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, 64 deletions

diff --git a/arch/tile/kernel/entry.S b/arch/tile/kernel/entry.S
deleted file mode 100644
index 101de132e363..000000000000
--- a/arch/tile/kernel/entry.S
+++ /dev/null
@@ -1,64 +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/linkage.h>
-#include <linux/unistd.h>
-#include <asm/irqflags.h>
-#include <asm/processor.h>
-#include <arch/abi.h>
-#include <arch/spr_def.h>
-
-#ifdef __tilegx__
-#define bnzt bnezt
-#endif
-
-STD_ENTRY(current_text_addr)
-	{ move r0, lr; jrp lr }
-	STD_ENDPROC(current_text_addr)
-
-STD_ENTRY(KBacktraceIterator_init_current)
-	{ move r2, lr; lnk r1 }
-	{ move r4, r52; addli r1, r1, KBacktraceIterator_init_current - . }
-	{ move r3, sp; j _KBacktraceIterator_init_current }
-	jrp lr   /* keep backtracer happy */
-	STD_ENDPROC(KBacktraceIterator_init_current)
-
-/* Loop forever on a nap during SMP boot. */
-STD_ENTRY(smp_nap)
-	nap
-	nop       /* avoid provoking the icache prefetch with a jump */
-	j smp_nap /* we are not architecturally guaranteed not to exit nap */
-	jrp lr    /* clue in the backtracer */
-	STD_ENDPROC(smp_nap)
-
-/*
- * Enable interrupts racelessly and then nap until interrupted.
- * Architecturally, we are guaranteed that enabling interrupts via
- * mtspr to INTERRUPT_CRITICAL_SECTION only interrupts at the next PC.
- * This function's _cpu_idle_nap address is special; see intvec.S.
- * When interrupted at _cpu_idle_nap, we bump the PC forward 8, and
- * as a result return to the function that called _cpu_idle().
- */
-STD_ENTRY_SECTION(_cpu_idle, .cpuidle.text)
-	movei r1, 1
-	IRQ_ENABLE_LOAD(r2, r3)
-	mtspr INTERRUPT_CRITICAL_SECTION, r1
-	IRQ_ENABLE_APPLY(r2, r3)       /* unmask, but still with ICS set */
-	mtspr INTERRUPT_CRITICAL_SECTION, zero
-	.global _cpu_idle_nap
-_cpu_idle_nap:
-	nap
-	nop       /* avoid provoking the icache prefetch with a jump */
-	jrp lr
-	STD_ENDPROC(_cpu_idle)