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