patch-2.4.13 linux/include/asm-i386/pci.h

• Lines: 123
• Date: Tue Oct 23 22:00:02 2001
• Orig file: v2.4.12/linux/include/asm-i386/pci.h
• Orig date: Thu Oct 18 13:48:29 2001

diff -u --recursive --new-file v2.4.12/linux/include/asm-i386/pci.h linux/include/asm-i386/pci.h
@@ -34,6 +34,12 @@
 
 struct pci_dev;
 
+/* The PCI address space does equal the physical memory
+ * address space.  The networking and block device layers use
+ * this boolean for bounce buffer decisions.
+ */
+#define PCI_DMA_BUS_IS_PHYS	(1)
+
 /* Allocate and map kernel buffer using consistent mode DMA for a device.
  * hwdev should be valid struct pci_dev pointer for PCI devices,
  * NULL for PCI-like buses (ISA, EISA).
@@ -84,6 +90,27 @@
 	/* Nothing to do */
 }
 
+/*
+ * pci_{map,unmap}_single_page maps a kernel page to a dma_addr_t. identical
+ * to pci_map_single, but takes a struct page instead of a virtual address
+ */
+static inline dma_addr_t pci_map_page(struct pci_dev *hwdev, struct page *page,
+				      unsigned long offset, size_t size, int direction)
+{
+	if (direction == PCI_DMA_NONE)
+		BUG();
+
+	return (page - mem_map) * PAGE_SIZE + offset;
+}
+
+static inline void pci_unmap_page(struct pci_dev *hwdev, dma_addr_t dma_address,
+				  size_t size, int direction)
+{
+	if (direction == PCI_DMA_NONE)
+		BUG();
+	/* Nothing to do */
+}
+
 /* Map a set of buffers described by scatterlist in streaming
  * mode for DMA.  This is the scather-gather version of the
  * above pci_map_single interface.  Here the scatter gather list
@@ -102,8 +129,26 @@
 static inline int pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sg,
 			     int nents, int direction)
 {
+	int i;
+
 	if (direction == PCI_DMA_NONE)
 		BUG();
+
+	/*
+	 * temporary 2.4 hack
+	 */
+	for (i = 0; i < nents; i++ ) {
+		if (sg[i].address && sg[i].page)
+			BUG();
+		else if (!sg[i].address && !sg[i].page)
+			BUG();
+
+		if (sg[i].address)
+			sg[i].dma_address = virt_to_bus(sg[i].address);
+		else
+			sg[i].dma_address = page_to_bus(sg[i].page) + sg[i].offset;
+	}
+
 	return nents;
 }
 
@@ -157,7 +202,7 @@
  * only drive the low 24-bits during PCI bus mastering, then
  * you would pass 0x00ffffff as the mask to this function.
  */
-static inline int pci_dma_supported(struct pci_dev *hwdev, dma_addr_t mask)
+static inline int pci_dma_supported(struct pci_dev *hwdev, u64 mask)
 {
         /*
          * we fall back to GFP_DMA when the mask isn't all 1s,
@@ -170,13 +215,42 @@
 	return 1;
 }
 
+/* This is always fine. */
+#define pci_dac_dma_supported(pci_dev, mask)	(1)
+
+static __inline__ dma64_addr_t
+pci_dac_page_to_dma(struct pci_dev *pdev, struct page *page, unsigned long offset, int direction)
+{
+	return ((dma64_addr_t) page_to_bus(page) +
+		(dma64_addr_t) offset);
+}
+
+static __inline__ struct page *
+pci_dac_dma_to_page(struct pci_dev *pdev, dma64_addr_t dma_addr)
+{
+	unsigned long poff = (dma_addr >> PAGE_SHIFT);
+
+	return mem_map + poff;
+}
+
+static __inline__ unsigned long
+pci_dac_dma_to_offset(struct pci_dev *pdev, dma64_addr_t dma_addr)
+{
+	return (dma_addr & ~PAGE_MASK);
+}
+
+static __inline__ void
+pci_dac_dma_sync_single(struct pci_dev *pdev, dma64_addr_t dma_addr, size_t len, int direction)
+{
+	/* Nothing to do. */
+}
+
 /* These macros should be used after a pci_map_sg call has been done
  * to get bus addresses of each of the SG entries and their lengths.
  * You should only work with the number of sg entries pci_map_sg
- * returns, or alternatively stop on the first sg_dma_len(sg) which
- * is 0.
+ * returns.
  */
-#define sg_dma_address(sg)	(virt_to_bus((sg)->address))
+#define sg_dma_address(sg)	((sg)->dma_address)
 #define sg_dma_len(sg)		((sg)->length)
 
 /* Return the index of the PCI controller for device. */