diff options
Diffstat (limited to 'cpu/mpc8xx/speed.c')
| -rw-r--r-- | cpu/mpc8xx/speed.c | 35 |
1 files changed, 27 insertions, 8 deletions
diff --git a/cpu/mpc8xx/speed.c b/cpu/mpc8xx/speed.c index e1c3400..ae97d97 100644 --- a/cpu/mpc8xx/speed.c +++ b/cpu/mpc8xx/speed.c @@ -32,7 +32,6 @@ #define SPEED_PITC ((SPEED_PIT_COUNTS - 1) << PITC_SHIFT) #define SPEED_PITC_INIT ((SPEED_PIT_COUNTS + 1) << PITC_SHIFT) -#if !defined(CONFIG_8xx_GCLK_FREQ) /* Access functions for the Machine State Register */ static __inline__ unsigned long get_msr(void) { @@ -46,7 +45,6 @@ static __inline__ void set_msr(unsigned long msr) { asm volatile("mtmsr %0" : : "r" (msr)); } -#endif /* ------------------------------------------------------------------------- */ @@ -83,16 +81,20 @@ static __inline__ void set_msr(unsigned long msr) * CPU clock that is an even multiple of 0.1 MHz. */ -int get_clocks (void) +unsigned long measure_gclk(void) { - DECLARE_GLOBAL_DATA_PTR; - volatile immap_t *immr = (immap_t *) CFG_IMMR; -#ifndef CONFIG_8xx_GCLK_FREQ volatile cpmtimer8xx_t *timerp = &immr->im_cpmtimer; ulong timer2_val; ulong msr_val; +#ifdef CONFIG_MPC866_et_al + /* dont use OSCM, only use EXTCLK/512 */ + immr->im_clkrst.car_sccr |= SCCR_RTSEL | SCCR_RTDIV; +#else + immr->im_clkrst.car_sccr &= ~(SCCR_RTSEL | SCCR_RTDIV); +#endif + /* Reset + Stop Timer 2, no cascading */ timerp->cpmt_tgcr &= ~(TGCR_CAS2 | TGCR_RST2); @@ -158,10 +160,27 @@ int get_clocks (void) timerp->cpmt_tgcr &= ~(TGCR_RST2 | TGCR_FRZ2 | TGCR_STP2); immr->im_sit.sit_piscr &= ~PISCR_PTE; - gd->cpu_clk = ((timer2_val + 2) / 4) * 100000L; /* convert to Hz */ +#ifdef CONFIG_MPC866_et_al + /* not using OSCM, using XIN, so scale appropriately */ + return (((timer2_val + 2) / 4) * (CFG_8XX_XIN/512))/8192 * 100000L; +#else + return ((timer2_val + 2) / 4) * 100000L; /* convert to Hz */ +#endif +} + +/* + * get_clocks() fills in gd->cpu_clock depending on CONFIG_8xx_GCLK_FREQ + * or (if it is not defined) measure_gclk() (which uses the ref clock) + * from above. + */ +int get_clocks (void) +{ + DECLARE_GLOBAL_DATA_PTR; + volatile immap_t *immr = (immap_t *) CFG_IMMR; +#ifndef CONFIG_8xx_GCLK_FREQ + gd->cpu_clk = measure_gclk(); #else /* CONFIG_8xx_GCLK_FREQ */ - /* * If for some reason measuring the gclk frequency won't * work, we return the hardwired value. |