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Diffstat (limited to 'arch/alpha/include/asm/pci.h')
| -rw-r--r-- | arch/alpha/include/asm/pci.h | 276 |
1 files changed, 276 insertions, 0 deletions
diff --git a/arch/alpha/include/asm/pci.h b/arch/alpha/include/asm/pci.h new file mode 100644 index 00000000000..2a14302c17a --- /dev/null +++ b/arch/alpha/include/asm/pci.h @@ -0,0 +1,276 @@ +#ifndef __ALPHA_PCI_H +#define __ALPHA_PCI_H + +#ifdef __KERNEL__ + +#include <linux/spinlock.h> +#include <linux/dma-mapping.h> +#include <asm/scatterlist.h> +#include <asm/machvec.h> + +/* + * The following structure is used to manage multiple PCI busses. + */ + +struct pci_dev; +struct pci_bus; +struct resource; +struct pci_iommu_arena; +struct page; + +/* A controller. Used to manage multiple PCI busses. */ + +struct pci_controller { + struct pci_controller *next; + struct pci_bus *bus; + struct resource *io_space; + struct resource *mem_space; + + /* The following are for reporting to userland. The invariant is + that if we report a BWX-capable dense memory, we do not report + a sparse memory at all, even if it exists. */ + unsigned long sparse_mem_base; + unsigned long dense_mem_base; + unsigned long sparse_io_base; + unsigned long dense_io_base; + + /* This one's for the kernel only. It's in KSEG somewhere. */ + unsigned long config_space_base; + + unsigned int index; + /* For compatibility with current (as of July 2003) pciutils + and XFree86. Eventually will be removed. */ + unsigned int need_domain_info; + + struct pci_iommu_arena *sg_pci; + struct pci_iommu_arena *sg_isa; + + void *sysdata; +}; + +/* Override the logic in pci_scan_bus for skipping already-configured + bus numbers. */ + +#define pcibios_assign_all_busses() 1 +#define pcibios_scan_all_fns(a, b) 0 + +#define PCIBIOS_MIN_IO alpha_mv.min_io_address +#define PCIBIOS_MIN_MEM alpha_mv.min_mem_address + +extern void pcibios_set_master(struct pci_dev *dev); + +extern inline void pcibios_penalize_isa_irq(int irq, int active) +{ + /* We don't do dynamic PCI IRQ allocation */ +} + +/* IOMMU controls. */ + +/* The PCI address space does not 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 0 + +/* Allocate and map kernel buffer using consistent mode DMA for PCI + device. 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 *, size_t, + dma_addr_t *, gfp_t); +static inline void * +pci_alloc_consistent(struct pci_dev *dev, size_t size, dma_addr_t *dma) +{ + return __pci_alloc_consistent(dev, size, dma, GFP_ATOMIC); +} + +/* Free and unmap a consistent DMA buffer. CPU_ADDR and DMA_ADDR must + be values that were returned from pci_alloc_consistent. SIZE must + be the same as what as passed into pci_alloc_consistent. + References to the memory and mappings associated with CPU_ADDR or + DMA_ADDR past this call are illegal. */ + +extern void pci_free_consistent(struct pci_dev *, size_t, void *, dma_addr_t); + +/* Map a single buffer of the indicate size for PCI DMA in streaming mode. + The 32-bit PCI bus mastering 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_for_cpu is performed. */ + +extern dma_addr_t pci_map_single(struct pci_dev *, void *, size_t, int); + +/* Likewise, but for a page instead of an address. */ +extern dma_addr_t pci_map_page(struct pci_dev *, struct page *, + unsigned long, size_t, int); + +/* Test for pci_map_single or pci_map_page having generated an error. */ + +static inline int +pci_dma_mapping_error(struct pci_dev *pdev, dma_addr_t dma_addr) +{ + return dma_addr == 0; +} + +/* 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 guaranteed to see whatever the device + wrote there. */ + +extern void pci_unmap_single(struct pci_dev *, dma_addr_t, size_t, int); +extern void pci_unmap_page(struct pci_dev *, dma_addr_t, size_t, int); + +/* pci_unmap_{single,page} is not a nop, thus... */ +#define DECLARE_PCI_UNMAP_ADDR(ADDR_NAME) \ + dma_addr_t ADDR_NAME; +#define DECLARE_PCI_UNMAP_LEN(LEN_NAME) \ + __u32 LEN_NAME; +#define pci_unmap_addr(PTR, ADDR_NAME) \ + ((PTR)->ADDR_NAME) +#define pci_unmap_addr_set(PTR, ADDR_NAME, VAL) \ + (((PTR)->ADDR_NAME) = (VAL)) +#define pci_unmap_len(PTR, LEN_NAME) \ + ((PTR)->LEN_NAME) +#define pci_unmap_len_set(PTR, LEN_NAME, VAL) \ + (((PTR)->LEN_NAME) = (VAL)) + +/* Map a set of buffers described by scatterlist in streaming mode for + PCI DMA. This is the scatter-gather version of the above + pci_map_single interface. Here the scatter gather list elements + are each tagged with the appropriate PCI 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 int pci_map_sg(struct pci_dev *, struct scatterlist *, int, int); + +/* 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 void pci_unmap_sg(struct pci_dev *, struct scatterlist *, int, int); + +/* Make physical memory consistent for a single streaming mode DMA + translation after a transfer and device currently has ownership + of the buffer. + + 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, you must first + perform a pci_dma_sync_for_device, and then the device again owns + the buffer. */ + +static inline void +pci_dma_sync_single_for_cpu(struct pci_dev *dev, dma_addr_t dma_addr, + long size, int direction) +{ + /* Nothing to do. */ +} + +static inline void +pci_dma_sync_single_for_device(struct pci_dev *dev, dma_addr_t dma_addr, + size_t size, int direction) +{ + /* 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. */ + +static inline void +pci_dma_sync_sg_for_cpu(struct pci_dev *dev, struct scatterlist *sg, + int nents, int direction) +{ + /* Nothing to do. */ +} + +static inline void +pci_dma_sync_sg_for_device(struct pci_dev *dev, struct scatterlist *sg, + int nents, int direction) +{ + /* Nothing to do. */ +} + +/* 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 int pci_dma_supported(struct pci_dev *hwdev, u64 mask); + +#ifdef CONFIG_PCI +static inline void pci_dma_burst_advice(struct pci_dev *pdev, + enum pci_dma_burst_strategy *strat, + unsigned long *strategy_parameter) +{ + unsigned long cacheline_size; + u8 byte; + + pci_read_config_byte(pdev, PCI_CACHE_LINE_SIZE, &byte); + if (byte == 0) + cacheline_size = 1024; + else + cacheline_size = (int) byte * 4; + + *strat = PCI_DMA_BURST_BOUNDARY; + *strategy_parameter = cacheline_size; +} +#endif + +/* TODO: integrate with include/asm-generic/pci.h ? */ +static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel) +{ + return channel ? 15 : 14; +} + +extern void pcibios_resource_to_bus(struct pci_dev *, struct pci_bus_region *, + struct resource *); + +extern void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res, + struct pci_bus_region *region); + +static inline struct resource * +pcibios_select_root(struct pci_dev *pdev, struct resource *res) +{ + struct resource *root = NULL; + + if (res->flags & IORESOURCE_IO) + root = &ioport_resource; + if (res->flags & IORESOURCE_MEM) + root = &iomem_resource; + + return root; +} + +#define pci_domain_nr(bus) ((struct pci_controller *)(bus)->sysdata)->index + +static inline int pci_proc_domain(struct pci_bus *bus) +{ + struct pci_controller *hose = bus->sysdata; + return hose->need_domain_info; +} + +struct pci_dev *alpha_gendev_to_pci(struct device *dev); + +#endif /* __KERNEL__ */ + +/* Values for the `which' argument to sys_pciconfig_iobase. */ +#define IOBASE_HOSE 0 +#define IOBASE_SPARSE_MEM 1 +#define IOBASE_DENSE_MEM 2 +#define IOBASE_SPARSE_IO 3 +#define IOBASE_DENSE_IO 4 +#define IOBASE_ROOT_BUS 5 +#define IOBASE_FROM_HOSE 0x10000 + +extern struct pci_dev *isa_bridge; + +#endif /* __ALPHA_PCI_H */ |