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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/*
2 * Support functions for OMAP GPIO
3 *
4 * Copyright (C) 2003-2005 Nokia Corporation
5 * Written by Juha Yrjölä <juha.yrjola@nokia.com>
6 *
7 * Copyright (C) 2009 Texas Instruments
8 * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 */
14
15#include <linux/init.h>
16#include <linux/module.h>
17#include <linux/interrupt.h>
18#include <linux/syscore_ops.h>
19#include <linux/err.h>
20#include <linux/clk.h>
21#include <linux/io.h>
22#include <linux/device.h>
23#include <linux/pm_runtime.h>
24#include <linux/pm.h>
25#include <linux/of.h>
26#include <linux/of_device.h>
27#include <linux/gpio.h>
28#include <linux/bitops.h>
29#include <linux/platform_data/gpio-omap.h>
30
31#define OFF_MODE 1
32#define OMAP4_GPIO_DEBOUNCINGTIME_MASK 0xFF
33
34static LIST_HEAD(omap_gpio_list);
35
36struct gpio_regs {
37 u32 irqenable1;
38 u32 irqenable2;
39 u32 wake_en;
40 u32 ctrl;
41 u32 oe;
42 u32 leveldetect0;
43 u32 leveldetect1;
44 u32 risingdetect;
45 u32 fallingdetect;
46 u32 dataout;
47 u32 debounce;
48 u32 debounce_en;
49};
50
51struct gpio_bank {
52 struct list_head node;
53 void __iomem *base;
54 int irq;
55 u32 non_wakeup_gpios;
56 u32 enabled_non_wakeup_gpios;
57 struct gpio_regs context;
58 u32 saved_datain;
59 u32 level_mask;
60 u32 toggle_mask;
61 raw_spinlock_t lock;
62 raw_spinlock_t wa_lock;
63 struct gpio_chip chip;
64 struct clk *dbck;
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 int power_mode;
77 bool workaround_enabled;
78
79 void (*set_dataout)(struct gpio_bank *bank, unsigned gpio, int enable);
80 int (*get_context_loss_count)(struct device *dev);
81
82 struct omap_gpio_reg_offs *regs;
83};
84
85#define GPIO_MOD_CTRL_BIT BIT(0)
86
87#define BANK_USED(bank) (bank->mod_usage || bank->irq_usage)
88#define LINE_USED(line, offset) (line & (BIT(offset)))
89
90static void omap_gpio_unmask_irq(struct irq_data *d);
91
92static inline struct gpio_bank *omap_irq_data_get_bank(struct irq_data *d)
93{
94 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
95 return gpiochip_get_data(chip);
96}
97
98static void omap_set_gpio_direction(struct gpio_bank *bank, int gpio,
99 int is_input)
100{
101 void __iomem *reg = bank->base;
102 u32 l;
103
104 reg += bank->regs->direction;
105 l = readl_relaxed(reg);
106 if (is_input)
107 l |= BIT(gpio);
108 else
109 l &= ~(BIT(gpio));
110 writel_relaxed(l, reg);
111 bank->context.oe = l;
112}
113
114
115/* set data out value using dedicate set/clear register */
116static void omap_set_gpio_dataout_reg(struct gpio_bank *bank, unsigned offset,
117 int enable)
118{
119 void __iomem *reg = bank->base;
120 u32 l = BIT(offset);
121
122 if (enable) {
123 reg += bank->regs->set_dataout;
124 bank->context.dataout |= l;
125 } else {
126 reg += bank->regs->clr_dataout;
127 bank->context.dataout &= ~l;
128 }
129
130 writel_relaxed(l, reg);
131}
132
133/* set data out value using mask register */
134static void omap_set_gpio_dataout_mask(struct gpio_bank *bank, unsigned offset,
135 int enable)
136{
137 void __iomem *reg = bank->base + bank->regs->dataout;
138 u32 gpio_bit = BIT(offset);
139 u32 l;
140
141 l = readl_relaxed(reg);
142 if (enable)
143 l |= gpio_bit;
144 else
145 l &= ~gpio_bit;
146 writel_relaxed(l, reg);
147 bank->context.dataout = l;
148}
149
150static int omap_get_gpio_datain(struct gpio_bank *bank, int offset)
151{
152 void __iomem *reg = bank->base + bank->regs->datain;
153
154 return (readl_relaxed(reg) & (BIT(offset))) != 0;
155}
156
157static int omap_get_gpio_dataout(struct gpio_bank *bank, int offset)
158{
159 void __iomem *reg = bank->base + bank->regs->dataout;
160
161 return (readl_relaxed(reg) & (BIT(offset))) != 0;
162}
163
164static inline void omap_gpio_rmw(void __iomem *base, u32 reg, u32 mask, bool set)
165{
166 int l = readl_relaxed(base + reg);
167
168 if (set)
169 l |= mask;
170 else
171 l &= ~mask;
172
173 writel_relaxed(l, base + reg);
174}
175
176static inline void omap_gpio_dbck_enable(struct gpio_bank *bank)
177{
178 if (bank->dbck_enable_mask && !bank->dbck_enabled) {
179 clk_enable(bank->dbck);
180 bank->dbck_enabled = true;
181
182 writel_relaxed(bank->dbck_enable_mask,
183 bank->base + bank->regs->debounce_en);
184 }
185}
186
187static inline void omap_gpio_dbck_disable(struct gpio_bank *bank)
188{
189 if (bank->dbck_enable_mask && bank->dbck_enabled) {
190 /*
191 * Disable debounce before cutting it's clock. If debounce is
192 * enabled but the clock is not, GPIO module seems to be unable
193 * to detect events and generate interrupts at least on OMAP3.
194 */
195 writel_relaxed(0, bank->base + bank->regs->debounce_en);
196
197 clk_disable(bank->dbck);
198 bank->dbck_enabled = false;
199 }
200}
201
202/**
203 * omap2_set_gpio_debounce - low level gpio debounce time
204 * @bank: the gpio bank we're acting upon
205 * @offset: the gpio number on this @bank
206 * @debounce: debounce time to use
207 *
208 * OMAP's debounce time is in 31us steps
209 * <debounce time> = (GPIO_DEBOUNCINGTIME[7:0].DEBOUNCETIME + 1) x 31
210 * so we need to convert and round up to the closest unit.
211 */
212static void omap2_set_gpio_debounce(struct gpio_bank *bank, unsigned offset,
213 unsigned debounce)
214{
215 void __iomem *reg;
216 u32 val;
217 u32 l;
218 bool enable = !!debounce;
219
220 if (!bank->dbck_flag)
221 return;
222
223 if (enable) {
224 debounce = DIV_ROUND_UP(debounce, 31) - 1;
225 debounce &= OMAP4_GPIO_DEBOUNCINGTIME_MASK;
226 }
227
228 l = BIT(offset);
229
230 clk_enable(bank->dbck);
231 reg = bank->base + bank->regs->debounce;
232 writel_relaxed(debounce, reg);
233
234 reg = bank->base + bank->regs->debounce_en;
235 val = readl_relaxed(reg);
236
237 if (enable)
238 val |= l;
239 else
240 val &= ~l;
241 bank->dbck_enable_mask = val;
242
243 writel_relaxed(val, reg);
244 clk_disable(bank->dbck);
245 /*
246 * Enable debounce clock per module.
247 * This call is mandatory because in omap_gpio_request() when
248 * *_runtime_get_sync() is called, _gpio_dbck_enable() within
249 * runtime callbck fails to turn on dbck because dbck_enable_mask
250 * used within _gpio_dbck_enable() is still not initialized at
251 * that point. Therefore we have to enable dbck here.
252 */
253 omap_gpio_dbck_enable(bank);
254 if (bank->dbck_enable_mask) {
255 bank->context.debounce = debounce;
256 bank->context.debounce_en = val;
257 }
258}
259
260/**
261 * omap_clear_gpio_debounce - clear debounce settings for a gpio
262 * @bank: the gpio bank we're acting upon
263 * @offset: the gpio number on this @bank
264 *
265 * If a gpio is using debounce, then clear the debounce enable bit and if
266 * this is the only gpio in this bank using debounce, then clear the debounce
267 * time too. The debounce clock will also be disabled when calling this function
268 * if this is the only gpio in the bank using debounce.
269 */
270static void omap_clear_gpio_debounce(struct gpio_bank *bank, unsigned offset)
271{
272 u32 gpio_bit = BIT(offset);
273
274 if (!bank->dbck_flag)
275 return;
276
277 if (!(bank->dbck_enable_mask & gpio_bit))
278 return;
279
280 bank->dbck_enable_mask &= ~gpio_bit;
281 bank->context.debounce_en &= ~gpio_bit;
282 writel_relaxed(bank->context.debounce_en,
283 bank->base + bank->regs->debounce_en);
284
285 if (!bank->dbck_enable_mask) {
286 bank->context.debounce = 0;
287 writel_relaxed(bank->context.debounce, bank->base +
288 bank->regs->debounce);
289 clk_disable(bank->dbck);
290 bank->dbck_enabled = false;
291 }
292}
293
294static inline void omap_set_gpio_trigger(struct gpio_bank *bank, int gpio,
295 unsigned trigger)
296{
297 void __iomem *base = bank->base;
298 u32 gpio_bit = BIT(gpio);
299
300 omap_gpio_rmw(base, bank->regs->leveldetect0, gpio_bit,
301 trigger & IRQ_TYPE_LEVEL_LOW);
302 omap_gpio_rmw(base, bank->regs->leveldetect1, gpio_bit,
303 trigger & IRQ_TYPE_LEVEL_HIGH);
304 omap_gpio_rmw(base, bank->regs->risingdetect, gpio_bit,
305 trigger & IRQ_TYPE_EDGE_RISING);
306 omap_gpio_rmw(base, bank->regs->fallingdetect, gpio_bit,
307 trigger & IRQ_TYPE_EDGE_FALLING);
308
309 bank->context.leveldetect0 =
310 readl_relaxed(bank->base + bank->regs->leveldetect0);
311 bank->context.leveldetect1 =
312 readl_relaxed(bank->base + bank->regs->leveldetect1);
313 bank->context.risingdetect =
314 readl_relaxed(bank->base + bank->regs->risingdetect);
315 bank->context.fallingdetect =
316 readl_relaxed(bank->base + bank->regs->fallingdetect);
317
318 if (likely(!(bank->non_wakeup_gpios & gpio_bit))) {
319 omap_gpio_rmw(base, bank->regs->wkup_en, gpio_bit, trigger != 0);
320 bank->context.wake_en =
321 readl_relaxed(bank->base + bank->regs->wkup_en);
322 }
323
324 /* This part needs to be executed always for OMAP{34xx, 44xx} */
325 if (!bank->regs->irqctrl) {
326 /* On omap24xx proceed only when valid GPIO bit is set */
327 if (bank->non_wakeup_gpios) {
328 if (!(bank->non_wakeup_gpios & gpio_bit))
329 goto exit;
330 }
331
332 /*
333 * Log the edge gpio and manually trigger the IRQ
334 * after resume if the input level changes
335 * to avoid irq lost during PER RET/OFF mode
336 * Applies for omap2 non-wakeup gpio and all omap3 gpios
337 */
338 if (trigger & IRQ_TYPE_EDGE_BOTH)
339 bank->enabled_non_wakeup_gpios |= gpio_bit;
340 else
341 bank->enabled_non_wakeup_gpios &= ~gpio_bit;
342 }
343
344exit:
345 bank->level_mask =
346 readl_relaxed(bank->base + bank->regs->leveldetect0) |
347 readl_relaxed(bank->base + bank->regs->leveldetect1);
348}
349
350#ifdef CONFIG_ARCH_OMAP1
351/*
352 * This only applies to chips that can't do both rising and falling edge
353 * detection at once. For all other chips, this function is a noop.
354 */
355static void omap_toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio)
356{
357 void __iomem *reg = bank->base;
358 u32 l = 0;
359
360 if (!bank->regs->irqctrl)
361 return;
362
363 reg += bank->regs->irqctrl;
364
365 l = readl_relaxed(reg);
366 if ((l >> gpio) & 1)
367 l &= ~(BIT(gpio));
368 else
369 l |= BIT(gpio);
370
371 writel_relaxed(l, reg);
372}
373#else
374static void omap_toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio) {}
375#endif
376
377static int omap_set_gpio_triggering(struct gpio_bank *bank, int gpio,
378 unsigned trigger)
379{
380 void __iomem *reg = bank->base;
381 void __iomem *base = bank->base;
382 u32 l = 0;
383
384 if (bank->regs->leveldetect0 && bank->regs->wkup_en) {
385 omap_set_gpio_trigger(bank, gpio, trigger);
386 } else if (bank->regs->irqctrl) {
387 reg += bank->regs->irqctrl;
388
389 l = readl_relaxed(reg);
390 if ((trigger & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH)
391 bank->toggle_mask |= BIT(gpio);
392 if (trigger & IRQ_TYPE_EDGE_RISING)
393 l |= BIT(gpio);
394 else if (trigger & IRQ_TYPE_EDGE_FALLING)
395 l &= ~(BIT(gpio));
396 else
397 return -EINVAL;
398
399 writel_relaxed(l, reg);
400 } else if (bank->regs->edgectrl1) {
401 if (gpio & 0x08)
402 reg += bank->regs->edgectrl2;
403 else
404 reg += bank->regs->edgectrl1;
405
406 gpio &= 0x07;
407 l = readl_relaxed(reg);
408 l &= ~(3 << (gpio << 1));
409 if (trigger & IRQ_TYPE_EDGE_RISING)
410 l |= 2 << (gpio << 1);
411 if (trigger & IRQ_TYPE_EDGE_FALLING)
412 l |= BIT(gpio << 1);
413
414 /* Enable wake-up during idle for dynamic tick */
415 omap_gpio_rmw(base, bank->regs->wkup_en, BIT(gpio), trigger);
416 bank->context.wake_en =
417 readl_relaxed(bank->base + bank->regs->wkup_en);
418 writel_relaxed(l, reg);
419 }
420 return 0;
421}
422
423static void omap_enable_gpio_module(struct gpio_bank *bank, unsigned offset)
424{
425 if (bank->regs->pinctrl) {
426 void __iomem *reg = bank->base + bank->regs->pinctrl;
427
428 /* Claim the pin for MPU */
429 writel_relaxed(readl_relaxed(reg) | (BIT(offset)), reg);
430 }
431
432 if (bank->regs->ctrl && !BANK_USED(bank)) {
433 void __iomem *reg = bank->base + bank->regs->ctrl;
434 u32 ctrl;
435
436 ctrl = readl_relaxed(reg);
437 /* Module is enabled, clocks are not gated */
438 ctrl &= ~GPIO_MOD_CTRL_BIT;
439 writel_relaxed(ctrl, reg);
440 bank->context.ctrl = ctrl;
441 }
442}
443
444static void omap_disable_gpio_module(struct gpio_bank *bank, unsigned offset)
445{
446 void __iomem *base = bank->base;
447
448 if (bank->regs->wkup_en &&
449 !LINE_USED(bank->mod_usage, offset) &&
450 !LINE_USED(bank->irq_usage, offset)) {
451 /* Disable wake-up during idle for dynamic tick */
452 omap_gpio_rmw(base, bank->regs->wkup_en, BIT(offset), 0);
453 bank->context.wake_en =
454 readl_relaxed(bank->base + bank->regs->wkup_en);
455 }
456
457 if (bank->regs->ctrl && !BANK_USED(bank)) {
458 void __iomem *reg = bank->base + bank->regs->ctrl;
459 u32 ctrl;
460
461 ctrl = readl_relaxed(reg);
462 /* Module is disabled, clocks are gated */
463 ctrl |= GPIO_MOD_CTRL_BIT;
464 writel_relaxed(ctrl, reg);
465 bank->context.ctrl = ctrl;
466 }
467}
468
469static int omap_gpio_is_input(struct gpio_bank *bank, unsigned offset)
470{
471 void __iomem *reg = bank->base + bank->regs->direction;
472
473 return readl_relaxed(reg) & BIT(offset);
474}
475
476static void omap_gpio_init_irq(struct gpio_bank *bank, unsigned offset)
477{
478 if (!LINE_USED(bank->mod_usage, offset)) {
479 omap_enable_gpio_module(bank, offset);
480 omap_set_gpio_direction(bank, offset, 1);
481 }
482 bank->irq_usage |= BIT(offset);
483}
484
485static int omap_gpio_irq_type(struct irq_data *d, unsigned type)
486{
487 struct gpio_bank *bank = omap_irq_data_get_bank(d);
488 int retval;
489 unsigned long flags;
490 unsigned offset = d->hwirq;
491
492 if (type & ~IRQ_TYPE_SENSE_MASK)
493 return -EINVAL;
494
495 if (!bank->regs->leveldetect0 &&
496 (type & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH)))
497 return -EINVAL;
498
499 raw_spin_lock_irqsave(&bank->lock, flags);
500 retval = omap_set_gpio_triggering(bank, offset, type);
501 if (retval) {
502 raw_spin_unlock_irqrestore(&bank->lock, flags);
503 goto error;
504 }
505 omap_gpio_init_irq(bank, offset);
506 if (!omap_gpio_is_input(bank, offset)) {
507 raw_spin_unlock_irqrestore(&bank->lock, flags);
508 retval = -EINVAL;
509 goto error;
510 }
511 raw_spin_unlock_irqrestore(&bank->lock, flags);
512
513 if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
514 irq_set_handler_locked(d, handle_level_irq);
515 else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
516 irq_set_handler_locked(d, handle_edge_irq);
517
518 return 0;
519
520error:
521 return retval;
522}
523
524static void omap_clear_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
525{
526 void __iomem *reg = bank->base;
527
528 reg += bank->regs->irqstatus;
529 writel_relaxed(gpio_mask, reg);
530
531 /* Workaround for clearing DSP GPIO interrupts to allow retention */
532 if (bank->regs->irqstatus2) {
533 reg = bank->base + bank->regs->irqstatus2;
534 writel_relaxed(gpio_mask, reg);
535 }
536
537 /* Flush posted write for the irq status to avoid spurious interrupts */
538 readl_relaxed(reg);
539}
540
541static inline void omap_clear_gpio_irqstatus(struct gpio_bank *bank,
542 unsigned offset)
543{
544 omap_clear_gpio_irqbank(bank, BIT(offset));
545}
546
547static u32 omap_get_gpio_irqbank_mask(struct gpio_bank *bank)
548{
549 void __iomem *reg = bank->base;
550 u32 l;
551 u32 mask = (BIT(bank->width)) - 1;
552
553 reg += bank->regs->irqenable;
554 l = readl_relaxed(reg);
555 if (bank->regs->irqenable_inv)
556 l = ~l;
557 l &= mask;
558 return l;
559}
560
561static void omap_enable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
562{
563 void __iomem *reg = bank->base;
564 u32 l;
565
566 if (bank->regs->set_irqenable) {
567 reg += bank->regs->set_irqenable;
568 l = gpio_mask;
569 bank->context.irqenable1 |= gpio_mask;
570 } else {
571 reg += bank->regs->irqenable;
572 l = readl_relaxed(reg);
573 if (bank->regs->irqenable_inv)
574 l &= ~gpio_mask;
575 else
576 l |= gpio_mask;
577 bank->context.irqenable1 = l;
578 }
579
580 writel_relaxed(l, reg);
581}
582
583static void omap_disable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
584{
585 void __iomem *reg = bank->base;
586 u32 l;
587
588 if (bank->regs->clr_irqenable) {
589 reg += bank->regs->clr_irqenable;
590 l = gpio_mask;
591 bank->context.irqenable1 &= ~gpio_mask;
592 } else {
593 reg += bank->regs->irqenable;
594 l = readl_relaxed(reg);
595 if (bank->regs->irqenable_inv)
596 l |= gpio_mask;
597 else
598 l &= ~gpio_mask;
599 bank->context.irqenable1 = l;
600 }
601
602 writel_relaxed(l, reg);
603}
604
605static inline void omap_set_gpio_irqenable(struct gpio_bank *bank,
606 unsigned offset, int enable)
607{
608 if (enable)
609 omap_enable_gpio_irqbank(bank, BIT(offset));
610 else
611 omap_disable_gpio_irqbank(bank, BIT(offset));
612}
613
614/*
615 * Note that ENAWAKEUP needs to be enabled in GPIO_SYSCONFIG register.
616 * 1510 does not seem to have a wake-up register. If JTAG is connected
617 * to the target, system will wake up always on GPIO events. While
618 * system is running all registered GPIO interrupts need to have wake-up
619 * enabled. When system is suspended, only selected GPIO interrupts need
620 * to have wake-up enabled.
621 */
622static int omap_set_gpio_wakeup(struct gpio_bank *bank, unsigned offset,
623 int enable)
624{
625 u32 gpio_bit = BIT(offset);
626 unsigned long flags;
627
628 if (bank->non_wakeup_gpios & gpio_bit) {
629 dev_err(bank->chip.parent,
630 "Unable to modify wakeup on non-wakeup GPIO%d\n",
631 offset);
632 return -EINVAL;
633 }
634
635 raw_spin_lock_irqsave(&bank->lock, flags);
636 if (enable)
637 bank->context.wake_en |= gpio_bit;
638 else
639 bank->context.wake_en &= ~gpio_bit;
640
641 writel_relaxed(bank->context.wake_en, bank->base + bank->regs->wkup_en);
642 raw_spin_unlock_irqrestore(&bank->lock, flags);
643
644 return 0;
645}
646
647/* Use disable_irq_wake() and enable_irq_wake() functions from drivers */
648static int omap_gpio_wake_enable(struct irq_data *d, unsigned int enable)
649{
650 struct gpio_bank *bank = omap_irq_data_get_bank(d);
651 unsigned offset = d->hwirq;
652 int ret;
653
654 ret = omap_set_gpio_wakeup(bank, offset, enable);
655 if (!ret)
656 ret = irq_set_irq_wake(bank->irq, enable);
657
658 return ret;
659}
660
661static int omap_gpio_request(struct gpio_chip *chip, unsigned offset)
662{
663 struct gpio_bank *bank = gpiochip_get_data(chip);
664 unsigned long flags;
665
666 /*
667 * If this is the first gpio_request for the bank,
668 * enable the bank module.
669 */
670 if (!BANK_USED(bank))
671 pm_runtime_get_sync(chip->parent);
672
673 raw_spin_lock_irqsave(&bank->lock, flags);
674 omap_enable_gpio_module(bank, offset);
675 bank->mod_usage |= BIT(offset);
676 raw_spin_unlock_irqrestore(&bank->lock, flags);
677
678 return 0;
679}
680
681static void omap_gpio_free(struct gpio_chip *chip, unsigned offset)
682{
683 struct gpio_bank *bank = gpiochip_get_data(chip);
684 unsigned long flags;
685
686 raw_spin_lock_irqsave(&bank->lock, flags);
687 bank->mod_usage &= ~(BIT(offset));
688 if (!LINE_USED(bank->irq_usage, offset)) {
689 omap_set_gpio_direction(bank, offset, 1);
690 omap_clear_gpio_debounce(bank, offset);
691 }
692 omap_disable_gpio_module(bank, offset);
693 raw_spin_unlock_irqrestore(&bank->lock, flags);
694
695 /*
696 * If this is the last gpio to be freed in the bank,
697 * disable the bank module.
698 */
699 if (!BANK_USED(bank))
700 pm_runtime_put(chip->parent);
701}
702
703/*
704 * We need to unmask the GPIO bank interrupt as soon as possible to
705 * avoid missing GPIO interrupts for other lines in the bank.
706 * Then we need to mask-read-clear-unmask the triggered GPIO lines
707 * in the bank to avoid missing nested interrupts for a GPIO line.
708 * If we wait to unmask individual GPIO lines in the bank after the
709 * line's interrupt handler has been run, we may miss some nested
710 * interrupts.
711 */
712static irqreturn_t omap_gpio_irq_handler(int irq, void *gpiobank)
713{
714 void __iomem *isr_reg = NULL;
715 u32 isr;
716 unsigned int bit;
717 struct gpio_bank *bank = gpiobank;
718 unsigned long wa_lock_flags;
719 unsigned long lock_flags;
720
721 isr_reg = bank->base + bank->regs->irqstatus;
722 if (WARN_ON(!isr_reg))
723 goto exit;
724
725 pm_runtime_get_sync(bank->chip.parent);
726
727 while (1) {
728 u32 isr_saved, level_mask = 0;
729 u32 enabled;
730
731 raw_spin_lock_irqsave(&bank->lock, lock_flags);
732
733 enabled = omap_get_gpio_irqbank_mask(bank);
734 isr_saved = isr = readl_relaxed(isr_reg) & enabled;
735
736 if (bank->level_mask)
737 level_mask = bank->level_mask & enabled;
738
739 /* clear edge sensitive interrupts before handler(s) are
740 called so that we don't miss any interrupt occurred while
741 executing them */
742 omap_disable_gpio_irqbank(bank, isr_saved & ~level_mask);
743 omap_clear_gpio_irqbank(bank, isr_saved & ~level_mask);
744 omap_enable_gpio_irqbank(bank, isr_saved & ~level_mask);
745
746 raw_spin_unlock_irqrestore(&bank->lock, lock_flags);
747
748 if (!isr)
749 break;
750
751 while (isr) {
752 bit = __ffs(isr);
753 isr &= ~(BIT(bit));
754
755 raw_spin_lock_irqsave(&bank->lock, lock_flags);
756 /*
757 * Some chips can't respond to both rising and falling
758 * at the same time. If this irq was requested with
759 * both flags, we need to flip the ICR data for the IRQ
760 * to respond to the IRQ for the opposite direction.
761 * This will be indicated in the bank toggle_mask.
762 */
763 if (bank->toggle_mask & (BIT(bit)))
764 omap_toggle_gpio_edge_triggering(bank, bit);
765
766 raw_spin_unlock_irqrestore(&bank->lock, lock_flags);
767
768 raw_spin_lock_irqsave(&bank->wa_lock, wa_lock_flags);
769
770 generic_handle_irq(irq_find_mapping(bank->chip.irqdomain,
771 bit));
772
773 raw_spin_unlock_irqrestore(&bank->wa_lock,
774 wa_lock_flags);
775 }
776 }
777exit:
778 pm_runtime_put(bank->chip.parent);
779 return IRQ_HANDLED;
780}
781
782static unsigned int omap_gpio_irq_startup(struct irq_data *d)
783{
784 struct gpio_bank *bank = omap_irq_data_get_bank(d);
785 unsigned long flags;
786 unsigned offset = d->hwirq;
787
788 raw_spin_lock_irqsave(&bank->lock, flags);
789
790 if (!LINE_USED(bank->mod_usage, offset))
791 omap_set_gpio_direction(bank, offset, 1);
792 else if (!omap_gpio_is_input(bank, offset))
793 goto err;
794 omap_enable_gpio_module(bank, offset);
795 bank->irq_usage |= BIT(offset);
796
797 raw_spin_unlock_irqrestore(&bank->lock, flags);
798 omap_gpio_unmask_irq(d);
799
800 return 0;
801err:
802 raw_spin_unlock_irqrestore(&bank->lock, flags);
803 return -EINVAL;
804}
805
806static void omap_gpio_irq_shutdown(struct irq_data *d)
807{
808 struct gpio_bank *bank = omap_irq_data_get_bank(d);
809 unsigned long flags;
810 unsigned offset = d->hwirq;
811
812 raw_spin_lock_irqsave(&bank->lock, flags);
813 bank->irq_usage &= ~(BIT(offset));
814 omap_set_gpio_irqenable(bank, offset, 0);
815 omap_clear_gpio_irqstatus(bank, offset);
816 omap_set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);
817 if (!LINE_USED(bank->mod_usage, offset))
818 omap_clear_gpio_debounce(bank, offset);
819 omap_disable_gpio_module(bank, offset);
820 raw_spin_unlock_irqrestore(&bank->lock, flags);
821}
822
823static void omap_gpio_irq_bus_lock(struct irq_data *data)
824{
825 struct gpio_bank *bank = omap_irq_data_get_bank(data);
826
827 if (!BANK_USED(bank))
828 pm_runtime_get_sync(bank->chip.parent);
829}
830
831static void gpio_irq_bus_sync_unlock(struct irq_data *data)
832{
833 struct gpio_bank *bank = omap_irq_data_get_bank(data);
834
835 /*
836 * If this is the last IRQ to be freed in the bank,
837 * disable the bank module.
838 */
839 if (!BANK_USED(bank))
840 pm_runtime_put(bank->chip.parent);
841}
842
843static void omap_gpio_ack_irq(struct irq_data *d)
844{
845 struct gpio_bank *bank = omap_irq_data_get_bank(d);
846 unsigned offset = d->hwirq;
847
848 omap_clear_gpio_irqstatus(bank, offset);
849}
850
851static void omap_gpio_mask_irq(struct irq_data *d)
852{
853 struct gpio_bank *bank = omap_irq_data_get_bank(d);
854 unsigned offset = d->hwirq;
855 unsigned long flags;
856
857 raw_spin_lock_irqsave(&bank->lock, flags);
858 omap_set_gpio_irqenable(bank, offset, 0);
859 omap_set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);
860 raw_spin_unlock_irqrestore(&bank->lock, flags);
861}
862
863static void omap_gpio_unmask_irq(struct irq_data *d)
864{
865 struct gpio_bank *bank = omap_irq_data_get_bank(d);
866 unsigned offset = d->hwirq;
867 u32 trigger = irqd_get_trigger_type(d);
868 unsigned long flags;
869
870 raw_spin_lock_irqsave(&bank->lock, flags);
871 if (trigger)
872 omap_set_gpio_triggering(bank, offset, trigger);
873
874 /* For level-triggered GPIOs, the clearing must be done after
875 * the HW source is cleared, thus after the handler has run */
876 if (bank->level_mask & BIT(offset)) {
877 omap_set_gpio_irqenable(bank, offset, 0);
878 omap_clear_gpio_irqstatus(bank, offset);
879 }
880
881 omap_set_gpio_irqenable(bank, offset, 1);
882 raw_spin_unlock_irqrestore(&bank->lock, flags);
883}
884
885/*---------------------------------------------------------------------*/
886
887static int omap_mpuio_suspend_noirq(struct device *dev)
888{
889 struct platform_device *pdev = to_platform_device(dev);
890 struct gpio_bank *bank = platform_get_drvdata(pdev);
891 void __iomem *mask_reg = bank->base +
892 OMAP_MPUIO_GPIO_MASKIT / bank->stride;
893 unsigned long flags;
894
895 raw_spin_lock_irqsave(&bank->lock, flags);
896 writel_relaxed(0xffff & ~bank->context.wake_en, mask_reg);
897 raw_spin_unlock_irqrestore(&bank->lock, flags);
898
899 return 0;
900}
901
902static int omap_mpuio_resume_noirq(struct device *dev)
903{
904 struct platform_device *pdev = to_platform_device(dev);
905 struct gpio_bank *bank = platform_get_drvdata(pdev);
906 void __iomem *mask_reg = bank->base +
907 OMAP_MPUIO_GPIO_MASKIT / bank->stride;
908 unsigned long flags;
909
910 raw_spin_lock_irqsave(&bank->lock, flags);
911 writel_relaxed(bank->context.wake_en, mask_reg);
912 raw_spin_unlock_irqrestore(&bank->lock, flags);
913
914 return 0;
915}
916
917static const struct dev_pm_ops omap_mpuio_dev_pm_ops = {
918 .suspend_noirq = omap_mpuio_suspend_noirq,
919 .resume_noirq = omap_mpuio_resume_noirq,
920};
921
922/* use platform_driver for this. */
923static struct platform_driver omap_mpuio_driver = {
924 .driver = {
925 .name = "mpuio",
926 .pm = &omap_mpuio_dev_pm_ops,
927 },
928};
929
930static struct platform_device omap_mpuio_device = {
931 .name = "mpuio",
932 .id = -1,
933 .dev = {
934 .driver = &omap_mpuio_driver.driver,
935 }
936 /* could list the /proc/iomem resources */
937};
938
939static inline void omap_mpuio_init(struct gpio_bank *bank)
940{
941 platform_set_drvdata(&omap_mpuio_device, bank);
942
943 if (platform_driver_register(&omap_mpuio_driver) == 0)
944 (void) platform_device_register(&omap_mpuio_device);
945}
946
947/*---------------------------------------------------------------------*/
948
949static int omap_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
950{
951 struct gpio_bank *bank;
952 unsigned long flags;
953 void __iomem *reg;
954 int dir;
955
956 bank = gpiochip_get_data(chip);
957 reg = bank->base + bank->regs->direction;
958 raw_spin_lock_irqsave(&bank->lock, flags);
959 dir = !!(readl_relaxed(reg) & BIT(offset));
960 raw_spin_unlock_irqrestore(&bank->lock, flags);
961 return dir;
962}
963
964static int omap_gpio_input(struct gpio_chip *chip, unsigned offset)
965{
966 struct gpio_bank *bank;
967 unsigned long flags;
968
969 bank = gpiochip_get_data(chip);
970 raw_spin_lock_irqsave(&bank->lock, flags);
971 omap_set_gpio_direction(bank, offset, 1);
972 raw_spin_unlock_irqrestore(&bank->lock, flags);
973 return 0;
974}
975
976static int omap_gpio_get(struct gpio_chip *chip, unsigned offset)
977{
978 struct gpio_bank *bank;
979
980 bank = gpiochip_get_data(chip);
981
982 if (omap_gpio_is_input(bank, offset))
983 return omap_get_gpio_datain(bank, offset);
984 else
985 return omap_get_gpio_dataout(bank, offset);
986}
987
988static int omap_gpio_output(struct gpio_chip *chip, unsigned offset, int value)
989{
990 struct gpio_bank *bank;
991 unsigned long flags;
992
993 bank = gpiochip_get_data(chip);
994 raw_spin_lock_irqsave(&bank->lock, flags);
995 bank->set_dataout(bank, offset, value);
996 omap_set_gpio_direction(bank, offset, 0);
997 raw_spin_unlock_irqrestore(&bank->lock, flags);
998 return 0;
999}
1000
1001static int omap_gpio_debounce(struct gpio_chip *chip, unsigned offset,
1002 unsigned debounce)
1003{
1004 struct gpio_bank *bank;
1005 unsigned long flags;
1006
1007 bank = gpiochip_get_data(chip);
1008
1009 raw_spin_lock_irqsave(&bank->lock, flags);
1010 omap2_set_gpio_debounce(bank, offset, debounce);
1011 raw_spin_unlock_irqrestore(&bank->lock, flags);
1012
1013 return 0;
1014}
1015
1016static void omap_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
1017{
1018 struct gpio_bank *bank;
1019 unsigned long flags;
1020
1021 bank = gpiochip_get_data(chip);
1022 raw_spin_lock_irqsave(&bank->lock, flags);
1023 bank->set_dataout(bank, offset, value);
1024 raw_spin_unlock_irqrestore(&bank->lock, flags);
1025}
1026
1027/*---------------------------------------------------------------------*/
1028
1029static void __init omap_gpio_show_rev(struct gpio_bank *bank)
1030{
1031 static bool called;
1032 u32 rev;
1033
1034 if (called || bank->regs->revision == USHRT_MAX)
1035 return;
1036
1037 rev = readw_relaxed(bank->base + bank->regs->revision);
1038 pr_info("OMAP GPIO hardware version %d.%d\n",
1039 (rev >> 4) & 0x0f, rev & 0x0f);
1040
1041 called = true;
1042}
1043
1044static void omap_gpio_mod_init(struct gpio_bank *bank)
1045{
1046 void __iomem *base = bank->base;
1047 u32 l = 0xffffffff;
1048
1049 if (bank->width == 16)
1050 l = 0xffff;
1051
1052 if (bank->is_mpuio) {
1053 writel_relaxed(l, bank->base + bank->regs->irqenable);
1054 return;
1055 }
1056
1057 omap_gpio_rmw(base, bank->regs->irqenable, l,
1058 bank->regs->irqenable_inv);
1059 omap_gpio_rmw(base, bank->regs->irqstatus, l,
1060 !bank->regs->irqenable_inv);
1061 if (bank->regs->debounce_en)
1062 writel_relaxed(0, base + bank->regs->debounce_en);
1063
1064 /* Save OE default value (0xffffffff) in the context */
1065 bank->context.oe = readl_relaxed(bank->base + bank->regs->direction);
1066 /* Initialize interface clk ungated, module enabled */
1067 if (bank->regs->ctrl)
1068 writel_relaxed(0, base + bank->regs->ctrl);
1069}
1070
1071static int omap_gpio_chip_init(struct gpio_bank *bank, struct irq_chip *irqc)
1072{
1073 static int gpio;
1074 int irq_base = 0;
1075 int ret;
1076
1077 /*
1078 * REVISIT eventually switch from OMAP-specific gpio structs
1079 * over to the generic ones
1080 */
1081 bank->chip.request = omap_gpio_request;
1082 bank->chip.free = omap_gpio_free;
1083 bank->chip.get_direction = omap_gpio_get_direction;
1084 bank->chip.direction_input = omap_gpio_input;
1085 bank->chip.get = omap_gpio_get;
1086 bank->chip.direction_output = omap_gpio_output;
1087 bank->chip.set_debounce = omap_gpio_debounce;
1088 bank->chip.set = omap_gpio_set;
1089 if (bank->is_mpuio) {
1090 bank->chip.label = "mpuio";
1091 if (bank->regs->wkup_en)
1092 bank->chip.parent = &omap_mpuio_device.dev;
1093 bank->chip.base = OMAP_MPUIO(0);
1094 } else {
1095 bank->chip.label = "gpio";
1096 bank->chip.base = gpio;
1097 }
1098 bank->chip.ngpio = bank->width;
1099
1100 ret = gpiochip_add_data(&bank->chip, bank);
1101 if (ret) {
1102 dev_err(bank->chip.parent,
1103 "Could not register gpio chip %d\n", ret);
1104 return ret;
1105 }
1106
1107 if (!bank->is_mpuio)
1108 gpio += bank->width;
1109
1110#ifdef CONFIG_ARCH_OMAP1
1111 /*
1112 * REVISIT: Once we have OMAP1 supporting SPARSE_IRQ, we can drop
1113 * irq_alloc_descs() since a base IRQ offset will no longer be needed.
1114 */
1115 irq_base = irq_alloc_descs(-1, 0, bank->width, 0);
1116 if (irq_base < 0) {
1117 dev_err(bank->chip.parent, "Couldn't allocate IRQ numbers\n");
1118 return -ENODEV;
1119 }
1120#endif
1121
1122 /* MPUIO is a bit different, reading IRQ status clears it */
1123 if (bank->is_mpuio) {
1124 irqc->irq_ack = dummy_irq_chip.irq_ack;
1125 if (!bank->regs->wkup_en)
1126 irqc->irq_set_wake = NULL;
1127 }
1128
1129 ret = gpiochip_irqchip_add(&bank->chip, irqc,
1130 irq_base, handle_bad_irq,
1131 IRQ_TYPE_NONE);
1132
1133 if (ret) {
1134 dev_err(bank->chip.parent,
1135 "Couldn't add irqchip to gpiochip %d\n", ret);
1136 gpiochip_remove(&bank->chip);
1137 return -ENODEV;
1138 }
1139
1140 gpiochip_set_chained_irqchip(&bank->chip, irqc, bank->irq, NULL);
1141
1142 ret = devm_request_irq(bank->chip.parent, bank->irq,
1143 omap_gpio_irq_handler,
1144 0, dev_name(bank->chip.parent), bank);
1145 if (ret)
1146 gpiochip_remove(&bank->chip);
1147
1148 return ret;
1149}
1150
1151static const struct of_device_id omap_gpio_match[];
1152
1153static int omap_gpio_probe(struct platform_device *pdev)
1154{
1155 struct device *dev = &pdev->dev;
1156 struct device_node *node = dev->of_node;
1157 const struct of_device_id *match;
1158 const struct omap_gpio_platform_data *pdata;
1159 struct resource *res;
1160 struct gpio_bank *bank;
1161 struct irq_chip *irqc;
1162 int ret;
1163
1164 match = of_match_device(of_match_ptr(omap_gpio_match), dev);
1165
1166 pdata = match ? match->data : dev_get_platdata(dev);
1167 if (!pdata)
1168 return -EINVAL;
1169
1170 bank = devm_kzalloc(dev, sizeof(struct gpio_bank), GFP_KERNEL);
1171 if (!bank) {
1172 dev_err(dev, "Memory alloc failed\n");
1173 return -ENOMEM;
1174 }
1175
1176 irqc = devm_kzalloc(dev, sizeof(*irqc), GFP_KERNEL);
1177 if (!irqc)
1178 return -ENOMEM;
1179
1180 irqc->irq_startup = omap_gpio_irq_startup,
1181 irqc->irq_shutdown = omap_gpio_irq_shutdown,
1182 irqc->irq_ack = omap_gpio_ack_irq,
1183 irqc->irq_mask = omap_gpio_mask_irq,
1184 irqc->irq_unmask = omap_gpio_unmask_irq,
1185 irqc->irq_set_type = omap_gpio_irq_type,
1186 irqc->irq_set_wake = omap_gpio_wake_enable,
1187 irqc->irq_bus_lock = omap_gpio_irq_bus_lock,
1188 irqc->irq_bus_sync_unlock = gpio_irq_bus_sync_unlock,
1189 irqc->name = dev_name(&pdev->dev);
1190
1191 bank->irq = platform_get_irq(pdev, 0);
1192 if (bank->irq <= 0) {
1193 if (!bank->irq)
1194 bank->irq = -ENXIO;
1195 if (bank->irq != -EPROBE_DEFER)
1196 dev_err(dev,
1197 "can't get irq resource ret=%d\n", bank->irq);
1198 return bank->irq;
1199 }
1200
1201 bank->chip.parent = dev;
1202 bank->chip.owner = THIS_MODULE;
1203 bank->dbck_flag = pdata->dbck_flag;
1204 bank->stride = pdata->bank_stride;
1205 bank->width = pdata->bank_width;
1206 bank->is_mpuio = pdata->is_mpuio;
1207 bank->non_wakeup_gpios = pdata->non_wakeup_gpios;
1208 bank->regs = pdata->regs;
1209#ifdef CONFIG_OF_GPIO
1210 bank->chip.of_node = of_node_get(node);
1211#endif
1212 if (node) {
1213 if (!of_property_read_bool(node, "ti,gpio-always-on"))
1214 bank->loses_context = true;
1215 } else {
1216 bank->loses_context = pdata->loses_context;
1217
1218 if (bank->loses_context)
1219 bank->get_context_loss_count =
1220 pdata->get_context_loss_count;
1221 }
1222
1223 if (bank->regs->set_dataout && bank->regs->clr_dataout)
1224 bank->set_dataout = omap_set_gpio_dataout_reg;
1225 else
1226 bank->set_dataout = omap_set_gpio_dataout_mask;
1227
1228 raw_spin_lock_init(&bank->lock);
1229 raw_spin_lock_init(&bank->wa_lock);
1230
1231 /* Static mapping, never released */
1232 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1233 bank->base = devm_ioremap_resource(dev, res);
1234 if (IS_ERR(bank->base)) {
1235 return PTR_ERR(bank->base);
1236 }
1237
1238 if (bank->dbck_flag) {
1239 bank->dbck = devm_clk_get(dev, "dbclk");
1240 if (IS_ERR(bank->dbck)) {
1241 dev_err(dev,
1242 "Could not get gpio dbck. Disable debounce\n");
1243 bank->dbck_flag = false;
1244 } else {
1245 clk_prepare(bank->dbck);
1246 }
1247 }
1248
1249 platform_set_drvdata(pdev, bank);
1250
1251 pm_runtime_enable(dev);
1252 pm_runtime_irq_safe(dev);
1253 pm_runtime_get_sync(dev);
1254
1255 if (bank->is_mpuio)
1256 omap_mpuio_init(bank);
1257
1258 omap_gpio_mod_init(bank);
1259
1260 ret = omap_gpio_chip_init(bank, irqc);
1261 if (ret) {
1262 pm_runtime_put_sync(dev);
1263 pm_runtime_disable(dev);
1264 return ret;
1265 }
1266
1267 omap_gpio_show_rev(bank);
1268
1269 pm_runtime_put(dev);
1270
1271 list_add_tail(&bank->node, &omap_gpio_list);
1272
1273 return 0;
1274}
1275
1276static int omap_gpio_remove(struct platform_device *pdev)
1277{
1278 struct gpio_bank *bank = platform_get_drvdata(pdev);
1279
1280 list_del(&bank->node);
1281 gpiochip_remove(&bank->chip);
1282 pm_runtime_disable(&pdev->dev);
1283 if (bank->dbck_flag)
1284 clk_unprepare(bank->dbck);
1285
1286 return 0;
1287}
1288
1289#ifdef CONFIG_ARCH_OMAP2PLUS
1290
1291#if defined(CONFIG_PM)
1292static void omap_gpio_restore_context(struct gpio_bank *bank);
1293
1294static int omap_gpio_runtime_suspend(struct device *dev)
1295{
1296 struct platform_device *pdev = to_platform_device(dev);
1297 struct gpio_bank *bank = platform_get_drvdata(pdev);
1298 u32 l1 = 0, l2 = 0;
1299 unsigned long flags;
1300 u32 wake_low, wake_hi;
1301
1302 raw_spin_lock_irqsave(&bank->lock, flags);
1303
1304 /*
1305 * Only edges can generate a wakeup event to the PRCM.
1306 *
1307 * Therefore, ensure any wake-up capable GPIOs have
1308 * edge-detection enabled before going idle to ensure a wakeup
1309 * to the PRCM is generated on a GPIO transition. (c.f. 34xx
1310 * NDA TRM 25.5.3.1)
1311 *
1312 * The normal values will be restored upon ->runtime_resume()
1313 * by writing back the values saved in bank->context.
1314 */
1315 wake_low = bank->context.leveldetect0 & bank->context.wake_en;
1316 if (wake_low)
1317 writel_relaxed(wake_low | bank->context.fallingdetect,
1318 bank->base + bank->regs->fallingdetect);
1319 wake_hi = bank->context.leveldetect1 & bank->context.wake_en;
1320 if (wake_hi)
1321 writel_relaxed(wake_hi | bank->context.risingdetect,
1322 bank->base + bank->regs->risingdetect);
1323
1324 if (!bank->enabled_non_wakeup_gpios)
1325 goto update_gpio_context_count;
1326
1327 if (bank->power_mode != OFF_MODE) {
1328 bank->power_mode = 0;
1329 goto update_gpio_context_count;
1330 }
1331 /*
1332 * If going to OFF, remove triggering for all
1333 * non-wakeup GPIOs. Otherwise spurious IRQs will be
1334 * generated. See OMAP2420 Errata item 1.101.
1335 */
1336 bank->saved_datain = readl_relaxed(bank->base +
1337 bank->regs->datain);
1338 l1 = bank->context.fallingdetect;
1339 l2 = bank->context.risingdetect;
1340
1341 l1 &= ~bank->enabled_non_wakeup_gpios;
1342 l2 &= ~bank->enabled_non_wakeup_gpios;
1343
1344 writel_relaxed(l1, bank->base + bank->regs->fallingdetect);
1345 writel_relaxed(l2, bank->base + bank->regs->risingdetect);
1346
1347 bank->workaround_enabled = true;
1348
1349update_gpio_context_count:
1350 if (bank->get_context_loss_count)
1351 bank->context_loss_count =
1352 bank->get_context_loss_count(dev);
1353
1354 omap_gpio_dbck_disable(bank);
1355 raw_spin_unlock_irqrestore(&bank->lock, flags);
1356
1357 return 0;
1358}
1359
1360static void omap_gpio_init_context(struct gpio_bank *p);
1361
1362static int omap_gpio_runtime_resume(struct device *dev)
1363{
1364 struct platform_device *pdev = to_platform_device(dev);
1365 struct gpio_bank *bank = platform_get_drvdata(pdev);
1366 u32 l = 0, gen, gen0, gen1;
1367 unsigned long flags;
1368 int c;
1369
1370 raw_spin_lock_irqsave(&bank->lock, flags);
1371
1372 /*
1373 * On the first resume during the probe, the context has not
1374 * been initialised and so initialise it now. Also initialise
1375 * the context loss count.
1376 */
1377 if (bank->loses_context && !bank->context_valid) {
1378 omap_gpio_init_context(bank);
1379
1380 if (bank->get_context_loss_count)
1381 bank->context_loss_count =
1382 bank->get_context_loss_count(dev);
1383 }
1384
1385 omap_gpio_dbck_enable(bank);
1386
1387 /*
1388 * In ->runtime_suspend(), level-triggered, wakeup-enabled
1389 * GPIOs were set to edge trigger also in order to be able to
1390 * generate a PRCM wakeup. Here we restore the
1391 * pre-runtime_suspend() values for edge triggering.
1392 */
1393 writel_relaxed(bank->context.fallingdetect,
1394 bank->base + bank->regs->fallingdetect);
1395 writel_relaxed(bank->context.risingdetect,
1396 bank->base + bank->regs->risingdetect);
1397
1398 if (bank->loses_context) {
1399 if (!bank->get_context_loss_count) {
1400 omap_gpio_restore_context(bank);
1401 } else {
1402 c = bank->get_context_loss_count(dev);
1403 if (c != bank->context_loss_count) {
1404 omap_gpio_restore_context(bank);
1405 } else {
1406 raw_spin_unlock_irqrestore(&bank->lock, flags);
1407 return 0;
1408 }
1409 }
1410 }
1411
1412 if (!bank->workaround_enabled) {
1413 raw_spin_unlock_irqrestore(&bank->lock, flags);
1414 return 0;
1415 }
1416
1417 l = readl_relaxed(bank->base + bank->regs->datain);
1418
1419 /*
1420 * Check if any of the non-wakeup interrupt GPIOs have changed
1421 * state. If so, generate an IRQ by software. This is
1422 * horribly racy, but it's the best we can do to work around
1423 * this silicon bug.
1424 */
1425 l ^= bank->saved_datain;
1426 l &= bank->enabled_non_wakeup_gpios;
1427
1428 /*
1429 * No need to generate IRQs for the rising edge for gpio IRQs
1430 * configured with falling edge only; and vice versa.
1431 */
1432 gen0 = l & bank->context.fallingdetect;
1433 gen0 &= bank->saved_datain;
1434
1435 gen1 = l & bank->context.risingdetect;
1436 gen1 &= ~(bank->saved_datain);
1437
1438 /* FIXME: Consider GPIO IRQs with level detections properly! */
1439 gen = l & (~(bank->context.fallingdetect) &
1440 ~(bank->context.risingdetect));
1441 /* Consider all GPIO IRQs needed to be updated */
1442 gen |= gen0 | gen1;
1443
1444 if (gen) {
1445 u32 old0, old1;
1446
1447 old0 = readl_relaxed(bank->base + bank->regs->leveldetect0);
1448 old1 = readl_relaxed(bank->base + bank->regs->leveldetect1);
1449
1450 if (!bank->regs->irqstatus_raw0) {
1451 writel_relaxed(old0 | gen, bank->base +
1452 bank->regs->leveldetect0);
1453 writel_relaxed(old1 | gen, bank->base +
1454 bank->regs->leveldetect1);
1455 }
1456
1457 if (bank->regs->irqstatus_raw0) {
1458 writel_relaxed(old0 | l, bank->base +
1459 bank->regs->leveldetect0);
1460 writel_relaxed(old1 | l, bank->base +
1461 bank->regs->leveldetect1);
1462 }
1463 writel_relaxed(old0, bank->base + bank->regs->leveldetect0);
1464 writel_relaxed(old1, bank->base + bank->regs->leveldetect1);
1465 }
1466
1467 bank->workaround_enabled = false;
1468 raw_spin_unlock_irqrestore(&bank->lock, flags);
1469
1470 return 0;
1471}
1472#endif /* CONFIG_PM */
1473
1474#if IS_BUILTIN(CONFIG_GPIO_OMAP)
1475void omap2_gpio_prepare_for_idle(int pwr_mode)
1476{
1477 struct gpio_bank *bank;
1478
1479 list_for_each_entry(bank, &omap_gpio_list, node) {
1480 if (!BANK_USED(bank) || !bank->loses_context)
1481 continue;
1482
1483 bank->power_mode = pwr_mode;
1484
1485 pm_runtime_put_sync_suspend(bank->chip.parent);
1486 }
1487}
1488
1489void omap2_gpio_resume_after_idle(void)
1490{
1491 struct gpio_bank *bank;
1492
1493 list_for_each_entry(bank, &omap_gpio_list, node) {
1494 if (!BANK_USED(bank) || !bank->loses_context)
1495 continue;
1496
1497 pm_runtime_get_sync(bank->chip.parent);
1498 }
1499}
1500#endif
1501
1502#if defined(CONFIG_PM)
1503static void omap_gpio_init_context(struct gpio_bank *p)
1504{
1505 struct omap_gpio_reg_offs *regs = p->regs;
1506 void __iomem *base = p->base;
1507
1508 p->context.ctrl = readl_relaxed(base + regs->ctrl);
1509 p->context.oe = readl_relaxed(base + regs->direction);
1510 p->context.wake_en = readl_relaxed(base + regs->wkup_en);
1511 p->context.leveldetect0 = readl_relaxed(base + regs->leveldetect0);
1512 p->context.leveldetect1 = readl_relaxed(base + regs->leveldetect1);
1513 p->context.risingdetect = readl_relaxed(base + regs->risingdetect);
1514 p->context.fallingdetect = readl_relaxed(base + regs->fallingdetect);
1515 p->context.irqenable1 = readl_relaxed(base + regs->irqenable);
1516 p->context.irqenable2 = readl_relaxed(base + regs->irqenable2);
1517
1518 if (regs->set_dataout && p->regs->clr_dataout)
1519 p->context.dataout = readl_relaxed(base + regs->set_dataout);
1520 else
1521 p->context.dataout = readl_relaxed(base + regs->dataout);
1522
1523 p->context_valid = true;
1524}
1525
1526static void omap_gpio_restore_context(struct gpio_bank *bank)
1527{
1528 writel_relaxed(bank->context.wake_en,
1529 bank->base + bank->regs->wkup_en);
1530 writel_relaxed(bank->context.ctrl, bank->base + bank->regs->ctrl);
1531 writel_relaxed(bank->context.leveldetect0,
1532 bank->base + bank->regs->leveldetect0);
1533 writel_relaxed(bank->context.leveldetect1,
1534 bank->base + bank->regs->leveldetect1);
1535 writel_relaxed(bank->context.risingdetect,
1536 bank->base + bank->regs->risingdetect);
1537 writel_relaxed(bank->context.fallingdetect,
1538 bank->base + bank->regs->fallingdetect);
1539 if (bank->regs->set_dataout && bank->regs->clr_dataout)
1540 writel_relaxed(bank->context.dataout,
1541 bank->base + bank->regs->set_dataout);
1542 else
1543 writel_relaxed(bank->context.dataout,
1544 bank->base + bank->regs->dataout);
1545 writel_relaxed(bank->context.oe, bank->base + bank->regs->direction);
1546
1547 if (bank->dbck_enable_mask) {
1548 writel_relaxed(bank->context.debounce, bank->base +
1549 bank->regs->debounce);
1550 writel_relaxed(bank->context.debounce_en,
1551 bank->base + bank->regs->debounce_en);
1552 }
1553
1554 writel_relaxed(bank->context.irqenable1,
1555 bank->base + bank->regs->irqenable);
1556 writel_relaxed(bank->context.irqenable2,
1557 bank->base + bank->regs->irqenable2);
1558}
1559#endif /* CONFIG_PM */
1560#else
1561#define omap_gpio_runtime_suspend NULL
1562#define omap_gpio_runtime_resume NULL
1563static inline void omap_gpio_init_context(struct gpio_bank *p) {}
1564#endif
1565
1566static const struct dev_pm_ops gpio_pm_ops = {
1567 SET_RUNTIME_PM_OPS(omap_gpio_runtime_suspend, omap_gpio_runtime_resume,
1568 NULL)
1569};
1570
1571#if defined(CONFIG_OF)
1572static struct omap_gpio_reg_offs omap2_gpio_regs = {
1573 .revision = OMAP24XX_GPIO_REVISION,
1574 .direction = OMAP24XX_GPIO_OE,
1575 .datain = OMAP24XX_GPIO_DATAIN,
1576 .dataout = OMAP24XX_GPIO_DATAOUT,
1577 .set_dataout = OMAP24XX_GPIO_SETDATAOUT,
1578 .clr_dataout = OMAP24XX_GPIO_CLEARDATAOUT,
1579 .irqstatus = OMAP24XX_GPIO_IRQSTATUS1,
1580 .irqstatus2 = OMAP24XX_GPIO_IRQSTATUS2,
1581 .irqenable = OMAP24XX_GPIO_IRQENABLE1,
1582 .irqenable2 = OMAP24XX_GPIO_IRQENABLE2,
1583 .set_irqenable = OMAP24XX_GPIO_SETIRQENABLE1,
1584 .clr_irqenable = OMAP24XX_GPIO_CLEARIRQENABLE1,
1585 .debounce = OMAP24XX_GPIO_DEBOUNCE_VAL,
1586 .debounce_en = OMAP24XX_GPIO_DEBOUNCE_EN,
1587 .ctrl = OMAP24XX_GPIO_CTRL,
1588 .wkup_en = OMAP24XX_GPIO_WAKE_EN,
1589 .leveldetect0 = OMAP24XX_GPIO_LEVELDETECT0,
1590 .leveldetect1 = OMAP24XX_GPIO_LEVELDETECT1,
1591 .risingdetect = OMAP24XX_GPIO_RISINGDETECT,
1592 .fallingdetect = OMAP24XX_GPIO_FALLINGDETECT,
1593};
1594
1595static struct omap_gpio_reg_offs omap4_gpio_regs = {
1596 .revision = OMAP4_GPIO_REVISION,
1597 .direction = OMAP4_GPIO_OE,
1598 .datain = OMAP4_GPIO_DATAIN,
1599 .dataout = OMAP4_GPIO_DATAOUT,
1600 .set_dataout = OMAP4_GPIO_SETDATAOUT,
1601 .clr_dataout = OMAP4_GPIO_CLEARDATAOUT,
1602 .irqstatus = OMAP4_GPIO_IRQSTATUS0,
1603 .irqstatus2 = OMAP4_GPIO_IRQSTATUS1,
1604 .irqenable = OMAP4_GPIO_IRQSTATUSSET0,
1605 .irqenable2 = OMAP4_GPIO_IRQSTATUSSET1,
1606 .set_irqenable = OMAP4_GPIO_IRQSTATUSSET0,
1607 .clr_irqenable = OMAP4_GPIO_IRQSTATUSCLR0,
1608 .debounce = OMAP4_GPIO_DEBOUNCINGTIME,
1609 .debounce_en = OMAP4_GPIO_DEBOUNCENABLE,
1610 .ctrl = OMAP4_GPIO_CTRL,
1611 .wkup_en = OMAP4_GPIO_IRQWAKEN0,
1612 .leveldetect0 = OMAP4_GPIO_LEVELDETECT0,
1613 .leveldetect1 = OMAP4_GPIO_LEVELDETECT1,
1614 .risingdetect = OMAP4_GPIO_RISINGDETECT,
1615 .fallingdetect = OMAP4_GPIO_FALLINGDETECT,
1616};
1617
1618static const struct omap_gpio_platform_data omap2_pdata = {
1619 .regs = &omap2_gpio_regs,
1620 .bank_width = 32,
1621 .dbck_flag = false,
1622};
1623
1624static const struct omap_gpio_platform_data omap3_pdata = {
1625 .regs = &omap2_gpio_regs,
1626 .bank_width = 32,
1627 .dbck_flag = true,
1628};
1629
1630static const struct omap_gpio_platform_data omap4_pdata = {
1631 .regs = &omap4_gpio_regs,
1632 .bank_width = 32,
1633 .dbck_flag = true,
1634};
1635
1636static const struct of_device_id omap_gpio_match[] = {
1637 {
1638 .compatible = "ti,omap4-gpio",
1639 .data = &omap4_pdata,
1640 },
1641 {
1642 .compatible = "ti,omap3-gpio",
1643 .data = &omap3_pdata,
1644 },
1645 {
1646 .compatible = "ti,omap2-gpio",
1647 .data = &omap2_pdata,
1648 },
1649 { },
1650};
1651MODULE_DEVICE_TABLE(of, omap_gpio_match);
1652#endif
1653
1654static struct platform_driver omap_gpio_driver = {
1655 .probe = omap_gpio_probe,
1656 .remove = omap_gpio_remove,
1657 .driver = {
1658 .name = "omap_gpio",
1659 .pm = &gpio_pm_ops,
1660 .of_match_table = of_match_ptr(omap_gpio_match),
1661 },
1662};
1663
1664/*
1665 * gpio driver register needs to be done before
1666 * machine_init functions access gpio APIs.
1667 * Hence omap_gpio_drv_reg() is a postcore_initcall.
1668 */
1669static int __init omap_gpio_drv_reg(void)
1670{
1671 return platform_driver_register(&omap_gpio_driver);
1672}
1673postcore_initcall(omap_gpio_drv_reg);
1674
1675static void __exit omap_gpio_exit(void)
1676{
1677 platform_driver_unregister(&omap_gpio_driver);
1678}
1679module_exit(omap_gpio_exit);
1680
1681MODULE_DESCRIPTION("omap gpio driver");
1682MODULE_ALIAS("platform:gpio-omap");
1683MODULE_LICENSE("GPL v2");