1/*
2 * Copyright (C) 2014 Traphandler
3 * Copyright (C) 2014 Free Electrons
4 * Copyright (C) 2014 Atmel
5 *
6 * Author: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
7 * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License version 2 as published by
11 * the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful, but WITHOUT
14 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
16 * more details.
17 *
18 * You should have received a copy of the GNU General Public License along with
19 * this program.  If not, see <http://www.gnu.org/licenses/>.
20 */
21
22#include <linux/of_graph.h>
23
24#include <drm/drmP.h>
25#include <drm/drm_panel.h>
26
27#include "atmel_hlcdc_dc.h"
28
29/**
30 * Atmel HLCDC RGB output mode
31 */
32enum atmel_hlcdc_connector_rgb_mode {
33	ATMEL_HLCDC_CONNECTOR_RGB444,
34	ATMEL_HLCDC_CONNECTOR_RGB565,
35	ATMEL_HLCDC_CONNECTOR_RGB666,
36	ATMEL_HLCDC_CONNECTOR_RGB888,
37};
38
39/**
40 * Atmel HLCDC RGB connector structure
41 *
42 * This structure stores RGB slave device information.
43 *
44 * @connector: DRM connector
45 * @encoder: DRM encoder
46 * @dc: pointer to the atmel_hlcdc_dc structure
47 * @dpms: current DPMS mode
48 */
49struct atmel_hlcdc_rgb_output {
50	struct drm_connector connector;
51	struct drm_encoder encoder;
52	struct atmel_hlcdc_dc *dc;
53	int dpms;
54};
55
56static inline struct atmel_hlcdc_rgb_output *
57drm_connector_to_atmel_hlcdc_rgb_output(struct drm_connector *connector)
58{
59	return container_of(connector, struct atmel_hlcdc_rgb_output,
60			    connector);
61}
62
63static inline struct atmel_hlcdc_rgb_output *
64drm_encoder_to_atmel_hlcdc_rgb_output(struct drm_encoder *encoder)
65{
66	return container_of(encoder, struct atmel_hlcdc_rgb_output, encoder);
67}
68
69/**
70 * Atmel HLCDC Panel device structure
71 *
72 * This structure is specialization of the slave device structure to
73 * interface with drm panels.
74 *
75 * @base: base slave device fields
76 * @panel: drm panel attached to this slave device
77 */
78struct atmel_hlcdc_panel {
79	struct atmel_hlcdc_rgb_output base;
80	struct drm_panel *panel;
81};
82
83static inline struct atmel_hlcdc_panel *
84atmel_hlcdc_rgb_output_to_panel(struct atmel_hlcdc_rgb_output *output)
85{
86	return container_of(output, struct atmel_hlcdc_panel, base);
87}
88
89static void atmel_hlcdc_panel_encoder_enable(struct drm_encoder *encoder)
90{
91	struct atmel_hlcdc_rgb_output *rgb =
92			drm_encoder_to_atmel_hlcdc_rgb_output(encoder);
93	struct atmel_hlcdc_panel *panel = atmel_hlcdc_rgb_output_to_panel(rgb);
94
95	drm_panel_enable(panel->panel);
96}
97
98static void atmel_hlcdc_panel_encoder_disable(struct drm_encoder *encoder)
99{
100	struct atmel_hlcdc_rgb_output *rgb =
101			drm_encoder_to_atmel_hlcdc_rgb_output(encoder);
102	struct atmel_hlcdc_panel *panel = atmel_hlcdc_rgb_output_to_panel(rgb);
103
104	drm_panel_disable(panel->panel);
105}
106
107static bool
108atmel_hlcdc_panel_encoder_mode_fixup(struct drm_encoder *encoder,
109				     const struct drm_display_mode *mode,
110				     struct drm_display_mode *adjusted)
111{
112	return true;
113}
114
115static void
116atmel_hlcdc_rgb_encoder_mode_set(struct drm_encoder *encoder,
117				 struct drm_display_mode *mode,
118				 struct drm_display_mode *adjusted)
119{
120	struct atmel_hlcdc_rgb_output *rgb =
121			drm_encoder_to_atmel_hlcdc_rgb_output(encoder);
122	struct drm_display_info *info = &rgb->connector.display_info;
123	unsigned int cfg;
124
125	cfg = 0;
126
127	if (info->num_bus_formats) {
128		switch (info->bus_formats[0]) {
129		case MEDIA_BUS_FMT_RGB565_1X16:
130			cfg |= ATMEL_HLCDC_CONNECTOR_RGB565 << 8;
131			break;
132		case MEDIA_BUS_FMT_RGB666_1X18:
133			cfg |= ATMEL_HLCDC_CONNECTOR_RGB666 << 8;
134			break;
135		case MEDIA_BUS_FMT_RGB888_1X24:
136			cfg |= ATMEL_HLCDC_CONNECTOR_RGB888 << 8;
137			break;
138		case MEDIA_BUS_FMT_RGB444_1X12:
139		default:
140			break;
141		}
142	}
143
144	regmap_update_bits(rgb->dc->hlcdc->regmap, ATMEL_HLCDC_CFG(5),
145			   ATMEL_HLCDC_MODE_MASK,
146			   cfg);
147}
148
149static struct drm_encoder_helper_funcs atmel_hlcdc_panel_encoder_helper_funcs = {
150	.mode_fixup = atmel_hlcdc_panel_encoder_mode_fixup,
151	.mode_set = atmel_hlcdc_rgb_encoder_mode_set,
152	.disable = atmel_hlcdc_panel_encoder_disable,
153	.enable = atmel_hlcdc_panel_encoder_enable,
154};
155
156static void atmel_hlcdc_rgb_encoder_destroy(struct drm_encoder *encoder)
157{
158	drm_encoder_cleanup(encoder);
159	memset(encoder, 0, sizeof(*encoder));
160}
161
162static const struct drm_encoder_funcs atmel_hlcdc_panel_encoder_funcs = {
163	.destroy = atmel_hlcdc_rgb_encoder_destroy,
164};
165
166static int atmel_hlcdc_panel_get_modes(struct drm_connector *connector)
167{
168	struct atmel_hlcdc_rgb_output *rgb =
169			drm_connector_to_atmel_hlcdc_rgb_output(connector);
170	struct atmel_hlcdc_panel *panel = atmel_hlcdc_rgb_output_to_panel(rgb);
171
172	return panel->panel->funcs->get_modes(panel->panel);
173}
174
175static int atmel_hlcdc_rgb_mode_valid(struct drm_connector *connector,
176				      struct drm_display_mode *mode)
177{
178	struct atmel_hlcdc_rgb_output *rgb =
179			drm_connector_to_atmel_hlcdc_rgb_output(connector);
180
181	return atmel_hlcdc_dc_mode_valid(rgb->dc, mode);
182}
183
184
185
186static struct drm_encoder *
187atmel_hlcdc_rgb_best_encoder(struct drm_connector *connector)
188{
189	struct atmel_hlcdc_rgb_output *rgb =
190			drm_connector_to_atmel_hlcdc_rgb_output(connector);
191
192	return &rgb->encoder;
193}
194
195static struct drm_connector_helper_funcs atmel_hlcdc_panel_connector_helper_funcs = {
196	.get_modes = atmel_hlcdc_panel_get_modes,
197	.mode_valid = atmel_hlcdc_rgb_mode_valid,
198	.best_encoder = atmel_hlcdc_rgb_best_encoder,
199};
200
201static enum drm_connector_status
202atmel_hlcdc_panel_connector_detect(struct drm_connector *connector, bool force)
203{
204	return connector_status_connected;
205}
206
207static void
208atmel_hlcdc_panel_connector_destroy(struct drm_connector *connector)
209{
210	struct atmel_hlcdc_rgb_output *rgb =
211			drm_connector_to_atmel_hlcdc_rgb_output(connector);
212	struct atmel_hlcdc_panel *panel = atmel_hlcdc_rgb_output_to_panel(rgb);
213
214	drm_panel_detach(panel->panel);
215	drm_connector_cleanup(connector);
216}
217
218static const struct drm_connector_funcs atmel_hlcdc_panel_connector_funcs = {
219	.dpms = drm_atomic_helper_connector_dpms,
220	.detect = atmel_hlcdc_panel_connector_detect,
221	.fill_modes = drm_helper_probe_single_connector_modes,
222	.destroy = atmel_hlcdc_panel_connector_destroy,
223	.reset = drm_atomic_helper_connector_reset,
224	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
225	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
226};
227
228static int atmel_hlcdc_create_panel_output(struct drm_device *dev,
229					   struct of_endpoint *ep)
230{
231	struct atmel_hlcdc_dc *dc = dev->dev_private;
232	struct device_node *np;
233	struct drm_panel *p = NULL;
234	struct atmel_hlcdc_panel *panel;
235	int ret;
236
237	np = of_graph_get_remote_port_parent(ep->local_node);
238	if (!np)
239		return -EINVAL;
240
241	p = of_drm_find_panel(np);
242	of_node_put(np);
243
244	if (!p)
245		return -EPROBE_DEFER;
246
247	panel = devm_kzalloc(dev->dev, sizeof(*panel), GFP_KERNEL);
248	if (!panel)
249		return -EINVAL;
250
251	panel->base.dpms = DRM_MODE_DPMS_OFF;
252
253	panel->base.dc = dc;
254
255	drm_encoder_helper_add(&panel->base.encoder,
256			       &atmel_hlcdc_panel_encoder_helper_funcs);
257	ret = drm_encoder_init(dev, &panel->base.encoder,
258			       &atmel_hlcdc_panel_encoder_funcs,
259			       DRM_MODE_ENCODER_LVDS);
260	if (ret)
261		return ret;
262
263	panel->base.connector.dpms = DRM_MODE_DPMS_OFF;
264	panel->base.connector.polled = DRM_CONNECTOR_POLL_CONNECT;
265	drm_connector_helper_add(&panel->base.connector,
266				 &atmel_hlcdc_panel_connector_helper_funcs);
267	ret = drm_connector_init(dev, &panel->base.connector,
268				 &atmel_hlcdc_panel_connector_funcs,
269				 DRM_MODE_CONNECTOR_LVDS);
270	if (ret)
271		goto err_encoder_cleanup;
272
273	drm_mode_connector_attach_encoder(&panel->base.connector,
274					  &panel->base.encoder);
275	panel->base.encoder.possible_crtcs = 0x1;
276
277	drm_panel_attach(p, &panel->base.connector);
278	panel->panel = p;
279
280	return 0;
281
282err_encoder_cleanup:
283	drm_encoder_cleanup(&panel->base.encoder);
284
285	return ret;
286}
287
288int atmel_hlcdc_create_outputs(struct drm_device *dev)
289{
290	struct device_node *port_np, *np;
291	struct of_endpoint ep;
292	int ret;
293
294	port_np = of_get_child_by_name(dev->dev->of_node, "port");
295	if (!port_np)
296		return -EINVAL;
297
298	np = of_get_child_by_name(port_np, "endpoint");
299	of_node_put(port_np);
300
301	if (!np)
302		return -EINVAL;
303
304	ret = of_graph_parse_endpoint(np, &ep);
305	of_node_put(port_np);
306
307	if (ret)
308		return ret;
309
310	/* We currently only support panel output */
311	return atmel_hlcdc_create_panel_output(dev, &ep);
312}
313