1 /*
2 * OMAP Display Subsystem Base
3 *
4 * Copyright (C) 2015-2017 Texas Instruments Incorporated - http://www.ti.com/
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 */
15
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/of.h>
19 #include <linux/of_graph.h>
20 #include <linux/list.h>
21
22 #include "dss.h"
23 #include "omapdss.h"
24
25 static struct dss_device *dss_device;
26
27 static struct list_head omapdss_comp_list;
28
29 struct omapdss_comp_node {
30 struct list_head list;
31 struct device_node *node;
32 bool dss_core_component;
33 };
34
omapdss_get_dss(void)35 struct dss_device *omapdss_get_dss(void)
36 {
37 return dss_device;
38 }
39 EXPORT_SYMBOL(omapdss_get_dss);
40
omapdss_set_dss(struct dss_device * dss)41 void omapdss_set_dss(struct dss_device *dss)
42 {
43 dss_device = dss;
44 }
45 EXPORT_SYMBOL(omapdss_set_dss);
46
dispc_get_dispc(struct dss_device * dss)47 struct dispc_device *dispc_get_dispc(struct dss_device *dss)
48 {
49 return dss->dispc;
50 }
51 EXPORT_SYMBOL(dispc_get_dispc);
52
dispc_get_ops(struct dss_device * dss)53 const struct dispc_ops *dispc_get_ops(struct dss_device *dss)
54 {
55 return dss->dispc_ops;
56 }
57 EXPORT_SYMBOL(dispc_get_ops);
58
omapdss_list_contains(const struct device_node * node)59 static bool omapdss_list_contains(const struct device_node *node)
60 {
61 struct omapdss_comp_node *comp;
62
63 list_for_each_entry(comp, &omapdss_comp_list, list) {
64 if (comp->node == node)
65 return true;
66 }
67
68 return false;
69 }
70
omapdss_walk_device(struct device * dev,struct device_node * node,bool dss_core)71 static void omapdss_walk_device(struct device *dev, struct device_node *node,
72 bool dss_core)
73 {
74 struct device_node *n;
75 struct omapdss_comp_node *comp = devm_kzalloc(dev, sizeof(*comp),
76 GFP_KERNEL);
77
78 if (comp) {
79 comp->node = node;
80 comp->dss_core_component = dss_core;
81 list_add(&comp->list, &omapdss_comp_list);
82 }
83
84 /*
85 * of_graph_get_remote_port_parent() prints an error if there is no
86 * port/ports node. To avoid that, check first that there's the node.
87 */
88 n = of_get_child_by_name(node, "ports");
89 if (!n)
90 n = of_get_child_by_name(node, "port");
91 if (!n)
92 return;
93
94 of_node_put(n);
95
96 n = NULL;
97 while ((n = of_graph_get_next_endpoint(node, n)) != NULL) {
98 struct device_node *pn = of_graph_get_remote_port_parent(n);
99
100 if (!pn)
101 continue;
102
103 if (!of_device_is_available(pn) || omapdss_list_contains(pn)) {
104 of_node_put(pn);
105 continue;
106 }
107
108 omapdss_walk_device(dev, pn, false);
109 }
110 }
111
omapdss_gather_components(struct device * dev)112 void omapdss_gather_components(struct device *dev)
113 {
114 struct device_node *child;
115
116 INIT_LIST_HEAD(&omapdss_comp_list);
117
118 omapdss_walk_device(dev, dev->of_node, true);
119
120 for_each_available_child_of_node(dev->of_node, child) {
121 if (!of_find_property(child, "compatible", NULL))
122 continue;
123
124 omapdss_walk_device(dev, child, true);
125 }
126 }
127 EXPORT_SYMBOL(omapdss_gather_components);
128
omapdss_component_is_loaded(struct omapdss_comp_node * comp)129 static bool omapdss_component_is_loaded(struct omapdss_comp_node *comp)
130 {
131 if (comp->dss_core_component)
132 return true;
133 if (omapdss_component_is_display(comp->node))
134 return true;
135 if (omapdss_component_is_output(comp->node))
136 return true;
137
138 return false;
139 }
140
omapdss_stack_is_ready(void)141 bool omapdss_stack_is_ready(void)
142 {
143 struct omapdss_comp_node *comp;
144
145 list_for_each_entry(comp, &omapdss_comp_list, list) {
146 if (!omapdss_component_is_loaded(comp))
147 return false;
148 }
149
150 return true;
151 }
152 EXPORT_SYMBOL(omapdss_stack_is_ready);
153
154 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
155 MODULE_DESCRIPTION("OMAP Display Subsystem Base");
156 MODULE_LICENSE("GPL v2");
157
