LXR uboot/arch/arm/cpu/armv7/syslib.c

   1/*
   2 * (C) Copyright 2008
   3 * Texas Instruments, <www.ti.com>
   4 *
   5 * Richard Woodruff <r-woodruff2@ti.com>
   6 * Syed Mohammed Khasim <khasim@ti.com>
   7 *
   8 * SPDX-License-Identifier:     GPL-2.0+
   9 */
  10
  11#include <common.h>
  12#include <asm/io.h>
  13
  14/************************************************************
  15 * sdelay() - simple spin loop.  Will be constant time as
  16 *  its generally used in bypass conditions only.  This
  17 *  is necessary until timers are accessible.
  18 *
  19 *  not inline to increase chances its in cache when called
  20 *************************************************************/
  21void sdelay(unsigned long loops)
  22{
  23        __asm__ volatile ("1:\n" "subs %0, %1, #1\n"
  24                          "bne 1b":"=r" (loops):"0"(loops));
  25}
  26
  27/*********************************************************************
  28 * wait_on_value() - common routine to allow waiting for changes in
  29 *   volatile regs.
  30 *********************************************************************/
  31u32 wait_on_value(u32 read_bit_mask, u32 match_value, void *read_addr,
  32                  u32 bound)
  33{
  34        u32 i = 0, val;
  35        do {
  36                ++i;
  37                val = readl((u32)read_addr) & read_bit_mask;
  38                if (val == match_value)
  39                        return 1;
  40                if (i == bound)
  41                        return 0;
  42        } while (1);
  43}
  44