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serial: xilinx_uartps: fix bad register write in console_write
[linux-2.6-xlnx.git] / drivers / gpio / gpio-omap.c
blob4fbc208c32cfa213812f6356323a36a51c37087c
1 /*
2 * Support functions for OMAP GPIO
3 *
4 * Copyright (C) 2003-2005 Nokia Corporation
5 * Written by Juha Yrjölä <juha.yrjola@nokia.com>
6 *
7 * Copyright (C) 2009 Texas Instruments
8 * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 */
14
15 #include <linux/init.h>
16 #include <linux/module.h>
17 #include <linux/interrupt.h>
18 #include <linux/syscore_ops.h>
19 #include <linux/err.h>
20 #include <linux/clk.h>
21 #include <linux/io.h>
22 #include <linux/device.h>
23 #include <linux/pm_runtime.h>
24 #include <linux/pm.h>
25 #include <linux/of.h>
26 #include <linux/of_device.h>
27 #include <linux/irqdomain.h>
28
29 #include <mach/hardware.h>
30 #include <asm/irq.h>
31 #include <mach/irqs.h>
32 #include <asm/gpio.h>
33 #include <asm/mach/irq.h>
34
35 #define OFF_MODE 1
36
37 static LIST_HEAD(omap_gpio_list);
38
39 struct gpio_regs {
40 u32 irqenable1;
41 u32 irqenable2;
42 u32 wake_en;
43 u32 ctrl;
44 u32 oe;
45 u32 leveldetect0;
46 u32 leveldetect1;
47 u32 risingdetect;
48 u32 fallingdetect;
49 u32 dataout;
50 u32 debounce;
51 u32 debounce_en;
52 };
53
54 struct gpio_bank {
55 struct list_head node;
56 void __iomem *base;
57 u16 irq;
58 int irq_base;
59 struct irq_domain *domain;
60 u32 non_wakeup_gpios;
61 u32 enabled_non_wakeup_gpios;
62 struct gpio_regs context;
63 u32 saved_datain;
64 u32 level_mask;
65 u32 toggle_mask;
66 spinlock_t lock;
67 struct gpio_chip chip;
68 struct clk *dbck;
69 u32 mod_usage;
70 u32 dbck_enable_mask;
71 bool dbck_enabled;
72 struct device *dev;
73 bool is_mpuio;
74 bool dbck_flag;
75 bool loses_context;
76 int stride;
77 u32 width;
78 int context_loss_count;
79 int power_mode;
80 bool workaround_enabled;
81
82 void (*set_dataout)(struct gpio_bank *bank, int gpio, int enable);
83 int (*get_context_loss_count)(struct device *dev);
84
85 struct omap_gpio_reg_offs *regs;
86 };
87
88 #define GPIO_INDEX(bank, gpio) (gpio % bank->width)
89 #define GPIO_BIT(bank, gpio) (1 << GPIO_INDEX(bank, gpio))
90 #define GPIO_MOD_CTRL_BIT BIT(0)
91
92 static int irq_to_gpio(struct gpio_bank *bank, unsigned int gpio_irq)
93 {
94 return gpio_irq - bank->irq_base + bank->chip.base;
95 }
96
97 static void _set_gpio_direction(struct gpio_bank *bank, int gpio, int is_input)
98 {
99 void __iomem *reg = bank->base;
100 u32 l;
101
102 reg += bank->regs->direction;
103 l = __raw_readl(reg);
104 if (is_input)
105 l |= 1 << gpio;
106 else
107 l &= ~(1 << gpio);
108 __raw_writel(l, reg);
109 bank->context.oe = l;
110 }
111
112
113 /* set data out value using dedicate set/clear register */
114 static void _set_gpio_dataout_reg(struct gpio_bank *bank, int gpio, int enable)
115 {
116 void __iomem *reg = bank->base;
117 u32 l = GPIO_BIT(bank, gpio);
118
119 if (enable) {
120 reg += bank->regs->set_dataout;
121 bank->context.dataout |= l;
122 } else {
123 reg += bank->regs->clr_dataout;
124 bank->context.dataout &= ~l;
125 }
126
127 __raw_writel(l, reg);
128 }
129
130 /* set data out value using mask register */
131 static void _set_gpio_dataout_mask(struct gpio_bank *bank, int gpio, int enable)
132 {
133 void __iomem *reg = bank->base + bank->regs->dataout;
134 u32 gpio_bit = GPIO_BIT(bank, gpio);
135 u32 l;
136
137 l = __raw_readl(reg);
138 if (enable)
139 l |= gpio_bit;
140 else
141 l &= ~gpio_bit;
142 __raw_writel(l, reg);
143 bank->context.dataout = l;
144 }
145
146 static int _get_gpio_datain(struct gpio_bank *bank, int offset)
147 {
148 void __iomem *reg = bank->base + bank->regs->datain;
149
150 return (__raw_readl(reg) & (1 << offset)) != 0;
151 }
152
153 static int _get_gpio_dataout(struct gpio_bank *bank, int offset)
154 {
155 void __iomem *reg = bank->base + bank->regs->dataout;
156
157 return (__raw_readl(reg) & (1 << offset)) != 0;
158 }
159
160 static inline void _gpio_rmw(void __iomem *base, u32 reg, u32 mask, bool set)
161 {
162 int l = __raw_readl(base + reg);
163
164 if (set)
165 l |= mask;
166 else
167 l &= ~mask;
168
169 __raw_writel(l, base + reg);
170 }
171
172 static inline void _gpio_dbck_enable(struct gpio_bank *bank)
173 {
174 if (bank->dbck_enable_mask && !bank->dbck_enabled) {
175 clk_enable(bank->dbck);
176 bank->dbck_enabled = true;
177
178 __raw_writel(bank->dbck_enable_mask,
179 bank->base + bank->regs->debounce_en);
180 }
181 }
182
183 static inline void _gpio_dbck_disable(struct gpio_bank *bank)
184 {
185 if (bank->dbck_enable_mask && bank->dbck_enabled) {
186 /*
187 * Disable debounce before cutting it's clock. If debounce is
188 * enabled but the clock is not, GPIO module seems to be unable
189 * to detect events and generate interrupts at least on OMAP3.
190 */
191 __raw_writel(0, bank->base + bank->regs->debounce_en);
192
193 clk_disable(bank->dbck);
194 bank->dbck_enabled = false;
195 }
196 }
197
198 /**
199 * _set_gpio_debounce - low level gpio debounce time
200 * @bank: the gpio bank we're acting upon
201 * @gpio: the gpio number on this @gpio
202 * @debounce: debounce time to use
203 *
204 * OMAP's debounce time is in 31us steps so we need
205 * to convert and round up to the closest unit.
206 */
207 static void _set_gpio_debounce(struct gpio_bank *bank, unsigned gpio,
208 unsigned debounce)
209 {
210 void __iomem *reg;
211 u32 val;
212 u32 l;
213
214 if (!bank->dbck_flag)
215 return;
216
217 if (debounce < 32)
218 debounce = 0x01;
219 else if (debounce > 7936)
220 debounce = 0xff;
221 else
222 debounce = (debounce / 0x1f) - 1;
223
224 l = GPIO_BIT(bank, gpio);
225
226 clk_enable(bank->dbck);
227 reg = bank->base + bank->regs->debounce;
228 __raw_writel(debounce, reg);
229
230 reg = bank->base + bank->regs->debounce_en;
231 val = __raw_readl(reg);
232
233 if (debounce)
234 val |= l;
235 else
236 val &= ~l;
237 bank->dbck_enable_mask = val;
238
239 __raw_writel(val, reg);
240 clk_disable(bank->dbck);
241 /*
242 * Enable debounce clock per module.
243 * This call is mandatory because in omap_gpio_request() when
244 * *_runtime_get_sync() is called, _gpio_dbck_enable() within
245 * runtime callbck fails to turn on dbck because dbck_enable_mask
246 * used within _gpio_dbck_enable() is still not initialized at
247 * that point. Therefore we have to enable dbck here.
248 */
249 _gpio_dbck_enable(bank);
250 if (bank->dbck_enable_mask) {
251 bank->context.debounce = debounce;
252 bank->context.debounce_en = val;
253 }
254 }
255
256 static inline void set_gpio_trigger(struct gpio_bank *bank, int gpio,
257 unsigned trigger)
258 {
259 void __iomem *base = bank->base;
260 u32 gpio_bit = 1 << gpio;
261
262 _gpio_rmw(base, bank->regs->leveldetect0, gpio_bit,
263 trigger & IRQ_TYPE_LEVEL_LOW);
264 _gpio_rmw(base, bank->regs->leveldetect1, gpio_bit,
265 trigger & IRQ_TYPE_LEVEL_HIGH);
266 _gpio_rmw(base, bank->regs->risingdetect, gpio_bit,
267 trigger & IRQ_TYPE_EDGE_RISING);
268 _gpio_rmw(base, bank->regs->fallingdetect, gpio_bit,
269 trigger & IRQ_TYPE_EDGE_FALLING);
270
271 bank->context.leveldetect0 =
272 __raw_readl(bank->base + bank->regs->leveldetect0);
273 bank->context.leveldetect1 =
274 __raw_readl(bank->base + bank->regs->leveldetect1);
275 bank->context.risingdetect =
276 __raw_readl(bank->base + bank->regs->risingdetect);
277 bank->context.fallingdetect =
278 __raw_readl(bank->base + bank->regs->fallingdetect);
279
280 if (likely(!(bank->non_wakeup_gpios & gpio_bit))) {
281 _gpio_rmw(base, bank->regs->wkup_en, gpio_bit, trigger != 0);
282 bank->context.wake_en =
283 __raw_readl(bank->base + bank->regs->wkup_en);
284 }
285
286 /* This part needs to be executed always for OMAP{34xx, 44xx} */
287 if (!bank->regs->irqctrl) {
288 /* On omap24xx proceed only when valid GPIO bit is set */
289 if (bank->non_wakeup_gpios) {
290 if (!(bank->non_wakeup_gpios & gpio_bit))
291 goto exit;
292 }
293
294 /*
295 * Log the edge gpio and manually trigger the IRQ
296 * after resume if the input level changes
297 * to avoid irq lost during PER RET/OFF mode
298 * Applies for omap2 non-wakeup gpio and all omap3 gpios
299 */
300 if (trigger & IRQ_TYPE_EDGE_BOTH)
301 bank->enabled_non_wakeup_gpios |= gpio_bit;
302 else
303 bank->enabled_non_wakeup_gpios &= ~gpio_bit;
304 }
305
306 exit:
307 bank->level_mask =
308 __raw_readl(bank->base + bank->regs->leveldetect0) |
309 __raw_readl(bank->base + bank->regs->leveldetect1);
310 }
311
312 #ifdef CONFIG_ARCH_OMAP1
313 /*
314 * This only applies to chips that can't do both rising and falling edge
315 * detection at once. For all other chips, this function is a noop.
316 */
317 static void _toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio)
318 {
319 void __iomem *reg = bank->base;
320 u32 l = 0;
321
322 if (!bank->regs->irqctrl)
323 return;
324
325 reg += bank->regs->irqctrl;
326
327 l = __raw_readl(reg);
328 if ((l >> gpio) & 1)
329 l &= ~(1 << gpio);
330 else
331 l |= 1 << gpio;
332
333 __raw_writel(l, reg);
334 }
335 #else
336 static void _toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio) {}
337 #endif
338
339 static int _set_gpio_triggering(struct gpio_bank *bank, int gpio,
340 unsigned trigger)
341 {
342 void __iomem *reg = bank->base;
343 void __iomem *base = bank->base;
344 u32 l = 0;
345
346 if (bank->regs->leveldetect0 && bank->regs->wkup_en) {
347 set_gpio_trigger(bank, gpio, trigger);
348 } else if (bank->regs->irqctrl) {
349 reg += bank->regs->irqctrl;
350
351 l = __raw_readl(reg);
352 if ((trigger & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH)
353 bank->toggle_mask |= 1 << gpio;
354 if (trigger & IRQ_TYPE_EDGE_RISING)
355 l |= 1 << gpio;
356 else if (trigger & IRQ_TYPE_EDGE_FALLING)
357 l &= ~(1 << gpio);
358 else
359 return -EINVAL;
360
361 __raw_writel(l, reg);
362 } else if (bank->regs->edgectrl1) {
363 if (gpio & 0x08)
364 reg += bank->regs->edgectrl2;
365 else
366 reg += bank->regs->edgectrl1;
367
368 gpio &= 0x07;
369 l = __raw_readl(reg);
370 l &= ~(3 << (gpio << 1));
371 if (trigger & IRQ_TYPE_EDGE_RISING)
372 l |= 2 << (gpio << 1);
373 if (trigger & IRQ_TYPE_EDGE_FALLING)
374 l |= 1 << (gpio << 1);
375
376 /* Enable wake-up during idle for dynamic tick */
377 _gpio_rmw(base, bank->regs->wkup_en, 1 << gpio, trigger);
378 bank->context.wake_en =
379 __raw_readl(bank->base + bank->regs->wkup_en);
380 __raw_writel(l, reg);
381 }
382 return 0;
383 }
384
385 static int gpio_irq_type(struct irq_data *d, unsigned type)
386 {
387 struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
388 unsigned gpio;
389 int retval;
390 unsigned long flags;
391
392 if (!cpu_class_is_omap2() && d->irq > IH_MPUIO_BASE)
393 gpio = OMAP_MPUIO(d->irq - IH_MPUIO_BASE);
394 else
395 gpio = irq_to_gpio(bank, d->irq);
396
397 if (type & ~IRQ_TYPE_SENSE_MASK)
398 return -EINVAL;
399
400 if (!bank->regs->leveldetect0 &&
401 (type & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH)))
402 return -EINVAL;
403
404 spin_lock_irqsave(&bank->lock, flags);
405 retval = _set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), type);
406 spin_unlock_irqrestore(&bank->lock, flags);
407
408 if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
409 __irq_set_handler_locked(d->irq, handle_level_irq);
410 else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
411 __irq_set_handler_locked(d->irq, handle_edge_irq);
412
413 return retval;
414 }
415
416 static void _clear_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
417 {
418 void __iomem *reg = bank->base;
419
420 reg += bank->regs->irqstatus;
421 __raw_writel(gpio_mask, reg);
422
423 /* Workaround for clearing DSP GPIO interrupts to allow retention */
424 if (bank->regs->irqstatus2) {
425 reg = bank->base + bank->regs->irqstatus2;
426 __raw_writel(gpio_mask, reg);
427 }
428
429 /* Flush posted write for the irq status to avoid spurious interrupts */
430 __raw_readl(reg);
431 }
432
433 static inline void _clear_gpio_irqstatus(struct gpio_bank *bank, int gpio)
434 {
435 _clear_gpio_irqbank(bank, GPIO_BIT(bank, gpio));
436 }
437
438 static u32 _get_gpio_irqbank_mask(struct gpio_bank *bank)
439 {
440 void __iomem *reg = bank->base;
441 u32 l;
442 u32 mask = (1 << bank->width) - 1;
443
444 reg += bank->regs->irqenable;
445 l = __raw_readl(reg);
446 if (bank->regs->irqenable_inv)
447 l = ~l;
448 l &= mask;
449 return l;
450 }
451
452 static void _enable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
453 {
454 void __iomem *reg = bank->base;
455 u32 l;
456
457 if (bank->regs->set_irqenable) {
458 reg += bank->regs->set_irqenable;
459 l = gpio_mask;
460 bank->context.irqenable1 |= gpio_mask;
461 } else {
462 reg += bank->regs->irqenable;
463 l = __raw_readl(reg);
464 if (bank->regs->irqenable_inv)
465 l &= ~gpio_mask;
466 else
467 l |= gpio_mask;
468 bank->context.irqenable1 = l;
469 }
470
471 __raw_writel(l, reg);
472 }
473
474 static void _disable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
475 {
476 void __iomem *reg = bank->base;
477 u32 l;
478
479 if (bank->regs->clr_irqenable) {
480 reg += bank->regs->clr_irqenable;
481 l = gpio_mask;
482 bank->context.irqenable1 &= ~gpio_mask;
483 } else {
484 reg += bank->regs->irqenable;
485 l = __raw_readl(reg);
486 if (bank->regs->irqenable_inv)
487 l |= gpio_mask;
488 else
489 l &= ~gpio_mask;
490 bank->context.irqenable1 = l;
491 }
492
493 __raw_writel(l, reg);
494 }
495
496 static inline void _set_gpio_irqenable(struct gpio_bank *bank, int gpio, int enable)
497 {
498 if (enable)
499 _enable_gpio_irqbank(bank, GPIO_BIT(bank, gpio));
500 else
501 _disable_gpio_irqbank(bank, GPIO_BIT(bank, gpio));
502 }
503
504 /*
505 * Note that ENAWAKEUP needs to be enabled in GPIO_SYSCONFIG register.
506 * 1510 does not seem to have a wake-up register. If JTAG is connected
507 * to the target, system will wake up always on GPIO events. While
508 * system is running all registered GPIO interrupts need to have wake-up
509 * enabled. When system is suspended, only selected GPIO interrupts need
510 * to have wake-up enabled.
511 */
512 static int _set_gpio_wakeup(struct gpio_bank *bank, int gpio, int enable)
513 {
514 u32 gpio_bit = GPIO_BIT(bank, gpio);
515 unsigned long flags;
516
517 if (bank->non_wakeup_gpios & gpio_bit) {
518 dev_err(bank->dev,
519 "Unable to modify wakeup on non-wakeup GPIO%d\n", gpio);
520 return -EINVAL;
521 }
522
523 spin_lock_irqsave(&bank->lock, flags);
524 if (enable)
525 bank->context.wake_en |= gpio_bit;
526 else
527 bank->context.wake_en &= ~gpio_bit;
528
529 __raw_writel(bank->context.wake_en, bank->base + bank->regs->wkup_en);
530 spin_unlock_irqrestore(&bank->lock, flags);
531
532 return 0;
533 }
534
535 static void _reset_gpio(struct gpio_bank *bank, int gpio)
536 {
537 _set_gpio_direction(bank, GPIO_INDEX(bank, gpio), 1);
538 _set_gpio_irqenable(bank, gpio, 0);
539 _clear_gpio_irqstatus(bank, gpio);
540 _set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), IRQ_TYPE_NONE);
541 }
542
543 /* Use disable_irq_wake() and enable_irq_wake() functions from drivers */
544 static int gpio_wake_enable(struct irq_data *d, unsigned int enable)
545 {
546 struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
547 unsigned int gpio = irq_to_gpio(bank, d->irq);
548
549 return _set_gpio_wakeup(bank, gpio, enable);
550 }
551
552 static int omap_gpio_request(struct gpio_chip *chip, unsigned offset)
553 {
554 struct gpio_bank *bank = container_of(chip, struct gpio_bank, chip);
555 unsigned long flags;
556
557 /*
558 * If this is the first gpio_request for the bank,
559 * enable the bank module.
560 */
561 if (!bank->mod_usage)
562 pm_runtime_get_sync(bank->dev);
563
564 spin_lock_irqsave(&bank->lock, flags);
565 /* Set trigger to none. You need to enable the desired trigger with
566 * request_irq() or set_irq_type().
567 */
568 _set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);
569
570 if (bank->regs->pinctrl) {
571 void __iomem *reg = bank->base + bank->regs->pinctrl;
572
573 /* Claim the pin for MPU */
574 __raw_writel(__raw_readl(reg) | (1 << offset), reg);
575 }
576
577 if (bank->regs->ctrl && !bank->mod_usage) {
578 void __iomem *reg = bank->base + bank->regs->ctrl;
579 u32 ctrl;
580
581 ctrl = __raw_readl(reg);
582 /* Module is enabled, clocks are not gated */
583 ctrl &= ~GPIO_MOD_CTRL_BIT;
584 __raw_writel(ctrl, reg);
585 bank->context.ctrl = ctrl;
586 }
587
588 bank->mod_usage |= 1 << offset;
589
590 spin_unlock_irqrestore(&bank->lock, flags);
591
592 return 0;
593 }
594
595 static void omap_gpio_free(struct gpio_chip *chip, unsigned offset)
596 {
597 struct gpio_bank *bank = container_of(chip, struct gpio_bank, chip);
598 void __iomem *base = bank->base;
599 unsigned long flags;
600
601 spin_lock_irqsave(&bank->lock, flags);
602
603 if (bank->regs->wkup_en) {
604 /* Disable wake-up during idle for dynamic tick */
605 _gpio_rmw(base, bank->regs->wkup_en, 1 << offset, 0);
606 bank->context.wake_en =
607 __raw_readl(bank->base + bank->regs->wkup_en);
608 }
609
610 bank->mod_usage &= ~(1 << offset);
611
612 if (bank->regs->ctrl && !bank->mod_usage) {
613 void __iomem *reg = bank->base + bank->regs->ctrl;
614 u32 ctrl;
615
616 ctrl = __raw_readl(reg);
617 /* Module is disabled, clocks are gated */
618 ctrl |= GPIO_MOD_CTRL_BIT;
619 __raw_writel(ctrl, reg);
620 bank->context.ctrl = ctrl;
621 }
622
623 _reset_gpio(bank, bank->chip.base + offset);
624 spin_unlock_irqrestore(&bank->lock, flags);
625
626 /*
627 * If this is the last gpio to be freed in the bank,
628 * disable the bank module.
629 */
630 if (!bank->mod_usage)
631 pm_runtime_put(bank->dev);
632 }
633
634 /*
635 * We need to unmask the GPIO bank interrupt as soon as possible to
636 * avoid missing GPIO interrupts for other lines in the bank.
637 * Then we need to mask-read-clear-unmask the triggered GPIO lines
638 * in the bank to avoid missing nested interrupts for a GPIO line.
639 * If we wait to unmask individual GPIO lines in the bank after the
640 * line's interrupt handler has been run, we may miss some nested
641 * interrupts.
642 */
643 static void gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
644 {
645 void __iomem *isr_reg = NULL;
646 u32 isr;
647 unsigned int gpio_irq, gpio_index;
648 struct gpio_bank *bank;
649 int unmasked = 0;
650 struct irq_chip *chip = irq_desc_get_chip(desc);
651
652 chained_irq_enter(chip, desc);
653
654 bank = irq_get_handler_data(irq);
655 isr_reg = bank->base + bank->regs->irqstatus;
656 pm_runtime_get_sync(bank->dev);
657
658 if (WARN_ON(!isr_reg))
659 goto exit;
660
661 while(1) {
662 u32 isr_saved, level_mask = 0;
663 u32 enabled;
664
665 enabled = _get_gpio_irqbank_mask(bank);
666 isr_saved = isr = __raw_readl(isr_reg) & enabled;
667
668 if (bank->level_mask)
669 level_mask = bank->level_mask & enabled;
670
671 /* clear edge sensitive interrupts before handler(s) are
672 called so that we don't miss any interrupt occurred while
673 executing them */
674 _disable_gpio_irqbank(bank, isr_saved & ~level_mask);
675 _clear_gpio_irqbank(bank, isr_saved & ~level_mask);
676 _enable_gpio_irqbank(bank, isr_saved & ~level_mask);
677
678 /* if there is only edge sensitive GPIO pin interrupts
679 configured, we could unmask GPIO bank interrupt immediately */
680 if (!level_mask && !unmasked) {
681 unmasked = 1;
682 chained_irq_exit(chip, desc);
683 }
684
685 if (!isr)
686 break;
687
688 gpio_irq = bank->irq_base;
689 for (; isr != 0; isr >>= 1, gpio_irq++) {
690 int gpio = irq_to_gpio(bank, gpio_irq);
691
692 if (!(isr & 1))
693 continue;
694
695 gpio_index = GPIO_INDEX(bank, gpio);
696
697 /*
698 * Some chips can't respond to both rising and falling
699 * at the same time. If this irq was requested with
700 * both flags, we need to flip the ICR data for the IRQ
701 * to respond to the IRQ for the opposite direction.
702 * This will be indicated in the bank toggle_mask.
703 */
704 if (bank->toggle_mask & (1 << gpio_index))
705 _toggle_gpio_edge_triggering(bank, gpio_index);
706
707 generic_handle_irq(gpio_irq);
708 }
709 }
710 /* if bank has any level sensitive GPIO pin interrupt
711 configured, we must unmask the bank interrupt only after
712 handler(s) are executed in order to avoid spurious bank
713 interrupt */
714 exit:
715 if (!unmasked)
716 chained_irq_exit(chip, desc);
717 pm_runtime_put(bank->dev);
718 }
719
720 static void gpio_irq_shutdown(struct irq_data *d)
721 {
722 struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
723 unsigned int gpio = irq_to_gpio(bank, d->irq);
724 unsigned long flags;
725
726 spin_lock_irqsave(&bank->lock, flags);
727 _reset_gpio(bank, gpio);
728 spin_unlock_irqrestore(&bank->lock, flags);
729 }
730
731 static void gpio_ack_irq(struct irq_data *d)
732 {
733 struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
734 unsigned int gpio = irq_to_gpio(bank, d->irq);
735
736 _clear_gpio_irqstatus(bank, gpio);
737 }
738
739 static void gpio_mask_irq(struct irq_data *d)
740 {
741 struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
742 unsigned int gpio = irq_to_gpio(bank, d->irq);
743 unsigned long flags;
744
745 spin_lock_irqsave(&bank->lock, flags);
746 _set_gpio_irqenable(bank, gpio, 0);
747 _set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), IRQ_TYPE_NONE);
748 spin_unlock_irqrestore(&bank->lock, flags);
749 }
750
751 static void gpio_unmask_irq(struct irq_data *d)
752 {
753 struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
754 unsigned int gpio = irq_to_gpio(bank, d->irq);
755 unsigned int irq_mask = GPIO_BIT(bank, gpio);
756 u32 trigger = irqd_get_trigger_type(d);
757 unsigned long flags;
758
759 spin_lock_irqsave(&bank->lock, flags);
760 if (trigger)
761 _set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), trigger);
762
763 /* For level-triggered GPIOs, the clearing must be done after
764 * the HW source is cleared, thus after the handler has run */
765 if (bank->level_mask & irq_mask) {
766 _set_gpio_irqenable(bank, gpio, 0);
767 _clear_gpio_irqstatus(bank, gpio);
768 }
769
770 _set_gpio_irqenable(bank, gpio, 1);
771 spin_unlock_irqrestore(&bank->lock, flags);
772 }
773
774 static struct irq_chip gpio_irq_chip = {
775 .name = "GPIO",
776 .irq_shutdown = gpio_irq_shutdown,
777 .irq_ack = gpio_ack_irq,
778 .irq_mask = gpio_mask_irq,
779 .irq_unmask = gpio_unmask_irq,
780 .irq_set_type = gpio_irq_type,
781 .irq_set_wake = gpio_wake_enable,
782 };
783
784 /*---------------------------------------------------------------------*/
785
786 static int omap_mpuio_suspend_noirq(struct device *dev)
787 {
788 struct platform_device *pdev = to_platform_device(dev);
789 struct gpio_bank *bank = platform_get_drvdata(pdev);
790 void __iomem *mask_reg = bank->base +
791 OMAP_MPUIO_GPIO_MASKIT / bank->stride;
792 unsigned long flags;
793
794 spin_lock_irqsave(&bank->lock, flags);
795 __raw_writel(0xffff & ~bank->context.wake_en, mask_reg);
796 spin_unlock_irqrestore(&bank->lock, flags);
797
798 return 0;
799 }
800
801 static int omap_mpuio_resume_noirq(struct device *dev)
802 {
803 struct platform_device *pdev = to_platform_device(dev);
804 struct gpio_bank *bank = platform_get_drvdata(pdev);
805 void __iomem *mask_reg = bank->base +
806 OMAP_MPUIO_GPIO_MASKIT / bank->stride;
807 unsigned long flags;
808
809 spin_lock_irqsave(&bank->lock, flags);
810 __raw_writel(bank->context.wake_en, mask_reg);
811 spin_unlock_irqrestore(&bank->lock, flags);
812
813 return 0;
814 }
815
816 static const struct dev_pm_ops omap_mpuio_dev_pm_ops = {
817 .suspend_noirq = omap_mpuio_suspend_noirq,
818 .resume_noirq = omap_mpuio_resume_noirq,
819 };
820
821 /* use platform_driver for this. */
822 static struct platform_driver omap_mpuio_driver = {
823 .driver = {
824 .name = "mpuio",
825 .pm = &omap_mpuio_dev_pm_ops,
826 },
827 };
828
829 static struct platform_device omap_mpuio_device = {
830 .name = "mpuio",
831 .id = -1,
832 .dev = {
833 .driver = &omap_mpuio_driver.driver,
834 }
835 /* could list the /proc/iomem resources */
836 };
837
838 static inline void mpuio_init(struct gpio_bank *bank)
839 {
840 platform_set_drvdata(&omap_mpuio_device, bank);
841
842 if (platform_driver_register(&omap_mpuio_driver) == 0)
843 (void) platform_device_register(&omap_mpuio_device);
844 }
845
846 /*---------------------------------------------------------------------*/
847
848 static int gpio_input(struct gpio_chip *chip, unsigned offset)
849 {
850 struct gpio_bank *bank;
851 unsigned long flags;
852
853 bank = container_of(chip, struct gpio_bank, chip);
854 spin_lock_irqsave(&bank->lock, flags);
855 _set_gpio_direction(bank, offset, 1);
856 spin_unlock_irqrestore(&bank->lock, flags);
857 return 0;
858 }
859
860 static int gpio_is_input(struct gpio_bank *bank, int mask)
861 {
862 void __iomem *reg = bank->base + bank->regs->direction;
863
864 return __raw_readl(reg) & mask;
865 }
866
867 static int gpio_get(struct gpio_chip *chip, unsigned offset)
868 {
869 struct gpio_bank *bank;
870 u32 mask;
871
872 bank = container_of(chip, struct gpio_bank, chip);
873 mask = (1 << offset);
874
875 if (gpio_is_input(bank, mask))
876 return _get_gpio_datain(bank, offset);
877 else
878 return _get_gpio_dataout(bank, offset);
879 }
880
881 static int gpio_output(struct gpio_chip *chip, unsigned offset, int value)
882 {
883 struct gpio_bank *bank;
884 unsigned long flags;
885
886 bank = container_of(chip, struct gpio_bank, chip);
887 spin_lock_irqsave(&bank->lock, flags);
888 bank->set_dataout(bank, offset, value);
889 _set_gpio_direction(bank, offset, 0);
890 spin_unlock_irqrestore(&bank->lock, flags);
891 return 0;
892 }
893
894 static int gpio_debounce(struct gpio_chip *chip, unsigned offset,
895 unsigned debounce)
896 {
897 struct gpio_bank *bank;
898 unsigned long flags;
899
900 bank = container_of(chip, struct gpio_bank, chip);
901
902 if (!bank->dbck) {
903 bank->dbck = clk_get(bank->dev, "dbclk");
904 if (IS_ERR(bank->dbck))
905 dev_err(bank->dev, "Could not get gpio dbck\n");
906 }
907
908 spin_lock_irqsave(&bank->lock, flags);
909 _set_gpio_debounce(bank, offset, debounce);
910 spin_unlock_irqrestore(&bank->lock, flags);
911
912 return 0;
913 }
914
915 static void gpio_set(struct gpio_chip *chip, unsigned offset, int value)
916 {
917 struct gpio_bank *bank;
918 unsigned long flags;
919
920 bank = container_of(chip, struct gpio_bank, chip);
921 spin_lock_irqsave(&bank->lock, flags);
922 bank->set_dataout(bank, offset, value);
923 spin_unlock_irqrestore(&bank->lock, flags);
924 }
925
926 static int gpio_2irq(struct gpio_chip *chip, unsigned offset)
927 {
928 struct gpio_bank *bank;
929
930 bank = container_of(chip, struct gpio_bank, chip);
931 return bank->irq_base + offset;
932 }
933
934 /*---------------------------------------------------------------------*/
935
936 static void __init omap_gpio_show_rev(struct gpio_bank *bank)
937 {
938 static bool called;
939 u32 rev;
940
941 if (called || bank->regs->revision == USHRT_MAX)
942 return;
943
944 rev = __raw_readw(bank->base + bank->regs->revision);
945 pr_info("OMAP GPIO hardware version %d.%d\n",
946 (rev >> 4) & 0x0f, rev & 0x0f);
947
948 called = true;
949 }
950
951 /* This lock class tells lockdep that GPIO irqs are in a different
952 * category than their parents, so it won't report false recursion.
953 */
954 static struct lock_class_key gpio_lock_class;
955
956 static void omap_gpio_mod_init(struct gpio_bank *bank)
957 {
958 void __iomem *base = bank->base;
959 u32 l = 0xffffffff;
960
961 if (bank->width == 16)
962 l = 0xffff;
963
964 if (bank->is_mpuio) {
965 __raw_writel(l, bank->base + bank->regs->irqenable);
966 return;
967 }
968
969 _gpio_rmw(base, bank->regs->irqenable, l, bank->regs->irqenable_inv);
970 _gpio_rmw(base, bank->regs->irqstatus, l, !bank->regs->irqenable_inv);
971 if (bank->regs->debounce_en)
972 __raw_writel(0, base + bank->regs->debounce_en);
973
974 /* Save OE default value (0xffffffff) in the context */
975 bank->context.oe = __raw_readl(bank->base + bank->regs->direction);
976 /* Initialize interface clk ungated, module enabled */
977 if (bank->regs->ctrl)
978 __raw_writel(0, base + bank->regs->ctrl);
979 }
980
981 static __devinit void
982 omap_mpuio_alloc_gc(struct gpio_bank *bank, unsigned int irq_start,
983 unsigned int num)
984 {
985 struct irq_chip_generic *gc;
986 struct irq_chip_type *ct;
987
988 gc = irq_alloc_generic_chip("MPUIO", 1, irq_start, bank->base,
989 handle_simple_irq);
990 if (!gc) {
991 dev_err(bank->dev, "Memory alloc failed for gc\n");
992 return;
993 }
994
995 ct = gc->chip_types;
996
997 /* NOTE: No ack required, reading IRQ status clears it. */
998 ct->chip.irq_mask = irq_gc_mask_set_bit;
999 ct->chip.irq_unmask = irq_gc_mask_clr_bit;
1000 ct->chip.irq_set_type = gpio_irq_type;
1001
1002 if (bank->regs->wkup_en)
1003 ct->chip.irq_set_wake = gpio_wake_enable,
1004
1005 ct->regs.mask = OMAP_MPUIO_GPIO_INT / bank->stride;
1006 irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE,
1007 IRQ_NOREQUEST | IRQ_NOPROBE, 0);
1008 }
1009
1010 static void __devinit omap_gpio_chip_init(struct gpio_bank *bank)
1011 {
1012 int j;
1013 static int gpio;
1014
1015 /*
1016 * REVISIT eventually switch from OMAP-specific gpio structs
1017 * over to the generic ones
1018 */
1019 bank->chip.request = omap_gpio_request;
1020 bank->chip.free = omap_gpio_free;
1021 bank->chip.direction_input = gpio_input;
1022 bank->chip.get = gpio_get;
1023 bank->chip.direction_output = gpio_output;
1024 bank->chip.set_debounce = gpio_debounce;
1025 bank->chip.set = gpio_set;
1026 bank->chip.to_irq = gpio_2irq;
1027 if (bank->is_mpuio) {
1028 bank->chip.label = "mpuio";
1029 if (bank->regs->wkup_en)
1030 bank->chip.dev = &omap_mpuio_device.dev;
1031 bank->chip.base = OMAP_MPUIO(0);
1032 } else {
1033 bank->chip.label = "gpio";
1034 bank->chip.base = gpio;
1035 gpio += bank->width;
1036 }
1037 bank->chip.ngpio = bank->width;
1038
1039 gpiochip_add(&bank->chip);
1040
1041 for (j = bank->irq_base; j < bank->irq_base + bank->width; j++) {
1042 irq_set_lockdep_class(j, &gpio_lock_class);
1043 irq_set_chip_data(j, bank);
1044 if (bank->is_mpuio) {
1045 omap_mpuio_alloc_gc(bank, j, bank->width);
1046 } else {
1047 irq_set_chip(j, &gpio_irq_chip);
1048 irq_set_handler(j, handle_simple_irq);
1049 set_irq_flags(j, IRQF_VALID);
1050 }
1051 }
1052 irq_set_chained_handler(bank->irq, gpio_irq_handler);
1053 irq_set_handler_data(bank->irq, bank);
1054 }
1055
1056 static const struct of_device_id omap_gpio_match[];
1057
1058 static int __devinit omap_gpio_probe(struct platform_device *pdev)
1059 {
1060 struct device *dev = &pdev->dev;
1061 struct device_node *node = dev->of_node;
1062 const struct of_device_id *match;
1063 struct omap_gpio_platform_data *pdata;
1064 struct resource *res;
1065 struct gpio_bank *bank;
1066 int ret = 0;
1067
1068 match = of_match_device(of_match_ptr(omap_gpio_match), dev);
1069
1070 pdata = match ? match->data : dev->platform_data;
1071 if (!pdata)
1072 return -EINVAL;
1073
1074 bank = devm_kzalloc(&pdev->dev, sizeof(struct gpio_bank), GFP_KERNEL);
1075 if (!bank) {
1076 dev_err(dev, "Memory alloc failed\n");
1077 return -ENOMEM;
1078 }
1079
1080 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1081 if (unlikely(!res)) {
1082 dev_err(dev, "Invalid IRQ resource\n");
1083 return -ENODEV;
1084 }
1085
1086 bank->irq = res->start;
1087 bank->dev = dev;
1088 bank->dbck_flag = pdata->dbck_flag;
1089 bank->stride = pdata->bank_stride;
1090 bank->width = pdata->bank_width;
1091 bank->is_mpuio = pdata->is_mpuio;
1092 bank->non_wakeup_gpios = pdata->non_wakeup_gpios;
1093 bank->loses_context = pdata->loses_context;
1094 bank->regs = pdata->regs;
1095 #ifdef CONFIG_OF_GPIO
1096 bank->chip.of_node = of_node_get(node);
1097 #endif
1098
1099 bank->irq_base = irq_alloc_descs(-1, 0, bank->width, 0);
1100 if (bank->irq_base < 0) {
1101 dev_err(dev, "Couldn't allocate IRQ numbers\n");
1102 return -ENODEV;
1103 }
1104
1105 bank->domain = irq_domain_add_legacy(node, bank->width, bank->irq_base,
1106 0, &irq_domain_simple_ops, NULL);
1107
1108 if (bank->regs->set_dataout && bank->regs->clr_dataout)
1109 bank->set_dataout = _set_gpio_dataout_reg;
1110 else
1111 bank->set_dataout = _set_gpio_dataout_mask;
1112
1113 spin_lock_init(&bank->lock);
1114
1115 /* Static mapping, never released */
1116 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1117 if (unlikely(!res)) {
1118 dev_err(dev, "Invalid mem resource\n");
1119 return -ENODEV;
1120 }
1121
1122 if (!devm_request_mem_region(dev, res->start, resource_size(res),
1123 pdev->name)) {
1124 dev_err(dev, "Region already claimed\n");
1125 return -EBUSY;
1126 }
1127
1128 bank->base = devm_ioremap(dev, res->start, resource_size(res));
1129 if (!bank->base) {
1130 dev_err(dev, "Could not ioremap\n");
1131 return -ENOMEM;
1132 }
1133
1134 platform_set_drvdata(pdev, bank);
1135
1136 pm_runtime_enable(bank->dev);
1137 pm_runtime_irq_safe(bank->dev);
1138 pm_runtime_get_sync(bank->dev);
1139
1140 if (bank->is_mpuio)
1141 mpuio_init(bank);
1142
1143 omap_gpio_mod_init(bank);
1144 omap_gpio_chip_init(bank);
1145 omap_gpio_show_rev(bank);
1146
1147 if (bank->loses_context)
1148 bank->get_context_loss_count = pdata->get_context_loss_count;
1149
1150 pm_runtime_put(bank->dev);
1151
1152 list_add_tail(&bank->node, &omap_gpio_list);
1153
1154 return ret;
1155 }
1156
1157 #ifdef CONFIG_ARCH_OMAP2PLUS
1158
1159 #if defined(CONFIG_PM_RUNTIME)
1160 static void omap_gpio_restore_context(struct gpio_bank *bank);
1161
1162 static int omap_gpio_runtime_suspend(struct device *dev)
1163 {
1164 struct platform_device *pdev = to_platform_device(dev);
1165 struct gpio_bank *bank = platform_get_drvdata(pdev);
1166 u32 l1 = 0, l2 = 0;
1167 unsigned long flags;
1168 u32 wake_low, wake_hi;
1169
1170 spin_lock_irqsave(&bank->lock, flags);
1171
1172 /*
1173 * Only edges can generate a wakeup event to the PRCM.
1174 *
1175 * Therefore, ensure any wake-up capable GPIOs have
1176 * edge-detection enabled before going idle to ensure a wakeup
1177 * to the PRCM is generated on a GPIO transition. (c.f. 34xx
1178 * NDA TRM 25.5.3.1)
1179 *
1180 * The normal values will be restored upon ->runtime_resume()
1181 * by writing back the values saved in bank->context.
1182 */
1183 wake_low = bank->context.leveldetect0 & bank->context.wake_en;
1184 if (wake_low)
1185 __raw_writel(wake_low | bank->context.fallingdetect,
1186 bank->base + bank->regs->fallingdetect);
1187 wake_hi = bank->context.leveldetect1 & bank->context.wake_en;
1188 if (wake_hi)
1189 __raw_writel(wake_hi | bank->context.risingdetect,
1190 bank->base + bank->regs->risingdetect);
1191
1192 if (!bank->enabled_non_wakeup_gpios)
1193 goto update_gpio_context_count;
1194
1195 if (bank->power_mode != OFF_MODE) {
1196 bank->power_mode = 0;
1197 goto update_gpio_context_count;
1198 }
1199 /*
1200 * If going to OFF, remove triggering for all
1201 * non-wakeup GPIOs. Otherwise spurious IRQs will be
1202 * generated. See OMAP2420 Errata item 1.101.
1203 */
1204 bank->saved_datain = __raw_readl(bank->base +
1205 bank->regs->datain);
1206 l1 = bank->context.fallingdetect;
1207 l2 = bank->context.risingdetect;
1208
1209 l1 &= ~bank->enabled_non_wakeup_gpios;
1210 l2 &= ~bank->enabled_non_wakeup_gpios;
1211
1212 __raw_writel(l1, bank->base + bank->regs->fallingdetect);
1213 __raw_writel(l2, bank->base + bank->regs->risingdetect);
1214
1215 bank->workaround_enabled = true;
1216
1217 update_gpio_context_count:
1218 if (bank->get_context_loss_count)
1219 bank->context_loss_count =
1220 bank->get_context_loss_count(bank->dev);
1221
1222 _gpio_dbck_disable(bank);
1223 spin_unlock_irqrestore(&bank->lock, flags);
1224
1225 return 0;
1226 }
1227
1228 static int omap_gpio_runtime_resume(struct device *dev)
1229 {
1230 struct platform_device *pdev = to_platform_device(dev);
1231 struct gpio_bank *bank = platform_get_drvdata(pdev);
1232 int context_lost_cnt_after;
1233 u32 l = 0, gen, gen0, gen1;
1234 unsigned long flags;
1235
1236 spin_lock_irqsave(&bank->lock, flags);
1237 _gpio_dbck_enable(bank);
1238
1239 /*
1240 * In ->runtime_suspend(), level-triggered, wakeup-enabled
1241 * GPIOs were set to edge trigger also in order to be able to
1242 * generate a PRCM wakeup. Here we restore the
1243 * pre-runtime_suspend() values for edge triggering.
1244 */
1245 __raw_writel(bank->context.fallingdetect,
1246 bank->base + bank->regs->fallingdetect);
1247 __raw_writel(bank->context.risingdetect,
1248 bank->base + bank->regs->risingdetect);
1249
1250 if (bank->get_context_loss_count) {
1251 context_lost_cnt_after =
1252 bank->get_context_loss_count(bank->dev);
1253 if (context_lost_cnt_after != bank->context_loss_count) {
1254 omap_gpio_restore_context(bank);
1255 } else {
1256 spin_unlock_irqrestore(&bank->lock, flags);
1257 return 0;
1258 }
1259 }
1260
1261 if (!bank->workaround_enabled) {
1262 spin_unlock_irqrestore(&bank->lock, flags);
1263 return 0;
1264 }
1265
1266 __raw_writel(bank->context.fallingdetect,
1267 bank->base + bank->regs->fallingdetect);
1268 __raw_writel(bank->context.risingdetect,
1269 bank->base + bank->regs->risingdetect);
1270 l = __raw_readl(bank->base + bank->regs->datain);
1271
1272 /*
1273 * Check if any of the non-wakeup interrupt GPIOs have changed
1274 * state. If so, generate an IRQ by software. This is
1275 * horribly racy, but it's the best we can do to work around
1276 * this silicon bug.
1277 */
1278 l ^= bank->saved_datain;
1279 l &= bank->enabled_non_wakeup_gpios;
1280
1281 /*
1282 * No need to generate IRQs for the rising edge for gpio IRQs
1283 * configured with falling edge only; and vice versa.
1284 */
1285 gen0 = l & bank->context.fallingdetect;
1286 gen0 &= bank->saved_datain;
1287
1288 gen1 = l & bank->context.risingdetect;
1289 gen1 &= ~(bank->saved_datain);
1290
1291 /* FIXME: Consider GPIO IRQs with level detections properly! */
1292 gen = l & (~(bank->context.fallingdetect) &
1293 ~(bank->context.risingdetect));
1294 /* Consider all GPIO IRQs needed to be updated */
1295 gen |= gen0 | gen1;
1296
1297 if (gen) {
1298 u32 old0, old1;
1299
1300 old0 = __raw_readl(bank->base + bank->regs->leveldetect0);
1301 old1 = __raw_readl(bank->base + bank->regs->leveldetect1);
1302
1303 if (!bank->regs->irqstatus_raw0) {
1304 __raw_writel(old0 | gen, bank->base +
1305 bank->regs->leveldetect0);
1306 __raw_writel(old1 | gen, bank->base +
1307 bank->regs->leveldetect1);
1308 }
1309
1310 if (bank->regs->irqstatus_raw0) {
1311 __raw_writel(old0 | l, bank->base +
1312 bank->regs->leveldetect0);
1313 __raw_writel(old1 | l, bank->base +
1314 bank->regs->leveldetect1);
1315 }
1316 __raw_writel(old0, bank->base + bank->regs->leveldetect0);
1317 __raw_writel(old1, bank->base + bank->regs->leveldetect1);
1318 }
1319
1320 bank->workaround_enabled = false;
1321 spin_unlock_irqrestore(&bank->lock, flags);
1322
1323 return 0;
1324 }
1325 #endif /* CONFIG_PM_RUNTIME */
1326
1327 void omap2_gpio_prepare_for_idle(int pwr_mode)
1328 {
1329 struct gpio_bank *bank;
1330
1331 list_for_each_entry(bank, &omap_gpio_list, node) {
1332 if (!bank->mod_usage || !bank->loses_context)
1333 continue;
1334
1335 bank->power_mode = pwr_mode;
1336
1337 pm_runtime_put_sync_suspend(bank->dev);
1338 }
1339 }
1340
1341 void omap2_gpio_resume_after_idle(void)
1342 {
1343 struct gpio_bank *bank;
1344
1345 list_for_each_entry(bank, &omap_gpio_list, node) {
1346 if (!bank->mod_usage || !bank->loses_context)
1347 continue;
1348
1349 pm_runtime_get_sync(bank->dev);
1350 }
1351 }
1352
1353 #if defined(CONFIG_PM_RUNTIME)
1354 static void omap_gpio_restore_context(struct gpio_bank *bank)
1355 {
1356 __raw_writel(bank->context.wake_en,
1357 bank->base + bank->regs->wkup_en);
1358 __raw_writel(bank->context.ctrl, bank->base + bank->regs->ctrl);
1359 __raw_writel(bank->context.leveldetect0,
1360 bank->base + bank->regs->leveldetect0);
1361 __raw_writel(bank->context.leveldetect1,
1362 bank->base + bank->regs->leveldetect1);
1363 __raw_writel(bank->context.risingdetect,
1364 bank->base + bank->regs->risingdetect);
1365 __raw_writel(bank->context.fallingdetect,
1366 bank->base + bank->regs->fallingdetect);
1367 if (bank->regs->set_dataout && bank->regs->clr_dataout)
1368 __raw_writel(bank->context.dataout,
1369 bank->base + bank->regs->set_dataout);
1370 else
1371 __raw_writel(bank->context.dataout,
1372 bank->base + bank->regs->dataout);
1373 __raw_writel(bank->context.oe, bank->base + bank->regs->direction);
1374
1375 if (bank->dbck_enable_mask) {
1376 __raw_writel(bank->context.debounce, bank->base +
1377 bank->regs->debounce);
1378 __raw_writel(bank->context.debounce_en,
1379 bank->base + bank->regs->debounce_en);
1380 }
1381
1382 __raw_writel(bank->context.irqenable1,
1383 bank->base + bank->regs->irqenable);
1384 __raw_writel(bank->context.irqenable2,
1385 bank->base + bank->regs->irqenable2);
1386 }
1387 #endif /* CONFIG_PM_RUNTIME */
1388 #else
1389 #define omap_gpio_runtime_suspend NULL
1390 #define omap_gpio_runtime_resume NULL
1391 #endif
1392
1393 static const struct dev_pm_ops gpio_pm_ops = {
1394 SET_RUNTIME_PM_OPS(omap_gpio_runtime_suspend, omap_gpio_runtime_resume,
1395 NULL)
1396 };
1397
1398 #if defined(CONFIG_OF)
1399 static struct omap_gpio_reg_offs omap2_gpio_regs = {
1400 .revision = OMAP24XX_GPIO_REVISION,
1401 .direction = OMAP24XX_GPIO_OE,
1402 .datain = OMAP24XX_GPIO_DATAIN,
1403 .dataout = OMAP24XX_GPIO_DATAOUT,
1404 .set_dataout = OMAP24XX_GPIO_SETDATAOUT,
1405 .clr_dataout = OMAP24XX_GPIO_CLEARDATAOUT,
1406 .irqstatus = OMAP24XX_GPIO_IRQSTATUS1,
1407 .irqstatus2 = OMAP24XX_GPIO_IRQSTATUS2,
1408 .irqenable = OMAP24XX_GPIO_IRQENABLE1,
1409 .irqenable2 = OMAP24XX_GPIO_IRQENABLE2,
1410 .set_irqenable = OMAP24XX_GPIO_SETIRQENABLE1,
1411 .clr_irqenable = OMAP24XX_GPIO_CLEARIRQENABLE1,
1412 .debounce = OMAP24XX_GPIO_DEBOUNCE_VAL,
1413 .debounce_en = OMAP24XX_GPIO_DEBOUNCE_EN,
1414 .ctrl = OMAP24XX_GPIO_CTRL,
1415 .wkup_en = OMAP24XX_GPIO_WAKE_EN,
1416 .leveldetect0 = OMAP24XX_GPIO_LEVELDETECT0,
1417 .leveldetect1 = OMAP24XX_GPIO_LEVELDETECT1,
1418 .risingdetect = OMAP24XX_GPIO_RISINGDETECT,
1419 .fallingdetect = OMAP24XX_GPIO_FALLINGDETECT,
1420 };
1421
1422 static struct omap_gpio_reg_offs omap4_gpio_regs = {
1423 .revision = OMAP4_GPIO_REVISION,
1424 .direction = OMAP4_GPIO_OE,
1425 .datain = OMAP4_GPIO_DATAIN,
1426 .dataout = OMAP4_GPIO_DATAOUT,
1427 .set_dataout = OMAP4_GPIO_SETDATAOUT,
1428 .clr_dataout = OMAP4_GPIO_CLEARDATAOUT,
1429 .irqstatus = OMAP4_GPIO_IRQSTATUS0,
1430 .irqstatus2 = OMAP4_GPIO_IRQSTATUS1,
1431 .irqenable = OMAP4_GPIO_IRQSTATUSSET0,
1432 .irqenable2 = OMAP4_GPIO_IRQSTATUSSET1,
1433 .set_irqenable = OMAP4_GPIO_IRQSTATUSSET0,
1434 .clr_irqenable = OMAP4_GPIO_IRQSTATUSCLR0,
1435 .debounce = OMAP4_GPIO_DEBOUNCINGTIME,
1436 .debounce_en = OMAP4_GPIO_DEBOUNCENABLE,
1437 .ctrl = OMAP4_GPIO_CTRL,
1438 .wkup_en = OMAP4_GPIO_IRQWAKEN0,
1439 .leveldetect0 = OMAP4_GPIO_LEVELDETECT0,
1440 .leveldetect1 = OMAP4_GPIO_LEVELDETECT1,
1441 .risingdetect = OMAP4_GPIO_RISINGDETECT,
1442 .fallingdetect = OMAP4_GPIO_FALLINGDETECT,
1443 };
1444
1445 static struct omap_gpio_platform_data omap2_pdata = {
1446 .regs = &omap2_gpio_regs,
1447 .bank_width = 32,
1448 .dbck_flag = false,
1449 };
1450
1451 static struct omap_gpio_platform_data omap3_pdata = {
1452 .regs = &omap2_gpio_regs,
1453 .bank_width = 32,
1454 .dbck_flag = true,
1455 };
1456
1457 static struct omap_gpio_platform_data omap4_pdata = {
1458 .regs = &omap4_gpio_regs,
1459 .bank_width = 32,
1460 .dbck_flag = true,
1461 };
1462
1463 static const struct of_device_id omap_gpio_match[] = {
1464 {
1465 .compatible = "ti,omap4-gpio",
1466 .data = &omap4_pdata,
1467 },
1468 {
1469 .compatible = "ti,omap3-gpio",
1470 .data = &omap3_pdata,
1471 },
1472 {
1473 .compatible = "ti,omap2-gpio",
1474 .data = &omap2_pdata,
1475 },
1476 { },
1477 };
1478 MODULE_DEVICE_TABLE(of, omap_gpio_match);
1479 #endif
1480
1481 static struct platform_driver omap_gpio_driver = {
1482 .probe = omap_gpio_probe,
1483 .driver = {
1484 .name = "omap_gpio",
1485 .pm = &gpio_pm_ops,
1486 .of_match_table = of_match_ptr(omap_gpio_match),
1487 },
1488 };
1489
1490 /*
1491 * gpio driver register needs to be done before
1492 * machine_init functions access gpio APIs.
1493 * Hence omap_gpio_drv_reg() is a postcore_initcall.
1494 */
1495 static int __init omap_gpio_drv_reg(void)
1496 {
1497 return platform_driver_register(&omap_gpio_driver);
1498 }
1499 postcore_initcall(omap_gpio_drv_reg);