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(helper->dev->dev, vma, exynos_gem->pages,
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 	.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 	.fb_check_var	= drm_fb_helper_check_var,
71 	.fb_set_par	= drm_fb_helper_set_par,
72 	.fb_blank	= drm_fb_helper_blank,
73 	.fb_pan_display	= drm_fb_helper_pan_display,
74 	.fb_setcmap	= drm_fb_helper_setcmap,
75 };
76 
77 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
78 				   struct drm_fb_helper_surface_size *sizes,
79 				   struct exynos_drm_gem *exynos_gem)
80 {
81 	struct fb_info *fbi;
82 	struct drm_framebuffer *fb = helper->fb;
83 	unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3);
84 	unsigned int nr_pages;
85 	unsigned long offset;
86 
87 	fbi = drm_fb_helper_alloc_fbi(helper);
88 	if (IS_ERR(fbi)) {
89 		DRM_ERROR("failed to allocate fb info.\n");
90 		return PTR_ERR(fbi);
91 	}
92 
93 	fbi->par = helper;
94 	fbi->flags = FBINFO_FLAG_DEFAULT;
95 	fbi->fbops = &exynos_drm_fb_ops;
96 
97 	drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
98 	drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
99 
100 	nr_pages = exynos_gem->size >> PAGE_SHIFT;
101 
102 	exynos_gem->kvaddr = (void __iomem *) vmap(exynos_gem->pages, nr_pages,
103 				VM_MAP, pgprot_writecombine(PAGE_KERNEL));
104 	if (!exynos_gem->kvaddr) {
105 		DRM_ERROR("failed to map pages to kernel space.\n");
106 		drm_fb_helper_release_fbi(helper);
107 		return -EIO;
108 	}
109 
110 	offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
111 	offset += fbi->var.yoffset * fb->pitches[0];
112 
113 	fbi->screen_base = exynos_gem->kvaddr + offset;
114 	fbi->screen_size = size;
115 	fbi->fix.smem_len = size;
116 
117 	return 0;
118 }
119 
120 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
121 				    struct drm_fb_helper_surface_size *sizes)
122 {
123 	struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
124 	struct exynos_drm_gem *exynos_gem;
125 	struct drm_device *dev = helper->dev;
126 	struct drm_mode_fb_cmd2 mode_cmd = { 0 };
127 	struct platform_device *pdev = dev->platformdev;
128 	unsigned long size;
129 	int ret;
130 
131 	DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
132 			sizes->surface_width, sizes->surface_height,
133 			sizes->surface_bpp);
134 
135 	mode_cmd.width = sizes->surface_width;
136 	mode_cmd.height = sizes->surface_height;
137 	mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
138 	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
139 							  sizes->surface_depth);
140 
141 	mutex_lock(&dev->struct_mutex);
142 
143 	size = mode_cmd.pitches[0] * mode_cmd.height;
144 
145 	exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size);
146 	/*
147 	 * If physically contiguous memory allocation fails and if IOMMU is
148 	 * supported then try to get buffer from non physically contiguous
149 	 * memory area.
150 	 */
151 	if (IS_ERR(exynos_gem) && is_drm_iommu_supported(dev)) {
152 		dev_warn(&pdev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n");
153 		exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG,
154 						   size);
155 	}
156 
157 	if (IS_ERR(exynos_gem)) {
158 		ret = PTR_ERR(exynos_gem);
159 		goto out;
160 	}
161 
162 	exynos_fbdev->exynos_gem = exynos_gem;
163 
164 	helper->fb =
165 		exynos_drm_framebuffer_init(dev, &mode_cmd, &exynos_gem, 1);
166 	if (IS_ERR(helper->fb)) {
167 		DRM_ERROR("failed to create drm framebuffer.\n");
168 		ret = PTR_ERR(helper->fb);
169 		goto err_destroy_gem;
170 	}
171 
172 	ret = exynos_drm_fbdev_update(helper, sizes, exynos_gem);
173 	if (ret < 0)
174 		goto err_destroy_framebuffer;
175 
176 	mutex_unlock(&dev->struct_mutex);
177 	return ret;
178 
179 err_destroy_framebuffer:
180 	drm_framebuffer_cleanup(helper->fb);
181 err_destroy_gem:
182 	exynos_drm_gem_destroy(exynos_gem);
183 
184 /*
185  * if failed, all resources allocated above would be released by
186  * drm_mode_config_cleanup() when drm_load() had been called prior
187  * to any specific driver such as fimd or hdmi driver.
188  */
189 out:
190 	mutex_unlock(&dev->struct_mutex);
191 	return ret;
192 }
193 
194 static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
195 	.fb_probe =	exynos_drm_fbdev_create,
196 };
197 
198 static bool exynos_drm_fbdev_is_anything_connected(struct drm_device *dev)
199 {
200 	struct drm_connector *connector;
201 	bool ret = false;
202 
203 	mutex_lock(&dev->mode_config.mutex);
204 	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
205 		if (connector->status != connector_status_connected)
206 			continue;
207 
208 		ret = true;
209 		break;
210 	}
211 	mutex_unlock(&dev->mode_config.mutex);
212 
213 	return ret;
214 }
215 
216 int exynos_drm_fbdev_init(struct drm_device *dev)
217 {
218 	struct exynos_drm_fbdev *fbdev;
219 	struct exynos_drm_private *private = dev->dev_private;
220 	struct drm_fb_helper *helper;
221 	unsigned int num_crtc;
222 	int ret;
223 
224 	if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
225 		return 0;
226 
227 	if (!exynos_drm_fbdev_is_anything_connected(dev))
228 		return 0;
229 
230 	fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
231 	if (!fbdev)
232 		return -ENOMEM;
233 
234 	private->fb_helper = helper = &fbdev->drm_fb_helper;
235 
236 	drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs);
237 
238 	num_crtc = dev->mode_config.num_crtc;
239 
240 	ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
241 	if (ret < 0) {
242 		DRM_ERROR("failed to initialize drm fb helper.\n");
243 		goto err_init;
244 	}
245 
246 	ret = drm_fb_helper_single_add_all_connectors(helper);
247 	if (ret < 0) {
248 		DRM_ERROR("failed to register drm_fb_helper_connector.\n");
249 		goto err_setup;
250 
251 	}
252 
253 	ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
254 	if (ret < 0) {
255 		DRM_ERROR("failed to set up hw configuration.\n");
256 		goto err_setup;
257 	}
258 
259 	return 0;
260 
261 err_setup:
262 	drm_fb_helper_fini(helper);
263 
264 err_init:
265 	private->fb_helper = NULL;
266 	kfree(fbdev);
267 
268 	return ret;
269 }
270 
271 static void exynos_drm_fbdev_destroy(struct drm_device *dev,
272 				      struct drm_fb_helper *fb_helper)
273 {
274 	struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper);
275 	struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem;
276 	struct drm_framebuffer *fb;
277 
278 	if (exynos_gem->kvaddr)
279 		vunmap(exynos_gem->kvaddr);
280 
281 	/* release drm framebuffer and real buffer */
282 	if (fb_helper->fb && fb_helper->fb->funcs) {
283 		fb = fb_helper->fb;
284 		if (fb) {
285 			drm_framebuffer_unregister_private(fb);
286 			drm_framebuffer_remove(fb);
287 		}
288 	}
289 
290 	drm_fb_helper_unregister_fbi(fb_helper);
291 	drm_fb_helper_release_fbi(fb_helper);
292 
293 	drm_fb_helper_fini(fb_helper);
294 }
295 
296 void exynos_drm_fbdev_fini(struct drm_device *dev)
297 {
298 	struct exynos_drm_private *private = dev->dev_private;
299 	struct exynos_drm_fbdev *fbdev;
300 
301 	if (!private || !private->fb_helper)
302 		return;
303 
304 	fbdev = to_exynos_fbdev(private->fb_helper);
305 
306 	exynos_drm_fbdev_destroy(dev, private->fb_helper);
307 	kfree(fbdev);
308 	private->fb_helper = NULL;
309 }
310 
311 void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
312 {
313 	struct exynos_drm_private *private = dev->dev_private;
314 
315 	if (!private || !private->fb_helper)
316 		return;
317 
318 	drm_fb_helper_restore_fbdev_mode_unlocked(private->fb_helper);
319 }
320