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	 > 嵌入式系統(tǒng) > 設(shè)計(jì)應(yīng)用 > AM335x(TQ335x)學(xué)習(xí)筆記——WM8960聲卡驅(qū)動(dòng)移植
          
    
          

          

          


	
	
	

          
	
          
		
          
			
          AM335x(TQ335x)學(xué)習(xí)筆記——WM8960聲卡驅(qū)動(dòng)移植
          
						
          
				作者：
				時(shí)間：2016-11-28
				來(lái)源：網(wǎng)絡(luò)
				
				
				
				
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          Step3. 調(diào)整WM8960驅(qū)動(dòng)結(jié)構(gòu)
          內(nèi)核中自帶的WM8960驅(qū)動(dòng)結(jié)構(gòu)很舊，編寫(xiě)Machine是需要過(guò)多的了解Codec芯片內(nèi)部細(xì)節(jié)，本文對(duì)WM8960的驅(qū)動(dòng)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(shí)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(duì)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(dòng)內(nèi)部函數(shù)，不作為set_pll接口提供給內(nèi)核驅(qū)動(dòng)（實(shí)際上內(nèi)核驅(qū)動(dòng)也不調(diào)用這個(gè)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(shí)使用的LRCLK是同一個(gè)，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(shí)也會(huì)使能DAC產(chǎn)生LRCLK。
          由于調(diào)試時(shí)間比較長(zhǎng)，可能有些修改我沒(méi)有描述到，完整的wm8960.c文件我會(huì)一并上傳到我的資源，可以下載參考。
          3. 編寫(xiě)Machine驅(qū)動(dòng)
          內(nèi)核代碼有個(gè)很好的例子就是davinci-evm.c，這是am335x-evm評(píng)估板的Machine驅(qū)動(dòng)，該評(píng)估采用的Codec并不是WM8960，因此，我們?cè)谠撐募刑砑覹M8960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(chēng)，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(shí)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(gè)文件是：tq335x.dts、davinci-evm.c和wm8960.c，修改后的這三個(gè)文件我會(huì)上傳到我的資源，如有需要，請(qǐng)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(duì)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(xiàng)，修改后的內(nèi)容如下：
          1. configSND_SOC_WM8960
          2. tristate"WolfsonMicroelectronicsWM8960CODEC"
          3. dependsonI2C&&INPUT
          Step2. 通過(guò)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(dòng)開(kāi)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(guò)上面的三條指令可以啟動(dòng)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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