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 "drmP.h"
30 #include "drm_crtc.h"
31 #include "drm_fb_helper.h"
32 #include "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 	offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
83 	offset += fbi->var.yoffset * fb->pitches[0];
84 
85 	dev->mode_config.fb_base = (resource_size_t)buffer->dma_addr;
86 	fbi->screen_base = buffer->kvaddr + offset;
87 	fbi->fix.smem_start = (unsigned long)(buffer->dma_addr + offset);
88 	fbi->screen_size = size;
89 	fbi->fix.smem_len = size;
90 
91 	return 0;
92 }
93 
94 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
95 				    struct drm_fb_helper_surface_size *sizes)
96 {
97 	struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
98 	struct exynos_drm_gem_obj *exynos_gem_obj;
99 	struct drm_device *dev = helper->dev;
100 	struct fb_info *fbi;
101 	struct drm_mode_fb_cmd2 mode_cmd = { 0 };
102 	struct platform_device *pdev = dev->platformdev;
103 	unsigned long size;
104 	int ret;
105 
106 	DRM_DEBUG_KMS("%s\n", __FILE__);
107 
108 	DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
109 			sizes->surface_width, sizes->surface_height,
110 			sizes->surface_bpp);
111 
112 	mode_cmd.width = sizes->surface_width;
113 	mode_cmd.height = sizes->surface_height;
114 	mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
115 	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
116 							  sizes->surface_depth);
117 
118 	mutex_lock(&dev->struct_mutex);
119 
120 	fbi = framebuffer_alloc(0, &pdev->dev);
121 	if (!fbi) {
122 		DRM_ERROR("failed to allocate fb info.\n");
123 		ret = -ENOMEM;
124 		goto out;
125 	}
126 
127 	size = mode_cmd.pitches[0] * mode_cmd.height;
128 
129 	/* 0 means to allocate physically continuous memory */
130 	exynos_gem_obj = exynos_drm_gem_create(dev, 0, size);
131 	if (IS_ERR(exynos_gem_obj)) {
132 		ret = PTR_ERR(exynos_gem_obj);
133 		goto out;
134 	}
135 
136 	exynos_fbdev->exynos_gem_obj = exynos_gem_obj;
137 
138 	helper->fb = exynos_drm_framebuffer_init(dev, &mode_cmd,
139 			&exynos_gem_obj->base);
140 	if (IS_ERR_OR_NULL(helper->fb)) {
141 		DRM_ERROR("failed to create drm framebuffer.\n");
142 		ret = PTR_ERR(helper->fb);
143 		goto out;
144 	}
145 
146 	helper->fbdev = fbi;
147 
148 	fbi->par = helper;
149 	fbi->flags = FBINFO_FLAG_DEFAULT;
150 	fbi->fbops = &exynos_drm_fb_ops;
151 
152 	ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
153 	if (ret) {
154 		DRM_ERROR("failed to allocate cmap.\n");
155 		goto out;
156 	}
157 
158 	ret = exynos_drm_fbdev_update(helper, helper->fb);
159 	if (ret < 0) {
160 		fb_dealloc_cmap(&fbi->cmap);
161 		goto out;
162 	}
163 
164 /*
165  * if failed, all resources allocated above would be released by
166  * drm_mode_config_cleanup() when drm_load() had been called prior
167  * to any specific driver such as fimd or hdmi driver.
168  */
169 out:
170 	mutex_unlock(&dev->struct_mutex);
171 	return ret;
172 }
173 
174 static int exynos_drm_fbdev_probe(struct drm_fb_helper *helper,
175 				   struct drm_fb_helper_surface_size *sizes)
176 {
177 	int ret = 0;
178 
179 	DRM_DEBUG_KMS("%s\n", __FILE__);
180 
181 	/*
182 	 * with !helper->fb, it means that this funcion is called first time
183 	 * and after that, the helper->fb would be used as clone mode.
184 	 */
185 	if (!helper->fb) {
186 		ret = exynos_drm_fbdev_create(helper, sizes);
187 		if (ret < 0) {
188 			DRM_ERROR("failed to create fbdev.\n");
189 			return ret;
190 		}
191 
192 		/*
193 		 * fb_helper expects a value more than 1 if succeed
194 		 * because register_framebuffer() should be called.
195 		 */
196 		ret = 1;
197 	}
198 
199 	return ret;
200 }
201 
202 static struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
203 	.fb_probe =	exynos_drm_fbdev_probe,
204 };
205 
206 int exynos_drm_fbdev_init(struct drm_device *dev)
207 {
208 	struct exynos_drm_fbdev *fbdev;
209 	struct exynos_drm_private *private = dev->dev_private;
210 	struct drm_fb_helper *helper;
211 	unsigned int num_crtc;
212 	int ret;
213 
214 	DRM_DEBUG_KMS("%s\n", __FILE__);
215 
216 	if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
217 		return 0;
218 
219 	fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
220 	if (!fbdev) {
221 		DRM_ERROR("failed to allocate drm fbdev.\n");
222 		return -ENOMEM;
223 	}
224 
225 	private->fb_helper = helper = &fbdev->drm_fb_helper;
226 	helper->funcs = &exynos_drm_fb_helper_funcs;
227 
228 	num_crtc = dev->mode_config.num_crtc;
229 
230 	ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
231 	if (ret < 0) {
232 		DRM_ERROR("failed to initialize drm fb helper.\n");
233 		goto err_init;
234 	}
235 
236 	ret = drm_fb_helper_single_add_all_connectors(helper);
237 	if (ret < 0) {
238 		DRM_ERROR("failed to register drm_fb_helper_connector.\n");
239 		goto err_setup;
240 
241 	}
242 
243 	ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
244 	if (ret < 0) {
245 		DRM_ERROR("failed to set up hw configuration.\n");
246 		goto err_setup;
247 	}
248 
249 	return 0;
250 
251 err_setup:
252 	drm_fb_helper_fini(helper);
253 
254 err_init:
255 	private->fb_helper = NULL;
256 	kfree(fbdev);
257 
258 	return ret;
259 }
260 
261 static void exynos_drm_fbdev_destroy(struct drm_device *dev,
262 				      struct drm_fb_helper *fb_helper)
263 {
264 	struct drm_framebuffer *fb;
265 
266 	/* release drm framebuffer and real buffer */
267 	if (fb_helper->fb && fb_helper->fb->funcs) {
268 		fb = fb_helper->fb;
269 		if (fb && fb->funcs->destroy)
270 			fb->funcs->destroy(fb);
271 	}
272 
273 	/* release linux framebuffer */
274 	if (fb_helper->fbdev) {
275 		struct fb_info *info;
276 		int ret;
277 
278 		info = fb_helper->fbdev;
279 		ret = unregister_framebuffer(info);
280 		if (ret < 0)
281 			DRM_DEBUG_KMS("failed unregister_framebuffer()\n");
282 
283 		if (info->cmap.len)
284 			fb_dealloc_cmap(&info->cmap);
285 
286 		framebuffer_release(info);
287 	}
288 
289 	drm_fb_helper_fini(fb_helper);
290 }
291 
292 void exynos_drm_fbdev_fini(struct drm_device *dev)
293 {
294 	struct exynos_drm_private *private = dev->dev_private;
295 	struct exynos_drm_fbdev *fbdev;
296 
297 	if (!private || !private->fb_helper)
298 		return;
299 
300 	fbdev = to_exynos_fbdev(private->fb_helper);
301 
302 	if (fbdev->exynos_gem_obj)
303 		exynos_drm_gem_destroy(fbdev->exynos_gem_obj);
304 
305 	exynos_drm_fbdev_destroy(dev, private->fb_helper);
306 	kfree(fbdev);
307 	private->fb_helper = NULL;
308 }
309 
310 void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
311 {
312 	struct exynos_drm_private *private = dev->dev_private;
313 
314 	if (!private || !private->fb_helper)
315 		return;
316 
317 	drm_fb_helper_restore_fbdev_mode(private->fb_helper);
318 }
319