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alpha-agp.c

#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/agp_backend.h>
#include <linux/mm.h>
#include <linux/slab.h>

#include <asm/machvec.h>
#include <asm/agp_backend.h>
#include "../../../arch/alpha/kernel/pci_impl.h"

#include "agp.h"

static struct page *alpha_core_agp_vm_nopage(struct vm_area_struct *vma,
                                   unsigned long address,
                                   int *type)
{
      alpha_agp_info *agp = agp_bridge->dev_private_data;
      dma_addr_t dma_addr;
      unsigned long pa;
      struct page *page;

      dma_addr = address - vma->vm_start + agp->aperture.bus_base;
      pa = agp->ops->translate(agp, dma_addr);

      if (pa == (unsigned long)-EINVAL)
            return NULL;      /* no translation */

      /*
       * Get the page, inc the use count, and return it
       */
      page = virt_to_page(__va(pa));
      get_page(page);
      if (type)
            *type = VM_FAULT_MINOR;
      return page;
}

static struct aper_size_info_fixed alpha_core_agp_sizes[] =
{
      { 0, 0, 0 }, /* filled in by alpha_core_agp_setup */
};

struct vm_operations_struct alpha_core_agp_vm_ops = {
      .nopage = alpha_core_agp_vm_nopage,
};


static int alpha_core_agp_fetch_size(void)
{
      return alpha_core_agp_sizes[0].size;
}

static int alpha_core_agp_configure(void)
{
      alpha_agp_info *agp = agp_bridge->dev_private_data;
      agp_bridge->gart_bus_addr = agp->aperture.bus_base;
      return 0;
}

static void alpha_core_agp_cleanup(void)
{
      alpha_agp_info *agp = agp_bridge->dev_private_data;

      agp->ops->cleanup(agp);
}

static void alpha_core_agp_tlbflush(struct agp_memory *mem)
{
      alpha_agp_info *agp = agp_bridge->dev_private_data;
      alpha_mv.mv_pci_tbi(agp->hose, 0, -1);
}

static void alpha_core_agp_enable(struct agp_bridge_data *bridge, u32 mode)
{
      alpha_agp_info *agp = bridge->dev_private_data;

      agp->mode.lw = agp_collect_device_status(bridge, mode,
                              agp->capability.lw);

      agp->mode.bits.enable = 1;
      agp->ops->configure(agp);

      agp_device_command(agp->mode.lw, 0);
}

static int alpha_core_agp_insert_memory(struct agp_memory *mem, off_t pg_start,
                              int type)
{
      alpha_agp_info *agp = agp_bridge->dev_private_data;
      int num_entries, status;
      void *temp;

      if (type >= AGP_USER_TYPES || mem->type >= AGP_USER_TYPES)
            return -EINVAL;

      temp = agp_bridge->current_size;
      num_entries = A_SIZE_FIX(temp)->num_entries;
      if ((pg_start + mem->page_count) > num_entries)
            return -EINVAL;

      status = agp->ops->bind(agp, pg_start, mem);
      mb();
      alpha_core_agp_tlbflush(mem);

      return status;
}

static int alpha_core_agp_remove_memory(struct agp_memory *mem, off_t pg_start,
                              int type)
{
      alpha_agp_info *agp = agp_bridge->dev_private_data;
      int status;

      status = agp->ops->unbind(agp, pg_start, mem);
      alpha_core_agp_tlbflush(mem);
      return status;
}

static int alpha_core_agp_create_free_gatt_table(struct agp_bridge_data *a)
{
      return 0;
}

struct agp_bridge_driver alpha_core_agp_driver = {
      .owner                  = THIS_MODULE,
      .aperture_sizes         = alpha_core_agp_sizes,
      .num_aperture_sizes     = 1,
      .size_type        = FIXED_APER_SIZE,
      .cant_use_aperture      = 1,
      .masks                  = NULL,

      .fetch_size       = alpha_core_agp_fetch_size,
      .configure        = alpha_core_agp_configure,
      .agp_enable       = alpha_core_agp_enable,
      .cleanup          = alpha_core_agp_cleanup,
      .tlb_flush        = alpha_core_agp_tlbflush,
      .mask_memory            = agp_generic_mask_memory,
      .cache_flush            = global_cache_flush,
      .create_gatt_table      = alpha_core_agp_create_free_gatt_table,
      .free_gatt_table  = alpha_core_agp_create_free_gatt_table,
      .insert_memory          = alpha_core_agp_insert_memory,
      .remove_memory          = alpha_core_agp_remove_memory,
      .alloc_by_type          = agp_generic_alloc_by_type,
      .free_by_type           = agp_generic_free_by_type,
      .agp_alloc_page         = agp_generic_alloc_page,
      .agp_destroy_page = agp_generic_destroy_page,
      .agp_type_to_mask_type  = agp_generic_type_to_mask_type,
};

struct agp_bridge_data *alpha_bridge;

int __init
alpha_core_agp_setup(void)
{
      alpha_agp_info *agp = alpha_mv.agp_info();
      struct pci_dev *pdev;   /* faked */
      struct aper_size_info_fixed *aper_size;

      if (!agp)
            return -ENODEV;
      if (agp->ops->setup(agp))
            return -ENODEV;

      /*
       * Build the aperture size descriptor
       */
      aper_size = alpha_core_agp_sizes;
      aper_size->size = agp->aperture.size / (1024 * 1024);
      aper_size->num_entries = agp->aperture.size / PAGE_SIZE;
      aper_size->page_order = __ffs(aper_size->num_entries / 1024);

      /*
       * Build a fake pci_dev struct
       */
      pdev = alloc_pci_dev();
      if (!pdev)
            return -ENOMEM;
      pdev->vendor = 0xffff;
      pdev->device = 0xffff;
      pdev->sysdata = agp->hose;

      alpha_bridge = agp_alloc_bridge();
      if (!alpha_bridge)
            goto fail;

      alpha_bridge->driver = &alpha_core_agp_driver;
      alpha_bridge->vm_ops = &alpha_core_agp_vm_ops;
      alpha_bridge->current_size = aper_size; /* only 1 size */
      alpha_bridge->dev_private_data = agp;
      alpha_bridge->dev = pdev;
      alpha_bridge->mode = agp->capability.lw;

      printk(KERN_INFO PFX "Detected AGP on hose %d\n", agp->hose->index);
      return agp_add_bridge(alpha_bridge);

 fail:
      kfree(pdev);
      return -ENOMEM;
}

static int __init agp_alpha_core_init(void)
{
      if (agp_off)
            return -EINVAL;
      if (alpha_mv.agp_info)
            return alpha_core_agp_setup();
      return -ENODEV;
}

static void __exit agp_alpha_core_cleanup(void)
{
      agp_remove_bridge(alpha_bridge);
      agp_put_bridge(alpha_bridge);
}

module_init(agp_alpha_core_init);
module_exit(agp_alpha_core_cleanup);

MODULE_AUTHOR("Jeff Wiedemeier <Jeff.Wiedemeier@hp.com>");
MODULE_LICENSE("GPL and additional rights");

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