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ada591d2a0
Currently MPC85xx and MPC86xx boards just calculate the localbus frequency and print it out, but don't save it. This changes where its calculated and stored to be more consistent with the CPU, CCB, TB, and DDR frequencies and the MPC83xx localbus clock. The localbus frequency is added to sysinfo and calculated when sysinfo is set up, in cpu/mpc8[56]xx/speed.c, the same as the other frequencies are. get_clocks() copies the frequency into the global data, as the other frequencies are, into a new field that is only enabled for MPC85xx and MPC86xx. checkcpu() in cpu/mpc8[56]xx/cpu.c will print out the local bus frequency from sysinfo, like the other frequencies, instead of calculating it on the spot. Signed-off-by: Trent Piepho <tpiepho@freescale.com> Acked-by: Kumar Gala <galak@kernel.crashing.org> Acked-by: Jon Loeliger <jdl@freescale.com>
163 lines
3.8 KiB
C
163 lines
3.8 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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#include <asm/io.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 *) CONFIG_SYS_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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uint lcrr_div;
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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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#if defined(CONFIG_SYS_LBC_LCRR)
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/* We will program LCRR to this value later */
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lcrr_div = CONFIG_SYS_LBC_LCRR & LCRR_CLKDIV;
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#else
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{
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volatile ccsr_lbc_t *lbc = &immap->im_lbc;
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lcrr_div = in_be32(&lbc->lcrr) & LCRR_CLKDIV;
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}
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#endif
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if (lcrr_div == 2 || lcrr_div == 4 || lcrr_div == 8) {
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sysInfo->freqLocalBus = sysInfo->freqSystemBus / (lcrr_div * 2);
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} else {
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/* In case anyone cares what the unknown value is */
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sysInfo->freqLocalBus = lcrr_div;
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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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gd->lbc_clk = sys_info.freqLocalBus;
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/*
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* The base clock for I2C depends on the actual SOC. Unfortunately,
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* there is no pattern that can be used to determine the frequency, so
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* the only choice is to look up the actual SOC number and use the value
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* for that SOC. This information is taken from application note
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* AN2919.
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*/
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#ifdef CONFIG_MPC8610
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gd->i2c1_clk = sys_info.freqSystemBus;
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#else
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gd->i2c1_clk = sys_info.freqSystemBus / 2;
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#endif
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gd->i2c2_clk = gd->i2c1_clk;
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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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