Author: jhibbits
Date: Sat Apr 1 22:29:11 2017
New Revision: 316378
URL: https://svnweb.freebsd.org/changeset/base/316378
Log:
Add a helper function to get system reference clock
Many devices are clocked from the SoC's platform clock / 2. Some device nodes
include their own clock-frequency property, while others are dependent on the
SoC's bus-frequency property instead. To simplify, add a helper function to
get
this clock.
Modified:
head/sys/powerpc/mpc85xx/mpc85xx.c
head/sys/powerpc/mpc85xx/mpc85xx.h
Modified: head/sys/powerpc/mpc85xx/mpc85xx.c
==============================================================================
--- head/sys/powerpc/mpc85xx/mpc85xx.c Sat Apr 1 22:03:00 2017
(r316377)
+++ head/sys/powerpc/mpc85xx/mpc85xx.c Sat Apr 1 22:29:11 2017
(r316378)
@@ -436,3 +436,18 @@ mpc85xx_fix_errata(vm_offset_t va_ccsr)
err:
return;
}
+
+uint32_t
+mpc85xx_get_system_clock(void)
+{
+ phandle_t soc;
+ uint32_t freq;
+
+ soc = OF_finddevice("/soc");
+ freq = 0;
+
+ /* freq isn't modified on error. */
+ OF_getencprop(soc, "bus-frequency", (void *)&freq, sizeof(freq));
+
+ return (freq / 2);
+}
Modified: head/sys/powerpc/mpc85xx/mpc85xx.h
==============================================================================
--- head/sys/powerpc/mpc85xx/mpc85xx.h Sat Apr 1 22:03:00 2017
(r316377)
+++ head/sys/powerpc/mpc85xx/mpc85xx.h Sat Apr 1 22:29:11 2017
(r316378)
@@ -171,5 +171,6 @@ void mpc85xx_enable_l3_cache(void);
void mpc85xx_fix_errata(vm_offset_t);
void dataloss_erratum_access(vm_offset_t, uint32_t);
int mpc85xx_is_qoriq(void);
+uint32_t mpc85xx_get_system_clock(void);
#endif /* _MPC85XX_H_ */
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