138 lines
3.4 KiB
C
138 lines
3.4 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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* 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 <74xx_7xx.h>
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#include <asm/processor.h>
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#ifdef CONFIG_AMIGAONEG3SE
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#include "../board/MAI/AmigaOneG3SE/via686.h"
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#endif
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static const int hid1_multipliers_x_10[] = {
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25, /* 0000 - 2.5x */
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75, /* 0001 - 7.5x */
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70, /* 0010 - 7x */
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10, /* 0011 - bypass */
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20, /* 0100 - 2x */
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65, /* 0101 - 6.5x */
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100, /* 0110 - 10x */
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45, /* 0111 - 4.5x */
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30, /* 1000 - 3x */
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55, /* 1001 - 5.5x */
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40, /* 1010 - 4x */
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50, /* 1011 - 5x */
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80, /* 1100 - 8x */
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60, /* 1101 - 6x */
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35, /* 1110 - 3.5x */
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0 /* 1111 - off */
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};
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static const int hid1_fx_multipliers_x_10[] = {
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00, /* 0000 - off */
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00, /* 0001 - off */
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10, /* 0010 - bypass */
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10, /* 0011 - bypass */
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20, /* 0100 - 2x */
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25, /* 0101 - 2.5x */
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30, /* 0110 - 3x */
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35, /* 0111 - 3.5x */
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40, /* 1000 - 4x */
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45, /* 1001 - 4.5x */
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50, /* 1010 - 5x */
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55, /* 1011 - 5.5x */
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60, /* 1100 - 6x */
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65, /* 1101 - 6.5x */
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70, /* 1110 - 7x */
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75, /* 1111 - 7.5 */
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80, /* 10000 - 8x */
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85, /* 10001 - 8.5x */
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90, /* 10010 - 9x */
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95, /* 10011 - 9.5x */
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100, /* 10100 - 10x */
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110, /* 10101 - 11x */
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120, /* 10110 - 12x */
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};
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/* ------------------------------------------------------------------------- */
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/*
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* Measure CPU clock speed (core clock GCLK1, GCLK2)
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*
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* (Approx. GCLK frequency in Hz)
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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 clock = 0;
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/* calculate the clock frequency based upon the CPU type */
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switch (get_cpu_type()) {
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case CPU_7455:
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case CPU_7457:
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/*
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* It is assumed that the PLL_EXT line is zero.
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* Make sure division is done before multiplication to prevent 32-bit
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* arithmetic overflows which will cause a negative number
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*/
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clock = (CFG_BUS_CLK / 10) * hid1_multipliers_x_10[(get_hid1 () >> 13) & 0xF];
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break;
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case CPU_750GX:
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case CPU_750FX:
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clock = CFG_BUS_CLK * hid1_fx_multipliers_x_10[get_hid1 () >> 27] / 10;
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break;
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case CPU_7450:
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case CPU_740:
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case CPU_740P:
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case CPU_745:
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case CPU_750CX:
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case CPU_750:
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case CPU_750P:
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case CPU_755:
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case CPU_7400:
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case CPU_7410:
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/*
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* Make sure division is done before multiplication to prevent 32-bit
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* arithmetic overflows which will cause a negative number
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*/
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clock = (CFG_BUS_CLK / 10) * hid1_multipliers_x_10[get_hid1 () >> 28];
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break;
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case CPU_UNKNOWN:
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printf ("get_gclk_freq(): unknown CPU type\n");
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clock = 0;
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return (1);
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}
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gd->cpu_clk = clock;
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gd->bus_clk = CFG_BUS_CLK;
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return (0);
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}
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/* ------------------------------------------------------------------------- */
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