2 * Copyright 2001-2003 SuSE Labs.
3 * Distributed under the GNU public license, v2.
5 * This is a GART driver for the AMD Opteron/Athlon64 on-CPU northbridge.
6 * It also includes support for the AMD 8151 AGP bridge,
7 * although it doesn't actually do much, as all the real
8 * work is done in the northbridge(s).
11 #include <linux/config.h>
12 #include <linux/module.h>
13 #include <linux/pci.h>
14 #include <linux/init.h>
15 #include <linux/agp_backend.h>
16 #include <linux/mmzone.h>
17 #include <asm/page.h> /* PAGE_SIZE */
20 /* Will need to be increased if AMD64 ever goes >8-way. */
21 #define MAX_HAMMER_GARTS 8
25 #define GPTE_COHERENT 2
27 /* Aperture control register bits. */
29 #define DISGARTCPU (1<<4)
30 #define DISGARTIO (1<<5)
32 /* GART cache control register bits. */
33 #define INVGART (1<<0)
34 #define GARTPTEERR (1<<1)
36 /* K8 On-cpu GART registers */
37 #define AMD64_GARTAPERTURECTL 0x90
38 #define AMD64_GARTAPERTUREBASE 0x94
39 #define AMD64_GARTTABLEBASE 0x98
40 #define AMD64_GARTCACHECTL 0x9c
41 #define AMD64_GARTEN (1<<0)
43 /* NVIDIA K8 registers */
44 #define NVIDIA_X86_64_0_APBASE 0x10
45 #define NVIDIA_X86_64_1_APBASE1 0x50
46 #define NVIDIA_X86_64_1_APLIMIT1 0x54
47 #define NVIDIA_X86_64_1_APSIZE 0xa8
48 #define NVIDIA_X86_64_1_APBASE2 0xd8
49 #define NVIDIA_X86_64_1_APLIMIT2 0xdc
51 /* ULi K8 registers */
52 #define ULI_X86_64_BASE_ADDR 0x10
53 #define ULI_X86_64_HTT_FEA_REG 0x50
54 #define ULI_X86_64_ENU_SCR_REG 0x54
57 static struct pci_dev * hammers[MAX_HAMMER_GARTS];
59 static struct resource *aperture_resource;
60 static int __initdata agp_try_unsupported = 1;
62 #define for_each_nb() for(gart_iterator=0;gart_iterator<nr_garts;gart_iterator++)
64 static void flush_amd64_tlb(struct pci_dev *dev)
68 pci_read_config_dword (dev, AMD64_GARTCACHECTL, &tmp);
70 pci_write_config_dword (dev, AMD64_GARTCACHECTL, tmp);
73 static void amd64_tlbflush(struct agp_memory *temp)
77 flush_amd64_tlb(hammers[gart_iterator]);
80 static int amd64_insert_memory(struct agp_memory *mem, off_t pg_start, int type)
82 int i, j, num_entries;
86 num_entries = agp_num_entries();
88 if (type != 0 || mem->type != 0)
91 /* Make sure we can fit the range in the gatt table. */
92 /* FIXME: could wrap */
93 if (((unsigned long)pg_start + mem->page_count) > num_entries)
98 /* gatt table should be empty. */
99 while (j < (pg_start + mem->page_count)) {
100 if (!PGE_EMPTY(agp_bridge, readl(agp_bridge->gatt_table+j)))
105 if (mem->is_flushed == FALSE) {
106 global_cache_flush();
107 mem->is_flushed = TRUE;
110 for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
111 tmp = agp_bridge->driver->mask_memory(agp_bridge,
112 mem->memory[i], mem->type);
114 BUG_ON(tmp & 0xffffff0000000ffcULL);
115 pte = (tmp & 0x000000ff00000000ULL) >> 28;
116 pte |=(tmp & 0x00000000fffff000ULL);
117 pte |= GPTE_VALID | GPTE_COHERENT;
119 writel(pte, agp_bridge->gatt_table+j);
120 readl(agp_bridge->gatt_table+j); /* PCI Posting. */
127 * This hack alters the order element according
128 * to the size of a long. It sucks. I totally disown this, even
129 * though it does appear to work for the most part.
131 static struct aper_size_info_32 amd64_aperture_sizes[7] =
133 {32, 8192, 3+(sizeof(long)/8), 0 },
134 {64, 16384, 4+(sizeof(long)/8), 1<<1 },
135 {128, 32768, 5+(sizeof(long)/8), 1<<2 },
136 {256, 65536, 6+(sizeof(long)/8), 1<<1 | 1<<2 },
137 {512, 131072, 7+(sizeof(long)/8), 1<<3 },
138 {1024, 262144, 8+(sizeof(long)/8), 1<<1 | 1<<3},
139 {2048, 524288, 9+(sizeof(long)/8), 1<<2 | 1<<3}
144 * Get the current Aperture size from the x86-64.
145 * Note, that there may be multiple x86-64's, but we just return
146 * the value from the first one we find. The set_size functions
147 * keep the rest coherent anyway. Or at least should do.
149 static int amd64_fetch_size(void)
154 struct aper_size_info_32 *values;
160 pci_read_config_dword(dev, AMD64_GARTAPERTURECTL, &temp);
162 values = A_SIZE_32(amd64_aperture_sizes);
164 for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
165 if (temp == values[i].size_value) {
166 agp_bridge->previous_size =
167 agp_bridge->current_size = (void *) (values + i);
169 agp_bridge->aperture_size_idx = i;
170 return values[i].size;
177 * In a multiprocessor x86-64 system, this function gets
178 * called once for each CPU.
180 static u64 amd64_configure (struct pci_dev *hammer, u64 gatt_table)
186 /* Address to map to */
187 pci_read_config_dword (hammer, AMD64_GARTAPERTUREBASE, &tmp);
188 aperturebase = tmp << 25;
189 aper_base = (aperturebase & PCI_BASE_ADDRESS_MEM_MASK);
191 /* address of the mappings table */
192 addr = (u64) gatt_table;
196 pci_write_config_dword (hammer, AMD64_GARTTABLEBASE, tmp);
198 /* Enable GART translation for this hammer. */
199 pci_read_config_dword(hammer, AMD64_GARTAPERTURECTL, &tmp);
201 tmp &= ~(DISGARTCPU | DISGARTIO);
202 pci_write_config_dword(hammer, AMD64_GARTAPERTURECTL, tmp);
204 /* keep CPU's coherent. */
205 flush_amd64_tlb (hammer);
211 static struct aper_size_info_32 amd_8151_sizes[7] =
213 {2048, 524288, 9, 0x00000000 }, /* 0 0 0 0 0 0 */
214 {1024, 262144, 8, 0x00000400 }, /* 1 0 0 0 0 0 */
215 {512, 131072, 7, 0x00000600 }, /* 1 1 0 0 0 0 */
216 {256, 65536, 6, 0x00000700 }, /* 1 1 1 0 0 0 */
217 {128, 32768, 5, 0x00000720 }, /* 1 1 1 1 0 0 */
218 {64, 16384, 4, 0x00000730 }, /* 1 1 1 1 1 0 */
219 {32, 8192, 3, 0x00000738 } /* 1 1 1 1 1 1 */
222 static int amd_8151_configure(void)
224 unsigned long gatt_bus = virt_to_gart(agp_bridge->gatt_table_real);
227 /* Configure AGP regs in each x86-64 host bridge. */
229 agp_bridge->gart_bus_addr =
230 amd64_configure(hammers[gart_iterator],gatt_bus);
236 static void amd64_cleanup(void)
241 /* disable gart translation */
242 pci_read_config_dword (hammers[gart_iterator], AMD64_GARTAPERTURECTL, &tmp);
243 tmp &= ~AMD64_GARTEN;
244 pci_write_config_dword (hammers[gart_iterator], AMD64_GARTAPERTURECTL, tmp);
249 static struct agp_bridge_driver amd_8151_driver = {
250 .owner = THIS_MODULE,
251 .aperture_sizes = amd_8151_sizes,
252 .size_type = U32_APER_SIZE,
253 .num_aperture_sizes = 7,
254 .configure = amd_8151_configure,
255 .fetch_size = amd64_fetch_size,
256 .cleanup = amd64_cleanup,
257 .tlb_flush = amd64_tlbflush,
258 .mask_memory = agp_generic_mask_memory,
260 .agp_enable = agp_generic_enable,
261 .cache_flush = global_cache_flush,
262 .create_gatt_table = agp_generic_create_gatt_table,
263 .free_gatt_table = agp_generic_free_gatt_table,
264 .insert_memory = amd64_insert_memory,
265 .remove_memory = agp_generic_remove_memory,
266 .alloc_by_type = agp_generic_alloc_by_type,
267 .free_by_type = agp_generic_free_by_type,
268 .agp_alloc_page = agp_generic_alloc_page,
269 .agp_destroy_page = agp_generic_destroy_page,
272 /* Some basic sanity checks for the aperture. */
273 static int __devinit aperture_valid(u64 aper, u32 size)
277 printk(KERN_ERR PFX "No aperture\n");
280 if (size < 32*1024*1024) {
281 printk(KERN_ERR PFX "Aperture too small (%d MB)\n", size>>20);
284 if (aper + size > 0xffffffff) {
285 printk(KERN_ERR PFX "Aperture out of bounds\n");
288 pfn = aper >> PAGE_SHIFT;
289 for (c = 0; c < size/PAGE_SIZE; c++) {
290 if (!pfn_valid(pfn + c))
292 if (!PageReserved(pfn_to_page(pfn + c))) {
293 printk(KERN_ERR PFX "Aperture pointing to RAM\n");
298 /* Request the Aperture. This catches cases when someone else
299 already put a mapping in there - happens with some very broken BIOS
301 Maybe better to use pci_assign_resource/pci_enable_device instead
302 trusting the bridges? */
303 if (!aperture_resource &&
304 !(aperture_resource = request_mem_region(aper, size, "aperture"))) {
305 printk(KERN_ERR PFX "Aperture conflicts with PCI mapping.\n");
312 * W*s centric BIOS sometimes only set up the aperture in the AGP
313 * bridge, not the northbridge. On AMD64 this is handled early
314 * in aperture.c, but when GART_IOMMU is not enabled or we run
315 * on a 32bit kernel this needs to be redone.
316 * Unfortunately it is impossible to fix the aperture here because it's too late
317 * to allocate that much memory. But at least error out cleanly instead of
320 static __devinit int fix_northbridge(struct pci_dev *nb, struct pci_dev *agp,
323 u32 aper_low, aper_hi;
326 u32 nb_order, nb_base;
329 pci_read_config_dword(nb, 0x90, &nb_order);
330 nb_order = (nb_order >> 1) & 7;
331 pci_read_config_dword(nb, 0x94, &nb_base);
332 nb_aper = nb_base << 25;
333 if (aperture_valid(nb_aper, (32*1024*1024)<<nb_order)) {
337 /* Northbridge seems to contain crap. Try the AGP bridge. */
339 pci_read_config_word(agp, cap+0x14, &apsize);
340 if (apsize == 0xffff)
344 /* Some BIOS use weird encodings not in the AGPv3 table. */
347 order = 7 - hweight16(apsize);
349 pci_read_config_dword(agp, 0x10, &aper_low);
350 pci_read_config_dword(agp, 0x14, &aper_hi);
351 aper = (aper_low & ~((1<<22)-1)) | ((u64)aper_hi << 32);
352 printk(KERN_INFO PFX "Aperture from AGP @ %Lx size %u MB\n", aper, 32 << order);
353 if (order < 0 || !aperture_valid(aper, (32*1024*1024)<<order))
356 pci_write_config_dword(nb, 0x90, order << 1);
357 pci_write_config_dword(nb, 0x94, aper >> 25);
362 static __devinit int cache_nbs (struct pci_dev *pdev, u32 cap_ptr)
364 struct pci_dev *loop_dev = NULL;
367 /* cache pci_devs of northbridges. */
368 while ((loop_dev = pci_get_device(PCI_VENDOR_ID_AMD, 0x1103, loop_dev))
370 if (i == MAX_HAMMER_GARTS) {
371 printk(KERN_ERR PFX "Too many northbridges for AGP\n");
374 if (fix_northbridge(loop_dev, pdev, cap_ptr) < 0) {
375 printk(KERN_ERR PFX "No usable aperture found.\n");
377 /* should port this to i386 */
378 printk(KERN_ERR PFX "Consider rebooting with iommu=memaper=2 to get a good aperture.\n");
382 hammers[i++] = loop_dev;
385 return i == 0 ? -1 : 0;
388 /* Handle AMD 8151 quirks */
389 static void __devinit amd8151_init(struct pci_dev *pdev, struct agp_bridge_data *bridge)
394 pci_read_config_byte(pdev, PCI_REVISION_ID, &rev_id);
396 case 0x01: revstring="A0"; break;
397 case 0x02: revstring="A1"; break;
398 case 0x11: revstring="B0"; break;
399 case 0x12: revstring="B1"; break;
400 case 0x13: revstring="B2"; break;
401 case 0x14: revstring="B3"; break;
402 default: revstring="??"; break;
405 printk (KERN_INFO PFX "Detected AMD 8151 AGP Bridge rev %s\n", revstring);
408 * Work around errata.
409 * Chips before B2 stepping incorrectly reporting v3.5
412 printk (KERN_INFO PFX "Correcting AGP revision (reports 3.5, is really 3.0)\n");
413 bridge->major_version = 3;
414 bridge->minor_version = 0;
419 static const struct aper_size_info_32 uli_sizes[7] =
429 static int __devinit uli_agp_init(struct pci_dev *pdev)
431 u32 httfea,baseaddr,enuscr;
432 struct pci_dev *dev1;
434 unsigned size = amd64_fetch_size();
435 printk(KERN_INFO "Setting up ULi AGP.\n");
436 dev1 = pci_find_slot ((unsigned int)pdev->bus->number,PCI_DEVFN(0,0));
438 printk(KERN_INFO PFX "Detected a ULi chipset, "
439 "but could not fine the secondary device.\n");
443 for (i = 0; i < ARRAY_SIZE(uli_sizes); i++)
444 if (uli_sizes[i].size == size)
447 if (i == ARRAY_SIZE(uli_sizes)) {
448 printk(KERN_INFO PFX "No ULi size found for %d\n", size);
452 /* shadow x86-64 registers into ULi registers */
453 pci_read_config_dword (hammers[0], AMD64_GARTAPERTUREBASE, &httfea);
455 /* if x86-64 aperture base is beyond 4G, exit here */
456 if ((httfea & 0x7fff) >> (32 - 25))
459 httfea = (httfea& 0x7fff) << 25;
461 pci_read_config_dword(pdev, ULI_X86_64_BASE_ADDR, &baseaddr);
462 baseaddr&= ~PCI_BASE_ADDRESS_MEM_MASK;
464 pci_write_config_dword(pdev, ULI_X86_64_BASE_ADDR, baseaddr);
466 enuscr= httfea+ (size * 1024 * 1024) - 1;
467 pci_write_config_dword(dev1, ULI_X86_64_HTT_FEA_REG, httfea);
468 pci_write_config_dword(dev1, ULI_X86_64_ENU_SCR_REG, enuscr);
473 static const struct aper_size_info_32 nforce3_sizes[5] =
475 {512, 131072, 7, 0x00000000 },
476 {256, 65536, 6, 0x00000008 },
477 {128, 32768, 5, 0x0000000C },
478 {64, 16384, 4, 0x0000000E },
479 {32, 8192, 3, 0x0000000F }
482 /* Handle shadow device of the Nvidia NForce3 */
483 /* CHECK-ME original 2.4 version set up some IORRs. Check if that is needed. */
484 static int __devinit nforce3_agp_init(struct pci_dev *pdev)
486 u32 tmp, apbase, apbar, aplimit;
487 struct pci_dev *dev1;
489 unsigned size = amd64_fetch_size();
491 printk(KERN_INFO PFX "Setting up Nforce3 AGP.\n");
493 dev1 = pci_find_slot((unsigned int)pdev->bus->number, PCI_DEVFN(11, 0));
495 printk(KERN_INFO PFX "agpgart: Detected an NVIDIA "
496 "nForce3 chipset, but could not find "
497 "the secondary device.\n");
501 for (i = 0; i < ARRAY_SIZE(nforce3_sizes); i++)
502 if (nforce3_sizes[i].size == size)
505 if (i == ARRAY_SIZE(nforce3_sizes)) {
506 printk(KERN_INFO PFX "No NForce3 size found for %d\n", size);
510 pci_read_config_dword(dev1, NVIDIA_X86_64_1_APSIZE, &tmp);
512 tmp |= nforce3_sizes[i].size_value;
513 pci_write_config_dword(dev1, NVIDIA_X86_64_1_APSIZE, tmp);
515 /* shadow x86-64 registers into NVIDIA registers */
516 pci_read_config_dword (hammers[0], AMD64_GARTAPERTUREBASE, &apbase);
518 /* if x86-64 aperture base is beyond 4G, exit here */
519 if ( (apbase & 0x7fff) >> (32 - 25) ) {
520 printk(KERN_INFO PFX "aperture base > 4G\n");
524 apbase = (apbase & 0x7fff) << 25;
526 pci_read_config_dword(pdev, NVIDIA_X86_64_0_APBASE, &apbar);
527 apbar &= ~PCI_BASE_ADDRESS_MEM_MASK;
529 pci_write_config_dword(pdev, NVIDIA_X86_64_0_APBASE, apbar);
531 aplimit = apbase + (size * 1024 * 1024) - 1;
532 pci_write_config_dword(dev1, NVIDIA_X86_64_1_APBASE1, apbase);
533 pci_write_config_dword(dev1, NVIDIA_X86_64_1_APLIMIT1, aplimit);
534 pci_write_config_dword(dev1, NVIDIA_X86_64_1_APBASE2, apbase);
535 pci_write_config_dword(dev1, NVIDIA_X86_64_1_APLIMIT2, aplimit);
540 static int __devinit agp_amd64_probe(struct pci_dev *pdev,
541 const struct pci_device_id *ent)
543 struct agp_bridge_data *bridge;
546 cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP);
550 /* Could check for AGPv3 here */
552 bridge = agp_alloc_bridge();
556 if (pdev->vendor == PCI_VENDOR_ID_AMD &&
557 pdev->device == PCI_DEVICE_ID_AMD_8151_0) {
558 amd8151_init(pdev, bridge);
560 printk(KERN_INFO PFX "Detected AGP bridge %x\n", pdev->devfn);
563 bridge->driver = &amd_8151_driver;
565 bridge->capndx = cap_ptr;
567 /* Fill in the mode register */
568 pci_read_config_dword(pdev, bridge->capndx+PCI_AGP_STATUS, &bridge->mode);
570 if (cache_nbs(pdev, cap_ptr) == -1) {
571 agp_put_bridge(bridge);
575 if (pdev->vendor == PCI_VENDOR_ID_NVIDIA) {
576 int ret = nforce3_agp_init(pdev);
578 agp_put_bridge(bridge);
583 if (pdev->vendor == PCI_VENDOR_ID_AL) {
584 int ret = uli_agp_init(pdev);
586 agp_put_bridge(bridge);
591 pci_set_drvdata(pdev, bridge);
592 return agp_add_bridge(bridge);
595 static void __devexit agp_amd64_remove(struct pci_dev *pdev)
597 struct agp_bridge_data *bridge = pci_get_drvdata(pdev);
599 release_mem_region(virt_to_gart(bridge->gatt_table_real),
600 amd64_aperture_sizes[bridge->aperture_size_idx].size);
601 agp_remove_bridge(bridge);
602 agp_put_bridge(bridge);
607 static int agp_amd64_suspend(struct pci_dev *pdev, pm_message_t state)
609 pci_save_state(pdev);
610 pci_set_power_state(pdev, pci_choose_state(pdev, state));
615 static int agp_amd64_resume(struct pci_dev *pdev)
617 pci_set_power_state(pdev, PCI_D0);
618 pci_restore_state(pdev);
620 return amd_8151_configure();
623 #endif /* CONFIG_PM */
625 static struct pci_device_id agp_amd64_pci_table[] = {
627 .class = (PCI_CLASS_BRIDGE_HOST << 8),
629 .vendor = PCI_VENDOR_ID_AMD,
630 .device = PCI_DEVICE_ID_AMD_8151_0,
631 .subvendor = PCI_ANY_ID,
632 .subdevice = PCI_ANY_ID,
636 .class = (PCI_CLASS_BRIDGE_HOST << 8),
638 .vendor = PCI_VENDOR_ID_AL,
639 .device = PCI_DEVICE_ID_AL_M1689,
640 .subvendor = PCI_ANY_ID,
641 .subdevice = PCI_ANY_ID,
645 .class = (PCI_CLASS_BRIDGE_HOST << 8),
647 .vendor = PCI_VENDOR_ID_VIA,
648 .device = PCI_DEVICE_ID_VIA_K8T800PRO_0,
649 .subvendor = PCI_ANY_ID,
650 .subdevice = PCI_ANY_ID,
654 .class = (PCI_CLASS_BRIDGE_HOST << 8),
656 .vendor = PCI_VENDOR_ID_VIA,
657 .device = PCI_DEVICE_ID_VIA_8385_0,
658 .subvendor = PCI_ANY_ID,
659 .subdevice = PCI_ANY_ID,
661 /* VIA K8M800 / K8N800 */
663 .class = (PCI_CLASS_BRIDGE_HOST << 8),
665 .vendor = PCI_VENDOR_ID_VIA,
666 .device = PCI_DEVICE_ID_VIA_8380_0,
667 .subvendor = PCI_ANY_ID,
668 .subdevice = PCI_ANY_ID,
672 .class = (PCI_CLASS_BRIDGE_HOST << 8),
674 .vendor = PCI_VENDOR_ID_VIA,
675 .device = PCI_DEVICE_ID_VIA_3238_0,
676 .subvendor = PCI_ANY_ID,
677 .subdevice = PCI_ANY_ID,
679 /* VIA K8T800/K8M800/K8N800 */
681 .class = (PCI_CLASS_BRIDGE_HOST << 8),
683 .vendor = PCI_VENDOR_ID_VIA,
684 .device = PCI_DEVICE_ID_VIA_838X_1,
685 .subvendor = PCI_ANY_ID,
686 .subdevice = PCI_ANY_ID,
690 .class = (PCI_CLASS_BRIDGE_HOST << 8),
692 .vendor = PCI_VENDOR_ID_NVIDIA,
693 .device = PCI_DEVICE_ID_NVIDIA_NFORCE3,
694 .subvendor = PCI_ANY_ID,
695 .subdevice = PCI_ANY_ID,
698 .class = (PCI_CLASS_BRIDGE_HOST << 8),
700 .vendor = PCI_VENDOR_ID_NVIDIA,
701 .device = PCI_DEVICE_ID_NVIDIA_NFORCE3S,
702 .subvendor = PCI_ANY_ID,
703 .subdevice = PCI_ANY_ID,
707 .class = (PCI_CLASS_BRIDGE_HOST << 8),
709 .vendor = PCI_VENDOR_ID_SI,
710 .device = PCI_DEVICE_ID_SI_755,
711 .subvendor = PCI_ANY_ID,
712 .subdevice = PCI_ANY_ID,
716 .class = (PCI_CLASS_BRIDGE_HOST << 8),
718 .vendor = PCI_VENDOR_ID_SI,
719 .device = PCI_DEVICE_ID_SI_760,
720 .subvendor = PCI_ANY_ID,
721 .subdevice = PCI_ANY_ID,
725 .class = (PCI_CLASS_BRIDGE_HOST << 8),
727 .vendor = PCI_VENDOR_ID_AL,
729 .subvendor = PCI_ANY_ID,
730 .subdevice = PCI_ANY_ID,
736 MODULE_DEVICE_TABLE(pci, agp_amd64_pci_table);
738 static struct pci_driver agp_amd64_pci_driver = {
739 .name = "agpgart-amd64",
740 .id_table = agp_amd64_pci_table,
741 .probe = agp_amd64_probe,
742 .remove = agp_amd64_remove,
744 .suspend = agp_amd64_suspend,
745 .resume = agp_amd64_resume,
750 /* Not static due to IOMMU code calling it early. */
751 int __init agp_amd64_init(void)
754 static struct pci_device_id amd64nb[] = {
755 { PCI_DEVICE(PCI_VENDOR_ID_AMD, 0x1103) },
761 if (pci_register_driver(&agp_amd64_pci_driver) > 0) {
763 if (!agp_try_unsupported && !agp_try_unsupported_boot) {
764 printk(KERN_INFO PFX "No supported AGP bridge found.\n");
766 printk(KERN_INFO PFX "You can try agp_try_unsupported=1\n");
768 printk(KERN_INFO PFX "You can boot with agp=try_unsupported\n");
773 /* First check that we have at least one AMD64 NB */
774 if (!pci_dev_present(amd64nb))
777 /* Look for any AGP bridge */
780 for_each_pci_dev(dev) {
781 if (!pci_find_capability(dev, PCI_CAP_ID_AGP))
783 /* Only one bridge supported right now */
784 if (agp_amd64_probe(dev, NULL) == 0) {
793 static void __exit agp_amd64_cleanup(void)
795 if (aperture_resource)
796 release_resource(aperture_resource);
797 pci_unregister_driver(&agp_amd64_pci_driver);
800 /* On AMD64 the PCI driver needs to initialize this driver early
801 for the IOMMU, so it has to be called via a backdoor. */
802 #ifndef CONFIG_GART_IOMMU
803 module_init(agp_amd64_init);
804 module_exit(agp_amd64_cleanup);
807 MODULE_AUTHOR("Dave Jones <davej@codemonkey.org.uk>, Andi Kleen");
808 module_param(agp_try_unsupported, bool, 0);
809 MODULE_LICENSE("GPL");