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72 lines
2.1 KiB
C
72 lines
2.1 KiB
C
/*
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* Copyright (c) 2023, Artinchip Technology Co., Ltd
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef __AIC_IOPOLL_H__
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#define __AIC_IOPOLL_H__
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "aic_common.h"
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#include "aic_core.h"
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#define time_after(a,b) \
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((int)((b) - (a)) < 0)
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/**
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* read_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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* @sleep_us: Maximum time to sleep in us
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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 read_poll_timeout(op, addr, val, cond, sleep_us, timeout_us) \
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({ \
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u64 timeout = aic_get_time_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(aic_get_time_us(), timeout)) { \
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(val) = op(addr); \
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break; \
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} \
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if (sleep_us) \
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aic_udelay(sleep_us); \
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} \
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(cond) ? 0 : -ETIMEDOUT; \
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})
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#define readx_poll_sleep_timeout(op, addr, val, cond, sleep_us, timeout_us) \
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read_poll_timeout(op, addr, val, cond, sleep_us, timeout_us)
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#define readl_poll_sleep_timeout(addr, val, cond, sleep_us, timeout_us) \
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readx_poll_sleep_timeout(readl, addr, val, cond, sleep_us, timeout_us)
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#define readx_poll_timeout(op, addr, val, cond, timeout_us) \
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read_poll_timeout(op, addr, val, cond, false, timeout_us)
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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 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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#ifdef __cplusplus
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}
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#endif
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#endif /* __AIC_IOPOLL_H__ */
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