2 * Copyright (C) 2012 Texas Instruments
3 * Author: Rob Clark <robdclark@gmail.com>
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.
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
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/>.
18 /* LCDC DRM driver, based on da8xx-fb */
20 #include <linux/component.h>
21 #include <linux/pinctrl/consumer.h>
22 #include <linux/suspend.h>
23 #include <drm/drm_atomic.h>
24 #include <drm/drm_atomic_helper.h>
26 #include "tilcdc_drv.h"
27 #include "tilcdc_regs.h"
28 #include "tilcdc_tfp410.h"
29 #include "tilcdc_panel.h"
30 #include "tilcdc_external.h"
32 #include "drm_fb_helper.h"
34 static LIST_HEAD(module_list);
36 void tilcdc_module_init(struct tilcdc_module *mod, const char *name,
37 const struct tilcdc_module_ops *funcs)
41 INIT_LIST_HEAD(&mod->list);
42 list_add(&mod->list, &module_list);
45 void tilcdc_module_cleanup(struct tilcdc_module *mod)
50 static struct of_device_id tilcdc_of_match[];
52 static struct drm_framebuffer *tilcdc_fb_create(struct drm_device *dev,
53 struct drm_file *file_priv, const struct drm_mode_fb_cmd2 *mode_cmd)
55 return drm_fb_cma_create(dev, file_priv, mode_cmd);
58 static void tilcdc_fb_output_poll_changed(struct drm_device *dev)
60 struct tilcdc_drm_private *priv = dev->dev_private;
61 drm_fbdev_cma_hotplug_event(priv->fbdev);
64 int tilcdc_atomic_check(struct drm_device *dev,
65 struct drm_atomic_state *state)
69 ret = drm_atomic_helper_check_modeset(dev, state);
73 ret = drm_atomic_helper_check_planes(dev, state);
78 * tilcdc ->atomic_check can update ->mode_changed if pixel format
79 * changes, hence will we check modeset changes again.
81 ret = drm_atomic_helper_check_modeset(dev, state);
88 static int tilcdc_commit(struct drm_device *dev,
89 struct drm_atomic_state *state,
94 ret = drm_atomic_helper_prepare_planes(dev, state);
98 drm_atomic_helper_swap_state(state, true);
101 * Everything below can be run asynchronously without the need to grab
102 * any modeset locks at all under one condition: It must be guaranteed
103 * that the asynchronous work has either been cancelled (if the driver
104 * supports it, which at least requires that the framebuffers get
105 * cleaned up with drm_atomic_helper_cleanup_planes()) or completed
106 * before the new state gets committed on the software side with
107 * drm_atomic_helper_swap_state().
109 * This scheme allows new atomic state updates to be prepared and
110 * checked in parallel to the asynchronous completion of the previous
111 * update. Which is important since compositors need to figure out the
112 * composition of the next frame right after having submitted the
116 drm_atomic_helper_commit_modeset_disables(dev, state);
118 drm_atomic_helper_commit_planes(dev, state, false);
120 drm_atomic_helper_commit_modeset_enables(dev, state);
122 drm_atomic_helper_wait_for_vblanks(dev, state);
124 drm_atomic_helper_cleanup_planes(dev, state);
126 drm_atomic_state_free(state);
131 static const struct drm_mode_config_funcs mode_config_funcs = {
132 .fb_create = tilcdc_fb_create,
133 .output_poll_changed = tilcdc_fb_output_poll_changed,
134 .atomic_check = tilcdc_atomic_check,
135 .atomic_commit = tilcdc_commit,
138 static int modeset_init(struct drm_device *dev)
140 struct tilcdc_drm_private *priv = dev->dev_private;
141 struct tilcdc_module *mod;
143 drm_mode_config_init(dev);
145 priv->crtc = tilcdc_crtc_create(dev);
147 list_for_each_entry(mod, &module_list, list) {
148 DBG("loading module: %s", mod->name);
149 mod->funcs->modeset_init(mod, dev);
152 dev->mode_config.min_width = 0;
153 dev->mode_config.min_height = 0;
154 dev->mode_config.max_width = tilcdc_crtc_max_width(priv->crtc);
155 dev->mode_config.max_height = 2048;
156 dev->mode_config.funcs = &mode_config_funcs;
161 #ifdef CONFIG_CPU_FREQ
162 static int cpufreq_transition(struct notifier_block *nb,
163 unsigned long val, void *data)
165 struct tilcdc_drm_private *priv = container_of(nb,
166 struct tilcdc_drm_private, freq_transition);
167 if (val == CPUFREQ_POSTCHANGE) {
168 if (priv->lcd_fck_rate != clk_get_rate(priv->clk)) {
169 priv->lcd_fck_rate = clk_get_rate(priv->clk);
170 tilcdc_crtc_update_clk(priv->crtc);
182 static int tilcdc_unload(struct drm_device *dev)
184 struct tilcdc_drm_private *priv = dev->dev_private;
186 tilcdc_crtc_dpms(priv->crtc, DRM_MODE_DPMS_OFF);
188 tilcdc_remove_external_encoders(dev);
190 drm_fbdev_cma_fini(priv->fbdev);
191 drm_kms_helper_poll_fini(dev);
192 drm_mode_config_cleanup(dev);
193 drm_vblank_cleanup(dev);
195 drm_irq_uninstall(dev);
197 #ifdef CONFIG_CPU_FREQ
198 cpufreq_unregister_notifier(&priv->freq_transition,
199 CPUFREQ_TRANSITION_NOTIFIER);
208 flush_workqueue(priv->wq);
209 destroy_workqueue(priv->wq);
211 dev->dev_private = NULL;
213 pm_runtime_disable(dev->dev);
218 static size_t tilcdc_num_regs(void);
220 static int tilcdc_load(struct drm_device *dev, unsigned long flags)
222 struct platform_device *pdev = dev->platformdev;
223 struct device_node *node = pdev->dev.of_node;
224 struct tilcdc_drm_private *priv;
225 struct tilcdc_module *mod;
226 struct resource *res;
230 priv = devm_kzalloc(dev->dev, sizeof(*priv), GFP_KERNEL);
232 priv->saved_register =
233 devm_kcalloc(dev->dev, tilcdc_num_regs(),
234 sizeof(*priv->saved_register), GFP_KERNEL);
235 if (!priv || !priv->saved_register) {
236 dev_err(dev->dev, "failed to allocate private data\n");
240 dev->dev_private = priv;
242 priv->is_componentized =
243 tilcdc_get_external_components(dev->dev, NULL) > 0;
245 priv->wq = alloc_ordered_workqueue("tilcdc", 0);
248 goto fail_unset_priv;
251 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
253 dev_err(dev->dev, "failed to get memory resource\n");
258 priv->mmio = ioremap_nocache(res->start, resource_size(res));
260 dev_err(dev->dev, "failed to ioremap\n");
265 priv->clk = clk_get(dev->dev, "fck");
266 if (IS_ERR(priv->clk)) {
267 dev_err(dev->dev, "failed to get functional clock\n");
272 #ifdef CONFIG_CPU_FREQ
273 priv->lcd_fck_rate = clk_get_rate(priv->clk);
274 priv->freq_transition.notifier_call = cpufreq_transition;
275 ret = cpufreq_register_notifier(&priv->freq_transition,
276 CPUFREQ_TRANSITION_NOTIFIER);
278 dev_err(dev->dev, "failed to register cpufreq notifier\n");
283 if (of_property_read_u32(node, "max-bandwidth", &priv->max_bandwidth))
284 priv->max_bandwidth = TILCDC_DEFAULT_MAX_BANDWIDTH;
286 DBG("Maximum Bandwidth Value %d", priv->max_bandwidth);
288 if (of_property_read_u32(node, "ti,max-width", &priv->max_width))
289 priv->max_width = TILCDC_DEFAULT_MAX_WIDTH;
291 DBG("Maximum Horizontal Pixel Width Value %dpixels", priv->max_width);
293 if (of_property_read_u32(node, "ti,max-pixelclock",
294 &priv->max_pixelclock))
295 priv->max_pixelclock = TILCDC_DEFAULT_MAX_PIXELCLOCK;
297 DBG("Maximum Pixel Clock Value %dKHz", priv->max_pixelclock);
299 pm_runtime_enable(dev->dev);
301 /* Determine LCD IP Version */
302 pm_runtime_get_sync(dev->dev);
303 switch (tilcdc_read(dev, LCDC_PID_REG)) {
312 dev_warn(dev->dev, "Unknown PID Reg value 0x%08x, "
313 "defaulting to LCD revision 1\n",
314 tilcdc_read(dev, LCDC_PID_REG));
319 pm_runtime_put_sync(dev->dev);
321 ret = modeset_init(dev);
323 dev_err(dev->dev, "failed to initialize mode setting\n");
324 goto fail_cpufreq_unregister;
327 platform_set_drvdata(pdev, dev);
329 if (priv->is_componentized) {
330 ret = component_bind_all(dev->dev, dev);
332 goto fail_mode_config_cleanup;
334 ret = tilcdc_add_external_encoders(dev, &bpp);
336 goto fail_component_cleanup;
339 if ((priv->num_encoders == 0) || (priv->num_connectors == 0)) {
340 dev_err(dev->dev, "no encoders/connectors found\n");
342 goto fail_external_cleanup;
345 ret = drm_vblank_init(dev, 1);
347 dev_err(dev->dev, "failed to initialize vblank\n");
348 goto fail_external_cleanup;
351 ret = drm_irq_install(dev, platform_get_irq(dev->platformdev, 0));
353 dev_err(dev->dev, "failed to install IRQ handler\n");
354 goto fail_vblank_cleanup;
357 list_for_each_entry(mod, &module_list, list) {
358 DBG("%s: preferred_bpp: %d", mod->name, mod->preferred_bpp);
359 bpp = mod->preferred_bpp;
364 drm_helper_disable_unused_functions(dev);
366 drm_mode_config_reset(dev);
368 priv->fbdev = drm_fbdev_cma_init(dev, bpp,
369 dev->mode_config.num_crtc,
370 dev->mode_config.num_connector);
371 if (IS_ERR(priv->fbdev)) {
372 ret = PTR_ERR(priv->fbdev);
373 goto fail_irq_uninstall;
376 drm_kms_helper_poll_init(dev);
381 drm_irq_uninstall(dev);
384 drm_vblank_cleanup(dev);
386 fail_mode_config_cleanup:
387 drm_mode_config_cleanup(dev);
389 fail_component_cleanup:
390 if (priv->is_componentized)
391 component_unbind_all(dev->dev, dev);
393 fail_external_cleanup:
394 tilcdc_remove_external_encoders(dev);
396 fail_cpufreq_unregister:
397 pm_runtime_disable(dev->dev);
398 #ifdef CONFIG_CPU_FREQ
399 cpufreq_unregister_notifier(&priv->freq_transition,
400 CPUFREQ_TRANSITION_NOTIFIER);
410 flush_workqueue(priv->wq);
411 destroy_workqueue(priv->wq);
414 dev->dev_private = NULL;
419 static void tilcdc_lastclose(struct drm_device *dev)
421 struct tilcdc_drm_private *priv = dev->dev_private;
422 drm_fbdev_cma_restore_mode(priv->fbdev);
425 static irqreturn_t tilcdc_irq(int irq, void *arg)
427 struct drm_device *dev = arg;
428 struct tilcdc_drm_private *priv = dev->dev_private;
429 return tilcdc_crtc_irq(priv->crtc);
432 static int tilcdc_enable_vblank(struct drm_device *dev, unsigned int pipe)
437 static void tilcdc_disable_vblank(struct drm_device *dev, unsigned int pipe)
442 #if defined(CONFIG_DEBUG_FS) || defined(CONFIG_PM_SLEEP)
443 static const struct {
449 #define REG(rev, save, reg) { #reg, rev, save, reg }
450 /* exists in revision 1: */
451 REG(1, false, LCDC_PID_REG),
452 REG(1, true, LCDC_CTRL_REG),
453 REG(1, false, LCDC_STAT_REG),
454 REG(1, true, LCDC_RASTER_CTRL_REG),
455 REG(1, true, LCDC_RASTER_TIMING_0_REG),
456 REG(1, true, LCDC_RASTER_TIMING_1_REG),
457 REG(1, true, LCDC_RASTER_TIMING_2_REG),
458 REG(1, true, LCDC_DMA_CTRL_REG),
459 REG(1, true, LCDC_DMA_FB_BASE_ADDR_0_REG),
460 REG(1, true, LCDC_DMA_FB_CEILING_ADDR_0_REG),
461 REG(1, true, LCDC_DMA_FB_BASE_ADDR_1_REG),
462 REG(1, true, LCDC_DMA_FB_CEILING_ADDR_1_REG),
463 /* new in revision 2: */
464 REG(2, false, LCDC_RAW_STAT_REG),
465 REG(2, false, LCDC_MASKED_STAT_REG),
466 REG(2, true, LCDC_INT_ENABLE_SET_REG),
467 REG(2, false, LCDC_INT_ENABLE_CLR_REG),
468 REG(2, false, LCDC_END_OF_INT_IND_REG),
469 REG(2, true, LCDC_CLK_ENABLE_REG),
473 static size_t tilcdc_num_regs(void)
475 return ARRAY_SIZE(registers);
478 static size_t tilcdc_num_regs(void)
484 #ifdef CONFIG_DEBUG_FS
485 static int tilcdc_regs_show(struct seq_file *m, void *arg)
487 struct drm_info_node *node = (struct drm_info_node *) m->private;
488 struct drm_device *dev = node->minor->dev;
489 struct tilcdc_drm_private *priv = dev->dev_private;
492 pm_runtime_get_sync(dev->dev);
494 seq_printf(m, "revision: %d\n", priv->rev);
496 for (i = 0; i < ARRAY_SIZE(registers); i++)
497 if (priv->rev >= registers[i].rev)
498 seq_printf(m, "%s:\t %08x\n", registers[i].name,
499 tilcdc_read(dev, registers[i].reg));
501 pm_runtime_put_sync(dev->dev);
506 static int tilcdc_mm_show(struct seq_file *m, void *arg)
508 struct drm_info_node *node = (struct drm_info_node *) m->private;
509 struct drm_device *dev = node->minor->dev;
510 return drm_mm_dump_table(m, &dev->vma_offset_manager->vm_addr_space_mm);
513 static struct drm_info_list tilcdc_debugfs_list[] = {
514 { "regs", tilcdc_regs_show, 0 },
515 { "mm", tilcdc_mm_show, 0 },
516 { "fb", drm_fb_cma_debugfs_show, 0 },
519 static int tilcdc_debugfs_init(struct drm_minor *minor)
521 struct drm_device *dev = minor->dev;
522 struct tilcdc_module *mod;
525 ret = drm_debugfs_create_files(tilcdc_debugfs_list,
526 ARRAY_SIZE(tilcdc_debugfs_list),
527 minor->debugfs_root, minor);
529 list_for_each_entry(mod, &module_list, list)
530 if (mod->funcs->debugfs_init)
531 mod->funcs->debugfs_init(mod, minor);
534 dev_err(dev->dev, "could not install tilcdc_debugfs_list\n");
541 static void tilcdc_debugfs_cleanup(struct drm_minor *minor)
543 struct tilcdc_module *mod;
544 drm_debugfs_remove_files(tilcdc_debugfs_list,
545 ARRAY_SIZE(tilcdc_debugfs_list), minor);
547 list_for_each_entry(mod, &module_list, list)
548 if (mod->funcs->debugfs_cleanup)
549 mod->funcs->debugfs_cleanup(mod, minor);
553 static const struct file_operations fops = {
554 .owner = THIS_MODULE,
556 .release = drm_release,
557 .unlocked_ioctl = drm_ioctl,
559 .compat_ioctl = drm_compat_ioctl,
564 .mmap = drm_gem_cma_mmap,
567 static struct drm_driver tilcdc_driver = {
568 .driver_features = (DRIVER_HAVE_IRQ | DRIVER_GEM | DRIVER_MODESET |
569 DRIVER_PRIME | DRIVER_ATOMIC),
571 .unload = tilcdc_unload,
572 .lastclose = tilcdc_lastclose,
573 .irq_handler = tilcdc_irq,
574 .get_vblank_counter = drm_vblank_no_hw_counter,
575 .enable_vblank = tilcdc_enable_vblank,
576 .disable_vblank = tilcdc_disable_vblank,
577 .gem_free_object_unlocked = drm_gem_cma_free_object,
578 .gem_vm_ops = &drm_gem_cma_vm_ops,
579 .dumb_create = drm_gem_cma_dumb_create,
580 .dumb_map_offset = drm_gem_cma_dumb_map_offset,
581 .dumb_destroy = drm_gem_dumb_destroy,
583 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
584 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
585 .gem_prime_import = drm_gem_prime_import,
586 .gem_prime_export = drm_gem_prime_export,
587 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
588 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
589 .gem_prime_vmap = drm_gem_cma_prime_vmap,
590 .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
591 .gem_prime_mmap = drm_gem_cma_prime_mmap,
592 #ifdef CONFIG_DEBUG_FS
593 .debugfs_init = tilcdc_debugfs_init,
594 .debugfs_cleanup = tilcdc_debugfs_cleanup,
598 .desc = "TI LCD Controller DRM",
608 #ifdef CONFIG_PM_SLEEP
609 static int tilcdc_pm_suspend(struct device *dev)
611 struct drm_device *ddev = dev_get_drvdata(dev);
612 struct tilcdc_drm_private *priv = ddev->dev_private;
615 drm_kms_helper_poll_disable(ddev);
617 /* Select sleep pin state */
618 pinctrl_pm_select_sleep_state(dev);
620 if (pm_runtime_suspended(dev)) {
621 priv->ctx_valid = false;
625 /* Disable the LCDC controller, to avoid locking up the PRCM */
626 priv->saved_dpms_state = tilcdc_crtc_current_dpms_state(priv->crtc);
627 tilcdc_crtc_dpms(priv->crtc, DRM_MODE_DPMS_OFF);
629 /* Save register state: */
630 for (i = 0; i < ARRAY_SIZE(registers); i++)
631 if (registers[i].save && (priv->rev >= registers[i].rev))
632 priv->saved_register[n++] = tilcdc_read(ddev, registers[i].reg);
634 priv->ctx_valid = true;
639 static int tilcdc_pm_resume(struct device *dev)
641 struct drm_device *ddev = dev_get_drvdata(dev);
642 struct tilcdc_drm_private *priv = ddev->dev_private;
645 /* Select default pin state */
646 pinctrl_pm_select_default_state(dev);
648 if (priv->ctx_valid == true) {
649 /* Restore register state: */
650 for (i = 0; i < ARRAY_SIZE(registers); i++)
651 if (registers[i].save &&
652 (priv->rev >= registers[i].rev))
653 tilcdc_write(ddev, registers[i].reg,
654 priv->saved_register[n++]);
657 tilcdc_crtc_dpms(priv->crtc, priv->saved_dpms_state);
659 drm_kms_helper_poll_enable(ddev);
665 static const struct dev_pm_ops tilcdc_pm_ops = {
666 SET_SYSTEM_SLEEP_PM_OPS(tilcdc_pm_suspend, tilcdc_pm_resume)
673 static int tilcdc_bind(struct device *dev)
675 return drm_platform_init(&tilcdc_driver, to_platform_device(dev));
678 static void tilcdc_unbind(struct device *dev)
680 struct drm_device *ddev = dev_get_drvdata(dev);
682 /* Check if a subcomponent has already triggered the unloading. */
683 if (!ddev->dev_private)
686 drm_put_dev(dev_get_drvdata(dev));
689 static const struct component_master_ops tilcdc_comp_ops = {
691 .unbind = tilcdc_unbind,
694 static int tilcdc_pdev_probe(struct platform_device *pdev)
696 struct component_match *match = NULL;
699 /* bail out early if no DT data: */
700 if (!pdev->dev.of_node) {
701 dev_err(&pdev->dev, "device-tree data is missing\n");
705 ret = tilcdc_get_external_components(&pdev->dev, &match);
709 return drm_platform_init(&tilcdc_driver, pdev);
711 return component_master_add_with_match(&pdev->dev,
716 static int tilcdc_pdev_remove(struct platform_device *pdev)
720 ret = tilcdc_get_external_components(&pdev->dev, NULL);
724 drm_put_dev(platform_get_drvdata(pdev));
726 component_master_del(&pdev->dev, &tilcdc_comp_ops);
731 static struct of_device_id tilcdc_of_match[] = {
732 { .compatible = "ti,am33xx-tilcdc", },
735 MODULE_DEVICE_TABLE(of, tilcdc_of_match);
737 static struct platform_driver tilcdc_platform_driver = {
738 .probe = tilcdc_pdev_probe,
739 .remove = tilcdc_pdev_remove,
742 .pm = &tilcdc_pm_ops,
743 .of_match_table = tilcdc_of_match,
747 static int __init tilcdc_drm_init(void)
750 tilcdc_tfp410_init();
752 return platform_driver_register(&tilcdc_platform_driver);
755 static void __exit tilcdc_drm_fini(void)
758 platform_driver_unregister(&tilcdc_platform_driver);
760 tilcdc_tfp410_fini();
763 module_init(tilcdc_drm_init);
764 module_exit(tilcdc_drm_fini);
766 MODULE_AUTHOR("Rob Clark <robdclark@gmail.com");
767 MODULE_DESCRIPTION("TI LCD Controller DRM Driver");
768 MODULE_LICENSE("GPL");