/*	$NetBSD: if_ep_isa.c,v 1.47 2019/12/27 04:50:41 msaitoh Exp $	*/

/*-
 * Copyright (c) 1996, 1997 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
 * NASA Ames Research Center.
 *
 * 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.
 */

/*
 * Copyright (c) 1997 Jonathan Stone <jonathan@NetBSD.org>
 * Copyright (c) 1994 Herb Peyerl <hpeyerl@beer.org>
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Herb Peyerl.
 * 4. The name of Herb Peyerl may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * 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.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_ep_isa.c,v 1.47 2019/12/27 04:50:41 msaitoh Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/errno.h>
#include <sys/syslog.h>
#include <sys/select.h>
#include <sys/device.h>
#include <sys/queue.h>

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

#include <sys/cpu.h>
#include <sys/bus.h>
#include <sys/intr.h>

#include <dev/mii/miivar.h>

#include <dev/ic/elink3var.h>
#include <dev/ic/elink3reg.h>

#include <dev/isa/isavar.h>
#include <dev/isa/elink.h>

int ep_isa_probe(device_t , cfdata_t , void *);
void ep_isa_attach(device_t , device_t , void *);

CFATTACH_DECL_NEW(ep_isa, sizeof(struct ep_softc),
    ep_isa_probe, ep_isa_attach, NULL, NULL);

static	void epaddcard(int, int, int, int);

/*
 * This keeps track of which ISAs have been through an ep probe sequence.
 * A simple static variable isn't enough, since it's conceivable that
 * a system might have more than one ISA bus.
 *
 * The "er_bus" member is the unit number of the parent ISA bus, e.g. "0"
 * for "isa0".
 */
struct ep_isa_done_probe {
	LIST_ENTRY(ep_isa_done_probe)	er_link;
	int				er_bus;
};
static LIST_HEAD(, ep_isa_done_probe) ep_isa_all_probes;
static int ep_isa_probes_initialized;

#define MAXEPCARDS	20	/* if you have more than 20, you lose */

static struct epcard {
	int	bus;
	int	iobase;
	int	irq;
	char	available;
	long	model;
} epcards[MAXEPCARDS];
static int nepcards;

static void
epaddcard(int bus, int iobase, int irq, int model)
{

	if (nepcards >= MAXEPCARDS)
		return;
	epcards[nepcards].bus = bus;
	epcards[nepcards].iobase = iobase;
	epcards[nepcards].irq = (irq == 2) ? 9 : irq;
	epcards[nepcards].model = model;
	epcards[nepcards].available = 1;
	nepcards++;
}

/*
 * 3c509 cards on the ISA bus are probed in ethernet address order.
 * The probe sequence requires careful orchestration, and we'd like
 * to allow the irq and base address to be wildcarded. So, we
 * probe all the cards the first time epprobe() is called. On subsequent
 * calls we look for matching cards.
 */
int
ep_isa_probe(device_t parent, cfdata_t match, void *aux)
{
	struct isa_attach_args *ia = aux;
	bus_space_tag_t iot = ia->ia_iot;
	bus_space_handle_t ioh;
	int slot, iobase, irq, i;
	u_int16_t vendor, model, eeprom_addr_cfg;
	struct ep_isa_done_probe *er;
	int bus = device_unit(parent);

	if (ISA_DIRECT_CONFIG(ia))
		return (0);

	if (ep_isa_probes_initialized == 0) {
		LIST_INIT(&ep_isa_all_probes);
		ep_isa_probes_initialized = 1;
	}

	/*
	 * Probe this bus if we haven't done so already.
	 */
	for (er = ep_isa_all_probes.lh_first; er != NULL;
	    er = er->er_link.le_next)
		if (er->er_bus == device_unit(parent))
			goto bus_probed;

	/*
	 * Mark this bus so we don't probe it again.
	 */
	er = malloc(sizeof(struct ep_isa_done_probe), M_DEVBUF, M_WAITOK);
	er->er_bus = bus;
	LIST_INSERT_HEAD(&ep_isa_all_probes, er, er_link);

	/*
	 * Map the Etherlink ID port for the probe sequence.
	 */
	if (bus_space_map(iot, ELINK_ID_PORT, 1, 0, &ioh)) {
		printf("ep_isa_probe: can't map Etherlink ID port\n");
		return 0;
	}

	for (slot = 0; slot < MAXEPCARDS; slot++) {
		elink_reset(iot, ioh, device_unit(parent));
		elink_idseq(iot, ioh, ELINK_509_POLY);

		/* Untag all the adapters so they will talk to us. */
		if (slot == 0)
			bus_space_write_1(iot, ioh, 0, TAG_ADAPTER + 0);

		vendor = bswap16(epreadeeprom(iot, ioh, EEPROM_MFG_ID));
		if (vendor != MFG_ID)
			continue;

		model = bswap16(epreadeeprom(iot, ioh, EEPROM_PROD_ID));
		/*
		 * XXX: Add a new product id to check for other cards
		 * (3c515?) and fix the check in ep_isa_attach.
		 */
		if ((model & 0xfff0) != PROD_ID_3C509) {
#ifndef trusted
			printf(
			 "ep_isa_probe: ignoring model %04x\n", model);
#endif
			continue;
			}

		eeprom_addr_cfg = epreadeeprom(iot, ioh, EEPROM_ADDR_CFG);
		iobase = (eeprom_addr_cfg & 0x1f) * 0x10 + 0x200;

		irq = epreadeeprom(iot, ioh, EEPROM_RESOURCE_CFG);
		irq >>= 12;

		/* XXX Should ignore card if non-ISA(EISA) io address? -chb */

		/*
		 * Don't attach a 3c509 in PnP mode.
		 * PnP mode was added with the 3C509B.
		 * Check some EEPROM registers to make sure this is really
		 * a 3C509B and test whether it is in PnP mode.
		 */
		if ((model & 0xfff0) == PROD_ID_3C509) {
			u_int16_t cksum, eepromrev, eeprom_cap, eeprom_hi;


			/*
			 * Fetch all the info we need to ascertain whether
			 * the card is  PnP capable and in PnP mode.
			 * Skip over PnP cards.
			 */

			/* secondary configurable data checksum */
			cksum = epreadeeprom(iot, ioh, EEPROM_CHECKSUM_EL3)
			    & 0xFF;
			for (i = EEPROM_CONFIG_HIGH;
			    i < EEPROM_CHECKSUM_EL3; i++) {
				cksum ^= epreadeeprom(iot, ioh, i);
			}
			cksum = (cksum & 0xFF) ^ ((cksum >> 8) & 0xFF);

			eepromrev = epreadeeprom(iot, ioh, EEPROM_SSI);
			eeprom_hi = epreadeeprom(iot, ioh, EEPROM_CONFIG_HIGH);
			eeprom_cap = epreadeeprom(iot, ioh, EEPROM_CAP);

			/*
			 * Stop card responding to contention in future.
			 * (NB: stops rsponse to all reads from ID port.)
			 */
			bus_space_write_1(iot, ioh, 0, TAG_ADAPTER + 1);

			if (cksum != 0) {
#if 0
				printf("ep_isa_probe: cksum mismatch 0x%02x\n",
				    (int)cksum);
#endif
			}
			else if ((eepromrev & 0xF) < 1) {
				/* 3C509B is adapter revision level 1. */
#if 0
				printf("ep_isa_probe: revision level 0\n");
#endif
			}
			else if (eeprom_cap != 0x2083) {
#if 0
				printf("ep_isa_probe: capabilities word mismatch0x%03x\n",
				    (int)epreadeeprom(iot, ioh, EEPROM_CAP));
#endif
			}
			else
			  /*
			   * we have a 3c509B with PnP capabilities.
			   * Test partly documented bits which toggle when
			   * in PnP mode.
			   */
			if ((eeprom_hi & 0x8) != 0 || ((eeprom_hi & 0xc) == 0 &&
			    (eeprom_addr_cfg & 0x80) != 0)) {
				printf("3COM 3C509B Ethernet card in PnP mode\n");
				continue;
			}
		}

		/*
		 * XXX: this should probably not be done here
		 * because it enables the drq/irq lines from
		 * the board. Perhaps it should be done after
		 * we have checked for irq/drq collisions?
		 *
		 * According to the 3COM docs, this does not enable
		 * the irq lines. -chb
		 */
		bus_space_write_1(iot, ioh, 0, ACTIVATE_ADAPTER_TO_CONFIG);

		epaddcard(bus, iobase, irq, model);
	}
	/* XXX should we sort by ethernet address? */

	bus_space_unmap(iot, ioh, 1);

bus_probed:

	if (ia->ia_nio < 1)
		return (0);
	if (ia->ia_nirq < 1)
		return (0);

	for (i = 0; i < nepcards; i++) {
		if (epcards[i].bus != bus)
			continue;
		if (epcards[i].available == 0)
			continue;

		if (ia->ia_io[0].ir_addr != ISA_UNKNOWN_PORT &&
		    ia->ia_io[0].ir_addr != epcards[i].iobase)
			continue;

		if (ia->ia_irq[0].ir_irq != ISA_UNKNOWN_IRQ &&
		    ia->ia_irq[0].ir_irq != epcards[i].irq)
			continue;

		goto good;
	}
	return 0;

good:
	epcards[i].available = 0;

	ia->ia_nio = 1;
	ia->ia_io[0].ir_addr = epcards[i].iobase;
	ia->ia_io[0].ir_size = 0x10;

	ia->ia_nirq = 1;
	ia->ia_irq[0].ir_irq = epcards[i].irq;

	ia->ia_niomem = 0;
	ia->ia_ndrq = 0;

	ia->ia_aux = (void *)epcards[i].model;
	return 1;
}

void
ep_isa_attach(device_t parent, device_t self, void *aux)
{
	struct ep_softc *sc = device_private(self);
	struct isa_attach_args *ia = aux;
	bus_space_tag_t iot = ia->ia_iot;
	bus_space_handle_t ioh;
	int chipset;

	/* Map i/o space. */
	if (bus_space_map(iot, ia->ia_io[0].ir_addr, 0x10, 0, &ioh)) {
		aprint_error(": can't map i/o space\n");
		return;
	}

	sc->sc_dev = self;
	sc->sc_iot = iot;
	sc->sc_ioh = ioh;
	sc->bustype = ELINK_BUS_ISA;

	sc->enable = NULL;
	sc->disable = NULL;
	sc->enabled = 1;

	chipset = (int)(long)ia->ia_aux;
	if ((chipset & 0xfff0) == PROD_ID_3C509) {
		aprint_normal(": 3Com 3C509 Ethernet\n");
		epconfig(sc, ELINK_CHIPSET_3C509, NULL);
	} else {
		/*
		 * XXX: Maybe a 3c515, but the check in ep_isa_probe looks
		 * at the moment only for a 3c509.
		 */
		aprint_error(": unknown 3Com Ethernet card: %04x\n", chipset);
		return;
	}

	sc->sc_ih = isa_intr_establish(ia->ia_ic, ia->ia_irq[0].ir_irq,
	    IST_EDGE, IPL_NET, epintr, sc);
}