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linux/drivers/char/agp/nvidia-agp.c

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/*
* Nvidia AGPGART routines.
* Based upon a 2.4 agpgart diff by the folks from NVIDIA, and hacked up
* to work in 2.5 by Dave Jones <davej@codemonkey.org.uk>
*/
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/agp_backend.h>
#include <linux/gfp.h>
#include <linux/page-flags.h>
#include <linux/mm.h>
#include "agp.h"
/* NVIDIA registers */
#define NVIDIA_0_APSIZE 0x80
#define NVIDIA_1_WBC 0xf0
#define NVIDIA_2_GARTCTRL 0xd0
#define NVIDIA_2_APBASE 0xd8
#define NVIDIA_2_APLIMIT 0xdc
#define NVIDIA_2_ATTBASE(i) (0xe0 + (i) * 4)
#define NVIDIA_3_APBASE 0x50
#define NVIDIA_3_APLIMIT 0x54
static struct _nvidia_private {
struct pci_dev *dev_1;
struct pci_dev *dev_2;
struct pci_dev *dev_3;
volatile u32 __iomem *aperture;
int num_active_entries;
off_t pg_offset;
u32 wbc_mask;
} nvidia_private;
static int nvidia_fetch_size(void)
{
int i;
u8 size_value;
struct aper_size_info_8 *values;
pci_read_config_byte(agp_bridge->dev, NVIDIA_0_APSIZE, &size_value);
size_value &= 0x0f;
values = A_SIZE_8(agp_bridge->driver->aperture_sizes);
for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
if (size_value == values[i].size_value) {
agp_bridge->previous_size =
agp_bridge->current_size = (void *) (values + i);
agp_bridge->aperture_size_idx = i;
return values[i].size;
}
}
return 0;
}
#define SYSCFG 0xC0010010
#define IORR_BASE0 0xC0010016
#define IORR_MASK0 0xC0010017
#define AMD_K7_NUM_IORR 2
static int nvidia_init_iorr(u32 base, u32 size)
{
u32 base_hi, base_lo;
u32 mask_hi, mask_lo;
u32 sys_hi, sys_lo;
u32 iorr_addr, free_iorr_addr;
/* Find the iorr that is already used for the base */
/* If not found, determine the uppermost available iorr */
free_iorr_addr = AMD_K7_NUM_IORR;
for(iorr_addr = 0; iorr_addr < AMD_K7_NUM_IORR; iorr_addr++) {
rdmsr(IORR_BASE0 + 2 * iorr_addr, base_lo, base_hi);
rdmsr(IORR_MASK0 + 2 * iorr_addr, mask_lo, mask_hi);
if ((base_lo & 0xfffff000) == (base & 0xfffff000))
break;
if ((mask_lo & 0x00000800) == 0)
free_iorr_addr = iorr_addr;
}
if (iorr_addr >= AMD_K7_NUM_IORR) {
iorr_addr = free_iorr_addr;
if (iorr_addr >= AMD_K7_NUM_IORR)
return -EINVAL;
}
base_hi = 0x0;
base_lo = (base & ~0xfff) | 0x18;
mask_hi = 0xf;
mask_lo = ((~(size - 1)) & 0xfffff000) | 0x800;
wrmsr(IORR_BASE0 + 2 * iorr_addr, base_lo, base_hi);
wrmsr(IORR_MASK0 + 2 * iorr_addr, mask_lo, mask_hi);
rdmsr(SYSCFG, sys_lo, sys_hi);
sys_lo |= 0x00100000;
wrmsr(SYSCFG, sys_lo, sys_hi);
return 0;
}
static int nvidia_configure(void)
{
int i, rc, num_dirs;
u32 apbase, aplimit;
struct aper_size_info_8 *current_size;
u32 temp;
current_size = A_SIZE_8(agp_bridge->current_size);
/* aperture size */
pci_write_config_byte(agp_bridge->dev, NVIDIA_0_APSIZE,
current_size->size_value);
/* address to map to */
pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &apbase);
apbase &= PCI_BASE_ADDRESS_MEM_MASK;
agp_bridge->gart_bus_addr = apbase;
aplimit = apbase + (current_size->size * 1024 * 1024) - 1;
pci_write_config_dword(nvidia_private.dev_2, NVIDIA_2_APBASE, apbase);
pci_write_config_dword(nvidia_private.dev_2, NVIDIA_2_APLIMIT, aplimit);
pci_write_config_dword(nvidia_private.dev_3, NVIDIA_3_APBASE, apbase);
pci_write_config_dword(nvidia_private.dev_3, NVIDIA_3_APLIMIT, aplimit);
if (0 != (rc = nvidia_init_iorr(apbase, current_size->size * 1024 * 1024)))
return rc;
/* directory size is 64k */
num_dirs = current_size->size / 64;
nvidia_private.num_active_entries = current_size->num_entries;
nvidia_private.pg_offset = 0;
if (num_dirs == 0) {
num_dirs = 1;
nvidia_private.num_active_entries /= (64 / current_size->size);
nvidia_private.pg_offset = (apbase & (64 * 1024 * 1024 - 1) &
~(current_size->size * 1024 * 1024 - 1)) / PAGE_SIZE;
}
/* attbase */
for(i = 0; i < 8; i++) {
pci_write_config_dword(nvidia_private.dev_2, NVIDIA_2_ATTBASE(i),
(agp_bridge->gatt_bus_addr + (i % num_dirs) * 64 * 1024) | 1);
}
/* gtlb control */
pci_read_config_dword(nvidia_private.dev_2, NVIDIA_2_GARTCTRL, &temp);
pci_write_config_dword(nvidia_private.dev_2, NVIDIA_2_GARTCTRL, temp | 0x11);
/* gart control */
pci_read_config_dword(agp_bridge->dev, NVIDIA_0_APSIZE, &temp);
pci_write_config_dword(agp_bridge->dev, NVIDIA_0_APSIZE, temp | 0x100);
/* map aperture */
nvidia_private.aperture =
(volatile u32 __iomem *) ioremap(apbase, 33 * PAGE_SIZE);
return 0;
}
static void nvidia_cleanup(void)
{
struct aper_size_info_8 *previous_size;
u32 temp;
/* gart control */
pci_read_config_dword(agp_bridge->dev, NVIDIA_0_APSIZE, &temp);
pci_write_config_dword(agp_bridge->dev, NVIDIA_0_APSIZE, temp & ~(0x100));
/* gtlb control */
pci_read_config_dword(nvidia_private.dev_2, NVIDIA_2_GARTCTRL, &temp);
pci_write_config_dword(nvidia_private.dev_2, NVIDIA_2_GARTCTRL, temp & ~(0x11));
/* unmap aperture */
iounmap((void __iomem *) nvidia_private.aperture);
/* restore previous aperture size */
previous_size = A_SIZE_8(agp_bridge->previous_size);
pci_write_config_byte(agp_bridge->dev, NVIDIA_0_APSIZE,
previous_size->size_value);
/* restore iorr for previous aperture size */
nvidia_init_iorr(agp_bridge->gart_bus_addr,
previous_size->size * 1024 * 1024);
}
/*
* Note we can't use the generic routines, even though they are 99% the same.
* Aperture sizes <64M still requires a full 64k GART directory, but
* only use the portion of the TLB entries that correspond to the apertures
* alignment inside the surrounding 64M block.
*/
extern int agp_memory_reserved;
static int nvidia_insert_memory(struct agp_memory *mem, off_t pg_start, int type)
{
int i, j;
if ((type != 0) || (mem->type != 0))
return -EINVAL;
if ((pg_start + mem->page_count) >
(nvidia_private.num_active_entries - agp_memory_reserved/PAGE_SIZE))
return -EINVAL;
for(j = pg_start; j < (pg_start + mem->page_count); j++) {
if (!PGE_EMPTY(agp_bridge, readl(agp_bridge->gatt_table+nvidia_private.pg_offset+j)))
return -EBUSY;
}
if (mem->is_flushed == FALSE) {
global_cache_flush();
mem->is_flushed = TRUE;
}
for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
writel(agp_bridge->driver->mask_memory(agp_bridge,
mem->memory[i], mem->type),
agp_bridge->gatt_table+nvidia_private.pg_offset+j);
readl(agp_bridge->gatt_table+nvidia_private.pg_offset+j); /* PCI Posting. */
}
agp_bridge->driver->tlb_flush(mem);
return 0;
}
static int nvidia_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
{
int i;
if ((type != 0) || (mem->type != 0))
return -EINVAL;
for (i = pg_start; i < (mem->page_count + pg_start); i++)
writel(agp_bridge->scratch_page, agp_bridge->gatt_table+nvidia_private.pg_offset+i);
agp_bridge->driver->tlb_flush(mem);
return 0;
}
static void nvidia_tlbflush(struct agp_memory *mem)
{
unsigned long end;
u32 wbc_reg, temp;
int i;
/* flush chipset */
if (nvidia_private.wbc_mask) {
pci_read_config_dword(nvidia_private.dev_1, NVIDIA_1_WBC, &wbc_reg);
wbc_reg |= nvidia_private.wbc_mask;
pci_write_config_dword(nvidia_private.dev_1, NVIDIA_1_WBC, wbc_reg);
end = jiffies + 3*HZ;
do {
pci_read_config_dword(nvidia_private.dev_1,
NVIDIA_1_WBC, &wbc_reg);
if ((signed)(end - jiffies) <= 0) {
printk(KERN_ERR PFX
"TLB flush took more than 3 seconds.\n");
}
} while (wbc_reg & nvidia_private.wbc_mask);
}
/* flush TLB entries */
for(i = 0; i < 32 + 1; i++)
temp = readl(nvidia_private.aperture+(i * PAGE_SIZE / sizeof(u32)));
for(i = 0; i < 32 + 1; i++)
temp = readl(nvidia_private.aperture+(i * PAGE_SIZE / sizeof(u32)));
}
static struct aper_size_info_8 nvidia_generic_sizes[5] =
{
{512, 131072, 7, 0},
{256, 65536, 6, 8},
{128, 32768, 5, 12},
{64, 16384, 4, 14},
/* The 32M mode still requires a 64k gatt */
{32, 16384, 4, 15}
};
static struct gatt_mask nvidia_generic_masks[] =
{
{ .mask = 1, .type = 0}
};
static struct agp_bridge_driver nvidia_driver = {
.owner = THIS_MODULE,
.aperture_sizes = nvidia_generic_sizes,
.size_type = U8_APER_SIZE,
.num_aperture_sizes = 5,
.configure = nvidia_configure,
.fetch_size = nvidia_fetch_size,
.cleanup = nvidia_cleanup,
.tlb_flush = nvidia_tlbflush,
.mask_memory = agp_generic_mask_memory,
.masks = nvidia_generic_masks,
.agp_enable = agp_generic_enable,
.cache_flush = global_cache_flush,
.create_gatt_table = agp_generic_create_gatt_table,
.free_gatt_table = agp_generic_free_gatt_table,
.insert_memory = nvidia_insert_memory,
.remove_memory = nvidia_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,
};
static int __devinit agp_nvidia_probe(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
struct agp_bridge_data *bridge;
u8 cap_ptr;
nvidia_private.dev_1 =
pci_find_slot((unsigned int)pdev->bus->number, PCI_DEVFN(0, 1));
nvidia_private.dev_2 =
pci_find_slot((unsigned int)pdev->bus->number, PCI_DEVFN(0, 2));
nvidia_private.dev_3 =
pci_find_slot((unsigned int)pdev->bus->number, PCI_DEVFN(30, 0));
if (!nvidia_private.dev_1 || !nvidia_private.dev_2 || !nvidia_private.dev_3) {
printk(KERN_INFO PFX "Detected an NVIDIA nForce/nForce2 "
"chipset, but could not find the secondary devices.\n");
return -ENODEV;
}
cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP);
if (!cap_ptr)
return -ENODEV;
switch (pdev->device) {
case PCI_DEVICE_ID_NVIDIA_NFORCE:
printk(KERN_INFO PFX "Detected NVIDIA nForce chipset\n");
nvidia_private.wbc_mask = 0x00010000;
break;
case PCI_DEVICE_ID_NVIDIA_NFORCE2:
printk(KERN_INFO PFX "Detected NVIDIA nForce2 chipset\n");
nvidia_private.wbc_mask = 0x80000000;
break;
default:
printk(KERN_ERR PFX "Unsupported NVIDIA chipset (device id: %04x)\n",
pdev->device);
return -ENODEV;
}
bridge = agp_alloc_bridge();
if (!bridge)
return -ENOMEM;
bridge->driver = &nvidia_driver;
bridge->dev_private_data = &nvidia_private,
bridge->dev = pdev;
bridge->capndx = cap_ptr;
/* Fill in the mode register */
pci_read_config_dword(pdev,
bridge->capndx+PCI_AGP_STATUS,
&bridge->mode);
pci_set_drvdata(pdev, bridge);
return agp_add_bridge(bridge);
}
static void __devexit agp_nvidia_remove(struct pci_dev *pdev)
{
struct agp_bridge_data *bridge = pci_get_drvdata(pdev);
agp_remove_bridge(bridge);
agp_put_bridge(bridge);
}
static struct pci_device_id agp_nvidia_pci_table[] = {
{
.class = (PCI_CLASS_BRIDGE_HOST << 8),
.class_mask = ~0,
.vendor = PCI_VENDOR_ID_NVIDIA,
.device = PCI_DEVICE_ID_NVIDIA_NFORCE,
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
},
{
.class = (PCI_CLASS_BRIDGE_HOST << 8),
.class_mask = ~0,
.vendor = PCI_VENDOR_ID_NVIDIA,
.device = PCI_DEVICE_ID_NVIDIA_NFORCE2,
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
},
{ }
};
MODULE_DEVICE_TABLE(pci, agp_nvidia_pci_table);
static struct pci_driver agp_nvidia_pci_driver = {
.name = "agpgart-nvidia",
.id_table = agp_nvidia_pci_table,
.probe = agp_nvidia_probe,
.remove = agp_nvidia_remove,
};
static int __init agp_nvidia_init(void)
{
if (agp_off)
return -EINVAL;
return pci_register_driver(&agp_nvidia_pci_driver);
}
static void __exit agp_nvidia_cleanup(void)
{
pci_unregister_driver(&agp_nvidia_pci_driver);
}
module_init(agp_nvidia_init);
module_exit(agp_nvidia_cleanup);
MODULE_LICENSE("GPL and additional rights");
MODULE_AUTHOR("NVIDIA Corporation");
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