FreeBSD/Linux Kernel Cross Reference
sys/dev/le/if_le_lebuffer.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-NetBSD
      *
      * Copyright (c) 2006 Marius Strobl <marius@FreeBSD.org>
      * 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.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 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/cdefs.h>
    __FBSDID("$FreeBSD: releng/12.0/sys/dev/le/if_le_lebuffer.c 326255 2017-11-27 14:52:40Z pfg $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/bus.h>
    #include <sys/endian.h>
    #include <sys/kernel.h>
    #include <sys/lock.h>
    #include <sys/module.h>
    #include <sys/mutex.h>
    #include <sys/resource.h>
    #include <sys/rman.h>
    #include <sys/socket.h>
    
    #include <dev/ofw/ofw_bus.h>
    
    #include <machine/bus.h>
    #include <machine/ofw_machdep.h>
    #include <machine/resource.h>
    
    #include <net/ethernet.h>
    #include <net/if.h>
    #include <net/if_media.h>
    
    #include <dev/le/lancereg.h>
    #include <dev/le/lancevar.h>
    #include <dev/le/am7990reg.h>
    #include <dev/le/am7990var.h>
    
    /*
     * LANCE registers
     */
    #define LEREG1_RDP      0       /* Register Data port */
    #define LEREG1_RAP      2       /* Register Address port */
    
    struct le_lebuffer_softc {
            struct am7990_softc     sc_am7990;      /* glue to MI code */
    
            struct resource         *sc_bres;
    
            struct resource         *sc_rres;
    
            struct resource         *sc_ires;
            void                    *sc_ih;
    };
    
    static devclass_t le_lebuffer_devclass;
    
    static device_probe_t le_lebuffer_probe;
    static device_attach_t le_lebuffer_attach;
    static device_detach_t le_lebuffer_detach;
    static device_resume_t le_buffer_resume;
    static device_suspend_t le_buffer_suspend;
    
    static device_method_t le_lebuffer_methods[] = {
            /* Device interface */
            DEVMETHOD(device_probe,         le_lebuffer_probe),
            DEVMETHOD(device_attach,        le_lebuffer_attach),
            DEVMETHOD(device_detach,        le_lebuffer_detach),
            /* We can just use the suspend method here. */
            DEVMETHOD(device_shutdown,      le_buffer_suspend),
            DEVMETHOD(device_suspend,       le_buffer_suspend),
            DEVMETHOD(device_resume,        le_buffer_resume),
    
            { 0, 0 }
    };
    
    DEFINE_CLASS_0(le, le_lebuffer_driver, le_lebuffer_methods,
        sizeof(struct le_lebuffer_softc));
    DRIVER_MODULE(le, lebuffer, le_lebuffer_driver, le_lebuffer_devclass, 0, 0);
   MODULE_DEPEND(le, ether, 1, 1, 1);
   MODULE_DEPEND(le, lebuffer, 1, 1, 1);
   
   /*
    * Media types supported
    */
   static const int le_lebuffer_media[] = {
           IFM_MAKEWORD(IFM_ETHER, IFM_10_T, 0, 0)
   };
   #define NLEMEDIA nitems(le_lebuffer_media)
   
   static void le_lebuffer_wrcsr(struct lance_softc *, uint16_t, uint16_t);
   static uint16_t le_lebuffer_rdcsr(struct lance_softc *, uint16_t);
   static void le_lebuffer_copytodesc(struct lance_softc *, void *, int, int);
   static void le_lebuffer_copyfromdesc(struct lance_softc *, void *, int, int);
   static void le_lebuffer_copytobuf(struct lance_softc *, void *, int, int);
   static void le_lebuffer_copyfrombuf(struct lance_softc *, void *, int, int);
   static void le_lebuffer_zerobuf(struct lance_softc *, int, int);
   
   static void
   le_lebuffer_wrcsr(struct lance_softc *sc, uint16_t port, uint16_t val)
   {
           struct le_lebuffer_softc *lesc = (struct le_lebuffer_softc *)sc;
   
           bus_write_2(lesc->sc_rres, LEREG1_RAP, port);
           bus_barrier(lesc->sc_rres, LEREG1_RAP, 2, BUS_SPACE_BARRIER_WRITE);
           bus_write_2(lesc->sc_rres, LEREG1_RDP, val);
   }
   
   static uint16_t
   le_lebuffer_rdcsr(struct lance_softc *sc, uint16_t port)
   {
           struct le_lebuffer_softc *lesc = (struct le_lebuffer_softc *)sc;
   
           bus_write_2(lesc->sc_rres, LEREG1_RAP, port);
           bus_barrier(lesc->sc_rres, LEREG1_RAP, 2, BUS_SPACE_BARRIER_WRITE);
           return (bus_read_2(lesc->sc_rres, LEREG1_RDP));
   }
   
   /*
    * It turns out that using bus_space(9) to access the buffers and the
    * descriptors yields way more throughput than accessing them via the
    * KVA returned by rman_get_virtual(9). The descriptor rings can be
    * accessed using 8-bit up to 64-bit operations while the buffers can
    * be only accessed using 8-bit and 16-bit operations.
    * NB:  For whatever reason setting LE_C3_BSWP has no effect with at
    *      least the 501-2981 (although their 'busmaster-regval' property
    *      indicates to set LE_C3_BSWP also for these cards), so we need
    *      to manually byte swap access to the buffers, i.e. the accesses
    *      going through the RX/TX FIFOs.
    */
   
   static void
   le_lebuffer_copytodesc(struct lance_softc *sc, void *fromv, int off, int len)
   {
           struct le_lebuffer_softc *lesc = (struct le_lebuffer_softc *)sc;
           caddr_t from = fromv;
   
           for (; len >= 8; len -= 8, off += 8, from += 8)
                   bus_write_8(lesc->sc_bres, off, be64dec(from));
           for (; len >= 4; len -= 4, off += 4, from += 4)
                   bus_write_4(lesc->sc_bres, off, be32dec(from));
           for (; len >= 2; len -= 2, off += 2, from += 2)
                   bus_write_2(lesc->sc_bres, off, be16dec(from));
           if (len == 1)
                   bus_write_1(lesc->sc_bres, off, *from);
   }
   
   static void
   le_lebuffer_copyfromdesc(struct lance_softc *sc, void *tov, int off, int len)
   {
           struct le_lebuffer_softc *lesc = (struct le_lebuffer_softc *)sc;
           caddr_t to = tov;
   
           for (; len >= 8; len -= 8, off += 8, to += 8)
                   be64enc(to,
                       bus_read_8(lesc->sc_bres, off));
           for (; len >= 4; len -= 4, off += 4, to += 4)
                   be32enc(to,
                       bus_read_4(lesc->sc_bres, off));
           for (; len >= 2; len -= 2, off += 2, to += 2)
                   be16enc(to,
                       bus_read_2(lesc->sc_bres, off));
           if (len == 1)
                   *to = bus_read_1(lesc->sc_bres, off);
   }
   
   static void
   le_lebuffer_copytobuf(struct lance_softc *sc, void *fromv, int off, int len)
   {
           struct le_lebuffer_softc *lesc = (struct le_lebuffer_softc *)sc;
           caddr_t from = fromv;
   
           for (; len >= 2; len -= 2, off += 2, from += 2)
                   bus_write_2(lesc->sc_bres, off, le16dec(from));
           if (len == 1)
                   bus_write_1(lesc->sc_bres, off + 1, *from);
   }
   
   static void
   le_lebuffer_copyfrombuf(struct lance_softc *sc, void *tov, int off, int len)
   {
           struct le_lebuffer_softc *lesc = (struct le_lebuffer_softc *)sc;
           caddr_t to = tov;
   
           for (; len >= 2; len -= 2, off += 2, to += 2)
                   le16enc(to,
                       bus_read_2(lesc->sc_bres, off));
           if (len == 1)
                   *to = bus_read_1(lesc->sc_bres, off + 1);
   }
   
   static void
   le_lebuffer_zerobuf(struct lance_softc *sc, int off, int len)
   {
           struct le_lebuffer_softc *lesc = (struct le_lebuffer_softc *)sc;
   
           for (; len >= 2; len -= 2, off += 2)
                   bus_write_2(lesc->sc_bres, off, 0);
           if (len == 1)
                   bus_write_1(lesc->sc_bres, off + 1, 0);
   }
   
   static int
   le_lebuffer_probe(device_t dev)
   {
   
           if (strcmp(ofw_bus_get_name(dev), "le") == 0) {
                   device_set_desc(dev, "LANCE Ethernet");
                   return (BUS_PROBE_DEFAULT);
           }
           return (ENXIO);
   }
   
   static int
   le_lebuffer_attach(device_t dev)
   {
           struct le_lebuffer_softc *lesc;
           struct lance_softc *sc;
           int error, i;
   
           lesc = device_get_softc(dev);
           sc = &lesc->sc_am7990.lsc;
   
           LE_LOCK_INIT(sc, device_get_nameunit(dev));
   
           /*
            * The "register space" of the parent is just a buffer where the
            * the LANCE descriptor rings and the RX/TX buffers can be stored.
            */
           i = 0;
           lesc->sc_bres = bus_alloc_resource_any(device_get_parent(dev),
               SYS_RES_MEMORY, &i, RF_ACTIVE);
           if (lesc->sc_bres == NULL) {
                   device_printf(dev, "cannot allocate LANCE buffer\n");
                   error = ENXIO;
                   goto fail_mtx;
           }
   
           /* Allocate LANCE registers. */
           i = 0;
           lesc->sc_rres = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
               &i, RF_ACTIVE);
           if (lesc->sc_rres == NULL) {
                   device_printf(dev, "cannot allocate LANCE registers\n");
                   error = ENXIO;
                   goto fail_bres;
           }
   
           /* Allocate LANCE interrupt. */
           i = 0;
           if ((lesc->sc_ires = bus_alloc_resource_any(dev, SYS_RES_IRQ,
               &i, RF_SHAREABLE | RF_ACTIVE)) == NULL) {
                   device_printf(dev, "cannot allocate interrupt\n");
                   error = ENXIO;
                   goto fail_rres;
           }
   
           /*
            * LANCE view is offset by buffer location.
            * Note that we don't use sc->sc_mem.
            */
           sc->sc_addr = 0;
           sc->sc_memsize = rman_get_size(lesc->sc_bres);
           sc->sc_flags = 0;
   
           /* That old black magic... */
           if (OF_getprop(ofw_bus_get_node(dev), "busmaster-regval",
               &sc->sc_conf3, sizeof(sc->sc_conf3)) == -1)
                   sc->sc_conf3 = LE_C3_ACON | LE_C3_BCON;
           /*
            * Make sure LE_C3_BSWP is cleared so that for cards where
            * that flag actually works le_lebuffer_copy{from,to}buf()
            * don't fail...
            */
           sc->sc_conf3 &= ~LE_C3_BSWP;
   
           OF_getetheraddr(dev, sc->sc_enaddr);
   
           sc->sc_copytodesc = le_lebuffer_copytodesc;
           sc->sc_copyfromdesc = le_lebuffer_copyfromdesc;
           sc->sc_copytobuf = le_lebuffer_copytobuf;
           sc->sc_copyfrombuf = le_lebuffer_copyfrombuf;
           sc->sc_zerobuf = le_lebuffer_zerobuf;
   
           sc->sc_rdcsr = le_lebuffer_rdcsr;
           sc->sc_wrcsr = le_lebuffer_wrcsr;
           sc->sc_hwreset = NULL;
           sc->sc_hwinit = NULL;
           sc->sc_hwintr = NULL;
           sc->sc_nocarrier = NULL;
           sc->sc_mediachange = NULL;
           sc->sc_mediastatus = NULL;
           sc->sc_supmedia = le_lebuffer_media;
           sc->sc_nsupmedia = NLEMEDIA;
           sc->sc_defaultmedia = le_lebuffer_media[0];
   
           error = am7990_config(&lesc->sc_am7990, device_get_name(dev),
               device_get_unit(dev));
           if (error != 0) {
                   device_printf(dev, "cannot attach Am7990\n");
                   goto fail_ires;
           }
   
           error = bus_setup_intr(dev, lesc->sc_ires, INTR_TYPE_NET | INTR_MPSAFE,
               NULL, am7990_intr, sc, &lesc->sc_ih);
           if (error != 0) {
                   device_printf(dev, "cannot set up interrupt\n");
                   goto fail_am7990;
           }
   
           return (0);
   
    fail_am7990:
           am7990_detach(&lesc->sc_am7990);
    fail_ires:
           bus_release_resource(dev, SYS_RES_IRQ,
               rman_get_rid(lesc->sc_ires), lesc->sc_ires);
    fail_rres:
           bus_release_resource(dev, SYS_RES_MEMORY,
               rman_get_rid(lesc->sc_rres), lesc->sc_rres);
    fail_bres:
           bus_release_resource(device_get_parent(dev), SYS_RES_MEMORY,
               rman_get_rid(lesc->sc_bres), lesc->sc_bres);
    fail_mtx:
           LE_LOCK_DESTROY(sc);
           return (error);
   }
   
   static int
   le_lebuffer_detach(device_t dev)
   {
           struct le_lebuffer_softc *lesc;
           struct lance_softc *sc;
   
           lesc = device_get_softc(dev);
           sc = &lesc->sc_am7990.lsc;
   
           bus_teardown_intr(dev, lesc->sc_ires, lesc->sc_ih);
           am7990_detach(&lesc->sc_am7990);
           bus_release_resource(dev, SYS_RES_IRQ,
               rman_get_rid(lesc->sc_ires), lesc->sc_ires);
           bus_release_resource(dev, SYS_RES_MEMORY,
               rman_get_rid(lesc->sc_rres), lesc->sc_rres);
           bus_release_resource(device_get_parent(dev), SYS_RES_MEMORY,
               rman_get_rid(lesc->sc_bres), lesc->sc_bres);
           LE_LOCK_DESTROY(sc);
   
           return (0);
   }
   
   static int
   le_buffer_suspend(device_t dev)
   {
           struct le_lebuffer_softc *lesc;
   
           lesc = device_get_softc(dev);
   
           lance_suspend(&lesc->sc_am7990.lsc);
   
           return (0);
   }
   
   static int
   le_buffer_resume(device_t dev)
   {
           struct le_lebuffer_softc *lesc;
   
           lesc = device_get_softc(dev);
   
           lance_resume(&lesc->sc_am7990.lsc);
   
           return (0);
   }

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