sys/arm64/coresight/coresight_fdt.c

   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 <dev/ofw/ofw_bus.h>
  45 #include <dev/ofw/ofw_bus_subr.h>
  46
  47 #include <arm64/coresight/coresight.h>
  48
  49 static int
  50 coresight_fdt_get_ports(phandle_t dev_node,
  51     struct coresight_platform_data *pdata)
  52 {
  53         phandle_t node, child;
  54         pcell_t port_reg;
  55         phandle_t xref;
  56         char *name;
  57         int ret;
  58         phandle_t endpoint_child;
  59         struct endpoint *endp;
  60
  61         child = ofw_bus_find_child(dev_node, "ports");
  62         if (child)
  63                 node = child;
  64         else
  65                 node = dev_node;
  66
  67         for (child = OF_child(node); child != 0; child = OF_peer(child)) {
  68                 ret = OF_getprop_alloc(child, "name", (void **)&name);
  69                 if (ret == -1)
  70                         continue;
  71
  72                 if (strcasecmp(name, "port") ||
  73                     strncasecmp(name, "port@", 6)) {
  74                         port_reg = -1;
  75                         OF_getencprop(child, "reg", (void *)&port_reg,
  76                             sizeof(port_reg));
  77
  78                         endpoint_child = ofw_bus_find_child(child, "endpoint");
  79                         if (endpoint_child) {
  80                                 if (OF_getencprop(endpoint_child,
  81                                     "remote-endpoint", &xref,
  82                                     sizeof(xref)) == -1) {
  83                                         printf("failed\n");
  84                                         continue;
  85                                 }
  86                                 endp = malloc(sizeof(struct endpoint),
  87                                     M_CORESIGHT, M_WAITOK | M_ZERO);
  88                                 endp->my_node = endpoint_child;
  89                                 endp->their_node = OF_node_from_xref(xref);
  90                                 endp->dev_node = dev_node;
  91                                 endp->reg = port_reg;
  92                                 if (OF_getproplen(endpoint_child,
  93                                     "slave-mode") >= 0) {
  94                                         pdata->in_ports++;
  95                                         endp->input = 1;
  96                                 } else
  97                                         pdata->out_ports++;
  98
  99                                 mtx_lock(&pdata->mtx_lock);
 100                                 TAILQ_INSERT_TAIL(&pdata->endpoints,
 101                                     endp, link);
 102                                 mtx_unlock(&pdata->mtx_lock);
 103                         }
 104                 }
 105         }
 106
 107         return (0);
 108 }
 109
 110 static int
 111 coresight_fdt_get_cpu(phandle_t node,
 112     struct coresight_platform_data *pdata)
 113 {
 114         phandle_t cpu_node;
 115         pcell_t xref;
 116         pcell_t cpu_reg;
 117
 118         if (OF_getencprop(node, "cpu", &xref, sizeof(xref)) != -1) {
 119                 cpu_node = OF_node_from_xref(xref);
 120                 if (OF_getencprop(cpu_node, "reg", (void *)&cpu_reg,
 121                         sizeof(cpu_reg)) > 0) {
 122                         pdata->cpu = cpu_reg;
 123                         return (0);
 124                 }
 125         }
 126
 127         return (-1);
 128 }
 129
 130 struct coresight_platform_data *
 131 coresight_fdt_get_platform_data(device_t dev)
 132 {
 133         struct coresight_platform_data *pdata;
 134         phandle_t node;
 135
 136         node = ofw_bus_get_node(dev);
 137
 138         pdata = malloc(sizeof(struct coresight_platform_data),
 139             M_CORESIGHT, M_WAITOK | M_ZERO);
 140         pdata->bus_type = CORESIGHT_BUS_FDT;
 141
 142         mtx_init(&pdata->mtx_lock, "Coresight Platform Data", NULL, MTX_DEF);
 143         TAILQ_INIT(&pdata->endpoints);
 144
 145         coresight_fdt_get_cpu(node, pdata);
 146         coresight_fdt_get_ports(node, pdata);
 147
 148         if (bootverbose)
 149                 printf("Total ports: in %d out %d\n",
 150                     pdata->in_ports, pdata->out_ports);
 151
 152         return (pdata);
 153 }