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/*
* (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 <nios.h>
/*---------------------------------------------------------------------*/
#define BANKSZ (8 * 1024 * 1024)
#define SECTSZ (64 * 1024)
#define USERFLASH (2 * 1024 * 1024) /* bottom 2 MB for user */
flash_info_t flash_info[CFG_MAX_FLASH_BANKS];
#define FLASH_WORD_SIZE unsigned char
/*---------------------------------------------------------------------*/
unsigned long flash_init (void)
{
int i;
unsigned long addr;
flash_info_t *fli = &flash_info[0];
fli->size = BANKSZ;
fli->sector_count = CFG_MAX_FLASH_SECT;
fli->flash_id = FLASH_MAN_AMD;
addr = CFG_FLASH_BASE;
for (i = 0; i < fli->sector_count; ++i) {
fli->start[i] = addr;
addr += SECTSZ;
/* Protect all but 2 MByte user area */
if (addr < (CFG_FLASH_BASE + USERFLASH))
fli->protect[i] = 0;
else
fli->protect[i] = 1;
}
return (BANKSZ);
}
/*--------------------------------------------------------------------*/
void flash_print_info (flash_info_t * info)
{
int i, k;
unsigned long size;
int erased;
volatile unsigned char *flash;
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 char *) info->start[i];
for (k = 0; k < size; k++) {
if (*flash++ != 0xff) {
erased = 0;
break;
}
}
/* Print the info */
if ((i % 5) == 0)
printf ("\n ");
printf (" %08lX%s%s", info->start[i], erased ? " E" : " ",
info->protect[i] ? "RO " : " ");
}
printf ("\n");
}
/*-------------------------------------------------------------------*/
int flash_erase (flash_info_t * info, int s_first, int s_last)
{
volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *) (info->start[0]);
volatile FLASH_WORD_SIZE *addr2;
int prot, sect;
int any = 0;
unsigned oldpri;
ulong start;
/* Some sanity checking */
if ((s_first < 0) || (s_first > s_last)) {
printf ("- no sectors to erase\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");
}
/* NOTE: disabling interrupts on Nios can be very bad since it
* also disables the LO_LIMIT exception. It's better here to
* set the interrupt priority to 3 & restore it when we're done.
*/
oldpri = ipri (3);
/* It's ok to erase multiple sectors provided we don't delay more
* than 50 usec between cmds ... at which point the erase time-out
* occurs. So don't go and put printf() calls in the loop ... it
* won't be very helpful ;-)
*/
for (sect = s_first; sect <= s_last; sect++) {
if (info->protect[sect] == 0) { /* not protected */
addr2 = (FLASH_WORD_SIZE *) (info->start[sect]);
*addr = 0xaa;
*addr = 0x55;
*addr = 0x80;
*addr = 0xaa;
*addr = 0x55;
*addr2 = 0x30;
any = 1;
}
}
/* Now just wait for 0xff & provide some user feedback while
* we wait.
*/
if (any) {
addr2 = (FLASH_WORD_SIZE *) (info->start[sect]);
start = get_timer (0);
while (*addr2 != 0xff) {
udelay (1000 * 1000);
putc ('.');
if (get_timer (start) > CFG_FLASH_ERASE_TOUT) {
printf ("timeout\n");
return 1;
}
}
printf ("\n");
}
/* Restore interrupt priority */
ipri (oldpri);
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)
{
vu_char *cmd = (vu_char *) info->start[0];
vu_char *dst = (vu_char *) addr;
unsigned char b;
unsigned oldpri;
ulong start;
while (cnt) {
/* Check for sufficient erase */
b = *src;
if ((*dst & b) != b) {
printf ("%02x : %02x\n", *dst, b);
return (2);
}
/* Disable interrupts other than window underflow
* (interrupt priority 2)
*/
oldpri = ipri (3);
*cmd = 0xaa;
*cmd = 0x55;
*cmd = 0xa0;
*dst = b;
/* Verify write */
start = get_timer (0);
while (*dst != b) {
if (get_timer (start) > CFG_FLASH_WRITE_TOUT) {
ipri (oldpri);
return 1;
}
}
dst++;
src++;
cnt--;
ipri (oldpri);
}
return (0);
}
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