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/*
* (C) Copyright 2000-2007
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* Copyright (C) 2004-2006 Freescale Semiconductor, Inc.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
* Based on the MPC83xx code.
*/
#include <common.h>
#include <mpc512x.h>
#include <command.h>
#include <asm/processor.h>
DECLARE_GLOBAL_DATA_PTR;
static int spmf_mult[] = {
68, 1, 12, 16,
20, 24, 28, 32,
36, 40, 44, 48,
52, 56, 60, 64
};
static int cpmf_mult[][2] = {
{0, 1}, {0, 1}, /* 0 and 1 are not valid */
{1, 1}, {3, 2},
{2, 1}, {5, 2},
{3, 1}, {7, 2},
{0, 1}, {0, 1}, /* and all above 7 are not valid too */
{0, 1}, {0, 1},
{0, 1}, {0, 1},
{0, 1}, {0, 1}
};
static int sys_dividors[][2] = {
{2, 1}, {5, 2}, {3, 1}, {7, 2}, {4, 1},
{9, 2}, {5, 1}, {7, 1}, {6, 1}, {8, 1},
{9, 1}, {11, 1}, {10, 1}, {12, 1}, {13, 1},
{15, 1}, {14, 1}, {16, 1}, {17, 1}, {19, 1},
{18, 1}, {20, 1}, {21, 1}, {23, 1}, {22, 1},
{24, 1}, {25, 1}, {27, 1}, {26, 1}, {28, 1},
{29, 1}, {31, 1}, {30, 1}, {32, 1}, {33, 1}
};
int get_clocks (void)
{
volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
u8 spmf;
u8 cpmf;
u8 sys_div;
u8 ips_div;
u8 pci_div;
u32 ref_clk = CONFIG_SYS_MPC512X_CLKIN;
u32 spll;
u32 sys_clk;
u32 core_clk;
u32 csb_clk;
u32 ips_clk;
u32 pci_clk;
if ((im->sysconf.immrbar & IMMRBAR_BASE_ADDR) != (u32) im)
return -1;
spmf = (im->clk.spmr & SPMR_SPMF) >> SPMR_SPMF_SHIFT;
spll = ref_clk * spmf_mult[spmf];
sys_div = (im->clk.scfr[1] & SCFR2_SYS_DIV) >> SCFR2_SYS_DIV_SHIFT;
sys_clk = (spll * sys_dividors[sys_div][1]) / sys_dividors[sys_div][0];
csb_clk = sys_clk / 2;
cpmf = (im->clk.spmr & SPMR_CPMF) >> SPMR_CPMF_SHIFT;
core_clk = (csb_clk * cpmf_mult[cpmf][0]) / cpmf_mult[cpmf][1];
ips_div = (im->clk.scfr[0] & SCFR1_IPS_DIV_MASK) >> SCFR1_IPS_DIV_SHIFT;
if (ips_div != 0) {
ips_clk = csb_clk / ips_div;
} else {
/* in case we cannot get a sane IPS divisor, fail gracefully */
ips_clk = 0;
}
pci_div = (im->clk.scfr[0] & SCFR1_PCI_DIV_MASK) >> SCFR1_PCI_DIV_SHIFT;
if (pci_div != 0) {
pci_clk = csb_clk / pci_div;
} else {
/* in case we cannot get a sane IPS divisor, fail gracefully */
pci_clk = 333333;
}
gd->ips_clk = ips_clk;
gd->pci_clk = pci_clk;
gd->csb_clk = csb_clk;
gd->cpu_clk = core_clk;
gd->bus_clk = csb_clk;
return 0;
}
/********************************************
* get_bus_freq
* return system bus freq in Hz
*********************************************/
ulong get_bus_freq (ulong dummy)
{
return gd->csb_clk;
}
int do_clocks (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
{
char buf[32];
printf("Clock configuration:\n");
printf(" CPU: %-4s MHz\n", strmhz(buf, gd->cpu_clk));
printf(" Coherent System Bus: %-4s MHz\n", strmhz(buf, gd->csb_clk));
printf(" IPS Bus: %-4s MHz\n", strmhz(buf, gd->ips_clk));
printf(" PCI: %-4s MHz\n", strmhz(buf, gd->pci_clk));
printf(" DDR: %-4s MHz\n", strmhz(buf, 2*gd->csb_clk));
return 0;
}
U_BOOT_CMD(clocks, 1, 0, do_clocks,
"print clock configuration",
" clocks"
);
int prt_mpc512x_clks (void)
{
do_clocks (NULL, 0, 0, NULL);
return (0);
}
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