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include/wait_bit.h
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/* * Wait for bit with timeout and ctrlc * * (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com> * * SPDX-License-Identifier: GPL-2.0+ */ #ifndef __WAIT_BIT_H #define __WAIT_BIT_H #include <common.h> #include <console.h> |
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#include <linux/errno.h> |
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#include <asm/io.h> /** * wait_for_bit() waits for bit set/cleared in register * * Function polls register waiting for specific bit(s) change * (either 0->1 or 1->0). It can fail under two conditions: * - Timeout * - User interaction (CTRL-C) * Function succeeds only if all bits of masked register are set/cleared * (depending on set option). * * @param prefix Prefix added to timeout messagge (message visible only * with debug enabled) * @param reg Register that will be read (using readl()) * @param mask Bit(s) of register that must be active * @param set Selects wait condition (bit set or clear) * @param timeout_ms Timeout (in miliseconds) * @param breakable Enables CTRL-C interruption * @return 0 on success, -ETIMEDOUT or -EINTR on failure */ static inline int wait_for_bit(const char *prefix, const u32 *reg, const u32 mask, const bool set, const unsigned int timeout_ms, const bool breakable) { u32 val; unsigned long start = get_timer(0); while (1) { val = readl(reg); if (!set) val = ~val; if ((val & mask) == mask) return 0; if (get_timer(start) > timeout_ms) break; if (breakable && ctrlc()) { puts("Abort "); return -EINTR; } udelay(1); } debug("%s: Timeout (reg=%p mask=%08x wait_set=%i) ", prefix, reg, mask, set); return -ETIMEDOUT; } #endif |