1 /*
2 * Serverworks AGPGART routines.
3 */
4
5 #include <linux/module.h>
6 #include <linux/pci.h>
7 #include <linux/init.h>
8 #include <linux/string.h>
9 #include <linux/slab.h>
10 #include <linux/jiffies.h>
11 #include <linux/agp_backend.h>
12 #include <asm/set_memory.h>
13 #include "agp.h"
14
15 #define SVWRKS_COMMAND 0x04
16 #define SVWRKS_APSIZE 0x10
17 #define SVWRKS_MMBASE 0x14
18 #define SVWRKS_CACHING 0x4b
19 #define SVWRKS_AGP_ENABLE 0x60
20 #define SVWRKS_FEATURE 0x68
21
22 #define SVWRKS_SIZE_MASK 0xfe000000
23
24 /* Memory mapped registers */
25 #define SVWRKS_GART_CACHE 0x02
26 #define SVWRKS_GATTBASE 0x04
27 #define SVWRKS_TLBFLUSH 0x10
28 #define SVWRKS_POSTFLUSH 0x14
29 #define SVWRKS_DIRFLUSH 0x0c
30
31
32 struct serverworks_page_map {
33 unsigned long *real;
34 unsigned long __iomem *remapped;
35 };
36
37 static struct _serverworks_private {
38 struct pci_dev *svrwrks_dev; /* device one */
39 volatile u8 __iomem *registers;
40 struct serverworks_page_map **gatt_pages;
41 int num_tables;
42 struct serverworks_page_map scratch_dir;
43
44 int gart_addr_ofs;
45 int mm_addr_ofs;
46 } serverworks_private;
47
serverworks_create_page_map(struct serverworks_page_map * page_map)48 static int serverworks_create_page_map(struct serverworks_page_map *page_map)
49 {
50 int i;
51
52 page_map->real = (unsigned long *) __get_free_page(GFP_KERNEL);
53 if (page_map->real == NULL) {
54 return -ENOMEM;
55 }
56
57 set_memory_uc((unsigned long)page_map->real, 1);
58 page_map->remapped = page_map->real;
59
60 for (i = 0; i < PAGE_SIZE / sizeof(unsigned long); i++)
61 writel(agp_bridge->scratch_page, page_map->remapped+i);
62 /* Red Pen: Everyone else does pci posting flush here */
63
64 return 0;
65 }
66
serverworks_free_page_map(struct serverworks_page_map * page_map)67 static void serverworks_free_page_map(struct serverworks_page_map *page_map)
68 {
69 set_memory_wb((unsigned long)page_map->real, 1);
70 free_page((unsigned long) page_map->real);
71 }
72
serverworks_free_gatt_pages(void)73 static void serverworks_free_gatt_pages(void)
74 {
75 int i;
76 struct serverworks_page_map **tables;
77 struct serverworks_page_map *entry;
78
79 tables = serverworks_private.gatt_pages;
80 for (i = 0; i < serverworks_private.num_tables; i++) {
81 entry = tables[i];
82 if (entry != NULL) {
83 if (entry->real != NULL) {
84 serverworks_free_page_map(entry);
85 }
86 kfree(entry);
87 }
88 }
89 kfree(tables);
90 }
91
serverworks_create_gatt_pages(int nr_tables)92 static int serverworks_create_gatt_pages(int nr_tables)
93 {
94 struct serverworks_page_map **tables;
95 struct serverworks_page_map *entry;
96 int retval = 0;
97 int i;
98
99 tables = kcalloc(nr_tables + 1, sizeof(struct serverworks_page_map *),
100 GFP_KERNEL);
101 if (tables == NULL)
102 return -ENOMEM;
103
104 for (i = 0; i < nr_tables; i++) {
105 entry = kzalloc(sizeof(struct serverworks_page_map), GFP_KERNEL);
106 if (entry == NULL) {
107 retval = -ENOMEM;
108 break;
109 }
110 tables[i] = entry;
111 retval = serverworks_create_page_map(entry);
112 if (retval != 0) break;
113 }
114 serverworks_private.num_tables = nr_tables;
115 serverworks_private.gatt_pages = tables;
116
117 if (retval != 0) serverworks_free_gatt_pages();
118
119 return retval;
120 }
121
122 #define SVRWRKS_GET_GATT(addr) (serverworks_private.gatt_pages[\
123 GET_PAGE_DIR_IDX(addr)]->remapped)
124
125 #ifndef GET_PAGE_DIR_OFF
126 #define GET_PAGE_DIR_OFF(addr) (addr >> 22)
127 #endif
128
129 #ifndef GET_PAGE_DIR_IDX
130 #define GET_PAGE_DIR_IDX(addr) (GET_PAGE_DIR_OFF(addr) - \
131 GET_PAGE_DIR_OFF(agp_bridge->gart_bus_addr))
132 #endif
133
134 #ifndef GET_GATT_OFF
135 #define GET_GATT_OFF(addr) ((addr & 0x003ff000) >> 12)
136 #endif
137
serverworks_create_gatt_table(struct agp_bridge_data * bridge)138 static int serverworks_create_gatt_table(struct agp_bridge_data *bridge)
139 {
140 struct aper_size_info_lvl2 *value;
141 struct serverworks_page_map page_dir;
142 int retval;
143 u32 temp;
144 int i;
145
146 value = A_SIZE_LVL2(agp_bridge->current_size);
147 retval = serverworks_create_page_map(&page_dir);
148 if (retval != 0) {
149 return retval;
150 }
151 retval = serverworks_create_page_map(&serverworks_private.scratch_dir);
152 if (retval != 0) {
153 serverworks_free_page_map(&page_dir);
154 return retval;
155 }
156 /* Create a fake scratch directory */
157 for (i = 0; i < 1024; i++) {
158 writel(agp_bridge->scratch_page, serverworks_private.scratch_dir.remapped+i);
159 writel(virt_to_phys(serverworks_private.scratch_dir.real) | 1, page_dir.remapped+i);
160 }
161
162 retval = serverworks_create_gatt_pages(value->num_entries / 1024);
163 if (retval != 0) {
164 serverworks_free_page_map(&page_dir);
165 serverworks_free_page_map(&serverworks_private.scratch_dir);
166 return retval;
167 }
168
169 agp_bridge->gatt_table_real = (u32 *)page_dir.real;
170 agp_bridge->gatt_table = (u32 __iomem *)page_dir.remapped;
171 agp_bridge->gatt_bus_addr = virt_to_phys(page_dir.real);
172
173 /* Get the address for the gart region.
174 * This is a bus address even on the alpha, b/c its
175 * used to program the agp master not the cpu
176 */
177
178 pci_read_config_dword(agp_bridge->dev,serverworks_private.gart_addr_ofs,&temp);
179 agp_bridge->gart_bus_addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
180
181 /* Calculate the agp offset */
182 for (i = 0; i < value->num_entries / 1024; i++)
183 writel(virt_to_phys(serverworks_private.gatt_pages[i]->real)|1, page_dir.remapped+i);
184
185 return 0;
186 }
187
serverworks_free_gatt_table(struct agp_bridge_data * bridge)188 static int serverworks_free_gatt_table(struct agp_bridge_data *bridge)
189 {
190 struct serverworks_page_map page_dir;
191
192 page_dir.real = (unsigned long *)agp_bridge->gatt_table_real;
193 page_dir.remapped = (unsigned long __iomem *)agp_bridge->gatt_table;
194
195 serverworks_free_gatt_pages();
196 serverworks_free_page_map(&page_dir);
197 serverworks_free_page_map(&serverworks_private.scratch_dir);
198 return 0;
199 }
200
serverworks_fetch_size(void)201 static int serverworks_fetch_size(void)
202 {
203 int i;
204 u32 temp;
205 u32 temp2;
206 struct aper_size_info_lvl2 *values;
207
208 values = A_SIZE_LVL2(agp_bridge->driver->aperture_sizes);
209 pci_read_config_dword(agp_bridge->dev,serverworks_private.gart_addr_ofs,&temp);
210 pci_write_config_dword(agp_bridge->dev,serverworks_private.gart_addr_ofs,
211 SVWRKS_SIZE_MASK);
212 pci_read_config_dword(agp_bridge->dev,serverworks_private.gart_addr_ofs,&temp2);
213 pci_write_config_dword(agp_bridge->dev,serverworks_private.gart_addr_ofs,temp);
214 temp2 &= SVWRKS_SIZE_MASK;
215
216 for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
217 if (temp2 == values[i].size_value) {
218 agp_bridge->previous_size =
219 agp_bridge->current_size = (void *) (values + i);
220
221 agp_bridge->aperture_size_idx = i;
222 return values[i].size;
223 }
224 }
225
226 return 0;
227 }
228
229 /*
230 * This routine could be implemented by taking the addresses
231 * written to the GATT, and flushing them individually. However
232 * currently it just flushes the whole table. Which is probably
233 * more efficient, since agp_memory blocks can be a large number of
234 * entries.
235 */
serverworks_tlbflush(struct agp_memory * temp)236 static void serverworks_tlbflush(struct agp_memory *temp)
237 {
238 unsigned long timeout;
239
240 writeb(1, serverworks_private.registers+SVWRKS_POSTFLUSH);
241 timeout = jiffies + 3*HZ;
242 while (readb(serverworks_private.registers+SVWRKS_POSTFLUSH) == 1) {
243 cpu_relax();
244 if (time_after(jiffies, timeout)) {
245 dev_err(&serverworks_private.svrwrks_dev->dev,
246 "TLB post flush took more than 3 seconds\n");
247 break;
248 }
249 }
250
251 writel(1, serverworks_private.registers+SVWRKS_DIRFLUSH);
252 timeout = jiffies + 3*HZ;
253 while (readl(serverworks_private.registers+SVWRKS_DIRFLUSH) == 1) {
254 cpu_relax();
255 if (time_after(jiffies, timeout)) {
256 dev_err(&serverworks_private.svrwrks_dev->dev,
257 "TLB Dir flush took more than 3 seconds\n");
258 break;
259 }
260 }
261 }
262
serverworks_configure(void)263 static int serverworks_configure(void)
264 {
265 u32 temp;
266 u8 enable_reg;
267 u16 cap_reg;
268
269 /* Get the memory mapped registers */
270 pci_read_config_dword(agp_bridge->dev, serverworks_private.mm_addr_ofs, &temp);
271 temp = (temp & PCI_BASE_ADDRESS_MEM_MASK);
272 serverworks_private.registers = (volatile u8 __iomem *) ioremap(temp, 4096);
273 if (!serverworks_private.registers) {
274 dev_err(&agp_bridge->dev->dev, "can't ioremap(%#x)\n", temp);
275 return -ENOMEM;
276 }
277
278 writeb(0xA, serverworks_private.registers+SVWRKS_GART_CACHE);
279 readb(serverworks_private.registers+SVWRKS_GART_CACHE); /* PCI Posting. */
280
281 writel(agp_bridge->gatt_bus_addr, serverworks_private.registers+SVWRKS_GATTBASE);
282 readl(serverworks_private.registers+SVWRKS_GATTBASE); /* PCI Posting. */
283
284 cap_reg = readw(serverworks_private.registers+SVWRKS_COMMAND);
285 cap_reg &= ~0x0007;
286 cap_reg |= 0x4;
287 writew(cap_reg, serverworks_private.registers+SVWRKS_COMMAND);
288 readw(serverworks_private.registers+SVWRKS_COMMAND);
289
290 pci_read_config_byte(serverworks_private.svrwrks_dev,SVWRKS_AGP_ENABLE, &enable_reg);
291 enable_reg |= 0x1; /* Agp Enable bit */
292 pci_write_config_byte(serverworks_private.svrwrks_dev,SVWRKS_AGP_ENABLE, enable_reg);
293 serverworks_tlbflush(NULL);
294
295 agp_bridge->capndx = pci_find_capability(serverworks_private.svrwrks_dev, PCI_CAP_ID_AGP);
296
297 /* Fill in the mode register */
298 pci_read_config_dword(serverworks_private.svrwrks_dev,
299 agp_bridge->capndx+PCI_AGP_STATUS, &agp_bridge->mode);
300
301 pci_read_config_byte(agp_bridge->dev, SVWRKS_CACHING, &enable_reg);
302 enable_reg &= ~0x3;
303 pci_write_config_byte(agp_bridge->dev, SVWRKS_CACHING, enable_reg);
304
305 pci_read_config_byte(agp_bridge->dev, SVWRKS_FEATURE, &enable_reg);
306 enable_reg |= (1<<6);
307 pci_write_config_byte(agp_bridge->dev,SVWRKS_FEATURE, enable_reg);
308
309 return 0;
310 }
311
serverworks_cleanup(void)312 static void serverworks_cleanup(void)
313 {
314 iounmap((void __iomem *) serverworks_private.registers);
315 }
316
serverworks_insert_memory(struct agp_memory * mem,off_t pg_start,int type)317 static int serverworks_insert_memory(struct agp_memory *mem,
318 off_t pg_start, int type)
319 {
320 int i, j, num_entries;
321 unsigned long __iomem *cur_gatt;
322 unsigned long addr;
323
324 num_entries = A_SIZE_LVL2(agp_bridge->current_size)->num_entries;
325
326 if (type != 0 || mem->type != 0) {
327 return -EINVAL;
328 }
329 if ((pg_start + mem->page_count) > num_entries) {
330 return -EINVAL;
331 }
332
333 j = pg_start;
334 while (j < (pg_start + mem->page_count)) {
335 addr = (j * PAGE_SIZE) + agp_bridge->gart_bus_addr;
336 cur_gatt = SVRWRKS_GET_GATT(addr);
337 if (!PGE_EMPTY(agp_bridge, readl(cur_gatt+GET_GATT_OFF(addr))))
338 return -EBUSY;
339 j++;
340 }
341
342 if (!mem->is_flushed) {
343 global_cache_flush();
344 mem->is_flushed = true;
345 }
346
347 for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
348 addr = (j * PAGE_SIZE) + agp_bridge->gart_bus_addr;
349 cur_gatt = SVRWRKS_GET_GATT(addr);
350 writel(agp_bridge->driver->mask_memory(agp_bridge,
351 page_to_phys(mem->pages[i]), mem->type),
352 cur_gatt+GET_GATT_OFF(addr));
353 }
354 serverworks_tlbflush(mem);
355 return 0;
356 }
357
serverworks_remove_memory(struct agp_memory * mem,off_t pg_start,int type)358 static int serverworks_remove_memory(struct agp_memory *mem, off_t pg_start,
359 int type)
360 {
361 int i;
362 unsigned long __iomem *cur_gatt;
363 unsigned long addr;
364
365 if (type != 0 || mem->type != 0) {
366 return -EINVAL;
367 }
368
369 global_cache_flush();
370 serverworks_tlbflush(mem);
371
372 for (i = pg_start; i < (mem->page_count + pg_start); i++) {
373 addr = (i * PAGE_SIZE) + agp_bridge->gart_bus_addr;
374 cur_gatt = SVRWRKS_GET_GATT(addr);
375 writel(agp_bridge->scratch_page, cur_gatt+GET_GATT_OFF(addr));
376 }
377
378 serverworks_tlbflush(mem);
379 return 0;
380 }
381
382 static const struct gatt_mask serverworks_masks[] =
383 {
384 {.mask = 1, .type = 0}
385 };
386
387 static const struct aper_size_info_lvl2 serverworks_sizes[7] =
388 {
389 {2048, 524288, 0x80000000},
390 {1024, 262144, 0xc0000000},
391 {512, 131072, 0xe0000000},
392 {256, 65536, 0xf0000000},
393 {128, 32768, 0xf8000000},
394 {64, 16384, 0xfc000000},
395 {32, 8192, 0xfe000000}
396 };
397
serverworks_agp_enable(struct agp_bridge_data * bridge,u32 mode)398 static void serverworks_agp_enable(struct agp_bridge_data *bridge, u32 mode)
399 {
400 u32 command;
401
402 pci_read_config_dword(serverworks_private.svrwrks_dev,
403 bridge->capndx + PCI_AGP_STATUS,
404 &command);
405
406 command = agp_collect_device_status(bridge, mode, command);
407
408 command &= ~0x10; /* disable FW */
409 command &= ~0x08;
410
411 command |= 0x100;
412
413 pci_write_config_dword(serverworks_private.svrwrks_dev,
414 bridge->capndx + PCI_AGP_COMMAND,
415 command);
416
417 agp_device_command(command, false);
418 }
419
420 static const struct agp_bridge_driver sworks_driver = {
421 .owner = THIS_MODULE,
422 .aperture_sizes = serverworks_sizes,
423 .size_type = LVL2_APER_SIZE,
424 .num_aperture_sizes = 7,
425 .configure = serverworks_configure,
426 .fetch_size = serverworks_fetch_size,
427 .cleanup = serverworks_cleanup,
428 .tlb_flush = serverworks_tlbflush,
429 .mask_memory = agp_generic_mask_memory,
430 .masks = serverworks_masks,
431 .agp_enable = serverworks_agp_enable,
432 .cache_flush = global_cache_flush,
433 .create_gatt_table = serverworks_create_gatt_table,
434 .free_gatt_table = serverworks_free_gatt_table,
435 .insert_memory = serverworks_insert_memory,
436 .remove_memory = serverworks_remove_memory,
437 .alloc_by_type = agp_generic_alloc_by_type,
438 .free_by_type = agp_generic_free_by_type,
439 .agp_alloc_page = agp_generic_alloc_page,
440 .agp_alloc_pages = agp_generic_alloc_pages,
441 .agp_destroy_page = agp_generic_destroy_page,
442 .agp_destroy_pages = agp_generic_destroy_pages,
443 .agp_type_to_mask_type = agp_generic_type_to_mask_type,
444 };
445
agp_serverworks_probe(struct pci_dev * pdev,const struct pci_device_id * ent)446 static int agp_serverworks_probe(struct pci_dev *pdev,
447 const struct pci_device_id *ent)
448 {
449 struct agp_bridge_data *bridge;
450 struct pci_dev *bridge_dev;
451 u32 temp, temp2;
452 u8 cap_ptr = 0;
453
454 cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP);
455
456 switch (pdev->device) {
457 case 0x0006:
458 dev_err(&pdev->dev, "ServerWorks CNB20HE is unsupported due to lack of documentation\n");
459 return -ENODEV;
460
461 case PCI_DEVICE_ID_SERVERWORKS_HE:
462 case PCI_DEVICE_ID_SERVERWORKS_LE:
463 case 0x0007:
464 break;
465
466 default:
467 if (cap_ptr)
468 dev_err(&pdev->dev, "unsupported Serverworks chipset "
469 "[%04x/%04x]\n", pdev->vendor, pdev->device);
470 return -ENODEV;
471 }
472
473 /* Everything is on func 1 here so we are hardcoding function one */
474 bridge_dev = pci_get_domain_bus_and_slot(pci_domain_nr(pdev->bus),
475 (unsigned int)pdev->bus->number,
476 PCI_DEVFN(0, 1));
477 if (!bridge_dev) {
478 dev_info(&pdev->dev, "can't find secondary device\n");
479 return -ENODEV;
480 }
481
482 serverworks_private.svrwrks_dev = bridge_dev;
483 serverworks_private.gart_addr_ofs = 0x10;
484
485 pci_read_config_dword(pdev, SVWRKS_APSIZE, &temp);
486 if (temp & PCI_BASE_ADDRESS_MEM_TYPE_64) {
487 pci_read_config_dword(pdev, SVWRKS_APSIZE + 4, &temp2);
488 if (temp2 != 0) {
489 dev_info(&pdev->dev, "64 bit aperture address, "
490 "but top bits are not zero; disabling AGP\n");
491 return -ENODEV;
492 }
493 serverworks_private.mm_addr_ofs = 0x18;
494 } else
495 serverworks_private.mm_addr_ofs = 0x14;
496
497 pci_read_config_dword(pdev, serverworks_private.mm_addr_ofs, &temp);
498 if (temp & PCI_BASE_ADDRESS_MEM_TYPE_64) {
499 pci_read_config_dword(pdev,
500 serverworks_private.mm_addr_ofs + 4, &temp2);
501 if (temp2 != 0) {
502 dev_info(&pdev->dev, "64 bit MMIO address, but top "
503 "bits are not zero; disabling AGP\n");
504 return -ENODEV;
505 }
506 }
507
508 bridge = agp_alloc_bridge();
509 if (!bridge)
510 return -ENOMEM;
511
512 bridge->driver = &sworks_driver;
513 bridge->dev_private_data = &serverworks_private;
514 bridge->dev = pci_dev_get(pdev);
515
516 pci_set_drvdata(pdev, bridge);
517 return agp_add_bridge(bridge);
518 }
519
agp_serverworks_remove(struct pci_dev * pdev)520 static void agp_serverworks_remove(struct pci_dev *pdev)
521 {
522 struct agp_bridge_data *bridge = pci_get_drvdata(pdev);
523
524 pci_dev_put(bridge->dev);
525 agp_remove_bridge(bridge);
526 agp_put_bridge(bridge);
527 pci_dev_put(serverworks_private.svrwrks_dev);
528 serverworks_private.svrwrks_dev = NULL;
529 }
530
531 static struct pci_device_id agp_serverworks_pci_table[] = {
532 {
533 .class = (PCI_CLASS_BRIDGE_HOST << 8),
534 .class_mask = ~0,
535 .vendor = PCI_VENDOR_ID_SERVERWORKS,
536 .device = PCI_ANY_ID,
537 .subvendor = PCI_ANY_ID,
538 .subdevice = PCI_ANY_ID,
539 },
540 { }
541 };
542
543 MODULE_DEVICE_TABLE(pci, agp_serverworks_pci_table);
544
545 static struct pci_driver agp_serverworks_pci_driver = {
546 .name = "agpgart-serverworks",
547 .id_table = agp_serverworks_pci_table,
548 .probe = agp_serverworks_probe,
549 .remove = agp_serverworks_remove,
550 };
551
agp_serverworks_init(void)552 static int __init agp_serverworks_init(void)
553 {
554 if (agp_off)
555 return -EINVAL;
556 return pci_register_driver(&agp_serverworks_pci_driver);
557 }
558
agp_serverworks_cleanup(void)559 static void __exit agp_serverworks_cleanup(void)
560 {
561 pci_unregister_driver(&agp_serverworks_pci_driver);
562 }
563
564 module_init(agp_serverworks_init);
565 module_exit(agp_serverworks_cleanup);
566
567 MODULE_DESCRIPTION("Serverworks AGPGART routines");
568 MODULE_LICENSE("GPL and additional rights");
569
570