2 * (C) Copyright 2000-2009
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.
32 #include <asm/processor.h>
34 DECLARE_GLOBAL_DATA_PTR;
36 static int spmf_mult[] = {
43 static int cpmf_mult[][2] = {
44 {0, 1}, {0, 1}, /* 0 and 1 are not valid */
48 {0, 1}, {0, 1}, /* and all above 7 are not valid too */
54 static int sys_dividors[][2] = {
55 {2, 1}, {5, 2}, {3, 1}, {7, 2}, {4, 1},
56 {9, 2}, {5, 1}, {7, 1}, {6, 1}, {8, 1},
57 {9, 1}, {11, 1}, {10, 1}, {12, 1}, {13, 1},
58 {15, 1}, {14, 1}, {16, 1}, {17, 1}, {19, 1},
59 {18, 1}, {20, 1}, {21, 1}, {23, 1}, {22, 1},
60 {24, 1}, {25, 1}, {27, 1}, {26, 1}, {28, 1},
61 {29, 1}, {31, 1}, {30, 1}, {32, 1}, {33, 1}
66 volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
72 u32 ref_clk = CONFIG_SYS_MPC512X_CLKIN;
81 reg = in_be32(&im->sysconf.immrbar);
82 if ((reg & IMMRBAR_BASE_ADDR) != (u32) im)
85 reg = in_be32(&im->clk.spmr);
86 spmf = (reg & SPMR_SPMF) >> SPMR_SPMF_SHIFT;
87 spll = ref_clk * spmf_mult[spmf];
89 reg = in_be32(&im->clk.scfr[1]);
90 sys_div = (reg & SCFR2_SYS_DIV) >> SCFR2_SYS_DIV_SHIFT;
91 sys_clk = (spll * sys_dividors[sys_div][1]) / sys_dividors[sys_div][0];
93 csb_clk = sys_clk / 2;
95 reg = in_be32(&im->clk.spmr);
96 cpmf = (reg & SPMR_CPMF) >> SPMR_CPMF_SHIFT;
97 core_clk = (csb_clk * cpmf_mult[cpmf][0]) / cpmf_mult[cpmf][1];
99 reg = in_be32(&im->clk.scfr[0]);
100 ips_div = (reg & SCFR1_IPS_DIV_MASK) >> SCFR1_IPS_DIV_SHIFT;
102 ips_clk = csb_clk / ips_div;
104 /* in case we cannot get a sane IPS divisor, fail gracefully */
108 reg = in_be32(&im->clk.scfr[0]);
109 pci_div = (reg & SCFR1_PCI_DIV_MASK) >> SCFR1_PCI_DIV_SHIFT;
111 pci_clk = csb_clk / pci_div;
113 /* in case we cannot get a sane IPS divisor, fail gracefully */
117 gd->ips_clk = ips_clk;
118 gd->pci_clk = pci_clk;
119 gd->csb_clk = csb_clk;
120 gd->cpu_clk = core_clk;
121 gd->bus_clk = csb_clk;
126 /********************************************
128 * return system bus freq in Hz
129 *********************************************/
130 ulong get_bus_freq (ulong dummy)
135 int do_clocks (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
139 printf("Clock configuration:\n");
140 printf(" CPU: %-4s MHz\n", strmhz(buf, gd->cpu_clk));
141 printf(" Coherent System Bus: %-4s MHz\n", strmhz(buf, gd->csb_clk));
142 printf(" IPS Bus: %-4s MHz\n", strmhz(buf, gd->ips_clk));
143 printf(" PCI: %-4s MHz\n", strmhz(buf, gd->pci_clk));
144 printf(" DDR: %-4s MHz\n", strmhz(buf, 2*gd->csb_clk));
148 U_BOOT_CMD(clocks, 1, 0, do_clocks,
149 "print clock configuration",
153 int prt_mpc512x_clks (void)
155 do_clocks (NULL, 0, 0, NULL);