261 lines
9.5 KiB
Plaintext
Executable file
261 lines
9.5 KiB
Plaintext
Executable file
|
|
Driver for the Intel Wireless Wimax Connection 2400m
|
|
|
|
(C) 2008 Intel Corporation < linux-wimax@intel.com >
|
|
|
|
This provides a driver for the Intel Wireless WiMAX Connection 2400m
|
|
and a basic Linux kernel WiMAX stack.
|
|
|
|
1. Requirements
|
|
|
|
* Linux installation with Linux kernel 2.6.22 or newer (if building
|
|
from a separate tree)
|
|
* Intel i2400m Echo Peak or Baxter Peak; this includes the Intel
|
|
Wireless WiMAX/WiFi Link 5x50 series.
|
|
* build tools:
|
|
+ Linux kernel development package for the target kernel; to
|
|
build against your currently running kernel, you need to have
|
|
the kernel development package corresponding to the running
|
|
image installed (usually if your kernel is named
|
|
linux-VERSION, the development package is called
|
|
linux-dev-VERSION or linux-headers-VERSION).
|
|
+ GNU C Compiler, make
|
|
|
|
2. Compilation and installation
|
|
|
|
2.1. Compilation of the drivers included in the kernel
|
|
|
|
Configure the kernel; to enable the WiMAX drivers select Drivers >
|
|
Networking Drivers > WiMAX device support. Enable all of them as
|
|
modules (easier).
|
|
|
|
If USB or SDIO are not enabled in the kernel configuration, the options
|
|
to build the i2400m USB or SDIO drivers will not show. Enable said
|
|
subsystems and go back to the WiMAX menu to enable the drivers.
|
|
|
|
Compile and install your kernel as usual.
|
|
|
|
2.2. Compilation of the drivers distributed as an standalone module
|
|
|
|
To compile
|
|
|
|
$ cd source/directory
|
|
$ make
|
|
|
|
Once built you can load and unload using the provided load.sh script;
|
|
load.sh will load the modules, load.sh u will unload them.
|
|
|
|
To install in the default kernel directories (and enable auto loading
|
|
when the device is plugged):
|
|
|
|
$ make install
|
|
$ depmod -a
|
|
|
|
If your kernel development files are located in a non standard
|
|
directory or if you want to build for a kernel that is not the
|
|
currently running one, set KDIR to the right location:
|
|
|
|
$ make KDIR=/path/to/kernel/dev/tree
|
|
|
|
For more information, please contact linux-wimax@intel.com.
|
|
|
|
3. Installing the firmware
|
|
|
|
The firmware can be obtained from http://linuxwimax.org or might have
|
|
been supplied with your hardware.
|
|
|
|
It has to be installed in the target system:
|
|
*
|
|
$ cp FIRMWAREFILE.sbcf /lib/firmware/i2400m-fw-BUSTYPE-1.3.sbcf
|
|
|
|
* NOTE: if your firmware came in an .rpm or .deb file, just install
|
|
it as normal, with the rpm (rpm -i FIRMWARE.rpm) or dpkg
|
|
(dpkg -i FIRMWARE.deb) commands. No further action is needed.
|
|
* BUSTYPE will be usb or sdio, depending on the hardware you have.
|
|
Each hardware type comes with its own firmware and will not work
|
|
with other types.
|
|
|
|
4. Design
|
|
|
|
This package contains two major parts: a WiMAX kernel stack and a
|
|
driver for the Intel i2400m.
|
|
|
|
The WiMAX stack is designed to provide for common WiMAX control
|
|
services to current and future WiMAX devices from any vendor; please
|
|
see README.wimax for details.
|
|
|
|
The i2400m kernel driver is broken up in two main parts: the bus
|
|
generic driver and the bus-specific drivers. The bus generic driver
|
|
forms the drivercore and contain no knowledge of the actual method we
|
|
use to connect to the device. The bus specific drivers are just the
|
|
glue to connect the bus-generic driver and the device. Currently only
|
|
USB and SDIO are supported. See drivers/net/wimax/i2400m/i2400m.h for
|
|
more information.
|
|
|
|
The bus generic driver is logically broken up in two parts: OS-glue and
|
|
hardware-glue. The OS-glue interfaces with Linux. The hardware-glue
|
|
interfaces with the device on using an interface provided by the
|
|
bus-specific driver. The reason for this breakup is to be able to
|
|
easily reuse the hardware-glue to write drivers for other OSes; note
|
|
the hardware glue part is written as a native Linux driver; no
|
|
abstraction layers are used, so to port to another OS, the Linux kernel
|
|
API calls should be replaced with the target OS's.
|
|
|
|
5. Usage
|
|
|
|
To load the driver, follow the instructions in the install section;
|
|
once the driver is loaded, plug in the device (unless it is permanently
|
|
plugged in). The driver will enumerate the device, upload the firmware
|
|
and output messages in the kernel log (dmesg, /var/log/messages or
|
|
/var/log/kern.log) such as:
|
|
|
|
...
|
|
i2400m_usb 5-4:1.0: firmware interface version 8.0.0
|
|
i2400m_usb 5-4:1.0: WiMAX interface wmx0 (00:1d:e1:01:94:2c) ready
|
|
|
|
At this point the device is ready to work.
|
|
|
|
Current versions require the Intel WiMAX Network Service in userspace
|
|
to make things work. See the network service's README for instructions
|
|
on how to scan, connect and disconnect.
|
|
|
|
5.1. Module parameters
|
|
|
|
Module parameters can be set at kernel or module load time or by
|
|
echoing values:
|
|
|
|
$ echo VALUE > /sys/module/MODULENAME/parameters/PARAMETERNAME
|
|
|
|
To make changes permanent, for example, for the i2400m module, you can
|
|
also create a file named /etc/modprobe.d/i2400m containing:
|
|
|
|
options i2400m idle_mode_disabled=1
|
|
|
|
To find which parameters are supported by a module, run:
|
|
|
|
$ modinfo path/to/module.ko
|
|
|
|
During kernel bootup (if the driver is linked in the kernel), specify
|
|
the following to the kernel command line:
|
|
|
|
i2400m.PARAMETER=VALUE
|
|
|
|
5.1.1. i2400m: idle_mode_disabled
|
|
|
|
The i2400m module supports a parameter to disable idle mode. This
|
|
parameter, once set, will take effect only when the device is
|
|
reinitialized by the driver (eg: following a reset or a reconnect).
|
|
|
|
5.2. Debug operations: debugfs entries
|
|
|
|
The driver will register debugfs entries that allow the user to tweak
|
|
debug settings. There are three main container directories where
|
|
entries are placed, which correspond to the three blocks a i2400m WiMAX
|
|
driver has:
|
|
* /sys/kernel/debug/wimax:DEVNAME/ for the generic WiMAX stack
|
|
controls
|
|
* /sys/kernel/debug/wimax:DEVNAME/i2400m for the i2400m generic
|
|
driver controls
|
|
* /sys/kernel/debug/wimax:DEVNAME/i2400m-usb (or -sdio) for the
|
|
bus-specific i2400m-usb or i2400m-sdio controls).
|
|
|
|
Of course, if debugfs is mounted in a directory other than
|
|
/sys/kernel/debug, those paths will change.
|
|
|
|
5.2.1. Increasing debug output
|
|
|
|
The files named *dl_* indicate knobs for controlling the debug output
|
|
of different submodules:
|
|
*
|
|
# find /sys/kernel/debug/wimax\:wmx0 -name \*dl_\*
|
|
/sys/kernel/debug/wimax:wmx0/i2400m-usb/dl_tx
|
|
/sys/kernel/debug/wimax:wmx0/i2400m-usb/dl_rx
|
|
/sys/kernel/debug/wimax:wmx0/i2400m-usb/dl_notif
|
|
/sys/kernel/debug/wimax:wmx0/i2400m-usb/dl_fw
|
|
/sys/kernel/debug/wimax:wmx0/i2400m-usb/dl_usb
|
|
/sys/kernel/debug/wimax:wmx0/i2400m/dl_tx
|
|
/sys/kernel/debug/wimax:wmx0/i2400m/dl_rx
|
|
/sys/kernel/debug/wimax:wmx0/i2400m/dl_rfkill
|
|
/sys/kernel/debug/wimax:wmx0/i2400m/dl_netdev
|
|
/sys/kernel/debug/wimax:wmx0/i2400m/dl_fw
|
|
/sys/kernel/debug/wimax:wmx0/i2400m/dl_debugfs
|
|
/sys/kernel/debug/wimax:wmx0/i2400m/dl_driver
|
|
/sys/kernel/debug/wimax:wmx0/i2400m/dl_control
|
|
/sys/kernel/debug/wimax:wmx0/wimax_dl_stack
|
|
/sys/kernel/debug/wimax:wmx0/wimax_dl_op_rfkill
|
|
/sys/kernel/debug/wimax:wmx0/wimax_dl_op_reset
|
|
/sys/kernel/debug/wimax:wmx0/wimax_dl_op_msg
|
|
/sys/kernel/debug/wimax:wmx0/wimax_dl_id_table
|
|
/sys/kernel/debug/wimax:wmx0/wimax_dl_debugfs
|
|
|
|
By reading the file you can obtain the current value of said debug
|
|
level; by writing to it, you can set it.
|
|
|
|
To increase the debug level of, for example, the i2400m's generic TX
|
|
engine, just write:
|
|
|
|
$ echo 3 > /sys/kernel/debug/wimax:wmx0/i2400m/dl_tx
|
|
|
|
Increasing numbers yield increasing debug information; for details of
|
|
what is printed and the available levels, check the source. The code
|
|
uses 0 for disabled and increasing values until 8.
|
|
|
|
5.2.2. RX and TX statistics
|
|
|
|
The i2400m/rx_stats and i2400m/tx_stats provide statistics about the
|
|
data reception/delivery from the device:
|
|
|
|
$ cat /sys/kernel/debug/wimax:wmx0/i2400m/rx_stats
|
|
45 1 3 34 3104 48 480
|
|
|
|
The numbers reported are
|
|
* packets/RX-buffer: total, min, max
|
|
* RX-buffers: total RX buffers received, accumulated RX buffer size
|
|
in bytes, min size received, max size received
|
|
|
|
Thus, to find the average buffer size received, divide accumulated
|
|
RX-buffer / total RX-buffers.
|
|
|
|
To clear the statistics back to 0, write anything to the rx_stats file:
|
|
|
|
$ echo 1 > /sys/kernel/debug/wimax:wmx0/i2400m_rx_stats
|
|
|
|
Likewise for TX.
|
|
|
|
Note the packets this debug file refers to are not network packet, but
|
|
packets in the sense of the device-specific protocol for communication
|
|
to the host. See drivers/net/wimax/i2400m/tx.c.
|
|
|
|
5.2.3. Tracing messages received from user space
|
|
|
|
To echo messages received from user space into the trace pipe that the
|
|
i2400m driver creates, set the debug file i2400m/trace_msg_from_user to
|
|
1:
|
|
*
|
|
$ echo 1 > /sys/kernel/debug/wimax:wmx0/i2400m/trace_msg_from_user
|
|
|
|
5.2.4. Performing a device reset
|
|
|
|
By writing a 0, a 1 or a 2 to the file
|
|
/sys/kernel/debug/wimax:wmx0/reset, the driver performs a warm (without
|
|
disconnecting from the bus), cold (disconnecting from the bus) or bus
|
|
(bus specific) reset on the device.
|
|
|
|
5.2.5. Asking the device to enter power saving mode
|
|
|
|
By writing any value to the /sys/kernel/debug/wimax:wmx0 file, the
|
|
device will attempt to enter power saving mode.
|
|
|
|
6. Troubleshooting
|
|
|
|
6.1. Driver complains about 'i2400m-fw-usb-1.2.sbcf: request failed'
|
|
|
|
If upon connecting the device, the following is output in the kernel
|
|
log:
|
|
|
|
i2400m_usb 5-4:1.0: fw i2400m-fw-usb-1.3.sbcf: request failed: -2
|
|
|
|
This means that the driver cannot locate the firmware file named
|
|
/lib/firmware/i2400m-fw-usb-1.2.sbcf. Check that the file is present in
|
|
the right location.
|