1// SPDX-License-Identifier: GPL-2.0-or-later
  2/* exynos_drm_fbdev.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 <linux/console.h>
 12#include <linux/dma-mapping.h>
 13#include <linux/vmalloc.h>
 14
 15#include <drm/drm_crtc.h>
 16#include <drm/drm_fb_helper.h>
 17#include <drm/drm_fourcc.h>
 18#include <drm/drm_framebuffer.h>
 19#include <drm/drm_prime.h>
 20#include <drm/drm_probe_helper.h>
 21#include <drm/exynos_drm.h>
 22
 23#include "exynos_drm_drv.h"
 24#include "exynos_drm_fb.h"
 25#include "exynos_drm_fbdev.h"
 26
 27#define MAX_CONNECTOR		4
 28#define PREFERRED_BPP		32
 29
 30#define to_exynos_fbdev(x)	container_of(x, struct exynos_drm_fbdev,\
 31				drm_fb_helper)
 32
 33struct exynos_drm_fbdev {
 34	struct drm_fb_helper	drm_fb_helper;
 35	struct exynos_drm_gem	*exynos_gem;
 36};
 37
 38static int exynos_drm_fb_mmap(struct fb_info *info,
 39			struct vm_area_struct *vma)
 40{
 41	struct drm_fb_helper *helper = info->par;
 42	struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper);
 43	struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem;
 44
 45	return drm_gem_prime_mmap(&exynos_gem->base, vma);
 46}
 47
 48static const struct fb_ops exynos_drm_fb_ops = {
 49	.owner		= THIS_MODULE,
 50	DRM_FB_HELPER_DEFAULT_OPS,
 51	.fb_mmap        = exynos_drm_fb_mmap,
 52	.fb_read	= drm_fb_helper_cfb_read,
 53	.fb_write	= drm_fb_helper_cfb_write,
 54	.fb_fillrect	= drm_fb_helper_cfb_fillrect,
 55	.fb_copyarea	= drm_fb_helper_cfb_copyarea,
 56	.fb_imageblit	= drm_fb_helper_cfb_imageblit,
 57};
 58
 59static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
 60				   struct drm_fb_helper_surface_size *sizes,
 61				   struct exynos_drm_gem *exynos_gem)
 62{
 63	struct fb_info *fbi;
 64	struct drm_framebuffer *fb = helper->fb;
 65	unsigned int size = fb->width * fb->height * fb->format->cpp[0];
 66	unsigned long offset;
 67
 68	fbi = drm_fb_helper_alloc_info(helper);
 69	if (IS_ERR(fbi)) {
 70		DRM_DEV_ERROR(to_dma_dev(helper->dev),
 71			      "failed to allocate fb info.\n");
 72		return PTR_ERR(fbi);
 73	}
 74
 75	fbi->fbops = &exynos_drm_fb_ops;
 76
 77	drm_fb_helper_fill_info(fbi, helper, sizes);
 78
 79	offset = fbi->var.xoffset * fb->format->cpp[0];
 80	offset += fbi->var.yoffset * fb->pitches[0];
 81
 82	fbi->screen_buffer = exynos_gem->kvaddr + offset;
 83	fbi->screen_size = size;
 84	fbi->fix.smem_len = size;
 85
 86	return 0;
 87}
 88
 89static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
 90				    struct drm_fb_helper_surface_size *sizes)
 91{
 92	struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
 93	struct exynos_drm_gem *exynos_gem;
 94	struct drm_device *dev = helper->dev;
 95	struct drm_mode_fb_cmd2 mode_cmd = { 0 };
 96	unsigned long size;
 97	int ret;
 98
 99	DRM_DEV_DEBUG_KMS(dev->dev,
100			  "surface width(%d), height(%d) and bpp(%d\n",
101			  sizes->surface_width, sizes->surface_height,
102			  sizes->surface_bpp);
103
104	mode_cmd.width = sizes->surface_width;
105	mode_cmd.height = sizes->surface_height;
106	mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
107	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
108							  sizes->surface_depth);
109
110	size = mode_cmd.pitches[0] * mode_cmd.height;
111
112	exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_WC, size, true);
113	if (IS_ERR(exynos_gem))
114		return PTR_ERR(exynos_gem);
115
116	exynos_fbdev->exynos_gem = exynos_gem;
117
118	helper->fb =
119		exynos_drm_framebuffer_init(dev, &mode_cmd, &exynos_gem, 1);
120	if (IS_ERR(helper->fb)) {
121		DRM_DEV_ERROR(dev->dev, "failed to create drm framebuffer.\n");
122		ret = PTR_ERR(helper->fb);
123		goto err_destroy_gem;
124	}
125
126	ret = exynos_drm_fbdev_update(helper, sizes, exynos_gem);
127	if (ret < 0)
128		goto err_destroy_framebuffer;
129
130	return ret;
131
132err_destroy_framebuffer:
133	drm_framebuffer_cleanup(helper->fb);
134err_destroy_gem:
135	exynos_drm_gem_destroy(exynos_gem);
136
137	/*
138	 * if failed, all resources allocated above would be released by
139	 * drm_mode_config_cleanup() when drm_load() had been called prior
140	 * to any specific driver such as fimd or hdmi driver.
141	 */
142
143	return ret;
144}
145
146static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
147	.fb_probe =	exynos_drm_fbdev_create,
148};
149
150int exynos_drm_fbdev_init(struct drm_device *dev)
151{
152	struct exynos_drm_fbdev *fbdev;
153	struct exynos_drm_private *private = dev->dev_private;
154	struct drm_fb_helper *helper;
155	int ret;
156
157	if (!dev->mode_config.num_crtc)
158		return 0;
159
160	fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
161	if (!fbdev)
162		return -ENOMEM;
163
164	private->fb_helper = helper = &fbdev->drm_fb_helper;
165
166	drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs);
167
168	ret = drm_fb_helper_init(dev, helper);
169	if (ret < 0) {
170		DRM_DEV_ERROR(dev->dev,
171			      "failed to initialize drm fb helper.\n");
172		goto err_init;
173	}
174
175	ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
176	if (ret < 0) {
177		DRM_DEV_ERROR(dev->dev,
178			      "failed to set up hw configuration.\n");
179		goto err_setup;
180	}
181
182	return 0;
183
184err_setup:
185	drm_fb_helper_fini(helper);
186
187err_init:
188	private->fb_helper = NULL;
189	kfree(fbdev);
190
191	return ret;
192}
193
194static void exynos_drm_fbdev_destroy(struct drm_device *dev,
195				      struct drm_fb_helper *fb_helper)
196{
197	struct drm_framebuffer *fb;
198
199	/* release drm framebuffer and real buffer */
200	if (fb_helper->fb && fb_helper->fb->funcs) {
201		fb = fb_helper->fb;
202		if (fb)
203			drm_framebuffer_remove(fb);
204	}
205
206	drm_fb_helper_unregister_info(fb_helper);
207
208	drm_fb_helper_fini(fb_helper);
209}
210
211void exynos_drm_fbdev_fini(struct drm_device *dev)
212{
213	struct exynos_drm_private *private = dev->dev_private;
214	struct exynos_drm_fbdev *fbdev;
215
216	if (!private || !private->fb_helper)
217		return;
218
219	fbdev = to_exynos_fbdev(private->fb_helper);
220
221	exynos_drm_fbdev_destroy(dev, private->fb_helper);
222	kfree(fbdev);
223	private->fb_helper = NULL;
224}
225