1// SPDX-License-Identifier: GPL-2.0-or-later
  2/* exynos_drm_fb.c
  3 *
  4 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
  5 * Authors:
  6 *	Inki Dae <inki.dae@samsung.com>
  7 *	Joonyoung Shim <jy0922.shim@samsung.com>
  8 *	Seung-Woo Kim <sw0312.kim@samsung.com>
  9 */
 10
 11#include <drm/drm_atomic.h>
 12#include <drm/drm_atomic_helper.h>
 13#include <drm/drm_crtc.h>
 14#include <drm/drm_fb_helper.h>
 15#include <drm/drm_framebuffer.h>
 16#include <drm/drm_fourcc.h>
 17#include <drm/drm_gem_framebuffer_helper.h>
 18#include <drm/drm_probe_helper.h>
 19#include <drm/exynos_drm.h>
 20
 21#include "exynos_drm_crtc.h"
 22#include "exynos_drm_drv.h"
 23#include "exynos_drm_fb.h"
 24#include "exynos_drm_fbdev.h"
 25
 26static int check_fb_gem_memory_type(struct drm_device *drm_dev,
 27				    struct exynos_drm_gem *exynos_gem)
 28{
 29	unsigned int flags;
 30
 31	/*
 32	 * if exynos drm driver supports iommu then framebuffer can use
 33	 * all the buffer types.
 34	 */
 35	if (is_drm_iommu_supported(drm_dev))
 36		return 0;
 37
 38	flags = exynos_gem->flags;
 39
 40	/*
 41	 * Physically non-contiguous memory type for framebuffer is not
 42	 * supported without IOMMU.
 43	 */
 44	if (IS_NONCONTIG_BUFFER(flags)) {
 45		DRM_DEV_ERROR(drm_dev->dev,
 46			      "Non-contiguous GEM memory is not supported.\n");
 47		return -EINVAL;
 48	}
 49
 50	return 0;
 51}
 52
 53static const struct drm_framebuffer_funcs exynos_drm_fb_funcs = {
 54	.destroy	= drm_gem_fb_destroy,
 55	.create_handle	= drm_gem_fb_create_handle,
 56};
 57
 58struct drm_framebuffer *
 59exynos_drm_framebuffer_init(struct drm_device *dev,
 60			    const struct drm_mode_fb_cmd2 *mode_cmd,
 61			    struct exynos_drm_gem **exynos_gem,
 62			    int count)
 63{
 64	struct drm_framebuffer *fb;
 65	int i;
 66	int ret;
 67
 68	fb = kzalloc(sizeof(*fb), GFP_KERNEL);
 69	if (!fb)
 70		return ERR_PTR(-ENOMEM);
 71
 72	for (i = 0; i < count; i++) {
 73		ret = check_fb_gem_memory_type(dev, exynos_gem[i]);
 74		if (ret < 0)
 75			goto err;
 76
 77		fb->obj[i] = &exynos_gem[i]->base;
 78	}
 79
 80	drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd);
 81
 82	ret = drm_framebuffer_init(dev, fb, &exynos_drm_fb_funcs);
 83	if (ret < 0) {
 84		DRM_DEV_ERROR(dev->dev,
 85			      "failed to initialize framebuffer\n");
 86		goto err;
 87	}
 88
 89	return fb;
 90
 91err:
 92	kfree(fb);
 93	return ERR_PTR(ret);
 94}
 95
 96static struct drm_framebuffer *
 97exynos_user_fb_create(struct drm_device *dev, struct drm_file *file_priv,
 98		      const struct drm_mode_fb_cmd2 *mode_cmd)
 99{
100	const struct drm_format_info *info = drm_get_format_info(dev, mode_cmd);
101	struct exynos_drm_gem *exynos_gem[MAX_FB_BUFFER];
102	struct drm_framebuffer *fb;
103	int i;
104	int ret;
105
106	for (i = 0; i < info->num_planes; i++) {
107		unsigned int height = (i == 0) ? mode_cmd->height :
108				     DIV_ROUND_UP(mode_cmd->height, info->vsub);
109		unsigned long size = height * mode_cmd->pitches[i] +
110				     mode_cmd->offsets[i];
111
112		exynos_gem[i] = exynos_drm_gem_get(file_priv,
113						   mode_cmd->handles[i]);
114		if (!exynos_gem[i]) {
115			DRM_DEV_ERROR(dev->dev,
116				      "failed to lookup gem object\n");
117			ret = -ENOENT;
118			goto err;
119		}
120
121		if (size > exynos_gem[i]->size) {
122			i++;
123			ret = -EINVAL;
124			goto err;
125		}
126	}
127
128	fb = exynos_drm_framebuffer_init(dev, mode_cmd, exynos_gem, i);
129	if (IS_ERR(fb)) {
130		ret = PTR_ERR(fb);
131		goto err;
132	}
133
134	return fb;
135
136err:
137	while (i--)
138		exynos_drm_gem_put(exynos_gem[i]);
139
140	return ERR_PTR(ret);
141}
142
143dma_addr_t exynos_drm_fb_dma_addr(struct drm_framebuffer *fb, int index)
144{
145	struct exynos_drm_gem *exynos_gem;
146
147	if (WARN_ON_ONCE(index >= MAX_FB_BUFFER))
148		return 0;
149
150	exynos_gem = to_exynos_gem(fb->obj[index]);
151	return exynos_gem->dma_addr + fb->offsets[index];
152}
153
154static struct drm_mode_config_helper_funcs exynos_drm_mode_config_helpers = {
155	.atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
156};
157
158static const struct drm_mode_config_funcs exynos_drm_mode_config_funcs = {
159	.fb_create = exynos_user_fb_create,
160	.output_poll_changed = drm_fb_helper_output_poll_changed,
161	.atomic_check = drm_atomic_helper_check,
162	.atomic_commit = drm_atomic_helper_commit,
163};
164
165void exynos_drm_mode_config_init(struct drm_device *dev)
166{
167	dev->mode_config.min_width = 0;
168	dev->mode_config.min_height = 0;
169
170	/*
171	 * set max width and height as default value(4096x4096).
172	 * this value would be used to check framebuffer size limitation
173	 * at drm_mode_addfb().
174	 */
175	dev->mode_config.max_width = 4096;
176	dev->mode_config.max_height = 4096;
177
178	dev->mode_config.funcs = &exynos_drm_mode_config_funcs;
179	dev->mode_config.helper_private = &exynos_drm_mode_config_helpers;
180
181	dev->mode_config.normalize_zpos = true;
182}