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 DSSDBG("suspending displays\n");
183 return dss_suspend_all_devices();
184
185 case PM_POST_SUSPEND:
186 DSSDBG("resuming displays\n");
187 return dss_resume_all_devices();
188
189 default:
190 return 0;
191 }
192 }
193
194 static struct notifier_block omap_dss_pm_notif_block = {
195 .notifier_call = omap_dss_pm_notif,
196 };
197
omap_dss_probe(struct platform_device * pdev)198 static int __init omap_dss_probe(struct platform_device *pdev)
199 {
200 struct omap_dss_board_info *pdata = pdev->dev.platform_data;
201 int r;
202
203 core.pdev = pdev;
204
205 dss_features_init(omapdss_get_version());
206
207 r = dss_initialize_debugfs();
208 if (r)
209 goto err_debugfs;
210
211 if (def_disp_name)
212 core.default_display_name = def_disp_name;
213 else if (pdata->default_display_name)
214 core.default_display_name = pdata->default_display_name;
215 else if (pdata->default_device)
216 core.default_display_name = pdata->default_device->name;
217
218 register_pm_notifier(&omap_dss_pm_notif_block);
219
220 return 0;
221
222 err_debugfs:
223
224 return r;
225 }
226
omap_dss_remove(struct platform_device * pdev)227 static int omap_dss_remove(struct platform_device *pdev)
228 {
229 unregister_pm_notifier(&omap_dss_pm_notif_block);
230
231 dss_uninitialize_debugfs();
232
233 return 0;
234 }
235
omap_dss_shutdown(struct platform_device * pdev)236 static void omap_dss_shutdown(struct platform_device *pdev)
237 {
238 DSSDBG("shutdown\n");
239 dss_disable_all_devices();
240 }
241
242 static struct platform_driver omap_dss_driver = {
243 .remove = omap_dss_remove,
244 .shutdown = omap_dss_shutdown,
245 .driver = {
246 .name = "omapdss",
247 .owner = THIS_MODULE,
248 },
249 };
250
251 /* INIT */
252 static int (*dss_output_drv_reg_funcs[])(void) __initdata = {
253 #ifdef CONFIG_OMAP2_DSS_DSI
254 dsi_init_platform_driver,
255 #endif
256 #ifdef CONFIG_OMAP2_DSS_DPI
257 dpi_init_platform_driver,
258 #endif
259 #ifdef CONFIG_OMAP2_DSS_SDI
260 sdi_init_platform_driver,
261 #endif
262 #ifdef CONFIG_OMAP2_DSS_RFBI
263 rfbi_init_platform_driver,
264 #endif
265 #ifdef CONFIG_OMAP2_DSS_VENC
266 venc_init_platform_driver,
267 #endif
268 #ifdef CONFIG_OMAP4_DSS_HDMI
269 hdmi4_init_platform_driver,
270 #endif
271 #ifdef CONFIG_OMAP5_DSS_HDMI
272 hdmi5_init_platform_driver,
273 #endif
274 };
275
276 static void (*dss_output_drv_unreg_funcs[])(void) __exitdata = {
277 #ifdef CONFIG_OMAP2_DSS_DSI
278 dsi_uninit_platform_driver,
279 #endif
280 #ifdef CONFIG_OMAP2_DSS_DPI
281 dpi_uninit_platform_driver,
282 #endif
283 #ifdef CONFIG_OMAP2_DSS_SDI
284 sdi_uninit_platform_driver,
285 #endif
286 #ifdef CONFIG_OMAP2_DSS_RFBI
287 rfbi_uninit_platform_driver,
288 #endif
289 #ifdef CONFIG_OMAP2_DSS_VENC
290 venc_uninit_platform_driver,
291 #endif
292 #ifdef CONFIG_OMAP4_DSS_HDMI
293 hdmi4_uninit_platform_driver,
294 #endif
295 #ifdef CONFIG_OMAP5_DSS_HDMI
296 hdmi5_uninit_platform_driver,
297 #endif
298 };
299
300 static bool dss_output_drv_loaded[ARRAY_SIZE(dss_output_drv_reg_funcs)];
301
omap_dss_init(void)302 static int __init omap_dss_init(void)
303 {
304 int r;
305 int i;
306
307 r = platform_driver_probe(&omap_dss_driver, omap_dss_probe);
308 if (r)
309 return r;
310
311 r = dss_init_platform_driver();
312 if (r) {
313 DSSERR("Failed to initialize DSS platform driver\n");
314 goto err_dss;
315 }
316
317 r = dispc_init_platform_driver();
318 if (r) {
319 DSSERR("Failed to initialize dispc platform driver\n");
320 goto err_dispc;
321 }
322
323 /*
324 * It's ok if the output-driver register fails. It happens, for example,
325 * when there is no output-device (e.g. SDI for OMAP4).
326 */
327 for (i = 0; i < ARRAY_SIZE(dss_output_drv_reg_funcs); ++i) {
328 r = dss_output_drv_reg_funcs[i]();
329 if (r == 0)
330 dss_output_drv_loaded[i] = true;
331 }
332
333 dss_initialized = true;
334
335 return 0;
336
337 err_dispc:
338 dss_uninit_platform_driver();
339 err_dss:
340 platform_driver_unregister(&omap_dss_driver);
341
342 return r;
343 }
344
omap_dss_exit(void)345 static void __exit omap_dss_exit(void)
346 {
347 int i;
348
349 for (i = 0; i < ARRAY_SIZE(dss_output_drv_unreg_funcs); ++i) {
350 if (dss_output_drv_loaded[i])
351 dss_output_drv_unreg_funcs[i]();
352 }
353
354 dispc_uninit_platform_driver();
355 dss_uninit_platform_driver();
356
357 platform_driver_unregister(&omap_dss_driver);
358 }
359
360 module_init(omap_dss_init);
361 module_exit(omap_dss_exit);
362
363 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@nokia.com>");
364 MODULE_DESCRIPTION("OMAP2/3 Display Subsystem");
365 MODULE_LICENSE("GPL v2");
366
367