summaryrefslogtreecommitdiffstats
path: root/arch/frv/mm/dma-alloc.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/frv/mm/dma-alloc.c')
-rw-r--r--arch/frv/mm/dma-alloc.c183
1 files changed, 0 insertions, 183 deletions
diff --git a/arch/frv/mm/dma-alloc.c b/arch/frv/mm/dma-alloc.c
deleted file mode 100644
index e701aa9e6a14..000000000000
--- a/arch/frv/mm/dma-alloc.c
+++ /dev/null
@@ -1,183 +0,0 @@
-/* dma-alloc.c: consistent DMA memory allocation
- *
- * Derived from arch/ppc/mm/cachemap.c
- *
- * PowerPC version derived from arch/arm/mm/consistent.c
- * Copyright (C) 2001 Dan Malek (dmalek@jlc.net)
- *
- * linux/arch/arm/mm/consistent.c
- *
- * 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
- * Modified for 36-bit support. -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/module.h>
-#include <linux/signal.h>
-#include <linux/sched.h>
-#include <linux/kernel.h>
-#include <linux/errno.h>
-#include <linux/string.h>
-#include <linux/types.h>
-#include <linux/ptrace.h>
-#include <linux/mman.h>
-#include <linux/mm.h>
-#include <linux/swap.h>
-#include <linux/stddef.h>
-#include <linux/vmalloc.h>
-#include <linux/init.h>
-#include <linux/pci.h>
-#include <linux/hardirq.h>
-#include <linux/gfp.h>
-
-#include <asm/pgalloc.h>
-#include <asm/io.h>
-#include <asm/mmu_context.h>
-#include <asm/pgtable.h>
-#include <asm/mmu.h>
-#include <linux/uaccess.h>
-#include <asm/smp.h>
-
-static int map_page(unsigned long va, unsigned long pa, pgprot_t prot)
-{
- pgd_t *pge;
- pud_t *pue;
- pmd_t *pme;
- pte_t *pte;
- int err = -ENOMEM;
-
- /* Use upper 10 bits of VA to index the first level map */
- pge = pgd_offset_k(va);
- pue = pud_offset(pge, va);
- pme = pmd_offset(pue, va);
-
- /* Use middle 10 bits of VA to index the second-level map */
- pte = pte_alloc_kernel(pme, va);
- if (pte != 0) {
- err = 0;
- set_pte(pte, mk_pte_phys(pa & PAGE_MASK, prot));
- }
-
- return err;
-}
-
-/*
- * This function will allocate the requested contiguous pages and
- * map them into the kernel's vmalloc() space. This is done so we
- * get unique mapping for these pages, outside of the kernel's 1:1
- * virtual:physical mapping. This is necessary so we can cover large
- * portions of the kernel with single large page TLB entries, and
- * still get unique uncached pages for consistent DMA.
- */
-void *consistent_alloc(gfp_t gfp, size_t size, dma_addr_t *dma_handle)
-{
- struct vm_struct *area;
- unsigned long page, va, pa;
- void *ret;
- int order, err, i;
-
- if (in_interrupt())
- BUG();
-
- /* only allocate page size areas */
- size = PAGE_ALIGN(size);
- order = get_order(size);
-
- page = __get_free_pages(gfp, order);
- if (!page) {
- BUG();
- return NULL;
- }
-
- /* allocate some common virtual space to map the new pages */
- area = get_vm_area(size, VM_ALLOC);
- if (area == 0) {
- free_pages(page, order);
- return NULL;
- }
- va = VMALLOC_VMADDR(area->addr);
- ret = (void *) va;
-
- /* this gives us the real physical address of the first page */
- *dma_handle = pa = virt_to_bus((void *) page);
-
- /* set refcount=1 on all pages in an order>0 allocation so that vfree() will actually free
- * all pages that were allocated.
- */
- if (order > 0) {
- struct page *rpage = virt_to_page(page);
- split_page(rpage, order);
- }
-
- err = 0;
- for (i = 0; i < size && err == 0; i += PAGE_SIZE)
- err = map_page(va + i, pa + i, PAGE_KERNEL_NOCACHE);
-
- if (err) {
- vfree((void *) va);
- return NULL;
- }
-
- /* we need to ensure that there are no cachelines in use, or worse dirty in this area
- * - can't do until after virtual address mappings are created
- */
- frv_cache_invalidate(va, va + size);
-
- return ret;
-}
-
-/*
- * free page(s) as defined by the above mapping.
- */
-void consistent_free(void *vaddr)
-{
- if (in_interrupt())
- BUG();
- vfree(vaddr);
-}
-
-/*
- * make an area consistent.
- */
-void consistent_sync(void *vaddr, size_t size, int direction)
-{
- unsigned long start = (unsigned long) vaddr;
- unsigned long end = start + size;
-
- switch (direction) {
- case PCI_DMA_NONE:
- BUG();
- case PCI_DMA_FROMDEVICE: /* invalidate only */
- frv_cache_invalidate(start, end);
- break;
- case PCI_DMA_TODEVICE: /* writeback only */
- frv_dcache_writeback(start, end);
- break;
- case PCI_DMA_BIDIRECTIONAL: /* writeback and invalidate */
- frv_dcache_writeback(start, end);
- break;
- }
-}
-
-/*
- * consistent_sync_page make a page are consistent. identical
- * to consistent_sync, but takes a struct page instead of a virtual address
- */
-
-void consistent_sync_page(struct page *page, unsigned long offset,
- size_t size, int direction)
-{
- void *start;
-
- start = page_address(page) + offset;
- consistent_sync(start, size, direction);
-}