/*      $NetBSD: if_le_oioc.c,v 1.6 2022/02/12 03:24:34 riastradh Exp $ */

/*
* Copyright (c) 2009 Stephen M. Rumble
* 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. The name of the author 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_le_oioc.c,v 1.6 2022/02/12 03:24:34 riastradh 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 <uvm/uvm.h>    // for uvm_pglistalloc

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

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

#include <machine/cpu.h>
#include <machine/machtype.h>

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

#include <dev/arcbios/arcbios.h>
#include <dev/arcbios/arcbiosvar.h>

#include <sgimips/ioc/oiocvar.h>
#include <sgimips/ioc/oiocreg.h>

#include <mips/include/cache.h>

#ifndef OIOC_LANCE_NPAGES
#define OIOC_LANCE_NPAGES       64      /* 256KB */
#endif

#if OIOC_LANCE_NPAGES > OIOC_ENET_NPGMAPS
#error OIOC_LANCE_NPAGES > OIOC_ENET_NPGMAPS (512)
#endif

/*
* Ethernet software status per interface.
* The real stuff is in dev/ic/am7990var.h
* The really real stuff is in dev/ic/lancevar.h
*
* Lance is somewhat nasty MI code. We basically get:
*      struct le_softc {
*              struct am7990_softc {
*                      struct lance_softc {
*                              device_t sc_dev;
*                              ...
*                      }
*              }
*
*              bus_space_tag ...
*      }
*
* So, we can cast any three to any other three, plus
* device_private(sc_dev) points back at the top (i.e. to le_softc,
* am7990_softc and lance_softc). Bloody hell!
*/
struct le_softc {
       struct  am7990_softc sc_am7990;         /* glue to MI code */

       bus_space_tag_t      sc_st;
       bus_space_handle_t   sc_maph;           /* ioc<->lance page map regs */
       bus_space_handle_t   sc_rdph;           /* lance rdp */
       bus_space_handle_t   sc_raph;           /* lance rap */
};

static int      le_match(device_t, cfdata_t, void *);
static void     le_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(le, sizeof(struct le_softc),
   le_match, le_attach, 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_write_2(lesc->sc_st, lesc->sc_raph, 0, port);
       bus_space_write_2(lesc->sc_st, lesc->sc_rdph, 0, val);
}

static uint16_t
lerdcsr(struct lance_softc *sc, uint16_t port)
{
       struct le_softc *lesc = (struct le_softc *)sc;
       bus_space_write_2(lesc->sc_st, lesc->sc_raph, 0, port);
       return (bus_space_read_2(lesc->sc_st, lesc->sc_rdph, 0));
}

/*
* Always present on IP6 and IP10. IP4? Unknown.
*/
int
le_match(device_t parent, cfdata_t cf, void *aux)
{
       struct oioc_attach_args *oa = aux;

       if (mach_type == MACH_SGI_IP4)
               return (0);

       if (strcmp(oa->oa_name, cf->cf_name) == 0)
               return (1);

       return (0);
}

void
le_attach(device_t parent, device_t self, void *aux)
{
       struct le_softc *lesc = device_private(self);
       struct lance_softc *sc = &lesc->sc_am7990.lsc;
       struct oioc_attach_args *oa = aux;
       struct pglist mlist;
       const char *enaddrstr;
       char enaddr[ETHER_ADDR_LEN];
       char pbuf[9];
       int i, error;

       sc->sc_dev = self;
       lesc->sc_st = oa->oa_st;

       enaddrstr = arcbios_GetEnvironmentVariable("eaddr");
       if (enaddrstr == NULL) {
               aprint_error(": failed to obtain MAC address\n");
               return;
       }

       if ((error = bus_space_subregion(oa->oa_st, oa->oa_sh, OIOC_LANCE_RDP,
           OIOC_LANCE_RDP_SIZE, &lesc->sc_rdph)) != 0) {
               printf(": unable to map rdp reg, error=%d\n", error);
               goto fail_0;
       }

       if ((error = bus_space_subregion(oa->oa_st, oa->oa_sh, OIOC_LANCE_RAP,
           OIOC_LANCE_RAP_SIZE, &lesc->sc_raph)) != 0) {
               printf(": unable to map rap reg, error=%d\n", error);
               goto fail_1;
       }

       if ((error = bus_space_subregion(oa->oa_st, oa->oa_sh,
           OIOC_ENET_PGMAP_BASE, OIOC_ENET_PGMAP_SIZE, &lesc->sc_maph)) != 0) {
               printf(": unable to map rap reg, error=%d\n", error);
               goto fail_2;
       }

       /* Allocate a contiguous chunk of physical memory for the le buffer. */
       error = uvm_pglistalloc(OIOC_LANCE_NPAGES * PAGE_SIZE,
           pmap_limits.avail_start, pmap_limits.avail_end, PAGE_SIZE, 0,
           &mlist, 1, 0);
       if (error) {
               aprint_error(": failed to allocate ioc<->lance buffer space, "
                   "error = %d\n", error);
               goto fail_3;
       }

       /* Use IOC to map the physical memory into the Ethernet chip's space. */
       for (i = 0; i < OIOC_LANCE_NPAGES; i++) {
               bus_space_write_2(lesc->sc_st,lesc->sc_maph,
                   OIOC_ENET_PGMAP_OFF(i),
                   (VM_PAGE_TO_PHYS(mlist.tqh_first) >> PAGE_SHIFT) + i);
       }

       sc->sc_mem = (void *)MIPS_PHYS_TO_KSEG1(
           (uint32_t)VM_PAGE_TO_PHYS(mlist.tqh_first));
       sc->sc_memsize = OIOC_LANCE_NPAGES * PAGE_SIZE;
       sc->sc_addr = 0;
       sc->sc_conf3 = LE_C3_BSWP;

       ether_aton_r(enaddr, sizeof(enaddr), enaddrstr);
       memcpy(sc->sc_enaddr, enaddr, sizeof(sc->sc_enaddr));

       if (cpu_intr_establish(oa->oa_irq, IPL_NET, am7990_intr, sc) == NULL) {
               aprint_error(": failed to establish interrupt %d\n",oa->oa_irq);
               goto fail_4;
       }

       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;
       sc->sc_hwinit = NULL;

       format_bytes(pbuf, sizeof(pbuf), OIOC_LANCE_NPAGES * PAGE_SIZE);
       aprint_normal(": main memory used = %s\n", pbuf);
       aprint_normal("%s", device_xname(self));

       am7990_config(&lesc->sc_am7990);

       return;

fail_4:
       uvm_pglistfree(&mlist);
fail_3:
       bus_space_unmap(oa->oa_st, oa->oa_sh, lesc->sc_maph);
fail_2:
       bus_space_unmap(oa->oa_st, oa->oa_sh, lesc->sc_raph);
fail_1:
       bus_space_unmap(oa->oa_st, oa->oa_sh, lesc->sc_rdph);
fail_0:
       return;
}

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