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_pins(struct drm_crtc *crtc, u32 encoder_type,
116 u32 interface_pix_fmt, int hsync_pin, int vsync_pin)
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,
138 hsync_pin, vsync_pin);
141 EXPORT_SYMBOL_GPL(imx_drm_crtc_panel_format_pins);
143 int imx_drm_crtc_panel_format(struct drm_crtc *crtc, u32 encoder_type,
144 u32 interface_pix_fmt)
146 return imx_drm_crtc_panel_format_pins(crtc, encoder_type,
147 interface_pix_fmt, 2, 3);
149 EXPORT_SYMBOL_GPL(imx_drm_crtc_panel_format);
151 int imx_drm_crtc_vblank_get(struct imx_drm_crtc *imx_drm_crtc)
153 return drm_vblank_get(imx_drm_crtc->imxdrm->drm, imx_drm_crtc->pipe);
155 EXPORT_SYMBOL_GPL(imx_drm_crtc_vblank_get);
157 void imx_drm_crtc_vblank_put(struct imx_drm_crtc *imx_drm_crtc)
159 drm_vblank_put(imx_drm_crtc->imxdrm->drm, imx_drm_crtc->pipe);
161 EXPORT_SYMBOL_GPL(imx_drm_crtc_vblank_put);
163 void imx_drm_handle_vblank(struct imx_drm_crtc *imx_drm_crtc)
165 drm_handle_vblank(imx_drm_crtc->imxdrm->drm, imx_drm_crtc->pipe);
167 EXPORT_SYMBOL_GPL(imx_drm_handle_vblank);
169 static int imx_drm_enable_vblank(struct drm_device *drm, int crtc)
171 struct imx_drm_device *imxdrm = drm->dev_private;
172 struct imx_drm_crtc *imx_drm_crtc;
175 imx_drm_crtc = imx_drm_crtc_by_num(imxdrm, crtc);
179 if (!imx_drm_crtc->imx_drm_helper_funcs.enable_vblank)
182 ret = imx_drm_crtc->imx_drm_helper_funcs.enable_vblank(
188 static void imx_drm_disable_vblank(struct drm_device *drm, int crtc)
190 struct imx_drm_device *imxdrm = drm->dev_private;
191 struct imx_drm_crtc *imx_drm_crtc;
193 imx_drm_crtc = imx_drm_crtc_by_num(imxdrm, crtc);
197 if (!imx_drm_crtc->imx_drm_helper_funcs.disable_vblank)
200 imx_drm_crtc->imx_drm_helper_funcs.disable_vblank(imx_drm_crtc->crtc);
203 static const struct file_operations imx_drm_driver_fops = {
204 .owner = THIS_MODULE,
206 .release = drm_release,
207 .unlocked_ioctl = drm_ioctl,
208 .mmap = drm_gem_cma_mmap,
210 .fasync = drm_fasync,
212 .llseek = noop_llseek,
215 static struct imx_drm_device *imx_drm_device;
217 static struct imx_drm_device *__imx_drm_device(void)
219 return imx_drm_device;
222 struct drm_device *imx_drm_device_get(void)
224 struct imx_drm_device *imxdrm = __imx_drm_device();
225 struct imx_drm_encoder *enc;
226 struct imx_drm_connector *con;
227 struct imx_drm_crtc *crtc;
229 mutex_lock(&imxdrm->mutex);
231 list_for_each_entry(enc, &imxdrm->encoder_list, list) {
232 if (!try_module_get(enc->owner)) {
233 dev_err(imxdrm->dev, "could not get module %s\n",
234 module_name(enc->owner));
239 list_for_each_entry(con, &imxdrm->connector_list, list) {
240 if (!try_module_get(con->owner)) {
241 dev_err(imxdrm->dev, "could not get module %s\n",
242 module_name(con->owner));
247 list_for_each_entry(crtc, &imxdrm->crtc_list, list) {
248 if (!try_module_get(crtc->owner)) {
249 dev_err(imxdrm->dev, "could not get module %s\n",
250 module_name(crtc->owner));
255 imxdrm->references++;
257 mutex_unlock(&imxdrm->mutex);
262 list_for_each_entry_continue_reverse(crtc, &imxdrm->crtc_list, list)
263 module_put(crtc->owner);
265 list_for_each_entry_continue_reverse(con, &imxdrm->connector_list, list)
266 module_put(con->owner);
268 list_for_each_entry_continue_reverse(enc, &imxdrm->encoder_list, list)
269 module_put(enc->owner);
271 mutex_unlock(&imxdrm->mutex);
276 EXPORT_SYMBOL_GPL(imx_drm_device_get);
278 void imx_drm_device_put(void)
280 struct imx_drm_device *imxdrm = __imx_drm_device();
281 struct imx_drm_encoder *enc;
282 struct imx_drm_connector *con;
283 struct imx_drm_crtc *crtc;
285 mutex_lock(&imxdrm->mutex);
287 list_for_each_entry(crtc, &imxdrm->crtc_list, list)
288 module_put(crtc->owner);
290 list_for_each_entry(con, &imxdrm->connector_list, list)
291 module_put(con->owner);
293 list_for_each_entry(enc, &imxdrm->encoder_list, list)
294 module_put(enc->owner);
296 imxdrm->references--;
298 mutex_unlock(&imxdrm->mutex);
300 EXPORT_SYMBOL_GPL(imx_drm_device_put);
302 static int drm_mode_group_reinit(struct drm_device *dev)
304 struct drm_mode_group *group = &dev->primary->mode_group;
305 uint32_t *id_list = group->id_list;
308 ret = drm_mode_group_init_legacy_group(dev, group);
317 * register an encoder to the drm core
319 static int imx_drm_encoder_register(struct imx_drm_encoder *imx_drm_encoder)
321 struct imx_drm_device *imxdrm = __imx_drm_device();
323 INIT_LIST_HEAD(&imx_drm_encoder->possible_crtcs);
325 drm_encoder_init(imxdrm->drm, imx_drm_encoder->encoder,
326 imx_drm_encoder->encoder->funcs,
327 imx_drm_encoder->encoder->encoder_type);
329 drm_mode_group_reinit(imxdrm->drm);
335 * unregister an encoder from the drm core
337 static void imx_drm_encoder_unregister(struct imx_drm_encoder
340 struct imx_drm_device *imxdrm = __imx_drm_device();
342 drm_encoder_cleanup(imx_drm_encoder->encoder);
344 drm_mode_group_reinit(imxdrm->drm);
348 * register a connector to the drm core
350 static int imx_drm_connector_register(
351 struct imx_drm_connector *imx_drm_connector)
353 struct imx_drm_device *imxdrm = __imx_drm_device();
355 drm_connector_init(imxdrm->drm, imx_drm_connector->connector,
356 imx_drm_connector->connector->funcs,
357 imx_drm_connector->connector->connector_type);
358 drm_mode_group_reinit(imxdrm->drm);
360 return drm_sysfs_connector_add(imx_drm_connector->connector);
364 * unregister a connector from the drm core
366 static void imx_drm_connector_unregister(
367 struct imx_drm_connector *imx_drm_connector)
369 struct imx_drm_device *imxdrm = __imx_drm_device();
371 drm_sysfs_connector_remove(imx_drm_connector->connector);
372 drm_connector_cleanup(imx_drm_connector->connector);
374 drm_mode_group_reinit(imxdrm->drm);
378 * register a crtc to the drm core
380 static int imx_drm_crtc_register(struct imx_drm_crtc *imx_drm_crtc)
382 struct imx_drm_device *imxdrm = __imx_drm_device();
385 drm_crtc_init(imxdrm->drm, imx_drm_crtc->crtc,
386 imx_drm_crtc->imx_drm_helper_funcs.crtc_funcs);
387 ret = drm_mode_crtc_set_gamma_size(imx_drm_crtc->crtc, 256);
391 drm_crtc_helper_add(imx_drm_crtc->crtc,
392 imx_drm_crtc->imx_drm_helper_funcs.crtc_helper_funcs);
394 drm_mode_group_reinit(imxdrm->drm);
400 * Called by the CRTC driver when all CRTCs are registered. This
401 * puts all the pieces together and initializes the driver.
402 * Once this is called no more CRTCs can be registered since
403 * the drm core has hardcoded the number of crtcs in several
406 static int imx_drm_driver_load(struct drm_device *drm, unsigned long flags)
408 struct imx_drm_device *imxdrm = __imx_drm_device();
413 drm->dev_private = imxdrm;
416 * enable drm irq mode.
417 * - with irq_enabled = 1, we can use the vblank feature.
419 * P.S. note that we wouldn't use drm irq handler but
420 * just specific driver own one instead because
421 * drm framework supports only one irq handler and
422 * drivers can well take care of their interrupts
424 drm->irq_enabled = 1;
426 drm_mode_config_init(drm);
427 imx_drm_mode_config_init(drm);
429 mutex_lock(&imxdrm->mutex);
431 drm_kms_helper_poll_init(imxdrm->drm);
433 /* setup the grouping for the legacy output */
434 ret = drm_mode_group_init_legacy_group(imxdrm->drm,
435 &imxdrm->drm->primary->mode_group);
439 ret = drm_vblank_init(imxdrm->drm, MAX_CRTC);
444 * with vblank_disable_allowed = 1, vblank interrupt will be disabled
445 * by drm timer once a current process gives up ownership of
446 * vblank event.(after drm_vblank_put function is called)
448 imxdrm->drm->vblank_disable_allowed = 1;
453 mutex_unlock(&imxdrm->mutex);
458 static void imx_drm_update_possible_crtcs(void)
460 struct imx_drm_device *imxdrm = __imx_drm_device();
461 struct imx_drm_crtc *imx_drm_crtc;
462 struct imx_drm_encoder *enc;
463 struct crtc_cookie *cookie;
465 list_for_each_entry(enc, &imxdrm->encoder_list, list) {
466 u32 possible_crtcs = 0;
468 list_for_each_entry(cookie, &enc->possible_crtcs, list) {
469 list_for_each_entry(imx_drm_crtc, &imxdrm->crtc_list, list) {
470 if (imx_drm_crtc->cookie.cookie == cookie->cookie &&
471 imx_drm_crtc->cookie.id == cookie->id) {
472 possible_crtcs |= 1 << imx_drm_crtc->pipe;
476 enc->encoder->possible_crtcs = possible_crtcs;
477 enc->encoder->possible_clones = possible_crtcs;
482 * imx_drm_add_crtc - add a new crtc
484 * The return value if !NULL is a cookie for the caller to pass to
485 * imx_drm_remove_crtc later.
487 int imx_drm_add_crtc(struct drm_crtc *crtc,
488 struct imx_drm_crtc **new_crtc,
489 const struct imx_drm_crtc_helper_funcs *imx_drm_helper_funcs,
490 struct module *owner, void *cookie, int id)
492 struct imx_drm_device *imxdrm = __imx_drm_device();
493 struct imx_drm_crtc *imx_drm_crtc;
494 const struct drm_crtc_funcs *crtc_funcs;
497 mutex_lock(&imxdrm->mutex);
499 if (imxdrm->references) {
504 imx_drm_crtc = kzalloc(sizeof(*imx_drm_crtc), GFP_KERNEL);
510 imx_drm_crtc->imx_drm_helper_funcs = *imx_drm_helper_funcs;
511 imx_drm_crtc->pipe = imxdrm->pipes++;
512 imx_drm_crtc->cookie.cookie = cookie;
513 imx_drm_crtc->cookie.id = id;
515 crtc_funcs = imx_drm_helper_funcs->crtc_funcs;
517 imx_drm_crtc->crtc = crtc;
518 imx_drm_crtc->imxdrm = imxdrm;
520 imx_drm_crtc->owner = owner;
522 list_add_tail(&imx_drm_crtc->list, &imxdrm->crtc_list);
524 *new_crtc = imx_drm_crtc;
526 ret = imx_drm_crtc_register(imx_drm_crtc);
530 imx_drm_update_possible_crtcs();
532 mutex_unlock(&imxdrm->mutex);
540 mutex_unlock(&imxdrm->mutex);
543 EXPORT_SYMBOL_GPL(imx_drm_add_crtc);
546 * imx_drm_remove_crtc - remove a crtc
548 int imx_drm_remove_crtc(struct imx_drm_crtc *imx_drm_crtc)
550 struct imx_drm_device *imxdrm = imx_drm_crtc->imxdrm;
552 mutex_lock(&imxdrm->mutex);
554 drm_crtc_cleanup(imx_drm_crtc->crtc);
556 list_del(&imx_drm_crtc->list);
558 drm_mode_group_reinit(imxdrm->drm);
560 mutex_unlock(&imxdrm->mutex);
566 EXPORT_SYMBOL_GPL(imx_drm_remove_crtc);
569 * imx_drm_add_encoder - add a new encoder
571 int imx_drm_add_encoder(struct drm_encoder *encoder,
572 struct imx_drm_encoder **newenc, struct module *owner)
574 struct imx_drm_device *imxdrm = __imx_drm_device();
575 struct imx_drm_encoder *imx_drm_encoder;
578 mutex_lock(&imxdrm->mutex);
580 if (imxdrm->references) {
585 imx_drm_encoder = kzalloc(sizeof(*imx_drm_encoder), GFP_KERNEL);
586 if (!imx_drm_encoder) {
591 imx_drm_encoder->encoder = encoder;
592 imx_drm_encoder->owner = owner;
594 ret = imx_drm_encoder_register(imx_drm_encoder);
600 list_add_tail(&imx_drm_encoder->list, &imxdrm->encoder_list);
602 *newenc = imx_drm_encoder;
604 mutex_unlock(&imxdrm->mutex);
609 kfree(imx_drm_encoder);
612 mutex_unlock(&imxdrm->mutex);
616 EXPORT_SYMBOL_GPL(imx_drm_add_encoder);
618 int imx_drm_encoder_add_possible_crtcs(
619 struct imx_drm_encoder *imx_drm_encoder,
620 struct device_node *np)
622 struct imx_drm_device *imxdrm = __imx_drm_device();
623 struct of_phandle_args args;
624 struct crtc_cookie *c;
628 if (!list_empty(&imx_drm_encoder->possible_crtcs))
631 for (i = 0; !ret; i++) {
632 ret = of_parse_phandle_with_args(np, "crtcs",
633 "#crtc-cells", i, &args);
637 c = kzalloc(sizeof(*c), GFP_KERNEL);
639 of_node_put(args.np);
644 c->id = args.args_count > 0 ? args.args[0] : 0;
646 of_node_put(args.np);
648 mutex_lock(&imxdrm->mutex);
650 list_add_tail(&c->list, &imx_drm_encoder->possible_crtcs);
652 mutex_unlock(&imxdrm->mutex);
655 imx_drm_update_possible_crtcs();
659 EXPORT_SYMBOL_GPL(imx_drm_encoder_add_possible_crtcs);
661 int imx_drm_encoder_get_mux_id(struct imx_drm_encoder *imx_drm_encoder,
662 struct drm_crtc *crtc)
664 struct imx_drm_device *imxdrm = __imx_drm_device();
665 struct imx_drm_crtc *imx_crtc;
668 mutex_lock(&imxdrm->mutex);
670 list_for_each_entry(imx_crtc, &imxdrm->crtc_list, list) {
671 if (imx_crtc->crtc == crtc)
676 mutex_unlock(&imxdrm->mutex);
680 mutex_unlock(&imxdrm->mutex);
686 * imx_drm_remove_encoder - remove an encoder
688 int imx_drm_remove_encoder(struct imx_drm_encoder *imx_drm_encoder)
690 struct imx_drm_device *imxdrm = __imx_drm_device();
691 struct crtc_cookie *c, *tmp;
693 mutex_lock(&imxdrm->mutex);
695 imx_drm_encoder_unregister(imx_drm_encoder);
697 list_del(&imx_drm_encoder->list);
699 list_for_each_entry_safe(c, tmp, &imx_drm_encoder->possible_crtcs,
703 mutex_unlock(&imxdrm->mutex);
705 kfree(imx_drm_encoder);
709 EXPORT_SYMBOL_GPL(imx_drm_remove_encoder);
712 * imx_drm_add_connector - add a connector
714 int imx_drm_add_connector(struct drm_connector *connector,
715 struct imx_drm_connector **new_con,
716 struct module *owner)
718 struct imx_drm_device *imxdrm = __imx_drm_device();
719 struct imx_drm_connector *imx_drm_connector;
722 mutex_lock(&imxdrm->mutex);
724 if (imxdrm->references) {
729 imx_drm_connector = kzalloc(sizeof(*imx_drm_connector), GFP_KERNEL);
730 if (!imx_drm_connector) {
735 imx_drm_connector->connector = connector;
736 imx_drm_connector->owner = owner;
738 ret = imx_drm_connector_register(imx_drm_connector);
742 list_add_tail(&imx_drm_connector->list, &imxdrm->connector_list);
744 *new_con = imx_drm_connector;
746 mutex_unlock(&imxdrm->mutex);
751 kfree(imx_drm_connector);
754 mutex_unlock(&imxdrm->mutex);
758 EXPORT_SYMBOL_GPL(imx_drm_add_connector);
760 void imx_drm_fb_helper_set(struct drm_fbdev_cma *fbdev_helper)
762 struct imx_drm_device *imxdrm = __imx_drm_device();
764 imxdrm->fbhelper = fbdev_helper;
766 EXPORT_SYMBOL_GPL(imx_drm_fb_helper_set);
769 * imx_drm_remove_connector - remove a connector
771 int imx_drm_remove_connector(struct imx_drm_connector *imx_drm_connector)
773 struct imx_drm_device *imxdrm = __imx_drm_device();
775 mutex_lock(&imxdrm->mutex);
777 imx_drm_connector_unregister(imx_drm_connector);
779 list_del(&imx_drm_connector->list);
781 mutex_unlock(&imxdrm->mutex);
783 kfree(imx_drm_connector);
787 EXPORT_SYMBOL_GPL(imx_drm_remove_connector);
789 static struct drm_ioctl_desc imx_drm_ioctls[] = {
793 static struct drm_driver imx_drm_driver = {
794 .driver_features = DRIVER_MODESET | DRIVER_GEM,
795 .load = imx_drm_driver_load,
796 .unload = imx_drm_driver_unload,
797 .firstopen = imx_drm_driver_firstopen,
798 .lastclose = imx_drm_driver_lastclose,
799 .gem_free_object = drm_gem_cma_free_object,
800 .gem_vm_ops = &drm_gem_cma_vm_ops,
801 .dumb_create = drm_gem_cma_dumb_create,
802 .dumb_map_offset = drm_gem_cma_dumb_map_offset,
803 .dumb_destroy = drm_gem_cma_dumb_destroy,
805 .get_vblank_counter = drm_vblank_count,
806 .enable_vblank = imx_drm_enable_vblank,
807 .disable_vblank = imx_drm_disable_vblank,
808 .ioctls = imx_drm_ioctls,
809 .num_ioctls = ARRAY_SIZE(imx_drm_ioctls),
810 .fops = &imx_drm_driver_fops,
812 .desc = "i.MX DRM graphics",
819 static int imx_drm_platform_probe(struct platform_device *pdev)
821 imx_drm_device->dev = &pdev->dev;
823 return drm_platform_init(&imx_drm_driver, pdev);
826 static int imx_drm_platform_remove(struct platform_device *pdev)
828 drm_platform_exit(&imx_drm_driver, pdev);
833 static struct platform_driver imx_drm_pdrv = {
834 .probe = imx_drm_platform_probe,
835 .remove = imx_drm_platform_remove,
837 .owner = THIS_MODULE,
842 static struct platform_device *imx_drm_pdev;
844 static int __init imx_drm_init(void)
848 imx_drm_device = kzalloc(sizeof(*imx_drm_device), GFP_KERNEL);
852 mutex_init(&imx_drm_device->mutex);
853 INIT_LIST_HEAD(&imx_drm_device->crtc_list);
854 INIT_LIST_HEAD(&imx_drm_device->connector_list);
855 INIT_LIST_HEAD(&imx_drm_device->encoder_list);
857 imx_drm_pdev = platform_device_register_simple("imx-drm", -1, NULL, 0);
863 imx_drm_pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32),
865 ret = platform_driver_register(&imx_drm_pdrv);
872 platform_device_unregister(imx_drm_pdev);
874 kfree(imx_drm_device);
879 static void __exit imx_drm_exit(void)
881 platform_device_unregister(imx_drm_pdev);
882 platform_driver_unregister(&imx_drm_pdrv);
884 kfree(imx_drm_device);
887 module_init(imx_drm_init);
888 module_exit(imx_drm_exit);
890 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
891 MODULE_DESCRIPTION("i.MX drm driver core");
892 MODULE_LICENSE("GPL");