1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2014 Traphandler
4  * Copyright (C) 2014 Free Electrons
5  * Copyright (C) 2014 Atmel
6  *
7  * Author: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
8  * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
9  */
10 
11 #include <linux/clk.h>
12 #include <linux/irq.h>
13 #include <linux/irqchip.h>
14 #include <linux/mfd/atmel-hlcdc.h>
15 #include <linux/module.h>
16 #include <linux/pm_runtime.h>
17 #include <linux/platform_device.h>
18 
19 #include <drm/drm_atomic.h>
20 #include <drm/drm_atomic_helper.h>
21 #include <drm/drm_drv.h>
22 #include <drm/drm_fb_helper.h>
23 #include <drm/drm_gem_cma_helper.h>
24 #include <drm/drm_gem_framebuffer_helper.h>
25 #include <drm/drm_irq.h>
26 #include <drm/drm_probe_helper.h>
27 #include <drm/drm_vblank.h>
28 
29 #include "atmel_hlcdc_dc.h"
30 
31 #define ATMEL_HLCDC_LAYER_IRQS_OFFSET		8
32 
33 static const struct atmel_hlcdc_layer_desc atmel_hlcdc_at91sam9n12_layers[] = {
34 	{
35 		.name = "base",
36 		.formats = &atmel_hlcdc_plane_rgb_formats,
37 		.regs_offset = 0x40,
38 		.id = 0,
39 		.type = ATMEL_HLCDC_BASE_LAYER,
40 		.cfgs_offset = 0x2c,
41 		.layout = {
42 			.xstride = { 2 },
43 			.default_color = 3,
44 			.general_config = 4,
45 		},
46 		.clut_offset = 0x400,
47 	},
48 };
49 
50 static const struct atmel_hlcdc_dc_desc atmel_hlcdc_dc_at91sam9n12 = {
51 	.min_width = 0,
52 	.min_height = 0,
53 	.max_width = 1280,
54 	.max_height = 860,
55 	.max_spw = 0x3f,
56 	.max_vpw = 0x3f,
57 	.max_hpw = 0xff,
58 	.conflicting_output_formats = true,
59 	.nlayers = ARRAY_SIZE(atmel_hlcdc_at91sam9n12_layers),
60 	.layers = atmel_hlcdc_at91sam9n12_layers,
61 };
62 
63 static const struct atmel_hlcdc_layer_desc atmel_hlcdc_at91sam9x5_layers[] = {
64 	{
65 		.name = "base",
66 		.formats = &atmel_hlcdc_plane_rgb_formats,
67 		.regs_offset = 0x40,
68 		.id = 0,
69 		.type = ATMEL_HLCDC_BASE_LAYER,
70 		.cfgs_offset = 0x2c,
71 		.layout = {
72 			.xstride = { 2 },
73 			.default_color = 3,
74 			.general_config = 4,
75 			.disc_pos = 5,
76 			.disc_size = 6,
77 		},
78 		.clut_offset = 0x400,
79 	},
80 	{
81 		.name = "overlay1",
82 		.formats = &atmel_hlcdc_plane_rgb_formats,
83 		.regs_offset = 0x100,
84 		.id = 1,
85 		.type = ATMEL_HLCDC_OVERLAY_LAYER,
86 		.cfgs_offset = 0x2c,
87 		.layout = {
88 			.pos = 2,
89 			.size = 3,
90 			.xstride = { 4 },
91 			.pstride = { 5 },
92 			.default_color = 6,
93 			.chroma_key = 7,
94 			.chroma_key_mask = 8,
95 			.general_config = 9,
96 		},
97 		.clut_offset = 0x800,
98 	},
99 	{
100 		.name = "high-end-overlay",
101 		.formats = &atmel_hlcdc_plane_rgb_and_yuv_formats,
102 		.regs_offset = 0x280,
103 		.id = 2,
104 		.type = ATMEL_HLCDC_OVERLAY_LAYER,
105 		.cfgs_offset = 0x4c,
106 		.layout = {
107 			.pos = 2,
108 			.size = 3,
109 			.memsize = 4,
110 			.xstride = { 5, 7 },
111 			.pstride = { 6, 8 },
112 			.default_color = 9,
113 			.chroma_key = 10,
114 			.chroma_key_mask = 11,
115 			.general_config = 12,
116 			.scaler_config = 13,
117 			.csc = 14,
118 		},
119 		.clut_offset = 0x1000,
120 	},
121 	{
122 		.name = "cursor",
123 		.formats = &atmel_hlcdc_plane_rgb_formats,
124 		.regs_offset = 0x340,
125 		.id = 3,
126 		.type = ATMEL_HLCDC_CURSOR_LAYER,
127 		.max_width = 128,
128 		.max_height = 128,
129 		.cfgs_offset = 0x2c,
130 		.layout = {
131 			.pos = 2,
132 			.size = 3,
133 			.xstride = { 4 },
134 			.default_color = 6,
135 			.chroma_key = 7,
136 			.chroma_key_mask = 8,
137 			.general_config = 9,
138 		},
139 		.clut_offset = 0x1400,
140 	},
141 };
142 
143 static const struct atmel_hlcdc_dc_desc atmel_hlcdc_dc_at91sam9x5 = {
144 	.min_width = 0,
145 	.min_height = 0,
146 	.max_width = 800,
147 	.max_height = 600,
148 	.max_spw = 0x3f,
149 	.max_vpw = 0x3f,
150 	.max_hpw = 0xff,
151 	.conflicting_output_formats = true,
152 	.nlayers = ARRAY_SIZE(atmel_hlcdc_at91sam9x5_layers),
153 	.layers = atmel_hlcdc_at91sam9x5_layers,
154 };
155 
156 static const struct atmel_hlcdc_layer_desc atmel_hlcdc_sama5d3_layers[] = {
157 	{
158 		.name = "base",
159 		.formats = &atmel_hlcdc_plane_rgb_formats,
160 		.regs_offset = 0x40,
161 		.id = 0,
162 		.type = ATMEL_HLCDC_BASE_LAYER,
163 		.cfgs_offset = 0x2c,
164 		.layout = {
165 			.xstride = { 2 },
166 			.default_color = 3,
167 			.general_config = 4,
168 			.disc_pos = 5,
169 			.disc_size = 6,
170 		},
171 		.clut_offset = 0x600,
172 	},
173 	{
174 		.name = "overlay1",
175 		.formats = &atmel_hlcdc_plane_rgb_formats,
176 		.regs_offset = 0x140,
177 		.id = 1,
178 		.type = ATMEL_HLCDC_OVERLAY_LAYER,
179 		.cfgs_offset = 0x2c,
180 		.layout = {
181 			.pos = 2,
182 			.size = 3,
183 			.xstride = { 4 },
184 			.pstride = { 5 },
185 			.default_color = 6,
186 			.chroma_key = 7,
187 			.chroma_key_mask = 8,
188 			.general_config = 9,
189 		},
190 		.clut_offset = 0xa00,
191 	},
192 	{
193 		.name = "overlay2",
194 		.formats = &atmel_hlcdc_plane_rgb_formats,
195 		.regs_offset = 0x240,
196 		.id = 2,
197 		.type = ATMEL_HLCDC_OVERLAY_LAYER,
198 		.cfgs_offset = 0x2c,
199 		.layout = {
200 			.pos = 2,
201 			.size = 3,
202 			.xstride = { 4 },
203 			.pstride = { 5 },
204 			.default_color = 6,
205 			.chroma_key = 7,
206 			.chroma_key_mask = 8,
207 			.general_config = 9,
208 		},
209 		.clut_offset = 0xe00,
210 	},
211 	{
212 		.name = "high-end-overlay",
213 		.formats = &atmel_hlcdc_plane_rgb_and_yuv_formats,
214 		.regs_offset = 0x340,
215 		.id = 3,
216 		.type = ATMEL_HLCDC_OVERLAY_LAYER,
217 		.cfgs_offset = 0x4c,
218 		.layout = {
219 			.pos = 2,
220 			.size = 3,
221 			.memsize = 4,
222 			.xstride = { 5, 7 },
223 			.pstride = { 6, 8 },
224 			.default_color = 9,
225 			.chroma_key = 10,
226 			.chroma_key_mask = 11,
227 			.general_config = 12,
228 			.scaler_config = 13,
229 			.phicoeffs = {
230 				.x = 17,
231 				.y = 33,
232 			},
233 			.csc = 14,
234 		},
235 		.clut_offset = 0x1200,
236 	},
237 	{
238 		.name = "cursor",
239 		.formats = &atmel_hlcdc_plane_rgb_formats,
240 		.regs_offset = 0x440,
241 		.id = 4,
242 		.type = ATMEL_HLCDC_CURSOR_LAYER,
243 		.max_width = 128,
244 		.max_height = 128,
245 		.cfgs_offset = 0x2c,
246 		.layout = {
247 			.pos = 2,
248 			.size = 3,
249 			.xstride = { 4 },
250 			.pstride = { 5 },
251 			.default_color = 6,
252 			.chroma_key = 7,
253 			.chroma_key_mask = 8,
254 			.general_config = 9,
255 			.scaler_config = 13,
256 		},
257 		.clut_offset = 0x1600,
258 	},
259 };
260 
261 static const struct atmel_hlcdc_dc_desc atmel_hlcdc_dc_sama5d3 = {
262 	.min_width = 0,
263 	.min_height = 0,
264 	.max_width = 2048,
265 	.max_height = 2048,
266 	.max_spw = 0x3f,
267 	.max_vpw = 0x3f,
268 	.max_hpw = 0x1ff,
269 	.conflicting_output_formats = true,
270 	.nlayers = ARRAY_SIZE(atmel_hlcdc_sama5d3_layers),
271 	.layers = atmel_hlcdc_sama5d3_layers,
272 };
273 
274 static const struct atmel_hlcdc_layer_desc atmel_hlcdc_sama5d4_layers[] = {
275 	{
276 		.name = "base",
277 		.formats = &atmel_hlcdc_plane_rgb_formats,
278 		.regs_offset = 0x40,
279 		.id = 0,
280 		.type = ATMEL_HLCDC_BASE_LAYER,
281 		.cfgs_offset = 0x2c,
282 		.layout = {
283 			.xstride = { 2 },
284 			.default_color = 3,
285 			.general_config = 4,
286 			.disc_pos = 5,
287 			.disc_size = 6,
288 		},
289 		.clut_offset = 0x600,
290 	},
291 	{
292 		.name = "overlay1",
293 		.formats = &atmel_hlcdc_plane_rgb_formats,
294 		.regs_offset = 0x140,
295 		.id = 1,
296 		.type = ATMEL_HLCDC_OVERLAY_LAYER,
297 		.cfgs_offset = 0x2c,
298 		.layout = {
299 			.pos = 2,
300 			.size = 3,
301 			.xstride = { 4 },
302 			.pstride = { 5 },
303 			.default_color = 6,
304 			.chroma_key = 7,
305 			.chroma_key_mask = 8,
306 			.general_config = 9,
307 		},
308 		.clut_offset = 0xa00,
309 	},
310 	{
311 		.name = "overlay2",
312 		.formats = &atmel_hlcdc_plane_rgb_formats,
313 		.regs_offset = 0x240,
314 		.id = 2,
315 		.type = ATMEL_HLCDC_OVERLAY_LAYER,
316 		.cfgs_offset = 0x2c,
317 		.layout = {
318 			.pos = 2,
319 			.size = 3,
320 			.xstride = { 4 },
321 			.pstride = { 5 },
322 			.default_color = 6,
323 			.chroma_key = 7,
324 			.chroma_key_mask = 8,
325 			.general_config = 9,
326 		},
327 		.clut_offset = 0xe00,
328 	},
329 	{
330 		.name = "high-end-overlay",
331 		.formats = &atmel_hlcdc_plane_rgb_and_yuv_formats,
332 		.regs_offset = 0x340,
333 		.id = 3,
334 		.type = ATMEL_HLCDC_OVERLAY_LAYER,
335 		.cfgs_offset = 0x4c,
336 		.layout = {
337 			.pos = 2,
338 			.size = 3,
339 			.memsize = 4,
340 			.xstride = { 5, 7 },
341 			.pstride = { 6, 8 },
342 			.default_color = 9,
343 			.chroma_key = 10,
344 			.chroma_key_mask = 11,
345 			.general_config = 12,
346 			.scaler_config = 13,
347 			.phicoeffs = {
348 				.x = 17,
349 				.y = 33,
350 			},
351 			.csc = 14,
352 		},
353 		.clut_offset = 0x1200,
354 	},
355 };
356 
357 static const struct atmel_hlcdc_dc_desc atmel_hlcdc_dc_sama5d4 = {
358 	.min_width = 0,
359 	.min_height = 0,
360 	.max_width = 2048,
361 	.max_height = 2048,
362 	.max_spw = 0xff,
363 	.max_vpw = 0xff,
364 	.max_hpw = 0x3ff,
365 	.nlayers = ARRAY_SIZE(atmel_hlcdc_sama5d4_layers),
366 	.layers = atmel_hlcdc_sama5d4_layers,
367 };
368 
369 static const struct atmel_hlcdc_layer_desc atmel_hlcdc_sam9x60_layers[] = {
370 	{
371 		.name = "base",
372 		.formats = &atmel_hlcdc_plane_rgb_formats,
373 		.regs_offset = 0x60,
374 		.id = 0,
375 		.type = ATMEL_HLCDC_BASE_LAYER,
376 		.cfgs_offset = 0x2c,
377 		.layout = {
378 			.xstride = { 2 },
379 			.default_color = 3,
380 			.general_config = 4,
381 			.disc_pos = 5,
382 			.disc_size = 6,
383 		},
384 		.clut_offset = 0x600,
385 	},
386 	{
387 		.name = "overlay1",
388 		.formats = &atmel_hlcdc_plane_rgb_formats,
389 		.regs_offset = 0x160,
390 		.id = 1,
391 		.type = ATMEL_HLCDC_OVERLAY_LAYER,
392 		.cfgs_offset = 0x2c,
393 		.layout = {
394 			.pos = 2,
395 			.size = 3,
396 			.xstride = { 4 },
397 			.pstride = { 5 },
398 			.default_color = 6,
399 			.chroma_key = 7,
400 			.chroma_key_mask = 8,
401 			.general_config = 9,
402 		},
403 		.clut_offset = 0xa00,
404 	},
405 	{
406 		.name = "overlay2",
407 		.formats = &atmel_hlcdc_plane_rgb_formats,
408 		.regs_offset = 0x260,
409 		.id = 2,
410 		.type = ATMEL_HLCDC_OVERLAY_LAYER,
411 		.cfgs_offset = 0x2c,
412 		.layout = {
413 			.pos = 2,
414 			.size = 3,
415 			.xstride = { 4 },
416 			.pstride = { 5 },
417 			.default_color = 6,
418 			.chroma_key = 7,
419 			.chroma_key_mask = 8,
420 			.general_config = 9,
421 		},
422 		.clut_offset = 0xe00,
423 	},
424 	{
425 		.name = "high-end-overlay",
426 		.formats = &atmel_hlcdc_plane_rgb_and_yuv_formats,
427 		.regs_offset = 0x360,
428 		.id = 3,
429 		.type = ATMEL_HLCDC_OVERLAY_LAYER,
430 		.cfgs_offset = 0x4c,
431 		.layout = {
432 			.pos = 2,
433 			.size = 3,
434 			.memsize = 4,
435 			.xstride = { 5, 7 },
436 			.pstride = { 6, 8 },
437 			.default_color = 9,
438 			.chroma_key = 10,
439 			.chroma_key_mask = 11,
440 			.general_config = 12,
441 			.scaler_config = 13,
442 			.phicoeffs = {
443 				.x = 17,
444 				.y = 33,
445 			},
446 			.csc = 14,
447 		},
448 		.clut_offset = 0x1200,
449 	},
450 };
451 
452 static const struct atmel_hlcdc_dc_desc atmel_hlcdc_dc_sam9x60 = {
453 	.min_width = 0,
454 	.min_height = 0,
455 	.max_width = 2048,
456 	.max_height = 2048,
457 	.max_spw = 0xff,
458 	.max_vpw = 0xff,
459 	.max_hpw = 0x3ff,
460 	.fixed_clksrc = true,
461 	.nlayers = ARRAY_SIZE(atmel_hlcdc_sam9x60_layers),
462 	.layers = atmel_hlcdc_sam9x60_layers,
463 };
464 
465 static const struct of_device_id atmel_hlcdc_of_match[] = {
466 	{
467 		.compatible = "atmel,at91sam9n12-hlcdc",
468 		.data = &atmel_hlcdc_dc_at91sam9n12,
469 	},
470 	{
471 		.compatible = "atmel,at91sam9x5-hlcdc",
472 		.data = &atmel_hlcdc_dc_at91sam9x5,
473 	},
474 	{
475 		.compatible = "atmel,sama5d2-hlcdc",
476 		.data = &atmel_hlcdc_dc_sama5d4,
477 	},
478 	{
479 		.compatible = "atmel,sama5d3-hlcdc",
480 		.data = &atmel_hlcdc_dc_sama5d3,
481 	},
482 	{
483 		.compatible = "atmel,sama5d4-hlcdc",
484 		.data = &atmel_hlcdc_dc_sama5d4,
485 	},
486 	{
487 		.compatible = "microchip,sam9x60-hlcdc",
488 		.data = &atmel_hlcdc_dc_sam9x60,
489 	},
490 	{ /* sentinel */ },
491 };
492 MODULE_DEVICE_TABLE(of, atmel_hlcdc_of_match);
493 
494 enum drm_mode_status
495 atmel_hlcdc_dc_mode_valid(struct atmel_hlcdc_dc *dc,
496 			  const struct drm_display_mode *mode)
497 {
498 	int vfront_porch = mode->vsync_start - mode->vdisplay;
499 	int vback_porch = mode->vtotal - mode->vsync_end;
500 	int vsync_len = mode->vsync_end - mode->vsync_start;
501 	int hfront_porch = mode->hsync_start - mode->hdisplay;
502 	int hback_porch = mode->htotal - mode->hsync_end;
503 	int hsync_len = mode->hsync_end - mode->hsync_start;
504 
505 	if (hsync_len > dc->desc->max_spw + 1 || hsync_len < 1)
506 		return MODE_HSYNC;
507 
508 	if (vsync_len > dc->desc->max_spw + 1 || vsync_len < 1)
509 		return MODE_VSYNC;
510 
511 	if (hfront_porch > dc->desc->max_hpw + 1 || hfront_porch < 1 ||
512 	    hback_porch > dc->desc->max_hpw + 1 || hback_porch < 1 ||
513 	    mode->hdisplay < 1)
514 		return MODE_H_ILLEGAL;
515 
516 	if (vfront_porch > dc->desc->max_vpw + 1 || vfront_porch < 1 ||
517 	    vback_porch > dc->desc->max_vpw || vback_porch < 0 ||
518 	    mode->vdisplay < 1)
519 		return MODE_V_ILLEGAL;
520 
521 	return MODE_OK;
522 }
523 
524 static void atmel_hlcdc_layer_irq(struct atmel_hlcdc_layer *layer)
525 {
526 	if (!layer)
527 		return;
528 
529 	if (layer->desc->type == ATMEL_HLCDC_BASE_LAYER ||
530 	    layer->desc->type == ATMEL_HLCDC_OVERLAY_LAYER ||
531 	    layer->desc->type == ATMEL_HLCDC_CURSOR_LAYER)
532 		atmel_hlcdc_plane_irq(atmel_hlcdc_layer_to_plane(layer));
533 }
534 
535 static irqreturn_t atmel_hlcdc_dc_irq_handler(int irq, void *data)
536 {
537 	struct drm_device *dev = data;
538 	struct atmel_hlcdc_dc *dc = dev->dev_private;
539 	unsigned long status;
540 	unsigned int imr, isr;
541 	int i;
542 
543 	regmap_read(dc->hlcdc->regmap, ATMEL_HLCDC_IMR, &imr);
544 	regmap_read(dc->hlcdc->regmap, ATMEL_HLCDC_ISR, &isr);
545 	status = imr & isr;
546 	if (!status)
547 		return IRQ_NONE;
548 
549 	if (status & ATMEL_HLCDC_SOF)
550 		atmel_hlcdc_crtc_irq(dc->crtc);
551 
552 	for (i = 0; i < ATMEL_HLCDC_MAX_LAYERS; i++) {
553 		if (ATMEL_HLCDC_LAYER_STATUS(i) & status)
554 			atmel_hlcdc_layer_irq(dc->layers[i]);
555 	}
556 
557 	return IRQ_HANDLED;
558 }
559 
560 struct atmel_hlcdc_dc_commit {
561 	struct work_struct work;
562 	struct drm_device *dev;
563 	struct drm_atomic_state *state;
564 };
565 
566 static void
567 atmel_hlcdc_dc_atomic_complete(struct atmel_hlcdc_dc_commit *commit)
568 {
569 	struct drm_device *dev = commit->dev;
570 	struct atmel_hlcdc_dc *dc = dev->dev_private;
571 	struct drm_atomic_state *old_state = commit->state;
572 
573 	/* Apply the atomic update. */
574 	drm_atomic_helper_commit_modeset_disables(dev, old_state);
575 	drm_atomic_helper_commit_planes(dev, old_state, 0);
576 	drm_atomic_helper_commit_modeset_enables(dev, old_state);
577 
578 	drm_atomic_helper_wait_for_vblanks(dev, old_state);
579 
580 	drm_atomic_helper_cleanup_planes(dev, old_state);
581 
582 	drm_atomic_state_put(old_state);
583 
584 	/* Complete the commit, wake up any waiter. */
585 	spin_lock(&dc->commit.wait.lock);
586 	dc->commit.pending = false;
587 	wake_up_all_locked(&dc->commit.wait);
588 	spin_unlock(&dc->commit.wait.lock);
589 
590 	kfree(commit);
591 }
592 
593 static void atmel_hlcdc_dc_atomic_work(struct work_struct *work)
594 {
595 	struct atmel_hlcdc_dc_commit *commit =
596 		container_of(work, struct atmel_hlcdc_dc_commit, work);
597 
598 	atmel_hlcdc_dc_atomic_complete(commit);
599 }
600 
601 static int atmel_hlcdc_dc_atomic_commit(struct drm_device *dev,
602 					struct drm_atomic_state *state,
603 					bool async)
604 {
605 	struct atmel_hlcdc_dc *dc = dev->dev_private;
606 	struct atmel_hlcdc_dc_commit *commit;
607 	int ret;
608 
609 	ret = drm_atomic_helper_prepare_planes(dev, state);
610 	if (ret)
611 		return ret;
612 
613 	/* Allocate the commit object. */
614 	commit = kzalloc(sizeof(*commit), GFP_KERNEL);
615 	if (!commit) {
616 		ret = -ENOMEM;
617 		goto error;
618 	}
619 
620 	INIT_WORK(&commit->work, atmel_hlcdc_dc_atomic_work);
621 	commit->dev = dev;
622 	commit->state = state;
623 
624 	spin_lock(&dc->commit.wait.lock);
625 	ret = wait_event_interruptible_locked(dc->commit.wait,
626 					      !dc->commit.pending);
627 	if (ret == 0)
628 		dc->commit.pending = true;
629 	spin_unlock(&dc->commit.wait.lock);
630 
631 	if (ret)
632 		goto err_free;
633 
634 	/* We have our own synchronization through the commit lock. */
635 	BUG_ON(drm_atomic_helper_swap_state(state, false) < 0);
636 
637 	/* Swap state succeeded, this is the point of no return. */
638 	drm_atomic_state_get(state);
639 	if (async)
640 		queue_work(dc->wq, &commit->work);
641 	else
642 		atmel_hlcdc_dc_atomic_complete(commit);
643 
644 	return 0;
645 
646 err_free:
647 	kfree(commit);
648 error:
649 	drm_atomic_helper_cleanup_planes(dev, state);
650 	return ret;
651 }
652 
653 static const struct drm_mode_config_funcs mode_config_funcs = {
654 	.fb_create = drm_gem_fb_create,
655 	.atomic_check = drm_atomic_helper_check,
656 	.atomic_commit = atmel_hlcdc_dc_atomic_commit,
657 };
658 
659 static int atmel_hlcdc_dc_modeset_init(struct drm_device *dev)
660 {
661 	struct atmel_hlcdc_dc *dc = dev->dev_private;
662 	int ret;
663 
664 	drm_mode_config_init(dev);
665 
666 	ret = atmel_hlcdc_create_outputs(dev);
667 	if (ret) {
668 		dev_err(dev->dev, "failed to create HLCDC outputs: %d\n", ret);
669 		return ret;
670 	}
671 
672 	ret = atmel_hlcdc_create_planes(dev);
673 	if (ret) {
674 		dev_err(dev->dev, "failed to create planes: %d\n", ret);
675 		return ret;
676 	}
677 
678 	ret = atmel_hlcdc_crtc_create(dev);
679 	if (ret) {
680 		dev_err(dev->dev, "failed to create crtc\n");
681 		return ret;
682 	}
683 
684 	dev->mode_config.min_width = dc->desc->min_width;
685 	dev->mode_config.min_height = dc->desc->min_height;
686 	dev->mode_config.max_width = dc->desc->max_width;
687 	dev->mode_config.max_height = dc->desc->max_height;
688 	dev->mode_config.funcs = &mode_config_funcs;
689 
690 	return 0;
691 }
692 
693 static int atmel_hlcdc_dc_load(struct drm_device *dev)
694 {
695 	struct platform_device *pdev = to_platform_device(dev->dev);
696 	const struct of_device_id *match;
697 	struct atmel_hlcdc_dc *dc;
698 	int ret;
699 
700 	match = of_match_node(atmel_hlcdc_of_match, dev->dev->parent->of_node);
701 	if (!match) {
702 		dev_err(&pdev->dev, "invalid compatible string\n");
703 		return -ENODEV;
704 	}
705 
706 	if (!match->data) {
707 		dev_err(&pdev->dev, "invalid hlcdc description\n");
708 		return -EINVAL;
709 	}
710 
711 	dc = devm_kzalloc(dev->dev, sizeof(*dc), GFP_KERNEL);
712 	if (!dc)
713 		return -ENOMEM;
714 
715 	dc->wq = alloc_ordered_workqueue("atmel-hlcdc-dc", 0);
716 	if (!dc->wq)
717 		return -ENOMEM;
718 
719 	init_waitqueue_head(&dc->commit.wait);
720 	dc->desc = match->data;
721 	dc->hlcdc = dev_get_drvdata(dev->dev->parent);
722 	dev->dev_private = dc;
723 
724 	ret = clk_prepare_enable(dc->hlcdc->periph_clk);
725 	if (ret) {
726 		dev_err(dev->dev, "failed to enable periph_clk\n");
727 		goto err_destroy_wq;
728 	}
729 
730 	pm_runtime_enable(dev->dev);
731 
732 	ret = drm_vblank_init(dev, 1);
733 	if (ret < 0) {
734 		dev_err(dev->dev, "failed to initialize vblank\n");
735 		goto err_periph_clk_disable;
736 	}
737 
738 	ret = atmel_hlcdc_dc_modeset_init(dev);
739 	if (ret < 0) {
740 		dev_err(dev->dev, "failed to initialize mode setting\n");
741 		goto err_periph_clk_disable;
742 	}
743 
744 	drm_mode_config_reset(dev);
745 
746 	pm_runtime_get_sync(dev->dev);
747 	ret = drm_irq_install(dev, dc->hlcdc->irq);
748 	pm_runtime_put_sync(dev->dev);
749 	if (ret < 0) {
750 		dev_err(dev->dev, "failed to install IRQ handler\n");
751 		goto err_periph_clk_disable;
752 	}
753 
754 	platform_set_drvdata(pdev, dev);
755 
756 	drm_kms_helper_poll_init(dev);
757 
758 	return 0;
759 
760 err_periph_clk_disable:
761 	pm_runtime_disable(dev->dev);
762 	clk_disable_unprepare(dc->hlcdc->periph_clk);
763 
764 err_destroy_wq:
765 	destroy_workqueue(dc->wq);
766 
767 	return ret;
768 }
769 
770 static void atmel_hlcdc_dc_unload(struct drm_device *dev)
771 {
772 	struct atmel_hlcdc_dc *dc = dev->dev_private;
773 
774 	flush_workqueue(dc->wq);
775 	drm_kms_helper_poll_fini(dev);
776 	drm_atomic_helper_shutdown(dev);
777 	drm_mode_config_cleanup(dev);
778 
779 	pm_runtime_get_sync(dev->dev);
780 	drm_irq_uninstall(dev);
781 	pm_runtime_put_sync(dev->dev);
782 
783 	dev->dev_private = NULL;
784 
785 	pm_runtime_disable(dev->dev);
786 	clk_disable_unprepare(dc->hlcdc->periph_clk);
787 	destroy_workqueue(dc->wq);
788 }
789 
790 static int atmel_hlcdc_dc_irq_postinstall(struct drm_device *dev)
791 {
792 	struct atmel_hlcdc_dc *dc = dev->dev_private;
793 	unsigned int cfg = 0;
794 	int i;
795 
796 	/* Enable interrupts on activated layers */
797 	for (i = 0; i < ATMEL_HLCDC_MAX_LAYERS; i++) {
798 		if (dc->layers[i])
799 			cfg |= ATMEL_HLCDC_LAYER_STATUS(i);
800 	}
801 
802 	regmap_write(dc->hlcdc->regmap, ATMEL_HLCDC_IER, cfg);
803 
804 	return 0;
805 }
806 
807 static void atmel_hlcdc_dc_irq_uninstall(struct drm_device *dev)
808 {
809 	struct atmel_hlcdc_dc *dc = dev->dev_private;
810 	unsigned int isr;
811 
812 	regmap_write(dc->hlcdc->regmap, ATMEL_HLCDC_IDR, 0xffffffff);
813 	regmap_read(dc->hlcdc->regmap, ATMEL_HLCDC_ISR, &isr);
814 }
815 
816 DEFINE_DRM_GEM_CMA_FOPS(fops);
817 
818 static const struct drm_driver atmel_hlcdc_dc_driver = {
819 	.driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
820 	.irq_handler = atmel_hlcdc_dc_irq_handler,
821 	.irq_preinstall = atmel_hlcdc_dc_irq_uninstall,
822 	.irq_postinstall = atmel_hlcdc_dc_irq_postinstall,
823 	.irq_uninstall = atmel_hlcdc_dc_irq_uninstall,
824 	DRM_GEM_CMA_DRIVER_OPS,
825 	.fops = &fops,
826 	.name = "atmel-hlcdc",
827 	.desc = "Atmel HLCD Controller DRM",
828 	.date = "20141504",
829 	.major = 1,
830 	.minor = 0,
831 };
832 
833 static int atmel_hlcdc_dc_drm_probe(struct platform_device *pdev)
834 {
835 	struct drm_device *ddev;
836 	int ret;
837 
838 	ddev = drm_dev_alloc(&atmel_hlcdc_dc_driver, &pdev->dev);
839 	if (IS_ERR(ddev))
840 		return PTR_ERR(ddev);
841 
842 	ret = atmel_hlcdc_dc_load(ddev);
843 	if (ret)
844 		goto err_put;
845 
846 	ret = drm_dev_register(ddev, 0);
847 	if (ret)
848 		goto err_unload;
849 
850 	drm_fbdev_generic_setup(ddev, 24);
851 
852 	return 0;
853 
854 err_unload:
855 	atmel_hlcdc_dc_unload(ddev);
856 
857 err_put:
858 	drm_dev_put(ddev);
859 
860 	return ret;
861 }
862 
863 static int atmel_hlcdc_dc_drm_remove(struct platform_device *pdev)
864 {
865 	struct drm_device *ddev = platform_get_drvdata(pdev);
866 
867 	drm_dev_unregister(ddev);
868 	atmel_hlcdc_dc_unload(ddev);
869 	drm_dev_put(ddev);
870 
871 	return 0;
872 }
873 
874 #ifdef CONFIG_PM_SLEEP
875 static int atmel_hlcdc_dc_drm_suspend(struct device *dev)
876 {
877 	struct drm_device *drm_dev = dev_get_drvdata(dev);
878 	struct atmel_hlcdc_dc *dc = drm_dev->dev_private;
879 	struct regmap *regmap = dc->hlcdc->regmap;
880 	struct drm_atomic_state *state;
881 
882 	state = drm_atomic_helper_suspend(drm_dev);
883 	if (IS_ERR(state))
884 		return PTR_ERR(state);
885 
886 	dc->suspend.state = state;
887 
888 	regmap_read(regmap, ATMEL_HLCDC_IMR, &dc->suspend.imr);
889 	regmap_write(regmap, ATMEL_HLCDC_IDR, dc->suspend.imr);
890 	clk_disable_unprepare(dc->hlcdc->periph_clk);
891 
892 	return 0;
893 }
894 
895 static int atmel_hlcdc_dc_drm_resume(struct device *dev)
896 {
897 	struct drm_device *drm_dev = dev_get_drvdata(dev);
898 	struct atmel_hlcdc_dc *dc = drm_dev->dev_private;
899 
900 	clk_prepare_enable(dc->hlcdc->periph_clk);
901 	regmap_write(dc->hlcdc->regmap, ATMEL_HLCDC_IER, dc->suspend.imr);
902 
903 	return drm_atomic_helper_resume(drm_dev, dc->suspend.state);
904 }
905 #endif
906 
907 static SIMPLE_DEV_PM_OPS(atmel_hlcdc_dc_drm_pm_ops,
908 		atmel_hlcdc_dc_drm_suspend, atmel_hlcdc_dc_drm_resume);
909 
910 static const struct of_device_id atmel_hlcdc_dc_of_match[] = {
911 	{ .compatible = "atmel,hlcdc-display-controller" },
912 	{ },
913 };
914 
915 static struct platform_driver atmel_hlcdc_dc_platform_driver = {
916 	.probe	= atmel_hlcdc_dc_drm_probe,
917 	.remove	= atmel_hlcdc_dc_drm_remove,
918 	.driver	= {
919 		.name	= "atmel-hlcdc-display-controller",
920 		.pm	= &atmel_hlcdc_dc_drm_pm_ops,
921 		.of_match_table = atmel_hlcdc_dc_of_match,
922 	},
923 };
924 module_platform_driver(atmel_hlcdc_dc_platform_driver);
925 
926 MODULE_AUTHOR("Jean-Jacques Hiblot <jjhiblot@traphandler.com>");
927 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
928 MODULE_DESCRIPTION("Atmel HLCDC Display Controller DRM Driver");
929 MODULE_LICENSE("GPL");
930 MODULE_ALIAS("platform:atmel-hlcdc-dc");
931