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, 132 deletions

diff --git a/arch/tile/include/asm/cmpxchg.h b/arch/tile/include/asm/cmpxchg.h
deleted file mode 100644
index 25d5899497be..000000000000
--- a/arch/tile/include/asm/cmpxchg.h
+++ /dev/null
@@ -1,132 +0,0 @@
-/*
- * cmpxchg.h -- forked from asm/atomic.h with this copyright:
- *
- * Copyright 2010 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_CMPXCHG_H
-#define _ASM_TILE_CMPXCHG_H
-
-#ifndef __ASSEMBLY__
-
-#include <asm/barrier.h>
-
-/* Nonexistent functions intended to cause compile errors. */
-extern void __xchg_called_with_bad_pointer(void)
-	__compiletime_error("Bad argument size for xchg");
-extern void __cmpxchg_called_with_bad_pointer(void)
-	__compiletime_error("Bad argument size for cmpxchg");
-
-#ifndef __tilegx__
-
-/* Note the _atomic_xxx() routines include a final mb(). */
-int _atomic_xchg(int *ptr, int n);
-int _atomic_xchg_add(int *v, int i);
-int _atomic_xchg_add_unless(int *v, int a, int u);
-int _atomic_cmpxchg(int *ptr, int o, int n);
-long long _atomic64_xchg(long long *v, long long n);
-long long _atomic64_xchg_add(long long *v, long long i);
-long long _atomic64_xchg_add_unless(long long *v, long long a, long long u);
-long long _atomic64_cmpxchg(long long *v, long long o, long long n);
-
-#define xchg(ptr, n)							\
-	({								\
-		if (sizeof(*(ptr)) != 4)				\
-			__xchg_called_with_bad_pointer();		\
-		smp_mb();						\
-		(typeof(*(ptr)))_atomic_xchg((int *)(ptr), (int)(n));	\
-	})
-
-#define cmpxchg(ptr, o, n)						\
-	({								\
-		if (sizeof(*(ptr)) != 4)				\
-			__cmpxchg_called_with_bad_pointer();		\
-		smp_mb();						\
-		(typeof(*(ptr)))_atomic_cmpxchg((int *)ptr, (int)o,	\
-						(int)n);		\
-	})
-
-#define xchg64(ptr, n)							\
-	({								\
-		if (sizeof(*(ptr)) != 8)				\
-			__xchg_called_with_bad_pointer();		\
-		smp_mb();						\
-		(typeof(*(ptr)))_atomic64_xchg((long long *)(ptr),	\
-						(long long)(n));	\
-	})
-
-#define cmpxchg64(ptr, o, n)						\
-	({								\
-		if (sizeof(*(ptr)) != 8)				\
-			__cmpxchg_called_with_bad_pointer();		\
-		smp_mb();						\
-		(typeof(*(ptr)))_atomic64_cmpxchg((long long *)ptr,	\
-					(long long)o, (long long)n);	\
-	})
-
-#else
-
-#define xchg(ptr, n)							\
-	({								\
-		typeof(*(ptr)) __x;					\
-		smp_mb();						\
-		switch (sizeof(*(ptr))) {				\
-		case 4:							\
-			__x = (typeof(__x))(unsigned long)		\
-				__insn_exch4((ptr),			\
-					(u32)(unsigned long)(n));	\
-			break;						\
-		case 8:							\
-			__x = (typeof(__x))				\
-				__insn_exch((ptr), (unsigned long)(n));	\
-			break;						\
-		default:						\
-			__xchg_called_with_bad_pointer();		\
-			break;						\
-		}							\
-		smp_mb();						\
-		__x;							\
-	})
-
-#define cmpxchg(ptr, o, n)						\
-	({								\
-		typeof(*(ptr)) __x;					\
-		__insn_mtspr(SPR_CMPEXCH_VALUE, (unsigned long)(o));	\
-		smp_mb();						\
-		switch (sizeof(*(ptr))) {				\
-		case 4:							\
-			__x = (typeof(__x))(unsigned long)		\
-				__insn_cmpexch4((ptr),			\
-					(u32)(unsigned long)(n));	\
-			break;						\
-		case 8:							\
-			__x = (typeof(__x))__insn_cmpexch((ptr),	\
-						(long long)(n));	\
-			break;						\
-		default:						\
-			__cmpxchg_called_with_bad_pointer();		\
-			break;						\
-		}							\
-		smp_mb();						\
-		__x;							\
-	})
-
-#define xchg64 xchg
-#define cmpxchg64 cmpxchg
-
-#endif
-
-#endif /* __ASSEMBLY__ */
-
-#endif /* _ASM_TILE_CMPXCHG_H */