diff options
Diffstat (limited to 'drivers/usb/host/ehci.h')
| -rw-r--r-- | drivers/usb/host/ehci.h | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h index 74dbc6c8228f..5f28b74bb8d3 100644 --- a/drivers/usb/host/ehci.h +++ b/drivers/usb/host/ehci.h @@ -92,6 +92,7 @@ struct ehci_hcd { /* one per controller */ unsigned is_tdi_rh_tt:1; /* TDI roothub with TT */ unsigned no_selective_suspend:1; unsigned has_fsl_port_bug:1; /* FreeScale */ + unsigned big_endian_mmio:1; u8 sbrn; /* packed release number */ @@ -651,6 +652,37 @@ ehci_port_speed(struct ehci_hcd *ehci, unsigned int portsc) #define ehci_has_fsl_portno_bug(e) (0) #endif +/* + * While most USB host controllers implement their registers in + * little-endian format, a minority (celleb companion chip) implement + * them in big endian format. + * + * 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. + */ + +#ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO +#define ehci_big_endian_mmio(e) ((e)->big_endian_mmio) +#else +#define ehci_big_endian_mmio(e) 0 +#endif + +static inline unsigned int ehci_readl (const struct ehci_hcd *ehci, + __u32 __iomem * regs) +{ + return ehci_big_endian_mmio(ehci) ? + readl_be((__force u32 *)regs) : + readl((__force u32 *)regs); +} + +static inline void ehci_writel (const struct ehci_hcd *ehci, + const unsigned int val, __u32 __iomem *regs) +{ + ehci_big_endian_mmio(ehci) ? + writel_be(val, (__force u32 *)regs) : + writel(val, (__force u32 *)regs); +} /*-------------------------------------------------------------------------*/ |