c7f45d762d
In addition, collapse adjacent comment blocks into one and remove extraneous blank lines. Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca> Acked-by: Nishanth Menon <nm@ti.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
71 lines
1.9 KiB
C
71 lines
1.9 KiB
C
/**
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* @file
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* @brief Provide OMAP independent utility APIs
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*
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* Provide APIs which can be used from platform/architecture code
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* to operate on
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*
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* Originally from http://linux.omap.com/pub/bootloader/3430sdp/u-boot-v1.tar.gz
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*
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* (C) Copyright 2006-2008
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* Texas Instruments, <www.ti.com>
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* Richard Woodruff <r-woodruff2@ti.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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* GNU General Public License for more details.
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*/
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#include <config.h>
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#include <common.h>
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#include <io.h>
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#include <mach/syslib.h>
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/**
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* @brief simple spin loop
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*
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* Will be constant time as its generally used in bypass conditions only.
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* This is necessary until timers are accessible. if you need timed delays
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* use @ref mdelay or @ref udelay instead
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*
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* @param[in] loops number of loops
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*
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* @return void
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*/
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void sdelay(unsigned long loops)
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{
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__asm__ volatile ("1:\n" "subs %0, %1, #1\n"
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"bne 1b":"=r" (loops):"0"(loops));
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}
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/**
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* @brief common routine to allow waiting for changes in volatile regs.
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*
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* @param[in] read_bit_mask the bit mask to read
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* @param[in] match_value match to which value
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* @param[in] read_addr address to read from
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* @param[in] bound max iterations
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*
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* @return 1 if match_value is found, else if bound iterations reached,
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* returns 0
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*/
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u32 wait_on_value(u32 read_bit_mask, u32 match_value, u32 read_addr, u32 bound)
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{
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u32 i = 0, val;
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do {
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++i;
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val = readl(read_addr) & read_bit_mask;
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if (val == match_value)
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return 1;
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if (i == bound)
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return 0;
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} while (1);
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}
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