ehci-platform.c

/*
 * Generic platform ehci driver
 *
 * Copyright 2007 Steven Brown <sbrown@cortland.com>
 * Copyright 2010-2012 Hauke Mehrtens <hauke@hauke-m.de>
 *
 * Derived from the ohci-ssb driver
 * Copyright 2007 Michael Buesch <m@bues.ch>
 *
 * Derived from the EHCI-PCI driver
 * Copyright (c) 2000-2004 by David Brownell
 *
 * Derived from the ohci-pci driver
 * Copyright 1999 Roman Weissgaerber
 * Copyright 2000-2002 David Brownell
 * Copyright 1999 Linus Torvalds
 * Copyright 1999 Gregory P. Smith
 *
 * Licensed under the GNU/GPL. See COPYING for details.
 */
#include <linux/platform_device.h>
#include <linux/usb/ehci_pdriver.h>

static int ehci_platform_reset(struct usb_hcd *hcd)
{
	struct platform_device *pdev = to_platform_device(hcd->self.controller);
	struct usb_ehci_pdata *pdata = pdev->dev.platform_data;
	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
	int retval;

	hcd->has_tt = pdata->has_tt;
	ehci->has_synopsys_hc_bug = pdata->has_synopsys_hc_bug;
	ehci->big_endian_desc = pdata->big_endian_desc;
	ehci->big_endian_mmio = pdata->big_endian_mmio;

	ehci->caps = hcd->regs + pdata->caps_offset;
	retval = ehci_setup(hcd);
	if (retval)
		return retval;

	if (pdata->no_io_watchdog)
		ehci->need_io_watchdog = 0;
	if (pdata->port_power_on)
		ehci_port_power(ehci, 1);
	if (pdata->port_power_off)
		ehci_port_power(ehci, 0);

	return 0;
}

static const struct hc_driver ehci_platform_hc_driver = {
	.description		= hcd_name,
	.product_desc		= "Generic Platform EHCI Controller",
	.hcd_priv_size		= sizeof(struct ehci_hcd),

	.irq			= ehci_irq,
	.flags			= HCD_MEMORY | HCD_USB2,

	.reset			= ehci_platform_reset,
	.start			= ehci_run,
	.stop			= ehci_stop,
	.shutdown		= ehci_shutdown,

	.urb_enqueue		= ehci_urb_enqueue,
	.urb_dequeue		= ehci_urb_dequeue,
	.endpoint_disable	= ehci_endpoint_disable,
	.endpoint_reset		= ehci_endpoint_reset,

	.get_frame_number	= ehci_get_frame,

	.hub_status_data	= ehci_hub_status_data,
	.hub_control		= ehci_hub_control,
#if defined(CONFIG_PM)
	.bus_suspend		= ehci_bus_suspend,
	.bus_resume		= ehci_bus_resume,
#endif
	.relinquish_port	= ehci_relinquish_port,
	.port_handed_over	= ehci_port_handed_over,

	.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
};

static int __devinit ehci_platform_probe(struct platform_device *dev)
{
	struct usb_hcd *hcd;
	struct resource *res_mem;
	struct usb_ehci_pdata *pdata = dev->dev.platform_data;
	int irq;
	int err = -ENOMEM;

	if (!pdata) {
		WARN_ON(1);
		return -ENODEV;
	}

	if (usb_disabled())
		return -ENODEV;

	irq = platform_get_irq(dev, 0);
	if (irq < 0) {
		dev_err(&dev->dev, "no irq provided");
		return irq;
	}
	res_mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
	if (!res_mem) {
		dev_err(&dev->dev, "no memory resource provided");
		return -ENXIO;
	}

	if (pdata->power_on) {
		err = pdata->power_on(dev);
		if (err < 0)
			return err;
	}

	hcd = usb_create_hcd(&ehci_platform_hc_driver, &dev->dev,
			     dev_name(&dev->dev));
	if (!hcd) {
		err = -ENOMEM;
		goto err_power;
	}

	hcd->rsrc_start = res_mem->start;
	hcd->rsrc_len = resource_size(res_mem);

	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
		dev_err(&dev->dev, "controller already in use");
		err = -EBUSY;
		goto err_put_hcd;
	}

	hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
	if (!hcd->regs) {
		err = -ENOMEM;
		goto err_release_region;
	}
	err = usb_add_hcd(hcd, irq, IRQF_SHARED);
	if (err)
		goto err_iounmap;

	platform_set_drvdata(dev, hcd);

	return err;

err_iounmap:
	iounmap(hcd->regs);
err_release_region:
	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
err_put_hcd:
	usb_put_hcd(hcd);
err_power:
	if (pdata->power_off)
		pdata->power_off(dev);

	return err;
}

static int __devexit ehci_platform_remove(struct platform_device *dev)
{
	struct usb_hcd *hcd = platform_get_drvdata(dev);
	struct usb_ehci_pdata *pdata = dev->dev.platform_data;

	usb_remove_hcd(hcd);
	iounmap(hcd->regs);
	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
	usb_put_hcd(hcd);
	platform_set_drvdata(dev, NULL);

	if (pdata->power_off)
		pdata->power_off(dev);

	return 0;
}

#ifdef CONFIG_PM

static int ehci_platform_suspend(struct device *dev)
{
	struct usb_hcd *hcd = dev_get_drvdata(dev);
	struct usb_ehci_pdata *pdata = dev->platform_data;
	struct platform_device *pdev =
		container_of(dev, struct platform_device, dev);
	bool do_wakeup = device_may_wakeup(dev);
	int ret;

	ret = ehci_suspend(hcd, do_wakeup);

	if (pdata->power_suspend)
		pdata->power_suspend(pdev);

	return ret;
}

static int ehci_platform_resume(struct device *dev)
{
	struct usb_hcd *hcd = dev_get_drvdata(dev);
	struct usb_ehci_pdata *pdata = dev->platform_data;
	struct platform_device *pdev =
		container_of(dev, struct platform_device, dev);

	if (pdata->power_on) {
		int err = pdata->power_on(pdev);
		if (err < 0)
			return err;
	}

	ehci_resume(hcd, false);
	return 0;
}

#else /* !CONFIG_PM */
#define ehci_platform_suspend	NULL
#define ehci_platform_resume	NULL
#endif /* CONFIG_PM */

static const struct platform_device_id ehci_platform_table[] = {
	{ "ehci-platform", 0 },
	{ }
};
MODULE_DEVICE_TABLE(platform, ehci_platform_table);

static const struct dev_pm_ops ehci_platform_pm_ops = {
	.suspend	= ehci_platform_suspend,
	.resume		= ehci_platform_resume,
};

static struct platform_driver ehci_platform_driver = {
	.id_table	= ehci_platform_table,
	.probe		= ehci_platform_probe,
	.remove		= __devexit_p(ehci_platform_remove),
	.shutdown	= usb_hcd_platform_shutdown,
	.driver		= {
		.owner	= THIS_MODULE,
		.name	= "ehci-platform",
		.pm	= &ehci_platform_pm_ops,
	}
};