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/**
* @file
* @brief Provide OMAP independent utility APIs
*
* FileName: arch/arm/mach-omap/syslib.c
*
* Provide APIs which can be used from platform/architecture code
* to operate on
*
* Originally from http://linux.omap.com/pub/bootloader/3430sdp/barebox-v1.tar.gz
*/
/*
* (C) Copyright 2006-2008
* Texas Instruments, <www.ti.com>
* Richard Woodruff <r-woodruff2@ti.com>
*
* 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 <config.h>
#include <common.h>
#include <asm/io.h>
#include <mach/syslib.h>
/**
* @brief simple spin loop
*
* Will be constant time as its generally used in bypass conditions only.
* This is necessary until timers are accessible. if you need timed delays
* use @ref mdelay or @ref udelay instead
*
* @param[in] loops number of loops
*
* @return void
*/
void sdelay(unsigned long loops)
{
__asm__ volatile ("1:\n" "subs %0, %1, #1\n"
"bne 1b":"=r" (loops):"0"(loops));
}
/**
* @brief clear & set a value in a bit range for a 32 bit address
*
* @param[in] addr Address to set/read from
* @param[in] start_bit Where to put the value
* @param[in] num_bits number of bits the value should be set
* @param[in] value the value to set
*
* @return void
*/
void sr32(u32 addr, u32 start_bit, u32 num_bits, u32 value)
{
u32 tmp, msk = 0;
msk = 1 << num_bits;
--msk;
tmp = readl(addr) & ~(msk << start_bit);
tmp |= value << start_bit;
writel(tmp, addr);
}
/**
* @brief common routine to allow waiting for changes in volatile regs.
*
* @param[in] read_bit_mask the bit mask to read
* @param[in] match_value match to which value
* @param[in] read_addr address to read from
* @param[in] bound max iterations
*
* @return 1 if match_value is found, else if bound iterations reached,
* returns 0
*/
u32 wait_on_value(u32 read_bit_mask, u32 match_value, u32 read_addr, u32 bound)
{
u32 i = 0, val;
do {
++i;
val = readl(read_addr) & read_bit_mask;
if (val == match_value)
return 1;
if (i == bound)
return 0;
} while (1);
}
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