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Fix calculation in move_freepages_block for counting pages
[linux-2.6/openmoko-kernel/knife-kernel.git] / drivers / char / agp / amd-k7-agp.c
blob1405a42585e13eb29dcb9ae3bce3d99836b9d5fb
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_gart(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 = kzalloc((nr_tables + 1) * sizeof(struct amd_page_map *),GFP_KERNEL);
98 if (tables == NULL)
99 return -ENOMEM;
100
101 for (i = 0; i < nr_tables; i++) {
102 entry = kzalloc(sizeof(struct amd_page_map), GFP_KERNEL);
103 tables[i] = entry;
104 if (entry == NULL) {
105 retval = -ENOMEM;
106 break;
107 }
108 retval = amd_create_page_map(entry);
109 if (retval != 0)
110 break;
111 }
112 amd_irongate_private.num_tables = i;
113 amd_irongate_private.gatt_pages = tables;
114
115 if (retval != 0)
116 amd_free_gatt_pages();
117
118 return retval;
119 }
120
121 /* Since we don't need contiguous memory we just try
122 * to get the gatt table once
123 */
124
125 #define GET_PAGE_DIR_OFF(addr) (addr >> 22)
126 #define GET_PAGE_DIR_IDX(addr) (GET_PAGE_DIR_OFF(addr) - \
127 GET_PAGE_DIR_OFF(agp_bridge->gart_bus_addr))
128 #define GET_GATT_OFF(addr) ((addr & 0x003ff000) >> 12)
129 #define GET_GATT(addr) (amd_irongate_private.gatt_pages[\
130 GET_PAGE_DIR_IDX(addr)]->remapped)
131
132 static int amd_create_gatt_table(struct agp_bridge_data *bridge)
133 {
134 struct aper_size_info_lvl2 *value;
135 struct amd_page_map page_dir;
136 unsigned long addr;
137 int retval;
138 u32 temp;
139 int i;
140
141 value = A_SIZE_LVL2(agp_bridge->current_size);
142 retval = amd_create_page_map(&page_dir);
143 if (retval != 0)
144 return retval;
145
146 retval = amd_create_gatt_pages(value->num_entries / 1024);
147 if (retval != 0) {
148 amd_free_page_map(&page_dir);
149 return retval;
150 }
151
152 agp_bridge->gatt_table_real = (u32 *)page_dir.real;
153 agp_bridge->gatt_table = (u32 __iomem *)page_dir.remapped;
154 agp_bridge->gatt_bus_addr = virt_to_gart(page_dir.real);
155
156 /* Get the address for the gart region.
157 * This is a bus address even on the alpha, b/c its
158 * used to program the agp master not the cpu
159 */
160
161 pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &temp);
162 addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
163 agp_bridge->gart_bus_addr = addr;
164
165 /* Calculate the agp offset */
166 for (i = 0; i < value->num_entries / 1024; i++, addr += 0x00400000) {
167 writel(virt_to_gart(amd_irongate_private.gatt_pages[i]->real) | 1,
168 page_dir.remapped+GET_PAGE_DIR_OFF(addr));
169 readl(page_dir.remapped+GET_PAGE_DIR_OFF(addr)); /* PCI Posting. */
170 }
171
172 return 0;
173 }
174
175 static int amd_free_gatt_table(struct agp_bridge_data *bridge)
176 {
177 struct amd_page_map page_dir;
178
179 page_dir.real = (unsigned long *)agp_bridge->gatt_table_real;
180 page_dir.remapped = (unsigned long __iomem *)agp_bridge->gatt_table;
181
182 amd_free_gatt_pages();
183 amd_free_page_map(&page_dir);
184 return 0;
185 }
186
187 static int amd_irongate_fetch_size(void)
188 {
189 int i;
190 u32 temp;
191 struct aper_size_info_lvl2 *values;
192
193 pci_read_config_dword(agp_bridge->dev, AMD_APSIZE, &temp);
194 temp = (temp & 0x0000000e);
195 values = A_SIZE_LVL2(agp_bridge->driver->aperture_sizes);
196 for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
197 if (temp == values[i].size_value) {
198 agp_bridge->previous_size =
199 agp_bridge->current_size = (void *) (values + i);
200
201 agp_bridge->aperture_size_idx = i;
202 return values[i].size;
203 }
204 }
205
206 return 0;
207 }
208
209 static int amd_irongate_configure(void)
210 {
211 struct aper_size_info_lvl2 *current_size;
212 u32 temp;
213 u16 enable_reg;
214
215 current_size = A_SIZE_LVL2(agp_bridge->current_size);
216
217 /* Get the memory mapped registers */
218 pci_read_config_dword(agp_bridge->dev, AMD_MMBASE, &temp);
219 temp = (temp & PCI_BASE_ADDRESS_MEM_MASK);
220 amd_irongate_private.registers = (volatile u8 __iomem *) ioremap(temp, 4096);
221 if (!amd_irongate_private.registers)
222 return -ENOMEM;
223
224 /* Write out the address of the gatt table */
225 writel(agp_bridge->gatt_bus_addr, amd_irongate_private.registers+AMD_ATTBASE);
226 readl(amd_irongate_private.registers+AMD_ATTBASE); /* PCI Posting. */
227
228 /* Write the Sync register */
229 pci_write_config_byte(agp_bridge->dev, AMD_MODECNTL, 0x80);
230
231 /* Set indexing mode */
232 pci_write_config_byte(agp_bridge->dev, AMD_MODECNTL2, 0x00);
233
234 /* Write the enable register */
235 enable_reg = readw(amd_irongate_private.registers+AMD_GARTENABLE);
236 enable_reg = (enable_reg | 0x0004);
237 writew(enable_reg, amd_irongate_private.registers+AMD_GARTENABLE);
238 readw(amd_irongate_private.registers+AMD_GARTENABLE); /* PCI Posting. */
239
240 /* Write out the size register */
241 pci_read_config_dword(agp_bridge->dev, AMD_APSIZE, &temp);
242 temp = (((temp & ~(0x0000000e)) | current_size->size_value) | 1);
243 pci_write_config_dword(agp_bridge->dev, AMD_APSIZE, temp);
244
245 /* Flush the tlb */
246 writel(1, amd_irongate_private.registers+AMD_TLBFLUSH);
247 readl(amd_irongate_private.registers+AMD_TLBFLUSH); /* PCI Posting.*/
248 return 0;
249 }
250
251 static void amd_irongate_cleanup(void)
252 {
253 struct aper_size_info_lvl2 *previous_size;
254 u32 temp;
255 u16 enable_reg;
256
257 previous_size = A_SIZE_LVL2(agp_bridge->previous_size);
258
259 enable_reg = readw(amd_irongate_private.registers+AMD_GARTENABLE);
260 enable_reg = (enable_reg & ~(0x0004));
261 writew(enable_reg, amd_irongate_private.registers+AMD_GARTENABLE);
262 readw(amd_irongate_private.registers+AMD_GARTENABLE); /* PCI Posting. */
263
264 /* Write back the previous size and disable gart translation */
265 pci_read_config_dword(agp_bridge->dev, AMD_APSIZE, &temp);
266 temp = ((temp & ~(0x0000000f)) | previous_size->size_value);
267 pci_write_config_dword(agp_bridge->dev, AMD_APSIZE, temp);
268 iounmap((void __iomem *) amd_irongate_private.registers);
269 }
270
271 /*
272 * This routine could be implemented by taking the addresses
273 * written to the GATT, and flushing them individually. However
274 * currently it just flushes the whole table. Which is probably
275 * more efficent, since agp_memory blocks can be a large number of
276 * entries.
277 */
278
279 static void amd_irongate_tlbflush(struct agp_memory *temp)
280 {
281 writel(1, amd_irongate_private.registers+AMD_TLBFLUSH);
282 readl(amd_irongate_private.registers+AMD_TLBFLUSH); /* PCI Posting. */
283 }
284
285 static int amd_insert_memory(struct agp_memory *mem, off_t pg_start, int type)
286 {
287 int i, j, num_entries;
288 unsigned long __iomem *cur_gatt;
289 unsigned long addr;
290
291 num_entries = A_SIZE_LVL2(agp_bridge->current_size)->num_entries;
292
293 if (type != 0 || mem->type != 0)
294 return -EINVAL;
295
296 if ((pg_start + mem->page_count) > num_entries)
297 return -EINVAL;
298
299 j = pg_start;
300 while (j < (pg_start + mem->page_count)) {
301 addr = (j * PAGE_SIZE) + agp_bridge->gart_bus_addr;
302 cur_gatt = GET_GATT(addr);
303 if (!PGE_EMPTY(agp_bridge, readl(cur_gatt+GET_GATT_OFF(addr))))
304 return -EBUSY;
305 j++;
306 }
307
308 if (mem->is_flushed == FALSE) {
309 global_cache_flush();
310 mem->is_flushed = TRUE;
311 }
312
313 for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
314 addr = (j * PAGE_SIZE) + agp_bridge->gart_bus_addr;
315 cur_gatt = GET_GATT(addr);
316 writel(agp_generic_mask_memory(agp_bridge,
317 mem->memory[i], mem->type), cur_gatt+GET_GATT_OFF(addr));
318 readl(cur_gatt+GET_GATT_OFF(addr)); /* PCI Posting. */
319 }
320 amd_irongate_tlbflush(mem);
321 return 0;
322 }
323
324 static int amd_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
325 {
326 int i;
327 unsigned long __iomem *cur_gatt;
328 unsigned long addr;
329
330 if (type != 0 || mem->type != 0)
331 return -EINVAL;
332
333 for (i = pg_start; i < (mem->page_count + pg_start); i++) {
334 addr = (i * PAGE_SIZE) + agp_bridge->gart_bus_addr;
335 cur_gatt = GET_GATT(addr);
336 writel(agp_bridge->scratch_page, cur_gatt+GET_GATT_OFF(addr));
337 readl(cur_gatt+GET_GATT_OFF(addr)); /* PCI Posting. */
338 }
339
340 amd_irongate_tlbflush(mem);
341 return 0;
342 }
343
344 static const struct aper_size_info_lvl2 amd_irongate_sizes[7] =
345 {
346 {2048, 524288, 0x0000000c},
347 {1024, 262144, 0x0000000a},
348 {512, 131072, 0x00000008},
349 {256, 65536, 0x00000006},
350 {128, 32768, 0x00000004},
351 {64, 16384, 0x00000002},
352 {32, 8192, 0x00000000}
353 };
354
355 static const struct gatt_mask amd_irongate_masks[] =
356 {
357 {.mask = 1, .type = 0}
358 };
359
360 static const struct agp_bridge_driver amd_irongate_driver = {
361 .owner = THIS_MODULE,
362 .aperture_sizes = amd_irongate_sizes,
363 .size_type = LVL2_APER_SIZE,
364 .num_aperture_sizes = 7,
365 .configure = amd_irongate_configure,
366 .fetch_size = amd_irongate_fetch_size,
367 .cleanup = amd_irongate_cleanup,
368 .tlb_flush = amd_irongate_tlbflush,
369 .mask_memory = agp_generic_mask_memory,
370 .masks = amd_irongate_masks,
371 .agp_enable = agp_generic_enable,
372 .cache_flush = global_cache_flush,
373 .create_gatt_table = amd_create_gatt_table,
374 .free_gatt_table = amd_free_gatt_table,
375 .insert_memory = amd_insert_memory,
376 .remove_memory = amd_remove_memory,
377 .alloc_by_type = agp_generic_alloc_by_type,
378 .free_by_type = agp_generic_free_by_type,
379 .agp_alloc_page = agp_generic_alloc_page,
380 .agp_destroy_page = agp_generic_destroy_page,
381 .agp_type_to_mask_type = agp_generic_type_to_mask_type,
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 if (pdev->revision == 0x10 || pdev->revision == 0x11) {
463 agp_bridge->flags = AGP_ERRATA_FASTWRITES;
464 agp_bridge->flags |= AGP_ERRATA_SBA;
465 agp_bridge->flags |= AGP_ERRATA_1X;
466 printk (KERN_INFO PFX "AMD 761 chipset with errata detected - disabling AGP fast writes & SBA and forcing to 1X.\n");
467 }
468 }
469
470 /* Fill in the mode register */
471 pci_read_config_dword(pdev,
472 bridge->capndx+PCI_AGP_STATUS,
473 &bridge->mode);
474
475 pci_set_drvdata(pdev, bridge);
476 return agp_add_bridge(bridge);
477 }
478
479 static void __devexit agp_amdk7_remove(struct pci_dev *pdev)
480 {
481 struct agp_bridge_data *bridge = pci_get_drvdata(pdev);
482
483 agp_remove_bridge(bridge);
484 agp_put_bridge(bridge);
485 }
486
487 /* must be the same order as name table above */
488 static struct pci_device_id agp_amdk7_pci_table[] = {
489 {
490 .class = (PCI_CLASS_BRIDGE_HOST << 8),
491 .class_mask = ~0,
492 .vendor = PCI_VENDOR_ID_AMD,
493 .device = PCI_DEVICE_ID_AMD_FE_GATE_7006,
494 .subvendor = PCI_ANY_ID,
495 .subdevice = PCI_ANY_ID,
496 },
497 {
498 .class = (PCI_CLASS_BRIDGE_HOST << 8),
499 .class_mask = ~0,
500 .vendor = PCI_VENDOR_ID_AMD,
501 .device = PCI_DEVICE_ID_AMD_FE_GATE_700E,
502 .subvendor = PCI_ANY_ID,
503 .subdevice = PCI_ANY_ID,
504 },
505 {
506 .class = (PCI_CLASS_BRIDGE_HOST << 8),
507 .class_mask = ~0,
508 .vendor = PCI_VENDOR_ID_AMD,
509 .device = PCI_DEVICE_ID_AMD_FE_GATE_700C,
510 .subvendor = PCI_ANY_ID,
511 .subdevice = PCI_ANY_ID,
512 },
513 { }
514 };
515
516 MODULE_DEVICE_TABLE(pci, agp_amdk7_pci_table);
517
518 static struct pci_driver agp_amdk7_pci_driver = {
519 .name = "agpgart-amdk7",
520 .id_table = agp_amdk7_pci_table,
521 .probe = agp_amdk7_probe,
522 .remove = agp_amdk7_remove,
523 };
524
525 static int __init agp_amdk7_init(void)
526 {
527 if (agp_off)
528 return -EINVAL;
529 return pci_register_driver(&agp_amdk7_pci_driver);
530 }
531
532 static void __exit agp_amdk7_cleanup(void)
533 {
534 pci_unregister_driver(&agp_amdk7_pci_driver);
535 }
536
537 module_init(agp_amdk7_init);
538 module_exit(agp_amdk7_cleanup);
539
540 MODULE_LICENSE("GPL and additional rights");
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