mirror of
https://github.com/AsahiLinux/u-boot
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94 lines
2.3 KiB
C
94 lines
2.3 KiB
C
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/*
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* (C) Copyright 2000-2002
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <mpc5xxx.h>
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#include <asm/processor.h>
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/* ------------------------------------------------------------------------- */
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/* Bus-to-Core Multipliers */
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static int bus2core[] = {
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0, 0, 0, 10, 20, 20, 25, 45,
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30, 55, 40, 50, 0, 60, 35, 0,
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30, 25, 65, 10, 70, 20, 75, 45,
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0, 55, 40, 50, 80, 60, 35, 0
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};
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/* ------------------------------------------------------------------------- */
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/*
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*
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*/
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int get_clocks (void)
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{
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DECLARE_GLOBAL_DATA_PTR;
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ulong val, vco;
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#if !defined(CFG_MPC5XXX_CLKIN)
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#error clock measuring not implemented yet - define CFG_MPC5XXX_CLKIN
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#endif
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val = *(vu_long *)MPC5XXX_CDM_PORCFG;
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if (val & (1 << 6)) {
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vco = CFG_MPC5XXX_CLKIN * 12;
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} else {
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vco = CFG_MPC5XXX_CLKIN * 16;
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}
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if (val & (1 << 5)) {
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gd->bus_clk = vco / 8;
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} else {
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gd->bus_clk = vco / 4;
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}
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gd->cpu_clk = gd->bus_clk * bus2core[val & 0x1f] / 10;
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val = *(vu_long *)MPC5XXX_CDM_CFG;
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if (val & (1 << 8)) {
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gd->ipb_clk = gd->bus_clk / 2;
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} else {
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gd->ipb_clk = gd->bus_clk;
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}
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switch (val & 3) {
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case 0: gd->pci_clk = gd->ipb_clk; break;
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case 1: gd->pci_clk = gd->ipb_clk / 2; break;
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default: gd->pci_clk = gd->bus_clk / 4; break;
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}
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return (0);
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}
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int prt_mpc5xxx_clks (void)
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{
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DECLARE_GLOBAL_DATA_PTR;
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printf(" Bus %ld MHz, IPB %ld MHz, PCI %ld MHz\n",
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gd->bus_clk / 1000000, gd->ipb_clk / 1000000,
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gd->pci_clk / 1000000);
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return (0);
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}
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/* ------------------------------------------------------------------------- */
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