mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-30 00:21:06 +00:00
135 lines
3.5 KiB
C
135 lines
3.5 KiB
C
/*
|
|
* (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 *) CFG_IMMR;
|
|
u8 spmf;
|
|
u8 cpmf;
|
|
u8 sys_div;
|
|
u8 ips_div;
|
|
u32 ref_clk = CFG_MPC512X_CLKIN;
|
|
u32 spll;
|
|
u32 sys_clk;
|
|
u32 core_clk;
|
|
u32 csb_clk;
|
|
u32 ips_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;
|
|
}
|
|
|
|
gd->ipb_clk = ips_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[])
|
|
{
|
|
printf ("Clock configuration:\n");
|
|
printf (" CPU: %4d MHz\n", gd->cpu_clk / 1000000);
|
|
printf (" Coherent System Bus: %4d MHz\n", gd->csb_clk / 1000000);
|
|
printf (" IPS Bus: %4d MHz\n", gd->ipb_clk / 1000000);
|
|
printf (" DDR: %4d MHz\n", 2 * gd->csb_clk / 1000000);
|
|
return 0;
|
|
}
|
|
|
|
U_BOOT_CMD(clocks, 1, 0, do_clocks,
|
|
"clocks - print clock configuration\n",
|
|
" clocks\n"
|
|
);
|
|
|
|
int prt_mpc512x_clks (void)
|
|
{
|
|
do_clocks (NULL, 0, 0, NULL);
|
|
return (0);
|
|
}
|