9b7938dcf3
When iicbus is attached as child of Designware I2C controller it scans all ACPI nodes for "I2C Serial Bus Connection Resource Descriptor" described in section 19.6.57 of ACPI specs. If such a descriptor is found, I2C child is added to iicbus, it's I2C address, IRQ resource and ACPI handle are added to ivars. Existing ACPI bus-hosted child is deleted afterwards. The driver also installs so called "I2C address space handler" which is disabled by default as nontested. Set hw.iicbus.enable_acpi_space_handler loader tunable to 1 to enable it. Reviewed by: markj MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D22901
104 lines
3.6 KiB
C
104 lines
3.6 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 1998 Nicolas Souchu
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* All rights reserved.
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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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* $FreeBSD$
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*
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*/
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#ifndef __IICBUS_H
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#define __IICBUS_H
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#include <sys/_lock.h>
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#include <sys/_mutex.h>
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#define IICBUS_IVAR(d) (struct iicbus_ivar *) device_get_ivars(d)
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#define IICBUS_SOFTC(d) (struct iicbus_softc *) device_get_softc(d)
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struct iicbus_softc
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{
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device_t dev; /* Myself */
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device_t owner; /* iicbus owner device structure */
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device_t busydev; /* iicbus_release_bus calls unbusy on this */
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u_int owncount; /* iicbus ownership nesting count */
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u_char started; /* address of the 'started' slave
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* 0 if no start condition succeeded */
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u_char strict; /* deny operations that violate the
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* I2C protocol */
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struct mtx lock;
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u_int bus_freq; /* Configured bus Hz. */
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};
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struct iicbus_ivar
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{
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uint32_t addr;
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struct resource_list rl;
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};
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/* Value of 0x100 is reserved for ACPI_IVAR_HANDLE used by acpi_iicbus */
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enum {
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IICBUS_IVAR_ADDR /* Address or base address */
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};
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#define IICBUS_ACCESSOR(A, B, T) \
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__BUS_ACCESSOR(iicbus, A, IICBUS, B, T)
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IICBUS_ACCESSOR(addr, ADDR, uint32_t)
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#define IICBUS_LOCK(sc) mtx_lock(&(sc)->lock)
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#define IICBUS_UNLOCK(sc) mtx_unlock(&(sc)->lock)
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#define IICBUS_ASSERT_LOCKED(sc) mtx_assert(&(sc)->lock, MA_OWNED)
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#ifdef FDT
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#define IICBUS_FDT_PNP_INFO(t) FDTCOMPAT_PNP_INFO(t, iicbus)
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#else
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#define IICBUS_FDT_PNP_INFO(t)
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#endif
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int iicbus_generic_intr(device_t dev, int event, char *buf);
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void iicbus_init_frequency(device_t dev, u_int bus_freq);
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int iicbus_attach_common(device_t dev, u_int bus_freq);
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device_t iicbus_add_child_common(device_t dev, u_int order, const char *name,
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int unit, size_t ivars_size);
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int iicbus_detach(device_t dev);
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void iicbus_probe_nomatch(device_t bus, device_t child);
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int iicbus_read_ivar(device_t bus, device_t child, int which,
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uintptr_t *result);
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int iicbus_write_ivar(device_t bus, device_t child, int which,
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uintptr_t value);
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int iicbus_child_location_str(device_t bus, device_t child, char *buf,
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size_t buflen);
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int iicbus_child_pnpinfo_str(device_t bus, device_t child, char *buf,
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size_t buflen);
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extern driver_t iicbus_driver;
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extern devclass_t iicbus_devclass;
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extern driver_t ofw_iicbus_driver;
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extern devclass_t ofw_iicbus_devclass;
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extern driver_t acpi_iicbus_driver;
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#endif
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