1/*
  2 * Copyright 2012 Red Hat
  3 *
  4 * This file is subject to the terms and conditions of the GNU General
  5 * Public License version 2. See the file COPYING in the main
  6 * directory of this archive for more details.
  7 *
  8 * Authors: Matthew Garrett
  9 *          Dave Airlie
 10 */
 11#include <linux/module.h>
 12#include <drm/drmP.h>
 13#include <drm/drm_fb_helper.h>
 14#include <drm/drm_crtc_helper.h>
 15
 16#include "cirrus_drv.h"
 17
 18static void cirrus_dirty_update(struct cirrus_fbdev *afbdev,
 19			     int x, int y, int width, int height)
 20{
 21	int i;
 22	struct drm_gem_object *obj;
 23	struct cirrus_bo *bo;
 24	int src_offset, dst_offset;
 25	int bpp = (afbdev->gfb.base.bits_per_pixel + 7)/8;
 26	int ret = -EBUSY;
 27	bool unmap = false;
 28	bool store_for_later = false;
 29	int x2, y2;
 30	unsigned long flags;
 31
 32	obj = afbdev->gfb.obj;
 33	bo = gem_to_cirrus_bo(obj);
 34
 35	/*
 36	 * try and reserve the BO, if we fail with busy
 37	 * then the BO is being moved and we should
 38	 * store up the damage until later.
 39	 */
 40	if (drm_can_sleep())
 41		ret = cirrus_bo_reserve(bo, true);
 42	if (ret) {
 43		if (ret != -EBUSY)
 44			return;
 45		store_for_later = true;
 46	}
 47
 48	x2 = x + width - 1;
 49	y2 = y + height - 1;
 50	spin_lock_irqsave(&afbdev->dirty_lock, flags);
 51
 52	if (afbdev->y1 < y)
 53		y = afbdev->y1;
 54	if (afbdev->y2 > y2)
 55		y2 = afbdev->y2;
 56	if (afbdev->x1 < x)
 57		x = afbdev->x1;
 58	if (afbdev->x2 > x2)
 59		x2 = afbdev->x2;
 60
 61	if (store_for_later) {
 62		afbdev->x1 = x;
 63		afbdev->x2 = x2;
 64		afbdev->y1 = y;
 65		afbdev->y2 = y2;
 66		spin_unlock_irqrestore(&afbdev->dirty_lock, flags);
 67		return;
 68	}
 69
 70	afbdev->x1 = afbdev->y1 = INT_MAX;
 71	afbdev->x2 = afbdev->y2 = 0;
 72	spin_unlock_irqrestore(&afbdev->dirty_lock, flags);
 73
 74	if (!bo->kmap.virtual) {
 75		ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages, &bo->kmap);
 76		if (ret) {
 77			DRM_ERROR("failed to kmap fb updates\n");
 78			cirrus_bo_unreserve(bo);
 79			return;
 80		}
 81		unmap = true;
 82	}
 83	for (i = y; i < y + height; i++) {
 84		/* assume equal stride for now */
 85		src_offset = dst_offset = i * afbdev->gfb.base.pitches[0] + (x * bpp);
 86		memcpy_toio(bo->kmap.virtual + src_offset, afbdev->sysram + src_offset, width * bpp);
 87
 88	}
 89	if (unmap)
 90		ttm_bo_kunmap(&bo->kmap);
 91
 92	cirrus_bo_unreserve(bo);
 93}
 94
 95static void cirrus_fillrect(struct fb_info *info,
 96			 const struct fb_fillrect *rect)
 97{
 98	struct cirrus_fbdev *afbdev = info->par;
 99	drm_fb_helper_sys_fillrect(info, rect);
100	cirrus_dirty_update(afbdev, rect->dx, rect->dy, rect->width,
101			 rect->height);
102}
103
104static void cirrus_copyarea(struct fb_info *info,
105			 const struct fb_copyarea *area)
106{
107	struct cirrus_fbdev *afbdev = info->par;
108	drm_fb_helper_sys_copyarea(info, area);
109	cirrus_dirty_update(afbdev, area->dx, area->dy, area->width,
110			 area->height);
111}
112
113static void cirrus_imageblit(struct fb_info *info,
114			  const struct fb_image *image)
115{
116	struct cirrus_fbdev *afbdev = info->par;
117	drm_fb_helper_sys_imageblit(info, image);
118	cirrus_dirty_update(afbdev, image->dx, image->dy, image->width,
119			 image->height);
120}
121
122
123static struct fb_ops cirrusfb_ops = {
124	.owner = THIS_MODULE,
125	.fb_check_var = drm_fb_helper_check_var,
126	.fb_set_par = drm_fb_helper_set_par,
127	.fb_fillrect = cirrus_fillrect,
128	.fb_copyarea = cirrus_copyarea,
129	.fb_imageblit = cirrus_imageblit,
130	.fb_pan_display = drm_fb_helper_pan_display,
131	.fb_blank = drm_fb_helper_blank,
132	.fb_setcmap = drm_fb_helper_setcmap,
133};
134
135static int cirrusfb_create_object(struct cirrus_fbdev *afbdev,
136			       const struct drm_mode_fb_cmd2 *mode_cmd,
137			       struct drm_gem_object **gobj_p)
138{
139	struct drm_device *dev = afbdev->helper.dev;
140	struct cirrus_device *cdev = dev->dev_private;
141	u32 bpp;
142	u32 size;
143	struct drm_gem_object *gobj;
144	int ret = 0;
145
146	bpp = drm_format_plane_cpp(mode_cmd->pixel_format, 0) * 8;
147
148	if (!cirrus_check_framebuffer(cdev, mode_cmd->width, mode_cmd->height,
149				      bpp, mode_cmd->pitches[0]))
150		return -EINVAL;
151
152	size = mode_cmd->pitches[0] * mode_cmd->height;
153	ret = cirrus_gem_create(dev, size, true, &gobj);
154	if (ret)
155		return ret;
156
157	*gobj_p = gobj;
158	return ret;
159}
160
161static int cirrusfb_create(struct drm_fb_helper *helper,
162			   struct drm_fb_helper_surface_size *sizes)
163{
164	struct cirrus_fbdev *gfbdev =
165		container_of(helper, struct cirrus_fbdev, helper);
166	struct cirrus_device *cdev = gfbdev->helper.dev->dev_private;
167	struct fb_info *info;
168	struct drm_framebuffer *fb;
169	struct drm_mode_fb_cmd2 mode_cmd;
170	void *sysram;
171	struct drm_gem_object *gobj = NULL;
172	struct cirrus_bo *bo = NULL;
173	int size, ret;
174
175	mode_cmd.width = sizes->surface_width;
176	mode_cmd.height = sizes->surface_height;
177	mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8);
178	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
179							  sizes->surface_depth);
180	size = mode_cmd.pitches[0] * mode_cmd.height;
181
182	ret = cirrusfb_create_object(gfbdev, &mode_cmd, &gobj);
183	if (ret) {
184		DRM_ERROR("failed to create fbcon backing object %d\n", ret);
185		return ret;
186	}
187
188	bo = gem_to_cirrus_bo(gobj);
189
190	sysram = vmalloc(size);
191	if (!sysram)
192		return -ENOMEM;
193
194	info = drm_fb_helper_alloc_fbi(helper);
195	if (IS_ERR(info))
196		return PTR_ERR(info);
197
198	info->par = gfbdev;
199
200	ret = cirrus_framebuffer_init(cdev->dev, &gfbdev->gfb, &mode_cmd, gobj);
201	if (ret)
202		return ret;
203
204	gfbdev->sysram = sysram;
205	gfbdev->size = size;
206
207	fb = &gfbdev->gfb.base;
208	if (!fb) {
209		DRM_INFO("fb is NULL\n");
210		return -EINVAL;
211	}
212
213	/* setup helper */
214	gfbdev->helper.fb = fb;
215
216	strcpy(info->fix.id, "cirrusdrmfb");
217
218	info->flags = FBINFO_DEFAULT;
219	info->fbops = &cirrusfb_ops;
220
221	drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
222	drm_fb_helper_fill_var(info, &gfbdev->helper, sizes->fb_width,
223			       sizes->fb_height);
224
225	/* setup aperture base/size for vesafb takeover */
226	info->apertures->ranges[0].base = cdev->dev->mode_config.fb_base;
227	info->apertures->ranges[0].size = cdev->mc.vram_size;
228
229	info->fix.smem_start = cdev->dev->mode_config.fb_base;
230	info->fix.smem_len = cdev->mc.vram_size;
231
232	info->screen_base = sysram;
233	info->screen_size = size;
234
235	info->fix.mmio_start = 0;
236	info->fix.mmio_len = 0;
237
238	DRM_INFO("fb mappable at 0x%lX\n", info->fix.smem_start);
239	DRM_INFO("vram aper at 0x%lX\n", (unsigned long)info->fix.smem_start);
240	DRM_INFO("size %lu\n", (unsigned long)info->fix.smem_len);
241	DRM_INFO("fb depth is %d\n", fb->depth);
242	DRM_INFO("   pitch is %d\n", fb->pitches[0]);
243
244	return 0;
245}
246
247static int cirrus_fbdev_destroy(struct drm_device *dev,
248				struct cirrus_fbdev *gfbdev)
249{
250	struct cirrus_framebuffer *gfb = &gfbdev->gfb;
251
252	drm_fb_helper_unregister_fbi(&gfbdev->helper);
253	drm_fb_helper_release_fbi(&gfbdev->helper);
254
255	if (gfb->obj) {
256		drm_gem_object_unreference_unlocked(gfb->obj);
257		gfb->obj = NULL;
258	}
259
260	vfree(gfbdev->sysram);
261	drm_fb_helper_fini(&gfbdev->helper);
262	drm_framebuffer_unregister_private(&gfb->base);
263	drm_framebuffer_cleanup(&gfb->base);
264
265	return 0;
266}
267
268static const struct drm_fb_helper_funcs cirrus_fb_helper_funcs = {
269	.gamma_set = cirrus_crtc_fb_gamma_set,
270	.gamma_get = cirrus_crtc_fb_gamma_get,
271	.fb_probe = cirrusfb_create,
272};
273
274int cirrus_fbdev_init(struct cirrus_device *cdev)
275{
276	struct cirrus_fbdev *gfbdev;
277	int ret;
278	int bpp_sel = 24;
279
280	/*bpp_sel = 8;*/
281	gfbdev = kzalloc(sizeof(struct cirrus_fbdev), GFP_KERNEL);
282	if (!gfbdev)
283		return -ENOMEM;
284
285	cdev->mode_info.gfbdev = gfbdev;
286	spin_lock_init(&gfbdev->dirty_lock);
287
288	drm_fb_helper_prepare(cdev->dev, &gfbdev->helper,
289			      &cirrus_fb_helper_funcs);
290
291	ret = drm_fb_helper_init(cdev->dev, &gfbdev->helper,
292				 cdev->num_crtc, CIRRUSFB_CONN_LIMIT);
293	if (ret)
294		return ret;
295
296	ret = drm_fb_helper_single_add_all_connectors(&gfbdev->helper);
297	if (ret)
298		return ret;
299
300	/* disable all the possible outputs/crtcs before entering KMS mode */
301	drm_helper_disable_unused_functions(cdev->dev);
302
303	return drm_fb_helper_initial_config(&gfbdev->helper, bpp_sel);
304}
305
306void cirrus_fbdev_fini(struct cirrus_device *cdev)
307{
308	if (!cdev->mode_info.gfbdev)
309		return;
310
311	cirrus_fbdev_destroy(cdev->dev, cdev->mode_info.gfbdev);
312	kfree(cdev->mode_info.gfbdev);
313	cdev->mode_info.gfbdev = NULL;
314}