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>
diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h
index e9ba8e2..d0792f5 100644
--- a/drivers/usb/host/ehci.h
+++ b/drivers/usb/host/ehci.h
@@ -128,6 +128,7 @@
unsigned has_fsl_port_bug:1; /* FreeScale */
unsigned big_endian_mmio:1;
unsigned big_endian_desc:1;
+ unsigned big_endian_capbase:1;
unsigned has_amcc_usb23:1;
unsigned need_io_watchdog:1;
unsigned broken_periodic:1;
@@ -605,12 +606,18 @@
* This attempts to support either format at compile time without a
* runtime penalty, or both formats with the additional overhead
* of checking a flag bit.
+ *
+ * ehci_big_endian_capbase is a special quirk for controllers that
+ * implement the HC capability registers as separate registers and not
+ * as fields of a 32-bit register.
*/
#ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
#define ehci_big_endian_mmio(e) ((e)->big_endian_mmio)
+#define ehci_big_endian_capbase(e) ((e)->big_endian_capbase)
#else
#define ehci_big_endian_mmio(e) 0
+#define ehci_big_endian_capbase(e) 0
#endif
/*