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
  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 }