104 lines
2.1 KiB
C
104 lines
2.1 KiB
C
/*
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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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*/
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#include <common.h>
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#include <mach/mpc5xxx.h>
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#include <init.h>
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#include <asm/processor.h>
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#include <types.h>
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/* Bus-to-Core Multipliers */
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static int bus2core[] = {
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3, 2, 2, 2, 4, 4, 5, 9,
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6, 11, 8, 10, 3, 12, 7, 0,
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6, 5, 13, 2, 14, 4, 15, 9,
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0, 11, 8, 10, 16, 12, 7, 0
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};
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unsigned long get_bus_clock(void)
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{
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unsigned long 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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if (val & (1 << 5))
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return vco / 8;
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else
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return vco / 4;
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}
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unsigned long get_cpu_clock(void)
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{
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unsigned long val;
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val = *(vu_long *)MPC5XXX_CDM_PORCFG;
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return get_bus_clock() * bus2core[val & 0x1f] / 2;
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}
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unsigned long get_ipb_clock(void)
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{
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unsigned long val;
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val = *(vu_long *)MPC5XXX_CDM_CFG;
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if (val & (1 << 8))
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return get_bus_clock() / 2;
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else
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return get_bus_clock();
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}
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unsigned long get_pci_clock(void)
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{
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unsigned long val;
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val = *(vu_long *)MPC5XXX_CDM_CFG;
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switch (val & 3) {
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case 0:
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return get_ipb_clock();
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case 1:
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return get_ipb_clock() / 2;
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default:
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return get_bus_clock() / 4;
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}
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}
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unsigned long get_timebase_clock(void)
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{
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return (get_bus_clock() + 3L) / 4L;
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}
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int prt_mpc5xxx_clks (void)
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{
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printf(" Bus %ld MHz, IPB %ld MHz, PCI %ld MHz\n",
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get_bus_clock() / 1000000, get_ipb_clock() / 1000000,
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get_pci_clock() / 1000000);
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return 0;
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}
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late_initcall(prt_mpc5xxx_clks);
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