LXR uboot/arch/powerpc/cpu/mpc86xx/speed.c

   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
  17DECLARE_GLOBAL_DATA_PTR;
  18
  19/* used in some defintiions of CONFIG_SYS_CLK_FREQ */
  20extern unsigned long get_board_sys_clk(unsigned long dummy);
  21
  22void 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        uint lcrr_div;
  28
  29        plat_ratio = (gur->porpllsr) & 0x0000003e;
  30        plat_ratio >>= 1;
  31
  32        switch (plat_ratio) {
  33        case 0x0:
  34                sys_info->freq_systembus = 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                sys_info->freq_systembus = plat_ratio * CONFIG_SYS_CLK_FREQ;
  47                break;
  48        default:
  49                sys_info->freq_systembus = 0;
  50                break;
  51        }
  52
  53        e600_ratio = (gur->porpllsr) & 0x003f0000;
  54        e600_ratio >>= 16;
  55
  56        switch (e600_ratio) {
  57        case 0x10:
  58                sys_info->freq_processor = 2 * sys_info->freq_systembus;
  59                break;
  60        case 0x19:
  61                sys_info->freq_processor = 5 * sys_info->freq_systembus / 2;
  62                break;
  63        case 0x20:
  64                sys_info->freq_processor = 3 * sys_info->freq_systembus;
  65                break;
  66        case 0x39:
  67                sys_info->freq_processor = 7 * sys_info->freq_systembus / 2;
  68                break;
  69        case 0x28:
  70                sys_info->freq_processor = 4 * sys_info->freq_systembus;
  71                break;
  72        case 0x1d:
  73                sys_info->freq_processor = 9 * sys_info->freq_systembus / 2;
  74                break;
  75        default:
  76                sys_info->freq_processor = e600_ratio +
  77                                                sys_info->freq_systembus;
  78                break;
  79        }
  80
  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;
  84#else
  85        lcrr_div = in_be32(&immap->im_lbc.lcrr) & LCRR_CLKDIV;
  86#endif
  87        if (lcrr_div == 2 || lcrr_div == 4 || lcrr_div == 8) {
  88                sys_info->freq_localbus = sys_info->freq_systembus
  89                                                        / (lcrr_div * 2);
  90        } else {
  91                /* In case anyone cares what the unknown value is */
  92                sys_info->freq_localbus = lcrr_div;
  93        }
  94}
  95
  96
  97/*
  98 * Measure CPU clock speed (core clock GCLK1, GCLK2)
  99 * (Approx. GCLK frequency in Hz)
 100 */
 101
 102int get_clocks(void)
 103{
 104        sys_info_t sys_info;
 105
 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;
 110
 111        /*
 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
 116         * AN2919.
 117         */
 118#ifdef CONFIG_ARCH_MPC8610
 119        gd->arch.i2c1_clk = sys_info.freq_systembus;
 120#else
 121        gd->arch.i2c1_clk = sys_info.freq_systembus / 2;
 122#endif
 123        gd->arch.i2c2_clk = gd->arch.i2c1_clk;
 124
 125        if (gd->cpu_clk != 0)
 126                return 0;
 127        else
 128                return 1;
 129}
 130
 131
 132/*
 133 * get_bus_freq
 134 *      Return system bus freq in Hz
 135 */
 136
 137ulong get_bus_freq(ulong dummy)
 138{
 139        ulong val;
 140        sys_info_t sys_info;
 141
 142        get_sys_info(&sys_info);
 143        val = sys_info.freq_systembus;
 144
 145        return val;
 146}
 147