| /* |
| * 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 |
| |
| #include <linux/config.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 */ |
| |
| #ifdef CONFIG_PCI |
| extern unsigned int pcibios_assign_all_busses(void); |
| #else |
| #define pcibios_assign_all_busses() 0 |
| #endif |
| #define pcibios_scan_all_fns() 0 |
| |
| #define PCIBIOS_MIN_IO 0x1000 |
| #define PCIBIOS_MIN_MEM 0x10000000 |
| |
| extern void pcibios_set_master(struct pci_dev *dev); |
| |
| static inline void pcibios_penalize_isa_irq(int irq) |
| { |
| /* We don't do dynamic PCI IRQ allocation */ |
| } |
| |
| /* |
| * Dynamic DMA mapping stuff. |
| * MIPS has everything mapped statically. |
| */ |
| |
| #include <linux/types.h> |
| #include <linux/slab.h> |
| #include <asm/scatterlist.h> |
| #include <linux/string.h> |
| #include <asm/io.h> |
| |
| #if (defined(CONFIG_DDB5074) || defined(CONFIG_DDB5476)) |
| #undef PCIBIOS_MIN_IO |
| #undef PCIBIOS_MIN_MEM |
| #define PCIBIOS_MIN_IO 0x0100000 |
| #define PCIBIOS_MIN_MEM 0x1000000 |
| #endif |
| |
| struct pci_dev; |
| |
| /* |
| * 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) |
| { |
| unsigned long addr = (unsigned long) ptr; |
| |
| if (direction == PCI_DMA_NONE) |
| out_of_line_bug(); |
| |
| dma_cache_wback_inv(addr, size); |
| |
| return bus_to_baddr(hwdev->bus, __pa(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) |
| { |
| if (direction == PCI_DMA_NONE) |
| out_of_line_bug(); |
| |
| if (direction != PCI_DMA_TODEVICE) { |
| unsigned long addr; |
| |
| addr = baddr_to_bus(hwdev->bus, dma_addr) + PAGE_OFFSET; |
| dma_cache_wback_inv(addr, size); |
| } |
| } |
| |
| /* |
| * 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) |
| { |
| unsigned long addr; |
| |
| if (direction == PCI_DMA_NONE) |
| out_of_line_bug(); |
| |
| addr = (unsigned long) page_address(page) + offset; |
| dma_cache_wback_inv(addr, size); |
| |
| return bus_to_baddr(hwdev->bus, page_to_phys(page) + 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) |
| out_of_line_bug(); |
| |
| if (direction != PCI_DMA_TODEVICE) { |
| unsigned long addr; |
| |
| addr = baddr_to_bus(hwdev->bus, dma_address) + PAGE_OFFSET; |
| dma_cache_wback_inv(addr, size); |
| } |
| } |
| |
| /* 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) |
| |
| /* |
| * 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; |
| |
| if (direction == PCI_DMA_NONE) |
| out_of_line_bug(); |
| |
| for (i = 0; i < nents; i++, sg++) { |
| if (sg->address && sg->page) |
| out_of_line_bug(); |
| else if (!sg->address && !sg->page) |
| out_of_line_bug(); |
| |
| if (sg->address) { |
| dma_cache_wback_inv((unsigned long)sg->address, |
| sg->length); |
| sg->dma_address = bus_to_baddr(hwdev->bus, __pa(sg->address)); |
| } else { |
| sg->dma_address = page_to_bus(sg->page) + |
| sg->offset; |
| dma_cache_wback_inv((unsigned long) |
| (page_address(sg->page) + sg->offset), |
| sg->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_NONE) |
| out_of_line_bug(); |
| |
| if (direction == PCI_DMA_TODEVICE) |
| return; |
| |
| for (i = 0; i < nents; i++, sg++) { |
| if (sg->address && sg->page) |
| out_of_line_bug(); |
| else if (!sg->address && !sg->page) |
| out_of_line_bug(); |
| |
| if (!sg->address) |
| continue; |
| dma_cache_wback_inv((unsigned long)sg->address, sg->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) |
| { |
| unsigned long addr; |
| |
| if (direction == PCI_DMA_NONE) |
| out_of_line_bug(); |
| |
| addr = baddr_to_bus(hwdev->bus, dma_handle) + PAGE_OFFSET; |
| dma_cache_wback_inv(addr, 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) |
| { |
| #ifdef CONFIG_NONCOHERENT_IO |
| int i; |
| #endif |
| |
| if (direction == PCI_DMA_NONE) |
| out_of_line_bug(); |
| |
| /* Make sure that gcc doesn't leave the empty loop body. */ |
| #ifdef CONFIG_NONCOHERENT_IO |
| for (i = 0; i < nelems; i++, sg++) |
| dma_cache_wback_inv((unsigned long)sg->address, sg->length); |
| #endif |
| } |
| |
| /* |
| * 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) |
| { |
| /* |
| * we fall back to GFP_DMA when the mask isn't all 1s, |
| * so we can't guarantee allocations that must be |
| * within a tighter range than GFP_DMA.. |
| */ |
| #ifdef CONFIG_ISA |
| if (mask < 0x00ffffff) |
| return 0; |
| #endif |
| |
| return 1; |
| } |
| |
| /* This is always fine. */ |
| #define pci_dac_dma_supported(pci_dev, mask) (1) |
| |
| static inline dma64_addr_t pci_dac_page_to_dma(struct pci_dev *pdev, |
| struct page *page, unsigned long offset, int direction) |
| { |
| dma64_addr_t addr = page_to_phys(page) + offset; |
| |
| return (dma64_addr_t) bus_to_baddr(pdev->bus, addr); |
| } |
| |
| static inline struct page *pci_dac_dma_to_page(struct pci_dev *pdev, |
| dma64_addr_t dma_addr) |
| { |
| unsigned long poff = baddr_to_bus(pdev->bus, dma_addr) >> PAGE_SHIFT; |
| |
| return mem_map + poff; |
| } |
| |
| 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) |
| { |
| unsigned long addr; |
| |
| if (direction == PCI_DMA_NONE) |
| BUG(); |
| |
| addr = baddr_to_bus(pdev->bus, dma_addr) + PAGE_OFFSET; |
| dma_cache_wback_inv(addr, len); |
| } |
| |
| /* |
| * Return the index of the PCI controller for device. |
| */ |
| #define pci_controller_num(pdev) ({ (void)(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) |
| |
| #endif /* __KERNEL__ */ |
| |
| #endif /* _ASM_PCI_H */ |