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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [include/] [asm-ppc/] [pci.h] - Rev 1276
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#ifndef __PPC_PCI_H #define __PPC_PCI_H #ifdef __KERNEL__ #include <linux/types.h> #include <linux/slab.h> #include <linux/string.h> #include <asm/scatterlist.h> #include <asm/io.h> struct pci_dev; /* Values for the `which' argument to sys_pciconfig_iobase syscall. */ #define IOBASE_BRIDGE_NUMBER 0 #define IOBASE_MEMORY 1 #define IOBASE_IO 2 #define IOBASE_ISA_IO 3 #define IOBASE_ISA_MEM 4 /* * Set this to 1 if you want the kernel to re-assign all PCI * bus numbers */ extern int pci_assign_all_busses; #define pcibios_assign_all_busses() (pci_assign_all_busses) #define pcibios_scan_all_fns() 0 #define PCIBIOS_MIN_IO 0x1000 #define PCIBIOS_MIN_MEM 0x10000000 extern inline void pcibios_set_master(struct pci_dev *dev) { /* No special bus mastering setup handling */ } extern inline void pcibios_penalize_isa_irq(int irq) { /* We don't do dynamic PCI IRQ allocation */ } extern unsigned long pci_resource_to_bus(struct pci_dev *pdev, struct resource *res); /* * The PCI bus bridge can translate addresses issued by the processor(s) * into a different address on the PCI bus. On 32-bit cpus, we assume * this mapping is 1-1, but on 64-bit systems it often isn't. * * Obsolete ! Drivers should now use pci_resource_to_bus */ extern unsigned long phys_to_bus(unsigned long pa); extern unsigned long pci_phys_to_bus(unsigned long pa, int busnr); extern unsigned long pci_bus_to_phys(unsigned int ba, int busnr); /* * Dynamic DMA Mapping stuff * Originally stolen from i386 by ajoshi and updated by paulus * Non-consistent cache support by Dan Malek */ /* 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). * 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) { BUG_ON(direction == PCI_DMA_NONE); consistent_sync(ptr, size, direction); return virt_to_bus(ptr); } static 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 */ } /* pci_unmap_{page,single} is a nop so... */ #define DECLARE_PCI_UNMAP_ADDR(ADDR_NAME) #define DECLARE_PCI_UNMAP_LEN(LEN_NAME) #define pci_unmap_addr(PTR, ADDR_NAME) (0) #define pci_unmap_addr_set(PTR, ADDR_NAME, VAL) do { } while (0) #define pci_unmap_len(PTR, LEN_NAME) (0) #define pci_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0) /* * 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) { BUG_ON(direction == PCI_DMA_NONE); consistent_sync_page(page, offset, size, direction); return (page - mem_map) * PAGE_SIZE + PCI_DRAM_OFFSET + 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 * elements are each tagged with the appropriate dma address * and length. They are obtained via sg_dma_{address,len}(SG), * defined in <asm/scatterlist.h>. * * 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; 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) { consistent_sync(sg[i].address, sg[i].length, direction); sg[i].dma_address = virt_to_bus(sg[i].address); } else { consistent_sync_page(sg[i].page, sg[i].offset, sg[i].length, direction); sg[i].dma_address = page_to_bus(sg[i].page) + sg[i].offset; } sg[i].dma_length = 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) { BUG_ON(direction == PCI_DMA_NONE); /* 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. */ static inline void pci_dma_sync_single(struct pci_dev *hwdev, dma_addr_t dma_handle, size_t size, int direction) { BUG_ON(direction == PCI_DMA_NONE); consistent_sync(bus_to_virt(dma_handle), size, direction); } /* 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; BUG_ON(direction == PCI_DMA_NONE); for (i = 0; i < nelems; i++, sg++) { if (sg->address) consistent_sync(sg->address, sg->length, direction); else consistent_sync_page(sg->page, sg->offset, sg->length, direction); } } /* 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. */ static inline int pci_dma_supported(struct pci_dev *hwdev, u64 mask) { return 1; } /* * At present there are very few 32-bit PPC machines that can have * memory above the 4GB point, and we don't support that. */ #define pci_dac_dma_supported(pci_dev, mask) (0) 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) + offset; } static __inline__ struct page * pci_dac_dma_to_page(struct pci_dev *pdev, dma64_addr_t dma_addr) { return mem_map + (unsigned long)(dma_addr >> PAGE_SHIFT); } 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. */ } /* Return the index of the PCI controller for device PDEV. */ extern int pci_controller_num(struct pci_dev *pdev); /* Map a range of PCI memory or I/O space for a device into user space */ int pci_mmap_page_range(struct pci_dev *pdev, struct vm_area_struct *vma, enum pci_mmap_state mmap_state, int write_combine); /* Tell drivers/pci/proc.c that we have pci_mmap_page_range() */ #define HAVE_PCI_MMAP 1 #endif /* __KERNEL__ */ #endif /* __PPC_PCI_H */
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