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

2 files changed, 0 insertions, 60 deletions

diff --git a/sys/dev/sio/sio_pci.c b/sys/dev/sio/sio_pci.c
index 459baa1..dc9b004 100644
--- a/sys/dev/sio/sio_pci.c
+++ b/sys/dev/sio/sio_pci.c
@@ -43,7 +43,6 @@ __FBSDID("$FreeBSD$");
 #include <dev/pci/pcivar.h>
 
 static	int	sio_pci_attach(device_t dev);
-static	void	sio_pci_kludge_unit(device_t dev);
 static	int	sio_pci_probe(device_t dev);
 
 static device_method_t sio_pci_methods[] = {
@@ -101,39 +100,9 @@ sio_pci_attach(dev)
 		id++;
 	if (id->desc == NULL)
 		return (ENXIO);
-	sio_pci_kludge_unit(dev);
 	return (sioattach(dev, id->rid, 0UL));
 }
 
-/*
- * Don't cut and paste this to other drivers.  It is a horrible kludge
- * which will fail to work and also be unnecessary in future versions.
- */
-static void
-sio_pci_kludge_unit(dev)
-	device_t dev;
-{
-	devclass_t	dc;
-	int		err;
-	int		start;
-	int		unit;
-
-	unit = 0;
-	start = 0;
-	while (resource_int_value("sio", unit, "port", &start) == 0 && 
-	    start > 0)
-		unit++;
-	if (device_get_unit(dev) < unit) {
-		dc = device_get_devclass(dev);
-		while (devclass_get_device(dc, unit))
-			unit++;
-		device_printf(dev, "moving to sio%d\n", unit);
-		err = device_set_unit(dev, unit);	/* EVIL DO NOT COPY */
-		if (err)
-			device_printf(dev, "error moving device %d\n", err);
-	}
-}
-
 static int
 sio_pci_probe(dev)
 	device_t	dev;
diff --git a/sys/dev/sio/sio_puc.c b/sys/dev/sio/sio_puc.c
index 37691f7..0ae0e7d 100644
--- a/sys/dev/sio/sio_puc.c
+++ b/sys/dev/sio/sio_puc.c
@@ -62,34 +62,6 @@ static driver_t sio_puc_driver = {
 	0,
 };
 
-/*
- * Don't cut and paste this to other drivers.  It is a horrible kludge
- * which will fail to work and also be unnecessary in future versions.
- */
-static void
-sio_puc_kludge_unit(device_t dev)
-{
-	devclass_t	dc;
-	int		err;
-	int		start;
-	int		unit;
-
-	unit = 0;
-	start = 0;
-	while (resource_int_value("sio", unit, "port", &start) == 0 && 
-	    start > 0)
-		unit++;
-	if (device_get_unit(dev) < unit) {
-		dc = device_get_devclass(dev);
-		while (devclass_get_device(dc, unit))
-			unit++;
-		device_printf(dev, "moving to sio%d\n", unit);
-		err = device_set_unit(dev, unit);	/* EVIL DO NOT COPY */
-		if (err)
-			device_printf(dev, "error moving device %d\n", err);
-	}
-}
-
 static int
 sio_puc_attach(device_t dev)
 {
@@ -98,7 +70,6 @@ sio_puc_attach(device_t dev)
 	if (BUS_READ_IVAR(device_get_parent(dev), dev, PUC_IVAR_CLOCK,
 	    &rclk) != 0)
 		rclk = DEFAULT_RCLK;
-	sio_puc_kludge_unit(dev);
 	return (sioattach(dev, 0, rclk));
 }