1 // SPDX-License-Identifier: GPL-2.0-only
3  * GPIO controller in LSI ZEVIO SoCs.
5  * Author: Fabian Vogt <fabian@ritter-vogt.de>
17 #include <linux/gpio/driver.h>
21  * This chip has four gpio sections, each controls 8 GPIOs.
22  * Bit 0 in section 0 is GPIO 0, bit 2 in section 1 is GPIO 10.
25 …tp://hackspire.unsads.com/wiki/index.php/Memory-mapped_I/O_ports#90000000_-_General_Purpose_I.2FO_…
27  * 0x00-0x3F: Section 0
28  *     +0x00: Masked interrupt status (read-only)
31  *     +0x0C: W: Unmask interrupt (write-only)
34  *     +0x18: Input (read-only)
36  * 0x40-0x7F: Section 1
37  * 0x80-0xBF: Section 2
38  * 0xC0-0xFF: Section 3
53 /* Bit number of GPIO in its section */
54 #define ZEVIO_GPIO_BIT(gpio) (gpio&7)  argument
66 	return readl(IOMEM(c->regs + section_offset + port_offset));  in zevio_gpio_port_get()
73 	writel(val, IOMEM(c->regs + section_offset + port_offset));  in zevio_gpio_port_set()
80 	u32 val, dir;  in zevio_gpio_get()  local
82 	spin_lock(&controller->lock);  in zevio_gpio_get()
83 	dir = zevio_gpio_port_get(controller, pin, ZEVIO_GPIO_DIRECTION);  in zevio_gpio_get()
84 	if (dir & BIT(ZEVIO_GPIO_BIT(pin)))  in zevio_gpio_get()
88 	spin_unlock(&controller->lock);  in zevio_gpio_get()
98 	spin_lock(&controller->lock);  in zevio_gpio_set()
106 	spin_unlock(&controller->lock);  in zevio_gpio_set()
114 	spin_lock(&controller->lock);  in zevio_gpio_direction_input()
120 	spin_unlock(&controller->lock);  in zevio_gpio_direction_input()
131 	spin_lock(&controller->lock);  in zevio_gpio_direction_output()
143 	spin_unlock(&controller->lock);  in zevio_gpio_direction_output()
155 	return -ENXIO;  in zevio_gpio_to_irq()
175 	controller = devm_kzalloc(&pdev->dev, sizeof(*controller), GFP_KERNEL);  in zevio_gpio_probe()
177 		return -ENOMEM;  in zevio_gpio_probe()
180 	controller->chip = zevio_gpio_chip;  in zevio_gpio_probe()
181 	controller->chip.parent = &pdev->dev;  in zevio_gpio_probe()
183 	controller->regs = devm_platform_ioremap_resource(pdev, 0);  in zevio_gpio_probe()
184 	if (IS_ERR(controller->regs))  in zevio_gpio_probe()
185 		return dev_err_probe(&pdev->dev, PTR_ERR(controller->regs),  in zevio_gpio_probe()
188 	status = devm_gpiochip_add_data(&pdev->dev, &controller->chip, controller);  in zevio_gpio_probe()
190 		dev_err(&pdev->dev, "failed to add gpiochip: %d\n", status);  in zevio_gpio_probe()
194 	spin_lock_init(&controller->lock);  in zevio_gpio_probe()
197 	for (i = 0; i < controller->chip.ngpio; i += 8)  in zevio_gpio_probe()
200 	dev_dbg(controller->chip.parent, "ZEVIO GPIO controller set up!\n");  in zevio_gpio_probe()
206 	{ .compatible = "lsi,zevio-gpio", },
212 		.name	= "gpio-zevio",