mirror of
https://github.com/AsahiLinux/u-boot
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74 lines
2.2 KiB
C
74 lines
2.2 KiB
C
/*
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* (C) Copyright 2003
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* Josef Baumgartner <josef.baumgartner@telex.de>
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*
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* Copyright (C) 2004-2007 Freescale Semiconductor, Inc.
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* Hayden Fraser (Hayden.Fraser@freescale.com)
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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 <asm/processor.h>
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#include <asm/immap.h>
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DECLARE_GLOBAL_DATA_PTR;
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/*
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* get_clocks() fills in gd->cpu_clock and gd->bus_clk
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*/
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int get_clocks (void)
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{
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#if defined(CONFIG_M5249) || defined(CONFIG_M5253)
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volatile unsigned long cpll = mbar2_readLong(MCFSIM_PLLCR);
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unsigned long pllcr;
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#ifndef CFG_PLL_BYPASS
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#ifdef CONFIG_M5249
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/* Setup the PLL to run at the specified speed */
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#ifdef CFG_FAST_CLK
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pllcr = 0x925a3100; /* ~140MHz clock (PLL bypass = 0) */
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#else
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pllcr = 0x135a4140; /* ~72MHz clock (PLL bypass = 0) */
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#endif
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#endif /* CONFIG_M5249 */
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#ifdef CONFIG_M5253
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pllcr = CFG_PLLCR;
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#endif /* CONFIG_M5253 */
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cpll = cpll & 0xfffffffe; /* Set PLL bypass mode = 0 (PSTCLK = crystal) */
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mbar2_writeLong(MCFSIM_PLLCR, cpll); /* Set the PLL to bypass mode (PSTCLK = crystal) */
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mbar2_writeLong(MCFSIM_PLLCR, pllcr); /* set the clock speed */
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pllcr ^= 0x00000001; /* Set pll bypass to 1 */
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mbar2_writeLong(MCFSIM_PLLCR, pllcr); /* Start locking (pll bypass = 1) */
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udelay(0x20); /* Wait for a lock ... */
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#endif /* #ifndef CFG_PLL_BYPASS */
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#endif /* CONFIG_M5249 || CONFIG_M5253 */
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gd->cpu_clk = CFG_CLK;
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#if defined(CONFIG_M5249) || defined(CONFIG_M5253)
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gd->bus_clk = gd->cpu_clk / 2;
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#else
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gd->bus_clk = gd->cpu_clk;
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#endif
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return (0);
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}
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