alpha-agp.c

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#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 int alpha_core_agp_vm_fault(struct vm_area_struct *vma,
                    struct vm_fault *vmf)
{
    alpha_agp_info *agp = agp_bridge->dev_private_data;
    dma_addr_t dma_addr;
    unsigned long pa;
    struct page *page;

    dma_addr = (unsigned long)vmf->virtual_address - vma->vm_start
                        + agp->aperture.bus_base;
    pa = agp->ops->translate(agp, dma_addr);

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

    /*
     * Get the page, inc the use count, and return it
     */
    page = virt_to_page(__va(pa));
    get_page(page);
    vmf->page = page;
    return 0;
}

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

static const struct vm_operations_struct alpha_core_agp_vm_ops = {
    .fault = alpha_core_agp_vm_fault,
};


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, false);
}

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  = true,
    .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_alloc_pages    = agp_generic_alloc_pages,
    .agp_destroy_page   = agp_generic_destroy_page,
    .agp_destroy_pages  = agp_generic_destroy_pages,
    .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 <[email protected]>");
MODULE_LICENSE("GPL and additional rights");