diff options
Diffstat (limited to 'drivers/usb/host/ehci.h')
| -rw-r--r-- | drivers/usb/host/ehci.h | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h index 12504fbded56..e8f41c5e771b 100644 --- a/drivers/usb/host/ehci.h +++ b/drivers/usb/host/ehci.h @@ -61,6 +61,7 @@ struct ehci_stats { struct ehci_per_sched { struct usb_device *udev; /* access to the TT */ struct usb_host_endpoint *ep; + struct list_head ps_list; /* node on ehci_tt's ps_list */ u16 tt_usecs; /* time on the FS/LS bus */ u16 cs_mask; /* C-mask and S-mask bytes */ u16 period; /* actual period in frames */ @@ -256,6 +257,9 @@ struct ehci_hcd { /* one per controller */ #define EHCI_BANDWIDTH_FRAMES (EHCI_BANDWIDTH_SIZE >> 3) u8 bandwidth[EHCI_BANDWIDTH_SIZE]; /* us allocated per uframe */ + u8 tt_budget[EHCI_BANDWIDTH_SIZE]; + /* us budgeted per uframe */ + struct list_head tt_list; /* platform-specific data -- must come last */ unsigned long priv[0] __aligned(sizeof(s64)); @@ -595,6 +599,35 @@ struct ehci_fstn { /*-------------------------------------------------------------------------*/ +/* + * USB-2.0 Specification Sections 11.14 and 11.18 + * Scheduling and budgeting split transactions using TTs + * + * A hub can have a single TT for all its ports, or multiple TTs (one for each + * port). The bandwidth and budgeting information for the full/low-speed bus + * below each TT is self-contained and independent of the other TTs or the + * high-speed bus. + * + * "Bandwidth" refers to the number of microseconds on the FS/LS bus allocated + * to an interrupt or isochronous endpoint for each frame. "Budget" refers to + * the best-case estimate of the number of full-speed bytes allocated to an + * endpoint for each microframe within an allocated frame. + * + * Removal of an endpoint invalidates a TT's budget. Instead of trying to + * keep an up-to-date record, we recompute the budget when it is needed. + */ + +struct ehci_tt { + u16 bandwidth[EHCI_BANDWIDTH_FRAMES]; + + struct list_head tt_list; /* List of all ehci_tt's */ + struct list_head ps_list; /* Items using this TT */ + struct usb_tt *usb_tt; + int tt_port; /* TT port number */ +}; + +/*-------------------------------------------------------------------------*/ + /* Prepare the PORTSC wakeup flags during controller suspend/resume */ #define ehci_prepare_ports_for_controller_suspend(ehci, do_wakeup) \ |