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/*

 * 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 */