arch: remove tile port

The Tile architecture port was added by Chris Metcalf in 2010, and
maintained until early 2018 when he orphaned it due to his departure
from Mellanox, and nobody else stepped up to maintain it. The product
line is still around in the form of the BlueField SoC, but no longer
uses the Tile architecture.

There are also still products for sale with Tile-GX SoCs, notably the
Mikrotik CCR router family. The products all use old (linux-3.3) kernels
with lots of patches and won't be upgraded by their manufacturers. There
have been efforts to port both OpenWRT and Debian to these, but both
projects have stalled and are very unlikely to be continued in the future.

Given that we are reasonably sure that nobody is still using the port
with an upstream kernel any more, it seems better to remove it now while
the port is in a good shape than to let it bitrot for a few years first.

Cc: Chris Metcalf <chris.d.metcalf@gmail.com>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Link: http://www.mellanox.com/page/npu_multicore_overview
Link: https://jenkins.debian.net/view/rebootstrap/job/rebootstrap_tilegx_gcc7/
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 0 insertions, 87 deletions

diff --git a/arch/tile/include/asm/irq.h b/arch/tile/include/asm/irq.h
deleted file mode 100644
index 1fa1f2544ff9..000000000000
--- a/arch/tile/include/asm/irq.h
+++ /dev/null
@@ -1,87 +0,0 @@
-/*
- * Copyright 2010 Tilera Corporation. All Rights Reserved.
- *
- *   This program is free software; you can redistribute it and/or
- *   modify it under the terms of the GNU General Public License
- *   as published by the Free Software Foundation, version 2.
- *
- *   This program is distributed in the hope that it will be useful, but
- *   WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
- *   NON INFRINGEMENT.  See the GNU General Public License for
- *   more details.
- */
-
-#ifndef _ASM_TILE_IRQ_H
-#define _ASM_TILE_IRQ_H
-
-#include <linux/hardirq.h>
-
-/* The hypervisor interface provides 32 IRQs. */
-#define NR_IRQS			32
-
-/* IRQ numbers used for linux IPIs. */
-#define IRQ_RESCHEDULE	0
-/* Interrupts for dynamic allocation start at 1. Let the core allocate irq0 */
-#define NR_IRQS_LEGACY	1
-
-#define irq_canonicalize(irq)   (irq)
-
-void ack_bad_irq(unsigned int irq);
-
-/*
- * Different ways of handling interrupts.  Tile interrupts are always
- * per-cpu; there is no global interrupt controller to implement
- * enable/disable.  Most onboard devices can send their interrupts to
- * many tiles at the same time, and Tile-specific drivers know how to
- * deal with this.
- *
- * However, generic devices (usually PCIE based, sometimes GPIO)
- * expect that interrupts will fire on a single core at a time and
- * that the irq can be enabled or disabled from any core at any time.
- * We implement this by directing such interrupts to a single core.
- *
- * One added wrinkle is that PCI interrupts can be either
- * hardware-cleared (legacy interrupts) or software cleared (MSI).
- * Other generic device systems (GPIO) are always software-cleared.
- *
- * The enums below are used by drivers for onboard devices, including
- * the internals of PCI root complex and GPIO.  They allow the driver
- * to tell the generic irq code what kind of interrupt is mapped to a
- * particular IRQ number.
- */
-enum {
-	/* per-cpu interrupt; use enable/disable_percpu_irq() to mask */
-	TILE_IRQ_PERCPU,
-	/* global interrupt, hardware responsible for clearing. */
-	TILE_IRQ_HW_CLEAR,
-	/* global interrupt, software responsible for clearing. */
-	TILE_IRQ_SW_CLEAR,
-};
-
-
-/*
- * Paravirtualized drivers should call this when they dynamically
- * allocate a new IRQ or discover an IRQ that was pre-allocated by the
- * hypervisor for use with their particular device.  This gives the
- * IRQ subsystem an opportunity to do interrupt-type-specific
- * initialization.
- *
- * ISSUE: We should modify this API so that registering anything
- * except percpu interrupts also requires providing callback methods
- * for enabling and disabling the interrupt.  This would allow the
- * generic IRQ code to proxy enable/disable_irq() calls back into the
- * PCI subsystem, which in turn could enable or disable the interrupt
- * at the PCI shim.
- */
-void tile_irq_activate(unsigned int irq, int tile_irq_type);
-
-void setup_irq_regs(void);
-
-#ifdef __tilegx__
-void arch_trigger_cpumask_backtrace(const struct cpumask *mask,
-				    bool exclude_self);
-#define arch_trigger_cpumask_backtrace arch_trigger_cpumask_backtrace
-#endif
-
-#endif /* _ASM_TILE_IRQ_H */