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/*-
* Copyright (C) 2000 Benno Rice.
* 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.
*
* THIS SOFTWARE IS PROVIDED BY Benno Rice ``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 TOOLS GMBH 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("$FreeBSD$");
/*
* Disk I/O routines using Open Firmware
*/
#include <sys/param.h>
#include <sys/queue.h>
#include <netinet/in.h>
#include <machine/stdarg.h>
#include <stand.h>
#include "bootstrap.h"
#include "libofw.h"
static int ofwd_init(void);
static int ofwd_strategy(void *devdata, int flag, daddr_t dblk,
size_t size, char *buf, size_t *rsize);
static int ofwd_open(struct open_file *f, ...);
static int ofwd_close(struct open_file *f);
static int ofwd_ioctl(struct open_file *f, u_long cmd, void *data);
static void ofwd_print(int verbose);
struct devsw ofwdisk = {
"block",
DEVT_DISK,
ofwd_init,
ofwd_strategy,
ofwd_open,
ofwd_close,
ofwd_ioctl,
ofwd_print
};
struct opened_dev {
ihandle_t handle;
u_int count;
SLIST_ENTRY(opened_dev) link;
};
SLIST_HEAD(, opened_dev) opened_devs = SLIST_HEAD_INITIALIZER(opened_devs);
static int
ofwd_init(void)
{
return 0;
}
static int
ofwd_strategy(void *devdata, int flag, daddr_t dblk, size_t size, char *buf,
size_t *rsize)
{
struct ofw_devdesc *dp = (struct ofw_devdesc *)devdata;
daddr_t pos;
int n;
pos = dblk * 512;
do {
if (OF_seek(dp->d_handle, pos) < 0)
return EIO;
n = OF_read(dp->d_handle, buf, size);
if (n < 0 && n != -2)
return EIO;
} while (n == -2);
*rsize = size;
return 0;
}
static int
ofwd_open(struct open_file *f, ...)
{
char path[256];
struct ofw_devdesc *dp;
struct opened_dev *odp;
va_list vl;
va_start(vl, f);
dp = va_arg(vl, struct ofw_devdesc *);
va_end(vl);
/*
* We're not guaranteed to be able to open a device more than once
* simultaneously and there is no OFW standard method to determine
* whether a device is already opened. Opening a device more than
* once happens to work with most OFW block device drivers but
* triggers a trap with at least the driver for the on-board SCSI
* controller in Sun Ultra 1. Upper layers and MI code expect to
* be able to open a device more than once however. As a workaround
* keep track of the opened devices and reuse the instance handle
* when asked to open an already opened device.
*/
SLIST_FOREACH(odp, &opened_devs, link) {
if (OF_instance_to_path(odp->handle, path, sizeof(path)) == -1)
continue;
if (strcmp(path, dp->d_path) == 0) {
odp->count++;
dp->d_handle = odp->handle;
return 0;
}
}
odp = malloc(sizeof(struct opened_dev));
if (odp == NULL) {
printf("ofwd_open: malloc failed\n");
return ENOMEM;
}
if ((odp->handle = OF_open(dp->d_path)) == -1) {
printf("ofwd_open: Could not open %s\n", dp->d_path);
free(odp);
return ENOENT;
}
odp->count = 1;
SLIST_INSERT_HEAD(&opened_devs, odp, link);
dp->d_handle = odp->handle;
return 0;
}
static int
ofwd_close(struct open_file *f)
{
struct ofw_devdesc *dev = f->f_devdata;
struct opened_dev *odp;
SLIST_FOREACH(odp, &opened_devs, link) {
if (odp->handle == dev->d_handle) {
odp->count--;
if (odp->count == 0) {
SLIST_REMOVE(&opened_devs, odp, opened_dev,
link);
#if !defined(__powerpc__)
OF_close(odp->handle);
#endif
free(odp);
}
break;
}
}
return 0;
}
static int
ofwd_ioctl(struct open_file *f, u_long cmd, void *data)
{
return (EINVAL);
}
static void
ofwd_print(int verbose)
{
}
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