1 /*
2 * linux/arch/arm/mach-at91/gpio.c
3 *
4 * Copyright (C) 2005 HP Labs
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 */
11
12 #include <linux/clk.h>
13 #include <linux/errno.h>
14 #include <linux/device.h>
15 #include <linux/gpio.h>
16 #include <linux/interrupt.h>
17 #include <linux/irq.h>
18 #include <linux/debugfs.h>
19 #include <linux/seq_file.h>
20 #include <linux/kernel.h>
21 #include <linux/list.h>
22 #include <linux/module.h>
23 #include <linux/io.h>
24 #include <linux/irqdomain.h>
25 #include <linux/of_address.h>
26 #include <linux/of_irq.h>
27 #include <linux/of_gpio.h>
28
29 #include <mach/hardware.h>
30 #include <mach/at91_pio.h>
31
32 #include "generic.h"
33
34 struct at91_gpio_chip {
35 struct gpio_chip chip;
36 struct at91_gpio_chip *next; /* Bank sharing same clock */
37 int pioc_hwirq; /* PIO bank interrupt identifier on AIC */
38 int pioc_virq; /* PIO bank Linux virtual interrupt */
39 int pioc_idx; /* PIO bank index */
40 void __iomem *regbase; /* PIO bank virtual address */
41 struct clk *clock; /* associated clock */
42 struct irq_domain *domain; /* associated irq domain */
43 };
44
45 #define to_at91_gpio_chip(c) container_of(c, struct at91_gpio_chip, chip)
46
47 static void at91_gpiolib_dbg_show(struct seq_file *s, struct gpio_chip *chip);
48 static void at91_gpiolib_set(struct gpio_chip *chip, unsigned offset, int val);
49 static int at91_gpiolib_get(struct gpio_chip *chip, unsigned offset);
50 static int at91_gpiolib_direction_output(struct gpio_chip *chip,
51 unsigned offset, int val);
52 static int at91_gpiolib_direction_input(struct gpio_chip *chip,
53 unsigned offset);
54 static int at91_gpiolib_to_irq(struct gpio_chip *chip, unsigned offset);
55
56 #define AT91_GPIO_CHIP(name, nr_gpio) \
57 { \
58 .chip = { \
59 .label = name, \
60 .direction_input = at91_gpiolib_direction_input, \
61 .direction_output = at91_gpiolib_direction_output, \
62 .get = at91_gpiolib_get, \
63 .set = at91_gpiolib_set, \
64 .dbg_show = at91_gpiolib_dbg_show, \
65 .to_irq = at91_gpiolib_to_irq, \
66 .ngpio = nr_gpio, \
67 }, \
68 }
69
70 static struct at91_gpio_chip gpio_chip[] = {
71 AT91_GPIO_CHIP("pioA", 32),
72 AT91_GPIO_CHIP("pioB", 32),
73 AT91_GPIO_CHIP("pioC", 32),
74 AT91_GPIO_CHIP("pioD", 32),
75 AT91_GPIO_CHIP("pioE", 32),
76 };
77
78 static int gpio_banks;
79 static unsigned long at91_gpio_caps;
80
81 /* All PIO controllers support PIO3 features */
82 #define AT91_GPIO_CAP_PIO3 (1 << 0)
83
84 #define has_pio3() (at91_gpio_caps & AT91_GPIO_CAP_PIO3)
85
86 /*--------------------------------------------------------------------------*/
87
pin_to_controller(unsigned pin)88 static inline void __iomem *pin_to_controller(unsigned pin)
89 {
90 pin /= 32;
91 if (likely(pin < gpio_banks))
92 return gpio_chip[pin].regbase;
93
94 return NULL;
95 }
96
pin_to_mask(unsigned pin)97 static inline unsigned pin_to_mask(unsigned pin)
98 {
99 return 1 << (pin % 32);
100 }
101
102
peripheral_function(void __iomem * pio,unsigned mask)103 static char peripheral_function(void __iomem *pio, unsigned mask)
104 {
105 char ret = 'X';
106 u8 select;
107
108 if (pio) {
109 if (has_pio3()) {
110 select = !!(__raw_readl(pio + PIO_ABCDSR1) & mask);
111 select |= (!!(__raw_readl(pio + PIO_ABCDSR2) & mask) << 1);
112 ret = 'A' + select;
113 } else {
114 ret = __raw_readl(pio + PIO_ABSR) & mask ?
115 'B' : 'A';
116 }
117 }
118
119 return ret;
120 }
121
122 /*--------------------------------------------------------------------------*/
123
124 /* Not all hardware capabilities are exposed through these calls; they
125 * only encapsulate the most common features and modes. (So if you
126 * want to change signals in groups, do it directly.)
127 *
128 * Bootloaders will usually handle some of the pin multiplexing setup.
129 * The intent is certainly that by the time Linux is fully booted, all
130 * pins should have been fully initialized. These setup calls should
131 * only be used by board setup routines, or possibly in driver probe().
132 *
133 * For bootloaders doing all that setup, these calls could be inlined
134 * as NOPs so Linux won't duplicate any setup code
135 */
136
137
138 /*
139 * mux the pin to the "GPIO" peripheral role.
140 */
at91_set_GPIO_periph(unsigned pin,int use_pullup)141 int __init_or_module at91_set_GPIO_periph(unsigned pin, int use_pullup)
142 {
143 void __iomem *pio = pin_to_controller(pin);
144 unsigned mask = pin_to_mask(pin);
145
146 if (!pio)
147 return -EINVAL;
148 __raw_writel(mask, pio + PIO_IDR);
149 __raw_writel(mask, pio + (use_pullup ? PIO_PUER : PIO_PUDR));
150 __raw_writel(mask, pio + PIO_PER);
151 return 0;
152 }
153 EXPORT_SYMBOL(at91_set_GPIO_periph);
154
155
156 /*
157 * mux the pin to the "A" internal peripheral role.
158 */
at91_set_A_periph(unsigned pin,int use_pullup)159 int __init_or_module at91_set_A_periph(unsigned pin, int use_pullup)
160 {
161 void __iomem *pio = pin_to_controller(pin);
162 unsigned mask = pin_to_mask(pin);
163
164 if (!pio)
165 return -EINVAL;
166
167 __raw_writel(mask, pio + PIO_IDR);
168 __raw_writel(mask, pio + (use_pullup ? PIO_PUER : PIO_PUDR));
169 if (has_pio3()) {
170 __raw_writel(__raw_readl(pio + PIO_ABCDSR1) & ~mask,
171 pio + PIO_ABCDSR1);
172 __raw_writel(__raw_readl(pio + PIO_ABCDSR2) & ~mask,
173 pio + PIO_ABCDSR2);
174 } else {
175 __raw_writel(mask, pio + PIO_ASR);
176 }
177 __raw_writel(mask, pio + PIO_PDR);
178 return 0;
179 }
180 EXPORT_SYMBOL(at91_set_A_periph);
181
182
183 /*
184 * mux the pin to the "B" internal peripheral role.
185 */
at91_set_B_periph(unsigned pin,int use_pullup)186 int __init_or_module at91_set_B_periph(unsigned pin, int use_pullup)
187 {
188 void __iomem *pio = pin_to_controller(pin);
189 unsigned mask = pin_to_mask(pin);
190
191 if (!pio)
192 return -EINVAL;
193
194 __raw_writel(mask, pio + PIO_IDR);
195 __raw_writel(mask, pio + (use_pullup ? PIO_PUER : PIO_PUDR));
196 if (has_pio3()) {
197 __raw_writel(__raw_readl(pio + PIO_ABCDSR1) | mask,
198 pio + PIO_ABCDSR1);
199 __raw_writel(__raw_readl(pio + PIO_ABCDSR2) & ~mask,
200 pio + PIO_ABCDSR2);
201 } else {
202 __raw_writel(mask, pio + PIO_BSR);
203 }
204 __raw_writel(mask, pio + PIO_PDR);
205 return 0;
206 }
207 EXPORT_SYMBOL(at91_set_B_periph);
208
209
210 /*
211 * mux the pin to the "C" internal peripheral role.
212 */
at91_set_C_periph(unsigned pin,int use_pullup)213 int __init_or_module at91_set_C_periph(unsigned pin, int use_pullup)
214 {
215 void __iomem *pio = pin_to_controller(pin);
216 unsigned mask = pin_to_mask(pin);
217
218 if (!pio || !has_pio3())
219 return -EINVAL;
220
221 __raw_writel(mask, pio + PIO_IDR);
222 __raw_writel(mask, pio + (use_pullup ? PIO_PUER : PIO_PUDR));
223 __raw_writel(__raw_readl(pio + PIO_ABCDSR1) & ~mask, pio + PIO_ABCDSR1);
224 __raw_writel(__raw_readl(pio + PIO_ABCDSR2) | mask, pio + PIO_ABCDSR2);
225 __raw_writel(mask, pio + PIO_PDR);
226 return 0;
227 }
228 EXPORT_SYMBOL(at91_set_C_periph);
229
230
231 /*
232 * mux the pin to the "D" internal peripheral role.
233 */
at91_set_D_periph(unsigned pin,int use_pullup)234 int __init_or_module at91_set_D_periph(unsigned pin, int use_pullup)
235 {
236 void __iomem *pio = pin_to_controller(pin);
237 unsigned mask = pin_to_mask(pin);
238
239 if (!pio || !has_pio3())
240 return -EINVAL;
241
242 __raw_writel(mask, pio + PIO_IDR);
243 __raw_writel(mask, pio + (use_pullup ? PIO_PUER : PIO_PUDR));
244 __raw_writel(__raw_readl(pio + PIO_ABCDSR1) | mask, pio + PIO_ABCDSR1);
245 __raw_writel(__raw_readl(pio + PIO_ABCDSR2) | mask, pio + PIO_ABCDSR2);
246 __raw_writel(mask, pio + PIO_PDR);
247 return 0;
248 }
249 EXPORT_SYMBOL(at91_set_D_periph);
250
251
252 /*
253 * mux the pin to the gpio controller (instead of "A", "B", "C"
254 * or "D" peripheral), and configure it for an input.
255 */
at91_set_gpio_input(unsigned pin,int use_pullup)256 int __init_or_module at91_set_gpio_input(unsigned pin, int use_pullup)
257 {
258 void __iomem *pio = pin_to_controller(pin);
259 unsigned mask = pin_to_mask(pin);
260
261 if (!pio)
262 return -EINVAL;
263
264 __raw_writel(mask, pio + PIO_IDR);
265 __raw_writel(mask, pio + (use_pullup ? PIO_PUER : PIO_PUDR));
266 __raw_writel(mask, pio + PIO_ODR);
267 __raw_writel(mask, pio + PIO_PER);
268 return 0;
269 }
270 EXPORT_SYMBOL(at91_set_gpio_input);
271
272
273 /*
274 * mux the pin to the gpio controller (instead of "A", "B", "C"
275 * or "D" peripheral), and configure it for an output.
276 */
at91_set_gpio_output(unsigned pin,int value)277 int __init_or_module at91_set_gpio_output(unsigned pin, int value)
278 {
279 void __iomem *pio = pin_to_controller(pin);
280 unsigned mask = pin_to_mask(pin);
281
282 if (!pio)
283 return -EINVAL;
284
285 __raw_writel(mask, pio + PIO_IDR);
286 __raw_writel(mask, pio + PIO_PUDR);
287 __raw_writel(mask, pio + (value ? PIO_SODR : PIO_CODR));
288 __raw_writel(mask, pio + PIO_OER);
289 __raw_writel(mask, pio + PIO_PER);
290 return 0;
291 }
292 EXPORT_SYMBOL(at91_set_gpio_output);
293
294
295 /*
296 * enable/disable the glitch filter; mostly used with IRQ handling.
297 */
at91_set_deglitch(unsigned pin,int is_on)298 int __init_or_module at91_set_deglitch(unsigned pin, int is_on)
299 {
300 void __iomem *pio = pin_to_controller(pin);
301 unsigned mask = pin_to_mask(pin);
302
303 if (!pio)
304 return -EINVAL;
305
306 if (has_pio3() && is_on)
307 __raw_writel(mask, pio + PIO_IFSCDR);
308 __raw_writel(mask, pio + (is_on ? PIO_IFER : PIO_IFDR));
309 return 0;
310 }
311 EXPORT_SYMBOL(at91_set_deglitch);
312
313 /*
314 * enable/disable the debounce filter;
315 */
at91_set_debounce(unsigned pin,int is_on,int div)316 int __init_or_module at91_set_debounce(unsigned pin, int is_on, int div)
317 {
318 void __iomem *pio = pin_to_controller(pin);
319 unsigned mask = pin_to_mask(pin);
320
321 if (!pio || !has_pio3())
322 return -EINVAL;
323
324 if (is_on) {
325 __raw_writel(mask, pio + PIO_IFSCER);
326 __raw_writel(div & PIO_SCDR_DIV, pio + PIO_SCDR);
327 __raw_writel(mask, pio + PIO_IFER);
328 } else {
329 __raw_writel(mask, pio + PIO_IFDR);
330 }
331 return 0;
332 }
333 EXPORT_SYMBOL(at91_set_debounce);
334
335 /*
336 * enable/disable the multi-driver; This is only valid for output and
337 * allows the output pin to run as an open collector output.
338 */
at91_set_multi_drive(unsigned pin,int is_on)339 int __init_or_module at91_set_multi_drive(unsigned pin, int is_on)
340 {
341 void __iomem *pio = pin_to_controller(pin);
342 unsigned mask = pin_to_mask(pin);
343
344 if (!pio)
345 return -EINVAL;
346
347 __raw_writel(mask, pio + (is_on ? PIO_MDER : PIO_MDDR));
348 return 0;
349 }
350 EXPORT_SYMBOL(at91_set_multi_drive);
351
352 /*
353 * enable/disable the pull-down.
354 * If pull-up already enabled while calling the function, we disable it.
355 */
at91_set_pulldown(unsigned pin,int is_on)356 int __init_or_module at91_set_pulldown(unsigned pin, int is_on)
357 {
358 void __iomem *pio = pin_to_controller(pin);
359 unsigned mask = pin_to_mask(pin);
360
361 if (!pio || !has_pio3())
362 return -EINVAL;
363
364 /* Disable pull-up anyway */
365 __raw_writel(mask, pio + PIO_PUDR);
366 __raw_writel(mask, pio + (is_on ? PIO_PPDER : PIO_PPDDR));
367 return 0;
368 }
369 EXPORT_SYMBOL(at91_set_pulldown);
370
371 /*
372 * disable Schmitt trigger
373 */
at91_disable_schmitt_trig(unsigned pin)374 int __init_or_module at91_disable_schmitt_trig(unsigned pin)
375 {
376 void __iomem *pio = pin_to_controller(pin);
377 unsigned mask = pin_to_mask(pin);
378
379 if (!pio || !has_pio3())
380 return -EINVAL;
381
382 __raw_writel(__raw_readl(pio + PIO_SCHMITT) | mask, pio + PIO_SCHMITT);
383 return 0;
384 }
385 EXPORT_SYMBOL(at91_disable_schmitt_trig);
386
387 /*
388 * assuming the pin is muxed as a gpio output, set its value.
389 */
at91_set_gpio_value(unsigned pin,int value)390 int at91_set_gpio_value(unsigned pin, int value)
391 {
392 void __iomem *pio = pin_to_controller(pin);
393 unsigned mask = pin_to_mask(pin);
394
395 if (!pio)
396 return -EINVAL;
397 __raw_writel(mask, pio + (value ? PIO_SODR : PIO_CODR));
398 return 0;
399 }
400 EXPORT_SYMBOL(at91_set_gpio_value);
401
402
403 /*
404 * read the pin's value (works even if it's not muxed as a gpio).
405 */
at91_get_gpio_value(unsigned pin)406 int at91_get_gpio_value(unsigned pin)
407 {
408 void __iomem *pio = pin_to_controller(pin);
409 unsigned mask = pin_to_mask(pin);
410 u32 pdsr;
411
412 if (!pio)
413 return -EINVAL;
414 pdsr = __raw_readl(pio + PIO_PDSR);
415 return (pdsr & mask) != 0;
416 }
417 EXPORT_SYMBOL(at91_get_gpio_value);
418
419 /*--------------------------------------------------------------------------*/
420
421 #ifdef CONFIG_PM
422
423 static u32 wakeups[MAX_GPIO_BANKS];
424 static u32 backups[MAX_GPIO_BANKS];
425
gpio_irq_set_wake(struct irq_data * d,unsigned state)426 static int gpio_irq_set_wake(struct irq_data *d, unsigned state)
427 {
428 struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
429 unsigned mask = 1 << d->hwirq;
430 unsigned bank = at91_gpio->pioc_idx;
431
432 if (unlikely(bank >= MAX_GPIO_BANKS))
433 return -EINVAL;
434
435 if (state)
436 wakeups[bank] |= mask;
437 else
438 wakeups[bank] &= ~mask;
439
440 irq_set_irq_wake(at91_gpio->pioc_virq, state);
441
442 return 0;
443 }
444
at91_gpio_suspend(void)445 void at91_gpio_suspend(void)
446 {
447 int i;
448
449 for (i = 0; i < gpio_banks; i++) {
450 void __iomem *pio = gpio_chip[i].regbase;
451
452 backups[i] = __raw_readl(pio + PIO_IMR);
453 __raw_writel(backups[i], pio + PIO_IDR);
454 __raw_writel(wakeups[i], pio + PIO_IER);
455
456 if (!wakeups[i]) {
457 clk_unprepare(gpio_chip[i].clock);
458 clk_disable(gpio_chip[i].clock);
459 } else {
460 #ifdef CONFIG_PM_DEBUG
461 printk(KERN_DEBUG "GPIO-%c may wake for %08x\n", 'A'+i, wakeups[i]);
462 #endif
463 }
464 }
465 }
466
at91_gpio_resume(void)467 void at91_gpio_resume(void)
468 {
469 int i;
470
471 for (i = 0; i < gpio_banks; i++) {
472 void __iomem *pio = gpio_chip[i].regbase;
473
474 if (!wakeups[i]) {
475 if (clk_prepare(gpio_chip[i].clock) == 0)
476 clk_enable(gpio_chip[i].clock);
477 }
478
479 __raw_writel(wakeups[i], pio + PIO_IDR);
480 __raw_writel(backups[i], pio + PIO_IER);
481 }
482 }
483
484 #else
485 #define gpio_irq_set_wake NULL
486 #endif
487
488
489 /* Several AIC controller irqs are dispatched through this GPIO handler.
490 * To use any AT91_PIN_* as an externally triggered IRQ, first call
491 * at91_set_gpio_input() then maybe enable its glitch filter.
492 * Then just request_irq() with the pin ID; it works like any ARM IRQ
493 * handler.
494 * First implementation always triggers on rising and falling edges
495 * whereas the newer PIO3 can be additionally configured to trigger on
496 * level, edge with any polarity.
497 *
498 * Alternatively, certain pins may be used directly as IRQ0..IRQ6 after
499 * configuring them with at91_set_a_periph() or at91_set_b_periph().
500 * IRQ0..IRQ6 should be configurable, e.g. level vs edge triggering.
501 */
502
gpio_irq_mask(struct irq_data * d)503 static void gpio_irq_mask(struct irq_data *d)
504 {
505 struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
506 void __iomem *pio = at91_gpio->regbase;
507 unsigned mask = 1 << d->hwirq;
508
509 if (pio)
510 __raw_writel(mask, pio + PIO_IDR);
511 }
512
gpio_irq_unmask(struct irq_data * d)513 static void gpio_irq_unmask(struct irq_data *d)
514 {
515 struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
516 void __iomem *pio = at91_gpio->regbase;
517 unsigned mask = 1 << d->hwirq;
518
519 if (pio)
520 __raw_writel(mask, pio + PIO_IER);
521 }
522
gpio_irq_type(struct irq_data * d,unsigned type)523 static int gpio_irq_type(struct irq_data *d, unsigned type)
524 {
525 switch (type) {
526 case IRQ_TYPE_NONE:
527 case IRQ_TYPE_EDGE_BOTH:
528 return 0;
529 default:
530 return -EINVAL;
531 }
532 }
533
534 /* Alternate irq type for PIO3 support */
alt_gpio_irq_type(struct irq_data * d,unsigned type)535 static int alt_gpio_irq_type(struct irq_data *d, unsigned type)
536 {
537 struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
538 void __iomem *pio = at91_gpio->regbase;
539 unsigned mask = 1 << d->hwirq;
540
541 switch (type) {
542 case IRQ_TYPE_EDGE_RISING:
543 __raw_writel(mask, pio + PIO_ESR);
544 __raw_writel(mask, pio + PIO_REHLSR);
545 break;
546 case IRQ_TYPE_EDGE_FALLING:
547 __raw_writel(mask, pio + PIO_ESR);
548 __raw_writel(mask, pio + PIO_FELLSR);
549 break;
550 case IRQ_TYPE_LEVEL_LOW:
551 __raw_writel(mask, pio + PIO_LSR);
552 __raw_writel(mask, pio + PIO_FELLSR);
553 break;
554 case IRQ_TYPE_LEVEL_HIGH:
555 __raw_writel(mask, pio + PIO_LSR);
556 __raw_writel(mask, pio + PIO_REHLSR);
557 break;
558 case IRQ_TYPE_EDGE_BOTH:
559 /*
560 * disable additional interrupt modes:
561 * fall back to default behavior
562 */
563 __raw_writel(mask, pio + PIO_AIMDR);
564 return 0;
565 case IRQ_TYPE_NONE:
566 default:
567 pr_warn("AT91: No type for irq %d\n", gpio_to_irq(d->irq));
568 return -EINVAL;
569 }
570
571 /* enable additional interrupt modes */
572 __raw_writel(mask, pio + PIO_AIMER);
573
574 return 0;
575 }
576
577 static struct irq_chip gpio_irqchip = {
578 .name = "GPIO",
579 .irq_disable = gpio_irq_mask,
580 .irq_mask = gpio_irq_mask,
581 .irq_unmask = gpio_irq_unmask,
582 /* .irq_set_type is set dynamically */
583 .irq_set_wake = gpio_irq_set_wake,
584 };
585
gpio_irq_handler(unsigned irq,struct irq_desc * desc)586 static void gpio_irq_handler(unsigned irq, struct irq_desc *desc)
587 {
588 struct irq_data *idata = irq_desc_get_irq_data(desc);
589 struct irq_chip *chip = irq_data_get_irq_chip(idata);
590 struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(idata);
591 void __iomem *pio = at91_gpio->regbase;
592 unsigned long isr;
593 int n;
594
595 /* temporarily mask (level sensitive) parent IRQ */
596 chip->irq_ack(idata);
597 for (;;) {
598 /* Reading ISR acks pending (edge triggered) GPIO interrupts.
599 * When there none are pending, we're finished unless we need
600 * to process multiple banks (like ID_PIOCDE on sam9263).
601 */
602 isr = __raw_readl(pio + PIO_ISR) & __raw_readl(pio + PIO_IMR);
603 if (!isr) {
604 if (!at91_gpio->next)
605 break;
606 at91_gpio = at91_gpio->next;
607 pio = at91_gpio->regbase;
608 continue;
609 }
610
611 n = find_first_bit(&isr, BITS_PER_LONG);
612 while (n < BITS_PER_LONG) {
613 generic_handle_irq(irq_find_mapping(at91_gpio->domain, n));
614 n = find_next_bit(&isr, BITS_PER_LONG, n + 1);
615 }
616 }
617 chip->irq_unmask(idata);
618 /* now it may re-trigger */
619 }
620
621 /*--------------------------------------------------------------------------*/
622
623 #ifdef CONFIG_DEBUG_FS
624
gpio_printf(struct seq_file * s,void __iomem * pio,unsigned mask)625 static void gpio_printf(struct seq_file *s, void __iomem *pio, unsigned mask)
626 {
627 char *trigger = NULL;
628 char *polarity = NULL;
629
630 if (__raw_readl(pio + PIO_IMR) & mask) {
631 if (!has_pio3() || !(__raw_readl(pio + PIO_AIMMR) & mask )) {
632 trigger = "edge";
633 polarity = "both";
634 } else {
635 if (__raw_readl(pio + PIO_ELSR) & mask) {
636 trigger = "level";
637 polarity = __raw_readl(pio + PIO_FRLHSR) & mask ?
638 "high" : "low";
639 } else {
640 trigger = "edge";
641 polarity = __raw_readl(pio + PIO_FRLHSR) & mask ?
642 "rising" : "falling";
643 }
644 }
645 seq_printf(s, "IRQ:%s-%s\t", trigger, polarity);
646 } else {
647 seq_printf(s, "GPIO:%s\t\t",
648 __raw_readl(pio + PIO_PDSR) & mask ? "1" : "0");
649 }
650 }
651
at91_gpio_show(struct seq_file * s,void * unused)652 static int at91_gpio_show(struct seq_file *s, void *unused)
653 {
654 int bank, j;
655
656 /* print heading */
657 seq_printf(s, "Pin\t");
658 for (bank = 0; bank < gpio_banks; bank++) {
659 seq_printf(s, "PIO%c\t\t", 'A' + bank);
660 };
661 seq_printf(s, "\n\n");
662
663 /* print pin status */
664 for (j = 0; j < 32; j++) {
665 seq_printf(s, "%i:\t", j);
666
667 for (bank = 0; bank < gpio_banks; bank++) {
668 unsigned pin = (32 * bank) + j;
669 void __iomem *pio = pin_to_controller(pin);
670 unsigned mask = pin_to_mask(pin);
671
672 if (__raw_readl(pio + PIO_PSR) & mask)
673 gpio_printf(s, pio, mask);
674 else
675 seq_printf(s, "%c\t\t",
676 peripheral_function(pio, mask));
677 }
678
679 seq_printf(s, "\n");
680 }
681
682 return 0;
683 }
684
at91_gpio_open(struct inode * inode,struct file * file)685 static int at91_gpio_open(struct inode *inode, struct file *file)
686 {
687 return single_open(file, at91_gpio_show, NULL);
688 }
689
690 static const struct file_operations at91_gpio_operations = {
691 .open = at91_gpio_open,
692 .read = seq_read,
693 .llseek = seq_lseek,
694 .release = single_release,
695 };
696
at91_gpio_debugfs_init(void)697 static int __init at91_gpio_debugfs_init(void)
698 {
699 /* /sys/kernel/debug/at91_gpio */
700 (void) debugfs_create_file("at91_gpio", S_IFREG | S_IRUGO, NULL, NULL, &at91_gpio_operations);
701 return 0;
702 }
703 postcore_initcall(at91_gpio_debugfs_init);
704
705 #endif
706
707 /*--------------------------------------------------------------------------*/
708
709 /*
710 * This lock class tells lockdep that GPIO irqs are in a different
711 * category than their parents, so it won't report false recursion.
712 */
713 static struct lock_class_key gpio_lock_class;
714
715 #if defined(CONFIG_OF)
at91_gpio_irq_map(struct irq_domain * h,unsigned int virq,irq_hw_number_t hw)716 static int at91_gpio_irq_map(struct irq_domain *h, unsigned int virq,
717 irq_hw_number_t hw)
718 {
719 struct at91_gpio_chip *at91_gpio = h->host_data;
720
721 irq_set_lockdep_class(virq, &gpio_lock_class);
722
723 /*
724 * Can use the "simple" and not "edge" handler since it's
725 * shorter, and the AIC handles interrupts sanely.
726 */
727 irq_set_chip_and_handler(virq, &gpio_irqchip,
728 handle_simple_irq);
729 set_irq_flags(virq, IRQF_VALID);
730 irq_set_chip_data(virq, at91_gpio);
731
732 return 0;
733 }
734
735 static struct irq_domain_ops at91_gpio_ops = {
736 .map = at91_gpio_irq_map,
737 .xlate = irq_domain_xlate_twocell,
738 };
739
at91_gpio_of_irq_setup(struct device_node * node,struct device_node * parent)740 int __init at91_gpio_of_irq_setup(struct device_node *node,
741 struct device_node *parent)
742 {
743 struct at91_gpio_chip *prev = NULL;
744 int alias_idx = of_alias_get_id(node, "gpio");
745 struct at91_gpio_chip *at91_gpio = &gpio_chip[alias_idx];
746
747 /* Setup proper .irq_set_type function */
748 if (has_pio3())
749 gpio_irqchip.irq_set_type = alt_gpio_irq_type;
750 else
751 gpio_irqchip.irq_set_type = gpio_irq_type;
752
753 /* Disable irqs of this PIO controller */
754 __raw_writel(~0, at91_gpio->regbase + PIO_IDR);
755
756 /* Setup irq domain */
757 at91_gpio->domain = irq_domain_add_linear(node, at91_gpio->chip.ngpio,
758 &at91_gpio_ops, at91_gpio);
759 if (!at91_gpio->domain)
760 panic("at91_gpio.%d: couldn't allocate irq domain (DT).\n",
761 at91_gpio->pioc_idx);
762
763 /* Setup chained handler */
764 if (at91_gpio->pioc_idx)
765 prev = &gpio_chip[at91_gpio->pioc_idx - 1];
766
767 /* The toplevel handler handles one bank of GPIOs, except
768 * on some SoC it can handles up to three...
769 * We only set up the handler for the first of the list.
770 */
771 if (prev && prev->next == at91_gpio)
772 return 0;
773
774 at91_gpio->pioc_virq = irq_create_mapping(irq_find_host(parent),
775 at91_gpio->pioc_hwirq);
776 irq_set_chip_data(at91_gpio->pioc_virq, at91_gpio);
777 irq_set_chained_handler(at91_gpio->pioc_virq, gpio_irq_handler);
778
779 return 0;
780 }
781 #else
at91_gpio_of_irq_setup(struct device_node * node,struct device_node * parent)782 int __init at91_gpio_of_irq_setup(struct device_node *node,
783 struct device_node *parent)
784 {
785 return -EINVAL;
786 }
787 #endif
788
789 /*
790 * irqdomain initialization: pile up irqdomains on top of AIC range
791 */
at91_gpio_irqdomain(struct at91_gpio_chip * at91_gpio)792 static void __init at91_gpio_irqdomain(struct at91_gpio_chip *at91_gpio)
793 {
794 int irq_base;
795
796 irq_base = irq_alloc_descs(-1, 0, at91_gpio->chip.ngpio, 0);
797 if (irq_base < 0)
798 panic("at91_gpio.%d: error %d: couldn't allocate IRQ numbers.\n",
799 at91_gpio->pioc_idx, irq_base);
800 at91_gpio->domain = irq_domain_add_legacy(NULL, at91_gpio->chip.ngpio,
801 irq_base, 0,
802 &irq_domain_simple_ops, NULL);
803 if (!at91_gpio->domain)
804 panic("at91_gpio.%d: couldn't allocate irq domain.\n",
805 at91_gpio->pioc_idx);
806 }
807
808 /*
809 * Called from the processor-specific init to enable GPIO interrupt support.
810 */
at91_gpio_irq_setup(void)811 void __init at91_gpio_irq_setup(void)
812 {
813 unsigned pioc;
814 int gpio_irqnbr = 0;
815 struct at91_gpio_chip *this, *prev;
816
817 /* Setup proper .irq_set_type function */
818 if (has_pio3())
819 gpio_irqchip.irq_set_type = alt_gpio_irq_type;
820 else
821 gpio_irqchip.irq_set_type = gpio_irq_type;
822
823 for (pioc = 0, this = gpio_chip, prev = NULL;
824 pioc++ < gpio_banks;
825 prev = this, this++) {
826 int offset;
827
828 __raw_writel(~0, this->regbase + PIO_IDR);
829
830 /* setup irq domain for this GPIO controller */
831 at91_gpio_irqdomain(this);
832
833 for (offset = 0; offset < this->chip.ngpio; offset++) {
834 unsigned int virq = irq_find_mapping(this->domain, offset);
835 irq_set_lockdep_class(virq, &gpio_lock_class);
836
837 /*
838 * Can use the "simple" and not "edge" handler since it's
839 * shorter, and the AIC handles interrupts sanely.
840 */
841 irq_set_chip_and_handler(virq, &gpio_irqchip,
842 handle_simple_irq);
843 set_irq_flags(virq, IRQF_VALID);
844 irq_set_chip_data(virq, this);
845
846 gpio_irqnbr++;
847 }
848
849 /* The toplevel handler handles one bank of GPIOs, except
850 * on some SoC it can handles up to three...
851 * We only set up the handler for the first of the list.
852 */
853 if (prev && prev->next == this)
854 continue;
855
856 this->pioc_virq = irq_create_mapping(NULL, this->pioc_hwirq);
857 irq_set_chip_data(this->pioc_virq, this);
858 irq_set_chained_handler(this->pioc_virq, gpio_irq_handler);
859 }
860 pr_info("AT91: %d gpio irqs in %d banks\n", gpio_irqnbr, gpio_banks);
861 }
862
863 /* gpiolib support */
at91_gpiolib_direction_input(struct gpio_chip * chip,unsigned offset)864 static int at91_gpiolib_direction_input(struct gpio_chip *chip,
865 unsigned offset)
866 {
867 struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip);
868 void __iomem *pio = at91_gpio->regbase;
869 unsigned mask = 1 << offset;
870
871 __raw_writel(mask, pio + PIO_ODR);
872 return 0;
873 }
874
at91_gpiolib_direction_output(struct gpio_chip * chip,unsigned offset,int val)875 static int at91_gpiolib_direction_output(struct gpio_chip *chip,
876 unsigned offset, int val)
877 {
878 struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip);
879 void __iomem *pio = at91_gpio->regbase;
880 unsigned mask = 1 << offset;
881
882 __raw_writel(mask, pio + (val ? PIO_SODR : PIO_CODR));
883 __raw_writel(mask, pio + PIO_OER);
884 return 0;
885 }
886
at91_gpiolib_get(struct gpio_chip * chip,unsigned offset)887 static int at91_gpiolib_get(struct gpio_chip *chip, unsigned offset)
888 {
889 struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip);
890 void __iomem *pio = at91_gpio->regbase;
891 unsigned mask = 1 << offset;
892 u32 pdsr;
893
894 pdsr = __raw_readl(pio + PIO_PDSR);
895 return (pdsr & mask) != 0;
896 }
897
at91_gpiolib_set(struct gpio_chip * chip,unsigned offset,int val)898 static void at91_gpiolib_set(struct gpio_chip *chip, unsigned offset, int val)
899 {
900 struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip);
901 void __iomem *pio = at91_gpio->regbase;
902 unsigned mask = 1 << offset;
903
904 __raw_writel(mask, pio + (val ? PIO_SODR : PIO_CODR));
905 }
906
at91_gpiolib_dbg_show(struct seq_file * s,struct gpio_chip * chip)907 static void at91_gpiolib_dbg_show(struct seq_file *s, struct gpio_chip *chip)
908 {
909 int i;
910
911 for (i = 0; i < chip->ngpio; i++) {
912 unsigned pin = chip->base + i;
913 void __iomem *pio = pin_to_controller(pin);
914 unsigned mask = pin_to_mask(pin);
915 const char *gpio_label;
916
917 gpio_label = gpiochip_is_requested(chip, i);
918 if (gpio_label) {
919 seq_printf(s, "[%s] GPIO%s%d: ",
920 gpio_label, chip->label, i);
921 if (__raw_readl(pio + PIO_PSR) & mask)
922 seq_printf(s, "[gpio] %s\n",
923 at91_get_gpio_value(pin) ?
924 "set" : "clear");
925 else
926 seq_printf(s, "[periph %c]\n",
927 peripheral_function(pio, mask));
928 }
929 }
930 }
931
at91_gpiolib_to_irq(struct gpio_chip * chip,unsigned offset)932 static int at91_gpiolib_to_irq(struct gpio_chip *chip, unsigned offset)
933 {
934 struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip);
935 int virq;
936
937 if (offset < chip->ngpio)
938 virq = irq_create_mapping(at91_gpio->domain, offset);
939 else
940 virq = -ENXIO;
941
942 dev_dbg(chip->dev, "%s: request IRQ for GPIO %d, return %d\n",
943 chip->label, offset + chip->base, virq);
944 return virq;
945 }
946
at91_gpio_setup_clk(int idx)947 static int __init at91_gpio_setup_clk(int idx)
948 {
949 struct at91_gpio_chip *at91_gpio = &gpio_chip[idx];
950
951 /* retreive PIO controller's clock */
952 at91_gpio->clock = clk_get_sys(NULL, at91_gpio->chip.label);
953 if (IS_ERR(at91_gpio->clock)) {
954 pr_err("at91_gpio.%d, failed to get clock, ignoring.\n", idx);
955 goto err;
956 }
957
958 if (clk_prepare(at91_gpio->clock))
959 goto clk_prep_err;
960
961 /* enable PIO controller's clock */
962 if (clk_enable(at91_gpio->clock)) {
963 pr_err("at91_gpio.%d, failed to enable clock, ignoring.\n", idx);
964 goto clk_err;
965 }
966
967 return 0;
968
969 clk_err:
970 clk_unprepare(at91_gpio->clock);
971 clk_prep_err:
972 clk_put(at91_gpio->clock);
973 err:
974 return -EINVAL;
975 }
976
977 #ifdef CONFIG_OF_GPIO
of_at91_gpio_init_one(struct device_node * np)978 static void __init of_at91_gpio_init_one(struct device_node *np)
979 {
980 int alias_idx;
981 struct at91_gpio_chip *at91_gpio;
982
983 if (!np)
984 return;
985
986 alias_idx = of_alias_get_id(np, "gpio");
987 if (alias_idx >= MAX_GPIO_BANKS) {
988 pr_err("at91_gpio, failed alias idx(%d) > MAX_GPIO_BANKS(%d), ignoring.\n",
989 alias_idx, MAX_GPIO_BANKS);
990 return;
991 }
992
993 at91_gpio = &gpio_chip[alias_idx];
994 at91_gpio->chip.base = alias_idx * at91_gpio->chip.ngpio;
995
996 at91_gpio->regbase = of_iomap(np, 0);
997 if (!at91_gpio->regbase) {
998 pr_err("at91_gpio.%d, failed to map registers, ignoring.\n",
999 alias_idx);
1000 return;
1001 }
1002
1003 /* Get the interrupts property */
1004 if (of_property_read_u32(np, "interrupts", &at91_gpio->pioc_hwirq)) {
1005 pr_err("at91_gpio.%d, failed to get interrupts property, ignoring.\n",
1006 alias_idx);
1007 goto ioremap_err;
1008 }
1009
1010 /* Get capabilities from compatibility property */
1011 if (of_device_is_compatible(np, "atmel,at91sam9x5-gpio"))
1012 at91_gpio_caps |= AT91_GPIO_CAP_PIO3;
1013
1014 /* Setup clock */
1015 if (at91_gpio_setup_clk(alias_idx))
1016 goto ioremap_err;
1017
1018 at91_gpio->chip.of_node = np;
1019 gpio_banks = max(gpio_banks, alias_idx + 1);
1020 at91_gpio->pioc_idx = alias_idx;
1021 return;
1022
1023 ioremap_err:
1024 iounmap(at91_gpio->regbase);
1025 }
1026
of_at91_gpio_init(void)1027 static int __init of_at91_gpio_init(void)
1028 {
1029 struct device_node *np = NULL;
1030
1031 /*
1032 * This isn't ideal, but it gets things hooked up until this
1033 * driver is converted into a platform_device
1034 */
1035 for_each_compatible_node(np, NULL, "atmel,at91rm9200-gpio")
1036 of_at91_gpio_init_one(np);
1037
1038 return gpio_banks > 0 ? 0 : -EINVAL;
1039 }
1040 #else
of_at91_gpio_init(void)1041 static int __init of_at91_gpio_init(void)
1042 {
1043 return -EINVAL;
1044 }
1045 #endif
1046
at91_gpio_init_one(int idx,u32 regbase,int pioc_hwirq)1047 static void __init at91_gpio_init_one(int idx, u32 regbase, int pioc_hwirq)
1048 {
1049 struct at91_gpio_chip *at91_gpio = &gpio_chip[idx];
1050
1051 at91_gpio->chip.base = idx * at91_gpio->chip.ngpio;
1052 at91_gpio->pioc_hwirq = pioc_hwirq;
1053 at91_gpio->pioc_idx = idx;
1054
1055 at91_gpio->regbase = ioremap(regbase, 512);
1056 if (!at91_gpio->regbase) {
1057 pr_err("at91_gpio.%d, failed to map registers, ignoring.\n", idx);
1058 return;
1059 }
1060
1061 if (at91_gpio_setup_clk(idx))
1062 goto ioremap_err;
1063
1064 gpio_banks = max(gpio_banks, idx + 1);
1065 return;
1066
1067 ioremap_err:
1068 iounmap(at91_gpio->regbase);
1069 }
1070
1071 /*
1072 * Called from the processor-specific init to enable GPIO pin support.
1073 */
at91_gpio_init(struct at91_gpio_bank * data,int nr_banks)1074 void __init at91_gpio_init(struct at91_gpio_bank *data, int nr_banks)
1075 {
1076 unsigned i;
1077 struct at91_gpio_chip *at91_gpio, *last = NULL;
1078
1079 BUG_ON(nr_banks > MAX_GPIO_BANKS);
1080
1081 if (of_at91_gpio_init() < 0) {
1082 /* No GPIO controller found in device tree */
1083 for (i = 0; i < nr_banks; i++)
1084 at91_gpio_init_one(i, data[i].regbase, data[i].id);
1085 }
1086
1087 for (i = 0; i < gpio_banks; i++) {
1088 at91_gpio = &gpio_chip[i];
1089
1090 /*
1091 * GPIO controller are grouped on some SoC:
1092 * PIOC, PIOD and PIOE can share the same IRQ line
1093 */
1094 if (last && last->pioc_hwirq == at91_gpio->pioc_hwirq)
1095 last->next = at91_gpio;
1096 last = at91_gpio;
1097
1098 gpiochip_add(&at91_gpio->chip);
1099 }
1100 }
1101