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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 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_nop(void)
{
/* just return success */
return 0;
}
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;
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;
}
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_nop,
.free_gatt_table = alpha_core_agp_nop,
.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,
};
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 = kmalloc(sizeof(struct pci_dev), GFP_KERNEL);
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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