LXR uboot/arch/powerpc/cpu/mpc512x/speed.c

   1/*
   2 * (C) Copyright 2000-2009
   3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4 *
   5 * Copyright (C) 2004-2006 Freescale Semiconductor, Inc.
   6 *
   7 * See file CREDITS for list of people who contributed to this
   8 * project.
   9 *
  10 * This program is free software; you can redistribute it and/or
  11 * modify it under the terms of the GNU General Public License as
  12 * published by the Free Software Foundation; either version 2 of
  13 * the License, or (at your option) any later version.
  14 *
  15 * This program is distributed in the hope that it will be useful,
  16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 * GNU General Public License for more details.
  19 *
  20 * You should have received a copy of the GNU General Public License
  21 * along with this program; if not, write to the Free Software
  22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  23 * MA 02111-1307 USA
  24 *
  25 * Based on the MPC83xx code.
  26 */
  27
  28#include <common.h>
  29#include <command.h>
  30#include <asm/io.h>
  31#include <asm/processor.h>
  32
  33DECLARE_GLOBAL_DATA_PTR;
  34
  35static int spmf_mult[] = {
  36        68, 1, 12, 16,
  37        20, 24, 28, 32,
  38        36, 40, 44, 48,
  39        52, 56, 60, 64
  40};
  41
  42static int cpmf_mult[][2] = {
  43        {0, 1}, {0, 1}, /* 0 and 1 are not valid */
  44        {1, 1}, {3, 2},
  45        {2, 1}, {5, 2},
  46        {3, 1}, {7, 2},
  47        {0, 1}, {0, 1}, /* and all above 7 are not valid too */
  48        {0, 1}, {0, 1},
  49        {0, 1}, {0, 1},
  50        {0, 1}, {0, 1}
  51};
  52
  53static int sys_dividors[][2] = {
  54        {2, 1}, {5, 2}, {3, 1}, {7, 2}, {4, 1},
  55        {9, 2}, {5, 1}, {7, 1}, {6, 1}, {8, 1},
  56        {9, 1}, {11, 1}, {10, 1}, {12, 1}, {13, 1},
  57        {15, 1}, {14, 1}, {16, 1}, {17, 1}, {19, 1},
  58        {18, 1}, {20, 1}, {21, 1}, {23, 1}, {22, 1},
  59        {24, 1}, {25, 1}, {27, 1}, {26, 1}, {28, 1},
  60        {29, 1}, {31, 1}, {30, 1}, {32, 1}, {33, 1}
  61};
  62
  63int get_clocks (void)
  64{
  65        volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
  66        u8 spmf;
  67        u8 cpmf;
  68        u8 sys_div;
  69        u8 ips_div;
  70        u8 pci_div;
  71        u32 ref_clk = CONFIG_SYS_MPC512X_CLKIN;
  72        u32 spll;
  73        u32 sys_clk;
  74        u32 core_clk;
  75        u32 csb_clk;
  76        u32 ips_clk;
  77        u32 pci_clk;
  78        u32 reg;
  79
  80        reg = in_be32(&im->sysconf.immrbar);
  81        if ((reg & IMMRBAR_BASE_ADDR) != (u32) im)
  82                return -1;
  83
  84        reg = in_be32(&im->clk.spmr);
  85        spmf = (reg & SPMR_SPMF) >> SPMR_SPMF_SHIFT;
  86        spll = ref_clk * spmf_mult[spmf];
  87
  88        reg = in_be32(&im->clk.scfr[1]);
  89        sys_div = (reg & SCFR2_SYS_DIV) >> SCFR2_SYS_DIV_SHIFT;
  90        sys_clk = (spll * sys_dividors[sys_div][1]) / sys_dividors[sys_div][0];
  91
  92        csb_clk = sys_clk / 2;
  93
  94        reg = in_be32(&im->clk.spmr);
  95        cpmf = (reg & SPMR_CPMF) >> SPMR_CPMF_SHIFT;
  96        core_clk = (csb_clk * cpmf_mult[cpmf][0]) / cpmf_mult[cpmf][1];
  97
  98        reg = in_be32(&im->clk.scfr[0]);
  99        ips_div = (reg & SCFR1_IPS_DIV_MASK) >> SCFR1_IPS_DIV_SHIFT;
 100        if (ips_div != 0) {
 101                ips_clk = csb_clk / ips_div;
 102        } else {
 103                /* in case we cannot get a sane IPS divisor, fail gracefully */
 104                ips_clk = 0;
 105        }
 106
 107        reg = in_be32(&im->clk.scfr[0]);
 108        pci_div = (reg & SCFR1_PCI_DIV_MASK) >> SCFR1_PCI_DIV_SHIFT;
 109        if (pci_div != 0) {
 110                pci_clk = csb_clk / pci_div;
 111        } else {
 112                /* in case we cannot get a sane IPS divisor, fail gracefully */
 113                pci_clk = 333333;
 114        }
 115
 116        gd->ips_clk = ips_clk;
 117        gd->pci_clk = pci_clk;
 118        gd->csb_clk = csb_clk;
 119        gd->cpu_clk = core_clk;
 120        gd->bus_clk = csb_clk;
 121        return 0;
 122
 123}
 124
 125/********************************************
 126 * get_bus_freq
 127 * return system bus freq in Hz
 128 *********************************************/
 129ulong get_bus_freq (ulong dummy)
 130{
 131        return gd->csb_clk;
 132}
 133
 134int do_clocks (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 135{
 136        char buf[32];
 137
 138        printf("Clock configuration:\n");
 139        printf("  CPU:                 %-4s MHz\n", strmhz(buf, gd->cpu_clk));
 140        printf("  Coherent System Bus: %-4s MHz\n", strmhz(buf, gd->csb_clk));
 141        printf("  IPS Bus:             %-4s MHz\n", strmhz(buf, gd->ips_clk));
 142        printf("  PCI:                 %-4s MHz\n", strmhz(buf, gd->pci_clk));
 143        printf("  DDR:                 %-4s MHz\n", strmhz(buf, 2*gd->csb_clk));
 144        return 0;
 145}
 146
 147U_BOOT_CMD(clocks, 1, 0, do_clocks,
 148        "print clock configuration",
 149        "    clocks"
 150);
 151
 152int prt_mpc512x_clks (void)
 153{
 154        do_clocks (NULL, 0, 0, NULL);
 155        return (0);
 156}
 157