1 // SPDX-License-Identifier: GPL-2.0
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))
64  * input mode to generate interrupts if detecting input signals.
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.
72  * The debounce range is from 1ms to 4s with a step size of 1ms.
81  * The EIC-sync is similar with GPIO's input function, which is a synchronized
82  * signal input register.
106 	"eic-debounce", "eic-latch", "eic-async",
107 	"eic-sync",
136 	return sprd_eic->base[bank];  in sprd_eic_offset_base()
148 	spin_lock_irqsave(&sprd_eic->lock, flags);  in sprd_eic_update()
157 	spin_unlock_irqrestore(&sprd_eic->lock, flags);  in sprd_eic_update()
184 	switch (sprd_eic->type) {  in sprd_eic_get()
192 		return -ENOTSUPP;  in sprd_eic_get()
198 	/* EICs are always input, nothing need to do here. */  in sprd_eic_direction_input()
204 	/* EICs are always input, nothing need to do here. */  in sprd_eic_set()
208 				 unsigned int debounce)  in sprd_eic_set_debounce()  argument
216 	value |= (debounce / 1000) & SPRD_EIC_DBNC_MASK;  in sprd_eic_set_debounce()
231 	return -ENOTSUPP;  in sprd_eic_set_config()
240 	switch (sprd_eic->type) {  in sprd_eic_irq_mask()
255 		dev_err(chip->parent, "Unsupported EIC type.\n");  in sprd_eic_irq_mask()
269 	switch (sprd_eic->type) {  in sprd_eic_irq_unmask()
284 		dev_err(chip->parent, "Unsupported EIC type.\n");  in sprd_eic_irq_unmask()
294 	switch (sprd_eic->type) {  in sprd_eic_irq_ack()
308 		dev_err(chip->parent, "Unsupported EIC type.\n");  in sprd_eic_irq_ack()
319 	switch (sprd_eic->type) {  in sprd_eic_irq_set_type()
340 			return -ENOTSUPP;  in sprd_eic_irq_set_type()
365 			return -ENOTSUPP;  in sprd_eic_irq_set_type()
402 			return -ENOTSUPP;  in sprd_eic_irq_set_type()
437 			return -ENOTSUPP;  in sprd_eic_irq_set_type()
441 		dev_err(chip->parent, "Unsupported EIC type.\n");  in sprd_eic_irq_set_type()
442 		return -ENOTSUPP;  in sprd_eic_irq_set_type()
457 	 * The debounce EIC and latch EIC can only support level trigger, so we  in sprd_eic_toggle_trigger()
460 	if ((sprd_eic->type != SPRD_EIC_DEBOUNCE &&  in sprd_eic_toggle_trigger()
461 	     sprd_eic->type != SPRD_EIC_LATCH) ||  in sprd_eic_toggle_trigger()
469 	switch (sprd_eic->type) {  in sprd_eic_toggle_trigger()
489 		dev_warn(chip->parent, "EIC level was changed.\n");  in sprd_eic_toggle_trigger()
501 	return !strcmp(chip->label, sprd_eic_label_name[type]);  in sprd_eic_match_chip_by_type()
509 	for (bank = 0; bank * SPRD_EIC_PER_BANK_NR < chip->ngpio; bank++) {  in sprd_eic_handle_one_type()
513 		switch (sprd_eic->type) {  in sprd_eic_handle_one_type()
531 			dev_err(chip->parent, "Unsupported EIC type.\n");  in sprd_eic_handle_one_type()
538 			girq = irq_find_mapping(chip->irq.domain, offset);  in sprd_eic_handle_one_type()
555 	 * Since the digital-chip EIC 4 sub-modules (debounce, latch, async  in sprd_eic_irq_handler()
571 	.name		= "sprd-eic",
587 	pdata = of_device_get_match_data(&pdev->dev);  in sprd_eic_probe()
589 		dev_err(&pdev->dev, "No matching driver data found.\n");  in sprd_eic_probe()
590 		return -EINVAL;  in sprd_eic_probe()
593 	sprd_eic = devm_kzalloc(&pdev->dev, sizeof(*sprd_eic), GFP_KERNEL);  in sprd_eic_probe()
595 		return -ENOMEM;  in sprd_eic_probe()
597 	spin_lock_init(&sprd_eic->lock);  in sprd_eic_probe()
598 	sprd_eic->type = pdata->type;  in sprd_eic_probe()
600 	sprd_eic->irq = platform_get_irq(pdev, 0);  in sprd_eic_probe()
601 	if (sprd_eic->irq < 0)  in sprd_eic_probe()
602 		return sprd_eic->irq;  in sprd_eic_probe()
615 		sprd_eic->base[i] = devm_ioremap_resource(&pdev->dev, res);  in sprd_eic_probe()
616 		if (IS_ERR(sprd_eic->base[i]))  in sprd_eic_probe()
617 			return PTR_ERR(sprd_eic->base[i]);  in sprd_eic_probe()
620 	sprd_eic->chip.label = sprd_eic_label_name[sprd_eic->type];  in sprd_eic_probe()
621 	sprd_eic->chip.ngpio = pdata->num_eics;  in sprd_eic_probe()
622 	sprd_eic->chip.base = -1;  in sprd_eic_probe()
623 	sprd_eic->chip.parent = &pdev->dev;  in sprd_eic_probe()
624 	sprd_eic->chip.direction_input = sprd_eic_direction_input;  in sprd_eic_probe()
625 	switch (sprd_eic->type) {  in sprd_eic_probe()
627 		sprd_eic->chip.request = sprd_eic_request;  in sprd_eic_probe()
628 		sprd_eic->chip.free = sprd_eic_free;  in sprd_eic_probe()
629 		sprd_eic->chip.set_config = sprd_eic_set_config;  in sprd_eic_probe()
630 		sprd_eic->chip.set = sprd_eic_set;  in sprd_eic_probe()
634 		sprd_eic->chip.get = sprd_eic_get;  in sprd_eic_probe()
641 	irq = &sprd_eic->chip.irq;  in sprd_eic_probe()
643 	irq->handler = handle_bad_irq;  in sprd_eic_probe()
644 	irq->default_type = IRQ_TYPE_NONE;  in sprd_eic_probe()
645 	irq->parent_handler = sprd_eic_irq_handler;  in sprd_eic_probe()
646 	irq->parent_handler_data = sprd_eic;  in sprd_eic_probe()
647 	irq->num_parents = 1;  in sprd_eic_probe()
648 	irq->parents = &sprd_eic->irq;  in sprd_eic_probe()
650 	ret = devm_gpiochip_add_data(&pdev->dev, &sprd_eic->chip, sprd_eic);  in sprd_eic_probe()
652 		dev_err(&pdev->dev, "Could not register gpiochip %d.\n", ret);  in sprd_eic_probe()
661 		.compatible = "sprd,sc9860-eic-debounce",
665 		.compatible = "sprd,sc9860-eic-latch",
669 		.compatible = "sprd,sc9860-eic-async",
673 		.compatible = "sprd,sc9860-eic-sync",
685 		.name = "sprd-eic",