/*
 * (C) Copyright 2001
 * Denis Peter, MPL AG, d.peter@mpl.ch.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 *
 */
/*
 * Floppy Disk support
 */

#include <common.h>
#include <config.h>
#include <command.h>
#include <image.h>


#undef  FDC_DEBUG

#ifdef  FDC_DEBUG
#define PRINTF(fmt,args...)     printf (fmt ,##args)
#else
#define PRINTF(fmt,args...)
#endif

#ifndef TRUE
#define TRUE            1
#endif
#ifndef FALSE
#define FALSE           0
#endif

/*#if defined(CONFIG_CMD_DATE) */
/*#include <rtc.h> */
/*#endif */

typedef struct {
        int             flags;          /* connected drives ect */
        unsigned long   blnr;           /* Logical block nr */
        uchar           drive;          /* drive no */
        uchar           cmdlen;         /* cmd length */
        uchar           cmd[16];        /* cmd desc */
        uchar           dma;            /* if > 0 dma enabled */
        uchar           result[11];     /* status information */
        uchar           resultlen;      /* lenght of result */
} FDC_COMMAND_STRUCT;

/* flags: only the lower 8bit used:
 * bit 0 if set drive 0 is present
 * bit 1 if set drive 1 is present
 * bit 2 if set drive 2 is present
 * bit 3 if set drive 3 is present
 * bit 4 if set disk in drive 0 is inserted
 * bit 5 if set disk in drive 1 is inserted
 * bit 6 if set disk in drive 2 is inserted
 * bit 7 if set disk in drive 4 is inserted
 */

/* cmd indexes */
#define COMMAND                 0
#define DRIVE                   1
#define CONFIG0                 1
#define SPEC_HUTSRT             1
#define TRACK                   2
#define CONFIG1                 2
#define SPEC_HLT                2
#define HEAD                    3
#define CONFIG2                 3
#define SECTOR                  4
#define SECTOR_SIZE             5
#define LAST_TRACK              6
#define GAP                     7
#define DTL                     8
/* result indexes */
#define STATUS_0                0
#define STATUS_PCN              1
#define STATUS_1                1
#define STATUS_2                2
#define STATUS_TRACK            3
#define STATUS_HEAD             4
#define STATUS_SECT             5
#define STATUS_SECT_SIZE        6


/* Register addresses */
#define FDC_BASE        0x3F0
#define FDC_SRA         FDC_BASE + 0    /* Status Register A */
#define FDC_SRB         FDC_BASE + 1    /* Status Register B */
#define FDC_DOR         FDC_BASE + 2    /* Digital Output Register */
#define FDC_TDR         FDC_BASE + 3    /* Tape Drive Register */
#define FDC_DSR         FDC_BASE + 4    /* Data rate Register */
#define FDC_MSR         FDC_BASE + 4    /* Main Status Register */
#define FDC_FIFO        FDC_BASE + 5    /* FIFO */
#define FDC_DIR         FDC_BASE + 6    /* Digital Input Register */
#define FDC_CCR         FDC_BASE + 7    /* Configuration Control */
/* Commands */
#define FDC_CMD_SENSE_INT       0x08
#define FDC_CMD_CONFIGURE       0x13
#define FDC_CMD_SPECIFY         0x03
#define FDC_CMD_RECALIBRATE     0x07
#define FDC_CMD_READ            0x06
#define FDC_CMD_READ_TRACK      0x02
#define FDC_CMD_READ_ID         0x0A
#define FDC_CMD_DUMP_REG        0x0E
#define FDC_CMD_SEEK            0x0F

#define FDC_CMD_SENSE_INT_LEN   0x01
#define FDC_CMD_CONFIGURE_LEN   0x04
#define FDC_CMD_SPECIFY_LEN     0x03
#define FDC_CMD_RECALIBRATE_LEN 0x02
#define FDC_CMD_READ_LEN        0x09
#define FDC_CMD_READ_TRACK_LEN  0x09
#define FDC_CMD_READ_ID_LEN     0x02
#define FDC_CMD_DUMP_REG_LEN    0x01
#define FDC_CMD_SEEK_LEN        0x03

#define FDC_FIFO_THR            0x0C
#define FDC_FIFO_DIS            0x00
#define FDC_IMPLIED_SEEK        0x01
#define FDC_POLL_DIS            0x00
#define FDC_PRE_TRK             0x00
#define FDC_CONFIGURE           FDC_FIFO_THR | (FDC_POLL_DIS<<4) | (FDC_FIFO_DIS<<5) | (FDC_IMPLIED_SEEK << 6)
#define FDC_MFM_MODE            0x01 /* MFM enable */
#define FDC_SKIP_MODE           0x00 /* skip enable */

#define FDC_TIME_OUT 100000 /* time out */
#define FDC_RW_RETRIES          3 /* read write retries */
#define FDC_CAL_RETRIES         3 /* calibration and seek retries */


/* Disk structure */
typedef struct  {
        unsigned int size;      /* nr of sectors total */
        unsigned int sect;      /* sectors per track */
        unsigned int head;      /* nr of heads */
        unsigned int track;     /* nr of tracks */
        unsigned int stretch;   /* !=0 means double track steps */
        unsigned char   gap;    /* gap1 size */
        unsigned char   rate;   /* data rate. |= 0x40 for perpendicular */
        unsigned char   spec1;  /* stepping rate, head unload time */
        unsigned char   fmt_gap;/* gap2 size */
        unsigned char hlt;      /* head load time */
        unsigned char sect_code;/* Sector Size code */
        const char      * name; /* used only for predefined formats */
} FD_GEO_STRUCT;


/* supported Floppy types (currently only one) */
const static FD_GEO_STRUCT floppy_type[2] = {
        { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,16,2,"H1440" },    /*  7 1.44MB 3.5"   */
        {    0, 0,0, 0,0,0x00,0x00,0x00,0x00, 0,0,NULL    },    /*  end of table    */
};

static FDC_COMMAND_STRUCT cmd; /* global command struct */

/* If the boot drive number is undefined, we assume it's drive 0             */
#ifndef CONFIG_SYS_FDC_DRIVE_NUMBER
#define CONFIG_SYS_FDC_DRIVE_NUMBER 0
#endif

/* Hardware access */
#ifndef CONFIG_SYS_ISA_IO_STRIDE
#define CONFIG_SYS_ISA_IO_STRIDE 1
#endif

#ifndef CONFIG_SYS_ISA_IO_OFFSET
#define CONFIG_SYS_ISA_IO_OFFSET 0
#endif

/* Supporting Functions */
/* reads a Register of the FDC */
unsigned char read_fdc_reg(unsigned int addr)
{
        volatile unsigned char *val =
                (volatile unsigned char *)(CONFIG_SYS_ISA_IO_BASE_ADDRESS +
                                           (addr * CONFIG_SYS_ISA_IO_STRIDE) +
                                           CONFIG_SYS_ISA_IO_OFFSET);

        return val [0];
}

/* writes a Register of the FDC */
void write_fdc_reg(unsigned int addr, unsigned char val)
{
        volatile unsigned char *tmp =
                (volatile unsigned char *)(CONFIG_SYS_ISA_IO_BASE_ADDRESS +
                                           (addr * CONFIG_SYS_ISA_IO_STRIDE) +
                                           CONFIG_SYS_ISA_IO_OFFSET);
        tmp[0]=val;
}

/* waits for an interrupt (polling) */
int wait_for_fdc_int(void)
{
        unsigned long timeout;
        timeout = FDC_TIME_OUT;
        while((read_fdc_reg(FDC_SRA)&0x80)==0) {
                timeout--;
                udelay(10);
                if(timeout==0) /* timeout occured */
                        return FALSE;
        }
        return TRUE;
}

/* reads a byte from the FIFO of the FDC and checks direction and RQM bit
   of the MSR. returns -1 if timeout, or byte if ok */
int read_fdc_byte(void)
{
        unsigned long timeout;
        timeout = FDC_TIME_OUT;
        while((read_fdc_reg(FDC_MSR)&0xC0)!=0xC0) {
                /* direction out and ready */
                udelay(10);
                timeout--;
                if(timeout==0) /* timeout occured */
                        return -1;
        }
        return read_fdc_reg(FDC_FIFO);
}

/* if the direction of the FIFO is wrong, this routine is used to
   empty the FIFO. Should _not_ be used */
int fdc_need_more_output(void)
{
        unsigned char c;
        while((read_fdc_reg(FDC_MSR)&0xC0)==0xC0)       {
                        c=(unsigned char)read_fdc_byte();
                        printf("Error: more output: %x\n",c);
        }
        return TRUE;
}


/* writes a byte to the FIFO of the FDC and checks direction and RQM bit
   of the MSR */
int write_fdc_byte(unsigned char val)
{
        unsigned long timeout;
        timeout = FDC_TIME_OUT;
        while((read_fdc_reg(FDC_MSR)&0xC0)!=0x80) {
                /* direction in and ready for byte */
                timeout--;
                udelay(10);
                fdc_need_more_output();
                if(timeout==0) /* timeout occured */
                        return FALSE;
        }
        write_fdc_reg(FDC_FIFO,val);
        return TRUE;
}

/* sets up all FDC commands and issues it to the FDC. If
   the command causes direct results (no Execution Phase)
   the result is be read as well. */

int fdc_issue_cmd(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
{
        int i;
        unsigned long head,track,sect,timeout;
        track = pCMD->blnr / (pFG->sect * pFG->head); /* track nr */
        sect =  pCMD->blnr % (pFG->sect * pFG->head); /* remaining blocks */
        head = sect / pFG->sect; /* head nr */
        sect =  sect % pFG->sect; /* remaining blocks */
        sect++; /* sectors are 1 based */
        PRINTF("Cmd 0x%02x Track %ld, Head %ld, Sector %ld, Drive %d (blnr %ld)\n",
                pCMD->cmd[0],track,head,sect,pCMD->drive,pCMD->blnr);

        if(head|=0) { /* max heads = 2 */
                pCMD->cmd[DRIVE]=pCMD->drive | 0x04; /* head 1 */
                pCMD->cmd[HEAD]=(unsigned char) head; /* head register */
        }
        else {
                pCMD->cmd[DRIVE]=pCMD->drive; /* head 0 */
                pCMD->cmd[HEAD]=(unsigned char) head; /* head register */
        }
        pCMD->cmd[TRACK]=(unsigned char) track; /* track */
        switch (pCMD->cmd[COMMAND]) {
                case FDC_CMD_READ:
                        pCMD->cmd[SECTOR]=(unsigned char) sect; /* sector */
                        pCMD->cmd[SECTOR_SIZE]=pFG->sect_code; /* sector size code */
                        pCMD->cmd[LAST_TRACK]=pFG->sect; /* End of track */
                        pCMD->cmd[GAP]=pFG->gap; /* gap */
                        pCMD->cmd[DTL]=0xFF; /* DTL */
                        pCMD->cmdlen=FDC_CMD_READ_LEN;
                        pCMD->cmd[COMMAND]|=(FDC_MFM_MODE<<6); /* set MFM bit */
                        pCMD->cmd[COMMAND]|=(FDC_SKIP_MODE<<5); /* set Skip bit */
                        pCMD->resultlen=0;  /* result only after execution */
                        break;
                case FDC_CMD_SEEK:
                        pCMD->cmdlen=FDC_CMD_SEEK_LEN;
                        pCMD->resultlen=0;  /* no result */
                        break;
                case FDC_CMD_CONFIGURE:
                        pCMD->cmd[CONFIG0]=0;
                        pCMD->cmd[CONFIG1]=FDC_CONFIGURE; /* FIFO Threshold, Poll, Enable FIFO */
                        pCMD->cmd[CONFIG2]=FDC_PRE_TRK; /* Precompensation Track */
                        pCMD->cmdlen=FDC_CMD_CONFIGURE_LEN;
                        pCMD->resultlen=0;  /* no result */
                        break;
                case FDC_CMD_SPECIFY:
                        pCMD->cmd[SPEC_HUTSRT]=pFG->spec1;
                        pCMD->cmd[SPEC_HLT]=(pFG->hlt)<<1; /* head load time */
                        if(pCMD->dma==0)
                                pCMD->cmd[SPEC_HLT]|=0x1; /* no dma */
                        pCMD->cmdlen=FDC_CMD_SPECIFY_LEN;
                        pCMD->resultlen=0;  /* no result */
                        break;
                case FDC_CMD_DUMP_REG:
                        pCMD->cmdlen=FDC_CMD_DUMP_REG_LEN;
                        pCMD->resultlen=10;  /* 10 byte result */
                        break;
                case FDC_CMD_READ_ID:
                        pCMD->cmd[COMMAND]|=(FDC_MFM_MODE<<6); /* set MFM bit */
                        pCMD->cmdlen=FDC_CMD_READ_ID_LEN;
                        pCMD->resultlen=7;  /* 7 byte result */
                        break;
                case FDC_CMD_RECALIBRATE:
                        pCMD->cmd[DRIVE]&=0x03; /* don't set the head bit */
                        pCMD->cmdlen=FDC_CMD_RECALIBRATE_LEN;
                        pCMD->resultlen=0;  /* no result */
                        break;
                        break;
                case FDC_CMD_SENSE_INT:
                        pCMD->cmdlen=FDC_CMD_SENSE_INT_LEN;
                        pCMD->resultlen=2;
                        break;
        }
        for(i=0;i<pCMD->cmdlen;i++) {
                /* PRINTF("write cmd%d = 0x%02X\n",i,pCMD->cmd[i]); */
                if(write_fdc_byte(pCMD->cmd[i])==FALSE) {
                        PRINTF("Error: timeout while issue cmd%d\n",i);
                        return FALSE;
                }
        }
        timeout=FDC_TIME_OUT;
        for(i=0;i<pCMD->resultlen;i++) {
                while((read_fdc_reg(FDC_MSR)&0xC0)!=0xC0) {
                        timeout--;
                        if(timeout==0) {
                                PRINTF(" timeout while reading result%d MSR=0x%02X\n",i,read_fdc_reg(FDC_MSR));
                                return FALSE;
                        }
                }
                pCMD->result[i]=(unsigned char)read_fdc_byte();
        }
        return TRUE;
}

/* selects the drive assigned in the cmd structur and
   switches on the Motor */
void select_fdc_drive(FDC_COMMAND_STRUCT *pCMD)
{
        unsigned char val;

        val=(1<<(4+pCMD->drive))|pCMD->drive|0xC; /* set reset, dma gate and motor bits */
        if((read_fdc_reg(FDC_DOR)&val)!=val) {
                write_fdc_reg(FDC_DOR,val);
                for(val=0;val<255;val++)
                        udelay(500); /* wait some time to start motor */
        }
}

/* switches off the Motor of the specified drive */
void stop_fdc_drive(FDC_COMMAND_STRUCT *pCMD)
{
        unsigned char val;

        val=(1<<(4+pCMD->drive))|pCMD->drive; /* sets motor bits */
        write_fdc_reg(FDC_DOR,(read_fdc_reg(FDC_DOR)&~val));
}

/* issues a recalibrate command, waits for interrupt and
 * issues a sense_interrupt */
int fdc_recalibrate(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
{
        pCMD->cmd[COMMAND]=FDC_CMD_RECALIBRATE;
        if(fdc_issue_cmd(pCMD,pFG)==FALSE)
                return FALSE;
        while(wait_for_fdc_int()!=TRUE);
        pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
        return(fdc_issue_cmd(pCMD,pFG));
}

/* issues a recalibrate command, waits for interrupt and
 * issues a sense_interrupt */
int fdc_seek(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
{
        pCMD->cmd[COMMAND]=FDC_CMD_SEEK;
        if(fdc_issue_cmd(pCMD,pFG)==FALSE)
                return FALSE;
        while(wait_for_fdc_int()!=TRUE);
        pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
        return(fdc_issue_cmd(pCMD,pFG));
}

/* terminates current command, by not servicing the FIFO
 * waits for interrupt and fills in the result bytes */
int fdc_terminate(FDC_COMMAND_STRUCT *pCMD)
{
        int i;
        for(i=0;i<100;i++)
                udelay(500); /* wait 500usec for fifo overrun */
        while((read_fdc_reg(FDC_SRA)&0x80)==0x00); /* wait as long as no int has occured */
        for(i=0;i<7;i++) {
                pCMD->result[i]=(unsigned char)read_fdc_byte();
        }
        return TRUE;
}

/* reads data from FDC, seek commands are issued automatic */
int fdc_read_data(unsigned char *buffer, unsigned long blocks,FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
{
  /* first seek to start address */
        unsigned long len,lastblk,readblk,i,timeout,ii,offset;
        unsigned char pcn,c,retriesrw,retriescal;
        unsigned char *bufferw; /* working buffer */
        int sect_size;
        int flags;

        flags=disable_interrupts(); /* switch off all Interrupts */
        select_fdc_drive(pCMD); /* switch on drive */
        sect_size=0x080<<pFG->sect_code;
        retriesrw=0;
        retriescal=0;
        offset=0;
        if(fdc_seek(pCMD,pFG)==FALSE) {
                stop_fdc_drive(pCMD);
                enable_interrupts();
                return FALSE;
        }
        if((pCMD->result[STATUS_0]&0x20)!=0x20) {
                printf("Seek error Status: %02X\n",pCMD->result[STATUS_0]);
                stop_fdc_drive(pCMD);
                enable_interrupts();
                return FALSE;
        }
        pcn=pCMD->result[STATUS_PCN]; /* current track */
        /* now determine the next seek point */
        lastblk=pCMD->blnr + blocks;
        /*      readblk=(pFG->head*pFG->sect)-(pCMD->blnr%(pFG->head*pFG->sect)); */
        readblk=pFG->sect-(pCMD->blnr%pFG->sect);
        PRINTF("1st nr of block possible read %ld start %ld\n",readblk,pCMD->blnr);
        if(readblk>blocks) /* is end within 1st track */
                readblk=blocks; /* yes, correct it */
        PRINTF("we read %ld blocks start %ld\n",readblk,pCMD->blnr);
        bufferw = &buffer[0]; /* setup working buffer */
        do {
retryrw:
                len=sect_size * readblk;
                pCMD->cmd[COMMAND]=FDC_CMD_READ;
                if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
                        stop_fdc_drive(pCMD);
                        enable_interrupts();
                        return FALSE;
                }
                for (i=0;i<len;i++) {
                        timeout=FDC_TIME_OUT;
                        do {
                                c=read_fdc_reg(FDC_MSR);
                                if((c&0xC0)==0xC0) {
                                        bufferw[i]=read_fdc_reg(FDC_FIFO);
                                        break;
                                }
                                if((c&0xC0)==0x80) { /* output */
                                        PRINTF("Transfer error transfered: at %ld, MSR=%02X\n",i,c);
                                        if(i>6) {
                                                for(ii=0;ii<7;ii++) {
                                                        pCMD->result[ii]=bufferw[(i-7+ii)];
                                                } /* for */
                                        }
                                        if(retriesrw++>FDC_RW_RETRIES) {
                                                if (retriescal++>FDC_CAL_RETRIES) {
                                                        stop_fdc_drive(pCMD);
                                                        enable_interrupts();
                                                        return FALSE;
                                                }
                                                else {
                                                        PRINTF(" trying to recalibrate Try %d\n",retriescal);
                                                        if(fdc_recalibrate(pCMD,pFG)==FALSE) {
                                                                stop_fdc_drive(pCMD);
                                                                enable_interrupts();
                                                                return FALSE;
                                                        }
                                                        retriesrw=0;
                                                        goto retrycal;
                                                } /* else >FDC_CAL_RETRIES */
                                        }
                                        else {
                                                PRINTF("Read retry %d\n",retriesrw);
                                                goto retryrw;
                                        } /* else >FDC_RW_RETRIES */
                                }/* if output */
                                timeout--;
                        }while(TRUE);
                } /* for len */
                /* the last sector of a track or all data has been read,
                 * we need to get the results */
                fdc_terminate(pCMD);
                offset+=(sect_size*readblk); /* set up buffer pointer */
                bufferw = &buffer[offset];
                pCMD->blnr+=readblk; /* update current block nr */
                blocks-=readblk; /* update blocks */
                if(blocks==0)
                        break; /* we are finish */
                /* setup new read blocks */
                /*      readblk=pFG->head*pFG->sect; */
                readblk=pFG->sect;
                if(readblk>blocks)
                        readblk=blocks;
retrycal:
                /* a seek is necessary */
                if(fdc_seek(pCMD,pFG)==FALSE) {
                        stop_fdc_drive(pCMD);
                        enable_interrupts();
                        return FALSE;
                }
                if((pCMD->result[STATUS_0]&0x20)!=0x20) {
                        PRINTF("Seek error Status: %02X\n",pCMD->result[STATUS_0]);
                        stop_fdc_drive(pCMD);
                        return FALSE;
                }
                pcn=pCMD->result[STATUS_PCN]; /* current track */
        }while(TRUE); /* start over */
        stop_fdc_drive(pCMD); /* switch off drive */
        enable_interrupts();
        return TRUE;
}

/* Scan all drives and check if drive is present and disk is inserted */
int fdc_check_drive(FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
{
        int i,drives,state;
  /* OK procedure of data book is satisfied.
         * trying to get some information over the drives */
        state=0; /* no drives, no disks */
        for(drives=0;drives<4;drives++) {
                pCMD->drive=drives;
                select_fdc_drive(pCMD);
                pCMD->blnr=0; /* set to the 1st block */
                if(fdc_recalibrate(pCMD,pFG)==FALSE)
                        continue;
                if((pCMD->result[STATUS_0]&0x10)==0x10)
                        continue;
                /* ok drive connected check for disk */
                state|=(1<<drives);
                pCMD->blnr=pFG->size; /* set to the last block */
                if(fdc_seek(pCMD,pFG)==FALSE)
                        continue;
                pCMD->blnr=0; /* set to the 1st block */
                if(fdc_recalibrate(pCMD,pFG)==FALSE)
                        continue;
                pCMD->cmd[COMMAND]=FDC_CMD_READ_ID;
                if(fdc_issue_cmd(pCMD,pFG)==FALSE)
                        continue;
                state|=(0x10<<drives);
        }
        stop_fdc_drive(pCMD);
        for(i=0;i<4;i++) {
                PRINTF("Floppy Drive %d %sconnected %sDisk inserted %s\n",i,
                        ((state&(1<<i))==(1<<i)) ? "":"not ",
                        ((state&(0x10<<i))==(0x10<<i)) ? "":"no ",
                        ((state&(0x10<<i))==(0x10<<i)) ? pFG->name : "");
        }
        pCMD->flags=state;
        return TRUE;
}


/**************************************************************************
* int fdc_setup
* setup the fdc according the datasheet
* assuming in PS2 Mode
*/
int fdc_setup(int drive, FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
{
        int i;

#ifdef CONFIG_SYS_FDC_HW_INIT
        fdc_hw_init ();
#endif
        /* first, we reset the FDC via the DOR */
        write_fdc_reg(FDC_DOR,0x00);
        for(i=0; i<255; i++) /* then we wait some time */
                udelay(500);
        /* then, we clear the reset in the DOR */
        pCMD->drive=drive;
        select_fdc_drive(pCMD);
        /* initialize the CCR */
        write_fdc_reg(FDC_CCR,pFG->rate);
        /* then initialize the DSR */
        write_fdc_reg(FDC_DSR,pFG->rate);
        if(wait_for_fdc_int()==FALSE) {
                        PRINTF("Time Out after writing CCR\n");
                        return FALSE;
        }
        /* now issue sense Interrupt and status command
         * assuming only one drive present (drive 0) */
        pCMD->dma=0; /* we don't use any dma at all */
        for(i=0;i<4;i++) {
                /* issue sense interrupt for all 4 possible drives */
                pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
                if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
                        PRINTF("Sense Interrupt for drive %d failed\n",i);
                }
        }
        /* issue the configure command */
        pCMD->drive=drive;
        select_fdc_drive(pCMD);
        pCMD->cmd[COMMAND]=FDC_CMD_CONFIGURE;
        if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
                PRINTF(" configure timeout\n");
                stop_fdc_drive(pCMD);
                return FALSE;
        }
        /* issue specify command */
        pCMD->cmd[COMMAND]=FDC_CMD_SPECIFY;
        if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
                PRINTF(" specify timeout\n");
                stop_fdc_drive(pCMD);
                return FALSE;

        }
        /* then, we clear the reset in the DOR */
        /* fdc_check_drive(pCMD,pFG);   */
        /*      write_fdc_reg(FDC_DOR,0x04); */

        return TRUE;
}

#if defined(CONFIG_CMD_FDOS)

/* Low level functions for the Floppy-DOS layer                              */

/**************************************************************************
* int fdc_fdos_init
* initialize the FDC layer
*
*/
int fdc_fdos_init (int drive)
{
        FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
        FDC_COMMAND_STRUCT *pCMD = &cmd;

        /* setup FDC and scan for drives  */
        if(fdc_setup(drive,pCMD,pFG)==FALSE) {
                printf("\n** Error in setup FDC **\n");
                return FALSE;
        }
        if(fdc_check_drive(pCMD,pFG)==FALSE) {
                printf("\n** Error in check_drives **\n");
                return FALSE;
        }
        if((pCMD->flags&(1<<drive))==0) {
                /* drive not available */
                printf("\n** Drive %d not available **\n",drive);
                return FALSE;
        }
        if((pCMD->flags&(0x10<<drive))==0) {
                /* no disk inserted */
                printf("\n** No disk inserted in drive %d **\n",drive);
                return FALSE;
        }
        /* ok, we have a valid source */
        pCMD->drive=drive;

        /* read first block */
        pCMD->blnr=0;
        return TRUE;
}
/**************************************************************************
* int fdc_fdos_seek
* parameter is a block number
*/
int fdc_fdos_seek (int where)
{
        FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
        FDC_COMMAND_STRUCT *pCMD = &cmd;

        pCMD -> blnr = where ;
        return (fdc_seek (pCMD, pFG));
}
/**************************************************************************
* int fdc_fdos_read
*  the length is in block number
*/
int fdc_fdos_read (void *buffer, int len)
{
        FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
        FDC_COMMAND_STRUCT *pCMD = &cmd;

        return (fdc_read_data (buffer, len, pCMD, pFG));
}
#endif

#if defined(CONFIG_CMD_FDC)
/****************************************************************************
 * main routine do_fdcboot
 */
int do_fdcboot (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
        FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
        FDC_COMMAND_STRUCT *pCMD = &cmd;
        unsigned long addr,imsize;
        image_header_t *hdr;  /* used for fdc boot */
        unsigned char boot_drive;
        int i,nrofblk;
#if defined(CONFIG_FIT)
        const void *fit_hdr = NULL;
#endif

        switch (argc) {
        case 1:
                addr = CONFIG_SYS_LOAD_ADDR;
                boot_drive=CONFIG_SYS_FDC_DRIVE_NUMBER;
                break;
        case 2:
                addr = simple_strtoul(argv[1], NULL, 16);
                boot_drive=CONFIG_SYS_FDC_DRIVE_NUMBER;
                break;
        case 3:
                addr = simple_strtoul(argv[1], NULL, 16);
                boot_drive=simple_strtoul(argv[2], NULL, 10);
                break;
        default:
                return cmd_usage(cmdtp);
        }
        /* setup FDC and scan for drives  */
        if(fdc_setup(boot_drive,pCMD,pFG)==FALSE) {
                printf("\n** Error in setup FDC **\n");
                return 1;
        }
        if(fdc_check_drive(pCMD,pFG)==FALSE) {
                printf("\n** Error in check_drives **\n");
                return 1;
        }
        if((pCMD->flags&(1<<boot_drive))==0) {
                /* drive not available */
                printf("\n** Drive %d not availabe **\n",boot_drive);
                return 1;
        }
        if((pCMD->flags&(0x10<<boot_drive))==0) {
                /* no disk inserted */
                printf("\n** No disk inserted in drive %d **\n",boot_drive);
                return 1;
        }
        /* ok, we have a valid source */
        pCMD->drive=boot_drive;
        /* read first block */
        pCMD->blnr=0;
        if(fdc_read_data((unsigned char *)addr,1,pCMD,pFG)==FALSE) {
                printf("\nRead error:");
                for(i=0;i<7;i++)
                        printf("result%d: 0x%02X\n",i,pCMD->result[i]);
                return 1;
        }

        switch (genimg_get_format ((void *)addr)) {
        case IMAGE_FORMAT_LEGACY:
                hdr = (image_header_t *)addr;
                image_print_contents (hdr);

                imsize = image_get_image_size (hdr);
                break;
#if defined(CONFIG_FIT)
        case IMAGE_FORMAT_FIT:
                fit_hdr = (const void *)addr;
                puts ("Fit image detected...\n");

                imsize = fit_get_size (fit_hdr);
                break;
#endif
        default:
                puts ("** Unknown image type\n");
                return 1;
        }

        nrofblk=imsize/512;
        if((imsize%512)>0)
                nrofblk++;
        printf("Loading %ld Bytes (%d blocks) at 0x%08lx..\n",imsize,nrofblk,addr);
        pCMD->blnr=0;
        if(fdc_read_data((unsigned char *)addr,nrofblk,pCMD,pFG)==FALSE) {
                /* read image block */
                printf("\nRead error:");
                for(i=0;i<7;i++)
                        printf("result%d: 0x%02X\n",i,pCMD->result[i]);
                return 1;
        }
        printf("OK %ld Bytes loaded.\n",imsize);

        flush_cache (addr, imsize);

#if defined(CONFIG_FIT)
        /* This cannot be done earlier, we need complete FIT image in RAM first */
        if (genimg_get_format ((void *)addr) == IMAGE_FORMAT_FIT) {
                if (!fit_check_format (fit_hdr)) {
                        puts ("** Bad FIT image format\n");
                        return 1;
                }
                fit_print_contents (fit_hdr);
        }
#endif

        /* Loading ok, update default load address */
        load_addr = addr;

        return bootm_maybe_autostart(cmdtp, argv[0]);
}

U_BOOT_CMD(
        fdcboot,        3,      1,      do_fdcboot,
        "boot from floppy device",
        "loadAddr drive"
);
#endif