1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Driver for the Atmel PIO4 controller
4  *
5  * Copyright (C) 2015 Atmel,
6  *               2015 Ludovic Desroches <ludovic.desroches@atmel.com>
7  */
8 
9 #include <dt-bindings/pinctrl/at91.h>
10 #include <linux/clk.h>
11 #include <linux/gpio/driver.h>
12 #include <linux/interrupt.h>
13 #include <linux/io.h>
14 #include <linux/init.h>
15 #include <linux/of.h>
16 #include <linux/platform_device.h>
17 #include <linux/pinctrl/pinconf.h>
18 #include <linux/pinctrl/pinconf-generic.h>
19 #include <linux/pinctrl/pinctrl.h>
20 #include <linux/pinctrl/pinmux.h>
21 #include <linux/slab.h>
22 #include "core.h"
23 #include "pinconf.h"
24 #include "pinctrl-utils.h"
25 
26 /*
27  * Warning:
28  * In order to not introduce confusion between Atmel PIO groups and pinctrl
29  * framework groups, Atmel PIO groups will be called banks, line is kept to
30  * designed the pin id into this bank.
31  */
32 
33 #define ATMEL_PIO_MSKR		0x0000
34 #define ATMEL_PIO_CFGR		0x0004
35 #define		ATMEL_PIO_CFGR_FUNC_MASK	GENMASK(2, 0)
36 #define		ATMEL_PIO_DIR_MASK		BIT(8)
37 #define		ATMEL_PIO_PUEN_MASK		BIT(9)
38 #define		ATMEL_PIO_PDEN_MASK		BIT(10)
39 #define		ATMEL_PIO_SR_MASK		BIT(11)
40 #define		ATMEL_PIO_IFEN_MASK		BIT(12)
41 #define		ATMEL_PIO_IFSCEN_MASK		BIT(13)
42 #define		ATMEL_PIO_OPD_MASK		BIT(14)
43 #define		ATMEL_PIO_SCHMITT_MASK		BIT(15)
44 #define		ATMEL_PIO_DRVSTR_MASK		GENMASK(17, 16)
45 #define		ATMEL_PIO_DRVSTR_OFFSET		16
46 #define		ATMEL_PIO_CFGR_EVTSEL_MASK	GENMASK(26, 24)
47 #define		ATMEL_PIO_CFGR_EVTSEL_FALLING	(0 << 24)
48 #define		ATMEL_PIO_CFGR_EVTSEL_RISING	(1 << 24)
49 #define		ATMEL_PIO_CFGR_EVTSEL_BOTH	(2 << 24)
50 #define		ATMEL_PIO_CFGR_EVTSEL_LOW	(3 << 24)
51 #define		ATMEL_PIO_CFGR_EVTSEL_HIGH	(4 << 24)
52 #define ATMEL_PIO_PDSR		0x0008
53 #define ATMEL_PIO_LOCKSR	0x000C
54 #define ATMEL_PIO_SODR		0x0010
55 #define ATMEL_PIO_CODR		0x0014
56 #define ATMEL_PIO_ODSR		0x0018
57 #define ATMEL_PIO_IER		0x0020
58 #define ATMEL_PIO_IDR		0x0024
59 #define ATMEL_PIO_IMR		0x0028
60 #define ATMEL_PIO_ISR		0x002C
61 #define ATMEL_PIO_IOFR		0x003C
62 
63 #define ATMEL_PIO_NPINS_PER_BANK	32
64 #define ATMEL_PIO_BANK(pin_id)		(pin_id / ATMEL_PIO_NPINS_PER_BANK)
65 #define ATMEL_PIO_LINE(pin_id)		(pin_id % ATMEL_PIO_NPINS_PER_BANK)
66 #define ATMEL_PIO_BANK_OFFSET		0x40
67 
68 #define ATMEL_GET_PIN_NO(pinfunc)	((pinfunc) & 0xff)
69 #define ATMEL_GET_PIN_FUNC(pinfunc)	((pinfunc >> 16) & 0xf)
70 #define ATMEL_GET_PIN_IOSET(pinfunc)	((pinfunc >> 20) & 0xf)
71 
72 /* Custom pinconf parameters */
73 #define ATMEL_PIN_CONFIG_DRIVE_STRENGTH	(PIN_CONFIG_END + 1)
74 
75 /**
76  * struct atmel_pioctrl_data - Atmel PIO controller (pinmux + gpio) data struct
77  * @nbanks: number of PIO banks
78  * @last_bank_count: number of lines in the last bank (can be less than
79  *	the rest of the banks).
80  * @slew_rate_support: slew rate support
81  */
82 struct atmel_pioctrl_data {
83 	unsigned int nbanks;
84 	unsigned int last_bank_count;
85 	unsigned int slew_rate_support;
86 };
87 
88 struct atmel_group {
89 	const char *name;
90 	u32 pin;
91 };
92 
93 struct atmel_pin {
94 	unsigned int pin_id;
95 	unsigned int mux;
96 	unsigned int ioset;
97 	unsigned int bank;
98 	unsigned int line;
99 	const char *device;
100 };
101 
102 /**
103  * struct atmel_pioctrl - Atmel PIO controller (pinmux + gpio)
104  * @reg_base: base address of the controller.
105  * @clk: clock of the controller.
106  * @nbanks: number of PIO groups, it can vary depending on the SoC.
107  * @pinctrl_dev: pinctrl device registered.
108  * @groups: groups table to provide group name and pin in the group to pinctrl.
109  * @group_names: group names table to provide all the group/pin names to
110  *     pinctrl or gpio.
111  * @pins: pins table used for both pinctrl and gpio. pin_id, bank and line
112  *     fields are set at probe time. Other ones are set when parsing dt
113  *     pinctrl.
114  * @npins: number of pins.
115  * @gpio_chip: gpio chip registered.
116  * @irq_domain: irq domain for the gpio controller.
117  * @irqs: table containing the hw irq number of the bank. The index of the
118  *     table is the bank id.
119  * @pm_wakeup_sources: bitmap of wakeup sources (lines)
120  * @pm_suspend_backup: backup/restore register values on suspend/resume
121  * @dev: device entry for the Atmel PIO controller.
122  * @node: node of the Atmel PIO controller.
123  * @slew_rate_support: slew rate support
124  */
125 struct atmel_pioctrl {
126 	void __iomem		*reg_base;
127 	struct clk		*clk;
128 	unsigned int		nbanks;
129 	struct pinctrl_dev	*pinctrl_dev;
130 	struct atmel_group	*groups;
131 	const char * const	*group_names;
132 	struct atmel_pin	**pins;
133 	unsigned int		npins;
134 	struct gpio_chip	*gpio_chip;
135 	struct irq_domain	*irq_domain;
136 	int			*irqs;
137 	unsigned int		*pm_wakeup_sources;
138 	struct {
139 		u32		imr;
140 		u32		odsr;
141 		u32		cfgr[ATMEL_PIO_NPINS_PER_BANK];
142 	} *pm_suspend_backup;
143 	struct device		*dev;
144 	struct device_node	*node;
145 	unsigned int		slew_rate_support;
146 };
147 
148 static const char * const atmel_functions[] = {
149 	"GPIO", "A", "B", "C", "D", "E", "F", "G"
150 };
151 
152 static const struct pinconf_generic_params atmel_custom_bindings[] = {
153 	{"atmel,drive-strength", ATMEL_PIN_CONFIG_DRIVE_STRENGTH, 0},
154 };
155 
156 /* --- GPIO --- */
157 static unsigned int atmel_gpio_read(struct atmel_pioctrl *atmel_pioctrl,
158 				    unsigned int bank, unsigned int reg)
159 {
160 	return readl_relaxed(atmel_pioctrl->reg_base
161 			     + ATMEL_PIO_BANK_OFFSET * bank + reg);
162 }
163 
164 static void atmel_gpio_write(struct atmel_pioctrl *atmel_pioctrl,
165 			     unsigned int bank, unsigned int reg,
166 			     unsigned int val)
167 {
168 	writel_relaxed(val, atmel_pioctrl->reg_base
169 		       + ATMEL_PIO_BANK_OFFSET * bank + reg);
170 }
171 
172 static void atmel_gpio_irq_ack(struct irq_data *d)
173 {
174 	/*
175 	 * Nothing to do, interrupt is cleared when reading the status
176 	 * register.
177 	 */
178 }
179 
180 static int atmel_gpio_irq_set_type(struct irq_data *d, unsigned int type)
181 {
182 	struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d);
183 	struct atmel_pin *pin = atmel_pioctrl->pins[d->hwirq];
184 	unsigned int reg;
185 
186 	atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_MSKR,
187 			 BIT(pin->line));
188 	reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR);
189 	reg &= (~ATMEL_PIO_CFGR_EVTSEL_MASK);
190 
191 	switch (type) {
192 	case IRQ_TYPE_EDGE_RISING:
193 		irq_set_handler_locked(d, handle_edge_irq);
194 		reg |= ATMEL_PIO_CFGR_EVTSEL_RISING;
195 		break;
196 	case IRQ_TYPE_EDGE_FALLING:
197 		irq_set_handler_locked(d, handle_edge_irq);
198 		reg |= ATMEL_PIO_CFGR_EVTSEL_FALLING;
199 		break;
200 	case IRQ_TYPE_EDGE_BOTH:
201 		irq_set_handler_locked(d, handle_edge_irq);
202 		reg |= ATMEL_PIO_CFGR_EVTSEL_BOTH;
203 		break;
204 	case IRQ_TYPE_LEVEL_LOW:
205 		irq_set_handler_locked(d, handle_level_irq);
206 		reg |= ATMEL_PIO_CFGR_EVTSEL_LOW;
207 		break;
208 	case IRQ_TYPE_LEVEL_HIGH:
209 		irq_set_handler_locked(d, handle_level_irq);
210 		reg |= ATMEL_PIO_CFGR_EVTSEL_HIGH;
211 		break;
212 	case IRQ_TYPE_NONE:
213 	default:
214 		return -EINVAL;
215 	}
216 
217 	atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR, reg);
218 
219 	return 0;
220 }
221 
222 static void atmel_gpio_irq_mask(struct irq_data *d)
223 {
224 	struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d);
225 	struct atmel_pin *pin = atmel_pioctrl->pins[d->hwirq];
226 
227 	atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_IDR,
228 			 BIT(pin->line));
229 }
230 
231 static void atmel_gpio_irq_unmask(struct irq_data *d)
232 {
233 	struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d);
234 	struct atmel_pin *pin = atmel_pioctrl->pins[d->hwirq];
235 
236 	atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_IER,
237 			 BIT(pin->line));
238 }
239 
240 #ifdef CONFIG_PM_SLEEP
241 
242 static int atmel_gpio_irq_set_wake(struct irq_data *d, unsigned int on)
243 {
244 	struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d);
245 	int bank = ATMEL_PIO_BANK(d->hwirq);
246 	int line = ATMEL_PIO_LINE(d->hwirq);
247 
248 	/* The gpio controller has one interrupt line per bank. */
249 	irq_set_irq_wake(atmel_pioctrl->irqs[bank], on);
250 
251 	if (on)
252 		atmel_pioctrl->pm_wakeup_sources[bank] |= BIT(line);
253 	else
254 		atmel_pioctrl->pm_wakeup_sources[bank] &= ~(BIT(line));
255 
256 	return 0;
257 }
258 #else
259 #define atmel_gpio_irq_set_wake NULL
260 #endif /* CONFIG_PM_SLEEP */
261 
262 static struct irq_chip atmel_gpio_irq_chip = {
263 	.name		= "GPIO",
264 	.irq_ack	= atmel_gpio_irq_ack,
265 	.irq_mask	= atmel_gpio_irq_mask,
266 	.irq_unmask	= atmel_gpio_irq_unmask,
267 	.irq_set_type	= atmel_gpio_irq_set_type,
268 	.irq_set_wake	= atmel_gpio_irq_set_wake,
269 };
270 
271 static int atmel_gpio_to_irq(struct gpio_chip *chip, unsigned int offset)
272 {
273 	struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
274 
275 	return irq_find_mapping(atmel_pioctrl->irq_domain, offset);
276 }
277 
278 static void atmel_gpio_irq_handler(struct irq_desc *desc)
279 {
280 	unsigned int irq = irq_desc_get_irq(desc);
281 	struct atmel_pioctrl *atmel_pioctrl = irq_desc_get_handler_data(desc);
282 	struct irq_chip *chip = irq_desc_get_chip(desc);
283 	unsigned long isr;
284 	int n, bank = -1;
285 
286 	/* Find from which bank is the irq received. */
287 	for (n = 0; n < atmel_pioctrl->nbanks; n++) {
288 		if (atmel_pioctrl->irqs[n] == irq) {
289 			bank = n;
290 			break;
291 		}
292 	}
293 
294 	if (bank < 0) {
295 		dev_err(atmel_pioctrl->dev,
296 			"no bank associated to irq %u\n", irq);
297 		return;
298 	}
299 
300 	chained_irq_enter(chip, desc);
301 
302 	for (;;) {
303 		isr = (unsigned long)atmel_gpio_read(atmel_pioctrl, bank,
304 						     ATMEL_PIO_ISR);
305 		isr &= (unsigned long)atmel_gpio_read(atmel_pioctrl, bank,
306 						      ATMEL_PIO_IMR);
307 		if (!isr)
308 			break;
309 
310 		for_each_set_bit(n, &isr, BITS_PER_LONG)
311 			generic_handle_irq(atmel_gpio_to_irq(
312 					atmel_pioctrl->gpio_chip,
313 					bank * ATMEL_PIO_NPINS_PER_BANK + n));
314 	}
315 
316 	chained_irq_exit(chip, desc);
317 }
318 
319 static int atmel_gpio_direction_input(struct gpio_chip *chip,
320 				      unsigned int offset)
321 {
322 	struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
323 	struct atmel_pin *pin = atmel_pioctrl->pins[offset];
324 	unsigned int reg;
325 
326 	atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_MSKR,
327 			 BIT(pin->line));
328 	reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR);
329 	reg &= ~ATMEL_PIO_DIR_MASK;
330 	atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR, reg);
331 
332 	return 0;
333 }
334 
335 static int atmel_gpio_get(struct gpio_chip *chip, unsigned int offset)
336 {
337 	struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
338 	struct atmel_pin *pin = atmel_pioctrl->pins[offset];
339 	unsigned int reg;
340 
341 	reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_PDSR);
342 
343 	return !!(reg & BIT(pin->line));
344 }
345 
346 static int atmel_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,
347 				   unsigned long *bits)
348 {
349 	struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
350 	unsigned int bank;
351 
352 	bitmap_zero(bits, atmel_pioctrl->npins);
353 
354 	for (bank = 0; bank < atmel_pioctrl->nbanks; bank++) {
355 		unsigned int word = bank;
356 		unsigned int offset = 0;
357 		unsigned int reg;
358 
359 #if ATMEL_PIO_NPINS_PER_BANK != BITS_PER_LONG
360 		word = BIT_WORD(bank * ATMEL_PIO_NPINS_PER_BANK);
361 		offset = bank * ATMEL_PIO_NPINS_PER_BANK % BITS_PER_LONG;
362 #endif
363 		if (!mask[word])
364 			continue;
365 
366 		reg = atmel_gpio_read(atmel_pioctrl, bank, ATMEL_PIO_PDSR);
367 		bits[word] |= mask[word] & (reg << offset);
368 	}
369 
370 	return 0;
371 }
372 
373 static int atmel_gpio_direction_output(struct gpio_chip *chip,
374 				       unsigned int offset,
375 				       int value)
376 {
377 	struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
378 	struct atmel_pin *pin = atmel_pioctrl->pins[offset];
379 	unsigned int reg;
380 
381 	atmel_gpio_write(atmel_pioctrl, pin->bank,
382 			 value ? ATMEL_PIO_SODR : ATMEL_PIO_CODR,
383 			 BIT(pin->line));
384 
385 	atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_MSKR,
386 			 BIT(pin->line));
387 	reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR);
388 	reg |= ATMEL_PIO_DIR_MASK;
389 	atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR, reg);
390 
391 	return 0;
392 }
393 
394 static void atmel_gpio_set(struct gpio_chip *chip, unsigned int offset, int val)
395 {
396 	struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
397 	struct atmel_pin *pin = atmel_pioctrl->pins[offset];
398 
399 	atmel_gpio_write(atmel_pioctrl, pin->bank,
400 			 val ? ATMEL_PIO_SODR : ATMEL_PIO_CODR,
401 			 BIT(pin->line));
402 }
403 
404 static void atmel_gpio_set_multiple(struct gpio_chip *chip, unsigned long *mask,
405 				    unsigned long *bits)
406 {
407 	struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
408 	unsigned int bank;
409 
410 	for (bank = 0; bank < atmel_pioctrl->nbanks; bank++) {
411 		unsigned int bitmask;
412 		unsigned int word = bank;
413 
414 /*
415  * On a 64-bit platform, BITS_PER_LONG is 64 so it is necessary to iterate over
416  * two 32bit words to handle the whole  bitmask
417  */
418 #if ATMEL_PIO_NPINS_PER_BANK != BITS_PER_LONG
419 		word = BIT_WORD(bank * ATMEL_PIO_NPINS_PER_BANK);
420 #endif
421 		if (!mask[word])
422 			continue;
423 
424 		bitmask = mask[word] & bits[word];
425 		atmel_gpio_write(atmel_pioctrl, bank, ATMEL_PIO_SODR, bitmask);
426 
427 		bitmask = mask[word] & ~bits[word];
428 		atmel_gpio_write(atmel_pioctrl, bank, ATMEL_PIO_CODR, bitmask);
429 
430 #if ATMEL_PIO_NPINS_PER_BANK != BITS_PER_LONG
431 		mask[word] >>= ATMEL_PIO_NPINS_PER_BANK;
432 		bits[word] >>= ATMEL_PIO_NPINS_PER_BANK;
433 #endif
434 	}
435 }
436 
437 static struct gpio_chip atmel_gpio_chip = {
438 	.direction_input        = atmel_gpio_direction_input,
439 	.get                    = atmel_gpio_get,
440 	.get_multiple           = atmel_gpio_get_multiple,
441 	.direction_output       = atmel_gpio_direction_output,
442 	.set                    = atmel_gpio_set,
443 	.set_multiple           = atmel_gpio_set_multiple,
444 	.to_irq                 = atmel_gpio_to_irq,
445 	.base                   = 0,
446 };
447 
448 /* --- PINCTRL --- */
449 static unsigned int atmel_pin_config_read(struct pinctrl_dev *pctldev,
450 					  unsigned int pin_id)
451 {
452 	struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
453 	unsigned int bank = atmel_pioctrl->pins[pin_id]->bank;
454 	unsigned int line = atmel_pioctrl->pins[pin_id]->line;
455 	void __iomem *addr = atmel_pioctrl->reg_base
456 			     + bank * ATMEL_PIO_BANK_OFFSET;
457 
458 	writel_relaxed(BIT(line), addr + ATMEL_PIO_MSKR);
459 	/* Have to set MSKR first, to access the right pin CFGR. */
460 	wmb();
461 
462 	return readl_relaxed(addr + ATMEL_PIO_CFGR);
463 }
464 
465 static void atmel_pin_config_write(struct pinctrl_dev *pctldev,
466 				   unsigned int pin_id, u32 conf)
467 {
468 	struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
469 	unsigned int bank = atmel_pioctrl->pins[pin_id]->bank;
470 	unsigned int line = atmel_pioctrl->pins[pin_id]->line;
471 	void __iomem *addr = atmel_pioctrl->reg_base
472 			     + bank * ATMEL_PIO_BANK_OFFSET;
473 
474 	writel_relaxed(BIT(line), addr + ATMEL_PIO_MSKR);
475 	/* Have to set MSKR first, to access the right pin CFGR. */
476 	wmb();
477 	writel_relaxed(conf, addr + ATMEL_PIO_CFGR);
478 }
479 
480 static int atmel_pctl_get_groups_count(struct pinctrl_dev *pctldev)
481 {
482 	struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
483 
484 	return atmel_pioctrl->npins;
485 }
486 
487 static const char *atmel_pctl_get_group_name(struct pinctrl_dev *pctldev,
488 					     unsigned int selector)
489 {
490 	struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
491 
492 	return atmel_pioctrl->groups[selector].name;
493 }
494 
495 static int atmel_pctl_get_group_pins(struct pinctrl_dev *pctldev,
496 				     unsigned int selector,
497 				     const unsigned int **pins,
498 				     unsigned int *num_pins)
499 {
500 	struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
501 
502 	*pins = (unsigned int *)&atmel_pioctrl->groups[selector].pin;
503 	*num_pins = 1;
504 
505 	return 0;
506 }
507 
508 static struct atmel_group *
509 atmel_pctl_find_group_by_pin(struct pinctrl_dev *pctldev, unsigned int pin)
510 {
511 	struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
512 	int i;
513 
514 	for (i = 0; i < atmel_pioctrl->npins; i++) {
515 		struct atmel_group *grp = atmel_pioctrl->groups + i;
516 
517 		if (grp->pin == pin)
518 			return grp;
519 	}
520 
521 	return NULL;
522 }
523 
524 static int atmel_pctl_xlate_pinfunc(struct pinctrl_dev *pctldev,
525 				    struct device_node *np,
526 				    u32 pinfunc, const char **grp_name,
527 				    const char **func_name)
528 {
529 	struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
530 	unsigned int pin_id, func_id;
531 	struct atmel_group *grp;
532 
533 	pin_id = ATMEL_GET_PIN_NO(pinfunc);
534 	func_id = ATMEL_GET_PIN_FUNC(pinfunc);
535 
536 	if (func_id >= ARRAY_SIZE(atmel_functions))
537 		return -EINVAL;
538 
539 	*func_name = atmel_functions[func_id];
540 
541 	grp = atmel_pctl_find_group_by_pin(pctldev, pin_id);
542 	if (!grp)
543 		return -EINVAL;
544 	*grp_name = grp->name;
545 
546 	atmel_pioctrl->pins[pin_id]->mux = func_id;
547 	atmel_pioctrl->pins[pin_id]->ioset = ATMEL_GET_PIN_IOSET(pinfunc);
548 	/* Want the device name not the group one. */
549 	if (np->parent == atmel_pioctrl->node)
550 		atmel_pioctrl->pins[pin_id]->device = np->name;
551 	else
552 		atmel_pioctrl->pins[pin_id]->device = np->parent->name;
553 
554 	return 0;
555 }
556 
557 static int atmel_pctl_dt_subnode_to_map(struct pinctrl_dev *pctldev,
558 					struct device_node *np,
559 					struct pinctrl_map **map,
560 					unsigned int *reserved_maps,
561 					unsigned int *num_maps)
562 {
563 	unsigned int num_pins, num_configs, reserve;
564 	unsigned long *configs;
565 	struct property	*pins;
566 	u32 pinfunc;
567 	int ret, i;
568 
569 	pins = of_find_property(np, "pinmux", NULL);
570 	if (!pins)
571 		return -EINVAL;
572 
573 	ret = pinconf_generic_parse_dt_config(np, pctldev, &configs,
574 					      &num_configs);
575 	if (ret < 0) {
576 		dev_err(pctldev->dev, "%pOF: could not parse node property\n",
577 			np);
578 		return ret;
579 	}
580 
581 	num_pins = pins->length / sizeof(u32);
582 	if (!num_pins) {
583 		dev_err(pctldev->dev, "no pins found in node %pOF\n", np);
584 		ret = -EINVAL;
585 		goto exit;
586 	}
587 
588 	/*
589 	 * Reserve maps, at least there is a mux map and an optional conf
590 	 * map for each pin.
591 	 */
592 	reserve = 1;
593 	if (num_configs)
594 		reserve++;
595 	reserve *= num_pins;
596 	ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps, num_maps,
597 					reserve);
598 	if (ret < 0)
599 		goto exit;
600 
601 	for (i = 0; i < num_pins; i++) {
602 		const char *group, *func;
603 
604 		ret = of_property_read_u32_index(np, "pinmux", i, &pinfunc);
605 		if (ret)
606 			goto exit;
607 
608 		ret = atmel_pctl_xlate_pinfunc(pctldev, np, pinfunc, &group,
609 					       &func);
610 		if (ret)
611 			goto exit;
612 
613 		pinctrl_utils_add_map_mux(pctldev, map, reserved_maps, num_maps,
614 					  group, func);
615 
616 		if (num_configs) {
617 			ret = pinctrl_utils_add_map_configs(pctldev, map,
618 					reserved_maps, num_maps, group,
619 					configs, num_configs,
620 					PIN_MAP_TYPE_CONFIGS_GROUP);
621 			if (ret < 0)
622 				goto exit;
623 		}
624 	}
625 
626 exit:
627 	kfree(configs);
628 	return ret;
629 }
630 
631 static int atmel_pctl_dt_node_to_map(struct pinctrl_dev *pctldev,
632 				     struct device_node *np_config,
633 				     struct pinctrl_map **map,
634 				     unsigned int *num_maps)
635 {
636 	struct device_node *np;
637 	unsigned int reserved_maps;
638 	int ret;
639 
640 	*map = NULL;
641 	*num_maps = 0;
642 	reserved_maps = 0;
643 
644 	/*
645 	 * If all the pins of a device have the same configuration (or no one),
646 	 * it is useless to add a subnode, so directly parse node referenced by
647 	 * phandle.
648 	 */
649 	ret = atmel_pctl_dt_subnode_to_map(pctldev, np_config, map,
650 					   &reserved_maps, num_maps);
651 	if (ret) {
652 		for_each_child_of_node(np_config, np) {
653 			ret = atmel_pctl_dt_subnode_to_map(pctldev, np, map,
654 						    &reserved_maps, num_maps);
655 			if (ret < 0) {
656 				of_node_put(np);
657 				break;
658 			}
659 		}
660 	}
661 
662 	if (ret < 0) {
663 		pinctrl_utils_free_map(pctldev, *map, *num_maps);
664 		dev_err(pctldev->dev, "can't create maps for node %pOF\n",
665 			np_config);
666 	}
667 
668 	return ret;
669 }
670 
671 static const struct pinctrl_ops atmel_pctlops = {
672 	.get_groups_count	= atmel_pctl_get_groups_count,
673 	.get_group_name		= atmel_pctl_get_group_name,
674 	.get_group_pins		= atmel_pctl_get_group_pins,
675 	.dt_node_to_map		= atmel_pctl_dt_node_to_map,
676 	.dt_free_map		= pinctrl_utils_free_map,
677 };
678 
679 static int atmel_pmx_get_functions_count(struct pinctrl_dev *pctldev)
680 {
681 	return ARRAY_SIZE(atmel_functions);
682 }
683 
684 static const char *atmel_pmx_get_function_name(struct pinctrl_dev *pctldev,
685 					       unsigned int selector)
686 {
687 	return atmel_functions[selector];
688 }
689 
690 static int atmel_pmx_get_function_groups(struct pinctrl_dev *pctldev,
691 					 unsigned int selector,
692 					 const char * const **groups,
693 					 unsigned * const num_groups)
694 {
695 	struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
696 
697 	*groups = atmel_pioctrl->group_names;
698 	*num_groups = atmel_pioctrl->npins;
699 
700 	return 0;
701 }
702 
703 static int atmel_pmx_set_mux(struct pinctrl_dev *pctldev,
704 			     unsigned int function,
705 			     unsigned int group)
706 {
707 	struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
708 	unsigned int pin;
709 	u32 conf;
710 
711 	dev_dbg(pctldev->dev, "enable function %s group %s\n",
712 		atmel_functions[function], atmel_pioctrl->groups[group].name);
713 
714 	pin = atmel_pioctrl->groups[group].pin;
715 	conf = atmel_pin_config_read(pctldev, pin);
716 	conf &= (~ATMEL_PIO_CFGR_FUNC_MASK);
717 	conf |= (function & ATMEL_PIO_CFGR_FUNC_MASK);
718 	dev_dbg(pctldev->dev, "pin: %u, conf: 0x%08x\n", pin, conf);
719 	atmel_pin_config_write(pctldev, pin, conf);
720 
721 	return 0;
722 }
723 
724 static const struct pinmux_ops atmel_pmxops = {
725 	.get_functions_count	= atmel_pmx_get_functions_count,
726 	.get_function_name	= atmel_pmx_get_function_name,
727 	.get_function_groups	= atmel_pmx_get_function_groups,
728 	.set_mux		= atmel_pmx_set_mux,
729 };
730 
731 static int atmel_conf_pin_config_group_get(struct pinctrl_dev *pctldev,
732 					   unsigned int group,
733 					   unsigned long *config)
734 {
735 	struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
736 	unsigned int param = pinconf_to_config_param(*config), arg = 0;
737 	struct atmel_group *grp = atmel_pioctrl->groups + group;
738 	unsigned int pin_id = grp->pin;
739 	u32 res;
740 
741 	res = atmel_pin_config_read(pctldev, pin_id);
742 
743 	switch (param) {
744 	case PIN_CONFIG_BIAS_PULL_UP:
745 		if (!(res & ATMEL_PIO_PUEN_MASK))
746 			return -EINVAL;
747 		arg = 1;
748 		break;
749 	case PIN_CONFIG_BIAS_PULL_DOWN:
750 		if ((res & ATMEL_PIO_PUEN_MASK) ||
751 		    (!(res & ATMEL_PIO_PDEN_MASK)))
752 			return -EINVAL;
753 		arg = 1;
754 		break;
755 	case PIN_CONFIG_BIAS_DISABLE:
756 		if ((res & ATMEL_PIO_PUEN_MASK) ||
757 		    ((res & ATMEL_PIO_PDEN_MASK)))
758 			return -EINVAL;
759 		arg = 1;
760 		break;
761 	case PIN_CONFIG_DRIVE_OPEN_DRAIN:
762 		if (!(res & ATMEL_PIO_OPD_MASK))
763 			return -EINVAL;
764 		arg = 1;
765 		break;
766 	case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
767 		if (!(res & ATMEL_PIO_SCHMITT_MASK))
768 			return -EINVAL;
769 		arg = 1;
770 		break;
771 	case PIN_CONFIG_SLEW_RATE:
772 		if (!atmel_pioctrl->slew_rate_support)
773 			return -EOPNOTSUPP;
774 		if (!(res & ATMEL_PIO_SR_MASK))
775 			return -EINVAL;
776 		arg = 1;
777 		break;
778 	case ATMEL_PIN_CONFIG_DRIVE_STRENGTH:
779 		if (!(res & ATMEL_PIO_DRVSTR_MASK))
780 			return -EINVAL;
781 		arg = (res & ATMEL_PIO_DRVSTR_MASK) >> ATMEL_PIO_DRVSTR_OFFSET;
782 		break;
783 	default:
784 		return -ENOTSUPP;
785 	}
786 
787 	*config = pinconf_to_config_packed(param, arg);
788 	return 0;
789 }
790 
791 static int atmel_conf_pin_config_group_set(struct pinctrl_dev *pctldev,
792 					   unsigned int group,
793 					   unsigned long *configs,
794 					   unsigned int num_configs)
795 {
796 	struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
797 	struct atmel_group *grp = atmel_pioctrl->groups + group;
798 	unsigned int bank, pin, pin_id = grp->pin;
799 	u32 mask, conf = 0;
800 	int i;
801 
802 	conf = atmel_pin_config_read(pctldev, pin_id);
803 
804 	/* Keep slew rate enabled by default. */
805 	if (atmel_pioctrl->slew_rate_support)
806 		conf |= ATMEL_PIO_SR_MASK;
807 
808 	for (i = 0; i < num_configs; i++) {
809 		unsigned int param = pinconf_to_config_param(configs[i]);
810 		unsigned int arg = pinconf_to_config_argument(configs[i]);
811 
812 		dev_dbg(pctldev->dev, "%s: pin=%u, config=0x%lx\n",
813 			__func__, pin_id, configs[i]);
814 
815 		switch (param) {
816 		case PIN_CONFIG_BIAS_DISABLE:
817 			conf &= (~ATMEL_PIO_PUEN_MASK);
818 			conf &= (~ATMEL_PIO_PDEN_MASK);
819 			break;
820 		case PIN_CONFIG_BIAS_PULL_UP:
821 			conf |= ATMEL_PIO_PUEN_MASK;
822 			conf &= (~ATMEL_PIO_PDEN_MASK);
823 			break;
824 		case PIN_CONFIG_BIAS_PULL_DOWN:
825 			conf |= ATMEL_PIO_PDEN_MASK;
826 			conf &= (~ATMEL_PIO_PUEN_MASK);
827 			break;
828 		case PIN_CONFIG_DRIVE_OPEN_DRAIN:
829 			if (arg == 0)
830 				conf &= (~ATMEL_PIO_OPD_MASK);
831 			else
832 				conf |= ATMEL_PIO_OPD_MASK;
833 			break;
834 		case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
835 			if (arg == 0)
836 				conf |= ATMEL_PIO_SCHMITT_MASK;
837 			else
838 				conf &= (~ATMEL_PIO_SCHMITT_MASK);
839 			break;
840 		case PIN_CONFIG_INPUT_DEBOUNCE:
841 			if (arg == 0) {
842 				conf &= (~ATMEL_PIO_IFEN_MASK);
843 				conf &= (~ATMEL_PIO_IFSCEN_MASK);
844 			} else {
845 				/*
846 				 * We don't care about the debounce value for several reasons:
847 				 * - can't have different debounce periods inside a same group,
848 				 * - the register to configure this period is a secure register.
849 				 * The debouncing filter can filter a pulse with a duration of less
850 				 * than 1/2 slow clock period.
851 				 */
852 				conf |= ATMEL_PIO_IFEN_MASK;
853 				conf |= ATMEL_PIO_IFSCEN_MASK;
854 			}
855 			break;
856 		case PIN_CONFIG_OUTPUT:
857 			conf |= ATMEL_PIO_DIR_MASK;
858 			bank = ATMEL_PIO_BANK(pin_id);
859 			pin = ATMEL_PIO_LINE(pin_id);
860 			mask = 1 << pin;
861 
862 			if (arg == 0) {
863 				writel_relaxed(mask, atmel_pioctrl->reg_base +
864 					bank * ATMEL_PIO_BANK_OFFSET +
865 					ATMEL_PIO_CODR);
866 			} else {
867 				writel_relaxed(mask, atmel_pioctrl->reg_base +
868 					bank * ATMEL_PIO_BANK_OFFSET +
869 					ATMEL_PIO_SODR);
870 			}
871 			break;
872 		case PIN_CONFIG_SLEW_RATE:
873 			if (!atmel_pioctrl->slew_rate_support)
874 				break;
875 			/* And remove it if explicitly requested. */
876 			if (arg == 0)
877 				conf &= ~ATMEL_PIO_SR_MASK;
878 			break;
879 		case ATMEL_PIN_CONFIG_DRIVE_STRENGTH:
880 			switch (arg) {
881 			case ATMEL_PIO_DRVSTR_LO:
882 			case ATMEL_PIO_DRVSTR_ME:
883 			case ATMEL_PIO_DRVSTR_HI:
884 				conf &= (~ATMEL_PIO_DRVSTR_MASK);
885 				conf |= arg << ATMEL_PIO_DRVSTR_OFFSET;
886 				break;
887 			default:
888 				dev_warn(pctldev->dev, "drive strength not updated (incorrect value)\n");
889 			}
890 			break;
891 		default:
892 			dev_warn(pctldev->dev,
893 				 "unsupported configuration parameter: %u\n",
894 				 param);
895 			continue;
896 		}
897 	}
898 
899 	dev_dbg(pctldev->dev, "%s: reg=0x%08x\n", __func__, conf);
900 	atmel_pin_config_write(pctldev, pin_id, conf);
901 
902 	return 0;
903 }
904 
905 static void atmel_conf_pin_config_dbg_show(struct pinctrl_dev *pctldev,
906 					   struct seq_file *s,
907 					   unsigned int pin_id)
908 {
909 	struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
910 	u32 conf;
911 
912 	if (!atmel_pioctrl->pins[pin_id]->device)
913 		return;
914 
915 	if (atmel_pioctrl->pins[pin_id])
916 		seq_printf(s, " (%s, ioset %u) ",
917 			   atmel_pioctrl->pins[pin_id]->device,
918 			   atmel_pioctrl->pins[pin_id]->ioset);
919 
920 	conf = atmel_pin_config_read(pctldev, pin_id);
921 	if (conf & ATMEL_PIO_PUEN_MASK)
922 		seq_printf(s, "%s ", "pull-up");
923 	if (conf & ATMEL_PIO_PDEN_MASK)
924 		seq_printf(s, "%s ", "pull-down");
925 	if (conf & ATMEL_PIO_IFEN_MASK)
926 		seq_printf(s, "%s ", "debounce");
927 	if (conf & ATMEL_PIO_OPD_MASK)
928 		seq_printf(s, "%s ", "open-drain");
929 	if (conf & ATMEL_PIO_SCHMITT_MASK)
930 		seq_printf(s, "%s ", "schmitt");
931 	if (atmel_pioctrl->slew_rate_support && (conf & ATMEL_PIO_SR_MASK))
932 		seq_printf(s, "%s ", "slew-rate");
933 	if (conf & ATMEL_PIO_DRVSTR_MASK) {
934 		switch ((conf & ATMEL_PIO_DRVSTR_MASK) >> ATMEL_PIO_DRVSTR_OFFSET) {
935 		case ATMEL_PIO_DRVSTR_ME:
936 			seq_printf(s, "%s ", "medium-drive");
937 			break;
938 		case ATMEL_PIO_DRVSTR_HI:
939 			seq_printf(s, "%s ", "high-drive");
940 			break;
941 		/* ATMEL_PIO_DRVSTR_LO and 0 which is the default value at reset */
942 		default:
943 			seq_printf(s, "%s ", "low-drive");
944 		}
945 	}
946 }
947 
948 static const struct pinconf_ops atmel_confops = {
949 	.pin_config_group_get	= atmel_conf_pin_config_group_get,
950 	.pin_config_group_set	= atmel_conf_pin_config_group_set,
951 	.pin_config_dbg_show	= atmel_conf_pin_config_dbg_show,
952 };
953 
954 static struct pinctrl_desc atmel_pinctrl_desc = {
955 	.name		= "atmel_pinctrl",
956 	.confops	= &atmel_confops,
957 	.pctlops	= &atmel_pctlops,
958 	.pmxops		= &atmel_pmxops,
959 };
960 
961 static int __maybe_unused atmel_pctrl_suspend(struct device *dev)
962 {
963 	struct atmel_pioctrl *atmel_pioctrl = dev_get_drvdata(dev);
964 	int i, j;
965 
966 	/*
967 	 * For each bank, save IMR to restore it later and disable all GPIO
968 	 * interrupts excepting the ones marked as wakeup sources.
969 	 */
970 	for (i = 0; i < atmel_pioctrl->nbanks; i++) {
971 		atmel_pioctrl->pm_suspend_backup[i].imr =
972 			atmel_gpio_read(atmel_pioctrl, i, ATMEL_PIO_IMR);
973 		atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_IDR,
974 				 ~atmel_pioctrl->pm_wakeup_sources[i]);
975 		atmel_pioctrl->pm_suspend_backup[i].odsr =
976 			atmel_gpio_read(atmel_pioctrl, i, ATMEL_PIO_ODSR);
977 		for (j = 0; j < ATMEL_PIO_NPINS_PER_BANK; j++) {
978 			atmel_gpio_write(atmel_pioctrl, i,
979 					 ATMEL_PIO_MSKR, BIT(j));
980 			atmel_pioctrl->pm_suspend_backup[i].cfgr[j] =
981 				atmel_gpio_read(atmel_pioctrl, i,
982 						ATMEL_PIO_CFGR);
983 		}
984 	}
985 
986 	return 0;
987 }
988 
989 static int __maybe_unused atmel_pctrl_resume(struct device *dev)
990 {
991 	struct atmel_pioctrl *atmel_pioctrl = dev_get_drvdata(dev);
992 	int i, j;
993 
994 	for (i = 0; i < atmel_pioctrl->nbanks; i++) {
995 		atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_IER,
996 				 atmel_pioctrl->pm_suspend_backup[i].imr);
997 		atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_SODR,
998 				 atmel_pioctrl->pm_suspend_backup[i].odsr);
999 		for (j = 0; j < ATMEL_PIO_NPINS_PER_BANK; j++) {
1000 			atmel_gpio_write(atmel_pioctrl, i,
1001 					 ATMEL_PIO_MSKR, BIT(j));
1002 			atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_CFGR,
1003 					 atmel_pioctrl->pm_suspend_backup[i].cfgr[j]);
1004 		}
1005 	}
1006 
1007 	return 0;
1008 }
1009 
1010 static const struct dev_pm_ops atmel_pctrl_pm_ops = {
1011 	SET_SYSTEM_SLEEP_PM_OPS(atmel_pctrl_suspend, atmel_pctrl_resume)
1012 };
1013 
1014 /*
1015  * The number of banks can be different from a SoC to another one.
1016  * We can have up to 16 banks.
1017  */
1018 static const struct atmel_pioctrl_data atmel_sama5d2_pioctrl_data = {
1019 	.nbanks			= 4,
1020 	.last_bank_count	= ATMEL_PIO_NPINS_PER_BANK,
1021 };
1022 
1023 static const struct atmel_pioctrl_data microchip_sama7g5_pioctrl_data = {
1024 	.nbanks			= 5,
1025 	.last_bank_count	= 8, /* sama7g5 has only PE0 to PE7 */
1026 	.slew_rate_support	= 1,
1027 };
1028 
1029 static const struct of_device_id atmel_pctrl_of_match[] = {
1030 	{
1031 		.compatible = "atmel,sama5d2-pinctrl",
1032 		.data = &atmel_sama5d2_pioctrl_data,
1033 	}, {
1034 		.compatible = "microchip,sama7g5-pinctrl",
1035 		.data = &microchip_sama7g5_pioctrl_data,
1036 	}, {
1037 		/* sentinel */
1038 	}
1039 };
1040 
1041 static int atmel_pinctrl_probe(struct platform_device *pdev)
1042 {
1043 	struct device *dev = &pdev->dev;
1044 	struct pinctrl_pin_desc	*pin_desc;
1045 	const char **group_names;
1046 	const struct of_device_id *match;
1047 	int i, ret;
1048 	struct atmel_pioctrl *atmel_pioctrl;
1049 	const struct atmel_pioctrl_data *atmel_pioctrl_data;
1050 
1051 	atmel_pioctrl = devm_kzalloc(dev, sizeof(*atmel_pioctrl), GFP_KERNEL);
1052 	if (!atmel_pioctrl)
1053 		return -ENOMEM;
1054 	atmel_pioctrl->dev = dev;
1055 	atmel_pioctrl->node = dev->of_node;
1056 	platform_set_drvdata(pdev, atmel_pioctrl);
1057 
1058 	match = of_match_node(atmel_pctrl_of_match, dev->of_node);
1059 	if (!match) {
1060 		dev_err(dev, "unknown compatible string\n");
1061 		return -ENODEV;
1062 	}
1063 	atmel_pioctrl_data = match->data;
1064 	atmel_pioctrl->nbanks = atmel_pioctrl_data->nbanks;
1065 	atmel_pioctrl->npins = atmel_pioctrl->nbanks * ATMEL_PIO_NPINS_PER_BANK;
1066 	/* if last bank has limited number of pins, adjust accordingly */
1067 	if (atmel_pioctrl_data->last_bank_count != ATMEL_PIO_NPINS_PER_BANK) {
1068 		atmel_pioctrl->npins -= ATMEL_PIO_NPINS_PER_BANK;
1069 		atmel_pioctrl->npins += atmel_pioctrl_data->last_bank_count;
1070 	}
1071 	atmel_pioctrl->slew_rate_support = atmel_pioctrl_data->slew_rate_support;
1072 
1073 	atmel_pioctrl->reg_base = devm_platform_ioremap_resource(pdev, 0);
1074 	if (IS_ERR(atmel_pioctrl->reg_base))
1075 		return PTR_ERR(atmel_pioctrl->reg_base);
1076 
1077 	atmel_pioctrl->clk = devm_clk_get(dev, NULL);
1078 	if (IS_ERR(atmel_pioctrl->clk)) {
1079 		dev_err(dev, "failed to get clock\n");
1080 		return PTR_ERR(atmel_pioctrl->clk);
1081 	}
1082 
1083 	atmel_pioctrl->pins = devm_kcalloc(dev,
1084 					   atmel_pioctrl->npins,
1085 					   sizeof(*atmel_pioctrl->pins),
1086 					   GFP_KERNEL);
1087 	if (!atmel_pioctrl->pins)
1088 		return -ENOMEM;
1089 
1090 	pin_desc = devm_kcalloc(dev, atmel_pioctrl->npins, sizeof(*pin_desc),
1091 				GFP_KERNEL);
1092 	if (!pin_desc)
1093 		return -ENOMEM;
1094 	atmel_pinctrl_desc.pins = pin_desc;
1095 	atmel_pinctrl_desc.npins = atmel_pioctrl->npins;
1096 	atmel_pinctrl_desc.num_custom_params = ARRAY_SIZE(atmel_custom_bindings);
1097 	atmel_pinctrl_desc.custom_params = atmel_custom_bindings;
1098 
1099 	/* One pin is one group since a pin can achieve all functions. */
1100 	group_names = devm_kcalloc(dev,
1101 				   atmel_pioctrl->npins, sizeof(*group_names),
1102 				   GFP_KERNEL);
1103 	if (!group_names)
1104 		return -ENOMEM;
1105 	atmel_pioctrl->group_names = group_names;
1106 
1107 	atmel_pioctrl->groups = devm_kcalloc(&pdev->dev,
1108 			atmel_pioctrl->npins, sizeof(*atmel_pioctrl->groups),
1109 			GFP_KERNEL);
1110 	if (!atmel_pioctrl->groups)
1111 		return -ENOMEM;
1112 	for (i = 0 ; i < atmel_pioctrl->npins; i++) {
1113 		struct atmel_group *group = atmel_pioctrl->groups + i;
1114 		unsigned int bank = ATMEL_PIO_BANK(i);
1115 		unsigned int line = ATMEL_PIO_LINE(i);
1116 
1117 		atmel_pioctrl->pins[i] = devm_kzalloc(dev,
1118 				sizeof(**atmel_pioctrl->pins), GFP_KERNEL);
1119 		if (!atmel_pioctrl->pins[i])
1120 			return -ENOMEM;
1121 
1122 		atmel_pioctrl->pins[i]->pin_id = i;
1123 		atmel_pioctrl->pins[i]->bank = bank;
1124 		atmel_pioctrl->pins[i]->line = line;
1125 
1126 		pin_desc[i].number = i;
1127 		/* Pin naming convention: P(bank_name)(bank_pin_number). */
1128 		pin_desc[i].name = kasprintf(GFP_KERNEL, "P%c%d",
1129 					     bank + 'A', line);
1130 
1131 		group->name = group_names[i] = pin_desc[i].name;
1132 		group->pin = pin_desc[i].number;
1133 
1134 		dev_dbg(dev, "pin_id=%u, bank=%u, line=%u", i, bank, line);
1135 	}
1136 
1137 	atmel_pioctrl->gpio_chip = &atmel_gpio_chip;
1138 	atmel_pioctrl->gpio_chip->ngpio = atmel_pioctrl->npins;
1139 	atmel_pioctrl->gpio_chip->label = dev_name(dev);
1140 	atmel_pioctrl->gpio_chip->parent = dev;
1141 	atmel_pioctrl->gpio_chip->names = atmel_pioctrl->group_names;
1142 
1143 	atmel_pioctrl->pm_wakeup_sources = devm_kcalloc(dev,
1144 			atmel_pioctrl->nbanks,
1145 			sizeof(*atmel_pioctrl->pm_wakeup_sources),
1146 			GFP_KERNEL);
1147 	if (!atmel_pioctrl->pm_wakeup_sources)
1148 		return -ENOMEM;
1149 
1150 	atmel_pioctrl->pm_suspend_backup = devm_kcalloc(dev,
1151 			atmel_pioctrl->nbanks,
1152 			sizeof(*atmel_pioctrl->pm_suspend_backup),
1153 			GFP_KERNEL);
1154 	if (!atmel_pioctrl->pm_suspend_backup)
1155 		return -ENOMEM;
1156 
1157 	atmel_pioctrl->irqs = devm_kcalloc(dev,
1158 					   atmel_pioctrl->nbanks,
1159 					   sizeof(*atmel_pioctrl->irqs),
1160 					   GFP_KERNEL);
1161 	if (!atmel_pioctrl->irqs)
1162 		return -ENOMEM;
1163 
1164 	/* There is one controller but each bank has its own irq line. */
1165 	for (i = 0; i < atmel_pioctrl->nbanks; i++) {
1166 		ret = platform_get_irq(pdev, i);
1167 		if (ret < 0) {
1168 			dev_dbg(dev, "missing irq resource for group %c\n",
1169 				'A' + i);
1170 			return ret;
1171 		}
1172 		atmel_pioctrl->irqs[i] = ret;
1173 		irq_set_chained_handler_and_data(ret, atmel_gpio_irq_handler, atmel_pioctrl);
1174 		dev_dbg(dev, "bank %i: irq=%d\n", i, ret);
1175 	}
1176 
1177 	atmel_pioctrl->irq_domain = irq_domain_add_linear(dev->of_node,
1178 			atmel_pioctrl->gpio_chip->ngpio,
1179 			&irq_domain_simple_ops, NULL);
1180 	if (!atmel_pioctrl->irq_domain) {
1181 		dev_err(dev, "can't add the irq domain\n");
1182 		return -ENODEV;
1183 	}
1184 	atmel_pioctrl->irq_domain->name = "atmel gpio";
1185 
1186 	for (i = 0; i < atmel_pioctrl->npins; i++) {
1187 		int irq = irq_create_mapping(atmel_pioctrl->irq_domain, i);
1188 
1189 		irq_set_chip_and_handler(irq, &atmel_gpio_irq_chip,
1190 					 handle_simple_irq);
1191 		irq_set_chip_data(irq, atmel_pioctrl);
1192 		dev_dbg(dev,
1193 			"atmel gpio irq domain: hwirq: %d, linux irq: %d\n",
1194 			i, irq);
1195 	}
1196 
1197 	ret = clk_prepare_enable(atmel_pioctrl->clk);
1198 	if (ret) {
1199 		dev_err(dev, "failed to prepare and enable clock\n");
1200 		goto clk_prepare_enable_error;
1201 	}
1202 
1203 	atmel_pioctrl->pinctrl_dev = devm_pinctrl_register(&pdev->dev,
1204 							   &atmel_pinctrl_desc,
1205 							   atmel_pioctrl);
1206 	if (IS_ERR(atmel_pioctrl->pinctrl_dev)) {
1207 		ret = PTR_ERR(atmel_pioctrl->pinctrl_dev);
1208 		dev_err(dev, "pinctrl registration failed\n");
1209 		goto clk_unprep;
1210 	}
1211 
1212 	ret = gpiochip_add_data(atmel_pioctrl->gpio_chip, atmel_pioctrl);
1213 	if (ret) {
1214 		dev_err(dev, "failed to add gpiochip\n");
1215 		goto clk_unprep;
1216 	}
1217 
1218 	ret = gpiochip_add_pin_range(atmel_pioctrl->gpio_chip, dev_name(dev),
1219 				     0, 0, atmel_pioctrl->gpio_chip->ngpio);
1220 	if (ret) {
1221 		dev_err(dev, "failed to add gpio pin range\n");
1222 		goto gpiochip_add_pin_range_error;
1223 	}
1224 
1225 	dev_info(&pdev->dev, "atmel pinctrl initialized\n");
1226 
1227 	return 0;
1228 
1229 gpiochip_add_pin_range_error:
1230 	gpiochip_remove(atmel_pioctrl->gpio_chip);
1231 
1232 clk_unprep:
1233 	clk_disable_unprepare(atmel_pioctrl->clk);
1234 
1235 clk_prepare_enable_error:
1236 	irq_domain_remove(atmel_pioctrl->irq_domain);
1237 
1238 	return ret;
1239 }
1240 
1241 static struct platform_driver atmel_pinctrl_driver = {
1242 	.driver = {
1243 		.name = "pinctrl-at91-pio4",
1244 		.of_match_table = atmel_pctrl_of_match,
1245 		.pm = &atmel_pctrl_pm_ops,
1246 		.suppress_bind_attrs = true,
1247 	},
1248 	.probe = atmel_pinctrl_probe,
1249 };
1250 builtin_platform_driver(atmel_pinctrl_driver);
1251