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is no longer maintained, now struggles to build modern kernels due to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, 69 deletions

diff --git a/arch/metag/mm/maccess.c b/arch/metag/mm/maccess.c
deleted file mode 100644
index c22755165df9..000000000000
--- a/arch/metag/mm/maccess.c
+++ /dev/null
@@ -1,69 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * safe read and write memory routines callable while atomic
- *
- * Copyright 2012 Imagination Technologies
- */
-
-#include <linux/uaccess.h>
-#include <asm/io.h>
-
-/*
- * The generic probe_kernel_write() uses the user copy code which can split the
- * writes if the source is unaligned, and repeats writes to make exceptions
- * precise. We override it here to avoid these things happening to memory mapped
- * IO memory where they could have undesired effects.
- * Due to the use of CACHERD instruction this only works on Meta2 onwards.
- */
-#ifdef CONFIG_METAG_META21
-long probe_kernel_write(void *dst, const void *src, size_t size)
-{
-	unsigned long ldst = (unsigned long)dst;
-	void __iomem *iodst = (void __iomem *)dst;
-	unsigned long lsrc = (unsigned long)src;
-	const u8 *psrc = (u8 *)src;
-	unsigned int pte, i;
-	u8 bounce[8] __aligned(8);
-
-	if (!size)
-		return 0;
-
-	/* Use the write combine bit to decide is the destination is MMIO. */
-	pte = __builtin_meta2_cacherd(dst);
-
-	/* Check the mapping is valid and writeable. */
-	if ((pte & (MMCU_ENTRY_WR_BIT | MMCU_ENTRY_VAL_BIT))
-	    != (MMCU_ENTRY_WR_BIT | MMCU_ENTRY_VAL_BIT))
-		return -EFAULT;
-
-	/* Fall back to generic version for cases we're not interested in. */
-	if (pte & MMCU_ENTRY_WRC_BIT	|| /* write combined memory */
-	    (ldst & (size - 1))		|| /* destination unaligned */
-	    size > 8			|| /* more than max write size */
-	    (size & (size - 1)))	   /* non power of 2 size */
-		return __probe_kernel_write(dst, src, size);
-
-	/* If src is unaligned, copy to the aligned bounce buffer first. */
-	if (lsrc & (size - 1)) {
-		for (i = 0; i < size; ++i)
-			bounce[i] = psrc[i];
-		psrc = bounce;
-	}
-
-	switch (size) {
-	case 1:
-		writeb(*psrc, iodst);
-		break;
-	case 2:
-		writew(*(const u16 *)psrc, iodst);
-		break;
-	case 4:
-		writel(*(const u32 *)psrc, iodst);
-		break;
-	case 8:
-		writeq(*(const u64 *)psrc, iodst);
-		break;
-	}
-	return 0;
-}
-#endif