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-rw-r--r--arch/c6x/mm/dma-coherent.c143
1 files changed, 143 insertions, 0 deletions
diff --git a/arch/c6x/mm/dma-coherent.c b/arch/c6x/mm/dma-coherent.c
new file mode 100644
index 00000000000..4187e518037
--- /dev/null
+++ b/arch/c6x/mm/dma-coherent.c
@@ -0,0 +1,143 @@
+/*
+ * Port on Texas Instruments TMS320C6x architecture
+ *
+ * Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
+ * Author: Aurelien Jacquiot <aurelien.jacquiot@ti.com>
+ *
+ * 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.
+ *
+ * DMA uncached mapping support.
+ *
+ * Using code pulled from ARM
+ * Copyright (C) 2000-2004 Russell King
+ *
+ */
+#include <linux/slab.h>
+#include <linux/bitmap.h>
+#include <linux/bitops.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/dma-mapping.h>
+#include <linux/memblock.h>
+
+#include <asm/page.h>
+
+/*
+ * DMA coherent memory management, can be redefined using the memdma=
+ * kernel command line
+ */
+
+/* none by default */
+static phys_addr_t dma_base;
+static u32 dma_size;
+static u32 dma_pages;
+
+static unsigned long *dma_bitmap;
+
+/* bitmap lock */
+static DEFINE_SPINLOCK(dma_lock);
+
+/*
+ * Return a DMA coherent and contiguous memory chunk from the DMA memory
+ */
+static inline u32 __alloc_dma_pages(int order)
+{
+ unsigned long flags;
+ u32 pos;
+
+ spin_lock_irqsave(&dma_lock, flags);
+ pos = bitmap_find_free_region(dma_bitmap, dma_pages, order);
+ spin_unlock_irqrestore(&dma_lock, flags);
+
+ return dma_base + (pos << PAGE_SHIFT);
+}
+
+static void __free_dma_pages(u32 addr, int order)
+{
+ unsigned long flags;
+ u32 pos = (addr - dma_base) >> PAGE_SHIFT;
+
+ if (addr < dma_base || (pos + (1 << order)) >= dma_pages) {
+ printk(KERN_ERR "%s: freeing outside range.\n", __func__);
+ BUG();
+ }
+
+ spin_lock_irqsave(&dma_lock, flags);
+ bitmap_release_region(dma_bitmap, pos, order);
+ spin_unlock_irqrestore(&dma_lock, flags);
+}
+
+/*
+ * Allocate DMA coherent memory space and return both the kernel
+ * virtual and DMA address for that space.
+ */
+void *dma_alloc_coherent(struct device *dev, size_t size,
+ dma_addr_t *handle, gfp_t gfp)
+{
+ u32 paddr;
+ int order;
+
+ if (!dma_size || !size)
+ return NULL;
+
+ order = get_count_order(((size - 1) >> PAGE_SHIFT) + 1);
+
+ paddr = __alloc_dma_pages(order);
+
+ if (handle)
+ *handle = paddr;
+
+ if (!paddr)
+ return NULL;
+
+ return phys_to_virt(paddr);
+}
+EXPORT_SYMBOL(dma_alloc_coherent);
+
+/*
+ * Free DMA coherent memory as defined by the above mapping.
+ */
+void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
+ dma_addr_t dma_handle)
+{
+ int order;
+
+ if (!dma_size || !size)
+ return;
+
+ order = get_count_order(((size - 1) >> PAGE_SHIFT) + 1);
+
+ __free_dma_pages(virt_to_phys(vaddr), order);
+}
+EXPORT_SYMBOL(dma_free_coherent);
+
+/*
+ * Initialise the coherent DMA memory allocator using the given uncached region.
+ */
+void __init coherent_mem_init(phys_addr_t start, u32 size)
+{
+ phys_addr_t bitmap_phys;
+
+ if (!size)
+ return;
+
+ printk(KERN_INFO
+ "Coherent memory (DMA) region start=0x%x size=0x%x\n",
+ start, size);
+
+ dma_base = start;
+ dma_size = size;
+
+ /* allocate bitmap */
+ dma_pages = dma_size >> PAGE_SHIFT;
+ if (dma_size & (PAGE_SIZE - 1))
+ ++dma_pages;
+
+ bitmap_phys = memblock_alloc(BITS_TO_LONGS(dma_pages) * sizeof(long),
+ sizeof(long));
+
+ dma_bitmap = phys_to_virt(bitmap_phys);
+ memset(dma_bitmap, 0, dma_pages * PAGE_SIZE);
+}