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, 206 deletions

diff --git a/arch/tile/lib/atomic_32.c b/arch/tile/lib/atomic_32.c
deleted file mode 100644
index f8128800dbf5..000000000000
--- a/arch/tile/lib/atomic_32.c
+++ /dev/null
@@ -1,206 +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.
- */
-
-#include <linux/cache.h>
-#include <linux/delay.h>
-#include <linux/uaccess.h>
-#include <linux/module.h>
-#include <linux/mm.h>
-#include <linux/atomic.h>
-#include <arch/chip.h>
-
-/* This page is remapped on startup to be hash-for-home. */
-int atomic_locks[PAGE_SIZE / sizeof(int)] __page_aligned_bss;
-
-int *__atomic_hashed_lock(volatile void *v)
-{
-	/* NOTE: this code must match "sys_cmpxchg" in kernel/intvec_32.S */
-	/*
-	 * Use bits [3, 3 + ATOMIC_HASH_SHIFT) as the lock index.
-	 * Using mm works here because atomic_locks is page aligned.
-	 */
-	unsigned long ptr = __insn_mm((unsigned long)v >> 1,
-				      (unsigned long)atomic_locks,
-				      2, (ATOMIC_HASH_SHIFT + 2) - 1);
-	return (int *)ptr;
-}
-
-#ifdef CONFIG_SMP
-/* Return whether the passed pointer is a valid atomic lock pointer. */
-static int is_atomic_lock(int *p)
-{
-	return p >= &atomic_locks[0] && p < &atomic_locks[ATOMIC_HASH_SIZE];
-}
-
-void __atomic_fault_unlock(int *irqlock_word)
-{
-	BUG_ON(!is_atomic_lock(irqlock_word));
-	BUG_ON(*irqlock_word != 1);
-	*irqlock_word = 0;
-}
-
-#endif /* CONFIG_SMP */
-
-static inline int *__atomic_setup(volatile void *v)
-{
-	/* Issue a load to the target to bring it into cache. */
-	*(volatile int *)v;
-	return __atomic_hashed_lock(v);
-}
-
-int _atomic_xchg(int *v, int n)
-{
-	return __atomic32_xchg(v, __atomic_setup(v), n).val;
-}
-EXPORT_SYMBOL(_atomic_xchg);
-
-int _atomic_xchg_add(int *v, int i)
-{
-	return __atomic32_xchg_add(v, __atomic_setup(v), i).val;
-}
-EXPORT_SYMBOL(_atomic_xchg_add);
-
-int _atomic_xchg_add_unless(int *v, int a, int u)
-{
-	/*
-	 * Note: argument order is switched here since it is easier
-	 * to use the first argument consistently as the "old value"
-	 * in the assembly, as is done for _atomic_cmpxchg().
-	 */
-	return __atomic32_xchg_add_unless(v, __atomic_setup(v), u, a).val;
-}
-EXPORT_SYMBOL(_atomic_xchg_add_unless);
-
-int _atomic_cmpxchg(int *v, int o, int n)
-{
-	return __atomic32_cmpxchg(v, __atomic_setup(v), o, n).val;
-}
-EXPORT_SYMBOL(_atomic_cmpxchg);
-
-unsigned long _atomic_fetch_or(volatile unsigned long *p, unsigned long mask)
-{
-	return __atomic32_fetch_or((int *)p, __atomic_setup(p), mask).val;
-}
-EXPORT_SYMBOL(_atomic_fetch_or);
-
-unsigned long _atomic_fetch_and(volatile unsigned long *p, unsigned long mask)
-{
-	return __atomic32_fetch_and((int *)p, __atomic_setup(p), mask).val;
-}
-EXPORT_SYMBOL(_atomic_fetch_and);
-
-unsigned long _atomic_fetch_andn(volatile unsigned long *p, unsigned long mask)
-{
-	return __atomic32_fetch_andn((int *)p, __atomic_setup(p), mask).val;
-}
-EXPORT_SYMBOL(_atomic_fetch_andn);
-
-unsigned long _atomic_fetch_xor(volatile unsigned long *p, unsigned long mask)
-{
-	return __atomic32_fetch_xor((int *)p, __atomic_setup(p), mask).val;
-}
-EXPORT_SYMBOL(_atomic_fetch_xor);
-
-
-long long _atomic64_xchg(long long *v, long long n)
-{
-	return __atomic64_xchg(v, __atomic_setup(v), n);
-}
-EXPORT_SYMBOL(_atomic64_xchg);
-
-long long _atomic64_xchg_add(long long *v, long long i)
-{
-	return __atomic64_xchg_add(v, __atomic_setup(v), i);
-}
-EXPORT_SYMBOL(_atomic64_xchg_add);
-
-long long _atomic64_xchg_add_unless(long long *v, long long a, long long u)
-{
-	/*
-	 * Note: argument order is switched here since it is easier
-	 * to use the first argument consistently as the "old value"
-	 * in the assembly, as is done for _atomic_cmpxchg().
-	 */
-	return __atomic64_xchg_add_unless(v, __atomic_setup(v), u, a);
-}
-EXPORT_SYMBOL(_atomic64_xchg_add_unless);
-
-long long _atomic64_cmpxchg(long long *v, long long o, long long n)
-{
-	return __atomic64_cmpxchg(v, __atomic_setup(v), o, n);
-}
-EXPORT_SYMBOL(_atomic64_cmpxchg);
-
-long long _atomic64_fetch_and(long long *v, long long n)
-{
-	return __atomic64_fetch_and(v, __atomic_setup(v), n);
-}
-EXPORT_SYMBOL(_atomic64_fetch_and);
-
-long long _atomic64_fetch_or(long long *v, long long n)
-{
-	return __atomic64_fetch_or(v, __atomic_setup(v), n);
-}
-EXPORT_SYMBOL(_atomic64_fetch_or);
-
-long long _atomic64_fetch_xor(long long *v, long long n)
-{
-	return __atomic64_fetch_xor(v, __atomic_setup(v), n);
-}
-EXPORT_SYMBOL(_atomic64_fetch_xor);
-
-/*
- * If any of the atomic or futex routines hit a bad address (not in
- * the page tables at kernel PL) this routine is called.  The futex
- * routines are never used on kernel space, and the normal atomics and
- * bitops are never used on user space.  So a fault on kernel space
- * must be fatal, but a fault on userspace is a futex fault and we
- * need to return -EFAULT.  Note that the context this routine is
- * invoked in is the context of the "_atomic_xxx()" routines called
- * by the functions in this file.
- */
-struct __get_user __atomic_bad_address(int __user *addr)
-{
-	if (unlikely(!access_ok(VERIFY_WRITE, addr, sizeof(int))))
-		panic("Bad address used for kernel atomic op: %p\n", addr);
-	return (struct __get_user) { .err = -EFAULT };
-}
-
-
-void __init __init_atomic_per_cpu(void)
-{
-	/* Validate power-of-two and "bigger than cpus" assumption */
-	BUILD_BUG_ON(ATOMIC_HASH_SIZE & (ATOMIC_HASH_SIZE-1));
-	BUG_ON(ATOMIC_HASH_SIZE < nr_cpu_ids);
-
-	/*
-	 * On TILEPro we prefer to use a single hash-for-home
-	 * page, since this means atomic operations are less
-	 * likely to encounter a TLB fault and thus should
-	 * in general perform faster.  You may wish to disable
-	 * this in situations where few hash-for-home tiles
-	 * are configured.
-	 */
-	BUG_ON((unsigned long)atomic_locks % PAGE_SIZE != 0);
-
-	/* The locks must all fit on one page. */
-	BUILD_BUG_ON(ATOMIC_HASH_SIZE * sizeof(int) > PAGE_SIZE);
-
-	/*
-	 * We use the page offset of the atomic value's address as
-	 * an index into atomic_locks, excluding the low 3 bits.
-	 * That should not produce more indices than ATOMIC_HASH_SIZE.
-	 */
-	BUILD_BUG_ON((PAGE_SIZE >> 3) > ATOMIC_HASH_SIZE);
-}