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 *sys_info) 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 28 plat_ratio = (gur->porpllsr) & 0x0000003e; 29 plat_ratio >>= 1; 30 31 switch (plat_ratio) { 32 case 0x0: 33 sys_info->freq_systembus = 16 * CONFIG_SYS_CLK_FREQ; 34 break; 35 case 0x02: 36 case 0x03: 37 case 0x04: 38 case 0x05: 39 case 0x06: 40 case 0x08: 41 case 0x09: 42 case 0x0a: 43 case 0x0c: 44 case 0x10: 45 sys_info->freq_systembus = plat_ratio * CONFIG_SYS_CLK_FREQ; 46 break; 47 default: 48 sys_info->freq_systembus = 0; 49 break; 50 } 51 52 e600_ratio = (gur->porpllsr) & 0x003f0000; 53 e600_ratio >>= 16; 54 55 switch (e600_ratio) { 56 case 0x10: 57 sys_info->freq_processor = 2 * sys_info->freq_systembus; 58 break; 59 case 0x19: 60 sys_info->freq_processor = 5 * sys_info->freq_systembus / 2; 61 break; 62 case 0x20: 63 sys_info->freq_processor = 3 * sys_info->freq_systembus; 64 break; 65 case 0x39: 66 sys_info->freq_processor = 7 * sys_info->freq_systembus / 2; 67 break; 68 case 0x28: 69 sys_info->freq_processor = 4 * sys_info->freq_systembus; 70 break; 71 case 0x1d: 72 sys_info->freq_processor = 9 * sys_info->freq_systembus / 2; 73 break; 74 default: 75 sys_info->freq_processor = e600_ratio + 76 sys_info->freq_systembus; 77 break; 78 } 79 80 sys_info->freq_localbus = sys_info->freq_systembus; 81 } 82 83 84 /* 85 * Measure CPU clock speed (core clock GCLK1, GCLK2) 86 * (Approx. GCLK frequency in Hz) 87 */ 88 89 int get_clocks(void) 90 { 91 sys_info_t sys_info; 92 93 get_sys_info(&sys_info); 94 gd->cpu_clk = sys_info.freq_processor; 95 gd->bus_clk = sys_info.freq_systembus; 96 gd->arch.lbc_clk = sys_info.freq_localbus; 97 98 /* 99 * The base clock for I2C depends on the actual SOC. Unfortunately, 100 * there is no pattern that can be used to determine the frequency, so 101 * the only choice is to look up the actual SOC number and use the value 102 * for that SOC. This information is taken from application note 103 * AN2919. 104 */ 105 #ifdef CONFIG_ARCH_MPC8610 106 gd->arch.i2c1_clk = sys_info.freq_systembus; 107 #else 108 gd->arch.i2c1_clk = sys_info.freq_systembus / 2; 109 #endif 110 gd->arch.i2c2_clk = gd->arch.i2c1_clk; 111 112 if (gd->cpu_clk != 0) 113 return 0; 114 else 115 return 1; 116 } 117 118 119 /* 120 * get_bus_freq 121 * Return system bus freq in Hz 122 */ 123 124 ulong get_bus_freq(ulong dummy) 125 { 126 ulong val; 127 sys_info_t sys_info; 128 129 get_sys_info(&sys_info); 130 val = sys_info.freq_systembus; 131 132 return val; 133 } 134