aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/char/drm/via_ds.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/char/drm/via_ds.c')
-rw-r--r--drivers/char/drm/via_ds.c280
1 files changed, 280 insertions, 0 deletions
diff --git a/drivers/char/drm/via_ds.c b/drivers/char/drm/via_ds.c
new file mode 100644
index 000000000000..daf3df75a20e
--- /dev/null
+++ b/drivers/char/drm/via_ds.c
@@ -0,0 +1,280 @@
1/*
2 * Copyright 1998-2003 VIA Technologies, Inc. All Rights Reserved.
3 * Copyright 2001-2003 S3 Graphics, Inc. All Rights Reserved.
4 * Copyright 2000 Silicon Integrated Systems Corp, Inc., HsinChu, Taiwan.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sub license,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice (including the
14 * next paragraph) shall be included in all copies or substantial portions
15 * of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
20 * VIA, S3 GRAPHICS, AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
21 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
22 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
23 * DEALINGS IN THE SOFTWARE.
24 */
25#include <linux/module.h>
26#include <linux/delay.h>
27#include <linux/errno.h>
28#include <linux/kernel.h>
29#include <linux/slab.h>
30#include <linux/poll.h>
31#include <linux/pci.h>
32#include <asm/io.h>
33
34#include "via_ds.h"
35extern unsigned int VIA_DEBUG;
36
37set_t *via_setInit(void)
38{
39 int i;
40 set_t *set;
41 set = (set_t *) drm_alloc(sizeof(set_t), DRM_MEM_DRIVER);
42 for (i = 0; i < SET_SIZE; i++) {
43 set->list[i].free_next = i + 1;
44 set->list[i].alloc_next = -1;
45 }
46 set->list[SET_SIZE - 1].free_next = -1;
47 set->free = 0;
48 set->alloc = -1;
49 set->trace = -1;
50 return set;
51}
52
53int via_setAdd(set_t * set, ITEM_TYPE item)
54{
55 int free = set->free;
56 if (free != -1) {
57 set->list[free].val = item;
58 set->free = set->list[free].free_next;
59 } else {
60 return 0;
61 }
62 set->list[free].alloc_next = set->alloc;
63 set->alloc = free;
64 set->list[free].free_next = -1;
65 return 1;
66}
67
68int via_setDel(set_t * set, ITEM_TYPE item)
69{
70 int alloc = set->alloc;
71 int prev = -1;
72
73 while (alloc != -1) {
74 if (set->list[alloc].val == item) {
75 if (prev != -1)
76 set->list[prev].alloc_next =
77 set->list[alloc].alloc_next;
78 else
79 set->alloc = set->list[alloc].alloc_next;
80 break;
81 }
82 prev = alloc;
83 alloc = set->list[alloc].alloc_next;
84 }
85
86 if (alloc == -1)
87 return 0;
88
89 set->list[alloc].free_next = set->free;
90 set->free = alloc;
91 set->list[alloc].alloc_next = -1;
92
93 return 1;
94}
95
96/* setFirst -> setAdd -> setNext is wrong */
97
98int via_setFirst(set_t * set, ITEM_TYPE * item)
99{
100 if (set->alloc == -1)
101 return 0;
102
103 *item = set->list[set->alloc].val;
104 set->trace = set->list[set->alloc].alloc_next;
105
106 return 1;
107}
108
109int via_setNext(set_t * set, ITEM_TYPE * item)
110{
111 if (set->trace == -1)
112 return 0;
113
114 *item = set->list[set->trace].val;
115 set->trace = set->list[set->trace].alloc_next;
116
117 return 1;
118}
119
120int via_setDestroy(set_t * set)
121{
122 drm_free(set, sizeof(set_t), DRM_MEM_DRIVER);
123
124 return 1;
125}
126
127#define ISFREE(bptr) ((bptr)->free)
128
129#define fprintf(fmt, arg...) do{}while(0)
130
131memHeap_t *via_mmInit(int ofs, int size)
132{
133 PMemBlock blocks;
134
135 if (size <= 0)
136 return 0;
137
138 blocks = (TMemBlock *) drm_calloc(1, sizeof(TMemBlock), DRM_MEM_DRIVER);
139
140 if (blocks) {
141 blocks->ofs = ofs;
142 blocks->size = size;
143 blocks->free = 1;
144 return (memHeap_t *) blocks;
145 } else
146 return 0;
147}
148
149static TMemBlock *SliceBlock(TMemBlock * p,
150 int startofs, int size,
151 int reserved, int alignment)
152{
153 TMemBlock *newblock;
154
155 /* break left */
156 if (startofs > p->ofs) {
157 newblock =
158 (TMemBlock *) drm_calloc(1, sizeof(TMemBlock),
159 DRM_MEM_DRIVER);
160 newblock->ofs = startofs;
161 newblock->size = p->size - (startofs - p->ofs);
162 newblock->free = 1;
163 newblock->next = p->next;
164 p->size -= newblock->size;
165 p->next = newblock;
166 p = newblock;
167 }
168
169 /* break right */
170 if (size < p->size) {
171 newblock =
172 (TMemBlock *) drm_calloc(1, sizeof(TMemBlock),
173 DRM_MEM_DRIVER);
174 newblock->ofs = startofs + size;
175 newblock->size = p->size - size;
176 newblock->free = 1;
177 newblock->next = p->next;
178 p->size = size;
179 p->next = newblock;
180 }
181
182 /* p = middle block */
183 p->align = alignment;
184 p->free = 0;
185 p->reserved = reserved;
186 return p;
187}
188
189PMemBlock via_mmAllocMem(memHeap_t * heap, int size, int align2,
190 int startSearch)
191{
192 int mask, startofs, endofs;
193 TMemBlock *p;
194
195 if (!heap || align2 < 0 || size <= 0)
196 return NULL;
197
198 mask = (1 << align2) - 1;
199 startofs = 0;
200 p = (TMemBlock *) heap;
201
202 while (p) {
203 if (ISFREE(p)) {
204 startofs = (p->ofs + mask) & ~mask;
205
206 if (startofs < startSearch)
207 startofs = startSearch;
208
209 endofs = startofs + size;
210
211 if (endofs <= (p->ofs + p->size))
212 break;
213 }
214
215 p = p->next;
216 }
217
218 if (!p)
219 return NULL;
220
221 p = SliceBlock(p, startofs, size, 0, mask + 1);
222 p->heap = heap;
223
224 return p;
225}
226
227static __inline__ int Join2Blocks(TMemBlock * p)
228{
229 if (p->free && p->next && p->next->free) {
230 TMemBlock *q = p->next;
231 p->size += q->size;
232 p->next = q->next;
233 drm_free(q, sizeof(TMemBlock), DRM_MEM_DRIVER);
234
235 return 1;
236 }
237
238 return 0;
239}
240
241int via_mmFreeMem(PMemBlock b)
242{
243 TMemBlock *p, *prev;
244
245 if (!b)
246 return 0;
247
248 if (!b->heap) {
249 fprintf(stderr, "no heap\n");
250
251 return -1;
252 }
253
254 p = b->heap;
255 prev = NULL;
256
257 while (p && p != b) {
258 prev = p;
259 p = p->next;
260 }
261
262 if (!p || p->free || p->reserved) {
263 if (!p)
264 fprintf(stderr, "block not found in heap\n");
265 else if (p->free)
266 fprintf(stderr, "block already free\n");
267 else
268 fprintf(stderr, "block is reserved\n");
269
270 return -1;
271 }
272
273 p->free = 1;
274 Join2Blocks(p);
275
276 if (prev)
277 Join2Blocks(prev);
278
279 return 0;
280}
generated by cgit v1.2.2 (git 2.25.0) at 2026-05-02 22:30:52 -0400