This patch adds support for big endian GRUSBHC UHCI controllers.
The HCD bus glue will probe the register interface to determine
the endianness of the controller.
Tested on GR-LEON4-ITX board which has a controller with little endian
interface and on custom LEON3 board with a BE controller.
Signed-off-by: Jan Andersson <jan@xxxxxxxxxxx>
---
Changes for V4:
* Do not define arch-specific read/write functions
Changes for V3:
* Updated added comment
* Fixed number of zeros in example after comment from Sergei Shtylyov
Changes for V2:
Updated added comment in uhci-grlib.c
Assign uhci->big_endian_mmio instead of function pointers
---
drivers/usb/host/Kconfig | 6 ++++--
drivers/usb/host/uhci-grlib.c | 16 ++++++++++++++++
2 files changed, 20 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index 5844248..ab085f1 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -418,11 +418,13 @@ config USB_UHCI_SUPPORT_NON_PCI_HC
config USB_UHCI_BIG_ENDIAN_MMIO
bool
- depends on USB_UHCI_SUPPORT_NON_PCI_HC
+ depends on USB_UHCI_SUPPORT_NON_PCI_HC && SPARC_LEON
+ default y
config USB_UHCI_BIG_ENDIAN_DESC
bool
- depends on USB_UHCI_SUPPORT_NON_PCI_HC
+ depends on USB_UHCI_SUPPORT_NON_PCI_HC && SPARC_LEON
+ default y
config USB_FHCI_HCD
tristate "Freescale QE USB Host Controller support"
diff --git a/drivers/usb/host/uhci-grlib.c b/drivers/usb/host/uhci-grlib.c
index b1addd6..6519b84 100644
--- a/drivers/usb/host/uhci-grlib.c
+++ b/drivers/usb/host/uhci-grlib.c
@@ -25,6 +25,22 @@ static int uhci_grlib_init(struct usb_hcd *hcd)
{
struct uhci_hcd *uhci = hcd_to_uhci(hcd);
+ /* Probe to see if we have a big or little endian controller. Bit 7
+ * of PORTSC is always 1 and 15:13 are always zero, so we have:
+ *
+ * 1------- 000----- -------- 000----- => Little endian mode HC
+ * 000----- 1------- 000----- -------- => Big endian mode HC
+ *
+ * We also need to take into account that readl will byte swap.
+ *
+ * If we detect a big endian register interface we also assume that
+ * the controller uses big endian descriptors.
+ */
+ if (!(uhci_readl(uhci, USBPORTSC1) & 0x80)) {
+ uhci->big_endian_mmio = 1;
+ uhci->big_endian_desc = 1;
+ }
+
uhci->rh_numports = uhci_count_ports(hcd);
/* Set up pointers to to generic functions */
--
1.7.0.4
--
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