flash.c

AT91RM9200的完整启动代码：包括loader, boot及U-boot三部分均已编译通过！欢迎下载使用！

    int prot = 0;

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

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

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

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

            *addr = 0x00500050;              /* clear status register */
            *addr = 0x00200020;              /* erase setup */
            *addr = 0x00D000D0;              /* erase confirm */

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

            /* Wait at least 80us - let's wait 1 ms */
            udelay (1000);

            while (((status = *addr) & 0x00800080) != 0x00800080) {
                if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
                    printf ("Timeout\n");
                    *addr = 0x00B000B0;      /* suspend erase      */
                    *addr = 0x00FF00FF;      /* reset to read mode */
                    return 1;
                }

                /* show that we're waiting */
                if ((now - last) > 990) {   /* every second */
                    putc ('.');
                    last = now;
                }
            }
            *addr = 0x00FF00FF;              /* reset to read mode */
        }
    }
    printf (" done\n");
    return 0;
} /* end flash_erase32() */

int flash_erase(flash_info_t *info, int s_first, int s_last)
{
    if ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM040)
        return flash_erase8(info, s_first, s_last);
    else
        return flash_erase32(info, s_first, s_last);
} /* end flash_erase() */

/*-----------------------------------------------------------------------
 * Copy memory to flash, returns:
 * 0 - OK
 * 1 - write timeout
 * 2 - Flash not erased
 */
static int write_buff8(flash_info_t *info, uchar *src, ulong addr, ulong cnt)
{
    ulong cp, wp, data;
    ulong start;
    int i, l, rc;

    start = get_timer (0);

    wp = (addr & ~3);                        /* get lower word
                                                aligned address */

    /*
     * handle unaligned start bytes
     */
    if ((l = addr - wp) != 0) {
        data = 0;
        for (i=0, cp=wp; i<l; ++i, ++cp) {
            data = (data << 8) | (*(uchar *)cp);
        }
        for (; i<4 && cnt>0; ++i) {
            data = (data << 8) | *src++;
            --cnt;
            ++cp;
        }
        for (; cnt==0 && i<4; ++i, ++cp) {
            data = (data << 8) | (*(uchar *)cp);
        }

        if ((rc = write_word8(info, wp, data)) != 0) {
            return (rc);
        }
        wp += 4;
    }

    /*
     * handle word aligned part
     */
    while (cnt >= 4) {
        data = 0;
        for (i=0; i<4; ++i) {
            data = (data << 8) | *src++;
        }
        if ((rc = write_word8(info, wp, data)) != 0) {
            return (rc);
        }
        wp  += 4;
        cnt -= 4;
        if (get_timer(start) > 1000) {   /* every second */
           WATCHDOG_RESET();
           putc ('.');
           start = get_timer(0);
        }
    }

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

    /*
     * handle unaligned tail bytes
     */
    data = 0;
    for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
        data = (data << 8) | *src++;
        --cnt;
    }
    for (; i<4; ++i, ++cp) {
        data = (data << 8) | (*(uchar *)cp);
    }

    return (write_word8(info, wp, data));
} /* end write_buff8() */

#define	FLASH_WIDTH	4	/* flash bus width in bytes */
static int write_buff32 (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
{
	ulong cp, wp, data;
	int i, l, rc;
	ulong start;

	start = get_timer (0);

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

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

	/*
	 * handle unaligned start bytes
	 */
	if ((l = addr - wp) != 0) {
		data = 0;
		for (i=0, cp=wp; i<l; ++i, ++cp) {
			data = (data << 8) | (*(uchar *)cp);
		}
		for (; i<FLASH_WIDTH && cnt>0; ++i) {
			data = (data << 8) | *src++;
			--cnt;
			++cp;
		}
		for (; cnt==0 && i<FLASH_WIDTH; ++i, ++cp) {
			data = (data << 8) | (*(uchar *)cp);
		}

		if ((rc = write_word32(info, wp, data)) != 0) {
			return (rc);
		}
		wp += FLASH_WIDTH;
	}

	/*
	 * handle FLASH_WIDTH aligned part
	 */
	while (cnt >= FLASH_WIDTH) {
		data = 0;
		for (i=0; i<FLASH_WIDTH; ++i) {
			data = (data << 8) | *src++;
		}
		if ((rc = write_word32(info, wp, data)) != 0) {
			return (rc);
		}
		wp  += FLASH_WIDTH;
		cnt -= FLASH_WIDTH;
          if (get_timer(start) > 990) {   /* every second */
			putc ('.');
			start = get_timer(0);
		}
	}

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

	/*
	 * handle unaligned tail bytes
	 */
	data = 0;
	for (i=0, cp=wp; i<FLASH_WIDTH && cnt>0; ++i, ++cp) {
		data = (data << 8) | *src++;
		--cnt;
	}
	for (; i<FLASH_WIDTH; ++i, ++cp) {
		data = (data << 8) | (*(uchar *)cp);
	}

	return (write_word32(info, wp, data));
} /* write_buff32() */

int write_buff(flash_info_t *info, uchar *src, ulong addr, ulong cnt)
{
    int retval;

    if ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM040)
        retval = write_buff8(info, src, addr, cnt);
    else
        retval = write_buff32(info, src, addr, cnt);

    return retval;
} /* end write_buff() */

/*-----------------------------------------------------------------------
 * Write a word to Flash, returns:
 * 0 - OK
 * 1 - write timeout
 * 2 - Flash not erased
 */

static int write_word8(flash_info_t *info, ulong dest, ulong data)
{
    volatile uchar *addr2 = (uchar *)(info->start[0]);
    volatile uchar *dest2 = (uchar *)dest;
    volatile uchar *data2 = (uchar *)&data;
    int flag;
    int i, tcode, rcode = 0;

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

    for (i=0; i < (4 / sizeof(uchar)); i++) {
        /* Disable interrupts which might cause a timeout here */
        flag = disable_interrupts();

        *(addr2 + 0x555) = (uchar)0xAA;
        *(addr2 + 0x2aa) = (uchar)0x55;
        *(addr2 + 0x555) = (uchar)0xA0;

        dest2[i] = data2[i];

        /* Wait for write to complete, up to 1ms */
        tcode = wait_for_DQ7((ulong)&dest2[i], data2[i], 1);

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

        /* Make sure we didn't timeout */
        if (tcode) {
            rcode = 1;
        }
    }

    return rcode;
} /* end write_word8() */

static int write_word32(flash_info_t *info, ulong dest, ulong data)
{
    vu_long *addr = (vu_long *)dest;
    ulong status;
    ulong start;
    int flag;

    /* Check if Flash is (sufficiently) erased */
    if ((*addr & data) != data) {
        return (2);
    }
    /* Disable interrupts which might cause a timeout here */
    flag = disable_interrupts();

    *addr = 0x00400040;                      /* write setup */
    *addr = data;

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

    start = get_timer (0);

    while (((status = *addr) & 0x00800080) != 0x00800080) {
        WATCHDOG_RESET();
        if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
            *addr = 0x00FF00FF;              /* restore read mode */
            return (1);
        }
    }

    *addr = 0x00FF00FF;                      /* restore read mode */

    return (0);
} /* end write_word32() */


static int _flash_protect(flash_info_t *info, long sector)
{
    int i;
    int flag;
    ulong status;
    int rcode = 0;
    volatile long *addr = (unsigned long *)sector;

    switch(info->flash_id & FLASH_TYPEMASK) {
        case FLASH_28F320J3A:
        case FLASH_28F640J3A:
        case FLASH_28F128J3A:
            /* Disable interrupts which might cause Flash to timeout */
            flag = disable_interrupts();

            /* Issue command */
            *addr = 0x00500050L;             /* Clear the status register */
            *addr = 0x00600060L;             /* Set lock bit setup */
            *addr = 0x00010001L;             /* Set lock bit confirm */

            /* Wait for command completion */
            for (i = 0; i < 10; i++) {       /* 75us timeout, wait 100us */
                udelay(10);
                if ((*addr & 0x00800080L) == 0x00800080L)
                    break;
            }

            /* Not successful? */
            status = *addr;
            if (status != 0x00800080L) {
                printf("Protect %x sector failed: %x\n",
                       (uint)sector, (uint)status);
                rcode = 1;
            }

            /* Restore read mode */
            *addr = 0x00ff00ffL;

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

            break;
        case FLASH_AM040:                    /* No soft sector protection */
            break;
    }

    /* Turn protection on for this sector */
    for (i = 0; i < info->sector_count; i++) {
        if (info->start[i] == sector) {
            info->protect[i] = 1;
            break;
        }
    }

    return rcode;
} /* end _flash_protect() */

static int _flash_unprotect(flash_info_t *info, long sector)
{
    int i;
    int flag;
    ulong status;
    int rcode = 0;
    volatile long *addr = (unsigned long *)sector;

    switch(info->flash_id & FLASH_TYPEMASK) {
        case FLASH_28F320J3A:
        case FLASH_28F640J3A:
        case FLASH_28F128J3A:
            /* Disable interrupts which might cause Flash to timeout */
            flag = disable_interrupts();

            *addr = 0x00500050L;             /* Clear the status register */
            *addr = 0x00600060L;             /* Clear lock bit setup */
            *addr = 0x00D000D0L;             /* Clear lock bit confirm */

            /* Wait for command completion */
            for (i = 0; i < 80 ; i++) {      /* 700ms timeout, wait 800 */
                udelay(10000);               /* Delay 10ms */
                if ((*addr & 0x00800080L) == 0x00800080L)
                    break;
            }

            /* Not successful? */
            status = *addr;
            if (status != 0x00800080L) {
                printf("Un-protect %x sector failed: %x\n",
                       (uint)sector, (uint)status);
                *addr = 0x00ff00ffL;
                rcode = 1;
            }

            /* restore read mode */
            *addr = 0x00ff00ffL;

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

            break;
        case FLASH_AM040:                    /* No soft sector protection */
            break;
    }

    /*
     * Fix Intel's little red wagon.  Reprotect
     * sectors that were protected before we undid
     * protection on a specific sector.
     */
    for (i = 0; i < info->sector_count; i++) {
        if (info->start[i] != sector) {
            if (info->protect[i]) {
                if (_flash_protect(info, info->start[i]))
                    rcode = 1;
	    }
        }
        else /* Turn protection off for this sector */
            info->protect[i] = 0;
    }

    return rcode;
} /* end _flash_unprotect() */


int flash_real_protect(flash_info_t *info, long sector, int prot)
{
    int rcode;

    if (prot)
        rcode = _flash_protect(info, info->start[sector]);
    else
        rcode = _flash_unprotect(info, info->start[sector]);

    return rcode;
} /* end flash_real_protect() */

/*-----------------------------------------------------------------------
 */