/* flashpic8.c:   This file contains the 8-bit flash-support code that is relocated to   RAM prior to execution.*/#include "config.h"#if INCLUDE_FLASH#include "stddefs.h"#include "cpu.h"#include "flashdev.h"#include "flash.h"#include "flash8.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. */intFlasherase29F040_8(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.                 * DQ5 timeout: if DQ7 is 0, and DQ5 == 1, timeout.                 */                for (;;) {                    if (Is_ff(add)) {                        break;                    }                    if (D5_Timeout(add)) {                        if (D7_not_set(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. */voidEndFlasherase29F040_8(){}/* Flashwrite():   Return 0 if successful, else -1.*/intFlashwrite29F040_8(fdev,dest,src,bytecnt)struct  flashinfo *fdev;uchar   *src, *dest;long    bytecnt;{    int     i, jj, 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;        Flashwrite29F040_8(fdev,dest-1,buf,2);        dest++; src++; bytecnt--;    }    /* Each pass through this loop writes 'fdev->width' bytes... */    ret = 0;    cnt = bytecnt & ~(fdev->width - 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... */        for (jj = 0; jj < fdev->width; jj++) {            src1[jj] = src[jj];        }        /* Write the value */        Fwrite(dest,src1);        /* Wait for write to complete or timeout. */        while(1) {            if (Is_D7_Equal(dest,src1)) {                break;            }            /* Check D5 for timeout... */            if (D5_Timeout(dest)) {                if (Is_D7_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 and width > 1, 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. */voidEndFlashwrite29F040_8(){}/* 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. */intFlashewrite29F040_8(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-1)) < (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)) {                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)) {                if (D7_not_set(add)) {                    /* Read/reset command: */                    Write_f0_to_555();                    val = Read_5555();                    reset = RESETFUNC();                    reset();                    break;                }            }        }        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_D7_Equal(dest,src)) {                break;            }            /* Check D5 for timeout... */            if (D5_Timeout(dest)) {                if (Is_D7_Not_Equal(dest,src)) {                    /* Read/reset command: */                    Write_f0_to_555();                    val = Read_5555();                    return(-1);                }            }        }        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. */voidEndFlashewrite29F040_8(){}/* Flashtype(): *  Use the AUTOSELECT command sequence to determine the type of device. */intFlashtype29F040_8(fdev)struct flashinfo *fdev;{    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.*/voidEndFlashtype29F040_8(){}#endif