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1 /*-
2  * Copyright (c) 2018 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 MALLOC_DEFINE(M_CORESIGHT, "coresight", "ARM Coresight");
50 static struct mtx cs_mtx;
51
52 struct coresight_device_list cs_devs;
53
54 static int
55 coresight_get_ports(phandle_t dev_node,
56     struct coresight_platform_data *pdata)
57 {
58         phandle_t node, child;
59         pcell_t port_reg;
60         phandle_t xref;
61         char *name;
62         int ret;
63         phandle_t endpoint_child;
64         struct endpoint *endp;
65
66         child = ofw_bus_find_child(dev_node, "ports");
67         if (child)
68                 node = child;
69         else
70                 node = dev_node;
71
72         for (child = OF_child(node); child != 0; child = OF_peer(child)) {
73                 ret = OF_getprop_alloc(child, "name", (void **)&name);
74                 if (ret == -1)
75                         continue;
76
77                 if (strcasecmp(name, "port") ||
78                     strncasecmp(name, "port@", 6)) {
79
80                         port_reg = -1;
81                         OF_getencprop(child, "reg", (void *)&port_reg, sizeof(port_reg));
82
83                         endpoint_child = ofw_bus_find_child(child, "endpoint");
84                         if (endpoint_child) {
85                                 if (OF_getencprop(endpoint_child, "remote-endpoint", &xref,
86                                     sizeof(xref)) == -1) {
87                                         printf("failed\n");
88                                         continue;
89                                 }
90                                 endp = malloc(sizeof(struct endpoint), M_CORESIGHT,
91                                     M_WAITOK | M_ZERO);
92                                 endp->my_node = endpoint_child;
93                                 endp->their_node = OF_node_from_xref(xref);
94                                 endp->dev_node = dev_node;
95                                 endp->reg = port_reg;
96                                 if (OF_getproplen(endpoint_child, "slave-mode") >= 0) {
97                                         pdata->in_ports++;
98                                         endp->slave = 1;
99                                 } else {
100                                         pdata->out_ports++;
101                                 }
102
103                                 mtx_lock(&pdata->mtx_lock);
104                                 TAILQ_INSERT_TAIL(&pdata->endpoints, endp, link);
105                                 mtx_unlock(&pdata->mtx_lock);
106                         }
107                 }
108         }
109
110         return (0);
111 }
112
113 int
114 coresight_register(struct coresight_desc *desc)
115 {
116         struct coresight_device *cs_dev;
117
118         cs_dev = malloc(sizeof(struct coresight_device),
119             M_CORESIGHT, M_WAITOK | M_ZERO);
120         cs_dev->dev = desc->dev;
121         cs_dev->node = ofw_bus_get_node(desc->dev);
122         cs_dev->pdata = desc->pdata;
123         cs_dev->dev_type = desc->dev_type;
124
125         mtx_lock(&cs_mtx);
126         TAILQ_INSERT_TAIL(&cs_devs, cs_dev, link);
127         mtx_unlock(&cs_mtx);
128
129         return (0);
130 }
131
132 struct endpoint *
133 coresight_get_output_endpoint(struct coresight_platform_data *pdata)
134 {
135         struct endpoint *endp;
136
137         if (pdata->out_ports != 1)
138                 return (NULL);
139
140         TAILQ_FOREACH(endp, &pdata->endpoints, link) {
141                 if (endp->slave == 0)
142                         return (endp);
143         }
144
145         return (NULL);
146 }
147
148 struct coresight_device *
149 coresight_get_output_device(struct endpoint *endp, struct endpoint **out_endp)
150 {
151         struct coresight_device *cs_dev;
152         struct endpoint *endp2;
153
154         TAILQ_FOREACH(cs_dev, &cs_devs, link) {
155                 TAILQ_FOREACH(endp2, &cs_dev->pdata->endpoints, link) {
156                         if (endp->their_node == endp2->my_node) {
157                                 *out_endp = endp2;
158                                 return (cs_dev);
159                         }
160                 }
161         }
162
163         return (NULL);
164 }
165
166 static int
167 coresight_get_cpu(phandle_t node,
168     struct coresight_platform_data *pdata)
169 {
170         phandle_t cpu_node;
171         pcell_t xref;
172         pcell_t cpu_reg;
173
174         if (OF_getencprop(node, "cpu", &xref, sizeof(xref)) != -1) {
175                 cpu_node = OF_node_from_xref(xref);
176                 if (OF_getencprop(cpu_node, "reg", (void *)&cpu_reg,
177                         sizeof(cpu_reg)) > 0) {
178                         pdata->cpu = cpu_reg;
179                         return (0);
180                 }
181         }
182
183         return (-1);
184 }
185
186 struct coresight_platform_data *
187 coresight_get_platform_data(device_t dev)
188 {
189         struct coresight_platform_data *pdata;
190         phandle_t node;
191
192         node = ofw_bus_get_node(dev);
193
194         pdata = malloc(sizeof(struct coresight_platform_data),
195             M_CORESIGHT, M_WAITOK | M_ZERO);
196         mtx_init(&pdata->mtx_lock, "Coresight Platform Data", NULL, MTX_DEF);
197         TAILQ_INIT(&pdata->endpoints);
198
199         coresight_get_cpu(node, pdata);
200         coresight_get_ports(node, pdata);
201
202         if (bootverbose)
203                 printf("Total ports: in %d out %d\n",
204                     pdata->in_ports, pdata->out_ports);
205
206         return (pdata);
207 }
208
209 static void
210 coresight_init(void)
211 {
212
213         mtx_init(&cs_mtx, "ARM Coresight", NULL, MTX_DEF);
214         TAILQ_INIT(&cs_devs);
215 }
216
217 SYSINIT(coresight, SI_SUB_DRIVERS, SI_ORDER_FIRST, coresight_init, NULL);