2 * (C) Copyright 2000-2007
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 * Copyright (C) 2004-2006 Freescale Semiconductor, Inc.
7 * See file CREDITS for list of people who contributed to this
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.
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.
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,
25 * Based on the MPC83xx code.
31 #include <asm/processor.h>
33 DECLARE_GLOBAL_DATA_PTR;
35 static int spmf_mult[] = {
42 static int cpmf_mult[][2] = {
43 {0, 1}, {0, 1}, /* 0 and 1 are not valid */
47 {0, 1}, {0, 1}, /* and all above 7 are not valid too */
53 static 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}
65 volatile immap_t *im = (immap_t *) CFG_IMMR;
70 u32 ref_clk = CFG_MPC512X_CLKIN;
77 if ((im->sysconf.immrbar & IMMRBAR_BASE_ADDR) != (u32) im)
80 spmf = (im->clk.spmr & SPMR_SPMF) >> SPMR_SPMF_SHIFT;
81 spll = ref_clk * spmf_mult[spmf];
83 sys_div = (im->clk.scfr[1] & SCFR2_SYS_DIV) >> SCFR2_SYS_DIV_SHIFT;
84 sys_clk = (spll * sys_dividors[sys_div][1]) / sys_dividors[sys_div][0];
86 csb_clk = sys_clk / 2;
88 cpmf = (im->clk.spmr & SPMR_CPMF) >> SPMR_CPMF_SHIFT;
89 core_clk = (csb_clk * cpmf_mult[cpmf][0]) / cpmf_mult[cpmf][1];
91 ips_div = (im->clk.scfr[0] & SCFR1_IPS_DIV_MASK) >> SCFR1_IPS_DIV_SHIFT;
93 ips_clk = csb_clk / ips_div;
95 /* in case we cannot get a sane IPS divisor, fail gracefully */
99 gd->ipb_clk = ips_clk;
100 gd->csb_clk = csb_clk;
101 gd->cpu_clk = core_clk;
102 gd->bus_clk = csb_clk;
107 /********************************************
109 * return system bus freq in Hz
110 *********************************************/
111 ulong get_bus_freq (ulong dummy)
116 int do_clocks (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
118 printf ("Clock configuration:\n");
119 printf (" CPU: %4d MHz\n", gd->cpu_clk / 1000000);
120 printf (" Coherent System Bus: %4d MHz\n", gd->csb_clk / 1000000);
121 printf (" IPS Bus: %4d MHz\n", gd->ipb_clk / 1000000);
122 printf (" DDR: %4d MHz\n", 2 * gd->csb_clk / 1000000);
126 U_BOOT_CMD(clocks, 1, 0, do_clocks,
127 "clocks - print clock configuration\n",
131 int prt_mpc512x_clks (void)
133 do_clocks (NULL, 0, 0, NULL);