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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. rtc_tm->tm_min=bcd2bin(rtc_tm->rtc_tm->tm_min=bcd2bin(rtc_tm->tm_min);
  2. rtc_tm->tm_hour=bcd2bin(rtc_tm->tm_hour);
  3. rtc_tm->tm_mday=bcd2bin(rtc_tm->tm_mday);
  4. rtc_tm->tm_mon=bcd2bin(rtc_tm->tm_mon);
  5. rtc_tm->tm_year=bcd2bin(rtc_tm->tm_year);
  7. rtc_tm->tm_year+=100;
  8. rtc_tm->tm_mon-=1;
  10. return0;
  11. }
  13. staticints3c_rtc_settime(structdevice*dev,structrtc_time*tm)
  14. {
  15. void__iomem*base=s3c_rtc_base;
  16. intyear=tm->tm_year-100;
  18. pr_debug("settime%02d.%02d.%02d%02d/%02d/%02d\n",
  19. tm->tm_year,tm->tm_mon,tm->tm_mday,
  20. tm->tm_hour,tm->tm_min,tm->tm_sec);
  22. /*wegetaroundy2kbysimplynotsupportingit*/
  24. if(year<0||year>=100){
  25. dev_err(dev,"rtconlysupports100years\n");
  26. return-EINVAL;
  27. }
  29. writeb(bin2bcd(tm->tm_sec),base+S3C2410_RTCSEC);
  30. writeb(bin2bcd(tm->tm_min),base+S3C2410_RTCMIN);
  31. writeb(bin2bcd(tm->tm_hour),base+S3C2410_RTCHOUR);
  32. writeb(bin2bcd(tm->tm_mday),base+S3C2410_RTCDATE);
  33. writeb(bin2bcd(tm->tm_mon+1),base+S3C2410_RTCMON);
  34. writeb(bin2bcd(year),base+S3C2410_RTCYEAR);
  36. return0;
  37. }

到这里RTC驱动的计时功能实现，报警功能还没有完成。下面是这个驱动源代码

  1. #include
  2. #include
  3. #include
  4. #include
  5. #include
  6. #includeinterrupt.h>
  7. #include
  8. #include
  9. #include
  10. #include
  12. #include
  13. #include
  14. #include
  15. #include
  16. #include
  19. staticstructresource*s3c_rtc_mem;
  21. staticvoid__iomem*s3c_rtc_base;
  23. staticints3c_rtc_tickno=NO_IRQ;
  25. staticDEFINE_SPINLOCK(s3c_rtc_pie_lock);
  28. staticirqreturn_ts3c_rtc_tickirq(intirq,void*id)
  29. {
  30. structrtc_device*rdev=id;
  32. rtc_update_irq(rdev,1,RTC_PF|RTC_IRQF);
  33. returnIRQ_HANDLED;
  34. }
  36. /*Updatecontrolregisters*/
  37. staticvoids3c_rtc_setaie(intto)
  38. {
  39. unsignedinttmp;
  41. pr_debug("%s:aie=%d\n",__func__,to);
  43. tmp=readb(s3c_rtc_base+S3C2410_RTCALM)&~S3C2410_RTCALM_ALMEN;
  45. if(to)
  46. tmp|=S3C2410_RTCALM_ALMEN;
  48. writeb(tmp,s3c_rtc_base+S3C2410_RTCALM);
  49. }
  51. staticints3c_rtc_setpie(structdevice*dev,intenabled)
  52. {
  53. unsignedinttmp;
  55. pr_debug("%s:pie=%d\n",__func__,enabled);
  57. spin_lock_irq(&s3c_rtc_pie_lock);
  58. tmp=readb(s3c_rtc_base+S3C2410_TICNT)&~S3C2410_TICNT_ENABLE;
  60. if(enabled)
  61. tmp|=S3C2410_TICNT_ENABLE;
  63. writeb(tmp,s3c_rtc_base+S3C2410_TICNT);
  64. spin_unlock_irq(&s3c_rtc_pie_lock);
  66. return0;
  67. }
  69. staticints3c_rtc_setfreq(structdevice*dev,intfreq)
  70. {
  71. unsignedinttmp;
  73. spin_lock_irq(&s3c_rtc_pie_lock);
  75. tmp=readb(s3c_rtc_base+S3C2410_TICNT)&S3C2410_TICNT_ENABLE;
  76. tmp|=(128/freq)-1;
  78. writeb(tmp,s3c_rtc_base+S3C2410_TICNT);
  79. spin_unlock_irq(&s3c_rtc_pie_lock);
  81. return0;
  82. }
  84. /*Timeread/write*/
  86. staticints3c_rtc_gettime(structdevice*dev,structrtc_time*rtc_tm)
  87. {
  88. unsignedinthave_retried=0;
  89. void__iomem*base=s3c_rtc_base;
  91. retry_get_time:
  92. rtc_tm->tm_min=readb(base+S3C2410_RTCMIN);
  93. rtc_tm->tm_hour=readb(base+S3C2410_RTCHOUR);
  94. rtc_tm->tm_mday=readb(base+S3C2410_RTCDATE);
  95. rtc_tm->tm_mon=readb(base+S3C2410_RTCMON);
  96. rtc_tm->tm_year=readb(base+S3C2410_RTCYEAR);
  97. rtc_tm->tm_sec=readb(base+S3C2410_RTCSEC);
  99. /*theonlywaytoworkoutwetherthesystemwasmid-update
  100. *whenwereaditistocheckthesecondcounter,andifit
  101. *iszero,thenwere-trytheentireread
  102. */
  104. if(rtc_tm->tm_sec==0&&!have_retried){
  105. have_retried=1;
  106. gotoretry_get_time;
  107. }
  109. pr_debug("readtime%02x.%02x.%02x%02x/%02x/%02x\n",
  110. rtc_tm->tm_year,rtc_tm->tm_mon,rtc_tm->tm_mday,
  111. rtc_tm->tm_hour,rtc_tm->tm_min,rtc_tm->tm_sec);
  113. rtc_tm->tm_sec=bcd2bin(rtc_tm->tm_sec);
  114. rtc_tm->tm_min=bcd2bin(rtc_tm->tm_min);
  115. rtc_tm->tm_hour=bcd2bin(rtc_tm->tm_hour);
  116. rtc_tm->tm_mday=bcd2bin(rtc_tm->tm_mday);
  117. rtc_tm->tm_mon=bcd2bin(rtc_tm->tm_mon);
  118. rtc_tm->tm_year=bcd2bin(rtc_tm->tm_year);
  120. rtc_tm->tm_year+=100;
  121. rtc_tm->tm_mon-=1;
  123. return0;
  124. }
  126. staticints3c_rtc_settime(structdevice*dev,structrtc_time*tm)
  127. {
  128. void__iomem*base=s3c_rtc_base;
  129. intyear=tm->tm_year-100;
  131. pr_debug("settime%02d.%02d.%02d%02d/%02d/%02d\n",
  132. tm->tm_year,tm->tm_mon,tm->tm_mday,
  133. tm->tm_hour,tm->tm_min,tm->tm_sec);
  135. /*wegetaroundy2kbysimplynotsupportingit*/
  137. if(year<0||year>=100){
  138. dev_err(dev,"rtconlysupports100years\n");
  139. return-EINVAL;
  140. }
  142. writeb(bin2bcd(tm->writeb(bin2bcd(tm->tm_sec)

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