/* * Copyright 2004 Freescale Semiconductor. * Jeff Brown * Srikanth Srinivasan (srikanth.srinivasan@freescale.com) * * (C) Copyright 2000-2002 * 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 <mpc86xx.h> #include <asm/processor.h> #include <asm/io.h> DECLARE_GLOBAL_DATA_PTR; /* used in some defintiions of CONFIG_SYS_CLK_FREQ */ extern unsigned long get_board_sys_clk(unsigned long dummy); void get_sys_info(sys_info_t *sysInfo) { volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR; volatile ccsr_gur_t *gur = &immap->im_gur; uint plat_ratio, e600_ratio; uint lcrr_div; plat_ratio = (gur->porpllsr) & 0x0000003e; plat_ratio >>= 1; switch (plat_ratio) { case 0x0: sysInfo->freqSystemBus = 16 * CONFIG_SYS_CLK_FREQ; break; case 0x02: case 0x03: case 0x04: case 0x05: case 0x06: case 0x08: case 0x09: case 0x0a: case 0x0c: case 0x10: sysInfo->freqSystemBus = plat_ratio * CONFIG_SYS_CLK_FREQ; break; default: sysInfo->freqSystemBus = 0; break; } e600_ratio = (gur->porpllsr) & 0x003f0000; e600_ratio >>= 16; switch (e600_ratio) { case 0x10: sysInfo->freqProcessor = 2 * sysInfo->freqSystemBus; break; case 0x19: sysInfo->freqProcessor = 5 * sysInfo->freqSystemBus / 2; break; case 0x20: sysInfo->freqProcessor = 3 * sysInfo->freqSystemBus; break; case 0x39: sysInfo->freqProcessor = 7 * sysInfo->freqSystemBus / 2; break; case 0x28: sysInfo->freqProcessor = 4 * sysInfo->freqSystemBus; break; case 0x1d: sysInfo->freqProcessor = 9 * sysInfo->freqSystemBus / 2; break; default: sysInfo->freqProcessor = e600_ratio + sysInfo->freqSystemBus; break; } #if defined(CONFIG_SYS_LBC_LCRR) /* We will program LCRR to this value later */ lcrr_div = CONFIG_SYS_LBC_LCRR & LCRR_CLKDIV; #else { volatile ccsr_lbc_t *lbc = &immap->im_lbc; lcrr_div = in_be32(&lbc->lcrr) & LCRR_CLKDIV; } #endif if (lcrr_div == 2 || lcrr_div == 4 || lcrr_div == 8) { sysInfo->freqLocalBus = sysInfo->freqSystemBus / (lcrr_div * 2); } else { /* In case anyone cares what the unknown value is */ sysInfo->freqLocalBus = lcrr_div; } } /* * Measure CPU clock speed (core clock GCLK1, GCLK2) * (Approx. GCLK frequency in Hz) */ int get_clocks(void) { sys_info_t sys_info; get_sys_info(&sys_info); gd->cpu_clk = sys_info.freqProcessor; gd->bus_clk = sys_info.freqSystemBus; gd->lbc_clk = sys_info.freqLocalBus; /* * The base clock for I2C depends on the actual SOC. Unfortunately, * there is no pattern that can be used to determine the frequency, so * the only choice is to look up the actual SOC number and use the value * for that SOC. This information is taken from application note * AN2919. */ #ifdef CONFIG_MPC8610 gd->i2c1_clk = sys_info.freqSystemBus; #else gd->i2c1_clk = sys_info.freqSystemBus / 2; #endif gd->i2c2_clk = gd->i2c1_clk; if (gd->cpu_clk != 0) return 0; else return 1; } /* * get_bus_freq * Return system bus freq in Hz */ ulong get_bus_freq(ulong dummy) { ulong val; sys_info_t sys_info; get_sys_info(&sys_info); val = sys_info.freqSystemBus; return val; }