1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * ARC PGU DRM driver.
4 *
5 * Copyright (C) 2016 Synopsys, Inc. (www.synopsys.com)
6 */
7
8#include <drm/drm_atomic_helper.h>
9#include <drm/drm_device.h>
10#include <drm/drm_probe_helper.h>
11
12#include "arcpgu.h"
13
14#define XRES_DEF	640
15#define YRES_DEF	480
16
17#define XRES_MAX	8192
18#define YRES_MAX	8192
19
20
21struct arcpgu_drm_connector {
22	struct drm_connector connector;
23};
24
25static int arcpgu_drm_connector_get_modes(struct drm_connector *connector)
26{
27	int count;
28
29	count = drm_add_modes_noedid(connector, XRES_MAX, YRES_MAX);
30	drm_set_preferred_mode(connector, XRES_DEF, YRES_DEF);
31	return count;
32}
33
34static void arcpgu_drm_connector_destroy(struct drm_connector *connector)
35{
36	drm_connector_unregister(connector);
37	drm_connector_cleanup(connector);
38}
39
40static const struct drm_connector_helper_funcs
41arcpgu_drm_connector_helper_funcs = {
42	.get_modes = arcpgu_drm_connector_get_modes,
43};
44
45static const struct drm_connector_funcs arcpgu_drm_connector_funcs = {
46	.reset = drm_atomic_helper_connector_reset,
47	.fill_modes = drm_helper_probe_single_connector_modes,
48	.destroy = arcpgu_drm_connector_destroy,
49	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
50	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
51};
52
53static struct drm_encoder_funcs arcpgu_drm_encoder_funcs = {
54	.destroy = drm_encoder_cleanup,
55};
56
57int arcpgu_drm_sim_init(struct drm_device *drm, struct device_node *np)
58{
59	struct arcpgu_drm_connector *arcpgu_connector;
60	struct drm_encoder *encoder;
61	struct drm_connector *connector;
62	int ret;
63
64	encoder = devm_kzalloc(drm->dev, sizeof(*encoder), GFP_KERNEL);
65	if (encoder == NULL)
66		return -ENOMEM;
67
68	encoder->possible_crtcs = 1;
69	encoder->possible_clones = 0;
70
71	ret = drm_encoder_init(drm, encoder, &arcpgu_drm_encoder_funcs,
72			       DRM_MODE_ENCODER_VIRTUAL, NULL);
73	if (ret)
74		return ret;
75
76	arcpgu_connector = devm_kzalloc(drm->dev, sizeof(*arcpgu_connector),
77					GFP_KERNEL);
78	if (!arcpgu_connector) {
79		ret = -ENOMEM;
80		goto error_encoder_cleanup;
81	}
82
83	connector = &arcpgu_connector->connector;
84	drm_connector_helper_add(connector, &arcpgu_drm_connector_helper_funcs);
85
86	ret = drm_connector_init(drm, connector, &arcpgu_drm_connector_funcs,
87			DRM_MODE_CONNECTOR_VIRTUAL);
88	if (ret < 0) {
89		dev_err(drm->dev, "failed to initialize drm connector\n");
90		goto error_encoder_cleanup;
91	}
92
93	ret = drm_connector_attach_encoder(connector, encoder);
94	if (ret < 0) {
95		dev_err(drm->dev, "could not attach connector to encoder\n");
96		drm_connector_unregister(connector);
97		goto error_connector_cleanup;
98	}
99
100	return 0;
101
102error_connector_cleanup:
103	drm_connector_cleanup(connector);
104
105error_encoder_cleanup:
106	drm_encoder_cleanup(encoder);
107	return ret;
108}
109