LXR uboot/cmd/fdc.c

   1/*
   2 * (C) Copyright 2001
   3 * Denis Peter, MPL AG, d.peter@mpl.ch.
   4 *
   5 * SPDX-License-Identifier:     GPL-2.0+
   6 */
   7/*
   8 * Floppy Disk support
   9 */
  10
  11#include <common.h>
  12#include <config.h>
  13#include <command.h>
  14#include <image.h>
  15
  16
  17#undef  FDC_DEBUG
  18
  19#ifdef  FDC_DEBUG
  20#define PRINTF(fmt,args...)     printf (fmt ,##args)
  21#else
  22#define PRINTF(fmt,args...)
  23#endif
  24
  25/*#if defined(CONFIG_CMD_DATE) */
  26/*#include <rtc.h> */
  27/*#endif */
  28
  29typedef struct {
  30        int             flags;          /* connected drives ect */
  31        unsigned long   blnr;           /* Logical block nr */
  32        uchar           drive;          /* drive no */
  33        uchar           cmdlen;         /* cmd length */
  34        uchar           cmd[16];        /* cmd desc */
  35        uchar           dma;            /* if > 0 dma enabled */
  36        uchar           result[11];     /* status information */
  37        uchar           resultlen;      /* lenght of result */
  38} FDC_COMMAND_STRUCT;
  39
  40/* flags: only the lower 8bit used:
  41 * bit 0 if set drive 0 is present
  42 * bit 1 if set drive 1 is present
  43 * bit 2 if set drive 2 is present
  44 * bit 3 if set drive 3 is present
  45 * bit 4 if set disk in drive 0 is inserted
  46 * bit 5 if set disk in drive 1 is inserted
  47 * bit 6 if set disk in drive 2 is inserted
  48 * bit 7 if set disk in drive 4 is inserted
  49 */
  50
  51/* cmd indexes */
  52#define COMMAND                 0
  53#define DRIVE                   1
  54#define CONFIG0                 1
  55#define SPEC_HUTSRT             1
  56#define TRACK                   2
  57#define CONFIG1                 2
  58#define SPEC_HLT                2
  59#define HEAD                    3
  60#define CONFIG2                 3
  61#define SECTOR                  4
  62#define SECTOR_SIZE             5
  63#define LAST_TRACK              6
  64#define GAP                     7
  65#define DTL                     8
  66/* result indexes */
  67#define STATUS_0                0
  68#define STATUS_PCN              1
  69#define STATUS_1                1
  70#define STATUS_2                2
  71#define STATUS_TRACK            3
  72#define STATUS_HEAD             4
  73#define STATUS_SECT             5
  74#define STATUS_SECT_SIZE        6
  75
  76
  77/* Register addresses */
  78#define FDC_BASE        0x3F0
  79#define FDC_SRA         FDC_BASE + 0    /* Status Register A */
  80#define FDC_SRB         FDC_BASE + 1    /* Status Register B */
  81#define FDC_DOR         FDC_BASE + 2    /* Digital Output Register */
  82#define FDC_TDR         FDC_BASE + 3    /* Tape Drive Register */
  83#define FDC_DSR         FDC_BASE + 4    /* Data rate Register */
  84#define FDC_MSR         FDC_BASE + 4    /* Main Status Register */
  85#define FDC_FIFO        FDC_BASE + 5    /* FIFO */
  86#define FDC_DIR         FDC_BASE + 6    /* Digital Input Register */
  87#define FDC_CCR         FDC_BASE + 7    /* Configuration Control */
  88/* Commands */
  89#define FDC_CMD_SENSE_INT       0x08
  90#define FDC_CMD_CONFIGURE       0x13
  91#define FDC_CMD_SPECIFY         0x03
  92#define FDC_CMD_RECALIBRATE     0x07
  93#define FDC_CMD_READ            0x06
  94#define FDC_CMD_READ_TRACK      0x02
  95#define FDC_CMD_READ_ID         0x0A
  96#define FDC_CMD_DUMP_REG        0x0E
  97#define FDC_CMD_SEEK            0x0F
  98
  99#define FDC_CMD_SENSE_INT_LEN   0x01
 100#define FDC_CMD_CONFIGURE_LEN   0x04
 101#define FDC_CMD_SPECIFY_LEN     0x03
 102#define FDC_CMD_RECALIBRATE_LEN 0x02
 103#define FDC_CMD_READ_LEN        0x09
 104#define FDC_CMD_READ_TRACK_LEN  0x09
 105#define FDC_CMD_READ_ID_LEN     0x02
 106#define FDC_CMD_DUMP_REG_LEN    0x01
 107#define FDC_CMD_SEEK_LEN        0x03
 108
 109#define FDC_FIFO_THR            0x0C
 110#define FDC_FIFO_DIS            0x00
 111#define FDC_IMPLIED_SEEK        0x01
 112#define FDC_POLL_DIS            0x00
 113#define FDC_PRE_TRK             0x00
 114#define FDC_CONFIGURE           FDC_FIFO_THR | (FDC_POLL_DIS<<4) | (FDC_FIFO_DIS<<5) | (FDC_IMPLIED_SEEK << 6)
 115#define FDC_MFM_MODE            0x01 /* MFM enable */
 116#define FDC_SKIP_MODE           0x00 /* skip enable */
 117
 118#define FDC_TIME_OUT 100000 /* time out */
 119#define FDC_RW_RETRIES          3 /* read write retries */
 120#define FDC_CAL_RETRIES         3 /* calibration and seek retries */
 121
 122
 123/* Disk structure */
 124typedef struct  {
 125        unsigned int size;      /* nr of sectors total */
 126        unsigned int sect;      /* sectors per track */
 127        unsigned int head;      /* nr of heads */
 128        unsigned int track;     /* nr of tracks */
 129        unsigned int stretch;   /* !=0 means double track steps */
 130        unsigned char   gap;    /* gap1 size */
 131        unsigned char   rate;   /* data rate. |= 0x40 for perpendicular */
 132        unsigned char   spec1;  /* stepping rate, head unload time */
 133        unsigned char   fmt_gap;/* gap2 size */
 134        unsigned char hlt;      /* head load time */
 135        unsigned char sect_code;/* Sector Size code */
 136        const char      * name; /* used only for predefined formats */
 137} FD_GEO_STRUCT;
 138
 139
 140/* supported Floppy types (currently only one) */
 141const static FD_GEO_STRUCT floppy_type[2] = {
 142        { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,16,2,"H1440" },    /*  7 1.44MB 3.5"   */
 143        {    0, 0,0, 0,0,0x00,0x00,0x00,0x00, 0,0,NULL    },    /*  end of table    */
 144};
 145
 146static FDC_COMMAND_STRUCT cmd; /* global command struct */
 147
 148/* If the boot drive number is undefined, we assume it's drive 0             */
 149#ifndef CONFIG_SYS_FDC_DRIVE_NUMBER
 150#define CONFIG_SYS_FDC_DRIVE_NUMBER 0
 151#endif
 152
 153/* Hardware access */
 154#ifndef CONFIG_SYS_ISA_IO_STRIDE
 155#define CONFIG_SYS_ISA_IO_STRIDE 1
 156#endif
 157
 158#ifndef CONFIG_SYS_ISA_IO_OFFSET
 159#define CONFIG_SYS_ISA_IO_OFFSET 0
 160#endif
 161
 162/* Supporting Functions */
 163/* reads a Register of the FDC */
 164unsigned char read_fdc_reg(unsigned int addr)
 165{
 166        volatile unsigned char *val =
 167                (volatile unsigned char *)(CONFIG_SYS_ISA_IO_BASE_ADDRESS +
 168                                           (addr * CONFIG_SYS_ISA_IO_STRIDE) +
 169                                           CONFIG_SYS_ISA_IO_OFFSET);
 170
 171        return val [0];
 172}
 173
 174/* writes a Register of the FDC */
 175void write_fdc_reg(unsigned int addr, unsigned char val)
 176{
 177        volatile unsigned char *tmp =
 178                (volatile unsigned char *)(CONFIG_SYS_ISA_IO_BASE_ADDRESS +
 179                                           (addr * CONFIG_SYS_ISA_IO_STRIDE) +
 180                                           CONFIG_SYS_ISA_IO_OFFSET);
 181        tmp[0]=val;
 182}
 183
 184/* waits for an interrupt (polling) */
 185int wait_for_fdc_int(void)
 186{
 187        unsigned long timeout;
 188        timeout = FDC_TIME_OUT;
 189        while((read_fdc_reg(FDC_SRA)&0x80)==0) {
 190                timeout--;
 191                udelay(10);
 192                if(timeout==0) /* timeout occurred */
 193                        return false;
 194        }
 195        return true;
 196}
 197
 198/* reads a byte from the FIFO of the FDC and checks direction and RQM bit
 199   of the MSR. returns -1 if timeout, or byte if ok */
 200int read_fdc_byte(void)
 201{
 202        unsigned long timeout;
 203        timeout = FDC_TIME_OUT;
 204        while((read_fdc_reg(FDC_MSR)&0xC0)!=0xC0) {
 205                /* direction out and ready */
 206                udelay(10);
 207                timeout--;
 208                if(timeout==0) /* timeout occurred */
 209                        return -1;
 210        }
 211        return read_fdc_reg(FDC_FIFO);
 212}
 213
 214/* if the direction of the FIFO is wrong, this routine is used to
 215   empty the FIFO. Should _not_ be used */
 216int fdc_need_more_output(void)
 217{
 218        unsigned char c;
 219        while((read_fdc_reg(FDC_MSR)&0xC0)==0xC0)       {
 220                        c=(unsigned char)read_fdc_byte();
 221                        printf("Error: more output: %x\n",c);
 222        }
 223        return true;
 224}
 225
 226
 227/* writes a byte to the FIFO of the FDC and checks direction and RQM bit
 228   of the MSR */
 229int write_fdc_byte(unsigned char val)
 230{
 231        unsigned long timeout;
 232        timeout = FDC_TIME_OUT;
 233        while((read_fdc_reg(FDC_MSR)&0xC0)!=0x80) {
 234                /* direction in and ready for byte */
 235                timeout--;
 236                udelay(10);
 237                fdc_need_more_output();
 238                if(timeout==0) /* timeout occurred */
 239                        return false;
 240        }
 241        write_fdc_reg(FDC_FIFO,val);
 242        return true;
 243}
 244
 245/* sets up all FDC commands and issues it to the FDC. If
 246   the command causes direct results (no Execution Phase)
 247   the result is be read as well. */
 248
 249int fdc_issue_cmd(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
 250{
 251        int i;
 252        unsigned long head,track,sect,timeout;
 253        track = pCMD->blnr / (pFG->sect * pFG->head); /* track nr */
 254        sect =  pCMD->blnr % (pFG->sect * pFG->head); /* remaining blocks */
 255        head = sect / pFG->sect; /* head nr */
 256        sect =  sect % pFG->sect; /* remaining blocks */
 257        sect++; /* sectors are 1 based */
 258        PRINTF("Cmd 0x%02x Track %ld, Head %ld, Sector %ld, Drive %d (blnr %ld)\n",
 259                pCMD->cmd[0],track,head,sect,pCMD->drive,pCMD->blnr);
 260
 261        if(head|=0) { /* max heads = 2 */
 262                pCMD->cmd[DRIVE]=pCMD->drive | 0x04; /* head 1 */
 263                pCMD->cmd[HEAD]=(unsigned char) head; /* head register */
 264        }
 265        else {
 266                pCMD->cmd[DRIVE]=pCMD->drive; /* head 0 */
 267                pCMD->cmd[HEAD]=(unsigned char) head; /* head register */
 268        }
 269        pCMD->cmd[TRACK]=(unsigned char) track; /* track */
 270        switch (pCMD->cmd[COMMAND]) {
 271                case FDC_CMD_READ:
 272                        pCMD->cmd[SECTOR]=(unsigned char) sect; /* sector */
 273                        pCMD->cmd[SECTOR_SIZE]=pFG->sect_code; /* sector size code */
 274                        pCMD->cmd[LAST_TRACK]=pFG->sect; /* End of track */
 275                        pCMD->cmd[GAP]=pFG->gap; /* gap */
 276                        pCMD->cmd[DTL]=0xFF; /* DTL */
 277                        pCMD->cmdlen=FDC_CMD_READ_LEN;
 278                        pCMD->cmd[COMMAND]|=(FDC_MFM_MODE<<6); /* set MFM bit */
 279                        pCMD->cmd[COMMAND]|=(FDC_SKIP_MODE<<5); /* set Skip bit */
 280                        pCMD->resultlen=0;  /* result only after execution */
 281                        break;
 282                case FDC_CMD_SEEK:
 283                        pCMD->cmdlen=FDC_CMD_SEEK_LEN;
 284                        pCMD->resultlen=0;  /* no result */
 285                        break;
 286                case FDC_CMD_CONFIGURE:
 287                        pCMD->cmd[CONFIG0]=0;
 288                        pCMD->cmd[CONFIG1]=FDC_CONFIGURE; /* FIFO Threshold, Poll, Enable FIFO */
 289                        pCMD->cmd[CONFIG2]=FDC_PRE_TRK; /* Precompensation Track */
 290                        pCMD->cmdlen=FDC_CMD_CONFIGURE_LEN;
 291                        pCMD->resultlen=0;  /* no result */
 292                        break;
 293                case FDC_CMD_SPECIFY:
 294                        pCMD->cmd[SPEC_HUTSRT]=pFG->spec1;
 295                        pCMD->cmd[SPEC_HLT]=(pFG->hlt)<<1; /* head load time */
 296                        if(pCMD->dma==0)
 297                                pCMD->cmd[SPEC_HLT]|=0x1; /* no dma */
 298                        pCMD->cmdlen=FDC_CMD_SPECIFY_LEN;
 299                        pCMD->resultlen=0;  /* no result */
 300                        break;
 301                case FDC_CMD_DUMP_REG:
 302                        pCMD->cmdlen=FDC_CMD_DUMP_REG_LEN;
 303                        pCMD->resultlen=10;  /* 10 byte result */
 304                        break;
 305                case FDC_CMD_READ_ID:
 306                        pCMD->cmd[COMMAND]|=(FDC_MFM_MODE<<6); /* set MFM bit */
 307                        pCMD->cmdlen=FDC_CMD_READ_ID_LEN;
 308                        pCMD->resultlen=7;  /* 7 byte result */
 309                        break;
 310                case FDC_CMD_RECALIBRATE:
 311                        pCMD->cmd[DRIVE]&=0x03; /* don't set the head bit */
 312                        pCMD->cmdlen=FDC_CMD_RECALIBRATE_LEN;
 313                        pCMD->resultlen=0;  /* no result */
 314                        break;
 315                        break;
 316                case FDC_CMD_SENSE_INT:
 317                        pCMD->cmdlen=FDC_CMD_SENSE_INT_LEN;
 318                        pCMD->resultlen=2;
 319                        break;
 320        }
 321        for(i=0;i<pCMD->cmdlen;i++) {
 322                /* PRINTF("write cmd%d = 0x%02X\n",i,pCMD->cmd[i]); */
 323                if (write_fdc_byte(pCMD->cmd[i]) == false) {
 324                        PRINTF("Error: timeout while issue cmd%d\n",i);
 325                        return false;
 326                }
 327        }
 328        timeout=FDC_TIME_OUT;
 329        for(i=0;i<pCMD->resultlen;i++) {
 330                while((read_fdc_reg(FDC_MSR)&0xC0)!=0xC0) {
 331                        timeout--;
 332                        if(timeout==0) {
 333                                PRINTF(" timeout while reading result%d MSR=0x%02X\n",i,read_fdc_reg(FDC_MSR));
 334                                return false;
 335                        }
 336                }
 337                pCMD->result[i]=(unsigned char)read_fdc_byte();
 338        }
 339        return true;
 340}
 341
 342/* selects the drive assigned in the cmd structur and
 343   switches on the Motor */
 344void select_fdc_drive(FDC_COMMAND_STRUCT *pCMD)
 345{
 346        unsigned char val;
 347
 348        val=(1<<(4+pCMD->drive))|pCMD->drive|0xC; /* set reset, dma gate and motor bits */
 349        if((read_fdc_reg(FDC_DOR)&val)!=val) {
 350                write_fdc_reg(FDC_DOR,val);
 351                for(val=0;val<255;val++)
 352                        udelay(500); /* wait some time to start motor */
 353        }
 354}
 355
 356/* switches off the Motor of the specified drive */
 357void stop_fdc_drive(FDC_COMMAND_STRUCT *pCMD)
 358{
 359        unsigned char val;
 360
 361        val=(1<<(4+pCMD->drive))|pCMD->drive; /* sets motor bits */
 362        write_fdc_reg(FDC_DOR,(read_fdc_reg(FDC_DOR)&~val));
 363}
 364
 365/* issues a recalibrate command, waits for interrupt and
 366 * issues a sense_interrupt */
 367int fdc_recalibrate(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
 368{
 369        pCMD->cmd[COMMAND]=FDC_CMD_RECALIBRATE;
 370        if (fdc_issue_cmd(pCMD, pFG) == false)
 371                return false;
 372        while (wait_for_fdc_int() != true);
 373
 374        pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
 375        return(fdc_issue_cmd(pCMD,pFG));
 376}
 377
 378/* issues a recalibrate command, waits for interrupt and
 379 * issues a sense_interrupt */
 380int fdc_seek(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
 381{
 382        pCMD->cmd[COMMAND]=FDC_CMD_SEEK;
 383        if (fdc_issue_cmd(pCMD, pFG) == false)
 384                return false;
 385        while (wait_for_fdc_int() != true);
 386
 387        pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
 388        return(fdc_issue_cmd(pCMD,pFG));
 389}
 390
 391/* terminates current command, by not servicing the FIFO
 392 * waits for interrupt and fills in the result bytes */
 393int fdc_terminate(FDC_COMMAND_STRUCT *pCMD)
 394{
 395        int i;
 396        for(i=0;i<100;i++)
 397                udelay(500); /* wait 500usec for fifo overrun */
 398        while((read_fdc_reg(FDC_SRA)&0x80)==0x00); /* wait as long as no int has occurred */
 399        for(i=0;i<7;i++) {
 400                pCMD->result[i]=(unsigned char)read_fdc_byte();
 401        }
 402        return true;
 403}
 404
 405/* reads data from FDC, seek commands are issued automatic */
 406int fdc_read_data(unsigned char *buffer, unsigned long blocks,FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
 407{
 408  /* first seek to start address */
 409        unsigned long len,readblk,i,timeout,ii,offset;
 410        unsigned char c,retriesrw,retriescal;
 411        unsigned char *bufferw; /* working buffer */
 412        int sect_size;
 413        int flags;
 414
 415        flags=disable_interrupts(); /* switch off all Interrupts */
 416        select_fdc_drive(pCMD); /* switch on drive */
 417        sect_size=0x080<<pFG->sect_code;
 418        retriesrw=0;
 419        retriescal=0;
 420        offset=0;
 421        if (fdc_seek(pCMD, pFG) == false) {
 422                stop_fdc_drive(pCMD);
 423                if (flags)
 424                        enable_interrupts();
 425                return false;
 426        }
 427        if((pCMD->result[STATUS_0]&0x20)!=0x20) {
 428                printf("Seek error Status: %02X\n",pCMD->result[STATUS_0]);
 429                stop_fdc_drive(pCMD);
 430                if (flags)
 431                        enable_interrupts();
 432                return false;
 433        }
 434        /* now determine the next seek point */
 435        /*      lastblk=pCMD->blnr + blocks; */
 436        /*      readblk=(pFG->head*pFG->sect)-(pCMD->blnr%(pFG->head*pFG->sect)); */
 437        readblk=pFG->sect-(pCMD->blnr%pFG->sect);
 438        PRINTF("1st nr of block possible read %ld start %ld\n",readblk,pCMD->blnr);
 439        if(readblk>blocks) /* is end within 1st track */
 440                readblk=blocks; /* yes, correct it */
 441        PRINTF("we read %ld blocks start %ld\n",readblk,pCMD->blnr);
 442        bufferw = &buffer[0]; /* setup working buffer */
 443        do {
 444retryrw:
 445                len=sect_size * readblk;
 446                pCMD->cmd[COMMAND]=FDC_CMD_READ;
 447                if (fdc_issue_cmd(pCMD, pFG) == false) {
 448                        stop_fdc_drive(pCMD);
 449                        if (flags)
 450                                enable_interrupts();
 451                        return false;
 452                }
 453                for (i=0;i<len;i++) {
 454                        timeout=FDC_TIME_OUT;
 455                        do {
 456                                c=read_fdc_reg(FDC_MSR);
 457                                if((c&0xC0)==0xC0) {
 458                                        bufferw[i]=read_fdc_reg(FDC_FIFO);
 459                                        break;
 460                                }
 461                                if((c&0xC0)==0x80) { /* output */
 462                                        PRINTF("Transfer error transferred: at %ld, MSR=%02X\n",i,c);
 463                                        if(i>6) {
 464                                                for(ii=0;ii<7;ii++) {
 465                                                        pCMD->result[ii]=bufferw[(i-7+ii)];
 466                                                } /* for */
 467                                        }
 468                                        if(retriesrw++>FDC_RW_RETRIES) {
 469                                                if (retriescal++>FDC_CAL_RETRIES) {
 470                                                        stop_fdc_drive(pCMD);
 471                                                        if (flags)
 472                                                                enable_interrupts();
 473                                                        return false;
 474                                                }
 475                                                else {
 476                                                        PRINTF(" trying to recalibrate Try %d\n",retriescal);
 477                                                        if (fdc_recalibrate(pCMD, pFG) == false) {
 478                                                                stop_fdc_drive(pCMD);
 479                                                                if (flags)
 480                                                                        enable_interrupts();
 481                                                                return false;
 482                                                        }
 483                                                        retriesrw=0;
 484                                                        goto retrycal;
 485                                                } /* else >FDC_CAL_RETRIES */
 486                                        }
 487                                        else {
 488                                                PRINTF("Read retry %d\n",retriesrw);
 489                                                goto retryrw;
 490                                        } /* else >FDC_RW_RETRIES */
 491                                }/* if output */
 492                                timeout--;
 493                        } while (true);
 494                } /* for len */
 495                /* the last sector of a track or all data has been read,
 496                 * we need to get the results */
 497                fdc_terminate(pCMD);
 498                offset+=(sect_size*readblk); /* set up buffer pointer */
 499                bufferw = &buffer[offset];
 500                pCMD->blnr+=readblk; /* update current block nr */
 501                blocks-=readblk; /* update blocks */
 502                if(blocks==0)
 503                        break; /* we are finish */
 504                /* setup new read blocks */
 505                /*      readblk=pFG->head*pFG->sect; */
 506                readblk=pFG->sect;
 507                if(readblk>blocks)
 508                        readblk=blocks;
 509retrycal:
 510                /* a seek is necessary */
 511                if (fdc_seek(pCMD, pFG) == false) {
 512                        stop_fdc_drive(pCMD);
 513                        if (flags)
 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        } while (true); /* start over */
 523        stop_fdc_drive(pCMD); /* switch off drive */
 524        if (flags)
 525                enable_interrupts();
 526        return true;
 527}
 528
 529/* Scan all drives and check if drive is present and disk is inserted */
 530int 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                        continue;
 542                if((pCMD->result[STATUS_0]&0x10)==0x10)
 543                        continue;
 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                        continue;
 549                pCMD->blnr=0; /* set to the 1st block */
 550                if (fdc_recalibrate(pCMD, pFG) == false)
 551                        continue;
 552                pCMD->cmd[COMMAND]=FDC_CMD_READ_ID;
 553                if (fdc_issue_cmd(pCMD, pFG) == false)
 554                        continue;
 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*/
 574int fdc_setup(int drive, FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
 575{
 576        int i;
 577
 578#ifdef CONFIG_SYS_FDC_HW_INIT
 579        fdc_hw_init ();
 580#endif
 581        /* first, we reset the FDC via the DOR */
 582        write_fdc_reg(FDC_DOR,0x00);
 583        for(i=0; i<255; i++) /* then we wait some time */
 584                udelay(500);
 585        /* then, we clear the reset in the DOR */
 586        pCMD->drive=drive;
 587        select_fdc_drive(pCMD);
 588        /* initialize the CCR */
 589        write_fdc_reg(FDC_CCR,pFG->rate);
 590        /* then initialize the DSR */
 591        write_fdc_reg(FDC_DSR,pFG->rate);
 592        if (wait_for_fdc_int() == false) {
 593                        PRINTF("Time Out after writing CCR\n");
 594                        return false;
 595        }
 596        /* now issue sense Interrupt and status command
 597         * assuming only one drive present (drive 0) */
 598        pCMD->dma=0; /* we don't use any dma at all */
 599        for(i=0;i<4;i++) {
 600                /* issue sense interrupt for all 4 possible drives */
 601                pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
 602                if (fdc_issue_cmd(pCMD, pFG) == false) {
 603                        PRINTF("Sense Interrupt for drive %d failed\n",i);
 604                }
 605        }
 606        /* issue the configure command */
 607        pCMD->drive=drive;
 608        select_fdc_drive(pCMD);
 609        pCMD->cmd[COMMAND]=FDC_CMD_CONFIGURE;
 610        if (fdc_issue_cmd(pCMD, pFG) == false) {
 611                PRINTF(" configure timeout\n");
 612                stop_fdc_drive(pCMD);
 613                return false;
 614        }
 615        /* issue specify command */
 616        pCMD->cmd[COMMAND]=FDC_CMD_SPECIFY;
 617        if (fdc_issue_cmd(pCMD, pFG) == false) {
 618                PRINTF(" specify timeout\n");
 619                stop_fdc_drive(pCMD);
 620                return false;
 621
 622        }
 623        /* then, we clear the reset in the DOR */
 624        /* fdc_check_drive(pCMD,pFG);   */
 625        /*      write_fdc_reg(FDC_DOR,0x04); */
 626
 627        return true;
 628}
 629
 630/****************************************************************************
 631 * main routine do_fdcboot
 632 */
 633int do_fdcboot (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 634{
 635        FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
 636        FDC_COMMAND_STRUCT *pCMD = &cmd;
 637        unsigned long addr,imsize;
 638#if defined(CONFIG_IMAGE_FORMAT_LEGACY)
 639        image_header_t *hdr;  /* used for fdc boot */
 640#endif
 641        unsigned char boot_drive;
 642        int i,nrofblk;
 643#if defined(CONFIG_FIT)
 644        const void *fit_hdr = NULL;
 645#endif
 646
 647        switch (argc) {
 648        case 1:
 649                addr = CONFIG_SYS_LOAD_ADDR;
 650                boot_drive=CONFIG_SYS_FDC_DRIVE_NUMBER;
 651                break;
 652        case 2:
 653                addr = simple_strtoul(argv[1], NULL, 16);
 654                boot_drive=CONFIG_SYS_FDC_DRIVE_NUMBER;
 655                break;
 656        case 3:
 657                addr = simple_strtoul(argv[1], NULL, 16);
 658                boot_drive=simple_strtoul(argv[2], NULL, 10);
 659                break;
 660        default:
 661                return CMD_RET_USAGE;
 662        }
 663        /* setup FDC and scan for drives  */
 664        if (fdc_setup(boot_drive, pCMD, pFG) == false) {
 665                printf("\n** Error in setup FDC **\n");
 666                return 1;
 667        }
 668        if (fdc_check_drive(pCMD, pFG) == false) {
 669                printf("\n** Error in check_drives **\n");
 670                return 1;
 671        }
 672        if((pCMD->flags&(1<<boot_drive))==0) {
 673                /* drive not available */
 674                printf("\n** Drive %d not availabe **\n",boot_drive);
 675                return 1;
 676        }
 677        if((pCMD->flags&(0x10<<boot_drive))==0) {
 678                /* no disk inserted */
 679                printf("\n** No disk inserted in drive %d **\n",boot_drive);
 680                return 1;
 681        }
 682        /* ok, we have a valid source */
 683        pCMD->drive=boot_drive;
 684        /* read first block */
 685        pCMD->blnr=0;
 686        if (fdc_read_data((unsigned char *)addr, 1, pCMD, pFG) == false) {
 687                printf("\nRead error:");
 688                for(i=0;i<7;i++)
 689                        printf("result%d: 0x%02X\n",i,pCMD->result[i]);
 690                return 1;
 691        }
 692
 693        switch (genimg_get_format ((void *)addr)) {
 694#if defined(CONFIG_IMAGE_FORMAT_LEGACY)
 695        case IMAGE_FORMAT_LEGACY:
 696                hdr = (image_header_t *)addr;
 697                image_print_contents (hdr);
 698
 699                imsize = image_get_image_size (hdr);
 700                break;
 701#endif
 702#if defined(CONFIG_FIT)
 703        case IMAGE_FORMAT_FIT:
 704                fit_hdr = (const void *)addr;
 705                puts ("Fit image detected...\n");
 706
 707                imsize = fit_get_size (fit_hdr);
 708                break;
 709#endif
 710        default:
 711                puts ("** Unknown image type\n");
 712                return 1;
 713        }
 714
 715        nrofblk=imsize/512;
 716        if((imsize%512)>0)
 717                nrofblk++;
 718        printf("Loading %ld Bytes (%d blocks) at 0x%08lx..\n",imsize,nrofblk,addr);
 719        pCMD->blnr=0;
 720        if (fdc_read_data((unsigned char *)addr, nrofblk, pCMD, pFG) == false) {
 721                /* read image block */
 722                printf("\nRead error:");
 723                for(i=0;i<7;i++)
 724                        printf("result%d: 0x%02X\n",i,pCMD->result[i]);
 725                return 1;
 726        }
 727        printf("OK %ld Bytes loaded.\n",imsize);
 728
 729        flush_cache (addr, imsize);
 730
 731#if defined(CONFIG_FIT)
 732        /* This cannot be done earlier, we need complete FIT image in RAM first */
 733        if (genimg_get_format ((void *)addr) == IMAGE_FORMAT_FIT) {
 734                if (!fit_check_format (fit_hdr)) {
 735                        puts ("** Bad FIT image format\n");
 736                        return 1;
 737                }
 738                fit_print_contents (fit_hdr);
 739        }
 740#endif
 741
 742        /* Loading ok, update default load address */
 743        load_addr = addr;
 744
 745        return bootm_maybe_autostart(cmdtp, argv[0]);
 746}
 747
 748U_BOOT_CMD(
 749        fdcboot,        3,      1,      do_fdcboot,
 750        "boot from floppy device",
 751        "loadAddr drive"
 752);
 753