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/**
* NXT bootstrap interface; NXT flash chip code.
*
* Copyright 2006 David Anderson <dave@natulte.net>
*
* 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 "flash.h"
#include "samba.h"
enum nxt_flash_commands
{
FLASH_CMD_LOCK = 0x2,
FLASH_CMD_UNLOCK = 0x4,
};
nxt_error_t
nxt_flash_wait_ready(nxt_t *nxt)
{
nxt_word_t flash_status;
do
{
NXT_ERR(nxt_read_word(nxt, 0xFFFFFF68, &flash_status));
/* Bit 0 is the FRDY field. Set to 1 if the flash controller is
* ready to run a new command.
*/
}
while (!(flash_status & 0x1));
return NXT_OK;
}
static nxt_error_t
nxt_flash_alter_lock(nxt_t *nxt, int region_num, enum nxt_flash_commands cmd)
{
nxt_word_t w = 0x5A000000 | ((64 * region_num) << 8);
w += cmd;
NXT_ERR(nxt_flash_wait_ready(nxt));
/* Flash mode register: FCMN 0x5, FWS 0x1
* Flash command register: KEY 0x5A, FCMD = clear-lock-bit (0x4)
* Flash mode register: FCMN 0x34, FWS 0x1
*/
NXT_ERR(nxt_write_word(nxt, 0xFFFFFF60, 0x00050100));
NXT_ERR(nxt_write_word(nxt, 0xFFFFFF64, w));
NXT_ERR(nxt_write_word(nxt, 0xFFFFFF60, 0x00340100));
return NXT_OK;
}
nxt_error_t
nxt_flash_lock_region(nxt_t *nxt, int region_num)
{
return nxt_flash_alter_lock(nxt, region_num, FLASH_CMD_LOCK);
}
nxt_error_t
nxt_flash_unlock_region(nxt_t *nxt, int region_num)
{
return nxt_flash_alter_lock(nxt, region_num, FLASH_CMD_UNLOCK);
}
nxt_error_t
nxt_flash_lock_all_regions(nxt_t *nxt)
{
int i;
for (i = 0; i < 16; i++)
NXT_ERR(nxt_flash_lock_region(nxt, i));
return NXT_OK;
}
nxt_error_t
nxt_flash_unlock_all_regions(nxt_t *nxt)
{
int i;
for (i = 0; i < 16; i++)
NXT_ERR(nxt_flash_unlock_region(nxt, i));
return NXT_OK;
}
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