210 lines
5.5 KiB
C
210 lines
5.5 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2004 Joerg Wunsch
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*
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* derived from sys/i386/isa/pcf.c which is:
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*
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* Copyright (c) 1998 Nicolas Souchu, Marc Bouget
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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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#include <sys/cdefs.h>
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/*
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* Hardware driver for a Philips PCF8584 I2C bus controller sitting
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* on a generic ISA bus.
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*/
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/lock.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <sys/resource.h>
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#include <sys/systm.h>
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#include <machine/bus.h>
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#include <machine/resource.h>
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#include <sys/rman.h>
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#include <isa/isareg.h>
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#include <isa/isavar.h>
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#include <dev/iicbus/iiconf.h>
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#include <dev/pcf/pcfvar.h>
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#include "iicbus_if.h"
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#define PCF_NAME "pcf"
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static void pcf_isa_identify(driver_t *, device_t);
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static int pcf_isa_probe(device_t);
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static int pcf_isa_attach(device_t);
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static int pcf_isa_detach(device_t);
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static device_method_t pcf_isa_methods[] = {
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/* device interface */
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DEVMETHOD(device_identify, pcf_isa_identify),
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DEVMETHOD(device_probe, pcf_isa_probe),
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DEVMETHOD(device_attach, pcf_isa_attach),
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DEVMETHOD(device_detach, pcf_isa_detach),
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/* iicbus interface */
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DEVMETHOD(iicbus_callback, iicbus_null_callback),
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DEVMETHOD(iicbus_repeated_start, pcf_repeated_start),
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DEVMETHOD(iicbus_start, pcf_start),
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DEVMETHOD(iicbus_stop, pcf_stop),
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DEVMETHOD(iicbus_write, pcf_write),
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DEVMETHOD(iicbus_read, pcf_read),
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DEVMETHOD(iicbus_reset, pcf_rst_card),
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{ 0, 0 }
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};
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static driver_t pcf_isa_driver = {
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PCF_NAME,
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pcf_isa_methods,
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sizeof(struct pcf_softc),
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};
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static void
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pcf_isa_identify(driver_t *driver, device_t parent)
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{
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BUS_ADD_CHILD(parent, ISA_ORDER_SPECULATIVE, PCF_NAME, 0);
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return;
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}
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static int
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pcf_isa_probe(device_t dev)
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{
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rman_res_t start, count;
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u_int rid = 0, port, error;
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/* skip PnP probes */
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if (isa_get_logicalid(dev))
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return (ENXIO);
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/* The port address must be explicitly specified */
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bus_get_resource(dev, SYS_RES_IOPORT, rid, &start, &count);
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if ((error = resource_int_value(PCF_NAME, 0, "port", &port)) != 0)
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return (error);
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/* Probe is only successful for the specified base io */
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if (port != (u_int)start)
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return (ENXIO);
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device_set_desc(dev, "PCF8584 I2C bus controller");
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return (0);
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}
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static int
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pcf_isa_attach(device_t dev)
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{
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struct pcf_softc *sc;
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int rv = ENXIO;
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sc = DEVTOSOFTC(dev);
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mtx_init(&sc->pcf_lock, device_get_nameunit(dev), "pcf", MTX_DEF);
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/* IO port is mandatory */
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sc->res_ioport = bus_alloc_resource_any(dev, SYS_RES_IOPORT,
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&sc->rid_ioport, RF_ACTIVE);
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if (sc->res_ioport == 0) {
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device_printf(dev, "cannot reserve I/O port range\n");
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goto error;
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}
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sc->pcf_flags = device_get_flags(dev);
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if (!(sc->pcf_flags & IIC_POLLED)) {
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sc->res_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &sc->rid_irq,
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RF_ACTIVE);
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if (sc->res_irq == 0) {
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device_printf(dev, "can't reserve irq, polled mode.\n");
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sc->pcf_flags |= IIC_POLLED;
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}
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}
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/* reset the chip */
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pcf_rst_card(dev, IIC_FASTEST, PCF_DEFAULT_ADDR, NULL);
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if (sc->res_irq) {
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rv = bus_setup_intr(dev, sc->res_irq,
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INTR_TYPE_NET /* | INTR_ENTROPY */,
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NULL, pcf_intr, sc, &sc->intr_cookie);
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if (rv) {
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device_printf(dev, "could not setup IRQ\n");
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goto error;
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}
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}
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if ((sc->iicbus = device_add_child(dev, "iicbus", -1)) == NULL)
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device_printf(dev, "could not allocate iicbus instance\n");
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/* probe and attach the iicbus */
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bus_generic_attach(dev);
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return (0);
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error:
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if (sc->res_irq != 0) {
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bus_release_resource(dev, SYS_RES_IRQ, sc->rid_irq,
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sc->res_irq);
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}
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if (sc->res_ioport != 0) {
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bus_release_resource(dev, SYS_RES_IOPORT, sc->rid_ioport,
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sc->res_ioport);
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}
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mtx_destroy(&sc->pcf_lock);
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return (rv);
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}
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static int
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pcf_isa_detach(device_t dev)
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{
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struct pcf_softc *sc;
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int rv;
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sc = DEVTOSOFTC(dev);
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if ((rv = bus_generic_detach(dev)) != 0)
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return (rv);
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if ((rv = device_delete_child(dev, sc->iicbus)) != 0)
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return (rv);
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if (sc->res_irq != 0) {
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bus_teardown_intr(dev, sc->res_irq, sc->intr_cookie);
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bus_release_resource(dev, SYS_RES_IRQ, sc->rid_irq, sc->res_irq);
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}
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bus_release_resource(dev, SYS_RES_IOPORT, sc->rid_ioport, sc->res_ioport);
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mtx_destroy(&sc->pcf_lock);
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return (0);
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}
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DRIVER_MODULE(pcf_isa, isa, pcf_isa_driver, 0, 0);
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