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is no longer maintained, now struggles to build modern kernels due to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, 85 deletions

diff --git a/arch/metag/include/asm/barrier.h b/arch/metag/include/asm/barrier.h
deleted file mode 100644
index 2661fec5696a..000000000000
--- a/arch/metag/include/asm/barrier.h
+++ /dev/null
@@ -1,85 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _ASM_METAG_BARRIER_H
-#define _ASM_METAG_BARRIER_H
-
-#include <asm/metag_mem.h>
-
-#define nop()		asm volatile ("NOP")
-
-#ifdef CONFIG_METAG_META21
-
-/* HTP and above have a system event to fence writes */
-static inline void wr_fence(void)
-{
-	volatile int *flushptr = (volatile int *) LINSYSEVENT_WR_FENCE;
-	barrier();
-	*flushptr = 0;
-	barrier();
-}
-
-#else /* CONFIG_METAG_META21 */
-
-/*
- * ATP doesn't have system event to fence writes, so it is necessary to flush
- * the processor write queues as well as possibly the write combiner (depending
- * on the page being written).
- * To ensure the write queues are flushed we do 4 writes to a system event
- * register (in this case write combiner flush) which will also flush the write
- * combiner.
- */
-static inline void wr_fence(void)
-{
-	volatile int *flushptr = (volatile int *) LINSYSEVENT_WR_COMBINE_FLUSH;
-	barrier();
-	*flushptr = 0;
-	*flushptr = 0;
-	*flushptr = 0;
-	*flushptr = 0;
-	barrier();
-}
-
-#endif /* !CONFIG_METAG_META21 */
-
-/* flush writes through the write combiner */
-#define mb()		wr_fence()
-#define rmb()		barrier()
-#define wmb()		mb()
-
-#ifdef CONFIG_METAG_SMP_WRITE_REORDERING
-/*
- * Write to the atomic memory unlock system event register (command 0). This is
- * needed before a write to shared memory in a critical section, to prevent
- * external reordering of writes before the fence on other threads with writes
- * after the fence on this thread (and to prevent the ensuing cache-memory
- * incoherence). It is therefore ineffective if used after and on the same
- * thread as a write.
- */
-static inline void metag_fence(void)
-{
-	volatile int *flushptr = (volatile int *) LINSYSEVENT_WR_ATOMIC_UNLOCK;
-	barrier();
-	*flushptr = 0;
-	barrier();
-}
-#define __smp_mb()	metag_fence()
-#define __smp_rmb()	metag_fence()
-#define __smp_wmb()	barrier()
-#else
-#define metag_fence()	do { } while (0)
-#define __smp_mb()	barrier()
-#define __smp_rmb()	barrier()
-#define __smp_wmb()	barrier()
-#endif
-
-#ifdef CONFIG_SMP
-#define fence()		metag_fence()
-#else
-#define fence()		do { } while (0)
-#endif
-
-#define __smp_mb__before_atomic()	barrier()
-#define __smp_mb__after_atomic()	barrier()
-
-#include <asm-generic/barrier.h>
-
-#endif /* _ASM_METAG_BARRIER_H */