2 * Driver for Broadcom BCM2835 GPIO unit (pinctrl + GPIO)
4 * Copyright (C) 2012 Chris Boot, Simon Arlott, Stephen Warren
6 * This driver is inspired by:
7 * pinctrl-nomadik.c, please see original file for copyright information
8 * pinctrl-tegra.c, please see original file for copyright information
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
21 #include <linux/bitmap.h>
22 #include <linux/bug.h>
23 #include <linux/delay.h>
24 #include <linux/device.h>
25 #include <linux/err.h>
26 #include <linux/gpio/driver.h>
28 #include <linux/irq.h>
29 #include <linux/irqdesc.h>
30 #include <linux/init.h>
31 #include <linux/of_address.h>
33 #include <linux/of_irq.h>
34 #include <linux/pinctrl/consumer.h>
35 #include <linux/pinctrl/machine.h>
36 #include <linux/pinctrl/pinconf.h>
37 #include <linux/pinctrl/pinctrl.h>
38 #include <linux/pinctrl/pinmux.h>
39 #include <linux/platform_device.h>
40 #include <linux/seq_file.h>
41 #include <linux/slab.h>
42 #include <linux/spinlock.h>
43 #include <linux/types.h>
45 #define MODULE_NAME "pinctrl-bcm2835"
46 #define BCM2835_NUM_GPIOS 54
47 #define BCM2835_NUM_BANKS 2
48 #define BCM2835_NUM_IRQS 3
50 #define BCM2835_PIN_BITMAP_SZ \
51 DIV_ROUND_UP(BCM2835_NUM_GPIOS, sizeof(unsigned long) * 8)
53 /* GPIO register offsets */
54 #define GPFSEL0 0x0 /* Function Select */
55 #define GPSET0 0x1c /* Pin Output Set */
56 #define GPCLR0 0x28 /* Pin Output Clear */
57 #define GPLEV0 0x34 /* Pin Level */
58 #define GPEDS0 0x40 /* Pin Event Detect Status */
59 #define GPREN0 0x4c /* Pin Rising Edge Detect Enable */
60 #define GPFEN0 0x58 /* Pin Falling Edge Detect Enable */
61 #define GPHEN0 0x64 /* Pin High Detect Enable */
62 #define GPLEN0 0x70 /* Pin Low Detect Enable */
63 #define GPAREN0 0x7c /* Pin Async Rising Edge Detect */
64 #define GPAFEN0 0x88 /* Pin Async Falling Edge Detect */
65 #define GPPUD 0x94 /* Pin Pull-up/down Enable */
66 #define GPPUDCLK0 0x98 /* Pin Pull-up/down Enable Clock */
68 #define FSEL_REG(p) (GPFSEL0 + (((p) / 10) * 4))
69 #define FSEL_SHIFT(p) (((p) % 10) * 3)
70 #define GPIO_REG_OFFSET(p) ((p) / 32)
71 #define GPIO_REG_SHIFT(p) ((p) % 32)
73 enum bcm2835_pinconf_param {
74 /* argument: bcm2835_pinconf_pull */
75 BCM2835_PINCONF_PARAM_PULL,
78 #define BCM2835_PINCONF_PACK(_param_, _arg_) ((_param_) << 16 | (_arg_))
79 #define BCM2835_PINCONF_UNPACK_PARAM(_conf_) ((_conf_) >> 16)
80 #define BCM2835_PINCONF_UNPACK_ARG(_conf_) ((_conf_) & 0xffff)
82 struct bcm2835_pinctrl {
85 int irq[BCM2835_NUM_IRQS];
87 /* note: locking assumes each bank will have its own unsigned long */
88 unsigned long enabled_irq_map[BCM2835_NUM_BANKS];
89 unsigned int irq_type[BCM2835_NUM_GPIOS];
91 struct pinctrl_dev *pctl_dev;
92 struct gpio_chip gpio_chip;
93 struct pinctrl_gpio_range gpio_range;
95 spinlock_t irq_lock[BCM2835_NUM_BANKS];
98 /* pins are just named GPIO0..GPIO53 */
99 #define BCM2835_GPIO_PIN(a) PINCTRL_PIN(a, "gpio" #a)
100 static struct pinctrl_pin_desc bcm2835_gpio_pins[] = {
111 BCM2835_GPIO_PIN(10),
112 BCM2835_GPIO_PIN(11),
113 BCM2835_GPIO_PIN(12),
114 BCM2835_GPIO_PIN(13),
115 BCM2835_GPIO_PIN(14),
116 BCM2835_GPIO_PIN(15),
117 BCM2835_GPIO_PIN(16),
118 BCM2835_GPIO_PIN(17),
119 BCM2835_GPIO_PIN(18),
120 BCM2835_GPIO_PIN(19),
121 BCM2835_GPIO_PIN(20),
122 BCM2835_GPIO_PIN(21),
123 BCM2835_GPIO_PIN(22),
124 BCM2835_GPIO_PIN(23),
125 BCM2835_GPIO_PIN(24),
126 BCM2835_GPIO_PIN(25),
127 BCM2835_GPIO_PIN(26),
128 BCM2835_GPIO_PIN(27),
129 BCM2835_GPIO_PIN(28),
130 BCM2835_GPIO_PIN(29),
131 BCM2835_GPIO_PIN(30),
132 BCM2835_GPIO_PIN(31),
133 BCM2835_GPIO_PIN(32),
134 BCM2835_GPIO_PIN(33),
135 BCM2835_GPIO_PIN(34),
136 BCM2835_GPIO_PIN(35),
137 BCM2835_GPIO_PIN(36),
138 BCM2835_GPIO_PIN(37),
139 BCM2835_GPIO_PIN(38),
140 BCM2835_GPIO_PIN(39),
141 BCM2835_GPIO_PIN(40),
142 BCM2835_GPIO_PIN(41),
143 BCM2835_GPIO_PIN(42),
144 BCM2835_GPIO_PIN(43),
145 BCM2835_GPIO_PIN(44),
146 BCM2835_GPIO_PIN(45),
147 BCM2835_GPIO_PIN(46),
148 BCM2835_GPIO_PIN(47),
149 BCM2835_GPIO_PIN(48),
150 BCM2835_GPIO_PIN(49),
151 BCM2835_GPIO_PIN(50),
152 BCM2835_GPIO_PIN(51),
153 BCM2835_GPIO_PIN(52),
154 BCM2835_GPIO_PIN(53),
157 /* one pin per group */
158 static const char * const bcm2835_gpio_groups[] = {
216 BCM2835_FSEL_GPIO_IN = 0,
217 BCM2835_FSEL_GPIO_OUT = 1,
218 BCM2835_FSEL_ALT0 = 4,
219 BCM2835_FSEL_ALT1 = 5,
220 BCM2835_FSEL_ALT2 = 6,
221 BCM2835_FSEL_ALT3 = 7,
222 BCM2835_FSEL_ALT4 = 3,
223 BCM2835_FSEL_ALT5 = 2,
224 BCM2835_FSEL_COUNT = 8,
225 BCM2835_FSEL_MASK = 0x7,
228 static const char * const bcm2835_functions[BCM2835_FSEL_COUNT] = {
229 [BCM2835_FSEL_GPIO_IN] = "gpio_in",
230 [BCM2835_FSEL_GPIO_OUT] = "gpio_out",
231 [BCM2835_FSEL_ALT0] = "alt0",
232 [BCM2835_FSEL_ALT1] = "alt1",
233 [BCM2835_FSEL_ALT2] = "alt2",
234 [BCM2835_FSEL_ALT3] = "alt3",
235 [BCM2835_FSEL_ALT4] = "alt4",
236 [BCM2835_FSEL_ALT5] = "alt5",
239 static const char * const irq_type_names[] = {
240 [IRQ_TYPE_NONE] = "none",
241 [IRQ_TYPE_EDGE_RISING] = "edge-rising",
242 [IRQ_TYPE_EDGE_FALLING] = "edge-falling",
243 [IRQ_TYPE_EDGE_BOTH] = "edge-both",
244 [IRQ_TYPE_LEVEL_HIGH] = "level-high",
245 [IRQ_TYPE_LEVEL_LOW] = "level-low",
248 static inline u32 bcm2835_gpio_rd(struct bcm2835_pinctrl *pc, unsigned reg)
250 return readl(pc->base + reg);
253 static inline void bcm2835_gpio_wr(struct bcm2835_pinctrl *pc, unsigned reg,
256 writel(val, pc->base + reg);
259 static inline int bcm2835_gpio_get_bit(struct bcm2835_pinctrl *pc, unsigned reg,
262 reg += GPIO_REG_OFFSET(bit) * 4;
263 return (bcm2835_gpio_rd(pc, reg) >> GPIO_REG_SHIFT(bit)) & 1;
266 /* note NOT a read/modify/write cycle */
267 static inline void bcm2835_gpio_set_bit(struct bcm2835_pinctrl *pc,
268 unsigned reg, unsigned bit)
270 reg += GPIO_REG_OFFSET(bit) * 4;
271 bcm2835_gpio_wr(pc, reg, BIT(GPIO_REG_SHIFT(bit)));
274 static inline enum bcm2835_fsel bcm2835_pinctrl_fsel_get(
275 struct bcm2835_pinctrl *pc, unsigned pin)
277 u32 val = bcm2835_gpio_rd(pc, FSEL_REG(pin));
278 enum bcm2835_fsel status = (val >> FSEL_SHIFT(pin)) & BCM2835_FSEL_MASK;
280 dev_dbg(pc->dev, "get %08x (%u => %s)\n", val, pin,
281 bcm2835_functions[status]);
286 static inline void bcm2835_pinctrl_fsel_set(
287 struct bcm2835_pinctrl *pc, unsigned pin,
288 enum bcm2835_fsel fsel)
290 u32 val = bcm2835_gpio_rd(pc, FSEL_REG(pin));
291 enum bcm2835_fsel cur = (val >> FSEL_SHIFT(pin)) & BCM2835_FSEL_MASK;
293 dev_dbg(pc->dev, "read %08x (%u => %s)\n", val, pin,
294 bcm2835_functions[cur]);
299 if (cur != BCM2835_FSEL_GPIO_IN && fsel != BCM2835_FSEL_GPIO_IN) {
300 /* always transition through GPIO_IN */
301 val &= ~(BCM2835_FSEL_MASK << FSEL_SHIFT(pin));
302 val |= BCM2835_FSEL_GPIO_IN << FSEL_SHIFT(pin);
304 dev_dbg(pc->dev, "trans %08x (%u <= %s)\n", val, pin,
305 bcm2835_functions[BCM2835_FSEL_GPIO_IN]);
306 bcm2835_gpio_wr(pc, FSEL_REG(pin), val);
309 val &= ~(BCM2835_FSEL_MASK << FSEL_SHIFT(pin));
310 val |= fsel << FSEL_SHIFT(pin);
312 dev_dbg(pc->dev, "write %08x (%u <= %s)\n", val, pin,
313 bcm2835_functions[fsel]);
314 bcm2835_gpio_wr(pc, FSEL_REG(pin), val);
317 static int bcm2835_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
319 return pinctrl_gpio_direction_input(chip->base + offset);
322 static int bcm2835_gpio_get(struct gpio_chip *chip, unsigned offset)
324 struct bcm2835_pinctrl *pc = gpiochip_get_data(chip);
326 return bcm2835_gpio_get_bit(pc, GPLEV0, offset);
329 static int bcm2835_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
331 struct bcm2835_pinctrl *pc = gpiochip_get_data(chip);
332 enum bcm2835_fsel fsel = bcm2835_pinctrl_fsel_get(pc, offset);
334 /* Alternative function doesn't clearly provide a direction */
335 if (fsel > BCM2835_FSEL_GPIO_OUT)
338 return (fsel == BCM2835_FSEL_GPIO_IN);
341 static void bcm2835_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
343 struct bcm2835_pinctrl *pc = gpiochip_get_data(chip);
345 bcm2835_gpio_set_bit(pc, value ? GPSET0 : GPCLR0, offset);
348 static int bcm2835_gpio_direction_output(struct gpio_chip *chip,
349 unsigned offset, int value)
351 bcm2835_gpio_set(chip, offset, value);
352 return pinctrl_gpio_direction_output(chip->base + offset);
355 static const struct gpio_chip bcm2835_gpio_chip = {
356 .label = MODULE_NAME,
357 .owner = THIS_MODULE,
358 .request = gpiochip_generic_request,
359 .free = gpiochip_generic_free,
360 .direction_input = bcm2835_gpio_direction_input,
361 .direction_output = bcm2835_gpio_direction_output,
362 .get_direction = bcm2835_gpio_get_direction,
363 .get = bcm2835_gpio_get,
364 .set = bcm2835_gpio_set,
366 .ngpio = BCM2835_NUM_GPIOS,
370 static void bcm2835_gpio_irq_handle_bank(struct bcm2835_pinctrl *pc,
371 unsigned int bank, u32 mask)
373 unsigned long events;
378 events = bcm2835_gpio_rd(pc, GPEDS0 + bank * 4);
380 events &= pc->enabled_irq_map[bank];
381 for_each_set_bit(offset, &events, 32) {
382 gpio = (32 * bank) + offset;
383 /* FIXME: no clue why the code looks up the type here */
384 type = pc->irq_type[gpio];
386 generic_handle_irq(irq_linear_revmap(pc->gpio_chip.irqdomain,
391 static void bcm2835_gpio_irq_handler(struct irq_desc *desc)
393 struct gpio_chip *chip = irq_desc_get_handler_data(desc);
394 struct bcm2835_pinctrl *pc = gpiochip_get_data(chip);
395 struct irq_chip *host_chip = irq_desc_get_chip(desc);
396 int irq = irq_desc_get_irq(desc);
400 for (i = 0; i < ARRAY_SIZE(pc->irq); i++) {
401 if (pc->irq[i] == irq) {
406 /* This should not happen, every IRQ has a bank */
407 if (i == ARRAY_SIZE(pc->irq))
410 chained_irq_enter(host_chip, desc);
413 case 0: /* IRQ0 covers GPIOs 0-27 */
414 bcm2835_gpio_irq_handle_bank(pc, 0, 0x0fffffff);
416 case 1: /* IRQ1 covers GPIOs 28-45 */
417 bcm2835_gpio_irq_handle_bank(pc, 0, 0xf0000000);
418 bcm2835_gpio_irq_handle_bank(pc, 1, 0x00003fff);
420 case 2: /* IRQ2 covers GPIOs 46-53 */
421 bcm2835_gpio_irq_handle_bank(pc, 1, 0x003fc000);
425 chained_irq_exit(host_chip, desc);
428 static inline void __bcm2835_gpio_irq_config(struct bcm2835_pinctrl *pc,
429 unsigned reg, unsigned offset, bool enable)
432 reg += GPIO_REG_OFFSET(offset) * 4;
433 value = bcm2835_gpio_rd(pc, reg);
435 value |= BIT(GPIO_REG_SHIFT(offset));
437 value &= ~(BIT(GPIO_REG_SHIFT(offset)));
438 bcm2835_gpio_wr(pc, reg, value);
441 /* fast path for IRQ handler */
442 static void bcm2835_gpio_irq_config(struct bcm2835_pinctrl *pc,
443 unsigned offset, bool enable)
445 switch (pc->irq_type[offset]) {
446 case IRQ_TYPE_EDGE_RISING:
447 __bcm2835_gpio_irq_config(pc, GPREN0, offset, enable);
450 case IRQ_TYPE_EDGE_FALLING:
451 __bcm2835_gpio_irq_config(pc, GPFEN0, offset, enable);
454 case IRQ_TYPE_EDGE_BOTH:
455 __bcm2835_gpio_irq_config(pc, GPREN0, offset, enable);
456 __bcm2835_gpio_irq_config(pc, GPFEN0, offset, enable);
459 case IRQ_TYPE_LEVEL_HIGH:
460 __bcm2835_gpio_irq_config(pc, GPHEN0, offset, enable);
463 case IRQ_TYPE_LEVEL_LOW:
464 __bcm2835_gpio_irq_config(pc, GPLEN0, offset, enable);
469 static void bcm2835_gpio_irq_enable(struct irq_data *data)
471 struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
472 struct bcm2835_pinctrl *pc = gpiochip_get_data(chip);
473 unsigned gpio = irqd_to_hwirq(data);
474 unsigned offset = GPIO_REG_SHIFT(gpio);
475 unsigned bank = GPIO_REG_OFFSET(gpio);
478 spin_lock_irqsave(&pc->irq_lock[bank], flags);
479 set_bit(offset, &pc->enabled_irq_map[bank]);
480 bcm2835_gpio_irq_config(pc, gpio, true);
481 spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
484 static void bcm2835_gpio_irq_disable(struct irq_data *data)
486 struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
487 struct bcm2835_pinctrl *pc = gpiochip_get_data(chip);
488 unsigned gpio = irqd_to_hwirq(data);
489 unsigned offset = GPIO_REG_SHIFT(gpio);
490 unsigned bank = GPIO_REG_OFFSET(gpio);
493 spin_lock_irqsave(&pc->irq_lock[bank], flags);
494 bcm2835_gpio_irq_config(pc, gpio, false);
495 /* Clear events that were latched prior to clearing event sources */
496 bcm2835_gpio_set_bit(pc, GPEDS0, gpio);
497 clear_bit(offset, &pc->enabled_irq_map[bank]);
498 spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
501 static int __bcm2835_gpio_irq_set_type_disabled(struct bcm2835_pinctrl *pc,
502 unsigned offset, unsigned int type)
506 case IRQ_TYPE_EDGE_RISING:
507 case IRQ_TYPE_EDGE_FALLING:
508 case IRQ_TYPE_EDGE_BOTH:
509 case IRQ_TYPE_LEVEL_HIGH:
510 case IRQ_TYPE_LEVEL_LOW:
511 pc->irq_type[offset] = type;
520 /* slower path for reconfiguring IRQ type */
521 static int __bcm2835_gpio_irq_set_type_enabled(struct bcm2835_pinctrl *pc,
522 unsigned offset, unsigned int type)
526 if (pc->irq_type[offset] != type) {
527 bcm2835_gpio_irq_config(pc, offset, false);
528 pc->irq_type[offset] = type;
532 case IRQ_TYPE_EDGE_RISING:
533 if (pc->irq_type[offset] == IRQ_TYPE_EDGE_BOTH) {
534 /* RISING already enabled, disable FALLING */
535 pc->irq_type[offset] = IRQ_TYPE_EDGE_FALLING;
536 bcm2835_gpio_irq_config(pc, offset, false);
537 pc->irq_type[offset] = type;
538 } else if (pc->irq_type[offset] != type) {
539 bcm2835_gpio_irq_config(pc, offset, false);
540 pc->irq_type[offset] = type;
541 bcm2835_gpio_irq_config(pc, offset, true);
545 case IRQ_TYPE_EDGE_FALLING:
546 if (pc->irq_type[offset] == IRQ_TYPE_EDGE_BOTH) {
547 /* FALLING already enabled, disable RISING */
548 pc->irq_type[offset] = IRQ_TYPE_EDGE_RISING;
549 bcm2835_gpio_irq_config(pc, offset, false);
550 pc->irq_type[offset] = type;
551 } else if (pc->irq_type[offset] != type) {
552 bcm2835_gpio_irq_config(pc, offset, false);
553 pc->irq_type[offset] = type;
554 bcm2835_gpio_irq_config(pc, offset, true);
558 case IRQ_TYPE_EDGE_BOTH:
559 if (pc->irq_type[offset] == IRQ_TYPE_EDGE_RISING) {
560 /* RISING already enabled, enable FALLING too */
561 pc->irq_type[offset] = IRQ_TYPE_EDGE_FALLING;
562 bcm2835_gpio_irq_config(pc, offset, true);
563 pc->irq_type[offset] = type;
564 } else if (pc->irq_type[offset] == IRQ_TYPE_EDGE_FALLING) {
565 /* FALLING already enabled, enable RISING too */
566 pc->irq_type[offset] = IRQ_TYPE_EDGE_RISING;
567 bcm2835_gpio_irq_config(pc, offset, true);
568 pc->irq_type[offset] = type;
569 } else if (pc->irq_type[offset] != type) {
570 bcm2835_gpio_irq_config(pc, offset, false);
571 pc->irq_type[offset] = type;
572 bcm2835_gpio_irq_config(pc, offset, true);
576 case IRQ_TYPE_LEVEL_HIGH:
577 case IRQ_TYPE_LEVEL_LOW:
578 if (pc->irq_type[offset] != type) {
579 bcm2835_gpio_irq_config(pc, offset, false);
580 pc->irq_type[offset] = type;
581 bcm2835_gpio_irq_config(pc, offset, true);
591 static int bcm2835_gpio_irq_set_type(struct irq_data *data, unsigned int type)
593 struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
594 struct bcm2835_pinctrl *pc = gpiochip_get_data(chip);
595 unsigned gpio = irqd_to_hwirq(data);
596 unsigned offset = GPIO_REG_SHIFT(gpio);
597 unsigned bank = GPIO_REG_OFFSET(gpio);
601 spin_lock_irqsave(&pc->irq_lock[bank], flags);
603 if (test_bit(offset, &pc->enabled_irq_map[bank]))
604 ret = __bcm2835_gpio_irq_set_type_enabled(pc, gpio, type);
606 ret = __bcm2835_gpio_irq_set_type_disabled(pc, gpio, type);
608 if (type & IRQ_TYPE_EDGE_BOTH)
609 irq_set_handler_locked(data, handle_edge_irq);
611 irq_set_handler_locked(data, handle_level_irq);
613 spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
618 static void bcm2835_gpio_irq_ack(struct irq_data *data)
620 struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
621 struct bcm2835_pinctrl *pc = gpiochip_get_data(chip);
622 unsigned gpio = irqd_to_hwirq(data);
624 bcm2835_gpio_set_bit(pc, GPEDS0, gpio);
627 static struct irq_chip bcm2835_gpio_irq_chip = {
629 .irq_enable = bcm2835_gpio_irq_enable,
630 .irq_disable = bcm2835_gpio_irq_disable,
631 .irq_set_type = bcm2835_gpio_irq_set_type,
632 .irq_ack = bcm2835_gpio_irq_ack,
633 .irq_mask = bcm2835_gpio_irq_disable,
634 .irq_unmask = bcm2835_gpio_irq_enable,
637 static int bcm2835_pctl_get_groups_count(struct pinctrl_dev *pctldev)
639 return ARRAY_SIZE(bcm2835_gpio_groups);
642 static const char *bcm2835_pctl_get_group_name(struct pinctrl_dev *pctldev,
645 return bcm2835_gpio_groups[selector];
648 static int bcm2835_pctl_get_group_pins(struct pinctrl_dev *pctldev,
650 const unsigned **pins,
653 *pins = &bcm2835_gpio_pins[selector].number;
659 static void bcm2835_pctl_pin_dbg_show(struct pinctrl_dev *pctldev,
663 struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
664 struct gpio_chip *chip = &pc->gpio_chip;
665 enum bcm2835_fsel fsel = bcm2835_pinctrl_fsel_get(pc, offset);
666 const char *fname = bcm2835_functions[fsel];
667 int value = bcm2835_gpio_get_bit(pc, GPLEV0, offset);
668 int irq = irq_find_mapping(chip->irqdomain, offset);
670 seq_printf(s, "function %s in %s; irq %d (%s)",
671 fname, value ? "hi" : "lo",
672 irq, irq_type_names[pc->irq_type[offset]]);
675 static void bcm2835_pctl_dt_free_map(struct pinctrl_dev *pctldev,
676 struct pinctrl_map *maps, unsigned num_maps)
680 for (i = 0; i < num_maps; i++)
681 if (maps[i].type == PIN_MAP_TYPE_CONFIGS_PIN)
682 kfree(maps[i].data.configs.configs);
687 static int bcm2835_pctl_dt_node_to_map_func(struct bcm2835_pinctrl *pc,
688 struct device_node *np, u32 pin, u32 fnum,
689 struct pinctrl_map **maps)
691 struct pinctrl_map *map = *maps;
693 if (fnum >= ARRAY_SIZE(bcm2835_functions)) {
694 dev_err(pc->dev, "%pOF: invalid brcm,function %d\n", np, fnum);
698 map->type = PIN_MAP_TYPE_MUX_GROUP;
699 map->data.mux.group = bcm2835_gpio_groups[pin];
700 map->data.mux.function = bcm2835_functions[fnum];
706 static int bcm2835_pctl_dt_node_to_map_pull(struct bcm2835_pinctrl *pc,
707 struct device_node *np, u32 pin, u32 pull,
708 struct pinctrl_map **maps)
710 struct pinctrl_map *map = *maps;
711 unsigned long *configs;
714 dev_err(pc->dev, "%pOF: invalid brcm,pull %d\n", np, pull);
718 configs = kzalloc(sizeof(*configs), GFP_KERNEL);
721 configs[0] = BCM2835_PINCONF_PACK(BCM2835_PINCONF_PARAM_PULL, pull);
723 map->type = PIN_MAP_TYPE_CONFIGS_PIN;
724 map->data.configs.group_or_pin = bcm2835_gpio_pins[pin].name;
725 map->data.configs.configs = configs;
726 map->data.configs.num_configs = 1;
732 static int bcm2835_pctl_dt_node_to_map(struct pinctrl_dev *pctldev,
733 struct device_node *np,
734 struct pinctrl_map **map, unsigned *num_maps)
736 struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
737 struct property *pins, *funcs, *pulls;
738 int num_pins, num_funcs, num_pulls, maps_per_pin;
739 struct pinctrl_map *maps, *cur_map;
743 pins = of_find_property(np, "brcm,pins", NULL);
745 dev_err(pc->dev, "%pOF: missing brcm,pins property\n", np);
749 funcs = of_find_property(np, "brcm,function", NULL);
750 pulls = of_find_property(np, "brcm,pull", NULL);
752 if (!funcs && !pulls) {
754 "%pOF: neither brcm,function nor brcm,pull specified\n",
759 num_pins = pins->length / 4;
760 num_funcs = funcs ? (funcs->length / 4) : 0;
761 num_pulls = pulls ? (pulls->length / 4) : 0;
763 if (num_funcs > 1 && num_funcs != num_pins) {
765 "%pOF: brcm,function must have 1 or %d entries\n",
770 if (num_pulls > 1 && num_pulls != num_pins) {
772 "%pOF: brcm,pull must have 1 or %d entries\n",
782 cur_map = maps = kzalloc(num_pins * maps_per_pin * sizeof(*maps),
787 for (i = 0; i < num_pins; i++) {
788 err = of_property_read_u32_index(np, "brcm,pins", i, &pin);
791 if (pin >= ARRAY_SIZE(bcm2835_gpio_pins)) {
792 dev_err(pc->dev, "%pOF: invalid brcm,pins value %d\n",
799 err = of_property_read_u32_index(np, "brcm,function",
800 (num_funcs > 1) ? i : 0, &func);
803 err = bcm2835_pctl_dt_node_to_map_func(pc, np, pin,
809 err = of_property_read_u32_index(np, "brcm,pull",
810 (num_pulls > 1) ? i : 0, &pull);
813 err = bcm2835_pctl_dt_node_to_map_pull(pc, np, pin,
821 *num_maps = num_pins * maps_per_pin;
826 bcm2835_pctl_dt_free_map(pctldev, maps, num_pins * maps_per_pin);
830 static const struct pinctrl_ops bcm2835_pctl_ops = {
831 .get_groups_count = bcm2835_pctl_get_groups_count,
832 .get_group_name = bcm2835_pctl_get_group_name,
833 .get_group_pins = bcm2835_pctl_get_group_pins,
834 .pin_dbg_show = bcm2835_pctl_pin_dbg_show,
835 .dt_node_to_map = bcm2835_pctl_dt_node_to_map,
836 .dt_free_map = bcm2835_pctl_dt_free_map,
839 static int bcm2835_pmx_free(struct pinctrl_dev *pctldev,
842 struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
844 /* disable by setting to GPIO_IN */
845 bcm2835_pinctrl_fsel_set(pc, offset, BCM2835_FSEL_GPIO_IN);
849 static int bcm2835_pmx_get_functions_count(struct pinctrl_dev *pctldev)
851 return BCM2835_FSEL_COUNT;
854 static const char *bcm2835_pmx_get_function_name(struct pinctrl_dev *pctldev,
857 return bcm2835_functions[selector];
860 static int bcm2835_pmx_get_function_groups(struct pinctrl_dev *pctldev,
862 const char * const **groups,
863 unsigned * const num_groups)
865 /* every pin can do every function */
866 *groups = bcm2835_gpio_groups;
867 *num_groups = ARRAY_SIZE(bcm2835_gpio_groups);
872 static int bcm2835_pmx_set(struct pinctrl_dev *pctldev,
873 unsigned func_selector,
874 unsigned group_selector)
876 struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
878 bcm2835_pinctrl_fsel_set(pc, group_selector, func_selector);
883 static void bcm2835_pmx_gpio_disable_free(struct pinctrl_dev *pctldev,
884 struct pinctrl_gpio_range *range,
887 struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
889 /* disable by setting to GPIO_IN */
890 bcm2835_pinctrl_fsel_set(pc, offset, BCM2835_FSEL_GPIO_IN);
893 static int bcm2835_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
894 struct pinctrl_gpio_range *range,
898 struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
899 enum bcm2835_fsel fsel = input ?
900 BCM2835_FSEL_GPIO_IN : BCM2835_FSEL_GPIO_OUT;
902 bcm2835_pinctrl_fsel_set(pc, offset, fsel);
907 static const struct pinmux_ops bcm2835_pmx_ops = {
908 .free = bcm2835_pmx_free,
909 .get_functions_count = bcm2835_pmx_get_functions_count,
910 .get_function_name = bcm2835_pmx_get_function_name,
911 .get_function_groups = bcm2835_pmx_get_function_groups,
912 .set_mux = bcm2835_pmx_set,
913 .gpio_disable_free = bcm2835_pmx_gpio_disable_free,
914 .gpio_set_direction = bcm2835_pmx_gpio_set_direction,
917 static int bcm2835_pinconf_get(struct pinctrl_dev *pctldev,
918 unsigned pin, unsigned long *config)
920 /* No way to read back config in HW */
924 static int bcm2835_pinconf_set(struct pinctrl_dev *pctldev,
925 unsigned pin, unsigned long *configs,
926 unsigned num_configs)
928 struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
929 enum bcm2835_pinconf_param param;
934 for (i = 0; i < num_configs; i++) {
935 param = BCM2835_PINCONF_UNPACK_PARAM(configs[i]);
936 arg = BCM2835_PINCONF_UNPACK_ARG(configs[i]);
938 if (param != BCM2835_PINCONF_PARAM_PULL)
941 off = GPIO_REG_OFFSET(pin);
942 bit = GPIO_REG_SHIFT(pin);
944 bcm2835_gpio_wr(pc, GPPUD, arg & 3);
946 * BCM2835 datasheet say to wait 150 cycles, but not of what.
947 * But the VideoCore firmware delay for this operation
948 * based nearly on the same amount of VPU cycles and this clock
952 bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), BIT(bit));
954 bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), 0);
955 } /* for each config */
960 static const struct pinconf_ops bcm2835_pinconf_ops = {
961 .pin_config_get = bcm2835_pinconf_get,
962 .pin_config_set = bcm2835_pinconf_set,
965 static struct pinctrl_desc bcm2835_pinctrl_desc = {
967 .pins = bcm2835_gpio_pins,
968 .npins = ARRAY_SIZE(bcm2835_gpio_pins),
969 .pctlops = &bcm2835_pctl_ops,
970 .pmxops = &bcm2835_pmx_ops,
971 .confops = &bcm2835_pinconf_ops,
972 .owner = THIS_MODULE,
975 static struct pinctrl_gpio_range bcm2835_pinctrl_gpio_range = {
977 .npins = BCM2835_NUM_GPIOS,
980 static int bcm2835_pinctrl_probe(struct platform_device *pdev)
982 struct device *dev = &pdev->dev;
983 struct device_node *np = dev->of_node;
984 struct bcm2835_pinctrl *pc;
985 struct resource iomem;
987 BUILD_BUG_ON(ARRAY_SIZE(bcm2835_gpio_pins) != BCM2835_NUM_GPIOS);
988 BUILD_BUG_ON(ARRAY_SIZE(bcm2835_gpio_groups) != BCM2835_NUM_GPIOS);
990 pc = devm_kzalloc(dev, sizeof(*pc), GFP_KERNEL);
994 platform_set_drvdata(pdev, pc);
997 err = of_address_to_resource(np, 0, &iomem);
999 dev_err(dev, "could not get IO memory\n");
1003 pc->base = devm_ioremap_resource(dev, &iomem);
1004 if (IS_ERR(pc->base))
1005 return PTR_ERR(pc->base);
1007 pc->gpio_chip = bcm2835_gpio_chip;
1008 pc->gpio_chip.parent = dev;
1009 pc->gpio_chip.of_node = np;
1011 for (i = 0; i < BCM2835_NUM_BANKS; i++) {
1012 unsigned long events;
1015 /* clear event detection flags */
1016 bcm2835_gpio_wr(pc, GPREN0 + i * 4, 0);
1017 bcm2835_gpio_wr(pc, GPFEN0 + i * 4, 0);
1018 bcm2835_gpio_wr(pc, GPHEN0 + i * 4, 0);
1019 bcm2835_gpio_wr(pc, GPLEN0 + i * 4, 0);
1020 bcm2835_gpio_wr(pc, GPAREN0 + i * 4, 0);
1021 bcm2835_gpio_wr(pc, GPAFEN0 + i * 4, 0);
1023 /* clear all the events */
1024 events = bcm2835_gpio_rd(pc, GPEDS0 + i * 4);
1025 for_each_set_bit(offset, &events, 32)
1026 bcm2835_gpio_wr(pc, GPEDS0 + i * 4, BIT(offset));
1028 spin_lock_init(&pc->irq_lock[i]);
1031 err = gpiochip_add_data(&pc->gpio_chip, pc);
1033 dev_err(dev, "could not add GPIO chip\n");
1037 err = gpiochip_irqchip_add(&pc->gpio_chip, &bcm2835_gpio_irq_chip,
1038 0, handle_level_irq, IRQ_TYPE_NONE);
1040 dev_info(dev, "could not add irqchip\n");
1044 for (i = 0; i < BCM2835_NUM_IRQS; i++) {
1045 pc->irq[i] = irq_of_parse_and_map(np, i);
1047 if (pc->irq[i] == 0)
1051 * Use the same handler for all groups: this is necessary
1052 * since we use one gpiochip to cover all lines - the
1053 * irq handler then needs to figure out which group and
1054 * bank that was firing the IRQ and look up the per-group
1057 gpiochip_set_chained_irqchip(&pc->gpio_chip,
1058 &bcm2835_gpio_irq_chip,
1060 bcm2835_gpio_irq_handler);
1063 pc->pctl_dev = devm_pinctrl_register(dev, &bcm2835_pinctrl_desc, pc);
1064 if (IS_ERR(pc->pctl_dev)) {
1065 gpiochip_remove(&pc->gpio_chip);
1066 return PTR_ERR(pc->pctl_dev);
1069 pc->gpio_range = bcm2835_pinctrl_gpio_range;
1070 pc->gpio_range.base = pc->gpio_chip.base;
1071 pc->gpio_range.gc = &pc->gpio_chip;
1072 pinctrl_add_gpio_range(pc->pctl_dev, &pc->gpio_range);
1077 static const struct of_device_id bcm2835_pinctrl_match[] = {
1078 { .compatible = "brcm,bcm2835-gpio" },
1082 static struct platform_driver bcm2835_pinctrl_driver = {
1083 .probe = bcm2835_pinctrl_probe,
1085 .name = MODULE_NAME,
1086 .of_match_table = bcm2835_pinctrl_match,
1087 .suppress_bind_attrs = true,
1090 builtin_platform_driver(bcm2835_pinctrl_driver);