summaryrefslogtreecommitdiffstats
path: root/drivers/char/agp/sgi-agp.c
blob: 3a5af2f9b0152ad78d40e263cdf38d9276b7744b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2003-2005 Silicon Graphics, Inc.  All Rights Reserved.
 */

/*
 * SGI TIOCA AGPGART routines.
 *
 */

#include <linux/acpi.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/agp_backend.h>
#include <asm/sn/addrs.h>
#include <asm/sn/io.h>
#include <asm/sn/pcidev.h>
#include <asm/sn/pcibus_provider_defs.h>
#include <asm/sn/tioca_provider.h>
#include "agp.h"

extern int agp_memory_reserved;
extern uint32_t tioca_gart_found;
extern struct list_head tioca_list;
static struct agp_bridge_data **sgi_tioca_agp_bridges;

/*
 * The aperature size and related information is set up at TIOCA init time.
 * Values for this table will be extracted and filled in at
 * sgi_tioca_fetch_size() time.
 */

static struct aper_size_info_fixed sgi_tioca_sizes[] = {
	{0, 0, 0},
};

static struct page *sgi_tioca_alloc_page(struct agp_bridge_data *bridge)
{
	struct page *page;
	int nid;
	struct tioca_kernel *info =
	    (struct tioca_kernel *)bridge->dev_private_data;

	nid = info->ca_closest_node;
	page = alloc_pages_node(nid, GFP_KERNEL, 0);
	if (!page)
		return NULL;

	get_page(page);
	atomic_inc(&agp_bridge->current_memory_agp);
	return page;
}

/*
 * Flush GART tlb's.  Cannot selectively flush based on memory so the mem
 * arg is ignored.
 */

static void sgi_tioca_tlbflush(struct agp_memory *mem)
{
	tioca_tlbflush(mem->bridge->dev_private_data);
}

/*
 * Given an address of a host physical page, turn it into a valid gart
 * entry.
 */
static unsigned long
sgi_tioca_mask_memory(struct agp_bridge_data *bridge, dma_addr_t addr,
		      int type)
{
	return tioca_physpage_to_gart(addr);
}

static void sgi_tioca_agp_enable(struct agp_bridge_data *bridge, u32 mode)
{
	tioca_fastwrite_enable(bridge->dev_private_data);
}

/*
 * sgi_tioca_configure() doesn't have anything to do since the base CA driver
 * has alreay set up the GART.
 */

static int sgi_tioca_configure(void)
{
	return 0;
}

/*
 * Determine gfx aperature size.  This has already been determined by the
 * CA driver init, so just need to set agp_bridge values accordingly.
 */

static int sgi_tioca_fetch_size(void)
{
	struct tioca_kernel *info =
	    (struct tioca_kernel *)agp_bridge->dev_private_data;

	sgi_tioca_sizes[0].size = info->ca_gfxap_size / MB(1);
	sgi_tioca_sizes[0].num_entries = info->ca_gfxgart_entries;

	return sgi_tioca_sizes[0].size;
}

static int sgi_tioca_create_gatt_table(struct agp_bridge_data *bridge)
{
	struct tioca_kernel *info =
	    (struct tioca_kernel *)bridge->dev_private_data;

	bridge->gatt_table_real = (u32 *) info->ca_gfxgart;
	bridge->gatt_table = bridge->gatt_table_real;
	bridge->gatt_bus_addr = info->ca_gfxgart_base;

	return 0;
}

static int sgi_tioca_free_gatt_table(struct agp_bridge_data *bridge)
{
	return 0;
}

static int sgi_tioca_insert_memory(struct agp_memory *mem, off_t pg_start,
				   int type)
{
	int num_entries;
	size_t i;
	off_t j;
	void *temp;
	struct agp_bridge_data *bridge;
	u64 *table;

	bridge = mem->bridge;
	if (!bridge)
		return -EINVAL;

	table = (u64 *)bridge->gatt_table;

	temp = bridge->current_size;

	switch (bridge->driver->size_type) {
	case U8_APER_SIZE:
		num_entries = A_SIZE_8(temp)->num_entries;
		break;
	case U16_APER_SIZE:
		num_entries = A_SIZE_16(temp)->num_entries;
		break;
	case U32_APER_SIZE:
		num_entries = A_SIZE_32(temp)->num_entries;
		break;
	case FIXED_APER_SIZE:
		num_entries = A_SIZE_FIX(temp)->num_entries;
		break;
	case LVL2_APER_SIZE:
		return -EINVAL;
	default:
		num_entries = 0;
		break;
	}

	num_entries -= agp_memory_reserved / PAGE_SIZE;
	if (num_entries < 0)
		num_entries = 0;

	if (type != 0 || mem->type != 0) {
		return -EINVAL;
	}

	if ((pg_start + mem->page_count) > num_entries)
		return -EINVAL;

	j = pg_start;

	while (j < (pg_start + mem->page_count)) {
		if (table[j])
			return -EBUSY;
		j++;
	}

	if (!mem->is_flushed) {
		bridge->driver->cache_flush();
		mem->is_flushed = true;
	}

	for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
		table[j] =
		    bridge->driver->mask_memory(bridge,
						page_to_phys(mem->pages[i]),
						mem->type);
	}

	bridge->driver->tlb_flush(mem);
	return 0;
}

static int sgi_tioca_remove_memory(struct agp_memory *mem, off_t pg_start,
				   int type)
{
	size_t i;
	struct agp_bridge_data *bridge;
	u64 *table;

	bridge = mem->bridge;
	if (!bridge)
		return -EINVAL;

	if (type != 0 || mem->type != 0) {
		return -EINVAL;
	}

	table = (u64 *)bridge->gatt_table;

	for (i = pg_start; i < (mem->page_count + pg_start); i++) {
		table[i] = 0;
	}

	bridge->driver->tlb_flush(mem);
	return 0;
}

static void sgi_tioca_cache_flush(void)
{
}

/*
 * Cleanup.  Nothing to do as the CA driver owns the GART.
 */

static void sgi_tioca_cleanup(void)
{
}

static struct agp_bridge_data *sgi_tioca_find_bridge(struct pci_dev *pdev)
{
	struct agp_bridge_data *bridge;

	list_for_each_entry(bridge, &agp_bridges, list) {
		if (bridge->dev->bus == pdev->bus)
			break;
	}
	return bridge;
}

const struct agp_bridge_driver sgi_tioca_driver = {
	.owner = THIS_MODULE,
	.size_type = U16_APER_SIZE,
	.configure = sgi_tioca_configure,
	.fetch_size = sgi_tioca_fetch_size,
	.cleanup = sgi_tioca_cleanup,
	.tlb_flush = sgi_tioca_tlbflush,
	.mask_memory = sgi_tioca_mask_memory,
	.agp_enable = sgi_tioca_agp_enable,
	.cache_flush = sgi_tioca_cache_flush,
	.create_gatt_table = sgi_tioca_create_gatt_table,
	.free_gatt_table = sgi_tioca_free_gatt_table,
	.insert_memory = sgi_tioca_insert_memory,
	.remove_memory = sgi_tioca_remove_memory,
	.alloc_by_type = agp_generic_alloc_by_type,
	.free_by_type = agp_generic_free_by_type,
	.agp_alloc_page = sgi_tioca_alloc_page,
	.agp_destroy_page = agp_generic_destroy_page,
	.agp_type_to_mask_type  = agp_generic_type_to_mask_type,
	.cant_use_aperture = true,
	.needs_scratch_page = false,
	.num_aperture_sizes = 1,
};

static int __devinit agp_sgi_init(void)
{
	unsigned int j;
	struct tioca_kernel *info;
	struct pci_dev *pdev = NULL;

	if (tioca_gart_found)
		printk(KERN_INFO PFX "SGI TIO CA GART driver initialized.\n");
	else
		return 0;

	sgi_tioca_agp_bridges = kmalloc(tioca_gart_found *
					sizeof(struct agp_bridge_data *),
					GFP_KERNEL);
	if (!sgi_tioca_agp_bridges)
		return -ENOMEM;

	j = 0;
	list_for_each_entry(info, &tioca_list, ca_list) {
		if (list_empty(info->ca_devices))
			continue;
		list_for_each_entry(pdev, info->ca_devices, bus_list) {
			u8 cap_ptr;

			if (pdev->class != (PCI_CLASS_DISPLAY_VGA << 8))
				continue;
			cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP);
			if (!cap_ptr)
				continue;
		}
		sgi_tioca_agp_bridges[j] = agp_alloc_bridge();
		printk(KERN_INFO PFX "bridge %d = 0x%p\n", j,
		       sgi_tioca_agp_bridges[j]);
		if (sgi_tioca_agp_bridges[j]) {
			sgi_tioca_agp_bridges[j]->dev = pdev;
			sgi_tioca_agp_bridges[j]->dev_private_data = info;
			sgi_tioca_agp_bridges[j]->driver = &sgi_tioca_driver;
			sgi_tioca_agp_bridges[j]->gart_bus_addr =
			    info->ca_gfxap_base;
			sgi_tioca_agp_bridges[j]->mode = (0x7D << 24) |	/* 126 requests */
			    (0x1 << 9) |	/* SBA supported */
			    (0x1 << 5) |	/* 64-bit addresses supported */
			    (0x1 << 4) |	/* FW supported */
			    (0x1 << 3) |	/* AGP 3.0 mode */
			    0x2;	/* 8x transfer only */
			sgi_tioca_agp_bridges[j]->current_size =
			    sgi_tioca_agp_bridges[j]->previous_size =
			    (void *)&sgi_tioca_sizes[0];
			agp_add_bridge(sgi_tioca_agp_bridges[j]);
		}
		j++;
	}

	agp_find_bridge = &sgi_tioca_find_bridge;
	return 0;
}

static void __devexit agp_sgi_cleanup(void)
{
	kfree(sgi_tioca_agp_bridges);
	sgi_tioca_agp_bridges = NULL;
}

module_init(agp_sgi_init);
module_exit(agp_sgi_cleanup);

MODULE_LICENSE("GPL and additional rights");