c6x: remove architecture

The c6x architecture was added to the kernel in 2011 at a time when
running Linux on DSPs was widely seen as the logical evolution.
It appears the trend has gone back to running Linux on Arm based SoCs
with DSP, using a better supported software ecosystem, and having better
real-time behavior for the DSP code. An example of this is TI's own
Keystone2 platform.

The upstream kernel port appears to no longer have any users. Mark
Salter remained avaialable to review patches, but mentioned that
he no longer has access to working hardware himself. Without any
users, it's best to just remove the code completely to reduce the
work for cross-architecture code changes.

Many thanks to Mark for maintaining the code for the past ten years.

Link: https://lore.kernel.org/lkml/41dc7795afda9f776d8cd0d3075f776cf586e97c.camel@redhat.com/
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 0 insertions, 64 deletions

diff --git a/arch/c6x/include/asm/delay.h b/arch/c6x/include/asm/delay.h
deleted file mode 100644
index 455fc713ae54..000000000000
--- a/arch/c6x/include/asm/delay.h
+++ /dev/null
@@ -1,64 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- *  Port on Texas Instruments TMS320C6x architecture
- *
- *  Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
- *  Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
- */
-#ifndef _ASM_C6X_DELAY_H
-#define _ASM_C6X_DELAY_H
-
-#include <linux/kernel.h>
-
-extern unsigned int ticks_per_ns_scaled;
-
-static inline void __delay(unsigned long loops)
-{
-	uint32_t tmp;
-
-	/* 6 cycles per loop */
-	asm volatile ("        mv    .s1  %0,%1\n"
-		      "0: [%1] b     .s1  0b\n"
-		      "        add   .l1  -6,%0,%0\n"
-		      "        cmplt .l1  1,%0,%1\n"
-		      "        nop   3\n"
-		      : "+a"(loops), "=A"(tmp));
-}
-
-static inline void _c6x_tickdelay(unsigned int x)
-{
-	uint32_t cnt, endcnt;
-
-	asm volatile ("        mvc   .s2   TSCL,%0\n"
-		      "        add   .s2x  %0,%1,%2\n"
-		      " ||     mvk   .l2   1,B0\n"
-		      "0: [B0] b     .s2   0b\n"
-		      "        mvc   .s2   TSCL,%0\n"
-		      "        sub   .s2   %0,%2,%0\n"
-		      "        cmpgt .l2   0,%0,B0\n"
-		      "        nop   2\n"
-		      : "=b"(cnt), "+a"(x), "=b"(endcnt) : : "B0");
-}
-
-/* use scaled math to avoid slow division */
-#define C6X_NDELAY_SCALE 10
-
-static inline void _ndelay(unsigned int n)
-{
-	_c6x_tickdelay((ticks_per_ns_scaled * n) >> C6X_NDELAY_SCALE);
-}
-
-static inline void _udelay(unsigned int n)
-{
-	while (n >= 10) {
-		_ndelay(10000);
-		n -= 10;
-	}
-	while (n-- > 0)
-		_ndelay(1000);
-}
-
-#define udelay(x) _udelay((unsigned int)(x))
-#define ndelay(x) _ndelay((unsigned int)(x))
-
-#endif /* _ASM_C6X_DELAY_H */