zynq7010 在 linux 系统下 irq_f2p 中断驱动
Posted xhoufei2010
tags:
篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了zynq7010 在 linux 系统下 irq_f2p 中断驱动相关的知识，希望对你有一定的参考价值。
1 说明
zynq 平台，需要用到 pl （FPGA）端发送中断给 ps端（ARM），发送的中断名称为 IRQ_F2P[15:0]，该中断一共有16个，中断号分别为 61-68, 84-91。本文针对该中断在linux 环境开，开发驱动，驱动方式采用 uio 模型。
2 开发环境
1、软件环境：ubuntu14.04
vivado：2015.04
2、linux 内核版本：zynq7010黑金开发板配套内核包，linux 版本4.0.0
3、硬件环境：黑金开发板 zynq7010.
3 操作
3.1 PL 部分
该部资料没有重新整理，PL部分直接转载博主“ h244259402” 的文章，原文路径：
https://blog.csdn.net/h244259402/article/details/83993524
3.2 PS 部分
3.2.1 中断号说明
对于zynq 驱动，需要注意：
1、对于SPI中断，则对应到Linux 的中断标号，为芯片datasheet的中断号 -16.
例如中断号为 30，则对应的linux 中断号为 30 -16 = 14.
2、对于非 SPI 中断，则对应的 linux 中断标号，为芯片 datasheet 的中断号 -32.
例如 IRQ_F2P中断，中断号为 61，则对应的 linux 中断号为 61 - 32 = 29.
3.2.2 修改设备树
本文中，使用的中断为 irq_f2p 的中断号 61，那么对应的 linux 中断号为 29 = 0x19。
修改zynq 7010 的设备树文件 AX7010，在dts中，增加uio 中断。
uio@0
compatible="generic-uio";
status="okay";
interrupt-controller;
interrupt-parent=<0x4>;
interrupts=<0x0 0x1d 0x1>;
;
有些设备树版本不同，需要增加 reg参数，所以uio 的描述多增加一行 reg = <0 0>：
uio@0
reg = <0 0>
compatible="generic-uio";
status="okay";
interrupt-controller;
interrupt-parent=<0x4>;
interrupts=<0x0 0x1d 0x1>;
;
另外，增加命令行参数，加上 uio的参数 uio_pdrv_genirq.of_id=generic-uio
chosen
bootargs = "console=ttyPS0,115200 root=/dev/mmcblk0p2 rw earlyprintk rootfstype=ext4 rootwait devtmpfs.mount=1 uio_pdrv_genirq.of_id=generic-uio";
;
如下是修改后的 dts 文件，一共开了4个uio 中断，因为有一些中断号被占用，故没使用 62 中断:
/dts-v1/;
/
#address-cells = <0x1>;
#size-cells = <0x1>;
compatible = "xlnx,zynq-7000";
model = "ALINX-AX7010";
chosen
bootargs = "console=ttyPS0,115200 root=/dev/mmcblk0p2 rw earlyprintk rootfstype=ext4 rootwait devtmpfs.mount=1 uio_pdrv_genirq.of_id=generic-uio";
;
aliases
serial0 = "/amba/serial@e0001000";
ethernet0 = "/amba/ethernet@e000b000";
spi0 = "/amba/spi@e000d000";
;
memory
device_type = "memory";
reg = <0x0 0x20000000>;
;
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 = <0x9eb10 0xf4240 0x4f588 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;
//u-boot,dm-pre-reloc;
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>;
linux,phandle = <0x6>;
phandle = <0x6>;
;
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>;
linux,phandle = <0x8>;
phandle = <0x8>;
edt_ft5x06@38
compatible = "edt,edt-ft5406";
reg = <0x38>;
interrupt-parent = <0x3>;
interrupts = <0x0 0x1d 0x4>;
;
;
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", "xlnx,zynq-ddrc-1.0";
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 = "disabled";
clocks = <0x1 0x17 0x1 0x28>;
clock-names = "uart_clk", "pclk";
reg = <0xe0000000 0x1000>;
interrupts = <0x0 0x1b 0x4>;
;
serial@e0001000
compatible = "xlnx,xuartps", "cdns,uart-r1p8";
status = "okay";
clocks = <0x1 0x18 0x1 0x29>;
clock-names = "uart_clk", "pclk";
reg = <0xe0001000 0x1000>;
interrupts = <0x0 0x32 0x4>;
current-speed = <0x1c200>;
device_type = "serial";
port-number = <0x0>;
;
spi@e0006000
compatible = "xlnx,zynq-spi-r1p6";
reg = <0xe0006000 0x1000>;
status = "disabled";
interrupt-parent = <0x3>;
interrupts = <0x0 0x1a 0x4>;
clocks = <0x1 0x19 0x1 0x22>;
clock-names = "ref_clk", "pclk";
#address-cells = <0x1>;
#size-cells = <0x0>;
;
spi@e0007000
compatible = "xlnx,zynq-spi-r1p6";
reg = <0xe0007000 0x1000>;
status = "disabled";
interrupt-parent = <0x3>;
interrupts = <0x0 0x31 0x4>;
clocks = <0x1 0x1a 0x1 0x23>;
clock-names = "ref_clk", "pclk";
#address-cells = <0x1>;
#size-cells = <0x0>;
;
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,m25p80", "w25q256";
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 = <0x6750918>;
local-mac-address = [00 0a 35 00 1e 53];
phy-handle = <0x4>;
mdio
#address-cells = <0x1>;
#size-cells = <0x0>;
phy@1
compatible = "realtek,RTL8211E";
device_type = "ethernet-phy";
reg = <0x1>;
linux,phandle = <0x4>;
phandle = <0x4>;
;
;
;
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 = "disabled";
clock-names = "clk_xin", "clk_ahb";
clocks = <0x1 0x16 0x1 0x21>;
interrupt-parent = <0x3>;
interrupts = <0x0 0x2f 0x4>;
reg = <0xe0101000 0x1000>;
;
slcr@f8000000
#address-cells = <0x1>;
#size-cells = <0x1>;
compatible = "xlnx,zynq-slcr", "syscon", "simple-bus";
reg = <0xf8000000 0x1000>;
ranges;
linux,phandle = <0x5>;
phandle = <0x5>;
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 = <33333333>;
linux,phandle = <0x1>;
phandle = <0x1>;
;
pinctrl@700
compatible = "xlnx,pinctrl-zynq";
reg = <0x700 0x200>;
syscon = <0x5>;
;
;
dmac_s: 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 = <0x5>;
;
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-reset = <0x6 0x2e 0x0>;
usb-phy = <0x7>;
;
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>;
timeout-sec = <0xa>;
;
;
amba_pl
#address-cells = <0x1>;
#size-cells = <0x1>;
compatible = "simple-bus";
ranges;
gpio_btns@41220000
#gpio-cells = <0x2>;
compatible = "xlnx,xps-gpio-1.00.a";
gpio-controller;
reg = <0x41220000 0x10000>;
xlnx,all-inputs = <0x1>;
xlnx,all-inputs-2 = <0x0>;
xlnx,all-outputs = <0x0>;
xlnx,all-outputs-2 = <0x0>;
xlnx,dout-default = <0x0>;
xlnx,dout-default-2 = <0x0>;
xlnx,gpio-width = <0x4>;
xlnx,gpio2-width = <0x20>;
xlnx,interrupt-present = <0x0>;
xlnx,is-dual = <0x0>;
xlnx,tri-default = <0xffffffff>;
xlnx,tri-default-2 = <0xffffffff>;
;
gpio_leds@41210000
#gpio-cells = <0x2>;
compatible = "xlnx,xps-gpio-1.00.a";
gpio-controller;
reg = <0x41210000 0x10000>;
xlnx,all-inputs = <0x0>;
xlnx,all-inputs-2 = <0x0>;
xlnx,all-outputs = <0x1>;
xlnx,all-outputs-2 = <0x0>;
xlnx,dout-default = <0x0>;
xlnx,dout-default-2 = <0x0>;
xlnx,gpio-width = <0x4>;
xlnx,gpio2-width = <0x20>;
xlnx,interrupt-present = <0x0>;
xlnx,is-dual = <0x0>;
xlnx,tri-default = <0xffffffff>;
xlnx,tri-default-2 = <0xffffffff>;
;
dma@43000000
#dma-cells = <0x1>;
compatible = "xlnx,axi-vdma-1.00.a";
reg = <0x43000000 0x10000>;
//xlnx,flush-fsync = <0x1>;
xlnx,num-fstores = <0x1>;
linux,phandle = <0xc>;
phandle = <0xc>;
dma-channel@43000000
compatible = "xlnx,axi-vdma-mm2s-channel";
interrupt-parent = <0x3>;
interrupts = <0x0 0x1e 0x4>;
clocks = <0x1 0x10>;
clock-names = "axis";
xlnx,datawidth = <0x20>;
xlnx,device-id = <0x0>;
;
;
v_tc@43c00000
compatible = "xlnx,v-tc-5.01.a";
interrupt-parent = <0x3>;
interrupts = <0x0 0x1f 0x4>;
reg = <0x43c00000 0x10000>;
xlnx,det-achroma-en = <0x0>;
xlnx,det-avideo-en = <0x1>;
xlnx,det-fieldid-en = <0x0>;
xlnx,det-hblank-en = <0x1>;
xlnx,det-hsync-en = <0x1>;
xlnx,det-vblank-en = <0x1>;
xlnx,det-vsync-en = <0x1>;
xlnx,detect-en = <0x0>;
xlnx,fsync-hstart0 = <0x0>;
xlnx,fsync-hstart1 = <0x0>;
xlnx,fsync-hstart10 = <0x0>;
xlnx,fsync-hstart11 = <0x0>;
xlnx,fsync-hstart12 = <0x0>;
xlnx,fsync-hstart13 = <0x0>;
xlnx,fsync-hstart14 = <0x0>;
xlnx,fsync-hstart15 = <0x0>;
xlnx,fsync-hstart2 = <0x0>;
xlnx,fsync-hstart3 = <0x0>;
xlnx,fsync-hstart4 = <0x0>;
xlnx,fsync-hstart5 = <0x0>;
xlnx,fsync-hstart6 = <0x0>;
xlnx,fsync-hstart7 = <0x0>;
xlnx,fsync-hstart8 = <0x0>;
xlnx,fsync-hstart9 = <0x0>;
xlnx,fsync-vstart0 = <0x0>;
xlnx,fsync-vstart1 = <0x0>;
xlnx,fsync-vstart10 = <0x0>;
xlnx,fsync-vstart11 = <0x0>;
xlnx,fsync-vstart12 = <0x0>;
xlnx,fsync-vstart13 = <0x0>;
xlnx,fsync-vstart14 = <0x0>;
xlnx,fsync-vstart15 = <0x0>;
xlnx,fsync-vstart2 = <0x0>;
xlnx,fsync-vstart3 = <0x0>;
xlnx,fsync-vstart4 = <0x0>;
xlnx,fsync-vstart5 = <0x0>;
xlnx,fsync-vstart6 = <0x0>;
xlnx,fsync-vstart7 = <0x0>;
xlnx,fsync-vstart8 = <0x0>;
xlnx,fsync-vstart9 = <0x0>;
xlnx,gen-achroma-en = <0x0>;
xlnx,gen-achroma-polarity = <0x1>;
xlnx,gen-auto-switch = <0x0>;
xlnx,gen-avideo-en = <0x1>;
xlnx,gen-avideo-polarity = <0x1>;
xlnx,gen-cparity = <0x0>;
xlnx,gen-f0-vblank-hend = <0x500>;
xlnx,gen-f0-vblank-hstart = <0x500>;
xlnx,gen-f0-vframe-size = <0x2ee>;
xlnx,gen-f0-vsync-hend = <0x500>;
xlnx,gen-f0-vsync-hstart = <0x500>;
xlnx,gen-f0-vsync-vend = <0x2d9>;
xlnx,gen-f0-vsync-vstart = <0x2d4>;
xlnx,gen-f1-vblank-hend = <0x500>;
xlnx,gen-f1-vblank-hstart = <0x500>;
xlnx,gen-f1-vframe-size = <0x2ee>;
xlnx,gen-f1-vsync-hend = <0x500>;
xlnx,gen-f1-vsync-hstart = <0x500>;
xlnx,gen-f1-vsync-vend = <0x2d9>;
xlnx,gen-f1-vsync-vstart = <0x2d4>;
xlnx,gen-fieldid-en = <0x0>;
xlnx,gen-fieldid-polarity = <0x1>;
xlnx,gen-hactive-size = <0x500>;
xlnx,gen-hblank-en = <0x1>;
xlnx,gen-hblank-polarity = <0x1>;
xlnx,gen-hframe-size = <0x672>;
xlnx,gen-hsync-en = <0x1>;
xlnx,gen-hsync-end = <0x596>;
xlnx,gen-hsync-polarity = <0x1>;
xlnx,gen-hsync-start = <0x56e>;
xlnx,gen-interlaced = <0x0>;
xlnx,gen-vactive-size = <0x2d0>;
xlnx,gen-vblank-en = <0x1>;
xlnx,gen-vblank-polarity = <0x1>;
xlnx,gen-video-format = <0x2>;
xlnx,gen-vsync-en = <0x1>;
xlnx,gen-vsync-polarity = <0x1>;
xlnx,generate-en = <0x1>;
xlnx,has-axi4-lite = <0x1>;
xlnx,has-intc-if = <0x0>;
xlnx,interlace-en = <0x0>;
xlnx,max-lines = <0x1000>;
xlnx,max-pixels = <0x1000>;
xlnx,num-fsyncs = <0x1>;
xlnx,sync-en = <0x0>;
linux,phandle = <0x9>;
phandle = <0x9>;
;
axi_dynclk@43c10000
compatible = "digilent,axi-dynclk";
#clock-cells = <0x0>;
reg = <0x43c10000 0x10000>;
xlnx,s00-axi-addr-width = <0x5>;
xlnx,s00-axi-data-width = <0x20>;
clocks = <0x1 0xf>;
linux,phandle = <0xb>;
phandle = <0xb>;
;
xilinx_drm
compatible = "xlnx,drm";
xlnx,vtc = <0x9>;
xlnx,connector-type = "HDMIA";
xlnx,encoder-slave = <0xa>;
clocks = <0xb>;
dglnt,edid-i2c = <0x8>;
planes
xlnx,pixel-format = "xrgb8888";
plane0
dmas = <0xc 0x0>;
dma-names = "dma";
;
;
;
digilent_encoder
compatible = "dglnt,drm-encoder";
dglnt,edid-i2c = <0x8>;
linux,phandle = <0xa>;
phandle = <0xa>;
;
;
usb_phy@0
compatible = "usb-nop-xceiv";
#phy-cells = <0x0>;
reset-gpios = <0x6 46 0x1>;
linux,phandle = <0x7>;
phandle = <0x7>;
;
uio@0
compatible="generic-uio";
status="okay";
interrupt-controller;
interrupt-parent=<0x4>;
interrupts=<0x0 0x1d 0x1>;
;
uio@1
compatible="generic-uio";
status="okay";
interrupt-controller;
interrupt-parent=<0x4>;
interrupts=<0x0 0x1f 0x1>;
;
uio@2
compatible="generic-uio";
status="okay";
interrupt-controller;
interrupt-parent=<0x4>;
interrupts=<0x0 0x20 0x1>;
;
uio@3
compatible="generic-uio";
status="okay";
interrupt-controller;
interrupt-parent=<0x4>;
interrupts=<0x0 0x21 0x1>;
;
;
3.2.3 修改 linux kernel
修改linux 内核，增加 linux 对于uio模型的支持。
make menuconfig ARCH=arm CROSS_COMPILE=arm-xilinx-linux-gnueabi-
在配置菜单中 Device Drivers —> Userspace I/O drivers ，配置如图3-1所示，选中 uio 的2个配置。
3.2.4 编译内核和设备树
- 编译内核
make ARCH=arm CROSS_COMPILE=arm-xilinx-linux-gnueabi- uImage LOADADDR=0x00008000
- 编译设备树
./scripts/dtc/dtc -I dts -O dtb -o devicetree.dtb ./arch/arm/boot/dts/AX7010.dts
4 UIO 模型源码分析和测试代码
4.1 uio 模型说明
需要注意的一个问题，uio 模型，在内核层，一收到中断，则立马 disable 中断，这点详见内核代码linux4.0/drivers/uio/uio_pdrv_genirq.c
static irqreturn_t uio_pdrv_genirq_handler(int irq, struct uio_info *dev_info)
struct uio_pdrv_genirq_platdata *priv = dev_info->priv;
/* Just disable the interrupt in the interrupt controller, and
* remember the state so we can allow user space to enable it later.
*/
spin_lock(&priv->lock);
if (!__test_and_set_bit(UIO_IRQ_DISABLED, &priv->flags))
disable_irq_nosync(irq);
spin_unlock(&priv->lock);
return IRQ_HANDLED;
从代码上可以看出，中断一旦触发，立马关闭中断。
然后从 linux4.0/drivers/uio/uio.c 中, 可以看到uio 中断产生后，发送了SIGIO给用户层
/**
* uio_event_notify - trigger an interrupt event
* @info: UIO device capabilities
*/
void uio_event_notify(struct uio_info *info)
struct uio_device *idev = info->uio_dev;
atomic_inc(&idev->event);
wake_up_interruptible(&idev->wait);
kill_fasync(&idev->async_queue, SIGIO, POLL_IN);
EXPORT_SYMBOL_GPL(uio_event_notify);
对于如何开启UIO 中断，则由 linux4.0/drivers/uio/uio.c 中, write 函数实现
写入0，则关闭，写入1则开启。
static ssize_t uio_write(struct file *filep, const char __user *buf,
size_t count, loff_t *ppos)
struct uio_listener *listener = filep->private_data;
struct uio_device *idev = listener->dev;
ssize_t retval;
s32 irq_on;
if (!idev->info->irq)
return -EIO;
if (count != sizeof(s32))
return -EINVAL;
if (!idev->info->irqcontrol)
return -ENOSYS;
if (copy_from_user(&irq_on, buf, count))
return -EFAULT;
retval = idev->info->irqcontrol(idev->info, irq_on);
return retval ? retval : sizeof(s32);
4.2 用户层测试程序
/*======================================================================
beeper driver APP .
All right reserved.
======================================================================*/
#include <stdio.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <fcntl.h>
#include <string.h>
#include <strings.h>
#include <signal.h>
#include <unistd.h>
#include <pthread.h>
#include <fcntl.h>
#include <poll.h>
#include <fcntl.h>
#define UIO_NAME "/dev/uio0"
int fd;
// 信号处理函数
void my_signal_fun(int signum)
char buf[2] = "1";
int on = 1; // uio 使能命令
int count = 4; // uio 中断驱动，必须4字节操作
printf("app get the: %s irq\\n", UIO_NAME);
fflush(stdout);
write(fd, &on, count); // 使能uio中断
int main(int argc, char *argv[])
unsigned char key_val;
int ret;
int Oflags;
// 在应用程序中捕捉SIGIO信号（由驱动程序发送）
signal(SIGIO, my_signal_fun);
fd = open(UIO_NAME, O_RDWR);
if (fd < 0)
printf("can't open file ,file name is %s!\\n", UIO_NAME);
printf("open the %s success\\n", UIO_NAME);
// 将当前进程PID设置为fd文件所对应驱动程序将要发送SIGIO,SIGUSR信号进程PID
fcntl(fd, F_SETOWN, getpid());
// 获取fd的打开方式
Oflags = fcntl(fd, F_GETFL);
// 将fd的打开方式设置为FASYNC --- 即 支持异步通知
// 该行代码执行会触发 驱动程序中 file_operations->fasync 函数
// ------fasync函数调用fasync_helper初始化一个fasync_struct结构体，
// 该结构体描述了将要发送信号的进程PID (fasync_struct->fa_file->f_owner->pid)
fcntl(fd, F_SETFL, Oflags | FASYNC);
while (1)
sleep(1000);
return 0;
编译用户层测试程序
arm-xilinx-linux-gnueabi-gcc -o uio_test uio_app.c
将程序下载到开发板上，然后运行测试
按键触发 irq_f2p 中断, 按键3次，产生3次中断，可以看得到打印信息，说明中断已经完全捕获。
./uio_test
app get the: /dev/uio0
app get the: /dev/uio0
app get the: /dev/uio0
以上是关于zynq7010 在 linux 系统下 irq_f2p 中断驱动的主要内容，如果未能解决你的问题，请参考以下文章