->drive | 0x04; /* head 1 */
 269                 pCMD->cmd[HEAD]=(unsigned char) head; /* head register */
 270         }
 271         else {
 272                 pCMD->cmd[DRIVE]=pCMD->drive; /* head 0 */
 273                 pCMD->cmd[HEAD]=(unsigned char) head; /* head register */
 274         }
 275         pCMD->cmd[TRACK]=(unsigned char) track; /* track */
 276         switch (pCMD->cmd[COMMAND]) {
 277                 case FDC_CMD_READ:
 278                         pCMD->cmd[SECTOR]=(unsigned char) sect; /* sector */
 279                         pCMD->cmd[SECTOR_SIZE]=pFG->sect_code; /* sector size code */
 280                         pCMD->cmd[LAST_TRACK]=pFG->sect; /* End of track */
 281                         pCMD->cmd[GAP]=pFG->gap; /* gap */
 282                         pCMD->cmd[DTL]=0xFF; /* DTL */
 283                         pCMD->cmdlen=FDC_CMD_READ_LEN;
 284                         pCMD->cmd[COMMAND]|=(FDC_MFM_MODE<<6); /* set MFM bit */
 285                         pCMD->cmd[COMMAND]|=(FDC_SKIP_MODE<<5); /* set Skip bit */
 286                         pCMD->resultlen=0;  /* result only after execution */
 287                         break;
 288                 case FDC_CMD_SEEK:
 289                         pCMD->cmdlen=FDC_CMD_SEEK_LEN;
 290                         pCMD->resultlen=0;  /* no result */
 291                         break;
 292                 case FDC_CMD_CONFIGURE:
 293                         pCMD->cmd[CONFIG0]=0;
 294                         pCMD->cmd[CONFIG1]=FDC_CONFIGURE; /* FIFO Threshold, Poll, Enable FIFO */
 295                         pCMD->cmd[CONFIG2]=FDC_PRE_TRK;         /* Precompensation Track */
 296                         pCMD->cmdlen=FDC_CMD_CONFIGURE_LEN;
 297                         pCMD->resultlen=0;  /* no result */
 298                         break;
 299                 case FDC_CMD_SPECIFY:
 300                         pCMD->cmd[SPEC_HUTSRT]=pFG->spec1;
 301                         pCMD->cmd[SPEC_HLT]=(pFG->hlt)<<1; /* head load time */
 302                         if(pCMD->dma==0)
 303                                 pCMD->cmd[SPEC_HLT]|=0x1; /* no dma */
 304                         pCMD->cmdlen=FDC_CMD_SPECIFY_LEN;
 305                         pCMD->resultlen=0;  /* no result */
 306                         break;
 307                 case FDC_CMD_DUMP_REG:
 308                         pCMD->cmdlen=FDC_CMD_DUMP_REG_LEN;
 309                         pCMD->resultlen=10;  /* 10 byte result */
 310                         break;
 311                 case FDC_CMD_READ_ID:
 312                         pCMD->cmd[COMMAND]|=(FDC_MFM_MODE<<6); /* set MFM bit */
 313                         pCMD->cmdlen=FDC_CMD_READ_ID_LEN;
 314                         pCMD->resultlen=7;  /* 7 byte result */
 315                         break;
 316                 case FDC_CMD_RECALIBRATE:
 317                         pCMD->cmd[DRIVE]&=0x03; /* don't set the head bit */
 318                         pCMD->cmdlen=FDC_CMD_RECALIBRATE_LEN;
 319                         pCMD->resultlen=0;  /* no result */
 320                         break;
 321                         break;
 322                 case FDC_CMD_SENSE_INT:
 323                         pCMD->cmdlen=FDC_CMD_SENSE_INT_LEN;
 324                         pCMD->resultlen=2;
 325                         break;
 326         }
 327         for(i=0;i<pCMD->cmdlen;i++) {
 328                 /* PRINTF("write cmd%d = 0x%02X\n",i,pCMD->cmd[i]); */
 329                 if(write_fdc_byte(pCMD->cmd[i])==FALSE) {
 330                         PRINTF("Error: timeout while issue cmd%d\n",i);
 331                         return FALSE;
 332                 }
 333         }
 334         timeout=FDC_TIME_OUT;
 335         for(i=0;i<pCMD->resultlen;i++) {
 336                 while((read_fdc_reg(FDC_MSR)&0xC0)!=0xC0) {
 337                         timeout--;
 338                         if(timeout==0) {
 339                                 PRINTF(" timeout while reading result%d MSR=0x%02X\n",i,read_fdc_reg(FDC_MSR));
 340                                 return FALSE;
 341                         }
 342                 }
 343                 pCMD->result[i]=(unsigned char)read_fdc_byte();
 344         }
 345         return TRUE;
 346 }
 347
 348 /* selects the drive assigned in the cmd structur and
 349    switches on the Motor */
 350 void select_fdc_drive(FDC_COMMAND_STRUCT *pCMD)
 351 {
 352         unsigned char val;
 353
 354         val=(1<<(4+pCMD->drive))|pCMD->drive|0xC; /* set reset, dma gate and motor bits */
 355         if((read_fdc_reg(FDC_DOR)&val)!=val) {
 356                 write_fdc_reg(FDC_DOR,val);
 357                 for(val=0;val<255;val++)
 358                         udelay(500); /* wait some time to start motor */
 359         }
 360 }
 361
 362 /* switches off the Motor of the specified drive */
 363 void stop_fdc_drive(FDC_COMMAND_STRUCT *pCMD)
 364 {
 365         unsigned char val;
 366
 367         val=(1<<(4+pCMD->drive))|pCMD->drive; /* sets motor bits */
 368         write_fdc_reg(FDC_DOR,(read_fdc_reg(FDC_DOR)&~val));
 369 }
 370
 371 /* issues a recalibrate command, waits for interrupt and
 372  * issues a sense_interrupt */
 373 int fdc_recalibrate(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
 374 {
 375         pCMD->cmd[COMMAND]=FDC_CMD_RECALIBRATE;
 376         if(fdc_issue_cmd(pCMD,pFG)==FALSE)
 377                 return FALSE;
 378         while(wait_for_fdc_int()!=TRUE);
 379         pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
 380         return(fdc_issue_cmd(pCMD,pFG));
 381 }
 382
 383 /* issues a recalibrate command, waits for interrupt and
 384  * issues a sense_interrupt */
 385 int fdc_seek(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
 386 {
 387         pCMD->cmd[COMMAND]=FDC_CMD_SEEK;
 388         if(fdc_issue_cmd(pCMD,pFG)==FALSE)
 389                 return FALSE;
 390         while(wait_for_fdc_int()!=TRUE);
 391         pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
 392         return(fdc_issue_cmd(pCMD,pFG));
 393 }
 394
 395
 396 /* terminates current command, by not servicing the FIFO
 397  * waits for interrupt and fills in the result bytes */
 398 int fdc_terminate(FDC_COMMAND_STRUCT *pCMD)
 399 {
 400         int i;
 401         for(i=0;i<100;i++)
 402                 udelay(500); /* wait 500usec for fifo overrun */
 403         while((read_fdc_reg(FDC_SRA)&0x80)==0x00); /* wait as long as no int has occured */
 404         for(i=0;i<7;i++) {
 405                 pCMD->result[i]=(unsigned char)read_fdc_byte();
 406         }
 407         return TRUE;
 408 }
 409
 410 /* reads data from FDC, seek commands are issued automatic */
 411 int fdc_read_data(unsigned char *buffer, unsigned long blocks,FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
 412 {
 413   /* first seek to start address */
 414         unsigned long len,lastblk,readblk,i,timeout,ii,offset;
 415         unsigned char pcn,c,retriesrw,retriescal;
 416         unsigned char *bufferw; /* working buffer */
 417         int sect_size;
 418         int flags;
 419
 420         flags=disable_interrupts(); /* switch off all Interrupts */
 421         select_fdc_drive(pCMD); /* switch on drive */
 422         sect_size=0x080<<pFG->sect_code;
 423         retriesrw=0;
 424         retriescal=0;
 425         offset=0;
 426         if(fdc_seek(pCMD,pFG)==FALSE) {
 427                 stop_fdc_drive(pCMD);
 428                 enable_interrupts();
 429                 return FALSE;
 430         }
 431         if((pCMD->result[STATUS_0]&0x20)!=0x20) {
 432                 printf("Seek error Status: %02X\n",pCMD->result[STATUS_0]);
 433                 stop_fdc_drive(pCMD);
 434                 enable_interrupts();
 435                 return FALSE;
 436         }
 437         pcn=pCMD->result[STATUS_PCN]; /* current track */
 438         /* now determine the next seek point */
 439         lastblk=pCMD->blnr + blocks;
 440         /*      readblk=(pFG->head*pFG->sect)-(pCMD->blnr%(pFG->head*pFG->sect)); */
 441         readblk=pFG->sect-(pCMD->blnr%pFG->sect);
 442         PRINTF("1st nr of block possible read %ld start %ld\n",readblk,pCMD->blnr);
 443         if(readblk>blocks) /* is end within 1st track */
 444                 readblk=blocks; /* yes, correct it */
 445         PRINTF("we read %ld blocks start %ld\n",readblk,pCMD->blnr);
 446         bufferw=&buffer[0]; /* setup working buffer */
 447         do {
 448 retryrw:
 449                 len=sect_size * readblk;
 450                 pCMD->cmd[COMMAND]=FDC_CMD_READ;
 451                 if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
 452                         stop_fdc_drive(pCMD);
 453                         enable_interrupts();
 454                         return FALSE;
 455                 }
 456                 for (i=0;i<len;i++) {
 457                         timeout=FDC_TIME_OUT;
 458                         do {
 459                                 c=read_fdc_reg(FDC_MSR);
 460                                 if((c&0xC0)==0xC0) {
 461                                         bufferw[i]=read_fdc_reg(FDC_FIFO);
 462                                         break;
 463                                 }
 464                                 if((c&0xC0)==0x80) { /* output */
 465                                         PRINTF("Transfer error transfered: at %ld, MSR=%02X\n",i,c);
 466                                         if(i>6) {
 467                                                 for(ii=0;ii<7;ii++) {
 468                                                         pCMD->result[ii]=bufferw[(i-7+ii)];
 469                                                 } /* for */
 470                                         }
 471                                         if(retriesrw++>FDC_RW_RETRIES) {
 472                                                 if (retriescal++>FDC_CAL_RETRIES) {
 473                                                         stop_fdc_drive(pCMD);
 474                                                         enable_interrupts();
 475                                                         return FALSE;
 476                                                 }
 477                                                 else {
 478                                                         PRINTF(" trying to recalibrate Try %d\n",retriescal);
 479                                                         if(fdc_recalibrate(pCMD,pFG)==FALSE) {
 480                                                                 stop_fdc_drive(pCMD);
 481                                                                 enable_interrupts();
 482                                                                 return FALSE;
 483                                                         }
 484                                                         retriesrw=0;
 485                                                         goto retrycal;
 486                                                 } /* else >FDC_CAL_RETRIES */
 487                                         }
 488                                         else {
 489                                                 PRINTF("Read retry %d\n",retriesrw);
 490                                                 goto retryrw;
 491                                         } /* else >FDC_RW_RETRIES */
 492                                 }/* if output */
 493                                 timeout--;
 494                         }while(TRUE);
 495                 } /* for len */
 496                 /* the last sector of a track or all data has been read,
 497                  * we need to get the results */
 498                 fdc_terminate(pCMD);
 499                 offset+=(sect_size*readblk); /* set up buffer pointer */
 500                 bufferw=&buffer[offset];
 501                 pCMD->blnr+=readblk; /* update current block nr */
 502                 blocks-=readblk; /* update blocks */
 503                 if(blocks==0)
 504                         break; /* we are finish */
 505                 /* setup new read blocks */
 506                 /*      readblk=pFG->head*pFG->sect; */
 507                 readblk=pFG->sect;
 508                 if(readblk>blocks)
 509                         readblk=blocks;
 510 retrycal:
 511                 /* a seek is necessary */
 512                 if(fdc_seek(pCMD,pFG)==FALSE) {
 513                         stop_fdc_drive(pCMD);
 514                         enable_interrupts();
 515                         return FALSE;
 516                 }
 517                 if((pCMD->result[STATUS_0]&0x20)!=0x20) {
 518                         PRINTF("Seek error Status: %02X\n",pCMD->result[STATUS_0]);
 519                         stop_fdc_drive(pCMD);
 520                         return FALSE;
 521                 }
 522                 pcn=pCMD->result[STATUS_PCN]; /* current track */
 523         }while(TRUE); /* start over */
 524         stop_fdc_drive(pCMD); /* switch off drive */
 525         enable_interrupts();
 526         return TRUE;
 527 }
 528
 529 /* Scan all drives and check if drive is present and disk is inserted */
 530 int fdc_check_drive(FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
 531 {
 532         int i,drives,state;
 533   /* OK procedure of data book is satisfied.
 534          * trying to get some information over the drives */
 535         state=0; /* no drives, no disks */
 536         for(drives=0;drives<4;drives++) {
 537                 pCMD->drive=drives;
 538                 select_fdc_drive(pCMD);
 539                 pCMD->blnr=0; /* set to the 1st block */
 540                 if(fdc_recalibrate(pCMD,pFG)==FALSE)
 541                         break;
 542                 if((pCMD->result[STATUS_0]&0x10)==0x10)
 543                         break;
 544                 /* ok drive connected check for disk */
 545                 state|=(1<<drives);
 546                 pCMD->blnr=pFG->size; /* set to the last block */
 547                 if(fdc_seek(pCMD,pFG)==FALSE)
 548                         break;
 549                 pCMD->blnr=0; /* set to the 1st block */
 550                 if(fdc_recalibrate(pCMD,pFG)==FALSE)
 551                         break;
 552                 pCMD->cmd[COMMAND]=FDC_CMD_READ_ID;
 553                 if(fdc_issue_cmd(pCMD,pFG)==FALSE)
 554                         break;
 555                 state|=(0x10<<drives);
 556         }
 557         stop_fdc_drive(pCMD);
 558         for(i=0;i<4;i++) {
 559                 PRINTF("Floppy Drive %d %sconnected %sDisk inserted %s\n",i,
 560                         ((state&(1<<i))==(1<<i)) ? "":"not ",
 561                         ((state&(0x10<<i))==(0x10<<i)) ? "":"no ",
 562                         ((state&(0x10<<i))==(0x10<<i)) ? pFG->name : "");
 563         }
 564         pCMD->flags=state;
 565         return TRUE;
 566 }
 567
 568
 569 /**************************************************************************
 570 * int fdc_setup
 571 * setup the fdc according the datasheet
 572 * assuming in PS2 Mode
 573 */
 574 int fdc_setup(FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
 575 {
 576
 577         int i;
 578         /* first, we reset the FDC via the DOR */
 579         write_fdc_reg(FDC_DOR,0x00);
 580         for(i=0; i<255; i++) /* then we wait some time */
 581                 udelay(500);
 582         /* then, we clear the reset in the DOR */
 583         pCMD->drive=0;
 584         select_fdc_drive(pCMD);
 585         /* initialize the CCR */
 586         write_fdc_reg(FDC_CCR,pFG->rate);
 587         /* then initialize the DSR */
 588         write_fdc_reg(FDC_DSR,pFG->rate);
 589         if(wait_for_fdc_int()==FALSE) {
 590                         PRINTF("Time Out after writing CCR\n");
 591                         return FALSE;
 592         }
 593         /* now issue sense Interrupt and status command
 594          * assuming only one drive present (drive 0) */
 595         pCMD->dma=0; /* we don't use any dma at all */
 596         for(i=0;i<4;i++) {
 597                 /* issue sense interrupt for all 4 possible drives */
 598                 pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
 599                 if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
 600                         PRINTF("Sense Interrupt for drive %d failed\n",i);
 601                 }
 602         }
 603         /* assuming drive 0 for rest of configuration
 604          * issue the configure command */
 605         pCMD->drive=0;
 606         select_fdc_drive(pCMD);
 607         pCMD->cmd[COMMAND]=FDC_CMD_CONFIGURE;
 608         if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
 609                 PRINTF(" configure timeout\n");
 610                 stop_fdc_drive(pCMD);
 611                 return FALSE;
 612         }
 613         /* issue specify command */
 614         pCMD->cmd[COMMAND]=FDC_CMD_SPECIFY;
 615         if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
 616                 PRINTF(" specify timeout\n");
 617                 stop_fdc_drive(pCMD);
 618                 return FALSE;
 619
 620         }
 621         /* then, we clear the reset in the DOR */
 622         /* fdc_check_drive(pCMD,pFG);   */
 623         /*      write_fdc_reg(FDC_DOR,0x04); */
 624         return TRUE;
 625 }
 626
 627 /****************************************************************************
 628  * main routine do_fdcboot
 629  */
 630 int do_fdcboot (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 631 {
 632         FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
 633         FDC_COMMAND_STRUCT *pCMD = &cmd;
 634         unsigned long addr,imsize;
 635         image_header_t *hdr;  /* used for fdc boot */
 636         unsigned char boot_drive;
 637         int i,nrofblk;
 638         char *ep;
 639         int rcode = 0;
 640
 641         switch (argc) {
 642         case 1:
 643                 addr = CFG_LOAD_ADDR;
 644                 boot_drive=0; /* default boot from drive 0 */
 645                 break;
 646         case 2:
 647                 addr = simple_strtoul(argv[1], NULL, 16);
 648                 boot_drive=0; /* default boot from drive 0 */
 649                 break;
 650         case 3:
 651                 addr = simple_strtoul(argv[1], NULL, 16);
 652                 boot_drive=simple_strtoul(argv[2], NULL, 10);
 653                 break;
 654         default:
 655                 printf ("Usage:\n%s\n", cmdtp->usage);
 656                 return 1;
 657         }
 658         /* setup FDC and scan for drives  */
 659         if(fdc_setup(pCMD,pFG)==FALSE) {
 660                 printf("\n** Error in setup FDC **\n");
 661                 return 1;
 662         }
 663         if(fdc_check_drive(pCMD,pFG)==FALSE) {
 664                 printf("\n** Error in check_drives **\n");
 665                 return 1;
 666         }
 667         if((pCMD->flags&(1<<boot_drive))==0) {
 668                 /* drive not available */
 669                 printf("\n** Drive %d not availabe **\n",boot_drive);
 670                 return 1;
 671         }
 672         if((pCMD->flags&(0x10<<boot_drive))==0) {
 673                 /* no disk inserted */
 674                 printf("\n** No disk inserted in drive %d **\n",boot_drive);
 675                 return 1;
 676         }
 677         /* ok, we have a valid source */
 678         pCMD->drive=boot_drive;
 679         /* read first block */
 680         pCMD->blnr=0;
 681         if(fdc_read_data((unsigned char *)addr,1,pCMD,pFG)==FALSE) {
 682                 printf("\nRead error:");
 683                 for(i=0;i<7;i++)
 684                         printf("result%d: 0x%02X\n",i,pCMD->result[i]);
 685                 return 1;
 686         }
 687         hdr = (image_header_t *)addr;
 688         if (hdr->ih_magic  != IH_MAGIC) {
 689                 printf ("Bad Magic Number\n");
 690                 return 1;
 691         }
 692         print_image_hdr(hdr);
 693
 694         imsize= hdr->ih_size+sizeof(image_header_t);
 695         nrofblk=imsize/512;
 696         if((imsize%512)>0)
 697                 nrofblk++;
 698         printf("Loading %ld Bytes (%d blocks) at 0x%08lx..\n",imsize,nrofblk,addr);
 699         pCMD->blnr=0;
 700         if(fdc_read_data((unsigned char *)addr,nrofblk,pCMD,pFG)==FALSE) {
 701                 /* read image block */
 702                 printf("\nRead error:");
 703                 for(i=0;i<7;i++)
 704                         printf("result%d: 0x%02X\n",i,pCMD->result[i]);
 705                 return 1;
 706         }
 707         printf("OK %ld Bytes loaded.\n",imsize);
 708
 709         flush_cache (addr, imsize);
 710         /* Loading ok, update default load address */
 711
 712         load_addr = addr;
 713         if(hdr->ih_type  == IH_TYPE_KERNEL) {
 714                 /* Check if we should attempt an auto-start */
 715                 if (((ep = getenv("autostart")) != NULL) && (strcmp(ep,"yes") == 0)) {
 716                         char *local_args[2];
 717                         extern int do_bootm (cmd_tbl_t *, int, int, char *[]);
 718
 719                         local_args[0] = argv[0];
 720                         local_args[1] = NULL;
 721
 722                         printf ("Automatic boot of image at addr 0x%08lX ...\n", addr);
 723
 724                         do_bootm (cmdtp, 0, 1, local_args);
 725                         rcode ++;
 726                 }
 727         }
 728         return rcode;
 729 }
 730
 731
 732
 733 #endif /* CONFIG_COMMANDS & CFG_CMD_FDC */
 734
 735