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Wai Yew CHAY8cc72362009-05-14 08:05:58 +02001/**
2 * Copyright (C) 2008, Creative Technology Ltd. All Rights Reserved.
3 *
4 * This source file is released under GPL v2 license (no other versions).
5 * See the COPYING file included in the main directory of this source
6 * distribution for the license terms and conditions.
7 *
8 * @File ctresource.c
9 *
10 * @Brief
11 * This file contains the implementation of some generic helper functions.
12 *
13 * @Author Liu Chun
14 * @Date May 15 2008
15 *
16 */
17
18#include "ctresource.h"
19#include "cthardware.h"
20#include <linux/err.h>
21#include <linux/slab.h>
22
23#define AUDIO_SLOT_BLOCK_NUM 256
24
25/* Resource allocation based on bit-map management mechanism */
26static int
27get_resource(u8 *rscs, unsigned int amount,
28 unsigned int multi, unsigned int *ridx)
29{
Takashi Iwai514eef92009-06-08 14:57:57 +020030 int i, j, k, n;
Wai Yew CHAY8cc72362009-05-14 08:05:58 +020031
32 /* Check whether there are sufficient resources to meet request. */
33 for (i = 0, n = multi; i < amount; i++) {
34 j = i / 8;
35 k = i % 8;
36 if (rscs[j] & ((u8)1 << k)) {
37 n = multi;
38 continue;
39 }
40 if (!(--n))
41 break; /* found sufficient contiguous resources */
42 }
43
44 if (i >= amount) {
45 /* Can not find sufficient contiguous resources */
46 return -ENOENT;
47 }
48
49 /* Mark the contiguous bits in resource bit-map as used */
50 for (n = multi; n > 0; n--) {
51 j = i / 8;
52 k = i % 8;
53 rscs[j] |= ((u8)1 << k);
54 i--;
55 }
56
57 *ridx = i + 1;
58
59 return 0;
60}
61
62static int put_resource(u8 *rscs, unsigned int multi, unsigned int idx)
63{
Takashi Iwai514eef92009-06-08 14:57:57 +020064 unsigned int i, j, k, n;
Wai Yew CHAY8cc72362009-05-14 08:05:58 +020065
66 /* Mark the contiguous bits in resource bit-map as used */
67 for (n = multi, i = idx; n > 0; n--) {
68 j = i / 8;
69 k = i % 8;
70 rscs[j] &= ~((u8)1 << k);
71 i++;
72 }
73
74 return 0;
75}
76
77int mgr_get_resource(struct rsc_mgr *mgr, unsigned int n, unsigned int *ridx)
78{
Takashi Iwai514eef92009-06-08 14:57:57 +020079 int err;
Wai Yew CHAY8cc72362009-05-14 08:05:58 +020080
81 if (n > mgr->avail)
82 return -ENOENT;
83
84 err = get_resource(mgr->rscs, mgr->amount, n, ridx);
85 if (!err)
86 mgr->avail -= n;
87
88 return err;
89}
90
91int mgr_put_resource(struct rsc_mgr *mgr, unsigned int n, unsigned int idx)
92{
93 put_resource(mgr->rscs, n, idx);
94 mgr->avail += n;
95
96 return 0;
97}
98
99static unsigned char offset_in_audio_slot_block[NUM_RSCTYP] = {
100 /* SRC channel is at Audio Ring slot 1 every 16 slots. */
101 [SRC] = 0x1,
102 [AMIXER] = 0x4,
103 [SUM] = 0xc,
104};
105
106static int rsc_index(const struct rsc *rsc)
107{
108 return rsc->conj;
109}
110
111static int audio_ring_slot(const struct rsc *rsc)
112{
113 return (rsc->conj << 4) + offset_in_audio_slot_block[rsc->type];
114}
115
116static int rsc_next_conj(struct rsc *rsc)
117{
118 unsigned int i;
119 for (i = 0; (i < 8) && (!(rsc->msr & (0x1 << i))); )
120 i++;
121 rsc->conj += (AUDIO_SLOT_BLOCK_NUM >> i);
122 return rsc->conj;
123}
124
125static int rsc_master(struct rsc *rsc)
126{
127 return rsc->conj = rsc->idx;
128}
129
130static struct rsc_ops rsc_generic_ops = {
131 .index = rsc_index,
132 .output_slot = audio_ring_slot,
133 .master = rsc_master,
134 .next_conj = rsc_next_conj,
135};
136
137int rsc_init(struct rsc *rsc, u32 idx, enum RSCTYP type, u32 msr, void *hw)
138{
139 int err = 0;
140
141 rsc->idx = idx;
142 rsc->conj = idx;
143 rsc->type = type;
144 rsc->msr = msr;
145 rsc->hw = hw;
146 rsc->ops = &rsc_generic_ops;
Takashi Iwai35ebf6e2009-07-22 17:12:34 +0200147 if (!hw) {
Wai Yew CHAY8cc72362009-05-14 08:05:58 +0200148 rsc->ctrl_blk = NULL;
149 return 0;
150 }
151
152 switch (type) {
153 case SRC:
154 err = ((struct hw *)hw)->src_rsc_get_ctrl_blk(&rsc->ctrl_blk);
155 break;
156 case AMIXER:
157 err = ((struct hw *)hw)->
158 amixer_rsc_get_ctrl_blk(&rsc->ctrl_blk);
159 break;
160 case SRCIMP:
161 case SUM:
162 case DAIO:
163 break;
164 default:
Takashi Iwaib3e0afe2009-05-14 15:19:30 +0200165 printk(KERN_ERR
166 "ctxfi: Invalid resource type value %d!\n", type);
Wai Yew CHAY8cc72362009-05-14 08:05:58 +0200167 return -EINVAL;
168 }
169
170 if (err) {
Takashi Iwaib3e0afe2009-05-14 15:19:30 +0200171 printk(KERN_ERR
172 "ctxfi: Failed to get resource control block!\n");
Wai Yew CHAY8cc72362009-05-14 08:05:58 +0200173 return err;
174 }
175
176 return 0;
177}
178
179int rsc_uninit(struct rsc *rsc)
180{
181 if ((NULL != rsc->hw) && (NULL != rsc->ctrl_blk)) {
182 switch (rsc->type) {
183 case SRC:
184 ((struct hw *)rsc->hw)->
185 src_rsc_put_ctrl_blk(rsc->ctrl_blk);
186 break;
187 case AMIXER:
188 ((struct hw *)rsc->hw)->
189 amixer_rsc_put_ctrl_blk(rsc->ctrl_blk);
190 break;
191 case SUM:
192 case DAIO:
193 break;
194 default:
Takashi Iwaib3e0afe2009-05-14 15:19:30 +0200195 printk(KERN_ERR "ctxfi: "
196 "Invalid resource type value %d!\n", rsc->type);
Wai Yew CHAY8cc72362009-05-14 08:05:58 +0200197 break;
198 }
199
200 rsc->hw = rsc->ctrl_blk = NULL;
201 }
202
203 rsc->idx = rsc->conj = 0;
204 rsc->type = NUM_RSCTYP;
205 rsc->msr = 0;
206
207 return 0;
208}
209
210int rsc_mgr_init(struct rsc_mgr *mgr, enum RSCTYP type,
211 unsigned int amount, void *hw_obj)
212{
213 int err = 0;
214 struct hw *hw = hw_obj;
215
216 mgr->type = NUM_RSCTYP;
217
218 mgr->rscs = kzalloc(((amount + 8 - 1) / 8), GFP_KERNEL);
Takashi Iwai35ebf6e2009-07-22 17:12:34 +0200219 if (!mgr->rscs)
Wai Yew CHAY8cc72362009-05-14 08:05:58 +0200220 return -ENOMEM;
221
222 switch (type) {
223 case SRC:
224 err = hw->src_mgr_get_ctrl_blk(&mgr->ctrl_blk);
225 break;
226 case SRCIMP:
227 err = hw->srcimp_mgr_get_ctrl_blk(&mgr->ctrl_blk);
228 break;
229 case AMIXER:
230 err = hw->amixer_mgr_get_ctrl_blk(&mgr->ctrl_blk);
231 break;
232 case DAIO:
233 err = hw->daio_mgr_get_ctrl_blk(hw, &mgr->ctrl_blk);
234 break;
235 case SUM:
236 break;
237 default:
Takashi Iwaib3e0afe2009-05-14 15:19:30 +0200238 printk(KERN_ERR
239 "ctxfi: Invalid resource type value %d!\n", type);
Wai Yew CHAY8cc72362009-05-14 08:05:58 +0200240 err = -EINVAL;
241 goto error;
242 }
243
244 if (err) {
Takashi Iwaib3e0afe2009-05-14 15:19:30 +0200245 printk(KERN_ERR
246 "ctxfi: Failed to get manager control block!\n");
Wai Yew CHAY8cc72362009-05-14 08:05:58 +0200247 goto error;
248 }
249
250 mgr->type = type;
251 mgr->avail = mgr->amount = amount;
252 mgr->hw = hw;
253
254 return 0;
255
256error:
257 kfree(mgr->rscs);
258 return err;
259}
260
261int rsc_mgr_uninit(struct rsc_mgr *mgr)
262{
263 if (NULL != mgr->rscs) {
264 kfree(mgr->rscs);
265 mgr->rscs = NULL;
266 }
267
268 if ((NULL != mgr->hw) && (NULL != mgr->ctrl_blk)) {
269 switch (mgr->type) {
270 case SRC:
271 ((struct hw *)mgr->hw)->
272 src_mgr_put_ctrl_blk(mgr->ctrl_blk);
273 break;
274 case SRCIMP:
275 ((struct hw *)mgr->hw)->
276 srcimp_mgr_put_ctrl_blk(mgr->ctrl_blk);
277 break;
278 case AMIXER:
279 ((struct hw *)mgr->hw)->
280 amixer_mgr_put_ctrl_blk(mgr->ctrl_blk);
281 break;
282 case DAIO:
283 ((struct hw *)mgr->hw)->
284 daio_mgr_put_ctrl_blk(mgr->ctrl_blk);
285 break;
286 case SUM:
287 break;
288 default:
Takashi Iwaib3e0afe2009-05-14 15:19:30 +0200289 printk(KERN_ERR "ctxfi: "
290 "Invalid resource type value %d!\n", mgr->type);
Wai Yew CHAY8cc72362009-05-14 08:05:58 +0200291 break;
292 }
293
294 mgr->hw = mgr->ctrl_blk = NULL;
295 }
296
297 mgr->type = NUM_RSCTYP;
298 mgr->avail = mgr->amount = 0;
299
300 return 0;
301}