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_probe_helper.h>
19 #include <drm/exynos_drm.h>
20 
21 #include <linux/console.h>
22 
23 #include "exynos_drm_drv.h"
24 #include "exynos_drm_fb.h"
25 #include "exynos_drm_fbdev.h"
26 
27 #define MAX_CONNECTOR		4
28 #define PREFERRED_BPP		32
29 
30 #define to_exynos_fbdev(x)	container_of(x, struct exynos_drm_fbdev,\
31 				drm_fb_helper)
32 
33 struct exynos_drm_fbdev {
34 	struct drm_fb_helper	drm_fb_helper;
35 	struct exynos_drm_gem	*exynos_gem;
36 };
37 
38 static int exynos_drm_fb_mmap(struct fb_info *info,
39 			struct vm_area_struct *vma)
40 {
41 	struct drm_fb_helper *helper = info->par;
42 	struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper);
43 	struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem;
44 	unsigned long vm_size;
45 	int ret;
46 
47 	vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
48 
49 	vm_size = vma->vm_end - vma->vm_start;
50 
51 	if (vm_size > exynos_gem->size)
52 		return -EINVAL;
53 
54 	ret = dma_mmap_attrs(to_dma_dev(helper->dev), vma, exynos_gem->cookie,
55 			     exynos_gem->dma_addr, exynos_gem->size,
56 			     exynos_gem->dma_attrs);
57 	if (ret < 0) {
58 		DRM_ERROR("failed to mmap.\n");
59 		return ret;
60 	}
61 
62 	return 0;
63 }
64 
65 static struct fb_ops exynos_drm_fb_ops = {
66 	.owner		= THIS_MODULE,
67 	DRM_FB_HELPER_DEFAULT_OPS,
68 	.fb_mmap        = exynos_drm_fb_mmap,
69 	.fb_fillrect	= drm_fb_helper_cfb_fillrect,
70 	.fb_copyarea	= drm_fb_helper_cfb_copyarea,
71 	.fb_imageblit	= drm_fb_helper_cfb_imageblit,
72 };
73 
74 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
75 				   struct drm_fb_helper_surface_size *sizes,
76 				   struct exynos_drm_gem *exynos_gem)
77 {
78 	struct fb_info *fbi;
79 	struct drm_framebuffer *fb = helper->fb;
80 	unsigned int size = fb->width * fb->height * fb->format->cpp[0];
81 	unsigned int nr_pages;
82 	unsigned long offset;
83 
84 	fbi = drm_fb_helper_alloc_fbi(helper);
85 	if (IS_ERR(fbi)) {
86 		DRM_ERROR("failed to allocate fb info.\n");
87 		return PTR_ERR(fbi);
88 	}
89 
90 	fbi->fbops = &exynos_drm_fb_ops;
91 
92 	drm_fb_helper_fill_info(fbi, helper, sizes);
93 
94 	nr_pages = exynos_gem->size >> PAGE_SHIFT;
95 
96 	exynos_gem->kvaddr = (void __iomem *) vmap(exynos_gem->pages, nr_pages,
97 				VM_MAP, pgprot_writecombine(PAGE_KERNEL));
98 	if (!exynos_gem->kvaddr) {
99 		DRM_ERROR("failed to map pages to kernel space.\n");
100 		return -EIO;
101 	}
102 
103 	offset = fbi->var.xoffset * fb->format->cpp[0];
104 	offset += fbi->var.yoffset * fb->pitches[0];
105 
106 	fbi->screen_base = exynos_gem->kvaddr + offset;
107 	fbi->screen_size = size;
108 	fbi->fix.smem_len = size;
109 
110 	return 0;
111 }
112 
113 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
114 				    struct drm_fb_helper_surface_size *sizes)
115 {
116 	struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
117 	struct exynos_drm_gem *exynos_gem;
118 	struct drm_device *dev = helper->dev;
119 	struct drm_mode_fb_cmd2 mode_cmd = { 0 };
120 	unsigned long size;
121 	int ret;
122 
123 	DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
124 			sizes->surface_width, sizes->surface_height,
125 			sizes->surface_bpp);
126 
127 	mode_cmd.width = sizes->surface_width;
128 	mode_cmd.height = sizes->surface_height;
129 	mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
130 	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
131 							  sizes->surface_depth);
132 
133 	size = mode_cmd.pitches[0] * mode_cmd.height;
134 
135 	exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size);
136 	/*
137 	 * If physically contiguous memory allocation fails and if IOMMU is
138 	 * supported then try to get buffer from non physically contiguous
139 	 * memory area.
140 	 */
141 	if (IS_ERR(exynos_gem) && is_drm_iommu_supported(dev)) {
142 		dev_warn(dev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n");
143 		exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG,
144 						   size);
145 	}
146 
147 	if (IS_ERR(exynos_gem))
148 		return PTR_ERR(exynos_gem);
149 
150 	exynos_fbdev->exynos_gem = exynos_gem;
151 
152 	helper->fb =
153 		exynos_drm_framebuffer_init(dev, &mode_cmd, &exynos_gem, 1);
154 	if (IS_ERR(helper->fb)) {
155 		DRM_ERROR("failed to create drm framebuffer.\n");
156 		ret = PTR_ERR(helper->fb);
157 		goto err_destroy_gem;
158 	}
159 
160 	ret = exynos_drm_fbdev_update(helper, sizes, exynos_gem);
161 	if (ret < 0)
162 		goto err_destroy_framebuffer;
163 
164 	return ret;
165 
166 err_destroy_framebuffer:
167 	drm_framebuffer_cleanup(helper->fb);
168 err_destroy_gem:
169 	exynos_drm_gem_destroy(exynos_gem);
170 
171 	/*
172 	 * if failed, all resources allocated above would be released by
173 	 * drm_mode_config_cleanup() when drm_load() had been called prior
174 	 * to any specific driver such as fimd or hdmi driver.
175 	 */
176 
177 	return ret;
178 }
179 
180 static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
181 	.fb_probe =	exynos_drm_fbdev_create,
182 };
183 
184 int exynos_drm_fbdev_init(struct drm_device *dev)
185 {
186 	struct exynos_drm_fbdev *fbdev;
187 	struct exynos_drm_private *private = dev->dev_private;
188 	struct drm_fb_helper *helper;
189 	int ret;
190 
191 	if (!dev->mode_config.num_crtc)
192 		return 0;
193 
194 	fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
195 	if (!fbdev)
196 		return -ENOMEM;
197 
198 	private->fb_helper = helper = &fbdev->drm_fb_helper;
199 
200 	drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs);
201 
202 	ret = drm_fb_helper_init(dev, helper, MAX_CONNECTOR);
203 	if (ret < 0) {
204 		DRM_ERROR("failed to initialize drm fb helper.\n");
205 		goto err_init;
206 	}
207 
208 	ret = drm_fb_helper_single_add_all_connectors(helper);
209 	if (ret < 0) {
210 		DRM_ERROR("failed to register drm_fb_helper_connector.\n");
211 		goto err_setup;
212 
213 	}
214 
215 	ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
216 	if (ret < 0) {
217 		DRM_ERROR("failed to set up hw configuration.\n");
218 		goto err_setup;
219 	}
220 
221 	return 0;
222 
223 err_setup:
224 	drm_fb_helper_fini(helper);
225 
226 err_init:
227 	private->fb_helper = NULL;
228 	kfree(fbdev);
229 
230 	return ret;
231 }
232 
233 static void exynos_drm_fbdev_destroy(struct drm_device *dev,
234 				      struct drm_fb_helper *fb_helper)
235 {
236 	struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper);
237 	struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem;
238 	struct drm_framebuffer *fb;
239 
240 	vunmap(exynos_gem->kvaddr);
241 
242 	/* release drm framebuffer and real buffer */
243 	if (fb_helper->fb && fb_helper->fb->funcs) {
244 		fb = fb_helper->fb;
245 		if (fb)
246 			drm_framebuffer_remove(fb);
247 	}
248 
249 	drm_fb_helper_unregister_fbi(fb_helper);
250 
251 	drm_fb_helper_fini(fb_helper);
252 }
253 
254 void exynos_drm_fbdev_fini(struct drm_device *dev)
255 {
256 	struct exynos_drm_private *private = dev->dev_private;
257 	struct exynos_drm_fbdev *fbdev;
258 
259 	if (!private || !private->fb_helper)
260 		return;
261 
262 	fbdev = to_exynos_fbdev(private->fb_helper);
263 
264 	exynos_drm_fbdev_destroy(dev, private->fb_helper);
265 	kfree(fbdev);
266 	private->fb_helper = NULL;
267 }
268 
269