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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
96struct 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
110struct 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
137static 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
159static u32
160mvebu_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
172static void
173mvebu_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
182static inline void
183mvebu_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
209static u32
210mvebu_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
222static void
223mvebu_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
232static void
233mvebu_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
259static u32
260mvebu_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
272static void
273mvebu_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 */
286static void __iomem *mvebu_pwmreg_blink_on_duration(struct mvebu_pwm *mvpwm)
287{
288 return mvpwm->membase + PWM_BLINK_ON_DURATION_OFF;
289}
290
291static 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 */
299static 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
307static 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
329static 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
338static 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
357static 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
380static 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 */
390static 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
401static 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
414static 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
427static 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
440static 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
479static 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
543static 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 */
593static struct mvebu_pwm *to_mvebu_pwm(struct pwm_chip *chip)
594{
595 return container_of(chip, struct mvebu_pwm, chip);
596}
597
598static 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 }
629out:
630 spin_unlock_irqrestore(&mvpwm->lock, flags);
631 return ret;
632}
633
634static 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
645static 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
693static 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
735static 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
743static 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
755static 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
767static 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 if (IS_ERR(mvchip->clk))
781 return PTR_ERR(mvchip->clk);
782
783 /*
784 * There are only two sets of PWM configuration registers for
785 * all the GPIO lines on those SoCs which this driver reserves
786 * for the first two GPIO chips. So if the resource is missing
787 * we can't treat it as an error.
788 */
789 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pwm");
790 if (!res)
791 return 0;
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
841static 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
895static 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
921static 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
973static 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
1025static 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
1032static 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
1074static 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
1087static 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
1261err_domain:
1262 irq_domain_remove(mvchip->domain);
1263
1264 return err;
1265}
1266
1267static 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};
1276builtin_platform_driver(mvebu_gpio_driver);
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/err.h>
37#include <linux/module.h>
38#include <linux/gpio.h>
39#include <linux/irq.h>
40#include <linux/slab.h>
41#include <linux/irqdomain.h>
42#include <linux/io.h>
43#include <linux/of_irq.h>
44#include <linux/of_device.h>
45#include <linux/clk.h>
46#include <linux/pinctrl/consumer.h>
47#include <linux/irqchip/chained_irq.h>
48
49/*
50 * GPIO unit register offsets.
51 */
52#define GPIO_OUT_OFF 0x0000
53#define GPIO_IO_CONF_OFF 0x0004
54#define GPIO_BLINK_EN_OFF 0x0008
55#define GPIO_IN_POL_OFF 0x000c
56#define GPIO_DATA_IN_OFF 0x0010
57#define GPIO_EDGE_CAUSE_OFF 0x0014
58#define GPIO_EDGE_MASK_OFF 0x0018
59#define GPIO_LEVEL_MASK_OFF 0x001c
60
61/* The MV78200 has per-CPU registers for edge mask and level mask */
62#define GPIO_EDGE_MASK_MV78200_OFF(cpu) ((cpu) ? 0x30 : 0x18)
63#define GPIO_LEVEL_MASK_MV78200_OFF(cpu) ((cpu) ? 0x34 : 0x1C)
64
65/* The Armada XP has per-CPU registers for interrupt cause, interrupt
66 * mask and interrupt level mask. Those are relative to the
67 * percpu_membase. */
68#define GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu) ((cpu) * 0x4)
69#define GPIO_EDGE_MASK_ARMADAXP_OFF(cpu) (0x10 + (cpu) * 0x4)
70#define GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu) (0x20 + (cpu) * 0x4)
71
72#define MVEBU_GPIO_SOC_VARIANT_ORION 0x1
73#define MVEBU_GPIO_SOC_VARIANT_MV78200 0x2
74#define MVEBU_GPIO_SOC_VARIANT_ARMADAXP 0x3
75
76#define MVEBU_MAX_GPIO_PER_BANK 32
77
78struct mvebu_gpio_chip {
79 struct gpio_chip chip;
80 spinlock_t lock;
81 void __iomem *membase;
82 void __iomem *percpu_membase;
83 int irqbase;
84 struct irq_domain *domain;
85 int soc_variant;
86
87 /* Used to preserve GPIO registers across suspend/resume */
88 u32 out_reg;
89 u32 io_conf_reg;
90 u32 blink_en_reg;
91 u32 in_pol_reg;
92 u32 edge_mask_regs[4];
93 u32 level_mask_regs[4];
94};
95
96/*
97 * Functions returning addresses of individual registers for a given
98 * GPIO controller.
99 */
100static inline void __iomem *mvebu_gpioreg_out(struct mvebu_gpio_chip *mvchip)
101{
102 return mvchip->membase + GPIO_OUT_OFF;
103}
104
105static inline void __iomem *mvebu_gpioreg_blink(struct mvebu_gpio_chip *mvchip)
106{
107 return mvchip->membase + GPIO_BLINK_EN_OFF;
108}
109
110static inline void __iomem *
111mvebu_gpioreg_io_conf(struct mvebu_gpio_chip *mvchip)
112{
113 return mvchip->membase + GPIO_IO_CONF_OFF;
114}
115
116static inline void __iomem *mvebu_gpioreg_in_pol(struct mvebu_gpio_chip *mvchip)
117{
118 return mvchip->membase + GPIO_IN_POL_OFF;
119}
120
121static inline void __iomem *
122mvebu_gpioreg_data_in(struct mvebu_gpio_chip *mvchip)
123{
124 return mvchip->membase + GPIO_DATA_IN_OFF;
125}
126
127static inline void __iomem *
128mvebu_gpioreg_edge_cause(struct mvebu_gpio_chip *mvchip)
129{
130 int cpu;
131
132 switch (mvchip->soc_variant) {
133 case MVEBU_GPIO_SOC_VARIANT_ORION:
134 case MVEBU_GPIO_SOC_VARIANT_MV78200:
135 return mvchip->membase + GPIO_EDGE_CAUSE_OFF;
136 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
137 cpu = smp_processor_id();
138 return mvchip->percpu_membase +
139 GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu);
140 default:
141 BUG();
142 }
143}
144
145static inline void __iomem *
146mvebu_gpioreg_edge_mask(struct mvebu_gpio_chip *mvchip)
147{
148 int cpu;
149
150 switch (mvchip->soc_variant) {
151 case MVEBU_GPIO_SOC_VARIANT_ORION:
152 return mvchip->membase + GPIO_EDGE_MASK_OFF;
153 case MVEBU_GPIO_SOC_VARIANT_MV78200:
154 cpu = smp_processor_id();
155 return mvchip->membase + GPIO_EDGE_MASK_MV78200_OFF(cpu);
156 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
157 cpu = smp_processor_id();
158 return mvchip->percpu_membase +
159 GPIO_EDGE_MASK_ARMADAXP_OFF(cpu);
160 default:
161 BUG();
162 }
163}
164
165static void __iomem *mvebu_gpioreg_level_mask(struct mvebu_gpio_chip *mvchip)
166{
167 int cpu;
168
169 switch (mvchip->soc_variant) {
170 case MVEBU_GPIO_SOC_VARIANT_ORION:
171 return mvchip->membase + GPIO_LEVEL_MASK_OFF;
172 case MVEBU_GPIO_SOC_VARIANT_MV78200:
173 cpu = smp_processor_id();
174 return mvchip->membase + GPIO_LEVEL_MASK_MV78200_OFF(cpu);
175 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
176 cpu = smp_processor_id();
177 return mvchip->percpu_membase +
178 GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu);
179 default:
180 BUG();
181 }
182}
183
184/*
185 * Functions implementing the gpio_chip methods
186 */
187
188static void mvebu_gpio_set(struct gpio_chip *chip, unsigned pin, int value)
189{
190 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
191 unsigned long flags;
192 u32 u;
193
194 spin_lock_irqsave(&mvchip->lock, flags);
195 u = readl_relaxed(mvebu_gpioreg_out(mvchip));
196 if (value)
197 u |= 1 << pin;
198 else
199 u &= ~(1 << pin);
200 writel_relaxed(u, mvebu_gpioreg_out(mvchip));
201 spin_unlock_irqrestore(&mvchip->lock, flags);
202}
203
204static int mvebu_gpio_get(struct gpio_chip *chip, unsigned pin)
205{
206 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
207 u32 u;
208
209 if (readl_relaxed(mvebu_gpioreg_io_conf(mvchip)) & (1 << pin)) {
210 u = readl_relaxed(mvebu_gpioreg_data_in(mvchip)) ^
211 readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
212 } else {
213 u = readl_relaxed(mvebu_gpioreg_out(mvchip));
214 }
215
216 return (u >> pin) & 1;
217}
218
219static void mvebu_gpio_blink(struct gpio_chip *chip, unsigned pin, int value)
220{
221 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
222 unsigned long flags;
223 u32 u;
224
225 spin_lock_irqsave(&mvchip->lock, flags);
226 u = readl_relaxed(mvebu_gpioreg_blink(mvchip));
227 if (value)
228 u |= 1 << pin;
229 else
230 u &= ~(1 << pin);
231 writel_relaxed(u, mvebu_gpioreg_blink(mvchip));
232 spin_unlock_irqrestore(&mvchip->lock, flags);
233}
234
235static int mvebu_gpio_direction_input(struct gpio_chip *chip, unsigned pin)
236{
237 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
238 unsigned long flags;
239 int ret;
240 u32 u;
241
242 /* Check with the pinctrl driver whether this pin is usable as
243 * an input GPIO */
244 ret = pinctrl_gpio_direction_input(chip->base + pin);
245 if (ret)
246 return ret;
247
248 spin_lock_irqsave(&mvchip->lock, flags);
249 u = readl_relaxed(mvebu_gpioreg_io_conf(mvchip));
250 u |= 1 << pin;
251 writel_relaxed(u, mvebu_gpioreg_io_conf(mvchip));
252 spin_unlock_irqrestore(&mvchip->lock, flags);
253
254 return 0;
255}
256
257static int mvebu_gpio_direction_output(struct gpio_chip *chip, unsigned pin,
258 int value)
259{
260 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
261 unsigned long flags;
262 int ret;
263 u32 u;
264
265 /* Check with the pinctrl driver whether this pin is usable as
266 * an output GPIO */
267 ret = pinctrl_gpio_direction_output(chip->base + pin);
268 if (ret)
269 return ret;
270
271 mvebu_gpio_blink(chip, pin, 0);
272 mvebu_gpio_set(chip, pin, value);
273
274 spin_lock_irqsave(&mvchip->lock, flags);
275 u = readl_relaxed(mvebu_gpioreg_io_conf(mvchip));
276 u &= ~(1 << pin);
277 writel_relaxed(u, mvebu_gpioreg_io_conf(mvchip));
278 spin_unlock_irqrestore(&mvchip->lock, flags);
279
280 return 0;
281}
282
283static int mvebu_gpio_to_irq(struct gpio_chip *chip, unsigned pin)
284{
285 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
286 return irq_create_mapping(mvchip->domain, pin);
287}
288
289/*
290 * Functions implementing the irq_chip methods
291 */
292static void mvebu_gpio_irq_ack(struct irq_data *d)
293{
294 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
295 struct mvebu_gpio_chip *mvchip = gc->private;
296 u32 mask = ~(1 << (d->irq - gc->irq_base));
297
298 irq_gc_lock(gc);
299 writel_relaxed(mask, mvebu_gpioreg_edge_cause(mvchip));
300 irq_gc_unlock(gc);
301}
302
303static void mvebu_gpio_edge_irq_mask(struct irq_data *d)
304{
305 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
306 struct mvebu_gpio_chip *mvchip = gc->private;
307 struct irq_chip_type *ct = irq_data_get_chip_type(d);
308 u32 mask = 1 << (d->irq - gc->irq_base);
309
310 irq_gc_lock(gc);
311 ct->mask_cache_priv &= ~mask;
312
313 writel_relaxed(ct->mask_cache_priv, mvebu_gpioreg_edge_mask(mvchip));
314 irq_gc_unlock(gc);
315}
316
317static void mvebu_gpio_edge_irq_unmask(struct irq_data *d)
318{
319 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
320 struct mvebu_gpio_chip *mvchip = gc->private;
321 struct irq_chip_type *ct = irq_data_get_chip_type(d);
322
323 u32 mask = 1 << (d->irq - gc->irq_base);
324
325 irq_gc_lock(gc);
326 ct->mask_cache_priv |= mask;
327 writel_relaxed(ct->mask_cache_priv, mvebu_gpioreg_edge_mask(mvchip));
328 irq_gc_unlock(gc);
329}
330
331static void mvebu_gpio_level_irq_mask(struct irq_data *d)
332{
333 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
334 struct mvebu_gpio_chip *mvchip = gc->private;
335 struct irq_chip_type *ct = irq_data_get_chip_type(d);
336
337 u32 mask = 1 << (d->irq - gc->irq_base);
338
339 irq_gc_lock(gc);
340 ct->mask_cache_priv &= ~mask;
341 writel_relaxed(ct->mask_cache_priv, mvebu_gpioreg_level_mask(mvchip));
342 irq_gc_unlock(gc);
343}
344
345static void mvebu_gpio_level_irq_unmask(struct irq_data *d)
346{
347 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
348 struct mvebu_gpio_chip *mvchip = gc->private;
349 struct irq_chip_type *ct = irq_data_get_chip_type(d);
350
351 u32 mask = 1 << (d->irq - gc->irq_base);
352
353 irq_gc_lock(gc);
354 ct->mask_cache_priv |= mask;
355 writel_relaxed(ct->mask_cache_priv, mvebu_gpioreg_level_mask(mvchip));
356 irq_gc_unlock(gc);
357}
358
359/*****************************************************************************
360 * MVEBU GPIO IRQ
361 *
362 * GPIO_IN_POL register controls whether GPIO_DATA_IN will hold the same
363 * value of the line or the opposite value.
364 *
365 * Level IRQ handlers: DATA_IN is used directly as cause register.
366 * Interrupt are masked by LEVEL_MASK registers.
367 * Edge IRQ handlers: Change in DATA_IN are latched in EDGE_CAUSE.
368 * Interrupt are masked by EDGE_MASK registers.
369 * Both-edge handlers: Similar to regular Edge handlers, but also swaps
370 * the polarity to catch the next line transaction.
371 * This is a race condition that might not perfectly
372 * work on some use cases.
373 *
374 * Every eight GPIO lines are grouped (OR'ed) before going up to main
375 * cause register.
376 *
377 * EDGE cause mask
378 * data-in /--------| |-----| |----\
379 * -----| |----- ---- to main cause reg
380 * X \----------------| |----/
381 * polarity LEVEL mask
382 *
383 ****************************************************************************/
384
385static int mvebu_gpio_irq_set_type(struct irq_data *d, unsigned int type)
386{
387 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
388 struct irq_chip_type *ct = irq_data_get_chip_type(d);
389 struct mvebu_gpio_chip *mvchip = gc->private;
390 int pin;
391 u32 u;
392
393 pin = d->hwirq;
394
395 u = readl_relaxed(mvebu_gpioreg_io_conf(mvchip)) & (1 << pin);
396 if (!u)
397 return -EINVAL;
398
399 type &= IRQ_TYPE_SENSE_MASK;
400 if (type == IRQ_TYPE_NONE)
401 return -EINVAL;
402
403 /* Check if we need to change chip and handler */
404 if (!(ct->type & type))
405 if (irq_setup_alt_chip(d, type))
406 return -EINVAL;
407
408 /*
409 * Configure interrupt polarity.
410 */
411 switch (type) {
412 case IRQ_TYPE_EDGE_RISING:
413 case IRQ_TYPE_LEVEL_HIGH:
414 u = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
415 u &= ~(1 << pin);
416 writel_relaxed(u, mvebu_gpioreg_in_pol(mvchip));
417 break;
418 case IRQ_TYPE_EDGE_FALLING:
419 case IRQ_TYPE_LEVEL_LOW:
420 u = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
421 u |= 1 << pin;
422 writel_relaxed(u, mvebu_gpioreg_in_pol(mvchip));
423 break;
424 case IRQ_TYPE_EDGE_BOTH: {
425 u32 v;
426
427 v = readl_relaxed(mvebu_gpioreg_in_pol(mvchip)) ^
428 readl_relaxed(mvebu_gpioreg_data_in(mvchip));
429
430 /*
431 * set initial polarity based on current input level
432 */
433 u = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
434 if (v & (1 << pin))
435 u |= 1 << pin; /* falling */
436 else
437 u &= ~(1 << pin); /* rising */
438 writel_relaxed(u, mvebu_gpioreg_in_pol(mvchip));
439 break;
440 }
441 }
442 return 0;
443}
444
445static void mvebu_gpio_irq_handler(struct irq_desc *desc)
446{
447 struct mvebu_gpio_chip *mvchip = irq_desc_get_handler_data(desc);
448 struct irq_chip *chip = irq_desc_get_chip(desc);
449 u32 cause, type;
450 int i;
451
452 if (mvchip == NULL)
453 return;
454
455 chained_irq_enter(chip, desc);
456
457 cause = readl_relaxed(mvebu_gpioreg_data_in(mvchip)) &
458 readl_relaxed(mvebu_gpioreg_level_mask(mvchip));
459 cause |= readl_relaxed(mvebu_gpioreg_edge_cause(mvchip)) &
460 readl_relaxed(mvebu_gpioreg_edge_mask(mvchip));
461
462 for (i = 0; i < mvchip->chip.ngpio; i++) {
463 int irq;
464
465 irq = mvchip->irqbase + i;
466
467 if (!(cause & (1 << i)))
468 continue;
469
470 type = irq_get_trigger_type(irq);
471 if ((type & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH) {
472 /* Swap polarity (race with GPIO line) */
473 u32 polarity;
474
475 polarity = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
476 polarity ^= 1 << i;
477 writel_relaxed(polarity, mvebu_gpioreg_in_pol(mvchip));
478 }
479
480 generic_handle_irq(irq);
481 }
482
483 chained_irq_exit(chip, desc);
484}
485
486#ifdef CONFIG_DEBUG_FS
487#include <linux/seq_file.h>
488
489static void mvebu_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
490{
491 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
492 u32 out, io_conf, blink, in_pol, data_in, cause, edg_msk, lvl_msk;
493 int i;
494
495 out = readl_relaxed(mvebu_gpioreg_out(mvchip));
496 io_conf = readl_relaxed(mvebu_gpioreg_io_conf(mvchip));
497 blink = readl_relaxed(mvebu_gpioreg_blink(mvchip));
498 in_pol = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
499 data_in = readl_relaxed(mvebu_gpioreg_data_in(mvchip));
500 cause = readl_relaxed(mvebu_gpioreg_edge_cause(mvchip));
501 edg_msk = readl_relaxed(mvebu_gpioreg_edge_mask(mvchip));
502 lvl_msk = readl_relaxed(mvebu_gpioreg_level_mask(mvchip));
503
504 for (i = 0; i < chip->ngpio; i++) {
505 const char *label;
506 u32 msk;
507 bool is_out;
508
509 label = gpiochip_is_requested(chip, i);
510 if (!label)
511 continue;
512
513 msk = 1 << i;
514 is_out = !(io_conf & msk);
515
516 seq_printf(s, " gpio-%-3d (%-20.20s)", chip->base + i, label);
517
518 if (is_out) {
519 seq_printf(s, " out %s %s\n",
520 out & msk ? "hi" : "lo",
521 blink & msk ? "(blink )" : "");
522 continue;
523 }
524
525 seq_printf(s, " in %s (act %s) - IRQ",
526 (data_in ^ in_pol) & msk ? "hi" : "lo",
527 in_pol & msk ? "lo" : "hi");
528 if (!((edg_msk | lvl_msk) & msk)) {
529 seq_puts(s, " disabled\n");
530 continue;
531 }
532 if (edg_msk & msk)
533 seq_puts(s, " edge ");
534 if (lvl_msk & msk)
535 seq_puts(s, " level");
536 seq_printf(s, " (%s)\n", cause & msk ? "pending" : "clear ");
537 }
538}
539#else
540#define mvebu_gpio_dbg_show NULL
541#endif
542
543static const struct of_device_id mvebu_gpio_of_match[] = {
544 {
545 .compatible = "marvell,orion-gpio",
546 .data = (void *) MVEBU_GPIO_SOC_VARIANT_ORION,
547 },
548 {
549 .compatible = "marvell,mv78200-gpio",
550 .data = (void *) MVEBU_GPIO_SOC_VARIANT_MV78200,
551 },
552 {
553 .compatible = "marvell,armadaxp-gpio",
554 .data = (void *) MVEBU_GPIO_SOC_VARIANT_ARMADAXP,
555 },
556 {
557 /* sentinel */
558 },
559};
560MODULE_DEVICE_TABLE(of, mvebu_gpio_of_match);
561
562static int mvebu_gpio_suspend(struct platform_device *pdev, pm_message_t state)
563{
564 struct mvebu_gpio_chip *mvchip = platform_get_drvdata(pdev);
565 int i;
566
567 mvchip->out_reg = readl(mvebu_gpioreg_out(mvchip));
568 mvchip->io_conf_reg = readl(mvebu_gpioreg_io_conf(mvchip));
569 mvchip->blink_en_reg = readl(mvebu_gpioreg_blink(mvchip));
570 mvchip->in_pol_reg = readl(mvebu_gpioreg_in_pol(mvchip));
571
572 switch (mvchip->soc_variant) {
573 case MVEBU_GPIO_SOC_VARIANT_ORION:
574 mvchip->edge_mask_regs[0] =
575 readl(mvchip->membase + GPIO_EDGE_MASK_OFF);
576 mvchip->level_mask_regs[0] =
577 readl(mvchip->membase + GPIO_LEVEL_MASK_OFF);
578 break;
579 case MVEBU_GPIO_SOC_VARIANT_MV78200:
580 for (i = 0; i < 2; i++) {
581 mvchip->edge_mask_regs[i] =
582 readl(mvchip->membase +
583 GPIO_EDGE_MASK_MV78200_OFF(i));
584 mvchip->level_mask_regs[i] =
585 readl(mvchip->membase +
586 GPIO_LEVEL_MASK_MV78200_OFF(i));
587 }
588 break;
589 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
590 for (i = 0; i < 4; i++) {
591 mvchip->edge_mask_regs[i] =
592 readl(mvchip->membase +
593 GPIO_EDGE_MASK_ARMADAXP_OFF(i));
594 mvchip->level_mask_regs[i] =
595 readl(mvchip->membase +
596 GPIO_LEVEL_MASK_ARMADAXP_OFF(i));
597 }
598 break;
599 default:
600 BUG();
601 }
602
603 return 0;
604}
605
606static int mvebu_gpio_resume(struct platform_device *pdev)
607{
608 struct mvebu_gpio_chip *mvchip = platform_get_drvdata(pdev);
609 int i;
610
611 writel(mvchip->out_reg, mvebu_gpioreg_out(mvchip));
612 writel(mvchip->io_conf_reg, mvebu_gpioreg_io_conf(mvchip));
613 writel(mvchip->blink_en_reg, mvebu_gpioreg_blink(mvchip));
614 writel(mvchip->in_pol_reg, mvebu_gpioreg_in_pol(mvchip));
615
616 switch (mvchip->soc_variant) {
617 case MVEBU_GPIO_SOC_VARIANT_ORION:
618 writel(mvchip->edge_mask_regs[0],
619 mvchip->membase + GPIO_EDGE_MASK_OFF);
620 writel(mvchip->level_mask_regs[0],
621 mvchip->membase + GPIO_LEVEL_MASK_OFF);
622 break;
623 case MVEBU_GPIO_SOC_VARIANT_MV78200:
624 for (i = 0; i < 2; i++) {
625 writel(mvchip->edge_mask_regs[i],
626 mvchip->membase + GPIO_EDGE_MASK_MV78200_OFF(i));
627 writel(mvchip->level_mask_regs[i],
628 mvchip->membase +
629 GPIO_LEVEL_MASK_MV78200_OFF(i));
630 }
631 break;
632 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
633 for (i = 0; i < 4; i++) {
634 writel(mvchip->edge_mask_regs[i],
635 mvchip->membase +
636 GPIO_EDGE_MASK_ARMADAXP_OFF(i));
637 writel(mvchip->level_mask_regs[i],
638 mvchip->membase +
639 GPIO_LEVEL_MASK_ARMADAXP_OFF(i));
640 }
641 break;
642 default:
643 BUG();
644 }
645
646 return 0;
647}
648
649static int mvebu_gpio_probe(struct platform_device *pdev)
650{
651 struct mvebu_gpio_chip *mvchip;
652 const struct of_device_id *match;
653 struct device_node *np = pdev->dev.of_node;
654 struct resource *res;
655 struct irq_chip_generic *gc;
656 struct irq_chip_type *ct;
657 struct clk *clk;
658 unsigned int ngpios;
659 int soc_variant;
660 int i, cpu, id;
661 int err;
662
663 match = of_match_device(mvebu_gpio_of_match, &pdev->dev);
664 if (match)
665 soc_variant = (int) match->data;
666 else
667 soc_variant = MVEBU_GPIO_SOC_VARIANT_ORION;
668
669 mvchip = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_gpio_chip),
670 GFP_KERNEL);
671 if (!mvchip)
672 return -ENOMEM;
673
674 platform_set_drvdata(pdev, mvchip);
675
676 if (of_property_read_u32(pdev->dev.of_node, "ngpios", &ngpios)) {
677 dev_err(&pdev->dev, "Missing ngpios OF property\n");
678 return -ENODEV;
679 }
680
681 id = of_alias_get_id(pdev->dev.of_node, "gpio");
682 if (id < 0) {
683 dev_err(&pdev->dev, "Couldn't get OF id\n");
684 return id;
685 }
686
687 clk = devm_clk_get(&pdev->dev, NULL);
688 /* Not all SoCs require a clock.*/
689 if (!IS_ERR(clk))
690 clk_prepare_enable(clk);
691
692 mvchip->soc_variant = soc_variant;
693 mvchip->chip.label = dev_name(&pdev->dev);
694 mvchip->chip.parent = &pdev->dev;
695 mvchip->chip.request = gpiochip_generic_request;
696 mvchip->chip.free = gpiochip_generic_free;
697 mvchip->chip.direction_input = mvebu_gpio_direction_input;
698 mvchip->chip.get = mvebu_gpio_get;
699 mvchip->chip.direction_output = mvebu_gpio_direction_output;
700 mvchip->chip.set = mvebu_gpio_set;
701 mvchip->chip.to_irq = mvebu_gpio_to_irq;
702 mvchip->chip.base = id * MVEBU_MAX_GPIO_PER_BANK;
703 mvchip->chip.ngpio = ngpios;
704 mvchip->chip.can_sleep = false;
705 mvchip->chip.of_node = np;
706 mvchip->chip.dbg_show = mvebu_gpio_dbg_show;
707
708 spin_lock_init(&mvchip->lock);
709 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
710 mvchip->membase = devm_ioremap_resource(&pdev->dev, res);
711 if (IS_ERR(mvchip->membase))
712 return PTR_ERR(mvchip->membase);
713
714 /* The Armada XP has a second range of registers for the
715 * per-CPU registers */
716 if (soc_variant == MVEBU_GPIO_SOC_VARIANT_ARMADAXP) {
717 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
718 mvchip->percpu_membase = devm_ioremap_resource(&pdev->dev,
719 res);
720 if (IS_ERR(mvchip->percpu_membase))
721 return PTR_ERR(mvchip->percpu_membase);
722 }
723
724 /*
725 * Mask and clear GPIO interrupts.
726 */
727 switch (soc_variant) {
728 case MVEBU_GPIO_SOC_VARIANT_ORION:
729 writel_relaxed(0, mvchip->membase + GPIO_EDGE_CAUSE_OFF);
730 writel_relaxed(0, mvchip->membase + GPIO_EDGE_MASK_OFF);
731 writel_relaxed(0, mvchip->membase + GPIO_LEVEL_MASK_OFF);
732 break;
733 case MVEBU_GPIO_SOC_VARIANT_MV78200:
734 writel_relaxed(0, mvchip->membase + GPIO_EDGE_CAUSE_OFF);
735 for (cpu = 0; cpu < 2; cpu++) {
736 writel_relaxed(0, mvchip->membase +
737 GPIO_EDGE_MASK_MV78200_OFF(cpu));
738 writel_relaxed(0, mvchip->membase +
739 GPIO_LEVEL_MASK_MV78200_OFF(cpu));
740 }
741 break;
742 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
743 writel_relaxed(0, mvchip->membase + GPIO_EDGE_CAUSE_OFF);
744 writel_relaxed(0, mvchip->membase + GPIO_EDGE_MASK_OFF);
745 writel_relaxed(0, mvchip->membase + GPIO_LEVEL_MASK_OFF);
746 for (cpu = 0; cpu < 4; cpu++) {
747 writel_relaxed(0, mvchip->percpu_membase +
748 GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu));
749 writel_relaxed(0, mvchip->percpu_membase +
750 GPIO_EDGE_MASK_ARMADAXP_OFF(cpu));
751 writel_relaxed(0, mvchip->percpu_membase +
752 GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu));
753 }
754 break;
755 default:
756 BUG();
757 }
758
759 devm_gpiochip_add_data(&pdev->dev, &mvchip->chip, mvchip);
760
761 /* Some gpio controllers do not provide irq support */
762 if (!of_irq_count(np))
763 return 0;
764
765 /* Setup the interrupt handlers. Each chip can have up to 4
766 * interrupt handlers, with each handler dealing with 8 GPIO
767 * pins. */
768 for (i = 0; i < 4; i++) {
769 int irq = platform_get_irq(pdev, i);
770
771 if (irq < 0)
772 continue;
773 irq_set_chained_handler_and_data(irq, mvebu_gpio_irq_handler,
774 mvchip);
775 }
776
777 mvchip->irqbase = irq_alloc_descs(-1, 0, ngpios, -1);
778 if (mvchip->irqbase < 0) {
779 dev_err(&pdev->dev, "no irqs\n");
780 return mvchip->irqbase;
781 }
782
783 gc = irq_alloc_generic_chip("mvebu_gpio_irq", 2, mvchip->irqbase,
784 mvchip->membase, handle_level_irq);
785 if (!gc) {
786 dev_err(&pdev->dev, "Cannot allocate generic irq_chip\n");
787 return -ENOMEM;
788 }
789
790 gc->private = mvchip;
791 ct = &gc->chip_types[0];
792 ct->type = IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW;
793 ct->chip.irq_mask = mvebu_gpio_level_irq_mask;
794 ct->chip.irq_unmask = mvebu_gpio_level_irq_unmask;
795 ct->chip.irq_set_type = mvebu_gpio_irq_set_type;
796 ct->chip.name = mvchip->chip.label;
797
798 ct = &gc->chip_types[1];
799 ct->type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
800 ct->chip.irq_ack = mvebu_gpio_irq_ack;
801 ct->chip.irq_mask = mvebu_gpio_edge_irq_mask;
802 ct->chip.irq_unmask = mvebu_gpio_edge_irq_unmask;
803 ct->chip.irq_set_type = mvebu_gpio_irq_set_type;
804 ct->handler = handle_edge_irq;
805 ct->chip.name = mvchip->chip.label;
806
807 irq_setup_generic_chip(gc, IRQ_MSK(ngpios), 0,
808 IRQ_NOREQUEST, IRQ_LEVEL | IRQ_NOPROBE);
809
810 /* Setup irq domain on top of the generic chip. */
811 mvchip->domain = irq_domain_add_simple(np, mvchip->chip.ngpio,
812 mvchip->irqbase,
813 &irq_domain_simple_ops,
814 mvchip);
815 if (!mvchip->domain) {
816 dev_err(&pdev->dev, "couldn't allocate irq domain %s (DT).\n",
817 mvchip->chip.label);
818 err = -ENODEV;
819 goto err_generic_chip;
820 }
821
822 return 0;
823
824err_generic_chip:
825 irq_remove_generic_chip(gc, IRQ_MSK(ngpios), IRQ_NOREQUEST,
826 IRQ_LEVEL | IRQ_NOPROBE);
827 kfree(gc);
828
829 return err;
830}
831
832static struct platform_driver mvebu_gpio_driver = {
833 .driver = {
834 .name = "mvebu-gpio",
835 .of_match_table = mvebu_gpio_of_match,
836 },
837 .probe = mvebu_gpio_probe,
838 .suspend = mvebu_gpio_suspend,
839 .resume = mvebu_gpio_resume,
840};
841module_platform_driver(mvebu_gpio_driver);