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 = drm_fb_helper_sys_read,
47	.fb_write = drm_fb_helper_sys_write,
48	.fb_fillrect = drm_fb_helper_sys_fillrect,
49	.fb_copyarea = drm_fb_helper_sys_copyarea,
50	.fb_imageblit = drm_fb_helper_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	ret = drm_gem_mmap_obj(drm_obj, drm_obj->size, vma);
72	if (ret) {
73		pr_err("%s:drm_gem_mmap_obj fail\n", __func__);
74		return ret;
75	}
76
77	return msm_gem_mmap_obj(drm_obj, vma);
78}
79
80static int msm_fbdev_create(struct drm_fb_helper *helper,
81		struct drm_fb_helper_surface_size *sizes)
82{
83	struct msm_fbdev *fbdev = to_msm_fbdev(helper);
84	struct drm_device *dev = helper->dev;
85	struct drm_framebuffer *fb = NULL;
86	struct fb_info *fbi = NULL;
87	struct drm_mode_fb_cmd2 mode_cmd = {0};
88	uint32_t paddr;
89	int ret, size;
90
91	DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
92			sizes->surface_height, sizes->surface_bpp,
93			sizes->fb_width, sizes->fb_height);
94
95	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
96			sizes->surface_depth);
97
98	mode_cmd.width = sizes->surface_width;
99	mode_cmd.height = sizes->surface_height;
100
101	mode_cmd.pitches[0] = align_pitch(
102			mode_cmd.width, sizes->surface_bpp);
103
104	/* allocate backing bo */
105	size = mode_cmd.pitches[0] * mode_cmd.height;
106	DBG("allocating %d bytes for fb %d", size, dev->primary->index);
107	mutex_lock(&dev->struct_mutex);
108	fbdev->bo = msm_gem_new(dev, size, MSM_BO_SCANOUT |
109			MSM_BO_WC | MSM_BO_STOLEN);
110	mutex_unlock(&dev->struct_mutex);
111	if (IS_ERR(fbdev->bo)) {
112		ret = PTR_ERR(fbdev->bo);
113		fbdev->bo = NULL;
114		dev_err(dev->dev, "failed to allocate buffer object: %d\n", ret);
115		goto fail;
116	}
117
118	fb = msm_framebuffer_init(dev, &mode_cmd, &fbdev->bo);
119	if (IS_ERR(fb)) {
120		dev_err(dev->dev, "failed to allocate fb\n");
121		/* note: if fb creation failed, we can't rely on fb destroy
122		 * to unref the bo:
123		 */
124		drm_gem_object_unreference(fbdev->bo);
125		ret = PTR_ERR(fb);
126		goto fail;
127	}
128
129	mutex_lock(&dev->struct_mutex);
130
131	/*
132	 * NOTE: if we can be guaranteed to be able to map buffer
133	 * in panic (ie. lock-safe, etc) we could avoid pinning the
134	 * buffer now:
135	 */
136	ret = msm_gem_get_iova_locked(fbdev->bo, 0, &paddr);
137	if (ret) {
138		dev_err(dev->dev, "failed to get buffer obj iova: %d\n", ret);
139		goto fail_unlock;
140	}
141
142	fbi = drm_fb_helper_alloc_fbi(helper);
143	if (IS_ERR(fbi)) {
144		dev_err(dev->dev, "failed to allocate fb info\n");
145		ret = PTR_ERR(fbi);
146		goto fail_unlock;
147	}
148
149	DBG("fbi=%p, dev=%p", fbi, dev);
150
151	fbdev->fb = fb;
152	helper->fb = fb;
153
154	fbi->par = helper;
155	fbi->flags = FBINFO_DEFAULT;
156	fbi->fbops = &msm_fb_ops;
157
158	strcpy(fbi->fix.id, "msm");
159
160	drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
161	drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
162
163	dev->mode_config.fb_base = paddr;
164
165	fbi->screen_base = msm_gem_vaddr_locked(fbdev->bo);
166	fbi->screen_size = fbdev->bo->size;
167	fbi->fix.smem_start = paddr;
168	fbi->fix.smem_len = fbdev->bo->size;
169
170	DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
171	DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);
172
173	mutex_unlock(&dev->struct_mutex);
174
175	return 0;
176
177fail_unlock:
178	mutex_unlock(&dev->struct_mutex);
179fail:
180
181	if (ret) {
182		if (fb) {
183			drm_framebuffer_unregister_private(fb);
184			drm_framebuffer_remove(fb);
185		}
186	}
187
188	return ret;
189}
190
191static void msm_crtc_fb_gamma_set(struct drm_crtc *crtc,
192		u16 red, u16 green, u16 blue, int regno)
193{
194	DBG("fbdev: set gamma");
195}
196
197static void msm_crtc_fb_gamma_get(struct drm_crtc *crtc,
198		u16 *red, u16 *green, u16 *blue, int regno)
199{
200	DBG("fbdev: get gamma");
201}
202
203static const struct drm_fb_helper_funcs msm_fb_helper_funcs = {
204	.gamma_set = msm_crtc_fb_gamma_set,
205	.gamma_get = msm_crtc_fb_gamma_get,
206	.fb_probe = msm_fbdev_create,
207};
208
209/* initialize fbdev helper */
210struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev)
211{
212	struct msm_drm_private *priv = dev->dev_private;
213	struct msm_fbdev *fbdev = NULL;
214	struct drm_fb_helper *helper;
215	int ret;
216
217	fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
218	if (!fbdev)
219		goto fail;
220
221	helper = &fbdev->base;
222
223	drm_fb_helper_prepare(dev, helper, &msm_fb_helper_funcs);
224
225	ret = drm_fb_helper_init(dev, helper,
226			priv->num_crtcs, priv->num_connectors);
227	if (ret) {
228		dev_err(dev->dev, "could not init fbdev: ret=%d\n", ret);
229		goto fail;
230	}
231
232	ret = drm_fb_helper_single_add_all_connectors(helper);
233	if (ret)
234		goto fini;
235
236	ret = drm_fb_helper_initial_config(helper, 32);
237	if (ret)
238		goto fini;
239
240	priv->fbdev = helper;
241
242	return helper;
243
244fini:
245	drm_fb_helper_fini(helper);
246fail:
247	kfree(fbdev);
248	return NULL;
249}
250
251void msm_fbdev_free(struct drm_device *dev)
252{
253	struct msm_drm_private *priv = dev->dev_private;
254	struct drm_fb_helper *helper = priv->fbdev;
255	struct msm_fbdev *fbdev;
256
257	DBG();
258
259	drm_fb_helper_unregister_fbi(helper);
260	drm_fb_helper_release_fbi(helper);
261
262	drm_fb_helper_fini(helper);
263
264	fbdev = to_msm_fbdev(priv->fbdev);
265
266	/* this will free the backing object */
267	if (fbdev->fb) {
268		drm_framebuffer_unregister_private(fbdev->fb);
269		drm_framebuffer_remove(fbdev->fb);
270	}
271
272	kfree(fbdev);
273
274	priv->fbdev = NULL;
275}
276