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zynq7010 在 linux 系统下 irq_f2p 中断驱动_zynq7010开发linux驱动
作者：weixin_40725706 | 2024-07-28 05:15:47
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zynq7010开发linux驱动
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>;
};
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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>;
};
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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";
};
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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>; }; };
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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-
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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
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- 编译设备树
./scripts/dtc/dtc -I dts -O dtb -o devicetree.dtb ./arch/arm/boot/dts/AX7010.dts
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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;
}
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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);
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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); }
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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; }
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编译用户层测试程序
arm-xilinx-linux-gnueabi-gcc -o uio_test uio_app.c
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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
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