1 /*
2 * For documentation on the i460 AGP interface, see Chapter 7 (AGP Subsystem) of
3 * the "Intel 460GTX Chipset Software Developer's Manual":
4 * http://www.intel.com/design/archives/itanium/downloads/248704.htm
5 */
6 /*
7 * 460GX support by Chris Ahna <christopher.j.ahna@intel.com>
8 * Clean up & simplification by David Mosberger-Tang <davidm@hpl.hp.com>
9 */
10 #include <linux/module.h>
11 #include <linux/pci.h>
12 #include <linux/init.h>
13 #include <linux/string.h>
14 #include <linux/slab.h>
15 #include <linux/agp_backend.h>
16 #include <linux/log2.h>
17
18 #include "agp.h"
19
20 #define INTEL_I460_BAPBASE 0x98
21 #define INTEL_I460_GXBCTL 0xa0
22 #define INTEL_I460_AGPSIZ 0xa2
23 #define INTEL_I460_ATTBASE 0xfe200000
24 #define INTEL_I460_GATT_VALID (1UL << 24)
25 #define INTEL_I460_GATT_COHERENT (1UL << 25)
26
27 /*
28 * The i460 can operate with large (4MB) pages, but there is no sane way to support this
29 * within the current kernel/DRM environment, so we disable the relevant code for now.
30 * See also comments in ia64_alloc_page()...
31 */
32 #define I460_LARGE_IO_PAGES 0
33
34 #if I460_LARGE_IO_PAGES
35 # define I460_IO_PAGE_SHIFT i460.io_page_shift
36 #else
37 # define I460_IO_PAGE_SHIFT 12
38 #endif
39
40 #define I460_IOPAGES_PER_KPAGE (PAGE_SIZE >> I460_IO_PAGE_SHIFT)
41 #define I460_KPAGES_PER_IOPAGE (1 << (I460_IO_PAGE_SHIFT - PAGE_SHIFT))
42 #define I460_SRAM_IO_DISABLE (1 << 4)
43 #define I460_BAPBASE_ENABLE (1 << 3)
44 #define I460_AGPSIZ_MASK 0x7
45 #define I460_4M_PS (1 << 1)
46
47 /* Control bits for Out-Of-GART coherency and Burst Write Combining */
48 #define I460_GXBCTL_OOG (1UL << 0)
49 #define I460_GXBCTL_BWC (1UL << 2)
50
51 /*
52 * gatt_table entries are 32-bits wide on the i460; the generic code ought to declare the
53 * gatt_table and gatt_table_real pointers a "void *"...
54 */
55 #define RD_GATT(index) readl((u32 *) i460.gatt + (index))
56 #define WR_GATT(index, val) writel((val), (u32 *) i460.gatt + (index))
57 /*
58 * The 460 spec says we have to read the last location written to make sure that all
59 * writes have taken effect
60 */
61 #define WR_FLUSH_GATT(index) RD_GATT(index)
62
63 static unsigned long i460_mask_memory (struct agp_bridge_data *bridge,
64 dma_addr_t addr, int type);
65
66 static struct {
67 void *gatt; /* ioremap'd GATT area */
68
69 /* i460 supports multiple GART page sizes, so GART pageshift is dynamic: */
70 u8 io_page_shift;
71
72 /* BIOS configures chipset to one of 2 possible apbase values: */
73 u8 dynamic_apbase;
74
75 /* structure for tracking partial use of 4MB GART pages: */
76 struct lp_desc {
77 unsigned long *alloced_map; /* bitmap of kernel-pages in use */
78 int refcount; /* number of kernel pages using the large page */
79 u64 paddr; /* physical address of large page */
80 struct page *page; /* page pointer */
81 } *lp_desc;
82 } i460;
83
84 static const struct aper_size_info_8 i460_sizes[3] =
85 {
86 /*
87 * The 32GB aperture is only available with a 4M GART page size. Due to the
88 * dynamic GART page size, we can't figure out page_order or num_entries until
89 * runtime.
90 */
91 {32768, 0, 0, 4},
92 {1024, 0, 0, 2},
93 {256, 0, 0, 1}
94 };
95
96 static struct gatt_mask i460_masks[] =
97 {
98 {
99 .mask = INTEL_I460_GATT_VALID | INTEL_I460_GATT_COHERENT,
100 .type = 0
101 }
102 };
103
i460_fetch_size(void)104 static int i460_fetch_size (void)
105 {
106 int i;
107 u8 temp;
108 struct aper_size_info_8 *values;
109
110 /* Determine the GART page size */
111 pci_read_config_byte(agp_bridge->dev, INTEL_I460_GXBCTL, &temp);
112 i460.io_page_shift = (temp & I460_4M_PS) ? 22 : 12;
113 pr_debug("i460_fetch_size: io_page_shift=%d\n", i460.io_page_shift);
114
115 if (i460.io_page_shift != I460_IO_PAGE_SHIFT) {
116 printk(KERN_ERR PFX
117 "I/O (GART) page-size %luKB doesn't match expected "
118 "size %luKB\n",
119 1UL << (i460.io_page_shift - 10),
120 1UL << (I460_IO_PAGE_SHIFT));
121 return 0;
122 }
123
124 values = A_SIZE_8(agp_bridge->driver->aperture_sizes);
125
126 pci_read_config_byte(agp_bridge->dev, INTEL_I460_AGPSIZ, &temp);
127
128 /* Exit now if the IO drivers for the GART SRAMS are turned off */
129 if (temp & I460_SRAM_IO_DISABLE) {
130 printk(KERN_ERR PFX "GART SRAMS disabled on 460GX chipset\n");
131 printk(KERN_ERR PFX "AGPGART operation not possible\n");
132 return 0;
133 }
134
135 /* Make sure we don't try to create an 2 ^ 23 entry GATT */
136 if ((i460.io_page_shift == 0) && ((temp & I460_AGPSIZ_MASK) == 4)) {
137 printk(KERN_ERR PFX "We can't have a 32GB aperture with 4KB GART pages\n");
138 return 0;
139 }
140
141 /* Determine the proper APBASE register */
142 if (temp & I460_BAPBASE_ENABLE)
143 i460.dynamic_apbase = INTEL_I460_BAPBASE;
144 else
145 i460.dynamic_apbase = AGP_APBASE;
146
147 for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
148 /*
149 * Dynamically calculate the proper num_entries and page_order values for
150 * the define aperture sizes. Take care not to shift off the end of
151 * values[i].size.
152 */
153 values[i].num_entries = (values[i].size << 8) >> (I460_IO_PAGE_SHIFT - 12);
154 values[i].page_order = ilog2((sizeof(u32)*values[i].num_entries) >> PAGE_SHIFT);
155 }
156
157 for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
158 /* Neglect control bits when matching up size_value */
159 if ((temp & I460_AGPSIZ_MASK) == values[i].size_value) {
160 agp_bridge->previous_size = agp_bridge->current_size = (void *) (values + i);
161 agp_bridge->aperture_size_idx = i;
162 return values[i].size;
163 }
164 }
165
166 return 0;
167 }
168
169 /* There isn't anything to do here since 460 has no GART TLB. */
i460_tlb_flush(struct agp_memory * mem)170 static void i460_tlb_flush (struct agp_memory *mem)
171 {
172 return;
173 }
174
175 /*
176 * This utility function is needed to prevent corruption of the control bits
177 * which are stored along with the aperture size in 460's AGPSIZ register
178 */
i460_write_agpsiz(u8 size_value)179 static void i460_write_agpsiz (u8 size_value)
180 {
181 u8 temp;
182
183 pci_read_config_byte(agp_bridge->dev, INTEL_I460_AGPSIZ, &temp);
184 pci_write_config_byte(agp_bridge->dev, INTEL_I460_AGPSIZ,
185 ((temp & ~I460_AGPSIZ_MASK) | size_value));
186 }
187
i460_cleanup(void)188 static void i460_cleanup (void)
189 {
190 struct aper_size_info_8 *previous_size;
191
192 previous_size = A_SIZE_8(agp_bridge->previous_size);
193 i460_write_agpsiz(previous_size->size_value);
194
195 if (I460_IO_PAGE_SHIFT > PAGE_SHIFT)
196 kfree(i460.lp_desc);
197 }
198
i460_configure(void)199 static int i460_configure (void)
200 {
201 union {
202 u32 small[2];
203 u64 large;
204 } temp;
205 size_t size;
206 u8 scratch;
207 struct aper_size_info_8 *current_size;
208
209 temp.large = 0;
210
211 current_size = A_SIZE_8(agp_bridge->current_size);
212 i460_write_agpsiz(current_size->size_value);
213
214 /*
215 * Do the necessary rigmarole to read all eight bytes of APBASE.
216 * This has to be done since the AGP aperture can be above 4GB on
217 * 460 based systems.
218 */
219 pci_read_config_dword(agp_bridge->dev, i460.dynamic_apbase, &(temp.small[0]));
220 pci_read_config_dword(agp_bridge->dev, i460.dynamic_apbase + 4, &(temp.small[1]));
221
222 /* Clear BAR control bits */
223 agp_bridge->gart_bus_addr = temp.large & ~((1UL << 3) - 1);
224
225 pci_read_config_byte(agp_bridge->dev, INTEL_I460_GXBCTL, &scratch);
226 pci_write_config_byte(agp_bridge->dev, INTEL_I460_GXBCTL,
227 (scratch & 0x02) | I460_GXBCTL_OOG | I460_GXBCTL_BWC);
228
229 /*
230 * Initialize partial allocation trackers if a GART page is bigger than a kernel
231 * page.
232 */
233 if (I460_IO_PAGE_SHIFT > PAGE_SHIFT) {
234 size = current_size->num_entries * sizeof(i460.lp_desc[0]);
235 i460.lp_desc = kzalloc(size, GFP_KERNEL);
236 if (!i460.lp_desc)
237 return -ENOMEM;
238 }
239 return 0;
240 }
241
i460_create_gatt_table(struct agp_bridge_data * bridge)242 static int i460_create_gatt_table (struct agp_bridge_data *bridge)
243 {
244 int page_order, num_entries, i;
245 void *temp;
246
247 /*
248 * Load up the fixed address of the GART SRAMS which hold our GATT table.
249 */
250 temp = agp_bridge->current_size;
251 page_order = A_SIZE_8(temp)->page_order;
252 num_entries = A_SIZE_8(temp)->num_entries;
253
254 i460.gatt = ioremap(INTEL_I460_ATTBASE, PAGE_SIZE << page_order);
255 if (!i460.gatt) {
256 printk(KERN_ERR PFX "ioremap failed\n");
257 return -ENOMEM;
258 }
259
260 /* These are no good, the should be removed from the agp_bridge strucure... */
261 agp_bridge->gatt_table_real = NULL;
262 agp_bridge->gatt_table = NULL;
263 agp_bridge->gatt_bus_addr = 0;
264
265 for (i = 0; i < num_entries; ++i)
266 WR_GATT(i, 0);
267 WR_FLUSH_GATT(i - 1);
268 return 0;
269 }
270
i460_free_gatt_table(struct agp_bridge_data * bridge)271 static int i460_free_gatt_table (struct agp_bridge_data *bridge)
272 {
273 int num_entries, i;
274 void *temp;
275
276 temp = agp_bridge->current_size;
277
278 num_entries = A_SIZE_8(temp)->num_entries;
279
280 for (i = 0; i < num_entries; ++i)
281 WR_GATT(i, 0);
282 WR_FLUSH_GATT(num_entries - 1);
283
284 iounmap(i460.gatt);
285 return 0;
286 }
287
288 /*
289 * The following functions are called when the I/O (GART) page size is smaller than
290 * PAGE_SIZE.
291 */
292
i460_insert_memory_small_io_page(struct agp_memory * mem,off_t pg_start,int type)293 static int i460_insert_memory_small_io_page (struct agp_memory *mem,
294 off_t pg_start, int type)
295 {
296 unsigned long paddr, io_pg_start, io_page_size;
297 int i, j, k, num_entries;
298 void *temp;
299
300 pr_debug("i460_insert_memory_small_io_page(mem=%p, pg_start=%ld, type=%d, paddr0=0x%lx)\n",
301 mem, pg_start, type, page_to_phys(mem->pages[0]));
302
303 if (type >= AGP_USER_TYPES || mem->type >= AGP_USER_TYPES)
304 return -EINVAL;
305
306 io_pg_start = I460_IOPAGES_PER_KPAGE * pg_start;
307
308 temp = agp_bridge->current_size;
309 num_entries = A_SIZE_8(temp)->num_entries;
310
311 if ((io_pg_start + I460_IOPAGES_PER_KPAGE * mem->page_count) > num_entries) {
312 printk(KERN_ERR PFX "Looks like we're out of AGP memory\n");
313 return -EINVAL;
314 }
315
316 j = io_pg_start;
317 while (j < (io_pg_start + I460_IOPAGES_PER_KPAGE * mem->page_count)) {
318 if (!PGE_EMPTY(agp_bridge, RD_GATT(j))) {
319 pr_debug("i460_insert_memory_small_io_page: GATT[%d]=0x%x is busy\n",
320 j, RD_GATT(j));
321 return -EBUSY;
322 }
323 j++;
324 }
325
326 io_page_size = 1UL << I460_IO_PAGE_SHIFT;
327 for (i = 0, j = io_pg_start; i < mem->page_count; i++) {
328 paddr = page_to_phys(mem->pages[i]);
329 for (k = 0; k < I460_IOPAGES_PER_KPAGE; k++, j++, paddr += io_page_size)
330 WR_GATT(j, i460_mask_memory(agp_bridge, paddr, mem->type));
331 }
332 WR_FLUSH_GATT(j - 1);
333 return 0;
334 }
335
i460_remove_memory_small_io_page(struct agp_memory * mem,off_t pg_start,int type)336 static int i460_remove_memory_small_io_page(struct agp_memory *mem,
337 off_t pg_start, int type)
338 {
339 int i;
340
341 pr_debug("i460_remove_memory_small_io_page(mem=%p, pg_start=%ld, type=%d)\n",
342 mem, pg_start, type);
343
344 pg_start = I460_IOPAGES_PER_KPAGE * pg_start;
345
346 for (i = pg_start; i < (pg_start + I460_IOPAGES_PER_KPAGE * mem->page_count); i++)
347 WR_GATT(i, 0);
348 WR_FLUSH_GATT(i - 1);
349 return 0;
350 }
351
352 #if I460_LARGE_IO_PAGES
353
354 /*
355 * These functions are called when the I/O (GART) page size exceeds PAGE_SIZE.
356 *
357 * This situation is interesting since AGP memory allocations that are smaller than a
358 * single GART page are possible. The i460.lp_desc array tracks partial allocation of the
359 * large GART pages to work around this issue.
360 *
361 * i460.lp_desc[pg_num].refcount tracks the number of kernel pages in use within GART page
362 * pg_num. i460.lp_desc[pg_num].paddr is the physical address of the large page and
363 * i460.lp_desc[pg_num].alloced_map is a bitmap of kernel pages that are in use (allocated).
364 */
365
i460_alloc_large_page(struct lp_desc * lp)366 static int i460_alloc_large_page (struct lp_desc *lp)
367 {
368 unsigned long order = I460_IO_PAGE_SHIFT - PAGE_SHIFT;
369 size_t map_size;
370
371 lp->page = alloc_pages(GFP_KERNEL, order);
372 if (!lp->page) {
373 printk(KERN_ERR PFX "Couldn't alloc 4M GART page...\n");
374 return -ENOMEM;
375 }
376
377 map_size = ((I460_KPAGES_PER_IOPAGE + BITS_PER_LONG - 1) & -BITS_PER_LONG)/8;
378 lp->alloced_map = kzalloc(map_size, GFP_KERNEL);
379 if (!lp->alloced_map) {
380 __free_pages(lp->page, order);
381 printk(KERN_ERR PFX "Out of memory, we're in trouble...\n");
382 return -ENOMEM;
383 }
384
385 lp->paddr = page_to_phys(lp->page);
386 lp->refcount = 0;
387 atomic_add(I460_KPAGES_PER_IOPAGE, &agp_bridge->current_memory_agp);
388 return 0;
389 }
390
i460_free_large_page(struct lp_desc * lp)391 static void i460_free_large_page (struct lp_desc *lp)
392 {
393 kfree(lp->alloced_map);
394 lp->alloced_map = NULL;
395
396 __free_pages(lp->page, I460_IO_PAGE_SHIFT - PAGE_SHIFT);
397 atomic_sub(I460_KPAGES_PER_IOPAGE, &agp_bridge->current_memory_agp);
398 }
399
i460_insert_memory_large_io_page(struct agp_memory * mem,off_t pg_start,int type)400 static int i460_insert_memory_large_io_page (struct agp_memory *mem,
401 off_t pg_start, int type)
402 {
403 int i, start_offset, end_offset, idx, pg, num_entries;
404 struct lp_desc *start, *end, *lp;
405 void *temp;
406
407 if (type >= AGP_USER_TYPES || mem->type >= AGP_USER_TYPES)
408 return -EINVAL;
409
410 temp = agp_bridge->current_size;
411 num_entries = A_SIZE_8(temp)->num_entries;
412
413 /* Figure out what pg_start means in terms of our large GART pages */
414 start = &i460.lp_desc[pg_start / I460_KPAGES_PER_IOPAGE];
415 end = &i460.lp_desc[(pg_start + mem->page_count - 1) / I460_KPAGES_PER_IOPAGE];
416 start_offset = pg_start % I460_KPAGES_PER_IOPAGE;
417 end_offset = (pg_start + mem->page_count - 1) % I460_KPAGES_PER_IOPAGE;
418
419 if (end > i460.lp_desc + num_entries) {
420 printk(KERN_ERR PFX "Looks like we're out of AGP memory\n");
421 return -EINVAL;
422 }
423
424 /* Check if the requested region of the aperture is free */
425 for (lp = start; lp <= end; ++lp) {
426 if (!lp->alloced_map)
427 continue; /* OK, the entire large page is available... */
428
429 for (idx = ((lp == start) ? start_offset : 0);
430 idx < ((lp == end) ? (end_offset + 1) : I460_KPAGES_PER_IOPAGE);
431 idx++)
432 {
433 if (test_bit(idx, lp->alloced_map))
434 return -EBUSY;
435 }
436 }
437
438 for (lp = start, i = 0; lp <= end; ++lp) {
439 if (!lp->alloced_map) {
440 /* Allocate new GART pages... */
441 if (i460_alloc_large_page(lp) < 0)
442 return -ENOMEM;
443 pg = lp - i460.lp_desc;
444 WR_GATT(pg, i460_mask_memory(agp_bridge,
445 lp->paddr, 0));
446 WR_FLUSH_GATT(pg);
447 }
448
449 for (idx = ((lp == start) ? start_offset : 0);
450 idx < ((lp == end) ? (end_offset + 1) : I460_KPAGES_PER_IOPAGE);
451 idx++, i++)
452 {
453 mem->pages[i] = lp->page;
454 __set_bit(idx, lp->alloced_map);
455 ++lp->refcount;
456 }
457 }
458 return 0;
459 }
460
i460_remove_memory_large_io_page(struct agp_memory * mem,off_t pg_start,int type)461 static int i460_remove_memory_large_io_page (struct agp_memory *mem,
462 off_t pg_start, int type)
463 {
464 int i, pg, start_offset, end_offset, idx, num_entries;
465 struct lp_desc *start, *end, *lp;
466 void *temp;
467
468 temp = agp_bridge->current_size;
469 num_entries = A_SIZE_8(temp)->num_entries;
470
471 /* Figure out what pg_start means in terms of our large GART pages */
472 start = &i460.lp_desc[pg_start / I460_KPAGES_PER_IOPAGE];
473 end = &i460.lp_desc[(pg_start + mem->page_count - 1) / I460_KPAGES_PER_IOPAGE];
474 start_offset = pg_start % I460_KPAGES_PER_IOPAGE;
475 end_offset = (pg_start + mem->page_count - 1) % I460_KPAGES_PER_IOPAGE;
476
477 for (i = 0, lp = start; lp <= end; ++lp) {
478 for (idx = ((lp == start) ? start_offset : 0);
479 idx < ((lp == end) ? (end_offset + 1) : I460_KPAGES_PER_IOPAGE);
480 idx++, i++)
481 {
482 mem->pages[i] = NULL;
483 __clear_bit(idx, lp->alloced_map);
484 --lp->refcount;
485 }
486
487 /* Free GART pages if they are unused */
488 if (lp->refcount == 0) {
489 pg = lp - i460.lp_desc;
490 WR_GATT(pg, 0);
491 WR_FLUSH_GATT(pg);
492 i460_free_large_page(lp);
493 }
494 }
495 return 0;
496 }
497
498 /* Wrapper routines to call the approriate {small_io_page,large_io_page} function */
499
i460_insert_memory(struct agp_memory * mem,off_t pg_start,int type)500 static int i460_insert_memory (struct agp_memory *mem,
501 off_t pg_start, int type)
502 {
503 if (I460_IO_PAGE_SHIFT <= PAGE_SHIFT)
504 return i460_insert_memory_small_io_page(mem, pg_start, type);
505 else
506 return i460_insert_memory_large_io_page(mem, pg_start, type);
507 }
508
i460_remove_memory(struct agp_memory * mem,off_t pg_start,int type)509 static int i460_remove_memory (struct agp_memory *mem,
510 off_t pg_start, int type)
511 {
512 if (I460_IO_PAGE_SHIFT <= PAGE_SHIFT)
513 return i460_remove_memory_small_io_page(mem, pg_start, type);
514 else
515 return i460_remove_memory_large_io_page(mem, pg_start, type);
516 }
517
518 /*
519 * If the I/O (GART) page size is bigger than the kernel page size, we don't want to
520 * allocate memory until we know where it is to be bound in the aperture (a
521 * multi-kernel-page alloc might fit inside of an already allocated GART page).
522 *
523 * Let's just hope nobody counts on the allocated AGP memory being there before bind time
524 * (I don't think current drivers do)...
525 */
i460_alloc_page(struct agp_bridge_data * bridge)526 static struct page *i460_alloc_page (struct agp_bridge_data *bridge)
527 {
528 void *page;
529
530 if (I460_IO_PAGE_SHIFT <= PAGE_SHIFT) {
531 page = agp_generic_alloc_page(agp_bridge);
532 } else
533 /* Returning NULL would cause problems */
534 /* AK: really dubious code. */
535 page = (void *)~0UL;
536 return page;
537 }
538
i460_destroy_page(struct page * page,int flags)539 static void i460_destroy_page (struct page *page, int flags)
540 {
541 if (I460_IO_PAGE_SHIFT <= PAGE_SHIFT) {
542 agp_generic_destroy_page(page, flags);
543 }
544 }
545
546 #endif /* I460_LARGE_IO_PAGES */
547
i460_mask_memory(struct agp_bridge_data * bridge,dma_addr_t addr,int type)548 static unsigned long i460_mask_memory (struct agp_bridge_data *bridge,
549 dma_addr_t addr, int type)
550 {
551 /* Make sure the returned address is a valid GATT entry */
552 return bridge->driver->masks[0].mask
553 | (((addr & ~((1 << I460_IO_PAGE_SHIFT) - 1)) & 0xfffff000) >> 12);
554 }
555
556 const struct agp_bridge_driver intel_i460_driver = {
557 .owner = THIS_MODULE,
558 .aperture_sizes = i460_sizes,
559 .size_type = U8_APER_SIZE,
560 .num_aperture_sizes = 3,
561 .configure = i460_configure,
562 .fetch_size = i460_fetch_size,
563 .cleanup = i460_cleanup,
564 .tlb_flush = i460_tlb_flush,
565 .mask_memory = i460_mask_memory,
566 .masks = i460_masks,
567 .agp_enable = agp_generic_enable,
568 .cache_flush = global_cache_flush,
569 .create_gatt_table = i460_create_gatt_table,
570 .free_gatt_table = i460_free_gatt_table,
571 #if I460_LARGE_IO_PAGES
572 .insert_memory = i460_insert_memory,
573 .remove_memory = i460_remove_memory,
574 .agp_alloc_page = i460_alloc_page,
575 .agp_destroy_page = i460_destroy_page,
576 #else
577 .insert_memory = i460_insert_memory_small_io_page,
578 .remove_memory = i460_remove_memory_small_io_page,
579 .agp_alloc_page = agp_generic_alloc_page,
580 .agp_alloc_pages = agp_generic_alloc_pages,
581 .agp_destroy_page = agp_generic_destroy_page,
582 .agp_destroy_pages = agp_generic_destroy_pages,
583 #endif
584 .alloc_by_type = agp_generic_alloc_by_type,
585 .free_by_type = agp_generic_free_by_type,
586 .agp_type_to_mask_type = agp_generic_type_to_mask_type,
587 .cant_use_aperture = true,
588 };
589
agp_intel_i460_probe(struct pci_dev * pdev,const struct pci_device_id * ent)590 static int agp_intel_i460_probe(struct pci_dev *pdev,
591 const struct pci_device_id *ent)
592 {
593 struct agp_bridge_data *bridge;
594 u8 cap_ptr;
595
596 cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP);
597 if (!cap_ptr)
598 return -ENODEV;
599
600 bridge = agp_alloc_bridge();
601 if (!bridge)
602 return -ENOMEM;
603
604 bridge->driver = &intel_i460_driver;
605 bridge->dev = pdev;
606 bridge->capndx = cap_ptr;
607
608 printk(KERN_INFO PFX "Detected Intel 460GX chipset\n");
609
610 pci_set_drvdata(pdev, bridge);
611 return agp_add_bridge(bridge);
612 }
613
agp_intel_i460_remove(struct pci_dev * pdev)614 static void agp_intel_i460_remove(struct pci_dev *pdev)
615 {
616 struct agp_bridge_data *bridge = pci_get_drvdata(pdev);
617
618 agp_remove_bridge(bridge);
619 agp_put_bridge(bridge);
620 }
621
622 static struct pci_device_id agp_intel_i460_pci_table[] = {
623 {
624 .class = (PCI_CLASS_BRIDGE_HOST << 8),
625 .class_mask = ~0,
626 .vendor = PCI_VENDOR_ID_INTEL,
627 .device = PCI_DEVICE_ID_INTEL_84460GX,
628 .subvendor = PCI_ANY_ID,
629 .subdevice = PCI_ANY_ID,
630 },
631 { }
632 };
633
634 MODULE_DEVICE_TABLE(pci, agp_intel_i460_pci_table);
635
636 static struct pci_driver agp_intel_i460_pci_driver = {
637 .name = "agpgart-intel-i460",
638 .id_table = agp_intel_i460_pci_table,
639 .probe = agp_intel_i460_probe,
640 .remove = agp_intel_i460_remove,
641 };
642
agp_intel_i460_init(void)643 static int __init agp_intel_i460_init(void)
644 {
645 if (agp_off)
646 return -EINVAL;
647 return pci_register_driver(&agp_intel_i460_pci_driver);
648 }
649
agp_intel_i460_cleanup(void)650 static void __exit agp_intel_i460_cleanup(void)
651 {
652 pci_unregister_driver(&agp_intel_i460_pci_driver);
653 }
654
655 module_init(agp_intel_i460_init);
656 module_exit(agp_intel_i460_cleanup);
657
658 MODULE_AUTHOR("Chris Ahna <Christopher.J.Ahna@intel.com>");
659 MODULE_LICENSE("GPL and additional rights");
660