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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Support functions for OMAP GPIO
4 *
5 * Copyright (C) 2003-2005 Nokia Corporation
6 * Written by Juha Yrjölä <juha.yrjola@nokia.com>
7 *
8 * Copyright (C) 2009 Texas Instruments
9 * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
10 */
11
12#include <linux/init.h>
13#include <linux/module.h>
14#include <linux/interrupt.h>
15#include <linux/seq_file.h>
16#include <linux/syscore_ops.h>
17#include <linux/err.h>
18#include <linux/clk.h>
19#include <linux/io.h>
20#include <linux/cpu_pm.h>
21#include <linux/device.h>
22#include <linux/pm_runtime.h>
23#include <linux/pm.h>
24#include <linux/of.h>
25#include <linux/gpio/driver.h>
26#include <linux/bitops.h>
27#include <linux/platform_data/gpio-omap.h>
28
29#define OMAP4_GPIO_DEBOUNCINGTIME_MASK 0xFF
30
31struct gpio_regs {
32 u32 sysconfig;
33 u32 irqenable1;
34 u32 irqenable2;
35 u32 wake_en;
36 u32 ctrl;
37 u32 oe;
38 u32 leveldetect0;
39 u32 leveldetect1;
40 u32 risingdetect;
41 u32 fallingdetect;
42 u32 dataout;
43 u32 debounce;
44 u32 debounce_en;
45};
46
47struct gpio_bank {
48 void __iomem *base;
49 const struct omap_gpio_reg_offs *regs;
50 struct device *dev;
51
52 int irq;
53 u32 non_wakeup_gpios;
54 u32 enabled_non_wakeup_gpios;
55 struct gpio_regs context;
56 u32 saved_datain;
57 u32 level_mask;
58 u32 toggle_mask;
59 raw_spinlock_t lock;
60 raw_spinlock_t wa_lock;
61 struct gpio_chip chip;
62 struct clk *dbck;
63 struct notifier_block nb;
64 unsigned int is_suspended:1;
65 unsigned int needs_resume:1;
66 u32 mod_usage;
67 u32 irq_usage;
68 u32 dbck_enable_mask;
69 bool dbck_enabled;
70 bool is_mpuio;
71 bool dbck_flag;
72 bool loses_context;
73 bool context_valid;
74 int stride;
75 u32 width;
76 int context_loss_count;
77
78 void (*set_dataout)(struct gpio_bank *bank, unsigned gpio, int enable);
79 int (*get_context_loss_count)(struct device *dev);
80};
81
82#define GPIO_MOD_CTRL_BIT BIT(0)
83
84#define BANK_USED(bank) (bank->mod_usage || bank->irq_usage)
85#define LINE_USED(line, offset) (line & (BIT(offset)))
86
87static void omap_gpio_unmask_irq(struct irq_data *d);
88
89static inline struct gpio_bank *omap_irq_data_get_bank(struct irq_data *d)
90{
91 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
92 return gpiochip_get_data(chip);
93}
94
95static inline u32 omap_gpio_rmw(void __iomem *reg, u32 mask, bool set)
96{
97 u32 val = readl_relaxed(reg);
98
99 if (set)
100 val |= mask;
101 else
102 val &= ~mask;
103
104 writel_relaxed(val, reg);
105
106 return val;
107}
108
109static void omap_set_gpio_direction(struct gpio_bank *bank, int gpio,
110 int is_input)
111{
112 bank->context.oe = omap_gpio_rmw(bank->base + bank->regs->direction,
113 BIT(gpio), is_input);
114}
115
116
117/* set data out value using dedicate set/clear register */
118static void omap_set_gpio_dataout_reg(struct gpio_bank *bank, unsigned offset,
119 int enable)
120{
121 void __iomem *reg = bank->base;
122 u32 l = BIT(offset);
123
124 if (enable) {
125 reg += bank->regs->set_dataout;
126 bank->context.dataout |= l;
127 } else {
128 reg += bank->regs->clr_dataout;
129 bank->context.dataout &= ~l;
130 }
131
132 writel_relaxed(l, reg);
133}
134
135/* set data out value using mask register */
136static void omap_set_gpio_dataout_mask(struct gpio_bank *bank, unsigned offset,
137 int enable)
138{
139 bank->context.dataout = omap_gpio_rmw(bank->base + bank->regs->dataout,
140 BIT(offset), enable);
141}
142
143static inline void omap_gpio_dbck_enable(struct gpio_bank *bank)
144{
145 if (bank->dbck_enable_mask && !bank->dbck_enabled) {
146 clk_enable(bank->dbck);
147 bank->dbck_enabled = true;
148
149 writel_relaxed(bank->dbck_enable_mask,
150 bank->base + bank->regs->debounce_en);
151 }
152}
153
154static inline void omap_gpio_dbck_disable(struct gpio_bank *bank)
155{
156 if (bank->dbck_enable_mask && bank->dbck_enabled) {
157 /*
158 * Disable debounce before cutting it's clock. If debounce is
159 * enabled but the clock is not, GPIO module seems to be unable
160 * to detect events and generate interrupts at least on OMAP3.
161 */
162 writel_relaxed(0, bank->base + bank->regs->debounce_en);
163
164 clk_disable(bank->dbck);
165 bank->dbck_enabled = false;
166 }
167}
168
169/**
170 * omap2_set_gpio_debounce - low level gpio debounce time
171 * @bank: the gpio bank we're acting upon
172 * @offset: the gpio number on this @bank
173 * @debounce: debounce time to use
174 *
175 * OMAP's debounce time is in 31us steps
176 * <debounce time> = (GPIO_DEBOUNCINGTIME[7:0].DEBOUNCETIME + 1) x 31
177 * so we need to convert and round up to the closest unit.
178 *
179 * Return: 0 on success, negative error otherwise.
180 */
181static int omap2_set_gpio_debounce(struct gpio_bank *bank, unsigned offset,
182 unsigned debounce)
183{
184 u32 val;
185 u32 l;
186 bool enable = !!debounce;
187
188 if (!bank->dbck_flag)
189 return -ENOTSUPP;
190
191 if (enable) {
192 debounce = DIV_ROUND_UP(debounce, 31) - 1;
193 if ((debounce & OMAP4_GPIO_DEBOUNCINGTIME_MASK) != debounce)
194 return -EINVAL;
195 }
196
197 l = BIT(offset);
198
199 clk_enable(bank->dbck);
200 writel_relaxed(debounce, bank->base + bank->regs->debounce);
201
202 val = omap_gpio_rmw(bank->base + bank->regs->debounce_en, l, enable);
203 bank->dbck_enable_mask = val;
204
205 clk_disable(bank->dbck);
206 /*
207 * Enable debounce clock per module.
208 * This call is mandatory because in omap_gpio_request() when
209 * *_runtime_get_sync() is called, _gpio_dbck_enable() within
210 * runtime callbck fails to turn on dbck because dbck_enable_mask
211 * used within _gpio_dbck_enable() is still not initialized at
212 * that point. Therefore we have to enable dbck here.
213 */
214 omap_gpio_dbck_enable(bank);
215 if (bank->dbck_enable_mask) {
216 bank->context.debounce = debounce;
217 bank->context.debounce_en = val;
218 }
219
220 return 0;
221}
222
223/**
224 * omap_clear_gpio_debounce - clear debounce settings for a gpio
225 * @bank: the gpio bank we're acting upon
226 * @offset: the gpio number on this @bank
227 *
228 * If a gpio is using debounce, then clear the debounce enable bit and if
229 * this is the only gpio in this bank using debounce, then clear the debounce
230 * time too. The debounce clock will also be disabled when calling this function
231 * if this is the only gpio in the bank using debounce.
232 */
233static void omap_clear_gpio_debounce(struct gpio_bank *bank, unsigned offset)
234{
235 u32 gpio_bit = BIT(offset);
236
237 if (!bank->dbck_flag)
238 return;
239
240 if (!(bank->dbck_enable_mask & gpio_bit))
241 return;
242
243 bank->dbck_enable_mask &= ~gpio_bit;
244 bank->context.debounce_en &= ~gpio_bit;
245 writel_relaxed(bank->context.debounce_en,
246 bank->base + bank->regs->debounce_en);
247
248 if (!bank->dbck_enable_mask) {
249 bank->context.debounce = 0;
250 writel_relaxed(bank->context.debounce, bank->base +
251 bank->regs->debounce);
252 clk_disable(bank->dbck);
253 bank->dbck_enabled = false;
254 }
255}
256
257/*
258 * Off mode wake-up capable GPIOs in bank(s) that are in the wakeup domain.
259 * See TRM section for GPIO for "Wake-Up Generation" for the list of GPIOs
260 * in wakeup domain. If bank->non_wakeup_gpios is not configured, assume none
261 * are capable waking up the system from off mode.
262 */
263static bool omap_gpio_is_off_wakeup_capable(struct gpio_bank *bank, u32 gpio_mask)
264{
265 u32 no_wake = bank->non_wakeup_gpios;
266
267 if (no_wake)
268 return !!(~no_wake & gpio_mask);
269
270 return false;
271}
272
273static inline void omap_set_gpio_trigger(struct gpio_bank *bank, int gpio,
274 unsigned trigger)
275{
276 void __iomem *base = bank->base;
277 u32 gpio_bit = BIT(gpio);
278
279 omap_gpio_rmw(base + bank->regs->leveldetect0, gpio_bit,
280 trigger & IRQ_TYPE_LEVEL_LOW);
281 omap_gpio_rmw(base + bank->regs->leveldetect1, gpio_bit,
282 trigger & IRQ_TYPE_LEVEL_HIGH);
283
284 /*
285 * We need the edge detection enabled for to allow the GPIO block
286 * to be woken from idle state. Set the appropriate edge detection
287 * in addition to the level detection.
288 */
289 omap_gpio_rmw(base + bank->regs->risingdetect, gpio_bit,
290 trigger & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_LEVEL_HIGH));
291 omap_gpio_rmw(base + bank->regs->fallingdetect, gpio_bit,
292 trigger & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_LEVEL_LOW));
293
294 bank->context.leveldetect0 =
295 readl_relaxed(bank->base + bank->regs->leveldetect0);
296 bank->context.leveldetect1 =
297 readl_relaxed(bank->base + bank->regs->leveldetect1);
298 bank->context.risingdetect =
299 readl_relaxed(bank->base + bank->regs->risingdetect);
300 bank->context.fallingdetect =
301 readl_relaxed(bank->base + bank->regs->fallingdetect);
302
303 bank->level_mask = bank->context.leveldetect0 |
304 bank->context.leveldetect1;
305
306 /* This part needs to be executed always for OMAP{34xx, 44xx} */
307 if (!bank->regs->irqctrl && !omap_gpio_is_off_wakeup_capable(bank, gpio)) {
308 /*
309 * Log the edge gpio and manually trigger the IRQ
310 * after resume if the input level changes
311 * to avoid irq lost during PER RET/OFF mode
312 * Applies for omap2 non-wakeup gpio and all omap3 gpios
313 */
314 if (trigger & IRQ_TYPE_EDGE_BOTH)
315 bank->enabled_non_wakeup_gpios |= gpio_bit;
316 else
317 bank->enabled_non_wakeup_gpios &= ~gpio_bit;
318 }
319}
320
321/*
322 * This only applies to chips that can't do both rising and falling edge
323 * detection at once. For all other chips, this function is a noop.
324 */
325static void omap_toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio)
326{
327 if (IS_ENABLED(CONFIG_ARCH_OMAP1) && bank->regs->irqctrl) {
328 void __iomem *reg = bank->base + bank->regs->irqctrl;
329
330 writel_relaxed(readl_relaxed(reg) ^ BIT(gpio), reg);
331 }
332}
333
334static int omap_set_gpio_triggering(struct gpio_bank *bank, int gpio,
335 unsigned trigger)
336{
337 void __iomem *reg = bank->base;
338 u32 l = 0;
339
340 if (bank->regs->leveldetect0 && bank->regs->wkup_en) {
341 omap_set_gpio_trigger(bank, gpio, trigger);
342 } else if (bank->regs->irqctrl) {
343 reg += bank->regs->irqctrl;
344
345 l = readl_relaxed(reg);
346 if ((trigger & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH)
347 bank->toggle_mask |= BIT(gpio);
348 if (trigger & IRQ_TYPE_EDGE_RISING)
349 l |= BIT(gpio);
350 else if (trigger & IRQ_TYPE_EDGE_FALLING)
351 l &= ~(BIT(gpio));
352 else
353 return -EINVAL;
354
355 writel_relaxed(l, reg);
356 } else if (bank->regs->edgectrl1) {
357 if (gpio & 0x08)
358 reg += bank->regs->edgectrl2;
359 else
360 reg += bank->regs->edgectrl1;
361
362 gpio &= 0x07;
363 l = readl_relaxed(reg);
364 l &= ~(3 << (gpio << 1));
365 if (trigger & IRQ_TYPE_EDGE_RISING)
366 l |= 2 << (gpio << 1);
367 if (trigger & IRQ_TYPE_EDGE_FALLING)
368 l |= BIT(gpio << 1);
369 writel_relaxed(l, reg);
370 }
371 return 0;
372}
373
374static void omap_enable_gpio_module(struct gpio_bank *bank, unsigned offset)
375{
376 if (bank->regs->pinctrl) {
377 void __iomem *reg = bank->base + bank->regs->pinctrl;
378
379 /* Claim the pin for MPU */
380 writel_relaxed(readl_relaxed(reg) | (BIT(offset)), reg);
381 }
382
383 if (bank->regs->ctrl && !BANK_USED(bank)) {
384 void __iomem *reg = bank->base + bank->regs->ctrl;
385 u32 ctrl;
386
387 ctrl = readl_relaxed(reg);
388 /* Module is enabled, clocks are not gated */
389 ctrl &= ~GPIO_MOD_CTRL_BIT;
390 writel_relaxed(ctrl, reg);
391 bank->context.ctrl = ctrl;
392 }
393}
394
395static void omap_disable_gpio_module(struct gpio_bank *bank, unsigned offset)
396{
397 if (bank->regs->ctrl && !BANK_USED(bank)) {
398 void __iomem *reg = bank->base + bank->regs->ctrl;
399 u32 ctrl;
400
401 ctrl = readl_relaxed(reg);
402 /* Module is disabled, clocks are gated */
403 ctrl |= GPIO_MOD_CTRL_BIT;
404 writel_relaxed(ctrl, reg);
405 bank->context.ctrl = ctrl;
406 }
407}
408
409static int omap_gpio_is_input(struct gpio_bank *bank, unsigned offset)
410{
411 void __iomem *reg = bank->base + bank->regs->direction;
412
413 return readl_relaxed(reg) & BIT(offset);
414}
415
416static void omap_gpio_init_irq(struct gpio_bank *bank, unsigned offset)
417{
418 if (!LINE_USED(bank->mod_usage, offset)) {
419 omap_enable_gpio_module(bank, offset);
420 omap_set_gpio_direction(bank, offset, 1);
421 }
422 bank->irq_usage |= BIT(offset);
423}
424
425static int omap_gpio_irq_type(struct irq_data *d, unsigned type)
426{
427 struct gpio_bank *bank = omap_irq_data_get_bank(d);
428 int retval;
429 unsigned long flags;
430 unsigned offset = d->hwirq;
431
432 if (type & ~IRQ_TYPE_SENSE_MASK)
433 return -EINVAL;
434
435 if (!bank->regs->leveldetect0 &&
436 (type & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH)))
437 return -EINVAL;
438
439 raw_spin_lock_irqsave(&bank->lock, flags);
440 retval = omap_set_gpio_triggering(bank, offset, type);
441 if (retval) {
442 raw_spin_unlock_irqrestore(&bank->lock, flags);
443 goto error;
444 }
445 omap_gpio_init_irq(bank, offset);
446 if (!omap_gpio_is_input(bank, offset)) {
447 raw_spin_unlock_irqrestore(&bank->lock, flags);
448 retval = -EINVAL;
449 goto error;
450 }
451 raw_spin_unlock_irqrestore(&bank->lock, flags);
452
453 if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
454 irq_set_handler_locked(d, handle_level_irq);
455 else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
456 /*
457 * Edge IRQs are already cleared/acked in irq_handler and
458 * not need to be masked, as result handle_edge_irq()
459 * logic is excessed here and may cause lose of interrupts.
460 * So just use handle_simple_irq.
461 */
462 irq_set_handler_locked(d, handle_simple_irq);
463
464 return 0;
465
466error:
467 return retval;
468}
469
470static void omap_clear_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
471{
472 void __iomem *reg = bank->base;
473
474 reg += bank->regs->irqstatus;
475 writel_relaxed(gpio_mask, reg);
476
477 /* Workaround for clearing DSP GPIO interrupts to allow retention */
478 if (bank->regs->irqstatus2) {
479 reg = bank->base + bank->regs->irqstatus2;
480 writel_relaxed(gpio_mask, reg);
481 }
482
483 /* Flush posted write for the irq status to avoid spurious interrupts */
484 readl_relaxed(reg);
485}
486
487static inline void omap_clear_gpio_irqstatus(struct gpio_bank *bank,
488 unsigned offset)
489{
490 omap_clear_gpio_irqbank(bank, BIT(offset));
491}
492
493static u32 omap_get_gpio_irqbank_mask(struct gpio_bank *bank)
494{
495 void __iomem *reg = bank->base;
496 u32 l;
497 u32 mask = (BIT(bank->width)) - 1;
498
499 reg += bank->regs->irqenable;
500 l = readl_relaxed(reg);
501 if (bank->regs->irqenable_inv)
502 l = ~l;
503 l &= mask;
504 return l;
505}
506
507static inline void omap_set_gpio_irqenable(struct gpio_bank *bank,
508 unsigned offset, int enable)
509{
510 void __iomem *reg = bank->base;
511 u32 gpio_mask = BIT(offset);
512
513 if (bank->regs->set_irqenable && bank->regs->clr_irqenable) {
514 if (enable) {
515 reg += bank->regs->set_irqenable;
516 bank->context.irqenable1 |= gpio_mask;
517 } else {
518 reg += bank->regs->clr_irqenable;
519 bank->context.irqenable1 &= ~gpio_mask;
520 }
521 writel_relaxed(gpio_mask, reg);
522 } else {
523 bank->context.irqenable1 =
524 omap_gpio_rmw(reg + bank->regs->irqenable, gpio_mask,
525 enable ^ bank->regs->irqenable_inv);
526 }
527
528 /*
529 * Program GPIO wakeup along with IRQ enable to satisfy OMAP4430 TRM
530 * note requiring correlation between the IRQ enable registers and
531 * the wakeup registers. In any case, we want wakeup from idle
532 * enabled for the GPIOs which support this feature.
533 */
534 if (bank->regs->wkup_en &&
535 (bank->regs->edgectrl1 || !(bank->non_wakeup_gpios & gpio_mask))) {
536 bank->context.wake_en =
537 omap_gpio_rmw(bank->base + bank->regs->wkup_en,
538 gpio_mask, enable);
539 }
540}
541
542/* Use disable_irq_wake() and enable_irq_wake() functions from drivers */
543static int omap_gpio_wake_enable(struct irq_data *d, unsigned int enable)
544{
545 struct gpio_bank *bank = omap_irq_data_get_bank(d);
546
547 return irq_set_irq_wake(bank->irq, enable);
548}
549
550/*
551 * We need to unmask the GPIO bank interrupt as soon as possible to
552 * avoid missing GPIO interrupts for other lines in the bank.
553 * Then we need to mask-read-clear-unmask the triggered GPIO lines
554 * in the bank to avoid missing nested interrupts for a GPIO line.
555 * If we wait to unmask individual GPIO lines in the bank after the
556 * line's interrupt handler has been run, we may miss some nested
557 * interrupts.
558 */
559static irqreturn_t omap_gpio_irq_handler(int irq, void *gpiobank)
560{
561 void __iomem *isr_reg = NULL;
562 u32 enabled, isr, edge;
563 unsigned int bit;
564 struct gpio_bank *bank = gpiobank;
565 unsigned long wa_lock_flags;
566 unsigned long lock_flags;
567
568 isr_reg = bank->base + bank->regs->irqstatus;
569 if (WARN_ON(!isr_reg))
570 goto exit;
571
572 if (WARN_ONCE(!pm_runtime_active(bank->chip.parent),
573 "gpio irq%i while runtime suspended?\n", irq))
574 return IRQ_NONE;
575
576 while (1) {
577 raw_spin_lock_irqsave(&bank->lock, lock_flags);
578
579 enabled = omap_get_gpio_irqbank_mask(bank);
580 isr = readl_relaxed(isr_reg) & enabled;
581
582 /*
583 * Clear edge sensitive interrupts before calling handler(s)
584 * so subsequent edge transitions are not missed while the
585 * handlers are running.
586 */
587 edge = isr & ~bank->level_mask;
588 if (edge)
589 omap_clear_gpio_irqbank(bank, edge);
590
591 raw_spin_unlock_irqrestore(&bank->lock, lock_flags);
592
593 if (!isr)
594 break;
595
596 while (isr) {
597 bit = __ffs(isr);
598 isr &= ~(BIT(bit));
599
600 raw_spin_lock_irqsave(&bank->lock, lock_flags);
601 /*
602 * Some chips can't respond to both rising and falling
603 * at the same time. If this irq was requested with
604 * both flags, we need to flip the ICR data for the IRQ
605 * to respond to the IRQ for the opposite direction.
606 * This will be indicated in the bank toggle_mask.
607 */
608 if (bank->toggle_mask & (BIT(bit)))
609 omap_toggle_gpio_edge_triggering(bank, bit);
610
611 raw_spin_unlock_irqrestore(&bank->lock, lock_flags);
612
613 raw_spin_lock_irqsave(&bank->wa_lock, wa_lock_flags);
614
615 generic_handle_domain_irq(bank->chip.irq.domain, bit);
616
617 raw_spin_unlock_irqrestore(&bank->wa_lock,
618 wa_lock_flags);
619 }
620 }
621exit:
622 return IRQ_HANDLED;
623}
624
625static unsigned int omap_gpio_irq_startup(struct irq_data *d)
626{
627 struct gpio_bank *bank = omap_irq_data_get_bank(d);
628 unsigned long flags;
629 unsigned offset = d->hwirq;
630
631 raw_spin_lock_irqsave(&bank->lock, flags);
632
633 if (!LINE_USED(bank->mod_usage, offset))
634 omap_set_gpio_direction(bank, offset, 1);
635 omap_enable_gpio_module(bank, offset);
636 bank->irq_usage |= BIT(offset);
637
638 raw_spin_unlock_irqrestore(&bank->lock, flags);
639 omap_gpio_unmask_irq(d);
640
641 return 0;
642}
643
644static void omap_gpio_irq_shutdown(struct irq_data *d)
645{
646 struct gpio_bank *bank = omap_irq_data_get_bank(d);
647 unsigned long flags;
648 unsigned offset = d->hwirq;
649
650 raw_spin_lock_irqsave(&bank->lock, flags);
651 bank->irq_usage &= ~(BIT(offset));
652 omap_set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);
653 omap_clear_gpio_irqstatus(bank, offset);
654 omap_set_gpio_irqenable(bank, offset, 0);
655 if (!LINE_USED(bank->mod_usage, offset))
656 omap_clear_gpio_debounce(bank, offset);
657 omap_disable_gpio_module(bank, offset);
658 raw_spin_unlock_irqrestore(&bank->lock, flags);
659}
660
661static void omap_gpio_irq_bus_lock(struct irq_data *data)
662{
663 struct gpio_bank *bank = omap_irq_data_get_bank(data);
664
665 pm_runtime_get_sync(bank->chip.parent);
666}
667
668static void gpio_irq_bus_sync_unlock(struct irq_data *data)
669{
670 struct gpio_bank *bank = omap_irq_data_get_bank(data);
671
672 pm_runtime_put(bank->chip.parent);
673}
674
675static void omap_gpio_mask_irq(struct irq_data *d)
676{
677 struct gpio_bank *bank = omap_irq_data_get_bank(d);
678 unsigned offset = d->hwirq;
679 unsigned long flags;
680
681 raw_spin_lock_irqsave(&bank->lock, flags);
682 omap_set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);
683 omap_set_gpio_irqenable(bank, offset, 0);
684 raw_spin_unlock_irqrestore(&bank->lock, flags);
685 gpiochip_disable_irq(&bank->chip, offset);
686}
687
688static void omap_gpio_unmask_irq(struct irq_data *d)
689{
690 struct gpio_bank *bank = omap_irq_data_get_bank(d);
691 unsigned offset = d->hwirq;
692 u32 trigger = irqd_get_trigger_type(d);
693 unsigned long flags;
694
695 gpiochip_enable_irq(&bank->chip, offset);
696 raw_spin_lock_irqsave(&bank->lock, flags);
697 omap_set_gpio_irqenable(bank, offset, 1);
698
699 /*
700 * For level-triggered GPIOs, clearing must be done after the source
701 * is cleared, thus after the handler has run. OMAP4 needs this done
702 * after enabing the interrupt to clear the wakeup status.
703 */
704 if (bank->regs->leveldetect0 && bank->regs->wkup_en &&
705 trigger & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
706 omap_clear_gpio_irqstatus(bank, offset);
707
708 if (trigger)
709 omap_set_gpio_triggering(bank, offset, trigger);
710
711 raw_spin_unlock_irqrestore(&bank->lock, flags);
712}
713
714static void omap_gpio_irq_print_chip(struct irq_data *d, struct seq_file *p)
715{
716 struct gpio_bank *bank = omap_irq_data_get_bank(d);
717
718 seq_printf(p, dev_name(bank->dev));
719}
720
721static const struct irq_chip omap_gpio_irq_chip = {
722 .irq_startup = omap_gpio_irq_startup,
723 .irq_shutdown = omap_gpio_irq_shutdown,
724 .irq_mask = omap_gpio_mask_irq,
725 .irq_unmask = omap_gpio_unmask_irq,
726 .irq_set_type = omap_gpio_irq_type,
727 .irq_set_wake = omap_gpio_wake_enable,
728 .irq_bus_lock = omap_gpio_irq_bus_lock,
729 .irq_bus_sync_unlock = gpio_irq_bus_sync_unlock,
730 .irq_print_chip = omap_gpio_irq_print_chip,
731 .flags = IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_IMMUTABLE,
732 GPIOCHIP_IRQ_RESOURCE_HELPERS,
733};
734
735static const struct irq_chip omap_gpio_irq_chip_nowake = {
736 .irq_startup = omap_gpio_irq_startup,
737 .irq_shutdown = omap_gpio_irq_shutdown,
738 .irq_mask = omap_gpio_mask_irq,
739 .irq_unmask = omap_gpio_unmask_irq,
740 .irq_set_type = omap_gpio_irq_type,
741 .irq_bus_lock = omap_gpio_irq_bus_lock,
742 .irq_bus_sync_unlock = gpio_irq_bus_sync_unlock,
743 .irq_print_chip = omap_gpio_irq_print_chip,
744 .flags = IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_IMMUTABLE,
745 GPIOCHIP_IRQ_RESOURCE_HELPERS,
746};
747
748/*---------------------------------------------------------------------*/
749
750static int omap_mpuio_suspend_noirq(struct device *dev)
751{
752 struct gpio_bank *bank = dev_get_drvdata(dev);
753 void __iomem *mask_reg = bank->base +
754 OMAP_MPUIO_GPIO_MASKIT / bank->stride;
755 unsigned long flags;
756
757 raw_spin_lock_irqsave(&bank->lock, flags);
758 writel_relaxed(0xffff & ~bank->context.wake_en, mask_reg);
759 raw_spin_unlock_irqrestore(&bank->lock, flags);
760
761 return 0;
762}
763
764static int omap_mpuio_resume_noirq(struct device *dev)
765{
766 struct gpio_bank *bank = dev_get_drvdata(dev);
767 void __iomem *mask_reg = bank->base +
768 OMAP_MPUIO_GPIO_MASKIT / bank->stride;
769 unsigned long flags;
770
771 raw_spin_lock_irqsave(&bank->lock, flags);
772 writel_relaxed(bank->context.wake_en, mask_reg);
773 raw_spin_unlock_irqrestore(&bank->lock, flags);
774
775 return 0;
776}
777
778static const struct dev_pm_ops omap_mpuio_dev_pm_ops = {
779 .suspend_noirq = omap_mpuio_suspend_noirq,
780 .resume_noirq = omap_mpuio_resume_noirq,
781};
782
783/* use platform_driver for this. */
784static struct platform_driver omap_mpuio_driver = {
785 .driver = {
786 .name = "mpuio",
787 .pm = &omap_mpuio_dev_pm_ops,
788 },
789};
790
791static struct platform_device omap_mpuio_device = {
792 .name = "mpuio",
793 .id = -1,
794 .dev = {
795 .driver = &omap_mpuio_driver.driver,
796 }
797 /* could list the /proc/iomem resources */
798};
799
800static inline void omap_mpuio_init(struct gpio_bank *bank)
801{
802 platform_set_drvdata(&omap_mpuio_device, bank);
803
804 if (platform_driver_register(&omap_mpuio_driver) == 0)
805 (void) platform_device_register(&omap_mpuio_device);
806}
807
808/*---------------------------------------------------------------------*/
809
810static int omap_gpio_request(struct gpio_chip *chip, unsigned offset)
811{
812 struct gpio_bank *bank = gpiochip_get_data(chip);
813 unsigned long flags;
814
815 pm_runtime_get_sync(chip->parent);
816
817 raw_spin_lock_irqsave(&bank->lock, flags);
818 omap_enable_gpio_module(bank, offset);
819 bank->mod_usage |= BIT(offset);
820 raw_spin_unlock_irqrestore(&bank->lock, flags);
821
822 return 0;
823}
824
825static void omap_gpio_free(struct gpio_chip *chip, unsigned offset)
826{
827 struct gpio_bank *bank = gpiochip_get_data(chip);
828 unsigned long flags;
829
830 raw_spin_lock_irqsave(&bank->lock, flags);
831 bank->mod_usage &= ~(BIT(offset));
832 if (!LINE_USED(bank->irq_usage, offset)) {
833 omap_set_gpio_direction(bank, offset, 1);
834 omap_clear_gpio_debounce(bank, offset);
835 }
836 omap_disable_gpio_module(bank, offset);
837 raw_spin_unlock_irqrestore(&bank->lock, flags);
838
839 pm_runtime_put(chip->parent);
840}
841
842static int omap_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
843{
844 struct gpio_bank *bank = gpiochip_get_data(chip);
845
846 if (readl_relaxed(bank->base + bank->regs->direction) & BIT(offset))
847 return GPIO_LINE_DIRECTION_IN;
848
849 return GPIO_LINE_DIRECTION_OUT;
850}
851
852static int omap_gpio_input(struct gpio_chip *chip, unsigned offset)
853{
854 struct gpio_bank *bank;
855 unsigned long flags;
856
857 bank = gpiochip_get_data(chip);
858 raw_spin_lock_irqsave(&bank->lock, flags);
859 omap_set_gpio_direction(bank, offset, 1);
860 raw_spin_unlock_irqrestore(&bank->lock, flags);
861 return 0;
862}
863
864static int omap_gpio_get(struct gpio_chip *chip, unsigned offset)
865{
866 struct gpio_bank *bank = gpiochip_get_data(chip);
867 void __iomem *reg;
868
869 if (omap_gpio_is_input(bank, offset))
870 reg = bank->base + bank->regs->datain;
871 else
872 reg = bank->base + bank->regs->dataout;
873
874 return (readl_relaxed(reg) & BIT(offset)) != 0;
875}
876
877static int omap_gpio_output(struct gpio_chip *chip, unsigned offset, int value)
878{
879 struct gpio_bank *bank;
880 unsigned long flags;
881
882 bank = gpiochip_get_data(chip);
883 raw_spin_lock_irqsave(&bank->lock, flags);
884 bank->set_dataout(bank, offset, value);
885 omap_set_gpio_direction(bank, offset, 0);
886 raw_spin_unlock_irqrestore(&bank->lock, flags);
887 return 0;
888}
889
890static int omap_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,
891 unsigned long *bits)
892{
893 struct gpio_bank *bank = gpiochip_get_data(chip);
894 void __iomem *base = bank->base;
895 u32 direction, m, val = 0;
896
897 direction = readl_relaxed(base + bank->regs->direction);
898
899 m = direction & *mask;
900 if (m)
901 val |= readl_relaxed(base + bank->regs->datain) & m;
902
903 m = ~direction & *mask;
904 if (m)
905 val |= readl_relaxed(base + bank->regs->dataout) & m;
906
907 *bits = val;
908
909 return 0;
910}
911
912static int omap_gpio_debounce(struct gpio_chip *chip, unsigned offset,
913 unsigned debounce)
914{
915 struct gpio_bank *bank;
916 unsigned long flags;
917 int ret;
918
919 bank = gpiochip_get_data(chip);
920
921 raw_spin_lock_irqsave(&bank->lock, flags);
922 ret = omap2_set_gpio_debounce(bank, offset, debounce);
923 raw_spin_unlock_irqrestore(&bank->lock, flags);
924
925 if (ret)
926 dev_info(chip->parent,
927 "Could not set line %u debounce to %u microseconds (%d)",
928 offset, debounce, ret);
929
930 return ret;
931}
932
933static int omap_gpio_set_config(struct gpio_chip *chip, unsigned offset,
934 unsigned long config)
935{
936 u32 debounce;
937 int ret = -ENOTSUPP;
938
939 switch (pinconf_to_config_param(config)) {
940 case PIN_CONFIG_BIAS_DISABLE:
941 case PIN_CONFIG_BIAS_PULL_UP:
942 case PIN_CONFIG_BIAS_PULL_DOWN:
943 ret = gpiochip_generic_config(chip, offset, config);
944 break;
945 case PIN_CONFIG_INPUT_DEBOUNCE:
946 debounce = pinconf_to_config_argument(config);
947 ret = omap_gpio_debounce(chip, offset, debounce);
948 break;
949 default:
950 break;
951 }
952
953 return ret;
954}
955
956static void omap_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
957{
958 struct gpio_bank *bank;
959 unsigned long flags;
960
961 bank = gpiochip_get_data(chip);
962 raw_spin_lock_irqsave(&bank->lock, flags);
963 bank->set_dataout(bank, offset, value);
964 raw_spin_unlock_irqrestore(&bank->lock, flags);
965}
966
967static void omap_gpio_set_multiple(struct gpio_chip *chip, unsigned long *mask,
968 unsigned long *bits)
969{
970 struct gpio_bank *bank = gpiochip_get_data(chip);
971 void __iomem *reg = bank->base + bank->regs->dataout;
972 unsigned long flags;
973 u32 l;
974
975 raw_spin_lock_irqsave(&bank->lock, flags);
976 l = (readl_relaxed(reg) & ~*mask) | (*bits & *mask);
977 writel_relaxed(l, reg);
978 bank->context.dataout = l;
979 raw_spin_unlock_irqrestore(&bank->lock, flags);
980}
981
982/*---------------------------------------------------------------------*/
983
984static void omap_gpio_show_rev(struct gpio_bank *bank)
985{
986 static bool called;
987 u32 rev;
988
989 if (called || bank->regs->revision == USHRT_MAX)
990 return;
991
992 rev = readw_relaxed(bank->base + bank->regs->revision);
993 pr_info("OMAP GPIO hardware version %d.%d\n",
994 (rev >> 4) & 0x0f, rev & 0x0f);
995
996 called = true;
997}
998
999static void omap_gpio_mod_init(struct gpio_bank *bank)
1000{
1001 void __iomem *base = bank->base;
1002 u32 l = 0xffffffff;
1003
1004 if (bank->width == 16)
1005 l = 0xffff;
1006
1007 if (bank->is_mpuio) {
1008 writel_relaxed(l, bank->base + bank->regs->irqenable);
1009 return;
1010 }
1011
1012 omap_gpio_rmw(base + bank->regs->irqenable, l,
1013 bank->regs->irqenable_inv);
1014 omap_gpio_rmw(base + bank->regs->irqstatus, l,
1015 !bank->regs->irqenable_inv);
1016 if (bank->regs->debounce_en)
1017 writel_relaxed(0, base + bank->regs->debounce_en);
1018
1019 /* Save OE default value (0xffffffff) in the context */
1020 bank->context.oe = readl_relaxed(bank->base + bank->regs->direction);
1021 /* Initialize interface clk ungated, module enabled */
1022 if (bank->regs->ctrl)
1023 writel_relaxed(0, base + bank->regs->ctrl);
1024}
1025
1026static int omap_gpio_chip_init(struct gpio_bank *bank, struct device *pm_dev)
1027{
1028 struct gpio_irq_chip *irq;
1029 static int gpio;
1030 const char *label;
1031 int ret;
1032
1033 /*
1034 * REVISIT eventually switch from OMAP-specific gpio structs
1035 * over to the generic ones
1036 */
1037 bank->chip.request = omap_gpio_request;
1038 bank->chip.free = omap_gpio_free;
1039 bank->chip.get_direction = omap_gpio_get_direction;
1040 bank->chip.direction_input = omap_gpio_input;
1041 bank->chip.get = omap_gpio_get;
1042 bank->chip.get_multiple = omap_gpio_get_multiple;
1043 bank->chip.direction_output = omap_gpio_output;
1044 bank->chip.set_config = omap_gpio_set_config;
1045 bank->chip.set = omap_gpio_set;
1046 bank->chip.set_multiple = omap_gpio_set_multiple;
1047 if (bank->is_mpuio) {
1048 bank->chip.label = "mpuio";
1049 if (bank->regs->wkup_en)
1050 bank->chip.parent = &omap_mpuio_device.dev;
1051 } else {
1052 label = devm_kasprintf(bank->chip.parent, GFP_KERNEL, "gpio-%d-%d",
1053 gpio, gpio + bank->width - 1);
1054 if (!label)
1055 return -ENOMEM;
1056 bank->chip.label = label;
1057 }
1058 bank->chip.base = -1;
1059 bank->chip.ngpio = bank->width;
1060
1061 irq = &bank->chip.irq;
1062 /* MPUIO is a bit different, reading IRQ status clears it */
1063 if (bank->is_mpuio && !bank->regs->wkup_en)
1064 gpio_irq_chip_set_chip(irq, &omap_gpio_irq_chip_nowake);
1065 else
1066 gpio_irq_chip_set_chip(irq, &omap_gpio_irq_chip);
1067 irq->handler = handle_bad_irq;
1068 irq->default_type = IRQ_TYPE_NONE;
1069 irq->num_parents = 1;
1070 irq->parents = &bank->irq;
1071
1072 ret = gpiochip_add_data(&bank->chip, bank);
1073 if (ret)
1074 return dev_err_probe(bank->chip.parent, ret, "Could not register gpio chip\n");
1075
1076 irq_domain_set_pm_device(bank->chip.irq.domain, pm_dev);
1077 ret = devm_request_irq(bank->chip.parent, bank->irq,
1078 omap_gpio_irq_handler,
1079 0, dev_name(bank->chip.parent), bank);
1080 if (ret)
1081 gpiochip_remove(&bank->chip);
1082
1083 if (!bank->is_mpuio)
1084 gpio += bank->width;
1085
1086 return ret;
1087}
1088
1089static void omap_gpio_init_context(struct gpio_bank *p)
1090{
1091 const struct omap_gpio_reg_offs *regs = p->regs;
1092 void __iomem *base = p->base;
1093
1094 p->context.sysconfig = readl_relaxed(base + regs->sysconfig);
1095 p->context.ctrl = readl_relaxed(base + regs->ctrl);
1096 p->context.oe = readl_relaxed(base + regs->direction);
1097 p->context.wake_en = readl_relaxed(base + regs->wkup_en);
1098 p->context.leveldetect0 = readl_relaxed(base + regs->leveldetect0);
1099 p->context.leveldetect1 = readl_relaxed(base + regs->leveldetect1);
1100 p->context.risingdetect = readl_relaxed(base + regs->risingdetect);
1101 p->context.fallingdetect = readl_relaxed(base + regs->fallingdetect);
1102 p->context.irqenable1 = readl_relaxed(base + regs->irqenable);
1103 p->context.irqenable2 = readl_relaxed(base + regs->irqenable2);
1104 p->context.dataout = readl_relaxed(base + regs->dataout);
1105
1106 p->context_valid = true;
1107}
1108
1109static void omap_gpio_restore_context(struct gpio_bank *bank)
1110{
1111 const struct omap_gpio_reg_offs *regs = bank->regs;
1112 void __iomem *base = bank->base;
1113
1114 writel_relaxed(bank->context.sysconfig, base + regs->sysconfig);
1115 writel_relaxed(bank->context.wake_en, base + regs->wkup_en);
1116 writel_relaxed(bank->context.ctrl, base + regs->ctrl);
1117 writel_relaxed(bank->context.leveldetect0, base + regs->leveldetect0);
1118 writel_relaxed(bank->context.leveldetect1, base + regs->leveldetect1);
1119 writel_relaxed(bank->context.risingdetect, base + regs->risingdetect);
1120 writel_relaxed(bank->context.fallingdetect, base + regs->fallingdetect);
1121 writel_relaxed(bank->context.dataout, base + regs->dataout);
1122 writel_relaxed(bank->context.oe, base + regs->direction);
1123
1124 if (bank->dbck_enable_mask) {
1125 writel_relaxed(bank->context.debounce, base + regs->debounce);
1126 writel_relaxed(bank->context.debounce_en,
1127 base + regs->debounce_en);
1128 }
1129
1130 writel_relaxed(bank->context.irqenable1, base + regs->irqenable);
1131 writel_relaxed(bank->context.irqenable2, base + regs->irqenable2);
1132}
1133
1134static void omap_gpio_idle(struct gpio_bank *bank, bool may_lose_context)
1135{
1136 struct device *dev = bank->chip.parent;
1137 void __iomem *base = bank->base;
1138 u32 mask, nowake;
1139
1140 bank->saved_datain = readl_relaxed(base + bank->regs->datain);
1141
1142 /* Save syconfig, it's runtime value can be different from init value */
1143 if (bank->loses_context)
1144 bank->context.sysconfig = readl_relaxed(base + bank->regs->sysconfig);
1145
1146 if (!bank->enabled_non_wakeup_gpios)
1147 goto update_gpio_context_count;
1148
1149 /* Check for pending EDGE_FALLING, ignore EDGE_BOTH */
1150 mask = bank->enabled_non_wakeup_gpios & bank->context.fallingdetect;
1151 mask &= ~bank->context.risingdetect;
1152 bank->saved_datain |= mask;
1153
1154 /* Check for pending EDGE_RISING, ignore EDGE_BOTH */
1155 mask = bank->enabled_non_wakeup_gpios & bank->context.risingdetect;
1156 mask &= ~bank->context.fallingdetect;
1157 bank->saved_datain &= ~mask;
1158
1159 if (!may_lose_context)
1160 goto update_gpio_context_count;
1161
1162 /*
1163 * If going to OFF, remove triggering for all wkup domain
1164 * non-wakeup GPIOs. Otherwise spurious IRQs will be
1165 * generated. See OMAP2420 Errata item 1.101.
1166 */
1167 if (!bank->loses_context && bank->enabled_non_wakeup_gpios) {
1168 nowake = bank->enabled_non_wakeup_gpios;
1169 omap_gpio_rmw(base + bank->regs->fallingdetect, nowake, ~nowake);
1170 omap_gpio_rmw(base + bank->regs->risingdetect, nowake, ~nowake);
1171 }
1172
1173update_gpio_context_count:
1174 if (bank->get_context_loss_count)
1175 bank->context_loss_count =
1176 bank->get_context_loss_count(dev);
1177
1178 omap_gpio_dbck_disable(bank);
1179}
1180
1181static void omap_gpio_unidle(struct gpio_bank *bank)
1182{
1183 struct device *dev = bank->chip.parent;
1184 u32 l = 0, gen, gen0, gen1;
1185 int c;
1186
1187 /*
1188 * On the first resume during the probe, the context has not
1189 * been initialised and so initialise it now. Also initialise
1190 * the context loss count.
1191 */
1192 if (bank->loses_context && !bank->context_valid) {
1193 omap_gpio_init_context(bank);
1194
1195 if (bank->get_context_loss_count)
1196 bank->context_loss_count =
1197 bank->get_context_loss_count(dev);
1198 }
1199
1200 omap_gpio_dbck_enable(bank);
1201
1202 if (bank->loses_context) {
1203 if (!bank->get_context_loss_count) {
1204 omap_gpio_restore_context(bank);
1205 } else {
1206 c = bank->get_context_loss_count(dev);
1207 if (c != bank->context_loss_count) {
1208 omap_gpio_restore_context(bank);
1209 } else {
1210 return;
1211 }
1212 }
1213 } else {
1214 /* Restore changes done for OMAP2420 errata 1.101 */
1215 writel_relaxed(bank->context.fallingdetect,
1216 bank->base + bank->regs->fallingdetect);
1217 writel_relaxed(bank->context.risingdetect,
1218 bank->base + bank->regs->risingdetect);
1219 }
1220
1221 l = readl_relaxed(bank->base + bank->regs->datain);
1222
1223 /*
1224 * Check if any of the non-wakeup interrupt GPIOs have changed
1225 * state. If so, generate an IRQ by software. This is
1226 * horribly racy, but it's the best we can do to work around
1227 * this silicon bug.
1228 */
1229 l ^= bank->saved_datain;
1230 l &= bank->enabled_non_wakeup_gpios;
1231
1232 /*
1233 * No need to generate IRQs for the rising edge for gpio IRQs
1234 * configured with falling edge only; and vice versa.
1235 */
1236 gen0 = l & bank->context.fallingdetect;
1237 gen0 &= bank->saved_datain;
1238
1239 gen1 = l & bank->context.risingdetect;
1240 gen1 &= ~(bank->saved_datain);
1241
1242 /* FIXME: Consider GPIO IRQs with level detections properly! */
1243 gen = l & (~(bank->context.fallingdetect) &
1244 ~(bank->context.risingdetect));
1245 /* Consider all GPIO IRQs needed to be updated */
1246 gen |= gen0 | gen1;
1247
1248 if (gen) {
1249 u32 old0, old1;
1250
1251 old0 = readl_relaxed(bank->base + bank->regs->leveldetect0);
1252 old1 = readl_relaxed(bank->base + bank->regs->leveldetect1);
1253
1254 if (!bank->regs->irqstatus_raw0) {
1255 writel_relaxed(old0 | gen, bank->base +
1256 bank->regs->leveldetect0);
1257 writel_relaxed(old1 | gen, bank->base +
1258 bank->regs->leveldetect1);
1259 }
1260
1261 if (bank->regs->irqstatus_raw0) {
1262 writel_relaxed(old0 | l, bank->base +
1263 bank->regs->leveldetect0);
1264 writel_relaxed(old1 | l, bank->base +
1265 bank->regs->leveldetect1);
1266 }
1267 writel_relaxed(old0, bank->base + bank->regs->leveldetect0);
1268 writel_relaxed(old1, bank->base + bank->regs->leveldetect1);
1269 }
1270}
1271
1272static int gpio_omap_cpu_notifier(struct notifier_block *nb,
1273 unsigned long cmd, void *v)
1274{
1275 struct gpio_bank *bank;
1276 unsigned long flags;
1277 int ret = NOTIFY_OK;
1278 u32 isr, mask;
1279
1280 bank = container_of(nb, struct gpio_bank, nb);
1281
1282 raw_spin_lock_irqsave(&bank->lock, flags);
1283 if (bank->is_suspended)
1284 goto out_unlock;
1285
1286 switch (cmd) {
1287 case CPU_CLUSTER_PM_ENTER:
1288 mask = omap_get_gpio_irqbank_mask(bank);
1289 isr = readl_relaxed(bank->base + bank->regs->irqstatus) & mask;
1290 if (isr) {
1291 ret = NOTIFY_BAD;
1292 break;
1293 }
1294 omap_gpio_idle(bank, true);
1295 break;
1296 case CPU_CLUSTER_PM_ENTER_FAILED:
1297 case CPU_CLUSTER_PM_EXIT:
1298 omap_gpio_unidle(bank);
1299 break;
1300 }
1301
1302out_unlock:
1303 raw_spin_unlock_irqrestore(&bank->lock, flags);
1304
1305 return ret;
1306}
1307
1308static const struct omap_gpio_reg_offs omap2_gpio_regs = {
1309 .revision = OMAP24XX_GPIO_REVISION,
1310 .sysconfig = OMAP24XX_GPIO_SYSCONFIG,
1311 .direction = OMAP24XX_GPIO_OE,
1312 .datain = OMAP24XX_GPIO_DATAIN,
1313 .dataout = OMAP24XX_GPIO_DATAOUT,
1314 .set_dataout = OMAP24XX_GPIO_SETDATAOUT,
1315 .clr_dataout = OMAP24XX_GPIO_CLEARDATAOUT,
1316 .irqstatus = OMAP24XX_GPIO_IRQSTATUS1,
1317 .irqstatus2 = OMAP24XX_GPIO_IRQSTATUS2,
1318 .irqenable = OMAP24XX_GPIO_IRQENABLE1,
1319 .irqenable2 = OMAP24XX_GPIO_IRQENABLE2,
1320 .set_irqenable = OMAP24XX_GPIO_SETIRQENABLE1,
1321 .clr_irqenable = OMAP24XX_GPIO_CLEARIRQENABLE1,
1322 .debounce = OMAP24XX_GPIO_DEBOUNCE_VAL,
1323 .debounce_en = OMAP24XX_GPIO_DEBOUNCE_EN,
1324 .ctrl = OMAP24XX_GPIO_CTRL,
1325 .wkup_en = OMAP24XX_GPIO_WAKE_EN,
1326 .leveldetect0 = OMAP24XX_GPIO_LEVELDETECT0,
1327 .leveldetect1 = OMAP24XX_GPIO_LEVELDETECT1,
1328 .risingdetect = OMAP24XX_GPIO_RISINGDETECT,
1329 .fallingdetect = OMAP24XX_GPIO_FALLINGDETECT,
1330};
1331
1332static const struct omap_gpio_reg_offs omap4_gpio_regs = {
1333 .revision = OMAP4_GPIO_REVISION,
1334 .sysconfig = OMAP4_GPIO_SYSCONFIG,
1335 .direction = OMAP4_GPIO_OE,
1336 .datain = OMAP4_GPIO_DATAIN,
1337 .dataout = OMAP4_GPIO_DATAOUT,
1338 .set_dataout = OMAP4_GPIO_SETDATAOUT,
1339 .clr_dataout = OMAP4_GPIO_CLEARDATAOUT,
1340 .irqstatus = OMAP4_GPIO_IRQSTATUS0,
1341 .irqstatus2 = OMAP4_GPIO_IRQSTATUS1,
1342 .irqstatus_raw0 = OMAP4_GPIO_IRQSTATUSRAW0,
1343 .irqstatus_raw1 = OMAP4_GPIO_IRQSTATUSRAW1,
1344 .irqenable = OMAP4_GPIO_IRQSTATUSSET0,
1345 .irqenable2 = OMAP4_GPIO_IRQSTATUSSET1,
1346 .set_irqenable = OMAP4_GPIO_IRQSTATUSSET0,
1347 .clr_irqenable = OMAP4_GPIO_IRQSTATUSCLR0,
1348 .debounce = OMAP4_GPIO_DEBOUNCINGTIME,
1349 .debounce_en = OMAP4_GPIO_DEBOUNCENABLE,
1350 .ctrl = OMAP4_GPIO_CTRL,
1351 .wkup_en = OMAP4_GPIO_IRQWAKEN0,
1352 .leveldetect0 = OMAP4_GPIO_LEVELDETECT0,
1353 .leveldetect1 = OMAP4_GPIO_LEVELDETECT1,
1354 .risingdetect = OMAP4_GPIO_RISINGDETECT,
1355 .fallingdetect = OMAP4_GPIO_FALLINGDETECT,
1356};
1357
1358static const struct omap_gpio_platform_data omap2_pdata = {
1359 .regs = &omap2_gpio_regs,
1360 .bank_width = 32,
1361 .dbck_flag = false,
1362};
1363
1364static const struct omap_gpio_platform_data omap3_pdata = {
1365 .regs = &omap2_gpio_regs,
1366 .bank_width = 32,
1367 .dbck_flag = true,
1368};
1369
1370static const struct omap_gpio_platform_data omap4_pdata = {
1371 .regs = &omap4_gpio_regs,
1372 .bank_width = 32,
1373 .dbck_flag = true,
1374};
1375
1376static const struct of_device_id omap_gpio_match[] = {
1377 {
1378 .compatible = "ti,omap4-gpio",
1379 .data = &omap4_pdata,
1380 },
1381 {
1382 .compatible = "ti,omap3-gpio",
1383 .data = &omap3_pdata,
1384 },
1385 {
1386 .compatible = "ti,omap2-gpio",
1387 .data = &omap2_pdata,
1388 },
1389 { },
1390};
1391MODULE_DEVICE_TABLE(of, omap_gpio_match);
1392
1393static int omap_gpio_probe(struct platform_device *pdev)
1394{
1395 struct device *dev = &pdev->dev;
1396 struct device_node *node = dev->of_node;
1397 const struct omap_gpio_platform_data *pdata;
1398 struct gpio_bank *bank;
1399 int ret;
1400
1401 pdata = device_get_match_data(dev);
1402
1403 pdata = pdata ?: dev_get_platdata(dev);
1404 if (!pdata)
1405 return -EINVAL;
1406
1407 bank = devm_kzalloc(dev, sizeof(*bank), GFP_KERNEL);
1408 if (!bank)
1409 return -ENOMEM;
1410
1411 bank->dev = dev;
1412
1413 bank->irq = platform_get_irq(pdev, 0);
1414 if (bank->irq < 0)
1415 return bank->irq;
1416
1417 bank->chip.parent = dev;
1418 bank->chip.owner = THIS_MODULE;
1419 bank->dbck_flag = pdata->dbck_flag;
1420 bank->stride = pdata->bank_stride;
1421 bank->width = pdata->bank_width;
1422 bank->is_mpuio = pdata->is_mpuio;
1423 bank->non_wakeup_gpios = pdata->non_wakeup_gpios;
1424 bank->regs = pdata->regs;
1425
1426 if (node) {
1427 if (!of_property_read_bool(node, "ti,gpio-always-on"))
1428 bank->loses_context = true;
1429 } else {
1430 bank->loses_context = pdata->loses_context;
1431
1432 if (bank->loses_context)
1433 bank->get_context_loss_count =
1434 pdata->get_context_loss_count;
1435 }
1436
1437 if (bank->regs->set_dataout && bank->regs->clr_dataout)
1438 bank->set_dataout = omap_set_gpio_dataout_reg;
1439 else
1440 bank->set_dataout = omap_set_gpio_dataout_mask;
1441
1442 raw_spin_lock_init(&bank->lock);
1443 raw_spin_lock_init(&bank->wa_lock);
1444
1445 /* Static mapping, never released */
1446 bank->base = devm_platform_ioremap_resource(pdev, 0);
1447 if (IS_ERR(bank->base)) {
1448 return PTR_ERR(bank->base);
1449 }
1450
1451 if (bank->dbck_flag) {
1452 bank->dbck = devm_clk_get(dev, "dbclk");
1453 if (IS_ERR(bank->dbck)) {
1454 dev_err(dev,
1455 "Could not get gpio dbck. Disable debounce\n");
1456 bank->dbck_flag = false;
1457 } else {
1458 clk_prepare(bank->dbck);
1459 }
1460 }
1461
1462 platform_set_drvdata(pdev, bank);
1463
1464 pm_runtime_enable(dev);
1465 pm_runtime_get_sync(dev);
1466
1467 if (bank->is_mpuio)
1468 omap_mpuio_init(bank);
1469
1470 omap_gpio_mod_init(bank);
1471
1472 ret = omap_gpio_chip_init(bank, dev);
1473 if (ret) {
1474 pm_runtime_put_sync(dev);
1475 pm_runtime_disable(dev);
1476 if (bank->dbck_flag)
1477 clk_unprepare(bank->dbck);
1478 return ret;
1479 }
1480
1481 omap_gpio_show_rev(bank);
1482
1483 bank->nb.notifier_call = gpio_omap_cpu_notifier;
1484 cpu_pm_register_notifier(&bank->nb);
1485
1486 pm_runtime_put(dev);
1487
1488 return 0;
1489}
1490
1491static void omap_gpio_remove(struct platform_device *pdev)
1492{
1493 struct gpio_bank *bank = platform_get_drvdata(pdev);
1494
1495 cpu_pm_unregister_notifier(&bank->nb);
1496 gpiochip_remove(&bank->chip);
1497 pm_runtime_disable(&pdev->dev);
1498 if (bank->dbck_flag)
1499 clk_unprepare(bank->dbck);
1500}
1501
1502static int __maybe_unused omap_gpio_runtime_suspend(struct device *dev)
1503{
1504 struct gpio_bank *bank = dev_get_drvdata(dev);
1505 unsigned long flags;
1506
1507 raw_spin_lock_irqsave(&bank->lock, flags);
1508 omap_gpio_idle(bank, true);
1509 bank->is_suspended = true;
1510 raw_spin_unlock_irqrestore(&bank->lock, flags);
1511
1512 return 0;
1513}
1514
1515static int __maybe_unused omap_gpio_runtime_resume(struct device *dev)
1516{
1517 struct gpio_bank *bank = dev_get_drvdata(dev);
1518 unsigned long flags;
1519
1520 raw_spin_lock_irqsave(&bank->lock, flags);
1521 omap_gpio_unidle(bank);
1522 bank->is_suspended = false;
1523 raw_spin_unlock_irqrestore(&bank->lock, flags);
1524
1525 return 0;
1526}
1527
1528static int __maybe_unused omap_gpio_suspend(struct device *dev)
1529{
1530 struct gpio_bank *bank = dev_get_drvdata(dev);
1531
1532 if (bank->is_suspended)
1533 return 0;
1534
1535 bank->needs_resume = 1;
1536
1537 return omap_gpio_runtime_suspend(dev);
1538}
1539
1540static int __maybe_unused omap_gpio_resume(struct device *dev)
1541{
1542 struct gpio_bank *bank = dev_get_drvdata(dev);
1543
1544 if (!bank->needs_resume)
1545 return 0;
1546
1547 bank->needs_resume = 0;
1548
1549 return omap_gpio_runtime_resume(dev);
1550}
1551
1552static const struct dev_pm_ops gpio_pm_ops = {
1553 SET_RUNTIME_PM_OPS(omap_gpio_runtime_suspend, omap_gpio_runtime_resume,
1554 NULL)
1555 SET_LATE_SYSTEM_SLEEP_PM_OPS(omap_gpio_suspend, omap_gpio_resume)
1556};
1557
1558static struct platform_driver omap_gpio_driver = {
1559 .probe = omap_gpio_probe,
1560 .remove_new = omap_gpio_remove,
1561 .driver = {
1562 .name = "omap_gpio",
1563 .pm = &gpio_pm_ops,
1564 .of_match_table = omap_gpio_match,
1565 },
1566};
1567
1568/*
1569 * gpio driver register needs to be done before
1570 * machine_init functions access gpio APIs.
1571 * Hence omap_gpio_drv_reg() is a postcore_initcall.
1572 */
1573static int __init omap_gpio_drv_reg(void)
1574{
1575 return platform_driver_register(&omap_gpio_driver);
1576}
1577postcore_initcall(omap_gpio_drv_reg);
1578
1579static void __exit omap_gpio_exit(void)
1580{
1581 platform_driver_unregister(&omap_gpio_driver);
1582}
1583module_exit(omap_gpio_exit);
1584
1585MODULE_DESCRIPTION("omap gpio driver");
1586MODULE_ALIAS("platform:gpio-omap");
1587MODULE_LICENSE("GPL v2");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Support functions for OMAP GPIO
4 *
5 * Copyright (C) 2003-2005 Nokia Corporation
6 * Written by Juha Yrjölä <juha.yrjola@nokia.com>
7 *
8 * Copyright (C) 2009 Texas Instruments
9 * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
10 */
11
12#include <linux/init.h>
13#include <linux/module.h>
14#include <linux/interrupt.h>
15#include <linux/syscore_ops.h>
16#include <linux/err.h>
17#include <linux/clk.h>
18#include <linux/io.h>
19#include <linux/cpu_pm.h>
20#include <linux/device.h>
21#include <linux/pm_runtime.h>
22#include <linux/pm.h>
23#include <linux/of.h>
24#include <linux/of_device.h>
25#include <linux/gpio/driver.h>
26#include <linux/bitops.h>
27#include <linux/platform_data/gpio-omap.h>
28
29#define OMAP4_GPIO_DEBOUNCINGTIME_MASK 0xFF
30
31struct gpio_regs {
32 u32 sysconfig;
33 u32 irqenable1;
34 u32 irqenable2;
35 u32 wake_en;
36 u32 ctrl;
37 u32 oe;
38 u32 leveldetect0;
39 u32 leveldetect1;
40 u32 risingdetect;
41 u32 fallingdetect;
42 u32 dataout;
43 u32 debounce;
44 u32 debounce_en;
45};
46
47struct gpio_bank {
48 void __iomem *base;
49 const struct omap_gpio_reg_offs *regs;
50
51 int irq;
52 u32 non_wakeup_gpios;
53 u32 enabled_non_wakeup_gpios;
54 struct gpio_regs context;
55 u32 saved_datain;
56 u32 level_mask;
57 u32 toggle_mask;
58 raw_spinlock_t lock;
59 raw_spinlock_t wa_lock;
60 struct gpio_chip chip;
61 struct clk *dbck;
62 struct notifier_block nb;
63 unsigned int is_suspended:1;
64 unsigned int needs_resume:1;
65 u32 mod_usage;
66 u32 irq_usage;
67 u32 dbck_enable_mask;
68 bool dbck_enabled;
69 bool is_mpuio;
70 bool dbck_flag;
71 bool loses_context;
72 bool context_valid;
73 int stride;
74 u32 width;
75 int context_loss_count;
76
77 void (*set_dataout)(struct gpio_bank *bank, unsigned gpio, int enable);
78 int (*get_context_loss_count)(struct device *dev);
79};
80
81#define GPIO_MOD_CTRL_BIT BIT(0)
82
83#define BANK_USED(bank) (bank->mod_usage || bank->irq_usage)
84#define LINE_USED(line, offset) (line & (BIT(offset)))
85
86static void omap_gpio_unmask_irq(struct irq_data *d);
87
88static inline struct gpio_bank *omap_irq_data_get_bank(struct irq_data *d)
89{
90 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
91 return gpiochip_get_data(chip);
92}
93
94static inline u32 omap_gpio_rmw(void __iomem *reg, u32 mask, bool set)
95{
96 u32 val = readl_relaxed(reg);
97
98 if (set)
99 val |= mask;
100 else
101 val &= ~mask;
102
103 writel_relaxed(val, reg);
104
105 return val;
106}
107
108static void omap_set_gpio_direction(struct gpio_bank *bank, int gpio,
109 int is_input)
110{
111 bank->context.oe = omap_gpio_rmw(bank->base + bank->regs->direction,
112 BIT(gpio), is_input);
113}
114
115
116/* set data out value using dedicate set/clear register */
117static void omap_set_gpio_dataout_reg(struct gpio_bank *bank, unsigned offset,
118 int enable)
119{
120 void __iomem *reg = bank->base;
121 u32 l = BIT(offset);
122
123 if (enable) {
124 reg += bank->regs->set_dataout;
125 bank->context.dataout |= l;
126 } else {
127 reg += bank->regs->clr_dataout;
128 bank->context.dataout &= ~l;
129 }
130
131 writel_relaxed(l, reg);
132}
133
134/* set data out value using mask register */
135static void omap_set_gpio_dataout_mask(struct gpio_bank *bank, unsigned offset,
136 int enable)
137{
138 bank->context.dataout = omap_gpio_rmw(bank->base + bank->regs->dataout,
139 BIT(offset), enable);
140}
141
142static inline void omap_gpio_dbck_enable(struct gpio_bank *bank)
143{
144 if (bank->dbck_enable_mask && !bank->dbck_enabled) {
145 clk_enable(bank->dbck);
146 bank->dbck_enabled = true;
147
148 writel_relaxed(bank->dbck_enable_mask,
149 bank->base + bank->regs->debounce_en);
150 }
151}
152
153static inline void omap_gpio_dbck_disable(struct gpio_bank *bank)
154{
155 if (bank->dbck_enable_mask && bank->dbck_enabled) {
156 /*
157 * Disable debounce before cutting it's clock. If debounce is
158 * enabled but the clock is not, GPIO module seems to be unable
159 * to detect events and generate interrupts at least on OMAP3.
160 */
161 writel_relaxed(0, bank->base + bank->regs->debounce_en);
162
163 clk_disable(bank->dbck);
164 bank->dbck_enabled = false;
165 }
166}
167
168/**
169 * omap2_set_gpio_debounce - low level gpio debounce time
170 * @bank: the gpio bank we're acting upon
171 * @offset: the gpio number on this @bank
172 * @debounce: debounce time to use
173 *
174 * OMAP's debounce time is in 31us steps
175 * <debounce time> = (GPIO_DEBOUNCINGTIME[7:0].DEBOUNCETIME + 1) x 31
176 * so we need to convert and round up to the closest unit.
177 *
178 * Return: 0 on success, negative error otherwise.
179 */
180static int omap2_set_gpio_debounce(struct gpio_bank *bank, unsigned offset,
181 unsigned debounce)
182{
183 u32 val;
184 u32 l;
185 bool enable = !!debounce;
186
187 if (!bank->dbck_flag)
188 return -ENOTSUPP;
189
190 if (enable) {
191 debounce = DIV_ROUND_UP(debounce, 31) - 1;
192 if ((debounce & OMAP4_GPIO_DEBOUNCINGTIME_MASK) != debounce)
193 return -EINVAL;
194 }
195
196 l = BIT(offset);
197
198 clk_enable(bank->dbck);
199 writel_relaxed(debounce, bank->base + bank->regs->debounce);
200
201 val = omap_gpio_rmw(bank->base + bank->regs->debounce_en, l, enable);
202 bank->dbck_enable_mask = val;
203
204 clk_disable(bank->dbck);
205 /*
206 * Enable debounce clock per module.
207 * This call is mandatory because in omap_gpio_request() when
208 * *_runtime_get_sync() is called, _gpio_dbck_enable() within
209 * runtime callbck fails to turn on dbck because dbck_enable_mask
210 * used within _gpio_dbck_enable() is still not initialized at
211 * that point. Therefore we have to enable dbck here.
212 */
213 omap_gpio_dbck_enable(bank);
214 if (bank->dbck_enable_mask) {
215 bank->context.debounce = debounce;
216 bank->context.debounce_en = val;
217 }
218
219 return 0;
220}
221
222/**
223 * omap_clear_gpio_debounce - clear debounce settings for a gpio
224 * @bank: the gpio bank we're acting upon
225 * @offset: the gpio number on this @bank
226 *
227 * If a gpio is using debounce, then clear the debounce enable bit and if
228 * this is the only gpio in this bank using debounce, then clear the debounce
229 * time too. The debounce clock will also be disabled when calling this function
230 * if this is the only gpio in the bank using debounce.
231 */
232static void omap_clear_gpio_debounce(struct gpio_bank *bank, unsigned offset)
233{
234 u32 gpio_bit = BIT(offset);
235
236 if (!bank->dbck_flag)
237 return;
238
239 if (!(bank->dbck_enable_mask & gpio_bit))
240 return;
241
242 bank->dbck_enable_mask &= ~gpio_bit;
243 bank->context.debounce_en &= ~gpio_bit;
244 writel_relaxed(bank->context.debounce_en,
245 bank->base + bank->regs->debounce_en);
246
247 if (!bank->dbck_enable_mask) {
248 bank->context.debounce = 0;
249 writel_relaxed(bank->context.debounce, bank->base +
250 bank->regs->debounce);
251 clk_disable(bank->dbck);
252 bank->dbck_enabled = false;
253 }
254}
255
256/*
257 * Off mode wake-up capable GPIOs in bank(s) that are in the wakeup domain.
258 * See TRM section for GPIO for "Wake-Up Generation" for the list of GPIOs
259 * in wakeup domain. If bank->non_wakeup_gpios is not configured, assume none
260 * are capable waking up the system from off mode.
261 */
262static bool omap_gpio_is_off_wakeup_capable(struct gpio_bank *bank, u32 gpio_mask)
263{
264 u32 no_wake = bank->non_wakeup_gpios;
265
266 if (no_wake)
267 return !!(~no_wake & gpio_mask);
268
269 return false;
270}
271
272static inline void omap_set_gpio_trigger(struct gpio_bank *bank, int gpio,
273 unsigned trigger)
274{
275 void __iomem *base = bank->base;
276 u32 gpio_bit = BIT(gpio);
277
278 omap_gpio_rmw(base + bank->regs->leveldetect0, gpio_bit,
279 trigger & IRQ_TYPE_LEVEL_LOW);
280 omap_gpio_rmw(base + bank->regs->leveldetect1, gpio_bit,
281 trigger & IRQ_TYPE_LEVEL_HIGH);
282
283 /*
284 * We need the edge detection enabled for to allow the GPIO block
285 * to be woken from idle state. Set the appropriate edge detection
286 * in addition to the level detection.
287 */
288 omap_gpio_rmw(base + bank->regs->risingdetect, gpio_bit,
289 trigger & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_LEVEL_HIGH));
290 omap_gpio_rmw(base + bank->regs->fallingdetect, gpio_bit,
291 trigger & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_LEVEL_LOW));
292
293 bank->context.leveldetect0 =
294 readl_relaxed(bank->base + bank->regs->leveldetect0);
295 bank->context.leveldetect1 =
296 readl_relaxed(bank->base + bank->regs->leveldetect1);
297 bank->context.risingdetect =
298 readl_relaxed(bank->base + bank->regs->risingdetect);
299 bank->context.fallingdetect =
300 readl_relaxed(bank->base + bank->regs->fallingdetect);
301
302 bank->level_mask = bank->context.leveldetect0 |
303 bank->context.leveldetect1;
304
305 /* This part needs to be executed always for OMAP{34xx, 44xx} */
306 if (!bank->regs->irqctrl && !omap_gpio_is_off_wakeup_capable(bank, gpio)) {
307 /*
308 * Log the edge gpio and manually trigger the IRQ
309 * after resume if the input level changes
310 * to avoid irq lost during PER RET/OFF mode
311 * Applies for omap2 non-wakeup gpio and all omap3 gpios
312 */
313 if (trigger & IRQ_TYPE_EDGE_BOTH)
314 bank->enabled_non_wakeup_gpios |= gpio_bit;
315 else
316 bank->enabled_non_wakeup_gpios &= ~gpio_bit;
317 }
318}
319
320/*
321 * This only applies to chips that can't do both rising and falling edge
322 * detection at once. For all other chips, this function is a noop.
323 */
324static void omap_toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio)
325{
326 if (IS_ENABLED(CONFIG_ARCH_OMAP1) && bank->regs->irqctrl) {
327 void __iomem *reg = bank->base + bank->regs->irqctrl;
328
329 writel_relaxed(readl_relaxed(reg) ^ BIT(gpio), reg);
330 }
331}
332
333static int omap_set_gpio_triggering(struct gpio_bank *bank, int gpio,
334 unsigned trigger)
335{
336 void __iomem *reg = bank->base;
337 u32 l = 0;
338
339 if (bank->regs->leveldetect0 && bank->regs->wkup_en) {
340 omap_set_gpio_trigger(bank, gpio, trigger);
341 } else if (bank->regs->irqctrl) {
342 reg += bank->regs->irqctrl;
343
344 l = readl_relaxed(reg);
345 if ((trigger & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH)
346 bank->toggle_mask |= BIT(gpio);
347 if (trigger & IRQ_TYPE_EDGE_RISING)
348 l |= BIT(gpio);
349 else if (trigger & IRQ_TYPE_EDGE_FALLING)
350 l &= ~(BIT(gpio));
351 else
352 return -EINVAL;
353
354 writel_relaxed(l, reg);
355 } else if (bank->regs->edgectrl1) {
356 if (gpio & 0x08)
357 reg += bank->regs->edgectrl2;
358 else
359 reg += bank->regs->edgectrl1;
360
361 gpio &= 0x07;
362 l = readl_relaxed(reg);
363 l &= ~(3 << (gpio << 1));
364 if (trigger & IRQ_TYPE_EDGE_RISING)
365 l |= 2 << (gpio << 1);
366 if (trigger & IRQ_TYPE_EDGE_FALLING)
367 l |= BIT(gpio << 1);
368 writel_relaxed(l, reg);
369 }
370 return 0;
371}
372
373static void omap_enable_gpio_module(struct gpio_bank *bank, unsigned offset)
374{
375 if (bank->regs->pinctrl) {
376 void __iomem *reg = bank->base + bank->regs->pinctrl;
377
378 /* Claim the pin for MPU */
379 writel_relaxed(readl_relaxed(reg) | (BIT(offset)), reg);
380 }
381
382 if (bank->regs->ctrl && !BANK_USED(bank)) {
383 void __iomem *reg = bank->base + bank->regs->ctrl;
384 u32 ctrl;
385
386 ctrl = readl_relaxed(reg);
387 /* Module is enabled, clocks are not gated */
388 ctrl &= ~GPIO_MOD_CTRL_BIT;
389 writel_relaxed(ctrl, reg);
390 bank->context.ctrl = ctrl;
391 }
392}
393
394static void omap_disable_gpio_module(struct gpio_bank *bank, unsigned offset)
395{
396 if (bank->regs->ctrl && !BANK_USED(bank)) {
397 void __iomem *reg = bank->base + bank->regs->ctrl;
398 u32 ctrl;
399
400 ctrl = readl_relaxed(reg);
401 /* Module is disabled, clocks are gated */
402 ctrl |= GPIO_MOD_CTRL_BIT;
403 writel_relaxed(ctrl, reg);
404 bank->context.ctrl = ctrl;
405 }
406}
407
408static int omap_gpio_is_input(struct gpio_bank *bank, unsigned offset)
409{
410 void __iomem *reg = bank->base + bank->regs->direction;
411
412 return readl_relaxed(reg) & BIT(offset);
413}
414
415static void omap_gpio_init_irq(struct gpio_bank *bank, unsigned offset)
416{
417 if (!LINE_USED(bank->mod_usage, offset)) {
418 omap_enable_gpio_module(bank, offset);
419 omap_set_gpio_direction(bank, offset, 1);
420 }
421 bank->irq_usage |= BIT(offset);
422}
423
424static int omap_gpio_irq_type(struct irq_data *d, unsigned type)
425{
426 struct gpio_bank *bank = omap_irq_data_get_bank(d);
427 int retval;
428 unsigned long flags;
429 unsigned offset = d->hwirq;
430
431 if (type & ~IRQ_TYPE_SENSE_MASK)
432 return -EINVAL;
433
434 if (!bank->regs->leveldetect0 &&
435 (type & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH)))
436 return -EINVAL;
437
438 raw_spin_lock_irqsave(&bank->lock, flags);
439 retval = omap_set_gpio_triggering(bank, offset, type);
440 if (retval) {
441 raw_spin_unlock_irqrestore(&bank->lock, flags);
442 goto error;
443 }
444 omap_gpio_init_irq(bank, offset);
445 if (!omap_gpio_is_input(bank, offset)) {
446 raw_spin_unlock_irqrestore(&bank->lock, flags);
447 retval = -EINVAL;
448 goto error;
449 }
450 raw_spin_unlock_irqrestore(&bank->lock, flags);
451
452 if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
453 irq_set_handler_locked(d, handle_level_irq);
454 else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
455 /*
456 * Edge IRQs are already cleared/acked in irq_handler and
457 * not need to be masked, as result handle_edge_irq()
458 * logic is excessed here and may cause lose of interrupts.
459 * So just use handle_simple_irq.
460 */
461 irq_set_handler_locked(d, handle_simple_irq);
462
463 return 0;
464
465error:
466 return retval;
467}
468
469static void omap_clear_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
470{
471 void __iomem *reg = bank->base;
472
473 reg += bank->regs->irqstatus;
474 writel_relaxed(gpio_mask, reg);
475
476 /* Workaround for clearing DSP GPIO interrupts to allow retention */
477 if (bank->regs->irqstatus2) {
478 reg = bank->base + bank->regs->irqstatus2;
479 writel_relaxed(gpio_mask, reg);
480 }
481
482 /* Flush posted write for the irq status to avoid spurious interrupts */
483 readl_relaxed(reg);
484}
485
486static inline void omap_clear_gpio_irqstatus(struct gpio_bank *bank,
487 unsigned offset)
488{
489 omap_clear_gpio_irqbank(bank, BIT(offset));
490}
491
492static u32 omap_get_gpio_irqbank_mask(struct gpio_bank *bank)
493{
494 void __iomem *reg = bank->base;
495 u32 l;
496 u32 mask = (BIT(bank->width)) - 1;
497
498 reg += bank->regs->irqenable;
499 l = readl_relaxed(reg);
500 if (bank->regs->irqenable_inv)
501 l = ~l;
502 l &= mask;
503 return l;
504}
505
506static inline void omap_set_gpio_irqenable(struct gpio_bank *bank,
507 unsigned offset, int enable)
508{
509 void __iomem *reg = bank->base;
510 u32 gpio_mask = BIT(offset);
511
512 if (bank->regs->set_irqenable && bank->regs->clr_irqenable) {
513 if (enable) {
514 reg += bank->regs->set_irqenable;
515 bank->context.irqenable1 |= gpio_mask;
516 } else {
517 reg += bank->regs->clr_irqenable;
518 bank->context.irqenable1 &= ~gpio_mask;
519 }
520 writel_relaxed(gpio_mask, reg);
521 } else {
522 bank->context.irqenable1 =
523 omap_gpio_rmw(reg + bank->regs->irqenable, gpio_mask,
524 enable ^ bank->regs->irqenable_inv);
525 }
526
527 /*
528 * Program GPIO wakeup along with IRQ enable to satisfy OMAP4430 TRM
529 * note requiring correlation between the IRQ enable registers and
530 * the wakeup registers. In any case, we want wakeup from idle
531 * enabled for the GPIOs which support this feature.
532 */
533 if (bank->regs->wkup_en &&
534 (bank->regs->edgectrl1 || !(bank->non_wakeup_gpios & gpio_mask))) {
535 bank->context.wake_en =
536 omap_gpio_rmw(bank->base + bank->regs->wkup_en,
537 gpio_mask, enable);
538 }
539}
540
541/* Use disable_irq_wake() and enable_irq_wake() functions from drivers */
542static int omap_gpio_wake_enable(struct irq_data *d, unsigned int enable)
543{
544 struct gpio_bank *bank = omap_irq_data_get_bank(d);
545
546 return irq_set_irq_wake(bank->irq, enable);
547}
548
549/*
550 * We need to unmask the GPIO bank interrupt as soon as possible to
551 * avoid missing GPIO interrupts for other lines in the bank.
552 * Then we need to mask-read-clear-unmask the triggered GPIO lines
553 * in the bank to avoid missing nested interrupts for a GPIO line.
554 * If we wait to unmask individual GPIO lines in the bank after the
555 * line's interrupt handler has been run, we may miss some nested
556 * interrupts.
557 */
558static irqreturn_t omap_gpio_irq_handler(int irq, void *gpiobank)
559{
560 void __iomem *isr_reg = NULL;
561 u32 enabled, isr, edge;
562 unsigned int bit;
563 struct gpio_bank *bank = gpiobank;
564 unsigned long wa_lock_flags;
565 unsigned long lock_flags;
566
567 isr_reg = bank->base + bank->regs->irqstatus;
568 if (WARN_ON(!isr_reg))
569 goto exit;
570
571 if (WARN_ONCE(!pm_runtime_active(bank->chip.parent),
572 "gpio irq%i while runtime suspended?\n", irq))
573 return IRQ_NONE;
574
575 while (1) {
576 raw_spin_lock_irqsave(&bank->lock, lock_flags);
577
578 enabled = omap_get_gpio_irqbank_mask(bank);
579 isr = readl_relaxed(isr_reg) & enabled;
580
581 /*
582 * Clear edge sensitive interrupts before calling handler(s)
583 * so subsequent edge transitions are not missed while the
584 * handlers are running.
585 */
586 edge = isr & ~bank->level_mask;
587 if (edge)
588 omap_clear_gpio_irqbank(bank, edge);
589
590 raw_spin_unlock_irqrestore(&bank->lock, lock_flags);
591
592 if (!isr)
593 break;
594
595 while (isr) {
596 bit = __ffs(isr);
597 isr &= ~(BIT(bit));
598
599 raw_spin_lock_irqsave(&bank->lock, lock_flags);
600 /*
601 * Some chips can't respond to both rising and falling
602 * at the same time. If this irq was requested with
603 * both flags, we need to flip the ICR data for the IRQ
604 * to respond to the IRQ for the opposite direction.
605 * This will be indicated in the bank toggle_mask.
606 */
607 if (bank->toggle_mask & (BIT(bit)))
608 omap_toggle_gpio_edge_triggering(bank, bit);
609
610 raw_spin_unlock_irqrestore(&bank->lock, lock_flags);
611
612 raw_spin_lock_irqsave(&bank->wa_lock, wa_lock_flags);
613
614 generic_handle_domain_irq(bank->chip.irq.domain, bit);
615
616 raw_spin_unlock_irqrestore(&bank->wa_lock,
617 wa_lock_flags);
618 }
619 }
620exit:
621 return IRQ_HANDLED;
622}
623
624static unsigned int omap_gpio_irq_startup(struct irq_data *d)
625{
626 struct gpio_bank *bank = omap_irq_data_get_bank(d);
627 unsigned long flags;
628 unsigned offset = d->hwirq;
629
630 raw_spin_lock_irqsave(&bank->lock, flags);
631
632 if (!LINE_USED(bank->mod_usage, offset))
633 omap_set_gpio_direction(bank, offset, 1);
634 omap_enable_gpio_module(bank, offset);
635 bank->irq_usage |= BIT(offset);
636
637 raw_spin_unlock_irqrestore(&bank->lock, flags);
638 omap_gpio_unmask_irq(d);
639
640 return 0;
641}
642
643static void omap_gpio_irq_shutdown(struct irq_data *d)
644{
645 struct gpio_bank *bank = omap_irq_data_get_bank(d);
646 unsigned long flags;
647 unsigned offset = d->hwirq;
648
649 raw_spin_lock_irqsave(&bank->lock, flags);
650 bank->irq_usage &= ~(BIT(offset));
651 omap_set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);
652 omap_clear_gpio_irqstatus(bank, offset);
653 omap_set_gpio_irqenable(bank, offset, 0);
654 if (!LINE_USED(bank->mod_usage, offset))
655 omap_clear_gpio_debounce(bank, offset);
656 omap_disable_gpio_module(bank, offset);
657 raw_spin_unlock_irqrestore(&bank->lock, flags);
658}
659
660static void omap_gpio_irq_bus_lock(struct irq_data *data)
661{
662 struct gpio_bank *bank = omap_irq_data_get_bank(data);
663
664 pm_runtime_get_sync(bank->chip.parent);
665}
666
667static void gpio_irq_bus_sync_unlock(struct irq_data *data)
668{
669 struct gpio_bank *bank = omap_irq_data_get_bank(data);
670
671 pm_runtime_put(bank->chip.parent);
672}
673
674static void omap_gpio_mask_irq(struct irq_data *d)
675{
676 struct gpio_bank *bank = omap_irq_data_get_bank(d);
677 unsigned offset = d->hwirq;
678 unsigned long flags;
679
680 raw_spin_lock_irqsave(&bank->lock, flags);
681 omap_set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);
682 omap_set_gpio_irqenable(bank, offset, 0);
683 raw_spin_unlock_irqrestore(&bank->lock, flags);
684}
685
686static void omap_gpio_unmask_irq(struct irq_data *d)
687{
688 struct gpio_bank *bank = omap_irq_data_get_bank(d);
689 unsigned offset = d->hwirq;
690 u32 trigger = irqd_get_trigger_type(d);
691 unsigned long flags;
692
693 raw_spin_lock_irqsave(&bank->lock, flags);
694 omap_set_gpio_irqenable(bank, offset, 1);
695
696 /*
697 * For level-triggered GPIOs, clearing must be done after the source
698 * is cleared, thus after the handler has run. OMAP4 needs this done
699 * after enabing the interrupt to clear the wakeup status.
700 */
701 if (bank->regs->leveldetect0 && bank->regs->wkup_en &&
702 trigger & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
703 omap_clear_gpio_irqstatus(bank, offset);
704
705 if (trigger)
706 omap_set_gpio_triggering(bank, offset, trigger);
707
708 raw_spin_unlock_irqrestore(&bank->lock, flags);
709}
710
711/*---------------------------------------------------------------------*/
712
713static int omap_mpuio_suspend_noirq(struct device *dev)
714{
715 struct gpio_bank *bank = dev_get_drvdata(dev);
716 void __iomem *mask_reg = bank->base +
717 OMAP_MPUIO_GPIO_MASKIT / bank->stride;
718 unsigned long flags;
719
720 raw_spin_lock_irqsave(&bank->lock, flags);
721 writel_relaxed(0xffff & ~bank->context.wake_en, mask_reg);
722 raw_spin_unlock_irqrestore(&bank->lock, flags);
723
724 return 0;
725}
726
727static int omap_mpuio_resume_noirq(struct device *dev)
728{
729 struct gpio_bank *bank = dev_get_drvdata(dev);
730 void __iomem *mask_reg = bank->base +
731 OMAP_MPUIO_GPIO_MASKIT / bank->stride;
732 unsigned long flags;
733
734 raw_spin_lock_irqsave(&bank->lock, flags);
735 writel_relaxed(bank->context.wake_en, mask_reg);
736 raw_spin_unlock_irqrestore(&bank->lock, flags);
737
738 return 0;
739}
740
741static const struct dev_pm_ops omap_mpuio_dev_pm_ops = {
742 .suspend_noirq = omap_mpuio_suspend_noirq,
743 .resume_noirq = omap_mpuio_resume_noirq,
744};
745
746/* use platform_driver for this. */
747static struct platform_driver omap_mpuio_driver = {
748 .driver = {
749 .name = "mpuio",
750 .pm = &omap_mpuio_dev_pm_ops,
751 },
752};
753
754static struct platform_device omap_mpuio_device = {
755 .name = "mpuio",
756 .id = -1,
757 .dev = {
758 .driver = &omap_mpuio_driver.driver,
759 }
760 /* could list the /proc/iomem resources */
761};
762
763static inline void omap_mpuio_init(struct gpio_bank *bank)
764{
765 platform_set_drvdata(&omap_mpuio_device, bank);
766
767 if (platform_driver_register(&omap_mpuio_driver) == 0)
768 (void) platform_device_register(&omap_mpuio_device);
769}
770
771/*---------------------------------------------------------------------*/
772
773static int omap_gpio_request(struct gpio_chip *chip, unsigned offset)
774{
775 struct gpio_bank *bank = gpiochip_get_data(chip);
776 unsigned long flags;
777
778 pm_runtime_get_sync(chip->parent);
779
780 raw_spin_lock_irqsave(&bank->lock, flags);
781 omap_enable_gpio_module(bank, offset);
782 bank->mod_usage |= BIT(offset);
783 raw_spin_unlock_irqrestore(&bank->lock, flags);
784
785 return 0;
786}
787
788static void omap_gpio_free(struct gpio_chip *chip, unsigned offset)
789{
790 struct gpio_bank *bank = gpiochip_get_data(chip);
791 unsigned long flags;
792
793 raw_spin_lock_irqsave(&bank->lock, flags);
794 bank->mod_usage &= ~(BIT(offset));
795 if (!LINE_USED(bank->irq_usage, offset)) {
796 omap_set_gpio_direction(bank, offset, 1);
797 omap_clear_gpio_debounce(bank, offset);
798 }
799 omap_disable_gpio_module(bank, offset);
800 raw_spin_unlock_irqrestore(&bank->lock, flags);
801
802 pm_runtime_put(chip->parent);
803}
804
805static int omap_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
806{
807 struct gpio_bank *bank = gpiochip_get_data(chip);
808
809 if (readl_relaxed(bank->base + bank->regs->direction) & BIT(offset))
810 return GPIO_LINE_DIRECTION_IN;
811
812 return GPIO_LINE_DIRECTION_OUT;
813}
814
815static int omap_gpio_input(struct gpio_chip *chip, unsigned offset)
816{
817 struct gpio_bank *bank;
818 unsigned long flags;
819
820 bank = gpiochip_get_data(chip);
821 raw_spin_lock_irqsave(&bank->lock, flags);
822 omap_set_gpio_direction(bank, offset, 1);
823 raw_spin_unlock_irqrestore(&bank->lock, flags);
824 return 0;
825}
826
827static int omap_gpio_get(struct gpio_chip *chip, unsigned offset)
828{
829 struct gpio_bank *bank = gpiochip_get_data(chip);
830 void __iomem *reg;
831
832 if (omap_gpio_is_input(bank, offset))
833 reg = bank->base + bank->regs->datain;
834 else
835 reg = bank->base + bank->regs->dataout;
836
837 return (readl_relaxed(reg) & BIT(offset)) != 0;
838}
839
840static int omap_gpio_output(struct gpio_chip *chip, unsigned offset, int value)
841{
842 struct gpio_bank *bank;
843 unsigned long flags;
844
845 bank = gpiochip_get_data(chip);
846 raw_spin_lock_irqsave(&bank->lock, flags);
847 bank->set_dataout(bank, offset, value);
848 omap_set_gpio_direction(bank, offset, 0);
849 raw_spin_unlock_irqrestore(&bank->lock, flags);
850 return 0;
851}
852
853static int omap_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,
854 unsigned long *bits)
855{
856 struct gpio_bank *bank = gpiochip_get_data(chip);
857 void __iomem *base = bank->base;
858 u32 direction, m, val = 0;
859
860 direction = readl_relaxed(base + bank->regs->direction);
861
862 m = direction & *mask;
863 if (m)
864 val |= readl_relaxed(base + bank->regs->datain) & m;
865
866 m = ~direction & *mask;
867 if (m)
868 val |= readl_relaxed(base + bank->regs->dataout) & m;
869
870 *bits = val;
871
872 return 0;
873}
874
875static int omap_gpio_debounce(struct gpio_chip *chip, unsigned offset,
876 unsigned debounce)
877{
878 struct gpio_bank *bank;
879 unsigned long flags;
880 int ret;
881
882 bank = gpiochip_get_data(chip);
883
884 raw_spin_lock_irqsave(&bank->lock, flags);
885 ret = omap2_set_gpio_debounce(bank, offset, debounce);
886 raw_spin_unlock_irqrestore(&bank->lock, flags);
887
888 if (ret)
889 dev_info(chip->parent,
890 "Could not set line %u debounce to %u microseconds (%d)",
891 offset, debounce, ret);
892
893 return ret;
894}
895
896static int omap_gpio_set_config(struct gpio_chip *chip, unsigned offset,
897 unsigned long config)
898{
899 u32 debounce;
900 int ret = -ENOTSUPP;
901
902 switch (pinconf_to_config_param(config)) {
903 case PIN_CONFIG_BIAS_DISABLE:
904 case PIN_CONFIG_BIAS_PULL_UP:
905 case PIN_CONFIG_BIAS_PULL_DOWN:
906 ret = gpiochip_generic_config(chip, offset, config);
907 break;
908 case PIN_CONFIG_INPUT_DEBOUNCE:
909 debounce = pinconf_to_config_argument(config);
910 ret = omap_gpio_debounce(chip, offset, debounce);
911 break;
912 default:
913 break;
914 }
915
916 return ret;
917}
918
919static void omap_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
920{
921 struct gpio_bank *bank;
922 unsigned long flags;
923
924 bank = gpiochip_get_data(chip);
925 raw_spin_lock_irqsave(&bank->lock, flags);
926 bank->set_dataout(bank, offset, value);
927 raw_spin_unlock_irqrestore(&bank->lock, flags);
928}
929
930static void omap_gpio_set_multiple(struct gpio_chip *chip, unsigned long *mask,
931 unsigned long *bits)
932{
933 struct gpio_bank *bank = gpiochip_get_data(chip);
934 void __iomem *reg = bank->base + bank->regs->dataout;
935 unsigned long flags;
936 u32 l;
937
938 raw_spin_lock_irqsave(&bank->lock, flags);
939 l = (readl_relaxed(reg) & ~*mask) | (*bits & *mask);
940 writel_relaxed(l, reg);
941 bank->context.dataout = l;
942 raw_spin_unlock_irqrestore(&bank->lock, flags);
943}
944
945/*---------------------------------------------------------------------*/
946
947static void omap_gpio_show_rev(struct gpio_bank *bank)
948{
949 static bool called;
950 u32 rev;
951
952 if (called || bank->regs->revision == USHRT_MAX)
953 return;
954
955 rev = readw_relaxed(bank->base + bank->regs->revision);
956 pr_info("OMAP GPIO hardware version %d.%d\n",
957 (rev >> 4) & 0x0f, rev & 0x0f);
958
959 called = true;
960}
961
962static void omap_gpio_mod_init(struct gpio_bank *bank)
963{
964 void __iomem *base = bank->base;
965 u32 l = 0xffffffff;
966
967 if (bank->width == 16)
968 l = 0xffff;
969
970 if (bank->is_mpuio) {
971 writel_relaxed(l, bank->base + bank->regs->irqenable);
972 return;
973 }
974
975 omap_gpio_rmw(base + bank->regs->irqenable, l,
976 bank->regs->irqenable_inv);
977 omap_gpio_rmw(base + bank->regs->irqstatus, l,
978 !bank->regs->irqenable_inv);
979 if (bank->regs->debounce_en)
980 writel_relaxed(0, base + bank->regs->debounce_en);
981
982 /* Save OE default value (0xffffffff) in the context */
983 bank->context.oe = readl_relaxed(bank->base + bank->regs->direction);
984 /* Initialize interface clk ungated, module enabled */
985 if (bank->regs->ctrl)
986 writel_relaxed(0, base + bank->regs->ctrl);
987}
988
989static int omap_gpio_chip_init(struct gpio_bank *bank, struct irq_chip *irqc,
990 struct device *pm_dev)
991{
992 struct gpio_irq_chip *irq;
993 static int gpio;
994 const char *label;
995 int irq_base = 0;
996 int ret;
997
998 /*
999 * REVISIT eventually switch from OMAP-specific gpio structs
1000 * over to the generic ones
1001 */
1002 bank->chip.request = omap_gpio_request;
1003 bank->chip.free = omap_gpio_free;
1004 bank->chip.get_direction = omap_gpio_get_direction;
1005 bank->chip.direction_input = omap_gpio_input;
1006 bank->chip.get = omap_gpio_get;
1007 bank->chip.get_multiple = omap_gpio_get_multiple;
1008 bank->chip.direction_output = omap_gpio_output;
1009 bank->chip.set_config = omap_gpio_set_config;
1010 bank->chip.set = omap_gpio_set;
1011 bank->chip.set_multiple = omap_gpio_set_multiple;
1012 if (bank->is_mpuio) {
1013 bank->chip.label = "mpuio";
1014 if (bank->regs->wkup_en)
1015 bank->chip.parent = &omap_mpuio_device.dev;
1016 bank->chip.base = OMAP_MPUIO(0);
1017 } else {
1018 label = devm_kasprintf(bank->chip.parent, GFP_KERNEL, "gpio-%d-%d",
1019 gpio, gpio + bank->width - 1);
1020 if (!label)
1021 return -ENOMEM;
1022 bank->chip.label = label;
1023 bank->chip.base = gpio;
1024 }
1025 bank->chip.ngpio = bank->width;
1026
1027#ifdef CONFIG_ARCH_OMAP1
1028 /*
1029 * REVISIT: Once we have OMAP1 supporting SPARSE_IRQ, we can drop
1030 * irq_alloc_descs() since a base IRQ offset will no longer be needed.
1031 */
1032 irq_base = devm_irq_alloc_descs(bank->chip.parent,
1033 -1, 0, bank->width, 0);
1034 if (irq_base < 0) {
1035 dev_err(bank->chip.parent, "Couldn't allocate IRQ numbers\n");
1036 return -ENODEV;
1037 }
1038#endif
1039
1040 /* MPUIO is a bit different, reading IRQ status clears it */
1041 if (bank->is_mpuio && !bank->regs->wkup_en)
1042 irqc->irq_set_wake = NULL;
1043
1044 irq = &bank->chip.irq;
1045 irq->chip = irqc;
1046 irq->handler = handle_bad_irq;
1047 irq->default_type = IRQ_TYPE_NONE;
1048 irq->num_parents = 1;
1049 irq->parents = &bank->irq;
1050 irq->first = irq_base;
1051
1052 ret = gpiochip_add_data(&bank->chip, bank);
1053 if (ret)
1054 return dev_err_probe(bank->chip.parent, ret, "Could not register gpio chip\n");
1055
1056 irq_domain_set_pm_device(bank->chip.irq.domain, pm_dev);
1057 ret = devm_request_irq(bank->chip.parent, bank->irq,
1058 omap_gpio_irq_handler,
1059 0, dev_name(bank->chip.parent), bank);
1060 if (ret)
1061 gpiochip_remove(&bank->chip);
1062
1063 if (!bank->is_mpuio)
1064 gpio += bank->width;
1065
1066 return ret;
1067}
1068
1069static void omap_gpio_init_context(struct gpio_bank *p)
1070{
1071 const struct omap_gpio_reg_offs *regs = p->regs;
1072 void __iomem *base = p->base;
1073
1074 p->context.sysconfig = readl_relaxed(base + regs->sysconfig);
1075 p->context.ctrl = readl_relaxed(base + regs->ctrl);
1076 p->context.oe = readl_relaxed(base + regs->direction);
1077 p->context.wake_en = readl_relaxed(base + regs->wkup_en);
1078 p->context.leveldetect0 = readl_relaxed(base + regs->leveldetect0);
1079 p->context.leveldetect1 = readl_relaxed(base + regs->leveldetect1);
1080 p->context.risingdetect = readl_relaxed(base + regs->risingdetect);
1081 p->context.fallingdetect = readl_relaxed(base + regs->fallingdetect);
1082 p->context.irqenable1 = readl_relaxed(base + regs->irqenable);
1083 p->context.irqenable2 = readl_relaxed(base + regs->irqenable2);
1084 p->context.dataout = readl_relaxed(base + regs->dataout);
1085
1086 p->context_valid = true;
1087}
1088
1089static void omap_gpio_restore_context(struct gpio_bank *bank)
1090{
1091 const struct omap_gpio_reg_offs *regs = bank->regs;
1092 void __iomem *base = bank->base;
1093
1094 writel_relaxed(bank->context.sysconfig, base + regs->sysconfig);
1095 writel_relaxed(bank->context.wake_en, base + regs->wkup_en);
1096 writel_relaxed(bank->context.ctrl, base + regs->ctrl);
1097 writel_relaxed(bank->context.leveldetect0, base + regs->leveldetect0);
1098 writel_relaxed(bank->context.leveldetect1, base + regs->leveldetect1);
1099 writel_relaxed(bank->context.risingdetect, base + regs->risingdetect);
1100 writel_relaxed(bank->context.fallingdetect, base + regs->fallingdetect);
1101 writel_relaxed(bank->context.dataout, base + regs->dataout);
1102 writel_relaxed(bank->context.oe, base + regs->direction);
1103
1104 if (bank->dbck_enable_mask) {
1105 writel_relaxed(bank->context.debounce, base + regs->debounce);
1106 writel_relaxed(bank->context.debounce_en,
1107 base + regs->debounce_en);
1108 }
1109
1110 writel_relaxed(bank->context.irqenable1, base + regs->irqenable);
1111 writel_relaxed(bank->context.irqenable2, base + regs->irqenable2);
1112}
1113
1114static void omap_gpio_idle(struct gpio_bank *bank, bool may_lose_context)
1115{
1116 struct device *dev = bank->chip.parent;
1117 void __iomem *base = bank->base;
1118 u32 mask, nowake;
1119
1120 bank->saved_datain = readl_relaxed(base + bank->regs->datain);
1121
1122 /* Save syconfig, it's runtime value can be different from init value */
1123 if (bank->loses_context)
1124 bank->context.sysconfig = readl_relaxed(base + bank->regs->sysconfig);
1125
1126 if (!bank->enabled_non_wakeup_gpios)
1127 goto update_gpio_context_count;
1128
1129 /* Check for pending EDGE_FALLING, ignore EDGE_BOTH */
1130 mask = bank->enabled_non_wakeup_gpios & bank->context.fallingdetect;
1131 mask &= ~bank->context.risingdetect;
1132 bank->saved_datain |= mask;
1133
1134 /* Check for pending EDGE_RISING, ignore EDGE_BOTH */
1135 mask = bank->enabled_non_wakeup_gpios & bank->context.risingdetect;
1136 mask &= ~bank->context.fallingdetect;
1137 bank->saved_datain &= ~mask;
1138
1139 if (!may_lose_context)
1140 goto update_gpio_context_count;
1141
1142 /*
1143 * If going to OFF, remove triggering for all wkup domain
1144 * non-wakeup GPIOs. Otherwise spurious IRQs will be
1145 * generated. See OMAP2420 Errata item 1.101.
1146 */
1147 if (!bank->loses_context && bank->enabled_non_wakeup_gpios) {
1148 nowake = bank->enabled_non_wakeup_gpios;
1149 omap_gpio_rmw(base + bank->regs->fallingdetect, nowake, ~nowake);
1150 omap_gpio_rmw(base + bank->regs->risingdetect, nowake, ~nowake);
1151 }
1152
1153update_gpio_context_count:
1154 if (bank->get_context_loss_count)
1155 bank->context_loss_count =
1156 bank->get_context_loss_count(dev);
1157
1158 omap_gpio_dbck_disable(bank);
1159}
1160
1161static void omap_gpio_unidle(struct gpio_bank *bank)
1162{
1163 struct device *dev = bank->chip.parent;
1164 u32 l = 0, gen, gen0, gen1;
1165 int c;
1166
1167 /*
1168 * On the first resume during the probe, the context has not
1169 * been initialised and so initialise it now. Also initialise
1170 * the context loss count.
1171 */
1172 if (bank->loses_context && !bank->context_valid) {
1173 omap_gpio_init_context(bank);
1174
1175 if (bank->get_context_loss_count)
1176 bank->context_loss_count =
1177 bank->get_context_loss_count(dev);
1178 }
1179
1180 omap_gpio_dbck_enable(bank);
1181
1182 if (bank->loses_context) {
1183 if (!bank->get_context_loss_count) {
1184 omap_gpio_restore_context(bank);
1185 } else {
1186 c = bank->get_context_loss_count(dev);
1187 if (c != bank->context_loss_count) {
1188 omap_gpio_restore_context(bank);
1189 } else {
1190 return;
1191 }
1192 }
1193 } else {
1194 /* Restore changes done for OMAP2420 errata 1.101 */
1195 writel_relaxed(bank->context.fallingdetect,
1196 bank->base + bank->regs->fallingdetect);
1197 writel_relaxed(bank->context.risingdetect,
1198 bank->base + bank->regs->risingdetect);
1199 }
1200
1201 l = readl_relaxed(bank->base + bank->regs->datain);
1202
1203 /*
1204 * Check if any of the non-wakeup interrupt GPIOs have changed
1205 * state. If so, generate an IRQ by software. This is
1206 * horribly racy, but it's the best we can do to work around
1207 * this silicon bug.
1208 */
1209 l ^= bank->saved_datain;
1210 l &= bank->enabled_non_wakeup_gpios;
1211
1212 /*
1213 * No need to generate IRQs for the rising edge for gpio IRQs
1214 * configured with falling edge only; and vice versa.
1215 */
1216 gen0 = l & bank->context.fallingdetect;
1217 gen0 &= bank->saved_datain;
1218
1219 gen1 = l & bank->context.risingdetect;
1220 gen1 &= ~(bank->saved_datain);
1221
1222 /* FIXME: Consider GPIO IRQs with level detections properly! */
1223 gen = l & (~(bank->context.fallingdetect) &
1224 ~(bank->context.risingdetect));
1225 /* Consider all GPIO IRQs needed to be updated */
1226 gen |= gen0 | gen1;
1227
1228 if (gen) {
1229 u32 old0, old1;
1230
1231 old0 = readl_relaxed(bank->base + bank->regs->leveldetect0);
1232 old1 = readl_relaxed(bank->base + bank->regs->leveldetect1);
1233
1234 if (!bank->regs->irqstatus_raw0) {
1235 writel_relaxed(old0 | gen, bank->base +
1236 bank->regs->leveldetect0);
1237 writel_relaxed(old1 | gen, bank->base +
1238 bank->regs->leveldetect1);
1239 }
1240
1241 if (bank->regs->irqstatus_raw0) {
1242 writel_relaxed(old0 | l, bank->base +
1243 bank->regs->leveldetect0);
1244 writel_relaxed(old1 | l, bank->base +
1245 bank->regs->leveldetect1);
1246 }
1247 writel_relaxed(old0, bank->base + bank->regs->leveldetect0);
1248 writel_relaxed(old1, bank->base + bank->regs->leveldetect1);
1249 }
1250}
1251
1252static int gpio_omap_cpu_notifier(struct notifier_block *nb,
1253 unsigned long cmd, void *v)
1254{
1255 struct gpio_bank *bank;
1256 unsigned long flags;
1257 int ret = NOTIFY_OK;
1258 u32 isr, mask;
1259
1260 bank = container_of(nb, struct gpio_bank, nb);
1261
1262 raw_spin_lock_irqsave(&bank->lock, flags);
1263 if (bank->is_suspended)
1264 goto out_unlock;
1265
1266 switch (cmd) {
1267 case CPU_CLUSTER_PM_ENTER:
1268 mask = omap_get_gpio_irqbank_mask(bank);
1269 isr = readl_relaxed(bank->base + bank->regs->irqstatus) & mask;
1270 if (isr) {
1271 ret = NOTIFY_BAD;
1272 break;
1273 }
1274 omap_gpio_idle(bank, true);
1275 break;
1276 case CPU_CLUSTER_PM_ENTER_FAILED:
1277 case CPU_CLUSTER_PM_EXIT:
1278 omap_gpio_unidle(bank);
1279 break;
1280 }
1281
1282out_unlock:
1283 raw_spin_unlock_irqrestore(&bank->lock, flags);
1284
1285 return ret;
1286}
1287
1288static const struct omap_gpio_reg_offs omap2_gpio_regs = {
1289 .revision = OMAP24XX_GPIO_REVISION,
1290 .sysconfig = OMAP24XX_GPIO_SYSCONFIG,
1291 .direction = OMAP24XX_GPIO_OE,
1292 .datain = OMAP24XX_GPIO_DATAIN,
1293 .dataout = OMAP24XX_GPIO_DATAOUT,
1294 .set_dataout = OMAP24XX_GPIO_SETDATAOUT,
1295 .clr_dataout = OMAP24XX_GPIO_CLEARDATAOUT,
1296 .irqstatus = OMAP24XX_GPIO_IRQSTATUS1,
1297 .irqstatus2 = OMAP24XX_GPIO_IRQSTATUS2,
1298 .irqenable = OMAP24XX_GPIO_IRQENABLE1,
1299 .irqenable2 = OMAP24XX_GPIO_IRQENABLE2,
1300 .set_irqenable = OMAP24XX_GPIO_SETIRQENABLE1,
1301 .clr_irqenable = OMAP24XX_GPIO_CLEARIRQENABLE1,
1302 .debounce = OMAP24XX_GPIO_DEBOUNCE_VAL,
1303 .debounce_en = OMAP24XX_GPIO_DEBOUNCE_EN,
1304 .ctrl = OMAP24XX_GPIO_CTRL,
1305 .wkup_en = OMAP24XX_GPIO_WAKE_EN,
1306 .leveldetect0 = OMAP24XX_GPIO_LEVELDETECT0,
1307 .leveldetect1 = OMAP24XX_GPIO_LEVELDETECT1,
1308 .risingdetect = OMAP24XX_GPIO_RISINGDETECT,
1309 .fallingdetect = OMAP24XX_GPIO_FALLINGDETECT,
1310};
1311
1312static const struct omap_gpio_reg_offs omap4_gpio_regs = {
1313 .revision = OMAP4_GPIO_REVISION,
1314 .sysconfig = OMAP4_GPIO_SYSCONFIG,
1315 .direction = OMAP4_GPIO_OE,
1316 .datain = OMAP4_GPIO_DATAIN,
1317 .dataout = OMAP4_GPIO_DATAOUT,
1318 .set_dataout = OMAP4_GPIO_SETDATAOUT,
1319 .clr_dataout = OMAP4_GPIO_CLEARDATAOUT,
1320 .irqstatus = OMAP4_GPIO_IRQSTATUS0,
1321 .irqstatus2 = OMAP4_GPIO_IRQSTATUS1,
1322 .irqstatus_raw0 = OMAP4_GPIO_IRQSTATUSRAW0,
1323 .irqstatus_raw1 = OMAP4_GPIO_IRQSTATUSRAW1,
1324 .irqenable = OMAP4_GPIO_IRQSTATUSSET0,
1325 .irqenable2 = OMAP4_GPIO_IRQSTATUSSET1,
1326 .set_irqenable = OMAP4_GPIO_IRQSTATUSSET0,
1327 .clr_irqenable = OMAP4_GPIO_IRQSTATUSCLR0,
1328 .debounce = OMAP4_GPIO_DEBOUNCINGTIME,
1329 .debounce_en = OMAP4_GPIO_DEBOUNCENABLE,
1330 .ctrl = OMAP4_GPIO_CTRL,
1331 .wkup_en = OMAP4_GPIO_IRQWAKEN0,
1332 .leveldetect0 = OMAP4_GPIO_LEVELDETECT0,
1333 .leveldetect1 = OMAP4_GPIO_LEVELDETECT1,
1334 .risingdetect = OMAP4_GPIO_RISINGDETECT,
1335 .fallingdetect = OMAP4_GPIO_FALLINGDETECT,
1336};
1337
1338static const struct omap_gpio_platform_data omap2_pdata = {
1339 .regs = &omap2_gpio_regs,
1340 .bank_width = 32,
1341 .dbck_flag = false,
1342};
1343
1344static const struct omap_gpio_platform_data omap3_pdata = {
1345 .regs = &omap2_gpio_regs,
1346 .bank_width = 32,
1347 .dbck_flag = true,
1348};
1349
1350static const struct omap_gpio_platform_data omap4_pdata = {
1351 .regs = &omap4_gpio_regs,
1352 .bank_width = 32,
1353 .dbck_flag = true,
1354};
1355
1356static const struct of_device_id omap_gpio_match[] = {
1357 {
1358 .compatible = "ti,omap4-gpio",
1359 .data = &omap4_pdata,
1360 },
1361 {
1362 .compatible = "ti,omap3-gpio",
1363 .data = &omap3_pdata,
1364 },
1365 {
1366 .compatible = "ti,omap2-gpio",
1367 .data = &omap2_pdata,
1368 },
1369 { },
1370};
1371MODULE_DEVICE_TABLE(of, omap_gpio_match);
1372
1373static int omap_gpio_probe(struct platform_device *pdev)
1374{
1375 struct device *dev = &pdev->dev;
1376 struct device_node *node = dev->of_node;
1377 const struct omap_gpio_platform_data *pdata;
1378 struct gpio_bank *bank;
1379 struct irq_chip *irqc;
1380 int ret;
1381
1382 pdata = device_get_match_data(dev);
1383
1384 pdata = pdata ?: dev_get_platdata(dev);
1385 if (!pdata)
1386 return -EINVAL;
1387
1388 bank = devm_kzalloc(dev, sizeof(*bank), GFP_KERNEL);
1389 if (!bank)
1390 return -ENOMEM;
1391
1392 irqc = devm_kzalloc(dev, sizeof(*irqc), GFP_KERNEL);
1393 if (!irqc)
1394 return -ENOMEM;
1395
1396 irqc->irq_startup = omap_gpio_irq_startup,
1397 irqc->irq_shutdown = omap_gpio_irq_shutdown,
1398 irqc->irq_ack = dummy_irq_chip.irq_ack,
1399 irqc->irq_mask = omap_gpio_mask_irq,
1400 irqc->irq_unmask = omap_gpio_unmask_irq,
1401 irqc->irq_set_type = omap_gpio_irq_type,
1402 irqc->irq_set_wake = omap_gpio_wake_enable,
1403 irqc->irq_bus_lock = omap_gpio_irq_bus_lock,
1404 irqc->irq_bus_sync_unlock = gpio_irq_bus_sync_unlock,
1405 irqc->name = dev_name(&pdev->dev);
1406 irqc->flags = IRQCHIP_MASK_ON_SUSPEND;
1407
1408 bank->irq = platform_get_irq(pdev, 0);
1409 if (bank->irq <= 0) {
1410 if (!bank->irq)
1411 bank->irq = -ENXIO;
1412 return dev_err_probe(dev, bank->irq, "can't get irq resource\n");
1413 }
1414
1415 bank->chip.parent = dev;
1416 bank->chip.owner = THIS_MODULE;
1417 bank->dbck_flag = pdata->dbck_flag;
1418 bank->stride = pdata->bank_stride;
1419 bank->width = pdata->bank_width;
1420 bank->is_mpuio = pdata->is_mpuio;
1421 bank->non_wakeup_gpios = pdata->non_wakeup_gpios;
1422 bank->regs = pdata->regs;
1423
1424 if (node) {
1425 if (!of_property_read_bool(node, "ti,gpio-always-on"))
1426 bank->loses_context = true;
1427 } else {
1428 bank->loses_context = pdata->loses_context;
1429
1430 if (bank->loses_context)
1431 bank->get_context_loss_count =
1432 pdata->get_context_loss_count;
1433 }
1434
1435 if (bank->regs->set_dataout && bank->regs->clr_dataout)
1436 bank->set_dataout = omap_set_gpio_dataout_reg;
1437 else
1438 bank->set_dataout = omap_set_gpio_dataout_mask;
1439
1440 raw_spin_lock_init(&bank->lock);
1441 raw_spin_lock_init(&bank->wa_lock);
1442
1443 /* Static mapping, never released */
1444 bank->base = devm_platform_ioremap_resource(pdev, 0);
1445 if (IS_ERR(bank->base)) {
1446 return PTR_ERR(bank->base);
1447 }
1448
1449 if (bank->dbck_flag) {
1450 bank->dbck = devm_clk_get(dev, "dbclk");
1451 if (IS_ERR(bank->dbck)) {
1452 dev_err(dev,
1453 "Could not get gpio dbck. Disable debounce\n");
1454 bank->dbck_flag = false;
1455 } else {
1456 clk_prepare(bank->dbck);
1457 }
1458 }
1459
1460 platform_set_drvdata(pdev, bank);
1461
1462 pm_runtime_enable(dev);
1463 pm_runtime_get_sync(dev);
1464
1465 if (bank->is_mpuio)
1466 omap_mpuio_init(bank);
1467
1468 omap_gpio_mod_init(bank);
1469
1470 ret = omap_gpio_chip_init(bank, irqc, dev);
1471 if (ret) {
1472 pm_runtime_put_sync(dev);
1473 pm_runtime_disable(dev);
1474 if (bank->dbck_flag)
1475 clk_unprepare(bank->dbck);
1476 return ret;
1477 }
1478
1479 omap_gpio_show_rev(bank);
1480
1481 bank->nb.notifier_call = gpio_omap_cpu_notifier;
1482 cpu_pm_register_notifier(&bank->nb);
1483
1484 pm_runtime_put(dev);
1485
1486 return 0;
1487}
1488
1489static int omap_gpio_remove(struct platform_device *pdev)
1490{
1491 struct gpio_bank *bank = platform_get_drvdata(pdev);
1492
1493 cpu_pm_unregister_notifier(&bank->nb);
1494 gpiochip_remove(&bank->chip);
1495 pm_runtime_disable(&pdev->dev);
1496 if (bank->dbck_flag)
1497 clk_unprepare(bank->dbck);
1498
1499 return 0;
1500}
1501
1502static int __maybe_unused omap_gpio_runtime_suspend(struct device *dev)
1503{
1504 struct gpio_bank *bank = dev_get_drvdata(dev);
1505 unsigned long flags;
1506
1507 raw_spin_lock_irqsave(&bank->lock, flags);
1508 omap_gpio_idle(bank, true);
1509 bank->is_suspended = true;
1510 raw_spin_unlock_irqrestore(&bank->lock, flags);
1511
1512 return 0;
1513}
1514
1515static int __maybe_unused omap_gpio_runtime_resume(struct device *dev)
1516{
1517 struct gpio_bank *bank = dev_get_drvdata(dev);
1518 unsigned long flags;
1519
1520 raw_spin_lock_irqsave(&bank->lock, flags);
1521 omap_gpio_unidle(bank);
1522 bank->is_suspended = false;
1523 raw_spin_unlock_irqrestore(&bank->lock, flags);
1524
1525 return 0;
1526}
1527
1528static int __maybe_unused omap_gpio_suspend(struct device *dev)
1529{
1530 struct gpio_bank *bank = dev_get_drvdata(dev);
1531
1532 if (bank->is_suspended)
1533 return 0;
1534
1535 bank->needs_resume = 1;
1536
1537 return omap_gpio_runtime_suspend(dev);
1538}
1539
1540static int __maybe_unused omap_gpio_resume(struct device *dev)
1541{
1542 struct gpio_bank *bank = dev_get_drvdata(dev);
1543
1544 if (!bank->needs_resume)
1545 return 0;
1546
1547 bank->needs_resume = 0;
1548
1549 return omap_gpio_runtime_resume(dev);
1550}
1551
1552static const struct dev_pm_ops gpio_pm_ops = {
1553 SET_RUNTIME_PM_OPS(omap_gpio_runtime_suspend, omap_gpio_runtime_resume,
1554 NULL)
1555 SET_LATE_SYSTEM_SLEEP_PM_OPS(omap_gpio_suspend, omap_gpio_resume)
1556};
1557
1558static struct platform_driver omap_gpio_driver = {
1559 .probe = omap_gpio_probe,
1560 .remove = omap_gpio_remove,
1561 .driver = {
1562 .name = "omap_gpio",
1563 .pm = &gpio_pm_ops,
1564 .of_match_table = omap_gpio_match,
1565 },
1566};
1567
1568/*
1569 * gpio driver register needs to be done before
1570 * machine_init functions access gpio APIs.
1571 * Hence omap_gpio_drv_reg() is a postcore_initcall.
1572 */
1573static int __init omap_gpio_drv_reg(void)
1574{
1575 return platform_driver_register(&omap_gpio_driver);
1576}
1577postcore_initcall(omap_gpio_drv_reg);
1578
1579static void __exit omap_gpio_exit(void)
1580{
1581 platform_driver_unregister(&omap_gpio_driver);
1582}
1583module_exit(omap_gpio_exit);
1584
1585MODULE_DESCRIPTION("omap gpio driver");
1586MODULE_ALIAS("platform:gpio-omap");
1587MODULE_LICENSE("GPL v2");