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This version is outdated by a newer approved version.DiffThis version (20 Nov 2018 16:51) was approved by Michael Hennerich.The Previously approved version (20 Nov 2018 16:47) is available.Diff

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Table of Contents

AXI JESD204B HDL Linux Driver

NOTE:
This driver is RETIRED, DEPRECATED and not used anymore in any of the recent projects!

Please see here instead: Linux

Supported Devices

This driver supports the

Description

The AXI JESD204 HDL driver is the driver for the HDL interface core which is used on various FPGA designs interfacing to the AD9250. The driver is implemented as an Open Firmware Device Tree (DT) platform driver. It's register map can be found here: Base register map (common to all cores)

Source Code

Status

Source Mainlined?
drivers/iio/jesd204/axi_jesd204b_v51.c WIP

Files

Function File
driver drivers/iio/jesd204/axi_jesd204b_v51.c
include drivers/iio/jesd204/axi_jesd204b_v51.h

Example platform device initialization

The AXI JESD204B driver is a platform driver and can currently only be instantiated via device tree.

Required devicetree properties:

  • compatible: Should always be “xlnx,axi-jesd204b-rx2-1.00.a” or “xlnx,axi-jesd204b-rx4-1.00.a”
  • reg: Base address and register area size. This parameter expects a register range.
  • clocks: Clock provider phandle
  • clock-name: Clock input name string
  • jesd,frames-per-multiframe: Number of frames per multi-frame
  • jesd,bytes-per-frame: Number of bytes (octets) per frame
  • jesd,lanesync_en: Enable lane synchronization
  • jesd,scramble_en: Enable scrambling

Example: 

		axi_jesd204b_rx2_0: axi-jesd204b-rx2@77a00000 {
			compatible = "xlnx,axi-jesd204b-rx2-1.00.a";
			reg = < 0x77a00000 0x10000 >;
			clocks = <&ad9250_clkin>;
			clock-names = "clkin";
			jesd,lanesync_en;
			jesd,scramble_en;
			jesd,frames-per-multiframe = <32>;
			jesd,bytes-per-frame = <2>;
			xlnx,cf-buftype = <0x0>;
			xlnx,dphase-timeout = <0x8>;
			xlnx,family = "kintex7";
			xlnx,num-mem = <0x1>;
			xlnx,num-reg = <0x1>;
			xlnx,s-axi-min-size = <0x1ff>;
			xlnx,slv-awidth = <0x20>;
			xlnx,slv-dwidth = <0x20>;
			xlnx,use-wstrb = <0x0>;
		} ;

Enabling Linux driver support

Configure kernel with “make menuconfig” (alternatively use “make xconfig” or “make qconfig”)

Adding Linux driver support

Configure kernel with “make menuconfig” (alternatively use “make xconfig” or “make qconfig”) 

Linux Kernel Configuration
	Device Drivers  --->
	<*>     Industrial I/O support --->
	    --- Industrial I/O support
	    -*-   Enable ring buffer support within IIO
	    -*-     Industrial I/O lock free software ring
	    -*-   Enable triggered sampling support

	          *** Analog to digital converters ***
	    [--snip--]

		<*>   Generic AXI JESD204B configuration driver

	    [--snip--]

Driver Testing

# cd /sys/bus/platform/devices/44a91000.jesd204/
# ls -al
total 0
drwxr-xr-x    2 root     root             0 Jan  1 00:21 .
drwxr-xr-x   25 root     root             0 Jan  1 00:00 ..
lrwxrwxrwx    1 root     root             0 Jan  1 00:21 driver -> ../../../bus/platform/drivers/cf_axi_jesd204b_v51
-rw-r--r--    1 root     root          4096 Jan  1 00:21 driver_override
-r--------    1 root     root          4096 Jan  1 00:21 lane0_info
-r--------    1 root     root          4096 Jan  1 00:21 lane0_syncstat
-r--------    1 root     root          4096 Jan  1 00:21 lane1_info
-r--------    1 root     root          4096 Jan  1 00:21 lane1_syncstat
-r--------    1 root     root          4096 Jan  1 00:21 lane2_info
-r--------    1 root     root          4096 Jan  1 00:21 lane2_syncstat
-r--------    1 root     root          4096 Jan  1 00:21 lane3_info
-r--------    1 root     root          4096 Jan  1 00:21 lane3_syncstat
-r--r--r--    1 root     root          4096 Jan  1 00:21 modalias
-rw-------    1 root     root          4096 Jan  1 00:21 reg_access
lrwxrwxrwx    1 root     root             0 Jan  1 00:21 subsystem -> ../../../bus/platform
-rw-r--r--    1 root     root          4096 Jan  1 00:21 uevent

# cat lane0_info 
DID: 0, BID: 1, LID: 1, L: 4, SCR: 1, F: 1
K: 32, M: 2, N: 14, CS: 0, S: 1, N': 16, HD: 1
FCHK: 0x81, CF: 0
ADJCNT: 0, PHYADJ: 0, ADJDIR: 0, JESDV: 1, SUBCLASS: 1
MFCNT : 0x0
ILACNT: 0x0
ERRCNT: 0x0
BUFCNT: 0x14
LECNT: 0x0
FC: 500000000
# 
# cat lane0_syncstat 
NOT_IN_TAB: 0, DISPARITY: 0, UNEXPECTED_K: 0
#
resources/tools-software/linux-drivers/iio-adc/axi-jesd204b-hdl.1542729091.txt.gz · Last modified: 20 Nov 2018 16:51 by Michael Hennerich

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