Date: Thu, 1 Jun 2000 05:50:02 -0700 (PDT) From: Alexander Langer <alex@big.endian.de> To: freebsd-doc@freebsd.org Subject: Re: docs/18918: add bus_alloc_resource.9 and bus_release_resource.9 Message-ID: <200006011250.FAA07185@freefall.freebsd.org>
next in thread | raw e-mail | index | archive | help
The following reply was made to PR docs/18918; it has been noted by GNATS. From: Alexander Langer <alex@big.endian.de> To: FreeBSD-GNATS-submit@freebsd.org Cc: freebsd-doc@FreeBSD.ORG Subject: Re: docs/18918: add bus_alloc_resource.9 and bus_release_resource.9 Date: Thu, 1 Jun 2000 14:47:03 +0200 Too keep the new versions in the GNATS-db, here they are: .\" -*- nroff -*- .\" .\" Copyright (c) 2000 Alexander Langer .\" .\" All rights reserved. .\" .\" This program is free software. .\" .\" 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 DEVELOPERS ``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 DEVELOPERS 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. .\" .\" $FreeBSD$ .\" .Dd May 18, 2000 .Dt BUS_ALLOC_RESOURCE 9 .Os FreeBSD .Sh NAME .Nm bus_alloc_resource .Nd alloc resources on a bus .Sh SYNOPSIS .Fd #include <sys/param.h> .Fd #include <sys/bus.h> .Fd #include <sys/rman.h> .Fd #include <sys/resource.h> .Ft struct resource * .Fn bus_alloc_resource "device_t dev" "int type" "int *rid" "u_long start" "u_long end" "u_long count" "u_int flags" .Sh DESCRIPTION .Pp This is an easy interface to the resource-management functions. It hides the indirection through the parent's method table. This function generally should be called in attach, but (except in some race cases) never earlier. .Pp Its arguments are as follows: .Bl -item .It .Fa dev is the device that requests ownership of the resource. Before allocation, the device is owned by the parent bus. .It .Fa type is the type of resource you want to allocate. It is one of: .Bl -tag -width SYS_RES_MEMORY .It Dv SYS_RES_IRQ for IRQs .It Dv SYS_RES_DRQ for ISA DMA lines .It Dv SYS_RES_IOPORT for I/O ports .It Dv SYS_RES_MEMORY for I/O memory .El .It .Fa rid points to a bus specific handle that identifies the resource being allocated. For ISA this is an index into an array of resources that have been setup for this device by either the PnP mechanism, or via the hints mechanism. For PCCARD, similar things are used as of writing, but that may change in the future with newcard. For PCI it just happens to be the offset into pci config space which has a word that describes the resource. The bus methods are free to change the RIDs that are passed to it - that's why it is a pointer. You must not depend on the value you gave it earlier. .It .Fa start and .Fa end are the start/end addresses of the resource. If you specify values of .Dv 0 for start and .Dv ~0 for end, the default values for the bus are calculated. .It .Fa count is the size of the resource, e.g. the size of an I/O port (often .Dv 1 on PCI and device-dependent on ISA and PCCARD). If you specified the default values for .Fa start and .Fa end , then the default value of the bus is used if .Fa count is smaller than the default value and .Fa count is used, if it is bigger as the default value. .It .Fa flags sets the flags for the resource. You can set one or more of these flags: .Bl -tag -width RF_SHAREABLE .It Dv RF_ALLOCATED resource has been reserved. Resource still needs to be activated with .Xr rman_activate_resource 9 . .It Dv RF_ACTIVE activate resource atomically. .It Dv RF_SHAREABLE resource permits contemporaneous sharing. Should always be set unless you know, that the resource cannot be shared. It is the bus-code's task to filter out the flag if the bus doesn't support sharing, which is, for example, the case for pccard/cardbus, which can or can not share devices, depending on the bus. .It Dv RF_TIMESHARE resource permits time-division sharing. .El .El .Sh RETURN VALUES A pointer to .Va struct res is returned on success, a null pointer otherwise. .Sh EXAMPLES This is some example code. The values of .Va portid and .Va irqid should be saved in the softc of the device after these calls. .Bd -literal struct resource *portres, irqres; int portid, irqid; portid = 0; irqid = 0; portres = bus_alloc_resource(dev, SYS_RES_IOPORT, &portid, 0ul, ~0ul, 32, RF_ACTIVE); irqres = bus_alloc_resource(dev, SYS_RES_IRQ, &irqid, 0ul, ~0ul, 1, RF_ACTIVE | RF_SHAREABLE); .Ed .Sh SEE ALSO .Xr driver 9 , .Xr device 9 , .Xr bus_release_resource 9 .Sh AUTHORS This man page was written by .An Alexander Langer Aq alex@big.endian.de with parts by .An Warner Losh Aq imp@FreeBSD.ORG . .\" -*- nroff -*- .\" .\" Copyright (c) 2000 Alexander Langer .\" .\" All rights reserved. .\" .\" This program is free software. .\" .\" 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 DEVELOPERS ``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 DEVELOPERS 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. .\" .\" $FreeBSD$ .\" .Dd May 18, 2000 .Dt BUS_RELEASE_RESOURCE 9 .Os FreeBSD .Sh NAME .Nm bus_release_resource .Nd release resources on a bus .Sh SYNOPSIS .Fd #include <sys/param.h> .Fd #include <sys/bus.h> .Fd #include <sys/rman.h> .Fd #include <sys/resource.h> .Ft int .Fn bus_release_resource "device_t dev" "int type" "int rid" "struct resource *r" .Sh DESCRIPTION Free a resource allocated by .Xr bus_alloc_resource 9 . The resource must not be in use on release, i.e. call an appropriate function before (e.g. .Xr bus_teardown_intr 9 for IRQs). .Bl -item .It .Fa dev is the device that owns the resource. .It .Fa type is the type of resource that is released. It must be of the same type you allocated it as before. See .Xr bus_alloc_resource 9 for valid types. .It .Fa rid is the resource ID of the resource. The .Fa rid value must be the same as the one returned by .Xr bus_alloc_resource 9 . .It .Fa r is the pointer to .Va struct res , i.e. the resource itself, returned by .Xr bus_alloc_resource 9 . .El .Sh RETURN VALUES .Er EINVAL is returned, if the device .Fa dev has no parent, .Dv 0 otherwise. The kernel will panic, if it can't release the resource. .Sh EXAMPLES .Bd -literal /* deactivate IRQ */ bus_teardown_intr(dev, foosoftc->irqres, foosoftc->irqid); /* release IRQ resource */ bus_release_resource(dev, SYS_RES_IRQ, foosoftc->irqid, foosoftc->irqres); /* release I/O port resource */ bus_release_resource(dev, SYS_RES_IOPORT, foosoftc->portid, foosoftc->portres); .Ed .Sh SEE ALSO .Xr driver 9 , .Xr device 9 , .Xr bus_alloc_resource 9 .Sh AUTHORS This man page was written by .An Alexander Langer Aq alex@big.endian.de . To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-doc" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200006011250.FAA07185>