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ARM-Linux驱动--RTC(实时时钟)驱动分析

时间：11-20 来源：互联网 点击：

  1. writeb(bin2bcd(tm->writeb(bin2bcd(tm->tm_sec),base+S3C2410_RTCSEC);
  2. writeb(bin2bcd(tm->tm_min),base+S3C2410_RTCMIN);
  3. writeb(bin2bcd(tm->tm_hour),base+S3C2410_RTCHOUR);
  4. writeb(bin2bcd(tm->tm_mday),base+S3C2410_RTCDATE);
  5. writeb(bin2bcd(tm->tm_mon+1),base+S3C2410_RTCMON);
  6. writeb(bin2bcd(year),base+S3C2410_RTCYEAR);
  8. return0;
  9. }
  11. staticints3c_rtc_open(structdevice*dev)
  12. {
  13. structplatform_device*pdev=to_platform_device(dev);
  14. structrtc_device*rtc_dev=platform_get_drvdata(pdev);
  15. intret;
  17. ret=request_irq(s3c_rtc_tickno,s3c_rtc_tickirq,
  18. IRQF_DISABLED,"s3c2410-rtctick",rtc_dev);
  20. if(ret){
  21. dev_err(dev,"IRQ%derror%d\n",s3c_rtc_tickno,ret);
  22. gototick_err;
  23. }
  25. tick_err:
  26. returnret;
  27. }
  29. staticvoids3c_rtc_release(structdevice*dev)
  30. {
  31. structplatform_device*pdev=to_platform_device(dev);
  32. structrtc_device*rtc_dev=platform_get_drvdata(pdev);
  34. /*donotclearAIEhere,itmaybeneededforwake*/
  36. s3c_rtc_setpie(dev,0);
  37. free_irq(s3c_rtc_tickno,rtc_dev);
  38. }
  40. staticconststructrtc_class_opss3c_rtcops={
  41. .open=s3c_rtc_open,
  42. .release=s3c_rtc_release,
  43. .read_time=s3c_rtc_gettime,
  44. .set_time=s3c_rtc_settime,
  45. .irq_set_freq=s3c_rtc_setfreq,
  46. .irq_set_state=s3c_rtc_setpie,
  47. };
  49. staticvoids3c_rtc_enable(structplatform_device*pdev,inten)
  50. {
  51. void__iomem*base=s3c_rtc_base;
  52. unsignedinttmp;
  54. if(s3c_rtc_base==NULL)
  55. return;
  57. if(!en){
  58. tmp=readb(base+S3C2410_RTCCON);
  59. writeb(tmp&~S3C2410_RTCCON_RTCEN,base+S3C2410_RTCCON);
  61. tmp=readb(base+S3C2410_TICNT);
  62. writeb(tmp&~S3C2410_TICNT_ENABLE,base+S3C2410_TICNT);
  63. }else{
  64. /*re-enablethedevice,andcheckitisok*/
  66. if((readb(base+S3C2410_RTCCON)&S3C2410_RTCCON_RTCEN)==0){
  67. dev_info(&pdev->dev,"rtcdisabled,re-enabling\n");
  69. tmp=readb(base+S3C2410_RTCCON);
  70. writeb(tmp|S3C2410_RTCCON_RTCEN,base+S3C2410_RTCCON);
  71. }
  73. if((readb(base+S3C2410_RTCCON)&S3C2410_RTCCON_CNTSEL)){
  74. dev_info(&pdev->dev,"removingRTCCON_CNTSEL\n");
  76. tmp=readb(base+S3C2410_RTCCON);
  77. writeb(tmp&~S3C2410_RTCCON_CNTSEL,base+S3C2410_RTCCON);
  78. }
  80. if((readb(base+S3C2410_RTCCON)&S3C2410_RTCCON_CLKRST)){
  81. dev_info(&pdev->dev,"removingRTCCON_CLKRST\n");
  83. tmp=readb(base+S3C2410_RTCCON);
  84. writeb(tmp&~S3C2410_RTCCON_CLKRST,base+S3C2410_RTCCON);
  85. }
  86. }
  87. }
  89. staticint__devexits3c_rtc_remove(structplatform_device*dev)
  90. {
  91. structrtc_device*rtc=platform_get_drvdata(dev);
  93. platform_set_drvdata(dev,NULL);
  94. rtc_device_unregister(rtc);
  96. s3c_rtc_setpie(&dev->dev,0);
  97. s3c_rtc_setaie(0);
  99. iounmap(s3c_rtc_base);
  100. release_resource(s3c_rtc_mem);
  101. kfree(s3c_rtc_mem);
  103. return0;
  104. }
  106. staticint__devinits3c_rtc_probe(structplatform_device*pdev)
  107. {
  108. structrtc_device*rtc;
  109. structresource*res;
  110. intret;
  112. pr_debug("%s:probe=%p\n",__func__,pdev);
  114. /*findtheIRQs*/
  116. s3c_rtc_tickno=platform_get_irq(pdev,1);
  117. if(s3c_rtc_tickno<0){
  118. dev_err(&pdev->dev,"noirqforrtctick\n");
  119. return-ENOENT;
  120. }
  122. /*getthememoryregion*/
  124. res=platform_get_resource(pdev,IORESOURCE_MEM,0);
  125. if(res==NULL){
  126. dev_err(&pdev->dev,"failedtogetmemoryregionresource\n");
  127. return-ENOENT;
  128. }
  130. s3c_rtc_mem=request_mem_region(res->start,
  131. res->end-res->start+1,
  132. pdev->name);
  134. if(s3c_rtc_mem==NULL){
  135. dev_err(&pdev->dev,"failedtoreservememoryregion\n");
  136. ret=-ENOENT;
  137. gotoerr_nores;
  138. }
  140. s3c_rtc_base=ioremap(res->start,res->end-res->start+1);
  141. if(s3c_rtc_base==NULL){
  142. dev_err(&pdev->dev,"failedioremap()\n");
  143. ret=-EINVAL;
  144. gotoerr_nomap;
  145. }
  147. /*checktoseeifeverythingissetupcorrectly*/
  149. s3c_rtc_enable(pdev,1);
  151. pr_debug("s3c2410_rtc:RTCCON=%02x\n",
  152. readb(s3c_rtc_base+S3C2410_RTCCON));
  154. s3c_rtc_setfreq(&pdev->dev,1);
  156. /*registerRTCandexit*/
  158. rtc=rtc_device_register("s3c",&pdev->dev,&s3c_rtcops,
  159. THIS_MODULE);
  161. if(IS_ERR(rtc)){
  162. dev_err(&pdev->dev,"cannotattachrtc\n");
  163. ret=PTR_ERR(rtc);
  164. gotoerr_nortc;
  165. }
  167. rtc->max_user_freq=128;
  169. platform_set_drvdata(pdev,rtc);
  170. return0;
  172. err_nortc:
  173. s3c_rtc_enable(pdev,0);
  174. iounmap(s3c_rtc_base);
  176. err_nomap:
  177. release_resource(s3c_rtc_mem);
  178. err_nores:
  179. returnret;
  180. }
  182. staticstructplatform_drivers3c2410_rtc

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