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, 139 deletions

diff --git a/arch/tile/include/asm/smp.h b/arch/tile/include/asm/smp.h
deleted file mode 100644
index 735e7f144733..000000000000
--- a/arch/tile/include/asm/smp.h
+++ /dev/null
@@ -1,139 +0,0 @@
-/*
- * 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_SMP_H
-#define _ASM_TILE_SMP_H
-
-#ifdef CONFIG_SMP
-
-#include <asm/processor.h>
-#include <linux/cpumask.h>
-#include <linux/irqreturn.h>
-#include <hv/hypervisor.h>
-
-/* Set up this tile to support receiving hypervisor messages */
-void init_messaging(void);
-
-/* Set up this tile to support receiving device interrupts and IPIs. */
-void init_per_tile_IRQs(void);
-
-/* Send a message to processors specified in mask */
-void send_IPI_many(const struct cpumask *mask, int tag);
-
-/* Send a message to all but the sending processor */
-void send_IPI_allbutself(int tag);
-
-/* Send a message to a specific processor */
-void send_IPI_single(int dest, int tag);
-
-/* Process an IPI message */
-void evaluate_message(int tag);
-
-/* Boot a secondary cpu */
-void online_secondary(void);
-
-/* Topology of the supervisor tile grid, and coordinates of boot processor */
-extern HV_Topology smp_topology;
-
-/* Accessors for grid size */
-#define smp_height		(smp_topology.height)
-#define smp_width		(smp_topology.width)
-
-/* Convenience functions for converting cpu <-> coords. */
-static inline int cpu_x(int cpu)
-{
-	return cpu % smp_width;
-}
-static inline int cpu_y(int cpu)
-{
-	return cpu / smp_width;
-}
-static inline int xy_to_cpu(int x, int y)
-{
-	return y * smp_width + x;
-}
-
-/* Hypervisor message tags sent via the tile send_IPI*() routines. */
-#define MSG_TAG_START_CPU		1
-#define MSG_TAG_STOP_CPU		2
-#define MSG_TAG_CALL_FUNCTION_MANY	3
-#define MSG_TAG_CALL_FUNCTION_SINGLE	4
-#define MSG_TAG_IRQ_WORK		5
-
-/* Hook for the generic smp_call_function_many() routine. */
-static inline void arch_send_call_function_ipi_mask(struct cpumask *mask)
-{
-	send_IPI_many(mask, MSG_TAG_CALL_FUNCTION_MANY);
-}
-
-/* Hook for the generic smp_call_function_single() routine. */
-static inline void arch_send_call_function_single_ipi(int cpu)
-{
-	send_IPI_single(cpu, MSG_TAG_CALL_FUNCTION_SINGLE);
-}
-
-/* Print out the boot string describing which cpus were disabled. */
-void print_disabled_cpus(void);
-
-#else /* !CONFIG_SMP */
-
-#define smp_master_cpu		0
-#define smp_height		1
-#define smp_width		1
-#define cpu_x(cpu)		0
-#define cpu_y(cpu)		0
-#define xy_to_cpu(x, y)		0
-
-#endif /* !CONFIG_SMP */
-
-
-/* Which cpus may be used as the lotar in a page table entry. */
-extern struct cpumask cpu_lotar_map;
-#define cpu_is_valid_lotar(cpu) cpumask_test_cpu((cpu), &cpu_lotar_map)
-
-/* Which processors are used for hash-for-home mapping */
-extern struct cpumask hash_for_home_map;
-
-/* Which cpus can have their cache flushed by hv_flush_remote(). */
-extern struct cpumask cpu_cacheable_map;
-#define cpu_cacheable(cpu) cpumask_test_cpu((cpu), &cpu_cacheable_map)
-
-/* Convert an HV_LOTAR value into a cpu. */
-static inline int hv_lotar_to_cpu(HV_LOTAR lotar)
-{
-	return HV_LOTAR_X(lotar) + (HV_LOTAR_Y(lotar) * smp_width);
-}
-
-/*
- * Extension of <linux/cpumask.h> functionality when you just want
- * to express a mask or suppression or inclusion region without
- * being too concerned about exactly which cpus are valid in that region.
- */
-int bitmap_parselist_crop(const char *bp, unsigned long *maskp, int nmaskbits);
-
-#define cpulist_parse_crop(buf, dst) \
-			__cpulist_parse_crop((buf), (dst), NR_CPUS)
-static inline int __cpulist_parse_crop(const char *buf, struct cpumask *dstp,
-					int nbits)
-{
-	return bitmap_parselist_crop(buf, cpumask_bits(dstp), nbits);
-}
-
-/* Initialize the IPI subsystem. */
-void ipi_init(void);
-
-/* Function for start-cpu message to cause us to jump to. */
-extern unsigned long start_cpu_function_addr;
-
-#endif /* _ASM_TILE_SMP_H */