/*      $NetBSD: le_poll.c,v 1.6 2018/03/08 03:12:02 mrg Exp $  */

/*
* 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 "sboot.h"
#include "if_lereg.h"

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

static void le_error(const char *, struct lereg1 *);
static void le_reset(u_char *);
static int le_poll(void *, int);

static void
le_error(const char *str, struct lereg1 *ler1)
{

       /* ler1->ler1_rap = LE_CSRO done in caller */
       if (ler1->ler1_rdp & LE_C0_BABL) {
               printf("le0: been babbling, found by '%s'\n", str);
               callrom();
       }
       if (ler1->ler1_rdp & LE_C0_CERR) {
               ler1->ler1_rdp = LE_C0_CERR;
       }
       if (ler1->ler1_rdp & LE_C0_MISS) {
               ler1->ler1_rdp = LE_C0_MISS;
       }
       if (ler1->ler1_rdp & LE_C0_MERR) {
               printf("le0: memory error in '%s'\n", str);
               callrom();
       }
}

static void
le_reset(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;

       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("le0: init timeout, stat = 0x%x\n", 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;
}

static int
le_poll(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("le_poll", ler1);
       if (rmd->rmd1_bits & LE_R1_ERR) {
               printf("le0_poll: rmd status 0x%x\n", rmd->rmd1_bits);
               length = 0;
               goto cleanup;
       }
       if ((rmd->rmd1_bits & (LE_R1_STP|LE_R1_ENP)) != (LE_R1_STP|LE_R1_ENP)) {
               printf("le_poll: chained packet\n");
               callrom();
       }

       length = rmd->rmd3;
       if (length >= LEMTU) {
               length = 0;
               printf("csr0 when bad things happen: %x\n", ler1->ler1_rdp);
               callrom();
               goto cleanup;
       }
       if (length == 0)
               goto cleanup;
       length -= 4;
       if (length > 0)
               memcpy(pkt, (char *)&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(u_char *pkt, size_t len)
{
       struct lereg1 *ler1 = le_softc.sc_r1;
       struct lereg2 *ler2 = le_softc.sc_r2;
       struct letmd *tmd;
       int timo = 100000, stat = 0;
       unsigned int a;

       ler1->ler1_rap = LE_CSR0;
       if (ler1->ler1_rdp & LE_C0_ERR)
               le_error("le_put(way before xmit)", ler1);
       tmd = &ler2->ler2_tmd[le_softc.next_tmd];
       while (tmd->tmd1_bits & LE_T1_OWN) {
               printf("le0: output buffer busy\n");
       }
       memcpy((char *)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("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("le_put(after xmit)", ler1);
       do {
               if (--timo == 0) {
                       printf("le0: transmit timeout, stat = 0x%x\n",
                           stat);
                       if (ler1->ler1_rdp & LE_C0_ERR)
                               le_error("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("le_put(xmit error)", ler1);
               }
               le_softc.next_tmd = 0;
#if 0
               (le_softc.next_tmd == (LETBUF - 1)) ? 0 : le_softc.next_tmd + 1;
#endif
               if (tmd->tmd1_bits & LE_T1_ERR)
                       printf("le0: transmit error, error = 0x%x\n",
                           tmd->tmd3);
               return -1;
       }
       return len;
}

int le_get(u_char *pkt, size_t len, u_long timeout)
{
       int cc;
       int now, then;
       int stopat = time() + timeout;
       then = 0;

       cc = 0;
       while ((now = time()) < stopat && !cc) {
               cc = le_poll(pkt, len);
               if (then != now) {
#ifdef LE_DEBUG
                       printf("%d  \r", stopat - now);
#endif
                       then = now;
               }
               if (cc && (pkt[0] != myea[0] || pkt[1] != myea[1] ||
                   pkt[2] != myea[2] || pkt[3] != myea[3] ||
                   pkt[4] != myea[4] || pkt[5] != myea[5])) {
                       cc = 0; /* ignore broadcast / multicast */
#ifdef LE_DEBUG
                       printf("reject (%d sec left)\n", stopat - now);
#endif
               }
       }
#ifdef LE_DEBUG
       printf("\n");
#endif
       return cc;
}

void le_init(void)
{
       int *ea = (int *)LANCE_ADDR;
       u_long *eram = (u_long *)ERAM_ADDR;
       u_long e = *ea;

       if ((e & 0x2fffff00) == 0x2fffff00) {
               printf("ERROR: ethernet address not set!  Use LSAD.\n");
               callrom();
       }
       myea[0] = 0x08;
       myea[1] = 0x00;
       myea[2] = 0x3e;
       e = e >> 8;
       myea[5] = e & 0xff;
       e = e >> 8;
       myea[4] = e & 0xff;
       e = e >> 8;
       myea[3] = e;
       printf("le0: ethernet address: %x:%x:%x:%x:%x:%x\n",
           myea[0], myea[1], myea[2], myea[3], myea[4], myea[5]);
       memset(&le_softc, 0, sizeof(le_softc));
       le_softc.sc_r1 = (struct lereg1 *)LANCE_REG_ADDR;
       le_softc.sc_r2 = (struct lereg2 *)(*eram - (1024*1024));
       le_reset(myea);
}

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

       ler1->ler1_rap = LE_CSR0;
       ler1->ler1_rdp = LE_C0_STOP;
}

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