nes-proj/cpu/msp430/rom.c

158 lines
4.0 KiB
C

/*
* 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.
*
* @(#)$Id: rom.c,v 1.2 2006/12/01 15:06:42 bg- Exp $
*/
#include "contiki.h"
#include "dev/rom.h"
struct ictx {
int s;
unsigned short ie1, ie2, wdtctl;
};
static void
mask_intr(struct ictx *c)
{
/* Disable all interrupts. */
c->s = splhigh();
#define WDTRPW 0x6900 /* Watchdog key returned by read */
/* Disable all NMI-Interrupt sources */
c->wdtctl = WDTCTL;
c->wdtctl ^= (WDTRPW ^ WDTPW);
WDTCTL = WDTPW | WDTHOLD;
c->ie1 = IE1;
IE1 = 0x00;
c->ie2 = IE2;
IE2 = 0x00;
/* MSP430F1611 257 < f < 476 kHz, 2.4576MHz/(5+1) = 409.6 kHz. */
FCTL2 = FWKEY | FSSEL_SMCLK | (FN2 | FN1);
FCTL3 = FWKEY; /* Unlock flash. */
}
static void
rest_intr(struct ictx *c)
{
FCTL1 = FWKEY; /* Disable erase or write. */
FCTL3 = FWKEY | LOCK; /* Lock flash. */
/* Restore interrupts. */
IE2 = c->ie2;
IE1 = c->ie1;
WDTCTL = c->wdtctl;
splx(c->s);
}
/*
* This helper routine must reside in RAM!
*/
static void
blkwrt(void *to, const void *from, const void *from_end)
// __attribute__ ((section(".data")))
;
int
rom_erase(long nbytes, off_t offset)
{
int nb = nbytes;
char *to = (char *)(uintptr_t)offset;
struct ictx c;
if(nbytes % ROM_ERASE_UNIT_SIZE != 0) {
return -1;
}
if(offset % ROM_ERASE_UNIT_SIZE != 0) {
return -1;
}
while (nbytes > 0) {
mask_intr(&c);
FCTL1 = FWKEY | ERASE; /* Segment erase. */
*to = 0; /* Erase segment containing to. */
nbytes -= ROM_ERASE_UNIT_SIZE;
to += ROM_ERASE_UNIT_SIZE;
rest_intr(&c);
}
return nb;
}
int
rom_pwrite(const void *buf, int nbytes, off_t offset)
{
const char *from = buf;
int nb = nbytes;
char *to = (char *)(uintptr_t)offset;
struct ictx c;
mask_intr(&c);
while(nbytes > 0) {
int n = (nbytes > 64) ? 64 : nbytes;
FCTL1 = FWKEY | BLKWRT | WRT; /* Enable block write. */
blkwrt(to, from, from + n);
while(FCTL3 & BUSY);
to += 64;
from += 64;
nbytes -= n;
}
rest_intr(&c);
return nb;
}
/*
* This helper routine must reside in RAM!
*/
asm(".data");
asm(".p2align 1,0");
asm(".type blkwrt,@function");
asm(".section .data");
static void
blkwrt(void *_to, const void *_from, const void *_from_end)
{
unsigned short *to = _to;
const unsigned short *from = _from;
const unsigned short *from_end = _from_end;
do {
*to++ = *from++;
while(!(FCTL3 & WAIT));
} while(from < from_end);
FCTL1 = FWKEY; /* Disable block write. */
/* Now ROM is available again! */
}