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>

3 files changed, 0 insertions, 325 deletions

diff --git a/arch/avr32/oprofile/Makefile b/arch/avr32/oprofile/Makefile
deleted file mode 100644
index e0eb520..0000000
--- a/arch/avr32/oprofile/Makefile
+++ /dev/null
@@ -1,8 +0,0 @@
-obj-$(CONFIG_OPROFILE) += oprofile.o
-
-oprofile-y		:= $(addprefix ../../../drivers/oprofile/,	\
-				oprof.o cpu_buffer.o buffer_sync.o	\
-				event_buffer.o oprofile_files.o		\
-				oprofilefs.o oprofile_stats.o		\
-				timer_int.o)
-oprofile-y		+= op_model_avr32.o backtrace.o
diff --git a/arch/avr32/oprofile/backtrace.c b/arch/avr32/oprofile/backtrace.c
deleted file mode 100644
index 29cf2f1..0000000
--- a/arch/avr32/oprofile/backtrace.c
+++ /dev/null
@@ -1,81 +0,0 @@
-/*
- * AVR32 specific backtracing code for oprofile
- *
- * Copyright 2008 Weinmann GmbH
- *
- * Author: Nikolaus Voss <n.voss@weinmann.de>
- *
- * Based on i386 oprofile backtrace code by John Levon and David Smith
- *
- * 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/oprofile.h>
-#include <linux/ptrace.h>
-#include <linux/uaccess.h>
-
-/* The first two words of each frame on the stack look like this if we have
- * frame pointers */
-struct frame_head {
-	unsigned long lr;
-	struct frame_head *fp;
-};
-
-/* copied from arch/avr32/kernel/process.c */
-static inline int valid_stack_ptr(struct thread_info *tinfo, unsigned long p)
-{
-	return (p > (unsigned long)tinfo)
-		&& (p < (unsigned long)tinfo + THREAD_SIZE - 3);
-}
-
-/* copied from arch/x86/oprofile/backtrace.c */
-static struct frame_head *dump_user_backtrace(struct frame_head *head)
-{
-	struct frame_head bufhead[2];
-
-	/* Also check accessibility of one struct frame_head beyond */
-	if (!access_ok(VERIFY_READ, head, sizeof(bufhead)))
-		return NULL;
-	if (__copy_from_user_inatomic(bufhead, head, sizeof(bufhead)))
-		return NULL;
-
-	oprofile_add_trace(bufhead[0].lr);
-
-	/* frame pointers should strictly progress back up the stack
-	 * (towards higher addresses) */
-	if (bufhead[0].fp <= head)
-		return NULL;
-
-	return bufhead[0].fp;
-}
-
-void avr32_backtrace(struct pt_regs * const regs, unsigned int depth)
-{
-	/* Get first frame pointer */
-	struct frame_head *head = (struct frame_head *)(regs->r7);
-
-	if (!user_mode(regs)) {
-#ifdef CONFIG_FRAME_POINTER
-		/*
-		 * Traverse the kernel stack from frame to frame up to
-		 * "depth" steps.
-		 */
-		while (depth-- && valid_stack_ptr(task_thread_info(current),
-						  (unsigned long)head)) {
-			oprofile_add_trace(head->lr);
-			if (head->fp <= head)
-				break;
-			head = head->fp;
-		}
-#endif
-	} else {
-		/* Assume we have frame pointers in user mode process */
-		while (depth-- && head)
-			head = dump_user_backtrace(head);
-	}
-}
-
-
diff --git a/arch/avr32/oprofile/op_model_avr32.c b/arch/avr32/oprofile/op_model_avr32.c
deleted file mode 100644
index 08308be..0000000
--- a/arch/avr32/oprofile/op_model_avr32.c
+++ /dev/null
@@ -1,236 +0,0 @@
-/*
- * AVR32 Performance Counter Driver
- *
- * Copyright (C) 2005-2007 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.
- *
- * Author: Ronny Pedersen
- */
-#include <linux/errno.h>
-#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <linux/oprofile.h>
-#include <linux/sched.h>
-#include <linux/types.h>
-
-#include <asm/sysreg.h>
-
-#define AVR32_PERFCTR_IRQ_GROUP	0
-#define AVR32_PERFCTR_IRQ_LINE	1
-
-void avr32_backtrace(struct pt_regs * const regs, unsigned int depth);
-
-enum { PCCNT, PCNT0, PCNT1, NR_counter };
-
-struct avr32_perf_counter {
-	unsigned long	enabled;
-	unsigned long	event;
-	unsigned long	count;
-	unsigned long	unit_mask;
-	unsigned long	kernel;
-	unsigned long	user;
-
-	u32		ie_mask;
-	u32		flag_mask;
-};
-
-static struct avr32_perf_counter counter[NR_counter] = {
-	{
-		.ie_mask	= SYSREG_BIT(IEC),
-		.flag_mask	= SYSREG_BIT(FC),
-	}, {
-		.ie_mask	= SYSREG_BIT(IE0),
-		.flag_mask	= SYSREG_BIT(F0),
-	}, {
-		.ie_mask	= SYSREG_BIT(IE1),
-		.flag_mask	= SYSREG_BIT(F1),
-	},
-};
-
-static void avr32_perf_counter_reset(void)
-{
-	/* Reset all counter and disable/clear all interrupts */
-	sysreg_write(PCCR, (SYSREG_BIT(PCCR_R)
-				| SYSREG_BIT(PCCR_C)
-				| SYSREG_BIT(FC)
-				| SYSREG_BIT(F0)
-				| SYSREG_BIT(F1)));
-}
-
-static irqreturn_t avr32_perf_counter_interrupt(int irq, void *dev_id)
-{
-	struct avr32_perf_counter *ctr = dev_id;
-	struct pt_regs *regs;
-	u32 pccr;
-
-	if (likely(!(intc_get_pending(AVR32_PERFCTR_IRQ_GROUP)
-					& (1 << AVR32_PERFCTR_IRQ_LINE))))
-		return IRQ_NONE;
-
-	regs = get_irq_regs();
-	pccr = sysreg_read(PCCR);
-
-	/* Clear the interrupt flags we're about to handle */
-	sysreg_write(PCCR, pccr);
-
-	/* PCCNT */
-	if (ctr->enabled && (pccr & ctr->flag_mask)) {
-		sysreg_write(PCCNT, -ctr->count);
-		oprofile_add_sample(regs, PCCNT);
-	}
-	ctr++;
-	/* PCNT0 */
-	if (ctr->enabled && (pccr & ctr->flag_mask)) {
-		sysreg_write(PCNT0, -ctr->count);
-		oprofile_add_sample(regs, PCNT0);
-	}
-	ctr++;
-	/* PCNT1 */
-	if (ctr->enabled && (pccr & ctr->flag_mask)) {
-		sysreg_write(PCNT1, -ctr->count);
-		oprofile_add_sample(regs, PCNT1);
-	}
-
-	return IRQ_HANDLED;
-}
-
-static int avr32_perf_counter_create_files(struct dentry *root)
-{
-	struct dentry *dir;
-	unsigned int i;
-	char filename[4];
-
-	for (i = 0; i < NR_counter; i++) {
-		snprintf(filename, sizeof(filename), "%u", i);
-		dir = oprofilefs_mkdir(root, filename);
-
-		oprofilefs_create_ulong(dir, "enabled",
-				&counter[i].enabled);
-		oprofilefs_create_ulong(dir, "event",
-				&counter[i].event);
-		oprofilefs_create_ulong(dir, "count",
-				&counter[i].count);
-
-		/* Dummy entries */
-		oprofilefs_create_ulong(dir, "kernel",
-				&counter[i].kernel);
-		oprofilefs_create_ulong(dir, "user",
-				&counter[i].user);
-		oprofilefs_create_ulong(dir, "unit_mask",
-				&counter[i].unit_mask);
-	}
-
-	return 0;
-}
-
-static int avr32_perf_counter_setup(void)
-{
-	struct avr32_perf_counter *ctr;
-	u32 pccr;
-	int ret;
-	int i;
-
-	pr_debug("avr32_perf_counter_setup\n");
-
-	if (sysreg_read(PCCR) & SYSREG_BIT(PCCR_E)) {
-		printk(KERN_ERR
-			"oprofile: setup: perf counter already enabled\n");
-		return -EBUSY;
-	}
-
-	ret = request_irq(AVR32_PERFCTR_IRQ_GROUP,
-			avr32_perf_counter_interrupt, IRQF_SHARED,
-			"oprofile", counter);
-	if (ret)
-		return ret;
-
-	avr32_perf_counter_reset();
-
-	pccr = 0;
-	for (i = PCCNT; i < NR_counter; i++) {
-		ctr = &counter[i];
-		if (!ctr->enabled)
-			continue;
-
-		pr_debug("enabling counter %d...\n", i);
-
-		pccr |= ctr->ie_mask;
-
-		switch (i) {
-		case PCCNT:
-			/* PCCNT always counts cycles, so no events */
-			sysreg_write(PCCNT, -ctr->count);
-			break;
-		case PCNT0:
-			pccr |= SYSREG_BF(CONF0, ctr->event);
-			sysreg_write(PCNT0, -ctr->count);
-			break;
-		case PCNT1:
-			pccr |= SYSREG_BF(CONF1, ctr->event);
-			sysreg_write(PCNT1, -ctr->count);
-			break;
-		}
-	}
-
-	pr_debug("oprofile: writing 0x%x to PCCR...\n", pccr);
-
-	sysreg_write(PCCR, pccr);
-
-	return 0;
-}
-
-static void avr32_perf_counter_shutdown(void)
-{
-	pr_debug("avr32_perf_counter_shutdown\n");
-
-	avr32_perf_counter_reset();
-	free_irq(AVR32_PERFCTR_IRQ_GROUP, counter);
-}
-
-static int avr32_perf_counter_start(void)
-{
-	pr_debug("avr32_perf_counter_start\n");
-
-	sysreg_write(PCCR, sysreg_read(PCCR) | SYSREG_BIT(PCCR_E));
-
-	return 0;
-}
-
-static void avr32_perf_counter_stop(void)
-{
-	pr_debug("avr32_perf_counter_stop\n");
-
-	sysreg_write(PCCR, sysreg_read(PCCR) & ~SYSREG_BIT(PCCR_E));
-}
-
-static struct oprofile_operations avr32_perf_counter_ops __initdata = {
-	.create_files	= avr32_perf_counter_create_files,
-	.setup		= avr32_perf_counter_setup,
-	.shutdown	= avr32_perf_counter_shutdown,
-	.start		= avr32_perf_counter_start,
-	.stop		= avr32_perf_counter_stop,
-	.cpu_type	= "avr32",
-};
-
-int __init oprofile_arch_init(struct oprofile_operations *ops)
-{
-	if (!(current_cpu_data.features & AVR32_FEATURE_PCTR))
-		return -ENODEV;
-
-	memcpy(ops, &avr32_perf_counter_ops,
-			sizeof(struct oprofile_operations));
-
-	ops->backtrace = avr32_backtrace;
-
-	printk(KERN_INFO "oprofile: using AVR32 performance monitoring.\n");
-
-	return 0;
-}
-
-void oprofile_arch_exit(void)
-{
-
-}