2 * Copyright 2004 Freescale Semiconductor.
4 * Srikanth Srinivasan (srikanth.srinivasan@freescale.com)
6 * (C) Copyright 2000-2002
7 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
9 * SPDX-License-Identifier: GPL-2.0+
14 #include <asm/processor.h>
17 DECLARE_GLOBAL_DATA_PTR;
19 /* used in some defintiions of CONFIG_SYS_CLK_FREQ */
20 extern unsigned long get_board_sys_clk(unsigned long dummy);
22 void get_sys_info(sys_info_t *sys_info)
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;
29 plat_ratio = (gur->porpllsr) & 0x0000003e;
34 sys_info->freq_systembus = 16 * CONFIG_SYS_CLK_FREQ;
46 sys_info->freq_systembus = plat_ratio * CONFIG_SYS_CLK_FREQ;
49 sys_info->freq_systembus = 0;
53 e600_ratio = (gur->porpllsr) & 0x003f0000;
58 sys_info->freq_processor = 2 * sys_info->freq_systembus;
61 sys_info->freq_processor = 5 * sys_info->freq_systembus / 2;
64 sys_info->freq_processor = 3 * sys_info->freq_systembus;
67 sys_info->freq_processor = 7 * sys_info->freq_systembus / 2;
70 sys_info->freq_processor = 4 * sys_info->freq_systembus;
73 sys_info->freq_processor = 9 * sys_info->freq_systembus / 2;
76 sys_info->freq_processor = e600_ratio +
77 sys_info->freq_systembus;
81 #if defined(CONFIG_SYS_LBC_LCRR)
82 /* We will program LCRR to this value later */
83 lcrr_div = CONFIG_SYS_LBC_LCRR & LCRR_CLKDIV;
85 lcrr_div = in_be32(&immap->im_lbc.lcrr) & LCRR_CLKDIV;
87 if (lcrr_div == 2 || lcrr_div == 4 || lcrr_div == 8) {
88 sys_info->freq_localbus = sys_info->freq_systembus
91 /* In case anyone cares what the unknown value is */
92 sys_info->freq_localbus = lcrr_div;
98 * Measure CPU clock speed (core clock GCLK1, GCLK2)
99 * (Approx. GCLK frequency in Hz)
106 get_sys_info(&sys_info);
107 gd->cpu_clk = sys_info.freq_processor;
108 gd->bus_clk = sys_info.freq_systembus;
109 gd->arch.lbc_clk = sys_info.freq_localbus;
112 * The base clock for I2C depends on the actual SOC. Unfortunately,
113 * there is no pattern that can be used to determine the frequency, so
114 * the only choice is to look up the actual SOC number and use the value
115 * for that SOC. This information is taken from application note
118 #ifdef CONFIG_ARCH_MPC8610
119 gd->arch.i2c1_clk = sys_info.freq_systembus;
121 gd->arch.i2c1_clk = sys_info.freq_systembus / 2;
123 gd->arch.i2c2_clk = gd->arch.i2c1_clk;
125 if (gd->cpu_clk != 0)
134 * Return system bus freq in Hz
137 ulong get_bus_freq(ulong dummy)
142 get_sys_info(&sys_info);
143 val = sys_info.freq_systembus;