/* SPDX-License-Identifier: GPL-2.0-or-later */#ifndef _ASM_POWERPC_DELAY_H#define _ASM_POWERPC_DELAY_H#ifdef __KERNEL__ #include <linux/processor.h>#include <asm/time.h> /* * Copyright 1996, Paul Mackerras. * Copyright (C) 2009 Freescale Semiconductor, Inc. All rights reserved. * * PPC64 Support added by Dave Engebretsen, Todd Inglett, Mike Corrigan, * Anton Blanchard. */ extern void __delay(unsigned long loops);extern void udelay(unsigned long usecs); /* * On shared processor machines the generic implementation of mdelay can * result in large errors. While each iteration of the loop inside mdelay * is supposed to take 1ms, the hypervisor could sleep our partition for * longer (eg 10ms). With the right timing these errors can add up. * * Since there is no 32bit overflow issue on 64bit kernels, just call * udelay directly. */#ifdef CONFIG_PPC64#define mdelay(n)	udelay((n) * 1000)#endif /** * spin_event_timeout - spin until a condition gets true or a timeout elapses * @condition: a C expression to evalate * @timeout: timeout, in microseconds * @delay: the number of microseconds to delay between each evaluation of *         @condition * * The process spins until the condition evaluates to true (non-zero) or the * timeout elapses.  The return value of this macro is the value of * @condition when the loop terminates. This allows you to determine the cause * of the loop terminates.  If the return value is zero, then you know a * timeout has occurred. * * This primary purpose of this macro is to poll on a hardware register * until a status bit changes.  The timeout ensures that the loop still * terminates even if the bit never changes.  The delay is for devices that * need a delay in between successive reads. * * gcc will optimize out the if-statement if @delay is a constant. */#define spin_event_timeout(condition, timeout, delay)                          \({                                                                             \	typeof(condition) __ret;                                               \	unsigned long __loops = tb_ticks_per_usec * timeout;                   \	unsigned long __start = mftb();                                     \                                                                               \	if (delay) {                                                           \		while (!(__ret = (condition)) &&                               \				(tb_ticks_since(__start) <= __loops))          \			udelay(delay);                                         \	} else {                                                               \		spin_begin();                                                  \		while (!(__ret = (condition)) &&                               \				(tb_ticks_since(__start) <= __loops))          \			spin_cpu_relax();                                      \		spin_end();                                                    \	}                                                                      \	if (!__ret)                                                            \		__ret = (condition);                                           \	__ret;		                                                       \}) #endif /* __KERNEL__ */#endif /* _ASM_POWERPC_DELAY_H */