sys/arm64/coresight/coresight_funnel.c

   1 /*-
   2  * Copyright (c) 2018 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 <dev/ofw/ofw_bus.h>
  47 #include <dev/ofw/ofw_bus_subr.h>
  48
  49 #include "coresight_if.h"
  50
  51 #define FUNNEL_DEBUG
  52 #undef FUNNEL_DEBUG
  53
  54 #ifdef FUNNEL_DEBUG
  55 #define dprintf(fmt, ...)       printf(fmt, ##__VA_ARGS__)
  56 #else
  57 #define dprintf(fmt, ...)
  58 #endif
  59
  60 static struct ofw_compat_data compat_data[] = {
  61         { "arm,coresight-funnel",               1 },
  62         { NULL,                                 0 }
  63 };
  64
  65 struct funnel_softc {
  66         struct resource                 *res;
  67         struct coresight_platform_data  *pdata;
  68 };
  69
  70 static struct resource_spec funnel_spec[] = {
  71         { SYS_RES_MEMORY,       0,      RF_ACTIVE },
  72         { -1, 0 }
  73 };
  74
  75 static int
  76 funnel_init(device_t dev)
  77 {
  78         struct funnel_softc *sc;
  79
  80         sc = device_get_softc(dev);
  81
  82         /* Unlock Coresight */
  83         bus_write_4(sc->res, CORESIGHT_LAR, CORESIGHT_UNLOCK);
  84
  85         dprintf("Device ID: %x\n", bus_read_4(sc->res, FUNNEL_DEVICEID));
  86
  87         return (0);
  88 }
  89
  90 static int
  91 funnel_enable(device_t dev, struct endpoint *endp,
  92     struct coresight_event *event)
  93 {
  94         struct funnel_softc *sc;
  95         uint32_t reg;
  96
  97         sc = device_get_softc(dev);
  98
  99         reg = bus_read_4(sc->res, FUNNEL_FUNCTL);
 100         reg &= ~(FUNCTL_HOLDTIME_MASK);
 101         reg |= (7 << FUNCTL_HOLDTIME_SHIFT);
 102         reg |= (1 << endp->reg);
 103         bus_write_4(sc->res, FUNNEL_FUNCTL, reg);
 104
 105         return (0);
 106 }
 107
 108 static void
 109 funnel_disable(device_t dev, struct endpoint *endp,
 110     struct coresight_event *event)
 111 {
 112         struct funnel_softc *sc;
 113         uint32_t reg;
 114
 115         sc = device_get_softc(dev);
 116
 117         reg = bus_read_4(sc->res, FUNNEL_FUNCTL);
 118         reg &= ~(1 << endp->reg);
 119         bus_write_4(sc->res, FUNNEL_FUNCTL, reg);
 120 }
 121
 122 static int
 123 funnel_probe(device_t dev)
 124 {
 125
 126         if (!ofw_bus_status_okay(dev))
 127                 return (ENXIO);
 128
 129         if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
 130                 return (ENXIO);
 131
 132         device_set_desc(dev, "Coresight Funnel");
 133
 134         return (BUS_PROBE_DEFAULT);
 135 }
 136
 137 static int
 138 funnel_attach(device_t dev)
 139 {
 140         struct coresight_desc desc;
 141         struct funnel_softc *sc;
 142
 143         sc = device_get_softc(dev);
 144
 145         if (bus_alloc_resources(dev, funnel_spec, &sc->res) != 0) {
 146                 device_printf(dev, "cannot allocate resources for device\n");
 147                 return (ENXIO);
 148         }
 149
 150         sc->pdata = coresight_get_platform_data(dev);
 151         desc.pdata = sc->pdata;
 152         desc.dev = dev;
 153         desc.dev_type = CORESIGHT_FUNNEL;
 154         coresight_register(&desc);
 155
 156         return (0);
 157 }
 158
 159 static device_method_t funnel_methods[] = {
 160         /* Device interface */
 161         DEVMETHOD(device_probe,         funnel_probe),
 162         DEVMETHOD(device_attach,        funnel_attach),
 163
 164         /* Coresight interface */
 165         DEVMETHOD(coresight_init,       funnel_init),
 166         DEVMETHOD(coresight_enable,     funnel_enable),
 167         DEVMETHOD(coresight_disable,    funnel_disable),
 168         DEVMETHOD_END
 169 };
 170
 171 static driver_t funnel_driver = {
 172         "funnel",
 173         funnel_methods,
 174         sizeof(struct funnel_softc),
 175 };
 176
 177 static devclass_t funnel_devclass;
 178
 179 DRIVER_MODULE(funnel, simplebus, funnel_driver, funnel_devclass, 0, 0);
 180 MODULE_VERSION(funnel, 1);