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