1 /**
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 */
26 static int
get_resource(u8 * rscs,unsigned int amount,unsigned int multi,unsigned int * ridx)27 get_resource(u8 *rscs, unsigned int amount,
28 unsigned int multi, unsigned int *ridx)
29 {
30 int i, j, k, n;
31
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
put_resource(u8 * rscs,unsigned int multi,unsigned int idx)62 static int put_resource(u8 *rscs, unsigned int multi, unsigned int idx)
63 {
64 unsigned int i, j, k, n;
65
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
mgr_get_resource(struct rsc_mgr * mgr,unsigned int n,unsigned int * ridx)77 int mgr_get_resource(struct rsc_mgr *mgr, unsigned int n, unsigned int *ridx)
78 {
79 int err;
80
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
mgr_put_resource(struct rsc_mgr * mgr,unsigned int n,unsigned int idx)91 int 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
99 static 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
rsc_index(const struct rsc * rsc)106 static int rsc_index(const struct rsc *rsc)
107 {
108 return rsc->conj;
109 }
110
audio_ring_slot(const struct rsc * rsc)111 static int audio_ring_slot(const struct rsc *rsc)
112 {
113 return (rsc->conj << 4) + offset_in_audio_slot_block[rsc->type];
114 }
115
rsc_next_conj(struct rsc * rsc)116 static 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
rsc_master(struct rsc * rsc)125 static int rsc_master(struct rsc *rsc)
126 {
127 return rsc->conj = rsc->idx;
128 }
129
130 static 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
rsc_init(struct rsc * rsc,u32 idx,enum RSCTYP type,u32 msr,void * hw)137 int 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;
147 if (!hw) {
148 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:
165 printk(KERN_ERR
166 "ctxfi: Invalid resource type value %d!\n", type);
167 return -EINVAL;
168 }
169
170 if (err) {
171 printk(KERN_ERR
172 "ctxfi: Failed to get resource control block!\n");
173 return err;
174 }
175
176 return 0;
177 }
178
rsc_uninit(struct rsc * rsc)179 int 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:
195 printk(KERN_ERR "ctxfi: "
196 "Invalid resource type value %d!\n", rsc->type);
197 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
rsc_mgr_init(struct rsc_mgr * mgr,enum RSCTYP type,unsigned int amount,void * hw_obj)210 int 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);
219 if (!mgr->rscs)
220 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:
238 printk(KERN_ERR
239 "ctxfi: Invalid resource type value %d!\n", type);
240 err = -EINVAL;
241 goto error;
242 }
243
244 if (err) {
245 printk(KERN_ERR
246 "ctxfi: Failed to get manager control block!\n");
247 goto error;
248 }
249
250 mgr->type = type;
251 mgr->avail = mgr->amount = amount;
252 mgr->hw = hw;
253
254 return 0;
255
256 error:
257 kfree(mgr->rscs);
258 return err;
259 }
260
rsc_mgr_uninit(struct rsc_mgr * mgr)261 int 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:
289 printk(KERN_ERR "ctxfi: "
290 "Invalid resource type value %d!\n", mgr->type);
291 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 }
302