• ./rtc_app w 2017 08 25 18 36 20
• ./rtc_app r [times]
  */
  struct rtc_struct {
  int year;
  int month;
  //int week;
  int day;
  int hour;
  int minute;
  int second;
  };
  struct rtc_struct set_time, rtc_time;

fd = open("/dev/ti_rts0", O_RDWR); if (fd < 0) { printf("can't open /dev/ti_rts0.\n"); return 0; }if(strcmp(argv[1], "w") == 0 && argc == 8) { set_time.year= atoi(argv[2]); set_time.month= atoi(argv[3]); set_time.day= atoi(argv[4]); set_time.hour= atoi(argv[5]); set_time.minute = atoi(argv[6]); set_time.second = atoi(argv[7]); write(fd, &set_time, sizeof(set_time)); printf("write ok\n"); } else if(strcmp(argv[1], "r") == 0) { if(argv[2] == NULL) i = 999; else i = atoi(argv[2]); do{ read(fd, &rtc_time, sizeof(rtc_time)); printf("\n\rcurrent_time is:\n\r\%d-%d-%d %d:%d:%d\n\r",\ rtc_time.year+2000,rtc_time.month,rtc_time.day,rtc_time.hour,rtc_time.minute,rtc_time.second); printf("read ok\n"); msleep(1000); i--; } while(i); }close(fd); return 0;

[1] = { .name= "RTCINT", .start = 107, .end= 107, .flags = IORESOURCE_IRQ,//107 }, [2] = { .name= "RTCALARMINT", .start = 108, .end= 108, .flags = IORESOURCE_IRQ,//108 },

unsigned int tmp; if (am437x_rtc_base == NULL) return; if (en) {/* Enable the clock/module so that we can access the registers */ pm_runtime_get_sync(&pdev->dev); //rtc init. tmp = readb(rtc_base + 0x40); //CTRL.Enable the RTC module writew(tmp & ~(0x01<<6), rtc_base + 0x40); writel(0x83E70B13, rtc_base + 0x6C); //KICK0R.Write Project Disable writel(0x95A4F1E0, rtc_base + 0x70); //KICK1Rtmp = readb(rtc_base + 0x54); //OSC.mode1:Internal clock writew(tmp & ~(0x01<<3), rtc_base + 0x54); tmp = readb(rtc_base + 0x54); writew(tmp | (0x01<<6), rtc_base + 0x54); tmp = readb(rtc_base + 0x40); //run. writew(tmp | (0x01<<0), rtc_base + 0x40); } else { tmp = readb(rtc_base + 0x40); //stop. writew(tmp & ~(0x01<<0), rtc_base + 0x40); tmp = readb(rtc_base + 0x40); //CTRL.Disable the RTC module writew(tmp | (0x01<<6), rtc_base + 0x40); /* Disable the clock/module */ pm_runtime_put_sync(&pdev->dev); }

int ret; printk(KERN_INFO"%s OK.\n",__func__); /* find the IRQs */ am437x_rtc_timer_irq = platform_get_irq(pdev, 0); if (am437x_rtc_timer_irq < 0) { dev_err(&pdev->dev, "no irq for rtc tick\n"); return am437x_rtc_timer_irq; }am437x_rtc_alarm_irq = platform_get_irq(pdev, 1); if (am437x_rtc_alarm_irq < 0) { dev_err(&pdev->dev, "no irq for alarm\n"); return am437x_rtc_alarm_irq; }dev_dbg(&pdev->dev, "am437x_rtc: tick irq %d, alarm irq %d\n", am437x_rtc_timer_irq, am437x_rtc_alarm_irq); /*RTC*/ res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if(res == NULL){ dev_err(&pdev->dev, "RTC:failed to get memory regin resource.\n"); return -ENOENT; }am437x_rtc_mem = request_mem_region(res->start, res->end - res->start+1, pdev->name); if (am437x_rtc_mem == NULL){ dev_err(&pdev->dev, "RTC:failed to reserve memory region.\n"); return -ENOENT; goto err_nores; }am437x_rtc_base = ioremap(res->start, res->end - res->start+1); if (am437x_rtc_mem == NULL){ dev_err(&pdev->dev, "RTC:failed ioremap.\n"); return -EINVAL; goto err_nomap; }am437x_rtc_enable(pdev, 1); rtc = devm_rtc_device_register(&pdev->dev, pdev->name,&am437x_rtc_ops, THIS_MODULE); if (IS_ERR(rtc)) { pr_debug("%s: can't register RTC device, err %ld\n",pdev->name, PTR_ERR(rtc)); goto err_nortc; }return 0;

printk(KERN_INFO"%s OK.\n",__func__);

tm->tm_sec= bin2bcd(tm->tm_sec); tm->tm_min= bin2bcd(tm->tm_min); tm->tm_hour = bin2bcd(tm->tm_hour); tm->tm_mday = bin2bcd(tm->tm_mday); tm->tm_mon= bin2bcd(tm->tm_mon + 1); /* epoch == 1900 */ if (tm->tm_year < 100 || tm->tm_year > 199) return -EINVAL; tm->tm_year = bin2bcd(tm->tm_year - 100); return 0;

/* BUSY may stay active for 1/32768 second (~30 usec) */ for (count = 0; count < 50; count++) { status = readb(am437x_rtc_base + 0x44); //STS if ((status & (0x01<<0)) == 0) break; udelay(1); } /* now we have ~15 usec to read/write various registers */

//local_irq_disable(); rtc_wait_not_busy(); rtc_t->tm_sec= readb(am437x_rtc_base + 0x00); rtc_t->tm_min= readb(am437x_rtc_base + 0x04); rtc_t->tm_hour = readb(am437x_rtc_base + 0x08); rtc_t->tm_mday = readb(am437x_rtc_base + 0x0C); rtc_t->tm_mon= readb(am437x_rtc_base + 0x10); rtc_t->tm_year = readb(am437x_rtc_base + 0x14); //local_irq_enable(); bcd2tm(rtc_t); printk("\n\rcurrent_time is:\n\r\%d-%d-%d %d:%d:%d\n\r",\ rtc_t->tm_year,rtc_t->tm_mon,rtc_t->tm_mday,rtc_t->tm_hour,rtc_t->tm_min,rtc_t->tm_sec); return 0;

//local_irq_disable(); rtc_wait_not_busy(); writeb(rtc_t->tm_sec, am437x_rtc_base + 0x00); writeb(rtc_t->tm_min, am437x_rtc_base + 0x04); writeb(rtc_t->tm_hour, am437x_rtc_base + 0x08); writeb(rtc_t->tm_mday, am437x_rtc_base + 0x0C); writeb(rtc_t->tm_mon, am437x_rtc_base + 0x10); writeb(rtc_t->tm_year, am437x_rtc_base + 0x14); //local_irq_enable(); return 0;

date

date 082316432017.00//2017-08-23 16:43:00

hwclock

hwclock -w

/sbin/hwclock -s

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