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authorArnd Bergmann <arnd@arndb.de>2009-05-13 22:56:34 +0000
committerArnd Bergmann <arnd@klappe2.(none)>2009-06-11 21:02:42 +0200
commitae49e807951d5e26767bc55d1dc29671c596c450 (patch)
treefca4fedd8797c45b1f30299da49ebf3b5a982ec1 /include/asm-generic/timex.h
parentaafe4dbed0bf6cbdb2e9f03e1d42f8a540d8541d (diff)
asm-generic: add legacy I/O header files
The dma.h, hw_irq.h, serial.h and timex.h files originally described PC-style i8237, i8259A, i8250, i8253 and i8255 chips as well as the VGA style text mode graphics. Modern architectures live happily without these specific interfaces, but a few definitions from these headers keep getting used in common code. The new generic headers are what most architectures use anyway nowadays, just implementing the minimal definitions. Signed-off-by: Remis Lima Baima <remis.developer@googlemail.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'include/asm-generic/timex.h')
-rw-r--r--include/asm-generic/timex.h22
1 files changed, 22 insertions, 0 deletions
diff --git a/include/asm-generic/timex.h b/include/asm-generic/timex.h
new file mode 100644
index 000000000000..b2243cb8d6f6
--- /dev/null
+++ b/include/asm-generic/timex.h
@@ -0,0 +1,22 @@
+#ifndef __ASM_GENERIC_TIMEX_H
+#define __ASM_GENERIC_TIMEX_H
+
+/*
+ * If you have a cycle counter, return the value here.
+ */
+typedef unsigned long cycles_t;
+#ifndef get_cycles
+static inline cycles_t get_cycles(void)
+{
+ return 0;
+}
+#endif
+
+/*
+ * Architectures are encouraged to implement read_current_timer
+ * and define this in order to avoid the expensive delay loop
+ * calibration during boot.
+ */
+#undef ARCH_HAS_READ_CURRENT_TIMER
+
+#endif /* __ASM_GENERIC_TIMEX_H */