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| author | Michael Brown | 2015-03-23 14:34:16 +0100 |
|---|---|---|
| committer | Michael Brown | 2015-03-23 17:23:08 +0100 |
| commit | b418af26d961dd465ce0667575ffc6d82a1a8987 (patch) | |
| tree | 2a1bb351244ede637bbc74e1a64f255ae09f76a6 /src/interface/linux/linux_console.c | |
| parent | [usb] Clear transaction translator buffers when applicable (diff) | |
| download | ipxe-b418af26d961dd465ce0667575ffc6d82a1a8987.tar.gz ipxe-b418af26d961dd465ce0667575ffc6d82a1a8987.tar.xz ipxe-b418af26d961dd465ce0667575ffc6d82a1a8987.zip | |
[ehci] Support USB1 devices attached via transaction translators
Support low-speed and full-speed devices attached to a USB2 hub. Such
devices use a transaction translator (TT) within the USB2 hub, which
asynchronously initiates transactions on the lower-speed bus and
returns the result via a split completion on the high-speed bus.
We make the simplifying assumption that there will never be more than
sixteen active interrupt endpoints behind a single transaction
translator; this assumption allows us to schedule all periodic start
splits in microframe 0 and all periodic split completions in
microframes 2 and 3. (We do not handle isochronous endpoints.)
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Diffstat (limited to 'src/interface/linux/linux_console.c')
0 files changed, 0 insertions, 0 deletions