NXP Semiconductors Layerscape LS1028A BSP - Page 59

Option Values Default Value Description
CONFIG_FSL_QDMA y/m/n n qDMA driver
Device Tree Binding
Device Tree Node
Below is an example device tree node required by this feature. Note that it may has differences among platforms.
qdma: qdma@8380000 {
compatible = "fsl,ls1046a-qdma", "fsl,ls1021a-qdma";
reg = <0x0 0x8380000 0x0 0x1000>, /* Controller regs */
<0x0 0x8390000 0x0 0x10000>, /* Status regs */
<0x0 0x83a0000 0x0 0x40000>; /* Block regs */
interrupts = <0 153 0x4>,
<0 39 0x4>;
interrupt-names = "qdma-error", "qdma-queue";
channels = <8>;
queues = <2>;
status-sizes = <64>;
queue-sizes = <64 64>;
big-endian;
};
Source File
The following source files are related the feature in Linux kernel.
Source File Description
drivers/dma/fsl-qdma.c The qDMA driver file
Verification in Linux
root@ls1043ardb:~# echo 1024 > /sys/module/dmatest/parameters/test_buf_size;
root@ls1043ardb:~# echo 4 > /sys/module/dmatest/parameters/threads_per_chan;
root@ls1043ardb:~# echo 2 > /sys/module/dmatest/parameters/max_channels;
root@ls1043ardb:~# echo 100 > /sys/module/dmatest/parameters/iterations;
root@ls1043ardb:~# echo 1 > /sys/module/dmatest/parameters/run
[ 32.498138] dmatest: Started 4 threads using dma0chan0
[ 32.503430] dmatest: Started 4 threads using dma0chan1
[ 32.508939] dmatest: Started 4 threads using dma0chan2
[ 32.520073] dmatest: dma0chan0-copy0: summary 100 tests, 0 failures 4904 iops 2452 KB/s (0)
[ 32.520076] dmatest: dma0chan0-copy2: summary 100 tests, 0 failures 4923 iops 2461 KB/s (0)
[ 32.520079] dmatest: dma0chan0-copy3: summary 100 tests, 0 failures 4928 iops 2661 KB/s (0)
[ 32.520176] dmatest: dma0chan0-copy1: summary 100 tests, 0 failures 4892 iops 2446 KB/s (0)
[ 32.526438] dmatest: dma0chan1-copy0: summary 100 tests, 0 failures 4666 iops 2240 KB/s (0)
[ 32.526441] dmatest: dma0chan1-copy2: summary 100 tests, 0 failures 4675 iops 2291 KB/s (0)
[ 32.526469] dmatest: dma0chan1-copy3: summary 100 tests, 0 failures 4674 iops 2197 KB/s (0)
[ 32.529610] dmatest: dma0chan2-copy1: summary 100 tests, 0 failures 5168 iops 2791 KB/s (0)
[ 32.529613] dmatest: dma0chan2-copy0: summary 100 tests, 0 failures 5164 iops 2478 KB/s (0)
[ 32.529754] dmatest: dma0chan2-copy3: summary 100 tests, 0 failures 5215 iops 2555 KB/s (0)
[ 32.529756] dmatest: dma0chan2-copy2: summary 100 tests, 0 failures 5211 iops 2709 KB/s (0)
[ 32.537881] dmatest: dma0chan1-copy1: summary 100 tests, 0 failures 3044 iops 1461 KB/s (0) (0)
dmatest: dma0chan0-copy3: summary 1000 tests, 0 failures 4078 iops 33474 KB/s (0)
Device Drivers
Layerscape LS1028A BSP User Guide, Rev. 0.3, 04/2019
NXP Semiconductors
59