d/freebsd-skq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

[PowerPC] Fix setting of time in OPAL

Browse Source 
There were multiple bugs in the OPAL RTC code which had never been
discovered, as the default configuration of OPAL machines is to
have the BMC / FSP control the RTC.

* Fix calling convention for setting the time -- the variables are passed
directly in CPU registers, not via memory.

* Fix bug in the bcd encoding routines. (from jhibbits)

Tested on POWER9 Talos II (BE) and POWER9 Blackbird (LE).

Reviewed by:	jhibbits (in irc)
Sponsored by:	Tag1 Consulting, Inc.
This commit is contained in:
Brandon Bergren 2020-09-10 01:49:53 +00:00
parent 6034024dad
commit 5c74d551d2
1 changed files with 9 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
sys/powerpc/powernv/opal_dev.c
View File

@ -256,15 +256,15 @@ bin2bcd32(int bin)
int tmp;
tmp = bin % 100;
out += bin2bcd(tmp) * 1;
out += bin2bcd(tmp) * 0x1;
bin = bin / 100;
tmp = bin % 100;
out += bin2bcd(tmp) * 100;
out += bin2bcd(tmp) * 0x100;
bin = bin / 100;
tmp = bin % 100;
out += bin2bcd(tmp) * 10000;
out += bin2bcd(tmp) * 0x10000;
return (out);
}
@ -297,7 +297,7 @@ opal_gettime(device_t dev, struct timespec *ts)
ct.day = bcd2bin((ymd & 0x000000ff) >> 0);
ct.mon = bcd2bin((ymd & 0x0000ff00) >> 8);
ct.year = bcd2bin32((ymd & 0xffff0000) >> 16);
ct.year = bcd2bin32((ymd & 0xffff0000) >> 16);
return (clock_ct_to_ts(&ct, ts));
}
@ -321,11 +321,12 @@ opal_settime(device_t dev, struct timespec *ts)
hmsm |= ((uint64_t)bin2bcd(ct.min) << 48);
hmsm |= ((uint64_t)bin2bcd(ct.hour) << 56);
hmsm = htobe64(hmsm);
ymd = htobe32(ymd);
/*
* We do NOT swap endian here, because the values are being sent
* via registers instead of indirect via memory.
*/
do {
rv = opal_call(OPAL_RTC_WRITE, vtophys(&ymd), vtophys(&hmsm));
rv = opal_call(OPAL_RTC_WRITE, ymd, hmsm);
if (rv == OPAL_BUSY_EVENT) {
rv = opal_call(OPAL_POLL_EVENTS, 0);
pause("opalrtc", 1);