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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2012 Texas Instruments
4 * Author: Rob Clark <robdclark@gmail.com>
5 */
6
7/* LCDC DRM driver, based on da8xx-fb */
8
9#include <linux/component.h>
10#include <linux/mod_devicetable.h>
11#include <linux/module.h>
12#include <linux/pinctrl/consumer.h>
13#include <linux/platform_device.h>
14#include <linux/pm_runtime.h>
15
16#include <drm/drm_atomic_helper.h>
17#include <drm/drm_client_setup.h>
18#include <drm/drm_debugfs.h>
19#include <drm/drm_drv.h>
20#include <drm/drm_fbdev_dma.h>
21#include <drm/drm_fourcc.h>
22#include <drm/drm_gem_dma_helper.h>
23#include <drm/drm_gem_framebuffer_helper.h>
24#include <drm/drm_mm.h>
25#include <drm/drm_probe_helper.h>
26#include <drm/drm_vblank.h>
27
28
29#include "tilcdc_drv.h"
30#include "tilcdc_external.h"
31#include "tilcdc_panel.h"
32#include "tilcdc_regs.h"
33
34static LIST_HEAD(module_list);
35
36static const u32 tilcdc_rev1_formats[] = { DRM_FORMAT_RGB565 };
37
38static const u32 tilcdc_straight_formats[] = { DRM_FORMAT_RGB565,
39 DRM_FORMAT_BGR888,
40 DRM_FORMAT_XBGR8888 };
41
42static const u32 tilcdc_crossed_formats[] = { DRM_FORMAT_BGR565,
43 DRM_FORMAT_RGB888,
44 DRM_FORMAT_XRGB8888 };
45
46static const u32 tilcdc_legacy_formats[] = { DRM_FORMAT_RGB565,
47 DRM_FORMAT_RGB888,
48 DRM_FORMAT_XRGB8888 };
49
50void tilcdc_module_init(struct tilcdc_module *mod, const char *name,
51 const struct tilcdc_module_ops *funcs)
52{
53 mod->name = name;
54 mod->funcs = funcs;
55 INIT_LIST_HEAD(&mod->list);
56 list_add(&mod->list, &module_list);
57}
58
59void tilcdc_module_cleanup(struct tilcdc_module *mod)
60{
61 list_del(&mod->list);
62}
63
64static int tilcdc_atomic_check(struct drm_device *dev,
65 struct drm_atomic_state *state)
66{
67 int ret;
68
69 ret = drm_atomic_helper_check_modeset(dev, state);
70 if (ret)
71 return ret;
72
73 ret = drm_atomic_helper_check_planes(dev, state);
74 if (ret)
75 return ret;
76
77 /*
78 * tilcdc ->atomic_check can update ->mode_changed if pixel format
79 * changes, hence will we check modeset changes again.
80 */
81 ret = drm_atomic_helper_check_modeset(dev, state);
82 if (ret)
83 return ret;
84
85 return ret;
86}
87
88static const struct drm_mode_config_funcs mode_config_funcs = {
89 .fb_create = drm_gem_fb_create,
90 .atomic_check = tilcdc_atomic_check,
91 .atomic_commit = drm_atomic_helper_commit,
92};
93
94static void modeset_init(struct drm_device *dev)
95{
96 struct tilcdc_drm_private *priv = dev->dev_private;
97 struct tilcdc_module *mod;
98
99 list_for_each_entry(mod, &module_list, list) {
100 DBG("loading module: %s", mod->name);
101 mod->funcs->modeset_init(mod, dev);
102 }
103
104 dev->mode_config.min_width = 0;
105 dev->mode_config.min_height = 0;
106 dev->mode_config.max_width = priv->max_width;
107 dev->mode_config.max_height = 2048;
108 dev->mode_config.funcs = &mode_config_funcs;
109}
110
111#ifdef CONFIG_CPU_FREQ
112static int cpufreq_transition(struct notifier_block *nb,
113 unsigned long val, void *data)
114{
115 struct tilcdc_drm_private *priv = container_of(nb,
116 struct tilcdc_drm_private, freq_transition);
117
118 if (val == CPUFREQ_POSTCHANGE)
119 tilcdc_crtc_update_clk(priv->crtc);
120
121 return 0;
122}
123#endif
124
125static irqreturn_t tilcdc_irq(int irq, void *arg)
126{
127 struct drm_device *dev = arg;
128 struct tilcdc_drm_private *priv = dev->dev_private;
129
130 return tilcdc_crtc_irq(priv->crtc);
131}
132
133static int tilcdc_irq_install(struct drm_device *dev, unsigned int irq)
134{
135 struct tilcdc_drm_private *priv = dev->dev_private;
136 int ret;
137
138 ret = request_irq(irq, tilcdc_irq, 0, dev->driver->name, dev);
139 if (ret)
140 return ret;
141
142 priv->irq_enabled = true;
143
144 return 0;
145}
146
147static void tilcdc_irq_uninstall(struct drm_device *dev)
148{
149 struct tilcdc_drm_private *priv = dev->dev_private;
150
151 if (!priv->irq_enabled)
152 return;
153
154 free_irq(priv->irq, dev);
155 priv->irq_enabled = false;
156}
157
158/*
159 * DRM operations:
160 */
161
162static void tilcdc_fini(struct drm_device *dev)
163{
164 struct tilcdc_drm_private *priv = dev->dev_private;
165
166#ifdef CONFIG_CPU_FREQ
167 if (priv->freq_transition.notifier_call)
168 cpufreq_unregister_notifier(&priv->freq_transition,
169 CPUFREQ_TRANSITION_NOTIFIER);
170#endif
171
172 if (priv->crtc)
173 tilcdc_crtc_shutdown(priv->crtc);
174
175 if (priv->is_registered)
176 drm_dev_unregister(dev);
177
178 drm_kms_helper_poll_fini(dev);
179 drm_atomic_helper_shutdown(dev);
180 tilcdc_irq_uninstall(dev);
181 drm_mode_config_cleanup(dev);
182
183 if (priv->clk)
184 clk_put(priv->clk);
185
186 if (priv->wq)
187 destroy_workqueue(priv->wq);
188
189 dev->dev_private = NULL;
190
191 pm_runtime_disable(dev->dev);
192
193 drm_dev_put(dev);
194}
195
196static int tilcdc_init(const struct drm_driver *ddrv, struct device *dev)
197{
198 struct drm_device *ddev;
199 struct platform_device *pdev = to_platform_device(dev);
200 struct device_node *node = dev->of_node;
201 struct tilcdc_drm_private *priv;
202 u32 bpp = 0;
203 int ret;
204
205 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
206 if (!priv)
207 return -ENOMEM;
208
209 ddev = drm_dev_alloc(ddrv, dev);
210 if (IS_ERR(ddev))
211 return PTR_ERR(ddev);
212
213 ddev->dev_private = priv;
214 platform_set_drvdata(pdev, ddev);
215 drm_mode_config_init(ddev);
216
217 priv->is_componentized =
218 tilcdc_get_external_components(dev, NULL) > 0;
219
220 priv->wq = alloc_ordered_workqueue("tilcdc", 0);
221 if (!priv->wq) {
222 ret = -ENOMEM;
223 goto init_failed;
224 }
225
226 priv->mmio = devm_platform_ioremap_resource(pdev, 0);
227 if (IS_ERR(priv->mmio)) {
228 dev_err(dev, "failed to request / ioremap\n");
229 ret = PTR_ERR(priv->mmio);
230 goto init_failed;
231 }
232
233 priv->clk = clk_get(dev, "fck");
234 if (IS_ERR(priv->clk)) {
235 dev_err(dev, "failed to get functional clock\n");
236 ret = -ENODEV;
237 goto init_failed;
238 }
239
240 pm_runtime_enable(dev);
241
242 /* Determine LCD IP Version */
243 pm_runtime_get_sync(dev);
244 switch (tilcdc_read(ddev, LCDC_PID_REG)) {
245 case 0x4c100102:
246 priv->rev = 1;
247 break;
248 case 0x4f200800:
249 case 0x4f201000:
250 priv->rev = 2;
251 break;
252 default:
253 dev_warn(dev, "Unknown PID Reg value 0x%08x, "
254 "defaulting to LCD revision 1\n",
255 tilcdc_read(ddev, LCDC_PID_REG));
256 priv->rev = 1;
257 break;
258 }
259
260 pm_runtime_put_sync(dev);
261
262 if (priv->rev == 1) {
263 DBG("Revision 1 LCDC supports only RGB565 format");
264 priv->pixelformats = tilcdc_rev1_formats;
265 priv->num_pixelformats = ARRAY_SIZE(tilcdc_rev1_formats);
266 bpp = 16;
267 } else {
268 const char *str = "\0";
269
270 of_property_read_string(node, "blue-and-red-wiring", &str);
271 if (0 == strcmp(str, "crossed")) {
272 DBG("Configured for crossed blue and red wires");
273 priv->pixelformats = tilcdc_crossed_formats;
274 priv->num_pixelformats =
275 ARRAY_SIZE(tilcdc_crossed_formats);
276 bpp = 32; /* Choose bpp with RGB support for fbdef */
277 } else if (0 == strcmp(str, "straight")) {
278 DBG("Configured for straight blue and red wires");
279 priv->pixelformats = tilcdc_straight_formats;
280 priv->num_pixelformats =
281 ARRAY_SIZE(tilcdc_straight_formats);
282 bpp = 16; /* Choose bpp with RGB support for fbdef */
283 } else {
284 DBG("Blue and red wiring '%s' unknown, use legacy mode",
285 str);
286 priv->pixelformats = tilcdc_legacy_formats;
287 priv->num_pixelformats =
288 ARRAY_SIZE(tilcdc_legacy_formats);
289 bpp = 16; /* This is just a guess */
290 }
291 }
292
293 if (of_property_read_u32(node, "max-bandwidth", &priv->max_bandwidth))
294 priv->max_bandwidth = TILCDC_DEFAULT_MAX_BANDWIDTH;
295
296 DBG("Maximum Bandwidth Value %d", priv->max_bandwidth);
297
298 if (of_property_read_u32(node, "max-width", &priv->max_width)) {
299 if (priv->rev == 1)
300 priv->max_width = TILCDC_DEFAULT_MAX_WIDTH_V1;
301 else
302 priv->max_width = TILCDC_DEFAULT_MAX_WIDTH_V2;
303 }
304
305 DBG("Maximum Horizontal Pixel Width Value %dpixels", priv->max_width);
306
307 if (of_property_read_u32(node, "max-pixelclock",
308 &priv->max_pixelclock))
309 priv->max_pixelclock = TILCDC_DEFAULT_MAX_PIXELCLOCK;
310
311 DBG("Maximum Pixel Clock Value %dKHz", priv->max_pixelclock);
312
313 ret = tilcdc_crtc_create(ddev);
314 if (ret < 0) {
315 dev_err(dev, "failed to create crtc\n");
316 goto init_failed;
317 }
318 modeset_init(ddev);
319
320#ifdef CONFIG_CPU_FREQ
321 priv->freq_transition.notifier_call = cpufreq_transition;
322 ret = cpufreq_register_notifier(&priv->freq_transition,
323 CPUFREQ_TRANSITION_NOTIFIER);
324 if (ret) {
325 dev_err(dev, "failed to register cpufreq notifier\n");
326 priv->freq_transition.notifier_call = NULL;
327 goto init_failed;
328 }
329#endif
330
331 if (priv->is_componentized) {
332 ret = component_bind_all(dev, ddev);
333 if (ret < 0)
334 goto init_failed;
335
336 ret = tilcdc_add_component_encoder(ddev);
337 if (ret < 0)
338 goto init_failed;
339 } else {
340 ret = tilcdc_attach_external_device(ddev);
341 if (ret)
342 goto init_failed;
343 }
344
345 if (!priv->external_connector &&
346 ((priv->num_encoders == 0) || (priv->num_connectors == 0))) {
347 dev_err(dev, "no encoders/connectors found\n");
348 ret = -EPROBE_DEFER;
349 goto init_failed;
350 }
351
352 ret = drm_vblank_init(ddev, 1);
353 if (ret < 0) {
354 dev_err(dev, "failed to initialize vblank\n");
355 goto init_failed;
356 }
357
358 ret = platform_get_irq(pdev, 0);
359 if (ret < 0)
360 goto init_failed;
361 priv->irq = ret;
362
363 ret = tilcdc_irq_install(ddev, priv->irq);
364 if (ret < 0) {
365 dev_err(dev, "failed to install IRQ handler\n");
366 goto init_failed;
367 }
368
369 drm_mode_config_reset(ddev);
370
371 drm_kms_helper_poll_init(ddev);
372
373 ret = drm_dev_register(ddev, 0);
374 if (ret)
375 goto init_failed;
376 priv->is_registered = true;
377
378 drm_client_setup_with_color_mode(ddev, bpp);
379
380 return 0;
381
382init_failed:
383 tilcdc_fini(ddev);
384 platform_set_drvdata(pdev, NULL);
385
386 return ret;
387}
388
389#if defined(CONFIG_DEBUG_FS)
390static const struct {
391 const char *name;
392 uint8_t rev;
393 uint8_t save;
394 uint32_t reg;
395} registers[] = {
396#define REG(rev, save, reg) { #reg, rev, save, reg }
397 /* exists in revision 1: */
398 REG(1, false, LCDC_PID_REG),
399 REG(1, true, LCDC_CTRL_REG),
400 REG(1, false, LCDC_STAT_REG),
401 REG(1, true, LCDC_RASTER_CTRL_REG),
402 REG(1, true, LCDC_RASTER_TIMING_0_REG),
403 REG(1, true, LCDC_RASTER_TIMING_1_REG),
404 REG(1, true, LCDC_RASTER_TIMING_2_REG),
405 REG(1, true, LCDC_DMA_CTRL_REG),
406 REG(1, true, LCDC_DMA_FB_BASE_ADDR_0_REG),
407 REG(1, true, LCDC_DMA_FB_CEILING_ADDR_0_REG),
408 REG(1, true, LCDC_DMA_FB_BASE_ADDR_1_REG),
409 REG(1, true, LCDC_DMA_FB_CEILING_ADDR_1_REG),
410 /* new in revision 2: */
411 REG(2, false, LCDC_RAW_STAT_REG),
412 REG(2, false, LCDC_MASKED_STAT_REG),
413 REG(2, true, LCDC_INT_ENABLE_SET_REG),
414 REG(2, false, LCDC_INT_ENABLE_CLR_REG),
415 REG(2, false, LCDC_END_OF_INT_IND_REG),
416 REG(2, true, LCDC_CLK_ENABLE_REG),
417#undef REG
418};
419
420#endif
421
422#ifdef CONFIG_DEBUG_FS
423static int tilcdc_regs_show(struct seq_file *m, void *arg)
424{
425 struct drm_info_node *node = (struct drm_info_node *) m->private;
426 struct drm_device *dev = node->minor->dev;
427 struct tilcdc_drm_private *priv = dev->dev_private;
428 unsigned i;
429
430 pm_runtime_get_sync(dev->dev);
431
432 seq_printf(m, "revision: %d\n", priv->rev);
433
434 for (i = 0; i < ARRAY_SIZE(registers); i++)
435 if (priv->rev >= registers[i].rev)
436 seq_printf(m, "%s:\t %08x\n", registers[i].name,
437 tilcdc_read(dev, registers[i].reg));
438
439 pm_runtime_put_sync(dev->dev);
440
441 return 0;
442}
443
444static int tilcdc_mm_show(struct seq_file *m, void *arg)
445{
446 struct drm_info_node *node = (struct drm_info_node *) m->private;
447 struct drm_device *dev = node->minor->dev;
448 struct drm_printer p = drm_seq_file_printer(m);
449 drm_mm_print(&dev->vma_offset_manager->vm_addr_space_mm, &p);
450 return 0;
451}
452
453static struct drm_info_list tilcdc_debugfs_list[] = {
454 { "regs", tilcdc_regs_show, 0, NULL },
455 { "mm", tilcdc_mm_show, 0, NULL },
456};
457
458static void tilcdc_debugfs_init(struct drm_minor *minor)
459{
460 struct tilcdc_module *mod;
461
462 drm_debugfs_create_files(tilcdc_debugfs_list,
463 ARRAY_SIZE(tilcdc_debugfs_list),
464 minor->debugfs_root, minor);
465
466 list_for_each_entry(mod, &module_list, list)
467 if (mod->funcs->debugfs_init)
468 mod->funcs->debugfs_init(mod, minor);
469}
470#endif
471
472DEFINE_DRM_GEM_DMA_FOPS(fops);
473
474static const struct drm_driver tilcdc_driver = {
475 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
476 DRM_GEM_DMA_DRIVER_OPS,
477 DRM_FBDEV_DMA_DRIVER_OPS,
478#ifdef CONFIG_DEBUG_FS
479 .debugfs_init = tilcdc_debugfs_init,
480#endif
481 .fops = &fops,
482 .name = "tilcdc",
483 .desc = "TI LCD Controller DRM",
484 .date = "20121205",
485 .major = 1,
486 .minor = 0,
487};
488
489/*
490 * Power management:
491 */
492
493static int tilcdc_pm_suspend(struct device *dev)
494{
495 struct drm_device *ddev = dev_get_drvdata(dev);
496 int ret = 0;
497
498 ret = drm_mode_config_helper_suspend(ddev);
499
500 /* Select sleep pin state */
501 pinctrl_pm_select_sleep_state(dev);
502
503 return ret;
504}
505
506static int tilcdc_pm_resume(struct device *dev)
507{
508 struct drm_device *ddev = dev_get_drvdata(dev);
509
510 /* Select default pin state */
511 pinctrl_pm_select_default_state(dev);
512 return drm_mode_config_helper_resume(ddev);
513}
514
515static DEFINE_SIMPLE_DEV_PM_OPS(tilcdc_pm_ops,
516 tilcdc_pm_suspend, tilcdc_pm_resume);
517
518/*
519 * Platform driver:
520 */
521static int tilcdc_bind(struct device *dev)
522{
523 return tilcdc_init(&tilcdc_driver, dev);
524}
525
526static void tilcdc_unbind(struct device *dev)
527{
528 struct drm_device *ddev = dev_get_drvdata(dev);
529
530 /* Check if a subcomponent has already triggered the unloading. */
531 if (!ddev->dev_private)
532 return;
533
534 tilcdc_fini(ddev);
535 dev_set_drvdata(dev, NULL);
536}
537
538static const struct component_master_ops tilcdc_comp_ops = {
539 .bind = tilcdc_bind,
540 .unbind = tilcdc_unbind,
541};
542
543static int tilcdc_pdev_probe(struct platform_device *pdev)
544{
545 struct component_match *match = NULL;
546 int ret;
547
548 /* bail out early if no DT data: */
549 if (!pdev->dev.of_node) {
550 dev_err(&pdev->dev, "device-tree data is missing\n");
551 return -ENXIO;
552 }
553
554 ret = tilcdc_get_external_components(&pdev->dev, &match);
555 if (ret < 0)
556 return ret;
557 else if (ret == 0)
558 return tilcdc_init(&tilcdc_driver, &pdev->dev);
559 else
560 return component_master_add_with_match(&pdev->dev,
561 &tilcdc_comp_ops,
562 match);
563}
564
565static void tilcdc_pdev_remove(struct platform_device *pdev)
566{
567 int ret;
568
569 ret = tilcdc_get_external_components(&pdev->dev, NULL);
570 if (ret < 0)
571 dev_err(&pdev->dev, "tilcdc_get_external_components() failed (%pe)\n",
572 ERR_PTR(ret));
573 else if (ret == 0)
574 tilcdc_fini(platform_get_drvdata(pdev));
575 else
576 component_master_del(&pdev->dev, &tilcdc_comp_ops);
577}
578
579static void tilcdc_pdev_shutdown(struct platform_device *pdev)
580{
581 drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
582}
583
584static const struct of_device_id tilcdc_of_match[] = {
585 { .compatible = "ti,am33xx-tilcdc", },
586 { .compatible = "ti,da850-tilcdc", },
587 { },
588};
589MODULE_DEVICE_TABLE(of, tilcdc_of_match);
590
591static struct platform_driver tilcdc_platform_driver = {
592 .probe = tilcdc_pdev_probe,
593 .remove = tilcdc_pdev_remove,
594 .shutdown = tilcdc_pdev_shutdown,
595 .driver = {
596 .name = "tilcdc",
597 .pm = pm_sleep_ptr(&tilcdc_pm_ops),
598 .of_match_table = tilcdc_of_match,
599 },
600};
601
602static int __init tilcdc_drm_init(void)
603{
604 if (drm_firmware_drivers_only())
605 return -ENODEV;
606
607 DBG("init");
608 tilcdc_panel_init();
609 return platform_driver_register(&tilcdc_platform_driver);
610}
611
612static void __exit tilcdc_drm_fini(void)
613{
614 DBG("fini");
615 platform_driver_unregister(&tilcdc_platform_driver);
616 tilcdc_panel_fini();
617}
618
619module_init(tilcdc_drm_init);
620module_exit(tilcdc_drm_fini);
621
622MODULE_AUTHOR("Rob Clark <robdclark@gmail.com");
623MODULE_DESCRIPTION("TI LCD Controller DRM Driver");
624MODULE_LICENSE("GPL");