[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>

4 files changed, 126 insertions, 0 deletions

diff --git a/arch/avr32/boot/images/Makefile b/arch/avr32/boot/images/Makefile
new file mode 100644
index 000000000000..ccd74eeecec3
--- /dev/null
+++ b/arch/avr32/boot/images/Makefile
@@ -0,0 +1,62 @@
+#
+# Copyright (C) 2004-2006 Atmel Corporation
+#
+# This file is subject to the terms and conditions of the GNU General Public
+# License.  See the file "COPYING" in the main directory of this archive
+# for more details.
+#
+
+MKIMAGE         := $(srctree)/scripts/mkuboot.sh
+
+extra-y         := vmlinux.bin vmlinux.gz
+
+OBJCOPYFLAGS_vmlinux.bin := -O binary
+$(obj)/vmlinux.bin: vmlinux FORCE
+        $(call if_changed,objcopy)
+
+$(obj)/vmlinux.gz: $(obj)/vmlinux.bin FORCE
+        $(call if_changed,gzip)
+
+quiet_cmd_uimage = UIMAGE $@
+      cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A avr32 -O linux -T kernel       \
+                -C gzip -a $(CONFIG_LOAD_ADDRESS) -e $(CONFIG_ENTRY_ADDRESS)    \
+                -n 'Linux-$(KERNELRELEASE)' -d $< $@
+
+targets += uImage uImage.srec
+$(obj)/uImage: $(obj)/vmlinux.gz
+        $(call if_changed,uimage)
+        @echo '  Image $@ is ready'
+
+OBJCOPYFLAGS_uImage.srec := -I binary -O srec
+$(obj)/uImage.srec: $(obj)/uImage
+        $(call if_changed,objcopy)
+
+OBJCOPYFLAGS_vmlinux.elf := --change-section-lma .text-0x80000000 \
+                            --change-section-lma __ex_table-0x80000000 \
+                            --change-section-lma .rodata-0x80000000 \
+                            --change-section-lma .data-0x80000000 \
+                            --change-section-lma .init-0x80000000 \
+                            --change-section-lma .bss-0x80000000 \
+                            --change-section-lma .initrd-0x80000000 \
+                            --change-section-lma __param-0x80000000 \
+                            --change-section-lma __ksymtab-0x80000000 \
+                            --change-section-lma __ksymtab_gpl-0x80000000 \
+                            --change-section-lma __kcrctab-0x80000000 \
+                            --change-section-lma __kcrctab_gpl-0x80000000 \
+                            --change-section-lma __ksymtab_strings-0x80000000 \
+                            --change-section-lma .got-0x80000000 \
+                            --set-start 0xa0000000
+$(obj)/vmlinux.elf: vmlinux FORCE
+        $(call if_changed,objcopy)
+
+quiet_cmd_sfdwarf = SFDWARF $@
+      cmd_sfdwarf = sfdwarf $< TO $@ GNUAVR IW $(SFDWARF_FLAGS) > $(obj)/sfdwarf.log
+
+$(obj)/vmlinux.cso: $(obj)/vmlinux.elf FORCE
+        $(call if_changed,sfdwarf)
+
+install: $(BOOTIMAGE)
+        sh $(srctree)/install-kernel.sh $<
+
+# Generated files to be removed upon make clean
+clean-files     := vmlinux* uImage uImage.srec
diff --git a/arch/avr32/boot/u-boot/Makefile b/arch/avr32/boot/u-boot/Makefile
new file mode 100644
index 000000000000..125ddc96c275
--- /dev/null
+++ b/arch/avr32/boot/u-boot/Makefile
@@ -0,0 +1,3 @@
+extra-y         := head.o
+
+obj-y           := empty.o
diff --git a/arch/avr32/boot/u-boot/empty.S b/arch/avr32/boot/u-boot/empty.S
new file mode 100644
index 000000000000..8ac91a5f12f0
--- /dev/null
+++ b/arch/avr32/boot/u-boot/empty.S
@@ -0,0 +1 @@
+/* Empty file */
diff --git a/arch/avr32/boot/u-boot/head.S b/arch/avr32/boot/u-boot/head.S
new file mode 100644
index 000000000000..4488fa27fe94
--- /dev/null
+++ b/arch/avr32/boot/u-boot/head.S
@@ -0,0 +1,60 @@
+/*
+ * Startup code for use with the u-boot bootloader.
+ *
+ * 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.
+ */
+#include <asm/setup.h>
+
+        /*
+         * The kernel is loaded where we want it to be and all caches
+         * have just been flushed. We get two parameters from u-boot:
+         *
+         * r12 contains a magic number (ATAG_MAGIC)
+         * r11 points to a tag table providing information about
+         *     the system.
+         */
+        .section .init.text,"ax"
+        .global _start
+_start:
+        /* Check if the boot loader actually provided a tag table */
+        lddpc   r0, magic_number
+        cp.w    r12, r0
+        brne    no_tag_table
+
+        /* Initialize .bss */
+        lddpc   r2, bss_start_addr
+        lddpc   r3, end_addr
+        mov     r0, 0
+        mov     r1, 0
+1:      st.d    r2++, r0
+        cp      r2, r3
+        brlo    1b
+
+        /*
+         * Save the tag table address for later use. This must be done
+         * _after_ .bss has been initialized...
+         */
+        lddpc   r0, tag_table_addr
+        st.w    r0[0], r11
+
+        /* Jump to loader-independent setup code */
+        rjmp    kernel_entry
+
+        .align  2
+magic_number:
+        .long   ATAG_MAGIC
+tag_table_addr:
+        .long   bootloader_tags
+bss_start_addr:
+        .long   __bss_start
+end_addr:
+        .long   _end
+
+no_tag_table:
+        sub     r12, pc, (. - 2f)
+        bral    panic
+2:      .asciz  "Boot loader didn't provide correct magic number\n"