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is no longer maintained, now struggles to build modern kernels due to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, 132 deletions

diff --git a/arch/metag/kernel/cachepart.c b/arch/metag/kernel/cachepart.c
deleted file mode 100644
index 6e0f8a80cc96..000000000000
--- a/arch/metag/kernel/cachepart.c
+++ /dev/null
@@ -1,132 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Meta cache partition manipulation.
- *
- * Copyright 2010 Imagination Technologies Ltd.
- */
-
-#include <linux/kernel.h>
-#include <linux/io.h>
-#include <linux/errno.h>
-#include <asm/processor.h>
-#include <asm/cachepart.h>
-#include <asm/metag_isa.h>
-#include <asm/metag_mem.h>
-
-#define SYSC_DCPART(n)	(SYSC_DCPART0 + SYSC_xCPARTn_STRIDE * (n))
-#define SYSC_ICPART(n)	(SYSC_ICPART0 + SYSC_xCPARTn_STRIDE * (n))
-
-#define CACHE_ASSOCIATIVITY 4 /* 4 way set-associative */
-#define ICACHE 0
-#define DCACHE 1
-
-/* The CORE_CONFIG2 register is not available on Meta 1 */
-#ifdef CONFIG_METAG_META21
-unsigned int get_dcache_size(void)
-{
-	unsigned int config2 = metag_in32(METAC_CORE_CONFIG2);
-	unsigned int sz = 0x1000 << ((config2 & METAC_CORECFG2_DCSZ_BITS)
-				     >> METAC_CORECFG2_DCSZ_S);
-	if (config2 & METAC_CORECFG2_DCSMALL_BIT)
-		sz >>= 6;
-	return sz;
-}
-
-unsigned int get_icache_size(void)
-{
-	unsigned int config2 = metag_in32(METAC_CORE_CONFIG2);
-	unsigned int sz = 0x1000 << ((config2 & METAC_CORE_C2ICSZ_BITS)
-				     >> METAC_CORE_C2ICSZ_S);
-	if (config2 & METAC_CORECFG2_ICSMALL_BIT)
-		sz >>= 6;
-	return sz;
-}
-
-unsigned int get_global_dcache_size(void)
-{
-	unsigned int cpart = metag_in32(SYSC_DCPART(hard_processor_id()));
-	unsigned int temp = cpart & SYSC_xCPARTG_AND_BITS;
-	return (get_dcache_size() * ((temp >> SYSC_xCPARTG_AND_S) + 1)) >> 4;
-}
-
-unsigned int get_global_icache_size(void)
-{
-	unsigned int cpart = metag_in32(SYSC_ICPART(hard_processor_id()));
-	unsigned int temp = cpart & SYSC_xCPARTG_AND_BITS;
-	return (get_icache_size() * ((temp >> SYSC_xCPARTG_AND_S) + 1)) >> 4;
-}
-
-static int get_thread_cache_size(unsigned int cache, int thread_id)
-{
-	unsigned int cache_size;
-	unsigned int t_cache_part;
-	unsigned int isEnabled;
-	unsigned int offset = 0;
-	isEnabled = (cache == DCACHE ? metag_in32(MMCU_DCACHE_CTRL_ADDR) & 0x1 :
-		metag_in32(MMCU_ICACHE_CTRL_ADDR) & 0x1);
-	if (!isEnabled)
-		return 0;
-#if PAGE_OFFSET >= LINGLOBAL_BASE
-	/* Checking for global cache */
-	cache_size = (cache == DCACHE ? get_global_dcache_size() :
-		get_global_icache_size());
-	offset = 8;
-#else
-	cache_size = (cache == DCACHE ? get_dcache_size() :
-		get_icache_size());
-#endif
-	t_cache_part = (cache == DCACHE ?
-		(metag_in32(SYSC_DCPART(thread_id)) >> offset) & 0xF :
-		(metag_in32(SYSC_ICPART(thread_id)) >> offset) & 0xF);
-	switch (t_cache_part) {
-	case 0xF:
-		return cache_size;
-	case 0x7:
-		return cache_size / 2;
-	case 0x3:
-		return cache_size / 4;
-	case 0x1:
-		return cache_size / 8;
-	case 0:
-		return cache_size / 16;
-	}
-	return -1;
-}
-
-void check_for_cache_aliasing(int thread_id)
-{
-	int thread_cache_size;
-	unsigned int cache_type;
-	for (cache_type = ICACHE; cache_type <= DCACHE; cache_type++) {
-		thread_cache_size =
-				get_thread_cache_size(cache_type, thread_id);
-		if (thread_cache_size < 0)
-			pr_emerg("Can't read %s cache size\n",
-				 cache_type ? "DCACHE" : "ICACHE");
-		else if (thread_cache_size == 0)
-			/* Cache is off. No need to check for aliasing */
-			continue;
-		if (thread_cache_size / CACHE_ASSOCIATIVITY > PAGE_SIZE) {
-			pr_emerg("Potential cache aliasing detected in %s on Thread %d\n",
-				 cache_type ? "DCACHE" : "ICACHE", thread_id);
-			pr_warn("Total %s size: %u bytes\n",
-				cache_type ? "DCACHE" : "ICACHE",
-				cache_type ? get_dcache_size()
-				: get_icache_size());
-			pr_warn("Thread %s size: %d bytes\n",
-				cache_type ? "CACHE" : "ICACHE",
-				thread_cache_size);
-			pr_warn("Page Size: %lu bytes\n", PAGE_SIZE);
-			panic("Potential cache aliasing detected");
-		}
-	}
-}
-
-#else
-
-void check_for_cache_aliasing(int thread_id)
-{
-	return;
-}
-
-#endif