1 // SPDX-License-Identifier: GPL-2.0+
3 * Driver for Broadcom BCM2835 GPIO unit (pinctrl + GPIO)
5 * Copyright (C) 2012 Chris Boot, Simon Arlott, Stephen Warren
7 * This driver is inspired by:
8 * pinctrl-nomadik.c, please see original file for copyright information
9 * pinctrl-tegra.c, please see original file for copyright information
12 #include <linux/bitmap.h>
13 #include <linux/bug.h>
14 #include <linux/delay.h>
15 #include <linux/device.h>
16 #include <linux/err.h>
17 #include <linux/gpio/driver.h>
19 #include <linux/irq.h>
20 #include <linux/irqdesc.h>
21 #include <linux/init.h>
22 #include <linux/interrupt.h>
23 #include <linux/of_address.h>
25 #include <linux/of_irq.h>
26 #include <linux/pinctrl/consumer.h>
27 #include <linux/pinctrl/machine.h>
28 #include <linux/pinctrl/pinconf.h>
29 #include <linux/pinctrl/pinctrl.h>
30 #include <linux/pinctrl/pinmux.h>
31 #include <linux/pinctrl/pinconf-generic.h>
32 #include <linux/platform_device.h>
33 #include <linux/seq_file.h>
34 #include <linux/slab.h>
35 #include <linux/spinlock.h>
36 #include <linux/types.h>
37 #include <dt-bindings/pinctrl/bcm2835.h>
39 #define MODULE_NAME "pinctrl-bcm2835"
40 #define BCM2835_NUM_GPIOS 54
41 #define BCM2711_NUM_GPIOS 58
42 #define BCM2835_NUM_BANKS 2
43 #define BCM2835_NUM_IRQS 3
45 /* GPIO register offsets */
46 #define GPFSEL0 0x0 /* Function Select */
47 #define GPSET0 0x1c /* Pin Output Set */
48 #define GPCLR0 0x28 /* Pin Output Clear */
49 #define GPLEV0 0x34 /* Pin Level */
50 #define GPEDS0 0x40 /* Pin Event Detect Status */
51 #define GPREN0 0x4c /* Pin Rising Edge Detect Enable */
52 #define GPFEN0 0x58 /* Pin Falling Edge Detect Enable */
53 #define GPHEN0 0x64 /* Pin High Detect Enable */
54 #define GPLEN0 0x70 /* Pin Low Detect Enable */
55 #define GPAREN0 0x7c /* Pin Async Rising Edge Detect */
56 #define GPAFEN0 0x88 /* Pin Async Falling Edge Detect */
57 #define GPPUD 0x94 /* Pin Pull-up/down Enable */
58 #define GPPUDCLK0 0x98 /* Pin Pull-up/down Enable Clock */
59 #define GP_GPIO_PUP_PDN_CNTRL_REG0 0xe4 /* 2711 Pin Pull-up/down select */
61 #define FSEL_REG(p) (GPFSEL0 + (((p) / 10) * 4))
62 #define FSEL_SHIFT(p) (((p) % 10) * 3)
63 #define GPIO_REG_OFFSET(p) ((p) / 32)
64 #define GPIO_REG_SHIFT(p) ((p) % 32)
66 #define PUD_2711_MASK 0x3
67 #define PUD_2711_REG_OFFSET(p) ((p) / 16)
68 #define PUD_2711_REG_SHIFT(p) (((p) % 16) * 2)
70 /* argument: bcm2835_pinconf_pull */
71 #define BCM2835_PINCONF_PARAM_PULL (PIN_CONFIG_END + 1)
73 #define BCM2711_PULL_NONE 0x0
74 #define BCM2711_PULL_UP 0x1
75 #define BCM2711_PULL_DOWN 0x2
77 struct bcm2835_pinctrl
{
82 /* note: locking assumes each bank will have its own unsigned long */
83 unsigned long enabled_irq_map
[BCM2835_NUM_BANKS
];
84 unsigned int irq_type
[BCM2711_NUM_GPIOS
];
86 struct pinctrl_dev
*pctl_dev
;
87 struct gpio_chip gpio_chip
;
88 struct pinctrl_desc pctl_desc
;
89 struct pinctrl_gpio_range gpio_range
;
91 raw_spinlock_t irq_lock
[BCM2835_NUM_BANKS
];
94 /* pins are just named GPIO0..GPIO53 */
95 #define BCM2835_GPIO_PIN(a) PINCTRL_PIN(a, "gpio" #a)
96 static struct pinctrl_pin_desc bcm2835_gpio_pins
[] = {
107 BCM2835_GPIO_PIN(10),
108 BCM2835_GPIO_PIN(11),
109 BCM2835_GPIO_PIN(12),
110 BCM2835_GPIO_PIN(13),
111 BCM2835_GPIO_PIN(14),
112 BCM2835_GPIO_PIN(15),
113 BCM2835_GPIO_PIN(16),
114 BCM2835_GPIO_PIN(17),
115 BCM2835_GPIO_PIN(18),
116 BCM2835_GPIO_PIN(19),
117 BCM2835_GPIO_PIN(20),
118 BCM2835_GPIO_PIN(21),
119 BCM2835_GPIO_PIN(22),
120 BCM2835_GPIO_PIN(23),
121 BCM2835_GPIO_PIN(24),
122 BCM2835_GPIO_PIN(25),
123 BCM2835_GPIO_PIN(26),
124 BCM2835_GPIO_PIN(27),
125 BCM2835_GPIO_PIN(28),
126 BCM2835_GPIO_PIN(29),
127 BCM2835_GPIO_PIN(30),
128 BCM2835_GPIO_PIN(31),
129 BCM2835_GPIO_PIN(32),
130 BCM2835_GPIO_PIN(33),
131 BCM2835_GPIO_PIN(34),
132 BCM2835_GPIO_PIN(35),
133 BCM2835_GPIO_PIN(36),
134 BCM2835_GPIO_PIN(37),
135 BCM2835_GPIO_PIN(38),
136 BCM2835_GPIO_PIN(39),
137 BCM2835_GPIO_PIN(40),
138 BCM2835_GPIO_PIN(41),
139 BCM2835_GPIO_PIN(42),
140 BCM2835_GPIO_PIN(43),
141 BCM2835_GPIO_PIN(44),
142 BCM2835_GPIO_PIN(45),
143 BCM2835_GPIO_PIN(46),
144 BCM2835_GPIO_PIN(47),
145 BCM2835_GPIO_PIN(48),
146 BCM2835_GPIO_PIN(49),
147 BCM2835_GPIO_PIN(50),
148 BCM2835_GPIO_PIN(51),
149 BCM2835_GPIO_PIN(52),
150 BCM2835_GPIO_PIN(53),
151 BCM2835_GPIO_PIN(54),
152 BCM2835_GPIO_PIN(55),
153 BCM2835_GPIO_PIN(56),
154 BCM2835_GPIO_PIN(57),
157 /* one pin per group */
158 static const char * const bcm2835_gpio_groups
[] = {
220 BCM2835_FSEL_COUNT
= 8,
221 BCM2835_FSEL_MASK
= 0x7,
224 static const char * const bcm2835_functions
[BCM2835_FSEL_COUNT
] = {
225 [BCM2835_FSEL_GPIO_IN
] = "gpio_in",
226 [BCM2835_FSEL_GPIO_OUT
] = "gpio_out",
227 [BCM2835_FSEL_ALT0
] = "alt0",
228 [BCM2835_FSEL_ALT1
] = "alt1",
229 [BCM2835_FSEL_ALT2
] = "alt2",
230 [BCM2835_FSEL_ALT3
] = "alt3",
231 [BCM2835_FSEL_ALT4
] = "alt4",
232 [BCM2835_FSEL_ALT5
] = "alt5",
235 static const char * const irq_type_names
[] = {
236 [IRQ_TYPE_NONE
] = "none",
237 [IRQ_TYPE_EDGE_RISING
] = "edge-rising",
238 [IRQ_TYPE_EDGE_FALLING
] = "edge-falling",
239 [IRQ_TYPE_EDGE_BOTH
] = "edge-both",
240 [IRQ_TYPE_LEVEL_HIGH
] = "level-high",
241 [IRQ_TYPE_LEVEL_LOW
] = "level-low",
244 static inline u32
bcm2835_gpio_rd(struct bcm2835_pinctrl
*pc
, unsigned reg
)
246 return readl(pc
->base
+ reg
);
249 static inline void bcm2835_gpio_wr(struct bcm2835_pinctrl
*pc
, unsigned reg
,
252 writel(val
, pc
->base
+ reg
);
255 static inline int bcm2835_gpio_get_bit(struct bcm2835_pinctrl
*pc
, unsigned reg
,
258 reg
+= GPIO_REG_OFFSET(bit
) * 4;
259 return (bcm2835_gpio_rd(pc
, reg
) >> GPIO_REG_SHIFT(bit
)) & 1;
262 /* note NOT a read/modify/write cycle */
263 static inline void bcm2835_gpio_set_bit(struct bcm2835_pinctrl
*pc
,
264 unsigned reg
, unsigned bit
)
266 reg
+= GPIO_REG_OFFSET(bit
) * 4;
267 bcm2835_gpio_wr(pc
, reg
, BIT(GPIO_REG_SHIFT(bit
)));
270 static inline enum bcm2835_fsel
bcm2835_pinctrl_fsel_get(
271 struct bcm2835_pinctrl
*pc
, unsigned pin
)
273 u32 val
= bcm2835_gpio_rd(pc
, FSEL_REG(pin
));
274 enum bcm2835_fsel status
= (val
>> FSEL_SHIFT(pin
)) & BCM2835_FSEL_MASK
;
276 dev_dbg(pc
->dev
, "get %08x (%u => %s)\n", val
, pin
,
277 bcm2835_functions
[status
]);
282 static inline void bcm2835_pinctrl_fsel_set(
283 struct bcm2835_pinctrl
*pc
, unsigned pin
,
284 enum bcm2835_fsel fsel
)
286 u32 val
= bcm2835_gpio_rd(pc
, FSEL_REG(pin
));
287 enum bcm2835_fsel cur
= (val
>> FSEL_SHIFT(pin
)) & BCM2835_FSEL_MASK
;
289 dev_dbg(pc
->dev
, "read %08x (%u => %s)\n", val
, pin
,
290 bcm2835_functions
[cur
]);
295 if (cur
!= BCM2835_FSEL_GPIO_IN
&& fsel
!= BCM2835_FSEL_GPIO_IN
) {
296 /* always transition through GPIO_IN */
297 val
&= ~(BCM2835_FSEL_MASK
<< FSEL_SHIFT(pin
));
298 val
|= BCM2835_FSEL_GPIO_IN
<< FSEL_SHIFT(pin
);
300 dev_dbg(pc
->dev
, "trans %08x (%u <= %s)\n", val
, pin
,
301 bcm2835_functions
[BCM2835_FSEL_GPIO_IN
]);
302 bcm2835_gpio_wr(pc
, FSEL_REG(pin
), val
);
305 val
&= ~(BCM2835_FSEL_MASK
<< FSEL_SHIFT(pin
));
306 val
|= fsel
<< FSEL_SHIFT(pin
);
308 dev_dbg(pc
->dev
, "write %08x (%u <= %s)\n", val
, pin
,
309 bcm2835_functions
[fsel
]);
310 bcm2835_gpio_wr(pc
, FSEL_REG(pin
), val
);
313 static int bcm2835_gpio_direction_input(struct gpio_chip
*chip
, unsigned offset
)
315 return pinctrl_gpio_direction_input(chip
->base
+ offset
);
318 static int bcm2835_gpio_get(struct gpio_chip
*chip
, unsigned offset
)
320 struct bcm2835_pinctrl
*pc
= gpiochip_get_data(chip
);
322 return bcm2835_gpio_get_bit(pc
, GPLEV0
, offset
);
325 static int bcm2835_gpio_get_direction(struct gpio_chip
*chip
, unsigned int offset
)
327 struct bcm2835_pinctrl
*pc
= gpiochip_get_data(chip
);
328 enum bcm2835_fsel fsel
= bcm2835_pinctrl_fsel_get(pc
, offset
);
330 /* Alternative function doesn't clearly provide a direction */
331 if (fsel
> BCM2835_FSEL_GPIO_OUT
)
334 if (fsel
== BCM2835_FSEL_GPIO_IN
)
335 return GPIO_LINE_DIRECTION_IN
;
337 return GPIO_LINE_DIRECTION_OUT
;
340 static void bcm2835_gpio_set(struct gpio_chip
*chip
, unsigned offset
, int value
)
342 struct bcm2835_pinctrl
*pc
= gpiochip_get_data(chip
);
344 bcm2835_gpio_set_bit(pc
, value
? GPSET0
: GPCLR0
, offset
);
347 static int bcm2835_gpio_direction_output(struct gpio_chip
*chip
,
348 unsigned offset
, int value
)
350 bcm2835_gpio_set(chip
, offset
, value
);
351 return pinctrl_gpio_direction_output(chip
->base
+ offset
);
354 static const struct gpio_chip bcm2835_gpio_chip
= {
355 .label
= MODULE_NAME
,
356 .owner
= THIS_MODULE
,
357 .request
= gpiochip_generic_request
,
358 .free
= gpiochip_generic_free
,
359 .direction_input
= bcm2835_gpio_direction_input
,
360 .direction_output
= bcm2835_gpio_direction_output
,
361 .get_direction
= bcm2835_gpio_get_direction
,
362 .get
= bcm2835_gpio_get
,
363 .set
= bcm2835_gpio_set
,
364 .set_config
= gpiochip_generic_config
,
366 .ngpio
= BCM2835_NUM_GPIOS
,
370 static const struct gpio_chip bcm2711_gpio_chip
= {
371 .label
= "pinctrl-bcm2711",
372 .owner
= THIS_MODULE
,
373 .request
= gpiochip_generic_request
,
374 .free
= gpiochip_generic_free
,
375 .direction_input
= bcm2835_gpio_direction_input
,
376 .direction_output
= bcm2835_gpio_direction_output
,
377 .get_direction
= bcm2835_gpio_get_direction
,
378 .get
= bcm2835_gpio_get
,
379 .set
= bcm2835_gpio_set
,
380 .set_config
= gpiochip_generic_config
,
382 .ngpio
= BCM2711_NUM_GPIOS
,
386 static void bcm2835_gpio_irq_handle_bank(struct bcm2835_pinctrl
*pc
,
387 unsigned int bank
, u32 mask
)
389 unsigned long events
;
393 events
= bcm2835_gpio_rd(pc
, GPEDS0
+ bank
* 4);
395 events
&= pc
->enabled_irq_map
[bank
];
396 for_each_set_bit(offset
, &events
, 32) {
397 gpio
= (32 * bank
) + offset
;
398 generic_handle_domain_irq(pc
->gpio_chip
.irq
.domain
,
403 static void bcm2835_gpio_irq_handler(struct irq_desc
*desc
)
405 struct gpio_chip
*chip
= irq_desc_get_handler_data(desc
);
406 struct bcm2835_pinctrl
*pc
= gpiochip_get_data(chip
);
407 struct irq_chip
*host_chip
= irq_desc_get_chip(desc
);
408 int irq
= irq_desc_get_irq(desc
);
412 for (i
= 0; i
< BCM2835_NUM_IRQS
; i
++) {
413 if (chip
->irq
.parents
[i
] == irq
) {
418 /* This should not happen, every IRQ has a bank */
419 BUG_ON(i
== BCM2835_NUM_IRQS
);
421 chained_irq_enter(host_chip
, desc
);
424 case 0: /* IRQ0 covers GPIOs 0-27 */
425 bcm2835_gpio_irq_handle_bank(pc
, 0, 0x0fffffff);
427 case 1: /* IRQ1 covers GPIOs 28-45 */
428 bcm2835_gpio_irq_handle_bank(pc
, 0, 0xf0000000);
429 bcm2835_gpio_irq_handle_bank(pc
, 1, 0x00003fff);
431 case 2: /* IRQ2 covers GPIOs 46-57 */
432 bcm2835_gpio_irq_handle_bank(pc
, 1, 0x003fc000);
436 chained_irq_exit(host_chip
, desc
);
439 static irqreturn_t
bcm2835_gpio_wake_irq_handler(int irq
, void *dev_id
)
444 static inline void __bcm2835_gpio_irq_config(struct bcm2835_pinctrl
*pc
,
445 unsigned reg
, unsigned offset
, bool enable
)
448 reg
+= GPIO_REG_OFFSET(offset
) * 4;
449 value
= bcm2835_gpio_rd(pc
, reg
);
451 value
|= BIT(GPIO_REG_SHIFT(offset
));
453 value
&= ~(BIT(GPIO_REG_SHIFT(offset
)));
454 bcm2835_gpio_wr(pc
, reg
, value
);
457 /* fast path for IRQ handler */
458 static void bcm2835_gpio_irq_config(struct bcm2835_pinctrl
*pc
,
459 unsigned offset
, bool enable
)
461 switch (pc
->irq_type
[offset
]) {
462 case IRQ_TYPE_EDGE_RISING
:
463 __bcm2835_gpio_irq_config(pc
, GPREN0
, offset
, enable
);
466 case IRQ_TYPE_EDGE_FALLING
:
467 __bcm2835_gpio_irq_config(pc
, GPFEN0
, offset
, enable
);
470 case IRQ_TYPE_EDGE_BOTH
:
471 __bcm2835_gpio_irq_config(pc
, GPREN0
, offset
, enable
);
472 __bcm2835_gpio_irq_config(pc
, GPFEN0
, offset
, enable
);
475 case IRQ_TYPE_LEVEL_HIGH
:
476 __bcm2835_gpio_irq_config(pc
, GPHEN0
, offset
, enable
);
479 case IRQ_TYPE_LEVEL_LOW
:
480 __bcm2835_gpio_irq_config(pc
, GPLEN0
, offset
, enable
);
485 static void bcm2835_gpio_irq_enable(struct irq_data
*data
)
487 struct gpio_chip
*chip
= irq_data_get_irq_chip_data(data
);
488 struct bcm2835_pinctrl
*pc
= gpiochip_get_data(chip
);
489 unsigned gpio
= irqd_to_hwirq(data
);
490 unsigned offset
= GPIO_REG_SHIFT(gpio
);
491 unsigned bank
= GPIO_REG_OFFSET(gpio
);
494 raw_spin_lock_irqsave(&pc
->irq_lock
[bank
], flags
);
495 set_bit(offset
, &pc
->enabled_irq_map
[bank
]);
496 bcm2835_gpio_irq_config(pc
, gpio
, true);
497 raw_spin_unlock_irqrestore(&pc
->irq_lock
[bank
], flags
);
500 static void bcm2835_gpio_irq_disable(struct irq_data
*data
)
502 struct gpio_chip
*chip
= irq_data_get_irq_chip_data(data
);
503 struct bcm2835_pinctrl
*pc
= gpiochip_get_data(chip
);
504 unsigned gpio
= irqd_to_hwirq(data
);
505 unsigned offset
= GPIO_REG_SHIFT(gpio
);
506 unsigned bank
= GPIO_REG_OFFSET(gpio
);
509 raw_spin_lock_irqsave(&pc
->irq_lock
[bank
], flags
);
510 bcm2835_gpio_irq_config(pc
, gpio
, false);
511 /* Clear events that were latched prior to clearing event sources */
512 bcm2835_gpio_set_bit(pc
, GPEDS0
, gpio
);
513 clear_bit(offset
, &pc
->enabled_irq_map
[bank
]);
514 raw_spin_unlock_irqrestore(&pc
->irq_lock
[bank
], flags
);
517 static int __bcm2835_gpio_irq_set_type_disabled(struct bcm2835_pinctrl
*pc
,
518 unsigned offset
, unsigned int type
)
522 case IRQ_TYPE_EDGE_RISING
:
523 case IRQ_TYPE_EDGE_FALLING
:
524 case IRQ_TYPE_EDGE_BOTH
:
525 case IRQ_TYPE_LEVEL_HIGH
:
526 case IRQ_TYPE_LEVEL_LOW
:
527 pc
->irq_type
[offset
] = type
;
536 /* slower path for reconfiguring IRQ type */
537 static int __bcm2835_gpio_irq_set_type_enabled(struct bcm2835_pinctrl
*pc
,
538 unsigned offset
, unsigned int type
)
542 if (pc
->irq_type
[offset
] != type
) {
543 bcm2835_gpio_irq_config(pc
, offset
, false);
544 pc
->irq_type
[offset
] = type
;
548 case IRQ_TYPE_EDGE_RISING
:
549 if (pc
->irq_type
[offset
] == IRQ_TYPE_EDGE_BOTH
) {
550 /* RISING already enabled, disable FALLING */
551 pc
->irq_type
[offset
] = IRQ_TYPE_EDGE_FALLING
;
552 bcm2835_gpio_irq_config(pc
, offset
, false);
553 pc
->irq_type
[offset
] = type
;
554 } else if (pc
->irq_type
[offset
] != type
) {
555 bcm2835_gpio_irq_config(pc
, offset
, false);
556 pc
->irq_type
[offset
] = type
;
557 bcm2835_gpio_irq_config(pc
, offset
, true);
561 case IRQ_TYPE_EDGE_FALLING
:
562 if (pc
->irq_type
[offset
] == IRQ_TYPE_EDGE_BOTH
) {
563 /* FALLING already enabled, disable RISING */
564 pc
->irq_type
[offset
] = IRQ_TYPE_EDGE_RISING
;
565 bcm2835_gpio_irq_config(pc
, offset
, false);
566 pc
->irq_type
[offset
] = type
;
567 } else if (pc
->irq_type
[offset
] != type
) {
568 bcm2835_gpio_irq_config(pc
, offset
, false);
569 pc
->irq_type
[offset
] = type
;
570 bcm2835_gpio_irq_config(pc
, offset
, true);
574 case IRQ_TYPE_EDGE_BOTH
:
575 if (pc
->irq_type
[offset
] == IRQ_TYPE_EDGE_RISING
) {
576 /* RISING already enabled, enable FALLING too */
577 pc
->irq_type
[offset
] = IRQ_TYPE_EDGE_FALLING
;
578 bcm2835_gpio_irq_config(pc
, offset
, true);
579 pc
->irq_type
[offset
] = type
;
580 } else if (pc
->irq_type
[offset
] == IRQ_TYPE_EDGE_FALLING
) {
581 /* FALLING already enabled, enable RISING too */
582 pc
->irq_type
[offset
] = IRQ_TYPE_EDGE_RISING
;
583 bcm2835_gpio_irq_config(pc
, offset
, true);
584 pc
->irq_type
[offset
] = type
;
585 } else if (pc
->irq_type
[offset
] != type
) {
586 bcm2835_gpio_irq_config(pc
, offset
, false);
587 pc
->irq_type
[offset
] = type
;
588 bcm2835_gpio_irq_config(pc
, offset
, true);
592 case IRQ_TYPE_LEVEL_HIGH
:
593 case IRQ_TYPE_LEVEL_LOW
:
594 if (pc
->irq_type
[offset
] != type
) {
595 bcm2835_gpio_irq_config(pc
, offset
, false);
596 pc
->irq_type
[offset
] = type
;
597 bcm2835_gpio_irq_config(pc
, offset
, true);
607 static int bcm2835_gpio_irq_set_type(struct irq_data
*data
, unsigned int type
)
609 struct gpio_chip
*chip
= irq_data_get_irq_chip_data(data
);
610 struct bcm2835_pinctrl
*pc
= gpiochip_get_data(chip
);
611 unsigned gpio
= irqd_to_hwirq(data
);
612 unsigned offset
= GPIO_REG_SHIFT(gpio
);
613 unsigned bank
= GPIO_REG_OFFSET(gpio
);
617 raw_spin_lock_irqsave(&pc
->irq_lock
[bank
], flags
);
619 if (test_bit(offset
, &pc
->enabled_irq_map
[bank
]))
620 ret
= __bcm2835_gpio_irq_set_type_enabled(pc
, gpio
, type
);
622 ret
= __bcm2835_gpio_irq_set_type_disabled(pc
, gpio
, type
);
624 if (type
& IRQ_TYPE_EDGE_BOTH
)
625 irq_set_handler_locked(data
, handle_edge_irq
);
627 irq_set_handler_locked(data
, handle_level_irq
);
629 raw_spin_unlock_irqrestore(&pc
->irq_lock
[bank
], flags
);
634 static void bcm2835_gpio_irq_ack(struct irq_data
*data
)
636 struct gpio_chip
*chip
= irq_data_get_irq_chip_data(data
);
637 struct bcm2835_pinctrl
*pc
= gpiochip_get_data(chip
);
638 unsigned gpio
= irqd_to_hwirq(data
);
640 bcm2835_gpio_set_bit(pc
, GPEDS0
, gpio
);
643 static int bcm2835_gpio_irq_set_wake(struct irq_data
*data
, unsigned int on
)
645 struct gpio_chip
*chip
= irq_data_get_irq_chip_data(data
);
646 struct bcm2835_pinctrl
*pc
= gpiochip_get_data(chip
);
647 unsigned gpio
= irqd_to_hwirq(data
);
648 unsigned int irqgroup
;
656 else if (gpio
>= 28 && gpio
<= 45)
658 else if (gpio
>= 46 && gpio
<= 57)
664 ret
= enable_irq_wake(pc
->wake_irq
[irqgroup
]);
666 ret
= disable_irq_wake(pc
->wake_irq
[irqgroup
]);
671 static struct irq_chip bcm2835_gpio_irq_chip
= {
673 .irq_enable
= bcm2835_gpio_irq_enable
,
674 .irq_disable
= bcm2835_gpio_irq_disable
,
675 .irq_set_type
= bcm2835_gpio_irq_set_type
,
676 .irq_ack
= bcm2835_gpio_irq_ack
,
677 .irq_mask
= bcm2835_gpio_irq_disable
,
678 .irq_unmask
= bcm2835_gpio_irq_enable
,
679 .irq_set_wake
= bcm2835_gpio_irq_set_wake
,
680 .flags
= IRQCHIP_MASK_ON_SUSPEND
,
683 static int bcm2835_pctl_get_groups_count(struct pinctrl_dev
*pctldev
)
685 return BCM2835_NUM_GPIOS
;
688 static const char *bcm2835_pctl_get_group_name(struct pinctrl_dev
*pctldev
,
691 return bcm2835_gpio_groups
[selector
];
694 static int bcm2835_pctl_get_group_pins(struct pinctrl_dev
*pctldev
,
696 const unsigned **pins
,
699 *pins
= &bcm2835_gpio_pins
[selector
].number
;
705 static void bcm2835_pctl_pin_dbg_show(struct pinctrl_dev
*pctldev
,
709 struct bcm2835_pinctrl
*pc
= pinctrl_dev_get_drvdata(pctldev
);
710 struct gpio_chip
*chip
= &pc
->gpio_chip
;
711 enum bcm2835_fsel fsel
= bcm2835_pinctrl_fsel_get(pc
, offset
);
712 const char *fname
= bcm2835_functions
[fsel
];
713 int value
= bcm2835_gpio_get_bit(pc
, GPLEV0
, offset
);
714 int irq
= irq_find_mapping(chip
->irq
.domain
, offset
);
716 seq_printf(s
, "function %s in %s; irq %d (%s)",
717 fname
, value
? "hi" : "lo",
718 irq
, irq_type_names
[pc
->irq_type
[offset
]]);
721 static void bcm2835_pctl_dt_free_map(struct pinctrl_dev
*pctldev
,
722 struct pinctrl_map
*maps
, unsigned num_maps
)
726 for (i
= 0; i
< num_maps
; i
++)
727 if (maps
[i
].type
== PIN_MAP_TYPE_CONFIGS_PIN
)
728 kfree(maps
[i
].data
.configs
.configs
);
733 static int bcm2835_pctl_dt_node_to_map_func(struct bcm2835_pinctrl
*pc
,
734 struct device_node
*np
, u32 pin
, u32 fnum
,
735 struct pinctrl_map
**maps
)
737 struct pinctrl_map
*map
= *maps
;
739 if (fnum
>= ARRAY_SIZE(bcm2835_functions
)) {
740 dev_err(pc
->dev
, "%pOF: invalid brcm,function %d\n", np
, fnum
);
744 map
->type
= PIN_MAP_TYPE_MUX_GROUP
;
745 map
->data
.mux
.group
= bcm2835_gpio_groups
[pin
];
746 map
->data
.mux
.function
= bcm2835_functions
[fnum
];
752 static int bcm2835_pctl_dt_node_to_map_pull(struct bcm2835_pinctrl
*pc
,
753 struct device_node
*np
, u32 pin
, u32 pull
,
754 struct pinctrl_map
**maps
)
756 struct pinctrl_map
*map
= *maps
;
757 unsigned long *configs
;
760 dev_err(pc
->dev
, "%pOF: invalid brcm,pull %d\n", np
, pull
);
764 configs
= kzalloc(sizeof(*configs
), GFP_KERNEL
);
767 configs
[0] = pinconf_to_config_packed(BCM2835_PINCONF_PARAM_PULL
, pull
);
769 map
->type
= PIN_MAP_TYPE_CONFIGS_PIN
;
770 map
->data
.configs
.group_or_pin
= bcm2835_gpio_pins
[pin
].name
;
771 map
->data
.configs
.configs
= configs
;
772 map
->data
.configs
.num_configs
= 1;
778 static int bcm2835_pctl_dt_node_to_map(struct pinctrl_dev
*pctldev
,
779 struct device_node
*np
,
780 struct pinctrl_map
**map
, unsigned int *num_maps
)
782 struct bcm2835_pinctrl
*pc
= pinctrl_dev_get_drvdata(pctldev
);
783 struct property
*pins
, *funcs
, *pulls
;
784 int num_pins
, num_funcs
, num_pulls
, maps_per_pin
;
785 struct pinctrl_map
*maps
, *cur_map
;
789 /* Check for generic binding in this node */
790 err
= pinconf_generic_dt_node_to_map_all(pctldev
, np
, map
, num_maps
);
791 if (err
|| *num_maps
)
794 /* Generic binding did not find anything continue with legacy parse */
795 pins
= of_find_property(np
, "brcm,pins", NULL
);
797 dev_err(pc
->dev
, "%pOF: missing brcm,pins property\n", np
);
801 funcs
= of_find_property(np
, "brcm,function", NULL
);
802 pulls
= of_find_property(np
, "brcm,pull", NULL
);
804 if (!funcs
&& !pulls
) {
806 "%pOF: neither brcm,function nor brcm,pull specified\n",
811 num_pins
= pins
->length
/ 4;
812 num_funcs
= funcs
? (funcs
->length
/ 4) : 0;
813 num_pulls
= pulls
? (pulls
->length
/ 4) : 0;
815 if (num_funcs
> 1 && num_funcs
!= num_pins
) {
817 "%pOF: brcm,function must have 1 or %d entries\n",
822 if (num_pulls
> 1 && num_pulls
!= num_pins
) {
824 "%pOF: brcm,pull must have 1 or %d entries\n",
834 cur_map
= maps
= kcalloc(num_pins
* maps_per_pin
, sizeof(*maps
),
839 for (i
= 0; i
< num_pins
; i
++) {
840 err
= of_property_read_u32_index(np
, "brcm,pins", i
, &pin
);
843 if (pin
>= pc
->pctl_desc
.npins
) {
844 dev_err(pc
->dev
, "%pOF: invalid brcm,pins value %d\n",
851 err
= of_property_read_u32_index(np
, "brcm,function",
852 (num_funcs
> 1) ? i
: 0, &func
);
855 err
= bcm2835_pctl_dt_node_to_map_func(pc
, np
, pin
,
861 err
= of_property_read_u32_index(np
, "brcm,pull",
862 (num_pulls
> 1) ? i
: 0, &pull
);
865 err
= bcm2835_pctl_dt_node_to_map_pull(pc
, np
, pin
,
873 *num_maps
= num_pins
* maps_per_pin
;
878 bcm2835_pctl_dt_free_map(pctldev
, maps
, num_pins
* maps_per_pin
);
882 static const struct pinctrl_ops bcm2835_pctl_ops
= {
883 .get_groups_count
= bcm2835_pctl_get_groups_count
,
884 .get_group_name
= bcm2835_pctl_get_group_name
,
885 .get_group_pins
= bcm2835_pctl_get_group_pins
,
886 .pin_dbg_show
= bcm2835_pctl_pin_dbg_show
,
887 .dt_node_to_map
= bcm2835_pctl_dt_node_to_map
,
888 .dt_free_map
= bcm2835_pctl_dt_free_map
,
891 static int bcm2835_pmx_free(struct pinctrl_dev
*pctldev
,
894 struct bcm2835_pinctrl
*pc
= pinctrl_dev_get_drvdata(pctldev
);
896 /* disable by setting to GPIO_IN */
897 bcm2835_pinctrl_fsel_set(pc
, offset
, BCM2835_FSEL_GPIO_IN
);
901 static int bcm2835_pmx_get_functions_count(struct pinctrl_dev
*pctldev
)
903 return BCM2835_FSEL_COUNT
;
906 static const char *bcm2835_pmx_get_function_name(struct pinctrl_dev
*pctldev
,
909 return bcm2835_functions
[selector
];
912 static int bcm2835_pmx_get_function_groups(struct pinctrl_dev
*pctldev
,
914 const char * const **groups
,
915 unsigned * const num_groups
)
917 /* every pin can do every function */
918 *groups
= bcm2835_gpio_groups
;
919 *num_groups
= BCM2835_NUM_GPIOS
;
924 static int bcm2835_pmx_set(struct pinctrl_dev
*pctldev
,
925 unsigned func_selector
,
926 unsigned group_selector
)
928 struct bcm2835_pinctrl
*pc
= pinctrl_dev_get_drvdata(pctldev
);
930 bcm2835_pinctrl_fsel_set(pc
, group_selector
, func_selector
);
935 static void bcm2835_pmx_gpio_disable_free(struct pinctrl_dev
*pctldev
,
936 struct pinctrl_gpio_range
*range
,
939 struct bcm2835_pinctrl
*pc
= pinctrl_dev_get_drvdata(pctldev
);
941 /* disable by setting to GPIO_IN */
942 bcm2835_pinctrl_fsel_set(pc
, offset
, BCM2835_FSEL_GPIO_IN
);
945 static int bcm2835_pmx_gpio_set_direction(struct pinctrl_dev
*pctldev
,
946 struct pinctrl_gpio_range
*range
,
950 struct bcm2835_pinctrl
*pc
= pinctrl_dev_get_drvdata(pctldev
);
951 enum bcm2835_fsel fsel
= input
?
952 BCM2835_FSEL_GPIO_IN
: BCM2835_FSEL_GPIO_OUT
;
954 bcm2835_pinctrl_fsel_set(pc
, offset
, fsel
);
959 static const struct pinmux_ops bcm2835_pmx_ops
= {
960 .free
= bcm2835_pmx_free
,
961 .get_functions_count
= bcm2835_pmx_get_functions_count
,
962 .get_function_name
= bcm2835_pmx_get_function_name
,
963 .get_function_groups
= bcm2835_pmx_get_function_groups
,
964 .set_mux
= bcm2835_pmx_set
,
965 .gpio_disable_free
= bcm2835_pmx_gpio_disable_free
,
966 .gpio_set_direction
= bcm2835_pmx_gpio_set_direction
,
969 static int bcm2835_pinconf_get(struct pinctrl_dev
*pctldev
,
970 unsigned pin
, unsigned long *config
)
972 /* No way to read back config in HW */
976 static void bcm2835_pull_config_set(struct bcm2835_pinctrl
*pc
,
977 unsigned int pin
, unsigned int arg
)
981 off
= GPIO_REG_OFFSET(pin
);
982 bit
= GPIO_REG_SHIFT(pin
);
984 bcm2835_gpio_wr(pc
, GPPUD
, arg
& 3);
986 * BCM2835 datasheet say to wait 150 cycles, but not of what.
987 * But the VideoCore firmware delay for this operation
988 * based nearly on the same amount of VPU cycles and this clock
992 bcm2835_gpio_wr(pc
, GPPUDCLK0
+ (off
* 4), BIT(bit
));
994 bcm2835_gpio_wr(pc
, GPPUDCLK0
+ (off
* 4), 0);
997 static int bcm2835_pinconf_set(struct pinctrl_dev
*pctldev
,
998 unsigned int pin
, unsigned long *configs
,
999 unsigned int num_configs
)
1001 struct bcm2835_pinctrl
*pc
= pinctrl_dev_get_drvdata(pctldev
);
1005 for (i
= 0; i
< num_configs
; i
++) {
1006 param
= pinconf_to_config_param(configs
[i
]);
1007 arg
= pinconf_to_config_argument(configs
[i
]);
1010 /* Set legacy brcm,pull */
1011 case BCM2835_PINCONF_PARAM_PULL
:
1012 bcm2835_pull_config_set(pc
, pin
, arg
);
1015 /* Set pull generic bindings */
1016 case PIN_CONFIG_BIAS_DISABLE
:
1017 bcm2835_pull_config_set(pc
, pin
, BCM2835_PUD_OFF
);
1020 case PIN_CONFIG_BIAS_PULL_DOWN
:
1021 bcm2835_pull_config_set(pc
, pin
, BCM2835_PUD_DOWN
);
1024 case PIN_CONFIG_BIAS_PULL_UP
:
1025 bcm2835_pull_config_set(pc
, pin
, BCM2835_PUD_UP
);
1028 /* Set output-high or output-low */
1029 case PIN_CONFIG_OUTPUT
:
1030 bcm2835_gpio_set_bit(pc
, arg
? GPSET0
: GPCLR0
, pin
);
1036 } /* switch param type */
1037 } /* for each config */
1042 static const struct pinconf_ops bcm2835_pinconf_ops
= {
1044 .pin_config_get
= bcm2835_pinconf_get
,
1045 .pin_config_set
= bcm2835_pinconf_set
,
1048 static void bcm2711_pull_config_set(struct bcm2835_pinctrl
*pc
,
1049 unsigned int pin
, unsigned int arg
)
1055 off
= PUD_2711_REG_OFFSET(pin
);
1056 shifter
= PUD_2711_REG_SHIFT(pin
);
1058 value
= bcm2835_gpio_rd(pc
, GP_GPIO_PUP_PDN_CNTRL_REG0
+ (off
* 4));
1059 value
&= ~(PUD_2711_MASK
<< shifter
);
1060 value
|= (arg
<< shifter
);
1061 bcm2835_gpio_wr(pc
, GP_GPIO_PUP_PDN_CNTRL_REG0
+ (off
* 4), value
);
1064 static int bcm2711_pinconf_set(struct pinctrl_dev
*pctldev
,
1065 unsigned int pin
, unsigned long *configs
,
1066 unsigned int num_configs
)
1068 struct bcm2835_pinctrl
*pc
= pinctrl_dev_get_drvdata(pctldev
);
1072 for (i
= 0; i
< num_configs
; i
++) {
1073 param
= pinconf_to_config_param(configs
[i
]);
1074 arg
= pinconf_to_config_argument(configs
[i
]);
1077 /* convert legacy brcm,pull */
1078 case BCM2835_PINCONF_PARAM_PULL
:
1079 if (arg
== BCM2835_PUD_UP
)
1080 arg
= BCM2711_PULL_UP
;
1081 else if (arg
== BCM2835_PUD_DOWN
)
1082 arg
= BCM2711_PULL_DOWN
;
1084 arg
= BCM2711_PULL_NONE
;
1086 bcm2711_pull_config_set(pc
, pin
, arg
);
1089 /* Set pull generic bindings */
1090 case PIN_CONFIG_BIAS_DISABLE
:
1091 bcm2711_pull_config_set(pc
, pin
, BCM2711_PULL_NONE
);
1093 case PIN_CONFIG_BIAS_PULL_DOWN
:
1094 bcm2711_pull_config_set(pc
, pin
, BCM2711_PULL_DOWN
);
1096 case PIN_CONFIG_BIAS_PULL_UP
:
1097 bcm2711_pull_config_set(pc
, pin
, BCM2711_PULL_UP
);
1100 /* Set output-high or output-low */
1101 case PIN_CONFIG_OUTPUT
:
1102 bcm2835_gpio_set_bit(pc
, arg
? GPSET0
: GPCLR0
, pin
);
1108 } /* for each config */
1113 static const struct pinconf_ops bcm2711_pinconf_ops
= {
1115 .pin_config_get
= bcm2835_pinconf_get
,
1116 .pin_config_set
= bcm2711_pinconf_set
,
1119 static const struct pinctrl_desc bcm2835_pinctrl_desc
= {
1120 .name
= MODULE_NAME
,
1121 .pins
= bcm2835_gpio_pins
,
1122 .npins
= BCM2835_NUM_GPIOS
,
1123 .pctlops
= &bcm2835_pctl_ops
,
1124 .pmxops
= &bcm2835_pmx_ops
,
1125 .confops
= &bcm2835_pinconf_ops
,
1126 .owner
= THIS_MODULE
,
1129 static const struct pinctrl_desc bcm2711_pinctrl_desc
= {
1130 .name
= "pinctrl-bcm2711",
1131 .pins
= bcm2835_gpio_pins
,
1132 .npins
= BCM2711_NUM_GPIOS
,
1133 .pctlops
= &bcm2835_pctl_ops
,
1134 .pmxops
= &bcm2835_pmx_ops
,
1135 .confops
= &bcm2711_pinconf_ops
,
1136 .owner
= THIS_MODULE
,
1139 static const struct pinctrl_gpio_range bcm2835_pinctrl_gpio_range
= {
1140 .name
= MODULE_NAME
,
1141 .npins
= BCM2835_NUM_GPIOS
,
1144 static const struct pinctrl_gpio_range bcm2711_pinctrl_gpio_range
= {
1145 .name
= "pinctrl-bcm2711",
1146 .npins
= BCM2711_NUM_GPIOS
,
1149 struct bcm_plat_data
{
1150 const struct gpio_chip
*gpio_chip
;
1151 const struct pinctrl_desc
*pctl_desc
;
1152 const struct pinctrl_gpio_range
*gpio_range
;
1155 static const struct bcm_plat_data bcm2835_plat_data
= {
1156 .gpio_chip
= &bcm2835_gpio_chip
,
1157 .pctl_desc
= &bcm2835_pinctrl_desc
,
1158 .gpio_range
= &bcm2835_pinctrl_gpio_range
,
1161 static const struct bcm_plat_data bcm2711_plat_data
= {
1162 .gpio_chip
= &bcm2711_gpio_chip
,
1163 .pctl_desc
= &bcm2711_pinctrl_desc
,
1164 .gpio_range
= &bcm2711_pinctrl_gpio_range
,
1167 static const struct of_device_id bcm2835_pinctrl_match
[] = {
1169 .compatible
= "brcm,bcm2835-gpio",
1170 .data
= &bcm2835_plat_data
,
1173 .compatible
= "brcm,bcm2711-gpio",
1174 .data
= &bcm2711_plat_data
,
1177 .compatible
= "brcm,bcm7211-gpio",
1178 .data
= &bcm2711_plat_data
,
1183 static int bcm2835_pinctrl_probe(struct platform_device
*pdev
)
1185 struct device
*dev
= &pdev
->dev
;
1186 struct device_node
*np
= dev
->of_node
;
1187 const struct bcm_plat_data
*pdata
;
1188 struct bcm2835_pinctrl
*pc
;
1189 struct gpio_irq_chip
*girq
;
1190 struct resource iomem
;
1192 const struct of_device_id
*match
;
1195 BUILD_BUG_ON(ARRAY_SIZE(bcm2835_gpio_pins
) != BCM2711_NUM_GPIOS
);
1196 BUILD_BUG_ON(ARRAY_SIZE(bcm2835_gpio_groups
) != BCM2711_NUM_GPIOS
);
1198 pc
= devm_kzalloc(dev
, sizeof(*pc
), GFP_KERNEL
);
1202 platform_set_drvdata(pdev
, pc
);
1205 err
= of_address_to_resource(np
, 0, &iomem
);
1207 dev_err(dev
, "could not get IO memory\n");
1211 pc
->base
= devm_ioremap_resource(dev
, &iomem
);
1212 if (IS_ERR(pc
->base
))
1213 return PTR_ERR(pc
->base
);
1215 match
= of_match_node(bcm2835_pinctrl_match
, pdev
->dev
.of_node
);
1219 pdata
= match
->data
;
1220 is_7211
= of_device_is_compatible(np
, "brcm,bcm7211-gpio");
1222 pc
->gpio_chip
= *pdata
->gpio_chip
;
1223 pc
->gpio_chip
.parent
= dev
;
1224 pc
->gpio_chip
.of_node
= np
;
1226 for (i
= 0; i
< BCM2835_NUM_BANKS
; i
++) {
1227 unsigned long events
;
1230 /* clear event detection flags */
1231 bcm2835_gpio_wr(pc
, GPREN0
+ i
* 4, 0);
1232 bcm2835_gpio_wr(pc
, GPFEN0
+ i
* 4, 0);
1233 bcm2835_gpio_wr(pc
, GPHEN0
+ i
* 4, 0);
1234 bcm2835_gpio_wr(pc
, GPLEN0
+ i
* 4, 0);
1235 bcm2835_gpio_wr(pc
, GPAREN0
+ i
* 4, 0);
1236 bcm2835_gpio_wr(pc
, GPAFEN0
+ i
* 4, 0);
1238 /* clear all the events */
1239 events
= bcm2835_gpio_rd(pc
, GPEDS0
+ i
* 4);
1240 for_each_set_bit(offset
, &events
, 32)
1241 bcm2835_gpio_wr(pc
, GPEDS0
+ i
* 4, BIT(offset
));
1243 raw_spin_lock_init(&pc
->irq_lock
[i
]);
1246 pc
->pctl_desc
= *pdata
->pctl_desc
;
1247 pc
->pctl_dev
= devm_pinctrl_register(dev
, &pc
->pctl_desc
, pc
);
1248 if (IS_ERR(pc
->pctl_dev
)) {
1249 gpiochip_remove(&pc
->gpio_chip
);
1250 return PTR_ERR(pc
->pctl_dev
);
1253 pc
->gpio_range
= *pdata
->gpio_range
;
1254 pc
->gpio_range
.base
= pc
->gpio_chip
.base
;
1255 pc
->gpio_range
.gc
= &pc
->gpio_chip
;
1256 pinctrl_add_gpio_range(pc
->pctl_dev
, &pc
->gpio_range
);
1258 girq
= &pc
->gpio_chip
.irq
;
1259 girq
->chip
= &bcm2835_gpio_irq_chip
;
1260 girq
->parent_handler
= bcm2835_gpio_irq_handler
;
1261 girq
->num_parents
= BCM2835_NUM_IRQS
;
1262 girq
->parents
= devm_kcalloc(dev
, BCM2835_NUM_IRQS
,
1263 sizeof(*girq
->parents
),
1265 if (!girq
->parents
) {
1271 pc
->wake_irq
= devm_kcalloc(dev
, BCM2835_NUM_IRQS
,
1272 sizeof(*pc
->wake_irq
),
1274 if (!pc
->wake_irq
) {
1281 * Use the same handler for all groups: this is necessary
1282 * since we use one gpiochip to cover all lines - the
1283 * irq handler then needs to figure out which group and
1284 * bank that was firing the IRQ and look up the per-group
1287 for (i
= 0; i
< BCM2835_NUM_IRQS
; i
++) {
1291 girq
->parents
[i
] = irq_of_parse_and_map(np
, i
);
1293 if (!girq
->parents
[i
]) {
1294 girq
->num_parents
= i
;
1299 /* Skip over the all banks interrupts */
1300 pc
->wake_irq
[i
] = irq_of_parse_and_map(np
, i
+
1301 BCM2835_NUM_IRQS
+ 1);
1303 len
= strlen(dev_name(pc
->dev
)) + 16;
1304 name
= devm_kzalloc(pc
->dev
, len
, GFP_KERNEL
);
1310 snprintf(name
, len
, "%s:bank%d", dev_name(pc
->dev
), i
);
1312 /* These are optional interrupts */
1313 err
= devm_request_irq(dev
, pc
->wake_irq
[i
],
1314 bcm2835_gpio_wake_irq_handler
,
1315 IRQF_SHARED
, name
, pc
);
1317 dev_warn(dev
, "unable to request wake IRQ %d\n",
1321 girq
->default_type
= IRQ_TYPE_NONE
;
1322 girq
->handler
= handle_level_irq
;
1324 err
= gpiochip_add_data(&pc
->gpio_chip
, pc
);
1326 dev_err(dev
, "could not add GPIO chip\n");
1333 pinctrl_remove_gpio_range(pc
->pctl_dev
, &pc
->gpio_range
);
1337 static struct platform_driver bcm2835_pinctrl_driver
= {
1338 .probe
= bcm2835_pinctrl_probe
,
1340 .name
= MODULE_NAME
,
1341 .of_match_table
= bcm2835_pinctrl_match
,
1342 .suppress_bind_attrs
= true,
1345 builtin_platform_driver(bcm2835_pinctrl_driver
);