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/*-
* Copyright (c) 2004 Mark R V Murray
* 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
* in this position and unchanged.
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``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>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/ioccom.h>
#include <sys/module.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <machine/iodev.h>
#include <dev/io/iodev.h>
static int ioopen(struct cdev *dev, int flags, int fmt,
struct thread *td);
static int ioclose(struct cdev *dev, int flags, int fmt,
struct thread *td);
static int ioioctl(struct cdev *dev, u_long cmd, caddr_t data,
int fflag, struct thread *td);
static int iopio_read(struct iodev_pio_req *req);
static int iopio_write(struct iodev_pio_req *req);
static struct cdev *iodev;
static struct cdevsw io_cdevsw = {
.d_version = D_VERSION,
.d_open = ioopen,
.d_close = ioclose,
.d_ioctl = ioioctl,
.d_name = "io",
};
/* ARGSUSED */
static int
ioopen(struct cdev *dev __unused, int flags __unused, int fmt __unused,
struct thread *td)
{
int error;
error = priv_check(td, PRIV_IO);
if (error != 0)
return (error);
error = securelevel_gt(td->td_ucred, 0);
if (error != 0)
return (error);
error = iodev_open(td);
return (error);
}
/* ARGSUSED */
static int
ioclose(struct cdev *dev __unused, int flags __unused, int fmt __unused,
struct thread *td)
{
return (iodev_close(td));
}
/* ARGSUSED */
static int
ioioctl(struct cdev *dev __unused, u_long cmd, caddr_t data,
int fflag __unused, struct thread *td __unused)
{
struct iodev_pio_req *pio_req;
int error;
switch (cmd) {
case IODEV_PIO:
pio_req = (struct iodev_pio_req *)data;
switch (pio_req->access) {
case IODEV_PIO_READ:
error = iopio_read(pio_req);
break;
case IODEV_PIO_WRITE:
error = iopio_write(pio_req);
break;
default:
error = EINVAL;
break;
}
break;
default:
error = iodev_ioctl(cmd, data);
}
return (error);
}
static int
iopio_read(struct iodev_pio_req *req)
{
switch (req->width) {
case 1:
req->val = iodev_read_1(req->port);
break;
case 2:
if (req->port & 1) {
req->val = iodev_read_1(req->port);
req->val |= iodev_read_1(req->port + 1) << 8;
} else
req->val = iodev_read_2(req->port);
break;
case 4:
if (req->port & 1) {
req->val = iodev_read_1(req->port);
req->val |= iodev_read_2(req->port + 1) << 8;
req->val |= iodev_read_1(req->port + 3) << 24;
} else if (req->port & 2) {
req->val = iodev_read_2(req->port);
req->val |= iodev_read_2(req->port + 2) << 16;
} else
req->val = iodev_read_4(req->port);
break;
default:
return (EINVAL);
}
return (0);
}
static int
iopio_write(struct iodev_pio_req *req)
{
switch (req->width) {
case 1:
iodev_write_1(req->port, req->val);
break;
case 2:
if (req->port & 1) {
iodev_write_1(req->port, req->val);
iodev_write_1(req->port + 1, req->val >> 8);
} else
iodev_write_2(req->port, req->val);
break;
case 4:
if (req->port & 1) {
iodev_write_1(req->port, req->val);
iodev_write_2(req->port + 1, req->val >> 8);
iodev_write_1(req->port + 3, req->val >> 24);
} else if (req->port & 2) {
iodev_write_2(req->port, req->val);
iodev_write_2(req->port + 2, req->val >> 16);
} else
iodev_write_4(req->port, req->val);
break;
default:
return (EINVAL);
}
return (0);
}
/* ARGSUSED */
static int
io_modevent(module_t mod __unused, int type, void *data __unused)
{
switch(type) {
case MOD_LOAD:
if (bootverbose)
printf("io: <I/O>\n");
iodev = make_dev(&io_cdevsw, 0,
UID_ROOT, GID_WHEEL, 0600, "io");
break;
case MOD_UNLOAD:
destroy_dev(iodev);
break;
case MOD_SHUTDOWN:
break;
default:
return(EOPNOTSUPP);
break;
}
return (0);
}
DEV_MODULE(io, io_modevent, NULL);
MODULE_VERSION(io, 1);
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