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 <drm/drmP.h>
 15#include <drm/drm_fb_helper.h>
 16#include <drm/drm_crtc_helper.h>
 17
 18#include "mgag200_drv.h"
 19
 20static void mga_dirty_update(struct mga_fbdev *mfbdev,
 21			     int x, int y, int width, int height)
 22{
 23	int i;
 24	struct drm_gem_object *obj;
 25	struct mgag200_bo *bo;
 26	int src_offset, dst_offset;
 27	int bpp = mfbdev->mfb.base.format->cpp[0];
 28	int ret = -EBUSY;
 29	bool unmap = false;
 30	bool store_for_later = false;
 31	int x2, y2;
 32	unsigned long flags;
 33
 34	obj = mfbdev->mfb.obj;
 35	bo = gem_to_mga_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	if (drm_can_sleep())
 43		ret = mgag200_bo_reserve(bo, true);
 44	if (ret) {
 45		if (ret != -EBUSY)
 46			return;
 47
 48		store_for_later = true;
 49	}
 50
 51	x2 = x + width - 1;
 52	y2 = y + height - 1;
 53	spin_lock_irqsave(&mfbdev->dirty_lock, flags);
 54
 55	if (mfbdev->y1 < y)
 56		y = mfbdev->y1;
 57	if (mfbdev->y2 > y2)
 58		y2 = mfbdev->y2;
 59	if (mfbdev->x1 < x)
 60		x = mfbdev->x1;
 61	if (mfbdev->x2 > x2)
 62		x2 = mfbdev->x2;
 63
 64	if (store_for_later) {
 65		mfbdev->x1 = x;
 66		mfbdev->x2 = x2;
 67		mfbdev->y1 = y;
 68		mfbdev->y2 = y2;
 69		spin_unlock_irqrestore(&mfbdev->dirty_lock, flags);
 70		return;
 71	}
 72
 73	mfbdev->x1 = mfbdev->y1 = INT_MAX;
 74	mfbdev->x2 = mfbdev->y2 = 0;
 75	spin_unlock_irqrestore(&mfbdev->dirty_lock, flags);
 76
 77	if (!bo->kmap.virtual) {
 78		ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages, &bo->kmap);
 79		if (ret) {
 80			DRM_ERROR("failed to kmap fb updates\n");
 81			mgag200_bo_unreserve(bo);
 82			return;
 83		}
 84		unmap = true;
 85	}
 86	for (i = y; i <= y2; i++) {
 87		/* assume equal stride for now */
 88		src_offset = dst_offset = i * mfbdev->mfb.base.pitches[0] + (x * bpp);
 89		memcpy_toio(bo->kmap.virtual + src_offset, mfbdev->sysram + src_offset, (x2 - x + 1) * bpp);
 90
 91	}
 92	if (unmap)
 93		ttm_bo_kunmap(&bo->kmap);
 94
 95	mgag200_bo_unreserve(bo);
 96}
 97
 98static void mga_fillrect(struct fb_info *info,
 99			 const struct fb_fillrect *rect)
100{
101	struct mga_fbdev *mfbdev = info->par;
102	drm_fb_helper_sys_fillrect(info, rect);
103	mga_dirty_update(mfbdev, rect->dx, rect->dy, rect->width,
104			 rect->height);
105}
106
107static void mga_copyarea(struct fb_info *info,
108			 const struct fb_copyarea *area)
109{
110	struct mga_fbdev *mfbdev = info->par;
111	drm_fb_helper_sys_copyarea(info, area);
112	mga_dirty_update(mfbdev, area->dx, area->dy, area->width,
113			 area->height);
114}
115
116static void mga_imageblit(struct fb_info *info,
117			  const struct fb_image *image)
118{
119	struct mga_fbdev *mfbdev = info->par;
120	drm_fb_helper_sys_imageblit(info, image);
121	mga_dirty_update(mfbdev, image->dx, image->dy, image->width,
122			 image->height);
123}
124
125
126static struct fb_ops mgag200fb_ops = {
127	.owner = THIS_MODULE,
128	.fb_check_var = drm_fb_helper_check_var,
129	.fb_set_par = drm_fb_helper_set_par,
130	.fb_fillrect = mga_fillrect,
131	.fb_copyarea = mga_copyarea,
132	.fb_imageblit = mga_imageblit,
133	.fb_pan_display = drm_fb_helper_pan_display,
134	.fb_blank = drm_fb_helper_blank,
135	.fb_setcmap = drm_fb_helper_setcmap,
136};
137
138static int mgag200fb_create_object(struct mga_fbdev *afbdev,
139				   const struct drm_mode_fb_cmd2 *mode_cmd,
140				   struct drm_gem_object **gobj_p)
141{
142	struct drm_device *dev = afbdev->helper.dev;
143	u32 size;
144	struct drm_gem_object *gobj;
145	int ret = 0;
146
147	size = mode_cmd->pitches[0] * mode_cmd->height;
148	ret = mgag200_gem_create(dev, size, true, &gobj);
149	if (ret)
150		return ret;
151
152	*gobj_p = gobj;
153	return ret;
154}
155
156static int mgag200fb_create(struct drm_fb_helper *helper,
157			   struct drm_fb_helper_surface_size *sizes)
158{
159	struct mga_fbdev *mfbdev =
160		container_of(helper, struct mga_fbdev, helper);
161	struct drm_device *dev = mfbdev->helper.dev;
162	struct drm_mode_fb_cmd2 mode_cmd;
163	struct mga_device *mdev = dev->dev_private;
164	struct fb_info *info;
165	struct drm_framebuffer *fb;
166	struct drm_gem_object *gobj = NULL;
167	int ret;
168	void *sysram;
169	int size;
170
171	mode_cmd.width = sizes->surface_width;
172	mode_cmd.height = sizes->surface_height;
173	mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8);
174
175	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
176							  sizes->surface_depth);
177	size = mode_cmd.pitches[0] * mode_cmd.height;
178
179	ret = mgag200fb_create_object(mfbdev, &mode_cmd, &gobj);
180	if (ret) {
181		DRM_ERROR("failed to create fbcon backing object %d\n", ret);
182		return ret;
183	}
184
185	sysram = vmalloc(size);
186	if (!sysram) {
187		ret = -ENOMEM;
188		goto err_sysram;
189	}
190
191	info = drm_fb_helper_alloc_fbi(helper);
192	if (IS_ERR(info)) {
193		ret = PTR_ERR(info);
194		goto err_alloc_fbi;
195	}
196
197	info->par = mfbdev;
198
199	ret = mgag200_framebuffer_init(dev, &mfbdev->mfb, &mode_cmd, gobj);
200	if (ret)
201		goto err_alloc_fbi;
202
203	mfbdev->sysram = sysram;
204	mfbdev->size = size;
205
206	fb = &mfbdev->mfb.base;
207
208	/* setup helper */
209	mfbdev->helper.fb = fb;
210
211	strcpy(info->fix.id, "mgadrmfb");
212
213	info->fbops = &mgag200fb_ops;
214
215	/* setup aperture base/size for vesafb takeover */
216	info->apertures->ranges[0].base = mdev->dev->mode_config.fb_base;
217	info->apertures->ranges[0].size = mdev->mc.vram_size;
218
219	drm_fb_helper_fill_fix(info, fb->pitches[0], fb->format->depth);
220	drm_fb_helper_fill_var(info, &mfbdev->helper, sizes->fb_width,
221			       sizes->fb_height);
222
223	info->screen_base = sysram;
224	info->screen_size = size;
225	info->pixmap.flags = FB_PIXMAP_SYSTEM;
226
227	DRM_DEBUG_KMS("allocated %dx%d\n",
228		      fb->width, fb->height);
229
230	return 0;
231
232err_alloc_fbi:
233	vfree(sysram);
234err_sysram:
235	drm_gem_object_put_unlocked(gobj);
236
237	return ret;
238}
239
240static int mga_fbdev_destroy(struct drm_device *dev,
241				struct mga_fbdev *mfbdev)
242{
243	struct mga_framebuffer *mfb = &mfbdev->mfb;
244
245	drm_fb_helper_unregister_fbi(&mfbdev->helper);
246
247	if (mfb->obj) {
248		drm_gem_object_put_unlocked(mfb->obj);
249		mfb->obj = NULL;
250	}
251	drm_fb_helper_fini(&mfbdev->helper);
252	vfree(mfbdev->sysram);
253	drm_framebuffer_unregister_private(&mfb->base);
254	drm_framebuffer_cleanup(&mfb->base);
255
256	return 0;
257}
258
259static const struct drm_fb_helper_funcs mga_fb_helper_funcs = {
260	.fb_probe = mgag200fb_create,
261};
262
263int mgag200_fbdev_init(struct mga_device *mdev)
264{
265	struct mga_fbdev *mfbdev;
266	int ret;
267	int bpp_sel = 32;
268
269	/* prefer 16bpp on low end gpus with limited VRAM */
270	if (IS_G200_SE(mdev) && mdev->mc.vram_size < (2048*1024))
271		bpp_sel = 16;
272
273	mfbdev = devm_kzalloc(mdev->dev->dev, sizeof(struct mga_fbdev), GFP_KERNEL);
274	if (!mfbdev)
275		return -ENOMEM;
276
277	mdev->mfbdev = mfbdev;
278	spin_lock_init(&mfbdev->dirty_lock);
279
280	drm_fb_helper_prepare(mdev->dev, &mfbdev->helper, &mga_fb_helper_funcs);
281
282	ret = drm_fb_helper_init(mdev->dev, &mfbdev->helper,
283				 MGAG200FB_CONN_LIMIT);
284	if (ret)
285		goto err_fb_helper;
286
287	ret = drm_fb_helper_single_add_all_connectors(&mfbdev->helper);
288	if (ret)
289		goto err_fb_setup;
290
291	/* disable all the possible outputs/crtcs before entering KMS mode */
292	drm_helper_disable_unused_functions(mdev->dev);
293
294	ret = drm_fb_helper_initial_config(&mfbdev->helper, bpp_sel);
295	if (ret)
296		goto err_fb_setup;
297
298	return 0;
299
300err_fb_setup:
301	drm_fb_helper_fini(&mfbdev->helper);
302err_fb_helper:
303	mdev->mfbdev = NULL;
304
305	return ret;
306}
307
308void mgag200_fbdev_fini(struct mga_device *mdev)
309{
310	if (!mdev->mfbdev)
311		return;
312
313	mga_fbdev_destroy(mdev->dev, mdev->mfbdev);
314}