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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
29#include <mach/hardware.h>
30#include <asm/irq.h>
31#include <mach/irqs.h>
32#include <asm/gpio.h>
33#include <asm/mach/irq.h>
34
35#define OFF_MODE 1
36
37static LIST_HEAD(omap_gpio_list);
38
39struct gpio_regs {
40 u32 irqenable1;
41 u32 irqenable2;
42 u32 wake_en;
43 u32 ctrl;
44 u32 oe;
45 u32 leveldetect0;
46 u32 leveldetect1;
47 u32 risingdetect;
48 u32 fallingdetect;
49 u32 dataout;
50 u32 debounce;
51 u32 debounce_en;
52};
53
54struct gpio_bank {
55 struct list_head node;
56 void __iomem *base;
57 u16 irq;
58 int irq_base;
59 struct irq_domain *domain;
60 u32 non_wakeup_gpios;
61 u32 enabled_non_wakeup_gpios;
62 struct gpio_regs context;
63 u32 saved_datain;
64 u32 level_mask;
65 u32 toggle_mask;
66 spinlock_t lock;
67 struct gpio_chip chip;
68 struct clk *dbck;
69 u32 mod_usage;
70 u32 dbck_enable_mask;
71 bool dbck_enabled;
72 struct device *dev;
73 bool is_mpuio;
74 bool dbck_flag;
75 bool loses_context;
76 int stride;
77 u32 width;
78 int context_loss_count;
79 int power_mode;
80 bool workaround_enabled;
81
82 void (*set_dataout)(struct gpio_bank *bank, int gpio, int enable);
83 int (*get_context_loss_count)(struct device *dev);
84
85 struct omap_gpio_reg_offs *regs;
86};
87
88#define GPIO_INDEX(bank, gpio) (gpio % bank->width)
89#define GPIO_BIT(bank, gpio) (1 << GPIO_INDEX(bank, gpio))
90#define GPIO_MOD_CTRL_BIT BIT(0)
91
92static int irq_to_gpio(struct gpio_bank *bank, unsigned int gpio_irq)
93{
94 return gpio_irq - bank->irq_base + bank->chip.base;
95}
96
97static void _set_gpio_direction(struct gpio_bank *bank, int gpio, int is_input)
98{
99 void __iomem *reg = bank->base;
100 u32 l;
101
102 reg += bank->regs->direction;
103 l = __raw_readl(reg);
104 if (is_input)
105 l |= 1 << gpio;
106 else
107 l &= ~(1 << gpio);
108 __raw_writel(l, reg);
109 bank->context.oe = l;
110}
111
112
113/* set data out value using dedicate set/clear register */
114static void _set_gpio_dataout_reg(struct gpio_bank *bank, int gpio, int enable)
115{
116 void __iomem *reg = bank->base;
117 u32 l = GPIO_BIT(bank, gpio);
118
119 if (enable) {
120 reg += bank->regs->set_dataout;
121 bank->context.dataout |= l;
122 } else {
123 reg += bank->regs->clr_dataout;
124 bank->context.dataout &= ~l;
125 }
126
127 __raw_writel(l, reg);
128}
129
130/* set data out value using mask register */
131static void _set_gpio_dataout_mask(struct gpio_bank *bank, int gpio, int enable)
132{
133 void __iomem *reg = bank->base + bank->regs->dataout;
134 u32 gpio_bit = GPIO_BIT(bank, gpio);
135 u32 l;
136
137 l = __raw_readl(reg);
138 if (enable)
139 l |= gpio_bit;
140 else
141 l &= ~gpio_bit;
142 __raw_writel(l, reg);
143 bank->context.dataout = l;
144}
145
146static int _get_gpio_datain(struct gpio_bank *bank, int offset)
147{
148 void __iomem *reg = bank->base + bank->regs->datain;
149
150 return (__raw_readl(reg) & (1 << offset)) != 0;
151}
152
153static int _get_gpio_dataout(struct gpio_bank *bank, int offset)
154{
155 void __iomem *reg = bank->base + bank->regs->dataout;
156
157 return (__raw_readl(reg) & (1 << offset)) != 0;
158}
159
160static inline void _gpio_rmw(void __iomem *base, u32 reg, u32 mask, bool set)
161{
162 int l = __raw_readl(base + reg);
163
164 if (set)
165 l |= mask;
166 else
167 l &= ~mask;
168
169 __raw_writel(l, base + reg);
170}
171
172static inline void _gpio_dbck_enable(struct gpio_bank *bank)
173{
174 if (bank->dbck_enable_mask && !bank->dbck_enabled) {
175 clk_enable(bank->dbck);
176 bank->dbck_enabled = true;
177
178 __raw_writel(bank->dbck_enable_mask,
179 bank->base + bank->regs->debounce_en);
180 }
181}
182
183static inline void _gpio_dbck_disable(struct gpio_bank *bank)
184{
185 if (bank->dbck_enable_mask && bank->dbck_enabled) {
186 /*
187 * Disable debounce before cutting it's clock. If debounce is
188 * enabled but the clock is not, GPIO module seems to be unable
189 * to detect events and generate interrupts at least on OMAP3.
190 */
191 __raw_writel(0, bank->base + bank->regs->debounce_en);
192
193 clk_disable(bank->dbck);
194 bank->dbck_enabled = false;
195 }
196}
197
198/**
199 * _set_gpio_debounce - low level gpio debounce time
200 * @bank: the gpio bank we're acting upon
201 * @gpio: the gpio number on this @gpio
202 * @debounce: debounce time to use
203 *
204 * OMAP's debounce time is in 31us steps so we need
205 * to convert and round up to the closest unit.
206 */
207static void _set_gpio_debounce(struct gpio_bank *bank, unsigned gpio,
208 unsigned debounce)
209{
210 void __iomem *reg;
211 u32 val;
212 u32 l;
213
214 if (!bank->dbck_flag)
215 return;
216
217 if (debounce < 32)
218 debounce = 0x01;
219 else if (debounce > 7936)
220 debounce = 0xff;
221 else
222 debounce = (debounce / 0x1f) - 1;
223
224 l = GPIO_BIT(bank, gpio);
225
226 clk_enable(bank->dbck);
227 reg = bank->base + bank->regs->debounce;
228 __raw_writel(debounce, reg);
229
230 reg = bank->base + bank->regs->debounce_en;
231 val = __raw_readl(reg);
232
233 if (debounce)
234 val |= l;
235 else
236 val &= ~l;
237 bank->dbck_enable_mask = val;
238
239 __raw_writel(val, reg);
240 clk_disable(bank->dbck);
241 /*
242 * Enable debounce clock per module.
243 * This call is mandatory because in omap_gpio_request() when
244 * *_runtime_get_sync() is called, _gpio_dbck_enable() within
245 * runtime callbck fails to turn on dbck because dbck_enable_mask
246 * used within _gpio_dbck_enable() is still not initialized at
247 * that point. Therefore we have to enable dbck here.
248 */
249 _gpio_dbck_enable(bank);
250 if (bank->dbck_enable_mask) {
251 bank->context.debounce = debounce;
252 bank->context.debounce_en = val;
253 }
254}
255
256static inline void set_gpio_trigger(struct gpio_bank *bank, int gpio,
257 unsigned trigger)
258{
259 void __iomem *base = bank->base;
260 u32 gpio_bit = 1 << gpio;
261
262 _gpio_rmw(base, bank->regs->leveldetect0, gpio_bit,
263 trigger & IRQ_TYPE_LEVEL_LOW);
264 _gpio_rmw(base, bank->regs->leveldetect1, gpio_bit,
265 trigger & IRQ_TYPE_LEVEL_HIGH);
266 _gpio_rmw(base, bank->regs->risingdetect, gpio_bit,
267 trigger & IRQ_TYPE_EDGE_RISING);
268 _gpio_rmw(base, bank->regs->fallingdetect, gpio_bit,
269 trigger & IRQ_TYPE_EDGE_FALLING);
270
271 bank->context.leveldetect0 =
272 __raw_readl(bank->base + bank->regs->leveldetect0);
273 bank->context.leveldetect1 =
274 __raw_readl(bank->base + bank->regs->leveldetect1);
275 bank->context.risingdetect =
276 __raw_readl(bank->base + bank->regs->risingdetect);
277 bank->context.fallingdetect =
278 __raw_readl(bank->base + bank->regs->fallingdetect);
279
280 if (likely(!(bank->non_wakeup_gpios & gpio_bit))) {
281 _gpio_rmw(base, bank->regs->wkup_en, gpio_bit, trigger != 0);
282 bank->context.wake_en =
283 __raw_readl(bank->base + bank->regs->wkup_en);
284 }
285
286 /* This part needs to be executed always for OMAP{34xx, 44xx} */
287 if (!bank->regs->irqctrl) {
288 /* On omap24xx proceed only when valid GPIO bit is set */
289 if (bank->non_wakeup_gpios) {
290 if (!(bank->non_wakeup_gpios & gpio_bit))
291 goto exit;
292 }
293
294 /*
295 * Log the edge gpio and manually trigger the IRQ
296 * after resume if the input level changes
297 * to avoid irq lost during PER RET/OFF mode
298 * Applies for omap2 non-wakeup gpio and all omap3 gpios
299 */
300 if (trigger & IRQ_TYPE_EDGE_BOTH)
301 bank->enabled_non_wakeup_gpios |= gpio_bit;
302 else
303 bank->enabled_non_wakeup_gpios &= ~gpio_bit;
304 }
305
306exit:
307 bank->level_mask =
308 __raw_readl(bank->base + bank->regs->leveldetect0) |
309 __raw_readl(bank->base + bank->regs->leveldetect1);
310}
311
312#ifdef CONFIG_ARCH_OMAP1
313/*
314 * This only applies to chips that can't do both rising and falling edge
315 * detection at once. For all other chips, this function is a noop.
316 */
317static void _toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio)
318{
319 void __iomem *reg = bank->base;
320 u32 l = 0;
321
322 if (!bank->regs->irqctrl)
323 return;
324
325 reg += bank->regs->irqctrl;
326
327 l = __raw_readl(reg);
328 if ((l >> gpio) & 1)
329 l &= ~(1 << gpio);
330 else
331 l |= 1 << gpio;
332
333 __raw_writel(l, reg);
334}
335#else
336static void _toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio) {}
337#endif
338
339static int _set_gpio_triggering(struct gpio_bank *bank, int gpio,
340 unsigned trigger)
341{
342 void __iomem *reg = bank->base;
343 void __iomem *base = bank->base;
344 u32 l = 0;
345
346 if (bank->regs->leveldetect0 && bank->regs->wkup_en) {
347 set_gpio_trigger(bank, gpio, trigger);
348 } else if (bank->regs->irqctrl) {
349 reg += bank->regs->irqctrl;
350
351 l = __raw_readl(reg);
352 if ((trigger & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH)
353 bank->toggle_mask |= 1 << gpio;
354 if (trigger & IRQ_TYPE_EDGE_RISING)
355 l |= 1 << gpio;
356 else if (trigger & IRQ_TYPE_EDGE_FALLING)
357 l &= ~(1 << gpio);
358 else
359 return -EINVAL;
360
361 __raw_writel(l, reg);
362 } else if (bank->regs->edgectrl1) {
363 if (gpio & 0x08)
364 reg += bank->regs->edgectrl2;
365 else
366 reg += bank->regs->edgectrl1;
367
368 gpio &= 0x07;
369 l = __raw_readl(reg);
370 l &= ~(3 << (gpio << 1));
371 if (trigger & IRQ_TYPE_EDGE_RISING)
372 l |= 2 << (gpio << 1);
373 if (trigger & IRQ_TYPE_EDGE_FALLING)
374 l |= 1 << (gpio << 1);
375
376 /* Enable wake-up during idle for dynamic tick */
377 _gpio_rmw(base, bank->regs->wkup_en, 1 << gpio, trigger);
378 bank->context.wake_en =
379 __raw_readl(bank->base + bank->regs->wkup_en);
380 __raw_writel(l, reg);
381 }
382 return 0;
383}
384
385static int gpio_irq_type(struct irq_data *d, unsigned type)
386{
387 struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
388 unsigned gpio;
389 int retval;
390 unsigned long flags;
391
392 if (!cpu_class_is_omap2() && d->irq > IH_MPUIO_BASE)
393 gpio = OMAP_MPUIO(d->irq - IH_MPUIO_BASE);
394 else
395 gpio = irq_to_gpio(bank, d->irq);
396
397 if (type & ~IRQ_TYPE_SENSE_MASK)
398 return -EINVAL;
399
400 if (!bank->regs->leveldetect0 &&
401 (type & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH)))
402 return -EINVAL;
403
404 spin_lock_irqsave(&bank->lock, flags);
405 retval = _set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), type);
406 spin_unlock_irqrestore(&bank->lock, flags);
407
408 if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
409 __irq_set_handler_locked(d->irq, handle_level_irq);
410 else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
411 __irq_set_handler_locked(d->irq, handle_edge_irq);
412
413 return retval;
414}
415
416static void _clear_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
417{
418 void __iomem *reg = bank->base;
419
420 reg += bank->regs->irqstatus;
421 __raw_writel(gpio_mask, reg);
422
423 /* Workaround for clearing DSP GPIO interrupts to allow retention */
424 if (bank->regs->irqstatus2) {
425 reg = bank->base + bank->regs->irqstatus2;
426 __raw_writel(gpio_mask, reg);
427 }
428
429 /* Flush posted write for the irq status to avoid spurious interrupts */
430 __raw_readl(reg);
431}
432
433static inline void _clear_gpio_irqstatus(struct gpio_bank *bank, int gpio)
434{
435 _clear_gpio_irqbank(bank, GPIO_BIT(bank, gpio));
436}
437
438static u32 _get_gpio_irqbank_mask(struct gpio_bank *bank)
439{
440 void __iomem *reg = bank->base;
441 u32 l;
442 u32 mask = (1 << bank->width) - 1;
443
444 reg += bank->regs->irqenable;
445 l = __raw_readl(reg);
446 if (bank->regs->irqenable_inv)
447 l = ~l;
448 l &= mask;
449 return l;
450}
451
452static void _enable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
453{
454 void __iomem *reg = bank->base;
455 u32 l;
456
457 if (bank->regs->set_irqenable) {
458 reg += bank->regs->set_irqenable;
459 l = gpio_mask;
460 bank->context.irqenable1 |= gpio_mask;
461 } else {
462 reg += bank->regs->irqenable;
463 l = __raw_readl(reg);
464 if (bank->regs->irqenable_inv)
465 l &= ~gpio_mask;
466 else
467 l |= gpio_mask;
468 bank->context.irqenable1 = l;
469 }
470
471 __raw_writel(l, reg);
472}
473
474static void _disable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
475{
476 void __iomem *reg = bank->base;
477 u32 l;
478
479 if (bank->regs->clr_irqenable) {
480 reg += bank->regs->clr_irqenable;
481 l = gpio_mask;
482 bank->context.irqenable1 &= ~gpio_mask;
483 } else {
484 reg += bank->regs->irqenable;
485 l = __raw_readl(reg);
486 if (bank->regs->irqenable_inv)
487 l |= gpio_mask;
488 else
489 l &= ~gpio_mask;
490 bank->context.irqenable1 = l;
491 }
492
493 __raw_writel(l, reg);
494}
495
496static inline void _set_gpio_irqenable(struct gpio_bank *bank, int gpio, int enable)
497{
498 if (enable)
499 _enable_gpio_irqbank(bank, GPIO_BIT(bank, gpio));
500 else
501 _disable_gpio_irqbank(bank, GPIO_BIT(bank, gpio));
502}
503
504/*
505 * Note that ENAWAKEUP needs to be enabled in GPIO_SYSCONFIG register.
506 * 1510 does not seem to have a wake-up register. If JTAG is connected
507 * to the target, system will wake up always on GPIO events. While
508 * system is running all registered GPIO interrupts need to have wake-up
509 * enabled. When system is suspended, only selected GPIO interrupts need
510 * to have wake-up enabled.
511 */
512static int _set_gpio_wakeup(struct gpio_bank *bank, int gpio, int enable)
513{
514 u32 gpio_bit = GPIO_BIT(bank, gpio);
515 unsigned long flags;
516
517 if (bank->non_wakeup_gpios & gpio_bit) {
518 dev_err(bank->dev,
519 "Unable to modify wakeup on non-wakeup GPIO%d\n", gpio);
520 return -EINVAL;
521 }
522
523 spin_lock_irqsave(&bank->lock, flags);
524 if (enable)
525 bank->context.wake_en |= gpio_bit;
526 else
527 bank->context.wake_en &= ~gpio_bit;
528
529 __raw_writel(bank->context.wake_en, bank->base + bank->regs->wkup_en);
530 spin_unlock_irqrestore(&bank->lock, flags);
531
532 return 0;
533}
534
535static void _reset_gpio(struct gpio_bank *bank, int gpio)
536{
537 _set_gpio_direction(bank, GPIO_INDEX(bank, gpio), 1);
538 _set_gpio_irqenable(bank, gpio, 0);
539 _clear_gpio_irqstatus(bank, gpio);
540 _set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), IRQ_TYPE_NONE);
541}
542
543/* Use disable_irq_wake() and enable_irq_wake() functions from drivers */
544static int gpio_wake_enable(struct irq_data *d, unsigned int enable)
545{
546 struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
547 unsigned int gpio = irq_to_gpio(bank, d->irq);
548
549 return _set_gpio_wakeup(bank, gpio, enable);
550}
551
552static int omap_gpio_request(struct gpio_chip *chip, unsigned offset)
553{
554 struct gpio_bank *bank = container_of(chip, struct gpio_bank, chip);
555 unsigned long flags;
556
557 /*
558 * If this is the first gpio_request for the bank,
559 * enable the bank module.
560 */
561 if (!bank->mod_usage)
562 pm_runtime_get_sync(bank->dev);
563
564 spin_lock_irqsave(&bank->lock, flags);
565 /* Set trigger to none. You need to enable the desired trigger with
566 * request_irq() or set_irq_type().
567 */
568 _set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);
569
570 if (bank->regs->pinctrl) {
571 void __iomem *reg = bank->base + bank->regs->pinctrl;
572
573 /* Claim the pin for MPU */
574 __raw_writel(__raw_readl(reg) | (1 << offset), reg);
575 }
576
577 if (bank->regs->ctrl && !bank->mod_usage) {
578 void __iomem *reg = bank->base + bank->regs->ctrl;
579 u32 ctrl;
580
581 ctrl = __raw_readl(reg);
582 /* Module is enabled, clocks are not gated */
583 ctrl &= ~GPIO_MOD_CTRL_BIT;
584 __raw_writel(ctrl, reg);
585 bank->context.ctrl = ctrl;
586 }
587
588 bank->mod_usage |= 1 << offset;
589
590 spin_unlock_irqrestore(&bank->lock, flags);
591
592 return 0;
593}
594
595static void omap_gpio_free(struct gpio_chip *chip, unsigned offset)
596{
597 struct gpio_bank *bank = container_of(chip, struct gpio_bank, chip);
598 void __iomem *base = bank->base;
599 unsigned long flags;
600
601 spin_lock_irqsave(&bank->lock, flags);
602
603 if (bank->regs->wkup_en) {
604 /* Disable wake-up during idle for dynamic tick */
605 _gpio_rmw(base, bank->regs->wkup_en, 1 << offset, 0);
606 bank->context.wake_en =
607 __raw_readl(bank->base + bank->regs->wkup_en);
608 }
609
610 bank->mod_usage &= ~(1 << offset);
611
612 if (bank->regs->ctrl && !bank->mod_usage) {
613 void __iomem *reg = bank->base + bank->regs->ctrl;
614 u32 ctrl;
615
616 ctrl = __raw_readl(reg);
617 /* Module is disabled, clocks are gated */
618 ctrl |= GPIO_MOD_CTRL_BIT;
619 __raw_writel(ctrl, reg);
620 bank->context.ctrl = ctrl;
621 }
622
623 _reset_gpio(bank, bank->chip.base + offset);
624 spin_unlock_irqrestore(&bank->lock, flags);
625
626 /*
627 * If this is the last gpio to be freed in the bank,
628 * disable the bank module.
629 */
630 if (!bank->mod_usage)
631 pm_runtime_put(bank->dev);
632}
633
634/*
635 * We need to unmask the GPIO bank interrupt as soon as possible to
636 * avoid missing GPIO interrupts for other lines in the bank.
637 * Then we need to mask-read-clear-unmask the triggered GPIO lines
638 * in the bank to avoid missing nested interrupts for a GPIO line.
639 * If we wait to unmask individual GPIO lines in the bank after the
640 * line's interrupt handler has been run, we may miss some nested
641 * interrupts.
642 */
643static void gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
644{
645 void __iomem *isr_reg = NULL;
646 u32 isr;
647 unsigned int gpio_irq, gpio_index;
648 struct gpio_bank *bank;
649 int unmasked = 0;
650 struct irq_chip *chip = irq_desc_get_chip(desc);
651
652 chained_irq_enter(chip, desc);
653
654 bank = irq_get_handler_data(irq);
655 isr_reg = bank->base + bank->regs->irqstatus;
656 pm_runtime_get_sync(bank->dev);
657
658 if (WARN_ON(!isr_reg))
659 goto exit;
660
661 while(1) {
662 u32 isr_saved, level_mask = 0;
663 u32 enabled;
664
665 enabled = _get_gpio_irqbank_mask(bank);
666 isr_saved = isr = __raw_readl(isr_reg) & enabled;
667
668 if (bank->level_mask)
669 level_mask = bank->level_mask & enabled;
670
671 /* clear edge sensitive interrupts before handler(s) are
672 called so that we don't miss any interrupt occurred while
673 executing them */
674 _disable_gpio_irqbank(bank, isr_saved & ~level_mask);
675 _clear_gpio_irqbank(bank, isr_saved & ~level_mask);
676 _enable_gpio_irqbank(bank, isr_saved & ~level_mask);
677
678 /* if there is only edge sensitive GPIO pin interrupts
679 configured, we could unmask GPIO bank interrupt immediately */
680 if (!level_mask && !unmasked) {
681 unmasked = 1;
682 chained_irq_exit(chip, desc);
683 }
684
685 if (!isr)
686 break;
687
688 gpio_irq = bank->irq_base;
689 for (; isr != 0; isr >>= 1, gpio_irq++) {
690 int gpio = irq_to_gpio(bank, gpio_irq);
691
692 if (!(isr & 1))
693 continue;
694
695 gpio_index = GPIO_INDEX(bank, gpio);
696
697 /*
698 * Some chips can't respond to both rising and falling
699 * at the same time. If this irq was requested with
700 * both flags, we need to flip the ICR data for the IRQ
701 * to respond to the IRQ for the opposite direction.
702 * This will be indicated in the bank toggle_mask.
703 */
704 if (bank->toggle_mask & (1 << gpio_index))
705 _toggle_gpio_edge_triggering(bank, gpio_index);
706
707 generic_handle_irq(gpio_irq);
708 }
709 }
710 /* if bank has any level sensitive GPIO pin interrupt
711 configured, we must unmask the bank interrupt only after
712 handler(s) are executed in order to avoid spurious bank
713 interrupt */
714exit:
715 if (!unmasked)
716 chained_irq_exit(chip, desc);
717 pm_runtime_put(bank->dev);
718}
719
720static void gpio_irq_shutdown(struct irq_data *d)
721{
722 struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
723 unsigned int gpio = irq_to_gpio(bank, d->irq);
724 unsigned long flags;
725
726 spin_lock_irqsave(&bank->lock, flags);
727 _reset_gpio(bank, gpio);
728 spin_unlock_irqrestore(&bank->lock, flags);
729}
730
731static void gpio_ack_irq(struct irq_data *d)
732{
733 struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
734 unsigned int gpio = irq_to_gpio(bank, d->irq);
735
736 _clear_gpio_irqstatus(bank, gpio);
737}
738
739static void gpio_mask_irq(struct irq_data *d)
740{
741 struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
742 unsigned int gpio = irq_to_gpio(bank, d->irq);
743 unsigned long flags;
744
745 spin_lock_irqsave(&bank->lock, flags);
746 _set_gpio_irqenable(bank, gpio, 0);
747 _set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), IRQ_TYPE_NONE);
748 spin_unlock_irqrestore(&bank->lock, flags);
749}
750
751static void gpio_unmask_irq(struct irq_data *d)
752{
753 struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
754 unsigned int gpio = irq_to_gpio(bank, d->irq);
755 unsigned int irq_mask = GPIO_BIT(bank, gpio);
756 u32 trigger = irqd_get_trigger_type(d);
757 unsigned long flags;
758
759 spin_lock_irqsave(&bank->lock, flags);
760 if (trigger)
761 _set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), trigger);
762
763 /* For level-triggered GPIOs, the clearing must be done after
764 * the HW source is cleared, thus after the handler has run */
765 if (bank->level_mask & irq_mask) {
766 _set_gpio_irqenable(bank, gpio, 0);
767 _clear_gpio_irqstatus(bank, gpio);
768 }
769
770 _set_gpio_irqenable(bank, gpio, 1);
771 spin_unlock_irqrestore(&bank->lock, flags);
772}
773
774static struct irq_chip gpio_irq_chip = {
775 .name = "GPIO",
776 .irq_shutdown = gpio_irq_shutdown,
777 .irq_ack = gpio_ack_irq,
778 .irq_mask = gpio_mask_irq,
779 .irq_unmask = gpio_unmask_irq,
780 .irq_set_type = gpio_irq_type,
781 .irq_set_wake = gpio_wake_enable,
782};
783
784/*---------------------------------------------------------------------*/
785
786static int omap_mpuio_suspend_noirq(struct device *dev)
787{
788 struct platform_device *pdev = to_platform_device(dev);
789 struct gpio_bank *bank = platform_get_drvdata(pdev);
790 void __iomem *mask_reg = bank->base +
791 OMAP_MPUIO_GPIO_MASKIT / bank->stride;
792 unsigned long flags;
793
794 spin_lock_irqsave(&bank->lock, flags);
795 __raw_writel(0xffff & ~bank->context.wake_en, mask_reg);
796 spin_unlock_irqrestore(&bank->lock, flags);
797
798 return 0;
799}
800
801static int omap_mpuio_resume_noirq(struct device *dev)
802{
803 struct platform_device *pdev = to_platform_device(dev);
804 struct gpio_bank *bank = platform_get_drvdata(pdev);
805 void __iomem *mask_reg = bank->base +
806 OMAP_MPUIO_GPIO_MASKIT / bank->stride;
807 unsigned long flags;
808
809 spin_lock_irqsave(&bank->lock, flags);
810 __raw_writel(bank->context.wake_en, mask_reg);
811 spin_unlock_irqrestore(&bank->lock, flags);
812
813 return 0;
814}
815
816static const struct dev_pm_ops omap_mpuio_dev_pm_ops = {
817 .suspend_noirq = omap_mpuio_suspend_noirq,
818 .resume_noirq = omap_mpuio_resume_noirq,
819};
820
821/* use platform_driver for this. */
822static struct platform_driver omap_mpuio_driver = {
823 .driver = {
824 .name = "mpuio",
825 .pm = &omap_mpuio_dev_pm_ops,
826 },
827};
828
829static struct platform_device omap_mpuio_device = {
830 .name = "mpuio",
831 .id = -1,
832 .dev = {
833 .driver = &omap_mpuio_driver.driver,
834 }
835 /* could list the /proc/iomem resources */
836};
837
838static inline void mpuio_init(struct gpio_bank *bank)
839{
840 platform_set_drvdata(&omap_mpuio_device, bank);
841
842 if (platform_driver_register(&omap_mpuio_driver) == 0)
843 (void) platform_device_register(&omap_mpuio_device);
844}
845
846/*---------------------------------------------------------------------*/
847
848static int gpio_input(struct gpio_chip *chip, unsigned offset)
849{
850 struct gpio_bank *bank;
851 unsigned long flags;
852
853 bank = container_of(chip, struct gpio_bank, chip);
854 spin_lock_irqsave(&bank->lock, flags);
855 _set_gpio_direction(bank, offset, 1);
856 spin_unlock_irqrestore(&bank->lock, flags);
857 return 0;
858}
859
860static int gpio_is_input(struct gpio_bank *bank, int mask)
861{
862 void __iomem *reg = bank->base + bank->regs->direction;
863
864 return __raw_readl(reg) & mask;
865}
866
867static int gpio_get(struct gpio_chip *chip, unsigned offset)
868{
869 struct gpio_bank *bank;
870 u32 mask;
871
872 bank = container_of(chip, struct gpio_bank, chip);
873 mask = (1 << offset);
874
875 if (gpio_is_input(bank, mask))
876 return _get_gpio_datain(bank, offset);
877 else
878 return _get_gpio_dataout(bank, offset);
879}
880
881static int gpio_output(struct gpio_chip *chip, unsigned offset, int value)
882{
883 struct gpio_bank *bank;
884 unsigned long flags;
885
886 bank = container_of(chip, struct gpio_bank, chip);
887 spin_lock_irqsave(&bank->lock, flags);
888 bank->set_dataout(bank, offset, value);
889 _set_gpio_direction(bank, offset, 0);
890 spin_unlock_irqrestore(&bank->lock, flags);
891 return 0;
892}
893
894static int gpio_debounce(struct gpio_chip *chip, unsigned offset,
895 unsigned debounce)
896{
897 struct gpio_bank *bank;
898 unsigned long flags;
899
900 bank = container_of(chip, struct gpio_bank, chip);
901
902 if (!bank->dbck) {
903 bank->dbck = clk_get(bank->dev, "dbclk");
904 if (IS_ERR(bank->dbck))
905 dev_err(bank->dev, "Could not get gpio dbck\n");
906 }
907
908 spin_lock_irqsave(&bank->lock, flags);
909 _set_gpio_debounce(bank, offset, debounce);
910 spin_unlock_irqrestore(&bank->lock, flags);
911
912 return 0;
913}
914
915static void gpio_set(struct gpio_chip *chip, unsigned offset, int value)
916{
917 struct gpio_bank *bank;
918 unsigned long flags;
919
920 bank = container_of(chip, struct gpio_bank, chip);
921 spin_lock_irqsave(&bank->lock, flags);
922 bank->set_dataout(bank, offset, value);
923 spin_unlock_irqrestore(&bank->lock, flags);
924}
925
926static int gpio_2irq(struct gpio_chip *chip, unsigned offset)
927{
928 struct gpio_bank *bank;
929
930 bank = container_of(chip, struct gpio_bank, chip);
931 return bank->irq_base + offset;
932}
933
934/*---------------------------------------------------------------------*/
935
936static void __init omap_gpio_show_rev(struct gpio_bank *bank)
937{
938 static bool called;
939 u32 rev;
940
941 if (called || bank->regs->revision == USHRT_MAX)
942 return;
943
944 rev = __raw_readw(bank->base + bank->regs->revision);
945 pr_info("OMAP GPIO hardware version %d.%d\n",
946 (rev >> 4) & 0x0f, rev & 0x0f);
947
948 called = true;
949}
950
951/* This lock class tells lockdep that GPIO irqs are in a different
952 * category than their parents, so it won't report false recursion.
953 */
954static struct lock_class_key gpio_lock_class;
955
956static void omap_gpio_mod_init(struct gpio_bank *bank)
957{
958 void __iomem *base = bank->base;
959 u32 l = 0xffffffff;
960
961 if (bank->width == 16)
962 l = 0xffff;
963
964 if (bank->is_mpuio) {
965 __raw_writel(l, bank->base + bank->regs->irqenable);
966 return;
967 }
968
969 _gpio_rmw(base, bank->regs->irqenable, l, bank->regs->irqenable_inv);
970 _gpio_rmw(base, bank->regs->irqstatus, l, !bank->regs->irqenable_inv);
971 if (bank->regs->debounce_en)
972 __raw_writel(0, base + bank->regs->debounce_en);
973
974 /* Save OE default value (0xffffffff) in the context */
975 bank->context.oe = __raw_readl(bank->base + bank->regs->direction);
976 /* Initialize interface clk ungated, module enabled */
977 if (bank->regs->ctrl)
978 __raw_writel(0, base + bank->regs->ctrl);
979}
980
981static __devinit void
982omap_mpuio_alloc_gc(struct gpio_bank *bank, unsigned int irq_start,
983 unsigned int num)
984{
985 struct irq_chip_generic *gc;
986 struct irq_chip_type *ct;
987
988 gc = irq_alloc_generic_chip("MPUIO", 1, irq_start, bank->base,
989 handle_simple_irq);
990 if (!gc) {
991 dev_err(bank->dev, "Memory alloc failed for gc\n");
992 return;
993 }
994
995 ct = gc->chip_types;
996
997 /* NOTE: No ack required, reading IRQ status clears it. */
998 ct->chip.irq_mask = irq_gc_mask_set_bit;
999 ct->chip.irq_unmask = irq_gc_mask_clr_bit;
1000 ct->chip.irq_set_type = gpio_irq_type;
1001
1002 if (bank->regs->wkup_en)
1003 ct->chip.irq_set_wake = gpio_wake_enable,
1004
1005 ct->regs.mask = OMAP_MPUIO_GPIO_INT / bank->stride;
1006 irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE,
1007 IRQ_NOREQUEST | IRQ_NOPROBE, 0);
1008}
1009
1010static void __devinit omap_gpio_chip_init(struct gpio_bank *bank)
1011{
1012 int j;
1013 static int gpio;
1014
1015 /*
1016 * REVISIT eventually switch from OMAP-specific gpio structs
1017 * over to the generic ones
1018 */
1019 bank->chip.request = omap_gpio_request;
1020 bank->chip.free = omap_gpio_free;
1021 bank->chip.direction_input = gpio_input;
1022 bank->chip.get = gpio_get;
1023 bank->chip.direction_output = gpio_output;
1024 bank->chip.set_debounce = gpio_debounce;
1025 bank->chip.set = gpio_set;
1026 bank->chip.to_irq = gpio_2irq;
1027 if (bank->is_mpuio) {
1028 bank->chip.label = "mpuio";
1029 if (bank->regs->wkup_en)
1030 bank->chip.dev = &omap_mpuio_device.dev;
1031 bank->chip.base = OMAP_MPUIO(0);
1032 } else {
1033 bank->chip.label = "gpio";
1034 bank->chip.base = gpio;
1035 gpio += bank->width;
1036 }
1037 bank->chip.ngpio = bank->width;
1038
1039 gpiochip_add(&bank->chip);
1040
1041 for (j = bank->irq_base; j < bank->irq_base + bank->width; j++) {
1042 irq_set_lockdep_class(j, &gpio_lock_class);
1043 irq_set_chip_data(j, bank);
1044 if (bank->is_mpuio) {
1045 omap_mpuio_alloc_gc(bank, j, bank->width);
1046 } else {
1047 irq_set_chip(j, &gpio_irq_chip);
1048 irq_set_handler(j, handle_simple_irq);
1049 set_irq_flags(j, IRQF_VALID);
1050 }
1051 }
1052 irq_set_chained_handler(bank->irq, gpio_irq_handler);
1053 irq_set_handler_data(bank->irq, bank);
1054}
1055
1056static const struct of_device_id omap_gpio_match[];
1057
1058static int __devinit omap_gpio_probe(struct platform_device *pdev)
1059{
1060 struct device *dev = &pdev->dev;
1061 struct device_node *node = dev->of_node;
1062 const struct of_device_id *match;
1063 struct omap_gpio_platform_data *pdata;
1064 struct resource *res;
1065 struct gpio_bank *bank;
1066 int ret = 0;
1067
1068 match = of_match_device(of_match_ptr(omap_gpio_match), dev);
1069
1070 pdata = match ? match->data : dev->platform_data;
1071 if (!pdata)
1072 return -EINVAL;
1073
1074 bank = devm_kzalloc(&pdev->dev, sizeof(struct gpio_bank), GFP_KERNEL);
1075 if (!bank) {
1076 dev_err(dev, "Memory alloc failed\n");
1077 return -ENOMEM;
1078 }
1079
1080 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1081 if (unlikely(!res)) {
1082 dev_err(dev, "Invalid IRQ resource\n");
1083 return -ENODEV;
1084 }
1085
1086 bank->irq = res->start;
1087 bank->dev = dev;
1088 bank->dbck_flag = pdata->dbck_flag;
1089 bank->stride = pdata->bank_stride;
1090 bank->width = pdata->bank_width;
1091 bank->is_mpuio = pdata->is_mpuio;
1092 bank->non_wakeup_gpios = pdata->non_wakeup_gpios;
1093 bank->loses_context = pdata->loses_context;
1094 bank->regs = pdata->regs;
1095#ifdef CONFIG_OF_GPIO
1096 bank->chip.of_node = of_node_get(node);
1097#endif
1098
1099 bank->irq_base = irq_alloc_descs(-1, 0, bank->width, 0);
1100 if (bank->irq_base < 0) {
1101 dev_err(dev, "Couldn't allocate IRQ numbers\n");
1102 return -ENODEV;
1103 }
1104
1105 bank->domain = irq_domain_add_legacy(node, bank->width, bank->irq_base,
1106 0, &irq_domain_simple_ops, NULL);
1107
1108 if (bank->regs->set_dataout && bank->regs->clr_dataout)
1109 bank->set_dataout = _set_gpio_dataout_reg;
1110 else
1111 bank->set_dataout = _set_gpio_dataout_mask;
1112
1113 spin_lock_init(&bank->lock);
1114
1115 /* Static mapping, never released */
1116 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1117 if (unlikely(!res)) {
1118 dev_err(dev, "Invalid mem resource\n");
1119 return -ENODEV;
1120 }
1121
1122 if (!devm_request_mem_region(dev, res->start, resource_size(res),
1123 pdev->name)) {
1124 dev_err(dev, "Region already claimed\n");
1125 return -EBUSY;
1126 }
1127
1128 bank->base = devm_ioremap(dev, res->start, resource_size(res));
1129 if (!bank->base) {
1130 dev_err(dev, "Could not ioremap\n");
1131 return -ENOMEM;
1132 }
1133
1134 platform_set_drvdata(pdev, bank);
1135
1136 pm_runtime_enable(bank->dev);
1137 pm_runtime_irq_safe(bank->dev);
1138 pm_runtime_get_sync(bank->dev);
1139
1140 if (bank->is_mpuio)
1141 mpuio_init(bank);
1142
1143 omap_gpio_mod_init(bank);
1144 omap_gpio_chip_init(bank);
1145 omap_gpio_show_rev(bank);
1146
1147 if (bank->loses_context)
1148 bank->get_context_loss_count = pdata->get_context_loss_count;
1149
1150 pm_runtime_put(bank->dev);
1151
1152 list_add_tail(&bank->node, &omap_gpio_list);
1153
1154 return ret;
1155}
1156
1157#ifdef CONFIG_ARCH_OMAP2PLUS
1158
1159#if defined(CONFIG_PM_RUNTIME)
1160static void omap_gpio_restore_context(struct gpio_bank *bank);
1161
1162static int omap_gpio_runtime_suspend(struct device *dev)
1163{
1164 struct platform_device *pdev = to_platform_device(dev);
1165 struct gpio_bank *bank = platform_get_drvdata(pdev);
1166 u32 l1 = 0, l2 = 0;
1167 unsigned long flags;
1168 u32 wake_low, wake_hi;
1169
1170 spin_lock_irqsave(&bank->lock, flags);
1171
1172 /*
1173 * Only edges can generate a wakeup event to the PRCM.
1174 *
1175 * Therefore, ensure any wake-up capable GPIOs have
1176 * edge-detection enabled before going idle to ensure a wakeup
1177 * to the PRCM is generated on a GPIO transition. (c.f. 34xx
1178 * NDA TRM 25.5.3.1)
1179 *
1180 * The normal values will be restored upon ->runtime_resume()
1181 * by writing back the values saved in bank->context.
1182 */
1183 wake_low = bank->context.leveldetect0 & bank->context.wake_en;
1184 if (wake_low)
1185 __raw_writel(wake_low | bank->context.fallingdetect,
1186 bank->base + bank->regs->fallingdetect);
1187 wake_hi = bank->context.leveldetect1 & bank->context.wake_en;
1188 if (wake_hi)
1189 __raw_writel(wake_hi | bank->context.risingdetect,
1190 bank->base + bank->regs->risingdetect);
1191
1192 if (!bank->enabled_non_wakeup_gpios)
1193 goto update_gpio_context_count;
1194
1195 if (bank->power_mode != OFF_MODE) {
1196 bank->power_mode = 0;
1197 goto update_gpio_context_count;
1198 }
1199 /*
1200 * If going to OFF, remove triggering for all
1201 * non-wakeup GPIOs. Otherwise spurious IRQs will be
1202 * generated. See OMAP2420 Errata item 1.101.
1203 */
1204 bank->saved_datain = __raw_readl(bank->base +
1205 bank->regs->datain);
1206 l1 = bank->context.fallingdetect;
1207 l2 = bank->context.risingdetect;
1208
1209 l1 &= ~bank->enabled_non_wakeup_gpios;
1210 l2 &= ~bank->enabled_non_wakeup_gpios;
1211
1212 __raw_writel(l1, bank->base + bank->regs->fallingdetect);
1213 __raw_writel(l2, bank->base + bank->regs->risingdetect);
1214
1215 bank->workaround_enabled = true;
1216
1217update_gpio_context_count:
1218 if (bank->get_context_loss_count)
1219 bank->context_loss_count =
1220 bank->get_context_loss_count(bank->dev);
1221
1222 _gpio_dbck_disable(bank);
1223 spin_unlock_irqrestore(&bank->lock, flags);
1224
1225 return 0;
1226}
1227
1228static int omap_gpio_runtime_resume(struct device *dev)
1229{
1230 struct platform_device *pdev = to_platform_device(dev);
1231 struct gpio_bank *bank = platform_get_drvdata(pdev);
1232 int context_lost_cnt_after;
1233 u32 l = 0, gen, gen0, gen1;
1234 unsigned long flags;
1235
1236 spin_lock_irqsave(&bank->lock, flags);
1237 _gpio_dbck_enable(bank);
1238
1239 /*
1240 * In ->runtime_suspend(), level-triggered, wakeup-enabled
1241 * GPIOs were set to edge trigger also in order to be able to
1242 * generate a PRCM wakeup. Here we restore the
1243 * pre-runtime_suspend() values for edge triggering.
1244 */
1245 __raw_writel(bank->context.fallingdetect,
1246 bank->base + bank->regs->fallingdetect);
1247 __raw_writel(bank->context.risingdetect,
1248 bank->base + bank->regs->risingdetect);
1249
1250 if (bank->get_context_loss_count) {
1251 context_lost_cnt_after =
1252 bank->get_context_loss_count(bank->dev);
1253 if (context_lost_cnt_after != bank->context_loss_count) {
1254 omap_gpio_restore_context(bank);
1255 } else {
1256 spin_unlock_irqrestore(&bank->lock, flags);
1257 return 0;
1258 }
1259 }
1260
1261 if (!bank->workaround_enabled) {
1262 spin_unlock_irqrestore(&bank->lock, flags);
1263 return 0;
1264 }
1265
1266 __raw_writel(bank->context.fallingdetect,
1267 bank->base + bank->regs->fallingdetect);
1268 __raw_writel(bank->context.risingdetect,
1269 bank->base + bank->regs->risingdetect);
1270 l = __raw_readl(bank->base + bank->regs->datain);
1271
1272 /*
1273 * Check if any of the non-wakeup interrupt GPIOs have changed
1274 * state. If so, generate an IRQ by software. This is
1275 * horribly racy, but it's the best we can do to work around
1276 * this silicon bug.
1277 */
1278 l ^= bank->saved_datain;
1279 l &= bank->enabled_non_wakeup_gpios;
1280
1281 /*
1282 * No need to generate IRQs for the rising edge for gpio IRQs
1283 * configured with falling edge only; and vice versa.
1284 */
1285 gen0 = l & bank->context.fallingdetect;
1286 gen0 &= bank->saved_datain;
1287
1288 gen1 = l & bank->context.risingdetect;
1289 gen1 &= ~(bank->saved_datain);
1290
1291 /* FIXME: Consider GPIO IRQs with level detections properly! */
1292 gen = l & (~(bank->context.fallingdetect) &
1293 ~(bank->context.risingdetect));
1294 /* Consider all GPIO IRQs needed to be updated */
1295 gen |= gen0 | gen1;
1296
1297 if (gen) {
1298 u32 old0, old1;
1299
1300 old0 = __raw_readl(bank->base + bank->regs->leveldetect0);
1301 old1 = __raw_readl(bank->base + bank->regs->leveldetect1);
1302
1303 if (!bank->regs->irqstatus_raw0) {
1304 __raw_writel(old0 | gen, bank->base +
1305 bank->regs->leveldetect0);
1306 __raw_writel(old1 | gen, bank->base +
1307 bank->regs->leveldetect1);
1308 }
1309
1310 if (bank->regs->irqstatus_raw0) {
1311 __raw_writel(old0 | l, bank->base +
1312 bank->regs->leveldetect0);
1313 __raw_writel(old1 | l, bank->base +
1314 bank->regs->leveldetect1);
1315 }
1316 __raw_writel(old0, bank->base + bank->regs->leveldetect0);
1317 __raw_writel(old1, bank->base + bank->regs->leveldetect1);
1318 }
1319
1320 bank->workaround_enabled = false;
1321 spin_unlock_irqrestore(&bank->lock, flags);
1322
1323 return 0;
1324}
1325#endif /* CONFIG_PM_RUNTIME */
1326
1327void omap2_gpio_prepare_for_idle(int pwr_mode)
1328{
1329 struct gpio_bank *bank;
1330
1331 list_for_each_entry(bank, &omap_gpio_list, node) {
1332 if (!bank->mod_usage || !bank->loses_context)
1333 continue;
1334
1335 bank->power_mode = pwr_mode;
1336
1337 pm_runtime_put_sync_suspend(bank->dev);
1338 }
1339}
1340
1341void omap2_gpio_resume_after_idle(void)
1342{
1343 struct gpio_bank *bank;
1344
1345 list_for_each_entry(bank, &omap_gpio_list, node) {
1346 if (!bank->mod_usage || !bank->loses_context)
1347 continue;
1348
1349 pm_runtime_get_sync(bank->dev);
1350 }
1351}
1352
1353#if defined(CONFIG_PM_RUNTIME)
1354static void omap_gpio_restore_context(struct gpio_bank *bank)
1355{
1356 __raw_writel(bank->context.wake_en,
1357 bank->base + bank->regs->wkup_en);
1358 __raw_writel(bank->context.ctrl, bank->base + bank->regs->ctrl);
1359 __raw_writel(bank->context.leveldetect0,
1360 bank->base + bank->regs->leveldetect0);
1361 __raw_writel(bank->context.leveldetect1,
1362 bank->base + bank->regs->leveldetect1);
1363 __raw_writel(bank->context.risingdetect,
1364 bank->base + bank->regs->risingdetect);
1365 __raw_writel(bank->context.fallingdetect,
1366 bank->base + bank->regs->fallingdetect);
1367 if (bank->regs->set_dataout && bank->regs->clr_dataout)
1368 __raw_writel(bank->context.dataout,
1369 bank->base + bank->regs->set_dataout);
1370 else
1371 __raw_writel(bank->context.dataout,
1372 bank->base + bank->regs->dataout);
1373 __raw_writel(bank->context.oe, bank->base + bank->regs->direction);
1374
1375 if (bank->dbck_enable_mask) {
1376 __raw_writel(bank->context.debounce, bank->base +
1377 bank->regs->debounce);
1378 __raw_writel(bank->context.debounce_en,
1379 bank->base + bank->regs->debounce_en);
1380 }
1381
1382 __raw_writel(bank->context.irqenable1,
1383 bank->base + bank->regs->irqenable);
1384 __raw_writel(bank->context.irqenable2,
1385 bank->base + bank->regs->irqenable2);
1386}
1387#endif /* CONFIG_PM_RUNTIME */
1388#else
1389#define omap_gpio_runtime_suspend NULL
1390#define omap_gpio_runtime_resume NULL
1391#endif
1392
1393static const struct dev_pm_ops gpio_pm_ops = {
1394 SET_RUNTIME_PM_OPS(omap_gpio_runtime_suspend, omap_gpio_runtime_resume,
1395 NULL)
1396};
1397
1398#if defined(CONFIG_OF)
1399static struct omap_gpio_reg_offs omap2_gpio_regs = {
1400 .revision = OMAP24XX_GPIO_REVISION,
1401 .direction = OMAP24XX_GPIO_OE,
1402 .datain = OMAP24XX_GPIO_DATAIN,
1403 .dataout = OMAP24XX_GPIO_DATAOUT,
1404 .set_dataout = OMAP24XX_GPIO_SETDATAOUT,
1405 .clr_dataout = OMAP24XX_GPIO_CLEARDATAOUT,
1406 .irqstatus = OMAP24XX_GPIO_IRQSTATUS1,
1407 .irqstatus2 = OMAP24XX_GPIO_IRQSTATUS2,
1408 .irqenable = OMAP24XX_GPIO_IRQENABLE1,
1409 .irqenable2 = OMAP24XX_GPIO_IRQENABLE2,
1410 .set_irqenable = OMAP24XX_GPIO_SETIRQENABLE1,
1411 .clr_irqenable = OMAP24XX_GPIO_CLEARIRQENABLE1,
1412 .debounce = OMAP24XX_GPIO_DEBOUNCE_VAL,
1413 .debounce_en = OMAP24XX_GPIO_DEBOUNCE_EN,
1414 .ctrl = OMAP24XX_GPIO_CTRL,
1415 .wkup_en = OMAP24XX_GPIO_WAKE_EN,
1416 .leveldetect0 = OMAP24XX_GPIO_LEVELDETECT0,
1417 .leveldetect1 = OMAP24XX_GPIO_LEVELDETECT1,
1418 .risingdetect = OMAP24XX_GPIO_RISINGDETECT,
1419 .fallingdetect = OMAP24XX_GPIO_FALLINGDETECT,
1420};
1421
1422static struct omap_gpio_reg_offs omap4_gpio_regs = {
1423 .revision = OMAP4_GPIO_REVISION,
1424 .direction = OMAP4_GPIO_OE,
1425 .datain = OMAP4_GPIO_DATAIN,
1426 .dataout = OMAP4_GPIO_DATAOUT,
1427 .set_dataout = OMAP4_GPIO_SETDATAOUT,
1428 .clr_dataout = OMAP4_GPIO_CLEARDATAOUT,
1429 .irqstatus = OMAP4_GPIO_IRQSTATUS0,
1430 .irqstatus2 = OMAP4_GPIO_IRQSTATUS1,
1431 .irqenable = OMAP4_GPIO_IRQSTATUSSET0,
1432 .irqenable2 = OMAP4_GPIO_IRQSTATUSSET1,
1433 .set_irqenable = OMAP4_GPIO_IRQSTATUSSET0,
1434 .clr_irqenable = OMAP4_GPIO_IRQSTATUSCLR0,
1435 .debounce = OMAP4_GPIO_DEBOUNCINGTIME,
1436 .debounce_en = OMAP4_GPIO_DEBOUNCENABLE,
1437 .ctrl = OMAP4_GPIO_CTRL,
1438 .wkup_en = OMAP4_GPIO_IRQWAKEN0,
1439 .leveldetect0 = OMAP4_GPIO_LEVELDETECT0,
1440 .leveldetect1 = OMAP4_GPIO_LEVELDETECT1,
1441 .risingdetect = OMAP4_GPIO_RISINGDETECT,
1442 .fallingdetect = OMAP4_GPIO_FALLINGDETECT,
1443};
1444
1445static struct omap_gpio_platform_data omap2_pdata = {
1446 .regs = &omap2_gpio_regs,
1447 .bank_width = 32,
1448 .dbck_flag = false,
1449};
1450
1451static struct omap_gpio_platform_data omap3_pdata = {
1452 .regs = &omap2_gpio_regs,
1453 .bank_width = 32,
1454 .dbck_flag = true,
1455};
1456
1457static struct omap_gpio_platform_data omap4_pdata = {
1458 .regs = &omap4_gpio_regs,
1459 .bank_width = 32,
1460 .dbck_flag = true,
1461};
1462
1463static const struct of_device_id omap_gpio_match[] = {
1464 {
1465 .compatible = "ti,omap4-gpio",
1466 .data = &omap4_pdata,
1467 },
1468 {
1469 .compatible = "ti,omap3-gpio",
1470 .data = &omap3_pdata,
1471 },
1472 {
1473 .compatible = "ti,omap2-gpio",
1474 .data = &omap2_pdata,
1475 },
1476 { },
1477};
1478MODULE_DEVICE_TABLE(of, omap_gpio_match);
1479#endif
1480
1481static struct platform_driver omap_gpio_driver = {
1482 .probe = omap_gpio_probe,
1483 .driver = {
1484 .name = "omap_gpio",
1485 .pm = &gpio_pm_ops,
1486 .of_match_table = of_match_ptr(omap_gpio_match),
1487 },
1488};
1489
1490/*
1491 * gpio driver register needs to be done before
1492 * machine_init functions access gpio APIs.
1493 * Hence omap_gpio_drv_reg() is a postcore_initcall.
1494 */
1495static int __init omap_gpio_drv_reg(void)
1496{
1497 return platform_driver_register(&omap_gpio_driver);
1498}
1499postcore_initcall(omap_gpio_drv_reg);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Support functions for OMAP GPIO
4 *
5 * Copyright (C) 2003-2005 Nokia Corporation
6 * Written by Juha Yrjölä <juha.yrjola@nokia.com>
7 *
8 * Copyright (C) 2009 Texas Instruments
9 * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
10 */
11
12#include <linux/init.h>
13#include <linux/module.h>
14#include <linux/interrupt.h>
15#include <linux/seq_file.h>
16#include <linux/syscore_ops.h>
17#include <linux/err.h>
18#include <linux/clk.h>
19#include <linux/io.h>
20#include <linux/cpu_pm.h>
21#include <linux/device.h>
22#include <linux/pm_runtime.h>
23#include <linux/pm.h>
24#include <linux/of.h>
25#include <linux/gpio/driver.h>
26#include <linux/bitops.h>
27#include <linux/platform_data/gpio-omap.h>
28
29#define OMAP4_GPIO_DEBOUNCINGTIME_MASK 0xFF
30
31struct gpio_regs {
32 u32 sysconfig;
33 u32 irqenable1;
34 u32 irqenable2;
35 u32 wake_en;
36 u32 ctrl;
37 u32 oe;
38 u32 leveldetect0;
39 u32 leveldetect1;
40 u32 risingdetect;
41 u32 fallingdetect;
42 u32 dataout;
43 u32 debounce;
44 u32 debounce_en;
45};
46
47struct gpio_bank {
48 void __iomem *base;
49 const struct omap_gpio_reg_offs *regs;
50 struct device *dev;
51
52 int irq;
53 u32 non_wakeup_gpios;
54 u32 enabled_non_wakeup_gpios;
55 struct gpio_regs context;
56 u32 saved_datain;
57 u32 level_mask;
58 u32 toggle_mask;
59 raw_spinlock_t lock;
60 raw_spinlock_t wa_lock;
61 struct gpio_chip chip;
62 struct clk *dbck;
63 struct notifier_block nb;
64 unsigned int is_suspended:1;
65 unsigned int needs_resume:1;
66 u32 mod_usage;
67 u32 irq_usage;
68 u32 dbck_enable_mask;
69 bool dbck_enabled;
70 bool is_mpuio;
71 bool dbck_flag;
72 bool loses_context;
73 bool context_valid;
74 int stride;
75 u32 width;
76 int context_loss_count;
77
78 void (*set_dataout)(struct gpio_bank *bank, unsigned gpio, int enable);
79 int (*get_context_loss_count)(struct device *dev);
80};
81
82#define GPIO_MOD_CTRL_BIT BIT(0)
83
84#define BANK_USED(bank) (bank->mod_usage || bank->irq_usage)
85#define LINE_USED(line, offset) (line & (BIT(offset)))
86
87static void omap_gpio_unmask_irq(struct irq_data *d);
88
89static inline struct gpio_bank *omap_irq_data_get_bank(struct irq_data *d)
90{
91 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
92 return gpiochip_get_data(chip);
93}
94
95static inline u32 omap_gpio_rmw(void __iomem *reg, u32 mask, bool set)
96{
97 u32 val = readl_relaxed(reg);
98
99 if (set)
100 val |= mask;
101 else
102 val &= ~mask;
103
104 writel_relaxed(val, reg);
105
106 return val;
107}
108
109static void omap_set_gpio_direction(struct gpio_bank *bank, int gpio,
110 int is_input)
111{
112 bank->context.oe = omap_gpio_rmw(bank->base + bank->regs->direction,
113 BIT(gpio), is_input);
114}
115
116
117/* set data out value using dedicate set/clear register */
118static void omap_set_gpio_dataout_reg(struct gpio_bank *bank, unsigned offset,
119 int enable)
120{
121 void __iomem *reg = bank->base;
122 u32 l = BIT(offset);
123
124 if (enable) {
125 reg += bank->regs->set_dataout;
126 bank->context.dataout |= l;
127 } else {
128 reg += bank->regs->clr_dataout;
129 bank->context.dataout &= ~l;
130 }
131
132 writel_relaxed(l, reg);
133}
134
135/* set data out value using mask register */
136static void omap_set_gpio_dataout_mask(struct gpio_bank *bank, unsigned offset,
137 int enable)
138{
139 bank->context.dataout = omap_gpio_rmw(bank->base + bank->regs->dataout,
140 BIT(offset), enable);
141}
142
143static inline void omap_gpio_dbck_enable(struct gpio_bank *bank)
144{
145 if (bank->dbck_enable_mask && !bank->dbck_enabled) {
146 clk_enable(bank->dbck);
147 bank->dbck_enabled = true;
148
149 writel_relaxed(bank->dbck_enable_mask,
150 bank->base + bank->regs->debounce_en);
151 }
152}
153
154static inline void omap_gpio_dbck_disable(struct gpio_bank *bank)
155{
156 if (bank->dbck_enable_mask && bank->dbck_enabled) {
157 /*
158 * Disable debounce before cutting it's clock. If debounce is
159 * enabled but the clock is not, GPIO module seems to be unable
160 * to detect events and generate interrupts at least on OMAP3.
161 */
162 writel_relaxed(0, bank->base + bank->regs->debounce_en);
163
164 clk_disable(bank->dbck);
165 bank->dbck_enabled = false;
166 }
167}
168
169/**
170 * omap2_set_gpio_debounce - low level gpio debounce time
171 * @bank: the gpio bank we're acting upon
172 * @offset: the gpio number on this @bank
173 * @debounce: debounce time to use
174 *
175 * OMAP's debounce time is in 31us steps
176 * <debounce time> = (GPIO_DEBOUNCINGTIME[7:0].DEBOUNCETIME + 1) x 31
177 * so we need to convert and round up to the closest unit.
178 *
179 * Return: 0 on success, negative error otherwise.
180 */
181static int omap2_set_gpio_debounce(struct gpio_bank *bank, unsigned offset,
182 unsigned debounce)
183{
184 u32 val;
185 u32 l;
186 bool enable = !!debounce;
187
188 if (!bank->dbck_flag)
189 return -ENOTSUPP;
190
191 if (enable) {
192 debounce = DIV_ROUND_UP(debounce, 31) - 1;
193 if ((debounce & OMAP4_GPIO_DEBOUNCINGTIME_MASK) != debounce)
194 return -EINVAL;
195 }
196
197 l = BIT(offset);
198
199 clk_enable(bank->dbck);
200 writel_relaxed(debounce, bank->base + bank->regs->debounce);
201
202 val = omap_gpio_rmw(bank->base + bank->regs->debounce_en, l, enable);
203 bank->dbck_enable_mask = val;
204
205 clk_disable(bank->dbck);
206 /*
207 * Enable debounce clock per module.
208 * This call is mandatory because in omap_gpio_request() when
209 * *_runtime_get_sync() is called, _gpio_dbck_enable() within
210 * runtime callbck fails to turn on dbck because dbck_enable_mask
211 * used within _gpio_dbck_enable() is still not initialized at
212 * that point. Therefore we have to enable dbck here.
213 */
214 omap_gpio_dbck_enable(bank);
215 if (bank->dbck_enable_mask) {
216 bank->context.debounce = debounce;
217 bank->context.debounce_en = val;
218 }
219
220 return 0;
221}
222
223/**
224 * omap_clear_gpio_debounce - clear debounce settings for a gpio
225 * @bank: the gpio bank we're acting upon
226 * @offset: the gpio number on this @bank
227 *
228 * If a gpio is using debounce, then clear the debounce enable bit and if
229 * this is the only gpio in this bank using debounce, then clear the debounce
230 * time too. The debounce clock will also be disabled when calling this function
231 * if this is the only gpio in the bank using debounce.
232 */
233static void omap_clear_gpio_debounce(struct gpio_bank *bank, unsigned offset)
234{
235 u32 gpio_bit = BIT(offset);
236
237 if (!bank->dbck_flag)
238 return;
239
240 if (!(bank->dbck_enable_mask & gpio_bit))
241 return;
242
243 bank->dbck_enable_mask &= ~gpio_bit;
244 bank->context.debounce_en &= ~gpio_bit;
245 writel_relaxed(bank->context.debounce_en,
246 bank->base + bank->regs->debounce_en);
247
248 if (!bank->dbck_enable_mask) {
249 bank->context.debounce = 0;
250 writel_relaxed(bank->context.debounce, bank->base +
251 bank->regs->debounce);
252 clk_disable(bank->dbck);
253 bank->dbck_enabled = false;
254 }
255}
256
257/*
258 * Off mode wake-up capable GPIOs in bank(s) that are in the wakeup domain.
259 * See TRM section for GPIO for "Wake-Up Generation" for the list of GPIOs
260 * in wakeup domain. If bank->non_wakeup_gpios is not configured, assume none
261 * are capable waking up the system from off mode.
262 */
263static bool omap_gpio_is_off_wakeup_capable(struct gpio_bank *bank, u32 gpio_mask)
264{
265 u32 no_wake = bank->non_wakeup_gpios;
266
267 if (no_wake)
268 return !!(~no_wake & gpio_mask);
269
270 return false;
271}
272
273static inline void omap_set_gpio_trigger(struct gpio_bank *bank, int gpio,
274 unsigned trigger)
275{
276 void __iomem *base = bank->base;
277 u32 gpio_bit = BIT(gpio);
278
279 omap_gpio_rmw(base + bank->regs->leveldetect0, gpio_bit,
280 trigger & IRQ_TYPE_LEVEL_LOW);
281 omap_gpio_rmw(base + bank->regs->leveldetect1, gpio_bit,
282 trigger & IRQ_TYPE_LEVEL_HIGH);
283
284 /*
285 * We need the edge detection enabled for to allow the GPIO block
286 * to be woken from idle state. Set the appropriate edge detection
287 * in addition to the level detection.
288 */
289 omap_gpio_rmw(base + bank->regs->risingdetect, gpio_bit,
290 trigger & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_LEVEL_HIGH));
291 omap_gpio_rmw(base + bank->regs->fallingdetect, gpio_bit,
292 trigger & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_LEVEL_LOW));
293
294 bank->context.leveldetect0 =
295 readl_relaxed(bank->base + bank->regs->leveldetect0);
296 bank->context.leveldetect1 =
297 readl_relaxed(bank->base + bank->regs->leveldetect1);
298 bank->context.risingdetect =
299 readl_relaxed(bank->base + bank->regs->risingdetect);
300 bank->context.fallingdetect =
301 readl_relaxed(bank->base + bank->regs->fallingdetect);
302
303 bank->level_mask = bank->context.leveldetect0 |
304 bank->context.leveldetect1;
305
306 /* This part needs to be executed always for OMAP{34xx, 44xx} */
307 if (!bank->regs->irqctrl && !omap_gpio_is_off_wakeup_capable(bank, gpio)) {
308 /*
309 * Log the edge gpio and manually trigger the IRQ
310 * after resume if the input level changes
311 * to avoid irq lost during PER RET/OFF mode
312 * Applies for omap2 non-wakeup gpio and all omap3 gpios
313 */
314 if (trigger & IRQ_TYPE_EDGE_BOTH)
315 bank->enabled_non_wakeup_gpios |= gpio_bit;
316 else
317 bank->enabled_non_wakeup_gpios &= ~gpio_bit;
318 }
319}
320
321/*
322 * This only applies to chips that can't do both rising and falling edge
323 * detection at once. For all other chips, this function is a noop.
324 */
325static void omap_toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio)
326{
327 if (IS_ENABLED(CONFIG_ARCH_OMAP1) && bank->regs->irqctrl) {
328 void __iomem *reg = bank->base + bank->regs->irqctrl;
329
330 writel_relaxed(readl_relaxed(reg) ^ BIT(gpio), reg);
331 }
332}
333
334static int omap_set_gpio_triggering(struct gpio_bank *bank, int gpio,
335 unsigned trigger)
336{
337 void __iomem *reg = bank->base;
338 u32 l = 0;
339
340 if (bank->regs->leveldetect0 && bank->regs->wkup_en) {
341 omap_set_gpio_trigger(bank, gpio, trigger);
342 } else if (bank->regs->irqctrl) {
343 reg += bank->regs->irqctrl;
344
345 l = readl_relaxed(reg);
346 if ((trigger & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH)
347 bank->toggle_mask |= BIT(gpio);
348 if (trigger & IRQ_TYPE_EDGE_RISING)
349 l |= BIT(gpio);
350 else if (trigger & IRQ_TYPE_EDGE_FALLING)
351 l &= ~(BIT(gpio));
352 else
353 return -EINVAL;
354
355 writel_relaxed(l, reg);
356 } else if (bank->regs->edgectrl1) {
357 if (gpio & 0x08)
358 reg += bank->regs->edgectrl2;
359 else
360 reg += bank->regs->edgectrl1;
361
362 gpio &= 0x07;
363 l = readl_relaxed(reg);
364 l &= ~(3 << (gpio << 1));
365 if (trigger & IRQ_TYPE_EDGE_RISING)
366 l |= 2 << (gpio << 1);
367 if (trigger & IRQ_TYPE_EDGE_FALLING)
368 l |= BIT(gpio << 1);
369 writel_relaxed(l, reg);
370 }
371 return 0;
372}
373
374static void omap_enable_gpio_module(struct gpio_bank *bank, unsigned offset)
375{
376 if (bank->regs->pinctrl) {
377 void __iomem *reg = bank->base + bank->regs->pinctrl;
378
379 /* Claim the pin for MPU */
380 writel_relaxed(readl_relaxed(reg) | (BIT(offset)), reg);
381 }
382
383 if (bank->regs->ctrl && !BANK_USED(bank)) {
384 void __iomem *reg = bank->base + bank->regs->ctrl;
385 u32 ctrl;
386
387 ctrl = readl_relaxed(reg);
388 /* Module is enabled, clocks are not gated */
389 ctrl &= ~GPIO_MOD_CTRL_BIT;
390 writel_relaxed(ctrl, reg);
391 bank->context.ctrl = ctrl;
392 }
393}
394
395static void omap_disable_gpio_module(struct gpio_bank *bank, unsigned offset)
396{
397 if (bank->regs->ctrl && !BANK_USED(bank)) {
398 void __iomem *reg = bank->base + bank->regs->ctrl;
399 u32 ctrl;
400
401 ctrl = readl_relaxed(reg);
402 /* Module is disabled, clocks are gated */
403 ctrl |= GPIO_MOD_CTRL_BIT;
404 writel_relaxed(ctrl, reg);
405 bank->context.ctrl = ctrl;
406 }
407}
408
409static int omap_gpio_is_input(struct gpio_bank *bank, unsigned offset)
410{
411 void __iomem *reg = bank->base + bank->regs->direction;
412
413 return readl_relaxed(reg) & BIT(offset);
414}
415
416static void omap_gpio_init_irq(struct gpio_bank *bank, unsigned offset)
417{
418 if (!LINE_USED(bank->mod_usage, offset)) {
419 omap_enable_gpio_module(bank, offset);
420 omap_set_gpio_direction(bank, offset, 1);
421 }
422 bank->irq_usage |= BIT(offset);
423}
424
425static int omap_gpio_irq_type(struct irq_data *d, unsigned type)
426{
427 struct gpio_bank *bank = omap_irq_data_get_bank(d);
428 int retval;
429 unsigned long flags;
430 unsigned offset = d->hwirq;
431
432 if (type & ~IRQ_TYPE_SENSE_MASK)
433 return -EINVAL;
434
435 if (!bank->regs->leveldetect0 &&
436 (type & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH)))
437 return -EINVAL;
438
439 raw_spin_lock_irqsave(&bank->lock, flags);
440 retval = omap_set_gpio_triggering(bank, offset, type);
441 if (retval) {
442 raw_spin_unlock_irqrestore(&bank->lock, flags);
443 goto error;
444 }
445 omap_gpio_init_irq(bank, offset);
446 if (!omap_gpio_is_input(bank, offset)) {
447 raw_spin_unlock_irqrestore(&bank->lock, flags);
448 retval = -EINVAL;
449 goto error;
450 }
451 raw_spin_unlock_irqrestore(&bank->lock, flags);
452
453 if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
454 irq_set_handler_locked(d, handle_level_irq);
455 else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
456 /*
457 * Edge IRQs are already cleared/acked in irq_handler and
458 * not need to be masked, as result handle_edge_irq()
459 * logic is excessed here and may cause lose of interrupts.
460 * So just use handle_simple_irq.
461 */
462 irq_set_handler_locked(d, handle_simple_irq);
463
464 return 0;
465
466error:
467 return retval;
468}
469
470static void omap_clear_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
471{
472 void __iomem *reg = bank->base;
473
474 reg += bank->regs->irqstatus;
475 writel_relaxed(gpio_mask, reg);
476
477 /* Workaround for clearing DSP GPIO interrupts to allow retention */
478 if (bank->regs->irqstatus2) {
479 reg = bank->base + bank->regs->irqstatus2;
480 writel_relaxed(gpio_mask, reg);
481 }
482
483 /* Flush posted write for the irq status to avoid spurious interrupts */
484 readl_relaxed(reg);
485}
486
487static inline void omap_clear_gpio_irqstatus(struct gpio_bank *bank,
488 unsigned offset)
489{
490 omap_clear_gpio_irqbank(bank, BIT(offset));
491}
492
493static u32 omap_get_gpio_irqbank_mask(struct gpio_bank *bank)
494{
495 void __iomem *reg = bank->base;
496 u32 l;
497 u32 mask = (BIT(bank->width)) - 1;
498
499 reg += bank->regs->irqenable;
500 l = readl_relaxed(reg);
501 if (bank->regs->irqenable_inv)
502 l = ~l;
503 l &= mask;
504 return l;
505}
506
507static inline void omap_set_gpio_irqenable(struct gpio_bank *bank,
508 unsigned offset, int enable)
509{
510 void __iomem *reg = bank->base;
511 u32 gpio_mask = BIT(offset);
512
513 if (bank->regs->set_irqenable && bank->regs->clr_irqenable) {
514 if (enable) {
515 reg += bank->regs->set_irqenable;
516 bank->context.irqenable1 |= gpio_mask;
517 } else {
518 reg += bank->regs->clr_irqenable;
519 bank->context.irqenable1 &= ~gpio_mask;
520 }
521 writel_relaxed(gpio_mask, reg);
522 } else {
523 bank->context.irqenable1 =
524 omap_gpio_rmw(reg + bank->regs->irqenable, gpio_mask,
525 enable ^ bank->regs->irqenable_inv);
526 }
527
528 /*
529 * Program GPIO wakeup along with IRQ enable to satisfy OMAP4430 TRM
530 * note requiring correlation between the IRQ enable registers and
531 * the wakeup registers. In any case, we want wakeup from idle
532 * enabled for the GPIOs which support this feature.
533 */
534 if (bank->regs->wkup_en &&
535 (bank->regs->edgectrl1 || !(bank->non_wakeup_gpios & gpio_mask))) {
536 bank->context.wake_en =
537 omap_gpio_rmw(bank->base + bank->regs->wkup_en,
538 gpio_mask, enable);
539 }
540}
541
542/* Use disable_irq_wake() and enable_irq_wake() functions from drivers */
543static int omap_gpio_wake_enable(struct irq_data *d, unsigned int enable)
544{
545 struct gpio_bank *bank = omap_irq_data_get_bank(d);
546
547 return irq_set_irq_wake(bank->irq, enable);
548}
549
550/*
551 * We need to unmask the GPIO bank interrupt as soon as possible to
552 * avoid missing GPIO interrupts for other lines in the bank.
553 * Then we need to mask-read-clear-unmask the triggered GPIO lines
554 * in the bank to avoid missing nested interrupts for a GPIO line.
555 * If we wait to unmask individual GPIO lines in the bank after the
556 * line's interrupt handler has been run, we may miss some nested
557 * interrupts.
558 */
559static irqreturn_t omap_gpio_irq_handler(int irq, void *gpiobank)
560{
561 void __iomem *isr_reg = NULL;
562 u32 enabled, isr, edge;
563 unsigned int bit;
564 struct gpio_bank *bank = gpiobank;
565 unsigned long wa_lock_flags;
566 unsigned long lock_flags;
567
568 isr_reg = bank->base + bank->regs->irqstatus;
569 if (WARN_ON(!isr_reg))
570 goto exit;
571
572 if (WARN_ONCE(!pm_runtime_active(bank->chip.parent),
573 "gpio irq%i while runtime suspended?\n", irq))
574 return IRQ_NONE;
575
576 while (1) {
577 raw_spin_lock_irqsave(&bank->lock, lock_flags);
578
579 enabled = omap_get_gpio_irqbank_mask(bank);
580 isr = readl_relaxed(isr_reg) & enabled;
581
582 /*
583 * Clear edge sensitive interrupts before calling handler(s)
584 * so subsequent edge transitions are not missed while the
585 * handlers are running.
586 */
587 edge = isr & ~bank->level_mask;
588 if (edge)
589 omap_clear_gpio_irqbank(bank, edge);
590
591 raw_spin_unlock_irqrestore(&bank->lock, lock_flags);
592
593 if (!isr)
594 break;
595
596 while (isr) {
597 bit = __ffs(isr);
598 isr &= ~(BIT(bit));
599
600 raw_spin_lock_irqsave(&bank->lock, lock_flags);
601 /*
602 * Some chips can't respond to both rising and falling
603 * at the same time. If this irq was requested with
604 * both flags, we need to flip the ICR data for the IRQ
605 * to respond to the IRQ for the opposite direction.
606 * This will be indicated in the bank toggle_mask.
607 */
608 if (bank->toggle_mask & (BIT(bit)))
609 omap_toggle_gpio_edge_triggering(bank, bit);
610
611 raw_spin_unlock_irqrestore(&bank->lock, lock_flags);
612
613 raw_spin_lock_irqsave(&bank->wa_lock, wa_lock_flags);
614
615 generic_handle_domain_irq(bank->chip.irq.domain, bit);
616
617 raw_spin_unlock_irqrestore(&bank->wa_lock,
618 wa_lock_flags);
619 }
620 }
621exit:
622 return IRQ_HANDLED;
623}
624
625static unsigned int omap_gpio_irq_startup(struct irq_data *d)
626{
627 struct gpio_bank *bank = omap_irq_data_get_bank(d);
628 unsigned long flags;
629 unsigned offset = d->hwirq;
630
631 raw_spin_lock_irqsave(&bank->lock, flags);
632
633 if (!LINE_USED(bank->mod_usage, offset))
634 omap_set_gpio_direction(bank, offset, 1);
635 omap_enable_gpio_module(bank, offset);
636 bank->irq_usage |= BIT(offset);
637
638 raw_spin_unlock_irqrestore(&bank->lock, flags);
639 omap_gpio_unmask_irq(d);
640
641 return 0;
642}
643
644static void omap_gpio_irq_shutdown(struct irq_data *d)
645{
646 struct gpio_bank *bank = omap_irq_data_get_bank(d);
647 unsigned long flags;
648 unsigned offset = d->hwirq;
649
650 raw_spin_lock_irqsave(&bank->lock, flags);
651 bank->irq_usage &= ~(BIT(offset));
652 omap_set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);
653 omap_clear_gpio_irqstatus(bank, offset);
654 omap_set_gpio_irqenable(bank, offset, 0);
655 if (!LINE_USED(bank->mod_usage, offset))
656 omap_clear_gpio_debounce(bank, offset);
657 omap_disable_gpio_module(bank, offset);
658 raw_spin_unlock_irqrestore(&bank->lock, flags);
659}
660
661static void omap_gpio_irq_bus_lock(struct irq_data *data)
662{
663 struct gpio_bank *bank = omap_irq_data_get_bank(data);
664
665 pm_runtime_get_sync(bank->chip.parent);
666}
667
668static void gpio_irq_bus_sync_unlock(struct irq_data *data)
669{
670 struct gpio_bank *bank = omap_irq_data_get_bank(data);
671
672 pm_runtime_put(bank->chip.parent);
673}
674
675static void omap_gpio_mask_irq(struct irq_data *d)
676{
677 struct gpio_bank *bank = omap_irq_data_get_bank(d);
678 unsigned offset = d->hwirq;
679 unsigned long flags;
680
681 raw_spin_lock_irqsave(&bank->lock, flags);
682 omap_set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);
683 omap_set_gpio_irqenable(bank, offset, 0);
684 raw_spin_unlock_irqrestore(&bank->lock, flags);
685 gpiochip_disable_irq(&bank->chip, offset);
686}
687
688static void omap_gpio_unmask_irq(struct irq_data *d)
689{
690 struct gpio_bank *bank = omap_irq_data_get_bank(d);
691 unsigned offset = d->hwirq;
692 u32 trigger = irqd_get_trigger_type(d);
693 unsigned long flags;
694
695 gpiochip_enable_irq(&bank->chip, offset);
696 raw_spin_lock_irqsave(&bank->lock, flags);
697 omap_set_gpio_irqenable(bank, offset, 1);
698
699 /*
700 * For level-triggered GPIOs, clearing must be done after the source
701 * is cleared, thus after the handler has run. OMAP4 needs this done
702 * after enabing the interrupt to clear the wakeup status.
703 */
704 if (bank->regs->leveldetect0 && bank->regs->wkup_en &&
705 trigger & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
706 omap_clear_gpio_irqstatus(bank, offset);
707
708 if (trigger)
709 omap_set_gpio_triggering(bank, offset, trigger);
710
711 raw_spin_unlock_irqrestore(&bank->lock, flags);
712}
713
714static void omap_gpio_irq_print_chip(struct irq_data *d, struct seq_file *p)
715{
716 struct gpio_bank *bank = omap_irq_data_get_bank(d);
717
718 seq_puts(p, dev_name(bank->dev));
719}
720
721static const struct irq_chip omap_gpio_irq_chip = {
722 .irq_startup = omap_gpio_irq_startup,
723 .irq_shutdown = omap_gpio_irq_shutdown,
724 .irq_mask = omap_gpio_mask_irq,
725 .irq_unmask = omap_gpio_unmask_irq,
726 .irq_set_type = omap_gpio_irq_type,
727 .irq_set_wake = omap_gpio_wake_enable,
728 .irq_bus_lock = omap_gpio_irq_bus_lock,
729 .irq_bus_sync_unlock = gpio_irq_bus_sync_unlock,
730 .irq_print_chip = omap_gpio_irq_print_chip,
731 .flags = IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_IMMUTABLE,
732 GPIOCHIP_IRQ_RESOURCE_HELPERS,
733};
734
735static const struct irq_chip omap_gpio_irq_chip_nowake = {
736 .irq_startup = omap_gpio_irq_startup,
737 .irq_shutdown = omap_gpio_irq_shutdown,
738 .irq_mask = omap_gpio_mask_irq,
739 .irq_unmask = omap_gpio_unmask_irq,
740 .irq_set_type = omap_gpio_irq_type,
741 .irq_bus_lock = omap_gpio_irq_bus_lock,
742 .irq_bus_sync_unlock = gpio_irq_bus_sync_unlock,
743 .irq_print_chip = omap_gpio_irq_print_chip,
744 .flags = IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_IMMUTABLE,
745 GPIOCHIP_IRQ_RESOURCE_HELPERS,
746};
747
748/*---------------------------------------------------------------------*/
749
750static int omap_mpuio_suspend_noirq(struct device *dev)
751{
752 struct gpio_bank *bank = dev_get_drvdata(dev);
753 void __iomem *mask_reg = bank->base +
754 OMAP_MPUIO_GPIO_MASKIT / bank->stride;
755 unsigned long flags;
756
757 raw_spin_lock_irqsave(&bank->lock, flags);
758 writel_relaxed(0xffff & ~bank->context.wake_en, mask_reg);
759 raw_spin_unlock_irqrestore(&bank->lock, flags);
760
761 return 0;
762}
763
764static int omap_mpuio_resume_noirq(struct device *dev)
765{
766 struct gpio_bank *bank = dev_get_drvdata(dev);
767 void __iomem *mask_reg = bank->base +
768 OMAP_MPUIO_GPIO_MASKIT / bank->stride;
769 unsigned long flags;
770
771 raw_spin_lock_irqsave(&bank->lock, flags);
772 writel_relaxed(bank->context.wake_en, mask_reg);
773 raw_spin_unlock_irqrestore(&bank->lock, flags);
774
775 return 0;
776}
777
778static const struct dev_pm_ops omap_mpuio_dev_pm_ops = {
779 .suspend_noirq = omap_mpuio_suspend_noirq,
780 .resume_noirq = omap_mpuio_resume_noirq,
781};
782
783/* use platform_driver for this. */
784static struct platform_driver omap_mpuio_driver = {
785 .driver = {
786 .name = "mpuio",
787 .pm = &omap_mpuio_dev_pm_ops,
788 },
789};
790
791static struct platform_device omap_mpuio_device = {
792 .name = "mpuio",
793 .id = -1,
794 .dev = {
795 .driver = &omap_mpuio_driver.driver,
796 }
797 /* could list the /proc/iomem resources */
798};
799
800static inline void omap_mpuio_init(struct gpio_bank *bank)
801{
802 platform_set_drvdata(&omap_mpuio_device, bank);
803
804 if (platform_driver_register(&omap_mpuio_driver) == 0)
805 (void) platform_device_register(&omap_mpuio_device);
806}
807
808/*---------------------------------------------------------------------*/
809
810static int omap_gpio_request(struct gpio_chip *chip, unsigned offset)
811{
812 struct gpio_bank *bank = gpiochip_get_data(chip);
813 unsigned long flags;
814
815 pm_runtime_get_sync(chip->parent);
816
817 raw_spin_lock_irqsave(&bank->lock, flags);
818 omap_enable_gpio_module(bank, offset);
819 bank->mod_usage |= BIT(offset);
820 raw_spin_unlock_irqrestore(&bank->lock, flags);
821
822 return 0;
823}
824
825static void omap_gpio_free(struct gpio_chip *chip, unsigned offset)
826{
827 struct gpio_bank *bank = gpiochip_get_data(chip);
828 unsigned long flags;
829
830 raw_spin_lock_irqsave(&bank->lock, flags);
831 bank->mod_usage &= ~(BIT(offset));
832 if (!LINE_USED(bank->irq_usage, offset)) {
833 omap_set_gpio_direction(bank, offset, 1);
834 omap_clear_gpio_debounce(bank, offset);
835 }
836 omap_disable_gpio_module(bank, offset);
837 raw_spin_unlock_irqrestore(&bank->lock, flags);
838
839 pm_runtime_put(chip->parent);
840}
841
842static int omap_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
843{
844 struct gpio_bank *bank = gpiochip_get_data(chip);
845
846 if (readl_relaxed(bank->base + bank->regs->direction) & BIT(offset))
847 return GPIO_LINE_DIRECTION_IN;
848
849 return GPIO_LINE_DIRECTION_OUT;
850}
851
852static int omap_gpio_input(struct gpio_chip *chip, unsigned offset)
853{
854 struct gpio_bank *bank;
855 unsigned long flags;
856
857 bank = gpiochip_get_data(chip);
858 raw_spin_lock_irqsave(&bank->lock, flags);
859 omap_set_gpio_direction(bank, offset, 1);
860 raw_spin_unlock_irqrestore(&bank->lock, flags);
861 return 0;
862}
863
864static int omap_gpio_get(struct gpio_chip *chip, unsigned offset)
865{
866 struct gpio_bank *bank = gpiochip_get_data(chip);
867 void __iomem *reg;
868
869 if (omap_gpio_is_input(bank, offset))
870 reg = bank->base + bank->regs->datain;
871 else
872 reg = bank->base + bank->regs->dataout;
873
874 return (readl_relaxed(reg) & BIT(offset)) != 0;
875}
876
877static int omap_gpio_output(struct gpio_chip *chip, unsigned offset, int value)
878{
879 struct gpio_bank *bank;
880 unsigned long flags;
881
882 bank = gpiochip_get_data(chip);
883 raw_spin_lock_irqsave(&bank->lock, flags);
884 bank->set_dataout(bank, offset, value);
885 omap_set_gpio_direction(bank, offset, 0);
886 raw_spin_unlock_irqrestore(&bank->lock, flags);
887 return 0;
888}
889
890static int omap_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,
891 unsigned long *bits)
892{
893 struct gpio_bank *bank = gpiochip_get_data(chip);
894 void __iomem *base = bank->base;
895 u32 direction, m, val = 0;
896
897 direction = readl_relaxed(base + bank->regs->direction);
898
899 m = direction & *mask;
900 if (m)
901 val |= readl_relaxed(base + bank->regs->datain) & m;
902
903 m = ~direction & *mask;
904 if (m)
905 val |= readl_relaxed(base + bank->regs->dataout) & m;
906
907 *bits = val;
908
909 return 0;
910}
911
912static int omap_gpio_debounce(struct gpio_chip *chip, unsigned offset,
913 unsigned debounce)
914{
915 struct gpio_bank *bank;
916 unsigned long flags;
917 int ret;
918
919 bank = gpiochip_get_data(chip);
920
921 raw_spin_lock_irqsave(&bank->lock, flags);
922 ret = omap2_set_gpio_debounce(bank, offset, debounce);
923 raw_spin_unlock_irqrestore(&bank->lock, flags);
924
925 if (ret)
926 dev_info(chip->parent,
927 "Could not set line %u debounce to %u microseconds (%d)",
928 offset, debounce, ret);
929
930 return ret;
931}
932
933static int omap_gpio_set_config(struct gpio_chip *chip, unsigned offset,
934 unsigned long config)
935{
936 u32 debounce;
937 int ret = -ENOTSUPP;
938
939 switch (pinconf_to_config_param(config)) {
940 case PIN_CONFIG_BIAS_DISABLE:
941 case PIN_CONFIG_BIAS_PULL_UP:
942 case PIN_CONFIG_BIAS_PULL_DOWN:
943 ret = gpiochip_generic_config(chip, offset, config);
944 break;
945 case PIN_CONFIG_INPUT_DEBOUNCE:
946 debounce = pinconf_to_config_argument(config);
947 ret = omap_gpio_debounce(chip, offset, debounce);
948 break;
949 default:
950 break;
951 }
952
953 return ret;
954}
955
956static void omap_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
957{
958 struct gpio_bank *bank;
959 unsigned long flags;
960
961 bank = gpiochip_get_data(chip);
962 raw_spin_lock_irqsave(&bank->lock, flags);
963 bank->set_dataout(bank, offset, value);
964 raw_spin_unlock_irqrestore(&bank->lock, flags);
965}
966
967static void omap_gpio_set_multiple(struct gpio_chip *chip, unsigned long *mask,
968 unsigned long *bits)
969{
970 struct gpio_bank *bank = gpiochip_get_data(chip);
971 void __iomem *reg = bank->base + bank->regs->dataout;
972 unsigned long flags;
973 u32 l;
974
975 raw_spin_lock_irqsave(&bank->lock, flags);
976 l = (readl_relaxed(reg) & ~*mask) | (*bits & *mask);
977 writel_relaxed(l, reg);
978 bank->context.dataout = l;
979 raw_spin_unlock_irqrestore(&bank->lock, flags);
980}
981
982/*---------------------------------------------------------------------*/
983
984static void omap_gpio_show_rev(struct gpio_bank *bank)
985{
986 static bool called;
987 u32 rev;
988
989 if (called || bank->regs->revision == USHRT_MAX)
990 return;
991
992 rev = readw_relaxed(bank->base + bank->regs->revision);
993 pr_info("OMAP GPIO hardware version %d.%d\n",
994 (rev >> 4) & 0x0f, rev & 0x0f);
995
996 called = true;
997}
998
999static void omap_gpio_mod_init(struct gpio_bank *bank)
1000{
1001 void __iomem *base = bank->base;
1002 u32 l = 0xffffffff;
1003
1004 if (bank->width == 16)
1005 l = 0xffff;
1006
1007 if (bank->is_mpuio) {
1008 writel_relaxed(l, bank->base + bank->regs->irqenable);
1009 return;
1010 }
1011
1012 omap_gpio_rmw(base + bank->regs->irqenable, l,
1013 bank->regs->irqenable_inv);
1014 omap_gpio_rmw(base + bank->regs->irqstatus, l,
1015 !bank->regs->irqenable_inv);
1016 if (bank->regs->debounce_en)
1017 writel_relaxed(0, base + bank->regs->debounce_en);
1018
1019 /* Save OE default value (0xffffffff) in the context */
1020 bank->context.oe = readl_relaxed(bank->base + bank->regs->direction);
1021 /* Initialize interface clk ungated, module enabled */
1022 if (bank->regs->ctrl)
1023 writel_relaxed(0, base + bank->regs->ctrl);
1024}
1025
1026static int omap_gpio_chip_init(struct gpio_bank *bank, struct device *pm_dev)
1027{
1028 struct gpio_irq_chip *irq;
1029 static int gpio;
1030 const char *label;
1031 int ret;
1032
1033 /*
1034 * REVISIT eventually switch from OMAP-specific gpio structs
1035 * over to the generic ones
1036 */
1037 bank->chip.request = omap_gpio_request;
1038 bank->chip.free = omap_gpio_free;
1039 bank->chip.get_direction = omap_gpio_get_direction;
1040 bank->chip.direction_input = omap_gpio_input;
1041 bank->chip.get = omap_gpio_get;
1042 bank->chip.get_multiple = omap_gpio_get_multiple;
1043 bank->chip.direction_output = omap_gpio_output;
1044 bank->chip.set_config = omap_gpio_set_config;
1045 bank->chip.set = omap_gpio_set;
1046 bank->chip.set_multiple = omap_gpio_set_multiple;
1047 if (bank->is_mpuio) {
1048 bank->chip.label = "mpuio";
1049 if (bank->regs->wkup_en)
1050 bank->chip.parent = &omap_mpuio_device.dev;
1051 } else {
1052 label = devm_kasprintf(bank->chip.parent, GFP_KERNEL, "gpio-%d-%d",
1053 gpio, gpio + bank->width - 1);
1054 if (!label)
1055 return -ENOMEM;
1056 bank->chip.label = label;
1057 }
1058 bank->chip.base = -1;
1059 bank->chip.ngpio = bank->width;
1060
1061 irq = &bank->chip.irq;
1062 /* MPUIO is a bit different, reading IRQ status clears it */
1063 if (bank->is_mpuio && !bank->regs->wkup_en)
1064 gpio_irq_chip_set_chip(irq, &omap_gpio_irq_chip_nowake);
1065 else
1066 gpio_irq_chip_set_chip(irq, &omap_gpio_irq_chip);
1067 irq->handler = handle_bad_irq;
1068 irq->default_type = IRQ_TYPE_NONE;
1069 irq->num_parents = 1;
1070 irq->parents = &bank->irq;
1071
1072 ret = gpiochip_add_data(&bank->chip, bank);
1073 if (ret)
1074 return dev_err_probe(bank->chip.parent, ret, "Could not register gpio chip\n");
1075
1076 irq_domain_set_pm_device(bank->chip.irq.domain, pm_dev);
1077 ret = devm_request_irq(bank->chip.parent, bank->irq,
1078 omap_gpio_irq_handler,
1079 0, dev_name(bank->chip.parent), bank);
1080 if (ret)
1081 gpiochip_remove(&bank->chip);
1082
1083 if (!bank->is_mpuio)
1084 gpio += bank->width;
1085
1086 return ret;
1087}
1088
1089static void omap_gpio_init_context(struct gpio_bank *p)
1090{
1091 const struct omap_gpio_reg_offs *regs = p->regs;
1092 void __iomem *base = p->base;
1093
1094 p->context.sysconfig = readl_relaxed(base + regs->sysconfig);
1095 p->context.ctrl = readl_relaxed(base + regs->ctrl);
1096 p->context.oe = readl_relaxed(base + regs->direction);
1097 p->context.wake_en = readl_relaxed(base + regs->wkup_en);
1098 p->context.leveldetect0 = readl_relaxed(base + regs->leveldetect0);
1099 p->context.leveldetect1 = readl_relaxed(base + regs->leveldetect1);
1100 p->context.risingdetect = readl_relaxed(base + regs->risingdetect);
1101 p->context.fallingdetect = readl_relaxed(base + regs->fallingdetect);
1102 p->context.irqenable1 = readl_relaxed(base + regs->irqenable);
1103 p->context.irqenable2 = readl_relaxed(base + regs->irqenable2);
1104 p->context.dataout = readl_relaxed(base + regs->dataout);
1105
1106 p->context_valid = true;
1107}
1108
1109static void omap_gpio_restore_context(struct gpio_bank *bank)
1110{
1111 const struct omap_gpio_reg_offs *regs = bank->regs;
1112 void __iomem *base = bank->base;
1113
1114 writel_relaxed(bank->context.sysconfig, base + regs->sysconfig);
1115 writel_relaxed(bank->context.wake_en, base + regs->wkup_en);
1116 writel_relaxed(bank->context.ctrl, base + regs->ctrl);
1117 writel_relaxed(bank->context.leveldetect0, base + regs->leveldetect0);
1118 writel_relaxed(bank->context.leveldetect1, base + regs->leveldetect1);
1119 writel_relaxed(bank->context.risingdetect, base + regs->risingdetect);
1120 writel_relaxed(bank->context.fallingdetect, base + regs->fallingdetect);
1121 writel_relaxed(bank->context.dataout, base + regs->dataout);
1122 writel_relaxed(bank->context.oe, base + regs->direction);
1123
1124 if (bank->dbck_enable_mask) {
1125 writel_relaxed(bank->context.debounce, base + regs->debounce);
1126 writel_relaxed(bank->context.debounce_en,
1127 base + regs->debounce_en);
1128 }
1129
1130 writel_relaxed(bank->context.irqenable1, base + regs->irqenable);
1131 writel_relaxed(bank->context.irqenable2, base + regs->irqenable2);
1132}
1133
1134static void omap_gpio_idle(struct gpio_bank *bank, bool may_lose_context)
1135{
1136 struct device *dev = bank->chip.parent;
1137 void __iomem *base = bank->base;
1138 u32 mask, nowake;
1139
1140 bank->saved_datain = readl_relaxed(base + bank->regs->datain);
1141
1142 /* Save syconfig, it's runtime value can be different from init value */
1143 if (bank->loses_context)
1144 bank->context.sysconfig = readl_relaxed(base + bank->regs->sysconfig);
1145
1146 if (!bank->enabled_non_wakeup_gpios)
1147 goto update_gpio_context_count;
1148
1149 /* Check for pending EDGE_FALLING, ignore EDGE_BOTH */
1150 mask = bank->enabled_non_wakeup_gpios & bank->context.fallingdetect;
1151 mask &= ~bank->context.risingdetect;
1152 bank->saved_datain |= mask;
1153
1154 /* Check for pending EDGE_RISING, ignore EDGE_BOTH */
1155 mask = bank->enabled_non_wakeup_gpios & bank->context.risingdetect;
1156 mask &= ~bank->context.fallingdetect;
1157 bank->saved_datain &= ~mask;
1158
1159 if (!may_lose_context)
1160 goto update_gpio_context_count;
1161
1162 /*
1163 * If going to OFF, remove triggering for all wkup domain
1164 * non-wakeup GPIOs. Otherwise spurious IRQs will be
1165 * generated. See OMAP2420 Errata item 1.101.
1166 */
1167 if (!bank->loses_context && bank->enabled_non_wakeup_gpios) {
1168 nowake = bank->enabled_non_wakeup_gpios;
1169 omap_gpio_rmw(base + bank->regs->fallingdetect, nowake, ~nowake);
1170 omap_gpio_rmw(base + bank->regs->risingdetect, nowake, ~nowake);
1171 }
1172
1173update_gpio_context_count:
1174 if (bank->get_context_loss_count)
1175 bank->context_loss_count =
1176 bank->get_context_loss_count(dev);
1177
1178 omap_gpio_dbck_disable(bank);
1179}
1180
1181static void omap_gpio_unidle(struct gpio_bank *bank)
1182{
1183 struct device *dev = bank->chip.parent;
1184 u32 l = 0, gen, gen0, gen1;
1185 int c;
1186
1187 /*
1188 * On the first resume during the probe, the context has not
1189 * been initialised and so initialise it now. Also initialise
1190 * the context loss count.
1191 */
1192 if (bank->loses_context && !bank->context_valid) {
1193 omap_gpio_init_context(bank);
1194
1195 if (bank->get_context_loss_count)
1196 bank->context_loss_count =
1197 bank->get_context_loss_count(dev);
1198 }
1199
1200 omap_gpio_dbck_enable(bank);
1201
1202 if (bank->loses_context) {
1203 if (!bank->get_context_loss_count) {
1204 omap_gpio_restore_context(bank);
1205 } else {
1206 c = bank->get_context_loss_count(dev);
1207 if (c != bank->context_loss_count) {
1208 omap_gpio_restore_context(bank);
1209 } else {
1210 return;
1211 }
1212 }
1213 } else {
1214 /* Restore changes done for OMAP2420 errata 1.101 */
1215 writel_relaxed(bank->context.fallingdetect,
1216 bank->base + bank->regs->fallingdetect);
1217 writel_relaxed(bank->context.risingdetect,
1218 bank->base + bank->regs->risingdetect);
1219 }
1220
1221 l = readl_relaxed(bank->base + bank->regs->datain);
1222
1223 /*
1224 * Check if any of the non-wakeup interrupt GPIOs have changed
1225 * state. If so, generate an IRQ by software. This is
1226 * horribly racy, but it's the best we can do to work around
1227 * this silicon bug.
1228 */
1229 l ^= bank->saved_datain;
1230 l &= bank->enabled_non_wakeup_gpios;
1231
1232 /*
1233 * No need to generate IRQs for the rising edge for gpio IRQs
1234 * configured with falling edge only; and vice versa.
1235 */
1236 gen0 = l & bank->context.fallingdetect;
1237 gen0 &= bank->saved_datain;
1238
1239 gen1 = l & bank->context.risingdetect;
1240 gen1 &= ~(bank->saved_datain);
1241
1242 /* FIXME: Consider GPIO IRQs with level detections properly! */
1243 gen = l & (~(bank->context.fallingdetect) &
1244 ~(bank->context.risingdetect));
1245 /* Consider all GPIO IRQs needed to be updated */
1246 gen |= gen0 | gen1;
1247
1248 if (gen) {
1249 u32 old0, old1;
1250
1251 old0 = readl_relaxed(bank->base + bank->regs->leveldetect0);
1252 old1 = readl_relaxed(bank->base + bank->regs->leveldetect1);
1253
1254 if (!bank->regs->irqstatus_raw0) {
1255 writel_relaxed(old0 | gen, bank->base +
1256 bank->regs->leveldetect0);
1257 writel_relaxed(old1 | gen, bank->base +
1258 bank->regs->leveldetect1);
1259 }
1260
1261 if (bank->regs->irqstatus_raw0) {
1262 writel_relaxed(old0 | l, bank->base +
1263 bank->regs->leveldetect0);
1264 writel_relaxed(old1 | l, bank->base +
1265 bank->regs->leveldetect1);
1266 }
1267 writel_relaxed(old0, bank->base + bank->regs->leveldetect0);
1268 writel_relaxed(old1, bank->base + bank->regs->leveldetect1);
1269 }
1270}
1271
1272static int gpio_omap_cpu_notifier(struct notifier_block *nb,
1273 unsigned long cmd, void *v)
1274{
1275 struct gpio_bank *bank;
1276 unsigned long flags;
1277 int ret = NOTIFY_OK;
1278 u32 isr, mask;
1279
1280 bank = container_of(nb, struct gpio_bank, nb);
1281
1282 raw_spin_lock_irqsave(&bank->lock, flags);
1283 if (bank->is_suspended)
1284 goto out_unlock;
1285
1286 switch (cmd) {
1287 case CPU_CLUSTER_PM_ENTER:
1288 mask = omap_get_gpio_irqbank_mask(bank);
1289 isr = readl_relaxed(bank->base + bank->regs->irqstatus) & mask;
1290 if (isr) {
1291 ret = NOTIFY_BAD;
1292 break;
1293 }
1294 omap_gpio_idle(bank, true);
1295 break;
1296 case CPU_CLUSTER_PM_ENTER_FAILED:
1297 case CPU_CLUSTER_PM_EXIT:
1298 omap_gpio_unidle(bank);
1299 break;
1300 }
1301
1302out_unlock:
1303 raw_spin_unlock_irqrestore(&bank->lock, flags);
1304
1305 return ret;
1306}
1307
1308static const struct omap_gpio_reg_offs omap2_gpio_regs = {
1309 .revision = OMAP24XX_GPIO_REVISION,
1310 .sysconfig = OMAP24XX_GPIO_SYSCONFIG,
1311 .direction = OMAP24XX_GPIO_OE,
1312 .datain = OMAP24XX_GPIO_DATAIN,
1313 .dataout = OMAP24XX_GPIO_DATAOUT,
1314 .set_dataout = OMAP24XX_GPIO_SETDATAOUT,
1315 .clr_dataout = OMAP24XX_GPIO_CLEARDATAOUT,
1316 .irqstatus = OMAP24XX_GPIO_IRQSTATUS1,
1317 .irqstatus2 = OMAP24XX_GPIO_IRQSTATUS2,
1318 .irqenable = OMAP24XX_GPIO_IRQENABLE1,
1319 .irqenable2 = OMAP24XX_GPIO_IRQENABLE2,
1320 .set_irqenable = OMAP24XX_GPIO_SETIRQENABLE1,
1321 .clr_irqenable = OMAP24XX_GPIO_CLEARIRQENABLE1,
1322 .debounce = OMAP24XX_GPIO_DEBOUNCE_VAL,
1323 .debounce_en = OMAP24XX_GPIO_DEBOUNCE_EN,
1324 .ctrl = OMAP24XX_GPIO_CTRL,
1325 .wkup_en = OMAP24XX_GPIO_WAKE_EN,
1326 .leveldetect0 = OMAP24XX_GPIO_LEVELDETECT0,
1327 .leveldetect1 = OMAP24XX_GPIO_LEVELDETECT1,
1328 .risingdetect = OMAP24XX_GPIO_RISINGDETECT,
1329 .fallingdetect = OMAP24XX_GPIO_FALLINGDETECT,
1330};
1331
1332static const struct omap_gpio_reg_offs omap4_gpio_regs = {
1333 .revision = OMAP4_GPIO_REVISION,
1334 .sysconfig = OMAP4_GPIO_SYSCONFIG,
1335 .direction = OMAP4_GPIO_OE,
1336 .datain = OMAP4_GPIO_DATAIN,
1337 .dataout = OMAP4_GPIO_DATAOUT,
1338 .set_dataout = OMAP4_GPIO_SETDATAOUT,
1339 .clr_dataout = OMAP4_GPIO_CLEARDATAOUT,
1340 .irqstatus = OMAP4_GPIO_IRQSTATUS0,
1341 .irqstatus2 = OMAP4_GPIO_IRQSTATUS1,
1342 .irqstatus_raw0 = OMAP4_GPIO_IRQSTATUSRAW0,
1343 .irqstatus_raw1 = OMAP4_GPIO_IRQSTATUSRAW1,
1344 .irqenable = OMAP4_GPIO_IRQSTATUSSET0,
1345 .irqenable2 = OMAP4_GPIO_IRQSTATUSSET1,
1346 .set_irqenable = OMAP4_GPIO_IRQSTATUSSET0,
1347 .clr_irqenable = OMAP4_GPIO_IRQSTATUSCLR0,
1348 .debounce = OMAP4_GPIO_DEBOUNCINGTIME,
1349 .debounce_en = OMAP4_GPIO_DEBOUNCENABLE,
1350 .ctrl = OMAP4_GPIO_CTRL,
1351 .wkup_en = OMAP4_GPIO_IRQWAKEN0,
1352 .leveldetect0 = OMAP4_GPIO_LEVELDETECT0,
1353 .leveldetect1 = OMAP4_GPIO_LEVELDETECT1,
1354 .risingdetect = OMAP4_GPIO_RISINGDETECT,
1355 .fallingdetect = OMAP4_GPIO_FALLINGDETECT,
1356};
1357
1358static const struct omap_gpio_platform_data omap2_pdata = {
1359 .regs = &omap2_gpio_regs,
1360 .bank_width = 32,
1361 .dbck_flag = false,
1362};
1363
1364static const struct omap_gpio_platform_data omap3_pdata = {
1365 .regs = &omap2_gpio_regs,
1366 .bank_width = 32,
1367 .dbck_flag = true,
1368};
1369
1370static const struct omap_gpio_platform_data omap4_pdata = {
1371 .regs = &omap4_gpio_regs,
1372 .bank_width = 32,
1373 .dbck_flag = true,
1374};
1375
1376static const struct of_device_id omap_gpio_match[] = {
1377 {
1378 .compatible = "ti,omap4-gpio",
1379 .data = &omap4_pdata,
1380 },
1381 {
1382 .compatible = "ti,omap3-gpio",
1383 .data = &omap3_pdata,
1384 },
1385 {
1386 .compatible = "ti,omap2-gpio",
1387 .data = &omap2_pdata,
1388 },
1389 { },
1390};
1391MODULE_DEVICE_TABLE(of, omap_gpio_match);
1392
1393static int omap_gpio_probe(struct platform_device *pdev)
1394{
1395 struct device *dev = &pdev->dev;
1396 struct device_node *node = dev->of_node;
1397 const struct omap_gpio_platform_data *pdata;
1398 struct gpio_bank *bank;
1399 int ret;
1400
1401 pdata = device_get_match_data(dev);
1402
1403 pdata = pdata ?: dev_get_platdata(dev);
1404 if (!pdata)
1405 return -EINVAL;
1406
1407 bank = devm_kzalloc(dev, sizeof(*bank), GFP_KERNEL);
1408 if (!bank)
1409 return -ENOMEM;
1410
1411 bank->dev = dev;
1412
1413 bank->irq = platform_get_irq(pdev, 0);
1414 if (bank->irq < 0)
1415 return bank->irq;
1416
1417 bank->chip.parent = dev;
1418 bank->chip.owner = THIS_MODULE;
1419 bank->dbck_flag = pdata->dbck_flag;
1420 bank->stride = pdata->bank_stride;
1421 bank->width = pdata->bank_width;
1422 bank->is_mpuio = pdata->is_mpuio;
1423 bank->non_wakeup_gpios = pdata->non_wakeup_gpios;
1424 bank->regs = pdata->regs;
1425
1426 if (node) {
1427 if (!of_property_read_bool(node, "ti,gpio-always-on"))
1428 bank->loses_context = true;
1429 } else {
1430 bank->loses_context = pdata->loses_context;
1431
1432 if (bank->loses_context)
1433 bank->get_context_loss_count =
1434 pdata->get_context_loss_count;
1435 }
1436
1437 if (bank->regs->set_dataout && bank->regs->clr_dataout)
1438 bank->set_dataout = omap_set_gpio_dataout_reg;
1439 else
1440 bank->set_dataout = omap_set_gpio_dataout_mask;
1441
1442 raw_spin_lock_init(&bank->lock);
1443 raw_spin_lock_init(&bank->wa_lock);
1444
1445 /* Static mapping, never released */
1446 bank->base = devm_platform_ioremap_resource(pdev, 0);
1447 if (IS_ERR(bank->base)) {
1448 return PTR_ERR(bank->base);
1449 }
1450
1451 if (bank->dbck_flag) {
1452 bank->dbck = devm_clk_get(dev, "dbclk");
1453 if (IS_ERR(bank->dbck)) {
1454 dev_err(dev,
1455 "Could not get gpio dbck. Disable debounce\n");
1456 bank->dbck_flag = false;
1457 } else {
1458 clk_prepare(bank->dbck);
1459 }
1460 }
1461
1462 platform_set_drvdata(pdev, bank);
1463
1464 pm_runtime_enable(dev);
1465 pm_runtime_get_sync(dev);
1466
1467 if (bank->is_mpuio)
1468 omap_mpuio_init(bank);
1469
1470 omap_gpio_mod_init(bank);
1471
1472 ret = omap_gpio_chip_init(bank, dev);
1473 if (ret) {
1474 pm_runtime_put_sync(dev);
1475 pm_runtime_disable(dev);
1476 if (bank->dbck_flag)
1477 clk_unprepare(bank->dbck);
1478 return ret;
1479 }
1480
1481 omap_gpio_show_rev(bank);
1482
1483 bank->nb.notifier_call = gpio_omap_cpu_notifier;
1484 cpu_pm_register_notifier(&bank->nb);
1485
1486 pm_runtime_put(dev);
1487
1488 return 0;
1489}
1490
1491static void omap_gpio_remove(struct platform_device *pdev)
1492{
1493 struct gpio_bank *bank = platform_get_drvdata(pdev);
1494
1495 cpu_pm_unregister_notifier(&bank->nb);
1496 gpiochip_remove(&bank->chip);
1497 pm_runtime_disable(&pdev->dev);
1498 if (bank->dbck_flag)
1499 clk_unprepare(bank->dbck);
1500}
1501
1502static int __maybe_unused omap_gpio_runtime_suspend(struct device *dev)
1503{
1504 struct gpio_bank *bank = dev_get_drvdata(dev);
1505 unsigned long flags;
1506
1507 raw_spin_lock_irqsave(&bank->lock, flags);
1508 omap_gpio_idle(bank, true);
1509 bank->is_suspended = true;
1510 raw_spin_unlock_irqrestore(&bank->lock, flags);
1511
1512 return 0;
1513}
1514
1515static int __maybe_unused omap_gpio_runtime_resume(struct device *dev)
1516{
1517 struct gpio_bank *bank = dev_get_drvdata(dev);
1518 unsigned long flags;
1519
1520 raw_spin_lock_irqsave(&bank->lock, flags);
1521 omap_gpio_unidle(bank);
1522 bank->is_suspended = false;
1523 raw_spin_unlock_irqrestore(&bank->lock, flags);
1524
1525 return 0;
1526}
1527
1528static int __maybe_unused omap_gpio_suspend(struct device *dev)
1529{
1530 struct gpio_bank *bank = dev_get_drvdata(dev);
1531
1532 if (bank->is_suspended)
1533 return 0;
1534
1535 bank->needs_resume = 1;
1536
1537 return omap_gpio_runtime_suspend(dev);
1538}
1539
1540static int __maybe_unused omap_gpio_resume(struct device *dev)
1541{
1542 struct gpio_bank *bank = dev_get_drvdata(dev);
1543
1544 if (!bank->needs_resume)
1545 return 0;
1546
1547 bank->needs_resume = 0;
1548
1549 return omap_gpio_runtime_resume(dev);
1550}
1551
1552static const struct dev_pm_ops gpio_pm_ops = {
1553 SET_RUNTIME_PM_OPS(omap_gpio_runtime_suspend, omap_gpio_runtime_resume,
1554 NULL)
1555 SET_LATE_SYSTEM_SLEEP_PM_OPS(omap_gpio_suspend, omap_gpio_resume)
1556};
1557
1558static struct platform_driver omap_gpio_driver = {
1559 .probe = omap_gpio_probe,
1560 .remove = omap_gpio_remove,
1561 .driver = {
1562 .name = "omap_gpio",
1563 .pm = &gpio_pm_ops,
1564 .of_match_table = omap_gpio_match,
1565 },
1566};
1567
1568/*
1569 * gpio driver register needs to be done before
1570 * machine_init functions access gpio APIs.
1571 * Hence omap_gpio_drv_reg() is a postcore_initcall.
1572 */
1573static int __init omap_gpio_drv_reg(void)
1574{
1575 return platform_driver_register(&omap_gpio_driver);
1576}
1577postcore_initcall(omap_gpio_drv_reg);
1578
1579static void __exit omap_gpio_exit(void)
1580{
1581 platform_driver_unregister(&omap_gpio_driver);
1582}
1583module_exit(omap_gpio_exit);
1584
1585MODULE_DESCRIPTION("omap gpio driver");
1586MODULE_ALIAS("platform:gpio-omap");
1587MODULE_LICENSE("GPL v2");