void rtc_reset (void)
{
rtc_write8(RTC_CONFIG_B, 0x82); /* disable the RTC to update the regs */
rtc_write8(RTC_CONFIG_A, 0x20); /* Normal OP */
rtc_write8(RTC_CONFIG_B, 0x00);
rtc_write8(RTC_CONFIG_B, 0x00);
rtc_write8(RTC_CONFIG_B, 0x02); /* enable the RTC to update the regs */
}
static int write_seeds_to_cmos(struct pei_data *pei_data)
{
u16 c1, c2, checksum;
struct udevice *dev;
int ret = 0;
ret = uclass_get_device(UCLASS_RTC, 0, &dev);
if (ret) {
debug("Cannot find RTC: err=%d\n", ret);
return -ENODEV;
}
/* Save the MRC seed values to CMOS */
rtc_write32(dev, CMOS_OFFSET_MRC_SEED, pei_data->scrambler_seed);
debug("Save scrambler seed 0x%08x to CMOS 0x%02x\n",
pei_data->scrambler_seed, CMOS_OFFSET_MRC_SEED);
rtc_write32(dev, CMOS_OFFSET_MRC_SEED_S3, pei_data->scrambler_seed_s3);
debug("Save s3 scrambler seed 0x%08x to CMOS 0x%02x\n",
pei_data->scrambler_seed_s3, CMOS_OFFSET_MRC_SEED_S3);
/* Save a simple checksum of the seed values */
c1 = compute_ip_checksum((u8 *)&pei_data->scrambler_seed,
sizeof(u32));
c2 = compute_ip_checksum((u8 *)&pei_data->scrambler_seed_s3,
sizeof(u32));
checksum = add_ip_checksums(sizeof(u32), c1, c2);
rtc_write8(dev, CMOS_OFFSET_MRC_SEED_CHK, checksum & 0xff);
rtc_write8(dev, CMOS_OFFSET_MRC_SEED_CHK + 1, (checksum >> 8) & 0xff);
return 0;
}
int rtc_set (struct rtc_time *tmp)
{
#ifdef RTC_DEBUG
printf ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
#endif
rtc_write8(RTC_CONFIG_B, 0x82); /* disable the RTC to update the regs */
rtc_write8(RTC_YEAR, bin2bcd(tmp->tm_year % 100));
rtc_write8(RTC_MONTH, bin2bcd(tmp->tm_mon));
rtc_write8(RTC_DAY_OF_WEEK, bin2bcd(tmp->tm_wday));
rtc_write8(RTC_DATE_OF_MONTH, bin2bcd(tmp->tm_mday));
rtc_write8(RTC_HOURS, bin2bcd(tmp->tm_hour));
rtc_write8(RTC_MINUTES, bin2bcd(tmp->tm_min));
rtc_write8(RTC_SECONDS, bin2bcd(tmp->tm_sec));
rtc_write8(RTC_CONFIG_B, 0x02); /* enable the RTC to update the regs */
return 0;
}
static void mc146818_init(void)
{
#if CLEAR_CMOS
int i;
rtc_write8(RTC_SECONDS_ALARM, 0);
rtc_write8(RTC_MINUTES_ALARM, 0);
rtc_write8(RTC_HOURS_ALARM, 0);
for (i = RTC_CONFIG_A; i < RTC_REG_SIZE; i++)
rtc_write8(i, 0);
printf("RTC: zeroing CMOS RAM\n");
#endif
/* Setup the real time clock */
mc146818_write8(RTC_CONFIG_B, RTC_CONFIG_B_24H);
/* Setup the frequency it operates at */
mc146818_write8(RTC_CONFIG_A, RTC_CONFIG_A_REF_CLCK_32KHZ |
RTC_CONFIG_A_RATE_1024HZ);
/* Ensure all reserved bits are 0 in register D */
mc146818_write8(RTC_CONFIG_D, RTC_CONFIG_D_VALID_RAM_AND_TIME);
/* Clear any pending interrupts */
mc146818_read8(RTC_CONFIG_C);
}