diff options
Diffstat (limited to 'drivers/usb/host/xhci.h')
| -rw-r--r-- | drivers/usb/host/xhci.h | 41 |
1 files changed, 29 insertions, 12 deletions
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h index f8416639bf31..58ed9d088e63 100644 --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -28,17 +28,6 @@ #include <linux/kernel.h> #include <linux/usb/hcd.h> -/* - * Registers should always be accessed with double word or quad word accesses. - * - * Some xHCI implementations may support 64-bit address pointers. Registers - * with 64-bit address pointers should be written to with dword accesses by - * writing the low dword first (ptr[0]), then the high dword (ptr[1]) second. - * xHCI implementations that do not support 64-bit address pointers will ignore - * the high dword, and write order is irrelevant. - */ -#include <asm-generic/io-64-nonatomic-lo-hi.h> - /* Code sharing between pci-quirks and xhci hcd */ #include "xhci-ext-caps.h" #include "pci-quirks.h" @@ -1279,7 +1268,7 @@ union xhci_trb { * since the command ring is 64-byte aligned. * It must also be greater than 16. */ -#define TRBS_PER_SEGMENT 256 +#define TRBS_PER_SEGMENT 64 /* Allow two commands + a link TRB, along with any reserved command TRBs */ #define MAX_RSVD_CMD_TRBS (TRBS_PER_SEGMENT - 3) #define TRB_SEGMENT_SIZE (TRBS_PER_SEGMENT*16) @@ -1614,6 +1603,34 @@ static inline struct usb_hcd *xhci_to_hcd(struct xhci_hcd *xhci) #define xhci_warn_ratelimited(xhci, fmt, args...) \ dev_warn_ratelimited(xhci_to_hcd(xhci)->self.controller , fmt , ## args) +/* + * Registers should always be accessed with double word or quad word accesses. + * + * Some xHCI implementations may support 64-bit address pointers. Registers + * with 64-bit address pointers should be written to with dword accesses by + * writing the low dword first (ptr[0]), then the high dword (ptr[1]) second. + * xHCI implementations that do not support 64-bit address pointers will ignore + * the high dword, and write order is irrelevant. + */ +static inline u64 xhci_read_64(const struct xhci_hcd *xhci, + __le64 __iomem *regs) +{ + __u32 __iomem *ptr = (__u32 __iomem *) regs; + u64 val_lo = readl(ptr); + u64 val_hi = readl(ptr + 1); + return val_lo + (val_hi << 32); +} +static inline void xhci_write_64(struct xhci_hcd *xhci, + const u64 val, __le64 __iomem *regs) +{ + __u32 __iomem *ptr = (__u32 __iomem *) regs; + u32 val_lo = lower_32_bits(val); + u32 val_hi = upper_32_bits(val); + + writel(val_lo, ptr); + writel(val_hi, ptr + 1); +} + static inline int xhci_link_trb_quirk(struct xhci_hcd *xhci) { return xhci->quirks & XHCI_LINK_TRB_QUIRK; |