mirror of
https://github.com/brain-hackers/u-boot-brain
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83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
68 lines
2.1 KiB
C
68 lines
2.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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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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#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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