1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * UniNorth AGPGART routines.
4 */
5 #include <linux/module.h>
6 #include <linux/of.h>
7 #include <linux/pci.h>
8 #include <linux/slab.h>
9 #include <linux/init.h>
10 #include <linux/pagemap.h>
11 #include <linux/agp_backend.h>
12 #include <linux/delay.h>
13 #include <linux/vmalloc.h>
14 #include <asm/uninorth.h>
15 #include <asm/prom.h>
16 #include <asm/pmac_feature.h>
17 #include "agp.h"
18
19 /*
20 * NOTES for uninorth3 (G5 AGP) supports :
21 *
22 * There maybe also possibility to have bigger cache line size for
23 * agp (see pmac_pci.c and look for cache line). Need to be investigated
24 * by someone.
25 *
26 * PAGE size are hardcoded but this may change, see asm/page.h.
27 *
28 * Jerome Glisse <j.glisse@gmail.com>
29 */
30 static int uninorth_rev;
31 static int is_u3;
32 static u32 scratch_value;
33
34 #define DEFAULT_APERTURE_SIZE 256
35 #define DEFAULT_APERTURE_STRING "256"
36 static char *aperture = NULL;
37
uninorth_fetch_size(void)38 static int uninorth_fetch_size(void)
39 {
40 int i, size = 0;
41 struct aper_size_info_32 *values =
42 A_SIZE_32(agp_bridge->driver->aperture_sizes);
43
44 if (aperture) {
45 char *save = aperture;
46
47 size = memparse(aperture, &aperture) >> 20;
48 aperture = save;
49
50 for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++)
51 if (size == values[i].size)
52 break;
53
54 if (i == agp_bridge->driver->num_aperture_sizes) {
55 dev_err(&agp_bridge->dev->dev, "invalid aperture size, "
56 "using default\n");
57 size = 0;
58 aperture = NULL;
59 }
60 }
61
62 if (!size) {
63 for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++)
64 if (values[i].size == DEFAULT_APERTURE_SIZE)
65 break;
66 }
67
68 agp_bridge->previous_size =
69 agp_bridge->current_size = (void *)(values + i);
70 agp_bridge->aperture_size_idx = i;
71 return values[i].size;
72 }
73
uninorth_tlbflush(struct agp_memory * mem)74 static void uninorth_tlbflush(struct agp_memory *mem)
75 {
76 u32 ctrl = UNI_N_CFG_GART_ENABLE;
77
78 if (is_u3)
79 ctrl |= U3_N_CFG_GART_PERFRD;
80 pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL,
81 ctrl | UNI_N_CFG_GART_INVAL);
82 pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL, ctrl);
83
84 if (!mem && uninorth_rev <= 0x30) {
85 pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL,
86 ctrl | UNI_N_CFG_GART_2xRESET);
87 pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL,
88 ctrl);
89 }
90 }
91
uninorth_cleanup(void)92 static void uninorth_cleanup(void)
93 {
94 u32 tmp;
95
96 pci_read_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL, &tmp);
97 if (!(tmp & UNI_N_CFG_GART_ENABLE))
98 return;
99 tmp |= UNI_N_CFG_GART_INVAL;
100 pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL, tmp);
101 pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL, 0);
102
103 if (uninorth_rev <= 0x30) {
104 pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL,
105 UNI_N_CFG_GART_2xRESET);
106 pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL,
107 0);
108 }
109 }
110
uninorth_configure(void)111 static int uninorth_configure(void)
112 {
113 struct aper_size_info_32 *current_size;
114
115 current_size = A_SIZE_32(agp_bridge->current_size);
116
117 dev_info(&agp_bridge->dev->dev, "configuring for size idx: %d\n",
118 current_size->size_value);
119
120 /* aperture size and gatt addr */
121 pci_write_config_dword(agp_bridge->dev,
122 UNI_N_CFG_GART_BASE,
123 (agp_bridge->gatt_bus_addr & 0xfffff000)
124 | current_size->size_value);
125
126 /* HACK ALERT
127 * UniNorth seem to be buggy enough not to handle properly when
128 * the AGP aperture isn't mapped at bus physical address 0
129 */
130 agp_bridge->gart_bus_addr = 0;
131 #ifdef CONFIG_PPC64
132 /* Assume U3 or later on PPC64 systems */
133 /* high 4 bits of GART physical address go in UNI_N_CFG_AGP_BASE */
134 pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_AGP_BASE,
135 (agp_bridge->gatt_bus_addr >> 32) & 0xf);
136 #else
137 pci_write_config_dword(agp_bridge->dev,
138 UNI_N_CFG_AGP_BASE, agp_bridge->gart_bus_addr);
139 #endif
140
141 if (is_u3) {
142 pci_write_config_dword(agp_bridge->dev,
143 UNI_N_CFG_GART_DUMMY_PAGE,
144 page_to_phys(agp_bridge->scratch_page_page) >> 12);
145 }
146
147 return 0;
148 }
149
uninorth_insert_memory(struct agp_memory * mem,off_t pg_start,int type)150 static int uninorth_insert_memory(struct agp_memory *mem, off_t pg_start, int type)
151 {
152 int i, num_entries;
153 void *temp;
154 u32 *gp;
155 int mask_type;
156
157 if (type != mem->type)
158 return -EINVAL;
159
160 mask_type = agp_bridge->driver->agp_type_to_mask_type(agp_bridge, type);
161 if (mask_type != 0) {
162 /* We know nothing of memory types */
163 return -EINVAL;
164 }
165
166 if (mem->page_count == 0)
167 return 0;
168
169 temp = agp_bridge->current_size;
170 num_entries = A_SIZE_32(temp)->num_entries;
171
172 if ((pg_start + mem->page_count) > num_entries)
173 return -EINVAL;
174
175 gp = (u32 *) &agp_bridge->gatt_table[pg_start];
176 for (i = 0; i < mem->page_count; ++i) {
177 if (gp[i] != scratch_value) {
178 dev_info(&agp_bridge->dev->dev,
179 "uninorth_insert_memory: entry 0x%x occupied (%x)\n",
180 i, gp[i]);
181 return -EBUSY;
182 }
183 }
184
185 for (i = 0; i < mem->page_count; i++) {
186 if (is_u3)
187 gp[i] = (page_to_phys(mem->pages[i]) >> PAGE_SHIFT) | 0x80000000UL;
188 else
189 gp[i] = cpu_to_le32((page_to_phys(mem->pages[i]) & 0xFFFFF000UL) |
190 0x1UL);
191 flush_dcache_range((unsigned long)__va(page_to_phys(mem->pages[i])),
192 (unsigned long)__va(page_to_phys(mem->pages[i]))+0x1000);
193 }
194 mb();
195 uninorth_tlbflush(mem);
196
197 return 0;
198 }
199
uninorth_remove_memory(struct agp_memory * mem,off_t pg_start,int type)200 static int uninorth_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
201 {
202 size_t i;
203 u32 *gp;
204 int mask_type;
205
206 if (type != mem->type)
207 return -EINVAL;
208
209 mask_type = agp_bridge->driver->agp_type_to_mask_type(agp_bridge, type);
210 if (mask_type != 0) {
211 /* We know nothing of memory types */
212 return -EINVAL;
213 }
214
215 if (mem->page_count == 0)
216 return 0;
217
218 gp = (u32 *) &agp_bridge->gatt_table[pg_start];
219 for (i = 0; i < mem->page_count; ++i) {
220 gp[i] = scratch_value;
221 }
222 mb();
223 uninorth_tlbflush(mem);
224
225 return 0;
226 }
227
uninorth_agp_enable(struct agp_bridge_data * bridge,u32 mode)228 static void uninorth_agp_enable(struct agp_bridge_data *bridge, u32 mode)
229 {
230 u32 command, scratch, status;
231 int timeout;
232
233 pci_read_config_dword(bridge->dev,
234 bridge->capndx + PCI_AGP_STATUS,
235 &status);
236
237 command = agp_collect_device_status(bridge, mode, status);
238 command |= PCI_AGP_COMMAND_AGP;
239
240 if (uninorth_rev == 0x21) {
241 /*
242 * Darwin disable AGP 4x on this revision, thus we
243 * may assume it's broken. This is an AGP2 controller.
244 */
245 command &= ~AGPSTAT2_4X;
246 }
247
248 if ((uninorth_rev >= 0x30) && (uninorth_rev <= 0x33)) {
249 /*
250 * We need to set REQ_DEPTH to 7 for U3 versions 1.0, 2.1,
251 * 2.2 and 2.3, Darwin do so.
252 */
253 if ((command >> AGPSTAT_RQ_DEPTH_SHIFT) > 7)
254 command = (command & ~AGPSTAT_RQ_DEPTH)
255 | (7 << AGPSTAT_RQ_DEPTH_SHIFT);
256 }
257
258 uninorth_tlbflush(NULL);
259
260 timeout = 0;
261 do {
262 pci_write_config_dword(bridge->dev,
263 bridge->capndx + PCI_AGP_COMMAND,
264 command);
265 pci_read_config_dword(bridge->dev,
266 bridge->capndx + PCI_AGP_COMMAND,
267 &scratch);
268 } while ((scratch & PCI_AGP_COMMAND_AGP) == 0 && ++timeout < 1000);
269 if ((scratch & PCI_AGP_COMMAND_AGP) == 0)
270 dev_err(&bridge->dev->dev, "can't write UniNorth AGP "
271 "command register\n");
272
273 if (uninorth_rev >= 0x30) {
274 /* This is an AGP V3 */
275 agp_device_command(command, (status & AGPSTAT_MODE_3_0) != 0);
276 } else {
277 /* AGP V2 */
278 agp_device_command(command, false);
279 }
280
281 uninorth_tlbflush(NULL);
282 }
283
284 #ifdef CONFIG_PM
285 /*
286 * These Power Management routines are _not_ called by the normal PCI PM layer,
287 * but directly by the video driver through function pointers in the device
288 * tree.
289 */
agp_uninorth_suspend(struct pci_dev * pdev)290 static int agp_uninorth_suspend(struct pci_dev *pdev)
291 {
292 struct agp_bridge_data *bridge;
293 u32 cmd;
294 u8 agp;
295 struct pci_dev *device = NULL;
296
297 bridge = agp_find_bridge(pdev);
298 if (bridge == NULL)
299 return -ENODEV;
300
301 /* Only one suspend supported */
302 if (bridge->dev_private_data)
303 return 0;
304
305 /* turn off AGP on the video chip, if it was enabled */
306 for_each_pci_dev(device) {
307 /* Don't touch the bridge yet, device first */
308 if (device == pdev)
309 continue;
310 /* Only deal with devices on the same bus here, no Mac has a P2P
311 * bridge on the AGP port, and mucking around the entire PCI
312 * tree is source of problems on some machines because of a bug
313 * in some versions of pci_find_capability() when hitting a dead
314 * device
315 */
316 if (device->bus != pdev->bus)
317 continue;
318 agp = pci_find_capability(device, PCI_CAP_ID_AGP);
319 if (!agp)
320 continue;
321 pci_read_config_dword(device, agp + PCI_AGP_COMMAND, &cmd);
322 if (!(cmd & PCI_AGP_COMMAND_AGP))
323 continue;
324 dev_info(&pdev->dev, "disabling AGP on device %s\n",
325 pci_name(device));
326 cmd &= ~PCI_AGP_COMMAND_AGP;
327 pci_write_config_dword(device, agp + PCI_AGP_COMMAND, cmd);
328 }
329
330 /* turn off AGP on the bridge */
331 agp = pci_find_capability(pdev, PCI_CAP_ID_AGP);
332 pci_read_config_dword(pdev, agp + PCI_AGP_COMMAND, &cmd);
333 bridge->dev_private_data = (void *)(long)cmd;
334 if (cmd & PCI_AGP_COMMAND_AGP) {
335 dev_info(&pdev->dev, "disabling AGP on bridge\n");
336 cmd &= ~PCI_AGP_COMMAND_AGP;
337 pci_write_config_dword(pdev, agp + PCI_AGP_COMMAND, cmd);
338 }
339 /* turn off the GART */
340 uninorth_cleanup();
341
342 return 0;
343 }
344
agp_uninorth_resume(struct pci_dev * pdev)345 static int agp_uninorth_resume(struct pci_dev *pdev)
346 {
347 struct agp_bridge_data *bridge;
348 u32 command;
349
350 bridge = agp_find_bridge(pdev);
351 if (bridge == NULL)
352 return -ENODEV;
353
354 command = (long)bridge->dev_private_data;
355 bridge->dev_private_data = NULL;
356 if (!(command & PCI_AGP_COMMAND_AGP))
357 return 0;
358
359 uninorth_agp_enable(bridge, command);
360
361 return 0;
362 }
363 #endif /* CONFIG_PM */
364
365 static struct {
366 struct page **pages_arr;
367 } uninorth_priv;
368
uninorth_create_gatt_table(struct agp_bridge_data * bridge)369 static int uninorth_create_gatt_table(struct agp_bridge_data *bridge)
370 {
371 char *table;
372 char *table_end;
373 int size;
374 int page_order;
375 int num_entries;
376 int i;
377 void *temp;
378 struct page *page;
379
380 /* We can't handle 2 level gatt's */
381 if (bridge->driver->size_type == LVL2_APER_SIZE)
382 return -EINVAL;
383
384 table = NULL;
385 i = bridge->aperture_size_idx;
386 temp = bridge->current_size;
387 size = page_order = num_entries = 0;
388
389 do {
390 size = A_SIZE_32(temp)->size;
391 page_order = A_SIZE_32(temp)->page_order;
392 num_entries = A_SIZE_32(temp)->num_entries;
393
394 table = (char *) __get_free_pages(GFP_KERNEL, page_order);
395
396 if (table == NULL) {
397 i++;
398 bridge->current_size = A_IDX32(bridge);
399 } else {
400 bridge->aperture_size_idx = i;
401 }
402 } while (!table && (i < bridge->driver->num_aperture_sizes));
403
404 if (table == NULL)
405 return -ENOMEM;
406
407 uninorth_priv.pages_arr = kmalloc_array(1 << page_order,
408 sizeof(struct page *),
409 GFP_KERNEL);
410 if (uninorth_priv.pages_arr == NULL)
411 goto enomem;
412
413 table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
414
415 for (page = virt_to_page(table), i = 0; page <= virt_to_page(table_end);
416 page++, i++) {
417 SetPageReserved(page);
418 uninorth_priv.pages_arr[i] = page;
419 }
420
421 bridge->gatt_table_real = (u32 *) table;
422 /* Need to clear out any dirty data still sitting in caches */
423 flush_dcache_range((unsigned long)table,
424 (unsigned long)table_end + 1);
425 bridge->gatt_table = vmap(uninorth_priv.pages_arr, (1 << page_order), 0, PAGE_KERNEL_NCG);
426
427 if (bridge->gatt_table == NULL)
428 goto enomem;
429
430 bridge->gatt_bus_addr = virt_to_phys(table);
431
432 if (is_u3)
433 scratch_value = (page_to_phys(agp_bridge->scratch_page_page) >> PAGE_SHIFT) | 0x80000000UL;
434 else
435 scratch_value = cpu_to_le32((page_to_phys(agp_bridge->scratch_page_page) & 0xFFFFF000UL) |
436 0x1UL);
437 for (i = 0; i < num_entries; i++)
438 bridge->gatt_table[i] = scratch_value;
439
440 return 0;
441
442 enomem:
443 kfree(uninorth_priv.pages_arr);
444 if (table)
445 free_pages((unsigned long)table, page_order);
446 return -ENOMEM;
447 }
448
uninorth_free_gatt_table(struct agp_bridge_data * bridge)449 static int uninorth_free_gatt_table(struct agp_bridge_data *bridge)
450 {
451 int page_order;
452 char *table, *table_end;
453 void *temp;
454 struct page *page;
455
456 temp = bridge->current_size;
457 page_order = A_SIZE_32(temp)->page_order;
458
459 /* Do not worry about freeing memory, because if this is
460 * called, then all agp memory is deallocated and removed
461 * from the table.
462 */
463
464 vunmap(bridge->gatt_table);
465 kfree(uninorth_priv.pages_arr);
466 table = (char *) bridge->gatt_table_real;
467 table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
468
469 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
470 ClearPageReserved(page);
471
472 free_pages((unsigned long) bridge->gatt_table_real, page_order);
473
474 return 0;
475 }
476
null_cache_flush(void)477 static void null_cache_flush(void)
478 {
479 mb();
480 }
481
482 /* Setup function */
483
484 static const struct aper_size_info_32 uninorth_sizes[] =
485 {
486 {256, 65536, 6, 64},
487 {128, 32768, 5, 32},
488 {64, 16384, 4, 16},
489 {32, 8192, 3, 8},
490 {16, 4096, 2, 4},
491 {8, 2048, 1, 2},
492 {4, 1024, 0, 1}
493 };
494
495 /*
496 * Not sure that u3 supports that high aperture sizes but it
497 * would strange if it did not :)
498 */
499 static const struct aper_size_info_32 u3_sizes[] =
500 {
501 {512, 131072, 7, 128},
502 {256, 65536, 6, 64},
503 {128, 32768, 5, 32},
504 {64, 16384, 4, 16},
505 {32, 8192, 3, 8},
506 {16, 4096, 2, 4},
507 {8, 2048, 1, 2},
508 {4, 1024, 0, 1}
509 };
510
511 const struct agp_bridge_driver uninorth_agp_driver = {
512 .owner = THIS_MODULE,
513 .aperture_sizes = (void *)uninorth_sizes,
514 .size_type = U32_APER_SIZE,
515 .num_aperture_sizes = ARRAY_SIZE(uninorth_sizes),
516 .configure = uninorth_configure,
517 .fetch_size = uninorth_fetch_size,
518 .cleanup = uninorth_cleanup,
519 .tlb_flush = uninorth_tlbflush,
520 .mask_memory = agp_generic_mask_memory,
521 .masks = NULL,
522 .cache_flush = null_cache_flush,
523 .agp_enable = uninorth_agp_enable,
524 .create_gatt_table = uninorth_create_gatt_table,
525 .free_gatt_table = uninorth_free_gatt_table,
526 .insert_memory = uninorth_insert_memory,
527 .remove_memory = uninorth_remove_memory,
528 .alloc_by_type = agp_generic_alloc_by_type,
529 .free_by_type = agp_generic_free_by_type,
530 .agp_alloc_page = agp_generic_alloc_page,
531 .agp_alloc_pages = agp_generic_alloc_pages,
532 .agp_destroy_page = agp_generic_destroy_page,
533 .agp_destroy_pages = agp_generic_destroy_pages,
534 .agp_type_to_mask_type = agp_generic_type_to_mask_type,
535 .cant_use_aperture = true,
536 .needs_scratch_page = true,
537 };
538
539 const struct agp_bridge_driver u3_agp_driver = {
540 .owner = THIS_MODULE,
541 .aperture_sizes = (void *)u3_sizes,
542 .size_type = U32_APER_SIZE,
543 .num_aperture_sizes = ARRAY_SIZE(u3_sizes),
544 .configure = uninorth_configure,
545 .fetch_size = uninorth_fetch_size,
546 .cleanup = uninorth_cleanup,
547 .tlb_flush = uninorth_tlbflush,
548 .mask_memory = agp_generic_mask_memory,
549 .masks = NULL,
550 .cache_flush = null_cache_flush,
551 .agp_enable = uninorth_agp_enable,
552 .create_gatt_table = uninorth_create_gatt_table,
553 .free_gatt_table = uninorth_free_gatt_table,
554 .insert_memory = uninorth_insert_memory,
555 .remove_memory = uninorth_remove_memory,
556 .alloc_by_type = agp_generic_alloc_by_type,
557 .free_by_type = agp_generic_free_by_type,
558 .agp_alloc_page = agp_generic_alloc_page,
559 .agp_alloc_pages = agp_generic_alloc_pages,
560 .agp_destroy_page = agp_generic_destroy_page,
561 .agp_destroy_pages = agp_generic_destroy_pages,
562 .agp_type_to_mask_type = agp_generic_type_to_mask_type,
563 .cant_use_aperture = true,
564 .needs_scratch_page = true,
565 };
566
567 static struct agp_device_ids uninorth_agp_device_ids[] = {
568 {
569 .device_id = PCI_DEVICE_ID_APPLE_UNI_N_AGP,
570 .chipset_name = "UniNorth",
571 },
572 {
573 .device_id = PCI_DEVICE_ID_APPLE_UNI_N_AGP_P,
574 .chipset_name = "UniNorth/Pangea",
575 },
576 {
577 .device_id = PCI_DEVICE_ID_APPLE_UNI_N_AGP15,
578 .chipset_name = "UniNorth 1.5",
579 },
580 {
581 .device_id = PCI_DEVICE_ID_APPLE_UNI_N_AGP2,
582 .chipset_name = "UniNorth 2",
583 },
584 {
585 .device_id = PCI_DEVICE_ID_APPLE_U3_AGP,
586 .chipset_name = "U3",
587 },
588 {
589 .device_id = PCI_DEVICE_ID_APPLE_U3L_AGP,
590 .chipset_name = "U3L",
591 },
592 {
593 .device_id = PCI_DEVICE_ID_APPLE_U3H_AGP,
594 .chipset_name = "U3H",
595 },
596 {
597 .device_id = PCI_DEVICE_ID_APPLE_IPID2_AGP,
598 .chipset_name = "UniNorth/Intrepid2",
599 },
600 };
601
agp_uninorth_probe(struct pci_dev * pdev,const struct pci_device_id * ent)602 static int agp_uninorth_probe(struct pci_dev *pdev,
603 const struct pci_device_id *ent)
604 {
605 struct agp_device_ids *devs = uninorth_agp_device_ids;
606 struct agp_bridge_data *bridge;
607 struct device_node *uninorth_node;
608 u8 cap_ptr;
609 int j;
610
611 cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP);
612 if (cap_ptr == 0)
613 return -ENODEV;
614
615 /* probe for known chipsets */
616 for (j = 0; devs[j].chipset_name != NULL; ++j) {
617 if (pdev->device == devs[j].device_id) {
618 dev_info(&pdev->dev, "Apple %s chipset\n",
619 devs[j].chipset_name);
620 goto found;
621 }
622 }
623
624 dev_err(&pdev->dev, "unsupported Apple chipset [%04x/%04x]\n",
625 pdev->vendor, pdev->device);
626 return -ENODEV;
627
628 found:
629 /* Set revision to 0 if we could not read it. */
630 uninorth_rev = 0;
631 is_u3 = 0;
632 /* Locate core99 Uni-N */
633 uninorth_node = of_find_node_by_name(NULL, "uni-n");
634 /* Locate G5 u3 */
635 if (uninorth_node == NULL) {
636 is_u3 = 1;
637 uninorth_node = of_find_node_by_name(NULL, "u3");
638 }
639 if (uninorth_node) {
640 const int *revprop = of_get_property(uninorth_node,
641 "device-rev", NULL);
642 if (revprop != NULL)
643 uninorth_rev = *revprop & 0x3f;
644 of_node_put(uninorth_node);
645 }
646
647 #ifdef CONFIG_PM
648 /* Inform platform of our suspend/resume caps */
649 pmac_register_agp_pm(pdev, agp_uninorth_suspend, agp_uninorth_resume);
650 #endif
651
652 /* Allocate & setup our driver */
653 bridge = agp_alloc_bridge();
654 if (!bridge)
655 return -ENOMEM;
656
657 if (is_u3)
658 bridge->driver = &u3_agp_driver;
659 else
660 bridge->driver = &uninorth_agp_driver;
661
662 bridge->dev = pdev;
663 bridge->capndx = cap_ptr;
664 bridge->flags = AGP_ERRATA_FASTWRITES;
665
666 /* Fill in the mode register */
667 pci_read_config_dword(pdev, cap_ptr+PCI_AGP_STATUS, &bridge->mode);
668
669 pci_set_drvdata(pdev, bridge);
670 return agp_add_bridge(bridge);
671 }
672
agp_uninorth_remove(struct pci_dev * pdev)673 static void agp_uninorth_remove(struct pci_dev *pdev)
674 {
675 struct agp_bridge_data *bridge = pci_get_drvdata(pdev);
676
677 #ifdef CONFIG_PM
678 /* Inform platform of our suspend/resume caps */
679 pmac_register_agp_pm(pdev, NULL, NULL);
680 #endif
681
682 agp_remove_bridge(bridge);
683 agp_put_bridge(bridge);
684 }
685
686 static const struct pci_device_id agp_uninorth_pci_table[] = {
687 {
688 .class = (PCI_CLASS_BRIDGE_HOST << 8),
689 .class_mask = ~0,
690 .vendor = PCI_VENDOR_ID_APPLE,
691 .device = PCI_ANY_ID,
692 .subvendor = PCI_ANY_ID,
693 .subdevice = PCI_ANY_ID,
694 },
695 { }
696 };
697
698 MODULE_DEVICE_TABLE(pci, agp_uninorth_pci_table);
699
700 static struct pci_driver agp_uninorth_pci_driver = {
701 .name = "agpgart-uninorth",
702 .id_table = agp_uninorth_pci_table,
703 .probe = agp_uninorth_probe,
704 .remove = agp_uninorth_remove,
705 };
706
agp_uninorth_init(void)707 static int __init agp_uninorth_init(void)
708 {
709 if (agp_off)
710 return -EINVAL;
711 return pci_register_driver(&agp_uninorth_pci_driver);
712 }
713
agp_uninorth_cleanup(void)714 static void __exit agp_uninorth_cleanup(void)
715 {
716 pci_unregister_driver(&agp_uninorth_pci_driver);
717 }
718
719 module_init(agp_uninorth_init);
720 module_exit(agp_uninorth_cleanup);
721
722 module_param(aperture, charp, 0);
723 MODULE_PARM_DESC(aperture,
724 "Aperture size, must be power of two between 4MB and an\n"
725 "\t\tupper limit specific to the UniNorth revision.\n"
726 "\t\tDefault: " DEFAULT_APERTURE_STRING "M");
727
728 MODULE_AUTHOR("Ben Herrenschmidt & Paul Mackerras");
729 MODULE_DESCRIPTION("Apple UniNorth & U3 AGP support");
730 MODULE_LICENSE("GPL");
731