| // SPDX-License-Identifier: GPL-2.0+ | |
| /* | |
| * (C) Copyright 2008 | |
| * Texas Instruments, <www.ti.com> | |
| * | |
| * Richard Woodruff <r-woodruff2@ti.com> | |
| * Syed Mohammed Khasim <khasim@ti.com> | |
| */ | |
| #include <asm/io.h> | |
| /************************************************************ | |
| * sdelay() - simple spin loop. Will be constant time as | |
| * its generally used in bypass conditions only. This | |
| * is necessary until timers are accessible. | |
| * | |
| * not inline to increase chances its in cache when called | |
| *************************************************************/ | |
| void sdelay(unsigned long loops) | |
| { | |
| __asm__ volatile ("1:\n" "subs %0, %1, #1\n" | |
| "bne 1b":"=r" (loops):"0"(loops)); | |
| } | |
| /********************************************************************* | |
| * wait_on_value() - common routine to allow waiting for changes in | |
| * volatile regs. | |
| *********************************************************************/ | |
| u32 wait_on_value(u32 read_bit_mask, u32 match_value, void *read_addr, | |
| u32 bound) | |
| { | |
| u32 i = 0, val; | |
| do { | |
| ++i; | |
| val = readl((u32)read_addr) & read_bit_mask; | |
| if (val == match_value) | |
| return 1; | |
| if (i == bound) | |
| return 0; | |
| } while (1); | |
| } |