1/* 2 * (C) Copyright 2000-2002 3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. 4 * 5 * See file CREDITS for list of people who contributed to this 6 * project. 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License as 10 * published by the Free Software Foundation; either version 2 of 11 * the License, or (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 21 * MA 02111-1307 USA 22 */ 23 24#include <common.h> 25#include <74xx_7xx.h> 26#include <asm/processor.h> 27 28DECLARE_GLOBAL_DATA_PTR; 29 30extern unsigned long get_board_bus_clk (void); 31 32static const int hid1_multipliers_x_10[] = { 33 25, /* 0000 - 2.5x */ 34 75, /* 0001 - 7.5x */ 35 70, /* 0010 - 7x */ 36 10, /* 0011 - bypass */ 37 20, /* 0100 - 2x */ 38 65, /* 0101 - 6.5x */ 39 100, /* 0110 - 10x */ 40 45, /* 0111 - 4.5x */ 41 30, /* 1000 - 3x */ 42 55, /* 1001 - 5.5x */ 43 40, /* 1010 - 4x */ 44 50, /* 1011 - 5x */ 45 80, /* 1100 - 8x */ 46 60, /* 1101 - 6x */ 47 35, /* 1110 - 3.5x */ 48 0 /* 1111 - off */ 49}; 50 51/* PLL_CFG[0:4] table for cpu 7448/7447A/7455/7457 */ 52static const int hid1_74xx_multipliers_x_10[] = { 53 115, /* 00000 - 11.5x */ 54 170, /* 00001 - 17x */ 55 75, /* 00010 - 7.5x */ 56 150, /* 00011 - 15x */ 57 70, /* 00100 - 7x */ 58 180, /* 00101 - 18x */ 59 10, /* 00110 - bypass */ 60 200, /* 00111 - 20x */ 61 20, /* 01000 - 2x */ 62 210, /* 01001 - 21x */ 63 65, /* 01010 - 6.5x */ 64 130, /* 01011 - 13x */ 65 85, /* 01100 - 8.5x */ 66 240, /* 01101 - 24x */ 67 95, /* 01110 - 9.5x */ 68 90, /* 01111 - 9x */ 69 30, /* 10000 - 3x */ 70 105, /* 10001 - 10.5x */ 71 55, /* 10010 - 5.5x */ 72 110, /* 10011 - 11x */ 73 40, /* 10100 - 4x */ 74 100, /* 10101 - 10x */ 75 50, /* 10110 - 5x */ 76 120, /* 10111 - 12x */ 77 80, /* 11000 - 8x */ 78 140, /* 11001 - 14x */ 79 60, /* 11010 - 6x */ 80 160, /* 11011 - 16x */ 81 135, /* 11100 - 13.5x */ 82 280, /* 11101 - 28x */ 83 0, /* 11110 - off */ 84 125 /* 11111 - 12.5x */ 85}; 86 87static const int hid1_fx_multipliers_x_10[] = { 88 00, /* 0000 - off */ 89 00, /* 0001 - off */ 90 10, /* 0010 - bypass */ 91 10, /* 0011 - bypass */ 92 20, /* 0100 - 2x */ 93 25, /* 0101 - 2.5x */ 94 30, /* 0110 - 3x */ 95 35, /* 0111 - 3.5x */ 96 40, /* 1000 - 4x */ 97 45, /* 1001 - 4.5x */ 98 50, /* 1010 - 5x */ 99 55, /* 1011 - 5.5x */ 100 60, /* 1100 - 6x */ 101 65, /* 1101 - 6.5x */ 102 70, /* 1110 - 7x */ 103 75, /* 1111 - 7.5 */ 104 80, /* 10000 - 8x */ 105 85, /* 10001 - 8.5x */ 106 90, /* 10010 - 9x */ 107 95, /* 10011 - 9.5x */ 108 100, /* 10100 - 10x */ 109 110, /* 10101 - 11x */ 110 120, /* 10110 - 12x */ 111}; 112 113 114/* ------------------------------------------------------------------------- */ 115 116/* 117 * Measure CPU clock speed (core clock GCLK1, GCLK2) 118 * 119 * (Approx. GCLK frequency in Hz) 120 */ 121 122int get_clocks (void) 123{ 124 ulong clock = 0; 125 126#ifdef CONFIG_SYS_BUS_CLK 127 gd->bus_clk = CONFIG_SYS_BUS_CLK; /* bus clock is a fixed frequency */ 128#else 129 gd->bus_clk = get_board_bus_clk (); /* bus clock is configurable */ 130#endif 131 132 /* calculate the clock frequency based upon the CPU type */ 133 switch (get_cpu_type()) { 134 case CPU_7447A: 135 case CPU_7448: 136 case CPU_7455: 137 case CPU_7457: 138 /* 139 * Make sure division is done before multiplication to prevent 32-bit 140 * arithmetic overflows which will cause a negative number 141 */ 142 clock = (gd->bus_clk / 10) * 143 hid1_74xx_multipliers_x_10[(get_hid1 () >> 12) & 0x1F]; 144 break; 145 146 case CPU_750GX: 147 case CPU_750FX: 148 clock = (gd->bus_clk / 10) * 149 hid1_fx_multipliers_x_10[get_hid1 () >> 27]; 150 break; 151 152 case CPU_7450: 153 case CPU_740: 154 case CPU_740P: 155 case CPU_745: 156 case CPU_750CX: 157 case CPU_750: 158 case CPU_750P: 159 case CPU_755: 160 case CPU_7400: 161 case CPU_7410: 162 /* 163 * Make sure division is done before multiplication to prevent 32-bit 164 * arithmetic overflows which will cause a negative number 165 */ 166 clock = (gd->bus_clk / 10) * 167 hid1_multipliers_x_10[get_hid1 () >> 28]; 168 break; 169 170 case CPU_UNKNOWN: 171 printf ("get_gclk_freq(): unknown CPU type\n"); 172 clock = 0; 173 return (1); 174 } 175 176 gd->cpu_clk = clock; 177 178 return (0); 179} 180 181/* ------------------------------------------------------------------------- */ 182