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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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2f890cf0df
As we now allow the driver to be built as a module it should be removable. Signed-off-by: Alban Bedel <albeu@free.fr> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
119 lines
3.0 KiB
C
119 lines
3.0 KiB
C
/*
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* Atheros AR71XX/AR724X/AR913X GPIO API support
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*
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* Copyright (C) 2010-2011 Jaiganesh Narayanan <jnarayanan@atheros.com>
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* Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
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* Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
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*
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* Parts of this file are based on Atheros' 2.6.15/2.6.31 BSP
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*/
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#include <linux/gpio/driver.h>
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#include <linux/platform_data/gpio-ath79.h>
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#include <linux/of_device.h>
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#define AR71XX_GPIO_REG_OE 0x00
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#define AR71XX_GPIO_REG_IN 0x04
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#define AR71XX_GPIO_REG_SET 0x0c
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#define AR71XX_GPIO_REG_CLEAR 0x10
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struct ath79_gpio_ctrl {
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struct gpio_chip gc;
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void __iomem *base;
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spinlock_t lock;
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};
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static const struct of_device_id ath79_gpio_of_match[] = {
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{ .compatible = "qca,ar7100-gpio" },
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{ .compatible = "qca,ar9340-gpio" },
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{},
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};
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static int ath79_gpio_probe(struct platform_device *pdev)
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{
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struct ath79_gpio_platform_data *pdata = dev_get_platdata(&pdev->dev);
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struct device_node *np = pdev->dev.of_node;
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struct ath79_gpio_ctrl *ctrl;
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struct resource *res;
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u32 ath79_gpio_count;
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bool oe_inverted;
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int err;
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ctrl = devm_kzalloc(&pdev->dev, sizeof(*ctrl), GFP_KERNEL);
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if (!ctrl)
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return -ENOMEM;
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platform_set_drvdata(pdev, ctrl);
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if (np) {
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err = of_property_read_u32(np, "ngpios", &ath79_gpio_count);
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if (err) {
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dev_err(&pdev->dev, "ngpios property is not valid\n");
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return err;
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}
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if (ath79_gpio_count >= 32) {
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dev_err(&pdev->dev, "ngpios must be less than 32\n");
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return -EINVAL;
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}
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oe_inverted = of_device_is_compatible(np, "qca,ar9340-gpio");
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} else if (pdata) {
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ath79_gpio_count = pdata->ngpios;
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oe_inverted = pdata->oe_inverted;
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} else {
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dev_err(&pdev->dev, "No DT node or platform data found\n");
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return -EINVAL;
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}
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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ctrl->base = devm_ioremap_nocache(
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&pdev->dev, res->start, resource_size(res));
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if (!ctrl->base)
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return -ENOMEM;
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spin_lock_init(&ctrl->lock);
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err = bgpio_init(&ctrl->gc, &pdev->dev, 4,
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ctrl->base + AR71XX_GPIO_REG_IN,
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ctrl->base + AR71XX_GPIO_REG_SET,
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ctrl->base + AR71XX_GPIO_REG_CLEAR,
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oe_inverted ? NULL : ctrl->base + AR71XX_GPIO_REG_OE,
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oe_inverted ? ctrl->base + AR71XX_GPIO_REG_OE : NULL,
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0);
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if (err) {
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dev_err(&pdev->dev, "bgpio_init failed\n");
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return err;
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}
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/* Use base 0 to stay compatible with legacy platforms */
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ctrl->gc.base = 0;
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err = gpiochip_add_data(&ctrl->gc, ctrl);
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if (err) {
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dev_err(&pdev->dev,
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"cannot add AR71xx GPIO chip, error=%d", err);
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return err;
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}
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return 0;
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}
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static int ath79_gpio_remove(struct platform_device *pdev)
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{
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struct ath79_gpio_ctrl *ctrl = platform_get_drvdata(pdev);
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gpiochip_remove(&ctrl->gc);
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return 0;
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}
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static struct platform_driver ath79_gpio_driver = {
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.driver = {
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.name = "ath79-gpio",
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.of_match_table = ath79_gpio_of_match,
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},
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.probe = ath79_gpio_probe,
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.remove = ath79_gpio_remove,
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};
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module_platform_driver(ath79_gpio_driver);
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