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, 114 deletions

diff --git a/arch/c6x/include/asm/processor.h b/arch/c6x/include/asm/processor.h
deleted file mode 100644
index 1456f5e11de3..000000000000
--- a/arch/c6x/include/asm/processor.h
+++ /dev/null
@@ -1,114 +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)
- *
- *  Updated for 2.6.34: Mark Salter <msalter@redhat.com>
- */
-#ifndef _ASM_C6X_PROCESSOR_H
-#define _ASM_C6X_PROCESSOR_H
-
-#include <asm/ptrace.h>
-#include <asm/page.h>
-#include <asm/current.h>
-
-/*
- * User space process size. This is mostly meaningless for NOMMU
- * but some C6X processors may have RAM addresses up to 0xFFFFFFFF.
- * Since calls like mmap() can return an address or an error, we
- * have to allow room for error returns when code does something
- * like:
- *
- *       addr = do_mmap(...)
- *       if ((unsigned long)addr >= TASK_SIZE)
- *            ... its an error code, not an address ...
- *
- * Here, we allow for 4096 error codes which means we really can't
- * use the last 4K page on systems with RAM extending all the way
- * to the end of the 32-bit address space.
- */
-#define TASK_SIZE	0xFFFFF000
-
-/*
- * This decides where the kernel will search for a free chunk of vm
- * space during mmap's. We won't be using it
- */
-#define TASK_UNMAPPED_BASE	0
-
-struct thread_struct {
-	unsigned long long b15_14;
-	unsigned long long a15_14;
-	unsigned long long b13_12;
-	unsigned long long a13_12;
-	unsigned long long b11_10;
-	unsigned long long a11_10;
-	unsigned long long ricl_icl;
-	unsigned long  usp;		/* user stack pointer */
-	unsigned long  pc;		/* kernel pc */
-	unsigned long  wchan;
-};
-
-#define INIT_THREAD					\
-{							\
-	.usp = 0,					\
-	.wchan = 0,					\
-}
-
-#define INIT_MMAP { \
-	&init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, \
-	NULL, NULL }
-
-#define task_pt_regs(task) \
-	((struct pt_regs *)(THREAD_START_SP + task_stack_page(task)) - 1)
-
-#define alloc_kernel_stack()	__get_free_page(GFP_KERNEL)
-#define free_kernel_stack(page) free_page((page))
-
-
-/* Forward declaration, a strange C thing */
-struct task_struct;
-
-extern void start_thread(struct pt_regs *regs, unsigned int pc,
-			 unsigned long usp);
-
-/* Free all resources held by a thread. */
-static inline void release_thread(struct task_struct *dead_task)
-{
-}
-
-/*
- * saved kernel SP and DP of a blocked thread.
- */
-#ifdef _BIG_ENDIAN
-#define thread_saved_ksp(tsk) \
-	(*(unsigned long *)&(tsk)->thread.b15_14)
-#define thread_saved_dp(tsk) \
-	(*(((unsigned long *)&(tsk)->thread.b15_14) + 1))
-#else
-#define thread_saved_ksp(tsk) \
-	(*(((unsigned long *)&(tsk)->thread.b15_14) + 1))
-#define thread_saved_dp(tsk) \
-	(*(unsigned long *)&(tsk)->thread.b15_14)
-#endif
-
-extern unsigned long get_wchan(struct task_struct *p);
-
-#define KSTK_EIP(task)	(task_pt_regs(task)->pc)
-#define KSTK_ESP(task)	(task_pt_regs(task)->sp)
-
-#define cpu_relax()		do { } while (0)
-
-extern const struct seq_operations cpuinfo_op;
-
-/* Reset the board */
-#define HARD_RESET_NOW()
-
-extern unsigned int c6x_core_freq;
-
-
-extern void (*c6x_restart)(void);
-extern void (*c6x_halt)(void);
-
-#endif /* ASM_C6X_PROCESSOR_H */