This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / xtensa / kernel / pci-dma.c

diff --git a/arch/xtensa/kernel/pci-dma.c b/arch/xtensa/kernel/pci-dma.c
new file mode 100644 (file)
index 0000000..1ff8226
--- /dev/null
+++ b/arch/xtensa/kernel/pci-dma.c
@@ -0,0 +1,73 @@
+/*
+ * arch/xtensa/pci-dma.c
+ *
+ * DMA coherent memory allocation.
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ *
+ * Copyright (C) 2002 - 2005 Tensilica Inc.
+ *
+ * Based on version for i386.
+ *
+ * Chris Zankel <chris@zankel.net>
+ * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
+ */
+
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/pci.h>
+#include <asm/io.h>
+#include <asm/cacheflush.h>
+
+/*
+ * Note: We assume that the full memory space is always mapped to 'kseg'
+ *      Otherwise we have to use page attributes (not implemented).
+ */
+
+void *
+dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp)
+{
+       void *ret;
+
+       /* ignore region speicifiers */
+       gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
+
+       if (dev == NULL || (*dev->dma_mask < 0xffffffff))
+               gfp |= GFP_DMA;
+       ret = (void *)__get_free_pages(gfp, get_order(size));
+
+       if (ret != NULL) {
+               memset(ret, 0, size);
+               *handle = virt_to_bus(ret);
+       }
+       return (void*) BYPASS_ADDR((unsigned long)ret);
+}
+
+void dma_free_coherent(struct device *hwdev, size_t size,
+                        void *vaddr, dma_addr_t dma_handle)
+{
+       free_pages(CACHED_ADDR((unsigned long)vaddr), get_order(size));
+}
+
+
+void consistent_sync(void *vaddr, size_t size, int direction)
+{
+       switch (direction) {
+       case PCI_DMA_NONE:
+               BUG();
+       case PCI_DMA_FROMDEVICE:        /* invalidate only */
+               __invalidate_dcache_range((unsigned long)vaddr,
+                                         (unsigned long)size);
+               break;
+
+       case PCI_DMA_TODEVICE:          /* writeback only */
+       case PCI_DMA_BIDIRECTIONAL:     /* writeback and invalidate */
+               __flush_invalidate_dcache_range((unsigned long)vaddr,
+                                               (unsigned long)size);
+               break;
+       }
+}