patch-2.4.22 linux-2.4.22/arch/sh/overdrive/pcidma.c

• Lines: 47
• Date: 2003-08-25 04:44:40.000000000 -0700
• Orig file: linux-2.4.21/arch/sh/overdrive/pcidma.c
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.21/arch/sh/overdrive/pcidma.c linux-2.4.22/arch/sh/overdrive/pcidma.c
@@ -0,0 +1,46 @@
+/* 
+ * Copyright (C) 2000 David J. Mckay (david.mckay@st.com)
+ *
+ * May be copied or modified under the terms of the GNU General Public
+ * License.  See linux/COPYING for more information.                            
+ *
+ * Dynamic DMA mapping support.
+ *
+ * On the overdrive, we can only DMA from memory behind the PCI bus!
+ * this means that all DMA'able memory must come from there. 
+ * this restriction will not apply to later boards.
+ */
+
+#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;
+
+        printk("BUG: pci_alloc_consistent() called - not yet supported\n");
+	/* We ALWAYS need DMA memory on the overdrive hardware,
+	 * due to it's extreme wierdness
+	 * Need to flush the cache here as well, since the memory
+	 * can still be seen through the cache!
+	 */
+	gfp |= GFP_DMA;
+	ret = (void *) __get_free_pages(gfp, get_order(size));
+
+	if (ret != NULL) {
+		memset(ret, 0, size);
+		*dma_handle = virt_to_bus(ret);
+	}
+	return ret;
+}
+
+void pci_free_consistent(struct pci_dev *hwdev, size_t size,
+			 void *vaddr, dma_addr_t dma_handle)
+{
+	free_pages((unsigned long) vaddr, get_order(size));
+}