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Give some output about the CPU clock on IBMPOWER machines, currently read

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from OF. Linux does it similar, means they also read the OF values and
display them.

Tested under qemu and real hardware:

	cpu0: IBM POWER5+ revision 2.0, 1898.10 MHz
This commit is contained in:
Andreas Tobler 2013-11-28 21:57:17 +00:00
parent be3d0087dc
commit a07c08cea5
1 changed files with 41 additions and 0 deletions
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41
sys/powerpc/powerpc/cpu.c
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@ -74,6 +74,8 @@
#include <machine/smp.h>
#include <machine/spr.h>
#include <dev/ofw/openfirm.h>
static void cpu_6xx_setup(int cpuid, uint16_t vers);
static void cpu_970_setup(int cpuid, uint16_t vers);
static void cpu_booke_setup(int cpuid, uint16_t vers);
@ -273,6 +275,10 @@ cpu_est_clockrate(int cpu_id, uint64_t *cps)
{
uint16_t vers;
register_t msr;
phandle_t cpu, dev, root;
uint32_t freq[2];
int res = 0;
char buf[8];
vers = mfpvr() >> 16;
msr = mfmsr();
@ -316,6 +322,41 @@ cpu_est_clockrate(int cpu_id, uint64_t *cps)
mtmsr(msr);
return (0);
case IBMPOWER5:
case IBMPOWER5PLUS:
case IBMPOWER6:
case IBMPOWER7:
case IBMPOWER7PLUS:
case IBMPOWER8:
root = OF_peer(0);
dev = OF_child(root);
while (dev != 0) {
res = OF_getprop(dev, "name", buf, sizeof(buf));
if (res > 0 && strcmp(buf, "cpus") == 0)
break;
dev = OF_peer(dev);
}
cpu = OF_child(dev);
while (cpu != 0) {
res = OF_getprop(cpu, "device_type", buf,
sizeof(buf));
if (res > 0 && strcmp(buf, "cpu") == 0)
break;
cpu = OF_peer(cpu);
}
if (cpu == 0)
return (ENOENT);
if (OF_getprop(cpu, "clock-frequency", &freq[0],
sizeof(freq[0])))
*cps = freq[0];
else if (OF_getprop(cpu, "ibm,extended-clock-frequency",
&freq, sizeof(freq)))
*cps = freq[1];
else
*cps = 0;
return(0);
}
return (ENXIO);