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/init.h>
 37
 38
 39#include <drm/drmP.h>
 40#include <drm/drm_crtc.h>
 41#include <drm/drm_fb_helper.h>
 42#include <drm/drm_crtc_helper.h>
 43#include "ast_drv.h"
 44
 45static void ast_dirty_update(struct ast_fbdev *afbdev,
 46			     int x, int y, int width, int height)
 47{
 48	int i;
 49	struct drm_gem_object *obj;
 50	struct ast_bo *bo;
 51	int src_offset, dst_offset;
 52	int bpp = (afbdev->afb.base.bits_per_pixel + 7)/8;
 53	int ret = -EBUSY;
 54	bool unmap = false;
 55	bool store_for_later = false;
 56	int x2, y2;
 57	unsigned long flags;
 58
 59	obj = afbdev->afb.obj;
 60	bo = gem_to_ast_bo(obj);
 61
 62	/*
 63	 * try and reserve the BO, if we fail with busy
 64	 * then the BO is being moved and we should
 65	 * store up the damage until later.
 66	 */
 67	if (drm_can_sleep())
 68		ret = ast_bo_reserve(bo, true);
 69	if (ret) {
 70		if (ret != -EBUSY)
 71			return;
 72
 73		store_for_later = true;
 74	}
 75
 76	x2 = x + width - 1;
 77	y2 = y + height - 1;
 78	spin_lock_irqsave(&afbdev->dirty_lock, flags);
 79
 80	if (afbdev->y1 < y)
 81		y = afbdev->y1;
 82	if (afbdev->y2 > y2)
 83		y2 = afbdev->y2;
 84	if (afbdev->x1 < x)
 85		x = afbdev->x1;
 86	if (afbdev->x2 > x2)
 87		x2 = afbdev->x2;
 88
 89	if (store_for_later) {
 90		afbdev->x1 = x;
 91		afbdev->x2 = x2;
 92		afbdev->y1 = y;
 93		afbdev->y2 = y2;
 94		spin_unlock_irqrestore(&afbdev->dirty_lock, flags);
 95		return;
 96	}
 97
 98	afbdev->x1 = afbdev->y1 = INT_MAX;
 99	afbdev->x2 = afbdev->y2 = 0;
100	spin_unlock_irqrestore(&afbdev->dirty_lock, flags);
101
102	if (!bo->kmap.virtual) {
103		ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages, &bo->kmap);
104		if (ret) {
105			DRM_ERROR("failed to kmap fb updates\n");
106			ast_bo_unreserve(bo);
107			return;
108		}
109		unmap = true;
110	}
111	for (i = y; i <= y2; i++) {
112		/* assume equal stride for now */
113		src_offset = dst_offset = i * afbdev->afb.base.pitches[0] + (x * bpp);
114		memcpy_toio(bo->kmap.virtual + src_offset, afbdev->sysram + src_offset, (x2 - x + 1) * bpp);
115
116	}
117	if (unmap)
118		ttm_bo_kunmap(&bo->kmap);
119
120	ast_bo_unreserve(bo);
121}
122
123static void ast_fillrect(struct fb_info *info,
124			 const struct fb_fillrect *rect)
125{
126	struct ast_fbdev *afbdev = info->par;
127	drm_fb_helper_sys_fillrect(info, rect);
128	ast_dirty_update(afbdev, rect->dx, rect->dy, rect->width,
129			 rect->height);
130}
131
132static void ast_copyarea(struct fb_info *info,
133			 const struct fb_copyarea *area)
134{
135	struct ast_fbdev *afbdev = info->par;
136	drm_fb_helper_sys_copyarea(info, area);
137	ast_dirty_update(afbdev, area->dx, area->dy, area->width,
138			 area->height);
139}
140
141static void ast_imageblit(struct fb_info *info,
142			  const struct fb_image *image)
143{
144	struct ast_fbdev *afbdev = info->par;
145	drm_fb_helper_sys_imageblit(info, image);
146	ast_dirty_update(afbdev, image->dx, image->dy, image->width,
147			 image->height);
148}
149
150static struct fb_ops astfb_ops = {
151	.owner = THIS_MODULE,
152	.fb_check_var = drm_fb_helper_check_var,
153	.fb_set_par = drm_fb_helper_set_par,
154	.fb_fillrect = ast_fillrect,
155	.fb_copyarea = ast_copyarea,
156	.fb_imageblit = ast_imageblit,
157	.fb_pan_display = drm_fb_helper_pan_display,
158	.fb_blank = drm_fb_helper_blank,
159	.fb_setcmap = drm_fb_helper_setcmap,
160	.fb_debug_enter = drm_fb_helper_debug_enter,
161	.fb_debug_leave = drm_fb_helper_debug_leave,
162};
163
164static int astfb_create_object(struct ast_fbdev *afbdev,
165			       const struct drm_mode_fb_cmd2 *mode_cmd,
166			       struct drm_gem_object **gobj_p)
167{
168	struct drm_device *dev = afbdev->helper.dev;
169	u32 size;
170	struct drm_gem_object *gobj;
171	int ret = 0;
172
173	size = mode_cmd->pitches[0] * mode_cmd->height;
174	ret = ast_gem_create(dev, size, true, &gobj);
175	if (ret)
176		return ret;
177
178	*gobj_p = gobj;
179	return ret;
180}
181
182static int astfb_create(struct drm_fb_helper *helper,
183			struct drm_fb_helper_surface_size *sizes)
184{
185	struct ast_fbdev *afbdev =
186		container_of(helper, struct ast_fbdev, helper);
187	struct drm_device *dev = afbdev->helper.dev;
188	struct drm_mode_fb_cmd2 mode_cmd;
189	struct drm_framebuffer *fb;
190	struct fb_info *info;
191	int size, ret;
192	void *sysram;
193	struct drm_gem_object *gobj = NULL;
194	struct ast_bo *bo = NULL;
195	mode_cmd.width = sizes->surface_width;
196	mode_cmd.height = sizes->surface_height;
197	mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7)/8);
198
199	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
200							  sizes->surface_depth);
201
202	size = mode_cmd.pitches[0] * mode_cmd.height;
203
204	ret = astfb_create_object(afbdev, &mode_cmd, &gobj);
205	if (ret) {
206		DRM_ERROR("failed to create fbcon backing object %d\n", ret);
207		return ret;
208	}
209	bo = gem_to_ast_bo(gobj);
210
211	sysram = vmalloc(size);
212	if (!sysram)
213		return -ENOMEM;
214
215	info = drm_fb_helper_alloc_fbi(helper);
216	if (IS_ERR(info)) {
217		ret = PTR_ERR(info);
218		goto err_free_vram;
219	}
220	info->par = afbdev;
221
222	ret = ast_framebuffer_init(dev, &afbdev->afb, &mode_cmd, gobj);
223	if (ret)
224		goto err_release_fbi;
225
226	afbdev->sysram = sysram;
227	afbdev->size = size;
228
229	fb = &afbdev->afb.base;
230	afbdev->helper.fb = fb;
231
232	strcpy(info->fix.id, "astdrmfb");
233
234	info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
235	info->fbops = &astfb_ops;
236
237	info->apertures->ranges[0].base = pci_resource_start(dev->pdev, 0);
238	info->apertures->ranges[0].size = pci_resource_len(dev->pdev, 0);
239
240	drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
241	drm_fb_helper_fill_var(info, &afbdev->helper, sizes->fb_width, sizes->fb_height);
242
243	info->screen_base = sysram;
244	info->screen_size = size;
245
246	info->pixmap.flags = FB_PIXMAP_SYSTEM;
247
248	DRM_DEBUG_KMS("allocated %dx%d\n",
249		      fb->width, fb->height);
250
251	return 0;
252
253err_release_fbi:
254	drm_fb_helper_release_fbi(helper);
255err_free_vram:
256	vfree(sysram);
257	return ret;
258}
259
260static void ast_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
261			       u16 blue, int regno)
262{
263	struct ast_crtc *ast_crtc = to_ast_crtc(crtc);
264	ast_crtc->lut_r[regno] = red >> 8;
265	ast_crtc->lut_g[regno] = green >> 8;
266	ast_crtc->lut_b[regno] = blue >> 8;
267}
268
269static void ast_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
270			       u16 *blue, int regno)
271{
272	struct ast_crtc *ast_crtc = to_ast_crtc(crtc);
273	*red = ast_crtc->lut_r[regno] << 8;
274	*green = ast_crtc->lut_g[regno] << 8;
275	*blue = ast_crtc->lut_b[regno] << 8;
276}
277
278static const struct drm_fb_helper_funcs ast_fb_helper_funcs = {
279	.gamma_set = ast_fb_gamma_set,
280	.gamma_get = ast_fb_gamma_get,
281	.fb_probe = astfb_create,
282};
283
284static void ast_fbdev_destroy(struct drm_device *dev,
285			      struct ast_fbdev *afbdev)
286{
287	struct ast_framebuffer *afb = &afbdev->afb;
288
289	drm_fb_helper_unregister_fbi(&afbdev->helper);
290	drm_fb_helper_release_fbi(&afbdev->helper);
291
292	if (afb->obj) {
293		drm_gem_object_unreference_unlocked(afb->obj);
294		afb->obj = NULL;
295	}
296	drm_fb_helper_fini(&afbdev->helper);
297
298	vfree(afbdev->sysram);
299	drm_framebuffer_unregister_private(&afb->base);
300	drm_framebuffer_cleanup(&afb->base);
301}
302
303int ast_fbdev_init(struct drm_device *dev)
304{
305	struct ast_private *ast = dev->dev_private;
306	struct ast_fbdev *afbdev;
307	int ret;
308
309	afbdev = kzalloc(sizeof(struct ast_fbdev), GFP_KERNEL);
310	if (!afbdev)
311		return -ENOMEM;
312
313	ast->fbdev = afbdev;
314	spin_lock_init(&afbdev->dirty_lock);
315
316	drm_fb_helper_prepare(dev, &afbdev->helper, &ast_fb_helper_funcs);
317
318	ret = drm_fb_helper_init(dev, &afbdev->helper,
319				 1, 1);
320	if (ret)
321		goto free;
322
323	ret = drm_fb_helper_single_add_all_connectors(&afbdev->helper);
324	if (ret)
325		goto fini;
326
327	/* disable all the possible outputs/crtcs before entering KMS mode */
328	drm_helper_disable_unused_functions(dev);
329
330	ret = drm_fb_helper_initial_config(&afbdev->helper, 32);
331	if (ret)
332		goto fini;
333
334	return 0;
335
336fini:
337	drm_fb_helper_fini(&afbdev->helper);
338free:
339	kfree(afbdev);
340	return ret;
341}
342
343void ast_fbdev_fini(struct drm_device *dev)
344{
345	struct ast_private *ast = dev->dev_private;
346
347	if (!ast->fbdev)
348		return;
349
350	ast_fbdev_destroy(dev, ast->fbdev);
351	kfree(ast->fbdev);
352	ast->fbdev = NULL;
353}
354
355void ast_fbdev_set_suspend(struct drm_device *dev, int state)
356{
357	struct ast_private *ast = dev->dev_private;
358
359	if (!ast->fbdev)
360		return;
361
362	drm_fb_helper_set_suspend(&ast->fbdev->helper, state);
363}
364
365void ast_fbdev_set_base(struct ast_private *ast, unsigned long gpu_addr)
366{
367	ast->fbdev->helper.fbdev->fix.smem_start =
368		ast->fbdev->helper.fbdev->apertures->ranges[0].base + gpu_addr;
369	ast->fbdev->helper.fbdev->fix.smem_len = ast->vram_size - gpu_addr;
370}