1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Intel pinctrl/GPIO core driver.
4  *
5  * Copyright (C) 2015, Intel Corporation
6  * Authors: Mathias Nyman <mathias.nyman@linux.intel.com>
7  *          Mika Westerberg <mika.westerberg@linux.intel.com>
8  */
9 
10 #include <linux/acpi.h>
11 #include <linux/gpio/driver.h>
12 #include <linux/interrupt.h>
13 #include <linux/log2.h>
14 #include <linux/module.h>
15 #include <linux/platform_device.h>
16 #include <linux/property.h>
17 #include <linux/time.h>
18 
19 #include <linux/pinctrl/pinctrl.h>
20 #include <linux/pinctrl/pinmux.h>
21 #include <linux/pinctrl/pinconf.h>
22 #include <linux/pinctrl/pinconf-generic.h>
23 
24 #include "../core.h"
25 #include "pinctrl-intel.h"
26 
27 /* Offset from regs */
28 #define REVID				0x000
29 #define REVID_SHIFT			16
30 #define REVID_MASK			GENMASK(31, 16)
31 
32 #define CAPLIST				0x004
33 #define CAPLIST_ID_SHIFT		16
34 #define CAPLIST_ID_MASK			GENMASK(23, 16)
35 #define CAPLIST_ID_GPIO_HW_INFO		1
36 #define CAPLIST_ID_PWM			2
37 #define CAPLIST_ID_BLINK		3
38 #define CAPLIST_ID_EXP			4
39 #define CAPLIST_NEXT_SHIFT		0
40 #define CAPLIST_NEXT_MASK		GENMASK(15, 0)
41 
42 #define PADBAR				0x00c
43 
44 #define PADOWN_BITS			4
45 #define PADOWN_SHIFT(p)			((p) % 8 * PADOWN_BITS)
46 #define PADOWN_MASK(p)			(GENMASK(3, 0) << PADOWN_SHIFT(p))
47 #define PADOWN_GPP(p)			((p) / 8)
48 
49 /* Offset from pad_regs */
50 #define PADCFG0				0x000
51 #define PADCFG0_RXEVCFG_SHIFT		25
52 #define PADCFG0_RXEVCFG_MASK		GENMASK(26, 25)
53 #define PADCFG0_RXEVCFG_LEVEL		0
54 #define PADCFG0_RXEVCFG_EDGE		1
55 #define PADCFG0_RXEVCFG_DISABLED	2
56 #define PADCFG0_RXEVCFG_EDGE_BOTH	3
57 #define PADCFG0_PREGFRXSEL		BIT(24)
58 #define PADCFG0_RXINV			BIT(23)
59 #define PADCFG0_GPIROUTIOXAPIC		BIT(20)
60 #define PADCFG0_GPIROUTSCI		BIT(19)
61 #define PADCFG0_GPIROUTSMI		BIT(18)
62 #define PADCFG0_GPIROUTNMI		BIT(17)
63 #define PADCFG0_PMODE_SHIFT		10
64 #define PADCFG0_PMODE_MASK		GENMASK(13, 10)
65 #define PADCFG0_PMODE_GPIO		0
66 #define PADCFG0_GPIORXDIS		BIT(9)
67 #define PADCFG0_GPIOTXDIS		BIT(8)
68 #define PADCFG0_GPIORXSTATE		BIT(1)
69 #define PADCFG0_GPIOTXSTATE		BIT(0)
70 
71 #define PADCFG1				0x004
72 #define PADCFG1_TERM_UP			BIT(13)
73 #define PADCFG1_TERM_SHIFT		10
74 #define PADCFG1_TERM_MASK		GENMASK(12, 10)
75 #define PADCFG1_TERM_20K		BIT(2)
76 #define PADCFG1_TERM_5K			BIT(1)
77 #define PADCFG1_TERM_1K			BIT(0)
78 #define PADCFG1_TERM_833		(BIT(1) | BIT(0))
79 
80 #define PADCFG2				0x008
81 #define PADCFG2_DEBEN			BIT(0)
82 #define PADCFG2_DEBOUNCE_SHIFT		1
83 #define PADCFG2_DEBOUNCE_MASK		GENMASK(4, 1)
84 
85 #define DEBOUNCE_PERIOD_NSEC		31250
86 
87 struct intel_pad_context {
88 	u32 padcfg0;
89 	u32 padcfg1;
90 	u32 padcfg2;
91 };
92 
93 struct intel_community_context {
94 	u32 *intmask;
95 	u32 *hostown;
96 };
97 
98 #define pin_to_padno(c, p)	((p) - (c)->pin_base)
99 #define padgroup_offset(g, p)	((p) - (g)->base)
100 
101 static struct intel_community *intel_get_community(struct intel_pinctrl *pctrl,
102 						   unsigned int pin)
103 {
104 	struct intel_community *community;
105 	int i;
106 
107 	for (i = 0; i < pctrl->ncommunities; i++) {
108 		community = &pctrl->communities[i];
109 		if (pin >= community->pin_base &&
110 		    pin < community->pin_base + community->npins)
111 			return community;
112 	}
113 
114 	dev_warn(pctrl->dev, "failed to find community for pin %u\n", pin);
115 	return NULL;
116 }
117 
118 static const struct intel_padgroup *
119 intel_community_get_padgroup(const struct intel_community *community,
120 			     unsigned int pin)
121 {
122 	int i;
123 
124 	for (i = 0; i < community->ngpps; i++) {
125 		const struct intel_padgroup *padgrp = &community->gpps[i];
126 
127 		if (pin >= padgrp->base && pin < padgrp->base + padgrp->size)
128 			return padgrp;
129 	}
130 
131 	return NULL;
132 }
133 
134 static void __iomem *intel_get_padcfg(struct intel_pinctrl *pctrl,
135 				      unsigned int pin, unsigned int reg)
136 {
137 	const struct intel_community *community;
138 	unsigned int padno;
139 	size_t nregs;
140 
141 	community = intel_get_community(pctrl, pin);
142 	if (!community)
143 		return NULL;
144 
145 	padno = pin_to_padno(community, pin);
146 	nregs = (community->features & PINCTRL_FEATURE_DEBOUNCE) ? 4 : 2;
147 
148 	if (reg >= nregs * 4)
149 		return NULL;
150 
151 	return community->pad_regs + reg + padno * nregs * 4;
152 }
153 
154 static bool intel_pad_owned_by_host(struct intel_pinctrl *pctrl, unsigned int pin)
155 {
156 	const struct intel_community *community;
157 	const struct intel_padgroup *padgrp;
158 	unsigned int gpp, offset, gpp_offset;
159 	void __iomem *padown;
160 
161 	community = intel_get_community(pctrl, pin);
162 	if (!community)
163 		return false;
164 	if (!community->padown_offset)
165 		return true;
166 
167 	padgrp = intel_community_get_padgroup(community, pin);
168 	if (!padgrp)
169 		return false;
170 
171 	gpp_offset = padgroup_offset(padgrp, pin);
172 	gpp = PADOWN_GPP(gpp_offset);
173 	offset = community->padown_offset + padgrp->padown_num * 4 + gpp * 4;
174 	padown = community->regs + offset;
175 
176 	return !(readl(padown) & PADOWN_MASK(gpp_offset));
177 }
178 
179 static bool intel_pad_acpi_mode(struct intel_pinctrl *pctrl, unsigned int pin)
180 {
181 	const struct intel_community *community;
182 	const struct intel_padgroup *padgrp;
183 	unsigned int offset, gpp_offset;
184 	void __iomem *hostown;
185 
186 	community = intel_get_community(pctrl, pin);
187 	if (!community)
188 		return true;
189 	if (!community->hostown_offset)
190 		return false;
191 
192 	padgrp = intel_community_get_padgroup(community, pin);
193 	if (!padgrp)
194 		return true;
195 
196 	gpp_offset = padgroup_offset(padgrp, pin);
197 	offset = community->hostown_offset + padgrp->reg_num * 4;
198 	hostown = community->regs + offset;
199 
200 	return !(readl(hostown) & BIT(gpp_offset));
201 }
202 
203 /**
204  * enum - Locking variants of the pad configuration
205  *
206  * @PAD_UNLOCKED:	pad is fully controlled by the configuration registers
207  * @PAD_LOCKED:		pad configuration registers, except TX state, are locked
208  * @PAD_LOCKED_TX:	pad configuration TX state is locked
209  * @PAD_LOCKED_FULL:	pad configuration registers are locked completely
210  *
211  * Locking is considered as read-only mode for corresponding registers and
212  * their respective fields. That said, TX state bit is locked separately from
213  * the main locking scheme.
214  */
215 enum {
216 	PAD_UNLOCKED	= 0,
217 	PAD_LOCKED	= 1,
218 	PAD_LOCKED_TX	= 2,
219 	PAD_LOCKED_FULL	= PAD_LOCKED | PAD_LOCKED_TX,
220 };
221 
222 static int intel_pad_locked(struct intel_pinctrl *pctrl, unsigned int pin)
223 {
224 	struct intel_community *community;
225 	const struct intel_padgroup *padgrp;
226 	unsigned int offset, gpp_offset;
227 	u32 value;
228 	int ret = PAD_UNLOCKED;
229 
230 	community = intel_get_community(pctrl, pin);
231 	if (!community)
232 		return PAD_LOCKED_FULL;
233 	if (!community->padcfglock_offset)
234 		return PAD_UNLOCKED;
235 
236 	padgrp = intel_community_get_padgroup(community, pin);
237 	if (!padgrp)
238 		return PAD_LOCKED_FULL;
239 
240 	gpp_offset = padgroup_offset(padgrp, pin);
241 
242 	/*
243 	 * If PADCFGLOCK and PADCFGLOCKTX bits are both clear for this pad,
244 	 * the pad is considered unlocked. Any other case means that it is
245 	 * either fully or partially locked.
246 	 */
247 	offset = community->padcfglock_offset + 0 + padgrp->reg_num * 8;
248 	value = readl(community->regs + offset);
249 	if (value & BIT(gpp_offset))
250 		ret |= PAD_LOCKED;
251 
252 	offset = community->padcfglock_offset + 4 + padgrp->reg_num * 8;
253 	value = readl(community->regs + offset);
254 	if (value & BIT(gpp_offset))
255 		ret |= PAD_LOCKED_TX;
256 
257 	return ret;
258 }
259 
260 static bool intel_pad_is_unlocked(struct intel_pinctrl *pctrl, unsigned int pin)
261 {
262 	return (intel_pad_locked(pctrl, pin) & PAD_LOCKED) == PAD_UNLOCKED;
263 }
264 
265 static bool intel_pad_usable(struct intel_pinctrl *pctrl, unsigned int pin)
266 {
267 	return intel_pad_owned_by_host(pctrl, pin) && intel_pad_is_unlocked(pctrl, pin);
268 }
269 
270 static int intel_get_groups_count(struct pinctrl_dev *pctldev)
271 {
272 	struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
273 
274 	return pctrl->soc->ngroups;
275 }
276 
277 static const char *intel_get_group_name(struct pinctrl_dev *pctldev,
278 				      unsigned int group)
279 {
280 	struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
281 
282 	return pctrl->soc->groups[group].name;
283 }
284 
285 static int intel_get_group_pins(struct pinctrl_dev *pctldev, unsigned int group,
286 			      const unsigned int **pins, unsigned int *npins)
287 {
288 	struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
289 
290 	*pins = pctrl->soc->groups[group].pins;
291 	*npins = pctrl->soc->groups[group].npins;
292 	return 0;
293 }
294 
295 static void intel_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s,
296 			       unsigned int pin)
297 {
298 	struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
299 	void __iomem *padcfg;
300 	u32 cfg0, cfg1, mode;
301 	int locked;
302 	bool acpi;
303 
304 	if (!intel_pad_owned_by_host(pctrl, pin)) {
305 		seq_puts(s, "not available");
306 		return;
307 	}
308 
309 	cfg0 = readl(intel_get_padcfg(pctrl, pin, PADCFG0));
310 	cfg1 = readl(intel_get_padcfg(pctrl, pin, PADCFG1));
311 
312 	mode = (cfg0 & PADCFG0_PMODE_MASK) >> PADCFG0_PMODE_SHIFT;
313 	if (mode == PADCFG0_PMODE_GPIO)
314 		seq_puts(s, "GPIO ");
315 	else
316 		seq_printf(s, "mode %d ", mode);
317 
318 	seq_printf(s, "0x%08x 0x%08x", cfg0, cfg1);
319 
320 	/* Dump the additional PADCFG registers if available */
321 	padcfg = intel_get_padcfg(pctrl, pin, PADCFG2);
322 	if (padcfg)
323 		seq_printf(s, " 0x%08x", readl(padcfg));
324 
325 	locked = intel_pad_locked(pctrl, pin);
326 	acpi = intel_pad_acpi_mode(pctrl, pin);
327 
328 	if (locked || acpi) {
329 		seq_puts(s, " [");
330 		if (locked)
331 			seq_puts(s, "LOCKED");
332 		if ((locked & PAD_LOCKED_FULL) == PAD_LOCKED_TX)
333 			seq_puts(s, " tx");
334 		else if ((locked & PAD_LOCKED_FULL) == PAD_LOCKED_FULL)
335 			seq_puts(s, " full");
336 
337 		if (locked && acpi)
338 			seq_puts(s, ", ");
339 
340 		if (acpi)
341 			seq_puts(s, "ACPI");
342 		seq_puts(s, "]");
343 	}
344 }
345 
346 static const struct pinctrl_ops intel_pinctrl_ops = {
347 	.get_groups_count = intel_get_groups_count,
348 	.get_group_name = intel_get_group_name,
349 	.get_group_pins = intel_get_group_pins,
350 	.pin_dbg_show = intel_pin_dbg_show,
351 };
352 
353 static int intel_get_functions_count(struct pinctrl_dev *pctldev)
354 {
355 	struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
356 
357 	return pctrl->soc->nfunctions;
358 }
359 
360 static const char *intel_get_function_name(struct pinctrl_dev *pctldev,
361 					   unsigned int function)
362 {
363 	struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
364 
365 	return pctrl->soc->functions[function].name;
366 }
367 
368 static int intel_get_function_groups(struct pinctrl_dev *pctldev,
369 				     unsigned int function,
370 				     const char * const **groups,
371 				     unsigned int * const ngroups)
372 {
373 	struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
374 
375 	*groups = pctrl->soc->functions[function].groups;
376 	*ngroups = pctrl->soc->functions[function].ngroups;
377 	return 0;
378 }
379 
380 static int intel_pinmux_set_mux(struct pinctrl_dev *pctldev,
381 				unsigned int function, unsigned int group)
382 {
383 	struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
384 	const struct intel_pingroup *grp = &pctrl->soc->groups[group];
385 	unsigned long flags;
386 	int i;
387 
388 	raw_spin_lock_irqsave(&pctrl->lock, flags);
389 
390 	/*
391 	 * All pins in the groups needs to be accessible and writable
392 	 * before we can enable the mux for this group.
393 	 */
394 	for (i = 0; i < grp->npins; i++) {
395 		if (!intel_pad_usable(pctrl, grp->pins[i])) {
396 			raw_spin_unlock_irqrestore(&pctrl->lock, flags);
397 			return -EBUSY;
398 		}
399 	}
400 
401 	/* Now enable the mux setting for each pin in the group */
402 	for (i = 0; i < grp->npins; i++) {
403 		void __iomem *padcfg0;
404 		u32 value;
405 
406 		padcfg0 = intel_get_padcfg(pctrl, grp->pins[i], PADCFG0);
407 		value = readl(padcfg0);
408 
409 		value &= ~PADCFG0_PMODE_MASK;
410 
411 		if (grp->modes)
412 			value |= grp->modes[i] << PADCFG0_PMODE_SHIFT;
413 		else
414 			value |= grp->mode << PADCFG0_PMODE_SHIFT;
415 
416 		writel(value, padcfg0);
417 	}
418 
419 	raw_spin_unlock_irqrestore(&pctrl->lock, flags);
420 
421 	return 0;
422 }
423 
424 static void __intel_gpio_set_direction(void __iomem *padcfg0, bool input)
425 {
426 	u32 value;
427 
428 	value = readl(padcfg0);
429 	if (input) {
430 		value &= ~PADCFG0_GPIORXDIS;
431 		value |= PADCFG0_GPIOTXDIS;
432 	} else {
433 		value &= ~PADCFG0_GPIOTXDIS;
434 		value |= PADCFG0_GPIORXDIS;
435 	}
436 	writel(value, padcfg0);
437 }
438 
439 static int intel_gpio_get_gpio_mode(void __iomem *padcfg0)
440 {
441 	return (readl(padcfg0) & PADCFG0_PMODE_MASK) >> PADCFG0_PMODE_SHIFT;
442 }
443 
444 static void intel_gpio_set_gpio_mode(void __iomem *padcfg0)
445 {
446 	u32 value;
447 
448 	value = readl(padcfg0);
449 
450 	/* Put the pad into GPIO mode */
451 	value &= ~PADCFG0_PMODE_MASK;
452 	value |= PADCFG0_PMODE_GPIO;
453 
454 	/* Disable TX buffer and enable RX (this will be input) */
455 	value &= ~PADCFG0_GPIORXDIS;
456 	value |= PADCFG0_GPIOTXDIS;
457 
458 	/* Disable SCI/SMI/NMI generation */
459 	value &= ~(PADCFG0_GPIROUTIOXAPIC | PADCFG0_GPIROUTSCI);
460 	value &= ~(PADCFG0_GPIROUTSMI | PADCFG0_GPIROUTNMI);
461 
462 	writel(value, padcfg0);
463 }
464 
465 static int intel_gpio_request_enable(struct pinctrl_dev *pctldev,
466 				     struct pinctrl_gpio_range *range,
467 				     unsigned int pin)
468 {
469 	struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
470 	void __iomem *padcfg0;
471 	unsigned long flags;
472 
473 	padcfg0 = intel_get_padcfg(pctrl, pin, PADCFG0);
474 
475 	raw_spin_lock_irqsave(&pctrl->lock, flags);
476 
477 	if (!intel_pad_owned_by_host(pctrl, pin)) {
478 		raw_spin_unlock_irqrestore(&pctrl->lock, flags);
479 		return -EBUSY;
480 	}
481 
482 	if (!intel_pad_is_unlocked(pctrl, pin)) {
483 		raw_spin_unlock_irqrestore(&pctrl->lock, flags);
484 		return 0;
485 	}
486 
487 	/*
488 	 * If pin is already configured in GPIO mode, we assume that
489 	 * firmware provides correct settings. In such case we avoid
490 	 * potential glitches on the pin. Otherwise, for the pin in
491 	 * alternative mode, consumer has to supply respective flags.
492 	 */
493 	if (intel_gpio_get_gpio_mode(padcfg0) == PADCFG0_PMODE_GPIO) {
494 		raw_spin_unlock_irqrestore(&pctrl->lock, flags);
495 		return 0;
496 	}
497 
498 	intel_gpio_set_gpio_mode(padcfg0);
499 
500 	raw_spin_unlock_irqrestore(&pctrl->lock, flags);
501 
502 	return 0;
503 }
504 
505 static int intel_gpio_set_direction(struct pinctrl_dev *pctldev,
506 				    struct pinctrl_gpio_range *range,
507 				    unsigned int pin, bool input)
508 {
509 	struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
510 	void __iomem *padcfg0;
511 	unsigned long flags;
512 
513 	padcfg0 = intel_get_padcfg(pctrl, pin, PADCFG0);
514 
515 	raw_spin_lock_irqsave(&pctrl->lock, flags);
516 	__intel_gpio_set_direction(padcfg0, input);
517 	raw_spin_unlock_irqrestore(&pctrl->lock, flags);
518 
519 	return 0;
520 }
521 
522 static const struct pinmux_ops intel_pinmux_ops = {
523 	.get_functions_count = intel_get_functions_count,
524 	.get_function_name = intel_get_function_name,
525 	.get_function_groups = intel_get_function_groups,
526 	.set_mux = intel_pinmux_set_mux,
527 	.gpio_request_enable = intel_gpio_request_enable,
528 	.gpio_set_direction = intel_gpio_set_direction,
529 };
530 
531 static int intel_config_get_pull(struct intel_pinctrl *pctrl, unsigned int pin,
532 				 enum pin_config_param param, u32 *arg)
533 {
534 	const struct intel_community *community;
535 	void __iomem *padcfg1;
536 	unsigned long flags;
537 	u32 value, term;
538 
539 	community = intel_get_community(pctrl, pin);
540 	padcfg1 = intel_get_padcfg(pctrl, pin, PADCFG1);
541 
542 	raw_spin_lock_irqsave(&pctrl->lock, flags);
543 	value = readl(padcfg1);
544 	raw_spin_unlock_irqrestore(&pctrl->lock, flags);
545 
546 	term = (value & PADCFG1_TERM_MASK) >> PADCFG1_TERM_SHIFT;
547 
548 	switch (param) {
549 	case PIN_CONFIG_BIAS_DISABLE:
550 		if (term)
551 			return -EINVAL;
552 		break;
553 
554 	case PIN_CONFIG_BIAS_PULL_UP:
555 		if (!term || !(value & PADCFG1_TERM_UP))
556 			return -EINVAL;
557 
558 		switch (term) {
559 		case PADCFG1_TERM_833:
560 			*arg = 833;
561 			break;
562 		case PADCFG1_TERM_1K:
563 			*arg = 1000;
564 			break;
565 		case PADCFG1_TERM_5K:
566 			*arg = 5000;
567 			break;
568 		case PADCFG1_TERM_20K:
569 			*arg = 20000;
570 			break;
571 		}
572 
573 		break;
574 
575 	case PIN_CONFIG_BIAS_PULL_DOWN:
576 		if (!term || value & PADCFG1_TERM_UP)
577 			return -EINVAL;
578 
579 		switch (term) {
580 		case PADCFG1_TERM_833:
581 			if (!(community->features & PINCTRL_FEATURE_1K_PD))
582 				return -EINVAL;
583 			*arg = 833;
584 			break;
585 		case PADCFG1_TERM_1K:
586 			if (!(community->features & PINCTRL_FEATURE_1K_PD))
587 				return -EINVAL;
588 			*arg = 1000;
589 			break;
590 		case PADCFG1_TERM_5K:
591 			*arg = 5000;
592 			break;
593 		case PADCFG1_TERM_20K:
594 			*arg = 20000;
595 			break;
596 		}
597 
598 		break;
599 
600 	default:
601 		return -EINVAL;
602 	}
603 
604 	return 0;
605 }
606 
607 static int intel_config_get_debounce(struct intel_pinctrl *pctrl, unsigned int pin,
608 				     enum pin_config_param param, u32 *arg)
609 {
610 	void __iomem *padcfg2;
611 	unsigned long flags;
612 	unsigned long v;
613 	u32 value2;
614 
615 	padcfg2 = intel_get_padcfg(pctrl, pin, PADCFG2);
616 	if (!padcfg2)
617 		return -ENOTSUPP;
618 
619 	raw_spin_lock_irqsave(&pctrl->lock, flags);
620 	value2 = readl(padcfg2);
621 	raw_spin_unlock_irqrestore(&pctrl->lock, flags);
622 	if (!(value2 & PADCFG2_DEBEN))
623 		return -EINVAL;
624 
625 	v = (value2 & PADCFG2_DEBOUNCE_MASK) >> PADCFG2_DEBOUNCE_SHIFT;
626 	*arg = BIT(v) * DEBOUNCE_PERIOD_NSEC / NSEC_PER_USEC;
627 
628 	return 0;
629 }
630 
631 static int intel_config_get(struct pinctrl_dev *pctldev, unsigned int pin,
632 			    unsigned long *config)
633 {
634 	struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
635 	enum pin_config_param param = pinconf_to_config_param(*config);
636 	u32 arg = 0;
637 	int ret;
638 
639 	if (!intel_pad_owned_by_host(pctrl, pin))
640 		return -ENOTSUPP;
641 
642 	switch (param) {
643 	case PIN_CONFIG_BIAS_DISABLE:
644 	case PIN_CONFIG_BIAS_PULL_UP:
645 	case PIN_CONFIG_BIAS_PULL_DOWN:
646 		ret = intel_config_get_pull(pctrl, pin, param, &arg);
647 		if (ret)
648 			return ret;
649 		break;
650 
651 	case PIN_CONFIG_INPUT_DEBOUNCE:
652 		ret = intel_config_get_debounce(pctrl, pin, param, &arg);
653 		if (ret)
654 			return ret;
655 		break;
656 
657 	default:
658 		return -ENOTSUPP;
659 	}
660 
661 	*config = pinconf_to_config_packed(param, arg);
662 	return 0;
663 }
664 
665 static int intel_config_set_pull(struct intel_pinctrl *pctrl, unsigned int pin,
666 				 unsigned long config)
667 {
668 	unsigned int param = pinconf_to_config_param(config);
669 	unsigned int arg = pinconf_to_config_argument(config);
670 	const struct intel_community *community;
671 	void __iomem *padcfg1;
672 	unsigned long flags;
673 	int ret = 0;
674 	u32 value;
675 
676 	community = intel_get_community(pctrl, pin);
677 	padcfg1 = intel_get_padcfg(pctrl, pin, PADCFG1);
678 
679 	raw_spin_lock_irqsave(&pctrl->lock, flags);
680 
681 	value = readl(padcfg1);
682 
683 	switch (param) {
684 	case PIN_CONFIG_BIAS_DISABLE:
685 		value &= ~(PADCFG1_TERM_MASK | PADCFG1_TERM_UP);
686 		break;
687 
688 	case PIN_CONFIG_BIAS_PULL_UP:
689 		value &= ~PADCFG1_TERM_MASK;
690 
691 		value |= PADCFG1_TERM_UP;
692 
693 		/* Set default strength value in case none is given */
694 		if (arg == 1)
695 			arg = 5000;
696 
697 		switch (arg) {
698 		case 20000:
699 			value |= PADCFG1_TERM_20K << PADCFG1_TERM_SHIFT;
700 			break;
701 		case 5000:
702 			value |= PADCFG1_TERM_5K << PADCFG1_TERM_SHIFT;
703 			break;
704 		case 1000:
705 			value |= PADCFG1_TERM_1K << PADCFG1_TERM_SHIFT;
706 			break;
707 		case 833:
708 			value |= PADCFG1_TERM_833 << PADCFG1_TERM_SHIFT;
709 			break;
710 		default:
711 			ret = -EINVAL;
712 		}
713 
714 		break;
715 
716 	case PIN_CONFIG_BIAS_PULL_DOWN:
717 		value &= ~(PADCFG1_TERM_UP | PADCFG1_TERM_MASK);
718 
719 		/* Set default strength value in case none is given */
720 		if (arg == 1)
721 			arg = 5000;
722 
723 		switch (arg) {
724 		case 20000:
725 			value |= PADCFG1_TERM_20K << PADCFG1_TERM_SHIFT;
726 			break;
727 		case 5000:
728 			value |= PADCFG1_TERM_5K << PADCFG1_TERM_SHIFT;
729 			break;
730 		case 1000:
731 			if (!(community->features & PINCTRL_FEATURE_1K_PD)) {
732 				ret = -EINVAL;
733 				break;
734 			}
735 			value |= PADCFG1_TERM_1K << PADCFG1_TERM_SHIFT;
736 			break;
737 		case 833:
738 			if (!(community->features & PINCTRL_FEATURE_1K_PD)) {
739 				ret = -EINVAL;
740 				break;
741 			}
742 			value |= PADCFG1_TERM_833 << PADCFG1_TERM_SHIFT;
743 			break;
744 		default:
745 			ret = -EINVAL;
746 		}
747 
748 		break;
749 	}
750 
751 	if (!ret)
752 		writel(value, padcfg1);
753 
754 	raw_spin_unlock_irqrestore(&pctrl->lock, flags);
755 
756 	return ret;
757 }
758 
759 static int intel_config_set_debounce(struct intel_pinctrl *pctrl,
760 				     unsigned int pin, unsigned int debounce)
761 {
762 	void __iomem *padcfg0, *padcfg2;
763 	unsigned long flags;
764 	u32 value0, value2;
765 
766 	padcfg2 = intel_get_padcfg(pctrl, pin, PADCFG2);
767 	if (!padcfg2)
768 		return -ENOTSUPP;
769 
770 	padcfg0 = intel_get_padcfg(pctrl, pin, PADCFG0);
771 
772 	raw_spin_lock_irqsave(&pctrl->lock, flags);
773 
774 	value0 = readl(padcfg0);
775 	value2 = readl(padcfg2);
776 
777 	/* Disable glitch filter and debouncer */
778 	value0 &= ~PADCFG0_PREGFRXSEL;
779 	value2 &= ~(PADCFG2_DEBEN | PADCFG2_DEBOUNCE_MASK);
780 
781 	if (debounce) {
782 		unsigned long v;
783 
784 		v = order_base_2(debounce * NSEC_PER_USEC / DEBOUNCE_PERIOD_NSEC);
785 		if (v < 3 || v > 15) {
786 			raw_spin_unlock_irqrestore(&pctrl->lock, flags);
787 			return -EINVAL;
788 		}
789 
790 		/* Enable glitch filter and debouncer */
791 		value0 |= PADCFG0_PREGFRXSEL;
792 		value2 |= v << PADCFG2_DEBOUNCE_SHIFT;
793 		value2 |= PADCFG2_DEBEN;
794 	}
795 
796 	writel(value0, padcfg0);
797 	writel(value2, padcfg2);
798 
799 	raw_spin_unlock_irqrestore(&pctrl->lock, flags);
800 
801 	return 0;
802 }
803 
804 static int intel_config_set(struct pinctrl_dev *pctldev, unsigned int pin,
805 			  unsigned long *configs, unsigned int nconfigs)
806 {
807 	struct intel_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
808 	int i, ret;
809 
810 	if (!intel_pad_usable(pctrl, pin))
811 		return -ENOTSUPP;
812 
813 	for (i = 0; i < nconfigs; i++) {
814 		switch (pinconf_to_config_param(configs[i])) {
815 		case PIN_CONFIG_BIAS_DISABLE:
816 		case PIN_CONFIG_BIAS_PULL_UP:
817 		case PIN_CONFIG_BIAS_PULL_DOWN:
818 			ret = intel_config_set_pull(pctrl, pin, configs[i]);
819 			if (ret)
820 				return ret;
821 			break;
822 
823 		case PIN_CONFIG_INPUT_DEBOUNCE:
824 			ret = intel_config_set_debounce(pctrl, pin,
825 				pinconf_to_config_argument(configs[i]));
826 			if (ret)
827 				return ret;
828 			break;
829 
830 		default:
831 			return -ENOTSUPP;
832 		}
833 	}
834 
835 	return 0;
836 }
837 
838 static const struct pinconf_ops intel_pinconf_ops = {
839 	.is_generic = true,
840 	.pin_config_get = intel_config_get,
841 	.pin_config_set = intel_config_set,
842 };
843 
844 static const struct pinctrl_desc intel_pinctrl_desc = {
845 	.pctlops = &intel_pinctrl_ops,
846 	.pmxops = &intel_pinmux_ops,
847 	.confops = &intel_pinconf_ops,
848 	.owner = THIS_MODULE,
849 };
850 
851 /**
852  * intel_gpio_to_pin() - Translate from GPIO offset to pin number
853  * @pctrl: Pinctrl structure
854  * @offset: GPIO offset from gpiolib
855  * @community: Community is filled here if not %NULL
856  * @padgrp: Pad group is filled here if not %NULL
857  *
858  * When coming through gpiolib irqchip, the GPIO offset is not
859  * automatically translated to pinctrl pin number. This function can be
860  * used to find out the corresponding pinctrl pin.
861  *
862  * Return: a pin number and pointers to the community and pad group, which
863  * the pin belongs to, or negative error code if translation can't be done.
864  */
865 static int intel_gpio_to_pin(struct intel_pinctrl *pctrl, unsigned int offset,
866 			     const struct intel_community **community,
867 			     const struct intel_padgroup **padgrp)
868 {
869 	int i;
870 
871 	for (i = 0; i < pctrl->ncommunities; i++) {
872 		const struct intel_community *comm = &pctrl->communities[i];
873 		int j;
874 
875 		for (j = 0; j < comm->ngpps; j++) {
876 			const struct intel_padgroup *pgrp = &comm->gpps[j];
877 
878 			if (pgrp->gpio_base == INTEL_GPIO_BASE_NOMAP)
879 				continue;
880 
881 			if (offset >= pgrp->gpio_base &&
882 			    offset < pgrp->gpio_base + pgrp->size) {
883 				int pin;
884 
885 				pin = pgrp->base + offset - pgrp->gpio_base;
886 				if (community)
887 					*community = comm;
888 				if (padgrp)
889 					*padgrp = pgrp;
890 
891 				return pin;
892 			}
893 		}
894 	}
895 
896 	return -EINVAL;
897 }
898 
899 /**
900  * intel_pin_to_gpio() - Translate from pin number to GPIO offset
901  * @pctrl: Pinctrl structure
902  * @pin: pin number
903  *
904  * Translate the pin number of pinctrl to GPIO offset
905  *
906  * Return: a GPIO offset, or negative error code if translation can't be done.
907  */
908 static __maybe_unused int intel_pin_to_gpio(struct intel_pinctrl *pctrl, int pin)
909 {
910 	const struct intel_community *community;
911 	const struct intel_padgroup *padgrp;
912 
913 	community = intel_get_community(pctrl, pin);
914 	if (!community)
915 		return -EINVAL;
916 
917 	padgrp = intel_community_get_padgroup(community, pin);
918 	if (!padgrp)
919 		return -EINVAL;
920 
921 	return pin - padgrp->base + padgrp->gpio_base;
922 }
923 
924 static int intel_gpio_get(struct gpio_chip *chip, unsigned int offset)
925 {
926 	struct intel_pinctrl *pctrl = gpiochip_get_data(chip);
927 	void __iomem *reg;
928 	u32 padcfg0;
929 	int pin;
930 
931 	pin = intel_gpio_to_pin(pctrl, offset, NULL, NULL);
932 	if (pin < 0)
933 		return -EINVAL;
934 
935 	reg = intel_get_padcfg(pctrl, pin, PADCFG0);
936 	if (!reg)
937 		return -EINVAL;
938 
939 	padcfg0 = readl(reg);
940 	if (!(padcfg0 & PADCFG0_GPIOTXDIS))
941 		return !!(padcfg0 & PADCFG0_GPIOTXSTATE);
942 
943 	return !!(padcfg0 & PADCFG0_GPIORXSTATE);
944 }
945 
946 static void intel_gpio_set(struct gpio_chip *chip, unsigned int offset,
947 			   int value)
948 {
949 	struct intel_pinctrl *pctrl = gpiochip_get_data(chip);
950 	unsigned long flags;
951 	void __iomem *reg;
952 	u32 padcfg0;
953 	int pin;
954 
955 	pin = intel_gpio_to_pin(pctrl, offset, NULL, NULL);
956 	if (pin < 0)
957 		return;
958 
959 	reg = intel_get_padcfg(pctrl, pin, PADCFG0);
960 	if (!reg)
961 		return;
962 
963 	raw_spin_lock_irqsave(&pctrl->lock, flags);
964 	padcfg0 = readl(reg);
965 	if (value)
966 		padcfg0 |= PADCFG0_GPIOTXSTATE;
967 	else
968 		padcfg0 &= ~PADCFG0_GPIOTXSTATE;
969 	writel(padcfg0, reg);
970 	raw_spin_unlock_irqrestore(&pctrl->lock, flags);
971 }
972 
973 static int intel_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
974 {
975 	struct intel_pinctrl *pctrl = gpiochip_get_data(chip);
976 	unsigned long flags;
977 	void __iomem *reg;
978 	u32 padcfg0;
979 	int pin;
980 
981 	pin = intel_gpio_to_pin(pctrl, offset, NULL, NULL);
982 	if (pin < 0)
983 		return -EINVAL;
984 
985 	reg = intel_get_padcfg(pctrl, pin, PADCFG0);
986 	if (!reg)
987 		return -EINVAL;
988 
989 	raw_spin_lock_irqsave(&pctrl->lock, flags);
990 	padcfg0 = readl(reg);
991 	raw_spin_unlock_irqrestore(&pctrl->lock, flags);
992 	if (padcfg0 & PADCFG0_PMODE_MASK)
993 		return -EINVAL;
994 
995 	if (padcfg0 & PADCFG0_GPIOTXDIS)
996 		return GPIO_LINE_DIRECTION_IN;
997 
998 	return GPIO_LINE_DIRECTION_OUT;
999 }
1000 
1001 static int intel_gpio_direction_input(struct gpio_chip *chip, unsigned int offset)
1002 {
1003 	return pinctrl_gpio_direction_input(chip->base + offset);
1004 }
1005 
1006 static int intel_gpio_direction_output(struct gpio_chip *chip, unsigned int offset,
1007 				       int value)
1008 {
1009 	intel_gpio_set(chip, offset, value);
1010 	return pinctrl_gpio_direction_output(chip->base + offset);
1011 }
1012 
1013 static const struct gpio_chip intel_gpio_chip = {
1014 	.owner = THIS_MODULE,
1015 	.request = gpiochip_generic_request,
1016 	.free = gpiochip_generic_free,
1017 	.get_direction = intel_gpio_get_direction,
1018 	.direction_input = intel_gpio_direction_input,
1019 	.direction_output = intel_gpio_direction_output,
1020 	.get = intel_gpio_get,
1021 	.set = intel_gpio_set,
1022 	.set_config = gpiochip_generic_config,
1023 };
1024 
1025 static void intel_gpio_irq_ack(struct irq_data *d)
1026 {
1027 	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
1028 	struct intel_pinctrl *pctrl = gpiochip_get_data(gc);
1029 	const struct intel_community *community;
1030 	const struct intel_padgroup *padgrp;
1031 	int pin;
1032 
1033 	pin = intel_gpio_to_pin(pctrl, irqd_to_hwirq(d), &community, &padgrp);
1034 	if (pin >= 0) {
1035 		unsigned int gpp, gpp_offset, is_offset;
1036 
1037 		gpp = padgrp->reg_num;
1038 		gpp_offset = padgroup_offset(padgrp, pin);
1039 		is_offset = community->is_offset + gpp * 4;
1040 
1041 		raw_spin_lock(&pctrl->lock);
1042 		writel(BIT(gpp_offset), community->regs + is_offset);
1043 		raw_spin_unlock(&pctrl->lock);
1044 	}
1045 }
1046 
1047 static void intel_gpio_irq_mask_unmask(struct gpio_chip *gc, irq_hw_number_t hwirq, bool mask)
1048 {
1049 	struct intel_pinctrl *pctrl = gpiochip_get_data(gc);
1050 	const struct intel_community *community;
1051 	const struct intel_padgroup *padgrp;
1052 	int pin;
1053 
1054 	pin = intel_gpio_to_pin(pctrl, hwirq, &community, &padgrp);
1055 	if (pin >= 0) {
1056 		unsigned int gpp, gpp_offset;
1057 		unsigned long flags;
1058 		void __iomem *reg, *is;
1059 		u32 value;
1060 
1061 		gpp = padgrp->reg_num;
1062 		gpp_offset = padgroup_offset(padgrp, pin);
1063 
1064 		reg = community->regs + community->ie_offset + gpp * 4;
1065 		is = community->regs + community->is_offset + gpp * 4;
1066 
1067 		raw_spin_lock_irqsave(&pctrl->lock, flags);
1068 
1069 		/* Clear interrupt status first to avoid unexpected interrupt */
1070 		writel(BIT(gpp_offset), is);
1071 
1072 		value = readl(reg);
1073 		if (mask)
1074 			value &= ~BIT(gpp_offset);
1075 		else
1076 			value |= BIT(gpp_offset);
1077 		writel(value, reg);
1078 		raw_spin_unlock_irqrestore(&pctrl->lock, flags);
1079 	}
1080 }
1081 
1082 static void intel_gpio_irq_mask(struct irq_data *d)
1083 {
1084 	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
1085 	irq_hw_number_t hwirq = irqd_to_hwirq(d);
1086 
1087 	intel_gpio_irq_mask_unmask(gc, hwirq, true);
1088 	gpiochip_disable_irq(gc, hwirq);
1089 }
1090 
1091 static void intel_gpio_irq_unmask(struct irq_data *d)
1092 {
1093 	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
1094 	irq_hw_number_t hwirq = irqd_to_hwirq(d);
1095 
1096 	gpiochip_enable_irq(gc, hwirq);
1097 	intel_gpio_irq_mask_unmask(gc, hwirq, false);
1098 }
1099 
1100 static int intel_gpio_irq_type(struct irq_data *d, unsigned int type)
1101 {
1102 	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
1103 	struct intel_pinctrl *pctrl = gpiochip_get_data(gc);
1104 	unsigned int pin = intel_gpio_to_pin(pctrl, irqd_to_hwirq(d), NULL, NULL);
1105 	unsigned long flags;
1106 	void __iomem *reg;
1107 	u32 value;
1108 
1109 	reg = intel_get_padcfg(pctrl, pin, PADCFG0);
1110 	if (!reg)
1111 		return -EINVAL;
1112 
1113 	/*
1114 	 * If the pin is in ACPI mode it is still usable as a GPIO but it
1115 	 * cannot be used as IRQ because GPI_IS status bit will not be
1116 	 * updated by the host controller hardware.
1117 	 */
1118 	if (intel_pad_acpi_mode(pctrl, pin)) {
1119 		dev_warn(pctrl->dev, "pin %u cannot be used as IRQ\n", pin);
1120 		return -EPERM;
1121 	}
1122 
1123 	raw_spin_lock_irqsave(&pctrl->lock, flags);
1124 
1125 	intel_gpio_set_gpio_mode(reg);
1126 
1127 	value = readl(reg);
1128 
1129 	value &= ~(PADCFG0_RXEVCFG_MASK | PADCFG0_RXINV);
1130 
1131 	if ((type & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH) {
1132 		value |= PADCFG0_RXEVCFG_EDGE_BOTH << PADCFG0_RXEVCFG_SHIFT;
1133 	} else if (type & IRQ_TYPE_EDGE_FALLING) {
1134 		value |= PADCFG0_RXEVCFG_EDGE << PADCFG0_RXEVCFG_SHIFT;
1135 		value |= PADCFG0_RXINV;
1136 	} else if (type & IRQ_TYPE_EDGE_RISING) {
1137 		value |= PADCFG0_RXEVCFG_EDGE << PADCFG0_RXEVCFG_SHIFT;
1138 	} else if (type & IRQ_TYPE_LEVEL_MASK) {
1139 		if (type & IRQ_TYPE_LEVEL_LOW)
1140 			value |= PADCFG0_RXINV;
1141 	} else {
1142 		value |= PADCFG0_RXEVCFG_DISABLED << PADCFG0_RXEVCFG_SHIFT;
1143 	}
1144 
1145 	writel(value, reg);
1146 
1147 	if (type & IRQ_TYPE_EDGE_BOTH)
1148 		irq_set_handler_locked(d, handle_edge_irq);
1149 	else if (type & IRQ_TYPE_LEVEL_MASK)
1150 		irq_set_handler_locked(d, handle_level_irq);
1151 
1152 	raw_spin_unlock_irqrestore(&pctrl->lock, flags);
1153 
1154 	return 0;
1155 }
1156 
1157 static int intel_gpio_irq_wake(struct irq_data *d, unsigned int on)
1158 {
1159 	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
1160 	struct intel_pinctrl *pctrl = gpiochip_get_data(gc);
1161 	unsigned int pin = intel_gpio_to_pin(pctrl, irqd_to_hwirq(d), NULL, NULL);
1162 
1163 	if (on)
1164 		enable_irq_wake(pctrl->irq);
1165 	else
1166 		disable_irq_wake(pctrl->irq);
1167 
1168 	dev_dbg(pctrl->dev, "%sable wake for pin %u\n", on ? "en" : "dis", pin);
1169 	return 0;
1170 }
1171 
1172 static const struct irq_chip intel_gpio_irq_chip = {
1173 	.name = "intel-gpio",
1174 	.irq_ack = intel_gpio_irq_ack,
1175 	.irq_mask = intel_gpio_irq_mask,
1176 	.irq_unmask = intel_gpio_irq_unmask,
1177 	.irq_set_type = intel_gpio_irq_type,
1178 	.irq_set_wake = intel_gpio_irq_wake,
1179 	.flags = IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_IMMUTABLE,
1180 	GPIOCHIP_IRQ_RESOURCE_HELPERS,
1181 };
1182 
1183 static int intel_gpio_community_irq_handler(struct intel_pinctrl *pctrl,
1184 					    const struct intel_community *community)
1185 {
1186 	struct gpio_chip *gc = &pctrl->chip;
1187 	unsigned int gpp;
1188 	int ret = 0;
1189 
1190 	for (gpp = 0; gpp < community->ngpps; gpp++) {
1191 		const struct intel_padgroup *padgrp = &community->gpps[gpp];
1192 		unsigned long pending, enabled, gpp_offset;
1193 
1194 		raw_spin_lock(&pctrl->lock);
1195 
1196 		pending = readl(community->regs + community->is_offset +
1197 				padgrp->reg_num * 4);
1198 		enabled = readl(community->regs + community->ie_offset +
1199 				padgrp->reg_num * 4);
1200 
1201 		raw_spin_unlock(&pctrl->lock);
1202 
1203 		/* Only interrupts that are enabled */
1204 		pending &= enabled;
1205 
1206 		for_each_set_bit(gpp_offset, &pending, padgrp->size) {
1207 			unsigned int irq;
1208 
1209 			irq = irq_find_mapping(gc->irq.domain,
1210 					       padgrp->gpio_base + gpp_offset);
1211 			generic_handle_irq(irq);
1212 		}
1213 
1214 		ret += pending ? 1 : 0;
1215 	}
1216 
1217 	return ret;
1218 }
1219 
1220 static irqreturn_t intel_gpio_irq(int irq, void *data)
1221 {
1222 	const struct intel_community *community;
1223 	struct intel_pinctrl *pctrl = data;
1224 	unsigned int i;
1225 	int ret = 0;
1226 
1227 	/* Need to check all communities for pending interrupts */
1228 	for (i = 0; i < pctrl->ncommunities; i++) {
1229 		community = &pctrl->communities[i];
1230 		ret += intel_gpio_community_irq_handler(pctrl, community);
1231 	}
1232 
1233 	return IRQ_RETVAL(ret);
1234 }
1235 
1236 static void intel_gpio_irq_init(struct intel_pinctrl *pctrl)
1237 {
1238 	int i;
1239 
1240 	for (i = 0; i < pctrl->ncommunities; i++) {
1241 		const struct intel_community *community;
1242 		void __iomem *base;
1243 		unsigned int gpp;
1244 
1245 		community = &pctrl->communities[i];
1246 		base = community->regs;
1247 
1248 		for (gpp = 0; gpp < community->ngpps; gpp++) {
1249 			/* Mask and clear all interrupts */
1250 			writel(0, base + community->ie_offset + gpp * 4);
1251 			writel(0xffff, base + community->is_offset + gpp * 4);
1252 		}
1253 	}
1254 }
1255 
1256 static int intel_gpio_irq_init_hw(struct gpio_chip *gc)
1257 {
1258 	struct intel_pinctrl *pctrl = gpiochip_get_data(gc);
1259 
1260 	/*
1261 	 * Make sure the interrupt lines are in a proper state before
1262 	 * further configuration.
1263 	 */
1264 	intel_gpio_irq_init(pctrl);
1265 
1266 	return 0;
1267 }
1268 
1269 static int intel_gpio_add_community_ranges(struct intel_pinctrl *pctrl,
1270 				const struct intel_community *community)
1271 {
1272 	int ret = 0, i;
1273 
1274 	for (i = 0; i < community->ngpps; i++) {
1275 		const struct intel_padgroup *gpp = &community->gpps[i];
1276 
1277 		if (gpp->gpio_base == INTEL_GPIO_BASE_NOMAP)
1278 			continue;
1279 
1280 		ret = gpiochip_add_pin_range(&pctrl->chip, dev_name(pctrl->dev),
1281 					     gpp->gpio_base, gpp->base,
1282 					     gpp->size);
1283 		if (ret)
1284 			return ret;
1285 	}
1286 
1287 	return ret;
1288 }
1289 
1290 static int intel_gpio_add_pin_ranges(struct gpio_chip *gc)
1291 {
1292 	struct intel_pinctrl *pctrl = gpiochip_get_data(gc);
1293 	int ret, i;
1294 
1295 	for (i = 0; i < pctrl->ncommunities; i++) {
1296 		struct intel_community *community = &pctrl->communities[i];
1297 
1298 		ret = intel_gpio_add_community_ranges(pctrl, community);
1299 		if (ret) {
1300 			dev_err(pctrl->dev, "failed to add GPIO pin range\n");
1301 			return ret;
1302 		}
1303 	}
1304 
1305 	return 0;
1306 }
1307 
1308 static unsigned int intel_gpio_ngpio(const struct intel_pinctrl *pctrl)
1309 {
1310 	const struct intel_community *community;
1311 	unsigned int ngpio = 0;
1312 	int i, j;
1313 
1314 	for (i = 0; i < pctrl->ncommunities; i++) {
1315 		community = &pctrl->communities[i];
1316 		for (j = 0; j < community->ngpps; j++) {
1317 			const struct intel_padgroup *gpp = &community->gpps[j];
1318 
1319 			if (gpp->gpio_base == INTEL_GPIO_BASE_NOMAP)
1320 				continue;
1321 
1322 			if (gpp->gpio_base + gpp->size > ngpio)
1323 				ngpio = gpp->gpio_base + gpp->size;
1324 		}
1325 	}
1326 
1327 	return ngpio;
1328 }
1329 
1330 static int intel_gpio_probe(struct intel_pinctrl *pctrl, int irq)
1331 {
1332 	int ret;
1333 	struct gpio_irq_chip *girq;
1334 
1335 	pctrl->chip = intel_gpio_chip;
1336 
1337 	/* Setup GPIO chip */
1338 	pctrl->chip.ngpio = intel_gpio_ngpio(pctrl);
1339 	pctrl->chip.label = dev_name(pctrl->dev);
1340 	pctrl->chip.parent = pctrl->dev;
1341 	pctrl->chip.base = -1;
1342 	pctrl->chip.add_pin_ranges = intel_gpio_add_pin_ranges;
1343 	pctrl->irq = irq;
1344 
1345 	/*
1346 	 * On some platforms several GPIO controllers share the same interrupt
1347 	 * line.
1348 	 */
1349 	ret = devm_request_irq(pctrl->dev, irq, intel_gpio_irq,
1350 			       IRQF_SHARED | IRQF_NO_THREAD,
1351 			       dev_name(pctrl->dev), pctrl);
1352 	if (ret) {
1353 		dev_err(pctrl->dev, "failed to request interrupt\n");
1354 		return ret;
1355 	}
1356 
1357 	/* Setup IRQ chip */
1358 	girq = &pctrl->chip.irq;
1359 	gpio_irq_chip_set_chip(girq, &intel_gpio_irq_chip);
1360 	/* This will let us handle the IRQ in the driver */
1361 	girq->parent_handler = NULL;
1362 	girq->num_parents = 0;
1363 	girq->default_type = IRQ_TYPE_NONE;
1364 	girq->handler = handle_bad_irq;
1365 	girq->init_hw = intel_gpio_irq_init_hw;
1366 
1367 	ret = devm_gpiochip_add_data(pctrl->dev, &pctrl->chip, pctrl);
1368 	if (ret) {
1369 		dev_err(pctrl->dev, "failed to register gpiochip\n");
1370 		return ret;
1371 	}
1372 
1373 	return 0;
1374 }
1375 
1376 static int intel_pinctrl_add_padgroups_by_gpps(struct intel_pinctrl *pctrl,
1377 					       struct intel_community *community)
1378 {
1379 	struct intel_padgroup *gpps;
1380 	unsigned int padown_num = 0;
1381 	size_t i, ngpps = community->ngpps;
1382 
1383 	gpps = devm_kcalloc(pctrl->dev, ngpps, sizeof(*gpps), GFP_KERNEL);
1384 	if (!gpps)
1385 		return -ENOMEM;
1386 
1387 	for (i = 0; i < ngpps; i++) {
1388 		gpps[i] = community->gpps[i];
1389 
1390 		if (gpps[i].size > 32)
1391 			return -EINVAL;
1392 
1393 		/* Special treatment for GPIO base */
1394 		switch (gpps[i].gpio_base) {
1395 			case INTEL_GPIO_BASE_MATCH:
1396 				gpps[i].gpio_base = gpps[i].base;
1397 				break;
1398 			case INTEL_GPIO_BASE_ZERO:
1399 				gpps[i].gpio_base = 0;
1400 				break;
1401 			case INTEL_GPIO_BASE_NOMAP:
1402 				break;
1403 			default:
1404 				break;
1405 		}
1406 
1407 		gpps[i].padown_num = padown_num;
1408 		padown_num += DIV_ROUND_UP(gpps[i].size * 4, 32);
1409 	}
1410 
1411 	community->gpps = gpps;
1412 
1413 	return 0;
1414 }
1415 
1416 static int intel_pinctrl_add_padgroups_by_size(struct intel_pinctrl *pctrl,
1417 					       struct intel_community *community)
1418 {
1419 	struct intel_padgroup *gpps;
1420 	unsigned int npins = community->npins;
1421 	unsigned int padown_num = 0;
1422 	size_t i, ngpps = DIV_ROUND_UP(npins, community->gpp_size);
1423 
1424 	if (community->gpp_size > 32)
1425 		return -EINVAL;
1426 
1427 	gpps = devm_kcalloc(pctrl->dev, ngpps, sizeof(*gpps), GFP_KERNEL);
1428 	if (!gpps)
1429 		return -ENOMEM;
1430 
1431 	for (i = 0; i < ngpps; i++) {
1432 		unsigned int gpp_size = community->gpp_size;
1433 
1434 		gpps[i].reg_num = i;
1435 		gpps[i].base = community->pin_base + i * gpp_size;
1436 		gpps[i].size = min(gpp_size, npins);
1437 		npins -= gpps[i].size;
1438 
1439 		gpps[i].gpio_base = gpps[i].base;
1440 		gpps[i].padown_num = padown_num;
1441 
1442 		/*
1443 		 * In older hardware the number of padown registers per
1444 		 * group is fixed regardless of the group size.
1445 		 */
1446 		if (community->gpp_num_padown_regs)
1447 			padown_num += community->gpp_num_padown_regs;
1448 		else
1449 			padown_num += DIV_ROUND_UP(gpps[i].size * 4, 32);
1450 	}
1451 
1452 	community->ngpps = ngpps;
1453 	community->gpps = gpps;
1454 
1455 	return 0;
1456 }
1457 
1458 static int intel_pinctrl_pm_init(struct intel_pinctrl *pctrl)
1459 {
1460 #ifdef CONFIG_PM_SLEEP
1461 	const struct intel_pinctrl_soc_data *soc = pctrl->soc;
1462 	struct intel_community_context *communities;
1463 	struct intel_pad_context *pads;
1464 	int i;
1465 
1466 	pads = devm_kcalloc(pctrl->dev, soc->npins, sizeof(*pads), GFP_KERNEL);
1467 	if (!pads)
1468 		return -ENOMEM;
1469 
1470 	communities = devm_kcalloc(pctrl->dev, pctrl->ncommunities,
1471 				   sizeof(*communities), GFP_KERNEL);
1472 	if (!communities)
1473 		return -ENOMEM;
1474 
1475 
1476 	for (i = 0; i < pctrl->ncommunities; i++) {
1477 		struct intel_community *community = &pctrl->communities[i];
1478 		u32 *intmask, *hostown;
1479 
1480 		intmask = devm_kcalloc(pctrl->dev, community->ngpps,
1481 				       sizeof(*intmask), GFP_KERNEL);
1482 		if (!intmask)
1483 			return -ENOMEM;
1484 
1485 		communities[i].intmask = intmask;
1486 
1487 		hostown = devm_kcalloc(pctrl->dev, community->ngpps,
1488 				       sizeof(*hostown), GFP_KERNEL);
1489 		if (!hostown)
1490 			return -ENOMEM;
1491 
1492 		communities[i].hostown = hostown;
1493 	}
1494 
1495 	pctrl->context.pads = pads;
1496 	pctrl->context.communities = communities;
1497 #endif
1498 
1499 	return 0;
1500 }
1501 
1502 static int intel_pinctrl_probe(struct platform_device *pdev,
1503 			       const struct intel_pinctrl_soc_data *soc_data)
1504 {
1505 	struct intel_pinctrl *pctrl;
1506 	int i, ret, irq;
1507 
1508 	pctrl = devm_kzalloc(&pdev->dev, sizeof(*pctrl), GFP_KERNEL);
1509 	if (!pctrl)
1510 		return -ENOMEM;
1511 
1512 	pctrl->dev = &pdev->dev;
1513 	pctrl->soc = soc_data;
1514 	raw_spin_lock_init(&pctrl->lock);
1515 
1516 	/*
1517 	 * Make a copy of the communities which we can use to hold pointers
1518 	 * to the registers.
1519 	 */
1520 	pctrl->ncommunities = pctrl->soc->ncommunities;
1521 	pctrl->communities = devm_kcalloc(&pdev->dev, pctrl->ncommunities,
1522 				  sizeof(*pctrl->communities), GFP_KERNEL);
1523 	if (!pctrl->communities)
1524 		return -ENOMEM;
1525 
1526 	for (i = 0; i < pctrl->ncommunities; i++) {
1527 		struct intel_community *community = &pctrl->communities[i];
1528 		void __iomem *regs;
1529 		u32 offset;
1530 		u32 value;
1531 
1532 		*community = pctrl->soc->communities[i];
1533 
1534 		regs = devm_platform_ioremap_resource(pdev, community->barno);
1535 		if (IS_ERR(regs))
1536 			return PTR_ERR(regs);
1537 
1538 		/*
1539 		 * Determine community features based on the revision.
1540 		 * A value of all ones means the device is not present.
1541 		 */
1542 		value = readl(regs + REVID);
1543 		if (value == ~0u)
1544 			return -ENODEV;
1545 		if (((value & REVID_MASK) >> REVID_SHIFT) >= 0x94) {
1546 			community->features |= PINCTRL_FEATURE_DEBOUNCE;
1547 			community->features |= PINCTRL_FEATURE_1K_PD;
1548 		}
1549 
1550 		/* Determine community features based on the capabilities */
1551 		offset = CAPLIST;
1552 		do {
1553 			value = readl(regs + offset);
1554 			switch ((value & CAPLIST_ID_MASK) >> CAPLIST_ID_SHIFT) {
1555 			case CAPLIST_ID_GPIO_HW_INFO:
1556 				community->features |= PINCTRL_FEATURE_GPIO_HW_INFO;
1557 				break;
1558 			case CAPLIST_ID_PWM:
1559 				community->features |= PINCTRL_FEATURE_PWM;
1560 				break;
1561 			case CAPLIST_ID_BLINK:
1562 				community->features |= PINCTRL_FEATURE_BLINK;
1563 				break;
1564 			case CAPLIST_ID_EXP:
1565 				community->features |= PINCTRL_FEATURE_EXP;
1566 				break;
1567 			default:
1568 				break;
1569 			}
1570 			offset = (value & CAPLIST_NEXT_MASK) >> CAPLIST_NEXT_SHIFT;
1571 		} while (offset);
1572 
1573 		dev_dbg(&pdev->dev, "Community%d features: %#08x\n", i, community->features);
1574 
1575 		/* Read offset of the pad configuration registers */
1576 		offset = readl(regs + PADBAR);
1577 
1578 		community->regs = regs;
1579 		community->pad_regs = regs + offset;
1580 
1581 		if (community->gpps)
1582 			ret = intel_pinctrl_add_padgroups_by_gpps(pctrl, community);
1583 		else
1584 			ret = intel_pinctrl_add_padgroups_by_size(pctrl, community);
1585 		if (ret)
1586 			return ret;
1587 	}
1588 
1589 	irq = platform_get_irq(pdev, 0);
1590 	if (irq < 0)
1591 		return irq;
1592 
1593 	ret = intel_pinctrl_pm_init(pctrl);
1594 	if (ret)
1595 		return ret;
1596 
1597 	pctrl->pctldesc = intel_pinctrl_desc;
1598 	pctrl->pctldesc.name = dev_name(&pdev->dev);
1599 	pctrl->pctldesc.pins = pctrl->soc->pins;
1600 	pctrl->pctldesc.npins = pctrl->soc->npins;
1601 
1602 	pctrl->pctldev = devm_pinctrl_register(&pdev->dev, &pctrl->pctldesc,
1603 					       pctrl);
1604 	if (IS_ERR(pctrl->pctldev)) {
1605 		dev_err(&pdev->dev, "failed to register pinctrl driver\n");
1606 		return PTR_ERR(pctrl->pctldev);
1607 	}
1608 
1609 	ret = intel_gpio_probe(pctrl, irq);
1610 	if (ret)
1611 		return ret;
1612 
1613 	platform_set_drvdata(pdev, pctrl);
1614 
1615 	return 0;
1616 }
1617 
1618 int intel_pinctrl_probe_by_hid(struct platform_device *pdev)
1619 {
1620 	const struct intel_pinctrl_soc_data *data;
1621 
1622 	data = device_get_match_data(&pdev->dev);
1623 	if (!data)
1624 		return -ENODATA;
1625 
1626 	return intel_pinctrl_probe(pdev, data);
1627 }
1628 EXPORT_SYMBOL_GPL(intel_pinctrl_probe_by_hid);
1629 
1630 int intel_pinctrl_probe_by_uid(struct platform_device *pdev)
1631 {
1632 	const struct intel_pinctrl_soc_data *data;
1633 
1634 	data = intel_pinctrl_get_soc_data(pdev);
1635 	if (IS_ERR(data))
1636 		return PTR_ERR(data);
1637 
1638 	return intel_pinctrl_probe(pdev, data);
1639 }
1640 EXPORT_SYMBOL_GPL(intel_pinctrl_probe_by_uid);
1641 
1642 const struct intel_pinctrl_soc_data *intel_pinctrl_get_soc_data(struct platform_device *pdev)
1643 {
1644 	const struct intel_pinctrl_soc_data *data = NULL;
1645 	const struct intel_pinctrl_soc_data **table;
1646 	struct acpi_device *adev;
1647 	unsigned int i;
1648 
1649 	adev = ACPI_COMPANION(&pdev->dev);
1650 	if (adev) {
1651 		const void *match = device_get_match_data(&pdev->dev);
1652 
1653 		table = (const struct intel_pinctrl_soc_data **)match;
1654 		for (i = 0; table[i]; i++) {
1655 			if (!strcmp(adev->pnp.unique_id, table[i]->uid)) {
1656 				data = table[i];
1657 				break;
1658 			}
1659 		}
1660 	} else {
1661 		const struct platform_device_id *id;
1662 
1663 		id = platform_get_device_id(pdev);
1664 		if (!id)
1665 			return ERR_PTR(-ENODEV);
1666 
1667 		table = (const struct intel_pinctrl_soc_data **)id->driver_data;
1668 		data = table[pdev->id];
1669 	}
1670 
1671 	return data ?: ERR_PTR(-ENODATA);
1672 }
1673 EXPORT_SYMBOL_GPL(intel_pinctrl_get_soc_data);
1674 
1675 #ifdef CONFIG_PM_SLEEP
1676 static bool intel_pinctrl_should_save(struct intel_pinctrl *pctrl, unsigned int pin)
1677 {
1678 	const struct pin_desc *pd = pin_desc_get(pctrl->pctldev, pin);
1679 
1680 	if (!pd || !intel_pad_usable(pctrl, pin))
1681 		return false;
1682 
1683 	/*
1684 	 * Only restore the pin if it is actually in use by the kernel (or
1685 	 * by userspace). It is possible that some pins are used by the
1686 	 * BIOS during resume and those are not always locked down so leave
1687 	 * them alone.
1688 	 */
1689 	if (pd->mux_owner || pd->gpio_owner ||
1690 	    gpiochip_line_is_irq(&pctrl->chip, intel_pin_to_gpio(pctrl, pin)))
1691 		return true;
1692 
1693 	return false;
1694 }
1695 
1696 int intel_pinctrl_suspend_noirq(struct device *dev)
1697 {
1698 	struct intel_pinctrl *pctrl = dev_get_drvdata(dev);
1699 	struct intel_community_context *communities;
1700 	struct intel_pad_context *pads;
1701 	int i;
1702 
1703 	pads = pctrl->context.pads;
1704 	for (i = 0; i < pctrl->soc->npins; i++) {
1705 		const struct pinctrl_pin_desc *desc = &pctrl->soc->pins[i];
1706 		void __iomem *padcfg;
1707 		u32 val;
1708 
1709 		if (!intel_pinctrl_should_save(pctrl, desc->number))
1710 			continue;
1711 
1712 		val = readl(intel_get_padcfg(pctrl, desc->number, PADCFG0));
1713 		pads[i].padcfg0 = val & ~PADCFG0_GPIORXSTATE;
1714 		val = readl(intel_get_padcfg(pctrl, desc->number, PADCFG1));
1715 		pads[i].padcfg1 = val;
1716 
1717 		padcfg = intel_get_padcfg(pctrl, desc->number, PADCFG2);
1718 		if (padcfg)
1719 			pads[i].padcfg2 = readl(padcfg);
1720 	}
1721 
1722 	communities = pctrl->context.communities;
1723 	for (i = 0; i < pctrl->ncommunities; i++) {
1724 		struct intel_community *community = &pctrl->communities[i];
1725 		void __iomem *base;
1726 		unsigned int gpp;
1727 
1728 		base = community->regs + community->ie_offset;
1729 		for (gpp = 0; gpp < community->ngpps; gpp++)
1730 			communities[i].intmask[gpp] = readl(base + gpp * 4);
1731 
1732 		base = community->regs + community->hostown_offset;
1733 		for (gpp = 0; gpp < community->ngpps; gpp++)
1734 			communities[i].hostown[gpp] = readl(base + gpp * 4);
1735 	}
1736 
1737 	return 0;
1738 }
1739 EXPORT_SYMBOL_GPL(intel_pinctrl_suspend_noirq);
1740 
1741 static bool intel_gpio_update_reg(void __iomem *reg, u32 mask, u32 value)
1742 {
1743 	u32 curr, updated;
1744 
1745 	curr = readl(reg);
1746 
1747 	updated = (curr & ~mask) | (value & mask);
1748 	if (curr == updated)
1749 		return false;
1750 
1751 	writel(updated, reg);
1752 	return true;
1753 }
1754 
1755 static void intel_restore_hostown(struct intel_pinctrl *pctrl, unsigned int c,
1756 				  void __iomem *base, unsigned int gpp, u32 saved)
1757 {
1758 	const struct intel_community *community = &pctrl->communities[c];
1759 	const struct intel_padgroup *padgrp = &community->gpps[gpp];
1760 	struct device *dev = pctrl->dev;
1761 	const char *dummy;
1762 	u32 requested = 0;
1763 	unsigned int i;
1764 
1765 	if (padgrp->gpio_base == INTEL_GPIO_BASE_NOMAP)
1766 		return;
1767 
1768 	for_each_requested_gpio_in_range(&pctrl->chip, i, padgrp->gpio_base, padgrp->size, dummy)
1769 		requested |= BIT(i);
1770 
1771 	if (!intel_gpio_update_reg(base + gpp * 4, requested, saved))
1772 		return;
1773 
1774 	dev_dbg(dev, "restored hostown %u/%u %#08x\n", c, gpp, readl(base + gpp * 4));
1775 }
1776 
1777 static void intel_restore_intmask(struct intel_pinctrl *pctrl, unsigned int c,
1778 				  void __iomem *base, unsigned int gpp, u32 saved)
1779 {
1780 	struct device *dev = pctrl->dev;
1781 
1782 	if (!intel_gpio_update_reg(base + gpp * 4, ~0U, saved))
1783 		return;
1784 
1785 	dev_dbg(dev, "restored mask %u/%u %#08x\n", c, gpp, readl(base + gpp * 4));
1786 }
1787 
1788 static void intel_restore_padcfg(struct intel_pinctrl *pctrl, unsigned int pin,
1789 				 unsigned int reg, u32 saved)
1790 {
1791 	u32 mask = (reg == PADCFG0) ? PADCFG0_GPIORXSTATE : 0;
1792 	unsigned int n = reg / sizeof(u32);
1793 	struct device *dev = pctrl->dev;
1794 	void __iomem *padcfg;
1795 
1796 	padcfg = intel_get_padcfg(pctrl, pin, reg);
1797 	if (!padcfg)
1798 		return;
1799 
1800 	if (!intel_gpio_update_reg(padcfg, ~mask, saved))
1801 		return;
1802 
1803 	dev_dbg(dev, "restored pin %u padcfg%u %#08x\n", pin, n, readl(padcfg));
1804 }
1805 
1806 int intel_pinctrl_resume_noirq(struct device *dev)
1807 {
1808 	struct intel_pinctrl *pctrl = dev_get_drvdata(dev);
1809 	const struct intel_community_context *communities;
1810 	const struct intel_pad_context *pads;
1811 	int i;
1812 
1813 	/* Mask all interrupts */
1814 	intel_gpio_irq_init(pctrl);
1815 
1816 	pads = pctrl->context.pads;
1817 	for (i = 0; i < pctrl->soc->npins; i++) {
1818 		const struct pinctrl_pin_desc *desc = &pctrl->soc->pins[i];
1819 
1820 		if (!intel_pinctrl_should_save(pctrl, desc->number))
1821 			continue;
1822 
1823 		intel_restore_padcfg(pctrl, desc->number, PADCFG0, pads[i].padcfg0);
1824 		intel_restore_padcfg(pctrl, desc->number, PADCFG1, pads[i].padcfg1);
1825 		intel_restore_padcfg(pctrl, desc->number, PADCFG2, pads[i].padcfg2);
1826 	}
1827 
1828 	communities = pctrl->context.communities;
1829 	for (i = 0; i < pctrl->ncommunities; i++) {
1830 		struct intel_community *community = &pctrl->communities[i];
1831 		void __iomem *base;
1832 		unsigned int gpp;
1833 
1834 		base = community->regs + community->ie_offset;
1835 		for (gpp = 0; gpp < community->ngpps; gpp++)
1836 			intel_restore_intmask(pctrl, i, base, gpp, communities[i].intmask[gpp]);
1837 
1838 		base = community->regs + community->hostown_offset;
1839 		for (gpp = 0; gpp < community->ngpps; gpp++)
1840 			intel_restore_hostown(pctrl, i, base, gpp, communities[i].hostown[gpp]);
1841 	}
1842 
1843 	return 0;
1844 }
1845 EXPORT_SYMBOL_GPL(intel_pinctrl_resume_noirq);
1846 #endif
1847 
1848 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@linux.intel.com>");
1849 MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
1850 MODULE_DESCRIPTION("Intel pinctrl/GPIO core driver");
1851 MODULE_LICENSE("GPL v2");
1852