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https://github.com/AsahiLinux/u-boot
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73 lines
2.3 KiB
C
73 lines
2.3 KiB
C
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/*
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* (C) Copyright 2008
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* Texas Instruments, <www.ti.com>
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*
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* Richard Woodruff <r-woodruff2@ti.com>
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* Syed Mohammed Khasim <khasim@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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* 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/io.h>
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#include <asm/arch/mem.h>
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#include <asm/arch/clocks.h>
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#include <asm/arch/sys_proto.h>
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/************************************************************
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* sdelay() - simple spin loop. Will be constant time as
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* its generally used in bypass conditions only. This
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* is necessary until timers are accessible.
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*
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* not inline to increase chances its in cache when called
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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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* sr32 - clear & set a value in a bit range for a 32 bit address
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*****************************************************************/
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void sr32(void *addr, u32 start_bit, u32 num_bits, u32 value)
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{
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u32 tmp, msk = 0;
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msk = 1 << num_bits;
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--msk;
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tmp = readl((u32)addr) & ~(msk << start_bit);
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tmp |= value << start_bit;
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writel(tmp, (u32)addr);
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}
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/*********************************************************************
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* wait_on_value() - common routine to allow waiting for changes in
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* volatile regs.
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*********************************************************************/
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u32 wait_on_value(u32 read_bit_mask, u32 match_value, void *read_addr,
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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((u32)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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