u-boot/board/oxc/flash.c
wdenk 3b57fe0a70 * Get (mostly) rid of CFG_MONITOR_LEN definition; compute real length
instead CFG_MONITOR_LEN is now only used to determine  _at_compile_
  _time_  (!) if the environment is embedded within the U-Boot image,
  or in a separate flash sector.

* Cleanup CFG_DER #defines in config files (wd maintained only)
2003-05-30 12:48:29 +00:00

373 lines
8.9 KiB
C

/*
* (C) Copyright 2000
* Marius Groeger <mgroeger@sysgo.de>
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
*
* (C) Copyright 2000
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* Flash Routines for STM29W320DB/STM29W800D flash chips
*
*--------------------------------------------------------------------
* 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_char *addr, flash_info_t *info);
static int write_byte (flash_info_t *info, ulong dest, uchar data);
/*-----------------------------------------------------------------------
*/
unsigned long flash_init (void)
{
unsigned long size;
int i;
/* Init: no FLASHes known */
for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
flash_info[i].flash_id = FLASH_UNKNOWN;
}
/*
* We use the following trick here: since flash is cyclically
* mapped in the 0xFF800000-0xFFFFFFFF area, we detect the type
* and the size of flash using 0xFF800000 as the base address,
* and then call flash_get_size() again to fill flash_info.
*/
size = flash_get_size((vu_char *)CFG_FLASH_PRELIMBASE, &flash_info[0]);
if (size)
{
flash_get_size((vu_char *)(-size), &flash_info[0]);
}
#if (CFG_MONITOR_BASE >= CFG_FLASH_PRELIMBASE)
/* monitor protection ON by default */
flash_protect(FLAG_PROTECT_SET,
CFG_MONITOR_BASE,
CFG_MONITOR_BASE+monitor_flash_len-1,
&flash_info[0]);
#endif
#if (CFG_ENV_IS_IN_FLASH == 1) && defined(CFG_ENV_ADDR)
# ifndef CFG_ENV_SIZE
# define CFG_ENV_SIZE CFG_ENV_SECT_SIZE
# endif
flash_protect(FLAG_PROTECT_SET,
CFG_ENV_ADDR,
CFG_ENV_ADDR + CFG_ENV_SIZE - 1,
&flash_info[0]);
#endif
return (size);
}
/*-----------------------------------------------------------------------
*/
void flash_print_info (flash_info_t *info)
{
int i;
if (info->flash_id == FLASH_UNKNOWN) {
printf ("missing or unknown FLASH type\n");
return;
}
switch (info->flash_id & FLASH_VENDMASK) {
case FLASH_MAN_STM:
printf ("ST ");
break;
default:
printf ("Unknown Vendor ");
break;
}
switch (info->flash_id & FLASH_TYPEMASK) {
case FLASH_STM320DB:
printf ("M29W320DB (32 Mbit)\n");
break;
case FLASH_STM800DB:
printf ("M29W800DB (8 Mbit, bottom boot block)\n");
break;
case FLASH_STM800DT:
printf ("M29W800DT (8 Mbit, top boot block)\n");
break;
default:
printf ("Unknown Chip Type\n");
break;
}
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) {
if ((i % 5) == 0)
printf ("\n ");
printf (" %08lX%s",
info->start[i],
info->protect[i] ? " (RO)" : " "
);
}
printf ("\n");
return;
}
/*
* The following code cannot be run from FLASH!
*/
static ulong flash_get_size (vu_char *addr, flash_info_t *info)
{
short i;
uchar vendor, devid;
ulong base = (ulong)addr;
/* Write auto select command: read Manufacturer ID */
addr[0x0AAA] = 0xAA;
addr[0x0555] = 0x55;
addr[0x0AAA] = 0x90;
udelay(1000);
vendor = addr[0];
devid = addr[2];
/* only support STM */
if ((vendor << 16) != FLASH_MAN_STM) {
return 0;
}
if (devid == FLASH_STM320DB) {
/* MPC8240 can address maximum 2Mb of flash, that is why the MSB
* lead is grounded and we can access only 2 first Mb */
info->flash_id = vendor << 16 | devid;
info->sector_count = 32;
info->size = info->sector_count * 0x10000;
for (i = 0; i < info->sector_count; i++) {
info->start[i] = base + i * 0x10000;
}
}
else if (devid == FLASH_STM800DB) {
info->flash_id = vendor << 16 | devid;
info->sector_count = 19;
info->size = 0x100000;
info->start[0] = 0x0000;
info->start[1] = 0x4000;
info->start[2] = 0x6000;
info->start[3] = 0x8000;
for (i = 4; i < info->sector_count; i++) {
info->start[i] = base + (i-3) * 0x10000;
}
}
else if (devid == FLASH_STM800DT) {
info->flash_id = vendor << 16 | devid;
info->sector_count = 19;
info->size = 0x100000;
for (i = 0; i < info->sector_count-4; i++) {
info->start[i] = base + i * 0x10000;
}
info->start[i] = base + i * 0x10000;
info->start[i+1] = base + i * 0x10000 + 0x8000;
info->start[i+2] = base + i * 0x10000 + 0xa000;
info->start[i+3] = base + i * 0x10000 + 0xc000;
}
else {
return 0;
}
/* mark all sectors as unprotected */
for (i = 0; i < info->sector_count; i++) {
info->protect[i] = 0;
}
/* Issue the reset command */
if (info->flash_id != FLASH_UNKNOWN) {
addr[0] = 0xF0; /* reset bank */
}
return (info->size);
}
/*-----------------------------------------------------------------------
*/
int flash_erase (flash_info_t *info, int s_first, int s_last)
{
vu_char *addr = (vu_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;
}
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[0x0AAA] = 0xAA;
addr[0x0555] = 0x55;
addr[0x0AAA] = 0x80;
addr[0x0AAA] = 0xAA;
addr[0x0555] = 0x55;
/* wait at least 80us - let's wait 1 ms */
udelay (1000);
/* Start erase on unprotected sectors */
for (sect = s_first; sect<=s_last; sect++) {
if (info->protect[sect] == 0) { /* not protected */
addr = (vu_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 = (vu_char *)(info->start[l_sect]);
while ((addr[0] & 0x80) != 0x80) {
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 */
serial_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)
{
int rc;
while (cnt > 0) {
if ((rc = write_byte(info, addr, *src)) != 0) {
return (rc);
}
addr++;
src++;
cnt--;
}
return (0);
}
/*-----------------------------------------------------------------------
* Write a byte to Flash, returns:
* 0 - OK
* 1 - write timeout
* 2 - Flash not erased
*/
static int write_byte (flash_info_t *info, ulong dest, uchar data)
{
vu_char *addr = (vu_char *)(info->start[0]);
ulong start;
int flag;
/* Check if Flash is (sufficiently) erased */
if ((*((vu_char *)dest) & data) != data) {
return (2);
}
/* Disable interrupts which might cause a timeout here */
flag = disable_interrupts();
addr[0x0AAA] = 0xAA;
addr[0x0555] = 0x55;
addr[0x0AAA] = 0xA0;
*((vu_char *)dest) = data;
/* re-enable interrupts if necessary */
if (flag)
enable_interrupts();
/* data polling for D7 */
start = get_timer (0);
while ((*((vu_char *)dest) & 0x80) != (data & 0x80)) {
if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
return (1);
}
}
return (0);
}
/*-----------------------------------------------------------------------
*/