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The discovered bit in PGCCSR register indicates if the device has been
[linux-2.6/next.git] / drivers / gpio / gpio-omap.c
blob9c27244fd680ecf06e9e3309e983a8810c83baae
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 #if defined(CONFIG_ARCH_OMAP16XX) || defined(CONFIG_ARCH_OMAP2PLUS)
38 u32 suspend_wakeup;
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 #define MOD_REG_BIT(reg, bit_mask, set) \
152 do { \
153 int l = __raw_readl(base + reg); \
154 if (set) l |= bit_mask; \
155 else l &= ~bit_mask; \
156 __raw_writel(l, base + reg); \
157 } while(0)
158
159 /**
160 * _set_gpio_debounce - low level gpio debounce time
161 * @bank: the gpio bank we're acting upon
162 * @gpio: the gpio number on this @gpio
163 * @debounce: debounce time to use
164 *
165 * OMAP's debounce time is in 31us steps so we need
166 * to convert and round up to the closest unit.
167 */
168 static void _set_gpio_debounce(struct gpio_bank *bank, unsigned gpio,
169 unsigned debounce)
170 {
171 void __iomem *reg;
172 u32 val;
173 u32 l;
174
175 if (!bank->dbck_flag)
176 return;
177
178 if (debounce < 32)
179 debounce = 0x01;
180 else if (debounce > 7936)
181 debounce = 0xff;
182 else
183 debounce = (debounce / 0x1f) - 1;
184
185 l = GPIO_BIT(bank, gpio);
186
187 reg = bank->base + bank->regs->debounce;
188 __raw_writel(debounce, reg);
189
190 reg = bank->base + bank->regs->debounce_en;
191 val = __raw_readl(reg);
192
193 if (debounce) {
194 val |= l;
195 clk_enable(bank->dbck);
196 } else {
197 val &= ~l;
198 clk_disable(bank->dbck);
199 }
200 bank->dbck_enable_mask = val;
201
202 __raw_writel(val, reg);
203 }
204
205 #ifdef CONFIG_ARCH_OMAP2PLUS
206 static inline void set_24xx_gpio_triggering(struct gpio_bank *bank, int gpio,
207 int trigger)
208 {
209 void __iomem *base = bank->base;
210 u32 gpio_bit = 1 << gpio;
211
212 if (cpu_is_omap44xx()) {
213 MOD_REG_BIT(OMAP4_GPIO_LEVELDETECT0, gpio_bit,
214 trigger & IRQ_TYPE_LEVEL_LOW);
215 MOD_REG_BIT(OMAP4_GPIO_LEVELDETECT1, gpio_bit,
216 trigger & IRQ_TYPE_LEVEL_HIGH);
217 MOD_REG_BIT(OMAP4_GPIO_RISINGDETECT, gpio_bit,
218 trigger & IRQ_TYPE_EDGE_RISING);
219 MOD_REG_BIT(OMAP4_GPIO_FALLINGDETECT, gpio_bit,
220 trigger & IRQ_TYPE_EDGE_FALLING);
221 } else {
222 MOD_REG_BIT(OMAP24XX_GPIO_LEVELDETECT0, gpio_bit,
223 trigger & IRQ_TYPE_LEVEL_LOW);
224 MOD_REG_BIT(OMAP24XX_GPIO_LEVELDETECT1, gpio_bit,
225 trigger & IRQ_TYPE_LEVEL_HIGH);
226 MOD_REG_BIT(OMAP24XX_GPIO_RISINGDETECT, gpio_bit,
227 trigger & IRQ_TYPE_EDGE_RISING);
228 MOD_REG_BIT(OMAP24XX_GPIO_FALLINGDETECT, gpio_bit,
229 trigger & IRQ_TYPE_EDGE_FALLING);
230 }
231 if (likely(!(bank->non_wakeup_gpios & gpio_bit))) {
232 if (cpu_is_omap44xx()) {
233 MOD_REG_BIT(OMAP4_GPIO_IRQWAKEN0, gpio_bit,
234 trigger != 0);
235 } else {
236 /*
237 * GPIO wakeup request can only be generated on edge
238 * transitions
239 */
240 if (trigger & IRQ_TYPE_EDGE_BOTH)
241 __raw_writel(1 << gpio, bank->base
242 + OMAP24XX_GPIO_SETWKUENA);
243 else
244 __raw_writel(1 << gpio, bank->base
245 + OMAP24XX_GPIO_CLEARWKUENA);
246 }
247 }
248 /* This part needs to be executed always for OMAP{34xx, 44xx} */
249 if (cpu_is_omap34xx() || cpu_is_omap44xx() ||
250 (bank->non_wakeup_gpios & gpio_bit)) {
251 /*
252 * Log the edge gpio and manually trigger the IRQ
253 * after resume if the input level changes
254 * to avoid irq lost during PER RET/OFF mode
255 * Applies for omap2 non-wakeup gpio and all omap3 gpios
256 */
257 if (trigger & IRQ_TYPE_EDGE_BOTH)
258 bank->enabled_non_wakeup_gpios |= gpio_bit;
259 else
260 bank->enabled_non_wakeup_gpios &= ~gpio_bit;
261 }
262
263 if (cpu_is_omap44xx()) {
264 bank->level_mask =
265 __raw_readl(bank->base + OMAP4_GPIO_LEVELDETECT0) |
266 __raw_readl(bank->base + OMAP4_GPIO_LEVELDETECT1);
267 } else {
268 bank->level_mask =
269 __raw_readl(bank->base + OMAP24XX_GPIO_LEVELDETECT0) |
270 __raw_readl(bank->base + OMAP24XX_GPIO_LEVELDETECT1);
271 }
272 }
273 #endif
274
275 #ifdef CONFIG_ARCH_OMAP1
276 /*
277 * This only applies to chips that can't do both rising and falling edge
278 * detection at once. For all other chips, this function is a noop.
279 */
280 static void _toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio)
281 {
282 void __iomem *reg = bank->base;
283 u32 l = 0;
284
285 switch (bank->method) {
286 case METHOD_MPUIO:
287 reg += OMAP_MPUIO_GPIO_INT_EDGE / bank->stride;
288 break;
289 #ifdef CONFIG_ARCH_OMAP15XX
290 case METHOD_GPIO_1510:
291 reg += OMAP1510_GPIO_INT_CONTROL;
292 break;
293 #endif
294 #if defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP850)
295 case METHOD_GPIO_7XX:
296 reg += OMAP7XX_GPIO_INT_CONTROL;
297 break;
298 #endif
299 default:
300 return;
301 }
302
303 l = __raw_readl(reg);
304 if ((l >> gpio) & 1)
305 l &= ~(1 << gpio);
306 else
307 l |= 1 << gpio;
308
309 __raw_writel(l, reg);
310 }
311 #endif
312
313 static int _set_gpio_triggering(struct gpio_bank *bank, int gpio, int trigger)
314 {
315 void __iomem *reg = bank->base;
316 u32 l = 0;
317
318 switch (bank->method) {
319 #ifdef CONFIG_ARCH_OMAP1
320 case METHOD_MPUIO:
321 reg += OMAP_MPUIO_GPIO_INT_EDGE / bank->stride;
322 l = __raw_readl(reg);
323 if ((trigger & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH)
324 bank->toggle_mask |= 1 << gpio;
325 if (trigger & IRQ_TYPE_EDGE_RISING)
326 l |= 1 << gpio;
327 else if (trigger & IRQ_TYPE_EDGE_FALLING)
328 l &= ~(1 << gpio);
329 else
330 goto bad;
331 break;
332 #endif
333 #ifdef CONFIG_ARCH_OMAP15XX
334 case METHOD_GPIO_1510:
335 reg += OMAP1510_GPIO_INT_CONTROL;
336 l = __raw_readl(reg);
337 if ((trigger & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH)
338 bank->toggle_mask |= 1 << gpio;
339 if (trigger & IRQ_TYPE_EDGE_RISING)
340 l |= 1 << gpio;
341 else if (trigger & IRQ_TYPE_EDGE_FALLING)
342 l &= ~(1 << gpio);
343 else
344 goto bad;
345 break;
346 #endif
347 #ifdef CONFIG_ARCH_OMAP16XX
348 case METHOD_GPIO_1610:
349 if (gpio & 0x08)
350 reg += OMAP1610_GPIO_EDGE_CTRL2;
351 else
352 reg += OMAP1610_GPIO_EDGE_CTRL1;
353 gpio &= 0x07;
354 l = __raw_readl(reg);
355 l &= ~(3 << (gpio << 1));
356 if (trigger & IRQ_TYPE_EDGE_RISING)
357 l |= 2 << (gpio << 1);
358 if (trigger & IRQ_TYPE_EDGE_FALLING)
359 l |= 1 << (gpio << 1);
360 if (trigger)
361 /* Enable wake-up during idle for dynamic tick */
362 __raw_writel(1 << gpio, bank->base + OMAP1610_GPIO_SET_WAKEUPENA);
363 else
364 __raw_writel(1 << gpio, bank->base + OMAP1610_GPIO_CLEAR_WAKEUPENA);
365 break;
366 #endif
367 #if defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP850)
368 case METHOD_GPIO_7XX:
369 reg += OMAP7XX_GPIO_INT_CONTROL;
370 l = __raw_readl(reg);
371 if ((trigger & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH)
372 bank->toggle_mask |= 1 << gpio;
373 if (trigger & IRQ_TYPE_EDGE_RISING)
374 l |= 1 << gpio;
375 else if (trigger & IRQ_TYPE_EDGE_FALLING)
376 l &= ~(1 << gpio);
377 else
378 goto bad;
379 break;
380 #endif
381 #ifdef CONFIG_ARCH_OMAP2PLUS
382 case METHOD_GPIO_24XX:
383 case METHOD_GPIO_44XX:
384 set_24xx_gpio_triggering(bank, gpio, trigger);
385 return 0;
386 #endif
387 default:
388 goto bad;
389 }
390 __raw_writel(l, reg);
391 return 0;
392 bad:
393 return -EINVAL;
394 }
395
396 static int gpio_irq_type(struct irq_data *d, unsigned type)
397 {
398 struct gpio_bank *bank;
399 unsigned gpio;
400 int retval;
401 unsigned long flags;
402
403 if (!cpu_class_is_omap2() && d->irq > IH_MPUIO_BASE)
404 gpio = OMAP_MPUIO(d->irq - IH_MPUIO_BASE);
405 else
406 gpio = d->irq - IH_GPIO_BASE;
407
408 if (type & ~IRQ_TYPE_SENSE_MASK)
409 return -EINVAL;
410
411 /* OMAP1 allows only only edge triggering */
412 if (!cpu_class_is_omap2()
413 && (type & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH)))
414 return -EINVAL;
415
416 bank = irq_data_get_irq_chip_data(d);
417 spin_lock_irqsave(&bank->lock, flags);
418 retval = _set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), type);
419 spin_unlock_irqrestore(&bank->lock, flags);
420
421 if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
422 __irq_set_handler_locked(d->irq, handle_level_irq);
423 else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
424 __irq_set_handler_locked(d->irq, handle_edge_irq);
425
426 return retval;
427 }
428
429 static void _clear_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
430 {
431 void __iomem *reg = bank->base;
432
433 reg += bank->regs->irqstatus;
434 __raw_writel(gpio_mask, reg);
435
436 /* Workaround for clearing DSP GPIO interrupts to allow retention */
437 if (bank->regs->irqstatus2) {
438 reg = bank->base + bank->regs->irqstatus2;
439 __raw_writel(gpio_mask, reg);
440 }
441
442 /* Flush posted write for the irq status to avoid spurious interrupts */
443 __raw_readl(reg);
444 }
445
446 static inline void _clear_gpio_irqstatus(struct gpio_bank *bank, int gpio)
447 {
448 _clear_gpio_irqbank(bank, GPIO_BIT(bank, gpio));
449 }
450
451 static u32 _get_gpio_irqbank_mask(struct gpio_bank *bank)
452 {
453 void __iomem *reg = bank->base;
454 u32 l;
455 u32 mask = (1 << bank->width) - 1;
456
457 reg += bank->regs->irqenable;
458 l = __raw_readl(reg);
459 if (bank->regs->irqenable_inv)
460 l = ~l;
461 l &= mask;
462 return l;
463 }
464
465 static void _enable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
466 {
467 void __iomem *reg = bank->base;
468 u32 l;
469
470 if (bank->regs->set_irqenable) {
471 reg += bank->regs->set_irqenable;
472 l = gpio_mask;
473 } else {
474 reg += bank->regs->irqenable;
475 l = __raw_readl(reg);
476 if (bank->regs->irqenable_inv)
477 l &= ~gpio_mask;
478 else
479 l |= gpio_mask;
480 }
481
482 __raw_writel(l, reg);
483 }
484
485 static void _disable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
486 {
487 void __iomem *reg = bank->base;
488 u32 l;
489
490 if (bank->regs->clr_irqenable) {
491 reg += bank->regs->clr_irqenable;
492 l = gpio_mask;
493 } else {
494 reg += bank->regs->irqenable;
495 l = __raw_readl(reg);
496 if (bank->regs->irqenable_inv)
497 l |= gpio_mask;
498 else
499 l &= ~gpio_mask;
500 }
501
502 __raw_writel(l, reg);
503 }
504
505 static inline void _set_gpio_irqenable(struct gpio_bank *bank, int gpio, int enable)
506 {
507 _enable_gpio_irqbank(bank, GPIO_BIT(bank, gpio));
508 }
509
510 /*
511 * Note that ENAWAKEUP needs to be enabled in GPIO_SYSCONFIG register.
512 * 1510 does not seem to have a wake-up register. If JTAG is connected
513 * to the target, system will wake up always on GPIO events. While
514 * system is running all registered GPIO interrupts need to have wake-up
515 * enabled. When system is suspended, only selected GPIO interrupts need
516 * to have wake-up enabled.
517 */
518 static int _set_gpio_wakeup(struct gpio_bank *bank, int gpio, int enable)
519 {
520 u32 gpio_bit = GPIO_BIT(bank, gpio);
521 unsigned long flags;
522
523 if (bank->non_wakeup_gpios & gpio_bit) {
524 dev_err(bank->dev,
525 "Unable to modify wakeup on non-wakeup GPIO%d\n", gpio);
526 return -EINVAL;
527 }
528
529 spin_lock_irqsave(&bank->lock, flags);
530 if (enable)
531 bank->suspend_wakeup |= gpio_bit;
532 else
533 bank->suspend_wakeup &= ~gpio_bit;
534
535 spin_unlock_irqrestore(&bank->lock, flags);
536
537 return 0;
538 }
539
540 static void _reset_gpio(struct gpio_bank *bank, int gpio)
541 {
542 _set_gpio_direction(bank, GPIO_INDEX(bank, gpio), 1);
543 _set_gpio_irqenable(bank, gpio, 0);
544 _clear_gpio_irqstatus(bank, gpio);
545 _set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), IRQ_TYPE_NONE);
546 }
547
548 /* Use disable_irq_wake() and enable_irq_wake() functions from drivers */
549 static int gpio_wake_enable(struct irq_data *d, unsigned int enable)
550 {
551 unsigned int gpio = d->irq - IH_GPIO_BASE;
552 struct gpio_bank *bank;
553 int retval;
554
555 bank = irq_data_get_irq_chip_data(d);
556 retval = _set_gpio_wakeup(bank, gpio, enable);
557
558 return retval;
559 }
560
561 static int omap_gpio_request(struct gpio_chip *chip, unsigned offset)
562 {
563 struct gpio_bank *bank = container_of(chip, struct gpio_bank, chip);
564 unsigned long flags;
565
566 spin_lock_irqsave(&bank->lock, flags);
567
568 /* Set trigger to none. You need to enable the desired trigger with
569 * request_irq() or set_irq_type().
570 */
571 _set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);
572
573 #ifdef CONFIG_ARCH_OMAP15XX
574 if (bank->method == METHOD_GPIO_1510) {
575 void __iomem *reg;
576
577 /* Claim the pin for MPU */
578 reg = bank->base + OMAP1510_GPIO_PIN_CONTROL;
579 __raw_writel(__raw_readl(reg) | (1 << offset), reg);
580 }
581 #endif
582 if (!cpu_class_is_omap1()) {
583 if (!bank->mod_usage) {
584 void __iomem *reg = bank->base;
585 u32 ctrl;
586
587 if (cpu_is_omap24xx() || cpu_is_omap34xx())
588 reg += OMAP24XX_GPIO_CTRL;
589 else if (cpu_is_omap44xx())
590 reg += OMAP4_GPIO_CTRL;
591 ctrl = __raw_readl(reg);
592 /* Module is enabled, clocks are not gated */
593 ctrl &= 0xFFFFFFFE;
594 __raw_writel(ctrl, reg);
595 }
596 bank->mod_usage |= 1 << offset;
597 }
598 spin_unlock_irqrestore(&bank->lock, flags);
599
600 return 0;
601 }
602
603 static void omap_gpio_free(struct gpio_chip *chip, unsigned offset)
604 {
605 struct gpio_bank *bank = container_of(chip, struct gpio_bank, chip);
606 unsigned long flags;
607
608 spin_lock_irqsave(&bank->lock, flags);
609 #ifdef CONFIG_ARCH_OMAP16XX
610 if (bank->method == METHOD_GPIO_1610) {
611 /* Disable wake-up during idle for dynamic tick */
612 void __iomem *reg = bank->base + OMAP1610_GPIO_CLEAR_WAKEUPENA;
613 __raw_writel(1 << offset, reg);
614 }
615 #endif
616 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
617 if (bank->method == METHOD_GPIO_24XX) {
618 /* Disable wake-up during idle for dynamic tick */
619 void __iomem *reg = bank->base + OMAP24XX_GPIO_CLEARWKUENA;
620 __raw_writel(1 << offset, reg);
621 }
622 #endif
623 #ifdef CONFIG_ARCH_OMAP4
624 if (bank->method == METHOD_GPIO_44XX) {
625 /* Disable wake-up during idle for dynamic tick */
626 void __iomem *reg = bank->base + OMAP4_GPIO_IRQWAKEN0;
627 __raw_writel(1 << offset, reg);
628 }
629 #endif
630 if (!cpu_class_is_omap1()) {
631 bank->mod_usage &= ~(1 << offset);
632 if (!bank->mod_usage) {
633 void __iomem *reg = bank->base;
634 u32 ctrl;
635
636 if (cpu_is_omap24xx() || cpu_is_omap34xx())
637 reg += OMAP24XX_GPIO_CTRL;
638 else if (cpu_is_omap44xx())
639 reg += OMAP4_GPIO_CTRL;
640 ctrl = __raw_readl(reg);
641 /* Module is disabled, clocks are gated */
642 ctrl |= 1;
643 __raw_writel(ctrl, reg);
644 }
645 }
646 _reset_gpio(bank, bank->chip.base + offset);
647 spin_unlock_irqrestore(&bank->lock, flags);
648 }
649
650 /*
651 * We need to unmask the GPIO bank interrupt as soon as possible to
652 * avoid missing GPIO interrupts for other lines in the bank.
653 * Then we need to mask-read-clear-unmask the triggered GPIO lines
654 * in the bank to avoid missing nested interrupts for a GPIO line.
655 * If we wait to unmask individual GPIO lines in the bank after the
656 * line's interrupt handler has been run, we may miss some nested
657 * interrupts.
658 */
659 static void gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
660 {
661 void __iomem *isr_reg = NULL;
662 u32 isr;
663 unsigned int gpio_irq, gpio_index;
664 struct gpio_bank *bank;
665 u32 retrigger = 0;
666 int unmasked = 0;
667 struct irq_chip *chip = irq_desc_get_chip(desc);
668
669 chained_irq_enter(chip, desc);
670
671 bank = irq_get_handler_data(irq);
672 isr_reg = bank->base + bank->regs->irqstatus;
673
674 if (WARN_ON(!isr_reg))
675 goto exit;
676
677 while(1) {
678 u32 isr_saved, level_mask = 0;
679 u32 enabled;
680
681 enabled = _get_gpio_irqbank_mask(bank);
682 isr_saved = isr = __raw_readl(isr_reg) & enabled;
683
684 if (cpu_is_omap15xx() && (bank->method == METHOD_MPUIO))
685 isr &= 0x0000ffff;
686
687 if (cpu_class_is_omap2()) {
688 level_mask = bank->level_mask & enabled;
689 }
690
691 /* clear edge sensitive interrupts before handler(s) are
692 called so that we don't miss any interrupt occurred while
693 executing them */
694 _disable_gpio_irqbank(bank, isr_saved & ~level_mask);
695 _clear_gpio_irqbank(bank, isr_saved & ~level_mask);
696 _enable_gpio_irqbank(bank, isr_saved & ~level_mask);
697
698 /* if there is only edge sensitive GPIO pin interrupts
699 configured, we could unmask GPIO bank interrupt immediately */
700 if (!level_mask && !unmasked) {
701 unmasked = 1;
702 chained_irq_exit(chip, desc);
703 }
704
705 isr |= retrigger;
706 retrigger = 0;
707 if (!isr)
708 break;
709
710 gpio_irq = bank->virtual_irq_start;
711 for (; isr != 0; isr >>= 1, gpio_irq++) {
712 gpio_index = GPIO_INDEX(bank, irq_to_gpio(gpio_irq));
713
714 if (!(isr & 1))
715 continue;
716
717 #ifdef CONFIG_ARCH_OMAP1
718 /*
719 * Some chips can't respond to both rising and falling
720 * at the same time. If this irq was requested with
721 * both flags, we need to flip the ICR data for the IRQ
722 * to respond to the IRQ for the opposite direction.
723 * This will be indicated in the bank toggle_mask.
724 */
725 if (bank->toggle_mask & (1 << gpio_index))
726 _toggle_gpio_edge_triggering(bank, gpio_index);
727 #endif
728
729 generic_handle_irq(gpio_irq);
730 }
731 }
732 /* if bank has any level sensitive GPIO pin interrupt
733 configured, we must unmask the bank interrupt only after
734 handler(s) are executed in order to avoid spurious bank
735 interrupt */
736 exit:
737 if (!unmasked)
738 chained_irq_exit(chip, desc);
739 }
740
741 static void gpio_irq_shutdown(struct irq_data *d)
742 {
743 unsigned int gpio = d->irq - IH_GPIO_BASE;
744 struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
745 unsigned long flags;
746
747 spin_lock_irqsave(&bank->lock, flags);
748 _reset_gpio(bank, gpio);
749 spin_unlock_irqrestore(&bank->lock, flags);
750 }
751
752 static void gpio_ack_irq(struct irq_data *d)
753 {
754 unsigned int gpio = d->irq - IH_GPIO_BASE;
755 struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
756
757 _clear_gpio_irqstatus(bank, gpio);
758 }
759
760 static void gpio_mask_irq(struct irq_data *d)
761 {
762 unsigned int gpio = d->irq - IH_GPIO_BASE;
763 struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
764 unsigned long flags;
765
766 spin_lock_irqsave(&bank->lock, flags);
767 _set_gpio_irqenable(bank, gpio, 0);
768 _set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), IRQ_TYPE_NONE);
769 spin_unlock_irqrestore(&bank->lock, flags);
770 }
771
772 static void gpio_unmask_irq(struct irq_data *d)
773 {
774 unsigned int gpio = d->irq - IH_GPIO_BASE;
775 struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
776 unsigned int irq_mask = GPIO_BIT(bank, gpio);
777 u32 trigger = irqd_get_trigger_type(d);
778 unsigned long flags;
779
780 spin_lock_irqsave(&bank->lock, flags);
781 if (trigger)
782 _set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), trigger);
783
784 /* For level-triggered GPIOs, the clearing must be done after
785 * the HW source is cleared, thus after the handler has run */
786 if (bank->level_mask & irq_mask) {
787 _set_gpio_irqenable(bank, gpio, 0);
788 _clear_gpio_irqstatus(bank, gpio);
789 }
790
791 _set_gpio_irqenable(bank, gpio, 1);
792 spin_unlock_irqrestore(&bank->lock, flags);
793 }
794
795 static struct irq_chip gpio_irq_chip = {
796 .name = "GPIO",
797 .irq_shutdown = gpio_irq_shutdown,
798 .irq_ack = gpio_ack_irq,
799 .irq_mask = gpio_mask_irq,
800 .irq_unmask = gpio_unmask_irq,
801 .irq_set_type = gpio_irq_type,
802 .irq_set_wake = gpio_wake_enable,
803 };
804
805 /*---------------------------------------------------------------------*/
806
807 #ifdef CONFIG_ARCH_OMAP1
808
809 #define bank_is_mpuio(bank) ((bank)->method == METHOD_MPUIO)
810
811 #ifdef CONFIG_ARCH_OMAP16XX
812
813 #include <linux/platform_device.h>
814
815 static int omap_mpuio_suspend_noirq(struct device *dev)
816 {
817 struct platform_device *pdev = to_platform_device(dev);
818 struct gpio_bank *bank = platform_get_drvdata(pdev);
819 void __iomem *mask_reg = bank->base +
820 OMAP_MPUIO_GPIO_MASKIT / bank->stride;
821 unsigned long flags;
822
823 spin_lock_irqsave(&bank->lock, flags);
824 bank->saved_wakeup = __raw_readl(mask_reg);
825 __raw_writel(0xffff & ~bank->suspend_wakeup, mask_reg);
826 spin_unlock_irqrestore(&bank->lock, flags);
827
828 return 0;
829 }
830
831 static int omap_mpuio_resume_noirq(struct device *dev)
832 {
833 struct platform_device *pdev = to_platform_device(dev);
834 struct gpio_bank *bank = platform_get_drvdata(pdev);
835 void __iomem *mask_reg = bank->base +
836 OMAP_MPUIO_GPIO_MASKIT / bank->stride;
837 unsigned long flags;
838
839 spin_lock_irqsave(&bank->lock, flags);
840 __raw_writel(bank->saved_wakeup, mask_reg);
841 spin_unlock_irqrestore(&bank->lock, flags);
842
843 return 0;
844 }
845
846 static const struct dev_pm_ops omap_mpuio_dev_pm_ops = {
847 .suspend_noirq = omap_mpuio_suspend_noirq,
848 .resume_noirq = omap_mpuio_resume_noirq,
849 };
850
851 /* use platform_driver for this. */
852 static struct platform_driver omap_mpuio_driver = {
853 .driver = {
854 .name = "mpuio",
855 .pm = &omap_mpuio_dev_pm_ops,
856 },
857 };
858
859 static struct platform_device omap_mpuio_device = {
860 .name = "mpuio",
861 .id = -1,
862 .dev = {
863 .driver = &omap_mpuio_driver.driver,
864 }
865 /* could list the /proc/iomem resources */
866 };
867
868 static inline void mpuio_init(void)
869 {
870 struct gpio_bank *bank = &gpio_bank[0];
871 platform_set_drvdata(&omap_mpuio_device, bank);
872
873 if (platform_driver_register(&omap_mpuio_driver) == 0)
874 (void) platform_device_register(&omap_mpuio_device);
875 }
876
877 #else
878 static inline void mpuio_init(void) {}
879 #endif /* 16xx */
880
881 #else
882
883 #define bank_is_mpuio(bank) 0
884 static inline void mpuio_init(void) {}
885
886 #endif
887
888 /*---------------------------------------------------------------------*/
889
890 /* REVISIT these are stupid implementations! replace by ones that
891 * don't switch on METHOD_* and which mostly avoid spinlocks
892 */
893
894 static int gpio_input(struct gpio_chip *chip, unsigned offset)
895 {
896 struct gpio_bank *bank;
897 unsigned long flags;
898
899 bank = container_of(chip, struct gpio_bank, chip);
900 spin_lock_irqsave(&bank->lock, flags);
901 _set_gpio_direction(bank, offset, 1);
902 spin_unlock_irqrestore(&bank->lock, flags);
903 return 0;
904 }
905
906 static int gpio_is_input(struct gpio_bank *bank, int mask)
907 {
908 void __iomem *reg = bank->base + bank->regs->direction;
909
910 return __raw_readl(reg) & mask;
911 }
912
913 static int gpio_get(struct gpio_chip *chip, unsigned offset)
914 {
915 struct gpio_bank *bank;
916 void __iomem *reg;
917 int gpio;
918 u32 mask;
919
920 gpio = chip->base + offset;
921 bank = container_of(chip, struct gpio_bank, chip);
922 reg = bank->base;
923 mask = GPIO_BIT(bank, gpio);
924
925 if (gpio_is_input(bank, mask))
926 return _get_gpio_datain(bank, gpio);
927 else
928 return _get_gpio_dataout(bank, gpio);
929 }
930
931 static int gpio_output(struct gpio_chip *chip, unsigned offset, int value)
932 {
933 struct gpio_bank *bank;
934 unsigned long flags;
935
936 bank = container_of(chip, struct gpio_bank, chip);
937 spin_lock_irqsave(&bank->lock, flags);
938 bank->set_dataout(bank, offset, value);
939 _set_gpio_direction(bank, offset, 0);
940 spin_unlock_irqrestore(&bank->lock, flags);
941 return 0;
942 }
943
944 static int gpio_debounce(struct gpio_chip *chip, unsigned offset,
945 unsigned debounce)
946 {
947 struct gpio_bank *bank;
948 unsigned long flags;
949
950 bank = container_of(chip, struct gpio_bank, chip);
951
952 if (!bank->dbck) {
953 bank->dbck = clk_get(bank->dev, "dbclk");
954 if (IS_ERR(bank->dbck))
955 dev_err(bank->dev, "Could not get gpio dbck\n");
956 }
957
958 spin_lock_irqsave(&bank->lock, flags);
959 _set_gpio_debounce(bank, offset, debounce);
960 spin_unlock_irqrestore(&bank->lock, flags);
961
962 return 0;
963 }
964
965 static void gpio_set(struct gpio_chip *chip, unsigned offset, int value)
966 {
967 struct gpio_bank *bank;
968 unsigned long flags;
969
970 bank = container_of(chip, struct gpio_bank, chip);
971 spin_lock_irqsave(&bank->lock, flags);
972 bank->set_dataout(bank, offset, value);
973 spin_unlock_irqrestore(&bank->lock, flags);
974 }
975
976 static int gpio_2irq(struct gpio_chip *chip, unsigned offset)
977 {
978 struct gpio_bank *bank;
979
980 bank = container_of(chip, struct gpio_bank, chip);
981 return bank->virtual_irq_start + offset;
982 }
983
984 /*---------------------------------------------------------------------*/
985
986 static void __init omap_gpio_show_rev(struct gpio_bank *bank)
987 {
988 static bool called;
989 u32 rev;
990
991 if (called || bank->regs->revision == USHRT_MAX)
992 return;
993
994 rev = __raw_readw(bank->base + bank->regs->revision);
995 pr_info("OMAP GPIO hardware version %d.%d\n",
996 (rev >> 4) & 0x0f, rev & 0x0f);
997
998 called = true;
999 }
1000
1001 /* This lock class tells lockdep that GPIO irqs are in a different
1002 * category than their parents, so it won't report false recursion.
1003 */
1004 static struct lock_class_key gpio_lock_class;
1005
1006 static inline int init_gpio_info(struct platform_device *pdev)
1007 {
1008 /* TODO: Analyze removing gpio_bank_count usage from driver code */
1009 gpio_bank = kzalloc(gpio_bank_count * sizeof(struct gpio_bank),
1010 GFP_KERNEL);
1011 if (!gpio_bank) {
1012 dev_err(&pdev->dev, "Memory alloc failed for gpio_bank\n");
1013 return -ENOMEM;
1014 }
1015 return 0;
1016 }
1017
1018 /* TODO: Cleanup cpu_is_* checks */
1019 static void omap_gpio_mod_init(struct gpio_bank *bank, int id)
1020 {
1021 if (cpu_class_is_omap2()) {
1022 if (cpu_is_omap44xx()) {
1023 __raw_writel(0xffffffff, bank->base +
1024 OMAP4_GPIO_IRQSTATUSCLR0);
1025 __raw_writel(0x00000000, bank->base +
1026 OMAP4_GPIO_DEBOUNCENABLE);
1027 /* Initialize interface clk ungated, module enabled */
1028 __raw_writel(0, bank->base + OMAP4_GPIO_CTRL);
1029 } else if (cpu_is_omap34xx()) {
1030 __raw_writel(0x00000000, bank->base +
1031 OMAP24XX_GPIO_IRQENABLE1);
1032 __raw_writel(0xffffffff, bank->base +
1033 OMAP24XX_GPIO_IRQSTATUS1);
1034 __raw_writel(0x00000000, bank->base +
1035 OMAP24XX_GPIO_DEBOUNCE_EN);
1036
1037 /* Initialize interface clk ungated, module enabled */
1038 __raw_writel(0, bank->base + OMAP24XX_GPIO_CTRL);
1039 } else if (cpu_is_omap24xx()) {
1040 static const u32 non_wakeup_gpios[] = {
1041 0xe203ffc0, 0x08700040
1042 };
1043 if (id < ARRAY_SIZE(non_wakeup_gpios))
1044 bank->non_wakeup_gpios = non_wakeup_gpios[id];
1045 }
1046 } else if (cpu_class_is_omap1()) {
1047 if (bank_is_mpuio(bank))
1048 __raw_writew(0xffff, bank->base +
1049 OMAP_MPUIO_GPIO_MASKIT / bank->stride);
1050 if (cpu_is_omap15xx() && bank->method == METHOD_GPIO_1510) {
1051 __raw_writew(0xffff, bank->base
1052 + OMAP1510_GPIO_INT_MASK);
1053 __raw_writew(0x0000, bank->base
1054 + OMAP1510_GPIO_INT_STATUS);
1055 }
1056 if (cpu_is_omap16xx() && bank->method == METHOD_GPIO_1610) {
1057 __raw_writew(0x0000, bank->base
1058 + OMAP1610_GPIO_IRQENABLE1);
1059 __raw_writew(0xffff, bank->base
1060 + OMAP1610_GPIO_IRQSTATUS1);
1061 __raw_writew(0x0014, bank->base
1062 + OMAP1610_GPIO_SYSCONFIG);
1063
1064 /*
1065 * Enable system clock for GPIO module.
1066 * The CAM_CLK_CTRL *is* really the right place.
1067 */
1068 omap_writel(omap_readl(ULPD_CAM_CLK_CTRL) | 0x04,
1069 ULPD_CAM_CLK_CTRL);
1070 }
1071 if (cpu_is_omap7xx() && bank->method == METHOD_GPIO_7XX) {
1072 __raw_writel(0xffffffff, bank->base
1073 + OMAP7XX_GPIO_INT_MASK);
1074 __raw_writel(0x00000000, bank->base
1075 + OMAP7XX_GPIO_INT_STATUS);
1076 }
1077 }
1078 }
1079
1080 static __init void
1081 omap_mpuio_alloc_gc(struct gpio_bank *bank, unsigned int irq_start,
1082 unsigned int num)
1083 {
1084 struct irq_chip_generic *gc;
1085 struct irq_chip_type *ct;
1086
1087 gc = irq_alloc_generic_chip("MPUIO", 1, irq_start, bank->base,
1088 handle_simple_irq);
1089 ct = gc->chip_types;
1090
1091 /* NOTE: No ack required, reading IRQ status clears it. */
1092 ct->chip.irq_mask = irq_gc_mask_set_bit;
1093 ct->chip.irq_unmask = irq_gc_mask_clr_bit;
1094 ct->chip.irq_set_type = gpio_irq_type;
1095 /* REVISIT: assuming only 16xx supports MPUIO wake events */
1096 if (cpu_is_omap16xx())
1097 ct->chip.irq_set_wake = gpio_wake_enable,
1098
1099 ct->regs.mask = OMAP_MPUIO_GPIO_INT / bank->stride;
1100 irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE,
1101 IRQ_NOREQUEST | IRQ_NOPROBE, 0);
1102 }
1103
1104 static void __devinit omap_gpio_chip_init(struct gpio_bank *bank)
1105 {
1106 int j;
1107 static int gpio;
1108
1109 bank->mod_usage = 0;
1110 /*
1111 * REVISIT eventually switch from OMAP-specific gpio structs
1112 * over to the generic ones
1113 */
1114 bank->chip.request = omap_gpio_request;
1115 bank->chip.free = omap_gpio_free;
1116 bank->chip.direction_input = gpio_input;
1117 bank->chip.get = gpio_get;
1118 bank->chip.direction_output = gpio_output;
1119 bank->chip.set_debounce = gpio_debounce;
1120 bank->chip.set = gpio_set;
1121 bank->chip.to_irq = gpio_2irq;
1122 if (bank_is_mpuio(bank)) {
1123 bank->chip.label = "mpuio";
1124 #ifdef CONFIG_ARCH_OMAP16XX
1125 bank->chip.dev = &omap_mpuio_device.dev;
1126 #endif
1127 bank->chip.base = OMAP_MPUIO(0);
1128 } else {
1129 bank->chip.label = "gpio";
1130 bank->chip.base = gpio;
1131 gpio += bank->width;
1132 }
1133 bank->chip.ngpio = bank->width;
1134
1135 gpiochip_add(&bank->chip);
1136
1137 for (j = bank->virtual_irq_start;
1138 j < bank->virtual_irq_start + bank->width; j++) {
1139 irq_set_lockdep_class(j, &gpio_lock_class);
1140 irq_set_chip_data(j, bank);
1141 if (bank_is_mpuio(bank)) {
1142 omap_mpuio_alloc_gc(bank, j, bank->width);
1143 } else {
1144 irq_set_chip(j, &gpio_irq_chip);
1145 irq_set_handler(j, handle_simple_irq);
1146 set_irq_flags(j, IRQF_VALID);
1147 }
1148 }
1149 irq_set_chained_handler(bank->irq, gpio_irq_handler);
1150 irq_set_handler_data(bank->irq, bank);
1151 }
1152
1153 static int __devinit omap_gpio_probe(struct platform_device *pdev)
1154 {
1155 static int gpio_init_done;
1156 struct omap_gpio_platform_data *pdata;
1157 struct resource *res;
1158 int id;
1159 struct gpio_bank *bank;
1160
1161 if (!pdev->dev.platform_data)
1162 return -EINVAL;
1163
1164 pdata = pdev->dev.platform_data;
1165
1166 if (!gpio_init_done) {
1167 int ret;
1168
1169 ret = init_gpio_info(pdev);
1170 if (ret)
1171 return ret;
1172 }
1173
1174 id = pdev->id;
1175 bank = &gpio_bank[id];
1176
1177 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1178 if (unlikely(!res)) {
1179 dev_err(&pdev->dev, "GPIO Bank %i Invalid IRQ resource\n", id);
1180 return -ENODEV;
1181 }
1182
1183 bank->irq = res->start;
1184 bank->virtual_irq_start = pdata->virtual_irq_start;
1185 bank->method = pdata->bank_type;
1186 bank->dev = &pdev->dev;
1187 bank->dbck_flag = pdata->dbck_flag;
1188 bank->stride = pdata->bank_stride;
1189 bank->width = pdata->bank_width;
1190
1191 bank->regs = pdata->regs;
1192
1193 if (bank->regs->set_dataout && bank->regs->clr_dataout)
1194 bank->set_dataout = _set_gpio_dataout_reg;
1195 else
1196 bank->set_dataout = _set_gpio_dataout_mask;
1197
1198 spin_lock_init(&bank->lock);
1199
1200 /* Static mapping, never released */
1201 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1202 if (unlikely(!res)) {
1203 dev_err(&pdev->dev, "GPIO Bank %i Invalid mem resource\n", id);
1204 return -ENODEV;
1205 }
1206
1207 bank->base = ioremap(res->start, resource_size(res));
1208 if (!bank->base) {
1209 dev_err(&pdev->dev, "Could not ioremap gpio bank%i\n", id);
1210 return -ENOMEM;
1211 }
1212
1213 pm_runtime_enable(bank->dev);
1214 pm_runtime_get_sync(bank->dev);
1215
1216 omap_gpio_mod_init(bank, id);
1217 omap_gpio_chip_init(bank);
1218 omap_gpio_show_rev(bank);
1219
1220 if (!gpio_init_done)
1221 gpio_init_done = 1;
1222
1223 return 0;
1224 }
1225
1226 #if defined(CONFIG_ARCH_OMAP16XX) || defined(CONFIG_ARCH_OMAP2PLUS)
1227 static int omap_gpio_suspend(void)
1228 {
1229 int i;
1230
1231 if (!cpu_class_is_omap2() && !cpu_is_omap16xx())
1232 return 0;
1233
1234 for (i = 0; i < gpio_bank_count; i++) {
1235 struct gpio_bank *bank = &gpio_bank[i];
1236 void __iomem *wake_status;
1237 void __iomem *wake_clear;
1238 void __iomem *wake_set;
1239 unsigned long flags;
1240
1241 switch (bank->method) {
1242 #ifdef CONFIG_ARCH_OMAP16XX
1243 case METHOD_GPIO_1610:
1244 wake_status = bank->base + OMAP1610_GPIO_WAKEUPENABLE;
1245 wake_clear = bank->base + OMAP1610_GPIO_CLEAR_WAKEUPENA;
1246 wake_set = bank->base + OMAP1610_GPIO_SET_WAKEUPENA;
1247 break;
1248 #endif
1249 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
1250 case METHOD_GPIO_24XX:
1251 wake_status = bank->base + OMAP24XX_GPIO_WAKE_EN;
1252 wake_clear = bank->base + OMAP24XX_GPIO_CLEARWKUENA;
1253 wake_set = bank->base + OMAP24XX_GPIO_SETWKUENA;
1254 break;
1255 #endif
1256 #ifdef CONFIG_ARCH_OMAP4
1257 case METHOD_GPIO_44XX:
1258 wake_status = bank->base + OMAP4_GPIO_IRQWAKEN0;
1259 wake_clear = bank->base + OMAP4_GPIO_IRQWAKEN0;
1260 wake_set = bank->base + OMAP4_GPIO_IRQWAKEN0;
1261 break;
1262 #endif
1263 default:
1264 continue;
1265 }
1266
1267 spin_lock_irqsave(&bank->lock, flags);
1268 bank->saved_wakeup = __raw_readl(wake_status);
1269 __raw_writel(0xffffffff, wake_clear);
1270 __raw_writel(bank->suspend_wakeup, wake_set);
1271 spin_unlock_irqrestore(&bank->lock, flags);
1272 }
1273
1274 return 0;
1275 }
1276
1277 static void omap_gpio_resume(void)
1278 {
1279 int i;
1280
1281 if (!cpu_class_is_omap2() && !cpu_is_omap16xx())
1282 return;
1283
1284 for (i = 0; i < gpio_bank_count; i++) {
1285 struct gpio_bank *bank = &gpio_bank[i];
1286 void __iomem *wake_clear;
1287 void __iomem *wake_set;
1288 unsigned long flags;
1289
1290 switch (bank->method) {
1291 #ifdef CONFIG_ARCH_OMAP16XX
1292 case METHOD_GPIO_1610:
1293 wake_clear = bank->base + OMAP1610_GPIO_CLEAR_WAKEUPENA;
1294 wake_set = bank->base + OMAP1610_GPIO_SET_WAKEUPENA;
1295 break;
1296 #endif
1297 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
1298 case METHOD_GPIO_24XX:
1299 wake_clear = bank->base + OMAP24XX_GPIO_CLEARWKUENA;
1300 wake_set = bank->base + OMAP24XX_GPIO_SETWKUENA;
1301 break;
1302 #endif
1303 #ifdef CONFIG_ARCH_OMAP4
1304 case METHOD_GPIO_44XX:
1305 wake_clear = bank->base + OMAP4_GPIO_IRQWAKEN0;
1306 wake_set = bank->base + OMAP4_GPIO_IRQWAKEN0;
1307 break;
1308 #endif
1309 default:
1310 continue;
1311 }
1312
1313 spin_lock_irqsave(&bank->lock, flags);
1314 __raw_writel(0xffffffff, wake_clear);
1315 __raw_writel(bank->saved_wakeup, wake_set);
1316 spin_unlock_irqrestore(&bank->lock, flags);
1317 }
1318 }
1319
1320 static struct syscore_ops omap_gpio_syscore_ops = {
1321 .suspend = omap_gpio_suspend,
1322 .resume = omap_gpio_resume,
1323 };
1324
1325 #endif
1326
1327 #ifdef CONFIG_ARCH_OMAP2PLUS
1328
1329 static int workaround_enabled;
1330
1331 void omap2_gpio_prepare_for_idle(int off_mode)
1332 {
1333 int i, c = 0;
1334 int min = 0;
1335
1336 if (cpu_is_omap34xx())
1337 min = 1;
1338
1339 for (i = min; i < gpio_bank_count; i++) {
1340 struct gpio_bank *bank = &gpio_bank[i];
1341 u32 l1 = 0, l2 = 0;
1342 int j;
1343
1344 for (j = 0; j < hweight_long(bank->dbck_enable_mask); j++)
1345 clk_disable(bank->dbck);
1346
1347 if (!off_mode)
1348 continue;
1349
1350 /* If going to OFF, remove triggering for all
1351 * non-wakeup GPIOs. Otherwise spurious IRQs will be
1352 * generated. See OMAP2420 Errata item 1.101. */
1353 if (!(bank->enabled_non_wakeup_gpios))
1354 continue;
1355
1356 if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
1357 bank->saved_datain = __raw_readl(bank->base +
1358 OMAP24XX_GPIO_DATAIN);
1359 l1 = __raw_readl(bank->base +
1360 OMAP24XX_GPIO_FALLINGDETECT);
1361 l2 = __raw_readl(bank->base +
1362 OMAP24XX_GPIO_RISINGDETECT);
1363 }
1364
1365 if (cpu_is_omap44xx()) {
1366 bank->saved_datain = __raw_readl(bank->base +
1367 OMAP4_GPIO_DATAIN);
1368 l1 = __raw_readl(bank->base +
1369 OMAP4_GPIO_FALLINGDETECT);
1370 l2 = __raw_readl(bank->base +
1371 OMAP4_GPIO_RISINGDETECT);
1372 }
1373
1374 bank->saved_fallingdetect = l1;
1375 bank->saved_risingdetect = l2;
1376 l1 &= ~bank->enabled_non_wakeup_gpios;
1377 l2 &= ~bank->enabled_non_wakeup_gpios;
1378
1379 if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
1380 __raw_writel(l1, bank->base +
1381 OMAP24XX_GPIO_FALLINGDETECT);
1382 __raw_writel(l2, bank->base +
1383 OMAP24XX_GPIO_RISINGDETECT);
1384 }
1385
1386 if (cpu_is_omap44xx()) {
1387 __raw_writel(l1, bank->base + OMAP4_GPIO_FALLINGDETECT);
1388 __raw_writel(l2, bank->base + OMAP4_GPIO_RISINGDETECT);
1389 }
1390
1391 c++;
1392 }
1393 if (!c) {
1394 workaround_enabled = 0;
1395 return;
1396 }
1397 workaround_enabled = 1;
1398 }
1399
1400 void omap2_gpio_resume_after_idle(void)
1401 {
1402 int i;
1403 int min = 0;
1404
1405 if (cpu_is_omap34xx())
1406 min = 1;
1407 for (i = min; i < gpio_bank_count; i++) {
1408 struct gpio_bank *bank = &gpio_bank[i];
1409 u32 l = 0, gen, gen0, gen1;
1410 int j;
1411
1412 for (j = 0; j < hweight_long(bank->dbck_enable_mask); j++)
1413 clk_enable(bank->dbck);
1414
1415 if (!workaround_enabled)
1416 continue;
1417
1418 if (!(bank->enabled_non_wakeup_gpios))
1419 continue;
1420
1421 if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
1422 __raw_writel(bank->saved_fallingdetect,
1423 bank->base + OMAP24XX_GPIO_FALLINGDETECT);
1424 __raw_writel(bank->saved_risingdetect,
1425 bank->base + OMAP24XX_GPIO_RISINGDETECT);
1426 l = __raw_readl(bank->base + OMAP24XX_GPIO_DATAIN);
1427 }
1428
1429 if (cpu_is_omap44xx()) {
1430 __raw_writel(bank->saved_fallingdetect,
1431 bank->base + OMAP4_GPIO_FALLINGDETECT);
1432 __raw_writel(bank->saved_risingdetect,
1433 bank->base + OMAP4_GPIO_RISINGDETECT);
1434 l = __raw_readl(bank->base + OMAP4_GPIO_DATAIN);
1435 }
1436
1437 /* Check if any of the non-wakeup interrupt GPIOs have changed
1438 * state. If so, generate an IRQ by software. This is
1439 * horribly racy, but it's the best we can do to work around
1440 * this silicon bug. */
1441 l ^= bank->saved_datain;
1442 l &= bank->enabled_non_wakeup_gpios;
1443
1444 /*
1445 * No need to generate IRQs for the rising edge for gpio IRQs
1446 * configured with falling edge only; and vice versa.
1447 */
1448 gen0 = l & bank->saved_fallingdetect;
1449 gen0 &= bank->saved_datain;
1450
1451 gen1 = l & bank->saved_risingdetect;
1452 gen1 &= ~(bank->saved_datain);
1453
1454 /* FIXME: Consider GPIO IRQs with level detections properly! */
1455 gen = l & (~(bank->saved_fallingdetect) &
1456 ~(bank->saved_risingdetect));
1457 /* Consider all GPIO IRQs needed to be updated */
1458 gen |= gen0 | gen1;
1459
1460 if (gen) {
1461 u32 old0, old1;
1462
1463 if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
1464 old0 = __raw_readl(bank->base +
1465 OMAP24XX_GPIO_LEVELDETECT0);
1466 old1 = __raw_readl(bank->base +
1467 OMAP24XX_GPIO_LEVELDETECT1);
1468 __raw_writel(old0 | gen, bank->base +
1469 OMAP24XX_GPIO_LEVELDETECT0);
1470 __raw_writel(old1 | gen, bank->base +
1471 OMAP24XX_GPIO_LEVELDETECT1);
1472 __raw_writel(old0, bank->base +
1473 OMAP24XX_GPIO_LEVELDETECT0);
1474 __raw_writel(old1, bank->base +
1475 OMAP24XX_GPIO_LEVELDETECT1);
1476 }
1477
1478 if (cpu_is_omap44xx()) {
1479 old0 = __raw_readl(bank->base +
1480 OMAP4_GPIO_LEVELDETECT0);
1481 old1 = __raw_readl(bank->base +
1482 OMAP4_GPIO_LEVELDETECT1);
1483 __raw_writel(old0 | l, bank->base +
1484 OMAP4_GPIO_LEVELDETECT0);
1485 __raw_writel(old1 | l, bank->base +
1486 OMAP4_GPIO_LEVELDETECT1);
1487 __raw_writel(old0, bank->base +
1488 OMAP4_GPIO_LEVELDETECT0);
1489 __raw_writel(old1, bank->base +
1490 OMAP4_GPIO_LEVELDETECT1);
1491 }
1492 }
1493 }
1494
1495 }
1496
1497 #endif
1498
1499 #ifdef CONFIG_ARCH_OMAP3
1500 /* save the registers of bank 2-6 */
1501 void omap_gpio_save_context(void)
1502 {
1503 int i;
1504
1505 /* saving banks from 2-6 only since GPIO1 is in WKUP */
1506 for (i = 1; i < gpio_bank_count; i++) {
1507 struct gpio_bank *bank = &gpio_bank[i];
1508 gpio_context[i].irqenable1 =
1509 __raw_readl(bank->base + OMAP24XX_GPIO_IRQENABLE1);
1510 gpio_context[i].irqenable2 =
1511 __raw_readl(bank->base + OMAP24XX_GPIO_IRQENABLE2);
1512 gpio_context[i].wake_en =
1513 __raw_readl(bank->base + OMAP24XX_GPIO_WAKE_EN);
1514 gpio_context[i].ctrl =
1515 __raw_readl(bank->base + OMAP24XX_GPIO_CTRL);
1516 gpio_context[i].oe =
1517 __raw_readl(bank->base + OMAP24XX_GPIO_OE);
1518 gpio_context[i].leveldetect0 =
1519 __raw_readl(bank->base + OMAP24XX_GPIO_LEVELDETECT0);
1520 gpio_context[i].leveldetect1 =
1521 __raw_readl(bank->base + OMAP24XX_GPIO_LEVELDETECT1);
1522 gpio_context[i].risingdetect =
1523 __raw_readl(bank->base + OMAP24XX_GPIO_RISINGDETECT);
1524 gpio_context[i].fallingdetect =
1525 __raw_readl(bank->base + OMAP24XX_GPIO_FALLINGDETECT);
1526 gpio_context[i].dataout =
1527 __raw_readl(bank->base + OMAP24XX_GPIO_DATAOUT);
1528 }
1529 }
1530
1531 /* restore the required registers of bank 2-6 */
1532 void omap_gpio_restore_context(void)
1533 {
1534 int i;
1535
1536 for (i = 1; i < gpio_bank_count; i++) {
1537 struct gpio_bank *bank = &gpio_bank[i];
1538 __raw_writel(gpio_context[i].irqenable1,
1539 bank->base + OMAP24XX_GPIO_IRQENABLE1);
1540 __raw_writel(gpio_context[i].irqenable2,
1541 bank->base + OMAP24XX_GPIO_IRQENABLE2);
1542 __raw_writel(gpio_context[i].wake_en,
1543 bank->base + OMAP24XX_GPIO_WAKE_EN);
1544 __raw_writel(gpio_context[i].ctrl,
1545 bank->base + OMAP24XX_GPIO_CTRL);
1546 __raw_writel(gpio_context[i].oe,
1547 bank->base + OMAP24XX_GPIO_OE);
1548 __raw_writel(gpio_context[i].leveldetect0,
1549 bank->base + OMAP24XX_GPIO_LEVELDETECT0);
1550 __raw_writel(gpio_context[i].leveldetect1,
1551 bank->base + OMAP24XX_GPIO_LEVELDETECT1);
1552 __raw_writel(gpio_context[i].risingdetect,
1553 bank->base + OMAP24XX_GPIO_RISINGDETECT);
1554 __raw_writel(gpio_context[i].fallingdetect,
1555 bank->base + OMAP24XX_GPIO_FALLINGDETECT);
1556 __raw_writel(gpio_context[i].dataout,
1557 bank->base + OMAP24XX_GPIO_DATAOUT);
1558 }
1559 }
1560 #endif
1561
1562 static struct platform_driver omap_gpio_driver = {
1563 .probe = omap_gpio_probe,
1564 .driver = {
1565 .name = "omap_gpio",
1566 },
1567 };
1568
1569 /*
1570 * gpio driver register needs to be done before
1571 * machine_init functions access gpio APIs.
1572 * Hence omap_gpio_drv_reg() is a postcore_initcall.
1573 */
1574 static int __init omap_gpio_drv_reg(void)
1575 {
1576 return platform_driver_register(&omap_gpio_driver);
1577 }
1578 postcore_initcall(omap_gpio_drv_reg);
1579
1580 static int __init omap_gpio_sysinit(void)
1581 {
1582 mpuio_init();
1583
1584 #if defined(CONFIG_ARCH_OMAP16XX) || defined(CONFIG_ARCH_OMAP2PLUS)
1585 if (cpu_is_omap16xx() || cpu_class_is_omap2())
1586 register_syscore_ops(&omap_gpio_syscore_ops);
1587 #endif
1588
1589 return 0;
1590 }
1591
1592 arch_initcall(omap_gpio_sysinit);
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