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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
25static struct dss_device *dss_device;
26
27static struct list_head omapdss_comp_list;
28
29struct omapdss_comp_node {
30 struct list_head list;
31 struct device_node *node;
32 bool dss_core_component;
33};
34
35struct dss_device *omapdss_get_dss(void)
36{
37 return dss_device;
38}
39EXPORT_SYMBOL(omapdss_get_dss);
40
41void omapdss_set_dss(struct dss_device *dss)
42{
43 dss_device = dss;
44}
45EXPORT_SYMBOL(omapdss_set_dss);
46
47struct dispc_device *dispc_get_dispc(struct dss_device *dss)
48{
49 return dss->dispc;
50}
51EXPORT_SYMBOL(dispc_get_dispc);
52
53const struct dispc_ops *dispc_get_ops(struct dss_device *dss)
54{
55 return dss->dispc_ops;
56}
57EXPORT_SYMBOL(dispc_get_ops);
58
59static 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
71static 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
112void 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}
127EXPORT_SYMBOL(omapdss_gather_components);
128
129static 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
141bool 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}
152EXPORT_SYMBOL(omapdss_stack_is_ready);
153
154MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
155MODULE_DESCRIPTION("OMAP Display Subsystem Base");
156MODULE_LICENSE("GPL v2");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * OMAP Display Subsystem Base
4 *
5 * Copyright (C) 2015-2017 Texas Instruments Incorporated - http://www.ti.com/
6 */
7
8#include <linux/kernel.h>
9#include <linux/list.h>
10#include <linux/module.h>
11#include <linux/mutex.h>
12#include <linux/of.h>
13#include <linux/of_graph.h>
14#include <linux/platform_device.h>
15
16#include "dss.h"
17#include "omapdss.h"
18
19static struct dss_device *dss_device;
20
21struct dss_device *omapdss_get_dss(void)
22{
23 return dss_device;
24}
25EXPORT_SYMBOL(omapdss_get_dss);
26
27void omapdss_set_dss(struct dss_device *dss)
28{
29 dss_device = dss;
30}
31EXPORT_SYMBOL(omapdss_set_dss);
32
33struct dispc_device *dispc_get_dispc(struct dss_device *dss)
34{
35 return dss->dispc;
36}
37EXPORT_SYMBOL(dispc_get_dispc);
38
39const struct dispc_ops *dispc_get_ops(struct dss_device *dss)
40{
41 return dss->dispc_ops;
42}
43EXPORT_SYMBOL(dispc_get_ops);
44
45
46/* -----------------------------------------------------------------------------
47 * OMAP DSS Devices Handling
48 */
49
50static LIST_HEAD(omapdss_devices_list);
51static DEFINE_MUTEX(omapdss_devices_lock);
52
53void omapdss_device_register(struct omap_dss_device *dssdev)
54{
55 mutex_lock(&omapdss_devices_lock);
56 list_add_tail(&dssdev->list, &omapdss_devices_list);
57 mutex_unlock(&omapdss_devices_lock);
58}
59EXPORT_SYMBOL_GPL(omapdss_device_register);
60
61void omapdss_device_unregister(struct omap_dss_device *dssdev)
62{
63 mutex_lock(&omapdss_devices_lock);
64 list_del(&dssdev->list);
65 mutex_unlock(&omapdss_devices_lock);
66}
67EXPORT_SYMBOL_GPL(omapdss_device_unregister);
68
69static bool omapdss_device_is_registered(struct device_node *node)
70{
71 struct omap_dss_device *dssdev;
72 bool found = false;
73
74 mutex_lock(&omapdss_devices_lock);
75
76 list_for_each_entry(dssdev, &omapdss_devices_list, list) {
77 if (dssdev->dev->of_node == node) {
78 found = true;
79 break;
80 }
81 }
82
83 mutex_unlock(&omapdss_devices_lock);
84 return found;
85}
86
87struct omap_dss_device *omapdss_device_get(struct omap_dss_device *dssdev)
88{
89 if (!try_module_get(dssdev->owner))
90 return NULL;
91
92 if (get_device(dssdev->dev) == NULL) {
93 module_put(dssdev->owner);
94 return NULL;
95 }
96
97 return dssdev;
98}
99EXPORT_SYMBOL(omapdss_device_get);
100
101void omapdss_device_put(struct omap_dss_device *dssdev)
102{
103 put_device(dssdev->dev);
104 module_put(dssdev->owner);
105}
106EXPORT_SYMBOL(omapdss_device_put);
107
108struct omap_dss_device *omapdss_find_device_by_node(struct device_node *node)
109{
110 struct omap_dss_device *dssdev;
111
112 list_for_each_entry(dssdev, &omapdss_devices_list, list) {
113 if (dssdev->dev->of_node == node)
114 return omapdss_device_get(dssdev);
115 }
116
117 return NULL;
118}
119
120/*
121 * Search for the next output device starting at @from. Release the reference to
122 * the @from device, and acquire a reference to the returned device if found.
123 */
124struct omap_dss_device *omapdss_device_next_output(struct omap_dss_device *from)
125{
126 struct omap_dss_device *dssdev;
127 struct list_head *list;
128
129 mutex_lock(&omapdss_devices_lock);
130
131 if (list_empty(&omapdss_devices_list)) {
132 dssdev = NULL;
133 goto done;
134 }
135
136 /*
137 * Start from the from entry if given or from omapdss_devices_list
138 * otherwise.
139 */
140 list = from ? &from->list : &omapdss_devices_list;
141
142 list_for_each_entry(dssdev, list, list) {
143 /*
144 * Stop if we reach the omapdss_devices_list, that's the end of
145 * the list.
146 */
147 if (&dssdev->list == &omapdss_devices_list) {
148 dssdev = NULL;
149 goto done;
150 }
151
152 if (dssdev->id && (dssdev->next || dssdev->bridge))
153 goto done;
154 }
155
156 dssdev = NULL;
157
158done:
159 if (from)
160 omapdss_device_put(from);
161 if (dssdev)
162 omapdss_device_get(dssdev);
163
164 mutex_unlock(&omapdss_devices_lock);
165 return dssdev;
166}
167EXPORT_SYMBOL(omapdss_device_next_output);
168
169static bool omapdss_device_is_connected(struct omap_dss_device *dssdev)
170{
171 return dssdev->dss;
172}
173
174int omapdss_device_connect(struct dss_device *dss,
175 struct omap_dss_device *src,
176 struct omap_dss_device *dst)
177{
178 int ret;
179
180 dev_dbg(&dss->pdev->dev, "connect(%s, %s)\n",
181 src ? dev_name(src->dev) : "NULL",
182 dst ? dev_name(dst->dev) : "NULL");
183
184 if (!dst) {
185 /*
186 * The destination is NULL when the source is connected to a
187 * bridge instead of a DSS device. Stop here, we will attach
188 * the bridge later when we will have a DRM encoder.
189 */
190 return src && src->bridge ? 0 : -EINVAL;
191 }
192
193 if (omapdss_device_is_connected(dst))
194 return -EBUSY;
195
196 dst->dss = dss;
197
198 if (dst->ops && dst->ops->connect) {
199 ret = dst->ops->connect(src, dst);
200 if (ret < 0) {
201 dst->dss = NULL;
202 return ret;
203 }
204 }
205
206 return 0;
207}
208EXPORT_SYMBOL_GPL(omapdss_device_connect);
209
210void omapdss_device_disconnect(struct omap_dss_device *src,
211 struct omap_dss_device *dst)
212{
213 struct dss_device *dss = src ? src->dss : dst->dss;
214
215 dev_dbg(&dss->pdev->dev, "disconnect(%s, %s)\n",
216 src ? dev_name(src->dev) : "NULL",
217 dst ? dev_name(dst->dev) : "NULL");
218
219 if (!dst) {
220 WARN_ON(!src->bridge);
221 return;
222 }
223
224 if (!dst->id && !omapdss_device_is_connected(dst)) {
225 WARN_ON(!dst->display);
226 return;
227 }
228
229 WARN_ON(dst->state != OMAP_DSS_DISPLAY_DISABLED);
230
231 if (dst->ops && dst->ops->disconnect)
232 dst->ops->disconnect(src, dst);
233 dst->dss = NULL;
234}
235EXPORT_SYMBOL_GPL(omapdss_device_disconnect);
236
237void omapdss_device_enable(struct omap_dss_device *dssdev)
238{
239 if (!dssdev)
240 return;
241
242 if (dssdev->ops && dssdev->ops->enable)
243 dssdev->ops->enable(dssdev);
244
245 omapdss_device_enable(dssdev->next);
246
247 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
248}
249EXPORT_SYMBOL_GPL(omapdss_device_enable);
250
251void omapdss_device_disable(struct omap_dss_device *dssdev)
252{
253 if (!dssdev)
254 return;
255
256 omapdss_device_disable(dssdev->next);
257
258 if (dssdev->ops && dssdev->ops->disable)
259 dssdev->ops->disable(dssdev);
260}
261EXPORT_SYMBOL_GPL(omapdss_device_disable);
262
263/* -----------------------------------------------------------------------------
264 * Components Handling
265 */
266
267static struct list_head omapdss_comp_list;
268
269struct omapdss_comp_node {
270 struct list_head list;
271 struct device_node *node;
272 bool dss_core_component;
273 const char *compat;
274};
275
276static bool omapdss_list_contains(const struct device_node *node)
277{
278 struct omapdss_comp_node *comp;
279
280 list_for_each_entry(comp, &omapdss_comp_list, list) {
281 if (comp->node == node)
282 return true;
283 }
284
285 return false;
286}
287
288static void omapdss_walk_device(struct device *dev, struct device_node *node,
289 bool dss_core)
290{
291 struct omapdss_comp_node *comp;
292 struct device_node *n;
293 const char *compat;
294 int ret;
295
296 ret = of_property_read_string(node, "compatible", &compat);
297 if (ret < 0)
298 return;
299
300 comp = devm_kzalloc(dev, sizeof(*comp), GFP_KERNEL);
301 if (comp) {
302 comp->node = node;
303 comp->dss_core_component = dss_core;
304 comp->compat = compat;
305 list_add(&comp->list, &omapdss_comp_list);
306 }
307
308 /*
309 * of_graph_get_remote_port_parent() prints an error if there is no
310 * port/ports node. To avoid that, check first that there's the node.
311 */
312 n = of_get_child_by_name(node, "ports");
313 if (!n)
314 n = of_get_child_by_name(node, "port");
315 if (!n)
316 return;
317
318 of_node_put(n);
319
320 n = NULL;
321 while ((n = of_graph_get_next_endpoint(node, n)) != NULL) {
322 struct device_node *pn = of_graph_get_remote_port_parent(n);
323
324 if (!pn)
325 continue;
326
327 if (!of_device_is_available(pn) || omapdss_list_contains(pn)) {
328 of_node_put(pn);
329 continue;
330 }
331
332 omapdss_walk_device(dev, pn, false);
333 }
334}
335
336void omapdss_gather_components(struct device *dev)
337{
338 struct device_node *child;
339
340 INIT_LIST_HEAD(&omapdss_comp_list);
341
342 omapdss_walk_device(dev, dev->of_node, true);
343
344 for_each_available_child_of_node(dev->of_node, child)
345 omapdss_walk_device(dev, child, true);
346}
347EXPORT_SYMBOL(omapdss_gather_components);
348
349static bool omapdss_component_is_loaded(struct omapdss_comp_node *comp)
350{
351 if (comp->dss_core_component)
352 return true;
353 if (!strstarts(comp->compat, "omapdss,"))
354 return true;
355 if (omapdss_device_is_registered(comp->node))
356 return true;
357
358 return false;
359}
360
361bool omapdss_stack_is_ready(void)
362{
363 struct omapdss_comp_node *comp;
364
365 list_for_each_entry(comp, &omapdss_comp_list, list) {
366 if (!omapdss_component_is_loaded(comp))
367 return false;
368 }
369
370 return true;
371}
372EXPORT_SYMBOL(omapdss_stack_is_ready);
373
374MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
375MODULE_DESCRIPTION("OMAP Display Subsystem Base");
376MODULE_LICENSE("GPL v2");