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