diff options
Diffstat (limited to 'sys/dev/usb/controller/xhci.h')
| -rw-r--r-- | sys/dev/usb/controller/xhci.h | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/sys/dev/usb/controller/xhci.h b/sys/dev/usb/controller/xhci.h index a675855..d0f278c 100644 --- a/sys/dev/usb/controller/xhci.h +++ b/sys/dev/usb/controller/xhci.h @@ -320,11 +320,23 @@ struct xhci_dev_endpoint_trbs { XHCI_MAX_TRANSFERS) + XHCI_MAX_STREAMS]; }; -#define XHCI_TD_PAGE_NBUF 17 /* units, room enough for 64Kbytes */ -#define XHCI_TD_PAGE_SIZE 4096 /* bytes */ -#define XHCI_TD_PAYLOAD_MAX (XHCI_TD_PAGE_SIZE * (XHCI_TD_PAGE_NBUF - 1)) +#if (USB_PAGE_SIZE < 4096) +#error "The XHCI driver needs a pagesize above 4K" +#endif + +/* Define the maximum payload which we will handle in a single TRB */ +#define XHCI_TD_PAYLOAD_MAX 65536 /* bytes */ + +/* Define the maximum payload of a single scatter-gather list element */ +#define XHCI_TD_PAGE_SIZE \ + ((USB_PAGE_SIZE < XHCI_TD_PAYLOAD_MAX) ? USB_PAGE_SIZE : XHCI_TD_PAYLOAD_MAX) + +/* Define the maximum length of the scatter-gather list */ +#define XHCI_TD_PAGE_NBUF \ + (((XHCI_TD_PAYLOAD_MAX + XHCI_TD_PAGE_SIZE - 1) / XHCI_TD_PAGE_SIZE) + 1) struct xhci_td { + /* one LINK TRB has been added to the TRB array */ struct xhci_trb td_trb[XHCI_TD_PAGE_NBUF + 1]; /* |
