mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-02 17:41:08 +00:00
8c454047fe
Let's use the more appropriate udelay for the nand_spl. While we can't make use of u-boot's full udelay we can atl east use a for loop that won't get optimized away .Since we have the bus clock we can use the timebase to calculate wall time. Looked at reusing the u-boot udelay functions but it pulls in a lot of code and would require quite a bit of work to keep us within the very small space constrains we currently have Signed-off-by: Matthew McClintock <msm@freescale.com> Signed-off-by: Andy Fleming <afleming@freescale.com>
40 lines
1.2 KiB
C
40 lines
1.2 KiB
C
/*
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* Copyright 2012 Freescale Semiconductor, Inc.
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* Author: Matthew McClintock <msm@freescale.com>
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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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*
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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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*/
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#include <common.h>
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#include <asm/processor.h>
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#include <asm/global_data.h>
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DECLARE_GLOBAL_DATA_PTR;
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#ifndef CONFIG_SYS_FSL_TBCLK_DIV
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#define CONFIG_SYS_FSL_TBCLK_DIV 8
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#endif
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void udelay(unsigned long usec)
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{
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u32 ticks_per_usec = gd->bus_clk / (CONFIG_SYS_FSL_TBCLK_DIV * 1000000);
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u32 ticks = ticks_per_usec * usec;
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u32 s = mfspr(SPRN_TBRL);
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while ((mfspr(SPRN_TBRL) - s) < ticks);
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}
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