nes-proj/arch/platform/srf06-cc26xx/common/xmem.c

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