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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_debugfs.h>
18#include <drm/drm_drv.h>
19#include <drm/drm_fbdev_dma.h>
20#include <drm/drm_fourcc.h>
21#include <drm/drm_gem_dma_helper.h>
22#include <drm/drm_gem_framebuffer_helper.h>
23#include <drm/drm_mm.h>
24#include <drm/drm_probe_helper.h>
25#include <drm/drm_vblank.h>
26
27
28#include "tilcdc_drv.h"
29#include "tilcdc_external.h"
30#include "tilcdc_panel.h"
31#include "tilcdc_regs.h"
32
33static LIST_HEAD(module_list);
34
35static const u32 tilcdc_rev1_formats[] = { DRM_FORMAT_RGB565 };
36
37static const u32 tilcdc_straight_formats[] = { DRM_FORMAT_RGB565,
38 DRM_FORMAT_BGR888,
39 DRM_FORMAT_XBGR8888 };
40
41static const u32 tilcdc_crossed_formats[] = { DRM_FORMAT_BGR565,
42 DRM_FORMAT_RGB888,
43 DRM_FORMAT_XRGB8888 };
44
45static const u32 tilcdc_legacy_formats[] = { DRM_FORMAT_RGB565,
46 DRM_FORMAT_RGB888,
47 DRM_FORMAT_XRGB8888 };
48
49void tilcdc_module_init(struct tilcdc_module *mod, const char *name,
50 const struct tilcdc_module_ops *funcs)
51{
52 mod->name = name;
53 mod->funcs = funcs;
54 INIT_LIST_HEAD(&mod->list);
55 list_add(&mod->list, &module_list);
56}
57
58void tilcdc_module_cleanup(struct tilcdc_module *mod)
59{
60 list_del(&mod->list);
61}
62
63static int tilcdc_atomic_check(struct drm_device *dev,
64 struct drm_atomic_state *state)
65{
66 int ret;
67
68 ret = drm_atomic_helper_check_modeset(dev, state);
69 if (ret)
70 return ret;
71
72 ret = drm_atomic_helper_check_planes(dev, state);
73 if (ret)
74 return ret;
75
76 /*
77 * tilcdc ->atomic_check can update ->mode_changed if pixel format
78 * changes, hence will we check modeset changes again.
79 */
80 ret = drm_atomic_helper_check_modeset(dev, state);
81 if (ret)
82 return ret;
83
84 return ret;
85}
86
87static const struct drm_mode_config_funcs mode_config_funcs = {
88 .fb_create = drm_gem_fb_create,
89 .atomic_check = tilcdc_atomic_check,
90 .atomic_commit = drm_atomic_helper_commit,
91};
92
93static void modeset_init(struct drm_device *dev)
94{
95 struct tilcdc_drm_private *priv = dev->dev_private;
96 struct tilcdc_module *mod;
97
98 list_for_each_entry(mod, &module_list, list) {
99 DBG("loading module: %s", mod->name);
100 mod->funcs->modeset_init(mod, dev);
101 }
102
103 dev->mode_config.min_width = 0;
104 dev->mode_config.min_height = 0;
105 dev->mode_config.max_width = priv->max_width;
106 dev->mode_config.max_height = 2048;
107 dev->mode_config.funcs = &mode_config_funcs;
108}
109
110#ifdef CONFIG_CPU_FREQ
111static int cpufreq_transition(struct notifier_block *nb,
112 unsigned long val, void *data)
113{
114 struct tilcdc_drm_private *priv = container_of(nb,
115 struct tilcdc_drm_private, freq_transition);
116
117 if (val == CPUFREQ_POSTCHANGE)
118 tilcdc_crtc_update_clk(priv->crtc);
119
120 return 0;
121}
122#endif
123
124static irqreturn_t tilcdc_irq(int irq, void *arg)
125{
126 struct drm_device *dev = arg;
127 struct tilcdc_drm_private *priv = dev->dev_private;
128
129 return tilcdc_crtc_irq(priv->crtc);
130}
131
132static int tilcdc_irq_install(struct drm_device *dev, unsigned int irq)
133{
134 struct tilcdc_drm_private *priv = dev->dev_private;
135 int ret;
136
137 ret = request_irq(irq, tilcdc_irq, 0, dev->driver->name, dev);
138 if (ret)
139 return ret;
140
141 priv->irq_enabled = true;
142
143 return 0;
144}
145
146static void tilcdc_irq_uninstall(struct drm_device *dev)
147{
148 struct tilcdc_drm_private *priv = dev->dev_private;
149
150 if (!priv->irq_enabled)
151 return;
152
153 free_irq(priv->irq, dev);
154 priv->irq_enabled = false;
155}
156
157/*
158 * DRM operations:
159 */
160
161static void tilcdc_fini(struct drm_device *dev)
162{
163 struct tilcdc_drm_private *priv = dev->dev_private;
164
165#ifdef CONFIG_CPU_FREQ
166 if (priv->freq_transition.notifier_call)
167 cpufreq_unregister_notifier(&priv->freq_transition,
168 CPUFREQ_TRANSITION_NOTIFIER);
169#endif
170
171 if (priv->crtc)
172 tilcdc_crtc_shutdown(priv->crtc);
173
174 if (priv->is_registered)
175 drm_dev_unregister(dev);
176
177 drm_kms_helper_poll_fini(dev);
178 drm_atomic_helper_shutdown(dev);
179 tilcdc_irq_uninstall(dev);
180 drm_mode_config_cleanup(dev);
181
182 if (priv->clk)
183 clk_put(priv->clk);
184
185 if (priv->mmio)
186 iounmap(priv->mmio);
187
188 if (priv->wq)
189 destroy_workqueue(priv->wq);
190
191 dev->dev_private = NULL;
192
193 pm_runtime_disable(dev->dev);
194
195 drm_dev_put(dev);
196}
197
198static int tilcdc_init(const struct drm_driver *ddrv, struct device *dev)
199{
200 struct drm_device *ddev;
201 struct platform_device *pdev = to_platform_device(dev);
202 struct device_node *node = dev->of_node;
203 struct tilcdc_drm_private *priv;
204 struct resource *res;
205 u32 bpp = 0;
206 int ret;
207
208 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
209 if (!priv)
210 return -ENOMEM;
211
212 ddev = drm_dev_alloc(ddrv, dev);
213 if (IS_ERR(ddev))
214 return PTR_ERR(ddev);
215
216 ddev->dev_private = priv;
217 platform_set_drvdata(pdev, ddev);
218 drm_mode_config_init(ddev);
219
220 priv->is_componentized =
221 tilcdc_get_external_components(dev, NULL) > 0;
222
223 priv->wq = alloc_ordered_workqueue("tilcdc", 0);
224 if (!priv->wq) {
225 ret = -ENOMEM;
226 goto init_failed;
227 }
228
229 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
230 if (!res) {
231 dev_err(dev, "failed to get memory resource\n");
232 ret = -EINVAL;
233 goto init_failed;
234 }
235
236 priv->mmio = ioremap(res->start, resource_size(res));
237 if (!priv->mmio) {
238 dev_err(dev, "failed to ioremap\n");
239 ret = -ENOMEM;
240 goto init_failed;
241 }
242
243 priv->clk = clk_get(dev, "fck");
244 if (IS_ERR(priv->clk)) {
245 dev_err(dev, "failed to get functional clock\n");
246 ret = -ENODEV;
247 goto init_failed;
248 }
249
250 pm_runtime_enable(dev);
251
252 /* Determine LCD IP Version */
253 pm_runtime_get_sync(dev);
254 switch (tilcdc_read(ddev, LCDC_PID_REG)) {
255 case 0x4c100102:
256 priv->rev = 1;
257 break;
258 case 0x4f200800:
259 case 0x4f201000:
260 priv->rev = 2;
261 break;
262 default:
263 dev_warn(dev, "Unknown PID Reg value 0x%08x, "
264 "defaulting to LCD revision 1\n",
265 tilcdc_read(ddev, LCDC_PID_REG));
266 priv->rev = 1;
267 break;
268 }
269
270 pm_runtime_put_sync(dev);
271
272 if (priv->rev == 1) {
273 DBG("Revision 1 LCDC supports only RGB565 format");
274 priv->pixelformats = tilcdc_rev1_formats;
275 priv->num_pixelformats = ARRAY_SIZE(tilcdc_rev1_formats);
276 bpp = 16;
277 } else {
278 const char *str = "\0";
279
280 of_property_read_string(node, "blue-and-red-wiring", &str);
281 if (0 == strcmp(str, "crossed")) {
282 DBG("Configured for crossed blue and red wires");
283 priv->pixelformats = tilcdc_crossed_formats;
284 priv->num_pixelformats =
285 ARRAY_SIZE(tilcdc_crossed_formats);
286 bpp = 32; /* Choose bpp with RGB support for fbdef */
287 } else if (0 == strcmp(str, "straight")) {
288 DBG("Configured for straight blue and red wires");
289 priv->pixelformats = tilcdc_straight_formats;
290 priv->num_pixelformats =
291 ARRAY_SIZE(tilcdc_straight_formats);
292 bpp = 16; /* Choose bpp with RGB support for fbdef */
293 } else {
294 DBG("Blue and red wiring '%s' unknown, use legacy mode",
295 str);
296 priv->pixelformats = tilcdc_legacy_formats;
297 priv->num_pixelformats =
298 ARRAY_SIZE(tilcdc_legacy_formats);
299 bpp = 16; /* This is just a guess */
300 }
301 }
302
303 if (of_property_read_u32(node, "max-bandwidth", &priv->max_bandwidth))
304 priv->max_bandwidth = TILCDC_DEFAULT_MAX_BANDWIDTH;
305
306 DBG("Maximum Bandwidth Value %d", priv->max_bandwidth);
307
308 if (of_property_read_u32(node, "max-width", &priv->max_width)) {
309 if (priv->rev == 1)
310 priv->max_width = TILCDC_DEFAULT_MAX_WIDTH_V1;
311 else
312 priv->max_width = TILCDC_DEFAULT_MAX_WIDTH_V2;
313 }
314
315 DBG("Maximum Horizontal Pixel Width Value %dpixels", priv->max_width);
316
317 if (of_property_read_u32(node, "max-pixelclock",
318 &priv->max_pixelclock))
319 priv->max_pixelclock = TILCDC_DEFAULT_MAX_PIXELCLOCK;
320
321 DBG("Maximum Pixel Clock Value %dKHz", priv->max_pixelclock);
322
323 ret = tilcdc_crtc_create(ddev);
324 if (ret < 0) {
325 dev_err(dev, "failed to create crtc\n");
326 goto init_failed;
327 }
328 modeset_init(ddev);
329
330#ifdef CONFIG_CPU_FREQ
331 priv->freq_transition.notifier_call = cpufreq_transition;
332 ret = cpufreq_register_notifier(&priv->freq_transition,
333 CPUFREQ_TRANSITION_NOTIFIER);
334 if (ret) {
335 dev_err(dev, "failed to register cpufreq notifier\n");
336 priv->freq_transition.notifier_call = NULL;
337 goto init_failed;
338 }
339#endif
340
341 if (priv->is_componentized) {
342 ret = component_bind_all(dev, ddev);
343 if (ret < 0)
344 goto init_failed;
345
346 ret = tilcdc_add_component_encoder(ddev);
347 if (ret < 0)
348 goto init_failed;
349 } else {
350 ret = tilcdc_attach_external_device(ddev);
351 if (ret)
352 goto init_failed;
353 }
354
355 if (!priv->external_connector &&
356 ((priv->num_encoders == 0) || (priv->num_connectors == 0))) {
357 dev_err(dev, "no encoders/connectors found\n");
358 ret = -EPROBE_DEFER;
359 goto init_failed;
360 }
361
362 ret = drm_vblank_init(ddev, 1);
363 if (ret < 0) {
364 dev_err(dev, "failed to initialize vblank\n");
365 goto init_failed;
366 }
367
368 ret = platform_get_irq(pdev, 0);
369 if (ret < 0)
370 goto init_failed;
371 priv->irq = ret;
372
373 ret = tilcdc_irq_install(ddev, priv->irq);
374 if (ret < 0) {
375 dev_err(dev, "failed to install IRQ handler\n");
376 goto init_failed;
377 }
378
379 drm_mode_config_reset(ddev);
380
381 drm_kms_helper_poll_init(ddev);
382
383 ret = drm_dev_register(ddev, 0);
384 if (ret)
385 goto init_failed;
386 priv->is_registered = true;
387
388 drm_fbdev_dma_setup(ddev, bpp);
389 return 0;
390
391init_failed:
392 tilcdc_fini(ddev);
393 platform_set_drvdata(pdev, NULL);
394
395 return ret;
396}
397
398#if defined(CONFIG_DEBUG_FS)
399static const struct {
400 const char *name;
401 uint8_t rev;
402 uint8_t save;
403 uint32_t reg;
404} registers[] = {
405#define REG(rev, save, reg) { #reg, rev, save, reg }
406 /* exists in revision 1: */
407 REG(1, false, LCDC_PID_REG),
408 REG(1, true, LCDC_CTRL_REG),
409 REG(1, false, LCDC_STAT_REG),
410 REG(1, true, LCDC_RASTER_CTRL_REG),
411 REG(1, true, LCDC_RASTER_TIMING_0_REG),
412 REG(1, true, LCDC_RASTER_TIMING_1_REG),
413 REG(1, true, LCDC_RASTER_TIMING_2_REG),
414 REG(1, true, LCDC_DMA_CTRL_REG),
415 REG(1, true, LCDC_DMA_FB_BASE_ADDR_0_REG),
416 REG(1, true, LCDC_DMA_FB_CEILING_ADDR_0_REG),
417 REG(1, true, LCDC_DMA_FB_BASE_ADDR_1_REG),
418 REG(1, true, LCDC_DMA_FB_CEILING_ADDR_1_REG),
419 /* new in revision 2: */
420 REG(2, false, LCDC_RAW_STAT_REG),
421 REG(2, false, LCDC_MASKED_STAT_REG),
422 REG(2, true, LCDC_INT_ENABLE_SET_REG),
423 REG(2, false, LCDC_INT_ENABLE_CLR_REG),
424 REG(2, false, LCDC_END_OF_INT_IND_REG),
425 REG(2, true, LCDC_CLK_ENABLE_REG),
426#undef REG
427};
428
429#endif
430
431#ifdef CONFIG_DEBUG_FS
432static int tilcdc_regs_show(struct seq_file *m, void *arg)
433{
434 struct drm_info_node *node = (struct drm_info_node *) m->private;
435 struct drm_device *dev = node->minor->dev;
436 struct tilcdc_drm_private *priv = dev->dev_private;
437 unsigned i;
438
439 pm_runtime_get_sync(dev->dev);
440
441 seq_printf(m, "revision: %d\n", priv->rev);
442
443 for (i = 0; i < ARRAY_SIZE(registers); i++)
444 if (priv->rev >= registers[i].rev)
445 seq_printf(m, "%s:\t %08x\n", registers[i].name,
446 tilcdc_read(dev, registers[i].reg));
447
448 pm_runtime_put_sync(dev->dev);
449
450 return 0;
451}
452
453static int tilcdc_mm_show(struct seq_file *m, void *arg)
454{
455 struct drm_info_node *node = (struct drm_info_node *) m->private;
456 struct drm_device *dev = node->minor->dev;
457 struct drm_printer p = drm_seq_file_printer(m);
458 drm_mm_print(&dev->vma_offset_manager->vm_addr_space_mm, &p);
459 return 0;
460}
461
462static struct drm_info_list tilcdc_debugfs_list[] = {
463 { "regs", tilcdc_regs_show, 0, NULL },
464 { "mm", tilcdc_mm_show, 0, NULL },
465};
466
467static void tilcdc_debugfs_init(struct drm_minor *minor)
468{
469 struct tilcdc_module *mod;
470
471 drm_debugfs_create_files(tilcdc_debugfs_list,
472 ARRAY_SIZE(tilcdc_debugfs_list),
473 minor->debugfs_root, minor);
474
475 list_for_each_entry(mod, &module_list, list)
476 if (mod->funcs->debugfs_init)
477 mod->funcs->debugfs_init(mod, minor);
478}
479#endif
480
481DEFINE_DRM_GEM_DMA_FOPS(fops);
482
483static const struct drm_driver tilcdc_driver = {
484 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
485 DRM_GEM_DMA_DRIVER_OPS,
486#ifdef CONFIG_DEBUG_FS
487 .debugfs_init = tilcdc_debugfs_init,
488#endif
489 .fops = &fops,
490 .name = "tilcdc",
491 .desc = "TI LCD Controller DRM",
492 .date = "20121205",
493 .major = 1,
494 .minor = 0,
495};
496
497/*
498 * Power management:
499 */
500
501static int tilcdc_pm_suspend(struct device *dev)
502{
503 struct drm_device *ddev = dev_get_drvdata(dev);
504 int ret = 0;
505
506 ret = drm_mode_config_helper_suspend(ddev);
507
508 /* Select sleep pin state */
509 pinctrl_pm_select_sleep_state(dev);
510
511 return ret;
512}
513
514static int tilcdc_pm_resume(struct device *dev)
515{
516 struct drm_device *ddev = dev_get_drvdata(dev);
517
518 /* Select default pin state */
519 pinctrl_pm_select_default_state(dev);
520 return drm_mode_config_helper_resume(ddev);
521}
522
523static DEFINE_SIMPLE_DEV_PM_OPS(tilcdc_pm_ops,
524 tilcdc_pm_suspend, tilcdc_pm_resume);
525
526/*
527 * Platform driver:
528 */
529static int tilcdc_bind(struct device *dev)
530{
531 return tilcdc_init(&tilcdc_driver, dev);
532}
533
534static void tilcdc_unbind(struct device *dev)
535{
536 struct drm_device *ddev = dev_get_drvdata(dev);
537
538 /* Check if a subcomponent has already triggered the unloading. */
539 if (!ddev->dev_private)
540 return;
541
542 tilcdc_fini(ddev);
543 dev_set_drvdata(dev, NULL);
544}
545
546static const struct component_master_ops tilcdc_comp_ops = {
547 .bind = tilcdc_bind,
548 .unbind = tilcdc_unbind,
549};
550
551static int tilcdc_pdev_probe(struct platform_device *pdev)
552{
553 struct component_match *match = NULL;
554 int ret;
555
556 /* bail out early if no DT data: */
557 if (!pdev->dev.of_node) {
558 dev_err(&pdev->dev, "device-tree data is missing\n");
559 return -ENXIO;
560 }
561
562 ret = tilcdc_get_external_components(&pdev->dev, &match);
563 if (ret < 0)
564 return ret;
565 else if (ret == 0)
566 return tilcdc_init(&tilcdc_driver, &pdev->dev);
567 else
568 return component_master_add_with_match(&pdev->dev,
569 &tilcdc_comp_ops,
570 match);
571}
572
573static void tilcdc_pdev_remove(struct platform_device *pdev)
574{
575 int ret;
576
577 ret = tilcdc_get_external_components(&pdev->dev, NULL);
578 if (ret < 0)
579 dev_err(&pdev->dev, "tilcdc_get_external_components() failed (%pe)\n",
580 ERR_PTR(ret));
581 else if (ret == 0)
582 tilcdc_fini(platform_get_drvdata(pdev));
583 else
584 component_master_del(&pdev->dev, &tilcdc_comp_ops);
585}
586
587static void tilcdc_pdev_shutdown(struct platform_device *pdev)
588{
589 drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
590}
591
592static const struct of_device_id tilcdc_of_match[] = {
593 { .compatible = "ti,am33xx-tilcdc", },
594 { .compatible = "ti,da850-tilcdc", },
595 { },
596};
597MODULE_DEVICE_TABLE(of, tilcdc_of_match);
598
599static struct platform_driver tilcdc_platform_driver = {
600 .probe = tilcdc_pdev_probe,
601 .remove_new = tilcdc_pdev_remove,
602 .shutdown = tilcdc_pdev_shutdown,
603 .driver = {
604 .name = "tilcdc",
605 .pm = pm_sleep_ptr(&tilcdc_pm_ops),
606 .of_match_table = tilcdc_of_match,
607 },
608};
609
610static int __init tilcdc_drm_init(void)
611{
612 if (drm_firmware_drivers_only())
613 return -ENODEV;
614
615 DBG("init");
616 tilcdc_panel_init();
617 return platform_driver_register(&tilcdc_platform_driver);
618}
619
620static void __exit tilcdc_drm_fini(void)
621{
622 DBG("fini");
623 platform_driver_unregister(&tilcdc_platform_driver);
624 tilcdc_panel_fini();
625}
626
627module_init(tilcdc_drm_init);
628module_exit(tilcdc_drm_fini);
629
630MODULE_AUTHOR("Rob Clark <robdclark@gmail.com");
631MODULE_DESCRIPTION("TI LCD Controller DRM Driver");
632MODULE_LICENSE("GPL");