1 // SPDX-License-Identifier: GPL-2.0
16 /* EIC registers definition */
53  * The digital-chip EIC controller can support maximum 3 banks, and each bank
59 #define SPRD_EIC_BIT(x)			((x) & (SPRD_EIC_PER_BANK_NR - 1))
63  * The Spreadtrum EIC (external interrupt controller) can be used only in
66  * The Spreadtrum digital-chip EIC controller contains 4 sub-modules:
67  * debounce EIC, latch EIC, async EIC and sync EIC,
69  * The debounce EIC is used to capture the input signals' stable status
70  * (millisecond resolution) and a single-trigger mechanism is introduced
71  * into this sub-module to enhance the input event detection reliability.
74  * The latch EIC is used to latch some special power down signals and
75  * generate interrupts, since the latch EIC does not depend on the APB clock
78  * The async EIC uses a 32k clock to capture the short signals (microsecond
81  * The EIC-sync is similar with GPIO's input function, which is a synchronized
107 	"eic-debounce", "eic-latch", "eic-async",
108 	"eic-sync",
137 	return sprd_eic->base[bank];  in sprd_eic_offset_base()
149 	spin_lock_irqsave(&sprd_eic->lock, flags);  in sprd_eic_update()
158 	spin_unlock_irqrestore(&sprd_eic->lock, flags);  in sprd_eic_update()
185 	switch (sprd_eic->type) {  in sprd_eic_get()
193 		return -ENOTSUPP;  in sprd_eic_get()
232 	return -ENOTSUPP;  in sprd_eic_set_config()
241 	switch (sprd_eic->type) {  in sprd_eic_irq_mask()
256 		dev_err(chip->parent, "Unsupported EIC type.\n");  in sprd_eic_irq_mask()
266 	switch (sprd_eic->type) {  in sprd_eic_irq_unmask()
281 		dev_err(chip->parent, "Unsupported EIC type.\n");  in sprd_eic_irq_unmask()
291 	switch (sprd_eic->type) {  in sprd_eic_irq_ack()
305 		dev_err(chip->parent, "Unsupported EIC type.\n");  in sprd_eic_irq_ack()
316 	switch (sprd_eic->type) {  in sprd_eic_irq_set_type()
344 			return -ENOTSUPP;  in sprd_eic_irq_set_type()
376 			return -ENOTSUPP;  in sprd_eic_irq_set_type()
418 			return -ENOTSUPP;  in sprd_eic_irq_set_type()
458 			return -ENOTSUPP;  in sprd_eic_irq_set_type()
462 		dev_err(chip->parent, "Unsupported EIC type.\n");  in sprd_eic_irq_set_type()
463 		return -ENOTSUPP;  in sprd_eic_irq_set_type()
478 	 * The debounce EIC and latch EIC can only support level trigger, so we  in sprd_eic_toggle_trigger()
481 	if ((sprd_eic->type != SPRD_EIC_DEBOUNCE &&  in sprd_eic_toggle_trigger()
482 	     sprd_eic->type != SPRD_EIC_LATCH) ||  in sprd_eic_toggle_trigger()
490 	switch (sprd_eic->type) {  in sprd_eic_toggle_trigger()
510 		dev_warn(chip->parent, "EIC level was changed.\n");  in sprd_eic_toggle_trigger()
522 	return !strcmp(chip->label, sprd_eic_label_name[type]);  in sprd_eic_match_chip_by_type()
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()
576 	 * Since the digital-chip EIC 4 sub-modules (debounce, latch, async  in sprd_eic_irq_handler()
578 	 * EIC module to check if there are EIC interrupts were triggered.  in sprd_eic_irq_handler()
599 	pdata = of_device_get_match_data(&pdev->dev);  in sprd_eic_probe()
601 		dev_err(&pdev->dev, "No matching driver data found.\n");  in sprd_eic_probe()
602 		return -EINVAL;  in sprd_eic_probe()
605 	sprd_eic = devm_kzalloc(&pdev->dev, sizeof(*sprd_eic), GFP_KERNEL);  in sprd_eic_probe()
607 		return -ENOMEM;  in sprd_eic_probe()
609 	spin_lock_init(&sprd_eic->lock);  in sprd_eic_probe()
610 	sprd_eic->type = pdata->type;  in sprd_eic_probe()
612 	sprd_eic->irq = platform_get_irq(pdev, 0);  in sprd_eic_probe()
613 	if (sprd_eic->irq < 0)  in sprd_eic_probe()
614 		return sprd_eic->irq;  in sprd_eic_probe()
618 		 * We can have maximum 3 banks EICs, and each EIC has  in sprd_eic_probe()
620 		 * have one bank EIC, thus base[1] and base[2] can be  in sprd_eic_probe()
627 		sprd_eic->base[i] = devm_ioremap_resource(&pdev->dev, res);  in sprd_eic_probe()
628 		if (IS_ERR(sprd_eic->base[i]))  in sprd_eic_probe()
629 			return PTR_ERR(sprd_eic->base[i]);  in sprd_eic_probe()
632 	sprd_eic->chip.label = sprd_eic_label_name[sprd_eic->type];  in sprd_eic_probe()
633 	sprd_eic->chip.ngpio = pdata->num_eics;  in sprd_eic_probe()
634 	sprd_eic->chip.base = -1;  in sprd_eic_probe()
635 	sprd_eic->chip.parent = &pdev->dev;  in sprd_eic_probe()
636 	sprd_eic->chip.of_node = pdev->dev.of_node;  in sprd_eic_probe()
637 	sprd_eic->chip.direction_input = sprd_eic_direction_input;  in sprd_eic_probe()
638 	switch (sprd_eic->type) {  in sprd_eic_probe()
640 		sprd_eic->chip.request = sprd_eic_request;  in sprd_eic_probe()
641 		sprd_eic->chip.free = sprd_eic_free;  in sprd_eic_probe()
642 		sprd_eic->chip.set_config = sprd_eic_set_config;  in sprd_eic_probe()
643 		sprd_eic->chip.set = sprd_eic_set;  in sprd_eic_probe()
647 		sprd_eic->chip.get = sprd_eic_get;  in sprd_eic_probe()
654 	sprd_eic->intc.name = dev_name(&pdev->dev);  in sprd_eic_probe()
655 	sprd_eic->intc.irq_ack = sprd_eic_irq_ack;  in sprd_eic_probe()
656 	sprd_eic->intc.irq_mask = sprd_eic_irq_mask;  in sprd_eic_probe()
657 	sprd_eic->intc.irq_unmask = sprd_eic_irq_unmask;  in sprd_eic_probe()
658 	sprd_eic->intc.irq_set_type = sprd_eic_irq_set_type;  in sprd_eic_probe()
659 	sprd_eic->intc.flags = IRQCHIP_SKIP_SET_WAKE;  in sprd_eic_probe()
661 	irq = &sprd_eic->chip.irq;  in sprd_eic_probe()
662 	irq->chip = &sprd_eic->intc;  in sprd_eic_probe()
663 	irq->handler = handle_bad_irq;  in sprd_eic_probe()
664 	irq->default_type = IRQ_TYPE_NONE;  in sprd_eic_probe()
665 	irq->parent_handler = sprd_eic_irq_handler;  in sprd_eic_probe()
666 	irq->parent_handler_data = sprd_eic;  in sprd_eic_probe()
667 	irq->num_parents = 1;  in sprd_eic_probe()
668 	irq->parents = &sprd_eic->irq;  in sprd_eic_probe()
670 	ret = devm_gpiochip_add_data(&pdev->dev, &sprd_eic->chip, sprd_eic);  in sprd_eic_probe()
672 		dev_err(&pdev->dev, "Could not register gpiochip %d.\n", ret);  in sprd_eic_probe()
682 		.compatible = "sprd,sc9860-eic-debounce",
686 		.compatible = "sprd,sc9860-eic-latch",
690 		.compatible = "sprd,sc9860-eic-async",
694 		.compatible = "sprd,sc9860-eic-sync",
706 		.name = "sprd-eic",
713 MODULE_DESCRIPTION("Spreadtrum EIC driver");