diff options
Diffstat (limited to 'sys/dev/pcf/pcf_isa.c')
| -rw-r--r-- | sys/dev/pcf/pcf_isa.c | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/sys/dev/pcf/pcf_isa.c b/sys/dev/pcf/pcf_isa.c new file mode 100644 index 0000000..0b0968a --- /dev/null +++ b/sys/dev/pcf/pcf_isa.c @@ -0,0 +1,185 @@ +/*- + * 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/systm.h> +#include <sys/bus.h> +#include <sys/kernel.h> +#include <sys/resource.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" + +static int pcf_probe(device_t); +static int pcf_attach(device_t); +static int pcf_detach(device_t); + +static device_method_t pcf_methods[] = { + /* device interface */ + DEVMETHOD(device_probe, pcf_probe), + DEVMETHOD(device_attach, pcf_attach), + DEVMETHOD(device_detach, pcf_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_devclass; + +static driver_t pcf_driver = { + "pcf", + pcf_methods, + sizeof(struct pcf_softc), +}; + +static int +pcf_probe(device_t dev) +{ + + device_set_desc(dev, "PCF8584 I2C bus controller"); + return (0); +} + +static int +pcf_attach(device_t dev) +{ + struct pcf_softc *sc; + int rv = ENXIO; + + sc = DEVTOSOFTC(dev); + bzero(sc, sizeof(struct pcf_softc)); + + /* 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); + + rv = BUS_SETUP_INTR(device_get_parent(dev), dev, sc->res_irq, + INTR_TYPE_NET /* | INTR_ENTROPY */, + 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_deactivate_resource(dev, SYS_RES_IRQ, sc->rid_irq, + sc->res_irq); + bus_release_resource(dev, SYS_RES_IRQ, sc->rid_irq, + sc->res_irq); + } + if (sc->res_ioport != 0) { + bus_deactivate_resource(dev, SYS_RES_IOPORT, sc->rid_ioport, + sc->res_ioport); + bus_release_resource(dev, SYS_RES_IOPORT, sc->rid_ioport, + sc->res_ioport); + } + return (rv); +} + +static int +pcf_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(device_get_parent(dev), dev, sc->res_irq, + sc->intr_cookie); + bus_deactivate_resource(dev, SYS_RES_IRQ, sc->rid_irq, sc->res_irq); + bus_release_resource(dev, SYS_RES_IRQ, sc->rid_irq, sc->res_irq); + } + + bus_deactivate_resource(dev, SYS_RES_IOPORT, sc->rid_ioport, sc->res_ioport); + bus_release_resource(dev, SYS_RES_IOPORT, sc->rid_ioport, sc->res_ioport); + + return (0); +} + +DRIVER_MODULE(pcf, ebus, pcf_driver, pcf_devclass, 0, 0); +MODULE_DEPEND(pcf, iicbus, PCF_MINVER, PCF_PREFVER, PCF_MAXVER); +MODULE_VERSION(pcf, PCF_MODVER); |
