/*
* (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
*/
#include <common.h>
#include <mpc8xx.h>
flash_info_t flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips */
/*-----------------------------------------------------------------------
* Functions
*/
static ulong flash_get_size (vu_long *addr, flash_info_t *info);
static int write_word (flash_info_t *info, ulong dest, ulong data);
static void flash_get_offsets (ulong base, flash_info_t *info);
/*-----------------------------------------------------------------------
*/
unsigned long flash_init (void)
{
unsigned long size_b0, size_b1;
int i;
/* Init: no FLASHes known */
for (i=0; i < CFG_MAX_FLASH_BANKS; ++i)
flash_info[i].flash_id = FLASH_UNKNOWN;
/* Detect size */
size_b0 = flash_get_size((vu_long *)CFG_FLASH_BASE, &flash_info[0]);
/* Setup offsets */
flash_get_offsets (CFG_FLASH_BASE, &flash_info[0]);
#if CFG_MONITOR_BASE >= CFG_FLASH_BASE
/* Monitor protection ON by default */
flash_protect(FLAG_PROTECT_SET,
CFG_MONITOR_BASE,
CFG_MONITOR_BASE+CFG_MONITOR_LEN-1,
&flash_info[0]);
#endif
size_b1 = 0 ;
flash_info[1].flash_id = FLASH_UNKNOWN;
flash_info[1].sector_count = -1;
flash_info[0].size = size_b0;
flash_info[1].size = size_b1;
return (size_b0 + size_b1);
}
/*-----------------------------------------------------------------------
* Fix this to support variable sector sizes
*/
static void flash_get_offsets (ulong base, flash_info_t *info)
{
int i;
/* set up sector start address table */
if ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM040) {
/* set sector offsets for bottom boot block type */
for (i = 0; i < info->sector_count; i++)
info->start[i] = base + (i * 0x00010000);
}
}
/*-----------------------------------------------------------------------
*/
void flash_print_info (flash_info_t *info)
{
int i;
if (info->flash_id == FLASH_UNKNOWN)
{
puts ("missing or unknown FLASH type\n");
return;
}
switch (info->flash_id & FLASH_VENDMASK)
{
case FLASH_MAN_AMD: printf ("AMD "); break;
case FLASH_MAN_FUJ: printf ("FUJITSU "); break;
case FLASH_MAN_BM: printf ("BRIGHT MICRO "); break;
default: printf ("Unknown Vendor "); break;
}
switch (info->flash_id & FLASH_TYPEMASK)
{
case FLASH_AM040: printf ("29F040 or 29LV040 (4 Mbit, uniform sectors)\n");
break;
case FLASH_AM400B: printf ("AM29LV400B (4 Mbit, bottom boot sect)\n");
break;
case FLASH_AM400T: printf ("AM29LV400T (4 Mbit, top boot sector)\n");
break;
case FLASH_AM800B: printf ("AM29LV800B (8 Mbit, bottom boot sect)\n");
break;
case FLASH_AM800T: printf ("AM29LV800T (8 Mbit, top boot sector)\n");
break;
case FLASH_AM160B: printf ("AM29LV160B (16 Mbit, bottom boot sect)\n");
break;
case FLASH_AM160T: printf ("AM29LV160T (16 Mbit, top boot sector)\n");
break;
case FLASH_AM320B: printf ("AM29LV320B (32 Mbit, bottom boot sect)\n");
break;
case FLASH_AM320T: printf ("AM29LV320T (32 Mbit, top boot sector)\n");
break;
default: printf ("Unknown Chip Type\n");
break;
}
if (info->size >> 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);
}
puts (" Sector Start Addresses:");
for (i=0; i<info->sector_count; ++i)
{
if ((i % 5) == 0)
{
puts ("\n ");
}
printf (" %08lX%s",
info->start[i],
info->protect[i] ? " (RO)" : " ");
}
putc ('\n');
return;
}
/*-----------------------------------------------------------------------
*/
/*
* The following code cannot be run from FLASH!
*/
static ulong flash_get_size (vu_long *addr, flash_info_t *info)
{
short i;
volatile unsigned char *caddr;
char value;
caddr = (volatile unsigned char *)addr ;
/* Write auto select command: read Manufacturer ID */
#if 0
printf("Base address is: %08x\n", caddr);
#endif
caddr[0x0555] = 0xAA;
caddr[0x02AA] = 0x55;
caddr[0x0555] = 0x90;
value = caddr[0];
#if 0
printf("Manufact ID: %02x\n", value);
#endif
switch (value)
{
case 0x01:
case AMD_MANUFACT:
info->flash_id = FLASH_MAN_AMD;
break;
case FUJ_MANUFACT:
info->flash_id = FLASH_MAN_FUJ;
break;
default:
info->flash_id = FLASH_UNKNOWN;
info->sector_count = 0;
info->size = 0;
break;
}
value = caddr[1]; /* device ID */
#if 0
printf("Device ID: %02x\n", value);
#endif
switch (value)
{
case AMD_ID_LV040B:
info->flash_id += FLASH_AM040;
info->sector_count = 8;
info->size = 0x00080000;
break; /* => 512Kb */
default:
info->flash_id = FLASH_UNKNOWN;
return (0); /* => no or unknown flash */
}
flash_get_offsets ((ulong)addr, &flash_info[0]);
/* check for protected sectors */
for (i = 0; i < info->sector_count; i++)
{
/* 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 = 0xF0; /* reset bank */
}
return (info->size);
}
/*-----------------------------------------------------------------------
*/
int flash_erase (flash_info_t *info, int s_first, int s_last)
{
volatile unsigned char *addr = (volatile unsigned char *)(info->start[0]);
int flag, prot, sect, l_sect;
ulong start, now, last;
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[0x0555] = 0xAA;
addr[0x02AA] = 0x55;
addr[0x0555] = 0x80;
addr[0x0555] = 0xAA;
addr[0x02AA] = 0x55;
/* Start erase on unprotected sectors */
for (sect = s_first; sect<=s_last; sect++) {
if (info->protect[sect] == 0) { /* not protected */
addr = (volatile unsigned char *)(info->start[sect]);
addr[0] = 0x30;
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 = (volatile unsigned char *)(info->start[l_sect]);
while ((addr[0] & 0xFF) != 0xFF)
{
if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
printf ("Timeout\n");
return 1;
}
/* show that we're waiting */
if ((now - last) > 1000) { /* every second */
putc ('.');
last = now;
}
}
DONE:
/* reset to read mode */
addr = (volatile unsigned char *)info->start[0];
addr[0] = 0xF0; /* reset bank */
printf (" done\n");
return 0;
}
/*-----------------------------------------------------------------------
* 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 unsigned char *addr = (volatile unsigned char*)(info->start[0]),
*cdest,*cdata;
ulong start;
int flag, count = 4 ;
cdest = (volatile unsigned char *)dest ;
cdata = (volatile unsigned char *)&data ;
/* Check if Flash is (sufficiently) erased */
if ((*((vu_long *)dest) & data) != data) {
return (2);
}
while(count--)
{
/* Disable interrupts which might cause a timeout here */
flag = disable_interrupts();
addr[0x0555] = 0xAA;
addr[0x02AA] = 0x55;
addr[0x0555] = 0xA0;
*cdest = *cdata;
/* re-enable interrupts if necessary */
if (flag)
enable_interrupts();
/* data polling for D7 */
start = get_timer (0);
while ((*cdest ^ *cdata) & 0x80)
{
if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
return (1);
}
}
cdata++ ;
cdest++ ;
}
return (0);
}
/*-----------------------------------------------------------------------
*/
