cirrus_fbdev.c revision f3b2bbdc8a87a080ccd23d27fca4b87d61340dd4 
1/*
2 * Copyright 2012 Red Hat
3 *
4 * This file is subject to the terms and conditions of the GNU General
5 * Public License version 2. See the file COPYING in the main
6 * directory of this archive for more details.
7 *
8 * Authors: Matthew Garrett
9 *          Dave Airlie
10 */
11#include <linux/module.h>
12#include <drm/drmP.h>
13#include <drm/drm_fb_helper.h>
14#include <drm/drm_crtc_helper.h>
15
16#include <linux/fb.h>
17
18#include "cirrus_drv.h"
19
20static void cirrus_dirty_update(struct cirrus_fbdev *afbdev,
21			     int x, int y, int width, int height)
22{
23	int i;
24	struct drm_gem_object *obj;
25	struct cirrus_bo *bo;
26	int src_offset, dst_offset;
27	int bpp = (afbdev->gfb.base.bits_per_pixel + 7)/8;
28	int ret;
29	bool unmap = false;
30	bool store_for_later = false;
31	int x2, y2;
32	unsigned long flags;
33
34	obj = afbdev->gfb.obj;
35	bo = gem_to_cirrus_bo(obj);
36
37	/*
38	 * try and reserve the BO, if we fail with busy
39	 * then the BO is being moved and we should
40	 * store up the damage until later.
41	 */
42	ret = cirrus_bo_reserve(bo, true);
43	if (ret) {
44		if (ret != -EBUSY)
45			return;
46		store_for_later = true;
47	}
48
49	x2 = x + width - 1;
50	y2 = y + height - 1;
51	spin_lock_irqsave(&afbdev->dirty_lock, flags);
52
53	if (afbdev->y1 < y)
54		y = afbdev->y1;
55	if (afbdev->y2 > y2)
56		y2 = afbdev->y2;
57	if (afbdev->x1 < x)
58		x = afbdev->x1;
59	if (afbdev->x2 > x2)
60		x2 = afbdev->x2;
61
62	if (store_for_later) {
63		afbdev->x1 = x;
64		afbdev->x2 = x2;
65		afbdev->y1 = y;
66		afbdev->y2 = y2;
67		spin_unlock_irqrestore(&afbdev->dirty_lock, flags);
68		return;
69	}
70
71	afbdev->x1 = afbdev->y1 = INT_MAX;
72	afbdev->x2 = afbdev->y2 = 0;
73	spin_unlock_irqrestore(&afbdev->dirty_lock, flags);
74
75	if (!bo->kmap.virtual) {
76		ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages, &bo->kmap);
77		if (ret) {
78			DRM_ERROR("failed to kmap fb updates\n");
79			cirrus_bo_unreserve(bo);
80			return;
81		}
82		unmap = true;
83	}
84	for (i = y; i < y + height; i++) {
85		/* assume equal stride for now */
86		src_offset = dst_offset = i * afbdev->gfb.base.pitches[0] + (x * bpp);
87		memcpy_toio(bo->kmap.virtual + src_offset, afbdev->sysram + src_offset, width * bpp);
88
89	}
90	if (unmap)
91		ttm_bo_kunmap(&bo->kmap);
92
93	cirrus_bo_unreserve(bo);
94}
95
96static void cirrus_fillrect(struct fb_info *info,
97			 const struct fb_fillrect *rect)
98{
99	struct cirrus_fbdev *afbdev = info->par;
100	sys_fillrect(info, rect);
101	cirrus_dirty_update(afbdev, rect->dx, rect->dy, rect->width,
102			 rect->height);
103}
104
105static void cirrus_copyarea(struct fb_info *info,
106			 const struct fb_copyarea *area)
107{
108	struct cirrus_fbdev *afbdev = info->par;
109	sys_copyarea(info, area);
110	cirrus_dirty_update(afbdev, area->dx, area->dy, area->width,
111			 area->height);
112}
113
114static void cirrus_imageblit(struct fb_info *info,
115			  const struct fb_image *image)
116{
117	struct cirrus_fbdev *afbdev = info->par;
118	sys_imageblit(info, image);
119	cirrus_dirty_update(afbdev, image->dx, image->dy, image->width,
120			 image->height);
121}
122
123
124static struct fb_ops cirrusfb_ops = {
125	.owner = THIS_MODULE,
126	.fb_check_var = drm_fb_helper_check_var,
127	.fb_set_par = drm_fb_helper_set_par,
128	.fb_fillrect = cirrus_fillrect,
129	.fb_copyarea = cirrus_copyarea,
130	.fb_imageblit = cirrus_imageblit,
131	.fb_pan_display = drm_fb_helper_pan_display,
132	.fb_blank = drm_fb_helper_blank,
133	.fb_setcmap = drm_fb_helper_setcmap,
134};
135
136static int cirrusfb_create_object(struct cirrus_fbdev *afbdev,
137			       struct drm_mode_fb_cmd2 *mode_cmd,
138			       struct drm_gem_object **gobj_p)
139{
140	struct drm_device *dev = afbdev->helper.dev;
141	u32 bpp, depth;
142	u32 size;
143	struct drm_gem_object *gobj;
144
145	int ret = 0;
146	drm_fb_get_bpp_depth(mode_cmd->pixel_format, &depth, &bpp);
147
148	if (bpp > 24)
149		return -EINVAL;
150	size = mode_cmd->pitches[0] * mode_cmd->height;
151	ret = cirrus_gem_create(dev, size, true, &gobj);
152	if (ret)
153		return ret;
154
155	*gobj_p = gobj;
156	return ret;
157}
158
159static int cirrusfb_create(struct drm_fb_helper *helper,
160			   struct drm_fb_helper_surface_size *sizes)
161{
162	struct cirrus_fbdev *gfbdev = (struct cirrus_fbdev *)helper;
163	struct drm_device *dev = gfbdev->helper.dev;
164	struct cirrus_device *cdev = gfbdev->helper.dev->dev_private;
165	struct fb_info *info;
166	struct drm_framebuffer *fb;
167	struct drm_mode_fb_cmd2 mode_cmd;
168	struct device *device = &dev->pdev->dev;
169	void *sysram;
170	struct drm_gem_object *gobj = NULL;
171	struct cirrus_bo *bo = NULL;
172	int size, ret;
173
174	mode_cmd.width = sizes->surface_width;
175	mode_cmd.height = sizes->surface_height;
176	mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8);
177	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
178							  sizes->surface_depth);
179	size = mode_cmd.pitches[0] * mode_cmd.height;
180
181	ret = cirrusfb_create_object(gfbdev, &mode_cmd, &gobj);
182	if (ret) {
183		DRM_ERROR("failed to create fbcon backing object %d\n", ret);
184		return ret;
185	}
186
187	bo = gem_to_cirrus_bo(gobj);
188
189	sysram = vmalloc(size);
190	if (!sysram)
191		return -ENOMEM;
192
193	info = framebuffer_alloc(0, device);
194	if (info == NULL)
195		return -ENOMEM;
196
197	info->par = gfbdev;
198
199	ret = cirrus_framebuffer_init(cdev->dev, &gfbdev->gfb, &mode_cmd, gobj);
200	if (ret)
201		return ret;
202
203	gfbdev->sysram = sysram;
204	gfbdev->size = size;
205
206	fb = &gfbdev->gfb.base;
207	if (!fb) {
208		DRM_INFO("fb is NULL\n");
209		return -EINVAL;
210	}
211
212	/* setup helper */
213	gfbdev->helper.fb = fb;
214	gfbdev->helper.fbdev = info;
215
216	strcpy(info->fix.id, "cirrusdrmfb");
217
218
219	info->flags = FBINFO_DEFAULT;
220	info->fbops = &cirrusfb_ops;
221
222	drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
223	drm_fb_helper_fill_var(info, &gfbdev->helper, sizes->fb_width,
224			       sizes->fb_height);
225
226	/* setup aperture base/size for vesafb takeover */
227	info->apertures = alloc_apertures(1);
228	if (!info->apertures) {
229		ret = -ENOMEM;
230		goto out_iounmap;
231	}
232	info->apertures->ranges[0].base = cdev->dev->mode_config.fb_base;
233	info->apertures->ranges[0].size = cdev->mc.vram_size;
234
235	info->screen_base = sysram;
236	info->screen_size = size;
237
238	info->fix.mmio_start = 0;
239	info->fix.mmio_len = 0;
240
241	ret = fb_alloc_cmap(&info->cmap, 256, 0);
242	if (ret) {
243		DRM_ERROR("%s: can't allocate color map\n", info->fix.id);
244		ret = -ENOMEM;
245		goto out_iounmap;
246	}
247
248	DRM_INFO("fb mappable at 0x%lX\n", info->fix.smem_start);
249	DRM_INFO("vram aper at 0x%lX\n", (unsigned long)info->fix.smem_start);
250	DRM_INFO("size %lu\n", (unsigned long)info->fix.smem_len);
251	DRM_INFO("fb depth is %d\n", fb->depth);
252	DRM_INFO("   pitch is %d\n", fb->pitches[0]);
253
254	return 0;
255out_iounmap:
256	return ret;
257}
258
259static int cirrus_fbdev_destroy(struct drm_device *dev,
260				struct cirrus_fbdev *gfbdev)
261{
262	struct fb_info *info;
263	struct cirrus_framebuffer *gfb = &gfbdev->gfb;
264
265	if (gfbdev->helper.fbdev) {
266		info = gfbdev->helper.fbdev;
267
268		unregister_framebuffer(info);
269		if (info->cmap.len)
270			fb_dealloc_cmap(&info->cmap);
271		framebuffer_release(info);
272	}
273
274	if (gfb->obj) {
275		drm_gem_object_unreference_unlocked(gfb->obj);
276		gfb->obj = NULL;
277	}
278
279	vfree(gfbdev->sysram);
280	drm_fb_helper_fini(&gfbdev->helper);
281	drm_framebuffer_unregister_private(&gfb->base);
282	drm_framebuffer_cleanup(&gfb->base);
283
284	return 0;
285}
286
287static struct drm_fb_helper_funcs cirrus_fb_helper_funcs = {
288	.gamma_set = cirrus_crtc_fb_gamma_set,
289	.gamma_get = cirrus_crtc_fb_gamma_get,
290	.fb_probe = cirrusfb_create,
291};
292
293int cirrus_fbdev_init(struct cirrus_device *cdev)
294{
295	struct cirrus_fbdev *gfbdev;
296	int ret;
297	int bpp_sel = 24;
298
299	/*bpp_sel = 8;*/
300	gfbdev = kzalloc(sizeof(struct cirrus_fbdev), GFP_KERNEL);
301	if (!gfbdev)
302		return -ENOMEM;
303
304	cdev->mode_info.gfbdev = gfbdev;
305	gfbdev->helper.funcs = &cirrus_fb_helper_funcs;
306	spin_lock_init(&gfbdev->dirty_lock);
307
308	ret = drm_fb_helper_init(cdev->dev, &gfbdev->helper,
309				 cdev->num_crtc, CIRRUSFB_CONN_LIMIT);
310	if (ret) {
311		kfree(gfbdev);
312		return ret;
313	}
314	drm_fb_helper_single_add_all_connectors(&gfbdev->helper);
315
316	/* disable all the possible outputs/crtcs before entering KMS mode */
317	drm_helper_disable_unused_functions(cdev->dev);
318	drm_fb_helper_initial_config(&gfbdev->helper, bpp_sel);
319
320	return 0;
321}
322
323void cirrus_fbdev_fini(struct cirrus_device *cdev)
324{
325	if (!cdev->mode_info.gfbdev)
326		return;
327
328	cirrus_fbdev_destroy(cdev->dev, cdev->mode_info.gfbdev);
329	kfree(cdev->mode_info.gfbdev);
330	cdev->mode_info.gfbdev = NULL;
331}
332