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