/*	$NetBSD: if_le.c,v 1.41 2019/05/29 06:21:58 msaitoh Exp $	*/

/*-
 * Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Charles M. Hannum; Jason R. Thorpe of the Numerical Aerospace
 * Simulation Facility, NASA Ames Research Center; Paul Kranenburg.
 *
 * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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>
__KERNEL_RCSID(0, "$NetBSD: if_le.c,v 1.41 2019/05/29 06:21:58 msaitoh Exp $");

#include "opt_inet.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/syslog.h>
#include <sys/socket.h>
#include <sys/device.h>
#include <sys/malloc.h>

#include <net/if.h>
#include <net/if_ether.h>
#include <net/if_media.h>

#include <sys/bus.h>
#include <sys/intr.h>
#include <machine/autoconf.h>

#include <dev/sbus/sbusvar.h>
#include <dev/sbus/lebuffervar.h>	/*XXX*/

#include <dev/ic/lancereg.h>
#include <dev/ic/lancevar.h>
#include <dev/ic/am7990reg.h>
#include <dev/ic/am7990var.h>

#include "ioconf.h"

/*
 * LANCE registers.
 */
#define LEREG1_RDP	0	/* Register Data port */
#define LEREG1_RAP	2	/* Register Address port */

struct	le_softc {
	struct	am7990_softc	sc_am7990;	/* glue to MI code */
	bus_space_tag_t		sc_bustag;
	bus_dma_tag_t		sc_dmatag;
	bus_dmamap_t		sc_dmamap;
	bus_space_handle_t	sc_reg;
};

#define MEMSIZE 0x4000		/* LANCE memory size */

int	lematch_sbus(device_t, cfdata_t, void *);
void	leattach_sbus(device_t, device_t, void *);

/*
 * Media types supported.
 */
static int lemedia[] = {
	IFM_ETHER | IFM_10_5,
};
#define NLEMEDIA	__arraycount(lemedia)

CFATTACH_DECL_NEW(le_sbus, sizeof(struct le_softc),
    lematch_sbus, leattach_sbus, NULL, NULL);

#if defined(_KERNEL_OPT)
#include "opt_ddb.h"
#endif

static void lewrcsr(struct lance_softc *, uint16_t, uint16_t);
static uint16_t lerdcsr(struct lance_softc *, uint16_t);

static void
lewrcsr(struct lance_softc *sc, uint16_t port, uint16_t val)
{
	struct le_softc *lesc = (struct le_softc *)sc;
	bus_space_tag_t t = lesc->sc_bustag;
	bus_space_handle_t h = lesc->sc_reg;

	bus_space_write_2(t, h, LEREG1_RAP, port);
	bus_space_write_2(t, h, LEREG1_RDP, val);

#if defined(SUN4M)
	/*
	 * We need to flush the Sbus->Mbus write buffers. This can most
	 * easily be accomplished by reading back the register that we
	 * just wrote (thanks to Chris Torek for this solution).
	 */
	(void)bus_space_read_2(t, h, LEREG1_RDP);
#endif
}

static uint16_t
lerdcsr(struct lance_softc *sc, uint16_t port)
{
	struct le_softc *lesc = (struct le_softc *)sc;
	bus_space_tag_t t = lesc->sc_bustag;
	bus_space_handle_t h = lesc->sc_reg;

	bus_space_write_2(t, h, LEREG1_RAP, port);
	return (bus_space_read_2(t, h, LEREG1_RDP));
}


int
lematch_sbus(device_t parent, cfdata_t cf, void *aux)
{
	struct sbus_attach_args *sa = aux;

	return (strcmp(cf->cf_name, sa->sa_name) == 0);
}

void
leattach_sbus(device_t parent, device_t self, void *aux)
{
	struct le_softc *lesc = device_private(self);
	struct lance_softc *sc = &lesc->sc_am7990.lsc;
	struct sbus_attach_args *sa = aux;
	bus_dma_tag_t dmatag;
	cfdriver_t lebufcd;

	sc->sc_dev = self;
	lesc->sc_bustag = sa->sa_bustag;
	lesc->sc_dmatag = dmatag = sa->sa_dmatag;

	if (sbus_bus_map(sa->sa_bustag,
			 sa->sa_slot,
			 sa->sa_offset,
			 sa->sa_size,
			 0, &lesc->sc_reg) != 0) {
		aprint_error(": cannot map registers\n");
		return;
	}

	/*
	 * Look for an "unallocated" lebuffer and pair it with
	 * this `le' device on the assumption that we're on
	 * a pre-historic ROM that doesn't establish le<=>lebuffer
	 * parent-child relationships.
	 */
	lebufcd = config_cfdriver_lookup("lebuffer");
	if (lebufcd != NULL) {
		int unit;

		/* Check all possible lebuffer units */
		for (unit = 0; unit < lebufcd->cd_ndevs; unit++) {
			device_t lebufdev;
			struct lebuf_softc *lebufsc;

			/* Check if unit is valid */
			lebufdev = device_lookup(lebufcd, unit);
			if (lebufdev == NULL)
				continue;

			/* Check if we have a common sbus parent */
			if (parent != device_parent(lebufdev))
				continue;
			lebufsc = device_private(lebufdev);

			/*
			 * Check if this lebuffer unit is attached
			 * but unused by its child, if_le_lebuffer.
			 * XXX: this won't work if lebuffer is configured
			 *      but not le at lebuffer?
			 */
			if (lebufsc->sc_buffer == 0 || lebufsc->attached != 0)
				continue;

			/* Assume this lebuffer is my pair */
			sc->sc_mem = lebufsc->sc_buffer;
			sc->sc_memsize = lebufsc->sc_bufsiz;

			/* Lance view is offset by buffer location */
			sc->sc_addr = 0;

			/* Denote it */
			aprint_normal(" (%s)", device_xname(lebufdev));
			lebufsc->attached = 1;

			/* That old black magic... */
			sc->sc_conf3 = prom_getpropint(sa->sa_node,
			    "busmaster-regval",
			    LE_C3_BSWP | LE_C3_ACON | LE_C3_BCON);
			break;
		}
	}

	if (sc->sc_mem == 0) {
		bus_dma_segment_t seg;
		int rseg, error;

#ifndef BUS_DMA_24BIT
/* XXX - This flag is not defined on all archs */
#define BUS_DMA_24BIT	0
#endif
		/* Get a DMA handle */
		if ((error = bus_dmamap_create(dmatag, MEMSIZE, 1, MEMSIZE, 0,
		    BUS_DMA_NOWAIT | BUS_DMA_24BIT, &lesc->sc_dmamap)) != 0) {
			aprint_error(": DMA map create error %d\n", error);
			return;
		}

		/* Allocate DMA buffer */
		if ((error = bus_dmamem_alloc(dmatag, MEMSIZE, 0, 0,
		    &seg, 1, &rseg, BUS_DMA_NOWAIT | BUS_DMA_24BIT)) != 0) {
			aprint_error(": DMA buffer allocation error %d\n",
			    error);
			return;
		}

		/* Map DMA buffer into kernel space */
		if ((error = bus_dmamem_map(dmatag, &seg, rseg, MEMSIZE,
		    (void **)&sc->sc_mem, BUS_DMA_NOWAIT | BUS_DMA_COHERENT))
		    != 0) {
			aprint_error(": DMA buffer map error %d\n", error);
			bus_dmamem_free(lesc->sc_dmatag, &seg, rseg);
			return;
		}

		/* Load DMA buffer */
		if ((error = bus_dmamap_load(dmatag, lesc->sc_dmamap,
		    sc->sc_mem, MEMSIZE, NULL, BUS_DMA_NOWAIT)) != 0) {
			aprint_error(": DMA buffer map load error %d\n", error);
			bus_dmamem_free(dmatag, &seg, rseg);
			bus_dmamem_unmap(dmatag, sc->sc_mem, MEMSIZE);
			return;
		}

		sc->sc_addr = lesc->sc_dmamap->dm_segs[0].ds_addr & 0xffffff;
		sc->sc_memsize = MEMSIZE;
		sc->sc_conf3 = LE_C3_BSWP | LE_C3_ACON | LE_C3_BCON;
	}

	prom_getether(sa->sa_node, sc->sc_enaddr);

	sc->sc_supmedia = lemedia;
	sc->sc_nsupmedia = NLEMEDIA;
	sc->sc_defaultmedia = lemedia[0];

	sc->sc_copytodesc = lance_copytobuf_contig;
	sc->sc_copyfromdesc = lance_copyfrombuf_contig;
	sc->sc_copytobuf = lance_copytobuf_contig;
	sc->sc_copyfrombuf = lance_copyfrombuf_contig;
	sc->sc_zerobuf = lance_zerobuf_contig;

	sc->sc_rdcsr = lerdcsr;
	sc->sc_wrcsr = lewrcsr;

	am7990_config(&lesc->sc_am7990);

	/* Establish interrupt handler */
	if (sa->sa_nintr != 0)
		(void)bus_intr_establish(lesc->sc_bustag, sa->sa_pri,
					 IPL_NET, am7990_intr, sc);
}