/* * (C) Copyright 2003 * Martin Winistoerfer, martinwinistoerfer@gmx.ch. * * See file CREDITS for list of people who contributed to this * project. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, */ /* * File: speed.c * * Discription: Provides cpu speed calculation * */ #include <common.h> #include <mpc5xx.h> #include <asm/processor.h> DECLARE_GLOBAL_DATA_PTR; /* * Get cpu and bus clock */ int get_clocks (void) { volatile immap_t *immr = (immap_t *) CFG_IMMR; #ifndef CONFIG_5xx_GCLK_FREQ uint divf = (immr->im_clkrst.car_plprcr & PLPRCR_DIVF_MSK); uint mf = ((immr->im_clkrst.car_plprcr & PLPRCR_MF_MSK) >> PLPRCR_MF_SHIFT); ulong vcoout; vcoout = (CFG_OSC_CLK / (divf + 1)) * (mf + 1) * 2; if(immr->im_clkrst.car_plprcr & PLPRCR_CSRC_MSK) { gd->cpu_clk = vcoout / (2^(((immr->im_clkrst.car_sccr & SCCR_DFNL_MSK) >> SCCR_DFNL_SHIFT) + 1)); } else { gd->cpu_clk = vcoout / (2^(immr->im_clkrst.car_sccr & SCCR_DFNH_MSK)); } #else /* CONFIG_5xx_GCLK_FREQ */ gd->bus_clk = CONFIG_5xx_GCLK_FREQ; #endif /* CONFIG_5xx_GCLK_FREQ */ if ((immr->im_clkrst.car_sccr & SCCR_EBDF11) == 0) { /* No Bus Divider active */ gd->bus_clk = gd->cpu_clk; } else { /* CLKOUT is GCLK / 2 */ gd->bus_clk = gd->cpu_clk / 2; } return (0); }