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, 211 deletions

diff --git a/arch/tile/kernel/mcount_64.S b/arch/tile/kernel/mcount_64.S
deleted file mode 100644
index 6c6702451962..000000000000
--- a/arch/tile/kernel/mcount_64.S
+++ /dev/null
@@ -1,211 +0,0 @@
-/*
- * Copyright 2012 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.
- *
- * TILE-Gx specific __mcount support
- */
-
-#include <linux/linkage.h>
-#include <asm/ftrace.h>
-
-#define REGSIZE 8
-
-	.text
-	.global __mcount
-
-	.macro	MCOUNT_SAVE_REGS
-	addli	sp, sp, -REGSIZE
-	{
-	 st     sp, lr
-	 addli	r29, sp, - (12 * REGSIZE)
-	}
-	{
-	 addli	sp, sp, - (13 * REGSIZE)
-	 st     r29, sp
-	}
-	addli	r29, r29, REGSIZE
-	{ st	r29, r0; addli	r29, r29, REGSIZE }
-	{ st	r29, r1; addli	r29, r29, REGSIZE }
-	{ st	r29, r2; addli	r29, r29, REGSIZE }
-	{ st	r29, r3; addli	r29, r29, REGSIZE }
-	{ st	r29, r4; addli	r29, r29, REGSIZE }
-	{ st	r29, r5; addli	r29, r29, REGSIZE }
-	{ st	r29, r6; addli	r29, r29, REGSIZE }
-	{ st	r29, r7; addli	r29, r29, REGSIZE }
-	{ st	r29, r8; addli	r29, r29, REGSIZE }
-	{ st	r29, r9; addli	r29, r29, REGSIZE }
-	{ st	r29, r10; addli	r29, r29, REGSIZE }
-	.endm
-
-	.macro	MCOUNT_RESTORE_REGS
-	addli	r29, sp, (2 * REGSIZE)
-	{ ld	r0, r29; addli	r29, r29, REGSIZE }
-	{ ld	r1, r29; addli	r29, r29, REGSIZE }
-	{ ld	r2, r29; addli	r29, r29, REGSIZE }
-	{ ld	r3, r29; addli	r29, r29, REGSIZE }
-	{ ld	r4, r29; addli	r29, r29, REGSIZE }
-	{ ld	r5, r29; addli	r29, r29, REGSIZE }
-	{ ld	r6, r29; addli	r29, r29, REGSIZE }
-	{ ld	r7, r29; addli	r29, r29, REGSIZE }
-	{ ld	r8, r29; addli	r29, r29, REGSIZE }
-	{ ld	r9, r29; addli	r29, r29, REGSIZE }
-	{ ld	r10, r29; addli	lr, sp, (13 * REGSIZE) }
-	{ ld	lr, lr;  addli	sp, sp, (14 * REGSIZE) }
-	.endm
-
-	.macro  RETURN_BACK
-	{ move	r12, lr; move	lr, r10 }
-	jrp	r12
-	.endm
-
-#ifdef CONFIG_DYNAMIC_FTRACE
-
-	.align	64
-STD_ENTRY(__mcount)
-__mcount:
-	j	ftrace_stub
-STD_ENDPROC(__mcount)
-
-	.align	64
-STD_ENTRY(ftrace_caller)
-	MCOUNT_SAVE_REGS
-
-	/* arg1: self return address */
-	/* arg2: parent's return address */
-	/* arg3: ftrace_ops */
-	/* arg4: regs (but make it NULL) */
-	{ move	r0, lr;  moveli        r2, hw2_last(function_trace_op) }
-	{ move	r1, r10; shl16insli    r2, r2, hw1(function_trace_op) }
-	{ movei	r3, 0;   shl16insli    r2, r2, hw0(function_trace_op) }
-	ld	r2,r2
-
-	.global	ftrace_call
-ftrace_call:
-	/*
-	 * a placeholder for the call to a real tracing function, i.e.
-	 * ftrace_trace_function()
-	 */
-	nop
-
-#ifdef CONFIG_FUNCTION_GRAPH_TRACER
-	.global	ftrace_graph_call
-ftrace_graph_call:
-	/*
-	 * a placeholder for the call to a real tracing function, i.e.
-	 * ftrace_graph_caller()
-	 */
-	nop
-#endif
-	MCOUNT_RESTORE_REGS
-	.global	ftrace_stub
-ftrace_stub:
-	RETURN_BACK
-STD_ENDPROC(ftrace_caller)
-
-#else /* ! CONFIG_DYNAMIC_FTRACE */
-
-	.align	64
-STD_ENTRY(__mcount)
-	{
-	 moveli	r11, hw2_last(ftrace_trace_function)
-	 moveli	r13, hw2_last(ftrace_stub)
-	}
-	{
-	 shl16insli	r11, r11, hw1(ftrace_trace_function)
-	 shl16insli	r13, r13, hw1(ftrace_stub)
-	}
-	{
-	 shl16insli	r11, r11, hw0(ftrace_trace_function)
-	 shl16insli	r13, r13, hw0(ftrace_stub)
-	}
-
-	ld	r11, r11
-	sub	r14, r13, r11
-	bnez	r14, static_trace
-
-#ifdef	CONFIG_FUNCTION_GRAPH_TRACER
-	moveli	r15, hw2_last(ftrace_graph_return)
-	shl16insli	r15, r15, hw1(ftrace_graph_return)
-	shl16insli	r15, r15, hw0(ftrace_graph_return)
-	ld	r15, r15
-	sub	r15, r15, r13
-	bnez	r15, ftrace_graph_caller
-
-	{
-	 moveli	r16, hw2_last(ftrace_graph_entry)
-	 moveli	r17, hw2_last(ftrace_graph_entry_stub)
-	}
-	{
-	 shl16insli	r16, r16, hw1(ftrace_graph_entry)
-	 shl16insli	r17, r17, hw1(ftrace_graph_entry_stub)
-	}
-	{
-	 shl16insli	r16, r16, hw0(ftrace_graph_entry)
-	 shl16insli	r17, r17, hw0(ftrace_graph_entry_stub)
-	}
-	ld	r16, r16
-	sub	r17, r16, r17
-	bnez	r17, ftrace_graph_caller
-
-#endif
-	RETURN_BACK
-
-static_trace:
-	MCOUNT_SAVE_REGS
-
-	/* arg1: self return address */
-	/* arg2: parent's return address */
-	{ move	r0, lr; move	r1, r10 }
-
-	/* call ftrace_trace_function() */
-	jalr	r11
-
-	MCOUNT_RESTORE_REGS
-
-	.global ftrace_stub
-ftrace_stub:
-	RETURN_BACK
-STD_ENDPROC(__mcount)
-
-#endif	/* ! CONFIG_DYNAMIC_FTRACE */
-
-#ifdef CONFIG_FUNCTION_GRAPH_TRACER
-
-STD_ENTRY(ftrace_graph_caller)
-ftrace_graph_caller:
-#ifndef CONFIG_DYNAMIC_FTRACE
-	MCOUNT_SAVE_REGS
-#endif
-
-	/* arg1: Get the location of the parent's return address */
-	addi	r0, sp, 12 * REGSIZE
-	/* arg2: Get self return address */
-	move	r1, lr
-
-	jal prepare_ftrace_return
-
-	MCOUNT_RESTORE_REGS
-	RETURN_BACK
-STD_ENDPROC(ftrace_graph_caller)
-
-	.global return_to_handler
-return_to_handler:
-	MCOUNT_SAVE_REGS
-
-	jal	ftrace_return_to_handler
-	/* restore the real parent address */
-	move	r11, r0
-
-	MCOUNT_RESTORE_REGS
-	jr	r11
-
-#endif /* CONFIG_FUNCTION_GRAPH_TRACER */