1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * wm831x-irq.c  --  Interrupt controller support for Wolfson WM831x PMICs
13 #include <linux/irq.h>
21 #include <linux/mfd/wm831x/irq.h>
321 	return WM831X_INTERRUPT_STATUS_1 - 1 + irq_data->reg;  in irq_data_to_status_reg()
325 							int irq)  in irq_to_wm831x_irq()  argument
327 	return &wm831x_irqs[irq];  in irq_to_wm831x_irq()
334 	mutex_lock(&wm831x->irq_lock);  in wm831x_irq_lock()
342 	for (i = 0; i < ARRAY_SIZE(wm831x->gpio_update); i++) {  in wm831x_irq_sync_unlock()
343 		if (wm831x->gpio_update[i]) {  in wm831x_irq_sync_unlock()
346 					wm831x->gpio_update[i]);  in wm831x_irq_sync_unlock()
347 			wm831x->gpio_update[i] = 0;  in wm831x_irq_sync_unlock()
351 	for (i = 0; i < ARRAY_SIZE(wm831x->irq_masks_cur); i++) {  in wm831x_irq_sync_unlock()
354 		if (wm831x->irq_masks_cur[i] != wm831x->irq_masks_cache[i]) {  in wm831x_irq_sync_unlock()
355 			dev_dbg(wm831x->dev, "IRQ mask sync: %x = %x\n",  in wm831x_irq_sync_unlock()
357 				wm831x->irq_masks_cur[i]);  in wm831x_irq_sync_unlock()
359 			wm831x->irq_masks_cache[i] = wm831x->irq_masks_cur[i];  in wm831x_irq_sync_unlock()
362 					 wm831x->irq_masks_cur[i]);  in wm831x_irq_sync_unlock()
366 	mutex_unlock(&wm831x->irq_lock);  in wm831x_irq_sync_unlock()
373 							     data->hwirq);  in wm831x_irq_enable()
375 	wm831x->irq_masks_cur[irq_data->reg - 1] &= ~irq_data->mask;  in wm831x_irq_enable()
382 							     data->hwirq);  in wm831x_irq_disable()
384 	wm831x->irq_masks_cur[irq_data->reg - 1] |= irq_data->mask;  in wm831x_irq_disable()
390 	int irq;  in wm831x_irq_set_type()  local
392 	irq = data->hwirq;  in wm831x_irq_set_type()
394 	if (irq < WM831X_IRQ_GPIO_1 || irq > WM831X_IRQ_GPIO_11) {  in wm831x_irq_set_type()
395 		/* Ignore internal-only IRQs */  in wm831x_irq_set_type()
396 		if (irq >= 0 && irq < WM831X_NUM_IRQS)  in wm831x_irq_set_type()
399 			return -EINVAL;  in wm831x_irq_set_type()
402 	/* Rebase the IRQ into the GPIO range so we've got a sensible array  in wm831x_irq_set_type()
405 	irq -= WM831X_IRQ_GPIO_1;  in wm831x_irq_set_type()
408 	 * do the update here as we can be called with the bus lock  in wm831x_irq_set_type()
411 	wm831x->gpio_level_low[irq] = false;  in wm831x_irq_set_type()
412 	wm831x->gpio_level_high[irq] = false;  in wm831x_irq_set_type()
415 		wm831x->gpio_update[irq] = 0x10000 | WM831X_GPN_INT_MODE;  in wm831x_irq_set_type()
418 		wm831x->gpio_update[irq] = 0x10000 | WM831X_GPN_POL;  in wm831x_irq_set_type()
421 		wm831x->gpio_update[irq] = 0x10000;  in wm831x_irq_set_type()
424 		wm831x->gpio_update[irq] = 0x10000 | WM831X_GPN_POL;  in wm831x_irq_set_type()
425 		wm831x->gpio_level_high[irq] = true;  in wm831x_irq_set_type()
428 		wm831x->gpio_update[irq] = 0x10000;  in wm831x_irq_set_type()
429 		wm831x->gpio_level_low[irq] = true;  in wm831x_irq_set_type()
432 		return -EINVAL;  in wm831x_irq_set_type()
448  * we can interact with the device over I2C or SPI. */
449 static irqreturn_t wm831x_irq_thread(int irq, void *data)  in wm831x_irq_thread()  argument
460 		dev_err(wm831x->dev, "Failed to read system interrupt: %d\n",  in wm831x_irq_thread()
467 	 * main handling loop and so we can also skip iterating the  in wm831x_irq_thread()
471 		handle_nested_irq(irq_find_mapping(wm831x->irq_domain,  in wm831x_irq_thread()
474 		handle_nested_irq(irq_find_mapping(wm831x->irq_domain,  in wm831x_irq_thread()
479 		int offset = wm831x_irqs[i].reg - 1;  in wm831x_irq_thread()
493 				dev_err(wm831x->dev,  in wm831x_irq_thread()
494 					"Failed to read IRQ status: %d\n",  in wm831x_irq_thread()
502 			*status &= ~wm831x->irq_masks_cur[offset];  in wm831x_irq_thread()
511 			handle_nested_irq(irq_find_mapping(wm831x->irq_domain,  in wm831x_irq_thread()
514 		/* Simulate an edge triggered IRQ by polling the input  in wm831x_irq_thread()
518 		    wm831x->gpio_level_high[i - WM831X_IRQ_GPIO_1]) {  in wm831x_irq_thread()
520 			while (ret & 1 << (i - WM831X_IRQ_GPIO_1)) {  in wm831x_irq_thread()
521 				handle_nested_irq(irq_find_mapping(wm831x->irq_domain,  in wm831x_irq_thread()
529 		    wm831x->gpio_level_low[i - WM831X_IRQ_GPIO_1]) {  in wm831x_irq_thread()
531 			while (!(ret & 1 << (i - WM831X_IRQ_GPIO_1))) {  in wm831x_irq_thread()
532 				handle_nested_irq(irq_find_mapping(wm831x->irq_domain,  in wm831x_irq_thread()
547 	irq_set_chip_data(virq, h->host_data);  in wm831x_irq_map()
560 int wm831x_irq_init(struct wm831x *wm831x, int irq)  in wm831x_irq_init()  argument
562 	struct wm831x_pdata *pdata = &wm831x->pdata;  in wm831x_irq_init()
566 	mutex_init(&wm831x->irq_lock);  in wm831x_irq_init()
569 	for (i = 0; i < ARRAY_SIZE(wm831x->irq_masks_cur); i++) {  in wm831x_irq_init()
570 		wm831x->irq_masks_cur[i] = 0xffff;  in wm831x_irq_init()
571 		wm831x->irq_masks_cache[i] = 0xffff;  in wm831x_irq_init()
577 	if (pdata->irq_base) {  in wm831x_irq_init()
578 		irq_base = irq_alloc_descs(pdata->irq_base, 0,  in wm831x_irq_init()
581 			dev_warn(wm831x->dev, "Failed to allocate IRQs: %d\n",  in wm831x_irq_init()
590 		domain = irq_domain_add_legacy(wm831x->dev->of_node,  in wm831x_irq_init()
596 		domain = irq_domain_add_linear(wm831x->dev->of_node,  in wm831x_irq_init()
602 		dev_warn(wm831x->dev, "Failed to allocate IRQ domain\n");  in wm831x_irq_init()
603 		return -EINVAL;  in wm831x_irq_init()
606 	if (pdata->irq_cmos)  in wm831x_irq_init()
614 	wm831x->irq = irq;  in wm831x_irq_init()
615 	wm831x->irq_domain = domain;  in wm831x_irq_init()
617 	if (irq) {  in wm831x_irq_init()
618 		/* Try to flag /IRQ as a wake source; there are a number of  in wm831x_irq_init()
619 		 * unconditional wake sources in the PMIC so this isn't  in wm831x_irq_init()
623 		ret = enable_irq_wake(irq);  in wm831x_irq_init()
625 			dev_warn(wm831x->dev,  in wm831x_irq_init()
626 				 "Can't enable IRQ as wake source: %d\n",  in wm831x_irq_init()
630 		ret = request_threaded_irq(irq, NULL, wm831x_irq_thread,  in wm831x_irq_init()
634 			dev_err(wm831x->dev, "Failed to request IRQ %d: %d\n",  in wm831x_irq_init()
635 				irq, ret);  in wm831x_irq_init()
639 		dev_warn(wm831x->dev,  in wm831x_irq_init()
640 			 "No interrupt specified - functionality limited\n");  in wm831x_irq_init()
651 	if (wm831x->irq)  in wm831x_irq_exit()
652 		free_irq(wm831x->irq, wm831x);  in wm831x_irq_exit()