freebsd-dev/sys/dev/scd/scd_isa.c

/*
 * $FreeBSD$
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/conf.h>
#include <sys/fcntl.h>
#include <sys/bio.h>
#include <sys/cdio.h>
#include <sys/disklabel.h>
#include <sys/bus.h>

#include <sys/mutex.h>

#include <machine/bus_pio.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <sys/rman.h>

#include <isa/isavar.h>

#include <dev/scd/scdreg.h>
#include <dev/scd/scdvar.h>

static int	scd_isa_probe	(device_t);
static int	scd_isa_attach	(device_t);
static int	scd_isa_detach	(device_t);

static int	scd_alloc_resources	(device_t);
static void	scd_release_resources	(device_t);

static int
scd_isa_probe (device_t dev)
{
	struct scd_softc *	sc;
	int			error;

	/* No pnp support */
	if (isa_get_vendorid(dev))
		return (ENXIO);

	/* IO port must be configured. */
	if (bus_get_resource_start(dev, SYS_RES_IOPORT, 0) == 0)
		return (ENXIO);

	sc = device_get_softc(dev);
	sc->dev = dev;
	sc->port_rid = 0;
	sc->port_type = SYS_RES_IOPORT;
	error = scd_alloc_resources(dev);
	if (error)
		goto fail;

	error = scd_probe(sc);
	if (error) {
		device_printf(dev, "Probe failed.\n");
		goto fail;
	}

	device_set_desc(dev, sc->data.name);

fail:
	scd_release_resources(dev);
	return (error);
}

static int
scd_isa_attach (device_t dev)
{
	struct scd_softc *	sc;
	int			error;

	sc = device_get_softc(dev);
	error = 0;

	sc->dev = dev;
	sc->port_rid = 0;
	sc->port_type = SYS_RES_IOPORT;
	error = scd_alloc_resources(dev);
	if (error)
		goto fail;

	error = scd_probe(sc);
	if (error) {
		device_printf(dev, "Re-Probe failed.\n");
		goto fail;
	}

	error = scd_attach(sc);
	if (error) {
		device_printf(dev, "Attach failed.\n");
		goto fail;
	}

	return (0);
fail:
	scd_release_resources(dev);
	return (error);
}

static int
scd_isa_detach (device_t dev)
{
	struct scd_softc *	sc;
	int			error;

	sc = device_get_softc(dev);
	error = 0;

	destroy_dev(sc->scd_dev_t);

	scd_release_resources(dev);

	return (error);
}

static int
scd_alloc_resources (device_t dev)
{
	struct scd_softc *	sc;
	int			error;

	sc = device_get_softc(dev);
	error = 0;

	if (sc->port_type) {
		sc->port = bus_alloc_resource(dev, sc->port_type, &sc->port_rid,
				0, ~0, 1, RF_ACTIVE);
		if (sc->port == NULL) {
			device_printf(dev, "Unable to allocate PORT resource.\n");
			error = ENOMEM;
			goto bad;
		}
		sc->port_bst = rman_get_bustag(sc->port);
		sc->port_bsh = rman_get_bushandle(sc->port);
	}

	mtx_init(&sc->mtx, device_get_nameunit(dev),
		"Interrupt lock", MTX_DEF | MTX_RECURSE);

bad:
	return (error);
}

void
scd_release_resources (device_t dev)
{
	struct scd_softc *	sc;

	sc = device_get_softc(dev);

	if (sc->port) {
		bus_release_resource(dev, sc->port_type, sc->port_rid, sc->port);
		sc->port_bst = 0;
		sc->port_bsh = 0;
	}

	if (mtx_initialized(&sc->mtx) != 0)
		mtx_destroy(&sc->mtx);

	return;
}

static device_method_t scd_isa_methods[] = {
	DEVMETHOD(device_probe,         scd_isa_probe),
	DEVMETHOD(device_attach,        scd_isa_attach),
	DEVMETHOD(device_detach,        scd_isa_detach),

	{ 0, 0 }
};

static driver_t scd_isa_driver = {
	"scd",
	scd_isa_methods,
	sizeof(struct scd_softc)
};

static devclass_t	scd_devclass;

DRIVER_MODULE(scd, isa, scd_isa_driver, scd_devclass, NULL, 0);