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https://github.com/AsahiLinux/u-boot
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7cb22f97ee
environment variable which can set to "100", "133", or "150". The CPU clock will be configured accordingly upon next reboot. Other values are ignored. In case of an invalid or undefined "cpuclk" value, the compile-time default CPU clock speed will be used. * Enable Quad-UART on BMS2003 board (initialize the PCMCIA memory window that is used to access the UART registers by the Linux driver) * Patch by Reinhard Meyer, 20 Dec 2003: Fix clock calculation for the MPC5200 for higher clock frequencies (above 2**32 / 10 = 429.5 MHz).
119 lines
3.3 KiB
C
119 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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* 130.000.000. for 130 Mhz
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* 100.000.000. for 100 Mhz
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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) & INCA_IP_CGU_CGU_MUXCR_MUXI)
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{
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/* MUX I set to 150 MHz clock */
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return 150000000;
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}
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else
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{
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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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{
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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 130000000;
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}
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else
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{
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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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{
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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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uchar tmp[64];
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ulong cpuclk;
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if (getenv_r("cpuclk", tmp, sizeof(tmp)) > 0)
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{
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cpuclk = simple_strtoul(tmp, NULL, 10) * 1000000;
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ebu_init(cpuclk);
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cgu_init(cpuclk);
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}
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return 0;
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}
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