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      1 // SPDX-License-Identifier: GPL-2.0+
      2 /*
      3  * Copyright 2004 Freescale Semiconductor.
      4  * Jeff Brown
      5  * Srikanth Srinivasan (srikanth.srinivasan (at) freescale.com)
      6  *
      7  * (C) Copyright 2000-2002
      8  * Wolfgang Denk, DENX Software Engineering, wd (at) denx.de.
      9  */
     10 
     11 #include <common.h>
     12 #include <mpc86xx.h>
     13 #include <asm/processor.h>
     14 #include <asm/io.h>
     15 
     16 DECLARE_GLOBAL_DATA_PTR;
     17 
     18 /* used in some defintiions of CONFIG_SYS_CLK_FREQ */
     19 extern unsigned long get_board_sys_clk(unsigned long dummy);
     20 
     21 void get_sys_info(sys_info_t *sys_info)
     22 {
     23 	volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
     24 	volatile ccsr_gur_t *gur = &immap->im_gur;
     25 	uint plat_ratio, e600_ratio;
     26 
     27 	plat_ratio = (gur->porpllsr) & 0x0000003e;
     28 	plat_ratio >>= 1;
     29 
     30 	switch (plat_ratio) {
     31 	case 0x0:
     32 		sys_info->freq_systembus = 16 * CONFIG_SYS_CLK_FREQ;
     33 		break;
     34 	case 0x02:
     35 	case 0x03:
     36 	case 0x04:
     37 	case 0x05:
     38 	case 0x06:
     39 	case 0x08:
     40 	case 0x09:
     41 	case 0x0a:
     42 	case 0x0c:
     43 	case 0x10:
     44 		sys_info->freq_systembus = plat_ratio * CONFIG_SYS_CLK_FREQ;
     45 		break;
     46 	default:
     47 		sys_info->freq_systembus = 0;
     48 		break;
     49 	}
     50 
     51 	e600_ratio = (gur->porpllsr) & 0x003f0000;
     52 	e600_ratio >>= 16;
     53 
     54 	switch (e600_ratio) {
     55 	case 0x10:
     56 		sys_info->freq_processor = 2 * sys_info->freq_systembus;
     57 		break;
     58 	case 0x19:
     59 		sys_info->freq_processor = 5 * sys_info->freq_systembus / 2;
     60 		break;
     61 	case 0x20:
     62 		sys_info->freq_processor = 3 * sys_info->freq_systembus;
     63 		break;
     64 	case 0x39:
     65 		sys_info->freq_processor = 7 * sys_info->freq_systembus / 2;
     66 		break;
     67 	case 0x28:
     68 		sys_info->freq_processor = 4 * sys_info->freq_systembus;
     69 		break;
     70 	case 0x1d:
     71 		sys_info->freq_processor = 9 * sys_info->freq_systembus / 2;
     72 		break;
     73 	default:
     74 		sys_info->freq_processor = e600_ratio +
     75 						sys_info->freq_systembus;
     76 		break;
     77 	}
     78 
     79 	sys_info->freq_localbus = sys_info->freq_systembus;
     80 }
     81 
     82 
     83 /*
     84  * Measure CPU clock speed (core clock GCLK1, GCLK2)
     85  * (Approx. GCLK frequency in Hz)
     86  */
     87 
     88 int get_clocks(void)
     89 {
     90 	sys_info_t sys_info;
     91 
     92 	get_sys_info(&sys_info);
     93 	gd->cpu_clk = sys_info.freq_processor;
     94 	gd->bus_clk = sys_info.freq_systembus;
     95 	gd->arch.lbc_clk = sys_info.freq_localbus;
     96 
     97 	/*
     98 	 * The base clock for I2C depends on the actual SOC.  Unfortunately,
     99 	 * there is no pattern that can be used to determine the frequency, so
    100 	 * the only choice is to look up the actual SOC number and use the value
    101 	 * for that SOC. This information is taken from application note
    102 	 * AN2919.
    103 	 */
    104 #ifdef CONFIG_ARCH_MPC8610
    105 	gd->arch.i2c1_clk = sys_info.freq_systembus;
    106 #else
    107 	gd->arch.i2c1_clk = sys_info.freq_systembus / 2;
    108 #endif
    109 	gd->arch.i2c2_clk = gd->arch.i2c1_clk;
    110 
    111 	if (gd->cpu_clk != 0)
    112 		return 0;
    113 	else
    114 		return 1;
    115 }
    116 
    117 
    118 /*
    119  * get_bus_freq
    120  *	Return system bus freq in Hz
    121  */
    122 
    123 ulong get_bus_freq(ulong dummy)
    124 {
    125 	ulong val;
    126 	sys_info_t sys_info;
    127 
    128 	get_sys_info(&sys_info);
    129 	val = sys_info.freq_systembus;
    130 
    131 	return val;
    132 }
    133