1 /*
2 * Transmeta's Efficeon AGPGART driver.
3 *
4 * Based upon a diff by Linus around November '02.
5 *
6 * Ported to the 2.6 kernel by Carlos Puchol <cpglinux@puchol.com>
7 * and H. Peter Anvin <hpa@transmeta.com>.
8 */
9
10 /*
11 * NOTE-cpg-040217:
12 *
13 * - when compiled as a module, after loading the module,
14 * it will refuse to unload, indicating it is in use,
15 * when it is not.
16 * - no s3 (suspend to ram) testing.
17 * - tested on the efficeon integrated nothbridge for tens
18 * of iterations of starting x and glxgears.
19 * - tested with radeon 9000 and radeon mobility m9 cards
20 * - tested with c3/c4 enabled (with the mobility m9 card)
21 */
22
23 #include <linux/module.h>
24 #include <linux/pci.h>
25 #include <linux/init.h>
26 #include <linux/agp_backend.h>
27 #include <linux/gfp.h>
28 #include <linux/page-flags.h>
29 #include <linux/mm.h>
30 #include "agp.h"
31 #include "intel-agp.h"
32
33 /*
34 * The real differences to the generic AGP code is
35 * in the GART mappings - a two-level setup with the
36 * first level being an on-chip 64-entry table.
37 *
38 * The page array is filled through the ATTPAGE register
39 * (Aperture Translation Table Page Register) at 0xB8. Bits:
40 * 31:20: physical page address
41 * 11:9: Page Attribute Table Index (PATI)
42 * must match the PAT index for the
43 * mapped pages (the 2nd level page table pages
44 * themselves should be just regular WB-cacheable,
45 * so this is normally zero.)
46 * 8: Present
47 * 7:6: reserved, write as zero
48 * 5:0: GATT directory index: which 1st-level entry
49 *
50 * The Efficeon AGP spec requires pages to be WB-cacheable
51 * but to be explicitly CLFLUSH'd after any changes.
52 */
53 #define EFFICEON_ATTPAGE 0xb8
54 #define EFFICEON_L1_SIZE 64 /* Number of PDE pages */
55
56 #define EFFICEON_PATI (0 << 9)
57 #define EFFICEON_PRESENT (1 << 8)
58
59 static struct _efficeon_private {
60 unsigned long l1_table[EFFICEON_L1_SIZE];
61 } efficeon_private;
62
63 static const struct gatt_mask efficeon_generic_masks[] =
64 {
65 {.mask = 0x00000001, .type = 0}
66 };
67
68 /* This function does the same thing as mask_memory() for this chipset... */
efficeon_mask_memory(struct page * page)69 static inline unsigned long efficeon_mask_memory(struct page *page)
70 {
71 unsigned long addr = page_to_phys(page);
72 return addr | 0x00000001;
73 }
74
75 static const struct aper_size_info_lvl2 efficeon_generic_sizes[4] =
76 {
77 {256, 65536, 0},
78 {128, 32768, 32},
79 {64, 16384, 48},
80 {32, 8192, 56}
81 };
82
83 /*
84 * Control interfaces are largely identical to
85 * the legacy Intel 440BX..
86 */
87
efficeon_fetch_size(void)88 static int efficeon_fetch_size(void)
89 {
90 int i;
91 u16 temp;
92 struct aper_size_info_lvl2 *values;
93
94 pci_read_config_word(agp_bridge->dev, INTEL_APSIZE, &temp);
95 values = A_SIZE_LVL2(agp_bridge->driver->aperture_sizes);
96
97 for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
98 if (temp == values[i].size_value) {
99 agp_bridge->previous_size =
100 agp_bridge->current_size = (void *) (values + i);
101 agp_bridge->aperture_size_idx = i;
102 return values[i].size;
103 }
104 }
105
106 return 0;
107 }
108
efficeon_tlbflush(struct agp_memory * mem)109 static void efficeon_tlbflush(struct agp_memory * mem)
110 {
111 printk(KERN_DEBUG PFX "efficeon_tlbflush()\n");
112 pci_write_config_dword(agp_bridge->dev, INTEL_AGPCTRL, 0x2200);
113 pci_write_config_dword(agp_bridge->dev, INTEL_AGPCTRL, 0x2280);
114 }
115
efficeon_cleanup(void)116 static void efficeon_cleanup(void)
117 {
118 u16 temp;
119 struct aper_size_info_lvl2 *previous_size;
120
121 printk(KERN_DEBUG PFX "efficeon_cleanup()\n");
122 previous_size = A_SIZE_LVL2(agp_bridge->previous_size);
123 pci_read_config_word(agp_bridge->dev, INTEL_NBXCFG, &temp);
124 pci_write_config_word(agp_bridge->dev, INTEL_NBXCFG, temp & ~(1 << 9));
125 pci_write_config_word(agp_bridge->dev, INTEL_APSIZE,
126 previous_size->size_value);
127 }
128
efficeon_configure(void)129 static int efficeon_configure(void)
130 {
131 u16 temp2;
132 struct aper_size_info_lvl2 *current_size;
133
134 printk(KERN_DEBUG PFX "efficeon_configure()\n");
135
136 current_size = A_SIZE_LVL2(agp_bridge->current_size);
137
138 /* aperture size */
139 pci_write_config_word(agp_bridge->dev, INTEL_APSIZE,
140 current_size->size_value);
141
142 /* address to map to */
143 agp_bridge->gart_bus_addr = pci_bus_address(agp_bridge->dev,
144 AGP_APERTURE_BAR);
145
146 /* agpctrl */
147 pci_write_config_dword(agp_bridge->dev, INTEL_AGPCTRL, 0x2280);
148
149 /* paccfg/nbxcfg */
150 pci_read_config_word(agp_bridge->dev, INTEL_NBXCFG, &temp2);
151 pci_write_config_word(agp_bridge->dev, INTEL_NBXCFG,
152 (temp2 & ~(1 << 10)) | (1 << 9) | (1 << 11));
153 /* clear any possible error conditions */
154 pci_write_config_byte(agp_bridge->dev, INTEL_ERRSTS + 1, 7);
155 return 0;
156 }
157
efficeon_free_gatt_table(struct agp_bridge_data * bridge)158 static int efficeon_free_gatt_table(struct agp_bridge_data *bridge)
159 {
160 int index, freed = 0;
161
162 for (index = 0; index < EFFICEON_L1_SIZE; index++) {
163 unsigned long page = efficeon_private.l1_table[index];
164 if (page) {
165 efficeon_private.l1_table[index] = 0;
166 free_page(page);
167 freed++;
168 }
169 printk(KERN_DEBUG PFX "efficeon_free_gatt_table(%p, %02x, %08x)\n",
170 agp_bridge->dev, EFFICEON_ATTPAGE, index);
171 pci_write_config_dword(agp_bridge->dev,
172 EFFICEON_ATTPAGE, index);
173 }
174 printk(KERN_DEBUG PFX "efficeon_free_gatt_table() freed %d pages\n", freed);
175 return 0;
176 }
177
178
179 /*
180 * Since we don't need contiguous memory we just try
181 * to get the gatt table once
182 */
183
184 #define GET_PAGE_DIR_OFF(addr) (addr >> 22)
185 #define GET_PAGE_DIR_IDX(addr) (GET_PAGE_DIR_OFF(addr) - \
186 GET_PAGE_DIR_OFF(agp_bridge->gart_bus_addr))
187 #define GET_GATT_OFF(addr) ((addr & 0x003ff000) >> 12)
188 #undef GET_GATT
189 #define GET_GATT(addr) (efficeon_private.gatt_pages[\
190 GET_PAGE_DIR_IDX(addr)]->remapped)
191
efficeon_create_gatt_table(struct agp_bridge_data * bridge)192 static int efficeon_create_gatt_table(struct agp_bridge_data *bridge)
193 {
194 int index;
195 const int pati = EFFICEON_PATI;
196 const int present = EFFICEON_PRESENT;
197 const int clflush_chunk = ((cpuid_ebx(1) >> 8) & 0xff) << 3;
198 int num_entries, l1_pages;
199
200 num_entries = A_SIZE_LVL2(agp_bridge->current_size)->num_entries;
201
202 printk(KERN_DEBUG PFX "efficeon_create_gatt_table(%d)\n", num_entries);
203
204 /* There are 2^10 PTE pages per PDE page */
205 BUG_ON(num_entries & 0x3ff);
206 l1_pages = num_entries >> 10;
207
208 for (index = 0 ; index < l1_pages ; index++) {
209 int offset;
210 unsigned long page;
211 unsigned long value;
212
213 page = efficeon_private.l1_table[index];
214 BUG_ON(page);
215
216 page = get_zeroed_page(GFP_KERNEL);
217 if (!page) {
218 efficeon_free_gatt_table(agp_bridge);
219 return -ENOMEM;
220 }
221
222 for (offset = 0; offset < PAGE_SIZE; offset += clflush_chunk)
223 clflush((char *)page+offset);
224
225 efficeon_private.l1_table[index] = page;
226
227 value = virt_to_phys((unsigned long *)page) | pati | present | index;
228
229 pci_write_config_dword(agp_bridge->dev,
230 EFFICEON_ATTPAGE, value);
231 }
232
233 return 0;
234 }
235
efficeon_insert_memory(struct agp_memory * mem,off_t pg_start,int type)236 static int efficeon_insert_memory(struct agp_memory * mem, off_t pg_start, int type)
237 {
238 int i, count = mem->page_count, num_entries;
239 unsigned int *page, *last_page;
240 const int clflush_chunk = ((cpuid_ebx(1) >> 8) & 0xff) << 3;
241 const unsigned long clflush_mask = ~(clflush_chunk-1);
242
243 printk(KERN_DEBUG PFX "efficeon_insert_memory(%lx, %d)\n", pg_start, count);
244
245 num_entries = A_SIZE_LVL2(agp_bridge->current_size)->num_entries;
246 if ((pg_start + mem->page_count) > num_entries)
247 return -EINVAL;
248 if (type != 0 || mem->type != 0)
249 return -EINVAL;
250
251 if (!mem->is_flushed) {
252 global_cache_flush();
253 mem->is_flushed = true;
254 }
255
256 last_page = NULL;
257 for (i = 0; i < count; i++) {
258 int index = pg_start + i;
259 unsigned long insert = efficeon_mask_memory(mem->pages[i]);
260
261 page = (unsigned int *) efficeon_private.l1_table[index >> 10];
262
263 if (!page)
264 continue;
265
266 page += (index & 0x3ff);
267 *page = insert;
268
269 /* clflush is slow, so don't clflush until we have to */
270 if (last_page &&
271 (((unsigned long)page^(unsigned long)last_page) &
272 clflush_mask))
273 clflush(last_page);
274
275 last_page = page;
276 }
277
278 if ( last_page )
279 clflush(last_page);
280
281 agp_bridge->driver->tlb_flush(mem);
282 return 0;
283 }
284
efficeon_remove_memory(struct agp_memory * mem,off_t pg_start,int type)285 static int efficeon_remove_memory(struct agp_memory * mem, off_t pg_start, int type)
286 {
287 int i, count = mem->page_count, num_entries;
288
289 printk(KERN_DEBUG PFX "efficeon_remove_memory(%lx, %d)\n", pg_start, count);
290
291 num_entries = A_SIZE_LVL2(agp_bridge->current_size)->num_entries;
292
293 if ((pg_start + mem->page_count) > num_entries)
294 return -EINVAL;
295 if (type != 0 || mem->type != 0)
296 return -EINVAL;
297
298 for (i = 0; i < count; i++) {
299 int index = pg_start + i;
300 unsigned int *page = (unsigned int *) efficeon_private.l1_table[index >> 10];
301
302 if (!page)
303 continue;
304 page += (index & 0x3ff);
305 *page = 0;
306 }
307 agp_bridge->driver->tlb_flush(mem);
308 return 0;
309 }
310
311
312 static const struct agp_bridge_driver efficeon_driver = {
313 .owner = THIS_MODULE,
314 .aperture_sizes = efficeon_generic_sizes,
315 .size_type = LVL2_APER_SIZE,
316 .num_aperture_sizes = 4,
317 .configure = efficeon_configure,
318 .fetch_size = efficeon_fetch_size,
319 .cleanup = efficeon_cleanup,
320 .tlb_flush = efficeon_tlbflush,
321 .mask_memory = agp_generic_mask_memory,
322 .masks = efficeon_generic_masks,
323 .agp_enable = agp_generic_enable,
324 .cache_flush = global_cache_flush,
325
326 // Efficeon-specific GATT table setup / populate / teardown
327 .create_gatt_table = efficeon_create_gatt_table,
328 .free_gatt_table = efficeon_free_gatt_table,
329 .insert_memory = efficeon_insert_memory,
330 .remove_memory = efficeon_remove_memory,
331 .cant_use_aperture = false, // true might be faster?
332
333 // Generic
334 .alloc_by_type = agp_generic_alloc_by_type,
335 .free_by_type = agp_generic_free_by_type,
336 .agp_alloc_page = agp_generic_alloc_page,
337 .agp_alloc_pages = agp_generic_alloc_pages,
338 .agp_destroy_page = agp_generic_destroy_page,
339 .agp_destroy_pages = agp_generic_destroy_pages,
340 .agp_type_to_mask_type = agp_generic_type_to_mask_type,
341 };
342
agp_efficeon_probe(struct pci_dev * pdev,const struct pci_device_id * ent)343 static int agp_efficeon_probe(struct pci_dev *pdev,
344 const struct pci_device_id *ent)
345 {
346 struct agp_bridge_data *bridge;
347 u8 cap_ptr;
348 struct resource *r;
349
350 cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP);
351 if (!cap_ptr)
352 return -ENODEV;
353
354 /* Probe for Efficeon controller */
355 if (pdev->device != PCI_DEVICE_ID_EFFICEON) {
356 printk(KERN_ERR PFX "Unsupported Efficeon chipset (device id: %04x)\n",
357 pdev->device);
358 return -ENODEV;
359 }
360
361 printk(KERN_INFO PFX "Detected Transmeta Efficeon TM8000 series chipset\n");
362
363 bridge = agp_alloc_bridge();
364 if (!bridge)
365 return -ENOMEM;
366
367 bridge->driver = &efficeon_driver;
368 bridge->dev = pdev;
369 bridge->capndx = cap_ptr;
370
371 /*
372 * If the device has not been properly setup, the following will catch
373 * the problem and should stop the system from crashing.
374 * 20030610 - hamish@zot.org
375 */
376 if (pci_enable_device(pdev)) {
377 printk(KERN_ERR PFX "Unable to Enable PCI device\n");
378 agp_put_bridge(bridge);
379 return -ENODEV;
380 }
381
382 /*
383 * The following fixes the case where the BIOS has "forgotten" to
384 * provide an address range for the GART.
385 * 20030610 - hamish@zot.org
386 */
387 r = &pdev->resource[0];
388 if (!r->start && r->end) {
389 if (pci_assign_resource(pdev, 0)) {
390 printk(KERN_ERR PFX "could not assign resource 0\n");
391 agp_put_bridge(bridge);
392 return -ENODEV;
393 }
394 }
395
396 /* Fill in the mode register */
397 if (cap_ptr) {
398 pci_read_config_dword(pdev,
399 bridge->capndx+PCI_AGP_STATUS,
400 &bridge->mode);
401 }
402
403 pci_set_drvdata(pdev, bridge);
404 return agp_add_bridge(bridge);
405 }
406
agp_efficeon_remove(struct pci_dev * pdev)407 static void agp_efficeon_remove(struct pci_dev *pdev)
408 {
409 struct agp_bridge_data *bridge = pci_get_drvdata(pdev);
410
411 agp_remove_bridge(bridge);
412 agp_put_bridge(bridge);
413 }
414
415 #ifdef CONFIG_PM
agp_efficeon_suspend(struct pci_dev * dev,pm_message_t state)416 static int agp_efficeon_suspend(struct pci_dev *dev, pm_message_t state)
417 {
418 return 0;
419 }
420
agp_efficeon_resume(struct pci_dev * pdev)421 static int agp_efficeon_resume(struct pci_dev *pdev)
422 {
423 printk(KERN_DEBUG PFX "agp_efficeon_resume()\n");
424 return efficeon_configure();
425 }
426 #endif
427
428 static const struct pci_device_id agp_efficeon_pci_table[] = {
429 {
430 .class = (PCI_CLASS_BRIDGE_HOST << 8),
431 .class_mask = ~0,
432 .vendor = PCI_VENDOR_ID_TRANSMETA,
433 .device = PCI_ANY_ID,
434 .subvendor = PCI_ANY_ID,
435 .subdevice = PCI_ANY_ID,
436 },
437 { }
438 };
439
440 MODULE_DEVICE_TABLE(pci, agp_efficeon_pci_table);
441
442 static struct pci_driver agp_efficeon_pci_driver = {
443 .name = "agpgart-efficeon",
444 .id_table = agp_efficeon_pci_table,
445 .probe = agp_efficeon_probe,
446 .remove = agp_efficeon_remove,
447 #ifdef CONFIG_PM
448 .suspend = agp_efficeon_suspend,
449 .resume = agp_efficeon_resume,
450 #endif
451 };
452
agp_efficeon_init(void)453 static int __init agp_efficeon_init(void)
454 {
455 static int agp_initialised=0;
456
457 if (agp_off)
458 return -EINVAL;
459
460 if (agp_initialised == 1)
461 return 0;
462 agp_initialised=1;
463
464 return pci_register_driver(&agp_efficeon_pci_driver);
465 }
466
agp_efficeon_cleanup(void)467 static void __exit agp_efficeon_cleanup(void)
468 {
469 pci_unregister_driver(&agp_efficeon_pci_driver);
470 }
471
472 module_init(agp_efficeon_init);
473 module_exit(agp_efficeon_cleanup);
474
475 MODULE_AUTHOR("Carlos Puchol <cpglinux@puchol.com>");
476 MODULE_LICENSE("GPL and additional rights");
477
