[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, 197 insertions, 0 deletions

diff --git a/arch/avr32/mm/ioremap.c b/arch/avr32/mm/ioremap.c
new file mode 100644
index 0000000..5360218
--- /dev/null
+++ b/arch/avr32/mm/ioremap.c
@@ -0,0 +1,197 @@
+/*
+ * 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/vmalloc.h>
+#include <linux/module.h>
+
+#include <asm/io.h>
+#include <asm/pgtable.h>
+#include <asm/cacheflush.h>
+#include <asm/tlbflush.h>
+#include <asm/addrspace.h>
+
+static inline int remap_area_pte(pte_t *pte, unsigned long address,
+				  unsigned long end, unsigned long phys_addr,
+				  pgprot_t prot)
+{
+	unsigned long pfn;
+
+	pfn = phys_addr >> PAGE_SHIFT;
+	do {
+		WARN_ON(!pte_none(*pte));
+
+		set_pte(pte, pfn_pte(pfn, prot));
+		address += PAGE_SIZE;
+		pfn++;
+		pte++;
+	} while (address && (address < end));
+
+	return 0;
+}
+
+static inline int remap_area_pmd(pmd_t *pmd, unsigned long address,
+				 unsigned long end, unsigned long phys_addr,
+				 pgprot_t prot)
+{
+	unsigned long next;
+
+	phys_addr -= address;
+
+	do {
+		pte_t *pte = pte_alloc_kernel(pmd, address);
+		if (!pte)
+			return -ENOMEM;
+
+		next = (address + PMD_SIZE) & PMD_MASK;
+		if (remap_area_pte(pte, address, next,
+				   address + phys_addr, prot))
+			return -ENOMEM;
+
+		address = next;
+		pmd++;
+	} while (address && (address < end));
+	return 0;
+}
+
+static int remap_area_pud(pud_t *pud, unsigned long address,
+			  unsigned long end, unsigned long phys_addr,
+			  pgprot_t prot)
+{
+	unsigned long next;
+
+	phys_addr -= address;
+
+	do {
+		pmd_t *pmd = pmd_alloc(&init_mm, pud, address);
+		if (!pmd)
+			return -ENOMEM;
+		next = (address + PUD_SIZE) & PUD_MASK;
+		if (remap_area_pmd(pmd, address, next,
+				   phys_addr + address, prot))
+			return -ENOMEM;
+
+		address = next;
+		pud++;
+	} while (address && address < end);
+
+	return 0;
+}
+
+static int remap_area_pages(unsigned long address, unsigned long phys_addr,
+			    size_t size, pgprot_t prot)
+{
+	unsigned long end = address + size;
+	unsigned long next;
+	pgd_t *pgd;
+	int err = 0;
+
+	phys_addr -= address;
+
+	pgd = pgd_offset_k(address);
+	flush_cache_all();
+	BUG_ON(address >= end);
+
+	spin_lock(&init_mm.page_table_lock);
+	do {
+		pud_t *pud = pud_alloc(&init_mm, pgd, address);
+
+		err = -ENOMEM;
+		if (!pud)
+			break;
+
+		next = (address + PGDIR_SIZE) & PGDIR_MASK;
+		if (next < address || next > end)
+			next = end;
+		err = remap_area_pud(pud, address, next,
+				     phys_addr + address, prot);
+		if (err)
+			break;
+
+		address = next;
+		pgd++;
+	} while (address && (address < end));
+
+	spin_unlock(&init_mm.page_table_lock);
+	flush_tlb_all();
+	return err;
+}
+
+/*
+ * Re-map an arbitrary physical address space into the kernel virtual
+ * address space. Needed when the kernel wants to access physical
+ * memory directly.
+ */
+void __iomem *__ioremap(unsigned long phys_addr, size_t size,
+			unsigned long flags)
+{
+	void *addr;
+	struct vm_struct *area;
+	unsigned long offset, last_addr;
+	pgprot_t prot;
+
+	/*
+	 * Check if we can simply use the P4 segment. This area is
+	 * uncacheable, so if caching/buffering is requested, we can't
+	 * use it.
+	 */
+	if ((phys_addr >= P4SEG) && (flags == 0))
+		return (void __iomem *)phys_addr;
+
+	/* Don't allow wraparound or zero size */
+	last_addr = phys_addr + size - 1;
+	if (!size || last_addr < phys_addr)
+		return NULL;
+
+	/*
+	 * XXX: When mapping regular RAM, we'd better make damn sure
+	 * it's never used for anything else.  But this is really the
+	 * caller's responsibility...
+	 */
+	if (PHYSADDR(P2SEGADDR(phys_addr)) == phys_addr)
+		return (void __iomem *)P2SEGADDR(phys_addr);
+
+	/* Mappings have to be page-aligned */
+	offset = phys_addr & ~PAGE_MASK;
+	phys_addr &= PAGE_MASK;
+	size = PAGE_ALIGN(last_addr + 1) - phys_addr;
+
+	prot = __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY
+			| _PAGE_ACCESSED | _PAGE_TYPE_SMALL | flags);
+
+	/*
+	 * Ok, go for it..
+	 */
+	area = get_vm_area(size, VM_IOREMAP);
+	if (!area)
+		return NULL;
+	area->phys_addr = phys_addr;
+	addr = area->addr;
+	if (remap_area_pages((unsigned long)addr, phys_addr, size, prot)) {
+		vunmap(addr);
+		return NULL;
+	}
+
+	return (void __iomem *)(offset + (char *)addr);
+}
+EXPORT_SYMBOL(__ioremap);
+
+void __iounmap(void __iomem *addr)
+{
+	struct vm_struct *p;
+
+	if ((unsigned long)addr >= P4SEG)
+		return;
+
+	p = remove_vm_area((void *)(PAGE_MASK & (unsigned long __force)addr));
+	if (unlikely(!p)) {
+		printk (KERN_ERR "iounmap: bad address %p\n", addr);
+		return;
+	}
+
+	kfree (p);
+}
+EXPORT_SYMBOL(__iounmap);