1/*
2 * Copyright 2012 Red Hat Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the
6 * "Software"), to deal in the Software without restriction, including
7 * without limitation the rights to use, copy, modify, merge, publish,
8 * distribute, sub license, and/or sell copies of the Software, and to
9 * permit persons to whom the Software is furnished to do so, subject to
10 * the following conditions:
11 *
12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
13 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
14 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
15 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
16 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
17 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
18 * USE OR OTHER DEALINGS IN THE SOFTWARE.
19 *
20 * The above copyright notice and this permission notice (including the
21 * next paragraph) shall be included in all copies or substantial portions
22 * of the Software.
23 *
24 */
25/*
26 * Authors: Dave Airlie <airlied@redhat.com>
27 */
28#include <linux/module.h>
29#include <linux/kernel.h>
30#include <linux/errno.h>
31#include <linux/string.h>
32#include <linux/mm.h>
33#include <linux/tty.h>
34#include <linux/sysrq.h>
35#include <linux/delay.h>
36#include <linux/fb.h>
37#include <linux/init.h>
38
39
40#include <drm/drmP.h>
41#include <drm/drm_crtc.h>
42#include <drm/drm_fb_helper.h>
43#include <drm/drm_crtc_helper.h>
44#include "ast_drv.h"
45
46static void ast_dirty_update(struct ast_fbdev *afbdev,
47			     int x, int y, int width, int height)
48{
49	int i;
50	struct drm_gem_object *obj;
51	struct ast_bo *bo;
52	int src_offset, dst_offset;
53	int bpp = (afbdev->afb.base.bits_per_pixel + 7)/8;
54	int ret = -EBUSY;
55	bool unmap = false;
56	bool store_for_later = false;
57	int x2, y2;
58	unsigned long flags;
59
60	obj = afbdev->afb.obj;
61	bo = gem_to_ast_bo(obj);
62
63	/*
64	 * try and reserve the BO, if we fail with busy
65	 * then the BO is being moved and we should
66	 * store up the damage until later.
67	 */
68	if (drm_can_sleep())
69		ret = ast_bo_reserve(bo, true);
70	if (ret) {
71		if (ret != -EBUSY)
72			return;
73
74		store_for_later = true;
75	}
76
77	x2 = x + width - 1;
78	y2 = y + height - 1;
79	spin_lock_irqsave(&afbdev->dirty_lock, flags);
80
81	if (afbdev->y1 < y)
82		y = afbdev->y1;
83	if (afbdev->y2 > y2)
84		y2 = afbdev->y2;
85	if (afbdev->x1 < x)
86		x = afbdev->x1;
87	if (afbdev->x2 > x2)
88		x2 = afbdev->x2;
89
90	if (store_for_later) {
91		afbdev->x1 = x;
92		afbdev->x2 = x2;
93		afbdev->y1 = y;
94		afbdev->y2 = y2;
95		spin_unlock_irqrestore(&afbdev->dirty_lock, flags);
96		return;
97	}
98
99	afbdev->x1 = afbdev->y1 = INT_MAX;
100	afbdev->x2 = afbdev->y2 = 0;
101	spin_unlock_irqrestore(&afbdev->dirty_lock, flags);
102
103	if (!bo->kmap.virtual) {
104		ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages, &bo->kmap);
105		if (ret) {
106			DRM_ERROR("failed to kmap fb updates\n");
107			ast_bo_unreserve(bo);
108			return;
109		}
110		unmap = true;
111	}
112	for (i = y; i <= y2; i++) {
113		/* assume equal stride for now */
114		src_offset = dst_offset = i * afbdev->afb.base.pitches[0] + (x * bpp);
115		memcpy_toio(bo->kmap.virtual + src_offset, afbdev->sysram + src_offset, (x2 - x + 1) * bpp);
116
117	}
118	if (unmap)
119		ttm_bo_kunmap(&bo->kmap);
120
121	ast_bo_unreserve(bo);
122}
123
124static void ast_fillrect(struct fb_info *info,
125			 const struct fb_fillrect *rect)
126{
127	struct ast_fbdev *afbdev = info->par;
128	sys_fillrect(info, rect);
129	ast_dirty_update(afbdev, rect->dx, rect->dy, rect->width,
130			 rect->height);
131}
132
133static void ast_copyarea(struct fb_info *info,
134			 const struct fb_copyarea *area)
135{
136	struct ast_fbdev *afbdev = info->par;
137	sys_copyarea(info, area);
138	ast_dirty_update(afbdev, area->dx, area->dy, area->width,
139			 area->height);
140}
141
142static void ast_imageblit(struct fb_info *info,
143			  const struct fb_image *image)
144{
145	struct ast_fbdev *afbdev = info->par;
146	sys_imageblit(info, image);
147	ast_dirty_update(afbdev, image->dx, image->dy, image->width,
148			 image->height);
149}
150
151static struct fb_ops astfb_ops = {
152	.owner = THIS_MODULE,
153	.fb_check_var = drm_fb_helper_check_var,
154	.fb_set_par = drm_fb_helper_set_par,
155	.fb_fillrect = ast_fillrect,
156	.fb_copyarea = ast_copyarea,
157	.fb_imageblit = ast_imageblit,
158	.fb_pan_display = drm_fb_helper_pan_display,
159	.fb_blank = drm_fb_helper_blank,
160	.fb_setcmap = drm_fb_helper_setcmap,
161	.fb_debug_enter = drm_fb_helper_debug_enter,
162	.fb_debug_leave = drm_fb_helper_debug_leave,
163};
164
165static int astfb_create_object(struct ast_fbdev *afbdev,
166			       struct drm_mode_fb_cmd2 *mode_cmd,
167			       struct drm_gem_object **gobj_p)
168{
169	struct drm_device *dev = afbdev->helper.dev;
170	u32 bpp, depth;
171	u32 size;
172	struct drm_gem_object *gobj;
173
174	int ret = 0;
175	drm_fb_get_bpp_depth(mode_cmd->pixel_format, &depth, &bpp);
176
177	size = mode_cmd->pitches[0] * mode_cmd->height;
178	ret = ast_gem_create(dev, size, true, &gobj);
179	if (ret)
180		return ret;
181
182	*gobj_p = gobj;
183	return ret;
184}
185
186static int astfb_create(struct drm_fb_helper *helper,
187			struct drm_fb_helper_surface_size *sizes)
188{
189	struct ast_fbdev *afbdev =
190		container_of(helper, struct ast_fbdev, helper);
191	struct drm_device *dev = afbdev->helper.dev;
192	struct drm_mode_fb_cmd2 mode_cmd;
193	struct drm_framebuffer *fb;
194	struct fb_info *info;
195	int size, ret;
196	struct device *device = &dev->pdev->dev;
197	void *sysram;
198	struct drm_gem_object *gobj = NULL;
199	struct ast_bo *bo = NULL;
200	mode_cmd.width = sizes->surface_width;
201	mode_cmd.height = sizes->surface_height;
202	mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7)/8);
203
204	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
205							  sizes->surface_depth);
206
207	size = mode_cmd.pitches[0] * mode_cmd.height;
208
209	ret = astfb_create_object(afbdev, &mode_cmd, &gobj);
210	if (ret) {
211		DRM_ERROR("failed to create fbcon backing object %d\n", ret);
212		return ret;
213	}
214	bo = gem_to_ast_bo(gobj);
215
216	sysram = vmalloc(size);
217	if (!sysram)
218		return -ENOMEM;
219
220	info = framebuffer_alloc(0, device);
221	if (!info) {
222		ret = -ENOMEM;
223		goto out;
224	}
225	info->par = afbdev;
226
227	ret = ast_framebuffer_init(dev, &afbdev->afb, &mode_cmd, gobj);
228	if (ret)
229		goto out;
230
231	afbdev->sysram = sysram;
232	afbdev->size = size;
233
234	fb = &afbdev->afb.base;
235	afbdev->helper.fb = fb;
236	afbdev->helper.fbdev = info;
237
238	strcpy(info->fix.id, "astdrmfb");
239
240	info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
241	info->fbops = &astfb_ops;
242
243	ret = fb_alloc_cmap(&info->cmap, 256, 0);
244	if (ret) {
245		ret = -ENOMEM;
246		goto out;
247	}
248
249	info->apertures = alloc_apertures(1);
250	if (!info->apertures) {
251		ret = -ENOMEM;
252		goto out;
253	}
254	info->apertures->ranges[0].base = pci_resource_start(dev->pdev, 0);
255	info->apertures->ranges[0].size = pci_resource_len(dev->pdev, 0);
256
257	drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
258	drm_fb_helper_fill_var(info, &afbdev->helper, sizes->fb_width, sizes->fb_height);
259
260	info->screen_base = sysram;
261	info->screen_size = size;
262
263	info->pixmap.flags = FB_PIXMAP_SYSTEM;
264
265	DRM_DEBUG_KMS("allocated %dx%d\n",
266		      fb->width, fb->height);
267
268	return 0;
269out:
270	return ret;
271}
272
273static void ast_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
274			       u16 blue, int regno)
275{
276	struct ast_crtc *ast_crtc = to_ast_crtc(crtc);
277	ast_crtc->lut_r[regno] = red >> 8;
278	ast_crtc->lut_g[regno] = green >> 8;
279	ast_crtc->lut_b[regno] = blue >> 8;
280}
281
282static void ast_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
283			       u16 *blue, int regno)
284{
285	struct ast_crtc *ast_crtc = to_ast_crtc(crtc);
286	*red = ast_crtc->lut_r[regno] << 8;
287	*green = ast_crtc->lut_g[regno] << 8;
288	*blue = ast_crtc->lut_b[regno] << 8;
289}
290
291static const struct drm_fb_helper_funcs ast_fb_helper_funcs = {
292	.gamma_set = ast_fb_gamma_set,
293	.gamma_get = ast_fb_gamma_get,
294	.fb_probe = astfb_create,
295};
296
297static void ast_fbdev_destroy(struct drm_device *dev,
298			      struct ast_fbdev *afbdev)
299{
300	struct fb_info *info;
301	struct ast_framebuffer *afb = &afbdev->afb;
302	if (afbdev->helper.fbdev) {
303		info = afbdev->helper.fbdev;
304		unregister_framebuffer(info);
305		if (info->cmap.len)
306			fb_dealloc_cmap(&info->cmap);
307		framebuffer_release(info);
308	}
309
310	if (afb->obj) {
311		drm_gem_object_unreference_unlocked(afb->obj);
312		afb->obj = NULL;
313	}
314	drm_fb_helper_fini(&afbdev->helper);
315
316	vfree(afbdev->sysram);
317	drm_framebuffer_unregister_private(&afb->base);
318	drm_framebuffer_cleanup(&afb->base);
319}
320
321int ast_fbdev_init(struct drm_device *dev)
322{
323	struct ast_private *ast = dev->dev_private;
324	struct ast_fbdev *afbdev;
325	int ret;
326
327	afbdev = kzalloc(sizeof(struct ast_fbdev), GFP_KERNEL);
328	if (!afbdev)
329		return -ENOMEM;
330
331	ast->fbdev = afbdev;
332	spin_lock_init(&afbdev->dirty_lock);
333
334	drm_fb_helper_prepare(dev, &afbdev->helper, &ast_fb_helper_funcs);
335
336	ret = drm_fb_helper_init(dev, &afbdev->helper,
337				 1, 1);
338	if (ret)
339		goto free;
340
341	ret = drm_fb_helper_single_add_all_connectors(&afbdev->helper);
342	if (ret)
343		goto fini;
344
345	/* disable all the possible outputs/crtcs before entering KMS mode */
346	drm_helper_disable_unused_functions(dev);
347
348	ret = drm_fb_helper_initial_config(&afbdev->helper, 32);
349	if (ret)
350		goto fini;
351
352	return 0;
353
354fini:
355	drm_fb_helper_fini(&afbdev->helper);
356free:
357	kfree(afbdev);
358	return ret;
359}
360
361void ast_fbdev_fini(struct drm_device *dev)
362{
363	struct ast_private *ast = dev->dev_private;
364
365	if (!ast->fbdev)
366		return;
367
368	ast_fbdev_destroy(dev, ast->fbdev);
369	kfree(ast->fbdev);
370	ast->fbdev = NULL;
371}
372
373void ast_fbdev_set_suspend(struct drm_device *dev, int state)
374{
375	struct ast_private *ast = dev->dev_private;
376
377	if (!ast->fbdev)
378		return;
379
380	fb_set_suspend(ast->fbdev->helper.fbdev, state);
381}
382