/*      $NetBSD: zz9k_if.c,v 1.2 2024/02/05 21:46:05 andvar Exp $ */

/*
* Copyright (c) 2020 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Alain Runa.
*
* 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: zz9k_if.c,v 1.2 2024/02/05 21:46:05 andvar Exp $");

/* miscellaneous */
#include <sys/types.h>                  /* size_t */
#include <sys/stdint.h>                 /* uintXX_t */
#include <sys/stdbool.h>                /* bool */
#include <sys/syslog.h>                 /* log(), LOG_ERR */

/* driver(9) */
#include <sys/param.h>                  /* NODEV */
#include <sys/device.h>                 /* CFATTACH_DECL_NEW(), device_priv() */
#include <sys/errno.h>                  /* EINVAL, ENODEV, EPASSTHROUGH */

/* bus_space(9) and zorro bus */
#include <sys/bus.h>                    /* bus_space_xxx(), bus_space_xxx_t */
#include <sys/cpu.h>                    /* kvtop() */
#include <sys/systm.h>                  /* aprint_xxx(), memcpy() */
#include <amiga/dev/zbusvar.h>          /* zbus_args */

/* arp(9) and mbuf(9) */
#include <net/if.h>                     /* if_oerrors */
#include <net/if_ether.h>               /* ethercom, ifnet, ether_ifattach() */
#include <net/if_dl.h>                  /* satosdl(), sockaddr_dl, dl_addr */
#include <net/bpf.h>                    /* bpf_mtap(), BPF_D_OUT */
#include <netinet/if_inarp.h>           /* arp_ifinit() */
#include <sys/mbuf.h>                   /* mbuf_xxx */
#include <sys/sockio.h>                 /* SIOXXX */

/* Interrupt related */
#include <sys/intr.h>                   /* splvm(), splx() */
#include <amiga/amiga/isr.h>            /* isr */

/* zz9k related */
#include <amiga/dev/zz9kvar.h>          /* zz9kbus_attach_args */
#include <amiga/dev/zz9kreg.h>          /* ZZ9000 registers */
#include "zz9k_if.h"                    /* NZZ9K_IF */


/* The allmighty softc structure */
struct zzif_softc {
       device_t sc_dev;
       struct bus_space_tag sc_bst;
       bus_space_tag_t sc_iot;
       bus_space_handle_t sc_regh;
       bus_space_handle_t sc_rxh;
       bus_space_handle_t sc_txh;

       struct ethercom sc_ethercom;
       struct isr sc_isr;
       void* sc_txbuffer;
       void* sc_rxbuffer;
       uint16_t sc_sequence;
};

/* rx buffer contents */
struct zzif_frame {
       uint16_t size;
       uint16_t serial;
       struct ether_header header;
       uint8_t payload[ETHER_MAX_LEN - ETHER_HDR_LEN];
};


/* ifnet related callbacks */
static void zzif_init(struct zzif_softc *sc);
static void zzif_stop(struct zzif_softc *sc);
static void zzif_start(struct ifnet *ifp);
static int zzif_intr(void *arg);
static int zzif_ioctl(struct ifnet *ifp, u_long cmd, void *data);

/* driver(9) essentials */
static int zzif_match(device_t parent, cfdata_t match, void *aux);
static void zzif_attach(device_t parent, device_t self, void *aux);
CFATTACH_DECL_NEW(
   zz9k_if, sizeof(struct zzif_softc), zzif_match, zzif_attach, NULL, NULL);


/* Oh my God, it's full of stars! */

static int
zzif_match(device_t parent, cfdata_t match, void *aux)
{
       struct zz9kbus_attach_args *bap = aux;

       if (strcmp(bap->zzaa_name, "zz9k_if") != 0)
               return 0;

       return 1;
}

static void
zzif_attach(device_t parent, device_t self, void *aux)
{
       struct zz9kbus_attach_args *bap = aux;
       struct zzif_softc *sc = device_private(self);
       struct zz9k_softc *psc = device_private(parent);
       struct ifnet *ifp = &sc->sc_ethercom.ec_if;
       uint8_t lla[ETHER_ADDR_LEN];

       sc->sc_dev = self;
       sc->sc_bst.base = bap->zzaa_base;
       sc->sc_bst.absm = &amiga_bus_stride_1;
       sc->sc_iot = &sc->sc_bst;
       sc->sc_regh = psc->sc_regh;

       if (bus_space_map(sc->sc_iot, ZZ9K_RX_BASE, ZZ9K_RX_SIZE,
           BUS_SPACE_MAP_LINEAR, &sc->sc_rxh)) {
               aprint_error(": Failed to map MNT ZZ9000 eth rx buffer.\n");
               return;
       }

       if (bus_space_map(sc->sc_iot, ZZ9K_TX_BASE, ZZ9K_TX_SIZE,
           BUS_SPACE_MAP_LINEAR, &sc->sc_txh)) {
               aprint_error(": Failed to map MNT ZZ9000 eth tx buffer.\n");
               return;
       }

       /* get MAC from NIC */
       uint16_t macHI = ZZREG_R(ZZ9K_ETH_MAC_HI);
       uint16_t macMD = ZZREG_R(ZZ9K_ETH_MAC_MD);
       uint16_t macLO = ZZREG_R(ZZ9K_ETH_MAC_LO);
       lla[0] = macHI >> 8;
       lla[1] = macHI & 0xff;
       lla[2] = macMD >> 8;
       lla[3] = macMD & 0xff;
       lla[4] = macLO >> 8;
       lla[5] = macLO & 0xff;

#if 0
       aprint_normal(": Ethernet address %s  "
           "(10BASE-T, 100BASE-TX, AUTO)\n", ether_sprintf(lla));
#endif

       aprint_debug_dev(sc->sc_dev, "[DEBUG] registers at %p/%p (pa/va), "
           "rx buffer at %p/%p (pa/va), tx buffer at %p/%p (pa/va)\n",
           (void *)kvtop((void *)sc->sc_regh),
           bus_space_vaddr(sc->sc_iot, sc->sc_regh),
           (void *)kvtop((void *)sc->sc_rxh),
           bus_space_vaddr(sc->sc_iot, sc->sc_rxh),
           (void *)kvtop((void *)sc->sc_txh),
           bus_space_vaddr(sc->sc_iot, sc->sc_txh));

       /* set rx/tx buffers */
       sc->sc_txbuffer = bus_space_vaddr(sc->sc_iot, sc->sc_txh);
       sc->sc_rxbuffer = bus_space_vaddr(sc->sc_iot, sc->sc_rxh);

       /* configure the network interface */
       memcpy(ifp->if_xname, device_xname(sc->sc_dev), IFNAMSIZ);
       ifp->if_softc = sc;
       ifp->if_ioctl = zzif_ioctl;
       ifp->if_start = zzif_start;
       ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX;
       ifp->if_mtu   = ETHERMTU;

       /* attach the network interface. */
       if_attach(ifp);
       if_deferred_start_init(ifp, NULL);
       ether_ifattach(ifp, lla);

       aprint_normal(": Ethernet address %s\n", ether_sprintf(lla));

       /* setup the (receiving) interrupt service routine on int6 (default) */
       sc->sc_isr.isr_intr = zzif_intr;
       sc->sc_isr.isr_arg  = sc;
       sc->sc_isr.isr_ipl  = 6;
       add_isr(&sc->sc_isr);
}

static void
zzif_init(struct zzif_softc *sc)
{
       struct ifnet *ifp = &sc->sc_ethercom.ec_if;
       int s = splvm();

       ZZREG_W(ZZ9K_CONFIG, ZZREG_R(ZZ9K_CONFIG) | ZZ9K_CONFIG_INT_ETH);
       ifp->if_flags |= IFF_RUNNING;
       ifp->if_flags &= ~IFF_OACTIVE;
       if_schedule_deferred_start(ifp);
       splx(s);
}

static void
zzif_stop(struct zzif_softc *sc)
{
       struct ifnet *ifp = &sc->sc_ethercom.ec_if;
       int s = splvm();

       ZZREG_W(ZZ9K_CONFIG, ZZREG_R(ZZ9K_CONFIG) & ~ZZ9K_CONFIG_INT_ETH);
       ifp->if_flags &= ~IFF_RUNNING;
       splx(s);
}

static void
zzif_start(struct ifnet *ifp)
{
       struct zzif_softc *sc = ifp->if_softc;
       uint8_t *frame= (uint8_t *)sc->sc_txbuffer;
       struct mbuf *m;
       int size;

       if ((ifp->if_flags & IFF_RUNNING) == 0)
               return;

       ifp->if_flags |= IFF_OACTIVE;

       for (;;) {
               IF_DEQUEUE(&ifp->if_snd, m);
               if (m == NULL)
                       break;

               /* this should never happen, otherwise there's no help */
               if ((m->m_flags & M_PKTHDR) == 0)
                       panic("zzif_start: no packet header mbuf");

               size = m->m_pkthdr.len;
               if (size == 0)
                       panic("zzif_start: header mbuf with 0 len");

               if ((size < (ETHER_HDR_LEN)) ||
                   (size > (ETHER_MAX_LEN-ETHER_CRC_LEN))) {
                       aprint_error_dev(sc->sc_dev,
                           ": abnormal tx frame size of %i bytes\n", size);
                       m_freem(m);
                       break;
               }

               /* make bpf happy */
               bpf_mtap(ifp, m, BPF_D_OUT);

               /* copy dequeued mbuf data to transmit buffer of the ZZ9000 */
               for (struct mbuf *n = m; n != NULL; n = n->m_next) {
                       memcpy(frame, n->m_data, n->m_len);
                       frame += n->m_len;
               }

               m_freem(m);     /* we don't need it anymore */

               /* tell ZZ9000 to transmit packet with size and check result */
               ZZREG_W(ZZ9K_ETH_TX, size);
               size = ZZREG_R(ZZ9K_ETH_TX);
               if (size == 0) {
                       if_statinc(ifp, if_opackets);
               } else {
                       if_statinc(ifp, if_oerrors);
               }
       }

       ifp->if_flags &= ~IFF_OACTIVE;
}

static int
zzif_intr(void *arg)
{
       struct zzif_softc *sc = arg;

       uint16_t conf = ZZREG_R(ZZ9K_CONFIG);
       if ((conf & ZZ9K_CONFIG_INT_ETH) == 0)
               return 0;

       ZZREG_W(ZZ9K_CONFIG, conf & ~ZZ9K_CONFIG_INT_ETH);  /* disable INT */
       ZZREG_W(ZZ9K_CONFIG, ZZ9K_CONFIG_INT_ACK | ZZ9K_CONFIG_INT_ACK_ETH);

       struct zzif_frame *frame = (struct zzif_frame *)sc->sc_rxbuffer;
       struct ifnet *ifp = &sc->sc_ethercom.ec_if;
       struct mbuf *m;

       /* check if interrupt was due to new packet arrival */
       if (frame->serial == sc->sc_sequence) {
               ZZREG_W(ZZ9K_ETH_RX, 1);        /* discard packet */
               ZZREG_W(ZZ9K_CONFIG, conf);     /* restore interrupt */
               return 0;       /* nope, something else triggered it */
       }

       sc->sc_sequence = frame->serial;

       if ((frame->size < (ETHER_MIN_LEN-ETHER_CRC_LEN)) ||
           (frame->size > ETHER_MAX_LEN)) {
               aprint_error_dev(sc->sc_dev,
                   ": abnormal rx frame size of %i bytes\n", frame->size);
               ZZREG_W(ZZ9K_ETH_RX, 1);        /* discard packet */
               ZZREG_W(ZZ9K_CONFIG, conf);     /* restore interrupt */
               return 0;
       }

       int s = splvm();
       m = m_devget((char *)&frame->header, frame->size, 0, ifp);
       if_percpuq_enqueue(ifp->if_percpuq, m);
       splx(s);
       ZZREG_W(ZZ9K_ETH_RX, 1);        /* packet served */
       ZZREG_W(ZZ9K_CONFIG, conf);     /* restore interrupt */

       return 1;
}

static int
zzif_ioctl(struct ifnet *ifp, u_long cmd, void *data)
{
       struct zzif_softc *sc = ifp->if_softc;
       struct ifaddr *ifa;
       struct if_laddrreq *lar;
       const struct sockaddr_dl *sdl;
       int retval = 0;

       int s = splvm();

       switch (cmd) {
       case SIOCINITIFADDR:
               ifa = (struct ifaddr *)data;
               zzif_stop(sc);
               zzif_init(sc);
               switch (ifa->ifa_addr->sa_family) {
               case AF_INET:
                       arp_ifinit(ifp, ifa);
                       break;
               default:
                       break;
               }
               break;
       case SIOCSIFFLAGS:
               retval = ifioctl_common(ifp, cmd, data);
               if (retval != 0)
                       break;

               switch (ifp->if_flags & (IFF_UP | IFF_RUNNING)) {
               case IFF_RUNNING: /* and not UP */
                       zzif_stop(sc);
                       break;
               case IFF_UP: /* and not RUNNING */
                       zzif_init(sc);
                       break;
               case (IFF_UP | IFF_RUNNING):
                       zzif_stop(sc);
                       zzif_init(sc);
                       break;
               default:
                       break;
               }
               break;
       case SIOCADDMULTI:
       case SIOCDELMULTI:
               retval = EINVAL;
               break;
       case SIOCALIFADDR:
               lar = (struct if_laddrreq *)data;
               sdl = satocsdl(&lar->addr);
               uint8_t *mac = (uint8_t *)&sdl->sdl_addr.dl_data;

               if ((lar->flags==IFLR_ACTIVE) && (sdl->sdl_family==AF_LINK)) {
                       ZZREG_W(ZZ9K_ETH_MAC_HI, (mac[0] << 8) | mac[1]);
                       ZZREG_W(ZZ9K_ETH_MAC_MD, (mac[2] << 8) | mac[3]);
                       ZZREG_W(ZZ9K_ETH_MAC_LO, (mac[4] << 8) | mac[5]);
               }
               aprint_normal(": Ethernet address %s", ether_sprintf(mac));
               retval = ether_ioctl(ifp, cmd, data);
               break;
       default:
               retval = ether_ioctl(ifp, cmd, data);
               break;
       }

       splx(s);

       return retval;
}

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