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>
27 #include <linux/interrupt.h>
29 #include <linux/irq.h>
30 #include <linux/irqdesc.h>
31 #include <linux/irqdomain.h>
32 #include <linux/module.h>
33 #include <linux/of_address.h>
35 #include <linux/of_irq.h>
36 #include <linux/pinctrl/consumer.h>
37 #include <linux/pinctrl/machine.h>
38 #include <linux/pinctrl/pinconf.h>
39 #include <linux/pinctrl/pinctrl.h>
40 #include <linux/pinctrl/pinmux.h>
41 #include <linux/platform_device.h>
42 #include <linux/seq_file.h>
43 #include <linux/slab.h>
44 #include <linux/spinlock.h>
45 #include <linux/types.h>
47 #define MODULE_NAME "pinctrl-bcm2835"
48 #define BCM2835_NUM_GPIOS 54
49 #define BCM2835_NUM_BANKS 2
51 #define BCM2835_PIN_BITMAP_SZ \
52 DIV_ROUND_UP(BCM2835_NUM_GPIOS, sizeof(unsigned long) * 8)
54 /* GPIO register offsets */
55 #define GPFSEL0 0x0 /* Function Select */
56 #define GPSET0 0x1c /* Pin Output Set */
57 #define GPCLR0 0x28 /* Pin Output Clear */
58 #define GPLEV0 0x34 /* Pin Level */
59 #define GPEDS0 0x40 /* Pin Event Detect Status */
60 #define GPREN0 0x4c /* Pin Rising Edge Detect Enable */
61 #define GPFEN0 0x58 /* Pin Falling Edge Detect Enable */
62 #define GPHEN0 0x64 /* Pin High Detect Enable */
63 #define GPLEN0 0x70 /* Pin Low Detect Enable */
64 #define GPAREN0 0x7c /* Pin Async Rising Edge Detect */
65 #define GPAFEN0 0x88 /* Pin Async Falling Edge Detect */
66 #define GPPUD 0x94 /* Pin Pull-up/down Enable */
67 #define GPPUDCLK0 0x98 /* Pin Pull-up/down Enable Clock */
69 #define FSEL_REG(p) (GPFSEL0 + (((p) / 10) * 4))
70 #define FSEL_SHIFT(p) (((p) % 10) * 3)
71 #define GPIO_REG_OFFSET(p) ((p) / 32)
72 #define GPIO_REG_SHIFT(p) ((p) % 32)
74 enum bcm2835_pinconf_param {
75 /* argument: bcm2835_pinconf_pull */
76 BCM2835_PINCONF_PARAM_PULL,
79 enum bcm2835_pinconf_pull {
80 BCM2835_PINCONFIG_PULL_NONE,
81 BCM2835_PINCONFIG_PULL_DOWN,
82 BCM2835_PINCONFIG_PULL_UP,
85 #define BCM2835_PINCONF_PACK(_param_, _arg_) ((_param_) << 16 | (_arg_))
86 #define BCM2835_PINCONF_UNPACK_PARAM(_conf_) ((_conf_) >> 16)
87 #define BCM2835_PINCONF_UNPACK_ARG(_conf_) ((_conf_) & 0xffff)
89 struct bcm2835_gpio_irqdata {
90 struct bcm2835_pinctrl *pc;
94 struct bcm2835_pinctrl {
97 int irq[BCM2835_NUM_BANKS];
99 /* note: locking assumes each bank will have its own unsigned long */
100 unsigned long enabled_irq_map[BCM2835_NUM_BANKS];
101 unsigned int irq_type[BCM2835_NUM_GPIOS];
103 struct pinctrl_dev *pctl_dev;
104 struct irq_domain *irq_domain;
105 struct gpio_chip gpio_chip;
106 struct pinctrl_gpio_range gpio_range;
108 struct bcm2835_gpio_irqdata irq_data[BCM2835_NUM_BANKS];
109 spinlock_t irq_lock[BCM2835_NUM_BANKS];
112 static struct lock_class_key gpio_lock_class;
114 /* pins are just named GPIO0..GPIO53 */
115 #define BCM2835_GPIO_PIN(a) PINCTRL_PIN(a, "gpio" #a)
116 static struct pinctrl_pin_desc bcm2835_gpio_pins[] = {
127 BCM2835_GPIO_PIN(10),
128 BCM2835_GPIO_PIN(11),
129 BCM2835_GPIO_PIN(12),
130 BCM2835_GPIO_PIN(13),
131 BCM2835_GPIO_PIN(14),
132 BCM2835_GPIO_PIN(15),
133 BCM2835_GPIO_PIN(16),
134 BCM2835_GPIO_PIN(17),
135 BCM2835_GPIO_PIN(18),
136 BCM2835_GPIO_PIN(19),
137 BCM2835_GPIO_PIN(20),
138 BCM2835_GPIO_PIN(21),
139 BCM2835_GPIO_PIN(22),
140 BCM2835_GPIO_PIN(23),
141 BCM2835_GPIO_PIN(24),
142 BCM2835_GPIO_PIN(25),
143 BCM2835_GPIO_PIN(26),
144 BCM2835_GPIO_PIN(27),
145 BCM2835_GPIO_PIN(28),
146 BCM2835_GPIO_PIN(29),
147 BCM2835_GPIO_PIN(30),
148 BCM2835_GPIO_PIN(31),
149 BCM2835_GPIO_PIN(32),
150 BCM2835_GPIO_PIN(33),
151 BCM2835_GPIO_PIN(34),
152 BCM2835_GPIO_PIN(35),
153 BCM2835_GPIO_PIN(36),
154 BCM2835_GPIO_PIN(37),
155 BCM2835_GPIO_PIN(38),
156 BCM2835_GPIO_PIN(39),
157 BCM2835_GPIO_PIN(40),
158 BCM2835_GPIO_PIN(41),
159 BCM2835_GPIO_PIN(42),
160 BCM2835_GPIO_PIN(43),
161 BCM2835_GPIO_PIN(44),
162 BCM2835_GPIO_PIN(45),
163 BCM2835_GPIO_PIN(46),
164 BCM2835_GPIO_PIN(47),
165 BCM2835_GPIO_PIN(48),
166 BCM2835_GPIO_PIN(49),
167 BCM2835_GPIO_PIN(50),
168 BCM2835_GPIO_PIN(51),
169 BCM2835_GPIO_PIN(52),
170 BCM2835_GPIO_PIN(53),
173 /* one pin per group */
174 static const char * const bcm2835_gpio_groups[] = {
232 BCM2835_FSEL_GPIO_IN = 0,
233 BCM2835_FSEL_GPIO_OUT = 1,
234 BCM2835_FSEL_ALT0 = 4,
235 BCM2835_FSEL_ALT1 = 5,
236 BCM2835_FSEL_ALT2 = 6,
237 BCM2835_FSEL_ALT3 = 7,
238 BCM2835_FSEL_ALT4 = 3,
239 BCM2835_FSEL_ALT5 = 2,
240 BCM2835_FSEL_COUNT = 8,
241 BCM2835_FSEL_MASK = 0x7,
244 static const char * const bcm2835_functions[BCM2835_FSEL_COUNT] = {
245 [BCM2835_FSEL_GPIO_IN] = "gpio_in",
246 [BCM2835_FSEL_GPIO_OUT] = "gpio_out",
247 [BCM2835_FSEL_ALT0] = "alt0",
248 [BCM2835_FSEL_ALT1] = "alt1",
249 [BCM2835_FSEL_ALT2] = "alt2",
250 [BCM2835_FSEL_ALT3] = "alt3",
251 [BCM2835_FSEL_ALT4] = "alt4",
252 [BCM2835_FSEL_ALT5] = "alt5",
255 static const char * const irq_type_names[] = {
256 [IRQ_TYPE_NONE] = "none",
257 [IRQ_TYPE_EDGE_RISING] = "edge-rising",
258 [IRQ_TYPE_EDGE_FALLING] = "edge-falling",
259 [IRQ_TYPE_EDGE_BOTH] = "edge-both",
260 [IRQ_TYPE_LEVEL_HIGH] = "level-high",
261 [IRQ_TYPE_LEVEL_LOW] = "level-low",
264 static inline u32 bcm2835_gpio_rd(struct bcm2835_pinctrl *pc, unsigned reg)
266 return readl(pc->base + reg);
269 static inline void bcm2835_gpio_wr(struct bcm2835_pinctrl *pc, unsigned reg,
272 writel(val, pc->base + reg);
275 static inline int bcm2835_gpio_get_bit(struct bcm2835_pinctrl *pc, unsigned reg,
278 reg += GPIO_REG_OFFSET(bit) * 4;
279 return (bcm2835_gpio_rd(pc, reg) >> GPIO_REG_SHIFT(bit)) & 1;
282 /* note NOT a read/modify/write cycle */
283 static inline void bcm2835_gpio_set_bit(struct bcm2835_pinctrl *pc,
284 unsigned reg, unsigned bit)
286 reg += GPIO_REG_OFFSET(bit) * 4;
287 bcm2835_gpio_wr(pc, reg, BIT(GPIO_REG_SHIFT(bit)));
290 static inline enum bcm2835_fsel bcm2835_pinctrl_fsel_get(
291 struct bcm2835_pinctrl *pc, unsigned pin)
293 u32 val = bcm2835_gpio_rd(pc, FSEL_REG(pin));
294 enum bcm2835_fsel status = (val >> FSEL_SHIFT(pin)) & BCM2835_FSEL_MASK;
296 dev_dbg(pc->dev, "get %08x (%u => %s)\n", val, pin,
297 bcm2835_functions[status]);
302 static inline void bcm2835_pinctrl_fsel_set(
303 struct bcm2835_pinctrl *pc, unsigned pin,
304 enum bcm2835_fsel fsel)
306 u32 val = bcm2835_gpio_rd(pc, FSEL_REG(pin));
307 enum bcm2835_fsel cur = (val >> FSEL_SHIFT(pin)) & BCM2835_FSEL_MASK;
309 dev_dbg(pc->dev, "read %08x (%u => %s)\n", val, pin,
310 bcm2835_functions[cur]);
315 if (cur != BCM2835_FSEL_GPIO_IN && fsel != BCM2835_FSEL_GPIO_IN) {
316 /* always transition through GPIO_IN */
317 val &= ~(BCM2835_FSEL_MASK << FSEL_SHIFT(pin));
318 val |= BCM2835_FSEL_GPIO_IN << FSEL_SHIFT(pin);
320 dev_dbg(pc->dev, "trans %08x (%u <= %s)\n", val, pin,
321 bcm2835_functions[BCM2835_FSEL_GPIO_IN]);
322 bcm2835_gpio_wr(pc, FSEL_REG(pin), val);
325 val &= ~(BCM2835_FSEL_MASK << FSEL_SHIFT(pin));
326 val |= fsel << FSEL_SHIFT(pin);
328 dev_dbg(pc->dev, "write %08x (%u <= %s)\n", val, pin,
329 bcm2835_functions[fsel]);
330 bcm2835_gpio_wr(pc, FSEL_REG(pin), val);
333 static int bcm2835_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
335 return pinctrl_gpio_direction_input(chip->base + offset);
338 static int bcm2835_gpio_get(struct gpio_chip *chip, unsigned offset)
340 struct bcm2835_pinctrl *pc = gpiochip_get_data(chip);
342 return bcm2835_gpio_get_bit(pc, GPLEV0, offset);
345 static int bcm2835_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
347 struct bcm2835_pinctrl *pc = gpiochip_get_data(chip);
348 enum bcm2835_fsel fsel = bcm2835_pinctrl_fsel_get(pc, offset);
350 /* Alternative function doesn't clearly provide a direction */
351 if (fsel > BCM2835_FSEL_GPIO_OUT)
354 return (fsel == BCM2835_FSEL_GPIO_IN);
357 static void bcm2835_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
359 struct bcm2835_pinctrl *pc = gpiochip_get_data(chip);
361 bcm2835_gpio_set_bit(pc, value ? GPSET0 : GPCLR0, offset);
364 static int bcm2835_gpio_direction_output(struct gpio_chip *chip,
365 unsigned offset, int value)
367 bcm2835_gpio_set(chip, offset, value);
368 return pinctrl_gpio_direction_output(chip->base + offset);
371 static int bcm2835_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
373 struct bcm2835_pinctrl *pc = gpiochip_get_data(chip);
375 return irq_linear_revmap(pc->irq_domain, offset);
378 static struct gpio_chip bcm2835_gpio_chip = {
379 .label = MODULE_NAME,
380 .owner = THIS_MODULE,
381 .request = gpiochip_generic_request,
382 .free = gpiochip_generic_free,
383 .direction_input = bcm2835_gpio_direction_input,
384 .direction_output = bcm2835_gpio_direction_output,
385 .get_direction = bcm2835_gpio_get_direction,
386 .get = bcm2835_gpio_get,
387 .set = bcm2835_gpio_set,
388 .to_irq = bcm2835_gpio_to_irq,
390 .ngpio = BCM2835_NUM_GPIOS,
394 static irqreturn_t bcm2835_gpio_irq_handler(int irq, void *dev_id)
396 struct bcm2835_gpio_irqdata *irqdata = dev_id;
397 struct bcm2835_pinctrl *pc = irqdata->pc;
398 int bank = irqdata->bank;
399 unsigned long events;
404 events = bcm2835_gpio_rd(pc, GPEDS0 + bank * 4);
405 events &= pc->enabled_irq_map[bank];
406 for_each_set_bit(offset, &events, 32) {
407 gpio = (32 * bank) + offset;
408 type = pc->irq_type[gpio];
410 generic_handle_irq(irq_linear_revmap(pc->irq_domain, gpio));
412 return events ? IRQ_HANDLED : IRQ_NONE;
415 static inline void __bcm2835_gpio_irq_config(struct bcm2835_pinctrl *pc,
416 unsigned reg, unsigned offset, bool enable)
419 reg += GPIO_REG_OFFSET(offset) * 4;
420 value = bcm2835_gpio_rd(pc, reg);
422 value |= BIT(GPIO_REG_SHIFT(offset));
424 value &= ~(BIT(GPIO_REG_SHIFT(offset)));
425 bcm2835_gpio_wr(pc, reg, value);
428 /* fast path for IRQ handler */
429 static void bcm2835_gpio_irq_config(struct bcm2835_pinctrl *pc,
430 unsigned offset, bool enable)
432 switch (pc->irq_type[offset]) {
433 case IRQ_TYPE_EDGE_RISING:
434 __bcm2835_gpio_irq_config(pc, GPREN0, offset, enable);
437 case IRQ_TYPE_EDGE_FALLING:
438 __bcm2835_gpio_irq_config(pc, GPFEN0, offset, enable);
441 case IRQ_TYPE_EDGE_BOTH:
442 __bcm2835_gpio_irq_config(pc, GPREN0, offset, enable);
443 __bcm2835_gpio_irq_config(pc, GPFEN0, offset, enable);
446 case IRQ_TYPE_LEVEL_HIGH:
447 __bcm2835_gpio_irq_config(pc, GPHEN0, offset, enable);
450 case IRQ_TYPE_LEVEL_LOW:
451 __bcm2835_gpio_irq_config(pc, GPLEN0, offset, enable);
456 static void bcm2835_gpio_irq_enable(struct irq_data *data)
458 struct bcm2835_pinctrl *pc = irq_data_get_irq_chip_data(data);
459 unsigned gpio = irqd_to_hwirq(data);
460 unsigned offset = GPIO_REG_SHIFT(gpio);
461 unsigned bank = GPIO_REG_OFFSET(gpio);
464 spin_lock_irqsave(&pc->irq_lock[bank], flags);
465 set_bit(offset, &pc->enabled_irq_map[bank]);
466 bcm2835_gpio_irq_config(pc, gpio, true);
467 spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
470 static void bcm2835_gpio_irq_disable(struct irq_data *data)
472 struct bcm2835_pinctrl *pc = irq_data_get_irq_chip_data(data);
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 bcm2835_gpio_irq_config(pc, gpio, false);
480 /* Clear events that were latched prior to clearing event sources */
481 bcm2835_gpio_set_bit(pc, GPEDS0, gpio);
482 clear_bit(offset, &pc->enabled_irq_map[bank]);
483 spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
486 static int __bcm2835_gpio_irq_set_type_disabled(struct bcm2835_pinctrl *pc,
487 unsigned offset, unsigned int type)
491 case IRQ_TYPE_EDGE_RISING:
492 case IRQ_TYPE_EDGE_FALLING:
493 case IRQ_TYPE_EDGE_BOTH:
494 case IRQ_TYPE_LEVEL_HIGH:
495 case IRQ_TYPE_LEVEL_LOW:
496 pc->irq_type[offset] = type;
505 /* slower path for reconfiguring IRQ type */
506 static int __bcm2835_gpio_irq_set_type_enabled(struct bcm2835_pinctrl *pc,
507 unsigned offset, unsigned int type)
511 if (pc->irq_type[offset] != type) {
512 bcm2835_gpio_irq_config(pc, offset, false);
513 pc->irq_type[offset] = type;
517 case IRQ_TYPE_EDGE_RISING:
518 if (pc->irq_type[offset] == IRQ_TYPE_EDGE_BOTH) {
519 /* RISING already enabled, disable FALLING */
520 pc->irq_type[offset] = IRQ_TYPE_EDGE_FALLING;
521 bcm2835_gpio_irq_config(pc, offset, false);
522 pc->irq_type[offset] = type;
523 } else if (pc->irq_type[offset] != type) {
524 bcm2835_gpio_irq_config(pc, offset, false);
525 pc->irq_type[offset] = type;
526 bcm2835_gpio_irq_config(pc, offset, true);
530 case IRQ_TYPE_EDGE_FALLING:
531 if (pc->irq_type[offset] == IRQ_TYPE_EDGE_BOTH) {
532 /* FALLING already enabled, disable RISING */
533 pc->irq_type[offset] = IRQ_TYPE_EDGE_RISING;
534 bcm2835_gpio_irq_config(pc, offset, false);
535 pc->irq_type[offset] = type;
536 } else if (pc->irq_type[offset] != type) {
537 bcm2835_gpio_irq_config(pc, offset, false);
538 pc->irq_type[offset] = type;
539 bcm2835_gpio_irq_config(pc, offset, true);
543 case IRQ_TYPE_EDGE_BOTH:
544 if (pc->irq_type[offset] == IRQ_TYPE_EDGE_RISING) {
545 /* RISING already enabled, enable FALLING too */
546 pc->irq_type[offset] = IRQ_TYPE_EDGE_FALLING;
547 bcm2835_gpio_irq_config(pc, offset, true);
548 pc->irq_type[offset] = type;
549 } else if (pc->irq_type[offset] == IRQ_TYPE_EDGE_FALLING) {
550 /* FALLING already enabled, enable RISING too */
551 pc->irq_type[offset] = IRQ_TYPE_EDGE_RISING;
552 bcm2835_gpio_irq_config(pc, offset, true);
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_LEVEL_HIGH:
562 case IRQ_TYPE_LEVEL_LOW:
563 if (pc->irq_type[offset] != type) {
564 bcm2835_gpio_irq_config(pc, offset, false);
565 pc->irq_type[offset] = type;
566 bcm2835_gpio_irq_config(pc, offset, true);
576 static int bcm2835_gpio_irq_set_type(struct irq_data *data, unsigned int type)
578 struct bcm2835_pinctrl *pc = irq_data_get_irq_chip_data(data);
579 unsigned gpio = irqd_to_hwirq(data);
580 unsigned offset = GPIO_REG_SHIFT(gpio);
581 unsigned bank = GPIO_REG_OFFSET(gpio);
585 spin_lock_irqsave(&pc->irq_lock[bank], flags);
587 if (test_bit(offset, &pc->enabled_irq_map[bank]))
588 ret = __bcm2835_gpio_irq_set_type_enabled(pc, gpio, type);
590 ret = __bcm2835_gpio_irq_set_type_disabled(pc, gpio, type);
592 if (type & IRQ_TYPE_EDGE_BOTH)
593 irq_set_handler_locked(data, handle_edge_irq);
595 irq_set_handler_locked(data, handle_level_irq);
597 spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
602 static void bcm2835_gpio_irq_ack(struct irq_data *data)
604 struct bcm2835_pinctrl *pc = irq_data_get_irq_chip_data(data);
605 unsigned gpio = irqd_to_hwirq(data);
607 bcm2835_gpio_set_bit(pc, GPEDS0, gpio);
610 static struct irq_chip bcm2835_gpio_irq_chip = {
612 .irq_enable = bcm2835_gpio_irq_enable,
613 .irq_disable = bcm2835_gpio_irq_disable,
614 .irq_set_type = bcm2835_gpio_irq_set_type,
615 .irq_ack = bcm2835_gpio_irq_ack,
616 .irq_mask = bcm2835_gpio_irq_disable,
617 .irq_unmask = bcm2835_gpio_irq_enable,
620 static int bcm2835_pctl_get_groups_count(struct pinctrl_dev *pctldev)
622 return ARRAY_SIZE(bcm2835_gpio_groups);
625 static const char *bcm2835_pctl_get_group_name(struct pinctrl_dev *pctldev,
628 return bcm2835_gpio_groups[selector];
631 static int bcm2835_pctl_get_group_pins(struct pinctrl_dev *pctldev,
633 const unsigned **pins,
636 *pins = &bcm2835_gpio_pins[selector].number;
642 static void bcm2835_pctl_pin_dbg_show(struct pinctrl_dev *pctldev,
646 struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
647 enum bcm2835_fsel fsel = bcm2835_pinctrl_fsel_get(pc, offset);
648 const char *fname = bcm2835_functions[fsel];
649 int value = bcm2835_gpio_get_bit(pc, GPLEV0, offset);
650 int irq = irq_find_mapping(pc->irq_domain, offset);
652 seq_printf(s, "function %s in %s; irq %d (%s)",
653 fname, value ? "hi" : "lo",
654 irq, irq_type_names[pc->irq_type[offset]]);
657 static void bcm2835_pctl_dt_free_map(struct pinctrl_dev *pctldev,
658 struct pinctrl_map *maps, unsigned num_maps)
662 for (i = 0; i < num_maps; i++)
663 if (maps[i].type == PIN_MAP_TYPE_CONFIGS_PIN)
664 kfree(maps[i].data.configs.configs);
669 static int bcm2835_pctl_dt_node_to_map_func(struct bcm2835_pinctrl *pc,
670 struct device_node *np, u32 pin, u32 fnum,
671 struct pinctrl_map **maps)
673 struct pinctrl_map *map = *maps;
675 if (fnum >= ARRAY_SIZE(bcm2835_functions)) {
676 dev_err(pc->dev, "%s: invalid brcm,function %d\n",
677 of_node_full_name(np), fnum);
681 map->type = PIN_MAP_TYPE_MUX_GROUP;
682 map->data.mux.group = bcm2835_gpio_groups[pin];
683 map->data.mux.function = bcm2835_functions[fnum];
689 static int bcm2835_pctl_dt_node_to_map_pull(struct bcm2835_pinctrl *pc,
690 struct device_node *np, u32 pin, u32 pull,
691 struct pinctrl_map **maps)
693 struct pinctrl_map *map = *maps;
694 unsigned long *configs;
697 dev_err(pc->dev, "%s: invalid brcm,pull %d\n",
698 of_node_full_name(np), pull);
702 configs = kzalloc(sizeof(*configs), GFP_KERNEL);
705 configs[0] = BCM2835_PINCONF_PACK(BCM2835_PINCONF_PARAM_PULL, pull);
707 map->type = PIN_MAP_TYPE_CONFIGS_PIN;
708 map->data.configs.group_or_pin = bcm2835_gpio_pins[pin].name;
709 map->data.configs.configs = configs;
710 map->data.configs.num_configs = 1;
716 static int bcm2835_pctl_dt_node_to_map(struct pinctrl_dev *pctldev,
717 struct device_node *np,
718 struct pinctrl_map **map, unsigned *num_maps)
720 struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
721 struct property *pins, *funcs, *pulls;
722 int num_pins, num_funcs, num_pulls, maps_per_pin;
723 struct pinctrl_map *maps, *cur_map;
727 pins = of_find_property(np, "brcm,pins", NULL);
729 dev_err(pc->dev, "%s: missing brcm,pins property\n",
730 of_node_full_name(np));
734 funcs = of_find_property(np, "brcm,function", NULL);
735 pulls = of_find_property(np, "brcm,pull", NULL);
737 if (!funcs && !pulls) {
739 "%s: neither brcm,function nor brcm,pull specified\n",
740 of_node_full_name(np));
744 num_pins = pins->length / 4;
745 num_funcs = funcs ? (funcs->length / 4) : 0;
746 num_pulls = pulls ? (pulls->length / 4) : 0;
748 if (num_funcs > 1 && num_funcs != num_pins) {
750 "%s: brcm,function must have 1 or %d entries\n",
751 of_node_full_name(np), num_pins);
755 if (num_pulls > 1 && num_pulls != num_pins) {
757 "%s: brcm,pull must have 1 or %d entries\n",
758 of_node_full_name(np), num_pins);
767 cur_map = maps = kzalloc(num_pins * maps_per_pin * sizeof(*maps),
772 for (i = 0; i < num_pins; i++) {
773 err = of_property_read_u32_index(np, "brcm,pins", i, &pin);
776 if (pin >= ARRAY_SIZE(bcm2835_gpio_pins)) {
777 dev_err(pc->dev, "%s: invalid brcm,pins value %d\n",
778 of_node_full_name(np), pin);
784 err = of_property_read_u32_index(np, "brcm,function",
785 (num_funcs > 1) ? i : 0, &func);
788 err = bcm2835_pctl_dt_node_to_map_func(pc, np, pin,
794 err = of_property_read_u32_index(np, "brcm,pull",
795 (num_pulls > 1) ? i : 0, &pull);
798 err = bcm2835_pctl_dt_node_to_map_pull(pc, np, pin,
806 *num_maps = num_pins * maps_per_pin;
811 bcm2835_pctl_dt_free_map(pctldev, maps, num_pins * maps_per_pin);
815 static const struct pinctrl_ops bcm2835_pctl_ops = {
816 .get_groups_count = bcm2835_pctl_get_groups_count,
817 .get_group_name = bcm2835_pctl_get_group_name,
818 .get_group_pins = bcm2835_pctl_get_group_pins,
819 .pin_dbg_show = bcm2835_pctl_pin_dbg_show,
820 .dt_node_to_map = bcm2835_pctl_dt_node_to_map,
821 .dt_free_map = bcm2835_pctl_dt_free_map,
824 static int bcm2835_pmx_get_functions_count(struct pinctrl_dev *pctldev)
826 return BCM2835_FSEL_COUNT;
829 static const char *bcm2835_pmx_get_function_name(struct pinctrl_dev *pctldev,
832 return bcm2835_functions[selector];
835 static int bcm2835_pmx_get_function_groups(struct pinctrl_dev *pctldev,
837 const char * const **groups,
838 unsigned * const num_groups)
840 /* every pin can do every function */
841 *groups = bcm2835_gpio_groups;
842 *num_groups = ARRAY_SIZE(bcm2835_gpio_groups);
847 static int bcm2835_pmx_set(struct pinctrl_dev *pctldev,
848 unsigned func_selector,
849 unsigned group_selector)
851 struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
853 bcm2835_pinctrl_fsel_set(pc, group_selector, func_selector);
858 static void bcm2835_pmx_gpio_disable_free(struct pinctrl_dev *pctldev,
859 struct pinctrl_gpio_range *range,
862 struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
864 /* disable by setting to GPIO_IN */
865 bcm2835_pinctrl_fsel_set(pc, offset, BCM2835_FSEL_GPIO_IN);
868 static int bcm2835_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
869 struct pinctrl_gpio_range *range,
873 struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
874 enum bcm2835_fsel fsel = input ?
875 BCM2835_FSEL_GPIO_IN : BCM2835_FSEL_GPIO_OUT;
877 bcm2835_pinctrl_fsel_set(pc, offset, fsel);
882 static const struct pinmux_ops bcm2835_pmx_ops = {
883 .get_functions_count = bcm2835_pmx_get_functions_count,
884 .get_function_name = bcm2835_pmx_get_function_name,
885 .get_function_groups = bcm2835_pmx_get_function_groups,
886 .set_mux = bcm2835_pmx_set,
887 .gpio_disable_free = bcm2835_pmx_gpio_disable_free,
888 .gpio_set_direction = bcm2835_pmx_gpio_set_direction,
891 static int bcm2835_pinconf_get(struct pinctrl_dev *pctldev,
892 unsigned pin, unsigned long *config)
894 /* No way to read back config in HW */
898 static int bcm2835_pinconf_set(struct pinctrl_dev *pctldev,
899 unsigned pin, unsigned long *configs,
900 unsigned num_configs)
902 struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
903 enum bcm2835_pinconf_param param;
908 for (i = 0; i < num_configs; i++) {
909 param = BCM2835_PINCONF_UNPACK_PARAM(configs[i]);
910 arg = BCM2835_PINCONF_UNPACK_ARG(configs[i]);
912 if (param != BCM2835_PINCONF_PARAM_PULL)
915 off = GPIO_REG_OFFSET(pin);
916 bit = GPIO_REG_SHIFT(pin);
918 bcm2835_gpio_wr(pc, GPPUD, arg & 3);
920 * Docs say to wait 150 cycles, but not of what. We assume a
921 * 1 MHz clock here, which is pretty slow...
924 bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), BIT(bit));
926 bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), 0);
927 } /* for each config */
932 static const struct pinconf_ops bcm2835_pinconf_ops = {
933 .pin_config_get = bcm2835_pinconf_get,
934 .pin_config_set = bcm2835_pinconf_set,
937 static struct pinctrl_desc bcm2835_pinctrl_desc = {
939 .pins = bcm2835_gpio_pins,
940 .npins = ARRAY_SIZE(bcm2835_gpio_pins),
941 .pctlops = &bcm2835_pctl_ops,
942 .pmxops = &bcm2835_pmx_ops,
943 .confops = &bcm2835_pinconf_ops,
944 .owner = THIS_MODULE,
947 static struct pinctrl_gpio_range bcm2835_pinctrl_gpio_range = {
949 .npins = BCM2835_NUM_GPIOS,
952 static int bcm2835_pinctrl_probe(struct platform_device *pdev)
954 struct device *dev = &pdev->dev;
955 struct device_node *np = dev->of_node;
956 struct bcm2835_pinctrl *pc;
957 struct resource iomem;
959 BUILD_BUG_ON(ARRAY_SIZE(bcm2835_gpio_pins) != BCM2835_NUM_GPIOS);
960 BUILD_BUG_ON(ARRAY_SIZE(bcm2835_gpio_groups) != BCM2835_NUM_GPIOS);
962 pc = devm_kzalloc(dev, sizeof(*pc), GFP_KERNEL);
966 platform_set_drvdata(pdev, pc);
969 err = of_address_to_resource(np, 0, &iomem);
971 dev_err(dev, "could not get IO memory\n");
975 pc->base = devm_ioremap_resource(dev, &iomem);
976 if (IS_ERR(pc->base))
977 return PTR_ERR(pc->base);
979 pc->gpio_chip = bcm2835_gpio_chip;
980 pc->gpio_chip.parent = dev;
981 pc->gpio_chip.of_node = np;
983 pc->irq_domain = irq_domain_add_linear(np, BCM2835_NUM_GPIOS,
984 &irq_domain_simple_ops, NULL);
985 if (!pc->irq_domain) {
986 dev_err(dev, "could not create IRQ domain\n");
990 for (i = 0; i < BCM2835_NUM_GPIOS; i++) {
991 int irq = irq_create_mapping(pc->irq_domain, i);
992 irq_set_lockdep_class(irq, &gpio_lock_class);
993 irq_set_chip_and_handler(irq, &bcm2835_gpio_irq_chip,
995 irq_set_chip_data(irq, pc);
998 for (i = 0; i < BCM2835_NUM_BANKS; i++) {
999 unsigned long events;
1004 /* clear event detection flags */
1005 bcm2835_gpio_wr(pc, GPREN0 + i * 4, 0);
1006 bcm2835_gpio_wr(pc, GPFEN0 + i * 4, 0);
1007 bcm2835_gpio_wr(pc, GPHEN0 + i * 4, 0);
1008 bcm2835_gpio_wr(pc, GPLEN0 + i * 4, 0);
1009 bcm2835_gpio_wr(pc, GPAREN0 + i * 4, 0);
1010 bcm2835_gpio_wr(pc, GPAFEN0 + i * 4, 0);
1012 /* clear all the events */
1013 events = bcm2835_gpio_rd(pc, GPEDS0 + i * 4);
1014 for_each_set_bit(offset, &events, 32)
1015 bcm2835_gpio_wr(pc, GPEDS0 + i * 4, BIT(offset));
1017 pc->irq[i] = irq_of_parse_and_map(np, i);
1018 pc->irq_data[i].pc = pc;
1019 pc->irq_data[i].bank = i;
1020 spin_lock_init(&pc->irq_lock[i]);
1022 len = strlen(dev_name(pc->dev)) + 16;
1023 name = devm_kzalloc(pc->dev, len, GFP_KERNEL);
1026 snprintf(name, len, "%s:bank%d", dev_name(pc->dev), i);
1028 err = devm_request_irq(dev, pc->irq[i],
1029 bcm2835_gpio_irq_handler, IRQF_SHARED,
1030 name, &pc->irq_data[i]);
1032 dev_err(dev, "unable to request IRQ %d\n", pc->irq[i]);
1037 err = gpiochip_add_data(&pc->gpio_chip, pc);
1039 dev_err(dev, "could not add GPIO chip\n");
1043 pc->pctl_dev = devm_pinctrl_register(dev, &bcm2835_pinctrl_desc, pc);
1044 if (IS_ERR(pc->pctl_dev)) {
1045 gpiochip_remove(&pc->gpio_chip);
1046 return PTR_ERR(pc->pctl_dev);
1049 pc->gpio_range = bcm2835_pinctrl_gpio_range;
1050 pc->gpio_range.base = pc->gpio_chip.base;
1051 pc->gpio_range.gc = &pc->gpio_chip;
1052 pinctrl_add_gpio_range(pc->pctl_dev, &pc->gpio_range);
1057 static int bcm2835_pinctrl_remove(struct platform_device *pdev)
1059 struct bcm2835_pinctrl *pc = platform_get_drvdata(pdev);
1061 gpiochip_remove(&pc->gpio_chip);
1066 static const struct of_device_id bcm2835_pinctrl_match[] = {
1067 { .compatible = "brcm,bcm2835-gpio" },
1070 MODULE_DEVICE_TABLE(of, bcm2835_pinctrl_match);
1072 static struct platform_driver bcm2835_pinctrl_driver = {
1073 .probe = bcm2835_pinctrl_probe,
1074 .remove = bcm2835_pinctrl_remove,
1076 .name = MODULE_NAME,
1077 .of_match_table = bcm2835_pinctrl_match,
1080 module_platform_driver(bcm2835_pinctrl_driver);
1082 MODULE_AUTHOR("Chris Boot, Simon Arlott, Stephen Warren");
1083 MODULE_DESCRIPTION("BCM2835 Pin control driver");
1084 MODULE_LICENSE("GPL");