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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/irqdomain.h>
28#include <linux/irqchip/chained_irq.h>
29#include <linux/gpio.h>
30#include <linux/platform_data/gpio-omap.h>
31
32#define OFF_MODE 1
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 u16 irq;
55 struct irq_domain *domain;
56 u32 non_wakeup_gpios;
57 u32 enabled_non_wakeup_gpios;
58 struct gpio_regs context;
59 u32 saved_datain;
60 u32 level_mask;
61 u32 toggle_mask;
62 spinlock_t 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 struct device *dev;
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 int power_mode;
78 bool workaround_enabled;
79
80 void (*set_dataout)(struct gpio_bank *bank, int gpio, int enable);
81 int (*get_context_loss_count)(struct device *dev);
82
83 struct omap_gpio_reg_offs *regs;
84};
85
86#define GPIO_INDEX(bank, gpio) (gpio % bank->width)
87#define GPIO_BIT(bank, gpio) (1 << GPIO_INDEX(bank, gpio))
88#define GPIO_MOD_CTRL_BIT BIT(0)
89
90#define BANK_USED(bank) (bank->mod_usage || bank->irq_usage)
91#define LINE_USED(line, offset) (line & (1 << offset))
92
93static int irq_to_gpio(struct gpio_bank *bank, unsigned int gpio_irq)
94{
95 return bank->chip.base + gpio_irq;
96}
97
98static int omap_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
99{
100 struct gpio_bank *bank = container_of(chip, struct gpio_bank, chip);
101
102 return irq_find_mapping(bank->domain, offset);
103}
104
105static void _set_gpio_direction(struct gpio_bank *bank, int gpio, int is_input)
106{
107 void __iomem *reg = bank->base;
108 u32 l;
109
110 reg += bank->regs->direction;
111 l = readl_relaxed(reg);
112 if (is_input)
113 l |= 1 << gpio;
114 else
115 l &= ~(1 << gpio);
116 writel_relaxed(l, reg);
117 bank->context.oe = l;
118}
119
120
121/* set data out value using dedicate set/clear register */
122static void _set_gpio_dataout_reg(struct gpio_bank *bank, int gpio, int enable)
123{
124 void __iomem *reg = bank->base;
125 u32 l = GPIO_BIT(bank, gpio);
126
127 if (enable) {
128 reg += bank->regs->set_dataout;
129 bank->context.dataout |= l;
130 } else {
131 reg += bank->regs->clr_dataout;
132 bank->context.dataout &= ~l;
133 }
134
135 writel_relaxed(l, reg);
136}
137
138/* set data out value using mask register */
139static void _set_gpio_dataout_mask(struct gpio_bank *bank, int gpio, int enable)
140{
141 void __iomem *reg = bank->base + bank->regs->dataout;
142 u32 gpio_bit = GPIO_BIT(bank, gpio);
143 u32 l;
144
145 l = readl_relaxed(reg);
146 if (enable)
147 l |= gpio_bit;
148 else
149 l &= ~gpio_bit;
150 writel_relaxed(l, reg);
151 bank->context.dataout = l;
152}
153
154static int _get_gpio_datain(struct gpio_bank *bank, int offset)
155{
156 void __iomem *reg = bank->base + bank->regs->datain;
157
158 return (readl_relaxed(reg) & (1 << offset)) != 0;
159}
160
161static int _get_gpio_dataout(struct gpio_bank *bank, int offset)
162{
163 void __iomem *reg = bank->base + bank->regs->dataout;
164
165 return (readl_relaxed(reg) & (1 << offset)) != 0;
166}
167
168static inline void _gpio_rmw(void __iomem *base, u32 reg, u32 mask, bool set)
169{
170 int l = readl_relaxed(base + reg);
171
172 if (set)
173 l |= mask;
174 else
175 l &= ~mask;
176
177 writel_relaxed(l, base + reg);
178}
179
180static inline void _gpio_dbck_enable(struct gpio_bank *bank)
181{
182 if (bank->dbck_enable_mask && !bank->dbck_enabled) {
183 clk_enable(bank->dbck);
184 bank->dbck_enabled = true;
185
186 writel_relaxed(bank->dbck_enable_mask,
187 bank->base + bank->regs->debounce_en);
188 }
189}
190
191static inline void _gpio_dbck_disable(struct gpio_bank *bank)
192{
193 if (bank->dbck_enable_mask && bank->dbck_enabled) {
194 /*
195 * Disable debounce before cutting it's clock. If debounce is
196 * enabled but the clock is not, GPIO module seems to be unable
197 * to detect events and generate interrupts at least on OMAP3.
198 */
199 writel_relaxed(0, bank->base + bank->regs->debounce_en);
200
201 clk_disable(bank->dbck);
202 bank->dbck_enabled = false;
203 }
204}
205
206/**
207 * _set_gpio_debounce - low level gpio debounce time
208 * @bank: the gpio bank we're acting upon
209 * @gpio: the gpio number on this @gpio
210 * @debounce: debounce time to use
211 *
212 * OMAP's debounce time is in 31us steps so we need
213 * to convert and round up to the closest unit.
214 */
215static void _set_gpio_debounce(struct gpio_bank *bank, unsigned gpio,
216 unsigned debounce)
217{
218 void __iomem *reg;
219 u32 val;
220 u32 l;
221
222 if (!bank->dbck_flag)
223 return;
224
225 if (debounce < 32)
226 debounce = 0x01;
227 else if (debounce > 7936)
228 debounce = 0xff;
229 else
230 debounce = (debounce / 0x1f) - 1;
231
232 l = GPIO_BIT(bank, gpio);
233
234 clk_enable(bank->dbck);
235 reg = bank->base + bank->regs->debounce;
236 writel_relaxed(debounce, reg);
237
238 reg = bank->base + bank->regs->debounce_en;
239 val = readl_relaxed(reg);
240
241 if (debounce)
242 val |= l;
243 else
244 val &= ~l;
245 bank->dbck_enable_mask = val;
246
247 writel_relaxed(val, reg);
248 clk_disable(bank->dbck);
249 /*
250 * Enable debounce clock per module.
251 * This call is mandatory because in omap_gpio_request() when
252 * *_runtime_get_sync() is called, _gpio_dbck_enable() within
253 * runtime callbck fails to turn on dbck because dbck_enable_mask
254 * used within _gpio_dbck_enable() is still not initialized at
255 * that point. Therefore we have to enable dbck here.
256 */
257 _gpio_dbck_enable(bank);
258 if (bank->dbck_enable_mask) {
259 bank->context.debounce = debounce;
260 bank->context.debounce_en = val;
261 }
262}
263
264/**
265 * _clear_gpio_debounce - clear debounce settings for a gpio
266 * @bank: the gpio bank we're acting upon
267 * @gpio: the gpio number on this @gpio
268 *
269 * If a gpio is using debounce, then clear the debounce enable bit and if
270 * this is the only gpio in this bank using debounce, then clear the debounce
271 * time too. The debounce clock will also be disabled when calling this function
272 * if this is the only gpio in the bank using debounce.
273 */
274static void _clear_gpio_debounce(struct gpio_bank *bank, unsigned gpio)
275{
276 u32 gpio_bit = GPIO_BIT(bank, gpio);
277
278 if (!bank->dbck_flag)
279 return;
280
281 if (!(bank->dbck_enable_mask & gpio_bit))
282 return;
283
284 bank->dbck_enable_mask &= ~gpio_bit;
285 bank->context.debounce_en &= ~gpio_bit;
286 writel_relaxed(bank->context.debounce_en,
287 bank->base + bank->regs->debounce_en);
288
289 if (!bank->dbck_enable_mask) {
290 bank->context.debounce = 0;
291 writel_relaxed(bank->context.debounce, bank->base +
292 bank->regs->debounce);
293 clk_disable(bank->dbck);
294 bank->dbck_enabled = false;
295 }
296}
297
298static inline void set_gpio_trigger(struct gpio_bank *bank, int gpio,
299 unsigned trigger)
300{
301 void __iomem *base = bank->base;
302 u32 gpio_bit = 1 << gpio;
303
304 _gpio_rmw(base, bank->regs->leveldetect0, gpio_bit,
305 trigger & IRQ_TYPE_LEVEL_LOW);
306 _gpio_rmw(base, bank->regs->leveldetect1, gpio_bit,
307 trigger & IRQ_TYPE_LEVEL_HIGH);
308 _gpio_rmw(base, bank->regs->risingdetect, gpio_bit,
309 trigger & IRQ_TYPE_EDGE_RISING);
310 _gpio_rmw(base, bank->regs->fallingdetect, gpio_bit,
311 trigger & IRQ_TYPE_EDGE_FALLING);
312
313 bank->context.leveldetect0 =
314 readl_relaxed(bank->base + bank->regs->leveldetect0);
315 bank->context.leveldetect1 =
316 readl_relaxed(bank->base + bank->regs->leveldetect1);
317 bank->context.risingdetect =
318 readl_relaxed(bank->base + bank->regs->risingdetect);
319 bank->context.fallingdetect =
320 readl_relaxed(bank->base + bank->regs->fallingdetect);
321
322 if (likely(!(bank->non_wakeup_gpios & gpio_bit))) {
323 _gpio_rmw(base, bank->regs->wkup_en, gpio_bit, trigger != 0);
324 bank->context.wake_en =
325 readl_relaxed(bank->base + bank->regs->wkup_en);
326 }
327
328 /* This part needs to be executed always for OMAP{34xx, 44xx} */
329 if (!bank->regs->irqctrl) {
330 /* On omap24xx proceed only when valid GPIO bit is set */
331 if (bank->non_wakeup_gpios) {
332 if (!(bank->non_wakeup_gpios & gpio_bit))
333 goto exit;
334 }
335
336 /*
337 * Log the edge gpio and manually trigger the IRQ
338 * after resume if the input level changes
339 * to avoid irq lost during PER RET/OFF mode
340 * Applies for omap2 non-wakeup gpio and all omap3 gpios
341 */
342 if (trigger & IRQ_TYPE_EDGE_BOTH)
343 bank->enabled_non_wakeup_gpios |= gpio_bit;
344 else
345 bank->enabled_non_wakeup_gpios &= ~gpio_bit;
346 }
347
348exit:
349 bank->level_mask =
350 readl_relaxed(bank->base + bank->regs->leveldetect0) |
351 readl_relaxed(bank->base + bank->regs->leveldetect1);
352}
353
354#ifdef CONFIG_ARCH_OMAP1
355/*
356 * This only applies to chips that can't do both rising and falling edge
357 * detection at once. For all other chips, this function is a noop.
358 */
359static void _toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio)
360{
361 void __iomem *reg = bank->base;
362 u32 l = 0;
363
364 if (!bank->regs->irqctrl)
365 return;
366
367 reg += bank->regs->irqctrl;
368
369 l = readl_relaxed(reg);
370 if ((l >> gpio) & 1)
371 l &= ~(1 << gpio);
372 else
373 l |= 1 << gpio;
374
375 writel_relaxed(l, reg);
376}
377#else
378static void _toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio) {}
379#endif
380
381static int _set_gpio_triggering(struct gpio_bank *bank, int gpio,
382 unsigned trigger)
383{
384 void __iomem *reg = bank->base;
385 void __iomem *base = bank->base;
386 u32 l = 0;
387
388 if (bank->regs->leveldetect0 && bank->regs->wkup_en) {
389 set_gpio_trigger(bank, gpio, trigger);
390 } else if (bank->regs->irqctrl) {
391 reg += bank->regs->irqctrl;
392
393 l = readl_relaxed(reg);
394 if ((trigger & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH)
395 bank->toggle_mask |= 1 << gpio;
396 if (trigger & IRQ_TYPE_EDGE_RISING)
397 l |= 1 << gpio;
398 else if (trigger & IRQ_TYPE_EDGE_FALLING)
399 l &= ~(1 << gpio);
400 else
401 return -EINVAL;
402
403 writel_relaxed(l, reg);
404 } else if (bank->regs->edgectrl1) {
405 if (gpio & 0x08)
406 reg += bank->regs->edgectrl2;
407 else
408 reg += bank->regs->edgectrl1;
409
410 gpio &= 0x07;
411 l = readl_relaxed(reg);
412 l &= ~(3 << (gpio << 1));
413 if (trigger & IRQ_TYPE_EDGE_RISING)
414 l |= 2 << (gpio << 1);
415 if (trigger & IRQ_TYPE_EDGE_FALLING)
416 l |= 1 << (gpio << 1);
417
418 /* Enable wake-up during idle for dynamic tick */
419 _gpio_rmw(base, bank->regs->wkup_en, 1 << gpio, trigger);
420 bank->context.wake_en =
421 readl_relaxed(bank->base + bank->regs->wkup_en);
422 writel_relaxed(l, reg);
423 }
424 return 0;
425}
426
427static void _enable_gpio_module(struct gpio_bank *bank, unsigned offset)
428{
429 if (bank->regs->pinctrl) {
430 void __iomem *reg = bank->base + bank->regs->pinctrl;
431
432 /* Claim the pin for MPU */
433 writel_relaxed(readl_relaxed(reg) | (1 << offset), reg);
434 }
435
436 if (bank->regs->ctrl && !BANK_USED(bank)) {
437 void __iomem *reg = bank->base + bank->regs->ctrl;
438 u32 ctrl;
439
440 ctrl = readl_relaxed(reg);
441 /* Module is enabled, clocks are not gated */
442 ctrl &= ~GPIO_MOD_CTRL_BIT;
443 writel_relaxed(ctrl, reg);
444 bank->context.ctrl = ctrl;
445 }
446}
447
448static void _disable_gpio_module(struct gpio_bank *bank, unsigned offset)
449{
450 void __iomem *base = bank->base;
451
452 if (bank->regs->wkup_en &&
453 !LINE_USED(bank->mod_usage, offset) &&
454 !LINE_USED(bank->irq_usage, offset)) {
455 /* Disable wake-up during idle for dynamic tick */
456 _gpio_rmw(base, bank->regs->wkup_en, 1 << offset, 0);
457 bank->context.wake_en =
458 readl_relaxed(bank->base + bank->regs->wkup_en);
459 }
460
461 if (bank->regs->ctrl && !BANK_USED(bank)) {
462 void __iomem *reg = bank->base + bank->regs->ctrl;
463 u32 ctrl;
464
465 ctrl = readl_relaxed(reg);
466 /* Module is disabled, clocks are gated */
467 ctrl |= GPIO_MOD_CTRL_BIT;
468 writel_relaxed(ctrl, reg);
469 bank->context.ctrl = ctrl;
470 }
471}
472
473static int gpio_is_input(struct gpio_bank *bank, int mask)
474{
475 void __iomem *reg = bank->base + bank->regs->direction;
476
477 return readl_relaxed(reg) & mask;
478}
479
480static int gpio_irq_type(struct irq_data *d, unsigned type)
481{
482 struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
483 unsigned gpio = 0;
484 int retval;
485 unsigned long flags;
486 unsigned offset;
487
488 if (!BANK_USED(bank))
489 pm_runtime_get_sync(bank->dev);
490
491#ifdef CONFIG_ARCH_OMAP1
492 if (d->irq > IH_MPUIO_BASE)
493 gpio = OMAP_MPUIO(d->irq - IH_MPUIO_BASE);
494#endif
495
496 if (!gpio)
497 gpio = irq_to_gpio(bank, d->hwirq);
498
499 if (type & ~IRQ_TYPE_SENSE_MASK)
500 return -EINVAL;
501
502 if (!bank->regs->leveldetect0 &&
503 (type & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH)))
504 return -EINVAL;
505
506 spin_lock_irqsave(&bank->lock, flags);
507 offset = GPIO_INDEX(bank, gpio);
508 retval = _set_gpio_triggering(bank, offset, type);
509 if (!LINE_USED(bank->mod_usage, offset)) {
510 _enable_gpio_module(bank, offset);
511 _set_gpio_direction(bank, offset, 1);
512 } else if (!gpio_is_input(bank, 1 << offset)) {
513 spin_unlock_irqrestore(&bank->lock, flags);
514 return -EINVAL;
515 }
516
517 retval = gpio_lock_as_irq(&bank->chip, offset);
518 if (retval) {
519 dev_err(bank->dev, "unable to lock offset %d for IRQ\n",
520 offset);
521 spin_unlock_irqrestore(&bank->lock, flags);
522 return retval;
523 }
524
525 bank->irq_usage |= 1 << GPIO_INDEX(bank, gpio);
526 spin_unlock_irqrestore(&bank->lock, flags);
527
528 if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
529 __irq_set_handler_locked(d->irq, handle_level_irq);
530 else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
531 __irq_set_handler_locked(d->irq, handle_edge_irq);
532
533 return retval;
534}
535
536static void _clear_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
537{
538 void __iomem *reg = bank->base;
539
540 reg += bank->regs->irqstatus;
541 writel_relaxed(gpio_mask, reg);
542
543 /* Workaround for clearing DSP GPIO interrupts to allow retention */
544 if (bank->regs->irqstatus2) {
545 reg = bank->base + bank->regs->irqstatus2;
546 writel_relaxed(gpio_mask, reg);
547 }
548
549 /* Flush posted write for the irq status to avoid spurious interrupts */
550 readl_relaxed(reg);
551}
552
553static inline void _clear_gpio_irqstatus(struct gpio_bank *bank, int gpio)
554{
555 _clear_gpio_irqbank(bank, GPIO_BIT(bank, gpio));
556}
557
558static u32 _get_gpio_irqbank_mask(struct gpio_bank *bank)
559{
560 void __iomem *reg = bank->base;
561 u32 l;
562 u32 mask = (1 << 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 _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 _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 _set_gpio_irqenable(struct gpio_bank *bank, int gpio, int enable)
617{
618 if (enable)
619 _enable_gpio_irqbank(bank, GPIO_BIT(bank, gpio));
620 else
621 _disable_gpio_irqbank(bank, GPIO_BIT(bank, gpio));
622}
623
624/*
625 * Note that ENAWAKEUP needs to be enabled in GPIO_SYSCONFIG register.
626 * 1510 does not seem to have a wake-up register. If JTAG is connected
627 * to the target, system will wake up always on GPIO events. While
628 * system is running all registered GPIO interrupts need to have wake-up
629 * enabled. When system is suspended, only selected GPIO interrupts need
630 * to have wake-up enabled.
631 */
632static int _set_gpio_wakeup(struct gpio_bank *bank, int gpio, int enable)
633{
634 u32 gpio_bit = GPIO_BIT(bank, gpio);
635 unsigned long flags;
636
637 if (bank->non_wakeup_gpios & gpio_bit) {
638 dev_err(bank->dev,
639 "Unable to modify wakeup on non-wakeup GPIO%d\n", gpio);
640 return -EINVAL;
641 }
642
643 spin_lock_irqsave(&bank->lock, flags);
644 if (enable)
645 bank->context.wake_en |= gpio_bit;
646 else
647 bank->context.wake_en &= ~gpio_bit;
648
649 writel_relaxed(bank->context.wake_en, bank->base + bank->regs->wkup_en);
650 spin_unlock_irqrestore(&bank->lock, flags);
651
652 return 0;
653}
654
655static void _reset_gpio(struct gpio_bank *bank, int gpio)
656{
657 _set_gpio_direction(bank, GPIO_INDEX(bank, gpio), 1);
658 _set_gpio_irqenable(bank, gpio, 0);
659 _clear_gpio_irqstatus(bank, gpio);
660 _set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), IRQ_TYPE_NONE);
661 _clear_gpio_debounce(bank, gpio);
662}
663
664/* Use disable_irq_wake() and enable_irq_wake() functions from drivers */
665static int gpio_wake_enable(struct irq_data *d, unsigned int enable)
666{
667 struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
668 unsigned int gpio = irq_to_gpio(bank, d->hwirq);
669
670 return _set_gpio_wakeup(bank, gpio, enable);
671}
672
673static int omap_gpio_request(struct gpio_chip *chip, unsigned offset)
674{
675 struct gpio_bank *bank = container_of(chip, struct gpio_bank, chip);
676 unsigned long flags;
677
678 /*
679 * If this is the first gpio_request for the bank,
680 * enable the bank module.
681 */
682 if (!BANK_USED(bank))
683 pm_runtime_get_sync(bank->dev);
684
685 spin_lock_irqsave(&bank->lock, flags);
686 /* Set trigger to none. You need to enable the desired trigger with
687 * request_irq() or set_irq_type(). Only do this if the IRQ line has
688 * not already been requested.
689 */
690 if (!LINE_USED(bank->irq_usage, offset)) {
691 _set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);
692 _enable_gpio_module(bank, offset);
693 }
694 bank->mod_usage |= 1 << offset;
695 spin_unlock_irqrestore(&bank->lock, flags);
696
697 return 0;
698}
699
700static void omap_gpio_free(struct gpio_chip *chip, unsigned offset)
701{
702 struct gpio_bank *bank = container_of(chip, struct gpio_bank, chip);
703 unsigned long flags;
704
705 spin_lock_irqsave(&bank->lock, flags);
706 bank->mod_usage &= ~(1 << offset);
707 _disable_gpio_module(bank, offset);
708 _reset_gpio(bank, bank->chip.base + offset);
709 spin_unlock_irqrestore(&bank->lock, flags);
710
711 /*
712 * If this is the last gpio to be freed in the bank,
713 * disable the bank module.
714 */
715 if (!BANK_USED(bank))
716 pm_runtime_put(bank->dev);
717}
718
719/*
720 * We need to unmask the GPIO bank interrupt as soon as possible to
721 * avoid missing GPIO interrupts for other lines in the bank.
722 * Then we need to mask-read-clear-unmask the triggered GPIO lines
723 * in the bank to avoid missing nested interrupts for a GPIO line.
724 * If we wait to unmask individual GPIO lines in the bank after the
725 * line's interrupt handler has been run, we may miss some nested
726 * interrupts.
727 */
728static void gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
729{
730 void __iomem *isr_reg = NULL;
731 u32 isr;
732 unsigned int bit;
733 struct gpio_bank *bank;
734 int unmasked = 0;
735 struct irq_chip *chip = irq_desc_get_chip(desc);
736
737 chained_irq_enter(chip, desc);
738
739 bank = irq_get_handler_data(irq);
740 isr_reg = bank->base + bank->regs->irqstatus;
741 pm_runtime_get_sync(bank->dev);
742
743 if (WARN_ON(!isr_reg))
744 goto exit;
745
746 while (1) {
747 u32 isr_saved, level_mask = 0;
748 u32 enabled;
749
750 enabled = _get_gpio_irqbank_mask(bank);
751 isr_saved = isr = readl_relaxed(isr_reg) & enabled;
752
753 if (bank->level_mask)
754 level_mask = bank->level_mask & enabled;
755
756 /* clear edge sensitive interrupts before handler(s) are
757 called so that we don't miss any interrupt occurred while
758 executing them */
759 _disable_gpio_irqbank(bank, isr_saved & ~level_mask);
760 _clear_gpio_irqbank(bank, isr_saved & ~level_mask);
761 _enable_gpio_irqbank(bank, isr_saved & ~level_mask);
762
763 /* if there is only edge sensitive GPIO pin interrupts
764 configured, we could unmask GPIO bank interrupt immediately */
765 if (!level_mask && !unmasked) {
766 unmasked = 1;
767 chained_irq_exit(chip, desc);
768 }
769
770 if (!isr)
771 break;
772
773 while (isr) {
774 bit = __ffs(isr);
775 isr &= ~(1 << bit);
776
777 /*
778 * Some chips can't respond to both rising and falling
779 * at the same time. If this irq was requested with
780 * both flags, we need to flip the ICR data for the IRQ
781 * to respond to the IRQ for the opposite direction.
782 * This will be indicated in the bank toggle_mask.
783 */
784 if (bank->toggle_mask & (1 << bit))
785 _toggle_gpio_edge_triggering(bank, bit);
786
787 generic_handle_irq(irq_find_mapping(bank->domain, bit));
788 }
789 }
790 /* if bank has any level sensitive GPIO pin interrupt
791 configured, we must unmask the bank interrupt only after
792 handler(s) are executed in order to avoid spurious bank
793 interrupt */
794exit:
795 if (!unmasked)
796 chained_irq_exit(chip, desc);
797 pm_runtime_put(bank->dev);
798}
799
800static void gpio_irq_shutdown(struct irq_data *d)
801{
802 struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
803 unsigned int gpio = irq_to_gpio(bank, d->hwirq);
804 unsigned long flags;
805 unsigned offset = GPIO_INDEX(bank, gpio);
806
807 spin_lock_irqsave(&bank->lock, flags);
808 gpio_unlock_as_irq(&bank->chip, offset);
809 bank->irq_usage &= ~(1 << offset);
810 _disable_gpio_module(bank, offset);
811 _reset_gpio(bank, gpio);
812 spin_unlock_irqrestore(&bank->lock, flags);
813
814 /*
815 * If this is the last IRQ to be freed in the bank,
816 * disable the bank module.
817 */
818 if (!BANK_USED(bank))
819 pm_runtime_put(bank->dev);
820}
821
822static void gpio_ack_irq(struct irq_data *d)
823{
824 struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
825 unsigned int gpio = irq_to_gpio(bank, d->hwirq);
826
827 _clear_gpio_irqstatus(bank, gpio);
828}
829
830static void gpio_mask_irq(struct irq_data *d)
831{
832 struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
833 unsigned int gpio = irq_to_gpio(bank, d->hwirq);
834 unsigned long flags;
835
836 spin_lock_irqsave(&bank->lock, flags);
837 _set_gpio_irqenable(bank, gpio, 0);
838 _set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), IRQ_TYPE_NONE);
839 spin_unlock_irqrestore(&bank->lock, flags);
840}
841
842static void gpio_unmask_irq(struct irq_data *d)
843{
844 struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
845 unsigned int gpio = irq_to_gpio(bank, d->hwirq);
846 unsigned int irq_mask = GPIO_BIT(bank, gpio);
847 u32 trigger = irqd_get_trigger_type(d);
848 unsigned long flags;
849
850 spin_lock_irqsave(&bank->lock, flags);
851 if (trigger)
852 _set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), trigger);
853
854 /* For level-triggered GPIOs, the clearing must be done after
855 * the HW source is cleared, thus after the handler has run */
856 if (bank->level_mask & irq_mask) {
857 _set_gpio_irqenable(bank, gpio, 0);
858 _clear_gpio_irqstatus(bank, gpio);
859 }
860
861 _set_gpio_irqenable(bank, gpio, 1);
862 spin_unlock_irqrestore(&bank->lock, flags);
863}
864
865static struct irq_chip gpio_irq_chip = {
866 .name = "GPIO",
867 .irq_shutdown = gpio_irq_shutdown,
868 .irq_ack = gpio_ack_irq,
869 .irq_mask = gpio_mask_irq,
870 .irq_unmask = gpio_unmask_irq,
871 .irq_set_type = gpio_irq_type,
872 .irq_set_wake = gpio_wake_enable,
873};
874
875/*---------------------------------------------------------------------*/
876
877static int omap_mpuio_suspend_noirq(struct device *dev)
878{
879 struct platform_device *pdev = to_platform_device(dev);
880 struct gpio_bank *bank = platform_get_drvdata(pdev);
881 void __iomem *mask_reg = bank->base +
882 OMAP_MPUIO_GPIO_MASKIT / bank->stride;
883 unsigned long flags;
884
885 spin_lock_irqsave(&bank->lock, flags);
886 writel_relaxed(0xffff & ~bank->context.wake_en, mask_reg);
887 spin_unlock_irqrestore(&bank->lock, flags);
888
889 return 0;
890}
891
892static int omap_mpuio_resume_noirq(struct device *dev)
893{
894 struct platform_device *pdev = to_platform_device(dev);
895 struct gpio_bank *bank = platform_get_drvdata(pdev);
896 void __iomem *mask_reg = bank->base +
897 OMAP_MPUIO_GPIO_MASKIT / bank->stride;
898 unsigned long flags;
899
900 spin_lock_irqsave(&bank->lock, flags);
901 writel_relaxed(bank->context.wake_en, mask_reg);
902 spin_unlock_irqrestore(&bank->lock, flags);
903
904 return 0;
905}
906
907static const struct dev_pm_ops omap_mpuio_dev_pm_ops = {
908 .suspend_noirq = omap_mpuio_suspend_noirq,
909 .resume_noirq = omap_mpuio_resume_noirq,
910};
911
912/* use platform_driver for this. */
913static struct platform_driver omap_mpuio_driver = {
914 .driver = {
915 .name = "mpuio",
916 .pm = &omap_mpuio_dev_pm_ops,
917 },
918};
919
920static struct platform_device omap_mpuio_device = {
921 .name = "mpuio",
922 .id = -1,
923 .dev = {
924 .driver = &omap_mpuio_driver.driver,
925 }
926 /* could list the /proc/iomem resources */
927};
928
929static inline void mpuio_init(struct gpio_bank *bank)
930{
931 platform_set_drvdata(&omap_mpuio_device, bank);
932
933 if (platform_driver_register(&omap_mpuio_driver) == 0)
934 (void) platform_device_register(&omap_mpuio_device);
935}
936
937/*---------------------------------------------------------------------*/
938
939static int gpio_input(struct gpio_chip *chip, unsigned offset)
940{
941 struct gpio_bank *bank;
942 unsigned long flags;
943
944 bank = container_of(chip, struct gpio_bank, chip);
945 spin_lock_irqsave(&bank->lock, flags);
946 _set_gpio_direction(bank, offset, 1);
947 spin_unlock_irqrestore(&bank->lock, flags);
948 return 0;
949}
950
951static int gpio_get(struct gpio_chip *chip, unsigned offset)
952{
953 struct gpio_bank *bank;
954 u32 mask;
955
956 bank = container_of(chip, struct gpio_bank, chip);
957 mask = (1 << offset);
958
959 if (gpio_is_input(bank, mask))
960 return _get_gpio_datain(bank, offset);
961 else
962 return _get_gpio_dataout(bank, offset);
963}
964
965static int gpio_output(struct gpio_chip *chip, unsigned offset, int value)
966{
967 struct gpio_bank *bank;
968 unsigned long flags;
969
970 bank = container_of(chip, struct gpio_bank, chip);
971 spin_lock_irqsave(&bank->lock, flags);
972 bank->set_dataout(bank, offset, value);
973 _set_gpio_direction(bank, offset, 0);
974 spin_unlock_irqrestore(&bank->lock, flags);
975 return 0;
976}
977
978static int gpio_debounce(struct gpio_chip *chip, unsigned offset,
979 unsigned debounce)
980{
981 struct gpio_bank *bank;
982 unsigned long flags;
983
984 bank = container_of(chip, struct gpio_bank, chip);
985
986 spin_lock_irqsave(&bank->lock, flags);
987 _set_gpio_debounce(bank, offset, debounce);
988 spin_unlock_irqrestore(&bank->lock, flags);
989
990 return 0;
991}
992
993static void gpio_set(struct gpio_chip *chip, unsigned offset, int value)
994{
995 struct gpio_bank *bank;
996 unsigned long flags;
997
998 bank = container_of(chip, struct gpio_bank, chip);
999 spin_lock_irqsave(&bank->lock, flags);
1000 bank->set_dataout(bank, offset, value);
1001 spin_unlock_irqrestore(&bank->lock, flags);
1002}
1003
1004/*---------------------------------------------------------------------*/
1005
1006static void __init omap_gpio_show_rev(struct gpio_bank *bank)
1007{
1008 static bool called;
1009 u32 rev;
1010
1011 if (called || bank->regs->revision == USHRT_MAX)
1012 return;
1013
1014 rev = readw_relaxed(bank->base + bank->regs->revision);
1015 pr_info("OMAP GPIO hardware version %d.%d\n",
1016 (rev >> 4) & 0x0f, rev & 0x0f);
1017
1018 called = true;
1019}
1020
1021/* This lock class tells lockdep that GPIO irqs are in a different
1022 * category than their parents, so it won't report false recursion.
1023 */
1024static struct lock_class_key gpio_lock_class;
1025
1026static void omap_gpio_mod_init(struct gpio_bank *bank)
1027{
1028 void __iomem *base = bank->base;
1029 u32 l = 0xffffffff;
1030
1031 if (bank->width == 16)
1032 l = 0xffff;
1033
1034 if (bank->is_mpuio) {
1035 writel_relaxed(l, bank->base + bank->regs->irqenable);
1036 return;
1037 }
1038
1039 _gpio_rmw(base, bank->regs->irqenable, l, bank->regs->irqenable_inv);
1040 _gpio_rmw(base, bank->regs->irqstatus, l, !bank->regs->irqenable_inv);
1041 if (bank->regs->debounce_en)
1042 writel_relaxed(0, base + bank->regs->debounce_en);
1043
1044 /* Save OE default value (0xffffffff) in the context */
1045 bank->context.oe = readl_relaxed(bank->base + bank->regs->direction);
1046 /* Initialize interface clk ungated, module enabled */
1047 if (bank->regs->ctrl)
1048 writel_relaxed(0, base + bank->regs->ctrl);
1049
1050 bank->dbck = clk_get(bank->dev, "dbclk");
1051 if (IS_ERR(bank->dbck))
1052 dev_err(bank->dev, "Could not get gpio dbck\n");
1053}
1054
1055static void
1056omap_mpuio_alloc_gc(struct gpio_bank *bank, unsigned int irq_start,
1057 unsigned int num)
1058{
1059 struct irq_chip_generic *gc;
1060 struct irq_chip_type *ct;
1061
1062 gc = irq_alloc_generic_chip("MPUIO", 1, irq_start, bank->base,
1063 handle_simple_irq);
1064 if (!gc) {
1065 dev_err(bank->dev, "Memory alloc failed for gc\n");
1066 return;
1067 }
1068
1069 ct = gc->chip_types;
1070
1071 /* NOTE: No ack required, reading IRQ status clears it. */
1072 ct->chip.irq_mask = irq_gc_mask_set_bit;
1073 ct->chip.irq_unmask = irq_gc_mask_clr_bit;
1074 ct->chip.irq_set_type = gpio_irq_type;
1075
1076 if (bank->regs->wkup_en)
1077 ct->chip.irq_set_wake = gpio_wake_enable;
1078
1079 ct->regs.mask = OMAP_MPUIO_GPIO_INT / bank->stride;
1080 irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE,
1081 IRQ_NOREQUEST | IRQ_NOPROBE, 0);
1082}
1083
1084static void omap_gpio_chip_init(struct gpio_bank *bank)
1085{
1086 int j;
1087 static int gpio;
1088
1089 /*
1090 * REVISIT eventually switch from OMAP-specific gpio structs
1091 * over to the generic ones
1092 */
1093 bank->chip.request = omap_gpio_request;
1094 bank->chip.free = omap_gpio_free;
1095 bank->chip.direction_input = gpio_input;
1096 bank->chip.get = gpio_get;
1097 bank->chip.direction_output = gpio_output;
1098 bank->chip.set_debounce = gpio_debounce;
1099 bank->chip.set = gpio_set;
1100 bank->chip.to_irq = omap_gpio_to_irq;
1101 if (bank->is_mpuio) {
1102 bank->chip.label = "mpuio";
1103 if (bank->regs->wkup_en)
1104 bank->chip.dev = &omap_mpuio_device.dev;
1105 bank->chip.base = OMAP_MPUIO(0);
1106 } else {
1107 bank->chip.label = "gpio";
1108 bank->chip.base = gpio;
1109 gpio += bank->width;
1110 }
1111 bank->chip.ngpio = bank->width;
1112
1113 gpiochip_add(&bank->chip);
1114
1115 for (j = 0; j < bank->width; j++) {
1116 int irq = irq_create_mapping(bank->domain, j);
1117 irq_set_lockdep_class(irq, &gpio_lock_class);
1118 irq_set_chip_data(irq, bank);
1119 if (bank->is_mpuio) {
1120 omap_mpuio_alloc_gc(bank, irq, bank->width);
1121 } else {
1122 irq_set_chip_and_handler(irq, &gpio_irq_chip,
1123 handle_simple_irq);
1124 set_irq_flags(irq, IRQF_VALID);
1125 }
1126 }
1127 irq_set_chained_handler(bank->irq, gpio_irq_handler);
1128 irq_set_handler_data(bank->irq, bank);
1129}
1130
1131static const struct of_device_id omap_gpio_match[];
1132
1133static int omap_gpio_probe(struct platform_device *pdev)
1134{
1135 struct device *dev = &pdev->dev;
1136 struct device_node *node = dev->of_node;
1137 const struct of_device_id *match;
1138 const struct omap_gpio_platform_data *pdata;
1139 struct resource *res;
1140 struct gpio_bank *bank;
1141#ifdef CONFIG_ARCH_OMAP1
1142 int irq_base;
1143#endif
1144
1145 match = of_match_device(of_match_ptr(omap_gpio_match), dev);
1146
1147 pdata = match ? match->data : dev_get_platdata(dev);
1148 if (!pdata)
1149 return -EINVAL;
1150
1151 bank = devm_kzalloc(dev, sizeof(struct gpio_bank), GFP_KERNEL);
1152 if (!bank) {
1153 dev_err(dev, "Memory alloc failed\n");
1154 return -ENOMEM;
1155 }
1156
1157 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1158 if (unlikely(!res)) {
1159 dev_err(dev, "Invalid IRQ resource\n");
1160 return -ENODEV;
1161 }
1162
1163 bank->irq = res->start;
1164 bank->dev = dev;
1165 bank->dbck_flag = pdata->dbck_flag;
1166 bank->stride = pdata->bank_stride;
1167 bank->width = pdata->bank_width;
1168 bank->is_mpuio = pdata->is_mpuio;
1169 bank->non_wakeup_gpios = pdata->non_wakeup_gpios;
1170 bank->regs = pdata->regs;
1171#ifdef CONFIG_OF_GPIO
1172 bank->chip.of_node = of_node_get(node);
1173#endif
1174 if (node) {
1175 if (!of_property_read_bool(node, "ti,gpio-always-on"))
1176 bank->loses_context = true;
1177 } else {
1178 bank->loses_context = pdata->loses_context;
1179
1180 if (bank->loses_context)
1181 bank->get_context_loss_count =
1182 pdata->get_context_loss_count;
1183 }
1184
1185#ifdef CONFIG_ARCH_OMAP1
1186 /*
1187 * REVISIT: Once we have OMAP1 supporting SPARSE_IRQ, we can drop
1188 * irq_alloc_descs() and irq_domain_add_legacy() and just use a
1189 * linear IRQ domain mapping for all OMAP platforms.
1190 */
1191 irq_base = irq_alloc_descs(-1, 0, bank->width, 0);
1192 if (irq_base < 0) {
1193 dev_err(dev, "Couldn't allocate IRQ numbers\n");
1194 return -ENODEV;
1195 }
1196
1197 bank->domain = irq_domain_add_legacy(node, bank->width, irq_base,
1198 0, &irq_domain_simple_ops, NULL);
1199#else
1200 bank->domain = irq_domain_add_linear(node, bank->width,
1201 &irq_domain_simple_ops, NULL);
1202#endif
1203 if (!bank->domain) {
1204 dev_err(dev, "Couldn't register an IRQ domain\n");
1205 return -ENODEV;
1206 }
1207
1208 if (bank->regs->set_dataout && bank->regs->clr_dataout)
1209 bank->set_dataout = _set_gpio_dataout_reg;
1210 else
1211 bank->set_dataout = _set_gpio_dataout_mask;
1212
1213 spin_lock_init(&bank->lock);
1214
1215 /* Static mapping, never released */
1216 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1217 bank->base = devm_ioremap_resource(dev, res);
1218 if (IS_ERR(bank->base)) {
1219 irq_domain_remove(bank->domain);
1220 return PTR_ERR(bank->base);
1221 }
1222
1223 platform_set_drvdata(pdev, bank);
1224
1225 pm_runtime_enable(bank->dev);
1226 pm_runtime_irq_safe(bank->dev);
1227 pm_runtime_get_sync(bank->dev);
1228
1229 if (bank->is_mpuio)
1230 mpuio_init(bank);
1231
1232 omap_gpio_mod_init(bank);
1233 omap_gpio_chip_init(bank);
1234 omap_gpio_show_rev(bank);
1235
1236 pm_runtime_put(bank->dev);
1237
1238 list_add_tail(&bank->node, &omap_gpio_list);
1239
1240 return 0;
1241}
1242
1243#ifdef CONFIG_ARCH_OMAP2PLUS
1244
1245#if defined(CONFIG_PM_RUNTIME)
1246static void omap_gpio_restore_context(struct gpio_bank *bank);
1247
1248static int omap_gpio_runtime_suspend(struct device *dev)
1249{
1250 struct platform_device *pdev = to_platform_device(dev);
1251 struct gpio_bank *bank = platform_get_drvdata(pdev);
1252 u32 l1 = 0, l2 = 0;
1253 unsigned long flags;
1254 u32 wake_low, wake_hi;
1255
1256 spin_lock_irqsave(&bank->lock, flags);
1257
1258 /*
1259 * Only edges can generate a wakeup event to the PRCM.
1260 *
1261 * Therefore, ensure any wake-up capable GPIOs have
1262 * edge-detection enabled before going idle to ensure a wakeup
1263 * to the PRCM is generated on a GPIO transition. (c.f. 34xx
1264 * NDA TRM 25.5.3.1)
1265 *
1266 * The normal values will be restored upon ->runtime_resume()
1267 * by writing back the values saved in bank->context.
1268 */
1269 wake_low = bank->context.leveldetect0 & bank->context.wake_en;
1270 if (wake_low)
1271 writel_relaxed(wake_low | bank->context.fallingdetect,
1272 bank->base + bank->regs->fallingdetect);
1273 wake_hi = bank->context.leveldetect1 & bank->context.wake_en;
1274 if (wake_hi)
1275 writel_relaxed(wake_hi | bank->context.risingdetect,
1276 bank->base + bank->regs->risingdetect);
1277
1278 if (!bank->enabled_non_wakeup_gpios)
1279 goto update_gpio_context_count;
1280
1281 if (bank->power_mode != OFF_MODE) {
1282 bank->power_mode = 0;
1283 goto update_gpio_context_count;
1284 }
1285 /*
1286 * If going to OFF, remove triggering for all
1287 * non-wakeup GPIOs. Otherwise spurious IRQs will be
1288 * generated. See OMAP2420 Errata item 1.101.
1289 */
1290 bank->saved_datain = readl_relaxed(bank->base +
1291 bank->regs->datain);
1292 l1 = bank->context.fallingdetect;
1293 l2 = bank->context.risingdetect;
1294
1295 l1 &= ~bank->enabled_non_wakeup_gpios;
1296 l2 &= ~bank->enabled_non_wakeup_gpios;
1297
1298 writel_relaxed(l1, bank->base + bank->regs->fallingdetect);
1299 writel_relaxed(l2, bank->base + bank->regs->risingdetect);
1300
1301 bank->workaround_enabled = true;
1302
1303update_gpio_context_count:
1304 if (bank->get_context_loss_count)
1305 bank->context_loss_count =
1306 bank->get_context_loss_count(bank->dev);
1307
1308 _gpio_dbck_disable(bank);
1309 spin_unlock_irqrestore(&bank->lock, flags);
1310
1311 return 0;
1312}
1313
1314static void omap_gpio_init_context(struct gpio_bank *p);
1315
1316static int omap_gpio_runtime_resume(struct device *dev)
1317{
1318 struct platform_device *pdev = to_platform_device(dev);
1319 struct gpio_bank *bank = platform_get_drvdata(pdev);
1320 u32 l = 0, gen, gen0, gen1;
1321 unsigned long flags;
1322 int c;
1323
1324 spin_lock_irqsave(&bank->lock, flags);
1325
1326 /*
1327 * On the first resume during the probe, the context has not
1328 * been initialised and so initialise it now. Also initialise
1329 * the context loss count.
1330 */
1331 if (bank->loses_context && !bank->context_valid) {
1332 omap_gpio_init_context(bank);
1333
1334 if (bank->get_context_loss_count)
1335 bank->context_loss_count =
1336 bank->get_context_loss_count(bank->dev);
1337 }
1338
1339 _gpio_dbck_enable(bank);
1340
1341 /*
1342 * In ->runtime_suspend(), level-triggered, wakeup-enabled
1343 * GPIOs were set to edge trigger also in order to be able to
1344 * generate a PRCM wakeup. Here we restore the
1345 * pre-runtime_suspend() values for edge triggering.
1346 */
1347 writel_relaxed(bank->context.fallingdetect,
1348 bank->base + bank->regs->fallingdetect);
1349 writel_relaxed(bank->context.risingdetect,
1350 bank->base + bank->regs->risingdetect);
1351
1352 if (bank->loses_context) {
1353 if (!bank->get_context_loss_count) {
1354 omap_gpio_restore_context(bank);
1355 } else {
1356 c = bank->get_context_loss_count(bank->dev);
1357 if (c != bank->context_loss_count) {
1358 omap_gpio_restore_context(bank);
1359 } else {
1360 spin_unlock_irqrestore(&bank->lock, flags);
1361 return 0;
1362 }
1363 }
1364 }
1365
1366 if (!bank->workaround_enabled) {
1367 spin_unlock_irqrestore(&bank->lock, flags);
1368 return 0;
1369 }
1370
1371 l = readl_relaxed(bank->base + bank->regs->datain);
1372
1373 /*
1374 * Check if any of the non-wakeup interrupt GPIOs have changed
1375 * state. If so, generate an IRQ by software. This is
1376 * horribly racy, but it's the best we can do to work around
1377 * this silicon bug.
1378 */
1379 l ^= bank->saved_datain;
1380 l &= bank->enabled_non_wakeup_gpios;
1381
1382 /*
1383 * No need to generate IRQs for the rising edge for gpio IRQs
1384 * configured with falling edge only; and vice versa.
1385 */
1386 gen0 = l & bank->context.fallingdetect;
1387 gen0 &= bank->saved_datain;
1388
1389 gen1 = l & bank->context.risingdetect;
1390 gen1 &= ~(bank->saved_datain);
1391
1392 /* FIXME: Consider GPIO IRQs with level detections properly! */
1393 gen = l & (~(bank->context.fallingdetect) &
1394 ~(bank->context.risingdetect));
1395 /* Consider all GPIO IRQs needed to be updated */
1396 gen |= gen0 | gen1;
1397
1398 if (gen) {
1399 u32 old0, old1;
1400
1401 old0 = readl_relaxed(bank->base + bank->regs->leveldetect0);
1402 old1 = readl_relaxed(bank->base + bank->regs->leveldetect1);
1403
1404 if (!bank->regs->irqstatus_raw0) {
1405 writel_relaxed(old0 | gen, bank->base +
1406 bank->regs->leveldetect0);
1407 writel_relaxed(old1 | gen, bank->base +
1408 bank->regs->leveldetect1);
1409 }
1410
1411 if (bank->regs->irqstatus_raw0) {
1412 writel_relaxed(old0 | l, bank->base +
1413 bank->regs->leveldetect0);
1414 writel_relaxed(old1 | l, bank->base +
1415 bank->regs->leveldetect1);
1416 }
1417 writel_relaxed(old0, bank->base + bank->regs->leveldetect0);
1418 writel_relaxed(old1, bank->base + bank->regs->leveldetect1);
1419 }
1420
1421 bank->workaround_enabled = false;
1422 spin_unlock_irqrestore(&bank->lock, flags);
1423
1424 return 0;
1425}
1426#endif /* CONFIG_PM_RUNTIME */
1427
1428void omap2_gpio_prepare_for_idle(int pwr_mode)
1429{
1430 struct gpio_bank *bank;
1431
1432 list_for_each_entry(bank, &omap_gpio_list, node) {
1433 if (!BANK_USED(bank) || !bank->loses_context)
1434 continue;
1435
1436 bank->power_mode = pwr_mode;
1437
1438 pm_runtime_put_sync_suspend(bank->dev);
1439 }
1440}
1441
1442void omap2_gpio_resume_after_idle(void)
1443{
1444 struct gpio_bank *bank;
1445
1446 list_for_each_entry(bank, &omap_gpio_list, node) {
1447 if (!BANK_USED(bank) || !bank->loses_context)
1448 continue;
1449
1450 pm_runtime_get_sync(bank->dev);
1451 }
1452}
1453
1454#if defined(CONFIG_PM_RUNTIME)
1455static void omap_gpio_init_context(struct gpio_bank *p)
1456{
1457 struct omap_gpio_reg_offs *regs = p->regs;
1458 void __iomem *base = p->base;
1459
1460 p->context.ctrl = readl_relaxed(base + regs->ctrl);
1461 p->context.oe = readl_relaxed(base + regs->direction);
1462 p->context.wake_en = readl_relaxed(base + regs->wkup_en);
1463 p->context.leveldetect0 = readl_relaxed(base + regs->leveldetect0);
1464 p->context.leveldetect1 = readl_relaxed(base + regs->leveldetect1);
1465 p->context.risingdetect = readl_relaxed(base + regs->risingdetect);
1466 p->context.fallingdetect = readl_relaxed(base + regs->fallingdetect);
1467 p->context.irqenable1 = readl_relaxed(base + regs->irqenable);
1468 p->context.irqenable2 = readl_relaxed(base + regs->irqenable2);
1469
1470 if (regs->set_dataout && p->regs->clr_dataout)
1471 p->context.dataout = readl_relaxed(base + regs->set_dataout);
1472 else
1473 p->context.dataout = readl_relaxed(base + regs->dataout);
1474
1475 p->context_valid = true;
1476}
1477
1478static void omap_gpio_restore_context(struct gpio_bank *bank)
1479{
1480 writel_relaxed(bank->context.wake_en,
1481 bank->base + bank->regs->wkup_en);
1482 writel_relaxed(bank->context.ctrl, bank->base + bank->regs->ctrl);
1483 writel_relaxed(bank->context.leveldetect0,
1484 bank->base + bank->regs->leveldetect0);
1485 writel_relaxed(bank->context.leveldetect1,
1486 bank->base + bank->regs->leveldetect1);
1487 writel_relaxed(bank->context.risingdetect,
1488 bank->base + bank->regs->risingdetect);
1489 writel_relaxed(bank->context.fallingdetect,
1490 bank->base + bank->regs->fallingdetect);
1491 if (bank->regs->set_dataout && bank->regs->clr_dataout)
1492 writel_relaxed(bank->context.dataout,
1493 bank->base + bank->regs->set_dataout);
1494 else
1495 writel_relaxed(bank->context.dataout,
1496 bank->base + bank->regs->dataout);
1497 writel_relaxed(bank->context.oe, bank->base + bank->regs->direction);
1498
1499 if (bank->dbck_enable_mask) {
1500 writel_relaxed(bank->context.debounce, bank->base +
1501 bank->regs->debounce);
1502 writel_relaxed(bank->context.debounce_en,
1503 bank->base + bank->regs->debounce_en);
1504 }
1505
1506 writel_relaxed(bank->context.irqenable1,
1507 bank->base + bank->regs->irqenable);
1508 writel_relaxed(bank->context.irqenable2,
1509 bank->base + bank->regs->irqenable2);
1510}
1511#endif /* CONFIG_PM_RUNTIME */
1512#else
1513#define omap_gpio_runtime_suspend NULL
1514#define omap_gpio_runtime_resume NULL
1515static inline void omap_gpio_init_context(struct gpio_bank *p) {}
1516#endif
1517
1518static const struct dev_pm_ops gpio_pm_ops = {
1519 SET_RUNTIME_PM_OPS(omap_gpio_runtime_suspend, omap_gpio_runtime_resume,
1520 NULL)
1521};
1522
1523#if defined(CONFIG_OF)
1524static struct omap_gpio_reg_offs omap2_gpio_regs = {
1525 .revision = OMAP24XX_GPIO_REVISION,
1526 .direction = OMAP24XX_GPIO_OE,
1527 .datain = OMAP24XX_GPIO_DATAIN,
1528 .dataout = OMAP24XX_GPIO_DATAOUT,
1529 .set_dataout = OMAP24XX_GPIO_SETDATAOUT,
1530 .clr_dataout = OMAP24XX_GPIO_CLEARDATAOUT,
1531 .irqstatus = OMAP24XX_GPIO_IRQSTATUS1,
1532 .irqstatus2 = OMAP24XX_GPIO_IRQSTATUS2,
1533 .irqenable = OMAP24XX_GPIO_IRQENABLE1,
1534 .irqenable2 = OMAP24XX_GPIO_IRQENABLE2,
1535 .set_irqenable = OMAP24XX_GPIO_SETIRQENABLE1,
1536 .clr_irqenable = OMAP24XX_GPIO_CLEARIRQENABLE1,
1537 .debounce = OMAP24XX_GPIO_DEBOUNCE_VAL,
1538 .debounce_en = OMAP24XX_GPIO_DEBOUNCE_EN,
1539 .ctrl = OMAP24XX_GPIO_CTRL,
1540 .wkup_en = OMAP24XX_GPIO_WAKE_EN,
1541 .leveldetect0 = OMAP24XX_GPIO_LEVELDETECT0,
1542 .leveldetect1 = OMAP24XX_GPIO_LEVELDETECT1,
1543 .risingdetect = OMAP24XX_GPIO_RISINGDETECT,
1544 .fallingdetect = OMAP24XX_GPIO_FALLINGDETECT,
1545};
1546
1547static struct omap_gpio_reg_offs omap4_gpio_regs = {
1548 .revision = OMAP4_GPIO_REVISION,
1549 .direction = OMAP4_GPIO_OE,
1550 .datain = OMAP4_GPIO_DATAIN,
1551 .dataout = OMAP4_GPIO_DATAOUT,
1552 .set_dataout = OMAP4_GPIO_SETDATAOUT,
1553 .clr_dataout = OMAP4_GPIO_CLEARDATAOUT,
1554 .irqstatus = OMAP4_GPIO_IRQSTATUS0,
1555 .irqstatus2 = OMAP4_GPIO_IRQSTATUS1,
1556 .irqenable = OMAP4_GPIO_IRQSTATUSSET0,
1557 .irqenable2 = OMAP4_GPIO_IRQSTATUSSET1,
1558 .set_irqenable = OMAP4_GPIO_IRQSTATUSSET0,
1559 .clr_irqenable = OMAP4_GPIO_IRQSTATUSCLR0,
1560 .debounce = OMAP4_GPIO_DEBOUNCINGTIME,
1561 .debounce_en = OMAP4_GPIO_DEBOUNCENABLE,
1562 .ctrl = OMAP4_GPIO_CTRL,
1563 .wkup_en = OMAP4_GPIO_IRQWAKEN0,
1564 .leveldetect0 = OMAP4_GPIO_LEVELDETECT0,
1565 .leveldetect1 = OMAP4_GPIO_LEVELDETECT1,
1566 .risingdetect = OMAP4_GPIO_RISINGDETECT,
1567 .fallingdetect = OMAP4_GPIO_FALLINGDETECT,
1568};
1569
1570static const struct omap_gpio_platform_data omap2_pdata = {
1571 .regs = &omap2_gpio_regs,
1572 .bank_width = 32,
1573 .dbck_flag = false,
1574};
1575
1576static const struct omap_gpio_platform_data omap3_pdata = {
1577 .regs = &omap2_gpio_regs,
1578 .bank_width = 32,
1579 .dbck_flag = true,
1580};
1581
1582static const struct omap_gpio_platform_data omap4_pdata = {
1583 .regs = &omap4_gpio_regs,
1584 .bank_width = 32,
1585 .dbck_flag = true,
1586};
1587
1588static const struct of_device_id omap_gpio_match[] = {
1589 {
1590 .compatible = "ti,omap4-gpio",
1591 .data = &omap4_pdata,
1592 },
1593 {
1594 .compatible = "ti,omap3-gpio",
1595 .data = &omap3_pdata,
1596 },
1597 {
1598 .compatible = "ti,omap2-gpio",
1599 .data = &omap2_pdata,
1600 },
1601 { },
1602};
1603MODULE_DEVICE_TABLE(of, omap_gpio_match);
1604#endif
1605
1606static struct platform_driver omap_gpio_driver = {
1607 .probe = omap_gpio_probe,
1608 .driver = {
1609 .name = "omap_gpio",
1610 .pm = &gpio_pm_ops,
1611 .of_match_table = of_match_ptr(omap_gpio_match),
1612 },
1613};
1614
1615/*
1616 * gpio driver register needs to be done before
1617 * machine_init functions access gpio APIs.
1618 * Hence omap_gpio_drv_reg() is a postcore_initcall.
1619 */
1620static int __init omap_gpio_drv_reg(void)
1621{
1622 return platform_driver_register(&omap_gpio_driver);
1623}
1624postcore_initcall(omap_gpio_drv_reg);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Support functions for OMAP GPIO
4 *
5 * Copyright (C) 2003-2005 Nokia Corporation
6 * Written by Juha Yrjölä <juha.yrjola@nokia.com>
7 *
8 * Copyright (C) 2009 Texas Instruments
9 * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
10 */
11
12#include <linux/init.h>
13#include <linux/module.h>
14#include <linux/interrupt.h>
15#include <linux/syscore_ops.h>
16#include <linux/err.h>
17#include <linux/clk.h>
18#include <linux/io.h>
19#include <linux/cpu_pm.h>
20#include <linux/device.h>
21#include <linux/pm_runtime.h>
22#include <linux/pm.h>
23#include <linux/of.h>
24#include <linux/of_device.h>
25#include <linux/gpio/driver.h>
26#include <linux/bitops.h>
27#include <linux/platform_data/gpio-omap.h>
28
29#define OMAP4_GPIO_DEBOUNCINGTIME_MASK 0xFF
30
31struct gpio_regs {
32 u32 sysconfig;
33 u32 irqenable1;
34 u32 irqenable2;
35 u32 wake_en;
36 u32 ctrl;
37 u32 oe;
38 u32 leveldetect0;
39 u32 leveldetect1;
40 u32 risingdetect;
41 u32 fallingdetect;
42 u32 dataout;
43 u32 debounce;
44 u32 debounce_en;
45};
46
47struct gpio_bank {
48 void __iomem *base;
49 const struct omap_gpio_reg_offs *regs;
50
51 int irq;
52 u32 non_wakeup_gpios;
53 u32 enabled_non_wakeup_gpios;
54 struct gpio_regs context;
55 u32 saved_datain;
56 u32 level_mask;
57 u32 toggle_mask;
58 raw_spinlock_t lock;
59 raw_spinlock_t wa_lock;
60 struct gpio_chip chip;
61 struct clk *dbck;
62 struct notifier_block nb;
63 unsigned int is_suspended:1;
64 unsigned int needs_resume:1;
65 u32 mod_usage;
66 u32 irq_usage;
67 u32 dbck_enable_mask;
68 bool dbck_enabled;
69 bool is_mpuio;
70 bool dbck_flag;
71 bool loses_context;
72 bool context_valid;
73 int stride;
74 u32 width;
75 int context_loss_count;
76
77 void (*set_dataout)(struct gpio_bank *bank, unsigned gpio, int enable);
78 int (*get_context_loss_count)(struct device *dev);
79};
80
81#define GPIO_MOD_CTRL_BIT BIT(0)
82
83#define BANK_USED(bank) (bank->mod_usage || bank->irq_usage)
84#define LINE_USED(line, offset) (line & (BIT(offset)))
85
86static void omap_gpio_unmask_irq(struct irq_data *d);
87
88static inline struct gpio_bank *omap_irq_data_get_bank(struct irq_data *d)
89{
90 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
91 return gpiochip_get_data(chip);
92}
93
94static inline u32 omap_gpio_rmw(void __iomem *reg, u32 mask, bool set)
95{
96 u32 val = readl_relaxed(reg);
97
98 if (set)
99 val |= mask;
100 else
101 val &= ~mask;
102
103 writel_relaxed(val, reg);
104
105 return val;
106}
107
108static void omap_set_gpio_direction(struct gpio_bank *bank, int gpio,
109 int is_input)
110{
111 bank->context.oe = omap_gpio_rmw(bank->base + bank->regs->direction,
112 BIT(gpio), is_input);
113}
114
115
116/* set data out value using dedicate set/clear register */
117static void omap_set_gpio_dataout_reg(struct gpio_bank *bank, unsigned offset,
118 int enable)
119{
120 void __iomem *reg = bank->base;
121 u32 l = BIT(offset);
122
123 if (enable) {
124 reg += bank->regs->set_dataout;
125 bank->context.dataout |= l;
126 } else {
127 reg += bank->regs->clr_dataout;
128 bank->context.dataout &= ~l;
129 }
130
131 writel_relaxed(l, reg);
132}
133
134/* set data out value using mask register */
135static void omap_set_gpio_dataout_mask(struct gpio_bank *bank, unsigned offset,
136 int enable)
137{
138 bank->context.dataout = omap_gpio_rmw(bank->base + bank->regs->dataout,
139 BIT(offset), enable);
140}
141
142static inline void omap_gpio_dbck_enable(struct gpio_bank *bank)
143{
144 if (bank->dbck_enable_mask && !bank->dbck_enabled) {
145 clk_enable(bank->dbck);
146 bank->dbck_enabled = true;
147
148 writel_relaxed(bank->dbck_enable_mask,
149 bank->base + bank->regs->debounce_en);
150 }
151}
152
153static inline void omap_gpio_dbck_disable(struct gpio_bank *bank)
154{
155 if (bank->dbck_enable_mask && bank->dbck_enabled) {
156 /*
157 * Disable debounce before cutting it's clock. If debounce is
158 * enabled but the clock is not, GPIO module seems to be unable
159 * to detect events and generate interrupts at least on OMAP3.
160 */
161 writel_relaxed(0, bank->base + bank->regs->debounce_en);
162
163 clk_disable(bank->dbck);
164 bank->dbck_enabled = false;
165 }
166}
167
168/**
169 * omap2_set_gpio_debounce - low level gpio debounce time
170 * @bank: the gpio bank we're acting upon
171 * @offset: the gpio number on this @bank
172 * @debounce: debounce time to use
173 *
174 * OMAP's debounce time is in 31us steps
175 * <debounce time> = (GPIO_DEBOUNCINGTIME[7:0].DEBOUNCETIME + 1) x 31
176 * so we need to convert and round up to the closest unit.
177 *
178 * Return: 0 on success, negative error otherwise.
179 */
180static int omap2_set_gpio_debounce(struct gpio_bank *bank, unsigned offset,
181 unsigned debounce)
182{
183 u32 val;
184 u32 l;
185 bool enable = !!debounce;
186
187 if (!bank->dbck_flag)
188 return -ENOTSUPP;
189
190 if (enable) {
191 debounce = DIV_ROUND_UP(debounce, 31) - 1;
192 if ((debounce & OMAP4_GPIO_DEBOUNCINGTIME_MASK) != debounce)
193 return -EINVAL;
194 }
195
196 l = BIT(offset);
197
198 clk_enable(bank->dbck);
199 writel_relaxed(debounce, bank->base + bank->regs->debounce);
200
201 val = omap_gpio_rmw(bank->base + bank->regs->debounce_en, l, enable);
202 bank->dbck_enable_mask = val;
203
204 clk_disable(bank->dbck);
205 /*
206 * Enable debounce clock per module.
207 * This call is mandatory because in omap_gpio_request() when
208 * *_runtime_get_sync() is called, _gpio_dbck_enable() within
209 * runtime callbck fails to turn on dbck because dbck_enable_mask
210 * used within _gpio_dbck_enable() is still not initialized at
211 * that point. Therefore we have to enable dbck here.
212 */
213 omap_gpio_dbck_enable(bank);
214 if (bank->dbck_enable_mask) {
215 bank->context.debounce = debounce;
216 bank->context.debounce_en = val;
217 }
218
219 return 0;
220}
221
222/**
223 * omap_clear_gpio_debounce - clear debounce settings for a gpio
224 * @bank: the gpio bank we're acting upon
225 * @offset: the gpio number on this @bank
226 *
227 * If a gpio is using debounce, then clear the debounce enable bit and if
228 * this is the only gpio in this bank using debounce, then clear the debounce
229 * time too. The debounce clock will also be disabled when calling this function
230 * if this is the only gpio in the bank using debounce.
231 */
232static void omap_clear_gpio_debounce(struct gpio_bank *bank, unsigned offset)
233{
234 u32 gpio_bit = BIT(offset);
235
236 if (!bank->dbck_flag)
237 return;
238
239 if (!(bank->dbck_enable_mask & gpio_bit))
240 return;
241
242 bank->dbck_enable_mask &= ~gpio_bit;
243 bank->context.debounce_en &= ~gpio_bit;
244 writel_relaxed(bank->context.debounce_en,
245 bank->base + bank->regs->debounce_en);
246
247 if (!bank->dbck_enable_mask) {
248 bank->context.debounce = 0;
249 writel_relaxed(bank->context.debounce, bank->base +
250 bank->regs->debounce);
251 clk_disable(bank->dbck);
252 bank->dbck_enabled = false;
253 }
254}
255
256/*
257 * Off mode wake-up capable GPIOs in bank(s) that are in the wakeup domain.
258 * See TRM section for GPIO for "Wake-Up Generation" for the list of GPIOs
259 * in wakeup domain. If bank->non_wakeup_gpios is not configured, assume none
260 * are capable waking up the system from off mode.
261 */
262static bool omap_gpio_is_off_wakeup_capable(struct gpio_bank *bank, u32 gpio_mask)
263{
264 u32 no_wake = bank->non_wakeup_gpios;
265
266 if (no_wake)
267 return !!(~no_wake & gpio_mask);
268
269 return false;
270}
271
272static inline void omap_set_gpio_trigger(struct gpio_bank *bank, int gpio,
273 unsigned trigger)
274{
275 void __iomem *base = bank->base;
276 u32 gpio_bit = BIT(gpio);
277
278 omap_gpio_rmw(base + bank->regs->leveldetect0, gpio_bit,
279 trigger & IRQ_TYPE_LEVEL_LOW);
280 omap_gpio_rmw(base + bank->regs->leveldetect1, gpio_bit,
281 trigger & IRQ_TYPE_LEVEL_HIGH);
282
283 /*
284 * We need the edge detection enabled for to allow the GPIO block
285 * to be woken from idle state. Set the appropriate edge detection
286 * in addition to the level detection.
287 */
288 omap_gpio_rmw(base + bank->regs->risingdetect, gpio_bit,
289 trigger & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_LEVEL_HIGH));
290 omap_gpio_rmw(base + bank->regs->fallingdetect, gpio_bit,
291 trigger & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_LEVEL_LOW));
292
293 bank->context.leveldetect0 =
294 readl_relaxed(bank->base + bank->regs->leveldetect0);
295 bank->context.leveldetect1 =
296 readl_relaxed(bank->base + bank->regs->leveldetect1);
297 bank->context.risingdetect =
298 readl_relaxed(bank->base + bank->regs->risingdetect);
299 bank->context.fallingdetect =
300 readl_relaxed(bank->base + bank->regs->fallingdetect);
301
302 bank->level_mask = bank->context.leveldetect0 |
303 bank->context.leveldetect1;
304
305 /* This part needs to be executed always for OMAP{34xx, 44xx} */
306 if (!bank->regs->irqctrl && !omap_gpio_is_off_wakeup_capable(bank, gpio)) {
307 /*
308 * Log the edge gpio and manually trigger the IRQ
309 * after resume if the input level changes
310 * to avoid irq lost during PER RET/OFF mode
311 * Applies for omap2 non-wakeup gpio and all omap3 gpios
312 */
313 if (trigger & IRQ_TYPE_EDGE_BOTH)
314 bank->enabled_non_wakeup_gpios |= gpio_bit;
315 else
316 bank->enabled_non_wakeup_gpios &= ~gpio_bit;
317 }
318}
319
320/*
321 * This only applies to chips that can't do both rising and falling edge
322 * detection at once. For all other chips, this function is a noop.
323 */
324static void omap_toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio)
325{
326 if (IS_ENABLED(CONFIG_ARCH_OMAP1) && bank->regs->irqctrl) {
327 void __iomem *reg = bank->base + bank->regs->irqctrl;
328
329 writel_relaxed(readl_relaxed(reg) ^ BIT(gpio), reg);
330 }
331}
332
333static int omap_set_gpio_triggering(struct gpio_bank *bank, int gpio,
334 unsigned trigger)
335{
336 void __iomem *reg = bank->base;
337 u32 l = 0;
338
339 if (bank->regs->leveldetect0 && bank->regs->wkup_en) {
340 omap_set_gpio_trigger(bank, gpio, trigger);
341 } else if (bank->regs->irqctrl) {
342 reg += bank->regs->irqctrl;
343
344 l = readl_relaxed(reg);
345 if ((trigger & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH)
346 bank->toggle_mask |= BIT(gpio);
347 if (trigger & IRQ_TYPE_EDGE_RISING)
348 l |= BIT(gpio);
349 else if (trigger & IRQ_TYPE_EDGE_FALLING)
350 l &= ~(BIT(gpio));
351 else
352 return -EINVAL;
353
354 writel_relaxed(l, reg);
355 } else if (bank->regs->edgectrl1) {
356 if (gpio & 0x08)
357 reg += bank->regs->edgectrl2;
358 else
359 reg += bank->regs->edgectrl1;
360
361 gpio &= 0x07;
362 l = readl_relaxed(reg);
363 l &= ~(3 << (gpio << 1));
364 if (trigger & IRQ_TYPE_EDGE_RISING)
365 l |= 2 << (gpio << 1);
366 if (trigger & IRQ_TYPE_EDGE_FALLING)
367 l |= BIT(gpio << 1);
368 writel_relaxed(l, reg);
369 }
370 return 0;
371}
372
373static void omap_enable_gpio_module(struct gpio_bank *bank, unsigned offset)
374{
375 if (bank->regs->pinctrl) {
376 void __iomem *reg = bank->base + bank->regs->pinctrl;
377
378 /* Claim the pin for MPU */
379 writel_relaxed(readl_relaxed(reg) | (BIT(offset)), reg);
380 }
381
382 if (bank->regs->ctrl && !BANK_USED(bank)) {
383 void __iomem *reg = bank->base + bank->regs->ctrl;
384 u32 ctrl;
385
386 ctrl = readl_relaxed(reg);
387 /* Module is enabled, clocks are not gated */
388 ctrl &= ~GPIO_MOD_CTRL_BIT;
389 writel_relaxed(ctrl, reg);
390 bank->context.ctrl = ctrl;
391 }
392}
393
394static void omap_disable_gpio_module(struct gpio_bank *bank, unsigned offset)
395{
396 if (bank->regs->ctrl && !BANK_USED(bank)) {
397 void __iomem *reg = bank->base + bank->regs->ctrl;
398 u32 ctrl;
399
400 ctrl = readl_relaxed(reg);
401 /* Module is disabled, clocks are gated */
402 ctrl |= GPIO_MOD_CTRL_BIT;
403 writel_relaxed(ctrl, reg);
404 bank->context.ctrl = ctrl;
405 }
406}
407
408static int omap_gpio_is_input(struct gpio_bank *bank, unsigned offset)
409{
410 void __iomem *reg = bank->base + bank->regs->direction;
411
412 return readl_relaxed(reg) & BIT(offset);
413}
414
415static void omap_gpio_init_irq(struct gpio_bank *bank, unsigned offset)
416{
417 if (!LINE_USED(bank->mod_usage, offset)) {
418 omap_enable_gpio_module(bank, offset);
419 omap_set_gpio_direction(bank, offset, 1);
420 }
421 bank->irq_usage |= BIT(offset);
422}
423
424static int omap_gpio_irq_type(struct irq_data *d, unsigned type)
425{
426 struct gpio_bank *bank = omap_irq_data_get_bank(d);
427 int retval;
428 unsigned long flags;
429 unsigned offset = d->hwirq;
430
431 if (type & ~IRQ_TYPE_SENSE_MASK)
432 return -EINVAL;
433
434 if (!bank->regs->leveldetect0 &&
435 (type & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH)))
436 return -EINVAL;
437
438 raw_spin_lock_irqsave(&bank->lock, flags);
439 retval = omap_set_gpio_triggering(bank, offset, type);
440 if (retval) {
441 raw_spin_unlock_irqrestore(&bank->lock, flags);
442 goto error;
443 }
444 omap_gpio_init_irq(bank, offset);
445 if (!omap_gpio_is_input(bank, offset)) {
446 raw_spin_unlock_irqrestore(&bank->lock, flags);
447 retval = -EINVAL;
448 goto error;
449 }
450 raw_spin_unlock_irqrestore(&bank->lock, flags);
451
452 if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
453 irq_set_handler_locked(d, handle_level_irq);
454 else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
455 /*
456 * Edge IRQs are already cleared/acked in irq_handler and
457 * not need to be masked, as result handle_edge_irq()
458 * logic is excessed here and may cause lose of interrupts.
459 * So just use handle_simple_irq.
460 */
461 irq_set_handler_locked(d, handle_simple_irq);
462
463 return 0;
464
465error:
466 return retval;
467}
468
469static void omap_clear_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
470{
471 void __iomem *reg = bank->base;
472
473 reg += bank->regs->irqstatus;
474 writel_relaxed(gpio_mask, reg);
475
476 /* Workaround for clearing DSP GPIO interrupts to allow retention */
477 if (bank->regs->irqstatus2) {
478 reg = bank->base + bank->regs->irqstatus2;
479 writel_relaxed(gpio_mask, reg);
480 }
481
482 /* Flush posted write for the irq status to avoid spurious interrupts */
483 readl_relaxed(reg);
484}
485
486static inline void omap_clear_gpio_irqstatus(struct gpio_bank *bank,
487 unsigned offset)
488{
489 omap_clear_gpio_irqbank(bank, BIT(offset));
490}
491
492static u32 omap_get_gpio_irqbank_mask(struct gpio_bank *bank)
493{
494 void __iomem *reg = bank->base;
495 u32 l;
496 u32 mask = (BIT(bank->width)) - 1;
497
498 reg += bank->regs->irqenable;
499 l = readl_relaxed(reg);
500 if (bank->regs->irqenable_inv)
501 l = ~l;
502 l &= mask;
503 return l;
504}
505
506static inline void omap_set_gpio_irqenable(struct gpio_bank *bank,
507 unsigned offset, int enable)
508{
509 void __iomem *reg = bank->base;
510 u32 gpio_mask = BIT(offset);
511
512 if (bank->regs->set_irqenable && bank->regs->clr_irqenable) {
513 if (enable) {
514 reg += bank->regs->set_irqenable;
515 bank->context.irqenable1 |= gpio_mask;
516 } else {
517 reg += bank->regs->clr_irqenable;
518 bank->context.irqenable1 &= ~gpio_mask;
519 }
520 writel_relaxed(gpio_mask, reg);
521 } else {
522 bank->context.irqenable1 =
523 omap_gpio_rmw(reg + bank->regs->irqenable, gpio_mask,
524 enable ^ bank->regs->irqenable_inv);
525 }
526
527 /*
528 * Program GPIO wakeup along with IRQ enable to satisfy OMAP4430 TRM
529 * note requiring correlation between the IRQ enable registers and
530 * the wakeup registers. In any case, we want wakeup from idle
531 * enabled for the GPIOs which support this feature.
532 */
533 if (bank->regs->wkup_en &&
534 (bank->regs->edgectrl1 || !(bank->non_wakeup_gpios & gpio_mask))) {
535 bank->context.wake_en =
536 omap_gpio_rmw(bank->base + bank->regs->wkup_en,
537 gpio_mask, enable);
538 }
539}
540
541/* Use disable_irq_wake() and enable_irq_wake() functions from drivers */
542static int omap_gpio_wake_enable(struct irq_data *d, unsigned int enable)
543{
544 struct gpio_bank *bank = omap_irq_data_get_bank(d);
545
546 return irq_set_irq_wake(bank->irq, enable);
547}
548
549/*
550 * We need to unmask the GPIO bank interrupt as soon as possible to
551 * avoid missing GPIO interrupts for other lines in the bank.
552 * Then we need to mask-read-clear-unmask the triggered GPIO lines
553 * in the bank to avoid missing nested interrupts for a GPIO line.
554 * If we wait to unmask individual GPIO lines in the bank after the
555 * line's interrupt handler has been run, we may miss some nested
556 * interrupts.
557 */
558static irqreturn_t omap_gpio_irq_handler(int irq, void *gpiobank)
559{
560 void __iomem *isr_reg = NULL;
561 u32 enabled, isr, edge;
562 unsigned int bit;
563 struct gpio_bank *bank = gpiobank;
564 unsigned long wa_lock_flags;
565 unsigned long lock_flags;
566
567 isr_reg = bank->base + bank->regs->irqstatus;
568 if (WARN_ON(!isr_reg))
569 goto exit;
570
571 if (WARN_ONCE(!pm_runtime_active(bank->chip.parent),
572 "gpio irq%i while runtime suspended?\n", irq))
573 return IRQ_NONE;
574
575 while (1) {
576 raw_spin_lock_irqsave(&bank->lock, lock_flags);
577
578 enabled = omap_get_gpio_irqbank_mask(bank);
579 isr = readl_relaxed(isr_reg) & enabled;
580
581 /*
582 * Clear edge sensitive interrupts before calling handler(s)
583 * so subsequent edge transitions are not missed while the
584 * handlers are running.
585 */
586 edge = isr & ~bank->level_mask;
587 if (edge)
588 omap_clear_gpio_irqbank(bank, edge);
589
590 raw_spin_unlock_irqrestore(&bank->lock, lock_flags);
591
592 if (!isr)
593 break;
594
595 while (isr) {
596 bit = __ffs(isr);
597 isr &= ~(BIT(bit));
598
599 raw_spin_lock_irqsave(&bank->lock, lock_flags);
600 /*
601 * Some chips can't respond to both rising and falling
602 * at the same time. If this irq was requested with
603 * both flags, we need to flip the ICR data for the IRQ
604 * to respond to the IRQ for the opposite direction.
605 * This will be indicated in the bank toggle_mask.
606 */
607 if (bank->toggle_mask & (BIT(bit)))
608 omap_toggle_gpio_edge_triggering(bank, bit);
609
610 raw_spin_unlock_irqrestore(&bank->lock, lock_flags);
611
612 raw_spin_lock_irqsave(&bank->wa_lock, wa_lock_flags);
613
614 generic_handle_irq(irq_find_mapping(bank->chip.irq.domain,
615 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}
686
687static void omap_gpio_unmask_irq(struct irq_data *d)
688{
689 struct gpio_bank *bank = omap_irq_data_get_bank(d);
690 unsigned offset = d->hwirq;
691 u32 trigger = irqd_get_trigger_type(d);
692 unsigned long flags;
693
694 raw_spin_lock_irqsave(&bank->lock, flags);
695 omap_set_gpio_irqenable(bank, offset, 1);
696
697 /*
698 * For level-triggered GPIOs, clearing must be done after the source
699 * is cleared, thus after the handler has run. OMAP4 needs this done
700 * after enabing the interrupt to clear the wakeup status.
701 */
702 if (bank->regs->leveldetect0 && bank->regs->wkup_en &&
703 trigger & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
704 omap_clear_gpio_irqstatus(bank, offset);
705
706 if (trigger)
707 omap_set_gpio_triggering(bank, offset, trigger);
708
709 raw_spin_unlock_irqrestore(&bank->lock, flags);
710}
711
712/*---------------------------------------------------------------------*/
713
714static int omap_mpuio_suspend_noirq(struct device *dev)
715{
716 struct gpio_bank *bank = dev_get_drvdata(dev);
717 void __iomem *mask_reg = bank->base +
718 OMAP_MPUIO_GPIO_MASKIT / bank->stride;
719 unsigned long flags;
720
721 raw_spin_lock_irqsave(&bank->lock, flags);
722 writel_relaxed(0xffff & ~bank->context.wake_en, mask_reg);
723 raw_spin_unlock_irqrestore(&bank->lock, flags);
724
725 return 0;
726}
727
728static int omap_mpuio_resume_noirq(struct device *dev)
729{
730 struct gpio_bank *bank = dev_get_drvdata(dev);
731 void __iomem *mask_reg = bank->base +
732 OMAP_MPUIO_GPIO_MASKIT / bank->stride;
733 unsigned long flags;
734
735 raw_spin_lock_irqsave(&bank->lock, flags);
736 writel_relaxed(bank->context.wake_en, mask_reg);
737 raw_spin_unlock_irqrestore(&bank->lock, flags);
738
739 return 0;
740}
741
742static const struct dev_pm_ops omap_mpuio_dev_pm_ops = {
743 .suspend_noirq = omap_mpuio_suspend_noirq,
744 .resume_noirq = omap_mpuio_resume_noirq,
745};
746
747/* use platform_driver for this. */
748static struct platform_driver omap_mpuio_driver = {
749 .driver = {
750 .name = "mpuio",
751 .pm = &omap_mpuio_dev_pm_ops,
752 },
753};
754
755static struct platform_device omap_mpuio_device = {
756 .name = "mpuio",
757 .id = -1,
758 .dev = {
759 .driver = &omap_mpuio_driver.driver,
760 }
761 /* could list the /proc/iomem resources */
762};
763
764static inline void omap_mpuio_init(struct gpio_bank *bank)
765{
766 platform_set_drvdata(&omap_mpuio_device, bank);
767
768 if (platform_driver_register(&omap_mpuio_driver) == 0)
769 (void) platform_device_register(&omap_mpuio_device);
770}
771
772/*---------------------------------------------------------------------*/
773
774static int omap_gpio_request(struct gpio_chip *chip, unsigned offset)
775{
776 struct gpio_bank *bank = gpiochip_get_data(chip);
777 unsigned long flags;
778
779 pm_runtime_get_sync(chip->parent);
780
781 raw_spin_lock_irqsave(&bank->lock, flags);
782 omap_enable_gpio_module(bank, offset);
783 bank->mod_usage |= BIT(offset);
784 raw_spin_unlock_irqrestore(&bank->lock, flags);
785
786 return 0;
787}
788
789static void omap_gpio_free(struct gpio_chip *chip, unsigned offset)
790{
791 struct gpio_bank *bank = gpiochip_get_data(chip);
792 unsigned long flags;
793
794 raw_spin_lock_irqsave(&bank->lock, flags);
795 bank->mod_usage &= ~(BIT(offset));
796 if (!LINE_USED(bank->irq_usage, offset)) {
797 omap_set_gpio_direction(bank, offset, 1);
798 omap_clear_gpio_debounce(bank, offset);
799 }
800 omap_disable_gpio_module(bank, offset);
801 raw_spin_unlock_irqrestore(&bank->lock, flags);
802
803 pm_runtime_put(chip->parent);
804}
805
806static int omap_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
807{
808 struct gpio_bank *bank = gpiochip_get_data(chip);
809
810 if (readl_relaxed(bank->base + bank->regs->direction) & BIT(offset))
811 return GPIO_LINE_DIRECTION_IN;
812
813 return GPIO_LINE_DIRECTION_OUT;
814}
815
816static int omap_gpio_input(struct gpio_chip *chip, unsigned offset)
817{
818 struct gpio_bank *bank;
819 unsigned long flags;
820
821 bank = gpiochip_get_data(chip);
822 raw_spin_lock_irqsave(&bank->lock, flags);
823 omap_set_gpio_direction(bank, offset, 1);
824 raw_spin_unlock_irqrestore(&bank->lock, flags);
825 return 0;
826}
827
828static int omap_gpio_get(struct gpio_chip *chip, unsigned offset)
829{
830 struct gpio_bank *bank = gpiochip_get_data(chip);
831 void __iomem *reg;
832
833 if (omap_gpio_is_input(bank, offset))
834 reg = bank->base + bank->regs->datain;
835 else
836 reg = bank->base + bank->regs->dataout;
837
838 return (readl_relaxed(reg) & BIT(offset)) != 0;
839}
840
841static int omap_gpio_output(struct gpio_chip *chip, unsigned offset, int value)
842{
843 struct gpio_bank *bank;
844 unsigned long flags;
845
846 bank = gpiochip_get_data(chip);
847 raw_spin_lock_irqsave(&bank->lock, flags);
848 bank->set_dataout(bank, offset, value);
849 omap_set_gpio_direction(bank, offset, 0);
850 raw_spin_unlock_irqrestore(&bank->lock, flags);
851 return 0;
852}
853
854static int omap_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,
855 unsigned long *bits)
856{
857 struct gpio_bank *bank = gpiochip_get_data(chip);
858 void __iomem *base = bank->base;
859 u32 direction, m, val = 0;
860
861 direction = readl_relaxed(base + bank->regs->direction);
862
863 m = direction & *mask;
864 if (m)
865 val |= readl_relaxed(base + bank->regs->datain) & m;
866
867 m = ~direction & *mask;
868 if (m)
869 val |= readl_relaxed(base + bank->regs->dataout) & m;
870
871 *bits = val;
872
873 return 0;
874}
875
876static int omap_gpio_debounce(struct gpio_chip *chip, unsigned offset,
877 unsigned debounce)
878{
879 struct gpio_bank *bank;
880 unsigned long flags;
881 int ret;
882
883 bank = gpiochip_get_data(chip);
884
885 raw_spin_lock_irqsave(&bank->lock, flags);
886 ret = omap2_set_gpio_debounce(bank, offset, debounce);
887 raw_spin_unlock_irqrestore(&bank->lock, flags);
888
889 if (ret)
890 dev_info(chip->parent,
891 "Could not set line %u debounce to %u microseconds (%d)",
892 offset, debounce, ret);
893
894 return ret;
895}
896
897static int omap_gpio_set_config(struct gpio_chip *chip, unsigned offset,
898 unsigned long config)
899{
900 u32 debounce;
901 int ret = -ENOTSUPP;
902
903 switch (pinconf_to_config_param(config)) {
904 case PIN_CONFIG_BIAS_DISABLE:
905 case PIN_CONFIG_BIAS_PULL_UP:
906 case PIN_CONFIG_BIAS_PULL_DOWN:
907 ret = gpiochip_generic_config(chip, offset, config);
908 break;
909 case PIN_CONFIG_INPUT_DEBOUNCE:
910 debounce = pinconf_to_config_argument(config);
911 ret = omap_gpio_debounce(chip, offset, debounce);
912 break;
913 default:
914 break;
915 }
916
917 return ret;
918}
919
920static void omap_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
921{
922 struct gpio_bank *bank;
923 unsigned long flags;
924
925 bank = gpiochip_get_data(chip);
926 raw_spin_lock_irqsave(&bank->lock, flags);
927 bank->set_dataout(bank, offset, value);
928 raw_spin_unlock_irqrestore(&bank->lock, flags);
929}
930
931static void omap_gpio_set_multiple(struct gpio_chip *chip, unsigned long *mask,
932 unsigned long *bits)
933{
934 struct gpio_bank *bank = gpiochip_get_data(chip);
935 void __iomem *reg = bank->base + bank->regs->dataout;
936 unsigned long flags;
937 u32 l;
938
939 raw_spin_lock_irqsave(&bank->lock, flags);
940 l = (readl_relaxed(reg) & ~*mask) | (*bits & *mask);
941 writel_relaxed(l, reg);
942 bank->context.dataout = l;
943 raw_spin_unlock_irqrestore(&bank->lock, flags);
944}
945
946/*---------------------------------------------------------------------*/
947
948static void omap_gpio_show_rev(struct gpio_bank *bank)
949{
950 static bool called;
951 u32 rev;
952
953 if (called || bank->regs->revision == USHRT_MAX)
954 return;
955
956 rev = readw_relaxed(bank->base + bank->regs->revision);
957 pr_info("OMAP GPIO hardware version %d.%d\n",
958 (rev >> 4) & 0x0f, rev & 0x0f);
959
960 called = true;
961}
962
963static void omap_gpio_mod_init(struct gpio_bank *bank)
964{
965 void __iomem *base = bank->base;
966 u32 l = 0xffffffff;
967
968 if (bank->width == 16)
969 l = 0xffff;
970
971 if (bank->is_mpuio) {
972 writel_relaxed(l, bank->base + bank->regs->irqenable);
973 return;
974 }
975
976 omap_gpio_rmw(base + bank->regs->irqenable, l,
977 bank->regs->irqenable_inv);
978 omap_gpio_rmw(base + bank->regs->irqstatus, l,
979 !bank->regs->irqenable_inv);
980 if (bank->regs->debounce_en)
981 writel_relaxed(0, base + bank->regs->debounce_en);
982
983 /* Save OE default value (0xffffffff) in the context */
984 bank->context.oe = readl_relaxed(bank->base + bank->regs->direction);
985 /* Initialize interface clk ungated, module enabled */
986 if (bank->regs->ctrl)
987 writel_relaxed(0, base + bank->regs->ctrl);
988}
989
990static int omap_gpio_chip_init(struct gpio_bank *bank, struct irq_chip *irqc)
991{
992 struct gpio_irq_chip *irq;
993 static int gpio;
994 const char *label;
995 int irq_base = 0;
996 int ret;
997
998 /*
999 * REVISIT eventually switch from OMAP-specific gpio structs
1000 * over to the generic ones
1001 */
1002 bank->chip.request = omap_gpio_request;
1003 bank->chip.free = omap_gpio_free;
1004 bank->chip.get_direction = omap_gpio_get_direction;
1005 bank->chip.direction_input = omap_gpio_input;
1006 bank->chip.get = omap_gpio_get;
1007 bank->chip.get_multiple = omap_gpio_get_multiple;
1008 bank->chip.direction_output = omap_gpio_output;
1009 bank->chip.set_config = omap_gpio_set_config;
1010 bank->chip.set = omap_gpio_set;
1011 bank->chip.set_multiple = omap_gpio_set_multiple;
1012 if (bank->is_mpuio) {
1013 bank->chip.label = "mpuio";
1014 if (bank->regs->wkup_en)
1015 bank->chip.parent = &omap_mpuio_device.dev;
1016 bank->chip.base = OMAP_MPUIO(0);
1017 } else {
1018 label = devm_kasprintf(bank->chip.parent, GFP_KERNEL, "gpio-%d-%d",
1019 gpio, gpio + bank->width - 1);
1020 if (!label)
1021 return -ENOMEM;
1022 bank->chip.label = label;
1023 bank->chip.base = gpio;
1024 }
1025 bank->chip.ngpio = bank->width;
1026
1027#ifdef CONFIG_ARCH_OMAP1
1028 /*
1029 * REVISIT: Once we have OMAP1 supporting SPARSE_IRQ, we can drop
1030 * irq_alloc_descs() since a base IRQ offset will no longer be needed.
1031 */
1032 irq_base = devm_irq_alloc_descs(bank->chip.parent,
1033 -1, 0, bank->width, 0);
1034 if (irq_base < 0) {
1035 dev_err(bank->chip.parent, "Couldn't allocate IRQ numbers\n");
1036 return -ENODEV;
1037 }
1038#endif
1039
1040 /* MPUIO is a bit different, reading IRQ status clears it */
1041 if (bank->is_mpuio && !bank->regs->wkup_en)
1042 irqc->irq_set_wake = NULL;
1043
1044 irq = &bank->chip.irq;
1045 irq->chip = irqc;
1046 irq->handler = handle_bad_irq;
1047 irq->default_type = IRQ_TYPE_NONE;
1048 irq->num_parents = 1;
1049 irq->parents = &bank->irq;
1050 irq->first = irq_base;
1051
1052 ret = gpiochip_add_data(&bank->chip, bank);
1053 if (ret)
1054 return dev_err_probe(bank->chip.parent, ret, "Could not register gpio chip\n");
1055
1056 ret = devm_request_irq(bank->chip.parent, bank->irq,
1057 omap_gpio_irq_handler,
1058 0, dev_name(bank->chip.parent), bank);
1059 if (ret)
1060 gpiochip_remove(&bank->chip);
1061
1062 if (!bank->is_mpuio)
1063 gpio += bank->width;
1064
1065 return ret;
1066}
1067
1068static void omap_gpio_init_context(struct gpio_bank *p)
1069{
1070 const struct omap_gpio_reg_offs *regs = p->regs;
1071 void __iomem *base = p->base;
1072
1073 p->context.sysconfig = readl_relaxed(base + regs->sysconfig);
1074 p->context.ctrl = readl_relaxed(base + regs->ctrl);
1075 p->context.oe = readl_relaxed(base + regs->direction);
1076 p->context.wake_en = readl_relaxed(base + regs->wkup_en);
1077 p->context.leveldetect0 = readl_relaxed(base + regs->leveldetect0);
1078 p->context.leveldetect1 = readl_relaxed(base + regs->leveldetect1);
1079 p->context.risingdetect = readl_relaxed(base + regs->risingdetect);
1080 p->context.fallingdetect = readl_relaxed(base + regs->fallingdetect);
1081 p->context.irqenable1 = readl_relaxed(base + regs->irqenable);
1082 p->context.irqenable2 = readl_relaxed(base + regs->irqenable2);
1083 p->context.dataout = readl_relaxed(base + regs->dataout);
1084
1085 p->context_valid = true;
1086}
1087
1088static void omap_gpio_restore_context(struct gpio_bank *bank)
1089{
1090 const struct omap_gpio_reg_offs *regs = bank->regs;
1091 void __iomem *base = bank->base;
1092
1093 writel_relaxed(bank->context.sysconfig, base + regs->sysconfig);
1094 writel_relaxed(bank->context.wake_en, base + regs->wkup_en);
1095 writel_relaxed(bank->context.ctrl, base + regs->ctrl);
1096 writel_relaxed(bank->context.leveldetect0, base + regs->leveldetect0);
1097 writel_relaxed(bank->context.leveldetect1, base + regs->leveldetect1);
1098 writel_relaxed(bank->context.risingdetect, base + regs->risingdetect);
1099 writel_relaxed(bank->context.fallingdetect, base + regs->fallingdetect);
1100 writel_relaxed(bank->context.dataout, base + regs->dataout);
1101 writel_relaxed(bank->context.oe, base + regs->direction);
1102
1103 if (bank->dbck_enable_mask) {
1104 writel_relaxed(bank->context.debounce, base + regs->debounce);
1105 writel_relaxed(bank->context.debounce_en,
1106 base + regs->debounce_en);
1107 }
1108
1109 writel_relaxed(bank->context.irqenable1, base + regs->irqenable);
1110 writel_relaxed(bank->context.irqenable2, base + regs->irqenable2);
1111}
1112
1113static void omap_gpio_idle(struct gpio_bank *bank, bool may_lose_context)
1114{
1115 struct device *dev = bank->chip.parent;
1116 void __iomem *base = bank->base;
1117 u32 mask, nowake;
1118
1119 bank->saved_datain = readl_relaxed(base + bank->regs->datain);
1120
1121 /* Save syconfig, it's runtime value can be different from init value */
1122 if (bank->loses_context)
1123 bank->context.sysconfig = readl_relaxed(base + bank->regs->sysconfig);
1124
1125 if (!bank->enabled_non_wakeup_gpios)
1126 goto update_gpio_context_count;
1127
1128 /* Check for pending EDGE_FALLING, ignore EDGE_BOTH */
1129 mask = bank->enabled_non_wakeup_gpios & bank->context.fallingdetect;
1130 mask &= ~bank->context.risingdetect;
1131 bank->saved_datain |= mask;
1132
1133 /* Check for pending EDGE_RISING, ignore EDGE_BOTH */
1134 mask = bank->enabled_non_wakeup_gpios & bank->context.risingdetect;
1135 mask &= ~bank->context.fallingdetect;
1136 bank->saved_datain &= ~mask;
1137
1138 if (!may_lose_context)
1139 goto update_gpio_context_count;
1140
1141 /*
1142 * If going to OFF, remove triggering for all wkup domain
1143 * non-wakeup GPIOs. Otherwise spurious IRQs will be
1144 * generated. See OMAP2420 Errata item 1.101.
1145 */
1146 if (!bank->loses_context && bank->enabled_non_wakeup_gpios) {
1147 nowake = bank->enabled_non_wakeup_gpios;
1148 omap_gpio_rmw(base + bank->regs->fallingdetect, nowake, ~nowake);
1149 omap_gpio_rmw(base + bank->regs->risingdetect, nowake, ~nowake);
1150 }
1151
1152update_gpio_context_count:
1153 if (bank->get_context_loss_count)
1154 bank->context_loss_count =
1155 bank->get_context_loss_count(dev);
1156
1157 omap_gpio_dbck_disable(bank);
1158}
1159
1160static void omap_gpio_unidle(struct gpio_bank *bank)
1161{
1162 struct device *dev = bank->chip.parent;
1163 u32 l = 0, gen, gen0, gen1;
1164 int c;
1165
1166 /*
1167 * On the first resume during the probe, the context has not
1168 * been initialised and so initialise it now. Also initialise
1169 * the context loss count.
1170 */
1171 if (bank->loses_context && !bank->context_valid) {
1172 omap_gpio_init_context(bank);
1173
1174 if (bank->get_context_loss_count)
1175 bank->context_loss_count =
1176 bank->get_context_loss_count(dev);
1177 }
1178
1179 omap_gpio_dbck_enable(bank);
1180
1181 if (bank->loses_context) {
1182 if (!bank->get_context_loss_count) {
1183 omap_gpio_restore_context(bank);
1184 } else {
1185 c = bank->get_context_loss_count(dev);
1186 if (c != bank->context_loss_count) {
1187 omap_gpio_restore_context(bank);
1188 } else {
1189 return;
1190 }
1191 }
1192 } else {
1193 /* Restore changes done for OMAP2420 errata 1.101 */
1194 writel_relaxed(bank->context.fallingdetect,
1195 bank->base + bank->regs->fallingdetect);
1196 writel_relaxed(bank->context.risingdetect,
1197 bank->base + bank->regs->risingdetect);
1198 }
1199
1200 l = readl_relaxed(bank->base + bank->regs->datain);
1201
1202 /*
1203 * Check if any of the non-wakeup interrupt GPIOs have changed
1204 * state. If so, generate an IRQ by software. This is
1205 * horribly racy, but it's the best we can do to work around
1206 * this silicon bug.
1207 */
1208 l ^= bank->saved_datain;
1209 l &= bank->enabled_non_wakeup_gpios;
1210
1211 /*
1212 * No need to generate IRQs for the rising edge for gpio IRQs
1213 * configured with falling edge only; and vice versa.
1214 */
1215 gen0 = l & bank->context.fallingdetect;
1216 gen0 &= bank->saved_datain;
1217
1218 gen1 = l & bank->context.risingdetect;
1219 gen1 &= ~(bank->saved_datain);
1220
1221 /* FIXME: Consider GPIO IRQs with level detections properly! */
1222 gen = l & (~(bank->context.fallingdetect) &
1223 ~(bank->context.risingdetect));
1224 /* Consider all GPIO IRQs needed to be updated */
1225 gen |= gen0 | gen1;
1226
1227 if (gen) {
1228 u32 old0, old1;
1229
1230 old0 = readl_relaxed(bank->base + bank->regs->leveldetect0);
1231 old1 = readl_relaxed(bank->base + bank->regs->leveldetect1);
1232
1233 if (!bank->regs->irqstatus_raw0) {
1234 writel_relaxed(old0 | gen, bank->base +
1235 bank->regs->leveldetect0);
1236 writel_relaxed(old1 | gen, bank->base +
1237 bank->regs->leveldetect1);
1238 }
1239
1240 if (bank->regs->irqstatus_raw0) {
1241 writel_relaxed(old0 | l, bank->base +
1242 bank->regs->leveldetect0);
1243 writel_relaxed(old1 | l, bank->base +
1244 bank->regs->leveldetect1);
1245 }
1246 writel_relaxed(old0, bank->base + bank->regs->leveldetect0);
1247 writel_relaxed(old1, bank->base + bank->regs->leveldetect1);
1248 }
1249}
1250
1251static int gpio_omap_cpu_notifier(struct notifier_block *nb,
1252 unsigned long cmd, void *v)
1253{
1254 struct gpio_bank *bank;
1255 unsigned long flags;
1256 int ret = NOTIFY_OK;
1257 u32 isr, mask;
1258
1259 bank = container_of(nb, struct gpio_bank, nb);
1260
1261 raw_spin_lock_irqsave(&bank->lock, flags);
1262 if (bank->is_suspended)
1263 goto out_unlock;
1264
1265 switch (cmd) {
1266 case CPU_CLUSTER_PM_ENTER:
1267 mask = omap_get_gpio_irqbank_mask(bank);
1268 isr = readl_relaxed(bank->base + bank->regs->irqstatus) & mask;
1269 if (isr) {
1270 ret = NOTIFY_BAD;
1271 break;
1272 }
1273 omap_gpio_idle(bank, true);
1274 break;
1275 case CPU_CLUSTER_PM_ENTER_FAILED:
1276 case CPU_CLUSTER_PM_EXIT:
1277 omap_gpio_unidle(bank);
1278 break;
1279 }
1280
1281out_unlock:
1282 raw_spin_unlock_irqrestore(&bank->lock, flags);
1283
1284 return ret;
1285}
1286
1287static const struct omap_gpio_reg_offs omap2_gpio_regs = {
1288 .revision = OMAP24XX_GPIO_REVISION,
1289 .sysconfig = OMAP24XX_GPIO_SYSCONFIG,
1290 .direction = OMAP24XX_GPIO_OE,
1291 .datain = OMAP24XX_GPIO_DATAIN,
1292 .dataout = OMAP24XX_GPIO_DATAOUT,
1293 .set_dataout = OMAP24XX_GPIO_SETDATAOUT,
1294 .clr_dataout = OMAP24XX_GPIO_CLEARDATAOUT,
1295 .irqstatus = OMAP24XX_GPIO_IRQSTATUS1,
1296 .irqstatus2 = OMAP24XX_GPIO_IRQSTATUS2,
1297 .irqenable = OMAP24XX_GPIO_IRQENABLE1,
1298 .irqenable2 = OMAP24XX_GPIO_IRQENABLE2,
1299 .set_irqenable = OMAP24XX_GPIO_SETIRQENABLE1,
1300 .clr_irqenable = OMAP24XX_GPIO_CLEARIRQENABLE1,
1301 .debounce = OMAP24XX_GPIO_DEBOUNCE_VAL,
1302 .debounce_en = OMAP24XX_GPIO_DEBOUNCE_EN,
1303 .ctrl = OMAP24XX_GPIO_CTRL,
1304 .wkup_en = OMAP24XX_GPIO_WAKE_EN,
1305 .leveldetect0 = OMAP24XX_GPIO_LEVELDETECT0,
1306 .leveldetect1 = OMAP24XX_GPIO_LEVELDETECT1,
1307 .risingdetect = OMAP24XX_GPIO_RISINGDETECT,
1308 .fallingdetect = OMAP24XX_GPIO_FALLINGDETECT,
1309};
1310
1311static const struct omap_gpio_reg_offs omap4_gpio_regs = {
1312 .revision = OMAP4_GPIO_REVISION,
1313 .sysconfig = OMAP4_GPIO_SYSCONFIG,
1314 .direction = OMAP4_GPIO_OE,
1315 .datain = OMAP4_GPIO_DATAIN,
1316 .dataout = OMAP4_GPIO_DATAOUT,
1317 .set_dataout = OMAP4_GPIO_SETDATAOUT,
1318 .clr_dataout = OMAP4_GPIO_CLEARDATAOUT,
1319 .irqstatus = OMAP4_GPIO_IRQSTATUS0,
1320 .irqstatus2 = OMAP4_GPIO_IRQSTATUS1,
1321 .irqstatus_raw0 = OMAP4_GPIO_IRQSTATUSRAW0,
1322 .irqstatus_raw1 = OMAP4_GPIO_IRQSTATUSRAW1,
1323 .irqenable = OMAP4_GPIO_IRQSTATUSSET0,
1324 .irqenable2 = OMAP4_GPIO_IRQSTATUSSET1,
1325 .set_irqenable = OMAP4_GPIO_IRQSTATUSSET0,
1326 .clr_irqenable = OMAP4_GPIO_IRQSTATUSCLR0,
1327 .debounce = OMAP4_GPIO_DEBOUNCINGTIME,
1328 .debounce_en = OMAP4_GPIO_DEBOUNCENABLE,
1329 .ctrl = OMAP4_GPIO_CTRL,
1330 .wkup_en = OMAP4_GPIO_IRQWAKEN0,
1331 .leveldetect0 = OMAP4_GPIO_LEVELDETECT0,
1332 .leveldetect1 = OMAP4_GPIO_LEVELDETECT1,
1333 .risingdetect = OMAP4_GPIO_RISINGDETECT,
1334 .fallingdetect = OMAP4_GPIO_FALLINGDETECT,
1335};
1336
1337static const struct omap_gpio_platform_data omap2_pdata = {
1338 .regs = &omap2_gpio_regs,
1339 .bank_width = 32,
1340 .dbck_flag = false,
1341};
1342
1343static const struct omap_gpio_platform_data omap3_pdata = {
1344 .regs = &omap2_gpio_regs,
1345 .bank_width = 32,
1346 .dbck_flag = true,
1347};
1348
1349static const struct omap_gpio_platform_data omap4_pdata = {
1350 .regs = &omap4_gpio_regs,
1351 .bank_width = 32,
1352 .dbck_flag = true,
1353};
1354
1355static const struct of_device_id omap_gpio_match[] = {
1356 {
1357 .compatible = "ti,omap4-gpio",
1358 .data = &omap4_pdata,
1359 },
1360 {
1361 .compatible = "ti,omap3-gpio",
1362 .data = &omap3_pdata,
1363 },
1364 {
1365 .compatible = "ti,omap2-gpio",
1366 .data = &omap2_pdata,
1367 },
1368 { },
1369};
1370MODULE_DEVICE_TABLE(of, omap_gpio_match);
1371
1372static int omap_gpio_probe(struct platform_device *pdev)
1373{
1374 struct device *dev = &pdev->dev;
1375 struct device_node *node = dev->of_node;
1376 const struct omap_gpio_platform_data *pdata;
1377 struct gpio_bank *bank;
1378 struct irq_chip *irqc;
1379 int ret;
1380
1381 pdata = device_get_match_data(dev);
1382
1383 pdata = pdata ?: dev_get_platdata(dev);
1384 if (!pdata)
1385 return -EINVAL;
1386
1387 bank = devm_kzalloc(dev, sizeof(*bank), GFP_KERNEL);
1388 if (!bank)
1389 return -ENOMEM;
1390
1391 irqc = devm_kzalloc(dev, sizeof(*irqc), GFP_KERNEL);
1392 if (!irqc)
1393 return -ENOMEM;
1394
1395 irqc->irq_startup = omap_gpio_irq_startup,
1396 irqc->irq_shutdown = omap_gpio_irq_shutdown,
1397 irqc->irq_ack = dummy_irq_chip.irq_ack,
1398 irqc->irq_mask = omap_gpio_mask_irq,
1399 irqc->irq_unmask = omap_gpio_unmask_irq,
1400 irqc->irq_set_type = omap_gpio_irq_type,
1401 irqc->irq_set_wake = omap_gpio_wake_enable,
1402 irqc->irq_bus_lock = omap_gpio_irq_bus_lock,
1403 irqc->irq_bus_sync_unlock = gpio_irq_bus_sync_unlock,
1404 irqc->name = dev_name(&pdev->dev);
1405 irqc->flags = IRQCHIP_MASK_ON_SUSPEND;
1406 irqc->parent_device = dev;
1407
1408 bank->irq = platform_get_irq(pdev, 0);
1409 if (bank->irq <= 0) {
1410 if (!bank->irq)
1411 bank->irq = -ENXIO;
1412 return dev_err_probe(dev, bank->irq, "can't get irq resource\n");
1413 }
1414
1415 bank->chip.parent = dev;
1416 bank->chip.owner = THIS_MODULE;
1417 bank->dbck_flag = pdata->dbck_flag;
1418 bank->stride = pdata->bank_stride;
1419 bank->width = pdata->bank_width;
1420 bank->is_mpuio = pdata->is_mpuio;
1421 bank->non_wakeup_gpios = pdata->non_wakeup_gpios;
1422 bank->regs = pdata->regs;
1423#ifdef CONFIG_OF_GPIO
1424 bank->chip.of_node = of_node_get(node);
1425#endif
1426
1427 if (node) {
1428 if (!of_property_read_bool(node, "ti,gpio-always-on"))
1429 bank->loses_context = true;
1430 } else {
1431 bank->loses_context = pdata->loses_context;
1432
1433 if (bank->loses_context)
1434 bank->get_context_loss_count =
1435 pdata->get_context_loss_count;
1436 }
1437
1438 if (bank->regs->set_dataout && bank->regs->clr_dataout)
1439 bank->set_dataout = omap_set_gpio_dataout_reg;
1440 else
1441 bank->set_dataout = omap_set_gpio_dataout_mask;
1442
1443 raw_spin_lock_init(&bank->lock);
1444 raw_spin_lock_init(&bank->wa_lock);
1445
1446 /* Static mapping, never released */
1447 bank->base = devm_platform_ioremap_resource(pdev, 0);
1448 if (IS_ERR(bank->base)) {
1449 return PTR_ERR(bank->base);
1450 }
1451
1452 if (bank->dbck_flag) {
1453 bank->dbck = devm_clk_get(dev, "dbclk");
1454 if (IS_ERR(bank->dbck)) {
1455 dev_err(dev,
1456 "Could not get gpio dbck. Disable debounce\n");
1457 bank->dbck_flag = false;
1458 } else {
1459 clk_prepare(bank->dbck);
1460 }
1461 }
1462
1463 platform_set_drvdata(pdev, bank);
1464
1465 pm_runtime_enable(dev);
1466 pm_runtime_get_sync(dev);
1467
1468 if (bank->is_mpuio)
1469 omap_mpuio_init(bank);
1470
1471 omap_gpio_mod_init(bank);
1472
1473 ret = omap_gpio_chip_init(bank, irqc);
1474 if (ret) {
1475 pm_runtime_put_sync(dev);
1476 pm_runtime_disable(dev);
1477 if (bank->dbck_flag)
1478 clk_unprepare(bank->dbck);
1479 return ret;
1480 }
1481
1482 omap_gpio_show_rev(bank);
1483
1484 bank->nb.notifier_call = gpio_omap_cpu_notifier;
1485 cpu_pm_register_notifier(&bank->nb);
1486
1487 pm_runtime_put(dev);
1488
1489 return 0;
1490}
1491
1492static int omap_gpio_remove(struct platform_device *pdev)
1493{
1494 struct gpio_bank *bank = platform_get_drvdata(pdev);
1495
1496 cpu_pm_unregister_notifier(&bank->nb);
1497 gpiochip_remove(&bank->chip);
1498 pm_runtime_disable(&pdev->dev);
1499 if (bank->dbck_flag)
1500 clk_unprepare(bank->dbck);
1501
1502 return 0;
1503}
1504
1505static int __maybe_unused omap_gpio_runtime_suspend(struct device *dev)
1506{
1507 struct gpio_bank *bank = dev_get_drvdata(dev);
1508 unsigned long flags;
1509
1510 raw_spin_lock_irqsave(&bank->lock, flags);
1511 omap_gpio_idle(bank, true);
1512 bank->is_suspended = true;
1513 raw_spin_unlock_irqrestore(&bank->lock, flags);
1514
1515 return 0;
1516}
1517
1518static int __maybe_unused omap_gpio_runtime_resume(struct device *dev)
1519{
1520 struct gpio_bank *bank = dev_get_drvdata(dev);
1521 unsigned long flags;
1522
1523 raw_spin_lock_irqsave(&bank->lock, flags);
1524 omap_gpio_unidle(bank);
1525 bank->is_suspended = false;
1526 raw_spin_unlock_irqrestore(&bank->lock, flags);
1527
1528 return 0;
1529}
1530
1531static int __maybe_unused omap_gpio_suspend(struct device *dev)
1532{
1533 struct gpio_bank *bank = dev_get_drvdata(dev);
1534
1535 if (bank->is_suspended)
1536 return 0;
1537
1538 bank->needs_resume = 1;
1539
1540 return omap_gpio_runtime_suspend(dev);
1541}
1542
1543static int __maybe_unused omap_gpio_resume(struct device *dev)
1544{
1545 struct gpio_bank *bank = dev_get_drvdata(dev);
1546
1547 if (!bank->needs_resume)
1548 return 0;
1549
1550 bank->needs_resume = 0;
1551
1552 return omap_gpio_runtime_resume(dev);
1553}
1554
1555static const struct dev_pm_ops gpio_pm_ops = {
1556 SET_RUNTIME_PM_OPS(omap_gpio_runtime_suspend, omap_gpio_runtime_resume,
1557 NULL)
1558 SET_LATE_SYSTEM_SLEEP_PM_OPS(omap_gpio_suspend, omap_gpio_resume)
1559};
1560
1561static struct platform_driver omap_gpio_driver = {
1562 .probe = omap_gpio_probe,
1563 .remove = omap_gpio_remove,
1564 .driver = {
1565 .name = "omap_gpio",
1566 .pm = &gpio_pm_ops,
1567 .of_match_table = omap_gpio_match,
1568 },
1569};
1570
1571/*
1572 * gpio driver register needs to be done before
1573 * machine_init functions access gpio APIs.
1574 * Hence omap_gpio_drv_reg() is a postcore_initcall.
1575 */
1576static int __init omap_gpio_drv_reg(void)
1577{
1578 return platform_driver_register(&omap_gpio_driver);
1579}
1580postcore_initcall(omap_gpio_drv_reg);
1581
1582static void __exit omap_gpio_exit(void)
1583{
1584 platform_driver_unregister(&omap_gpio_driver);
1585}
1586module_exit(omap_gpio_exit);
1587
1588MODULE_DESCRIPTION("omap gpio driver");
1589MODULE_ALIAS("platform:gpio-omap");
1590MODULE_LICENSE("GPL v2");