drivers/video/fbdev/omap2/dss/core.c

   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 #include <linux/of.h>
  38
  39 #include <video/omapdss.h>
  40
  41 #include "dss.h"
  42 #include "dss_features.h"
  43
  44 static struct {
  45         struct platform_device *pdev;
  46
  47         const char *default_display_name;
  48 } core;
  49
  50 static uint g_display_skip_init;
  51 static uint g_display_share;
  52
  53 static char *def_disp_name;
  54 module_param_named(def_disp, def_disp_name, charp, 0);
  55 MODULE_PARM_DESC(def_disp, "default display name");
  56
  57 static bool dss_initialized;
  58
  59 const char *omapdss_get_default_display_name(void)
  60 {
  61         return core.default_display_name;
  62 }
  63 EXPORT_SYMBOL(omapdss_get_default_display_name);
  64
  65 enum omapdss_version omapdss_get_version(void)
  66 {
  67         struct omap_dss_board_info *pdata = core.pdev->dev.platform_data;
  68         return pdata->version;
  69 }
  70 EXPORT_SYMBOL(omapdss_get_version);
  71
  72 int omapdss_skipinit(void)
  73 {
  74         return g_display_skip_init;
  75 }
  76 EXPORT_SYMBOL(omapdss_skipinit);
  77
  78 int omapdss_display_share(void)
  79 {
  80         return g_display_share;
  81 }
  82 EXPORT_SYMBOL(omapdss_display_share);
  83
  84 bool omapdss_is_initialized(void)
  85 {
  86         return dss_initialized;
  87 }
  88 EXPORT_SYMBOL(omapdss_is_initialized);
  89
  90 struct platform_device *dss_get_core_pdev(void)
  91 {
  92         return core.pdev;
  93 }
  94
  95 int dss_dsi_enable_pads(int dsi_id, unsigned lane_mask)
  96 {
  97         struct omap_dss_board_info *board_data = core.pdev->dev.platform_data;
  98
  99         if (!board_data->dsi_enable_pads)
 100                 return -ENOENT;
 101
 102         return board_data->dsi_enable_pads(dsi_id, lane_mask);
 103 }
 104
 105 void dss_dsi_disable_pads(int dsi_id, unsigned lane_mask)
 106 {
 107         struct omap_dss_board_info *board_data = core.pdev->dev.platform_data;
 108
 109         if (!board_data->dsi_disable_pads)
 110                 return;
 111
 112         return board_data->dsi_disable_pads(dsi_id, lane_mask);
 113 }
 114
 115 int dss_set_min_bus_tput(struct device *dev, unsigned long tput)
 116 {
 117         struct omap_dss_board_info *pdata = core.pdev->dev.platform_data;
 118
 119         if (pdata->set_min_bus_tput)
 120                 return pdata->set_min_bus_tput(dev, tput);
 121         else
 122                 return 0;
 123 }
 124
 125 #if defined(CONFIG_OMAP2_DSS_DEBUGFS)
 126 static int dss_debug_show(struct seq_file *s, void *unused)
 127 {
 128         void (*func)(struct seq_file *) = s->private;
 129         func(s);
 130         return 0;
 131 }
 132
 133 static int dss_debug_open(struct inode *inode, struct file *file)
 134 {
 135         return single_open(file, dss_debug_show, inode->i_private);
 136 }
 137
 138 static const struct file_operations dss_debug_fops = {
 139         .open           = dss_debug_open,
 140         .read           = seq_read,
 141         .llseek         = seq_lseek,
 142         .release        = single_release,
 143 };
 144
 145 static struct dentry *dss_debugfs_dir;
 146
 147 static int dss_initialize_debugfs(void)
 148 {
 149         dss_debugfs_dir = debugfs_create_dir("omapdss", NULL);
 150         if (IS_ERR(dss_debugfs_dir)) {
 151                 int err = PTR_ERR(dss_debugfs_dir);
 152                 dss_debugfs_dir = NULL;
 153                 return err;
 154         }
 155
 156         debugfs_create_file("clk", S_IRUGO, dss_debugfs_dir,
 157                         &dss_debug_dump_clocks, &dss_debug_fops);
 158
 159         return 0;
 160 }
 161
 162 static void dss_uninitialize_debugfs(void)
 163 {
 164         if (dss_debugfs_dir)
 165                 debugfs_remove_recursive(dss_debugfs_dir);
 166 }
 167
 168 int dss_debugfs_create_file(const char *name, void (*write)(struct seq_file *))
 169 {
 170         struct dentry *d;
 171
 172         d = debugfs_create_file(name, S_IRUGO, dss_debugfs_dir,
 173                         write, &dss_debug_fops);
 174
 175         return PTR_ERR_OR_ZERO(d);
 176 }
 177 #else /* CONFIG_OMAP2_DSS_DEBUGFS */
 178 static inline int dss_initialize_debugfs(void)
 179 {
 180         return 0;
 181 }
 182 static inline void dss_uninitialize_debugfs(void)
 183 {
 184 }
 185 int dss_debugfs_create_file(const char *name, void (*write)(struct seq_file *))
 186 {
 187         return 0;
 188 }
 189 #endif /* CONFIG_OMAP2_DSS_DEBUGFS */
 190
 191 /* PLATFORM DEVICE */
 192 static int omap_dss_pm_notif(struct notifier_block *b, unsigned long v, void *d)
 193 {
 194         DSSDBG("pm notif %lu\n", v);
 195
 196         switch (v) {
 197         case PM_SUSPEND_PREPARE:
 198                 DSSDBG("suspending displays\n");
 199                 return dss_suspend_all_devices();
 200
 201         case PM_POST_SUSPEND:
 202                 DSSDBG("resuming displays\n");
 203                 return dss_resume_all_devices();
 204
 205         default:
 206                 return 0;
 207         }
 208 }
 209
 210 static struct notifier_block omap_dss_pm_notif_block = {
 211         .notifier_call = omap_dss_pm_notif,
 212 };
 213
 214 static int __init omap_dss_probe(struct platform_device *pdev)
 215 {
 216         struct omap_dss_board_info *pdata = pdev->dev.platform_data;
 217         struct device_node *node = pdev->dev.of_node;
 218         int r;
 219
 220         core.pdev = pdev;
 221
 222         of_property_read_u32(node, "skip_init",
 223                                          &g_display_skip_init);
 224         if (g_display_skip_init)
 225                 g_display_share = 1;
 226
 227         dss_features_init(omapdss_get_version());
 228
 229         r = dss_initialize_debugfs();
 230         if (r)
 231                 goto err_debugfs;
 232
 233         if (def_disp_name)
 234                 core.default_display_name = def_disp_name;
 235         else if (pdata->default_display_name)
 236                 core.default_display_name = pdata->default_display_name;
 237         else if (pdata->default_device)
 238                 core.default_display_name = pdata->default_device->name;
 239
 240         register_pm_notifier(&omap_dss_pm_notif_block);
 241
 242         return 0;
 243
 244 err_debugfs:
 245
 246         return r;
 247 }
 248
 249 static int omap_dss_remove(struct platform_device *pdev)
 250 {
 251         unregister_pm_notifier(&omap_dss_pm_notif_block);
 252
 253         dss_uninitialize_debugfs();
 254
 255         return 0;
 256 }
 257
 258 static void omap_dss_shutdown(struct platform_device *pdev)
 259 {
 260         DSSDBG("shutdown\n");
 261         dss_disable_all_devices();
 262 }
 263
 264 static struct platform_driver omap_dss_driver = {
 265         .remove         = omap_dss_remove,
 266         .shutdown       = omap_dss_shutdown,
 267         .driver         = {
 268                 .name   = "omapdss",
 269                 .owner  = THIS_MODULE,
 270         },
 271 };
 272
 273 /* INIT */
 274 static int (*dss_output_drv_reg_funcs[])(void) __initdata = {
 275 #ifdef CONFIG_OMAP2_DSS_DSI
 276         dsi_init_platform_driver,
 277 #endif
 278 #ifdef CONFIG_OMAP2_DSS_DPI
 279         dpi_init_platform_driver,
 280 #endif
 281 #ifdef CONFIG_OMAP2_DSS_SDI
 282         sdi_init_platform_driver,
 283 #endif
 284 #ifdef CONFIG_OMAP2_DSS_RFBI
 285         rfbi_init_platform_driver,
 286 #endif
 287 #ifdef CONFIG_OMAP2_DSS_VENC
 288         venc_init_platform_driver,
 289 #endif
 290 #ifdef CONFIG_OMAP4_DSS_HDMI
 291         hdmi4_init_platform_driver,
 292 #endif
 293 #ifdef CONFIG_OMAP5_DSS_HDMI
 294         hdmi5_init_platform_driver,
 295 #endif
 296 };
 297
 298 static void (*dss_output_drv_unreg_funcs[])(void) __exitdata = {
 299 #ifdef CONFIG_OMAP2_DSS_DSI
 300         dsi_uninit_platform_driver,
 301 #endif
 302 #ifdef CONFIG_OMAP2_DSS_DPI
 303         dpi_uninit_platform_driver,
 304 #endif
 305 #ifdef CONFIG_OMAP2_DSS_SDI
 306         sdi_uninit_platform_driver,
 307 #endif
 308 #ifdef CONFIG_OMAP2_DSS_RFBI
 309         rfbi_uninit_platform_driver,
 310 #endif
 311 #ifdef CONFIG_OMAP2_DSS_VENC
 312         venc_uninit_platform_driver,
 313 #endif
 314 #ifdef CONFIG_OMAP4_DSS_HDMI
 315         hdmi4_uninit_platform_driver,
 316 #endif
 317 #ifdef CONFIG_OMAP5_DSS_HDMI
 318         hdmi5_uninit_platform_driver,
 319 #endif
 320 };
 321
 322 static bool dss_output_drv_loaded[ARRAY_SIZE(dss_output_drv_reg_funcs)];
 323
 324 static int __init omap_dss_init(void)
 325 {
 326         int r;
 327         int i;
 328
 329         r = platform_driver_probe(&omap_dss_driver, omap_dss_probe);
 330         if (r)
 331                 return r;
 332
 333         r = dss_init_platform_driver();
 334         if (r) {
 335                 DSSERR("Failed to initialize DSS platform driver\n");
 336                 goto err_dss;
 337         }
 338
 339         r = dispc_init_platform_driver();
 340         if (r) {
 341                 DSSERR("Failed to initialize dispc platform driver\n");
 342                 goto err_dispc;
 343         }
 344
 345         /*
 346          * It's ok if the output-driver register fails. It happens, for example,
 347          * when there is no output-device (e.g. SDI for OMAP4).
 348          */
 349         for (i = 0; i < ARRAY_SIZE(dss_output_drv_reg_funcs); ++i) {
 350                 r = dss_output_drv_reg_funcs[i]();
 351                 if (r == 0)
 352                         dss_output_drv_loaded[i] = true;
 353         }
 354
 355         dss_initialized = true;
 356
 357         return 0;
 358
 359 err_dispc:
 360         dss_uninit_platform_driver();
 361 err_dss:
 362         platform_driver_unregister(&omap_dss_driver);
 363
 364         return r;
 365 }
 366
 367 static void __exit omap_dss_exit(void)
 368 {
 369         int i;
 370
 371         for (i = 0; i < ARRAY_SIZE(dss_output_drv_unreg_funcs); ++i) {
 372                 if (dss_output_drv_loaded[i])
 373                         dss_output_drv_unreg_funcs[i]();
 374         }
 375
 376         dispc_uninit_platform_driver();
 377         dss_uninit_platform_driver();
 378
 379         platform_driver_unregister(&omap_dss_driver);
 380 }
 381
 382 module_init(omap_dss_init);
 383 module_exit(omap_dss_exit);
 384
 385 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@nokia.com>");
 386 MODULE_DESCRIPTION("OMAP2/3 Display Subsystem");
 387 MODULE_LICENSE("GPL v2");
 388