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	drm_fb_helper_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	drm_fb_helper_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	drm_fb_helper_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			       const 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	void *sysram;
197	struct drm_gem_object *gobj = NULL;
198	struct ast_bo *bo = NULL;
199	mode_cmd.width = sizes->surface_width;
200	mode_cmd.height = sizes->surface_height;
201	mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7)/8);
202
203	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
204							  sizes->surface_depth);
205
206	size = mode_cmd.pitches[0] * mode_cmd.height;
207
208	ret = astfb_create_object(afbdev, &mode_cmd, &gobj);
209	if (ret) {
210		DRM_ERROR("failed to create fbcon backing object %d\n", ret);
211		return ret;
212	}
213	bo = gem_to_ast_bo(gobj);
214
215	sysram = vmalloc(size);
216	if (!sysram)
217		return -ENOMEM;
218
219	info = drm_fb_helper_alloc_fbi(helper);
220	if (IS_ERR(info)) {
221		ret = PTR_ERR(info);
222		goto err_free_vram;
223	}
224	info->par = afbdev;
225
226	ret = ast_framebuffer_init(dev, &afbdev->afb, &mode_cmd, gobj);
227	if (ret)
228		goto err_release_fbi;
229
230	afbdev->sysram = sysram;
231	afbdev->size = size;
232
233	fb = &afbdev->afb.base;
234	afbdev->helper.fb = fb;
235
236	strcpy(info->fix.id, "astdrmfb");
237
238	info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
239	info->fbops = &astfb_ops;
240
241	info->apertures->ranges[0].base = pci_resource_start(dev->pdev, 0);
242	info->apertures->ranges[0].size = pci_resource_len(dev->pdev, 0);
243
244	drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
245	drm_fb_helper_fill_var(info, &afbdev->helper, sizes->fb_width, sizes->fb_height);
246
247	info->screen_base = sysram;
248	info->screen_size = size;
249
250	info->pixmap.flags = FB_PIXMAP_SYSTEM;
251
252	DRM_DEBUG_KMS("allocated %dx%d\n",
253		      fb->width, fb->height);
254
255	return 0;
256
257err_release_fbi:
258	drm_fb_helper_release_fbi(helper);
259err_free_vram:
260	vfree(afbdev->sysram);
261	return ret;
262}
263
264static void ast_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
265			       u16 blue, int regno)
266{
267	struct ast_crtc *ast_crtc = to_ast_crtc(crtc);
268	ast_crtc->lut_r[regno] = red >> 8;
269	ast_crtc->lut_g[regno] = green >> 8;
270	ast_crtc->lut_b[regno] = blue >> 8;
271}
272
273static void ast_fb_gamma_get(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	*red = ast_crtc->lut_r[regno] << 8;
278	*green = ast_crtc->lut_g[regno] << 8;
279	*blue = ast_crtc->lut_b[regno] << 8;
280}
281
282static const struct drm_fb_helper_funcs ast_fb_helper_funcs = {
283	.gamma_set = ast_fb_gamma_set,
284	.gamma_get = ast_fb_gamma_get,
285	.fb_probe = astfb_create,
286};
287
288static void ast_fbdev_destroy(struct drm_device *dev,
289			      struct ast_fbdev *afbdev)
290{
291	struct ast_framebuffer *afb = &afbdev->afb;
292
293	drm_fb_helper_unregister_fbi(&afbdev->helper);
294	drm_fb_helper_release_fbi(&afbdev->helper);
295
296	if (afb->obj) {
297		drm_gem_object_unreference_unlocked(afb->obj);
298		afb->obj = NULL;
299	}
300	drm_fb_helper_fini(&afbdev->helper);
301
302	vfree(afbdev->sysram);
303	drm_framebuffer_unregister_private(&afb->base);
304	drm_framebuffer_cleanup(&afb->base);
305}
306
307int ast_fbdev_init(struct drm_device *dev)
308{
309	struct ast_private *ast = dev->dev_private;
310	struct ast_fbdev *afbdev;
311	int ret;
312
313	afbdev = kzalloc(sizeof(struct ast_fbdev), GFP_KERNEL);
314	if (!afbdev)
315		return -ENOMEM;
316
317	ast->fbdev = afbdev;
318	spin_lock_init(&afbdev->dirty_lock);
319
320	drm_fb_helper_prepare(dev, &afbdev->helper, &ast_fb_helper_funcs);
321
322	ret = drm_fb_helper_init(dev, &afbdev->helper,
323				 1, 1);
324	if (ret)
325		goto free;
326
327	ret = drm_fb_helper_single_add_all_connectors(&afbdev->helper);
328	if (ret)
329		goto fini;
330
331	/* disable all the possible outputs/crtcs before entering KMS mode */
332	drm_helper_disable_unused_functions(dev);
333
334	ret = drm_fb_helper_initial_config(&afbdev->helper, 32);
335	if (ret)
336		goto fini;
337
338	return 0;
339
340fini:
341	drm_fb_helper_fini(&afbdev->helper);
342free:
343	kfree(afbdev);
344	return ret;
345}
346
347void ast_fbdev_fini(struct drm_device *dev)
348{
349	struct ast_private *ast = dev->dev_private;
350
351	if (!ast->fbdev)
352		return;
353
354	ast_fbdev_destroy(dev, ast->fbdev);
355	kfree(ast->fbdev);
356	ast->fbdev = NULL;
357}
358
359void ast_fbdev_set_suspend(struct drm_device *dev, int state)
360{
361	struct ast_private *ast = dev->dev_private;
362
363	if (!ast->fbdev)
364		return;
365
366	drm_fb_helper_set_suspend(&ast->fbdev->helper, state);
367}
368
369void ast_fbdev_set_base(struct ast_private *ast, unsigned long gpu_addr)
370{
371	ast->fbdev->helper.fbdev->fix.smem_start =
372		ast->fbdev->helper.fbdev->apertures->ranges[0].base + gpu_addr;
373	ast->fbdev->helper.fbdev->fix.smem_len = ast->vram_size - gpu_addr;
374}