xref: /openbmc/linux/drivers/char/agp/ati-agp.c (revision 6a1274ea)
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 <asm/set_memory.h>
14 #include "agp.h"
15 
16 #define ATI_GART_MMBASE_BAR	1
17 #define ATI_RS100_APSIZE	0xac
18 #define ATI_RS100_IG_AGPMODE	0xb0
19 #define ATI_RS300_APSIZE	0xf8
20 #define ATI_RS300_IG_AGPMODE	0xfc
21 #define ATI_GART_FEATURE_ID		0x00
22 #define ATI_GART_BASE			0x04
23 #define ATI_GART_CACHE_SZBASE		0x08
24 #define ATI_GART_CACHE_CNTRL		0x0c
25 #define ATI_GART_CACHE_ENTRY_CNTRL	0x10
26 
27 
28 static const struct aper_size_info_lvl2 ati_generic_sizes[7] =
29 {
30 	{2048, 524288, 0x0000000c},
31 	{1024, 262144, 0x0000000a},
32 	{512, 131072, 0x00000008},
33 	{256, 65536, 0x00000006},
34 	{128, 32768, 0x00000004},
35 	{64, 16384, 0x00000002},
36 	{32, 8192, 0x00000000}
37 };
38 
39 static struct gatt_mask ati_generic_masks[] =
40 {
41 	{ .mask = 1, .type = 0}
42 };
43 
44 
45 struct ati_page_map {
46 	unsigned long *real;
47 	unsigned long __iomem *remapped;
48 };
49 
50 static struct _ati_generic_private {
51 	volatile u8 __iomem *registers;
52 	struct ati_page_map **gatt_pages;
53 	int num_tables;
54 } ati_generic_private;
55 
ati_create_page_map(struct ati_page_map * page_map)56 static int ati_create_page_map(struct ati_page_map *page_map)
57 {
58 	int i, err;
59 
60 	page_map->real = (unsigned long *) __get_free_page(GFP_KERNEL);
61 	if (page_map->real == NULL)
62 		return -ENOMEM;
63 
64 	set_memory_uc((unsigned long)page_map->real, 1);
65 	err = map_page_into_agp(virt_to_page(page_map->real));
66 	if (err) {
67 		free_page((unsigned long)page_map->real);
68 		return err;
69 	}
70 	page_map->remapped = page_map->real;
71 
72 	for (i = 0; i < PAGE_SIZE / sizeof(unsigned long); i++) {
73 		writel(agp_bridge->scratch_page, page_map->remapped+i);
74 		readl(page_map->remapped+i);	/* PCI Posting. */
75 	}
76 
77 	return 0;
78 }
79 
80 
ati_free_page_map(struct ati_page_map * page_map)81 static void ati_free_page_map(struct ati_page_map *page_map)
82 {
83 	unmap_page_from_agp(virt_to_page(page_map->real));
84 	set_memory_wb((unsigned long)page_map->real, 1);
85 	free_page((unsigned long) page_map->real);
86 }
87 
88 
ati_free_gatt_pages(void)89 static void ati_free_gatt_pages(void)
90 {
91 	int i;
92 	struct ati_page_map **tables;
93 	struct ati_page_map *entry;
94 
95 	tables = ati_generic_private.gatt_pages;
96 	for (i = 0; i < ati_generic_private.num_tables; i++) {
97 		entry = tables[i];
98 		if (entry != NULL) {
99 			if (entry->real != NULL)
100 				ati_free_page_map(entry);
101 			kfree(entry);
102 		}
103 	}
104 	kfree(tables);
105 }
106 
107 
ati_create_gatt_pages(int nr_tables)108 static int ati_create_gatt_pages(int nr_tables)
109 {
110 	struct ati_page_map **tables;
111 	struct ati_page_map *entry;
112 	int retval = 0;
113 	int i;
114 
115 	tables = kcalloc(nr_tables + 1, sizeof(struct ati_page_map *),
116 			 GFP_KERNEL);
117 	if (tables == NULL)
118 		return -ENOMEM;
119 
120 	for (i = 0; i < nr_tables; i++) {
121 		entry = kzalloc(sizeof(struct ati_page_map), GFP_KERNEL);
122 		tables[i] = entry;
123 		if (entry == NULL) {
124 			retval = -ENOMEM;
125 			break;
126 		}
127 		retval = ati_create_page_map(entry);
128 		if (retval != 0)
129 			break;
130 	}
131 	ati_generic_private.num_tables = i;
132 	ati_generic_private.gatt_pages = tables;
133 
134 	if (retval != 0)
135 		ati_free_gatt_pages();
136 
137 	return retval;
138 }
139 
is_r200(void)140 static int is_r200(void)
141 {
142 	if ((agp_bridge->dev->device == PCI_DEVICE_ID_ATI_RS100) ||
143 	    (agp_bridge->dev->device == PCI_DEVICE_ID_ATI_RS200) ||
144 	    (agp_bridge->dev->device == PCI_DEVICE_ID_ATI_RS200_B) ||
145 	    (agp_bridge->dev->device == PCI_DEVICE_ID_ATI_RS250))
146 		return 1;
147 	return 0;
148 }
149 
ati_fetch_size(void)150 static int ati_fetch_size(void)
151 {
152 	int i;
153 	u32 temp;
154 	struct aper_size_info_lvl2 *values;
155 
156 	if (is_r200())
157 		pci_read_config_dword(agp_bridge->dev, ATI_RS100_APSIZE, &temp);
158 	else
159 		pci_read_config_dword(agp_bridge->dev, ATI_RS300_APSIZE, &temp);
160 
161 	temp = (temp & 0x0000000e);
162 	values = A_SIZE_LVL2(agp_bridge->driver->aperture_sizes);
163 	for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
164 		if (temp == values[i].size_value) {
165 			agp_bridge->previous_size =
166 			    agp_bridge->current_size = (void *) (values + i);
167 
168 			agp_bridge->aperture_size_idx = i;
169 			return values[i].size;
170 		}
171 	}
172 
173 	return 0;
174 }
175 
ati_tlbflush(struct agp_memory * mem)176 static void ati_tlbflush(struct agp_memory * mem)
177 {
178 	writel(1, ati_generic_private.registers+ATI_GART_CACHE_CNTRL);
179 	readl(ati_generic_private.registers+ATI_GART_CACHE_CNTRL);	/* PCI Posting. */
180 }
181 
ati_cleanup(void)182 static void ati_cleanup(void)
183 {
184 	struct aper_size_info_lvl2 *previous_size;
185 	u32 temp;
186 
187 	previous_size = A_SIZE_LVL2(agp_bridge->previous_size);
188 
189 	/* Write back the previous size and disable gart translation */
190 	if (is_r200()) {
191 		pci_read_config_dword(agp_bridge->dev, ATI_RS100_APSIZE, &temp);
192 		temp = ((temp & ~(0x0000000f)) | previous_size->size_value);
193 		pci_write_config_dword(agp_bridge->dev, ATI_RS100_APSIZE, temp);
194 	} else {
195 		pci_read_config_dword(agp_bridge->dev, ATI_RS300_APSIZE, &temp);
196 		temp = ((temp & ~(0x0000000f)) | previous_size->size_value);
197 		pci_write_config_dword(agp_bridge->dev, ATI_RS300_APSIZE, temp);
198 	}
199 	iounmap((volatile u8 __iomem *)ati_generic_private.registers);
200 }
201 
202 
ati_configure(void)203 static int ati_configure(void)
204 {
205 	phys_addr_t reg;
206 	u32 temp;
207 
208 	/* Get the memory mapped registers */
209 	reg = pci_resource_start(agp_bridge->dev, ATI_GART_MMBASE_BAR);
210 	ati_generic_private.registers = (volatile u8 __iomem *) ioremap(reg, 4096);
211 
212 	if (!ati_generic_private.registers)
213 		return -ENOMEM;
214 
215 	if (is_r200())
216 		pci_write_config_dword(agp_bridge->dev, ATI_RS100_IG_AGPMODE, 0x20000);
217 	else
218 		pci_write_config_dword(agp_bridge->dev, ATI_RS300_IG_AGPMODE, 0x20000);
219 
220 	/* address to map to */
221 	/*
222 	agp_bridge.gart_bus_addr = pci_bus_address(agp_bridge.dev,
223 						   AGP_APERTURE_BAR);
224 	printk(KERN_INFO PFX "IGP320 gart_bus_addr: %x\n", agp_bridge.gart_bus_addr);
225 	*/
226 	writel(0x60000, ati_generic_private.registers+ATI_GART_FEATURE_ID);
227 	readl(ati_generic_private.registers+ATI_GART_FEATURE_ID);	/* PCI Posting.*/
228 
229 	/* SIGNALED_SYSTEM_ERROR @ NB_STATUS */
230 	pci_read_config_dword(agp_bridge->dev, PCI_COMMAND, &temp);
231 	pci_write_config_dword(agp_bridge->dev, PCI_COMMAND, temp | (1<<14));
232 
233 	/* Write out the address of the gatt table */
234 	writel(agp_bridge->gatt_bus_addr, ati_generic_private.registers+ATI_GART_BASE);
235 	readl(ati_generic_private.registers+ATI_GART_BASE);	/* PCI Posting. */
236 
237 	return 0;
238 }
239 
240 
agp_ati_resume(struct device * dev)241 static int agp_ati_resume(struct device *dev)
242 {
243 	return ati_configure();
244 }
245 
246 /*
247  *Since we don't need contiguous memory we just try
248  * to get the gatt table once
249  */
250 
251 #define GET_PAGE_DIR_OFF(addr) (addr >> 22)
252 #define GET_PAGE_DIR_IDX(addr) (GET_PAGE_DIR_OFF(addr) - \
253 	GET_PAGE_DIR_OFF(agp_bridge->gart_bus_addr))
254 #define GET_GATT_OFF(addr) ((addr & 0x003ff000) >> 12)
255 #undef  GET_GATT
256 #define GET_GATT(addr) (ati_generic_private.gatt_pages[\
257 	GET_PAGE_DIR_IDX(addr)]->remapped)
258 
ati_insert_memory(struct agp_memory * mem,off_t pg_start,int type)259 static int ati_insert_memory(struct agp_memory * mem,
260 			     off_t pg_start, int type)
261 {
262 	int i, j, num_entries;
263 	unsigned long __iomem *cur_gatt;
264 	unsigned long addr;
265 	int mask_type;
266 
267 	num_entries = A_SIZE_LVL2(agp_bridge->current_size)->num_entries;
268 
269 	mask_type = agp_generic_type_to_mask_type(mem->bridge, type);
270 	if (mask_type != 0 || type != mem->type)
271 		return -EINVAL;
272 
273 	if (mem->page_count == 0)
274 		return 0;
275 
276 	if ((pg_start + mem->page_count) > num_entries)
277 		return -EINVAL;
278 
279 	j = pg_start;
280 	while (j < (pg_start + mem->page_count)) {
281 		addr = (j * PAGE_SIZE) + agp_bridge->gart_bus_addr;
282 		cur_gatt = GET_GATT(addr);
283 		if (!PGE_EMPTY(agp_bridge,readl(cur_gatt+GET_GATT_OFF(addr))))
284 			return -EBUSY;
285 		j++;
286 	}
287 
288 	if (!mem->is_flushed) {
289 		/*CACHE_FLUSH(); */
290 		global_cache_flush();
291 		mem->is_flushed = true;
292 	}
293 
294 	for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
295 		addr = (j * PAGE_SIZE) + agp_bridge->gart_bus_addr;
296 		cur_gatt = GET_GATT(addr);
297 		writel(agp_bridge->driver->mask_memory(agp_bridge,
298 						       page_to_phys(mem->pages[i]),
299 						       mem->type),
300 		       cur_gatt+GET_GATT_OFF(addr));
301 	}
302 	readl(GET_GATT(agp_bridge->gart_bus_addr)); /* PCI posting */
303 	agp_bridge->driver->tlb_flush(mem);
304 	return 0;
305 }
306 
ati_remove_memory(struct agp_memory * mem,off_t pg_start,int type)307 static int ati_remove_memory(struct agp_memory * mem, off_t pg_start,
308 			     int type)
309 {
310 	int i;
311 	unsigned long __iomem *cur_gatt;
312 	unsigned long addr;
313 	int mask_type;
314 
315 	mask_type = agp_generic_type_to_mask_type(mem->bridge, type);
316 	if (mask_type != 0 || type != mem->type)
317 		return -EINVAL;
318 
319 	if (mem->page_count == 0)
320 		return 0;
321 
322 	for (i = pg_start; i < (mem->page_count + pg_start); i++) {
323 		addr = (i * PAGE_SIZE) + agp_bridge->gart_bus_addr;
324 		cur_gatt = GET_GATT(addr);
325 		writel(agp_bridge->scratch_page, cur_gatt+GET_GATT_OFF(addr));
326 	}
327 
328 	readl(GET_GATT(agp_bridge->gart_bus_addr)); /* PCI posting */
329 	agp_bridge->driver->tlb_flush(mem);
330 	return 0;
331 }
332 
ati_create_gatt_table(struct agp_bridge_data * bridge)333 static int ati_create_gatt_table(struct agp_bridge_data *bridge)
334 {
335 	struct aper_size_info_lvl2 *value;
336 	struct ati_page_map page_dir;
337 	unsigned long __iomem *cur_gatt;
338 	unsigned long addr;
339 	int retval;
340 	u32 temp;
341 	int i;
342 	struct aper_size_info_lvl2 *current_size;
343 
344 	value = A_SIZE_LVL2(agp_bridge->current_size);
345 	retval = ati_create_page_map(&page_dir);
346 	if (retval != 0)
347 		return retval;
348 
349 	retval = ati_create_gatt_pages(value->num_entries / 1024);
350 	if (retval != 0) {
351 		ati_free_page_map(&page_dir);
352 		return retval;
353 	}
354 
355 	agp_bridge->gatt_table_real = (u32 *)page_dir.real;
356 	agp_bridge->gatt_table = (u32 __iomem *) page_dir.remapped;
357 	agp_bridge->gatt_bus_addr = virt_to_phys(page_dir.real);
358 
359 	/* Write out the size register */
360 	current_size = A_SIZE_LVL2(agp_bridge->current_size);
361 
362 	if (is_r200()) {
363 		pci_read_config_dword(agp_bridge->dev, ATI_RS100_APSIZE, &temp);
364 		temp = (((temp & ~(0x0000000e)) | current_size->size_value)
365 			| 0x00000001);
366 		pci_write_config_dword(agp_bridge->dev, ATI_RS100_APSIZE, temp);
367 		pci_read_config_dword(agp_bridge->dev, ATI_RS100_APSIZE, &temp);
368 	} else {
369 		pci_read_config_dword(agp_bridge->dev, ATI_RS300_APSIZE, &temp);
370 		temp = (((temp & ~(0x0000000e)) | current_size->size_value)
371 			| 0x00000001);
372 		pci_write_config_dword(agp_bridge->dev, ATI_RS300_APSIZE, temp);
373 		pci_read_config_dword(agp_bridge->dev, ATI_RS300_APSIZE, &temp);
374 	}
375 
376 	/*
377 	 * Get the address for the gart region.
378 	 * This is a bus address even on the alpha, b/c its
379 	 * used to program the agp master not the cpu
380 	 */
381 	addr = pci_bus_address(agp_bridge->dev, AGP_APERTURE_BAR);
382 	agp_bridge->gart_bus_addr = addr;
383 
384 	/* Calculate the agp offset */
385 	for (i = 0; i < value->num_entries / 1024; i++, addr += 0x00400000) {
386 		writel(virt_to_phys(ati_generic_private.gatt_pages[i]->real) | 1,
387 			page_dir.remapped+GET_PAGE_DIR_OFF(addr));
388 		readl(page_dir.remapped+GET_PAGE_DIR_OFF(addr));	/* PCI Posting. */
389 	}
390 
391 	for (i = 0; i < value->num_entries; i++) {
392 		addr = (i * PAGE_SIZE) + agp_bridge->gart_bus_addr;
393 		cur_gatt = GET_GATT(addr);
394 		writel(agp_bridge->scratch_page, cur_gatt+GET_GATT_OFF(addr));
395 	}
396 
397 	return 0;
398 }
399 
ati_free_gatt_table(struct agp_bridge_data * bridge)400 static int ati_free_gatt_table(struct agp_bridge_data *bridge)
401 {
402 	struct ati_page_map page_dir;
403 
404 	page_dir.real = (unsigned long *)agp_bridge->gatt_table_real;
405 	page_dir.remapped = (unsigned long __iomem *)agp_bridge->gatt_table;
406 
407 	ati_free_gatt_pages();
408 	ati_free_page_map(&page_dir);
409 	return 0;
410 }
411 
412 static const struct agp_bridge_driver ati_generic_bridge = {
413 	.owner			= THIS_MODULE,
414 	.aperture_sizes		= ati_generic_sizes,
415 	.size_type		= LVL2_APER_SIZE,
416 	.num_aperture_sizes	= 7,
417 	.needs_scratch_page	= true,
418 	.configure		= ati_configure,
419 	.fetch_size		= ati_fetch_size,
420 	.cleanup		= ati_cleanup,
421 	.tlb_flush		= ati_tlbflush,
422 	.mask_memory		= agp_generic_mask_memory,
423 	.masks			= ati_generic_masks,
424 	.agp_enable		= agp_generic_enable,
425 	.cache_flush		= global_cache_flush,
426 	.create_gatt_table	= ati_create_gatt_table,
427 	.free_gatt_table	= ati_free_gatt_table,
428 	.insert_memory		= ati_insert_memory,
429 	.remove_memory		= ati_remove_memory,
430 	.alloc_by_type		= agp_generic_alloc_by_type,
431 	.free_by_type		= agp_generic_free_by_type,
432 	.agp_alloc_page		= agp_generic_alloc_page,
433 	.agp_alloc_pages	= agp_generic_alloc_pages,
434 	.agp_destroy_page	= agp_generic_destroy_page,
435 	.agp_destroy_pages	= agp_generic_destroy_pages,
436 	.agp_type_to_mask_type  = agp_generic_type_to_mask_type,
437 };
438 
439 
440 static struct agp_device_ids ati_agp_device_ids[] =
441 {
442 	{
443 		.device_id	= PCI_DEVICE_ID_ATI_RS100,
444 		.chipset_name	= "IGP320/M",
445 	},
446 	{
447 		.device_id	= PCI_DEVICE_ID_ATI_RS200,
448 		.chipset_name	= "IGP330/340/345/350/M",
449 	},
450 	{
451 		.device_id	= PCI_DEVICE_ID_ATI_RS200_B,
452 		.chipset_name	= "IGP345M",
453 	},
454 	{
455 		.device_id	= PCI_DEVICE_ID_ATI_RS250,
456 		.chipset_name	= "IGP7000/M",
457 	},
458 	{
459 		.device_id	= PCI_DEVICE_ID_ATI_RS300_100,
460 		.chipset_name	= "IGP9100/M",
461 	},
462 	{
463 		.device_id	= PCI_DEVICE_ID_ATI_RS300_133,
464 		.chipset_name	= "IGP9100/M",
465 	},
466 	{
467 		.device_id	= PCI_DEVICE_ID_ATI_RS300_166,
468 		.chipset_name	= "IGP9100/M",
469 	},
470 	{
471 		.device_id	= PCI_DEVICE_ID_ATI_RS300_200,
472 		.chipset_name	= "IGP9100/M",
473 	},
474 	{
475 		.device_id	= PCI_DEVICE_ID_ATI_RS350_133,
476 		.chipset_name	= "IGP9000/M",
477 	},
478 	{
479 		.device_id	= PCI_DEVICE_ID_ATI_RS350_200,
480 		.chipset_name	= "IGP9100/M",
481 	},
482 	{ }, /* dummy final entry, always present */
483 };
484 
agp_ati_probe(struct pci_dev * pdev,const struct pci_device_id * ent)485 static int agp_ati_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
486 {
487 	struct agp_device_ids *devs = ati_agp_device_ids;
488 	struct agp_bridge_data *bridge;
489 	u8 cap_ptr;
490 	int j;
491 
492 	cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP);
493 	if (!cap_ptr)
494 		return -ENODEV;
495 
496 	/* probe for known chipsets */
497 	for (j = 0; devs[j].chipset_name; j++) {
498 		if (pdev->device == devs[j].device_id)
499 			goto found;
500 	}
501 
502 	dev_err(&pdev->dev, "unsupported Ati chipset [%04x/%04x])\n",
503 		pdev->vendor, pdev->device);
504 	return -ENODEV;
505 
506 found:
507 	bridge = agp_alloc_bridge();
508 	if (!bridge)
509 		return -ENOMEM;
510 
511 	bridge->dev = pdev;
512 	bridge->capndx = cap_ptr;
513 
514 	bridge->driver = &ati_generic_bridge;
515 
516 	dev_info(&pdev->dev, "Ati %s chipset\n", devs[j].chipset_name);
517 
518 	/* Fill in the mode register */
519 	pci_read_config_dword(pdev,
520 			bridge->capndx+PCI_AGP_STATUS,
521 			&bridge->mode);
522 
523 	pci_set_drvdata(pdev, bridge);
524 	return agp_add_bridge(bridge);
525 }
526 
agp_ati_remove(struct pci_dev * pdev)527 static void agp_ati_remove(struct pci_dev *pdev)
528 {
529 	struct agp_bridge_data *bridge = pci_get_drvdata(pdev);
530 
531 	agp_remove_bridge(bridge);
532 	agp_put_bridge(bridge);
533 }
534 
535 static const struct pci_device_id agp_ati_pci_table[] = {
536 	{
537 	.class		= (PCI_CLASS_BRIDGE_HOST << 8),
538 	.class_mask	= ~0,
539 	.vendor		= PCI_VENDOR_ID_ATI,
540 	.device		= PCI_ANY_ID,
541 	.subvendor	= PCI_ANY_ID,
542 	.subdevice	= PCI_ANY_ID,
543 	},
544 	{ }
545 };
546 
547 MODULE_DEVICE_TABLE(pci, agp_ati_pci_table);
548 
549 static DEFINE_SIMPLE_DEV_PM_OPS(agp_ati_pm_ops, NULL, agp_ati_resume);
550 
551 static struct pci_driver agp_ati_pci_driver = {
552 	.name		= "agpgart-ati",
553 	.id_table	= agp_ati_pci_table,
554 	.probe		= agp_ati_probe,
555 	.remove		= agp_ati_remove,
556 	.driver.pm	= &agp_ati_pm_ops,
557 };
558 
agp_ati_init(void)559 static int __init agp_ati_init(void)
560 {
561 	if (agp_off)
562 		return -EINVAL;
563 	return pci_register_driver(&agp_ati_pci_driver);
564 }
565 
agp_ati_cleanup(void)566 static void __exit agp_ati_cleanup(void)
567 {
568 	pci_unregister_driver(&agp_ati_pci_driver);
569 }
570 
571 module_init(agp_ati_init);
572 module_exit(agp_ati_cleanup);
573 
574 MODULE_AUTHOR("Dave Jones");
575 MODULE_LICENSE("GPL and additional rights");
576 
577