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/*
* Copyright 2004 Freescale Semiconductor.
* Jeff Brown
* Srikanth Srinivasan (srikanth.srinivasan@freescale.com)
*
* (C) Copyright 2000-2002
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* 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
*/
#include <common.h>
#include <mpc86xx.h>
#include <asm/processor.h>
#include <asm/io.h>
DECLARE_GLOBAL_DATA_PTR;
/* used in some defintiions of CONFIG_SYS_CLK_FREQ */
extern unsigned long get_board_sys_clk(unsigned long dummy);
void get_sys_info(sys_info_t *sysInfo)
{
volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
volatile ccsr_gur_t *gur = &immap->im_gur;
uint plat_ratio, e600_ratio;
uint lcrr_div;
plat_ratio = (gur->porpllsr) & 0x0000003e;
plat_ratio >>= 1;
switch (plat_ratio) {
case 0x0:
sysInfo->freqSystemBus = 16 * CONFIG_SYS_CLK_FREQ;
break;
case 0x02:
case 0x03:
case 0x04:
case 0x05:
case 0x06:
case 0x08:
case 0x09:
case 0x0a:
case 0x0c:
case 0x10:
sysInfo->freqSystemBus = plat_ratio * CONFIG_SYS_CLK_FREQ;
break;
default:
sysInfo->freqSystemBus = 0;
break;
}
e600_ratio = (gur->porpllsr) & 0x003f0000;
e600_ratio >>= 16;
switch (e600_ratio) {
case 0x10:
sysInfo->freqProcessor = 2 * sysInfo->freqSystemBus;
break;
case 0x19:
sysInfo->freqProcessor = 5 * sysInfo->freqSystemBus / 2;
break;
case 0x20:
sysInfo->freqProcessor = 3 * sysInfo->freqSystemBus;
break;
case 0x39:
sysInfo->freqProcessor = 7 * sysInfo->freqSystemBus / 2;
break;
case 0x28:
sysInfo->freqProcessor = 4 * sysInfo->freqSystemBus;
break;
case 0x1d:
sysInfo->freqProcessor = 9 * sysInfo->freqSystemBus / 2;
break;
default:
sysInfo->freqProcessor = e600_ratio + sysInfo->freqSystemBus;
break;
}
#if defined(CONFIG_SYS_LBC_LCRR)
/* We will program LCRR to this value later */
lcrr_div = CONFIG_SYS_LBC_LCRR & LCRR_CLKDIV;
#else
{
volatile ccsr_lbc_t *lbc = &immap->im_lbc;
lcrr_div = in_be32(&lbc->lcrr) & LCRR_CLKDIV;
}
#endif
if (lcrr_div == 2 || lcrr_div == 4 || lcrr_div == 8) {
sysInfo->freqLocalBus = sysInfo->freqSystemBus / (lcrr_div * 2);
} else {
/* In case anyone cares what the unknown value is */
sysInfo->freqLocalBus = lcrr_div;
}
}
/*
* Measure CPU clock speed (core clock GCLK1, GCLK2)
* (Approx. GCLK frequency in Hz)
*/
int get_clocks(void)
{
sys_info_t sys_info;
get_sys_info(&sys_info);
gd->cpu_clk = sys_info.freqProcessor;
gd->bus_clk = sys_info.freqSystemBus;
gd->lbc_clk = sys_info.freqLocalBus;
/*
* The base clock for I2C depends on the actual SOC. Unfortunately,
* there is no pattern that can be used to determine the frequency, so
* the only choice is to look up the actual SOC number and use the value
* for that SOC. This information is taken from application note
* AN2919.
*/
#ifdef CONFIG_MPC8610
gd->i2c1_clk = sys_info.freqSystemBus;
#else
gd->i2c1_clk = sys_info.freqSystemBus / 2;
#endif
gd->i2c2_clk = gd->i2c1_clk;
if (gd->cpu_clk != 0)
return 0;
else
return 1;
}
/*
* get_bus_freq
* Return system bus freq in Hz
*/
ulong get_bus_freq(ulong dummy)
{
ulong val;
sys_info_t sys_info;
get_sys_info(&sys_info);
val = sys_info.freqSystemBus;
return val;
}
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