Issue
The uio_dmem_genirq driver is backwards compatible with the uio_pdrv_genirq driver but with the addition that it dynamically allocates continuous memory. How do the device tree entries have to be defined to load the dmem driver? The working configuration for the pdrv version consists of the following device tree entry:
spw0@7aa00000 {
compatible = "generic-uio";
reg = <0x7aa00000 0x10000>;
interrupts = <0x0 0x1D 0x4>;
interrupt-parent = <0x3>;
clocks = <0x1>;
};
and changing the bootargs to console=ttyPS0,115200 root=/dev/mmcblk0p1 rw rootwait earlyprintk uio_pdrv_genirq.of_id=generic-uio.
My current configuration for the dmem version looks as follows, but does not load the uio driver despite it being compiled into the kernel. This is the output of /lib/modules/4.4.0-xilinx/modules.builtin
kernel/drivers/uio/uio.ko
kernel/drivers/uio/uio_pdrv_genirq.ko
kernel/drivers/uio/uio_dmem_genirq.ko
The two different styles used to try and configure the drivers are:
spw0@7aa00000 {
compatible = "generic-uio";
reg = <0x7aa00000 0x10000>;
uio,number-of-dynamic-regions = <1>;
uio,dynamic-regions-sizes = <0x4000>;
interrupts = <0x0 0x1D 0x4>;
interrupt-parent = <0x3>;
clocks = <0x1>;
};
spw1@7aa00000 {
compatible = "generic-uio";
num_dynamic_regions = <2>;
dynamic_region_sizes = <0x8000>;
interrupts = <0x0 0x1E 0x4>;
interrupt-parent = <0x3>;
clocks = <0x1>;
};
And the bootargs are updated to console=ttyPS0,115200 root=/dev/mmcblk0p1 rw rootwait earlyprintk uio_dmem_genirq.of_id=generic-uio.
Solution
This is a device tree files that works for me. It may have a weird configuration here or there and would appreciate feedback if you have had to change something.
/dts-v1/;
/ {
#address-cells = <0x1>;
#size-cells = <0x1>;
compatible = "xlnx,zynq-7000";
model = "uart0";
chosen {
bootargs = "console=ttyPS0,115200 earlyprintk";
};
aliases {
serial0 = "/amba/serial@e0000000";
ethernet0 = "/amba/ethernet@e000b000";
spi0 = "/amba/spi@e000d000";
};
memory {
device_type = "memory";
reg = <0x0 0x40000000>;
};
reserved-memory {
#address-cells = <1>;
#size-cells = <1>;
ranges;
spw_dma@3E000000 {
reg = <0x3E000000 0x2000000>;
};
};
cpus {
#address-cells = <0x1>;
#size-cells = <0x0>;
cpu@0 {
compatible = "arm,cortex-a9";
device_type = "cpu";
reg = <0x0>;
clocks = <0x1 0x3>;
clock-latency = <0x3e8>;
cpu0-supply = <0x2>;
operating-points = <0xa2c2a 0xf4240 0x51615 0xf4240>;
};
cpu@1 {
compatible = "arm,cortex-a9";
device_type = "cpu";
reg = <0x1>;
clocks = <0x1 0x3>;
};
};
pmu {
compatible = "arm,cortex-a9-pmu";
interrupts = <0x0 0x5 0x4 0x0 0x6 0x4>;
interrupt-parent = <0x3>;
reg = <0xf8891000 0x1000 0xf8893000 0x1000>;
};
fixedregulator@0 {
compatible = "regulator-fixed";
regulator-name = "VCCPINT";
regulator-min-microvolt = <0xf4240>;
regulator-max-microvolt = <0xf4240>;
regulator-boot-on;
regulator-always-on;
linux,phandle = <0x2>;
phandle = <0x2>;
};
amba {
compatible = "simple-bus";
#address-cells = <0x1>;
#size-cells = <0x1>;
interrupt-parent = <0x3>;
ranges;
spw0@7aa00000 {
compatible = "generic-uio";
reg = <0x7aa00000 0x10000>;
uio,number-of-dynamic-regions = <1>;
uio,dynamic-regions-sizes = <0x4000>;
interrupts = <0x0 0x1D 0x0>;
interrupt-parent = <0x3>;
clocks = <0x1>;
};
spw1@7aa00000 {
compatible = "generic-uio";
uio,number-of-dynamic-regions = <2>;
uio,dynamic-regions-sizes = <0x8000>;
interrupts = <0x0 0x1E 0x0>;
interrupt-parent = <0x3>;
clocks = <0x1>;
};
spw2@7aa00000 {
compatible = "generic-uio";
reg = <0x3d000000 0x10000>;
interrupts = <0x0 0x1F 0x0>;
interrupt-parent = <0x3>;
clocks = <0x1>;
};
spw3@7aa00000 {
compatible = "generic-uio";
interrupts = <0x0 0x20 0x0>;
interrupt-parent = <0x3>;
clocks = <0x1>;
};
spw4@7aa00000 {
compatible = "generic-uio";
interrupts = <0x0 0x21 0x4>;
interrupt-parent = <0x3>;
clocks = <0x1>;
};
spw5@7aa00000 {
compatible = "generic-uio";
interrupts = <0x0 0x22 0x4>;
interrupt-parent = <0x3>;
clocks = <0x1>;
};
spw6@7aa00000 {
compatible = "generic-uio";
interrupts = <0x0 0x23 0x4>;
interrupt-parent = <0x3>;
clocks = <0x1>;
};
spw7@7aa00000 {
compatible = "generic-uio";
interrupts = <0x0 0x24 0x4>;
interrupt-parent = <0x3>;
clocks = <0x1>;
};
spw8@7aa00000 {
compatible = "generic-uio";
interrupts = <0x0 0x34 0x4>;
interrupt-parent = <0x3>;
clocks = <0x1>;
};
spw9@7aa00000 {
compatible = "generic-uio";
interrupts = <0x0 0x35 0x4>;
interrupt-parent = <0x3>;
clocks = <0x1>;
};
spw10@7aa00000 {
compatible = "generic-uio";
interrupts = <0x0 0x36 0x4>;
interrupt-parent = <0x3>;
clocks = <0x1>;
};
spw11@7aa00000 {
compatible = "generic-uio";
interrupts = <0x0 0x37 0x4>;
interrupt-parent = <0x3>;
clocks = <0x1>;
};
spw12@7aa00000 {
compatible = "generic-uio";
interrupts = <0x0 0x38 0x4>;
interrupt-parent = <0x3>;
clocks = <0x1>;
};
spw13@7aa00000 {
compatible = "generic-uio";
interrupts = <0x0 0x39 0x4>;
interrupt-parent = <0x3>;
clocks = <0x1>;
};
spw14@7aa00000 {
compatible = "generic-uio";
interrupts = <0x0 0x3A 0x4>;
interrupt-parent = <0x3>;
clocks = <0x1>;
};
spw15@7aa00000 {
compatible = "generic-uio";
interrupts = <0x0 0x3B 0x4>;
interrupt-parent = <0x3>;
clocks = <0x1>;
};
adc@f8007100 {
compatible = "xlnx,zynq-xadc-1.00.a";
reg = <0xf8007100 0x20>;
interrupts = <0x0 0x7 0x4>;
interrupt-parent = <0x3>;
clocks = <0x1 0xc>;
};
can@e0008000 {
compatible = "xlnx,zynq-can-1.0";
status = "disabled";
clocks = <0x1 0x13 0x1 0x24>;
clock-names = "can_clk", "pclk";
reg = <0xe0008000 0x1000>;
interrupts = <0x0 0x1c 0x4>;
interrupt-parent = <0x3>;
tx-fifo-depth = <0x40>;
rx-fifo-depth = <0x40>;
};
can@e0009000 {
compatible = "xlnx,zynq-can-1.0";
status = "disabled";
clocks = <0x1 0x14 0x1 0x25>;
clock-names = "can_clk", "pclk";
reg = <0xe0009000 0x1000>;
interrupts = <0x0 0x33 0x4>;
interrupt-parent = <0x3>;
tx-fifo-depth = <0x40>;
rx-fifo-depth = <0x40>;
};
gpio@e000a000 {
compatible = "xlnx,zynq-gpio-1.0";
#gpio-cells = <0x2>;
clocks = <0x1 0x2a>;
gpio-controller;
interrupt-parent = <0x3>;
interrupts = <0x0 0x14 0x4>;
reg = <0xe000a000 0x1000>;
emio-gpio-width = <0x40>;
gpio-mask-high = <0x0>;
gpio-mask-low = <0x5600>;
};
i2c@e0004000 {
compatible = "cdns,i2c-r1p10";
status = "okay";
clocks = <0x1 0x26>;
interrupt-parent = <0x3>;
interrupts = <0x0 0x19 0x4>;
reg = <0xe0004000 0x1000>;
#address-cells = <0x1>;
#size-cells = <0x0>;
clock-frequency = <0x61a80>;
};
i2c@e0005000 {
compatible = "cdns,i2c-r1p10";
status = "okay";
clocks = <0x1 0x27>;
interrupt-parent = <0x3>;
interrupts = <0x0 0x30 0x4>;
reg = <0xe0005000 0x1000>;
#address-cells = <0x1>;
#size-cells = <0x0>;
clock-frequency = <0x61a80>;
};
interrupt-controller@f8f01000 {
compatible = "arm,cortex-a9-gic";
#interrupt-cells = <0x3>;
interrupt-controller;
reg = <0xf8f01000 0x1000 0xf8f00100 0x100>;
num_cpus = <0x2>;
num_interrupts = <0x60>;
linux,phandle = <0x3>;
phandle = <0x3>;
};
cache-controller@f8f02000 {
compatible = "arm,pl310-cache";
reg = <0xf8f02000 0x1000>;
interrupts = <0x0 0x2 0x4>;
arm,data-latency = <0x3 0x2 0x2>;
arm,tag-latency = <0x2 0x2 0x2>;
cache-unified;
cache-level = <0x2>;
};
memory-controller@f8006000 {
compatible = "xlnx,zynq-ddrc-a05";
reg = <0xf8006000 0x1000>;
};
ocmc@f800c000 {
compatible = "xlnx,zynq-ocmc-1.0";
interrupt-parent = <0x3>;
interrupts = <0x0 0x3 0x4>;
reg = <0xf800c000 0x1000>;
};
serial@e0000000 {
compatible = "xlnx,xuartps", "cdns,uart-r1p8";
status = "okay";
clocks = <0x1 0x17 0x1 0x28>;
clock-names = "uart_clk", "pclk";
reg = <0xe0000000 0x1000>;
interrupts = <0x0 0x1b 0x4>;
current-speed = <0x1c200>;
device_type = "serial";
port-number = <0x0>;
};
serial@e0001000 {
compatible = "xlnx,xuartps", "cdns,uart-r1p8";
status = "disabled";
clocks = <0x1 0x18 0x1 0x29>;
clock-names = "uart_clk", "pclk";
reg = <0xe0001000 0x1000>;
interrupts = <0x0 0x32 0x4>;
};
spi@e0006000 {
compatible = "xlnx,zynq-spi-r1p6";
reg = <0xe0006000 0x1000>;
status = "okay";
interrupt-parent = <0x3>;
interrupts = <0x0 0x1a 0x4>;
clocks = <0x1 0x19 0x1 0x22>;
clock-names = "ref_clk", "pclk";
#address-cells = <0x1>;
#size-cells = <0x0>;
is-decoded-cs = <0x0>;
num-cs = <0x3>;
};
spi@e0007000 {
compatible = "xlnx,zynq-spi-r1p6";
reg = <0xe0007000 0x1000>;
status = "okay";
interrupt-parent = <0x3>;
interrupts = <0x0 0x31 0x4>;
clocks = <0x1 0x1a 0x1 0x23>;
clock-names = "ref_clk", "pclk";
#address-cells = <0x1>;
#size-cells = <0x0>;
is-decoded-cs = <0x0>;
num-cs = <0x3>;
};
spi@e000d000 {
clock-names = "ref_clk", "pclk";
clocks = <0x1 0xa 0x1 0x2b>;
compatible = "xlnx,zynq-qspi-1.0";
status = "okay";
interrupt-parent = <0x3>;
interrupts = <0x0 0x13 0x4>;
reg = <0xe000d000 0x1000>;
#address-cells = <0x1>;
#size-cells = <0x0>;
is-dual = <0x0>;
num-cs = <0x1>;
flash@0 {
compatible = "micron,n25q128";
reg = <0x0>;
#address-cells = <0x1>;
#size-cells = <0x1>;
spi-max-frequency = <0x2faf080>;
partition@0x00000000 {
label = "boot";
reg = <0x0 0x500000>;
};
partition@0x00500000 {
label = "bootenv";
reg = <0x500000 0x20000>;
};
partition@0x00520000 {
label = "kernel";
reg = <0x520000 0xa80000>;
};
partition@0x00fa0000 {
label = "spare";
reg = <0xfa0000 0x0>;
};
};
};
memory-controller@e000e000 {
#address-cells = <0x1>;
#size-cells = <0x1>;
status = "disabled";
clock-names = "memclk", "aclk";
clocks = <0x1 0xb 0x1 0x2c>;
compatible = "arm,pl353-smc-r2p1";
interrupt-parent = <0x3>;
interrupts = <0x0 0x12 0x4>;
ranges;
reg = <0xe000e000 0x1000>;
flash@e1000000 {
status = "disabled";
compatible = "arm,pl353-nand-r2p1";
reg = <0xe1000000 0x1000000>;
#address-cells = <0x1>;
#size-cells = <0x1>;
};
flash@e2000000 {
status = "disabled";
compatible = "cfi-flash";
reg = <0xe2000000 0x2000000>;
#address-cells = <0x1>;
#size-cells = <0x1>;
};
};
ethernet@e000b000 {
compatible = "cdns,gem";
reg = <0xe000b000 0x1000>;
status = "okay";
interrupts = <0x0 0x16 0x4>;
clocks = <0x1 0x1e 0x1 0x1e 0x1 0xd>;
clock-names = "pclk", "hclk", "tx_clk";
#address-cells = <0x1>;
#size-cells = <0x0>;
phy-mode = "rgmii-id";
xlnx,ptp-enet-clock = <0x69f6bcb>;
local-mac-address = [00 0a 35 00 1e 53];
};
ethernet@e000c000 {
compatible = "cdns,gem";
reg = <0xe000c000 0x1000>;
status = "disabled";
interrupts = <0x0 0x2d 0x4>;
clocks = <0x1 0x1f 0x1 0x1f 0x1 0xe>;
clock-names = "pclk", "hclk", "tx_clk";
#address-cells = <0x1>;
#size-cells = <0x0>;
};
sdhci@e0100000 {
compatible = "arasan,sdhci-8.9a";
status = "okay";
clock-names = "clk_xin", "clk_ahb";
clocks = <0x1 0x15 0x1 0x20>;
interrupt-parent = <0x3>;
interrupts = <0x0 0x18 0x4>;
reg = <0xe0100000 0x1000>;
xlnx,has-cd = <0x1>;
xlnx,has-power = <0x0>;
xlnx,has-wp = <0x1>;
};
sdhci@e0101000 {
compatible = "arasan,sdhci-8.9a";
status = "okay";
clock-names = "clk_xin", "clk_ahb";
clocks = <0x1 0x16 0x1 0x21>;
interrupt-parent = <0x3>;
interrupts = <0x0 0x2f 0x4>;
reg = <0xe0101000 0x1000>;
xlnx,has-cd = <0x1>;
xlnx,has-power = <0x0>;
xlnx,has-wp = <0x1>;
};
slcr@f8000000 {
#address-cells = <0x1>;
#size-cells = <0x1>;
compatible = "xlnx,zynq-slcr", "syscon", "simple-bus";
reg = <0xf8000000 0x1000>;
ranges;
linux,phandle = <0x4>;
phandle = <0x4>;
clkc@100 {
#clock-cells = <0x1>;
compatible = "xlnx,ps7-clkc";
fclk-enable = <0x3>;
clock-output-names = "armpll", "ddrpll", "iopll", "cpu_6or4x", "cpu_3or2x", "cpu_2x", "cpu_1x", "ddr2x", "ddr3x", "dci", "lqspi", "smc", "pcap", "gem0", "gem1", "fclk0", "fclk1", "fclk2", "fclk3", "can0", "can1", "sdio0", "sdio1", "uart0", "uart1", "spi0", "spi1", "dma", "usb0_aper", "usb1_aper", "gem0_aper", "gem1_aper", "sdio0_aper", "sdio1_aper", "spi0_aper", "spi1_aper", "can0_aper", "can1_aper", "i2c0_aper", "i2c1_aper", "uart0_aper", "uart1_aper", "gpio_aper", "lqspi_aper", "smc_aper", "swdt", "dbg_trc", "dbg_apb";
reg = <0x100 0x100>;
ps-clk-frequency = <0x1fca055>;
linux,phandle = <0x1>;
phandle = <0x1>;
};
pinctrl@700 {
compatible = "xlnx,pinctrl-zynq";
reg = <0x700 0x200>;
syscon = <0x4>;
};
};
dmac@f8003000 {
compatible = "arm,pl330", "arm,primecell";
reg = <0xf8003000 0x1000>;
interrupt-parent = <0x3>;
interrupt-names = "abort", "dma0", "dma1", "dma2", "dma3", "dma4", "dma5", "dma6", "dma7";
interrupts = <0x0 0xd 0x4 0x0 0xe 0x4 0x0 0xf 0x4 0x0 0x10 0x4 0x0 0x11 0x4 0x0 0x28 0x4 0x0 0x29 0x4 0x0 0x2a 0x4 0x0 0x2b 0x4>;
#dma-cells = <0x1>;
#dma-channels = <0x8>;
#dma-requests = <0x4>;
clocks = <0x1 0x1b>;
clock-names = "apb_pclk";
};
devcfg@f8007000 {
clock-names = "ref_clk", "fclk0", "fclk1", "fclk2", "fclk3";
clocks = <0x1 0xc 0x1 0xf 0x1 0x10 0x1 0x11 0x1 0x12>;
compatible = "xlnx,zynq-devcfg-1.0";
interrupt-parent = <0x3>;
interrupts = <0x0 0x8 0x4>;
reg = <0xf8007000 0x100>;
syscon = <0x4>;
};
timer@f8f00200 {
compatible = "arm,cortex-a9-global-timer";
reg = <0xf8f00200 0x20>;
interrupts = <0x1 0xb 0x301>;
interrupt-parent = <0x3>;
clocks = <0x1 0x4>;
};
timer@f8001000 {
interrupt-parent = <0x3>;
interrupts = <0x0 0xa 0x4 0x0 0xb 0x4 0x0 0xc 0x4>;
compatible = "cdns,ttc";
clocks = <0x1 0x6>;
reg = <0xf8001000 0x1000>;
};
timer@f8002000 {
interrupt-parent = <0x3>;
interrupts = <0x0 0x25 0x4 0x0 0x26 0x4 0x0 0x27 0x4>;
compatible = "cdns,ttc";
clocks = <0x1 0x6>;
reg = <0xf8002000 0x1000>;
};
timer@f8f00600 {
interrupt-parent = <0x3>;
interrupts = <0x1 0xd 0x301>;
compatible = "arm,cortex-a9-twd-timer";
reg = <0xf8f00600 0x20>;
clocks = <0x1 0x4>;
};
usb@e0002000 {
compatible = "xlnx,zynq-usb-2.20a", "chipidea,usb2";
status = "okay";
clocks = <0x1 0x1c>;
interrupt-parent = <0x3>;
interrupts = <0x0 0x15 0x4>;
reg = <0xe0002000 0x1000>;
phy_type = "ulpi";
dr_mode = "host";
};
usb@e0003000 {
compatible = "xlnx,zynq-usb-2.20a", "chipidea,usb2";
status = "disabled";
clocks = <0x1 0x1d>;
interrupt-parent = <0x3>;
interrupts = <0x0 0x2c 0x4>;
reg = <0xe0003000 0x1000>;
phy_type = "ulpi";
};
watchdog@f8005000 {
clocks = <0x1 0x2d>;
compatible = "cdns,wdt-r1p2";
interrupt-parent = <0x3>;
interrupts = <0x0 0x9 0x1>;
reg = <0xf8005000 0x1000>;
reset-on-timeout;
timeout-sec = <0x2>;
};
};
};
In addition, the following file has to be added to compile the uio driver into the kernel enable-uio.cfg
CONFIG_UIO=y
CONFIG_UIO_PDRV_GENIRQ=y
CONFIG_UIO_DMEM_GENIRQ=y
The kernel bootargs have to include the last part
bootargs=console=ttyPS0,115200 root=/dev/mmcblk0p1 rw rootwait earlyprintk uio_pdrv_genirq.of_id=generic-uio
Note: my configuration references uio_dmem_genirq but it did not seem to work. My workaround was to use the reserved-memory entry but I did not explicitly verify it
Answered By - Moritz Answer Checked By - Candace Johnson (WPSolving Volunteer)