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Linux-2.6.12-rc2
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / char / agp / amd-k7-agp.c
blobf1ea87ea6b65b71edfea0af39ed4fcc139c33973
1 /*
2 * AMD K7 AGPGART routines.
3 */
4
5 #include <linux/module.h>
6 #include <linux/pci.h>
7 #include <linux/init.h>
8 #include <linux/agp_backend.h>
9 #include <linux/gfp.h>
10 #include <linux/page-flags.h>
11 #include <linux/mm.h>
12 #include "agp.h"
13
14 #define AMD_MMBASE 0x14
15 #define AMD_APSIZE 0xac
16 #define AMD_MODECNTL 0xb0
17 #define AMD_MODECNTL2 0xb2
18 #define AMD_GARTENABLE 0x02 /* In mmio region (16-bit register) */
19 #define AMD_ATTBASE 0x04 /* In mmio region (32-bit register) */
20 #define AMD_TLBFLUSH 0x0c /* In mmio region (32-bit register) */
21 #define AMD_CACHEENTRY 0x10 /* In mmio region (32-bit register) */
22
23 static struct pci_device_id agp_amdk7_pci_table[];
24
25 struct amd_page_map {
26 unsigned long *real;
27 unsigned long __iomem *remapped;
28 };
29
30 static struct _amd_irongate_private {
31 volatile u8 __iomem *registers;
32 struct amd_page_map **gatt_pages;
33 int num_tables;
34 } amd_irongate_private;
35
36 static int amd_create_page_map(struct amd_page_map *page_map)
37 {
38 int i;
39
40 page_map->real = (unsigned long *) __get_free_page(GFP_KERNEL);
41 if (page_map->real == NULL)
42 return -ENOMEM;
43
44 SetPageReserved(virt_to_page(page_map->real));
45 global_cache_flush();
46 page_map->remapped = ioremap_nocache(virt_to_phys(page_map->real),
47 PAGE_SIZE);
48 if (page_map->remapped == NULL) {
49 ClearPageReserved(virt_to_page(page_map->real));
50 free_page((unsigned long) page_map->real);
51 page_map->real = NULL;
52 return -ENOMEM;
53 }
54 global_cache_flush();
55
56 for (i = 0; i < PAGE_SIZE / sizeof(unsigned long); i++) {
57 writel(agp_bridge->scratch_page, page_map->remapped+i);
58 readl(page_map->remapped+i); /* PCI Posting. */
59 }
60
61 return 0;
62 }
63
64 static void amd_free_page_map(struct amd_page_map *page_map)
65 {
66 iounmap(page_map->remapped);
67 ClearPageReserved(virt_to_page(page_map->real));
68 free_page((unsigned long) page_map->real);
69 }
70
71 static void amd_free_gatt_pages(void)
72 {
73 int i;
74 struct amd_page_map **tables;
75 struct amd_page_map *entry;
76
77 tables = amd_irongate_private.gatt_pages;
78 for (i = 0; i < amd_irongate_private.num_tables; i++) {
79 entry = tables[i];
80 if (entry != NULL) {
81 if (entry->real != NULL)
82 amd_free_page_map(entry);
83 kfree(entry);
84 }
85 }
86 kfree(tables);
87 amd_irongate_private.gatt_pages = NULL;
88 }
89
90 static int amd_create_gatt_pages(int nr_tables)
91 {
92 struct amd_page_map **tables;
93 struct amd_page_map *entry;
94 int retval = 0;
95 int i;
96
97 tables = kmalloc((nr_tables + 1) * sizeof(struct amd_page_map *),
98 GFP_KERNEL);
99 if (tables == NULL)
100 return -ENOMEM;
101
102 memset (tables, 0, sizeof(struct amd_page_map *) * (nr_tables + 1));
103 for (i = 0; i < nr_tables; i++) {
104 entry = kmalloc(sizeof(struct amd_page_map), GFP_KERNEL);
105 if (entry == NULL) {
106 retval = -ENOMEM;
107 break;
108 }
109 memset (entry, 0, sizeof(struct amd_page_map));
110 tables[i] = entry;
111 retval = amd_create_page_map(entry);
112 if (retval != 0)
113 break;
114 }
115 amd_irongate_private.num_tables = nr_tables;
116 amd_irongate_private.gatt_pages = tables;
117
118 if (retval != 0)
119 amd_free_gatt_pages();
120
121 return retval;
122 }
123
124 /* Since we don't need contigious memory we just try
125 * to get the gatt table once
126 */
127
128 #define GET_PAGE_DIR_OFF(addr) (addr >> 22)
129 #define GET_PAGE_DIR_IDX(addr) (GET_PAGE_DIR_OFF(addr) - \
130 GET_PAGE_DIR_OFF(agp_bridge->gart_bus_addr))
131 #define GET_GATT_OFF(addr) ((addr & 0x003ff000) >> 12)
132 #define GET_GATT(addr) (amd_irongate_private.gatt_pages[\
133 GET_PAGE_DIR_IDX(addr)]->remapped)
134
135 static int amd_create_gatt_table(struct agp_bridge_data *bridge)
136 {
137 struct aper_size_info_lvl2 *value;
138 struct amd_page_map page_dir;
139 unsigned long addr;
140 int retval;
141 u32 temp;
142 int i;
143
144 value = A_SIZE_LVL2(agp_bridge->current_size);
145 retval = amd_create_page_map(&page_dir);
146 if (retval != 0)
147 return retval;
148
149 retval = amd_create_gatt_pages(value->num_entries / 1024);
150 if (retval != 0) {
151 amd_free_page_map(&page_dir);
152 return retval;
153 }
154
155 agp_bridge->gatt_table_real = (u32 *)page_dir.real;
156 agp_bridge->gatt_table = (u32 __iomem *)page_dir.remapped;
157 agp_bridge->gatt_bus_addr = virt_to_phys(page_dir.real);
158
159 /* Get the address for the gart region.
160 * This is a bus address even on the alpha, b/c its
161 * used to program the agp master not the cpu
162 */
163
164 pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &temp);
165 addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
166 agp_bridge->gart_bus_addr = addr;
167
168 /* Calculate the agp offset */
169 for (i = 0; i < value->num_entries / 1024; i++, addr += 0x00400000) {
170 writel(virt_to_phys(amd_irongate_private.gatt_pages[i]->real) | 1,
171 page_dir.remapped+GET_PAGE_DIR_OFF(addr));
172 readl(page_dir.remapped+GET_PAGE_DIR_OFF(addr)); /* PCI Posting. */
173 }
174
175 return 0;
176 }
177
178 static int amd_free_gatt_table(struct agp_bridge_data *bridge)
179 {
180 struct amd_page_map page_dir;
181
182 page_dir.real = (unsigned long *)agp_bridge->gatt_table_real;
183 page_dir.remapped = (unsigned long __iomem *)agp_bridge->gatt_table;
184
185 amd_free_gatt_pages();
186 amd_free_page_map(&page_dir);
187 return 0;
188 }
189
190 static int amd_irongate_fetch_size(void)
191 {
192 int i;
193 u32 temp;
194 struct aper_size_info_lvl2 *values;
195
196 pci_read_config_dword(agp_bridge->dev, AMD_APSIZE, &temp);
197 temp = (temp & 0x0000000e);
198 values = A_SIZE_LVL2(agp_bridge->driver->aperture_sizes);
199 for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
200 if (temp == values[i].size_value) {
201 agp_bridge->previous_size =
202 agp_bridge->current_size = (void *) (values + i);
203
204 agp_bridge->aperture_size_idx = i;
205 return values[i].size;
206 }
207 }
208
209 return 0;
210 }
211
212 static int amd_irongate_configure(void)
213 {
214 struct aper_size_info_lvl2 *current_size;
215 u32 temp;
216 u16 enable_reg;
217
218 current_size = A_SIZE_LVL2(agp_bridge->current_size);
219
220 /* Get the memory mapped registers */
221 pci_read_config_dword(agp_bridge->dev, AMD_MMBASE, &temp);
222 temp = (temp & PCI_BASE_ADDRESS_MEM_MASK);
223 amd_irongate_private.registers = (volatile u8 __iomem *) ioremap(temp, 4096);
224
225 /* Write out the address of the gatt table */
226 writel(agp_bridge->gatt_bus_addr, amd_irongate_private.registers+AMD_ATTBASE);
227 readl(amd_irongate_private.registers+AMD_ATTBASE); /* PCI Posting. */
228
229 /* Write the Sync register */
230 pci_write_config_byte(agp_bridge->dev, AMD_MODECNTL, 0x80);
231
232 /* Set indexing mode */
233 pci_write_config_byte(agp_bridge->dev, AMD_MODECNTL2, 0x00);
234
235 /* Write the enable register */
236 enable_reg = readw(amd_irongate_private.registers+AMD_GARTENABLE);
237 enable_reg = (enable_reg | 0x0004);
238 writew(enable_reg, amd_irongate_private.registers+AMD_GARTENABLE);
239 readw(amd_irongate_private.registers+AMD_GARTENABLE); /* PCI Posting. */
240
241 /* Write out the size register */
242 pci_read_config_dword(agp_bridge->dev, AMD_APSIZE, &temp);
243 temp = (((temp & ~(0x0000000e)) | current_size->size_value) | 1);
244 pci_write_config_dword(agp_bridge->dev, AMD_APSIZE, temp);
245
246 /* Flush the tlb */
247 writel(1, amd_irongate_private.registers+AMD_TLBFLUSH);
248 readl(amd_irongate_private.registers+AMD_TLBFLUSH); /* PCI Posting.*/
249 return 0;
250 }
251
252 static void amd_irongate_cleanup(void)
253 {
254 struct aper_size_info_lvl2 *previous_size;
255 u32 temp;
256 u16 enable_reg;
257
258 previous_size = A_SIZE_LVL2(agp_bridge->previous_size);
259
260 enable_reg = readw(amd_irongate_private.registers+AMD_GARTENABLE);
261 enable_reg = (enable_reg & ~(0x0004));
262 writew(enable_reg, amd_irongate_private.registers+AMD_GARTENABLE);
263 readw(amd_irongate_private.registers+AMD_GARTENABLE); /* PCI Posting. */
264
265 /* Write back the previous size and disable gart translation */
266 pci_read_config_dword(agp_bridge->dev, AMD_APSIZE, &temp);
267 temp = ((temp & ~(0x0000000f)) | previous_size->size_value);
268 pci_write_config_dword(agp_bridge->dev, AMD_APSIZE, temp);
269 iounmap((void __iomem *) amd_irongate_private.registers);
270 }
271
272 /*
273 * This routine could be implemented by taking the addresses
274 * written to the GATT, and flushing them individually. However
275 * currently it just flushes the whole table. Which is probably
276 * more efficent, since agp_memory blocks can be a large number of
277 * entries.
278 */
279
280 static void amd_irongate_tlbflush(struct agp_memory *temp)
281 {
282 writel(1, amd_irongate_private.registers+AMD_TLBFLUSH);
283 readl(amd_irongate_private.registers+AMD_TLBFLUSH); /* PCI Posting. */
284 }
285
286 static int amd_insert_memory(struct agp_memory *mem, off_t pg_start, int type)
287 {
288 int i, j, num_entries;
289 unsigned long __iomem *cur_gatt;
290 unsigned long addr;
291
292 num_entries = A_SIZE_LVL2(agp_bridge->current_size)->num_entries;
293
294 if (type != 0 || mem->type != 0)
295 return -EINVAL;
296
297 if ((pg_start + mem->page_count) > num_entries)
298 return -EINVAL;
299
300 j = pg_start;
301 while (j < (pg_start + mem->page_count)) {
302 addr = (j * PAGE_SIZE) + agp_bridge->gart_bus_addr;
303 cur_gatt = GET_GATT(addr);
304 if (!PGE_EMPTY(agp_bridge, readl(cur_gatt+GET_GATT_OFF(addr))))
305 return -EBUSY;
306 j++;
307 }
308
309 if (mem->is_flushed == FALSE) {
310 global_cache_flush();
311 mem->is_flushed = TRUE;
312 }
313
314 for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
315 addr = (j * PAGE_SIZE) + agp_bridge->gart_bus_addr;
316 cur_gatt = GET_GATT(addr);
317 writel(agp_generic_mask_memory(agp_bridge,
318 mem->memory[i], mem->type), cur_gatt+GET_GATT_OFF(addr));
319 readl(cur_gatt+GET_GATT_OFF(addr)); /* PCI Posting. */
320 }
321 amd_irongate_tlbflush(mem);
322 return 0;
323 }
324
325 static int amd_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
326 {
327 int i;
328 unsigned long __iomem *cur_gatt;
329 unsigned long addr;
330
331 if (type != 0 || mem->type != 0)
332 return -EINVAL;
333
334 for (i = pg_start; i < (mem->page_count + pg_start); i++) {
335 addr = (i * PAGE_SIZE) + agp_bridge->gart_bus_addr;
336 cur_gatt = GET_GATT(addr);
337 writel(agp_bridge->scratch_page, cur_gatt+GET_GATT_OFF(addr));
338 readl(cur_gatt+GET_GATT_OFF(addr)); /* PCI Posting. */
339 }
340
341 amd_irongate_tlbflush(mem);
342 return 0;
343 }
344
345 static struct aper_size_info_lvl2 amd_irongate_sizes[7] =
346 {
347 {2048, 524288, 0x0000000c},
348 {1024, 262144, 0x0000000a},
349 {512, 131072, 0x00000008},
350 {256, 65536, 0x00000006},
351 {128, 32768, 0x00000004},
352 {64, 16384, 0x00000002},
353 {32, 8192, 0x00000000}
354 };
355
356 static struct gatt_mask amd_irongate_masks[] =
357 {
358 {.mask = 1, .type = 0}
359 };
360
361 struct agp_bridge_driver amd_irongate_driver = {
362 .owner = THIS_MODULE,
363 .aperture_sizes = amd_irongate_sizes,
364 .size_type = LVL2_APER_SIZE,
365 .num_aperture_sizes = 7,
366 .configure = amd_irongate_configure,
367 .fetch_size = amd_irongate_fetch_size,
368 .cleanup = amd_irongate_cleanup,
369 .tlb_flush = amd_irongate_tlbflush,
370 .mask_memory = agp_generic_mask_memory,
371 .masks = amd_irongate_masks,
372 .agp_enable = agp_generic_enable,
373 .cache_flush = global_cache_flush,
374 .create_gatt_table = amd_create_gatt_table,
375 .free_gatt_table = amd_free_gatt_table,
376 .insert_memory = amd_insert_memory,
377 .remove_memory = amd_remove_memory,
378 .alloc_by_type = agp_generic_alloc_by_type,
379 .free_by_type = agp_generic_free_by_type,
380 .agp_alloc_page = agp_generic_alloc_page,
381 .agp_destroy_page = agp_generic_destroy_page,
382 };
383
384 static struct agp_device_ids amd_agp_device_ids[] __devinitdata =
385 {
386 {
387 .device_id = PCI_DEVICE_ID_AMD_FE_GATE_7006,
388 .chipset_name = "Irongate",
389 },
390 {
391 .device_id = PCI_DEVICE_ID_AMD_FE_GATE_700E,
392 .chipset_name = "761",
393 },
394 {
395 .device_id = PCI_DEVICE_ID_AMD_FE_GATE_700C,
396 .chipset_name = "760MP",
397 },
398 { }, /* dummy final entry, always present */
399 };
400
401 static int __devinit agp_amdk7_probe(struct pci_dev *pdev,
402 const struct pci_device_id *ent)
403 {
404 struct agp_bridge_data *bridge;
405 u8 cap_ptr;
406 int j;
407
408 cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP);
409 if (!cap_ptr)
410 return -ENODEV;
411
412 j = ent - agp_amdk7_pci_table;
413 printk(KERN_INFO PFX "Detected AMD %s chipset\n",
414 amd_agp_device_ids[j].chipset_name);
415
416 bridge = agp_alloc_bridge();
417 if (!bridge)
418 return -ENOMEM;
419
420 bridge->driver = &amd_irongate_driver;
421 bridge->dev_private_data = &amd_irongate_private,
422 bridge->dev = pdev;
423 bridge->capndx = cap_ptr;
424
425 /* 751 Errata (22564_B-1.PDF)
426 erratum 20: strobe glitch with Nvidia NV10 GeForce cards.
427 system controller may experience noise due to strong drive strengths
428 */
429 if (agp_bridge->dev->device == PCI_DEVICE_ID_AMD_FE_GATE_7006) {
430 u8 cap_ptr=0;
431 struct pci_dev *gfxcard=NULL;
432 while (!cap_ptr) {
433 gfxcard = pci_get_class(PCI_CLASS_DISPLAY_VGA<<8, gfxcard);
434 if (!gfxcard) {
435 printk (KERN_INFO PFX "Couldn't find an AGP VGA controller.\n");
436 return -ENODEV;
437 }
438 cap_ptr = pci_find_capability(gfxcard, PCI_CAP_ID_AGP);
439 if (!cap_ptr) {
440 pci_dev_put(gfxcard);
441 continue;
442 }
443 }
444
445 /* With so many variants of NVidia cards, it's simpler just
446 to blacklist them all, and then whitelist them as needed
447 (if necessary at all). */
448 if (gfxcard->vendor == PCI_VENDOR_ID_NVIDIA) {
449 agp_bridge->flags |= AGP_ERRATA_1X;
450 printk (KERN_INFO PFX "AMD 751 chipset with NVidia GeForce detected. Forcing to 1X due to errata.\n");
451 }
452 pci_dev_put(gfxcard);
453 }
454
455 /* 761 Errata (23613_F.pdf)
456 * Revisions B0/B1 were a disaster.
457 * erratum 44: SYSCLK/AGPCLK skew causes 2X failures -- Force mode to 1X
458 * erratum 45: Timing problem prevents fast writes -- Disable fast write.
459 * erratum 46: Setup violation on AGP SBA pins - Disable side band addressing.
460 * With this lot disabled, we should prevent lockups. */
461 if (agp_bridge->dev->device == PCI_DEVICE_ID_AMD_FE_GATE_700E) {
462 u8 revision=0;
463 pci_read_config_byte(pdev, PCI_REVISION_ID, &revision);
464 if (revision == 0x10 || revision == 0x11) {
465 agp_bridge->flags = AGP_ERRATA_FASTWRITES;
466 agp_bridge->flags |= AGP_ERRATA_SBA;
467 agp_bridge->flags |= AGP_ERRATA_1X;
468 printk (KERN_INFO PFX "AMD 761 chipset with errata detected - disabling AGP fast writes & SBA and forcing to 1X.\n");
469 }
470 }
471
472 /* Fill in the mode register */
473 pci_read_config_dword(pdev,
474 bridge->capndx+PCI_AGP_STATUS,
475 &bridge->mode);
476
477 pci_set_drvdata(pdev, bridge);
478 return agp_add_bridge(bridge);
479 }
480
481 static void __devexit agp_amdk7_remove(struct pci_dev *pdev)
482 {
483 struct agp_bridge_data *bridge = pci_get_drvdata(pdev);
484
485 agp_remove_bridge(bridge);
486 agp_put_bridge(bridge);
487 }
488
489 /* must be the same order as name table above */
490 static struct pci_device_id agp_amdk7_pci_table[] = {
491 {
492 .class = (PCI_CLASS_BRIDGE_HOST << 8),
493 .class_mask = ~0,
494 .vendor = PCI_VENDOR_ID_AMD,
495 .device = PCI_DEVICE_ID_AMD_FE_GATE_7006,
496 .subvendor = PCI_ANY_ID,
497 .subdevice = PCI_ANY_ID,
498 },
499 {
500 .class = (PCI_CLASS_BRIDGE_HOST << 8),
501 .class_mask = ~0,
502 .vendor = PCI_VENDOR_ID_AMD,
503 .device = PCI_DEVICE_ID_AMD_FE_GATE_700E,
504 .subvendor = PCI_ANY_ID,
505 .subdevice = PCI_ANY_ID,
506 },
507 {
508 .class = (PCI_CLASS_BRIDGE_HOST << 8),
509 .class_mask = ~0,
510 .vendor = PCI_VENDOR_ID_AMD,
511 .device = PCI_DEVICE_ID_AMD_FE_GATE_700C,
512 .subvendor = PCI_ANY_ID,
513 .subdevice = PCI_ANY_ID,
514 },
515 { }
516 };
517
518 MODULE_DEVICE_TABLE(pci, agp_amdk7_pci_table);
519
520 static struct pci_driver agp_amdk7_pci_driver = {
521 .name = "agpgart-amdk7",
522 .id_table = agp_amdk7_pci_table,
523 .probe = agp_amdk7_probe,
524 .remove = agp_amdk7_remove,
525 };
526
527 static int __init agp_amdk7_init(void)
528 {
529 if (agp_off)
530 return -EINVAL;
531 return pci_register_driver(&agp_amdk7_pci_driver);
532 }
533
534 static void __exit agp_amdk7_cleanup(void)
535 {
536 pci_unregister_driver(&agp_amdk7_pci_driver);
537 }
538
539 module_init(agp_amdk7_init);
540 module_exit(agp_amdk7_cleanup);
541
542 MODULE_LICENSE("GPL and additional rights");
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