mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-27 15:12:21 +00:00
ce786ae391
Add readl poll API with sleep and timeout support.
This change is referenced from Linux from below commit:
commit <5f5323a14cad19323060a8cbf9d96f2280a462dd> ("iopoll:
introduce read_poll_timeout macro")
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
79 lines
2.6 KiB
C
79 lines
2.6 KiB
C
/* 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/delay.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/io.h>
|
|
#include <time.h>
|
|
|
|
/**
|
|
* read_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)
|
|
* @sleep_us: Maximum time to sleep in us
|
|
* @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 read_poll_timeout(op, addr, val, cond, sleep_us, 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; \
|
|
} \
|
|
if (sleep_us) \
|
|
udelay(sleep_us); \
|
|
} \
|
|
(cond) ? 0 : -ETIMEDOUT; \
|
|
})
|
|
|
|
#define readx_poll_sleep_timeout(op, addr, val, cond, sleep_us, timeout_us) \
|
|
read_poll_timeout(op, addr, val, cond, sleep_us, timeout_us)
|
|
|
|
#define readl_poll_sleep_timeout(addr, val, cond, sleep_us, timeout_us) \
|
|
readx_poll_sleep_timeout(readl, addr, val, cond, sleep_us, timeout_us)
|
|
|
|
#define readx_poll_timeout(op, addr, val, cond, timeout_us) \
|
|
read_poll_timeout(op, addr, val, cond, false, timeout_us)
|
|
|
|
#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 */
|