1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * AppliedMicro X-Gene SoC GPIO-Standby Driver
19 #include "gpiolib-acpi.h"
22 #define XGENE_NIRQ_PROPERTY		"apm,nr-irqs"
23 #define XGENE_NGPIO_PROPERTY		"apm,nr-gpios"
24 #define XGENE_IRQ_START_PROPERTY	"apm,irq-start"
41  * struct xgene_gpio_sb - GPIO-Standby private data structure.
42  * @gc:				memory-mapped GPIO controllers.
58 #define HWIRQ_TO_GPIO(priv, hwirq) ((hwirq) + (priv)->irq_start)
59 #define GPIO_TO_HWIRQ(priv, gpio) ((gpio) - (priv)->irq_start)
66 	data = gc->read_reg(reg);  in xgene_gpio_set_bit()
71 	gc->write_reg(reg, data);  in xgene_gpio_set_bit()
77 	int gpio = HWIRQ_TO_GPIO(priv, d->hwirq);  in xgene_gpio_sb_irq_set_type()
93 	xgene_gpio_set_bit(&priv->gc, priv->regs + MPA_GPIO_SEL_LO,  in xgene_gpio_sb_irq_set_type()
95 	xgene_gpio_set_bit(&priv->gc, priv->regs + MPA_GPIO_INT_LVL,  in xgene_gpio_sb_irq_set_type()
96 			d->hwirq, lvl_type);  in xgene_gpio_sb_irq_set_type()
118 	if ((gpio < priv->irq_start) ||  in xgene_gpio_sb_to_irq()
119 			(gpio > HWIRQ_TO_GPIO(priv, priv->nirq)))  in xgene_gpio_sb_to_irq()
120 		return -ENXIO;  in xgene_gpio_sb_to_irq()
122 	fwspec.fwnode = gc->parent->fwnode;  in xgene_gpio_sb_to_irq()
133 	struct xgene_gpio_sb *priv = d->host_data;  in xgene_gpio_sb_domain_activate()
134 	u32 gpio = HWIRQ_TO_GPIO(priv, irq_data->hwirq);  in xgene_gpio_sb_domain_activate()
137 	ret = gpiochip_lock_as_irq(&priv->gc, gpio);  in xgene_gpio_sb_domain_activate()
139 		dev_err(priv->gc.parent,  in xgene_gpio_sb_domain_activate()
140 		"Unable to configure XGene GPIO standby pin %d as IRQ\n",  in xgene_gpio_sb_domain_activate()
145 	xgene_gpio_set_bit(&priv->gc, priv->regs + MPA_GPIO_SEL_LO,  in xgene_gpio_sb_domain_activate()
153 	struct xgene_gpio_sb *priv = d->host_data;  in xgene_gpio_sb_domain_deactivate()
154 	u32 gpio = HWIRQ_TO_GPIO(priv, irq_data->hwirq);  in xgene_gpio_sb_domain_deactivate()
156 	gpiochip_unlock_as_irq(&priv->gc, gpio);  in xgene_gpio_sb_domain_deactivate()
157 	xgene_gpio_set_bit(&priv->gc, priv->regs + MPA_GPIO_SEL_LO,  in xgene_gpio_sb_domain_deactivate()
166 	struct xgene_gpio_sb *priv = d->host_data;  in xgene_gpio_sb_domain_translate()
168 	if ((fwspec->param_count != 2) ||  in xgene_gpio_sb_domain_translate()
169 		(fwspec->param[0] >= priv->nirq))  in xgene_gpio_sb_domain_translate()
170 		return -EINVAL;  in xgene_gpio_sb_domain_translate()
171 	*hwirq = fwspec->param[0];  in xgene_gpio_sb_domain_translate()
172 	*type = fwspec->param[1];  in xgene_gpio_sb_domain_translate()
182 	struct xgene_gpio_sb *priv = domain->host_data;  in xgene_gpio_sb_domain_alloc()
186 	hwirq = fwspec->param[0];  in xgene_gpio_sb_domain_alloc()
191 	parent_fwspec.fwnode = domain->parent->fwnode;  in xgene_gpio_sb_domain_alloc()
196 		parent_fwspec.param[1] = hwirq + priv->parent_irq_base - 32;  in xgene_gpio_sb_domain_alloc()
197 		parent_fwspec.param[2] = fwspec->param[1];  in xgene_gpio_sb_domain_alloc()
200 		parent_fwspec.param[0] = hwirq + priv->parent_irq_base;  in xgene_gpio_sb_domain_alloc()
201 		parent_fwspec.param[1] = fwspec->param[1];  in xgene_gpio_sb_domain_alloc()
203 		return -EINVAL;  in xgene_gpio_sb_domain_alloc()
225 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);  in xgene_gpio_sb_probe()
227 		return -ENOMEM;  in xgene_gpio_sb_probe()
233 	priv->regs = regs;  in xgene_gpio_sb_probe()
237 		priv->parent_irq_base = irq_get_irq_data(ret)->hwirq;  in xgene_gpio_sb_probe()
238 		parent_domain = irq_get_irq_data(ret)->domain;  in xgene_gpio_sb_probe()
241 		dev_err(&pdev->dev, "unable to obtain parent domain\n");  in xgene_gpio_sb_probe()
242 		return -ENODEV;  in xgene_gpio_sb_probe()
245 	ret = bgpio_init(&priv->gc, &pdev->dev, 4,  in xgene_gpio_sb_probe()
252 	priv->gc.to_irq = xgene_gpio_sb_to_irq;  in xgene_gpio_sb_probe()
255 	priv->irq_start = XGENE_DFLT_IRQ_START_PIN;  in xgene_gpio_sb_probe()
256 	if (!device_property_read_u32(&pdev->dev,  in xgene_gpio_sb_probe()
258 		priv->irq_start = val32;  in xgene_gpio_sb_probe()
261 	priv->nirq = XGENE_DFLT_MAX_NIRQ;  in xgene_gpio_sb_probe()
262 	if (!device_property_read_u32(&pdev->dev, XGENE_NIRQ_PROPERTY, &val32))  in xgene_gpio_sb_probe()
263 		priv->nirq = val32;  in xgene_gpio_sb_probe()
266 	priv->gc.ngpio = XGENE_DFLT_MAX_NGPIO;  in xgene_gpio_sb_probe()
267 	if (!device_property_read_u32(&pdev->dev, XGENE_NGPIO_PROPERTY, &val32))  in xgene_gpio_sb_probe()
268 		priv->gc.ngpio = val32;  in xgene_gpio_sb_probe()
270 	dev_info(&pdev->dev, "Support %d gpios, %d irqs start from pin %d\n",  in xgene_gpio_sb_probe()
271 			priv->gc.ngpio, priv->nirq, priv->irq_start);  in xgene_gpio_sb_probe()
275 	priv->irq_domain = irq_domain_create_hierarchy(parent_domain,  in xgene_gpio_sb_probe()
276 					0, priv->nirq, pdev->dev.fwnode,  in xgene_gpio_sb_probe()
278 	if (!priv->irq_domain)  in xgene_gpio_sb_probe()
279 		return -ENODEV;  in xgene_gpio_sb_probe()
281 	priv->gc.irq.domain = priv->irq_domain;  in xgene_gpio_sb_probe()
283 	ret = devm_gpiochip_add_data(&pdev->dev, &priv->gc, priv);  in xgene_gpio_sb_probe()
285 		dev_err(&pdev->dev,  in xgene_gpio_sb_probe()
286 			"failed to register X-Gene GPIO Standby driver\n");  in xgene_gpio_sb_probe()
287 		irq_domain_remove(priv->irq_domain);  in xgene_gpio_sb_probe()
291 	dev_info(&pdev->dev, "X-Gene GPIO Standby driver registered\n");  in xgene_gpio_sb_probe()
294 	acpi_gpiochip_request_interrupts(&priv->gc);  in xgene_gpio_sb_probe()
303 	acpi_gpiochip_free_interrupts(&priv->gc);  in xgene_gpio_sb_remove()
305 	irq_domain_remove(priv->irq_domain);  in xgene_gpio_sb_remove()
311 	{.compatible = "apm,xgene-gpio-sb", },
326 		   .name = "xgene-gpio-sb",
336 MODULE_DESCRIPTION("APM X-Gene GPIO Standby driver");