163 строки
3.5 KiB
C
163 строки
3.5 KiB
C
/*
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* Copyright 2012 Freescale Semiconductor, Inc.
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*
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* The code contained herein is licensed under the GNU General Public
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* License. You may obtain a copy of the GNU General Public License
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* Version 2 or later at the following locations:
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*
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* http://www.opensource.org/licenses/gpl-license.html
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* http://www.gnu.org/copyleft/gpl.html
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*/
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#include <linux/module.h>
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#include <linux/of_platform.h>
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#include <linux/clk.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include "ci13xxx_imx.h"
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#define USB_DEV_MAX 4
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#define BM_OVER_CUR_DIS BIT(7)
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struct imx6q_usbmisc {
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void __iomem *base;
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spinlock_t lock;
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struct clk *clk;
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struct usbmisc_usb_device usbdev[USB_DEV_MAX];
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};
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static struct imx6q_usbmisc *usbmisc;
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static struct usbmisc_usb_device *get_usbdev(struct device *dev)
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{
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int i, ret;
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for (i = 0; i < USB_DEV_MAX; i++) {
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if (usbmisc->usbdev[i].dev == dev)
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return &usbmisc->usbdev[i];
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else if (!usbmisc->usbdev[i].dev)
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break;
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}
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if (i >= USB_DEV_MAX)
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return ERR_PTR(-EBUSY);
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ret = usbmisc_get_init_data(dev, &usbmisc->usbdev[i]);
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if (ret)
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return ERR_PTR(ret);
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return &usbmisc->usbdev[i];
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}
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static int usbmisc_imx6q_init(struct device *dev)
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{
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struct usbmisc_usb_device *usbdev;
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unsigned long flags;
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u32 reg;
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usbdev = get_usbdev(dev);
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if (IS_ERR(usbdev))
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return PTR_ERR(usbdev);
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if (usbdev->disable_oc) {
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spin_lock_irqsave(&usbmisc->lock, flags);
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reg = readl(usbmisc->base + usbdev->index * 4);
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writel(reg | BM_OVER_CUR_DIS,
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usbmisc->base + usbdev->index * 4);
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spin_unlock_irqrestore(&usbmisc->lock, flags);
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}
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return 0;
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}
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static const struct usbmisc_ops imx6q_usbmisc_ops = {
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.init = usbmisc_imx6q_init,
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};
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static const struct of_device_id usbmisc_imx6q_dt_ids[] = {
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{ .compatible = "fsl,imx6q-usbmisc"},
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{ /* sentinel */ }
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};
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static int usbmisc_imx6q_probe(struct platform_device *pdev)
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{
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struct resource *res;
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struct imx6q_usbmisc *data;
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int ret;
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if (usbmisc)
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return -EBUSY;
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data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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spin_lock_init(&data->lock);
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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data->base = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(data->base))
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return PTR_ERR(data->base);
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data->clk = devm_clk_get(&pdev->dev, NULL);
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if (IS_ERR(data->clk)) {
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dev_err(&pdev->dev,
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"failed to get clock, err=%ld\n", PTR_ERR(data->clk));
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return PTR_ERR(data->clk);
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}
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ret = clk_prepare_enable(data->clk);
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if (ret) {
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dev_err(&pdev->dev,
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"clk_prepare_enable failed, err=%d\n", ret);
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return ret;
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}
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ret = usbmisc_set_ops(&imx6q_usbmisc_ops);
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if (ret) {
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clk_disable_unprepare(data->clk);
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return ret;
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}
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usbmisc = data;
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return 0;
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}
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static int usbmisc_imx6q_remove(struct platform_device *pdev)
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{
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usbmisc_unset_ops(&imx6q_usbmisc_ops);
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clk_disable_unprepare(usbmisc->clk);
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return 0;
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}
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static struct platform_driver usbmisc_imx6q_driver = {
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.probe = usbmisc_imx6q_probe,
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.remove = usbmisc_imx6q_remove,
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.driver = {
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.name = "usbmisc_imx6q",
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.owner = THIS_MODULE,
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.of_match_table = usbmisc_imx6q_dt_ids,
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},
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};
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int __init usbmisc_imx6q_drv_init(void)
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{
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return platform_driver_register(&usbmisc_imx6q_driver);
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}
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subsys_initcall(usbmisc_imx6q_drv_init);
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void __exit usbmisc_imx6q_drv_exit(void)
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{
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platform_driver_unregister(&usbmisc_imx6q_driver);
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}
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module_exit(usbmisc_imx6q_drv_exit);
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MODULE_ALIAS("platform:usbmisc-imx6q");
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("driver for imx6q usb non-core registers");
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MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>");
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