1 /*
2  * linux/drivers/video/omap2/dss/manager.c
3  *
4  * Copyright (C) 2009 Nokia Corporation
5  * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
6  *
7  * Some code and ideas taken from drivers/video/omap/ driver
8  * by Imre Deak.
9  *
10  * This program is free software; you can redistribute it and/or modify it
11  * under the terms of the GNU General Public License version 2 as published by
12  * the Free Software Foundation.
13  *
14  * This program is distributed in the hope that it will be useful, but WITHOUT
15  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
16  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
17  * more details.
18  *
19  * You should have received a copy of the GNU General Public License along with
20  * this program.  If not, see <http://www.gnu.org/licenses/>.
21  */
22 
23 #define DSS_SUBSYS_NAME "MANAGER"
24 
25 #include <linux/kernel.h>
26 #include <linux/slab.h>
27 #include <linux/module.h>
28 #include <linux/platform_device.h>
29 #include <linux/jiffies.h>
30 
31 #include <video/omapfb_dss.h>
32 
33 #include "dss.h"
34 #include "dss_features.h"
35 
36 static int num_managers;
37 static struct omap_overlay_manager *managers;
38 
39 int dss_init_overlay_managers(void)
40 {
41 	int i;
42 
43 	num_managers = dss_feat_get_num_mgrs();
44 
45 	managers = kcalloc(num_managers, sizeof(struct omap_overlay_manager),
46 			   GFP_KERNEL);
47 
48 	BUG_ON(managers == NULL);
49 
50 	for (i = 0; i < num_managers; ++i) {
51 		struct omap_overlay_manager *mgr = &managers[i];
52 
53 		switch (i) {
54 		case 0:
55 			mgr->name = "lcd";
56 			mgr->id = OMAP_DSS_CHANNEL_LCD;
57 			break;
58 		case 1:
59 			mgr->name = "tv";
60 			mgr->id = OMAP_DSS_CHANNEL_DIGIT;
61 			break;
62 		case 2:
63 			mgr->name = "lcd2";
64 			mgr->id = OMAP_DSS_CHANNEL_LCD2;
65 			break;
66 		case 3:
67 			mgr->name = "lcd3";
68 			mgr->id = OMAP_DSS_CHANNEL_LCD3;
69 			break;
70 		}
71 
72 		mgr->supported_displays =
73 			dss_feat_get_supported_displays(mgr->id);
74 		mgr->supported_outputs =
75 			dss_feat_get_supported_outputs(mgr->id);
76 
77 		INIT_LIST_HEAD(&mgr->overlays);
78 	}
79 
80 	return 0;
81 }
82 
83 int dss_init_overlay_managers_sysfs(struct platform_device *pdev)
84 {
85 	int i, r;
86 
87 	for (i = 0; i < num_managers; ++i) {
88 		struct omap_overlay_manager *mgr = &managers[i];
89 
90 		r = dss_manager_kobj_init(mgr, pdev);
91 		if (r)
92 			DSSERR("failed to create sysfs file\n");
93 	}
94 
95 	return 0;
96 }
97 
98 void dss_uninit_overlay_managers(void)
99 {
100 	kfree(managers);
101 	managers = NULL;
102 	num_managers = 0;
103 }
104 
105 void dss_uninit_overlay_managers_sysfs(struct platform_device *pdev)
106 {
107 	int i;
108 
109 	for (i = 0; i < num_managers; ++i) {
110 		struct omap_overlay_manager *mgr = &managers[i];
111 
112 		dss_manager_kobj_uninit(mgr);
113 	}
114 }
115 
116 int omap_dss_get_num_overlay_managers(void)
117 {
118 	return num_managers;
119 }
120 EXPORT_SYMBOL(omap_dss_get_num_overlay_managers);
121 
122 struct omap_overlay_manager *omap_dss_get_overlay_manager(int num)
123 {
124 	if (num >= num_managers)
125 		return NULL;
126 
127 	return &managers[num];
128 }
129 EXPORT_SYMBOL(omap_dss_get_overlay_manager);
130 
131 int dss_mgr_simple_check(struct omap_overlay_manager *mgr,
132 		const struct omap_overlay_manager_info *info)
133 {
134 	if (dss_has_feature(FEAT_ALPHA_FIXED_ZORDER)) {
135 		/*
136 		 * OMAP3 supports only graphics source transparency color key
137 		 * and alpha blending simultaneously. See TRM 15.4.2.4.2.2
138 		 * Alpha Mode.
139 		 */
140 		if (info->partial_alpha_enabled && info->trans_enabled
141 			&& info->trans_key_type != OMAP_DSS_COLOR_KEY_GFX_DST) {
142 			DSSERR("check_manager: illegal transparency key\n");
143 			return -EINVAL;
144 		}
145 	}
146 
147 	return 0;
148 }
149 
150 static int dss_mgr_check_zorder(struct omap_overlay_manager *mgr,
151 		struct omap_overlay_info **overlay_infos)
152 {
153 	struct omap_overlay *ovl1, *ovl2;
154 	struct omap_overlay_info *info1, *info2;
155 
156 	list_for_each_entry(ovl1, &mgr->overlays, list) {
157 		info1 = overlay_infos[ovl1->id];
158 
159 		if (info1 == NULL)
160 			continue;
161 
162 		list_for_each_entry(ovl2, &mgr->overlays, list) {
163 			if (ovl1 == ovl2)
164 				continue;
165 
166 			info2 = overlay_infos[ovl2->id];
167 
168 			if (info2 == NULL)
169 				continue;
170 
171 			if (info1->zorder == info2->zorder) {
172 				DSSERR("overlays %d and %d have the same "
173 						"zorder %d\n",
174 					ovl1->id, ovl2->id, info1->zorder);
175 				return -EINVAL;
176 			}
177 		}
178 	}
179 
180 	return 0;
181 }
182 
183 int dss_mgr_check_timings(struct omap_overlay_manager *mgr,
184 		const struct omap_video_timings *timings)
185 {
186 	if (!dispc_mgr_timings_ok(mgr->id, timings)) {
187 		DSSERR("check_manager: invalid timings\n");
188 		return -EINVAL;
189 	}
190 
191 	return 0;
192 }
193 
194 static int dss_mgr_check_lcd_config(struct omap_overlay_manager *mgr,
195 		const struct dss_lcd_mgr_config *config)
196 {
197 	struct dispc_clock_info cinfo = config->clock_info;
198 	int dl = config->video_port_width;
199 	bool stallmode = config->stallmode;
200 	bool fifohandcheck = config->fifohandcheck;
201 
202 	if (cinfo.lck_div < 1 || cinfo.lck_div > 255)
203 		return -EINVAL;
204 
205 	if (cinfo.pck_div < 1 || cinfo.pck_div > 255)
206 		return -EINVAL;
207 
208 	if (dl != 12 && dl != 16 && dl != 18 && dl != 24)
209 		return -EINVAL;
210 
211 	/* fifohandcheck should be used only with stallmode */
212 	if (!stallmode && fifohandcheck)
213 		return -EINVAL;
214 
215 	/*
216 	 * io pad mode can be only checked by using dssdev connected to the
217 	 * manager. Ignore checking these for now, add checks when manager
218 	 * is capable of holding information related to the connected interface
219 	 */
220 
221 	return 0;
222 }
223 
224 int dss_mgr_check(struct omap_overlay_manager *mgr,
225 		struct omap_overlay_manager_info *info,
226 		const struct omap_video_timings *mgr_timings,
227 		const struct dss_lcd_mgr_config *lcd_config,
228 		struct omap_overlay_info **overlay_infos)
229 {
230 	struct omap_overlay *ovl;
231 	int r;
232 
233 	if (dss_has_feature(FEAT_ALPHA_FREE_ZORDER)) {
234 		r = dss_mgr_check_zorder(mgr, overlay_infos);
235 		if (r)
236 			return r;
237 	}
238 
239 	r = dss_mgr_check_timings(mgr, mgr_timings);
240 	if (r)
241 		return r;
242 
243 	r = dss_mgr_check_lcd_config(mgr, lcd_config);
244 	if (r)
245 		return r;
246 
247 	list_for_each_entry(ovl, &mgr->overlays, list) {
248 		struct omap_overlay_info *oi;
249 		int r;
250 
251 		oi = overlay_infos[ovl->id];
252 
253 		if (oi == NULL)
254 			continue;
255 
256 		r = dss_ovl_check(ovl, oi, mgr_timings);
257 		if (r)
258 			return r;
259 	}
260 
261 	return 0;
262 }
263