275 lines
6.3 KiB
C
275 lines
6.3 KiB
C
/*
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* SAMSUNG EXYNOS USB HOST OHCI Controller
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*
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* Copyright (C) 2011 Samsung Electronics Co.Ltd
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* Author: Jingoo Han <jg1.han@samsung.com>
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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 as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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*/
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#include <linux/clk.h>
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#include <linux/platform_device.h>
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#include <mach/ohci.h>
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#include <plat/usb-phy.h>
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struct exynos_ohci_hcd {
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struct device *dev;
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struct usb_hcd *hcd;
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struct clk *clk;
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};
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static int ohci_exynos_start(struct usb_hcd *hcd)
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{
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struct ohci_hcd *ohci = hcd_to_ohci(hcd);
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int ret;
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ohci_dbg(ohci, "ohci_exynos_start, ohci:%p", ohci);
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ret = ohci_init(ohci);
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if (ret < 0)
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return ret;
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ret = ohci_run(ohci);
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if (ret < 0) {
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err("can't start %s", hcd->self.bus_name);
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ohci_stop(hcd);
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return ret;
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}
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return 0;
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}
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static const struct hc_driver exynos_ohci_hc_driver = {
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.description = hcd_name,
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.product_desc = "EXYNOS OHCI Host Controller",
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.hcd_priv_size = sizeof(struct ohci_hcd),
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.irq = ohci_irq,
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.flags = HCD_MEMORY|HCD_USB11,
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.start = ohci_exynos_start,
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.stop = ohci_stop,
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.shutdown = ohci_shutdown,
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.get_frame_number = ohci_get_frame,
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.urb_enqueue = ohci_urb_enqueue,
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.urb_dequeue = ohci_urb_dequeue,
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.endpoint_disable = ohci_endpoint_disable,
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.hub_status_data = ohci_hub_status_data,
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.hub_control = ohci_hub_control,
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#ifdef CONFIG_PM
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.bus_suspend = ohci_bus_suspend,
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.bus_resume = ohci_bus_resume,
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#endif
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.start_port_reset = ohci_start_port_reset,
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};
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static int __devinit exynos_ohci_probe(struct platform_device *pdev)
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{
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struct exynos4_ohci_platdata *pdata;
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struct exynos_ohci_hcd *exynos_ohci;
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struct usb_hcd *hcd;
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struct ohci_hcd *ohci;
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struct resource *res;
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int irq;
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int err;
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pdata = pdev->dev.platform_data;
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if (!pdata) {
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dev_err(&pdev->dev, "No platform data defined\n");
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return -EINVAL;
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}
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exynos_ohci = kzalloc(sizeof(struct exynos_ohci_hcd), GFP_KERNEL);
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if (!exynos_ohci)
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return -ENOMEM;
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exynos_ohci->dev = &pdev->dev;
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hcd = usb_create_hcd(&exynos_ohci_hc_driver, &pdev->dev,
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dev_name(&pdev->dev));
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if (!hcd) {
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dev_err(&pdev->dev, "Unable to create HCD\n");
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err = -ENOMEM;
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goto fail_hcd;
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}
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exynos_ohci->hcd = hcd;
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exynos_ohci->clk = clk_get(&pdev->dev, "usbhost");
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if (IS_ERR(exynos_ohci->clk)) {
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dev_err(&pdev->dev, "Failed to get usbhost clock\n");
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err = PTR_ERR(exynos_ohci->clk);
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goto fail_clk;
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}
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err = clk_enable(exynos_ohci->clk);
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if (err)
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goto fail_clken;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res) {
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dev_err(&pdev->dev, "Failed to get I/O memory\n");
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err = -ENXIO;
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goto fail_io;
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}
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hcd->rsrc_start = res->start;
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hcd->rsrc_len = resource_size(res);
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hcd->regs = ioremap(res->start, resource_size(res));
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if (!hcd->regs) {
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dev_err(&pdev->dev, "Failed to remap I/O memory\n");
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err = -ENOMEM;
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goto fail_io;
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}
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irq = platform_get_irq(pdev, 0);
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if (!irq) {
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dev_err(&pdev->dev, "Failed to get IRQ\n");
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err = -ENODEV;
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goto fail;
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}
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if (pdata->phy_init)
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pdata->phy_init(pdev, S5P_USB_PHY_HOST);
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ohci = hcd_to_ohci(hcd);
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ohci_hcd_init(ohci);
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err = usb_add_hcd(hcd, irq, IRQF_SHARED);
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if (err) {
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dev_err(&pdev->dev, "Failed to add USB HCD\n");
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goto fail;
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}
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platform_set_drvdata(pdev, exynos_ohci);
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return 0;
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fail:
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iounmap(hcd->regs);
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fail_io:
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clk_disable(exynos_ohci->clk);
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fail_clken:
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clk_put(exynos_ohci->clk);
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fail_clk:
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usb_put_hcd(hcd);
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fail_hcd:
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kfree(exynos_ohci);
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return err;
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}
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static int __devexit exynos_ohci_remove(struct platform_device *pdev)
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{
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struct exynos4_ohci_platdata *pdata = pdev->dev.platform_data;
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struct exynos_ohci_hcd *exynos_ohci = platform_get_drvdata(pdev);
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struct usb_hcd *hcd = exynos_ohci->hcd;
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usb_remove_hcd(hcd);
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if (pdata && pdata->phy_exit)
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pdata->phy_exit(pdev, S5P_USB_PHY_HOST);
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iounmap(hcd->regs);
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clk_disable(exynos_ohci->clk);
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clk_put(exynos_ohci->clk);
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usb_put_hcd(hcd);
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kfree(exynos_ohci);
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return 0;
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}
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static void exynos_ohci_shutdown(struct platform_device *pdev)
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{
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struct exynos_ohci_hcd *exynos_ohci = platform_get_drvdata(pdev);
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struct usb_hcd *hcd = exynos_ohci->hcd;
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if (hcd->driver->shutdown)
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hcd->driver->shutdown(hcd);
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}
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#ifdef CONFIG_PM
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static int exynos_ohci_suspend(struct device *dev)
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{
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struct exynos_ohci_hcd *exynos_ohci = dev_get_drvdata(dev);
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struct usb_hcd *hcd = exynos_ohci->hcd;
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struct ohci_hcd *ohci = hcd_to_ohci(hcd);
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struct platform_device *pdev = to_platform_device(dev);
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struct exynos4_ohci_platdata *pdata = pdev->dev.platform_data;
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unsigned long flags;
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int rc = 0;
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/*
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* Root hub was already suspended. Disable irq emission and
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* mark HW unaccessible, bail out if RH has been resumed. Use
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* the spinlock to properly synchronize with possible pending
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* RH suspend or resume activity.
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*
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* This is still racy as hcd->state is manipulated outside of
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* any locks =P But that will be a different fix.
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*/
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spin_lock_irqsave(&ohci->lock, flags);
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if (hcd->state != HC_STATE_SUSPENDED && hcd->state != HC_STATE_HALT) {
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rc = -EINVAL;
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goto fail;
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}
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clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
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if (pdata && pdata->phy_exit)
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pdata->phy_exit(pdev, S5P_USB_PHY_HOST);
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fail:
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spin_unlock_irqrestore(&ohci->lock, flags);
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return rc;
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}
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static int exynos_ohci_resume(struct device *dev)
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{
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struct exynos_ohci_hcd *exynos_ohci = dev_get_drvdata(dev);
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struct usb_hcd *hcd = exynos_ohci->hcd;
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struct platform_device *pdev = to_platform_device(dev);
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struct exynos4_ohci_platdata *pdata = pdev->dev.platform_data;
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if (pdata && pdata->phy_init)
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pdata->phy_init(pdev, S5P_USB_PHY_HOST);
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/* Mark hardware accessible again as we are out of D3 state by now */
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set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
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ohci_finish_controller_resume(hcd);
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return 0;
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}
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#else
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#define exynos_ohci_suspend NULL
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#define exynos_ohci_resume NULL
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#endif
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static const struct dev_pm_ops exynos_ohci_pm_ops = {
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.suspend = exynos_ohci_suspend,
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.resume = exynos_ohci_resume,
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};
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static struct platform_driver exynos_ohci_driver = {
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.probe = exynos_ohci_probe,
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.remove = __devexit_p(exynos_ohci_remove),
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.shutdown = exynos_ohci_shutdown,
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.driver = {
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.name = "exynos-ohci",
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.owner = THIS_MODULE,
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.pm = &exynos_ohci_pm_ops,
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}
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};
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MODULE_ALIAS("platform:exynos-ohci");
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MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
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