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n_tty: Reduce branching in canon_copy_from_read_buf()
[linux/fpc-iii.git] / drivers / gpio / gpio-omap.c
blobf7fbb46d5d797a32d9d35c119adb3df2166cc37e
1 /*
2 * Support functions for OMAP GPIO
3 *
4 * Copyright (C) 2003-2005 Nokia Corporation
5 * Written by Juha Yrjölä <juha.yrjola@nokia.com>
6 *
7 * Copyright (C) 2009 Texas Instruments
8 * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 */
14
15 #include <linux/init.h>
16 #include <linux/module.h>
17 #include <linux/interrupt.h>
18 #include <linux/syscore_ops.h>
19 #include <linux/err.h>
20 #include <linux/clk.h>
21 #include <linux/io.h>
22 #include <linux/device.h>
23 #include <linux/pm_runtime.h>
24 #include <linux/pm.h>
25 #include <linux/of.h>
26 #include <linux/of_device.h>
27 #include <linux/gpio.h>
28 #include <linux/bitops.h>
29 #include <linux/platform_data/gpio-omap.h>
30
31 #define OFF_MODE 1
32 #define OMAP4_GPIO_DEBOUNCINGTIME_MASK 0xFF
33
34 static LIST_HEAD(omap_gpio_list);
35
36 struct gpio_regs {
37 u32 irqenable1;
38 u32 irqenable2;
39 u32 wake_en;
40 u32 ctrl;
41 u32 oe;
42 u32 leveldetect0;
43 u32 leveldetect1;
44 u32 risingdetect;
45 u32 fallingdetect;
46 u32 dataout;
47 u32 debounce;
48 u32 debounce_en;
49 };
50
51 struct gpio_bank {
52 struct list_head node;
53 void __iomem *base;
54 int irq;
55 u32 non_wakeup_gpios;
56 u32 enabled_non_wakeup_gpios;
57 struct gpio_regs context;
58 u32 saved_datain;
59 u32 level_mask;
60 u32 toggle_mask;
61 raw_spinlock_t lock;
62 raw_spinlock_t wa_lock;
63 struct gpio_chip chip;
64 struct clk *dbck;
65 u32 mod_usage;
66 u32 irq_usage;
67 u32 dbck_enable_mask;
68 bool dbck_enabled;
69 struct device *dev;
70 bool is_mpuio;
71 bool dbck_flag;
72 bool loses_context;
73 bool context_valid;
74 int stride;
75 u32 width;
76 int context_loss_count;
77 int power_mode;
78 bool workaround_enabled;
79
80 void (*set_dataout)(struct gpio_bank *bank, unsigned gpio, int enable);
81 int (*get_context_loss_count)(struct device *dev);
82
83 struct omap_gpio_reg_offs *regs;
84 };
85
86 #define GPIO_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 inline struct gpio_bank *omap_irq_data_get_bank(struct irq_data *d)
94 {
95 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
96 return container_of(chip, struct gpio_bank, chip);
97 }
98
99 static void omap_set_gpio_direction(struct gpio_bank *bank, int gpio,
100 int is_input)
101 {
102 void __iomem *reg = bank->base;
103 u32 l;
104
105 reg += bank->regs->direction;
106 l = readl_relaxed(reg);
107 if (is_input)
108 l |= BIT(gpio);
109 else
110 l &= ~(BIT(gpio));
111 writel_relaxed(l, reg);
112 bank->context.oe = l;
113 }
114
115
116 /* set data out value using dedicate set/clear register */
117 static void omap_set_gpio_dataout_reg(struct gpio_bank *bank, unsigned offset,
118 int enable)
119 {
120 void __iomem *reg = bank->base;
121 u32 l = BIT(offset);
122
123 if (enable) {
124 reg += bank->regs->set_dataout;
125 bank->context.dataout |= l;
126 } else {
127 reg += bank->regs->clr_dataout;
128 bank->context.dataout &= ~l;
129 }
130
131 writel_relaxed(l, reg);
132 }
133
134 /* set data out value using mask register */
135 static void omap_set_gpio_dataout_mask(struct gpio_bank *bank, unsigned offset,
136 int enable)
137 {
138 void __iomem *reg = bank->base + bank->regs->dataout;
139 u32 gpio_bit = BIT(offset);
140 u32 l;
141
142 l = readl_relaxed(reg);
143 if (enable)
144 l |= gpio_bit;
145 else
146 l &= ~gpio_bit;
147 writel_relaxed(l, reg);
148 bank->context.dataout = l;
149 }
150
151 static int omap_get_gpio_datain(struct gpio_bank *bank, int offset)
152 {
153 void __iomem *reg = bank->base + bank->regs->datain;
154
155 return (readl_relaxed(reg) & (BIT(offset))) != 0;
156 }
157
158 static int omap_get_gpio_dataout(struct gpio_bank *bank, int offset)
159 {
160 void __iomem *reg = bank->base + bank->regs->dataout;
161
162 return (readl_relaxed(reg) & (BIT(offset))) != 0;
163 }
164
165 static inline void omap_gpio_rmw(void __iomem *base, u32 reg, u32 mask, bool set)
166 {
167 int l = readl_relaxed(base + reg);
168
169 if (set)
170 l |= mask;
171 else
172 l &= ~mask;
173
174 writel_relaxed(l, base + reg);
175 }
176
177 static inline void omap_gpio_dbck_enable(struct gpio_bank *bank)
178 {
179 if (bank->dbck_enable_mask && !bank->dbck_enabled) {
180 clk_enable(bank->dbck);
181 bank->dbck_enabled = true;
182
183 writel_relaxed(bank->dbck_enable_mask,
184 bank->base + bank->regs->debounce_en);
185 }
186 }
187
188 static inline void omap_gpio_dbck_disable(struct gpio_bank *bank)
189 {
190 if (bank->dbck_enable_mask && bank->dbck_enabled) {
191 /*
192 * Disable debounce before cutting it's clock. If debounce is
193 * enabled but the clock is not, GPIO module seems to be unable
194 * to detect events and generate interrupts at least on OMAP3.
195 */
196 writel_relaxed(0, bank->base + bank->regs->debounce_en);
197
198 clk_disable(bank->dbck);
199 bank->dbck_enabled = false;
200 }
201 }
202
203 /**
204 * omap2_set_gpio_debounce - low level gpio debounce time
205 * @bank: the gpio bank we're acting upon
206 * @offset: the gpio number on this @bank
207 * @debounce: debounce time to use
208 *
209 * OMAP's debounce time is in 31us steps
210 * <debounce time> = (GPIO_DEBOUNCINGTIME[7:0].DEBOUNCETIME + 1) x 31
211 * so we need to convert and round up to the closest unit.
212 */
213 static void omap2_set_gpio_debounce(struct gpio_bank *bank, unsigned offset,
214 unsigned debounce)
215 {
216 void __iomem *reg;
217 u32 val;
218 u32 l;
219 bool enable = !!debounce;
220
221 if (!bank->dbck_flag)
222 return;
223
224 if (enable) {
225 debounce = DIV_ROUND_UP(debounce, 31) - 1;
226 debounce &= OMAP4_GPIO_DEBOUNCINGTIME_MASK;
227 }
228
229 l = BIT(offset);
230
231 clk_enable(bank->dbck);
232 reg = bank->base + bank->regs->debounce;
233 writel_relaxed(debounce, reg);
234
235 reg = bank->base + bank->regs->debounce_en;
236 val = readl_relaxed(reg);
237
238 if (enable)
239 val |= l;
240 else
241 val &= ~l;
242 bank->dbck_enable_mask = val;
243
244 writel_relaxed(val, reg);
245 clk_disable(bank->dbck);
246 /*
247 * Enable debounce clock per module.
248 * This call is mandatory because in omap_gpio_request() when
249 * *_runtime_get_sync() is called, _gpio_dbck_enable() within
250 * runtime callbck fails to turn on dbck because dbck_enable_mask
251 * used within _gpio_dbck_enable() is still not initialized at
252 * that point. Therefore we have to enable dbck here.
253 */
254 omap_gpio_dbck_enable(bank);
255 if (bank->dbck_enable_mask) {
256 bank->context.debounce = debounce;
257 bank->context.debounce_en = val;
258 }
259 }
260
261 /**
262 * omap_clear_gpio_debounce - clear debounce settings for a gpio
263 * @bank: the gpio bank we're acting upon
264 * @offset: the gpio number on this @bank
265 *
266 * If a gpio is using debounce, then clear the debounce enable bit and if
267 * this is the only gpio in this bank using debounce, then clear the debounce
268 * time too. The debounce clock will also be disabled when calling this function
269 * if this is the only gpio in the bank using debounce.
270 */
271 static void omap_clear_gpio_debounce(struct gpio_bank *bank, unsigned offset)
272 {
273 u32 gpio_bit = BIT(offset);
274
275 if (!bank->dbck_flag)
276 return;
277
278 if (!(bank->dbck_enable_mask & gpio_bit))
279 return;
280
281 bank->dbck_enable_mask &= ~gpio_bit;
282 bank->context.debounce_en &= ~gpio_bit;
283 writel_relaxed(bank->context.debounce_en,
284 bank->base + bank->regs->debounce_en);
285
286 if (!bank->dbck_enable_mask) {
287 bank->context.debounce = 0;
288 writel_relaxed(bank->context.debounce, bank->base +
289 bank->regs->debounce);
290 clk_disable(bank->dbck);
291 bank->dbck_enabled = false;
292 }
293 }
294
295 static inline void omap_set_gpio_trigger(struct gpio_bank *bank, int gpio,
296 unsigned trigger)
297 {
298 void __iomem *base = bank->base;
299 u32 gpio_bit = BIT(gpio);
300
301 omap_gpio_rmw(base, bank->regs->leveldetect0, gpio_bit,
302 trigger & IRQ_TYPE_LEVEL_LOW);
303 omap_gpio_rmw(base, bank->regs->leveldetect1, gpio_bit,
304 trigger & IRQ_TYPE_LEVEL_HIGH);
305 omap_gpio_rmw(base, bank->regs->risingdetect, gpio_bit,
306 trigger & IRQ_TYPE_EDGE_RISING);
307 omap_gpio_rmw(base, bank->regs->fallingdetect, gpio_bit,
308 trigger & IRQ_TYPE_EDGE_FALLING);
309
310 bank->context.leveldetect0 =
311 readl_relaxed(bank->base + bank->regs->leveldetect0);
312 bank->context.leveldetect1 =
313 readl_relaxed(bank->base + bank->regs->leveldetect1);
314 bank->context.risingdetect =
315 readl_relaxed(bank->base + bank->regs->risingdetect);
316 bank->context.fallingdetect =
317 readl_relaxed(bank->base + bank->regs->fallingdetect);
318
319 if (likely(!(bank->non_wakeup_gpios & gpio_bit))) {
320 omap_gpio_rmw(base, bank->regs->wkup_en, gpio_bit, trigger != 0);
321 bank->context.wake_en =
322 readl_relaxed(bank->base + bank->regs->wkup_en);
323 }
324
325 /* This part needs to be executed always for OMAP{34xx, 44xx} */
326 if (!bank->regs->irqctrl) {
327 /* On omap24xx proceed only when valid GPIO bit is set */
328 if (bank->non_wakeup_gpios) {
329 if (!(bank->non_wakeup_gpios & gpio_bit))
330 goto exit;
331 }
332
333 /*
334 * Log the edge gpio and manually trigger the IRQ
335 * after resume if the input level changes
336 * to avoid irq lost during PER RET/OFF mode
337 * Applies for omap2 non-wakeup gpio and all omap3 gpios
338 */
339 if (trigger & IRQ_TYPE_EDGE_BOTH)
340 bank->enabled_non_wakeup_gpios |= gpio_bit;
341 else
342 bank->enabled_non_wakeup_gpios &= ~gpio_bit;
343 }
344
345 exit:
346 bank->level_mask =
347 readl_relaxed(bank->base + bank->regs->leveldetect0) |
348 readl_relaxed(bank->base + bank->regs->leveldetect1);
349 }
350
351 #ifdef CONFIG_ARCH_OMAP1
352 /*
353 * This only applies to chips that can't do both rising and falling edge
354 * detection at once. For all other chips, this function is a noop.
355 */
356 static void omap_toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio)
357 {
358 void __iomem *reg = bank->base;
359 u32 l = 0;
360
361 if (!bank->regs->irqctrl)
362 return;
363
364 reg += bank->regs->irqctrl;
365
366 l = readl_relaxed(reg);
367 if ((l >> gpio) & 1)
368 l &= ~(BIT(gpio));
369 else
370 l |= BIT(gpio);
371
372 writel_relaxed(l, reg);
373 }
374 #else
375 static void omap_toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio) {}
376 #endif
377
378 static int omap_set_gpio_triggering(struct gpio_bank *bank, int gpio,
379 unsigned trigger)
380 {
381 void __iomem *reg = bank->base;
382 void __iomem *base = bank->base;
383 u32 l = 0;
384
385 if (bank->regs->leveldetect0 && bank->regs->wkup_en) {
386 omap_set_gpio_trigger(bank, gpio, trigger);
387 } else if (bank->regs->irqctrl) {
388 reg += bank->regs->irqctrl;
389
390 l = readl_relaxed(reg);
391 if ((trigger & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH)
392 bank->toggle_mask |= BIT(gpio);
393 if (trigger & IRQ_TYPE_EDGE_RISING)
394 l |= BIT(gpio);
395 else if (trigger & IRQ_TYPE_EDGE_FALLING)
396 l &= ~(BIT(gpio));
397 else
398 return -EINVAL;
399
400 writel_relaxed(l, reg);
401 } else if (bank->regs->edgectrl1) {
402 if (gpio & 0x08)
403 reg += bank->regs->edgectrl2;
404 else
405 reg += bank->regs->edgectrl1;
406
407 gpio &= 0x07;
408 l = readl_relaxed(reg);
409 l &= ~(3 << (gpio << 1));
410 if (trigger & IRQ_TYPE_EDGE_RISING)
411 l |= 2 << (gpio << 1);
412 if (trigger & IRQ_TYPE_EDGE_FALLING)
413 l |= BIT(gpio << 1);
414
415 /* Enable wake-up during idle for dynamic tick */
416 omap_gpio_rmw(base, bank->regs->wkup_en, BIT(gpio), trigger);
417 bank->context.wake_en =
418 readl_relaxed(bank->base + bank->regs->wkup_en);
419 writel_relaxed(l, reg);
420 }
421 return 0;
422 }
423
424 static void omap_enable_gpio_module(struct gpio_bank *bank, unsigned offset)
425 {
426 if (bank->regs->pinctrl) {
427 void __iomem *reg = bank->base + bank->regs->pinctrl;
428
429 /* Claim the pin for MPU */
430 writel_relaxed(readl_relaxed(reg) | (BIT(offset)), reg);
431 }
432
433 if (bank->regs->ctrl && !BANK_USED(bank)) {
434 void __iomem *reg = bank->base + bank->regs->ctrl;
435 u32 ctrl;
436
437 ctrl = readl_relaxed(reg);
438 /* Module is enabled, clocks are not gated */
439 ctrl &= ~GPIO_MOD_CTRL_BIT;
440 writel_relaxed(ctrl, reg);
441 bank->context.ctrl = ctrl;
442 }
443 }
444
445 static void omap_disable_gpio_module(struct gpio_bank *bank, unsigned offset)
446 {
447 void __iomem *base = bank->base;
448
449 if (bank->regs->wkup_en &&
450 !LINE_USED(bank->mod_usage, offset) &&
451 !LINE_USED(bank->irq_usage, offset)) {
452 /* Disable wake-up during idle for dynamic tick */
453 omap_gpio_rmw(base, bank->regs->wkup_en, BIT(offset), 0);
454 bank->context.wake_en =
455 readl_relaxed(bank->base + bank->regs->wkup_en);
456 }
457
458 if (bank->regs->ctrl && !BANK_USED(bank)) {
459 void __iomem *reg = bank->base + bank->regs->ctrl;
460 u32 ctrl;
461
462 ctrl = readl_relaxed(reg);
463 /* Module is disabled, clocks are gated */
464 ctrl |= GPIO_MOD_CTRL_BIT;
465 writel_relaxed(ctrl, reg);
466 bank->context.ctrl = ctrl;
467 }
468 }
469
470 static int omap_gpio_is_input(struct gpio_bank *bank, unsigned offset)
471 {
472 void __iomem *reg = bank->base + bank->regs->direction;
473
474 return readl_relaxed(reg) & BIT(offset);
475 }
476
477 static void omap_gpio_init_irq(struct gpio_bank *bank, unsigned offset)
478 {
479 if (!LINE_USED(bank->mod_usage, offset)) {
480 omap_enable_gpio_module(bank, offset);
481 omap_set_gpio_direction(bank, offset, 1);
482 }
483 bank->irq_usage |= BIT(offset);
484 }
485
486 static int omap_gpio_irq_type(struct irq_data *d, unsigned type)
487 {
488 struct gpio_bank *bank = omap_irq_data_get_bank(d);
489 int retval;
490 unsigned long flags;
491 unsigned offset = d->hwirq;
492
493 if (type & ~IRQ_TYPE_SENSE_MASK)
494 return -EINVAL;
495
496 if (!bank->regs->leveldetect0 &&
497 (type & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH)))
498 return -EINVAL;
499
500 raw_spin_lock_irqsave(&bank->lock, flags);
501 retval = omap_set_gpio_triggering(bank, offset, type);
502 if (retval) {
503 raw_spin_unlock_irqrestore(&bank->lock, flags);
504 goto error;
505 }
506 omap_gpio_init_irq(bank, offset);
507 if (!omap_gpio_is_input(bank, offset)) {
508 raw_spin_unlock_irqrestore(&bank->lock, flags);
509 retval = -EINVAL;
510 goto error;
511 }
512 raw_spin_unlock_irqrestore(&bank->lock, flags);
513
514 if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
515 irq_set_handler_locked(d, handle_level_irq);
516 else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
517 irq_set_handler_locked(d, handle_edge_irq);
518
519 return 0;
520
521 error:
522 return retval;
523 }
524
525 static void omap_clear_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
526 {
527 void __iomem *reg = bank->base;
528
529 reg += bank->regs->irqstatus;
530 writel_relaxed(gpio_mask, reg);
531
532 /* Workaround for clearing DSP GPIO interrupts to allow retention */
533 if (bank->regs->irqstatus2) {
534 reg = bank->base + bank->regs->irqstatus2;
535 writel_relaxed(gpio_mask, reg);
536 }
537
538 /* Flush posted write for the irq status to avoid spurious interrupts */
539 readl_relaxed(reg);
540 }
541
542 static inline void omap_clear_gpio_irqstatus(struct gpio_bank *bank,
543 unsigned offset)
544 {
545 omap_clear_gpio_irqbank(bank, BIT(offset));
546 }
547
548 static u32 omap_get_gpio_irqbank_mask(struct gpio_bank *bank)
549 {
550 void __iomem *reg = bank->base;
551 u32 l;
552 u32 mask = (BIT(bank->width)) - 1;
553
554 reg += bank->regs->irqenable;
555 l = readl_relaxed(reg);
556 if (bank->regs->irqenable_inv)
557 l = ~l;
558 l &= mask;
559 return l;
560 }
561
562 static void omap_enable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
563 {
564 void __iomem *reg = bank->base;
565 u32 l;
566
567 if (bank->regs->set_irqenable) {
568 reg += bank->regs->set_irqenable;
569 l = gpio_mask;
570 bank->context.irqenable1 |= gpio_mask;
571 } else {
572 reg += bank->regs->irqenable;
573 l = readl_relaxed(reg);
574 if (bank->regs->irqenable_inv)
575 l &= ~gpio_mask;
576 else
577 l |= gpio_mask;
578 bank->context.irqenable1 = l;
579 }
580
581 writel_relaxed(l, reg);
582 }
583
584 static void omap_disable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
585 {
586 void __iomem *reg = bank->base;
587 u32 l;
588
589 if (bank->regs->clr_irqenable) {
590 reg += bank->regs->clr_irqenable;
591 l = gpio_mask;
592 bank->context.irqenable1 &= ~gpio_mask;
593 } else {
594 reg += bank->regs->irqenable;
595 l = readl_relaxed(reg);
596 if (bank->regs->irqenable_inv)
597 l |= gpio_mask;
598 else
599 l &= ~gpio_mask;
600 bank->context.irqenable1 = l;
601 }
602
603 writel_relaxed(l, reg);
604 }
605
606 static inline void omap_set_gpio_irqenable(struct gpio_bank *bank,
607 unsigned offset, int enable)
608 {
609 if (enable)
610 omap_enable_gpio_irqbank(bank, BIT(offset));
611 else
612 omap_disable_gpio_irqbank(bank, BIT(offset));
613 }
614
615 /*
616 * Note that ENAWAKEUP needs to be enabled in GPIO_SYSCONFIG register.
617 * 1510 does not seem to have a wake-up register. If JTAG is connected
618 * to the target, system will wake up always on GPIO events. While
619 * system is running all registered GPIO interrupts need to have wake-up
620 * enabled. When system is suspended, only selected GPIO interrupts need
621 * to have wake-up enabled.
622 */
623 static int omap_set_gpio_wakeup(struct gpio_bank *bank, unsigned offset,
624 int enable)
625 {
626 u32 gpio_bit = BIT(offset);
627 unsigned long flags;
628
629 if (bank->non_wakeup_gpios & gpio_bit) {
630 dev_err(bank->dev,
631 "Unable to modify wakeup on non-wakeup GPIO%d\n",
632 offset);
633 return -EINVAL;
634 }
635
636 raw_spin_lock_irqsave(&bank->lock, flags);
637 if (enable)
638 bank->context.wake_en |= gpio_bit;
639 else
640 bank->context.wake_en &= ~gpio_bit;
641
642 writel_relaxed(bank->context.wake_en, bank->base + bank->regs->wkup_en);
643 raw_spin_unlock_irqrestore(&bank->lock, flags);
644
645 return 0;
646 }
647
648 /* Use disable_irq_wake() and enable_irq_wake() functions from drivers */
649 static int omap_gpio_wake_enable(struct irq_data *d, unsigned int enable)
650 {
651 struct gpio_bank *bank = omap_irq_data_get_bank(d);
652 unsigned offset = d->hwirq;
653 int ret;
654
655 ret = omap_set_gpio_wakeup(bank, offset, enable);
656 if (!ret)
657 ret = irq_set_irq_wake(bank->irq, enable);
658
659 return ret;
660 }
661
662 static int omap_gpio_request(struct gpio_chip *chip, unsigned offset)
663 {
664 struct gpio_bank *bank = container_of(chip, struct gpio_bank, chip);
665 unsigned long flags;
666
667 /*
668 * If this is the first gpio_request for the bank,
669 * enable the bank module.
670 */
671 if (!BANK_USED(bank))
672 pm_runtime_get_sync(bank->dev);
673
674 raw_spin_lock_irqsave(&bank->lock, flags);
675 omap_enable_gpio_module(bank, offset);
676 bank->mod_usage |= BIT(offset);
677 raw_spin_unlock_irqrestore(&bank->lock, flags);
678
679 return 0;
680 }
681
682 static void omap_gpio_free(struct gpio_chip *chip, unsigned offset)
683 {
684 struct gpio_bank *bank = container_of(chip, struct gpio_bank, chip);
685 unsigned long flags;
686
687 raw_spin_lock_irqsave(&bank->lock, flags);
688 bank->mod_usage &= ~(BIT(offset));
689 if (!LINE_USED(bank->irq_usage, offset)) {
690 omap_set_gpio_direction(bank, offset, 1);
691 omap_clear_gpio_debounce(bank, offset);
692 }
693 omap_disable_gpio_module(bank, offset);
694 raw_spin_unlock_irqrestore(&bank->lock, flags);
695
696 /*
697 * If this is the last gpio to be freed in the bank,
698 * disable the bank module.
699 */
700 if (!BANK_USED(bank))
701 pm_runtime_put(bank->dev);
702 }
703
704 /*
705 * We need to unmask the GPIO bank interrupt as soon as possible to
706 * avoid missing GPIO interrupts for other lines in the bank.
707 * Then we need to mask-read-clear-unmask the triggered GPIO lines
708 * in the bank to avoid missing nested interrupts for a GPIO line.
709 * If we wait to unmask individual GPIO lines in the bank after the
710 * line's interrupt handler has been run, we may miss some nested
711 * interrupts.
712 */
713 static irqreturn_t omap_gpio_irq_handler(int irq, void *gpiobank)
714 {
715 void __iomem *isr_reg = NULL;
716 u32 isr;
717 unsigned int bit;
718 struct gpio_bank *bank = gpiobank;
719 unsigned long wa_lock_flags;
720 unsigned long lock_flags;
721
722 isr_reg = bank->base + bank->regs->irqstatus;
723 if (WARN_ON(!isr_reg))
724 goto exit;
725
726 pm_runtime_get_sync(bank->dev);
727
728 while (1) {
729 u32 isr_saved, level_mask = 0;
730 u32 enabled;
731
732 raw_spin_lock_irqsave(&bank->lock, lock_flags);
733
734 enabled = omap_get_gpio_irqbank_mask(bank);
735 isr_saved = isr = readl_relaxed(isr_reg) & enabled;
736
737 if (bank->level_mask)
738 level_mask = bank->level_mask & enabled;
739
740 /* clear edge sensitive interrupts before handler(s) are
741 called so that we don't miss any interrupt occurred while
742 executing them */
743 omap_disable_gpio_irqbank(bank, isr_saved & ~level_mask);
744 omap_clear_gpio_irqbank(bank, isr_saved & ~level_mask);
745 omap_enable_gpio_irqbank(bank, isr_saved & ~level_mask);
746
747 raw_spin_unlock_irqrestore(&bank->lock, lock_flags);
748
749 if (!isr)
750 break;
751
752 while (isr) {
753 bit = __ffs(isr);
754 isr &= ~(BIT(bit));
755
756 raw_spin_lock_irqsave(&bank->lock, lock_flags);
757 /*
758 * Some chips can't respond to both rising and falling
759 * at the same time. If this irq was requested with
760 * both flags, we need to flip the ICR data for the IRQ
761 * to respond to the IRQ for the opposite direction.
762 * This will be indicated in the bank toggle_mask.
763 */
764 if (bank->toggle_mask & (BIT(bit)))
765 omap_toggle_gpio_edge_triggering(bank, bit);
766
767 raw_spin_unlock_irqrestore(&bank->lock, lock_flags);
768
769 raw_spin_lock_irqsave(&bank->wa_lock, wa_lock_flags);
770
771 generic_handle_irq(irq_find_mapping(bank->chip.irqdomain,
772 bit));
773
774 raw_spin_unlock_irqrestore(&bank->wa_lock,
775 wa_lock_flags);
776 }
777 }
778 exit:
779 pm_runtime_put(bank->dev);
780 return IRQ_HANDLED;
781 }
782
783 static unsigned int omap_gpio_irq_startup(struct irq_data *d)
784 {
785 struct gpio_bank *bank = omap_irq_data_get_bank(d);
786 unsigned long flags;
787 unsigned offset = d->hwirq;
788
789 raw_spin_lock_irqsave(&bank->lock, flags);
790
791 if (!LINE_USED(bank->mod_usage, offset))
792 omap_set_gpio_direction(bank, offset, 1);
793 else if (!omap_gpio_is_input(bank, offset))
794 goto err;
795 omap_enable_gpio_module(bank, offset);
796 bank->irq_usage |= BIT(offset);
797
798 raw_spin_unlock_irqrestore(&bank->lock, flags);
799 omap_gpio_unmask_irq(d);
800
801 return 0;
802 err:
803 raw_spin_unlock_irqrestore(&bank->lock, flags);
804 return -EINVAL;
805 }
806
807 static void omap_gpio_irq_shutdown(struct irq_data *d)
808 {
809 struct gpio_bank *bank = omap_irq_data_get_bank(d);
810 unsigned long flags;
811 unsigned offset = d->hwirq;
812
813 raw_spin_lock_irqsave(&bank->lock, flags);
814 bank->irq_usage &= ~(BIT(offset));
815 omap_set_gpio_irqenable(bank, offset, 0);
816 omap_clear_gpio_irqstatus(bank, offset);
817 omap_set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);
818 if (!LINE_USED(bank->mod_usage, offset))
819 omap_clear_gpio_debounce(bank, offset);
820 omap_disable_gpio_module(bank, offset);
821 raw_spin_unlock_irqrestore(&bank->lock, flags);
822 }
823
824 static void omap_gpio_irq_bus_lock(struct irq_data *data)
825 {
826 struct gpio_bank *bank = omap_irq_data_get_bank(data);
827
828 if (!BANK_USED(bank))
829 pm_runtime_get_sync(bank->dev);
830 }
831
832 static void gpio_irq_bus_sync_unlock(struct irq_data *data)
833 {
834 struct gpio_bank *bank = omap_irq_data_get_bank(data);
835
836 /*
837 * If this is the last IRQ to be freed in the bank,
838 * disable the bank module.
839 */
840 if (!BANK_USED(bank))
841 pm_runtime_put(bank->dev);
842 }
843
844 static void omap_gpio_ack_irq(struct irq_data *d)
845 {
846 struct gpio_bank *bank = omap_irq_data_get_bank(d);
847 unsigned offset = d->hwirq;
848
849 omap_clear_gpio_irqstatus(bank, offset);
850 }
851
852 static void omap_gpio_mask_irq(struct irq_data *d)
853 {
854 struct gpio_bank *bank = omap_irq_data_get_bank(d);
855 unsigned offset = d->hwirq;
856 unsigned long flags;
857
858 raw_spin_lock_irqsave(&bank->lock, flags);
859 omap_set_gpio_irqenable(bank, offset, 0);
860 omap_set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);
861 raw_spin_unlock_irqrestore(&bank->lock, flags);
862 }
863
864 static void omap_gpio_unmask_irq(struct irq_data *d)
865 {
866 struct gpio_bank *bank = omap_irq_data_get_bank(d);
867 unsigned offset = d->hwirq;
868 u32 trigger = irqd_get_trigger_type(d);
869 unsigned long flags;
870
871 raw_spin_lock_irqsave(&bank->lock, flags);
872 if (trigger)
873 omap_set_gpio_triggering(bank, offset, 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 & BIT(offset)) {
878 omap_set_gpio_irqenable(bank, offset, 0);
879 omap_clear_gpio_irqstatus(bank, offset);
880 }
881
882 omap_set_gpio_irqenable(bank, offset, 1);
883 raw_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 raw_spin_lock_irqsave(&bank->lock, flags);
897 writel_relaxed(0xffff & ~bank->context.wake_en, mask_reg);
898 raw_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 raw_spin_lock_irqsave(&bank->lock, flags);
912 writel_relaxed(bank->context.wake_en, mask_reg);
913 raw_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 raw_spin_lock_irqsave(&bank->lock, flags);
960 dir = !!(readl_relaxed(reg) & BIT(offset));
961 raw_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 raw_spin_lock_irqsave(&bank->lock, flags);
972 omap_set_gpio_direction(bank, offset, 1);
973 raw_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
981 bank = container_of(chip, struct gpio_bank, chip);
982
983 if (omap_gpio_is_input(bank, offset))
984 return omap_get_gpio_datain(bank, offset);
985 else
986 return omap_get_gpio_dataout(bank, offset);
987 }
988
989 static int omap_gpio_output(struct gpio_chip *chip, unsigned offset, int value)
990 {
991 struct gpio_bank *bank;
992 unsigned long flags;
993
994 bank = container_of(chip, struct gpio_bank, chip);
995 raw_spin_lock_irqsave(&bank->lock, flags);
996 bank->set_dataout(bank, offset, value);
997 omap_set_gpio_direction(bank, offset, 0);
998 raw_spin_unlock_irqrestore(&bank->lock, flags);
999 return 0;
1000 }
1001
1002 static int omap_gpio_debounce(struct gpio_chip *chip, unsigned offset,
1003 unsigned debounce)
1004 {
1005 struct gpio_bank *bank;
1006 unsigned long flags;
1007
1008 bank = container_of(chip, struct gpio_bank, chip);
1009
1010 raw_spin_lock_irqsave(&bank->lock, flags);
1011 omap2_set_gpio_debounce(bank, offset, debounce);
1012 raw_spin_unlock_irqrestore(&bank->lock, flags);
1013
1014 return 0;
1015 }
1016
1017 static void omap_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
1018 {
1019 struct gpio_bank *bank;
1020 unsigned long flags;
1021
1022 bank = container_of(chip, struct gpio_bank, chip);
1023 raw_spin_lock_irqsave(&bank->lock, flags);
1024 bank->set_dataout(bank, offset, value);
1025 raw_spin_unlock_irqrestore(&bank->lock, flags);
1026 }
1027
1028 /*---------------------------------------------------------------------*/
1029
1030 static void __init omap_gpio_show_rev(struct gpio_bank *bank)
1031 {
1032 static bool called;
1033 u32 rev;
1034
1035 if (called || bank->regs->revision == USHRT_MAX)
1036 return;
1037
1038 rev = readw_relaxed(bank->base + bank->regs->revision);
1039 pr_info("OMAP GPIO hardware version %d.%d\n",
1040 (rev >> 4) & 0x0f, rev & 0x0f);
1041
1042 called = true;
1043 }
1044
1045 static void omap_gpio_mod_init(struct gpio_bank *bank)
1046 {
1047 void __iomem *base = bank->base;
1048 u32 l = 0xffffffff;
1049
1050 if (bank->width == 16)
1051 l = 0xffff;
1052
1053 if (bank->is_mpuio) {
1054 writel_relaxed(l, bank->base + bank->regs->irqenable);
1055 return;
1056 }
1057
1058 omap_gpio_rmw(base, bank->regs->irqenable, l,
1059 bank->regs->irqenable_inv);
1060 omap_gpio_rmw(base, bank->regs->irqstatus, l,
1061 !bank->regs->irqenable_inv);
1062 if (bank->regs->debounce_en)
1063 writel_relaxed(0, base + bank->regs->debounce_en);
1064
1065 /* Save OE default value (0xffffffff) in the context */
1066 bank->context.oe = readl_relaxed(bank->base + bank->regs->direction);
1067 /* Initialize interface clk ungated, module enabled */
1068 if (bank->regs->ctrl)
1069 writel_relaxed(0, base + bank->regs->ctrl);
1070 }
1071
1072 static int omap_gpio_chip_init(struct gpio_bank *bank, struct irq_chip *irqc)
1073 {
1074 static int gpio;
1075 int irq_base = 0;
1076 int ret;
1077
1078 /*
1079 * REVISIT eventually switch from OMAP-specific gpio structs
1080 * over to the generic ones
1081 */
1082 bank->chip.request = omap_gpio_request;
1083 bank->chip.free = omap_gpio_free;
1084 bank->chip.get_direction = omap_gpio_get_direction;
1085 bank->chip.direction_input = omap_gpio_input;
1086 bank->chip.get = omap_gpio_get;
1087 bank->chip.direction_output = omap_gpio_output;
1088 bank->chip.set_debounce = omap_gpio_debounce;
1089 bank->chip.set = omap_gpio_set;
1090 if (bank->is_mpuio) {
1091 bank->chip.label = "mpuio";
1092 if (bank->regs->wkup_en)
1093 bank->chip.dev = &omap_mpuio_device.dev;
1094 bank->chip.base = OMAP_MPUIO(0);
1095 } else {
1096 bank->chip.label = "gpio";
1097 bank->chip.base = gpio;
1098 }
1099 bank->chip.ngpio = bank->width;
1100
1101 ret = gpiochip_add(&bank->chip);
1102 if (ret) {
1103 dev_err(bank->dev, "Could not register gpio chip %d\n", ret);
1104 return ret;
1105 }
1106
1107 if (!bank->is_mpuio)
1108 gpio += bank->width;
1109
1110 #ifdef CONFIG_ARCH_OMAP1
1111 /*
1112 * REVISIT: Once we have OMAP1 supporting SPARSE_IRQ, we can drop
1113 * irq_alloc_descs() since a base IRQ offset will no longer be needed.
1114 */
1115 irq_base = irq_alloc_descs(-1, 0, bank->width, 0);
1116 if (irq_base < 0) {
1117 dev_err(bank->dev, "Couldn't allocate IRQ numbers\n");
1118 return -ENODEV;
1119 }
1120 #endif
1121
1122 /* MPUIO is a bit different, reading IRQ status clears it */
1123 if (bank->is_mpuio) {
1124 irqc->irq_ack = dummy_irq_chip.irq_ack;
1125 if (!bank->regs->wkup_en)
1126 irqc->irq_set_wake = NULL;
1127 }
1128
1129 ret = gpiochip_irqchip_add(&bank->chip, irqc,
1130 irq_base, handle_bad_irq,
1131 IRQ_TYPE_NONE);
1132
1133 if (ret) {
1134 dev_err(bank->dev, "Couldn't add irqchip to gpiochip %d\n", ret);
1135 gpiochip_remove(&bank->chip);
1136 return -ENODEV;
1137 }
1138
1139 gpiochip_set_chained_irqchip(&bank->chip, irqc, bank->irq, NULL);
1140
1141 ret = devm_request_irq(bank->dev, bank->irq, omap_gpio_irq_handler,
1142 0, dev_name(bank->dev), bank);
1143 if (ret)
1144 gpiochip_remove(&bank->chip);
1145
1146 return ret;
1147 }
1148
1149 static const struct of_device_id omap_gpio_match[];
1150
1151 static int omap_gpio_probe(struct platform_device *pdev)
1152 {
1153 struct device *dev = &pdev->dev;
1154 struct device_node *node = dev->of_node;
1155 const struct of_device_id *match;
1156 const struct omap_gpio_platform_data *pdata;
1157 struct resource *res;
1158 struct gpio_bank *bank;
1159 struct irq_chip *irqc;
1160 int ret;
1161
1162 match = of_match_device(of_match_ptr(omap_gpio_match), dev);
1163
1164 pdata = match ? match->data : dev_get_platdata(dev);
1165 if (!pdata)
1166 return -EINVAL;
1167
1168 bank = devm_kzalloc(dev, sizeof(struct gpio_bank), GFP_KERNEL);
1169 if (!bank) {
1170 dev_err(dev, "Memory alloc failed\n");
1171 return -ENOMEM;
1172 }
1173
1174 irqc = devm_kzalloc(dev, sizeof(*irqc), GFP_KERNEL);
1175 if (!irqc)
1176 return -ENOMEM;
1177
1178 irqc->irq_startup = omap_gpio_irq_startup,
1179 irqc->irq_shutdown = omap_gpio_irq_shutdown,
1180 irqc->irq_ack = omap_gpio_ack_irq,
1181 irqc->irq_mask = omap_gpio_mask_irq,
1182 irqc->irq_unmask = omap_gpio_unmask_irq,
1183 irqc->irq_set_type = omap_gpio_irq_type,
1184 irqc->irq_set_wake = omap_gpio_wake_enable,
1185 irqc->irq_bus_lock = omap_gpio_irq_bus_lock,
1186 irqc->irq_bus_sync_unlock = gpio_irq_bus_sync_unlock,
1187 irqc->name = dev_name(&pdev->dev);
1188
1189 bank->irq = platform_get_irq(pdev, 0);
1190 if (bank->irq <= 0) {
1191 if (!bank->irq)
1192 bank->irq = -ENXIO;
1193 if (bank->irq != -EPROBE_DEFER)
1194 dev_err(dev,
1195 "can't get irq resource ret=%d\n", bank->irq);
1196 return bank->irq;
1197 }
1198
1199 bank->dev = dev;
1200 bank->chip.dev = dev;
1201 bank->chip.owner = THIS_MODULE;
1202 bank->dbck_flag = pdata->dbck_flag;
1203 bank->stride = pdata->bank_stride;
1204 bank->width = pdata->bank_width;
1205 bank->is_mpuio = pdata->is_mpuio;
1206 bank->non_wakeup_gpios = pdata->non_wakeup_gpios;
1207 bank->regs = pdata->regs;
1208 #ifdef CONFIG_OF_GPIO
1209 bank->chip.of_node = of_node_get(node);
1210 #endif
1211 if (node) {
1212 if (!of_property_read_bool(node, "ti,gpio-always-on"))
1213 bank->loses_context = true;
1214 } else {
1215 bank->loses_context = pdata->loses_context;
1216
1217 if (bank->loses_context)
1218 bank->get_context_loss_count =
1219 pdata->get_context_loss_count;
1220 }
1221
1222 if (bank->regs->set_dataout && bank->regs->clr_dataout)
1223 bank->set_dataout = omap_set_gpio_dataout_reg;
1224 else
1225 bank->set_dataout = omap_set_gpio_dataout_mask;
1226
1227 raw_spin_lock_init(&bank->lock);
1228 raw_spin_lock_init(&bank->wa_lock);
1229
1230 /* Static mapping, never released */
1231 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1232 bank->base = devm_ioremap_resource(dev, res);
1233 if (IS_ERR(bank->base)) {
1234 return PTR_ERR(bank->base);
1235 }
1236
1237 if (bank->dbck_flag) {
1238 bank->dbck = devm_clk_get(bank->dev, "dbclk");
1239 if (IS_ERR(bank->dbck)) {
1240 dev_err(bank->dev,
1241 "Could not get gpio dbck. Disable debounce\n");
1242 bank->dbck_flag = false;
1243 } else {
1244 clk_prepare(bank->dbck);
1245 }
1246 }
1247
1248 platform_set_drvdata(pdev, bank);
1249
1250 pm_runtime_enable(bank->dev);
1251 pm_runtime_irq_safe(bank->dev);
1252 pm_runtime_get_sync(bank->dev);
1253
1254 if (bank->is_mpuio)
1255 omap_mpuio_init(bank);
1256
1257 omap_gpio_mod_init(bank);
1258
1259 ret = omap_gpio_chip_init(bank, irqc);
1260 if (ret) {
1261 pm_runtime_put_sync(bank->dev);
1262 pm_runtime_disable(bank->dev);
1263 return ret;
1264 }
1265
1266 omap_gpio_show_rev(bank);
1267
1268 pm_runtime_put(bank->dev);
1269
1270 list_add_tail(&bank->node, &omap_gpio_list);
1271
1272 return 0;
1273 }
1274
1275 static int omap_gpio_remove(struct platform_device *pdev)
1276 {
1277 struct gpio_bank *bank = platform_get_drvdata(pdev);
1278
1279 list_del(&bank->node);
1280 gpiochip_remove(&bank->chip);
1281 pm_runtime_disable(bank->dev);
1282 if (bank->dbck_flag)
1283 clk_unprepare(bank->dbck);
1284
1285 return 0;
1286 }
1287
1288 #ifdef CONFIG_ARCH_OMAP2PLUS
1289
1290 #if defined(CONFIG_PM)
1291 static void omap_gpio_restore_context(struct gpio_bank *bank);
1292
1293 static int omap_gpio_runtime_suspend(struct device *dev)
1294 {
1295 struct platform_device *pdev = to_platform_device(dev);
1296 struct gpio_bank *bank = platform_get_drvdata(pdev);
1297 u32 l1 = 0, l2 = 0;
1298 unsigned long flags;
1299 u32 wake_low, wake_hi;
1300
1301 raw_spin_lock_irqsave(&bank->lock, flags);
1302
1303 /*
1304 * Only edges can generate a wakeup event to the PRCM.
1305 *
1306 * Therefore, ensure any wake-up capable GPIOs have
1307 * edge-detection enabled before going idle to ensure a wakeup
1308 * to the PRCM is generated on a GPIO transition. (c.f. 34xx
1309 * NDA TRM 25.5.3.1)
1310 *
1311 * The normal values will be restored upon ->runtime_resume()
1312 * by writing back the values saved in bank->context.
1313 */
1314 wake_low = bank->context.leveldetect0 & bank->context.wake_en;
1315 if (wake_low)
1316 writel_relaxed(wake_low | bank->context.fallingdetect,
1317 bank->base + bank->regs->fallingdetect);
1318 wake_hi = bank->context.leveldetect1 & bank->context.wake_en;
1319 if (wake_hi)
1320 writel_relaxed(wake_hi | bank->context.risingdetect,
1321 bank->base + bank->regs->risingdetect);
1322
1323 if (!bank->enabled_non_wakeup_gpios)
1324 goto update_gpio_context_count;
1325
1326 if (bank->power_mode != OFF_MODE) {
1327 bank->power_mode = 0;
1328 goto update_gpio_context_count;
1329 }
1330 /*
1331 * If going to OFF, remove triggering for all
1332 * non-wakeup GPIOs. Otherwise spurious IRQs will be
1333 * generated. See OMAP2420 Errata item 1.101.
1334 */
1335 bank->saved_datain = readl_relaxed(bank->base +
1336 bank->regs->datain);
1337 l1 = bank->context.fallingdetect;
1338 l2 = bank->context.risingdetect;
1339
1340 l1 &= ~bank->enabled_non_wakeup_gpios;
1341 l2 &= ~bank->enabled_non_wakeup_gpios;
1342
1343 writel_relaxed(l1, bank->base + bank->regs->fallingdetect);
1344 writel_relaxed(l2, bank->base + bank->regs->risingdetect);
1345
1346 bank->workaround_enabled = true;
1347
1348 update_gpio_context_count:
1349 if (bank->get_context_loss_count)
1350 bank->context_loss_count =
1351 bank->get_context_loss_count(bank->dev);
1352
1353 omap_gpio_dbck_disable(bank);
1354 raw_spin_unlock_irqrestore(&bank->lock, flags);
1355
1356 return 0;
1357 }
1358
1359 static void omap_gpio_init_context(struct gpio_bank *p);
1360
1361 static int omap_gpio_runtime_resume(struct device *dev)
1362 {
1363 struct platform_device *pdev = to_platform_device(dev);
1364 struct gpio_bank *bank = platform_get_drvdata(pdev);
1365 u32 l = 0, gen, gen0, gen1;
1366 unsigned long flags;
1367 int c;
1368
1369 raw_spin_lock_irqsave(&bank->lock, flags);
1370
1371 /*
1372 * On the first resume during the probe, the context has not
1373 * been initialised and so initialise it now. Also initialise
1374 * the context loss count.
1375 */
1376 if (bank->loses_context && !bank->context_valid) {
1377 omap_gpio_init_context(bank);
1378
1379 if (bank->get_context_loss_count)
1380 bank->context_loss_count =
1381 bank->get_context_loss_count(bank->dev);
1382 }
1383
1384 omap_gpio_dbck_enable(bank);
1385
1386 /*
1387 * In ->runtime_suspend(), level-triggered, wakeup-enabled
1388 * GPIOs were set to edge trigger also in order to be able to
1389 * generate a PRCM wakeup. Here we restore the
1390 * pre-runtime_suspend() values for edge triggering.
1391 */
1392 writel_relaxed(bank->context.fallingdetect,
1393 bank->base + bank->regs->fallingdetect);
1394 writel_relaxed(bank->context.risingdetect,
1395 bank->base + bank->regs->risingdetect);
1396
1397 if (bank->loses_context) {
1398 if (!bank->get_context_loss_count) {
1399 omap_gpio_restore_context(bank);
1400 } else {
1401 c = bank->get_context_loss_count(bank->dev);
1402 if (c != bank->context_loss_count) {
1403 omap_gpio_restore_context(bank);
1404 } else {
1405 raw_spin_unlock_irqrestore(&bank->lock, flags);
1406 return 0;
1407 }
1408 }
1409 }
1410
1411 if (!bank->workaround_enabled) {
1412 raw_spin_unlock_irqrestore(&bank->lock, flags);
1413 return 0;
1414 }
1415
1416 l = readl_relaxed(bank->base + bank->regs->datain);
1417
1418 /*
1419 * Check if any of the non-wakeup interrupt GPIOs have changed
1420 * state. If so, generate an IRQ by software. This is
1421 * horribly racy, but it's the best we can do to work around
1422 * this silicon bug.
1423 */
1424 l ^= bank->saved_datain;
1425 l &= bank->enabled_non_wakeup_gpios;
1426
1427 /*
1428 * No need to generate IRQs for the rising edge for gpio IRQs
1429 * configured with falling edge only; and vice versa.
1430 */
1431 gen0 = l & bank->context.fallingdetect;
1432 gen0 &= bank->saved_datain;
1433
1434 gen1 = l & bank->context.risingdetect;
1435 gen1 &= ~(bank->saved_datain);
1436
1437 /* FIXME: Consider GPIO IRQs with level detections properly! */
1438 gen = l & (~(bank->context.fallingdetect) &
1439 ~(bank->context.risingdetect));
1440 /* Consider all GPIO IRQs needed to be updated */
1441 gen |= gen0 | gen1;
1442
1443 if (gen) {
1444 u32 old0, old1;
1445
1446 old0 = readl_relaxed(bank->base + bank->regs->leveldetect0);
1447 old1 = readl_relaxed(bank->base + bank->regs->leveldetect1);
1448
1449 if (!bank->regs->irqstatus_raw0) {
1450 writel_relaxed(old0 | gen, bank->base +
1451 bank->regs->leveldetect0);
1452 writel_relaxed(old1 | gen, bank->base +
1453 bank->regs->leveldetect1);
1454 }
1455
1456 if (bank->regs->irqstatus_raw0) {
1457 writel_relaxed(old0 | l, bank->base +
1458 bank->regs->leveldetect0);
1459 writel_relaxed(old1 | l, bank->base +
1460 bank->regs->leveldetect1);
1461 }
1462 writel_relaxed(old0, bank->base + bank->regs->leveldetect0);
1463 writel_relaxed(old1, bank->base + bank->regs->leveldetect1);
1464 }
1465
1466 bank->workaround_enabled = false;
1467 raw_spin_unlock_irqrestore(&bank->lock, flags);
1468
1469 return 0;
1470 }
1471 #endif /* CONFIG_PM */
1472
1473 #if IS_BUILTIN(CONFIG_GPIO_OMAP)
1474 void omap2_gpio_prepare_for_idle(int pwr_mode)
1475 {
1476 struct gpio_bank *bank;
1477
1478 list_for_each_entry(bank, &omap_gpio_list, node) {
1479 if (!BANK_USED(bank) || !bank->loses_context)
1480 continue;
1481
1482 bank->power_mode = pwr_mode;
1483
1484 pm_runtime_put_sync_suspend(bank->dev);
1485 }
1486 }
1487
1488 void omap2_gpio_resume_after_idle(void)
1489 {
1490 struct gpio_bank *bank;
1491
1492 list_for_each_entry(bank, &omap_gpio_list, node) {
1493 if (!BANK_USED(bank) || !bank->loses_context)
1494 continue;
1495
1496 pm_runtime_get_sync(bank->dev);
1497 }
1498 }
1499 #endif
1500
1501 #if defined(CONFIG_PM)
1502 static void omap_gpio_init_context(struct gpio_bank *p)
1503 {
1504 struct omap_gpio_reg_offs *regs = p->regs;
1505 void __iomem *base = p->base;
1506
1507 p->context.ctrl = readl_relaxed(base + regs->ctrl);
1508 p->context.oe = readl_relaxed(base + regs->direction);
1509 p->context.wake_en = readl_relaxed(base + regs->wkup_en);
1510 p->context.leveldetect0 = readl_relaxed(base + regs->leveldetect0);
1511 p->context.leveldetect1 = readl_relaxed(base + regs->leveldetect1);
1512 p->context.risingdetect = readl_relaxed(base + regs->risingdetect);
1513 p->context.fallingdetect = readl_relaxed(base + regs->fallingdetect);
1514 p->context.irqenable1 = readl_relaxed(base + regs->irqenable);
1515 p->context.irqenable2 = readl_relaxed(base + regs->irqenable2);
1516
1517 if (regs->set_dataout && p->regs->clr_dataout)
1518 p->context.dataout = readl_relaxed(base + regs->set_dataout);
1519 else
1520 p->context.dataout = readl_relaxed(base + regs->dataout);
1521
1522 p->context_valid = true;
1523 }
1524
1525 static void omap_gpio_restore_context(struct gpio_bank *bank)
1526 {
1527 writel_relaxed(bank->context.wake_en,
1528 bank->base + bank->regs->wkup_en);
1529 writel_relaxed(bank->context.ctrl, bank->base + bank->regs->ctrl);
1530 writel_relaxed(bank->context.leveldetect0,
1531 bank->base + bank->regs->leveldetect0);
1532 writel_relaxed(bank->context.leveldetect1,
1533 bank->base + bank->regs->leveldetect1);
1534 writel_relaxed(bank->context.risingdetect,
1535 bank->base + bank->regs->risingdetect);
1536 writel_relaxed(bank->context.fallingdetect,
1537 bank->base + bank->regs->fallingdetect);
1538 if (bank->regs->set_dataout && bank->regs->clr_dataout)
1539 writel_relaxed(bank->context.dataout,
1540 bank->base + bank->regs->set_dataout);
1541 else
1542 writel_relaxed(bank->context.dataout,
1543 bank->base + bank->regs->dataout);
1544 writel_relaxed(bank->context.oe, bank->base + bank->regs->direction);
1545
1546 if (bank->dbck_enable_mask) {
1547 writel_relaxed(bank->context.debounce, bank->base +
1548 bank->regs->debounce);
1549 writel_relaxed(bank->context.debounce_en,
1550 bank->base + bank->regs->debounce_en);
1551 }
1552
1553 writel_relaxed(bank->context.irqenable1,
1554 bank->base + bank->regs->irqenable);
1555 writel_relaxed(bank->context.irqenable2,
1556 bank->base + bank->regs->irqenable2);
1557 }
1558 #endif /* CONFIG_PM */
1559 #else
1560 #define omap_gpio_runtime_suspend NULL
1561 #define omap_gpio_runtime_resume NULL
1562 static inline void omap_gpio_init_context(struct gpio_bank *p) {}
1563 #endif
1564
1565 static const struct dev_pm_ops gpio_pm_ops = {
1566 SET_RUNTIME_PM_OPS(omap_gpio_runtime_suspend, omap_gpio_runtime_resume,
1567 NULL)
1568 };
1569
1570 #if defined(CONFIG_OF)
1571 static struct omap_gpio_reg_offs omap2_gpio_regs = {
1572 .revision = OMAP24XX_GPIO_REVISION,
1573 .direction = OMAP24XX_GPIO_OE,
1574 .datain = OMAP24XX_GPIO_DATAIN,
1575 .dataout = OMAP24XX_GPIO_DATAOUT,
1576 .set_dataout = OMAP24XX_GPIO_SETDATAOUT,
1577 .clr_dataout = OMAP24XX_GPIO_CLEARDATAOUT,
1578 .irqstatus = OMAP24XX_GPIO_IRQSTATUS1,
1579 .irqstatus2 = OMAP24XX_GPIO_IRQSTATUS2,
1580 .irqenable = OMAP24XX_GPIO_IRQENABLE1,
1581 .irqenable2 = OMAP24XX_GPIO_IRQENABLE2,
1582 .set_irqenable = OMAP24XX_GPIO_SETIRQENABLE1,
1583 .clr_irqenable = OMAP24XX_GPIO_CLEARIRQENABLE1,
1584 .debounce = OMAP24XX_GPIO_DEBOUNCE_VAL,
1585 .debounce_en = OMAP24XX_GPIO_DEBOUNCE_EN,
1586 .ctrl = OMAP24XX_GPIO_CTRL,
1587 .wkup_en = OMAP24XX_GPIO_WAKE_EN,
1588 .leveldetect0 = OMAP24XX_GPIO_LEVELDETECT0,
1589 .leveldetect1 = OMAP24XX_GPIO_LEVELDETECT1,
1590 .risingdetect = OMAP24XX_GPIO_RISINGDETECT,
1591 .fallingdetect = OMAP24XX_GPIO_FALLINGDETECT,
1592 };
1593
1594 static struct omap_gpio_reg_offs omap4_gpio_regs = {
1595 .revision = OMAP4_GPIO_REVISION,
1596 .direction = OMAP4_GPIO_OE,
1597 .datain = OMAP4_GPIO_DATAIN,
1598 .dataout = OMAP4_GPIO_DATAOUT,
1599 .set_dataout = OMAP4_GPIO_SETDATAOUT,
1600 .clr_dataout = OMAP4_GPIO_CLEARDATAOUT,
1601 .irqstatus = OMAP4_GPIO_IRQSTATUS0,
1602 .irqstatus2 = OMAP4_GPIO_IRQSTATUS1,
1603 .irqenable = OMAP4_GPIO_IRQSTATUSSET0,
1604 .irqenable2 = OMAP4_GPIO_IRQSTATUSSET1,
1605 .set_irqenable = OMAP4_GPIO_IRQSTATUSSET0,
1606 .clr_irqenable = OMAP4_GPIO_IRQSTATUSCLR0,
1607 .debounce = OMAP4_GPIO_DEBOUNCINGTIME,
1608 .debounce_en = OMAP4_GPIO_DEBOUNCENABLE,
1609 .ctrl = OMAP4_GPIO_CTRL,
1610 .wkup_en = OMAP4_GPIO_IRQWAKEN0,
1611 .leveldetect0 = OMAP4_GPIO_LEVELDETECT0,
1612 .leveldetect1 = OMAP4_GPIO_LEVELDETECT1,
1613 .risingdetect = OMAP4_GPIO_RISINGDETECT,
1614 .fallingdetect = OMAP4_GPIO_FALLINGDETECT,
1615 };
1616
1617 static const struct omap_gpio_platform_data omap2_pdata = {
1618 .regs = &omap2_gpio_regs,
1619 .bank_width = 32,
1620 .dbck_flag = false,
1621 };
1622
1623 static const struct omap_gpio_platform_data omap3_pdata = {
1624 .regs = &omap2_gpio_regs,
1625 .bank_width = 32,
1626 .dbck_flag = true,
1627 };
1628
1629 static const struct omap_gpio_platform_data omap4_pdata = {
1630 .regs = &omap4_gpio_regs,
1631 .bank_width = 32,
1632 .dbck_flag = true,
1633 };
1634
1635 static const struct of_device_id omap_gpio_match[] = {
1636 {
1637 .compatible = "ti,omap4-gpio",
1638 .data = &omap4_pdata,
1639 },
1640 {
1641 .compatible = "ti,omap3-gpio",
1642 .data = &omap3_pdata,
1643 },
1644 {
1645 .compatible = "ti,omap2-gpio",
1646 .data = &omap2_pdata,
1647 },
1648 { },
1649 };
1650 MODULE_DEVICE_TABLE(of, omap_gpio_match);
1651 #endif
1652
1653 static struct platform_driver omap_gpio_driver = {
1654 .probe = omap_gpio_probe,
1655 .remove = omap_gpio_remove,
1656 .driver = {
1657 .name = "omap_gpio",
1658 .pm = &gpio_pm_ops,
1659 .of_match_table = of_match_ptr(omap_gpio_match),
1660 },
1661 };
1662
1663 /*
1664 * gpio driver register needs to be done before
1665 * machine_init functions access gpio APIs.
1666 * Hence omap_gpio_drv_reg() is a postcore_initcall.
1667 */
1668 static int __init omap_gpio_drv_reg(void)
1669 {
1670 return platform_driver_register(&omap_gpio_driver);
1671 }
1672 postcore_initcall(omap_gpio_drv_reg);
1673
1674 static void __exit omap_gpio_exit(void)
1675 {
1676 platform_driver_unregister(&omap_gpio_driver);
1677 }
1678 module_exit(omap_gpio_exit);
1679
1680 MODULE_DESCRIPTION("omap gpio driver");
1681 MODULE_ALIAS("platform:gpio-omap");
1682 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support