freebsd-dev/sys/isa/isahint.c
John Baldwin 0d484d249f Allow device hints to wire the unit numbers of devices.
- An "at" hint now reserves a device name.
- A new BUS_HINT_DEVICE_UNIT method is added to the bus interface.  When
  determining the unit number of a device, this method is invoked to
  let the bus driver specify the unit of a device given a specific
  devclass.  This is the only way a device can be given a name reserved
  via an "at" hint.
- Implement BUS_HINT_DEVICE_UNIT() for the acpi(4) and isa(4) bus drivers.
  Both of these busses implement this by comparing the resources for a
  given hint device with the resources enumerated by ACPI/PnPBIOS and
  wire a unit if the hint resources are a subset of the "real" resources.
- Use bus_hinted_children() for adding hinted devices on isa(4) busses
  now instead of doing it by hand.
- Remove the unit kludging from sio(4) as it is no longer necessary.

Prodding from:	peter, imp
OK'd by:	marcel
MFC after:	1 month
2008-11-18 21:01:54 +00:00

162 lines
4.6 KiB
C

/*-
* Copyright (c) 1999 Doug Rabson
* 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 THE AUTHOR 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 AUTHOR 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/bus.h>
#include <sys/module.h>
#include <isa/isavar.h>
#include <isa/isa_common.h>
#include <machine/resource.h>
void
isa_hinted_child(device_t parent, const char *name, int unit)
{
device_t child;
int sensitive, start, count;
int order;
/* device-specific flag overrides any wildcard */
sensitive = 0;
if (resource_int_value(name, unit, "sensitive", &sensitive) != 0)
resource_int_value(name, -1, "sensitive", &sensitive);
if (sensitive)
order = ISA_ORDER_SENSITIVE;
else
order = ISA_ORDER_SPECULATIVE;
child = BUS_ADD_CHILD(parent, order, name, unit);
if (child == 0)
return;
start = 0;
count = 0;
resource_int_value(name, unit, "port", &start);
resource_int_value(name, unit, "portsize", &count);
if (start > 0 || count > 0)
bus_set_resource(child, SYS_RES_IOPORT, 0, start, count);
start = 0;
count = 0;
resource_int_value(name, unit, "maddr", &start);
resource_int_value(name, unit, "msize", &count);
if (start > 0 || count > 0)
bus_set_resource(child, SYS_RES_MEMORY, 0, start, count);
if (resource_int_value(name, unit, "irq", &start) == 0 && start > 0)
bus_set_resource(child, SYS_RES_IRQ, 0, start, 1);
if (resource_int_value(name, unit, "drq", &start) == 0 && start >= 0)
bus_set_resource(child, SYS_RES_DRQ, 0, start, 1);
if (resource_disabled(name, unit))
device_disable(child);
isa_set_configattr(child, (isa_get_configattr(child)|ISACFGATTR_HINTS));
}
static int
isa_match_resource_hint(device_t dev, int type, long value)
{
struct isa_device* idev = DEVTOISA(dev);
struct resource_list *rl = &idev->id_resources;
struct resource_list_entry *rle;
STAILQ_FOREACH(rle, rl, link) {
if (rle->type != type)
continue;
if (rle->start <= value && rle->end >= value)
return (1);
}
return (0);
}
void
isa_hint_device_unit(device_t bus, device_t child, const char *name, int *unitp)
{
const char *s;
long value;
int line, matches, unit;
line = 0;
for (;;) {
if (resource_find_dev(&line, name, &unit, "at", NULL) != 0)
break;
/* Must have an "at" for isa. */
resource_string_value(name, unit, "at", &s);
if (!(strcmp(s, device_get_nameunit(bus)) == 0 ||
strcmp(s, device_get_name(bus)) == 0))
continue;
/*
* Check for matching resources. We must have at least one,
* and all resources specified have to match.
*
* XXX: We may want to revisit this to be more lenient and wire
* as long as it gets one match.
*/
matches = 0;
if (resource_long_value(name, unit, "port", &value) == 0) {
if (isa_match_resource_hint(child, SYS_RES_IOPORT,
value))
matches++;
else
continue;
}
if (resource_long_value(name, unit, "maddr", &value) == 0) {
if (isa_match_resource_hint(child, SYS_RES_MEMORY,
value))
matches++;
else
continue;
}
if (resource_long_value(name, unit, "irq", &value) == 0) {
if (isa_match_resource_hint(child, SYS_RES_IRQ, value))
matches++;
else
continue;
}
if (resource_long_value(name, unit, "drq", &value) == 0) {
if (isa_match_resource_hint(child, SYS_RES_DRQ, value))
matches++;
else
continue;
}
if (matches > 0) {
/* We have a winner! */
*unitp = unit;
break;
}
}
}