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u-boot/board/gw8260/flash.c
wdenk afd7f3d0de Initial revision
2002-11-03 01:41:26 +00:00

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/*
* (C) Copyright 2000
* Marius Groeger <mgroeger@sysgo.de>
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
*
* (C) Copyright 2000, 2001
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* (C) Copyright 2001
* Advent Networks, Inc. <http://www.adventnetworks.com>
* Oliver Brown <oliverb@alumni.utexas.net>
*
*--------------------------------------------------------------------
* 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
*/
/*********************************************************************/
/* DESCRIPTION:
* This file contains the flash routines for the GW8260 board.
*
*
*
* MODULE DEPENDENCY:
* None
*
*
* RESTRICTIONS/LIMITATIONS:
*
* Only supports the following flash devices:
* AMD 29F080B
* AMD 29F016D
*
* Copyright (c) 2001, Advent Networks, Inc.
*
*/
/*********************************************************************/
#include <common.h>
#include <mpc8260.h>
flash_info_t flash_info[CFG_MAX_FLASH_BANKS];
static ulong flash_get_size (vu_long *addr, flash_info_t *info);
static int write_word (flash_info_t *info, ulong dest, ulong data);
/*********************************************************************/
/* functions */
/*********************************************************************/
/*********************************************************************/
/* NAME: flash_init() - initializes flash banks */
/* */
/* DESCRIPTION: */
/* This function initializes the flash bank(s). */
/* */
/* RETURNS: */
/* The size in bytes of the flash */
/* */
/* RESTRICTIONS/LIMITATIONS: */
/* */
/* */
/*********************************************************************/
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;
}
/* for now, only support the 4 MB Flash SIMM */
size = flash_get_size((vu_long *)CFG_FLASH0_BASE, &flash_info[0]);
/*
* protect monitor and environment sectors
*/
#if CFG_MONITOR_BASE >= CFG_FLASH0_BASE
flash_protect(FLAG_PROTECT_SET,
CFG_MONITOR_BASE,
CFG_MONITOR_BASE+CFG_MONITOR_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 (CFG_FLASH0_SIZE * 1024 * 1024); /*size*/
}
/*********************************************************************/
/* NAME: flash_print_info() - prints flash imformation */
/* */
/* DESCRIPTION: */
/* This function prints the flash information. */
/* */
/* INPUTS: */
/* flash_info_t *info - flash information structure */
/* */
/* OUTPUTS: */
/* Displays flash information to console */
/* */
/* RETURNS: */
/* None */
/* */
/* RESTRICTIONS/LIMITATIONS: */
/* */
/* */
/*********************************************************************/
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 >> 16) & 0xff) {
case 0x1:
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_F080B:
printf ("AM29F080B (8 Mbit)\n");
break;
case AMD_ID_F016D:
printf ("AM29F016D (16 Mbit)\n");
break;
default:
printf ("Unknown Chip Type\n");
break;
}
printf (" Size: %ld MB in %d Sectors\n",
info->size >> 20, 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! */
/*********************************************************************/
/*********************************************************************/
/* NAME: flash_get_size() - detects the flash size */
/* */
/* DESCRIPTION: */
/* 1) Reads vendor ID and devices ID from the flash devices. */
/* 2) Initializes flash info struct. */
/* 3) Return the flash size */
/* */
/* INPUTS: */
/* vu_long *addr - pointer to start of flash */
/* flash_info_t *info - flash information structure */
/* */
/* OUTPUTS: */
/* None */
/* */
/* RETURNS: */
/* Size of the flash in bytes, or 0 if device id is unknown. */
/* */
/* RESTRICTIONS/LIMITATIONS: */
/* Only supports the following devices: */
/* AM29F080D */
/* AM29F016D */
/* */
/*********************************************************************/
static ulong flash_get_size (vu_long *addr, flash_info_t *info)
{
short i;
vu_long vendor, devid;
ulong base = (ulong)addr;
/*printf("addr = %08lx\n", (unsigned long)addr); */
/* Reset and Write auto select command: read Manufacturer ID */
addr[0x0000] = 0xf0f0f0f0;
addr[0x0555] = 0xAAAAAAAA;
addr[0x02AA] = 0x55555555;
addr[0x0555] = 0x90909090;
udelay (1000);
vendor = addr[0];
/*printf("vendor = %08lx\n", vendor); */
if (vendor != 0x01010101) {
info->size = 0;
goto out;
}
devid = addr[1];
/*printf("devid = %08lx\n", devid); */
if ((devid & 0xff) == AMD_ID_F080B) {
info->flash_id = (vendor & 0xff) << 16 | AMD_ID_F080B;
/* we have 16 sectors with 64KB each x 4 */
info->sector_count = 16;
info->size = 4 * info->sector_count * 64*1024;
} else if ((devid & 0xff) == AMD_ID_F016D){
info->flash_id = (vendor & 0xff) << 16 | AMD_ID_F016D;
/* we have 32 sectors with 64KB each x 4 */
info->sector_count = 32;
info->size = 4 * info->sector_count * 64*1024;
} else {
info->size = 0;
goto out;
}
/*printf("sector count = %08x\n", info->sector_count); */
/* 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 */
addr = (volatile unsigned long *)(info->start[i]);
info->protect[i] = addr[2] & 1;
}
/* reset command */
addr = (vu_long *)info->start[0];
out:
addr[0] = 0xf0f0f0f0;
/*printf("size = %08x\n", info->size); */
return info->size;
}
/*********************************************************************/
/* NAME: flash_erase() - erases flash by sector */
/* */
/* DESCRIPTION: */
/* This function erases flash sectors starting for s_first to */
/* s_last. */
/* */
/* INPUTS: */
/* flash_info_t *info - flash information structure */
/* int s_first - first sector to erase */
/* int s_last - last sector to erase */
/* */
/* OUTPUTS: */
/* None */
/* */
/* RETURNS: */
/* Returns 0 for success, 1 for failure. */
/* */
/* RESTRICTIONS/LIMITATIONS: */
/* */
/*********************************************************************/
int flash_erase (flash_info_t *info, int s_first, int s_last)
{
vu_long *addr = (vu_long*)(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[0x0555] = 0xAAAAAAAA;
addr[0x02AA] = 0x55555555;
addr[0x0555] = 0x80808080;
addr[0x0555] = 0xAAAAAAAA;
addr[0x02AA] = 0x55555555;
udelay (100);
/* Start erase on unprotected sectors */
for (sect = s_first; sect <= s_last; sect++) {
if (info->protect[sect] == 0) { /* not protected */
addr = (vu_long*)(info->start[sect]);
addr[0] = 0x30303030;
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_long*)(info->start[l_sect]);
while ((addr[0] & 0x80808080) != 0x80808080) {
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 long *)info->start[0];
addr[0] = 0xF0F0F0F0; /* reset bank */
printf (" done\n");
return 0;
}
/*********************************************************************/
/* NAME: write_buff() - writes a buffer to flash */
/* */
/* DESCRIPTION: */
/* This function copies a buffer, *src, to flash. */
/* */
/* INPUTS: */
/* flash_info_t *info - flash information structure */
/* uchar *src - pointer to buffer to write to flash */
/* ulong addr - address to start write at */
/* ulong cnt - number of bytes to write to flash */
/* */
/* OUTPUTS: */
/* None */
/* */
/* RETURNS: */
/* 0 - OK */
/* 1 - write timeout */
/* 2 - Flash not erased */
/* */
/* RESTRICTIONS/LIMITATIONS: */
/* */
/*********************************************************************/
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));
}
/*********************************************************************/
/* NAME: write_word() - writes a word to flash */
/* */
/* DESCRIPTION: */
/* This writes a single word to flash. */
/* */
/* INPUTS: */
/* flash_info_t *info - flash information structure */
/* ulong dest - address to write */
/* ulong data - data to write */
/* */
/* OUTPUTS: */
/* None */
/* */
/* RETURNS: */
/* 0 - OK */
/* 1 - write timeout */
/* 2 - Flash not erased */
/* */
/* RESTRICTIONS/LIMITATIONS: */
/* */
/*********************************************************************/
static int write_word (flash_info_t *info, ulong dest, ulong data)
{
vu_long *addr = (vu_long*)(info->start[0]);
ulong start;
int flag;
/* Check if Flash is (sufficiently) erased */
if ((*((vu_long *)dest) & data) != data) {
return (2);
}
/* Disable interrupts which might cause a timeout here */
flag = disable_interrupts();
addr[0x0555] = 0xAAAAAAAA;
addr[0x02AA] = 0x55555555;
addr[0x0555] = 0xA0A0A0A0;
*((vu_long *)dest) = data;
/* re-enable interrupts if necessary */
if (flag)
enable_interrupts();
/* data polling for D7 */
start = get_timer (0);
while ((*((vu_long *)dest) & 0x80808080) != (data & 0x80808080)) {
if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
return (1);
}
}
return (0);
}
/*********************************************************************/
/* End of flash.c */
/*********************************************************************/
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