diff options
| author | Michael Brown <mcb30@ipxe.org> | 2015-02-12 15:14:04 +0000 |
|---|---|---|
| committer | Michael Brown <mcb30@ipxe.org> | 2015-02-13 01:10:51 +0000 |
| commit | 17fc79425ef27f508cf8527c2adf160cef1888c8 (patch) | |
| tree | aa05c85ced9448237b52c3c5c44cb0ffbbc83199 /src/include/ipxe/usb.h | |
| parent | 5de134662d3ca9245473a88849d4af770a55e994 (diff) | |
| download | ipxe-17fc79425ef27f508cf8527c2adf160cef1888c8.tar.gz | |
[usb] Provide generic framework for refilling receive endpoints
Provide a generic framework for allocating, refilling, and optionally
recycling I/O buffers used by bulk IN and interrupt endpoints.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Diffstat (limited to 'src/include/ipxe/usb.h')
| -rw-r--r-- | src/include/ipxe/usb.h | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/src/include/ipxe/usb.h b/src/include/ipxe/usb.h index 8e1824160..63358024d 100644 --- a/src/include/ipxe/usb.h +++ b/src/include/ipxe/usb.h @@ -379,6 +379,8 @@ struct usb_endpoint { int open; /** Current failure state (if any) */ int rc; + /** Buffer fill level */ + unsigned int fill; /** Host controller operations */ struct usb_endpoint_host_operations *host; @@ -386,6 +388,13 @@ struct usb_endpoint { void *priv; /** Driver operations */ struct usb_endpoint_driver_operations *driver; + + /** Recycled I/O buffer list */ + struct list_head recycled; + /** Refill buffer length */ + size_t len; + /** Maximum fill level */ + unsigned int max; }; /** USB endpoint host controller operations */ @@ -554,6 +563,37 @@ extern void usb_complete_err ( struct usb_endpoint *ep, struct io_buffer *iobuf, int rc ); /** + * Initialise USB endpoint refill + * + * @v ep USB endpoint + * @v len Refill buffer length (or zero to use endpoint's MTU) + * @v max Maximum fill level + */ +static inline __attribute__ (( always_inline )) void +usb_refill_init ( struct usb_endpoint *ep, size_t len, unsigned int max ) { + + INIT_LIST_HEAD ( &ep->recycled ); + ep->len = len; + ep->max = max; +} + +/** + * Recycle I/O buffer + * + * @v ep USB endpoint + * @v iobuf I/O buffer + */ +static inline __attribute__ (( always_inline )) void +usb_recycle ( struct usb_endpoint *ep, struct io_buffer *iobuf ) { + + list_add_tail ( &iobuf->list, &ep->recycled ); +} + +extern int usb_prefill ( struct usb_endpoint *ep ); +extern int usb_refill ( struct usb_endpoint *ep ); +extern void usb_flush ( struct usb_endpoint *ep ); + +/** * A USB function * * A USB function represents an association of interfaces within a USB |