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
49static int
50coresight_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
110static int
111coresight_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
130struct coresight_platform_data *
131coresight_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}
154