1/*
  2 * Copyright 2010 Matt Turner.
  3 * Copyright 2012 Red Hat
  4 *
  5 * This file is subject to the terms and conditions of the GNU General
  6 * Public License version 2. See the file COPYING in the main
  7 * directory of this archive for more details.
  8 *
  9 * Authors: Matthew Garrett
 10 *          Matt Turner
 11 *          Dave Airlie
 12 */
 13#include <linux/module.h>
 14#include "drmP.h"
 15#include "drm.h"
 16#include "drm_fb_helper.h"
 17
 18#include <linux/fb.h>
 19
 20#include "mgag200_drv.h"
 21
 22static void mga_dirty_update(struct mga_fbdev *mfbdev,
 23			     int x, int y, int width, int height)
 24{
 25	int i;
 26	struct drm_gem_object *obj;
 27	struct mgag200_bo *bo;
 28	int src_offset, dst_offset;
 29	int bpp = (mfbdev->mfb.base.bits_per_pixel + 7)/8;
 30	int ret;
 31	bool unmap = false;
 32
 33	obj = mfbdev->mfb.obj;
 34	bo = gem_to_mga_bo(obj);
 35
 36	ret = mgag200_bo_reserve(bo, true);
 37	if (ret) {
 38		DRM_ERROR("failed to reserve fb bo\n");
 39		return;
 40	}
 41
 42	if (!bo->kmap.virtual) {
 43		ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages, &bo->kmap);
 44		if (ret) {
 45			DRM_ERROR("failed to kmap fb updates\n");
 46			mgag200_bo_unreserve(bo);
 47			return;
 48		}
 49		unmap = true;
 50	}
 51	for (i = y; i < y + height; i++) {
 52		/* assume equal stride for now */
 53		src_offset = dst_offset = i * mfbdev->mfb.base.pitches[0] + (x * bpp);
 54		memcpy_toio(bo->kmap.virtual + src_offset, mfbdev->sysram + src_offset, width * bpp);
 55
 56	}
 57	if (unmap)
 58		ttm_bo_kunmap(&bo->kmap);
 59
 60	mgag200_bo_unreserve(bo);
 61}
 62
 63static void mga_fillrect(struct fb_info *info,
 64			 const struct fb_fillrect *rect)
 65{
 66	struct mga_fbdev *mfbdev = info->par;
 67	sys_fillrect(info, rect);
 68	mga_dirty_update(mfbdev, rect->dx, rect->dy, rect->width,
 69			 rect->height);
 70}
 71
 72static void mga_copyarea(struct fb_info *info,
 73			 const struct fb_copyarea *area)
 74{
 75	struct mga_fbdev *mfbdev = info->par;
 76	sys_copyarea(info, area);
 77	mga_dirty_update(mfbdev, area->dx, area->dy, area->width,
 78			 area->height);
 79}
 80
 81static void mga_imageblit(struct fb_info *info,
 82			  const struct fb_image *image)
 83{
 84	struct mga_fbdev *mfbdev = info->par;
 85	sys_imageblit(info, image);
 86	mga_dirty_update(mfbdev, image->dx, image->dy, image->width,
 87			 image->height);
 88}
 89
 90
 91static struct fb_ops mgag200fb_ops = {
 92	.owner = THIS_MODULE,
 93	.fb_check_var = drm_fb_helper_check_var,
 94	.fb_set_par = drm_fb_helper_set_par,
 95	.fb_fillrect = mga_fillrect,
 96	.fb_copyarea = mga_copyarea,
 97	.fb_imageblit = mga_imageblit,
 98	.fb_pan_display = drm_fb_helper_pan_display,
 99	.fb_blank = drm_fb_helper_blank,
100	.fb_setcmap = drm_fb_helper_setcmap,
101};
102
103static int mgag200fb_create_object(struct mga_fbdev *afbdev,
104				   struct drm_mode_fb_cmd2 *mode_cmd,
105				   struct drm_gem_object **gobj_p)
106{
107	struct drm_device *dev = afbdev->helper.dev;
108	u32 bpp, depth;
109	u32 size;
110	struct drm_gem_object *gobj;
111
112	int ret = 0;
113	drm_fb_get_bpp_depth(mode_cmd->pixel_format, &depth, &bpp);
114
115	size = mode_cmd->pitches[0] * mode_cmd->height;
116	ret = mgag200_gem_create(dev, size, true, &gobj);
117	if (ret)
118		return ret;
119
120	*gobj_p = gobj;
121	return ret;
122}
123
124static int mgag200fb_create(struct mga_fbdev *mfbdev,
125			   struct drm_fb_helper_surface_size *sizes)
126{
127	struct drm_device *dev = mfbdev->helper.dev;
128	struct drm_mode_fb_cmd2 mode_cmd;
129	struct mga_device *mdev = dev->dev_private;
130	struct fb_info *info;
131	struct drm_framebuffer *fb;
132	struct drm_gem_object *gobj = NULL;
133	struct device *device = &dev->pdev->dev;
134	struct mgag200_bo *bo;
135	int ret;
136	void *sysram;
137	int size;
138
139	mode_cmd.width = sizes->surface_width;
140	mode_cmd.height = sizes->surface_height;
141	mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8);
142
143	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
144							  sizes->surface_depth);
145	size = mode_cmd.pitches[0] * mode_cmd.height;
146
147	ret = mgag200fb_create_object(mfbdev, &mode_cmd, &gobj);
148	if (ret) {
149		DRM_ERROR("failed to create fbcon backing object %d\n", ret);
150		return ret;
151	}
152	bo = gem_to_mga_bo(gobj);
153
154	sysram = vmalloc(size);
155	if (!sysram)
156		return -ENOMEM;
157
158	info = framebuffer_alloc(0, device);
159	if (info == NULL)
160		return -ENOMEM;
161
162	info->par = mfbdev;
163
164	ret = mgag200_framebuffer_init(dev, &mfbdev->mfb, &mode_cmd, gobj);
165	if (ret)
166		return ret;
167
168	mfbdev->sysram = sysram;
169	mfbdev->size = size;
170
171	fb = &mfbdev->mfb.base;
172
173	/* setup helper */
174	mfbdev->helper.fb = fb;
175	mfbdev->helper.fbdev = info;
176
177	ret = fb_alloc_cmap(&info->cmap, 256, 0);
178	if (ret) {
179		DRM_ERROR("%s: can't allocate color map\n", info->fix.id);
180		ret = -ENOMEM;
181		goto out;
182	}
183
184	strcpy(info->fix.id, "mgadrmfb");
185
186	info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
187	info->fbops = &mgag200fb_ops;
188
189	/* setup aperture base/size for vesafb takeover */
190	info->apertures = alloc_apertures(1);
191	if (!info->apertures) {
192		ret = -ENOMEM;
193		goto out;
194	}
195	info->apertures->ranges[0].base = mdev->dev->mode_config.fb_base;
196	info->apertures->ranges[0].size = mdev->mc.vram_size;
197
198	drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
199	drm_fb_helper_fill_var(info, &mfbdev->helper, sizes->fb_width,
200			       sizes->fb_height);
201
202	info->screen_base = sysram;
203	info->screen_size = size;
204	info->pixmap.flags = FB_PIXMAP_SYSTEM;
205
206	DRM_DEBUG_KMS("allocated %dx%d\n",
207		      fb->width, fb->height);
208	return 0;
209out:
210	return ret;
211}
212
213static int mga_fb_find_or_create_single(struct drm_fb_helper *helper,
214					   struct drm_fb_helper_surface_size
215					   *sizes)
216{
217	struct mga_fbdev *mfbdev = (struct mga_fbdev *)helper;
218	int new_fb = 0;
219	int ret;
220
221	if (!helper->fb) {
222		ret = mgag200fb_create(mfbdev, sizes);
223		if (ret)
224			return ret;
225		new_fb = 1;
226	}
227	return new_fb;
228}
229
230static int mga_fbdev_destroy(struct drm_device *dev,
231				struct mga_fbdev *mfbdev)
232{
233	struct fb_info *info;
234	struct mga_framebuffer *mfb = &mfbdev->mfb;
235
236	if (mfbdev->helper.fbdev) {
237		info = mfbdev->helper.fbdev;
238
239		unregister_framebuffer(info);
240		if (info->cmap.len)
241			fb_dealloc_cmap(&info->cmap);
242		framebuffer_release(info);
243	}
244
245	if (mfb->obj) {
246		drm_gem_object_unreference_unlocked(mfb->obj);
247		mfb->obj = NULL;
248	}
249	drm_fb_helper_fini(&mfbdev->helper);
250	vfree(mfbdev->sysram);
251	drm_framebuffer_cleanup(&mfb->base);
252
253	return 0;
254}
255
256static struct drm_fb_helper_funcs mga_fb_helper_funcs = {
257	.gamma_set = mga_crtc_fb_gamma_set,
258	.gamma_get = mga_crtc_fb_gamma_get,
259	.fb_probe = mga_fb_find_or_create_single,
260};
261
262int mgag200_fbdev_init(struct mga_device *mdev)
263{
264	struct mga_fbdev *mfbdev;
265	int ret;
266
267	mfbdev = kzalloc(sizeof(struct mga_fbdev), GFP_KERNEL);
268	if (!mfbdev)
269		return -ENOMEM;
270
271	mdev->mfbdev = mfbdev;
272	mfbdev->helper.funcs = &mga_fb_helper_funcs;
273
274	ret = drm_fb_helper_init(mdev->dev, &mfbdev->helper,
275				 mdev->num_crtc, MGAG200FB_CONN_LIMIT);
276	if (ret) {
277		kfree(mfbdev);
278		return ret;
279	}
280	drm_fb_helper_single_add_all_connectors(&mfbdev->helper);
281	drm_fb_helper_initial_config(&mfbdev->helper, 32);
282
283	return 0;
284}
285
286void mgag200_fbdev_fini(struct mga_device *mdev)
287{
288	if (!mdev->mfbdev)
289		return;
290
291	mga_fbdev_destroy(mdev->dev, mdev->mfbdev);
292	kfree(mdev->mfbdev);
293	mdev->mfbdev = NULL;
294}