1 /*
2 * linux/drivers/video/omap2/dss/core.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 "CORE"
24
25 #include <linux/kernel.h>
26 #include <linux/module.h>
27 #include <linux/clk.h>
28 #include <linux/err.h>
29 #include <linux/platform_device.h>
30 #include <linux/seq_file.h>
31 #include <linux/debugfs.h>
32 #include <linux/io.h>
33 #include <linux/device.h>
34 #include <linux/regulator/consumer.h>
35 #include <linux/suspend.h>
36 #include <linux/slab.h>
37
38 #include <video/omapdss.h>
39
40 #include "dss.h"
41 #include "dss_features.h"
42
43 static struct {
44 struct platform_device *pdev;
45
46 const char *default_display_name;
47 } core;
48
49 static char *def_disp_name;
50 module_param_named(def_disp, def_disp_name, charp, 0);
51 MODULE_PARM_DESC(def_disp, "default display name");
52
53 static bool dss_initialized;
54
omapdss_get_default_display_name(void)55 const char *omapdss_get_default_display_name(void)
56 {
57 return core.default_display_name;
58 }
59 EXPORT_SYMBOL(omapdss_get_default_display_name);
60
omapdss_get_version(void)61 enum omapdss_version omapdss_get_version(void)
62 {
63 struct omap_dss_board_info *pdata = core.pdev->dev.platform_data;
64 return pdata->version;
65 }
66 EXPORT_SYMBOL(omapdss_get_version);
67
omapdss_is_initialized(void)68 bool omapdss_is_initialized(void)
69 {
70 return dss_initialized;
71 }
72 EXPORT_SYMBOL(omapdss_is_initialized);
73
dss_get_core_pdev(void)74 struct platform_device *dss_get_core_pdev(void)
75 {
76 return core.pdev;
77 }
78
dss_dsi_enable_pads(int dsi_id,unsigned lane_mask)79 int dss_dsi_enable_pads(int dsi_id, unsigned lane_mask)
80 {
81 struct omap_dss_board_info *board_data = core.pdev->dev.platform_data;
82
83 if (!board_data->dsi_enable_pads)
84 return -ENOENT;
85
86 return board_data->dsi_enable_pads(dsi_id, lane_mask);
87 }
88
dss_dsi_disable_pads(int dsi_id,unsigned lane_mask)89 void dss_dsi_disable_pads(int dsi_id, unsigned lane_mask)
90 {
91 struct omap_dss_board_info *board_data = core.pdev->dev.platform_data;
92
93 if (!board_data->dsi_disable_pads)
94 return;
95
96 return board_data->dsi_disable_pads(dsi_id, lane_mask);
97 }
98
dss_set_min_bus_tput(struct device * dev,unsigned long tput)99 int dss_set_min_bus_tput(struct device *dev, unsigned long tput)
100 {
101 struct omap_dss_board_info *pdata = core.pdev->dev.platform_data;
102
103 if (pdata->set_min_bus_tput)
104 return pdata->set_min_bus_tput(dev, tput);
105 else
106 return 0;
107 }
108
109 #if defined(CONFIG_OMAP2_DSS_DEBUGFS)
dss_debug_show(struct seq_file * s,void * unused)110 static int dss_debug_show(struct seq_file *s, void *unused)
111 {
112 void (*func)(struct seq_file *) = s->private;
113 func(s);
114 return 0;
115 }
116
dss_debug_open(struct inode * inode,struct file * file)117 static int dss_debug_open(struct inode *inode, struct file *file)
118 {
119 return single_open(file, dss_debug_show, inode->i_private);
120 }
121
122 static const struct file_operations dss_debug_fops = {
123 .open = dss_debug_open,
124 .read = seq_read,
125 .llseek = seq_lseek,
126 .release = single_release,
127 };
128
129 static struct dentry *dss_debugfs_dir;
130
dss_initialize_debugfs(void)131 static int dss_initialize_debugfs(void)
132 {
133 dss_debugfs_dir = debugfs_create_dir("omapdss", NULL);
134 if (IS_ERR(dss_debugfs_dir)) {
135 int err = PTR_ERR(dss_debugfs_dir);
136 dss_debugfs_dir = NULL;
137 return err;
138 }
139
140 debugfs_create_file("clk", S_IRUGO, dss_debugfs_dir,
141 &dss_debug_dump_clocks, &dss_debug_fops);
142
143 return 0;
144 }
145
dss_uninitialize_debugfs(void)146 static void dss_uninitialize_debugfs(void)
147 {
148 if (dss_debugfs_dir)
149 debugfs_remove_recursive(dss_debugfs_dir);
150 }
151
dss_debugfs_create_file(const char * name,void (* write)(struct seq_file *))152 int dss_debugfs_create_file(const char *name, void (*write)(struct seq_file *))
153 {
154 struct dentry *d;
155
156 d = debugfs_create_file(name, S_IRUGO, dss_debugfs_dir,
157 write, &dss_debug_fops);
158
159 return PTR_ERR_OR_ZERO(d);
160 }
161 #else /* CONFIG_OMAP2_DSS_DEBUGFS */
dss_initialize_debugfs(void)162 static inline int dss_initialize_debugfs(void)
163 {
164 return 0;
165 }
dss_uninitialize_debugfs(void)166 static inline void dss_uninitialize_debugfs(void)
167 {
168 }
dss_debugfs_create_file(const char * name,void (* write)(struct seq_file *))169 int dss_debugfs_create_file(const char *name, void (*write)(struct seq_file *))
170 {
171 return 0;
172 }
173 #endif /* CONFIG_OMAP2_DSS_DEBUGFS */
174
175 /* PLATFORM DEVICE */
omap_dss_pm_notif(struct notifier_block * b,unsigned long v,void * d)176 static int omap_dss_pm_notif(struct notifier_block *b, unsigned long v, void *d)
177 {
178 DSSDBG("pm notif %lu\n", v);
179
180 switch (v) {
181 case PM_SUSPEND_PREPARE:
182 case PM_HIBERNATION_PREPARE:
183 case PM_RESTORE_PREPARE:
184 DSSDBG("suspending displays\n");
185 return dss_suspend_all_devices();
186
187 case PM_POST_SUSPEND:
188 case PM_POST_HIBERNATION:
189 case PM_POST_RESTORE:
190 DSSDBG("resuming displays\n");
191 return dss_resume_all_devices();
192
193 default:
194 return 0;
195 }
196 }
197
198 static struct notifier_block omap_dss_pm_notif_block = {
199 .notifier_call = omap_dss_pm_notif,
200 };
201
omap_dss_probe(struct platform_device * pdev)202 static int __init omap_dss_probe(struct platform_device *pdev)
203 {
204 struct omap_dss_board_info *pdata = pdev->dev.platform_data;
205 int r;
206
207 core.pdev = pdev;
208
209 dss_features_init(omapdss_get_version());
210
211 r = dss_initialize_debugfs();
212 if (r)
213 goto err_debugfs;
214
215 if (def_disp_name)
216 core.default_display_name = def_disp_name;
217 else if (pdata->default_display_name)
218 core.default_display_name = pdata->default_display_name;
219 else if (pdata->default_device)
220 core.default_display_name = pdata->default_device->name;
221
222 register_pm_notifier(&omap_dss_pm_notif_block);
223
224 return 0;
225
226 err_debugfs:
227
228 return r;
229 }
230
omap_dss_remove(struct platform_device * pdev)231 static int omap_dss_remove(struct platform_device *pdev)
232 {
233 unregister_pm_notifier(&omap_dss_pm_notif_block);
234
235 dss_uninitialize_debugfs();
236
237 return 0;
238 }
239
omap_dss_shutdown(struct platform_device * pdev)240 static void omap_dss_shutdown(struct platform_device *pdev)
241 {
242 DSSDBG("shutdown\n");
243 dss_disable_all_devices();
244 }
245
246 static struct platform_driver omap_dss_driver = {
247 .remove = omap_dss_remove,
248 .shutdown = omap_dss_shutdown,
249 .driver = {
250 .name = "omapdss",
251 },
252 };
253
254 /* INIT */
255 static int (*dss_output_drv_reg_funcs[])(void) __initdata = {
256 #ifdef CONFIG_OMAP2_DSS_DSI
257 dsi_init_platform_driver,
258 #endif
259 #ifdef CONFIG_OMAP2_DSS_DPI
260 dpi_init_platform_driver,
261 #endif
262 #ifdef CONFIG_OMAP2_DSS_SDI
263 sdi_init_platform_driver,
264 #endif
265 #ifdef CONFIG_OMAP2_DSS_RFBI
266 rfbi_init_platform_driver,
267 #endif
268 #ifdef CONFIG_OMAP2_DSS_VENC
269 venc_init_platform_driver,
270 #endif
271 #ifdef CONFIG_OMAP4_DSS_HDMI
272 hdmi4_init_platform_driver,
273 #endif
274 #ifdef CONFIG_OMAP5_DSS_HDMI
275 hdmi5_init_platform_driver,
276 #endif
277 };
278
279 static void (*dss_output_drv_unreg_funcs[])(void) __exitdata = {
280 #ifdef CONFIG_OMAP2_DSS_DSI
281 dsi_uninit_platform_driver,
282 #endif
283 #ifdef CONFIG_OMAP2_DSS_DPI
284 dpi_uninit_platform_driver,
285 #endif
286 #ifdef CONFIG_OMAP2_DSS_SDI
287 sdi_uninit_platform_driver,
288 #endif
289 #ifdef CONFIG_OMAP2_DSS_RFBI
290 rfbi_uninit_platform_driver,
291 #endif
292 #ifdef CONFIG_OMAP2_DSS_VENC
293 venc_uninit_platform_driver,
294 #endif
295 #ifdef CONFIG_OMAP4_DSS_HDMI
296 hdmi4_uninit_platform_driver,
297 #endif
298 #ifdef CONFIG_OMAP5_DSS_HDMI
299 hdmi5_uninit_platform_driver,
300 #endif
301 };
302
303 static bool dss_output_drv_loaded[ARRAY_SIZE(dss_output_drv_reg_funcs)];
304
omap_dss_init(void)305 static int __init omap_dss_init(void)
306 {
307 int r;
308 int i;
309
310 r = platform_driver_probe(&omap_dss_driver, omap_dss_probe);
311 if (r)
312 return r;
313
314 r = dss_init_platform_driver();
315 if (r) {
316 DSSERR("Failed to initialize DSS platform driver\n");
317 goto err_dss;
318 }
319
320 r = dispc_init_platform_driver();
321 if (r) {
322 DSSERR("Failed to initialize dispc platform driver\n");
323 goto err_dispc;
324 }
325
326 /*
327 * It's ok if the output-driver register fails. It happens, for example,
328 * when there is no output-device (e.g. SDI for OMAP4).
329 */
330 for (i = 0; i < ARRAY_SIZE(dss_output_drv_reg_funcs); ++i) {
331 r = dss_output_drv_reg_funcs[i]();
332 if (r == 0)
333 dss_output_drv_loaded[i] = true;
334 }
335
336 dss_initialized = true;
337
338 return 0;
339
340 err_dispc:
341 dss_uninit_platform_driver();
342 err_dss:
343 platform_driver_unregister(&omap_dss_driver);
344
345 return r;
346 }
347
omap_dss_exit(void)348 static void __exit omap_dss_exit(void)
349 {
350 int i;
351
352 for (i = 0; i < ARRAY_SIZE(dss_output_drv_unreg_funcs); ++i) {
353 if (dss_output_drv_loaded[i])
354 dss_output_drv_unreg_funcs[i]();
355 }
356
357 dispc_uninit_platform_driver();
358 dss_uninit_platform_driver();
359
360 platform_driver_unregister(&omap_dss_driver);
361 }
362
363 module_init(omap_dss_init);
364 module_exit(omap_dss_exit);
365
366 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@nokia.com>");
367 MODULE_DESCRIPTION("OMAP2/3 Display Subsystem");
368 MODULE_LICENSE("GPL v2");
369
370