1 files changed, 188 insertions, 0 deletions

diff --git a/arch/frv/mm/dma-alloc.c b/arch/frv/mm/dma-alloc.c
new file mode 100644
index 000000000000..4b38d45435f6
--- /dev/null
+++ b/arch/frv/mm/dma-alloc.c
@@ -0,0 +1,188 @@
+/* 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/config.h>
+#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 <asm/pgalloc.h>
+#include <asm/io.h>
+#include <asm/hardirq.h>
+#include <asm/mmu_context.h>
+#include <asm/pgtable.h>
+#include <asm/mmu.h>
+#include <asm/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;
+
+        spin_lock(&init_mm.page_table_lock);
+
+        /* 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(&init_mm, pme, va);
+        if (pte != 0) {
+                err = 0;
+                set_pte(pte, mk_pte_phys(pa & PAGE_MASK, prot));
+        }
+
+        spin_unlock(&init_mm.page_table_lock);
+        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(int 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);
+
+                for (i = 1; i < (1 << order); i++)
+                        set_page_count(rpage + i, 1);
+        }
+
+        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);
+}