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
 30struct arcpgu_drm_connector {
 31	struct drm_connector connector;
 32	struct drm_encoder_slave *encoder_slave;
 33};
 34
 35static 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
 44static void arcpgu_drm_connector_destroy(struct drm_connector *connector)
 45{
 46	drm_connector_unregister(connector);
 47	drm_connector_cleanup(connector);
 48}
 49
 50static const struct drm_connector_helper_funcs
 51arcpgu_drm_connector_helper_funcs = {
 52	.get_modes = arcpgu_drm_connector_get_modes,
 53};
 54
 55static const struct drm_connector_funcs arcpgu_drm_connector_funcs = {
 56	.dpms = drm_helper_connector_dpms,
 57	.reset = drm_atomic_helper_connector_reset,
 58	.fill_modes = drm_helper_probe_single_connector_modes,
 59	.destroy = arcpgu_drm_connector_destroy,
 60	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 61	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 62};
 63
 64static struct drm_encoder_funcs arcpgu_drm_encoder_funcs = {
 65	.destroy = drm_encoder_cleanup,
 66};
 67
 68int arcpgu_drm_sim_init(struct drm_device *drm, struct device_node *np)
 69{
 70	struct arcpgu_drm_connector *arcpgu_connector;
 71	struct drm_encoder_slave *encoder;
 72	struct drm_connector *connector;
 73	int ret;
 74
 75	encoder = devm_kzalloc(drm->dev, sizeof(*encoder), GFP_KERNEL);
 76	if (encoder == NULL)
 77		return -ENOMEM;
 78
 79	encoder->base.possible_crtcs = 1;
 80	encoder->base.possible_clones = 0;
 81
 82	ret = drm_encoder_init(drm, &encoder->base, &arcpgu_drm_encoder_funcs,
 83			       DRM_MODE_ENCODER_VIRTUAL, NULL);
 84	if (ret)
 85		return ret;
 86
 87	arcpgu_connector = devm_kzalloc(drm->dev, sizeof(*arcpgu_connector),
 88					GFP_KERNEL);
 89	if (!arcpgu_connector) {
 90		ret = -ENOMEM;
 91		goto error_encoder_cleanup;
 92	}
 93
 94	connector = &arcpgu_connector->connector;
 95	drm_connector_helper_add(connector, &arcpgu_drm_connector_helper_funcs);
 96
 97	ret = drm_connector_init(drm, connector, &arcpgu_drm_connector_funcs,
 98			DRM_MODE_CONNECTOR_VIRTUAL);
 99	if (ret < 0) {
100		dev_err(drm->dev, "failed to initialize drm connector\n");
101		goto error_encoder_cleanup;
102	}
103
104	ret = drm_mode_connector_attach_encoder(connector, &encoder->base);
105	if (ret < 0) {
106		dev_err(drm->dev, "could not attach connector to encoder\n");
107		drm_connector_unregister(connector);
108		goto error_connector_cleanup;
109	}
110
111	arcpgu_connector->encoder_slave = encoder;
112
113	return 0;
114
115error_connector_cleanup:
116	drm_connector_cleanup(connector);
117
118error_encoder_cleanup:
119	drm_encoder_cleanup(&encoder->base);
120	return ret;
121}