/*      $NetBSD: if_tlp_eisa.c,v 1.30 2023/12/20 04:32:30 thorpej Exp $ */

/*-
* Copyright (c) 1999, 2000 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.
*/

/*
* EISA bus front-end for the Digital Semiconductor ``Tulip'' (21x4x)
* Ethernet controller family driver.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_tlp_eisa.c,v 1.30 2023/12/20 04:32:30 thorpej Exp $");

#include "opt_inet.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/kmem.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/errno.h>
#include <sys/device.h>

#include <machine/endian.h>

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

#ifdef INET
#include <netinet/in.h>
#include <netinet/if_inarp.h>
#endif


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

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

#include <dev/ic/tulipreg.h>
#include <dev/ic/tulipvar.h>

#include <dev/eisa/eisareg.h>
#include <dev/eisa/eisavar.h>
#include <dev/eisa/eisadevs.h>

#include <dev/pci/pcireg.h>

/*
* DE425 configuration registers; literal offsets from CSR base.
* This is effectively the 21040 PCI configuration space interleaved
* into the CSR space (CSRs are space 16 bytes on the DE425).
*
* What a cool address decoder hack they must have on that board...
*/
#define DE425_CFID              0x08    /* Configuration ID */
#define DE425_CFCS              0x0c    /* Configuration Command-Status */
#define DE425_CFRV              0x18    /* Configuration Revision */
#define DE425_CFLT              0x1c    /* Configuration Latency Timer */
#define DE425_CBIO              0x28    /* Configuration Base I/O Address */
#define DE425_CFDA              0x2c    /* Configuration Driver Area */
#define DE425_ENETROM           0xc90   /* Offset in I/O space for ENETROM */
#define DE425_CFG0              0xc88   /* IRQ Configuration Register */

struct tulip_eisa_softc {
       struct tulip_softc sc_tulip;    /* real Tulip softc */

       /* EISA-specific goo. */
       void    *sc_ih;                 /* interrupt handle */
};

static int      tlp_eisa_match(device_t, cfdata_t, void *);
static void     tlp_eisa_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(tlp_eisa, sizeof(struct tulip_eisa_softc),
   tlp_eisa_match, tlp_eisa_attach, NULL, NULL);

static const int tlp_eisa_irqs[] = { 5, 9, 10, 11 };

struct tulip_eisa_product {
       const char      *name;  /* device name */
       tulip_chip_t    chip;   /* base Tulip chip type */
};

static const struct tulip_eisa_product dec4250 = {
       .name = "DEC DE425",
       .chip = TULIP_CHIP_DE425,
};

static const struct device_compatible_entry compat_data[] = {
       { .compat = "DEC4250",          .data = &dec4250 },
       DEVICE_COMPAT_EOL
};

static int
tlp_eisa_match(device_t parent, cfdata_t match,
   void *aux)
{
       struct eisa_attach_args *ea = aux;

       return (eisa_compatible_match(ea, compat_data));
}

static void
tlp_eisa_attach(device_t parent, device_t self, void *aux)
{
       static const u_int8_t testpat[] =
           { 0xff, 0, 0x55, 0xaa, 0xff, 0, 0x55, 0xaa };
       struct tulip_eisa_softc *esc = device_private(self);
       struct tulip_softc *sc = &esc->sc_tulip;
       struct eisa_attach_args *ea = aux;
       const struct device_compatible_entry *dce;
       eisa_chipset_tag_t ec = ea->ea_ec;
       eisa_intr_handle_t ih;
       bus_space_tag_t iot = ea->ea_iot;
       bus_space_handle_t ioh;
       const char *intrstr;
       const struct tulip_eisa_product *tep;
       u_int8_t enaddr[ETHER_ADDR_LEN], tmpbuf[sizeof(testpat)];
       u_int32_t val;
       int irq, ist, i, cnt;
       char intrbuf[EISA_INTRSTR_LEN];

       /*
        * Map the device.
        */
       if (bus_space_map(iot, EISA_SLOT_ADDR(ea->ea_slot),
           EISA_SLOT_SIZE, 0, &ioh)) {
               aprint_error(": unable to map I/O space\n");
               return;
       }

       sc->sc_dev = self;
       sc->sc_st = iot;
       sc->sc_sh = ioh;

       dce = eisa_compatible_lookup(ea, compat_data);
       KASSERT(dce != NULL);
       tep = dce->data;

       sc->sc_chip = tep->chip;

       /*
        * DE425's registers are 16 bytes long; the PCI configuration
        * space registers are interleaved in the I/O space.
        */
       sc->sc_regshift = 4;

       /*
        * No power management hooks.
        */
       sc->sc_flags |= TULIPF_ENABLED;

       /*
        * CBIO must map the EISA slot, and I/O access and Bus Mastering
        * must be enabled.
        */
       bus_space_write_4(iot, ioh, DE425_CBIO, EISA_SLOT_ADDR(ea->ea_slot));
       bus_space_write_4(iot, ioh, DE425_CFCS,
           bus_space_read_4(iot, ioh, DE425_CFCS) |
           PCI_COMMAND_IO_ENABLE | PCI_COMMAND_MASTER_ENABLE);

       /*
        * Get revision info.
        */
       sc->sc_rev = bus_space_read_4(iot, ioh, DE425_CFRV) & 0xff;

       aprint_normal(": %s Ethernet, pass %d.%d\n",
           tep->name, (sc->sc_rev >> 4) & 0xf, sc->sc_rev & 0xf);

       sc->sc_dmat = ea->ea_dmat;

       /*
        * EISA doesn't have a cache line register.
        */
       sc->sc_cacheline = 0;

       /*
        * Find the beginning of the Ethernet Address ROM.
        */
       for (i = 0, cnt = 0; i < sizeof(testpat) && cnt < 32; cnt++) {
               tmpbuf[i] = bus_space_read_1(iot, ioh, DE425_ENETROM);
               if (tmpbuf[i] == testpat[i])
                       i++;
               else
                       i = 0;
       }

       /*
        * ...and now read the contents of the Ethernet Address ROM.
        */
       sc->sc_srom_addrbits = 4;       /* 32 bytes */
       sc->sc_srom = kmem_alloc(TULIP_ROM_SIZE(4), KM_SLEEP);
       for (i = 0; i < TULIP_ROM_SIZE(4); i++)
               sc->sc_srom[i] = bus_space_read_1(iot, ioh, DE425_ENETROM);

       /*
        * None of the DE425 boards have the new-style SROMs.
        */
       if (tlp_parse_old_srom(sc, enaddr) == 0) {
               aprint_error_dev(self, "unable to decode old-style SROM\n");
               return;
       }

       /*
        * All DE425 boards use the 21040 media switch.
        */
       sc->sc_mediasw = &tlp_21040_mediasw;

       /*
        * Figure out which IRQ we want to use, and determine if it's
        * edge- or level-triggered.
        */
       val = bus_space_read_4(iot, ioh, DE425_CFG0);
       irq = tlp_eisa_irqs[(val >> 1) & 0x03];
       ist = (val & 0x01) ? IST_EDGE : IST_LEVEL;

       /*
        * Map and establish our interrupt.
        */
       if (eisa_intr_map(ec, irq, &ih)) {
               aprint_error_dev(self, "unable to map interrupt (%u)\n", irq);
               return;
       }
       intrstr = eisa_intr_string(ec, ih, intrbuf, sizeof(intrbuf));
       esc->sc_ih = eisa_intr_establish(ec, ih, ist, IPL_NET, tlp_intr, sc);
       if (esc->sc_ih == NULL) {
               aprint_error_dev(self, "unable to establish interrupt");
               if (intrstr != NULL)
                       aprint_error(" at %s", intrstr);
               aprint_error("\n");
               return;
       }
       if (intrstr != NULL) {
               aprint_normal_dev(self, "interrupting at %s (%s trigger)\n",
                   ist == IST_EDGE ? "edge" : "level", intrstr);
       }

       /*
        * Finish off the attach.
        */
       tlp_attach(sc, enaddr);
}

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