patch-2.3.48 linux/include/asm-mips/pci.h

• Lines: 233
• Date: Thu Feb 24 22:52:30 2000
• Orig file: v2.3.47/linux/include/asm-mips/pci.h
• Orig date: Fri Jun 25 17:37:53 1999

diff -u --recursive --new-file v2.3.47/linux/include/asm-mips/pci.h linux/include/asm-mips/pci.h
@@ -1,42 +1,199 @@
-/* $Id: pci.h,v 1.4 1998/05/08 01:44:30 ralf Exp $
+/* $Id: pci.h,v 1.9 2000/02/24 00:13:19 ralf Exp $
  *
  * This file is subject to the terms and conditions of the GNU General Public
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.
+ */
+#ifndef _ASM_PCI_H
+#define _ASM_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
+
+#ifdef __KERNEL__
+
+/*
+ * Dynamic DMA mapping stuff.
+ * MIPS has everything mapped statically.
+ */
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <asm/scatterlist.h>
+#include <linux/string.h>
+#include <asm/io.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, int direction)
+{
+	if (direction == PCI_DMA_NONE)
+		BUG();
+
+	dma_cache_wback_inv((unsigned long)ptr, 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.
  *
- * Declarations for the MIPS specific implementation of the PCI BIOS32 services.
+ * After this call, reads by the cpu to the buffer are guarenteed to see
+ * whatever the device wrote there.
  */
-#ifndef __ASM_MIPS_PCI_H
-#define __ASM_MIPS_PCI_H
+extern inline void pci_unmap_single(struct pci_dev *hwdev, dma_addr_t dma_addr,
+				    size_t size, int direction)
+{
+	if (direction == PCI_DMA_NONE)
+		BUG();
+
+	/* Nothing to do */
+}
 
-struct pci_ops {
-	void (*pcibios_fixup) (void);
-	int (*pcibios_read_config_byte) (unsigned char bus,
-	                                 unsigned char dev_fn,
-	                                 unsigned char where,
-	                                 unsigned char *val);
-	int (*pcibios_read_config_word) (unsigned char bus,
-	                                 unsigned char dev_fn,
-	                                 unsigned char where,
-	                                 unsigned short *val);
-	int (*pcibios_read_config_dword) (unsigned char bus,
-	                                  unsigned char dev_fn,
-	                                  unsigned char where,
-	                                  unsigned int *val);
-	int (*pcibios_write_config_byte) (unsigned char bus,
-	                                  unsigned char dev_fn,
-	                                  unsigned char where,
-	                                  unsigned char val);
-	int (*pcibios_write_config_word) (unsigned char bus,
-	                                  unsigned char dev_fn,
-	                                  unsigned char where,
-	                                  unsigned short val);
-	int (*pcibios_write_config_dword) (unsigned char bus,
-	                                   unsigned char dev_fn,
-	                                   unsigned char where,
-	                                   unsigned int val);
-};
+/*
+ * 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, int direction)
+{
+#ifndef CONFIG_COHERENT_IO
+	int i;
+#endif
+
+	if (direction == PCI_DMA_NONE)
+		BUG();
+
+#ifndef CONFIG_COHERENT_IO
+	/* Make sure that gcc doesn't leave the empty loop body.  */
+	for (i = 0; i < nents; i++, sg++)
+		dma_cache_wback_inv((unsigned long)sg->address, sg->length);
+#endif
+
+	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, int direction)
+{
+	if (direction == PCI_DMA_NONE)
+		BUG();
+
+	/* 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, int direction)
+{
+	if (direction == PCI_DMA_NONE)
+		BUG();
+
+	dma_cache_wback_inv((unsigned long)bus_to_virt(dma_handle), size);
+}
+
+/*
+ * 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, int direction)
+{
+#ifndef CONFIG_COHERENT_IO
+	int i;
+#endif
+
+	if (direction == PCI_DMA_NONE)
+		BUG();
+
+	/* Make sure that gcc doesn't leave the empty loop body.  */
+#ifndef CONFIG_COHERENT_IO
+	for (i = 0; i < nelems; i++, sg++)
+		dma_cache_wback_inv((unsigned long)sg->address, sg->length);
+#endif
+}
+
+/*
+ * 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)
 
-extern struct pci_ops *pci_ops;
+#endif /* __KERNEL__ */
 
-#endif /* __ASM_MIPS_PCI_H */
+#endif /* _ASM_PCI_H */