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 <common.h> 11 #include <asm/io.h> 12 13 /************************************************************ 14 * sdelay() - simple spin loop. Will be constant time as 15 * its generally used in bypass conditions only. This 16 * is necessary until timers are accessible. 17 * 18 * not inline to increase chances its in cache when called 19 *************************************************************/ 20 void sdelay(unsigned long loops) 21 { 22 __asm__ volatile ("1:\n" "subs %0, %1, #1\n" 23 "bne 1b":"=r" (loops):"0"(loops)); 24 } 25 26 /********************************************************************* 27 * wait_on_value() - common routine to allow waiting for changes in 28 * volatile regs. 29 *********************************************************************/ 30 u32 wait_on_value(u32 read_bit_mask, u32 match_value, void *read_addr, 31 u32 bound) 32 { 33 u32 i = 0, val; 34 do { 35 ++i; 36 val = readl((u32)read_addr) & read_bit_mask; 37 if (val == match_value) 38 return 1; 39 if (i == bound) 40 return 0; 41 } while (1); 42 } 43