1 // SPDX-License-Identifier: GPL-2.0-only
3  * GPIO controller in LSI ZEVIO SoCs.
5  * Author: Fabian Vogt <fabian@ritter-vogt.de>
18 #include <linux/gpio/driver.h>
22  * This chip has four gpio sections, each controls 8 GPIOs.
23  * Bit 0 in section 0 is GPIO 0, bit 2 in section 1 is GPIO 10.
26 …tp://hackspire.unsads.com/wiki/index.php/Memory-mapped_I/O_ports#90000000_-_General_Purpose_I.2FO_…
28  * 0x00-0x3F: Section 0
29  *     +0x00: Masked interrupt status (read-only)
32  *     +0x0C: W: Unmask interrupt (write-only)
35  *     +0x18: Input (read-only)
37  * 0x40-0x7F: Section 1
38  * 0x80-0xBF: Section 2
39  * 0xC0-0xFF: Section 3
54 /* Bit number of GPIO in its section */
55 #define ZEVIO_GPIO_BIT(gpio) (gpio&7)  argument
67 	return readl(IOMEM(c->regs + section_offset + port_offset));  in zevio_gpio_port_get()
74 	writel(val, IOMEM(c->regs + section_offset + port_offset));  in zevio_gpio_port_set()
83 	spin_lock(&controller->lock);  in zevio_gpio_get()
89 	spin_unlock(&controller->lock);  in zevio_gpio_get()
99 	spin_lock(&controller->lock);  in zevio_gpio_set()
107 	spin_unlock(&controller->lock);  in zevio_gpio_set()
117 	spin_lock(&controller->lock);  in zevio_gpio_direction_input()
123 	spin_unlock(&controller->lock);  in zevio_gpio_direction_input()
134 	spin_lock(&controller->lock);  in zevio_gpio_direction_output()
146 	spin_unlock(&controller->lock);  in zevio_gpio_direction_output()
158 	return -ENXIO;  in zevio_gpio_to_irq()
175 	struct device *dev = &pdev->dev;  in zevio_gpio_probe()
179 	controller = devm_kzalloc(&pdev->dev, sizeof(*controller), GFP_KERNEL);  in zevio_gpio_probe()
181 		return -ENOMEM;  in zevio_gpio_probe()
184 	controller->chip = zevio_gpio_chip;  in zevio_gpio_probe()
185 	controller->chip.parent = &pdev->dev;  in zevio_gpio_probe()
187 	controller->chip.label = devm_kasprintf(dev, GFP_KERNEL, "%pfw", dev_fwnode(dev));  in zevio_gpio_probe()
188 	if (!controller->chip.label)  in zevio_gpio_probe()
189 		return -ENOMEM;  in zevio_gpio_probe()
191 	controller->regs = devm_platform_ioremap_resource(pdev, 0);  in zevio_gpio_probe()
192 	if (IS_ERR(controller->regs))  in zevio_gpio_probe()
193 		return dev_err_probe(&pdev->dev, PTR_ERR(controller->regs),  in zevio_gpio_probe()
196 	status = devm_gpiochip_add_data(&pdev->dev, &controller->chip, controller);  in zevio_gpio_probe()
198 		dev_err(&pdev->dev, "failed to add gpiochip: %d\n", status);  in zevio_gpio_probe()
202 	spin_lock_init(&controller->lock);  in zevio_gpio_probe()
205 	for (i = 0; i < controller->chip.ngpio; i += 8)  in zevio_gpio_probe()
208 	dev_dbg(controller->chip.parent, "ZEVIO GPIO controller set up!\n");  in zevio_gpio_probe()
214 	{ .compatible = "lsi,zevio-gpio", },
220 		.name	= "gpio-zevio",