/* flashpic.c:   This file contains the flash-support code that is relocated to   RAM prior to execution.*/#include "config.h"#if INCLUDE_FLASHtypedef unsigned char uchar;typedef unsigned short ushort;typedef unsigned long ulong;typedef volatile unsigned char vuchar;typedef volatile unsigned short vushort;typedef volatile unsigned long vulong;typedef volatile unsigned int vuint;typedef volatile int vint;#include "cpu.h"#include "flash.h"#include "flash16.h"extern struct flashinfo Fdev;extern int FlashProtectWindow;/* Flasherase():   Based on the 'snum' value, erase the appropriate sector(s).   Return 0 if success, else -1.*/Flasherase29F800B_16(fdev,snum)struct  flashinfo *fdev;int snum;{    ftype   val;    ulong   add;    int ret, sector;    ret = 0;    add = (ulong)(fdev->base);    /* Erase the request sector(s): */    for (sector=0;sector<fdev->sectorcnt;sector++) {        if ((!FlashProtectWindow) &&            (fdev->sectors[sector].protected)) {            add += fdev->sectors[sector].size;            continue;        }        if ((snum == ALL_SECTORS) || (snum == sector)) {            register ulong *lp, *lp1;            int noterased;            /* See if the sector is already erased: */            noterased = 0;            lp = (ulong *)fdev->sectors[sector].begin;             lp1 = (ulong *)((char *)lp + fdev->sectors[sector].size);             while(lp < lp1) {                if (*lp++ != 0xffffffff) {                    noterased = 1;                    break;                }            }            if (noterased) {                /* Issue the sector erase command sequence: */                Write_aa_to_555();                Write_55_to_2aa();                Write_80_to_555();                Write_aa_to_555();                Write_55_to_2aa();                Write_30_to_(add);                /* Wait for sector erase to complete or timeout.. */                /* DQ7 polling: wait for D7 to be 1. */                /* DQ6 toggling: wait for D6 to not toggle. */                /* DQ5 timeout: if DQ7 is 0, and DQ5 = 1, timeout. */                while(1) {                    if (Is_ff(add)) {                        if (Is_ff(add))                            break;                    }                    if (D5_Timeout(add)) {                        if (Is_not_ff(add))                            ret = -1;                        break;                    }                }            }        }        add += fdev->sectors[sector].size;    }    /* If the erase failed for some reason, then issue the read/reset */    /* command sequence prior to returning... */    if (ret == -1) {        Write_f0_to_555();        val = Read_5555();    }    return(ret);}/* EndFlasherase():   Function place holder to determine the "end" of the   sectorerase() function.*/voidEndFlasherase29F800B_16(){}/* Flashwrite():   Return 0 if successful, else -1.*/Flashwrite29F800B_16(fdev,dest,src,bytecnt)struct  flashinfo *fdev;uchar   *src, *dest;long    bytecnt;{    int     i, ret;    long    cnt;    uchar   *src1;    ftype   val;    /* If destination address is not properly aligned, then build a fake   */    /* source buffer based on the current value in dest[-1] and src[0].    */    /* Then call this function to do that 2-byte operation.  Once that     */    /* completes, simply increment dest and src by 1 and continue in this  */    /* context. */    if (NotAligned(dest)) {        uchar buf[2];        buf[0] = *(dest-1);        buf[1] = *src;        Flashwrite29F800B_16(fdev,dest-1,buf,2);        dest++; src++; bytecnt--;    }    /* Each pass through this loop writes 'fdev->width' bytes... */    ret = 0;    cnt = bytecnt & ~1;    src1 = (uchar *)&val;onemore:    for (i=0;i<cnt;i+=fdev->width) {        /* Flash write command */        Write_aa_to_555();        Write_55_to_2aa();        Write_a0_to_555();                /* Just in case src is not aligned... */        src1[0] = src[0];        src1[1] = src[1];        /* Write the value */        Fwrite(dest,src1);        /* Wait for write to complete or timeout. */        while(1) {            if (Is_Equal(dest,src1)) {                if (Is_Equal(dest,src1))                    break;            }            /* Check D5 for timeout... */            if (D5_Timeout(dest)) {                if (Is_Not_Equal(dest,src1))                    ret = -1;                goto done;            }        }        dest += fdev->width;         src += fdev->width;    }    /* If bytecount was odd... */    /* If cnt != bytecnt then bytecnt is odd, so one more byte must be */    /* written to flash.  To do this, the one byte must be combined with */    /* the next byte that is already stored in flash; then re-written... */    if (cnt != bytecnt) {        val = (ftype)*dest | ((ftype)(*src) << 8);        src = (uchar *)&val;        bytecnt = cnt = 1;        goto onemore;    }done:    /* Read/reset command: */    Write_f0_to_555();    val = Read_5555();    return(ret);}/* EndFlashwrite():    Function place holder to determine the "end" of the    Flashwrite() function.*/voidEndFlashwrite29F800B_16(){}/* Ewrite():   Erase all sectors that are part of the address space to be written,   then write the data to that address space.  This is basically a   concatenation of flasherase and flashwrite done in one step.  This is   necessary primarily for re-writing the bootcode; because after the boot   code is erased, there is nowhere to return so the re-write must be done   while executing out of ram also.*/Flashewrite29F800B_16(fdev,dest,src,bytecnt)struct  flashinfo *fdev;ftype   *src, *dest;int bytecnt;{    int i;    ulong   add;    void    (*reset)();    ftype   val, *src1, *dest1;    add = (ulong)(fdev->base);    src1 = src;    dest1 = dest;    /* For each sector, if it overlaps any of the destination space */    /* then erase that sector. */    for (i=0;i<fdev->sectorcnt;i++) {        if ((((uchar *)dest) > (fdev->sectors[i].end)) ||            (((uchar *)dest+bytecnt) < (fdev->sectors[i].begin))) {            add += fdev->sectors[i].size;            continue;        }        /* Sector erase command: */        Write_aa_to_555();        Write_55_to_2aa();        Write_80_to_555();        Write_aa_to_555();        Write_55_to_2aa();        Write_30_to_(add);        /* Wait for sector erase to complete or timeout.. */        /* DQ7 polling: wait for D7 to be 1. */        /* DQ6 toggling: wait for D6 to not toggle. */        /* DQ5 timeout: if DQ7 is 0, and DQ5 = 1, timeout. */        while(1) {            if (Is_ff(add)) {                if (Is_ff(add))                    break;            }            /* Check D5 for timeout... */            /* In this case, there is nothing to return to */            /* because the flash was just erased, so just break.*/            if (D5_Timeout(add)) {                reset = RESETFUNC();                reset();            }        }        add += fdev->sectors[i].size;    }    /* Read/reset command: */    Write_f0_to_555();    val = Read_5555();    for(i=0;i<bytecnt;i+=fdev->width) {        /* Write command: */        Write_aa_to_555();        Write_55_to_2aa();        Write_a0_to_555();        Fwrite(dest,src);        while(1) {            if (Is_Equal(dest,src)) {                if (Is_Equal(dest,src))                    break;            }            /* Check D5 for timeout... */            if (D5_Timeout(dest)) {                if (Is_Not_Equal(dest,src))                    return(-1);                break;            }        }        dest++;         src++;    }    /* Issue the read/reset command sequence: */    Write_f0_to_555();    val = Read_5555();    /* Wait till flash is readable, or timeout: */    for(i=0;i<FLASH_TIMEOUT;i++) {        if (Is_Equal(dest1,src1))            break;    }    /* Now that the re-programming of flash is complete, reset: */    reset = RESETFUNC();    reset();    return(0);  /* won't get here */}/* EndFlashewrite():    Function place holder to determine the "end" of the    FlashEraseAndWrite() function.*/voidEndFlashewrite29F800B_16(){}/* Flashtype():   Use the AUTOSELECT command sequence to determine the type of device.*/intFlashtype29F800B_16(fdev)struct flashinfo *fdev;{    int i;    ftype   val;    ushort  man, dev;    ulong   id;    val = Read_0000();    /* Issue the autoselect command sequence: */    Write_aa_to_555();    Write_55_to_2aa();    Write_90_to_555();    man = (ushort)Read_0000();  /* manufacturer ID */    dev = (ushort)Read_0001();  /* device ID */    id = man;    id <<= 16;    id |= dev;    fdev->id = id;    /* Issue the read/reset command sequence: */    Write_f0_to_555();    val = Read_0000();    return((int)(fdev->id));}/* EndFlashtype():    Function place holder to determine the "end" of the    Flashtype() function.*/voidEndFlashtype29F800B_16(){}#endif