1 /*
2 * ARC PGU DRM driver.
3 *
4 * Copyright (C) 2016 Synopsys, Inc. (www.synopsys.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,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 */
16
17 #include <drm/drm_crtc_helper.h>
18 #include <drm/drm_encoder_slave.h>
19 #include <drm/drm_atomic_helper.h>
20
21 #include "arcpgu.h"
22
23 #define XRES_DEF 640
24 #define YRES_DEF 480
25
26 #define XRES_MAX 8192
27 #define YRES_MAX 8192
28
29
30 struct arcpgu_drm_connector {
31 struct drm_connector connector;
32 struct drm_encoder_slave *encoder_slave;
33 };
34
arcpgu_drm_connector_get_modes(struct drm_connector * connector)35 static int arcpgu_drm_connector_get_modes(struct drm_connector *connector)
36 {
37 int count;
38
39 count = drm_add_modes_noedid(connector, XRES_MAX, YRES_MAX);
40 drm_set_preferred_mode(connector, XRES_DEF, YRES_DEF);
41 return count;
42 }
43
44 static enum drm_connector_status
arcpgu_drm_connector_detect(struct drm_connector * connector,bool force)45 arcpgu_drm_connector_detect(struct drm_connector *connector, bool force)
46 {
47 return connector_status_connected;
48 }
49
arcpgu_drm_connector_destroy(struct drm_connector * connector)50 static void arcpgu_drm_connector_destroy(struct drm_connector *connector)
51 {
52 drm_connector_unregister(connector);
53 drm_connector_cleanup(connector);
54 }
55
56 static const struct drm_connector_helper_funcs
57 arcpgu_drm_connector_helper_funcs = {
58 .get_modes = arcpgu_drm_connector_get_modes,
59 };
60
61 static const struct drm_connector_funcs arcpgu_drm_connector_funcs = {
62 .dpms = drm_helper_connector_dpms,
63 .reset = drm_atomic_helper_connector_reset,
64 .detect = arcpgu_drm_connector_detect,
65 .fill_modes = drm_helper_probe_single_connector_modes,
66 .destroy = arcpgu_drm_connector_destroy,
67 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
68 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
69 };
70
71 static struct drm_encoder_funcs arcpgu_drm_encoder_funcs = {
72 .destroy = drm_encoder_cleanup,
73 };
74
arcpgu_drm_sim_init(struct drm_device * drm,struct device_node * np)75 int arcpgu_drm_sim_init(struct drm_device *drm, struct device_node *np)
76 {
77 struct arcpgu_drm_connector *arcpgu_connector;
78 struct drm_encoder_slave *encoder;
79 struct drm_connector *connector;
80 int ret;
81
82 encoder = devm_kzalloc(drm->dev, sizeof(*encoder), GFP_KERNEL);
83 if (encoder == NULL)
84 return -ENOMEM;
85
86 encoder->base.possible_crtcs = 1;
87 encoder->base.possible_clones = 0;
88
89 ret = drm_encoder_init(drm, &encoder->base, &arcpgu_drm_encoder_funcs,
90 DRM_MODE_ENCODER_VIRTUAL, NULL);
91 if (ret)
92 return ret;
93
94 arcpgu_connector = devm_kzalloc(drm->dev, sizeof(*arcpgu_connector),
95 GFP_KERNEL);
96 if (!arcpgu_connector) {
97 ret = -ENOMEM;
98 goto error_encoder_cleanup;
99 }
100
101 connector = &arcpgu_connector->connector;
102 drm_connector_helper_add(connector, &arcpgu_drm_connector_helper_funcs);
103
104 ret = drm_connector_init(drm, connector, &arcpgu_drm_connector_funcs,
105 DRM_MODE_CONNECTOR_VIRTUAL);
106 if (ret < 0) {
107 dev_err(drm->dev, "failed to initialize drm connector\n");
108 goto error_encoder_cleanup;
109 }
110
111 ret = drm_mode_connector_attach_encoder(connector, &encoder->base);
112 if (ret < 0) {
113 dev_err(drm->dev, "could not attach connector to encoder\n");
114 drm_connector_unregister(connector);
115 goto error_connector_cleanup;
116 }
117
118 arcpgu_connector->encoder_slave = encoder;
119
120 return 0;
121
122 error_connector_cleanup:
123 drm_connector_cleanup(connector);
124
125 error_encoder_cleanup:
126 drm_encoder_cleanup(&encoder->base);
127 return ret;
128 }
129