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_fbdev_generic.h>
23 #include <drm/drm_gem_dma_helper.h>
24 #include <drm/drm_gem_framebuffer_helper.h>
25 #include <drm/drm_module.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 static void atmel_hlcdc_dc_irq_postinstall(struct drm_device *dev)
561 {
562 	struct atmel_hlcdc_dc *dc = dev->dev_private;
563 	unsigned int cfg = 0;
564 	int i;
565 
566 	/* Enable interrupts on activated layers */
567 	for (i = 0; i < ATMEL_HLCDC_MAX_LAYERS; i++) {
568 		if (dc->layers[i])
569 			cfg |= ATMEL_HLCDC_LAYER_STATUS(i);
570 	}
571 
572 	regmap_write(dc->hlcdc->regmap, ATMEL_HLCDC_IER, cfg);
573 }
574 
575 static void atmel_hlcdc_dc_irq_disable(struct drm_device *dev)
576 {
577 	struct atmel_hlcdc_dc *dc = dev->dev_private;
578 	unsigned int isr;
579 
580 	regmap_write(dc->hlcdc->regmap, ATMEL_HLCDC_IDR, 0xffffffff);
581 	regmap_read(dc->hlcdc->regmap, ATMEL_HLCDC_ISR, &isr);
582 }
583 
584 static int atmel_hlcdc_dc_irq_install(struct drm_device *dev, unsigned int irq)
585 {
586 	int ret;
587 
588 	atmel_hlcdc_dc_irq_disable(dev);
589 
590 	ret = devm_request_irq(dev->dev, irq, atmel_hlcdc_dc_irq_handler, 0,
591 			       dev->driver->name, dev);
592 	if (ret)
593 		return ret;
594 
595 	atmel_hlcdc_dc_irq_postinstall(dev);
596 
597 	return 0;
598 }
599 
600 static void atmel_hlcdc_dc_irq_uninstall(struct drm_device *dev)
601 {
602 	atmel_hlcdc_dc_irq_disable(dev);
603 }
604 
605 static const struct drm_mode_config_funcs mode_config_funcs = {
606 	.fb_create = drm_gem_fb_create,
607 	.atomic_check = drm_atomic_helper_check,
608 	.atomic_commit = drm_atomic_helper_commit,
609 };
610 
611 static int atmel_hlcdc_dc_modeset_init(struct drm_device *dev)
612 {
613 	struct atmel_hlcdc_dc *dc = dev->dev_private;
614 	int ret;
615 
616 	drm_mode_config_init(dev);
617 
618 	ret = atmel_hlcdc_create_outputs(dev);
619 	if (ret) {
620 		dev_err(dev->dev, "failed to create HLCDC outputs: %d\n", ret);
621 		return ret;
622 	}
623 
624 	ret = atmel_hlcdc_create_planes(dev);
625 	if (ret) {
626 		dev_err(dev->dev, "failed to create planes: %d\n", ret);
627 		return ret;
628 	}
629 
630 	ret = atmel_hlcdc_crtc_create(dev);
631 	if (ret) {
632 		dev_err(dev->dev, "failed to create crtc\n");
633 		return ret;
634 	}
635 
636 	dev->mode_config.min_width = dc->desc->min_width;
637 	dev->mode_config.min_height = dc->desc->min_height;
638 	dev->mode_config.max_width = dc->desc->max_width;
639 	dev->mode_config.max_height = dc->desc->max_height;
640 	dev->mode_config.funcs = &mode_config_funcs;
641 	dev->mode_config.async_page_flip = true;
642 
643 	return 0;
644 }
645 
646 static int atmel_hlcdc_dc_load(struct drm_device *dev)
647 {
648 	struct platform_device *pdev = to_platform_device(dev->dev);
649 	const struct of_device_id *match;
650 	struct atmel_hlcdc_dc *dc;
651 	int ret;
652 
653 	match = of_match_node(atmel_hlcdc_of_match, dev->dev->parent->of_node);
654 	if (!match) {
655 		dev_err(&pdev->dev, "invalid compatible string\n");
656 		return -ENODEV;
657 	}
658 
659 	if (!match->data) {
660 		dev_err(&pdev->dev, "invalid hlcdc description\n");
661 		return -EINVAL;
662 	}
663 
664 	dc = devm_kzalloc(dev->dev, sizeof(*dc), GFP_KERNEL);
665 	if (!dc)
666 		return -ENOMEM;
667 
668 	dc->desc = match->data;
669 	dc->hlcdc = dev_get_drvdata(dev->dev->parent);
670 	dev->dev_private = dc;
671 
672 	ret = clk_prepare_enable(dc->hlcdc->periph_clk);
673 	if (ret) {
674 		dev_err(dev->dev, "failed to enable periph_clk\n");
675 		return ret;
676 	}
677 
678 	pm_runtime_enable(dev->dev);
679 
680 	ret = drm_vblank_init(dev, 1);
681 	if (ret < 0) {
682 		dev_err(dev->dev, "failed to initialize vblank\n");
683 		goto err_periph_clk_disable;
684 	}
685 
686 	ret = atmel_hlcdc_dc_modeset_init(dev);
687 	if (ret < 0) {
688 		dev_err(dev->dev, "failed to initialize mode setting\n");
689 		goto err_periph_clk_disable;
690 	}
691 
692 	drm_mode_config_reset(dev);
693 
694 	pm_runtime_get_sync(dev->dev);
695 	ret = atmel_hlcdc_dc_irq_install(dev, dc->hlcdc->irq);
696 	pm_runtime_put_sync(dev->dev);
697 	if (ret < 0) {
698 		dev_err(dev->dev, "failed to install IRQ handler\n");
699 		goto err_periph_clk_disable;
700 	}
701 
702 	platform_set_drvdata(pdev, dev);
703 
704 	drm_kms_helper_poll_init(dev);
705 
706 	return 0;
707 
708 err_periph_clk_disable:
709 	pm_runtime_disable(dev->dev);
710 	clk_disable_unprepare(dc->hlcdc->periph_clk);
711 
712 	return ret;
713 }
714 
715 static void atmel_hlcdc_dc_unload(struct drm_device *dev)
716 {
717 	struct atmel_hlcdc_dc *dc = dev->dev_private;
718 
719 	drm_kms_helper_poll_fini(dev);
720 	drm_atomic_helper_shutdown(dev);
721 	drm_mode_config_cleanup(dev);
722 
723 	pm_runtime_get_sync(dev->dev);
724 	atmel_hlcdc_dc_irq_uninstall(dev);
725 	pm_runtime_put_sync(dev->dev);
726 
727 	dev->dev_private = NULL;
728 
729 	pm_runtime_disable(dev->dev);
730 	clk_disable_unprepare(dc->hlcdc->periph_clk);
731 }
732 
733 DEFINE_DRM_GEM_DMA_FOPS(fops);
734 
735 static const struct drm_driver atmel_hlcdc_dc_driver = {
736 	.driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
737 	DRM_GEM_DMA_DRIVER_OPS,
738 	.fops = &fops,
739 	.name = "atmel-hlcdc",
740 	.desc = "Atmel HLCD Controller DRM",
741 	.date = "20141504",
742 	.major = 1,
743 	.minor = 0,
744 };
745 
746 static int atmel_hlcdc_dc_drm_probe(struct platform_device *pdev)
747 {
748 	struct drm_device *ddev;
749 	int ret;
750 
751 	ddev = drm_dev_alloc(&atmel_hlcdc_dc_driver, &pdev->dev);
752 	if (IS_ERR(ddev))
753 		return PTR_ERR(ddev);
754 
755 	ret = atmel_hlcdc_dc_load(ddev);
756 	if (ret)
757 		goto err_put;
758 
759 	ret = drm_dev_register(ddev, 0);
760 	if (ret)
761 		goto err_unload;
762 
763 	drm_fbdev_generic_setup(ddev, 24);
764 
765 	return 0;
766 
767 err_unload:
768 	atmel_hlcdc_dc_unload(ddev);
769 
770 err_put:
771 	drm_dev_put(ddev);
772 
773 	return ret;
774 }
775 
776 static int atmel_hlcdc_dc_drm_remove(struct platform_device *pdev)
777 {
778 	struct drm_device *ddev = platform_get_drvdata(pdev);
779 
780 	drm_dev_unregister(ddev);
781 	atmel_hlcdc_dc_unload(ddev);
782 	drm_dev_put(ddev);
783 
784 	return 0;
785 }
786 
787 #ifdef CONFIG_PM_SLEEP
788 static int atmel_hlcdc_dc_drm_suspend(struct device *dev)
789 {
790 	struct drm_device *drm_dev = dev_get_drvdata(dev);
791 	struct atmel_hlcdc_dc *dc = drm_dev->dev_private;
792 	struct regmap *regmap = dc->hlcdc->regmap;
793 	struct drm_atomic_state *state;
794 
795 	state = drm_atomic_helper_suspend(drm_dev);
796 	if (IS_ERR(state))
797 		return PTR_ERR(state);
798 
799 	dc->suspend.state = state;
800 
801 	regmap_read(regmap, ATMEL_HLCDC_IMR, &dc->suspend.imr);
802 	regmap_write(regmap, ATMEL_HLCDC_IDR, dc->suspend.imr);
803 	clk_disable_unprepare(dc->hlcdc->periph_clk);
804 
805 	return 0;
806 }
807 
808 static int atmel_hlcdc_dc_drm_resume(struct device *dev)
809 {
810 	struct drm_device *drm_dev = dev_get_drvdata(dev);
811 	struct atmel_hlcdc_dc *dc = drm_dev->dev_private;
812 
813 	clk_prepare_enable(dc->hlcdc->periph_clk);
814 	regmap_write(dc->hlcdc->regmap, ATMEL_HLCDC_IER, dc->suspend.imr);
815 
816 	return drm_atomic_helper_resume(drm_dev, dc->suspend.state);
817 }
818 #endif
819 
820 static SIMPLE_DEV_PM_OPS(atmel_hlcdc_dc_drm_pm_ops,
821 		atmel_hlcdc_dc_drm_suspend, atmel_hlcdc_dc_drm_resume);
822 
823 static const struct of_device_id atmel_hlcdc_dc_of_match[] = {
824 	{ .compatible = "atmel,hlcdc-display-controller" },
825 	{ },
826 };
827 
828 static struct platform_driver atmel_hlcdc_dc_platform_driver = {
829 	.probe	= atmel_hlcdc_dc_drm_probe,
830 	.remove	= atmel_hlcdc_dc_drm_remove,
831 	.driver	= {
832 		.name	= "atmel-hlcdc-display-controller",
833 		.pm	= &atmel_hlcdc_dc_drm_pm_ops,
834 		.of_match_table = atmel_hlcdc_dc_of_match,
835 	},
836 };
837 drm_module_platform_driver(atmel_hlcdc_dc_platform_driver);
838 
839 MODULE_AUTHOR("Jean-Jacques Hiblot <jjhiblot@traphandler.com>");
840 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
841 MODULE_DESCRIPTION("Atmel HLCDC Display Controller DRM Driver");
842 MODULE_LICENSE("GPL");
843 MODULE_ALIAS("platform:atmel-hlcdc-dc");
844