2 * Freescale i.MX drm driver
4 * Copyright (C) 2011 Sascha Hauer, Pengutronix
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version 2
9 * of the License, or (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
17 #include <linux/device.h>
18 #include <linux/platform_device.h>
20 #include <drm/drm_fb_helper.h>
21 #include <drm/drm_crtc_helper.h>
23 #include <linux/module.h>
24 #include <drm/drm_gem_cma_helper.h>
25 #include <drm/drm_fb_cma_helper.h>
34 struct list_head list;
37 struct imx_drm_device {
38 struct drm_device *drm;
40 struct list_head crtc_list;
41 struct list_head encoder_list;
42 struct list_head connector_list;
46 struct drm_fbdev_cma *fbhelper;
50 struct drm_crtc *crtc;
51 struct list_head list;
52 struct imx_drm_device *imxdrm;
54 struct imx_drm_crtc_helper_funcs imx_drm_helper_funcs;
56 struct crtc_cookie cookie;
59 struct imx_drm_encoder {
60 struct drm_encoder *encoder;
61 struct list_head list;
63 struct list_head possible_crtcs;
66 struct imx_drm_connector {
67 struct drm_connector *connector;
68 struct list_head list;
72 static int imx_drm_driver_firstopen(struct drm_device *drm)
74 if (!imx_drm_device_get())
80 static void imx_drm_driver_lastclose(struct drm_device *drm)
82 struct imx_drm_device *imxdrm = drm->dev_private;
85 drm_fbdev_cma_restore_mode(imxdrm->fbhelper);
90 static int imx_drm_driver_unload(struct drm_device *drm)
92 struct imx_drm_device *imxdrm = drm->dev_private;
94 drm_mode_config_cleanup(imxdrm->drm);
95 drm_kms_helper_poll_fini(imxdrm->drm);
101 * We don't care at all for crtc numbers, but the core expects the
102 * crtcs to be numbered
104 static struct imx_drm_crtc *imx_drm_crtc_by_num(struct imx_drm_device *imxdrm,
107 struct imx_drm_crtc *imx_drm_crtc;
109 list_for_each_entry(imx_drm_crtc, &imxdrm->crtc_list, list)
110 if (imx_drm_crtc->pipe == num)
115 int imx_drm_crtc_panel_format(struct drm_crtc *crtc, u32 encoder_type,
116 u32 interface_pix_fmt)
118 struct imx_drm_device *imxdrm = crtc->dev->dev_private;
119 struct imx_drm_crtc *imx_crtc;
120 struct imx_drm_crtc_helper_funcs *helper;
122 mutex_lock(&imxdrm->mutex);
124 list_for_each_entry(imx_crtc, &imxdrm->crtc_list, list)
125 if (imx_crtc->crtc == crtc)
128 mutex_unlock(&imxdrm->mutex);
132 mutex_unlock(&imxdrm->mutex);
134 helper = &imx_crtc->imx_drm_helper_funcs;
135 if (helper->set_interface_pix_fmt)
136 return helper->set_interface_pix_fmt(crtc,
137 encoder_type, interface_pix_fmt);
140 EXPORT_SYMBOL_GPL(imx_drm_crtc_panel_format);
142 int imx_drm_crtc_vblank_get(struct imx_drm_crtc *imx_drm_crtc)
144 return drm_vblank_get(imx_drm_crtc->imxdrm->drm, imx_drm_crtc->pipe);
146 EXPORT_SYMBOL_GPL(imx_drm_crtc_vblank_get);
148 void imx_drm_crtc_vblank_put(struct imx_drm_crtc *imx_drm_crtc)
150 drm_vblank_put(imx_drm_crtc->imxdrm->drm, imx_drm_crtc->pipe);
152 EXPORT_SYMBOL_GPL(imx_drm_crtc_vblank_put);
154 void imx_drm_handle_vblank(struct imx_drm_crtc *imx_drm_crtc)
156 drm_handle_vblank(imx_drm_crtc->imxdrm->drm, imx_drm_crtc->pipe);
158 EXPORT_SYMBOL_GPL(imx_drm_handle_vblank);
160 static int imx_drm_enable_vblank(struct drm_device *drm, int crtc)
162 struct imx_drm_device *imxdrm = drm->dev_private;
163 struct imx_drm_crtc *imx_drm_crtc;
166 imx_drm_crtc = imx_drm_crtc_by_num(imxdrm, crtc);
170 if (!imx_drm_crtc->imx_drm_helper_funcs.enable_vblank)
173 ret = imx_drm_crtc->imx_drm_helper_funcs.enable_vblank(
179 static void imx_drm_disable_vblank(struct drm_device *drm, int crtc)
181 struct imx_drm_device *imxdrm = drm->dev_private;
182 struct imx_drm_crtc *imx_drm_crtc;
184 imx_drm_crtc = imx_drm_crtc_by_num(imxdrm, crtc);
188 if (!imx_drm_crtc->imx_drm_helper_funcs.disable_vblank)
191 imx_drm_crtc->imx_drm_helper_funcs.disable_vblank(imx_drm_crtc->crtc);
194 static const struct file_operations imx_drm_driver_fops = {
195 .owner = THIS_MODULE,
197 .release = drm_release,
198 .unlocked_ioctl = drm_ioctl,
199 .mmap = drm_gem_cma_mmap,
201 .fasync = drm_fasync,
203 .llseek = noop_llseek,
206 static struct imx_drm_device *imx_drm_device;
208 static struct imx_drm_device *__imx_drm_device(void)
210 return imx_drm_device;
213 struct drm_device *imx_drm_device_get(void)
215 struct imx_drm_device *imxdrm = __imx_drm_device();
216 struct imx_drm_encoder *enc;
217 struct imx_drm_connector *con;
218 struct imx_drm_crtc *crtc;
220 mutex_lock(&imxdrm->mutex);
222 list_for_each_entry(enc, &imxdrm->encoder_list, list) {
223 if (!try_module_get(enc->owner)) {
224 dev_err(imxdrm->dev, "could not get module %s\n",
225 module_name(enc->owner));
230 list_for_each_entry(con, &imxdrm->connector_list, list) {
231 if (!try_module_get(con->owner)) {
232 dev_err(imxdrm->dev, "could not get module %s\n",
233 module_name(con->owner));
238 list_for_each_entry(crtc, &imxdrm->crtc_list, list) {
239 if (!try_module_get(crtc->owner)) {
240 dev_err(imxdrm->dev, "could not get module %s\n",
241 module_name(crtc->owner));
246 imxdrm->references++;
248 mutex_unlock(&imxdrm->mutex);
253 list_for_each_entry_continue_reverse(crtc, &imxdrm->crtc_list, list)
254 module_put(crtc->owner);
256 list_for_each_entry_continue_reverse(con, &imxdrm->connector_list, list)
257 module_put(con->owner);
259 list_for_each_entry_continue_reverse(enc, &imxdrm->encoder_list, list)
260 module_put(enc->owner);
262 mutex_unlock(&imxdrm->mutex);
267 EXPORT_SYMBOL_GPL(imx_drm_device_get);
269 void imx_drm_device_put(void)
271 struct imx_drm_device *imxdrm = __imx_drm_device();
272 struct imx_drm_encoder *enc;
273 struct imx_drm_connector *con;
274 struct imx_drm_crtc *crtc;
276 mutex_lock(&imxdrm->mutex);
278 list_for_each_entry(crtc, &imxdrm->crtc_list, list)
279 module_put(crtc->owner);
281 list_for_each_entry(con, &imxdrm->connector_list, list)
282 module_put(con->owner);
284 list_for_each_entry(enc, &imxdrm->encoder_list, list)
285 module_put(enc->owner);
287 imxdrm->references--;
289 mutex_unlock(&imxdrm->mutex);
291 EXPORT_SYMBOL_GPL(imx_drm_device_put);
293 static int drm_mode_group_reinit(struct drm_device *dev)
295 struct drm_mode_group *group = &dev->primary->mode_group;
296 uint32_t *id_list = group->id_list;
299 ret = drm_mode_group_init_legacy_group(dev, group);
308 * register an encoder to the drm core
310 static int imx_drm_encoder_register(struct imx_drm_encoder *imx_drm_encoder)
312 struct imx_drm_device *imxdrm = __imx_drm_device();
314 INIT_LIST_HEAD(&imx_drm_encoder->possible_crtcs);
316 drm_encoder_init(imxdrm->drm, imx_drm_encoder->encoder,
317 imx_drm_encoder->encoder->funcs,
318 imx_drm_encoder->encoder->encoder_type);
320 drm_mode_group_reinit(imxdrm->drm);
326 * unregister an encoder from the drm core
328 static void imx_drm_encoder_unregister(struct imx_drm_encoder
331 struct imx_drm_device *imxdrm = __imx_drm_device();
333 drm_encoder_cleanup(imx_drm_encoder->encoder);
335 drm_mode_group_reinit(imxdrm->drm);
339 * register a connector to the drm core
341 static int imx_drm_connector_register(
342 struct imx_drm_connector *imx_drm_connector)
344 struct imx_drm_device *imxdrm = __imx_drm_device();
346 drm_connector_init(imxdrm->drm, imx_drm_connector->connector,
347 imx_drm_connector->connector->funcs,
348 imx_drm_connector->connector->connector_type);
349 drm_mode_group_reinit(imxdrm->drm);
351 return drm_sysfs_connector_add(imx_drm_connector->connector);
355 * unregister a connector from the drm core
357 static void imx_drm_connector_unregister(
358 struct imx_drm_connector *imx_drm_connector)
360 struct imx_drm_device *imxdrm = __imx_drm_device();
362 drm_sysfs_connector_remove(imx_drm_connector->connector);
363 drm_connector_cleanup(imx_drm_connector->connector);
365 drm_mode_group_reinit(imxdrm->drm);
369 * register a crtc to the drm core
371 static int imx_drm_crtc_register(struct imx_drm_crtc *imx_drm_crtc)
373 struct imx_drm_device *imxdrm = __imx_drm_device();
376 drm_crtc_init(imxdrm->drm, imx_drm_crtc->crtc,
377 imx_drm_crtc->imx_drm_helper_funcs.crtc_funcs);
378 ret = drm_mode_crtc_set_gamma_size(imx_drm_crtc->crtc, 256);
382 drm_crtc_helper_add(imx_drm_crtc->crtc,
383 imx_drm_crtc->imx_drm_helper_funcs.crtc_helper_funcs);
385 drm_mode_group_reinit(imxdrm->drm);
391 * Called by the CRTC driver when all CRTCs are registered. This
392 * puts all the pieces together and initializes the driver.
393 * Once this is called no more CRTCs can be registered since
394 * the drm core has hardcoded the number of crtcs in several
397 static int imx_drm_driver_load(struct drm_device *drm, unsigned long flags)
399 struct imx_drm_device *imxdrm = __imx_drm_device();
404 drm->dev_private = imxdrm;
407 * enable drm irq mode.
408 * - with irq_enabled = 1, we can use the vblank feature.
410 * P.S. note that we wouldn't use drm irq handler but
411 * just specific driver own one instead because
412 * drm framework supports only one irq handler and
413 * drivers can well take care of their interrupts
415 drm->irq_enabled = 1;
417 drm_mode_config_init(drm);
418 imx_drm_mode_config_init(drm);
420 mutex_lock(&imxdrm->mutex);
422 drm_kms_helper_poll_init(imxdrm->drm);
424 /* setup the grouping for the legacy output */
425 ret = drm_mode_group_init_legacy_group(imxdrm->drm,
426 &imxdrm->drm->primary->mode_group);
430 ret = drm_vblank_init(imxdrm->drm, MAX_CRTC);
435 * with vblank_disable_allowed = 1, vblank interrupt will be disabled
436 * by drm timer once a current process gives up ownership of
437 * vblank event.(after drm_vblank_put function is called)
439 imxdrm->drm->vblank_disable_allowed = 1;
444 mutex_unlock(&imxdrm->mutex);
449 static void imx_drm_update_possible_crtcs(void)
451 struct imx_drm_device *imxdrm = __imx_drm_device();
452 struct imx_drm_crtc *imx_drm_crtc;
453 struct imx_drm_encoder *enc;
454 struct crtc_cookie *cookie;
456 list_for_each_entry(enc, &imxdrm->encoder_list, list) {
457 u32 possible_crtcs = 0;
459 list_for_each_entry(cookie, &enc->possible_crtcs, list) {
460 list_for_each_entry(imx_drm_crtc, &imxdrm->crtc_list, list) {
461 if (imx_drm_crtc->cookie.cookie == cookie->cookie &&
462 imx_drm_crtc->cookie.id == cookie->id) {
463 possible_crtcs |= 1 << imx_drm_crtc->pipe;
467 enc->encoder->possible_crtcs = possible_crtcs;
468 enc->encoder->possible_clones = possible_crtcs;
473 * imx_drm_add_crtc - add a new crtc
475 * The return value if !NULL is a cookie for the caller to pass to
476 * imx_drm_remove_crtc later.
478 int imx_drm_add_crtc(struct drm_crtc *crtc,
479 struct imx_drm_crtc **new_crtc,
480 const struct imx_drm_crtc_helper_funcs *imx_drm_helper_funcs,
481 struct module *owner, void *cookie, int id)
483 struct imx_drm_device *imxdrm = __imx_drm_device();
484 struct imx_drm_crtc *imx_drm_crtc;
485 const struct drm_crtc_funcs *crtc_funcs;
488 mutex_lock(&imxdrm->mutex);
490 if (imxdrm->references) {
495 imx_drm_crtc = kzalloc(sizeof(*imx_drm_crtc), GFP_KERNEL);
501 imx_drm_crtc->imx_drm_helper_funcs = *imx_drm_helper_funcs;
502 imx_drm_crtc->pipe = imxdrm->pipes++;
503 imx_drm_crtc->cookie.cookie = cookie;
504 imx_drm_crtc->cookie.id = id;
506 crtc_funcs = imx_drm_helper_funcs->crtc_funcs;
508 imx_drm_crtc->crtc = crtc;
509 imx_drm_crtc->imxdrm = imxdrm;
511 imx_drm_crtc->owner = owner;
513 list_add_tail(&imx_drm_crtc->list, &imxdrm->crtc_list);
515 *new_crtc = imx_drm_crtc;
517 ret = imx_drm_crtc_register(imx_drm_crtc);
521 imx_drm_update_possible_crtcs();
523 mutex_unlock(&imxdrm->mutex);
531 mutex_unlock(&imxdrm->mutex);
534 EXPORT_SYMBOL_GPL(imx_drm_add_crtc);
537 * imx_drm_remove_crtc - remove a crtc
539 int imx_drm_remove_crtc(struct imx_drm_crtc *imx_drm_crtc)
541 struct imx_drm_device *imxdrm = imx_drm_crtc->imxdrm;
543 mutex_lock(&imxdrm->mutex);
545 drm_crtc_cleanup(imx_drm_crtc->crtc);
547 list_del(&imx_drm_crtc->list);
549 drm_mode_group_reinit(imxdrm->drm);
551 mutex_unlock(&imxdrm->mutex);
557 EXPORT_SYMBOL_GPL(imx_drm_remove_crtc);
560 * imx_drm_add_encoder - add a new encoder
562 int imx_drm_add_encoder(struct drm_encoder *encoder,
563 struct imx_drm_encoder **newenc, struct module *owner)
565 struct imx_drm_device *imxdrm = __imx_drm_device();
566 struct imx_drm_encoder *imx_drm_encoder;
569 mutex_lock(&imxdrm->mutex);
571 if (imxdrm->references) {
576 imx_drm_encoder = kzalloc(sizeof(*imx_drm_encoder), GFP_KERNEL);
577 if (!imx_drm_encoder) {
582 imx_drm_encoder->encoder = encoder;
583 imx_drm_encoder->owner = owner;
585 ret = imx_drm_encoder_register(imx_drm_encoder);
587 kfree(imx_drm_encoder);
592 list_add_tail(&imx_drm_encoder->list, &imxdrm->encoder_list);
594 *newenc = imx_drm_encoder;
596 mutex_unlock(&imxdrm->mutex);
601 kfree(imx_drm_encoder);
604 mutex_unlock(&imxdrm->mutex);
608 EXPORT_SYMBOL_GPL(imx_drm_add_encoder);
610 int imx_drm_encoder_add_possible_crtcs(
611 struct imx_drm_encoder *imx_drm_encoder,
612 struct device_node *np)
614 struct imx_drm_device *imxdrm = __imx_drm_device();
615 struct of_phandle_args args;
616 struct crtc_cookie *c;
620 if (!list_empty(&imx_drm_encoder->possible_crtcs))
623 for (i = 0; !ret; i++) {
624 ret = of_parse_phandle_with_args(np, "crtcs",
625 "#crtc-cells", i, &args);
629 c = kzalloc(sizeof(*c), GFP_KERNEL);
631 of_node_put(args.np);
636 c->id = args.args_count > 0 ? args.args[0] : 0;
638 of_node_put(args.np);
640 mutex_lock(&imxdrm->mutex);
642 list_add_tail(&c->list, &imx_drm_encoder->possible_crtcs);
644 mutex_unlock(&imxdrm->mutex);
647 imx_drm_update_possible_crtcs();
651 EXPORT_SYMBOL_GPL(imx_drm_encoder_add_possible_crtcs);
653 int imx_drm_encoder_get_mux_id(struct imx_drm_encoder *imx_drm_encoder,
654 struct drm_crtc *crtc)
656 struct imx_drm_device *imxdrm = __imx_drm_device();
657 struct imx_drm_crtc *imx_crtc;
660 mutex_lock(&imxdrm->mutex);
662 list_for_each_entry(imx_crtc, &imxdrm->crtc_list, list) {
663 if (imx_crtc->crtc == crtc)
668 mutex_unlock(&imxdrm->mutex);
672 mutex_unlock(&imxdrm->mutex);
678 * imx_drm_remove_encoder - remove an encoder
680 int imx_drm_remove_encoder(struct imx_drm_encoder *imx_drm_encoder)
682 struct imx_drm_device *imxdrm = __imx_drm_device();
683 struct crtc_cookie *c, *tmp;
685 mutex_lock(&imxdrm->mutex);
687 imx_drm_encoder_unregister(imx_drm_encoder);
689 list_del(&imx_drm_encoder->list);
691 list_for_each_entry_safe(c, tmp, &imx_drm_encoder->possible_crtcs,
695 mutex_unlock(&imxdrm->mutex);
697 kfree(imx_drm_encoder);
701 EXPORT_SYMBOL_GPL(imx_drm_remove_encoder);
704 * imx_drm_add_connector - add a connector
706 int imx_drm_add_connector(struct drm_connector *connector,
707 struct imx_drm_connector **new_con,
708 struct module *owner)
710 struct imx_drm_device *imxdrm = __imx_drm_device();
711 struct imx_drm_connector *imx_drm_connector;
714 mutex_lock(&imxdrm->mutex);
716 if (imxdrm->references) {
721 imx_drm_connector = kzalloc(sizeof(*imx_drm_connector), GFP_KERNEL);
722 if (!imx_drm_connector) {
727 imx_drm_connector->connector = connector;
728 imx_drm_connector->owner = owner;
730 ret = imx_drm_connector_register(imx_drm_connector);
734 list_add_tail(&imx_drm_connector->list, &imxdrm->connector_list);
736 *new_con = imx_drm_connector;
738 mutex_unlock(&imxdrm->mutex);
743 kfree(imx_drm_connector);
746 mutex_unlock(&imxdrm->mutex);
750 EXPORT_SYMBOL_GPL(imx_drm_add_connector);
752 void imx_drm_fb_helper_set(struct drm_fbdev_cma *fbdev_helper)
754 struct imx_drm_device *imxdrm = __imx_drm_device();
756 imxdrm->fbhelper = fbdev_helper;
758 EXPORT_SYMBOL_GPL(imx_drm_fb_helper_set);
761 * imx_drm_remove_connector - remove a connector
763 int imx_drm_remove_connector(struct imx_drm_connector *imx_drm_connector)
765 struct imx_drm_device *imxdrm = __imx_drm_device();
767 mutex_lock(&imxdrm->mutex);
769 imx_drm_connector_unregister(imx_drm_connector);
771 list_del(&imx_drm_connector->list);
773 mutex_unlock(&imxdrm->mutex);
775 kfree(imx_drm_connector);
779 EXPORT_SYMBOL_GPL(imx_drm_remove_connector);
781 static struct drm_ioctl_desc imx_drm_ioctls[] = {
785 static struct drm_driver imx_drm_driver = {
786 .driver_features = DRIVER_MODESET | DRIVER_GEM,
787 .load = imx_drm_driver_load,
788 .unload = imx_drm_driver_unload,
789 .firstopen = imx_drm_driver_firstopen,
790 .lastclose = imx_drm_driver_lastclose,
791 .gem_free_object = drm_gem_cma_free_object,
792 .gem_vm_ops = &drm_gem_cma_vm_ops,
793 .dumb_create = drm_gem_cma_dumb_create,
794 .dumb_map_offset = drm_gem_cma_dumb_map_offset,
795 .dumb_destroy = drm_gem_cma_dumb_destroy,
797 .get_vblank_counter = drm_vblank_count,
798 .enable_vblank = imx_drm_enable_vblank,
799 .disable_vblank = imx_drm_disable_vblank,
800 .ioctls = imx_drm_ioctls,
801 .num_ioctls = ARRAY_SIZE(imx_drm_ioctls),
802 .fops = &imx_drm_driver_fops,
804 .desc = "i.MX DRM graphics",
811 static int imx_drm_platform_probe(struct platform_device *pdev)
813 imx_drm_device->dev = &pdev->dev;
815 return drm_platform_init(&imx_drm_driver, pdev);
818 static int imx_drm_platform_remove(struct platform_device *pdev)
820 drm_platform_exit(&imx_drm_driver, pdev);
825 static struct platform_driver imx_drm_pdrv = {
826 .probe = imx_drm_platform_probe,
827 .remove = __devexit_p(imx_drm_platform_remove),
829 .owner = THIS_MODULE,
834 static struct platform_device *imx_drm_pdev;
836 static int __init imx_drm_init(void)
840 imx_drm_device = kzalloc(sizeof(*imx_drm_device), GFP_KERNEL);
844 mutex_init(&imx_drm_device->mutex);
845 INIT_LIST_HEAD(&imx_drm_device->crtc_list);
846 INIT_LIST_HEAD(&imx_drm_device->connector_list);
847 INIT_LIST_HEAD(&imx_drm_device->encoder_list);
849 imx_drm_pdev = platform_device_register_simple("imx-drm", -1, NULL, 0);
855 imx_drm_pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32),
857 ret = platform_driver_register(&imx_drm_pdrv);
864 platform_device_unregister(imx_drm_pdev);
866 kfree(imx_drm_device);
871 static void __exit imx_drm_exit(void)
873 platform_device_unregister(imx_drm_pdev);
874 platform_driver_unregister(&imx_drm_pdrv);
876 kfree(imx_drm_device);
879 module_init(imx_drm_init);
880 module_exit(imx_drm_exit);
882 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
883 MODULE_DESCRIPTION("i.MX drm driver core");
884 MODULE_LICENSE("GPL");