[PATCH] avr32 architecture

This adds support for the Atmel AVR32 architecture as well as the AT32AP7000
CPU and the AT32STK1000 development board.

AVR32 is a new high-performance 32-bit RISC microprocessor core, designed for
cost-sensitive embedded applications, with particular emphasis on low power
consumption and high code density.  The AVR32 architecture is not binary
compatible with earlier 8-bit AVR architectures.

The AVR32 architecture, including the instruction set, is described by the
AVR32 Architecture Manual, available from

http://www.atmel.com/dyn/resources/prod_documents/doc32000.pdf

The Atmel AT32AP7000 is the first CPU implementing the AVR32 architecture.  It
features a 7-stage pipeline, 16KB instruction and data caches and a full
Memory Management Unit.  It also comes with a large set of integrated
peripherals, many of which are shared with the AT91 ARM-based controllers from
Atmel.

Full data sheet is available from

http://www.atmel.com/dyn/resources/prod_documents/doc32003.pdf

while the CPU core implementation including caches and MMU is documented by
the AVR32 AP Technical Reference, available from

http://www.atmel.com/dyn/resources/prod_documents/doc32001.pdf

Information about the AT32STK1000 development board can be found at

http://www.atmel.com/dyn/products/tools_card.asp?tool_id=3918

including a BSP CD image with an earlier version of this patch, development
tools (binaries and source/patches) and a root filesystem image suitable for
booting from SD card.

Alternatively, there's a preliminary "getting started" guide available at
http://avr32linux.org/twiki/bin/view/Main/GettingStarted which provides links
to the sources and patches you will need in order to set up a cross-compiling
environment for avr32-linux.

This patch, as well as the other patches included with the BSP and the
toolchain patches, is actively supported by Atmel Corporation.

[dmccr@us.ibm.com: Fix more pxx_page macro locations]
[bunk@stusta.de: fix `make defconfig']
Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Dave McCracken <dmccr@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 155 insertions, 0 deletions

diff --git a/include/asm-avr32/system.h b/include/asm-avr32/system.h
new file mode 100644
index 00000000000..ac596058697
--- /dev/null
+++ b/include/asm-avr32/system.h
@@ -0,0 +1,155 @@
+/*
+ * Copyright (C) 2004-2006 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_AVR32_SYSTEM_H
+#define __ASM_AVR32_SYSTEM_H
+
+#include <linux/compiler.h>
+#include <linux/types.h>
+
+#include <asm/ptrace.h>
+#include <asm/sysreg.h>
+
+#define xchg(ptr,x) \
+	((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
+
+#define nop() asm volatile("nop")
+
+#define mb()			asm volatile("" : : : "memory")
+#define rmb()			mb()
+#define wmb()			asm volatile("sync 0" : : : "memory")
+#define read_barrier_depends()  do { } while(0)
+#define set_mb(var, value)      do { var = value; mb(); } while(0)
+
+/*
+ * Help PathFinder and other Nexus-compliant debuggers keep track of
+ * the current PID by emitting an Ownership Trace Message each time we
+ * switch task.
+ */
+#ifdef CONFIG_OWNERSHIP_TRACE
+#include <asm/ocd.h>
+#define finish_arch_switch(prev)			\
+	do {						\
+		__mtdr(DBGREG_PID, prev->pid);		\
+		__mtdr(DBGREG_PID, current->pid);	\
+	} while(0)
+#endif
+
+/*
+ * switch_to(prev, next, last) should switch from task `prev' to task
+ * `next'. `prev' will never be the same as `next'.
+ *
+ * We just delegate everything to the __switch_to assembly function,
+ * which is implemented in arch/avr32/kernel/switch_to.S
+ *
+ * mb() tells GCC not to cache `current' across this call.
+ */
+struct cpu_context;
+struct task_struct;
+extern struct task_struct *__switch_to(struct task_struct *,
+				       struct cpu_context *,
+				       struct cpu_context *);
+#define switch_to(prev, next, last)					\
+	do {								\
+		last = __switch_to(prev, &prev->thread.cpu_context + 1,	\
+				   &next->thread.cpu_context);		\
+	} while (0)
+
+#ifdef CONFIG_SMP
+# error "The AVR32 port does not support SMP"
+#else
+# define smp_mb()		barrier()
+# define smp_rmb()		barrier()
+# define smp_wmb()		barrier()
+# define smp_read_barrier_depends() do { } while(0)
+#endif
+
+#include <linux/irqflags.h>
+
+extern void __xchg_called_with_bad_pointer(void);
+
+#ifdef __CHECKER__
+extern unsigned long __builtin_xchg(void *ptr, unsigned long x);
+#endif
+
+#define xchg_u32(val, m) __builtin_xchg((void *)m, val)
+
+static inline unsigned long __xchg(unsigned long x,
+				       volatile void *ptr,
+				       int size)
+{
+	switch(size) {
+	case 4:
+		return xchg_u32(x, ptr);
+	default:
+		__xchg_called_with_bad_pointer();
+		return x;
+	}
+}
+
+static inline unsigned long __cmpxchg_u32(volatile int *m, unsigned long old,
+					  unsigned long new)
+{
+	__u32 ret;
+
+	asm volatile(
+		"1:	ssrf	5\n"
+		"	ld.w	%[ret], %[m]\n"
+		"	cp.w	%[ret], %[old]\n"
+		"	brne	2f\n"
+		"	stcond	%[m], %[new]\n"
+		"	brne	1b\n"
+		"2:\n"
+		: [ret] "=&r"(ret), [m] "=m"(*m)
+		: "m"(m), [old] "ir"(old), [new] "r"(new)
+		: "memory", "cc");
+	return ret;
+}
+
+extern unsigned long __cmpxchg_u64_unsupported_on_32bit_kernels(
+        volatile int * m, unsigned long old, unsigned long new);
+#define __cmpxchg_u64 __cmpxchg_u64_unsupported_on_32bit_kernels
+
+/* This function doesn't exist, so you'll get a linker error
+   if something tries to do an invalid cmpxchg().  */
+extern void __cmpxchg_called_with_bad_pointer(void);
+
+#define __HAVE_ARCH_CMPXCHG 1
+
+static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old,
+				      unsigned long new, int size)
+{
+	switch (size) {
+	case 4:
+		return __cmpxchg_u32(ptr, old, new);
+	case 8:
+		return __cmpxchg_u64(ptr, old, new);
+	}
+
+	__cmpxchg_called_with_bad_pointer();
+	return old;
+}
+
+#define cmpxchg(ptr, old, new)					\
+	((typeof(*(ptr)))__cmpxchg((ptr), (unsigned long)(old),	\
+				   (unsigned long)(new),	\
+				   sizeof(*(ptr))))
+
+struct pt_regs;
+extern void __die(const char *, struct pt_regs *, unsigned long,
+		  const char *, const char *, unsigned long);
+extern void __die_if_kernel(const char *, struct pt_regs *, unsigned long,
+			    const char *, const char *, unsigned long);
+
+#define die(msg, regs, err)					\
+	__die(msg, regs, err, __FILE__ ":", __FUNCTION__, __LINE__)
+#define die_if_kernel(msg, regs, err)					\
+	__die_if_kernel(msg, regs, err, __FILE__ ":", __FUNCTION__, __LINE__)
+
+#define arch_align_stack(x)	(x)
+
+#endif /* __ASM_AVR32_SYSTEM_H */