1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Driver for the NVIDIA Tegra pinmux
4  *
5  * Copyright (c) 2011-2012, NVIDIA CORPORATION.  All rights reserved.
6  *
7  * Derived from code:
8  * Copyright (C) 2010 Google, Inc.
9  * Copyright (C) 2010 NVIDIA Corporation
10  * Copyright (C) 2009-2011 ST-Ericsson AB
11  */
12 
13 #include <linux/err.h>
14 #include <linux/init.h>
15 #include <linux/io.h>
16 #include <linux/of.h>
17 #include <linux/platform_device.h>
18 #include <linux/seq_file.h>
19 #include <linux/slab.h>
20 
21 #include <linux/pinctrl/machine.h>
22 #include <linux/pinctrl/pinconf.h>
23 #include <linux/pinctrl/pinctrl.h>
24 #include <linux/pinctrl/pinmux.h>
25 
26 #include "../core.h"
27 #include "../pinctrl-utils.h"
28 #include "pinctrl-tegra.h"
29 
pmx_readl(struct tegra_pmx * pmx,u32 bank,u32 reg)30 static inline u32 pmx_readl(struct tegra_pmx *pmx, u32 bank, u32 reg)
31 {
32 	return readl(pmx->regs[bank] + reg);
33 }
34 
pmx_writel(struct tegra_pmx * pmx,u32 val,u32 bank,u32 reg)35 static inline void pmx_writel(struct tegra_pmx *pmx, u32 val, u32 bank, u32 reg)
36 {
37 	writel_relaxed(val, pmx->regs[bank] + reg);
38 	/* make sure pinmux register write completed */
39 	pmx_readl(pmx, bank, reg);
40 }
41 
tegra_pinctrl_get_groups_count(struct pinctrl_dev * pctldev)42 static int tegra_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
43 {
44 	struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
45 
46 	return pmx->soc->ngroups;
47 }
48 
tegra_pinctrl_get_group_name(struct pinctrl_dev * pctldev,unsigned group)49 static const char *tegra_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
50 						unsigned group)
51 {
52 	struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
53 
54 	return pmx->soc->groups[group].name;
55 }
56 
tegra_pinctrl_get_group_pins(struct pinctrl_dev * pctldev,unsigned group,const unsigned ** pins,unsigned * num_pins)57 static int tegra_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
58 					unsigned group,
59 					const unsigned **pins,
60 					unsigned *num_pins)
61 {
62 	struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
63 
64 	*pins = pmx->soc->groups[group].pins;
65 	*num_pins = pmx->soc->groups[group].npins;
66 
67 	return 0;
68 }
69 
70 #ifdef CONFIG_DEBUG_FS
tegra_pinctrl_pin_dbg_show(struct pinctrl_dev * pctldev,struct seq_file * s,unsigned offset)71 static void tegra_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev,
72 				       struct seq_file *s,
73 				       unsigned offset)
74 {
75 	seq_printf(s, " %s", dev_name(pctldev->dev));
76 }
77 #endif
78 
79 static const struct cfg_param {
80 	const char *property;
81 	enum tegra_pinconf_param param;
82 } cfg_params[] = {
83 	{"nvidia,pull",			TEGRA_PINCONF_PARAM_PULL},
84 	{"nvidia,tristate",		TEGRA_PINCONF_PARAM_TRISTATE},
85 	{"nvidia,enable-input",		TEGRA_PINCONF_PARAM_ENABLE_INPUT},
86 	{"nvidia,open-drain",		TEGRA_PINCONF_PARAM_OPEN_DRAIN},
87 	{"nvidia,lock",			TEGRA_PINCONF_PARAM_LOCK},
88 	{"nvidia,io-reset",		TEGRA_PINCONF_PARAM_IORESET},
89 	{"nvidia,rcv-sel",		TEGRA_PINCONF_PARAM_RCV_SEL},
90 	{"nvidia,io-hv",		TEGRA_PINCONF_PARAM_RCV_SEL},
91 	{"nvidia,high-speed-mode",	TEGRA_PINCONF_PARAM_HIGH_SPEED_MODE},
92 	{"nvidia,schmitt",		TEGRA_PINCONF_PARAM_SCHMITT},
93 	{"nvidia,low-power-mode",	TEGRA_PINCONF_PARAM_LOW_POWER_MODE},
94 	{"nvidia,pull-down-strength",	TEGRA_PINCONF_PARAM_DRIVE_DOWN_STRENGTH},
95 	{"nvidia,pull-up-strength",	TEGRA_PINCONF_PARAM_DRIVE_UP_STRENGTH},
96 	{"nvidia,slew-rate-falling",	TEGRA_PINCONF_PARAM_SLEW_RATE_FALLING},
97 	{"nvidia,slew-rate-rising",	TEGRA_PINCONF_PARAM_SLEW_RATE_RISING},
98 	{"nvidia,drive-type",		TEGRA_PINCONF_PARAM_DRIVE_TYPE},
99 };
100 
tegra_pinctrl_dt_subnode_to_map(struct pinctrl_dev * pctldev,struct device_node * np,struct pinctrl_map ** map,unsigned * reserved_maps,unsigned * num_maps)101 static int tegra_pinctrl_dt_subnode_to_map(struct pinctrl_dev *pctldev,
102 					   struct device_node *np,
103 					   struct pinctrl_map **map,
104 					   unsigned *reserved_maps,
105 					   unsigned *num_maps)
106 {
107 	struct device *dev = pctldev->dev;
108 	int ret, i;
109 	const char *function;
110 	u32 val;
111 	unsigned long config;
112 	unsigned long *configs = NULL;
113 	unsigned num_configs = 0;
114 	unsigned reserve;
115 	struct property *prop;
116 	const char *group;
117 
118 	ret = of_property_read_string(np, "nvidia,function", &function);
119 	if (ret < 0) {
120 		/* EINVAL=missing, which is fine since it's optional */
121 		if (ret != -EINVAL)
122 			dev_err(dev,
123 				"could not parse property nvidia,function\n");
124 		function = NULL;
125 	}
126 
127 	for (i = 0; i < ARRAY_SIZE(cfg_params); i++) {
128 		ret = of_property_read_u32(np, cfg_params[i].property, &val);
129 		if (!ret) {
130 			config = TEGRA_PINCONF_PACK(cfg_params[i].param, val);
131 			ret = pinctrl_utils_add_config(pctldev, &configs,
132 					&num_configs, config);
133 			if (ret < 0)
134 				goto exit;
135 		/* EINVAL=missing, which is fine since it's optional */
136 		} else if (ret != -EINVAL) {
137 			dev_err(dev, "could not parse property %s\n",
138 				cfg_params[i].property);
139 		}
140 	}
141 
142 	reserve = 0;
143 	if (function != NULL)
144 		reserve++;
145 	if (num_configs)
146 		reserve++;
147 	ret = of_property_count_strings(np, "nvidia,pins");
148 	if (ret < 0) {
149 		dev_err(dev, "could not parse property nvidia,pins\n");
150 		goto exit;
151 	}
152 	reserve *= ret;
153 
154 	ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps,
155 					num_maps, reserve);
156 	if (ret < 0)
157 		goto exit;
158 
159 	of_property_for_each_string(np, "nvidia,pins", prop, group) {
160 		if (function) {
161 			ret = pinctrl_utils_add_map_mux(pctldev, map,
162 					reserved_maps, num_maps, group,
163 					function);
164 			if (ret < 0)
165 				goto exit;
166 		}
167 
168 		if (num_configs) {
169 			ret = pinctrl_utils_add_map_configs(pctldev, map,
170 					reserved_maps, num_maps, group,
171 					configs, num_configs,
172 					PIN_MAP_TYPE_CONFIGS_GROUP);
173 			if (ret < 0)
174 				goto exit;
175 		}
176 	}
177 
178 	ret = 0;
179 
180 exit:
181 	kfree(configs);
182 	return ret;
183 }
184 
tegra_pinctrl_dt_node_to_map(struct pinctrl_dev * pctldev,struct device_node * np_config,struct pinctrl_map ** map,unsigned * num_maps)185 static int tegra_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
186 					struct device_node *np_config,
187 					struct pinctrl_map **map,
188 					unsigned *num_maps)
189 {
190 	unsigned reserved_maps;
191 	struct device_node *np;
192 	int ret;
193 
194 	reserved_maps = 0;
195 	*map = NULL;
196 	*num_maps = 0;
197 
198 	for_each_child_of_node(np_config, np) {
199 		ret = tegra_pinctrl_dt_subnode_to_map(pctldev, np, map,
200 						      &reserved_maps, num_maps);
201 		if (ret < 0) {
202 			pinctrl_utils_free_map(pctldev, *map,
203 				*num_maps);
204 			of_node_put(np);
205 			return ret;
206 		}
207 	}
208 
209 	return 0;
210 }
211 
212 static const struct pinctrl_ops tegra_pinctrl_ops = {
213 	.get_groups_count = tegra_pinctrl_get_groups_count,
214 	.get_group_name = tegra_pinctrl_get_group_name,
215 	.get_group_pins = tegra_pinctrl_get_group_pins,
216 #ifdef CONFIG_DEBUG_FS
217 	.pin_dbg_show = tegra_pinctrl_pin_dbg_show,
218 #endif
219 	.dt_node_to_map = tegra_pinctrl_dt_node_to_map,
220 	.dt_free_map = pinctrl_utils_free_map,
221 };
222 
tegra_pinctrl_get_funcs_count(struct pinctrl_dev * pctldev)223 static int tegra_pinctrl_get_funcs_count(struct pinctrl_dev *pctldev)
224 {
225 	struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
226 
227 	return pmx->soc->nfunctions;
228 }
229 
tegra_pinctrl_get_func_name(struct pinctrl_dev * pctldev,unsigned function)230 static const char *tegra_pinctrl_get_func_name(struct pinctrl_dev *pctldev,
231 					       unsigned function)
232 {
233 	struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
234 
235 	return pmx->functions[function].name;
236 }
237 
tegra_pinctrl_get_func_groups(struct pinctrl_dev * pctldev,unsigned function,const char * const ** groups,unsigned * const num_groups)238 static int tegra_pinctrl_get_func_groups(struct pinctrl_dev *pctldev,
239 					 unsigned function,
240 					 const char * const **groups,
241 					 unsigned * const num_groups)
242 {
243 	struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
244 
245 	*groups = pmx->functions[function].groups;
246 	*num_groups = pmx->functions[function].ngroups;
247 
248 	return 0;
249 }
250 
tegra_pinctrl_set_mux(struct pinctrl_dev * pctldev,unsigned function,unsigned group)251 static int tegra_pinctrl_set_mux(struct pinctrl_dev *pctldev,
252 				 unsigned function,
253 				 unsigned group)
254 {
255 	struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
256 	const struct tegra_pingroup *g;
257 	int i;
258 	u32 val;
259 
260 	g = &pmx->soc->groups[group];
261 
262 	if (WARN_ON(g->mux_reg < 0))
263 		return -EINVAL;
264 
265 	for (i = 0; i < ARRAY_SIZE(g->funcs); i++) {
266 		if (g->funcs[i] == function)
267 			break;
268 	}
269 	if (WARN_ON(i == ARRAY_SIZE(g->funcs)))
270 		return -EINVAL;
271 
272 	val = pmx_readl(pmx, g->mux_bank, g->mux_reg);
273 	val &= ~(0x3 << g->mux_bit);
274 	val |= i << g->mux_bit;
275 	pmx_writel(pmx, val, g->mux_bank, g->mux_reg);
276 
277 	return 0;
278 }
279 
tegra_pinctrl_get_group(struct pinctrl_dev * pctldev,unsigned int offset)280 static const struct tegra_pingroup *tegra_pinctrl_get_group(struct pinctrl_dev *pctldev,
281 					unsigned int offset)
282 {
283 	struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
284 	unsigned int group, num_pins, j;
285 	const unsigned int *pins;
286 	int ret;
287 
288 	for (group = 0; group < pmx->soc->ngroups; ++group) {
289 		ret = tegra_pinctrl_get_group_pins(pctldev, group, &pins, &num_pins);
290 		if (ret < 0)
291 			continue;
292 		for (j = 0; j < num_pins; j++) {
293 			if (offset == pins[j])
294 				return &pmx->soc->groups[group];
295 		}
296 	}
297 
298 	dev_err(pctldev->dev, "Pingroup not found for pin %u\n", offset);
299 	return NULL;
300 }
301 
tegra_pinctrl_gpio_request_enable(struct pinctrl_dev * pctldev,struct pinctrl_gpio_range * range,unsigned int offset)302 static int tegra_pinctrl_gpio_request_enable(struct pinctrl_dev *pctldev,
303 					     struct pinctrl_gpio_range *range,
304 					     unsigned int offset)
305 {
306 	struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
307 	const struct tegra_pingroup *group;
308 	u32 value;
309 
310 	if (!pmx->soc->sfsel_in_mux)
311 		return 0;
312 
313 	group = tegra_pinctrl_get_group(pctldev, offset);
314 
315 	if (!group)
316 		return -EINVAL;
317 
318 	if (group->mux_reg < 0 || group->sfsel_bit < 0)
319 		return -EINVAL;
320 
321 	value = pmx_readl(pmx, group->mux_bank, group->mux_reg);
322 	value &= ~BIT(group->sfsel_bit);
323 	pmx_writel(pmx, value, group->mux_bank, group->mux_reg);
324 
325 	return 0;
326 }
327 
tegra_pinctrl_gpio_disable_free(struct pinctrl_dev * pctldev,struct pinctrl_gpio_range * range,unsigned int offset)328 static void tegra_pinctrl_gpio_disable_free(struct pinctrl_dev *pctldev,
329 					    struct pinctrl_gpio_range *range,
330 					    unsigned int offset)
331 {
332 	struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
333 	const struct tegra_pingroup *group;
334 	u32 value;
335 
336 	if (!pmx->soc->sfsel_in_mux)
337 		return;
338 
339 	group = tegra_pinctrl_get_group(pctldev, offset);
340 
341 	if (!group)
342 		return;
343 
344 	if (group->mux_reg < 0 || group->sfsel_bit < 0)
345 		return;
346 
347 	value = pmx_readl(pmx, group->mux_bank, group->mux_reg);
348 	value |= BIT(group->sfsel_bit);
349 	pmx_writel(pmx, value, group->mux_bank, group->mux_reg);
350 }
351 
352 static const struct pinmux_ops tegra_pinmux_ops = {
353 	.get_functions_count = tegra_pinctrl_get_funcs_count,
354 	.get_function_name = tegra_pinctrl_get_func_name,
355 	.get_function_groups = tegra_pinctrl_get_func_groups,
356 	.set_mux = tegra_pinctrl_set_mux,
357 	.gpio_request_enable = tegra_pinctrl_gpio_request_enable,
358 	.gpio_disable_free = tegra_pinctrl_gpio_disable_free,
359 };
360 
tegra_pinconf_reg(struct tegra_pmx * pmx,const struct tegra_pingroup * g,enum tegra_pinconf_param param,bool report_err,s8 * bank,s32 * reg,s8 * bit,s8 * width)361 static int tegra_pinconf_reg(struct tegra_pmx *pmx,
362 			     const struct tegra_pingroup *g,
363 			     enum tegra_pinconf_param param,
364 			     bool report_err,
365 			     s8 *bank, s32 *reg, s8 *bit, s8 *width)
366 {
367 	switch (param) {
368 	case TEGRA_PINCONF_PARAM_PULL:
369 		*bank = g->pupd_bank;
370 		*reg = g->pupd_reg;
371 		*bit = g->pupd_bit;
372 		*width = 2;
373 		break;
374 	case TEGRA_PINCONF_PARAM_TRISTATE:
375 		*bank = g->tri_bank;
376 		*reg = g->tri_reg;
377 		*bit = g->tri_bit;
378 		*width = 1;
379 		break;
380 	case TEGRA_PINCONF_PARAM_ENABLE_INPUT:
381 		*bank = g->mux_bank;
382 		*reg = g->mux_reg;
383 		*bit = g->einput_bit;
384 		*width = 1;
385 		break;
386 	case TEGRA_PINCONF_PARAM_OPEN_DRAIN:
387 		*bank = g->mux_bank;
388 		*reg = g->mux_reg;
389 		*bit = g->odrain_bit;
390 		*width = 1;
391 		break;
392 	case TEGRA_PINCONF_PARAM_LOCK:
393 		*bank = g->mux_bank;
394 		*reg = g->mux_reg;
395 		*bit = g->lock_bit;
396 		*width = 1;
397 		break;
398 	case TEGRA_PINCONF_PARAM_IORESET:
399 		*bank = g->mux_bank;
400 		*reg = g->mux_reg;
401 		*bit = g->ioreset_bit;
402 		*width = 1;
403 		break;
404 	case TEGRA_PINCONF_PARAM_RCV_SEL:
405 		*bank = g->mux_bank;
406 		*reg = g->mux_reg;
407 		*bit = g->rcv_sel_bit;
408 		*width = 1;
409 		break;
410 	case TEGRA_PINCONF_PARAM_HIGH_SPEED_MODE:
411 		if (pmx->soc->hsm_in_mux) {
412 			*bank = g->mux_bank;
413 			*reg = g->mux_reg;
414 		} else {
415 			*bank = g->drv_bank;
416 			*reg = g->drv_reg;
417 		}
418 		*bit = g->hsm_bit;
419 		*width = 1;
420 		break;
421 	case TEGRA_PINCONF_PARAM_SCHMITT:
422 		if (pmx->soc->schmitt_in_mux) {
423 			*bank = g->mux_bank;
424 			*reg = g->mux_reg;
425 		} else {
426 			*bank = g->drv_bank;
427 			*reg = g->drv_reg;
428 		}
429 		*bit = g->schmitt_bit;
430 		*width = 1;
431 		break;
432 	case TEGRA_PINCONF_PARAM_LOW_POWER_MODE:
433 		*bank = g->drv_bank;
434 		*reg = g->drv_reg;
435 		*bit = g->lpmd_bit;
436 		*width = 2;
437 		break;
438 	case TEGRA_PINCONF_PARAM_DRIVE_DOWN_STRENGTH:
439 		*bank = g->drv_bank;
440 		*reg = g->drv_reg;
441 		*bit = g->drvdn_bit;
442 		*width = g->drvdn_width;
443 		break;
444 	case TEGRA_PINCONF_PARAM_DRIVE_UP_STRENGTH:
445 		*bank = g->drv_bank;
446 		*reg = g->drv_reg;
447 		*bit = g->drvup_bit;
448 		*width = g->drvup_width;
449 		break;
450 	case TEGRA_PINCONF_PARAM_SLEW_RATE_FALLING:
451 		*bank = g->drv_bank;
452 		*reg = g->drv_reg;
453 		*bit = g->slwf_bit;
454 		*width = g->slwf_width;
455 		break;
456 	case TEGRA_PINCONF_PARAM_SLEW_RATE_RISING:
457 		*bank = g->drv_bank;
458 		*reg = g->drv_reg;
459 		*bit = g->slwr_bit;
460 		*width = g->slwr_width;
461 		break;
462 	case TEGRA_PINCONF_PARAM_DRIVE_TYPE:
463 		if (pmx->soc->drvtype_in_mux) {
464 			*bank = g->mux_bank;
465 			*reg = g->mux_reg;
466 		} else {
467 			*bank = g->drv_bank;
468 			*reg = g->drv_reg;
469 		}
470 		*bit = g->drvtype_bit;
471 		*width = 2;
472 		break;
473 	default:
474 		dev_err(pmx->dev, "Invalid config param %04x\n", param);
475 		return -ENOTSUPP;
476 	}
477 
478 	if (*reg < 0 || *bit < 0)  {
479 		if (report_err) {
480 			const char *prop = "unknown";
481 			int i;
482 
483 			for (i = 0; i < ARRAY_SIZE(cfg_params); i++) {
484 				if (cfg_params[i].param == param) {
485 					prop = cfg_params[i].property;
486 					break;
487 				}
488 			}
489 
490 			dev_err(pmx->dev,
491 				"Config param %04x (%s) not supported on group %s\n",
492 				param, prop, g->name);
493 		}
494 		return -ENOTSUPP;
495 	}
496 
497 	return 0;
498 }
499 
tegra_pinconf_get(struct pinctrl_dev * pctldev,unsigned pin,unsigned long * config)500 static int tegra_pinconf_get(struct pinctrl_dev *pctldev,
501 			     unsigned pin, unsigned long *config)
502 {
503 	dev_err(pctldev->dev, "pin_config_get op not supported\n");
504 	return -ENOTSUPP;
505 }
506 
tegra_pinconf_set(struct pinctrl_dev * pctldev,unsigned pin,unsigned long * configs,unsigned num_configs)507 static int tegra_pinconf_set(struct pinctrl_dev *pctldev,
508 			     unsigned pin, unsigned long *configs,
509 			     unsigned num_configs)
510 {
511 	dev_err(pctldev->dev, "pin_config_set op not supported\n");
512 	return -ENOTSUPP;
513 }
514 
tegra_pinconf_group_get(struct pinctrl_dev * pctldev,unsigned group,unsigned long * config)515 static int tegra_pinconf_group_get(struct pinctrl_dev *pctldev,
516 				   unsigned group, unsigned long *config)
517 {
518 	struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
519 	enum tegra_pinconf_param param = TEGRA_PINCONF_UNPACK_PARAM(*config);
520 	u16 arg;
521 	const struct tegra_pingroup *g;
522 	int ret;
523 	s8 bank, bit, width;
524 	s32 reg;
525 	u32 val, mask;
526 
527 	g = &pmx->soc->groups[group];
528 
529 	ret = tegra_pinconf_reg(pmx, g, param, true, &bank, &reg, &bit,
530 				&width);
531 	if (ret < 0)
532 		return ret;
533 
534 	val = pmx_readl(pmx, bank, reg);
535 	mask = (1 << width) - 1;
536 	arg = (val >> bit) & mask;
537 
538 	*config = TEGRA_PINCONF_PACK(param, arg);
539 
540 	return 0;
541 }
542 
tegra_pinconf_group_set(struct pinctrl_dev * pctldev,unsigned group,unsigned long * configs,unsigned num_configs)543 static int tegra_pinconf_group_set(struct pinctrl_dev *pctldev,
544 				   unsigned group, unsigned long *configs,
545 				   unsigned num_configs)
546 {
547 	struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
548 	enum tegra_pinconf_param param;
549 	u16 arg;
550 	const struct tegra_pingroup *g;
551 	int ret, i;
552 	s8 bank, bit, width;
553 	s32 reg;
554 	u32 val, mask;
555 
556 	g = &pmx->soc->groups[group];
557 
558 	for (i = 0; i < num_configs; i++) {
559 		param = TEGRA_PINCONF_UNPACK_PARAM(configs[i]);
560 		arg = TEGRA_PINCONF_UNPACK_ARG(configs[i]);
561 
562 		ret = tegra_pinconf_reg(pmx, g, param, true, &bank, &reg, &bit,
563 					&width);
564 		if (ret < 0)
565 			return ret;
566 
567 		val = pmx_readl(pmx, bank, reg);
568 
569 		/* LOCK can't be cleared */
570 		if (param == TEGRA_PINCONF_PARAM_LOCK) {
571 			if ((val & BIT(bit)) && !arg) {
572 				dev_err(pctldev->dev, "LOCK bit cannot be cleared\n");
573 				return -EINVAL;
574 			}
575 		}
576 
577 		/* Special-case Boolean values; allow any non-zero as true */
578 		if (width == 1)
579 			arg = !!arg;
580 
581 		/* Range-check user-supplied value */
582 		mask = (1 << width) - 1;
583 		if (arg & ~mask) {
584 			dev_err(pctldev->dev,
585 				"config %lx: %x too big for %d bit register\n",
586 				configs[i], arg, width);
587 			return -EINVAL;
588 		}
589 
590 		/* Update register */
591 		val &= ~(mask << bit);
592 		val |= arg << bit;
593 		pmx_writel(pmx, val, bank, reg);
594 	} /* for each config */
595 
596 	return 0;
597 }
598 
599 #ifdef CONFIG_DEBUG_FS
tegra_pinconf_dbg_show(struct pinctrl_dev * pctldev,struct seq_file * s,unsigned offset)600 static void tegra_pinconf_dbg_show(struct pinctrl_dev *pctldev,
601 				   struct seq_file *s, unsigned offset)
602 {
603 }
604 
strip_prefix(const char * s)605 static const char *strip_prefix(const char *s)
606 {
607 	const char *comma = strchr(s, ',');
608 	if (!comma)
609 		return s;
610 
611 	return comma + 1;
612 }
613 
tegra_pinconf_group_dbg_show(struct pinctrl_dev * pctldev,struct seq_file * s,unsigned group)614 static void tegra_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
615 					 struct seq_file *s, unsigned group)
616 {
617 	struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
618 	const struct tegra_pingroup *g;
619 	int i, ret;
620 	s8 bank, bit, width;
621 	s32 reg;
622 	u32 val;
623 
624 	g = &pmx->soc->groups[group];
625 
626 	for (i = 0; i < ARRAY_SIZE(cfg_params); i++) {
627 		ret = tegra_pinconf_reg(pmx, g, cfg_params[i].param, false,
628 					&bank, &reg, &bit, &width);
629 		if (ret < 0)
630 			continue;
631 
632 		val = pmx_readl(pmx, bank, reg);
633 		val >>= bit;
634 		val &= (1 << width) - 1;
635 
636 		seq_printf(s, "\n\t%s=%u",
637 			   strip_prefix(cfg_params[i].property), val);
638 	}
639 }
640 
tegra_pinconf_config_dbg_show(struct pinctrl_dev * pctldev,struct seq_file * s,unsigned long config)641 static void tegra_pinconf_config_dbg_show(struct pinctrl_dev *pctldev,
642 					  struct seq_file *s,
643 					  unsigned long config)
644 {
645 	enum tegra_pinconf_param param = TEGRA_PINCONF_UNPACK_PARAM(config);
646 	u16 arg = TEGRA_PINCONF_UNPACK_ARG(config);
647 	const char *pname = "unknown";
648 	int i;
649 
650 	for (i = 0; i < ARRAY_SIZE(cfg_params); i++) {
651 		if (cfg_params[i].param == param) {
652 			pname = cfg_params[i].property;
653 			break;
654 		}
655 	}
656 
657 	seq_printf(s, "%s=%d", strip_prefix(pname), arg);
658 }
659 #endif
660 
661 static const struct pinconf_ops tegra_pinconf_ops = {
662 	.pin_config_get = tegra_pinconf_get,
663 	.pin_config_set = tegra_pinconf_set,
664 	.pin_config_group_get = tegra_pinconf_group_get,
665 	.pin_config_group_set = tegra_pinconf_group_set,
666 #ifdef CONFIG_DEBUG_FS
667 	.pin_config_dbg_show = tegra_pinconf_dbg_show,
668 	.pin_config_group_dbg_show = tegra_pinconf_group_dbg_show,
669 	.pin_config_config_dbg_show = tegra_pinconf_config_dbg_show,
670 #endif
671 };
672 
tegra_pinctrl_clear_parked_bits(struct tegra_pmx * pmx)673 static void tegra_pinctrl_clear_parked_bits(struct tegra_pmx *pmx)
674 {
675 	int i = 0;
676 	const struct tegra_pingroup *g;
677 	u32 val;
678 
679 	for (i = 0; i < pmx->soc->ngroups; ++i) {
680 		g = &pmx->soc->groups[i];
681 		if (g->parked_bitmask > 0) {
682 			unsigned int bank, reg;
683 
684 			if (g->mux_reg != -1) {
685 				bank = g->mux_bank;
686 				reg = g->mux_reg;
687 			} else {
688 				bank = g->drv_bank;
689 				reg = g->drv_reg;
690 			}
691 
692 			val = pmx_readl(pmx, bank, reg);
693 			val &= ~g->parked_bitmask;
694 			pmx_writel(pmx, val, bank, reg);
695 		}
696 	}
697 }
698 
tegra_pinctrl_get_bank_size(struct device * dev,unsigned int bank_id)699 static size_t tegra_pinctrl_get_bank_size(struct device *dev,
700 					  unsigned int bank_id)
701 {
702 	struct platform_device *pdev = to_platform_device(dev);
703 	struct resource *res;
704 
705 	res = platform_get_resource(pdev, IORESOURCE_MEM, bank_id);
706 
707 	return resource_size(res) / 4;
708 }
709 
tegra_pinctrl_suspend(struct device * dev)710 static int tegra_pinctrl_suspend(struct device *dev)
711 {
712 	struct tegra_pmx *pmx = dev_get_drvdata(dev);
713 	u32 *backup_regs = pmx->backup_regs;
714 	u32 __iomem *regs;
715 	size_t bank_size;
716 	unsigned int i, k;
717 
718 	for (i = 0; i < pmx->nbanks; i++) {
719 		bank_size = tegra_pinctrl_get_bank_size(dev, i);
720 		regs = pmx->regs[i];
721 		for (k = 0; k < bank_size; k++)
722 			*backup_regs++ = readl_relaxed(regs++);
723 	}
724 
725 	return pinctrl_force_sleep(pmx->pctl);
726 }
727 
tegra_pinctrl_resume(struct device * dev)728 static int tegra_pinctrl_resume(struct device *dev)
729 {
730 	struct tegra_pmx *pmx = dev_get_drvdata(dev);
731 	u32 *backup_regs = pmx->backup_regs;
732 	u32 __iomem *regs;
733 	size_t bank_size;
734 	unsigned int i, k;
735 
736 	for (i = 0; i < pmx->nbanks; i++) {
737 		bank_size = tegra_pinctrl_get_bank_size(dev, i);
738 		regs = pmx->regs[i];
739 		for (k = 0; k < bank_size; k++)
740 			writel_relaxed(*backup_regs++, regs++);
741 	}
742 
743 	/* flush all the prior writes */
744 	readl_relaxed(pmx->regs[0]);
745 	/* wait for pinctrl register read to complete */
746 	rmb();
747 	return 0;
748 }
749 
750 DEFINE_NOIRQ_DEV_PM_OPS(tegra_pinctrl_pm, tegra_pinctrl_suspend, tegra_pinctrl_resume);
751 
tegra_pinctrl_gpio_node_has_range(struct tegra_pmx * pmx)752 static bool tegra_pinctrl_gpio_node_has_range(struct tegra_pmx *pmx)
753 {
754 	struct device_node *np;
755 	bool has_prop = false;
756 
757 	np = of_find_compatible_node(NULL, NULL, pmx->soc->gpio_compatible);
758 	if (!np)
759 		return has_prop;
760 
761 	has_prop = of_find_property(np, "gpio-ranges", NULL);
762 
763 	of_node_put(np);
764 
765 	return has_prop;
766 }
767 
tegra_pinctrl_probe(struct platform_device * pdev,const struct tegra_pinctrl_soc_data * soc_data)768 int tegra_pinctrl_probe(struct platform_device *pdev,
769 			const struct tegra_pinctrl_soc_data *soc_data)
770 {
771 	struct tegra_pmx *pmx;
772 	struct resource *res;
773 	int i;
774 	const char **group_pins;
775 	int fn, gn, gfn;
776 	unsigned long backup_regs_size = 0;
777 
778 	pmx = devm_kzalloc(&pdev->dev, sizeof(*pmx), GFP_KERNEL);
779 	if (!pmx)
780 		return -ENOMEM;
781 
782 	pmx->dev = &pdev->dev;
783 	pmx->soc = soc_data;
784 
785 	/*
786 	 * Each mux group will appear in 4 functions' list of groups.
787 	 * This over-allocates slightly, since not all groups are mux groups.
788 	 */
789 	pmx->group_pins = devm_kcalloc(&pdev->dev, pmx->soc->ngroups * 4,
790 				       sizeof(*pmx->group_pins), GFP_KERNEL);
791 	if (!pmx->group_pins)
792 		return -ENOMEM;
793 
794 	pmx->functions = devm_kcalloc(&pdev->dev, pmx->soc->nfunctions,
795 				      sizeof(*pmx->functions), GFP_KERNEL);
796 	if (!pmx->functions)
797 		return -ENOMEM;
798 
799 	group_pins = pmx->group_pins;
800 
801 	for (fn = 0; fn < pmx->soc->nfunctions; fn++) {
802 		struct tegra_function *func = &pmx->functions[fn];
803 
804 		func->name = pmx->soc->functions[fn];
805 		func->groups = group_pins;
806 
807 		for (gn = 0; gn < pmx->soc->ngroups; gn++) {
808 			const struct tegra_pingroup *g = &pmx->soc->groups[gn];
809 
810 			if (g->mux_reg == -1)
811 				continue;
812 
813 			for (gfn = 0; gfn < 4; gfn++)
814 				if (g->funcs[gfn] == fn)
815 					break;
816 			if (gfn == 4)
817 				continue;
818 
819 			BUG_ON(group_pins - pmx->group_pins >=
820 				pmx->soc->ngroups * 4);
821 			*group_pins++ = g->name;
822 			func->ngroups++;
823 		}
824 	}
825 
826 	pmx->gpio_range.name = "Tegra GPIOs";
827 	pmx->gpio_range.id = 0;
828 	pmx->gpio_range.base = 0;
829 	pmx->gpio_range.npins = pmx->soc->ngpios;
830 
831 	pmx->desc.pctlops = &tegra_pinctrl_ops;
832 	pmx->desc.pmxops = &tegra_pinmux_ops;
833 	pmx->desc.confops = &tegra_pinconf_ops;
834 	pmx->desc.owner = THIS_MODULE;
835 	pmx->desc.name = dev_name(&pdev->dev);
836 	pmx->desc.pins = pmx->soc->pins;
837 	pmx->desc.npins = pmx->soc->npins;
838 
839 	for (i = 0; ; i++) {
840 		res = platform_get_resource(pdev, IORESOURCE_MEM, i);
841 		if (!res)
842 			break;
843 		backup_regs_size += resource_size(res);
844 	}
845 	pmx->nbanks = i;
846 
847 	pmx->regs = devm_kcalloc(&pdev->dev, pmx->nbanks, sizeof(*pmx->regs),
848 				 GFP_KERNEL);
849 	if (!pmx->regs)
850 		return -ENOMEM;
851 
852 	pmx->backup_regs = devm_kzalloc(&pdev->dev, backup_regs_size,
853 					GFP_KERNEL);
854 	if (!pmx->backup_regs)
855 		return -ENOMEM;
856 
857 	for (i = 0; i < pmx->nbanks; i++) {
858 		pmx->regs[i] = devm_platform_ioremap_resource(pdev, i);
859 		if (IS_ERR(pmx->regs[i]))
860 			return PTR_ERR(pmx->regs[i]);
861 	}
862 
863 	pmx->pctl = devm_pinctrl_register(&pdev->dev, &pmx->desc, pmx);
864 	if (IS_ERR(pmx->pctl)) {
865 		dev_err(&pdev->dev, "Couldn't register pinctrl driver\n");
866 		return PTR_ERR(pmx->pctl);
867 	}
868 
869 	tegra_pinctrl_clear_parked_bits(pmx);
870 
871 	if (pmx->soc->ngpios > 0 && !tegra_pinctrl_gpio_node_has_range(pmx))
872 		pinctrl_add_gpio_range(pmx->pctl, &pmx->gpio_range);
873 
874 	platform_set_drvdata(pdev, pmx);
875 
876 	dev_dbg(&pdev->dev, "Probed Tegra pinctrl driver\n");
877 
878 	return 0;
879 }
880