1/*
2 * Copyright (C) 2013 Red Hat
3 * Author: Rob Clark <robdclark@gmail.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 as published by
7 * the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program.  If not, see <http://www.gnu.org/licenses/>.
16 */
17
18#include "msm_drv.h"
19
20#include "drm_crtc.h"
21#include "drm_fb_helper.h"
22#include "msm_gem.h"
23
24extern int msm_gem_mmap_obj(struct drm_gem_object *obj,
25					struct vm_area_struct *vma);
26static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma);
27
28/*
29 * fbdev funcs, to implement legacy fbdev interface on top of drm driver
30 */
31
32#define to_msm_fbdev(x) container_of(x, struct msm_fbdev, base)
33
34struct msm_fbdev {
35	struct drm_fb_helper base;
36	struct drm_framebuffer *fb;
37	struct drm_gem_object *bo;
38};
39
40static struct fb_ops msm_fb_ops = {
41	.owner = THIS_MODULE,
42
43	/* Note: to properly handle manual update displays, we wrap the
44	 * basic fbdev ops which write to the framebuffer
45	 */
46	.fb_read = fb_sys_read,
47	.fb_write = fb_sys_write,
48	.fb_fillrect = sys_fillrect,
49	.fb_copyarea = sys_copyarea,
50	.fb_imageblit = sys_imageblit,
51	.fb_mmap = msm_fbdev_mmap,
52
53	.fb_check_var = drm_fb_helper_check_var,
54	.fb_set_par = drm_fb_helper_set_par,
55	.fb_pan_display = drm_fb_helper_pan_display,
56	.fb_blank = drm_fb_helper_blank,
57	.fb_setcmap = drm_fb_helper_setcmap,
58};
59
60static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
61{
62	struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par;
63	struct msm_fbdev *fbdev = to_msm_fbdev(helper);
64	struct drm_gem_object *drm_obj = fbdev->bo;
65	struct drm_device *dev = helper->dev;
66	int ret = 0;
67
68	if (drm_device_is_unplugged(dev))
69		return -ENODEV;
70
71	mutex_lock(&dev->struct_mutex);
72
73	ret = drm_gem_mmap_obj(drm_obj, drm_obj->size, vma);
74
75	mutex_unlock(&dev->struct_mutex);
76
77	if (ret) {
78		pr_err("%s:drm_gem_mmap_obj fail\n", __func__);
79		return ret;
80	}
81
82	return msm_gem_mmap_obj(drm_obj, vma);
83}
84
85static int msm_fbdev_create(struct drm_fb_helper *helper,
86		struct drm_fb_helper_surface_size *sizes)
87{
88	struct msm_fbdev *fbdev = to_msm_fbdev(helper);
89	struct drm_device *dev = helper->dev;
90	struct drm_framebuffer *fb = NULL;
91	struct fb_info *fbi = NULL;
92	struct drm_mode_fb_cmd2 mode_cmd = {0};
93	uint32_t paddr;
94	int ret, size;
95
96	DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
97			sizes->surface_height, sizes->surface_bpp,
98			sizes->fb_width, sizes->fb_height);
99
100	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
101			sizes->surface_depth);
102
103	mode_cmd.width = sizes->surface_width;
104	mode_cmd.height = sizes->surface_height;
105
106	mode_cmd.pitches[0] = align_pitch(
107			mode_cmd.width, sizes->surface_bpp);
108
109	/* allocate backing bo */
110	size = mode_cmd.pitches[0] * mode_cmd.height;
111	DBG("allocating %d bytes for fb %d", size, dev->primary->index);
112	mutex_lock(&dev->struct_mutex);
113	fbdev->bo = msm_gem_new(dev, size, MSM_BO_SCANOUT |
114			MSM_BO_WC | MSM_BO_STOLEN);
115	mutex_unlock(&dev->struct_mutex);
116	if (IS_ERR(fbdev->bo)) {
117		ret = PTR_ERR(fbdev->bo);
118		fbdev->bo = NULL;
119		dev_err(dev->dev, "failed to allocate buffer object: %d\n", ret);
120		goto fail;
121	}
122
123	fb = msm_framebuffer_init(dev, &mode_cmd, &fbdev->bo);
124	if (IS_ERR(fb)) {
125		dev_err(dev->dev, "failed to allocate fb\n");
126		/* note: if fb creation failed, we can't rely on fb destroy
127		 * to unref the bo:
128		 */
129		drm_gem_object_unreference(fbdev->bo);
130		ret = PTR_ERR(fb);
131		goto fail;
132	}
133
134	mutex_lock(&dev->struct_mutex);
135
136	/*
137	 * NOTE: if we can be guaranteed to be able to map buffer
138	 * in panic (ie. lock-safe, etc) we could avoid pinning the
139	 * buffer now:
140	 */
141	ret = msm_gem_get_iova_locked(fbdev->bo, 0, &paddr);
142	if (ret) {
143		dev_err(dev->dev, "failed to get buffer obj iova: %d\n", ret);
144		goto fail_unlock;
145	}
146
147	fbi = framebuffer_alloc(0, dev->dev);
148	if (!fbi) {
149		dev_err(dev->dev, "failed to allocate fb info\n");
150		ret = -ENOMEM;
151		goto fail_unlock;
152	}
153
154	DBG("fbi=%p, dev=%p", fbi, dev);
155
156	fbdev->fb = fb;
157	helper->fb = fb;
158	helper->fbdev = fbi;
159
160	fbi->par = helper;
161	fbi->flags = FBINFO_DEFAULT;
162	fbi->fbops = &msm_fb_ops;
163
164	strcpy(fbi->fix.id, "msm");
165
166	ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
167	if (ret) {
168		ret = -ENOMEM;
169		goto fail_unlock;
170	}
171
172	drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
173	drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
174
175	dev->mode_config.fb_base = paddr;
176
177	fbi->screen_base = msm_gem_vaddr_locked(fbdev->bo);
178	fbi->screen_size = fbdev->bo->size;
179	fbi->fix.smem_start = paddr;
180	fbi->fix.smem_len = fbdev->bo->size;
181
182	DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
183	DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);
184
185	mutex_unlock(&dev->struct_mutex);
186
187	return 0;
188
189fail_unlock:
190	mutex_unlock(&dev->struct_mutex);
191fail:
192
193	if (ret) {
194		framebuffer_release(fbi);
195		if (fb) {
196			drm_framebuffer_unregister_private(fb);
197			drm_framebuffer_remove(fb);
198		}
199	}
200
201	return ret;
202}
203
204static void msm_crtc_fb_gamma_set(struct drm_crtc *crtc,
205		u16 red, u16 green, u16 blue, int regno)
206{
207	DBG("fbdev: set gamma");
208}
209
210static void msm_crtc_fb_gamma_get(struct drm_crtc *crtc,
211		u16 *red, u16 *green, u16 *blue, int regno)
212{
213	DBG("fbdev: get gamma");
214}
215
216static const struct drm_fb_helper_funcs msm_fb_helper_funcs = {
217	.gamma_set = msm_crtc_fb_gamma_set,
218	.gamma_get = msm_crtc_fb_gamma_get,
219	.fb_probe = msm_fbdev_create,
220};
221
222/* initialize fbdev helper */
223struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev)
224{
225	struct msm_drm_private *priv = dev->dev_private;
226	struct msm_fbdev *fbdev = NULL;
227	struct drm_fb_helper *helper;
228	int ret;
229
230	fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
231	if (!fbdev)
232		goto fail;
233
234	helper = &fbdev->base;
235
236	drm_fb_helper_prepare(dev, helper, &msm_fb_helper_funcs);
237
238	ret = drm_fb_helper_init(dev, helper,
239			priv->num_crtcs, priv->num_connectors);
240	if (ret) {
241		dev_err(dev->dev, "could not init fbdev: ret=%d\n", ret);
242		goto fail;
243	}
244
245	ret = drm_fb_helper_single_add_all_connectors(helper);
246	if (ret)
247		goto fini;
248
249	ret = drm_fb_helper_initial_config(helper, 32);
250	if (ret)
251		goto fini;
252
253	priv->fbdev = helper;
254
255	return helper;
256
257fini:
258	drm_fb_helper_fini(helper);
259fail:
260	kfree(fbdev);
261	return NULL;
262}
263
264void msm_fbdev_free(struct drm_device *dev)
265{
266	struct msm_drm_private *priv = dev->dev_private;
267	struct drm_fb_helper *helper = priv->fbdev;
268	struct msm_fbdev *fbdev;
269	struct fb_info *fbi;
270
271	DBG();
272
273	fbi = helper->fbdev;
274
275	/* only cleanup framebuffer if it is present */
276	if (fbi) {
277		unregister_framebuffer(fbi);
278		framebuffer_release(fbi);
279	}
280
281	drm_fb_helper_fini(helper);
282
283	fbdev = to_msm_fbdev(priv->fbdev);
284
285	/* this will free the backing object */
286	if (fbdev->fb) {
287		drm_framebuffer_unregister_private(fbdev->fb);
288		drm_framebuffer_remove(fbdev->fb);
289	}
290
291	kfree(fbdev);
292
293	priv->fbdev = NULL;
294}
295