diff options
Diffstat (limited to 'c/src/lib/libcpu/powerpc/ppc403/clock/clock.c')
| -rw-r--r-- | c/src/lib/libcpu/powerpc/ppc403/clock/clock.c | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/c/src/lib/libcpu/powerpc/ppc403/clock/clock.c b/c/src/lib/libcpu/powerpc/ppc403/clock/clock.c index 4a8f66d643..99b538dcd3 100644 --- a/c/src/lib/libcpu/powerpc/ppc403/clock/clock.c +++ b/c/src/lib/libcpu/powerpc/ppc403/clock/clock.c @@ -20,6 +20,12 @@ * * Derived from c/src/lib/libcpu/hppa1.1/clock/clock.c: * + * Modifications for deriving timer clock from cpu system clock by + * Thomas Doerfler <td@imd.m.isar.de> + * for these modifications: + * COPYRIGHT (c) 1997 by IMD, Puchheim, Germany. + * + * * COPYRIGHT (c) 1989-1998. * On-Line Applications Research Corporation (OAR). * Copyright assigned to U.S. Government, 1994. @@ -133,8 +139,14 @@ void Install_clock(rtems_isr_entry clock_isr) Clock_driver_ticks = 0; asm volatile ("mfdcr %0, 0xa0" : "=r" (iocr)); /* IOCR */ - iocr &= ~4; - iocr |= 4; /* Select external timer clock */ + + if (Cpu_table.timer_internal_clock) { + iocr &= ~4; /* timer clocked from system clock */ + } + else { + iocr |= 4; /* select external timer clock */ + } + asm volatile ("mtdcr 0xa0, %0" : "=r" (iocr) : "0" (iocr)); /* IOCR */ asm volatile ("mfspr %0, 0x11f" : "=r" ((pvr))); /* PVR */ @@ -143,7 +155,12 @@ void Install_clock(rtems_isr_entry clock_isr) return; /* Not a ppc403 */ if ((pvr & 0xff00) == 0x0000) /* 403GA */ +#if 0 /* FIXME: in which processor versions will "autoload" work properly? */ auto_restart = (pvr & 0x00f0) > 0x0000 ? 1 : 0; +#else + /* no known chip version supports auto restart of timer... */ + auto_restart = 0; +#endif else if ((pvr & 0xff00) == 0x0100) /* 403GB */ auto_restart = 1; |