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/*-
* Copyright (c) 2004 Joerg Wunsch
*
* derived from sys/i386/isa/pcf.c which is:
*
* Copyright (c) 1998 Nicolas Souchu, Marc Bouget
* 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.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, 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 DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* Hardware driver for a Philips PCF8584 I2C bus controller sitting
* on a generic ISA bus.
*/
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/lock.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/resource.h>
#include <sys/systm.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <sys/rman.h>
#include <isa/isareg.h>
#include <isa/isavar.h>
#include <dev/iicbus/iiconf.h>
#include <dev/pcf/pcfvar.h>
#include "iicbus_if.h"
#define PCF_NAME "pcf"
static void pcf_isa_identify(driver_t *, device_t);
static int pcf_isa_probe(device_t);
static int pcf_isa_attach(device_t);
static int pcf_isa_detach(device_t);
static device_method_t pcf_isa_methods[] = {
/* device interface */
DEVMETHOD(device_identify, pcf_isa_identify),
DEVMETHOD(device_probe, pcf_isa_probe),
DEVMETHOD(device_attach, pcf_isa_attach),
DEVMETHOD(device_detach, pcf_isa_detach),
/* iicbus interface */
DEVMETHOD(iicbus_callback, iicbus_null_callback),
DEVMETHOD(iicbus_repeated_start, pcf_repeated_start),
DEVMETHOD(iicbus_start, pcf_start),
DEVMETHOD(iicbus_stop, pcf_stop),
DEVMETHOD(iicbus_write, pcf_write),
DEVMETHOD(iicbus_read, pcf_read),
DEVMETHOD(iicbus_reset, pcf_rst_card),
{ 0, 0 }
};
static devclass_t pcf_isa_devclass;
static driver_t pcf_isa_driver = {
PCF_NAME,
pcf_isa_methods,
sizeof(struct pcf_softc),
};
static void
pcf_isa_identify(driver_t *driver, device_t parent)
{
BUS_ADD_CHILD(parent, ISA_ORDER_SPECULATIVE, PCF_NAME, 0);
return;
}
static int
pcf_isa_probe(device_t dev)
{
rman_res_t start, count;
u_int rid = 0, port, error;
/* skip PnP probes */
if (isa_get_logicalid(dev))
return (ENXIO);
/* The port address must be explicitly specified */
bus_get_resource(dev, SYS_RES_IOPORT, rid, &start, &count);
if ((error = resource_int_value(PCF_NAME, 0, "port", &port) != 0))
return (error);
/* Probe is only successful for the specified base io */
if (port != (u_int)start)
return (ENXIO);
device_set_desc(dev, "PCF8584 I2C bus controller");
return (0);
}
static int
pcf_isa_attach(device_t dev)
{
struct pcf_softc *sc;
int rv = ENXIO;
sc = DEVTOSOFTC(dev);
mtx_init(&sc->pcf_lock, device_get_nameunit(dev), "pcf", MTX_DEF);
/* IO port is mandatory */
sc->res_ioport = bus_alloc_resource_any(dev, SYS_RES_IOPORT,
&sc->rid_ioport, RF_ACTIVE);
if (sc->res_ioport == 0) {
device_printf(dev, "cannot reserve I/O port range\n");
goto error;
}
sc->pcf_flags = device_get_flags(dev);
if (!(sc->pcf_flags & IIC_POLLED)) {
sc->res_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &sc->rid_irq,
RF_ACTIVE);
if (sc->res_irq == 0) {
device_printf(dev, "can't reserve irq, polled mode.\n");
sc->pcf_flags |= IIC_POLLED;
}
}
/* reset the chip */
pcf_rst_card(dev, IIC_FASTEST, PCF_DEFAULT_ADDR, NULL);
if (sc->res_irq) {
rv = bus_setup_intr(dev, sc->res_irq,
INTR_TYPE_NET /* | INTR_ENTROPY */,
NULL, pcf_intr, sc, &sc->intr_cookie);
if (rv) {
device_printf(dev, "could not setup IRQ\n");
goto error;
}
}
if ((sc->iicbus = device_add_child(dev, "iicbus", -1)) == NULL)
device_printf(dev, "could not allocate iicbus instance\n");
/* probe and attach the iicbus */
bus_generic_attach(dev);
return (0);
error:
if (sc->res_irq != 0) {
bus_release_resource(dev, SYS_RES_IRQ, sc->rid_irq,
sc->res_irq);
}
if (sc->res_ioport != 0) {
bus_release_resource(dev, SYS_RES_IOPORT, sc->rid_ioport,
sc->res_ioport);
}
mtx_destroy(&sc->pcf_lock);
return (rv);
}
static int
pcf_isa_detach(device_t dev)
{
struct pcf_softc *sc;
int rv;
sc = DEVTOSOFTC(dev);
if ((rv = bus_generic_detach(dev)) != 0)
return (rv);
if ((rv = device_delete_child(dev, sc->iicbus)) != 0)
return (rv);
if (sc->res_irq != 0) {
bus_teardown_intr(dev, sc->res_irq, sc->intr_cookie);
bus_release_resource(dev, SYS_RES_IRQ, sc->rid_irq, sc->res_irq);
}
bus_release_resource(dev, SYS_RES_IOPORT, sc->rid_ioport, sc->res_ioport);
mtx_destroy(&sc->pcf_lock);
return (0);
}
DRIVER_MODULE(pcf_isa, isa, pcf_isa_driver, pcf_isa_devclass, 0, 0);
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