patch-2.4.6 linux/arch/sh/kernel/pci-dma.c

• Lines: 43
• Date: Wed Jun 27 13:55:29 2001
• Orig file: v2.4.5/linux/arch/sh/kernel/pci-dma.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.5/linux/arch/sh/kernel/pci-dma.c linux/arch/sh/kernel/pci-dma.c
@@ -0,0 +1,42 @@
+/* 
+ * Copyright (C) 2001 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.
+ */
+
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/pci.h>
+#include <asm/io.h>
+#include <asm/addrspace.h>
+
+
+void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size,
+			   dma_addr_t * dma_handle)
+{
+	void *ret;
+	int gfp = GFP_ATOMIC;
+
+	ret = (void *) __get_free_pages(gfp, get_order(size));
+
+	if (ret != NULL) {
+	        /* Is it neccessary to do the memset? */
+		memset(ret, 0, size);
+		*dma_handle = virt_to_bus(ret);
+	}
+	/* We must flush the cache before we pass it on to the device */
+	flush_cache_all();
+	return  P2SEGADDR(ret);
+}
+
+void pci_free_consistent(struct pci_dev *hwdev, size_t size,
+			 void *vaddr, dma_addr_t dma_handle)
+{
+        unsigned long p1addr=P1SEGADDR((unsigned long)vaddr);
+
+	free_pages(p1addr, get_order(size));
+}