linux-sg2042/drivers/char/agp/sgi-agp.c

340 lines
7.7 KiB
C

/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2003-2005 Silicon Graphics, Inc. All Rights Reserved.
*/
/*
* SGI TIOCA AGPGART routines.
*
*/
#include <linux/acpi.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/agp_backend.h>
#include <asm/sn/addrs.h>
#include <asm/sn/io.h>
#include <asm/sn/pcidev.h>
#include <asm/sn/pcibus_provider_defs.h>
#include <asm/sn/tioca_provider.h>
#include "agp.h"
extern int agp_memory_reserved;
extern uint32_t tioca_gart_found;
extern struct list_head tioca_list;
static struct agp_bridge_data **sgi_tioca_agp_bridges;
/*
* The aperature size and related information is set up at TIOCA init time.
* Values for this table will be extracted and filled in at
* sgi_tioca_fetch_size() time.
*/
static struct aper_size_info_fixed sgi_tioca_sizes[] = {
{0, 0, 0},
};
static struct page *sgi_tioca_alloc_page(struct agp_bridge_data *bridge)
{
struct page *page;
int nid;
struct tioca_kernel *info =
(struct tioca_kernel *)bridge->dev_private_data;
nid = info->ca_closest_node;
page = alloc_pages_node(nid, GFP_KERNEL, 0);
if (!page)
return NULL;
get_page(page);
atomic_inc(&agp_bridge->current_memory_agp);
return page;
}
/*
* Flush GART tlb's. Cannot selectively flush based on memory so the mem
* arg is ignored.
*/
static void sgi_tioca_tlbflush(struct agp_memory *mem)
{
tioca_tlbflush(mem->bridge->dev_private_data);
}
/*
* Given an address of a host physical page, turn it into a valid gart
* entry.
*/
static unsigned long
sgi_tioca_mask_memory(struct agp_bridge_data *bridge, dma_addr_t addr,
int type)
{
return tioca_physpage_to_gart(addr);
}
static void sgi_tioca_agp_enable(struct agp_bridge_data *bridge, u32 mode)
{
tioca_fastwrite_enable(bridge->dev_private_data);
}
/*
* sgi_tioca_configure() doesn't have anything to do since the base CA driver
* has alreay set up the GART.
*/
static int sgi_tioca_configure(void)
{
return 0;
}
/*
* Determine gfx aperature size. This has already been determined by the
* CA driver init, so just need to set agp_bridge values accordingly.
*/
static int sgi_tioca_fetch_size(void)
{
struct tioca_kernel *info =
(struct tioca_kernel *)agp_bridge->dev_private_data;
sgi_tioca_sizes[0].size = info->ca_gfxap_size / MB(1);
sgi_tioca_sizes[0].num_entries = info->ca_gfxgart_entries;
return sgi_tioca_sizes[0].size;
}
static int sgi_tioca_create_gatt_table(struct agp_bridge_data *bridge)
{
struct tioca_kernel *info =
(struct tioca_kernel *)bridge->dev_private_data;
bridge->gatt_table_real = (u32 *) info->ca_gfxgart;
bridge->gatt_table = bridge->gatt_table_real;
bridge->gatt_bus_addr = info->ca_gfxgart_base;
return 0;
}
static int sgi_tioca_free_gatt_table(struct agp_bridge_data *bridge)
{
return 0;
}
static int sgi_tioca_insert_memory(struct agp_memory *mem, off_t pg_start,
int type)
{
int num_entries;
size_t i;
off_t j;
void *temp;
struct agp_bridge_data *bridge;
u64 *table;
bridge = mem->bridge;
if (!bridge)
return -EINVAL;
table = (u64 *)bridge->gatt_table;
temp = bridge->current_size;
switch (bridge->driver->size_type) {
case U8_APER_SIZE:
num_entries = A_SIZE_8(temp)->num_entries;
break;
case U16_APER_SIZE:
num_entries = A_SIZE_16(temp)->num_entries;
break;
case U32_APER_SIZE:
num_entries = A_SIZE_32(temp)->num_entries;
break;
case FIXED_APER_SIZE:
num_entries = A_SIZE_FIX(temp)->num_entries;
break;
case LVL2_APER_SIZE:
return -EINVAL;
default:
num_entries = 0;
break;
}
num_entries -= agp_memory_reserved / PAGE_SIZE;
if (num_entries < 0)
num_entries = 0;
if (type != 0 || mem->type != 0) {
return -EINVAL;
}
if ((pg_start + mem->page_count) > num_entries)
return -EINVAL;
j = pg_start;
while (j < (pg_start + mem->page_count)) {
if (table[j])
return -EBUSY;
j++;
}
if (!mem->is_flushed) {
bridge->driver->cache_flush();
mem->is_flushed = true;
}
for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
table[j] =
bridge->driver->mask_memory(bridge,
page_to_phys(mem->pages[i]),
mem->type);
}
bridge->driver->tlb_flush(mem);
return 0;
}
static int sgi_tioca_remove_memory(struct agp_memory *mem, off_t pg_start,
int type)
{
size_t i;
struct agp_bridge_data *bridge;
u64 *table;
bridge = mem->bridge;
if (!bridge)
return -EINVAL;
if (type != 0 || mem->type != 0) {
return -EINVAL;
}
table = (u64 *)bridge->gatt_table;
for (i = pg_start; i < (mem->page_count + pg_start); i++) {
table[i] = 0;
}
bridge->driver->tlb_flush(mem);
return 0;
}
static void sgi_tioca_cache_flush(void)
{
}
/*
* Cleanup. Nothing to do as the CA driver owns the GART.
*/
static void sgi_tioca_cleanup(void)
{
}
static struct agp_bridge_data *sgi_tioca_find_bridge(struct pci_dev *pdev)
{
struct agp_bridge_data *bridge;
list_for_each_entry(bridge, &agp_bridges, list) {
if (bridge->dev->bus == pdev->bus)
break;
}
return bridge;
}
const struct agp_bridge_driver sgi_tioca_driver = {
.owner = THIS_MODULE,
.size_type = U16_APER_SIZE,
.configure = sgi_tioca_configure,
.fetch_size = sgi_tioca_fetch_size,
.cleanup = sgi_tioca_cleanup,
.tlb_flush = sgi_tioca_tlbflush,
.mask_memory = sgi_tioca_mask_memory,
.agp_enable = sgi_tioca_agp_enable,
.cache_flush = sgi_tioca_cache_flush,
.create_gatt_table = sgi_tioca_create_gatt_table,
.free_gatt_table = sgi_tioca_free_gatt_table,
.insert_memory = sgi_tioca_insert_memory,
.remove_memory = sgi_tioca_remove_memory,
.alloc_by_type = agp_generic_alloc_by_type,
.free_by_type = agp_generic_free_by_type,
.agp_alloc_page = sgi_tioca_alloc_page,
.agp_destroy_page = agp_generic_destroy_page,
.agp_type_to_mask_type = agp_generic_type_to_mask_type,
.cant_use_aperture = true,
.needs_scratch_page = false,
.num_aperture_sizes = 1,
};
static int agp_sgi_init(void)
{
unsigned int j;
struct tioca_kernel *info;
struct pci_dev *pdev = NULL;
if (tioca_gart_found)
printk(KERN_INFO PFX "SGI TIO CA GART driver initialized.\n");
else
return 0;
sgi_tioca_agp_bridges = kmalloc(tioca_gart_found *
sizeof(struct agp_bridge_data *),
GFP_KERNEL);
if (!sgi_tioca_agp_bridges)
return -ENOMEM;
j = 0;
list_for_each_entry(info, &tioca_list, ca_list) {
if (list_empty(info->ca_devices))
continue;
list_for_each_entry(pdev, info->ca_devices, bus_list) {
u8 cap_ptr;
if (pdev->class != (PCI_CLASS_DISPLAY_VGA << 8))
continue;
cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP);
if (!cap_ptr)
continue;
}
sgi_tioca_agp_bridges[j] = agp_alloc_bridge();
printk(KERN_INFO PFX "bridge %d = 0x%p\n", j,
sgi_tioca_agp_bridges[j]);
if (sgi_tioca_agp_bridges[j]) {
sgi_tioca_agp_bridges[j]->dev = pdev;
sgi_tioca_agp_bridges[j]->dev_private_data = info;
sgi_tioca_agp_bridges[j]->driver = &sgi_tioca_driver;
sgi_tioca_agp_bridges[j]->gart_bus_addr =
info->ca_gfxap_base;
sgi_tioca_agp_bridges[j]->mode = (0x7D << 24) | /* 126 requests */
(0x1 << 9) | /* SBA supported */
(0x1 << 5) | /* 64-bit addresses supported */
(0x1 << 4) | /* FW supported */
(0x1 << 3) | /* AGP 3.0 mode */
0x2; /* 8x transfer only */
sgi_tioca_agp_bridges[j]->current_size =
sgi_tioca_agp_bridges[j]->previous_size =
(void *)&sgi_tioca_sizes[0];
agp_add_bridge(sgi_tioca_agp_bridges[j]);
}
j++;
}
agp_find_bridge = &sgi_tioca_find_bridge;
return 0;
}
static void agp_sgi_cleanup(void)
{
kfree(sgi_tioca_agp_bridges);
sgi_tioca_agp_bridges = NULL;
}
module_init(agp_sgi_init);
module_exit(agp_sgi_cleanup);
MODULE_LICENSE("GPL and additional rights");