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