299 lines
7.1 KiB
C
299 lines
7.1 KiB
C
/*
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* SAMSUNG S5P USB HOST EHCI 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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* Author: Joonyoung Shim <jy0922.shim@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 <plat/ehci.h>
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#include <plat/usb-phy.h>
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struct s5p_ehci_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 const struct hc_driver s5p_ehci_hc_driver = {
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.description = hcd_name,
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.product_desc = "S5P EHCI Host Controller",
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.hcd_priv_size = sizeof(struct ehci_hcd),
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.irq = ehci_irq,
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.flags = HCD_MEMORY | HCD_USB2,
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.reset = ehci_init,
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.start = ehci_run,
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.stop = ehci_stop,
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.shutdown = ehci_shutdown,
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.get_frame_number = ehci_get_frame,
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.urb_enqueue = ehci_urb_enqueue,
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.urb_dequeue = ehci_urb_dequeue,
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.endpoint_disable = ehci_endpoint_disable,
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.endpoint_reset = ehci_endpoint_reset,
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.hub_status_data = ehci_hub_status_data,
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.hub_control = ehci_hub_control,
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.bus_suspend = ehci_bus_suspend,
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.bus_resume = ehci_bus_resume,
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.relinquish_port = ehci_relinquish_port,
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.port_handed_over = ehci_port_handed_over,
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.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
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};
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static int __devinit s5p_ehci_probe(struct platform_device *pdev)
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{
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struct s5p_ehci_platdata *pdata;
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struct s5p_ehci_hcd *s5p_ehci;
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struct usb_hcd *hcd;
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struct ehci_hcd *ehci;
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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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s5p_ehci = kzalloc(sizeof(struct s5p_ehci_hcd), GFP_KERNEL);
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if (!s5p_ehci)
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return -ENOMEM;
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s5p_ehci->dev = &pdev->dev;
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hcd = usb_create_hcd(&s5p_ehci_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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s5p_ehci->hcd = hcd;
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s5p_ehci->clk = clk_get(&pdev->dev, "usbhost");
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if (IS_ERR(s5p_ehci->clk)) {
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dev_err(&pdev->dev, "Failed to get usbhost clock\n");
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err = PTR_ERR(s5p_ehci->clk);
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goto fail_clk;
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}
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err = clk_enable(s5p_ehci->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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ehci = hcd_to_ehci(hcd);
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ehci->caps = hcd->regs;
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ehci->regs = hcd->regs +
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HC_LENGTH(ehci, readl(&ehci->caps->hc_capbase));
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dbg_hcs_params(ehci, "reset");
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dbg_hcc_params(ehci, "reset");
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/* cache this readonly data; minimize chip reads */
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ehci->hcs_params = readl(&ehci->caps->hcs_params);
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ehci_reset(ehci);
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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, s5p_ehci);
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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(s5p_ehci->clk);
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fail_clken:
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clk_put(s5p_ehci->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(s5p_ehci);
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return err;
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}
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static int __devexit s5p_ehci_remove(struct platform_device *pdev)
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{
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struct s5p_ehci_platdata *pdata = pdev->dev.platform_data;
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struct s5p_ehci_hcd *s5p_ehci = platform_get_drvdata(pdev);
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struct usb_hcd *hcd = s5p_ehci->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(s5p_ehci->clk);
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clk_put(s5p_ehci->clk);
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usb_put_hcd(hcd);
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kfree(s5p_ehci);
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return 0;
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}
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static void s5p_ehci_shutdown(struct platform_device *pdev)
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{
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struct s5p_ehci_hcd *s5p_ehci = platform_get_drvdata(pdev);
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struct usb_hcd *hcd = s5p_ehci->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 s5p_ehci_suspend(struct device *dev)
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{
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struct s5p_ehci_hcd *s5p_ehci = dev_get_drvdata(dev);
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struct usb_hcd *hcd = s5p_ehci->hcd;
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struct ehci_hcd *ehci = hcd_to_ehci(hcd);
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struct platform_device *pdev = to_platform_device(dev);
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struct s5p_ehci_platdata *pdata = pdev->dev.platform_data;
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unsigned long flags;
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int rc = 0;
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if (time_before(jiffies, ehci->next_statechange))
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msleep(20);
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/*
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* Root hub was already suspended. Disable irq emission and
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* mark HW unaccessible. The PM and USB cores make sure that
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* the root hub is either suspended or stopped.
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*/
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ehci_prepare_ports_for_controller_suspend(ehci, device_may_wakeup(dev));
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spin_lock_irqsave(&ehci->lock, flags);
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ehci_writel(ehci, 0, &ehci->regs->intr_enable);
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(void)ehci_readl(ehci, &ehci->regs->intr_enable);
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clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
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spin_unlock_irqrestore(&ehci->lock, 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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return rc;
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}
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static int s5p_ehci_resume(struct device *dev)
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{
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struct s5p_ehci_hcd *s5p_ehci = dev_get_drvdata(dev);
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struct usb_hcd *hcd = s5p_ehci->hcd;
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struct ehci_hcd *ehci = hcd_to_ehci(hcd);
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struct platform_device *pdev = to_platform_device(dev);
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struct s5p_ehci_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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if (time_before(jiffies, ehci->next_statechange))
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msleep(100);
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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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if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF) {
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int mask = INTR_MASK;
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ehci_prepare_ports_for_controller_resume(ehci);
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if (!hcd->self.root_hub->do_remote_wakeup)
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mask &= ~STS_PCD;
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ehci_writel(ehci, mask, &ehci->regs->intr_enable);
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ehci_readl(ehci, &ehci->regs->intr_enable);
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return 0;
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}
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usb_root_hub_lost_power(hcd->self.root_hub);
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(void) ehci_halt(ehci);
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(void) ehci_reset(ehci);
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/* emptying the schedule aborts any urbs */
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spin_lock_irq(&ehci->lock);
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if (ehci->reclaim)
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end_unlink_async(ehci);
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ehci_work(ehci);
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spin_unlock_irq(&ehci->lock);
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ehci_writel(ehci, ehci->command, &ehci->regs->command);
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ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
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ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
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/* here we "know" root ports should always stay powered */
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ehci_port_power(ehci, 1);
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ehci->rh_state = EHCI_RH_SUSPENDED;
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return 0;
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}
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#else
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#define s5p_ehci_suspend NULL
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#define s5p_ehci_resume NULL
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#endif
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static const struct dev_pm_ops s5p_ehci_pm_ops = {
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.suspend = s5p_ehci_suspend,
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.resume = s5p_ehci_resume,
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};
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static struct platform_driver s5p_ehci_driver = {
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.probe = s5p_ehci_probe,
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.remove = __devexit_p(s5p_ehci_remove),
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.shutdown = s5p_ehci_shutdown,
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.driver = {
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.name = "s5p-ehci",
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.owner = THIS_MODULE,
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.pm = &s5p_ehci_pm_ops,
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}
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};
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MODULE_ALIAS("platform:s5p-ehci");
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