From 0db5bca8076998a7516102988ac976a2da28d531 Mon Sep 17 00:00:00 2001 From: wdenk Date: Mon, 31 Mar 2003 17:27:09 +0000 Subject: * Patch by Martin Winistoerfer, 23 Mar 2003 - Add port to MPC555/556 microcontrollers - Add support for cmi customer board with Intel 28F128J3A, 28F320J3A or 28F640J3A flash. * Patch by Rick Bronson, 28 Mar 2003: - fix common/cmd_nand.c --- cpu/mpc5xx/speed.c | 66 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 66 insertions(+) create mode 100644 cpu/mpc5xx/speed.c (limited to 'cpu/mpc5xx/speed.c') diff --git a/cpu/mpc5xx/speed.c b/cpu/mpc5xx/speed.c new file mode 100644 index 000000000..8098c9982 --- /dev/null +++ b/cpu/mpc5xx/speed.c @@ -0,0 +1,66 @@ +/* + * (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 +#include +#include + +/* + * Get cpu and bus clock + */ +int get_clocks (void) +{ + DECLARE_GLOBAL_DATA_PTR; + 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); +} -- cgit v1.2.3