mirror of
https://github.com/smaeul/u-boot.git
synced 2025-11-03 21:48:15 +00:00
645 lines
16 KiB
C
645 lines
16 KiB
C
/*
|
|
* (C) Copyright 2001
|
|
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
|
|
* Keith Outwater, keith_outwater@mvsi.com
|
|
*
|
|
* 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>
|
|
|
|
#if defined(CONFIG_ENV_IS_IN_FLASH)
|
|
# ifndef CONFIG_ENV_ADDR
|
|
# define CONFIG_ENV_ADDR (CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET)
|
|
# endif
|
|
# ifndef CONFIG_ENV_SIZE
|
|
# define CONFIG_ENV_SIZE CONFIG_ENV_SECT_SIZE
|
|
# endif
|
|
# ifndef CONFIG_ENV_SECT_SIZE
|
|
# define CONFIG_ENV_SECT_SIZE CONFIG_ENV_SIZE
|
|
# endif
|
|
#endif
|
|
|
|
/*
|
|
* Use buffered writes to flash by default - they are about 32x faster than
|
|
* single byte writes.
|
|
*/
|
|
#ifndef CONFIG_SYS_GEN860T_FLASH_USE_WRITE_BUFFER
|
|
#define CONFIG_SYS_GEN860T_FLASH_USE_WRITE_BUFFER
|
|
#endif
|
|
|
|
/*
|
|
* Max time to wait (in mS) for flash device to allocate a write buffer.
|
|
*/
|
|
#ifndef CONFIG_SYS_FLASH_ALLOC_BUFFER_TOUT
|
|
#define CONFIG_SYS_FLASH_ALLOC_BUFFER_TOUT 100
|
|
#endif
|
|
|
|
/*
|
|
* These functions support a single Intel StrataFlash device (28F128J3A)
|
|
* in byte mode only!. The flash routines are very basic and simple
|
|
* since there isn't really any remapping necessary.
|
|
*/
|
|
|
|
/*
|
|
* Intel SCS (Scalable Command Set) command definitions
|
|
* (taken from 28F128J3A datasheet)
|
|
*/
|
|
#define SCS_READ_CMD 0xff
|
|
#define SCS_READ_ID_CMD 0x90
|
|
#define SCS_QUERY_CMD 0x98
|
|
#define SCS_READ_STATUS_CMD 0x70
|
|
#define SCS_CLEAR_STATUS_CMD 0x50
|
|
#define SCS_WRITE_BUF_CMD 0xe8
|
|
#define SCS_PROGRAM_CMD 0x40
|
|
#define SCS_BLOCK_ERASE_CMD 0x20
|
|
#define SCS_BLOCK_ERASE_RESUME_CMD 0xd0
|
|
#define SCS_PROGRAM_RESUME_CMD 0xd0
|
|
#define SCS_BLOCK_ERASE_SUSPEND_CMD 0xb0
|
|
#define SCS_SET_BLOCK_LOCK_CMD 0x60
|
|
#define SCS_CLR_BLOCK_LOCK_CMD 0x60
|
|
|
|
/*
|
|
* SCS status/extended status register bit definitions
|
|
*/
|
|
#define SCS_SR7 0x80
|
|
#define SCS_XSR7 0x80
|
|
|
|
/*---------------------------------------------------------------------*/
|
|
#if 0
|
|
#define DEBUG_FLASH
|
|
#endif
|
|
|
|
#ifdef DEBUG_FLASH
|
|
#define PRINTF(fmt,args...) printf(fmt ,##args)
|
|
#else
|
|
#define PRINTF(fmt,args...)
|
|
#endif
|
|
/*---------------------------------------------------------------------*/
|
|
|
|
flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS];
|
|
|
|
/*-----------------------------------------------------------------------
|
|
* Functions
|
|
*/
|
|
static ulong flash_get_size (vu_char *addr, flash_info_t *info);
|
|
static int write_data8 (flash_info_t *info, ulong dest, uchar data);
|
|
static void flash_get_offsets (ulong base, flash_info_t *info);
|
|
|
|
/*-----------------------------------------------------------------------
|
|
* Initialize the flash memory.
|
|
*/
|
|
unsigned long
|
|
flash_init (void)
|
|
{
|
|
volatile immap_t *immap = (immap_t *)CONFIG_SYS_IMMR;
|
|
volatile memctl8xx_t *memctl = &immap->im_memctl;
|
|
unsigned long size_b0;
|
|
int i;
|
|
|
|
for (i= 0; i < CONFIG_SYS_MAX_FLASH_BANKS; ++i) {
|
|
flash_info[i].flash_id = FLASH_UNKNOWN;
|
|
}
|
|
|
|
/*
|
|
* The gen860t board only has one FLASH memory device, so the
|
|
* FLASH Bank configuration is done statically.
|
|
*/
|
|
PRINTF("\n## Get flash bank 1 size @ 0x%08x\n", FLASH_BASE0_PRELIM);
|
|
size_b0 = flash_get_size((vu_char *)FLASH_BASE0_PRELIM, &flash_info[0]);
|
|
if (flash_info[0].flash_id == FLASH_UNKNOWN) {
|
|
printf ("## Unknown FLASH on Bank 0: "
|
|
"ID 0x%lx, Size = 0x%08lx = %ld MB\n",
|
|
flash_info[0].flash_id,size_b0, size_b0 << 20);
|
|
}
|
|
|
|
PRINTF("## Before remap:\n"
|
|
" BR0: 0x%08x OR0: 0x%08x\n BR1: 0x%08x OR1: 0x%08x\n",
|
|
memctl->memc_br0, memctl->memc_or0,
|
|
memctl->memc_br1, memctl->memc_or1);
|
|
|
|
/*
|
|
* Remap FLASH according to real size
|
|
*/
|
|
memctl->memc_or0 |= (-size_b0 & 0xFFFF8000);
|
|
memctl->memc_br0 |= (CONFIG_SYS_FLASH_BASE & BR_BA_MSK);
|
|
|
|
PRINTF("## After remap:\n"
|
|
" BR0: 0x%08x OR0: 0x%08x\n", memctl->memc_br0, memctl->memc_or0);
|
|
|
|
/*
|
|
* Re-do sizing to get full correct info
|
|
*/
|
|
size_b0 = flash_get_size ((vu_char *)CONFIG_SYS_FLASH_BASE, &flash_info[0]);
|
|
flash_get_offsets (CONFIG_SYS_FLASH_BASE, &flash_info[0]);
|
|
flash_info[0].size = size_b0;
|
|
|
|
#if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE
|
|
/*
|
|
* Monitor protection is ON by default
|
|
*/
|
|
flash_protect(FLAG_PROTECT_SET,
|
|
CONFIG_SYS_MONITOR_BASE,
|
|
CONFIG_SYS_MONITOR_BASE + monitor_flash_len - 1,
|
|
&flash_info[0]);
|
|
#endif
|
|
|
|
#ifdef CONFIG_ENV_IS_IN_FLASH
|
|
/*
|
|
* Environment protection ON by default
|
|
*/
|
|
flash_protect(FLAG_PROTECT_SET,
|
|
CONFIG_ENV_ADDR,
|
|
CONFIG_ENV_ADDR + CONFIG_ENV_SECT_SIZE - 1,
|
|
&flash_info[0]);
|
|
#endif
|
|
|
|
PRINTF("## Final Flash bank size: 0x%08lx\n",size_b0);
|
|
return (size_b0);
|
|
}
|
|
|
|
|
|
/*-----------------------------------------------------------------------
|
|
* Fill in the FLASH offset table
|
|
*/
|
|
static void
|
|
flash_get_offsets (ulong base, flash_info_t *info)
|
|
{
|
|
int i;
|
|
|
|
if (info->flash_id == FLASH_UNKNOWN) {
|
|
return;
|
|
}
|
|
|
|
switch (info->flash_id & FLASH_VENDMASK) {
|
|
case FLASH_MAN_INTEL:
|
|
for (i = 0; i < info->sector_count; i++) {
|
|
info->start[i] = base;
|
|
base += 1024 * 128;
|
|
}
|
|
return;
|
|
|
|
default:
|
|
printf ("Don't know sector offsets for FLASH"
|
|
" type 0x%lx\n", info->flash_id);
|
|
return;
|
|
}
|
|
}
|
|
|
|
|
|
/*-----------------------------------------------------------------------
|
|
* Display FLASH device info
|
|
*/
|
|
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_INTEL:
|
|
printf ("Intel ");
|
|
break;
|
|
default:
|
|
printf ("Unknown Vendor ");
|
|
break;
|
|
}
|
|
|
|
switch (info->flash_id & FLASH_TYPEMASK) {
|
|
case FLASH_28F128J3A:
|
|
printf ("28F128J3A (128Mbit = 128K x 128)\n");
|
|
break;
|
|
default:
|
|
printf ("Unknown Chip Type\n");
|
|
break;
|
|
}
|
|
|
|
if (info->size >= (1024 * 1024)) {
|
|
i = 20;
|
|
} else {
|
|
i = 10;
|
|
}
|
|
printf (" Size: %ld %cB in %d Sectors\n",
|
|
info->size >> i,
|
|
(i == 20) ? 'M' : 'k',
|
|
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;
|
|
}
|
|
|
|
|
|
/*-----------------------------------------------------------------------
|
|
* Get size and other information for a FLASH device.
|
|
* NOTE: The following code cannot be run from FLASH!
|
|
*/
|
|
static
|
|
ulong flash_get_size (vu_char *addr, flash_info_t *info)
|
|
{
|
|
#define NO_FLASH 0
|
|
|
|
vu_char value[2];
|
|
|
|
/*
|
|
* Try to read the manufacturer ID
|
|
*/
|
|
addr[0] = SCS_READ_CMD;
|
|
addr[0] = SCS_READ_ID_CMD;
|
|
value[0] = addr[0];
|
|
value[1] = addr[2];
|
|
addr[0] = SCS_READ_CMD;
|
|
|
|
PRINTF("Manuf. ID @ 0x%08lx: 0x%02x\n", (ulong)addr, value[0]);
|
|
switch (value[0]) {
|
|
case (INTEL_MANUFACT & 0xff):
|
|
info->flash_id = FLASH_MAN_INTEL;
|
|
break;
|
|
default:
|
|
info->flash_id = FLASH_UNKNOWN;
|
|
info->sector_count = 0;
|
|
info->size = 0;
|
|
return (NO_FLASH);
|
|
}
|
|
|
|
/*
|
|
* Read the device ID
|
|
*/
|
|
PRINTF("Device ID @ 0x%08lx: 0x%02x\n", (ulong)(&addr[2]), value[1]);
|
|
switch (value[1]) {
|
|
case (INTEL_ID_28F128J3A & 0xff):
|
|
info->flash_id += FLASH_28F128J3A;
|
|
info->sector_count = 128;
|
|
info->size = 16 * 1024 * 1024;
|
|
break;
|
|
|
|
default:
|
|
info->flash_id = FLASH_UNKNOWN;
|
|
return (NO_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);
|
|
}
|
|
|
|
|
|
/*-----------------------------------------------------------------------
|
|
* Erase the specified sectors in the specified FLASH device
|
|
*/
|
|
int
|
|
flash_erase(flash_info_t *info, int s_first, int s_last)
|
|
{
|
|
int flag, prot, 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_VENDMASK) != FLASH_MAN_INTEL) {
|
|
printf ("Can erase only Intel flash types - 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");
|
|
}
|
|
|
|
start = get_timer (0);
|
|
last = start;
|
|
|
|
/*
|
|
* Start erase on unprotected sectors
|
|
*/
|
|
for (sect = s_first; sect<=s_last; sect++) {
|
|
if (info->protect[sect] == 0) { /* not protected */
|
|
vu_char *addr = (uchar *)(info->start[sect]);
|
|
vu_char status;
|
|
|
|
/*
|
|
* Disable interrupts which might cause a timeout
|
|
*/
|
|
flag = disable_interrupts();
|
|
|
|
*addr = SCS_CLEAR_STATUS_CMD;
|
|
*addr = SCS_BLOCK_ERASE_CMD;
|
|
*addr = SCS_BLOCK_ERASE_RESUME_CMD;
|
|
|
|
/*
|
|
* Re-enable interrupts if necessary
|
|
*/
|
|
if (flag)
|
|
enable_interrupts();
|
|
|
|
/*
|
|
* Wait at least 80us - let's wait 1 ms
|
|
*/
|
|
udelay (1000);
|
|
|
|
while (((status = *addr) & SCS_SR7) != SCS_SR7) {
|
|
if ((now=get_timer(start)) > CONFIG_SYS_FLASH_ERASE_TOUT) {
|
|
printf ("Timeout\n");
|
|
*addr = SCS_BLOCK_ERASE_SUSPEND_CMD;
|
|
*addr = SCS_READ_CMD;
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Show that we're waiting
|
|
*/
|
|
if ((now - last) > 1000) { /* 1 second */
|
|
putc ('.');
|
|
last = now;
|
|
}
|
|
}
|
|
*addr = SCS_READ_CMD;
|
|
}
|
|
}
|
|
printf (" done\n");
|
|
return 0;
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_SYS_GEN860T_FLASH_USE_WRITE_BUFFER
|
|
/*
|
|
* Allocate a flash buffer, fill it with data and write it to the flash.
|
|
* 0 - OK
|
|
* 1 - Timeout on buffer request
|
|
*
|
|
* NOTE: After the last call to this function, WSM status needs to be checked!
|
|
*/
|
|
static int
|
|
write_flash_buffer8(flash_info_t *info_p, vu_char *src_p, vu_char *dest_p,
|
|
uint count)
|
|
{
|
|
vu_char *block_addr_p = NULL;
|
|
vu_char *start_addr_p = NULL;
|
|
ulong blocksize = info_p->size / (ulong)info_p->sector_count;
|
|
|
|
int i;
|
|
uint time = get_timer(0);
|
|
|
|
PRINTF("%s:%d: src: 0x%p dest: 0x%p count: %d\n",
|
|
__FUNCTION__, __LINE__, src_p, dest_p, count);
|
|
|
|
/*
|
|
* What block are we in? We already know that the source address is
|
|
* in the flash address range, but we also can't cross a block boundary.
|
|
* We assume that the block does not cross a boundary (we'll check before
|
|
* calling this function).
|
|
*/
|
|
for (i = 0; i < info_p->sector_count; ++i) {
|
|
if ( ((ulong)dest_p >= info_p->start[i]) &&
|
|
((ulong)dest_p < (info_p->start[i] + blocksize)) ) {
|
|
PRINTF("%s:%d: Dest addr 0x%p is in block %d @ 0x%.8lx\n",
|
|
__FUNCTION__, __LINE__, dest_p, i, info_p->start[i]);
|
|
block_addr_p = (vu_char *)info_p->start[i];
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Request a buffer
|
|
*/
|
|
*block_addr_p = SCS_WRITE_BUF_CMD;
|
|
while ((*block_addr_p & SCS_XSR7) != SCS_XSR7) {
|
|
if (get_timer(time) > CONFIG_SYS_FLASH_ALLOC_BUFFER_TOUT) {
|
|
PRINTF("%s:%d: Buffer allocation timeout @ 0x%p (waited %d mS)\n",
|
|
__FUNCTION__, __LINE__, block_addr_p,
|
|
CONFIG_SYS_FLASH_ALLOC_BUFFER_TOUT);
|
|
return 1;
|
|
}
|
|
*block_addr_p = SCS_WRITE_BUF_CMD;
|
|
}
|
|
|
|
/*
|
|
* Fill the buffer with data
|
|
*/
|
|
start_addr_p = dest_p;
|
|
*block_addr_p = count - 1; /* flash device wants count - 1 */
|
|
PRINTF("%s:%d: Fill buffer at block addr 0x%p\n",
|
|
__FUNCTION__, __LINE__, block_addr_p);
|
|
for (i = 0; i < count; i++) {
|
|
*start_addr_p++ = *src_p++;
|
|
}
|
|
|
|
/*
|
|
* Flush buffer to flash
|
|
*/
|
|
*block_addr_p = SCS_PROGRAM_RESUME_CMD;
|
|
#if 1
|
|
time = get_timer(0);
|
|
while ((*block_addr_p & SCS_SR7) != SCS_SR7) {
|
|
if (get_timer(time) > CONFIG_SYS_FLASH_WRITE_TOUT) {
|
|
PRINTF("%s:%d: Write timeout @ 0x%p (waited %d mS)\n",
|
|
__FUNCTION__, __LINE__, block_addr_p, CONFIG_SYS_FLASH_WRITE_TOUT);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
#endif
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
|
|
/*-----------------------------------------------------------------------
|
|
* Copy memory to flash, returns:
|
|
* 0 - OK
|
|
* 1 - write timeout
|
|
* 2 - Flash not erased
|
|
* 4 - Flash not identified
|
|
*/
|
|
int
|
|
write_buff(flash_info_t *info_p, uchar *src_p, ulong addr, ulong count)
|
|
{
|
|
int rc = 0;
|
|
#ifdef CONFIG_SYS_GEN860T_FLASH_USE_WRITE_BUFFER
|
|
#define FLASH_WRITE_BUF_SIZE 0x00000020 /* 32 bytes */
|
|
int i;
|
|
uint bufs;
|
|
ulong buf_count;
|
|
vu_char *sp;
|
|
vu_char *dp;
|
|
#else
|
|
ulong wp;
|
|
#endif
|
|
|
|
PRINTF("\n%s:%d: src: 0x%.8lx dest: 0x%.8lx size: %d (0x%.8lx)\n",
|
|
__FUNCTION__, __LINE__, (ulong)src_p, addr, (uint)count, count);
|
|
|
|
if (info_p->flash_id == FLASH_UNKNOWN) {
|
|
return 4;
|
|
}
|
|
|
|
#ifdef CONFIG_SYS_GEN860T_FLASH_USE_WRITE_BUFFER
|
|
sp = src_p;
|
|
dp = (uchar *)addr;
|
|
|
|
/*
|
|
* For maximum performance, we want to align the start address to
|
|
* the beginning of a write buffer boundary (i.e. A4-A0 of the
|
|
* start address = 0). See how many bytes are required to get to a
|
|
* write-buffer-aligned address. If that number is non-zero, do
|
|
* non buffered writes of the non-aligned data. By doing non-buffered
|
|
* writes, we avoid the problem of crossing a block (sector) boundary
|
|
* with buffered writes.
|
|
*/
|
|
buf_count = FLASH_WRITE_BUF_SIZE - (addr & (FLASH_WRITE_BUF_SIZE - 1));
|
|
if (buf_count == FLASH_WRITE_BUF_SIZE) { /* already on a boundary */
|
|
buf_count = 0;
|
|
}
|
|
if (buf_count > count) { /* not a full buffers worth of data to write */
|
|
buf_count = count;
|
|
}
|
|
count -= buf_count;
|
|
|
|
PRINTF("%s:%d: Write buffer alignment count = %ld\n",
|
|
__FUNCTION__, __LINE__, buf_count);
|
|
while (buf_count-- >= 1) {
|
|
if ((rc = write_data8(info_p, (ulong)dp++, *sp++)) != 0) {
|
|
return (rc);
|
|
}
|
|
}
|
|
|
|
PRINTF("%s:%d: count = %ld\n", __FUNCTION__, __LINE__, count);
|
|
if (count == 0) { /* all done */
|
|
PRINTF("%s:%d: Less than 1 buffer (%d) worth of bytes\n",
|
|
__FUNCTION__, __LINE__, FLASH_WRITE_BUF_SIZE);
|
|
return (rc);
|
|
}
|
|
|
|
/*
|
|
* Now that we are write buffer aligned, write full or partial buffers.
|
|
* The fact that we are write buffer aligned automatically avoids
|
|
* crossing a block address during a write buffer operation.
|
|
*/
|
|
bufs = count / FLASH_WRITE_BUF_SIZE;
|
|
PRINTF("%s:%d: %d (0x%x) buffers to write\n", __FUNCTION__, __LINE__,
|
|
bufs, bufs);
|
|
while (bufs >= 1) {
|
|
rc = write_flash_buffer8(info_p, sp, dp, FLASH_WRITE_BUF_SIZE);
|
|
if (rc != 0) {
|
|
PRINTF("%s:%d: ** Error writing buf %d\n",
|
|
__FUNCTION__, __LINE__, bufs);
|
|
return (rc);
|
|
}
|
|
bufs--;
|
|
sp += FLASH_WRITE_BUF_SIZE;
|
|
dp += FLASH_WRITE_BUF_SIZE;
|
|
}
|
|
|
|
/*
|
|
* Do the leftovers
|
|
*/
|
|
i = count % FLASH_WRITE_BUF_SIZE;
|
|
PRINTF("%s:%d: %d (0x%x) leftover bytes\n", __FUNCTION__, __LINE__, i, i);
|
|
if (i > 0) {
|
|
rc = write_flash_buffer8(info_p, sp, dp, i);
|
|
}
|
|
|
|
sp = (vu_char*)info_p->start[0];
|
|
*sp = SCS_READ_CMD;
|
|
return (rc);
|
|
|
|
#else
|
|
wp = addr;
|
|
while (count-- >= 1) {
|
|
if((rc = write_data8(info_p, wp++, *src_p++)) != 0)
|
|
return (rc);
|
|
}
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
|
|
/*-----------------------------------------------------------------------
|
|
* Write a byte to Flash, returns:
|
|
* 0 - OK
|
|
* 1 - write timeout
|
|
* 2 - Flash not erased
|
|
*/
|
|
static int
|
|
write_data8 (flash_info_t *info, ulong dest, uchar data)
|
|
{
|
|
vu_char *addr = (vu_char *)dest;
|
|
vu_char status;
|
|
ulong start;
|
|
int flag;
|
|
|
|
/* Check if Flash is (sufficiently) erased */
|
|
if ((*addr & data) != data) {
|
|
return (2);
|
|
}
|
|
/* Disable interrupts which might cause a timeout here */
|
|
flag = disable_interrupts();
|
|
|
|
*addr = SCS_PROGRAM_CMD;
|
|
*addr = data;
|
|
|
|
/* re-enable interrupts if necessary */
|
|
if (flag)
|
|
enable_interrupts();
|
|
|
|
start = get_timer (0);
|
|
|
|
while (((status = *addr) & SCS_SR7) != SCS_SR7) {
|
|
if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
|
|
*addr = SCS_READ_CMD;
|
|
return (1);
|
|
}
|
|
}
|
|
*addr = SCS_READ_CMD;
|
|
return (0);
|
|
}
|
|
|
|
/* vim: set ts=4 sw=4 tw=78: */
|