arch/powerpc/cpu/mpc5xxx/speed.c

   1 /*
   2  * (C) Copyright 2000-2002
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <mpc5xxx.h>
  10 #include <asm/processor.h>
  11
  12 DECLARE_GLOBAL_DATA_PTR;
  13
  14 /* ------------------------------------------------------------------------- */
  15
  16 /* Bus-to-Core Multipliers */
  17
  18 static int bus2core[] = {
  19         3, 2, 2, 2, 4, 4, 5, 9,
  20         6, 11, 8, 10, 3, 12, 7, 0,
  21         6, 5, 13, 2, 14, 4, 15, 9,
  22         0, 11, 8, 10, 16, 12, 7, 0
  23 };
  24 /* ------------------------------------------------------------------------- */
  25
  26 /*
  27  *
  28  */
  29
  30 int get_clocks (void)
  31 {
  32         ulong val, vco;
  33
  34 #if !defined(CONFIG_SYS_MPC5XXX_CLKIN)
  35 #error clock measuring not implemented yet - define CONFIG_SYS_MPC5XXX_CLKIN
  36 #endif
  37
  38         val = *(vu_long *)MPC5XXX_CDM_PORCFG;
  39         if (val & (1 << 6)) {
  40                 vco = CONFIG_SYS_MPC5XXX_CLKIN * 12;
  41         } else {
  42                 vco = CONFIG_SYS_MPC5XXX_CLKIN * 16;
  43         }
  44         if (val & (1 << 5)) {
  45                 gd->bus_clk = vco / 8;
  46         } else {
  47                 gd->bus_clk = vco / 4;
  48         }
  49         gd->cpu_clk = gd->bus_clk * bus2core[val & 0x1f] / 2;
  50
  51         val = *(vu_long *)MPC5XXX_CDM_CFG;
  52         if (val & (1 << 8)) {
  53                 gd->arch.ipb_clk = gd->bus_clk / 2;
  54         } else {
  55                 gd->arch.ipb_clk = gd->bus_clk;
  56         }
  57         switch (val & 3) {
  58         case 0:
  59                 gd->pci_clk = gd->arch.ipb_clk;
  60                 break;
  61         case 1:
  62                 gd->pci_clk = gd->arch.ipb_clk / 2;
  63                 break;
  64         default:
  65                 gd->pci_clk = gd->bus_clk / 4;
  66                 break;
  67         }
  68
  69         return (0);
  70 }
  71
  72 int prt_mpc5xxx_clks (void)
  73 {
  74         char buf1[32], buf2[32], buf3[32];
  75
  76         printf ("       Bus %s MHz, IPB %s MHz, PCI %s MHz\n",
  77                 strmhz(buf1, gd->bus_clk),
  78                 strmhz(buf2, gd->arch.ipb_clk),
  79                 strmhz(buf3, gd->pci_clk)
  80         );
  81         return (0);
  82 }
  83
  84 /* ------------------------------------------------------------------------- */