/* flashpic.c:   This file contains the flash-support code that is relocated to   RAM prior to execution.  This file supports all bus widths, dependent   on the definition of WIDTH8, WIDTH16, or WIDTH32 on the command line.   Refer to flash.h for definition of the width-dependent macros.*/#include "config.h"#include "cpu.h"#include "flash.h"#include "flashdev.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;extern struct flashinfo Fdev;extern int FlashProtectWindow;/* Flasherase():   Based on the 'snum' value, erase the appropriate sector(s).   Return 0 if success, else -1.*/intFLASHERASE(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)) {            /* Issue the sector erase command sequence: */            Write_aa_to_5555();            Write_55_to_2aaa();            Write_80_to_5555();            Write_aa_to_5555();            Write_55_to_2aaa();            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_aa_to_5555();        Write_55_to_2aaa();        Write_f0_to_5555();        val = Read_5555();    }    return(ret);}/* EndFlasherase():   Function place holder to determine the "end" of the   sectorerase() function.*/voidENDFLASHERASE(){}/* Flashwrite():   Return 0 if successful, else -1.   Note: this assumes that source & destination properly aligned   based on the width of the flash bank.*/intFLASHWRITE(struct flashinfo *fdev,ftype *dest,ftype *src,long bytecnt){    int i, ret;    ftype   val;    /* Each pass through this loop writes 'fdev->width' bytes... */    ret = 0;    for (i=0;i<bytecnt;i+=fdev->width) {        /* Flash write command */        Write_aa_to_5555();        Write_55_to_2aaa();        Write_a0_to_5555();        /* Write the value */        Fwrite(dest,src);        /* Wait for write to complete or timeout. */        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))                    ret = -1;                goto done;            }        }        dest++; src++;    }done:    /* Read/reset command: */    Write_aa_to_5555();    Write_55_to_2aaa();    Write_f0_to_5555();    val = Read_5555();    return(ret);}/* EndFlashwrite():    Function place holder to determine the "end" of the    Flashwrite() function.*/voidENDFLASHWRITE(){}/* 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.*/intFLASHEWRITE(struct flashinfo *fdev,ftype *dest,ftype *src,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_5555();        Write_55_to_2aaa();        Write_80_to_5555();        Write_aa_to_5555();        Write_55_to_2aaa();        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 = (void(*)())(*(ulong *)RESET);                reset();            }        }        add += fdev->sectors[i].size;    }    /* Read/reset command: */    Write_aa_to_5555();    Write_55_to_2aaa();    Write_f0_to_5555();    val = Read_5555();    for(i=0;i<bytecnt;i+=fdev->width) {        /* Write command: */        Write_aa_to_5555();        Write_55_to_2aaa();        Write_a0_to_5555();        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_aa_to_5555();    Write_55_to_2aaa();    Write_f0_to_5555();    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 = (void(*)())(*(ulong *)RESET);    reset();    return(0);  /* won't get here */}/* EndFlashewrite():    Function place holder to determine the "end" of the    FlashEraseAndWrite() function.*/voidENDFLASHEWRITE(){}/* Flashtype():   Use the AUTOSELECT command sequence to determine the type of device.   Note: there is one additional step that I found necessary to keep   SGS29040 device happy... For some reason after issuing the read/reset   command and returning (to code that actually executes out of the FLASH   device) I was consistently getting an illegal opcode exception at   the return location in the flash.  It appears that the SGS part needs   a bit of time after the read/reset to be able to fetch an instruction.   Reading a value in the flash (stored in val) prior to issuing the   command sequence, then waiting for that read to be the same after    issuing the read/reset, assures the algorithm of not returning unless   the flash device is readable.  Note that I found this ONLY to be necessary   for the signature read command of SGS flash.*/intFLASHTYPE(struct flashinfo *fdev){    int i;    ftype   val;    ushort  man, dev;    val = Read_0000();    /* Issue the autoselect command sequence: */    Write_aa_to_5555();    Write_55_to_2aaa();    Write_90_to_5555();        man = (ushort)Read_0000();  /* manufacturer ID */    dev = (ushort)Read_0001();  /* device ID */    man &= 0xff;    dev &= 0xff;    man <<=8;    dev |= man;    fdev->id = (ushort)dev;    /* Issue the read/reset command sequence: */    Write_aa_to_5555();    Write_55_to_2aaa();    Write_f0_to_5555();    /* The SGS29040 seems to need this, and it doesn't hurt anything */    /* when using the AMD parts... */    for(i=0;i<FLASH_TIMEOUT;i++) {        if (val == Read_0000())            break;    }    return((int)(fdev->id));}/* EndFlashtype():    Function place holder to determine the "end" of the    Flashtype() function.*/voidENDFLASHTYPE(){}#endif