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Linux 2.6.26-rc5
[linux-2.6/openmoko-kernel/knife-kernel.git] / drivers / char / agp / amd-k7-agp.c
blob96bdb9296b0758832214aad8393f37569d258916
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 #ifndef CONFIG_X86
45 SetPageReserved(virt_to_page(page_map->real));
46 global_cache_flush();
47 page_map->remapped = ioremap_nocache(virt_to_gart(page_map->real),
48 PAGE_SIZE);
49 if (page_map->remapped == NULL) {
50 ClearPageReserved(virt_to_page(page_map->real));
51 free_page((unsigned long) page_map->real);
52 page_map->real = NULL;
53 return -ENOMEM;
54 }
55 global_cache_flush();
56 #else
57 set_memory_uc((unsigned long)page_map->real, 1);
58 page_map->remapped = page_map->real;
59 #endif
60
61 for (i = 0; i < PAGE_SIZE / sizeof(unsigned long); i++) {
62 writel(agp_bridge->scratch_page, page_map->remapped+i);
63 readl(page_map->remapped+i); /* PCI Posting. */
64 }
65
66 return 0;
67 }
68
69 static void amd_free_page_map(struct amd_page_map *page_map)
70 {
71 #ifndef CONFIG_X86
72 iounmap(page_map->remapped);
73 ClearPageReserved(virt_to_page(page_map->real));
74 #else
75 set_memory_wb((unsigned long)page_map->real, 1);
76 #endif
77 free_page((unsigned long) page_map->real);
78 }
79
80 static void amd_free_gatt_pages(void)
81 {
82 int i;
83 struct amd_page_map **tables;
84 struct amd_page_map *entry;
85
86 tables = amd_irongate_private.gatt_pages;
87 for (i = 0; i < amd_irongate_private.num_tables; i++) {
88 entry = tables[i];
89 if (entry != NULL) {
90 if (entry->real != NULL)
91 amd_free_page_map(entry);
92 kfree(entry);
93 }
94 }
95 kfree(tables);
96 amd_irongate_private.gatt_pages = NULL;
97 }
98
99 static int amd_create_gatt_pages(int nr_tables)
100 {
101 struct amd_page_map **tables;
102 struct amd_page_map *entry;
103 int retval = 0;
104 int i;
105
106 tables = kzalloc((nr_tables + 1) * sizeof(struct amd_page_map *),GFP_KERNEL);
107 if (tables == NULL)
108 return -ENOMEM;
109
110 for (i = 0; i < nr_tables; i++) {
111 entry = kzalloc(sizeof(struct amd_page_map), GFP_KERNEL);
112 tables[i] = entry;
113 if (entry == NULL) {
114 retval = -ENOMEM;
115 break;
116 }
117 retval = amd_create_page_map(entry);
118 if (retval != 0)
119 break;
120 }
121 amd_irongate_private.num_tables = i;
122 amd_irongate_private.gatt_pages = tables;
123
124 if (retval != 0)
125 amd_free_gatt_pages();
126
127 return retval;
128 }
129
130 /* Since we don't need contiguous memory we just try
131 * to get the gatt table once
132 */
133
134 #define GET_PAGE_DIR_OFF(addr) (addr >> 22)
135 #define GET_PAGE_DIR_IDX(addr) (GET_PAGE_DIR_OFF(addr) - \
136 GET_PAGE_DIR_OFF(agp_bridge->gart_bus_addr))
137 #define GET_GATT_OFF(addr) ((addr & 0x003ff000) >> 12)
138 #define GET_GATT(addr) (amd_irongate_private.gatt_pages[\
139 GET_PAGE_DIR_IDX(addr)]->remapped)
140
141 static int amd_create_gatt_table(struct agp_bridge_data *bridge)
142 {
143 struct aper_size_info_lvl2 *value;
144 struct amd_page_map page_dir;
145 unsigned long addr;
146 int retval;
147 u32 temp;
148 int i;
149
150 value = A_SIZE_LVL2(agp_bridge->current_size);
151 retval = amd_create_page_map(&page_dir);
152 if (retval != 0)
153 return retval;
154
155 retval = amd_create_gatt_pages(value->num_entries / 1024);
156 if (retval != 0) {
157 amd_free_page_map(&page_dir);
158 return retval;
159 }
160
161 agp_bridge->gatt_table_real = (u32 *)page_dir.real;
162 agp_bridge->gatt_table = (u32 __iomem *)page_dir.remapped;
163 agp_bridge->gatt_bus_addr = virt_to_gart(page_dir.real);
164
165 /* Get the address for the gart region.
166 * This is a bus address even on the alpha, b/c its
167 * used to program the agp master not the cpu
168 */
169
170 pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &temp);
171 addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
172 agp_bridge->gart_bus_addr = addr;
173
174 /* Calculate the agp offset */
175 for (i = 0; i < value->num_entries / 1024; i++, addr += 0x00400000) {
176 writel(virt_to_gart(amd_irongate_private.gatt_pages[i]->real) | 1,
177 page_dir.remapped+GET_PAGE_DIR_OFF(addr));
178 readl(page_dir.remapped+GET_PAGE_DIR_OFF(addr)); /* PCI Posting. */
179 }
180
181 return 0;
182 }
183
184 static int amd_free_gatt_table(struct agp_bridge_data *bridge)
185 {
186 struct amd_page_map page_dir;
187
188 page_dir.real = (unsigned long *)agp_bridge->gatt_table_real;
189 page_dir.remapped = (unsigned long __iomem *)agp_bridge->gatt_table;
190
191 amd_free_gatt_pages();
192 amd_free_page_map(&page_dir);
193 return 0;
194 }
195
196 static int amd_irongate_fetch_size(void)
197 {
198 int i;
199 u32 temp;
200 struct aper_size_info_lvl2 *values;
201
202 pci_read_config_dword(agp_bridge->dev, AMD_APSIZE, &temp);
203 temp = (temp & 0x0000000e);
204 values = A_SIZE_LVL2(agp_bridge->driver->aperture_sizes);
205 for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
206 if (temp == values[i].size_value) {
207 agp_bridge->previous_size =
208 agp_bridge->current_size = (void *) (values + i);
209
210 agp_bridge->aperture_size_idx = i;
211 return values[i].size;
212 }
213 }
214
215 return 0;
216 }
217
218 static int amd_irongate_configure(void)
219 {
220 struct aper_size_info_lvl2 *current_size;
221 u32 temp;
222 u16 enable_reg;
223
224 current_size = A_SIZE_LVL2(agp_bridge->current_size);
225
226 /* Get the memory mapped registers */
227 pci_read_config_dword(agp_bridge->dev, AMD_MMBASE, &temp);
228 temp = (temp & PCI_BASE_ADDRESS_MEM_MASK);
229 amd_irongate_private.registers = (volatile u8 __iomem *) ioremap(temp, 4096);
230 if (!amd_irongate_private.registers)
231 return -ENOMEM;
232
233 /* Write out the address of the gatt table */
234 writel(agp_bridge->gatt_bus_addr, amd_irongate_private.registers+AMD_ATTBASE);
235 readl(amd_irongate_private.registers+AMD_ATTBASE); /* PCI Posting. */
236
237 /* Write the Sync register */
238 pci_write_config_byte(agp_bridge->dev, AMD_MODECNTL, 0x80);
239
240 /* Set indexing mode */
241 pci_write_config_byte(agp_bridge->dev, AMD_MODECNTL2, 0x00);
242
243 /* Write the enable register */
244 enable_reg = readw(amd_irongate_private.registers+AMD_GARTENABLE);
245 enable_reg = (enable_reg | 0x0004);
246 writew(enable_reg, amd_irongate_private.registers+AMD_GARTENABLE);
247 readw(amd_irongate_private.registers+AMD_GARTENABLE); /* PCI Posting. */
248
249 /* Write out the size register */
250 pci_read_config_dword(agp_bridge->dev, AMD_APSIZE, &temp);
251 temp = (((temp & ~(0x0000000e)) | current_size->size_value) | 1);
252 pci_write_config_dword(agp_bridge->dev, AMD_APSIZE, temp);
253
254 /* Flush the tlb */
255 writel(1, amd_irongate_private.registers+AMD_TLBFLUSH);
256 readl(amd_irongate_private.registers+AMD_TLBFLUSH); /* PCI Posting.*/
257 return 0;
258 }
259
260 static void amd_irongate_cleanup(void)
261 {
262 struct aper_size_info_lvl2 *previous_size;
263 u32 temp;
264 u16 enable_reg;
265
266 previous_size = A_SIZE_LVL2(agp_bridge->previous_size);
267
268 enable_reg = readw(amd_irongate_private.registers+AMD_GARTENABLE);
269 enable_reg = (enable_reg & ~(0x0004));
270 writew(enable_reg, amd_irongate_private.registers+AMD_GARTENABLE);
271 readw(amd_irongate_private.registers+AMD_GARTENABLE); /* PCI Posting. */
272
273 /* Write back the previous size and disable gart translation */
274 pci_read_config_dword(agp_bridge->dev, AMD_APSIZE, &temp);
275 temp = ((temp & ~(0x0000000f)) | previous_size->size_value);
276 pci_write_config_dword(agp_bridge->dev, AMD_APSIZE, temp);
277 iounmap((void __iomem *) amd_irongate_private.registers);
278 }
279
280 /*
281 * This routine could be implemented by taking the addresses
282 * written to the GATT, and flushing them individually. However
283 * currently it just flushes the whole table. Which is probably
284 * more efficent, since agp_memory blocks can be a large number of
285 * entries.
286 */
287
288 static void amd_irongate_tlbflush(struct agp_memory *temp)
289 {
290 writel(1, amd_irongate_private.registers+AMD_TLBFLUSH);
291 readl(amd_irongate_private.registers+AMD_TLBFLUSH); /* PCI Posting. */
292 }
293
294 static int amd_insert_memory(struct agp_memory *mem, off_t pg_start, int type)
295 {
296 int i, j, num_entries;
297 unsigned long __iomem *cur_gatt;
298 unsigned long addr;
299
300 num_entries = A_SIZE_LVL2(agp_bridge->current_size)->num_entries;
301
302 if (type != 0 || mem->type != 0)
303 return -EINVAL;
304
305 if ((pg_start + mem->page_count) > num_entries)
306 return -EINVAL;
307
308 j = pg_start;
309 while (j < (pg_start + mem->page_count)) {
310 addr = (j * PAGE_SIZE) + agp_bridge->gart_bus_addr;
311 cur_gatt = GET_GATT(addr);
312 if (!PGE_EMPTY(agp_bridge, readl(cur_gatt+GET_GATT_OFF(addr))))
313 return -EBUSY;
314 j++;
315 }
316
317 if (mem->is_flushed == FALSE) {
318 global_cache_flush();
319 mem->is_flushed = TRUE;
320 }
321
322 for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
323 addr = (j * PAGE_SIZE) + agp_bridge->gart_bus_addr;
324 cur_gatt = GET_GATT(addr);
325 writel(agp_generic_mask_memory(agp_bridge,
326 mem->memory[i], mem->type), cur_gatt+GET_GATT_OFF(addr));
327 readl(cur_gatt+GET_GATT_OFF(addr)); /* PCI Posting. */
328 }
329 amd_irongate_tlbflush(mem);
330 return 0;
331 }
332
333 static int amd_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
334 {
335 int i;
336 unsigned long __iomem *cur_gatt;
337 unsigned long addr;
338
339 if (type != 0 || mem->type != 0)
340 return -EINVAL;
341
342 for (i = pg_start; i < (mem->page_count + pg_start); i++) {
343 addr = (i * PAGE_SIZE) + agp_bridge->gart_bus_addr;
344 cur_gatt = GET_GATT(addr);
345 writel(agp_bridge->scratch_page, cur_gatt+GET_GATT_OFF(addr));
346 readl(cur_gatt+GET_GATT_OFF(addr)); /* PCI Posting. */
347 }
348
349 amd_irongate_tlbflush(mem);
350 return 0;
351 }
352
353 static const struct aper_size_info_lvl2 amd_irongate_sizes[7] =
354 {
355 {2048, 524288, 0x0000000c},
356 {1024, 262144, 0x0000000a},
357 {512, 131072, 0x00000008},
358 {256, 65536, 0x00000006},
359 {128, 32768, 0x00000004},
360 {64, 16384, 0x00000002},
361 {32, 8192, 0x00000000}
362 };
363
364 static const struct gatt_mask amd_irongate_masks[] =
365 {
366 {.mask = 1, .type = 0}
367 };
368
369 static const struct agp_bridge_driver amd_irongate_driver = {
370 .owner = THIS_MODULE,
371 .aperture_sizes = amd_irongate_sizes,
372 .size_type = LVL2_APER_SIZE,
373 .num_aperture_sizes = 7,
374 .configure = amd_irongate_configure,
375 .fetch_size = amd_irongate_fetch_size,
376 .cleanup = amd_irongate_cleanup,
377 .tlb_flush = amd_irongate_tlbflush,
378 .mask_memory = agp_generic_mask_memory,
379 .masks = amd_irongate_masks,
380 .agp_enable = agp_generic_enable,
381 .cache_flush = global_cache_flush,
382 .create_gatt_table = amd_create_gatt_table,
383 .free_gatt_table = amd_free_gatt_table,
384 .insert_memory = amd_insert_memory,
385 .remove_memory = amd_remove_memory,
386 .alloc_by_type = agp_generic_alloc_by_type,
387 .free_by_type = agp_generic_free_by_type,
388 .agp_alloc_page = agp_generic_alloc_page,
389 .agp_destroy_page = agp_generic_destroy_page,
390 .agp_type_to_mask_type = agp_generic_type_to_mask_type,
391 };
392
393 static struct agp_device_ids amd_agp_device_ids[] __devinitdata =
394 {
395 {
396 .device_id = PCI_DEVICE_ID_AMD_FE_GATE_7006,
397 .chipset_name = "Irongate",
398 },
399 {
400 .device_id = PCI_DEVICE_ID_AMD_FE_GATE_700E,
401 .chipset_name = "761",
402 },
403 {
404 .device_id = PCI_DEVICE_ID_AMD_FE_GATE_700C,
405 .chipset_name = "760MP",
406 },
407 { }, /* dummy final entry, always present */
408 };
409
410 static int __devinit agp_amdk7_probe(struct pci_dev *pdev,
411 const struct pci_device_id *ent)
412 {
413 struct agp_bridge_data *bridge;
414 u8 cap_ptr;
415 int j;
416
417 cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP);
418 if (!cap_ptr)
419 return -ENODEV;
420
421 j = ent - agp_amdk7_pci_table;
422 printk(KERN_INFO PFX "Detected AMD %s chipset\n",
423 amd_agp_device_ids[j].chipset_name);
424
425 bridge = agp_alloc_bridge();
426 if (!bridge)
427 return -ENOMEM;
428
429 bridge->driver = &amd_irongate_driver;
430 bridge->dev_private_data = &amd_irongate_private,
431 bridge->dev = pdev;
432 bridge->capndx = cap_ptr;
433
434 /* 751 Errata (22564_B-1.PDF)
435 erratum 20: strobe glitch with Nvidia NV10 GeForce cards.
436 system controller may experience noise due to strong drive strengths
437 */
438 if (agp_bridge->dev->device == PCI_DEVICE_ID_AMD_FE_GATE_7006) {
439 struct pci_dev *gfxcard=NULL;
440
441 cap_ptr = 0;
442 while (!cap_ptr) {
443 gfxcard = pci_get_class(PCI_CLASS_DISPLAY_VGA<<8, gfxcard);
444 if (!gfxcard) {
445 printk (KERN_INFO PFX "Couldn't find an AGP VGA controller.\n");
446 return -ENODEV;
447 }
448 cap_ptr = pci_find_capability(gfxcard, PCI_CAP_ID_AGP);
449 }
450
451 /* With so many variants of NVidia cards, it's simpler just
452 to blacklist them all, and then whitelist them as needed
453 (if necessary at all). */
454 if (gfxcard->vendor == PCI_VENDOR_ID_NVIDIA) {
455 agp_bridge->flags |= AGP_ERRATA_1X;
456 printk (KERN_INFO PFX "AMD 751 chipset with NVidia GeForce detected. Forcing to 1X due to errata.\n");
457 }
458 pci_dev_put(gfxcard);
459 }
460
461 /* 761 Errata (23613_F.pdf)
462 * Revisions B0/B1 were a disaster.
463 * erratum 44: SYSCLK/AGPCLK skew causes 2X failures -- Force mode to 1X
464 * erratum 45: Timing problem prevents fast writes -- Disable fast write.
465 * erratum 46: Setup violation on AGP SBA pins - Disable side band addressing.
466 * With this lot disabled, we should prevent lockups. */
467 if (agp_bridge->dev->device == PCI_DEVICE_ID_AMD_FE_GATE_700E) {
468 if (pdev->revision == 0x10 || pdev->revision == 0x11) {
469 agp_bridge->flags = AGP_ERRATA_FASTWRITES;
470 agp_bridge->flags |= AGP_ERRATA_SBA;
471 agp_bridge->flags |= AGP_ERRATA_1X;
472 printk (KERN_INFO PFX "AMD 761 chipset with errata detected - disabling AGP fast writes & SBA and forcing to 1X.\n");
473 }
474 }
475
476 /* Fill in the mode register */
477 pci_read_config_dword(pdev,
478 bridge->capndx+PCI_AGP_STATUS,
479 &bridge->mode);
480
481 pci_set_drvdata(pdev, bridge);
482 return agp_add_bridge(bridge);
483 }
484
485 static void __devexit agp_amdk7_remove(struct pci_dev *pdev)
486 {
487 struct agp_bridge_data *bridge = pci_get_drvdata(pdev);
488
489 agp_remove_bridge(bridge);
490 agp_put_bridge(bridge);
491 }
492
493 /* must be the same order as name table above */
494 static struct pci_device_id agp_amdk7_pci_table[] = {
495 {
496 .class = (PCI_CLASS_BRIDGE_HOST << 8),
497 .class_mask = ~0,
498 .vendor = PCI_VENDOR_ID_AMD,
499 .device = PCI_DEVICE_ID_AMD_FE_GATE_7006,
500 .subvendor = PCI_ANY_ID,
501 .subdevice = PCI_ANY_ID,
502 },
503 {
504 .class = (PCI_CLASS_BRIDGE_HOST << 8),
505 .class_mask = ~0,
506 .vendor = PCI_VENDOR_ID_AMD,
507 .device = PCI_DEVICE_ID_AMD_FE_GATE_700E,
508 .subvendor = PCI_ANY_ID,
509 .subdevice = PCI_ANY_ID,
510 },
511 {
512 .class = (PCI_CLASS_BRIDGE_HOST << 8),
513 .class_mask = ~0,
514 .vendor = PCI_VENDOR_ID_AMD,
515 .device = PCI_DEVICE_ID_AMD_FE_GATE_700C,
516 .subvendor = PCI_ANY_ID,
517 .subdevice = PCI_ANY_ID,
518 },
519 { }
520 };
521
522 MODULE_DEVICE_TABLE(pci, agp_amdk7_pci_table);
523
524 static struct pci_driver agp_amdk7_pci_driver = {
525 .name = "agpgart-amdk7",
526 .id_table = agp_amdk7_pci_table,
527 .probe = agp_amdk7_probe,
528 .remove = agp_amdk7_remove,
529 };
530
531 static int __init agp_amdk7_init(void)
532 {
533 if (agp_off)
534 return -EINVAL;
535 return pci_register_driver(&agp_amdk7_pci_driver);
536 }
537
538 static void __exit agp_amdk7_cleanup(void)
539 {
540 pci_unregister_driver(&agp_amdk7_pci_driver);
541 }
542
543 module_init(agp_amdk7_init);
544 module_exit(agp_amdk7_cleanup);
545
546 MODULE_LICENSE("GPL and additional rights");
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