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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_gem.h"
25 #include "exynos_drm_iommu.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_obj	*exynos_gem_obj;
36 };
37 
exynos_drm_fb_mmap(struct fb_info * info,struct vm_area_struct * vma)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_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj;
44 	struct exynos_drm_gem_buf *buffer = exynos_gem_obj->buffer;
45 	unsigned long vm_size;
46 	int ret;
47 
48 	vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
49 
50 	vm_size = vma->vm_end - vma->vm_start;
51 
52 	if (vm_size > buffer->size)
53 		return -EINVAL;
54 
55 	ret = dma_mmap_attrs(helper->dev->dev, vma, buffer->pages,
56 		buffer->dma_addr, buffer->size, &buffer->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 	.fb_mmap        = exynos_drm_fb_mmap,
68 	.fb_fillrect	= cfb_fillrect,
69 	.fb_copyarea	= cfb_copyarea,
70 	.fb_imageblit	= cfb_imageblit,
71 	.fb_check_var	= drm_fb_helper_check_var,
72 	.fb_set_par	= drm_fb_helper_set_par,
73 	.fb_blank	= drm_fb_helper_blank,
74 	.fb_pan_display	= drm_fb_helper_pan_display,
75 	.fb_setcmap	= drm_fb_helper_setcmap,
76 };
77 
exynos_drm_fbdev_update(struct drm_fb_helper * helper,struct drm_framebuffer * fb)78 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
79 				     struct drm_framebuffer *fb)
80 {
81 	struct fb_info *fbi = helper->fbdev;
82 	struct drm_device *dev = helper->dev;
83 	struct exynos_drm_gem_buf *buffer;
84 	unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3);
85 	unsigned long offset;
86 
87 	drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
88 	drm_fb_helper_fill_var(fbi, helper, fb->width, fb->height);
89 
90 	/* RGB formats use only one buffer */
91 	buffer = exynos_drm_fb_buffer(fb, 0);
92 	if (!buffer) {
93 		DRM_DEBUG_KMS("buffer is null.\n");
94 		return -EFAULT;
95 	}
96 
97 	/* map pages with kernel virtual space. */
98 	if (!buffer->kvaddr) {
99 		if (is_drm_iommu_supported(dev)) {
100 			unsigned int nr_pages = buffer->size >> PAGE_SHIFT;
101 
102 			buffer->kvaddr = (void __iomem *) vmap(buffer->pages,
103 					nr_pages, VM_MAP,
104 					pgprot_writecombine(PAGE_KERNEL));
105 		} else {
106 			phys_addr_t dma_addr = buffer->dma_addr;
107 			if (dma_addr)
108 				buffer->kvaddr = (void __iomem *)phys_to_virt(dma_addr);
109 			else
110 				buffer->kvaddr = (void __iomem *)NULL;
111 		}
112 		if (!buffer->kvaddr) {
113 			DRM_ERROR("failed to map pages to kernel space.\n");
114 			return -EIO;
115 		}
116 	}
117 
118 	/* buffer count to framebuffer always is 1 at booting time. */
119 	exynos_drm_fb_set_buf_cnt(fb, 1);
120 
121 	offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
122 	offset += fbi->var.yoffset * fb->pitches[0];
123 
124 	fbi->screen_base = buffer->kvaddr + offset;
125 	fbi->screen_size = size;
126 	fbi->fix.smem_len = size;
127 
128 	return 0;
129 }
130 
exynos_drm_fbdev_create(struct drm_fb_helper * helper,struct drm_fb_helper_surface_size * sizes)131 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
132 				    struct drm_fb_helper_surface_size *sizes)
133 {
134 	struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
135 	struct exynos_drm_gem_obj *exynos_gem_obj;
136 	struct drm_device *dev = helper->dev;
137 	struct fb_info *fbi;
138 	struct drm_mode_fb_cmd2 mode_cmd = { 0 };
139 	struct platform_device *pdev = dev->platformdev;
140 	unsigned long size;
141 	int ret;
142 
143 	DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
144 			sizes->surface_width, sizes->surface_height,
145 			sizes->surface_bpp);
146 
147 	mode_cmd.width = sizes->surface_width;
148 	mode_cmd.height = sizes->surface_height;
149 	mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
150 	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
151 							  sizes->surface_depth);
152 
153 	mutex_lock(&dev->struct_mutex);
154 
155 	fbi = framebuffer_alloc(0, &pdev->dev);
156 	if (!fbi) {
157 		DRM_ERROR("failed to allocate fb info.\n");
158 		ret = -ENOMEM;
159 		goto out;
160 	}
161 
162 	size = mode_cmd.pitches[0] * mode_cmd.height;
163 
164 	exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size);
165 	/*
166 	 * If physically contiguous memory allocation fails and if IOMMU is
167 	 * supported then try to get buffer from non physically contiguous
168 	 * memory area.
169 	 */
170 	if (IS_ERR(exynos_gem_obj) && is_drm_iommu_supported(dev)) {
171 		dev_warn(&pdev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n");
172 		exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG,
173 							size);
174 	}
175 
176 	if (IS_ERR(exynos_gem_obj)) {
177 		ret = PTR_ERR(exynos_gem_obj);
178 		goto err_release_framebuffer;
179 	}
180 
181 	exynos_fbdev->exynos_gem_obj = exynos_gem_obj;
182 
183 	helper->fb = exynos_drm_framebuffer_init(dev, &mode_cmd,
184 			&exynos_gem_obj->base);
185 	if (IS_ERR(helper->fb)) {
186 		DRM_ERROR("failed to create drm framebuffer.\n");
187 		ret = PTR_ERR(helper->fb);
188 		goto err_destroy_gem;
189 	}
190 
191 	helper->fbdev = fbi;
192 
193 	fbi->par = helper;
194 	fbi->flags = FBINFO_FLAG_DEFAULT;
195 	fbi->fbops = &exynos_drm_fb_ops;
196 
197 	ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
198 	if (ret) {
199 		DRM_ERROR("failed to allocate cmap.\n");
200 		goto err_destroy_framebuffer;
201 	}
202 
203 	ret = exynos_drm_fbdev_update(helper, helper->fb);
204 	if (ret < 0)
205 		goto err_dealloc_cmap;
206 
207 	mutex_unlock(&dev->struct_mutex);
208 	return ret;
209 
210 err_dealloc_cmap:
211 	fb_dealloc_cmap(&fbi->cmap);
212 err_destroy_framebuffer:
213 	drm_framebuffer_cleanup(helper->fb);
214 err_destroy_gem:
215 	exynos_drm_gem_destroy(exynos_gem_obj);
216 err_release_framebuffer:
217 	framebuffer_release(fbi);
218 
219 /*
220  * if failed, all resources allocated above would be released by
221  * drm_mode_config_cleanup() when drm_load() had been called prior
222  * to any specific driver such as fimd or hdmi driver.
223  */
224 out:
225 	mutex_unlock(&dev->struct_mutex);
226 	return ret;
227 }
228 
229 static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
230 	.fb_probe =	exynos_drm_fbdev_create,
231 };
232 
exynos_drm_fbdev_is_anything_connected(struct drm_device * dev)233 static bool exynos_drm_fbdev_is_anything_connected(struct drm_device *dev)
234 {
235 	struct drm_connector *connector;
236 	bool ret = false;
237 
238 	mutex_lock(&dev->mode_config.mutex);
239 	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
240 		if (connector->status != connector_status_connected)
241 			continue;
242 
243 		ret = true;
244 		break;
245 	}
246 	mutex_unlock(&dev->mode_config.mutex);
247 
248 	return ret;
249 }
250 
exynos_drm_fbdev_init(struct drm_device * dev)251 int exynos_drm_fbdev_init(struct drm_device *dev)
252 {
253 	struct exynos_drm_fbdev *fbdev;
254 	struct exynos_drm_private *private = dev->dev_private;
255 	struct drm_fb_helper *helper;
256 	unsigned int num_crtc;
257 	int ret;
258 
259 	if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
260 		return 0;
261 
262 	if (!exynos_drm_fbdev_is_anything_connected(dev))
263 		return 0;
264 
265 	fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
266 	if (!fbdev)
267 		return -ENOMEM;
268 
269 	private->fb_helper = helper = &fbdev->drm_fb_helper;
270 
271 	drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs);
272 
273 	num_crtc = dev->mode_config.num_crtc;
274 
275 	ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
276 	if (ret < 0) {
277 		DRM_ERROR("failed to initialize drm fb helper.\n");
278 		goto err_init;
279 	}
280 
281 	ret = drm_fb_helper_single_add_all_connectors(helper);
282 	if (ret < 0) {
283 		DRM_ERROR("failed to register drm_fb_helper_connector.\n");
284 		goto err_setup;
285 
286 	}
287 
288 	/* disable all the possible outputs/crtcs before entering KMS mode */
289 	drm_helper_disable_unused_functions(dev);
290 
291 	ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
292 	if (ret < 0) {
293 		DRM_ERROR("failed to set up hw configuration.\n");
294 		goto err_setup;
295 	}
296 
297 	return 0;
298 
299 err_setup:
300 	drm_fb_helper_fini(helper);
301 
302 err_init:
303 	private->fb_helper = NULL;
304 	kfree(fbdev);
305 
306 	return ret;
307 }
308 
exynos_drm_fbdev_destroy(struct drm_device * dev,struct drm_fb_helper * fb_helper)309 static void exynos_drm_fbdev_destroy(struct drm_device *dev,
310 				      struct drm_fb_helper *fb_helper)
311 {
312 	struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper);
313 	struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj;
314 	struct drm_framebuffer *fb;
315 
316 	if (is_drm_iommu_supported(dev) && exynos_gem_obj->buffer->kvaddr)
317 		vunmap(exynos_gem_obj->buffer->kvaddr);
318 
319 	/* release drm framebuffer and real buffer */
320 	if (fb_helper->fb && fb_helper->fb->funcs) {
321 		fb = fb_helper->fb;
322 		if (fb) {
323 			drm_framebuffer_unregister_private(fb);
324 			drm_framebuffer_remove(fb);
325 		}
326 	}
327 
328 	/* release linux framebuffer */
329 	if (fb_helper->fbdev) {
330 		struct fb_info *info;
331 		int ret;
332 
333 		info = fb_helper->fbdev;
334 		ret = unregister_framebuffer(info);
335 		if (ret < 0)
336 			DRM_DEBUG_KMS("failed unregister_framebuffer()\n");
337 
338 		if (info->cmap.len)
339 			fb_dealloc_cmap(&info->cmap);
340 
341 		framebuffer_release(info);
342 	}
343 
344 	drm_fb_helper_fini(fb_helper);
345 }
346 
exynos_drm_fbdev_fini(struct drm_device * dev)347 void exynos_drm_fbdev_fini(struct drm_device *dev)
348 {
349 	struct exynos_drm_private *private = dev->dev_private;
350 	struct exynos_drm_fbdev *fbdev;
351 
352 	if (!private || !private->fb_helper)
353 		return;
354 
355 	fbdev = to_exynos_fbdev(private->fb_helper);
356 
357 	exynos_drm_fbdev_destroy(dev, private->fb_helper);
358 	kfree(fbdev);
359 	private->fb_helper = NULL;
360 }
361 
exynos_drm_fbdev_restore_mode(struct drm_device * dev)362 void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
363 {
364 	struct exynos_drm_private *private = dev->dev_private;
365 
366 	if (!private || !private->fb_helper)
367 		return;
368 
369 	drm_fb_helper_restore_fbdev_mode_unlocked(private->fb_helper);
370 }
371