arch: remove blackfin port

The Analog Devices Blackfin port was added in 2007 and was rather
active for a while, but all work on it has come to a standstill
over time, as Analog have changed their product line-up.

Aaron Wu confirmed that the architecture port is no longer relevant,
and multiple people suggested removing blackfin independently because
of some of its oddities like a non-working SMP port, and the amount of
duplication between the chip variants, which cause extra work when
doing cross-architecture changes.

Link: https://docs.blackfin.uclinux.org/
Acked-by: Aaron Wu <Aaron.Wu@analog.com>
Acked-by: Bryan Wu <cooloney@gmail.com>
Cc: Steven Miao <realmz6@gmail.com>
Cc: Mike Frysinger <vapier@chromium.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 0 insertions, 155 deletions

diff --git a/arch/blackfin/kernel/fixed_code.S b/arch/blackfin/kernel/fixed_code.S
deleted file mode 100644
index 0565917f23ba..000000000000
--- a/arch/blackfin/kernel/fixed_code.S
+++ /dev/null
@@ -1,155 +0,0 @@
-/*
- * This file contains sequences of code that will be copied to a
- * fixed location, defined in <asm/fixed_code.h>.  The interrupt
- * handlers ensure that these sequences appear to be atomic when
- * executed from userspace.
- * These are aligned to 16 bytes, so that we have some space to replace
- * these sequences with something else (e.g. kernel traps if we ever do
- * BF561 SMP).
- *
- * Copyright 2007-2008 Analog Devices Inc.
- *
- * Licensed under the GPL-2 or later.
- */
-
-#include <linux/linkage.h>
-#include <linux/init.h>
-#include <linux/unistd.h>
-#include <asm/entry.h>
-
-__INIT
-
-ENTRY(_fixed_code_start)
-
-.align 16
-ENTRY(_sigreturn_stub)
-	P0 = __NR_rt_sigreturn;
-	EXCPT 0;
-	/* Speculative execution paranoia.  */
-0:	JUMP.S 0b;
-ENDPROC (_sigreturn_stub)
-
-.align 16
-	/*
-	 * Atomic swap, 8 bit.
-	 * Inputs:	P0: memory address to use
-	 *		R1: value to store
-	 * Output:	R0: old contents of the memory address, zero extended.
-	 */
-ENTRY(_atomic_xchg32)
-	R0 = [P0];
-	[P0] = R1;
-	rts;
-ENDPROC (_atomic_xchg32)
-
-.align 16
-	/*
-	 * Compare and swap, 32 bit.
-	 * Inputs:	P0: memory address to use
-	 *		R1: compare value
-	 *		R2: new value to store
-	 * The new value is stored if the contents of the memory
-	 * address is equal to the compare value.
-	 * Output:	R0: old contents of the memory address.
-	 */
-ENTRY(_atomic_cas32)
-	R0 = [P0];
-	CC = R0 == R1;
-	IF !CC JUMP 1f;
-	[P0] = R2;
-1:
-	rts;
-ENDPROC (_atomic_cas32)
-
-.align 16
-	/*
-	 * Atomic add, 32 bit.
-	 * Inputs:	P0: memory address to use
-	 *		R0: value to add
-	 * Outputs:	R0: new contents of the memory address.
-	 *		R1: previous contents of the memory address.
-	 */
-ENTRY(_atomic_add32)
-	R1 = [P0];
-	R0 = R1 + R0;
-	[P0] = R0;
-	rts;
-ENDPROC (_atomic_add32)
-
-.align 16
-	/*
-	 * Atomic sub, 32 bit.
-	 * Inputs:	P0: memory address to use
-	 *		R0: value to subtract
-	 * Outputs:	R0: new contents of the memory address.
-	 *		R1: previous contents of the memory address.
-	 */
-ENTRY(_atomic_sub32)
-	R1 = [P0];
-	R0 = R1 - R0;
-	[P0] = R0;
-	rts;
-ENDPROC (_atomic_sub32)
-
-.align 16
-	/*
-	 * Atomic ior, 32 bit.
-	 * Inputs:	P0: memory address to use
-	 *		R0: value to ior
-	 * Outputs:	R0: new contents of the memory address.
-	 *		R1: previous contents of the memory address.
-	 */
-ENTRY(_atomic_ior32)
-	R1 = [P0];
-	R0 = R1 | R0;
-	[P0] = R0;
-	rts;
-ENDPROC (_atomic_ior32)
-
-.align 16
-	/*
-	 * Atomic and, 32 bit.
-	 * Inputs:	P0: memory address to use
-	 *		R0: value to and
-	 * Outputs:	R0: new contents of the memory address.
-	 *		R1: previous contents of the memory address.
-	 */
-ENTRY(_atomic_and32)
-	R1 = [P0];
-	R0 = R1 & R0;
-	[P0] = R0;
-	rts;
-ENDPROC (_atomic_and32)
-
-.align 16
-	/*
-	 * Atomic xor, 32 bit.
-	 * Inputs:	P0: memory address to use
-	 *		R0: value to xor
-	 * Outputs:	R0: new contents of the memory address.
-	 *		R1: previous contents of the memory address.
-	 */
-ENTRY(_atomic_xor32)
-	R1 = [P0];
-	R0 = R1 ^ R0;
-	[P0] = R0;
-	rts;
-ENDPROC (_atomic_xor32)
-
-.align 16
-	/*
-	 * safe_user_instruction
-	 * Four NOPS are enough to allow the pipeline to speculativily load
-	 * execute anything it wants. After that, things have gone bad, and
-	 * we are stuck - so panic. Since we might be in user space, we can't
-	 * call panic, so just cause a unhandled exception, this should cause
-	 * a dump of the trace buffer so we can tell were we are, and a reboot
-	 */
-ENTRY(_safe_user_instruction)
-	NOP; NOP; NOP; NOP;
-	EXCPT 0x4;
-ENDPROC(_safe_user_instruction)
-
-ENTRY(_fixed_code_end)
-
-__FINIT