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	DRM_FB_HELPER_DEFAULT_OPS,
 43
 44	/* Note: to properly handle manual update displays, we wrap the
 45	 * basic fbdev ops which write to the framebuffer
 46	 */
 47	.fb_read = drm_fb_helper_sys_read,
 48	.fb_write = drm_fb_helper_sys_write,
 49	.fb_fillrect = drm_fb_helper_sys_fillrect,
 50	.fb_copyarea = drm_fb_helper_sys_copyarea,
 51	.fb_imageblit = drm_fb_helper_sys_imageblit,
 52	.fb_mmap = msm_fbdev_mmap,
 53};
 54
 55static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
 56{
 57	struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par;
 58	struct msm_fbdev *fbdev = to_msm_fbdev(helper);
 59	struct drm_gem_object *drm_obj = fbdev->bo;
 60	int ret = 0;
 61
 62	ret = drm_gem_mmap_obj(drm_obj, drm_obj->size, vma);
 63	if (ret) {
 64		pr_err("%s:drm_gem_mmap_obj fail\n", __func__);
 65		return ret;
 66	}
 67
 68	return msm_gem_mmap_obj(drm_obj, vma);
 69}
 70
 71static int msm_fbdev_create(struct drm_fb_helper *helper,
 72		struct drm_fb_helper_surface_size *sizes)
 73{
 74	struct msm_fbdev *fbdev = to_msm_fbdev(helper);
 75	struct drm_device *dev = helper->dev;
 76	struct drm_framebuffer *fb = NULL;
 77	struct fb_info *fbi = NULL;
 78	struct drm_mode_fb_cmd2 mode_cmd = {0};
 79	uint64_t paddr;
 80	int ret, size;
 81
 82	DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
 83			sizes->surface_height, sizes->surface_bpp,
 84			sizes->fb_width, sizes->fb_height);
 85
 86	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 87			sizes->surface_depth);
 88
 89	mode_cmd.width = sizes->surface_width;
 90	mode_cmd.height = sizes->surface_height;
 91
 92	mode_cmd.pitches[0] = align_pitch(
 93			mode_cmd.width, sizes->surface_bpp);
 94
 95	/* allocate backing bo */
 96	size = mode_cmd.pitches[0] * mode_cmd.height;
 97	DBG("allocating %d bytes for fb %d", size, dev->primary->index);
 98	mutex_lock(&dev->struct_mutex);
 99	fbdev->bo = msm_gem_new(dev, size, MSM_BO_SCANOUT |
100			MSM_BO_WC | MSM_BO_STOLEN);
101	mutex_unlock(&dev->struct_mutex);
102	if (IS_ERR(fbdev->bo)) {
103		ret = PTR_ERR(fbdev->bo);
104		fbdev->bo = NULL;
105		dev_err(dev->dev, "failed to allocate buffer object: %d\n", ret);
106		goto fail;
107	}
108
109	fb = msm_framebuffer_init(dev, &mode_cmd, &fbdev->bo);
110	if (IS_ERR(fb)) {
111		dev_err(dev->dev, "failed to allocate fb\n");
112		/* note: if fb creation failed, we can't rely on fb destroy
113		 * to unref the bo:
114		 */
115		drm_gem_object_unreference_unlocked(fbdev->bo);
116		ret = PTR_ERR(fb);
117		goto fail;
118	}
119
120	mutex_lock(&dev->struct_mutex);
121
122	/*
123	 * NOTE: if we can be guaranteed to be able to map buffer
124	 * in panic (ie. lock-safe, etc) we could avoid pinning the
125	 * buffer now:
126	 */
127	ret = msm_gem_get_iova_locked(fbdev->bo, 0, &paddr);
128	if (ret) {
129		dev_err(dev->dev, "failed to get buffer obj iova: %d\n", ret);
130		goto fail_unlock;
131	}
132
133	fbi = drm_fb_helper_alloc_fbi(helper);
134	if (IS_ERR(fbi)) {
135		dev_err(dev->dev, "failed to allocate fb info\n");
136		ret = PTR_ERR(fbi);
137		goto fail_unlock;
138	}
139
140	DBG("fbi=%p, dev=%p", fbi, dev);
141
142	fbdev->fb = fb;
143	helper->fb = fb;
144
145	fbi->par = helper;
146	fbi->flags = FBINFO_DEFAULT;
147	fbi->fbops = &msm_fb_ops;
148
149	strcpy(fbi->fix.id, "msm");
150
151	drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
152	drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
153
154	dev->mode_config.fb_base = paddr;
155
156	fbi->screen_base = msm_gem_get_vaddr_locked(fbdev->bo);
157	if (IS_ERR(fbi->screen_base)) {
158		ret = PTR_ERR(fbi->screen_base);
159		goto fail_unlock;
160	}
161	fbi->screen_size = fbdev->bo->size;
162	fbi->fix.smem_start = paddr;
163	fbi->fix.smem_len = fbdev->bo->size;
164
165	DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
166	DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);
167
168	mutex_unlock(&dev->struct_mutex);
169
170	return 0;
171
172fail_unlock:
173	mutex_unlock(&dev->struct_mutex);
174fail:
175
176	if (ret) {
177		if (fb) {
178			drm_framebuffer_unregister_private(fb);
179			drm_framebuffer_remove(fb);
180		}
181	}
182
183	return ret;
184}
185
186static const struct drm_fb_helper_funcs msm_fb_helper_funcs = {
187	.fb_probe = msm_fbdev_create,
188};
189
190/* initialize fbdev helper */
191struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev)
192{
193	struct msm_drm_private *priv = dev->dev_private;
194	struct msm_fbdev *fbdev = NULL;
195	struct drm_fb_helper *helper;
196	int ret;
197
198	fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
199	if (!fbdev)
200		goto fail;
201
202	helper = &fbdev->base;
203
204	drm_fb_helper_prepare(dev, helper, &msm_fb_helper_funcs);
205
206	ret = drm_fb_helper_init(dev, helper,
207			priv->num_crtcs, priv->num_connectors);
208	if (ret) {
209		dev_err(dev->dev, "could not init fbdev: ret=%d\n", ret);
210		goto fail;
211	}
212
213	ret = drm_fb_helper_single_add_all_connectors(helper);
214	if (ret)
215		goto fini;
216
217	ret = drm_fb_helper_initial_config(helper, 32);
218	if (ret)
219		goto fini;
220
221	priv->fbdev = helper;
222
223	return helper;
224
225fini:
226	drm_fb_helper_fini(helper);
227fail:
228	kfree(fbdev);
229	return NULL;
230}
231
232void msm_fbdev_free(struct drm_device *dev)
233{
234	struct msm_drm_private *priv = dev->dev_private;
235	struct drm_fb_helper *helper = priv->fbdev;
236	struct msm_fbdev *fbdev;
237
238	DBG();
239
240	drm_fb_helper_unregister_fbi(helper);
241	drm_fb_helper_release_fbi(helper);
242
243	drm_fb_helper_fini(helper);
244
245	fbdev = to_msm_fbdev(priv->fbdev);
246
247	/* this will free the backing object */
248	if (fbdev->fb) {
249		msm_gem_put_vaddr(fbdev->bo);
250		drm_framebuffer_unregister_private(fbdev->fb);
251		drm_framebuffer_remove(fbdev->fb);
252	}
253
254	kfree(fbdev);
255
256	priv->fbdev = NULL;
257}