/* * (C) Copyright 2003 * Josef Baumgartner <josef.baumgartner@telex.de> * * Copyright (C) 2004-2007 Freescale Semiconductor, Inc. * Hayden Fraser (Hayden.Fraser@freescale.com) * * 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 <asm/processor.h> #include <asm/immap.h> DECLARE_GLOBAL_DATA_PTR; /* * get_clocks() fills in gd->cpu_clock and gd->bus_clk */ int get_clocks (void) { #if defined(CONFIG_M5249) || defined(CONFIG_M5253) volatile unsigned long cpll = mbar2_readLong(MCFSIM_PLLCR); unsigned long pllcr; #ifndef CONFIG_SYS_PLL_BYPASS #ifdef CONFIG_M5249 /* Setup the PLL to run at the specified speed */ #ifdef CONFIG_SYS_FAST_CLK pllcr = 0x925a3100; /* ~140MHz clock (PLL bypass = 0) */ #else pllcr = 0x135a4140; /* ~72MHz clock (PLL bypass = 0) */ #endif #endif /* CONFIG_M5249 */ #ifdef CONFIG_M5253 pllcr = CONFIG_SYS_PLLCR; #endif /* CONFIG_M5253 */ cpll = cpll & 0xfffffffe; /* Set PLL bypass mode = 0 (PSTCLK = crystal) */ mbar2_writeLong(MCFSIM_PLLCR, cpll); /* Set the PLL to bypass mode (PSTCLK = crystal) */ mbar2_writeLong(MCFSIM_PLLCR, pllcr); /* set the clock speed */ pllcr ^= 0x00000001; /* Set pll bypass to 1 */ mbar2_writeLong(MCFSIM_PLLCR, pllcr); /* Start locking (pll bypass = 1) */ udelay(0x20); /* Wait for a lock ... */ #endif /* #ifndef CONFIG_SYS_PLL_BYPASS */ #endif /* CONFIG_M5249 || CONFIG_M5253 */ #if defined(CONFIG_M5275) volatile pll_t *pll = (volatile pll_t *)(MMAP_PLL); /* Setup PLL */ pll->syncr = 0x01080000; while (!(pll->synsr & FMPLL_SYNSR_LOCK)) ; pll->syncr = 0x01000000; while (!(pll->synsr & FMPLL_SYNSR_LOCK)) ; #endif gd->cpu_clk = CONFIG_SYS_CLK; #if defined(CONFIG_M5249) || defined(CONFIG_M5253) || \ defined(CONFIG_M5271) || defined(CONFIG_M5275) gd->bus_clk = gd->cpu_clk / 2; #else gd->bus_clk = gd->cpu_clk; #endif #ifdef CONFIG_FSL_I2C gd->i2c1_clk = gd->bus_clk; #ifdef CONFIG_SYS_I2C2_OFFSET gd->i2c2_clk = gd->bus_clk; #endif #endif return (0); }