tree 55fc6d2955f6e8cfb0b452c24c33b4a47225a5d4
parent 482af6d15ca8eed28b51edc11692815419326d65
author Nico Huber <nico.huber@secunet.com> 1370506835 +0200
committer Stefan Reinauer <stefan.reinauer@coreboot.org> 1371154599 +0200

libpayload: usb: Add interval attribute to endpoints

Read bInterval from endpoint descriptors and store it in our endpoint_t
struct. The interval is encoded dependently on the device' speed and the
endpoint's type. Therefore, it will be normalized to the binary logarithm
of the number of microframes, i.e.
  t = 125us * 2^interval

The interval attribute will be used in the xHCI driver.

Change-Id: I65a8eda6145faf34666800789f0292e640a8141b
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: http://review.coreboot.org/3449
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>