/* * (C) Copyright 2000-2002 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. * * 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, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA */ #include <common.h> #include <74xx_7xx.h> #include <asm/processor.h> #ifdef CONFIG_AMIGAONEG3SE #include "../board/MAI/AmigaOneG3SE/via686.h" #endif static const int hid1_multipliers_x_10[] = { 25, /* 0000 - 2.5x */ 75, /* 0001 - 7.5x */ 70, /* 0010 - 7x */ 10, /* 0011 - bypass */ 20, /* 0100 - 2x */ 65, /* 0101 - 6.5x */ 100, /* 0110 - 10x */ 45, /* 0111 - 4.5x */ 30, /* 1000 - 3x */ 55, /* 1001 - 5.5x */ 40, /* 1010 - 4x */ 50, /* 1011 - 5x */ 80, /* 1100 - 8x */ 60, /* 1101 - 6x */ 35, /* 1110 - 3.5x */ 0 /* 1111 - off */ }; static const int hid1_fx_multipliers_x_10[] = { 00, /* 0000 - off */ 00, /* 0001 - off */ 10, /* 0010 - bypass */ 10, /* 0011 - bypass */ 20, /* 0100 - 2x */ 25, /* 0101 - 2.5x */ 30, /* 0110 - 3x */ 35, /* 0111 - 3.5x */ 40, /* 1000 - 4x */ 45, /* 1001 - 4.5x */ 50, /* 1010 - 5x */ 55, /* 1011 - 5.5x */ 60, /* 1100 - 6x */ 65, /* 1101 - 6.5x */ 70, /* 1110 - 7x */ 75, /* 1111 - 7.5 */ 80, /* 10000 - 8x */ 85, /* 10001 - 8.5x */ 90, /* 10010 - 9x */ 95, /* 10011 - 9.5x */ 100, /* 10100 - 10x */ 110, /* 10101 - 11x */ 120, /* 10110 - 12x */ }; /* ------------------------------------------------------------------------- */ /* * Measure CPU clock speed (core clock GCLK1, GCLK2) * * (Approx. GCLK frequency in Hz) */ int get_clocks (void) { DECLARE_GLOBAL_DATA_PTR; ulong clock = 0; /* calculate the clock frequency based upon the CPU type */ switch (get_cpu_type()) { case CPU_7455: case CPU_7457: /* * It is assumed that the PLL_EXT line is zero. * Make sure division is done before multiplication to prevent 32-bit * arithmetic overflows which will cause a negative number */ clock = (CFG_BUS_CLK / 10) * hid1_multipliers_x_10[(get_hid1 () >> 13) & 0xF]; break; case CPU_750GX: case CPU_750FX: clock = CFG_BUS_CLK * hid1_fx_multipliers_x_10[get_hid1 () >> 27] / 10; break; case CPU_7450: case CPU_740: case CPU_740P: case CPU_745: case CPU_750CX: case CPU_750: case CPU_750P: case CPU_755: case CPU_7400: case CPU_7410: /* * Make sure division is done before multiplication to prevent 32-bit * arithmetic overflows which will cause a negative number */ clock = (CFG_BUS_CLK / 10) * hid1_multipliers_x_10[get_hid1 () >> 28]; break; case CPU_UNKNOWN: printf ("get_gclk_freq(): unknown CPU type\n"); clock = 0; return (1); } gd->cpu_clk = clock; gd->bus_clk = CFG_BUS_CLK; return (0); } /* ------------------------------------------------------------------------- */