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 <drm/drm_gem_framebuffer_helper.h>
 22#include <uapi/drm/exynos_drm.h>
 23
 24#include "exynos_drm_drv.h"
 25#include "exynos_drm_fb.h"
 26#include "exynos_drm_fbdev.h"
 27#include "exynos_drm_iommu.h"
 28#include "exynos_drm_crtc.h"
 29
 30static int check_fb_gem_memory_type(struct drm_device *drm_dev,
 31				    struct exynos_drm_gem *exynos_gem)
 32{
 33	unsigned int flags;
 34
 35	/*
 36	 * if exynos drm driver supports iommu then framebuffer can use
 37	 * all the buffer types.
 38	 */
 39	if (is_drm_iommu_supported(drm_dev))
 40		return 0;
 41
 42	flags = exynos_gem->flags;
 43
 44	/*
 45	 * Physically non-contiguous memory type for framebuffer is not
 46	 * supported without IOMMU.
 47	 */
 48	if (IS_NONCONTIG_BUFFER(flags)) {
 49		DRM_ERROR("Non-contiguous GEM memory is not supported.\n");
 50		return -EINVAL;
 51	}
 52
 53	return 0;
 54}
 55
 56static const struct drm_framebuffer_funcs exynos_drm_fb_funcs = {
 57	.destroy	= drm_gem_fb_destroy,
 58	.create_handle	= drm_gem_fb_create_handle,
 59};
 60
 61struct drm_framebuffer *
 62exynos_drm_framebuffer_init(struct drm_device *dev,
 63			    const struct drm_mode_fb_cmd2 *mode_cmd,
 64			    struct exynos_drm_gem **exynos_gem,
 65			    int count)
 66{
 67	struct drm_framebuffer *fb;
 68	int i;
 69	int ret;
 70
 71	fb = kzalloc(sizeof(*fb), GFP_KERNEL);
 72	if (!fb)
 73		return ERR_PTR(-ENOMEM);
 74
 75	for (i = 0; i < count; i++) {
 76		ret = check_fb_gem_memory_type(dev, exynos_gem[i]);
 77		if (ret < 0)
 78			goto err;
 79
 80		fb->obj[i] = &exynos_gem[i]->base;
 81	}
 82
 83	drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd);
 84
 85	ret = drm_framebuffer_init(dev, fb, &exynos_drm_fb_funcs);
 86	if (ret < 0) {
 87		DRM_ERROR("failed to initialize framebuffer\n");
 88		goto err;
 89	}
 90
 91	return fb;
 92
 93err:
 94	kfree(fb);
 95	return ERR_PTR(ret);
 96}
 97
 98static struct drm_framebuffer *
 99exynos_user_fb_create(struct drm_device *dev, struct drm_file *file_priv,
100		      const struct drm_mode_fb_cmd2 *mode_cmd)
101{
102	const struct drm_format_info *info = drm_get_format_info(dev, mode_cmd);
103	struct exynos_drm_gem *exynos_gem[MAX_FB_BUFFER];
104	struct drm_gem_object *obj;
105	struct drm_framebuffer *fb;
106	int i;
107	int ret;
108
109	for (i = 0; i < info->num_planes; i++) {
110		unsigned int height = (i == 0) ? mode_cmd->height :
111				     DIV_ROUND_UP(mode_cmd->height, info->vsub);
112		unsigned long size = height * mode_cmd->pitches[i] +
113				     mode_cmd->offsets[i];
114
115		obj = drm_gem_object_lookup(file_priv, mode_cmd->handles[i]);
116		if (!obj) {
117			DRM_ERROR("failed to lookup gem object\n");
118			ret = -ENOENT;
119			goto err;
120		}
121
122		exynos_gem[i] = to_exynos_gem(obj);
123
124		if (size > exynos_gem[i]->size) {
125			i++;
126			ret = -EINVAL;
127			goto err;
128		}
129	}
130
131	fb = exynos_drm_framebuffer_init(dev, mode_cmd, exynos_gem, i);
132	if (IS_ERR(fb)) {
133		ret = PTR_ERR(fb);
134		goto err;
135	}
136
137	return fb;
138
139err:
140	while (i--)
141		drm_gem_object_unreference_unlocked(&exynos_gem[i]->base);
142
143	return ERR_PTR(ret);
144}
145
146dma_addr_t exynos_drm_fb_dma_addr(struct drm_framebuffer *fb, int index)
147{
148	struct exynos_drm_gem *exynos_gem;
149
150	if (WARN_ON_ONCE(index >= MAX_FB_BUFFER))
151		return 0;
152
153	exynos_gem = to_exynos_gem(fb->obj[index]);
154	return exynos_gem->dma_addr + fb->offsets[index];
155}
156
157static struct drm_mode_config_helper_funcs exynos_drm_mode_config_helpers = {
158	.atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
159};
160
161static const struct drm_mode_config_funcs exynos_drm_mode_config_funcs = {
162	.fb_create = exynos_user_fb_create,
163	.output_poll_changed = drm_fb_helper_output_poll_changed,
164	.atomic_check = exynos_atomic_check,
165	.atomic_commit = drm_atomic_helper_commit,
166};
167
168void exynos_drm_mode_config_init(struct drm_device *dev)
169{
170	dev->mode_config.min_width = 0;
171	dev->mode_config.min_height = 0;
172
173	/*
174	 * set max width and height as default value(4096x4096).
175	 * this value would be used to check framebuffer size limitation
176	 * at drm_mode_addfb().
177	 */
178	dev->mode_config.max_width = 4096;
179	dev->mode_config.max_height = 4096;
180
181	dev->mode_config.funcs = &exynos_drm_mode_config_funcs;
182	dev->mode_config.helper_private = &exynos_drm_mode_config_helpers;
183
184	dev->mode_config.allow_fb_modifiers = true;
185}