/*
 *      linux/arch/alpha/kernel/pci-noop.c
 *
 * Stub PCI interfaces for Jensen-specific kernels.
 */

#include <linux/pci.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/capability.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/dma-mapping.h>
#include <linux/scatterlist.h>

#include "proto.h"


/*
 * The PCI controller list.
 */

struct pci_controller *hose_head, **hose_tail = &hose_head;
struct pci_controller *pci_isa_hose;


struct pci_controller * __init
alloc_pci_controller(void)
{
        struct pci_controller *hose;

        hose = alloc_bootmem(sizeof(*hose));

        *hose_tail = hose;
        hose_tail = &hose->next;

        return hose;
}

struct resource * __init
alloc_resource(void)
{
        struct resource *res;

        res = alloc_bootmem(sizeof(*res));

        return res;
}

asmlinkage long
sys_pciconfig_iobase(long which, unsigned long bus, unsigned long dfn)
{
        struct pci_controller *hose;

        /* from hose or from bus.devfn */
        if (which & IOBASE_FROM_HOSE) {
                for (hose = hose_head; hose; hose = hose->next) 
                        if (hose->index == bus)
                                break;
                if (!hose)
                        return -ENODEV;
        } else {
                /* Special hook for ISA access.  */
                if (bus == 0 && dfn == 0)
                        hose = pci_isa_hose;
                else
                        return -ENODEV;
        }

        switch (which & ~IOBASE_FROM_HOSE) {
        case IOBASE_HOSE:
                return hose->index;
        case IOBASE_SPARSE_MEM:
                return hose->sparse_mem_base;
        case IOBASE_DENSE_MEM:
                return hose->dense_mem_base;
        case IOBASE_SPARSE_IO:
                return hose->sparse_io_base;
        case IOBASE_DENSE_IO:
                return hose->dense_io_base;
        case IOBASE_ROOT_BUS:
                return hose->bus->number;
        }

        return -EOPNOTSUPP;
}

asmlinkage long
sys_pciconfig_read(unsigned long bus, unsigned long dfn,
                   unsigned long off, unsigned long len, void *buf)
{
        if (!capable(CAP_SYS_ADMIN))
                return -EPERM;
        else
                return -ENODEV;
}

asmlinkage long
sys_pciconfig_write(unsigned long bus, unsigned long dfn,
                    unsigned long off, unsigned long len, void *buf)
{
        if (!capable(CAP_SYS_ADMIN))
                return -EPERM;
        else
                return -ENODEV;
}

/* Stubs for the routines in pci_iommu.c: */

void *
__pci_alloc_consistent(struct pci_dev *pdev, size_t size,
                       dma_addr_t *dma_addrp, gfp_t gfp)
{
        return NULL;
}

void
pci_free_consistent(struct pci_dev *pdev, size_t size, void *cpu_addr,
                    dma_addr_t dma_addr)
{
}

dma_addr_t
pci_map_single(struct pci_dev *pdev, void *cpu_addr, size_t size,
               int direction)
{
        return (dma_addr_t) 0;
}

void
pci_unmap_single(struct pci_dev *pdev, dma_addr_t dma_addr, size_t size,
                 int direction)
{
}

int
pci_map_sg(struct pci_dev *pdev, struct scatterlist *sg, int nents,
           int direction)
{
        return 0;
}

void
pci_unmap_sg(struct pci_dev *pdev, struct scatterlist *sg, int nents,
             int direction)
{
}

int
pci_dma_supported(struct pci_dev *hwdev, dma_addr_t mask)
{
        return 0;
}

/* Generic DMA mapping functions: */

void *
dma_alloc_coherent(struct device *dev, size_t size,
                   dma_addr_t *dma_handle, gfp_t gfp)
{
        void *ret;

        if (!dev || *dev->dma_mask >= 0xffffffffUL)
                gfp &= ~GFP_DMA;
        ret = (void *)__get_free_pages(gfp, get_order(size));
        if (ret) {
                memset(ret, 0, size);
                *dma_handle = virt_to_phys(ret);
        }
        return ret;
}

EXPORT_SYMBOL(dma_alloc_coherent);

int
dma_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
           enum dma_data_direction direction)
{
        int i;
        struct scatterlist *sg;

        for_each_sg(sgl, sg, nents, i) {
                void *va;

                BUG_ON(!sg_page(sg));
                va = sg_virt(sg);
                sg_dma_address(sg) = (dma_addr_t)virt_to_phys(va);
                sg_dma_len(sg) = sg->length;
        }

        return nents;
}

EXPORT_SYMBOL(dma_map_sg);

int
dma_set_mask(struct device *dev, u64 mask)
{
        if (!dev->dma_mask || !dma_supported(dev, mask))
                return -EIO;

        *dev->dma_mask = mask;

        return 0;
}
EXPORT_SYMBOL(dma_set_mask);

void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
{
        return NULL;
}

void pci_iounmap(struct pci_dev *dev, void __iomem * addr)
{
}

EXPORT_SYMBOL(pci_iomap);
EXPORT_SYMBOL(pci_iounmap);