patch-2.3.43 linux/include/asm-ia64/pci.h

• Lines: 149
• Date: Sun Feb 6 18:42:40 2000
• Orig file: v2.3.42/linux/include/asm-ia64/pci.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.42/linux/include/asm-ia64/pci.h linux/include/asm-ia64/pci.h
@@ -0,0 +1,148 @@
+#ifndef _ASM_IA64_PCI_H
+#define _ASM_IA64_PCI_H
+
+/*
+ * Can be used to override the logic in pci_scan_bus for skipping
+ * already-configured bus numbers - to be used for buggy BIOSes or
+ * architectures with incomplete PCI setup by the loader.
+ */
+#define pcibios_assign_all_busses()     0
+
+#define PCIBIOS_MIN_IO		0x1000
+#define PCIBIOS_MIN_MEM		0x10000000
+
+/*
+ * Dynamic DMA mapping API.
+ * IA-64 has everything mapped statically.
+ */
+
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/types.h>
+
+#include <asm/io.h>
+#include <asm/scatterlist.h>
+
+struct pci_dev;
+
+/*
+ * 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).
+ * Returns non-NULL cpu-view pointer to the buffer if successful and
+ * sets *dma_addrp to the pci side dma address as well, else *dma_addrp
+ * is undefined.
+ */
+extern void *pci_alloc_consistent (struct pci_dev *hwdev, size_t size, dma_addr_t *dma_handle);
+
+/*
+ * Free and unmap a consistent DMA buffer.
+ * cpu_addr is what was returned from pci_alloc_consistent,
+ * size must be the same as what as passed into pci_alloc_consistent,
+ * and likewise dma_addr must be the same as what *dma_addrp was set to.
+ *
+ * References to the memory and mappings associated with cpu_addr/dma_addr
+ * past this call are illegal.
+ */
+extern void pci_free_consistent (struct pci_dev *hwdev, size_t size,
+				 void *vaddr, dma_addr_t dma_handle);
+
+/*
+ * Map a single buffer of the indicated size for DMA in streaming mode.
+ * The 32-bit bus address to use is returned.
+ *
+ * Once the device is given the dma address, the device owns this memory
+ * until either pci_unmap_single or pci_dma_sync_single is performed.
+ */
+extern inline dma_addr_t
+pci_map_single (struct pci_dev *hwdev, void *ptr, size_t size)
+{
+	return virt_to_bus(ptr);
+}
+
+/*
+ * Unmap a single streaming mode DMA translation.  The dma_addr and size
+ * must match what was provided for in a previous pci_map_single call.  All
+ * other usages are undefined.
+ *
+ * After this call, reads by the cpu to the buffer are guarenteed to see
+ * whatever the device wrote there.
+ */
+extern inline void
+pci_unmap_single (struct pci_dev *hwdev, dma_addr_t dma_addr, size_t size)
+{
+	/* 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
+ * elements are each tagged with the appropriate dma address
+ * and length.  They are obtained via sg_dma_{address,length}(SG).
+ *
+ * NOTE: An implementation may be able to use a smaller number of
+ *       DMA address/length pairs than there are SG table elements.
+ *       (for example via virtual mapping capabilities)
+ *       The routine returns the number of addr/length pairs actually
+ *       used, at most nents.
+ *
+ * Device ownership issues as mentioned above for pci_map_single are
+ * the same here.
+ */
+extern inline int
+pci_map_sg (struct pci_dev *hwdev, struct scatterlist *sg, int nents)
+{
+	return nents;
+}
+
+/*
+ * Unmap a set of streaming mode DMA translations.
+ * Again, cpu read rules concerning calls here are the same as for
+ * pci_unmap_single() above.
+ */
+extern inline void
+pci_unmap_sg (struct pci_dev *hwdev, struct scatterlist *sg, int nents)
+{
+	/* Nothing to do */
+}
+
+/*
+ * Make physical memory consistent for a single
+ * streaming mode DMA translation after a transfer.
+ *
+ * If you perform a pci_map_single() but wish to interrogate the
+ * buffer using the cpu, yet do not wish to teardown the PCI dma
+ * mapping, you must call this function before doing so.  At the
+ * next point you give the PCI dma address back to the card, the
+ * device again owns the buffer.
+ */
+extern inline void
+pci_dma_sync_single (struct pci_dev *hwdev, dma_addr_t dma_handle, size_t size)
+{
+	/* Nothing to do */
+}
+
+/*
+ * Make physical memory consistent for a set of streaming mode DMA
+ * translations after a transfer.
+ *
+ * The same as pci_dma_sync_single but for a scatter-gather list,
+ * same rules and usage.
+ */
+extern inline void
+pci_dma_sync_sg (struct pci_dev *hwdev, struct scatterlist *sg, int nelems)
+{
+	/* 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.
+ */
+#define sg_dma_address(sg)	(virt_to_bus((sg)->address))
+#define sg_dma_len(sg)		((sg)->length)
+
+#endif /* _ASM_IA64_PCI_H */