Author: wmb Date: Tue Dec 6 08:11:02 2011 New Revision: 2738 URL: http://tracker.coreboot.org/trac/openfirmware/changeset/2738
Log: USB - added some access words - currently unused - for the ULPI viewport register.
Added: dev/usb2/hcd/ehci/ulpi.fth
Added: dev/usb2/hcd/ehci/ulpi.fth ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ dev/usb2/hcd/ehci/ulpi.fth Tue Dec 6 08:11:02 2011 (r2738) @@ -0,0 +1,75 @@ +\ See license at end of file +purpose: Support for ULPI Viewports + +\ ULPI is a hardware interface between a USB controller and external PHY. +\ The semantics of the interface mimics that of the UTMI+ hardware interface, +\ but the ULPI interface has fewer pins and is thus better-suited for +\ external PHYs. The UTMI+ interface was optimized for controller and PHY +\ on the same chip. +\ UTMI+ has a number of hardware control signals that change infrequently. +\ ULPI implements those almost-static signals with bits in PHY-resident +\ registers. Typically that is transparent to software, as the ULPI side +\ of the hardware interface does the work of translating the UTMI hardware +\ signaling into register accesses across the ULPI interconnect. However, +\ it is possible to read and write those registers explicitly, e.g. for +\ debugging. The "ULPI Viewport" register in the EHCI register block lets +\ you do that + +\ Low-level access to the viewport registers +: view@ ( -- n ) h# 30 op-reg@ ; +: view! ( -- n ) h# 30 op-reg! ; + +\ Wait for the indicated viewport register bit to go to 0. +: ulpi-poll ( bit -- ) + d# 10000 0 do ( bit ) + dup view@ and if ( bit ) + drop unloop exit ( -- ) + then ( bit ) + d# 5 us ( bit ) + loop ( bit ) + drop true abort" ULPI poll timeout" +; +\ Wakeup the ULPI interface if it is not in "synchronized" state +: ?ulpi-wakeup ( -- ) + view@ h# 0800.0000 and 0= if \ SYNC state + h# 8000.0000 view! \ wakeup + h# 8000.0000 ulpi-poll \ wait for wakeup + then +; +\ Read a register in the ULPI PHY +: ulpi@ ( reg -- n ) + ?ulpi-wakeup ( reg ) + d# 16 lshift h# 4000.0000 or view! ( ) \ address and RUN bit + h# 4000.0000 ulpi-poll ( ) + view@ 8 rshift h# ff and ( n ) +; +\ Write a register in the ULPI PHY +: ulpi! ( n reg -- ) + ?ulpi-wakeup ( n reg ) + d# 16 lshift or h# 4000.0000 or view! ( ) \ address and WRITE bit and RUN bit + h# 4000.0000 ulpi-poll ( ) +; + +\ LICENSE_BEGIN +\ Copyright (c) 2011 FirmWorks +\ +\ Permission is hereby granted, free of charge, to any person obtaining +\ a copy of this software and associated documentation files (the +\ "Software"), to deal in the Software without restriction, including +\ without limitation the rights to use, copy, modify, merge, publish, +\ distribute, sublicense, and/or sell copies of the Software, and to +\ permit persons to whom the Software is furnished to do so, subject to +\ the following conditions: +\ +\ The above copyright notice and this permission notice shall be +\ included in all copies or substantial portions of the Software. +\ +\ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, +\ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +\ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND +\ NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE +\ LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION +\ OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION +\ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. +\ +\ LICENSE_END
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