ohci-omap.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 640 行 · 第 1/2 页

	hcd->self.controller = &pdev->dev;

	retval = omap_start_hc(ohci, pdev);
	if (retval < 0)
		goto err2;

	retval = hcd_buffer_create (hcd);
	if (retval != 0) {
		dev_dbg(&pdev->dev, "pool alloc fail\n");
		goto err1;
	}

	retval = request_irq (hcd->irq, usb_hcd_irq,
			      SA_INTERRUPT, hcd->description, hcd);
	if (retval != 0) {
		dev_dbg(&pdev->dev, "request_irq failed\n");
		retval = -EBUSY;
		goto err2;
	}

	dev_info(&pdev->dev, "at 0x%p, irq %d\n", hcd->regs, hcd->irq);

	usb_bus_init (&hcd->self);
	hcd->self.op = &usb_hcd_operations;
	hcd->self.hcpriv = (void *) hcd;
	hcd->self.bus_name = pdev->dev.bus_id;
	hcd->product_desc = "OMAP OHCI";

	INIT_LIST_HEAD (&hcd->dev_list);
	usb_register_bus (&hcd->self);

	if ((retval = driver->start (hcd)) < 0)
	{
		usb_hcd_omap_remove(hcd, pdev);
		return retval;
	}

	return 0;

 err2:
	hcd_buffer_destroy (hcd);
	if (hcd)
		driver->hcd_free(hcd);
 err1:
	omap_stop_hc(pdev);

	release_mem_region(pdev->resource[0].start,
			   pdev->resource[0].end - pdev->resource[0].start + 1);

	dev_set_drvdata(&pdev->dev, 0);
	return retval;
}


/* may be called without controller electrically present */
/* may be called with controller, bus, and devices active */

/**
 * usb_hcd_omap_remove - shutdown processing for OMAP-based HCDs
 * @dev: USB Host Controller being removed
 * Context: !in_interrupt()
 *
 * Reverses the effect of usb_hcd_omap_probe(), first invoking
 * the HCD's stop() method.  It is always called from a thread
 * context, normally "rmmod", "apmd", or something similar.
 *
 */
void usb_hcd_omap_remove (struct usb_hcd *hcd, struct platform_device *pdev)
{
	void *base;

	dev_info(&pdev->dev, "remove: state %x\n", hcd->state);

	if (in_interrupt ())
		BUG ();

	hcd->state = USB_STATE_QUIESCING;

	dev_dbg(&pdev->dev, "roothub graceful disconnect\n");
	usb_disconnect (&hcd->self.root_hub);

	hcd->driver->stop (hcd);
	hcd_buffer_destroy (hcd);
	hcd->state = USB_STATE_HALT;

	if (machine_is_omap_osk())
		omap_free_gpio(9);

	free_irq (hcd->irq, hcd);

	usb_deregister_bus (&hcd->self);

	base = hcd->regs;
	hcd->driver->hcd_free (hcd);

	omap_stop_hc(pdev);

	release_mem_region(pdev->resource[0].start, 
			   pdev->resource[0].end - pdev->resource[0].start + 1);
}

/*-------------------------------------------------------------------------*/

static int __devinit
ohci_omap_start (struct usb_hcd *hcd)
{
	struct omap_usb_config *config;
	struct ohci_hcd	*ohci = hcd_to_ohci (hcd);
	int		ret;

	config = hcd->self.controller->platform_data;
	ohci->hcca = dma_alloc_coherent (hcd->self.controller,
			sizeof *ohci->hcca, &ohci->hcca_dma, 0);
	if (!ohci->hcca)
		return -ENOMEM;

        memset (ohci->hcca, 0, sizeof (struct ohci_hcca));
	if ((ret = ohci_mem_init (ohci)) < 0) {
		ohci_stop (hcd);
		return ret;
	}
	ohci->regs = hcd->regs;

	if (config->otg || config->rwc)
		writel(OHCI_CTRL_RWC, &ohci->regs->control);

	if (hc_reset (ohci) < 0) {
		ohci_stop (hcd);
		return -ENODEV;
	}

	if (hc_start (ohci) < 0) {
		err ("can't start %s", ohci->hcd.self.bus_name);
		ohci_stop (hcd);
		return -EBUSY;
	}
	if (ohci->power_budget)
		hub_set_power_budget(ohci->hcd.self.root_hub,
					ohci->power_budget);
	create_debug_files (ohci);

#ifdef	DEBUG
	ohci_dump (ohci, 1);
#endif
	return 0;
}

/*-------------------------------------------------------------------------*/

static const struct hc_driver ohci_omap_hc_driver = {
	.description =		hcd_name,

	/*
	 * generic hardware linkage
	 */
	.irq =			ohci_irq,
	.flags =		HCD_USB11,

	/*
	 * basic lifecycle operations
	 */
	.start =		ohci_omap_start,
	.stop =			ohci_stop,

	/*
	 * memory lifecycle (except per-request)
	 */
	.hcd_alloc =		ohci_hcd_alloc,
	.hcd_free =		ohci_hcd_free,

	/*
	 * managing i/o requests and associated device resources
	 */
	.urb_enqueue =		ohci_urb_enqueue,
	.urb_dequeue =		ohci_urb_dequeue,
	.endpoint_disable =	ohci_endpoint_disable,

	/*
	 * scheduling support
	 */
	.get_frame_number =	ohci_get_frame,

	/*
	 * root hub support
	 */
	.hub_status_data =	ohci_hub_status_data,
	.hub_control =		ohci_hub_control,
#ifdef	CONFIG_USB_SUSPEND
	.hub_suspend =		ohci_hub_suspend,
	.hub_resume =		ohci_hub_resume,
#endif
	.start_port_reset =	ohci_start_port_reset,
};

/*-------------------------------------------------------------------------*/

static int ohci_hcd_omap_drv_probe(struct device *dev)
{
	return usb_hcd_omap_probe(&ohci_omap_hc_driver,
				to_platform_device(dev));
}

static int ohci_hcd_omap_drv_remove(struct device *dev)
{
	struct platform_device	*pdev = to_platform_device(dev);
	struct usb_hcd		*hcd = dev_get_drvdata(dev);
	struct ohci_hcd		*ohci = hcd_to_ohci (hcd);

	usb_hcd_omap_remove(hcd, pdev);
	if (ohci->transceiver) {
		(void) otg_set_host(ohci->transceiver, 0);
		put_device(ohci->transceiver->dev);
	}
	dev_set_drvdata(dev, NULL);

	return 0;
}

/*-------------------------------------------------------------------------*/

#if	defined(CONFIG_USB_SUSPEND) || defined(CONFIG_PM)

/* states match PCI usage, always suspending the root hub except that
 * 4 ~= D3cold (ACPI D3) with clock off (resume sees reset).
 */

static int ohci_omap_suspend(struct device *dev, u32 state, u32 level)
{
	struct ohci_hcd	*ohci = hcd_to_ohci(dev_get_drvdata(dev));
	int		status = -EINVAL;

	if (state <= dev->power.power_state)
		return 0;

	dev_dbg(dev, "suspend to %d\n", state);
	down(&ohci->hcd.self.root_hub->serialize);
	status = ohci_hub_suspend(&ohci->hcd);
	if (status == 0) {
		if (state >= 4) {
			/* power off + reset */
			OTG_SYSCON_2_REG &= ~UHOST_EN;
			ohci->hcd.self.root_hub->state = USB_STATE_SUSPENDED;
			state = 4;
		}
		ohci->hcd.state = HCD_STATE_SUSPENDED;
		dev->power.power_state = state;
	}
	up(&ohci->hcd.self.root_hub->serialize);
	return status;
}

static int ohci_omap_resume(struct device *dev, u32 level)
{
	struct ohci_hcd	*ohci = hcd_to_ohci(dev_get_drvdata(dev));
	int		status = 0;

	switch (dev->power.power_state) {
	case 0:
		break;
	case 4:
		if (time_before(jiffies, ohci->next_statechange))
			msleep(5);
		ohci->next_statechange = jiffies;
		OTG_SYSCON_2_REG |= UHOST_EN;
		/* FALLTHROUGH */
	default:
		dev_dbg(dev, "resume from %d\n", dev->power.power_state);
#ifdef	CONFIG_USB_SUSPEND
		/* get extra cleanup even if remote wakeup isn't in use */
		status = usb_resume_device(ohci->hcd.self.root_hub);
#else
		down(&ohci->hcd.self.root_hub->serialize);
		status = ohci_hub_resume(&ohci->hcd);
		up(&ohci->hcd.self.root_hub->serialize);
#endif
		if (status == 0)
			dev->power.power_state = 0;
		break;
	}
	return status;
}

#endif

/*-------------------------------------------------------------------------*/

/*
 * Driver definition to register with the OMAP bus
 */
static struct device_driver ohci_hcd_omap_driver = {
	.name		= "ohci",
	.bus		= &platform_bus_type,
	.probe		= ohci_hcd_omap_drv_probe,
	.remove		= ohci_hcd_omap_drv_remove,
#if	defined(CONFIG_USB_SUSPEND) || defined(CONFIG_PM)
	.suspend	= ohci_omap_suspend,
	.resume		= ohci_omap_resume,
#endif
};

static int __init ohci_hcd_omap_init (void)
{
	printk (KERN_DEBUG "%s: " DRIVER_INFO " (OMAP)\n", hcd_name);
	if (usb_disabled())
		return -ENODEV;

	pr_debug("%s: block sizes: ed %Zd td %Zd\n", hcd_name,
		sizeof (struct ed), sizeof (struct td));

	return driver_register(&ohci_hcd_omap_driver);
}

static void __exit ohci_hcd_omap_cleanup (void)
{
	driver_unregister(&ohci_hcd_omap_driver);
}

module_init (ohci_hcd_omap_init);
module_exit (ohci_hcd_omap_cleanup);