1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Support for Intel Camera Imaging ISP subsystem.
4 * Copyright (c) 2010 - 2015, Intel Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 */
15
16 #include "system_global.h"
17
18 #ifdef ISP2401
19
20 #include "assert_support.h"
21 #include "platform_support.h"
22 #include "ia_css_isys.h"
23 #include "bitop_support.h"
24 #include "isys_dma_rmgr.h"
25
26 static isys_dma_rsrc_t isys_dma_rsrc[N_ISYS2401_DMA_ID];
27
ia_css_isys_dma_channel_rmgr_init(void)28 void ia_css_isys_dma_channel_rmgr_init(void)
29 {
30 memset(&isys_dma_rsrc, 0, sizeof(isys_dma_rsrc_t));
31 }
32
ia_css_isys_dma_channel_rmgr_uninit(void)33 void ia_css_isys_dma_channel_rmgr_uninit(void)
34 {
35 memset(&isys_dma_rsrc, 0, sizeof(isys_dma_rsrc_t));
36 }
37
ia_css_isys_dma_channel_rmgr_acquire(isys2401_dma_ID_t dma_id,isys2401_dma_channel * channel)38 bool ia_css_isys_dma_channel_rmgr_acquire(
39 isys2401_dma_ID_t dma_id,
40 isys2401_dma_channel *channel)
41 {
42 bool retval = false;
43 isys2401_dma_channel i;
44 isys2401_dma_channel max_dma_channel;
45 isys_dma_rsrc_t *cur_rsrc = NULL;
46
47 assert(dma_id < N_ISYS2401_DMA_ID);
48 assert(channel);
49
50 max_dma_channel = N_ISYS2401_DMA_CHANNEL_PROCS[dma_id];
51 cur_rsrc = &isys_dma_rsrc[dma_id];
52
53 if (cur_rsrc->num_active < max_dma_channel) {
54 for (i = ISYS2401_DMA_CHANNEL_0; i < N_ISYS2401_DMA_CHANNEL; i++) {
55 if (bitop_getbit(cur_rsrc->active_table, i) == 0) {
56 bitop_setbit(cur_rsrc->active_table, i);
57 *channel = i;
58 cur_rsrc->num_active++;
59 retval = true;
60 break;
61 }
62 }
63 }
64
65 return retval;
66 }
67
ia_css_isys_dma_channel_rmgr_release(isys2401_dma_ID_t dma_id,isys2401_dma_channel * channel)68 void ia_css_isys_dma_channel_rmgr_release(
69 isys2401_dma_ID_t dma_id,
70 isys2401_dma_channel *channel)
71 {
72 isys2401_dma_channel max_dma_channel;
73 isys_dma_rsrc_t *cur_rsrc = NULL;
74
75 assert(dma_id < N_ISYS2401_DMA_ID);
76 assert(channel);
77
78 max_dma_channel = N_ISYS2401_DMA_CHANNEL_PROCS[dma_id];
79 cur_rsrc = &isys_dma_rsrc[dma_id];
80
81 if ((*channel < max_dma_channel) && (cur_rsrc->num_active > 0)) {
82 if (bitop_getbit(cur_rsrc->active_table, *channel) == 1) {
83 bitop_clearbit(cur_rsrc->active_table, *channel);
84 cur_rsrc->num_active--;
85 }
86 }
87 }
88 #endif
89