98 lines
2.7 KiB
C
98 lines
2.7 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_DELAY_H
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#define _LINUX_DELAY_H
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/*
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* Copyright (C) 1993 Linus Torvalds
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*
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* Delay routines, using a pre-computed "loops_per_jiffy" value.
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*
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* Please note that ndelay(), udelay() and mdelay() may return early for
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* several reasons:
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* 1. computed loops_per_jiffy too low (due to the time taken to
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* execute the timer interrupt.)
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* 2. cache behaviour affecting the time it takes to execute the
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* loop function.
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* 3. CPU clock rate changes.
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*
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* Please see this thread:
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* http://lists.openwall.net/linux-kernel/2011/01/09/56
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*/
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#include <linux/kernel.h>
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extern unsigned long loops_per_jiffy;
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#include <asm/delay.h>
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/*
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* Using udelay() for intervals greater than a few milliseconds can
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* risk overflow for high loops_per_jiffy (high bogomips) machines. The
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* mdelay() provides a wrapper to prevent this. For delays greater
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* than MAX_UDELAY_MS milliseconds, the wrapper is used. Architecture
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* specific values can be defined in asm-???/delay.h as an override.
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* The 2nd mdelay() definition ensures GCC will optimize away the
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* while loop for the common cases where n <= MAX_UDELAY_MS -- Paul G.
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*/
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#ifndef MAX_UDELAY_MS
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#define MAX_UDELAY_MS 5
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#endif
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#define MAX_MDELAY 1000
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#if defined(CONFIG_SEC_DEBUG_SUMMARY) && !defined(CONFIG_SAMSUNG_PRODUCT_SHIP)
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extern unsigned long sec_delay_check;
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#define BUG_MDELAY_LOG(irq, atomic) if (unlikely(irq) || unlikely(atomic)) { \
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if (irq) \
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pr_err("BUG: mdelay called @ IRQ disabled context\n"); \
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if (atomic) \
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pr_err("BUG: mdelay called @ non-Atomic context\n"); \
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}
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#endif
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#ifndef mdelay
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#if !defined(CONFIG_SEC_DEBUG_SUMMARY) || defined(CONFIG_SAMSUNG_PRODUCT_SHIP)
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#define mdelay(n) (\
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(__builtin_constant_p(n) && (n)<=MAX_UDELAY_MS) ? udelay((n)*1000) : \
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({unsigned long __ms=(n); while (__ms--) udelay(1000);}))
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#else
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#define mdelay(n) ({\
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BUILD_BUG_ON(__builtin_constant_p(n) && (n) > MAX_MDELAY); \
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if (__builtin_constant_p(n) && (n) <= MAX_UDELAY_MS) \
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udelay((n) * 1000); \
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else {\
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unsigned long __ms = (n); \
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bool irq_cond = irqs_disabled();\
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bool atomic_cond = !in_atomic();\
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BUG_MDELAY_LOG(irq_cond, atomic_cond);\
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BUG_ON((irq_cond || atomic_cond) && sec_delay_check);\
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while (__ms--) \
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udelay(1000); \
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} \
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})
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#endif
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#endif
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#ifndef ndelay
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static inline void ndelay(unsigned long x)
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{
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udelay(DIV_ROUND_UP(x, 1000));
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}
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#define ndelay(x) ndelay(x)
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#endif
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extern unsigned long lpj_fine;
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void calibrate_delay(void);
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void msleep(unsigned int msecs);
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unsigned long msleep_interruptible(unsigned int msecs);
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void usleep_range(unsigned long min, unsigned long max);
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static inline void ssleep(unsigned int seconds)
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{
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msleep(seconds * 1000);
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}
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#endif /* defined(_LINUX_DELAY_H) */
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