blackfin architecture

This adds support for the Analog Devices Blackfin processor architecture, and
currently supports the BF533, BF532, BF531, BF537, BF536, BF534, and BF561
(Dual Core) devices, with a variety of development platforms including those
avaliable from Analog Devices (BF533-EZKit, BF533-STAMP, BF537-STAMP,
BF561-EZKIT), and Bluetechnix!  Tinyboards.

The Blackfin architecture was jointly developed by Intel and Analog Devices
Inc.  (ADI) as the Micro Signal Architecture (MSA) core and introduced it in
December of 2000.  Since then ADI has put this core into its Blackfin
processor family of devices.  The Blackfin core has the advantages of a clean,
orthogonal,RISC-like microprocessor instruction set.  It combines a dual-MAC
(Multiply/Accumulate), state-of-the-art signal processing engine and
single-instruction, multiple-data (SIMD) multimedia capabilities into a single
instruction-set architecture.

The Blackfin architecture, including the instruction set, is described by the
ADSP-BF53x/BF56x Blackfin Processor Programming Reference
http://blackfin.uclinux.org/gf/download/frsrelease/29/2549/Blackfin_PRM.pdf

The Blackfin processor is already supported by major releases of gcc, and
there are binary and source rpms/tarballs for many architectures at:
http://blackfin.uclinux.org/gf/project/toolchain/frs There is complete
documentation, including "getting started" guides available at:
http://docs.blackfin.uclinux.org/ which provides links to the sources and
patches you will need in order to set up a cross-compiling environment for
bfin-linux-uclibc

This patch, as well as the other patches (toolchain, distribution,
uClibc) are actively supported by Analog Devices Inc, at:
http://blackfin.uclinux.org/

We have tested this on LTP, and our test plan (including pass/fails) can
be found at:
http://docs.blackfin.uclinux.org/doku.php?id=testing_the_linux_kernel

[m.kozlowski@tuxland.pl: balance parenthesis in blackfin header files]
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
Signed-off-by: Mariusz Kozlowski <m.kozlowski@tuxland.pl>
Signed-off-by: Aubrey Li <aubrey.li@analog.com>
Signed-off-by: Jie Zhang <jie.zhang@analog.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 90 insertions, 0 deletions

diff --git a/include/asm-blackfin/cacheflush.h b/include/asm-blackfin/cacheflush.h
new file mode 100644
index 000000000000..e5e000de3c36
--- /dev/null
+++ b/include/asm-blackfin/cacheflush.h
@@ -0,0 +1,90 @@
+/*
+ * File:         include/asm-blackfin/cacheflush.h
+ * Based on:	 include/asm-m68knommu/cacheflush.h
+ * Author:       LG Soft India
+ *               Copyright (C) 2004 Analog Devices Inc.
+ * Created:      Tue Sep 21 2004
+ * Description:  Blackfin low-level cache routines adapted from the i386
+ * 		 and PPC versions by Greg Ungerer (gerg@snapgear.com)
+ *
+ * Modified:
+ *
+ * Bugs:         Enter bugs at http://blackfin.uclinux.org/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.
+ * If not, write to the Free Software Foundation,
+ * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#ifndef _BLACKFIN_CACHEFLUSH_H
+#define _BLACKFIN_CACHEFLUSH_H
+
+#include <asm/cplb.h>
+
+extern void blackfin_icache_dcache_flush_range(unsigned int, unsigned int);
+extern void blackfin_icache_flush_range(unsigned int, unsigned int);
+extern void blackfin_dcache_flush_range(unsigned int, unsigned int);
+extern void blackfin_dcache_invalidate_range(unsigned int, unsigned int);
+extern void blackfin_dflush_page(void *);
+
+#define flush_dcache_mmap_lock(mapping)		do { } while (0)
+#define flush_dcache_mmap_unlock(mapping)	do { } while (0)
+#define flush_cache_mm(mm)			do { } while (0)
+#define flush_cache_range(vma, start, end)	do { } while (0)
+#define flush_cache_page(vma, vmaddr)		do { } while (0)
+#define flush_cache_vmap(start, end)		do { } while (0)
+#define flush_cache_vunmap(start, end)		do { } while (0)
+
+static inline void flush_icache_range(unsigned start, unsigned end)
+{
+#if defined(CONFIG_BLKFIN_DCACHE) && defined(CONFIG_BLKFIN_CACHE)
+
+# if defined(CONFIG_BLKFIN_WT)
+	blackfin_icache_flush_range((start), (end));
+# else
+	blackfin_icache_dcache_flush_range((start), (end));
+# endif
+
+#else
+
+# if defined(CONFIG_BLKFIN_CACHE)
+	blackfin_icache_flush_range((start), (end));
+# endif
+# if defined(CONFIG_BLKFIN_DCACHE)
+	blackfin_dcache_flush_range((start), (end));
+# endif
+
+#endif
+}
+
+#define copy_to_user_page(vma, page, vaddr, dst, src, len) \
+do { memcpy(dst, src, len); \
+     flush_icache_range ((unsigned) (dst), (unsigned) (dst) + (len)); \
+} while (0)
+#define copy_from_user_page(vma, page, vaddr, dst, src, len)	memcpy(dst, src, len)
+
+#if defined(CONFIG_BLKFIN_DCACHE)
+# define invalidate_dcache_range(start,end)	blackfin_dcache_invalidate_range((start), (end))
+#else
+# define invalidate_dcache_range(start,end)	do { } while (0)
+#endif
+#if defined(CONFIG_BLKFIN_DCACHE) && defined(CONFIG_BLKFIN_WB)
+# define flush_dcache_range(start,end)		blackfin_dcache_flush_range((start), (end))
+# define flush_dcache_page(page)			blackfin_dflush_page(page_address(page))
+#else
+# define flush_dcache_range(start,end)		do { } while (0)
+# define flush_dcache_page(page)			do { } while (0)
+#endif
+
+#endif				/* _BLACKFIN_CACHEFLUSH_H */