u-boot/board/rbc823/flash.c
Wolfgang Denk e0ead84895 board/rbc823/flash.c: Fix flash initalization
The RBC823 has only one NOR flash bank.  Remove all code trying to
deal with a second bank.  This also fixes a number of GCC 4.6 build
warnings:
flash.c: In function 'flash_init':
flash.c:62:12: warning: array subscript is above array bounds
[-Warray-bounds]
flash.c:63:12: warning: array subscript is above array bounds
[-Warray-bounds]
flash.c:66:12: warning: array subscript is above array bounds
[-Warray-bounds]

Signed-off-by: Wolfgang Denk <wd@denx.de>
2011-11-07 22:15:31 +01:00

462 lines
9.5 KiB
C

/*
* (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
*/
#include <common.h>
#include <mpc8xx.h>
flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS];
/*
* Functions
*/
static ulong flash_get_size(vu_long *addr, flash_info_t *info);
static int write_word(flash_info_t *info, ulong dest, ulong data);
static void flash_get_offsets(ulong base, flash_info_t *info);
unsigned long flash_init(void)
{
unsigned long size_b0;
int i;
/* Init: no FLASHes known */
for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; ++i)
flash_info[i].flash_id = FLASH_UNKNOWN;
/* Detect size */
size_b0 = flash_get_size((vu_long *)CONFIG_SYS_FLASH_BASE,
&flash_info[0]);
/* Setup offsets */
flash_get_offsets(CONFIG_SYS_FLASH_BASE, &flash_info[0]);
#if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE
/* Monitor protection ON by default */
flash_protect(FLAG_PROTECT_SET,
CONFIG_SYS_MONITOR_BASE,
CONFIG_SYS_MONITOR_BASE+monitor_flash_len-1,
&flash_info[0]);
#endif
flash_info[0].size = size_b0;
return size_b0;
}
/*-----------------------------------------------------------------------
* Fix this to support variable sector sizes
*/
static void flash_get_offsets(ulong base, flash_info_t *info)
{
int i;
/* set up sector start address table */
if ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM040) {
/* set sector offsets for bottom boot block type */
for (i = 0; i < info->sector_count; i++)
info->start[i] = base + (i * 0x00010000);
}
}
/*-----------------------------------------------------------------------
*/
void flash_print_info(flash_info_t *info)
{
int i;
if (info->flash_id == FLASH_UNKNOWN) {
puts("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;
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 >> 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);
}
puts(" Sector Start Addresses:");
for (i = 0; i < info->sector_count; ++i) {
if ((i % 5) == 0)
puts("\n ");
printf(" %08lX%s",
info->start[i],
info->protect[i] ? " (RO)" : " ");
}
putc('\n');
return;
}
/*
* The following code cannot be run from FLASH!
*/
static ulong flash_get_size(vu_long *addr, flash_info_t *info)
{
short i;
volatile unsigned char *caddr;
char value;
caddr = (volatile unsigned char *)addr ;
/* Write auto select command: read Manufacturer ID */
debug("Base address is: %8p\n", caddr);
caddr[0x0555] = 0xAA;
caddr[0x02AA] = 0x55;
caddr[0x0555] = 0x90;
value = caddr[0];
debug("Manufact ID: %02x\n", value);
switch (value) {
case 0x01: /*AMD_MANUFACT*/
info->flash_id = FLASH_MAN_AMD;
break;
case 0x04: /*FUJ_MANUFACT*/
info->flash_id = FLASH_MAN_FUJ;
break;
default:
info->flash_id = FLASH_UNKNOWN;
info->sector_count = 0;
info->size = 0;
break;
}
value = caddr[1]; /* device ID */
debug("Device ID: %02x\n", value);
switch (value) {
case AMD_ID_LV040B:
info->flash_id += FLASH_AM040;
info->sector_count = 8;
info->size = 0x00080000;
break; /* => 512Kb */
default:
info->flash_id = FLASH_UNKNOWN;
return 0; /* => no or unknown flash */
}
flash_get_offsets((ulong)addr, &flash_info[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
*/
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 = 0xF0; /* reset bank */
}
return info->size;
}
int flash_erase(flash_info_t *info, int s_first, int s_last)
{
volatile unsigned char *addr =
(volatile unsigned 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;
}
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[0x0555] = 0xAA;
addr[0x02AA] = 0x55;
addr[0x0555] = 0x80;
addr[0x0555] = 0xAA;
addr[0x02AA] = 0x55;
/* Start erase on unprotected sectors */
for (sect = s_first; sect <= s_last; sect++) {
if (info->protect[sect] == 0) { /* not protected */
addr = (volatile unsigned 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 = (volatile unsigned char *)(info->start[l_sect]);
while ((addr[0] & 0xFF) != 0xFF) {
now = get_timer(start);
if (now > CONFIG_SYS_FLASH_ERASE_TOUT) {
printf("Timeout\n");
return 1;
}
/* show that we're waiting */
if ((now - last) > 1000) { /* every second */
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)
{
ulong cp, wp, data;
int i, l, rc;
wp = (addr & ~3); /* get lower word aligned address */
/*
* handle unaligned start bytes
*/
l = addr - wp;
if (l != 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);
rc = write_word(info, wp, data);
if (rc != 0)
return rc;
wp += 4;
}
/*
* handle word aligned part
*/
while (cnt >= 4) {
data = 0;
for (i = 0; i < 4; ++i)
data = (data << 8) | *src++;
rc = write_word(info, wp, data);
if (rc != 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 unsigned char *cdest, *cdata;
volatile unsigned char *addr =
(volatile unsigned char *)(info->start[0]);
ulong start;
int flag, count = 4 ;
cdest = (volatile unsigned char *)dest ;
cdata = (volatile unsigned char *)&data ;
/* Check if Flash is (sufficiently) erased */
if ((*((vu_long *)dest)&data) != data)
return 2;
while (count--) {
/* Disable interrupts which might cause a timeout here */
flag = disable_interrupts();
addr[0x0555] = 0xAA;
addr[0x02AA] = 0x55;
addr[0x0555] = 0xA0;
*cdest = *cdata;
/* re-enable interrupts if necessary */
if (flag)
enable_interrupts();
/* data polling for D7 */
start = get_timer(0);
while ((*cdest ^ *cdata) & 0x80) {
if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT)
return 1;
}
cdata++ ;
cdest++ ;
}
return 0;
}