linux-kernel - [PATCH 04/27] asm-generic: add legacy I/O header files

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Message-Id: <10b3a32656e5552458db7412ef9ff8530d5f92aa.1241105648.git.arnd@arndb.de>
Date:	Thu, 6 Nov 2008 14:16:55 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	unlisted-recipients:; (no To-header on input)
Cc:	linux-arch@...r.kernel.org, Michal Simek <monstr@...str.eu>,
	Remis Lima Baima <remis.developer@...glemail.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 04/27] 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 and i8253 chips.
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: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Remis Lima Baima <remis.developer@...glemail.com>
---
 include/asm-generic/dma.h    |   15 +++++++++++++++
 include/asm-generic/hw_irq.h |    9 +++++++++
 include/asm-generic/serial.h |   13 +++++++++++++
 include/asm-generic/timex.h  |   29 +++++++++++++++++++++++++++++
 4 files changed, 66 insertions(+), 0 deletions(-)
 create mode 100644 include/asm-generic/dma.h
 create mode 100644 include/asm-generic/hw_irq.h
 create mode 100644 include/asm-generic/serial.h
 create mode 100644 include/asm-generic/timex.h

diff --git a/include/asm-generic/dma.h b/include/asm-generic/dma.h
new file mode 100644
index 0000000..9dfc3a7
--- /dev/null
+++ b/include/asm-generic/dma.h
@@ -0,0 +1,15 @@
+#ifndef __ASM_GENERIC_DMA_H
+#define __ASM_GENERIC_DMA_H
+/*
+ * This file traditionally describes the i8237 PC style DMA controller.
+ * Most architectures don't have these any more and can get the minimal
+ * implementation from kernel/dma.c by not defining MAX_DMA_CHANNELS.
+ *
+ * Some code relies on seeing MAX_DMA_ADDRESS though.
+ */
+#define MAX_DMA_ADDRESS PAGE_OFFSET
+
+extern int request_dma(unsigned int dmanr, const char *device_id);
+extern void free_dma(unsigned int dmanr);
+
+#endif /* __ASM_GENERIC_DMA_H */
diff --git a/include/asm-generic/hw_irq.h b/include/asm-generic/hw_irq.h
new file mode 100644
index 0000000..89036d7
--- /dev/null
+++ b/include/asm-generic/hw_irq.h
@@ -0,0 +1,9 @@
+#ifndef __ASM_GENERIC_HW_IRQ_H
+#define __ASM_GENERIC_HW_IRQ_H
+/*
+ * hw_irq.h has internal declarations for the low-level interrupt
+ * controller, like the original i8259A.
+ * In general, this is not needed for new architectures.
+ */
+
+#endif /* __ASM_GENERIC_HW_IRQ_H */
diff --git a/include/asm-generic/serial.h b/include/asm-generic/serial.h
new file mode 100644
index 0000000..5e29109
--- /dev/null
+++ b/include/asm-generic/serial.h
@@ -0,0 +1,13 @@
+#ifndef __ASM_GENERIC_SERIAL_H
+#define __ASM_GENERIC_SERIAL_H
+
+/*
+ * This should not be an architecture specific #define, oh well.
+ *
+ * Traditionally, it just describes i8250 and related serial ports
+ * that have this clock rate.
+ */
+
+#define BASE_BAUD (1843200 / 16)
+
+#endif /* __ASM_GENERIC_SERIAL_H */
diff --git a/include/asm-generic/timex.h b/include/asm-generic/timex.h
new file mode 100644
index 0000000..8a8d4a0
--- /dev/null
+++ b/include/asm-generic/timex.h
@@ -0,0 +1,29 @@
+#ifndef __ASM_GENERIC_TIMEX_H
+#define __ASM_GENERIC_TIMEX_H
+
+/*
+ * CLOCK_TICK_RATE is highly PC-specific and should not
+ * be used in portable code. 1193182 is the value for the
+ * original i8253 PIC.
+ */
+#ifndef CLOCK_TICK_RATE
+#define CLOCK_TICK_RATE		1193182
+#endif
+
+/*
+ * If you have a cycle counter, return the value here.
+ */
+typedef unsigned long cycles_t;
+static inline cycles_t get_cycles(void)
+{
+	return 0;
+}
+
+/*
+ * 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 */
-- 
1.5.6.3


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