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69 lines
2.1 KiB
C
69 lines
2.1 KiB
C
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/*
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* Copyright (c) 2012-2014 The Linux Foundation. All rights reserved.
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*
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* SPDX-License-Identifier: GPL-2.0
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*/
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#ifndef _LINUX_IOPOLL_H
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#define _LINUX_IOPOLL_H
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#include <linux/errno.h>
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#include <linux/io.h>
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#include <time.h>
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/**
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* readx_poll_timeout - Periodically poll an address until a condition is met or a timeout occurs
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* @op: accessor function (takes @addr as its only argument)
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* @addr: Address to poll
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* @val: Variable to read the value into
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* @cond: Break condition (usually involving @val)
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* @timeout_us: Timeout in us, 0 means never timeout
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*
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* Returns 0 on success and -ETIMEDOUT upon a timeout. In either
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* case, the last read value at @addr is stored in @val.
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*
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* When available, you'll probably want to use one of the specialized
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* macros defined below rather than this macro directly.
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*/
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#define readx_poll_timeout(op, addr, val, cond, timeout_us) \
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({ \
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unsigned long timeout = timer_get_us() + timeout_us; \
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for (;;) { \
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(val) = op(addr); \
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if (cond) \
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break; \
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if (timeout_us && time_after(timer_get_us(), timeout)) { \
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(val) = op(addr); \
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break; \
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} \
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} \
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(cond) ? 0 : -ETIMEDOUT; \
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})
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#define readb_poll_timeout(addr, val, cond, timeout_us) \
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readx_poll_timeout(readb, addr, val, cond, timeout_us)
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#define readw_poll_timeout(addr, val, cond, timeout_us) \
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readx_poll_timeout(readw, addr, val, cond, timeout_us)
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#define readl_poll_timeout(addr, val, cond, timeout_us) \
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readx_poll_timeout(readl, addr, val, cond, timeout_us)
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#define readq_poll_timeout(addr, val, cond, timeout_us) \
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readx_poll_timeout(readq, addr, val, cond, timeout_us)
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#define readb_relaxed_poll_timeout(addr, val, cond, timeout_us) \
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readx_poll_timeout(readb_relaxed, addr, val, cond, timeout_us)
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#define readw_relaxed_poll_timeout(addr, val, cond, timeout_us) \
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readx_poll_timeout(readw_relaxed, addr, val, cond, timeout_us)
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#define readl_relaxed_poll_timeout(addr, val, cond, timeout_us) \
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readx_poll_timeout(readl_relaxed, addr, val, cond, timeout_us)
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#define readq_relaxed_poll_timeout(addr, val, cond, timeout_us) \
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readx_poll_timeout(readq_relaxed, addr, val, cond, timeout_us)
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#endif /* _LINUX_IOPOLL_H */
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