]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - drivers/gpio/gpio-omap.c
projects / mirror_ubuntu-artful-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge tag 'clk-for-linus-3.20' of git://git.linaro.org/people/mike.turquette/linux
[mirror_ubuntu-artful-kernel.git] / drivers / gpio / gpio-omap.c
1 /*
2 * Support functions for OMAP GPIO
3 *
4 * Copyright (C) 2003-2005 Nokia Corporation
5 * Written by Juha Yrjölä <juha.yrjola@nokia.com>
6 *
7 * Copyright (C) 2009 Texas Instruments
8 * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 */
14
15 #include <linux/init.h>
16 #include <linux/module.h>
17 #include <linux/interrupt.h>
18 #include <linux/syscore_ops.h>
19 #include <linux/err.h>
20 #include <linux/clk.h>
21 #include <linux/io.h>
22 #include <linux/device.h>
23 #include <linux/pm_runtime.h>
24 #include <linux/pm.h>
25 #include <linux/of.h>
26 #include <linux/of_device.h>
27 #include <linux/gpio.h>
28 #include <linux/bitops.h>
29 #include <linux/platform_data/gpio-omap.h>
30
31 #define OFF_MODE 1
32
33 static LIST_HEAD(omap_gpio_list);
34
35 struct gpio_regs {
36 u32 irqenable1;
37 u32 irqenable2;
38 u32 wake_en;
39 u32 ctrl;
40 u32 oe;
41 u32 leveldetect0;
42 u32 leveldetect1;
43 u32 risingdetect;
44 u32 fallingdetect;
45 u32 dataout;
46 u32 debounce;
47 u32 debounce_en;
48 };
49
50 struct gpio_bank {
51 struct list_head node;
52 void __iomem *base;
53 u16 irq;
54 u32 non_wakeup_gpios;
55 u32 enabled_non_wakeup_gpios;
56 struct gpio_regs context;
57 u32 saved_datain;
58 u32 level_mask;
59 u32 toggle_mask;
60 spinlock_t lock;
61 struct gpio_chip chip;
62 struct clk *dbck;
63 u32 mod_usage;
64 u32 irq_usage;
65 u32 dbck_enable_mask;
66 bool dbck_enabled;
67 struct device *dev;
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 int power_mode;
76 bool workaround_enabled;
77
78 void (*set_dataout)(struct gpio_bank *bank, int gpio, int enable);
79 int (*get_context_loss_count)(struct device *dev);
80
81 struct omap_gpio_reg_offs *regs;
82 };
83
84 #define GPIO_INDEX(bank, gpio) (gpio % bank->width)
85 #define GPIO_BIT(bank, gpio) (BIT(GPIO_INDEX(bank, gpio)))
86 #define GPIO_MOD_CTRL_BIT BIT(0)
87
88 #define BANK_USED(bank) (bank->mod_usage || bank->irq_usage)
89 #define LINE_USED(line, offset) (line & (BIT(offset)))
90
91 static void omap_gpio_unmask_irq(struct irq_data *d);
92
93 static int omap_irq_to_gpio(struct gpio_bank *bank, unsigned int gpio_irq)
94 {
95 return bank->chip.base + gpio_irq;
96 }
97
98 static inline struct gpio_bank *omap_irq_data_get_bank(struct irq_data *d)
99 {
100 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
101 return container_of(chip, struct gpio_bank, chip);
102 }
103
104 static void omap_set_gpio_direction(struct gpio_bank *bank, int gpio,
105 int is_input)
106 {
107 void __iomem *reg = bank->base;
108 u32 l;
109
110 reg += bank->regs->direction;
111 l = readl_relaxed(reg);
112 if (is_input)
113 l |= BIT(gpio);
114 else
115 l &= ~(BIT(gpio));
116 writel_relaxed(l, reg);
117 bank->context.oe = l;
118 }
119
120
121 /* set data out value using dedicate set/clear register */
122 static void omap_set_gpio_dataout_reg(struct gpio_bank *bank, int gpio,
123 int enable)
124 {
125 void __iomem *reg = bank->base;
126 u32 l = GPIO_BIT(bank, gpio);
127
128 if (enable) {
129 reg += bank->regs->set_dataout;
130 bank->context.dataout |= l;
131 } else {
132 reg += bank->regs->clr_dataout;
133 bank->context.dataout &= ~l;
134 }
135
136 writel_relaxed(l, reg);
137 }
138
139 /* set data out value using mask register */
140 static void omap_set_gpio_dataout_mask(struct gpio_bank *bank, int gpio,
141 int enable)
142 {
143 void __iomem *reg = bank->base + bank->regs->dataout;
144 u32 gpio_bit = GPIO_BIT(bank, gpio);
145 u32 l;
146
147 l = readl_relaxed(reg);
148 if (enable)
149 l |= gpio_bit;
150 else
151 l &= ~gpio_bit;
152 writel_relaxed(l, reg);
153 bank->context.dataout = l;
154 }
155
156 static int omap_get_gpio_datain(struct gpio_bank *bank, int offset)
157 {
158 void __iomem *reg = bank->base + bank->regs->datain;
159
160 return (readl_relaxed(reg) & (BIT(offset))) != 0;
161 }
162
163 static int omap_get_gpio_dataout(struct gpio_bank *bank, int offset)
164 {
165 void __iomem *reg = bank->base + bank->regs->dataout;
166
167 return (readl_relaxed(reg) & (BIT(offset))) != 0;
168 }
169
170 static inline void omap_gpio_rmw(void __iomem *base, u32 reg, u32 mask, bool set)
171 {
172 int l = readl_relaxed(base + reg);
173
174 if (set)
175 l |= mask;
176 else
177 l &= ~mask;
178
179 writel_relaxed(l, base + reg);
180 }
181
182 static inline void omap_gpio_dbck_enable(struct gpio_bank *bank)
183 {
184 if (bank->dbck_enable_mask && !bank->dbck_enabled) {
185 clk_prepare_enable(bank->dbck);
186 bank->dbck_enabled = true;
187
188 writel_relaxed(bank->dbck_enable_mask,
189 bank->base + bank->regs->debounce_en);
190 }
191 }
192
193 static inline void omap_gpio_dbck_disable(struct gpio_bank *bank)
194 {
195 if (bank->dbck_enable_mask && bank->dbck_enabled) {
196 /*
197 * Disable debounce before cutting it's clock. If debounce is
198 * enabled but the clock is not, GPIO module seems to be unable
199 * to detect events and generate interrupts at least on OMAP3.
200 */
201 writel_relaxed(0, bank->base + bank->regs->debounce_en);
202
203 clk_disable_unprepare(bank->dbck);
204 bank->dbck_enabled = false;
205 }
206 }
207
208 /**
209 * omap2_set_gpio_debounce - low level gpio debounce time
210 * @bank: the gpio bank we're acting upon
211 * @gpio: the gpio number on this @gpio
212 * @debounce: debounce time to use
213 *
214 * OMAP's debounce time is in 31us steps so we need
215 * to convert and round up to the closest unit.
216 */
217 static void omap2_set_gpio_debounce(struct gpio_bank *bank, unsigned gpio,
218 unsigned debounce)
219 {
220 void __iomem *reg;
221 u32 val;
222 u32 l;
223
224 if (!bank->dbck_flag)
225 return;
226
227 if (debounce < 32)
228 debounce = 0x01;
229 else if (debounce > 7936)
230 debounce = 0xff;
231 else
232 debounce = (debounce / 0x1f) - 1;
233
234 l = GPIO_BIT(bank, gpio);
235
236 clk_prepare_enable(bank->dbck);
237 reg = bank->base + bank->regs->debounce;
238 writel_relaxed(debounce, reg);
239
240 reg = bank->base + bank->regs->debounce_en;
241 val = readl_relaxed(reg);
242
243 if (debounce)
244 val |= l;
245 else
246 val &= ~l;
247 bank->dbck_enable_mask = val;
248
249 writel_relaxed(val, reg);
250 clk_disable_unprepare(bank->dbck);
251 /*
252 * Enable debounce clock per module.
253 * This call is mandatory because in omap_gpio_request() when
254 * *_runtime_get_sync() is called, _gpio_dbck_enable() within
255 * runtime callbck fails to turn on dbck because dbck_enable_mask
256 * used within _gpio_dbck_enable() is still not initialized at
257 * that point. Therefore we have to enable dbck here.
258 */
259 omap_gpio_dbck_enable(bank);
260 if (bank->dbck_enable_mask) {
261 bank->context.debounce = debounce;
262 bank->context.debounce_en = val;
263 }
264 }
265
266 /**
267 * omap_clear_gpio_debounce - clear debounce settings for a gpio
268 * @bank: the gpio bank we're acting upon
269 * @gpio: the gpio number on this @gpio
270 *
271 * If a gpio is using debounce, then clear the debounce enable bit and if
272 * this is the only gpio in this bank using debounce, then clear the debounce
273 * time too. The debounce clock will also be disabled when calling this function
274 * if this is the only gpio in the bank using debounce.
275 */
276 static void omap_clear_gpio_debounce(struct gpio_bank *bank, unsigned gpio)
277 {
278 u32 gpio_bit = GPIO_BIT(bank, gpio);
279
280 if (!bank->dbck_flag)
281 return;
282
283 if (!(bank->dbck_enable_mask & gpio_bit))
284 return;
285
286 bank->dbck_enable_mask &= ~gpio_bit;
287 bank->context.debounce_en &= ~gpio_bit;
288 writel_relaxed(bank->context.debounce_en,
289 bank->base + bank->regs->debounce_en);
290
291 if (!bank->dbck_enable_mask) {
292 bank->context.debounce = 0;
293 writel_relaxed(bank->context.debounce, bank->base +
294 bank->regs->debounce);
295 clk_disable_unprepare(bank->dbck);
296 bank->dbck_enabled = false;
297 }
298 }
299
300 static inline void omap_set_gpio_trigger(struct gpio_bank *bank, int gpio,
301 unsigned trigger)
302 {
303 void __iomem *base = bank->base;
304 u32 gpio_bit = BIT(gpio);
305
306 omap_gpio_rmw(base, bank->regs->leveldetect0, gpio_bit,
307 trigger & IRQ_TYPE_LEVEL_LOW);
308 omap_gpio_rmw(base, bank->regs->leveldetect1, gpio_bit,
309 trigger & IRQ_TYPE_LEVEL_HIGH);
310 omap_gpio_rmw(base, bank->regs->risingdetect, gpio_bit,
311 trigger & IRQ_TYPE_EDGE_RISING);
312 omap_gpio_rmw(base, bank->regs->fallingdetect, gpio_bit,
313 trigger & IRQ_TYPE_EDGE_FALLING);
314
315 bank->context.leveldetect0 =
316 readl_relaxed(bank->base + bank->regs->leveldetect0);
317 bank->context.leveldetect1 =
318 readl_relaxed(bank->base + bank->regs->leveldetect1);
319 bank->context.risingdetect =
320 readl_relaxed(bank->base + bank->regs->risingdetect);
321 bank->context.fallingdetect =
322 readl_relaxed(bank->base + bank->regs->fallingdetect);
323
324 if (likely(!(bank->non_wakeup_gpios & gpio_bit))) {
325 omap_gpio_rmw(base, bank->regs->wkup_en, gpio_bit, trigger != 0);
326 bank->context.wake_en =
327 readl_relaxed(bank->base + bank->regs->wkup_en);
328 }
329
330 /* This part needs to be executed always for OMAP{34xx, 44xx} */
331 if (!bank->regs->irqctrl) {
332 /* On omap24xx proceed only when valid GPIO bit is set */
333 if (bank->non_wakeup_gpios) {
334 if (!(bank->non_wakeup_gpios & gpio_bit))
335 goto exit;
336 }
337
338 /*
339 * Log the edge gpio and manually trigger the IRQ
340 * after resume if the input level changes
341 * to avoid irq lost during PER RET/OFF mode
342 * Applies for omap2 non-wakeup gpio and all omap3 gpios
343 */
344 if (trigger & IRQ_TYPE_EDGE_BOTH)
345 bank->enabled_non_wakeup_gpios |= gpio_bit;
346 else
347 bank->enabled_non_wakeup_gpios &= ~gpio_bit;
348 }
349
350 exit:
351 bank->level_mask =
352 readl_relaxed(bank->base + bank->regs->leveldetect0) |
353 readl_relaxed(bank->base + bank->regs->leveldetect1);
354 }
355
356 #ifdef CONFIG_ARCH_OMAP1
357 /*
358 * This only applies to chips that can't do both rising and falling edge
359 * detection at once. For all other chips, this function is a noop.
360 */
361 static void omap_toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio)
362 {
363 void __iomem *reg = bank->base;
364 u32 l = 0;
365
366 if (!bank->regs->irqctrl)
367 return;
368
369 reg += bank->regs->irqctrl;
370
371 l = readl_relaxed(reg);
372 if ((l >> gpio) & 1)
373 l &= ~(BIT(gpio));
374 else
375 l |= BIT(gpio);
376
377 writel_relaxed(l, reg);
378 }
379 #else
380 static void omap_toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio) {}
381 #endif
382
383 static int omap_set_gpio_triggering(struct gpio_bank *bank, int gpio,
384 unsigned trigger)
385 {
386 void __iomem *reg = bank->base;
387 void __iomem *base = bank->base;
388 u32 l = 0;
389
390 if (bank->regs->leveldetect0 && bank->regs->wkup_en) {
391 omap_set_gpio_trigger(bank, gpio, trigger);
392 } else if (bank->regs->irqctrl) {
393 reg += bank->regs->irqctrl;
394
395 l = readl_relaxed(reg);
396 if ((trigger & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH)
397 bank->toggle_mask |= BIT(gpio);
398 if (trigger & IRQ_TYPE_EDGE_RISING)
399 l |= BIT(gpio);
400 else if (trigger & IRQ_TYPE_EDGE_FALLING)
401 l &= ~(BIT(gpio));
402 else
403 return -EINVAL;
404
405 writel_relaxed(l, reg);
406 } else if (bank->regs->edgectrl1) {
407 if (gpio & 0x08)
408 reg += bank->regs->edgectrl2;
409 else
410 reg += bank->regs->edgectrl1;
411
412 gpio &= 0x07;
413 l = readl_relaxed(reg);
414 l &= ~(3 << (gpio << 1));
415 if (trigger & IRQ_TYPE_EDGE_RISING)
416 l |= 2 << (gpio << 1);
417 if (trigger & IRQ_TYPE_EDGE_FALLING)
418 l |= BIT(gpio << 1);
419
420 /* Enable wake-up during idle for dynamic tick */
421 omap_gpio_rmw(base, bank->regs->wkup_en, BIT(gpio), trigger);
422 bank->context.wake_en =
423 readl_relaxed(bank->base + bank->regs->wkup_en);
424 writel_relaxed(l, reg);
425 }
426 return 0;
427 }
428
429 static void omap_enable_gpio_module(struct gpio_bank *bank, unsigned offset)
430 {
431 if (bank->regs->pinctrl) {
432 void __iomem *reg = bank->base + bank->regs->pinctrl;
433
434 /* Claim the pin for MPU */
435 writel_relaxed(readl_relaxed(reg) | (BIT(offset)), reg);
436 }
437
438 if (bank->regs->ctrl && !BANK_USED(bank)) {
439 void __iomem *reg = bank->base + bank->regs->ctrl;
440 u32 ctrl;
441
442 ctrl = readl_relaxed(reg);
443 /* Module is enabled, clocks are not gated */
444 ctrl &= ~GPIO_MOD_CTRL_BIT;
445 writel_relaxed(ctrl, reg);
446 bank->context.ctrl = ctrl;
447 }
448 }
449
450 static void omap_disable_gpio_module(struct gpio_bank *bank, unsigned offset)
451 {
452 void __iomem *base = bank->base;
453
454 if (bank->regs->wkup_en &&
455 !LINE_USED(bank->mod_usage, offset) &&
456 !LINE_USED(bank->irq_usage, offset)) {
457 /* Disable wake-up during idle for dynamic tick */
458 omap_gpio_rmw(base, bank->regs->wkup_en, BIT(offset), 0);
459 bank->context.wake_en =
460 readl_relaxed(bank->base + bank->regs->wkup_en);
461 }
462
463 if (bank->regs->ctrl && !BANK_USED(bank)) {
464 void __iomem *reg = bank->base + bank->regs->ctrl;
465 u32 ctrl;
466
467 ctrl = readl_relaxed(reg);
468 /* Module is disabled, clocks are gated */
469 ctrl |= GPIO_MOD_CTRL_BIT;
470 writel_relaxed(ctrl, reg);
471 bank->context.ctrl = ctrl;
472 }
473 }
474
475 static int omap_gpio_is_input(struct gpio_bank *bank, int mask)
476 {
477 void __iomem *reg = bank->base + bank->regs->direction;
478
479 return readl_relaxed(reg) & mask;
480 }
481
482 static void omap_gpio_init_irq(struct gpio_bank *bank, unsigned gpio,
483 unsigned offset)
484 {
485 if (!LINE_USED(bank->mod_usage, offset)) {
486 omap_enable_gpio_module(bank, offset);
487 omap_set_gpio_direction(bank, offset, 1);
488 }
489 bank->irq_usage |= BIT(GPIO_INDEX(bank, gpio));
490 }
491
492 static int omap_gpio_irq_type(struct irq_data *d, unsigned type)
493 {
494 struct gpio_bank *bank = omap_irq_data_get_bank(d);
495 unsigned gpio = 0;
496 int retval;
497 unsigned long flags;
498 unsigned offset;
499
500 if (!BANK_USED(bank))
501 pm_runtime_get_sync(bank->dev);
502
503 #ifdef CONFIG_ARCH_OMAP1
504 if (d->irq > IH_MPUIO_BASE)
505 gpio = OMAP_MPUIO(d->irq - IH_MPUIO_BASE);
506 #endif
507
508 if (!gpio)
509 gpio = omap_irq_to_gpio(bank, d->hwirq);
510
511 if (type & ~IRQ_TYPE_SENSE_MASK)
512 return -EINVAL;
513
514 if (!bank->regs->leveldetect0 &&
515 (type & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH)))
516 return -EINVAL;
517
518 spin_lock_irqsave(&bank->lock, flags);
519 offset = GPIO_INDEX(bank, gpio);
520 retval = omap_set_gpio_triggering(bank, offset, type);
521 omap_gpio_init_irq(bank, gpio, offset);
522 if (!omap_gpio_is_input(bank, BIT(offset))) {
523 spin_unlock_irqrestore(&bank->lock, flags);
524 return -EINVAL;
525 }
526 spin_unlock_irqrestore(&bank->lock, flags);
527
528 if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
529 __irq_set_handler_locked(d->irq, handle_level_irq);
530 else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
531 __irq_set_handler_locked(d->irq, handle_edge_irq);
532
533 return retval;
534 }
535
536 static void omap_clear_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
537 {
538 void __iomem *reg = bank->base;
539
540 reg += bank->regs->irqstatus;
541 writel_relaxed(gpio_mask, reg);
542
543 /* Workaround for clearing DSP GPIO interrupts to allow retention */
544 if (bank->regs->irqstatus2) {
545 reg = bank->base + bank->regs->irqstatus2;
546 writel_relaxed(gpio_mask, reg);
547 }
548
549 /* Flush posted write for the irq status to avoid spurious interrupts */
550 readl_relaxed(reg);
551 }
552
553 static inline void omap_clear_gpio_irqstatus(struct gpio_bank *bank, int gpio)
554 {
555 omap_clear_gpio_irqbank(bank, GPIO_BIT(bank, gpio));
556 }
557
558 static u32 omap_get_gpio_irqbank_mask(struct gpio_bank *bank)
559 {
560 void __iomem *reg = bank->base;
561 u32 l;
562 u32 mask = (BIT(bank->width)) - 1;
563
564 reg += bank->regs->irqenable;
565 l = readl_relaxed(reg);
566 if (bank->regs->irqenable_inv)
567 l = ~l;
568 l &= mask;
569 return l;
570 }
571
572 static void omap_enable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
573 {
574 void __iomem *reg = bank->base;
575 u32 l;
576
577 if (bank->regs->set_irqenable) {
578 reg += bank->regs->set_irqenable;
579 l = gpio_mask;
580 bank->context.irqenable1 |= gpio_mask;
581 } else {
582 reg += bank->regs->irqenable;
583 l = readl_relaxed(reg);
584 if (bank->regs->irqenable_inv)
585 l &= ~gpio_mask;
586 else
587 l |= gpio_mask;
588 bank->context.irqenable1 = l;
589 }
590
591 writel_relaxed(l, reg);
592 }
593
594 static void omap_disable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
595 {
596 void __iomem *reg = bank->base;
597 u32 l;
598
599 if (bank->regs->clr_irqenable) {
600 reg += bank->regs->clr_irqenable;
601 l = gpio_mask;
602 bank->context.irqenable1 &= ~gpio_mask;
603 } else {
604 reg += bank->regs->irqenable;
605 l = readl_relaxed(reg);
606 if (bank->regs->irqenable_inv)
607 l |= gpio_mask;
608 else
609 l &= ~gpio_mask;
610 bank->context.irqenable1 = l;
611 }
612
613 writel_relaxed(l, reg);
614 }
615
616 static inline void omap_set_gpio_irqenable(struct gpio_bank *bank, int gpio,
617 int enable)
618 {
619 if (enable)
620 omap_enable_gpio_irqbank(bank, GPIO_BIT(bank, gpio));
621 else
622 omap_disable_gpio_irqbank(bank, GPIO_BIT(bank, gpio));
623 }
624
625 /*
626 * Note that ENAWAKEUP needs to be enabled in GPIO_SYSCONFIG register.
627 * 1510 does not seem to have a wake-up register. If JTAG is connected
628 * to the target, system will wake up always on GPIO events. While
629 * system is running all registered GPIO interrupts need to have wake-up
630 * enabled. When system is suspended, only selected GPIO interrupts need
631 * to have wake-up enabled.
632 */
633 static int omap_set_gpio_wakeup(struct gpio_bank *bank, int gpio, int enable)
634 {
635 u32 gpio_bit = GPIO_BIT(bank, gpio);
636 unsigned long flags;
637
638 if (bank->non_wakeup_gpios & gpio_bit) {
639 dev_err(bank->dev,
640 "Unable to modify wakeup on non-wakeup GPIO%d\n", gpio);
641 return -EINVAL;
642 }
643
644 spin_lock_irqsave(&bank->lock, flags);
645 if (enable)
646 bank->context.wake_en |= gpio_bit;
647 else
648 bank->context.wake_en &= ~gpio_bit;
649
650 writel_relaxed(bank->context.wake_en, bank->base + bank->regs->wkup_en);
651 spin_unlock_irqrestore(&bank->lock, flags);
652
653 return 0;
654 }
655
656 static void omap_reset_gpio(struct gpio_bank *bank, int gpio)
657 {
658 omap_set_gpio_direction(bank, GPIO_INDEX(bank, gpio), 1);
659 omap_set_gpio_irqenable(bank, gpio, 0);
660 omap_clear_gpio_irqstatus(bank, gpio);
661 omap_set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), IRQ_TYPE_NONE);
662 omap_clear_gpio_debounce(bank, gpio);
663 }
664
665 /* Use disable_irq_wake() and enable_irq_wake() functions from drivers */
666 static int omap_gpio_wake_enable(struct irq_data *d, unsigned int enable)
667 {
668 struct gpio_bank *bank = omap_irq_data_get_bank(d);
669 unsigned int gpio = omap_irq_to_gpio(bank, d->hwirq);
670
671 return omap_set_gpio_wakeup(bank, gpio, enable);
672 }
673
674 static int omap_gpio_request(struct gpio_chip *chip, unsigned offset)
675 {
676 struct gpio_bank *bank = container_of(chip, struct gpio_bank, chip);
677 unsigned long flags;
678
679 /*
680 * If this is the first gpio_request for the bank,
681 * enable the bank module.
682 */
683 if (!BANK_USED(bank))
684 pm_runtime_get_sync(bank->dev);
685
686 spin_lock_irqsave(&bank->lock, flags);
687 /* Set trigger to none. You need to enable the desired trigger with
688 * request_irq() or set_irq_type(). Only do this if the IRQ line has
689 * not already been requested.
690 */
691 if (!LINE_USED(bank->irq_usage, offset)) {
692 omap_set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);
693 omap_enable_gpio_module(bank, offset);
694 }
695 bank->mod_usage |= BIT(offset);
696 spin_unlock_irqrestore(&bank->lock, flags);
697
698 return 0;
699 }
700
701 static void omap_gpio_free(struct gpio_chip *chip, unsigned offset)
702 {
703 struct gpio_bank *bank = container_of(chip, struct gpio_bank, chip);
704 unsigned long flags;
705
706 spin_lock_irqsave(&bank->lock, flags);
707 bank->mod_usage &= ~(BIT(offset));
708 omap_disable_gpio_module(bank, offset);
709 omap_reset_gpio(bank, bank->chip.base + offset);
710 spin_unlock_irqrestore(&bank->lock, flags);
711
712 /*
713 * If this is the last gpio to be freed in the bank,
714 * disable the bank module.
715 */
716 if (!BANK_USED(bank))
717 pm_runtime_put(bank->dev);
718 }
719
720 /*
721 * We need to unmask the GPIO bank interrupt as soon as possible to
722 * avoid missing GPIO interrupts for other lines in the bank.
723 * Then we need to mask-read-clear-unmask the triggered GPIO lines
724 * in the bank to avoid missing nested interrupts for a GPIO line.
725 * If we wait to unmask individual GPIO lines in the bank after the
726 * line's interrupt handler has been run, we may miss some nested
727 * interrupts.
728 */
729 static void omap_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
730 {
731 void __iomem *isr_reg = NULL;
732 u32 isr;
733 unsigned int bit;
734 struct gpio_bank *bank;
735 int unmasked = 0;
736 struct irq_chip *irqchip = irq_desc_get_chip(desc);
737 struct gpio_chip *chip = irq_get_handler_data(irq);
738
739 chained_irq_enter(irqchip, desc);
740
741 bank = container_of(chip, struct gpio_bank, chip);
742 isr_reg = bank->base + bank->regs->irqstatus;
743 pm_runtime_get_sync(bank->dev);
744
745 if (WARN_ON(!isr_reg))
746 goto exit;
747
748 while (1) {
749 u32 isr_saved, level_mask = 0;
750 u32 enabled;
751
752 enabled = omap_get_gpio_irqbank_mask(bank);
753 isr_saved = isr = readl_relaxed(isr_reg) & enabled;
754
755 if (bank->level_mask)
756 level_mask = bank->level_mask & enabled;
757
758 /* clear edge sensitive interrupts before handler(s) are
759 called so that we don't miss any interrupt occurred while
760 executing them */
761 omap_disable_gpio_irqbank(bank, isr_saved & ~level_mask);
762 omap_clear_gpio_irqbank(bank, isr_saved & ~level_mask);
763 omap_enable_gpio_irqbank(bank, isr_saved & ~level_mask);
764
765 /* if there is only edge sensitive GPIO pin interrupts
766 configured, we could unmask GPIO bank interrupt immediately */
767 if (!level_mask && !unmasked) {
768 unmasked = 1;
769 chained_irq_exit(irqchip, desc);
770 }
771
772 if (!isr)
773 break;
774
775 while (isr) {
776 bit = __ffs(isr);
777 isr &= ~(BIT(bit));
778
779 /*
780 * Some chips can't respond to both rising and falling
781 * at the same time. If this irq was requested with
782 * both flags, we need to flip the ICR data for the IRQ
783 * to respond to the IRQ for the opposite direction.
784 * This will be indicated in the bank toggle_mask.
785 */
786 if (bank->toggle_mask & (BIT(bit)))
787 omap_toggle_gpio_edge_triggering(bank, bit);
788
789 generic_handle_irq(irq_find_mapping(bank->chip.irqdomain,
790 bit));
791 }
792 }
793 /* if bank has any level sensitive GPIO pin interrupt
794 configured, we must unmask the bank interrupt only after
795 handler(s) are executed in order to avoid spurious bank
796 interrupt */
797 exit:
798 if (!unmasked)
799 chained_irq_exit(irqchip, desc);
800 pm_runtime_put(bank->dev);
801 }
802
803 static unsigned int omap_gpio_irq_startup(struct irq_data *d)
804 {
805 struct gpio_bank *bank = omap_irq_data_get_bank(d);
806 unsigned int gpio = omap_irq_to_gpio(bank, d->hwirq);
807 unsigned long flags;
808 unsigned offset = GPIO_INDEX(bank, gpio);
809
810 if (!BANK_USED(bank))
811 pm_runtime_get_sync(bank->dev);
812
813 spin_lock_irqsave(&bank->lock, flags);
814 omap_gpio_init_irq(bank, gpio, offset);
815 spin_unlock_irqrestore(&bank->lock, flags);
816 omap_gpio_unmask_irq(d);
817
818 return 0;
819 }
820
821 static void omap_gpio_irq_shutdown(struct irq_data *d)
822 {
823 struct gpio_bank *bank = omap_irq_data_get_bank(d);
824 unsigned int gpio = omap_irq_to_gpio(bank, d->hwirq);
825 unsigned long flags;
826 unsigned offset = GPIO_INDEX(bank, gpio);
827
828 spin_lock_irqsave(&bank->lock, flags);
829 gpiochip_unlock_as_irq(&bank->chip, offset);
830 bank->irq_usage &= ~(BIT(offset));
831 omap_disable_gpio_module(bank, offset);
832 omap_reset_gpio(bank, gpio);
833 spin_unlock_irqrestore(&bank->lock, flags);
834
835 /*
836 * If this is the last IRQ to be freed in the bank,
837 * disable the bank module.
838 */
839 if (!BANK_USED(bank))
840 pm_runtime_put(bank->dev);
841 }
842
843 static void omap_gpio_ack_irq(struct irq_data *d)
844 {
845 struct gpio_bank *bank = omap_irq_data_get_bank(d);
846 unsigned int gpio = omap_irq_to_gpio(bank, d->hwirq);
847
848 omap_clear_gpio_irqstatus(bank, gpio);
849 }
850
851 static void omap_gpio_mask_irq(struct irq_data *d)
852 {
853 struct gpio_bank *bank = omap_irq_data_get_bank(d);
854 unsigned int gpio = omap_irq_to_gpio(bank, d->hwirq);
855 unsigned long flags;
856
857 spin_lock_irqsave(&bank->lock, flags);
858 omap_set_gpio_irqenable(bank, gpio, 0);
859 omap_set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), IRQ_TYPE_NONE);
860 spin_unlock_irqrestore(&bank->lock, flags);
861 }
862
863 static void omap_gpio_unmask_irq(struct irq_data *d)
864 {
865 struct gpio_bank *bank = omap_irq_data_get_bank(d);
866 unsigned int gpio = omap_irq_to_gpio(bank, d->hwirq);
867 unsigned int irq_mask = GPIO_BIT(bank, gpio);
868 u32 trigger = irqd_get_trigger_type(d);
869 unsigned long flags;
870
871 spin_lock_irqsave(&bank->lock, flags);
872 if (trigger)
873 omap_set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), trigger);
874
875 /* For level-triggered GPIOs, the clearing must be done after
876 * the HW source is cleared, thus after the handler has run */
877 if (bank->level_mask & irq_mask) {
878 omap_set_gpio_irqenable(bank, gpio, 0);
879 omap_clear_gpio_irqstatus(bank, gpio);
880 }
881
882 omap_set_gpio_irqenable(bank, gpio, 1);
883 spin_unlock_irqrestore(&bank->lock, flags);
884 }
885
886 /*---------------------------------------------------------------------*/
887
888 static int omap_mpuio_suspend_noirq(struct device *dev)
889 {
890 struct platform_device *pdev = to_platform_device(dev);
891 struct gpio_bank *bank = platform_get_drvdata(pdev);
892 void __iomem *mask_reg = bank->base +
893 OMAP_MPUIO_GPIO_MASKIT / bank->stride;
894 unsigned long flags;
895
896 spin_lock_irqsave(&bank->lock, flags);
897 writel_relaxed(0xffff & ~bank->context.wake_en, mask_reg);
898 spin_unlock_irqrestore(&bank->lock, flags);
899
900 return 0;
901 }
902
903 static int omap_mpuio_resume_noirq(struct device *dev)
904 {
905 struct platform_device *pdev = to_platform_device(dev);
906 struct gpio_bank *bank = platform_get_drvdata(pdev);
907 void __iomem *mask_reg = bank->base +
908 OMAP_MPUIO_GPIO_MASKIT / bank->stride;
909 unsigned long flags;
910
911 spin_lock_irqsave(&bank->lock, flags);
912 writel_relaxed(bank->context.wake_en, mask_reg);
913 spin_unlock_irqrestore(&bank->lock, flags);
914
915 return 0;
916 }
917
918 static const struct dev_pm_ops omap_mpuio_dev_pm_ops = {
919 .suspend_noirq = omap_mpuio_suspend_noirq,
920 .resume_noirq = omap_mpuio_resume_noirq,
921 };
922
923 /* use platform_driver for this. */
924 static struct platform_driver omap_mpuio_driver = {
925 .driver = {
926 .name = "mpuio",
927 .pm = &omap_mpuio_dev_pm_ops,
928 },
929 };
930
931 static struct platform_device omap_mpuio_device = {
932 .name = "mpuio",
933 .id = -1,
934 .dev = {
935 .driver = &omap_mpuio_driver.driver,
936 }
937 /* could list the /proc/iomem resources */
938 };
939
940 static inline void omap_mpuio_init(struct gpio_bank *bank)
941 {
942 platform_set_drvdata(&omap_mpuio_device, bank);
943
944 if (platform_driver_register(&omap_mpuio_driver) == 0)
945 (void) platform_device_register(&omap_mpuio_device);
946 }
947
948 /*---------------------------------------------------------------------*/
949
950 static int omap_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
951 {
952 struct gpio_bank *bank;
953 unsigned long flags;
954 void __iomem *reg;
955 int dir;
956
957 bank = container_of(chip, struct gpio_bank, chip);
958 reg = bank->base + bank->regs->direction;
959 spin_lock_irqsave(&bank->lock, flags);
960 dir = !!(readl_relaxed(reg) & BIT(offset));
961 spin_unlock_irqrestore(&bank->lock, flags);
962 return dir;
963 }
964
965 static int omap_gpio_input(struct gpio_chip *chip, unsigned offset)
966 {
967 struct gpio_bank *bank;
968 unsigned long flags;
969
970 bank = container_of(chip, struct gpio_bank, chip);
971 spin_lock_irqsave(&bank->lock, flags);
972 omap_set_gpio_direction(bank, offset, 1);
973 spin_unlock_irqrestore(&bank->lock, flags);
974 return 0;
975 }
976
977 static int omap_gpio_get(struct gpio_chip *chip, unsigned offset)
978 {
979 struct gpio_bank *bank;
980 u32 mask;
981
982 bank = container_of(chip, struct gpio_bank, chip);
983 mask = (BIT(offset));
984
985 if (omap_gpio_is_input(bank, mask))
986 return omap_get_gpio_datain(bank, offset);
987 else
988 return omap_get_gpio_dataout(bank, offset);
989 }
990
991 static int omap_gpio_output(struct gpio_chip *chip, unsigned offset, int value)
992 {
993 struct gpio_bank *bank;
994 unsigned long flags;
995
996 bank = container_of(chip, struct gpio_bank, chip);
997 spin_lock_irqsave(&bank->lock, flags);
998 bank->set_dataout(bank, offset, value);
999 omap_set_gpio_direction(bank, offset, 0);
1000 spin_unlock_irqrestore(&bank->lock, flags);
1001 return 0;
1002 }
1003
1004 static int omap_gpio_debounce(struct gpio_chip *chip, unsigned offset,
1005 unsigned debounce)
1006 {
1007 struct gpio_bank *bank;
1008 unsigned long flags;
1009
1010 bank = container_of(chip, struct gpio_bank, chip);
1011
1012 spin_lock_irqsave(&bank->lock, flags);
1013 omap2_set_gpio_debounce(bank, offset, debounce);
1014 spin_unlock_irqrestore(&bank->lock, flags);
1015
1016 return 0;
1017 }
1018
1019 static void omap_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
1020 {
1021 struct gpio_bank *bank;
1022 unsigned long flags;
1023
1024 bank = container_of(chip, struct gpio_bank, chip);
1025 spin_lock_irqsave(&bank->lock, flags);
1026 bank->set_dataout(bank, offset, value);
1027 spin_unlock_irqrestore(&bank->lock, flags);
1028 }
1029
1030 /*---------------------------------------------------------------------*/
1031
1032 static void __init omap_gpio_show_rev(struct gpio_bank *bank)
1033 {
1034 static bool called;
1035 u32 rev;
1036
1037 if (called || bank->regs->revision == USHRT_MAX)
1038 return;
1039
1040 rev = readw_relaxed(bank->base + bank->regs->revision);
1041 pr_info("OMAP GPIO hardware version %d.%d\n",
1042 (rev >> 4) & 0x0f, rev & 0x0f);
1043
1044 called = true;
1045 }
1046
1047 static void omap_gpio_mod_init(struct gpio_bank *bank)
1048 {
1049 void __iomem *base = bank->base;
1050 u32 l = 0xffffffff;
1051
1052 if (bank->width == 16)
1053 l = 0xffff;
1054
1055 if (bank->is_mpuio) {
1056 writel_relaxed(l, bank->base + bank->regs->irqenable);
1057 return;
1058 }
1059
1060 omap_gpio_rmw(base, bank->regs->irqenable, l,
1061 bank->regs->irqenable_inv);
1062 omap_gpio_rmw(base, bank->regs->irqstatus, l,
1063 !bank->regs->irqenable_inv);
1064 if (bank->regs->debounce_en)
1065 writel_relaxed(0, base + bank->regs->debounce_en);
1066
1067 /* Save OE default value (0xffffffff) in the context */
1068 bank->context.oe = readl_relaxed(bank->base + bank->regs->direction);
1069 /* Initialize interface clk ungated, module enabled */
1070 if (bank->regs->ctrl)
1071 writel_relaxed(0, base + bank->regs->ctrl);
1072
1073 bank->dbck = clk_get(bank->dev, "dbclk");
1074 if (IS_ERR(bank->dbck))
1075 dev_err(bank->dev, "Could not get gpio dbck\n");
1076 }
1077
1078 static void
1079 omap_mpuio_alloc_gc(struct gpio_bank *bank, unsigned int irq_start,
1080 unsigned int num)
1081 {
1082 struct irq_chip_generic *gc;
1083 struct irq_chip_type *ct;
1084
1085 gc = irq_alloc_generic_chip("MPUIO", 1, irq_start, bank->base,
1086 handle_simple_irq);
1087 if (!gc) {
1088 dev_err(bank->dev, "Memory alloc failed for gc\n");
1089 return;
1090 }
1091
1092 ct = gc->chip_types;
1093
1094 /* NOTE: No ack required, reading IRQ status clears it. */
1095 ct->chip.irq_mask = irq_gc_mask_set_bit;
1096 ct->chip.irq_unmask = irq_gc_mask_clr_bit;
1097 ct->chip.irq_set_type = omap_gpio_irq_type;
1098
1099 if (bank->regs->wkup_en)
1100 ct->chip.irq_set_wake = omap_gpio_wake_enable;
1101
1102 ct->regs.mask = OMAP_MPUIO_GPIO_INT / bank->stride;
1103 irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE,
1104 IRQ_NOREQUEST | IRQ_NOPROBE, 0);
1105 }
1106
1107 static int omap_gpio_chip_init(struct gpio_bank *bank, struct irq_chip *irqc)
1108 {
1109 int j;
1110 static int gpio;
1111 int irq_base = 0;
1112 int ret;
1113
1114 /*
1115 * REVISIT eventually switch from OMAP-specific gpio structs
1116 * over to the generic ones
1117 */
1118 bank->chip.request = omap_gpio_request;
1119 bank->chip.free = omap_gpio_free;
1120 bank->chip.get_direction = omap_gpio_get_direction;
1121 bank->chip.direction_input = omap_gpio_input;
1122 bank->chip.get = omap_gpio_get;
1123 bank->chip.direction_output = omap_gpio_output;
1124 bank->chip.set_debounce = omap_gpio_debounce;
1125 bank->chip.set = omap_gpio_set;
1126 if (bank->is_mpuio) {
1127 bank->chip.label = "mpuio";
1128 if (bank->regs->wkup_en)
1129 bank->chip.dev = &omap_mpuio_device.dev;
1130 bank->chip.base = OMAP_MPUIO(0);
1131 } else {
1132 bank->chip.label = "gpio";
1133 bank->chip.base = gpio;
1134 gpio += bank->width;
1135 }
1136 bank->chip.ngpio = bank->width;
1137
1138 ret = gpiochip_add(&bank->chip);
1139 if (ret) {
1140 dev_err(bank->dev, "Could not register gpio chip %d\n", ret);
1141 return ret;
1142 }
1143
1144 #ifdef CONFIG_ARCH_OMAP1
1145 /*
1146 * REVISIT: Once we have OMAP1 supporting SPARSE_IRQ, we can drop
1147 * irq_alloc_descs() since a base IRQ offset will no longer be needed.
1148 */
1149 irq_base = irq_alloc_descs(-1, 0, bank->width, 0);
1150 if (irq_base < 0) {
1151 dev_err(bank->dev, "Couldn't allocate IRQ numbers\n");
1152 return -ENODEV;
1153 }
1154 #endif
1155
1156 ret = gpiochip_irqchip_add(&bank->chip, irqc,
1157 irq_base, omap_gpio_irq_handler,
1158 IRQ_TYPE_NONE);
1159
1160 if (ret) {
1161 dev_err(bank->dev, "Couldn't add irqchip to gpiochip %d\n", ret);
1162 gpiochip_remove(&bank->chip);
1163 return -ENODEV;
1164 }
1165
1166 gpiochip_set_chained_irqchip(&bank->chip, irqc,
1167 bank->irq, omap_gpio_irq_handler);
1168
1169 for (j = 0; j < bank->width; j++) {
1170 int irq = irq_find_mapping(bank->chip.irqdomain, j);
1171 if (bank->is_mpuio) {
1172 omap_mpuio_alloc_gc(bank, irq, bank->width);
1173 irq_set_chip_and_handler(irq, NULL, NULL);
1174 set_irq_flags(irq, 0);
1175 }
1176 }
1177
1178 return 0;
1179 }
1180
1181 static const struct of_device_id omap_gpio_match[];
1182
1183 static int omap_gpio_probe(struct platform_device *pdev)
1184 {
1185 struct device *dev = &pdev->dev;
1186 struct device_node *node = dev->of_node;
1187 const struct of_device_id *match;
1188 const struct omap_gpio_platform_data *pdata;
1189 struct resource *res;
1190 struct gpio_bank *bank;
1191 struct irq_chip *irqc;
1192 int ret;
1193
1194 match = of_match_device(of_match_ptr(omap_gpio_match), dev);
1195
1196 pdata = match ? match->data : dev_get_platdata(dev);
1197 if (!pdata)
1198 return -EINVAL;
1199
1200 bank = devm_kzalloc(dev, sizeof(struct gpio_bank), GFP_KERNEL);
1201 if (!bank) {
1202 dev_err(dev, "Memory alloc failed\n");
1203 return -ENOMEM;
1204 }
1205
1206 irqc = devm_kzalloc(dev, sizeof(*irqc), GFP_KERNEL);
1207 if (!irqc)
1208 return -ENOMEM;
1209
1210 irqc->irq_startup = omap_gpio_irq_startup,
1211 irqc->irq_shutdown = omap_gpio_irq_shutdown,
1212 irqc->irq_ack = omap_gpio_ack_irq,
1213 irqc->irq_mask = omap_gpio_mask_irq,
1214 irqc->irq_unmask = omap_gpio_unmask_irq,
1215 irqc->irq_set_type = omap_gpio_irq_type,
1216 irqc->irq_set_wake = omap_gpio_wake_enable,
1217 irqc->name = dev_name(&pdev->dev);
1218
1219 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1220 if (unlikely(!res)) {
1221 dev_err(dev, "Invalid IRQ resource\n");
1222 return -ENODEV;
1223 }
1224
1225 bank->irq = res->start;
1226 bank->dev = dev;
1227 bank->chip.dev = dev;
1228 bank->dbck_flag = pdata->dbck_flag;
1229 bank->stride = pdata->bank_stride;
1230 bank->width = pdata->bank_width;
1231 bank->is_mpuio = pdata->is_mpuio;
1232 bank->non_wakeup_gpios = pdata->non_wakeup_gpios;
1233 bank->regs = pdata->regs;
1234 #ifdef CONFIG_OF_GPIO
1235 bank->chip.of_node = of_node_get(node);
1236 #endif
1237 if (node) {
1238 if (!of_property_read_bool(node, "ti,gpio-always-on"))
1239 bank->loses_context = true;
1240 } else {
1241 bank->loses_context = pdata->loses_context;
1242
1243 if (bank->loses_context)
1244 bank->get_context_loss_count =
1245 pdata->get_context_loss_count;
1246 }
1247
1248 if (bank->regs->set_dataout && bank->regs->clr_dataout)
1249 bank->set_dataout = omap_set_gpio_dataout_reg;
1250 else
1251 bank->set_dataout = omap_set_gpio_dataout_mask;
1252
1253 spin_lock_init(&bank->lock);
1254
1255 /* Static mapping, never released */
1256 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1257 bank->base = devm_ioremap_resource(dev, res);
1258 if (IS_ERR(bank->base)) {
1259 irq_domain_remove(bank->chip.irqdomain);
1260 return PTR_ERR(bank->base);
1261 }
1262
1263 platform_set_drvdata(pdev, bank);
1264
1265 pm_runtime_enable(bank->dev);
1266 pm_runtime_irq_safe(bank->dev);
1267 pm_runtime_get_sync(bank->dev);
1268
1269 if (bank->is_mpuio)
1270 omap_mpuio_init(bank);
1271
1272 omap_gpio_mod_init(bank);
1273
1274 ret = omap_gpio_chip_init(bank, irqc);
1275 if (ret)
1276 return ret;
1277
1278 omap_gpio_show_rev(bank);
1279
1280 pm_runtime_put(bank->dev);
1281
1282 list_add_tail(&bank->node, &omap_gpio_list);
1283
1284 return 0;
1285 }
1286
1287 #ifdef CONFIG_ARCH_OMAP2PLUS
1288
1289 #if defined(CONFIG_PM)
1290 static void omap_gpio_restore_context(struct gpio_bank *bank);
1291
1292 static int omap_gpio_runtime_suspend(struct device *dev)
1293 {
1294 struct platform_device *pdev = to_platform_device(dev);
1295 struct gpio_bank *bank = platform_get_drvdata(pdev);
1296 u32 l1 = 0, l2 = 0;
1297 unsigned long flags;
1298 u32 wake_low, wake_hi;
1299
1300 spin_lock_irqsave(&bank->lock, flags);
1301
1302 /*
1303 * Only edges can generate a wakeup event to the PRCM.
1304 *
1305 * Therefore, ensure any wake-up capable GPIOs have
1306 * edge-detection enabled before going idle to ensure a wakeup
1307 * to the PRCM is generated on a GPIO transition. (c.f. 34xx
1308 * NDA TRM 25.5.3.1)
1309 *
1310 * The normal values will be restored upon ->runtime_resume()
1311 * by writing back the values saved in bank->context.
1312 */
1313 wake_low = bank->context.leveldetect0 & bank->context.wake_en;
1314 if (wake_low)
1315 writel_relaxed(wake_low | bank->context.fallingdetect,
1316 bank->base + bank->regs->fallingdetect);
1317 wake_hi = bank->context.leveldetect1 & bank->context.wake_en;
1318 if (wake_hi)
1319 writel_relaxed(wake_hi | bank->context.risingdetect,
1320 bank->base + bank->regs->risingdetect);
1321
1322 if (!bank->enabled_non_wakeup_gpios)
1323 goto update_gpio_context_count;
1324
1325 if (bank->power_mode != OFF_MODE) {
1326 bank->power_mode = 0;
1327 goto update_gpio_context_count;
1328 }
1329 /*
1330 * If going to OFF, remove triggering for all
1331 * non-wakeup GPIOs. Otherwise spurious IRQs will be
1332 * generated. See OMAP2420 Errata item 1.101.
1333 */
1334 bank->saved_datain = readl_relaxed(bank->base +
1335 bank->regs->datain);
1336 l1 = bank->context.fallingdetect;
1337 l2 = bank->context.risingdetect;
1338
1339 l1 &= ~bank->enabled_non_wakeup_gpios;
1340 l2 &= ~bank->enabled_non_wakeup_gpios;
1341
1342 writel_relaxed(l1, bank->base + bank->regs->fallingdetect);
1343 writel_relaxed(l2, bank->base + bank->regs->risingdetect);
1344
1345 bank->workaround_enabled = true;
1346
1347 update_gpio_context_count:
1348 if (bank->get_context_loss_count)
1349 bank->context_loss_count =
1350 bank->get_context_loss_count(bank->dev);
1351
1352 omap_gpio_dbck_disable(bank);
1353 spin_unlock_irqrestore(&bank->lock, flags);
1354
1355 return 0;
1356 }
1357
1358 static void omap_gpio_init_context(struct gpio_bank *p);
1359
1360 static int omap_gpio_runtime_resume(struct device *dev)
1361 {
1362 struct platform_device *pdev = to_platform_device(dev);
1363 struct gpio_bank *bank = platform_get_drvdata(pdev);
1364 u32 l = 0, gen, gen0, gen1;
1365 unsigned long flags;
1366 int c;
1367
1368 spin_lock_irqsave(&bank->lock, flags);
1369
1370 /*
1371 * On the first resume during the probe, the context has not
1372 * been initialised and so initialise it now. Also initialise
1373 * the context loss count.
1374 */
1375 if (bank->loses_context && !bank->context_valid) {
1376 omap_gpio_init_context(bank);
1377
1378 if (bank->get_context_loss_count)
1379 bank->context_loss_count =
1380 bank->get_context_loss_count(bank->dev);
1381 }
1382
1383 omap_gpio_dbck_enable(bank);
1384
1385 /*
1386 * In ->runtime_suspend(), level-triggered, wakeup-enabled
1387 * GPIOs were set to edge trigger also in order to be able to
1388 * generate a PRCM wakeup. Here we restore the
1389 * pre-runtime_suspend() values for edge triggering.
1390 */
1391 writel_relaxed(bank->context.fallingdetect,
1392 bank->base + bank->regs->fallingdetect);
1393 writel_relaxed(bank->context.risingdetect,
1394 bank->base + bank->regs->risingdetect);
1395
1396 if (bank->loses_context) {
1397 if (!bank->get_context_loss_count) {
1398 omap_gpio_restore_context(bank);
1399 } else {
1400 c = bank->get_context_loss_count(bank->dev);
1401 if (c != bank->context_loss_count) {
1402 omap_gpio_restore_context(bank);
1403 } else {
1404 spin_unlock_irqrestore(&bank->lock, flags);
1405 return 0;
1406 }
1407 }
1408 }
1409
1410 if (!bank->workaround_enabled) {
1411 spin_unlock_irqrestore(&bank->lock, flags);
1412 return 0;
1413 }
1414
1415 l = readl_relaxed(bank->base + bank->regs->datain);
1416
1417 /*
1418 * Check if any of the non-wakeup interrupt GPIOs have changed
1419 * state. If so, generate an IRQ by software. This is
1420 * horribly racy, but it's the best we can do to work around
1421 * this silicon bug.
1422 */
1423 l ^= bank->saved_datain;
1424 l &= bank->enabled_non_wakeup_gpios;
1425
1426 /*
1427 * No need to generate IRQs for the rising edge for gpio IRQs
1428 * configured with falling edge only; and vice versa.
1429 */
1430 gen0 = l & bank->context.fallingdetect;
1431 gen0 &= bank->saved_datain;
1432
1433 gen1 = l & bank->context.risingdetect;
1434 gen1 &= ~(bank->saved_datain);
1435
1436 /* FIXME: Consider GPIO IRQs with level detections properly! */
1437 gen = l & (~(bank->context.fallingdetect) &
1438 ~(bank->context.risingdetect));
1439 /* Consider all GPIO IRQs needed to be updated */
1440 gen |= gen0 | gen1;
1441
1442 if (gen) {
1443 u32 old0, old1;
1444
1445 old0 = readl_relaxed(bank->base + bank->regs->leveldetect0);
1446 old1 = readl_relaxed(bank->base + bank->regs->leveldetect1);
1447
1448 if (!bank->regs->irqstatus_raw0) {
1449 writel_relaxed(old0 | gen, bank->base +
1450 bank->regs->leveldetect0);
1451 writel_relaxed(old1 | gen, bank->base +
1452 bank->regs->leveldetect1);
1453 }
1454
1455 if (bank->regs->irqstatus_raw0) {
1456 writel_relaxed(old0 | l, bank->base +
1457 bank->regs->leveldetect0);
1458 writel_relaxed(old1 | l, bank->base +
1459 bank->regs->leveldetect1);
1460 }
1461 writel_relaxed(old0, bank->base + bank->regs->leveldetect0);
1462 writel_relaxed(old1, bank->base + bank->regs->leveldetect1);
1463 }
1464
1465 bank->workaround_enabled = false;
1466 spin_unlock_irqrestore(&bank->lock, flags);
1467
1468 return 0;
1469 }
1470 #endif /* CONFIG_PM */
1471
1472 void omap2_gpio_prepare_for_idle(int pwr_mode)
1473 {
1474 struct gpio_bank *bank;
1475
1476 list_for_each_entry(bank, &omap_gpio_list, node) {
1477 if (!BANK_USED(bank) || !bank->loses_context)
1478 continue;
1479
1480 bank->power_mode = pwr_mode;
1481
1482 pm_runtime_put_sync_suspend(bank->dev);
1483 }
1484 }
1485
1486 void omap2_gpio_resume_after_idle(void)
1487 {
1488 struct gpio_bank *bank;
1489
1490 list_for_each_entry(bank, &omap_gpio_list, node) {
1491 if (!BANK_USED(bank) || !bank->loses_context)
1492 continue;
1493
1494 pm_runtime_get_sync(bank->dev);
1495 }
1496 }
1497
1498 #if defined(CONFIG_PM)
1499 static void omap_gpio_init_context(struct gpio_bank *p)
1500 {
1501 struct omap_gpio_reg_offs *regs = p->regs;
1502 void __iomem *base = p->base;
1503
1504 p->context.ctrl = readl_relaxed(base + regs->ctrl);
1505 p->context.oe = readl_relaxed(base + regs->direction);
1506 p->context.wake_en = readl_relaxed(base + regs->wkup_en);
1507 p->context.leveldetect0 = readl_relaxed(base + regs->leveldetect0);
1508 p->context.leveldetect1 = readl_relaxed(base + regs->leveldetect1);
1509 p->context.risingdetect = readl_relaxed(base + regs->risingdetect);
1510 p->context.fallingdetect = readl_relaxed(base + regs->fallingdetect);
1511 p->context.irqenable1 = readl_relaxed(base + regs->irqenable);
1512 p->context.irqenable2 = readl_relaxed(base + regs->irqenable2);
1513
1514 if (regs->set_dataout && p->regs->clr_dataout)
1515 p->context.dataout = readl_relaxed(base + regs->set_dataout);
1516 else
1517 p->context.dataout = readl_relaxed(base + regs->dataout);
1518
1519 p->context_valid = true;
1520 }
1521
1522 static void omap_gpio_restore_context(struct gpio_bank *bank)
1523 {
1524 writel_relaxed(bank->context.wake_en,
1525 bank->base + bank->regs->wkup_en);
1526 writel_relaxed(bank->context.ctrl, bank->base + bank->regs->ctrl);
1527 writel_relaxed(bank->context.leveldetect0,
1528 bank->base + bank->regs->leveldetect0);
1529 writel_relaxed(bank->context.leveldetect1,
1530 bank->base + bank->regs->leveldetect1);
1531 writel_relaxed(bank->context.risingdetect,
1532 bank->base + bank->regs->risingdetect);
1533 writel_relaxed(bank->context.fallingdetect,
1534 bank->base + bank->regs->fallingdetect);
1535 if (bank->regs->set_dataout && bank->regs->clr_dataout)
1536 writel_relaxed(bank->context.dataout,
1537 bank->base + bank->regs->set_dataout);
1538 else
1539 writel_relaxed(bank->context.dataout,
1540 bank->base + bank->regs->dataout);
1541 writel_relaxed(bank->context.oe, bank->base + bank->regs->direction);
1542
1543 if (bank->dbck_enable_mask) {
1544 writel_relaxed(bank->context.debounce, bank->base +
1545 bank->regs->debounce);
1546 writel_relaxed(bank->context.debounce_en,
1547 bank->base + bank->regs->debounce_en);
1548 }
1549
1550 writel_relaxed(bank->context.irqenable1,
1551 bank->base + bank->regs->irqenable);
1552 writel_relaxed(bank->context.irqenable2,
1553 bank->base + bank->regs->irqenable2);
1554 }
1555 #endif /* CONFIG_PM */
1556 #else
1557 #define omap_gpio_runtime_suspend NULL
1558 #define omap_gpio_runtime_resume NULL
1559 static inline void omap_gpio_init_context(struct gpio_bank *p) {}
1560 #endif
1561
1562 static const struct dev_pm_ops gpio_pm_ops = {
1563 SET_RUNTIME_PM_OPS(omap_gpio_runtime_suspend, omap_gpio_runtime_resume,
1564 NULL)
1565 };
1566
1567 #if defined(CONFIG_OF)
1568 static struct omap_gpio_reg_offs omap2_gpio_regs = {
1569 .revision = OMAP24XX_GPIO_REVISION,
1570 .direction = OMAP24XX_GPIO_OE,
1571 .datain = OMAP24XX_GPIO_DATAIN,
1572 .dataout = OMAP24XX_GPIO_DATAOUT,
1573 .set_dataout = OMAP24XX_GPIO_SETDATAOUT,
1574 .clr_dataout = OMAP24XX_GPIO_CLEARDATAOUT,
1575 .irqstatus = OMAP24XX_GPIO_IRQSTATUS1,
1576 .irqstatus2 = OMAP24XX_GPIO_IRQSTATUS2,
1577 .irqenable = OMAP24XX_GPIO_IRQENABLE1,
1578 .irqenable2 = OMAP24XX_GPIO_IRQENABLE2,
1579 .set_irqenable = OMAP24XX_GPIO_SETIRQENABLE1,
1580 .clr_irqenable = OMAP24XX_GPIO_CLEARIRQENABLE1,
1581 .debounce = OMAP24XX_GPIO_DEBOUNCE_VAL,
1582 .debounce_en = OMAP24XX_GPIO_DEBOUNCE_EN,
1583 .ctrl = OMAP24XX_GPIO_CTRL,
1584 .wkup_en = OMAP24XX_GPIO_WAKE_EN,
1585 .leveldetect0 = OMAP24XX_GPIO_LEVELDETECT0,
1586 .leveldetect1 = OMAP24XX_GPIO_LEVELDETECT1,
1587 .risingdetect = OMAP24XX_GPIO_RISINGDETECT,
1588 .fallingdetect = OMAP24XX_GPIO_FALLINGDETECT,
1589 };
1590
1591 static struct omap_gpio_reg_offs omap4_gpio_regs = {
1592 .revision = OMAP4_GPIO_REVISION,
1593 .direction = OMAP4_GPIO_OE,
1594 .datain = OMAP4_GPIO_DATAIN,
1595 .dataout = OMAP4_GPIO_DATAOUT,
1596 .set_dataout = OMAP4_GPIO_SETDATAOUT,
1597 .clr_dataout = OMAP4_GPIO_CLEARDATAOUT,
1598 .irqstatus = OMAP4_GPIO_IRQSTATUS0,
1599 .irqstatus2 = OMAP4_GPIO_IRQSTATUS1,
1600 .irqenable = OMAP4_GPIO_IRQSTATUSSET0,
1601 .irqenable2 = OMAP4_GPIO_IRQSTATUSSET1,
1602 .set_irqenable = OMAP4_GPIO_IRQSTATUSSET0,
1603 .clr_irqenable = OMAP4_GPIO_IRQSTATUSCLR0,
1604 .debounce = OMAP4_GPIO_DEBOUNCINGTIME,
1605 .debounce_en = OMAP4_GPIO_DEBOUNCENABLE,
1606 .ctrl = OMAP4_GPIO_CTRL,
1607 .wkup_en = OMAP4_GPIO_IRQWAKEN0,
1608 .leveldetect0 = OMAP4_GPIO_LEVELDETECT0,
1609 .leveldetect1 = OMAP4_GPIO_LEVELDETECT1,
1610 .risingdetect = OMAP4_GPIO_RISINGDETECT,
1611 .fallingdetect = OMAP4_GPIO_FALLINGDETECT,
1612 };
1613
1614 static const struct omap_gpio_platform_data omap2_pdata = {
1615 .regs = &omap2_gpio_regs,
1616 .bank_width = 32,
1617 .dbck_flag = false,
1618 };
1619
1620 static const struct omap_gpio_platform_data omap3_pdata = {
1621 .regs = &omap2_gpio_regs,
1622 .bank_width = 32,
1623 .dbck_flag = true,
1624 };
1625
1626 static const struct omap_gpio_platform_data omap4_pdata = {
1627 .regs = &omap4_gpio_regs,
1628 .bank_width = 32,
1629 .dbck_flag = true,
1630 };
1631
1632 static const struct of_device_id omap_gpio_match[] = {
1633 {
1634 .compatible = "ti,omap4-gpio",
1635 .data = &omap4_pdata,
1636 },
1637 {
1638 .compatible = "ti,omap3-gpio",
1639 .data = &omap3_pdata,
1640 },
1641 {
1642 .compatible = "ti,omap2-gpio",
1643 .data = &omap2_pdata,
1644 },
1645 { },
1646 };
1647 MODULE_DEVICE_TABLE(of, omap_gpio_match);
1648 #endif
1649
1650 static struct platform_driver omap_gpio_driver = {
1651 .probe = omap_gpio_probe,
1652 .driver = {
1653 .name = "omap_gpio",
1654 .pm = &gpio_pm_ops,
1655 .of_match_table = of_match_ptr(omap_gpio_match),
1656 },
1657 };
1658
1659 /*
1660 * gpio driver register needs to be done before
1661 * machine_init functions access gpio APIs.
1662 * Hence omap_gpio_drv_reg() is a postcore_initcall.
1663 */
1664 static int __init omap_gpio_drv_reg(void)
1665 {
1666 return platform_driver_register(&omap_gpio_driver);
1667 }
1668 postcore_initcall(omap_gpio_drv_reg);
Ubuntu Artful kernel mirror