/*      $NetBSD: if_le.c,v 1.10 2009/01/12 11:32:44 tsutsui Exp $       */

/*
* Copyright (c) 1995 Theo de Raadt
*
* 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.
*
* Copyright (c) 1993 Adam Glass
* 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 Adam Glass.
* 4. 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 Adam Glass ``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 REGENTS 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/param.h>
#include <sys/types.h>

#include <netinet/in.h>
#include <netinet/in_systm.h>

#include <machine/prom.h>

#include <lib/libkern/libkern.h>
#include <lib/libsa/stand.h>
#include <lib/libsa/net.h>

#include "libsa.h"
#include "netif.h"
#include "config.h"
#include "dev_net.h"

#include "if_lereg.h"

int     le_debug = 0;

void le_end(struct netif *);
void le_error(struct netif *, char *, volatile struct lereg1 *);
int le_get(struct iodesc *, void *, size_t, saseconds_t);
void le_init(struct iodesc *, void *);
int le_match(struct netif *, void *);
int le_poll(struct iodesc *, void *, int);
int le_probe(struct netif *, void *);
int le_put(struct iodesc *, void *, size_t);
void le_reset(struct netif *, u_char *);

struct netif_stats le_stats;

struct netif_dif le0_dif = {
       0,                      /* unit */
       1,                      /* nsel */
       &le_stats,
       0,
       0,
};

struct netif_driver le_driver = {
       "le",                   /* netif_bname */
       le_match,               /* match */
       le_probe,               /* probe */
       le_init,                /* init */
       le_get,                 /* get */
       le_put,                 /* put */
       le_end,                 /* end */
       &le0_dif,               /* netif_ifs */
       1,                      /* netif_nifs */
};

struct le_configuration {
       unsigned int phys_addr;
       int     used;
} le_config[] = {
       { LANCE_REG_ADDR, 0 }
};

int     nle_config = __arraycount(le_config);

struct {
       struct lereg1 *sc_r1;   /* LANCE registers */
       struct lereg2 *sc_r2;   /* RAM */
       int     next_rmd;
       int     next_tmd;
}       le_softc;

int
le_match(struct netif *nif, void *machdep_hint)
{
       char   *name;
       int     i, val = 0;

       if (bugargs.cputyp != CPU_147)
               return 0;
       name = machdep_hint;
       if (name && !memcmp(le_driver.netif_bname, name, 2))
               val += 10;
       for (i = 0; i < nle_config; i++) {
               if (le_config[i].used)
                       continue;
               if (le_debug)
                       printf("le%d: le_match --> %d\n", i, val + 1);
               le_config[i].used++;
               return val + 1;
       }
       if (le_debug)
               printf("le%d: le_match --> 0\n", i);
       return 0;
}

int
le_probe(struct netif *nif, void *machdep_hint)
{

       /* the set unit is the current unit */
       if (le_debug)
               printf("le%d: le_probe called\n", nif->nif_unit);

       if (bugargs.cputyp == CPU_147)
               return 0;
       return 1;
}

void
le_error(struct netif *nif, char *str, volatile struct lereg1 *ler1)
{

       /* ler1->ler1_rap = LE_CSRO done in caller */
       if (ler1->ler1_rdp & LE_C0_BABL)
               panic("le%d: been babbling, found by '%s'", nif->nif_unit, str);
       if (ler1->ler1_rdp & LE_C0_CERR) {
               le_stats.collision_error++;
               ler1->ler1_rdp = LE_C0_CERR;
       }
       if (ler1->ler1_rdp & LE_C0_MISS) {
               le_stats.missed++;
               ler1->ler1_rdp = LE_C0_MISS;
       }
       if (ler1->ler1_rdp & LE_C0_MERR) {
               printf("le%d: memory error in '%s'\n", nif->nif_unit, str);
               panic("memory error");
       }
}

void
le_reset(struct netif *nif, u_char *myea)
{
       struct lereg1 *ler1 = le_softc.sc_r1;
       struct lereg2 *ler2 = le_softc.sc_r2;
       unsigned int a;
       int     timo = 100000, stat = 0, i;

       if (le_debug)
               printf("le%d: le_reset called\n", nif->nif_unit);
       ler1->ler1_rap = LE_CSR0;
       ler1->ler1_rdp = LE_C0_STOP;    /* do nothing until we are finished */

       memset(ler2, 0, sizeof(*ler2));

       ler2->ler2_mode = LE_MODE_NORMAL;
       ler2->ler2_padr[0] = myea[1];
       ler2->ler2_padr[1] = myea[0];
       ler2->ler2_padr[2] = myea[3];
       ler2->ler2_padr[3] = myea[2];
       ler2->ler2_padr[4] = myea[5];
       ler2->ler2_padr[5] = myea[4];


       ler2->ler2_ladrf0 = 0;
       ler2->ler2_ladrf1 = 0;

       a = (u_int)ler2->ler2_rmd;
       ler2->ler2_rlen = LE_RLEN | (a >> 16);
       ler2->ler2_rdra = a & LE_ADDR_LOW_MASK;

       a = (u_int)ler2->ler2_tmd;
       ler2->ler2_tlen = LE_TLEN | (a >> 16);
       ler2->ler2_tdra = a & LE_ADDR_LOW_MASK;

       ler1->ler1_rap = LE_CSR1;
       a = (u_int)ler2;
       ler1->ler1_rdp = a & LE_ADDR_LOW_MASK;
       ler1->ler1_rap = LE_CSR2;
       ler1->ler1_rdp = a >> 16;

       for (i = 0; i < LERBUF; i++) {
               a = (u_int)&ler2->ler2_rbuf[i];
               ler2->ler2_rmd[i].rmd0 = a & LE_ADDR_LOW_MASK;
               ler2->ler2_rmd[i].rmd1_bits = LE_R1_OWN;
               ler2->ler2_rmd[i].rmd1_hadr = a >> 16;
               ler2->ler2_rmd[i].rmd2 = -LEMTU;
               ler2->ler2_rmd[i].rmd3 = 0;
       }
       for (i = 0; i < LETBUF; i++) {
               a = (u_int)&ler2->ler2_tbuf[i];
               ler2->ler2_tmd[i].tmd0 = a & LE_ADDR_LOW_MASK;
               ler2->ler2_tmd[i].tmd1_bits = 0;
               ler2->ler2_tmd[i].tmd1_hadr = a >> 16;
               ler2->ler2_tmd[i].tmd2 = 0;
               ler2->ler2_tmd[i].tmd3 = 0;
       }

       ler1->ler1_rap = LE_CSR3;
       ler1->ler1_rdp = LE_C3_BSWP;

       ler1->ler1_rap = LE_CSR0;
       ler1->ler1_rdp = LE_C0_INIT;
       do {
               if (--timo == 0) {
                       printf("le%d: init timeout, stat = 0x%x\n",
                           nif->nif_unit, stat);
                       break;
               }
               stat = ler1->ler1_rdp;
       } while ((stat & LE_C0_IDON) == 0);

       ler1->ler1_rdp = LE_C0_IDON;
       le_softc.next_rmd = 0;
       le_softc.next_tmd = 0;
       ler1->ler1_rap = LE_CSR0;
       ler1->ler1_rdp = LE_C0_STRT;
}

int
le_poll(struct iodesc *desc, void  *pkt, int len)
{
       struct lereg1 *ler1 = le_softc.sc_r1;
       struct lereg2 *ler2 = le_softc.sc_r2;
       unsigned int a;
       int     length;
       struct lermd *rmd;


       ler1->ler1_rap = LE_CSR0;
       if ((ler1->ler1_rdp & LE_C0_RINT) != 0)
               ler1->ler1_rdp = LE_C0_RINT;
       rmd = &ler2->ler2_rmd[le_softc.next_rmd];
       if (rmd->rmd1_bits & LE_R1_OWN) {
               return 0;
       }
       if (ler1->ler1_rdp & LE_C0_ERR)
               le_error(desc->io_netif, "le_poll", ler1);
       if (rmd->rmd1_bits & LE_R1_ERR) {
               printf("le%d_poll: rmd status 0x%x\n",
                   ((struct netif *)desc->io_netif)->nif_unit,
                   rmd->rmd1_bits);
               length = 0;
               goto cleanup;
       }
       if ((rmd->rmd1_bits & (LE_R1_STP | LE_R1_ENP)) !=
           (LE_R1_STP | LE_R1_ENP))
               panic("le_poll: chained packet");

       length = rmd->rmd3;
       if (length >= LEMTU) {
               length = 0;
               panic("csr0 when bad things happen: %x", ler1->ler1_rdp);
               goto cleanup;
       }
       if (length == 0)
               goto cleanup;
       length -= 4;
       if (length > 0) {

               /*
                * if buffer is smaller than the packet truncate it.
                * (is this wise?)
                */
               if (length > len)
                       length = len;

               memcpy(pkt, (void *)&ler2->ler2_rbuf[le_softc.next_rmd],
                   length);
       }
cleanup:
       a = (u_int)&ler2->ler2_rbuf[le_softc.next_rmd];
       rmd->rmd0 = a & LE_ADDR_LOW_MASK;
       rmd->rmd1_hadr = a >> 16;
       rmd->rmd2 = -LEMTU;
       le_softc.next_rmd =
           (le_softc.next_rmd == (LERBUF - 1)) ? 0 : (le_softc.next_rmd + 1);
       rmd->rmd1_bits = LE_R1_OWN;
       return length;
}

int
le_put(struct iodesc *desc, void *pkt, size_t len)
{
       volatile struct lereg1 *ler1 = le_softc.sc_r1;
       volatile struct lereg2 *ler2 = le_softc.sc_r2;
       volatile struct letmd *tmd;
       int     timo = 100000, stat = 0;
       unsigned int a;
       int nifunit = ((struct netif *)desc->io_netif)->nif_unit;

       ler1->ler1_rap = LE_CSR0;
       if (ler1->ler1_rdp & LE_C0_ERR)
               le_error(desc->io_netif, "le_put(way before xmit)", ler1);
       tmd = &ler2->ler2_tmd[le_softc.next_tmd];
       while (tmd->tmd1_bits & LE_T1_OWN) {
               printf("le%d: output buffer busy\n", nifunit);
       }
       memcpy((void *)ler2->ler2_tbuf[le_softc.next_tmd], pkt, len);
       if (len < 64)
               tmd->tmd2 = -64;
       else
               tmd->tmd2 = -len;
       tmd->tmd3 = 0;
       if (ler1->ler1_rdp & LE_C0_ERR)
               le_error(desc->io_netif, "le_put(before xmit)", ler1);
       tmd->tmd1_bits = LE_T1_STP | LE_T1_ENP | LE_T1_OWN;
       a = (u_int)&ler2->ler2_tbuf[le_softc.next_tmd];
       tmd->tmd0 = a & LE_ADDR_LOW_MASK;
       tmd->tmd1_hadr = a >> 16;
       ler1->ler1_rdp = LE_C0_TDMD;
       if (ler1->ler1_rdp & LE_C0_ERR)
               le_error(desc->io_netif, "le_put(after xmit)", ler1);
       do {
               if (--timo == 0) {
                       printf("le%d: transmit timeout, stat = 0x%x\n",
                           nifunit, stat);
                       if (ler1->ler1_rdp & LE_C0_ERR)
                               le_error(desc->io_netif, "le_put(timeout)",
                                   ler1);
                       break;
               }
               stat = ler1->ler1_rdp;
       } while ((stat & LE_C0_TINT) == 0);
       ler1->ler1_rdp = LE_C0_TINT;
       if (ler1->ler1_rdp & LE_C0_ERR) {
               if ((ler1->ler1_rdp & (LE_C0_BABL | LE_C0_CERR | LE_C0_MISS |
                   LE_C0_MERR)) !=
                   LE_C0_CERR)
                       printf("le_put: xmit error, buf %d\n",
                           le_softc.next_tmd);
               le_error(desc->io_netif, "le_put(xmit error)", ler1);
       }
       le_softc.next_tmd = 0;
/*      (le_softc.next_tmd == (LETBUF - 1)) ? 0 : le_softc.next_tmd + 1;*/
       if (tmd->tmd1_bits & LE_T1_DEF)
               le_stats.deferred++;
       if (tmd->tmd1_bits & LE_T1_ONE)
               le_stats.collisions++;
       if (tmd->tmd1_bits & LE_T1_MORE)
               le_stats.collisions += 2;
       if (tmd->tmd1_bits & LE_T1_ERR) {
               printf("le%d: transmit error, error = 0x%x\n", nifunit,
                   tmd->tmd3);
               return -1;
       }
       if (le_debug) {
               printf("le%d: le_put() successful: sent %d\n",
                   nifunit, len);
               printf("le%d: le_put(): tmd1_bits: %x tmd3: %x\n",
                   nifunit,
                   (unsigned int)tmd->tmd1_bits,
                   (unsigned int)tmd->tmd3);
       }
       return len;
}

int
le_get(struct iodesc *desc, void *pkt, size_t len, saseconds_t timeout)
{
       satime_t  t;
       int     cc;

       t = getsecs();
       cc = 0;
       while (((getsecs() - t) < timeout) && !cc) {
               cc = le_poll(desc, pkt, len);
       }
       return cc;
}
/*
* init le device.   return 0 on failure, 1 if ok.
*/
void
le_init(struct iodesc *desc, void *machdep_hint)
{
       u_long eram = 4 * 1024 * 1024;
       struct netif *nif = desc->io_netif;

       if (le_debug)
               printf("le%d: le_init called\n", nif->nif_unit);
       machdep_common_ether(desc->myea);
       memset(&le_softc, 0, sizeof(le_softc));
       le_softc.sc_r1 =
           (struct lereg1 *)le_config[nif->nif_unit].phys_addr;
       le_softc.sc_r2 = (struct lereg2 *)(eram - (1024 * 1024));
       le_reset(desc->io_netif, desc->myea);
       printf("device: %s%d attached to %s\n", nif->nif_driver->netif_bname,
           nif->nif_unit, ether_sprintf(desc->myea));
}

void
le_end(struct netif *nif)
{
       struct lereg1 *ler1 = le_softc.sc_r1;

       if (le_debug)
               printf("le%d: le_end called\n", nif->nif_unit);
       ler1->ler1_rap = LE_CSR0;
       ler1->ler1_rdp = LE_C0_STOP;
}

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