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gpio: Fix irqchip initialization order
[linux/fpc-iii.git] / drivers / gpio / gpio-omap.c
blobd0f27084a9420e948536bc873676165b04c21890
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Support functions for OMAP GPIO
4 *
5 * Copyright (C) 2003-2005 Nokia Corporation
6 * Written by Juha Yrjölä <juha.yrjola@nokia.com>
7 *
8 * Copyright (C) 2009 Texas Instruments
9 * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
10 */
11
12 #include <linux/init.h>
13 #include <linux/module.h>
14 #include <linux/interrupt.h>
15 #include <linux/syscore_ops.h>
16 #include <linux/err.h>
17 #include <linux/clk.h>
18 #include <linux/io.h>
19 #include <linux/cpu_pm.h>
20 #include <linux/device.h>
21 #include <linux/pm_runtime.h>
22 #include <linux/pm.h>
23 #include <linux/of.h>
24 #include <linux/of_device.h>
25 #include <linux/gpio/driver.h>
26 #include <linux/bitops.h>
27 #include <linux/platform_data/gpio-omap.h>
28
29 #define OMAP4_GPIO_DEBOUNCINGTIME_MASK 0xFF
30
31 struct gpio_regs {
32 u32 irqenable1;
33 u32 irqenable2;
34 u32 wake_en;
35 u32 ctrl;
36 u32 oe;
37 u32 leveldetect0;
38 u32 leveldetect1;
39 u32 risingdetect;
40 u32 fallingdetect;
41 u32 dataout;
42 u32 debounce;
43 u32 debounce_en;
44 };
45
46 struct gpio_bank {
47 void __iomem *base;
48 const struct omap_gpio_reg_offs *regs;
49
50 int irq;
51 u32 non_wakeup_gpios;
52 u32 enabled_non_wakeup_gpios;
53 struct gpio_regs context;
54 u32 saved_datain;
55 u32 level_mask;
56 u32 toggle_mask;
57 raw_spinlock_t lock;
58 raw_spinlock_t wa_lock;
59 struct gpio_chip chip;
60 struct clk *dbck;
61 struct notifier_block nb;
62 unsigned int is_suspended:1;
63 u32 mod_usage;
64 u32 irq_usage;
65 u32 dbck_enable_mask;
66 bool dbck_enabled;
67 bool is_mpuio;
68 bool dbck_flag;
69 bool loses_context;
70 bool context_valid;
71 int stride;
72 u32 width;
73 int context_loss_count;
74
75 void (*set_dataout)(struct gpio_bank *bank, unsigned gpio, int enable);
76 int (*get_context_loss_count)(struct device *dev);
77 };
78
79 #define GPIO_MOD_CTRL_BIT BIT(0)
80
81 #define BANK_USED(bank) (bank->mod_usage || bank->irq_usage)
82 #define LINE_USED(line, offset) (line & (BIT(offset)))
83
84 static void omap_gpio_unmask_irq(struct irq_data *d);
85
86 static inline struct gpio_bank *omap_irq_data_get_bank(struct irq_data *d)
87 {
88 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
89 return gpiochip_get_data(chip);
90 }
91
92 static inline u32 omap_gpio_rmw(void __iomem *reg, u32 mask, bool set)
93 {
94 u32 val = readl_relaxed(reg);
95
96 if (set)
97 val |= mask;
98 else
99 val &= ~mask;
100
101 writel_relaxed(val, reg);
102
103 return val;
104 }
105
106 static void omap_set_gpio_direction(struct gpio_bank *bank, int gpio,
107 int is_input)
108 {
109 bank->context.oe = omap_gpio_rmw(bank->base + bank->regs->direction,
110 BIT(gpio), is_input);
111 }
112
113
114 /* set data out value using dedicate set/clear register */
115 static void omap_set_gpio_dataout_reg(struct gpio_bank *bank, unsigned offset,
116 int enable)
117 {
118 void __iomem *reg = bank->base;
119 u32 l = BIT(offset);
120
121 if (enable) {
122 reg += bank->regs->set_dataout;
123 bank->context.dataout |= l;
124 } else {
125 reg += bank->regs->clr_dataout;
126 bank->context.dataout &= ~l;
127 }
128
129 writel_relaxed(l, reg);
130 }
131
132 /* set data out value using mask register */
133 static void omap_set_gpio_dataout_mask(struct gpio_bank *bank, unsigned offset,
134 int enable)
135 {
136 bank->context.dataout = omap_gpio_rmw(bank->base + bank->regs->dataout,
137 BIT(offset), enable);
138 }
139
140 static inline void omap_gpio_dbck_enable(struct gpio_bank *bank)
141 {
142 if (bank->dbck_enable_mask && !bank->dbck_enabled) {
143 clk_enable(bank->dbck);
144 bank->dbck_enabled = true;
145
146 writel_relaxed(bank->dbck_enable_mask,
147 bank->base + bank->regs->debounce_en);
148 }
149 }
150
151 static inline void omap_gpio_dbck_disable(struct gpio_bank *bank)
152 {
153 if (bank->dbck_enable_mask && bank->dbck_enabled) {
154 /*
155 * Disable debounce before cutting it's clock. If debounce is
156 * enabled but the clock is not, GPIO module seems to be unable
157 * to detect events and generate interrupts at least on OMAP3.
158 */
159 writel_relaxed(0, bank->base + bank->regs->debounce_en);
160
161 clk_disable(bank->dbck);
162 bank->dbck_enabled = false;
163 }
164 }
165
166 /**
167 * omap2_set_gpio_debounce - low level gpio debounce time
168 * @bank: the gpio bank we're acting upon
169 * @offset: the gpio number on this @bank
170 * @debounce: debounce time to use
171 *
172 * OMAP's debounce time is in 31us steps
173 * <debounce time> = (GPIO_DEBOUNCINGTIME[7:0].DEBOUNCETIME + 1) x 31
174 * so we need to convert and round up to the closest unit.
175 *
176 * Return: 0 on success, negative error otherwise.
177 */
178 static int omap2_set_gpio_debounce(struct gpio_bank *bank, unsigned offset,
179 unsigned debounce)
180 {
181 u32 val;
182 u32 l;
183 bool enable = !!debounce;
184
185 if (!bank->dbck_flag)
186 return -ENOTSUPP;
187
188 if (enable) {
189 debounce = DIV_ROUND_UP(debounce, 31) - 1;
190 if ((debounce & OMAP4_GPIO_DEBOUNCINGTIME_MASK) != debounce)
191 return -EINVAL;
192 }
193
194 l = BIT(offset);
195
196 clk_enable(bank->dbck);
197 writel_relaxed(debounce, bank->base + bank->regs->debounce);
198
199 val = omap_gpio_rmw(bank->base + bank->regs->debounce_en, l, enable);
200 bank->dbck_enable_mask = val;
201
202 clk_disable(bank->dbck);
203 /*
204 * Enable debounce clock per module.
205 * This call is mandatory because in omap_gpio_request() when
206 * *_runtime_get_sync() is called, _gpio_dbck_enable() within
207 * runtime callbck fails to turn on dbck because dbck_enable_mask
208 * used within _gpio_dbck_enable() is still not initialized at
209 * that point. Therefore we have to enable dbck here.
210 */
211 omap_gpio_dbck_enable(bank);
212 if (bank->dbck_enable_mask) {
213 bank->context.debounce = debounce;
214 bank->context.debounce_en = val;
215 }
216
217 return 0;
218 }
219
220 /**
221 * omap_clear_gpio_debounce - clear debounce settings for a gpio
222 * @bank: the gpio bank we're acting upon
223 * @offset: the gpio number on this @bank
224 *
225 * If a gpio is using debounce, then clear the debounce enable bit and if
226 * this is the only gpio in this bank using debounce, then clear the debounce
227 * time too. The debounce clock will also be disabled when calling this function
228 * if this is the only gpio in the bank using debounce.
229 */
230 static void omap_clear_gpio_debounce(struct gpio_bank *bank, unsigned offset)
231 {
232 u32 gpio_bit = BIT(offset);
233
234 if (!bank->dbck_flag)
235 return;
236
237 if (!(bank->dbck_enable_mask & gpio_bit))
238 return;
239
240 bank->dbck_enable_mask &= ~gpio_bit;
241 bank->context.debounce_en &= ~gpio_bit;
242 writel_relaxed(bank->context.debounce_en,
243 bank->base + bank->regs->debounce_en);
244
245 if (!bank->dbck_enable_mask) {
246 bank->context.debounce = 0;
247 writel_relaxed(bank->context.debounce, bank->base +
248 bank->regs->debounce);
249 clk_disable(bank->dbck);
250 bank->dbck_enabled = false;
251 }
252 }
253
254 /*
255 * Off mode wake-up capable GPIOs in bank(s) that are in the wakeup domain.
256 * See TRM section for GPIO for "Wake-Up Generation" for the list of GPIOs
257 * in wakeup domain. If bank->non_wakeup_gpios is not configured, assume none
258 * are capable waking up the system from off mode.
259 */
260 static bool omap_gpio_is_off_wakeup_capable(struct gpio_bank *bank, u32 gpio_mask)
261 {
262 u32 no_wake = bank->non_wakeup_gpios;
263
264 if (no_wake)
265 return !!(~no_wake & gpio_mask);
266
267 return false;
268 }
269
270 static inline void omap_set_gpio_trigger(struct gpio_bank *bank, int gpio,
271 unsigned trigger)
272 {
273 void __iomem *base = bank->base;
274 u32 gpio_bit = BIT(gpio);
275
276 omap_gpio_rmw(base + bank->regs->leveldetect0, gpio_bit,
277 trigger & IRQ_TYPE_LEVEL_LOW);
278 omap_gpio_rmw(base + bank->regs->leveldetect1, gpio_bit,
279 trigger & IRQ_TYPE_LEVEL_HIGH);
280
281 /*
282 * We need the edge detection enabled for to allow the GPIO block
283 * to be woken from idle state. Set the appropriate edge detection
284 * in addition to the level detection.
285 */
286 omap_gpio_rmw(base + bank->regs->risingdetect, gpio_bit,
287 trigger & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_LEVEL_HIGH));
288 omap_gpio_rmw(base + bank->regs->fallingdetect, gpio_bit,
289 trigger & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_LEVEL_LOW));
290
291 bank->context.leveldetect0 =
292 readl_relaxed(bank->base + bank->regs->leveldetect0);
293 bank->context.leveldetect1 =
294 readl_relaxed(bank->base + bank->regs->leveldetect1);
295 bank->context.risingdetect =
296 readl_relaxed(bank->base + bank->regs->risingdetect);
297 bank->context.fallingdetect =
298 readl_relaxed(bank->base + bank->regs->fallingdetect);
299
300 bank->level_mask = bank->context.leveldetect0 |
301 bank->context.leveldetect1;
302
303 /* This part needs to be executed always for OMAP{34xx, 44xx} */
304 if (!bank->regs->irqctrl && !omap_gpio_is_off_wakeup_capable(bank, gpio)) {
305 /*
306 * Log the edge gpio and manually trigger the IRQ
307 * after resume if the input level changes
308 * to avoid irq lost during PER RET/OFF mode
309 * Applies for omap2 non-wakeup gpio and all omap3 gpios
310 */
311 if (trigger & IRQ_TYPE_EDGE_BOTH)
312 bank->enabled_non_wakeup_gpios |= gpio_bit;
313 else
314 bank->enabled_non_wakeup_gpios &= ~gpio_bit;
315 }
316 }
317
318 /*
319 * This only applies to chips that can't do both rising and falling edge
320 * detection at once. For all other chips, this function is a noop.
321 */
322 static void omap_toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio)
323 {
324 if (IS_ENABLED(CONFIG_ARCH_OMAP1) && bank->regs->irqctrl) {
325 void __iomem *reg = bank->base + bank->regs->irqctrl;
326
327 writel_relaxed(readl_relaxed(reg) ^ BIT(gpio), reg);
328 }
329 }
330
331 static int omap_set_gpio_triggering(struct gpio_bank *bank, int gpio,
332 unsigned trigger)
333 {
334 void __iomem *reg = bank->base;
335 u32 l = 0;
336
337 if (bank->regs->leveldetect0 && bank->regs->wkup_en) {
338 omap_set_gpio_trigger(bank, gpio, trigger);
339 } else if (bank->regs->irqctrl) {
340 reg += bank->regs->irqctrl;
341
342 l = readl_relaxed(reg);
343 if ((trigger & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH)
344 bank->toggle_mask |= BIT(gpio);
345 if (trigger & IRQ_TYPE_EDGE_RISING)
346 l |= BIT(gpio);
347 else if (trigger & IRQ_TYPE_EDGE_FALLING)
348 l &= ~(BIT(gpio));
349 else
350 return -EINVAL;
351
352 writel_relaxed(l, reg);
353 } else if (bank->regs->edgectrl1) {
354 if (gpio & 0x08)
355 reg += bank->regs->edgectrl2;
356 else
357 reg += bank->regs->edgectrl1;
358
359 gpio &= 0x07;
360 l = readl_relaxed(reg);
361 l &= ~(3 << (gpio << 1));
362 if (trigger & IRQ_TYPE_EDGE_RISING)
363 l |= 2 << (gpio << 1);
364 if (trigger & IRQ_TYPE_EDGE_FALLING)
365 l |= BIT(gpio << 1);
366 writel_relaxed(l, reg);
367 }
368 return 0;
369 }
370
371 static void omap_enable_gpio_module(struct gpio_bank *bank, unsigned offset)
372 {
373 if (bank->regs->pinctrl) {
374 void __iomem *reg = bank->base + bank->regs->pinctrl;
375
376 /* Claim the pin for MPU */
377 writel_relaxed(readl_relaxed(reg) | (BIT(offset)), reg);
378 }
379
380 if (bank->regs->ctrl && !BANK_USED(bank)) {
381 void __iomem *reg = bank->base + bank->regs->ctrl;
382 u32 ctrl;
383
384 ctrl = readl_relaxed(reg);
385 /* Module is enabled, clocks are not gated */
386 ctrl &= ~GPIO_MOD_CTRL_BIT;
387 writel_relaxed(ctrl, reg);
388 bank->context.ctrl = ctrl;
389 }
390 }
391
392 static void omap_disable_gpio_module(struct gpio_bank *bank, unsigned offset)
393 {
394 if (bank->regs->ctrl && !BANK_USED(bank)) {
395 void __iomem *reg = bank->base + bank->regs->ctrl;
396 u32 ctrl;
397
398 ctrl = readl_relaxed(reg);
399 /* Module is disabled, clocks are gated */
400 ctrl |= GPIO_MOD_CTRL_BIT;
401 writel_relaxed(ctrl, reg);
402 bank->context.ctrl = ctrl;
403 }
404 }
405
406 static int omap_gpio_is_input(struct gpio_bank *bank, unsigned offset)
407 {
408 void __iomem *reg = bank->base + bank->regs->direction;
409
410 return readl_relaxed(reg) & BIT(offset);
411 }
412
413 static void omap_gpio_init_irq(struct gpio_bank *bank, unsigned offset)
414 {
415 if (!LINE_USED(bank->mod_usage, offset)) {
416 omap_enable_gpio_module(bank, offset);
417 omap_set_gpio_direction(bank, offset, 1);
418 }
419 bank->irq_usage |= BIT(offset);
420 }
421
422 static int omap_gpio_irq_type(struct irq_data *d, unsigned type)
423 {
424 struct gpio_bank *bank = omap_irq_data_get_bank(d);
425 int retval;
426 unsigned long flags;
427 unsigned offset = d->hwirq;
428
429 if (type & ~IRQ_TYPE_SENSE_MASK)
430 return -EINVAL;
431
432 if (!bank->regs->leveldetect0 &&
433 (type & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH)))
434 return -EINVAL;
435
436 raw_spin_lock_irqsave(&bank->lock, flags);
437 retval = omap_set_gpio_triggering(bank, offset, type);
438 if (retval) {
439 raw_spin_unlock_irqrestore(&bank->lock, flags);
440 goto error;
441 }
442 omap_gpio_init_irq(bank, offset);
443 if (!omap_gpio_is_input(bank, offset)) {
444 raw_spin_unlock_irqrestore(&bank->lock, flags);
445 retval = -EINVAL;
446 goto error;
447 }
448 raw_spin_unlock_irqrestore(&bank->lock, flags);
449
450 if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
451 irq_set_handler_locked(d, handle_level_irq);
452 else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
453 /*
454 * Edge IRQs are already cleared/acked in irq_handler and
455 * not need to be masked, as result handle_edge_irq()
456 * logic is excessed here and may cause lose of interrupts.
457 * So just use handle_simple_irq.
458 */
459 irq_set_handler_locked(d, handle_simple_irq);
460
461 return 0;
462
463 error:
464 return retval;
465 }
466
467 static void omap_clear_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
468 {
469 void __iomem *reg = bank->base;
470
471 reg += bank->regs->irqstatus;
472 writel_relaxed(gpio_mask, reg);
473
474 /* Workaround for clearing DSP GPIO interrupts to allow retention */
475 if (bank->regs->irqstatus2) {
476 reg = bank->base + bank->regs->irqstatus2;
477 writel_relaxed(gpio_mask, reg);
478 }
479
480 /* Flush posted write for the irq status to avoid spurious interrupts */
481 readl_relaxed(reg);
482 }
483
484 static inline void omap_clear_gpio_irqstatus(struct gpio_bank *bank,
485 unsigned offset)
486 {
487 omap_clear_gpio_irqbank(bank, BIT(offset));
488 }
489
490 static u32 omap_get_gpio_irqbank_mask(struct gpio_bank *bank)
491 {
492 void __iomem *reg = bank->base;
493 u32 l;
494 u32 mask = (BIT(bank->width)) - 1;
495
496 reg += bank->regs->irqenable;
497 l = readl_relaxed(reg);
498 if (bank->regs->irqenable_inv)
499 l = ~l;
500 l &= mask;
501 return l;
502 }
503
504 static inline void omap_set_gpio_irqenable(struct gpio_bank *bank,
505 unsigned offset, int enable)
506 {
507 void __iomem *reg = bank->base;
508 u32 gpio_mask = BIT(offset);
509
510 if (bank->regs->set_irqenable && bank->regs->clr_irqenable) {
511 if (enable) {
512 reg += bank->regs->set_irqenable;
513 bank->context.irqenable1 |= gpio_mask;
514 } else {
515 reg += bank->regs->clr_irqenable;
516 bank->context.irqenable1 &= ~gpio_mask;
517 }
518 writel_relaxed(gpio_mask, reg);
519 } else {
520 bank->context.irqenable1 =
521 omap_gpio_rmw(reg + bank->regs->irqenable, gpio_mask,
522 enable ^ bank->regs->irqenable_inv);
523 }
524
525 /*
526 * Program GPIO wakeup along with IRQ enable to satisfy OMAP4430 TRM
527 * note requiring correlation between the IRQ enable registers and
528 * the wakeup registers. In any case, we want wakeup from idle
529 * enabled for the GPIOs which support this feature.
530 */
531 if (bank->regs->wkup_en &&
532 (bank->regs->edgectrl1 || !(bank->non_wakeup_gpios & gpio_mask))) {
533 bank->context.wake_en =
534 omap_gpio_rmw(bank->base + bank->regs->wkup_en,
535 gpio_mask, enable);
536 }
537 }
538
539 /* Use disable_irq_wake() and enable_irq_wake() functions from drivers */
540 static int omap_gpio_wake_enable(struct irq_data *d, unsigned int enable)
541 {
542 struct gpio_bank *bank = omap_irq_data_get_bank(d);
543
544 return irq_set_irq_wake(bank->irq, enable);
545 }
546
547 /*
548 * We need to unmask the GPIO bank interrupt as soon as possible to
549 * avoid missing GPIO interrupts for other lines in the bank.
550 * Then we need to mask-read-clear-unmask the triggered GPIO lines
551 * in the bank to avoid missing nested interrupts for a GPIO line.
552 * If we wait to unmask individual GPIO lines in the bank after the
553 * line's interrupt handler has been run, we may miss some nested
554 * interrupts.
555 */
556 static irqreturn_t omap_gpio_irq_handler(int irq, void *gpiobank)
557 {
558 void __iomem *isr_reg = NULL;
559 u32 enabled, isr, edge;
560 unsigned int bit;
561 struct gpio_bank *bank = gpiobank;
562 unsigned long wa_lock_flags;
563 unsigned long lock_flags;
564
565 isr_reg = bank->base + bank->regs->irqstatus;
566 if (WARN_ON(!isr_reg))
567 goto exit;
568
569 if (WARN_ONCE(!pm_runtime_active(bank->chip.parent),
570 "gpio irq%i while runtime suspended?\n", irq))
571 return IRQ_NONE;
572
573 while (1) {
574 raw_spin_lock_irqsave(&bank->lock, lock_flags);
575
576 enabled = omap_get_gpio_irqbank_mask(bank);
577 isr = readl_relaxed(isr_reg) & enabled;
578
579 /*
580 * Clear edge sensitive interrupts before calling handler(s)
581 * so subsequent edge transitions are not missed while the
582 * handlers are running.
583 */
584 edge = isr & ~bank->level_mask;
585 if (edge)
586 omap_clear_gpio_irqbank(bank, edge);
587
588 raw_spin_unlock_irqrestore(&bank->lock, lock_flags);
589
590 if (!isr)
591 break;
592
593 while (isr) {
594 bit = __ffs(isr);
595 isr &= ~(BIT(bit));
596
597 raw_spin_lock_irqsave(&bank->lock, lock_flags);
598 /*
599 * Some chips can't respond to both rising and falling
600 * at the same time. If this irq was requested with
601 * both flags, we need to flip the ICR data for the IRQ
602 * to respond to the IRQ for the opposite direction.
603 * This will be indicated in the bank toggle_mask.
604 */
605 if (bank->toggle_mask & (BIT(bit)))
606 omap_toggle_gpio_edge_triggering(bank, bit);
607
608 raw_spin_unlock_irqrestore(&bank->lock, lock_flags);
609
610 raw_spin_lock_irqsave(&bank->wa_lock, wa_lock_flags);
611
612 generic_handle_irq(irq_find_mapping(bank->chip.irq.domain,
613 bit));
614
615 raw_spin_unlock_irqrestore(&bank->wa_lock,
616 wa_lock_flags);
617 }
618 }
619 exit:
620 return IRQ_HANDLED;
621 }
622
623 static unsigned int omap_gpio_irq_startup(struct irq_data *d)
624 {
625 struct gpio_bank *bank = omap_irq_data_get_bank(d);
626 unsigned long flags;
627 unsigned offset = d->hwirq;
628
629 raw_spin_lock_irqsave(&bank->lock, flags);
630
631 if (!LINE_USED(bank->mod_usage, offset))
632 omap_set_gpio_direction(bank, offset, 1);
633 omap_enable_gpio_module(bank, offset);
634 bank->irq_usage |= BIT(offset);
635
636 raw_spin_unlock_irqrestore(&bank->lock, flags);
637 omap_gpio_unmask_irq(d);
638
639 return 0;
640 }
641
642 static void omap_gpio_irq_shutdown(struct irq_data *d)
643 {
644 struct gpio_bank *bank = omap_irq_data_get_bank(d);
645 unsigned long flags;
646 unsigned offset = d->hwirq;
647
648 raw_spin_lock_irqsave(&bank->lock, flags);
649 bank->irq_usage &= ~(BIT(offset));
650 omap_set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);
651 omap_clear_gpio_irqstatus(bank, offset);
652 omap_set_gpio_irqenable(bank, offset, 0);
653 if (!LINE_USED(bank->mod_usage, offset))
654 omap_clear_gpio_debounce(bank, offset);
655 omap_disable_gpio_module(bank, offset);
656 raw_spin_unlock_irqrestore(&bank->lock, flags);
657 }
658
659 static void omap_gpio_irq_bus_lock(struct irq_data *data)
660 {
661 struct gpio_bank *bank = omap_irq_data_get_bank(data);
662
663 pm_runtime_get_sync(bank->chip.parent);
664 }
665
666 static void gpio_irq_bus_sync_unlock(struct irq_data *data)
667 {
668 struct gpio_bank *bank = omap_irq_data_get_bank(data);
669
670 pm_runtime_put(bank->chip.parent);
671 }
672
673 static void omap_gpio_mask_irq(struct irq_data *d)
674 {
675 struct gpio_bank *bank = omap_irq_data_get_bank(d);
676 unsigned offset = d->hwirq;
677 unsigned long flags;
678
679 raw_spin_lock_irqsave(&bank->lock, flags);
680 omap_set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);
681 omap_set_gpio_irqenable(bank, offset, 0);
682 raw_spin_unlock_irqrestore(&bank->lock, flags);
683 }
684
685 static void omap_gpio_unmask_irq(struct irq_data *d)
686 {
687 struct gpio_bank *bank = omap_irq_data_get_bank(d);
688 unsigned offset = d->hwirq;
689 u32 trigger = irqd_get_trigger_type(d);
690 unsigned long flags;
691
692 raw_spin_lock_irqsave(&bank->lock, flags);
693 omap_set_gpio_irqenable(bank, offset, 1);
694
695 /*
696 * For level-triggered GPIOs, clearing must be done after the source
697 * is cleared, thus after the handler has run. OMAP4 needs this done
698 * after enabing the interrupt to clear the wakeup status.
699 */
700 if (bank->regs->leveldetect0 && bank->regs->wkup_en &&
701 trigger & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
702 omap_clear_gpio_irqstatus(bank, offset);
703
704 if (trigger)
705 omap_set_gpio_triggering(bank, offset, trigger);
706
707 raw_spin_unlock_irqrestore(&bank->lock, flags);
708 }
709
710 /*---------------------------------------------------------------------*/
711
712 static int omap_mpuio_suspend_noirq(struct device *dev)
713 {
714 struct gpio_bank *bank = dev_get_drvdata(dev);
715 void __iomem *mask_reg = bank->base +
716 OMAP_MPUIO_GPIO_MASKIT / bank->stride;
717 unsigned long flags;
718
719 raw_spin_lock_irqsave(&bank->lock, flags);
720 writel_relaxed(0xffff & ~bank->context.wake_en, mask_reg);
721 raw_spin_unlock_irqrestore(&bank->lock, flags);
722
723 return 0;
724 }
725
726 static int omap_mpuio_resume_noirq(struct device *dev)
727 {
728 struct gpio_bank *bank = dev_get_drvdata(dev);
729 void __iomem *mask_reg = bank->base +
730 OMAP_MPUIO_GPIO_MASKIT / bank->stride;
731 unsigned long flags;
732
733 raw_spin_lock_irqsave(&bank->lock, flags);
734 writel_relaxed(bank->context.wake_en, mask_reg);
735 raw_spin_unlock_irqrestore(&bank->lock, flags);
736
737 return 0;
738 }
739
740 static const struct dev_pm_ops omap_mpuio_dev_pm_ops = {
741 .suspend_noirq = omap_mpuio_suspend_noirq,
742 .resume_noirq = omap_mpuio_resume_noirq,
743 };
744
745 /* use platform_driver for this. */
746 static struct platform_driver omap_mpuio_driver = {
747 .driver = {
748 .name = "mpuio",
749 .pm = &omap_mpuio_dev_pm_ops,
750 },
751 };
752
753 static struct platform_device omap_mpuio_device = {
754 .name = "mpuio",
755 .id = -1,
756 .dev = {
757 .driver = &omap_mpuio_driver.driver,
758 }
759 /* could list the /proc/iomem resources */
760 };
761
762 static inline void omap_mpuio_init(struct gpio_bank *bank)
763 {
764 platform_set_drvdata(&omap_mpuio_device, bank);
765
766 if (platform_driver_register(&omap_mpuio_driver) == 0)
767 (void) platform_device_register(&omap_mpuio_device);
768 }
769
770 /*---------------------------------------------------------------------*/
771
772 static int omap_gpio_request(struct gpio_chip *chip, unsigned offset)
773 {
774 struct gpio_bank *bank = gpiochip_get_data(chip);
775 unsigned long flags;
776
777 pm_runtime_get_sync(chip->parent);
778
779 raw_spin_lock_irqsave(&bank->lock, flags);
780 omap_enable_gpio_module(bank, offset);
781 bank->mod_usage |= BIT(offset);
782 raw_spin_unlock_irqrestore(&bank->lock, flags);
783
784 return 0;
785 }
786
787 static void omap_gpio_free(struct gpio_chip *chip, unsigned offset)
788 {
789 struct gpio_bank *bank = gpiochip_get_data(chip);
790 unsigned long flags;
791
792 raw_spin_lock_irqsave(&bank->lock, flags);
793 bank->mod_usage &= ~(BIT(offset));
794 if (!LINE_USED(bank->irq_usage, offset)) {
795 omap_set_gpio_direction(bank, offset, 1);
796 omap_clear_gpio_debounce(bank, offset);
797 }
798 omap_disable_gpio_module(bank, offset);
799 raw_spin_unlock_irqrestore(&bank->lock, flags);
800
801 pm_runtime_put(chip->parent);
802 }
803
804 static int omap_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
805 {
806 struct gpio_bank *bank = gpiochip_get_data(chip);
807
808 return !!(readl_relaxed(bank->base + bank->regs->direction) &
809 BIT(offset));
810 }
811
812 static int omap_gpio_input(struct gpio_chip *chip, unsigned offset)
813 {
814 struct gpio_bank *bank;
815 unsigned long flags;
816
817 bank = gpiochip_get_data(chip);
818 raw_spin_lock_irqsave(&bank->lock, flags);
819 omap_set_gpio_direction(bank, offset, 1);
820 raw_spin_unlock_irqrestore(&bank->lock, flags);
821 return 0;
822 }
823
824 static int omap_gpio_get(struct gpio_chip *chip, unsigned offset)
825 {
826 struct gpio_bank *bank = gpiochip_get_data(chip);
827 void __iomem *reg;
828
829 if (omap_gpio_is_input(bank, offset))
830 reg = bank->base + bank->regs->datain;
831 else
832 reg = bank->base + bank->regs->dataout;
833
834 return (readl_relaxed(reg) & BIT(offset)) != 0;
835 }
836
837 static int omap_gpio_output(struct gpio_chip *chip, unsigned offset, int value)
838 {
839 struct gpio_bank *bank;
840 unsigned long flags;
841
842 bank = gpiochip_get_data(chip);
843 raw_spin_lock_irqsave(&bank->lock, flags);
844 bank->set_dataout(bank, offset, value);
845 omap_set_gpio_direction(bank, offset, 0);
846 raw_spin_unlock_irqrestore(&bank->lock, flags);
847 return 0;
848 }
849
850 static int omap_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,
851 unsigned long *bits)
852 {
853 struct gpio_bank *bank = gpiochip_get_data(chip);
854 void __iomem *base = bank->base;
855 u32 direction, m, val = 0;
856
857 direction = readl_relaxed(base + bank->regs->direction);
858
859 m = direction & *mask;
860 if (m)
861 val |= readl_relaxed(base + bank->regs->datain) & m;
862
863 m = ~direction & *mask;
864 if (m)
865 val |= readl_relaxed(base + bank->regs->dataout) & m;
866
867 *bits = val;
868
869 return 0;
870 }
871
872 static int omap_gpio_debounce(struct gpio_chip *chip, unsigned offset,
873 unsigned debounce)
874 {
875 struct gpio_bank *bank;
876 unsigned long flags;
877 int ret;
878
879 bank = gpiochip_get_data(chip);
880
881 raw_spin_lock_irqsave(&bank->lock, flags);
882 ret = omap2_set_gpio_debounce(bank, offset, debounce);
883 raw_spin_unlock_irqrestore(&bank->lock, flags);
884
885 if (ret)
886 dev_info(chip->parent,
887 "Could not set line %u debounce to %u microseconds (%d)",
888 offset, debounce, ret);
889
890 return ret;
891 }
892
893 static int omap_gpio_set_config(struct gpio_chip *chip, unsigned offset,
894 unsigned long config)
895 {
896 u32 debounce;
897
898 if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE)
899 return -ENOTSUPP;
900
901 debounce = pinconf_to_config_argument(config);
902 return omap_gpio_debounce(chip, offset, debounce);
903 }
904
905 static void omap_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
906 {
907 struct gpio_bank *bank;
908 unsigned long flags;
909
910 bank = gpiochip_get_data(chip);
911 raw_spin_lock_irqsave(&bank->lock, flags);
912 bank->set_dataout(bank, offset, value);
913 raw_spin_unlock_irqrestore(&bank->lock, flags);
914 }
915
916 static void omap_gpio_set_multiple(struct gpio_chip *chip, unsigned long *mask,
917 unsigned long *bits)
918 {
919 struct gpio_bank *bank = gpiochip_get_data(chip);
920 void __iomem *reg = bank->base + bank->regs->dataout;
921 unsigned long flags;
922 u32 l;
923
924 raw_spin_lock_irqsave(&bank->lock, flags);
925 l = (readl_relaxed(reg) & ~*mask) | (*bits & *mask);
926 writel_relaxed(l, reg);
927 bank->context.dataout = l;
928 raw_spin_unlock_irqrestore(&bank->lock, flags);
929 }
930
931 /*---------------------------------------------------------------------*/
932
933 static void omap_gpio_show_rev(struct gpio_bank *bank)
934 {
935 static bool called;
936 u32 rev;
937
938 if (called || bank->regs->revision == USHRT_MAX)
939 return;
940
941 rev = readw_relaxed(bank->base + bank->regs->revision);
942 pr_info("OMAP GPIO hardware version %d.%d\n",
943 (rev >> 4) & 0x0f, rev & 0x0f);
944
945 called = true;
946 }
947
948 static void omap_gpio_mod_init(struct gpio_bank *bank)
949 {
950 void __iomem *base = bank->base;
951 u32 l = 0xffffffff;
952
953 if (bank->width == 16)
954 l = 0xffff;
955
956 if (bank->is_mpuio) {
957 writel_relaxed(l, bank->base + bank->regs->irqenable);
958 return;
959 }
960
961 omap_gpio_rmw(base + bank->regs->irqenable, l,
962 bank->regs->irqenable_inv);
963 omap_gpio_rmw(base + bank->regs->irqstatus, l,
964 !bank->regs->irqenable_inv);
965 if (bank->regs->debounce_en)
966 writel_relaxed(0, base + bank->regs->debounce_en);
967
968 /* Save OE default value (0xffffffff) in the context */
969 bank->context.oe = readl_relaxed(bank->base + bank->regs->direction);
970 /* Initialize interface clk ungated, module enabled */
971 if (bank->regs->ctrl)
972 writel_relaxed(0, base + bank->regs->ctrl);
973 }
974
975 static int omap_gpio_chip_init(struct gpio_bank *bank, struct irq_chip *irqc)
976 {
977 struct gpio_irq_chip *irq;
978 static int gpio;
979 const char *label;
980 int irq_base = 0;
981 int ret;
982
983 /*
984 * REVISIT eventually switch from OMAP-specific gpio structs
985 * over to the generic ones
986 */
987 bank->chip.request = omap_gpio_request;
988 bank->chip.free = omap_gpio_free;
989 bank->chip.get_direction = omap_gpio_get_direction;
990 bank->chip.direction_input = omap_gpio_input;
991 bank->chip.get = omap_gpio_get;
992 bank->chip.get_multiple = omap_gpio_get_multiple;
993 bank->chip.direction_output = omap_gpio_output;
994 bank->chip.set_config = omap_gpio_set_config;
995 bank->chip.set = omap_gpio_set;
996 bank->chip.set_multiple = omap_gpio_set_multiple;
997 if (bank->is_mpuio) {
998 bank->chip.label = "mpuio";
999 if (bank->regs->wkup_en)
1000 bank->chip.parent = &omap_mpuio_device.dev;
1001 bank->chip.base = OMAP_MPUIO(0);
1002 } else {
1003 label = devm_kasprintf(bank->chip.parent, GFP_KERNEL, "gpio-%d-%d",
1004 gpio, gpio + bank->width - 1);
1005 if (!label)
1006 return -ENOMEM;
1007 bank->chip.label = label;
1008 bank->chip.base = gpio;
1009 }
1010 bank->chip.ngpio = bank->width;
1011
1012 #ifdef CONFIG_ARCH_OMAP1
1013 /*
1014 * REVISIT: Once we have OMAP1 supporting SPARSE_IRQ, we can drop
1015 * irq_alloc_descs() since a base IRQ offset will no longer be needed.
1016 */
1017 irq_base = devm_irq_alloc_descs(bank->chip.parent,
1018 -1, 0, bank->width, 0);
1019 if (irq_base < 0) {
1020 dev_err(bank->chip.parent, "Couldn't allocate IRQ numbers\n");
1021 return -ENODEV;
1022 }
1023 #endif
1024
1025 /* MPUIO is a bit different, reading IRQ status clears it */
1026 if (bank->is_mpuio && !bank->regs->wkup_en)
1027 irqc->irq_set_wake = NULL;
1028
1029 irq = &bank->chip.irq;
1030 irq->chip = irqc;
1031 irq->handler = handle_bad_irq;
1032 irq->default_type = IRQ_TYPE_NONE;
1033 irq->num_parents = 1;
1034 irq->parents = &bank->irq;
1035 irq->first = irq_base;
1036
1037 ret = gpiochip_add_data(&bank->chip, bank);
1038 if (ret) {
1039 dev_err(bank->chip.parent,
1040 "Could not register gpio chip %d\n", ret);
1041 return ret;
1042 }
1043
1044 ret = devm_request_irq(bank->chip.parent, bank->irq,
1045 omap_gpio_irq_handler,
1046 0, dev_name(bank->chip.parent), bank);
1047 if (ret)
1048 gpiochip_remove(&bank->chip);
1049
1050 if (!bank->is_mpuio)
1051 gpio += bank->width;
1052
1053 return ret;
1054 }
1055
1056 static void omap_gpio_init_context(struct gpio_bank *p)
1057 {
1058 const struct omap_gpio_reg_offs *regs = p->regs;
1059 void __iomem *base = p->base;
1060
1061 p->context.ctrl = readl_relaxed(base + regs->ctrl);
1062 p->context.oe = readl_relaxed(base + regs->direction);
1063 p->context.wake_en = readl_relaxed(base + regs->wkup_en);
1064 p->context.leveldetect0 = readl_relaxed(base + regs->leveldetect0);
1065 p->context.leveldetect1 = readl_relaxed(base + regs->leveldetect1);
1066 p->context.risingdetect = readl_relaxed(base + regs->risingdetect);
1067 p->context.fallingdetect = readl_relaxed(base + regs->fallingdetect);
1068 p->context.irqenable1 = readl_relaxed(base + regs->irqenable);
1069 p->context.irqenable2 = readl_relaxed(base + regs->irqenable2);
1070 p->context.dataout = readl_relaxed(base + regs->dataout);
1071
1072 p->context_valid = true;
1073 }
1074
1075 static void omap_gpio_restore_context(struct gpio_bank *bank)
1076 {
1077 const struct omap_gpio_reg_offs *regs = bank->regs;
1078 void __iomem *base = bank->base;
1079
1080 writel_relaxed(bank->context.wake_en, base + regs->wkup_en);
1081 writel_relaxed(bank->context.ctrl, base + regs->ctrl);
1082 writel_relaxed(bank->context.leveldetect0, base + regs->leveldetect0);
1083 writel_relaxed(bank->context.leveldetect1, base + regs->leveldetect1);
1084 writel_relaxed(bank->context.risingdetect, base + regs->risingdetect);
1085 writel_relaxed(bank->context.fallingdetect, base + regs->fallingdetect);
1086 writel_relaxed(bank->context.dataout, base + regs->dataout);
1087 writel_relaxed(bank->context.oe, base + regs->direction);
1088
1089 if (bank->dbck_enable_mask) {
1090 writel_relaxed(bank->context.debounce, base + regs->debounce);
1091 writel_relaxed(bank->context.debounce_en,
1092 base + regs->debounce_en);
1093 }
1094
1095 writel_relaxed(bank->context.irqenable1, base + regs->irqenable);
1096 writel_relaxed(bank->context.irqenable2, base + regs->irqenable2);
1097 }
1098
1099 static void omap_gpio_idle(struct gpio_bank *bank, bool may_lose_context)
1100 {
1101 struct device *dev = bank->chip.parent;
1102 void __iomem *base = bank->base;
1103 u32 mask, nowake;
1104
1105 bank->saved_datain = readl_relaxed(base + bank->regs->datain);
1106
1107 if (!bank->enabled_non_wakeup_gpios)
1108 goto update_gpio_context_count;
1109
1110 /* Check for pending EDGE_FALLING, ignore EDGE_BOTH */
1111 mask = bank->enabled_non_wakeup_gpios & bank->context.fallingdetect;
1112 mask &= ~bank->context.risingdetect;
1113 bank->saved_datain |= mask;
1114
1115 /* Check for pending EDGE_RISING, ignore EDGE_BOTH */
1116 mask = bank->enabled_non_wakeup_gpios & bank->context.risingdetect;
1117 mask &= ~bank->context.fallingdetect;
1118 bank->saved_datain &= ~mask;
1119
1120 if (!may_lose_context)
1121 goto update_gpio_context_count;
1122
1123 /*
1124 * If going to OFF, remove triggering for all wkup domain
1125 * non-wakeup GPIOs. Otherwise spurious IRQs will be
1126 * generated. See OMAP2420 Errata item 1.101.
1127 */
1128 if (!bank->loses_context && bank->enabled_non_wakeup_gpios) {
1129 nowake = bank->enabled_non_wakeup_gpios;
1130 omap_gpio_rmw(base + bank->regs->fallingdetect, nowake, ~nowake);
1131 omap_gpio_rmw(base + bank->regs->risingdetect, nowake, ~nowake);
1132 }
1133
1134 update_gpio_context_count:
1135 if (bank->get_context_loss_count)
1136 bank->context_loss_count =
1137 bank->get_context_loss_count(dev);
1138
1139 omap_gpio_dbck_disable(bank);
1140 }
1141
1142 static void omap_gpio_unidle(struct gpio_bank *bank)
1143 {
1144 struct device *dev = bank->chip.parent;
1145 u32 l = 0, gen, gen0, gen1;
1146 int c;
1147
1148 /*
1149 * On the first resume during the probe, the context has not
1150 * been initialised and so initialise it now. Also initialise
1151 * the context loss count.
1152 */
1153 if (bank->loses_context && !bank->context_valid) {
1154 omap_gpio_init_context(bank);
1155
1156 if (bank->get_context_loss_count)
1157 bank->context_loss_count =
1158 bank->get_context_loss_count(dev);
1159 }
1160
1161 omap_gpio_dbck_enable(bank);
1162
1163 if (bank->loses_context) {
1164 if (!bank->get_context_loss_count) {
1165 omap_gpio_restore_context(bank);
1166 } else {
1167 c = bank->get_context_loss_count(dev);
1168 if (c != bank->context_loss_count) {
1169 omap_gpio_restore_context(bank);
1170 } else {
1171 return;
1172 }
1173 }
1174 } else {
1175 /* Restore changes done for OMAP2420 errata 1.101 */
1176 writel_relaxed(bank->context.fallingdetect,
1177 bank->base + bank->regs->fallingdetect);
1178 writel_relaxed(bank->context.risingdetect,
1179 bank->base + bank->regs->risingdetect);
1180 }
1181
1182 l = readl_relaxed(bank->base + bank->regs->datain);
1183
1184 /*
1185 * Check if any of the non-wakeup interrupt GPIOs have changed
1186 * state. If so, generate an IRQ by software. This is
1187 * horribly racy, but it's the best we can do to work around
1188 * this silicon bug.
1189 */
1190 l ^= bank->saved_datain;
1191 l &= bank->enabled_non_wakeup_gpios;
1192
1193 /*
1194 * No need to generate IRQs for the rising edge for gpio IRQs
1195 * configured with falling edge only; and vice versa.
1196 */
1197 gen0 = l & bank->context.fallingdetect;
1198 gen0 &= bank->saved_datain;
1199
1200 gen1 = l & bank->context.risingdetect;
1201 gen1 &= ~(bank->saved_datain);
1202
1203 /* FIXME: Consider GPIO IRQs with level detections properly! */
1204 gen = l & (~(bank->context.fallingdetect) &
1205 ~(bank->context.risingdetect));
1206 /* Consider all GPIO IRQs needed to be updated */
1207 gen |= gen0 | gen1;
1208
1209 if (gen) {
1210 u32 old0, old1;
1211
1212 old0 = readl_relaxed(bank->base + bank->regs->leveldetect0);
1213 old1 = readl_relaxed(bank->base + bank->regs->leveldetect1);
1214
1215 if (!bank->regs->irqstatus_raw0) {
1216 writel_relaxed(old0 | gen, bank->base +
1217 bank->regs->leveldetect0);
1218 writel_relaxed(old1 | gen, bank->base +
1219 bank->regs->leveldetect1);
1220 }
1221
1222 if (bank->regs->irqstatus_raw0) {
1223 writel_relaxed(old0 | l, bank->base +
1224 bank->regs->leveldetect0);
1225 writel_relaxed(old1 | l, bank->base +
1226 bank->regs->leveldetect1);
1227 }
1228 writel_relaxed(old0, bank->base + bank->regs->leveldetect0);
1229 writel_relaxed(old1, bank->base + bank->regs->leveldetect1);
1230 }
1231 }
1232
1233 static int gpio_omap_cpu_notifier(struct notifier_block *nb,
1234 unsigned long cmd, void *v)
1235 {
1236 struct gpio_bank *bank;
1237 unsigned long flags;
1238
1239 bank = container_of(nb, struct gpio_bank, nb);
1240
1241 raw_spin_lock_irqsave(&bank->lock, flags);
1242 switch (cmd) {
1243 case CPU_CLUSTER_PM_ENTER:
1244 if (bank->is_suspended)
1245 break;
1246 omap_gpio_idle(bank, true);
1247 break;
1248 case CPU_CLUSTER_PM_ENTER_FAILED:
1249 case CPU_CLUSTER_PM_EXIT:
1250 if (bank->is_suspended)
1251 break;
1252 omap_gpio_unidle(bank);
1253 break;
1254 }
1255 raw_spin_unlock_irqrestore(&bank->lock, flags);
1256
1257 return NOTIFY_OK;
1258 }
1259
1260 static const struct omap_gpio_reg_offs omap2_gpio_regs = {
1261 .revision = OMAP24XX_GPIO_REVISION,
1262 .direction = OMAP24XX_GPIO_OE,
1263 .datain = OMAP24XX_GPIO_DATAIN,
1264 .dataout = OMAP24XX_GPIO_DATAOUT,
1265 .set_dataout = OMAP24XX_GPIO_SETDATAOUT,
1266 .clr_dataout = OMAP24XX_GPIO_CLEARDATAOUT,
1267 .irqstatus = OMAP24XX_GPIO_IRQSTATUS1,
1268 .irqstatus2 = OMAP24XX_GPIO_IRQSTATUS2,
1269 .irqenable = OMAP24XX_GPIO_IRQENABLE1,
1270 .irqenable2 = OMAP24XX_GPIO_IRQENABLE2,
1271 .set_irqenable = OMAP24XX_GPIO_SETIRQENABLE1,
1272 .clr_irqenable = OMAP24XX_GPIO_CLEARIRQENABLE1,
1273 .debounce = OMAP24XX_GPIO_DEBOUNCE_VAL,
1274 .debounce_en = OMAP24XX_GPIO_DEBOUNCE_EN,
1275 .ctrl = OMAP24XX_GPIO_CTRL,
1276 .wkup_en = OMAP24XX_GPIO_WAKE_EN,
1277 .leveldetect0 = OMAP24XX_GPIO_LEVELDETECT0,
1278 .leveldetect1 = OMAP24XX_GPIO_LEVELDETECT1,
1279 .risingdetect = OMAP24XX_GPIO_RISINGDETECT,
1280 .fallingdetect = OMAP24XX_GPIO_FALLINGDETECT,
1281 };
1282
1283 static const struct omap_gpio_reg_offs omap4_gpio_regs = {
1284 .revision = OMAP4_GPIO_REVISION,
1285 .direction = OMAP4_GPIO_OE,
1286 .datain = OMAP4_GPIO_DATAIN,
1287 .dataout = OMAP4_GPIO_DATAOUT,
1288 .set_dataout = OMAP4_GPIO_SETDATAOUT,
1289 .clr_dataout = OMAP4_GPIO_CLEARDATAOUT,
1290 .irqstatus = OMAP4_GPIO_IRQSTATUS0,
1291 .irqstatus2 = OMAP4_GPIO_IRQSTATUS1,
1292 .irqstatus_raw0 = OMAP4_GPIO_IRQSTATUSRAW0,
1293 .irqstatus_raw1 = OMAP4_GPIO_IRQSTATUSRAW1,
1294 .irqenable = OMAP4_GPIO_IRQSTATUSSET0,
1295 .irqenable2 = OMAP4_GPIO_IRQSTATUSSET1,
1296 .set_irqenable = OMAP4_GPIO_IRQSTATUSSET0,
1297 .clr_irqenable = OMAP4_GPIO_IRQSTATUSCLR0,
1298 .debounce = OMAP4_GPIO_DEBOUNCINGTIME,
1299 .debounce_en = OMAP4_GPIO_DEBOUNCENABLE,
1300 .ctrl = OMAP4_GPIO_CTRL,
1301 .wkup_en = OMAP4_GPIO_IRQWAKEN0,
1302 .leveldetect0 = OMAP4_GPIO_LEVELDETECT0,
1303 .leveldetect1 = OMAP4_GPIO_LEVELDETECT1,
1304 .risingdetect = OMAP4_GPIO_RISINGDETECT,
1305 .fallingdetect = OMAP4_GPIO_FALLINGDETECT,
1306 };
1307
1308 static const struct omap_gpio_platform_data omap2_pdata = {
1309 .regs = &omap2_gpio_regs,
1310 .bank_width = 32,
1311 .dbck_flag = false,
1312 };
1313
1314 static const struct omap_gpio_platform_data omap3_pdata = {
1315 .regs = &omap2_gpio_regs,
1316 .bank_width = 32,
1317 .dbck_flag = true,
1318 };
1319
1320 static const struct omap_gpio_platform_data omap4_pdata = {
1321 .regs = &omap4_gpio_regs,
1322 .bank_width = 32,
1323 .dbck_flag = true,
1324 };
1325
1326 static const struct of_device_id omap_gpio_match[] = {
1327 {
1328 .compatible = "ti,omap4-gpio",
1329 .data = &omap4_pdata,
1330 },
1331 {
1332 .compatible = "ti,omap3-gpio",
1333 .data = &omap3_pdata,
1334 },
1335 {
1336 .compatible = "ti,omap2-gpio",
1337 .data = &omap2_pdata,
1338 },
1339 { },
1340 };
1341 MODULE_DEVICE_TABLE(of, omap_gpio_match);
1342
1343 static int omap_gpio_probe(struct platform_device *pdev)
1344 {
1345 struct device *dev = &pdev->dev;
1346 struct device_node *node = dev->of_node;
1347 const struct of_device_id *match;
1348 const struct omap_gpio_platform_data *pdata;
1349 struct gpio_bank *bank;
1350 struct irq_chip *irqc;
1351 int ret;
1352
1353 match = of_match_device(of_match_ptr(omap_gpio_match), dev);
1354
1355 pdata = match ? match->data : dev_get_platdata(dev);
1356 if (!pdata)
1357 return -EINVAL;
1358
1359 bank = devm_kzalloc(dev, sizeof(*bank), GFP_KERNEL);
1360 if (!bank)
1361 return -ENOMEM;
1362
1363 irqc = devm_kzalloc(dev, sizeof(*irqc), GFP_KERNEL);
1364 if (!irqc)
1365 return -ENOMEM;
1366
1367 irqc->irq_startup = omap_gpio_irq_startup,
1368 irqc->irq_shutdown = omap_gpio_irq_shutdown,
1369 irqc->irq_ack = dummy_irq_chip.irq_ack,
1370 irqc->irq_mask = omap_gpio_mask_irq,
1371 irqc->irq_unmask = omap_gpio_unmask_irq,
1372 irqc->irq_set_type = omap_gpio_irq_type,
1373 irqc->irq_set_wake = omap_gpio_wake_enable,
1374 irqc->irq_bus_lock = omap_gpio_irq_bus_lock,
1375 irqc->irq_bus_sync_unlock = gpio_irq_bus_sync_unlock,
1376 irqc->name = dev_name(&pdev->dev);
1377 irqc->flags = IRQCHIP_MASK_ON_SUSPEND;
1378 irqc->parent_device = dev;
1379
1380 bank->irq = platform_get_irq(pdev, 0);
1381 if (bank->irq <= 0) {
1382 if (!bank->irq)
1383 bank->irq = -ENXIO;
1384 if (bank->irq != -EPROBE_DEFER)
1385 dev_err(dev,
1386 "can't get irq resource ret=%d\n", bank->irq);
1387 return bank->irq;
1388 }
1389
1390 bank->chip.parent = dev;
1391 bank->chip.owner = THIS_MODULE;
1392 bank->dbck_flag = pdata->dbck_flag;
1393 bank->stride = pdata->bank_stride;
1394 bank->width = pdata->bank_width;
1395 bank->is_mpuio = pdata->is_mpuio;
1396 bank->non_wakeup_gpios = pdata->non_wakeup_gpios;
1397 bank->regs = pdata->regs;
1398 #ifdef CONFIG_OF_GPIO
1399 bank->chip.of_node = of_node_get(node);
1400 #endif
1401
1402 if (node) {
1403 if (!of_property_read_bool(node, "ti,gpio-always-on"))
1404 bank->loses_context = true;
1405 } else {
1406 bank->loses_context = pdata->loses_context;
1407
1408 if (bank->loses_context)
1409 bank->get_context_loss_count =
1410 pdata->get_context_loss_count;
1411 }
1412
1413 if (bank->regs->set_dataout && bank->regs->clr_dataout)
1414 bank->set_dataout = omap_set_gpio_dataout_reg;
1415 else
1416 bank->set_dataout = omap_set_gpio_dataout_mask;
1417
1418 raw_spin_lock_init(&bank->lock);
1419 raw_spin_lock_init(&bank->wa_lock);
1420
1421 /* Static mapping, never released */
1422 bank->base = devm_platform_ioremap_resource(pdev, 0);
1423 if (IS_ERR(bank->base)) {
1424 return PTR_ERR(bank->base);
1425 }
1426
1427 if (bank->dbck_flag) {
1428 bank->dbck = devm_clk_get(dev, "dbclk");
1429 if (IS_ERR(bank->dbck)) {
1430 dev_err(dev,
1431 "Could not get gpio dbck. Disable debounce\n");
1432 bank->dbck_flag = false;
1433 } else {
1434 clk_prepare(bank->dbck);
1435 }
1436 }
1437
1438 platform_set_drvdata(pdev, bank);
1439
1440 pm_runtime_enable(dev);
1441 pm_runtime_get_sync(dev);
1442
1443 if (bank->is_mpuio)
1444 omap_mpuio_init(bank);
1445
1446 omap_gpio_mod_init(bank);
1447
1448 ret = omap_gpio_chip_init(bank, irqc);
1449 if (ret) {
1450 pm_runtime_put_sync(dev);
1451 pm_runtime_disable(dev);
1452 if (bank->dbck_flag)
1453 clk_unprepare(bank->dbck);
1454 return ret;
1455 }
1456
1457 omap_gpio_show_rev(bank);
1458
1459 bank->nb.notifier_call = gpio_omap_cpu_notifier;
1460 cpu_pm_register_notifier(&bank->nb);
1461
1462 pm_runtime_put(dev);
1463
1464 return 0;
1465 }
1466
1467 static int omap_gpio_remove(struct platform_device *pdev)
1468 {
1469 struct gpio_bank *bank = platform_get_drvdata(pdev);
1470
1471 cpu_pm_unregister_notifier(&bank->nb);
1472 gpiochip_remove(&bank->chip);
1473 pm_runtime_disable(&pdev->dev);
1474 if (bank->dbck_flag)
1475 clk_unprepare(bank->dbck);
1476
1477 return 0;
1478 }
1479
1480 static int __maybe_unused omap_gpio_runtime_suspend(struct device *dev)
1481 {
1482 struct gpio_bank *bank = dev_get_drvdata(dev);
1483 unsigned long flags;
1484
1485 raw_spin_lock_irqsave(&bank->lock, flags);
1486 omap_gpio_idle(bank, true);
1487 bank->is_suspended = true;
1488 raw_spin_unlock_irqrestore(&bank->lock, flags);
1489
1490 return 0;
1491 }
1492
1493 static int __maybe_unused omap_gpio_runtime_resume(struct device *dev)
1494 {
1495 struct gpio_bank *bank = dev_get_drvdata(dev);
1496 unsigned long flags;
1497
1498 raw_spin_lock_irqsave(&bank->lock, flags);
1499 omap_gpio_unidle(bank);
1500 bank->is_suspended = false;
1501 raw_spin_unlock_irqrestore(&bank->lock, flags);
1502
1503 return 0;
1504 }
1505
1506 static const struct dev_pm_ops gpio_pm_ops = {
1507 SET_RUNTIME_PM_OPS(omap_gpio_runtime_suspend, omap_gpio_runtime_resume,
1508 NULL)
1509 };
1510
1511 static struct platform_driver omap_gpio_driver = {
1512 .probe = omap_gpio_probe,
1513 .remove = omap_gpio_remove,
1514 .driver = {
1515 .name = "omap_gpio",
1516 .pm = &gpio_pm_ops,
1517 .of_match_table = omap_gpio_match,
1518 },
1519 };
1520
1521 /*
1522 * gpio driver register needs to be done before
1523 * machine_init functions access gpio APIs.
1524 * Hence omap_gpio_drv_reg() is a postcore_initcall.
1525 */
1526 static int __init omap_gpio_drv_reg(void)
1527 {
1528 return platform_driver_register(&omap_gpio_driver);
1529 }
1530 postcore_initcall(omap_gpio_drv_reg);
1531
1532 static void __exit omap_gpio_exit(void)
1533 {
1534 platform_driver_unregister(&omap_gpio_driver);
1535 }
1536 module_exit(omap_gpio_exit);
1537
1538 MODULE_DESCRIPTION("omap gpio driver");
1539 MODULE_ALIAS("platform:gpio-omap");
1540 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support