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, 118 deletions

diff --git a/arch/blackfin/lib/ins.S b/arch/blackfin/lib/ins.S
deleted file mode 100644
index d59608deccc1..000000000000
--- a/arch/blackfin/lib/ins.S
+++ /dev/null
@@ -1,118 +0,0 @@
-/*
- * arch/blackfin/lib/ins.S - ins{bwl} using hardware loops
- *
- * Copyright 2004-2008 Analog Devices Inc.
- * Copyright (C) 2005 Bas Vermeulen, BuyWays BV <bas@buyways.nl>
- * Licensed under the GPL-2 or later.
- */
-
-#include <linux/linkage.h>
-#include <asm/blackfin.h>
-
-.align 2
-
-#ifdef CONFIG_IPIPE
-# define DO_CLI \
-	[--sp] = rets; \
-	[--sp] = (P5:0); \
-	sp += -12; \
-	call ___ipipe_disable_root_irqs_hw; \
-	sp += 12; \
-	(P5:0) = [sp++];
-# define CLI_INNER_NOP
-#else
-# define DO_CLI cli R3;
-# define CLI_INNER_NOP nop; nop; nop;
-#endif
-
-#ifdef CONFIG_IPIPE
-# define DO_STI \
-	sp += -12; \
-	call ___ipipe_enable_root_irqs_hw; \
-	sp += 12; \
-2:	rets = [sp++];
-#else
-# define DO_STI 2: sti R3;
-#endif
-
-#ifdef CONFIG_BFIN_INS_LOWOVERHEAD
-# define CLI_OUTER DO_CLI;
-# define STI_OUTER DO_STI;
-# define CLI_INNER 1:
-# if ANOMALY_05000416
-#  define STI_INNER nop; 2: nop;
-# else
-#  define STI_INNER 2:
-# endif
-#else
-# define CLI_OUTER
-# define STI_OUTER
-# define CLI_INNER 1: DO_CLI; CLI_INNER_NOP;
-# define STI_INNER DO_STI;
-#endif
-
-/*
- * Reads on the Blackfin are speculative. In Blackfin terms, this means they
- * can be interrupted at any time (even after they have been issued on to the
- * external bus), and re-issued after the interrupt occurs.
- *
- * If a FIFO is sitting on the end of the read, it will see two reads,
- * when the core only sees one. The FIFO receives the read which is cancelled,
- * and not delivered to the core.
- *
- * To solve this, interrupts are turned off before reads occur to I/O space.
- * There are 3 versions of all these functions
- *  - turns interrupts off every read (higher overhead, but lower latency)
- *  - turns interrupts off every loop (low overhead, but longer latency)
- *  - DMA version, which do not suffer from this issue. DMA versions have
- *      different name (prefixed by dma_ ), and are located in
- *      ../kernel/bfin_dma.c
- * Using the dma related functions are recommended for transferring large
- * buffers in/out of FIFOs.
- */
-
-#define COMMON_INS(func, ops) \
-ENTRY(_ins##func) \
-	P0 = R0;	/* P0 = port */ \
-	CLI_OUTER;	/* 3 instructions before first read access */ \
-	P1 = R1;	/* P1 = address */ \
-	P2 = R2;	/* P2 = count */ \
-	SSYNC; \
- \
-	LSETUP(1f, 2f) LC0 = P2; \
-	CLI_INNER; \
-	ops; \
-	STI_INNER; \
- \
-	STI_OUTER; \
-	RTS; \
-ENDPROC(_ins##func)
-
-COMMON_INS(l, \
-	R0 = [P0]; \
-	[P1++] = R0; \
-)
-
-COMMON_INS(w, \
-	R0 = W[P0]; \
-	W[P1++] = R0; \
-)
-
-COMMON_INS(w_8, \
-	R0 = W[P0]; \
-	B[P1++] = R0; \
-	R0 = R0 >> 8; \
-	B[P1++] = R0; \
-)
-
-COMMON_INS(b, \
-	R0 = B[P0]; \
-	B[P1++] = R0; \
-)
-
-COMMON_INS(l_16, \
-	R0 = [P0]; \
-	W[P1++] = R0; \
-	R0 = R0 >> 16; \
-	W[P1++] = R0; \
-)