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freebsd/sys/dev/bhnd/bhnd_erom.c
Landon J. Fuller 111d7cb2e3 Migrate bhndb(4) to the new bhnd_erom API.
Adds support for probing and initializing bhndb(4) bridge state using
the bhnd_erom API, ensuring that full bridge configuration is available
*prior* to actually attaching and enumerating the bhnd(4) child device,
allowing us to safely allocate bus-level agent/device resources during
bhnd(4) bus enumeration.

- Add a bhnd_erom_probe() method usable by bhndb(4). This is an analogue
  to the existing bhnd_erom_probe_static() method, and allows the bhndb
  bridge to discover the best available erom parser class prior to newbus
  probing of its children.
- Add support for supplying identification hints when probing erom
  devices. This is required on early EXTIF-only chipsets, where chip
  identification registers are not available.
- Migrate bhndb over to the new bhnd_erom API, using bhnd_core_info
  records rather than bridged bhnd(4) device_t references to determine
  the bridged chipsets' capability/bridge configuration.
- The bhndb parent (e.g. if_bwn) is now required to supply a hardware
  priority table to the bridge. The default table is currently sufficient
  for our supported devices.
- Drop the two-pass attach approach we used for compatibility with bhndb(4) in
  the bhnd(4) bus drivers, and instead perform bus enumeration immediately,
  and allocate bridged per-child bus-level resources during that enumeration.

Approved by:	adrian (mentor)
Differential Revision:	https://reviews.freebsd.org/D7768
2016-09-04 00:58:19 +00:00

142 lines
4.5 KiB
C

/*-
* Copyright (c) 2016 Landon Fuller <landonf@FreeBSD.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("$FreeBSD$");
#include <sys/param.h>
#include <sys/kobj.h>
#include <dev/bhnd/bhndvar.h>
#include <dev/bhnd/bhnd_erom.h>
/**
* Allocate and return a new device enumeration table parser.
*
* @param cls The parser class for which an instance will be
* allocated.
* @param parent The parent device from which EROM resources should
* be allocated.
* @param rid The resource ID to be used when allocating EROM
* resources.
* @param cid The device's chip identifier.
*
* @retval non-NULL success
* @retval NULL if an error occured allocating or initializing the
* EROM parser.
*/
bhnd_erom_t *
bhnd_erom_alloc(bhnd_erom_class_t *cls, const struct bhnd_chipid *cid,
device_t parent, int rid)
{
bhnd_erom_t *erom;
int error;
erom = (bhnd_erom_t *)kobj_create((kobj_class_t)cls, M_BHND,
M_WAITOK|M_ZERO);
if ((error = BHND_EROM_INIT(erom, cid, parent, rid))) {
printf("error initializing %s parser at %#jx with "
"rid %d: %d\n", cls->name, (uintmax_t)cid->enum_addr, rid,
error);
kobj_delete((kobj_t)erom, M_BHND);
return (NULL);
}
return (erom);
}
/**
* Perform static initialization of aa device enumeration table parser using
* the provided bus space tag and handle.
*
* This may be used to initialize a caller-allocated erom instance state
* during early boot, prior to malloc availability.
*
* @param cls The parser class for which an instance will be
* allocated.
* @param erom The erom parser instance to initialize.
* @param esize The total available number of bytes allocated for
* @p erom. If this is less than is required by @p cls,
* ENOMEM will be returned.
* @param cid The device's chip identifier.
* @param bst Bus space tag.
* @param bsh Bus space handle mapping the device enumeration
* space.
*
* @retval 0 success
* @retval ENOMEM if @p esize is smaller than required by @p cls.
* @retval non-zero if an error occurs initializing the EROM parser,
* a regular unix error code will be returned.
*/
int
bhnd_erom_init_static(bhnd_erom_class_t *cls, bhnd_erom_t *erom, size_t esize,
const struct bhnd_chipid *cid, bus_space_tag_t bst, bus_space_handle_t bsh)
{
kobj_class_t kcls;
kcls = (kobj_class_t)cls;
/* Verify allocation size */
if (kcls->size > esize)
return (ENOMEM);
/* Perform instance initialization */
kobj_init_static((kobj_t)erom, kcls);
return (BHND_EROM_INIT_STATIC(erom, cid, bst, bsh));
}
/**
* Release any resources held by a @p erom parser previously
* initialized via bhnd_erom_init_static().
*
* @param erom An erom parser instance previously initialized via
* bhnd_erom_init_static().
*/
void
bhnd_erom_fini_static(bhnd_erom_t *erom)
{
return (BHND_EROM_FINI(erom));
}
/**
* Release all resources held by a @p erom parser previously
* allocated via bhnd_erom_alloc().
*
* @param erom An erom parser instance previously allocated via
* bhnd_erom_alloc().
*/
void
bhnd_erom_free(bhnd_erom_t *erom)
{
BHND_EROM_FINI(erom);
kobj_delete((kobj_t)erom, M_BHND);
}