[PATCH] x86_64: Add cpu_relax() to busy loops in PM timer code
[sfrench/cifs-2.6.git] / drivers / char / agp / ati-agp.c
1 /*
2  * ATi AGPGART routines.
3  */
4
5 #include <linux/types.h>
6 #include <linux/module.h>
7 #include <linux/pci.h>
8 #include <linux/init.h>
9 #include <linux/string.h>
10 #include <linux/slab.h>
11 #include <linux/agp_backend.h>
12 #include <asm/agp.h>
13 #include "agp.h"
14
15 #define ATI_GART_MMBASE_ADDR    0x14
16 #define ATI_RS100_APSIZE        0xac
17 #define ATI_RS100_IG_AGPMODE    0xb0
18 #define ATI_RS300_APSIZE        0xf8
19 #define ATI_RS300_IG_AGPMODE    0xfc
20 #define ATI_GART_FEATURE_ID             0x00
21 #define ATI_GART_BASE                   0x04
22 #define ATI_GART_CACHE_SZBASE           0x08
23 #define ATI_GART_CACHE_CNTRL            0x0c
24 #define ATI_GART_CACHE_ENTRY_CNTRL      0x10
25
26
27 static struct aper_size_info_lvl2 ati_generic_sizes[7] =
28 {
29         {2048, 524288, 0x0000000c},
30         {1024, 262144, 0x0000000a},
31         {512, 131072, 0x00000008},
32         {256, 65536, 0x00000006},
33         {128, 32768, 0x00000004},
34         {64, 16384, 0x00000002},
35         {32, 8192, 0x00000000}
36 };
37
38 static struct gatt_mask ati_generic_masks[] =
39 {
40         { .mask = 1, .type = 0}
41 };
42
43
44
45 typedef struct _ati_page_map {
46         unsigned long *real;
47         unsigned long __iomem *remapped;
48 } ati_page_map;
49
50 static struct _ati_generic_private {
51         volatile u8 __iomem *registers;
52         ati_page_map **gatt_pages;
53         int num_tables;
54 } ati_generic_private;
55
56 static int ati_create_page_map(ati_page_map *page_map)
57 {
58         int i, err = 0;
59
60         page_map->real = (unsigned long *) __get_free_page(GFP_KERNEL);
61         if (page_map->real == NULL)
62                 return -ENOMEM;
63
64         SetPageReserved(virt_to_page(page_map->real));
65         err = map_page_into_agp(virt_to_page(page_map->real));
66         page_map->remapped = ioremap_nocache(virt_to_gart(page_map->real),
67                                             PAGE_SIZE);
68         if (page_map->remapped == NULL || err) {
69                 ClearPageReserved(virt_to_page(page_map->real));
70                 free_page((unsigned long) page_map->real);
71                 page_map->real = NULL;
72                 return -ENOMEM;
73         }
74         /*CACHE_FLUSH();*/
75         global_cache_flush();
76
77         for(i = 0; i < PAGE_SIZE / sizeof(unsigned long); i++) {
78                 writel(agp_bridge->scratch_page, page_map->remapped+i);
79                 readl(page_map->remapped+i);    /* PCI Posting. */
80         }
81
82         return 0;
83 }
84
85
86 static void ati_free_page_map(ati_page_map *page_map)
87 {
88         unmap_page_from_agp(virt_to_page(page_map->real));
89         iounmap(page_map->remapped);
90         ClearPageReserved(virt_to_page(page_map->real));
91         free_page((unsigned long) page_map->real);
92 }
93
94
95 static void ati_free_gatt_pages(void)
96 {
97         int i;
98         ati_page_map **tables;
99         ati_page_map *entry;
100
101         tables = ati_generic_private.gatt_pages;
102         for(i = 0; i < ati_generic_private.num_tables; i++) {
103                 entry = tables[i];
104                 if (entry != NULL) {
105                         if (entry->real != NULL)
106                                 ati_free_page_map(entry);
107                         kfree(entry);
108                 }
109         }
110         kfree(tables);
111 }
112
113
114 static int ati_create_gatt_pages(int nr_tables)
115 {
116         ati_page_map **tables;
117         ati_page_map *entry;
118         int retval = 0;
119         int i;
120
121         tables = kzalloc((nr_tables + 1) * sizeof(ati_page_map *),GFP_KERNEL);
122         if (tables == NULL)
123                 return -ENOMEM;
124
125         for (i = 0; i < nr_tables; i++) {
126                 entry = kzalloc(sizeof(ati_page_map), GFP_KERNEL);
127                 if (entry == NULL) {
128                         while (i>0) {
129                                 kfree (tables[i-1]);
130                                 i--;
131                         }
132                         kfree (tables);
133                         tables = NULL;
134                         retval = -ENOMEM;
135                         break;
136                 }
137                 tables[i] = entry;
138                 retval = ati_create_page_map(entry);
139                 if (retval != 0) break;
140         }
141         ati_generic_private.num_tables = nr_tables;
142         ati_generic_private.gatt_pages = tables;
143
144         if (retval != 0) ati_free_gatt_pages();
145
146         return retval;
147 }
148
149 static int is_r200(void)
150 {
151         if ((agp_bridge->dev->device == PCI_DEVICE_ID_ATI_RS100) ||
152             (agp_bridge->dev->device == PCI_DEVICE_ID_ATI_RS200) ||
153             (agp_bridge->dev->device == PCI_DEVICE_ID_ATI_RS200_B) ||
154             (agp_bridge->dev->device == PCI_DEVICE_ID_ATI_RS250))
155                 return 1;
156         return 0;
157 }
158
159 static int ati_fetch_size(void)
160 {
161         int i;
162         u32 temp;
163         struct aper_size_info_lvl2 *values;
164
165         if (is_r200())
166                 pci_read_config_dword(agp_bridge->dev, ATI_RS100_APSIZE, &temp);
167         else
168                 pci_read_config_dword(agp_bridge->dev, ATI_RS300_APSIZE, &temp);
169
170         temp = (temp & 0x0000000e);
171         values = A_SIZE_LVL2(agp_bridge->driver->aperture_sizes);
172         for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
173                 if (temp == values[i].size_value) {
174                         agp_bridge->previous_size =
175                             agp_bridge->current_size = (void *) (values + i);
176
177                         agp_bridge->aperture_size_idx = i;
178                         return values[i].size;
179                 }
180         }
181
182         return 0;
183 }
184
185 static void ati_tlbflush(struct agp_memory * mem)
186 {
187         writel(1, ati_generic_private.registers+ATI_GART_CACHE_CNTRL);
188         readl(ati_generic_private.registers+ATI_GART_CACHE_CNTRL);      /* PCI Posting. */
189 }
190
191 static void ati_cleanup(void)
192 {
193         struct aper_size_info_lvl2 *previous_size;
194         u32 temp;
195
196         previous_size = A_SIZE_LVL2(agp_bridge->previous_size);
197
198         /* Write back the previous size and disable gart translation */
199         if (is_r200()) {
200                 pci_read_config_dword(agp_bridge->dev, ATI_RS100_APSIZE, &temp);
201                 temp = ((temp & ~(0x0000000f)) | previous_size->size_value);
202                 pci_write_config_dword(agp_bridge->dev, ATI_RS100_APSIZE, temp);
203         } else {
204                 pci_read_config_dword(agp_bridge->dev, ATI_RS300_APSIZE, &temp);
205                 temp = ((temp & ~(0x0000000f)) | previous_size->size_value);
206                 pci_write_config_dword(agp_bridge->dev, ATI_RS300_APSIZE, temp);
207         }
208         iounmap((volatile u8 __iomem *)ati_generic_private.registers);
209 }
210
211
212 static int ati_configure(void)
213 {
214         u32 temp;
215
216         /* Get the memory mapped registers */
217         pci_read_config_dword(agp_bridge->dev, ATI_GART_MMBASE_ADDR, &temp);
218         temp = (temp & 0xfffff000);
219         ati_generic_private.registers = (volatile u8 __iomem *) ioremap(temp, 4096);
220
221         if (is_r200())
222         pci_write_config_dword(agp_bridge->dev, ATI_RS100_IG_AGPMODE, 0x20000);
223         else
224                 pci_write_config_dword(agp_bridge->dev, ATI_RS300_IG_AGPMODE, 0x20000);
225
226         /* address to map too */
227         /*
228         pci_read_config_dword(agp_bridge.dev, AGP_APBASE, &temp);
229         agp_bridge.gart_bus_addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
230         printk(KERN_INFO PFX "IGP320 gart_bus_addr: %x\n", agp_bridge.gart_bus_addr);
231         */
232         writel(0x60000, ati_generic_private.registers+ATI_GART_FEATURE_ID);
233         readl(ati_generic_private.registers+ATI_GART_FEATURE_ID);       /* PCI Posting.*/
234
235         /* SIGNALED_SYSTEM_ERROR @ NB_STATUS */
236         pci_read_config_dword(agp_bridge->dev, 4, &temp);
237         pci_write_config_dword(agp_bridge->dev, 4, temp | (1<<14));
238
239         /* Write out the address of the gatt table */
240         writel(agp_bridge->gatt_bus_addr, ati_generic_private.registers+ATI_GART_BASE);
241         readl(ati_generic_private.registers+ATI_GART_BASE);     /* PCI Posting. */
242
243         return 0;
244 }
245
246
247 #ifdef CONFIG_PM
248 static int agp_ati_resume(struct pci_dev *dev)
249 {
250         pci_restore_state(dev);
251
252         return ati_configure();
253 }
254
255 static int agp_ati_suspend(struct pci_dev *dev, pm_message_t state)
256 {
257         pci_save_state(dev);
258
259         return 0;
260 }
261 #endif
262
263 /*
264  *Since we don't need contigious memory we just try
265  * to get the gatt table once
266  */
267
268 #define GET_PAGE_DIR_OFF(addr) (addr >> 22)
269 #define GET_PAGE_DIR_IDX(addr) (GET_PAGE_DIR_OFF(addr) - \
270         GET_PAGE_DIR_OFF(agp_bridge->gart_bus_addr))
271 #define GET_GATT_OFF(addr) ((addr & 0x003ff000) >> 12)
272 #undef  GET_GATT
273 #define GET_GATT(addr) (ati_generic_private.gatt_pages[\
274         GET_PAGE_DIR_IDX(addr)]->remapped)
275
276 static int ati_insert_memory(struct agp_memory * mem,
277                              off_t pg_start, int type)
278 {
279         int i, j, num_entries;
280         unsigned long __iomem *cur_gatt;
281         unsigned long addr;
282
283         num_entries = A_SIZE_LVL2(agp_bridge->current_size)->num_entries;
284
285         if (type != 0 || mem->type != 0)
286                 return -EINVAL;
287
288         if ((pg_start + mem->page_count) > num_entries)
289                 return -EINVAL;
290
291         j = pg_start;
292         while (j < (pg_start + mem->page_count)) {
293                 addr = (j * PAGE_SIZE) + agp_bridge->gart_bus_addr;
294                 cur_gatt = GET_GATT(addr);
295                 if (!PGE_EMPTY(agp_bridge,readl(cur_gatt+GET_GATT_OFF(addr))))
296                         return -EBUSY;
297                 j++;
298         }
299
300         if (mem->is_flushed == FALSE) {
301                 /*CACHE_FLUSH(); */
302                 global_cache_flush();
303                 mem->is_flushed = TRUE;
304         }
305
306         for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
307                 addr = (j * PAGE_SIZE) + agp_bridge->gart_bus_addr;
308                 cur_gatt = GET_GATT(addr);
309                 writel(agp_bridge->driver->mask_memory(agp_bridge,
310                         mem->memory[i], mem->type), cur_gatt+GET_GATT_OFF(addr));
311                 readl(cur_gatt+GET_GATT_OFF(addr));     /* PCI Posting. */
312         }
313         agp_bridge->driver->tlb_flush(mem);
314         return 0;
315 }
316
317 static int ati_remove_memory(struct agp_memory * mem, off_t pg_start,
318                              int type)
319 {
320         int i;
321         unsigned long __iomem *cur_gatt;
322         unsigned long addr;
323
324         if (type != 0 || mem->type != 0) {
325                 return -EINVAL;
326         }
327         for (i = pg_start; i < (mem->page_count + pg_start); i++) {
328                 addr = (i * PAGE_SIZE) + agp_bridge->gart_bus_addr;
329                 cur_gatt = GET_GATT(addr);
330                 writel(agp_bridge->scratch_page, cur_gatt+GET_GATT_OFF(addr));
331                 readl(cur_gatt+GET_GATT_OFF(addr)); /* PCI Posting. */
332         }
333
334         agp_bridge->driver->tlb_flush(mem);
335         return 0;
336 }
337
338 static int ati_create_gatt_table(struct agp_bridge_data *bridge)
339 {
340         struct aper_size_info_lvl2 *value;
341         ati_page_map page_dir;
342         unsigned long addr;
343         int retval;
344         u32 temp;
345         int i;
346         struct aper_size_info_lvl2 *current_size;
347
348         value = A_SIZE_LVL2(agp_bridge->current_size);
349         retval = ati_create_page_map(&page_dir);
350         if (retval != 0)
351                 return retval;
352
353         retval = ati_create_gatt_pages(value->num_entries / 1024);
354         if (retval != 0) {
355                 ati_free_page_map(&page_dir);
356                 return retval;
357         }
358
359         agp_bridge->gatt_table_real = (u32 *)page_dir.real;
360         agp_bridge->gatt_table = (u32 __iomem *) page_dir.remapped;
361         agp_bridge->gatt_bus_addr = virt_to_gart(page_dir.real);
362
363         /* Write out the size register */
364         current_size = A_SIZE_LVL2(agp_bridge->current_size);
365
366         if (is_r200()) {
367                 pci_read_config_dword(agp_bridge->dev, ATI_RS100_APSIZE, &temp);
368                 temp = (((temp & ~(0x0000000e)) | current_size->size_value)
369                         | 0x00000001);
370                 pci_write_config_dword(agp_bridge->dev, ATI_RS100_APSIZE, temp);
371                 pci_read_config_dword(agp_bridge->dev, ATI_RS100_APSIZE, &temp);
372         } else {
373                 pci_read_config_dword(agp_bridge->dev, ATI_RS300_APSIZE, &temp);
374                 temp = (((temp & ~(0x0000000e)) | current_size->size_value)
375                         | 0x00000001);
376                 pci_write_config_dword(agp_bridge->dev, ATI_RS300_APSIZE, temp);
377                 pci_read_config_dword(agp_bridge->dev, ATI_RS300_APSIZE, &temp);
378         }
379
380         /*
381          * Get the address for the gart region.
382          * This is a bus address even on the alpha, b/c its
383          * used to program the agp master not the cpu
384          */
385         pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &temp);
386         addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
387         agp_bridge->gart_bus_addr = addr;
388
389         /* Calculate the agp offset */
390         for(i = 0; i < value->num_entries / 1024; i++, addr += 0x00400000) {
391                 writel(virt_to_gart(ati_generic_private.gatt_pages[i]->real) | 1,
392                         page_dir.remapped+GET_PAGE_DIR_OFF(addr));
393                 readl(page_dir.remapped+GET_PAGE_DIR_OFF(addr));        /* PCI Posting. */
394         }
395
396         return 0;
397 }
398
399 static int ati_free_gatt_table(struct agp_bridge_data *bridge)
400 {
401         ati_page_map page_dir;
402
403         page_dir.real = (unsigned long *)agp_bridge->gatt_table_real;
404         page_dir.remapped = (unsigned long __iomem *)agp_bridge->gatt_table;
405
406         ati_free_gatt_pages();
407         ati_free_page_map(&page_dir);
408         return 0;
409 }
410
411 static struct agp_bridge_driver ati_generic_bridge = {
412         .owner                  = THIS_MODULE,
413         .aperture_sizes         = ati_generic_sizes,
414         .size_type              = LVL2_APER_SIZE,
415         .num_aperture_sizes     = 7,
416         .configure              = ati_configure,
417         .fetch_size             = ati_fetch_size,
418         .cleanup                = ati_cleanup,
419         .tlb_flush              = ati_tlbflush,
420         .mask_memory            = agp_generic_mask_memory,
421         .masks                  = ati_generic_masks,
422         .agp_enable             = agp_generic_enable,
423         .cache_flush            = global_cache_flush,
424         .create_gatt_table      = ati_create_gatt_table,
425         .free_gatt_table        = ati_free_gatt_table,
426         .insert_memory          = ati_insert_memory,
427         .remove_memory          = ati_remove_memory,
428         .alloc_by_type          = agp_generic_alloc_by_type,
429         .free_by_type           = agp_generic_free_by_type,
430         .agp_alloc_page         = agp_generic_alloc_page,
431         .agp_destroy_page       = agp_generic_destroy_page,
432 };
433
434
435 static struct agp_device_ids ati_agp_device_ids[] __devinitdata =
436 {
437         {
438                 .device_id      = PCI_DEVICE_ID_ATI_RS100,
439                 .chipset_name   = "IGP320/M",
440         },
441         {
442                 .device_id      = PCI_DEVICE_ID_ATI_RS200,
443                 .chipset_name   = "IGP330/340/345/350/M",
444         },
445         {
446                 .device_id      = PCI_DEVICE_ID_ATI_RS200_B,
447                 .chipset_name   = "IGP345M",
448         },
449         {
450                 .device_id      = PCI_DEVICE_ID_ATI_RS250,
451                 .chipset_name   = "IGP7000/M",
452         },
453         {
454                 .device_id      = PCI_DEVICE_ID_ATI_RS300_100,
455                 .chipset_name   = "IGP9100/M",
456         },
457         {
458                 .device_id      = PCI_DEVICE_ID_ATI_RS300_133,
459                 .chipset_name   = "IGP9100/M",
460         },
461         {
462                 .device_id      = PCI_DEVICE_ID_ATI_RS300_166,
463                 .chipset_name   = "IGP9100/M",
464         },
465         {
466                 .device_id      = PCI_DEVICE_ID_ATI_RS300_200,
467                 .chipset_name   = "IGP9100/M",
468         },
469         { }, /* dummy final entry, always present */
470 };
471
472 static int __devinit agp_ati_probe(struct pci_dev *pdev,
473                                    const struct pci_device_id *ent)
474 {
475         struct agp_device_ids *devs = ati_agp_device_ids;
476         struct agp_bridge_data *bridge;
477         u8 cap_ptr;
478         int j;
479
480         cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP);
481         if (!cap_ptr)
482                 return -ENODEV;
483
484         /* probe for known chipsets */
485         for (j = 0; devs[j].chipset_name; j++) {
486                 if (pdev->device == devs[j].device_id)
487                         goto found;
488         }
489
490         printk(KERN_ERR PFX
491              "Unsupported Ati chipset (device id: %04x)\n", pdev->device);
492         return -ENODEV;
493
494 found:
495         bridge = agp_alloc_bridge();
496         if (!bridge)
497                 return -ENOMEM;
498
499         bridge->dev = pdev;
500         bridge->capndx = cap_ptr;
501         
502         bridge->driver = &ati_generic_bridge;
503
504
505         printk(KERN_INFO PFX "Detected Ati %s chipset\n",
506                         devs[j].chipset_name);
507
508         /* Fill in the mode register */
509         pci_read_config_dword(pdev,
510                         bridge->capndx+PCI_AGP_STATUS,
511                         &bridge->mode);
512
513         pci_set_drvdata(pdev, bridge);
514         return agp_add_bridge(bridge);
515 }
516
517 static void __devexit agp_ati_remove(struct pci_dev *pdev)
518 {
519         struct agp_bridge_data *bridge = pci_get_drvdata(pdev);
520
521         agp_remove_bridge(bridge);
522         agp_put_bridge(bridge);
523 }
524
525 static struct pci_device_id agp_ati_pci_table[] = {
526         {
527         .class          = (PCI_CLASS_BRIDGE_HOST << 8),
528         .class_mask     = ~0,
529         .vendor         = PCI_VENDOR_ID_ATI,
530         .device         = PCI_ANY_ID,
531         .subvendor      = PCI_ANY_ID,
532         .subdevice      = PCI_ANY_ID,
533         },
534         { }
535 };
536
537 MODULE_DEVICE_TABLE(pci, agp_ati_pci_table);
538
539 static struct pci_driver agp_ati_pci_driver = {
540         .name           = "agpgart-ati",
541         .id_table       = agp_ati_pci_table,
542         .probe          = agp_ati_probe,
543         .remove         = agp_ati_remove,
544 #ifdef CONFIG_PM
545         .resume         = agp_ati_resume,
546         .suspend        = agp_ati_suspend,
547 #endif
548 };
549
550 static int __init agp_ati_init(void)
551 {
552         if (agp_off)
553                 return -EINVAL;
554         return pci_register_driver(&agp_ati_pci_driver);
555 }
556
557 static void __exit agp_ati_cleanup(void)
558 {
559         pci_unregister_driver(&agp_ati_pci_driver);
560 }
561
562 module_init(agp_ati_init);
563 module_exit(agp_ati_cleanup);
564
565 MODULE_AUTHOR("Dave Jones <davej@codemonkey.org.uk>");
566 MODULE_LICENSE("GPL and additional rights");
567