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	 > 嵌入式系統(tǒng) > 設(shè)計應(yīng)用 > AM335x(TQ335x)學(xué)習(xí)筆記——WM8960聲卡驅(qū)動移植
      
    
      

      

      


	
	
	

      
	
      
		
      
			
      AM335x(TQ335x)學(xué)習(xí)筆記——WM8960聲卡驅(qū)動移植
      
						
      
				作者：
				時間：2016-11-28
				來源：網(wǎng)絡(luò)
				
				
				
				
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      Step3. 調(diào)整WM8960驅(qū)動結(jié)構(gòu)
      內(nèi)核中自帶的WM8960驅(qū)動結(jié)構(gòu)很舊，編寫Machine是需要過多的了解Codec芯片內(nèi)部細(xì)節(jié)，本文對WM8960的驅(qū)動結(jié)構(gòu)進(jìn)行了調(diào)整，可以使Machine忽略Codec的內(nèi)部細(xì)節(jié)。
      修改的大體內(nèi)容如下：
      (1) 添加set_sysclk函數(shù)，接收Machine設(shè)置的sysclk時鐘頻率。具體本文就是DTS中設(shè)置的24576000。
      (2) 在hw_params中添加BCLK、DACCLK、ADCCLK的配置操作。hw_params可以根據(jù)參數(shù)和sysclk對以上參數(shù)進(jìn)行設(shè)置，放在這里很合適。
      (3) 去除函數(shù)wm8960_set_dai_clkdiv，并將wm8960_set_dai_pll設(shè)置為驅(qū)動內(nèi)部函數(shù)，不作為set_pll接口提供給內(nèi)核驅(qū)動（實(shí)際上內(nèi)核驅(qū)動也不調(diào)用這個函數(shù)）。
      Step4. 修改WM8960的route信息
      根據(jù)TQ335x的原理圖可知，使用WM8960進(jìn)行錄音或放音時使用的LRCLK是同一個，都是DACCLK，故在snd_soc_dapm_route添加如下兩行信息：
      1. {"LeftDAC",NULL,"LeftInputMixer"},
      2. {"RightDAC",NULL,"RightInputMixer"},
      這樣在錄音時也會使能DAC產(chǎn)生LRCLK。
      由于調(diào)試時間比較長，可能有些修改我沒有描述到，完整的wm8960.c文件我會一并上傳到我的資源，可以下載參考。
      3. 編寫Machine驅(qū)動
      內(nèi)核代碼有個很好的例子就是davinci-evm.c，這是am335x-evm評估板的Machine驅(qū)動，該評估采用的Codec并不是WM8960，因此，我們在該文件中添加WM8960信息即可。具體的修改如下：
      Step1. 添加compatible信息。修改后的內(nèi)容如下：
      1. staticconststructof_device_iddavinci_evm_dt_ids[]={
      2. {
      3. .compatible="ti,tq-evm-audio",
      4. .data=(void*)&evm_dai_wm8960,
      5. },
      6. {
      7. .compatible="ti,da830-evm-audio",
      8. .data=(void*)&evm_dai_tlv320aic3x,
      9. },
      10. {/*sentinel*/}
      11. };
      Step2. 實(shí)現(xiàn)em_dai_wm8960。需要添加如下代碼：
      1. staticstructsnd_soc_dai_linkevm_dai_wm8960={
      2. .name="wm8960",
      3. .stream_name="wm8960-hifi",
      4. .codec_dai_name="wm8960-hifi",
      5. .ops=&evm_wm8960_ops,
      6. .init=evm_wm8960_init,
      7. .dai_fmt=SND_SOC_DAIFMT_I2S|SND_SOC_DAIFMT_CBM_CFM|
      8. SND_SOC_DAIFMT_NB_NF,
      9. };
      含義：
      (1) codec_dai_name = "wm8960-hifi" --> 指定codec設(shè)備名稱，與wm8960.c中指定的相同即可。
      (2) ops --> 指定wm8960的各種操作函數(shù)，本文僅實(shí)現(xiàn)了hw_params函數(shù)。
      (3) init --> 指定wm8960的初始化函數(shù)，主要是完成dapm相關(guān)的初始化。
      (4) dai_fmt --> 指定音頻的接口方式、主從關(guān)系和時鐘翻轉(zhuǎn)信息。SND_SOC_DAIFMT_I2S表示音頻接口采用I2S協(xié)議；SND_SOC_DAIFMT_CBM_CFM表示Codec的BCLK為Master，LRCLK為Master，即wm8960為主，AM335x為從；SND_SOC_DAIFMT_NB_NF表示BCLK和LRCLK都不需要翻轉(zhuǎn)。
      Step3.實(shí)現(xiàn)evm_wm8960_init
      這一部分主要是dapm相關(guān)的設(shè)置，本人理解也不是非常深刻，直接貼上代碼，具體如下：
      1. staticconststructsnd_soc_dapm_widgetevm_wm8960_dapm_widgets[]={
      2. SND_SOC_DAPM_SPK("AudioOut1",NULL),
      3. SND_SOC_DAPM_MIC("myMic",NULL),
      4. SND_SOC_DAPM_MIC("myLineIN",NULL),
      5. };
      7. staticconststructsnd_kcontrol_newevm_wm8960_controls[]={
      8. SOC_DAPM_PIN_SWITCH("AudioOut1"),
      9. SOC_DAPM_PIN_SWITCH("myMic"),
      10. SOC_DAPM_PIN_SWITCH("myLineIN"),
      11. };
      13. staticconststructsnd_soc_dapm_routeevm_wm8960_audio_map[]={
      14. /*Connectionstothe...*/
      15. {"AudioOut1",NULL,"HP_L"},
      16. {"AudioOut1",NULL,"HP_R"},
      18. /*Mic*/
      19. {"LINPUT1",NULL,"MICB"},
      20. {"MICB",NULL,"myMic"},
      22. /*Linein*/
      23. {"LINPUT3",NULL,"myLineIN"},
      24. {"RINPUT3",NULL,"myLineIN"},
      25. };
      27. staticintevm_wm8960_init(structsnd_soc_pcm_runtime*rtd)
      28. {
      29. interr;
      30. structsnd_soc_codec*codec=rtd->codec;
      31. structsnd_soc_dapm_context*dapm=&codec->dapm;
      33. snd_soc_dapm_new_controls(dapm,evm_wm8960_dapm_widgets,
      34. ARRAY_SIZE(evm_wm8960_dapm_widgets));
      36. err=snd_soc_add_codec_controls(codec,evm_wm8960_controls,
      37. ARRAY_SIZE(evm_wm8960_controls));
      39. if(err<0)
      40. returnerr;
      42. snd_soc_dapm_add_routes(dapm,evm_wm8960_audio_map,
      43. ARRAY_SIZE(evm_wm8960_audio_map));
      45. snd_soc_dapm_enable_pin(dapm,"AudioOut1");
      46. snd_soc_dapm_enable_pin(dapm,"myMic");
      48. snd_soc_dapm_sync(dapm);
      50. return0;
      51. }
      Step4. 實(shí)現(xiàn)evm_wm8960_ops及相關(guān)函數(shù)，需要添加如下代碼：
      1. staticintevm_wm8960_hw_params(structsnd_pcm_substream*substream,
      2. structsnd_pcm_hw_params*params)
      3. {
      4. structsnd_soc_pcm_runtime*rtd=substream->private_data;
      5. structsnd_soc_dai*codec_dai=rtd->codec_dai;
      6. structsnd_soc_dai*cpu_dai=rtd->cpu_dai;
      7. structsnd_soc_card*soc_card=rtd->card;
      8. intret=0;
      9. unsignedsysclk=((structsnd_soc_card_drvdata_davinci*)
      10. snd_soc_card_get_drvdata(soc_card))->sysclk;
      12. /*setthecodecsystemclock*/
      13. ret=snd_soc_dai_set_sysclk(codec_dai,0,sysclk,SND_SOC_CLOCK_IN);
      14. if(ret<0)
      15. returnret;
      17. /*settheCPUsystemclock*/
      18. ret=snd_soc_dai_set_sysclk(cpu_dai,0,sysclk,SND_SOC_CLOCK_IN);
      19. if(ret<0)
      20. returnret;
      22. return0;
      23. }
      25. staticstructsnd_soc_opsevm_wm8960_ops={
      26. .startup=evm_startup,
      27. .shutdown=evm_shutdown,
      28. .hw_params=evm_wm8960_hw_params,
      29. };
      至此，就完成了代碼移植的全部工作，修改涉及到的三個文件是：tq335x.dts、davinci-evm.c和wm8960.c，修改后的這三個文件我會上傳到我的資源，如有需要，請去我的資源中下載。
      4. 配置內(nèi)核
      完成了代碼的移植工作之后還需要對內(nèi)核進(jìn)一步配置。默認(rèn)的內(nèi)核將ALSA作為module加載，本文將編譯進(jìn)內(nèi)核。具體步驟如下：
      Step1. 修改sound/soc/codecs/Kconfig，添加wm8960編譯選項，修改后的內(nèi)容如下：
      1. configSND_SOC_WM8960
      2. tristate"WolfsonMicroelectronicsWM8960CODEC"
      3. dependsonI2C&&INPUT
      Step2. 通過menuconfig配置內(nèi)核
      執(zhí)行指令：
      1. makeARCH=armCROSS_COMPILE=arm-linux-gnueabi-menuconfig
      進(jìn)行如下修改：
      1. DeviceDrivers--->
      2. <*>Soundcardsupport--->
      3. <*>AdvancedLinuxSoundArchitecture--->
      4. <*>ALSAforSoCaudiosupport--->
      5. <*>SoCAudioforTexasInstrumentschipsusingeDMA(AM33XX/43XX)
      6. -*-MultichannelAudioSerialPort(McASP)support
      7. <*>SoCAudiofortheAM33XXchipbasedboards
      8. CODECdrivers--->
      9. <*>WolfsonMicroelectronicsWM8960CODEC
      重新編譯內(nèi)核：
      1. makeARCH=armCROSS_COMPILE=arm-linux-gnueabi--j8
      5. 效果將編譯后的內(nèi)核文件zImage和tq335x.dtb文件拷貝SD卡并啟動開發(fā)板，按任意鍵進(jìn)入uboot命令模式，輸入如下指令：
      1. loadmmc0:10x88000000/boot/tq335x.dtb
      2. loadmmc0:10x82000000/boot/zImage
      3. bootz0x82000000-0x88000000
      通過上面的三條指令可以啟動內(nèi)核，完整的Log信息如下：
      1. Startingkernel...
      3. [0.000000]BootingLinuxonphysicalCPU0x0
      4. [0.000000]Linuxversion3.17.2(lilianrong@smarter)(gccversion4.7.3(Ubuntu/Linaro4.7.3-12ubuntu1))#68SMPSatDec2000:03:09CST2014
      5. [0.000000]CPU:ARMv7Processor[413fc082]revision2(ARMv7),cr=10c5387d
      6. [0.000000]CPU:PIPT/VIPTnonaliasingdatacache,VIPTaliasinginstructioncache
      7. [0.000000]Machinemodel:TIAM335xEVM
      8. [0.000000]cma:Reserved16MiBat9e800000
      9. [0.000000]Memorypolicy:Datacachewriteback
      10. [0.000000]HighMemzone:1048574pagesexceedsfreesize0
      11. [0.000000]CPU:AllCPU(s)startedinSVCmode.
      12. [0.000000]AM335XES2.1(sgxneon)
      13. [0.000000]PERCPU:Embedded9pages/cpu@dfa99000s14336r8192d14336u36864
      14. [0.000000]Built1zonelistsinZoneorder,mobilitygroupingon.Totalpages:129792
      15. [0.000000]Kernelcommandline:console=ttyO0,115200n8root=/dev/mmcblk0p2rwrootfstype=ext3rootwait
      16. [0.000000]PIDhashtableentries:2048(order:1,8192bytes)
      17. [0.000000]Dentrycachehashtableentries:65536(order:6,262144bytes)
      18. [0.000000]Inode-cachehashtableentries:32768(order:5,131072bytes)
      19. [0.000000]Memory:484124K/523264Kavailable(6070Kkernelcode,666Krwdata,2444Krodata,410Kinit,8214Kbss,39140Kreserved,0Khighmem)
      20. [0.000000]Virtualkernelmemorylayout:
      21. [0.000000]vector:0xffff0000-0xffff1000(4kB)
      22. [0.000000]fixmap:0xffc00000-0xffe00000(2048kB)
      23. [0.000000]vmalloc:0xe0800000-0xff000000(488MB)
      24. [0.000000]lowmem:0xc0000000-0xe0000000(512MB)
      25. [0.000000]pkmap:0xbfe00000-0xc0000000(2MB)
      26. [0.000000]modules:0xbf000000-0xbfe00000(14MB)
      27. [0.000000].text:0xc0008000-0xc0858bc0(8515kB)
      28. [0.000000].init:0xc0859000-0xc08bf800(410kB)
      29. [0.000000].data:0xc08c0000-0xc0966b50(667kB)
      30. [0.000000].bss:0xc0966b50-0xc116c6e0(8215kB)
      31. [0.000000]HierarchicalRCUimplementation.
      32. [0.000000]RCUrestrictingCPUsfromNR_CPUS=2tonr_cpu_ids=1.
      33. [0.000000]RCU:Adjustinggeometryforrcu_fanout_leaf=16,nr_cpu_ids=1
      34. [0.000000]NR_IRQS:16nr_irqs:1616
      35. [0.000000]IRQ:FoundanINTCat0xfa200000(revision5.0)with128interrupts
      36. [0.000000]Totalof128interruptson1activecontroller
      37. [0.000000]OMAPclockeventsource:timer2at24000000Hz
      38. [0.000015]sched_clock:32bitsat24MHz,resolution41ns,wrapsevery178956969942ns
      39. [0.000061]OMAPclocksource:timer1at24000000Hz
      40. [0.000798]Console:colourdummydevice80x30
      41. [0.000849]Lockdependencyvalidator:Copyright(c)2006RedHat,Inc.,IngoMolnar
      42. [0.000858]...MAX_LOCKDEP_SUBCLASSES:8
      43. [0.000865]...MAX_LOCK_DEPTH:48
      44. [0.000873]...MAX_LOCKDEP_KEYS:8191
      45. [0.000880]...CLASSHASH_SIZE:4096
      46. [0.000887]...MAX_LOCKDEP_ENTRIES:32768
      47. [0.000894]...MAX_LOCKDEP_CHAINS:65536
      48. [0.000901]...CHAINHASH_SIZE:32768
      49. [0.000909]memoryusedbylockdependencyinfo:5167kB
      50. [0.000916]pertask-structmemoryfootprint:1152bytes
      51. [0.000956]Calibratingdelayloop...996.14BogoMIPS(lpj=4980736)
      52. [0.079039]pid_max:default:32768minimum:301
      53. [0.079431]SecurityFrameworkinitialized
      54. [0.079555]Mount-cachehashtableentries:1024(order:0,4096bytes)
      55. [0.079568]Mountpoint-cachehashtableentries:1024(order:0,4096bytes)
      56. [0.081736]CPU:Testingwritebuffercoherency:ok
      57. [0.082916]CPU0:thread-1,cpu0,socket-1,mpidr0
      58. [0.083033]Settingupstaticidentitymapfor0x805bf4f0-0x805bf560
      59. [0.086259]Broughtup1CPUs
      60. [0.086278]SMP:Totalof1processorsactivated.
      61. [0.086288]CPU:AllCPU(s)startedinSVCmode.
      62. [0.088875]devtmpfs:initialized
      63. [0.097689]VFPsupportv0.3:implementor41architecture3part30variantcrev3
      64. [0.133508]omap_hwmod:tptc0usingbrokendtdatafromedma
      65. [0.133865]omap_hwmod:tptc1usingbrokendtdatafromedma
      66. [0.134203]omap_hwmod:tptc2usingbrokendtdatafromedma
      67. [0.142102]omap_hwmod:debugss:_wait_target_disablefailed
      68. [0.200093]pinctrlcore:initializedpinctrlsubsystem
      69. [0.202608]regulator-dummy:noparameters
      70. [0.232298]NET:Registeredprotocolfamily16
      71. [0.240800]DMA:preallocated256KiBpoolforatomiccoherentallocations
      72. [0.243054]cpuidle:usinggovernorladder
      73. [0.243083]cpuidle:usinggovernormenu
      74. [0.255025]OMAPGPIOhardwareversion0.1
      75. [0.270226]omap-gpmc50000000.gpmc:couldnotfindpctldevfornode/pinmux@44e10800/nandflash_pins_s0,deferringprobe
      76. [0.270268]platform50000000.gpmc:Driveromap-gpmcrequestsprobedeferral
      77. [0.274762]hw-breakpoint:debugarchitecture0x4unsupported.
      78. [0.319722]edma-dma-engineedma-dma-engine.0:TIEDMADMAenginedriver
      79. [0.321054]vbat:5000mV
      80. [0.321851]lis3_reg:noparameters
      81. [0.325260]SCSIsubsysteminitialized
      82. [0.326060]usbcore:registerednewinterfacedriverusbfs
      83. [0.326235]usbcore:registerednewinterfacedriverhub
      84. [0.330180]usbcore:registerednewdevicedriverusb				   
				
            
                
			
							
        
                
			            
                            
              
            
      
		
      
		
      
		
      
		
      
		
      
			
        
				
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