patch-2.4.22 linux-2.4.22/include/asm-sh64/pci.h

• Lines: 275
• Date: 2003-08-25 04:44:44.000000000 -0700
• Orig file: linux-2.4.21/include/asm-sh64/pci.h
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.21/include/asm-sh64/pci.h linux-2.4.22/include/asm-sh64/pci.h
@@ -0,0 +1,274 @@
+
+/*
+**
+**                      P C I  -  C O M M O N  Internal Interface
+**
+** Module:    This module includes all functions that can be used for all included
+**            bridge.
+**
+** Copyright: 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.
+**
+**            Copyright (C) 2001   Roberto Giai Meniet (giai@while1.com)  
+**                                 Franco  Ometti      (ometti@while1.com) 
+**
+** File:      include/asm-sh64/pci.h
+**
+** Note:      For a good view of this file use TABSTOP=8
+**
+*/
+
+
+/*
+** System includes
+*/
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <asm/scatterlist.h>
+#include <linux/string.h>
+#include <asm/io.h>
+
+struct pci_dev;
+
+#ifndef __ASM_SH64_PCI_H
+#define __ASM_SH64_PCI_H
+
+#ifdef __KERNEL__
+
+/* 
+** 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()     1
+
+/* 
+** These are currently the correct values for the STM overdrive board.
+** We need some way of setting this on a board specific way, it will
+** not be the same on other boards I think
+*/
+#if defined(CONFIG_CPU_SUBTYPE_SH5_101) || defined(CONFIG_CPU_SUBTYPE_SH5_103)
+#define PCIBIOS_MIN_IO          0x2000
+#define PCIBIOS_MIN_MEM         0x40000000
+#endif
+
+
+/*
+** Set penalize isa irq function
+*/
+static inline void pcibios_penalize_isa_irq(int irq)
+{
+	/* We don't do dynamic PCI IRQ allocation */
+}
+
+
+/* 
+** Dynamic DMA mapping stuff.
+** SuperH has everything mapped statically like x86.
+*/
+
+/* 
+** 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.
+*/
+static inline dma_addr_t pci_map_single(struct pci_dev *hwdev, void *ptr,
+					size_t size,int direction)
+{
+	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.
+**
+** After this call, reads by the cpu to the buffer are guarenteed to see
+** whatever the device wrote there.
+*/
+static inline void pci_unmap_single(struct pci_dev *hwdev, dma_addr_t dma_addr,
+				    size_t size,int direction)
+{
+	/* 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)
+{
+	return ((dma_addr_t)(page - mem_map) *
+		(dma_addr_t) PAGE_SIZE +
+		(dma_addr_t) offset);
+}
+
+static inline void pci_unmap_page(struct pci_dev *hwdev, dma_addr_t dma_address,
+				  size_t size, int direction)
+{
+	/* 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.
+*/
+static inline int pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sg,
+			     int nents,int direction)
+{
+	int i;
+
+	for (i = 0; i < nents; i++) {
+		if (sg[i].address) {
+			dma_cache_wback_inv((unsigned long)sg[i].address,
+					    sg[i].length);
+			sg[i].dma_address = virt_to_bus(sg[i].address);
+		} else {
+			sg[i].dma_address = page_to_bus(sg[i].page) +
+					    sg[i].offset;
+			dma_cache_wback_inv((unsigned long) bus_to_virt(sg[i].dma_address), sg[i].length);
+		}
+	}
+
+	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.
+*/
+static inline void pci_unmap_sg(struct pci_dev *hwdev, struct scatterlist *sg,
+				int nents,int direction)
+{
+	int i;
+
+	if (direction == PCI_DMA_TODEVICE)
+		return;
+	
+	for (i = 0; i < nents; i++) {
+		if (!sg[i].address)
+			continue;
+
+		dma_cache_wback_inv((unsigned long)sg[i].address, sg[i].length);
+	}
+}
+
+
+/* 
+** 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.
+*/
+static 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.
+*/
+static inline void pci_dma_sync_sg(struct pci_dev *hwdev,
+				   struct scatterlist *sg,
+				   int nelems,int direction)
+{
+	int i;
+
+	for (i = 0; i < nelems; i++)
+		dma_cache_wback_inv((unsigned long)sg[i].address, sg[i].length);
+}
+
+
+/* 
+** Return whether the given PCI device DMA address mask can
+** be supported properly.  For example, if your device can
+** only drive the low 24-bits during PCI bus mastering, then
+** you would pass 0x00ffffff as the mask to this function.
+*/
+extern inline int pci_dma_supported(struct pci_dev *hwdev, dma_addr_t mask)
+{
+	return 1;
+}
+
+
+/* Not supporting more than 32-bit PCI bus addresses now, but
+ * must satisfy references to this function.  Change if needed.
+ */
+#define pci_dac_dma_supported(pci_dev, mask) (0)
+ 
+/* Return the index of the PCI controller for device PDEV. */
+#define pci_controller_num(PDEV)        (0)
+
+/* 
+** 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)      ((sg)->dma_address)
+#define sg_dma_len(sg)          ((sg)->length)
+
+#define PCI_DMA_BUS_IS_PHYS	(1)
+
+#endif /* __KERNEL__ */
+
+#endif /* __ASM_SH64_PCI_H */
+