[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>
diff --git a/arch/avr32/mm/cache.c b/arch/avr32/mm/cache.c
new file mode 100644
index 0000000..450515b
--- /dev/null
+++ b/arch/avr32/mm/cache.c
@@ -0,0 +1,150 @@
+/*
+ * 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 <linux/highmem.h>
+#include <linux/unistd.h>
+
+#include <asm/cacheflush.h>
+#include <asm/cachectl.h>
+#include <asm/processor.h>
+#include <asm/uaccess.h>
+
+/*
+ * If you attempt to flush anything more than this, you need superuser
+ * privileges. The value is completely arbitrary.
+ */
+#define CACHEFLUSH_MAX_LEN 1024
+
+void invalidate_dcache_region(void *start, size_t size)
+{
+ unsigned long v, begin, end, linesz;
+
+ linesz = boot_cpu_data.dcache.linesz;
+
+ //printk("invalidate dcache: %p + %u\n", start, size);
+
+ /* You asked for it, you got it */
+ begin = (unsigned long)start & ~(linesz - 1);
+ end = ((unsigned long)start + size + linesz - 1) & ~(linesz - 1);
+
+ for (v = begin; v < end; v += linesz)
+ invalidate_dcache_line((void *)v);
+}
+
+void clean_dcache_region(void *start, size_t size)
+{
+ unsigned long v, begin, end, linesz;
+
+ linesz = boot_cpu_data.dcache.linesz;
+ begin = (unsigned long)start & ~(linesz - 1);
+ end = ((unsigned long)start + size + linesz - 1) & ~(linesz - 1);
+
+ for (v = begin; v < end; v += linesz)
+ clean_dcache_line((void *)v);
+ flush_write_buffer();
+}
+
+void flush_dcache_region(void *start, size_t size)
+{
+ unsigned long v, begin, end, linesz;
+
+ linesz = boot_cpu_data.dcache.linesz;
+ begin = (unsigned long)start & ~(linesz - 1);
+ end = ((unsigned long)start + size + linesz - 1) & ~(linesz - 1);
+
+ for (v = begin; v < end; v += linesz)
+ flush_dcache_line((void *)v);
+ flush_write_buffer();
+}
+
+void invalidate_icache_region(void *start, size_t size)
+{
+ unsigned long v, begin, end, linesz;
+
+ linesz = boot_cpu_data.icache.linesz;
+ begin = (unsigned long)start & ~(linesz - 1);
+ end = ((unsigned long)start + size + linesz - 1) & ~(linesz - 1);
+
+ for (v = begin; v < end; v += linesz)
+ invalidate_icache_line((void *)v);
+}
+
+static inline void __flush_icache_range(unsigned long start, unsigned long end)
+{
+ unsigned long v, linesz;
+
+ linesz = boot_cpu_data.dcache.linesz;
+ for (v = start; v < end; v += linesz) {
+ clean_dcache_line((void *)v);
+ invalidate_icache_line((void *)v);
+ }
+
+ flush_write_buffer();
+}
+
+/*
+ * This one is called after a module has been loaded.
+ */
+void flush_icache_range(unsigned long start, unsigned long end)
+{
+ unsigned long linesz;
+
+ linesz = boot_cpu_data.dcache.linesz;
+ __flush_icache_range(start & ~(linesz - 1),
+ (end + linesz - 1) & ~(linesz - 1));
+}
+
+/*
+ * This one is called from do_no_page(), do_swap_page() and install_page().
+ */
+void flush_icache_page(struct vm_area_struct *vma, struct page *page)
+{
+ if (vma->vm_flags & VM_EXEC) {
+ void *v = kmap(page);
+ __flush_icache_range((unsigned long)v, (unsigned long)v + PAGE_SIZE);
+ kunmap(v);
+ }
+}
+
+/*
+ * This one is used by copy_to_user_page()
+ */
+void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
+ unsigned long addr, int len)
+{
+ if (vma->vm_flags & VM_EXEC)
+ flush_icache_range(addr, addr + len);
+}
+
+asmlinkage int sys_cacheflush(int operation, void __user *addr, size_t len)
+{
+ int ret;
+
+ if (len > CACHEFLUSH_MAX_LEN) {
+ ret = -EPERM;
+ if (!capable(CAP_SYS_ADMIN))
+ goto out;
+ }
+
+ ret = -EFAULT;
+ if (!access_ok(VERIFY_WRITE, addr, len))
+ goto out;
+
+ switch (operation) {
+ case CACHE_IFLUSH:
+ flush_icache_range((unsigned long)addr,
+ (unsigned long)addr + len);
+ ret = 0;
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+out:
+ return ret;
+}
