249 lines
6.9 KiB
C
Executable File
249 lines
6.9 KiB
C
Executable File
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#ifndef _ASM_PCI_H
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#define _ASM_PCI_H
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#include <linux/config.h>
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#ifdef __KERNEL__
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/* Can be used to override the logic in pci_scan_bus for skipping
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already-configured bus numbers - to be used for buggy BIOSes
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or architectures with incomplete PCI setup by the loader */
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#ifdef CONFIG_PCI
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extern unsigned int pcibios_assign_all_busses(void);
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#else
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//#define pcibios_assign_all_busses() 0 //lobo del
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#define pcibios_assign_all_busses() 1 //lobo add
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#endif
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#define PCIBIOS_MIN_IO 0x1000
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#define PCIBIOS_MIN_MEM 0x10000000
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extern inline void pcibios_set_master(struct pci_dev *dev)
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{
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/* No special bus mastering setup handling */
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}
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extern inline void pcibios_penalize_isa_irq(int irq)
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{
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/* We don't do dynamic PCI IRQ allocation */
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}
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/*
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* Dynamic DMA mapping stuff.
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* MIPS has everything mapped statically.
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*/
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#include <linux/config.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <asm/scatterlist.h>
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#include <linux/string.h>
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#include <asm/io.h>
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#if (defined(CONFIG_DDB5074) || defined(CONFIG_DDB5476))
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#undef PCIBIOS_MIN_IO
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#undef PCIBIOS_MIN_MEM
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#define PCIBIOS_MIN_IO 0x0100000
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#define PCIBIOS_MIN_MEM 0x1000000
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#endif
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struct pci_dev;
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/*
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* Allocate and map kernel buffer using consistent mode DMA for a device.
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* hwdev should be valid struct pci_dev pointer for PCI devices,
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* NULL for PCI-like buses (ISA, EISA).
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* Returns non-NULL cpu-view pointer to the buffer if successful and
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* sets *dma_addrp to the pci side dma address as well, else *dma_addrp
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* is undefined.
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*/
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extern void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size,
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dma_addr_t *dma_handle);
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/*
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* Free and unmap a consistent DMA buffer.
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* cpu_addr is what was returned from pci_alloc_consistent,
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* size must be the same as what as passed into pci_alloc_consistent,
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* and likewise dma_addr must be the same as what *dma_addrp was set to.
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*
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* References to the memory and mappings associated with cpu_addr/dma_addr
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* past this call are illegal.
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*/
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extern void pci_free_consistent(struct pci_dev *hwdev, size_t size,
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void *vaddr, dma_addr_t dma_handle);
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/*
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* Map a single buffer of the indicated size for DMA in streaming mode.
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* The 32-bit bus address to use is returned.
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*
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* Once the device is given the dma address, the device owns this memory
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* until either pci_unmap_single or pci_dma_sync_single is performed.
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*/
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extern inline dma_addr_t pci_map_single(struct pci_dev *hwdev, void *ptr,
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size_t size, int direction)
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{
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if (direction == PCI_DMA_NONE)
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BUG();
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#ifndef CONFIG_COHERENT_IO
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dma_cache_wback_inv((unsigned long)ptr, size);
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#endif
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return virt_to_bus(ptr);
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}
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/*
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* Unmap a single streaming mode DMA translation. The dma_addr and size
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* must match what was provided for in a previous pci_map_single call. All
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* other usages are undefined.
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*
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* After this call, reads by the cpu to the buffer are guarenteed to see
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* whatever the device wrote there.
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*/
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extern inline void pci_unmap_single(struct pci_dev *hwdev, dma_addr_t dma_addr,
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size_t size, int direction)
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{
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if (direction == PCI_DMA_NONE)
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BUG();
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/* Nothing to do */
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}
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/*
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* Map a set of buffers described by scatterlist in streaming
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* mode for DMA. This is the scather-gather version of the
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* above pci_map_single interface. Here the scatter gather list
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* elements are each tagged with the appropriate dma address
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* and length. They are obtained via sg_dma_{address,length}(SG).
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*
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* NOTE: An implementation may be able to use a smaller number of
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* DMA address/length pairs than there are SG table elements.
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* (for example via virtual mapping capabilities)
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* The routine returns the number of addr/length pairs actually
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* used, at most nents.
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*
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* Device ownership issues as mentioned above for pci_map_single are
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* the same here.
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*/
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extern inline int pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sg,
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int nents, int direction)
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{
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#ifndef CONFIG_COHERENT_IO
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int i;
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#endif
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if (direction == PCI_DMA_NONE)
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BUG();
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#ifndef CONFIG_COHERENT_IO
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/* Make sure that gcc doesn't leave the empty loop body. */
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for (i = 0; i < nents; i++, sg++)
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dma_cache_wback_inv((unsigned long)sg->address, sg->length);
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#endif
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return nents;
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}
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/*
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* Unmap a set of streaming mode DMA translations.
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* Again, cpu read rules concerning calls here are the same as for
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* pci_unmap_single() above.
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*/
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extern inline void pci_unmap_sg(struct pci_dev *hwdev, struct scatterlist *sg,
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int nents, int direction)
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{
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if (direction == PCI_DMA_NONE)
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BUG();
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/* Nothing to do */
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}
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/*
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* Make physical memory consistent for a single
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* streaming mode DMA translation after a transfer.
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*
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* If you perform a pci_map_single() but wish to interrogate the
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* buffer using the cpu, yet do not wish to teardown the PCI dma
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* mapping, you must call this function before doing so. At the
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* next point you give the PCI dma address back to the card, the
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* device again owns the buffer.
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*/
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extern inline void pci_dma_sync_single(struct pci_dev *hwdev,
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dma_addr_t dma_handle,
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size_t size, int direction)
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{
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if (direction == PCI_DMA_NONE)
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BUG();
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#ifndef CONFIG_COHERENT_IO
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dma_cache_wback_inv((unsigned long)bus_to_virt(dma_handle), size);
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#endif
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}
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/*
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* Make physical memory consistent for a set of streaming
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* mode DMA translations after a transfer.
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*
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* The same as pci_dma_sync_single but for a scatter-gather list,
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* same rules and usage.
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*/
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extern inline void pci_dma_sync_sg(struct pci_dev *hwdev,
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struct scatterlist *sg,
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int nelems, int direction)
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{
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#ifndef CONFIG_COHERENT_IO
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int i;
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#endif
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if (direction == PCI_DMA_NONE)
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BUG();
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/* Make sure that gcc doesn't leave the empty loop body. */
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#ifndef CONFIG_COHERENT_IO
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for (i = 0; i < nelems; i++, sg++)
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dma_cache_wback_inv((unsigned long)sg->address, sg->length);
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#endif
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}
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/* Return whether the given PCI device DMA address mask can
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* be supported properly. For example, if your device can
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* only drive the low 24-bits during PCI bus mastering, then
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* you would pass 0x00ffffff as the mask to this function.
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*/
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extern inline int pci_dma_supported(struct pci_dev *hwdev, u64 mask)
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{
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/*
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* we fall back to GFP_DMA when the mask isn't all 1s,
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* so we can't guarantee allocations that must be
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* within a tighter range than GFP_DMA..
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*/
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if (mask < 0x1fffffff)
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return 0;
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return 1;
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}
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/* Return the index of the PCI controller for device. */
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#define pci_controller_num(pdev) (0)
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/*
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* These macros should be used after a pci_map_sg call has been done
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* to get bus addresses of each of the SG entries and their lengths.
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* You should only work with the number of sg entries pci_map_sg
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* returns, or alternatively stop on the first sg_dma_len(sg) which
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* is 0.
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*/
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#define sg_dma_address(sg) (virt_to_bus((sg)->address))
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#define sg_dma_len(sg) ((sg)->length)
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#endif /* __KERNEL__ */
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#endif /* _ASM_PCI_H */
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