kernel/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
  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 const char *omapdss_get_default_display_name(void)
  54 {
  55         return core.default_display_name;
  56 }
  57 EXPORT_SYMBOL(omapdss_get_default_display_name);
  58
  59 enum omapdss_version omapdss_get_version(void)
  60 {
  61         struct omap_dss_board_info *pdata = core.pdev->dev.platform_data;
  62         return pdata->version;
  63 }
  64 EXPORT_SYMBOL(omapdss_get_version);
  65
  66 struct platform_device *dss_get_core_pdev(void)
  67 {
  68         return core.pdev;
  69 }
  70
  71 int dss_dsi_enable_pads(int dsi_id, unsigned lane_mask)
  72 {
  73         struct omap_dss_board_info *board_data = core.pdev->dev.platform_data;
  74
  75         if (!board_data->dsi_enable_pads)
  76                 return -ENOENT;
  77
  78         return board_data->dsi_enable_pads(dsi_id, lane_mask);
  79 }
  80
  81 void dss_dsi_disable_pads(int dsi_id, unsigned lane_mask)
  82 {
  83         struct omap_dss_board_info *board_data = core.pdev->dev.platform_data;
  84
  85         if (!board_data->dsi_disable_pads)
  86                 return;
  87
  88         return board_data->dsi_disable_pads(dsi_id, lane_mask);
  89 }
  90
  91 int dss_set_min_bus_tput(struct device *dev, unsigned long tput)
  92 {
  93         struct omap_dss_board_info *pdata = core.pdev->dev.platform_data;
  94
  95         if (pdata->set_min_bus_tput)
  96                 return pdata->set_min_bus_tput(dev, tput);
  97         else
  98                 return 0;
  99 }
 100
 101 #if defined(CONFIG_OMAP2_DSS_DEBUGFS)
 102 static int dss_debug_show(struct seq_file *s, void *unused)
 103 {
 104         void (*func)(struct seq_file *) = s->private;
 105         func(s);
 106         return 0;
 107 }
 108
 109 static int dss_debug_open(struct inode *inode, struct file *file)
 110 {
 111         return single_open(file, dss_debug_show, inode->i_private);
 112 }
 113
 114 static const struct file_operations dss_debug_fops = {
 115         .open           = dss_debug_open,
 116         .read           = seq_read,
 117         .llseek         = seq_lseek,
 118         .release        = single_release,
 119 };
 120
 121 static struct dentry *dss_debugfs_dir;
 122
 123 static int dss_initialize_debugfs(void)
 124 {
 125         dss_debugfs_dir = debugfs_create_dir("omapdss", NULL);
 126         if (IS_ERR(dss_debugfs_dir)) {
 127                 int err = PTR_ERR(dss_debugfs_dir);
 128                 dss_debugfs_dir = NULL;
 129                 return err;
 130         }
 131
 132         debugfs_create_file("clk", S_IRUGO, dss_debugfs_dir,
 133                         &dss_debug_dump_clocks, &dss_debug_fops);
 134
 135         return 0;
 136 }
 137
 138 static void dss_uninitialize_debugfs(void)
 139 {
 140         if (dss_debugfs_dir)
 141                 debugfs_remove_recursive(dss_debugfs_dir);
 142 }
 143
 144 int dss_debugfs_create_file(const char *name, void (*write)(struct seq_file *))
 145 {
 146         struct dentry *d;
 147
 148         d = debugfs_create_file(name, S_IRUGO, dss_debugfs_dir,
 149                         write, &dss_debug_fops);
 150
 151         return PTR_ERR_OR_ZERO(d);
 152 }
 153 #else /* CONFIG_OMAP2_DSS_DEBUGFS */
 154 static inline int dss_initialize_debugfs(void)
 155 {
 156         return 0;
 157 }
 158 static inline void dss_uninitialize_debugfs(void)
 159 {
 160 }
 161 int dss_debugfs_create_file(const char *name, void (*write)(struct seq_file *))
 162 {
 163         return 0;
 164 }
 165 #endif /* CONFIG_OMAP2_DSS_DEBUGFS */
 166
 167 /* PLATFORM DEVICE */
 168 static int omap_dss_pm_notif(struct notifier_block *b, unsigned long v, void *d)
 169 {
 170         DSSDBG("pm notif %lu\n", v);
 171
 172         switch (v) {
 173         case PM_SUSPEND_PREPARE:
 174         case PM_HIBERNATION_PREPARE:
 175         case PM_RESTORE_PREPARE:
 176                 DSSDBG("suspending displays\n");
 177                 return dss_suspend_all_devices();
 178
 179         case PM_POST_SUSPEND:
 180         case PM_POST_HIBERNATION:
 181         case PM_POST_RESTORE:
 182                 DSSDBG("resuming displays\n");
 183                 return dss_resume_all_devices();
 184
 185         default:
 186                 return 0;
 187         }
 188 }
 189
 190 static struct notifier_block omap_dss_pm_notif_block = {
 191         .notifier_call = omap_dss_pm_notif,
 192 };
 193
 194 static int __init omap_dss_probe(struct platform_device *pdev)
 195 {
 196         struct omap_dss_board_info *pdata = pdev->dev.platform_data;
 197         int r;
 198
 199         core.pdev = pdev;
 200
 201         dss_features_init(omapdss_get_version());
 202
 203         r = dss_initialize_debugfs();
 204         if (r)
 205                 goto err_debugfs;
 206
 207         if (def_disp_name)
 208                 core.default_display_name = def_disp_name;
 209         else if (pdata->default_display_name)
 210                 core.default_display_name = pdata->default_display_name;
 211         else if (pdata->default_device)
 212                 core.default_display_name = pdata->default_device->name;
 213
 214         register_pm_notifier(&omap_dss_pm_notif_block);
 215
 216         return 0;
 217
 218 err_debugfs:
 219
 220         return r;
 221 }
 222
 223 static int omap_dss_remove(struct platform_device *pdev)
 224 {
 225         unregister_pm_notifier(&omap_dss_pm_notif_block);
 226
 227         dss_uninitialize_debugfs();
 228
 229         return 0;
 230 }
 231
 232 static void omap_dss_shutdown(struct platform_device *pdev)
 233 {
 234         DSSDBG("shutdown\n");
 235         dss_disable_all_devices();
 236 }
 237
 238 static struct platform_driver omap_dss_driver = {
 239         .remove         = omap_dss_remove,
 240         .shutdown       = omap_dss_shutdown,
 241         .driver         = {
 242                 .name   = "omapdss",
 243         },
 244 };
 245
 246 /* INIT */
 247 static int (*dss_output_drv_reg_funcs[])(void) __initdata = {
 248         dss_init_platform_driver,
 249         dispc_init_platform_driver,
 250 #ifdef CONFIG_OMAP2_DSS_DSI
 251         dsi_init_platform_driver,
 252 #endif
 253 #ifdef CONFIG_OMAP2_DSS_DPI
 254         dpi_init_platform_driver,
 255 #endif
 256 #ifdef CONFIG_OMAP2_DSS_SDI
 257         sdi_init_platform_driver,
 258 #endif
 259 #ifdef CONFIG_OMAP2_DSS_RFBI
 260         rfbi_init_platform_driver,
 261 #endif
 262 #ifdef CONFIG_OMAP2_DSS_VENC
 263         venc_init_platform_driver,
 264 #endif
 265 #ifdef CONFIG_OMAP4_DSS_HDMI
 266         hdmi4_init_platform_driver,
 267 #endif
 268 #ifdef CONFIG_OMAP5_DSS_HDMI
 269         hdmi5_init_platform_driver,
 270 #endif
 271 };
 272
 273 static void (*dss_output_drv_unreg_funcs[])(void) = {
 274 #ifdef CONFIG_OMAP5_DSS_HDMI
 275         hdmi5_uninit_platform_driver,
 276 #endif
 277 #ifdef CONFIG_OMAP4_DSS_HDMI
 278         hdmi4_uninit_platform_driver,
 279 #endif
 280 #ifdef CONFIG_OMAP2_DSS_VENC
 281         venc_uninit_platform_driver,
 282 #endif
 283 #ifdef CONFIG_OMAP2_DSS_RFBI
 284         rfbi_uninit_platform_driver,
 285 #endif
 286 #ifdef CONFIG_OMAP2_DSS_SDI
 287         sdi_uninit_platform_driver,
 288 #endif
 289 #ifdef CONFIG_OMAP2_DSS_DPI
 290         dpi_uninit_platform_driver,
 291 #endif
 292 #ifdef CONFIG_OMAP2_DSS_DSI
 293         dsi_uninit_platform_driver,
 294 #endif
 295         dispc_uninit_platform_driver,
 296         dss_uninit_platform_driver,
 297 };
 298
 299 static int __init omap_dss_init(void)
 300 {
 301         int r;
 302         int i;
 303
 304         r = platform_driver_probe(&omap_dss_driver, omap_dss_probe);
 305         if (r)
 306                 return r;
 307
 308         for (i = 0; i < ARRAY_SIZE(dss_output_drv_reg_funcs); ++i) {
 309                 r = dss_output_drv_reg_funcs[i]();
 310                 if (r)
 311                         goto err_reg;
 312         }
 313
 314         return 0;
 315
 316 err_reg:
 317         for (i = ARRAY_SIZE(dss_output_drv_reg_funcs) - i;
 318                         i < ARRAY_SIZE(dss_output_drv_reg_funcs);
 319                         ++i)
 320                 dss_output_drv_unreg_funcs[i]();
 321
 322         platform_driver_unregister(&omap_dss_driver);
 323
 324         return r;
 325 }
 326
 327 static void __exit omap_dss_exit(void)
 328 {
 329         int i;
 330
 331         for (i = 0; i < ARRAY_SIZE(dss_output_drv_unreg_funcs); ++i)
 332                 dss_output_drv_unreg_funcs[i]();
 333
 334         platform_driver_unregister(&omap_dss_driver);
 335 }
 336
 337 module_init(omap_dss_init);
 338 module_exit(omap_dss_exit);
 339
 340 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@nokia.com>");
 341 MODULE_DESCRIPTION("OMAP2/3 Display Subsystem");
 342 MODULE_LICENSE("GPL v2");
 343