1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (c) 2013-2022, NVIDIA CORPORATION.  All rights reserved.
4  */
5 
6 #include <linux/clk.h>
7 #include <linux/device.h>
8 #include <linux/kobject.h>
9 #include <linux/init.h>
10 #include <linux/io.h>
11 #include <linux/nvmem-consumer.h>
12 #include <linux/nvmem-provider.h>
13 #include <linux/of.h>
14 #include <linux/of_address.h>
15 #include <linux/platform_device.h>
16 #include <linux/pm_runtime.h>
17 #include <linux/reset.h>
18 #include <linux/slab.h>
19 #include <linux/sys_soc.h>
20 
21 #include <soc/tegra/common.h>
22 #include <soc/tegra/fuse.h>
23 
24 #include "fuse.h"
25 
26 struct tegra_sku_info tegra_sku_info;
27 EXPORT_SYMBOL(tegra_sku_info);
28 
29 static const char *tegra_revision_name[TEGRA_REVISION_MAX] = {
30 	[TEGRA_REVISION_UNKNOWN] = "unknown",
31 	[TEGRA_REVISION_A01]     = "A01",
32 	[TEGRA_REVISION_A02]     = "A02",
33 	[TEGRA_REVISION_A03]     = "A03",
34 	[TEGRA_REVISION_A03p]    = "A03 prime",
35 	[TEGRA_REVISION_A04]     = "A04",
36 };
37 
38 static const struct of_device_id car_match[] __initconst = {
39 	{ .compatible = "nvidia,tegra20-car", },
40 	{ .compatible = "nvidia,tegra30-car", },
41 	{ .compatible = "nvidia,tegra114-car", },
42 	{ .compatible = "nvidia,tegra124-car", },
43 	{ .compatible = "nvidia,tegra132-car", },
44 	{ .compatible = "nvidia,tegra210-car", },
45 	{},
46 };
47 
48 static struct tegra_fuse *fuse = &(struct tegra_fuse) {
49 	.base = NULL,
50 	.soc = NULL,
51 };
52 
53 static const struct of_device_id tegra_fuse_match[] = {
54 #ifdef CONFIG_ARCH_TEGRA_234_SOC
55 	{ .compatible = "nvidia,tegra234-efuse", .data = &tegra234_fuse_soc },
56 #endif
57 #ifdef CONFIG_ARCH_TEGRA_194_SOC
58 	{ .compatible = "nvidia,tegra194-efuse", .data = &tegra194_fuse_soc },
59 #endif
60 #ifdef CONFIG_ARCH_TEGRA_186_SOC
61 	{ .compatible = "nvidia,tegra186-efuse", .data = &tegra186_fuse_soc },
62 #endif
63 #ifdef CONFIG_ARCH_TEGRA_210_SOC
64 	{ .compatible = "nvidia,tegra210-efuse", .data = &tegra210_fuse_soc },
65 #endif
66 #ifdef CONFIG_ARCH_TEGRA_132_SOC
67 	{ .compatible = "nvidia,tegra132-efuse", .data = &tegra124_fuse_soc },
68 #endif
69 #ifdef CONFIG_ARCH_TEGRA_124_SOC
70 	{ .compatible = "nvidia,tegra124-efuse", .data = &tegra124_fuse_soc },
71 #endif
72 #ifdef CONFIG_ARCH_TEGRA_114_SOC
73 	{ .compatible = "nvidia,tegra114-efuse", .data = &tegra114_fuse_soc },
74 #endif
75 #ifdef CONFIG_ARCH_TEGRA_3x_SOC
76 	{ .compatible = "nvidia,tegra30-efuse", .data = &tegra30_fuse_soc },
77 #endif
78 #ifdef CONFIG_ARCH_TEGRA_2x_SOC
79 	{ .compatible = "nvidia,tegra20-efuse", .data = &tegra20_fuse_soc },
80 #endif
81 	{ /* sentinel */ }
82 };
83 
tegra_fuse_read(void * priv,unsigned int offset,void * value,size_t bytes)84 static int tegra_fuse_read(void *priv, unsigned int offset, void *value,
85 			   size_t bytes)
86 {
87 	unsigned int count = bytes / 4, i;
88 	struct tegra_fuse *fuse = priv;
89 	u32 *buffer = value;
90 
91 	for (i = 0; i < count; i++)
92 		buffer[i] = fuse->read(fuse, offset + i * 4);
93 
94 	return 0;
95 }
96 
97 static const struct nvmem_cell_info tegra_fuse_cells[] = {
98 	{
99 		.name = "tsensor-cpu1",
100 		.offset = 0x084,
101 		.bytes = 4,
102 		.bit_offset = 0,
103 		.nbits = 32,
104 	}, {
105 		.name = "tsensor-cpu2",
106 		.offset = 0x088,
107 		.bytes = 4,
108 		.bit_offset = 0,
109 		.nbits = 32,
110 	}, {
111 		.name = "tsensor-cpu0",
112 		.offset = 0x098,
113 		.bytes = 4,
114 		.bit_offset = 0,
115 		.nbits = 32,
116 	}, {
117 		.name = "xusb-pad-calibration",
118 		.offset = 0x0f0,
119 		.bytes = 4,
120 		.bit_offset = 0,
121 		.nbits = 32,
122 	}, {
123 		.name = "tsensor-cpu3",
124 		.offset = 0x12c,
125 		.bytes = 4,
126 		.bit_offset = 0,
127 		.nbits = 32,
128 	}, {
129 		.name = "sata-calibration",
130 		.offset = 0x124,
131 		.bytes = 1,
132 		.bit_offset = 0,
133 		.nbits = 2,
134 	}, {
135 		.name = "tsensor-gpu",
136 		.offset = 0x154,
137 		.bytes = 4,
138 		.bit_offset = 0,
139 		.nbits = 32,
140 	}, {
141 		.name = "tsensor-mem0",
142 		.offset = 0x158,
143 		.bytes = 4,
144 		.bit_offset = 0,
145 		.nbits = 32,
146 	}, {
147 		.name = "tsensor-mem1",
148 		.offset = 0x15c,
149 		.bytes = 4,
150 		.bit_offset = 0,
151 		.nbits = 32,
152 	}, {
153 		.name = "tsensor-pllx",
154 		.offset = 0x160,
155 		.bytes = 4,
156 		.bit_offset = 0,
157 		.nbits = 32,
158 	}, {
159 		.name = "tsensor-common",
160 		.offset = 0x180,
161 		.bytes = 4,
162 		.bit_offset = 0,
163 		.nbits = 32,
164 	}, {
165 		.name = "gpu-gcplex-config-fuse",
166 		.offset = 0x1c8,
167 		.bytes = 4,
168 		.bit_offset = 0,
169 		.nbits = 32,
170 	}, {
171 		.name = "tsensor-realignment",
172 		.offset = 0x1fc,
173 		.bytes = 4,
174 		.bit_offset = 0,
175 		.nbits = 32,
176 	}, {
177 		.name = "gpu-calibration",
178 		.offset = 0x204,
179 		.bytes = 4,
180 		.bit_offset = 0,
181 		.nbits = 32,
182 	}, {
183 		.name = "xusb-pad-calibration-ext",
184 		.offset = 0x250,
185 		.bytes = 4,
186 		.bit_offset = 0,
187 		.nbits = 32,
188 	}, {
189 		.name = "gpu-pdi0",
190 		.offset = 0x300,
191 		.bytes = 4,
192 		.bit_offset = 0,
193 		.nbits = 32,
194 	}, {
195 		.name = "gpu-pdi1",
196 		.offset = 0x304,
197 		.bytes = 4,
198 		.bit_offset = 0,
199 		.nbits = 32,
200 	},
201 };
202 
tegra_fuse_restore(void * base)203 static void tegra_fuse_restore(void *base)
204 {
205 	fuse->base = (void __iomem *)base;
206 	fuse->clk = NULL;
207 }
208 
tegra_fuse_probe(struct platform_device * pdev)209 static int tegra_fuse_probe(struct platform_device *pdev)
210 {
211 	void __iomem *base = fuse->base;
212 	struct nvmem_config nvmem;
213 	struct resource *res;
214 	int err;
215 
216 	err = devm_add_action(&pdev->dev, tegra_fuse_restore, (void __force *)base);
217 	if (err)
218 		return err;
219 
220 	/* take over the memory region from the early initialization */
221 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
222 	fuse->phys = res->start;
223 	fuse->base = devm_ioremap_resource(&pdev->dev, res);
224 	if (IS_ERR(fuse->base)) {
225 		err = PTR_ERR(fuse->base);
226 		return err;
227 	}
228 
229 	fuse->clk = devm_clk_get(&pdev->dev, "fuse");
230 	if (IS_ERR(fuse->clk)) {
231 		if (PTR_ERR(fuse->clk) != -EPROBE_DEFER)
232 			dev_err(&pdev->dev, "failed to get FUSE clock: %ld",
233 				PTR_ERR(fuse->clk));
234 
235 		return PTR_ERR(fuse->clk);
236 	}
237 
238 	platform_set_drvdata(pdev, fuse);
239 	fuse->dev = &pdev->dev;
240 
241 	err = devm_pm_runtime_enable(&pdev->dev);
242 	if (err)
243 		return err;
244 
245 	if (fuse->soc->probe) {
246 		err = fuse->soc->probe(fuse);
247 		if (err < 0)
248 			return err;
249 	}
250 
251 	memset(&nvmem, 0, sizeof(nvmem));
252 	nvmem.dev = &pdev->dev;
253 	nvmem.name = "fuse";
254 	nvmem.id = -1;
255 	nvmem.owner = THIS_MODULE;
256 	nvmem.cells = tegra_fuse_cells;
257 	nvmem.ncells = ARRAY_SIZE(tegra_fuse_cells);
258 	nvmem.type = NVMEM_TYPE_OTP;
259 	nvmem.read_only = true;
260 	nvmem.root_only = true;
261 	nvmem.reg_read = tegra_fuse_read;
262 	nvmem.size = fuse->soc->info->size;
263 	nvmem.word_size = 4;
264 	nvmem.stride = 4;
265 	nvmem.priv = fuse;
266 
267 	fuse->nvmem = devm_nvmem_register(&pdev->dev, &nvmem);
268 	if (IS_ERR(fuse->nvmem)) {
269 		err = PTR_ERR(fuse->nvmem);
270 		dev_err(&pdev->dev, "failed to register NVMEM device: %d\n",
271 			err);
272 		return err;
273 	}
274 
275 	fuse->rst = devm_reset_control_get_optional(&pdev->dev, "fuse");
276 	if (IS_ERR(fuse->rst)) {
277 		err = PTR_ERR(fuse->rst);
278 		dev_err(&pdev->dev, "failed to get FUSE reset: %pe\n",
279 			fuse->rst);
280 		return err;
281 	}
282 
283 	/*
284 	 * FUSE clock is enabled at a boot time, hence this resume/suspend
285 	 * disables the clock besides the h/w resetting.
286 	 */
287 	err = pm_runtime_resume_and_get(&pdev->dev);
288 	if (err)
289 		return err;
290 
291 	err = reset_control_reset(fuse->rst);
292 	pm_runtime_put(&pdev->dev);
293 
294 	if (err < 0) {
295 		dev_err(&pdev->dev, "failed to reset FUSE: %d\n", err);
296 		return err;
297 	}
298 
299 	/* release the early I/O memory mapping */
300 	iounmap(base);
301 
302 	return 0;
303 }
304 
tegra_fuse_runtime_resume(struct device * dev)305 static int __maybe_unused tegra_fuse_runtime_resume(struct device *dev)
306 {
307 	int err;
308 
309 	err = clk_prepare_enable(fuse->clk);
310 	if (err < 0) {
311 		dev_err(dev, "failed to enable FUSE clock: %d\n", err);
312 		return err;
313 	}
314 
315 	return 0;
316 }
317 
tegra_fuse_runtime_suspend(struct device * dev)318 static int __maybe_unused tegra_fuse_runtime_suspend(struct device *dev)
319 {
320 	clk_disable_unprepare(fuse->clk);
321 
322 	return 0;
323 }
324 
tegra_fuse_suspend(struct device * dev)325 static int __maybe_unused tegra_fuse_suspend(struct device *dev)
326 {
327 	int ret;
328 
329 	/*
330 	 * Critical for RAM re-repair operation, which must occur on resume
331 	 * from LP1 system suspend and as part of CCPLEX cluster switching.
332 	 */
333 	if (fuse->soc->clk_suspend_on)
334 		ret = pm_runtime_resume_and_get(dev);
335 	else
336 		ret = pm_runtime_force_suspend(dev);
337 
338 	return ret;
339 }
340 
tegra_fuse_resume(struct device * dev)341 static int __maybe_unused tegra_fuse_resume(struct device *dev)
342 {
343 	int ret = 0;
344 
345 	if (fuse->soc->clk_suspend_on)
346 		pm_runtime_put(dev);
347 	else
348 		ret = pm_runtime_force_resume(dev);
349 
350 	return ret;
351 }
352 
353 static const struct dev_pm_ops tegra_fuse_pm = {
354 	SET_RUNTIME_PM_OPS(tegra_fuse_runtime_suspend, tegra_fuse_runtime_resume,
355 			   NULL)
356 	SET_SYSTEM_SLEEP_PM_OPS(tegra_fuse_suspend, tegra_fuse_resume)
357 };
358 
359 static struct platform_driver tegra_fuse_driver = {
360 	.driver = {
361 		.name = "tegra-fuse",
362 		.of_match_table = tegra_fuse_match,
363 		.pm = &tegra_fuse_pm,
364 		.suppress_bind_attrs = true,
365 	},
366 	.probe = tegra_fuse_probe,
367 };
368 builtin_platform_driver(tegra_fuse_driver);
369 
tegra_fuse_read_spare(unsigned int spare)370 u32 __init tegra_fuse_read_spare(unsigned int spare)
371 {
372 	unsigned int offset = fuse->soc->info->spare + spare * 4;
373 
374 	return fuse->read_early(fuse, offset) & 1;
375 }
376 
tegra_fuse_read_early(unsigned int offset)377 u32 __init tegra_fuse_read_early(unsigned int offset)
378 {
379 	return fuse->read_early(fuse, offset);
380 }
381 
tegra_fuse_readl(unsigned long offset,u32 * value)382 int tegra_fuse_readl(unsigned long offset, u32 *value)
383 {
384 	if (!fuse->read || !fuse->clk)
385 		return -EPROBE_DEFER;
386 
387 	if (IS_ERR(fuse->clk))
388 		return PTR_ERR(fuse->clk);
389 
390 	*value = fuse->read(fuse, offset);
391 
392 	return 0;
393 }
394 EXPORT_SYMBOL(tegra_fuse_readl);
395 
tegra_enable_fuse_clk(void __iomem * base)396 static void tegra_enable_fuse_clk(void __iomem *base)
397 {
398 	u32 reg;
399 
400 	reg = readl_relaxed(base + 0x48);
401 	reg |= 1 << 28;
402 	writel(reg, base + 0x48);
403 
404 	/*
405 	 * Enable FUSE clock. This needs to be hardcoded because the clock
406 	 * subsystem is not active during early boot.
407 	 */
408 	reg = readl(base + 0x14);
409 	reg |= 1 << 7;
410 	writel(reg, base + 0x14);
411 }
412 
major_show(struct device * dev,struct device_attribute * attr,char * buf)413 static ssize_t major_show(struct device *dev, struct device_attribute *attr,
414 			     char *buf)
415 {
416 	return sprintf(buf, "%d\n", tegra_get_major_rev());
417 }
418 
419 static DEVICE_ATTR_RO(major);
420 
minor_show(struct device * dev,struct device_attribute * attr,char * buf)421 static ssize_t minor_show(struct device *dev, struct device_attribute *attr,
422 			     char *buf)
423 {
424 	return sprintf(buf, "%d\n", tegra_get_minor_rev());
425 }
426 
427 static DEVICE_ATTR_RO(minor);
428 
429 static struct attribute *tegra_soc_attr[] = {
430 	&dev_attr_major.attr,
431 	&dev_attr_minor.attr,
432 	NULL,
433 };
434 
435 const struct attribute_group tegra_soc_attr_group = {
436 	.attrs = tegra_soc_attr,
437 };
438 
439 #if IS_ENABLED(CONFIG_ARCH_TEGRA_194_SOC) || \
440     IS_ENABLED(CONFIG_ARCH_TEGRA_234_SOC)
platform_show(struct device * dev,struct device_attribute * attr,char * buf)441 static ssize_t platform_show(struct device *dev, struct device_attribute *attr,
442 			     char *buf)
443 {
444 	/*
445 	 * Displays the value in the 'pre_si_platform' field of the HIDREV
446 	 * register for Tegra194 devices. A value of 0 indicates that the
447 	 * platform type is silicon and all other non-zero values indicate
448 	 * the type of simulation platform is being used.
449 	 */
450 	return sprintf(buf, "%d\n", tegra_get_platform());
451 }
452 
453 static DEVICE_ATTR_RO(platform);
454 
455 static struct attribute *tegra194_soc_attr[] = {
456 	&dev_attr_major.attr,
457 	&dev_attr_minor.attr,
458 	&dev_attr_platform.attr,
459 	NULL,
460 };
461 
462 const struct attribute_group tegra194_soc_attr_group = {
463 	.attrs = tegra194_soc_attr,
464 };
465 #endif
466 
tegra_soc_device_register(void)467 struct device * __init tegra_soc_device_register(void)
468 {
469 	struct soc_device_attribute *attr;
470 	struct soc_device *dev;
471 
472 	attr = kzalloc(sizeof(*attr), GFP_KERNEL);
473 	if (!attr)
474 		return NULL;
475 
476 	attr->family = kasprintf(GFP_KERNEL, "Tegra");
477 	attr->revision = kasprintf(GFP_KERNEL, "%s",
478 		tegra_revision_name[tegra_sku_info.revision]);
479 	attr->soc_id = kasprintf(GFP_KERNEL, "%u", tegra_get_chip_id());
480 	attr->custom_attr_group = fuse->soc->soc_attr_group;
481 
482 	dev = soc_device_register(attr);
483 	if (IS_ERR(dev)) {
484 		kfree(attr->soc_id);
485 		kfree(attr->revision);
486 		kfree(attr->family);
487 		kfree(attr);
488 		return ERR_CAST(dev);
489 	}
490 
491 	return soc_device_to_device(dev);
492 }
493 
tegra_init_fuse(void)494 static int __init tegra_init_fuse(void)
495 {
496 	const struct of_device_id *match;
497 	struct device_node *np;
498 	struct resource regs;
499 
500 	tegra_init_apbmisc();
501 
502 	np = of_find_matching_node_and_match(NULL, tegra_fuse_match, &match);
503 	if (!np) {
504 		/*
505 		 * Fall back to legacy initialization for 32-bit ARM only. All
506 		 * 64-bit ARM device tree files for Tegra are required to have
507 		 * a FUSE node.
508 		 *
509 		 * This is for backwards-compatibility with old device trees
510 		 * that didn't contain a FUSE node.
511 		 */
512 		if (IS_ENABLED(CONFIG_ARM) && soc_is_tegra()) {
513 			u8 chip = tegra_get_chip_id();
514 
515 			regs.start = 0x7000f800;
516 			regs.end = 0x7000fbff;
517 			regs.flags = IORESOURCE_MEM;
518 
519 			switch (chip) {
520 #ifdef CONFIG_ARCH_TEGRA_2x_SOC
521 			case TEGRA20:
522 				fuse->soc = &tegra20_fuse_soc;
523 				break;
524 #endif
525 
526 #ifdef CONFIG_ARCH_TEGRA_3x_SOC
527 			case TEGRA30:
528 				fuse->soc = &tegra30_fuse_soc;
529 				break;
530 #endif
531 
532 #ifdef CONFIG_ARCH_TEGRA_114_SOC
533 			case TEGRA114:
534 				fuse->soc = &tegra114_fuse_soc;
535 				break;
536 #endif
537 
538 #ifdef CONFIG_ARCH_TEGRA_124_SOC
539 			case TEGRA124:
540 				fuse->soc = &tegra124_fuse_soc;
541 				break;
542 #endif
543 
544 			default:
545 				pr_warn("Unsupported SoC: %02x\n", chip);
546 				break;
547 			}
548 		} else {
549 			/*
550 			 * At this point we're not running on Tegra, so play
551 			 * nice with multi-platform kernels.
552 			 */
553 			return 0;
554 		}
555 	} else {
556 		/*
557 		 * Extract information from the device tree if we've found a
558 		 * matching node.
559 		 */
560 		if (of_address_to_resource(np, 0, &regs) < 0) {
561 			pr_err("failed to get FUSE register\n");
562 			return -ENXIO;
563 		}
564 
565 		fuse->soc = match->data;
566 	}
567 
568 	np = of_find_matching_node(NULL, car_match);
569 	if (np) {
570 		void __iomem *base = of_iomap(np, 0);
571 		of_node_put(np);
572 		if (base) {
573 			tegra_enable_fuse_clk(base);
574 			iounmap(base);
575 		} else {
576 			pr_err("failed to map clock registers\n");
577 			return -ENXIO;
578 		}
579 	}
580 
581 	fuse->base = ioremap(regs.start, resource_size(&regs));
582 	if (!fuse->base) {
583 		pr_err("failed to map FUSE registers\n");
584 		return -ENXIO;
585 	}
586 
587 	fuse->soc->init(fuse);
588 
589 	pr_info("Tegra Revision: %s SKU: %d CPU Process: %d SoC Process: %d\n",
590 		tegra_revision_name[tegra_sku_info.revision],
591 		tegra_sku_info.sku_id, tegra_sku_info.cpu_process_id,
592 		tegra_sku_info.soc_process_id);
593 	pr_debug("Tegra CPU Speedo ID %d, SoC Speedo ID %d\n",
594 		 tegra_sku_info.cpu_speedo_id, tegra_sku_info.soc_speedo_id);
595 
596 	if (fuse->soc->lookups) {
597 		size_t size = sizeof(*fuse->lookups) * fuse->soc->num_lookups;
598 
599 		fuse->lookups = kmemdup(fuse->soc->lookups, size, GFP_KERNEL);
600 		if (fuse->lookups)
601 			nvmem_add_cell_lookups(fuse->lookups, fuse->soc->num_lookups);
602 	}
603 
604 	return 0;
605 }
606 early_initcall(tegra_init_fuse);
607 
608 #ifdef CONFIG_ARM64
tegra_init_soc(void)609 static int __init tegra_init_soc(void)
610 {
611 	struct device_node *np;
612 	struct device *soc;
613 
614 	/* make sure we're running on Tegra */
615 	np = of_find_matching_node(NULL, tegra_fuse_match);
616 	if (!np)
617 		return 0;
618 
619 	of_node_put(np);
620 
621 	soc = tegra_soc_device_register();
622 	if (IS_ERR(soc)) {
623 		pr_err("failed to register SoC device: %ld\n", PTR_ERR(soc));
624 		return PTR_ERR(soc);
625 	}
626 
627 	return 0;
628 }
629 device_initcall(tegra_init_soc);
630 #endif
631