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 int imx_drm_crtc_id(struct imx_drm_crtc *crtc)
75 EXPORT_SYMBOL_GPL(imx_drm_crtc_id);
77 static void imx_drm_driver_lastclose(struct drm_device *drm)
79 struct imx_drm_device *imxdrm = drm->dev_private;
82 drm_fbdev_cma_restore_mode(imxdrm->fbhelper);
85 static int imx_drm_driver_unload(struct drm_device *drm)
87 struct imx_drm_device *imxdrm = drm->dev_private;
91 drm_mode_config_cleanup(imxdrm->drm);
92 drm_kms_helper_poll_fini(imxdrm->drm);
98 * We don't care at all for crtc numbers, but the core expects the
99 * crtcs to be numbered
101 static struct imx_drm_crtc *imx_drm_crtc_by_num(struct imx_drm_device *imxdrm,
104 struct imx_drm_crtc *imx_drm_crtc;
106 list_for_each_entry(imx_drm_crtc, &imxdrm->crtc_list, list)
107 if (imx_drm_crtc->pipe == num)
112 int imx_drm_crtc_panel_format_pins(struct drm_crtc *crtc, u32 encoder_type,
113 u32 interface_pix_fmt, int hsync_pin, int vsync_pin)
115 struct imx_drm_device *imxdrm = crtc->dev->dev_private;
116 struct imx_drm_crtc *imx_crtc;
117 struct imx_drm_crtc_helper_funcs *helper;
119 list_for_each_entry(imx_crtc, &imxdrm->crtc_list, list)
120 if (imx_crtc->crtc == crtc)
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 void imx_drm_driver_preclose(struct drm_device *drm,
195 struct drm_file *file)
199 if (!file->is_master)
202 for (i = 0; i < 4; i++)
203 imx_drm_disable_vblank(drm , i);
206 static const struct file_operations imx_drm_driver_fops = {
207 .owner = THIS_MODULE,
209 .release = drm_release,
210 .unlocked_ioctl = drm_ioctl,
211 .mmap = drm_gem_cma_mmap,
214 .llseek = noop_llseek,
217 static struct imx_drm_device *imx_drm_device;
219 static struct imx_drm_device *__imx_drm_device(void)
221 return imx_drm_device;
224 struct drm_device *imx_drm_device_get(void)
226 struct imx_drm_device *imxdrm = __imx_drm_device();
227 struct imx_drm_encoder *enc;
228 struct imx_drm_connector *con;
229 struct imx_drm_crtc *crtc;
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));
258 list_for_each_entry_continue_reverse(crtc, &imxdrm->crtc_list, list)
259 module_put(crtc->owner);
261 list_for_each_entry_continue_reverse(con, &imxdrm->connector_list, list)
262 module_put(con->owner);
264 list_for_each_entry_continue_reverse(enc, &imxdrm->encoder_list, list)
265 module_put(enc->owner);
267 mutex_unlock(&imxdrm->mutex);
272 EXPORT_SYMBOL_GPL(imx_drm_device_get);
274 void imx_drm_device_put(void)
276 struct imx_drm_device *imxdrm = __imx_drm_device();
277 struct imx_drm_encoder *enc;
278 struct imx_drm_connector *con;
279 struct imx_drm_crtc *crtc;
281 mutex_lock(&imxdrm->mutex);
283 list_for_each_entry(crtc, &imxdrm->crtc_list, list)
284 module_put(crtc->owner);
286 list_for_each_entry(con, &imxdrm->connector_list, list)
287 module_put(con->owner);
289 list_for_each_entry(enc, &imxdrm->encoder_list, list)
290 module_put(enc->owner);
292 mutex_unlock(&imxdrm->mutex);
294 EXPORT_SYMBOL_GPL(imx_drm_device_put);
296 static int drm_mode_group_reinit(struct drm_device *dev)
298 struct drm_mode_group *group = &dev->primary->mode_group;
299 uint32_t *id_list = group->id_list;
302 ret = drm_mode_group_init_legacy_group(dev, group);
311 * register an encoder to the drm core
313 static int imx_drm_encoder_register(struct imx_drm_encoder *imx_drm_encoder)
315 struct imx_drm_device *imxdrm = __imx_drm_device();
317 INIT_LIST_HEAD(&imx_drm_encoder->possible_crtcs);
319 drm_encoder_init(imxdrm->drm, imx_drm_encoder->encoder,
320 imx_drm_encoder->encoder->funcs,
321 imx_drm_encoder->encoder->encoder_type);
323 drm_mode_group_reinit(imxdrm->drm);
329 * unregister an encoder from the drm core
331 static void imx_drm_encoder_unregister(struct imx_drm_encoder
334 struct imx_drm_device *imxdrm = __imx_drm_device();
336 drm_encoder_cleanup(imx_drm_encoder->encoder);
338 drm_mode_group_reinit(imxdrm->drm);
342 * register a connector to the drm core
344 static int imx_drm_connector_register(
345 struct imx_drm_connector *imx_drm_connector)
347 struct imx_drm_device *imxdrm = __imx_drm_device();
349 drm_connector_init(imxdrm->drm, imx_drm_connector->connector,
350 imx_drm_connector->connector->funcs,
351 imx_drm_connector->connector->connector_type);
352 drm_mode_group_reinit(imxdrm->drm);
354 return drm_sysfs_connector_add(imx_drm_connector->connector);
358 * unregister a connector from the drm core
360 static void imx_drm_connector_unregister(
361 struct imx_drm_connector *imx_drm_connector)
363 struct imx_drm_device *imxdrm = __imx_drm_device();
365 drm_sysfs_connector_remove(imx_drm_connector->connector);
366 drm_connector_cleanup(imx_drm_connector->connector);
368 drm_mode_group_reinit(imxdrm->drm);
372 * register a crtc to the drm core
374 static int imx_drm_crtc_register(struct imx_drm_crtc *imx_drm_crtc)
376 struct imx_drm_device *imxdrm = __imx_drm_device();
379 drm_crtc_init(imxdrm->drm, imx_drm_crtc->crtc,
380 imx_drm_crtc->imx_drm_helper_funcs.crtc_funcs);
381 ret = drm_mode_crtc_set_gamma_size(imx_drm_crtc->crtc, 256);
385 drm_crtc_helper_add(imx_drm_crtc->crtc,
386 imx_drm_crtc->imx_drm_helper_funcs.crtc_helper_funcs);
388 drm_mode_group_reinit(imxdrm->drm);
394 * Called by the CRTC driver when all CRTCs are registered. This
395 * puts all the pieces together and initializes the driver.
396 * Once this is called no more CRTCs can be registered since
397 * the drm core has hardcoded the number of crtcs in several
400 static int imx_drm_driver_load(struct drm_device *drm, unsigned long flags)
402 struct imx_drm_device *imxdrm = __imx_drm_device();
407 drm->dev_private = imxdrm;
410 * enable drm irq mode.
411 * - with irq_enabled = true, we can use the vblank feature.
413 * P.S. note that we wouldn't use drm irq handler but
414 * just specific driver own one instead because
415 * drm framework supports only one irq handler and
416 * drivers can well take care of their interrupts
418 drm->irq_enabled = true;
420 drm_mode_config_init(drm);
421 imx_drm_mode_config_init(drm);
423 mutex_lock(&imxdrm->mutex);
425 drm_kms_helper_poll_init(imxdrm->drm);
427 /* setup the grouping for the legacy output */
428 ret = drm_mode_group_init_legacy_group(imxdrm->drm,
429 &imxdrm->drm->primary->mode_group);
433 ret = drm_vblank_init(imxdrm->drm, MAX_CRTC);
438 * with vblank_disable_allowed = true, vblank interrupt will be disabled
439 * by drm timer once a current process gives up ownership of
440 * vblank event.(after drm_vblank_put function is called)
442 imxdrm->drm->vblank_disable_allowed = true;
444 if (!imx_drm_device_get())
450 mutex_unlock(&imxdrm->mutex);
455 static void imx_drm_update_possible_crtcs(void)
457 struct imx_drm_device *imxdrm = __imx_drm_device();
458 struct imx_drm_crtc *imx_drm_crtc;
459 struct imx_drm_encoder *enc;
460 struct crtc_cookie *cookie;
462 list_for_each_entry(enc, &imxdrm->encoder_list, list) {
463 u32 possible_crtcs = 0;
465 list_for_each_entry(cookie, &enc->possible_crtcs, list) {
466 list_for_each_entry(imx_drm_crtc, &imxdrm->crtc_list, list) {
467 if (imx_drm_crtc->cookie.cookie == cookie->cookie &&
468 imx_drm_crtc->cookie.id == cookie->id) {
469 possible_crtcs |= 1 << imx_drm_crtc->pipe;
473 enc->encoder->possible_crtcs = possible_crtcs;
474 enc->encoder->possible_clones = possible_crtcs;
479 * imx_drm_add_crtc - add a new crtc
481 * The return value if !NULL is a cookie for the caller to pass to
482 * imx_drm_remove_crtc later.
484 int imx_drm_add_crtc(struct drm_crtc *crtc,
485 struct imx_drm_crtc **new_crtc,
486 const struct imx_drm_crtc_helper_funcs *imx_drm_helper_funcs,
487 struct module *owner, void *cookie, int id)
489 struct imx_drm_device *imxdrm = __imx_drm_device();
490 struct imx_drm_crtc *imx_drm_crtc;
493 mutex_lock(&imxdrm->mutex);
495 if (imxdrm->drm->open_count) {
500 imx_drm_crtc = kzalloc(sizeof(*imx_drm_crtc), GFP_KERNEL);
506 imx_drm_crtc->imx_drm_helper_funcs = *imx_drm_helper_funcs;
507 imx_drm_crtc->pipe = imxdrm->pipes++;
508 imx_drm_crtc->cookie.cookie = cookie;
509 imx_drm_crtc->cookie.id = id;
511 imx_drm_crtc->crtc = crtc;
512 imx_drm_crtc->imxdrm = imxdrm;
514 imx_drm_crtc->owner = owner;
516 list_add_tail(&imx_drm_crtc->list, &imxdrm->crtc_list);
518 *new_crtc = imx_drm_crtc;
520 ret = imx_drm_crtc_register(imx_drm_crtc);
524 imx_drm_update_possible_crtcs();
526 mutex_unlock(&imxdrm->mutex);
534 mutex_unlock(&imxdrm->mutex);
537 EXPORT_SYMBOL_GPL(imx_drm_add_crtc);
540 * imx_drm_remove_crtc - remove a crtc
542 int imx_drm_remove_crtc(struct imx_drm_crtc *imx_drm_crtc)
544 struct imx_drm_device *imxdrm = imx_drm_crtc->imxdrm;
546 mutex_lock(&imxdrm->mutex);
548 drm_crtc_cleanup(imx_drm_crtc->crtc);
550 list_del(&imx_drm_crtc->list);
552 drm_mode_group_reinit(imxdrm->drm);
554 mutex_unlock(&imxdrm->mutex);
560 EXPORT_SYMBOL_GPL(imx_drm_remove_crtc);
563 * imx_drm_add_encoder - add a new encoder
565 int imx_drm_add_encoder(struct drm_encoder *encoder,
566 struct imx_drm_encoder **newenc, struct module *owner)
568 struct imx_drm_device *imxdrm = __imx_drm_device();
569 struct imx_drm_encoder *imx_drm_encoder;
572 mutex_lock(&imxdrm->mutex);
574 if (imxdrm->drm->open_count) {
579 imx_drm_encoder = kzalloc(sizeof(*imx_drm_encoder), GFP_KERNEL);
580 if (!imx_drm_encoder) {
585 imx_drm_encoder->encoder = encoder;
586 imx_drm_encoder->owner = owner;
588 ret = imx_drm_encoder_register(imx_drm_encoder);
594 list_add_tail(&imx_drm_encoder->list, &imxdrm->encoder_list);
596 *newenc = imx_drm_encoder;
598 mutex_unlock(&imxdrm->mutex);
603 kfree(imx_drm_encoder);
606 mutex_unlock(&imxdrm->mutex);
610 EXPORT_SYMBOL_GPL(imx_drm_add_encoder);
612 int imx_drm_encoder_add_possible_crtcs(
613 struct imx_drm_encoder *imx_drm_encoder,
614 struct device_node *np)
616 struct imx_drm_device *imxdrm = __imx_drm_device();
617 struct of_phandle_args args;
618 struct crtc_cookie *c;
622 if (!list_empty(&imx_drm_encoder->possible_crtcs))
625 for (i = 0; !ret; i++) {
626 ret = of_parse_phandle_with_args(np, "crtcs",
627 "#crtc-cells", i, &args);
631 c = kzalloc(sizeof(*c), GFP_KERNEL);
633 of_node_put(args.np);
638 c->id = args.args_count > 0 ? args.args[0] : 0;
640 of_node_put(args.np);
642 mutex_lock(&imxdrm->mutex);
644 list_add_tail(&c->list, &imx_drm_encoder->possible_crtcs);
646 mutex_unlock(&imxdrm->mutex);
649 imx_drm_update_possible_crtcs();
653 EXPORT_SYMBOL_GPL(imx_drm_encoder_add_possible_crtcs);
655 int imx_drm_encoder_get_mux_id(struct imx_drm_encoder *imx_drm_encoder,
656 struct drm_crtc *crtc)
658 struct imx_drm_device *imxdrm = __imx_drm_device();
659 struct imx_drm_crtc *imx_crtc;
662 list_for_each_entry(imx_crtc, &imxdrm->crtc_list, list) {
663 if (imx_crtc->crtc == crtc)
672 EXPORT_SYMBOL_GPL(imx_drm_encoder_get_mux_id);
675 * imx_drm_remove_encoder - remove an encoder
677 int imx_drm_remove_encoder(struct imx_drm_encoder *imx_drm_encoder)
679 struct imx_drm_device *imxdrm = __imx_drm_device();
680 struct crtc_cookie *c, *tmp;
682 mutex_lock(&imxdrm->mutex);
684 imx_drm_encoder_unregister(imx_drm_encoder);
686 list_del(&imx_drm_encoder->list);
688 list_for_each_entry_safe(c, tmp, &imx_drm_encoder->possible_crtcs,
692 mutex_unlock(&imxdrm->mutex);
694 kfree(imx_drm_encoder);
698 EXPORT_SYMBOL_GPL(imx_drm_remove_encoder);
701 * imx_drm_add_connector - add a connector
703 int imx_drm_add_connector(struct drm_connector *connector,
704 struct imx_drm_connector **new_con,
705 struct module *owner)
707 struct imx_drm_device *imxdrm = __imx_drm_device();
708 struct imx_drm_connector *imx_drm_connector;
711 mutex_lock(&imxdrm->mutex);
713 if (imxdrm->drm->open_count) {
718 imx_drm_connector = kzalloc(sizeof(*imx_drm_connector), GFP_KERNEL);
719 if (!imx_drm_connector) {
724 imx_drm_connector->connector = connector;
725 imx_drm_connector->owner = owner;
727 ret = imx_drm_connector_register(imx_drm_connector);
731 list_add_tail(&imx_drm_connector->list, &imxdrm->connector_list);
733 *new_con = imx_drm_connector;
735 mutex_unlock(&imxdrm->mutex);
740 kfree(imx_drm_connector);
743 mutex_unlock(&imxdrm->mutex);
747 EXPORT_SYMBOL_GPL(imx_drm_add_connector);
749 void imx_drm_fb_helper_set(struct drm_fbdev_cma *fbdev_helper)
751 struct imx_drm_device *imxdrm = __imx_drm_device();
753 imxdrm->fbhelper = fbdev_helper;
755 EXPORT_SYMBOL_GPL(imx_drm_fb_helper_set);
758 * imx_drm_remove_connector - remove a connector
760 int imx_drm_remove_connector(struct imx_drm_connector *imx_drm_connector)
762 struct imx_drm_device *imxdrm = __imx_drm_device();
764 mutex_lock(&imxdrm->mutex);
766 imx_drm_connector_unregister(imx_drm_connector);
768 list_del(&imx_drm_connector->list);
770 mutex_unlock(&imxdrm->mutex);
772 kfree(imx_drm_connector);
776 EXPORT_SYMBOL_GPL(imx_drm_remove_connector);
778 static const struct drm_ioctl_desc imx_drm_ioctls[] = {
782 static struct drm_driver imx_drm_driver = {
783 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME,
784 .load = imx_drm_driver_load,
785 .unload = imx_drm_driver_unload,
786 .lastclose = imx_drm_driver_lastclose,
787 .preclose = imx_drm_driver_preclose,
788 .gem_free_object = drm_gem_cma_free_object,
789 .gem_vm_ops = &drm_gem_cma_vm_ops,
790 .dumb_create = drm_gem_cma_dumb_create,
791 .dumb_map_offset = drm_gem_cma_dumb_map_offset,
792 .dumb_destroy = drm_gem_dumb_destroy,
794 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
795 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
796 .gem_prime_import = drm_gem_prime_import,
797 .gem_prime_export = drm_gem_prime_export,
798 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
799 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
800 .gem_prime_vmap = drm_gem_cma_prime_vmap,
801 .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
802 .gem_prime_mmap = drm_gem_cma_prime_mmap,
803 .get_vblank_counter = drm_vblank_count,
804 .enable_vblank = imx_drm_enable_vblank,
805 .disable_vblank = imx_drm_disable_vblank,
806 .ioctls = imx_drm_ioctls,
807 .num_ioctls = ARRAY_SIZE(imx_drm_ioctls),
808 .fops = &imx_drm_driver_fops,
810 .desc = "i.MX DRM graphics",
817 static int imx_drm_platform_probe(struct platform_device *pdev)
821 ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
825 imx_drm_device->dev = &pdev->dev;
827 return drm_platform_init(&imx_drm_driver, pdev);
830 static int imx_drm_platform_remove(struct platform_device *pdev)
832 drm_platform_exit(&imx_drm_driver, pdev);
837 static struct platform_driver imx_drm_pdrv = {
838 .probe = imx_drm_platform_probe,
839 .remove = imx_drm_platform_remove,
841 .owner = THIS_MODULE,
846 static struct platform_device *imx_drm_pdev;
848 static int __init imx_drm_init(void)
852 imx_drm_device = kzalloc(sizeof(*imx_drm_device), GFP_KERNEL);
856 mutex_init(&imx_drm_device->mutex);
857 INIT_LIST_HEAD(&imx_drm_device->crtc_list);
858 INIT_LIST_HEAD(&imx_drm_device->connector_list);
859 INIT_LIST_HEAD(&imx_drm_device->encoder_list);
861 imx_drm_pdev = platform_device_register_simple("imx-drm", -1, NULL, 0);
862 if (IS_ERR(imx_drm_pdev)) {
863 ret = PTR_ERR(imx_drm_pdev);
867 ret = platform_driver_register(&imx_drm_pdrv);
874 platform_device_unregister(imx_drm_pdev);
876 kfree(imx_drm_device);
881 static void __exit imx_drm_exit(void)
883 platform_device_unregister(imx_drm_pdev);
884 platform_driver_unregister(&imx_drm_pdrv);
886 kfree(imx_drm_device);
889 module_init(imx_drm_init);
890 module_exit(imx_drm_exit);
892 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
893 MODULE_DESCRIPTION("i.MX drm driver core");
894 MODULE_LICENSE("GPL");