metag: Remove arch/metag/

The earliest Meta architecture port of Linux I have a record of was an
import of a Meta port of Linux v2.4.1 in February 2004, which was worked
on significantly over the next few years by Graham Whaley, Will Newton,
Matt Fleming, myself and others.

Eventually the port was merged into mainline in v3.9 in March 2013, not
long after Imagination Technologies bought MIPS Technologies and shifted
its CPU focus over to the MIPS architecture.

As a result, though the port was maintained for a while, kept on life
support for a while longer, and useful for testing a few specific
drivers for which I don't have ready access to the equivalent MIPS
hardware, it is now essentially dead with no users.

It is also stuck using an out-of-tree toolchain based on GCC 4.2.4 which
is no longer maintained, now struggles to build modern kernels due to
toolchain bugs, and doesn't itself build with a modern GCC. The latest
buildroot port is still using an old uClibc snapshot which is no longer
served, and the latest uClibc doesn't build with GCC 4.2.4.

So lets call it a day and drop the Meta architecture port from the
kernel. RIP Meta.

Signed-off-by: James Hogan <jhogan@kernel.org>
Link: https://lkml.kernel.org/r/95906b76-6ce1-3f84-eaba-c29b4ae952eb@roeck-us.net
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Graham Whaley <graham.whaley@gmail.com>
Cc: linux-metag@vger.kernel.org

1 files changed, 0 insertions, 157 deletions

diff --git a/arch/metag/mm/mmu-meta1.c b/arch/metag/mm/mmu-meta1.c
deleted file mode 100644
index 53190b13dc54..000000000000
--- a/arch/metag/mm/mmu-meta1.c
+++ /dev/null
@@ -1,157 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- *  Copyright (C) 2005,2006,2007,2008,2009 Imagination Technologies
- *
- * Meta 1 MMU handling code.
- *
- */
-
-#include <linux/sched.h>
-#include <linux/mm.h>
-#include <linux/io.h>
-
-#include <asm/mmu.h>
-
-#define DM3_BASE (LINSYSDIRECT_BASE + (MMCU_DIRECTMAPn_ADDR_SCALE * 3))
-
-/*
- * This contains the physical address of the top level 2k pgd table.
- */
-static unsigned long mmu_base_phys;
-
-/*
- * Given a physical address, return a mapped virtual address that can be used
- * to access that location.
- * In practice, we use the DirectMap region to make this happen.
- */
-static unsigned long map_addr(unsigned long phys)
-{
-	static unsigned long dm_base = 0xFFFFFFFF;
-	int offset;
-
-	offset = phys - dm_base;
-
-	/* Are we in the current map range ? */
-	if ((offset < 0) || (offset >= MMCU_DIRECTMAPn_ADDR_SCALE)) {
-		/* Calculate new DM area */
-		dm_base = phys & ~(MMCU_DIRECTMAPn_ADDR_SCALE - 1);
-
-		/* Actually map it in! */
-		metag_out32(dm_base, MMCU_DIRECTMAP3_ADDR);
-
-		/* And calculate how far into that area our reference is */
-		offset = phys - dm_base;
-	}
-
-	return DM3_BASE + offset;
-}
-
-/*
- * Return the physical address of the base of our pgd table.
- */
-static inline unsigned long __get_mmu_base(void)
-{
-	unsigned long base_phys;
-	unsigned int stride;
-
-	if (is_global_space(PAGE_OFFSET))
-		stride = 4;
-	else
-		stride = hard_processor_id();	/* [0..3] */
-
-	base_phys = metag_in32(MMCU_TABLE_PHYS_ADDR);
-	base_phys += (0x800 * stride);
-
-	return base_phys;
-}
-
-/* Given a virtual address, return the virtual address of the relevant pgd */
-static unsigned long pgd_entry_addr(unsigned long virt)
-{
-	unsigned long pgd_phys;
-	unsigned long pgd_virt;
-
-	if (!mmu_base_phys)
-		mmu_base_phys = __get_mmu_base();
-
-	/*
-	 * Are we trying to map a global address.  If so, then index
-	 * the global pgd table instead of our local one.
-	 */
-	if (is_global_space(virt)) {
-		/* Scale into 2gig map */
-		virt &= ~0x80000000;
-	}
-
-	/* Base of the pgd table plus our 4Meg entry, 4bytes each */
-	pgd_phys = mmu_base_phys + ((virt >> PGDIR_SHIFT) * 4);
-
-	pgd_virt = map_addr(pgd_phys);
-
-	return pgd_virt;
-}
-
-/* Given a virtual address, return the virtual address of the relevant pte */
-static unsigned long pgtable_entry_addr(unsigned long virt)
-{
-	unsigned long pgtable_phys;
-	unsigned long pgtable_virt, pte_virt;
-
-	/* Find the physical address of the 4MB page table*/
-	pgtable_phys = metag_in32(pgd_entry_addr(virt)) & MMCU_ENTRY_ADDR_BITS;
-
-	/* Map it to a virtual address */
-	pgtable_virt = map_addr(pgtable_phys);
-
-	/* And index into it for our pte */
-	pte_virt = pgtable_virt + ((virt >> PAGE_SHIFT) & 0x3FF) * 4;
-
-	return pte_virt;
-}
-
-unsigned long mmu_read_first_level_page(unsigned long vaddr)
-{
-	return metag_in32(pgd_entry_addr(vaddr));
-}
-
-unsigned long mmu_read_second_level_page(unsigned long vaddr)
-{
-	return metag_in32(pgtable_entry_addr(vaddr));
-}
-
-unsigned long mmu_get_base(void)
-{
-	static unsigned long __base;
-
-	/* Find the base of our MMU pgd table */
-	if (!__base)
-		__base = pgd_entry_addr(0);
-
-	return __base;
-}
-
-void __init mmu_init(unsigned long mem_end)
-{
-	unsigned long entry, addr;
-	pgd_t *p_swapper_pg_dir;
-
-	/*
-	 * Now copy over any MMU pgd entries already in the mmu page tables
-	 * over to our root init process (swapper_pg_dir) map.  This map is
-	 * then inherited by all other processes, which means all processes
-	 * inherit a map of the kernel space.
-	 */
-	addr = PAGE_OFFSET;
-	entry = pgd_index(PAGE_OFFSET);
-	p_swapper_pg_dir = pgd_offset_k(0) + entry;
-
-	while (addr <= META_MEMORY_LIMIT) {
-		unsigned long pgd_entry;
-		/* copy over the current MMU value */
-		pgd_entry = mmu_read_first_level_page(addr);
-		pgd_val(*p_swapper_pg_dir) = pgd_entry;
-
-		p_swapper_pg_dir++;
-		addr += PGDIR_SIZE;
-	}
-}