ohci-omap.c

来自「优龙2410linux2.6.8内核源代码」· C语言 代码 · 共 671 行 · 第 1/2 页

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

static irqreturn_t usb_hcd_omap_hcim_irq (int irq, void *__hcd, struct pt_regs * r)
{
	struct usb_hcd *hcd = __hcd;

	return usb_hcd_irq(irq, hcd, r);
}

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

void usb_hcd_omap_remove (struct usb_hcd *, struct omap_dev *);

/* configure so an HC device and id are always provided */
/* always called with process context; sleeping is OK */


/**
 * usb_hcd_omap_probe - initialize OMAP-based HCDs
 * Context: !in_interrupt()
 *
 * Allocates basic resources for this USB host controller, and
 * then invokes the start() method for the HCD associated with it
 * through the hotplug entry's driver_data.
 *
 * Store this function in the HCD's struct pci_driver as probe().
 */
int usb_hcd_omap_probe (const struct hc_driver *driver,
			  struct usb_hcd **hcd_out,
			  struct omap_dev *dev)
{
	int retval;
	struct usb_hcd *hcd = 0;

	if (!request_mem_region(dev->res.start, 
				dev->res.end - dev->res.start + 1, hcd_name)) {
		dbg("request_mem_region failed");
		return -EBUSY;
	}

	omap_start_hc(dev);

	hcd = driver->hcd_alloc ();
	if (hcd == NULL){
		dbg ("hcd_alloc failed");
		retval = -ENOMEM;
		goto err1;
	}

	hcd->driver = (struct hc_driver *) driver;
	hcd->description = driver->description;
	hcd->irq = dev->irq[0];
	hcd->regs = dev->mapbase;
	hcd->self.controller = &dev->dev;

	retval = hcd_buffer_create (hcd);
	if (retval != 0) {
		dbg ("pool alloc fail");
		goto err1;
	}

	retval = request_irq (hcd->irq, 
			      usb_hcd_omap_hcim_irq, 
			      SA_INTERRUPT, hcd->description, hcd);
	if (retval != 0) {
		dbg("request_irq failed");
		retval = -EBUSY;
		goto err2;
	}

	info ("%s (OMAP) at 0x%p, irq %d\n",
	      hcd->description, hcd->regs, hcd->irq);

	usb_bus_init (&hcd->self);
	hcd->self.op = &usb_hcd_operations;
	hcd->self.hcpriv = (void *) hcd;
	hcd->self.bus_name = "omap";
	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, dev);
		return retval;
	}

	*hcd_out = hcd;
	return 0;

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

	release_mem_region(dev->res.start, dev->res.end - dev->res.start + 1);

	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 omap_dev *dev)
{
	void *base;

	info ("remove: %s, state %x", hcd->self.bus_name, hcd->state);

	if (in_interrupt ())
		BUG ();

	hcd->state = USB_STATE_QUIESCING;

	dbg ("%s: roothub graceful disconnect", hcd->self.bus_name);
	usb_disconnect (&hcd->self.root_hub);

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

	free_irq (hcd->irq, hcd);

	usb_deregister_bus (&hcd->self);

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

	omap_stop_hc(dev);

	release_mem_region(dev->res.start, dev->res.end - dev->res.start + 1);
}

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

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

	ohci->hcca = dma_alloc_consistent (hcd->self.controller,
			sizeof *ohci->hcca, &ohci->hcca_dma);
	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 (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;
	}
	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,
#ifdef	CONFIG_PM
	/* suspend:		ohci_omap_suspend,  -- tbd */
	/* resume:		ohci_omap_resume,   -- tbd */
#endif
	.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
};

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

static int ohci_hcd_omap_drv_probe(struct omap_dev *dev)
{
	struct usb_hcd *hcd = NULL;
	int ret;

	if (usb_disabled())
		return -ENODEV;

	ret = usb_hcd_omap_probe(&ohci_omap_hc_driver, &hcd, dev);

	if (ret == 0)
		omap_set_drvdata(dev, hcd);

	return ret;
}

static int ohci_hcd_omap_drv_remove(struct omap_dev *dev)
{
	struct usb_hcd *hcd = omap_get_drvdata(dev);

	usb_hcd_omap_remove(hcd, dev);

	omap_set_drvdata(dev, NULL);

	return 0;
}

/*
 * Driver definition to register with the OMAP bus
 */
static struct omap_driver ohci_hcd_omap_driver = {
	.drv = {
		.name	= OMAP_OHCI_NAME,
	},
	.devid		= OMAP_OCP_DEVID_USB,
	.busid		= OMAP_BUS_OCP,
	.clocks		= 0,
	.probe		= ohci_hcd_omap_drv_probe,
	.remove		= ohci_hcd_omap_drv_remove,
};

/* Any dma_mask must be set for OHCI to work */
static u64 omap_dmamask = 0xffffffffUL;	

/*
 * Device definition to match the driver above
 */
static struct omap_dev ohci_hcd_omap_device = {
	.name		= OMAP_OHCI_NAME,
	.devid		= OMAP_OCP_DEVID_USB,
	.busid		= OMAP_BUS_OCP,
	.mapbase	= (void *)OMAP_OHCI_BASE,
	.dma_mask	= &omap_dmamask,	/* Needed only for OHCI */
	.res = {
		.start	= OMAP_OHCI_BASE,
		.end	= OMAP_OHCI_BASE + OMAP_OHCI_SIZE,
	},
	.irq = {
		INT_USB_HHC_1,
	},
};

static int __init ohci_hcd_omap_init (void)
{
	int ret;

	dbg (DRIVER_INFO " (OMAP)");
	dbg ("block sizes: ed %d td %d\n",
		sizeof (struct ed), sizeof (struct td));

	if (hmc_mode < 0 || hmc_mode > 25)
		hmc_mode = default_hmc_mode;

	/* Register the driver with OMAP bus */
	ret = omap_driver_register(&ohci_hcd_omap_driver);
	if (ret != 0)
		return -ENODEV;

	/* Register the device with OMAP bus */
	ret = omap_device_register(&ohci_hcd_omap_device);
	if (ret != 0) {
		omap_driver_unregister(&ohci_hcd_omap_driver);
		return -ENODEV;
	}

	return ret;
}

MODULE_PARM(hmc_mode, "hmc_mode");

static void __exit ohci_hcd_omap_cleanup (void)
{
	omap_device_unregister(&ohci_hcd_omap_device);
	omap_driver_unregister(&ohci_hcd_omap_driver);
}

module_init (ohci_hcd_omap_init);
module_exit (ohci_hcd_omap_cleanup);