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_atomic_helper.h>
 19
 20#include "arcpgu.h"
 21
 22#define XRES_DEF	640
 23#define YRES_DEF	480
 24
 25#define XRES_MAX	8192
 26#define YRES_MAX	8192
 27
 28
 29struct arcpgu_drm_connector {
 30	struct drm_connector connector;
 31};
 32
 33static int arcpgu_drm_connector_get_modes(struct drm_connector *connector)
 34{
 35	int count;
 36
 37	count = drm_add_modes_noedid(connector, XRES_MAX, YRES_MAX);
 38	drm_set_preferred_mode(connector, XRES_DEF, YRES_DEF);
 39	return count;
 40}
 41
 42static void arcpgu_drm_connector_destroy(struct drm_connector *connector)
 43{
 44	drm_connector_unregister(connector);
 45	drm_connector_cleanup(connector);
 46}
 47
 48static const struct drm_connector_helper_funcs
 49arcpgu_drm_connector_helper_funcs = {
 50	.get_modes = arcpgu_drm_connector_get_modes,
 51};
 52
 53static const struct drm_connector_funcs arcpgu_drm_connector_funcs = {
 54	.dpms = drm_helper_connector_dpms,
 55	.reset = drm_atomic_helper_connector_reset,
 56	.fill_modes = drm_helper_probe_single_connector_modes,
 57	.destroy = arcpgu_drm_connector_destroy,
 58	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 59	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 60};
 61
 62static struct drm_encoder_funcs arcpgu_drm_encoder_funcs = {
 63	.destroy = drm_encoder_cleanup,
 64};
 65
 66int arcpgu_drm_sim_init(struct drm_device *drm, struct device_node *np)
 67{
 68	struct arcpgu_drm_connector *arcpgu_connector;
 69	struct drm_encoder *encoder;
 70	struct drm_connector *connector;
 71	int ret;
 72
 73	encoder = devm_kzalloc(drm->dev, sizeof(*encoder), GFP_KERNEL);
 74	if (encoder == NULL)
 75		return -ENOMEM;
 76
 77	encoder->possible_crtcs = 1;
 78	encoder->possible_clones = 0;
 79
 80	ret = drm_encoder_init(drm, encoder, &arcpgu_drm_encoder_funcs,
 81			       DRM_MODE_ENCODER_VIRTUAL, NULL);
 82	if (ret)
 83		return ret;
 84
 85	arcpgu_connector = devm_kzalloc(drm->dev, sizeof(*arcpgu_connector),
 86					GFP_KERNEL);
 87	if (!arcpgu_connector) {
 88		ret = -ENOMEM;
 89		goto error_encoder_cleanup;
 90	}
 91
 92	connector = &arcpgu_connector->connector;
 93	drm_connector_helper_add(connector, &arcpgu_drm_connector_helper_funcs);
 94
 95	ret = drm_connector_init(drm, connector, &arcpgu_drm_connector_funcs,
 96			DRM_MODE_CONNECTOR_VIRTUAL);
 97	if (ret < 0) {
 98		dev_err(drm->dev, "failed to initialize drm connector\n");
 99		goto error_encoder_cleanup;
100	}
101
102	ret = drm_mode_connector_attach_encoder(connector, encoder);
103	if (ret < 0) {
104		dev_err(drm->dev, "could not attach connector to encoder\n");
105		drm_connector_unregister(connector);
106		goto error_connector_cleanup;
107	}
108
109	return 0;
110
111error_connector_cleanup:
112	drm_connector_cleanup(connector);
113
114error_encoder_cleanup:
115	drm_encoder_cleanup(encoder);
116	return ret;
117}