111 lines
2.7 KiB
C
111 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* GPIO Driver for Loongson 1 SoC
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*
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* Copyright (C) 2015-2023 Keguang Zhang <keguang.zhang@gmail.com>
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*/
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#include <linux/module.h>
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#include <linux/gpio/driver.h>
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#include <linux/platform_device.h>
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#include <linux/bitops.h>
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/* Loongson 1 GPIO Register Definitions */
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#define GPIO_CFG 0x0
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#define GPIO_DIR 0x10
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#define GPIO_DATA 0x20
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#define GPIO_OUTPUT 0x30
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struct ls1x_gpio_chip {
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struct gpio_chip gc;
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void __iomem *reg_base;
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};
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static int ls1x_gpio_request(struct gpio_chip *gc, unsigned int offset)
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{
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struct ls1x_gpio_chip *ls1x_gc = gpiochip_get_data(gc);
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unsigned long flags;
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raw_spin_lock_irqsave(&gc->bgpio_lock, flags);
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__raw_writel(__raw_readl(ls1x_gc->reg_base + GPIO_CFG) | BIT(offset),
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ls1x_gc->reg_base + GPIO_CFG);
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raw_spin_unlock_irqrestore(&gc->bgpio_lock, flags);
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return 0;
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}
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static void ls1x_gpio_free(struct gpio_chip *gc, unsigned int offset)
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{
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struct ls1x_gpio_chip *ls1x_gc = gpiochip_get_data(gc);
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unsigned long flags;
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raw_spin_lock_irqsave(&gc->bgpio_lock, flags);
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__raw_writel(__raw_readl(ls1x_gc->reg_base + GPIO_CFG) & ~BIT(offset),
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ls1x_gc->reg_base + GPIO_CFG);
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raw_spin_unlock_irqrestore(&gc->bgpio_lock, flags);
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}
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static int ls1x_gpio_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct ls1x_gpio_chip *ls1x_gc;
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int ret;
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ls1x_gc = devm_kzalloc(dev, sizeof(*ls1x_gc), GFP_KERNEL);
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if (!ls1x_gc)
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return -ENOMEM;
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ls1x_gc->reg_base = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(ls1x_gc->reg_base))
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return PTR_ERR(ls1x_gc->reg_base);
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ret = bgpio_init(&ls1x_gc->gc, dev, 4, ls1x_gc->reg_base + GPIO_DATA,
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ls1x_gc->reg_base + GPIO_OUTPUT, NULL,
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NULL, ls1x_gc->reg_base + GPIO_DIR, 0);
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if (ret)
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goto err;
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ls1x_gc->gc.owner = THIS_MODULE;
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ls1x_gc->gc.request = ls1x_gpio_request;
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ls1x_gc->gc.free = ls1x_gpio_free;
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/*
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* Clear ngpio to let gpiolib get the correct number
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* by reading ngpios property
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*/
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ls1x_gc->gc.ngpio = 0;
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ret = devm_gpiochip_add_data(dev, &ls1x_gc->gc, ls1x_gc);
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if (ret)
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goto err;
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platform_set_drvdata(pdev, ls1x_gc);
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dev_info(dev, "GPIO controller registered with %d pins\n",
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ls1x_gc->gc.ngpio);
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return 0;
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err:
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dev_err(dev, "failed to register GPIO controller\n");
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return ret;
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}
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static const struct of_device_id ls1x_gpio_dt_ids[] = {
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{ .compatible = "loongson,ls1x-gpio" },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, ls1x_gpio_dt_ids);
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static struct platform_driver ls1x_gpio_driver = {
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.probe = ls1x_gpio_probe,
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.driver = {
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.name = "ls1x-gpio",
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.of_match_table = ls1x_gpio_dt_ids,
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},
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};
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module_platform_driver(ls1x_gpio_driver);
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MODULE_AUTHOR("Keguang Zhang <keguang.zhang@gmail.com>");
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MODULE_DESCRIPTION("Loongson1 GPIO driver");
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MODULE_LICENSE("GPL");
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