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uboot-1.1.4-kirkwood/board/pcippc2/flash.c
Olaf Rempel f69754bccc u-boot 1.1.4
2024-01-07 23:57:24 +01:00

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/*
* (C) Copyright 2001
* Josh Huber <huber@mclx.com>, Mission Critical Linux, Inc.
*
* (C) Copyright 2002
* 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 <config.h>
#include <common.h>
#include <flash.h>
#include <asm/io.h>
/*---------------------------------------------------------------------*/
#undef DEBUG_FLASH
#ifdef DEBUG_FLASH
#define DEBUGF(fmt,args...) printf(fmt ,##args)
#else
#define DEBUGF(fmt,args...)
#endif
/*---------------------------------------------------------------------*/
flash_info_t flash_info[CFG_MAX_FLASH_BANKS];
static ulong flash_get_size (ulong addr, flash_info_t *info);
static int flash_get_offsets (ulong base, flash_info_t *info);
static int write_word (flash_info_t *info, ulong dest, ulong data);
static void flash_reset (ulong addr);
unsigned long flash_init (void)
{
unsigned int i;
unsigned long flash_size = 0;
/* Init: no FLASHes known */
for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
flash_info[i].flash_id = FLASH_UNKNOWN;
flash_info[i].sector_count = 0;
flash_info[i].size = 0;
}
DEBUGF("\n## Get flash size @ 0x%08x\n", CFG_FLASH_BASE);
flash_size = flash_get_size (CFG_FLASH_BASE, flash_info);
DEBUGF("## Flash bank size: %08lx\n", flash_size);
if (flash_size) {
#if CFG_MONITOR_BASE >= CFG_FLASH_BASE && \
CFG_MONITOR_BASE < CFG_FLASH_BASE + CFG_FLASH_MAX_SIZE
/* monitor protection ON by default */
flash_protect(FLAG_PROTECT_SET,
CFG_MONITOR_BASE,
CFG_MONITOR_BASE + monitor_flash_len - 1,
&flash_info[0]);
#endif
#ifdef CFG_ENV_IS_IN_FLASH
/* ENV protection ON by default */
flash_protect(FLAG_PROTECT_SET,
CFG_ENV_ADDR,
CFG_ENV_ADDR + CFG_ENV_SECT_SIZE - 1,
&flash_info[0]);
#endif
} else {
puts ("Warning: the BOOT Flash is not initialised !");
}
return flash_size;
}
/*
* The following code cannot be run from FLASH!
*/
static ulong flash_get_size (ulong addr, flash_info_t *info)
{
short i;
uchar value;
/* Write auto select command: read Manufacturer ID */
out8(addr + 0x0555, 0xAA);
iobarrier_rw();
out8(addr + 0x02AA, 0x55);
iobarrier_rw();
out8(addr + 0x0555, 0x90);
iobarrier_rw();
value = in8(addr);
iobarrier_rw();
DEBUGF("Manuf. ID @ 0x%08lx: 0x%08x\n", (ulong)addr, value);
switch (value | (value << 16)) {
case AMD_MANUFACT:
info->flash_id = FLASH_MAN_AMD;
break;
case FUJ_MANUFACT:
info->flash_id = FLASH_MAN_FUJ;
break;
case STM_MANUFACT:
info->flash_id = FLASH_MAN_STM;
break;
default:
info->flash_id = FLASH_UNKNOWN;
info->sector_count = 0;
info->size = 0;
flash_reset (addr);
return 0;
}
value = in8(addr + 1); /* device ID */
iobarrier_rw();
DEBUGF("Device ID @ 0x%08lx: 0x%08x\n", addr+1, value);
switch ((ulong)value) {
case AMD_ID_F040B:
DEBUGF("Am29F040B\n");
info->flash_id += FLASH_AM040;
info->sector_count = 8;
info->size = 0x00080000;
break; /* => 512 kB */
case AMD_ID_LV040B:
DEBUGF("Am29LV040B\n");
info->flash_id += FLASH_AM040;
info->sector_count = 8;
info->size = 0x00080000;
break; /* => 512 kB */
case AMD_ID_LV400T:
DEBUGF("Am29LV400T\n");
info->flash_id += FLASH_AM400T;
info->sector_count = 11;
info->size = 0x00100000;
break; /* => 1 MB */
case AMD_ID_LV400B:
DEBUGF("Am29LV400B\n");
info->flash_id += FLASH_AM400B;
info->sector_count = 11;
info->size = 0x00100000;
break; /* => 1 MB */
case AMD_ID_LV800T:
DEBUGF("Am29LV800T\n");
info->flash_id += FLASH_AM800T;
info->sector_count = 19;
info->size = 0x00200000;
break; /* => 2 MB */
case AMD_ID_LV800B:
DEBUGF("Am29LV400B\n");
info->flash_id += FLASH_AM800B;
info->sector_count = 19;
info->size = 0x00200000;
break; /* => 2 MB */
case AMD_ID_LV160T:
DEBUGF("Am29LV160T\n");
info->flash_id += FLASH_AM160T;
info->sector_count = 35;
info->size = 0x00400000;
break; /* => 4 MB */
case AMD_ID_LV160B:
DEBUGF("Am29LV160B\n");
info->flash_id += FLASH_AM160B;
info->sector_count = 35;
info->size = 0x00400000;
break; /* => 4 MB */
case AMD_ID_LV320T:
DEBUGF("Am29LV320T\n");
info->flash_id += FLASH_AM320T;
info->sector_count = 67;
info->size = 0x00800000;
break; /* => 8 MB */
#if 0
/* Has the same ID as AMD_ID_LV320T, to be fixed */
case AMD_ID_LV320B:
DEBUGF("Am29LV320B\n");
info->flash_id += FLASH_AM320B;
info->sector_count = 67;
info->size = 0x00800000;
break; /* => 8 MB */
#endif
case AMD_ID_LV033C:
DEBUGF("Am29LV033C\n");
info->flash_id += FLASH_AM033C;
info->sector_count = 64;
info->size = 0x01000000;
break; /* => 16Mb */
case STM_ID_F040B:
DEBUGF("M29F040B\n");
info->flash_id += FLASH_AM040;
info->sector_count = 8;
info->size = 0x00080000;
break; /* => 512 kB */
default:
info->flash_id = FLASH_UNKNOWN;
flash_reset (addr);
return (0); /* => no or unknown flash */
}
if (info->sector_count > CFG_MAX_FLASH_SECT) {
printf ("** ERROR: sector count %d > max (%d) **\n",
info->sector_count, CFG_MAX_FLASH_SECT);
info->sector_count = CFG_MAX_FLASH_SECT;
}
if (! flash_get_offsets (addr, info)) {
flash_reset (addr);
return 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 */
value = in8(info->start[i] + 2);
iobarrier_rw();
info->protect[i] = (value & 1) != 0;
}
/*
* Reset bank to read mode
*/
flash_reset (addr);
return (info->size);
}
static int flash_get_offsets (ulong base, flash_info_t *info)
{
unsigned int i;
switch (info->flash_id & FLASH_TYPEMASK) {
case FLASH_AM040:
/* set sector offsets for uniform sector type */
for (i = 0; i < info->sector_count; i++) {
info->start[i] = base + i * info->size /
info->sector_count;
}
break;
default:
return 0;
}
return 1;
}
int flash_erase (flash_info_t *info, int s_first, int s_last)
{
volatile ulong addr = 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) {
printf ("Can't erase unknown flash type %08lx - aborted\n",
info->flash_id);
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();
out8(addr + 0x555, 0xAA);
iobarrier_rw();
out8(addr + 0x2AA, 0x55);
iobarrier_rw();
out8(addr + 0x555, 0x80);
iobarrier_rw();
out8(addr + 0x555, 0xAA);
iobarrier_rw();
out8(addr + 0x2AA, 0x55);
iobarrier_rw();
/* Start erase on unprotected sectors */
for (sect = s_first; sect<=s_last; sect++) {
if (info->protect[sect] == 0) { /* not protected */
addr = info->start[sect];
out8(addr, 0x30);
iobarrier_rw();
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 = info->start[l_sect];
DEBUGF ("Start erase timeout: %d\n", CFG_FLASH_ERASE_TOUT);
while ((in8(addr) & 0x80) != 0x80) {
if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
printf ("Timeout\n");
flash_reset (info->start[0]);
return 1;
}
/* show that we're waiting */
if ((now - last) > 1000) { /* every second */
putc ('.');
last = now;
}
iobarrier_rw();
}
DONE:
/* reset to read mode */
flash_reset (info->start[0]);
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 ulong addr = info->start[0];
ulong start;
int i;
/* Check if Flash is (sufficiently) erased */
if ((in32(dest) & data) != data) {
return (2);
}
/* write each byte out */
for (i = 0; i < 4; i++) {
char *data_ch = (char *)&data;
int flag = disable_interrupts();
out8(addr + 0x555, 0xAA);
iobarrier_rw();
out8(addr + 0x2AA, 0x55);
iobarrier_rw();
out8(addr + 0x555, 0xA0);
iobarrier_rw();
out8(dest+i, data_ch[i]);
iobarrier_rw();
/* re-enable interrupts if necessary */
if (flag)
enable_interrupts();
/* data polling for D7 */
start = get_timer (0);
while ((in8(dest+i) & 0x80) != (data_ch[i] & 0x80)) {
if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
flash_reset (addr);
return (1);
}
iobarrier_rw();
}
}
flash_reset (addr);
return (0);
}
/*
* Reset bank to read mode
*/
static void flash_reset (ulong addr)
{
out8(addr, 0xF0); /* reset bank */
iobarrier_rw();
}
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_AMD: printf ("AMD "); break;
case FLASH_MAN_FUJ: printf ("FUJITSU "); break;
case FLASH_MAN_BM: printf ("BRIGHT MICRO "); break;
case FLASH_MAN_STM: printf ("SGS THOMSON "); 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 % 0x100000 == 0) {
printf (" Size: %ld MB in %d Sectors\n",
info->size / 0x100000, info->sector_count);
} else if (info->size % 0x400 == 0) {
printf (" Size: %ld KB in %d Sectors\n",
info->size / 0x400, info->sector_count);
} else {
printf (" Size: %ld B in %d Sectors\n",
info->size, 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");
}
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