upstream/opnsense-src
1
0
Fork 0
mirror of https://github.com/opnsense/src.git synced 2026-05-28 04:12:45 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

MFC r208152,208172:

Browse source 
On PowerMac11,2 and (presumably) PowerMac12,1, we need to quiesce the
firmware in order to take over control of the SMU. Without doing this,
the firmware background process doing fan control will run amok as we
take over the system and crash the management chip.

This is limited to these two machines because our kernel is heavily
dependent on firmware accesses, and so quiescing firmware can cause
nasty problems.
This commit is contained in:
Nathan Whitehorn 2010-05-23 02:18:40 +00:00
parent e48c5269bc
commit 7fe63926ae
1 changed files with 40 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

40
sys/powerpc/aim/ofw_machdep.c
View file

@ -75,6 +75,7 @@ static int (*ofwcall)(void *);
static void *fdt;
int ofw_real_mode;
static void ofw_quiesce(void);
static int openfirmware(void *args);
/*
@ -291,6 +292,12 @@ OF_bootstrap()
return status;
OF_init(openfirmware);
/*
* On some machines, we need to quiesce OF to turn off
* background processes.
*/
ofw_quiesce();
} else {
status = OF_install(OFW_FDT, 0);
@ -303,6 +310,39 @@ OF_bootstrap()
return (status);
}
static void
ofw_quiesce(void)
{
phandle_t rootnode;
char model[32];
struct {
cell_t name;
cell_t nargs;
cell_t nreturns;
} args;
/*
* Only quiesce Open Firmware on PowerMac11,2 and 12,1. It is
* necessary there to shut down a background thread doing fan
* management, and is harmful on other machines.
*
* Note: we don't need to worry about which OF module we are
* using since this is called only from very early boot, within
* OF's boot context.
*/
rootnode = OF_finddevice("/");
if (OF_getprop(rootnode, "model", model, sizeof(model)) > 0) {
if (strcmp(model, "PowerMac11,2") == 0 ||
strcmp(model, "PowerMac12,1") == 0) {
args.name = (cell_t)(uintptr_t)"quiesce";
args.nargs = 0;
args.nreturns = 0;
openfirmware(&args);
}
}
}
static int
openfirmware(void *args)
{