/*-
 * Copyright (C) 2007-2008 Semihalf, Rafal Jaworowski <raj@semihalf.com>
 * Copyright (C) 2006-2007 Semihalf, Piotr Kruszynski <ppk@semihalf.com>
 * 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 ``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 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.
 */

/*
 * OCP attachment driver for Freescale TSEC controller.
 */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/endian.h>
#include <sys/mbuf.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/socket.h>
#include <sys/sysctl.h>

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

#include <net/ethernet.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_media.h>
#include <net/if_arp.h>

#include <dev/mii/mii.h>
#include <dev/mii/miivar.h>

#include <machine/bootinfo.h>
#include <machine/ocpbus.h>

#include <dev/tsec/if_tsec.h>
#include <dev/tsec/if_tsecreg.h>

#include "miibus_if.h"

#define	OCP_TSEC_RID_TXIRQ	0
#define	OCP_TSEC_RID_RXIRQ	1
#define	OCP_TSEC_RID_ERRIRQ	2

extern struct tsec_softc *tsec0_sc;

static int	tsec_ocp_probe(device_t dev);
static int	tsec_ocp_attach(device_t dev);
static int	tsec_ocp_detach(device_t dev);
static int	tsec_setup_intr(struct tsec_softc *sc, struct resource **ires,
    void **ihand, int *irid, driver_intr_t handler, const char *iname);
static void	tsec_release_intr(struct tsec_softc *sc, struct resource *ires,
    void *ihand, int irid, const char *iname);

static device_method_t tsec_methods[] = {
	/* Device interface */
	DEVMETHOD(device_probe,		tsec_ocp_probe),
	DEVMETHOD(device_attach,	tsec_ocp_attach),
	DEVMETHOD(device_detach,	tsec_ocp_detach),

	DEVMETHOD(device_shutdown,	tsec_shutdown),
	DEVMETHOD(device_suspend,	tsec_suspend),
	DEVMETHOD(device_resume,	tsec_resume),

	/* Bus interface */
	DEVMETHOD(bus_print_child,	bus_generic_print_child),
	DEVMETHOD(bus_driver_added,	bus_generic_driver_added),

	/* MII interface */
	DEVMETHOD(miibus_readreg,	tsec_miibus_readreg),
	DEVMETHOD(miibus_writereg,	tsec_miibus_writereg),
	DEVMETHOD(miibus_statchg,	tsec_miibus_statchg),
	{ 0, 0 }
};

static driver_t tsec_ocp_driver = {
	"tsec",
	tsec_methods,
	sizeof(struct tsec_softc),
};

DRIVER_MODULE(tsec, ocpbus, tsec_ocp_driver, tsec_devclass, 0, 0);
MODULE_DEPEND(tsec, ocpbus, 1, 1, 1);
MODULE_DEPEND(tsec, ether, 1, 1, 1);

static int
tsec_ocp_probe(device_t dev)
{
	struct tsec_softc *sc;
	device_t parent;
	uintptr_t devtype;
	int error;
	uint32_t id;

	parent = device_get_parent(dev);

	error = BUS_READ_IVAR(parent, dev, OCPBUS_IVAR_DEVTYPE, &devtype);
	if (error)
		return (error);
	if (devtype != OCPBUS_DEVTYPE_TSEC)
		return (ENXIO);

	sc = device_get_softc(dev);

	sc->sc_rrid = 0;
	sc->sc_rres = bus_alloc_resource(dev, SYS_RES_MEMORY, &sc->sc_rrid,
	    0ul, ~0ul, TSEC_IO_SIZE, RF_ACTIVE);
	if (sc->sc_rres == NULL)
		return (ENXIO);

	sc->sc_bas.bsh = rman_get_bushandle(sc->sc_rres);
	sc->sc_bas.bst = rman_get_bustag(sc->sc_rres);

	/* Check that we actually have a TSEC at this address */
	id = TSEC_READ(sc, TSEC_REG_ID) | TSEC_READ(sc, TSEC_REG_ID2);

	bus_release_resource(dev, SYS_RES_MEMORY, sc->sc_rrid, sc->sc_rres);

	if (id == 0)
		return (ENXIO);

	device_set_desc(dev, "Three-Speed Ethernet Controller");
	return (BUS_PROBE_DEFAULT);
}

static int
tsec_ocp_attach(device_t dev)
{
	struct tsec_softc *sc;
	int error = 0;

	sc = device_get_softc(dev);
	sc->dev = dev;

	/* XXX add comment on weird FSL's MII registers access design */
	if (device_get_unit(dev) == 0)
		tsec0_sc = sc;

	/* Init timer */
	callout_init(&sc->tsec_callout, 1);

	/* Init locks */
	mtx_init(&sc->transmit_lock, device_get_nameunit(dev), "TSEC TX lock",
	    MTX_DEF);
	mtx_init(&sc->receive_lock, device_get_nameunit(dev), "TSEC RX lock",
	    MTX_DEF);
	
	/* Allocate IO memory for TSEC registers */
	sc->sc_rrid = 0;
	sc->sc_rres = bus_alloc_resource(dev, SYS_RES_MEMORY, &sc->sc_rrid,
	    0ul, ~0ul, TSEC_IO_SIZE, RF_ACTIVE);
	if (sc->sc_rres == NULL) {
		device_printf(dev, "could not allocate IO memory range!\n");
		goto fail1;
	}
	sc->sc_bas.bsh = rman_get_bushandle(sc->sc_rres);
	sc->sc_bas.bst = rman_get_bustag(sc->sc_rres);

	/* TSEC attach */
	if (tsec_attach(sc) != 0) {
		device_printf(dev, "could not be configured\n");
		goto fail2;
	}

	/* Set up interrupts (TX/RX/ERR) */
	sc->sc_transmit_irid = OCP_TSEC_RID_TXIRQ;
	error = tsec_setup_intr(sc, &sc->sc_transmit_ires,
	    &sc->sc_transmit_ihand, &sc->sc_transmit_irid,
	    tsec_transmit_intr, "TX");
	if (error)
		goto fail2;

	sc->sc_receive_irid = OCP_TSEC_RID_RXIRQ;
	error = tsec_setup_intr(sc, &sc->sc_receive_ires,
	    &sc->sc_receive_ihand, &sc->sc_receive_irid,
	    tsec_receive_intr, "RX");
	if (error)
		goto fail3;

	sc->sc_error_irid = OCP_TSEC_RID_ERRIRQ;
	error = tsec_setup_intr(sc, &sc->sc_error_ires,
	    &sc->sc_error_ihand, &sc->sc_error_irid,
	    tsec_error_intr, "ERR");
	if (error)
		goto fail4;

	return (0);

fail4:
	tsec_release_intr(sc, sc->sc_receive_ires, sc->sc_receive_ihand,
	    sc->sc_receive_irid, "RX");
fail3:
	tsec_release_intr(sc, sc->sc_transmit_ires, sc->sc_transmit_ihand,
	    sc->sc_transmit_irid, "TX");
fail2:
	bus_release_resource(dev, SYS_RES_MEMORY, sc->sc_rrid, sc->sc_rres);
fail1:
	mtx_destroy(&sc->receive_lock);
	mtx_destroy(&sc->transmit_lock);
	return (ENXIO);
}

static int
tsec_setup_intr(struct tsec_softc *sc, struct resource **ires, void **ihand,
    int *irid, driver_intr_t handler, const char *iname)
{
	int error;

	(*ires) = bus_alloc_resource_any(sc->dev, SYS_RES_IRQ, irid, RF_ACTIVE);
	if ((*ires) == NULL) {
		device_printf(sc->dev, "could not allocate %s IRQ\n", iname);
		return (ENXIO);
	}
	error = bus_setup_intr(sc->dev, *ires, INTR_TYPE_NET | INTR_MPSAFE,
	    NULL, handler, sc, ihand);
	if (error) {
		device_printf(sc->dev, "failed to set up %s IRQ\n", iname);
		if (bus_release_resource(sc->dev, SYS_RES_IRQ, *irid, *ires))
			device_printf(sc->dev, "could not release %s IRQ\n", iname);
		(*ires) = NULL;
		return (error);
	}
	return (0);
}

static void
tsec_release_intr(struct tsec_softc *sc, struct resource *ires, void *ihand,
    int irid, const char *iname)
{
	int error;

	if (ires == NULL)
		return;

	error = bus_teardown_intr(sc->dev, ires, ihand);
	if (error)
		device_printf(sc->dev, "bus_teardown_intr() failed for %s intr"
		    ", error %d\n", iname, error);

	error = bus_release_resource(sc->dev, SYS_RES_IRQ, irid, ires);
	if (error)
		device_printf(sc->dev, "bus_release_resource() failed for %s intr"
		    ", error %d\n", iname, error);
}

static int
tsec_ocp_detach(device_t dev)
{
	struct tsec_softc *sc;
	int error;

	sc = device_get_softc(dev);

	/* Wait for stopping watchdog */
	callout_drain(&sc->tsec_callout);

	/* Stop and release all interrupts */
	tsec_release_intr(sc, sc->sc_transmit_ires, sc->sc_transmit_ihand,
	    sc->sc_transmit_irid, "TX");
	tsec_release_intr(sc, sc->sc_receive_ires, sc->sc_receive_ihand,
	    sc->sc_receive_irid, "RX");
	tsec_release_intr(sc, sc->sc_error_ires, sc->sc_error_ihand,
	    sc->sc_error_irid, "ERR");

	/* TSEC detach */
	tsec_detach(sc);

	/* Free IO memory handler */
	if (sc->sc_rres) {
		error = bus_release_resource(dev, SYS_RES_MEMORY, sc->sc_rrid,
		    sc->sc_rres);
		if (error)
			device_printf(dev, "bus_release_resource() failed for"
			    " IO memory, error %d\n", error);
	}

	/* Destroy locks */
	mtx_destroy(&sc->receive_lock);
	mtx_destroy(&sc->transmit_lock);
	return (0);
}

void
tsec_get_hwaddr(struct tsec_softc *sc, uint8_t *addr)
{
	union {
		uint32_t reg[2];
		uint8_t addr[6];
	} curmac;
	uint32_t a[6];
	device_t parent;
	uintptr_t macaddr;
	int i;

	parent = device_get_parent(sc->dev);
	if (BUS_READ_IVAR(parent, sc->dev, OCPBUS_IVAR_MACADDR,
	    &macaddr) == 0) {
		bcopy((uint8_t *)macaddr, addr, 6);
		return;
	}

	/*
	 * Fall back -- use the currently programmed address in the hope that
	 * it was set be firmware...
	 */
	curmac.reg[0] = TSEC_READ(sc, TSEC_REG_MACSTNADDR1);
	curmac.reg[1] = TSEC_READ(sc, TSEC_REG_MACSTNADDR2);
	for (i = 0; i < 6; i++)
		a[5-i] = curmac.addr[i];

	addr[0] = a[0];
	addr[1] = a[1];
	addr[2] = a[2];
	addr[3] = a[3];
	addr[4] = a[4];
	addr[5] = a[5];
}