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uapi/if_ether.h: move __UAPI_DEF_ETHHDR libc define
[linux/fpc-iii.git] / drivers / gpio / gpio-mvebu.c
blobbe85d4b39e99746d04575d31f92e34643269b594
1 /*
2 * GPIO driver for Marvell SoCs
3 *
4 * Copyright (C) 2012 Marvell
5 *
6 * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
7 * Andrew Lunn <andrew@lunn.ch>
8 * Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
9 *
10 * This file is licensed under the terms of the GNU General Public
11 * License version 2. This program is licensed "as is" without any
12 * warranty of any kind, whether express or implied.
13 *
14 * This driver is a fairly straightforward GPIO driver for the
15 * complete family of Marvell EBU SoC platforms (Orion, Dove,
16 * Kirkwood, Discovery, Armada 370/XP). The only complexity of this
17 * driver is the different register layout that exists between the
18 * non-SMP platforms (Orion, Dove, Kirkwood, Armada 370) and the SMP
19 * platforms (MV78200 from the Discovery family and the Armada
20 * XP). Therefore, this driver handles three variants of the GPIO
21 * block:
22 * - the basic variant, called "orion-gpio", with the simplest
23 * register set. Used on Orion, Dove, Kirkwoord, Armada 370 and
24 * non-SMP Discovery systems
25 * - the mv78200 variant for MV78200 Discovery systems. This variant
26 * turns the edge mask and level mask registers into CPU0 edge
27 * mask/level mask registers, and adds CPU1 edge mask/level mask
28 * registers.
29 * - the armadaxp variant for Armada XP systems. This variant keeps
30 * the normal cause/edge mask/level mask registers when the global
31 * interrupts are used, but adds per-CPU cause/edge mask/level mask
32 * registers n a separate memory area for the per-CPU GPIO
33 * interrupts.
34 */
35
36 #include <linux/bitops.h>
37 #include <linux/clk.h>
38 #include <linux/err.h>
39 #include <linux/gpio.h>
40 #include <linux/init.h>
41 #include <linux/io.h>
42 #include <linux/irq.h>
43 #include <linux/irqchip/chained_irq.h>
44 #include <linux/irqdomain.h>
45 #include <linux/mfd/syscon.h>
46 #include <linux/of_device.h>
47 #include <linux/of_irq.h>
48 #include <linux/pinctrl/consumer.h>
49 #include <linux/platform_device.h>
50 #include <linux/pwm.h>
51 #include <linux/regmap.h>
52 #include <linux/slab.h>
53
54 #include "gpiolib.h"
55
56 /*
57 * GPIO unit register offsets.
58 */
59 #define GPIO_OUT_OFF 0x0000
60 #define GPIO_IO_CONF_OFF 0x0004
61 #define GPIO_BLINK_EN_OFF 0x0008
62 #define GPIO_IN_POL_OFF 0x000c
63 #define GPIO_DATA_IN_OFF 0x0010
64 #define GPIO_EDGE_CAUSE_OFF 0x0014
65 #define GPIO_EDGE_MASK_OFF 0x0018
66 #define GPIO_LEVEL_MASK_OFF 0x001c
67 #define GPIO_BLINK_CNT_SELECT_OFF 0x0020
68
69 /*
70 * PWM register offsets.
71 */
72 #define PWM_BLINK_ON_DURATION_OFF 0x0
73 #define PWM_BLINK_OFF_DURATION_OFF 0x4
74
75
76 /* The MV78200 has per-CPU registers for edge mask and level mask */
77 #define GPIO_EDGE_MASK_MV78200_OFF(cpu) ((cpu) ? 0x30 : 0x18)
78 #define GPIO_LEVEL_MASK_MV78200_OFF(cpu) ((cpu) ? 0x34 : 0x1C)
79
80 /*
81 * The Armada XP has per-CPU registers for interrupt cause, interrupt
82 * mask and interrupt level mask. Those are relative to the
83 * percpu_membase.
84 */
85 #define GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu) ((cpu) * 0x4)
86 #define GPIO_EDGE_MASK_ARMADAXP_OFF(cpu) (0x10 + (cpu) * 0x4)
87 #define GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu) (0x20 + (cpu) * 0x4)
88
89 #define MVEBU_GPIO_SOC_VARIANT_ORION 0x1
90 #define MVEBU_GPIO_SOC_VARIANT_MV78200 0x2
91 #define MVEBU_GPIO_SOC_VARIANT_ARMADAXP 0x3
92 #define MVEBU_GPIO_SOC_VARIANT_A8K 0x4
93
94 #define MVEBU_MAX_GPIO_PER_BANK 32
95
96 struct mvebu_pwm {
97 void __iomem *membase;
98 unsigned long clk_rate;
99 struct gpio_desc *gpiod;
100 struct pwm_chip chip;
101 spinlock_t lock;
102 struct mvebu_gpio_chip *mvchip;
103
104 /* Used to preserve GPIO/PWM registers across suspend/resume */
105 u32 blink_select;
106 u32 blink_on_duration;
107 u32 blink_off_duration;
108 };
109
110 struct mvebu_gpio_chip {
111 struct gpio_chip chip;
112 struct regmap *regs;
113 u32 offset;
114 struct regmap *percpu_regs;
115 int irqbase;
116 struct irq_domain *domain;
117 int soc_variant;
118
119 /* Used for PWM support */
120 struct clk *clk;
121 struct mvebu_pwm *mvpwm;
122
123 /* Used to preserve GPIO registers across suspend/resume */
124 u32 out_reg;
125 u32 io_conf_reg;
126 u32 blink_en_reg;
127 u32 in_pol_reg;
128 u32 edge_mask_regs[4];
129 u32 level_mask_regs[4];
130 };
131
132 /*
133 * Functions returning addresses of individual registers for a given
134 * GPIO controller.
135 */
136
137 static void mvebu_gpioreg_edge_cause(struct mvebu_gpio_chip *mvchip,
138 struct regmap **map, unsigned int *offset)
139 {
140 int cpu;
141
142 switch (mvchip->soc_variant) {
143 case MVEBU_GPIO_SOC_VARIANT_ORION:
144 case MVEBU_GPIO_SOC_VARIANT_MV78200:
145 case MVEBU_GPIO_SOC_VARIANT_A8K:
146 *map = mvchip->regs;
147 *offset = GPIO_EDGE_CAUSE_OFF + mvchip->offset;
148 break;
149 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
150 cpu = smp_processor_id();
151 *map = mvchip->percpu_regs;
152 *offset = GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu);
153 break;
154 default:
155 BUG();
156 }
157 }
158
159 static u32
160 mvebu_gpio_read_edge_cause(struct mvebu_gpio_chip *mvchip)
161 {
162 struct regmap *map;
163 unsigned int offset;
164 u32 val;
165
166 mvebu_gpioreg_edge_cause(mvchip, &map, &offset);
167 regmap_read(map, offset, &val);
168
169 return val;
170 }
171
172 static void
173 mvebu_gpio_write_edge_cause(struct mvebu_gpio_chip *mvchip, u32 val)
174 {
175 struct regmap *map;
176 unsigned int offset;
177
178 mvebu_gpioreg_edge_cause(mvchip, &map, &offset);
179 regmap_write(map, offset, val);
180 }
181
182 static inline void
183 mvebu_gpioreg_edge_mask(struct mvebu_gpio_chip *mvchip,
184 struct regmap **map, unsigned int *offset)
185 {
186 int cpu;
187
188 switch (mvchip->soc_variant) {
189 case MVEBU_GPIO_SOC_VARIANT_ORION:
190 case MVEBU_GPIO_SOC_VARIANT_A8K:
191 *map = mvchip->regs;
192 *offset = GPIO_EDGE_MASK_OFF + mvchip->offset;
193 break;
194 case MVEBU_GPIO_SOC_VARIANT_MV78200:
195 cpu = smp_processor_id();
196 *map = mvchip->regs;
197 *offset = GPIO_EDGE_MASK_MV78200_OFF(cpu);
198 break;
199 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
200 cpu = smp_processor_id();
201 *map = mvchip->percpu_regs;
202 *offset = GPIO_EDGE_MASK_ARMADAXP_OFF(cpu);
203 break;
204 default:
205 BUG();
206 }
207 }
208
209 static u32
210 mvebu_gpio_read_edge_mask(struct mvebu_gpio_chip *mvchip)
211 {
212 struct regmap *map;
213 unsigned int offset;
214 u32 val;
215
216 mvebu_gpioreg_edge_mask(mvchip, &map, &offset);
217 regmap_read(map, offset, &val);
218
219 return val;
220 }
221
222 static void
223 mvebu_gpio_write_edge_mask(struct mvebu_gpio_chip *mvchip, u32 val)
224 {
225 struct regmap *map;
226 unsigned int offset;
227
228 mvebu_gpioreg_edge_mask(mvchip, &map, &offset);
229 regmap_write(map, offset, val);
230 }
231
232 static void
233 mvebu_gpioreg_level_mask(struct mvebu_gpio_chip *mvchip,
234 struct regmap **map, unsigned int *offset)
235 {
236 int cpu;
237
238 switch (mvchip->soc_variant) {
239 case MVEBU_GPIO_SOC_VARIANT_ORION:
240 case MVEBU_GPIO_SOC_VARIANT_A8K:
241 *map = mvchip->regs;
242 *offset = GPIO_LEVEL_MASK_OFF + mvchip->offset;
243 break;
244 case MVEBU_GPIO_SOC_VARIANT_MV78200:
245 cpu = smp_processor_id();
246 *map = mvchip->regs;
247 *offset = GPIO_LEVEL_MASK_MV78200_OFF(cpu);
248 break;
249 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
250 cpu = smp_processor_id();
251 *map = mvchip->percpu_regs;
252 *offset = GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu);
253 break;
254 default:
255 BUG();
256 }
257 }
258
259 static u32
260 mvebu_gpio_read_level_mask(struct mvebu_gpio_chip *mvchip)
261 {
262 struct regmap *map;
263 unsigned int offset;
264 u32 val;
265
266 mvebu_gpioreg_level_mask(mvchip, &map, &offset);
267 regmap_read(map, offset, &val);
268
269 return val;
270 }
271
272 static void
273 mvebu_gpio_write_level_mask(struct mvebu_gpio_chip *mvchip, u32 val)
274 {
275 struct regmap *map;
276 unsigned int offset;
277
278 mvebu_gpioreg_level_mask(mvchip, &map, &offset);
279 regmap_write(map, offset, val);
280 }
281
282 /*
283 * Functions returning addresses of individual registers for a given
284 * PWM controller.
285 */
286 static void __iomem *mvebu_pwmreg_blink_on_duration(struct mvebu_pwm *mvpwm)
287 {
288 return mvpwm->membase + PWM_BLINK_ON_DURATION_OFF;
289 }
290
291 static void __iomem *mvebu_pwmreg_blink_off_duration(struct mvebu_pwm *mvpwm)
292 {
293 return mvpwm->membase + PWM_BLINK_OFF_DURATION_OFF;
294 }
295
296 /*
297 * Functions implementing the gpio_chip methods
298 */
299 static void mvebu_gpio_set(struct gpio_chip *chip, unsigned int pin, int value)
300 {
301 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
302
303 regmap_update_bits(mvchip->regs, GPIO_OUT_OFF + mvchip->offset,
304 BIT(pin), value ? BIT(pin) : 0);
305 }
306
307 static int mvebu_gpio_get(struct gpio_chip *chip, unsigned int pin)
308 {
309 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
310 u32 u;
311
312 regmap_read(mvchip->regs, GPIO_IO_CONF_OFF + mvchip->offset, &u);
313
314 if (u & BIT(pin)) {
315 u32 data_in, in_pol;
316
317 regmap_read(mvchip->regs, GPIO_DATA_IN_OFF + mvchip->offset,
318 &data_in);
319 regmap_read(mvchip->regs, GPIO_IN_POL_OFF + mvchip->offset,
320 &in_pol);
321 u = data_in ^ in_pol;
322 } else {
323 regmap_read(mvchip->regs, GPIO_OUT_OFF + mvchip->offset, &u);
324 }
325
326 return (u >> pin) & 1;
327 }
328
329 static void mvebu_gpio_blink(struct gpio_chip *chip, unsigned int pin,
330 int value)
331 {
332 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
333
334 regmap_update_bits(mvchip->regs, GPIO_BLINK_EN_OFF + mvchip->offset,
335 BIT(pin), value ? BIT(pin) : 0);
336 }
337
338 static int mvebu_gpio_direction_input(struct gpio_chip *chip, unsigned int pin)
339 {
340 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
341 int ret;
342
343 /*
344 * Check with the pinctrl driver whether this pin is usable as
345 * an input GPIO
346 */
347 ret = pinctrl_gpio_direction_input(chip->base + pin);
348 if (ret)
349 return ret;
350
351 regmap_update_bits(mvchip->regs, GPIO_IO_CONF_OFF + mvchip->offset,
352 BIT(pin), BIT(pin));
353
354 return 0;
355 }
356
357 static int mvebu_gpio_direction_output(struct gpio_chip *chip, unsigned int pin,
358 int value)
359 {
360 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
361 int ret;
362
363 /*
364 * Check with the pinctrl driver whether this pin is usable as
365 * an output GPIO
366 */
367 ret = pinctrl_gpio_direction_output(chip->base + pin);
368 if (ret)
369 return ret;
370
371 mvebu_gpio_blink(chip, pin, 0);
372 mvebu_gpio_set(chip, pin, value);
373
374 regmap_update_bits(mvchip->regs, GPIO_IO_CONF_OFF + mvchip->offset,
375 BIT(pin), 0);
376
377 return 0;
378 }
379
380 static int mvebu_gpio_to_irq(struct gpio_chip *chip, unsigned int pin)
381 {
382 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
383
384 return irq_create_mapping(mvchip->domain, pin);
385 }
386
387 /*
388 * Functions implementing the irq_chip methods
389 */
390 static void mvebu_gpio_irq_ack(struct irq_data *d)
391 {
392 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
393 struct mvebu_gpio_chip *mvchip = gc->private;
394 u32 mask = d->mask;
395
396 irq_gc_lock(gc);
397 mvebu_gpio_write_edge_cause(mvchip, ~mask);
398 irq_gc_unlock(gc);
399 }
400
401 static void mvebu_gpio_edge_irq_mask(struct irq_data *d)
402 {
403 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
404 struct mvebu_gpio_chip *mvchip = gc->private;
405 struct irq_chip_type *ct = irq_data_get_chip_type(d);
406 u32 mask = d->mask;
407
408 irq_gc_lock(gc);
409 ct->mask_cache_priv &= ~mask;
410 mvebu_gpio_write_edge_mask(mvchip, ct->mask_cache_priv);
411 irq_gc_unlock(gc);
412 }
413
414 static void mvebu_gpio_edge_irq_unmask(struct irq_data *d)
415 {
416 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
417 struct mvebu_gpio_chip *mvchip = gc->private;
418 struct irq_chip_type *ct = irq_data_get_chip_type(d);
419 u32 mask = d->mask;
420
421 irq_gc_lock(gc);
422 ct->mask_cache_priv |= mask;
423 mvebu_gpio_write_edge_mask(mvchip, ct->mask_cache_priv);
424 irq_gc_unlock(gc);
425 }
426
427 static void mvebu_gpio_level_irq_mask(struct irq_data *d)
428 {
429 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
430 struct mvebu_gpio_chip *mvchip = gc->private;
431 struct irq_chip_type *ct = irq_data_get_chip_type(d);
432 u32 mask = d->mask;
433
434 irq_gc_lock(gc);
435 ct->mask_cache_priv &= ~mask;
436 mvebu_gpio_write_level_mask(mvchip, ct->mask_cache_priv);
437 irq_gc_unlock(gc);
438 }
439
440 static void mvebu_gpio_level_irq_unmask(struct irq_data *d)
441 {
442 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
443 struct mvebu_gpio_chip *mvchip = gc->private;
444 struct irq_chip_type *ct = irq_data_get_chip_type(d);
445 u32 mask = d->mask;
446
447 irq_gc_lock(gc);
448 ct->mask_cache_priv |= mask;
449 mvebu_gpio_write_level_mask(mvchip, ct->mask_cache_priv);
450 irq_gc_unlock(gc);
451 }
452
453 /*****************************************************************************
454 * MVEBU GPIO IRQ
455 *
456 * GPIO_IN_POL register controls whether GPIO_DATA_IN will hold the same
457 * value of the line or the opposite value.
458 *
459 * Level IRQ handlers: DATA_IN is used directly as cause register.
460 * Interrupt are masked by LEVEL_MASK registers.
461 * Edge IRQ handlers: Change in DATA_IN are latched in EDGE_CAUSE.
462 * Interrupt are masked by EDGE_MASK registers.
463 * Both-edge handlers: Similar to regular Edge handlers, but also swaps
464 * the polarity to catch the next line transaction.
465 * This is a race condition that might not perfectly
466 * work on some use cases.
467 *
468 * Every eight GPIO lines are grouped (OR'ed) before going up to main
469 * cause register.
470 *
471 * EDGE cause mask
472 * data-in /--------| |-----| |----\
473 * -----| |----- ---- to main cause reg
474 * X \----------------| |----/
475 * polarity LEVEL mask
476 *
477 ****************************************************************************/
478
479 static int mvebu_gpio_irq_set_type(struct irq_data *d, unsigned int type)
480 {
481 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
482 struct irq_chip_type *ct = irq_data_get_chip_type(d);
483 struct mvebu_gpio_chip *mvchip = gc->private;
484 int pin;
485 u32 u;
486
487 pin = d->hwirq;
488
489 regmap_read(mvchip->regs, GPIO_IO_CONF_OFF + mvchip->offset, &u);
490 if ((u & BIT(pin)) == 0)
491 return -EINVAL;
492
493 type &= IRQ_TYPE_SENSE_MASK;
494 if (type == IRQ_TYPE_NONE)
495 return -EINVAL;
496
497 /* Check if we need to change chip and handler */
498 if (!(ct->type & type))
499 if (irq_setup_alt_chip(d, type))
500 return -EINVAL;
501
502 /*
503 * Configure interrupt polarity.
504 */
505 switch (type) {
506 case IRQ_TYPE_EDGE_RISING:
507 case IRQ_TYPE_LEVEL_HIGH:
508 regmap_update_bits(mvchip->regs,
509 GPIO_IN_POL_OFF + mvchip->offset,
510 BIT(pin), 0);
511 break;
512 case IRQ_TYPE_EDGE_FALLING:
513 case IRQ_TYPE_LEVEL_LOW:
514 regmap_update_bits(mvchip->regs,
515 GPIO_IN_POL_OFF + mvchip->offset,
516 BIT(pin), BIT(pin));
517 break;
518 case IRQ_TYPE_EDGE_BOTH: {
519 u32 data_in, in_pol, val;
520
521 regmap_read(mvchip->regs,
522 GPIO_IN_POL_OFF + mvchip->offset, &in_pol);
523 regmap_read(mvchip->regs,
524 GPIO_DATA_IN_OFF + mvchip->offset, &data_in);
525
526 /*
527 * set initial polarity based on current input level
528 */
529 if ((data_in ^ in_pol) & BIT(pin))
530 val = BIT(pin); /* falling */
531 else
532 val = 0; /* raising */
533
534 regmap_update_bits(mvchip->regs,
535 GPIO_IN_POL_OFF + mvchip->offset,
536 BIT(pin), val);
537 break;
538 }
539 }
540 return 0;
541 }
542
543 static void mvebu_gpio_irq_handler(struct irq_desc *desc)
544 {
545 struct mvebu_gpio_chip *mvchip = irq_desc_get_handler_data(desc);
546 struct irq_chip *chip = irq_desc_get_chip(desc);
547 u32 cause, type, data_in, level_mask, edge_cause, edge_mask;
548 int i;
549
550 if (mvchip == NULL)
551 return;
552
553 chained_irq_enter(chip, desc);
554
555 regmap_read(mvchip->regs, GPIO_DATA_IN_OFF + mvchip->offset, &data_in);
556 level_mask = mvebu_gpio_read_level_mask(mvchip);
557 edge_cause = mvebu_gpio_read_edge_cause(mvchip);
558 edge_mask = mvebu_gpio_read_edge_mask(mvchip);
559
560 cause = (data_in & level_mask) | (edge_cause & edge_mask);
561
562 for (i = 0; i < mvchip->chip.ngpio; i++) {
563 int irq;
564
565 irq = irq_find_mapping(mvchip->domain, i);
566
567 if (!(cause & BIT(i)))
568 continue;
569
570 type = irq_get_trigger_type(irq);
571 if ((type & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH) {
572 /* Swap polarity (race with GPIO line) */
573 u32 polarity;
574
575 regmap_read(mvchip->regs,
576 GPIO_IN_POL_OFF + mvchip->offset,
577 &polarity);
578 polarity ^= BIT(i);
579 regmap_write(mvchip->regs,
580 GPIO_IN_POL_OFF + mvchip->offset,
581 polarity);
582 }
583
584 generic_handle_irq(irq);
585 }
586
587 chained_irq_exit(chip, desc);
588 }
589
590 /*
591 * Functions implementing the pwm_chip methods
592 */
593 static struct mvebu_pwm *to_mvebu_pwm(struct pwm_chip *chip)
594 {
595 return container_of(chip, struct mvebu_pwm, chip);
596 }
597
598 static int mvebu_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
599 {
600 struct mvebu_pwm *mvpwm = to_mvebu_pwm(chip);
601 struct mvebu_gpio_chip *mvchip = mvpwm->mvchip;
602 struct gpio_desc *desc;
603 unsigned long flags;
604 int ret = 0;
605
606 spin_lock_irqsave(&mvpwm->lock, flags);
607
608 if (mvpwm->gpiod) {
609 ret = -EBUSY;
610 } else {
611 desc = gpio_to_desc(mvchip->chip.base + pwm->hwpwm);
612 if (!desc) {
613 ret = -ENODEV;
614 goto out;
615 }
616
617 ret = gpiod_request(desc, "mvebu-pwm");
618 if (ret)
619 goto out;
620
621 ret = gpiod_direction_output(desc, 0);
622 if (ret) {
623 gpiod_free(desc);
624 goto out;
625 }
626
627 mvpwm->gpiod = desc;
628 }
629 out:
630 spin_unlock_irqrestore(&mvpwm->lock, flags);
631 return ret;
632 }
633
634 static void mvebu_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
635 {
636 struct mvebu_pwm *mvpwm = to_mvebu_pwm(chip);
637 unsigned long flags;
638
639 spin_lock_irqsave(&mvpwm->lock, flags);
640 gpiod_free(mvpwm->gpiod);
641 mvpwm->gpiod = NULL;
642 spin_unlock_irqrestore(&mvpwm->lock, flags);
643 }
644
645 static void mvebu_pwm_get_state(struct pwm_chip *chip,
646 struct pwm_device *pwm,
647 struct pwm_state *state) {
648
649 struct mvebu_pwm *mvpwm = to_mvebu_pwm(chip);
650 struct mvebu_gpio_chip *mvchip = mvpwm->mvchip;
651 unsigned long long val;
652 unsigned long flags;
653 u32 u;
654
655 spin_lock_irqsave(&mvpwm->lock, flags);
656
657 val = (unsigned long long)
658 readl_relaxed(mvebu_pwmreg_blink_on_duration(mvpwm));
659 val *= NSEC_PER_SEC;
660 do_div(val, mvpwm->clk_rate);
661 if (val > UINT_MAX)
662 state->duty_cycle = UINT_MAX;
663 else if (val)
664 state->duty_cycle = val;
665 else
666 state->duty_cycle = 1;
667
668 val = (unsigned long long)
669 readl_relaxed(mvebu_pwmreg_blink_off_duration(mvpwm));
670 val *= NSEC_PER_SEC;
671 do_div(val, mvpwm->clk_rate);
672 if (val < state->duty_cycle) {
673 state->period = 1;
674 } else {
675 val -= state->duty_cycle;
676 if (val > UINT_MAX)
677 state->period = UINT_MAX;
678 else if (val)
679 state->period = val;
680 else
681 state->period = 1;
682 }
683
684 regmap_read(mvchip->regs, GPIO_BLINK_EN_OFF + mvchip->offset, &u);
685 if (u)
686 state->enabled = true;
687 else
688 state->enabled = false;
689
690 spin_unlock_irqrestore(&mvpwm->lock, flags);
691 }
692
693 static int mvebu_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
694 struct pwm_state *state)
695 {
696 struct mvebu_pwm *mvpwm = to_mvebu_pwm(chip);
697 struct mvebu_gpio_chip *mvchip = mvpwm->mvchip;
698 unsigned long long val;
699 unsigned long flags;
700 unsigned int on, off;
701
702 val = (unsigned long long) mvpwm->clk_rate * state->duty_cycle;
703 do_div(val, NSEC_PER_SEC);
704 if (val > UINT_MAX)
705 return -EINVAL;
706 if (val)
707 on = val;
708 else
709 on = 1;
710
711 val = (unsigned long long) mvpwm->clk_rate *
712 (state->period - state->duty_cycle);
713 do_div(val, NSEC_PER_SEC);
714 if (val > UINT_MAX)
715 return -EINVAL;
716 if (val)
717 off = val;
718 else
719 off = 1;
720
721 spin_lock_irqsave(&mvpwm->lock, flags);
722
723 writel_relaxed(on, mvebu_pwmreg_blink_on_duration(mvpwm));
724 writel_relaxed(off, mvebu_pwmreg_blink_off_duration(mvpwm));
725 if (state->enabled)
726 mvebu_gpio_blink(&mvchip->chip, pwm->hwpwm, 1);
727 else
728 mvebu_gpio_blink(&mvchip->chip, pwm->hwpwm, 0);
729
730 spin_unlock_irqrestore(&mvpwm->lock, flags);
731
732 return 0;
733 }
734
735 static const struct pwm_ops mvebu_pwm_ops = {
736 .request = mvebu_pwm_request,
737 .free = mvebu_pwm_free,
738 .get_state = mvebu_pwm_get_state,
739 .apply = mvebu_pwm_apply,
740 .owner = THIS_MODULE,
741 };
742
743 static void __maybe_unused mvebu_pwm_suspend(struct mvebu_gpio_chip *mvchip)
744 {
745 struct mvebu_pwm *mvpwm = mvchip->mvpwm;
746
747 regmap_read(mvchip->regs, GPIO_BLINK_CNT_SELECT_OFF + mvchip->offset,
748 &mvpwm->blink_select);
749 mvpwm->blink_on_duration =
750 readl_relaxed(mvebu_pwmreg_blink_on_duration(mvpwm));
751 mvpwm->blink_off_duration =
752 readl_relaxed(mvebu_pwmreg_blink_off_duration(mvpwm));
753 }
754
755 static void __maybe_unused mvebu_pwm_resume(struct mvebu_gpio_chip *mvchip)
756 {
757 struct mvebu_pwm *mvpwm = mvchip->mvpwm;
758
759 regmap_write(mvchip->regs, GPIO_BLINK_CNT_SELECT_OFF + mvchip->offset,
760 mvpwm->blink_select);
761 writel_relaxed(mvpwm->blink_on_duration,
762 mvebu_pwmreg_blink_on_duration(mvpwm));
763 writel_relaxed(mvpwm->blink_off_duration,
764 mvebu_pwmreg_blink_off_duration(mvpwm));
765 }
766
767 static int mvebu_pwm_probe(struct platform_device *pdev,
768 struct mvebu_gpio_chip *mvchip,
769 int id)
770 {
771 struct device *dev = &pdev->dev;
772 struct mvebu_pwm *mvpwm;
773 struct resource *res;
774 u32 set;
775
776 if (!of_device_is_compatible(mvchip->chip.of_node,
777 "marvell,armada-370-gpio"))
778 return 0;
779
780 /*
781 * There are only two sets of PWM configuration registers for
782 * all the GPIO lines on those SoCs which this driver reserves
783 * for the first two GPIO chips. So if the resource is missing
784 * we can't treat it as an error.
785 */
786 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pwm");
787 if (!res)
788 return 0;
789
790 if (IS_ERR(mvchip->clk))
791 return PTR_ERR(mvchip->clk);
792
793 /*
794 * Use set A for lines of GPIO chip with id 0, B for GPIO chip
795 * with id 1. Don't allow further GPIO chips to be used for PWM.
796 */
797 if (id == 0)
798 set = 0;
799 else if (id == 1)
800 set = U32_MAX;
801 else
802 return -EINVAL;
803 regmap_write(mvchip->regs,
804 GPIO_BLINK_CNT_SELECT_OFF + mvchip->offset, set);
805
806 mvpwm = devm_kzalloc(dev, sizeof(struct mvebu_pwm), GFP_KERNEL);
807 if (!mvpwm)
808 return -ENOMEM;
809 mvchip->mvpwm = mvpwm;
810 mvpwm->mvchip = mvchip;
811
812 mvpwm->membase = devm_ioremap_resource(dev, res);
813 if (IS_ERR(mvpwm->membase))
814 return PTR_ERR(mvpwm->membase);
815
816 mvpwm->clk_rate = clk_get_rate(mvchip->clk);
817 if (!mvpwm->clk_rate) {
818 dev_err(dev, "failed to get clock rate\n");
819 return -EINVAL;
820 }
821
822 mvpwm->chip.dev = dev;
823 mvpwm->chip.ops = &mvebu_pwm_ops;
824 mvpwm->chip.npwm = mvchip->chip.ngpio;
825 /*
826 * There may already be some PWM allocated, so we can't force
827 * mvpwm->chip.base to a fixed point like mvchip->chip.base.
828 * So, we let pwmchip_add() do the numbering and take the next free
829 * region.
830 */
831 mvpwm->chip.base = -1;
832
833 spin_lock_init(&mvpwm->lock);
834
835 return pwmchip_add(&mvpwm->chip);
836 }
837
838 #ifdef CONFIG_DEBUG_FS
839 #include <linux/seq_file.h>
840
841 static void mvebu_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
842 {
843 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
844 u32 out, io_conf, blink, in_pol, data_in, cause, edg_msk, lvl_msk;
845 int i;
846
847 regmap_read(mvchip->regs, GPIO_OUT_OFF + mvchip->offset, &out);
848 regmap_read(mvchip->regs, GPIO_IO_CONF_OFF + mvchip->offset, &io_conf);
849 regmap_read(mvchip->regs, GPIO_BLINK_EN_OFF + mvchip->offset, &blink);
850 regmap_read(mvchip->regs, GPIO_IN_POL_OFF + mvchip->offset, &in_pol);
851 regmap_read(mvchip->regs, GPIO_DATA_IN_OFF + mvchip->offset, &data_in);
852 cause = mvebu_gpio_read_edge_cause(mvchip);
853 edg_msk = mvebu_gpio_read_edge_mask(mvchip);
854 lvl_msk = mvebu_gpio_read_level_mask(mvchip);
855
856 for (i = 0; i < chip->ngpio; i++) {
857 const char *label;
858 u32 msk;
859 bool is_out;
860
861 label = gpiochip_is_requested(chip, i);
862 if (!label)
863 continue;
864
865 msk = BIT(i);
866 is_out = !(io_conf & msk);
867
868 seq_printf(s, " gpio-%-3d (%-20.20s)", chip->base + i, label);
869
870 if (is_out) {
871 seq_printf(s, " out %s %s\n",
872 out & msk ? "hi" : "lo",
873 blink & msk ? "(blink )" : "");
874 continue;
875 }
876
877 seq_printf(s, " in %s (act %s) - IRQ",
878 (data_in ^ in_pol) & msk ? "hi" : "lo",
879 in_pol & msk ? "lo" : "hi");
880 if (!((edg_msk | lvl_msk) & msk)) {
881 seq_puts(s, " disabled\n");
882 continue;
883 }
884 if (edg_msk & msk)
885 seq_puts(s, " edge ");
886 if (lvl_msk & msk)
887 seq_puts(s, " level");
888 seq_printf(s, " (%s)\n", cause & msk ? "pending" : "clear ");
889 }
890 }
891 #else
892 #define mvebu_gpio_dbg_show NULL
893 #endif
894
895 static const struct of_device_id mvebu_gpio_of_match[] = {
896 {
897 .compatible = "marvell,orion-gpio",
898 .data = (void *) MVEBU_GPIO_SOC_VARIANT_ORION,
899 },
900 {
901 .compatible = "marvell,mv78200-gpio",
902 .data = (void *) MVEBU_GPIO_SOC_VARIANT_MV78200,
903 },
904 {
905 .compatible = "marvell,armadaxp-gpio",
906 .data = (void *) MVEBU_GPIO_SOC_VARIANT_ARMADAXP,
907 },
908 {
909 .compatible = "marvell,armada-370-gpio",
910 .data = (void *) MVEBU_GPIO_SOC_VARIANT_ORION,
911 },
912 {
913 .compatible = "marvell,armada-8k-gpio",
914 .data = (void *) MVEBU_GPIO_SOC_VARIANT_A8K,
915 },
916 {
917 /* sentinel */
918 },
919 };
920
921 static int mvebu_gpio_suspend(struct platform_device *pdev, pm_message_t state)
922 {
923 struct mvebu_gpio_chip *mvchip = platform_get_drvdata(pdev);
924 int i;
925
926 regmap_read(mvchip->regs, GPIO_OUT_OFF + mvchip->offset,
927 &mvchip->out_reg);
928 regmap_read(mvchip->regs, GPIO_IO_CONF_OFF + mvchip->offset,
929 &mvchip->io_conf_reg);
930 regmap_read(mvchip->regs, GPIO_BLINK_EN_OFF + mvchip->offset,
931 &mvchip->blink_en_reg);
932 regmap_read(mvchip->regs, GPIO_IN_POL_OFF + mvchip->offset,
933 &mvchip->in_pol_reg);
934
935 switch (mvchip->soc_variant) {
936 case MVEBU_GPIO_SOC_VARIANT_ORION:
937 case MVEBU_GPIO_SOC_VARIANT_A8K:
938 regmap_read(mvchip->regs, GPIO_EDGE_MASK_OFF + mvchip->offset,
939 &mvchip->edge_mask_regs[0]);
940 regmap_read(mvchip->regs, GPIO_LEVEL_MASK_OFF + mvchip->offset,
941 &mvchip->level_mask_regs[0]);
942 break;
943 case MVEBU_GPIO_SOC_VARIANT_MV78200:
944 for (i = 0; i < 2; i++) {
945 regmap_read(mvchip->regs,
946 GPIO_EDGE_MASK_MV78200_OFF(i),
947 &mvchip->edge_mask_regs[i]);
948 regmap_read(mvchip->regs,
949 GPIO_LEVEL_MASK_MV78200_OFF(i),
950 &mvchip->level_mask_regs[i]);
951 }
952 break;
953 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
954 for (i = 0; i < 4; i++) {
955 regmap_read(mvchip->regs,
956 GPIO_EDGE_MASK_ARMADAXP_OFF(i),
957 &mvchip->edge_mask_regs[i]);
958 regmap_read(mvchip->regs,
959 GPIO_LEVEL_MASK_ARMADAXP_OFF(i),
960 &mvchip->level_mask_regs[i]);
961 }
962 break;
963 default:
964 BUG();
965 }
966
967 if (IS_ENABLED(CONFIG_PWM))
968 mvebu_pwm_suspend(mvchip);
969
970 return 0;
971 }
972
973 static int mvebu_gpio_resume(struct platform_device *pdev)
974 {
975 struct mvebu_gpio_chip *mvchip = platform_get_drvdata(pdev);
976 int i;
977
978 regmap_write(mvchip->regs, GPIO_OUT_OFF + mvchip->offset,
979 mvchip->out_reg);
980 regmap_write(mvchip->regs, GPIO_IO_CONF_OFF + mvchip->offset,
981 mvchip->io_conf_reg);
982 regmap_write(mvchip->regs, GPIO_BLINK_EN_OFF + mvchip->offset,
983 mvchip->blink_en_reg);
984 regmap_write(mvchip->regs, GPIO_IN_POL_OFF + mvchip->offset,
985 mvchip->in_pol_reg);
986
987 switch (mvchip->soc_variant) {
988 case MVEBU_GPIO_SOC_VARIANT_ORION:
989 case MVEBU_GPIO_SOC_VARIANT_A8K:
990 regmap_write(mvchip->regs, GPIO_EDGE_MASK_OFF + mvchip->offset,
991 mvchip->edge_mask_regs[0]);
992 regmap_write(mvchip->regs, GPIO_LEVEL_MASK_OFF + mvchip->offset,
993 mvchip->level_mask_regs[0]);
994 break;
995 case MVEBU_GPIO_SOC_VARIANT_MV78200:
996 for (i = 0; i < 2; i++) {
997 regmap_write(mvchip->regs,
998 GPIO_EDGE_MASK_MV78200_OFF(i),
999 mvchip->edge_mask_regs[i]);
1000 regmap_write(mvchip->regs,
1001 GPIO_LEVEL_MASK_MV78200_OFF(i),
1002 mvchip->level_mask_regs[i]);
1003 }
1004 break;
1005 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
1006 for (i = 0; i < 4; i++) {
1007 regmap_write(mvchip->regs,
1008 GPIO_EDGE_MASK_ARMADAXP_OFF(i),
1009 mvchip->edge_mask_regs[i]);
1010 regmap_write(mvchip->regs,
1011 GPIO_LEVEL_MASK_ARMADAXP_OFF(i),
1012 mvchip->level_mask_regs[i]);
1013 }
1014 break;
1015 default:
1016 BUG();
1017 }
1018
1019 if (IS_ENABLED(CONFIG_PWM))
1020 mvebu_pwm_resume(mvchip);
1021
1022 return 0;
1023 }
1024
1025 static const struct regmap_config mvebu_gpio_regmap_config = {
1026 .reg_bits = 32,
1027 .reg_stride = 4,
1028 .val_bits = 32,
1029 .fast_io = true,
1030 };
1031
1032 static int mvebu_gpio_probe_raw(struct platform_device *pdev,
1033 struct mvebu_gpio_chip *mvchip)
1034 {
1035 struct resource *res;
1036 void __iomem *base;
1037
1038 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1039 base = devm_ioremap_resource(&pdev->dev, res);
1040 if (IS_ERR(base))
1041 return PTR_ERR(base);
1042
1043 mvchip->regs = devm_regmap_init_mmio(&pdev->dev, base,
1044 &mvebu_gpio_regmap_config);
1045 if (IS_ERR(mvchip->regs))
1046 return PTR_ERR(mvchip->regs);
1047
1048 /*
1049 * For the legacy SoCs, the regmap directly maps to the GPIO
1050 * registers, so no offset is needed.
1051 */
1052 mvchip->offset = 0;
1053
1054 /*
1055 * The Armada XP has a second range of registers for the
1056 * per-CPU registers
1057 */
1058 if (mvchip->soc_variant == MVEBU_GPIO_SOC_VARIANT_ARMADAXP) {
1059 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1060 base = devm_ioremap_resource(&pdev->dev, res);
1061 if (IS_ERR(base))
1062 return PTR_ERR(base);
1063
1064 mvchip->percpu_regs =
1065 devm_regmap_init_mmio(&pdev->dev, base,
1066 &mvebu_gpio_regmap_config);
1067 if (IS_ERR(mvchip->percpu_regs))
1068 return PTR_ERR(mvchip->percpu_regs);
1069 }
1070
1071 return 0;
1072 }
1073
1074 static int mvebu_gpio_probe_syscon(struct platform_device *pdev,
1075 struct mvebu_gpio_chip *mvchip)
1076 {
1077 mvchip->regs = syscon_node_to_regmap(pdev->dev.parent->of_node);
1078 if (IS_ERR(mvchip->regs))
1079 return PTR_ERR(mvchip->regs);
1080
1081 if (of_property_read_u32(pdev->dev.of_node, "offset", &mvchip->offset))
1082 return -EINVAL;
1083
1084 return 0;
1085 }
1086
1087 static int mvebu_gpio_probe(struct platform_device *pdev)
1088 {
1089 struct mvebu_gpio_chip *mvchip;
1090 const struct of_device_id *match;
1091 struct device_node *np = pdev->dev.of_node;
1092 struct irq_chip_generic *gc;
1093 struct irq_chip_type *ct;
1094 unsigned int ngpios;
1095 bool have_irqs;
1096 int soc_variant;
1097 int i, cpu, id;
1098 int err;
1099
1100 match = of_match_device(mvebu_gpio_of_match, &pdev->dev);
1101 if (match)
1102 soc_variant = (unsigned long) match->data;
1103 else
1104 soc_variant = MVEBU_GPIO_SOC_VARIANT_ORION;
1105
1106 /* Some gpio controllers do not provide irq support */
1107 have_irqs = of_irq_count(np) != 0;
1108
1109 mvchip = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_gpio_chip),
1110 GFP_KERNEL);
1111 if (!mvchip)
1112 return -ENOMEM;
1113
1114 platform_set_drvdata(pdev, mvchip);
1115
1116 if (of_property_read_u32(pdev->dev.of_node, "ngpios", &ngpios)) {
1117 dev_err(&pdev->dev, "Missing ngpios OF property\n");
1118 return -ENODEV;
1119 }
1120
1121 id = of_alias_get_id(pdev->dev.of_node, "gpio");
1122 if (id < 0) {
1123 dev_err(&pdev->dev, "Couldn't get OF id\n");
1124 return id;
1125 }
1126
1127 mvchip->clk = devm_clk_get(&pdev->dev, NULL);
1128 /* Not all SoCs require a clock.*/
1129 if (!IS_ERR(mvchip->clk))
1130 clk_prepare_enable(mvchip->clk);
1131
1132 mvchip->soc_variant = soc_variant;
1133 mvchip->chip.label = dev_name(&pdev->dev);
1134 mvchip->chip.parent = &pdev->dev;
1135 mvchip->chip.request = gpiochip_generic_request;
1136 mvchip->chip.free = gpiochip_generic_free;
1137 mvchip->chip.direction_input = mvebu_gpio_direction_input;
1138 mvchip->chip.get = mvebu_gpio_get;
1139 mvchip->chip.direction_output = mvebu_gpio_direction_output;
1140 mvchip->chip.set = mvebu_gpio_set;
1141 if (have_irqs)
1142 mvchip->chip.to_irq = mvebu_gpio_to_irq;
1143 mvchip->chip.base = id * MVEBU_MAX_GPIO_PER_BANK;
1144 mvchip->chip.ngpio = ngpios;
1145 mvchip->chip.can_sleep = false;
1146 mvchip->chip.of_node = np;
1147 mvchip->chip.dbg_show = mvebu_gpio_dbg_show;
1148
1149 if (soc_variant == MVEBU_GPIO_SOC_VARIANT_A8K)
1150 err = mvebu_gpio_probe_syscon(pdev, mvchip);
1151 else
1152 err = mvebu_gpio_probe_raw(pdev, mvchip);
1153
1154 if (err)
1155 return err;
1156
1157 /*
1158 * Mask and clear GPIO interrupts.
1159 */
1160 switch (soc_variant) {
1161 case MVEBU_GPIO_SOC_VARIANT_ORION:
1162 case MVEBU_GPIO_SOC_VARIANT_A8K:
1163 regmap_write(mvchip->regs,
1164 GPIO_EDGE_CAUSE_OFF + mvchip->offset, 0);
1165 regmap_write(mvchip->regs,
1166 GPIO_EDGE_MASK_OFF + mvchip->offset, 0);
1167 regmap_write(mvchip->regs,
1168 GPIO_LEVEL_MASK_OFF + mvchip->offset, 0);
1169 break;
1170 case MVEBU_GPIO_SOC_VARIANT_MV78200:
1171 regmap_write(mvchip->regs, GPIO_EDGE_CAUSE_OFF, 0);
1172 for (cpu = 0; cpu < 2; cpu++) {
1173 regmap_write(mvchip->regs,
1174 GPIO_EDGE_MASK_MV78200_OFF(cpu), 0);
1175 regmap_write(mvchip->regs,
1176 GPIO_LEVEL_MASK_MV78200_OFF(cpu), 0);
1177 }
1178 break;
1179 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
1180 regmap_write(mvchip->regs, GPIO_EDGE_CAUSE_OFF, 0);
1181 regmap_write(mvchip->regs, GPIO_EDGE_MASK_OFF, 0);
1182 regmap_write(mvchip->regs, GPIO_LEVEL_MASK_OFF, 0);
1183 for (cpu = 0; cpu < 4; cpu++) {
1184 regmap_write(mvchip->percpu_regs,
1185 GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu), 0);
1186 regmap_write(mvchip->percpu_regs,
1187 GPIO_EDGE_MASK_ARMADAXP_OFF(cpu), 0);
1188 regmap_write(mvchip->percpu_regs,
1189 GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu), 0);
1190 }
1191 break;
1192 default:
1193 BUG();
1194 }
1195
1196 devm_gpiochip_add_data(&pdev->dev, &mvchip->chip, mvchip);
1197
1198 /* Some gpio controllers do not provide irq support */
1199 if (!have_irqs)
1200 return 0;
1201
1202 mvchip->domain =
1203 irq_domain_add_linear(np, ngpios, &irq_generic_chip_ops, NULL);
1204 if (!mvchip->domain) {
1205 dev_err(&pdev->dev, "couldn't allocate irq domain %s (DT).\n",
1206 mvchip->chip.label);
1207 return -ENODEV;
1208 }
1209
1210 err = irq_alloc_domain_generic_chips(
1211 mvchip->domain, ngpios, 2, np->name, handle_level_irq,
1212 IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_LEVEL, 0, 0);
1213 if (err) {
1214 dev_err(&pdev->dev, "couldn't allocate irq chips %s (DT).\n",
1215 mvchip->chip.label);
1216 goto err_domain;
1217 }
1218
1219 /*
1220 * NOTE: The common accessors cannot be used because of the percpu
1221 * access to the mask registers
1222 */
1223 gc = irq_get_domain_generic_chip(mvchip->domain, 0);
1224 gc->private = mvchip;
1225 ct = &gc->chip_types[0];
1226 ct->type = IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW;
1227 ct->chip.irq_mask = mvebu_gpio_level_irq_mask;
1228 ct->chip.irq_unmask = mvebu_gpio_level_irq_unmask;
1229 ct->chip.irq_set_type = mvebu_gpio_irq_set_type;
1230 ct->chip.name = mvchip->chip.label;
1231
1232 ct = &gc->chip_types[1];
1233 ct->type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
1234 ct->chip.irq_ack = mvebu_gpio_irq_ack;
1235 ct->chip.irq_mask = mvebu_gpio_edge_irq_mask;
1236 ct->chip.irq_unmask = mvebu_gpio_edge_irq_unmask;
1237 ct->chip.irq_set_type = mvebu_gpio_irq_set_type;
1238 ct->handler = handle_edge_irq;
1239 ct->chip.name = mvchip->chip.label;
1240
1241 /*
1242 * Setup the interrupt handlers. Each chip can have up to 4
1243 * interrupt handlers, with each handler dealing with 8 GPIO
1244 * pins.
1245 */
1246 for (i = 0; i < 4; i++) {
1247 int irq = platform_get_irq(pdev, i);
1248
1249 if (irq < 0)
1250 continue;
1251 irq_set_chained_handler_and_data(irq, mvebu_gpio_irq_handler,
1252 mvchip);
1253 }
1254
1255 /* Some MVEBU SoCs have simple PWM support for GPIO lines */
1256 if (IS_ENABLED(CONFIG_PWM))
1257 return mvebu_pwm_probe(pdev, mvchip, id);
1258
1259 return 0;
1260
1261 err_domain:
1262 irq_domain_remove(mvchip->domain);
1263
1264 return err;
1265 }
1266
1267 static struct platform_driver mvebu_gpio_driver = {
1268 .driver = {
1269 .name = "mvebu-gpio",
1270 .of_match_table = mvebu_gpio_of_match,
1271 },
1272 .probe = mvebu_gpio_probe,
1273 .suspend = mvebu_gpio_suspend,
1274 .resume = mvebu_gpio_resume,
1275 };
1276 builtin_platform_driver(mvebu_gpio_driver);
Linux with added FPC-III support