[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, 102 insertions, 0 deletions

diff --git a/include/asm-avr32/asm.h b/include/asm-avr32/asm.h
new file mode 100644
index 00000000000..515c7618952
--- /dev/null
+++ b/include/asm-avr32/asm.h
@@ -0,0 +1,102 @@
+/*
+ * 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_ASM_H__
+#define __ASM_AVR32_ASM_H__
+
+#include <asm/sysreg.h>
+#include <asm/asm-offsets.h>
+#include <asm/thread_info.h>
+
+#define mask_interrupts		ssrf	SR_GM_BIT
+#define mask_exceptions		ssrf	SR_EM_BIT
+#define unmask_interrupts	csrf	SR_GM_BIT
+#define unmask_exceptions	csrf	SR_EM_BIT
+
+#ifdef CONFIG_FRAME_POINTER
+	.macro	save_fp
+	st.w	--sp, r7
+	.endm
+	.macro	restore_fp
+	ld.w	r7, sp++
+	.endm
+	.macro	zero_fp
+	mov	r7, 0
+	.endm
+#else
+	.macro	save_fp
+	.endm
+	.macro	restore_fp
+	.endm
+	.macro	zero_fp
+	.endm
+#endif
+	.macro	get_thread_info reg
+	mov	\reg, sp
+	andl	\reg, ~(THREAD_SIZE - 1) & 0xffff
+	.endm
+
+	/* Save and restore registers */
+	.macro	save_min sr, tmp=lr
+	pushm	lr
+	mfsr	\tmp, \sr
+	zero_fp
+	st.w	--sp, \tmp
+	.endm
+
+	.macro	restore_min sr, tmp=lr
+	ld.w	\tmp, sp++
+	mtsr	\sr, \tmp
+	popm	lr
+	.endm
+
+	.macro	save_half sr, tmp=lr
+	save_fp
+	pushm	r8-r9,r10,r11,r12,lr
+	zero_fp
+	mfsr	\tmp, \sr
+	st.w	--sp, \tmp
+	.endm
+
+	.macro	restore_half sr, tmp=lr
+	ld.w	\tmp, sp++
+	mtsr	\sr, \tmp
+	popm	r8-r9,r10,r11,r12,lr
+	restore_fp
+	.endm
+
+	.macro	save_full_user sr, tmp=lr
+	stmts	--sp, r0,r1,r2,r3,r4,r5,r6,r7,r8,r9,r10,r11,r12,sp,lr
+	st.w	--sp, lr
+	zero_fp
+	mfsr	\tmp, \sr
+	st.w	--sp, \tmp
+	.endm
+
+	.macro	restore_full_user sr, tmp=lr
+	ld.w	\tmp, sp++
+	mtsr	\sr, \tmp
+	ld.w	lr, sp++
+	ldmts	sp++, r0,r1,r2,r3,r4,r5,r6,r7,r8,r9,r10,r11,r12,sp,lr
+	.endm
+
+	/* uaccess macros */
+	.macro branch_if_kernel scratch, label
+	get_thread_info \scratch
+	ld.w	\scratch, \scratch[TI_flags]
+	bld	\scratch, TIF_USERSPACE
+	brcc	\label
+	.endm
+
+	.macro ret_if_privileged scratch, addr, size, ret
+	sub	\scratch, \size, 1
+	add	\scratch, \addr
+	retcs	\ret
+	retmi	\ret
+	.endm
+
+#endif /* __ASM_AVR32_ASM_H__ */