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/* $NetBSD: sram.c,v 1.10 2003/07/15 01:44:52 lukem Exp $ */
/*
* Copyright (c) 1994 Kazuhisa Shimizu.
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Kazuhisa Shimizu.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: sram.c,v 1.10 2003/07/15 01:44:52 lukem Exp $");
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/ioctl.h>
#include <sys/file.h>
#include <sys/malloc.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <machine/sram.h>
#include <x68k/dev/sramvar.h>
#include <x68k/x68k/iodevice.h>
struct sram_softc sram_softc;
#ifdef DEBUG
#define SRAM_DEBUG_OPEN 0x01
#define SRAM_DEBUG_CLOSE 0x02
#define SRAM_DEBUG_IOCTL 0x04
#define SRAM_DEBUG_DONTDOIT 0x08
int sramdebug = SRAM_DEBUG_IOCTL;
#endif
void sramattach __P((int));
dev_type_open(sramopen);
dev_type_close(sramclose);
dev_type_ioctl(sramioctl);
const struct cdevsw sram_cdevsw = {
sramopen, sramclose, noread, nowrite, sramioctl,
nostop, notty, nopoll, nommap, nokqfilter,
};
/*
* functions for probeing.
*/
/* ARGSUSED */
void
sramattach(num)
int num;
{
sram_softc.flags = 0;
printf("sram0: 16k bytes accessible\n");
}
/*
* functions made available by conf.c
*/
/*ARGSUSED*/
int
sramopen(dev, flags, mode, p)
dev_t dev;
int flags, mode;
struct proc *p;
{
struct sram_softc *su = &sram_softc;
#ifdef DEBUG
if (sramdebug & SRAM_DEBUG_OPEN)
printf ("Sram open\n");
#endif
if (minor(dev) >= 1)
return EXDEV;
if (su->flags & SRF_OPEN) {
return (EBUSY);
}
su->flags |= SRF_OPEN;
if (flags & FREAD)
su->flags |= SRF_READ;
if (flags & FWRITE)
su->flags |= SRF_WRITE;
return (0);
}
/*ARGSUSED*/
int
sramclose(dev, flags, mode, p)
dev_t dev;
int flags, mode;
struct proc *p;
{
struct sram_softc *su = &sram_softc;
#ifdef DEBUG
if (sramdebug & SRAM_DEBUG_CLOSE)
printf ("Sram close\n");
#endif
if (su->flags & SRF_OPEN) {
su->flags = 0;
}
su->flags &= ~(SRF_READ|SRF_WRITE);
return (0);
}
/*ARGSUSED*/
int
sramioctl (dev, cmd, data, flag, p)
dev_t dev;
u_long cmd;
caddr_t data;
int flag;
struct proc *p;
{
int error = 0;
struct sram_io *sram_io;
register char *sramtop = IODEVbase->io_sram;
struct sram_softc *su = &sram_softc;
#ifdef DEBUG
if (sramdebug & SRAM_DEBUG_IOCTL)
printf("Sram ioctl cmd=%lx\n", cmd);
#endif
sram_io = (struct sram_io *)data;
switch (cmd) {
case SIOGSRAM:
if ((su->flags & SRF_READ) == 0)
return(EPERM);
#ifdef DEBUG
if (sramdebug & SRAM_DEBUG_IOCTL) {
printf("Sram ioctl SIOGSRAM address=%p\n", data);
printf("Sram ioctl SIOGSRAM offset=%x\n", sram_io->offset);
}
#endif
if (sram_io == NULL ||
sram_io->offset + SRAM_IO_SIZE > SRAM_SIZE)
return(EFAULT);
memcpy(&(sram_io->sram), sramtop + sram_io->offset,
SRAM_IO_SIZE);
break;
case SIOPSRAM:
if ((su->flags & SRF_WRITE) == 0)
return(EPERM);
#ifdef DEBUG
if (sramdebug & SRAM_DEBUG_IOCTL) {
printf("Sram ioctl SIOPSRAM address=%p\n", data);
printf("Sram ioctl SIOPSRAM offset=%x\n", sram_io->offset);
}
#endif
if (sram_io == NULL ||
sram_io->offset + SRAM_IO_SIZE > SRAM_SIZE)
return(EFAULT);
#ifdef DEBUG
if (sramdebug & SRAM_DEBUG_DONTDOIT) {
printf ("Sram ioctl SIOPSRAM: skipping actual write\n");
break;
}
#endif
sysport.sramwp = 0x31;
memcpy(sramtop + sram_io->offset, &(sram_io->sram),
SRAM_IO_SIZE);
sysport.sramwp = 0x00;
break;
default:
error = EINVAL;
break;
}
return (error);
}
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