arch: remove tile port

The Tile architecture port was added by Chris Metcalf in 2010, and
maintained until early 2018 when he orphaned it due to his departure
from Mellanox, and nobody else stepped up to maintain it. The product
line is still around in the form of the BlueField SoC, but no longer
uses the Tile architecture.

There are also still products for sale with Tile-GX SoCs, notably the
Mikrotik CCR router family. The products all use old (linux-3.3) kernels
with lots of patches and won't be upgraded by their manufacturers. There
have been efforts to port both OpenWRT and Debian to these, but both
projects have stalled and are very unlikely to be continued in the future.

Given that we are reasonably sure that nobody is still using the port
with an upstream kernel any more, it seems better to remove it now while
the port is in a good shape than to let it bitrot for a few years first.

Cc: Chris Metcalf <chris.d.metcalf@gmail.com>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Link: http://www.mellanox.com/page/npu_multicore_overview
Link: https://jenkins.debian.net/view/rebootstrap/job/rebootstrap_tilegx_gcc7/
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 0 insertions, 43 deletions

diff --git a/arch/tile/include/uapi/asm/cachectl.h b/arch/tile/include/uapi/asm/cachectl.h
deleted file mode 100644
index ed8bac28a1b9..000000000000
--- a/arch/tile/include/uapi/asm/cachectl.h
+++ /dev/null
@@ -1,43 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
-/*
- * Copyright 2011 Tilera Corporation. All Rights Reserved.
- *
- *   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, version 2.
- *
- *   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, GOOD TITLE or
- *   NON INFRINGEMENT.  See the GNU General Public License for
- *   more details.
- */
-
-#ifndef _ASM_TILE_CACHECTL_H
-#define _ASM_TILE_CACHECTL_H
-
-/*
- * Options for cacheflush system call.
- *
- * The ICACHE flush is performed on all cores currently running the
- * current process's address space.  The intent is for user
- * applications to be able to modify code, invoke the system call,
- * then allow arbitrary other threads in the same address space to see
- * the newly-modified code.  Passing a length of CHIP_L1I_CACHE_SIZE()
- * or more invalidates the entire icache on all cores in the address
- * spaces.  (Note: currently this option invalidates the entire icache
- * regardless of the requested address and length, but we may choose
- * to honor the arguments at some point.)
- *
- * Flush and invalidation of memory can normally be performed with the
- * __insn_flush() and __insn_finv() instructions from userspace.
- * The DCACHE option to the system call allows userspace
- * to flush the entire L1+L2 data cache from the core.  In this case,
- * the address and length arguments are not used.  The DCACHE flush is
- * restricted to the current core, not all cores in the address space.
- */
-#define	ICACHE	(1<<0)		/* invalidate L1 instruction cache */
-#define	DCACHE	(1<<1)		/* flush and invalidate data cache */
-#define	BCACHE	(ICACHE|DCACHE)	/* flush both caches               */
-
-#endif	/* _ASM_TILE_CACHECTL_H */