mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-11 22:03:15 +00:00
116 lines
3.3 KiB
C
116 lines
3.3 KiB
C
/*
|
|
* (C) Copyright 2003
|
|
* 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 <asm/inca-ip.h>
|
|
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* get_cpuclk - returns the frequency of the CPU.
|
|
*
|
|
* Gets the value directly from the INCA-IP hardware.
|
|
*
|
|
* RETURNS:
|
|
* 150.000.000 for 150 MHz
|
|
* 133.333.333 for 133 MHz (= 400MHz/3)
|
|
* 100.000.000 for 100 MHz (= 400MHz/4)
|
|
* NOTE:
|
|
* This functions should be used by the hardware driver to get the correct
|
|
* frequency of the CPU. Don't use the macros, which are set to init the CPU
|
|
* frequency in the ROM code.
|
|
*/
|
|
uint incaip_get_cpuclk (void)
|
|
{
|
|
/*-------------------------------------------------------------------------*/
|
|
/* CPU Clock Input Multiplexer (MUX I) */
|
|
/* Multiplexer MUX I selects the maximum input clock to the CPU. */
|
|
/*-------------------------------------------------------------------------*/
|
|
if (*((volatile ulong *) INCA_IP_CGU_CGU_MUXCR) &
|
|
INCA_IP_CGU_CGU_MUXCR_MUXI) {
|
|
/* MUX I set to 150 MHz clock */
|
|
return 150000000;
|
|
} else {
|
|
/* MUX I set to 100/133 MHz clock */
|
|
if (*((volatile ulong *) INCA_IP_CGU_CGU_DIVCR) & 0x40) {
|
|
/* Division value is 1/3, maximum CPU operating */
|
|
/* frequency is 133.3 MHz */
|
|
return 133333333;
|
|
} else {
|
|
/* Division value is 1/4, maximum CPU operating */
|
|
/* frequency is 100 MHz */
|
|
return 100000000;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* get_fpiclk - returns the frequency of the FPI bus.
|
|
*
|
|
* Gets the value directly from the INCA-IP hardware.
|
|
*
|
|
* RETURNS: Frquency in Hz
|
|
*
|
|
* NOTE:
|
|
* This functions should be used by the hardware driver to get the correct
|
|
* frequency of the CPU. Don't use the macros, which are set to init the CPU
|
|
* frequency in the ROM code.
|
|
* The calculation for the
|
|
*/
|
|
uint incaip_get_fpiclk (void)
|
|
{
|
|
uint clkCPU;
|
|
|
|
clkCPU = incaip_get_cpuclk ();
|
|
|
|
switch (*((volatile ulong *) INCA_IP_CGU_CGU_DIVCR) & 0xC) {
|
|
case 0x4:
|
|
return clkCPU >> 1; /* devided by 2 */
|
|
break;
|
|
case 0x8:
|
|
return clkCPU >> 2; /* devided by 4 */
|
|
break;
|
|
default:
|
|
return clkCPU;
|
|
break;
|
|
}
|
|
}
|
|
|
|
int incaip_set_cpuclk (void)
|
|
{
|
|
extern void ebu_init(long);
|
|
extern void cgu_init(long);
|
|
extern void sdram_init(long);
|
|
char tmp[64];
|
|
ulong cpuclk;
|
|
|
|
if (getenv_r ("cpuclk", tmp, sizeof (tmp)) > 0) {
|
|
cpuclk = simple_strtoul (tmp, NULL, 10) * 1000000;
|
|
cgu_init (cpuclk);
|
|
ebu_init (cpuclk);
|
|
sdram_init (cpuclk);
|
|
}
|
|
|
|
return 0;
|
|
}
|