diff options
| author | wdenk <wdenk> | 2004-04-24 23:23:30 +0000 |
|---|---|---|
| committer | wdenk <wdenk> | 2004-04-24 23:23:30 +0000 |
| commit | e9132ea94c0182400895423c21bb04fa81f0b3f4 (patch) | |
| tree | f6b5dcb9afdc85d0ef74a4fe3cda6df0dd9c267c /cpu/mpc8xx | |
| parent | 5cf91d6bdc3e60bd43f9ba1bbb97a43ee49b2b2d (diff) | |
Clean up the TQM8xx_YYMHz configurations; allow to use the same
binary image for all clock frequencies. Implement run-time
optimization of flash access timing based on the actual bus
frequency.
Diffstat (limited to 'cpu/mpc8xx')
| -rw-r--r-- | cpu/mpc8xx/speed.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/cpu/mpc8xx/speed.c b/cpu/mpc8xx/speed.c index aebfbcb1d77..165705cea9d 100644 --- a/cpu/mpc8xx/speed.c +++ b/cpu/mpc8xx/speed.c @@ -347,4 +347,32 @@ static long init_pll_866 (long clk) #endif /* CONFIG_MPC866_et_al */ +#if defined(CONFIG_TQM8xxL) && !defined(CONFIG_TQM866M) +/* + * Adjust sdram refresh rate to actual CPU clock + * and set timebase source according to actual CPU clock + */ +int adjust_sdram_tbs_8xx (void) +{ + DECLARE_GLOBAL_DATA_PTR; + + volatile immap_t *immr = (immap_t *) CFG_IMMR; + long mamr; + long sccr; + + mamr = immr->im_memctl.memc_mamr; + mamr &= ~MAMR_PTA_MSK; + mamr |= ((gd->cpu_clk / CFG_PTA_PER_CLK) << MAMR_PTA_SHIFT); + immr->im_memctl.memc_mamr = mamr; + + if (gd->cpu_clk < 67000000) { + sccr = immr->im_clkrst.car_sccr; + sccr |= SCCR_TBS; + immr->im_clkrst.car_sccr = sccr; + } + + return (0); +} +#endif /* CONFIG_TQM8xxL/M, !TQM866M */ + /* ------------------------------------------------------------------------- */ |