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