flash.c

该源码为mpc8248处理器的BSP

		break;				/* => 128 MBit		*/

	default:
		info->flash_id = FLASH_ID_UNKNOWN;
		addr[0] = FLASH_CMD_RESET;	/* restore read mode */
		return (0);			/* => no or unknown flash */

	}

	if (info->sector_count > CFG_MAX_FLASH_SECT) {
		printf ("** ERROR: sector count %d > max (%d) **\n",
			info->sector_count, CFG_MAX_FLASH_SECT);
		info->sector_count = CFG_MAX_FLASH_SECT;
	}

	addr[0] = FLASH_CMD_RESET;		/* restore read mode */

	return (info->size);
}


/*
 * Erase unprotected sectors
 */

int flash_erase (flash_info_t *info, int s_first, int s_last)
{
	int flag, prot, sect;
	unsigned long start, now, last;

       if(0xacce !=flash_init_flag)
            flash_init();


	if ((s_first < 0) || (s_first > s_last)) {
		if (info->flash_id == FLASH_ID_UNKNOWN) {
			printf ("- missing\n");
		} else {
			printf ("- no sectors to erase\n");
		}
		return 1;
	}

	if ((info->flash_id & FLASH_VENDMASK) != FLASH_MAN_INTEL) {
		printf ("Can erase only Intel flash types - aborted\n");
		return 1;
	}

	prot = 0;
	for (sect=s_first; sect<=s_last; ++sect) {
		if (info->protect[sect]) {
			prot++;
		}
	}

	if (prot) {
		printf ("- Warning: %d protected sectors will not be erased!\n",
			prot);
	} else {
		printf ("\n");
	}

	start = POLL_TIME*10000;
	last  = start;

	/* Start erase on unprotected sectors */
	for (sect = s_first; sect<=s_last; sect++) {
		if (info->protect[sect] == 0) {	/* not protected */
			volatile unsigned short *addr = (volatile unsigned short *)(info->start[sect]);
			unsigned long status;

			/* Disable interrupts which might cause a timeout here */
			flag = disable_interrupts();

#ifdef DEBUG
			printf("Erase sector %d at start addr 0x%08X", sect, (unsigned int)info->start[sect]);
#endif

			*addr = FLASH_CMD_CLEAR_STATUS;
			*addr = FLASH_CMD_BLOCK_ERASE;
			*addr = FLASH_CMD_ERASE_CONFIRM;

			/* re-enable interrupts if necessary */
			if (flag)
				enable_interrupts();

			/* wait at least 80us - let's wait 1 ms */
			taskDelay (1);
                            DelayTime(DELAY_TIME*10000);

			while (((status = *addr) & FLASH_STATUS_DONE) != FLASH_STATUS_DONE) {
                            DelayTime(DELAY_TIME*10000);

                            if (start--==0) {
					printf("Flash erase timeout at address %lx\n", info->start[sect]);
					*addr = FLASH_CMD_SUSPEND_ERASE;
					*addr = FLASH_CMD_RESET;
					return 1;
				}

#if 0
				/* show that we're waiting */
				if ((now - last) > 1000) {	/* every second */
					putc ('.');
					last = now;
				}
#endif
			}
			*addr = FLASH_CMD_RESET;
		}
	}
#ifdef DEBUG
	printf (" done\n");
#endif
	return 0;
}

/*
 * Copy memory to flash, returns:
 * 0 - OK
 * 1 - write timeout
 * 2 - Flash not erased
 * 4 - Flash not identified
 */

int write_buff (flash_info_t *info, unsigned char *src, unsigned long addr, unsigned long cnt)
{
	unsigned long cp, wp;
	unsigned short data;
	int i, rc;


	if (info->flash_id == FLASH_ID_UNKNOWN) {
		return 4;
	}

	wp = (addr & ~1);	/* get lower word aligned address */

	/*
	 * handle unaligned start byte
	 */

	if (addr - wp) {
		data = 0;
		data = (data << 8) | *src++;
		--cnt;
		if ((rc = write_short(info, wp, data)) != 0) {
			return (rc);
		}
		wp += 2;
	}

	/*
	 * handle word aligned part
	 */

	while (cnt >= 2) {
		data = 0;
		for (i=0; i<2; ++i) {
			data = (data << 8) | *src++;
		}

		if ((rc = write_short(info, wp, data)) != 0) {
			return (rc);
		}
		wp  += 2;
		cnt -= 2;
	}

	if (cnt == 0) {
		return (0);
	}

	/*
	 * handle unaligned tail bytes
	 */

	data = 0;
	for (i=0, cp=wp; i<2 && cnt>0; ++i, ++cp) {
		data = (data << 8) | *src++;
		--cnt;
	}
	for (; i<2; ++i, ++cp) {
		data = (data << 8) | (*(unsigned char *)cp);
	}

	return (write_short(info, wp, data));

}

/*
 * Write 16 bit (short) to flash
 */

static int write_short (flash_info_t *info, unsigned long dest, unsigned short data)
{
	volatile unsigned short *addr = (volatile unsigned short*)(info->start[0]);
	unsigned long start;
	int flag;

	/* Check if Flash is (sufficiently) erased */
	if ((*((volatile unsigned short *)dest) & data) != data) {
		return (2);
	}

	/* Disable interrupts which might cause a timeout here */
	flag = disable_interrupts();

	if (!(info->flash_id & FLASH_VENDMASK)) {
		return 4;
	}
	*addr = FLASH_CMD_ERASE_CONFIRM;
	*addr = FLASH_CMD_WRITE;

	*((volatile unsigned short *)dest) = data;

	/* re-enable interrupts if necessary */
	if (flag) {
		enable_interrupts();
	}

	/* data polling for D7 */
	start = POLL_TIME;

	/* wait for error or finish */
	while(!(addr[0] & FLASH_STATUS_DONE)){
               DelayTime(DELAY_TIME);
		if (start--==0) {
			addr[0] = FLASH_CMD_RESET;
			return (1);
		}
	}

	*addr = FLASH_CMD_RESET;
	return (0);
}

/*
 * Protects a flash sector
 */

int flash_real_protect(flash_info_t *info, long sector, int prot)
{
	volatile unsigned short *addr = (volatile unsigned short*)(info->start[sector]);
	unsigned long start;

	*addr = FLASH_CMD_CLEAR_STATUS;
	*addr = FLASH_CMD_PROTECT;

	if(prot) {
		*addr = FLASH_CMD_PROTECT_SET;
	} else {
		*addr = FLASH_CMD_PROTECT_CLEAR;
	}
#ifdef DEBUG
    printf("flash_real_protect %s %d sector \n",prot?"set":"clear",sector);
#endif
	/* wait for error or finish */
	start = POLL_TIME;
               DelayTime(DELAY_TIME*10000);
	while(!(addr[0] & FLASH_STATUS_DONE)){
               DelayTime(DELAY_TIME*10000);

		if (start--==0) {
			printf("Flash protect timeout at address %lx\n",  info->start[sector]);
			addr[0] = FLASH_CMD_RESET;
			return (1);
		}
	}
	/* Set software protect flag */
	info->protect[sector] = prot;
	*addr = FLASH_CMD_RESET;
	return (0);
}



void ShowFlash(void)
{
    if(0xacce !=flash_init_flag)
        flash_init();
    flash_print_info(flash_info);
}


/*
自己调用擦除，如果没有检测flash就自己调用检测flash

cnt:写入大小是byte
return:返回0 正常,其余错误

*/

int ctdb_flash_write(unsigned char *src, unsigned long dst, unsigned long cnt)
{
    unsigned int s_first=0xffffffff;
    unsigned int s_last=0xffffffff;
    int i;
    flash_info_t *info=flash_info;

       if(0xacce !=flash_init_flag)
            flash_init();

	    for (i = 0; i < info->sector_count-1; i++) {
              if((info->start[i] <=(unsigned long)dst)&&(info->start[i+1] >(unsigned long)dst))
                s_first=i;
		if((info->start[i] <(unsigned long)(dst+cnt))&&(info->start[i+1] >=(unsigned long)(dst+cnt)))
		{
                s_last=i;
                break;
		}
	    }
        
    if((s_first==0xffffffff)||(s_last==0xffffffff))
        return 9;
/*
    printf("erase star =%d end=%d\n",s_first,s_last);
*/
    for(i=s_first;i<=s_last;i++)
        flash_real_protect(flash_info,i,0);

    
    i=flash_erase(flash_info,s_first,s_last);
    if(0!=i)
        return i;
        

    return write_buff(flash_info,src,dst,cnt);
}