2 * linux/drivers/video/omap2/dss/core.c
4 * Copyright (C) 2009 Nokia Corporation
5 * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
7 * Some code and ideas taken from drivers/video/omap/ driver
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.
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
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/>.
23 #define DSS_SUBSYS_NAME "CORE"
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>
33 #include <linux/device.h>
34 #include <linux/regulator/consumer.h>
36 #include <plat/display.h>
39 #include "dss_features.h"
42 struct platform_device *pdev;
44 struct regulator *vdds_dsi_reg;
45 struct regulator *vdds_sdi_reg;
48 static char *def_disp_name;
49 module_param_named(def_disp, def_disp_name, charp, 0);
50 MODULE_PARM_DESC(def_disp, "default display name");
53 unsigned int dss_debug;
54 module_param_named(debug, dss_debug, bool, 0644);
59 struct regulator *dss_get_vdds_dsi(void)
61 struct regulator *reg;
63 if (core.vdds_dsi_reg != NULL)
64 return core.vdds_dsi_reg;
66 reg = regulator_get(&core.pdev->dev, "vdds_dsi");
68 core.vdds_dsi_reg = reg;
73 struct regulator *dss_get_vdds_sdi(void)
75 struct regulator *reg;
77 if (core.vdds_sdi_reg != NULL)
78 return core.vdds_sdi_reg;
80 reg = regulator_get(&core.pdev->dev, "vdds_sdi");
82 core.vdds_sdi_reg = reg;
87 #if defined(CONFIG_DEBUG_FS) && defined(CONFIG_OMAP2_DSS_DEBUG_SUPPORT)
88 static int dss_debug_show(struct seq_file *s, void *unused)
90 void (*func)(struct seq_file *) = s->private;
95 static int dss_debug_open(struct inode *inode, struct file *file)
97 return single_open(file, dss_debug_show, inode->i_private);
100 static const struct file_operations dss_debug_fops = {
101 .open = dss_debug_open,
104 .release = single_release,
107 static struct dentry *dss_debugfs_dir;
109 static int dss_initialize_debugfs(void)
111 dss_debugfs_dir = debugfs_create_dir("omapdss", NULL);
112 if (IS_ERR(dss_debugfs_dir)) {
113 int err = PTR_ERR(dss_debugfs_dir);
114 dss_debugfs_dir = NULL;
118 debugfs_create_file("clk", S_IRUGO, dss_debugfs_dir,
119 &dss_debug_dump_clocks, &dss_debug_fops);
121 #ifdef CONFIG_OMAP2_DSS_COLLECT_IRQ_STATS
122 debugfs_create_file("dispc_irq", S_IRUGO, dss_debugfs_dir,
123 &dispc_dump_irqs, &dss_debug_fops);
126 #if defined(CONFIG_OMAP2_DSS_DSI) && defined(CONFIG_OMAP2_DSS_COLLECT_IRQ_STATS)
127 debugfs_create_file("dsi_irq", S_IRUGO, dss_debugfs_dir,
128 &dsi_dump_irqs, &dss_debug_fops);
131 debugfs_create_file("dss", S_IRUGO, dss_debugfs_dir,
132 &dss_dump_regs, &dss_debug_fops);
133 debugfs_create_file("dispc", S_IRUGO, dss_debugfs_dir,
134 &dispc_dump_regs, &dss_debug_fops);
135 #ifdef CONFIG_OMAP2_DSS_RFBI
136 debugfs_create_file("rfbi", S_IRUGO, dss_debugfs_dir,
137 &rfbi_dump_regs, &dss_debug_fops);
139 #ifdef CONFIG_OMAP2_DSS_DSI
140 debugfs_create_file("dsi", S_IRUGO, dss_debugfs_dir,
141 &dsi_dump_regs, &dss_debug_fops);
143 #ifdef CONFIG_OMAP2_DSS_VENC
144 debugfs_create_file("venc", S_IRUGO, dss_debugfs_dir,
145 &venc_dump_regs, &dss_debug_fops);
150 static void dss_uninitialize_debugfs(void)
153 debugfs_remove_recursive(dss_debugfs_dir);
155 #else /* CONFIG_DEBUG_FS && CONFIG_OMAP2_DSS_DEBUG_SUPPORT */
156 static inline int dss_initialize_debugfs(void)
160 static inline void dss_uninitialize_debugfs(void)
163 #endif /* CONFIG_DEBUG_FS && CONFIG_OMAP2_DSS_DEBUG_SUPPORT */
165 /* PLATFORM DEVICE */
166 static int omap_dss_probe(struct platform_device *pdev)
168 struct omap_dss_board_info *pdata = pdev->dev.platform_data;
176 dss_init_overlay_managers(pdev);
177 dss_init_overlays(pdev);
179 r = dss_init_platform_driver();
181 DSSERR("Failed to initialize DSS platform driver\n");
185 /* keep clocks enabled to prevent context saves/restores during init */
186 dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK);
188 r = rfbi_init_platform_driver();
190 DSSERR("Failed to initialize rfbi platform driver\n");
194 r = dispc_init_platform_driver();
196 DSSERR("Failed to initialize dispc platform driver\n");
200 r = venc_init_platform_driver();
202 DSSERR("Failed to initialize venc platform driver\n");
206 r = dsi_init_platform_driver();
208 DSSERR("Failed to initialize DSI platform driver\n");
212 r = hdmi_init_platform_driver();
214 DSSERR("Failed to initialize hdmi\n");
218 r = dss_initialize_debugfs();
222 for (i = 0; i < pdata->num_devices; ++i) {
223 struct omap_dss_device *dssdev = pdata->devices[i];
225 r = omap_dss_register_device(dssdev);
227 DSSERR("device %d %s register failed %d\n", i,
228 dssdev->name ?: "unnamed", r);
231 omap_dss_unregister_device(pdata->devices[i]);
236 if (def_disp_name && strcmp(def_disp_name, dssdev->name) == 0)
237 pdata->default_device = dssdev;
240 dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK);
245 dss_uninitialize_debugfs();
247 hdmi_uninit_platform_driver();
249 dsi_uninit_platform_driver();
251 venc_uninit_platform_driver();
253 dispc_uninit_platform_driver();
255 rfbi_uninit_platform_driver();
257 dss_uninit_platform_driver();
263 static int omap_dss_remove(struct platform_device *pdev)
265 struct omap_dss_board_info *pdata = pdev->dev.platform_data;
268 dss_uninitialize_debugfs();
270 venc_uninit_platform_driver();
271 dispc_uninit_platform_driver();
272 rfbi_uninit_platform_driver();
273 dsi_uninit_platform_driver();
274 hdmi_uninit_platform_driver();
275 dss_uninit_platform_driver();
277 dss_uninit_overlays(pdev);
278 dss_uninit_overlay_managers(pdev);
280 for (i = 0; i < pdata->num_devices; ++i)
281 omap_dss_unregister_device(pdata->devices[i]);
286 static void omap_dss_shutdown(struct platform_device *pdev)
288 DSSDBG("shutdown\n");
289 dss_disable_all_devices();
292 static int omap_dss_suspend(struct platform_device *pdev, pm_message_t state)
294 DSSDBG("suspend %d\n", state.event);
296 return dss_suspend_all_devices();
299 static int omap_dss_resume(struct platform_device *pdev)
303 return dss_resume_all_devices();
306 static struct platform_driver omap_dss_driver = {
307 .probe = omap_dss_probe,
308 .remove = omap_dss_remove,
309 .shutdown = omap_dss_shutdown,
310 .suspend = omap_dss_suspend,
311 .resume = omap_dss_resume,
314 .owner = THIS_MODULE,
319 static int dss_bus_match(struct device *dev, struct device_driver *driver)
321 struct omap_dss_device *dssdev = to_dss_device(dev);
323 DSSDBG("bus_match. dev %s/%s, drv %s\n",
324 dev_name(dev), dssdev->driver_name, driver->name);
326 return strcmp(dssdev->driver_name, driver->name) == 0;
329 static ssize_t device_name_show(struct device *dev,
330 struct device_attribute *attr, char *buf)
332 struct omap_dss_device *dssdev = to_dss_device(dev);
333 return snprintf(buf, PAGE_SIZE, "%s\n",
338 static struct device_attribute default_dev_attrs[] = {
339 __ATTR(name, S_IRUGO, device_name_show, NULL),
343 static ssize_t driver_name_show(struct device_driver *drv, char *buf)
345 struct omap_dss_driver *dssdrv = to_dss_driver(drv);
346 return snprintf(buf, PAGE_SIZE, "%s\n",
347 dssdrv->driver.name ?
348 dssdrv->driver.name : "");
350 static struct driver_attribute default_drv_attrs[] = {
351 __ATTR(name, S_IRUGO, driver_name_show, NULL),
355 static struct bus_type dss_bus_type = {
357 .match = dss_bus_match,
358 .dev_attrs = default_dev_attrs,
359 .drv_attrs = default_drv_attrs,
362 static void dss_bus_release(struct device *dev)
364 DSSDBG("bus_release\n");
367 static struct device dss_bus = {
368 .release = dss_bus_release,
371 struct bus_type *dss_get_bus(void)
373 return &dss_bus_type;
377 static int dss_driver_probe(struct device *dev)
380 struct omap_dss_driver *dssdrv = to_dss_driver(dev->driver);
381 struct omap_dss_device *dssdev = to_dss_device(dev);
382 struct omap_dss_board_info *pdata = core.pdev->dev.platform_data;
385 DSSDBG("driver_probe: dev %s/%s, drv %s\n",
386 dev_name(dev), dssdev->driver_name,
387 dssdrv->driver.name);
389 dss_init_device(core.pdev, dssdev);
391 force = pdata->default_device == dssdev;
392 dss_recheck_connections(dssdev, force);
394 r = dssdrv->probe(dssdev);
397 DSSERR("driver probe failed: %d\n", r);
398 dss_uninit_device(core.pdev, dssdev);
402 DSSDBG("probe done for device %s\n", dev_name(dev));
404 dssdev->driver = dssdrv;
409 static int dss_driver_remove(struct device *dev)
411 struct omap_dss_driver *dssdrv = to_dss_driver(dev->driver);
412 struct omap_dss_device *dssdev = to_dss_device(dev);
414 DSSDBG("driver_remove: dev %s/%s\n", dev_name(dev),
415 dssdev->driver_name);
417 dssdrv->remove(dssdev);
419 dss_uninit_device(core.pdev, dssdev);
421 dssdev->driver = NULL;
426 int omap_dss_register_driver(struct omap_dss_driver *dssdriver)
428 dssdriver->driver.bus = &dss_bus_type;
429 dssdriver->driver.probe = dss_driver_probe;
430 dssdriver->driver.remove = dss_driver_remove;
432 if (dssdriver->get_resolution == NULL)
433 dssdriver->get_resolution = omapdss_default_get_resolution;
434 if (dssdriver->get_recommended_bpp == NULL)
435 dssdriver->get_recommended_bpp =
436 omapdss_default_get_recommended_bpp;
438 return driver_register(&dssdriver->driver);
440 EXPORT_SYMBOL(omap_dss_register_driver);
442 void omap_dss_unregister_driver(struct omap_dss_driver *dssdriver)
444 driver_unregister(&dssdriver->driver);
446 EXPORT_SYMBOL(omap_dss_unregister_driver);
449 static void reset_device(struct device *dev, int check)
451 u8 *dev_p = (u8 *)dev;
452 u8 *dev_end = dev_p + sizeof(*dev);
455 saved_pdata = dev->platform_data;
458 * Check if there is any other setting than platform_data
459 * in struct device; warn that these will be reset by our
462 dev->platform_data = NULL;
463 while (dev_p < dev_end) {
465 WARN("%s: struct device fields will be "
473 memset(dev, 0, sizeof(*dev));
474 dev->platform_data = saved_pdata;
478 static void omap_dss_dev_release(struct device *dev)
480 reset_device(dev, 0);
483 int omap_dss_register_device(struct omap_dss_device *dssdev)
487 WARN_ON(!dssdev->driver_name);
489 reset_device(&dssdev->dev, 1);
490 dssdev->dev.bus = &dss_bus_type;
491 dssdev->dev.parent = &dss_bus;
492 dssdev->dev.release = omap_dss_dev_release;
493 dev_set_name(&dssdev->dev, "display%d", dev_num++);
494 return device_register(&dssdev->dev);
497 void omap_dss_unregister_device(struct omap_dss_device *dssdev)
499 device_unregister(&dssdev->dev);
503 static int omap_dss_bus_register(void)
507 r = bus_register(&dss_bus_type);
509 DSSERR("bus register failed\n");
513 dev_set_name(&dss_bus, "omapdss");
514 r = device_register(&dss_bus);
516 DSSERR("bus driver register failed\n");
517 bus_unregister(&dss_bus_type);
526 #ifdef CONFIG_OMAP2_DSS_MODULE
527 static void omap_dss_bus_unregister(void)
529 device_unregister(&dss_bus);
531 bus_unregister(&dss_bus_type);
534 static int __init omap_dss_init(void)
538 r = omap_dss_bus_register();
542 r = platform_driver_register(&omap_dss_driver);
544 omap_dss_bus_unregister();
551 static void __exit omap_dss_exit(void)
553 if (core.vdds_dsi_reg != NULL) {
554 regulator_put(core.vdds_dsi_reg);
555 core.vdds_dsi_reg = NULL;
558 if (core.vdds_sdi_reg != NULL) {
559 regulator_put(core.vdds_sdi_reg);
560 core.vdds_sdi_reg = NULL;
563 platform_driver_unregister(&omap_dss_driver);
565 omap_dss_bus_unregister();
568 module_init(omap_dss_init);
569 module_exit(omap_dss_exit);
571 static int __init omap_dss_init(void)
573 return omap_dss_bus_register();
576 static int __init omap_dss_init2(void)
578 return platform_driver_register(&omap_dss_driver);
581 core_initcall(omap_dss_init);
582 device_initcall(omap_dss_init2);
585 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@nokia.com>");
586 MODULE_DESCRIPTION("OMAP2/3 Display Subsystem");
587 MODULE_LICENSE("GPL v2");