1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2013-2014, 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/slab.h>
18 #include <linux/sys_soc.h>
19
20 #include <soc/tegra/common.h>
21 #include <soc/tegra/fuse.h>
22
23 #include "fuse.h"
24
25 struct tegra_sku_info tegra_sku_info;
26 EXPORT_SYMBOL(tegra_sku_info);
27
28 static const char *tegra_revision_name[TEGRA_REVISION_MAX] = {
29 [TEGRA_REVISION_UNKNOWN] = "unknown",
30 [TEGRA_REVISION_A01] = "A01",
31 [TEGRA_REVISION_A02] = "A02",
32 [TEGRA_REVISION_A03] = "A03",
33 [TEGRA_REVISION_A03p] = "A03 prime",
34 [TEGRA_REVISION_A04] = "A04",
35 };
36
37 static const struct of_device_id car_match[] __initconst = {
38 { .compatible = "nvidia,tegra20-car", },
39 { .compatible = "nvidia,tegra30-car", },
40 { .compatible = "nvidia,tegra114-car", },
41 { .compatible = "nvidia,tegra124-car", },
42 { .compatible = "nvidia,tegra132-car", },
43 { .compatible = "nvidia,tegra210-car", },
44 {},
45 };
46
47 static struct tegra_fuse *fuse = &(struct tegra_fuse) {
48 .base = NULL,
49 .soc = NULL,
50 };
51
52 static const struct of_device_id tegra_fuse_match[] = {
53 #ifdef CONFIG_ARCH_TEGRA_234_SOC
54 { .compatible = "nvidia,tegra234-efuse", .data = &tegra234_fuse_soc },
55 #endif
56 #ifdef CONFIG_ARCH_TEGRA_194_SOC
57 { .compatible = "nvidia,tegra194-efuse", .data = &tegra194_fuse_soc },
58 #endif
59 #ifdef CONFIG_ARCH_TEGRA_186_SOC
60 { .compatible = "nvidia,tegra186-efuse", .data = &tegra186_fuse_soc },
61 #endif
62 #ifdef CONFIG_ARCH_TEGRA_210_SOC
63 { .compatible = "nvidia,tegra210-efuse", .data = &tegra210_fuse_soc },
64 #endif
65 #ifdef CONFIG_ARCH_TEGRA_132_SOC
66 { .compatible = "nvidia,tegra132-efuse", .data = &tegra124_fuse_soc },
67 #endif
68 #ifdef CONFIG_ARCH_TEGRA_124_SOC
69 { .compatible = "nvidia,tegra124-efuse", .data = &tegra124_fuse_soc },
70 #endif
71 #ifdef CONFIG_ARCH_TEGRA_114_SOC
72 { .compatible = "nvidia,tegra114-efuse", .data = &tegra114_fuse_soc },
73 #endif
74 #ifdef CONFIG_ARCH_TEGRA_3x_SOC
75 { .compatible = "nvidia,tegra30-efuse", .data = &tegra30_fuse_soc },
76 #endif
77 #ifdef CONFIG_ARCH_TEGRA_2x_SOC
78 { .compatible = "nvidia,tegra20-efuse", .data = &tegra20_fuse_soc },
79 #endif
80 { /* sentinel */ }
81 };
82
tegra_fuse_read(void * priv,unsigned int offset,void * value,size_t bytes)83 static int tegra_fuse_read(void *priv, unsigned int offset, void *value,
84 size_t bytes)
85 {
86 unsigned int count = bytes / 4, i;
87 struct tegra_fuse *fuse = priv;
88 u32 *buffer = value;
89
90 for (i = 0; i < count; i++)
91 buffer[i] = fuse->read(fuse, offset + i * 4);
92
93 return 0;
94 }
95
96 static const struct nvmem_cell_info tegra_fuse_cells[] = {
97 {
98 .name = "tsensor-cpu1",
99 .offset = 0x084,
100 .bytes = 4,
101 .bit_offset = 0,
102 .nbits = 32,
103 }, {
104 .name = "tsensor-cpu2",
105 .offset = 0x088,
106 .bytes = 4,
107 .bit_offset = 0,
108 .nbits = 32,
109 }, {
110 .name = "tsensor-cpu0",
111 .offset = 0x098,
112 .bytes = 4,
113 .bit_offset = 0,
114 .nbits = 32,
115 }, {
116 .name = "xusb-pad-calibration",
117 .offset = 0x0f0,
118 .bytes = 4,
119 .bit_offset = 0,
120 .nbits = 32,
121 }, {
122 .name = "tsensor-cpu3",
123 .offset = 0x12c,
124 .bytes = 4,
125 .bit_offset = 0,
126 .nbits = 32,
127 }, {
128 .name = "sata-calibration",
129 .offset = 0x124,
130 .bytes = 1,
131 .bit_offset = 0,
132 .nbits = 2,
133 }, {
134 .name = "tsensor-gpu",
135 .offset = 0x154,
136 .bytes = 4,
137 .bit_offset = 0,
138 .nbits = 32,
139 }, {
140 .name = "tsensor-mem0",
141 .offset = 0x158,
142 .bytes = 4,
143 .bit_offset = 0,
144 .nbits = 32,
145 }, {
146 .name = "tsensor-mem1",
147 .offset = 0x15c,
148 .bytes = 4,
149 .bit_offset = 0,
150 .nbits = 32,
151 }, {
152 .name = "tsensor-pllx",
153 .offset = 0x160,
154 .bytes = 4,
155 .bit_offset = 0,
156 .nbits = 32,
157 }, {
158 .name = "tsensor-common",
159 .offset = 0x180,
160 .bytes = 4,
161 .bit_offset = 0,
162 .nbits = 32,
163 }, {
164 .name = "tsensor-realignment",
165 .offset = 0x1fc,
166 .bytes = 4,
167 .bit_offset = 0,
168 .nbits = 32,
169 }, {
170 .name = "gpu-calibration",
171 .offset = 0x204,
172 .bytes = 4,
173 .bit_offset = 0,
174 .nbits = 32,
175 }, {
176 .name = "xusb-pad-calibration-ext",
177 .offset = 0x250,
178 .bytes = 4,
179 .bit_offset = 0,
180 .nbits = 32,
181 },
182 };
183
tegra_fuse_probe(struct platform_device * pdev)184 static int tegra_fuse_probe(struct platform_device *pdev)
185 {
186 void __iomem *base = fuse->base;
187 struct nvmem_config nvmem;
188 struct resource *res;
189 int err;
190
191 /* take over the memory region from the early initialization */
192 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
193 fuse->phys = res->start;
194 fuse->base = devm_ioremap_resource(&pdev->dev, res);
195 if (IS_ERR(fuse->base)) {
196 err = PTR_ERR(fuse->base);
197 fuse->base = base;
198 return err;
199 }
200
201 fuse->clk = devm_clk_get(&pdev->dev, "fuse");
202 if (IS_ERR(fuse->clk)) {
203 if (PTR_ERR(fuse->clk) != -EPROBE_DEFER)
204 dev_err(&pdev->dev, "failed to get FUSE clock: %ld",
205 PTR_ERR(fuse->clk));
206
207 fuse->base = base;
208 return PTR_ERR(fuse->clk);
209 }
210
211 platform_set_drvdata(pdev, fuse);
212 fuse->dev = &pdev->dev;
213
214 pm_runtime_enable(&pdev->dev);
215
216 if (fuse->soc->probe) {
217 err = fuse->soc->probe(fuse);
218 if (err < 0)
219 goto restore;
220 }
221
222 memset(&nvmem, 0, sizeof(nvmem));
223 nvmem.dev = &pdev->dev;
224 nvmem.name = "fuse";
225 nvmem.id = -1;
226 nvmem.owner = THIS_MODULE;
227 nvmem.cells = tegra_fuse_cells;
228 nvmem.ncells = ARRAY_SIZE(tegra_fuse_cells);
229 nvmem.type = NVMEM_TYPE_OTP;
230 nvmem.read_only = true;
231 nvmem.root_only = true;
232 nvmem.reg_read = tegra_fuse_read;
233 nvmem.size = fuse->soc->info->size;
234 nvmem.word_size = 4;
235 nvmem.stride = 4;
236 nvmem.priv = fuse;
237
238 fuse->nvmem = devm_nvmem_register(&pdev->dev, &nvmem);
239 if (IS_ERR(fuse->nvmem)) {
240 err = PTR_ERR(fuse->nvmem);
241 dev_err(&pdev->dev, "failed to register NVMEM device: %d\n",
242 err);
243 goto restore;
244 }
245
246 /* release the early I/O memory mapping */
247 iounmap(base);
248
249 return 0;
250
251 restore:
252 fuse->clk = NULL;
253 fuse->base = base;
254 pm_runtime_disable(&pdev->dev);
255 return err;
256 }
257
tegra_fuse_runtime_resume(struct device * dev)258 static int __maybe_unused tegra_fuse_runtime_resume(struct device *dev)
259 {
260 int err;
261
262 err = clk_prepare_enable(fuse->clk);
263 if (err < 0) {
264 dev_err(dev, "failed to enable FUSE clock: %d\n", err);
265 return err;
266 }
267
268 return 0;
269 }
270
tegra_fuse_runtime_suspend(struct device * dev)271 static int __maybe_unused tegra_fuse_runtime_suspend(struct device *dev)
272 {
273 clk_disable_unprepare(fuse->clk);
274
275 return 0;
276 }
277
tegra_fuse_suspend(struct device * dev)278 static int __maybe_unused tegra_fuse_suspend(struct device *dev)
279 {
280 int ret;
281
282 /*
283 * Critical for RAM re-repair operation, which must occur on resume
284 * from LP1 system suspend and as part of CCPLEX cluster switching.
285 */
286 if (fuse->soc->clk_suspend_on)
287 ret = pm_runtime_resume_and_get(dev);
288 else
289 ret = pm_runtime_force_suspend(dev);
290
291 return ret;
292 }
293
tegra_fuse_resume(struct device * dev)294 static int __maybe_unused tegra_fuse_resume(struct device *dev)
295 {
296 int ret = 0;
297
298 if (fuse->soc->clk_suspend_on)
299 pm_runtime_put(dev);
300 else
301 ret = pm_runtime_force_resume(dev);
302
303 return ret;
304 }
305
306 static const struct dev_pm_ops tegra_fuse_pm = {
307 SET_RUNTIME_PM_OPS(tegra_fuse_runtime_suspend, tegra_fuse_runtime_resume,
308 NULL)
309 SET_SYSTEM_SLEEP_PM_OPS(tegra_fuse_suspend, tegra_fuse_resume)
310 };
311
312 static struct platform_driver tegra_fuse_driver = {
313 .driver = {
314 .name = "tegra-fuse",
315 .of_match_table = tegra_fuse_match,
316 .pm = &tegra_fuse_pm,
317 .suppress_bind_attrs = true,
318 },
319 .probe = tegra_fuse_probe,
320 };
321 builtin_platform_driver(tegra_fuse_driver);
322
tegra_fuse_read_spare(unsigned int spare)323 u32 __init tegra_fuse_read_spare(unsigned int spare)
324 {
325 unsigned int offset = fuse->soc->info->spare + spare * 4;
326
327 return fuse->read_early(fuse, offset) & 1;
328 }
329
tegra_fuse_read_early(unsigned int offset)330 u32 __init tegra_fuse_read_early(unsigned int offset)
331 {
332 return fuse->read_early(fuse, offset);
333 }
334
tegra_fuse_readl(unsigned long offset,u32 * value)335 int tegra_fuse_readl(unsigned long offset, u32 *value)
336 {
337 if (!fuse->read || !fuse->clk)
338 return -EPROBE_DEFER;
339
340 if (IS_ERR(fuse->clk))
341 return PTR_ERR(fuse->clk);
342
343 *value = fuse->read(fuse, offset);
344
345 return 0;
346 }
347 EXPORT_SYMBOL(tegra_fuse_readl);
348
tegra_enable_fuse_clk(void __iomem * base)349 static void tegra_enable_fuse_clk(void __iomem *base)
350 {
351 u32 reg;
352
353 reg = readl_relaxed(base + 0x48);
354 reg |= 1 << 28;
355 writel(reg, base + 0x48);
356
357 /*
358 * Enable FUSE clock. This needs to be hardcoded because the clock
359 * subsystem is not active during early boot.
360 */
361 reg = readl(base + 0x14);
362 reg |= 1 << 7;
363 writel(reg, base + 0x14);
364 }
365
major_show(struct device * dev,struct device_attribute * attr,char * buf)366 static ssize_t major_show(struct device *dev, struct device_attribute *attr,
367 char *buf)
368 {
369 return sprintf(buf, "%d\n", tegra_get_major_rev());
370 }
371
372 static DEVICE_ATTR_RO(major);
373
minor_show(struct device * dev,struct device_attribute * attr,char * buf)374 static ssize_t minor_show(struct device *dev, struct device_attribute *attr,
375 char *buf)
376 {
377 return sprintf(buf, "%d\n", tegra_get_minor_rev());
378 }
379
380 static DEVICE_ATTR_RO(minor);
381
382 static struct attribute *tegra_soc_attr[] = {
383 &dev_attr_major.attr,
384 &dev_attr_minor.attr,
385 NULL,
386 };
387
388 const struct attribute_group tegra_soc_attr_group = {
389 .attrs = tegra_soc_attr,
390 };
391
392 #if IS_ENABLED(CONFIG_ARCH_TEGRA_194_SOC) || \
393 IS_ENABLED(CONFIG_ARCH_TEGRA_234_SOC)
platform_show(struct device * dev,struct device_attribute * attr,char * buf)394 static ssize_t platform_show(struct device *dev, struct device_attribute *attr,
395 char *buf)
396 {
397 /*
398 * Displays the value in the 'pre_si_platform' field of the HIDREV
399 * register for Tegra194 devices. A value of 0 indicates that the
400 * platform type is silicon and all other non-zero values indicate
401 * the type of simulation platform is being used.
402 */
403 return sprintf(buf, "%d\n", tegra_get_platform());
404 }
405
406 static DEVICE_ATTR_RO(platform);
407
408 static struct attribute *tegra194_soc_attr[] = {
409 &dev_attr_major.attr,
410 &dev_attr_minor.attr,
411 &dev_attr_platform.attr,
412 NULL,
413 };
414
415 const struct attribute_group tegra194_soc_attr_group = {
416 .attrs = tegra194_soc_attr,
417 };
418 #endif
419
tegra_soc_device_register(void)420 struct device * __init tegra_soc_device_register(void)
421 {
422 struct soc_device_attribute *attr;
423 struct soc_device *dev;
424
425 attr = kzalloc(sizeof(*attr), GFP_KERNEL);
426 if (!attr)
427 return NULL;
428
429 attr->family = kasprintf(GFP_KERNEL, "Tegra");
430 attr->revision = kasprintf(GFP_KERNEL, "%s",
431 tegra_revision_name[tegra_sku_info.revision]);
432 attr->soc_id = kasprintf(GFP_KERNEL, "%u", tegra_get_chip_id());
433 attr->custom_attr_group = fuse->soc->soc_attr_group;
434
435 dev = soc_device_register(attr);
436 if (IS_ERR(dev)) {
437 kfree(attr->soc_id);
438 kfree(attr->revision);
439 kfree(attr->family);
440 kfree(attr);
441 return ERR_CAST(dev);
442 }
443
444 return soc_device_to_device(dev);
445 }
446
tegra_init_fuse(void)447 static int __init tegra_init_fuse(void)
448 {
449 const struct of_device_id *match;
450 struct device_node *np;
451 struct resource regs;
452
453 tegra_init_apbmisc();
454
455 np = of_find_matching_node_and_match(NULL, tegra_fuse_match, &match);
456 if (!np) {
457 /*
458 * Fall back to legacy initialization for 32-bit ARM only. All
459 * 64-bit ARM device tree files for Tegra are required to have
460 * a FUSE node.
461 *
462 * This is for backwards-compatibility with old device trees
463 * that didn't contain a FUSE node.
464 */
465 if (IS_ENABLED(CONFIG_ARM) && soc_is_tegra()) {
466 u8 chip = tegra_get_chip_id();
467
468 regs.start = 0x7000f800;
469 regs.end = 0x7000fbff;
470 regs.flags = IORESOURCE_MEM;
471
472 switch (chip) {
473 #ifdef CONFIG_ARCH_TEGRA_2x_SOC
474 case TEGRA20:
475 fuse->soc = &tegra20_fuse_soc;
476 break;
477 #endif
478
479 #ifdef CONFIG_ARCH_TEGRA_3x_SOC
480 case TEGRA30:
481 fuse->soc = &tegra30_fuse_soc;
482 break;
483 #endif
484
485 #ifdef CONFIG_ARCH_TEGRA_114_SOC
486 case TEGRA114:
487 fuse->soc = &tegra114_fuse_soc;
488 break;
489 #endif
490
491 #ifdef CONFIG_ARCH_TEGRA_124_SOC
492 case TEGRA124:
493 fuse->soc = &tegra124_fuse_soc;
494 break;
495 #endif
496
497 default:
498 pr_warn("Unsupported SoC: %02x\n", chip);
499 break;
500 }
501 } else {
502 /*
503 * At this point we're not running on Tegra, so play
504 * nice with multi-platform kernels.
505 */
506 return 0;
507 }
508 } else {
509 /*
510 * Extract information from the device tree if we've found a
511 * matching node.
512 */
513 if (of_address_to_resource(np, 0, ®s) < 0) {
514 pr_err("failed to get FUSE register\n");
515 return -ENXIO;
516 }
517
518 fuse->soc = match->data;
519 }
520
521 np = of_find_matching_node(NULL, car_match);
522 if (np) {
523 void __iomem *base = of_iomap(np, 0);
524 if (base) {
525 tegra_enable_fuse_clk(base);
526 iounmap(base);
527 } else {
528 pr_err("failed to map clock registers\n");
529 return -ENXIO;
530 }
531 }
532
533 fuse->base = ioremap(regs.start, resource_size(®s));
534 if (!fuse->base) {
535 pr_err("failed to map FUSE registers\n");
536 return -ENXIO;
537 }
538
539 fuse->soc->init(fuse);
540
541 pr_info("Tegra Revision: %s SKU: %d CPU Process: %d SoC Process: %d\n",
542 tegra_revision_name[tegra_sku_info.revision],
543 tegra_sku_info.sku_id, tegra_sku_info.cpu_process_id,
544 tegra_sku_info.soc_process_id);
545 pr_debug("Tegra CPU Speedo ID %d, SoC Speedo ID %d\n",
546 tegra_sku_info.cpu_speedo_id, tegra_sku_info.soc_speedo_id);
547
548 if (fuse->soc->lookups) {
549 size_t size = sizeof(*fuse->lookups) * fuse->soc->num_lookups;
550
551 fuse->lookups = kmemdup(fuse->soc->lookups, size, GFP_KERNEL);
552 if (fuse->lookups)
553 nvmem_add_cell_lookups(fuse->lookups, fuse->soc->num_lookups);
554 }
555
556 return 0;
557 }
558 early_initcall(tegra_init_fuse);
559
560 #ifdef CONFIG_ARM64
tegra_init_soc(void)561 static int __init tegra_init_soc(void)
562 {
563 struct device_node *np;
564 struct device *soc;
565
566 /* make sure we're running on Tegra */
567 np = of_find_matching_node(NULL, tegra_fuse_match);
568 if (!np)
569 return 0;
570
571 of_node_put(np);
572
573 soc = tegra_soc_device_register();
574 if (IS_ERR(soc)) {
575 pr_err("failed to register SoC device: %ld\n", PTR_ERR(soc));
576 return PTR_ERR(soc);
577 }
578
579 return 0;
580 }
581 device_initcall(tegra_init_soc);
582 #endif
583