2 files changed, 230 insertions, 0 deletions

diff --git a/sys/dev/ofw/ofw_graph.c b/sys/dev/ofw/ofw_graph.c
new file mode 100644
index 000000000000..0ef53486804d
--- /dev/null
+++ b/sys/dev/ofw/ofw_graph.c
@@ -0,0 +1,186 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2019 Emmanuel Vadot <manu@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification, immediately at the beginning of the file.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include "opt_platform.h"
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/bus.h>
+#include <sys/errno.h>
+
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+#include <dev/ofw/ofw_graph.h>
+#include <dev/ofw/openfirm.h>
+
+#include "ofw_bus_if.h"
+
+#define	PORT_MAX_NAME	8
+
+phandle_t
+ofw_graph_get_port_by_idx(phandle_t node, uint32_t idx)
+{
+	phandle_t ports, child;
+	uint32_t reg;
+	char portnode[PORT_MAX_NAME];
+
+	/* First try to find a port@<idx> node */
+	snprintf(portnode, sizeof(portnode), "port@%d", idx);
+	child = ofw_bus_find_child(node, portnode);
+	if (child != 0)
+		return (child);
+
+	/* Next try to look under ports */
+	ports = ofw_bus_find_child(node, "ports");
+	if (ports == 0)
+		return (0);
+
+	for (child = OF_child(ports); child != 0; child = OF_peer(child)) {
+		if (OF_getencprop(child, "reg", &reg, sizeof(uint32_t)) <= 0 ||
+		    reg != idx)
+			continue;
+
+		return (child);
+	}
+
+	return (0);
+}
+
+size_t
+ofw_graph_port_get_num_endpoints(phandle_t port)
+{
+	phandle_t child;
+	char *name;
+	size_t num = 0;
+	int ret;
+
+	for (num = 0, child = OF_child(port); child != 0;
+	     child = OF_peer(child)) {
+		ret = OF_getprop_alloc(child, "name", (void **)&name);
+		if (ret == -1)
+			continue;
+		if (strcmp(name, "endpoint") == 0)
+			num++;
+		else if (strncmp(name, "endpoint@", 9) == 0)
+			num++;
+		free(name, M_OFWPROP);
+	}
+
+	return (num);
+}
+
+phandle_t
+ofw_graph_get_endpoint_by_idx(phandle_t port, uint32_t idx)
+{
+	phandle_t endpoint, child;
+	uint32_t reg;
+
+	/* First test if we have only one endpoint */
+	endpoint = ofw_bus_find_child(port, "endpoint");
+	if (endpoint != 0)
+		return (endpoint);
+
+	/* Then test all childs based on the reg property */
+	for (child = OF_child(port); child != 0; child = OF_peer(child)) {
+		if (OF_getencprop(child, "reg", &reg, sizeof(uint32_t)) <= 0 ||
+		    reg != idx)
+			continue;
+
+		return (child);
+	}
+
+	return (0);
+}
+
+phandle_t
+ofw_graph_get_remote_endpoint(phandle_t endpoint)
+{
+	phandle_t remote;
+
+	if (OF_getencprop(endpoint, "remote-endpoint", &remote,
+	      sizeof(phandle_t)) <= 0)
+		return (0);
+
+	return (remote);
+}
+
+phandle_t
+ofw_graph_get_remote_parent(phandle_t remote)
+{
+	phandle_t node;
+	char *name;
+	int ret;
+
+	/* get the endpoint node */
+	node = OF_node_from_xref(remote);
+
+	/* go to the port@X node */
+	node = OF_parent(node);
+	/* go to the ports node or parent */
+	node = OF_parent(node);
+
+	/* if the node name is 'ports' we need to go up one last time */
+	ret = OF_getprop_alloc(node, "name", (void **)&name);
+	if (ret == -1) {
+		printf("%s: Node %x don't have a name, abort\n", __func__, node);
+		node = 0;
+		goto end;
+	}
+	if (strcmp("ports", name) == 0)
+		node = OF_parent(node);
+
+end:
+	free(name, M_OFWPROP);
+	return (node);
+}
+
+device_t
+ofw_graph_get_device_by_port_ep(phandle_t node, uint32_t port_id, uint32_t ep_id)
+{
+	phandle_t outport, port, endpoint, remote;
+
+	port = ofw_graph_get_port_by_idx(node, port_id);
+	if (port == 0)
+		return (NULL);
+	endpoint = ofw_graph_get_endpoint_by_idx(port, ep_id);
+	if (endpoint == 0)
+		return NULL;
+	remote = ofw_graph_get_remote_endpoint(endpoint);
+	if (remote == 0)
+		return (NULL);
+	outport = ofw_graph_get_remote_parent(remote);
+	if (outport == 0)
+		return (NULL);
+
+	return (OF_device_from_xref(OF_xref_from_node(outport)));
+}
diff --git a/sys/dev/ofw/ofw_graph.h b/sys/dev/ofw/ofw_graph.h
new file mode 100644
index 000000000000..5a7ab3a471ef
--- /dev/null
+++ b/sys/dev/ofw/ofw_graph.h
@@ -0,0 +1,44 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2019 Emmanuel Vadot <manu@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification, immediately at the beginning of the file.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef	_OFW_GRAPH_H_
+#define	_OFW_GRAPH_H_
+
+phandle_t ofw_graph_get_port_by_idx(phandle_t node, uint32_t idx);
+phandle_t ofw_graph_get_remote_endpoint(phandle_t endpoint);
+size_t ofw_graph_port_get_num_endpoints(phandle_t port);
+phandle_t ofw_graph_get_endpoint_by_idx(phandle_t port, uint32_t idx);
+phandle_t ofw_graph_get_remote_parent(phandle_t remote);
+
+device_t ofw_graph_get_device_by_port_ep(phandle_t node, uint32_t port_id, uint32_t ep_id);
+
+#endif /* _OFW_GRAPH_H_ */
+