// SPDX-License-Identifier: GPL-2.0-only
/*
* UniNorth AGPGART routines .
*/
#include <linux/module.h>
#include <linux/of.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/pagemap.h>
#include <linux/agp_backend.h>
#include <linux/delay.h>
#include <linux/vmalloc.h>
#include <asm /uninorth.h>
#include <asm /prom.h>
#include <asm /pmac_feature.h>
#include "agp.h"
/*
* NOTES for uninorth3 ( G5 AGP ) supports :
*
* There maybe also possibility to have bigger cache line size for
* agp ( see pmac_pci . c and look for cache line ) . Need to be investigated
* by someone .
*
* PAGE size are hardcoded but this may change , see asm / page . h .
*
* Jerome Glisse < j . glisse @ gmail . com >
*/
static int uninorth_rev;
static int is_u3;
static u32 scratch_value;
#define DEFAULT_APERTURE_SIZE 256
#define DEFAULT_APERTURE_STRING "256"
static char *aperture = NULL;
static int uninorth_fetch_size(void )
{
int i, size = 0 ;
struct aper_size_info_32 *values =
A_SIZE_32(agp_bridge->driver->aperture_sizes);
if (aperture) {
char *save = aperture;
size = memparse(aperture, &aperture) >> 20 ;
aperture = save;
for (i = 0 ; i < agp_bridge->driver->num_aperture_sizes; i++)
if (size == values[i].size)
break ;
if (i == agp_bridge->driver->num_aperture_sizes) {
dev_err(&agp_bridge->dev->dev, "invalid aperture size, "
"using default\n" );
size = 0 ;
aperture = NULL;
}
}
if (!size) {
for (i = 0 ; i < agp_bridge->driver->num_aperture_sizes; i++)
if (values[i].size == DEFAULT_APERTURE_SIZE)
break ;
}
agp_bridge->previous_size =
agp_bridge->current_size = (void *)(values + i);
agp_bridge->aperture_size_idx = i;
return values[i].size;
}
static void uninorth_tlbflush(struct agp_memory *mem)
{
u32 ctrl = UNI_N_CFG_GART_ENABLE;
if (is_u3)
ctrl |= U3_N_CFG_GART_PERFRD;
pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL,
ctrl | UNI_N_CFG_GART_INVAL);
pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL, ctrl);
if (!mem && uninorth_rev <= 0 x30) {
pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL,
ctrl | UNI_N_CFG_GART_2xRESET);
pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL,
ctrl);
}
}
static void uninorth_cleanup(void )
{
u32 tmp;
pci_read_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL, &tmp);
if (!(tmp & UNI_N_CFG_GART_ENABLE))
return ;
tmp |= UNI_N_CFG_GART_INVAL;
pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL, tmp);
pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL, 0 );
if (uninorth_rev <= 0 x30) {
pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL,
UNI_N_CFG_GART_2xRESET);
pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL,
0 );
}
}
static int uninorth_configure(void )
{
struct aper_size_info_32 *current_size;
current_size = A_SIZE_32(agp_bridge->current_size);
dev_info(&agp_bridge->dev->dev, "configuring for size idx: %d\n" ,
current_size->size_value);
/* aperture size and gatt addr */
pci_write_config_dword(agp_bridge->dev,
UNI_N_CFG_GART_BASE,
(agp_bridge->gatt_bus_addr & 0 xfffff000)
| current_size->size_value);
/* HACK ALERT
* UniNorth seem to be buggy enough not to handle properly when
* the AGP aperture isn ' t mapped at bus physical address 0
*/
agp_bridge->gart_bus_addr = 0 ;
#ifdef CONFIG_PPC64
/* Assume U3 or later on PPC64 systems */
/* high 4 bits of GART physical address go in UNI_N_CFG_AGP_BASE */
pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_AGP_BASE,
(agp_bridge->gatt_bus_addr >> 32 ) & 0 xf);
#else
pci_write_config_dword(agp_bridge->dev,
UNI_N_CFG_AGP_BASE, agp_bridge->gart_bus_addr);
#endif
if (is_u3) {
pci_write_config_dword(agp_bridge->dev,
UNI_N_CFG_GART_DUMMY_PAGE,
page_to_phys(agp_bridge->scratch_page_page) >> 12 );
}
return 0 ;
}
static int uninorth_insert_memory(struct agp_memory *mem, off_t pg_start, int type)
{
int i, num_entries;
void *temp;
u32 *gp;
int mask_type;
if (type != mem->type)
return -EINVAL;
mask_type = agp_bridge->driver->agp_type_to_mask_type(agp_bridge, type);
if (mask_type != 0 ) {
/* We know nothing of memory types */
return -EINVAL;
}
if (mem->page_count == 0 )
return 0 ;
temp = agp_bridge->current_size;
num_entries = A_SIZE_32(temp)->num_entries;
if ((pg_start + mem->page_count) > num_entries)
return -EINVAL;
gp = (u32 *) &agp_bridge->gatt_table[pg_start];
for (i = 0 ; i < mem->page_count; ++i) {
if (gp[i] != scratch_value) {
dev_info(&agp_bridge->dev->dev,
"uninorth_insert_memory: entry 0x%x occupied (%x)\n" ,
i, gp[i]);
return -EBUSY;
}
}
for (i = 0 ; i < mem->page_count; i++) {
if (is_u3)
gp[i] = (page_to_phys(mem->pages[i]) >> PAGE_SHIFT) | 0 x80000000UL;
else
gp[i] = cpu_to_le32((page_to_phys(mem->pages[i]) & 0 xFFFFF000UL) |
0 x1UL);
flush_dcache_range((unsigned long )__va(page_to_phys(mem->pages[i])),
(unsigned long )__va(page_to_phys(mem->pages[i]))+0 x1000);
}
mb();
uninorth_tlbflush(mem);
return 0 ;
}
static int uninorth_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
{
size_t i;
u32 *gp;
int mask_type;
if (type != mem->type)
return -EINVAL;
mask_type = agp_bridge->driver->agp_type_to_mask_type(agp_bridge, type);
if (mask_type != 0 ) {
/* We know nothing of memory types */
return -EINVAL;
}
if (mem->page_count == 0 )
return 0 ;
gp = (u32 *) &agp_bridge->gatt_table[pg_start];
for (i = 0 ; i < mem->page_count; ++i) {
gp[i] = scratch_value;
}
mb();
uninorth_tlbflush(mem);
return 0 ;
}
static void uninorth_agp_enable(struct agp_bridge_data *bridge, u32 mode)
{
u32 command, scratch, status;
int timeout;
pci_read_config_dword(bridge->dev,
bridge->capndx + PCI_AGP_STATUS,
&status);
command = agp_collect_device_status(bridge, mode, status);
command |= PCI_AGP_COMMAND_AGP;
if (uninorth_rev == 0 x21) {
/*
* Darwin disable AGP 4 x on this revision , thus we
* may assume it ' s broken . This is an AGP2 controller .
*/
command &= ~AGPSTAT2_4X;
}
if ((uninorth_rev >= 0 x30) && (uninorth_rev <= 0 x33)) {
/*
* We need to set REQ_DEPTH to 7 for U3 versions 1 . 0 , 2 . 1 ,
* 2 . 2 and 2 . 3 , Darwin do so .
*/
if ((command >> AGPSTAT_RQ_DEPTH_SHIFT) > 7 )
command = (command & ~AGPSTAT_RQ_DEPTH)
| (7 << AGPSTAT_RQ_DEPTH_SHIFT);
}
uninorth_tlbflush(NULL);
timeout = 0 ;
do {
pci_write_config_dword(bridge->dev,
bridge->capndx + PCI_AGP_COMMAND,
command);
pci_read_config_dword(bridge->dev,
bridge->capndx + PCI_AGP_COMMAND,
&scratch);
} while ((scratch & PCI_AGP_COMMAND_AGP) == 0 && ++timeout < 1000 );
if ((scratch & PCI_AGP_COMMAND_AGP) == 0 )
dev_err(&bridge->dev->dev, "can't write UniNorth AGP "
"command register\n" );
if (uninorth_rev >= 0 x30) {
/* This is an AGP V3 */
agp_device_command(command, (status & AGPSTAT_MODE_3_0) != 0 );
} else {
/* AGP V2 */
agp_device_command(command, false );
}
uninorth_tlbflush(NULL);
}
#ifdef CONFIG_PM
/*
* These Power Management routines are _ not_ called by the normal PCI PM layer ,
* but directly by the video driver through function pointers in the device
* tree .
*/
static int agp_uninorth_suspend(struct pci_dev *pdev)
{
struct agp_bridge_data *bridge;
u32 cmd;
u8 agp;
struct pci_dev *device = NULL;
bridge = agp_find_bridge(pdev);
if (bridge == NULL)
return -ENODEV;
/* Only one suspend supported */
if (bridge->dev_private_data)
return 0 ;
/* turn off AGP on the video chip, if it was enabled */
for_each_pci_dev(device) {
/* Don't touch the bridge yet, device first */
if (device == pdev)
continue ;
/* Only deal with devices on the same bus here, no Mac has a P2P
* bridge on the AGP port , and mucking around the entire PCI
* tree is source of problems on some machines because of a bug
* in some versions of pci_find_capability ( ) when hitting a dead
* device
*/
if (device->bus != pdev->bus)
continue ;
agp = pci_find_capability(device, PCI_CAP_ID_AGP);
if (!agp)
continue ;
pci_read_config_dword(device, agp + PCI_AGP_COMMAND, &cmd);
if (!(cmd & PCI_AGP_COMMAND_AGP))
continue ;
dev_info(&pdev->dev, "disabling AGP on device %s\n" ,
pci_name(device));
cmd &= ~PCI_AGP_COMMAND_AGP;
pci_write_config_dword(device, agp + PCI_AGP_COMMAND, cmd);
}
/* turn off AGP on the bridge */
agp = pci_find_capability(pdev, PCI_CAP_ID_AGP);
pci_read_config_dword(pdev, agp + PCI_AGP_COMMAND, &cmd);
bridge->dev_private_data = (void *)(long )cmd;
if (cmd & PCI_AGP_COMMAND_AGP) {
dev_info(&pdev->dev, "disabling AGP on bridge\n" );
cmd &= ~PCI_AGP_COMMAND_AGP;
pci_write_config_dword(pdev, agp + PCI_AGP_COMMAND, cmd);
}
/* turn off the GART */
uninorth_cleanup();
return 0 ;
}
static int agp_uninorth_resume(struct pci_dev *pdev)
{
struct agp_bridge_data *bridge;
u32 command;
bridge = agp_find_bridge(pdev);
if (bridge == NULL)
return -ENODEV;
command = (long )bridge->dev_private_data;
bridge->dev_private_data = NULL;
if (!(command & PCI_AGP_COMMAND_AGP))
return 0 ;
uninorth_agp_enable(bridge, command);
return 0 ;
}
#endif /* CONFIG_PM */
static struct {
struct page **pages_arr;
} uninorth_priv;
static int uninorth_create_gatt_table(struct agp_bridge_data *bridge)
{
char *table;
char *table_end;
int size;
int page_order;
int num_entries;
int i;
void *temp;
struct page *page;
/* We can't handle 2 level gatt's */
if (bridge->driver->size_type == LVL2_APER_SIZE)
return -EINVAL;
table = NULL;
i = bridge->aperture_size_idx;
temp = bridge->current_size;
size = page_order = num_entries = 0 ;
do {
size = A_SIZE_32(temp)->size;
page_order = A_SIZE_32(temp)->page_order;
num_entries = A_SIZE_32(temp)->num_entries;
table = (char *) __get_free_pages(GFP_KERNEL, page_order);
if (table == NULL) {
i++;
bridge->current_size = A_IDX32(bridge);
} else {
bridge->aperture_size_idx = i;
}
} while (!table && (i < bridge->driver->num_aperture_sizes));
if (table == NULL)
return -ENOMEM;
uninorth_priv.pages_arr = kmalloc_array(1 << page_order,
sizeof (struct page *),
GFP_KERNEL);
if (uninorth_priv.pages_arr == NULL)
goto enomem;
table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1 );
for (page = virt_to_page(table), i = 0 ; page <= virt_to_page(table_end);
page++, i++) {
SetPageReserved(page);
uninorth_priv.pages_arr[i] = page;
}
bridge->gatt_table_real = (u32 *) table;
/* Need to clear out any dirty data still sitting in caches */
flush_dcache_range((unsigned long )table,
(unsigned long )table_end + 1 );
bridge->gatt_table = vmap(uninorth_priv.pages_arr, (1 << page_order), 0 , PAGE_KERNEL_NCG);
if (bridge->gatt_table == NULL)
goto enomem;
bridge->gatt_bus_addr = virt_to_phys(table);
if (is_u3)
scratch_value = (page_to_phys(agp_bridge->scratch_page_page) >> PAGE_SHIFT) | 0 x80000000UL;
else
scratch_value = cpu_to_le32((page_to_phys(agp_bridge->scratch_page_page) & 0 xFFFFF000UL) |
0 x1UL);
for (i = 0 ; i < num_entries; i++)
bridge->gatt_table[i] = scratch_value;
return 0 ;
enomem:
kfree(uninorth_priv.pages_arr);
if (table)
free_pages((unsigned long )table, page_order);
return -ENOMEM;
}
static int uninorth_free_gatt_table(struct agp_bridge_data *bridge)
{
int page_order;
char *table, *table_end;
void *temp;
struct page *page;
temp = bridge->current_size;
page_order = A_SIZE_32(temp)->page_order;
/* Do not worry about freeing memory, because if this is
* called , then all agp memory is deallocated and removed
* from the table .
*/
vunmap(bridge->gatt_table);
kfree(uninorth_priv.pages_arr);
table = (char *) bridge->gatt_table_real;
table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1 );
for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
ClearPageReserved(page);
free_pages((unsigned long ) bridge->gatt_table_real, page_order);
return 0 ;
}
static void null_cache_flush(void )
{
mb();
}
/* Setup function */
static const struct aper_size_info_32 uninorth_sizes[] =
{
{256 , 65536 , 6 , 64 },
{128 , 32768 , 5 , 32 },
{64 , 16384 , 4 , 16 },
{32 , 8192 , 3 , 8 },
{16 , 4096 , 2 , 4 },
{8 , 2048 , 1 , 2 },
{4 , 1024 , 0 , 1 }
};
/*
* Not sure that u3 supports that high aperture sizes but it
* would strange if it did not : )
*/
static const struct aper_size_info_32 u3_sizes[] =
{
{512 , 131072 , 7 , 128 },
{256 , 65536 , 6 , 64 },
{128 , 32768 , 5 , 32 },
{64 , 16384 , 4 , 16 },
{32 , 8192 , 3 , 8 },
{16 , 4096 , 2 , 4 },
{8 , 2048 , 1 , 2 },
{4 , 1024 , 0 , 1 }
};
const struct agp_bridge_driver uninorth_agp_driver = {
.owner = THIS_MODULE,
.aperture_sizes = (void *)uninorth_sizes,
.size_type = U32_APER_SIZE,
.num_aperture_sizes = ARRAY_SIZE(uninorth_sizes),
.configure = uninorth_configure,
.fetch_size = uninorth_fetch_size,
.cleanup = uninorth_cleanup,
.tlb_flush = uninorth_tlbflush,
.mask_memory = agp_generic_mask_memory,
.masks = NULL,
.cache_flush = null_cache_flush,
.agp_enable = uninorth_agp_enable,
.create_gatt_table = uninorth_create_gatt_table,
.free_gatt_table = uninorth_free_gatt_table,
.insert_memory = uninorth_insert_memory,
.remove_memory = uninorth_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,
.cant_use_aperture = true ,
.needs_scratch_page = true ,
};
const struct agp_bridge_driver u3_agp_driver = {
.owner = THIS_MODULE,
.aperture_sizes = (void *)u3_sizes,
.size_type = U32_APER_SIZE,
.num_aperture_sizes = ARRAY_SIZE(u3_sizes),
.configure = uninorth_configure,
.fetch_size = uninorth_fetch_size,
.cleanup = uninorth_cleanup,
.tlb_flush = uninorth_tlbflush,
.mask_memory = agp_generic_mask_memory,
.masks = NULL,
.cache_flush = null_cache_flush,
.agp_enable = uninorth_agp_enable,
.create_gatt_table = uninorth_create_gatt_table,
.free_gatt_table = uninorth_free_gatt_table,
.insert_memory = uninorth_insert_memory,
.remove_memory = uninorth_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,
.cant_use_aperture = true ,
.needs_scratch_page = true ,
};
static struct agp_device_ids uninorth_agp_device_ids[] = {
{
.device_id = PCI_DEVICE_ID_APPLE_UNI_N_AGP,
.chipset_name = "UniNorth" ,
},
{
.device_id = PCI_DEVICE_ID_APPLE_UNI_N_AGP_P,
.chipset_name = "UniNorth/Pangea" ,
},
{
.device_id = PCI_DEVICE_ID_APPLE_UNI_N_AGP15,
.chipset_name = "UniNorth 1.5" ,
},
{
.device_id = PCI_DEVICE_ID_APPLE_UNI_N_AGP2,
.chipset_name = "UniNorth 2" ,
},
{
.device_id = PCI_DEVICE_ID_APPLE_U3_AGP,
.chipset_name = "U3" ,
},
{
.device_id = PCI_DEVICE_ID_APPLE_U3L_AGP,
.chipset_name = "U3L" ,
},
{
.device_id = PCI_DEVICE_ID_APPLE_U3H_AGP,
.chipset_name = "U3H" ,
},
{
.device_id = PCI_DEVICE_ID_APPLE_IPID2_AGP,
.chipset_name = "UniNorth/Intrepid2" ,
},
};
static int agp_uninorth_probe(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
struct agp_device_ids *devs = uninorth_agp_device_ids;
struct agp_bridge_data *bridge;
struct device_node *uninorth_node;
u8 cap_ptr;
int j;
cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP);
if (cap_ptr == 0 )
return -ENODEV;
/* probe for known chipsets */
for (j = 0 ; devs[j].chipset_name != NULL; ++j) {
if (pdev->device == devs[j].device_id) {
dev_info(&pdev->dev, "Apple %s chipset\n" ,
devs[j].chipset_name);
goto found;
}
}
dev_err(&pdev->dev, "unsupported Apple chipset [%04x/%04x]\n" ,
pdev->vendor, pdev->device);
return -ENODEV;
found:
/* Set revision to 0 if we could not read it. */
uninorth_rev = 0 ;
is_u3 = 0 ;
/* Locate core99 Uni-N */
uninorth_node = of_find_node_by_name(NULL, "uni-n" );
/* Locate G5 u3 */
if (uninorth_node == NULL) {
is_u3 = 1 ;
uninorth_node = of_find_node_by_name(NULL, "u3" );
}
if (uninorth_node) {
const int *revprop = of_get_property(uninorth_node,
"device-rev" , NULL);
if (revprop != NULL)
uninorth_rev = *revprop & 0 x3f;
of_node_put(uninorth_node);
}
#ifdef CONFIG_PM
/* Inform platform of our suspend/resume caps */
pmac_register_agp_pm(pdev, agp_uninorth_suspend, agp_uninorth_resume);
#endif
/* Allocate & setup our driver */
bridge = agp_alloc_bridge();
if (!bridge)
return -ENOMEM;
if (is_u3)
bridge->driver = &u3_agp_driver;
else
bridge->driver = &uninorth_agp_driver;
bridge->dev = pdev;
bridge->capndx = cap_ptr;
bridge->flags = AGP_ERRATA_FASTWRITES;
/* Fill in the mode register */
pci_read_config_dword(pdev, cap_ptr+PCI_AGP_STATUS, &bridge->mode);
pci_set_drvdata(pdev, bridge);
return agp_add_bridge(bridge);
}
static void agp_uninorth_remove(struct pci_dev *pdev)
{
struct agp_bridge_data *bridge = pci_get_drvdata(pdev);
#ifdef CONFIG_PM
/* Inform platform of our suspend/resume caps */
pmac_register_agp_pm(pdev, NULL, NULL);
#endif
agp_remove_bridge(bridge);
agp_put_bridge(bridge);
}
static const struct pci_device_id agp_uninorth_pci_table[] = {
{
.class = (PCI_CLASS_BRIDGE_HOST << 8 ),
.class_mask = ~0 ,
.vendor = PCI_VENDOR_ID_APPLE,
.device = PCI_ANY_ID,
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
},
{ }
};
MODULE_DEVICE_TABLE(pci, agp_uninorth_pci_table);
static struct pci_driver agp_uninorth_pci_driver = {
.name = "agpgart-uninorth" ,
.id_table = agp_uninorth_pci_table,
.probe = agp_uninorth_probe,
.remove = agp_uninorth_remove,
};
static int __init agp_uninorth_init(void )
{
if (agp_off)
return -EINVAL;
return pci_register_driver(&agp_uninorth_pci_driver);
}
static void __exit agp_uninorth_cleanup(void )
{
pci_unregister_driver(&agp_uninorth_pci_driver);
}
module_init(agp_uninorth_init);
module_exit(agp_uninorth_cleanup);
module_param(aperture, charp, 0 );
MODULE_PARM_DESC(aperture,
"Aperture size, must be power of two between 4MB and an\n"
"\t\tupper limit specific to the UniNorth revision.\n"
"\t\tDefault: " DEFAULT_APERTURE_STRING "M" );
MODULE_AUTHOR("Ben Herrenschmidt & Paul Mackerras" );
MODULE_DESCRIPTION("Apple UniNorth & U3 AGP support" );
MODULE_LICENSE("GPL" );
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