metag: Remove arch/metag/

The earliest Meta architecture port of Linux I have a record of was an
import of a Meta port of Linux v2.4.1 in February 2004, which was worked
on significantly over the next few years by Graham Whaley, Will Newton,
Matt Fleming, myself and others.

Eventually the port was merged into mainline in v3.9 in March 2013, not
long after Imagination Technologies bought MIPS Technologies and shifted
its CPU focus over to the MIPS architecture.

As a result, though the port was maintained for a while, kept on life
support for a while longer, and useful for testing a few specific
drivers for which I don't have ready access to the equivalent MIPS
hardware, it is now essentially dead with no users.

It is also stuck using an out-of-tree toolchain based on GCC 4.2.4 which
is no longer maintained, now struggles to build modern kernels due to
toolchain bugs, and doesn't itself build with a modern GCC. The latest
buildroot port is still using an old uClibc snapshot which is no longer
served, and the latest uClibc doesn't build with GCC 4.2.4.

So lets call it a day and drop the Meta architecture port from the
kernel. RIP Meta.

Signed-off-by: James Hogan <jhogan@kernel.org>
Link: https://lkml.kernel.org/r/95906b76-6ce1-3f84-eaba-c29b4ae952eb@roeck-us.net
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Graham Whaley <graham.whaley@gmail.com>
Cc: linux-metag@vger.kernel.org

1 files changed, 0 insertions, 101 deletions

diff --git a/arch/metag/include/asm/global_lock.h b/arch/metag/include/asm/global_lock.h
deleted file mode 100644
index 4d3da9682233..000000000000
--- a/arch/metag/include/asm/global_lock.h
+++ /dev/null
@@ -1,101 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef __ASM_METAG_GLOBAL_LOCK_H
-#define __ASM_METAG_GLOBAL_LOCK_H
-
-#include <asm/metag_mem.h>
-
-/**
- * __global_lock1() - Acquire global voluntary lock (LOCK1).
- * @flags:	Variable to store flags into.
- *
- * Acquires the Meta global voluntary lock (LOCK1), also taking care to disable
- * all triggers so we cannot be interrupted, and to enforce a compiler barrier
- * so that the compiler cannot reorder memory accesses across the lock.
- *
- * No other hardware thread will be able to acquire the voluntary or exclusive
- * locks until the voluntary lock is released with @__global_unlock1, but they
- * may continue to execute as long as they aren't trying to acquire either of
- * the locks.
- */
-#define __global_lock1(flags) do {					\
-	unsigned int __trval;						\
-	asm volatile("MOV	%0,#0\n\t"				\
-		     "SWAP	%0,TXMASKI\n\t"				\
-		     "LOCK1"						\
-		     : "=r" (__trval)					\
-		     :							\
-		     : "memory");					\
-	(flags) = __trval;						\
-} while (0)
-
-/**
- * __global_unlock1() - Release global voluntary lock (LOCK1).
- * @flags:	Variable to restore flags from.
- *
- * Releases the Meta global voluntary lock (LOCK1) acquired with
- * @__global_lock1, also taking care to re-enable triggers, and to enforce a
- * compiler barrier so that the compiler cannot reorder memory accesses across
- * the unlock.
- *
- * This immediately allows another hardware thread to acquire the voluntary or
- * exclusive locks.
- */
-#define __global_unlock1(flags) do {					\
-	unsigned int __trval = (flags);					\
-	asm volatile("LOCK0\n\t"					\
-		     "MOV	TXMASKI,%0"				\
-		     :							\
-		     : "r" (__trval)					\
-		     : "memory");					\
-} while (0)
-
-/**
- * __global_lock2() - Acquire global exclusive lock (LOCK2).
- * @flags:	Variable to store flags into.
- *
- * Acquires the Meta global voluntary lock and global exclusive lock (LOCK2),
- * also taking care to disable all triggers so we cannot be interrupted, to take
- * the atomic lock (system event) and to enforce a compiler barrier so that the
- * compiler cannot reorder memory accesses across the lock.
- *
- * No other hardware thread will be able to execute code until the locks are
- * released with @__global_unlock2.
- */
-#define __global_lock2(flags) do {					\
-	unsigned int __trval;						\
-	unsigned int __aloc_hi = LINSYSEVENT_WR_ATOMIC_LOCK & 0xFFFF0000; \
-	asm volatile("MOV	%0,#0\n\t"				\
-		     "SWAP	%0,TXMASKI\n\t"				\
-		     "LOCK2\n\t"					\
-		     "SETD	[%1+#0x40],D1RtP"			\
-		     : "=r&" (__trval)					\
-		     : "u" (__aloc_hi)					\
-		     : "memory");					\
-	(flags) = __trval;						\
-} while (0)
-
-/**
- * __global_unlock2() - Release global exclusive lock (LOCK2).
- * @flags:	Variable to restore flags from.
- *
- * Releases the Meta global exclusive lock (LOCK2) and global voluntary lock
- * acquired with @__global_lock2, also taking care to release the atomic lock
- * (system event), re-enable triggers, and to enforce a compiler barrier so that
- * the compiler cannot reorder memory accesses across the unlock.
- *
- * This immediately allows other hardware threads to continue executing and one
- * of them to acquire locks.
- */
-#define __global_unlock2(flags) do {					\
-	unsigned int __trval = (flags);					\
-	unsigned int __alock_hi = LINSYSEVENT_WR_ATOMIC_LOCK & 0xFFFF0000; \
-	asm volatile("SETD	[%1+#0x00],D1RtP\n\t"			\
-		     "LOCK0\n\t"					\
-		     "MOV	TXMASKI,%0"				\
-		     :							\
-		     : "r" (__trval),					\
-		       "u" (__alock_hi)					\
-		     : "memory");					\
-} while (0)
-
-#endif /* __ASM_METAG_GLOBAL_LOCK_H */