105 lines
3.6 KiB
C
105 lines
3.6 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Authors: Joe Kloss; Ravi Pokala (rpokala@freebsd.org)
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*
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* Copyright (c) 2017-2018 Panasas
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _DEV__IMCSMB__IMCSMB_VAR_H_
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#define _DEV__IMCSMB__IMCSMB_VAR_H_
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/endian.h>
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#include <sys/errno.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/syslog.h>
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#include <sys/bus.h>
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#include <machine/bus.h>
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#include <machine/atomic.h>
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#include <dev/pci/pcivar.h>
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#include <dev/pci/pcireg.h>
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#include <dev/smbus/smbconf.h>
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#include "smbus_if.h"
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/* A detailed description of this device is present in imcsmb_pci.c */
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/**
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* The softc for a particular instance of the PCI device associated with a pair
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* of iMC-SMB controllers.
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*
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* Ordinarily, locking would be done with a mutex. However, we might have an
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* NVDIMM connected to this SMBus, and we might need to issue the SAVE command
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* to the NVDIMM from a panic context. Mutex operations are not allowed while
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* the scheduler is stopped, so just use a simple semaphore.
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*
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* If, as described in the manpage, additional steps are needed to stop/restart
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* firmware operations before/after using the controller, then additional fields
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* can be added to this softc.
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*/
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struct imcsmb_pci_softc {
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device_t dev;
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volatile int semaphore;
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};
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void imcsmb_pci_release_bus(device_t dev);
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int imcsmb_pci_request_bus(device_t dev);
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/**
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* PCI config registers for each individual SMBus controller within the iMC.
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* Each iMC-SMB has a separate set of registers. There is an array of these
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* structures for the PCI device, and one of them is passed to driver for the
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* actual iMC-SMB as the IVAR.
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*/
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struct imcsmb_reg_set {
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uint16_t smb_stat;
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uint16_t smb_cmd;
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uint16_t smb_cntl;
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};
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/**
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* The softc for the device associated with a particular iMC-SMB controller.
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* There are two such controllers for each of the PCI devices. The PCI driver
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* tells the iMC-SMB driver which set of registers to use via the IVAR. This
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* technique was suggested by John Baldwin (jhb@).
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*/
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struct imcsmb_softc {
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device_t dev;
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device_t imcsmb_pci; /* The SMBus controller's parent iMC */
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device_t smbus; /* The child smbusX interface */
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struct imcsmb_reg_set *regs; /* The registers this controller uses */
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};
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#endif /* _DEV__IMCSMB__IMCSMB_VAR_H_ */
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/* vi: set ts=8 sw=4 sts=8 noet: */
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