162 lines
3.9 KiB
C
162 lines
3.9 KiB
C
/*
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* Copyright (c) 2006, Swedish Institute of Computer Science
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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/**
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* \file
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* Device driver for the MX25R8035F 1Mbyte external memory.
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* \author
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* Dongda Lee <dongdongbhbh@gmail.com>
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*
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* Data is written bit inverted (~-operator) to flash so that
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* unwritten data will read as zeros (UNIX style).
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*/
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#include "contiki.h"
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#include "ext-flash.h"
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#include "dev/xmem.h"
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#include "dev/watchdog.h"
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#include "cfs-coffee-arch.h"
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#include <stdio.h> /* For PRINTF() */
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#define EXT_ERASE_UNIT_SIZE 4096UL
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#define XMEM_BUFF_LENGHT 128
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#if 0
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#define PRINTF(...) printf(__VA_ARGS__)
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#else
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#define PRINTF(...) do {} while(0)
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#endif
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void
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xmem_init(void)
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{
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ext_flash_open(NULL);
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}
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int
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xmem_pread(void *_p, int size, unsigned long addr)
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{
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int rv;
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uint8_t x;
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int i;
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rv = ext_flash_open(NULL);
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if(!rv) {
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PRINTF("Could not open flash to save config\n");
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ext_flash_close(NULL);
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return -1;
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}
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rv = ext_flash_read(NULL, addr, size, _p);
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for(i = 0; i < size; i++) {
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x = ~*((uint8_t *)_p + i);
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*((uint8_t *)_p + i) = x;
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}
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ext_flash_close(NULL);
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if(rv) {
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return size;
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}
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PRINTF("Could not read flash memory!\n");
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return -1;
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}
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int
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xmem_pwrite(const void *_buf, int size, unsigned long addr)
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{
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int rv;
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int i, j;
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int remain;
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uint8_t tmp_buf[XMEM_BUFF_LENGHT];
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rv = ext_flash_open(NULL);
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if(!rv) {
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PRINTF("Could not open flash to save config!\n");
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ext_flash_close(NULL);
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return -1;
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}
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for(remain = size, j = 0; remain > 0; remain -= XMEM_BUFF_LENGHT, j += XMEM_BUFF_LENGHT) {
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int to_write = MIN(XMEM_BUFF_LENGHT, remain);
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for(i = 0; i < to_write; i++) {
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tmp_buf[i] = ~*((uint8_t *)_buf + j + i);
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}
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rv = ext_flash_write(NULL, addr + j, to_write, tmp_buf);
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if(!rv) {
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PRINTF("Could not write flash memory!\n");
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return size - remain;
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}
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}
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ext_flash_close(NULL);
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return size;
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}
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int
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xmem_erase(long size, unsigned long addr)
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{
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int rv;
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rv = ext_flash_open(NULL);
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if(!rv) {
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PRINTF("Could not open flash to save config\n");
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ext_flash_close(NULL);
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return -1;
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}
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if(size % EXT_ERASE_UNIT_SIZE != 0) {
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PRINTF("xmem_erase: bad size\n");
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return -1;
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}
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if(addr % EXT_ERASE_UNIT_SIZE != 0) {
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PRINTF("xmem_erase: bad offset\n");
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return -1;
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}
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rv = ext_flash_erase(NULL, addr, size);
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ext_flash_close(NULL);
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watchdog_periodic();
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if(rv) {
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return size;
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}
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PRINTF("Could not erase flash memory\n");
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return -1;
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}
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