| /* |
| * (C) Copyright 2001 |
| * Denis Peter, MPL AG Switzerland |
| * |
| * See file CREDITS for list of people who contributed to this |
| * project. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation; either version 2 of |
| * the License, or (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| * MA 02111-1307 USA |
| * |
| */ |
| |
| USB Support for PIP405 and MIP405 (UHCI) |
| ======================================== |
| |
| The USB support is implemented on the base of the UHCI Host |
| controller. |
| |
| Currently supported are USB Hubs, USB Keyboards and USB Floppys. |
| Tested with a TEAC Floppy TEAC FD-05PUB and Chicony KU-8933 Keyboard. |
| |
| How it works: |
| ------------- |
| |
| The USB (at least the USB UHCI) needs a frame list (4k), transfer |
| descripor and queue headers which are all located in the main memory. |
| The UHCI allocates every milisecond the PCI bus and reads the current |
| frame pointer. This may cause to crash the OS during boot. So the USB |
| _MUST_ be stopped during OS boot. This is the reason, why the USB is |
| NOT automatically started during start-up. If someone needs the USB |
| he has to start it and should therefore be aware that he had to stop |
| it before booting the OS. |
| |
| For USB keyboards this can be done by a script which is automatically |
| started after the U-Boot is up and running. To boot an OS with a an |
| USB keyboard another script is necessary, which first disables the |
| USB and then executes the boot command. If the boot command fails, |
| the script can reenable the USB kbd. |
| |
| Common USB Commands: |
| - usb start: |
| - usb reset: (re)starts the USB. All USB devices will be |
| initialized and a device tree is build for them. |
| - usb tree: shows all USB devices in a tree like display |
| - usb info [dev]: shows all USB infos of the device dev, or of all |
| the devices |
| - usb stop [f]: stops the USB. If f==1 the USB will also stop if |
| an USB keyboard is assigned as stdin. The stdin |
| is then switched to serial input. |
| Storage USB Commands: |
| - usb scan: scans the USB for storage devices.The USB must be |
| running for this command (usb start) |
| - usb device [dev]: show or set current USB staorage device |
| - usb part [dev]: print partition table of one or all USB storage |
| devices |
| - usb read addr blk# cnt: |
| read `cnt' blocks starting at block `blk#'to |
| memory address `addr' |
| - usbboot addr dev:part: |
| boot from USB device |
| |
| Config Switches: |
| ---------------- |
| CFG_CMD_USB enables basic USB support and the usb command |
| CONFIG_USB_UHCI defines the lowlevel part.A lowlevel part must be defined if |
| using CFG_CMD_USB |
| CONFIG_USB_KEYBOARD enables the USB Keyboard |
| CONFIG_USB_STORAGE enables the USB storage devices |
