8-3-omapl138内核驱动源码说明_W

1、OMAPL138内核驱动源码说明1. OMAPL138 SOC 平台设备文件：22. 外设驱动路径22.1 串口驱动（TL16754 多串口模块）： 22.2 网口驱动：22.3 Nandflash 驱动（基于 EMIFA 总线）： 22.4 看门狗驱动：32.5 RTC 驱动：32.6 LCDC 驱动：32.7 Vpif 总线 ov2640 和 tvp5147 驱动：32.8 Spi 总线驱动：32.9 Usb2.0 驱动：32.10 usb1.1 驱动32.11 Mmc 驱动：32.12 I2c 总线驱动：42.13 Gpio 驱动：42.14 音频驱动（基于 mcasp）： 42.15

2、Ad7606 驱动：42.16 Sata 驱动：42.17 DA5724 驱动：42.18 ecap 和 ehrpwm 驱动：42.19 mcbsp 驱动：4公司官网： 技术论坛：销售邮箱： 技术邮箱：公司总机：020-8998-6280 技术热线：020-3893-97341/161.OMAPL138 SOC 平台设备文件：arch/arm/mach-davinci/clock.carch/arm/mach-davinci/da850.carch/arm/mach

3、-davinci/cp_intc.carch/arm/mach-davinci/cpuidle.carch/arm/mach-davinci/pm.carch/arm/mach-davinci/common.carch/arm/mach-davinci/cpufreq.carch/arm/mach-davinci/time.carch/arm/mach-davinci/mux.carch/arm/mach-davinci/irq.carch/arm/mach-davinci/devices-da8xx.carch/arm/mach-davinci/dma.carch/arm/mach-davi

4、nci/serial.carch/arm/mach-davinci/board-da850-evm.carch/arm/mach-davinci/psc.carch/arm/mach-davinci/devices.carch/arm/mach-davinci/usb.carch/arm/mach-davinci/sram.c2. 外设驱动路径2.1 串口驱动（TL16754 多串口模块）：drivers/tty/serial/8250/8250.c2.2 网口驱动：drivers/net/ethernet/ti/davinci_emac.cdrivers/net/ethernet/ti/da

5、vinci_cpdma.cdrivers/net/ethernet/ti/davinci_mdio.c2.3 Nandflash 驱动（基于 EMIFA 总线）：drivers/mfd/davinci_aemif.c公司官网： 技术论坛：销售邮箱： 技术邮箱：公司总机：020-8998-6280 技术热线：020-3893-97342/16drivers/mtd/nand/davinci_nand.c2.4 看门狗驱动：drivers/watchdog/davinc

6、i_wdt.c2.5 RTC 驱动：drivers/rtc/rtc-davinci.c2.6 LCDC 驱动：drivers/video/da8xx-fb.c2.7 Vpif 总线 ov2640 和 tvp5147 驱动：drivers/media/video/davinci/vpif_capture.cdrivers/media/video/davinci/vpif.cdrivers/media/video/davinci/vpif_display.cdrivers/media/video/ov2640.cdrivers/media/video/tvp514x.cdrivers/media/

7、video/tvp514x_regs.h2.8 Spi 总线驱动：drivers/spi/spi-davinci.c2.9 Usb2.0 驱动：drivers/usb/musb/davinci.cdrivers/usb/musb/da8xx.cdrivers/usb/musb/cppi41.hdrivers/usb/musb/cppi41.cdrivers/usb/musb/cppi41_dma.c2.10 usb1.1 驱动drivers/usb/host/ohci-da8xx.c2.11 Mmc 驱动：drivers/mmc/host/davinci_mmc.c公司官网：www.tronl

8、 技术论坛：销售邮箱： 技术邮箱：公司总机：020-8998-6280 技术热线：020-3893-97343/162.12 I2c 总线驱动：drivers/i2c/busses/i2c-davinci.c2.13 Gpio 驱动：drivers/gpio/gpio-davinci.c2.14 音频驱动（基于 mcasp）：sound/soc/davinci/davinci-i2s.csound/soc/davinci/davinci-evm.csound/soc/davinci/

9、davinci-mcasp.csound/soc/davinci/davinci-pcm.c2.15 Ad7606 驱动：drivers/staging/iio/adc/ad7606_spi.cdrivers/staging/iio/adc/ad7606_par.c2.16 Sata 驱动：drivers/ata/ahci.cdrivers/ata/ahci_platform.c2.17 DA5724 驱动：drivers/staging/iio/dac/ad5724r_spi.cdrivers/staging/iio/dac/ad5724r.h2.18 ecap 和 ehrpwm 驱动：dr

10、ivers/pwm/ecap.cdrivers/pwm/ecap_cap.cdrivers/pwm/ehrpwm.c2.19 mcbsp 驱动：sound/soc/davinci/davinci-evm.csound/soc/davinci/davinci-i2s.c公司官网： 技术论坛：销售邮箱： 技术邮箱：公司总机：020-8998-6280 技术热线：020-3893-97344/16SPI Flash DriverAbstractThis chapter d

11、escribes the SPI flash driver architecture, driver features and performance numbers (throughputand CPU load).Introduction (drivers/spi/spi-davinci.c)SPI Flash driver is implemented as block driver and compliant with standard MTD driver. It supports variousflash devices. The SPI driver creates device

12、 node for user space access (example, /dev/mtd1). 公司官网： 技术论坛：销售邮箱： 技术邮箱：公司总机：020-8998-6280 技术热线：020-3893-97345/16Driver FeaturesDMA and PIO modes are supported.Supported System CallsSupports the system call support proivided by MTD int

13、erface viz. open(), close(), read(), write(), ioctl()MMC/SD DriverThis chapter provides details on MMC/SD driver along with throughput and CPU load numbers.Introduction (drivers/mmc/host/davinci_mmc.c)The MMC controller provides an interface to external MMC cards that follow the MMC specification v4

14、.0. TheMMCdriverisimplementedasablockdriver.Blockdevicenodes(suchas/dev/mmcblockp1,公司官网： 技术论坛：销售邮箱： 技术邮箱：公司总机：020-8998-6280 技术热线：020-3893-97346/16/dev/mmcblockp2) are created for user space access.Abstract Driver FeaturesLinux file sys

15、tem and generic MMC layer abstract details of block devices (MMC)High-speed (SDv1.1) and High Capacity (SDv2.0) cardsSupport for 1/4 bit modesSupport for card detect and Write protect featuresConstraints公司官网： 技术论坛：销售邮箱： 技术邮箱：公司总机：020-8

16、998-6280 技术热线：020-3893-97347/16 DMA and polled mode for data transfer operations MMC/SD native protocol command/response set Single/multiple block data transfersThe driver supports the following features:MMC/SD cards should not be removed when the mount operation is in progress. If done so, dataSupp

17、orted System Callsopen(),close(),read(),write()UART DriverThis chapter provides details on UART driver.Introduction (drivers/tty/serial/8250/8250.c)The UART driver is implemented as a serial driver, and can be accessed from user space as /dev/ttyS2. Driver FeaturesThe driver supports the following f

18、eatures:公司官网： 技术论坛：销售邮箱： 技术邮箱：公司总机：020-8998-6280 技术热线：020-3893-97348/16Abstractintegrity cannot be guaranteed.Supported System Callsopen(),close(),read(),write(),ioctl()I2C DriverAbstractIntroduction (drivers/i2c/busses/i2c-davinci.c)T

19、he I2C peripheral is compliant with the Philips Semiconductor I2C-bus specification version 2.1. The I2Cdriver is implemented as a serial driver. The I2C driver can be accessed from the user space as /dev/i2c/0. 公司官网： 技术论坛：销售邮箱： 技术邮箱：公

20、司总机：020-8998-6280 技术热线：020-3893-97349/16This chapter provides details on I2C driver. Only UART2 is physically available on EVM boardDriver FeaturesThe driver supports the following features:7-bit addressing modeFast modeFeatures Not Supported7-bit and 10-bit addressing combined format is not support

21、edDMA mode is not supportedSupported System CallsWatchdog(WDT) DriverIntroduction (drivers/char/watchdog/davinci_wdt.c)DaVinci SoCs have a 64-bit watchdog timer which can be used to reset the hardware in case of a softwarefault. Once the /dev/watchdog is opened, it will reboot the system unless a us

22、er space daemon resets thetimer at regular intervals within a certain timeout period. The WDT driver is registered as a misc device.公司官网： 技术论坛：销售邮箱： 技术邮箱：公司总机：020-8998-6280 技术热线：020-3893-973410/16Default timeout of this driver is 60 se

23、conds.AbstractThis chapter provides details on Watchdog timer driver.open(),close(),read(),write(),ioctl() Interrupt mode Driver FeaturesThe driver supports the following features:Supports IOCTLs to set/get the timeout value, ping the watchdog & query the watchdog structureConstraintsOnce /dev/watch

24、dog is opened, closing it doesnt disable the watchdogSupported System Callsopen(), close(), write(), read()USB DriverAbstract公司官网： 技术论坛：销售邮箱： 技术邮箱：公司总机：020-8998-6280 技术热线：020-3893-973411/16info. Driver can be built as a loadable module

25、 and inserted dynamically.This chapter describes the USB (EHCI and MUSB) driver architecture, features supported/not supported,constraints and performance numbers.OHCI ControllerDriver FeaturesMass Storage Class (MSC)Hub ClassUSB Video Class (UVC)USB Audio Class (UAC)Features Not SupportedMUSB OTG c

26、ontrollerDescriptionThe MUSB driver is implemented on top of Mentor OTG IP version 1.8 which supports all the speeds (High,Full and Low (host mode only). On DA850/OMAP-L138, MUSB uses CPPI 4.1 DMA for all the transfers onDriver FeaturesThe driver supports the following features公司官网：

27、技术论坛：销售邮箱： 技术邮箱：公司总机：020-8998-6280 技术热线：020-3893-973412/16other devices CPPI 3.0 DMA is used.All other classes not mentioned in the Supported Features section. Human Interface Class (HID)The driver supports the following featuresThis chapter provides

28、details on OHCI and MUSB drivers along with throughput and CPU load numbers.Human Interface Class (HID)Mass Storage Class (MSC)Hub ClassUSB Video Class (UVC)Mass Storage Class (MSC)USB Networking - RNDIS/CDCFeatures Not SupportedUSB Mass Storage Class Host DriverDriver FeaturesThe driver supports th

29、e following featureDMA modeSupported SystemCallsopen(), close(), read(), write(), ioctl()公司官网： 技术论坛：销售邮箱： 技术邮箱：公司总机：020-8998-6280 技术热线：020-3893-973413/16 PIO mode OTG Modular support for host/device mode.Gadget mode USB Audio Class (UAC)Host ModeUSB Mass Storage Class Slave DriverDescriptionThis figure illustrates the stack diagram of the system with USB File Storage Gadget driver Driver FeaturesThe driver supports the following featureDMA m