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/*
* PLL setup for Cirrus edb93xx boards
*
* Copyright (C) 2009 Matthias Kaehlcke <matthias@kaehlcke.net>
*
* Copyright (C) 2006 Dominic Rath <Dominic.Rath@gmx.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.
*
*/
#include <common.h>
#include <io.h>
#include "pll_cfg.h"
#include "early_udelay.h"
void pll_cfg(void)
{
struct syscon_regs *syscon = (struct syscon_regs *)SYSCON_BASE;
/* setup PLL1 */
writel(CLKSET1_VAL, &syscon->clkset1);
/*
* flush the pipeline
* writing to CLKSET1 causes the EP93xx to enter standby for between
* 8 ms to 16 ms, until PLL1 stabilizes
*/
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
/* setup PLL2 */
writel(CLKSET2_VAL, &syscon->clkset2);
/*
* the user's guide recommends to wait at least 1 ms for PLL2 to
* stabilize
*/
early_udelay(1000);
}
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