1 files changed, 44 insertions, 1 deletions

diff --git a/drivers/usb/host/ehci-ppc-of.c b/drivers/usb/host/ehci-ppc-of.c
index b018deed2e8f..ef732b704f53 100644
--- a/drivers/usb/host/ehci-ppc-of.c
+++ b/drivers/usb/host/ehci-ppc-of.c
@@ -107,11 +107,13 @@ ehci_hcd_ppc_of_probe(struct of_device *op, const struct of_device_id *match)
 {
 	struct device_node *dn = op->node;
 	struct usb_hcd *hcd;
-	struct ehci_hcd	*ehci;
+	struct ehci_hcd	*ehci = NULL;
 	struct resource res;
 	int irq;
 	int rv;
 
+	struct device_node *np;
+
 	if (usb_disabled())
 		return -ENODEV;
 
@@ -149,6 +151,20 @@ ehci_hcd_ppc_of_probe(struct of_device *op, const struct of_device_id *match)
 	}
 
 	ehci = hcd_to_ehci(hcd);
+	np = of_find_compatible_node(NULL, NULL, "ibm,usb-ohci-440epx");
+	if (np != NULL) {
+		/* claim we really affected by usb23 erratum */
+		if (!of_address_to_resource(np, 0, &res))
+			ehci->ohci_hcctrl_reg = ioremap(res.start +
+					OHCI_HCCTRL_OFFSET, OHCI_HCCTRL_LEN);
+		else
+			pr_debug(__FILE__ ": no ohci offset in fdt\n");
+		if (!ehci->ohci_hcctrl_reg) {
+			pr_debug(__FILE__ ": ioremap for ohci hcctrl failed\n");
+		} else {
+			ehci->has_amcc_usb23 = 1;
+		}
+	}
 
 	if (of_get_property(dn, "big-endian", NULL)) {
 		ehci->big_endian_mmio = 1;
@@ -181,6 +197,9 @@ err_ioremap:
 	irq_dispose_mapping(irq);
 err_irq:
 	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+
+	if (ehci->has_amcc_usb23)
+		iounmap(ehci->ohci_hcctrl_reg);
 err_rmr:
 	usb_put_hcd(hcd);
 
@@ -191,6 +210,11 @@ err_rmr:
 static int ehci_hcd_ppc_of_remove(struct of_device *op)
 {
 	struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
+	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+
+	struct device_node *np;
+	struct resource res;
+
 	dev_set_drvdata(&op->dev, NULL);
 
 	dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n");
@@ -201,6 +225,25 @@ static int ehci_hcd_ppc_of_remove(struct of_device *op)
 	irq_dispose_mapping(hcd->irq);
 	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 
+	/* use request_mem_region to test if the ohci driver is loaded.  if so
+	 * ensure the ohci core is operational.
+	 */
+	if (ehci->has_amcc_usb23) {
+		np = of_find_compatible_node(NULL, NULL, "ibm,usb-ohci-440epx");
+		if (np != NULL) {
+			if (!of_address_to_resource(np, 0, &res))
+				if (!request_mem_region(res.start,
+							    0x4, hcd_name))
+					set_ohci_hcfs(ehci, 1);
+				else
+					release_mem_region(res.start, 0x4);
+			else
+				pr_debug(__FILE__ ": no ohci offset in fdt\n");
+			of_node_put(np);
+		}
+
+		iounmap(ehci->ohci_hcctrl_reg);
+	}
 	usb_put_hcd(hcd);
 
 	return 0;