Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17

Linux/drivers/gpu/drm/tilcdc/tilcdc_drv.c

  1 /*
  2  * Copyright (C) 2012 Texas Instruments
  3  * Author: Rob Clark <robdclark@gmail.com>
  4  *
  5  * This program is free software; you can redistribute it and/or modify it
  6  * under the terms of the GNU General Public License version 2 as published by
  7  * the Free Software Foundation.
  8  *
  9  * This program is distributed in the hope that it will be useful, but WITHOUT
 10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 12  * more details.
 13  *
 14  * You should have received a copy of the GNU General Public License along with
 15  * this program.  If not, see <http://www.gnu.org/licenses/>.
 16  */
 17 
 18 /* LCDC DRM driver, based on da8xx-fb */
 19 
 20 #include "tilcdc_drv.h"
 21 #include "tilcdc_regs.h"
 22 #include "tilcdc_tfp410.h"
 23 #include "tilcdc_slave.h"
 24 #include "tilcdc_panel.h"
 25 
 26 #include "drm_fb_helper.h"
 27 
 28 static LIST_HEAD(module_list);
 29 static bool slave_probing;
 30 
 31 void tilcdc_module_init(struct tilcdc_module *mod, const char *name,
 32                 const struct tilcdc_module_ops *funcs)
 33 {
 34         mod->name = name;
 35         mod->funcs = funcs;
 36         INIT_LIST_HEAD(&mod->list);
 37         list_add(&mod->list, &module_list);
 38 }
 39 
 40 void tilcdc_module_cleanup(struct tilcdc_module *mod)
 41 {
 42         list_del(&mod->list);
 43 }
 44 
 45 void tilcdc_slave_probedefer(bool defered)
 46 {
 47         slave_probing = defered;
 48 }
 49 
 50 static struct of_device_id tilcdc_of_match[];
 51 
 52 static struct drm_framebuffer *tilcdc_fb_create(struct drm_device *dev,
 53                 struct drm_file *file_priv, struct drm_mode_fb_cmd2 *mode_cmd)
 54 {
 55         return drm_fb_cma_create(dev, file_priv, mode_cmd);
 56 }
 57 
 58 static void tilcdc_fb_output_poll_changed(struct drm_device *dev)
 59 {
 60         struct tilcdc_drm_private *priv = dev->dev_private;
 61         if (priv->fbdev)
 62                 drm_fbdev_cma_hotplug_event(priv->fbdev);
 63 }
 64 
 65 static const struct drm_mode_config_funcs mode_config_funcs = {
 66         .fb_create = tilcdc_fb_create,
 67         .output_poll_changed = tilcdc_fb_output_poll_changed,
 68 };
 69 
 70 static int modeset_init(struct drm_device *dev)
 71 {
 72         struct tilcdc_drm_private *priv = dev->dev_private;
 73         struct tilcdc_module *mod;
 74 
 75         drm_mode_config_init(dev);
 76 
 77         priv->crtc = tilcdc_crtc_create(dev);
 78 
 79         list_for_each_entry(mod, &module_list, list) {
 80                 DBG("loading module: %s", mod->name);
 81                 mod->funcs->modeset_init(mod, dev);
 82         }
 83 
 84         if ((priv->num_encoders == 0) || (priv->num_connectors == 0)) {
 85                 /* oh nos! */
 86                 dev_err(dev->dev, "no encoders/connectors found\n");
 87                 return -ENXIO;
 88         }
 89 
 90         dev->mode_config.min_width = 0;
 91         dev->mode_config.min_height = 0;
 92         dev->mode_config.max_width = tilcdc_crtc_max_width(priv->crtc);
 93         dev->mode_config.max_height = 2048;
 94         dev->mode_config.funcs = &mode_config_funcs;
 95 
 96         return 0;
 97 }
 98 
 99 #ifdef CONFIG_CPU_FREQ
100 static int cpufreq_transition(struct notifier_block *nb,
101                                      unsigned long val, void *data)
102 {
103         struct tilcdc_drm_private *priv = container_of(nb,
104                         struct tilcdc_drm_private, freq_transition);
105         if (val == CPUFREQ_POSTCHANGE) {
106                 if (priv->lcd_fck_rate != clk_get_rate(priv->clk)) {
107                         priv->lcd_fck_rate = clk_get_rate(priv->clk);
108                         tilcdc_crtc_update_clk(priv->crtc);
109                 }
110         }
111 
112         return 0;
113 }
114 #endif
115 
116 /*
117  * DRM operations:
118  */
119 
120 static int tilcdc_unload(struct drm_device *dev)
121 {
122         struct tilcdc_drm_private *priv = dev->dev_private;
123 
124         drm_fbdev_cma_fini(priv->fbdev);
125         drm_kms_helper_poll_fini(dev);
126         drm_mode_config_cleanup(dev);
127         drm_vblank_cleanup(dev);
128 
129         pm_runtime_get_sync(dev->dev);
130         drm_irq_uninstall(dev);
131         pm_runtime_put_sync(dev->dev);
132 
133 #ifdef CONFIG_CPU_FREQ
134         cpufreq_unregister_notifier(&priv->freq_transition,
135                         CPUFREQ_TRANSITION_NOTIFIER);
136 #endif
137 
138         if (priv->clk)
139                 clk_put(priv->clk);
140 
141         if (priv->mmio)
142                 iounmap(priv->mmio);
143 
144         flush_workqueue(priv->wq);
145         destroy_workqueue(priv->wq);
146 
147         dev->dev_private = NULL;
148 
149         pm_runtime_disable(dev->dev);
150 
151         kfree(priv);
152 
153         return 0;
154 }
155 
156 static int tilcdc_load(struct drm_device *dev, unsigned long flags)
157 {
158         struct platform_device *pdev = dev->platformdev;
159         struct device_node *node = pdev->dev.of_node;
160         struct tilcdc_drm_private *priv;
161         struct tilcdc_module *mod;
162         struct resource *res;
163         u32 bpp = 0;
164         int ret;
165 
166         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
167         if (!priv) {
168                 dev_err(dev->dev, "failed to allocate private data\n");
169                 return -ENOMEM;
170         }
171 
172         dev->dev_private = priv;
173 
174         priv->wq = alloc_ordered_workqueue("tilcdc", 0);
175 
176         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
177         if (!res) {
178                 dev_err(dev->dev, "failed to get memory resource\n");
179                 ret = -EINVAL;
180                 goto fail;
181         }
182 
183         priv->mmio = ioremap_nocache(res->start, resource_size(res));
184         if (!priv->mmio) {
185                 dev_err(dev->dev, "failed to ioremap\n");
186                 ret = -ENOMEM;
187                 goto fail;
188         }
189 
190         priv->clk = clk_get(dev->dev, "fck");
191         if (IS_ERR(priv->clk)) {
192                 dev_err(dev->dev, "failed to get functional clock\n");
193                 ret = -ENODEV;
194                 goto fail;
195         }
196 
197         priv->disp_clk = clk_get(dev->dev, "dpll_disp_ck");
198         if (IS_ERR(priv->clk)) {
199                 dev_err(dev->dev, "failed to get display clock\n");
200                 ret = -ENODEV;
201                 goto fail;
202         }
203 
204 #ifdef CONFIG_CPU_FREQ
205         priv->lcd_fck_rate = clk_get_rate(priv->clk);
206         priv->freq_transition.notifier_call = cpufreq_transition;
207         ret = cpufreq_register_notifier(&priv->freq_transition,
208                         CPUFREQ_TRANSITION_NOTIFIER);
209         if (ret) {
210                 dev_err(dev->dev, "failed to register cpufreq notifier\n");
211                 goto fail;
212         }
213 #endif
214 
215         if (of_property_read_u32(node, "max-bandwidth", &priv->max_bandwidth))
216                 priv->max_bandwidth = TILCDC_DEFAULT_MAX_BANDWIDTH;
217 
218         DBG("Maximum Bandwidth Value %d", priv->max_bandwidth);
219 
220         if (of_property_read_u32(node, "ti,max-width", &priv->max_width))
221                 priv->max_width = TILCDC_DEFAULT_MAX_WIDTH;
222 
223         DBG("Maximum Horizontal Pixel Width Value %dpixels", priv->max_width);
224 
225         if (of_property_read_u32(node, "ti,max-pixelclock",
226                                         &priv->max_pixelclock))
227                 priv->max_pixelclock = TILCDC_DEFAULT_MAX_PIXELCLOCK;
228 
229         DBG("Maximum Pixel Clock Value %dKHz", priv->max_pixelclock);
230 
231         pm_runtime_enable(dev->dev);
232 
233         /* Determine LCD IP Version */
234         pm_runtime_get_sync(dev->dev);
235         switch (tilcdc_read(dev, LCDC_PID_REG)) {
236         case 0x4c100102:
237                 priv->rev = 1;
238                 break;
239         case 0x4f200800:
240         case 0x4f201000:
241                 priv->rev = 2;
242                 break;
243         default:
244                 dev_warn(dev->dev, "Unknown PID Reg value 0x%08x, "
245                                 "defaulting to LCD revision 1\n",
246                                 tilcdc_read(dev, LCDC_PID_REG));
247                 priv->rev = 1;
248                 break;
249         }
250 
251         pm_runtime_put_sync(dev->dev);
252 
253         ret = modeset_init(dev);
254         if (ret < 0) {
255                 dev_err(dev->dev, "failed to initialize mode setting\n");
256                 goto fail;
257         }
258 
259         ret = drm_vblank_init(dev, 1);
260         if (ret < 0) {
261                 dev_err(dev->dev, "failed to initialize vblank\n");
262                 goto fail;
263         }
264 
265         pm_runtime_get_sync(dev->dev);
266         ret = drm_irq_install(dev, platform_get_irq(dev->platformdev, 0));
267         pm_runtime_put_sync(dev->dev);
268         if (ret < 0) {
269                 dev_err(dev->dev, "failed to install IRQ handler\n");
270                 goto fail;
271         }
272 
273         platform_set_drvdata(pdev, dev);
274 
275 
276         list_for_each_entry(mod, &module_list, list) {
277                 DBG("%s: preferred_bpp: %d", mod->name, mod->preferred_bpp);
278                 bpp = mod->preferred_bpp;
279                 if (bpp > 0)
280                         break;
281         }
282 
283         priv->fbdev = drm_fbdev_cma_init(dev, bpp,
284                         dev->mode_config.num_crtc,
285                         dev->mode_config.num_connector);
286 
287         drm_kms_helper_poll_init(dev);
288 
289         return 0;
290 
291 fail:
292         tilcdc_unload(dev);
293         return ret;
294 }
295 
296 static void tilcdc_preclose(struct drm_device *dev, struct drm_file *file)
297 {
298         struct tilcdc_drm_private *priv = dev->dev_private;
299 
300         tilcdc_crtc_cancel_page_flip(priv->crtc, file);
301 }
302 
303 static void tilcdc_lastclose(struct drm_device *dev)
304 {
305         struct tilcdc_drm_private *priv = dev->dev_private;
306         drm_fbdev_cma_restore_mode(priv->fbdev);
307 }
308 
309 static irqreturn_t tilcdc_irq(int irq, void *arg)
310 {
311         struct drm_device *dev = arg;
312         struct tilcdc_drm_private *priv = dev->dev_private;
313         return tilcdc_crtc_irq(priv->crtc);
314 }
315 
316 static void tilcdc_irq_preinstall(struct drm_device *dev)
317 {
318         tilcdc_clear_irqstatus(dev, 0xffffffff);
319 }
320 
321 static int tilcdc_irq_postinstall(struct drm_device *dev)
322 {
323         struct tilcdc_drm_private *priv = dev->dev_private;
324 
325         /* enable FIFO underflow irq: */
326         if (priv->rev == 1)
327                 tilcdc_set(dev, LCDC_RASTER_CTRL_REG, LCDC_V1_UNDERFLOW_INT_ENA);
328         else
329                 tilcdc_set(dev, LCDC_INT_ENABLE_SET_REG, LCDC_V2_UNDERFLOW_INT_ENA);
330 
331         return 0;
332 }
333 
334 static void tilcdc_irq_uninstall(struct drm_device *dev)
335 {
336         struct tilcdc_drm_private *priv = dev->dev_private;
337 
338         /* disable irqs that we might have enabled: */
339         if (priv->rev == 1) {
340                 tilcdc_clear(dev, LCDC_RASTER_CTRL_REG,
341                                 LCDC_V1_UNDERFLOW_INT_ENA | LCDC_V1_PL_INT_ENA);
342                 tilcdc_clear(dev, LCDC_DMA_CTRL_REG, LCDC_V1_END_OF_FRAME_INT_ENA);
343         } else {
344                 tilcdc_clear(dev, LCDC_INT_ENABLE_SET_REG,
345                         LCDC_V2_UNDERFLOW_INT_ENA | LCDC_V2_PL_INT_ENA |
346                         LCDC_V2_END_OF_FRAME0_INT_ENA | LCDC_V2_END_OF_FRAME1_INT_ENA |
347                         LCDC_FRAME_DONE);
348         }
349 
350 }
351 
352 static void enable_vblank(struct drm_device *dev, bool enable)
353 {
354         struct tilcdc_drm_private *priv = dev->dev_private;
355         u32 reg, mask;
356 
357         if (priv->rev == 1) {
358                 reg = LCDC_DMA_CTRL_REG;
359                 mask = LCDC_V1_END_OF_FRAME_INT_ENA;
360         } else {
361                 reg = LCDC_INT_ENABLE_SET_REG;
362                 mask = LCDC_V2_END_OF_FRAME0_INT_ENA |
363                         LCDC_V2_END_OF_FRAME1_INT_ENA | LCDC_FRAME_DONE;
364         }
365 
366         if (enable)
367                 tilcdc_set(dev, reg, mask);
368         else
369                 tilcdc_clear(dev, reg, mask);
370 }
371 
372 static int tilcdc_enable_vblank(struct drm_device *dev, int crtc)
373 {
374         enable_vblank(dev, true);
375         return 0;
376 }
377 
378 static void tilcdc_disable_vblank(struct drm_device *dev, int crtc)
379 {
380         enable_vblank(dev, false);
381 }
382 
383 #if defined(CONFIG_DEBUG_FS) || defined(CONFIG_PM_SLEEP)
384 static const struct {
385         const char *name;
386         uint8_t  rev;
387         uint8_t  save;
388         uint32_t reg;
389 } registers[] =         {
390 #define REG(rev, save, reg) { #reg, rev, save, reg }
391                 /* exists in revision 1: */
392                 REG(1, false, LCDC_PID_REG),
393                 REG(1, true,  LCDC_CTRL_REG),
394                 REG(1, false, LCDC_STAT_REG),
395                 REG(1, true,  LCDC_RASTER_CTRL_REG),
396                 REG(1, true,  LCDC_RASTER_TIMING_0_REG),
397                 REG(1, true,  LCDC_RASTER_TIMING_1_REG),
398                 REG(1, true,  LCDC_RASTER_TIMING_2_REG),
399                 REG(1, true,  LCDC_DMA_CTRL_REG),
400                 REG(1, true,  LCDC_DMA_FB_BASE_ADDR_0_REG),
401                 REG(1, true,  LCDC_DMA_FB_CEILING_ADDR_0_REG),
402                 REG(1, true,  LCDC_DMA_FB_BASE_ADDR_1_REG),
403                 REG(1, true,  LCDC_DMA_FB_CEILING_ADDR_1_REG),
404                 /* new in revision 2: */
405                 REG(2, false, LCDC_RAW_STAT_REG),
406                 REG(2, false, LCDC_MASKED_STAT_REG),
407                 REG(2, false, LCDC_INT_ENABLE_SET_REG),
408                 REG(2, false, LCDC_INT_ENABLE_CLR_REG),
409                 REG(2, false, LCDC_END_OF_INT_IND_REG),
410                 REG(2, true,  LCDC_CLK_ENABLE_REG),
411                 REG(2, true,  LCDC_INT_ENABLE_SET_REG),
412 #undef REG
413 };
414 #endif
415 
416 #ifdef CONFIG_DEBUG_FS
417 static int tilcdc_regs_show(struct seq_file *m, void *arg)
418 {
419         struct drm_info_node *node = (struct drm_info_node *) m->private;
420         struct drm_device *dev = node->minor->dev;
421         struct tilcdc_drm_private *priv = dev->dev_private;
422         unsigned i;
423 
424         pm_runtime_get_sync(dev->dev);
425 
426         seq_printf(m, "revision: %d\n", priv->rev);
427 
428         for (i = 0; i < ARRAY_SIZE(registers); i++)
429                 if (priv->rev >= registers[i].rev)
430                         seq_printf(m, "%s:\t %08x\n", registers[i].name,
431                                         tilcdc_read(dev, registers[i].reg));
432 
433         pm_runtime_put_sync(dev->dev);
434 
435         return 0;
436 }
437 
438 static int tilcdc_mm_show(struct seq_file *m, void *arg)
439 {
440         struct drm_info_node *node = (struct drm_info_node *) m->private;
441         struct drm_device *dev = node->minor->dev;
442         return drm_mm_dump_table(m, &dev->vma_offset_manager->vm_addr_space_mm);
443 }
444 
445 static struct drm_info_list tilcdc_debugfs_list[] = {
446                 { "regs", tilcdc_regs_show, 0 },
447                 { "mm",   tilcdc_mm_show,   0 },
448                 { "fb",   drm_fb_cma_debugfs_show, 0 },
449 };
450 
451 static int tilcdc_debugfs_init(struct drm_minor *minor)
452 {
453         struct drm_device *dev = minor->dev;
454         struct tilcdc_module *mod;
455         int ret;
456 
457         ret = drm_debugfs_create_files(tilcdc_debugfs_list,
458                         ARRAY_SIZE(tilcdc_debugfs_list),
459                         minor->debugfs_root, minor);
460 
461         list_for_each_entry(mod, &module_list, list)
462                 if (mod->funcs->debugfs_init)
463                         mod->funcs->debugfs_init(mod, minor);
464 
465         if (ret) {
466                 dev_err(dev->dev, "could not install tilcdc_debugfs_list\n");
467                 return ret;
468         }
469 
470         return ret;
471 }
472 
473 static void tilcdc_debugfs_cleanup(struct drm_minor *minor)
474 {
475         struct tilcdc_module *mod;
476         drm_debugfs_remove_files(tilcdc_debugfs_list,
477                         ARRAY_SIZE(tilcdc_debugfs_list), minor);
478 
479         list_for_each_entry(mod, &module_list, list)
480                 if (mod->funcs->debugfs_cleanup)
481                         mod->funcs->debugfs_cleanup(mod, minor);
482 }
483 #endif
484 
485 static const struct file_operations fops = {
486         .owner              = THIS_MODULE,
487         .open               = drm_open,
488         .release            = drm_release,
489         .unlocked_ioctl     = drm_ioctl,
490 #ifdef CONFIG_COMPAT
491         .compat_ioctl       = drm_compat_ioctl,
492 #endif
493         .poll               = drm_poll,
494         .read               = drm_read,
495         .llseek             = no_llseek,
496         .mmap               = drm_gem_cma_mmap,
497 };
498 
499 static struct drm_driver tilcdc_driver = {
500         .driver_features    = DRIVER_HAVE_IRQ | DRIVER_GEM | DRIVER_MODESET,
501         .load               = tilcdc_load,
502         .unload             = tilcdc_unload,
503         .preclose           = tilcdc_preclose,
504         .lastclose          = tilcdc_lastclose,
505         .irq_handler        = tilcdc_irq,
506         .irq_preinstall     = tilcdc_irq_preinstall,
507         .irq_postinstall    = tilcdc_irq_postinstall,
508         .irq_uninstall      = tilcdc_irq_uninstall,
509         .get_vblank_counter = drm_vblank_count,
510         .enable_vblank      = tilcdc_enable_vblank,
511         .disable_vblank     = tilcdc_disable_vblank,
512         .gem_free_object    = drm_gem_cma_free_object,
513         .gem_vm_ops         = &drm_gem_cma_vm_ops,
514         .dumb_create        = drm_gem_cma_dumb_create,
515         .dumb_map_offset    = drm_gem_cma_dumb_map_offset,
516         .dumb_destroy       = drm_gem_dumb_destroy,
517 #ifdef CONFIG_DEBUG_FS
518         .debugfs_init       = tilcdc_debugfs_init,
519         .debugfs_cleanup    = tilcdc_debugfs_cleanup,
520 #endif
521         .fops               = &fops,
522         .name               = "tilcdc",
523         .desc               = "TI LCD Controller DRM",
524         .date               = "20121205",
525         .major              = 1,
526         .minor              = 0,
527 };
528 
529 /*
530  * Power management:
531  */
532 
533 #ifdef CONFIG_PM_SLEEP
534 static int tilcdc_pm_suspend(struct device *dev)
535 {
536         struct drm_device *ddev = dev_get_drvdata(dev);
537         struct tilcdc_drm_private *priv = ddev->dev_private;
538         unsigned i, n = 0;
539 
540         drm_kms_helper_poll_disable(ddev);
541 
542         /* Save register state: */
543         for (i = 0; i < ARRAY_SIZE(registers); i++)
544                 if (registers[i].save && (priv->rev >= registers[i].rev))
545                         priv->saved_register[n++] = tilcdc_read(ddev, registers[i].reg);
546 
547         return 0;
548 }
549 
550 static int tilcdc_pm_resume(struct device *dev)
551 {
552         struct drm_device *ddev = dev_get_drvdata(dev);
553         struct tilcdc_drm_private *priv = ddev->dev_private;
554         unsigned i, n = 0;
555 
556         /* Restore register state: */
557         for (i = 0; i < ARRAY_SIZE(registers); i++)
558                 if (registers[i].save && (priv->rev >= registers[i].rev))
559                         tilcdc_write(ddev, registers[i].reg, priv->saved_register[n++]);
560 
561         drm_kms_helper_poll_enable(ddev);
562 
563         return 0;
564 }
565 #endif
566 
567 static const struct dev_pm_ops tilcdc_pm_ops = {
568         SET_SYSTEM_SLEEP_PM_OPS(tilcdc_pm_suspend, tilcdc_pm_resume)
569 };
570 
571 /*
572  * Platform driver:
573  */
574 
575 static int tilcdc_pdev_probe(struct platform_device *pdev)
576 {
577         /* bail out early if no DT data: */
578         if (!pdev->dev.of_node) {
579                 dev_err(&pdev->dev, "device-tree data is missing\n");
580                 return -ENXIO;
581         }
582 
583         /* defer probing if slave is in deferred probing */
584         if (slave_probing == true)
585                 return -EPROBE_DEFER;
586 
587         return drm_platform_init(&tilcdc_driver, pdev);
588 }
589 
590 static int tilcdc_pdev_remove(struct platform_device *pdev)
591 {
592         drm_put_dev(platform_get_drvdata(pdev));
593 
594         return 0;
595 }
596 
597 static struct of_device_id tilcdc_of_match[] = {
598                 { .compatible = "ti,am33xx-tilcdc", },
599                 { },
600 };
601 MODULE_DEVICE_TABLE(of, tilcdc_of_match);
602 
603 static struct platform_driver tilcdc_platform_driver = {
604         .probe      = tilcdc_pdev_probe,
605         .remove     = tilcdc_pdev_remove,
606         .driver     = {
607                 .owner  = THIS_MODULE,
608                 .name   = "tilcdc",
609                 .pm     = &tilcdc_pm_ops,
610                 .of_match_table = tilcdc_of_match,
611         },
612 };
613 
614 static int __init tilcdc_drm_init(void)
615 {
616         DBG("init");
617         tilcdc_tfp410_init();
618         tilcdc_slave_init();
619         tilcdc_panel_init();
620         return platform_driver_register(&tilcdc_platform_driver);
621 }
622 
623 static void __exit tilcdc_drm_fini(void)
624 {
625         DBG("fini");
626         platform_driver_unregister(&tilcdc_platform_driver);
627         tilcdc_panel_fini();
628         tilcdc_slave_fini();
629         tilcdc_tfp410_fini();
630 }
631 
632 module_init(tilcdc_drm_init);
633 module_exit(tilcdc_drm_fini);
634 
635 MODULE_AUTHOR("Rob Clark <robdclark@gmail.com");
636 MODULE_DESCRIPTION("TI LCD Controller DRM Driver");
637 MODULE_LICENSE("GPL");
638 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us