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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /include/linux/delay.h
Initial import
Diffstat (limited to 'include/linux/delay.h')
-rw-r--r--include/linux/delay.h55
1 files changed, 55 insertions, 0 deletions
diff --git a/include/linux/delay.h b/include/linux/delay.h
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index 000000000..a6ecb34cf
--- /dev/null
+++ b/include/linux/delay.h
@@ -0,0 +1,55 @@
+#ifndef _LINUX_DELAY_H
+#define _LINUX_DELAY_H
+
+/*
+ * Copyright (C) 1993 Linus Torvalds
+ *
+ * Delay routines, using a pre-computed "loops_per_jiffy" value.
+ */
+
+#include <linux/kernel.h>
+
+extern unsigned long loops_per_jiffy;
+
+#include <asm/delay.h>
+
+/*
+ * Using udelay() for intervals greater than a few milliseconds can
+ * risk overflow for high loops_per_jiffy (high bogomips) machines. The
+ * mdelay() provides a wrapper to prevent this. For delays greater
+ * than MAX_UDELAY_MS milliseconds, the wrapper is used. Architecture
+ * specific values can be defined in asm-???/delay.h as an override.
+ * The 2nd mdelay() definition ensures GCC will optimize away the
+ * while loop for the common cases where n <= MAX_UDELAY_MS -- Paul G.
+ */
+
+#ifndef MAX_UDELAY_MS
+#define MAX_UDELAY_MS 5
+#endif
+
+#ifndef mdelay
+#define mdelay(n) (\
+ (__builtin_constant_p(n) && (n)<=MAX_UDELAY_MS) ? udelay((n)*1000) : \
+ ({unsigned long __ms=(n); while (__ms--) udelay(1000);}))
+#endif
+
+#ifndef ndelay
+static inline void ndelay(unsigned long x)
+{
+ udelay(DIV_ROUND_UP(x, 1000));
+}
+#define ndelay(x) ndelay(x)
+#endif
+
+extern unsigned long lpj_fine;
+void calibrate_delay(void);
+void msleep(unsigned int msecs);
+unsigned long msleep_interruptible(unsigned int msecs);
+void usleep_range(unsigned long min, unsigned long max);
+
+static inline void ssleep(unsigned int seconds)
+{
+ msleep(seconds * 1000);
+}
+
+#endif /* defined(_LINUX_DELAY_H) */