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path: root/drivers/usb/host/ehci-ppc-of.c
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Diffstat (limited to 'drivers/usb/host/ehci-ppc-of.c')
-rw-r--r--drivers/usb/host/ehci-ppc-of.c45
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 b018deed2e8..ef732b704f5 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;