1/* exynos_drm_fb.c
2 *
3 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
4 * Authors:
5 *	Inki Dae <inki.dae@samsung.com>
6 *	Joonyoung Shim <jy0922.shim@samsung.com>
7 *	Seung-Woo Kim <sw0312.kim@samsung.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 as published by the
11 * Free Software Foundation;  either version 2 of the  License, or (at your
12 * option) any later version.
13 */
14
15#include <drm/drmP.h>
16#include <drm/drm_crtc.h>
17#include <drm/drm_crtc_helper.h>
18#include <drm/drm_fb_helper.h>
19#include <drm/drm_atomic.h>
20#include <drm/drm_atomic_helper.h>
21#include <uapi/drm/exynos_drm.h>
22
23#include "exynos_drm_drv.h"
24#include "exynos_drm_fb.h"
25#include "exynos_drm_fbdev.h"
26#include "exynos_drm_iommu.h"
27#include "exynos_drm_crtc.h"
28
29#define to_exynos_fb(x)	container_of(x, struct exynos_drm_fb, fb)
30
31/*
32 * exynos specific framebuffer structure.
33 *
34 * @fb: drm framebuffer obejct.
35 * @exynos_gem: array of exynos specific gem object containing a gem object.
36 */
37struct exynos_drm_fb {
38	struct drm_framebuffer	fb;
39	struct exynos_drm_gem	*exynos_gem[MAX_FB_BUFFER];
40};
41
42static int check_fb_gem_memory_type(struct drm_device *drm_dev,
43				    struct exynos_drm_gem *exynos_gem)
44{
45	unsigned int flags;
46
47	/*
48	 * if exynos drm driver supports iommu then framebuffer can use
49	 * all the buffer types.
50	 */
51	if (is_drm_iommu_supported(drm_dev))
52		return 0;
53
54	flags = exynos_gem->flags;
55
56	/*
57	 * without iommu support, not support physically non-continuous memory
58	 * for framebuffer.
59	 */
60	if (IS_NONCONTIG_BUFFER(flags)) {
61		DRM_ERROR("cannot use this gem memory type for fb.\n");
62		return -EINVAL;
63	}
64
65	return 0;
66}
67
68static void exynos_drm_fb_destroy(struct drm_framebuffer *fb)
69{
70	struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
71	unsigned int i;
72
73	/* make sure that overlay data are updated before relesing fb. */
74	exynos_drm_crtc_complete_scanout(fb);
75
76	drm_framebuffer_cleanup(fb);
77
78	for (i = 0; i < ARRAY_SIZE(exynos_fb->exynos_gem); i++) {
79		struct drm_gem_object *obj;
80
81		if (exynos_fb->exynos_gem[i] == NULL)
82			continue;
83
84		obj = &exynos_fb->exynos_gem[i]->base;
85		drm_gem_object_unreference_unlocked(obj);
86	}
87
88	kfree(exynos_fb);
89	exynos_fb = NULL;
90}
91
92static int exynos_drm_fb_create_handle(struct drm_framebuffer *fb,
93					struct drm_file *file_priv,
94					unsigned int *handle)
95{
96	struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
97
98	return drm_gem_handle_create(file_priv,
99				     &exynos_fb->exynos_gem[0]->base, handle);
100}
101
102static int exynos_drm_fb_dirty(struct drm_framebuffer *fb,
103				struct drm_file *file_priv, unsigned flags,
104				unsigned color, struct drm_clip_rect *clips,
105				unsigned num_clips)
106{
107	/* TODO */
108
109	return 0;
110}
111
112static struct drm_framebuffer_funcs exynos_drm_fb_funcs = {
113	.destroy	= exynos_drm_fb_destroy,
114	.create_handle	= exynos_drm_fb_create_handle,
115	.dirty		= exynos_drm_fb_dirty,
116};
117
118struct drm_framebuffer *
119exynos_drm_framebuffer_init(struct drm_device *dev,
120			    struct drm_mode_fb_cmd2 *mode_cmd,
121			    struct exynos_drm_gem **exynos_gem,
122			    int count)
123{
124	struct exynos_drm_fb *exynos_fb;
125	int i;
126	int ret;
127
128	exynos_fb = kzalloc(sizeof(*exynos_fb), GFP_KERNEL);
129	if (!exynos_fb)
130		return ERR_PTR(-ENOMEM);
131
132	for (i = 0; i < count; i++) {
133		ret = check_fb_gem_memory_type(dev, exynos_gem[i]);
134		if (ret < 0)
135			goto err;
136
137		exynos_fb->exynos_gem[i] = exynos_gem[i];
138	}
139
140	drm_helper_mode_fill_fb_struct(&exynos_fb->fb, mode_cmd);
141
142	ret = drm_framebuffer_init(dev, &exynos_fb->fb, &exynos_drm_fb_funcs);
143	if (ret < 0) {
144		DRM_ERROR("failed to initialize framebuffer\n");
145		goto err;
146	}
147
148	return &exynos_fb->fb;
149
150err:
151	kfree(exynos_fb);
152	return ERR_PTR(ret);
153}
154
155static struct drm_framebuffer *
156exynos_user_fb_create(struct drm_device *dev, struct drm_file *file_priv,
157		      struct drm_mode_fb_cmd2 *mode_cmd)
158{
159	struct exynos_drm_gem *exynos_gem[MAX_FB_BUFFER];
160	struct drm_gem_object *obj;
161	struct drm_framebuffer *fb;
162	int i;
163	int ret;
164
165	for (i = 0; i < drm_format_num_planes(mode_cmd->pixel_format); i++) {
166		obj = drm_gem_object_lookup(dev, file_priv,
167					    mode_cmd->handles[i]);
168		if (!obj) {
169			DRM_ERROR("failed to lookup gem object\n");
170			ret = -ENOENT;
171			goto err;
172		}
173
174		exynos_gem[i] = to_exynos_gem(obj);
175	}
176
177	fb = exynos_drm_framebuffer_init(dev, mode_cmd, exynos_gem, i);
178	if (IS_ERR(fb)) {
179		ret = PTR_ERR(fb);
180		goto err;
181	}
182
183	return fb;
184
185err:
186	while (i--)
187		drm_gem_object_unreference_unlocked(&exynos_gem[i]->base);
188
189	return ERR_PTR(ret);
190}
191
192struct exynos_drm_gem *exynos_drm_fb_gem(struct drm_framebuffer *fb, int index)
193{
194	struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
195	struct exynos_drm_gem *exynos_gem;
196
197	if (index >= MAX_FB_BUFFER)
198		return NULL;
199
200	exynos_gem = exynos_fb->exynos_gem[index];
201	if (!exynos_gem)
202		return NULL;
203
204	DRM_DEBUG_KMS("dma_addr: 0x%lx\n", (unsigned long)exynos_gem->dma_addr);
205
206	return exynos_gem;
207}
208
209static void exynos_drm_output_poll_changed(struct drm_device *dev)
210{
211	struct exynos_drm_private *private = dev->dev_private;
212	struct drm_fb_helper *fb_helper = private->fb_helper;
213
214	if (fb_helper)
215		drm_fb_helper_hotplug_event(fb_helper);
216	else
217		exynos_drm_fbdev_init(dev);
218}
219
220static const struct drm_mode_config_funcs exynos_drm_mode_config_funcs = {
221	.fb_create = exynos_user_fb_create,
222	.output_poll_changed = exynos_drm_output_poll_changed,
223	.atomic_check = drm_atomic_helper_check,
224	.atomic_commit = exynos_atomic_commit,
225};
226
227void exynos_drm_mode_config_init(struct drm_device *dev)
228{
229	dev->mode_config.min_width = 0;
230	dev->mode_config.min_height = 0;
231
232	/*
233	 * set max width and height as default value(4096x4096).
234	 * this value would be used to check framebuffer size limitation
235	 * at drm_mode_addfb().
236	 */
237	dev->mode_config.max_width = 4096;
238	dev->mode_config.max_height = 4096;
239
240	dev->mode_config.funcs = &exynos_drm_mode_config_funcs;
241}
242