flashdev.c

完整的Bell实验室的嵌入式文件系统TFS

/* This file contains all of the flash support code that does not need
   to be relocated to RAM.  Two separate files (flash.c and flashpic.c)
   are maintained because under certain compilers, they may need to be
   compiled with different options to be made position independent.

   NOTE: THESE FUNCTIONS ARE NOT RE-ENTRANT!!!  All of the FLASH routines
   assume they can copy themselves into the array FlashFunc[]; hence, only
   one operation can be active at any time.
*/
#include "config.h"
#if INCLUDE_FLASH
#include "cpu.h"
#include "flashdev.h"
#include "flash.h"

typedef 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 int Flashtype16();
extern int EndFlashtype16();
extern int Flashwrite16();
extern int EndFlashwrite16();
extern int Flashewrite16();
extern int EndFlashewrite16();
extern int Flasherase16();
extern int EndFlasherase16();

/* FlashXXXFbuf[]:
   These arrays will contain the flash operation function that is executing.
   Recall that to operate on the flash, you cannot be executing out of it.
   The flash functions are copied here, then executed through the function
   pointer flashfunc which is set to point to FlashFunc.
*/
ulong    FlashTypeFbuf[FLASHFUNCSIZE];
ulong    FlashEraseFbuf[FLASHFUNCSIZE];
ulong    FlashWriteFbuf[FLASHFUNCSIZE];
ulong    FlashEwriteFbuf[FLASHFUNCSIZE];

extern int      FlashProtectWindow;
extern int      FlashCurrentBank;
extern struct   flashinfo FlashBank[FLASHBANKS];
extern int      flashopload();

/* FlashNamId[]:
   Used to correlate between the ID and a string representing the name
   of the flash device.
*/
struct flashdesc FlashNamId[] = {
        { AMD29F800B,   "AMD-29F800B" },
        { AMD29F800T,   "AMD-29F800T" },
        { 0, (char *)0 },
};

int SectorSizes800B[] = {
        0x4000, 0x2000, 0x2000, 0x8000,
        0x10000, 0x10000, 0x10000, 0x10000,
        0x10000, 0x10000, 0x10000, 0x10000,
        0x10000, 0x10000, 0x10000, 0x10000,
        0x10000, 0x10000, 0x10000
};

struct sectorinfo sinfo800[19];

/* FlashInit():
   Initialize data structures for each bank of flash...
*/
int
FlashInit()
{
    int i,  snum;
    uchar   *begin;
    long    size;
    struct  flashinfo *fbnk;

    snum = 0;
    FlashCurrentBank = 0;

    /* Copy functions to ram space... */
    /* Note that this MUST be done when cache is disabled to assure that */
    /* the RAM is occupied by the designated block of code. */

    if (flashopload((ulong *)FLASHTYPE,(ulong *)ENDFLASHTYPE,
        FlashTypeFbuf,sizeof(FlashTypeFbuf)) < 0)
        return(-1);
    if (flashopload((ulong *)FLASHERASE,(ulong *)ENDFLASHERASE,
        FlashEraseFbuf,sizeof(FlashEraseFbuf)) < 0)
        return(-1);
    if (flashopload((ulong *)FLASHEWRITE,(ulong *)ENDFLASHEWRITE,
        FlashEwriteFbuf,sizeof(FlashEwriteFbuf)) < 0)
        return(-1);
    if (flashopload((ulong *)FLASHWRITE,(ulong *)ENDFLASHWRITE,
        FlashWriteFbuf,sizeof(FlashWriteFbuf)) < 0)
        return(-1);

    fbnk = &FlashBank[0];
    fbnk->id = AMD29F800B;
    fbnk->base = (unsigned char *)FLASH_BANK0_BASE_ADDR;
    fbnk->end = fbnk->base + 0xfffff;           /* End address of bank. */
    fbnk->sectorcnt = 19;
    fbnk->width = FLASH_BANK0_WIDTH;
    fbnk->fltype = (int(*)())FlashTypeFbuf;         /* flashtype(). */
    fbnk->flerase = (int(*)())FlashEraseFbuf;       /* flasherase(). */
    fbnk->flwrite = (int(*)())FlashWriteFbuf;       /* flashwrite(). */
    fbnk->flewrite = (int(*)())FlashEwriteFbuf;     /* flashewrite(). */
    fbnk->sectors = sinfo800;

    begin = fbnk->base;
    for(i=0;i<fbnk->sectorcnt;i++,snum++) {
        int ssize;

        ssize = SectorSizes800B[i];
        fbnk->sectors[i].snum = snum;
        fbnk->sectors[i].size = ssize;
        fbnk->sectors[i].begin = begin;
        fbnk->sectors[i].end = fbnk->sectors[i].begin + ssize- 1;
        fbnk->sectors[i].protected = 0;
        begin += ssize;
    }

    /* Assume monitor resides in bank0 and that it uses the first 128K */
    /* of code space (actually it uses much less, but different options */
    /* within the monitor are configurable, so assume worst case). */
    /* These "monitor-owned" sectors should be marked as protected. */
    size = 0;
    for (i=0;((i<fbnk->sectorcnt)&(size<FLASH_PROTECT_SIZE));i++) {
        fbnk->sectors[i].snum = i;
        fbnk->sectors[i].protected = 1;
        size += fbnk->sectors[i].size;
    }
    /* Additional flash memory banks would be initialized here... */
    return(0);
}

#endif