1 // SPDX-License-Identifier: GPL-2.0-only
3  * GPIO Driver for Loongson 1 SoC
5  * Copyright (C) 2015-2023 Keguang Zhang <[email protected]>
9 #include <linux/gpio/driver.h>
13 /* Loongson 1 GPIO Register Definitions */
29 	raw_spin_lock_irqsave(&gc->bgpio_lock, flags);  in ls1x_gpio_request()
30 	__raw_writel(__raw_readl(ls1x_gc->reg_base + GPIO_CFG) | BIT(offset),  in ls1x_gpio_request()
31 		     ls1x_gc->reg_base + GPIO_CFG);  in ls1x_gpio_request()
32 	raw_spin_unlock_irqrestore(&gc->bgpio_lock, flags);  in ls1x_gpio_request()
42 	raw_spin_lock_irqsave(&gc->bgpio_lock, flags);  in ls1x_gpio_free()
43 	__raw_writel(__raw_readl(ls1x_gc->reg_base + GPIO_CFG) & ~BIT(offset),  in ls1x_gpio_free()
44 		     ls1x_gc->reg_base + GPIO_CFG);  in ls1x_gpio_free()
45 	raw_spin_unlock_irqrestore(&gc->bgpio_lock, flags);  in ls1x_gpio_free()
50 	struct device *dev = &pdev->dev;  in ls1x_gpio_probe()
56 		return -ENOMEM;  in ls1x_gpio_probe()
58 	ls1x_gc->reg_base = devm_platform_ioremap_resource(pdev, 0);  in ls1x_gpio_probe()
59 	if (IS_ERR(ls1x_gc->reg_base))  in ls1x_gpio_probe()
60 		return PTR_ERR(ls1x_gc->reg_base);  in ls1x_gpio_probe()
62 	ret = bgpio_init(&ls1x_gc->gc, dev, 4, ls1x_gc->reg_base + GPIO_DATA,  in ls1x_gpio_probe()
63 			 ls1x_gc->reg_base + GPIO_OUTPUT, NULL,  in ls1x_gpio_probe()
64 			 NULL, ls1x_gc->reg_base + GPIO_DIR, 0);  in ls1x_gpio_probe()
68 	ls1x_gc->gc.owner = THIS_MODULE;  in ls1x_gpio_probe()
69 	ls1x_gc->gc.request = ls1x_gpio_request;  in ls1x_gpio_probe()
70 	ls1x_gc->gc.free = ls1x_gpio_free;  in ls1x_gpio_probe()
75 	ls1x_gc->gc.ngpio = 0;  in ls1x_gpio_probe()
77 	ret = devm_gpiochip_add_data(dev, &ls1x_gc->gc, ls1x_gc);  in ls1x_gpio_probe()
83 	dev_info(dev, "GPIO controller registered with %d pins\n",  in ls1x_gpio_probe()
84 		 ls1x_gc->gc.ngpio);  in ls1x_gpio_probe()
88 	dev_err(dev, "failed to register GPIO controller\n");  in ls1x_gpio_probe()
93 	{ .compatible = "loongson,ls1x-gpio" },
101 		.name	= "ls1x-gpio",
109 MODULE_DESCRIPTION("Loongson1 GPIO driver");