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 * SPDX-License-Identifier: GPL-2.0+ 10 */ 11 12 #include <common.h> 13 #include <mpc86xx.h> 14 #include <asm/processor.h> 15 #include <asm/io.h> 16 17 DECLARE_GLOBAL_DATA_PTR; 18 19 /* used in some defintiions of CONFIG_SYS_CLK_FREQ */ 20 extern unsigned long get_board_sys_clk(unsigned long dummy); 21 22 void get_sys_info(sys_info_t *sysInfo) 23 { 24 volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR; 25 volatile ccsr_gur_t *gur = &immap->im_gur; 26 uint plat_ratio, e600_ratio; 27 uint lcrr_div; 28 29 plat_ratio = (gur->porpllsr) & 0x0000003e; 30 plat_ratio >>= 1; 31 32 switch (plat_ratio) { 33 case 0x0: 34 sysInfo->freqSystemBus = 16 * CONFIG_SYS_CLK_FREQ; 35 break; 36 case 0x02: 37 case 0x03: 38 case 0x04: 39 case 0x05: 40 case 0x06: 41 case 0x08: 42 case 0x09: 43 case 0x0a: 44 case 0x0c: 45 case 0x10: 46 sysInfo->freqSystemBus = plat_ratio * CONFIG_SYS_CLK_FREQ; 47 break; 48 default: 49 sysInfo->freqSystemBus = 0; 50 break; 51 } 52 53 e600_ratio = (gur->porpllsr) & 0x003f0000; 54 e600_ratio >>= 16; 55 56 switch (e600_ratio) { 57 case 0x10: 58 sysInfo->freqProcessor = 2 * sysInfo->freqSystemBus; 59 break; 60 case 0x19: 61 sysInfo->freqProcessor = 5 * sysInfo->freqSystemBus / 2; 62 break; 63 case 0x20: 64 sysInfo->freqProcessor = 3 * sysInfo->freqSystemBus; 65 break; 66 case 0x39: 67 sysInfo->freqProcessor = 7 * sysInfo->freqSystemBus / 2; 68 break; 69 case 0x28: 70 sysInfo->freqProcessor = 4 * sysInfo->freqSystemBus; 71 break; 72 case 0x1d: 73 sysInfo->freqProcessor = 9 * sysInfo->freqSystemBus / 2; 74 break; 75 default: 76 sysInfo->freqProcessor = e600_ratio + sysInfo->freqSystemBus; 77 break; 78 } 79 80 #if defined(CONFIG_SYS_LBC_LCRR) 81 /* We will program LCRR to this value later */ 82 lcrr_div = CONFIG_SYS_LBC_LCRR & LCRR_CLKDIV; 83 #else 84 lcrr_div = in_be32(&immap->im_lbc.lcrr) & LCRR_CLKDIV; 85 #endif 86 if (lcrr_div == 2 || lcrr_div == 4 || lcrr_div == 8) { 87 sysInfo->freqLocalBus = sysInfo->freqSystemBus / (lcrr_div * 2); 88 } else { 89 /* In case anyone cares what the unknown value is */ 90 sysInfo->freqLocalBus = lcrr_div; 91 } 92 } 93 94 95 /* 96 * Measure CPU clock speed (core clock GCLK1, GCLK2) 97 * (Approx. GCLK frequency in Hz) 98 */ 99 100 int get_clocks(void) 101 { 102 sys_info_t sys_info; 103 104 get_sys_info(&sys_info); 105 gd->cpu_clk = sys_info.freqProcessor; 106 gd->bus_clk = sys_info.freqSystemBus; 107 gd->arch.lbc_clk = sys_info.freqLocalBus; 108 109 /* 110 * The base clock for I2C depends on the actual SOC. Unfortunately, 111 * there is no pattern that can be used to determine the frequency, so 112 * the only choice is to look up the actual SOC number and use the value 113 * for that SOC. This information is taken from application note 114 * AN2919. 115 */ 116 #ifdef CONFIG_MPC8610 117 gd->arch.i2c1_clk = sys_info.freqSystemBus; 118 #else 119 gd->arch.i2c1_clk = sys_info.freqSystemBus / 2; 120 #endif 121 gd->arch.i2c2_clk = gd->arch.i2c1_clk; 122 123 if (gd->cpu_clk != 0) 124 return 0; 125 else 126 return 1; 127 } 128 129 130 /* 131 * get_bus_freq 132 * Return system bus freq in Hz 133 */ 134 135 ulong get_bus_freq(ulong dummy) 136 { 137 ulong val; 138 sys_info_t sys_info; 139 140 get_sys_info(&sys_info); 141 val = sys_info.freqSystemBus; 142 143 return val; 144 } 145