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 <drm/drm_atomic_helper.h>
 14#include <drm/drm_plane_helper.h>
 15#include <drm/drmP.h>
 16
 17#include "sun4i_backend.h"
 18#include "sun4i_frontend.h"
 19#include "sun4i_layer.h"
 20#include "sunxi_engine.h"
 21
 22static void sun4i_backend_layer_reset(struct drm_plane *plane)
 23{
 24	struct sun4i_layer *layer = plane_to_sun4i_layer(plane);
 25	struct sun4i_layer_state *state;
 26
 27	if (plane->state) {
 28		state = state_to_sun4i_layer_state(plane->state);
 29
 30		__drm_atomic_helper_plane_destroy_state(&state->state);
 31
 32		kfree(state);
 33		plane->state = NULL;
 34	}
 35
 36	state = kzalloc(sizeof(*state), GFP_KERNEL);
 37	if (state) {
 38		plane->state = &state->state;
 39		plane->state->plane = plane;
 40		plane->state->zpos = layer->id;
 41	}
 42}
 43
 44static struct drm_plane_state *
 45sun4i_backend_layer_duplicate_state(struct drm_plane *plane)
 46{
 47	struct sun4i_layer_state *orig = state_to_sun4i_layer_state(plane->state);
 48	struct sun4i_layer_state *copy;
 49
 50	copy = kzalloc(sizeof(*copy), GFP_KERNEL);
 51	if (!copy)
 52		return NULL;
 53
 54	__drm_atomic_helper_plane_duplicate_state(plane, &copy->state);
 55	copy->uses_frontend = orig->uses_frontend;
 56
 57	return &copy->state;
 58}
 59
 60static void sun4i_backend_layer_destroy_state(struct drm_plane *plane,
 61					      struct drm_plane_state *state)
 62{
 63	struct sun4i_layer_state *s_state = state_to_sun4i_layer_state(state);
 64
 65	__drm_atomic_helper_plane_destroy_state(state);
 66
 67	kfree(s_state);
 68}
 69
 70static void sun4i_backend_layer_atomic_disable(struct drm_plane *plane,
 71					       struct drm_plane_state *old_state)
 72{
 73	struct sun4i_layer_state *layer_state = state_to_sun4i_layer_state(old_state);
 74	struct sun4i_layer *layer = plane_to_sun4i_layer(plane);
 75	struct sun4i_backend *backend = layer->backend;
 76
 77	sun4i_backend_layer_enable(backend, layer->id, false);
 78
 79	if (layer_state->uses_frontend) {
 80		unsigned long flags;
 81
 82		spin_lock_irqsave(&backend->frontend_lock, flags);
 83		backend->frontend_teardown = true;
 84		spin_unlock_irqrestore(&backend->frontend_lock, flags);
 85	}
 86}
 87
 88static void sun4i_backend_layer_atomic_update(struct drm_plane *plane,
 89					      struct drm_plane_state *old_state)
 90{
 91	struct sun4i_layer_state *layer_state = state_to_sun4i_layer_state(plane->state);
 92	struct sun4i_layer *layer = plane_to_sun4i_layer(plane);
 93	struct sun4i_backend *backend = layer->backend;
 94	struct sun4i_frontend *frontend = backend->frontend;
 95
 96	if (layer_state->uses_frontend) {
 97		sun4i_frontend_init(frontend);
 98		sun4i_frontend_update_coord(frontend, plane);
 99		sun4i_frontend_update_buffer(frontend, plane);
100		sun4i_frontend_update_formats(frontend, plane,
101					      DRM_FORMAT_ARGB8888);
102		sun4i_backend_update_layer_frontend(backend, layer->id,
103						    DRM_FORMAT_ARGB8888);
104		sun4i_frontend_enable(frontend);
105	} else {
106		sun4i_backend_update_layer_formats(backend, layer->id, plane);
107		sun4i_backend_update_layer_buffer(backend, layer->id, plane);
108	}
109
110	sun4i_backend_update_layer_coord(backend, layer->id, plane);
111	sun4i_backend_update_layer_zpos(backend, layer->id, plane);
112	sun4i_backend_layer_enable(backend, layer->id, true);
113}
114
115static const struct drm_plane_helper_funcs sun4i_backend_layer_helper_funcs = {
116	.atomic_disable	= sun4i_backend_layer_atomic_disable,
117	.atomic_update	= sun4i_backend_layer_atomic_update,
118};
119
120static const struct drm_plane_funcs sun4i_backend_layer_funcs = {
121	.atomic_destroy_state	= sun4i_backend_layer_destroy_state,
122	.atomic_duplicate_state	= sun4i_backend_layer_duplicate_state,
123	.destroy		= drm_plane_cleanup,
124	.disable_plane		= drm_atomic_helper_disable_plane,
125	.reset			= sun4i_backend_layer_reset,
126	.update_plane		= drm_atomic_helper_update_plane,
127};
128
129static const uint32_t sun4i_backend_layer_formats[] = {
130	DRM_FORMAT_ARGB8888,
131	DRM_FORMAT_ARGB4444,
132	DRM_FORMAT_ARGB1555,
133	DRM_FORMAT_RGBA5551,
134	DRM_FORMAT_RGBA4444,
135	DRM_FORMAT_RGB888,
136	DRM_FORMAT_RGB565,
137	DRM_FORMAT_UYVY,
138	DRM_FORMAT_VYUY,
139	DRM_FORMAT_XRGB8888,
140	DRM_FORMAT_YUYV,
141	DRM_FORMAT_YVYU,
142};
143
144static struct sun4i_layer *sun4i_layer_init_one(struct drm_device *drm,
145						struct sun4i_backend *backend,
146						enum drm_plane_type type)
147{
148	struct sun4i_layer *layer;
149	int ret;
150
151	layer = devm_kzalloc(drm->dev, sizeof(*layer), GFP_KERNEL);
152	if (!layer)
153		return ERR_PTR(-ENOMEM);
154
155	/* possible crtcs are set later */
156	ret = drm_universal_plane_init(drm, &layer->plane, 0,
157				       &sun4i_backend_layer_funcs,
158				       sun4i_backend_layer_formats,
159				       ARRAY_SIZE(sun4i_backend_layer_formats),
160				       NULL, type, NULL);
161	if (ret) {
162		dev_err(drm->dev, "Couldn't initialize layer\n");
163		return ERR_PTR(ret);
164	}
165
166	drm_plane_helper_add(&layer->plane,
167			     &sun4i_backend_layer_helper_funcs);
168	layer->backend = backend;
169
170	drm_plane_create_zpos_property(&layer->plane, 0, 0,
171				       SUN4I_BACKEND_NUM_LAYERS - 1);
172
173	return layer;
174}
175
176struct drm_plane **sun4i_layers_init(struct drm_device *drm,
177				     struct sunxi_engine *engine)
178{
179	struct drm_plane **planes;
180	struct sun4i_backend *backend = engine_to_sun4i_backend(engine);
181	int i;
182
183	/* We need to have a sentinel at the need, hence the overallocation */
184	planes = devm_kcalloc(drm->dev, SUN4I_BACKEND_NUM_LAYERS + 1,
185			      sizeof(*planes), GFP_KERNEL);
186	if (!planes)
187		return ERR_PTR(-ENOMEM);
188
189	for (i = 0; i < SUN4I_BACKEND_NUM_LAYERS; i++) {
190		enum drm_plane_type type = i ? DRM_PLANE_TYPE_OVERLAY : DRM_PLANE_TYPE_PRIMARY;
191		struct sun4i_layer *layer;
192
193		layer = sun4i_layer_init_one(drm, backend, type);
194		if (IS_ERR(layer)) {
195			dev_err(drm->dev, "Couldn't initialize %s plane\n",
196				i ? "overlay" : "primary");
197			return ERR_CAST(layer);
198		};
199
200		layer->id = i;
201		planes[i] = &layer->plane;
202	};
203
204	return planes;
205}