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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>
This commit is contained in:
Valentine Barshak 2007-10-09 15:00:05 -07:00 committed by Greg Kroah-Hartman
parent f621b8437d
commit 4f45426cfd
3 changed files with 15 additions and 8 deletions
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5
drivers/usb/host/ohci-ppc-of.c
View File

@ -134,8 +134,11 @@ ohci_hcd_ppc_of_probe(struct of_device *op, const struct of_device_id *match)
}
ohci = hcd_to_ohci(hcd);
if (is_bigendian)
if (is_bigendian) {
ohci->flags |= OHCI_QUIRK_BE_MMIO | OHCI_QUIRK_BE_DESC;
if (of_device_is_compatible(dn, "mpc5200-ohci"))
ohci->flags |= OHCI_QUIRK_FRAME_NO;
}
ohci_hcd_init(ohci);

5
drivers/usb/host/ohci-ppc-soc.c
View File

@ -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);

13
drivers/usb/host/ohci.h
View File

@ -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);