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117 lines
3.3 KiB
C
117 lines
3.3 KiB
C
/*
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* (C) Copyright 2003
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <asm/inca-ip.h>
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/*******************************************************************************
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*
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* get_cpuclk - returns the frequency of the CPU.
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*
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* Gets the value directly from the INCA-IP hardware.
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*
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* RETURNS:
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* 150.000.000 for 150 MHz
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* 133.333.333 for 133 MHz (= 400MHz/3)
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* 100.000.000 for 100 MHz (= 400MHz/4)
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* NOTE:
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* This functions should be used by the hardware driver to get the correct
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* frequency of the CPU. Don't use the macros, which are set to init the CPU
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* frequency in the ROM code.
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*/
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uint incaip_get_cpuclk (void)
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{
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/*-------------------------------------------------------------------------*/
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/* CPU Clock Input Multiplexer (MUX I) */
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/* Multiplexer MUX I selects the maximum input clock to the CPU. */
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/*-------------------------------------------------------------------------*/
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if (*((volatile ulong *) INCA_IP_CGU_CGU_MUXCR) &
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INCA_IP_CGU_CGU_MUXCR_MUXI) {
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/* MUX I set to 150 MHz clock */
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return 150000000;
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} else {
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/* MUX I set to 100/133 MHz clock */
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if (*((volatile ulong *) INCA_IP_CGU_CGU_DIVCR) & 0x40) {
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/* Division value is 1/3, maximum CPU operating */
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/* frequency is 133.3 MHz */
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return 133333333;
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} else {
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/* Division value is 1/4, maximum CPU operating */
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/* frequency is 100 MHz */
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return 100000000;
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}
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}
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}
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/*******************************************************************************
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*
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* get_fpiclk - returns the frequency of the FPI bus.
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*
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* Gets the value directly from the INCA-IP hardware.
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*
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* RETURNS: Frquency in Hz
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*
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* NOTE:
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* This functions should be used by the hardware driver to get the correct
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* frequency of the CPU. Don't use the macros, which are set to init the CPU
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* frequency in the ROM code.
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* The calculation for the
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*/
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uint incaip_get_fpiclk (void)
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{
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uint clkCPU;
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clkCPU = incaip_get_cpuclk ();
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switch (*((volatile ulong *) INCA_IP_CGU_CGU_DIVCR) & 0xC) {
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case 0x4:
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return clkCPU >> 1; /* devided by 2 */
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break;
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case 0x8:
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return clkCPU >> 2; /* devided by 4 */
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break;
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default:
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return clkCPU;
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break;
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}
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}
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int incaip_set_cpuclk (void)
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{
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extern void ebu_init(long);
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extern void cgu_init(long);
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extern void sdram_init(long);
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char tmp[64];
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ulong cpuclk;
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if (getenv_r ("cpuclk", tmp, sizeof (tmp)) > 0) {
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cpuclk = simple_strtoul (tmp, NULL, 10) * 1000000;
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cgu_init (cpuclk);
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ebu_init (cpuclk);
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sdram_init (cpuclk);
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}
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return 0;
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}
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