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pci-noop.c

/*
 *    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/gfp.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;
}

static void *alpha_noop_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;
}

static void alpha_noop_free_coherent(struct device *dev, size_t size,
                             void *cpu_addr, dma_addr_t dma_addr)
{
      free_pages((unsigned long)cpu_addr, get_order(size));
}

static dma_addr_t alpha_noop_map_page(struct device *dev, struct page *page,
                              unsigned long offset, size_t size,
                              enum dma_data_direction dir,
                              struct dma_attrs *attrs)
{
      return page_to_pa(page) + offset;
}

static int alpha_noop_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
                       enum dma_data_direction dir, struct dma_attrs *attrs)
{
      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;
}

static int alpha_noop_mapping_error(struct device *dev, dma_addr_t dma_addr)
{
      return 0;
}

static int alpha_noop_supported(struct device *dev, u64 mask)
{
      return mask < 0x00ffffffUL ? 0 : 1;
}

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

      *dev->dma_mask = mask;
      return 0;
}

struct dma_map_ops alpha_noop_ops = {
      .alloc_coherent         = alpha_noop_alloc_coherent,
      .free_coherent          = alpha_noop_free_coherent,
      .map_page         = alpha_noop_map_page,
      .map_sg                 = alpha_noop_map_sg,
      .mapping_error          = alpha_noop_mapping_error,
      .dma_supported          = alpha_noop_supported,
      .set_dma_mask           = alpha_noop_set_mask,
};

struct dma_map_ops *dma_ops = &alpha_noop_ops;
EXPORT_SYMBOL(dma_ops);

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);

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