diff options
Diffstat (limited to 'include/asm-sh/pci.h')
-rw-r--r-- | include/asm-sh/pci.h | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/include/asm-sh/pci.h b/include/asm-sh/pci.h new file mode 100644 index 000000000..e8f6e1d66 --- /dev/null +++ b/include/asm-sh/pci.h @@ -0,0 +1,143 @@ +#ifndef __ASM_SH_PCI_H +#define __ASM_SH_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 + +#ifdef __KERNEL__ + +/* Dynamic DMA mapping stuff. + * SuperH has everything mapped statically like x86. + */ + +#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) +{ + 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 /* __KERNEL__ */ + + +#endif /* __ASM_SH_PCI_H */ + |