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, 164 deletions

diff --git a/arch/tile/include/asm/pgalloc.h b/arch/tile/include/asm/pgalloc.h
deleted file mode 100644
index 1b902508b664..000000000000
--- a/arch/tile/include/asm/pgalloc.h
+++ /dev/null
@@ -1,164 +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_PGALLOC_H
-#define _ASM_TILE_PGALLOC_H
-
-#include <linux/threads.h>
-#include <linux/mm.h>
-#include <linux/mmzone.h>
-#include <asm/fixmap.h>
-#include <asm/page.h>
-#include <hv/hypervisor.h>
-
-/* Bits for the size of the second-level page table. */
-#define L2_KERNEL_PGTABLE_SHIFT _HV_LOG2_L2_SIZE(HPAGE_SHIFT, PAGE_SHIFT)
-
-/* How big is a kernel L2 page table? */
-#define L2_KERNEL_PGTABLE_SIZE (1UL << L2_KERNEL_PGTABLE_SHIFT)
-
-/* We currently allocate user L2 page tables by page (unlike kernel L2s). */
-#if L2_KERNEL_PGTABLE_SHIFT < PAGE_SHIFT
-#define L2_USER_PGTABLE_SHIFT PAGE_SHIFT
-#else
-#define L2_USER_PGTABLE_SHIFT L2_KERNEL_PGTABLE_SHIFT
-#endif
-
-/* How many pages do we need, as an "order", for a user L2 page table? */
-#define L2_USER_PGTABLE_ORDER (L2_USER_PGTABLE_SHIFT - PAGE_SHIFT)
-
-static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
-{
-#ifdef CONFIG_64BIT
-	set_pte(pmdp, pmd);
-#else
-	set_pte(&pmdp->pud.pgd, pmd.pud.pgd);
-#endif
-}
-
-static inline void pmd_populate_kernel(struct mm_struct *mm,
-				       pmd_t *pmd, pte_t *ptep)
-{
-	set_pmd(pmd, ptfn_pmd(HV_CPA_TO_PTFN(__pa(ptep)),
-			      __pgprot(_PAGE_PRESENT)));
-}
-
-static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
-				pgtable_t page)
-{
-	set_pmd(pmd, ptfn_pmd(HV_CPA_TO_PTFN(PFN_PHYS(page_to_pfn(page))),
-			      __pgprot(_PAGE_PRESENT)));
-}
-
-/*
- * Allocate and free page tables.
- */
-
-extern pgd_t *pgd_alloc(struct mm_struct *mm);
-extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
-
-extern pgtable_t pgtable_alloc_one(struct mm_struct *mm, unsigned long address,
-				   int order);
-extern void pgtable_free(struct mm_struct *mm, struct page *pte, int order);
-
-static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
-				      unsigned long address)
-{
-	return pgtable_alloc_one(mm, address, L2_USER_PGTABLE_ORDER);
-}
-
-static inline void pte_free(struct mm_struct *mm, struct page *pte)
-{
-	pgtable_free(mm, pte, L2_USER_PGTABLE_ORDER);
-}
-
-#define pmd_pgtable(pmd) pmd_page(pmd)
-
-static inline pte_t *
-pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
-{
-	return pfn_to_kaddr(page_to_pfn(pte_alloc_one(mm, address)));
-}
-
-static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
-{
-	BUG_ON((unsigned long)pte & (PAGE_SIZE-1));
-	pte_free(mm, virt_to_page(pte));
-}
-
-extern void __pgtable_free_tlb(struct mmu_gather *tlb, struct page *pte,
-			       unsigned long address, int order);
-static inline void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte,
-				  unsigned long address)
-{
-	__pgtable_free_tlb(tlb, pte, address, L2_USER_PGTABLE_ORDER);
-}
-
-#define check_pgt_cache()	do { } while (0)
-
-/*
- * Get the small-page pte_t lowmem entry for a given pfn.
- * This may or may not be in use, depending on whether the initial
- * huge-page entry for the page has already been shattered.
- */
-pte_t *get_prealloc_pte(unsigned long pfn);
-
-/* During init, we can shatter kernel huge pages if needed. */
-void shatter_pmd(pmd_t *pmd);
-
-/* After init, a more complex technique is required. */
-void shatter_huge_page(unsigned long addr);
-
-#ifdef __tilegx__
-
-#define pud_populate(mm, pud, pmd) \
-  pmd_populate_kernel((mm), (pmd_t *)(pud), (pte_t *)(pmd))
-
-/* Bits for the size of the L1 (intermediate) page table. */
-#define L1_KERNEL_PGTABLE_SHIFT _HV_LOG2_L1_SIZE(HPAGE_SHIFT)
-
-/* How big is a kernel L2 page table? */
-#define L1_KERNEL_PGTABLE_SIZE (1UL << L1_KERNEL_PGTABLE_SHIFT)
-
-/* We currently allocate L1 page tables by page. */
-#if L1_KERNEL_PGTABLE_SHIFT < PAGE_SHIFT
-#define L1_USER_PGTABLE_SHIFT PAGE_SHIFT
-#else
-#define L1_USER_PGTABLE_SHIFT L1_KERNEL_PGTABLE_SHIFT
-#endif
-
-/* How many pages do we need, as an "order", for an L1 page table? */
-#define L1_USER_PGTABLE_ORDER (L1_USER_PGTABLE_SHIFT - PAGE_SHIFT)
-
-static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
-{
-	struct page *p = pgtable_alloc_one(mm, address, L1_USER_PGTABLE_ORDER);
-	return (pmd_t *)page_to_virt(p);
-}
-
-static inline void pmd_free(struct mm_struct *mm, pmd_t *pmdp)
-{
-	pgtable_free(mm, virt_to_page(pmdp), L1_USER_PGTABLE_ORDER);
-}
-
-static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmdp,
-				  unsigned long address)
-{
-	__pgtable_free_tlb(tlb, virt_to_page(pmdp), address,
-			   L1_USER_PGTABLE_ORDER);
-}
-
-#endif /* __tilegx__ */
-
-#endif /* _ASM_TILE_PGALLOC_H */