| /* | |
| * (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 |