linux-kernel - [PATCH 1/2] Use common cpu_is_xxx() macros on AT91 and AVR32

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Date:	Mon,  7 May 2007 10:48:03 +0200
From:	Haavard Skinnemoen <hskinnemoen@...el.com>
To:	akpm@...ux-foundation.org
Cc:	David Brownell <david-b@...bell.net>,
	Andrew Victor <andrew@...people.com>,
	Nicolas Ferre <nicolas.ferre@....atmel.com>,
	linux-kernel@...r.kernel.org,
	Haavard Skinnemoen <hskinnemoen@...el.com>
Subject: [PATCH 1/2] Use common cpu_is_xxx() macros on AT91 and AVR32

Several drivers shared between AT91 and AVR32 chips use cpu_is_xxx()
to handle CPU-specific differences. Currently, such code needs to be
inside #ifdef CONFIG_ARCH_AT91 because the macros don't exist on AVR32.

By defining the same macros on both AT91 and AVR32, these #ifdefs can
be eliminated. Since the macros will evaluate to a constant value for
CPUs that aren't supported by the current architecture, any code that
is only needed on AT91 will be optimized away on AVR32 and vice versa.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@...el.com>
---
 include/asm-arm/arch-at91/cpu.h     |    6 ++++++
 include/asm-avr32/arch-at32ap/cpu.h |   33 +++++++++++++++++++++++++++++++++
 2 files changed, 39 insertions(+), 0 deletions(-)

diff --git a/include/asm-arm/arch-at91/cpu.h b/include/asm-arm/arch-at91/cpu.h
index d464ca5..7ef4eeb 100644
--- a/include/asm-arm/arch-at91/cpu.h
+++ b/include/asm-arm/arch-at91/cpu.h
@@ -68,4 +68,10 @@ static inline unsigned long at91_arch_identify(void)
 #define cpu_is_at91sam9263()	(0)
 #endif
 
+/*
+ * Since this is ARM, we will never run on any AVR32 CPU. But these
+ * definitions may reduce clutter in common drivers.
+ */
+#define cpu_is_at32ap7000()	(0)
+
 #endif
diff --git a/include/asm-avr32/arch-at32ap/cpu.h b/include/asm-avr32/arch-at32ap/cpu.h
new file mode 100644
index 0000000..2bdc5bd
--- /dev/null
+++ b/include/asm-avr32/arch-at32ap/cpu.h
@@ -0,0 +1,33 @@
+/*
+ * AVR32 and (fake) AT91 CPU identification
+ *
+ * Copyright (C) 2007 Atmel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef __ASM_ARCH_CPU_H
+#define __ASM_ARCH_CPU_H
+
+/*
+ * Only AT32AP7000 is defined for now. We can identify the specific
+ * chip at runtime, but I'm not sure if it's really worth it.
+ */
+#ifdef CONFIG_CPU_AT32AP7000
+# define cpu_is_at32ap7000()	(1)
+#else
+# define cpu_is_at32ap7000()	(0)
+#endif
+
+/*
+ * Since this is AVR32, we will never run on any AT91 CPU. But these
+ * definitions may reduce clutter in common drivers.
+ */
+#define cpu_is_at91rm9200()	(0)
+#define cpu_is_at91sam9xe()	(0)
+#define cpu_is_at91sam9260()	(0)
+#define cpu_is_at91sam9261()	(0)
+#define cpu_is_at91sam9263()	(0)
+
+#endif /* __ASM_ARCH_CPU_H */
-- 
1.4.4.4

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