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
19 #include "assert_support.h"
20 #include "platform_support.h"
21 #include "ia_css_isys.h"
22 #include "bitop_support.h"
23 #include "isys_dma_rmgr.h"
24
25 static isys_dma_rsrc_t isys_dma_rsrc[N_ISYS2401_DMA_ID];
26
ia_css_isys_dma_channel_rmgr_init(void)27 void ia_css_isys_dma_channel_rmgr_init(void)
28 {
29 memset(&isys_dma_rsrc, 0, sizeof(isys_dma_rsrc_t));
30 }
31
ia_css_isys_dma_channel_rmgr_uninit(void)32 void ia_css_isys_dma_channel_rmgr_uninit(void)
33 {
34 memset(&isys_dma_rsrc, 0, sizeof(isys_dma_rsrc_t));
35 }
36
ia_css_isys_dma_channel_rmgr_acquire(isys2401_dma_ID_t dma_id,isys2401_dma_channel * channel)37 bool ia_css_isys_dma_channel_rmgr_acquire(
38 isys2401_dma_ID_t dma_id,
39 isys2401_dma_channel *channel)
40 {
41 bool retval = false;
42 isys2401_dma_channel i;
43 isys2401_dma_channel max_dma_channel;
44 isys_dma_rsrc_t *cur_rsrc = NULL;
45
46 assert(dma_id < N_ISYS2401_DMA_ID);
47 assert(channel);
48
49 max_dma_channel = N_ISYS2401_DMA_CHANNEL_PROCS[dma_id];
50 cur_rsrc = &isys_dma_rsrc[dma_id];
51
52 if (cur_rsrc->num_active < max_dma_channel) {
53 for (i = ISYS2401_DMA_CHANNEL_0; i < N_ISYS2401_DMA_CHANNEL; i++) {
54 if (bitop_getbit(cur_rsrc->active_table, i) == 0) {
55 bitop_setbit(cur_rsrc->active_table, i);
56 *channel = i;
57 cur_rsrc->num_active++;
58 retval = true;
59 break;
60 }
61 }
62 }
63
64 return retval;
65 }
66
ia_css_isys_dma_channel_rmgr_release(isys2401_dma_ID_t dma_id,isys2401_dma_channel * channel)67 void ia_css_isys_dma_channel_rmgr_release(
68 isys2401_dma_ID_t dma_id,
69 isys2401_dma_channel *channel)
70 {
71 isys2401_dma_channel max_dma_channel;
72 isys_dma_rsrc_t *cur_rsrc = NULL;
73
74 assert(dma_id < N_ISYS2401_DMA_ID);
75 assert(channel);
76
77 max_dma_channel = N_ISYS2401_DMA_CHANNEL_PROCS[dma_id];
78 cur_rsrc = &isys_dma_rsrc[dma_id];
79
80 if ((*channel < max_dma_channel) && (cur_rsrc->num_active > 0)) {
81 if (bitop_getbit(cur_rsrc->active_table, *channel) == 1) {
82 bitop_clearbit(cur_rsrc->active_table, *channel);
83 cur_rsrc->num_active--;
84 }
85 }
86 }
87