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;
45 struct drm_fbdev_cma *fbhelper;
49 struct drm_crtc *crtc;
50 struct list_head list;
51 struct imx_drm_device *imxdrm;
53 struct imx_drm_crtc_helper_funcs imx_drm_helper_funcs;
55 struct crtc_cookie cookie;
58 struct imx_drm_encoder {
59 struct drm_encoder *encoder;
60 struct list_head list;
62 struct list_head possible_crtcs;
65 struct imx_drm_connector {
66 struct drm_connector *connector;
67 struct list_head list;
71 static void imx_drm_driver_lastclose(struct drm_device *drm)
73 struct imx_drm_device *imxdrm = drm->dev_private;
76 drm_fbdev_cma_restore_mode(imxdrm->fbhelper);
79 static int imx_drm_driver_unload(struct drm_device *drm)
81 struct imx_drm_device *imxdrm = drm->dev_private;
85 drm_mode_config_cleanup(imxdrm->drm);
86 drm_kms_helper_poll_fini(imxdrm->drm);
92 * We don't care at all for crtc numbers, but the core expects the
93 * crtcs to be numbered
95 static struct imx_drm_crtc *imx_drm_crtc_by_num(struct imx_drm_device *imxdrm,
98 struct imx_drm_crtc *imx_drm_crtc;
100 list_for_each_entry(imx_drm_crtc, &imxdrm->crtc_list, list)
101 if (imx_drm_crtc->pipe == num)
106 int imx_drm_crtc_panel_format_pins(struct drm_crtc *crtc, u32 encoder_type,
107 u32 interface_pix_fmt, int hsync_pin, int vsync_pin)
109 struct imx_drm_device *imxdrm = crtc->dev->dev_private;
110 struct imx_drm_crtc *imx_crtc;
111 struct imx_drm_crtc_helper_funcs *helper;
113 mutex_lock(&imxdrm->mutex);
115 list_for_each_entry(imx_crtc, &imxdrm->crtc_list, list)
116 if (imx_crtc->crtc == crtc)
119 mutex_unlock(&imxdrm->mutex);
123 mutex_unlock(&imxdrm->mutex);
125 helper = &imx_crtc->imx_drm_helper_funcs;
126 if (helper->set_interface_pix_fmt)
127 return helper->set_interface_pix_fmt(crtc,
128 encoder_type, interface_pix_fmt,
129 hsync_pin, vsync_pin);
132 EXPORT_SYMBOL_GPL(imx_drm_crtc_panel_format_pins);
134 int imx_drm_crtc_panel_format(struct drm_crtc *crtc, u32 encoder_type,
135 u32 interface_pix_fmt)
137 return imx_drm_crtc_panel_format_pins(crtc, encoder_type,
138 interface_pix_fmt, 2, 3);
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,
202 .llseek = noop_llseek,
205 static struct imx_drm_device *imx_drm_device;
207 static struct imx_drm_device *__imx_drm_device(void)
209 return imx_drm_device;
212 struct drm_device *imx_drm_device_get(void)
214 struct imx_drm_device *imxdrm = __imx_drm_device();
215 struct imx_drm_encoder *enc;
216 struct imx_drm_connector *con;
217 struct imx_drm_crtc *crtc;
219 list_for_each_entry(enc, &imxdrm->encoder_list, list) {
220 if (!try_module_get(enc->owner)) {
221 dev_err(imxdrm->dev, "could not get module %s\n",
222 module_name(enc->owner));
227 list_for_each_entry(con, &imxdrm->connector_list, list) {
228 if (!try_module_get(con->owner)) {
229 dev_err(imxdrm->dev, "could not get module %s\n",
230 module_name(con->owner));
235 list_for_each_entry(crtc, &imxdrm->crtc_list, list) {
236 if (!try_module_get(crtc->owner)) {
237 dev_err(imxdrm->dev, "could not get module %s\n",
238 module_name(crtc->owner));
246 list_for_each_entry_continue_reverse(crtc, &imxdrm->crtc_list, list)
247 module_put(crtc->owner);
249 list_for_each_entry_continue_reverse(con, &imxdrm->connector_list, list)
250 module_put(con->owner);
252 list_for_each_entry_continue_reverse(enc, &imxdrm->encoder_list, list)
253 module_put(enc->owner);
255 mutex_unlock(&imxdrm->mutex);
260 EXPORT_SYMBOL_GPL(imx_drm_device_get);
262 void imx_drm_device_put(void)
264 struct imx_drm_device *imxdrm = __imx_drm_device();
265 struct imx_drm_encoder *enc;
266 struct imx_drm_connector *con;
267 struct imx_drm_crtc *crtc;
269 mutex_lock(&imxdrm->mutex);
271 list_for_each_entry(crtc, &imxdrm->crtc_list, list)
272 module_put(crtc->owner);
274 list_for_each_entry(con, &imxdrm->connector_list, list)
275 module_put(con->owner);
277 list_for_each_entry(enc, &imxdrm->encoder_list, list)
278 module_put(enc->owner);
280 mutex_unlock(&imxdrm->mutex);
282 EXPORT_SYMBOL_GPL(imx_drm_device_put);
284 static int drm_mode_group_reinit(struct drm_device *dev)
286 struct drm_mode_group *group = &dev->primary->mode_group;
287 uint32_t *id_list = group->id_list;
290 ret = drm_mode_group_init_legacy_group(dev, group);
299 * register an encoder to the drm core
301 static int imx_drm_encoder_register(struct imx_drm_encoder *imx_drm_encoder)
303 struct imx_drm_device *imxdrm = __imx_drm_device();
305 INIT_LIST_HEAD(&imx_drm_encoder->possible_crtcs);
307 drm_encoder_init(imxdrm->drm, imx_drm_encoder->encoder,
308 imx_drm_encoder->encoder->funcs,
309 imx_drm_encoder->encoder->encoder_type);
311 drm_mode_group_reinit(imxdrm->drm);
317 * unregister an encoder from the drm core
319 static void imx_drm_encoder_unregister(struct imx_drm_encoder
322 struct imx_drm_device *imxdrm = __imx_drm_device();
324 drm_encoder_cleanup(imx_drm_encoder->encoder);
326 drm_mode_group_reinit(imxdrm->drm);
330 * register a connector to the drm core
332 static int imx_drm_connector_register(
333 struct imx_drm_connector *imx_drm_connector)
335 struct imx_drm_device *imxdrm = __imx_drm_device();
337 drm_connector_init(imxdrm->drm, imx_drm_connector->connector,
338 imx_drm_connector->connector->funcs,
339 imx_drm_connector->connector->connector_type);
340 drm_mode_group_reinit(imxdrm->drm);
342 return drm_sysfs_connector_add(imx_drm_connector->connector);
346 * unregister a connector from the drm core
348 static void imx_drm_connector_unregister(
349 struct imx_drm_connector *imx_drm_connector)
351 struct imx_drm_device *imxdrm = __imx_drm_device();
353 drm_sysfs_connector_remove(imx_drm_connector->connector);
354 drm_connector_cleanup(imx_drm_connector->connector);
356 drm_mode_group_reinit(imxdrm->drm);
360 * register a crtc to the drm core
362 static int imx_drm_crtc_register(struct imx_drm_crtc *imx_drm_crtc)
364 struct imx_drm_device *imxdrm = __imx_drm_device();
367 drm_crtc_init(imxdrm->drm, imx_drm_crtc->crtc,
368 imx_drm_crtc->imx_drm_helper_funcs.crtc_funcs);
369 ret = drm_mode_crtc_set_gamma_size(imx_drm_crtc->crtc, 256);
373 drm_crtc_helper_add(imx_drm_crtc->crtc,
374 imx_drm_crtc->imx_drm_helper_funcs.crtc_helper_funcs);
376 drm_mode_group_reinit(imxdrm->drm);
382 * Called by the CRTC driver when all CRTCs are registered. This
383 * puts all the pieces together and initializes the driver.
384 * Once this is called no more CRTCs can be registered since
385 * the drm core has hardcoded the number of crtcs in several
388 static int imx_drm_driver_load(struct drm_device *drm, unsigned long flags)
390 struct imx_drm_device *imxdrm = __imx_drm_device();
395 drm->dev_private = imxdrm;
398 * enable drm irq mode.
399 * - with irq_enabled = 1, we can use the vblank feature.
401 * P.S. note that we wouldn't use drm irq handler but
402 * just specific driver own one instead because
403 * drm framework supports only one irq handler and
404 * drivers can well take care of their interrupts
406 drm->irq_enabled = 1;
408 drm_mode_config_init(drm);
409 imx_drm_mode_config_init(drm);
411 mutex_lock(&imxdrm->mutex);
413 drm_kms_helper_poll_init(imxdrm->drm);
415 /* setup the grouping for the legacy output */
416 ret = drm_mode_group_init_legacy_group(imxdrm->drm,
417 &imxdrm->drm->primary->mode_group);
421 ret = drm_vblank_init(imxdrm->drm, MAX_CRTC);
426 * with vblank_disable_allowed = 1, vblank interrupt will be disabled
427 * by drm timer once a current process gives up ownership of
428 * vblank event.(after drm_vblank_put function is called)
430 imxdrm->drm->vblank_disable_allowed = 1;
432 if (!imx_drm_device_get())
438 mutex_unlock(&imxdrm->mutex);
443 static void imx_drm_update_possible_crtcs(void)
445 struct imx_drm_device *imxdrm = __imx_drm_device();
446 struct imx_drm_crtc *imx_drm_crtc;
447 struct imx_drm_encoder *enc;
448 struct crtc_cookie *cookie;
450 list_for_each_entry(enc, &imxdrm->encoder_list, list) {
451 u32 possible_crtcs = 0;
453 list_for_each_entry(cookie, &enc->possible_crtcs, list) {
454 list_for_each_entry(imx_drm_crtc, &imxdrm->crtc_list, list) {
455 if (imx_drm_crtc->cookie.cookie == cookie->cookie &&
456 imx_drm_crtc->cookie.id == cookie->id) {
457 possible_crtcs |= 1 << imx_drm_crtc->pipe;
461 enc->encoder->possible_crtcs = possible_crtcs;
462 enc->encoder->possible_clones = possible_crtcs;
467 * imx_drm_add_crtc - add a new crtc
469 * The return value if !NULL is a cookie for the caller to pass to
470 * imx_drm_remove_crtc later.
472 int imx_drm_add_crtc(struct drm_crtc *crtc,
473 struct imx_drm_crtc **new_crtc,
474 const struct imx_drm_crtc_helper_funcs *imx_drm_helper_funcs,
475 struct module *owner, void *cookie, int id)
477 struct imx_drm_device *imxdrm = __imx_drm_device();
478 struct imx_drm_crtc *imx_drm_crtc;
481 mutex_lock(&imxdrm->mutex);
483 if (imxdrm->drm->open_count) {
488 imx_drm_crtc = kzalloc(sizeof(*imx_drm_crtc), GFP_KERNEL);
494 imx_drm_crtc->imx_drm_helper_funcs = *imx_drm_helper_funcs;
495 imx_drm_crtc->pipe = imxdrm->pipes++;
496 imx_drm_crtc->cookie.cookie = cookie;
497 imx_drm_crtc->cookie.id = id;
499 imx_drm_crtc->crtc = crtc;
500 imx_drm_crtc->imxdrm = imxdrm;
502 imx_drm_crtc->owner = owner;
504 list_add_tail(&imx_drm_crtc->list, &imxdrm->crtc_list);
506 *new_crtc = imx_drm_crtc;
508 ret = imx_drm_crtc_register(imx_drm_crtc);
512 imx_drm_update_possible_crtcs();
514 mutex_unlock(&imxdrm->mutex);
522 mutex_unlock(&imxdrm->mutex);
525 EXPORT_SYMBOL_GPL(imx_drm_add_crtc);
528 * imx_drm_remove_crtc - remove a crtc
530 int imx_drm_remove_crtc(struct imx_drm_crtc *imx_drm_crtc)
532 struct imx_drm_device *imxdrm = imx_drm_crtc->imxdrm;
534 mutex_lock(&imxdrm->mutex);
536 drm_crtc_cleanup(imx_drm_crtc->crtc);
538 list_del(&imx_drm_crtc->list);
540 drm_mode_group_reinit(imxdrm->drm);
542 mutex_unlock(&imxdrm->mutex);
548 EXPORT_SYMBOL_GPL(imx_drm_remove_crtc);
551 * imx_drm_add_encoder - add a new encoder
553 int imx_drm_add_encoder(struct drm_encoder *encoder,
554 struct imx_drm_encoder **newenc, struct module *owner)
556 struct imx_drm_device *imxdrm = __imx_drm_device();
557 struct imx_drm_encoder *imx_drm_encoder;
560 mutex_lock(&imxdrm->mutex);
562 if (imxdrm->drm->open_count) {
567 imx_drm_encoder = kzalloc(sizeof(*imx_drm_encoder), GFP_KERNEL);
568 if (!imx_drm_encoder) {
573 imx_drm_encoder->encoder = encoder;
574 imx_drm_encoder->owner = owner;
576 ret = imx_drm_encoder_register(imx_drm_encoder);
582 list_add_tail(&imx_drm_encoder->list, &imxdrm->encoder_list);
584 *newenc = imx_drm_encoder;
586 mutex_unlock(&imxdrm->mutex);
591 kfree(imx_drm_encoder);
594 mutex_unlock(&imxdrm->mutex);
598 EXPORT_SYMBOL_GPL(imx_drm_add_encoder);
600 int imx_drm_encoder_add_possible_crtcs(
601 struct imx_drm_encoder *imx_drm_encoder,
602 struct device_node *np)
604 struct imx_drm_device *imxdrm = __imx_drm_device();
605 struct of_phandle_args args;
606 struct crtc_cookie *c;
610 if (!list_empty(&imx_drm_encoder->possible_crtcs))
613 for (i = 0; !ret; i++) {
614 ret = of_parse_phandle_with_args(np, "crtcs",
615 "#crtc-cells", i, &args);
619 c = kzalloc(sizeof(*c), GFP_KERNEL);
621 of_node_put(args.np);
626 c->id = args.args_count > 0 ? args.args[0] : 0;
628 of_node_put(args.np);
630 mutex_lock(&imxdrm->mutex);
632 list_add_tail(&c->list, &imx_drm_encoder->possible_crtcs);
634 mutex_unlock(&imxdrm->mutex);
637 imx_drm_update_possible_crtcs();
641 EXPORT_SYMBOL_GPL(imx_drm_encoder_add_possible_crtcs);
643 int imx_drm_encoder_get_mux_id(struct imx_drm_encoder *imx_drm_encoder,
644 struct drm_crtc *crtc)
646 struct imx_drm_device *imxdrm = __imx_drm_device();
647 struct imx_drm_crtc *imx_crtc;
650 mutex_lock(&imxdrm->mutex);
652 list_for_each_entry(imx_crtc, &imxdrm->crtc_list, list) {
653 if (imx_crtc->crtc == crtc)
658 mutex_unlock(&imxdrm->mutex);
662 mutex_unlock(&imxdrm->mutex);
666 EXPORT_SYMBOL_GPL(imx_drm_encoder_get_mux_id);
669 * imx_drm_remove_encoder - remove an encoder
671 int imx_drm_remove_encoder(struct imx_drm_encoder *imx_drm_encoder)
673 struct imx_drm_device *imxdrm = __imx_drm_device();
674 struct crtc_cookie *c, *tmp;
676 mutex_lock(&imxdrm->mutex);
678 imx_drm_encoder_unregister(imx_drm_encoder);
680 list_del(&imx_drm_encoder->list);
682 list_for_each_entry_safe(c, tmp, &imx_drm_encoder->possible_crtcs,
686 mutex_unlock(&imxdrm->mutex);
688 kfree(imx_drm_encoder);
692 EXPORT_SYMBOL_GPL(imx_drm_remove_encoder);
695 * imx_drm_add_connector - add a connector
697 int imx_drm_add_connector(struct drm_connector *connector,
698 struct imx_drm_connector **new_con,
699 struct module *owner)
701 struct imx_drm_device *imxdrm = __imx_drm_device();
702 struct imx_drm_connector *imx_drm_connector;
705 mutex_lock(&imxdrm->mutex);
707 if (imxdrm->drm->open_count) {
712 imx_drm_connector = kzalloc(sizeof(*imx_drm_connector), GFP_KERNEL);
713 if (!imx_drm_connector) {
718 imx_drm_connector->connector = connector;
719 imx_drm_connector->owner = owner;
721 ret = imx_drm_connector_register(imx_drm_connector);
725 list_add_tail(&imx_drm_connector->list, &imxdrm->connector_list);
727 *new_con = imx_drm_connector;
729 mutex_unlock(&imxdrm->mutex);
734 kfree(imx_drm_connector);
737 mutex_unlock(&imxdrm->mutex);
741 EXPORT_SYMBOL_GPL(imx_drm_add_connector);
743 void imx_drm_fb_helper_set(struct drm_fbdev_cma *fbdev_helper)
745 struct imx_drm_device *imxdrm = __imx_drm_device();
747 imxdrm->fbhelper = fbdev_helper;
749 EXPORT_SYMBOL_GPL(imx_drm_fb_helper_set);
752 * imx_drm_remove_connector - remove a connector
754 int imx_drm_remove_connector(struct imx_drm_connector *imx_drm_connector)
756 struct imx_drm_device *imxdrm = __imx_drm_device();
758 mutex_lock(&imxdrm->mutex);
760 imx_drm_connector_unregister(imx_drm_connector);
762 list_del(&imx_drm_connector->list);
764 mutex_unlock(&imxdrm->mutex);
766 kfree(imx_drm_connector);
770 EXPORT_SYMBOL_GPL(imx_drm_remove_connector);
772 static const struct drm_ioctl_desc imx_drm_ioctls[] = {
776 static struct drm_driver imx_drm_driver = {
777 .driver_features = DRIVER_MODESET | DRIVER_GEM,
778 .load = imx_drm_driver_load,
779 .unload = imx_drm_driver_unload,
780 .lastclose = imx_drm_driver_lastclose,
781 .gem_free_object = drm_gem_cma_free_object,
782 .gem_vm_ops = &drm_gem_cma_vm_ops,
783 .dumb_create = drm_gem_cma_dumb_create,
784 .dumb_map_offset = drm_gem_cma_dumb_map_offset,
785 .dumb_destroy = drm_gem_dumb_destroy,
787 .get_vblank_counter = drm_vblank_count,
788 .enable_vblank = imx_drm_enable_vblank,
789 .disable_vblank = imx_drm_disable_vblank,
790 .ioctls = imx_drm_ioctls,
791 .num_ioctls = ARRAY_SIZE(imx_drm_ioctls),
792 .fops = &imx_drm_driver_fops,
794 .desc = "i.MX DRM graphics",
801 static int imx_drm_platform_probe(struct platform_device *pdev)
803 imx_drm_device->dev = &pdev->dev;
805 return drm_platform_init(&imx_drm_driver, pdev);
808 static int imx_drm_platform_remove(struct platform_device *pdev)
810 drm_platform_exit(&imx_drm_driver, pdev);
815 static struct platform_driver imx_drm_pdrv = {
816 .probe = imx_drm_platform_probe,
817 .remove = imx_drm_platform_remove,
819 .owner = THIS_MODULE,
824 static struct platform_device *imx_drm_pdev;
826 static int __init imx_drm_init(void)
830 imx_drm_device = kzalloc(sizeof(*imx_drm_device), GFP_KERNEL);
834 mutex_init(&imx_drm_device->mutex);
835 INIT_LIST_HEAD(&imx_drm_device->crtc_list);
836 INIT_LIST_HEAD(&imx_drm_device->connector_list);
837 INIT_LIST_HEAD(&imx_drm_device->encoder_list);
839 imx_drm_pdev = platform_device_register_simple("imx-drm", -1, NULL, 0);
845 imx_drm_pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32),
847 ret = platform_driver_register(&imx_drm_pdrv);
854 platform_device_unregister(imx_drm_pdev);
856 kfree(imx_drm_device);
861 static void __exit imx_drm_exit(void)
863 platform_device_unregister(imx_drm_pdev);
864 platform_driver_unregister(&imx_drm_pdrv);
866 kfree(imx_drm_device);
869 module_init(imx_drm_init);
870 module_exit(imx_drm_exit);
872 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
873 MODULE_DESCRIPTION("i.MX drm driver core");
874 MODULE_LICENSE("GPL");