f4a3eb0297
This patchset adds support to bhnd_chipc for sharing SYS_RES_MEMORY resources with its children, allowing us to hang devices off of bhnd_chipc that rely on access to a subset of the device register space that bhnd_chipc itself must also allocate. We could avoid most of this heavy lifting if RF_SHAREABLE+SYS_RES_MEMORY wasn't limited to use with allocations at the same size/offset. As a work-around, I implemented something similar to vga_pci.c, which implements similar reference counting of of PCI BAR resources for its children. With these changes, chipc will use reference counting of SYS_RES_MEMORY allocation/activation requests, to decide when to allocate/activate/ deactivate/release resources from the parent bhnd(4) bus. The requesting child device is allocated a new resource from chipc's rman, pointing to (possibly a subregion of) the refcounted bhnd resources allocated by chipc. Other resource types are just passed directly to the parent bhnd bus; RF_SHAREABLE works just fine with IRQs. I also lifted the SPROM device code out into a common driver, since this now allows me to hang simple subclasses off of a common driver off of both bhndb_pci and bhnd_chipc. Tested: * (landonf) Tested against BCM4331 and BCM4312, confirmed that SPROM still attaches and can be queried. Submitted by: Landon Fuller <landonf@landonf.org> Reviewed by: mizkha@gmail.com Differential Revision: https://reviews.freebsd.org/D6471
95 lines
3.1 KiB
C
95 lines
3.1 KiB
C
/*-
|
|
* Copyright (c) 2015-2016 Landon Fuller <landon@landonf.org>
|
|
* 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,
|
|
* without modification.
|
|
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
|
|
* similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
|
|
* redistribution must be conditioned upon including a substantially
|
|
* similar Disclaimer requirement for further binary redistribution.
|
|
*
|
|
* NO WARRANTY
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
|
|
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
|
|
* THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR 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 DAMAGES.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
/*
|
|
* BHNDB PCI SPROM driver.
|
|
*
|
|
* Provides support for early PCI bridge cores that vend SPROM CSRs
|
|
* via PCI configuration space.
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/bus.h>
|
|
#include <sys/limits.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/module.h>
|
|
#include <sys/systm.h>
|
|
|
|
#include <dev/pci/pcireg.h>
|
|
#include <dev/pci/pcivar.h>
|
|
|
|
#include <dev/bhnd/bhnd.h>
|
|
#include <dev/bhnd/cores/pci/bhnd_pci_hostbvar.h>
|
|
#include <dev/bhnd/nvram/bhnd_spromvar.h>
|
|
|
|
#include "bhnd_nvram_if.h"
|
|
|
|
#include "bhndb_pcireg.h"
|
|
#include "bhndb_pcivar.h"
|
|
|
|
static int
|
|
bhndb_pci_sprom_probe(device_t dev)
|
|
{
|
|
device_t bridge, bus;
|
|
int error;
|
|
|
|
/* Our parent must be a PCI-BHND bridge with an attached bhnd bus */
|
|
bridge = device_get_parent(dev);
|
|
if (device_get_driver(bridge) != &bhndb_pci_driver)
|
|
return (ENXIO);
|
|
|
|
bus = device_find_child(bridge, devclass_get_name(bhnd_devclass), 0);
|
|
if (bus == NULL)
|
|
return (ENXIO);
|
|
|
|
/* Defer to default driver implementation */
|
|
if ((error = bhnd_sprom_probe(dev)) > 0)
|
|
return (error);
|
|
|
|
return (BUS_PROBE_NOWILDCARD);
|
|
}
|
|
|
|
|
|
static device_method_t bhndb_pci_sprom_methods[] = {
|
|
/* Device interface */
|
|
DEVMETHOD(device_probe, bhndb_pci_sprom_probe),
|
|
DEVMETHOD_END
|
|
};
|
|
|
|
DEFINE_CLASS_1(bhnd_nvram, bhndb_pci_sprom_driver, bhndb_pci_sprom_methods, sizeof(struct bhnd_sprom_softc), bhnd_sprom_driver);
|
|
|
|
DRIVER_MODULE(bhndb_pci_sprom, bhndb, bhndb_pci_sprom_driver, bhnd_nvram_devclass, NULL, NULL);
|
|
MODULE_DEPEND(bhndb_pci_sprom, bhnd, 1, 1, 1);
|
|
MODULE_DEPEND(bhndb_pci_sprom, bhnd_sprom, 1, 1, 1);
|
|
MODULE_VERSION(bhndb_pci_sprom, 1);
|