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u-boot/board/trab/flash.c
Wolfgang Denk dfcd7f2160 Redundant Environment: protect full sector size 
Several boards used different ways to specify the size of the
protected area when enabling flash write protection for the sectors
holding the environment variables: some used CONFIG_ENV_SIZE and
CONFIG_ENV_SIZE_REDUND, some used CONFIG_ENV_SECT_SIZE, and some even
a mix of both for the "normal" and the "redundant" areas.

Normally, this makes no difference at all. However, things are
different when you have to deal with boards that can come with
different types of flash chips, which may have different sector
sizes.

Here we may have to chose CONFIG_ENV_SECT_SIZE such that it fits the
biggest sector size, which may include several sectors on boards using
the smaller sector flash types. In such a case, using CONFIG_ENV_SIZE
or CONFIG_ENV_SIZE_REDUND to enable the protection may lead to the
case that only the first of these sectors get protected, while the
following ones aren't.

This is no real problem, but it can be confusing for the user -
especially on boards that use CONFIG_ENV_SECT_SIZE to protect the
"normal" areas, while using CONFIG_ENV_SIZE_REDUND for the
"redundant" area.

To avoid such inconsistencies, I changed all sucn boards that I found
to consistently use CONFIG_ENV_SECT_SIZE for protection. This should
not cause any functional changes to the code.

Signed-off-by: Wolfgang Denk <wd@denx.de>
Cc: Paul Ruhland
Cc: Pantelis Antoniou <panto@intracom.gr>
Cc: Stefan Roese <sr@denx.de>
Cc: Gary Jennejohn <garyj@denx.de>
Cc: Dave Ellis <DGE@sixnetio.com>
Acked-by: Stefan Roese <sr@denx.de>
2009-06-04 00:16:16 +02:00

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/*
* (C) Copyright 2002
* Gary Jennejohn, DENX Software Engineering, <garyj@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
*/
/* #define DEBUG */
#include <common.h>
#include <environment.h>
static ulong flash_get_size (vu_long *addr, flash_info_t *info);
flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS];
#define CMD_READ_ARRAY 0x00F000F0
#define CMD_UNLOCK1 0x00AA00AA
#define CMD_UNLOCK2 0x00550055
#define CMD_ERASE_SETUP 0x00800080
#define CMD_ERASE_CONFIRM 0x00300030
#define CMD_PROGRAM 0x00A000A0
#define CMD_UNLOCK_BYPASS 0x00200020
#define CMD_READ_MANF_ID 0x00900090
#define CMD_UNLOCK_BYPASS_RES1 0x00900090
#define CMD_UNLOCK_BYPASS_RES2 0x00000000
#define MEM_FLASH_ADDR (*(volatile u32 *)CONFIG_SYS_FLASH_BASE)
#define MEM_FLASH_ADDR1 (*(volatile u32 *)(CONFIG_SYS_FLASH_BASE + (0x00000555 << 2)))
#define MEM_FLASH_ADDR2 (*(volatile u32 *)(CONFIG_SYS_FLASH_BASE + (0x000002AA << 2)))
#define BIT_ERASE_DONE 0x00800080
#define BIT_RDY_MASK 0x00800080
#define BIT_PROGRAM_ERROR 0x00200020
#define BIT_TIMEOUT 0x80000000 /* our flag */
#define READY 1
#define ERR 2
#define TMO 4
/*-----------------------------------------------------------------------
*/
ulong flash_init (void)
{
int i, j;
ulong size = 0;
for (i=0; i<CONFIG_SYS_MAX_FLASH_BANKS; ++i) {
ulong flashbase = 0;
flash_info_t *info = &flash_info[i];
/* Init: no FLASHes known */
info->flash_id = FLASH_UNKNOWN;
size += flash_get_size (CONFIG_SYS_FLASH_BASE, info);
if (i == 0)
flashbase = CONFIG_SYS_FLASH_BASE;
else
panic ("configured too many flash banks!\n");
for (j = 0; j < info->sector_count; j++) {
info->protect[j] = 0;
info->start[j] = flashbase;
switch (info->flash_id & FLASH_TYPEMASK) {
case (FLASH_AM320B & FLASH_TYPEMASK):
case (FLASH_MXLV320B & FLASH_TYPEMASK):
/* Boot sector type: 8 x 8 + N x 128 kB */
flashbase += (j < 8) ? 0x4000 : 0x20000;
break;
case (FLASH_AM640U & FLASH_TYPEMASK):
/* Uniform sector type: 128 kB */
flashbase += 0x20000;
break;
default:
printf ("## Bad flash chip type 0x%04lX\n",
info->flash_id & FLASH_TYPEMASK);
}
}
}
/*
* Protect monitor and environment sectors
*/
flash_protect ( FLAG_PROTECT_SET,
CONFIG_SYS_FLASH_BASE,
CONFIG_SYS_FLASH_BASE + monitor_flash_len - 1,
&flash_info[0]);
flash_protect ( FLAG_PROTECT_SET,
CONFIG_ENV_ADDR,
CONFIG_ENV_ADDR + CONFIG_ENV_SECT_SIZE - 1, &flash_info[0]);
#ifdef CONFIG_ENV_ADDR_REDUND
flash_protect ( FLAG_PROTECT_SET,
CONFIG_ENV_ADDR_REDUND,
CONFIG_ENV_ADDR_REDUND + CONFIG_ENV_SECT_SIZE - 1,
&flash_info[0]);
#endif
return size;
}
/*-----------------------------------------------------------------------
*/
void flash_print_info (flash_info_t * info)
{
int i;
switch (info->flash_id & FLASH_VENDMASK) {
case (FLASH_MAN_AMD & FLASH_VENDMASK):
printf ("AMD "); break;
case (FLASH_MAN_FUJ & FLASH_VENDMASK):
printf ("FUJITSU "); break;
case (FLASH_MAN_MX & FLASH_VENDMASK):
printf ("MACRONIX "); break;
default: printf ("Unknown Vendor "); break;
}
switch (info->flash_id & FLASH_TYPEMASK) {
case (FLASH_AM320B & FLASH_TYPEMASK):
printf ("2x Am29LV320DB (32Mbit)\n");
break;
case (FLASH_MXLV320B & FLASH_TYPEMASK):
printf ("2x MX29LV320DB (32Mbit)\n");
break;
case (FLASH_AM640U & FLASH_TYPEMASK):
printf ("2x Am29LV640D (64Mbit)\n");
break;
default:
printf ("Unknown Chip Type\n");
goto Done;
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");
Done: ;
}
/*-----------------------------------------------------------------------
*/
int flash_erase (flash_info_t * info, int s_first, int s_last)
{
ulong result;
#if 0
int cflag;
#endif
int iflag, prot, sect;
int rc = ERR_OK;
int chip1, chip2;
debug ("flash_erase: s_first %d s_last %d\n", s_first, s_last);
/* first look for protection bits */
if (info->flash_id == FLASH_UNKNOWN)
return ERR_UNKNOWN_FLASH_TYPE;
if ((s_first < 0) || (s_first > s_last)) {
return ERR_INVAL;
}
switch (info->flash_id & FLASH_VENDMASK) {
case (FLASH_MAN_AMD & FLASH_VENDMASK): break; /* OK */
case (FLASH_MAN_FUJ & FLASH_VENDMASK): break; /* OK */
case (FLASH_MAN_MX & FLASH_VENDMASK): break; /* OK */
default:
debug ("## flash_erase: unknown manufacturer\n");
return (ERR_UNKNOWN_FLASH_VENDOR);
}
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");
}
/*
* Disable interrupts which might cause a timeout
* here. Remember that our exception vectors are
* at address 0 in the flash, and we don't want a
* (ticker) exception to happen while the flash
* chip is in programming mode.
*/
#if 0
cflag = icache_status ();
icache_disable ();
#endif
iflag = disable_interrupts ();
/* Start erase on unprotected sectors */
for (sect = s_first; sect <= s_last && !ctrlc (); sect++) {
debug ("Erasing sector %2d @ %08lX... ",
sect, info->start[sect]);
/* arm simple, non interrupt dependent timer */
reset_timer_masked ();
if (info->protect[sect] == 0) { /* not protected */
vu_long *addr = (vu_long *) (info->start[sect]);
MEM_FLASH_ADDR1 = CMD_UNLOCK1;
MEM_FLASH_ADDR2 = CMD_UNLOCK2;
MEM_FLASH_ADDR1 = CMD_ERASE_SETUP;
MEM_FLASH_ADDR1 = CMD_UNLOCK1;
MEM_FLASH_ADDR2 = CMD_UNLOCK2;
*addr = CMD_ERASE_CONFIRM;
/* wait until flash is ready */
chip1 = chip2 = 0;
do {
result = *addr;
/* check timeout */
if (get_timer_masked () > CONFIG_SYS_FLASH_ERASE_TOUT) {
MEM_FLASH_ADDR1 = CMD_READ_ARRAY;
chip1 = TMO;
break;
}
if (!chip1 && (result & 0xFFFF) & BIT_ERASE_DONE)
chip1 = READY;
if (!chip1 && (result & 0xFFFF) & BIT_PROGRAM_ERROR)
chip1 = ERR;
if (!chip2 && (result >> 16) & BIT_ERASE_DONE)
chip2 = READY;
if (!chip2 && (result >> 16) & BIT_PROGRAM_ERROR)
chip2 = ERR;
} while (!chip1 || !chip2);
MEM_FLASH_ADDR1 = CMD_READ_ARRAY;
if (chip1 == ERR || chip2 == ERR) {
rc = ERR_PROG_ERROR;
printf ("Flash erase error\n");
goto outahere;
}
if (chip1 == TMO) {
rc = ERR_TIMOUT;
printf ("Flash erase timeout error\n");
goto outahere;
}
}
}
outahere:
/* allow flash to settle - wait 10 ms */
udelay_masked (10000);
if (iflag)
enable_interrupts ();
#if 0
if (cflag)
icache_enable ();
#endif
return rc;
}
/*-----------------------------------------------------------------------
* Copy memory to flash
*/
static int write_word (flash_info_t * info, ulong dest, ulong data)
{
vu_long *addr = (vu_long *) dest;
ulong result;
int rc = ERR_OK;
#if 0
int cflag;
#endif
int iflag;
int chip1, chip2;
/*
* Check if Flash is (sufficiently) erased
*/
result = *addr;
if ((result & data) != data)
return ERR_NOT_ERASED;
/*
* Disable interrupts which might cause a timeout
* here. Remember that our exception vectors are
* at address 0 in the flash, and we don't want a
* (ticker) exception to happen while the flash
* chip is in programming mode.
*/
#if 0
cflag = icache_status ();
icache_disable ();
#endif
iflag = disable_interrupts ();
MEM_FLASH_ADDR1 = CMD_UNLOCK1;
MEM_FLASH_ADDR2 = CMD_UNLOCK2;
MEM_FLASH_ADDR1 = CMD_PROGRAM;
*addr = data;
/* arm simple, non interrupt dependent timer */
reset_timer_masked ();
/* wait until flash is ready */
chip1 = chip2 = 0;
do {
result = *addr;
/* check timeout */
if (get_timer_masked () > CONFIG_SYS_FLASH_WRITE_TOUT) {
chip1 = ERR | TMO;
break;
}
if (!chip1 && ((result & 0x80) == (data & 0x80)))
chip1 = READY;
if (!chip1 && ((result & 0xFFFF) & BIT_PROGRAM_ERROR)) {
result = *addr;
if ((result & 0x80) == (data & 0x80))
chip1 = READY;
else
chip1 = ERR;
}
if (!chip2 && ((result & (0x80 << 16)) == (data & (0x80 << 16))))
chip2 = READY;
if (!chip2 && ((result >> 16) & BIT_PROGRAM_ERROR)) {
result = *addr;
if ((result & (0x80 << 16)) == (data & (0x80 << 16)))
chip2 = READY;
else
chip2 = ERR;
}
} while (!chip1 || !chip2);
*addr = CMD_READ_ARRAY;
if (chip1 == ERR || chip2 == ERR || *addr != data) {
rc = ERR_PROG_ERROR;
printf ("Flash program error\n");
debug ("chip1: %#x, chip2: %#x, addr: %#lx *addr: %#lx, "
"data: %#lx\n",
chip1, chip2, addr, *addr, data);
}
if (iflag)
enable_interrupts ();
#if 0
if (cflag)
icache_enable ();
#endif
return rc;
}
/*-----------------------------------------------------------------------
* Copy memory to flash.
*/
int write_buff (flash_info_t * info, uchar * src, ulong addr, ulong cnt)
{
ulong cp, wp, data;
int l;
int i, 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 << 24);
}
for (; i < 4 && cnt > 0; ++i) {
data = (data >> 8) | (*src++ << 24);
--cnt;
++cp;
}
for (; cnt == 0 && i < 4; ++i, ++cp) {
data = (data >> 8) | (*(uchar *) cp << 24);
}
if ((rc = write_word (info, wp, data)) != 0) {
goto Done;
}
wp += 4;
}
/*
* handle word aligned part
*/
while (cnt >= 4) {
if (((ulong)src) & 0x3) {
for (i = 0; i < 4; i++) {
((char *)&data)[i] = ((vu_char *)src)[i];
}
}
else {
data = *((vu_long *) src);
}
if ((rc = write_word (info, wp, data)) != 0) {
goto Done;
}
src += 4;
wp += 4;
cnt -= 4;
}
if (cnt == 0) {
rc = ERR_OK;
goto Done;
}
/*
* handle unaligned tail bytes
*/
data = 0;
for (i = 0, cp = wp; i < 4 && cnt > 0; ++i, ++cp) {
data = (data >> 8) | (*src++ << 24);
--cnt;
}
for (; i < 4; ++i, ++cp) {
data = (data >> 8) | (*(uchar *) cp << 24);
}
rc = write_word (info, wp, data);
Done:
return (rc);
}
/*-----------------------------------------------------------------------
*/
static ulong flash_get_size (vu_long *addr, flash_info_t *info)
{
ulong value;
/* Write auto select command sequence and read Manufacturer ID */
addr[0x0555] = CMD_UNLOCK1;
addr[0x02AA] = CMD_UNLOCK2;
addr[0x0555] = CMD_READ_MANF_ID;
value = addr[0];
debug ("Manuf. ID @ 0x%08lx: 0x%08lx\n", (ulong)addr, value);
switch (value) {
case AMD_MANUFACT:
info->flash_id = FLASH_MAN_AMD;
break;
case FUJ_MANUFACT:
info->flash_id = FLASH_MAN_FUJ;
break;
case MX_MANUFACT:
info->flash_id = FLASH_MAN_MX;
break;
default:
info->flash_id = FLASH_UNKNOWN;
info->sector_count = 0;
info->size = 0;
addr[0] = CMD_READ_ARRAY; /* restore read mode */
debug ("## flash_init: unknown manufacturer\n");
return (0); /* no or unknown flash */
}
value = addr[1]; /* device ID */
debug ("Device ID @ 0x%08lx: 0x%08lx\n", (ulong)(&addr[1]), value);
switch (value) {
case AMD_ID_LV320B:
info->flash_id += FLASH_AM320B;
info->sector_count = 71;
info->size = 0x00800000;
addr[0] = CMD_READ_ARRAY; /* restore read mode */
break; /* => 8 MB */
case AMD_ID_LV640U:
info->flash_id += FLASH_AM640U;
info->sector_count = 128;
info->size = 0x01000000;
addr[0] = CMD_READ_ARRAY; /* restore read mode */
break; /* => 16 MB */
case MX_ID_LV320B:
info->flash_id += FLASH_MXLV320B;
info->sector_count = 71;
info->size = 0x00800000;
addr[0] = CMD_READ_ARRAY; /* restore read mode */
break; /* => 8 MB */
default:
debug ("## flash_init: unknown flash chip\n");
info->flash_id = FLASH_UNKNOWN;
addr[0] = CMD_READ_ARRAY; /* restore read mode */
return (0); /* => no or unknown flash */
}
if (info->sector_count > CONFIG_SYS_MAX_FLASH_SECT) {
printf ("** ERROR: sector count %d > max (%d) **\n",
info->sector_count, CONFIG_SYS_MAX_FLASH_SECT);
info->sector_count = CONFIG_SYS_MAX_FLASH_SECT;
}
return (info->size);
}
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