patch-2.4.22 linux-2.4.22/arch/sh64/kernel/pci-dma.c

• Lines: 51
• Date: 2003-08-25 04:44:40.000000000 -0700
• Orig file: linux-2.4.21/arch/sh64/kernel/pci-dma.c
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.21/arch/sh64/kernel/pci-dma.c linux-2.4.22/arch/sh64/kernel/pci-dma.c
@@ -0,0 +1,50 @@
+/* 
+ * Copyright (C) 2001 David J. Mckay (david.mckay@st.com)
+ * Copyright (C) 2003 Paul Mundt (lethal@linux-sh.org)
+ *
+ * May be copied or modified under the terms of the GNU General Public
+ * License.  See linux/COPYING for more information.                            
+ *
+ * Dynamic DMA mapping support.
+ */
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/pci.h>
+#include <asm/io.h>
+
+void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size,
+			   dma_addr_t *dma_handle)
+{
+	void *ret;
+	int gfp = GFP_ATOMIC;
+        void *vp;
+
+	if (hwdev == NULL || hwdev->dma_mask != 0xffffffff)
+		gfp |= GFP_DMA;
+
+	ret = (void *)__get_free_pages(gfp, get_order(size));
+
+	/* now call our friend ioremap_nocache to give us an uncached area */
+        vp = ioremap_nocache(virt_to_phys(ret), size);
+
+	if (vp != NULL) {
+		memset(vp, 0, size);
+		*dma_handle = virt_to_bus(ret);
+		dma_cache_wback_inv((unsigned long)ret, size);
+	}
+
+	return vp;
+}
+
+void pci_free_consistent(struct pci_dev *hwdev, size_t size,
+			 void *vaddr, dma_addr_t dma_handle)
+{
+	void *alloc;
+
+	alloc = bus_to_virt((unsigned long)dma_handle);
+	free_pages((unsigned long)alloc, get_order(size));
+
+	iounmap(vaddr);
+}
+