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