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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.h
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.h')
-rw-r--r--drivers/usb/host/ohci.h13
1 files changed, 6 insertions, 7 deletions
diff --git a/drivers/usb/host/ohci.h b/drivers/usb/host/ohci.h
index dd4d5b4dcb6..47c5c66a282 100644
--- a/drivers/usb/host/ohci.h
+++ b/drivers/usb/host/ohci.h
@@ -398,6 +398,7 @@ struct ohci_hcd {
#define OHCI_QUIRK_BE_MMIO 0x10 /* BE registers */
#define OHCI_QUIRK_ZFMICRO 0x20 /* Compaq ZFMicro chipset*/
#define OHCI_QUIRK_NEC 0x40 /* lost interrupts */
+#define OHCI_QUIRK_FRAME_NO 0x80 /* no big endian frame_no shift */
// there are also chip quirks/bugs in init logic
struct work_struct nec_work; /* Worker for NEC quirk */
@@ -633,15 +634,12 @@ static inline u32 hc32_to_cpup (const struct ohci_hcd *ohci, const __hc32 *x)
/* HCCA frame number is 16 bits, but is accessed as 32 bits since not all
* hardware handles 16 bit reads. That creates a different confusion on
* some big-endian SOC implementations. Same thing happens with PSW access.
- *
- * FIXME: Deal with that as a runtime quirk when STB03xxx is ported over
- * to arch/powerpc
*/
-#ifdef CONFIG_STB03xxx
-#define OHCI_BE_FRAME_NO_SHIFT 16
+#ifdef CONFIG_PPC_MPC52xx
+#define big_endian_frame_no_quirk(ohci) (ohci->flags & OHCI_QUIRK_FRAME_NO)
#else
-#define OHCI_BE_FRAME_NO_SHIFT 0
+#define big_endian_frame_no_quirk(ohci) 0
#endif
static inline u16 ohci_frame_no(const struct ohci_hcd *ohci)
@@ -649,7 +647,8 @@ static inline u16 ohci_frame_no(const struct ohci_hcd *ohci)
u32 tmp;
if (big_endian_desc(ohci)) {
tmp = be32_to_cpup((__force __be32 *)&ohci->hcca->frame_no);
- tmp >>= OHCI_BE_FRAME_NO_SHIFT;
+ if (!big_endian_frame_no_quirk(ohci))
+ tmp >>= 16;
} else
tmp = le32_to_cpup((__force __le32 *)&ohci->hcca->frame_no);