path: root/drivers/usb/host/isp116x-hcd.c

// SPDX-License-Identifier: GPL-2.0
/*
 * ISP116x HCD (Host Controller Driver) for USB.
 *
 * Derived from the SL811 HCD, rewritten for ISP116x.
 * Copyright (C) 2005 Olav Kongas <ok@artecdesign.ee>
 *
 * Portions:
 * Copyright (C) 2004 Psion Teklogix (for NetBook PRO)
 * Copyright (C) 2004 David Brownell
 *
 * Periodic scheduling is based on Roman's OHCI code
 * Copyright (C) 1999 Roman Weissgaerber
 *
 */

/*
 * The driver basically works. A number of people have used it with a range
 * of devices.
 *
 * The driver passes all usbtests 1-14.
 *
 * Suspending/resuming of root hub via sysfs works. Remote wakeup works too.
 * And suspending/resuming of platform device works too. Suspend/resume
 * via HCD operations vector is not implemented.
 *
 * Iso transfer support is not implemented. Adding this would include
 * implementing recovery from the failure to service the processed ITL
 * fifo ram in time, which will involve chip reset.
 *
 * TODO:
 + More testing of suspend/resume.
*/

/*
  ISP116x chips require certain delays between accesses to its
  registers. The following timing options exist.

  1. Config