/*      $NetBSD: if_ie.c,v 1.14 2025/05/04 14:26:27 andvar 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.
*/

#include <sys/param.h>
#include <sys/types.h>
#include <sys/socket.h>

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

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

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

#define NTXBUF  1
#define NRXBUF  16
#define IE_RBUF_SIZE    ETHER_MAX_LEN

#include <machine/prom.h>

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

#include "i82586.h"
#include "if_iereg.h"

int     ie_debug = 0;

void ie_stop(struct netif *);
void ie_end(struct netif *);
void ie_error(struct netif *, char *, volatile struct iereg *);
int ie_get(struct iodesc *, void *, size_t, saseconds_t);
void ie_init(struct iodesc *, void *);
int ie_match(struct netif *, void *);
int ie_poll(struct iodesc *, void *, int);
int ie_probe(struct netif *, void *);
int ie_put(struct iodesc *, void *, size_t);
void ie_reset(struct netif *, u_char *);
void ieack(volatile struct iereg *, struct iemem *);

struct netif_stats ie_stats;

struct netif_dif ie0_dif = {
       0,                      /* unit */
       1,                      /* nsel */
       &ie_stats,
       0,
       0,
};

struct netif_driver ie_driver = {
       "ie",                   /* netif_bname */
       ie_match,               /* match */
       ie_probe,               /* probe */
       ie_init,                /* init */
       ie_get,                 /* get */
       ie_put,                 /* put */
       ie_end,                 /* end */
       &ie0_dif,               /* netif_ifs */
       1,                      /* netif_nifs */
};

struct ie_configuration {
       u_int   phys_addr;
       int     used;
} ie_config[] = {
       { INTEL_REG_ADDR, 0 }
};

int     nie_config = __arraycount(ie_config);

struct {
       struct iereg *sc_reg;   /* IE registers */
       struct iemem *sc_mem;   /* RAM */
}       ie_softc;

int
ie_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(ie_driver.netif_bname, name, 2))
               val += 10;
       for (i = 0; i < nie_config; i++) {
               if (ie_config[i].used)
                       continue;
               if (ie_debug)
                       printf("ie%d: ie_match --> %d\n", i, val + 1);
               ie_config[i].used++;
               return (val + 1);
       }
       if (ie_debug)
               printf("ie%d: ie_match --> 0\n", i);
       return 0;
}

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

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

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

void
ie_error(struct netif *nif, char *str, volatile struct iereg *ier)
{

       panic("ie%d: unknown error", nif->nif_unit);
}

void
ieack(volatile struct iereg *ier, struct iemem *iem)
{

       /* ack the `interrupt' */
       iem->im_scb.ie_command = iem->im_scb.ie_status & IE_ST_WHENCE;
       ier->ie_attention = 1;  /* chan attention! */
       while (iem->im_scb.ie_command)
               ;
}

void
ie_reset(struct netif *nif, u_char *myea)
{
       volatile struct iereg *ier = ie_softc.sc_reg;
       struct iemem *iem = ie_softc.sc_mem;
       int     timo = 10000, i;
       volatile int t;
       u_int   a;

       if (ie_debug)
               printf("ie%d: ie_reset called\n", nif->nif_unit);

       /*printf("ier %x iem %x\n", ier, iem);*/

       *(u_char *)0xfff4202a = 0x40;

       memset(iem, 0, sizeof(*iem));
       iem->im_scp.scp_sysbus = 0;
       iem->im_scp.scp_iscp_low = (int)&iem->im_iscp & 0xffff;
       iem->im_scp.scp_iscp_high = (int)&iem->im_iscp >> 16;

       iem->im_iscp.iscp_scboffset = (int)&iem->im_scb - (int) iem;
       iem->im_iscp.iscp_busy = 1;
       iem->im_iscp.iscp_base_low = (int)iem & 0xffff;
       iem->im_iscp.iscp_base_high = (int)iem >> 16;

       /*
        * completely and utterly unlike what i expected, the
        * "write" order is:
        * 1st: d15-d0 -> high address
        * 2nd: d31-d16 -> low address
        */

       /* reset chip */
       a = IE_PORT_RESET;
       ier->ie_porthigh = a & 0xffff;
       t = 0;
       t = 1;
       ier->ie_portlow = a >> 16;
       for (t = timo; t--;)
               ;

       /* set new SCP pointer */
       a = (int) &iem->im_scp | IE_PORT_NEWSCP;
       ier->ie_porthigh = a & 0xffff;
       t = 0;
       t = 1;
       ier->ie_portlow = a >> 16;
       for (t = timo; t--;)
               ;

       ier->ie_attention = 1;  /* chan attention! */
       for (t = timo * 10; t--;)
               ;

       /* send CONFIGURE command */
       iem->im_scb.ie_command = IE_CU_START;
       iem->im_scb.ie_command_list = (int) &iem->im_cc - (int) iem;
       iem->im_cc.com.ie_cmd_status = 0;
       iem->im_cc.com.ie_cmd_cmd = IE_CMD_CONFIG | IE_CMD_LAST;
       iem->im_cc.com.ie_cmd_link = 0xffff;
       iem->im_cc.ie_config_count = 0x0c;
       iem->im_cc.ie_fifo = 8;
       iem->im_cc.ie_save_bad = 0x40;
       iem->im_cc.ie_addr_len = 0x2e;
       iem->im_cc.ie_priority = 0;
       iem->im_cc.ie_ifs = 0x60;
       iem->im_cc.ie_slot_low = 0;
       iem->im_cc.ie_slot_high = 0xf2;
       iem->im_cc.ie_promisc = 0;
       iem->im_cc.ie_crs_cdt = 0;
       iem->im_cc.ie_min_len = 64;
       iem->im_cc.ie_junk = 0xff;

       ier->ie_attention = 1;  /* chan attention! */
       for (t = timo * 10; t--;)
               ;

       ieack(ier, iem);

       /*printf("ic %x\n", &iem->im_ic);*/
       /* send IASETUP command */
       iem->im_scb.ie_command = IE_CU_START;
       iem->im_scb.ie_command_list = (int)&iem->im_ic - (int)iem;
       iem->im_ic.com.ie_cmd_status = 0;
       iem->im_ic.com.ie_cmd_cmd = IE_CMD_IASETUP | IE_CMD_LAST;
       iem->im_ic.com.ie_cmd_link = 0xffff;
       memcpy((void *)&iem->im_ic.ie_address, myea,
           sizeof(iem->im_ic.ie_address));

       ier->ie_attention = 1;  /* chan attention! */
       for (t = timo * 10; t--;)
               ;

       ieack(ier, iem);

       /* setup buffers */

       for (i = 0; i < NRXBUF; i++) {
               iem->im_rfd[i].ie_fd_next = (int)&iem->im_rfd[(i+1) % NRXBUF] -
                   (int)iem;
               iem->im_rbd[i].ie_rbd_next = (int)&iem->im_rbd[(i+1) % NRXBUF] -
                   (int)iem;
               a = (int)&iem->im_rxbuf[i * IE_RBUF_SIZE];
               iem->im_rbd[i].ie_rbd_buffer_low = a & 0xffff;
               iem->im_rbd[i].ie_rbd_buffer_high = a >> 16;
               iem->im_rbd[i].ie_rbd_length = IE_RBUF_SIZE;
       }
       iem->im_rfd[NRXBUF - 1].ie_fd_last |= IE_FD_LAST;
       iem->im_rbd[NRXBUF - 1].ie_rbd_length |= IE_RBD_LAST;
       iem->im_rfd[0].ie_fd_buf_desc = (int)&iem->im_rbd[0] - (int)iem;

#if 0
       printf("rfd[0] %x rbd[0] %x buf[0] %x\n", &iem->im_rfd, &iem->im_rbd,
           &iem->im_rxbuf);
#endif

       /* send receiver start command */
       iem->im_scb.ie_command = IE_RU_START;
       iem->im_scb.ie_command_list = 0;
       iem->im_scb.ie_recv_list = (int) &iem->im_rfd[0] - (int) iem;
       ier->ie_attention = 1;  /* chan attention! */
       while (iem->im_scb.ie_command)
               ;

       ieack(ier, iem);
}

int
ie_poll(struct iodesc *desc, void *pkt, int len)
{
       volatile struct iereg *ier = ie_softc.sc_reg;
       struct iemem *iem = ie_softc.sc_mem;
       static int slot;
       int length = 0;
       u_short status;

       __asm(".word    0xf518\n");
       status = iem->im_rfd[slot].ie_fd_status;
       if (status & IE_FD_BUSY)
               return 0;

       /* printf("slot %d: %x\n", slot, status); */
       if ((status & (IE_FD_COMPLETE | IE_FD_OK)) ==
           (IE_FD_COMPLETE | IE_FD_OK)) {
               length = iem->im_rbd[slot].ie_rbd_actual & 0x3fff;
               if (length > len)
                       length = len;
               memcpy(pkt, (void *)&iem->im_rxbuf[slot * IE_RBUF_SIZE],
                   length);

               iem->im_rfd[slot].ie_fd_status = 0;
               iem->im_rfd[slot].ie_fd_last |= IE_FD_LAST;
               iem->im_rfd[(slot+NRXBUF-1)%NRXBUF].ie_fd_last &=
                   ~IE_FD_LAST;
               iem->im_rbd[slot].ie_rbd_actual = 0;
               iem->im_rbd[slot].ie_rbd_length |= IE_RBD_LAST;
               iem->im_rbd[(slot+NRXBUF-1)%NRXBUF].ie_rbd_length &=
                   ~IE_RBD_LAST;
#if 0
               printf("S%d\n", slot);
#endif
               slot++;
               /* should move descriptor onto end of queue... */
       }
       if ((iem->im_scb.ie_status & IE_RU_READY) == 0) {
               printf("RR\n");

               for (slot = 0; slot < NRXBUF; slot++) {
                       iem->im_rbd[slot].ie_rbd_length &= ~IE_RBD_LAST;
                       iem->im_rfd[slot].ie_fd_last &= ~IE_FD_LAST;
               }
               iem->im_rbd[NRXBUF-1].ie_rbd_length |= IE_RBD_LAST;
               iem->im_rfd[NRXBUF-1].ie_fd_last |= IE_FD_LAST;

               iem->im_rfd[0].ie_fd_buf_desc = (int)&iem->im_rbd[0] - (int)iem;

               iem->im_scb.ie_command = IE_RU_START;
               iem->im_scb.ie_command_list = 0;
               iem->im_scb.ie_recv_list = (int)&iem->im_rfd[0] - (int)iem;
               ier->ie_attention = 1;  /* chan attention! */
               while (iem->im_scb.ie_command)
                       ;
               slot = 0;
       }
       slot = slot % NRXBUF;
       return length;
}

int
ie_put(struct iodesc *desc, void *pkt, size_t len)
{
       volatile struct iereg *ier = ie_softc.sc_reg;
       struct iemem *iem = ie_softc.sc_mem;
       u_char *p = pkt;
       u_int a;
       int xx = 0;

       /* send transmit command */

       while (iem->im_scb.ie_command)
               ;

       /* copy data */
       memcpy((void *)&iem->im_txbuf[xx], p, len);

       len = MAX(len, ETHER_MIN_LEN);

       /* build transmit descriptor */
       iem->im_xd[xx].ie_xmit_flags = len | IE_XMIT_LAST;
       iem->im_xd[xx].ie_xmit_next = 0xffff;
       a = (int) &iem->im_txbuf[xx];
       iem->im_xd[xx].ie_xmit_buf_low = a & 0xffff;
       iem->im_xd[xx].ie_xmit_buf_high = a >> 16;

       /* transmit command */
       iem->im_xc[xx].com.ie_cmd_status = 0;
       iem->im_xc[xx].com.ie_cmd_cmd = IE_CMD_XMIT | IE_CMD_LAST;
       iem->im_xc[xx].com.ie_cmd_link = 0xffff;
       iem->im_xc[xx].ie_xmit_desc = (int)&iem->im_xd[xx] - (int)iem;
       iem->im_xc[xx].ie_xmit_length = len;
       memcpy((void *)&iem->im_xc[xx].ie_xmit_addr, p,
           sizeof iem->im_xc[xx].ie_xmit_addr);

       iem->im_scb.ie_command = IE_CU_START;
       iem->im_scb.ie_command_list = (int)&iem->im_xc[xx] - (int)iem;

       ier->ie_attention = 1;  /* chan attention! */

       if (ie_debug) {
               printf("ie%d: send %d to %x:%x:%x:%x:%x:%x\n",
                   ((struct netif *)desc->io_netif)->nif_unit, len,
                   p[0], p[1], p[2], p[3], p[4], p[5]);
       }
       return len;
}

int
ie_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 = ie_poll(desc, pkt, len);
       }
       return cc;
}
/*
* init ie device.   return 0 on failure, 1 if ok.
*/
void
ie_init(struct iodesc *desc, void *machdep_hint)
{
       struct netif *nif = desc->io_netif;

       if (ie_debug)
               printf("ie%d: ie_init called\n", nif->nif_unit);
       machdep_common_ether(desc->myea);
       memset(&ie_softc, 0, sizeof(ie_softc));
       ie_softc.sc_reg =
           (struct iereg *)ie_config[nif->nif_unit].phys_addr;
       ie_softc.sc_mem = (struct iemem *)0x3e0000;
       ie_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
ie_stop(struct netif *nif)
{
       volatile struct iereg *ier = ie_softc.sc_reg;
       struct iemem *iem = ie_softc.sc_mem;
       int timo = 10000;
       volatile int t;
       u_int a;

       iem->im_iscp.iscp_busy = 1;
       /* reset chip */
       a = IE_PORT_RESET;
       ier->ie_porthigh = a & 0xffff;
       t = 0;
       t = 1;
       ier->ie_portlow = a >> 16;
       for (t = timo; t--;)
               ;

       /* reset chip again */
       a = IE_PORT_RESET;
       ier->ie_porthigh = a & 0xffff;
       t = 0;
       t = 1;
       ier->ie_portlow = a >> 16;
       for (t = timo; t--;)
               ;

#if 0
       printf("status %x busy %x\n", iem->im_scb.ie_status,
           iem->im_iscp.iscp_busy);
#endif
}

void
ie_end(struct netif *nif)
{

       if (ie_debug)
               printf("ie%d: ie_end called\n", nif->nif_unit);

       ie_stop(nif);

#if 0
       *(u_char *)0xfff42002 = 0;
#endif
}

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