sys/arm64/coresight/coresight_funnel.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_funnel.h>
  45
  46 #include "coresight_if.h"
  47
  48 #define FUNNEL_DEBUG
  49 #undef FUNNEL_DEBUG
  50
  51 #ifdef FUNNEL_DEBUG
  52 #define dprintf(fmt, ...)       printf(fmt, ##__VA_ARGS__)
  53 #else
  54 #define dprintf(fmt, ...)
  55 #endif
  56
  57 static struct resource_spec funnel_spec[] = {
  58         { SYS_RES_MEMORY,       0,      RF_ACTIVE },
  59         { -1, 0 }
  60 };
  61
  62 static int
  63 funnel_init(device_t dev)
  64 {
  65         struct funnel_softc *sc;
  66
  67         sc = device_get_softc(dev);
  68         if (sc->hwtype == HWTYPE_STATIC_FUNNEL)
  69                 return (0);
  70
  71         /* Unlock Coresight */
  72         bus_write_4(sc->res, CORESIGHT_LAR, CORESIGHT_UNLOCK);
  73         dprintf("Device ID: %x\n", bus_read_4(sc->res, FUNNEL_DEVICEID));
  74
  75         return (0);
  76 }
  77
  78 static int
  79 funnel_enable(device_t dev, struct endpoint *endp,
  80     struct coresight_event *event)
  81 {
  82         struct funnel_softc *sc;
  83         uint32_t reg;
  84
  85         sc = device_get_softc(dev);
  86         if (sc->hwtype == HWTYPE_STATIC_FUNNEL)
  87                 return (0);
  88
  89         reg = bus_read_4(sc->res, FUNNEL_FUNCTL);
  90         reg &= ~(FUNCTL_HOLDTIME_MASK);
  91         reg |= (7 << FUNCTL_HOLDTIME_SHIFT);
  92         reg |= (1 << endp->reg);
  93         bus_write_4(sc->res, FUNNEL_FUNCTL, reg);
  94
  95         return (0);
  96 }
  97
  98 static void
  99 funnel_disable(device_t dev, struct endpoint *endp,
 100     struct coresight_event *event)
 101 {
 102         struct funnel_softc *sc;
 103         uint32_t reg;
 104
 105         sc = device_get_softc(dev);
 106         if (sc->hwtype == HWTYPE_STATIC_FUNNEL)
 107                 return;
 108
 109         reg = bus_read_4(sc->res, FUNNEL_FUNCTL);
 110         reg &= ~(1 << endp->reg);
 111         bus_write_4(sc->res, FUNNEL_FUNCTL, reg);
 112 }
 113
 114 int
 115 funnel_attach(device_t dev)
 116 {
 117         struct coresight_desc desc;
 118         struct funnel_softc *sc;
 119
 120         sc = device_get_softc(dev);
 121         if (sc->hwtype == HWTYPE_FUNNEL &&
 122             bus_alloc_resources(dev, funnel_spec, &sc->res) != 0) {
 123                 device_printf(dev, "cannot allocate resources for device\n");
 124                 return (ENXIO);
 125         }
 126
 127         desc.pdata = sc->pdata;
 128         desc.dev = dev;
 129         desc.dev_type = CORESIGHT_FUNNEL;
 130         coresight_register(&desc);
 131
 132         return (0);
 133 }
 134
 135 static device_method_t funnel_methods[] = {
 136         /* Coresight interface */
 137         DEVMETHOD(coresight_init,       funnel_init),
 138         DEVMETHOD(coresight_enable,     funnel_enable),
 139         DEVMETHOD(coresight_disable,    funnel_disable),
 140         DEVMETHOD_END
 141 };
 142
 143 DEFINE_CLASS_0(funnel, funnel_driver, funnel_methods,
 144     sizeof(struct funnel_softc));