sys/arm64/coresight/coresight_replicator.c

   1 /*-
   2  * Copyright (c) 2018-2020 Ruslan Bukin <br@bsdpad.com>
   3  * All rights reserved.
   4  *
   5  * This software was developed by BAE Systems, the University of Cambridge
   6  * Computer Laboratory, and Memorial University under DARPA/AFRL contract
   7  * FA8650-15-C-7558 ("CADETS"), as part of the DARPA Transparent Computing
   8  * (TC) research program.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 __FBSDID("$FreeBSD$");
  34
  35 #include <sys/param.h>
  36 #include <sys/systm.h>
  37 #include <sys/bus.h>
  38 #include <sys/rman.h>
  39 #include <sys/kernel.h>
  40 #include <sys/module.h>
  41 #include <machine/bus.h>
  42
  43 #include <arm64/coresight/coresight.h>
  44 #include <arm64/coresight/coresight_replicator.h>
  45
  46 #include "coresight_if.h"
  47
  48 static struct resource_spec replicator_spec[] = {
  49         { SYS_RES_MEMORY,       0,      RF_ACTIVE },
  50         { -1, 0 }
  51 };
  52
  53 static int
  54 replicator_init(device_t dev)
  55 {
  56         struct replicator_softc *sc;
  57
  58         sc = device_get_softc(dev);
  59
  60         /* Unlock Coresight */
  61         bus_write_4(sc->res, CORESIGHT_LAR, CORESIGHT_UNLOCK);
  62
  63         return (0);
  64 }
  65
  66 static int
  67 replicator_enable(device_t dev, struct endpoint *endp,
  68     struct coresight_event *event)
  69 {
  70         struct replicator_softc *sc;
  71
  72         sc = device_get_softc(dev);
  73
  74         /* Enable the port. Keep the other port disabled */
  75         if (endp->reg == 0) {
  76                 bus_write_4(sc->res, REPLICATOR_IDFILTER0, 0x00);
  77                 bus_write_4(sc->res, REPLICATOR_IDFILTER1, 0xff);
  78         } else {
  79                 bus_write_4(sc->res, REPLICATOR_IDFILTER0, 0xff);
  80                 bus_write_4(sc->res, REPLICATOR_IDFILTER1, 0x00);
  81         }
  82
  83         return (0);
  84 }
  85
  86 static void
  87 replicator_disable(device_t dev, struct endpoint *endp,
  88     struct coresight_event *event)
  89 {
  90         struct replicator_softc *sc;
  91
  92         sc = device_get_softc(dev);
  93
  94         bus_write_4(sc->res, REPLICATOR_IDFILTER0, 0xff);
  95         bus_write_4(sc->res, REPLICATOR_IDFILTER1, 0xff);
  96 }
  97
  98 int
  99 replicator_attach(device_t dev)
 100 {
 101         struct replicator_softc *sc;
 102         struct coresight_desc desc;
 103
 104         sc = device_get_softc(dev);
 105
 106         if (bus_alloc_resources(dev, replicator_spec, &sc->res) != 0) {
 107                 device_printf(dev, "cannot allocate resources for device\n");
 108                 return (ENXIO);
 109         }
 110
 111         desc.pdata = sc->pdata;
 112         desc.dev = dev;
 113         desc.dev_type = CORESIGHT_DYNAMIC_REPLICATOR;
 114         coresight_register(&desc);
 115
 116         return (0);
 117 }
 118
 119 static device_method_t replicator_methods[] = {
 120         /* Coresight interface */
 121         DEVMETHOD(coresight_init,       replicator_init),
 122         DEVMETHOD(coresight_enable,     replicator_enable),
 123         DEVMETHOD(coresight_disable,    replicator_disable),
 124         DEVMETHOD_END
 125 };
 126
 127 DEFINE_CLASS_0(replicator, replicator_driver, replicator_methods,
 128     sizeof(struct replicator_softc));