[PATCH] EHCI, split out PCI glue

This splits BIOS and PCI specific support out of ehci-hcd.c into
ehci-pci.c. It follows the model already used in the OHCI driver
so support for non-PCI EHCI controllers can be more easily added.

Signed-off-by: Matt Porter <[e-mail]>
Signed-off-by: David Brownell <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/host/ehci-hcd.c | 543 ++++++--------------------------------------
drivers/usb/host/ehci-pci.c | 414 +++++++++++++++++++++++++++++++++
drivers/usb/host/ehci.h | 1
3 files changed, 492 insertions(+), 466 deletions(-)

drivers/usb/host/ehci-hcd.c

···
 	spin_unlock_irqrestore (&ehci->lock, flags);
 }
 
-#ifdef	CONFIG_PCI
-
-/* EHCI 0.96 (and later) section 5.1 says how to kick BIOS/SMM/...
- * off the controller (maybe it can boot from highspeed USB disks).
- */
-static int bios_handoff (struct ehci_hcd *ehci, int where, u32 cap)
-{
-	struct pci_dev *pdev = to_pci_dev(ehci_to_hcd(ehci)->self.controller);
-
-	/* always say Linux will own the hardware */
-	pci_write_config_byte(pdev, where + 3, 1);
-
-	/* maybe wait a while for BIOS to respond */
-	if (cap & (1 << 16)) {
-		int msec = 5000;
-
-		do {
-			msleep(10);
-			msec -= 10;
-			pci_read_config_dword(pdev, where, &cap);
-		} while ((cap & (1 << 16)) && msec);
-		if (cap & (1 << 16)) {
-			ehci_err(ehci, "BIOS handoff failed (%d, %08x)\n",
-				where, cap);
-			// some BIOS versions seem buggy...
-			// return 1;
-			ehci_warn (ehci, "continuing after BIOS bug...\n");
-			/* disable all SMIs, and clear "BIOS owns" flag */
-			pci_write_config_dword(pdev, where + 4, 0);
-			pci_write_config_byte(pdev, where + 2, 0);
-		} else
-			ehci_dbg(ehci, "BIOS handoff succeeded\n");
-	}
-	return 0;
-}
-
-#endif
-
 /* Reboot notifiers kick in for silicon on any bus (not just pci, etc).
  * This forcibly disables dma and IRQs, helping kexec and other cases
  * where the next system software may expect clean state.
···
 	msleep(20);
 }
 
+/*-------------------------------------------------------------------------*/
 
-/* called by khubd or root hub init threads */
-
-static int ehci_hc_reset (struct usb_hcd *hcd)
+/*
+ * ehci_work is called from some interrupts, timers, and so on.
+ * it calls driver completion functions, after dropping ehci->lock.
+ */
+static void ehci_work (struct ehci_hcd *ehci, struct pt_regs *regs)
 {
-	struct ehci_hcd		*ehci = hcd_to_ehci (hcd);
-	u32			temp;
-	unsigned		count = 256/4;
+	timer_action_done (ehci, TIMER_IO_WATCHDOG);
+	if (ehci->reclaim_ready)
+		end_unlink_async (ehci, regs);
 
-	spin_lock_init (&ehci->lock);
+	/* another CPU may drop ehci->lock during a schedule scan while
+	 * it reports urb completions.  this flag guards against bogus
+	 * attempts at re-entrant schedule scanning.
+	 */
+	if (ehci->scanning)
+		return;
+	ehci->scanning = 1;
+	scan_async (ehci, regs);
+	if (ehci->next_uframe != -1)
+		scan_periodic (ehci, regs);
+	ehci->scanning = 0;
 
-	ehci->caps = hcd->regs;
-	ehci->regs = hcd->regs + HC_LENGTH (readl (&ehci->caps->hc_capbase));
-	dbg_hcs_params (ehci, "reset");
-	dbg_hcc_params (ehci, "reset");
-
-	/* cache this readonly data; minimize chip reads */
-	ehci->hcs_params = readl (&ehci->caps->hcs_params);
-
-#ifdef	CONFIG_PCI
-	if (hcd->self.controller->bus == &pci_bus_type) {
-		struct pci_dev	*pdev = to_pci_dev(hcd->self.controller);
-
-		switch (pdev->vendor) {
-		case PCI_VENDOR_ID_TDI:
-			if (pdev->device == PCI_DEVICE_ID_TDI_EHCI) {
-				ehci->is_tdi_rh_tt = 1;
-				tdi_reset (ehci);
-			}
-			break;
-		case PCI_VENDOR_ID_AMD:
-			/* AMD8111 EHCI doesn't work, according to AMD errata */
-			if (pdev->device == 0x7463) {
-				ehci_info (ehci, "ignoring AMD8111 (errata)\n");
-				return -EIO;
-			}
-			break;
-		case PCI_VENDOR_ID_NVIDIA:
-			/* NVidia reports that certain chips don't handle
-			 * QH, ITD, or SITD addresses above 2GB.  (But TD,
-			 * data buffer, and periodic schedule are normal.)
-			 */
-			switch (pdev->device) {
-			case 0x003c:	/* MCP04 */
-			case 0x005b:	/* CK804 */
-			case 0x00d8:	/* CK8 */
-			case 0x00e8:	/* CK8S */
-				if (pci_set_consistent_dma_mask(pdev,
-							DMA_31BIT_MASK) < 0)
-					ehci_warn (ehci, "can't enable NVidia "
-						"workaround for >2GB RAM\n");
-				break;
-			}
-			break;
-		}
-
-		/* optional debug port, normally in the first BAR */
-		temp = pci_find_capability (pdev, 0x0a);
-		if (temp) {
-			pci_read_config_dword(pdev, temp, &temp);
-			temp >>= 16;
-			if ((temp & (3 << 13)) == (1 << 13)) {
-				temp &= 0x1fff;
-				ehci->debug = hcd->regs + temp;
-				temp = readl (&ehci->debug->control);
-				ehci_info (ehci, "debug port %d%s\n",
-					HCS_DEBUG_PORT(ehci->hcs_params),
-					(temp & DBGP_ENABLED)
-						? " IN USE"
-						: "");
-				if (!(temp & DBGP_ENABLED))
-					ehci->debug = NULL;
-			}
-		}
-
-		temp = HCC_EXT_CAPS (readl (&ehci->caps->hcc_params));
-	} else
-		temp = 0;
-
-	/* EHCI 0.96 and later may have "extended capabilities" */
-	while (temp && count--) {
-		u32		cap;
-
-		pci_read_config_dword (to_pci_dev(hcd->self.controller),
-				temp, &cap);
-		ehci_dbg (ehci, "capability %04x at %02x\n", cap, temp);
-		switch (cap & 0xff) {
-		case 1:			/* BIOS/SMM/... handoff */
-			if (bios_handoff (ehci, temp, cap) != 0)
-				return -EOPNOTSUPP;
-			break;
-		case 0:			/* illegal reserved capability */
-			ehci_warn (ehci, "illegal capability!\n");
-			cap = 0;
-			/* FALLTHROUGH */
-		default:		/* unknown */
-			break;
-		}
-		temp = (cap >> 8) & 0xff;
-	}
-	if (!count) {
-		ehci_err (ehci, "bogus capabilities ... PCI problems!\n");
-		return -EIO;
-	}
-	if (ehci_is_TDI(ehci))
-		ehci_reset (ehci);
-#endif
-
-	ehci_port_power (ehci, 0);
-
-	/* at least the Genesys GL880S needs fixup here */
-	temp = HCS_N_CC(ehci->hcs_params) * HCS_N_PCC(ehci->hcs_params);
-	temp &= 0x0f;
-	if (temp && HCS_N_PORTS(ehci->hcs_params) > temp) {
-		ehci_dbg (ehci, "bogus port configuration: "
-			"cc=%d x pcc=%d < ports=%d\n",
-			HCS_N_CC(ehci->hcs_params),
-			HCS_N_PCC(ehci->hcs_params),
-			HCS_N_PORTS(ehci->hcs_params));
-
-#ifdef	CONFIG_PCI
-		if (hcd->self.controller->bus == &pci_bus_type) {
-			struct pci_dev	*pdev;
-
-			pdev = to_pci_dev(hcd->self.controller);
-			switch (pdev->vendor) {
-			case 0x17a0:		/* GENESYS */
-				/* GL880S: should be PORTS=2 */
-				temp |= (ehci->hcs_params & ~0xf);
-				ehci->hcs_params = temp;
-				break;
-			case PCI_VENDOR_ID_NVIDIA:
-				/* NF4: should be PCC=10 */
-				break;
-			}
-		}
-#endif
-	}
-
-	/* force HC to halt state */
-	return ehci_halt (ehci);
+	/* the IO watchdog guards against hardware or driver bugs that
+	 * misplace IRQs, and should let us run completely without IRQs.
+	 * such lossage has been observed on both VT6202 and VT8235.
+	 */
+	if (HC_IS_RUNNING (ehci_to_hcd(ehci)->state) &&
+			(ehci->async->qh_next.ptr != NULL ||
+			 ehci->periodic_sched != 0))
+		timer_action (ehci, TIMER_IO_WATCHDOG);
 }
 
-static int ehci_start (struct usb_hcd *hcd)
+static void ehci_stop (struct usb_hcd *hcd)
+{
+	struct ehci_hcd		*ehci = hcd_to_ehci (hcd);
+
+	ehci_dbg (ehci, "stop\n");
+
+	/* Turn off port power on all root hub ports. */
+	ehci_port_power (ehci, 0);
+
+	/* no more interrupts ... */
+	del_timer_sync (&ehci->watchdog);
+
+	spin_lock_irq(&ehci->lock);
+	if (HC_IS_RUNNING (hcd->state))
+		ehci_quiesce (ehci);
+
+	ehci_reset (ehci);
+	writel (0, &ehci->regs->intr_enable);
+	spin_unlock_irq(&ehci->lock);
+
+	/* let companion controllers work when we aren't */
+	writel (0, &ehci->regs->configured_flag);
+	unregister_reboot_notifier (&ehci->reboot_notifier);
+
+	remove_debug_files (ehci);
+
+	/* root hub is shut down separately (first, when possible) */
+	spin_lock_irq (&ehci->lock);
+	if (ehci->async)
+		ehci_work (ehci, NULL);
+	spin_unlock_irq (&ehci->lock);
+	ehci_mem_cleanup (ehci);
+
+#ifdef	EHCI_STATS
+	ehci_dbg (ehci, "irq normal %ld err %ld reclaim %ld (lost %ld)\n",
+		ehci->stats.normal, ehci->stats.error, ehci->stats.reclaim,
+		ehci->stats.lost_iaa);
+	ehci_dbg (ehci, "complete %ld unlink %ld\n",
+		ehci->stats.complete, ehci->stats.unlink);
+#endif
+
+	dbg_status (ehci, "ehci_stop completed", readl (&ehci->regs->status));
+}
+
+static int ehci_run (struct usb_hcd *hcd)
 {
 	struct ehci_hcd		*ehci = hcd_to_ehci (hcd);
 	u32			temp;
 	int			retval;
 	u32			hcc_params;
-	u8                      sbrn = 0;
 	int			first;
 
 	/* skip some things on restart paths */
···
 		return retval;
 	}
 	writel (ehci->periodic_dma, &ehci->regs->frame_list);
-
-#ifdef	CONFIG_PCI
-	if (hcd->self.controller->bus == &pci_bus_type) {
-		struct pci_dev		*pdev;
-		u16			port_wake;
-
-		pdev = to_pci_dev(hcd->self.controller);
-
-		/* Serial Bus Release Number is at PCI 0x60 offset */
-		pci_read_config_byte(pdev, 0x60, &sbrn);
-
-		/* port wake capability, reported by boot firmware */
-		pci_read_config_word(pdev, 0x62, &port_wake);
-		hcd->can_wakeup = (port_wake & 1) != 0;
-
-		/* help hc dma work well with cachelines */
-		retval = pci_set_mwi(pdev);
-		if (retval)
-			ehci_dbg(ehci, "unable to enable MWI - not fatal.\n");
-	}
-#endif
 
 	/*
 	 * dedicate a qh for the async ring head, since we couldn't unlink
···
 	temp = HC_VERSION(readl (&ehci->caps->hc_capbase));
 	ehci_info (ehci,
 		"USB %x.%x %s, EHCI %x.%02x, driver %s\n",
-		((sbrn & 0xf0)>>4), (sbrn & 0x0f),
+		((ehci->sbrn & 0xf0)>>4), (ehci->sbrn & 0x0f),
 		first ? "initialized" : "restarted",
 		temp >> 8, temp & 0xff, DRIVER_VERSION);
 
···
 		create_debug_files (ehci);
 
 	return 0;
-}
-
-/* always called by thread; normally rmmod */
-
-static void ehci_stop (struct usb_hcd *hcd)
-{
-	struct ehci_hcd		*ehci = hcd_to_ehci (hcd);
-
-	ehci_dbg (ehci, "stop\n");
-
-	/* Turn off port power on all root hub ports. */
-	ehci_port_power (ehci, 0);
-
-	/* no more interrupts ... */
-	del_timer_sync (&ehci->watchdog);
-
-	spin_lock_irq(&ehci->lock);
-	if (HC_IS_RUNNING (hcd->state))
-		ehci_quiesce (ehci);
-
-	ehci_reset (ehci);
-	writel (0, &ehci->regs->intr_enable);
-	spin_unlock_irq(&ehci->lock);
-
-	/* let companion controllers work when we aren't */
-	writel (0, &ehci->regs->configured_flag);
-	unregister_reboot_notifier (&ehci->reboot_notifier);
-
-	remove_debug_files (ehci);
-
-	/* root hub is shut down separately (first, when possible) */
-	spin_lock_irq (&ehci->lock);
-	if (ehci->async)
-		ehci_work (ehci, NULL);
-	spin_unlock_irq (&ehci->lock);
-	ehci_mem_cleanup (ehci);
-
-#ifdef	EHCI_STATS
-	ehci_dbg (ehci, "irq normal %ld err %ld reclaim %ld (lost %ld)\n",
-		ehci->stats.normal, ehci->stats.error, ehci->stats.reclaim,
-		ehci->stats.lost_iaa);
-	ehci_dbg (ehci, "complete %ld unlink %ld\n",
-		ehci->stats.complete, ehci->stats.unlink);
-#endif
-
-	dbg_status (ehci, "ehci_stop completed", readl (&ehci->regs->status));
-}
-
-static int ehci_get_frame (struct usb_hcd *hcd)
-{
-	struct ehci_hcd		*ehci = hcd_to_ehci (hcd);
-	return (readl (&ehci->regs->frame_index) >> 3) % ehci->periodic_size;
-}
-
-/*-------------------------------------------------------------------------*/
-
-#ifdef	CONFIG_PM
-
-/* suspend/resume, section 4.3 */
-
-/* These routines rely on the bus (pci, platform, etc)
- * to handle powerdown and wakeup, and currently also on
- * transceivers that don't need any software attention to set up
- * the right sort of wakeup.  
- */
-
-static int ehci_suspend (struct usb_hcd *hcd, pm_message_t message)
-{
-	struct ehci_hcd		*ehci = hcd_to_ehci (hcd);
-
-	if (time_before (jiffies, ehci->next_statechange))
-		msleep (100);
-
-#ifdef	CONFIG_USB_SUSPEND
-	(void) usb_suspend_device (hcd->self.root_hub);
-#else
-	usb_lock_device (hcd->self.root_hub);
-	(void) ehci_hub_suspend (hcd);
-	usb_unlock_device (hcd->self.root_hub);
-#endif
-
-	// save (PCI) FLADJ in case of Vaux power loss
-	// ... we'd only use it to handle clock skew
-
-	return 0;
-}
-
-static int ehci_resume (struct usb_hcd *hcd)
-{
-	struct ehci_hcd		*ehci = hcd_to_ehci (hcd);
-	unsigned		port;
-	struct usb_device	*root = hcd->self.root_hub;
-	int			retval = -EINVAL;
-
-	// maybe restore (PCI) FLADJ
-
-	if (time_before (jiffies, ehci->next_statechange))
-		msleep (100);
-
-	/* If any port is suspended (or owned by the companion),
-	 * we know we can/must resume the HC (and mustn't reset it).
-	 */
-	for (port = HCS_N_PORTS (ehci->hcs_params); port > 0; ) {
-		u32	status;
-		port--;
-		status = readl (&ehci->regs->port_status [port]);
-		if (!(status & PORT_POWER))
-			continue;
-		if (status & (PORT_SUSPEND | PORT_OWNER)) {
-			down (&hcd->self.root_hub->serialize);
-			retval = ehci_hub_resume (hcd);
-			up (&hcd->self.root_hub->serialize);
-			break;
-		}
-		if (!root->children [port])
-			continue;
-		dbg_port (ehci, __FUNCTION__, port + 1, status);
-		usb_set_device_state (root->children[port],
-					USB_STATE_NOTATTACHED);
-	}
-
-	/* Else reset, to cope with power loss or flush-to-storage
-	 * style "resume" having activated BIOS during reboot.
-	 */
-	if (port == 0) {
-		(void) ehci_halt (ehci);
-		(void) ehci_reset (ehci);
-		(void) ehci_hc_reset (hcd);
-
-		/* emptying the schedule aborts any urbs */
-		spin_lock_irq (&ehci->lock);
-		if (ehci->reclaim)
-			ehci->reclaim_ready = 1;
-		ehci_work (ehci, NULL);
-		spin_unlock_irq (&ehci->lock);
-
-		/* restart; khubd will disconnect devices */
-		retval = ehci_start (hcd);
-
-		/* here we "know" root ports should always stay powered;
-		 * but some controllers may lose all power.
-		 */
-		ehci_port_power (ehci, 1);
-	}
-
-	return retval;
-}
-
-#endif
-
-/*-------------------------------------------------------------------------*/
-
-/*
- * ehci_work is called from some interrupts, timers, and so on.
- * it calls driver completion functions, after dropping ehci->lock.
- */
-static void ehci_work (struct ehci_hcd *ehci, struct pt_regs *regs)
-{
-	timer_action_done (ehci, TIMER_IO_WATCHDOG);
-	if (ehci->reclaim_ready)
-		end_unlink_async (ehci, regs);
-
-	/* another CPU may drop ehci->lock during a schedule scan while
-	 * it reports urb completions.  this flag guards against bogus
-	 * attempts at re-entrant schedule scanning.
-	 */
-	if (ehci->scanning)
-		return;
-	ehci->scanning = 1;
-	scan_async (ehci, regs);
-	if (ehci->next_uframe != -1)
-		scan_periodic (ehci, regs);
-	ehci->scanning = 0;
-
-	/* the IO watchdog guards against hardware or driver bugs that
-	 * misplace IRQs, and should let us run completely without IRQs.
-	 * such lossage has been observed on both VT6202 and VT8235. 
-	 */
-	if (HC_IS_RUNNING (ehci_to_hcd(ehci)->state) &&
-			(ehci->async->qh_next.ptr != NULL ||
-			 ehci->periodic_sched != 0))
-		timer_action (ehci, TIMER_IO_WATCHDOG);
 }
 
 /*-------------------------------------------------------------------------*/
···
 	return;
 }
 
-/*-------------------------------------------------------------------------*/
-
-static const struct hc_driver ehci_driver = {
-	.description =		hcd_name,
-	.product_desc =		"EHCI Host Controller",
-	.hcd_priv_size =	sizeof(struct ehci_hcd),
-
-	/*
-	 * generic hardware linkage
-	 */
-	.irq =			ehci_irq,
-	.flags =		HCD_MEMORY | HCD_USB2,
-
-	/*
-	 * basic lifecycle operations
-	 */
-	.reset =		ehci_hc_reset,
-	.start =		ehci_start,
-#ifdef	CONFIG_PM
-	.suspend =		ehci_suspend,
-	.resume =		ehci_resume,
-#endif
-	.stop =			ehci_stop,
-
-	/*
-	 * managing i/o requests and associated device resources
-	 */
-	.urb_enqueue =		ehci_urb_enqueue,
-	.urb_dequeue =		ehci_urb_dequeue,
-	.endpoint_disable =	ehci_endpoint_disable,
-
-	/*
-	 * scheduling support
-	 */
-	.get_frame_number =	ehci_get_frame,
-
-	/*
-	 * root hub support
-	 */
-	.hub_status_data =	ehci_hub_status_data,
-	.hub_control =		ehci_hub_control,
-	.hub_suspend =		ehci_hub_suspend,
-	.hub_resume =		ehci_hub_resume,
-};
+static int ehci_get_frame (struct usb_hcd *hcd)
+{
+	struct ehci_hcd		*ehci = hcd_to_ehci (hcd);
+	return (readl (&ehci->regs->frame_index) >> 3) % ehci->periodic_size;
+}
 
 /*-------------------------------------------------------------------------*/
-
-/* EHCI 1.0 doesn't require PCI */
-
-#ifdef	CONFIG_PCI
-
-/* PCI driver selection metadata; PCI hotplugging uses this */
-static const struct pci_device_id pci_ids [] = { {
-	/* handle any USB 2.0 EHCI controller */
-	PCI_DEVICE_CLASS(((PCI_CLASS_SERIAL_USB << 8) | 0x20), ~0),
-	.driver_data =	(unsigned long) &ehci_driver,
-	},
-	{ /* end: all zeroes */ }
-};
-MODULE_DEVICE_TABLE (pci, pci_ids);
-
-/* pci driver glue; this is a "new style" PCI driver module */
-static struct pci_driver ehci_pci_driver = {
-	.name =		(char *) hcd_name,
-	.id_table =	pci_ids,
-
-	.probe =	usb_hcd_pci_probe,
-	.remove =	usb_hcd_pci_remove,
-
-#ifdef	CONFIG_PM
-	.suspend =	usb_hcd_pci_suspend,
-	.resume =	usb_hcd_pci_resume,
-#endif
-};
-
-#endif	/* PCI */
-
 
 #define DRIVER_INFO DRIVER_VERSION " " DRIVER_DESC
 
···
 MODULE_AUTHOR (DRIVER_AUTHOR);
 MODULE_LICENSE ("GPL");
 
-static int __init init (void) 
-{
-	if (usb_disabled())
-		return -ENODEV;
+#ifdef CONFIG_PCI
+#include "ehci-pci.c"
+#endif
 
-	pr_debug ("%s: block sizes: qh %Zd qtd %Zd itd %Zd sitd %Zd\n",
-		hcd_name,
-		sizeof (struct ehci_qh), sizeof (struct ehci_qtd),
-		sizeof (struct ehci_itd), sizeof (struct ehci_sitd));
-
-	return pci_register_driver (&ehci_pci_driver);
-}
-module_init (init);
-
-static void __exit cleanup (void) 
-{	
-	pci_unregister_driver (&ehci_pci_driver);
-}
-module_exit (cleanup);
+#if !defined(CONFIG_PCI)
+#error "missing bus glue for ehci-hcd"
+#endif

drivers/usb/host/ehci-pci.c

···
+/*
+ * EHCI HCD (Host Controller Driver) PCI Bus Glue.
+ *
+ * Copyright (c) 2000-2004 by David Brownell
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef CONFIG_PCI
+#error "This file is PCI bus glue.  CONFIG_PCI must be defined."
+#endif
+
+/*-------------------------------------------------------------------------*/
+
+/* EHCI 0.96 (and later) section 5.1 says how to kick BIOS/SMM/...
+ * off the controller (maybe it can boot from highspeed USB disks).
+ */
+static int bios_handoff (struct ehci_hcd *ehci, int where, u32 cap)
+{
+	struct pci_dev *pdev = to_pci_dev(ehci_to_hcd(ehci)->self.controller);
+
+	/* always say Linux will own the hardware */
+	pci_write_config_byte(pdev, where + 3, 1);
+
+	/* maybe wait a while for BIOS to respond */
+	if (cap & (1 << 16)) {
+		int msec = 5000;
+
+		do {
+			msleep(10);
+			msec -= 10;
+			pci_read_config_dword(pdev, where, &cap);
+		} while ((cap & (1 << 16)) && msec);
+		if (cap & (1 << 16)) {
+			ehci_err(ehci, "BIOS handoff failed (%d, %08x)\n",
+				where, cap);
+			// some BIOS versions seem buggy...
+			// return 1;
+			ehci_warn (ehci, "continuing after BIOS bug...\n");
+			/* disable all SMIs, and clear "BIOS owns" flag */
+			pci_write_config_dword(pdev, where + 4, 0);
+			pci_write_config_byte(pdev, where + 2, 0);
+		} else
+			ehci_dbg(ehci, "BIOS handoff succeeded\n");
+	}
+	return 0;
+}
+
+/* called by khubd or root hub init threads */
+static int ehci_pci_reset (struct usb_hcd *hcd)
+{
+	struct ehci_hcd		*ehci = hcd_to_ehci (hcd);
+	u32			temp;
+	unsigned		count = 256/4;
+
+	spin_lock_init (&ehci->lock);
+
+	ehci->caps = hcd->regs;
+	ehci->regs = hcd->regs + HC_LENGTH (readl (&ehci->caps->hc_capbase));
+	dbg_hcs_params (ehci, "reset");
+	dbg_hcc_params (ehci, "reset");
+
+	/* cache this readonly data; minimize chip reads */
+	ehci->hcs_params = readl (&ehci->caps->hcs_params);
+
+	if (hcd->self.controller->bus == &pci_bus_type) {
+		struct pci_dev	*pdev = to_pci_dev(hcd->self.controller);
+
+		switch (pdev->vendor) {
+		case PCI_VENDOR_ID_TDI:
+			if (pdev->device == PCI_DEVICE_ID_TDI_EHCI) {
+				ehci->is_tdi_rh_tt = 1;
+				tdi_reset (ehci);
+			}
+			break;
+		case PCI_VENDOR_ID_AMD:
+			/* AMD8111 EHCI doesn't work, according to AMD errata */
+			if (pdev->device == 0x7463) {
+				ehci_info (ehci, "ignoring AMD8111 (errata)\n");
+				return -EIO;
+			}
+			break;
+		case PCI_VENDOR_ID_NVIDIA:
+			/* NVidia reports that certain chips don't handle
+			 * QH, ITD, or SITD addresses above 2GB.  (But TD,
+			 * data buffer, and periodic schedule are normal.)
+			 */
+			switch (pdev->device) {
+			case 0x003c:	/* MCP04 */
+			case 0x005b:	/* CK804 */
+			case 0x00d8:	/* CK8 */
+			case 0x00e8:	/* CK8S */
+				if (pci_set_consistent_dma_mask(pdev,
+							DMA_31BIT_MASK) < 0)
+					ehci_warn (ehci, "can't enable NVidia "
+						"workaround for >2GB RAM\n");
+				break;
+			}
+			break;
+		}
+
+		/* optional debug port, normally in the first BAR */
+		temp = pci_find_capability (pdev, 0x0a);
+		if (temp) {
+			pci_read_config_dword(pdev, temp, &temp);
+			temp >>= 16;
+			if ((temp & (3 << 13)) == (1 << 13)) {
+				temp &= 0x1fff;
+				ehci->debug = hcd->regs + temp;
+				temp = readl (&ehci->debug->control);
+				ehci_info (ehci, "debug port %d%s\n",
+					HCS_DEBUG_PORT(ehci->hcs_params),
+					(temp & DBGP_ENABLED)
+						? " IN USE"
+						: "");
+				if (!(temp & DBGP_ENABLED))
+					ehci->debug = NULL;
+			}
+		}
+
+		temp = HCC_EXT_CAPS (readl (&ehci->caps->hcc_params));
+	} else
+		temp = 0;
+
+	/* EHCI 0.96 and later may have "extended capabilities" */
+	while (temp && count--) {
+		u32		cap;
+
+		pci_read_config_dword (to_pci_dev(hcd->self.controller),
+				temp, &cap);
+		ehci_dbg (ehci, "capability %04x at %02x\n", cap, temp);
+		switch (cap & 0xff) {
+		case 1:			/* BIOS/SMM/... handoff */
+			if (bios_handoff (ehci, temp, cap) != 0)
+				return -EOPNOTSUPP;
+			break;
+		case 0:			/* illegal reserved capability */
+			ehci_warn (ehci, "illegal capability!\n");
+			cap = 0;
+			/* FALLTHROUGH */
+		default:		/* unknown */
+			break;
+		}
+		temp = (cap >> 8) & 0xff;
+	}
+	if (!count) {
+		ehci_err (ehci, "bogus capabilities ... PCI problems!\n");
+		return -EIO;
+	}
+	if (ehci_is_TDI(ehci))
+		ehci_reset (ehci);
+
+	ehci_port_power (ehci, 0);
+
+	/* at least the Genesys GL880S needs fixup here */
+	temp = HCS_N_CC(ehci->hcs_params) * HCS_N_PCC(ehci->hcs_params);
+	temp &= 0x0f;
+	if (temp && HCS_N_PORTS(ehci->hcs_params) > temp) {
+		ehci_dbg (ehci, "bogus port configuration: "
+			"cc=%d x pcc=%d < ports=%d\n",
+			HCS_N_CC(ehci->hcs_params),
+			HCS_N_PCC(ehci->hcs_params),
+			HCS_N_PORTS(ehci->hcs_params));
+
+		if (hcd->self.controller->bus == &pci_bus_type) {
+			struct pci_dev	*pdev;
+
+			pdev = to_pci_dev(hcd->self.controller);
+			switch (pdev->vendor) {
+			case 0x17a0:		/* GENESYS */
+				/* GL880S: should be PORTS=2 */
+				temp |= (ehci->hcs_params & ~0xf);
+				ehci->hcs_params = temp;
+				break;
+			case PCI_VENDOR_ID_NVIDIA:
+				/* NF4: should be PCC=10 */
+				break;
+			}
+		}
+	}
+
+	/* force HC to halt state */
+	return ehci_halt (ehci);
+}
+
+static int ehci_pci_start (struct usb_hcd *hcd)
+{
+	struct ehci_hcd		*ehci = hcd_to_ehci (hcd);
+	int result = 0;
+
+	if (hcd->self.controller->bus == &pci_bus_type) {
+		struct pci_dev		*pdev;
+		u16			port_wake;
+
+		pdev = to_pci_dev(hcd->self.controller);
+
+		/* Serial Bus Release Number is at PCI 0x60 offset */
+		pci_read_config_byte(pdev, 0x60, &ehci->sbrn);
+
+		/* port wake capability, reported by boot firmware */
+		pci_read_config_word(pdev, 0x62, &port_wake);
+		hcd->can_wakeup = (port_wake & 1) != 0;
+
+		/* help hc dma work well with cachelines */
+		result = pci_set_mwi(pdev);
+		if (result)
+			ehci_dbg(ehci, "unable to enable MWI - not fatal.\n");
+	}
+
+	return ehci_run (hcd);
+}
+
+/* always called by thread; normally rmmod */
+
+static void ehci_pci_stop (struct usb_hcd *hcd)
+{
+	ehci_stop (hcd);
+}
+
+/*-------------------------------------------------------------------------*/
+
+#ifdef	CONFIG_PM
+
+/* suspend/resume, section 4.3 */
+
+/* These routines rely on the bus (pci, platform, etc)
+ * to handle powerdown and wakeup, and currently also on
+ * transceivers that don't need any software attention to set up
+ * the right sort of wakeup.
+ */
+
+static int ehci_pci_suspend (struct usb_hcd *hcd, pm_message_t message)
+{
+	struct ehci_hcd		*ehci = hcd_to_ehci (hcd);
+
+	if (time_before (jiffies, ehci->next_statechange))
+		msleep (100);
+
+#ifdef	CONFIG_USB_SUSPEND
+	(void) usb_suspend_device (hcd->self.root_hub);
+#else
+	usb_lock_device (hcd->self.root_hub);
+	(void) ehci_hub_suspend (hcd);
+	usb_unlock_device (hcd->self.root_hub);
+#endif
+
+	// save (PCI) FLADJ in case of Vaux power loss
+	// ... we'd only use it to handle clock skew
+
+	return 0;
+}
+
+static int ehci_pci_resume (struct usb_hcd *hcd)
+{
+	struct ehci_hcd		*ehci = hcd_to_ehci (hcd);
+	unsigned		port;
+	struct usb_device	*root = hcd->self.root_hub;
+	int			retval = -EINVAL;
+
+	// maybe restore (PCI) FLADJ
+
+	if (time_before (jiffies, ehci->next_statechange))
+		msleep (100);
+
+	/* If any port is suspended (or owned by the companion),
+	 * we know we can/must resume the HC (and mustn't reset it).
+	 */
+	for (port = HCS_N_PORTS (ehci->hcs_params); port > 0; ) {
+		u32	status;
+		port--;
+		status = readl (&ehci->regs->port_status [port]);
+		if (!(status & PORT_POWER))
+			continue;
+		if (status & (PORT_SUSPEND | PORT_OWNER)) {
+			down (&hcd->self.root_hub->serialize);
+			retval = ehci_hub_resume (hcd);
+			up (&hcd->self.root_hub->serialize);
+			break;
+		}
+		if (!root->children [port])
+			continue;
+		dbg_port (ehci, __FUNCTION__, port + 1, status);
+		usb_set_device_state (root->children[port],
+					USB_STATE_NOTATTACHED);
+	}
+
+	/* Else reset, to cope with power loss or flush-to-storage
+	 * style "resume" having activated BIOS during reboot.
+	 */
+	if (port == 0) {
+		(void) ehci_halt (ehci);
+		(void) ehci_reset (ehci);
+		(void) ehci_pci_reset (hcd);
+
+		/* emptying the schedule aborts any urbs */
+		spin_lock_irq (&ehci->lock);
+		if (ehci->reclaim)
+			ehci->reclaim_ready = 1;
+		ehci_work (ehci, NULL);
+		spin_unlock_irq (&ehci->lock);
+
+		/* restart; khubd will disconnect devices */
+		retval = ehci_run (hcd);
+
+		/* here we "know" root ports should always stay powered;
+		 * but some controllers may lose all power.
+		 */
+		ehci_port_power (ehci, 1);
+	}
+
+	return retval;
+}
+#endif
+
+static const struct hc_driver ehci_pci_hc_driver = {
+	.description =		hcd_name,
+	.product_desc =		"EHCI Host Controller",
+	.hcd_priv_size =	sizeof(struct ehci_hcd),
+
+	/*
+	 * generic hardware linkage
+	 */
+	.irq =			ehci_irq,
+	.flags =		HCD_MEMORY | HCD_USB2,
+
+	/*
+	 * basic lifecycle operations
+	 */
+	.reset =		ehci_pci_reset,
+	.start =		ehci_pci_start,
+#ifdef	CONFIG_PM
+	.suspend =		ehci_pci_suspend,
+	.resume =		ehci_pci_resume,
+#endif
+	.stop =			ehci_pci_stop,
+
+	/*
+	 * managing i/o requests and associated device resources
+	 */
+	.urb_enqueue =		ehci_urb_enqueue,
+	.urb_dequeue =		ehci_urb_dequeue,
+	.endpoint_disable =	ehci_endpoint_disable,
+
+	/*
+	 * scheduling support
+	 */
+	.get_frame_number =	ehci_get_frame,
+
+	/*
+	 * root hub support
+	 */
+	.hub_status_data =	ehci_hub_status_data,
+	.hub_control =		ehci_hub_control,
+	.hub_suspend =		ehci_hub_suspend,
+	.hub_resume =		ehci_hub_resume,
+};
+
+/*-------------------------------------------------------------------------*/
+
+/* PCI driver selection metadata; PCI hotplugging uses this */
+static const struct pci_device_id pci_ids [] = { {
+	/* handle any USB 2.0 EHCI controller */
+	PCI_DEVICE_CLASS(((PCI_CLASS_SERIAL_USB << 8) | 0x20), ~0),
+	.driver_data =	(unsigned long) &ehci_pci_hc_driver,
+	},
+	{ /* end: all zeroes */ }
+};
+MODULE_DEVICE_TABLE (pci, pci_ids);
+
+/* pci driver glue; this is a "new style" PCI driver module */
+static struct pci_driver ehci_pci_driver = {
+	.name =		(char *) hcd_name,
+	.id_table =	pci_ids,
+
+	.probe =	usb_hcd_pci_probe,
+	.remove =	usb_hcd_pci_remove,
+
+#ifdef	CONFIG_PM
+	.suspend =	usb_hcd_pci_suspend,
+	.resume =	usb_hcd_pci_resume,
+#endif
+};
+
+static int __init ehci_hcd_pci_init (void)
+{
+	if (usb_disabled())
+		return -ENODEV;
+
+	pr_debug ("%s: block sizes: qh %Zd qtd %Zd itd %Zd sitd %Zd\n",
+		hcd_name,
+		sizeof (struct ehci_qh), sizeof (struct ehci_qtd),
+		sizeof (struct ehci_itd), sizeof (struct ehci_sitd));
+
+	return pci_register_driver (&ehci_pci_driver);
+}
+module_init (ehci_hcd_pci_init);
+
+static void __exit ehci_hcd_pci_cleanup (void)
+{
+	pci_unregister_driver (&ehci_pci_driver);
+}
+module_exit (ehci_hcd_pci_cleanup);

drivers/usb/host/ehci.h

···
 #else
 #	define COUNT(x) do {} while (0)
 #endif
+	u8			sbrn;		/* packed release number */
 };
 
 /* convert between an HCD pointer and the corresponding EHCI_HCD */