[people/ms/u-boot.git] / board / eltec / elppc / flash.c

/*
 * (C) Copyright 2000
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

/*
 * 07-10-2002 Frank Gottschling: added 29F032 flash (ELPPC).
 *        fixed monitor protection part
 *
 * 09-18-2001 Andreas Heppel: Reduced the code in here to the usage
 *        of AMD's 29F040 and 29F016 flashes, since the BAB7xx does use
 *        any other.
 */

#include <common.h>
#include <asm/processor.h>
#include <asm/pci_io.h>

flash_info_t    flash_info[CONFIG_SYS_MAX_FLASH_BANKS]; /* info for FLASH chips */

ulong flash_get_size (vu_long *addr, flash_info_t *info);
static int write_word (flash_info_t *info, ulong dest, ulong data);

/*flash command address offsets*/

#define ADDR0           (0x555)
#define ADDR1           (0x2AA)
#define ADDR3           (0x001)

#define FLASH_WORD_SIZE unsigned char

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

unsigned long flash_init (void)
{
    unsigned long size1, size2;
    int i;

    /* Init: no FLASHes known */
    for (i=0; i<CONFIG_SYS_MAX_FLASH_BANKS; ++i)
    {
	flash_info[i].flash_id = FLASH_UNKNOWN;
    }

    /* initialise 1st flash */
    size1 = flash_get_size((vu_long *)FLASH_BASE0_PRELIM, &flash_info[0]);

    if (flash_info[0].flash_id == FLASH_UNKNOWN)
    {
	printf ("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
	    size1, size1<<20);
    }

    /* initialise 2nd flash */
    size2 = flash_get_size((vu_long *)FLASH_BASE1_PRELIM, &flash_info[1]);

    if (flash_info[1].flash_id == FLASH_UNKNOWN)
    {
	printf ("## Unknown FLASH on Bank 1 - Size = 0x%08lx = %ld MB\n",
	    size2, size2<<20);
    }

    /* monitor protection ON by default */
    if (size1 == 512*1024)
    {
	(void)flash_protect(FLAG_PROTECT_SET,
		FLASH_BASE0_PRELIM,
		FLASH_BASE0_PRELIM+monitor_flash_len-1,
		&flash_info[0]);
    }
    if (size2 == 512*1024)
    {
	(void)flash_protect(FLAG_PROTECT_SET,
		FLASH_BASE1_PRELIM,
		FLASH_BASE1_PRELIM+monitor_flash_len-1,
		&flash_info[1]);
    }
    if (size2 == 4*1024*1024)
    {
	(void)flash_protect(FLAG_PROTECT_SET,
		CONFIG_SYS_FLASH_BASE,
		CONFIG_SYS_FLASH_BASE+monitor_flash_len-1,
		&flash_info[1]);
    }

    return (size1 + size2);
}

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

void flash_print_info  (flash_info_t *info)
{
    int i;
    int k;
    int size;
    int erased;
    volatile unsigned long *flash;

    if (info->flash_id == FLASH_UNKNOWN) {
	printf ("missing or unknown FLASH type\n");
	flash_init();
    }

    if (info->flash_id == FLASH_UNKNOWN) {
	printf ("missing or unknown FLASH type\n");
	return;
    }

    switch (info->flash_id & FLASH_VENDMASK) {
    case FLASH_MAN_AMD:
	printf ("AMD ");
	break;
    default:
	printf ("Unknown Vendor ");
	break;
    }

    switch (info->flash_id & FLASH_TYPEMASK) {
    case AMD_ID_F040B:
	printf ("AM29F040B (4 Mbit)\n");
	break;
    case AMD_ID_F016D:
	printf ("AM29F016D (16 Mbit)\n");
	break;
    case AMD_ID_F032B:
	printf ("AM29F032B (32 Mbit)\n");
	break;
   default:
	printf ("Unknown Chip Type\n");
	break;
    }

    if (info->size >= (1 << 20)) {
	printf ("  Size: %ld MB in %d Sectors\n", info->size >> 20, info->sector_count);
    } else {
	printf ("  Size: %ld kB in %d Sectors\n", info->size >> 10, info->sector_count);
    }

    printf ("  Sector Start Addresses:");
    for (i=0; i<info->sector_count; ++i) {
	/*
	* Check if whole sector is erased
	*/
	if (i != (info->sector_count-1))
	    size = info->start[i+1] - info->start[i];
	else
	    size = info->start[0] + info->size - info->start[i];

	erased = 1;
	flash = (volatile unsigned long *)info->start[i];
	size = size >> 2;        /* divide by 4 for longword access */
	for (k=0; k<size; k++) {
	    if (*flash++ != 0xffffffff) {
		erased = 0;
		break;
	    }
	}

	if ((i % 5) == 0)
	    printf ("\n   ");

	printf (" %08lX%s%s",
	    info->start[i],
	    erased ? " E" : "  ",
	    info->protect[i] ? "RO " : "   ");
    }
    printf ("\n");
}

/*----------------------------------------------------------------------------*/
/*
 * The following code cannot be run from FLASH!
 */
ulong flash_get_size (vu_long *addr, flash_info_t *info)
{
    short i;
    ulong vendor, devid;
    ulong base = (ulong)addr;
    volatile unsigned char *caddr = (unsigned char *)addr;

#ifdef DEBUG
    printf("flash_get_size for address 0x%lx: \n", (unsigned long)caddr);
#endif

    /* Write auto select command: read Manufacturer ID */
    caddr[0] = 0xF0;   /* reset bank */
    udelay(10);

    eieio();
    caddr[0x555] = 0xAA;
    udelay(10);
    caddr[0x2AA] = 0x55;
    udelay(10);
    caddr[0x555] = 0x90;

    udelay(10);

    vendor = caddr[0];
    devid = caddr[1];

#ifdef DEBUG
    printf("Manufacturer: 0x%lx\n", vendor);
#endif

    vendor &= 0xff;
    devid &= 0xff;

    /* We accept only two AMD types */
    switch (vendor) {
    case (FLASH_WORD_SIZE)AMD_MANUFACT:
	info->flash_id = FLASH_MAN_AMD;
	break;
    default:
	info->flash_id = FLASH_UNKNOWN;
	info->sector_count = 0;
	info->size = 0;
	return (0);         /* no or unknown flash  */
    }

    switch (devid) {
    case (FLASH_WORD_SIZE)AMD_ID_F040B:
	info->flash_id |= AMD_ID_F040B;
	info->sector_count = 8;
	info->size = 0x00080000;
	break;              /* => 0.5 MB      */

    case (FLASH_WORD_SIZE)AMD_ID_F016D:
	info->flash_id |= AMD_ID_F016D;
	info->sector_count = 32;
	info->size         = 0x00200000;
	break;              /* => 2 MB      */

    case (FLASH_WORD_SIZE)AMD_ID_F032B:
	info->flash_id |= AMD_ID_F032B;
	info->sector_count = 64;
	info->size         = 0x00400000;
	break;              /* => 4 MB      */

    default:
	info->flash_id = FLASH_UNKNOWN;
	return (0);         /* => no or unknown flash */

    }

#ifdef DEBUG
    printf("flash id 0x%lx; sector count 0x%x, size 0x%lx\n", info->flash_id, info->sector_count, info->size);
#endif

    /* check for protected sectors */
    for (i = 0; i < info->sector_count; i++) {
	/* sector base address */
	info->start[i] = base + i * (info->size / info->sector_count);
	/* read sector protection at sector address, (A7 .. A0) = 0x02 */
	/* D0 = 1 if protected */
	caddr = (volatile unsigned char *)(info->start[i]);
	info->protect[i] = caddr[2] & 1;
    }

    /*
     * Prevent writes to uninitialized FLASH.
     */
    if (info->flash_id != FLASH_UNKNOWN) {
	caddr = (volatile unsigned char *)info->start[0];
	caddr[0] = 0xF0;   /* reset bank */
    }

    return (info->size);
}

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

int flash_erase (flash_info_t *info, int s_first, int s_last)
{
    volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *)(info->start[0]);
    int flag, prot, sect, l_sect;
    ulong start, now, last;
    int rc = 0;

    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;
    }

    if ((info->flash_id == FLASH_UNKNOWN) ||
	(info->flash_id > FLASH_AMD_COMP)) {
	printf ("Can't erase unknown flash type - 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");
    }

    l_sect = -1;

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

    addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
    addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
    addr[ADDR0] = (FLASH_WORD_SIZE)0x00800080;
    addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
    addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;

    /* Start erase on unprotected sectors */
    for (sect = s_first; sect<=s_last; sect++) {
	if (info->protect[sect] == 0) { /* not protected */
	    addr = (FLASH_WORD_SIZE *)(info->start[sect]);
	    if (info->flash_id & FLASH_MAN_SST) {
		addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
		addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
		addr[ADDR0] = (FLASH_WORD_SIZE)0x00800080;
		addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
		addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
		addr[0] = (FLASH_WORD_SIZE)0x00500050;  /* block erase */
		udelay(30000);  /* wait 30 ms */
	    }
	    else
		addr[0] = (FLASH_WORD_SIZE)0x00300030;  /* sector erase */
	    l_sect = sect;
	}
    }

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

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

    /*
     * We wait for the last triggered sector
     */
    if (l_sect < 0)
	goto DONE;

    start = get_timer (0);
    last  = start;
    addr = (FLASH_WORD_SIZE *)(info->start[l_sect]);
    while ((addr[0] & (FLASH_WORD_SIZE)0x00800080) != (FLASH_WORD_SIZE)0x00800080) {
	if ((now = get_timer(start)) > CONFIG_SYS_FLASH_ERASE_TOUT) {
	    printf ("Timeout\n");
	    return 1;
	}
	/* show that we're waiting */
	if ((now - last) > 1000) {  /* every second */
	    serial_putc ('.');
	    last = now;
	}
    }

DONE:
    /* reset to read mode */
    addr = (FLASH_WORD_SIZE *)info->start[0];
    addr[0] = (FLASH_WORD_SIZE)0x00F000F0;  /* reset bank */

    printf (" done\n");
    return rc;
}

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

    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_word(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_word(info, wp, data)) != 0) {
	    return (rc);
	}
	wp  += 4;
	cnt -= 4;
    }

    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_word(info, wp, data));
}

/*----------------------------------------------------------------------------*/
/* Write a word to Flash, returns:
 * 0 - OK
 * 1 - write timeout
 * 2 - Flash not erased
 */
static int write_word (flash_info_t *info, ulong dest, ulong data)
{
	volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *)(info->start[0]);
	volatile FLASH_WORD_SIZE *dest2 = (FLASH_WORD_SIZE *)dest;
	volatile FLASH_WORD_SIZE *data2 = (FLASH_WORD_SIZE *)&data;
    ulong start;
    int flag;
	int i;

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

	for (i=0; i<4/sizeof(FLASH_WORD_SIZE); i++)
	  {
	    addr2[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
	    addr2[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
	    addr2[ADDR0] = (FLASH_WORD_SIZE)0x00A000A0;

	    dest2[i] = data2[i];

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

	    /* data polling for D7 */
	    start = get_timer (0);
	    while ((dest2[i] & (FLASH_WORD_SIZE)0x00800080) !=
		   (data2[i] & (FLASH_WORD_SIZE)0x00800080)) {
	      if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
		return (1);
	      }
	    }
	  }

    return (0);
}

/*----------------------------------------------------------------------------*/
Commit	Line	Data
e69b4b8f WD	1	/*
	2	* (C) Copyright 2000
	3	* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
	4	*
	5	* See file CREDITS for list of people who contributed to this
	6	* project.
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License as
	10	* published by the Free Software Foundation; either version 2 of
	11	* the License, or (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	21	* MA 02111-1307 USA
	22	*/
	23
	24	/*
	25	* 07-10-2002 Frank Gottschling: added 29F032 flash (ELPPC).
	26	* fixed monitor protection part
	27	*
	28	* 09-18-2001 Andreas Heppel: Reduced the code in here to the usage
	29	* of AMD's 29F040 and 29F016 flashes, since the BAB7xx does use
	30	* any other.
	31	*/
	32
	33	#include <common.h>
	34	#include <asm/processor.h>
	35	#include <asm/pci_io.h>
	36
6d0f6bcf	37	flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS]; /* info for FLASH chips */
e69b4b8f WD	38
	39	ulong flash_get_size (vu_long addr, flash_info_t info);
	40	static int write_word (flash_info_t *info, ulong dest, ulong data);
	41
	42	/flash command address offsets/
	43
	44	#define ADDR0 (0x555)
	45	#define ADDR1 (0x2AA)
	46	#define ADDR3 (0x001)
	47
	48	#define FLASH_WORD_SIZE unsigned char
	49
	50	/----------------------------------------------------------------------------/
	51
	52	unsigned long flash_init (void)
	53	{
	54	unsigned long size1, size2;
	55	int i;
	56
	57	/* Init: no FLASHes known */
6d0f6bcf	58	for (i=0; i<CONFIG_SYS_MAX_FLASH_BANKS; ++i)
e69b4b8f	59	{
8bde7f77	60	flash_info[i].flash_id = FLASH_UNKNOWN;
e69b4b8f WD	61	}
	62
	63	/* initialise 1st flash */
	64	size1 = flash_get_size((vu_long *)FLASH_BASE0_PRELIM, &flash_info[0]);
	65
	66	if (flash_info[0].flash_id == FLASH_UNKNOWN)
	67	{
8bde7f77 WD	68	printf ("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
8bde7f77 WD	69	size1, size1<<20);
e69b4b8f WD	70	}
	71
	72	/* initialise 2nd flash */
	73	size2 = flash_get_size((vu_long *)FLASH_BASE1_PRELIM, &flash_info[1]);
	74
	75	if (flash_info[1].flash_id == FLASH_UNKNOWN)
	76	{
8bde7f77 WD	77	printf ("## Unknown FLASH on Bank 1 - Size = 0x%08lx = %ld MB\n",
8bde7f77 WD	78	size2, size2<<20);
e69b4b8f WD	79	}
	80
	81	/* monitor protection ON by default */
	82	if (size1 == 512*1024)
	83	{
8bde7f77 WD	84	(void)flash_protect(FLAG_PROTECT_SET,
	85	FLASH_BASE0_PRELIM,
	86	FLASH_BASE0_PRELIM+monitor_flash_len-1,
	87	&flash_info[0]);
e69b4b8f WD	88	}
	89	if (size2 == 512*1024)
	90	{
8bde7f77 WD	91	(void)flash_protect(FLAG_PROTECT_SET,
	92	FLASH_BASE1_PRELIM,
	93	FLASH_BASE1_PRELIM+monitor_flash_len-1,
	94	&flash_info[1]);
e69b4b8f WD	95	}
	96	if (size2 == 410241024)
	97	{
8bde7f77	98	(void)flash_protect(FLAG_PROTECT_SET,
6d0f6bcf JCPV	99	CONFIG_SYS_FLASH_BASE,
6d0f6bcf JCPV	100	CONFIG_SYS_FLASH_BASE+monitor_flash_len-1,
8bde7f77	101	&flash_info[1]);
e69b4b8f WD	102	}
	103
	104	return (size1 + size2);
	105	}
	106
	107	/----------------------------------------------------------------------------/
	108
	109	void flash_print_info (flash_info_t *info)
	110	{
	111	int i;
	112	int k;
	113	int size;
	114	int erased;
	115	volatile unsigned long *flash;
	116
	117	if (info->flash_id == FLASH_UNKNOWN) {
8bde7f77 WD	118	printf ("missing or unknown FLASH type\n");
8bde7f77 WD	119	flash_init();
e69b4b8f WD	120	}
	121
	122	if (info->flash_id == FLASH_UNKNOWN) {
8bde7f77 WD	123	printf ("missing or unknown FLASH type\n");
8bde7f77 WD	124	return;
e69b4b8f WD	125	}
	126
	127	switch (info->flash_id & FLASH_VENDMASK) {
	128	case FLASH_MAN_AMD:
8bde7f77 WD	129	printf ("AMD ");
8bde7f77 WD	130	break;
e69b4b8f	131	default:
8bde7f77 WD	132	printf ("Unknown Vendor ");
8bde7f77 WD	133	break;
e69b4b8f WD	134	}
	135
	136	switch (info->flash_id & FLASH_TYPEMASK) {
	137	case AMD_ID_F040B:
8bde7f77 WD	138	printf ("AM29F040B (4 Mbit)\n");
8bde7f77 WD	139	break;
e69b4b8f	140	case AMD_ID_F016D:
8bde7f77 WD	141	printf ("AM29F016D (16 Mbit)\n");
8bde7f77 WD	142	break;
e69b4b8f	143	case AMD_ID_F032B:
8bde7f77 WD	144	printf ("AM29F032B (32 Mbit)\n");
8bde7f77 WD	145	break;
e69b4b8f	146	default:
8bde7f77 WD	147	printf ("Unknown Chip Type\n");
8bde7f77 WD	148	break;
e69b4b8f WD	149	}
	150
	151	if (info->size >= (1 << 20)) {
8bde7f77	152	printf (" Size: %ld MB in %d Sectors\n", info->size >> 20, info->sector_count);
e69b4b8f	153	} else {
8bde7f77	154	printf (" Size: %ld kB in %d Sectors\n", info->size >> 10, info->sector_count);
e69b4b8f WD	155	}
	156
	157	printf (" Sector Start Addresses:");
	158	for (i=0; i<info->sector_count; ++i) {
8bde7f77 WD	159	/*
	160	* Check if whole sector is erased
	161	*/
	162	if (i != (info->sector_count-1))
	163	size = info->start[i+1] - info->start[i];
	164	else
	165	size = info->start[0] + info->size - info->start[i];
	166
	167	erased = 1;
	168	flash = (volatile unsigned long *)info->start[i];
	169	size = size >> 2; /* divide by 4 for longword access */
	170	for (k=0; k<size; k++) {
	171	if (*flash++ != 0xffffffff) {
	172	erased = 0;
	173	break;
	174	}
	175	}
	176
	177	if ((i % 5) == 0)
	178	printf ("\n ");
	179
	180	printf (" %08lX%s%s",
	181	info->start[i],
	182	erased ? " E" : " ",
	183	info->protect[i] ? "RO " : " ");
e69b4b8f WD	184	}
	185	printf ("\n");
	186	}
	187
	188	/----------------------------------------------------------------------------/
	189	/*
	190	* The following code cannot be run from FLASH!
	191	*/
	192	ulong flash_get_size (vu_long addr, flash_info_t info)
	193	{
	194	short i;
	195	ulong vendor, devid;
	196	ulong base = (ulong)addr;
	197	volatile unsigned char caddr = (unsigned char )addr;
	198
	199	#ifdef DEBUG
	200	printf("flash_get_size for address 0x%lx: \n", (unsigned long)caddr);
	201	#endif
	202
	203	/* Write auto select command: read Manufacturer ID */
	204	caddr[0] = 0xF0; /* reset bank */
	205	udelay(10);
	206
	207	eieio();
	208	caddr[0x555] = 0xAA;
	209	udelay(10);
	210	caddr[0x2AA] = 0x55;
	211	udelay(10);
	212	caddr[0x555] = 0x90;
	213
	214	udelay(10);
	215
	216	vendor = caddr[0];
	217	devid = caddr[1];
	218
	219	#ifdef DEBUG
	220	printf("Manufacturer: 0x%lx\n", vendor);
	221	#endif
	222
	223	vendor &= 0xff;
	224	devid &= 0xff;
	225
	226	/* We accept only two AMD types */
	227	switch (vendor) {
	228	case (FLASH_WORD_SIZE)AMD_MANUFACT:
8bde7f77 WD	229	info->flash_id = FLASH_MAN_AMD;
8bde7f77 WD	230	break;
e69b4b8f	231	default:
8bde7f77 WD	232	info->flash_id = FLASH_UNKNOWN;
	233	info->sector_count = 0;
	234	info->size = 0;
	235	return (0); /* no or unknown flash */
e69b4b8f WD	236	}
	237
	238	switch (devid) {
	239	case (FLASH_WORD_SIZE)AMD_ID_F040B:
8bde7f77 WD	240	info->flash_id \|= AMD_ID_F040B;
	241	info->sector_count = 8;
	242	info->size = 0x00080000;
	243	break; /* => 0.5 MB */
e69b4b8f WD	244
e69b4b8f WD	245	case (FLASH_WORD_SIZE)AMD_ID_F016D:
8bde7f77 WD	246	info->flash_id \|= AMD_ID_F016D;
	247	info->sector_count = 32;
	248	info->size = 0x00200000;
	249	break; /* => 2 MB */
e69b4b8f WD	250
e69b4b8f WD	251	case (FLASH_WORD_SIZE)AMD_ID_F032B:
8bde7f77 WD	252	info->flash_id \|= AMD_ID_F032B;
	253	info->sector_count = 64;
	254	info->size = 0x00400000;
	255	break; /* => 4 MB */
e69b4b8f WD	256
e69b4b8f WD	257	default:
8bde7f77 WD	258	info->flash_id = FLASH_UNKNOWN;
8bde7f77 WD	259	return (0); /* => no or unknown flash */
e69b4b8f WD	260
	261	}
	262
	263	#ifdef DEBUG
	264	printf("flash id 0x%lx; sector count 0x%x, size 0x%lx\n", info->flash_id, info->sector_count, info->size);
	265	#endif
	266
	267	/* check for protected sectors */
	268	for (i = 0; i < info->sector_count; i++) {
8bde7f77 WD	269	/* sector base address */
	270	info->start[i] = base + i * (info->size / info->sector_count);
	271	/* read sector protection at sector address, (A7 .. A0) = 0x02 */
	272	/* D0 = 1 if protected */
	273	caddr = (volatile unsigned char *)(info->start[i]);
	274	info->protect[i] = caddr[2] & 1;
e69b4b8f WD	275	}
	276
	277	/*
	278	* Prevent writes to uninitialized FLASH.
	279	*/
	280	if (info->flash_id != FLASH_UNKNOWN) {
8bde7f77 WD	281	caddr = (volatile unsigned char *)info->start[0];
8bde7f77 WD	282	caddr[0] = 0xF0; /* reset bank */
e69b4b8f WD	283	}
	284
	285	return (info->size);
	286	}
	287
	288	/----------------------------------------------------------------------------/
	289
	290	int flash_erase (flash_info_t *info, int s_first, int s_last)
	291	{
	292	volatile FLASH_WORD_SIZE addr = (FLASH_WORD_SIZE )(info->start[0]);
	293	int flag, prot, sect, l_sect;
	294	ulong start, now, last;
	295	int rc = 0;
	296
	297	if ((s_first < 0) \|\| (s_first > s_last)) {
8bde7f77 WD	298	if (info->flash_id == FLASH_UNKNOWN) {
	299	printf ("- missing\n");
	300	} else {
	301	printf ("- no sectors to erase\n");
	302	}
	303	return 1;
e69b4b8f WD	304	}
	305
	306	if ((info->flash_id == FLASH_UNKNOWN) \|\|
8bde7f77 WD	307	(info->flash_id > FLASH_AMD_COMP)) {
	308	printf ("Can't erase unknown flash type - aborted\n");
	309	return 1;
e69b4b8f WD	310	}
	311
	312	prot = 0;
	313	for (sect=s_first; sect<=s_last; ++sect) {
8bde7f77 WD	314	if (info->protect[sect]) {
	315	prot++;
	316	}
e69b4b8f WD	317	}
	318
	319	if (prot) {
8bde7f77 WD	320	printf ("- Warning: %d protected sectors will not be erased!\n",
8bde7f77 WD	321	prot);
e69b4b8f	322	} else {
8bde7f77	323	printf ("\n");
e69b4b8f WD	324	}
	325
	326	l_sect = -1;
	327
	328	/* Disable interrupts which might cause a timeout here */
	329	flag = disable_interrupts();
	330
	331	addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
	332	addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
	333	addr[ADDR0] = (FLASH_WORD_SIZE)0x00800080;
	334	addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
	335	addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
	336
	337	/* Start erase on unprotected sectors */
	338	for (sect = s_first; sect<=s_last; sect++) {
8bde7f77 WD	339	if (info->protect[sect] == 0) { /* not protected */
	340	addr = (FLASH_WORD_SIZE *)(info->start[sect]);
	341	if (info->flash_id & FLASH_MAN_SST) {
	342	addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
	343	addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
	344	addr[ADDR0] = (FLASH_WORD_SIZE)0x00800080;
	345	addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
	346	addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
	347	addr[0] = (FLASH_WORD_SIZE)0x00500050; /* block erase */
	348	udelay(30000); /* wait 30 ms */
	349	}
	350	else
	351	addr[0] = (FLASH_WORD_SIZE)0x00300030; /* sector erase */
	352	l_sect = sect;
	353	}
e69b4b8f WD	354	}
	355
	356	/* re-enable interrupts if necessary */
	357	if (flag)
8bde7f77	358	enable_interrupts();
e69b4b8f WD	359
	360	/* wait at least 80us - let's wait 1 ms */
	361	udelay (1000);
	362
	363	/*
	364	* We wait for the last triggered sector
	365	*/
	366	if (l_sect < 0)
8bde7f77	367	goto DONE;
e69b4b8f WD	368
	369	start = get_timer (0);
	370	last = start;
	371	addr = (FLASH_WORD_SIZE *)(info->start[l_sect]);
	372	while ((addr[0] & (FLASH_WORD_SIZE)0x00800080) != (FLASH_WORD_SIZE)0x00800080) {
6d0f6bcf	373	if ((now = get_timer(start)) > CONFIG_SYS_FLASH_ERASE_TOUT) {
8bde7f77 WD	374	printf ("Timeout\n");
	375	return 1;
	376	}
	377	/* show that we're waiting */
	378	if ((now - last) > 1000) { /* every second */
	379	serial_putc ('.');
	380	last = now;
	381	}
e69b4b8f WD	382	}
	383
	384	DONE:
	385	/* reset to read mode */
	386	addr = (FLASH_WORD_SIZE *)info->start[0];
	387	addr[0] = (FLASH_WORD_SIZE)0x00F000F0; /* reset bank */
	388
	389	printf (" done\n");
	390	return rc;
	391	}
	392
	393	/----------------------------------------------------------------------------/
	394	/*
	395	* Copy memory to flash, returns:
	396	* 0 - OK
	397	* 1 - write timeout
	398	* 2 - Flash not erased
	399	*/
	400	int write_buff (flash_info_t info, uchar src, ulong addr, ulong cnt)
	401	{
	402	ulong cp, wp, data;
	403	int i, l, rc;
	404
	405	wp = (addr & ~3); /* get lower word aligned address */
	406
	407	/*
	408	* handle unaligned start bytes
	409	*/
	410	if ((l = addr - wp) != 0) {
8bde7f77 WD	411	data = 0;
	412	for (i=0, cp=wp; i<l; ++i, ++cp) {
	413	data = (data << 8) \| ((uchar )cp);
	414	}
	415	for (; i<4 && cnt>0; ++i) {
	416	data = (data << 8) \| *src++;
	417	--cnt;
	418	++cp;
	419	}
	420	for (; cnt==0 && i<4; ++i, ++cp) {
	421	data = (data << 8) \| ((uchar )cp);
	422	}
	423
	424	if ((rc = write_word(info, wp, data)) != 0) {
	425	return (rc);
	426	}
	427	wp += 4;
e69b4b8f WD	428	}
	429
	430	/*
	431	* handle word aligned part
	432	*/
	433	while (cnt >= 4) {
8bde7f77 WD	434	data = 0;
	435	for (i=0; i<4; ++i) {
	436	data = (data << 8) \| *src++;
	437	}
	438	if ((rc = write_word(info, wp, data)) != 0) {
	439	return (rc);
	440	}
	441	wp += 4;
	442	cnt -= 4;
e69b4b8f WD	443	}
	444
	445	if (cnt == 0) {
8bde7f77	446	return (0);
e69b4b8f WD	447	}
	448
	449	/*
	450	* handle unaligned tail bytes
	451	*/
	452	data = 0;
	453	for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
8bde7f77 WD	454	data = (data << 8) \| *src++;
8bde7f77 WD	455	--cnt;
e69b4b8f WD	456	}
e69b4b8f WD	457	for (; i<4; ++i, ++cp) {
8bde7f77	458	data = (data << 8) \| ((uchar )cp);
e69b4b8f WD	459	}
	460
	461	return (write_word(info, wp, data));
	462	}
	463
	464	/----------------------------------------------------------------------------/
	465	/* Write a word to Flash, returns:
	466	* 0 - OK
	467	* 1 - write timeout
	468	* 2 - Flash not erased
	469	*/
	470	static int write_word (flash_info_t *info, ulong dest, ulong data)
	471	{
8bde7f77 WD	472	volatile FLASH_WORD_SIZE addr2 = (FLASH_WORD_SIZE )(info->start[0]);
	473	volatile FLASH_WORD_SIZE dest2 = (FLASH_WORD_SIZE )dest;
	474	volatile FLASH_WORD_SIZE data2 = (FLASH_WORD_SIZE )&data;
e69b4b8f WD	475	ulong start;
e69b4b8f WD	476	int flag;
8bde7f77	477	int i;
e69b4b8f WD	478
	479	/* Check if Flash is (sufficiently) erased */
	480	if ((((volatile FLASH_WORD_SIZE )dest) &
8bde7f77 WD	481	(FLASH_WORD_SIZE)data) != (FLASH_WORD_SIZE)data) {
8bde7f77 WD	482	return (2);
e69b4b8f WD	483	}
	484	/* Disable interrupts which might cause a timeout here */
	485	flag = disable_interrupts();
	486
8bde7f77 WD	487	for (i=0; i<4/sizeof(FLASH_WORD_SIZE); i++)
	488	{
	489	addr2[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
	490	addr2[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
	491	addr2[ADDR0] = (FLASH_WORD_SIZE)0x00A000A0;
e69b4b8f	492
8bde7f77	493	dest2[i] = data2[i];
e69b4b8f	494
8bde7f77 WD	495	/* re-enable interrupts if necessary */
	496	if (flag)
	497	enable_interrupts();
e69b4b8f	498
8bde7f77 WD	499	/* data polling for D7 */
	500	start = get_timer (0);
	501	while ((dest2[i] & (FLASH_WORD_SIZE)0x00800080) !=
	502	(data2[i] & (FLASH_WORD_SIZE)0x00800080)) {
6d0f6bcf	503	if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
8bde7f77 WD	504	return (1);
	505	}
	506	}
	507	}
e69b4b8f WD	508
	509	return (0);
	510	}
	511
	512	/----------------------------------------------------------------------------/