mirror of
https://github.com/AsahiLinux/u-boot
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130 lines
2.9 KiB
C
130 lines
2.9 KiB
C
/*
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* Copyright 2004 Freescale Semiconductor.
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* Jeff Brown
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* Srikanth Srinivasan (srikanth.srinivasan@freescale.com)
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*
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* (C) Copyright 2000-2002
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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 <mpc86xx.h>
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#include <asm/processor.h>
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DECLARE_GLOBAL_DATA_PTR;
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/* used in some defintiions of CONFIG_SYS_CLK_FREQ */
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extern unsigned long get_board_sys_clk(unsigned long dummy);
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void get_sys_info(sys_info_t *sysInfo)
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{
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volatile immap_t *immap = (immap_t *) CFG_IMMR;
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volatile ccsr_gur_t *gur = &immap->im_gur;
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uint plat_ratio, e600_ratio;
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plat_ratio = (gur->porpllsr) & 0x0000003e;
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plat_ratio >>= 1;
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switch (plat_ratio) {
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case 0x0:
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sysInfo->freqSystemBus = 16 * CONFIG_SYS_CLK_FREQ;
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break;
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case 0x02:
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case 0x03:
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case 0x04:
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case 0x05:
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case 0x06:
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case 0x08:
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case 0x09:
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case 0x0a:
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case 0x0c:
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case 0x10:
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sysInfo->freqSystemBus = plat_ratio * CONFIG_SYS_CLK_FREQ;
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break;
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default:
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sysInfo->freqSystemBus = 0;
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break;
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}
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e600_ratio = (gur->porpllsr) & 0x003f0000;
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e600_ratio >>= 16;
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switch (e600_ratio) {
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case 0x10:
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sysInfo->freqProcessor = 2 * sysInfo->freqSystemBus;
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break;
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case 0x19:
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sysInfo->freqProcessor = 5 * sysInfo->freqSystemBus / 2;
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break;
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case 0x20:
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sysInfo->freqProcessor = 3 * sysInfo->freqSystemBus;
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break;
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case 0x39:
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sysInfo->freqProcessor = 7 * sysInfo->freqSystemBus / 2;
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break;
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case 0x28:
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sysInfo->freqProcessor = 4 * sysInfo->freqSystemBus;
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break;
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case 0x1d:
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sysInfo->freqProcessor = 9 * sysInfo->freqSystemBus / 2;
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break;
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default:
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sysInfo->freqProcessor = e600_ratio + sysInfo->freqSystemBus;
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break;
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}
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}
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/*
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* Measure CPU clock speed (core clock GCLK1, GCLK2)
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* (Approx. GCLK frequency in Hz)
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*/
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int get_clocks(void)
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{
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sys_info_t sys_info;
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get_sys_info(&sys_info);
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gd->cpu_clk = sys_info.freqProcessor;
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gd->bus_clk = sys_info.freqSystemBus;
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if (gd->cpu_clk != 0)
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return 0;
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else
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return 1;
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}
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/*
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* get_bus_freq
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* Return system bus freq in Hz
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*/
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ulong get_bus_freq(ulong dummy)
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{
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ulong val;
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sys_info_t sys_info;
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get_sys_info(&sys_info);
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val = sys_info.freqSystemBus;
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return val;
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}
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