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, 243 deletions

diff --git a/arch/avr32/mach-at32ap/pm.c b/arch/avr32/mach-at32ap/pm.c
deleted file mode 100644
index db19084..0000000
--- a/arch/avr32/mach-at32ap/pm.c
+++ /dev/null
@@ -1,243 +0,0 @@
-/*
- * AVR32 AP Power Management
- *
- * Copyright (C) 2008 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/io.h>
-#include <linux/suspend.h>
-#include <linux/vmalloc.h>
-
-#include <asm/cacheflush.h>
-#include <asm/sysreg.h>
-
-#include <mach/chip.h>
-#include <mach/pm.h>
-#include <mach/sram.h>
-
-#include "sdramc.h"
-
-#define SRAM_PAGE_FLAGS	(SYSREG_BIT(TLBELO_D) | SYSREG_BF(SZ, 1)	\
-				| SYSREG_BF(AP, 3) | SYSREG_BIT(G))
-
-
-static unsigned long	pm_sram_start;
-static size_t		pm_sram_size;
-static struct vm_struct	*pm_sram_area;
-
-static void (*avr32_pm_enter_standby)(unsigned long sdramc_base);
-static void (*avr32_pm_enter_str)(unsigned long sdramc_base);
-
-/*
- * Must be called with interrupts disabled. Exceptions will be masked
- * on return (i.e. all exceptions will be "unrecoverable".)
- */
-static void *avr32_pm_map_sram(void)
-{
-	unsigned long	vaddr;
-	unsigned long	page_addr;
-	u32		tlbehi;
-	u32		mmucr;
-
-	vaddr = (unsigned long)pm_sram_area->addr;
-	page_addr = pm_sram_start & PAGE_MASK;
-
-	/*
-	 * Mask exceptions and grab the first TLB entry. We won't be
-	 * needing it while sleeping.
-	 */
-	asm volatile("ssrf	%0" : : "i"(SYSREG_EM_OFFSET) : "memory");
-
-	mmucr = sysreg_read(MMUCR);
-	tlbehi = sysreg_read(TLBEHI);
-	sysreg_write(MMUCR, SYSREG_BFINS(DRP, 0, mmucr));
-
-	tlbehi = SYSREG_BF(ASID, SYSREG_BFEXT(ASID, tlbehi));
-	tlbehi |= vaddr & PAGE_MASK;
-	tlbehi |= SYSREG_BIT(TLBEHI_V);
-
-	sysreg_write(TLBELO, page_addr | SRAM_PAGE_FLAGS);
-	sysreg_write(TLBEHI, tlbehi);
-	__builtin_tlbw();
-
-	return (void *)(vaddr + pm_sram_start - page_addr);
-}
-
-/*
- * Must be called with interrupts disabled. Exceptions will be
- * unmasked on return.
- */
-static void avr32_pm_unmap_sram(void)
-{
-	u32	mmucr;
-	u32	tlbehi;
-	u32	tlbarlo;
-
-	/* Going to update TLB entry at index 0 */
-	mmucr = sysreg_read(MMUCR);
-	tlbehi = sysreg_read(TLBEHI);
-	sysreg_write(MMUCR, SYSREG_BFINS(DRP, 0, mmucr));
-
-	/* Clear the "valid" bit */
-	tlbehi = SYSREG_BF(ASID, SYSREG_BFEXT(ASID, tlbehi));
-	sysreg_write(TLBEHI, tlbehi);
-
-	/* Mark it as "not accessed" */
-	tlbarlo = sysreg_read(TLBARLO);
-	sysreg_write(TLBARLO, tlbarlo | 0x80000000U);
-
-	/* Update the TLB */
-	__builtin_tlbw();
-
-	/* Unmask exceptions */
-	asm volatile("csrf	%0" : : "i"(SYSREG_EM_OFFSET) : "memory");
-}
-
-static int avr32_pm_valid_state(suspend_state_t state)
-{
-	switch (state) {
-	case PM_SUSPEND_ON:
-	case PM_SUSPEND_STANDBY:
-	case PM_SUSPEND_MEM:
-		return 1;
-
-	default:
-		return 0;
-	}
-}
-
-static int avr32_pm_enter(suspend_state_t state)
-{
-	u32		lpr_saved;
-	u32		evba_saved;
-	void		*sram;
-
-	switch (state) {
-	case PM_SUSPEND_STANDBY:
-		sram = avr32_pm_map_sram();
-
-		/* Switch to in-sram exception handlers */
-		evba_saved = sysreg_read(EVBA);
-		sysreg_write(EVBA, (unsigned long)sram);
-
-		/*
-		 * Save the LPR register so that we can re-enable
-		 * SDRAM Low Power mode on resume.
-		 */
-		lpr_saved = sdramc_readl(LPR);
-		pr_debug("%s: Entering standby...\n", __func__);
-		avr32_pm_enter_standby(SDRAMC_BASE);
-		sdramc_writel(LPR, lpr_saved);
-
-		/* Switch back to regular exception handlers */
-		sysreg_write(EVBA, evba_saved);
-
-		avr32_pm_unmap_sram();
-		break;
-
-	case PM_SUSPEND_MEM:
-		sram = avr32_pm_map_sram();
-
-		/* Switch to in-sram exception handlers */
-		evba_saved = sysreg_read(EVBA);
-		sysreg_write(EVBA, (unsigned long)sram);
-
-		/*
-		 * Save the LPR register so that we can re-enable
-		 * SDRAM Low Power mode on resume.
-		 */
-		lpr_saved = sdramc_readl(LPR);
-		pr_debug("%s: Entering suspend-to-ram...\n", __func__);
-		avr32_pm_enter_str(SDRAMC_BASE);
-		sdramc_writel(LPR, lpr_saved);
-
-		/* Switch back to regular exception handlers */
-		sysreg_write(EVBA, evba_saved);
-
-		avr32_pm_unmap_sram();
-		break;
-
-	case PM_SUSPEND_ON:
-		pr_debug("%s: Entering idle...\n", __func__);
-		cpu_enter_idle();
-		break;
-
-	default:
-		pr_debug("%s: Invalid suspend state %d\n", __func__, state);
-		goto out;
-	}
-
-	pr_debug("%s: wakeup\n", __func__);
-
-out:
-	return 0;
-}
-
-static const struct platform_suspend_ops avr32_pm_ops = {
-	.valid	= avr32_pm_valid_state,
-	.enter	= avr32_pm_enter,
-};
-
-static unsigned long __init avr32_pm_offset(void *symbol)
-{
-	extern u8 pm_exception[];
-
-	return (unsigned long)symbol - (unsigned long)pm_exception;
-}
-
-static int __init avr32_pm_init(void)
-{
-	extern u8 pm_exception[];
-	extern u8 pm_irq0[];
-	extern u8 pm_standby[];
-	extern u8 pm_suspend_to_ram[];
-	extern u8 pm_sram_end[];
-	void *dst;
-
-	/*
-	 * To keep things simple, we depend on not needing more than a
-	 * single page.
-	 */
-	pm_sram_size = avr32_pm_offset(pm_sram_end);
-	if (pm_sram_size > PAGE_SIZE)
-		goto err;
-
-	pm_sram_start = sram_alloc(pm_sram_size);
-	if (!pm_sram_start)
-		goto err_alloc_sram;
-
-	/* Grab a virtual area we can use later on. */
-	pm_sram_area = get_vm_area(pm_sram_size, VM_IOREMAP);
-	if (!pm_sram_area)
-		goto err_vm_area;
-	pm_sram_area->phys_addr = pm_sram_start;
-
-	local_irq_disable();
-	dst = avr32_pm_map_sram();
-	memcpy(dst, pm_exception, pm_sram_size);
-	flush_dcache_region(dst, pm_sram_size);
-	invalidate_icache_region(dst, pm_sram_size);
-	avr32_pm_unmap_sram();
-	local_irq_enable();
-
-	avr32_pm_enter_standby = dst + avr32_pm_offset(pm_standby);
-	avr32_pm_enter_str = dst + avr32_pm_offset(pm_suspend_to_ram);
-	intc_set_suspend_handler(avr32_pm_offset(pm_irq0));
-
-	suspend_set_ops(&avr32_pm_ops);
-
-	printk("AVR32 AP Power Management enabled\n");
-
-	return 0;
-
-err_vm_area:
-	sram_free(pm_sram_start, pm_sram_size);
-err_alloc_sram:
-err:
-	pr_err("AVR32 Power Management initialization failed\n");
-	return -ENOMEM;
-}
-arch_initcall(avr32_pm_init);