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 *************************************************************/ 21 void 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 *********************************************************************/ 31 u32 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