1/*
  2 * Copyright (C) 2015 Free Electrons
  3 * Copyright (C) 2015 NextThing Co
  4 *
  5 * Maxime Ripard <maxime.ripard@free-electrons.com>
  6 *
  7 * This program is free software; you can redistribute it and/or
  8 * modify it under the terms of the GNU General Public License as
  9 * published by the Free Software Foundation; either version 2 of
 10 * the License, or (at your option) any later version.
 11 */
 12
 13#include <linux/clk.h>
 14
 15#include <drm/drmP.h>
 16#include <drm/drm_atomic_helper.h>
 17#include <drm/drm_crtc_helper.h>
 18#include <drm/drm_panel.h>
 19
 20#include "sun4i_drv.h"
 21#include "sun4i_tcon.h"
 22#include "sun4i_rgb.h"
 23
 24struct sun4i_rgb {
 25	struct drm_connector	connector;
 26	struct drm_encoder	encoder;
 27
 28	struct sun4i_drv	*drv;
 29};
 30
 31static inline struct sun4i_rgb *
 32drm_connector_to_sun4i_rgb(struct drm_connector *connector)
 33{
 34	return container_of(connector, struct sun4i_rgb,
 35			    connector);
 36}
 37
 38static inline struct sun4i_rgb *
 39drm_encoder_to_sun4i_rgb(struct drm_encoder *encoder)
 40{
 41	return container_of(encoder, struct sun4i_rgb,
 42			    encoder);
 43}
 44
 45static int sun4i_rgb_get_modes(struct drm_connector *connector)
 46{
 47	struct sun4i_rgb *rgb =
 48		drm_connector_to_sun4i_rgb(connector);
 49	struct sun4i_drv *drv = rgb->drv;
 50	struct sun4i_tcon *tcon = drv->tcon;
 51
 52	return drm_panel_get_modes(tcon->panel);
 53}
 54
 55static int sun4i_rgb_mode_valid(struct drm_connector *connector,
 56				struct drm_display_mode *mode)
 57{
 58	struct sun4i_rgb *rgb = drm_connector_to_sun4i_rgb(connector);
 59	struct sun4i_drv *drv = rgb->drv;
 60	struct sun4i_tcon *tcon = drv->tcon;
 61	u32 hsync = mode->hsync_end - mode->hsync_start;
 62	u32 vsync = mode->vsync_end - mode->vsync_start;
 63	unsigned long rate = mode->clock * 1000;
 64	long rounded_rate;
 65
 66	DRM_DEBUG_DRIVER("Validating modes...\n");
 67
 68	if (hsync < 1)
 69		return MODE_HSYNC_NARROW;
 70
 71	if (hsync > 0x3ff)
 72		return MODE_HSYNC_WIDE;
 73
 74	if ((mode->hdisplay < 1) || (mode->htotal < 1))
 75		return MODE_H_ILLEGAL;
 76
 77	if ((mode->hdisplay > 0x7ff) || (mode->htotal > 0xfff))
 78		return MODE_BAD_HVALUE;
 79
 80	DRM_DEBUG_DRIVER("Horizontal parameters OK\n");
 81
 82	if (vsync < 1)
 83		return MODE_VSYNC_NARROW;
 84
 85	if (vsync > 0x3ff)
 86		return MODE_VSYNC_WIDE;
 87
 88	if ((mode->vdisplay < 1) || (mode->vtotal < 1))
 89		return MODE_V_ILLEGAL;
 90
 91	if ((mode->vdisplay > 0x7ff) || (mode->vtotal > 0xfff))
 92		return MODE_BAD_VVALUE;
 93
 94	DRM_DEBUG_DRIVER("Vertical parameters OK\n");
 95
 96	rounded_rate = clk_round_rate(tcon->dclk, rate);
 97	if (rounded_rate < rate)
 98		return MODE_CLOCK_LOW;
 99
100	if (rounded_rate > rate)
101		return MODE_CLOCK_HIGH;
102
103	DRM_DEBUG_DRIVER("Clock rate OK\n");
104
105	return MODE_OK;
106}
107
108static struct drm_connector_helper_funcs sun4i_rgb_con_helper_funcs = {
109	.get_modes	= sun4i_rgb_get_modes,
110	.mode_valid	= sun4i_rgb_mode_valid,
111};
112
113static void
114sun4i_rgb_connector_destroy(struct drm_connector *connector)
115{
116	struct sun4i_rgb *rgb = drm_connector_to_sun4i_rgb(connector);
117	struct sun4i_drv *drv = rgb->drv;
118	struct sun4i_tcon *tcon = drv->tcon;
119
120	drm_panel_detach(tcon->panel);
121	drm_connector_cleanup(connector);
122}
123
124static struct drm_connector_funcs sun4i_rgb_con_funcs = {
125	.dpms			= drm_atomic_helper_connector_dpms,
126	.fill_modes		= drm_helper_probe_single_connector_modes,
127	.destroy		= sun4i_rgb_connector_destroy,
128	.reset			= drm_atomic_helper_connector_reset,
129	.atomic_duplicate_state	= drm_atomic_helper_connector_duplicate_state,
130	.atomic_destroy_state	= drm_atomic_helper_connector_destroy_state,
131};
132
133static int sun4i_rgb_atomic_check(struct drm_encoder *encoder,
134				  struct drm_crtc_state *crtc_state,
135				  struct drm_connector_state *conn_state)
136{
137	return 0;
138}
139
140static void sun4i_rgb_encoder_enable(struct drm_encoder *encoder)
141{
142	struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
143	struct sun4i_drv *drv = rgb->drv;
144	struct sun4i_tcon *tcon = drv->tcon;
145
146	DRM_DEBUG_DRIVER("Enabling RGB output\n");
147
148	if (!IS_ERR(tcon->panel))
149		drm_panel_prepare(tcon->panel);
150
151	sun4i_tcon_channel_enable(tcon, 0);
152
153	if (!IS_ERR(tcon->panel))
154		drm_panel_enable(tcon->panel);
155}
156
157static void sun4i_rgb_encoder_disable(struct drm_encoder *encoder)
158{
159	struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
160	struct sun4i_drv *drv = rgb->drv;
161	struct sun4i_tcon *tcon = drv->tcon;
162
163	DRM_DEBUG_DRIVER("Disabling RGB output\n");
164
165	if (!IS_ERR(tcon->panel))
166		drm_panel_disable(tcon->panel);
167
168	sun4i_tcon_channel_disable(tcon, 0);
169
170	if (!IS_ERR(tcon->panel))
171		drm_panel_unprepare(tcon->panel);
172}
173
174static void sun4i_rgb_encoder_mode_set(struct drm_encoder *encoder,
175				       struct drm_display_mode *mode,
176				       struct drm_display_mode *adjusted_mode)
177{
178	struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
179	struct sun4i_drv *drv = rgb->drv;
180	struct sun4i_tcon *tcon = drv->tcon;
181
182	sun4i_tcon0_mode_set(tcon, mode);
183
184	clk_set_rate(tcon->dclk, mode->crtc_clock * 1000);
185
186	/* FIXME: This seems to be board specific */
187	clk_set_phase(tcon->dclk, 120);
188}
189
190static struct drm_encoder_helper_funcs sun4i_rgb_enc_helper_funcs = {
191	.atomic_check	= sun4i_rgb_atomic_check,
192	.mode_set	= sun4i_rgb_encoder_mode_set,
193	.disable	= sun4i_rgb_encoder_disable,
194	.enable		= sun4i_rgb_encoder_enable,
195};
196
197static void sun4i_rgb_enc_destroy(struct drm_encoder *encoder)
198{
199	drm_encoder_cleanup(encoder);
200}
201
202static struct drm_encoder_funcs sun4i_rgb_enc_funcs = {
203	.destroy	= sun4i_rgb_enc_destroy,
204};
205
206int sun4i_rgb_init(struct drm_device *drm)
207{
208	struct sun4i_drv *drv = drm->dev_private;
209	struct sun4i_tcon *tcon = drv->tcon;
210	struct drm_encoder *encoder;
211	struct sun4i_rgb *rgb;
212	int ret;
213
214	rgb = devm_kzalloc(drm->dev, sizeof(*rgb), GFP_KERNEL);
215	if (!rgb)
216		return -ENOMEM;
217	rgb->drv = drv;
218	encoder = &rgb->encoder;
219
220	tcon->panel = sun4i_tcon_find_panel(tcon->dev->of_node);
221	encoder->bridge = sun4i_tcon_find_bridge(tcon->dev->of_node);
222	if (IS_ERR(tcon->panel) && IS_ERR(encoder->bridge)) {
223		dev_info(drm->dev, "No panel or bridge found... RGB output disabled\n");
224		return 0;
225	}
226
227	drm_encoder_helper_add(&rgb->encoder,
228			       &sun4i_rgb_enc_helper_funcs);
229	ret = drm_encoder_init(drm,
230			       &rgb->encoder,
231			       &sun4i_rgb_enc_funcs,
232			       DRM_MODE_ENCODER_NONE,
233			       NULL);
234	if (ret) {
235		dev_err(drm->dev, "Couldn't initialise the rgb encoder\n");
236		goto err_out;
237	}
238
239	/* The RGB encoder can only work with the TCON channel 0 */
240	rgb->encoder.possible_crtcs = BIT(0);
241
242	if (!IS_ERR(tcon->panel)) {
243		drm_connector_helper_add(&rgb->connector,
244					 &sun4i_rgb_con_helper_funcs);
245		ret = drm_connector_init(drm, &rgb->connector,
246					 &sun4i_rgb_con_funcs,
247					 DRM_MODE_CONNECTOR_Unknown);
248		if (ret) {
249			dev_err(drm->dev, "Couldn't initialise the rgb connector\n");
250			goto err_cleanup_connector;
251		}
252
253		drm_mode_connector_attach_encoder(&rgb->connector,
254						  &rgb->encoder);
255
256		ret = drm_panel_attach(tcon->panel, &rgb->connector);
257		if (ret) {
258			dev_err(drm->dev, "Couldn't attach our panel\n");
259			goto err_cleanup_connector;
260		}
261	}
262
263	if (!IS_ERR(encoder->bridge)) {
264		encoder->bridge->encoder = &rgb->encoder;
265
266		ret = drm_bridge_attach(drm, encoder->bridge);
267		if (ret) {
268			dev_err(drm->dev, "Couldn't attach our bridge\n");
269			goto err_cleanup_connector;
270		}
271	} else {
272		encoder->bridge = NULL;
273	}
274
275	return 0;
276
277err_cleanup_connector:
278	drm_encoder_cleanup(&rgb->encoder);
279err_out:
280	return ret;
281}
282EXPORT_SYMBOL(sun4i_rgb_init);