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 <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 = -EBUSY;
 31	bool unmap = false;
 32	bool store_for_later = false;
 33	int x2, y2;
 34	unsigned long flags;
 35
 36	obj = mfbdev->mfb.obj;
 37	bo = gem_to_mga_bo(obj);
 38
 39	/*
 40	 * try and reserve the BO, if we fail with busy
 41	 * then the BO is being moved and we should
 42	 * store up the damage until later.
 43	 */
 44	if (drm_can_sleep())
 45		ret = mgag200_bo_reserve(bo, true);
 46	if (ret) {
 47		if (ret != -EBUSY)
 48			return;
 49
 50		store_for_later = true;
 51	}
 52
 53	x2 = x + width - 1;
 54	y2 = y + height - 1;
 55	spin_lock_irqsave(&mfbdev->dirty_lock, flags);
 56
 57	if (mfbdev->y1 < y)
 58		y = mfbdev->y1;
 59	if (mfbdev->y2 > y2)
 60		y2 = mfbdev->y2;
 61	if (mfbdev->x1 < x)
 62		x = mfbdev->x1;
 63	if (mfbdev->x2 > x2)
 64		x2 = mfbdev->x2;
 65
 66	if (store_for_later) {
 67		mfbdev->x1 = x;
 68		mfbdev->x2 = x2;
 69		mfbdev->y1 = y;
 70		mfbdev->y2 = y2;
 71		spin_unlock_irqrestore(&mfbdev->dirty_lock, flags);
 72		return;
 73	}
 74
 75	mfbdev->x1 = mfbdev->y1 = INT_MAX;
 76	mfbdev->x2 = mfbdev->y2 = 0;
 77	spin_unlock_irqrestore(&mfbdev->dirty_lock, flags);
 78
 79	if (!bo->kmap.virtual) {
 80		ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages, &bo->kmap);
 81		if (ret) {
 82			DRM_ERROR("failed to kmap fb updates\n");
 83			mgag200_bo_unreserve(bo);
 84			return;
 85		}
 86		unmap = true;
 87	}
 88	for (i = y; i <= y2; i++) {
 89		/* assume equal stride for now */
 90		src_offset = dst_offset = i * mfbdev->mfb.base.pitches[0] + (x * bpp);
 91		memcpy_toio(bo->kmap.virtual + src_offset, mfbdev->sysram + src_offset, (x2 - x + 1) * bpp);
 92
 93	}
 94	if (unmap)
 95		ttm_bo_kunmap(&bo->kmap);
 96
 97	mgag200_bo_unreserve(bo);
 98}
 99
100static void mga_fillrect(struct fb_info *info,
101			 const struct fb_fillrect *rect)
102{
103	struct mga_fbdev *mfbdev = info->par;
104	drm_fb_helper_sys_fillrect(info, rect);
105	mga_dirty_update(mfbdev, rect->dx, rect->dy, rect->width,
106			 rect->height);
107}
108
109static void mga_copyarea(struct fb_info *info,
110			 const struct fb_copyarea *area)
111{
112	struct mga_fbdev *mfbdev = info->par;
113	drm_fb_helper_sys_copyarea(info, area);
114	mga_dirty_update(mfbdev, area->dx, area->dy, area->width,
115			 area->height);
116}
117
118static void mga_imageblit(struct fb_info *info,
119			  const struct fb_image *image)
120{
121	struct mga_fbdev *mfbdev = info->par;
122	drm_fb_helper_sys_imageblit(info, image);
123	mga_dirty_update(mfbdev, image->dx, image->dy, image->width,
124			 image->height);
125}
126
127
128static struct fb_ops mgag200fb_ops = {
129	.owner = THIS_MODULE,
130	.fb_check_var = drm_fb_helper_check_var,
131	.fb_set_par = drm_fb_helper_set_par,
132	.fb_fillrect = mga_fillrect,
133	.fb_copyarea = mga_copyarea,
134	.fb_imageblit = mga_imageblit,
135	.fb_pan_display = drm_fb_helper_pan_display,
136	.fb_blank = drm_fb_helper_blank,
137	.fb_setcmap = drm_fb_helper_setcmap,
138};
139
140static int mgag200fb_create_object(struct mga_fbdev *afbdev,
141				   const struct drm_mode_fb_cmd2 *mode_cmd,
142				   struct drm_gem_object **gobj_p)
143{
144	struct drm_device *dev = afbdev->helper.dev;
145	u32 size;
146	struct drm_gem_object *gobj;
147	int ret = 0;
148
149	size = mode_cmd->pitches[0] * mode_cmd->height;
150	ret = mgag200_gem_create(dev, size, true, &gobj);
151	if (ret)
152		return ret;
153
154	*gobj_p = gobj;
155	return ret;
156}
157
158static int mgag200fb_create(struct drm_fb_helper *helper,
159			   struct drm_fb_helper_surface_size *sizes)
160{
161	struct mga_fbdev *mfbdev =
162		container_of(helper, struct mga_fbdev, helper);
163	struct drm_device *dev = mfbdev->helper.dev;
164	struct drm_mode_fb_cmd2 mode_cmd;
165	struct mga_device *mdev = dev->dev_private;
166	struct fb_info *info;
167	struct drm_framebuffer *fb;
168	struct drm_gem_object *gobj = NULL;
169	int ret;
170	void *sysram;
171	int size;
172
173	mode_cmd.width = sizes->surface_width;
174	mode_cmd.height = sizes->surface_height;
175	mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8);
176
177	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
178							  sizes->surface_depth);
179	size = mode_cmd.pitches[0] * mode_cmd.height;
180
181	ret = mgag200fb_create_object(mfbdev, &mode_cmd, &gobj);
182	if (ret) {
183		DRM_ERROR("failed to create fbcon backing object %d\n", ret);
184		return ret;
185	}
186
187	sysram = vmalloc(size);
188	if (!sysram)
189		goto err_sysram;
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_framebuffer_init;
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->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
214	info->fbops = &mgag200fb_ops;
215
216	/* setup aperture base/size for vesafb takeover */
217	info->apertures->ranges[0].base = mdev->dev->mode_config.fb_base;
218	info->apertures->ranges[0].size = mdev->mc.vram_size;
219
220	drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
221	drm_fb_helper_fill_var(info, &mfbdev->helper, sizes->fb_width,
222			       sizes->fb_height);
223
224	info->screen_base = sysram;
225	info->screen_size = size;
226	info->pixmap.flags = FB_PIXMAP_SYSTEM;
227
228	DRM_DEBUG_KMS("allocated %dx%d\n",
229		      fb->width, fb->height);
230
231	return 0;
232
233err_framebuffer_init:
234	drm_fb_helper_release_fbi(helper);
235err_alloc_fbi:
236	vfree(sysram);
237err_sysram:
238	drm_gem_object_unreference_unlocked(gobj);
239
240	return ret;
241}
242
243static int mga_fbdev_destroy(struct drm_device *dev,
244				struct mga_fbdev *mfbdev)
245{
246	struct mga_framebuffer *mfb = &mfbdev->mfb;
247
248	drm_fb_helper_unregister_fbi(&mfbdev->helper);
249	drm_fb_helper_release_fbi(&mfbdev->helper);
250
251	if (mfb->obj) {
252		drm_gem_object_unreference_unlocked(mfb->obj);
253		mfb->obj = NULL;
254	}
255	drm_fb_helper_fini(&mfbdev->helper);
256	vfree(mfbdev->sysram);
257	drm_framebuffer_unregister_private(&mfb->base);
258	drm_framebuffer_cleanup(&mfb->base);
259
260	return 0;
261}
262
263static const struct drm_fb_helper_funcs mga_fb_helper_funcs = {
264	.gamma_set = mga_crtc_fb_gamma_set,
265	.gamma_get = mga_crtc_fb_gamma_get,
266	.fb_probe = mgag200fb_create,
267};
268
269int mgag200_fbdev_init(struct mga_device *mdev)
270{
271	struct mga_fbdev *mfbdev;
272	int ret;
273	int bpp_sel = 32;
274
275	/* prefer 16bpp on low end gpus with limited VRAM */
276	if (IS_G200_SE(mdev) && mdev->mc.vram_size < (2048*1024))
277		bpp_sel = 16;
278
279	mfbdev = devm_kzalloc(mdev->dev->dev, sizeof(struct mga_fbdev), GFP_KERNEL);
280	if (!mfbdev)
281		return -ENOMEM;
282
283	mdev->mfbdev = mfbdev;
284	spin_lock_init(&mfbdev->dirty_lock);
285
286	drm_fb_helper_prepare(mdev->dev, &mfbdev->helper, &mga_fb_helper_funcs);
287
288	ret = drm_fb_helper_init(mdev->dev, &mfbdev->helper,
289				 mdev->num_crtc, MGAG200FB_CONN_LIMIT);
290	if (ret)
291		goto err_fb_helper;
292
293	ret = drm_fb_helper_single_add_all_connectors(&mfbdev->helper);
294	if (ret)
295		goto err_fb_setup;
296
297	/* disable all the possible outputs/crtcs before entering KMS mode */
298	drm_helper_disable_unused_functions(mdev->dev);
299
300	ret = drm_fb_helper_initial_config(&mfbdev->helper, bpp_sel);
301	if (ret)
302		goto err_fb_setup;
303
304	return 0;
305
306err_fb_setup:
307	drm_fb_helper_fini(&mfbdev->helper);
308err_fb_helper:
309	mdev->mfbdev = NULL;
310
311	return ret;
312}
313
314void mgag200_fbdev_fini(struct mga_device *mdev)
315{
316	if (!mdev->mfbdev)
317		return;
318
319	mga_fbdev_destroy(mdev->dev, mdev->mfbdev);
320}