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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 &&
153 (dssdev->next || dssdev->bridge || dssdev->panel))
154 goto done;
155 }
156
157 dssdev = NULL;
158
159done:
160 if (from)
161 omapdss_device_put(from);
162 if (dssdev)
163 omapdss_device_get(dssdev);
164
165 mutex_unlock(&omapdss_devices_lock);
166 return dssdev;
167}
168EXPORT_SYMBOL(omapdss_device_next_output);
169
170static bool omapdss_device_is_connected(struct omap_dss_device *dssdev)
171{
172 return dssdev->dss;
173}
174
175int omapdss_device_connect(struct dss_device *dss,
176 struct omap_dss_device *src,
177 struct omap_dss_device *dst)
178{
179 int ret;
180
181 dev_dbg(&dss->pdev->dev, "connect(%s, %s)\n",
182 src ? dev_name(src->dev) : "NULL",
183 dst ? dev_name(dst->dev) : "NULL");
184
185 if (!dst) {
186 /*
187 * The destination is NULL when the source is connected to a
188 * bridge or panel instead of a DSS device. Stop here, we will
189 * attach the bridge or panel later when we will have a DRM
190 * encoder.
191 */
192 return src && (src->bridge || src->panel) ? 0 : -EINVAL;
193 }
194
195 if (omapdss_device_is_connected(dst))
196 return -EBUSY;
197
198 dst->dss = dss;
199
200 ret = dst->ops->connect(src, dst);
201 if (ret < 0) {
202 dst->dss = NULL;
203 return ret;
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 && !src->panel);
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 dst->ops->disconnect(src, dst);
232 dst->dss = NULL;
233}
234EXPORT_SYMBOL_GPL(omapdss_device_disconnect);
235
236void omapdss_device_pre_enable(struct omap_dss_device *dssdev)
237{
238 if (!dssdev)
239 return;
240
241 omapdss_device_pre_enable(dssdev->next);
242
243 if (dssdev->ops->pre_enable)
244 dssdev->ops->pre_enable(dssdev);
245}
246EXPORT_SYMBOL_GPL(omapdss_device_pre_enable);
247
248void omapdss_device_enable(struct omap_dss_device *dssdev)
249{
250 if (!dssdev)
251 return;
252
253 if (dssdev->ops->enable)
254 dssdev->ops->enable(dssdev);
255
256 omapdss_device_enable(dssdev->next);
257
258 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
259}
260EXPORT_SYMBOL_GPL(omapdss_device_enable);
261
262void omapdss_device_disable(struct omap_dss_device *dssdev)
263{
264 if (!dssdev)
265 return;
266
267 omapdss_device_disable(dssdev->next);
268
269 if (dssdev->ops->disable)
270 dssdev->ops->disable(dssdev);
271}
272EXPORT_SYMBOL_GPL(omapdss_device_disable);
273
274void omapdss_device_post_disable(struct omap_dss_device *dssdev)
275{
276 if (!dssdev)
277 return;
278
279 if (dssdev->ops->post_disable)
280 dssdev->ops->post_disable(dssdev);
281
282 omapdss_device_post_disable(dssdev->next);
283
284 dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
285}
286EXPORT_SYMBOL_GPL(omapdss_device_post_disable);
287
288/* -----------------------------------------------------------------------------
289 * Components Handling
290 */
291
292static struct list_head omapdss_comp_list;
293
294struct omapdss_comp_node {
295 struct list_head list;
296 struct device_node *node;
297 bool dss_core_component;
298 const char *compat;
299};
300
301static bool omapdss_list_contains(const struct device_node *node)
302{
303 struct omapdss_comp_node *comp;
304
305 list_for_each_entry(comp, &omapdss_comp_list, list) {
306 if (comp->node == node)
307 return true;
308 }
309
310 return false;
311}
312
313static void omapdss_walk_device(struct device *dev, struct device_node *node,
314 bool dss_core)
315{
316 struct omapdss_comp_node *comp;
317 struct device_node *n;
318 const char *compat;
319 int ret;
320
321 ret = of_property_read_string(node, "compatible", &compat);
322 if (ret < 0)
323 return;
324
325 comp = devm_kzalloc(dev, sizeof(*comp), GFP_KERNEL);
326 if (comp) {
327 comp->node = node;
328 comp->dss_core_component = dss_core;
329 comp->compat = compat;
330 list_add(&comp->list, &omapdss_comp_list);
331 }
332
333 /*
334 * of_graph_get_remote_port_parent() prints an error if there is no
335 * port/ports node. To avoid that, check first that there's the node.
336 */
337 n = of_get_child_by_name(node, "ports");
338 if (!n)
339 n = of_get_child_by_name(node, "port");
340 if (!n)
341 return;
342
343 of_node_put(n);
344
345 n = NULL;
346 while ((n = of_graph_get_next_endpoint(node, n)) != NULL) {
347 struct device_node *pn = of_graph_get_remote_port_parent(n);
348
349 if (!pn)
350 continue;
351
352 if (!of_device_is_available(pn) || omapdss_list_contains(pn)) {
353 of_node_put(pn);
354 continue;
355 }
356
357 omapdss_walk_device(dev, pn, false);
358 }
359}
360
361void omapdss_gather_components(struct device *dev)
362{
363 struct device_node *child;
364
365 INIT_LIST_HEAD(&omapdss_comp_list);
366
367 omapdss_walk_device(dev, dev->of_node, true);
368
369 for_each_available_child_of_node(dev->of_node, child)
370 omapdss_walk_device(dev, child, true);
371}
372EXPORT_SYMBOL(omapdss_gather_components);
373
374static bool omapdss_component_is_loaded(struct omapdss_comp_node *comp)
375{
376 if (comp->dss_core_component)
377 return true;
378 if (!strstarts(comp->compat, "omapdss,"))
379 return true;
380 if (omapdss_device_is_registered(comp->node))
381 return true;
382
383 return false;
384}
385
386bool omapdss_stack_is_ready(void)
387{
388 struct omapdss_comp_node *comp;
389
390 list_for_each_entry(comp, &omapdss_comp_list, list) {
391 if (!omapdss_component_is_loaded(comp))
392 return false;
393 }
394
395 return true;
396}
397EXPORT_SYMBOL(omapdss_stack_is_ready);
398
399MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
400MODULE_DESCRIPTION("OMAP Display Subsystem Base");
401MODULE_LICENSE("GPL v2");