1 /* exynos_drm_fbdev.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  * Permission is hereby granted, free of charge, to any person obtaining a
10  * copy of this software and associated documentation files (the "Software"),
11  * to deal in the Software without restriction, including without limitation
12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13  * and/or sell copies of the Software, and to permit persons to whom the
14  * Software is furnished to do so, subject to the following conditions:
15  *
16  * The above copyright notice and this permission notice (including the next
17  * paragraph) shall be included in all copies or substantial portions of the
18  * Software.
19  *
20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
23  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
24  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
25  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
26  * OTHER DEALINGS IN THE SOFTWARE.
27  */
28 
29 #include <drm/drmP.h>
30 #include <drm/drm_crtc.h>
31 #include <drm/drm_fb_helper.h>
32 #include <drm/drm_crtc_helper.h>
33 
34 #include "exynos_drm_drv.h"
35 #include "exynos_drm_fb.h"
36 #include "exynos_drm_gem.h"
37 
38 #define MAX_CONNECTOR		4
39 #define PREFERRED_BPP		32
40 
41 #define to_exynos_fbdev(x)	container_of(x, struct exynos_drm_fbdev,\
42 				drm_fb_helper)
43 
44 struct exynos_drm_fbdev {
45 	struct drm_fb_helper		drm_fb_helper;
46 	struct exynos_drm_gem_obj	*exynos_gem_obj;
47 };
48 
49 static struct fb_ops exynos_drm_fb_ops = {
50 	.owner		= THIS_MODULE,
51 	.fb_fillrect	= cfb_fillrect,
52 	.fb_copyarea	= cfb_copyarea,
53 	.fb_imageblit	= cfb_imageblit,
54 	.fb_check_var	= drm_fb_helper_check_var,
55 	.fb_set_par	= drm_fb_helper_set_par,
56 	.fb_blank	= drm_fb_helper_blank,
57 	.fb_pan_display	= drm_fb_helper_pan_display,
58 	.fb_setcmap	= drm_fb_helper_setcmap,
59 };
60 
61 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
62 				     struct drm_framebuffer *fb)
63 {
64 	struct fb_info *fbi = helper->fbdev;
65 	struct drm_device *dev = helper->dev;
66 	struct exynos_drm_gem_buf *buffer;
67 	unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3);
68 	unsigned long offset;
69 
70 	DRM_DEBUG_KMS("%s\n", __FILE__);
71 
72 	drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
73 	drm_fb_helper_fill_var(fbi, helper, fb->width, fb->height);
74 
75 	/* RGB formats use only one buffer */
76 	buffer = exynos_drm_fb_buffer(fb, 0);
77 	if (!buffer) {
78 		DRM_LOG_KMS("buffer is null.\n");
79 		return -EFAULT;
80 	}
81 
82 	/* buffer count to framebuffer always is 1 at booting time. */
83 	exynos_drm_fb_set_buf_cnt(fb, 1);
84 
85 	offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
86 	offset += fbi->var.yoffset * fb->pitches[0];
87 
88 	dev->mode_config.fb_base = (resource_size_t)buffer->dma_addr;
89 	fbi->screen_base = buffer->kvaddr + offset;
90 	fbi->fix.smem_start = (unsigned long)(buffer->dma_addr + offset);
91 	fbi->screen_size = size;
92 	fbi->fix.smem_len = size;
93 
94 	return 0;
95 }
96 
97 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
98 				    struct drm_fb_helper_surface_size *sizes)
99 {
100 	struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
101 	struct exynos_drm_gem_obj *exynos_gem_obj;
102 	struct drm_device *dev = helper->dev;
103 	struct fb_info *fbi;
104 	struct drm_mode_fb_cmd2 mode_cmd = { 0 };
105 	struct platform_device *pdev = dev->platformdev;
106 	unsigned long size;
107 	int ret;
108 
109 	DRM_DEBUG_KMS("%s\n", __FILE__);
110 
111 	DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
112 			sizes->surface_width, sizes->surface_height,
113 			sizes->surface_bpp);
114 
115 	mode_cmd.width = sizes->surface_width;
116 	mode_cmd.height = sizes->surface_height;
117 	mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
118 	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
119 							  sizes->surface_depth);
120 
121 	mutex_lock(&dev->struct_mutex);
122 
123 	fbi = framebuffer_alloc(0, &pdev->dev);
124 	if (!fbi) {
125 		DRM_ERROR("failed to allocate fb info.\n");
126 		ret = -ENOMEM;
127 		goto out;
128 	}
129 
130 	size = mode_cmd.pitches[0] * mode_cmd.height;
131 
132 	/* 0 means to allocate physically continuous memory */
133 	exynos_gem_obj = exynos_drm_gem_create(dev, 0, size);
134 	if (IS_ERR(exynos_gem_obj)) {
135 		ret = PTR_ERR(exynos_gem_obj);
136 		goto out;
137 	}
138 
139 	exynos_fbdev->exynos_gem_obj = exynos_gem_obj;
140 
141 	helper->fb = exynos_drm_framebuffer_init(dev, &mode_cmd,
142 			&exynos_gem_obj->base);
143 	if (IS_ERR_OR_NULL(helper->fb)) {
144 		DRM_ERROR("failed to create drm framebuffer.\n");
145 		ret = PTR_ERR(helper->fb);
146 		goto out;
147 	}
148 
149 	helper->fbdev = fbi;
150 
151 	fbi->par = helper;
152 	fbi->flags = FBINFO_FLAG_DEFAULT;
153 	fbi->fbops = &exynos_drm_fb_ops;
154 
155 	ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
156 	if (ret) {
157 		DRM_ERROR("failed to allocate cmap.\n");
158 		goto out;
159 	}
160 
161 	ret = exynos_drm_fbdev_update(helper, helper->fb);
162 	if (ret < 0) {
163 		fb_dealloc_cmap(&fbi->cmap);
164 		goto out;
165 	}
166 
167 /*
168  * if failed, all resources allocated above would be released by
169  * drm_mode_config_cleanup() when drm_load() had been called prior
170  * to any specific driver such as fimd or hdmi driver.
171  */
172 out:
173 	mutex_unlock(&dev->struct_mutex);
174 	return ret;
175 }
176 
177 static int exynos_drm_fbdev_probe(struct drm_fb_helper *helper,
178 				   struct drm_fb_helper_surface_size *sizes)
179 {
180 	int ret = 0;
181 
182 	DRM_DEBUG_KMS("%s\n", __FILE__);
183 
184 	/*
185 	 * with !helper->fb, it means that this funcion is called first time
186 	 * and after that, the helper->fb would be used as clone mode.
187 	 */
188 	if (!helper->fb) {
189 		ret = exynos_drm_fbdev_create(helper, sizes);
190 		if (ret < 0) {
191 			DRM_ERROR("failed to create fbdev.\n");
192 			return ret;
193 		}
194 
195 		/*
196 		 * fb_helper expects a value more than 1 if succeed
197 		 * because register_framebuffer() should be called.
198 		 */
199 		ret = 1;
200 	}
201 
202 	return ret;
203 }
204 
205 static struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
206 	.fb_probe =	exynos_drm_fbdev_probe,
207 };
208 
209 int exynos_drm_fbdev_init(struct drm_device *dev)
210 {
211 	struct exynos_drm_fbdev *fbdev;
212 	struct exynos_drm_private *private = dev->dev_private;
213 	struct drm_fb_helper *helper;
214 	unsigned int num_crtc;
215 	int ret;
216 
217 	DRM_DEBUG_KMS("%s\n", __FILE__);
218 
219 	if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
220 		return 0;
221 
222 	fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
223 	if (!fbdev) {
224 		DRM_ERROR("failed to allocate drm fbdev.\n");
225 		return -ENOMEM;
226 	}
227 
228 	private->fb_helper = helper = &fbdev->drm_fb_helper;
229 	helper->funcs = &exynos_drm_fb_helper_funcs;
230 
231 	num_crtc = dev->mode_config.num_crtc;
232 
233 	ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
234 	if (ret < 0) {
235 		DRM_ERROR("failed to initialize drm fb helper.\n");
236 		goto err_init;
237 	}
238 
239 	ret = drm_fb_helper_single_add_all_connectors(helper);
240 	if (ret < 0) {
241 		DRM_ERROR("failed to register drm_fb_helper_connector.\n");
242 		goto err_setup;
243 
244 	}
245 
246 	ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
247 	if (ret < 0) {
248 		DRM_ERROR("failed to set up hw configuration.\n");
249 		goto err_setup;
250 	}
251 
252 	return 0;
253 
254 err_setup:
255 	drm_fb_helper_fini(helper);
256 
257 err_init:
258 	private->fb_helper = NULL;
259 	kfree(fbdev);
260 
261 	return ret;
262 }
263 
264 static void exynos_drm_fbdev_destroy(struct drm_device *dev,
265 				      struct drm_fb_helper *fb_helper)
266 {
267 	struct drm_framebuffer *fb;
268 
269 	/* release drm framebuffer and real buffer */
270 	if (fb_helper->fb && fb_helper->fb->funcs) {
271 		fb = fb_helper->fb;
272 		if (fb)
273 			drm_framebuffer_remove(fb);
274 	}
275 
276 	/* release linux framebuffer */
277 	if (fb_helper->fbdev) {
278 		struct fb_info *info;
279 		int ret;
280 
281 		info = fb_helper->fbdev;
282 		ret = unregister_framebuffer(info);
283 		if (ret < 0)
284 			DRM_DEBUG_KMS("failed unregister_framebuffer()\n");
285 
286 		if (info->cmap.len)
287 			fb_dealloc_cmap(&info->cmap);
288 
289 		framebuffer_release(info);
290 	}
291 
292 	drm_fb_helper_fini(fb_helper);
293 }
294 
295 void exynos_drm_fbdev_fini(struct drm_device *dev)
296 {
297 	struct exynos_drm_private *private = dev->dev_private;
298 	struct exynos_drm_fbdev *fbdev;
299 
300 	if (!private || !private->fb_helper)
301 		return;
302 
303 	fbdev = to_exynos_fbdev(private->fb_helper);
304 
305 	if (fbdev->exynos_gem_obj)
306 		exynos_drm_gem_destroy(fbdev->exynos_gem_obj);
307 
308 	exynos_drm_fbdev_destroy(dev, private->fb_helper);
309 	kfree(fbdev);
310 	private->fb_helper = NULL;
311 }
312 
313 void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
314 {
315 	struct exynos_drm_private *private = dev->dev_private;
316 
317 	if (!private || !private->fb_helper)
318 		return;
319 
320 	drm_fb_helper_restore_fbdev_mode(private->fb_helper);
321 }
322