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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / drivers / char / agp / uninorth-agp.c
blob42c0a600b1ac66102d9a5ea7c95266d28edace13
1 /*
2 * UniNorth AGPGART routines.
3 */
4 #include <linux/module.h>
5 #include <linux/pci.h>
6 #include <linux/init.h>
7 #include <linux/pagemap.h>
8 #include <linux/agp_backend.h>
9 #include <linux/delay.h>
10 #include <asm/uninorth.h>
11 #include <asm/pci-bridge.h>
12 #include <asm/prom.h>
13 #include <asm/pmac_feature.h>
14 #include "agp.h"
15
16 /*
17 * NOTES for uninorth3 (G5 AGP) supports :
18 *
19 * There maybe also possibility to have bigger cache line size for
20 * agp (see pmac_pci.c and look for cache line). Need to be investigated
21 * by someone.
22 *
23 * PAGE size are hardcoded but this may change, see asm/page.h.
24 *
25 * Jerome Glisse <j.glisse@gmail.com>
26 */
27 static int uninorth_rev;
28 static int is_u3;
29
30 static char __devinitdata *aperture = NULL;
31
32 static int uninorth_fetch_size(void)
33 {
34 int i, size = 0;
35 struct aper_size_info_32 *values =
36 A_SIZE_32(agp_bridge->driver->aperture_sizes);
37
38 if (aperture) {
39 char *save = aperture;
40
41 size = memparse(aperture, &aperture) >> 20;
42 aperture = save;
43
44 for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++)
45 if (size == values[i].size)
46 break;
47
48 if (i == agp_bridge->driver->num_aperture_sizes) {
49 printk(KERN_ERR PFX "Invalid aperture size, using"
50 " default\n");
51 size = 0;
52 aperture = NULL;
53 }
54 }
55
56 if (!size) {
57 for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++)
58 if (values[i].size == 32)
59 break;
60 }
61
62 agp_bridge->previous_size =
63 agp_bridge->current_size = (void *)(values + i);
64 agp_bridge->aperture_size_idx = i;
65 return values[i].size;
66 }
67
68 static void uninorth_tlbflush(struct agp_memory *mem)
69 {
70 u32 ctrl = UNI_N_CFG_GART_ENABLE;
71
72 if (is_u3)
73 ctrl |= U3_N_CFG_GART_PERFRD;
74 pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL,
75 ctrl | UNI_N_CFG_GART_INVAL);
76 pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL, ctrl);
77
78 if (uninorth_rev <= 0x30) {
79 pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL,
80 ctrl | UNI_N_CFG_GART_2xRESET);
81 pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL,
82 ctrl);
83 }
84 }
85
86 static void uninorth_cleanup(void)
87 {
88 u32 tmp;
89
90 pci_read_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL, &tmp);
91 if (!(tmp & UNI_N_CFG_GART_ENABLE))
92 return;
93 tmp |= UNI_N_CFG_GART_INVAL;
94 pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL, tmp);
95 pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL, 0);
96
97 if (uninorth_rev <= 0x30) {
98 pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL,
99 UNI_N_CFG_GART_2xRESET);
100 pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL,
101 0);
102 }
103 }
104
105 static int uninorth_configure(void)
106 {
107 struct aper_size_info_32 *current_size;
108
109 current_size = A_SIZE_32(agp_bridge->current_size);
110
111 printk(KERN_INFO PFX "configuring for size idx: %d\n",
112 current_size->size_value);
113
114 /* aperture size and gatt addr */
115 pci_write_config_dword(agp_bridge->dev,
116 UNI_N_CFG_GART_BASE,
117 (agp_bridge->gatt_bus_addr & 0xfffff000)
118 | current_size->size_value);
119
120 /* HACK ALERT
121 * UniNorth seem to be buggy enough not to handle properly when
122 * the AGP aperture isn't mapped at bus physical address 0
123 */
124 agp_bridge->gart_bus_addr = 0;
125 #ifdef CONFIG_PPC64
126 /* Assume U3 or later on PPC64 systems */
127 /* high 4 bits of GART physical address go in UNI_N_CFG_AGP_BASE */
128 pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_AGP_BASE,
129 (agp_bridge->gatt_bus_addr >> 32) & 0xf);
130 #else
131 pci_write_config_dword(agp_bridge->dev,
132 UNI_N_CFG_AGP_BASE, agp_bridge->gart_bus_addr);
133 #endif
134
135 if (is_u3) {
136 pci_write_config_dword(agp_bridge->dev,
137 UNI_N_CFG_GART_DUMMY_PAGE,
138 agp_bridge->scratch_page_real >> 12);
139 }
140
141 return 0;
142 }
143
144 static int uninorth_insert_memory(struct agp_memory *mem, off_t pg_start,
145 int type)
146 {
147 int i, j, num_entries;
148 void *temp;
149
150 temp = agp_bridge->current_size;
151 num_entries = A_SIZE_32(temp)->num_entries;
152
153 if (type != 0 || mem->type != 0)
154 /* We know nothing of memory types */
155 return -EINVAL;
156 if ((pg_start + mem->page_count) > num_entries)
157 return -EINVAL;
158
159 j = pg_start;
160
161 while (j < (pg_start + mem->page_count)) {
162 if (agp_bridge->gatt_table[j])
163 return -EBUSY;
164 j++;
165 }
166
167 for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
168 agp_bridge->gatt_table[j] =
169 cpu_to_le32((mem->memory[i] & 0xFFFFF000UL) | 0x1UL);
170 flush_dcache_range((unsigned long)__va(mem->memory[i]),
171 (unsigned long)__va(mem->memory[i])+0x1000);
172 }
173 (void)in_le32((volatile u32*)&agp_bridge->gatt_table[pg_start]);
174 mb();
175 flush_dcache_range((unsigned long)&agp_bridge->gatt_table[pg_start],
176 (unsigned long)&agp_bridge->gatt_table[pg_start + mem->page_count]);
177
178 uninorth_tlbflush(mem);
179 return 0;
180 }
181
182 static int u3_insert_memory(struct agp_memory *mem, off_t pg_start, int type)
183 {
184 int i, num_entries;
185 void *temp;
186 u32 *gp;
187
188 temp = agp_bridge->current_size;
189 num_entries = A_SIZE_32(temp)->num_entries;
190
191 if (type != 0 || mem->type != 0)
192 /* We know nothing of memory types */
193 return -EINVAL;
194 if ((pg_start + mem->page_count) > num_entries)
195 return -EINVAL;
196
197 gp = (u32 *) &agp_bridge->gatt_table[pg_start];
198 for (i = 0; i < mem->page_count; ++i) {
199 if (gp[i]) {
200 printk("u3_insert_memory: entry 0x%x occupied (%x)\n",
201 i, gp[i]);
202 return -EBUSY;
203 }
204 }
205
206 for (i = 0; i < mem->page_count; i++) {
207 gp[i] = (mem->memory[i] >> PAGE_SHIFT) | 0x80000000UL;
208 flush_dcache_range((unsigned long)__va(mem->memory[i]),
209 (unsigned long)__va(mem->memory[i])+0x1000);
210 }
211 mb();
212 flush_dcache_range((unsigned long)gp, (unsigned long) &gp[i]);
213 uninorth_tlbflush(mem);
214
215 return 0;
216 }
217
218 int u3_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
219 {
220 size_t i;
221 u32 *gp;
222
223 if (type != 0 || mem->type != 0)
224 /* We know nothing of memory types */
225 return -EINVAL;
226
227 gp = (u32 *) &agp_bridge->gatt_table[pg_start];
228 for (i = 0; i < mem->page_count; ++i)
229 gp[i] = 0;
230 mb();
231 flush_dcache_range((unsigned long)gp, (unsigned long) &gp[i]);
232 uninorth_tlbflush(mem);
233
234 return 0;
235 }
236
237 static void uninorth_agp_enable(struct agp_bridge_data *bridge, u32 mode)
238 {
239 u32 command, scratch, status;
240 int timeout;
241
242 pci_read_config_dword(bridge->dev,
243 bridge->capndx + PCI_AGP_STATUS,
244 &status);
245
246 command = agp_collect_device_status(bridge, mode, status);
247 command |= PCI_AGP_COMMAND_AGP;
248
249 if (uninorth_rev == 0x21) {
250 /*
251 * Darwin disable AGP 4x on this revision, thus we
252 * may assume it's broken. This is an AGP2 controller.
253 */
254 command &= ~AGPSTAT2_4X;
255 }
256
257 if ((uninorth_rev >= 0x30) && (uninorth_rev <= 0x33)) {
258 /*
259 * We need to to set REQ_DEPTH to 7 for U3 versions 1.0, 2.1,
260 * 2.2 and 2.3, Darwin do so.
261 */
262 if ((command >> AGPSTAT_RQ_DEPTH_SHIFT) > 7)
263 command = (command & ~AGPSTAT_RQ_DEPTH)
264 | (7 << AGPSTAT_RQ_DEPTH_SHIFT);
265 }
266
267 uninorth_tlbflush(NULL);
268
269 timeout = 0;
270 do {
271 pci_write_config_dword(bridge->dev,
272 bridge->capndx + PCI_AGP_COMMAND,
273 command);
274 pci_read_config_dword(bridge->dev,
275 bridge->capndx + PCI_AGP_COMMAND,
276 &scratch);
277 } while ((scratch & PCI_AGP_COMMAND_AGP) == 0 && ++timeout < 1000);
278 if ((scratch & PCI_AGP_COMMAND_AGP) == 0)
279 printk(KERN_ERR PFX "failed to write UniNorth AGP"
280 " command register\n");
281
282 if (uninorth_rev >= 0x30) {
283 /* This is an AGP V3 */
284 agp_device_command(command, (status & AGPSTAT_MODE_3_0));
285 } else {
286 /* AGP V2 */
287 agp_device_command(command, 0);
288 }
289
290 uninorth_tlbflush(NULL);
291 }
292
293 #ifdef CONFIG_PM
294 /*
295 * These Power Management routines are _not_ called by the normal PCI PM layer,
296 * but directly by the video driver through function pointers in the device
297 * tree.
298 */
299 static int agp_uninorth_suspend(struct pci_dev *pdev)
300 {
301 struct agp_bridge_data *bridge;
302 u32 cmd;
303 u8 agp;
304 struct pci_dev *device = NULL;
305
306 bridge = agp_find_bridge(pdev);
307 if (bridge == NULL)
308 return -ENODEV;
309
310 /* Only one suspend supported */
311 if (bridge->dev_private_data)
312 return 0;
313
314 /* turn off AGP on the video chip, if it was enabled */
315 for_each_pci_dev(device) {
316 /* Don't touch the bridge yet, device first */
317 if (device == pdev)
318 continue;
319 /* Only deal with devices on the same bus here, no Mac has a P2P
320 * bridge on the AGP port, and mucking around the entire PCI
321 * tree is source of problems on some machines because of a bug
322 * in some versions of pci_find_capability() when hitting a dead
323 * device
324 */
325 if (device->bus != pdev->bus)
326 continue;
327 agp = pci_find_capability(device, PCI_CAP_ID_AGP);
328 if (!agp)
329 continue;
330 pci_read_config_dword(device, agp + PCI_AGP_COMMAND, &cmd);
331 if (!(cmd & PCI_AGP_COMMAND_AGP))
332 continue;
333 printk("uninorth-agp: disabling AGP on device %s\n",
334 pci_name(device));
335 cmd &= ~PCI_AGP_COMMAND_AGP;
336 pci_write_config_dword(device, agp + PCI_AGP_COMMAND, cmd);
337 }
338
339 /* turn off AGP on the bridge */
340 agp = pci_find_capability(pdev, PCI_CAP_ID_AGP);
341 pci_read_config_dword(pdev, agp + PCI_AGP_COMMAND, &cmd);
342 bridge->dev_private_data = (void *)(long)cmd;
343 if (cmd & PCI_AGP_COMMAND_AGP) {
344 printk("uninorth-agp: disabling AGP on bridge %s\n",
345 pci_name(pdev));
346 cmd &= ~PCI_AGP_COMMAND_AGP;
347 pci_write_config_dword(pdev, agp + PCI_AGP_COMMAND, cmd);
348 }
349 /* turn off the GART */
350 uninorth_cleanup();
351
352 return 0;
353 }
354
355 static int agp_uninorth_resume(struct pci_dev *pdev)
356 {
357 struct agp_bridge_data *bridge;
358 u32 command;
359
360 bridge = agp_find_bridge(pdev);
361 if (bridge == NULL)
362 return -ENODEV;
363
364 command = (long)bridge->dev_private_data;
365 bridge->dev_private_data = NULL;
366 if (!(command & PCI_AGP_COMMAND_AGP))
367 return 0;
368
369 uninorth_agp_enable(bridge, command);
370
371 return 0;
372 }
373 #endif /* CONFIG_PM */
374
375 static int uninorth_create_gatt_table(struct agp_bridge_data *bridge)
376 {
377 char *table;
378 char *table_end;
379 int size;
380 int page_order;
381 int num_entries;
382 int i;
383 void *temp;
384 struct page *page;
385
386 /* We can't handle 2 level gatt's */
387 if (bridge->driver->size_type == LVL2_APER_SIZE)
388 return -EINVAL;
389
390 table = NULL;
391 i = bridge->aperture_size_idx;
392 temp = bridge->current_size;
393 size = page_order = num_entries = 0;
394
395 do {
396 size = A_SIZE_32(temp)->size;
397 page_order = A_SIZE_32(temp)->page_order;
398 num_entries = A_SIZE_32(temp)->num_entries;
399
400 table = (char *) __get_free_pages(GFP_KERNEL, page_order);
401
402 if (table == NULL) {
403 i++;
404 bridge->current_size = A_IDX32(bridge);
405 } else {
406 bridge->aperture_size_idx = i;
407 }
408 } while (!table && (i < bridge->driver->num_aperture_sizes));
409
410 if (table == NULL)
411 return -ENOMEM;
412
413 table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
414
415 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
416 SetPageReserved(page);
417
418 bridge->gatt_table_real = (u32 *) table;
419 bridge->gatt_table = (u32 *)table;
420 bridge->gatt_bus_addr = virt_to_gart(table);
421
422 for (i = 0; i < num_entries; i++)
423 bridge->gatt_table[i] = 0;
424
425 flush_dcache_range((unsigned long)table, (unsigned long)table_end);
426
427 return 0;
428 }
429
430 static int uninorth_free_gatt_table(struct agp_bridge_data *bridge)
431 {
432 int page_order;
433 char *table, *table_end;
434 void *temp;
435 struct page *page;
436
437 temp = bridge->current_size;
438 page_order = A_SIZE_32(temp)->page_order;
439
440 /* Do not worry about freeing memory, because if this is
441 * called, then all agp memory is deallocated and removed
442 * from the table.
443 */
444
445 table = (char *) bridge->gatt_table_real;
446 table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
447
448 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
449 ClearPageReserved(page);
450
451 free_pages((unsigned long) bridge->gatt_table_real, page_order);
452
453 return 0;
454 }
455
456 void null_cache_flush(void)
457 {
458 mb();
459 }
460
461 /* Setup function */
462
463 static const struct aper_size_info_32 uninorth_sizes[7] =
464 {
465 #if 0 /* Not sure uninorth supports that high aperture sizes */
466 {256, 65536, 6, 64},
467 {128, 32768, 5, 32},
468 {64, 16384, 4, 16},
469 #endif
470 {32, 8192, 3, 8},
471 {16, 4096, 2, 4},
472 {8, 2048, 1, 2},
473 {4, 1024, 0, 1}
474 };
475
476 /*
477 * Not sure that u3 supports that high aperture sizes but it
478 * would strange if it did not :)
479 */
480 static const struct aper_size_info_32 u3_sizes[8] =
481 {
482 {512, 131072, 7, 128},
483 {256, 65536, 6, 64},
484 {128, 32768, 5, 32},
485 {64, 16384, 4, 16},
486 {32, 8192, 3, 8},
487 {16, 4096, 2, 4},
488 {8, 2048, 1, 2},
489 {4, 1024, 0, 1}
490 };
491
492 const struct agp_bridge_driver uninorth_agp_driver = {
493 .owner = THIS_MODULE,
494 .aperture_sizes = (void *)uninorth_sizes,
495 .size_type = U32_APER_SIZE,
496 .num_aperture_sizes = 4,
497 .configure = uninorth_configure,
498 .fetch_size = uninorth_fetch_size,
499 .cleanup = uninorth_cleanup,
500 .tlb_flush = uninorth_tlbflush,
501 .mask_memory = agp_generic_mask_memory,
502 .masks = NULL,
503 .cache_flush = null_cache_flush,
504 .agp_enable = uninorth_agp_enable,
505 .create_gatt_table = uninorth_create_gatt_table,
506 .free_gatt_table = uninorth_free_gatt_table,
507 .insert_memory = uninorth_insert_memory,
508 .remove_memory = agp_generic_remove_memory,
509 .alloc_by_type = agp_generic_alloc_by_type,
510 .free_by_type = agp_generic_free_by_type,
511 .agp_alloc_page = agp_generic_alloc_page,
512 .agp_destroy_page = agp_generic_destroy_page,
513 .agp_type_to_mask_type = agp_generic_type_to_mask_type,
514 .cant_use_aperture = 1,
515 };
516
517 const struct agp_bridge_driver u3_agp_driver = {
518 .owner = THIS_MODULE,
519 .aperture_sizes = (void *)u3_sizes,
520 .size_type = U32_APER_SIZE,
521 .num_aperture_sizes = 8,
522 .configure = uninorth_configure,
523 .fetch_size = uninorth_fetch_size,
524 .cleanup = uninorth_cleanup,
525 .tlb_flush = uninorth_tlbflush,
526 .mask_memory = agp_generic_mask_memory,
527 .masks = NULL,
528 .cache_flush = null_cache_flush,
529 .agp_enable = uninorth_agp_enable,
530 .create_gatt_table = uninorth_create_gatt_table,
531 .free_gatt_table = uninorth_free_gatt_table,
532 .insert_memory = u3_insert_memory,
533 .remove_memory = u3_remove_memory,
534 .alloc_by_type = agp_generic_alloc_by_type,
535 .free_by_type = agp_generic_free_by_type,
536 .agp_alloc_page = agp_generic_alloc_page,
537 .agp_destroy_page = agp_generic_destroy_page,
538 .agp_type_to_mask_type = agp_generic_type_to_mask_type,
539 .cant_use_aperture = 1,
540 .needs_scratch_page = 1,
541 };
542
543 static struct agp_device_ids uninorth_agp_device_ids[] __devinitdata = {
544 {
545 .device_id = PCI_DEVICE_ID_APPLE_UNI_N_AGP,
546 .chipset_name = "UniNorth",
547 },
548 {
549 .device_id = PCI_DEVICE_ID_APPLE_UNI_N_AGP_P,
550 .chipset_name = "UniNorth/Pangea",
551 },
552 {
553 .device_id = PCI_DEVICE_ID_APPLE_UNI_N_AGP15,
554 .chipset_name = "UniNorth 1.5",
555 },
556 {
557 .device_id = PCI_DEVICE_ID_APPLE_UNI_N_AGP2,
558 .chipset_name = "UniNorth 2",
559 },
560 {
561 .device_id = PCI_DEVICE_ID_APPLE_U3_AGP,
562 .chipset_name = "U3",
563 },
564 {
565 .device_id = PCI_DEVICE_ID_APPLE_U3L_AGP,
566 .chipset_name = "U3L",
567 },
568 {
569 .device_id = PCI_DEVICE_ID_APPLE_U3H_AGP,
570 .chipset_name = "U3H",
571 },
572 {
573 .device_id = PCI_DEVICE_ID_APPLE_IPID2_AGP,
574 .chipset_name = "UniNorth/Intrepid2",
575 },
576 };
577
578 static int __devinit agp_uninorth_probe(struct pci_dev *pdev,
579 const struct pci_device_id *ent)
580 {
581 struct agp_device_ids *devs = uninorth_agp_device_ids;
582 struct agp_bridge_data *bridge;
583 struct device_node *uninorth_node;
584 u8 cap_ptr;
585 int j;
586
587 cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP);
588 if (cap_ptr == 0)
589 return -ENODEV;
590
591 /* probe for known chipsets */
592 for (j = 0; devs[j].chipset_name != NULL; ++j) {
593 if (pdev->device == devs[j].device_id) {
594 printk(KERN_INFO PFX "Detected Apple %s chipset\n",
595 devs[j].chipset_name);
596 goto found;
597 }
598 }
599
600 printk(KERN_ERR PFX "Unsupported Apple chipset (device id: %04x).\n",
601 pdev->device);
602 return -ENODEV;
603
604 found:
605 /* Set revision to 0 if we could not read it. */
606 uninorth_rev = 0;
607 is_u3 = 0;
608 /* Locate core99 Uni-N */
609 uninorth_node = of_find_node_by_name(NULL, "uni-n");
610 /* Locate G5 u3 */
611 if (uninorth_node == NULL) {
612 is_u3 = 1;
613 uninorth_node = of_find_node_by_name(NULL, "u3");
614 }
615 if (uninorth_node) {
616 const int *revprop = of_get_property(uninorth_node,
617 "device-rev", NULL);
618 if (revprop != NULL)
619 uninorth_rev = *revprop & 0x3f;
620 of_node_put(uninorth_node);
621 }
622
623 #ifdef CONFIG_PM
624 /* Inform platform of our suspend/resume caps */
625 pmac_register_agp_pm(pdev, agp_uninorth_suspend, agp_uninorth_resume);
626 #endif
627
628 /* Allocate & setup our driver */
629 bridge = agp_alloc_bridge();
630 if (!bridge)
631 return -ENOMEM;
632
633 if (is_u3)
634 bridge->driver = &u3_agp_driver;
635 else
636 bridge->driver = &uninorth_agp_driver;
637
638 bridge->dev = pdev;
639 bridge->capndx = cap_ptr;
640 bridge->flags = AGP_ERRATA_FASTWRITES;
641
642 /* Fill in the mode register */
643 pci_read_config_dword(pdev, cap_ptr+PCI_AGP_STATUS, &bridge->mode);
644
645 pci_set_drvdata(pdev, bridge);
646 return agp_add_bridge(bridge);
647 }
648
649 static void __devexit agp_uninorth_remove(struct pci_dev *pdev)
650 {
651 struct agp_bridge_data *bridge = pci_get_drvdata(pdev);
652
653 #ifdef CONFIG_PM
654 /* Inform platform of our suspend/resume caps */
655 pmac_register_agp_pm(pdev, NULL, NULL);
656 #endif
657
658 agp_remove_bridge(bridge);
659 agp_put_bridge(bridge);
660 }
661
662 static struct pci_device_id agp_uninorth_pci_table[] = {
663 {
664 .class = (PCI_CLASS_BRIDGE_HOST << 8),
665 .class_mask = ~0,
666 .vendor = PCI_VENDOR_ID_APPLE,
667 .device = PCI_ANY_ID,
668 .subvendor = PCI_ANY_ID,
669 .subdevice = PCI_ANY_ID,
670 },
671 { }
672 };
673
674 MODULE_DEVICE_TABLE(pci, agp_uninorth_pci_table);
675
676 static struct pci_driver agp_uninorth_pci_driver = {
677 .name = "agpgart-uninorth",
678 .id_table = agp_uninorth_pci_table,
679 .probe = agp_uninorth_probe,
680 .remove = agp_uninorth_remove,
681 };
682
683 static int __init agp_uninorth_init(void)
684 {
685 if (agp_off)
686 return -EINVAL;
687 return pci_register_driver(&agp_uninorth_pci_driver);
688 }
689
690 static void __exit agp_uninorth_cleanup(void)
691 {
692 pci_unregister_driver(&agp_uninorth_pci_driver);
693 }
694
695 module_init(agp_uninorth_init);
696 module_exit(agp_uninorth_cleanup);
697
698 module_param(aperture, charp, 0);
699 MODULE_PARM_DESC(aperture,
700 "Aperture size, must be power of two between 4MB and an\n"
701 "\t\tupper limit specific to the UniNorth revision.\n"
702 "\t\tDefault: 32M");
703
704 MODULE_AUTHOR("Ben Herrenschmidt & Paul Mackerras");
705 MODULE_LICENSE("GPL");
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