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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/padovan/blueto...
[deliverable/linux.git] / drivers / gpio / gpio-omap.c
1 /*
2 * Support functions for OMAP GPIO
3 *
4 * Copyright (C) 2003-2005 Nokia Corporation
5 * Written by Juha Yrjölä <juha.yrjola@nokia.com>
6 *
7 * Copyright (C) 2009 Texas Instruments
8 * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 */
14
15 #include <linux/init.h>
16 #include <linux/module.h>
17 #include <linux/interrupt.h>
18 #include <linux/syscore_ops.h>
19 #include <linux/err.h>
20 #include <linux/clk.h>
21 #include <linux/io.h>
22 #include <linux/slab.h>
23 #include <linux/pm_runtime.h>
24
25 #include <mach/hardware.h>
26 #include <asm/irq.h>
27 #include <mach/irqs.h>
28 #include <asm/gpio.h>
29 #include <asm/mach/irq.h>
30
31 struct gpio_bank {
32 unsigned long pbase;
33 void __iomem *base;
34 u16 irq;
35 u16 virtual_irq_start;
36 int method;
37 u32 suspend_wakeup;
38 #if defined(CONFIG_ARCH_OMAP16XX) || defined(CONFIG_ARCH_OMAP2PLUS)
39 u32 saved_wakeup;
40 #endif
41 u32 non_wakeup_gpios;
42 u32 enabled_non_wakeup_gpios;
43
44 u32 saved_datain;
45 u32 saved_fallingdetect;
46 u32 saved_risingdetect;
47 u32 level_mask;
48 u32 toggle_mask;
49 spinlock_t lock;
50 struct gpio_chip chip;
51 struct clk *dbck;
52 u32 mod_usage;
53 u32 dbck_enable_mask;
54 struct device *dev;
55 bool dbck_flag;
56 int stride;
57 u32 width;
58
59 void (*set_dataout)(struct gpio_bank *bank, int gpio, int enable);
60
61 struct omap_gpio_reg_offs *regs;
62 };
63
64 #ifdef CONFIG_ARCH_OMAP3
65 struct omap3_gpio_regs {
66 u32 irqenable1;
67 u32 irqenable2;
68 u32 wake_en;
69 u32 ctrl;
70 u32 oe;
71 u32 leveldetect0;
72 u32 leveldetect1;
73 u32 risingdetect;
74 u32 fallingdetect;
75 u32 dataout;
76 };
77
78 static struct omap3_gpio_regs gpio_context[OMAP34XX_NR_GPIOS];
79 #endif
80
81 /*
82 * TODO: Cleanup gpio_bank usage as it is having information
83 * related to all instances of the device
84 */
85 static struct gpio_bank *gpio_bank;
86
87 /* TODO: Analyze removing gpio_bank_count usage from driver code */
88 int gpio_bank_count;
89
90 #define GPIO_INDEX(bank, gpio) (gpio % bank->width)
91 #define GPIO_BIT(bank, gpio) (1 << GPIO_INDEX(bank, gpio))
92
93 static void _set_gpio_direction(struct gpio_bank *bank, int gpio, int is_input)
94 {
95 void __iomem *reg = bank->base;
96 u32 l;
97
98 reg += bank->regs->direction;
99 l = __raw_readl(reg);
100 if (is_input)
101 l |= 1 << gpio;
102 else
103 l &= ~(1 << gpio);
104 __raw_writel(l, reg);
105 }
106
107
108 /* set data out value using dedicate set/clear register */
109 static void _set_gpio_dataout_reg(struct gpio_bank *bank, int gpio, int enable)
110 {
111 void __iomem *reg = bank->base;
112 u32 l = GPIO_BIT(bank, gpio);
113
114 if (enable)
115 reg += bank->regs->set_dataout;
116 else
117 reg += bank->regs->clr_dataout;
118
119 __raw_writel(l, reg);
120 }
121
122 /* set data out value using mask register */
123 static void _set_gpio_dataout_mask(struct gpio_bank *bank, int gpio, int enable)
124 {
125 void __iomem *reg = bank->base + bank->regs->dataout;
126 u32 gpio_bit = GPIO_BIT(bank, gpio);
127 u32 l;
128
129 l = __raw_readl(reg);
130 if (enable)
131 l |= gpio_bit;
132 else
133 l &= ~gpio_bit;
134 __raw_writel(l, reg);
135 }
136
137 static int _get_gpio_datain(struct gpio_bank *bank, int gpio)
138 {
139 void __iomem *reg = bank->base + bank->regs->datain;
140
141 return (__raw_readl(reg) & GPIO_BIT(bank, gpio)) != 0;
142 }
143
144 static int _get_gpio_dataout(struct gpio_bank *bank, int gpio)
145 {
146 void __iomem *reg = bank->base + bank->regs->dataout;
147
148 return (__raw_readl(reg) & GPIO_BIT(bank, gpio)) != 0;
149 }
150
151 static inline void _gpio_rmw(void __iomem *base, u32 reg, u32 mask, bool set)
152 {
153 int l = __raw_readl(base + reg);
154
155 if (set)
156 l |= mask;
157 else
158 l &= ~mask;
159
160 __raw_writel(l, base + reg);
161 }
162
163 /**
164 * _set_gpio_debounce - low level gpio debounce time
165 * @bank: the gpio bank we're acting upon
166 * @gpio: the gpio number on this @gpio
167 * @debounce: debounce time to use
168 *
169 * OMAP's debounce time is in 31us steps so we need
170 * to convert and round up to the closest unit.
171 */
172 static void _set_gpio_debounce(struct gpio_bank *bank, unsigned gpio,
173 unsigned debounce)
174 {
175 void __iomem *reg;
176 u32 val;
177 u32 l;
178
179 if (!bank->dbck_flag)
180 return;
181
182 if (debounce < 32)
183 debounce = 0x01;
184 else if (debounce > 7936)
185 debounce = 0xff;
186 else
187 debounce = (debounce / 0x1f) - 1;
188
189 l = GPIO_BIT(bank, gpio);
190
191 reg = bank->base + bank->regs->debounce;
192 __raw_writel(debounce, reg);
193
194 reg = bank->base + bank->regs->debounce_en;
195 val = __raw_readl(reg);
196
197 if (debounce) {
198 val |= l;
199 clk_enable(bank->dbck);
200 } else {
201 val &= ~l;
202 clk_disable(bank->dbck);
203 }
204 bank->dbck_enable_mask = val;
205
206 __raw_writel(val, reg);
207 }
208
209 #ifdef CONFIG_ARCH_OMAP2PLUS
210 static inline void set_24xx_gpio_triggering(struct gpio_bank *bank, int gpio,
211 int trigger)
212 {
213 void __iomem *base = bank->base;
214 u32 gpio_bit = 1 << gpio;
215
216 if (cpu_is_omap44xx()) {
217 _gpio_rmw(base, OMAP4_GPIO_LEVELDETECT0, gpio_bit,
218 trigger & IRQ_TYPE_LEVEL_LOW);
219 _gpio_rmw(base, OMAP4_GPIO_LEVELDETECT1, gpio_bit,
220 trigger & IRQ_TYPE_LEVEL_HIGH);
221 _gpio_rmw(base, OMAP4_GPIO_RISINGDETECT, gpio_bit,
222 trigger & IRQ_TYPE_EDGE_RISING);
223 _gpio_rmw(base, OMAP4_GPIO_FALLINGDETECT, gpio_bit,
224 trigger & IRQ_TYPE_EDGE_FALLING);
225 } else {
226 _gpio_rmw(base, OMAP24XX_GPIO_LEVELDETECT0, gpio_bit,
227 trigger & IRQ_TYPE_LEVEL_LOW);
228 _gpio_rmw(base, OMAP24XX_GPIO_LEVELDETECT1, gpio_bit,
229 trigger & IRQ_TYPE_LEVEL_HIGH);
230 _gpio_rmw(base, OMAP24XX_GPIO_RISINGDETECT, gpio_bit,
231 trigger & IRQ_TYPE_EDGE_RISING);
232 _gpio_rmw(base, OMAP24XX_GPIO_FALLINGDETECT, gpio_bit,
233 trigger & IRQ_TYPE_EDGE_FALLING);
234 }
235 if (likely(!(bank->non_wakeup_gpios & gpio_bit))) {
236 if (cpu_is_omap44xx()) {
237 _gpio_rmw(base, OMAP4_GPIO_IRQWAKEN0, gpio_bit,
238 trigger != 0);
239 } else {
240 /*
241 * GPIO wakeup request can only be generated on edge
242 * transitions
243 */
244 if (trigger & IRQ_TYPE_EDGE_BOTH)
245 __raw_writel(1 << gpio, bank->base
246 + OMAP24XX_GPIO_SETWKUENA);
247 else
248 __raw_writel(1 << gpio, bank->base
249 + OMAP24XX_GPIO_CLEARWKUENA);
250 }
251 }
252 /* This part needs to be executed always for OMAP{34xx, 44xx} */
253 if (cpu_is_omap34xx() || cpu_is_omap44xx() ||
254 (bank->non_wakeup_gpios & gpio_bit)) {
255 /*
256 * Log the edge gpio and manually trigger the IRQ
257 * after resume if the input level changes
258 * to avoid irq lost during PER RET/OFF mode
259 * Applies for omap2 non-wakeup gpio and all omap3 gpios
260 */
261 if (trigger & IRQ_TYPE_EDGE_BOTH)
262 bank->enabled_non_wakeup_gpios |= gpio_bit;
263 else
264 bank->enabled_non_wakeup_gpios &= ~gpio_bit;
265 }
266
267 if (cpu_is_omap44xx()) {
268 bank->level_mask =
269 __raw_readl(bank->base + OMAP4_GPIO_LEVELDETECT0) |
270 __raw_readl(bank->base + OMAP4_GPIO_LEVELDETECT1);
271 } else {
272 bank->level_mask =
273 __raw_readl(bank->base + OMAP24XX_GPIO_LEVELDETECT0) |
274 __raw_readl(bank->base + OMAP24XX_GPIO_LEVELDETECT1);
275 }
276 }
277 #endif
278
279 #ifdef CONFIG_ARCH_OMAP1
280 /*
281 * This only applies to chips that can't do both rising and falling edge
282 * detection at once. For all other chips, this function is a noop.
283 */
284 static void _toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio)
285 {
286 void __iomem *reg = bank->base;
287 u32 l = 0;
288
289 switch (bank->method) {
290 case METHOD_MPUIO:
291 reg += OMAP_MPUIO_GPIO_INT_EDGE / bank->stride;
292 break;
293 #ifdef CONFIG_ARCH_OMAP15XX
294 case METHOD_GPIO_1510:
295 reg += OMAP1510_GPIO_INT_CONTROL;
296 break;
297 #endif
298 #if defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP850)
299 case METHOD_GPIO_7XX:
300 reg += OMAP7XX_GPIO_INT_CONTROL;
301 break;
302 #endif
303 default:
304 return;
305 }
306
307 l = __raw_readl(reg);
308 if ((l >> gpio) & 1)
309 l &= ~(1 << gpio);
310 else
311 l |= 1 << gpio;
312
313 __raw_writel(l, reg);
314 }
315 #endif
316
317 static int _set_gpio_triggering(struct gpio_bank *bank, int gpio, int trigger)
318 {
319 void __iomem *reg = bank->base;
320 u32 l = 0;
321
322 switch (bank->method) {
323 #ifdef CONFIG_ARCH_OMAP1
324 case METHOD_MPUIO:
325 reg += OMAP_MPUIO_GPIO_INT_EDGE / bank->stride;
326 l = __raw_readl(reg);
327 if ((trigger & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH)
328 bank->toggle_mask |= 1 << gpio;
329 if (trigger & IRQ_TYPE_EDGE_RISING)
330 l |= 1 << gpio;
331 else if (trigger & IRQ_TYPE_EDGE_FALLING)
332 l &= ~(1 << gpio);
333 else
334 goto bad;
335 break;
336 #endif
337 #ifdef CONFIG_ARCH_OMAP15XX
338 case METHOD_GPIO_1510:
339 reg += OMAP1510_GPIO_INT_CONTROL;
340 l = __raw_readl(reg);
341 if ((trigger & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH)
342 bank->toggle_mask |= 1 << gpio;
343 if (trigger & IRQ_TYPE_EDGE_RISING)
344 l |= 1 << gpio;
345 else if (trigger & IRQ_TYPE_EDGE_FALLING)
346 l &= ~(1 << gpio);
347 else
348 goto bad;
349 break;
350 #endif
351 #ifdef CONFIG_ARCH_OMAP16XX
352 case METHOD_GPIO_1610:
353 if (gpio & 0x08)
354 reg += OMAP1610_GPIO_EDGE_CTRL2;
355 else
356 reg += OMAP1610_GPIO_EDGE_CTRL1;
357 gpio &= 0x07;
358 l = __raw_readl(reg);
359 l &= ~(3 << (gpio << 1));
360 if (trigger & IRQ_TYPE_EDGE_RISING)
361 l |= 2 << (gpio << 1);
362 if (trigger & IRQ_TYPE_EDGE_FALLING)
363 l |= 1 << (gpio << 1);
364 if (trigger)
365 /* Enable wake-up during idle for dynamic tick */
366 __raw_writel(1 << gpio, bank->base + OMAP1610_GPIO_SET_WAKEUPENA);
367 else
368 __raw_writel(1 << gpio, bank->base + OMAP1610_GPIO_CLEAR_WAKEUPENA);
369 break;
370 #endif
371 #if defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP850)
372 case METHOD_GPIO_7XX:
373 reg += OMAP7XX_GPIO_INT_CONTROL;
374 l = __raw_readl(reg);
375 if ((trigger & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH)
376 bank->toggle_mask |= 1 << gpio;
377 if (trigger & IRQ_TYPE_EDGE_RISING)
378 l |= 1 << gpio;
379 else if (trigger & IRQ_TYPE_EDGE_FALLING)
380 l &= ~(1 << gpio);
381 else
382 goto bad;
383 break;
384 #endif
385 #ifdef CONFIG_ARCH_OMAP2PLUS
386 case METHOD_GPIO_24XX:
387 case METHOD_GPIO_44XX:
388 set_24xx_gpio_triggering(bank, gpio, trigger);
389 return 0;
390 #endif
391 default:
392 goto bad;
393 }
394 __raw_writel(l, reg);
395 return 0;
396 bad:
397 return -EINVAL;
398 }
399
400 static int gpio_irq_type(struct irq_data *d, unsigned type)
401 {
402 struct gpio_bank *bank;
403 unsigned gpio;
404 int retval;
405 unsigned long flags;
406
407 if (!cpu_class_is_omap2() && d->irq > IH_MPUIO_BASE)
408 gpio = OMAP_MPUIO(d->irq - IH_MPUIO_BASE);
409 else
410 gpio = d->irq - IH_GPIO_BASE;
411
412 if (type & ~IRQ_TYPE_SENSE_MASK)
413 return -EINVAL;
414
415 /* OMAP1 allows only only edge triggering */
416 if (!cpu_class_is_omap2()
417 && (type & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH)))
418 return -EINVAL;
419
420 bank = irq_data_get_irq_chip_data(d);
421 spin_lock_irqsave(&bank->lock, flags);
422 retval = _set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), type);
423 spin_unlock_irqrestore(&bank->lock, flags);
424
425 if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
426 __irq_set_handler_locked(d->irq, handle_level_irq);
427 else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
428 __irq_set_handler_locked(d->irq, handle_edge_irq);
429
430 return retval;
431 }
432
433 static void _clear_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
434 {
435 void __iomem *reg = bank->base;
436
437 reg += bank->regs->irqstatus;
438 __raw_writel(gpio_mask, reg);
439
440 /* Workaround for clearing DSP GPIO interrupts to allow retention */
441 if (bank->regs->irqstatus2) {
442 reg = bank->base + bank->regs->irqstatus2;
443 __raw_writel(gpio_mask, reg);
444 }
445
446 /* Flush posted write for the irq status to avoid spurious interrupts */
447 __raw_readl(reg);
448 }
449
450 static inline void _clear_gpio_irqstatus(struct gpio_bank *bank, int gpio)
451 {
452 _clear_gpio_irqbank(bank, GPIO_BIT(bank, gpio));
453 }
454
455 static u32 _get_gpio_irqbank_mask(struct gpio_bank *bank)
456 {
457 void __iomem *reg = bank->base;
458 u32 l;
459 u32 mask = (1 << bank->width) - 1;
460
461 reg += bank->regs->irqenable;
462 l = __raw_readl(reg);
463 if (bank->regs->irqenable_inv)
464 l = ~l;
465 l &= mask;
466 return l;
467 }
468
469 static void _enable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
470 {
471 void __iomem *reg = bank->base;
472 u32 l;
473
474 if (bank->regs->set_irqenable) {
475 reg += bank->regs->set_irqenable;
476 l = gpio_mask;
477 } else {
478 reg += bank->regs->irqenable;
479 l = __raw_readl(reg);
480 if (bank->regs->irqenable_inv)
481 l &= ~gpio_mask;
482 else
483 l |= gpio_mask;
484 }
485
486 __raw_writel(l, reg);
487 }
488
489 static void _disable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
490 {
491 void __iomem *reg = bank->base;
492 u32 l;
493
494 if (bank->regs->clr_irqenable) {
495 reg += bank->regs->clr_irqenable;
496 l = gpio_mask;
497 } else {
498 reg += bank->regs->irqenable;
499 l = __raw_readl(reg);
500 if (bank->regs->irqenable_inv)
501 l |= gpio_mask;
502 else
503 l &= ~gpio_mask;
504 }
505
506 __raw_writel(l, reg);
507 }
508
509 static inline void _set_gpio_irqenable(struct gpio_bank *bank, int gpio, int enable)
510 {
511 _enable_gpio_irqbank(bank, GPIO_BIT(bank, gpio));
512 }
513
514 /*
515 * Note that ENAWAKEUP needs to be enabled in GPIO_SYSCONFIG register.
516 * 1510 does not seem to have a wake-up register. If JTAG is connected
517 * to the target, system will wake up always on GPIO events. While
518 * system is running all registered GPIO interrupts need to have wake-up
519 * enabled. When system is suspended, only selected GPIO interrupts need
520 * to have wake-up enabled.
521 */
522 static int _set_gpio_wakeup(struct gpio_bank *bank, int gpio, int enable)
523 {
524 u32 gpio_bit = GPIO_BIT(bank, gpio);
525 unsigned long flags;
526
527 if (bank->non_wakeup_gpios & gpio_bit) {
528 dev_err(bank->dev,
529 "Unable to modify wakeup on non-wakeup GPIO%d\n", gpio);
530 return -EINVAL;
531 }
532
533 spin_lock_irqsave(&bank->lock, flags);
534 if (enable)
535 bank->suspend_wakeup |= gpio_bit;
536 else
537 bank->suspend_wakeup &= ~gpio_bit;
538
539 spin_unlock_irqrestore(&bank->lock, flags);
540
541 return 0;
542 }
543
544 static void _reset_gpio(struct gpio_bank *bank, int gpio)
545 {
546 _set_gpio_direction(bank, GPIO_INDEX(bank, gpio), 1);
547 _set_gpio_irqenable(bank, gpio, 0);
548 _clear_gpio_irqstatus(bank, gpio);
549 _set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), IRQ_TYPE_NONE);
550 }
551
552 /* Use disable_irq_wake() and enable_irq_wake() functions from drivers */
553 static int gpio_wake_enable(struct irq_data *d, unsigned int enable)
554 {
555 unsigned int gpio = d->irq - IH_GPIO_BASE;
556 struct gpio_bank *bank;
557 int retval;
558
559 bank = irq_data_get_irq_chip_data(d);
560 retval = _set_gpio_wakeup(bank, gpio, enable);
561
562 return retval;
563 }
564
565 static int omap_gpio_request(struct gpio_chip *chip, unsigned offset)
566 {
567 struct gpio_bank *bank = container_of(chip, struct gpio_bank, chip);
568 unsigned long flags;
569
570 spin_lock_irqsave(&bank->lock, flags);
571
572 /* Set trigger to none. You need to enable the desired trigger with
573 * request_irq() or set_irq_type().
574 */
575 _set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);
576
577 #ifdef CONFIG_ARCH_OMAP15XX
578 if (bank->method == METHOD_GPIO_1510) {
579 void __iomem *reg;
580
581 /* Claim the pin for MPU */
582 reg = bank->base + OMAP1510_GPIO_PIN_CONTROL;
583 __raw_writel(__raw_readl(reg) | (1 << offset), reg);
584 }
585 #endif
586 if (!cpu_class_is_omap1()) {
587 if (!bank->mod_usage) {
588 void __iomem *reg = bank->base;
589 u32 ctrl;
590
591 if (cpu_is_omap24xx() || cpu_is_omap34xx())
592 reg += OMAP24XX_GPIO_CTRL;
593 else if (cpu_is_omap44xx())
594 reg += OMAP4_GPIO_CTRL;
595 ctrl = __raw_readl(reg);
596 /* Module is enabled, clocks are not gated */
597 ctrl &= 0xFFFFFFFE;
598 __raw_writel(ctrl, reg);
599 }
600 bank->mod_usage |= 1 << offset;
601 }
602 spin_unlock_irqrestore(&bank->lock, flags);
603
604 return 0;
605 }
606
607 static void omap_gpio_free(struct gpio_chip *chip, unsigned offset)
608 {
609 struct gpio_bank *bank = container_of(chip, struct gpio_bank, chip);
610 unsigned long flags;
611
612 spin_lock_irqsave(&bank->lock, flags);
613 #ifdef CONFIG_ARCH_OMAP16XX
614 if (bank->method == METHOD_GPIO_1610) {
615 /* Disable wake-up during idle for dynamic tick */
616 void __iomem *reg = bank->base + OMAP1610_GPIO_CLEAR_WAKEUPENA;
617 __raw_writel(1 << offset, reg);
618 }
619 #endif
620 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
621 if (bank->method == METHOD_GPIO_24XX) {
622 /* Disable wake-up during idle for dynamic tick */
623 void __iomem *reg = bank->base + OMAP24XX_GPIO_CLEARWKUENA;
624 __raw_writel(1 << offset, reg);
625 }
626 #endif
627 #ifdef CONFIG_ARCH_OMAP4
628 if (bank->method == METHOD_GPIO_44XX) {
629 /* Disable wake-up during idle for dynamic tick */
630 void __iomem *reg = bank->base + OMAP4_GPIO_IRQWAKEN0;
631 __raw_writel(1 << offset, reg);
632 }
633 #endif
634 if (!cpu_class_is_omap1()) {
635 bank->mod_usage &= ~(1 << offset);
636 if (!bank->mod_usage) {
637 void __iomem *reg = bank->base;
638 u32 ctrl;
639
640 if (cpu_is_omap24xx() || cpu_is_omap34xx())
641 reg += OMAP24XX_GPIO_CTRL;
642 else if (cpu_is_omap44xx())
643 reg += OMAP4_GPIO_CTRL;
644 ctrl = __raw_readl(reg);
645 /* Module is disabled, clocks are gated */
646 ctrl |= 1;
647 __raw_writel(ctrl, reg);
648 }
649 }
650 _reset_gpio(bank, bank->chip.base + offset);
651 spin_unlock_irqrestore(&bank->lock, flags);
652 }
653
654 /*
655 * We need to unmask the GPIO bank interrupt as soon as possible to
656 * avoid missing GPIO interrupts for other lines in the bank.
657 * Then we need to mask-read-clear-unmask the triggered GPIO lines
658 * in the bank to avoid missing nested interrupts for a GPIO line.
659 * If we wait to unmask individual GPIO lines in the bank after the
660 * line's interrupt handler has been run, we may miss some nested
661 * interrupts.
662 */
663 static void gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
664 {
665 void __iomem *isr_reg = NULL;
666 u32 isr;
667 unsigned int gpio_irq, gpio_index;
668 struct gpio_bank *bank;
669 u32 retrigger = 0;
670 int unmasked = 0;
671 struct irq_chip *chip = irq_desc_get_chip(desc);
672
673 chained_irq_enter(chip, desc);
674
675 bank = irq_get_handler_data(irq);
676 isr_reg = bank->base + bank->regs->irqstatus;
677
678 if (WARN_ON(!isr_reg))
679 goto exit;
680
681 while(1) {
682 u32 isr_saved, level_mask = 0;
683 u32 enabled;
684
685 enabled = _get_gpio_irqbank_mask(bank);
686 isr_saved = isr = __raw_readl(isr_reg) & enabled;
687
688 if (cpu_is_omap15xx() && (bank->method == METHOD_MPUIO))
689 isr &= 0x0000ffff;
690
691 if (cpu_class_is_omap2()) {
692 level_mask = bank->level_mask & enabled;
693 }
694
695 /* clear edge sensitive interrupts before handler(s) are
696 called so that we don't miss any interrupt occurred while
697 executing them */
698 _disable_gpio_irqbank(bank, isr_saved & ~level_mask);
699 _clear_gpio_irqbank(bank, isr_saved & ~level_mask);
700 _enable_gpio_irqbank(bank, isr_saved & ~level_mask);
701
702 /* if there is only edge sensitive GPIO pin interrupts
703 configured, we could unmask GPIO bank interrupt immediately */
704 if (!level_mask && !unmasked) {
705 unmasked = 1;
706 chained_irq_exit(chip, desc);
707 }
708
709 isr |= retrigger;
710 retrigger = 0;
711 if (!isr)
712 break;
713
714 gpio_irq = bank->virtual_irq_start;
715 for (; isr != 0; isr >>= 1, gpio_irq++) {
716 gpio_index = GPIO_INDEX(bank, irq_to_gpio(gpio_irq));
717
718 if (!(isr & 1))
719 continue;
720
721 #ifdef CONFIG_ARCH_OMAP1
722 /*
723 * Some chips can't respond to both rising and falling
724 * at the same time. If this irq was requested with
725 * both flags, we need to flip the ICR data for the IRQ
726 * to respond to the IRQ for the opposite direction.
727 * This will be indicated in the bank toggle_mask.
728 */
729 if (bank->toggle_mask & (1 << gpio_index))
730 _toggle_gpio_edge_triggering(bank, gpio_index);
731 #endif
732
733 generic_handle_irq(gpio_irq);
734 }
735 }
736 /* if bank has any level sensitive GPIO pin interrupt
737 configured, we must unmask the bank interrupt only after
738 handler(s) are executed in order to avoid spurious bank
739 interrupt */
740 exit:
741 if (!unmasked)
742 chained_irq_exit(chip, desc);
743 }
744
745 static void gpio_irq_shutdown(struct irq_data *d)
746 {
747 unsigned int gpio = d->irq - IH_GPIO_BASE;
748 struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
749 unsigned long flags;
750
751 spin_lock_irqsave(&bank->lock, flags);
752 _reset_gpio(bank, gpio);
753 spin_unlock_irqrestore(&bank->lock, flags);
754 }
755
756 static void gpio_ack_irq(struct irq_data *d)
757 {
758 unsigned int gpio = d->irq - IH_GPIO_BASE;
759 struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
760
761 _clear_gpio_irqstatus(bank, gpio);
762 }
763
764 static void gpio_mask_irq(struct irq_data *d)
765 {
766 unsigned int gpio = d->irq - IH_GPIO_BASE;
767 struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
768 unsigned long flags;
769
770 spin_lock_irqsave(&bank->lock, flags);
771 _set_gpio_irqenable(bank, gpio, 0);
772 _set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), IRQ_TYPE_NONE);
773 spin_unlock_irqrestore(&bank->lock, flags);
774 }
775
776 static void gpio_unmask_irq(struct irq_data *d)
777 {
778 unsigned int gpio = d->irq - IH_GPIO_BASE;
779 struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
780 unsigned int irq_mask = GPIO_BIT(bank, gpio);
781 u32 trigger = irqd_get_trigger_type(d);
782 unsigned long flags;
783
784 spin_lock_irqsave(&bank->lock, flags);
785 if (trigger)
786 _set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), trigger);
787
788 /* For level-triggered GPIOs, the clearing must be done after
789 * the HW source is cleared, thus after the handler has run */
790 if (bank->level_mask & irq_mask) {
791 _set_gpio_irqenable(bank, gpio, 0);
792 _clear_gpio_irqstatus(bank, gpio);
793 }
794
795 _set_gpio_irqenable(bank, gpio, 1);
796 spin_unlock_irqrestore(&bank->lock, flags);
797 }
798
799 static struct irq_chip gpio_irq_chip = {
800 .name = "GPIO",
801 .irq_shutdown = gpio_irq_shutdown,
802 .irq_ack = gpio_ack_irq,
803 .irq_mask = gpio_mask_irq,
804 .irq_unmask = gpio_unmask_irq,
805 .irq_set_type = gpio_irq_type,
806 .irq_set_wake = gpio_wake_enable,
807 };
808
809 /*---------------------------------------------------------------------*/
810
811 #ifdef CONFIG_ARCH_OMAP1
812
813 #define bank_is_mpuio(bank) ((bank)->method == METHOD_MPUIO)
814
815 #ifdef CONFIG_ARCH_OMAP16XX
816
817 #include <linux/platform_device.h>
818
819 static int omap_mpuio_suspend_noirq(struct device *dev)
820 {
821 struct platform_device *pdev = to_platform_device(dev);
822 struct gpio_bank *bank = platform_get_drvdata(pdev);
823 void __iomem *mask_reg = bank->base +
824 OMAP_MPUIO_GPIO_MASKIT / bank->stride;
825 unsigned long flags;
826
827 spin_lock_irqsave(&bank->lock, flags);
828 bank->saved_wakeup = __raw_readl(mask_reg);
829 __raw_writel(0xffff & ~bank->suspend_wakeup, mask_reg);
830 spin_unlock_irqrestore(&bank->lock, flags);
831
832 return 0;
833 }
834
835 static int omap_mpuio_resume_noirq(struct device *dev)
836 {
837 struct platform_device *pdev = to_platform_device(dev);
838 struct gpio_bank *bank = platform_get_drvdata(pdev);
839 void __iomem *mask_reg = bank->base +
840 OMAP_MPUIO_GPIO_MASKIT / bank->stride;
841 unsigned long flags;
842
843 spin_lock_irqsave(&bank->lock, flags);
844 __raw_writel(bank->saved_wakeup, mask_reg);
845 spin_unlock_irqrestore(&bank->lock, flags);
846
847 return 0;
848 }
849
850 static const struct dev_pm_ops omap_mpuio_dev_pm_ops = {
851 .suspend_noirq = omap_mpuio_suspend_noirq,
852 .resume_noirq = omap_mpuio_resume_noirq,
853 };
854
855 /* use platform_driver for this. */
856 static struct platform_driver omap_mpuio_driver = {
857 .driver = {
858 .name = "mpuio",
859 .pm = &omap_mpuio_dev_pm_ops,
860 },
861 };
862
863 static struct platform_device omap_mpuio_device = {
864 .name = "mpuio",
865 .id = -1,
866 .dev = {
867 .driver = &omap_mpuio_driver.driver,
868 }
869 /* could list the /proc/iomem resources */
870 };
871
872 static inline void mpuio_init(void)
873 {
874 struct gpio_bank *bank = &gpio_bank[0];
875 platform_set_drvdata(&omap_mpuio_device, bank);
876
877 if (platform_driver_register(&omap_mpuio_driver) == 0)
878 (void) platform_device_register(&omap_mpuio_device);
879 }
880
881 #else
882 static inline void mpuio_init(void) {}
883 #endif /* 16xx */
884
885 #else
886
887 #define bank_is_mpuio(bank) 0
888 static inline void mpuio_init(void) {}
889
890 #endif
891
892 /*---------------------------------------------------------------------*/
893
894 /* REVISIT these are stupid implementations! replace by ones that
895 * don't switch on METHOD_* and which mostly avoid spinlocks
896 */
897
898 static int gpio_input(struct gpio_chip *chip, unsigned offset)
899 {
900 struct gpio_bank *bank;
901 unsigned long flags;
902
903 bank = container_of(chip, struct gpio_bank, chip);
904 spin_lock_irqsave(&bank->lock, flags);
905 _set_gpio_direction(bank, offset, 1);
906 spin_unlock_irqrestore(&bank->lock, flags);
907 return 0;
908 }
909
910 static int gpio_is_input(struct gpio_bank *bank, int mask)
911 {
912 void __iomem *reg = bank->base + bank->regs->direction;
913
914 return __raw_readl(reg) & mask;
915 }
916
917 static int gpio_get(struct gpio_chip *chip, unsigned offset)
918 {
919 struct gpio_bank *bank;
920 void __iomem *reg;
921 int gpio;
922 u32 mask;
923
924 gpio = chip->base + offset;
925 bank = container_of(chip, struct gpio_bank, chip);
926 reg = bank->base;
927 mask = GPIO_BIT(bank, gpio);
928
929 if (gpio_is_input(bank, mask))
930 return _get_gpio_datain(bank, gpio);
931 else
932 return _get_gpio_dataout(bank, gpio);
933 }
934
935 static int gpio_output(struct gpio_chip *chip, unsigned offset, int value)
936 {
937 struct gpio_bank *bank;
938 unsigned long flags;
939
940 bank = container_of(chip, struct gpio_bank, chip);
941 spin_lock_irqsave(&bank->lock, flags);
942 bank->set_dataout(bank, offset, value);
943 _set_gpio_direction(bank, offset, 0);
944 spin_unlock_irqrestore(&bank->lock, flags);
945 return 0;
946 }
947
948 static int gpio_debounce(struct gpio_chip *chip, unsigned offset,
949 unsigned debounce)
950 {
951 struct gpio_bank *bank;
952 unsigned long flags;
953
954 bank = container_of(chip, struct gpio_bank, chip);
955
956 if (!bank->dbck) {
957 bank->dbck = clk_get(bank->dev, "dbclk");
958 if (IS_ERR(bank->dbck))
959 dev_err(bank->dev, "Could not get gpio dbck\n");
960 }
961
962 spin_lock_irqsave(&bank->lock, flags);
963 _set_gpio_debounce(bank, offset, debounce);
964 spin_unlock_irqrestore(&bank->lock, flags);
965
966 return 0;
967 }
968
969 static void gpio_set(struct gpio_chip *chip, unsigned offset, int value)
970 {
971 struct gpio_bank *bank;
972 unsigned long flags;
973
974 bank = container_of(chip, struct gpio_bank, chip);
975 spin_lock_irqsave(&bank->lock, flags);
976 bank->set_dataout(bank, offset, value);
977 spin_unlock_irqrestore(&bank->lock, flags);
978 }
979
980 static int gpio_2irq(struct gpio_chip *chip, unsigned offset)
981 {
982 struct gpio_bank *bank;
983
984 bank = container_of(chip, struct gpio_bank, chip);
985 return bank->virtual_irq_start + offset;
986 }
987
988 /*---------------------------------------------------------------------*/
989
990 static void __init omap_gpio_show_rev(struct gpio_bank *bank)
991 {
992 static bool called;
993 u32 rev;
994
995 if (called || bank->regs->revision == USHRT_MAX)
996 return;
997
998 rev = __raw_readw(bank->base + bank->regs->revision);
999 pr_info("OMAP GPIO hardware version %d.%d\n",
1000 (rev >> 4) & 0x0f, rev & 0x0f);
1001
1002 called = true;
1003 }
1004
1005 /* This lock class tells lockdep that GPIO irqs are in a different
1006 * category than their parents, so it won't report false recursion.
1007 */
1008 static struct lock_class_key gpio_lock_class;
1009
1010 static inline int init_gpio_info(struct platform_device *pdev)
1011 {
1012 /* TODO: Analyze removing gpio_bank_count usage from driver code */
1013 gpio_bank = kzalloc(gpio_bank_count * sizeof(struct gpio_bank),
1014 GFP_KERNEL);
1015 if (!gpio_bank) {
1016 dev_err(&pdev->dev, "Memory alloc failed for gpio_bank\n");
1017 return -ENOMEM;
1018 }
1019 return 0;
1020 }
1021
1022 /* TODO: Cleanup cpu_is_* checks */
1023 static void omap_gpio_mod_init(struct gpio_bank *bank, int id)
1024 {
1025 if (cpu_class_is_omap2()) {
1026 if (cpu_is_omap44xx()) {
1027 __raw_writel(0xffffffff, bank->base +
1028 OMAP4_GPIO_IRQSTATUSCLR0);
1029 __raw_writel(0x00000000, bank->base +
1030 OMAP4_GPIO_DEBOUNCENABLE);
1031 /* Initialize interface clk ungated, module enabled */
1032 __raw_writel(0, bank->base + OMAP4_GPIO_CTRL);
1033 } else if (cpu_is_omap34xx()) {
1034 __raw_writel(0x00000000, bank->base +
1035 OMAP24XX_GPIO_IRQENABLE1);
1036 __raw_writel(0xffffffff, bank->base +
1037 OMAP24XX_GPIO_IRQSTATUS1);
1038 __raw_writel(0x00000000, bank->base +
1039 OMAP24XX_GPIO_DEBOUNCE_EN);
1040
1041 /* Initialize interface clk ungated, module enabled */
1042 __raw_writel(0, bank->base + OMAP24XX_GPIO_CTRL);
1043 } else if (cpu_is_omap24xx()) {
1044 static const u32 non_wakeup_gpios[] = {
1045 0xe203ffc0, 0x08700040
1046 };
1047 if (id < ARRAY_SIZE(non_wakeup_gpios))
1048 bank->non_wakeup_gpios = non_wakeup_gpios[id];
1049 }
1050 } else if (cpu_class_is_omap1()) {
1051 if (bank_is_mpuio(bank))
1052 __raw_writew(0xffff, bank->base +
1053 OMAP_MPUIO_GPIO_MASKIT / bank->stride);
1054 if (cpu_is_omap15xx() && bank->method == METHOD_GPIO_1510) {
1055 __raw_writew(0xffff, bank->base
1056 + OMAP1510_GPIO_INT_MASK);
1057 __raw_writew(0x0000, bank->base
1058 + OMAP1510_GPIO_INT_STATUS);
1059 }
1060 if (cpu_is_omap16xx() && bank->method == METHOD_GPIO_1610) {
1061 __raw_writew(0x0000, bank->base
1062 + OMAP1610_GPIO_IRQENABLE1);
1063 __raw_writew(0xffff, bank->base
1064 + OMAP1610_GPIO_IRQSTATUS1);
1065 __raw_writew(0x0014, bank->base
1066 + OMAP1610_GPIO_SYSCONFIG);
1067
1068 /*
1069 * Enable system clock for GPIO module.
1070 * The CAM_CLK_CTRL *is* really the right place.
1071 */
1072 omap_writel(omap_readl(ULPD_CAM_CLK_CTRL) | 0x04,
1073 ULPD_CAM_CLK_CTRL);
1074 }
1075 if (cpu_is_omap7xx() && bank->method == METHOD_GPIO_7XX) {
1076 __raw_writel(0xffffffff, bank->base
1077 + OMAP7XX_GPIO_INT_MASK);
1078 __raw_writel(0x00000000, bank->base
1079 + OMAP7XX_GPIO_INT_STATUS);
1080 }
1081 }
1082 }
1083
1084 static __init void
1085 omap_mpuio_alloc_gc(struct gpio_bank *bank, unsigned int irq_start,
1086 unsigned int num)
1087 {
1088 struct irq_chip_generic *gc;
1089 struct irq_chip_type *ct;
1090
1091 gc = irq_alloc_generic_chip("MPUIO", 1, irq_start, bank->base,
1092 handle_simple_irq);
1093 if (!gc) {
1094 dev_err(bank->dev, "Memory alloc failed for gc\n");
1095 return;
1096 }
1097
1098 ct = gc->chip_types;
1099
1100 /* NOTE: No ack required, reading IRQ status clears it. */
1101 ct->chip.irq_mask = irq_gc_mask_set_bit;
1102 ct->chip.irq_unmask = irq_gc_mask_clr_bit;
1103 ct->chip.irq_set_type = gpio_irq_type;
1104 /* REVISIT: assuming only 16xx supports MPUIO wake events */
1105 if (cpu_is_omap16xx())
1106 ct->chip.irq_set_wake = gpio_wake_enable,
1107
1108 ct->regs.mask = OMAP_MPUIO_GPIO_INT / bank->stride;
1109 irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE,
1110 IRQ_NOREQUEST | IRQ_NOPROBE, 0);
1111 }
1112
1113 static void __devinit omap_gpio_chip_init(struct gpio_bank *bank)
1114 {
1115 int j;
1116 static int gpio;
1117
1118 bank->mod_usage = 0;
1119 /*
1120 * REVISIT eventually switch from OMAP-specific gpio structs
1121 * over to the generic ones
1122 */
1123 bank->chip.request = omap_gpio_request;
1124 bank->chip.free = omap_gpio_free;
1125 bank->chip.direction_input = gpio_input;
1126 bank->chip.get = gpio_get;
1127 bank->chip.direction_output = gpio_output;
1128 bank->chip.set_debounce = gpio_debounce;
1129 bank->chip.set = gpio_set;
1130 bank->chip.to_irq = gpio_2irq;
1131 if (bank_is_mpuio(bank)) {
1132 bank->chip.label = "mpuio";
1133 #ifdef CONFIG_ARCH_OMAP16XX
1134 bank->chip.dev = &omap_mpuio_device.dev;
1135 #endif
1136 bank->chip.base = OMAP_MPUIO(0);
1137 } else {
1138 bank->chip.label = "gpio";
1139 bank->chip.base = gpio;
1140 gpio += bank->width;
1141 }
1142 bank->chip.ngpio = bank->width;
1143
1144 gpiochip_add(&bank->chip);
1145
1146 for (j = bank->virtual_irq_start;
1147 j < bank->virtual_irq_start + bank->width; j++) {
1148 irq_set_lockdep_class(j, &gpio_lock_class);
1149 irq_set_chip_data(j, bank);
1150 if (bank_is_mpuio(bank)) {
1151 omap_mpuio_alloc_gc(bank, j, bank->width);
1152 } else {
1153 irq_set_chip(j, &gpio_irq_chip);
1154 irq_set_handler(j, handle_simple_irq);
1155 set_irq_flags(j, IRQF_VALID);
1156 }
1157 }
1158 irq_set_chained_handler(bank->irq, gpio_irq_handler);
1159 irq_set_handler_data(bank->irq, bank);
1160 }
1161
1162 static int __devinit omap_gpio_probe(struct platform_device *pdev)
1163 {
1164 static int gpio_init_done;
1165 struct omap_gpio_platform_data *pdata;
1166 struct resource *res;
1167 int id;
1168 struct gpio_bank *bank;
1169
1170 if (!pdev->dev.platform_data)
1171 return -EINVAL;
1172
1173 pdata = pdev->dev.platform_data;
1174
1175 if (!gpio_init_done) {
1176 int ret;
1177
1178 ret = init_gpio_info(pdev);
1179 if (ret)
1180 return ret;
1181 }
1182
1183 id = pdev->id;
1184 bank = &gpio_bank[id];
1185
1186 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1187 if (unlikely(!res)) {
1188 dev_err(&pdev->dev, "GPIO Bank %i Invalid IRQ resource\n", id);
1189 return -ENODEV;
1190 }
1191
1192 bank->irq = res->start;
1193 bank->virtual_irq_start = pdata->virtual_irq_start;
1194 bank->method = pdata->bank_type;
1195 bank->dev = &pdev->dev;
1196 bank->dbck_flag = pdata->dbck_flag;
1197 bank->stride = pdata->bank_stride;
1198 bank->width = pdata->bank_width;
1199
1200 bank->regs = pdata->regs;
1201
1202 if (bank->regs->set_dataout && bank->regs->clr_dataout)
1203 bank->set_dataout = _set_gpio_dataout_reg;
1204 else
1205 bank->set_dataout = _set_gpio_dataout_mask;
1206
1207 spin_lock_init(&bank->lock);
1208
1209 /* Static mapping, never released */
1210 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1211 if (unlikely(!res)) {
1212 dev_err(&pdev->dev, "GPIO Bank %i Invalid mem resource\n", id);
1213 return -ENODEV;
1214 }
1215
1216 bank->base = ioremap(res->start, resource_size(res));
1217 if (!bank->base) {
1218 dev_err(&pdev->dev, "Could not ioremap gpio bank%i\n", id);
1219 return -ENOMEM;
1220 }
1221
1222 pm_runtime_enable(bank->dev);
1223 pm_runtime_get_sync(bank->dev);
1224
1225 omap_gpio_mod_init(bank, id);
1226 omap_gpio_chip_init(bank);
1227 omap_gpio_show_rev(bank);
1228
1229 if (!gpio_init_done)
1230 gpio_init_done = 1;
1231
1232 return 0;
1233 }
1234
1235 #if defined(CONFIG_ARCH_OMAP16XX) || defined(CONFIG_ARCH_OMAP2PLUS)
1236 static int omap_gpio_suspend(void)
1237 {
1238 int i;
1239
1240 if (!cpu_class_is_omap2() && !cpu_is_omap16xx())
1241 return 0;
1242
1243 for (i = 0; i < gpio_bank_count; i++) {
1244 struct gpio_bank *bank = &gpio_bank[i];
1245 void __iomem *wake_status;
1246 void __iomem *wake_clear;
1247 void __iomem *wake_set;
1248 unsigned long flags;
1249
1250 switch (bank->method) {
1251 #ifdef CONFIG_ARCH_OMAP16XX
1252 case METHOD_GPIO_1610:
1253 wake_status = bank->base + OMAP1610_GPIO_WAKEUPENABLE;
1254 wake_clear = bank->base + OMAP1610_GPIO_CLEAR_WAKEUPENA;
1255 wake_set = bank->base + OMAP1610_GPIO_SET_WAKEUPENA;
1256 break;
1257 #endif
1258 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
1259 case METHOD_GPIO_24XX:
1260 wake_status = bank->base + OMAP24XX_GPIO_WAKE_EN;
1261 wake_clear = bank->base + OMAP24XX_GPIO_CLEARWKUENA;
1262 wake_set = bank->base + OMAP24XX_GPIO_SETWKUENA;
1263 break;
1264 #endif
1265 #ifdef CONFIG_ARCH_OMAP4
1266 case METHOD_GPIO_44XX:
1267 wake_status = bank->base + OMAP4_GPIO_IRQWAKEN0;
1268 wake_clear = bank->base + OMAP4_GPIO_IRQWAKEN0;
1269 wake_set = bank->base + OMAP4_GPIO_IRQWAKEN0;
1270 break;
1271 #endif
1272 default:
1273 continue;
1274 }
1275
1276 spin_lock_irqsave(&bank->lock, flags);
1277 bank->saved_wakeup = __raw_readl(wake_status);
1278 __raw_writel(0xffffffff, wake_clear);
1279 __raw_writel(bank->suspend_wakeup, wake_set);
1280 spin_unlock_irqrestore(&bank->lock, flags);
1281 }
1282
1283 return 0;
1284 }
1285
1286 static void omap_gpio_resume(void)
1287 {
1288 int i;
1289
1290 if (!cpu_class_is_omap2() && !cpu_is_omap16xx())
1291 return;
1292
1293 for (i = 0; i < gpio_bank_count; i++) {
1294 struct gpio_bank *bank = &gpio_bank[i];
1295 void __iomem *wake_clear;
1296 void __iomem *wake_set;
1297 unsigned long flags;
1298
1299 switch (bank->method) {
1300 #ifdef CONFIG_ARCH_OMAP16XX
1301 case METHOD_GPIO_1610:
1302 wake_clear = bank->base + OMAP1610_GPIO_CLEAR_WAKEUPENA;
1303 wake_set = bank->base + OMAP1610_GPIO_SET_WAKEUPENA;
1304 break;
1305 #endif
1306 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
1307 case METHOD_GPIO_24XX:
1308 wake_clear = bank->base + OMAP24XX_GPIO_CLEARWKUENA;
1309 wake_set = bank->base + OMAP24XX_GPIO_SETWKUENA;
1310 break;
1311 #endif
1312 #ifdef CONFIG_ARCH_OMAP4
1313 case METHOD_GPIO_44XX:
1314 wake_clear = bank->base + OMAP4_GPIO_IRQWAKEN0;
1315 wake_set = bank->base + OMAP4_GPIO_IRQWAKEN0;
1316 break;
1317 #endif
1318 default:
1319 continue;
1320 }
1321
1322 spin_lock_irqsave(&bank->lock, flags);
1323 __raw_writel(0xffffffff, wake_clear);
1324 __raw_writel(bank->saved_wakeup, wake_set);
1325 spin_unlock_irqrestore(&bank->lock, flags);
1326 }
1327 }
1328
1329 static struct syscore_ops omap_gpio_syscore_ops = {
1330 .suspend = omap_gpio_suspend,
1331 .resume = omap_gpio_resume,
1332 };
1333
1334 #endif
1335
1336 #ifdef CONFIG_ARCH_OMAP2PLUS
1337
1338 static int workaround_enabled;
1339
1340 void omap2_gpio_prepare_for_idle(int off_mode)
1341 {
1342 int i, c = 0;
1343 int min = 0;
1344
1345 if (cpu_is_omap34xx())
1346 min = 1;
1347
1348 for (i = min; i < gpio_bank_count; i++) {
1349 struct gpio_bank *bank = &gpio_bank[i];
1350 u32 l1 = 0, l2 = 0;
1351 int j;
1352
1353 for (j = 0; j < hweight_long(bank->dbck_enable_mask); j++)
1354 clk_disable(bank->dbck);
1355
1356 if (!off_mode)
1357 continue;
1358
1359 /* If going to OFF, remove triggering for all
1360 * non-wakeup GPIOs. Otherwise spurious IRQs will be
1361 * generated. See OMAP2420 Errata item 1.101. */
1362 if (!(bank->enabled_non_wakeup_gpios))
1363 continue;
1364
1365 if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
1366 bank->saved_datain = __raw_readl(bank->base +
1367 OMAP24XX_GPIO_DATAIN);
1368 l1 = __raw_readl(bank->base +
1369 OMAP24XX_GPIO_FALLINGDETECT);
1370 l2 = __raw_readl(bank->base +
1371 OMAP24XX_GPIO_RISINGDETECT);
1372 }
1373
1374 if (cpu_is_omap44xx()) {
1375 bank->saved_datain = __raw_readl(bank->base +
1376 OMAP4_GPIO_DATAIN);
1377 l1 = __raw_readl(bank->base +
1378 OMAP4_GPIO_FALLINGDETECT);
1379 l2 = __raw_readl(bank->base +
1380 OMAP4_GPIO_RISINGDETECT);
1381 }
1382
1383 bank->saved_fallingdetect = l1;
1384 bank->saved_risingdetect = l2;
1385 l1 &= ~bank->enabled_non_wakeup_gpios;
1386 l2 &= ~bank->enabled_non_wakeup_gpios;
1387
1388 if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
1389 __raw_writel(l1, bank->base +
1390 OMAP24XX_GPIO_FALLINGDETECT);
1391 __raw_writel(l2, bank->base +
1392 OMAP24XX_GPIO_RISINGDETECT);
1393 }
1394
1395 if (cpu_is_omap44xx()) {
1396 __raw_writel(l1, bank->base + OMAP4_GPIO_FALLINGDETECT);
1397 __raw_writel(l2, bank->base + OMAP4_GPIO_RISINGDETECT);
1398 }
1399
1400 c++;
1401 }
1402 if (!c) {
1403 workaround_enabled = 0;
1404 return;
1405 }
1406 workaround_enabled = 1;
1407 }
1408
1409 void omap2_gpio_resume_after_idle(void)
1410 {
1411 int i;
1412 int min = 0;
1413
1414 if (cpu_is_omap34xx())
1415 min = 1;
1416 for (i = min; i < gpio_bank_count; i++) {
1417 struct gpio_bank *bank = &gpio_bank[i];
1418 u32 l = 0, gen, gen0, gen1;
1419 int j;
1420
1421 for (j = 0; j < hweight_long(bank->dbck_enable_mask); j++)
1422 clk_enable(bank->dbck);
1423
1424 if (!workaround_enabled)
1425 continue;
1426
1427 if (!(bank->enabled_non_wakeup_gpios))
1428 continue;
1429
1430 if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
1431 __raw_writel(bank->saved_fallingdetect,
1432 bank->base + OMAP24XX_GPIO_FALLINGDETECT);
1433 __raw_writel(bank->saved_risingdetect,
1434 bank->base + OMAP24XX_GPIO_RISINGDETECT);
1435 l = __raw_readl(bank->base + OMAP24XX_GPIO_DATAIN);
1436 }
1437
1438 if (cpu_is_omap44xx()) {
1439 __raw_writel(bank->saved_fallingdetect,
1440 bank->base + OMAP4_GPIO_FALLINGDETECT);
1441 __raw_writel(bank->saved_risingdetect,
1442 bank->base + OMAP4_GPIO_RISINGDETECT);
1443 l = __raw_readl(bank->base + OMAP4_GPIO_DATAIN);
1444 }
1445
1446 /* Check if any of the non-wakeup interrupt GPIOs have changed
1447 * state. If so, generate an IRQ by software. This is
1448 * horribly racy, but it's the best we can do to work around
1449 * this silicon bug. */
1450 l ^= bank->saved_datain;
1451 l &= bank->enabled_non_wakeup_gpios;
1452
1453 /*
1454 * No need to generate IRQs for the rising edge for gpio IRQs
1455 * configured with falling edge only; and vice versa.
1456 */
1457 gen0 = l & bank->saved_fallingdetect;
1458 gen0 &= bank->saved_datain;
1459
1460 gen1 = l & bank->saved_risingdetect;
1461 gen1 &= ~(bank->saved_datain);
1462
1463 /* FIXME: Consider GPIO IRQs with level detections properly! */
1464 gen = l & (~(bank->saved_fallingdetect) &
1465 ~(bank->saved_risingdetect));
1466 /* Consider all GPIO IRQs needed to be updated */
1467 gen |= gen0 | gen1;
1468
1469 if (gen) {
1470 u32 old0, old1;
1471
1472 if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
1473 old0 = __raw_readl(bank->base +
1474 OMAP24XX_GPIO_LEVELDETECT0);
1475 old1 = __raw_readl(bank->base +
1476 OMAP24XX_GPIO_LEVELDETECT1);
1477 __raw_writel(old0 | gen, bank->base +
1478 OMAP24XX_GPIO_LEVELDETECT0);
1479 __raw_writel(old1 | gen, bank->base +
1480 OMAP24XX_GPIO_LEVELDETECT1);
1481 __raw_writel(old0, bank->base +
1482 OMAP24XX_GPIO_LEVELDETECT0);
1483 __raw_writel(old1, bank->base +
1484 OMAP24XX_GPIO_LEVELDETECT1);
1485 }
1486
1487 if (cpu_is_omap44xx()) {
1488 old0 = __raw_readl(bank->base +
1489 OMAP4_GPIO_LEVELDETECT0);
1490 old1 = __raw_readl(bank->base +
1491 OMAP4_GPIO_LEVELDETECT1);
1492 __raw_writel(old0 | l, bank->base +
1493 OMAP4_GPIO_LEVELDETECT0);
1494 __raw_writel(old1 | l, bank->base +
1495 OMAP4_GPIO_LEVELDETECT1);
1496 __raw_writel(old0, bank->base +
1497 OMAP4_GPIO_LEVELDETECT0);
1498 __raw_writel(old1, bank->base +
1499 OMAP4_GPIO_LEVELDETECT1);
1500 }
1501 }
1502 }
1503
1504 }
1505
1506 #endif
1507
1508 #ifdef CONFIG_ARCH_OMAP3
1509 /* save the registers of bank 2-6 */
1510 void omap_gpio_save_context(void)
1511 {
1512 int i;
1513
1514 /* saving banks from 2-6 only since GPIO1 is in WKUP */
1515 for (i = 1; i < gpio_bank_count; i++) {
1516 struct gpio_bank *bank = &gpio_bank[i];
1517 gpio_context[i].irqenable1 =
1518 __raw_readl(bank->base + OMAP24XX_GPIO_IRQENABLE1);
1519 gpio_context[i].irqenable2 =
1520 __raw_readl(bank->base + OMAP24XX_GPIO_IRQENABLE2);
1521 gpio_context[i].wake_en =
1522 __raw_readl(bank->base + OMAP24XX_GPIO_WAKE_EN);
1523 gpio_context[i].ctrl =
1524 __raw_readl(bank->base + OMAP24XX_GPIO_CTRL);
1525 gpio_context[i].oe =
1526 __raw_readl(bank->base + OMAP24XX_GPIO_OE);
1527 gpio_context[i].leveldetect0 =
1528 __raw_readl(bank->base + OMAP24XX_GPIO_LEVELDETECT0);
1529 gpio_context[i].leveldetect1 =
1530 __raw_readl(bank->base + OMAP24XX_GPIO_LEVELDETECT1);
1531 gpio_context[i].risingdetect =
1532 __raw_readl(bank->base + OMAP24XX_GPIO_RISINGDETECT);
1533 gpio_context[i].fallingdetect =
1534 __raw_readl(bank->base + OMAP24XX_GPIO_FALLINGDETECT);
1535 gpio_context[i].dataout =
1536 __raw_readl(bank->base + OMAP24XX_GPIO_DATAOUT);
1537 }
1538 }
1539
1540 /* restore the required registers of bank 2-6 */
1541 void omap_gpio_restore_context(void)
1542 {
1543 int i;
1544
1545 for (i = 1; i < gpio_bank_count; i++) {
1546 struct gpio_bank *bank = &gpio_bank[i];
1547 __raw_writel(gpio_context[i].irqenable1,
1548 bank->base + OMAP24XX_GPIO_IRQENABLE1);
1549 __raw_writel(gpio_context[i].irqenable2,
1550 bank->base + OMAP24XX_GPIO_IRQENABLE2);
1551 __raw_writel(gpio_context[i].wake_en,
1552 bank->base + OMAP24XX_GPIO_WAKE_EN);
1553 __raw_writel(gpio_context[i].ctrl,
1554 bank->base + OMAP24XX_GPIO_CTRL);
1555 __raw_writel(gpio_context[i].oe,
1556 bank->base + OMAP24XX_GPIO_OE);
1557 __raw_writel(gpio_context[i].leveldetect0,
1558 bank->base + OMAP24XX_GPIO_LEVELDETECT0);
1559 __raw_writel(gpio_context[i].leveldetect1,
1560 bank->base + OMAP24XX_GPIO_LEVELDETECT1);
1561 __raw_writel(gpio_context[i].risingdetect,
1562 bank->base + OMAP24XX_GPIO_RISINGDETECT);
1563 __raw_writel(gpio_context[i].fallingdetect,
1564 bank->base + OMAP24XX_GPIO_FALLINGDETECT);
1565 __raw_writel(gpio_context[i].dataout,
1566 bank->base + OMAP24XX_GPIO_DATAOUT);
1567 }
1568 }
1569 #endif
1570
1571 static struct platform_driver omap_gpio_driver = {
1572 .probe = omap_gpio_probe,
1573 .driver = {
1574 .name = "omap_gpio",
1575 },
1576 };
1577
1578 /*
1579 * gpio driver register needs to be done before
1580 * machine_init functions access gpio APIs.
1581 * Hence omap_gpio_drv_reg() is a postcore_initcall.
1582 */
1583 static int __init omap_gpio_drv_reg(void)
1584 {
1585 return platform_driver_register(&omap_gpio_driver);
1586 }
1587 postcore_initcall(omap_gpio_drv_reg);
1588
1589 static int __init omap_gpio_sysinit(void)
1590 {
1591 mpuio_init();
1592
1593 #if defined(CONFIG_ARCH_OMAP16XX) || defined(CONFIG_ARCH_OMAP2PLUS)
1594 if (cpu_is_omap16xx() || cpu_class_is_omap2())
1595 register_syscore_ops(&omap_gpio_syscore_ops);
1596 #endif
1597
1598 return 0;
1599 }
1600
1601 arch_initcall(omap_gpio_sysinit);
Linux kernel - Deliverables
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