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authorValentine Barshak <vbarshak@ru.mvista.com>2007-10-09 15:00:05 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2007-10-12 14:55:32 -0700
commit4f45426cfd6170311e116442ccd8ce0e31979237 (patch)
treed62325f3cf5261230f7d4423603665c9b5adbc01 /drivers/usb/host/ohci-ppc-soc.c
parentf621b8437d6ae502dde45797f56407e48c7a68b4 (diff)
USB: add runtime frame_no quirk for big-endian OHCI
Add OHCI big endian frame_no quirk. The frame_no value stored in the HCCA is a 16 bit field at a specific offset, but since not all CPUs can do 16-bit memory accesses it's used as a 32 bit field. And that's why big-endian OHCI must shift 16 bits ... unless the spec is not followed. Currently there's one MPC52xx platform that doesn't need the shift. This patch adds a new "big endian frame_no" quirk to control that at runtime. Signed-off-by: Valentine Barshak <vbarshak@ru.mvista.com> Acked-by: Dale Farnsworth <dale@farnsworth.org> Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/host/ohci-ppc-soc.c')
-rw-r--r--drivers/usb/host/ohci-ppc-soc.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/usb/host/ohci-ppc-soc.c b/drivers/usb/host/ohci-ppc-soc.c
index 1a2e1777ca61..f95be1896b0d 100644
--- a/drivers/usb/host/ohci-ppc-soc.c
+++ b/drivers/usb/host/ohci-ppc-soc.c
@@ -73,6 +73,11 @@ static int usb_hcd_ppc_soc_probe(const struct hc_driver *driver,
ohci = hcd_to_ohci(hcd);
ohci->flags |= OHCI_QUIRK_BE_MMIO | OHCI_QUIRK_BE_DESC;
+
+#ifdef CONFIG_PPC_MPC52xx
+ /* MPC52xx doesn't need frame_no shift */
+ ohci->flags |= OHCI_QUIRK_FRAME_NO;
+#endif
ohci_hcd_init(ohci);
retval = usb_add_hcd(hcd, irq, IRQF_DISABLED);