1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * NVIDIA Tegra Video decoder driver
4  *
5  * Copyright (C) 2016-2017 Dmitry Osipenko <digetx@gmail.com>
6  *
7  */
8 
9 #include <linux/clk.h>
10 #include <linux/dma-buf.h>
11 #include <linux/genalloc.h>
12 #include <linux/interrupt.h>
13 #include <linux/list.h>
14 #include <linux/module.h>
15 #include <linux/of_device.h>
16 #include <linux/pm_runtime.h>
17 #include <linux/reset.h>
18 #include <linux/slab.h>
19 #include <linux/uaccess.h>
20 
21 #include <soc/tegra/common.h>
22 #include <soc/tegra/pmc.h>
23 
24 #include "vde.h"
25 
26 #define CREATE_TRACE_POINTS
27 #include "trace.h"
28 
29 void tegra_vde_writel(struct tegra_vde *vde, u32 value,
30 		      void __iomem *base, u32 offset)
31 {
32 	trace_vde_writel(vde, base, offset, value);
33 
34 	writel_relaxed(value, base + offset);
35 }
36 
37 u32 tegra_vde_readl(struct tegra_vde *vde, void __iomem *base, u32 offset)
38 {
39 	u32 value = readl_relaxed(base + offset);
40 
41 	trace_vde_readl(vde, base, offset, value);
42 
43 	return value;
44 }
45 
46 void tegra_vde_set_bits(struct tegra_vde *vde, u32 mask,
47 			void __iomem *base, u32 offset)
48 {
49 	u32 value = tegra_vde_readl(vde, base, offset);
50 
51 	tegra_vde_writel(vde, value | mask, base, offset);
52 }
53 
54 int tegra_vde_alloc_bo(struct tegra_vde *vde,
55 		       struct tegra_vde_bo **ret_bo,
56 		       enum dma_data_direction dma_dir,
57 		       size_t size)
58 {
59 	struct device *dev = vde->dev;
60 	struct tegra_vde_bo *bo;
61 	int err;
62 
63 	bo = kzalloc(sizeof(*bo), GFP_KERNEL);
64 	if (!bo)
65 		return -ENOMEM;
66 
67 	bo->vde = vde;
68 	bo->size = size;
69 	bo->dma_dir = dma_dir;
70 	bo->dma_attrs = DMA_ATTR_WRITE_COMBINE |
71 			DMA_ATTR_NO_KERNEL_MAPPING;
72 
73 	if (!vde->domain)
74 		bo->dma_attrs |= DMA_ATTR_FORCE_CONTIGUOUS;
75 
76 	bo->dma_cookie = dma_alloc_attrs(dev, bo->size, &bo->dma_handle,
77 					 GFP_KERNEL, bo->dma_attrs);
78 	if (!bo->dma_cookie) {
79 		dev_err(dev, "Failed to allocate DMA buffer of size: %zu\n",
80 			bo->size);
81 		err = -ENOMEM;
82 		goto free_bo;
83 	}
84 
85 	err = dma_get_sgtable_attrs(dev, &bo->sgt, bo->dma_cookie,
86 				    bo->dma_handle, bo->size, bo->dma_attrs);
87 	if (err) {
88 		dev_err(dev, "Failed to get DMA buffer SG table: %d\n", err);
89 		goto free_attrs;
90 	}
91 
92 	err = dma_map_sgtable(dev, &bo->sgt, bo->dma_dir, bo->dma_attrs);
93 	if (err) {
94 		dev_err(dev, "Failed to map DMA buffer SG table: %d\n", err);
95 		goto free_table;
96 	}
97 
98 	if (vde->domain) {
99 		err = tegra_vde_iommu_map(vde, &bo->sgt, &bo->iova, bo->size);
100 		if (err) {
101 			dev_err(dev, "Failed to map DMA buffer IOVA: %d\n", err);
102 			goto unmap_sgtable;
103 		}
104 
105 		bo->dma_addr = iova_dma_addr(&vde->iova, bo->iova);
106 	} else {
107 		bo->dma_addr = sg_dma_address(bo->sgt.sgl);
108 	}
109 
110 	*ret_bo = bo;
111 
112 	return 0;
113 
114 unmap_sgtable:
115 	dma_unmap_sgtable(dev, &bo->sgt, bo->dma_dir, bo->dma_attrs);
116 free_table:
117 	sg_free_table(&bo->sgt);
118 free_attrs:
119 	dma_free_attrs(dev, bo->size, bo->dma_cookie, bo->dma_handle,
120 		       bo->dma_attrs);
121 free_bo:
122 	kfree(bo);
123 
124 	return err;
125 }
126 
127 void tegra_vde_free_bo(struct tegra_vde_bo *bo)
128 {
129 	struct tegra_vde *vde = bo->vde;
130 	struct device *dev = vde->dev;
131 
132 	if (vde->domain)
133 		tegra_vde_iommu_unmap(vde, bo->iova);
134 
135 	dma_unmap_sgtable(dev, &bo->sgt, bo->dma_dir, bo->dma_attrs);
136 
137 	sg_free_table(&bo->sgt);
138 
139 	dma_free_attrs(dev, bo->size, bo->dma_cookie, bo->dma_handle,
140 		       bo->dma_attrs);
141 	kfree(bo);
142 }
143 
144 static irqreturn_t tegra_vde_isr(int irq, void *data)
145 {
146 	struct tegra_vde *vde = data;
147 
148 	if (completion_done(&vde->decode_completion))
149 		return IRQ_NONE;
150 
151 	tegra_vde_set_bits(vde, 0, vde->frameid, 0x208);
152 	complete(&vde->decode_completion);
153 
154 	return IRQ_HANDLED;
155 }
156 
157 static __maybe_unused int tegra_vde_runtime_suspend(struct device *dev)
158 {
159 	struct tegra_vde *vde = dev_get_drvdata(dev);
160 	int err;
161 
162 	if (!dev->pm_domain) {
163 		err = tegra_powergate_power_off(TEGRA_POWERGATE_VDEC);
164 		if (err) {
165 			dev_err(dev, "Failed to power down HW: %d\n", err);
166 			return err;
167 		}
168 	}
169 
170 	clk_disable_unprepare(vde->clk);
171 	reset_control_release(vde->rst);
172 	reset_control_release(vde->rst_mc);
173 
174 	return 0;
175 }
176 
177 static __maybe_unused int tegra_vde_runtime_resume(struct device *dev)
178 {
179 	struct tegra_vde *vde = dev_get_drvdata(dev);
180 	int err;
181 
182 	err = reset_control_acquire(vde->rst_mc);
183 	if (err) {
184 		dev_err(dev, "Failed to acquire mc reset: %d\n", err);
185 		return err;
186 	}
187 
188 	err = reset_control_acquire(vde->rst);
189 	if (err) {
190 		dev_err(dev, "Failed to acquire reset: %d\n", err);
191 		goto release_mc_reset;
192 	}
193 
194 	if (!dev->pm_domain) {
195 		err = tegra_powergate_sequence_power_up(TEGRA_POWERGATE_VDEC,
196 							vde->clk, vde->rst);
197 		if (err) {
198 			dev_err(dev, "Failed to power up HW : %d\n", err);
199 			goto release_reset;
200 		}
201 	} else {
202 		/*
203 		 * tegra_powergate_sequence_power_up() leaves clocks enabled,
204 		 * while GENPD not.
205 		 */
206 		err = clk_prepare_enable(vde->clk);
207 		if (err) {
208 			dev_err(dev, "Failed to enable clock: %d\n", err);
209 			goto release_reset;
210 		}
211 	}
212 
213 	return 0;
214 
215 release_reset:
216 	reset_control_release(vde->rst);
217 release_mc_reset:
218 	reset_control_release(vde->rst_mc);
219 
220 	return err;
221 }
222 
223 static int tegra_vde_probe(struct platform_device *pdev)
224 {
225 	struct device *dev = &pdev->dev;
226 	struct tegra_vde *vde;
227 	int irq, err;
228 
229 	vde = devm_kzalloc(dev, sizeof(*vde), GFP_KERNEL);
230 	if (!vde)
231 		return -ENOMEM;
232 
233 	platform_set_drvdata(pdev, vde);
234 
235 	vde->soc = of_device_get_match_data(&pdev->dev);
236 	vde->dev = dev;
237 
238 	vde->sxe = devm_platform_ioremap_resource_byname(pdev, "sxe");
239 	if (IS_ERR(vde->sxe))
240 		return PTR_ERR(vde->sxe);
241 
242 	vde->bsev = devm_platform_ioremap_resource_byname(pdev, "bsev");
243 	if (IS_ERR(vde->bsev))
244 		return PTR_ERR(vde->bsev);
245 
246 	vde->mbe = devm_platform_ioremap_resource_byname(pdev, "mbe");
247 	if (IS_ERR(vde->mbe))
248 		return PTR_ERR(vde->mbe);
249 
250 	vde->ppe = devm_platform_ioremap_resource_byname(pdev, "ppe");
251 	if (IS_ERR(vde->ppe))
252 		return PTR_ERR(vde->ppe);
253 
254 	vde->mce = devm_platform_ioremap_resource_byname(pdev, "mce");
255 	if (IS_ERR(vde->mce))
256 		return PTR_ERR(vde->mce);
257 
258 	vde->tfe = devm_platform_ioremap_resource_byname(pdev, "tfe");
259 	if (IS_ERR(vde->tfe))
260 		return PTR_ERR(vde->tfe);
261 
262 	vde->ppb = devm_platform_ioremap_resource_byname(pdev, "ppb");
263 	if (IS_ERR(vde->ppb))
264 		return PTR_ERR(vde->ppb);
265 
266 	vde->vdma = devm_platform_ioremap_resource_byname(pdev, "vdma");
267 	if (IS_ERR(vde->vdma))
268 		return PTR_ERR(vde->vdma);
269 
270 	vde->frameid = devm_platform_ioremap_resource_byname(pdev, "frameid");
271 	if (IS_ERR(vde->frameid))
272 		return PTR_ERR(vde->frameid);
273 
274 	vde->clk = devm_clk_get(dev, NULL);
275 	if (IS_ERR(vde->clk)) {
276 		err = PTR_ERR(vde->clk);
277 		dev_err(dev, "Could not get VDE clk %d\n", err);
278 		return err;
279 	}
280 
281 	vde->rst = devm_reset_control_get_exclusive_released(dev, NULL);
282 	if (IS_ERR(vde->rst)) {
283 		err = PTR_ERR(vde->rst);
284 		dev_err(dev, "Could not get VDE reset %d\n", err);
285 		return err;
286 	}
287 
288 	vde->rst_mc = devm_reset_control_get_optional_exclusive_released(dev, "mc");
289 	if (IS_ERR(vde->rst_mc)) {
290 		err = PTR_ERR(vde->rst_mc);
291 		dev_err(dev, "Could not get MC reset %d\n", err);
292 		return err;
293 	}
294 
295 	irq = platform_get_irq_byname(pdev, "sync-token");
296 	if (irq < 0)
297 		return irq;
298 
299 	err = devm_request_irq(dev, irq, tegra_vde_isr, 0,
300 			       dev_name(dev), vde);
301 	if (err) {
302 		dev_err(dev, "Could not request IRQ %d\n", err);
303 		return err;
304 	}
305 
306 	err = devm_tegra_core_dev_init_opp_table_common(dev);
307 	if (err) {
308 		dev_err(dev, "Could initialize OPP table %d\n", err);
309 		return err;
310 	}
311 
312 	vde->iram_pool = of_gen_pool_get(dev->of_node, "iram", 0);
313 	if (!vde->iram_pool) {
314 		dev_err(dev, "Could not get IRAM pool\n");
315 		return -EPROBE_DEFER;
316 	}
317 
318 	vde->iram = gen_pool_dma_alloc(vde->iram_pool,
319 				       gen_pool_size(vde->iram_pool),
320 				       &vde->iram_lists_addr);
321 	if (!vde->iram) {
322 		dev_err(dev, "Could not reserve IRAM\n");
323 		return -ENOMEM;
324 	}
325 
326 	INIT_LIST_HEAD(&vde->map_list);
327 	mutex_init(&vde->map_lock);
328 	mutex_init(&vde->lock);
329 	init_completion(&vde->decode_completion);
330 
331 	err = tegra_vde_iommu_init(vde);
332 	if (err) {
333 		dev_err(dev, "Failed to initialize IOMMU: %d\n", err);
334 		goto err_gen_free;
335 	}
336 
337 	pm_runtime_enable(dev);
338 	pm_runtime_use_autosuspend(dev);
339 	pm_runtime_set_autosuspend_delay(dev, 300);
340 
341 	/*
342 	 * VDE partition may be left ON after bootloader, hence let's
343 	 * power-cycle it in order to put hardware into a predictable lower
344 	 * power state.
345 	 */
346 	err = pm_runtime_resume_and_get(dev);
347 	if (err)
348 		goto err_pm_runtime;
349 
350 	pm_runtime_put(dev);
351 
352 	err = tegra_vde_alloc_bo(vde, &vde->secure_bo, DMA_FROM_DEVICE, 4096);
353 	if (err) {
354 		dev_err(dev, "Failed to allocate secure BO: %d\n", err);
355 		goto err_pm_runtime;
356 	}
357 
358 	err = tegra_vde_v4l2_init(vde);
359 	if (err) {
360 		dev_err(dev, "Failed to initialize V4L2: %d\n", err);
361 		goto err_free_secure_bo;
362 	}
363 
364 	return 0;
365 
366 err_free_secure_bo:
367 	tegra_vde_free_bo(vde->secure_bo);
368 err_pm_runtime:
369 	pm_runtime_dont_use_autosuspend(dev);
370 	pm_runtime_disable(dev);
371 
372 	tegra_vde_iommu_deinit(vde);
373 
374 err_gen_free:
375 	gen_pool_free(vde->iram_pool, (unsigned long)vde->iram,
376 		      gen_pool_size(vde->iram_pool));
377 
378 	return err;
379 }
380 
381 static int tegra_vde_remove(struct platform_device *pdev)
382 {
383 	struct tegra_vde *vde = platform_get_drvdata(pdev);
384 	struct device *dev = &pdev->dev;
385 
386 	tegra_vde_v4l2_deinit(vde);
387 	tegra_vde_free_bo(vde->secure_bo);
388 
389 	/*
390 	 * As it increments RPM usage_count even on errors, we don't need to
391 	 * check the returned code here.
392 	 */
393 	pm_runtime_get_sync(dev);
394 
395 	pm_runtime_dont_use_autosuspend(dev);
396 	pm_runtime_disable(dev);
397 
398 	/*
399 	 * Balance RPM state, the VDE power domain is left ON and hardware
400 	 * is clock-gated. It's safe to reboot machine now.
401 	 */
402 	pm_runtime_put_noidle(dev);
403 	clk_disable_unprepare(vde->clk);
404 
405 	tegra_vde_dmabuf_cache_unmap_all(vde);
406 	tegra_vde_iommu_deinit(vde);
407 
408 	gen_pool_free(vde->iram_pool, (unsigned long)vde->iram,
409 		      gen_pool_size(vde->iram_pool));
410 
411 	return 0;
412 }
413 
414 static void tegra_vde_shutdown(struct platform_device *pdev)
415 {
416 	/*
417 	 * On some devices bootloader isn't ready to a power-gated VDE on
418 	 * a warm-reboot, machine will hang in that case.
419 	 */
420 	pm_runtime_get_sync(&pdev->dev);
421 }
422 
423 static __maybe_unused int tegra_vde_pm_suspend(struct device *dev)
424 {
425 	struct tegra_vde *vde = dev_get_drvdata(dev);
426 	int err;
427 
428 	mutex_lock(&vde->lock);
429 
430 	err = pm_runtime_force_suspend(dev);
431 	if (err < 0)
432 		return err;
433 
434 	return 0;
435 }
436 
437 static __maybe_unused int tegra_vde_pm_resume(struct device *dev)
438 {
439 	struct tegra_vde *vde = dev_get_drvdata(dev);
440 	int err;
441 
442 	err = pm_runtime_force_resume(dev);
443 	if (err < 0)
444 		return err;
445 
446 	mutex_unlock(&vde->lock);
447 
448 	return 0;
449 }
450 
451 static const struct dev_pm_ops tegra_vde_pm_ops = {
452 	SET_RUNTIME_PM_OPS(tegra_vde_runtime_suspend,
453 			   tegra_vde_runtime_resume,
454 			   NULL)
455 	SET_SYSTEM_SLEEP_PM_OPS(tegra_vde_pm_suspend,
456 				tegra_vde_pm_resume)
457 };
458 
459 static const u32 tegra124_decoded_fmts[] = {
460 	/* TBD: T124 supports only a non-standard Tegra tiled format */
461 };
462 
463 static const struct tegra_coded_fmt_desc tegra124_coded_fmts[] = {
464 	{
465 		.fourcc = V4L2_PIX_FMT_H264_SLICE,
466 		.frmsize = {
467 			.min_width = 16,
468 			.max_width = 1920,
469 			.step_width = 16,
470 			.min_height = 16,
471 			.max_height = 2032,
472 			.step_height = 16,
473 		},
474 		.num_decoded_fmts = ARRAY_SIZE(tegra124_decoded_fmts),
475 		.decoded_fmts = tegra124_decoded_fmts,
476 		.decode_run = tegra_vde_h264_decode_run,
477 		.decode_wait = tegra_vde_h264_decode_wait,
478 	},
479 };
480 
481 static const u32 tegra20_decoded_fmts[] = {
482 	V4L2_PIX_FMT_YUV420M,
483 	V4L2_PIX_FMT_YVU420M,
484 };
485 
486 static const struct tegra_coded_fmt_desc tegra20_coded_fmts[] = {
487 	{
488 		.fourcc = V4L2_PIX_FMT_H264_SLICE,
489 		.frmsize = {
490 			.min_width = 16,
491 			.max_width = 1920,
492 			.step_width = 16,
493 			.min_height = 16,
494 			.max_height = 2032,
495 			.step_height = 16,
496 		},
497 		.num_decoded_fmts = ARRAY_SIZE(tegra20_decoded_fmts),
498 		.decoded_fmts = tegra20_decoded_fmts,
499 		.decode_run = tegra_vde_h264_decode_run,
500 		.decode_wait = tegra_vde_h264_decode_wait,
501 	},
502 };
503 
504 static const struct tegra_vde_soc tegra124_vde_soc = {
505 	.supports_ref_pic_marking = true,
506 	.coded_fmts = tegra124_coded_fmts,
507 	.num_coded_fmts = ARRAY_SIZE(tegra124_coded_fmts),
508 };
509 
510 static const struct tegra_vde_soc tegra114_vde_soc = {
511 	.supports_ref_pic_marking = true,
512 	.coded_fmts = tegra20_coded_fmts,
513 	.num_coded_fmts = ARRAY_SIZE(tegra20_coded_fmts),
514 };
515 
516 static const struct tegra_vde_soc tegra30_vde_soc = {
517 	.supports_ref_pic_marking = false,
518 	.coded_fmts = tegra20_coded_fmts,
519 	.num_coded_fmts = ARRAY_SIZE(tegra20_coded_fmts),
520 };
521 
522 static const struct tegra_vde_soc tegra20_vde_soc = {
523 	.supports_ref_pic_marking = false,
524 	.coded_fmts = tegra20_coded_fmts,
525 	.num_coded_fmts = ARRAY_SIZE(tegra20_coded_fmts),
526 };
527 
528 static const struct of_device_id tegra_vde_of_match[] = {
529 	{ .compatible = "nvidia,tegra124-vde", .data = &tegra124_vde_soc },
530 	{ .compatible = "nvidia,tegra114-vde", .data = &tegra114_vde_soc },
531 	{ .compatible = "nvidia,tegra30-vde", .data = &tegra30_vde_soc },
532 	{ .compatible = "nvidia,tegra20-vde", .data = &tegra20_vde_soc },
533 	{ },
534 };
535 MODULE_DEVICE_TABLE(of, tegra_vde_of_match);
536 
537 static struct platform_driver tegra_vde_driver = {
538 	.probe		= tegra_vde_probe,
539 	.remove		= tegra_vde_remove,
540 	.shutdown	= tegra_vde_shutdown,
541 	.driver		= {
542 		.name		= "tegra-vde",
543 		.of_match_table = tegra_vde_of_match,
544 		.pm		= &tegra_vde_pm_ops,
545 	},
546 };
547 module_platform_driver(tegra_vde_driver);
548 
549 MODULE_DESCRIPTION("NVIDIA Tegra Video Decoder driver");
550 MODULE_AUTHOR("Dmitry Osipenko <digetx@gmail.com>");
551 MODULE_LICENSE("GPL");
552