avr32: remove support for AVR32 architecture

This patch drops support for AVR32 architecture from the Linux kernel.

The AVR32 architecture is not keeping up with the development of the
kernel, and since it shares so much of the drivers with Atmel ARM SoC,
it is starting to hinder these drivers to develop swiftly.

Also, all AVR32 AP7 SoC processors are end of lifed from Atmel (now
Microchip).

Finally, the GCC toolchain is stuck at version 4.2.x, and has not
received any patches since the last release from Atmel;
4.2.4-atmel.1.1.3.avr32linux.1. When building kernel v4.10, this
toolchain is no longer able to properly link the network stack.

Haavard and I have came to the conclusion that we feel keeping AVR32 on
life support offers more obstacles for Atmel ARMs, than it gives joy to
AVR32 users. I also suspect there are very few AVR32 users left today,
if anybody at all.

Signed-off-by: Hans-Christian Noren Egtvedt <egtvedt@samfundet.no>
Signed-off-by: Håvard Skinnemoen <hskinnemoen@gmail.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Acked-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>

1 files changed, 0 insertions, 375 deletions

diff --git a/arch/avr32/mm/tlb.c b/arch/avr32/mm/tlb.c
deleted file mode 100644
index 0da23109f817..000000000000
--- a/arch/avr32/mm/tlb.c
+++ /dev/null
@@ -1,375 +0,0 @@
-/*
- * AVR32 TLB operations
- *
- * Copyright (C) 2004-2006 Atmel Corporation
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-#include <linux/mm.h>
-
-#include <asm/mmu_context.h>
-
-/* TODO: Get the correct number from the CONFIG1 system register */
-#define NR_TLB_ENTRIES 32
-
-static void show_dtlb_entry(unsigned int index)
-{
-	u32 tlbehi, tlbehi_save, tlbelo, mmucr, mmucr_save;
-	unsigned long flags;
-
-	local_irq_save(flags);
-	mmucr_save = sysreg_read(MMUCR);
-	tlbehi_save = sysreg_read(TLBEHI);
-	mmucr = SYSREG_BFINS(DRP, index, mmucr_save);
-	sysreg_write(MMUCR, mmucr);
-
-	__builtin_tlbr();
-	cpu_sync_pipeline();
-
-	tlbehi = sysreg_read(TLBEHI);
-	tlbelo = sysreg_read(TLBELO);
-
-	printk("%2u: %c %c %02x   %05x %05x %o  %o  %c %c %c %c\n",
-	       index,
-	       SYSREG_BFEXT(TLBEHI_V, tlbehi) ? '1' : '0',
-	       SYSREG_BFEXT(G, tlbelo) ? '1' : '0',
-	       SYSREG_BFEXT(ASID, tlbehi),
-	       SYSREG_BFEXT(VPN, tlbehi) >> 2,
-	       SYSREG_BFEXT(PFN, tlbelo) >> 2,
-	       SYSREG_BFEXT(AP, tlbelo),
-	       SYSREG_BFEXT(SZ, tlbelo),
-	       SYSREG_BFEXT(TLBELO_C, tlbelo) ? 'C' : ' ',
-	       SYSREG_BFEXT(B, tlbelo) ? 'B' : ' ',
-	       SYSREG_BFEXT(W, tlbelo) ? 'W' : ' ',
-	       SYSREG_BFEXT(TLBELO_D, tlbelo) ? 'D' : ' ');
-
-	sysreg_write(MMUCR, mmucr_save);
-	sysreg_write(TLBEHI, tlbehi_save);
-	cpu_sync_pipeline();
-	local_irq_restore(flags);
-}
-
-void dump_dtlb(void)
-{
-	unsigned int i;
-
-	printk("ID  V G ASID VPN   PFN   AP SZ C B W D\n");
-	for (i = 0; i < NR_TLB_ENTRIES; i++)
-		show_dtlb_entry(i);
-}
-
-static void update_dtlb(unsigned long address, pte_t pte)
-{
-	u32 tlbehi;
-	u32 mmucr;
-
-	/*
-	 * We're not changing the ASID here, so no need to flush the
-	 * pipeline.
-	 */
-	tlbehi = sysreg_read(TLBEHI);
-	tlbehi = SYSREG_BF(ASID, SYSREG_BFEXT(ASID, tlbehi));
-	tlbehi |= address & MMU_VPN_MASK;
-	tlbehi |= SYSREG_BIT(TLBEHI_V);
-	sysreg_write(TLBEHI, tlbehi);
-
-	/* Does this mapping already exist? */
-	__builtin_tlbs();
-	mmucr = sysreg_read(MMUCR);
-
-	if (mmucr & SYSREG_BIT(MMUCR_N)) {
-		/* Not found -- pick a not-recently-accessed entry */
-		unsigned int rp;
-		u32 tlbar = sysreg_read(TLBARLO);
-
-		rp = 32 - fls(tlbar);
-		if (rp == 32) {
-			rp = 0;
-			sysreg_write(TLBARLO, -1L);
-		}
-
-		mmucr = SYSREG_BFINS(DRP, rp, mmucr);
-		sysreg_write(MMUCR, mmucr);
-	}
-
-	sysreg_write(TLBELO, pte_val(pte) & _PAGE_FLAGS_HARDWARE_MASK);
-
-	/* Let's go */
-	__builtin_tlbw();
-}
-
-void update_mmu_cache(struct vm_area_struct *vma,
-		      unsigned long address, pte_t *ptep)
-{
-	unsigned long flags;
-
-	/* ptrace may call this routine */
-	if (vma && current->active_mm != vma->vm_mm)
-		return;
-
-	local_irq_save(flags);
-	update_dtlb(address, *ptep);
-	local_irq_restore(flags);
-}
-
-static void __flush_tlb_page(unsigned long asid, unsigned long page)
-{
-	u32 mmucr, tlbehi;
-
-	/*
-	 * Caller is responsible for masking out non-PFN bits in page
-	 * and changing the current ASID if necessary. This means that
-	 * we don't need to flush the pipeline after writing TLBEHI.
-	 */
-	tlbehi = page | asid;
-	sysreg_write(TLBEHI, tlbehi);
-
-	__builtin_tlbs();
-	mmucr = sysreg_read(MMUCR);
-
-	if (!(mmucr & SYSREG_BIT(MMUCR_N))) {
-		unsigned int entry;
-		u32 tlbarlo;
-
-		/* Clear the "valid" bit */
-		sysreg_write(TLBEHI, tlbehi);
-
-		/* mark the entry as "not accessed" */
-		entry = SYSREG_BFEXT(DRP, mmucr);
-		tlbarlo = sysreg_read(TLBARLO);
-		tlbarlo |= (0x80000000UL >> entry);
-		sysreg_write(TLBARLO, tlbarlo);
-
-		/* update the entry with valid bit clear */
-		__builtin_tlbw();
-	}
-}
-
-void flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
-{
-	if (vma->vm_mm && vma->vm_mm->context != NO_CONTEXT) {
-		unsigned long flags, asid;
-		unsigned long saved_asid = MMU_NO_ASID;
-
-		asid = vma->vm_mm->context & MMU_CONTEXT_ASID_MASK;
-		page &= PAGE_MASK;
-
-		local_irq_save(flags);
-		if (vma->vm_mm != current->mm) {
-			saved_asid = get_asid();
-			set_asid(asid);
-		}
-
-		__flush_tlb_page(asid, page);
-
-		if (saved_asid != MMU_NO_ASID)
-			set_asid(saved_asid);
-		local_irq_restore(flags);
-	}
-}
-
-void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
-		     unsigned long end)
-{
-	struct mm_struct *mm = vma->vm_mm;
-
-	if (mm->context != NO_CONTEXT) {
-		unsigned long flags;
-		int size;
-
-		local_irq_save(flags);
-		size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
-
-		if (size > (MMU_DTLB_ENTRIES / 4)) { /* Too many entries to flush */
-			mm->context = NO_CONTEXT;
-			if (mm == current->mm)
-				activate_context(mm);
-		} else {
-			unsigned long asid;
-			unsigned long saved_asid;
-
-			asid = mm->context & MMU_CONTEXT_ASID_MASK;
-			saved_asid = MMU_NO_ASID;
-
-			start &= PAGE_MASK;
-			end += (PAGE_SIZE - 1);
-			end &= PAGE_MASK;
-
-			if (mm != current->mm) {
-				saved_asid = get_asid();
-				set_asid(asid);
-			}
-
-			while (start < end) {
-				__flush_tlb_page(asid, start);
-				start += PAGE_SIZE;
-			}
-			if (saved_asid != MMU_NO_ASID)
-				set_asid(saved_asid);
-		}
-		local_irq_restore(flags);
-	}
-}
-
-/*
- * This function depends on the pages to be flushed having the G
- * (global) bit set in their pte. This is true for all
- * PAGE_KERNEL(_RO) pages.
- */
-void flush_tlb_kernel_range(unsigned long start, unsigned long end)
-{
-	unsigned long flags;
-	int size;
-
-	size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
-	if (size > (MMU_DTLB_ENTRIES / 4)) { /* Too many entries to flush */
-		flush_tlb_all();
-	} else {
-		unsigned long asid;
-
-		local_irq_save(flags);
-		asid = get_asid();
-
-		start &= PAGE_MASK;
-		end += (PAGE_SIZE - 1);
-		end &= PAGE_MASK;
-
-		while (start < end) {
-			__flush_tlb_page(asid, start);
-			start += PAGE_SIZE;
-		}
-		local_irq_restore(flags);
-	}
-}
-
-void flush_tlb_mm(struct mm_struct *mm)
-{
-	/* Invalidate all TLB entries of this process by getting a new ASID */
-	if (mm->context != NO_CONTEXT) {
-		unsigned long flags;
-
-		local_irq_save(flags);
-		mm->context = NO_CONTEXT;
-		if (mm == current->mm)
-			activate_context(mm);
-		local_irq_restore(flags);
-	}
-}
-
-void flush_tlb_all(void)
-{
-	unsigned long flags;
-
-	local_irq_save(flags);
-	sysreg_write(MMUCR, sysreg_read(MMUCR) | SYSREG_BIT(MMUCR_I));
-	local_irq_restore(flags);
-}
-
-#ifdef CONFIG_PROC_FS
-
-#include <linux/seq_file.h>
-#include <linux/proc_fs.h>
-#include <linux/init.h>
-
-static void *tlb_start(struct seq_file *tlb, loff_t *pos)
-{
-	static unsigned long tlb_index;
-
-	if (*pos >= NR_TLB_ENTRIES)
-		return NULL;
-
-	tlb_index = 0;
-	return &tlb_index;
-}
-
-static void *tlb_next(struct seq_file *tlb, void *v, loff_t *pos)
-{
-	unsigned long *index = v;
-
-	if (*index >= NR_TLB_ENTRIES - 1)
-		return NULL;
-
-	++*pos;
-	++*index;
-	return index;
-}
-
-static void tlb_stop(struct seq_file *tlb, void *v)
-{
-
-}
-
-static int tlb_show(struct seq_file *tlb, void *v)
-{
-	unsigned int tlbehi, tlbehi_save, tlbelo, mmucr, mmucr_save;
-	unsigned long flags;
-	unsigned long *index = v;
-
-	if (*index == 0)
-		seq_puts(tlb, "ID  V G ASID VPN   PFN   AP SZ C B W D\n");
-
-	BUG_ON(*index >= NR_TLB_ENTRIES);
-
-	local_irq_save(flags);
-	mmucr_save = sysreg_read(MMUCR);
-	tlbehi_save = sysreg_read(TLBEHI);
-	mmucr = SYSREG_BFINS(DRP, *index, mmucr_save);
-	sysreg_write(MMUCR, mmucr);
-
-	/* TLBR might change the ASID */
-	__builtin_tlbr();
-	cpu_sync_pipeline();
-
-	tlbehi = sysreg_read(TLBEHI);
-	tlbelo = sysreg_read(TLBELO);
-
-	sysreg_write(MMUCR, mmucr_save);
-	sysreg_write(TLBEHI, tlbehi_save);
-	cpu_sync_pipeline();
-	local_irq_restore(flags);
-
-	seq_printf(tlb, "%2lu: %c %c %02x   %05x %05x %o  %o  %c %c %c %c\n",
-		   *index,
-		   SYSREG_BFEXT(TLBEHI_V, tlbehi) ? '1' : '0',
-		   SYSREG_BFEXT(G, tlbelo) ? '1' : '0',
-		   SYSREG_BFEXT(ASID, tlbehi),
-		   SYSREG_BFEXT(VPN, tlbehi) >> 2,
-		   SYSREG_BFEXT(PFN, tlbelo) >> 2,
-		   SYSREG_BFEXT(AP, tlbelo),
-		   SYSREG_BFEXT(SZ, tlbelo),
-		   SYSREG_BFEXT(TLBELO_C, tlbelo) ? '1' : '0',
-		   SYSREG_BFEXT(B, tlbelo) ? '1' : '0',
-		   SYSREG_BFEXT(W, tlbelo) ? '1' : '0',
-		   SYSREG_BFEXT(TLBELO_D, tlbelo) ? '1' : '0');
-
-	return 0;
-}
-
-static const struct seq_operations tlb_ops = {
-	.start		= tlb_start,
-	.next		= tlb_next,
-	.stop		= tlb_stop,
-	.show		= tlb_show,
-};
-
-static int tlb_open(struct inode *inode, struct file *file)
-{
-	return seq_open(file, &tlb_ops);
-}
-
-static const struct file_operations proc_tlb_operations = {
-	.open		= tlb_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= seq_release,
-};
-
-static int __init proctlb_init(void)
-{
-	proc_create("tlb", 0, NULL, &proc_tlb_operations);
-	return 0;
-}
-late_initcall(proctlb_init);
-#endif /* CONFIG_PROC_FS */