1 // SPDX-License-Identifier: GPL-2.0
8 #include <linux/gpio/driver.h>
54  * The digital-chip EIC controller can support maximum 3 banks, and each bank
60 #define SPRD_EIC_BIT(x)			((x) & (SPRD_EIC_PER_BANK_NR - 1))
67  * The Spreadtrum digital-chip EIC controller contains 4 sub-modules:
68  * debounce EIC, latch EIC, async EIC and sync EIC,
71  * (millisecond resolution) and a single-trigger mechanism is introduced
72  * into this sub-module to enhance the input event detection reliability.
75  * The latch EIC is used to latch some special power down signals and
76  * generate interrupts, since the latch EIC does not depend on the APB clock
82  * The EIC-sync is similar with GPIO's input function, which is a synchronized
114 	"eic-debounce", "eic-latch", "eic-async",
115 	"eic-sync",
140 	return sprd_eic->base[bank];  in sprd_eic_offset_base()
152 	spin_lock_irqsave(&sprd_eic->lock, flags);  in sprd_eic_update()
161 	spin_unlock_irqrestore(&sprd_eic->lock, flags);  in sprd_eic_update()
188 	switch (sprd_eic->type) {  in sprd_eic_get()
196 		return -ENOTSUPP;  in sprd_eic_get()
235 	return -ENOTSUPP;  in sprd_eic_set_config()
244 	switch (sprd_eic->type) {  in sprd_eic_irq_mask()
259 		dev_err(chip->parent, "Unsupported EIC type.\n");  in sprd_eic_irq_mask()
273 	switch (sprd_eic->type) {  in sprd_eic_irq_unmask()
288 		dev_err(chip->parent, "Unsupported EIC type.\n");  in sprd_eic_irq_unmask()
298 	switch (sprd_eic->type) {  in sprd_eic_irq_ack()
312 		dev_err(chip->parent, "Unsupported EIC type.\n");  in sprd_eic_irq_ack()
323 	switch (sprd_eic->type) {  in sprd_eic_irq_set_type()
351 			return -ENOTSUPP;  in sprd_eic_irq_set_type()
383 			return -ENOTSUPP;  in sprd_eic_irq_set_type()
425 			return -ENOTSUPP;  in sprd_eic_irq_set_type()
465 			return -ENOTSUPP;  in sprd_eic_irq_set_type()
469 		dev_err(chip->parent, "Unsupported EIC type.\n");  in sprd_eic_irq_set_type()
470 		return -ENOTSUPP;  in sprd_eic_irq_set_type()
485 	 * The debounce EIC and latch EIC can only support level trigger, so we  in sprd_eic_toggle_trigger()
488 	if ((sprd_eic->type != SPRD_EIC_DEBOUNCE &&  in sprd_eic_toggle_trigger()
489 	     sprd_eic->type != SPRD_EIC_LATCH) ||  in sprd_eic_toggle_trigger()
497 	switch (sprd_eic->type) {  in sprd_eic_toggle_trigger()
517 		dev_warn(chip->parent, "EIC level was changed.\n");  in sprd_eic_toggle_trigger()
530 	for (bank = 0; bank * SPRD_EIC_PER_BANK_NR < chip->ngpio; bank++) {  in sprd_eic_handle_one_type()
534 		switch (sprd_eic->type) {  in sprd_eic_handle_one_type()
552 			dev_err(chip->parent, "Unsupported EIC type.\n");  in sprd_eic_handle_one_type()
559 			girq = irq_find_mapping(chip->irq.domain, offset);  in sprd_eic_handle_one_type()
574 	 * Since the digital-chip EIC 4 sub-modules (debounce, latch, async  in sprd_eic_irq_handler()
588 	sprd_eic_handle_one_type(&sprd_eic->chip);  in sprd_eic_irq_notify()
594 	.name		= "sprd-eic",
613 	struct device *dev = &pdev->dev;  in sprd_eic_probe()
623 		return -EINVAL;  in sprd_eic_probe()
628 		return -ENOMEM;  in sprd_eic_probe()
630 	spin_lock_init(&sprd_eic->lock);  in sprd_eic_probe()
631 	sprd_eic->type = pdata->type;  in sprd_eic_probe()
633 	sprd_eic->irq = platform_get_irq(pdev, 0);  in sprd_eic_probe()
634 	if (sprd_eic->irq < 0)  in sprd_eic_probe()
635 		return sprd_eic->irq;  in sprd_eic_probe()
648 		sprd_eic->base[i] = devm_ioremap_resource(dev, res);  in sprd_eic_probe()
649 		if (IS_ERR(sprd_eic->base[i]))  in sprd_eic_probe()
650 			return PTR_ERR(sprd_eic->base[i]);  in sprd_eic_probe()
655 	sprd_eic->chip.label = sprd_eic_label_name[sprd_eic->type];  in sprd_eic_probe()
656 	sprd_eic->chip.ngpio = num_banks * SPRD_EIC_PER_BANK_NR;  in sprd_eic_probe()
657 	sprd_eic->chip.base = -1;  in sprd_eic_probe()
658 	sprd_eic->chip.parent = dev;  in sprd_eic_probe()
659 	sprd_eic->chip.direction_input = sprd_eic_direction_input;  in sprd_eic_probe()
660 	switch (sprd_eic->type) {  in sprd_eic_probe()
662 		sprd_eic->chip.request = sprd_eic_request;  in sprd_eic_probe()
663 		sprd_eic->chip.free = sprd_eic_free;  in sprd_eic_probe()
664 		sprd_eic->chip.set_config = sprd_eic_set_config;  in sprd_eic_probe()
665 		sprd_eic->chip.set = sprd_eic_set;  in sprd_eic_probe()
669 		sprd_eic->chip.get = sprd_eic_get;  in sprd_eic_probe()
676 	irq = &sprd_eic->chip.irq;  in sprd_eic_probe()
678 	irq->handler = handle_bad_irq;  in sprd_eic_probe()
679 	irq->default_type = IRQ_TYPE_NONE;  in sprd_eic_probe()
680 	irq->parent_handler = sprd_eic_irq_handler;  in sprd_eic_probe()
681 	irq->parent_handler_data = sprd_eic;  in sprd_eic_probe()
682 	irq->num_parents = 1;  in sprd_eic_probe()
683 	irq->parents = &sprd_eic->irq;  in sprd_eic_probe()
685 	ret = devm_gpiochip_add_data(dev, &sprd_eic->chip, sprd_eic);  in sprd_eic_probe()
691 	sprd_eic->irq_nb.notifier_call = sprd_eic_irq_notify;  in sprd_eic_probe()
693 					     &sprd_eic->irq_nb);  in sprd_eic_probe()
699 					&sprd_eic->irq_nb);  in sprd_eic_probe()
704 		.compatible = "sprd,sc9860-eic-debounce",
708 		.compatible = "sprd,sc9860-eic-latch",
712 		.compatible = "sprd,sc9860-eic-async",
716 		.compatible = "sprd,sc9860-eic-sync",
728 		.name = "sprd-eic",