1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * AppliedMicro X-Gene SoC GPIO-Standby Driver
25 #include "gpiolib-acpi.h"
30 #define GPIO_MASK(x)			(1U << ((x) % 32))  argument
42  * struct xgene_gpio_sb - GPIO-Standby private data structure.
43  * @gc:				memory-mapped GPIO controllers.
59 #define HWIRQ_TO_GPIO(priv, hwirq) ((hwirq) + (priv)->irq_start)
60 #define GPIO_TO_HWIRQ(priv, gpio) ((gpio) - (priv)->irq_start)
67 	data = gc->read_reg(reg);  in xgene_gpio_set_bit()
72 	gc->write_reg(reg, data);  in xgene_gpio_set_bit()
78 	int gpio = HWIRQ_TO_GPIO(priv, d->hwirq);  in xgene_gpio_sb_irq_set_type()
94 	xgene_gpio_set_bit(&priv->gc, priv->regs + MPA_GPIO_SEL_LO,  in xgene_gpio_sb_irq_set_type()
96 	xgene_gpio_set_bit(&priv->gc, priv->regs + MPA_GPIO_INT_LVL,  in xgene_gpio_sb_irq_set_type()
97 			d->hwirq, lvl_type);  in xgene_gpio_sb_irq_set_type()
112 	gpiochip_disable_irq(&priv->gc, d->hwirq);  in xgene_gpio_sb_irq_mask()
119 	gpiochip_enable_irq(&priv->gc, d->hwirq);  in xgene_gpio_sb_irq_unmask()
139 	if ((gpio < priv->irq_start) ||  in xgene_gpio_sb_to_irq()
140 			(gpio > HWIRQ_TO_GPIO(priv, priv->nirq)))  in xgene_gpio_sb_to_irq()
141 		return -ENXIO;  in xgene_gpio_sb_to_irq()
143 	fwspec.fwnode = gc->parent->fwnode;  in xgene_gpio_sb_to_irq()
154 	struct xgene_gpio_sb *priv = d->host_data;  in xgene_gpio_sb_domain_activate()
155 	u32 gpio = HWIRQ_TO_GPIO(priv, irq_data->hwirq);  in xgene_gpio_sb_domain_activate()
158 	ret = gpiochip_lock_as_irq(&priv->gc, gpio);  in xgene_gpio_sb_domain_activate()
160 		dev_err(priv->gc.parent,  in xgene_gpio_sb_domain_activate()
166 	xgene_gpio_set_bit(&priv->gc, priv->regs + MPA_GPIO_SEL_LO,  in xgene_gpio_sb_domain_activate()
174 	struct xgene_gpio_sb *priv = d->host_data;  in xgene_gpio_sb_domain_deactivate()
175 	u32 gpio = HWIRQ_TO_GPIO(priv, irq_data->hwirq);  in xgene_gpio_sb_domain_deactivate()
177 	gpiochip_unlock_as_irq(&priv->gc, gpio);  in xgene_gpio_sb_domain_deactivate()
178 	xgene_gpio_set_bit(&priv->gc, priv->regs + MPA_GPIO_SEL_LO,  in xgene_gpio_sb_domain_deactivate()
187 	struct xgene_gpio_sb *priv = d->host_data;  in xgene_gpio_sb_domain_translate()
189 	if ((fwspec->param_count != 2) ||  in xgene_gpio_sb_domain_translate()
190 		(fwspec->param[0] >= priv->nirq))  in xgene_gpio_sb_domain_translate()
191 		return -EINVAL;  in xgene_gpio_sb_domain_translate()
192 	*hwirq = fwspec->param[0];  in xgene_gpio_sb_domain_translate()
193 	*type = fwspec->param[1];  in xgene_gpio_sb_domain_translate()
203 	struct xgene_gpio_sb *priv = domain->host_data;  in xgene_gpio_sb_domain_alloc()
207 	hwirq = fwspec->param[0];  in xgene_gpio_sb_domain_alloc()
212 	parent_fwspec.fwnode = domain->parent->fwnode;  in xgene_gpio_sb_domain_alloc()
217 		parent_fwspec.param[1] = hwirq + priv->parent_irq_base - 32;  in xgene_gpio_sb_domain_alloc()
218 		parent_fwspec.param[2] = fwspec->param[1];  in xgene_gpio_sb_domain_alloc()
221 		parent_fwspec.param[0] = hwirq + priv->parent_irq_base;  in xgene_gpio_sb_domain_alloc()
222 		parent_fwspec.param[1] = fwspec->param[1];  in xgene_gpio_sb_domain_alloc()
224 		return -EINVAL;  in xgene_gpio_sb_domain_alloc()
246 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);  in xgene_gpio_sb_probe()
248 		return -ENOMEM;  in xgene_gpio_sb_probe()
254 	priv->regs = regs;  in xgene_gpio_sb_probe()
258 		priv->parent_irq_base = irq_get_irq_data(ret)->hwirq;  in xgene_gpio_sb_probe()
259 		parent_domain = irq_get_irq_data(ret)->domain;  in xgene_gpio_sb_probe()
262 		dev_err(&pdev->dev, "unable to obtain parent domain\n");  in xgene_gpio_sb_probe()
263 		return -ENODEV;  in xgene_gpio_sb_probe()
266 	ret = bgpio_init(&priv->gc, &pdev->dev, 4,  in xgene_gpio_sb_probe()
273 	priv->gc.to_irq = xgene_gpio_sb_to_irq;  in xgene_gpio_sb_probe()
276 	priv->irq_start = XGENE_DFLT_IRQ_START_PIN;  in xgene_gpio_sb_probe()
277 	if (!device_property_read_u32(&pdev->dev, "apm,irq-start", &val32))  in xgene_gpio_sb_probe()
278 		priv->irq_start = val32;  in xgene_gpio_sb_probe()
281 	priv->nirq = XGENE_DFLT_MAX_NIRQ;  in xgene_gpio_sb_probe()
282 	if (!device_property_read_u32(&pdev->dev, "apm,nr-irqs", &val32))  in xgene_gpio_sb_probe()
283 		priv->nirq = val32;  in xgene_gpio_sb_probe()
286 	priv->gc.ngpio = XGENE_DFLT_MAX_NGPIO;  in xgene_gpio_sb_probe()
287 	if (!device_property_read_u32(&pdev->dev, "apm,nr-gpios", &val32))  in xgene_gpio_sb_probe()
288 		priv->gc.ngpio = val32;  in xgene_gpio_sb_probe()
290 	dev_info(&pdev->dev, "Support %d gpios, %d irqs start from pin %d\n",  in xgene_gpio_sb_probe()
291 			priv->gc.ngpio, priv->nirq, priv->irq_start);  in xgene_gpio_sb_probe()
295 	priv->irq_domain = irq_domain_create_hierarchy(parent_domain,  in xgene_gpio_sb_probe()
296 					0, priv->nirq, pdev->dev.fwnode,  in xgene_gpio_sb_probe()
298 	if (!priv->irq_domain)  in xgene_gpio_sb_probe()
299 		return -ENODEV;  in xgene_gpio_sb_probe()
301 	priv->gc.irq.domain = priv->irq_domain;  in xgene_gpio_sb_probe()
303 	ret = devm_gpiochip_add_data(&pdev->dev, &priv->gc, priv);  in xgene_gpio_sb_probe()
305 		dev_err(&pdev->dev,  in xgene_gpio_sb_probe()
306 			"failed to register X-Gene GPIO Standby driver\n");  in xgene_gpio_sb_probe()
307 		irq_domain_remove(priv->irq_domain);  in xgene_gpio_sb_probe()
311 	dev_info(&pdev->dev, "X-Gene GPIO Standby driver registered\n");  in xgene_gpio_sb_probe()
314 	acpi_gpiochip_request_interrupts(&priv->gc);  in xgene_gpio_sb_probe()
323 	acpi_gpiochip_free_interrupts(&priv->gc);  in xgene_gpio_sb_remove()
325 	irq_domain_remove(priv->irq_domain);  in xgene_gpio_sb_remove()
329 	{ .compatible = "apm,xgene-gpio-sb" },
342 		   .name = "xgene-gpio-sb",
352 MODULE_DESCRIPTION("APM X-Gene GPIO Standby driver");