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Allow systems having a page size greater than 4K to use fewer

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scatter-gather XHCI TRB entries for its payload data. The XHCI
controller can handle at least 65536 bytes per scatter-gather list
entry.

MFC after:	1 week
Suggested by:	Kohji Okuno <okuno.kohji@jp.panasonic.com>
This commit is contained in:
Hans Petter Selasky 2014-12-30 09:20:29 +00:00
parent bc59086c88
commit 454035ba1b
1 changed files with 15 additions and 3 deletions
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18
sys/dev/usb/controller/xhci.h
View file

@ -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];
/*