USB: EHCI: Support controllers with big endian capability regs

The two first HC capability registers (CAPLENGTH and HCIVERSION)
are defined as one 8-bit and one 16-bit register. Most HC
implementations have selected to treat these registers as part
of a 32-bit register, giving the same layout for both big and
small endian systems.

This patch adds a new quirk, big_endian_capbase, to support
controllers with big endian register interfaces that treat
HCIVERSION and CAPLENGTH as individual registers.

Signed-off-by: Jan Andersson <jan@gaisler.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 4 insertions, 4 deletions

diff --git a/drivers/usb/host/ehci-ath79.c b/drivers/usb/host/ehci-ath79.c
index 7ea23b50f5d8..98cc8a13169c 100644
--- a/drivers/usb/host/ehci-ath79.c
+++ b/drivers/usb/host/ehci-ath79.c
@@ -44,6 +44,7 @@ static int ehci_ath79_init(struct usb_hcd *hcd)
         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
         struct platform_device *pdev = to_platform_device(hcd->self.controller);
         const struct platform_device_id *id;
+        int hclength;
         int ret;
 
         id = platform_get_device_id(pdev);
@@ -52,21 +53,20 @@ static int ehci_ath79_init(struct usb_hcd *hcd)
                 return -EINVAL;
         }
 
+        hclength = HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
         switch (id->driver_data) {
         case EHCI_ATH79_IP_V1:
                 ehci->has_synopsys_hc_bug = 1;
 
                 ehci->caps = hcd->regs;
-                ehci->regs = hcd->regs +
-                        HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
+                ehci->regs = hcd->regs + hclength;
                 break;
 
         case EHCI_ATH79_IP_V2:
                 hcd->has_tt = 1;
 
                 ehci->caps = hcd->regs + 0x100;
-                ehci->regs = hcd->regs + 0x100 +
-                        HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
+                ehci->regs = hcd->regs + 0x100 + hclength;
                 break;
 
         default: