arch: remove m32r port

The Mitsubishi/Renesas m32r architecture has been around for many years,
but the Linux port has been obsolete for a very long time as well, with
the last significant updates done for linux-2.6.14.

While some m32r microcontrollers are still being marketed by Renesas,
those are apparently no longer possible to support, mainly due to the
lack of an external memory interface.

Hirokazu Takata was the maintainer until the architecture got marked
Orphaned in 2014.

Link: http://www.linux-m32r.org/
Link: https://www.renesas.com/en-eu/products/microcontrollers-microprocessors/m32r.html
Cc: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 0 insertions, 167 deletions

diff --git a/arch/m32r/include/asm/mmu_context.h b/arch/m32r/include/asm/mmu_context.h
deleted file mode 100644
index 8a499d0fb3a2..000000000000
--- a/arch/m32r/include/asm/mmu_context.h
+++ /dev/null
@@ -1,167 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _ASM_M32R_MMU_CONTEXT_H
-#define _ASM_M32R_MMU_CONTEXT_H
-#ifdef __KERNEL__
-
-#include <asm/m32r.h>
-
-#define MMU_CONTEXT_ASID_MASK      (0x000000FF)
-#define MMU_CONTEXT_VERSION_MASK   (0xFFFFFF00)
-#define MMU_CONTEXT_FIRST_VERSION  (0x00000100)
-#define NO_CONTEXT                 (0x00000000)
-
-#ifndef __ASSEMBLY__
-
-#include <linux/atomic.h>
-#include <linux/mm_types.h>
-
-#include <asm/pgalloc.h>
-#include <asm/mmu.h>
-#include <asm/tlbflush.h>
-#include <asm-generic/mm_hooks.h>
-
-/*
- * Cache of MMU context last used.
- */
-#ifndef CONFIG_SMP
-extern unsigned long mmu_context_cache_dat;
-#define mmu_context_cache	mmu_context_cache_dat
-#define mm_context(mm)		mm->context
-#else /* not CONFIG_SMP */
-extern unsigned long mmu_context_cache_dat[];
-#define mmu_context_cache	mmu_context_cache_dat[smp_processor_id()]
-#define mm_context(mm)		mm->context[smp_processor_id()]
-#endif /* not CONFIG_SMP */
-
-#define set_tlb_tag(entry, tag)		(*entry = (tag & PAGE_MASK)|get_asid())
-#define set_tlb_data(entry, data)	(*entry = (data | _PAGE_PRESENT))
-
-#ifdef CONFIG_MMU
-#define enter_lazy_tlb(mm, tsk)	do { } while (0)
-
-static inline void get_new_mmu_context(struct mm_struct *mm)
-{
-	unsigned long mc = ++mmu_context_cache;
-
-	if (!(mc & MMU_CONTEXT_ASID_MASK)) {
-		/* We exhaust ASID of this version.
-		   Flush all TLB and start new cycle. */
-		local_flush_tlb_all();
-		/* Fix version if needed.
-		   Note that we avoid version #0 to distinguish NO_CONTEXT. */
-		if (!mc)
-			mmu_context_cache = mc = MMU_CONTEXT_FIRST_VERSION;
-	}
-	mm_context(mm) = mc;
-}
-
-/*
- * Get MMU context if needed.
- */
-static inline void get_mmu_context(struct mm_struct *mm)
-{
-	if (mm) {
-		unsigned long mc = mmu_context_cache;
-
-		/* Check if we have old version of context.
-		   If it's old, we need to get new context with new version. */
-		if ((mm_context(mm) ^ mc) & MMU_CONTEXT_VERSION_MASK)
-			get_new_mmu_context(mm);
-	}
-}
-
-/*
- * Initialize the context related info for a new mm_struct
- * instance.
- */
-static inline int init_new_context(struct task_struct *tsk,
-	struct mm_struct *mm)
-{
-#ifndef CONFIG_SMP
-	mm->context = NO_CONTEXT;
-#else /* CONFIG_SMP */
-	int num_cpus = num_online_cpus();
-	int i;
-
-	for (i = 0 ; i < num_cpus ; i++)
-		mm->context[i] = NO_CONTEXT;
-#endif /* CONFIG_SMP */
-
-	return 0;
-}
-
-/*
- * Destroy context related info for an mm_struct that is about
- * to be put to rest.
- */
-#define destroy_context(mm)	do { } while (0)
-
-static inline void set_asid(unsigned long asid)
-{
-	*(volatile unsigned long *)MASID = (asid & MMU_CONTEXT_ASID_MASK);
-}
-
-static inline unsigned long get_asid(void)
-{
-	unsigned long asid;
-
-	asid = *(volatile long *)MASID;
-	asid &= MMU_CONTEXT_ASID_MASK;
-
-	return asid;
-}
-
-/*
- * After we have set current->mm to a new value, this activates
- * the context for the new mm so we see the new mappings.
- */
-static inline void activate_context(struct mm_struct *mm)
-{
-	get_mmu_context(mm);
-	set_asid(mm_context(mm) & MMU_CONTEXT_ASID_MASK);
-}
-
-static inline void switch_mm(struct mm_struct *prev,
-	struct mm_struct *next, struct task_struct *tsk)
-{
-#ifdef CONFIG_SMP
-	int cpu = smp_processor_id();
-#endif	/* CONFIG_SMP */
-
-	if (prev != next) {
-#ifdef CONFIG_SMP
-		cpumask_set_cpu(cpu, mm_cpumask(next));
-#endif /* CONFIG_SMP */
-		/* Set MPTB = next->pgd */
-		*(volatile unsigned long *)MPTB = (unsigned long)next->pgd;
-		activate_context(next);
-	}
-#ifdef CONFIG_SMP
-	else
-		if (!cpumask_test_and_set_cpu(cpu, mm_cpumask(next)))
-			activate_context(next);
-#endif /* CONFIG_SMP */
-}
-
-#define deactivate_mm(tsk, mm)	do { } while (0)
-
-#define activate_mm(prev, next)	\
-	switch_mm((prev), (next), NULL)
-
-#else /* not CONFIG_MMU */
-#define get_mmu_context(mm)             do { } while (0)
-#define init_new_context(tsk,mm)        (0)
-#define destroy_context(mm)             do { } while (0)
-#define set_asid(asid)                  do { } while (0)
-#define get_asid()                      (0)
-#define activate_context(mm)            do { } while (0)
-#define switch_mm(prev,next,tsk)        do { } while (0)
-#define deactivate_mm(mm,tsk)           do { } while (0)
-#define activate_mm(prev,next)          do { } while (0)
-#define enter_lazy_tlb(mm,tsk)          do { } while (0)
-#endif /* not CONFIG_MMU */
-
-#endif /* not __ASSEMBLY__ */
-
-#endif /* __KERNEL__ */
-#endif /* _ASM_M32R_MMU_CONTEXT_H */