1 files changed, 0 insertions, 588 deletions

diff --git a/arch/metag/kernel/dma.c b/arch/metag/kernel/dma.c
deleted file mode 100644
index f0ab3a4..0000000
--- a/arch/metag/kernel/dma.c
+++ /dev/null
@@ -1,588 +0,0 @@
-/*
- *  Meta version derived from arch/powerpc/lib/dma-noncoherent.c
- *    Copyright (C) 2008 Imagination Technologies Ltd.
- *
- *  PowerPC version derived from arch/arm/mm/consistent.c
- *    Copyright (C) 2001 Dan Malek (dmalek@jlc.net)
- *
- *  Copyright (C) 2000 Russell King
- *
- * Consistent memory allocators.  Used for DMA devices that want to
- * share uncached memory with the processor core.  The function return
- * is the virtual address and 'dma_handle' is the physical address.
- * Mostly stolen from the ARM port, with some changes for PowerPC.
- *						-- Dan
- *
- * Reorganized to get rid of the arch-specific consistent_* functions
- * and provide non-coherent implementations for the DMA API. -Matt
- *
- * Added in_interrupt() safe dma_alloc_coherent()/dma_free_coherent()
- * implementation. This is pulled straight from ARM and barely
- * modified. -Matt
- *
- * 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/sched.h>
-#include <linux/kernel.h>
-#include <linux/errno.h>
-#include <linux/export.h>
-#include <linux/string.h>
-#include <linux/types.h>
-#include <linux/highmem.h>
-#include <linux/dma-mapping.h>
-#include <linux/slab.h>
-
-#include <asm/tlbflush.h>
-#include <asm/mmu.h>
-
-#define CONSISTENT_OFFSET(x)	(((unsigned long)(x) - CONSISTENT_START) \
-					>> PAGE_SHIFT)
-
-static u64 get_coherent_dma_mask(struct device *dev)
-{
-	u64 mask = ~0ULL;
-
-	if (dev) {
-		mask = dev->coherent_dma_mask;
-
-		/*
-		 * Sanity check the DMA mask - it must be non-zero, and
-		 * must be able to be satisfied by a DMA allocation.
-		 */
-		if (mask == 0) {
-			dev_warn(dev, "coherent DMA mask is unset\n");
-			return 0;
-		}
-	}
-
-	return mask;
-}
-/*
- * This is the page table (2MB) covering uncached, DMA consistent allocations
- */
-static pte_t *consistent_pte;
-static DEFINE_SPINLOCK(consistent_lock);
-
-/*
- * VM region handling support.
- *
- * This should become something generic, handling VM region allocations for
- * vmalloc and similar (ioremap, module space, etc).
- *
- * I envisage vmalloc()'s supporting vm_struct becoming:
- *
- *  struct vm_struct {
- *    struct metag_vm_region	region;
- *    unsigned long	flags;
- *    struct page	**pages;
- *    unsigned int	nr_pages;
- *    unsigned long	phys_addr;
- *  };
- *
- * get_vm_area() would then call metag_vm_region_alloc with an appropriate
- * struct metag_vm_region head (eg):
- *
- *  struct metag_vm_region vmalloc_head = {
- *	.vm_list	= LIST_HEAD_INIT(vmalloc_head.vm_list),
- *	.vm_start	= VMALLOC_START,
- *	.vm_end		= VMALLOC_END,
- *  };
- *
- * However, vmalloc_head.vm_start is variable (typically, it is dependent on
- * the amount of RAM found at boot time.)  I would imagine that get_vm_area()
- * would have to initialise this each time prior to calling
- * metag_vm_region_alloc().
- */
-struct metag_vm_region {
-	struct list_head vm_list;
-	unsigned long vm_start;
-	unsigned long vm_end;
-	struct page		*vm_pages;
-	int			vm_active;
-};
-
-static struct metag_vm_region consistent_head = {
-	.vm_list = LIST_HEAD_INIT(consistent_head.vm_list),
-	.vm_start = CONSISTENT_START,
-	.vm_end = CONSISTENT_END,
-};
-
-static struct metag_vm_region *metag_vm_region_alloc(struct metag_vm_region
-						     *head, size_t size,
-						     gfp_t gfp)
-{
-	unsigned long addr = head->vm_start, end = head->vm_end - size;
-	unsigned long flags;
-	struct metag_vm_region *c, *new;
-
-	new = kmalloc(sizeof(struct metag_vm_region), gfp);
-	if (!new)
-		goto out;
-
-	spin_lock_irqsave(&consistent_lock, flags);
-
-	list_for_each_entry(c, &head->vm_list, vm_list) {
-		if ((addr + size) < addr)
-			goto nospc;
-		if ((addr + size) <= c->vm_start)
-			goto found;
-		addr = c->vm_end;
-		if (addr > end)
-			goto nospc;
-	}
-
-found:
-	/*
-	 * Insert this entry _before_ the one we found.
-	 */
-	list_add_tail(&new->vm_list, &c->vm_list);
-	new->vm_start = addr;
-	new->vm_end = addr + size;
-	new->vm_active = 1;
-
-	spin_unlock_irqrestore(&consistent_lock, flags);
-	return new;
-
-nospc:
-	spin_unlock_irqrestore(&consistent_lock, flags);
-	kfree(new);
-out:
-	return NULL;
-}
-
-static struct metag_vm_region *metag_vm_region_find(struct metag_vm_region
-						    *head, unsigned long addr)
-{
-	struct metag_vm_region *c;
-
-	list_for_each_entry(c, &head->vm_list, vm_list) {
-		if (c->vm_active && c->vm_start == addr)
-			goto out;
-	}
-	c = NULL;
-out:
-	return c;
-}
-
-/*
- * Allocate DMA-coherent memory space and return both the kernel remapped
- * virtual and bus address for that space.
- */
-static void *metag_dma_alloc(struct device *dev, size_t size,
-		dma_addr_t *handle, gfp_t gfp, unsigned long attrs)
-{
-	struct page *page;
-	struct metag_vm_region *c;
-	unsigned long order;
-	u64 mask = get_coherent_dma_mask(dev);
-	u64 limit;
-
-	if (!consistent_pte) {
-		pr_err("%s: not initialised\n", __func__);
-		dump_stack();
-		return NULL;
-	}
-
-	if (!mask)
-		goto no_page;
-	size = PAGE_ALIGN(size);
-	limit = (mask + 1) & ~mask;
-	if ((limit && size >= limit)
-	    || size >= (CONSISTENT_END - CONSISTENT_START)) {
-		pr_warn("coherent allocation too big (requested %#x mask %#Lx)\n",
-			size, mask);
-		return NULL;
-	}
-
-	order = get_order(size);
-
-	if (mask != 0xffffffff)
-		gfp |= GFP_DMA;
-
-	page = alloc_pages(gfp, order);
-	if (!page)
-		goto no_page;
-
-	/*
-	 * Invalidate any data that might be lurking in the
-	 * kernel direct-mapped region for device DMA.
-	 */
-	{
-		void *kaddr = page_address(page);
-		memset(kaddr, 0, size);
-		flush_dcache_region(kaddr, size);
-	}
-
-	/*
-	 * Allocate a virtual address in the consistent mapping region.
-	 */
-	c = metag_vm_region_alloc(&consistent_head, size,
-				  gfp & ~(__GFP_DMA | __GFP_HIGHMEM));
-	if (c) {
-		unsigned long vaddr = c->vm_start;
-		pte_t *pte = consistent_pte + CONSISTENT_OFFSET(vaddr);
-		struct page *end = page + (1 << order);
-
-		c->vm_pages = page;
-		split_page(page, order);
-
-		/*
-		 * Set the "dma handle"
-		 */
-		*handle = page_to_bus(page);
-
-		do {
-			BUG_ON(!pte_none(*pte));
-
-			SetPageReserved(page);
-			set_pte_at(&init_mm, vaddr,
-				   pte, mk_pte(page,
-					       pgprot_writecombine
-					       (PAGE_KERNEL)));
-			page++;
-			pte++;
-			vaddr += PAGE_SIZE;
-		} while (size -= PAGE_SIZE);
-
-		/*
-		 * Free the otherwise unused pages.
-		 */
-		while (page < end) {
-			__free_page(page);
-			page++;
-		}
-
-		return (void *)c->vm_start;
-	}
-
-	if (page)
-		__free_pages(page, order);
-no_page:
-	return NULL;
-}
-
-/*
- * free a page as defined by the above mapping.
- */
-static void metag_dma_free(struct device *dev, size_t size, void *vaddr,
-		dma_addr_t dma_handle, unsigned long attrs)
-{
-	struct metag_vm_region *c;
-	unsigned long flags, addr;
-	pte_t *ptep;
-
-	size = PAGE_ALIGN(size);
-
-	spin_lock_irqsave(&consistent_lock, flags);
-
-	c = metag_vm_region_find(&consistent_head, (unsigned long)vaddr);
-	if (!c)
-		goto no_area;
-
-	c->vm_active = 0;
-	if ((c->vm_end - c->vm_start) != size) {
-		pr_err("%s: freeing wrong coherent size (%ld != %d)\n",
-		       __func__, c->vm_end - c->vm_start, size);
-		dump_stack();
-		size = c->vm_end - c->vm_start;
-	}
-
-	ptep = consistent_pte + CONSISTENT_OFFSET(c->vm_start);
-	addr = c->vm_start;
-	do {
-		pte_t pte = ptep_get_and_clear(&init_mm, addr, ptep);
-		unsigned long pfn;
-
-		ptep++;
-		addr += PAGE_SIZE;
-
-		if (!pte_none(pte) && pte_present(pte)) {
-			pfn = pte_pfn(pte);
-
-			if (pfn_valid(pfn)) {
-				struct page *page = pfn_to_page(pfn);
-				__free_reserved_page(page);
-				continue;
-			}
-		}
-
-		pr_crit("%s: bad page in kernel page table\n",
-			__func__);
-	} while (size -= PAGE_SIZE);
-
-	flush_tlb_kernel_range(c->vm_start, c->vm_end);
-
-	list_del(&c->vm_list);
-
-	spin_unlock_irqrestore(&consistent_lock, flags);
-
-	kfree(c);
-	return;
-
-no_area:
-	spin_unlock_irqrestore(&consistent_lock, flags);
-	pr_err("%s: trying to free invalid coherent area: %p\n",
-	       __func__, vaddr);
-	dump_stack();
-}
-
-static int metag_dma_mmap(struct device *dev, struct vm_area_struct *vma,
-		void *cpu_addr, dma_addr_t dma_addr, size_t size,
-		unsigned long attrs)
-{
-	unsigned long flags, user_size, kern_size;
-	struct metag_vm_region *c;
-	int ret = -ENXIO;
-
-	if (attrs & DMA_ATTR_WRITE_COMBINE)
-		vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
-	else
-		vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
-
-	user_size = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
-
-	spin_lock_irqsave(&consistent_lock, flags);
-	c = metag_vm_region_find(&consistent_head, (unsigned long)cpu_addr);
-	spin_unlock_irqrestore(&consistent_lock, flags);
-
-	if (c) {
-		unsigned long off = vma->vm_pgoff;
-
-		kern_size = (c->vm_end - c->vm_start) >> PAGE_SHIFT;
-
-		if (off < kern_size &&
-		    user_size <= (kern_size - off)) {
-			ret = remap_pfn_range(vma, vma->vm_start,
-					      page_to_pfn(c->vm_pages) + off,
-					      user_size << PAGE_SHIFT,
-					      vma->vm_page_prot);
-		}
-	}
-
-
-	return ret;
-}
-
-/*
- * Initialise the consistent memory allocation.
- */
-static int __init dma_alloc_init(void)
-{
-	pgd_t *pgd, *pgd_k;
-	pud_t *pud, *pud_k;
-	pmd_t *pmd, *pmd_k;
-	pte_t *pte;
-	int ret = 0;
-
-	do {
-		int offset = pgd_index(CONSISTENT_START);
-		pgd = pgd_offset(&init_mm, CONSISTENT_START);
-		pud = pud_alloc(&init_mm, pgd, CONSISTENT_START);
-		pmd = pmd_alloc(&init_mm, pud, CONSISTENT_START);
-		WARN_ON(!pmd_none(*pmd));
-
-		pte = pte_alloc_kernel(pmd, CONSISTENT_START);
-		if (!pte) {
-			pr_err("%s: no pte tables\n", __func__);
-			ret = -ENOMEM;
-			break;
-		}
-
-		pgd_k = ((pgd_t *) mmu_get_base()) + offset;
-		pud_k = pud_offset(pgd_k, CONSISTENT_START);
-		pmd_k = pmd_offset(pud_k, CONSISTENT_START);
-		set_pmd(pmd_k, *pmd);
-
-		consistent_pte = pte;
-	} while (0);
-
-	return ret;
-}
-early_initcall(dma_alloc_init);
-
-/*
- * make an area consistent to devices.
- */
-static void dma_sync_for_device(void *vaddr, size_t size, int dma_direction)
-{
-	/*
-	 * Ensure any writes get through the write combiner. This is necessary
-	 * even with DMA_FROM_DEVICE, or the write may dirty the cache after
-	 * we've invalidated it and get written back during the DMA.
-	 */
-
-	barrier();
-
-	switch (dma_direction) {
-	case DMA_BIDIRECTIONAL:
-		/*
-		 * Writeback to ensure the device can see our latest changes and
-		 * so that we have no dirty lines, and invalidate the cache
-		 * lines too in preparation for receiving the buffer back
-		 * (dma_sync_for_cpu) later.
-		 */
-		flush_dcache_region(vaddr, size);
-		break;
-	case DMA_TO_DEVICE:
-		/*
-		 * Writeback to ensure the device can see our latest changes.
-		 * There's no need to invalidate as the device shouldn't write
-		 * to the buffer.
-		 */
-		writeback_dcache_region(vaddr, size);
-		break;
-	case DMA_FROM_DEVICE:
-		/*
-		 * Invalidate to ensure we have no dirty lines that could get
-		 * written back during the DMA. It's also safe to flush
-		 * (writeback) here if necessary.
-		 */
-		invalidate_dcache_region(vaddr, size);
-		break;
-	case DMA_NONE:
-		BUG();
-	}
-
-	wmb();
-}
-
-/*
- * make an area consistent to the core.
- */
-static void dma_sync_for_cpu(void *vaddr, size_t size, int dma_direction)
-{
-	/*
-	 * Hardware L2 cache prefetch doesn't occur across 4K physical
-	 * boundaries, however according to Documentation/DMA-API-HOWTO.txt
-	 * kmalloc'd memory is DMA'able, so accesses in nearby memory could
-	 * trigger a cache fill in the DMA buffer.
-	 *
-	 * This should never cause dirty lines, so a flush or invalidate should
-	 * be safe to allow us to see data from the device.
-	 */
-	if (_meta_l2c_pf_is_enabled()) {
-		switch (dma_direction) {
-		case DMA_BIDIRECTIONAL:
-		case DMA_FROM_DEVICE:
-			invalidate_dcache_region(vaddr, size);
-			break;
-		case DMA_TO_DEVICE:
-			/* The device shouldn't have written to the buffer */
-			break;
-		case DMA_NONE:
-			BUG();
-		}
-	}
-
-	rmb();
-}
-
-static dma_addr_t metag_dma_map_page(struct device *dev, struct page *page,
-		unsigned long offset, size_t size,
-		enum dma_data_direction direction, unsigned long attrs)
-{
-	if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
-		dma_sync_for_device((void *)(page_to_phys(page) + offset),
-				    size, direction);
-	return page_to_phys(page) + offset;
-}
-
-static void metag_dma_unmap_page(struct device *dev, dma_addr_t dma_address,
-		size_t size, enum dma_data_direction direction,
-		unsigned long attrs)
-{
-	if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
-		dma_sync_for_cpu(phys_to_virt(dma_address), size, direction);
-}
-
-static int metag_dma_map_sg(struct device *dev, struct scatterlist *sglist,
-		int nents, enum dma_data_direction direction,
-		unsigned long attrs)
-{
-	struct scatterlist *sg;
-	int i;
-
-	for_each_sg(sglist, sg, nents, i) {
-		BUG_ON(!sg_page(sg));
-
-		sg->dma_address = sg_phys(sg);
-
-		if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
-			continue;
-
-		dma_sync_for_device(sg_virt(sg), sg->length, direction);
-	}
-
-	return nents;
-}
-
-
-static void metag_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
-		int nhwentries, enum dma_data_direction direction,
-		unsigned long attrs)
-{
-	struct scatterlist *sg;
-	int i;
-
-	for_each_sg(sglist, sg, nhwentries, i) {
-		BUG_ON(!sg_page(sg));
-
-		sg->dma_address = sg_phys(sg);
-
-		if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
-			continue;
-
-		dma_sync_for_cpu(sg_virt(sg), sg->length, direction);
-	}
-}
-
-static void metag_dma_sync_single_for_cpu(struct device *dev,
-		dma_addr_t dma_handle, size_t size,
-		enum dma_data_direction direction)
-{
-	dma_sync_for_cpu(phys_to_virt(dma_handle), size, direction);
-}
-
-static void metag_dma_sync_single_for_device(struct device *dev,
-		dma_addr_t dma_handle, size_t size,
-		enum dma_data_direction direction)
-{
-	dma_sync_for_device(phys_to_virt(dma_handle), size, direction);
-}
-
-static void metag_dma_sync_sg_for_cpu(struct device *dev,
-		struct scatterlist *sglist, int nelems,
-		enum dma_data_direction direction)
-{
-	int i;
-	struct scatterlist *sg;
-
-	for_each_sg(sglist, sg, nelems, i)
-		dma_sync_for_cpu(sg_virt(sg), sg->length, direction);
-}
-
-static void metag_dma_sync_sg_for_device(struct device *dev,
-		struct scatterlist *sglist, int nelems,
-		enum dma_data_direction direction)
-{
-	int i;
-	struct scatterlist *sg;
-
-	for_each_sg(sglist, sg, nelems, i)
-		dma_sync_for_device(sg_virt(sg), sg->length, direction);
-}
-
-const struct dma_map_ops metag_dma_ops = {
-	.alloc			= metag_dma_alloc,
-	.free			= metag_dma_free,
-	.map_page		= metag_dma_map_page,
-	.map_sg			= metag_dma_map_sg,
-	.sync_single_for_device	= metag_dma_sync_single_for_device,
-	.sync_single_for_cpu	= metag_dma_sync_single_for_cpu,
-	.sync_sg_for_cpu	= metag_dma_sync_sg_for_cpu,
-	.mmap			= metag_dma_mmap,
-};
-EXPORT_SYMBOL(metag_dma_ops);