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uboot-1.1.4-kirkwood/board/eltec/elppc/flash.c

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u-boot 1.1.4
2024-01-07 23:57:24 +01:00
/*
* (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[CFG_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<CFG_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,
CFG_FLASH_BASE,
CFG_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)) > 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 = (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) > CFG_FLASH_WRITE_TOUT) {
return (1);
}
}
}
return (0);
}
/*----------------------------------------------------------------------------*/
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