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  * 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_fb_helper.h>
18 #include <drm/drm_crtc_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 #include "exynos_drm_iommu.h"
25 
26 #define MAX_CONNECTOR		4
27 #define PREFERRED_BPP		32
28 
29 #define to_exynos_fbdev(x)	container_of(x, struct exynos_drm_fbdev,\
30 				drm_fb_helper)
31 
32 struct exynos_drm_fbdev {
33 	struct drm_fb_helper	drm_fb_helper;
34 	struct exynos_drm_gem	*exynos_gem;
35 };
36 
37 static int exynos_drm_fb_mmap(struct fb_info *info,
38 			struct vm_area_struct *vma)
39 {
40 	struct drm_fb_helper *helper = info->par;
41 	struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper);
42 	struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem;
43 	unsigned long vm_size;
44 	int ret;
45 
46 	vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
47 
48 	vm_size = vma->vm_end - vma->vm_start;
49 
50 	if (vm_size > exynos_gem->size)
51 		return -EINVAL;
52 
53 	ret = dma_mmap_attrs(to_dma_dev(helper->dev), vma, exynos_gem->cookie,
54 			     exynos_gem->dma_addr, exynos_gem->size,
55 			     exynos_gem->dma_attrs);
56 	if (ret < 0) {
57 		DRM_ERROR("failed to mmap.\n");
58 		return ret;
59 	}
60 
61 	return 0;
62 }
63 
64 static struct fb_ops exynos_drm_fb_ops = {
65 	.owner		= THIS_MODULE,
66 	DRM_FB_HELPER_DEFAULT_OPS,
67 	.fb_mmap        = exynos_drm_fb_mmap,
68 	.fb_fillrect	= drm_fb_helper_cfb_fillrect,
69 	.fb_copyarea	= drm_fb_helper_cfb_copyarea,
70 	.fb_imageblit	= drm_fb_helper_cfb_imageblit,
71 };
72 
73 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
74 				   struct drm_fb_helper_surface_size *sizes,
75 				   struct exynos_drm_gem *exynos_gem)
76 {
77 	struct fb_info *fbi;
78 	struct drm_framebuffer *fb = helper->fb;
79 	unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3);
80 	unsigned int nr_pages;
81 	unsigned long offset;
82 
83 	fbi = drm_fb_helper_alloc_fbi(helper);
84 	if (IS_ERR(fbi)) {
85 		DRM_ERROR("failed to allocate fb info.\n");
86 		return PTR_ERR(fbi);
87 	}
88 
89 	fbi->par = helper;
90 	fbi->flags = FBINFO_FLAG_DEFAULT;
91 	fbi->fbops = &exynos_drm_fb_ops;
92 
93 	drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
94 	drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
95 
96 	nr_pages = exynos_gem->size >> PAGE_SHIFT;
97 
98 	exynos_gem->kvaddr = (void __iomem *) vmap(exynos_gem->pages, nr_pages,
99 				VM_MAP, pgprot_writecombine(PAGE_KERNEL));
100 	if (!exynos_gem->kvaddr) {
101 		DRM_ERROR("failed to map pages to kernel space.\n");
102 		drm_fb_helper_release_fbi(helper);
103 		return -EIO;
104 	}
105 
106 	offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
107 	offset += fbi->var.yoffset * fb->pitches[0];
108 
109 	fbi->screen_base = exynos_gem->kvaddr + offset;
110 	fbi->screen_size = size;
111 	fbi->fix.smem_len = size;
112 
113 	return 0;
114 }
115 
116 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
117 				    struct drm_fb_helper_surface_size *sizes)
118 {
119 	struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
120 	struct exynos_drm_gem *exynos_gem;
121 	struct drm_device *dev = helper->dev;
122 	struct drm_mode_fb_cmd2 mode_cmd = { 0 };
123 	struct platform_device *pdev = dev->platformdev;
124 	unsigned long size;
125 	int ret;
126 
127 	DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
128 			sizes->surface_width, sizes->surface_height,
129 			sizes->surface_bpp);
130 
131 	mode_cmd.width = sizes->surface_width;
132 	mode_cmd.height = sizes->surface_height;
133 	mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
134 	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
135 							  sizes->surface_depth);
136 
137 	size = mode_cmd.pitches[0] * mode_cmd.height;
138 
139 	exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size);
140 	/*
141 	 * If physically contiguous memory allocation fails and if IOMMU is
142 	 * supported then try to get buffer from non physically contiguous
143 	 * memory area.
144 	 */
145 	if (IS_ERR(exynos_gem) && is_drm_iommu_supported(dev)) {
146 		dev_warn(&pdev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n");
147 		exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG,
148 						   size);
149 	}
150 
151 	if (IS_ERR(exynos_gem))
152 		return PTR_ERR(exynos_gem);
153 
154 	exynos_fbdev->exynos_gem = exynos_gem;
155 
156 	helper->fb =
157 		exynos_drm_framebuffer_init(dev, &mode_cmd, &exynos_gem, 1);
158 	if (IS_ERR(helper->fb)) {
159 		DRM_ERROR("failed to create drm framebuffer.\n");
160 		ret = PTR_ERR(helper->fb);
161 		goto err_destroy_gem;
162 	}
163 
164 	ret = exynos_drm_fbdev_update(helper, sizes, exynos_gem);
165 	if (ret < 0)
166 		goto err_destroy_framebuffer;
167 
168 	return ret;
169 
170 err_destroy_framebuffer:
171 	drm_framebuffer_cleanup(helper->fb);
172 err_destroy_gem:
173 	exynos_drm_gem_destroy(exynos_gem);
174 
175 	/*
176 	 * if failed, all resources allocated above would be released by
177 	 * drm_mode_config_cleanup() when drm_load() had been called prior
178 	 * to any specific driver such as fimd or hdmi driver.
179 	 */
180 
181 	return ret;
182 }
183 
184 static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
185 	.fb_probe =	exynos_drm_fbdev_create,
186 };
187 
188 static bool exynos_drm_fbdev_is_anything_connected(struct drm_device *dev)
189 {
190 	struct drm_connector *connector;
191 	bool ret = false;
192 
193 	mutex_lock(&dev->mode_config.mutex);
194 	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
195 		if (connector->status != connector_status_connected)
196 			continue;
197 
198 		ret = true;
199 		break;
200 	}
201 	mutex_unlock(&dev->mode_config.mutex);
202 
203 	return ret;
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 	if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
215 		return 0;
216 
217 	if (!exynos_drm_fbdev_is_anything_connected(dev))
218 		return 0;
219 
220 	fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
221 	if (!fbdev)
222 		return -ENOMEM;
223 
224 	private->fb_helper = helper = &fbdev->drm_fb_helper;
225 
226 	drm_fb_helper_prepare(dev, helper, &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 exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper);
265 	struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem;
266 	struct drm_framebuffer *fb;
267 
268 	vunmap(exynos_gem->kvaddr);
269 
270 	/* release drm framebuffer and real buffer */
271 	if (fb_helper->fb && fb_helper->fb->funcs) {
272 		fb = fb_helper->fb;
273 		if (fb) {
274 			drm_framebuffer_unregister_private(fb);
275 			drm_framebuffer_remove(fb);
276 		}
277 	}
278 
279 	drm_fb_helper_unregister_fbi(fb_helper);
280 	drm_fb_helper_release_fbi(fb_helper);
281 
282 	drm_fb_helper_fini(fb_helper);
283 }
284 
285 void exynos_drm_fbdev_fini(struct drm_device *dev)
286 {
287 	struct exynos_drm_private *private = dev->dev_private;
288 	struct exynos_drm_fbdev *fbdev;
289 
290 	if (!private || !private->fb_helper)
291 		return;
292 
293 	fbdev = to_exynos_fbdev(private->fb_helper);
294 
295 	exynos_drm_fbdev_destroy(dev, private->fb_helper);
296 	kfree(fbdev);
297 	private->fb_helper = NULL;
298 }
299 
300 void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
301 {
302 	struct exynos_drm_private *private = dev->dev_private;
303 
304 	if (!private || !private->fb_helper)
305 		return;
306 
307 	drm_fb_helper_restore_fbdev_mode_unlocked(private->fb_helper);
308 }
309 
310 void exynos_drm_output_poll_changed(struct drm_device *dev)
311 {
312 	struct exynos_drm_private *private = dev->dev_private;
313 	struct drm_fb_helper *fb_helper = private->fb_helper;
314 
315 	if (fb_helper)
316 		drm_fb_helper_hotplug_event(fb_helper);
317 	else
318 		exynos_drm_fbdev_init(dev);
319 }
320