ehci: pci quirk cleanup

Factor the handoff code out from quirk_usb_disable_ehci

Signed-off-by: Andy Ross <andy.ross@windriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 66 insertions, 70 deletions

diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c
index 9b166d70ae9..e300509faa6 100644
--- a/drivers/usb/host/pci-quirks.c
+++ b/drivers/usb/host/pci-quirks.c
@@ -503,14 +503,70 @@ static void __devinit quirk_usb_handoff_ohci(struct pci_dev *pdev)
 	iounmap(base);
 }
 
+static void __devinit ehci_bios_handoff(struct pci_dev *pdev,
+					void __iomem *op_reg_base,
+					u32 cap, u8 offset)
+{
+	int msec, tried_handoff = 0;
+
+	if (cap & EHCI_USBLEGSUP_BIOS) {
+		dev_dbg(&pdev->dev, "EHCI: BIOS handoff\n");
+
+#if 0
+/* aleksey_gorelov@phoenix.com reports that some systems need SMI forced on,
+ * but that seems dubious in general (the BIOS left it off intentionally)
+ * and is known to prevent some systems from booting.  so we won't do this
+ * unless maybe we can determine when we're on a system that needs SMI forced.
+ */
+		/* BIOS workaround (?): be sure the pre-Linux code
+		 * receives the SMI
+		 */
+		pci_read_config_dword(pdev, offset + EHCI_USBLEGCTLSTS, &val);
+		pci_write_config_dword(pdev, offset + EHCI_USBLEGCTLSTS,
+				       val | EHCI_USBLEGCTLSTS_SOOE);
+#endif
+
+		/* some systems get upset if this semaphore is
+		 * set for any other reason than forcing a BIOS
+		 * handoff..
+		 */
+		pci_write_config_byte(pdev, offset + 3, 1);
+	}
+
+	/* if boot firmware now owns EHCI, spin till it hands it over. */
+	msec = 1000;
+	while ((cap & EHCI_USBLEGSUP_BIOS) && (msec > 0)) {
+		tried_handoff = 1;
+		msleep(10);
+		msec -= 10;
+		pci_read_config_dword(pdev, offset, &cap);
+	}
+
+	if (cap & EHCI_USBLEGSUP_BIOS) {
+		/* well, possibly buggy BIOS... try to shut it down,
+		 * and hope nothing goes too wrong
+		 */
+		dev_warn(&pdev->dev, "EHCI: BIOS handoff failed"
+			 " (BIOS bug?) %08x\n", cap);
+		pci_write_config_byte(pdev, offset + 2, 0);
+	}
+
+	/* just in case, always disable EHCI SMIs */
+	pci_write_config_dword(pdev, offset + EHCI_USBLEGCTLSTS, 0);
+
+	/* If the BIOS ever owned the controller then we can't expect
+	 * any power sessions to remain intact.
+	 */
+	if (tried_handoff)
+		writel(0, op_reg_base + EHCI_CONFIGFLAG);
+}
+
 static void __devinit quirk_usb_disable_ehci(struct pci_dev *pdev)
 {
-	int wait_time, delta;
 	void __iomem *base, *op_reg_base;
-	u32	hcc_params, val;
+	u32	hcc_params, cap, val;
 	u8	offset, cap_length;
-	int	count = 256/4;
-	int	tried_handoff = 0;
+	int	wait_time, delta, count = 256/4;
 
 	if (!mmio_resource_enabled(pdev, 0))
 		return;
@@ -529,77 +585,17 @@ static void __devinit quirk_usb_disable_ehci(struct pci_dev *pdev)
 	hcc_params = readl(base + EHCI_HCC_PARAMS);
 	offset = (hcc_params >> 8) & 0xff;
 	while (offset && --count) {
-		u32		cap;
-		int		msec;
-
 		pci_read_config_dword(pdev, offset, &cap);
-		switch (cap & 0xff) {
-		case 1:			/* BIOS/SMM/... handoff support */
-			if ((cap & EHCI_USBLEGSUP_BIOS)) {
-				dev_dbg(&pdev->dev, "EHCI: BIOS handoff\n");
-
-#if 0
-/* aleksey_gorelov@phoenix.com reports that some systems need SMI forced on,
- * but that seems dubious in general (the BIOS left it off intentionally)
- * and is known to prevent some systems from booting.  so we won't do this
- * unless maybe we can determine when we're on a system that needs SMI forced.
- */
-				/* BIOS workaround (?): be sure the
-				 * pre-Linux code receives the SMI
-				 */
-				pci_read_config_dword(pdev,
-						offset + EHCI_USBLEGCTLSTS,
-						&val);
-				pci_write_config_dword(pdev,
-						offset + EHCI_USBLEGCTLSTS,
-						val | EHCI_USBLEGCTLSTS_SOOE);
-#endif
-
-				/* some systems get upset if this semaphore is
-				 * set for any other reason than forcing a BIOS
-				 * handoff..
-				 */
-				pci_write_config_byte(pdev, offset + 3, 1);
-			}
-
-			/* if boot firmware now owns EHCI, spin till
-			 * it hands it over.
-			 */
-			msec = 1000;
-			while ((cap & EHCI_USBLEGSUP_BIOS) && (msec > 0)) {
-				tried_handoff = 1;
-				msleep(10);
-				msec -= 10;
-				pci_read_config_dword(pdev, offset, &cap);
-			}
 
-			if (cap & EHCI_USBLEGSUP_BIOS) {
-				/* well, possibly buggy BIOS... try to shut
-				 * it down, and hope nothing goes too wrong
-				 */
-				dev_warn(&pdev->dev, "EHCI: BIOS handoff failed"
-						" (BIOS bug?) %08x\n", cap);
-				pci_write_config_byte(pdev, offset + 2, 0);
-			}
-
-			/* just in case, always disable EHCI SMIs */
-			pci_write_config_dword(pdev,
-					offset + EHCI_USBLEGCTLSTS,
-					0);
-
-			/* If the BIOS ever owned the controller then we
-			 * can't expect any power sessions to remain intact.
-			 */
-			if (tried_handoff)
-				writel(0, op_reg_base + EHCI_CONFIGFLAG);
+		switch (cap & 0xff) {
+		case 1:
+			ehci_bios_handoff(pdev, op_reg_base, cap, offset);
 			break;
-		case 0:			/* illegal reserved capability */
-			cap = 0;
-			/* FALLTHROUGH */
+		case 0: /* Illegal reserved cap, set cap=0 so we exit */
+			cap = 0; /* then fallthrough... */
 		default:
 			dev_warn(&pdev->dev, "EHCI: unrecognized capability "
-					"%02x\n", cap & 0xff);
-			break;
+				 "%02x\n", cap & 0xff);
 		}
 		offset = (cap >> 8) & 0xff;
 	}