Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2)  * GPIO Driver for Loongson 1 SoC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  * Copyright (C) 2015-2016 Zhang, Keguang <keguang.zhang@gmail.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  * This file is licensed under the terms of the GNU General Public
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  * License version 2. This program is licensed "as is" without any
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  * warranty of any kind, whether express or implied.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/gpio/driver.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/bitops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) /* Loongson 1 GPIO Register Definitions */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #define GPIO_CFG		0x0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #define GPIO_DIR		0x10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #define GPIO_DATA		0x20
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #define GPIO_OUTPUT		0x30
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) static void __iomem *gpio_reg_base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) static int ls1x_gpio_request(struct gpio_chip *gc, unsigned int offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	spin_lock_irqsave(&gc->bgpio_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	__raw_writel(__raw_readl(gpio_reg_base + GPIO_CFG) | BIT(offset),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 		     gpio_reg_base + GPIO_CFG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	spin_unlock_irqrestore(&gc->bgpio_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) static void ls1x_gpio_free(struct gpio_chip *gc, unsigned int offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	spin_lock_irqsave(&gc->bgpio_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	__raw_writel(__raw_readl(gpio_reg_base + GPIO_CFG) & ~BIT(offset),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 		     gpio_reg_base + GPIO_CFG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	spin_unlock_irqrestore(&gc->bgpio_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) static int ls1x_gpio_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	struct device *dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	struct gpio_chip *gc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	gc = devm_kzalloc(dev, sizeof(*gc), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 	if (!gc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 	gpio_reg_base = devm_platform_ioremap_resource(pdev, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 	if (IS_ERR(gpio_reg_base))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 		return PTR_ERR(gpio_reg_base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 	ret = bgpio_init(gc, dev, 4, gpio_reg_base + GPIO_DATA,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 			 gpio_reg_base + GPIO_OUTPUT, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 			 NULL, gpio_reg_base + GPIO_DIR, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 		goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 	gc->owner = THIS_MODULE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 	gc->request = ls1x_gpio_request;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 	gc->free = ls1x_gpio_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 	gc->base = pdev->id * 32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 	ret = devm_gpiochip_add_data(dev, gc, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 		goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 	platform_set_drvdata(pdev, gc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) 	dev_info(dev, "Loongson1 GPIO driver registered\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) 	dev_err(dev, "failed to register GPIO device\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) static struct platform_driver ls1x_gpio_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) 	.probe	= ls1x_gpio_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) 	.driver	= {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) 		.name	= "ls1x-gpio",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) module_platform_driver(ls1x_gpio_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) MODULE_AUTHOR("Kelvin Cheung <keguang.zhang@gmail.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) MODULE_DESCRIPTION("Loongson1 GPIO driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) MODULE_LICENSE("GPL");