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linux/drivers/char/agp/ali-agp.c
Keir Fraser 07eee78ea8 [PATCH] AGP fix for Xen VMM 
When Linux is running on the Xen virtual machine monitor, physical
addresses are virtualised and cannot be directly referenced by the AGP
GART.  This patch fixes the GART driver for Xen by adding a layer of
abstraction between physical addresses and 'GART addresses'.

Architecture-specific functions are also defined for allocating and freeing
the GATT.  Xen requires this to ensure that table really is contiguous from
the point of view of the GART.

These extra interface functions are defined as 'no-ops' for all existing
architectures that use the GART driver.

Signed-off-by: Keir Fraser <keir@xensource.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Dave Jones <davej@redhat.com>
2005-06-07 12:35:43 -07:00

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/*
* ALi AGPGART routines.
*/
#include <linux/types.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/agp_backend.h>
#include "agp.h"
#define ALI_AGPCTRL 0xb8
#define ALI_ATTBASE 0xbc
#define ALI_TLBCTRL 0xc0
#define ALI_TAGCTRL 0xc4
#define ALI_CACHE_FLUSH_CTRL 0xD0
#define ALI_CACHE_FLUSH_ADDR_MASK 0xFFFFF000
#define ALI_CACHE_FLUSH_EN 0x100
static int ali_fetch_size(void)
{
int i;
u32 temp;
struct aper_size_info_32 *values;
pci_read_config_dword(agp_bridge->dev, ALI_ATTBASE, &temp);
temp &= ~(0xfffffff0);
values = A_SIZE_32(agp_bridge->driver->aperture_sizes);
for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
if (temp == 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;
}
static void ali_tlbflush(struct agp_memory *mem)
{
u32 temp;
pci_read_config_dword(agp_bridge->dev, ALI_TLBCTRL, &temp);
temp &= 0xfffffff0;
temp |= (1<<0 | 1<<1);
pci_write_config_dword(agp_bridge->dev, ALI_TAGCTRL, temp);
}
static void ali_cleanup(void)
{
struct aper_size_info_32 *previous_size;
u32 temp;
previous_size = A_SIZE_32(agp_bridge->previous_size);
pci_read_config_dword(agp_bridge->dev, ALI_TLBCTRL, &temp);
// clear tag
pci_write_config_dword(agp_bridge->dev, ALI_TAGCTRL,
((temp & 0xffffff00) | 0x00000001|0x00000002));
pci_read_config_dword(agp_bridge->dev, ALI_ATTBASE, &temp);
pci_write_config_dword(agp_bridge->dev, ALI_ATTBASE,
((temp & 0x00000ff0) | previous_size->size_value));
}
static int ali_configure(void)
{
u32 temp;
struct aper_size_info_32 *current_size;
current_size = A_SIZE_32(agp_bridge->current_size);
/* aperture size and gatt addr */
pci_read_config_dword(agp_bridge->dev, ALI_ATTBASE, &temp);
temp = (((temp & 0x00000ff0) | (agp_bridge->gatt_bus_addr & 0xfffff000))
| (current_size->size_value & 0xf));
pci_write_config_dword(agp_bridge->dev, ALI_ATTBASE, temp);
/* tlb control */
pci_read_config_dword(agp_bridge->dev, ALI_TLBCTRL, &temp);
pci_write_config_dword(agp_bridge->dev, ALI_TLBCTRL, ((temp & 0xffffff00) | 0x00000010));
/* address to map to */
pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &temp);
agp_bridge->gart_bus_addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
#if 0
if (agp_bridge->type == ALI_M1541) {
u32 nlvm_addr = 0;
switch (current_size->size_value) {
case 0: break;
case 1: nlvm_addr = 0x100000;break;
case 2: nlvm_addr = 0x200000;break;
case 3: nlvm_addr = 0x400000;break;
case 4: nlvm_addr = 0x800000;break;
case 6: nlvm_addr = 0x1000000;break;
case 7: nlvm_addr = 0x2000000;break;
case 8: nlvm_addr = 0x4000000;break;
case 9: nlvm_addr = 0x8000000;break;
case 10: nlvm_addr = 0x10000000;break;
default: break;
}
nlvm_addr--;
nlvm_addr&=0xfff00000;
nlvm_addr+= agp_bridge->gart_bus_addr;
nlvm_addr|=(agp_bridge->gart_bus_addr>>12);
printk(KERN_INFO PFX "nlvm top &base = %8x\n",nlvm_addr);
}
#endif
pci_read_config_dword(agp_bridge->dev, ALI_TLBCTRL, &temp);
temp &= 0xffffff7f; //enable TLB
pci_write_config_dword(agp_bridge->dev, ALI_TLBCTRL, temp);
return 0;
}
static void m1541_cache_flush(void)
{
int i, page_count;
u32 temp;
global_cache_flush();
page_count = 1 << A_SIZE_32(agp_bridge->current_size)->page_order;
for (i = 0; i < PAGE_SIZE * page_count; i += PAGE_SIZE) {
pci_read_config_dword(agp_bridge->dev, ALI_CACHE_FLUSH_CTRL,
&temp);
pci_write_config_dword(agp_bridge->dev, ALI_CACHE_FLUSH_CTRL,
(((temp & ALI_CACHE_FLUSH_ADDR_MASK) |
(agp_bridge->gatt_bus_addr + i)) |
ALI_CACHE_FLUSH_EN));
}
}
static void *m1541_alloc_page(struct agp_bridge_data *bridge)
{
void *addr = agp_generic_alloc_page(agp_bridge);
u32 temp;
if (!addr)
return NULL;
pci_read_config_dword(agp_bridge->dev, ALI_CACHE_FLUSH_CTRL, &temp);
pci_write_config_dword(agp_bridge->dev, ALI_CACHE_FLUSH_CTRL,
(((temp & ALI_CACHE_FLUSH_ADDR_MASK) |
virt_to_gart(addr)) | ALI_CACHE_FLUSH_EN ));
return addr;
}
static void ali_destroy_page(void * addr)
{
if (addr) {
global_cache_flush(); /* is this really needed? --hch */
agp_generic_destroy_page(addr);
}
}
static void m1541_destroy_page(void * addr)
{
u32 temp;
if (addr == NULL)
return;
global_cache_flush();
pci_read_config_dword(agp_bridge->dev, ALI_CACHE_FLUSH_CTRL, &temp);
pci_write_config_dword(agp_bridge->dev, ALI_CACHE_FLUSH_CTRL,
(((temp & ALI_CACHE_FLUSH_ADDR_MASK) |
virt_to_gart(addr)) | ALI_CACHE_FLUSH_EN));
agp_generic_destroy_page(addr);
}
/* Setup function */
static struct aper_size_info_32 ali_generic_sizes[7] =
{
{256, 65536, 6, 10},
{128, 32768, 5, 9},
{64, 16384, 4, 8},
{32, 8192, 3, 7},
{16, 4096, 2, 6},
{8, 2048, 1, 4},
{4, 1024, 0, 3}
};
static struct agp_bridge_driver ali_generic_bridge = {
.owner = THIS_MODULE,
.aperture_sizes = ali_generic_sizes,
.size_type = U32_APER_SIZE,
.num_aperture_sizes = 7,
.configure = ali_configure,
.fetch_size = ali_fetch_size,
.cleanup = ali_cleanup,
.tlb_flush = ali_tlbflush,
.mask_memory = agp_generic_mask_memory,
.masks = NULL,
.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 = agp_generic_insert_memory,
.remove_memory = agp_generic_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 = ali_destroy_page,
};
static struct agp_bridge_driver ali_m1541_bridge = {
.owner = THIS_MODULE,
.aperture_sizes = ali_generic_sizes,
.size_type = U32_APER_SIZE,
.num_aperture_sizes = 7,
.configure = ali_configure,
.fetch_size = ali_fetch_size,
.cleanup = ali_cleanup,
.tlb_flush = ali_tlbflush,
.mask_memory = agp_generic_mask_memory,
.masks = NULL,
.agp_enable = agp_generic_enable,
.cache_flush = m1541_cache_flush,
.create_gatt_table = agp_generic_create_gatt_table,
.free_gatt_table = agp_generic_free_gatt_table,
.insert_memory = agp_generic_insert_memory,
.remove_memory = agp_generic_remove_memory,
.alloc_by_type = agp_generic_alloc_by_type,
.free_by_type = agp_generic_free_by_type,
.agp_alloc_page = m1541_alloc_page,
.agp_destroy_page = m1541_destroy_page,
};
static struct agp_device_ids ali_agp_device_ids[] __devinitdata =
{
{
.device_id = PCI_DEVICE_ID_AL_M1541,
.chipset_name = "M1541",
},
{
.device_id = PCI_DEVICE_ID_AL_M1621,
.chipset_name = "M1621",
},
{
.device_id = PCI_DEVICE_ID_AL_M1631,
.chipset_name = "M1631",
},
{
.device_id = PCI_DEVICE_ID_AL_M1632,
.chipset_name = "M1632",
},
{
.device_id = PCI_DEVICE_ID_AL_M1641,
.chipset_name = "M1641",
},
{
.device_id = PCI_DEVICE_ID_AL_M1644,
.chipset_name = "M1644",
},
{
.device_id = PCI_DEVICE_ID_AL_M1647,
.chipset_name = "M1647",
},
{
.device_id = PCI_DEVICE_ID_AL_M1651,
.chipset_name = "M1651",
},
{
.device_id = PCI_DEVICE_ID_AL_M1671,
.chipset_name = "M1671",
},
{
.device_id = PCI_DEVICE_ID_AL_M1681,
.chipset_name = "M1681",
},
{
.device_id = PCI_DEVICE_ID_AL_M1683,
.chipset_name = "M1683",
},
{ }, /* dummy final entry, always present */
};
static int __devinit agp_ali_probe(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
struct agp_device_ids *devs = ali_agp_device_ids;
struct agp_bridge_data *bridge;
u8 hidden_1621_id, cap_ptr;
int j;
cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP);
if (!cap_ptr)
return -ENODEV;
/* probe for known chipsets */
for (j = 0; devs[j].chipset_name; j++) {
if (pdev->device == devs[j].device_id)
goto found;
}
printk(KERN_ERR PFX "Unsupported ALi chipset (device id: %04x)\n",
pdev->device);
return -ENODEV;
found:
bridge = agp_alloc_bridge();
if (!bridge)
return -ENOMEM;
bridge->dev = pdev;
bridge->capndx = cap_ptr;
switch (pdev->device) {
case PCI_DEVICE_ID_AL_M1541:
bridge->driver = &ali_m1541_bridge;
break;
case PCI_DEVICE_ID_AL_M1621:
pci_read_config_byte(pdev, 0xFB, &hidden_1621_id);
switch (hidden_1621_id) {
case 0x31:
devs[j].chipset_name = "M1631";
break;
case 0x32:
devs[j].chipset_name = "M1632";
break;
case 0x41:
devs[j].chipset_name = "M1641";
break;
case 0x43:
devs[j].chipset_name = "M????";
break;
case 0x47:
devs[j].chipset_name = "M1647";
break;
case 0x51:
devs[j].chipset_name = "M1651";
break;
default:
break;
}
/*FALLTHROUGH*/
default:
bridge->driver = &ali_generic_bridge;
}
printk(KERN_INFO PFX "Detected ALi %s chipset\n",
devs[j].chipset_name);
/* 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_ali_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_ali_pci_table[] = {
{
.class = (PCI_CLASS_BRIDGE_HOST << 8),
.class_mask = ~0,
.vendor = PCI_VENDOR_ID_AL,
.device = PCI_ANY_ID,
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
},
{ }
};
MODULE_DEVICE_TABLE(pci, agp_ali_pci_table);
static struct pci_driver agp_ali_pci_driver = {
.name = "agpgart-ali",
.id_table = agp_ali_pci_table,
.probe = agp_ali_probe,
.remove = agp_ali_remove,
};
static int __init agp_ali_init(void)
{
if (agp_off)
return -EINVAL;
return pci_register_driver(&agp_ali_pci_driver);
}
static void __exit agp_ali_cleanup(void)
{
pci_unregister_driver(&agp_ali_pci_driver);
}
module_init(agp_ali_init);
module_exit(agp_ali_cleanup);
MODULE_AUTHOR("Dave Jones <davej@codemonkey.org.uk>");
MODULE_LICENSE("GPL and additional rights");
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