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_probe_helper.h>
 19#include <drm/exynos_drm.h>
 20
 21#include "exynos_drm_drv.h"
 22#include "exynos_drm_fb.h"
 23#include "exynos_drm_fbdev.h"
 24
 25#define MAX_CONNECTOR		4
 26#define PREFERRED_BPP		32
 27
 28#define to_exynos_fbdev(x)	container_of(x, struct exynos_drm_fbdev,\
 29				drm_fb_helper)
 30
 31struct exynos_drm_fbdev {
 32	struct drm_fb_helper	drm_fb_helper;
 33	struct exynos_drm_gem	*exynos_gem;
 34};
 35
 36static int exynos_drm_fb_mmap(struct fb_info *info,
 37			struct vm_area_struct *vma)
 38{
 39	struct drm_fb_helper *helper = info->par;
 40	struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper);
 41	struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem;
 42	unsigned long vm_size;
 43	int ret;
 44
 45	vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
 46
 47	vm_size = vma->vm_end - vma->vm_start;
 48
 49	if (vm_size > exynos_gem->size)
 50		return -EINVAL;
 51
 52	ret = dma_mmap_attrs(to_dma_dev(helper->dev), vma, exynos_gem->cookie,
 53			     exynos_gem->dma_addr, exynos_gem->size,
 54			     exynos_gem->dma_attrs);
 55	if (ret < 0) {
 56		DRM_DEV_ERROR(to_dma_dev(helper->dev), "failed to mmap.\n");
 57		return ret;
 58	}
 59
 60	return 0;
 61}
 62
 63static const struct fb_ops exynos_drm_fb_ops = {
 64	.owner		= THIS_MODULE,
 65	DRM_FB_HELPER_DEFAULT_OPS,
 66	.fb_mmap        = exynos_drm_fb_mmap,
 67	.fb_fillrect	= drm_fb_helper_cfb_fillrect,
 68	.fb_copyarea	= drm_fb_helper_cfb_copyarea,
 69	.fb_imageblit	= drm_fb_helper_cfb_imageblit,
 70};
 71
 72static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
 73				   struct drm_fb_helper_surface_size *sizes,
 74				   struct exynos_drm_gem *exynos_gem)
 75{
 76	struct fb_info *fbi;
 77	struct drm_framebuffer *fb = helper->fb;
 78	unsigned int size = fb->width * fb->height * fb->format->cpp[0];
 79	unsigned long offset;
 80
 81	fbi = drm_fb_helper_alloc_fbi(helper);
 82	if (IS_ERR(fbi)) {
 83		DRM_DEV_ERROR(to_dma_dev(helper->dev),
 84			      "failed to allocate fb info.\n");
 85		return PTR_ERR(fbi);
 86	}
 87
 88	fbi->fbops = &exynos_drm_fb_ops;
 89
 90	drm_fb_helper_fill_info(fbi, helper, sizes);
 91
 92	offset = fbi->var.xoffset * fb->format->cpp[0];
 93	offset += fbi->var.yoffset * fb->pitches[0];
 94
 95	fbi->screen_buffer = exynos_gem->kvaddr + offset;
 96	fbi->screen_size = size;
 97	fbi->fix.smem_len = size;
 98
 99	return 0;
100}
101
102static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
103				    struct drm_fb_helper_surface_size *sizes)
104{
105	struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
106	struct exynos_drm_gem *exynos_gem;
107	struct drm_device *dev = helper->dev;
108	struct drm_mode_fb_cmd2 mode_cmd = { 0 };
109	unsigned long size;
110	int ret;
111
112	DRM_DEV_DEBUG_KMS(dev->dev,
113			  "surface width(%d), height(%d) and bpp(%d\n",
114			  sizes->surface_width, sizes->surface_height,
115			  sizes->surface_bpp);
116
117	mode_cmd.width = sizes->surface_width;
118	mode_cmd.height = sizes->surface_height;
119	mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
120	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
121							  sizes->surface_depth);
122
123	size = mode_cmd.pitches[0] * mode_cmd.height;
124
125	exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_WC, size, true);
126	if (IS_ERR(exynos_gem))
127		return PTR_ERR(exynos_gem);
128
129	exynos_fbdev->exynos_gem = exynos_gem;
130
131	helper->fb =
132		exynos_drm_framebuffer_init(dev, &mode_cmd, &exynos_gem, 1);
133	if (IS_ERR(helper->fb)) {
134		DRM_DEV_ERROR(dev->dev, "failed to create drm framebuffer.\n");
135		ret = PTR_ERR(helper->fb);
136		goto err_destroy_gem;
137	}
138
139	ret = exynos_drm_fbdev_update(helper, sizes, exynos_gem);
140	if (ret < 0)
141		goto err_destroy_framebuffer;
142
143	return ret;
144
145err_destroy_framebuffer:
146	drm_framebuffer_cleanup(helper->fb);
147err_destroy_gem:
148	exynos_drm_gem_destroy(exynos_gem);
149
150	/*
151	 * if failed, all resources allocated above would be released by
152	 * drm_mode_config_cleanup() when drm_load() had been called prior
153	 * to any specific driver such as fimd or hdmi driver.
154	 */
155
156	return ret;
157}
158
159static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
160	.fb_probe =	exynos_drm_fbdev_create,
161};
162
163int exynos_drm_fbdev_init(struct drm_device *dev)
164{
165	struct exynos_drm_fbdev *fbdev;
166	struct exynos_drm_private *private = dev->dev_private;
167	struct drm_fb_helper *helper;
168	int ret;
169
170	if (!dev->mode_config.num_crtc)
171		return 0;
172
173	fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
174	if (!fbdev)
175		return -ENOMEM;
176
177	private->fb_helper = helper = &fbdev->drm_fb_helper;
178
179	drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs);
180
181	ret = drm_fb_helper_init(dev, helper);
182	if (ret < 0) {
183		DRM_DEV_ERROR(dev->dev,
184			      "failed to initialize drm fb helper.\n");
185		goto err_init;
186	}
187
188	ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
189	if (ret < 0) {
190		DRM_DEV_ERROR(dev->dev,
191			      "failed to set up hw configuration.\n");
192		goto err_setup;
193	}
194
195	return 0;
196
197err_setup:
198	drm_fb_helper_fini(helper);
199
200err_init:
201	private->fb_helper = NULL;
202	kfree(fbdev);
203
204	return ret;
205}
206
207static void exynos_drm_fbdev_destroy(struct drm_device *dev,
208				      struct drm_fb_helper *fb_helper)
209{
210	struct drm_framebuffer *fb;
211
212	/* release drm framebuffer and real buffer */
213	if (fb_helper->fb && fb_helper->fb->funcs) {
214		fb = fb_helper->fb;
215		if (fb)
216			drm_framebuffer_remove(fb);
217	}
218
219	drm_fb_helper_unregister_fbi(fb_helper);
220
221	drm_fb_helper_fini(fb_helper);
222}
223
224void exynos_drm_fbdev_fini(struct drm_device *dev)
225{
226	struct exynos_drm_private *private = dev->dev_private;
227	struct exynos_drm_fbdev *fbdev;
228
229	if (!private || !private->fb_helper)
230		return;
231
232	fbdev = to_exynos_fbdev(private->fb_helper);
233
234	exynos_drm_fbdev_destroy(dev, private->fb_helper);
235	kfree(fbdev);
236	private->fb_helper = NULL;
237}
238