1 /* 2 * Copyright 2004 Freescale Semiconductor. 3 * Jeff Brown 4 * Srikanth Srinivasan (srikanth.srinivasan@freescale.com) 5 * 6 * (C) Copyright 2000-2002 7 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. 8 * 9 * See file CREDITS for list of people who contributed to this 10 * project. 11 * 12 * This program is free software; you can redistribute it and/or 13 * modify it under the terms of the GNU General Public License as 14 * published by the Free Software Foundation; either version 2 of 15 * the License, or (at your option) any later version. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; if not, write to the Free Software 24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 25 * MA 02111-1307 USA 26 */ 27 28 #include <common.h> 29 #include <mpc86xx.h> 30 #include <asm/processor.h> 31 #include <asm/io.h> 32 33 DECLARE_GLOBAL_DATA_PTR; 34 35 /* used in some defintiions of CONFIG_SYS_CLK_FREQ */ 36 extern unsigned long get_board_sys_clk(unsigned long dummy); 37 38 void get_sys_info(sys_info_t *sysInfo) 39 { 40 volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR; 41 volatile ccsr_gur_t *gur = &immap->im_gur; 42 uint plat_ratio, e600_ratio; 43 uint lcrr_div; 44 45 plat_ratio = (gur->porpllsr) & 0x0000003e; 46 plat_ratio >>= 1; 47 48 switch (plat_ratio) { 49 case 0x0: 50 sysInfo->freqSystemBus = 16 * CONFIG_SYS_CLK_FREQ; 51 break; 52 case 0x02: 53 case 0x03: 54 case 0x04: 55 case 0x05: 56 case 0x06: 57 case 0x08: 58 case 0x09: 59 case 0x0a: 60 case 0x0c: 61 case 0x10: 62 sysInfo->freqSystemBus = plat_ratio * CONFIG_SYS_CLK_FREQ; 63 break; 64 default: 65 sysInfo->freqSystemBus = 0; 66 break; 67 } 68 69 e600_ratio = (gur->porpllsr) & 0x003f0000; 70 e600_ratio >>= 16; 71 72 switch (e600_ratio) { 73 case 0x10: 74 sysInfo->freqProcessor = 2 * sysInfo->freqSystemBus; 75 break; 76 case 0x19: 77 sysInfo->freqProcessor = 5 * sysInfo->freqSystemBus / 2; 78 break; 79 case 0x20: 80 sysInfo->freqProcessor = 3 * sysInfo->freqSystemBus; 81 break; 82 case 0x39: 83 sysInfo->freqProcessor = 7 * sysInfo->freqSystemBus / 2; 84 break; 85 case 0x28: 86 sysInfo->freqProcessor = 4 * sysInfo->freqSystemBus; 87 break; 88 case 0x1d: 89 sysInfo->freqProcessor = 9 * sysInfo->freqSystemBus / 2; 90 break; 91 default: 92 sysInfo->freqProcessor = e600_ratio + sysInfo->freqSystemBus; 93 break; 94 } 95 96 #if defined(CONFIG_SYS_LBC_LCRR) 97 /* We will program LCRR to this value later */ 98 lcrr_div = CONFIG_SYS_LBC_LCRR & LCRR_CLKDIV; 99 #else 100 lcrr_div = in_be32(&immap->im_lbc.lcrr) & LCRR_CLKDIV; 101 #endif 102 if (lcrr_div == 2 || lcrr_div == 4 || lcrr_div == 8) { 103 sysInfo->freqLocalBus = sysInfo->freqSystemBus / (lcrr_div * 2); 104 } else { 105 /* In case anyone cares what the unknown value is */ 106 sysInfo->freqLocalBus = lcrr_div; 107 } 108 } 109 110 111 /* 112 * Measure CPU clock speed (core clock GCLK1, GCLK2) 113 * (Approx. GCLK frequency in Hz) 114 */ 115 116 int get_clocks(void) 117 { 118 sys_info_t sys_info; 119 120 get_sys_info(&sys_info); 121 gd->cpu_clk = sys_info.freqProcessor; 122 gd->bus_clk = sys_info.freqSystemBus; 123 gd->arch.lbc_clk = sys_info.freqLocalBus; 124 125 /* 126 * The base clock for I2C depends on the actual SOC. Unfortunately, 127 * there is no pattern that can be used to determine the frequency, so 128 * the only choice is to look up the actual SOC number and use the value 129 * for that SOC. This information is taken from application note 130 * AN2919. 131 */ 132 #ifdef CONFIG_MPC8610 133 gd->arch.i2c1_clk = sys_info.freqSystemBus; 134 #else 135 gd->arch.i2c1_clk = sys_info.freqSystemBus / 2; 136 #endif 137 gd->arch.i2c2_clk = gd->arch.i2c1_clk; 138 139 if (gd->cpu_clk != 0) 140 return 0; 141 else 142 return 1; 143 } 144 145 146 /* 147 * get_bus_freq 148 * Return system bus freq in Hz 149 */ 150 151 ulong get_bus_freq(ulong dummy) 152 { 153 ulong val; 154 sys_info_t sys_info; 155 156 get_sys_info(&sys_info); 157 val = sys_info.freqSystemBus; 158 159 return val; 160 } 161