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 
20 #include "exynos_drm_drv.h"
21 #include "exynos_drm_fb.h"
22 #include "exynos_drm_gem.h"
23 #include "exynos_drm_iommu.h"
24 
25 #define MAX_CONNECTOR		4
26 #define PREFERRED_BPP		32
27 
28 #define to_exynos_fbdev(x)	container_of(x, struct exynos_drm_fbdev,\
29 				drm_fb_helper)
30 
31 struct exynos_drm_fbdev {
32 	struct drm_fb_helper		drm_fb_helper;
33 	struct exynos_drm_gem_obj	*exynos_gem_obj;
34 };
35 
36 static int exynos_drm_fb_mmap(struct fb_info *info,
37 			struct vm_area_struct *vma)
38 {
39 	struct drm_fb_helper *helper = info->par;
40 	struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper);
41 	struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj;
42 	struct exynos_drm_gem_buf *buffer = exynos_gem_obj->buffer;
43 	unsigned long vm_size;
44 	int ret;
45 
46 	DRM_DEBUG_KMS("%s\n", __func__);
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 
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_DEBUG_KMS("%s\n", __FILE__);
88 
89 	drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
90 	drm_fb_helper_fill_var(fbi, helper, fb->width, fb->height);
91 
92 	/* RGB formats use only one buffer */
93 	buffer = exynos_drm_fb_buffer(fb, 0);
94 	if (!buffer) {
95 		DRM_LOG_KMS("buffer is null.\n");
96 		return -EFAULT;
97 	}
98 
99 	/* map pages with kernel virtual space. */
100 	if (!buffer->kvaddr) {
101 		if (is_drm_iommu_supported(dev)) {
102 			unsigned int nr_pages = buffer->size >> PAGE_SHIFT;
103 
104 			buffer->kvaddr = vmap(buffer->pages, nr_pages, VM_MAP,
105 					pgprot_writecombine(PAGE_KERNEL));
106 		} else {
107 			phys_addr_t dma_addr = buffer->dma_addr;
108 			if (dma_addr)
109 				buffer->kvaddr = phys_to_virt(dma_addr);
110 			else
111 				buffer->kvaddr = (void __iomem *)NULL;
112 		}
113 		if (!buffer->kvaddr) {
114 			DRM_ERROR("failed to map pages to kernel space.\n");
115 			return -EIO;
116 		}
117 	}
118 
119 	/* buffer count to framebuffer always is 1 at booting time. */
120 	exynos_drm_fb_set_buf_cnt(fb, 1);
121 
122 	offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
123 	offset += fbi->var.yoffset * fb->pitches[0];
124 
125 	dev->mode_config.fb_base = (resource_size_t)buffer->dma_addr;
126 	fbi->screen_base = buffer->kvaddr + offset;
127 	if (is_drm_iommu_supported(dev))
128 		fbi->fix.smem_start = (unsigned long)
129 			(page_to_phys(sg_page(buffer->sgt->sgl)) + offset);
130 	else
131 		fbi->fix.smem_start = (unsigned long)buffer->dma_addr;
132 
133 	fbi->screen_size = size;
134 	fbi->fix.smem_len = size;
135 
136 	return 0;
137 }
138 
139 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
140 				    struct drm_fb_helper_surface_size *sizes)
141 {
142 	struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
143 	struct exynos_drm_gem_obj *exynos_gem_obj;
144 	struct drm_device *dev = helper->dev;
145 	struct fb_info *fbi;
146 	struct drm_mode_fb_cmd2 mode_cmd = { 0 };
147 	struct platform_device *pdev = dev->platformdev;
148 	unsigned long size;
149 	int ret;
150 
151 	DRM_DEBUG_KMS("%s\n", __FILE__);
152 
153 	DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
154 			sizes->surface_width, sizes->surface_height,
155 			sizes->surface_bpp);
156 
157 	mode_cmd.width = sizes->surface_width;
158 	mode_cmd.height = sizes->surface_height;
159 	mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
160 	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
161 							  sizes->surface_depth);
162 
163 	mutex_lock(&dev->struct_mutex);
164 
165 	fbi = framebuffer_alloc(0, &pdev->dev);
166 	if (!fbi) {
167 		DRM_ERROR("failed to allocate fb info.\n");
168 		ret = -ENOMEM;
169 		goto out;
170 	}
171 
172 	size = mode_cmd.pitches[0] * mode_cmd.height;
173 
174 	/* 0 means to allocate physically continuous memory */
175 	exynos_gem_obj = exynos_drm_gem_create(dev, 0, size);
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_OR_NULL(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 int exynos_drm_fbdev_probe(struct drm_fb_helper *helper,
230 				   struct drm_fb_helper_surface_size *sizes)
231 {
232 	int ret = 0;
233 
234 	DRM_DEBUG_KMS("%s\n", __FILE__);
235 
236 	/*
237 	 * with !helper->fb, it means that this funcion is called first time
238 	 * and after that, the helper->fb would be used as clone mode.
239 	 */
240 	if (!helper->fb) {
241 		ret = exynos_drm_fbdev_create(helper, sizes);
242 		if (ret < 0) {
243 			DRM_ERROR("failed to create fbdev.\n");
244 			return ret;
245 		}
246 
247 		/*
248 		 * fb_helper expects a value more than 1 if succeed
249 		 * because register_framebuffer() should be called.
250 		 */
251 		ret = 1;
252 	}
253 
254 	return ret;
255 }
256 
257 static struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
258 	.fb_probe =	exynos_drm_fbdev_probe,
259 };
260 
261 int exynos_drm_fbdev_init(struct drm_device *dev)
262 {
263 	struct exynos_drm_fbdev *fbdev;
264 	struct exynos_drm_private *private = dev->dev_private;
265 	struct drm_fb_helper *helper;
266 	unsigned int num_crtc;
267 	int ret;
268 
269 	DRM_DEBUG_KMS("%s\n", __FILE__);
270 
271 	if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
272 		return 0;
273 
274 	fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
275 	if (!fbdev) {
276 		DRM_ERROR("failed to allocate drm fbdev.\n");
277 		return -ENOMEM;
278 	}
279 
280 	private->fb_helper = helper = &fbdev->drm_fb_helper;
281 	helper->funcs = &exynos_drm_fb_helper_funcs;
282 
283 	num_crtc = dev->mode_config.num_crtc;
284 
285 	ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
286 	if (ret < 0) {
287 		DRM_ERROR("failed to initialize drm fb helper.\n");
288 		goto err_init;
289 	}
290 
291 	ret = drm_fb_helper_single_add_all_connectors(helper);
292 	if (ret < 0) {
293 		DRM_ERROR("failed to register drm_fb_helper_connector.\n");
294 		goto err_setup;
295 
296 	}
297 
298 	ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
299 	if (ret < 0) {
300 		DRM_ERROR("failed to set up hw configuration.\n");
301 		goto err_setup;
302 	}
303 
304 	return 0;
305 
306 err_setup:
307 	drm_fb_helper_fini(helper);
308 
309 err_init:
310 	private->fb_helper = NULL;
311 	kfree(fbdev);
312 
313 	return ret;
314 }
315 
316 static void exynos_drm_fbdev_destroy(struct drm_device *dev,
317 				      struct drm_fb_helper *fb_helper)
318 {
319 	struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper);
320 	struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj;
321 	struct drm_framebuffer *fb;
322 
323 	if (is_drm_iommu_supported(dev) && exynos_gem_obj->buffer->kvaddr)
324 		vunmap(exynos_gem_obj->buffer->kvaddr);
325 
326 	/* release drm framebuffer and real buffer */
327 	if (fb_helper->fb && fb_helper->fb->funcs) {
328 		fb = fb_helper->fb;
329 		if (fb)
330 			drm_framebuffer_remove(fb);
331 	}
332 
333 	/* release linux framebuffer */
334 	if (fb_helper->fbdev) {
335 		struct fb_info *info;
336 		int ret;
337 
338 		info = fb_helper->fbdev;
339 		ret = unregister_framebuffer(info);
340 		if (ret < 0)
341 			DRM_DEBUG_KMS("failed unregister_framebuffer()\n");
342 
343 		if (info->cmap.len)
344 			fb_dealloc_cmap(&info->cmap);
345 
346 		framebuffer_release(info);
347 	}
348 
349 	drm_fb_helper_fini(fb_helper);
350 }
351 
352 void exynos_drm_fbdev_fini(struct drm_device *dev)
353 {
354 	struct exynos_drm_private *private = dev->dev_private;
355 	struct exynos_drm_fbdev *fbdev;
356 
357 	if (!private || !private->fb_helper)
358 		return;
359 
360 	fbdev = to_exynos_fbdev(private->fb_helper);
361 
362 	if (fbdev->exynos_gem_obj)
363 		exynos_drm_gem_destroy(fbdev->exynos_gem_obj);
364 
365 	exynos_drm_fbdev_destroy(dev, private->fb_helper);
366 	kfree(fbdev);
367 	private->fb_helper = NULL;
368 }
369 
370 void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
371 {
372 	struct exynos_drm_private *private = dev->dev_private;
373 
374 	if (!private || !private->fb_helper)
375 		return;
376 
377 	drm_fb_helper_restore_fbdev_mode(private->fb_helper);
378 }
379