coresight.c

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    1 /*-
    2  * Copyright (c) 2018-2020 Ruslan Bukin <br@bsdpad.com>
    3  * All rights reserved.
    4  *
    5  * This software was developed by SRI International and the University of
    6  * Cambridge Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237
    7  * ("CTSRD"), as part of the DARPA CRASH research programme.
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   28  * SUCH DAMAGE.
   29  */
   30 
   31 #include <sys/cdefs.h>
   32 __FBSDID("$FreeBSD$");
   33 
   34 #include <sys/param.h>
   35 #include <sys/systm.h>
   36 #include <sys/bus.h>
   37 #include <sys/rman.h>
   38 #include <sys/kernel.h>
   39 #include <sys/lock.h>
   40 #include <sys/module.h>
   41 #include <sys/mutex.h>
   42 #include <machine/bus.h>
   43 
   44 #include <arm64/coresight/coresight.h>
   45 
   46 static struct mtx cs_mtx;
   47 struct coresight_device_list cs_devs;
   48 
   49 int
   50 coresight_register(struct coresight_desc *desc)
   51 {
   52         struct coresight_device *cs_dev;
   53 
   54         cs_dev = malloc(sizeof(struct coresight_device),
   55             M_CORESIGHT, M_WAITOK | M_ZERO);
   56         cs_dev->dev = desc->dev;
   57         cs_dev->pdata = desc->pdata;
   58         cs_dev->dev_type = desc->dev_type;
   59 
   60         mtx_lock(&cs_mtx);
   61         TAILQ_INSERT_TAIL(&cs_devs, cs_dev, link);
   62         mtx_unlock(&cs_mtx);
   63 
   64         return (0);
   65 }
   66 
   67 struct endpoint *
   68 coresight_get_output_endpoint(struct coresight_platform_data *pdata)
   69 {
   70         struct endpoint *endp;
   71 
   72         if (pdata->out_ports != 1)
   73                 return (NULL);
   74 
   75         TAILQ_FOREACH(endp, &pdata->endpoints, link) {
   76                 if (endp->input == 0)
   77                         return (endp);
   78         }
   79 
   80         return (NULL);
   81 }
   82 
   83 struct coresight_device *
   84 coresight_get_output_device(struct endpoint *endp, struct endpoint **out_endp)
   85 {
   86         struct coresight_platform_data *pdata;
   87         struct coresight_device *cs_dev;
   88         struct endpoint *endp2;
   89 
   90         TAILQ_FOREACH(cs_dev, &cs_devs, link) {
   91                 pdata = cs_dev->pdata;
   92                 TAILQ_FOREACH(endp2, &cs_dev->pdata->endpoints, link) {
   93                         switch (pdata->bus_type) {
   94                         case CORESIGHT_BUS_FDT:
   95 #ifdef FDT
   96                                 if (endp->their_node == endp2->my_node) {
   97                                         *out_endp = endp2;
   98                                         return (cs_dev);
   99                                 }
  100 #endif
  101                                 break;
  102 
  103                         case CORESIGHT_BUS_ACPI:
  104 #ifdef DEV_ACPI
  105                                 if (endp->their_handle == endp2->my_handle) {
  106                                         *out_endp = endp2;
  107                                         return (cs_dev);
  108                                 }
  109 #endif
  110                                 break;
  111                         }
  112                 }
  113         }
  114 
  115         return (NULL);
  116 }
  117 
  118 static void
  119 coresight_init(void)
  120 {
  121 
  122         mtx_init(&cs_mtx, "ARM Coresight", NULL, MTX_DEF);
  123         TAILQ_INIT(&cs_devs);
  124 }
  125 
  126 SYSINIT(coresight, SI_SUB_DRIVERS, SI_ORDER_FIRST, coresight_init, NULL);

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FreeBSD/Linux Kernel Cross Reference sys/arm64/coresight/coresight.c

FreeBSD/Linux Kernel Cross Reference
sys/arm64/coresight/coresight.c