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/*
* (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 CFG_PLL_BYPASS
#ifdef CONFIG_M5249
/* Setup the PLL to run at the specified speed */
#ifdef CFG_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 = CFG_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 CFG_PLL_BYPASS */
#endif /* CONFIG_M5249 || CONFIG_M5253 */
gd->cpu_clk = CFG_CLK;
#if defined(CONFIG_M5249) || defined(CONFIG_M5253)
gd->bus_clk = gd->cpu_clk / 2;
#else
gd->bus_clk = gd->cpu_clk;
#endif
return (0);
}
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